Sample records for fe model part

  1. A Structural Molar Volume Model for Oxide Melts Part III: Fe Oxide-Containing Melts

    NASA Astrophysics Data System (ADS)

    Thibodeau, Eric; Gheribi, Aimen E.; Jung, In-Ho

    2016-04-01

    As part III of this series, the model is extended to iron oxide-containing melts. All available experimental data in the FeO-Fe2O3-Na2O-K2O-MgO-CaO-MnO-Al2O3-SiO2 system were critically evaluated based on the experimental condition. The variations of FeO and Fe2O3 in the melts were taken into account by using FactSage to calculate the Fe2+/Fe3+ distribution. The molar volume model with unary and binary model parameters can be used to predict the molar volume of the molten oxide of the Li2O-Na2O-K2O-MgO-CaO-MnO-PbO-FeO-Fe2O3-Al2O3-SiO2 system in the entire range of compositions, temperatures, and oxygen partial pressures from Fe saturation to 1 atm pressure.

  2. Santa Fe Community College Part-Time Faculty Professional Development Plan.

    ERIC Educational Resources Information Center

    Santa Fe Community Coll., NM.

    Developed for faculty employed on a part-time basis at Santa Fe Community College (SFCC), this booklet explains the required and optional activities comprising the college's professional development program. Introductory sections reveal that part-time faculty members are required to participate in a number of professional development activities,…

  3. Elastic and Piezoelectric Properties of Boron Nitride Nanotube Composites. Part II; Finite Element Model

    NASA Technical Reports Server (NTRS)

    Kim, H. Alicia; Hardie, Robert; Yamakov, Vesselin; Park, Cheol

    2015-01-01

    This paper is the second part of a two-part series where the first part presents a molecular dynamics model of a single Boron Nitride Nanotube (BNNT) and this paper scales up to multiple BNNTs in a polymer matrix. This paper presents finite element (FE) models to investigate the effective elastic and piezoelectric properties of (BNNT) nanocomposites. The nanocomposites studied in this paper are thin films of polymer matrix with aligned co-planar BNNTs. The FE modelling approach provides a computationally efficient way to gain an understanding of the material properties. We examine several FE models to identify the most suitable models and investigate the effective properties with respect to the BNNT volume fraction and the number of nanotube walls. The FE models are constructed to represent aligned and randomly distributed BNNTs in a matrix of resin using 2D and 3D hollow and 3D filled cylinders. The homogenisation approach is employed to determine the overall elastic and piezoelectric constants for a range of volume fractions. These models are compared with an analytical model based on Mori-Tanaka formulation suitable for finite length cylindrical inclusions. The model applies to primarily single-wall BNNTs but is also extended to multi-wall BNNTs, for which preliminary results will be presented. Results from the Part 1 of this series can help to establish a constitutive relationship for input into the finite element model to enable the modeling of multiple BNNTs in a polymer matrix.

  4. Comparison of Ab initio Low-Energy Models for LaFePO, LaFeAsO, BaFe2As2, LiFeAs, FeSe, and FeTe

    NASA Astrophysics Data System (ADS)

    Nakamura, Kazuma; Miyake, Takashi; Arita, Ryotaro; Imada, Masatoshi

    2010-03-01

    We present effective low-energy models for LaFePO and LaFeAsO (1111 family), BaFe2As2 (122), LiFeAs (111), and FeSe and FeTe (11) [1], based on ab initio downfolding scheme, a constrained random-phase-approximation method combined with maximally localized Wannier functions. Comparison among the effective models, derived for 5 Fe-3d bands, provides a basis for interpreting physics/chemistry; material dependences of electron correlations, a multiband character entangled by the 3d orbitals, and the geometrical frustration depending on hybridizations between iron and pnictogen/chalcogen orbitals. We found that LaFePO in the 1111 family resides in the weak correlation regime, while LaFeAsO and 111/122 compounds are the intermediate region and FeSe and FeTe in the 11 family are located in the strong correlation regime. A principal parameter relevant to the physics is clarified to be the pnictogen/chalcogen height from the iron layer. Implications in low-energy properties including magnetism and superconductivity are discussed. [1] T. Miyake, K. Nakamura, R. Arita, and M. Imada, arXiv:0911.3705.

  5. Modeling and characterization of as-welded microstructure of solid solution strengthened Ni-Cr-Fe alloys resistant to ductility-dip cracking part I: Numerical modeling

    NASA Astrophysics Data System (ADS)

    Unfried-Silgado, Jimy; Ramirez, Antonio J.

    2014-03-01

    This work aims the numerical modeling and characterization of as-welded microstructure of Ni-Cr-Fe alloys with additions of Nb, Mo and Hf as a key to understand their proven resistance to ductility-dip cracking. Part I deals with as-welded structure modeling, using experimental alloying ranges and Calphad methodology. Model calculates kinetic phase transformations and partitioning of elements during weld solidification using a cooling rate of 100 K.s-1, considering their consequences on solidification mode for each alloy. Calculated structures were compared with experimental observations on as-welded structures, exhibiting good agreement. Numerical calculations estimate an increase by three times of mass fraction of primary carbides precipitation, a substantial reduction of mass fraction of M23C6 precipitates and topologically closed packed phases (TCP), a homogeneously intradendritic distribution, and a slight increase of interdendritic Molybdenum distribution in these alloys. Incidences of metallurgical characteristics of modeled as-welded structures on desirable characteristics of Ni-based alloys resistant to DDC are discussed here.

  6. A physics-based crystallographic modeling framework for describing the thermal creep behavior of Fe-Cr alloys

    DOE Office of Scientific and Technical Information (OSTI.GOV)

    Wen, Wei; Capolungo, Laurent; Patra, Anirban

    This Report addresses the Milestone M2MS-16LA0501032 of NEAMS Program (“Develop hardening model for FeCrAl cladding), with a deadline of 09/30/2016. Here we report a constitutive law for thermal creep of FeCrAl. This Report adds to and complements the one for Milestone M3MS-16LA0501034 (“Interface hardening models with MOOSE-BISON”), where we presented a hardening law for irradiated FeCrAl. The last component of our polycrystal-based constitutive behavior, namely, an irradiation creep model for FeCrAl, will be developed as part of the FY17 Milestones, and the three regimes will be coupled and interfaced with MOOSE-BISON.

  7. Formation mechanisms of neutral Fe layers in the thermosphere at Antarctica studied with a thermosphere-ionosphere Fe/Fe+ (TIFe) model

    NASA Astrophysics Data System (ADS)

    Chu, Xinzhao; Yu, Zhibin

    2017-06-01

    With a thermosphere-ionosphere Fe/Fe+ (TIFe) model developed from first principles at the University of Colorado, we present the first quantitative investigation of formation mechanisms of thermospheric Fe layers observed by lidar in Antarctica. These recently discovered neutral metal layers in the thermosphere between 100 and 200 km provide unique tracers for studies of fundamental processes in the space-atmosphere interaction region. The TIFe model formulates and expands the TIFe theory originally proposed by Chu et al. that the thermospheric Fe layers are produced through the neutralization of converged Fe+ layers. Through testing mechanisms and reproducing the 28 May 2011 event at McMurdo, we conceive the lifecycle of meteoric metals via deposition, transport, chemistry, and wave dynamics for thermospheric Fe layers with gravity wave signatures. While the meteor injection of iron species is negligible above 120 km, the polar electric field transports metallic ions Fe+ upward from their main deposition region into the E-F regions, providing the major source of Fe+ (and accordingly Fe) in the thermosphere. Atmospheric wave-induced vertical shears of vertical and horizontal winds converge Fe+ to form dense Fe+ layers. Direct electron-Fe+ recombination is the major channel to neutralize Fe+ layers to form Fe above 120 km. Fe layer shapes are determined by multiple factors of neutral winds, electric field, and aurora activity. Gravity-wave-induced vertical wind plays a key role in forming gravity-wave-shaped Fe layers. Aurora particle precipitation enhances Fe+ neutralization by increasing electron density while accelerating Fe loss via charge transfer with enhanced NO+ and O2+ densities.Plain Language SummaryThe discoveries of neutral metal layers reaching near 200 km in the thermosphere have significant scientific merit because such discoveries challenge the current understandings of upper atmospheric composition</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26126995','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26126995"><span>Statistical <span class="hlt">modeling</span> of the reactions <span class="hlt">Fe</span>(+) + N2O → <span class="hlt">Fe</span>O(+) + N2 and <span class="hlt">Fe</span>O(+) + CO → <span class="hlt">Fe</span>(+) + CO2.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Ushakov, Vladimir G; Troe, Jürgen; Johnson, Ryan S; Guo, Hua; Ard, Shaun G; Melko, Joshua J; Shuman, Nicholas S; Viggiano, Albert A</p> <p>2015-08-14</p> <p>The rates of the reactions <span class="hlt">Fe</span>(+) + N2O → <span class="hlt">Fe</span>O(+) + N2 and <span class="hlt">Fe</span>O(+) + CO → <span class="hlt">Fe</span>(+) + CO2 are <span class="hlt">modeled</span> by statistical rate theory accounting for energy- and angular momentum-specific rate constants for formation of the primary and secondary cationic adducts and their backward and forward reactions. The reactions are both suggested to proceed on sextet and quartet potential energy surfaces with efficient, but probably not complete, equilibration by spin-inversion of the populations of the sextet and quartet adducts. The influence of spin-inversion on the overall reaction rate is investigated. The differences of the two reaction rates mostly are due to different numbers of entrance states (atom + linear rotor or linear rotor + linear rotor, respectively). The reaction <span class="hlt">Fe</span>(+) + N2O was studied either with (6)<span class="hlt">Fe</span>(+) or with (4)<span class="hlt">Fe</span>(+) reactants. Differences in the rate constants of (6)<span class="hlt">Fe</span>(+) and (4)<span class="hlt">Fe</span>(+) reacting with N2O are attributed to different contributions from electronically excited potential energy surfaces, such as they originate from the open-electronic shell reactants.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014MMI....20..307U','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014MMI....20..307U"><span><span class="hlt">Modeling</span> and characterization of as-welded microstructure of solid solution strengthened Ni-Cr-<span class="hlt">Fe</span> alloys resistant to ductility-dip cracking <span class="hlt">Part</span> II: Microstructure characterization</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Unfried-Silgado, Jimy; Ramirez, Antonio J.</p> <p>2014-03-01</p> <p>In <span class="hlt">part</span> II of this work is evaluated the as-welded microstructure of Ni-Cr-<span class="hlt">Fe</span> alloys, which were selected and <span class="hlt">modeled</span> in <span class="hlt">part</span> I. Detailed characterization of primary and secondary precipitates, subgrain and grain structures, partitioning, and grain boundary morphology were developed. Microstructural characterization was carried out using optical microscopy, SEM, TEM, EBSD, and XEDS techniques. These results were analyzed and compared to <span class="hlt">modeling</span> results displaying a good agreement. The Hf additions produced the highest waviness of grain boundaries, which were related to distribution of Hf-rich carbonitrides. Experimental evidences about Mo distribution into crystal lattice have provided information about its possible role in ductility-dip cracking (DDC). Characterization results of studied alloys were analyzed and linked to their DDC resistance data aiming to establish relationships between as-welded microstructure and hot deformation performance. Wavy grain boundaries, primary carbides distribution, and strengthened crystal lattice are metallurgical characteristics related to high DDC resistance.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3010399','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3010399"><span>Role of the Azadithiolate Cofactor in <span class="hlt">Models</span> for the [<span class="hlt">FeFe</span>]-Hydrogenase: Novel Structures and Catalytic Implications</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Olsen, Matthew T.; Rauchfuss, Thomas B.; Wilson, Scott R.</p> <p>2010-01-01</p> <p>The report summarizes studies on the redox behavior of synthetic <span class="hlt">models</span> for the [<span class="hlt">FeFe</span>]-hydrogenases, consisting of diiron dithiolato carbonyl complexes bearing the amine cofactor and its N-benzyl derivative. Of specific interest are the causes of the low reactivity of oxidized <span class="hlt">models</span> toward H2, which contrasts with the high activity of these enzymes for H2 oxidation. The redox and acid-base properties of the <span class="hlt">model</span> complexes [<span class="hlt">Fe</span>2[(SCH2)2NR](CO)3(dppv)(PMe3)]+ ([2]+ for R = H and [2′]+ for R = CH2C6H5, dppv = cis-1,2-bis(diphenylphosphino)ethylene)) indicate that addition of H2 and followed by deprotonation are (i) endothermic for the mixed valence (<span class="hlt">Fe</span>IIFeI) state and (ii) exothermic for the diferrous (<span class="hlt">Fe</span>IIFeII) state. The diferrous state is shown to be unstable with respect to coordination of the amine to <span class="hlt">Fe</span>, a derivative of which was characterized crystallographically. The redox and acid-base properties for the mixed valence <span class="hlt">models</span> differ strongly for those containing the amine cofactor versus those derived from propanedithiolate. Protonation of [2′]+ induces disproportionation to a 1:1 mixture of the ammonium-<span class="hlt">Fe</span>IFeI and the dication [2′]2+ (<span class="hlt">Fe</span>IIFeII). This effect is consistent with substantial enhancement of the basicity of the amine in the <span class="hlt">Fe</span>IFeI state vs the <span class="hlt">Fe</span>IIFeI state. The <span class="hlt">Fe</span>IFeI ammonium compounds are rapid and efficient H-atom donors toward the nitroxyl compound TEMPO. The atom transfer is proposed to proceed via the hydride, as indicated by the reaction of [HFe2[(SCH2)2NH](CO)2(dppv)2]+ with TEMPO. Collectively, the results suggest that proton-coupled electron-transfer pathways should be considered for H2 activation by the [<span class="hlt">FeFe</span>]-hydrogenases. PMID:21114298</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015MMTA...46..190Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015MMTA...46..190Z"><span><span class="hlt">Model</span> <span class="hlt">Fe</span>-Al Steel with Exceptional Resistance to High Temperature Coarsening. <span class="hlt">Part</span> II: Experimental Validation and Applications</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhou, Tihe; Zhang, Peng; O'Malley, Ronald J.; Zurob, Hatem S.; Subramanian, Mani</p> <p>2015-01-01</p> <p>In order to achieve a fine uniform grain-size distribution using the process of thin slab casting and directing rolling (TSCDR), it is necessary to control the grain-size prior to the onset of thermomechanical processing. In the companion paper, <span class="hlt">Model</span> <span class="hlt">Fe</span>- Al Steel with Exceptional Resistance to High Temperature Coarsening. <span class="hlt">Part</span> I: Coarsening Mechanism and Particle Pinning Effects, a new steel composition which uses a small volume fraction of austenite particles to pin the growth of delta-ferrite grains at high temperature was proposed and grain growth was studied in reheated samples. This paper will focus on the development of a simple laboratory-scale setup to simulate thin-slab casting of the newly developed steel and demonstrate the potential for grain size control under industrial conditions. Steel bars with different diameters are briefly dipped into the molten steel to create a shell of solidified material. These are then cooled down to room temperature at different cooling rates. During cooling, the austenite particles nucleate along the delta-ferrite grain boundaries and greatly retard grain growth. With decreasing temperature, more austenite particles precipitate, and grain growth can be completely arrested in the holding furnace. Additional applications of the <span class="hlt">model</span> alloy are discussed including grain-size control in the heat affected zone in welds and grain-growth resistance at high temperature.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/28222002','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/28222002"><span>Friction Reduction through Ultrasonic Vibration <span class="hlt">Part</span> 1: <span class="hlt">Modelling</span> Intermittent Contact.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Vezzoli, Eric; Vidrih, Zlatko; Giamundo, Vincenzo; Lemaire-Semail, Betty; Giraud, Frederic; Rodic, Tomaz; Peric, Djordje; Adams, Michael</p> <p>2017-01-01</p> <p>Ultrasonic vibration is employed to modify the friction of a finger pad in way that induces haptic sensations. A combination of intermittent contact and squeeze film levitation has been previously proposed as the most probable mechanism. In this paper, in order to understand the underlying principles that govern friction modulation by intermittent contact, numerical <span class="hlt">models</span> based on finite element (<span class="hlt">FE</span>) analysis and also a spring-Coulombic slider are developed. The physical input parameters for the <span class="hlt">FE</span> <span class="hlt">model</span> are optimized by measuring the contact phase shift between a finger pad and a vibrating plate. The spring-slider <span class="hlt">model</span> assists in the interpretation of the <span class="hlt">FE</span> <span class="hlt">model</span> and leads to the identification of a dimensionless group that allows the calculated coefficient of friction to be approximately superimposed onto an exponential function of the dimensionless group. Thus, it is possible to rationalize the computed relative reduction in friction being (i) dependent on the vibrational amplitude, frequency, and the intrinsic coefficient of friction of the device, and the reciprocal of the exploration velocity, and (ii) independent of the applied normal force, and the shear and extensional elastic moduli of the finger skin provided that intermittent contact is sufficiently well developed. Experimental validation of the <span class="hlt">modelling</span> using real and artificial fingertips will be reported in <span class="hlt">part</span> 2 of this work, which supports the current <span class="hlt">modelling</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2006GeCoA..70.5842B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2006GeCoA..70.5842B"><span>Reduction of <span class="hlt">Fe</span>(III) colloids by Shewanella putrefaciens: A kinetic <span class="hlt">model</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Bonneville, Steeve; Behrends, Thilo; van Cappellen, Philippe; Hyacinthe, Christelle; Röling, Wilfred F. M.</p> <p>2006-12-01</p> <p>A kinetic <span class="hlt">model</span> for the microbial reduction of <span class="hlt">Fe</span>(III) oxyhydroxide colloids in the presence of excess electron donor is presented. The <span class="hlt">model</span> assumes a two-step mechanism: (1) attachment of <span class="hlt">Fe</span>(III) colloids to the cell surface and (2) reduction of <span class="hlt">Fe</span>(III) centers at the surface of attached colloids. The validity of the <span class="hlt">model</span> is tested using Shewanella putrefaciens and nanohematite as <span class="hlt">model</span> dissimilatory iron reducing bacteria and <span class="hlt">Fe</span>(III) colloidal particles, respectively. Attachment of nanohematite to the bacteria is formally described by a Langmuir isotherm. Initial iron reduction rates are shown to correlate linearly with the relative coverage of the cell surface by nanohematite particles, hence supporting a direct electron transfer from membrane-bound reductases to mineral particles attached to the cells. Using internally consistent parameter values for the maximum attachment capacity of <span class="hlt">Fe</span>(III) colloids to the cells, Mmax, the attachment constant, KP, and the first-order <span class="hlt">Fe</span>(III) reduction rate constant, k, the <span class="hlt">model</span> reproduces the initial reduction rates of a variety of fine-grained <span class="hlt">Fe</span>(III) oxyhydroxides by S. putrefaciens. The <span class="hlt">model</span> explains the observed dependency of the apparent <span class="hlt">Fe</span>(III) half-saturation constant, Km∗, on the solid to cell ratio, and it predicts that initial iron reduction rates exhibit saturation with respect to both the cell density and the abundance of the <span class="hlt">Fe</span>(III) oxyhydroxide substrate.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2025642','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2025642"><span>Atomic Resolution <span class="hlt">Modeling</span> of the Ferredoxin:[<span class="hlt">FeFe</span>] Hydrogenase Complex from Chlamydomonas reinhardtii</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Chang, Christopher H.; King, Paul W.; Ghirardi, Maria L.; Kim, Kwiseon</p> <p>2007-01-01</p> <p>The [<span class="hlt">FeFe</span>] hydrogenases HydA1 and HydA2 in the green alga Chlamydomonas reinhardtii catalyze the final reaction in a remarkable metabolic pathway allowing this photosynthetic organism to produce H2 from water in the chloroplast. A [2<span class="hlt">Fe</span>-2S] ferredoxin is a critical branch point in electron flow from Photosystem I toward a variety of metabolic fates, including proton reduction by hydrogenases. To better understand the binding determinants involved in ferredoxin:hydrogenase interactions, we have <span class="hlt">modeled</span> Chlamydomonas PetF1 and HydA2 based on amino-acid sequence homology, and produced two promising electron-transfer <span class="hlt">model</span> complexes by computational docking. To characterize these <span class="hlt">models</span>, quantitative free energy calculations at atomic resolution were carried out, and detailed analysis of the interprotein interactions undertaken. The protein complex <span class="hlt">model</span> we propose for ferredoxin:HydA2 interaction is energetically favored over the alternative candidate by 20 kcal/mol. This proposed <span class="hlt">model</span> of the electron-transfer complex between PetF1 and HydA2 permits a more detailed view of the molecular events leading up to H2 evolution, and suggests potential mutagenic strategies to modulate electron flow to HydA2. PMID:17660315</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/17660315','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/17660315"><span>Atomic resolution <span class="hlt">modeling</span> of the ferredoxin:[<span class="hlt">FeFe</span>] hydrogenase complex from Chlamydomonas reinhardtii.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Chang, Christopher H; King, Paul W; Ghirardi, Maria L; Kim, Kwiseon</p> <p>2007-11-01</p> <p>The [<span class="hlt">FeFe</span>] hydrogenases HydA1 and HydA2 in the green alga Chlamydomonas reinhardtii catalyze the final reaction in a remarkable metabolic pathway allowing this photosynthetic organism to produce H(2) from water in the chloroplast. A [2<span class="hlt">Fe</span>-2S] ferredoxin is a critical branch point in electron flow from Photosystem I toward a variety of metabolic fates, including proton reduction by hydrogenases. To better understand the binding determinants involved in ferredoxin:hydrogenase interactions, we have <span class="hlt">modeled</span> Chlamydomonas PetF1 and HydA2 based on amino-acid sequence homology, and produced two promising electron-transfer <span class="hlt">model</span> complexes by computational docking. To characterize these <span class="hlt">models</span>, quantitative free energy calculations at atomic resolution were carried out, and detailed analysis of the interprotein interactions undertaken. The protein complex <span class="hlt">model</span> we propose for ferredoxin:HydA2 interaction is energetically favored over the alternative candidate by 20 kcal/mol. This proposed <span class="hlt">model</span> of the electron-transfer complex between PetF1 and HydA2 permits a more detailed view of the molecular events leading up to H(2) evolution, and suggests potential mutagenic strategies to modulate electron flow to HydA2.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/23662901','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/23662901"><span>Carbonate-mediated <span class="hlt">Fe</span>(II) oxidation in the air-cathode fuel cell: a kinetic <span class="hlt">model</span> in terms of <span class="hlt">Fe</span>(II) speciation.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Song, Wei; Zhai, Lin-Feng; Cui, Yu-Zhi; Sun, Min; Jiang, Yuan</p> <p>2013-06-06</p> <p>Due to the high redox activity of <span class="hlt">Fe</span>(II) and its abundance in natural waters, the electro-oxidation of <span class="hlt">Fe</span>(II) can be found in many air-cathode fuel cell systems, such as acid mine drainage fuel cells and sediment microbial fuel cells. To deeply understand these iron-related systems, it is essential to elucidate the kinetics and mechanisms involved in the electro-oxidation of <span class="hlt">Fe</span>(II). This work aims to develop a kinetic <span class="hlt">model</span> that adequately describes the electro-oxidation process of <span class="hlt">Fe</span>(II) in air-cathode fuel cells. The speciation of <span class="hlt">Fe</span>(II) is incorporated into the <span class="hlt">model</span>, and contributions of individual <span class="hlt">Fe</span>(II) species to the overall <span class="hlt">Fe</span>(II) oxidation rate are quantitatively evaluated. The results show that the kinetic <span class="hlt">model</span> can accurately predict the electro-oxidation rate of <span class="hlt">Fe</span>(II) in air-cathode fuel cells. <span class="hlt">Fe</span>CO3, <span class="hlt">Fe</span>(OH)2, and <span class="hlt">Fe</span>(CO3)2(2-) are the most important species determining the electro-oxidation kinetics of <span class="hlt">Fe</span>(II). The <span class="hlt">Fe</span>(II) oxidation rate is primarily controlled by the oxidation of <span class="hlt">Fe</span>CO3 species at low pH, whereas at high pH <span class="hlt">Fe</span>(OH)2 and <span class="hlt">Fe</span>(CO3)2(2-) are the dominant species. Solution pH, carbonate concentration, and solution salinity are able to influence the electro-oxidation kinetics of <span class="hlt">Fe</span>(II) through changing both distribution and kinetic activity of <span class="hlt">Fe</span>(II) species.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/25461840','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/25461840"><span>[<span class="hlt">FeFe</span>]- and [Ni<span class="hlt">Fe</span>]-hydrogenase diversity, mechanism, and maturation.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Peters, John W; Schut, Gerrit J; Boyd, Eric S; Mulder, David W; Shepard, Eric M; Broderick, Joan B; King, Paul W; Adams, Michael W W</p> <p>2015-06-01</p> <p>The [<span class="hlt">FeFe</span>]- and [Ni<span class="hlt">Fe</span>]-hydrogenases catalyze the formal interconversion between hydrogen and protons and electrons, possess characteristic non-protein ligands at their catalytic sites and thus share common mechanistic features. Despite the similarities between these two types of hydrogenases, they clearly have distinct evolutionary origins and likely emerged from different selective pressures. [<span class="hlt">FeFe</span>]-hydrogenases are widely distributed in fermentative anaerobic microorganisms and likely evolved under selective pressure to couple hydrogen production to the recycling of electron carriers that accumulate during anaerobic metabolism. In contrast, many [Ni<span class="hlt">Fe</span>]-hydrogenases catalyze hydrogen oxidation as <span class="hlt">part</span> of energy metabolism and were likely key enzymes in early life and arguably represent the predecessors of modern respiratory metabolism. Although the reversible combination of protons and electrons to generate hydrogen gas is the simplest of chemical reactions, the [<span class="hlt">FeFe</span>]- and [Ni<span class="hlt">Fe</span>]-hydrogenases have distinct mechanisms and differ in the fundamental chemistry associated with proton transfer and control of electron flow that also help to define catalytic bias. A unifying feature of these enzymes is that hydrogen activation itself has been restricted to one solution involving diatomic ligands (carbon monoxide and cyanide) bound to an <span class="hlt">Fe</span> ion. On the other hand, and quite remarkably, the biosynthetic mechanisms to produce these ligands are exclusive to each type of enzyme. Furthermore, these mechanisms represent two independent solutions to the formation of complex bioinorganic active sites for catalyzing the simplest of chemical reactions, reversible hydrogen oxidation. As such, the [<span class="hlt">FeFe</span>]- and [Ni<span class="hlt">Fe</span>]-hydrogenases are arguably the most profound case of convergent evolution. This article is <span class="hlt">part</span> of a Special Issue entitled: <span class="hlt">Fe</span>/S proteins: Analysis, structure, function, biogenesis and diseases. Copyright © 2014 Elsevier B.V. All rights reserved.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1340645-identification-catalytic-iron-hydride-cluster-fefe-hydrogenase','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1340645-identification-catalytic-iron-hydride-cluster-fefe-hydrogenase"><span>Identification of a catalytic iron-hydride at the H-cluster of [<span class="hlt">FeFe</span>]-hydrogenase</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Mulder, David W.; Guo, Yisong; Ratzloff, Michael W.; ...</p> <p>2016-12-14</p> <p>Hydrogenases couple electrochemical potential to the reversible chemical transformation of H 2 and protons, yet the reaction mechanism and composition of intermediates are not fully understood. In this Communication we describe the biophysical properties of a hydride-bound state (H hyd) of the [<span class="hlt">FeFe</span>]-hydrogenase from Chlamydomonas reinhardtii. The catalytic H-cluster of [<span class="hlt">FeFe</span>]-hydrogenase consists of a [4<span class="hlt">Fe</span>-4S] subcluster ([4<span class="hlt">Fe</span>-4S] H) linked by a cysteine thiol to an azadithiolate-bridged 2<span class="hlt">Fe</span> subcluster ([2<span class="hlt">Fe</span>] H) with CO and CN- ligands. Mossbauer analysis and density functional theory (DFT) calculations show that H hyd consists of a reduced [4<span class="hlt">Fe</span>-4S] H + coupled to a diferrous [2<span class="hlt">Fe</span>] Hmore » with a terminally bound <span class="hlt">Fe</span>-hydride. The existence of the <span class="hlt">Fe</span>-hydride in Hhyd was demonstrated by an unusually low Mossbauer isomer shift of the distal <span class="hlt">Fe</span> of the [2<span class="hlt">Fe</span>] H subcluster. As a result, a DFT <span class="hlt">model</span> of H hyd shows that the <span class="hlt">Fe</span>-hydride is <span class="hlt">part</span> of a H-bonding network with the nearby bridging azadithiolate to facilitate fast proton exchange and catalytic turnover.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013AIPC.1532..183A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013AIPC.1532..183A"><span><span class="hlt">Modelling</span> of stamping of DP steel automotive <span class="hlt">part</span> accounting for the effect of hard components in the microstructure</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ambrozinski, Mateusz; Bzowski, Krzysztof; Mirek, Michal; Rauch, Lukasz; Pietrzyk, Maciej</p> <p>2013-05-01</p> <p>The paper presents simulations of the manufacturing of the automotive <span class="hlt">part</span>, which has high influence on improvement of passengers safety. Two approaches to the Finite Element (<span class="hlt">FE</span>) <span class="hlt">modelling</span> of stamping of a <span class="hlt">part</span> that provides extra stiffening of construction subassemblies in the back of a car were considered. The first is conventional simulation, which assumes that the material is a continuum with flow stress <span class="hlt">model</span> and anisotropy coefficients determined from the tensile tests. In the second approach two-phase microstructure of the DP steel is accounted for in simulations. The <span class="hlt">FE</span>2 method, which belongs to upscaling techniques, is used. Representative Volume Element (RVE), which is the basis of the upscaling approach and reflects the real microstructure, was obtained by the image analysis of the micrograph of the DP steel. However, since <span class="hlt">FE</span>2 simulations with the real picture of the microstructure in the micro scale, are extremely time consuming, the idea of the Statistically Similar Representative Volume Element (SSRVE) was applied. SSRVE obtained for the DP steel, used for production of automotive <span class="hlt">part</span>, is presented in the paper in the form of 3D inclusion. The macro scale <span class="hlt">model</span> of the simulated <span class="hlt">part</span> is described in details, as well as the results obtained for macro and micro-macro simulations.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2007AAS...210.2513B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2007AAS...210.2513B"><span>Measurement And <span class="hlt">Modeling</span> Of <span class="hlt">Fe</span> VIII To <span class="hlt">Fe</span> XVI M-shell Emission In The Extreme Ultraviolet</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Beiersdorfer, Peter; Lepson, J. K.; Hurwitz, M.</p> <p>2007-05-01</p> <p>The solar EUV emission near 200 Å is presently being studied with high resolution with the Cosmic Hot Interstellar Plasma Spectrometer (CHIPS), which focuses on the emission between 90 and 270 Å, and with the EUV Imaging Spectrometer on Hinode, which focuses on the region 180 to 204 Å and 250 to 290 Å. The Solar EUV Experiment on the TIMED spacecraft also observes this spectral band but with greatly reduced resolution. The spectrum in this region is dominated by emission from moderate charge states of iron. The interpretation of the data relies on accurate and complete plasma emission <span class="hlt">models</span>, notably CHIANTI. We have performed a series of laboratory measurements of the 3-3 emission from M-shell iron ions. The measurements cover the range 170 - 250 Å and are made at an electron density of about 1011 cm-3. Emission from <span class="hlt">Fe</span> VIII through <span class="hlt">Fe</span> XVI has been identified. Excellent agreement with CHIANTI predictions is found. A few weak transitions are noted in the laboratory data that are predicted by CHIANTI to be vanishingly small and should not have been observed. These are tentatively attributed to transitions in <span class="hlt">Fe</span> XV. A comparison with observations from CHIPS is also presented. This work was supported in <span class="hlt">part</span> by NASA's Solar and Heliospheric Physics Supporting Research and Technology Program. Work at UC-LLNL was performed under the auspices of the DOE by under Contract W-7405-Eng-48.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li class="active"><span>1</span></li> <li><a href="#" onclick='return showDiv("page_2");'>2</a></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_1 --> <div id="page_2" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_1");'>1</a></li> <li class="active"><span>2</span></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="21"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/servlets/purl/1376905','SCIGOV-STC'); return false;" href="https://www.osti.gov/servlets/purl/1376905"><span>Nuclear Energy Advanced <span class="hlt">Modeling</span> and Simulation (NEAMS) Accident Tolerant Fuels High Impact Problem: Coordinate Multiscale <span class="hlt">Fe</span>CrAl <span class="hlt">Modeling</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Gamble, K. A.; Hales, J. D.; Zhang, Y.</p> <p></p> <p>Since the events at the Fukushima-Daiichi nuclear power plant in March 2011 significant research has unfolded at national laboratories, universities and other institutions into alternative materials that have potential enhanced ac- cident tolerance when compared to traditional UO2 fuel zircaloy clad fuel rods. One of the potential replacement claddings are iron-chromium-alunimum (<span class="hlt">Fe</span>CrAl) alloys due to their increased oxidation resistance [1–4] and higher strength [1, 2]. While the oxidation characteristics of <span class="hlt">Fe</span>CrAl are a benefit for accident tolerance, the thermal neu- tron absorption cross section of <span class="hlt">Fe</span>CrAl is about ten times that of Zircaloy. This neutronic penalty necessitates thinner cladding. Thismore » allows for slightly larger pellets to give the same cold gap width in the rod. However, the slight increase in pellet diameter is not sufficient to compensate for the neutronic penalty and enriching the fuel beyond the current 5% limit appears to be necessary [5]. Current estimates indicate that this neutronic penalty will impose an increase in fuel cost of 15-35% [1, 2]. In addition to the neutronic disadvantage, it is anticipated that tritium release to the coolant will be larger because the permeability of hydrogen in <span class="hlt">Fe</span>CrAl is about 100 times higher than in Zircaloy [6]. Also, radiation-induced hardening and embrittlement of <span class="hlt">Fe</span>CrAl need to be fully characterized experimentally [7]. Due to the aggressive development schedule for inserting some of the potential materials into lead test assemblies or rods by 2022 [8] multiscale multiphysics <span class="hlt">modeling</span> approaches have been used to provide insight into these the use of <span class="hlt">Fe</span>CrAl as a cladding material. The purpose of this letter report is to highlight the multiscale <span class="hlt">modeling</span> effort for iron-chromium-alunimum (<span class="hlt">Fe</span>CrAl) cladding alloys as <span class="hlt">part</span> of the Nuclear Energy Advanced <span class="hlt">Modeling</span> and Simulation (NEAMS) program through its Accident Tolerant Fuel (ATF) High Impact Problem (HIP). The approach taken throughout the</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2008ApJ...675...83B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2008ApJ...675...83B"><span><span class="hlt">Modeling</span> <span class="hlt">Fe</span> II Emission and Revised <span class="hlt">Fe</span> II (UV) Empirical Templates for the Seyfert 1 Galaxy I Zw 1</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Bruhweiler, F.; Verner, E.</p> <p>2008-03-01</p> <p>We use the narrow-lined broad-line region (BLR) of the Seyfert 1 galaxy, I Zw 1, as a laboratory for <span class="hlt">modeling</span> the ultraviolet (UV) <span class="hlt">Fe</span> II 2100-3050 Å emission complex. We calculate a grid of <span class="hlt">Fe</span> II emission spectra representative of BLR clouds and compare them with the observed I Zw 1 spectrum. Our predicted spectrum for log [nH/(cm -3) ] = 11.0, log [ΦH/(cm -2 s-1) ] = 20.5, and ξ/(1 km s-1) = 20, using Cloudy and an 830 level <span class="hlt">model</span> atom for <span class="hlt">Fe</span> II with energies up to 14.06 eV, gives a better fit to the UV <span class="hlt">Fe</span> II emission than <span class="hlt">models</span> with fewer levels. Our analysis indicates (1) the observed UV <span class="hlt">Fe</span> II emission must be corrected for an underlying <span class="hlt">Fe</span> II pseudocontinuum; (2) <span class="hlt">Fe</span> II emission peaks can be misidentified as that of other ions in active galactic nuclei (AGNs) with narrow-lined BLRs possibly affecting deduced physical parameters; (3) the shape of 4200-4700 Å <span class="hlt">Fe</span> II emission in I Zw 1 and other AGNs is a relative indicator of narrow-line region (NLR) and BLR <span class="hlt">Fe</span> II emission; (4) predicted ratios of Lyα, C III], and <span class="hlt">Fe</span> II emission relative to Mg II λ2800 agree with extinction corrected observed I Zw 1 fluxes, except for C IV λ1549 (5) the sensitivity of <span class="hlt">Fe</span> II emission strength to microturbulence ξ casts doubt on existing relative <span class="hlt">Fe</span>/Mg abundances derived from <span class="hlt">Fe</span> II (UV)/Mg II flux ratios. Our calculated <span class="hlt">Fe</span> II emission spectra, suitable for BLRs in AGNs, are available at http://iacs.cua.edu/people/verner/<span class="hlt">Fe</span>II. Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 05-26555.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011JMEP...20..894L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011JMEP...20..894L"><span><span class="hlt">Modeling</span> and <span class="hlt">FE</span> Simulation of Quenchable High Strength Steels Sheet Metal Hot Forming Process</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Liu, Hongsheng; Bao, Jun; Xing, Zhongwen; Zhang, Dejin; Song, Baoyu; Lei, Chengxi</p> <p>2011-08-01</p> <p>High strength steel (HSS) sheet metal hot forming process is investigated by means of numerical simulations. With regard to a reliable numerical process design, the knowledge of the thermal and thermo-mechanical properties is essential. In this article, tensile tests are performed to examine the flow stress of the material HSS 22MnB5 at different strains, strain rates, and temperatures. Constitutive <span class="hlt">model</span> based on phenomenological approach is developed to describe the thermo-mechanical properties of the material 22MnB5 by fitting the experimental data. A 2D coupled thermo-mechanical finite element (<span class="hlt">FE</span>) <span class="hlt">model</span> is developed to simulate the HSS sheet metal hot forming process for U-channel <span class="hlt">part</span>. The ABAQUS/explicit <span class="hlt">model</span> is used conduct the hot forming stage simulations, and ABAQUS/implicit <span class="hlt">model</span> is used for accurately predicting the springback which happens at the end of hot forming stage. Material <span class="hlt">modeling</span> and <span class="hlt">FE</span> numerical simulations are carried out to investigate the effect of the processing parameters on the hot forming process. The processing parameters have significant influence on the microstructure of U-channel <span class="hlt">part</span>. The springback after hot forming stage is the main factor impairing the shape precision of hot-formed <span class="hlt">part</span>. The mechanism of springback is advanced and verified through numerical simulations and tensile loading-unloading tests. Creep strain is found in the tensile loading-unloading test under isothermal condition and has a distinct effect on springback. According to the numerical and experimental results, it can be concluded that springback is mainly caused by different cooling rats and the nonhomogengeous shrink of material during hot forming process, the creep strain is the main factor influencing the amount of the springback.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017JPhCS.896a2096S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017JPhCS.896a2096S"><span>Setup of a Parameterized <span class="hlt">FE</span> <span class="hlt">Model</span> for the Die Roll Prediction in Fine Blanking using Artificial Neural Networks</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Stanke, J.; Trauth, D.; Feuerhack, A.; Klocke, F.</p> <p>2017-09-01</p> <p>Die roll is a morphological feature of fine blanked sheared edges. The die roll reduces the functional <span class="hlt">part</span> of the sheared edge. To compensate for the die roll thicker sheet metal strips and secondary machining must be used. However, in order to avoid this, the influence of various fine blanking process parameters on the die roll has been experimentally and numerically studied, but there is still a lack of knowledge on the effects of some factors and especially factor interactions on the die roll. Recent changes in the field of artificial intelligence motivate the hybrid use of the finite element method and artificial neural networks to account for these non-considered parameters. Therefore, a set of simulations using a validated finite element <span class="hlt">model</span> of fine blanking is firstly used to train an artificial neural network. Then the artificial neural network is trained with thousands of experimental trials. Thus, the objective of this contribution is to develop an artificial neural network that reliably predicts the die roll. Therefore, in this contribution, the setup of a fully parameterized 2D <span class="hlt">FE</span> <span class="hlt">model</span> is presented that will be used for batch training of an artificial neural network. The <span class="hlt">FE</span> <span class="hlt">model</span> enables an automatic variation of the edge radii of blank punch and die plate, the counter and blank holder force, the sheet metal thickness and <span class="hlt">part</span> diameter, V-ring height and position, cutting velocity as well as material parameters covered by the Hensel-Spittel <span class="hlt">model</span> for 16MnCr5 (1.7131, AISI/SAE 5115). The <span class="hlt">FE</span> <span class="hlt">model</span> is validated using experimental trails. The results of this contribution is a <span class="hlt">FE</span> <span class="hlt">model</span> suitable to perform 9.623 simulations and to pass the simulated die roll width and height automatically to an artificial neural network.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017RJPCA..91.2593L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017RJPCA..91.2593L"><span>3D Computer <span class="hlt">Models</span> of T- x- y Diagrams, Forming the <span class="hlt">Fe-Ni-Co-Fe</span>S-NiS-CoS Subsystem</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Lutsyk, V. I.; Vorob'eva, V. P.</p> <p>2017-12-01</p> <p>3D computer <span class="hlt">models</span> of <span class="hlt">Fe</span>-Ni-Co, <span class="hlt">Fe-Ni-Fe</span>S-NiS, <span class="hlt">Fe-Co-Fe</span>S-CoS, Ni-Co-NiS-CoS T- x- y diagrams have been designed. The geometric structure (35 surfaces, two-phase surface of the reaction type change, 17 phase regions) of the <span class="hlt">Fe-Ni-Fe</span>S-NiS T- x- y diagram is investigated in detail. The liquidus hypersurfaces prediction of the <span class="hlt">Fe-Ni-Co-Fe</span>S-NiS-CoS subsystem is represented.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2006RaPC...75.1878B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2006RaPC...75.1878B"><span>XAFS of short-lived reduction products of structural and functional <span class="hlt">models</span> of the [<span class="hlt">Fe</span> <span class="hlt">Fe</span>] hydrogenase H-cluster</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Bondin, Mark I.; Borg, Stacey J.; Cheah, Mun-Hon; Best, Stephen P.</p> <p>2006-11-01</p> <p>Thiolate-bridged diiron compounds that are related to the active site of the [<span class="hlt">Fe-Fe</span>] hydrogenase enzyme have been shown to act as electrocatalysts for reduction of protons. The use of XAFS for clarification of the structures of intermediates formed following reduction of related diiron carbonyl compounds is described. These measurements allow the determination of <span class="hlt">Fe-Fe</span> and <span class="hlt">Fe</span>-S bond lengths with good reliability and when used in conjunction with the standard bonding <span class="hlt">models</span> this provides a means of validating the structures proposed for longer-lived ( t>20 s at -50 °C) reaction intermediates.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/servlets/purl/1364474','SCIGOV-STC'); return false;" href="https://www.osti.gov/servlets/purl/1364474"><span>Development and Validation of Accident <span class="hlt">Models</span> for <span class="hlt">Fe</span>CrAl Cladding</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Gamble, Kyle Allan Lawrence; Hales, Jason Dean</p> <p>2016-08-01</p> <p>The purpose of this milestone report is to present the work completed in regards to material <span class="hlt">model</span> development for <span class="hlt">Fe</span>CrAl cladding and highlight the results of applying these <span class="hlt">models</span> to Loss of Coolant Accidents (LOCA) and Station Blackouts (SBO). With the limited experimental data available (essentially only the data used to create the <span class="hlt">models</span>) true validation is not possible. In the absence of another alternative, qualitative comparisons during postulated accident scenarios between <span class="hlt">Fe</span>CrAl and Zircaloy-4 cladded rods have been completed demonstrating the superior performance of <span class="hlt">Fe</span>CrAl.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018E%26ES..140a2030A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018E%26ES..140a2030A"><span>Assessment of kinetic <span class="hlt">models</span> on <span class="hlt">Fe</span> adsorption in groundwater using high-quality limestone</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Akbar, N. A.; Kamil, N. A. F. Mohd; Zin, N. S. Md; Adlan, M. N.; Aziz, H. A.</p> <p>2018-04-01</p> <p>During the groundwater pumping process, dissolved <span class="hlt">Fe</span>2+ is oxidized into <span class="hlt">Fe</span>3+ and produce rust-coloured iron mineral. Adsorption kinetic <span class="hlt">models</span> are used to evaluate the performance of limestone adsorbent and describe the mechanism of adsorption and the diffusion processes of <span class="hlt">Fe</span> adsorption in groundwater. This work presents the best kinetic <span class="hlt">model</span> of <span class="hlt">Fe</span> adsorption, which was chosen based on a higher value of coefficient correlation, R2. A batch adsorption experiment was conducted for various contact times ranging from 0 to 135 minutes. From the results of the batch study, three kinetic <span class="hlt">models</span> were analyzed for <span class="hlt">Fe</span> removal onto limestone sorbent, including the pseudo-first order (PFO), pseudo-second order (PSO) and intra-particle diffusion (IPD) <span class="hlt">models</span>. Results show that the adsorption kinetic <span class="hlt">models</span> follow the sequence: PSO > PFO > IPD, where the values of R2 are 0.997 > 0.919 > 0.918. A high value of R2 (0.997) reveals better fitted experimental data. Furthermore, the value of qe cal in the PSO kinetic <span class="hlt">model</span> is very near to qe exp rather than that in other <span class="hlt">models</span>. This finding therefore suggests that the PSO kinetic <span class="hlt">model</span> has the good fitted with the experimental data which involved chemisorption process of divalent <span class="hlt">Fe</span> removal in groundwater solution. Thus, limestone adsorbent media found to be an alternative and effective treatment of <span class="hlt">Fe</span> removal from groundwater.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/949065-modeling-reaction-fe-atoms-ccl4','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/949065-modeling-reaction-fe-atoms-ccl4"><span><span class="hlt">Modeling</span> the Reaction of <span class="hlt">Fe</span> Atoms with CCl4</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Camaioni, Donald M.; Ginovska, Bojana; Dupuis, Michel</p> <p>2009-01-05</p> <p>The reaction of zero-valent iron with carbon tetrachloride (CCl4) in gas phase was studied using density functional theory. Temperature programmed desorption experiments over a range of <span class="hlt">Fe</span> and CCl4 coverages on a <span class="hlt">Fe</span>O(111) surface, demonstrate a rich surface chemistry with several reaction products (C2Cl4, C2Cl6, OCCl2, CO, <span class="hlt">Fe</span>Cl2, <span class="hlt">Fe</span>Cl3) observed. The reactivity of <span class="hlt">Fe</span> and CCl4 was studied under three stoichiometries, one <span class="hlt">Fe</span> with one CCl4, one <span class="hlt">Fe</span> with two CCl4 molecules and two <span class="hlt">Fe</span> with one CCl4, <span class="hlt">modeling</span> the environment of the experimental work. The electronic structure calculations give insight into the reactions leading to the experimentally observed productsmore » and suggest that novel <span class="hlt">Fe</span>-C-Cl containing species are important intermediates in these reactions. The intermediate complexes are formed in highly exothermic reactions, in agreement with the experimentally observed reactivity with the surface at low temperature (30 K). This initial survey of the reactivity of <span class="hlt">Fe</span> with CCl4 identifies some potential reaction pathways that are important in the effort to use <span class="hlt">Fe</span> nano-particles to differentiate harmful pathways that lead to the formation of contaminants like chloroform (CHCl3) from harmless pathways that lead to products such as formate (HCO2-) or carbon oxides in water and soil. The Pacific Northwest National Laboratory is operated by Battelle for the U.S. Department of Energy.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017JNuM..489..118F','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017JNuM..489..118F"><span>Mechanical properties of neutron-irradiated <span class="hlt">model</span> and commercial <span class="hlt">Fe</span>CrAl alloys</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Field, Kevin G.; Briggs, Samuel A.; Sridharan, Kumar; Howard, Richard H.; Yamamoto, Yukinori</p> <p>2017-06-01</p> <p>The development and understanding of the mechanical properties of neutron-irradiated <span class="hlt">Fe</span>CrAl alloys is increasingly a critical need as these alloys continue to become more mature for nuclear reactor applications. This study focuses on the mechanical properties of <span class="hlt">model</span> <span class="hlt">Fe</span>CrAl alloys and of a commercial <span class="hlt">Fe</span>CrAl alloy neutron-irradiated to up to 13.8 displacements per atom (dpa) at irradiation temperatures between 320 and 382 °C. Tensile tests were completed at room temperature and at 320 °C, and a subset of fractured tensile specimens was examined by scanning electron microscopy. Results showed typical radiation hardening and embrittlement indicative of high chromium ferritic alloys with strong chromium composition dependencies at lower doses. At and above 7.0 dpa, the mechanical properties saturated for both the commercial and <span class="hlt">model</span> <span class="hlt">Fe</span>CrAl alloys, although brittle cleavage fracture was observed at the highest dose in the <span class="hlt">model</span> <span class="hlt">Fe</span>CrAl alloy with the highest chromium content (18 wt %). The results suggest the composition and microstructure of <span class="hlt">Fe</span>CrAl alloys plays a critical role in the mechanical response of <span class="hlt">Fe</span>CrAl alloys irradiated near temperatures relevant to light water reactors.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2006AGUSM.V44A..03D','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2006AGUSM.V44A..03D"><span><span class="hlt">Modeling</span> Equilibrium <span class="hlt">Fe</span> Isotope Fractionation in <span class="hlt">Fe</span>-Organic Complexes: Implications for the use of <span class="hlt">Fe</span> Isotopes as a Biomarker and Trends Based on the Properties of Bound Ligands</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Domagal-Goldman, S.; Kubicki, J. D.</p> <p>2006-05-01</p> <p><span class="hlt">Fe</span> Isotopes have been proposed as a useful tracer of biological and geochemical processes. Key to understanding the effects these various processes have on <span class="hlt">Fe</span> isotopes is accurate <span class="hlt">modeling</span> of the reactions responsible for the isotope fractionations. In this study, we examined the theoretical basis for the claims that <span class="hlt">Fe</span> isotopes can be used as a biomarker. This was done by using molecular orbital/density functional theory (MO/DFT) calculations to predict the equilibrium fractionation of <span class="hlt">Fe</span> isotopes due to changes in the redox state and the bonding environment of <span class="hlt">Fe</span>. Specifically, we predicted vibrational frequencies for iron desferrioxamine (<span class="hlt">Fe</span>-DFOB), iron triscatechol (<span class="hlt">Fe</span>(cat)3), iron trisoxalate (<span class="hlt">Fe</span>(ox)3), and hexaaquo iron (<span class="hlt">Fe</span>(H2O)6) for complexes containing both ferrous (<span class="hlt">Fe</span>2+) and ferric (<span class="hlt">Fe</span>3+) iron. Using these vibrational frequencies, we then predicted fractionation factors between these six complexes. The predicted fractionation factors resulting from changes in the redox state of <span class="hlt">Fe</span> fell in the range 2.5- 3.5‰. The fractionation factors resulting from changes in the bonding environment of <span class="hlt">Fe</span> ranged from 0.2 to 1.4‰. These results indicate that changes in the bonding strength of <span class="hlt">Fe</span> ligands are less important to <span class="hlt">Fe</span> isotope fractionation processes than are changes to the redox state of <span class="hlt">Fe</span>. The implications for use of <span class="hlt">Fe</span> as a tracer of biological processes is clear: abiological redox changes must be ruled out in a sample before <span class="hlt">Fe</span> isotopes are considered as a potential biomarker. Furthermore, the use of <span class="hlt">Fe</span> isotopes to measure the redox state of the Earths surface environment through time is supported by this work, since changes in the redox state of <span class="hlt">Fe</span> appear to be the more important driver of isotopic fractionations. In addition to the large differences between redox-driven fractionations and ligand-driven fractionations, we will also show general trends in the demand for heavy <span class="hlt">Fe</span> isotopes as a function of properties of the bound ligand. This will help the</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1352774-thermodynamic-kinetic-modeling-grain-boundary-equilibrium-segregation-fe','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1352774-thermodynamic-kinetic-modeling-grain-boundary-equilibrium-segregation-fe"><span>Thermodynamic and kinetic <span class="hlt">modeling</span> of grain boundary equilibrium segregation of P in α-<span class="hlt">Fe</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Yang, Y.; Chen, S. -L.</p> <p>2017-04-18</p> <p>Phosphorus is a primary contributor to interface fracture and embrittlement in steels because of its strong segregation tendency at grain boundaries (GBs). The lack of consistency in literature data imposes great difficulties in performing segregation <span class="hlt">modeling</span> that is compatible with both the Langmuir-Mclean segregation theory and the thermodynamic description of the Bcc(<span class="hlt">Fe</span>,P) phase. Our work carefully evaluated experimental data for phosphorus segregation at GBs in -<span class="hlt">Fe</span> and provided a new formula for converting the auger electron spectroscopy (AES) peak height ratio to GBs. Furthermore, based on newly assessed literature data, this work proposes that the major driving force for phosphorusmore » segregation is the formation of <span class="hlt">Fe</span> 3P-type clusters at GBs, which is supported not only by the almost equivalent Gibbs energy of _<span class="hlt">Fe</span> using the Bcc(<span class="hlt">Fe</span>,P) substitutional <span class="hlt">model</span> and the Bcc(<span class="hlt">Fe,Fe</span> 3P, P) associate <span class="hlt">model</span>, but also by the good agreement between thermodynamic/kinetic <span class="hlt">modeling</span> results and experimental data.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/12547369','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/12547369"><span>Concept and development of an orthotropic <span class="hlt">FE</span> <span class="hlt">model</span> of the proximal femur.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Wirtz, Dieter Christian; Pandorf, Thomas; Portheine, Frank; Radermacher, Klaus; Schiffers, Norbert; Prescher, Andreas; Weichert, Dieter; Niethard, Fritz Uwe</p> <p>2003-02-01</p> <p>In contrast to many isotropic finite-element (<span class="hlt">FE</span>) <span class="hlt">models</span> of the femur in literature, it was the object of our study to develop an orthotropic <span class="hlt">FE</span> "<span class="hlt">model</span> femur" to realistically simulate three-dimensional bone remodelling. The three-dimensional geometry of the proximal femur was reconstructed by CT scans of a pair of cadaveric femurs at equal distances of 2mm. These three-dimensional CT <span class="hlt">models</span> were implemented into an <span class="hlt">FE</span> simulation tool. Well-known "density-determined" bony material properties (Young's modulus; Poisson's ratio; ultimate strength in pressure, tension and torsion; shear modulus) were assigned to each <span class="hlt">FE</span> of the same "CT-density-characterized" volumetric group. In order to fix the principal directions of stiffness in <span class="hlt">FE</span> areas with the same "density characterization", the cadaveric femurs were cut in 2mm slices in frontal (left femur) and sagittal plane (right femur). Each femoral slice was scanned into a computer-based image processing system. On these images, the principal directions of stiffness of cancellous and cortical bone were determined manually using the orientation of the trabecular structures and the Haversian system. Finally, these geometric data were matched with the "CT-density characterized" three-dimensional femur <span class="hlt">model</span>. In addition, the time and density-dependent adaptive behaviour of bone remodelling was taken into account by implementation of Carter's criterion. In the constructed "<span class="hlt">model</span> femur", each <span class="hlt">FE</span> is characterized by the principal directions of the stiffness and the "CT-density-determined" material properties of cortical and cancellous bone. Thus, on the basis of anatomic data a three-dimensional <span class="hlt">FE</span> simulation reference <span class="hlt">model</span> of the proximal femur was realized considering orthotropic conditions of bone behaviour. With the orthotropic "<span class="hlt">model</span> femur", the fundamental basis has been formed to realize realistic simulations of the dynamical processes of bone remodelling under different loading conditions or operative procedures</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1351763-mechanical-properties-neutron-irradiated-model-commercial-fecral-alloys','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1351763-mechanical-properties-neutron-irradiated-model-commercial-fecral-alloys"><span>Mechanical properties of neutron-irradiated <span class="hlt">model</span> and commercial <span class="hlt">Fe</span>CrAl alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Field, Kevin G.; Briggs, Samuel A.; Sridharan, Kumar; ...</p> <p>2017-03-28</p> <p>The development and understanding of the mechanical properties of neutron-irradiated <span class="hlt">Fe</span>CrAl alloys is increasingly a critical need as these alloys continue to become more mature for nuclear reactor applications. This study focuses on the mechanical properties of <span class="hlt">model</span> <span class="hlt">Fe</span>CrAl alloys and of a commercial <span class="hlt">Fe</span>CrAl alloy neutron-irradiated to up to 13.8 displacements per atom (dpa) at irradiation temperatures between 320 and 382 °C. Tensile tests were completed at room temperature and at 320 °C, and a subset of fractured tensile specimens was examined by scanning electron microscopy. Results showed typical radiation hardening and embrittlement indicative of high chromium ferritic alloysmore » with strong chromium composition dependencies at lower doses. At and above 7.0 dpa, the mechanical properties saturated for both the commercial and <span class="hlt">model</span> <span class="hlt">Fe</span>CrAl alloys, although brittle cleavage fracture was observed at the highest dose in the <span class="hlt">model</span> <span class="hlt">Fe</span>CrAl alloy with the highest chromium content (18 wt %). Finally, the results suggest the composition and microstructure of <span class="hlt">Fe</span>CrAl alloys plays a critical role in the mechanical response of <span class="hlt">Fe</span>CrAl alloys irradiated near temperatures relevant to light water reactors.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014EGUGA..16.4186L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014EGUGA..16.4186L"><span>Coupled cycling of <span class="hlt">Fe</span> and organic carbon in submarine hydrothermal systems: <span class="hlt">Modelling</span> approach</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Legendre, Louis; German, Christopher R.; Sander, Sylvia G.; Niquil, Nathalie</p> <p>2014-05-01</p> <p>It has been recently proposed that hydrothermal plumes may be a significant source of dissolved <span class="hlt">Fe</span> to the oceans. In order to assess this proposal, we investigated the fate of dissolved <span class="hlt">Fe</span> released from hydrothermal systems to the overlying ocean using an approach that combined <span class="hlt">modelling</span> and field values. We based our work on a consensus conceptual <span class="hlt">model</span> developed by members of SCOR-InterRidge Working Group 135. The <span class="hlt">model</span> was both complex enough to capture the main processes of dissolved <span class="hlt">Fe</span> released from hydrothermal systems and chemical transformation in the hydrothermal plume, and simple enough to be parameterized with existing field data. It included the following flows: <span class="hlt">Fe</span>, water and heat in the high temperature vent fluids, in the fluids diffusing around the vent, and in the entrained seawater in the buoyant plume; <span class="hlt">Fe</span> precipitation in polymetallic sulphides near the vent; transport of <span class="hlt">Fe</span> in the non-buoyant plume, and both its precipitation in particles onto the sea bottom away from the vent and dissolution into deep-sea waters. In other words, there were three <span class="hlt">Fe</span> input flows into the buoyant hydrothermal plume (vent-fluids; entrained diffuse flow; entrained seawater) and three <span class="hlt">Fe</span> output flows (sedimentation from the buoyant plume as polymetallic sulfides; sedimentation from the non-buoyant plume in particulate form; export to the deep ocean in dissolved or nanoparticulate form). The output flows balanced the input flows. We transformed the conceptual <span class="hlt">model</span> into equations, and parameterized these with field data. To do so, we assumed that all hydrothermal systems, globally, can be represented by the circumstances that prevail at the EPR 9°50'N hydrothermal field, although we knew this assumption not to be accurate. We nevertheless achieved, by following this approach, two important goals, i.e. we could assemble into a coherent framework, for the first time, several discrete data sets acquired independently over decades of field work, and we could obtain <span class="hlt">model</span></p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/1376391-dislocation-loop-evolution-during-situ-ion-irradiation-model-fecral-alloys','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/1376391-dislocation-loop-evolution-during-situ-ion-irradiation-model-fecral-alloys"><span>Dislocation loop evolution during in-situ ion irradiation of <span class="hlt">model</span> <span class="hlt">Fe</span>CrAl alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Haley, Jack C.; Briggs, Samuel A.; Edmondson, Philip D.</p> <p></p> <p><span class="hlt">Model</span> <span class="hlt">Fe</span>CrAl alloys of <span class="hlt">Fe</span>-10%Cr-5%Al, <span class="hlt">Fe</span>-12%Cr-4.5%Al, <span class="hlt">Fe</span>-15%Cr-4%Al, and <span class="hlt">Fe</span>-18%Cr-3%Al (in wt %) were irradiated with 1 MeV Kr++ ions in-situ with transmission electron microscopy to a dose of 2.5 displacements per atom (dpa) at 320 °C. In all cases, the microstructural damage consisted of dislocation loops with ½< 111 > and <100 > Burgers vectors. The proportion of ½< 111 > dislocation loops varied from ~50% in the <span class="hlt">Fe</span>-10%Cr-5%Al <span class="hlt">model</span> alloy and the <span class="hlt">Fe</span>-18Cr%-3%Al <span class="hlt">model</span> alloy to a peak of ~80% in the <span class="hlt">model</span> <span class="hlt">Fe</span>-15%Cr-4.5%Al alloy. The dislocation loop volume density increased with dose for all alloys and showed signsmore » of approaching an upper limit. The total loop populations at 2.5 dpa had a slight (and possibly insignificant) decline as the chromium content was increased from 10 to 15 wt %, but the <span class="hlt">Fe</span>-18%Cr-3%Al alloy had a dislocation loop population ~50% smaller than the other <span class="hlt">model</span> alloys. As a result, the largest dislocation loops in each alloy had image sizes of close to 20 nm in the micrographs, and the median diameters for all alloys ranged from 6 to 8 nm. Nature analysis by the inside-outside method indicated most dislocation loops were interstitial type.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1376391-dislocation-loop-evolution-during-situ-ion-irradiation-model-fecral-alloys','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1376391-dislocation-loop-evolution-during-situ-ion-irradiation-model-fecral-alloys"><span>Dislocation loop evolution during in-situ ion irradiation of <span class="hlt">model</span> <span class="hlt">Fe</span>CrAl alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Haley, Jack C.; Briggs, Samuel A.; Edmondson, Philip D.; ...</p> <p>2017-07-06</p> <p><span class="hlt">Model</span> <span class="hlt">Fe</span>CrAl alloys of <span class="hlt">Fe</span>-10%Cr-5%Al, <span class="hlt">Fe</span>-12%Cr-4.5%Al, <span class="hlt">Fe</span>-15%Cr-4%Al, and <span class="hlt">Fe</span>-18%Cr-3%Al (in wt %) were irradiated with 1 MeV Kr++ ions in-situ with transmission electron microscopy to a dose of 2.5 displacements per atom (dpa) at 320 °C. In all cases, the microstructural damage consisted of dislocation loops with ½< 111 > and <100 > Burgers vectors. The proportion of ½< 111 > dislocation loops varied from ~50% in the <span class="hlt">Fe</span>-10%Cr-5%Al <span class="hlt">model</span> alloy and the <span class="hlt">Fe</span>-18Cr%-3%Al <span class="hlt">model</span> alloy to a peak of ~80% in the <span class="hlt">model</span> <span class="hlt">Fe</span>-15%Cr-4.5%Al alloy. The dislocation loop volume density increased with dose for all alloys and showed signsmore » of approaching an upper limit. The total loop populations at 2.5 dpa had a slight (and possibly insignificant) decline as the chromium content was increased from 10 to 15 wt %, but the <span class="hlt">Fe</span>-18%Cr-3%Al alloy had a dislocation loop population ~50% smaller than the other <span class="hlt">model</span> alloys. As a result, the largest dislocation loops in each alloy had image sizes of close to 20 nm in the micrographs, and the median diameters for all alloys ranged from 6 to 8 nm. Nature analysis by the inside-outside method indicated most dislocation loops were interstitial type.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4813892','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4813892"><span>SHM-Based Probabilistic Fatigue Life Prediction for Bridges Based on <span class="hlt">FE</span> <span class="hlt">Model</span> Updating</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Lee, Young-Joo; Cho, Soojin</p> <p>2016-01-01</p> <p>Fatigue life prediction for a bridge should be based on the current condition of the bridge, and various sources of uncertainty, such as material properties, anticipated vehicle loads and environmental conditions, make the prediction very challenging. This paper presents a new approach for probabilistic fatigue life prediction for bridges using finite element (<span class="hlt">FE</span>) <span class="hlt">model</span> updating based on structural health monitoring (SHM) data. Recently, various types of SHM systems have been used to monitor and evaluate the long-term structural performance of bridges. For example, SHM data can be used to estimate the degradation of an in-service bridge, which makes it possible to update the initial <span class="hlt">FE</span> <span class="hlt">model</span>. The proposed method consists of three steps: (1) identifying the modal properties of a bridge, such as mode shapes and natural frequencies, based on the ambient vibration under passing vehicles; (2) updating the structural parameters of an initial <span class="hlt">FE</span> <span class="hlt">model</span> using the identified modal properties; and (3) predicting the probabilistic fatigue life using the updated <span class="hlt">FE</span> <span class="hlt">model</span>. The proposed method is demonstrated by application to a numerical <span class="hlt">model</span> of a bridge, and the impact of <span class="hlt">FE</span> <span class="hlt">model</span> updating on the bridge fatigue life is discussed. PMID:26950125</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016MMTA...47.4970T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016MMTA...47.4970T"><span>Precipitation <span class="hlt">Modeling</span> in Nitriding in <span class="hlt">Fe</span>-M Binary System</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Tomio, Yusaku; Miyamoto, Goro; Furuhara, Tadashi</p> <p>2016-10-01</p> <p>Precipitation of fine alloy nitrides near the specimen surface results in significant surface hardening in nitriding of alloyed steels. In this study, a simulation <span class="hlt">model</span> of alloy nitride precipitation during nitriding is developed for <span class="hlt">Fe</span>-M binary system based upon the Kampmann-Wagner numerical <span class="hlt">model</span> in order to predict variations in the distribution of precipitates with depth. The <span class="hlt">model</span> can predict the number density, average radius, and volume fraction of alloy nitrides as a function of depth from the surface and nitriding time. By a comparison with the experimental observation in a nitrided <span class="hlt">Fe</span>-Cr alloy, it was found that the <span class="hlt">model</span> can predict successfully the observed particle distribution from the surface into depth when appropriate solubility of CrN, interfacial energy between CrN and α, and nitrogen flux at the surface are selected.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016CoMP..171...74K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016CoMP..171...74K"><span>Melting relations in the system <span class="hlt">Fe</span>CO3-MgCO3 and thermodynamic <span class="hlt">modelling</span> of <span class="hlt">Fe</span>-Mg carbonate melts</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kang, Nathan; Schmidt, Max W.; Poli, Stefano; Connolly, James A. D.; Franzolin, Ettore</p> <p>2016-09-01</p> <p>To constrain the thermodynamics and melting relations of the siderite-magnesite (<span class="hlt">Fe</span>CO3-MgCO3) system, 27 piston cylinder experiments were conducted at 3.5 GPa and 1170-1575 °C. <span class="hlt">Fe</span>-rich compositions were also investigated with 13 multi-anvil experiments at 10, 13.6 and 20 GPa, 1500-1890 °C. At 3.5 GPa, the solid solution siderite-magnesite coexists with melt over a compositional range of X Mg (=Mg/(Mg + Fetot)) = 0.38-1.0, while at ≥10 GPa solid solution appears to be complete. At 3.5 GPa, the system is pseudo-binary because of the limited stability of siderite or liquid <span class="hlt">Fe</span>CO3, <span class="hlt">Fe</span>-rich carbonates decomposing at subsolidus conditions to magnetite-magnesioferrite solid solution, graphite and CO2. Similar reactions also occur with liquid <span class="hlt">Fe</span>CO3 resulting in melt species with ferric iron components, but the decomposition of the liquid decreases in importance with pressure. At 3.5 GPa, the metastable melting temperature of pure siderite is located at 1264 °C, whereas pure magnesite melts at 1629 °C. The melting loop is non-ideal on the <span class="hlt">Fe</span> side where the dissociation reaction resulting in <span class="hlt">Fe</span>3+ in the melt depresses melting temperatures and causes a minimum. Over the pressure range of 3.5-20 GPa, this minimum is 20-35 °C lower than the (metastable) siderite melting temperature. By merging all present and previous experimental data, standard state (298.15 K, 1 bar) thermodynamic properties of the magnesite melt (MgCO3L) end member are calculated and the properties of (<span class="hlt">Fe</span>,Mg)CO3 melt fit by a regular solution <span class="hlt">model</span> with an interaction parameter of -7600 J/mol. The solution <span class="hlt">model</span> reproduces the asymmetric melting loop and predicts the thermal minimum at 1240 °C near the siderite side at X Mg = 0.2 (3.5 GPa). The solution <span class="hlt">model</span> is applicable to pressures reaching to the bottom of the upper mantle and allows calculation of phase relations in the <span class="hlt">Fe</span>O-MgO-O2-C system.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_1");'>1</a></li> <li class="active"><span>2</span></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_2 --> <div id="page_3" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_1");'>1</a></li> <li><a href="#" onclick='return showDiv("page_2");'>2</a></li> <li class="active"><span>3</span></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="41"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/17574704','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/17574704"><span>Channel flow and trichloroethylene treatment in a <span class="hlt">partly</span> iron-filled fracture: experimental and <span class="hlt">model</span> results.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Cai, Zuansi; Merly, Corrine; Thomson, Neil R; Wilson, Ryan D; Lerner, David N</p> <p>2007-08-15</p> <p>Technical developments have now made it possible to emplace granular zero-valent iron (<span class="hlt">Fe</span>(0)) in fractured media to create a <span class="hlt">Fe</span>(0) fracture reactive barrier (<span class="hlt">Fe</span>(0) FRB) for the treatment of contaminated groundwater. To evaluate this concept, we conducted a laboratory experiment in which trichloroethylene (TCE) contaminated water was flushed through a single uniform fracture created between two sandstone blocks. This fracture was <span class="hlt">partly</span> filled with what was intended to be a uniform thickness of iron. Partial treatment of TCE by iron demonstrated that the concept of a <span class="hlt">Fe</span>(0) FRB is practical, but was less than anticipated for an iron layer of uniform thickness. When the experiment was disassembled, evidence of discrete channelised flow was noted and attributed to imperfect placement of the iron. To evaluate the effect of the channel flow, an explicit Channel <span class="hlt">Model</span> was developed that simplifies this complex flow regime into a conceptualised set of uniform and parallel channels. The mathematical representation of this conceptualisation directly accounts for (i) flow channels and immobile fluid arising from the non-uniform iron placement, (ii) mass transfer from the open fracture to iron and immobile fluid regions, and (iii) degradation in the iron regions. A favourable comparison between laboratory data and the results from the developed mathematical <span class="hlt">model</span> suggests that the <span class="hlt">model</span> is capable of representing TCE degradation in fractures with non-uniform iron placement. In order to apply this Channel <span class="hlt">Model</span> concept to a <span class="hlt">Fe</span>(0) FRB system, a simplified, or implicit, Lumped Channel <span class="hlt">Model</span> was developed where the physical and chemical processes in the iron layer and immobile fluid regions are captured by a first-order lumped rate parameter. The performance of this Lumped Channel <span class="hlt">Model</span> was compared to laboratory data, and benchmarked against the Channel <span class="hlt">Model</span>. The advantages of the Lumped Channel <span class="hlt">Model</span> are that the degradation of TCE in the system is represented by a first</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2007JCHyd..93..284C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2007JCHyd..93..284C"><span>Channel flow and trichloroethylene treatment in a <span class="hlt">partly</span> iron-filled fracture: Experimental and <span class="hlt">model</span> results</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Cai, Zuansi; Merly, Corrine; Thomson, Neil R.; Wilson, Ryan D.; Lerner, David N.</p> <p>2007-08-01</p> <p>Technical developments have now made it possible to emplace granular zero-valent iron (<span class="hlt">Fe</span> 0) in fractured media to create a <span class="hlt">Fe</span> 0 fracture reactive barrier (<span class="hlt">Fe</span> 0 FRB) for the treatment of contaminated groundwater. To evaluate this concept, we conducted a laboratory experiment in which trichloroethylene (TCE) contaminated water was flushed through a single uniform fracture created between two sandstone blocks. This fracture was <span class="hlt">partly</span> filled with what was intended to be a uniform thickness of iron. Partial treatment of TCE by iron demonstrated that the concept of a <span class="hlt">Fe</span> 0 FRB is practical, but was less than anticipated for an iron layer of uniform thickness. When the experiment was disassembled, evidence of discrete channelised flow was noted and attributed to imperfect placement of the iron. To evaluate the effect of the channel flow, an explicit Channel <span class="hlt">Model</span> was developed that simplifies this complex flow regime into a conceptualised set of uniform and parallel channels. The mathematical representation of this conceptualisation directly accounts for (i) flow channels and immobile fluid arising from the non-uniform iron placement, (ii) mass transfer from the open fracture to iron and immobile fluid regions, and (iii) degradation in the iron regions. A favourable comparison between laboratory data and the results from the developed mathematical <span class="hlt">model</span> suggests that the <span class="hlt">model</span> is capable of representing TCE degradation in fractures with non-uniform iron placement. In order to apply this Channel <span class="hlt">Model</span> concept to a <span class="hlt">Fe</span> 0 FRB system, a simplified, or implicit, Lumped Channel <span class="hlt">Model</span> was developed where the physical and chemical processes in the iron layer and immobile fluid regions are captured by a first-order lumped rate parameter. The performance of this Lumped Channel <span class="hlt">Model</span> was compared to laboratory data, and benchmarked against the Channel <span class="hlt">Model</span>. The advantages of the Lumped Channel <span class="hlt">Model</span> are that the degradation of TCE in the system is represented by a first</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015MNRAS.454.2549B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015MNRAS.454.2549B"><span>Spectral <span class="hlt">models</span> for early time SN 2011<span class="hlt">fe</span> observations</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Baron, E.; Hoeflich, P.; Friesen, Brian; Sullivan, M.; Hsiao, E.; Ellis, R. S.; Gal-Yam, A.; Howell, D. A.; Nugent, P. E.; Dominguez, I.; Krisciunas, K.; Phillips, M. M.; Suntzeff, N.; Wang, L.; Thomas, R. C.</p> <p>2015-12-01</p> <p>We use observed UV through near-IR spectra to examine whether SN 2011<span class="hlt">fe</span> can be understood in the framework of Branch-normal Type Ia supernovae (SNe Ia) and to examine its individual peculiarities. As a benchmark, we use a delayed-detonation <span class="hlt">model</span> with a progenitor metallicity of Z⊙/20. We study the sensitivity of features to variations in progenitor metallicity, the outer density profile, and the distribution of radioactive nickel. The effect of metallicity variations in the progenitor have a relatively small effect on the synthetic spectra. We also find that the abundance stratification of SN 2011<span class="hlt">fe</span> resembles closely that of a delayed-detonation <span class="hlt">model</span> with a transition density that has been fit to other Branch-normal SNe Ia. At early times, the <span class="hlt">model</span> photosphere is formed in material with velocities that are too high, indicating that the photosphere recedes too slowly or that SN 2011<span class="hlt">fe</span> has a lower specific energy in the outer ≈0.1 M⊙ than does the <span class="hlt">model</span>. We discuss several explanations for the discrepancies. Finally, we examine variations in both the spectral energy distribution and in the colours due to variations in the progenitor metallicity, which suggests that colours are only weak indicators for the progenitor metallicity, in the particular explosion <span class="hlt">model</span> that we have studied. We do find that the flux in the U band is significantly higher at maximum light in the solar metallicity <span class="hlt">model</span> than in the lower metallicity <span class="hlt">model</span> and the lower metallicity <span class="hlt">model</span> much better matches the observed spectrum.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JOM....67i2047P','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JOM....67i2047P"><span>Development of Simultaneous Corrosion Barrier and Optimized Microstructure in <span class="hlt">Fe</span>CrAl Heat-Resistant Alloy for Energy Applications. <span class="hlt">Part</span> 1: The Protective Scale</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Pimentel, G.; Aranda, M. M.; Chao, J.; González-Carrasco, J. L.; Capdevila, C.</p> <p>2015-09-01</p> <p>Coarse-grained <span class="hlt">Fe</span>-based oxide dispersion-strengthened (ODS) steels are a class of advanced materials for combined cycle gas turbine systems to deal with operating temperatures and pressures of around 1100°C and 15-30 bar in aggressive environments, which would increase biomass energy conversion efficiencies up to 45% and above. This two-<span class="hlt">part</span> paper reports the possibility of the development of simultaneous corrosion barrier and optimized microstructure in a <span class="hlt">Fe</span>CrAl heat-resistant alloy for energy applications. The first <span class="hlt">part</span> reports the mechanism of generating a dense, self-healing α-alumina layer by thermal oxidation, during a heat treatment that leads to a coarse-grained microstructure with a potential value for high-temperature creep resistance in a <span class="hlt">Fe</span>CrAl ODS ferritic alloy, which will be described in more detail in the second <span class="hlt">part</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/servlets/purl/1389187','SCIGOV-STC'); return false;" href="https://www.osti.gov/servlets/purl/1389187"><span>Literature review report on atomistic <span class="hlt">modeling</span> tools for <span class="hlt">Fe</span>CrAl alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Zhang, Yongfeng; Schwen, Daniel; Martinez, Enrique</p> <p>2015-12-01</p> <p>This reports summarizes the literature review results on atomistic tools, particularly interatomic potentials used in molecular dynamics simulations, for <span class="hlt">Fe</span>CrAl ternary alloys. <span class="hlt">Fe</span>CrAl has recently been identified as a possible cladding concept for accident tolerant fuels for its superior corrosion resistance. Along with several other concepts, an initial evaluation and recommendation are desired for <span class="hlt">Fe</span>CrAl before it’s used in realistic fuels. For this purpose, sufficient understanding on the in-reactor behavior of <span class="hlt">Fe</span>CrAl needs to be grained in a relatively short timeframe, and multiscale <span class="hlt">modeling</span> and simulations have been selected as an efficient measure to supplement experiments and in-reactor testing formore » better understanding on <span class="hlt">Fe</span>CrAl. For the limited knowledge on <span class="hlt">Fe</span>CrAl alloys, the multiscale <span class="hlt">modeling</span> approach relies on atomistic simulations to obtain the missing material parameters and properties. As a first step, atomistic tools have to be identified and this is the purpose of the present report. It was noticed during the literature survey that no interatomic potentials currently available for <span class="hlt">Fe</span>CrAl. Here, we summarize the interatomic potentials available for <span class="hlt">Fe</span>Cr alloys for possible molecular dynamics studies using <span class="hlt">Fe</span>Cr as surrogate materials. Other atomistic methods such as lattice kinetic Monte Carlo are also included in this report. A couple of research topics at the atomic scale are suggested based on the literature survey.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1407294-spectral-models-early-time-sn-observations','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1407294-spectral-models-early-time-sn-observations"><span>Spectral <span class="hlt">models</span> for early time SN 2011<span class="hlt">fe</span> observations</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Baron, E.; Hoeflich, P.; Friesen, Brian; ...</p> <p>2015-10-13</p> <p>We use observed UV through near-IR spectra to examine whether SN 2011<span class="hlt">fe</span> can be understood in the framework of Branch-normal Type Ia supernovae (SNe Ia) and to examine its individual peculiarities. As a benchmark, we use a delayed-detonationmodel with a progenitormetallicity of Z ⊙/20. We study the sensitivity of features to variations in progenitor metallicity, the outer density profile, and the distribution of radioactive nickel. The effect of metallicity variations in the progenitor have a relatively small effect on the synthetic spectra. We also find that the abundance stratification of SN 2011<span class="hlt">fe</span> resembles closely that of a delayed-detonation <span class="hlt">model</span> withmore » a transition density that has been fit to other Branch-normal SNe Ia. At early times, the <span class="hlt">model</span> photosphere is formed in material with velocities that are too high, indicating that the photosphere recedes too slowly or that SN 2011<span class="hlt">fe</span> has a lower specific energy in the outer ≈0.1 M ⊙ than does the <span class="hlt">model</span>. We discuss several explanations for the discrepancies. Lastly, we examine variations in both the spectral energy distribution and in the colours due to variations in the progenitor metallicity, which suggests that colours are only weak indicators for the progenitor metallicity, in the particular explosion <span class="hlt">model</span> that we have studied. Here we do find that the flux in the U band is significantly higher at maximum light in the solar metallicity <span class="hlt">model</span> than in the lower metallicity <span class="hlt">model</span> and the lower metallicity <span class="hlt">model</span> much better matches the observed spectrum.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017JCoPh.338..285J','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017JCoPh.338..285J"><span><span class="hlt">Model</span>'s sparse representation based on reduced mixed GMs<span class="hlt">FE</span> basis methods</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Jiang, Lijian; Li, Qiuqi</p> <p>2017-06-01</p> <p>In this paper, we propose a <span class="hlt">model</span>'s sparse representation based on reduced mixed generalized multiscale finite element (GMs<span class="hlt">FE</span>) basis methods for elliptic PDEs with random inputs. A typical application for the elliptic PDEs is the flow in heterogeneous random porous media. Mixed generalized multiscale finite element method (GMsFEM) is one of the accurate and efficient approaches to solve the flow problem in a coarse grid and obtain the velocity with local mass conservation. When the inputs of the PDEs are parameterized by the random variables, the GMs<span class="hlt">FE</span> basis functions usually depend on the random parameters. This leads to a large number degree of freedoms for the mixed GMsFEM and substantially impacts on the computation efficiency. In order to overcome the difficulty, we develop reduced mixed GMs<span class="hlt">FE</span> basis methods such that the multiscale basis functions are independent of the random parameters and span a low-dimensional space. To this end, a greedy algorithm is used to find a set of optimal samples from a training set scattered in the parameter space. Reduced mixed GMs<span class="hlt">FE</span> basis functions are constructed based on the optimal samples using two optimal sampling strategies: basis-oriented cross-validation and proper orthogonal decomposition. Although the dimension of the space spanned by the reduced mixed GMs<span class="hlt">FE</span> basis functions is much smaller than the dimension of the original full order <span class="hlt">model</span>, the online computation still depends on the number of coarse degree of freedoms. To significantly improve the online computation, we integrate the reduced mixed GMs<span class="hlt">FE</span> basis methods with sparse tensor approximation and obtain a sparse representation for the <span class="hlt">model</span>'s outputs. The sparse representation is very efficient for evaluating the <span class="hlt">model</span>'s outputs for many instances of parameters. To illustrate the efficacy of the proposed methods, we present a few numerical examples for elliptic PDEs with multiscale and random inputs. In particular, a two-phase flow <span class="hlt">model</span> in random porous</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/22622295-model-sparse-representation-based-reduced-mixed-gmsfe-basis-methods','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/22622295-model-sparse-representation-based-reduced-mixed-gmsfe-basis-methods"><span><span class="hlt">Model</span>'s sparse representation based on reduced mixed GMs<span class="hlt">FE</span> basis methods</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Jiang, Lijian, E-mail: ljjiang@hnu.edu.cn; Li, Qiuqi, E-mail: qiuqili@hnu.edu.cn</p> <p>2017-06-01</p> <p>In this paper, we propose a <span class="hlt">model</span>'s sparse representation based on reduced mixed generalized multiscale finite element (GMs<span class="hlt">FE</span>) basis methods for elliptic PDEs with random inputs. A typical application for the elliptic PDEs is the flow in heterogeneous random porous media. Mixed generalized multiscale finite element method (GMsFEM) is one of the accurate and efficient approaches to solve the flow problem in a coarse grid and obtain the velocity with local mass conservation. When the inputs of the PDEs are parameterized by the random variables, the GMs<span class="hlt">FE</span> basis functions usually depend on the random parameters. This leads to a largemore » number degree of freedoms for the mixed GMsFEM and substantially impacts on the computation efficiency. In order to overcome the difficulty, we develop reduced mixed GMs<span class="hlt">FE</span> basis methods such that the multiscale basis functions are independent of the random parameters and span a low-dimensional space. To this end, a greedy algorithm is used to find a set of optimal samples from a training set scattered in the parameter space. Reduced mixed GMs<span class="hlt">FE</span> basis functions are constructed based on the optimal samples using two optimal sampling strategies: basis-oriented cross-validation and proper orthogonal decomposition. Although the dimension of the space spanned by the reduced mixed GMs<span class="hlt">FE</span> basis functions is much smaller than the dimension of the original full order <span class="hlt">model</span>, the online computation still depends on the number of coarse degree of freedoms. To significantly improve the online computation, we integrate the reduced mixed GMs<span class="hlt">FE</span> basis methods with sparse tensor approximation and obtain a sparse representation for the <span class="hlt">model</span>'s outputs. The sparse representation is very efficient for evaluating the <span class="hlt">model</span>'s outputs for many instances of parameters. To illustrate the efficacy of the proposed methods, we present a few numerical examples for elliptic PDEs with multiscale and random inputs. In particular, a two-phase flow <span class="hlt">model</span> in random</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/22911248','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/22911248"><span>Di/mono-nuclear iron(I)/(II) complexes as functional <span class="hlt">models</span> for the 2<span class="hlt">Fe</span>2S subunit and distal <span class="hlt">Fe</span> moiety of the active site of [<span class="hlt">FeFe</span>] hydrogenases: protonations, molecular structures and electrochemical properties.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Gao, Shang; Fan, Jiangli; Sun, Shiguo; Song, Fengling; Peng, Xiaojun; Duan, Qian; Jiang, Dayong; Liang, Qingcheng</p> <p>2012-10-21</p> <p>Di/mono-nuclear iron(I)/(II) complexes containing conjugated and electron-withdrawing S-to-S linkers, [{(μ-S)(2)(C(4)N(2)H(2))}<span class="hlt">Fe</span>(2)(CO)(6)] (1), [{(μ-S)(2)(C(4)N(2)H(2))}<span class="hlt">Fe</span>(2)(CO)(5)(PMe(3))] (1P), and [{(μ-S)(2)(C(4)N(2)H(2))}<span class="hlt">Fe</span>(CO)(2)(PMe(3))(2)] (2) were prepared as biomimetic <span class="hlt">models</span> for the 2<span class="hlt">Fe</span>2S subunit and distal <span class="hlt">Fe</span> moiety of the active site of [<span class="hlt">FeFe</span>] hydrogenases. The N atoms in the heterocyclic pyrazines of 1 and 2 were protonated in the presence of proton acid to generate one and two hydrides, [1(NH)](+) CF(3)SO(3)(-), [2(NH)](+) CF(3)SO(3)(-), and [2(NH)(2)](2+) (CF(3)SO(3)(-))(2), respectively. The protonation processes were evidenced by in situ IR and NMR spectroscopy. The molecular structures of the protonated species [1(NH)](+) CF(3)SO(3)(-) and [2(NH)(2)](2+) (CF(3)SO(3)(-))(2) together with their originating complexes and , and the mono-PMe(3) substituted diiron complex were identified by X-ray crystallography. The IR and single-crystal analysis data all suggested that the electron-withdrawing bridge, pyrazine, led to decreased electron density at the <span class="hlt">Fe</span> centers of the <span class="hlt">model</span> complexes, which was consistent with the electrochemical studies. The cyclic voltammograms indicated that complex exhibited a low primary reduction potential at -1.17 V vs. Fc-Fc(+) with a 270 mV positive shift compared with that of the benzene-1,2-dithiolate (bdt) bridged analogue [(μ-bdt)<span class="hlt">Fe</span>(2)(CO)(6)]. Under the weak acid conditions, complexes 1 and 2 could electrochemically catalyze the proton reduction. More interestingly, the mononuclear ferrous complex 2 showed two catalytic peaks during the formation of hydrogen, confirming its potential as a catalyst for hydrogen production.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/28287233','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/28287233"><span>Dithiolato-bridged nickel-iron complexes as <span class="hlt">models</span> for the active site of [Ni<span class="hlt">Fe</span>]-hydrogenases.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Song, Li-Cheng; Yang, Xi-Yue; Cao, Meng; Gao, Xiu-Yun; Liu, Bei-Bei; Zhu, Liang; Jiang, Feng</p> <p>2017-03-30</p> <p>The structural and functional <span class="hlt">modeling</span> of the active site of [Ni<span class="hlt">Fe</span>]-hydrogenases has been proved to be challenging to a great extent. Herein, we report the synthesis, structures, and some properties of the Ni<span class="hlt">Fe</span>-based dicarbonyl, terminal hydride, and μ-hydroxo <span class="hlt">models</span> for the active site of [Ni<span class="hlt">Fe</span>]-hydrogenases.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4510704','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4510704"><span>Synthetic Active Site <span class="hlt">Model</span> of the [Ni<span class="hlt">Fe</span>Se] Hydrogenase</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Wombwell, Claire; Reisner, Erwin</p> <p>2015-01-01</p> <p>A dinuclear synthetic <span class="hlt">model</span> of the [Ni<span class="hlt">Fe</span>Se] hydrogenase active site and a structural, spectroscopic and electrochemical analysis of this complex is reported. [Ni<span class="hlt">Fe</span>(‘S2Se2’)(CO)3] (H2‘S2Se2’=1,2-bis(2-thiabutyl-3,3-dimethyl-4-selenol)benzene) has been synthesized by reacting the nickel selenolate complex [Ni(‘S2Se2’)] with [<span class="hlt">Fe</span>(CO)3bda] (bda=benzylideneacetone). X-ray crystal structure analysis confirms that [Ni<span class="hlt">Fe</span>(‘S2Se2’)(CO)3] mimics the key structural features of the enzyme active site, including a doubly bridged heterobimetallic nickel and iron center with a selenolate terminally coordinated to the nickel center. Comparison of [Ni<span class="hlt">Fe</span>(‘S2Se2’)(CO)3] with the previously reported thiolate analogue [Ni<span class="hlt">Fe</span>(‘S4’)(CO)3] (H2‘S4’=H2xbsms=1,2-bis(4-mercapto-3,3-dimethyl-2-thiabutyl)benzene) showed that the selenolate groups in [Ni<span class="hlt">Fe</span>(‘S2Se2’)(CO)3] give lower carbonyl stretching frequencies in the IR spectrum. Electrochemical studies of [Ni<span class="hlt">Fe</span>(‘S2Se2’)(CO)3] and [Ni<span class="hlt">Fe</span>(‘S4’)(CO)3] demonstrated that both complexes do not operate as homogenous H2 evolution catalysts, but are precursors to a solid deposit on an electrode surface for H2 evolution catalysis in organic and aqueous solution. PMID:25847470</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/27133088','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/27133088"><span>Reaction Mechanisms of Metals with Hydrogen Sulfide and Thiols in <span class="hlt">Model</span> Wine. <span class="hlt">Part</span> 2: Iron- and Copper-Catalyzed Oxidation.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Kreitman, Gal Y; Danilewicz, John C; Jeffery, David W; Elias, Ryan J</p> <p>2016-05-25</p> <p>Sulfidic off-odors arising during wine production are frequently removed by Cu(II) fining. In <span class="hlt">part</span> 1 of this study ( 10.1021/acs.jafc.6b00641 ), the reaction of H2S and thiols with Cu(II) was examined; however, the interaction of iron and copper is also known to play an important synergistic role in mediating non-enzymatic wine oxidation. The interaction of these two metals in the oxidation of H2S and thiols (cysteine, 3-sulfanylhexan-1-ol, and 6-sulfanylhexan-1-ol) was therefore examined under wine-like conditions. H2S and thiols (300 μM) were reacted with <span class="hlt">Fe</span>(III) (100 or 200 μM) alone and in combination with Cu(II) (25 or 50 μM), and concentrations of H2S and thiols, oxygen, and acetaldehyde were monitored over time. H2S and thiols were shown to be slowly oxidized in the presence of <span class="hlt">Fe</span>(III) alone and were not bound to <span class="hlt">Fe</span>(III) under <span class="hlt">model</span> wine conditions. However, Cu(II) added to <span class="hlt">model</span> wine containing <span class="hlt">Fe</span>(III) was quickly reduced by H2S and thiols to form Cu(I) complexes, which then rapidly reduced <span class="hlt">Fe</span>(III) to <span class="hlt">Fe</span>(II). Oxidation of <span class="hlt">Fe</span>(II) in the presence of oxygen regenerated <span class="hlt">Fe</span>(III) and completed the iron redox cycle. In addition, sulfur-derived oxidation products were observed, and the formation of organic polysulfanes was demonstrated.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017MSSP...93..661A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017MSSP...93..661A"><span>Bayesian nonlinear structural <span class="hlt">FE</span> <span class="hlt">model</span> and seismic input identification for damage assessment of civil structures</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Astroza, Rodrigo; Ebrahimian, Hamed; Li, Yong; Conte, Joel P.</p> <p>2017-09-01</p> <p>A methodology is proposed to update mechanics-based nonlinear finite element (<span class="hlt">FE</span>) <span class="hlt">models</span> of civil structures subjected to unknown input excitation. The approach allows to jointly estimate unknown time-invariant <span class="hlt">model</span> parameters of a nonlinear <span class="hlt">FE</span> <span class="hlt">model</span> of the structure and the unknown time histories of input excitations using spatially-sparse output response measurements recorded during an earthquake event. The unscented Kalman filter, which circumvents the computation of <span class="hlt">FE</span> response sensitivities with respect to the unknown <span class="hlt">model</span> parameters and unknown input excitations by using a deterministic sampling approach, is employed as the estimation tool. The use of measurement data obtained from arrays of heterogeneous sensors, including accelerometers, displacement sensors, and strain gauges is investigated. Based on the estimated <span class="hlt">FE</span> <span class="hlt">model</span> parameters and input excitations, the updated nonlinear <span class="hlt">FE</span> <span class="hlt">model</span> can be interrogated to detect, localize, classify, and assess damage in the structure. Numerically simulated response data of a three-dimensional 4-story 2-by-1 bay steel frame structure with six unknown <span class="hlt">model</span> parameters subjected to unknown bi-directional horizontal seismic excitation, and a three-dimensional 5-story 2-by-1 bay reinforced concrete frame structure with nine unknown <span class="hlt">model</span> parameters subjected to unknown bi-directional horizontal seismic excitation are used to illustrate and validate the proposed methodology. The results of the validation studies show the excellent performance and robustness of the proposed algorithm to jointly estimate unknown <span class="hlt">FE</span> <span class="hlt">model</span> parameters and unknown input excitations.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/25847470','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/25847470"><span>Synthetic Active Site <span class="hlt">Model</span> of the [Ni<span class="hlt">Fe</span>Se] Hydrogenase.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Wombwell, Claire; Reisner, Erwin</p> <p>2015-05-26</p> <p>A dinuclear synthetic <span class="hlt">model</span> of the [Ni<span class="hlt">Fe</span>Se] hydrogenase active site and a structural, spectroscopic and electrochemical analysis of this complex is reported. [Ni<span class="hlt">Fe</span>('S2Se2')(CO)3] (H2'S2Se2' = 1,2-bis(2-thiabutyl-3,3-dimethyl-4-selenol)benzene) has been synthesized by reacting the nickel selenolate complex [Ni('S2Se2')] with [<span class="hlt">Fe</span>(CO)3bda] (bda = benzylideneacetone). X-ray crystal structure analysis confirms that [Ni<span class="hlt">Fe</span>('S2Se2')(CO)3] mimics the key structural features of the enzyme active site, including a doubly bridged heterobimetallic nickel and iron center with a selenolate terminally coordinated to the nickel center. Comparison of [Ni<span class="hlt">Fe</span>('S2Se2')(CO)3] with the previously reported thiolate analogue [Ni<span class="hlt">Fe</span>('S4')(CO)3] (H2'S4' = H2xbsms = 1,2-bis(4-mercapto-3,3-dimethyl-2-thiabutyl)benzene) showed that the selenolate groups in [Ni<span class="hlt">Fe</span>('S2Se2')(CO)3] give lower carbonyl stretching frequencies in the IR spectrum. Electrochemical studies of [Ni<span class="hlt">Fe</span>('S2Se2')(CO)3] and [Ni<span class="hlt">Fe</span>('S4')(CO)3] demonstrated that both complexes do not operate as homogenous H2 evolution catalysts, but are precursors to a solid deposit on an electrode surface for H2 evolution catalysis in organic and aqueous solution. © 2015 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1991JAP....69.5817P','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1991JAP....69.5817P"><span>A strong pinning <span class="hlt">model</span> for the coercivity of die-upset Pr-<span class="hlt">Fe</span>-B magnets</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Pinkerton, F. E.; fürst, C. D.</p> <p>1991-04-01</p> <p>We have measured the temperature dependence of the intrinsic coercivity Hci(T) between 5 and 565 K in a die-upset Pr-<span class="hlt">Fe</span>-B magnet. Over a very wide temperature range up to 477 K, Hci(T) is in excellent agreement with a <span class="hlt">model</span> for strong domain-wall pinning by a random array of pinning sites proposed by Gaunt [P. Gaunt, Philos. Mag. B 48, 261 (1983)]. The <span class="hlt">model</span> includes both the temperature dependence of the intrinsic magnetic properties of the Pr2<span class="hlt">Fe</span>14B phase and the effects of thermal activation of domain walls over the pinning barrier. The pinning sites are <span class="hlt">modeled</span> as nonmagnetic planar inhomogeneities at the boundaries between platelet-shaped Pr2<span class="hlt">Fe</span>14B grains. We develop an expression for the maximum pinning force per site, f, and derive the <span class="hlt">model</span> prediction that (Hci/γHA)1/2 varies linearly with (T/γ)2/3, where HA and γ are the magnetocrystalline anisotropy field and the domain-wall energy per unit area of the Pr2<span class="hlt">Fe</span>14B phase, respectively. Significant deviations from the <span class="hlt">model</span> are observed only at high temperature, suggesting that the strong pinning <span class="hlt">model</span> is no longer valid very close to the Curie temperature (565 K). The present result agrees with the <span class="hlt">model</span> fit obtained for a die-upset Nd-<span class="hlt">Fe</span>-B magnet.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/21296047','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/21296047"><span>On understanding proton transfer to the biocatalytic [<span class="hlt">Fe-Fe</span>](H) sub-cluster in [<span class="hlt">Fe-Fe</span>]H(2)ases: QM/MM MD simulations.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Hong, G; Cornish, A J; Hegg, E L; Pachter, R</p> <p>2011-05-01</p> <p>Proton transfer to the [<span class="hlt">Fe-Fe</span>](H) sub-cluster in the Desulfovibrio desulfuricans (DdH) and Clostridium pasteurianum (CpI) [<span class="hlt">Fe-Fe</span>] hydrogenases was investigated by a combination of first principles and empirical molecular dynamics simulations. Pathways that can be inferred from the X-ray crystal structures of DdH and CpI, i.e., (Glu159→Ser198→Glu156→water460→Cys178→DTMA([<span class="hlt">Fe-Fe</span>](H)) and (Glu282→Ser319→Glu279→water612→Cys299), respectively, were considered. Proton transfer from Cys178 to DTMA in the [<span class="hlt">Fe-Fe</span>](H) sub-cluster in DdH was readily observed in our results, specifically when [<span class="hlt">Fe-Fe</span>](H) was in the reduced state ([<span class="hlt">Fe(I)-Fe</span>(I)]) or in the mixed valence state for the protonated distal iron <span class="hlt">Fe</span>(d) ([<span class="hlt">Fe(I)-Fe</span>(II)-H(-)](H)). A concerted mechanism is proposed, where proton transfer in DdH from Glu159 to Glu156 via Ser198 and Glu156 to Cys178 via water460 readily occurred, as well as from Glu282 to Glu279 via Ser319 and Glu279 to Cys299 via water612 in CpI. The theoretical prediction of the proton transfer characteristics is consistent with the assumed biocatalytic mechanism of the [<span class="hlt">Fe-Fe</span>] hydrogenases in which the proton binds at <span class="hlt">Fe</span>(d), providing confirmation that has not been explored so far. The computational results were qualitatively validated by the agreement with experimental hydrogen production activity data for mutated CpI enzymes, relative to the wild-type protein. Finally, the insight provided by the simulations, combined, in <span class="hlt">part</span>, with experimental validation, are important for establishing an approach in future exploration of proton transfer to the active site in this class of enzymes, and possibly also for biomimetic analogs. Published by Elsevier B.V.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/27203801','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/27203801"><span>EIT image reconstruction based on a hybrid <span class="hlt">FE</span>-EFG forward method and the complete-electrode <span class="hlt">model</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Hadinia, M; Jafari, R; Soleimani, M</p> <p>2016-06-01</p> <p>This paper presents the application of the hybrid finite element-element free Galerkin (<span class="hlt">FE</span>-EFG) method for the forward and inverse problems of electrical impedance tomography (EIT). The proposed method is based on the complete electrode <span class="hlt">model</span>. Finite element (<span class="hlt">FE</span>) and element-free Galerkin (EFG) methods are accurate numerical techniques. However, the <span class="hlt">FE</span> technique has meshing task problems and the EFG method is computationally expensive. In this paper, the hybrid <span class="hlt">FE</span>-EFG method is applied to take both advantages of <span class="hlt">FE</span> and EFG methods, the complete electrode <span class="hlt">model</span> of the forward problem is solved, and an iterative regularized Gauss-Newton method is adopted to solve the inverse problem. The proposed method is applied to compute Jacobian in the inverse problem. Utilizing 2D circular homogenous <span class="hlt">models</span>, the numerical results are validated with analytical and experimental results and the performance of the hybrid <span class="hlt">FE</span>-EFG method compared with the <span class="hlt">FE</span> method is illustrated. Results of image reconstruction are presented for a human chest experimental phantom.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1258482-multi-scale-model-dislocation-plasticity-fe-incorporating-temperature-strain-rate-non-schmid-effects','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1258482-multi-scale-model-dislocation-plasticity-fe-incorporating-temperature-strain-rate-non-schmid-effects"><span>A multi-scale <span class="hlt">model</span> of dislocation plasticity in α-<span class="hlt">Fe</span>: Incorporating temperature, strain rate and non-Schmid effects</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Lim, H.; Hale, L. M.; Zimmerman, J. A.; ...</p> <p>2015-01-05</p> <p>In this study, we develop an atomistically informed crystal plasticity finite element (CP-<span class="hlt">FE</span>) <span class="hlt">model</span> for body-centered-cubic (BCC) α-<span class="hlt">Fe</span> that incorporates non-Schmid stress dependent slip with temperature and strain rate effects. Based on recent insights obtained from atomistic simulations, we propose a new constitutive <span class="hlt">model</span> that combines a generalized non-Schmid yield law with aspects from a line tension (LT) <span class="hlt">model</span> for describing activation enthalpy required for the motion of dislocation kinks. Atomistic calculations are conducted to quantify the non-Schmid effects while both experimental data and atomistic simulations are used to assess the temperature and strain rate effects. The parameterized constitutive equationmore » is implemented into a BCC CP-<span class="hlt">FE</span> <span class="hlt">model</span> to simulate plastic deformation of single and polycrystalline <span class="hlt">Fe</span> which is compared with experimental data from the literature. This direct comparison demonstrates that the atomistically informed <span class="hlt">model</span> accurately captures the effects of crystal orientation, temperature and strain rate on the flow behavior of siangle crystal <span class="hlt">Fe</span>. Furthermore, our proposed CP-<span class="hlt">FE</span> <span class="hlt">model</span> exhibits temperature and strain rate dependent flow and yield surfaces in polycrystalline <span class="hlt">Fe</span> that deviate from conventional CP-<span class="hlt">FE</span> <span class="hlt">models</span> based on Schmid's law.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/25234420','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/25234420"><span>A [Ni<span class="hlt">Fe</span>]hydrogenase <span class="hlt">model</span> that catalyses the release of hydrogen from formic acid.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Nguyen, Nga T; Mori, Yuki; Matsumoto, Takahiro; Yatabe, Takeshi; Kabe, Ryota; Nakai, Hidetaka; Yoon, Ki-Seok; Ogo, Seiji</p> <p>2014-11-11</p> <p>We report the decomposition of formic acid to hydrogen and carbon dioxide, catalysed by a NiRu complex originally developed as a [Ni<span class="hlt">Fe</span>]hydrogenase <span class="hlt">model</span>. This is the first example of H2 evolution, catalysed by a [Ni<span class="hlt">Fe</span>]hydrogenase <span class="hlt">model</span>, which does not require additional energy.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3910139','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3910139"><span>Effect of Layer Thickness in Selective Laser Melting on Microstructure of Al/5 wt.%<span class="hlt">Fe</span>2O3 Powder Consolidated <span class="hlt">Parts</span></span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Hao, Liang</p> <p>2014-01-01</p> <p>In situ reaction was activated in the powder mixture of Al/5 wt.%<span class="hlt">Fe</span>2O3 by using selective laser melting (SLM) to directly fabricate aluminium metal matrix composite <span class="hlt">parts</span>. The microstructural characteristics of these in situ consolidated <span class="hlt">parts</span> through SLM were investigated under the influence of thick powder bed, 75 μm layer thickness, and 50 μm layer thickness in various laser powers and scanning speeds. It was found that the layer thickness has a strong influence on microstructural outcome, mainly attributed to its impact on oxygen content of the matrix. Various microstructural features (such as granular, coralline-like, and particulate appearance) were observed depending on the layer thickness, laser power, and scanning speed. This was associated with various material combinations such as pure Al, Al-<span class="hlt">Fe</span> intermetallics, and Al(-<span class="hlt">Fe</span>) oxide phases formed after in situ reaction and laser rapid solidification. Uniformly distributed very fine particles could be consolidated in net-shape Al composite <span class="hlt">parts</span> by using lower layer thickness, higher laser power, and lower scanning speed. The findings contribute to the new development of advanced net-shape manufacture of Al composites by combining SLM and in situ reaction process. PMID:24526879</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_1");'>1</a></li> <li><a href="#" onclick='return showDiv("page_2");'>2</a></li> <li class="active"><span>3</span></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_3 --> <div id="page_4" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_2");'>2</a></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li class="active"><span>4</span></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="61"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017AGUFMSH43B2825R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017AGUFMSH43B2825R"><span><span class="hlt">Modeling</span> 13.3nm <span class="hlt">Fe</span> XXIII Flare Emissions Using the GOES-R EXIS Instrument</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Rook, H.; Thiemann, E.</p> <p>2017-12-01</p> <p>The solar EUV spectrum is dominated by atomic transitions in ionized atoms in the solar atmosphere. As solar flares evolve, plasma temperatures and densities change, influencing abundances of various ions, changing intensities of different EUV wavelengths observed from the sun. Quantifying solar flare spectral irradiance is important for constraining <span class="hlt">models</span> of Earth's atmosphere, improving communications quality, and controlling satellite navigation. However, high time cadence measurements of flare irradiance across the entire EUV spectrum were not available prior to the launch of SDO. The EVE MEGS-A instrument aboard SDO collected 0.1nm EUV spectrum data from 2010 until 2014, when the instrument failed. No current or future instrument is capable of similar high resolution and time cadence EUV observation. This necessitates a full EUV spectrum <span class="hlt">model</span> to study EUV phenomena at Earth. It has been recently demonstrated that one hot flare EUV line, such as the 13.3nm <span class="hlt">Fe</span> XXIII line, can be used to <span class="hlt">model</span> cooler flare EUV line emissions, filling the role of MEGS-A. Since unblended measurements of <span class="hlt">Fe</span> XXIII are typically unavailable, a proxy for the <span class="hlt">Fe</span> XXIII line must be found. In this study, we construct two <span class="hlt">models</span> of this line, first using the GOES 0.1-0.8nm soft x-ray (SXR) channel as the <span class="hlt">Fe</span> XXIII proxy, and second using a physics-based <span class="hlt">model</span> dependent on GOES emission measure and temperature data. We determine that the more sophisticated physics-based <span class="hlt">model</span> shows better agreement with <span class="hlt">Fe</span> XXIII measurements, although the simple proxy <span class="hlt">model</span> also performs well. We also conclude that the high correlation between <span class="hlt">Fe</span> XXIII emissions and the GOES 0.1-0.8nm band is because both emissions tend to peak near the GOES emission measure peak despite large differences in their contribution functions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26709740','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26709740"><span>Enhanced Stability of the <span class="hlt">Fe</span>(II)/Mn(II) State in a Synthetic <span class="hlt">Model</span> of Heterobimetallic Cofactor Assembly.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Kerber, William D; Goheen, Joshua T; Perez, Kaitlyn A; Siegler, Maxime A</p> <p>2016-01-19</p> <p>Heterobimetallic Mn/<span class="hlt">Fe</span> cofactors are found in the R2 subunit of class Ic ribonucleotide reductases (R2c) and R2-like ligand binding oxidases (R2lox). Selective cofactor assembly is due at least in <span class="hlt">part</span> to the thermodynamics of M(II) binding to the apoprotein. We report here equilibrium studies of <span class="hlt">Fe</span>(II)/Mn(II) discrimination in the biomimetic <span class="hlt">model</span> system H5(F-HXTA) (5-fluoro-2-hydroxy-1,3-xylene-α,α'-diamine-N,N,N',N'-tetraacetic acid). The homobimetallic F-HXTA complexes [<span class="hlt">Fe</span>(H2O)6][1]2·14H2O and [Mn(H2O)6][2]2·14H2O (1 = [<span class="hlt">Fe</span>(II)2(F-HXTA)(H2O)4](-); 2 = [Mn(II)2(F-HXTA)(H2O)4](-)) were characterized by single crystal X-ray diffraction. NMR data show that 1 retains its structure in solution (2 is NMR silent). Metal exchange is facile, and the heterobimetallic complex [<span class="hlt">Fe</span>(II)Mn(II)(F-HXTA)(H2O)4](-) (3) is formed from mixtures of 1 and 2. (19)F NMR was used to quantify 1 and 3 in the presence of excess M(II)(aq) at various metal ratios, and equilibrium constants for <span class="hlt">Fe</span>(II)/Mn(II) discrimination were calculated from these data. <span class="hlt">Fe</span>(II) is preferred over Mn(II) with K1 = 182 ± 13 for complete replacement (2 ⇌ 1). This relatively modest preference is attributed to a hard-soft acid-base mismatch between the divalent cations and the polycarboxylate ligand. The stepwise constants for replacement are K2 = 20.1 ± 1.3 (2 ⇌ 3) and K3 = 9.1 ± 1.1 (3 ⇌ 1). K2 > K3 demonstrates enhanced stability of the heterobimetallic state beyond what is expected for simple Mn(II) → <span class="hlt">Fe</span>(II) replacement. The relevance to <span class="hlt">Fe</span>(II)/Mn(II) discrimination in R2c and R2lox proteins is discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/24402840','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/24402840"><span>Synthesis and reactivity of mononuclear iron <span class="hlt">models</span> of [<span class="hlt">Fe</span>]-hydrogenase that contain an acylmethylpyridinol ligand.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Hu, Bowen; Chen, Dafa; Hu, Xile</p> <p>2014-02-03</p> <p>[<span class="hlt">Fe</span>]-hydrogenase has a single iron-containing active site that features an acylmethylpyridinol ligand. This unique ligand environment had yet to be reproduced in synthetic <span class="hlt">models</span>; however the synthesis and reactivity of a new class of small molecule mimics of [<span class="hlt">Fe</span>]-hydrogenase in which a mono-iron center is ligated by an acylmethylpyridinol ligand has now been achieved. Key to the preparation of these <span class="hlt">model</span> compounds is the successful C-O cleavage of an alkyl ether moiety to form the desired pyridinol ligand. Reaction of solvated complex [(2-CH2CO-6-HOC5H3N)<span class="hlt">Fe</span>(CO)2(CH3CN)2](+)(BF4)(-) with thiols or thiophenols in the presence of NEt3 yielded 5-coordinate iron thiolate complexes. Further derivation produced complexes [(2-CH2CO-6-HOC5H3N)<span class="hlt">Fe</span>(CO)2(SCH2CH2OH)] and [(2-CH2CO-6-HOC5H3N)<span class="hlt">Fe</span>(CO)2(CH3COO)], which can be regarded as <span class="hlt">models</span> of <span class="hlt">Fe</span>GP cofactors of [<span class="hlt">Fe</span>]-hydrogenase extracted by 2-mercaptoethanol and acetic acid, respectively. When the derivative complexes were treated with HBF4 ⋅Et2O, the solvated complex was regenerated by protonation of the thiolate ligands. The reactivity of several <span class="hlt">models</span> with CO, isocyanide, cyanide, and H2 was also investigated. Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017AGUFMDI43C..05R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017AGUFMDI43C..05R"><span><span class="hlt">Modeling</span> (Mg,<span class="hlt">Fe</span>)O creep at Lowermost Mantle conditions</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Reali, R.; Jackson, J. M.; Van Orman, J. A.; Carrez, P.; Cordier, P.</p> <p>2017-12-01</p> <p>The viscosity of the lower mantle results from the rheological behavior of its two main constituent minerals, aluminous (Mg,<span class="hlt">Fe</span>)SiO3 bridgmanite and (Mg,<span class="hlt">Fe</span>)O ferropericlase. Understanding the rheology of lower mantle aggregates is of primary importance in geophysics and it is a challenging task, due to the extreme time-varying conditions to which such aggregates are subjected.Here we focus on the creep behavior of (Mg,<span class="hlt">Fe</span>)O at the bottom of the lower mantle, where the presence of thermo-chemical anomalies such as ultralow-velocity zones (ULVZ) can significantly alter the composition and therefore the properties of this region. Two different iron concentrations of (Mg1-xFex)O are considered: one mirroring the average composition of ferropericlase throughout most of the lower mantle (x = 0.20) and another representing a candidate component of ULVZs near the base of the mantle (x = 0.84) [1]. The investigated pressure-temperature conditions span from 120 GPa and 2800 K, corresponding to the geotherm at this depth, to core-mantle conditions of 135 GPa and 3800 K.In this study, dislocation creep of (Mg,<span class="hlt">Fe</span>)O is investigated by Dislocation Dynamics (DD) simulations, a <span class="hlt">modeling</span> tool which considers the collective motion and interactions of dislocations. To <span class="hlt">model</span> their behavior, a 2.5 Dimensional Dislocation Dynamics approach (2.5D-DD) is employed. Within this method, both glide and climb mechanisms can be taken into account, and the interplay of these features results in a steady-state condition. This allows the retrieval of the creep strain rates at different temperatures, pressures, applied stresses and iron concentrations across the (Mg,<span class="hlt">Fe</span>)O solid solution, providing information on the viscosity for these materials. This numerical approach has been validated at ambient conditions, where it was benchmarked with respect to experimental data on MgO [2]. [1] J.K. Wicks, J.M. Jackson, W. Sturhahn and D. Zhang, GRL, 44, 2017.[2] R. Reali, F. Boioli, K. Gouriet, P. Carrez, B</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/23137095','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/23137095"><span>Repositioning the knee joint in human body <span class="hlt">FE</span> <span class="hlt">models</span> using a graphics-based technique.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Jani, Dhaval; Chawla, Anoop; Mukherjee, Sudipto; Goyal, Rahul; Vusirikala, Nataraju; Jayaraman, Suresh</p> <p>2012-01-01</p> <p>Human body finite element <span class="hlt">models</span> (<span class="hlt">FE</span>-HBMs) are available in standard occupant or pedestrian postures. There is a need to have <span class="hlt">FE</span>-HBMs in the same posture as a crash victim or to be configured in varying postures. Developing <span class="hlt">FE</span> <span class="hlt">models</span> for all possible positions is not practically viable. The current work aims at obtaining a posture-specific human lower extremity <span class="hlt">model</span> by reconfiguring an existing one. A graphics-based technique was developed to reposition the lower extremity of an <span class="hlt">FE</span>-HBM by specifying the flexion-extension angle. Elements of the <span class="hlt">model</span> were segregated into rigid (bones) and deformable components (soft tissues). The bones were rotated about the flexion-extension axis followed by rotation about the longitudinal axis to capture the twisting of the tibia. The desired knee joint movement was thus achieved. Geometric heuristics were then used to reposition the skin. A mapping defined over the space between bones and the skin was used to regenerate the soft tissues. Mesh smoothing was then done to augment mesh quality. The developed method permits control over the kinematics of the joint and maintains the initial mesh quality of the <span class="hlt">model</span>. For some critical areas (in the joint vicinity) where element distortion is large, mesh smoothing is done to improve mesh quality. A method to reposition the knee joint of a human body <span class="hlt">FE</span> <span class="hlt">model</span> was developed. Repositions of a <span class="hlt">model</span> from 9 degrees of flexion to 90 degrees of flexion in just a few seconds without subjective interventions was demonstrated. Because the mesh quality of the repositioned <span class="hlt">model</span> was maintained to a predefined level (typically to the level of a well-made <span class="hlt">model</span> in the initial configuration), the <span class="hlt">model</span> was suitable for subsequent simulations.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1238750-irradiation-enhanced-precipitation-model-fecral-alloys','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1238750-irradiation-enhanced-precipitation-model-fecral-alloys"><span>Irradiation-enhanced α' precipitation in <span class="hlt">model</span> <span class="hlt">Fe</span>CrAl alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Edmondson, Philip D.; Briggs, Samuel A.; Yamamoto, Yukinori; ...</p> <p>2016-02-17</p> <p>We have irradiated the <span class="hlt">model</span> <span class="hlt">Fe</span>CrAl alloys with varying compositions (<span class="hlt">Fe</span>(10–18)Cr(10–6)Al at.%) with a neutron at ~ 320 to damage levels of ~ 7 displacements per atom (dpa) to investigate the compositional influence on the formation of irradiation-induced Cr-rich α' precipitates using atom probe tomography. In all alloys, significant number densities of these precipitates were observed. Cluster compositions were investigated and it was found that the average cluster Cr content ranged between 51.1 and 62.5 at.% dependent on initial compositions. Furthermore, this is significantly lower than the Cr-content of α' in binary <span class="hlt">Fe</span>Cr alloys. As a result, significant partitioning ofmore » the Al from the α' precipitates was also observed.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016htmp.book..493Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016htmp.book..493Z"><span><span class="hlt">Modeling</span> and Recovery of Iron (<span class="hlt">Fe</span>) from Red Mud by Coal Reduction</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhao, Xiancong; Li, Hongxu; Wang, Lei; Zhang, Lifeng</p> <p></p> <p>Recovery of <span class="hlt">Fe</span> from red mud has been studied using statistically designed experiments. The effects of three factors, namely: reduction temperature, reduction time and proportion of additive on recovery of <span class="hlt">Fe</span> have been investigated. Experiments have been carried out using orthogonal central composite design and factorial design methods. A <span class="hlt">model</span> has been obtained through variance analysis at 92.5% confidence level.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/27047304','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/27047304"><span>Orientation relationship of eutectoid <span class="hlt">Fe</span>Al and <span class="hlt">Fe</span>Al2.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Scherf, A; Kauffmann, A; Kauffmann-Weiss, S; Scherer, T; Li, X; Stein, F; Heilmaier, M</p> <p>2016-04-01</p> <p><span class="hlt">Fe</span>-Al alloys in the aluminium range of 55-65 at.% exhibit a lamellar microstructure of B2-ordered <span class="hlt">Fe</span>Al and triclinic <span class="hlt">Fe</span>Al 2 , which is caused by a eutectoid decomposition of the high-temperature <span class="hlt">Fe</span> 5 Al 8 phase, the so-called ∊ phase. The orientation relationship of <span class="hlt">Fe</span>Al and <span class="hlt">Fe</span>Al 2 has previously been studied by Bastin et al. [ J. Cryst. Growth (1978 ▸), 43 , 745] and Hirata et al. [ Philos. Mag. Lett. (2008 ▸), 88 , 491]. Since both results are based on different crystallographic data regarding <span class="hlt">Fe</span>Al 2 , the data are re-evaluated with respect to a recent re-determination of the <span class="hlt">Fe</span>Al 2 phase provided by Chumak et al. [ Acta Cryst. (2010 ▸), C 66 , i87]. It is found that both orientation relationships match subsequent to a rotation operation of 180° about a 〈112〉 crystallographic axis of <span class="hlt">Fe</span>Al or by applying the inversion symmetry of the <span class="hlt">Fe</span>Al 2 crystal structure as suggested by the Chumak data set. Experimental evidence for the validity of the previously determined orientation relationships was found in as-cast fully lamellar material (random texture) as well as directionally solidified material (∼〈110〉 <span class="hlt">Fe</span>Al || solidification direction) by means of orientation imaging microscopy and global texture measurements. In addition, a preferential interface between <span class="hlt">Fe</span>Al and <span class="hlt">Fe</span>Al 2 was identified by means of trace analyses using cross sectioning with a focused ion beam. On the basis of these habit planes the orientation relationship between the two phases can be described by ([Formula: see text]01) <span class="hlt">Fe</span>Al || (114)[Formula: see text] and [111] <span class="hlt">Fe</span>Al || [1[Formula: see text]0][Formula: see text]. There is no evidence for twinning within <span class="hlt">Fe</span>Al lamellae or alternating orientations of <span class="hlt">Fe</span>Al lamellae. Based on the determined orientation and interface data, an atomistic <span class="hlt">model</span> of the structure relationship of <span class="hlt">Fe</span> 5 Al 8 , <span class="hlt">Fe</span>Al and <span class="hlt">Fe</span>Al 2 in the vicinity of the eutectoid decomposition is derived. This <span class="hlt">model</span> is analysed with respect to the strain which has to be</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016ApPhL.109t3110J','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016ApPhL.109t3110J"><span><span class="hlt">Modeling</span> Verwey transition temperature of <span class="hlt">Fe</span>3O4 nanocrystals</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Jiang, Xiao bao; Xiao, Bei bei; Yang, Hong yu; Gu, Xiao yan; Sheng, Hong chao; Zhang, Xing hua</p> <p>2016-11-01</p> <p>The Verwey transition in nanoscale is an important physical property for <span class="hlt">Fe</span>3O4 nanocrystals and has attracted extensive attention in recent years. In this work, an analytic thermodynamic <span class="hlt">model</span> without any adjusting parameters is developed to estimate the size and shape effects on modulating the Verwey transition temperature of <span class="hlt">Fe</span>3O4 nanocrystals. The results show that the Verwey transition temperature reduces with increasing shape parameter λ or decreasing size D. A good agreement between the prediction and the experimental data verified our physical insight that the Verwey transition of <span class="hlt">Fe</span>3O4 can be directly related to the atomic thermal vibration. The results presented in this work will be of benefit to the understanding of the microscopic mechanism of the Verwey transition and the design of future generation switching and memory devices.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/29169090','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/29169090"><span>Optimization of <span class="hlt">Fe</span>2+ supplement in anaerobic digestion accounting for the <span class="hlt">Fe</span>-bioavailability.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Cai, Yafan; Zhao, Xiaoling; Zhao, Yubin; Wang, Hongliang; Yuan, Xufeng; Zhu, Wanbin; Cui, Zongjun; Wang, Xiaofen</p> <p>2018-02-01</p> <p><span class="hlt">Fe</span> is widely used as an additive in anaerobic digestion, but its bioavailability and the mechanism by which it enhances digestion are unclear. In this study, sequential extraction was used to measure <span class="hlt">Fe</span> bioavailability, while biochemical parameters, kinetics <span class="hlt">model</span> and Q-PCR (fluorescence quantitative PCR) were used to explore its mechanism of stimulation. The results showed that sequential extraction is a suitable method to assess the anaerobic system bioavailability of <span class="hlt">Fe</span>, which is low and fluctuates to a limited extent (1.7 to -3.1wt%), indicating that it would be easy for <span class="hlt">Fe</span> levels to be insufficient. Methane yield increased when the added <span class="hlt">Fe</span> 2+ was 10-500mg/L. Appropriate amounts of <span class="hlt">Fe</span> 2+ accelerated the decomposition of rice straw and facilitated methanogen metabolism, thereby improving reactor performance. The modified Gompertz <span class="hlt">model</span> better fitted the results than the first-order kinetic <span class="hlt">model</span>. Feasibility analysis showed that addition of <span class="hlt">Fe</span> 2+ at ≤50mg/L was suitable. Copyright © 2017. Published by Elsevier Ltd.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/28831157','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/28831157"><span>Composition formulas of <span class="hlt">Fe</span>-based transition metals-metalloid bulk metallic glasses derived from dual-cluster <span class="hlt">model</span> of binary eutectics.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Naz, Gul Jabeen; Dong, Dandan; Geng, Yaoxiang; Wang, Yingmin; Dong, Chuang</p> <p>2017-08-22</p> <p>It is known that bulk metallic glasses follow simple composition formulas [cluster](glue atom) 1 or 3 with 24 valence electrons within the framework of the cluster-plus-glue-atom <span class="hlt">model</span>. Though the relevant nearest-neighbor cluster can be readily identified from a devitrification phase, the glue atoms remains poorly defined. The present work is devoted to understanding the composition rule of <span class="hlt">Fe</span>-(B,P,C) based multi-component bulk metallic glasses, by introducing a cluster-based eutectic liquid <span class="hlt">model</span>. This <span class="hlt">model</span> regards a eutectic liquid to be composed of two stable liquids formulated respectively by cluster formulas for ideal metallic glasses from the two eutectic phases. The dual cluster formulas are first established for binary <span class="hlt">Fe</span>-(B,C,P) eutectics: [<span class="hlt">Fe-Fe</span> 14 ]B 2 Fe + [B-B 2 <span class="hlt">Fe</span> 8 ]<span class="hlt">Fe</span> ≈ <span class="hlt">Fe</span> 83.3 B 16.7 for eutectic <span class="hlt">Fe</span> 83 B 17 , [P-<span class="hlt">Fe</span> 14 ]P + [P-<span class="hlt">Fe</span> 9 ]P 2 Fe≈<span class="hlt">Fe</span> 82.8 P 17.2 for <span class="hlt">Fe</span> 83 P 17 , and [C-<span class="hlt">Fe</span> 6 ]<span class="hlt">Fe</span> 3  + [C-<span class="hlt">Fe</span> 9 ]C 2 Fe ≈ <span class="hlt">Fe</span> 82.6 C 17.4 for <span class="hlt">Fe</span> 82.7 C 17.3 . The second formulas in these dual-cluster formulas, being respectively relevant to devitrification phases <span class="hlt">Fe</span> 2 B, <span class="hlt">Fe</span> 3 P, and <span class="hlt">Fe</span> 3 C, well explain the compositions of existing <span class="hlt">Fe</span>-based transition metals-metalloid bulk metallic glasses. These formulas also satisfy the 24-electron rule. The proposition of the composition formulas for good glass formers, directly from known eutectic points, constitutes a new route towards understanding and eventual designing metallic glasses of high glass forming abilities.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/24422466','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/24422466"><span>Redox reactions of [<span class="hlt">FeFe</span>]-hydrogenase <span class="hlt">models</span> containing an internal amine and a pendant phosphine.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Zheng, Dehua; Wang, Mei; Chen, Lin; Wang, Ning; Sun, Licheng</p> <p>2014-02-03</p> <p>A diiron dithiolate complex with a pendant phosphine coordinated to one of the iron centers, [(μ-SCH2)2N(CH2C6H4-o-PPh2){<span class="hlt">Fe</span>2(CO)5}] (1), was prepared and structurally characterized. The pendant phosphine is dissociated together with a CO ligand in the presence of excess PMe3, to afford [(μ-SCH2)2N(CH2C6H4-o-PPh2){<span class="hlt">Fe</span>(CO)2(PMe3)}2] (2). Redox reactions of 2 and related complexes were studied in detail by in situ IR spectroscopy. A series of new <span class="hlt">Fe(II)Fe</span>(I) ([3](+) and [6](+)), <span class="hlt">Fe(II)Fe</span>(II) ([4](2+)), and <span class="hlt">Fe(I)Fe</span>(I) (5) complexes relevant to Hox, Hox(CO), and Hred states of the [<span class="hlt">FeFe</span>]-hydrogenase active site were detected. Among these complexes, the molecular structures of the diferrous complex [4](2+) with the internal amine and the pendant phosphine co-coordinated to the same iron center and the triphosphine diiron complex 5 were determined by X-ray crystallography. To make a comparison, the redox reactions of an analogous complex, [(μ-SCH2)2N(CH2C6H5){<span class="hlt">Fe</span>(CO)2(PMe3)}2] (7), were also investigated by in situ IR spectroscopy in the absence or presence of extrinsic PPh3, which has no influence on the oxidation reaction of 7. The pendant phosphine in the second coordination sphere makes the redox reaction of 2 different from that of its analogue 7.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014JMMM..365...45S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014JMMM..365...45S"><span>Micromagnetic finite element simulation of nanocrystalline α-<span class="hlt">Fe</span>/Nd2<span class="hlt">Fe</span>14B/<span class="hlt">Fe</span>3B magnets</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Saiden, N. M.; Schrefl, T.; Davies, H. A.; Hrkac, G.</p> <p>2014-09-01</p> <p>Nanocomposite Nd2<span class="hlt">Fe</span>14B permanent magnets with <span class="hlt">Fe</span>3B and α-<span class="hlt">Fe</span> as the soft phase have been simulated using micromagnetic <span class="hlt">modelling</span>. This paper reviews extensively the results from the simulation point of view. The magnetization configuration along the hysteresis loop is discussed in details. It was clear that the grain size and phase distribution play important roles in determining the magnetic properties. By changing the size of the grain and the volume fraction of the hard and soft phase, the magnetic properties change and the relationship between microstructure and properties is investigated. The remanence, Jr increases with decreasing of grain size, but oppositely for coercivity, Hc. The highest Jr, 1.46 T was obtained with a grain size 10 nm, and volume fraction of α-<span class="hlt">Fe</span>, 40%. Whereas, the highest Hc with combination Nd2<span class="hlt">Fe</span>14B 80% and 20% <span class="hlt">Fe</span>3B, 947 kA/m. On the other hand, if Nd2<span class="hlt">Fe</span>14B alone, the Hc able to reach up to 1000 kA/m. From this study, micromagnetic <span class="hlt">modelling</span> contributes to a better understanding how microstructure and phase distribution influences the magnetic properties.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009PhRvC..80c4305O','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009PhRvC..80c4305O"><span>Test of level density <span class="hlt">models</span> from reactions of Li6 on <span class="hlt">Fe</span>58 and Li7 on <span class="hlt">Fe</span>57</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Oginni, B. M.; Grimes, S. M.; Voinov, A. V.; Adekola, A. S.; Brune, C. R.; Carter, D. E.; Heinen, Z.; Jacobs, D.; Massey, T. N.; O'Donnell, J. E.; Schiller, A.</p> <p>2009-09-01</p> <p>The reactions of Li6 on <span class="hlt">Fe</span>58 and Li7 on <span class="hlt">Fe</span>57 have been studied at 15 MeV beam energy. These two reactions produce the same compound nucleus, Cu64. The charged particle spectra were measured at backward angles. The data obtained have been compared with Hauser-Feshbach <span class="hlt">model</span> calculations. The level density parameters of Ni63 and Co60 have been obtained from the particle evaporation spectra. We also find contributions from the break up of the lithium projectiles to the low energy region of the α spectra.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018JaJAP..57a3001H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018JaJAP..57a3001H"><span>Interface perpendicular magnetic anisotropy in ultrathin Ta/Ni<span class="hlt">Fe</span>/Pt layered structures</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hirayama, Shigeyuki; Kasai, Shinya; Mitani, Seiji</p> <p>2018-01-01</p> <p>Interface perpendicular magnetic anisotropy (PMA) in ultrathin Ta/Ni<span class="hlt">Fe</span>/Pt layered structures was investigated through magnetization measurements. Ta/Ni<span class="hlt">Fe</span>/Pt films with Ni<span class="hlt">Fe</span> layer thickness (t) values of 2 nm or more showed typical in-plane magnetization curves, which was presumably due to the dominant contribution of the shape magnetic anisotropy. The thickness dependence of the saturation magnetization of the entire Ni<span class="hlt">Fe</span> layer (M s) was well analyzed using the so-called dead-layer <span class="hlt">model</span>, showing that the magnetically active <span class="hlt">part</span> of the Ni<span class="hlt">Fe</span> layer has saturation magnetization (M\\text{s}\\text{act}) independent of t and comparable to the bulk value. In the perpendicular direction, the saturation field H k was found to clearly decrease with decreasing t, while the effective field of shape magnetic anisotropy due to the active Ni<span class="hlt">Fe</span> saturation magnetization M\\text{s}\\text{act} should be independent of t. These observations show that there exists interface PMA in the layered structures. The interface PMA energy density was determined to be ∼0.17 erg/cm2 using the dead-layer <span class="hlt">model</span>. Motivated by the correlation observed between M s and H k, we also attempted to interpret the experimental results using an alternative approach beyond the dead-layer <span class="hlt">model</span>; however, it gives only implications on the incomplete validity of the dead-layer <span class="hlt">model</span> and no better understanding.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20140013190','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20140013190"><span>Astronaut Bone Medical Standards Derived from Finite Element (<span class="hlt">FE</span>) <span class="hlt">Models</span> of QCT Scans from Population Studies</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Sibonga, J. D.; Feiveson, A. H.</p> <p>2014-01-01</p> <p>This work was accomplished in support of the Finite Element [<span class="hlt">FE</span>] Strength Task Group, NASA Johnson Space Center [JSC], Houston, TX. This group was charged with the task of developing rules for using finite-element [<span class="hlt">FE</span>] bone-strength measures to construct operating bands for bone health that are relevant to astronauts following exposure to spaceflight. <span class="hlt">FE</span> <span class="hlt">modeling</span> is a computational tool used by engineers to estimate the failure loads of complex structures. Recently, some engineers have used this tool to characterize the failure loads of the hip in population studies that also monitored fracture outcomes. A Directed Research Task was authorized in July, 2012 to investigate <span class="hlt">FE</span> data from these population studies to derive these proposed standards of bone health as a function of age and gender. The proposed standards make use of an <span class="hlt">FE</span>-based index that integrates multiple contributors to bone strength, an expanded evaluation that is critical after an astronaut is exposed to spaceflight. The current index of bone health used by NASA is the measurement of areal BMD. There was a concern voiced by a research and clinical advisory panel that the sole use of areal BMD would be insufficient to fully evaluate the effects of spaceflight on the hip. Hence, NASA may not have a full understanding of fracture risk, both during and after a mission, and may be poorly estimating in-flight countermeasure efficacy. The <span class="hlt">FE</span> Strength Task Group - composed of principal investigators of the aforementioned population studies and of <span class="hlt">FE</span> <span class="hlt">modelers</span> -donated some of its population QCT data to estimate of hip bone strength by <span class="hlt">FE</span> <span class="hlt">modeling</span> for this specific purpose. Consequently, Human Health Countermeasures [HHC] has compiled a dataset of <span class="hlt">FE</span> hip strengths, generated by a single <span class="hlt">FE</span> <span class="hlt">modeling</span> approach, from human subjects (approx.1060) with ages covering the age range of the astronauts. The dataset has been analyzed to generate a set of <span class="hlt">FE</span> strength cutoffs for the following scenarios: a) Qualify an</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://ntrs.nasa.gov/search.jsp?R=19870064649&hterms=donation&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Ddonation','NASA-TRS'); return false;" href="https://ntrs.nasa.gov/search.jsp?R=19870064649&hterms=donation&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Ddonation"><span>The bonding of <span class="hlt">Fe</span>N2, <span class="hlt">Fe</span>CO, and <span class="hlt">Fe</span>2N2 - <span class="hlt">Model</span> systems for side-on bonding of CO and N2</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Bauschlicher, Charles W., Jr.; Pettersson, Lars G. M.; Siegbahn, Per E. M.</p> <p>1987-01-01</p> <p>Qualitative calculations are performed to elucidate the nature of the side-on interaction of both N2 and CO with a single <span class="hlt">Fe</span> atom. The systems are found to be quite similar, with bonding leading to an increase in the CO or N2 bond length and a decrease in the vibrational frequency. The CO or N2 stretching modes lead to a large dipole derivative along the metal-ligand bond axis. The populations show an almost identical, large donation from the <span class="hlt">Fe</span> 3d orbitals into the CO or N2 Pi-asterisk. The larger system <span class="hlt">Fe</span>2N2 is then considered, with the N2 bridging the <span class="hlt">Fe</span>2, both parallel and perpendicular to the <span class="hlt">Fe</span>2 bond axis for two different <span class="hlt">Fe-Fe</span> distances. For <span class="hlt">Fe</span>N2, the shift in the observed N2 frequency is smaller than observed for the alpha state of N2/<span class="hlt">Fe</span>(111). The shift in the N2 vibrational frequency increases when the N2 interacts with two <span class="hlt">Fe</span> atoms, either at the <span class="hlt">Fe-Fe</span> nearest neighbor distance or at the first layer <span class="hlt">Fe-Fe</span> distance, when the side-on N2 axis is oriented perpendicular to an <span class="hlt">Fe-Fe</span> bond.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1994JAP....75.6187H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1994JAP....75.6187H"><span>``Loose spins'' in <span class="hlt">Fe/Cu/Fe</span>(001) structures</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Heinrich, B.; Celinski, Z.; Liao, L. X.; From, M.; Cochran, J. F.</p> <p>1994-05-01</p> <p>Slonczewski recently proposed a <span class="hlt">model</span> for the exchange coupling between ferromagnetic layers separated by a nonferromagnetic spacer based on the concept of ``loose spins.'' ``Loose spins'' contribute to the total exchange energy. We have studied the role of ``loose spins'' in bcc <span class="hlt">Fe/Cu/Fe</span>(001) structures. bcc <span class="hlt">Fe/Cu/Fe</span>(001) trilayers deposited at room temperature were investigated extensively in our previous studies. In our ``loose spin'' studies, the <span class="hlt">Fe</span> was added inside the Cu interlayer. Several structures were atomically engineered in order to test the behavior of ``loose spins:'' One additional atomic layer of an (<span class="hlt">Fe</span>+Cu) alloy were located in appropriate positions in a Cu spacer. The bilinear and biquadratic exchange coupling in the above structures was quantitatively studied with FMR in the temperature range 77-370 K and with MOKE at RT.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/21512916','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/21512916"><span>Development and validation of age-dependent <span class="hlt">FE</span> human <span class="hlt">models</span> of a mid-sized male thorax.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>El-Jawahri, Raed E; Laituri, Tony R; Ruan, Jesse S; Rouhana, Stephen W; Barbat, Saeed D</p> <p>2010-11-01</p> <p>The increasing number of people over 65 years old (YO) is an important research topic in the area of impact biomechanics, and finite element (<span class="hlt">FE</span>) <span class="hlt">modeling</span> can provide valuable support for related research. There were three objectives of this study: (1) Estimation of the representative age of the previously-documented Ford Human Body <span class="hlt">Model</span> (FHBM) -- an <span class="hlt">FE</span> <span class="hlt">model</span> which approximates the geometry and mass of a mid-sized male, (2) Development of <span class="hlt">FE</span> <span class="hlt">models</span> representing two additional ages, and (3) Validation of the resulting three <span class="hlt">models</span> to the extent possible with respect to available physical tests. Specifically, the geometry of the <span class="hlt">model</span> was compared to published data relating rib angles to age, and the mechanical properties of different simulated tissues were compared to a number of published aging functions. The FHBM was determined to represent a 53-59 YO mid-sized male. The aforementioned aging functions were used to develop <span class="hlt">FE</span> <span class="hlt">models</span> representing two additional ages: 35 and 75 YO. The rib <span class="hlt">model</span> was validated against human rib specimens and whole rib tests, under different loading conditions, with and without <span class="hlt">modeled</span> fracture. In addition, the resulting three age-dependent <span class="hlt">models</span> were validated by simulating cadaveric tests of blunt and sled impacts. The responses of the <span class="hlt">models</span>, in general, were within the cadaveric response corridors. When compared to peak responses from individual cadavers similar in size and age to the age-dependent <span class="hlt">models</span>, some responses were within one standard deviation of the test data. All the other responses, but one, were within two standard deviations.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009PhRvB..80j4440N','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009PhRvB..80j4440N"><span><span class="hlt">Model</span> many-body Stoner Hamiltonian for binary <span class="hlt">Fe</span>Cr alloys</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Nguyen-Manh, D.; Dudarev, S. L.</p> <p>2009-09-01</p> <p>We derive a <span class="hlt">model</span> tight-binding many-body d -electron Stoner Hamiltonian for <span class="hlt">Fe</span>Cr binary alloys and investigate the sensitivity of its mean-field solutions to the choice of hopping integrals and the Stoner exchange parameters. By applying the local charge-neutrality condition within a self-consistent treatment we show that the negative enthalpy-of-mixing anomaly characterizing the alloy in the low chromium concentration limit is due entirely to the presence of the on-site exchange Stoner terms and that the occurrence of this anomaly is not specifically related to the choice of hopping integrals describing conventional chemical bonding between atoms in the alloy. The Bain transformation pathway computed, using the proposed <span class="hlt">model</span> Hamiltonian, for the <span class="hlt">Fe</span>15Cr alloy configuration is in excellent agreement with ab initio total-energy calculations. Our investigation also shows how the parameters of a tight-binding many-body <span class="hlt">model</span> Hamiltonian for a magnetic alloy can be derived from the comparison of its mean-field solutions with other, more accurate, mean-field approximations (e.g., density-functional calculations), hence stimulating the development of large-scale computational algorithms for <span class="hlt">modeling</span> radiation damage effects in magnetic alloys and steels.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_2");'>2</a></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li class="active"><span>4</span></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_4 --> <div id="page_5" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li class="active"><span>5</span></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="81"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1431013-finite-element-simulation-compression-molding-woven-fabric-carbon-fiber-epoxy-composites-part-material-model-development','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1431013-finite-element-simulation-compression-molding-woven-fabric-carbon-fiber-epoxy-composites-part-material-model-development"><span>Finite Element Simulation of Compression Molding of Woven Fabric Carbon Fiber/Epoxy Composites: <span class="hlt">Part</span> I Material <span class="hlt">Model</span> Development</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Li, Yang; Zhao, Qiangsheng; Mirdamadi, Mansour; ...</p> <p>2016-01-06</p> <p>Woven fabric carbon fiber/epoxy composites made through compression molding are one of the promising choices of material for the vehicle light-weighting strategy. Previous studies have shown that the processing conditions can have substantial influence on the performance of this type of the material. Therefore the optimization of the compression molding process is of great importance to the manufacturing practice. An efficient way to achieve the optimized design of this process would be through conducting finite element (<span class="hlt">FE</span>) simulations of compression molding for woven fabric carbon fiber/epoxy composites. However, performing such simulation remains a challenging task for <span class="hlt">FE</span> as multiple typesmore » of physics are involved during the compression molding process, including the epoxy resin curing and the complex mechanical behavior of woven fabric structure. In the present study, the <span class="hlt">FE</span> simulation of the compression molding process of resin based woven fabric composites at continuum level is conducted, which is enabled by the implementation of an integrated material <span class="hlt">modeling</span> methodology in LS-Dyna. Specifically, the chemo-thermo-mechanical problem of compression molding is solved through the coupling of three material <span class="hlt">models</span>, i.e., one thermal <span class="hlt">model</span> for temperature history in the resin, one mechanical <span class="hlt">model</span> to update the curing-dependent properties of the resin and another mechanical <span class="hlt">model</span> to simulate the behavior of the woven fabric composites. Preliminary simulations of the carbon fiber/epoxy woven fabric composites in LS-Dyna are presented as a demonstration, while validations and <span class="hlt">models</span> with real <span class="hlt">part</span> geometry are planned in the future work.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/27570373','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/27570373"><span><span class="hlt">Modeling</span> diffusion-governed solidification of ternary alloys - <span class="hlt">Part</span> 2: Macroscopic transport phenomena and macrosegregation.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Wu, M; Li, J; Ludwig, A; Kharicha, A</p> <p>2014-09-01</p> <p><span class="hlt">Part</span> 1 of this two-<span class="hlt">part</span> investigation presented a multiphase solidification <span class="hlt">model</span> incorporating the finite diffusion kinetics and ternary phase diagram with the macroscopic transport phenomena (Wu et al., 2013). In <span class="hlt">Part</span> 2, the importance of proper treatment of the finite diffusion kinetics in the calculation of macrosegregation is addressed. Calculations for a two-dimensional (2D) square casting (50 × 50 mm 2 ) of <span class="hlt">Fe</span>-0.45 wt.%C-1.06 wt.%Mn considering thermo-solutal convection and crystal sedimentation are performed. The <span class="hlt">modeling</span> result indicates that the infinite liquid mixing kinetics as assumed by classical <span class="hlt">models</span> (e.g., the Gulliver-Scheil or lever rule), which cannot properly consider the solute enrichment of the interdendritic or inter-granular melt at the early stage of solidification, might lead to an erroneous estimation of the macrosegregation. To confirm this statement, further theoretical and experimental evaluations are desired. The pattern and intensity of the flow and crystal sedimentation are dependent on the crystal morphologies (columnar or equiaxed); hence, the potential error of the calculated macrosegregation caused by the assumed growth kinetics depends on the crystal morphology. Finally, an illustrative simulation of an engineering 2.45-ton steel ingot is performed, and the results are compared with experimental results. This example demonstrates the <span class="hlt">model</span> applicability for engineering castings regarding both the calculation efficiency and functionality.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2008JPS...177..595M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2008JPS...177..595M"><span>Thermal activated ("thermal") battery technology. <span class="hlt">Part</span> IIIa: <span class="hlt">Fe</span>S 2 cathode material</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Masset, Patrick J.; Guidotti, Ronald A.</p> <p></p> <p>This article presents an overview of the pyrite <span class="hlt">Fe</span>S 2 used as cathode material in thermally activated ("thermal") batteries. A large emphasis was placed on the physicochemical properties and electrochemical performance of the pyrite <span class="hlt">Fe</span>S 2, including the discharge mechanisms, self-discharge phenomena, and recent developments.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/28829123','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/28829123"><span>Revisiting the Electronic Structure of <span class="hlt">Fe</span>S Monomers Using ab Initio Ligand Field Theory and the Angular Overlap <span class="hlt">Model</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Chilkuri, Vijay Gopal; DeBeer, Serena; Neese, Frank</p> <p>2017-09-05</p> <p>Iron-sulfur (<span class="hlt">Fe</span>S) proteins are universally found in nature with actives sites ranging in complexity from simple monomers to multinuclear sites from two up to eight iron atoms. These sites include mononuclear (rubredoxins), dinuclear (ferredoxins and Rieske proteins), trinuclear (e.g., hydrogenases), and tetranuclear (various ferredoxins and high-potential iron-sulfur proteins). The electronic structure of the higher-nuclearity clusters is inherently extremely complex. Hence, it is reasonable to take a bottom-up approach in which clusters of increasing nuclearity are analyzed in terms of the properties of their lower nuclearity constituents. In the present study, the first step is taken by an in-depth analysis of mononuclear <span class="hlt">Fe</span>S systems. Two different <span class="hlt">Fe</span>S molecules with phenylthiolate and methylthiolate as ligands are studied in their oxidized and reduced forms using modern wave function-based ab initio methods. The ab initio electronic spectra and wave function are presented and analyzed in detail. The very intricate electronic structure-geometry relationship in these systems is analyzed using ab initio ligand field theory (AILFT) in conjunction with the angular overlap <span class="hlt">model</span> (AOM) parametrization scheme. The simple AOM <span class="hlt">model</span> is used to explain the effect of geometric variations on the electronic structure. Through a comparison of the ab initio computed UV-vis absorption spectra and the available experimental spectra, the low-energy <span class="hlt">part</span> of the many-particle spectrum is carefully analyzed. We show ab initio calculated magnetic circular dichroism spectra and present a comparison with the experimental spectrum. Finally, AILFT parameters and the ab initio spectra are compared with those obtained experimentally to understand the effect of the increased covalency of the thiolate ligands on the electronic structure of <span class="hlt">Fe</span>S monomers.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018RJPCA..92..829A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018RJPCA..92..829A"><span>Analysis of the Glass-Forming Ability of <span class="hlt">Fe</span>-Er Alloys, Based on Thermodynamic <span class="hlt">Modeling</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Arutyunyan, N. A.; Zaitsev, A. I.; Dunaev, S. F.; Kalmykov, K. B.; El'nyakov, D. D.; Shaposhnikov, N. G.</p> <p>2018-05-01</p> <p>The <span class="hlt">Fe</span>-Er phase diagram and thermodynamic properties of all its phases are assessed by means of self-consistent analysis. To refine the data on phase equilibria in the <span class="hlt">Fe</span>-Er system, an investigation is performed in the 10-40 at % range of Er concentrations. The temperature-concentration dependences of the thermodynamic properties of a melt are presented using the <span class="hlt">model</span> of ideal associated solutions. Thermodynamic parameters of each phase are obtained, and the calculated results are in agreement with available experimental data. The correlation between the thermodynamic properties of liquid <span class="hlt">Fe</span>-Er alloys and their tendency toward amorphization are studied. It is shown that compositions of amorphous alloys prepared by melt quenching coincide with the ranges of concentration with the predominance of <span class="hlt">Fe</span>3Er and <span class="hlt">Fe</span>Er2 associative groups that have large negative entropies of formation.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3432505','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3432505"><span>Connecting [Ni<span class="hlt">Fe</span>]- and [<span class="hlt">FeFe</span>]-Hydrogenases: Mixed-Valence Nickel-Iron Dithiolates With Rotated Structures</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Schilter, David; Rauchfuss, Thomas B.; Stein, Matthias</p> <p>2012-01-01</p> <p>A series of mixed-valence iron-nickel dithiolates is described that exhibits structures similar to those of mixed-valence diiron dithiolates. Interaction of tricarbonyl salt [(dppe)Ni(pdt)<span class="hlt">Fe</span>(CO)3]BF4 ([1]BF4, dppe = Ph2PCH2CH2PPh2, pdtH2 = HSCH2CH2CH2SH) with P-donor ligands (L) afforded the substituted derivatives [(dppe)Ni(pdt)<span class="hlt">Fe</span>(CO)2L]BF4 incorporating L = PHCy2 ([1a]BF4), PPh(NEt2)2 ([1b]BF4), P(NMe2)3 ([1c]BF4), P(i-Pr)3 ([1d]BF4) and PCy3 ([1e]BF4). The related precursor [(dcpe)Ni(pdt)<span class="hlt">Fe</span>(CO)3]BF4 ([2]BF4, dcpe = Cy2PCH2CH2PCy2) gave the more electron-rich family of compounds [(dcpe)Ni(pdt)<span class="hlt">Fe</span>(CO)2L]BF4 for L = PPh2(2-pyridyl) ([2a]BF4), PPh3 ([2b]BF4) and PCy3 ([2c]BF4). For bulky and strongly basic monophosphorus ligands, the salts feature distorted <span class="hlt">Fe</span> coordination geometries: crystallographic analyses of [1e]BF4 and [2c]BF4 showed they adopt ‘rotated’ <span class="hlt">Fe</span>(I) centers, in which PCy3 occupies a basal site and one CO ligand partially bridges the Ni and <span class="hlt">Fe</span> centers. Like the undistorted mixed-valence derivatives, the new class of complexes are described as Ni(II)<span class="hlt">Fe</span>(I) (S = ½) systems according to EPR spectroscopy, although with attenuated 31P hyperfine interactions. DFT calculations using the BP86, B3LYP, and PBE0 exchange-correlation functionals agree with the structural and spectroscopic data, suggesting that the spin for [1e]+ is localized in a <span class="hlt">Fe</span>(I)-centered d(z2) orbital, orthogonal to the <span class="hlt">Fe</span>-P bond. The PCy3 complexes, rare examples of species featuring ‘rotated’ <span class="hlt">Fe</span> centers, both structurally and spectroscopically resemble mixed-valence diiron dithiolates. Also reproducing the NiS2<span class="hlt">Fe</span> core of the [Ni<span class="hlt">Fe</span>]-H2ase active site, the hybrid <span class="hlt">models</span> incorporate key features of the two major classes of H2ase. Furthermore, cyclic voltammetry experiments suggest that the highly basic phosphine ligands enable a second oxidation corresponding to the couple [(dxpe)Ni(pdt)<span class="hlt">Fe</span>(CO)2L]+/2+. The resulting unsaturated 32e− dications represent the closest approach to</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011AGUFM.H51C1214S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011AGUFM.H51C1214S"><span>Reactive Transport <span class="hlt">Modeling</span> of Microbe-mediated <span class="hlt">Fe</span> (II) Oxidation for Enhanced Oil Recovery</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Surasani, V.; Li, L.</p> <p>2011-12-01</p> <p>Microbially Enhanced Oil Recovery (MEOR) aims to improve the recovery of entrapped heavy oil in depleted reservoirs using microbe-based technology. Reservoir ecosystems often contain diverse microbial communities those can interact with subsurface fluids and minerals through a network of nutrients and energy fluxes. Microbe-mediated reactions products include gases, biosurfactants, biopolymers those can alter the properties of oil and interfacial interactions between oil, brine, and rocks. In addition, the produced biomass and mineral precipitates can change the reservoir permeability profile and increase sweeping efficiency. Under subsurface conditions, the injection of nitrate and <span class="hlt">Fe</span> (II) as the electron acceptor and donor allows bacteria to grow. The reaction products include minerals such as <span class="hlt">Fe</span>(OH)3 and nitrogen containing gases. These reaction products can have large impact on oil and reservoir properties and can enhance the recovery of trapped oil. This work aims to understand the <span class="hlt">Fe</span>(II) oxidation by nitrate under conditions relevant to MEOR. Reactive transport <span class="hlt">modeling</span> is used to simulate the fluid flow, transport, and reactions involved in this process. Here we developed a complex reactive network for microbial mediated nitrate-dependent <span class="hlt">Fe</span> (II) oxidation that involves both thermodynamic controlled aqueous reactions and kinetic controlled <span class="hlt">Fe</span> (II) mineral reaction. Reactive transport <span class="hlt">modeling</span> is used to understand and quantify the coupling between flow, transport, and reaction processes. Our results identify key parameter controls those are important for the alteration of permeability profile under field conditions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/29428558','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/29428558"><span>Structure and electrochemistry of proteins harboring iron-sulfur clusters of different nuclearities. <span class="hlt">Part</span> II. [4<span class="hlt">Fe</span>-4S] and [3<span class="hlt">Fe</span>-4S] iron-sulfur proteins.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Zanello, Piero</p> <p>2018-06-01</p> <p>In the context of the plethora of proteins harboring iron-sulfur clusters we have already reviewed structure/electrochemistry of metalloproteins expressing single types of iron-sulfur clusters (namely: {<span class="hlt">Fe</span>(Cys) 4 }, {[<span class="hlt">Fe</span> 2 S 2 ](Cys) 4 }, {[<span class="hlt">Fe</span> 2 S 2 ](Cys) 3 (X)} (X = Asp, Arg, His), {[<span class="hlt">Fe</span> 2 S 2 ](Cys) 2 (His) 2 }, {[<span class="hlt">Fe</span> 3 S 4 ](Cys) 3 }, {[<span class="hlt">Fe</span> 4 S 4 ](Cys) 4 } and {[<span class="hlt">Fe</span> 4 S 4 ](S γ Cys ) 3 (nonthiolate ligand)} cores) and their synthetic analogs. More recently we are focussing on structure/electrochemistry of metalloproteins harboring iron-sulfur centres of different nuclearities. Having started such a subject with proteins harboring [4<span class="hlt">Fe</span>-4S] and [2<span class="hlt">Fe</span>-2S] clusters, we now depict the state of art of proteins containing [4<span class="hlt">Fe</span>-4S] and [3<span class="hlt">Fe</span>-4S] clusters. Copyright © 2018 Elsevier Inc. All rights reserved.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018JPhCS.969a2038H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018JPhCS.969a2038H"><span>Irreversibility and critical current density of <span class="hlt">Fe</span>Sr2ErCu2O6+y</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hata, Y.; Iida, I.; Mochiku, T.; Yasuoka, H.</p> <p>2018-03-01</p> <p><span class="hlt">Fe</span>Sr2ErCu2O6+y (Er<span class="hlt">Fe</span>1212) and non-superconducting <span class="hlt">Fe</span>Sr2ErCu1.9Zn0.1O6+y were synthesized to study the property of the superconductivity and the irreversibility of Er<span class="hlt">Fe</span>1212. A large irreversibility in the temperature dependence of magnetization and a hysteresis in the magnetization curve were observed in Er<span class="hlt">Fe</span>1212. By comparison with non-superconducting <span class="hlt">Fe</span>Sr2ErCu1.9Zn0.1O6+y, it was found that the most <span class="hlt">part</span> of the hysteresis at high magnetic eld originates from the magnetism of <span class="hlt">Fe</span> ion and some <span class="hlt">part</span> of the hysteresis at low magnetic eld originates from the superconductivity. Using the magnetization curve of Er<span class="hlt">Fe</span>1212 and <span class="hlt">Fe</span>Sr2ErCu1.9Zn0.1O6+y, the J c of Er<span class="hlt">Fe</span>1212 in individual grains at 10 K under 0.1 T was estimated by the Bean <span class="hlt">model</span> and {J}\\text{c}\\text{intra} was 2.6 × 109 A/m2. The critical current density across inter-grain boundaries at 10 K estimated by V ‑ I measurement was {J}\\text{c}\\text{intra} = 5.7 × 104 A/m2. A large difference between {J}\\text{c}\\text{intra} and {J}\\text{c}\\text{intra} was observed in Er<span class="hlt">Fe</span>1212. {J}\\text{c}\\text{intra} and {J}\\text{c}\\text{intra} of Er<span class="hlt">Fe</span>1212 are 2.2 and 5.2 times larger than these of YFe1212, respectively.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3843950','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3843950"><span>Hydrogen Activation by Biomimetic [Ni<span class="hlt">Fe</span>]-Hydrogenase <span class="hlt">Model</span> Containing Protected Cyanide Cofactors</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Manor, Brian C.; Rauchfuss, Thomas B.</p> <p>2013-01-01</p> <p>Described are experiments that allow incorporation of cyanide cofactors and hydride substrate into active site <span class="hlt">models</span> [Ni<span class="hlt">Fe</span>]-hydrogenases (H2ases). Complexes of the type (CO)2(CN)2<span class="hlt">Fe</span>(pdt)Ni(dxpe), (dxpe = dppe, 1; dxpe = dcpe, 2) bind the Lewis acid B(C6F5)3 (BArF3) to give the adducts (CO)2(CNBArF3)2<span class="hlt">Fe</span>(pdt)Ni(dxpe), (1(BArF3)2, 2(BArF3)2). Upon decarbonylation using amine oxides, these adducts react with H2 to give hydrido derivatives Et4N[(CO)(CNBArF3)2<span class="hlt">Fe</span>(H)(pdt)Ni(dxpe)], (dxpe = dppe, Et4N[H3(BArF3)2]; dxpe = dcpe, Et4N[H4(BArF3)2]). Crystallographic analysis shows that Et4N[H3(BArF3)2] generally resembles the active site of the enzyme in the reduced, hydride-containing states (Ni-C/R). The <span class="hlt">Fe</span>-H…Ni center is unsymmetrical with r<span class="hlt">Fe</span>-H = 1.51(3) and rNi-H = 1.71(3) Å. Both crystallographic and 19F NMR analysis show that the CNBArF3− ligands occupy basal and apical sites. Unlike cationic Ni-<span class="hlt">Fe</span> hydrides, [H3(BArF3)2]− and [H4(BArF3)2]− oxidize at mild potentials, near the Fc+/0 couple. Electrochemical measurements indicate that in the presence of base, [H3(BArF3)2]− catalyzes the oxidation of H2. NMR evidence indicates dihydrogen bonding between these anionic hydrides and ammonium salts, which is relevant to the mechanism of hydrogenogenesis. In the case of Et4N[H3(BArF3)2], strong acids such as HCl induce H2 release to give the chloride Et4N[(CO)(CNBArF3)2<span class="hlt">Fe</span>(pdt)(Cl)Ni(dppe)]. PMID:23899049</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016E%26PSL.447...72Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016E%26PSL.447...72Z"><span>Temperature of Earth's core constrained from melting of <span class="hlt">Fe</span> and <span class="hlt">Fe</span>0.9Ni0.1 at high pressures</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhang, Dongzhou; Jackson, Jennifer M.; Zhao, Jiyong; Sturhahn, Wolfgang; Alp, E. Ercan; Hu, Michael Y.; Toellner, Thomas S.; Murphy, Caitlin A.; Prakapenka, Vitali B.</p> <p>2016-08-01</p> <p>The melting points of fcc- and hcp-structured <span class="hlt">Fe</span>0.9Ni0.1 and <span class="hlt">Fe</span> are measured up to 125 GPa using laser heated diamond anvil cells, synchrotron Mössbauer spectroscopy, and a recently developed fast temperature readout spectrometer. The onset of melting is detected by a characteristic drop in the time-integrated synchrotron Mössbauer signal which is sensitive to atomic motion. The thermal pressure experienced by the samples is constrained by X-ray diffraction measurements under high pressures and temperatures. The obtained best-fit melting curves of fcc-structured <span class="hlt">Fe</span> and <span class="hlt">Fe</span>0.9Ni0.1 fall within the wide region bounded by previous studies. We are able to derive the γ-ɛ-l triple point of <span class="hlt">Fe</span> and the quasi triple point of <span class="hlt">Fe</span>0.9Ni0.1 to be 110 ± 5GPa, 3345 ± 120K and 116 ± 5GPa, 3260 ± 120K, respectively. The measured melting temperatures of <span class="hlt">Fe</span> at similar pressure are slightly higher than those of <span class="hlt">Fe</span>0.9Ni0.1 while their one sigma uncertainties overlap. Using previously measured phonon density of states of hcp-<span class="hlt">Fe</span>, we calculate melting curves of hcp-structured <span class="hlt">Fe</span> and <span class="hlt">Fe</span>0.9Ni0.1 using our (quasi) triple points as anchors. The extrapolated <span class="hlt">Fe</span>0.9Ni0.1 melting curve provides an estimate for the upper bound of Earth's inner core-outer core boundary temperature of 5500 ± 200K. The temperature within the liquid outer core is then approximated with an adiabatic <span class="hlt">model</span>, which constrains the upper bound of the temperature at the core side of the core-mantle boundary to be 4000 ± 200K. We discuss a potential melting point depression caused by light elements and the implications of the presented core-mantle boundary temperature bounds on phase relations in the lowermost <span class="hlt">part</span> of the mantle.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/1340498-temperature-earth-core-constrained-from-melting-fe-fe0-high-pressures','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/1340498-temperature-earth-core-constrained-from-melting-fe-fe0-high-pressures"><span>Temperature of Earth's core constrained from melting of <span class="hlt">Fe</span> and <span class="hlt">Fe</span> 0.9Ni 0.1 at high pressures</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Zhang, Dongzhou; Jackson, Jennifer M.; Zhao, Jiyong</p> <p></p> <p>The melting points of fcc- and hcp-structured <span class="hlt">Fe</span> 0.9Ni 0.1 and <span class="hlt">Fe</span> are measured up to 125 GPa using laser heated diamond anvil cells, synchrotron Mossbauer spectroscopy, and a recently developed fast temperature readout spectrometer. The onset of melting is detected by a characteristic drop in the time integrated synchrotron Mfissbauer signal which is sensitive to atomic motion. The thermal pressure experienced by the samples is constrained by X-ray diffraction measurements under high pressures and temperatures. The obtained best-fit melting curves of fcc-structured <span class="hlt">Fe</span> and <span class="hlt">Fe</span> 0.9Ni 0.1 fall within the wide region bounded by previous studies. We are ablemore » to derive the gamma-is an element of-1 triple point of <span class="hlt">Fe</span> and the quasi triple point of <span class="hlt">Fe</span>0.9Ni0.1 to be 110 ± 5 GPa, 3345 ± 120 K and 116 ± 5 GPa, 3260 ± 120 K, respectively. The measured melting temperatures of <span class="hlt">Fe</span> at similar pressure are slightly higher than those of <span class="hlt">Fe</span> 0.9Ni 0.1 while their one sigma uncertainties overlap. Using previously measured phonon density of states of hcp-<span class="hlt">Fe</span>, we calculate melting curves of hcp-structured <span class="hlt">Fe</span> and <span class="hlt">Fe</span> 0.9Ni 0.1 using our (quasi) triple points as anchors. The extrapolated <span class="hlt">Fe</span> 0.9Ni 0.1 melting curve provides an estimate for the upper bound of Earth's inner core-outer core boundary temperature of 5500 ± 200 K. The temperature within the liquid outer core is then approximated with an adiabatic <span class="hlt">model</span>, which constrains the upper bound of the temperature at the core side of the core -mantle boundary to be 4000 ± 200 K. We discuss a potential melting point depression caused by light elements and the implications of the presented core -mantle boundary temperature bounds on phase relations in the lowermost <span class="hlt">part</span> of the mantle.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013AGUFMMR21A2325O','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013AGUFMMR21A2325O"><span>Melting Experiments in the <span class="hlt">Fe-Fe</span>Si System at High Pressure</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ozawa, H.; Hirose, K.</p> <p>2013-12-01</p> <p>The principal light element in the Earth's core must reproduce the density jump at the inner core boundary (ICB). Silicon is thought to be a plausible light element in the core, and the melting phase relations in <span class="hlt">Fe-Fe</span>Si binary system at the ICB pressure are of great importance. Theoretical calculations on the <span class="hlt">Fe-Fe</span>Si binary system suggested that the difference in Si content between the outer core and the inner core would be too small to satisfy the observed density jump at the ICB [Alfè et al., 2002 EPSL], which requires other light elements in addition to silicon. Here we experimentally examined partitioning of silicon between liquid and solid iron up to 97 GPa. High pressure and temperature conditions were generated in a laser-heated diamond-anvil cell. Chemical compositions of co-existing quenched liquid and solid <span class="hlt">Fe</span>-Si alloys were determined with a field-emission-type electron probe micro-analyzer. We used <span class="hlt">Fe</span>-Si alloy containing 9 wt% Si as a starting material. Chemical analyses on the recovered samples from 39 and 49 GPa demonstrated the coexistence of quenched Si-depleted liquid and Si-enriched solid. In contrast, silicon partitions preferentially into liquid metal at 97 GPa, suggesting the starting composition (<span class="hlt">Fe</span>-9wt% Si) lies on the iron-rich <span class="hlt">part</span> of the eutectic. These results indicate the eutectic composition shifts toward <span class="hlt">Fe</span>Si between 49 and 97 GPa.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2005ApJS..158..230M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2005ApJS..158..230M"><span>Accurate Wavelength Measurements and <span class="hlt">Modeling</span> of <span class="hlt">Fe</span> XV to <span class="hlt">Fe</span> XIX Spectra Recorded in High-Density Plasmas between 13.5 and 17 Å</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>May, M. J.; Beiersdorfer, P.; Dunn, J.; Jordan, N.; Hansen, S. B.; Osterheld, A. L.; Faenov, A. Ya.; Pikuz, T. A.; Skobelev, I. Yu.; Flora, F.; Bollanti, S.; Di Lazzaro, P.; Murra, D.; Reale, A.; Reale, L.; Tomassetti, G.; Ritucci, A.; Francucci, M.; Martellucci, S.; Petrocelli, G.</p> <p>2005-06-01</p> <p>Iron spectra have been recorded from plasmas created at three different laser plasma facilities: the Tor Vergata University laser in Rome (Italy), the Hercules laser at ENEA in Frascati (Italy), and the Compact Multipulse Terawatt (COMET) laser at LLNL in California (USA). The measurements provide a means of identifying dielectronic satellite lines from <span class="hlt">Fe</span> XVI and <span class="hlt">Fe</span> XV in the vicinity of the strong 2p-->3d transitions of <span class="hlt">Fe</span> XVII. About 80 Δn>=1 lines of <span class="hlt">Fe</span> XV (Mg-like) to <span class="hlt">Fe</span> XIX (O-like) were recorded between 13.8 and 17.1 Å with a high spectral resolution (λ/Δλ~4000) about 30 of these lines are from <span class="hlt">Fe</span> XVI and <span class="hlt">Fe</span> XV. The laser-produced plasmas had electron temperatures between 100 and 500 eV and electron densities between 1020 and 1022 cm-3. The Hebrew University Lawrence Livermore Atomic Code (HULLAC) was used to calculate the atomic structure and atomic rates for <span class="hlt">Fe</span> XV-XIX. HULLAC was used to calculate synthetic line intensities at Te=200 eV and ne=1021 cm-3 for three different conditions to illustrate the role of opacity: optically thin plasmas with no excitation-autoionization/dielectronic recombination (EA/DR) contributions to the line intensities, optically thin plasmas that included EA/DR contributions to the line intensities, and optically thick plasmas (optical depth ~200 μm) that included EA/DR contributions to the line intensities. The optically thick simulation best reproduced the recorded spectrum from the Hercules laser. However, some discrepancies between the <span class="hlt">modeling</span> and the recorded spectra remain.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015GeCoA.165...44S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015GeCoA.165...44S"><span>Fractionation of <span class="hlt">Fe</span> isotopes during <span class="hlt">Fe</span>(II) oxidation by a marine photoferrotroph is controlled by the formation of organic <span class="hlt">Fe</span>-complexes and colloidal <span class="hlt">Fe</span> fractions</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Swanner, Elizabeth D.; Wu, Wenfang; Schoenberg, Ronny; Byrne, James; Michel, F. Marc; Pan, Yongxin; Kappler, Andreas</p> <p>2015-09-01</p> <p>Much interest exists in finding mineralogical, organic, morphological, or isotopic biosignatures for <span class="hlt">Fe</span>(II)-oxidizing bacteria (<span class="hlt">Fe</span>OB) that are retained in <span class="hlt">Fe</span>-rich sediments, which could indicate the activity of these organisms in <span class="hlt">Fe</span>-rich seawater, more common in the Precambrian Era. To date, the effort to establish a clear <span class="hlt">Fe</span> isotopic signature in <span class="hlt">Fe</span> minerals produced by <span class="hlt">Fe</span>(II)-oxidizing metabolisms has been thwarted by the large kinetic fractionation incurred as freshly oxidized aqueous <span class="hlt">Fe</span>(III) rapidly precipitates as <span class="hlt">Fe</span>(III) (oxyhydr)oxide minerals at near neutral pH. The <span class="hlt">Fe</span>(III) (oxyhydr)oxide minerals resulting from abiotic <span class="hlt">Fe</span>(II) oxidation are isotopically heavy compared to the <span class="hlt">Fe</span>(II) precursor and are not clearly distinguishable from minerals formed by <span class="hlt">Fe</span>OB isotopically. However, in marine hydrothermal systems and <span class="hlt">Fe</span>(II)-rich springs the minerals formed are often isotopically lighter than expected considering the fraction of <span class="hlt">Fe</span>(II) that has been oxidized and experimentally-determined fractionation factors. We measured the <span class="hlt">Fe</span> isotopic composition of aqueous <span class="hlt">Fe</span> (Feaq) and the final <span class="hlt">Fe</span> mineral (Feppt) produced in batch experiment using the marine <span class="hlt">Fe</span>(II)-oxidizing phototroph Rhodovulum iodosum. The δ56Feaq data are best described by a kinetic fractionation <span class="hlt">model</span>, while the evolution of δ56Feppt appears to be controlled by a separate fractionation process. We propose that soluble <span class="hlt">Fe</span>(III), and <span class="hlt">Fe</span>(II) and <span class="hlt">Fe</span>(III) extracted from the Feppt may act as intermediates between <span class="hlt">Fe</span>(II) oxidation and <span class="hlt">Fe</span>(III) precipitation. Based on 57<span class="hlt">Fe</span> Mössbauer spectroscopy, extended X-ray absorption fine structure (EXAFS) spectroscopy, and X-ray total scattering, we suggests these <span class="hlt">Fe</span> phases, collectively <span class="hlt">Fe</span>(II/III)interm, may consist of organic-ligand bound, sorbed, and/or colloidal <span class="hlt">Fe</span>(II) and <span class="hlt">Fe</span>(III) mineral phases that are isotopically lighter than the final <span class="hlt">Fe</span>(III) mineral product. Similar intermediate phases, formed in response to organic carbon produced by <span class="hlt">Fe</span>OB and inorganic</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017MRE.....4k6518B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017MRE.....4k6518B"><span>Mechanical properties of <span class="hlt">Fe</span> rich <span class="hlt">Fe</span>-Si alloys: ab initio local bulk-modulus viewpoint</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Bhattacharya, Somesh Kr; Kohyama, Masanori; Tanaka, Shingo; Shiihara, Yoshinori; Saengdeejing, Arkapol; Chen, Ying; Mohri, Tetsuo</p> <p>2017-11-01</p> <p><span class="hlt">Fe</span>-rich <span class="hlt">Fe</span>-Si alloys show peculiar bulk-modulus changes depending on the Si concentration in the range of 0-15 at.%Si. In order to clarify the origin of this phenomenon, we have performed density-functional theory calculations of supercells of <span class="hlt">Fe</span>-Si alloy <span class="hlt">models</span> with various Si concentrations. We have applied our recent techniques of ab initio local energy and local stress, by which we can obtain a local bulk modulus of each atom or atomic group as a local constituent of the cell-averaged bulk modulus. A2-phase alloy <span class="hlt">models</span> are constructed by introducing Si substitution into bcc <span class="hlt">Fe</span> as uniformly as possible so as to prevent mutual neighboring, while higher Si concentrations over 6.25 at.%Si lead to contacts between Si<span class="hlt">Fe</span>8 cubic clusters via sharing corner <span class="hlt">Fe</span> atoms. For 12.5 at.%Si, in addition to an A2 <span class="hlt">model</span>, we deal with partial D03 <span class="hlt">models</span> containing local D03-like layers consisting of edge-shared Si<span class="hlt">Fe</span>8 cubic clusters. For the cell-averaged bulk modulus, we have successfully reproduced the Si-concentration dependence as a monotonic decrease until 11.11 at.%Si and a recovery at 12.5 at.%Si. The analysis of local bulk moduli of Si<span class="hlt">Fe</span>8 cubic clusters and <span class="hlt">Fe</span> regions is effective to understand the variations of the cell-averaged bulk modulus. The local bulk moduli of <span class="hlt">Fe</span> regions become lower for increasing Si concentration, due to the suppression of bulk-like d-d bonding states in narrow <span class="hlt">Fe</span> regions. For higher Si concentrations till 11.11 at.%Si, corner-shared contacts or 1D chains of Si<span class="hlt">Fe</span>8 clusters lead to remarkable reduction of local bulk moduli of the clusters. At 12 at.%Si, on the other hand, two- or three-dimensional arrangements of corner- or edge-shared Si<span class="hlt">Fe</span>8 cubic clusters show greatly enhanced local bulk moduli, due to quite different bonding nature with much stronger p-d hybridization. The relation among the local bulk moduli, local electronic and magnetic structures, and local configurations such as connectivity of Si<span class="hlt">Fe</span>8 clusters and <span class="hlt">Fe</span>-region sizes has been</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1261385-effects-two-temperature-model-cascade-evolution-ni-nife','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1261385-effects-two-temperature-model-cascade-evolution-ni-nife"><span>Effects of two-temperature <span class="hlt">model</span> on cascade evolution in Ni and Ni<span class="hlt">Fe</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Samolyuk, German D.; Xue, Haizhou; Bei, Hongbin; ...</p> <p>2016-07-05</p> <p>We perform molecular dynamics simulations of Ni ion cascades in Ni and equiatomic Ni<span class="hlt">Fe</span> under the following conditions: (a) classical molecular dynamics (MD) simulations without consideration of electronic energy loss, (b) classical MD simulations with the electronic stopping included, and (c) using the coupled two-temperature MD (2T-MD) <span class="hlt">model</span> that incorporates both the electronic stopping and the electron-phonon interactions. Our results indicate that the electronic effects are more profound in the higher-energy cascades, and that the 2T-MD <span class="hlt">model</span> results in a smaller amount of surviving damage and smaller defect clusters, while less damage is produced in Ni<span class="hlt">Fe</span> than in Ni.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016NatCh...8.1054B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016NatCh...8.1054B"><span>Nickel-centred proton reduction catalysis in a <span class="hlt">model</span> of [Ni<span class="hlt">Fe</span>] hydrogenase</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Brazzolotto, Deborah; Gennari, Marcello; Queyriaux, Nicolas; Simmons, Trevor R.; Pécaut, Jacques; Demeshko, Serhiy; Meyer, Franc; Orio, Maylis; Artero, Vincent; Duboc, Carole</p> <p>2016-11-01</p> <p>Hydrogen production through water splitting is one of the most promising solutions for the storage of renewable energy. [Ni<span class="hlt">Fe</span>] hydrogenases are organometallic enzymes containing nickel and iron centres that catalyse hydrogen evolution with performances that rival those of platinum. These enzymes provide inspiration for the design of new molecular catalysts that do not require precious metals. However, all heterodinuclear Ni<span class="hlt">Fe</span> <span class="hlt">models</span> reported so far do not reproduce the Ni-centred reactivity found at the active site of [Ni<span class="hlt">Fe</span>] hydrogenases. Here, we report a structural and functional Ni<span class="hlt">Fe</span> mimic that displays reactivity at the Ni site. This is shown by the detection of two catalytic intermediates that reproduce structural and electronic features of the Ni-L and Ni-R states of the enzyme during catalytic turnover. Under electrocatalytic conditions, this mimic displays high rates for H2 evolution (second-order rate constant of 2.5 × 104 M-1 s-1 turnover frequency of 250 s-1 at 10 mM H+ concentration) from mildly acidic solutions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5493981','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5493981"><span>Nickel centred H+ reduction catalysis in a <span class="hlt">model</span> of [Ni<span class="hlt">Fe</span>] Hydrogenase</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Brazzolotto, Deborah; Gennari, Marcello; Queyriaux, Nicolas; Simmons, Trevor R.; Pécaut, Jacques; Demeshko, Serhiy; Meyer, Franc; Orio, Maylis; Artero, Vincent; Duboc, Carole</p> <p>2017-01-01</p> <p>Hydrogen production through water splitting is one of the most promising solutions for the storage of renewable energy. [Ni<span class="hlt">Fe</span>] hydrogenases are organometallic enzymes containing nickel and iron centers that catalyze hydrogen evolution with performances that rival those of platinum. These enzymes provide inspiration for the design of new molecular catalysts that do not require precious metals. However, all heterodinuclear Ni<span class="hlt">Fe</span> <span class="hlt">models</span> reported so far do not reproduce the Ni-centered reactivity found at the active site of [Ni<span class="hlt">Fe</span>] hydrogenases. Here we report a structural and functional Ni<span class="hlt">Fe</span> mimic that displays reactivity at the Ni site. This is shown by the detection of two catalytic intermediates that reproduce structural and electronic features of the Ni-L and Ni-R states of the enzyme during catalytic turnover. Under electrocatalytic conditions, this mimic displays high rates for H2 evolution (second order rate constant of 2.5 104 M-1s-1; turnover frequency of 225 s-1 at 10 mM H+ concentration) from mildly acidic solutions. PMID:27768098</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013CRGeo.345..230M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013CRGeo.345..230M"><span>Ab initio calculations of the <span class="hlt">Fe</span>(II) and <span class="hlt">Fe</span>(III) isotopic effects in citrates, nicotianamine, and phytosiderophore, and new <span class="hlt">Fe</span> isotopic measurements in higher plants</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Moynier, Frédéric; Fujii, Toshiyuki; Wang, Kun; Foriel, Julien</p> <p>2013-05-01</p> <p>Iron is one of the most abundant transition metal in higher plants and variations in its isotopic compositions can be used to trace its utilization. In order to better understand the effect of plant-induced isotopic fractionation on the global <span class="hlt">Fe</span> cycling, we have estimated by quantum chemical calculations the magnitude of the isotopic fractionation between different <span class="hlt">Fe</span> species relevant to the transport and storage of <span class="hlt">Fe</span> in higher plants: <span class="hlt">Fe</span>(II)-citrate, <span class="hlt">Fe</span>(III)-citrate, <span class="hlt">Fe</span>(II)-nicotianamine, and <span class="hlt">Fe</span>(III)-phytosiderophore. The ab initio calculations show firstly, that <span class="hlt">Fe</span>(II)-nicotianamine is ˜3‰ (56<span class="hlt">Fe</span>/54<span class="hlt">Fe</span>) isotopically lighter than <span class="hlt">Fe</span>(III)-phytosiderophore; secondly, even in the absence of redox changes of <span class="hlt">Fe</span>, change in the speciation alone can create up to ˜1.5‰ isotopic fractionation. For example, <span class="hlt">Fe</span>(III)-phytosiderophore is up to 1.5‰ heavier than <span class="hlt">Fe</span>(III)-citrate2 and <span class="hlt">Fe</span>(II)-nicotianamine is up to 1‰ heavier than <span class="hlt">Fe</span>(II)-citrate. In addition, in order to better understand the <span class="hlt">Fe</span> isotopic fractionation between different plant components, we have analyzed the iron isotopic composition of different organs (roots, seeds, germinated seeds, leaves and stems) from six species of higher plants: the dicot lentil (Lens culinaris), and the graminaceous monocots Virginia wild rye (Elymus virginicus), Johnsongrass (Sorghum halepense), Kentucky bluegrass (Poa pratensis), river oat (Uniola latifolia), and Indian goosegrass (Eleusine indica). The calculations may explain that the roots of strategy-II plants (<span class="hlt">Fe</span>(III)-phytosiderophore) are isotopically heavier (by about 1‰ for the δ56<span class="hlt">Fe</span>) than the upper <span class="hlt">parts</span> of the plants (<span class="hlt">Fe</span> transported as <span class="hlt">Fe</span>(III)-citrate in the xylem or <span class="hlt">Fe</span>(II)-nicotianamine in the phloem). In addition, we suggest that the isotopic variations observed between younger and older leaves could be explained by mixing of <span class="hlt">Fe</span> received from the xylem and the phloem.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_3");'>3</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li class="active"><span>5</span></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_5 --> <div id="page_6" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li class="active"><span>6</span></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="101"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017JMMM..426..504L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017JMMM..426..504L"><span>Enhanced and broadband microwave absorption of flake-shaped <span class="hlt">Fe</span> and <span class="hlt">Fe</span>Ni composite with Ba ferrites</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Li, Wangchang; Lv, Junjun; Zhou, Xiang; Zheng, Jingwu; Ying, Yao; Qiao, Liang; Yu, Jing; Che, Shenglei</p> <p>2017-03-01</p> <p>In order to achieve a broad bandwidth absorber at high frequency, the composites of M-type ferrite BaCo1.0Ti1.0<span class="hlt">Fe</span>10O19 (BaM) with flaked carbonyl iron powders (CIP) and flaked <span class="hlt">Fe</span>50Ni50 were prepared to optimize the surface impedance in broadband frequency, respectively. The diameter of the flaked carbonyl iron powders (CIP) and <span class="hlt">Fe</span>50Ni50 is in the range of 5-10 μm and 10-20 μm and the thickness of the CIP and <span class="hlt">Fe</span>50Ni50 is close to 200 nm and 400 nm, respectively. The complex permeability and permittivity show that the addition of BaM obviously reduces the values of real <span class="hlt">part</span> of permittivity and imaginary <span class="hlt">part</span> of the permeability which can enhance the matched-wave-impedance. The absorption bands less than -10 dB of CIP-BaM and <span class="hlt">Fe</span>Ni-BaM absorber approach to 5.5 GHz (5.7-11.2 GHz) and 7 GHz (11-18 GHz) at 1.5 mm. However, the bands of CIP and <span class="hlt">Fe</span>Ni are only 1.9 GHz (4.7-6.6 GHz) and 2.1 GHz (4.0-6.1 GHz). Hence, the electromagnetic match property is greatly improved by BaM ferrites, and this composite shows a broaden absorption band.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/servlets/purl/15016764','SCIGOV-STC'); return false;" href="https://www.osti.gov/servlets/purl/15016764"><span>Accurate wavelength measurements and <span class="hlt">modeling</span> of <span class="hlt">Fe</span>XV to <span class="hlt">Fe</span>XIX spectra recorded in high density plasmas between 13.5 to 17 A.</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>May, M; Beiersdorfer, P; Dunn, J</p> <p></p> <p>Iron spectra have been recorded from plasmas created at three different laser plasma facilities, the Tor Vergata University laser in Rome (Italy), the Hercules laser at ENEA in Frascati (Italy), and the Compact Multipulse Terawatt (COMET) laser at LLNL in California (USA). The measurements provide a means of identifying dielectronic satellite lines from <span class="hlt">Fe</span>XVI and <span class="hlt">Fe</span>XV in the vicinity of the strong 2p {yields} 3d transitions of <span class="hlt">Fe</span>XVII. About 80 {Delta}n {ge} 1 lines of <span class="hlt">Fe</span>XV (Mg-like) to <span class="hlt">Fe</span>XIX (O-like) were recorded between 13.8 to 17.1 {angstrom} with a high spectral resolution ({lambda}/{Delta}{lambda} {approx} 4000), about thirty of these linesmore » are from <span class="hlt">Fe</span>XVI and <span class="hlt">Fe</span>XV. The laser produced plasmas had electron temperatures between 100 to 500 eV and electron densities between 10{sup 20} to 10{sup 22} cm{sup -3}. The Hebrew University Lawrence Livermore Atomic Code (HULLAC) was used to calculate the atomic structure and atomic rates for <span class="hlt">Fe</span>XV to <span class="hlt">Fe</span>XIX. HULLAC was used to calculate synthetic line intensities at T{sub e} = 200 eV and n{sub e} = 10{sup 21}cm{sup -3} for three different conditions to illustrate the role of opacity: optically thin plasmas with no excitation-autoionization/dielectronic recombination (EA/DR) contributions to the line intensities, optically thin plasmas that included EA/DR contributions to the line intensities, and optically thick plasmas (optical depth {approx} 200 {micro}m) that included EA/DR contributions to the line intensities. The optically thick simulation best reproduced the recorded spectrum from the Hercules laser. However some discrepancies between the <span class="hlt">modeling</span> and the recorded spectra remain.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011icov.conf..801S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011icov.conf..801S"><span><span class="hlt">FE</span> <span class="hlt">Modelling</span> of the Fluid-Structure-Acoustic Interaction for the Vocal Folds Self-Oscillation</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Švancara, Pavel; Horáček, J.; Hrůza, V.</p> <p></p> <p>The flow induced self-oscillation of the human vocal folds in interaction with acoustic processes in the simplified vocal tract <span class="hlt">model</span> was explored by three-dimensional (3D) finite element (<span class="hlt">FE</span>) <span class="hlt">model</span>. Developed <span class="hlt">FE</span> <span class="hlt">model</span> includes vocal folds pretension before phonation, large deformations of the vocal fold tissue, vocal folds contact, fluid-structure interaction, morphing the fluid mesh according the vocal folds motion (Arbitrary Lagrangian-Eulerian approach), unsteady viscous compressible airflow described by the Navier-Stokes equations and airflow separation during the glottis closure. Iterative partitioned approach is used for <span class="hlt">modelling</span> the fluid-structure interaction. Computed results prove that the developed <span class="hlt">model</span> can be used for simulation of the vocal folds self-oscillation and resulting acoustic waves. The developed <span class="hlt">model</span> enables to numerically simulate an influence of some pathological changes in the vocal fold tissue on the voice production.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016AGUFMOS43B2033G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016AGUFMOS43B2033G"><span>Kinetic <span class="hlt">model</span> to explain the effect of ocean warming and acidification on the <span class="hlt">Fe</span>(II) oxidation rate in oligotrophic and eutrophic natural waters</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>González-Dávila, M.; Samperio-Ramos, G.; Santana-Casiano, J. M.; Gonzallez, A. G.; Pérez-Almeida, N.</p> <p>2016-12-01</p> <p>The speciation of inorganic <span class="hlt">Fe</span>(II) as a function of the pH and temperature have been <span class="hlt">modeled</span> in order to elucidate the inorganic <span class="hlt">Fe</span>(II) redox behavior over a wide range of scenarios of acidification and global warming of the upper ocean, as well as, changes due to natural ambient fluctuations of pH and temperature. In addition, a kinetic <span class="hlt">modeling</span> approach has been carried out to elucidate the fractional contribution of most kinetically active <span class="hlt">Fe</span>(II) species to the overall oxidation rate to improve our future and present knowledge with respect to redox iron chemistry in the marine systems. The kinetic <span class="hlt">model</span> considers the interactions of <span class="hlt">Fe</span>(II) with the major ions in seawater, including phosphate and silicate and the competition with copper with the ROS. The <span class="hlt">model</span> has been applied to the experimental results in order to describe the effect of temperature and pH in the speciation of <span class="hlt">Fe</span>(II) and to compute the fractional contribution of each <span class="hlt">Fe</span>(II)-specie to the overall oxidation rate. The oxidation rates (kapp) of nanomolar levels of <span class="hlt">Fe</span>(II) have been studied in seawater enriched with nutrients (SWEN) in air saturated conditions. The nutrient effect (nitrate, phosphate and silicate), on the oxidation of <span class="hlt">Fe</span>(II), has been evaluated as a function of pH (7.2-8.2), temperature (5-35 ºC) and salinity (10-37.09). The oxidation of <span class="hlt">Fe</span>(II) was faster in the presence of nutrient with the change in the <span class="hlt">Fe</span>(II) oxidation rates (Δlogkapp) more intensive at higher temperatures over the entire pH range studied. From the <span class="hlt">model</span> it can be observed that the inorganic speciation of <span class="hlt">Fe</span>(II) is controlled largely by pH, either in SW or in SWEN. A greater presence of <span class="hlt">Fe</span>-nutrient reactive species (<span class="hlt">Fe</span>H3SiO4+ and <span class="hlt">Fe</span>PO4-) in SWEN at higher temperatures explained the changes in the oxidation process. The individual oxidation rates by oxygen, for the <span class="hlt">Fe</span>(II) most kinetically active species (<span class="hlt">Fe</span>2+, <span class="hlt">Fe</span>OH+, <span class="hlt">Fe</span>(OH)2, <span class="hlt">Fe</span>CO3(OH)-, <span class="hlt">Fe</span>CO3, <span class="hlt">Fe</span>(CO3)22-, <span class="hlt">Fe</span>H3SiO3+, <span class="hlt">Fe</span>PO4-), were fitted as a function of the</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018PhRvB..97d5118Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018PhRvB..97d5118Z"><span>Breakdown of single spin-fluid <span class="hlt">model</span> in the heavily hole-doped superconductor Cs<span class="hlt">Fe</span>2As2</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhao, D.; Li, S. J.; Wang, N. Z.; Li, J.; Song, D. W.; Zheng, L. X.; Nie, L. P.; Luo, X. G.; Wu, T.; Chen, X. H.</p> <p>2018-01-01</p> <p>Although <span class="hlt">Fe</span>-based superconductors are correlated electronic systems with multiorbital, previous nuclear magnetic resonance (NMR) measurement suggests that a single spin-fluid <span class="hlt">model</span> is sufficient to describe its spin behavior. Here, we first observed the breakdown of single spin-fluid <span class="hlt">model</span> in a heavily hole-doped <span class="hlt">Fe</span>-based superconductor Cs<span class="hlt">Fe</span>2As2 by site-selective NMR measurement. At high-temperature regime, both Knight shift and nuclear spin-lattice relaxation at 133Cs and 75As nuclei exhibit distinct temperature-dependent behavior, suggesting the breakdown of the single spin-fluid <span class="hlt">model</span> in Cs<span class="hlt">Fe</span>2As2 . This is ascribed to the coexistence of both localized and itinerant spin degree of freedom at 3 d orbitals, which is consistent with the orbital-selective Mott phase. With decreasing temperature, the single spin-fluid behavior is recovered below T*˜75 K due to a coherent state among 3 d orbitals. The Kondo liquid scenario is proposed to understand the low-temperature coherent state.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018PhyB..536..115F','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018PhyB..536..115F"><span>The microscopic <span class="hlt">model</span> of Bi<span class="hlt">Fe</span>O3</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Fishman, R. S.</p> <p>2018-05-01</p> <p>Many years and great effort have been spent constructing the microscopic <span class="hlt">model</span> for the room temperature multiferroic Bi<span class="hlt">Fe</span>O3. However, earlier <span class="hlt">models</span> implicitly assumed that the cycloidal wavevector q was confined to one of the three-fold symmetric axes in the hexagonal plane normal to the electric polarization. Because recent measurements indicate that q can be rotated by a magnetic field, it is essential to properly treat the anisotropy that confines q at low fields. We propose that the anisotropy energy -K3S6sin6 θ cos 6 ϕ confines the wavevectors q to the three-fold axis ϕ = 0 and ± 2 π / 3 within the hexagonal plane with θ = π / 2 .</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/25447545','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/25447545"><span>Recent advances in the Suf <span class="hlt">Fe</span>-S cluster biogenesis pathway: Beyond the Proteobacteria.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Outten, F Wayne</p> <p>2015-06-01</p> <p><span class="hlt">Fe</span>-S clusters play critical roles in cellular function throughout all three kingdoms of life. Consequently, <span class="hlt">Fe</span>-S cluster biogenesis systems are present in most organisms. The Suf (sulfur formation) system is the most ancient of the three characterized <span class="hlt">Fe</span>-S cluster biogenesis pathways, which also include the Isc and Nif systems. Much of the first work on the Suf system took place in Gram-negative Proteobacteria used as <span class="hlt">model</span> organisms. These early studies led to a wealth of biochemical, genetic, and physiological information on Suf function. From those studies we have learned that SufB functions as an <span class="hlt">Fe</span>-S scaffold in conjunction with SufC (and in some cases SufD). SufS and SufE together mobilize sulfur for cluster assembly and SufA traffics the complete <span class="hlt">Fe</span>-S cluster from SufB to target apo-proteins. However, recent progress on the Suf system in other organisms has opened up new avenues of research and new hypotheses about Suf function. This review focuses primarily on the most recent discoveries about the Suf pathway and where those new <span class="hlt">models</span> may lead the field. This article is <span class="hlt">part</span> of a Special Issue entitled: <span class="hlt">Fe</span>/S proteins: Analysis, structure, function, biogenesis and diseases. Copyright © 2014 Elsevier B.V. All rights reserved.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/1188881-epitaxial-fe-y2o3-interfaces-model-system-oxide-dispersion-strengthened-ferritic-alloys','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/1188881-epitaxial-fe-y2o3-interfaces-model-system-oxide-dispersion-strengthened-ferritic-alloys"><span>Epitaxial <span class="hlt">Fe</span>/Y2O3 interfaces as a <span class="hlt">model</span> system for oxide-dispersion-strengthened ferritic alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Kaspar, Tiffany C.; Bowden, Mark E.; Wang, Chong M.</p> <p>2015-02-01</p> <p>The fundamental mechanisms underlying the superior radiation tolerance properties of oxide-dispersion-strengthened ferritic steels and nanostructured ferritic alloys are poorly understood. Thin film heterostructures of <span class="hlt">Fe</span>/Y2O3 can serve as a <span class="hlt">model</span> system for fundamental studies of radiation damage. Epitaxial thin films of Y2O3 were deposited by pulsed laser deposition on 8% Y:ZrO2 (YSZ) substrates with (100), (110), and (111) orientation. Metallic <span class="hlt">Fe</span> was subsequently deposited by molecular beam epitaxy. Characterization by x-ray diffraction and Rutherford backscattering spectrometry in the channeling geometry revealed a degree of epitaxial or axiotaxial ntation for <span class="hlt">Fe</span>(211) deposited on Y2O3(110)/YSZ(110). In contrast, <span class="hlt">Fe</span> on Y2O3(111)/YSZ(111) was fullymore » polycrystalline, and <span class="hlt">Fe</span> on Y2O3(100)/YSZ(100) exhibited out-of-plane texture in the [110] direction with little or no preferential in-plane orientation. Scanning transmission electron microscopy imaging of <span class="hlt">Fe</span>(211)/Y2O3(110)/YSZ(110) revealed a strongly islanded morphology for the <span class="hlt">Fe</span> film, with no epitaxial grains visible in the cross-sectional sample. Well-ordered <span class="hlt">Fe</span> grains with no orientation to the underlying Y2O3 were observed. Well-ordered crystallites of <span class="hlt">Fe</span> with both epitaxial and non-epitaxial orientations on Y2O3 are a promising <span class="hlt">model</span> system for fundamental studies of radiation damage phenomena. This is illustrated with preliminary results of He bubble formation following implantation with a helium ion microscope. He bubble formation is shown to preferentially occur at the <span class="hlt">Fe</span>/Y2O3 interface.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/servlets/purl/1049673','SCIGOV-STC'); return false;" href="https://www.osti.gov/servlets/purl/1049673"><span>Phase-field <span class="hlt">Model</span> for Interstitial Loop Growth Kinetics and Thermodynamic and Kinetic <span class="hlt">Models</span> of Irradiated <span class="hlt">Fe</span>-Cr Alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Li, Yulan; Hu, Shenyang Y.; Sun, Xin</p> <p>2011-06-15</p> <p>, and sink strength of interstitial loop for interstitials. In <span class="hlt">part</span> II, we present a generic phase field <span class="hlt">model</span> and discuss the thermodynamic and kinetic properties in phase-field <span class="hlt">models</span> including the reaction kinetics of radiation defects and local free energy of irradiated materials. In particular, a two-sublattice thermodynamic <span class="hlt">model</span> is suggested to describe the local free energy of alloys with irradiated defects. <span class="hlt">Fe</span>-Cr alloy is taken as an example to explain the required thermodynamic and kinetic properties for quantitative phase-field <span class="hlt">modeling</span>. Finally the great challenges in phase-field <span class="hlt">modeling</span> will be discussed.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017APS..MAR.L2009K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017APS..MAR.L2009K"><span>Experiments, constitutive <span class="hlt">modeling</span> and <span class="hlt">FE</span> simulations of the impact behavior of Molybdenum</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kleiser, Geremy; Revil-Baudard, Benoit</p> <p></p> <p>For polycrystalline high-purity molybdenum the feasibility of a Taylor test is questionable because the very large tensile stresses generated at impact would result in disintegration of the specimen. We report an experimental investigation and new <span class="hlt">model</span> to account simultaneously for the experimentally observed anisotropy, tension-compression asymmetry and strain-rate sensitivity of this material. To ensure high-fidelity predictions, a fully-implicit algorithm was used for implementing the new <span class="hlt">model</span> in the <span class="hlt">FE</span> code ABAQUS. Based on <span class="hlt">model</span> predictions, the impact velocity range was established for which specimens may be recovered. Taylor impact tests in this range (140-165 m/s) were successfully conducted for different specimen taken along the rolling direction (RD), the transverse direction and 45o to the RD. Comparison between the measured profiles of impact specimens and <span class="hlt">FE</span> <span class="hlt">model</span> predictions show excellent agreement. Furthermore, simulations were performed to gain understanding of the dynamic event: time evolution of the pressure, the extent of plastic deformation, distribution of plastic strain rates, and transition to quasi-stable deformation occurs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3644562','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3644562"><span>NRVS and EPR Spectroscopy of 57<span class="hlt">Fe</span>-enriched [<span class="hlt">FeFe</span>] Hydrogenase Indicate Stepwise Assembly of the H-cluster†</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Kuchenreuther, Jon M.; Guo, Yisong; Wang, Hongxin; Myers, William K.; George, Simon J.; Boyke, Christine A.; Yoda, Yoshitaka; Alp, E. Ercan; Zhao, Jiyong; Britt, R. David; Swartz, James R.; Cramer, Stephen P.</p> <p>2013-01-01</p> <p>The [<span class="hlt">FeFe</span>] hydrogenase from Clostridium pasteurianum (CpI) harbors four Fe–S clusters that facilitate electron transfer to the H-cluster, a ligand-coordinated six-iron prosthetic group that catalyzes the redox interconversion of protons and H2. Here, we have used 57<span class="hlt">Fe</span> nuclear resonance vibrational spectroscopy (NRVS) to study the iron centers in CpI, and we compare our data to that for a [4Fe–4S] ferredoxin as well as a <span class="hlt">model</span> complex resembling the [2<span class="hlt">Fe</span>]H catalytic domain of the H-cluster. In order to enrich the hydrogenase with 57<span class="hlt">Fe</span> nuclei, we used cell-free methods to post-translationally mature the enzyme. Specifically, inactive CpI apoprotein with 56<span class="hlt">Fe</span>-labeled Fe–S clusters was activated in vitro using 57<span class="hlt">Fe</span>-enriched maturation proteins. This approach enabled us to selectively label the [2<span class="hlt">Fe</span>]H subcluster with 57<span class="hlt">Fe</span>, which NRVS confirms by detecting 57Fe–CO and 57Fe–CN normal modes from the H-cluster nonprotein ligands. The NRVS and iron quantification results also suggest that the hydrogenase contains a second 57Fe–S cluster. EPR spectroscopy indicates that this 57<span class="hlt">Fe</span>-enriched metal center is not the [4Fe– 4S]H subcluster of the H-cluster. This finding demonstrates that the CpI hydrogenase retained an 56<span class="hlt">Fe</span>-enriched [4Fe–4S]H cluster during in vitro maturation, providing unambiguous evidence for stepwise assembly of the H-cluster. In addition, this work represents the first NRVS characterization of [<span class="hlt">FeFe</span>] hydrogenases. PMID:23249091</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/16633666','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/16633666"><span>A kinetic study of the reactions <span class="hlt">Fe</span>O+ + O, <span class="hlt">Fe</span>+.N2 + O, <span class="hlt">Fe</span>+.O2 + O and <span class="hlt">Fe</span>O+ + CO: implications for sporadic E layers in the upper atmosphere.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Woodcock, K R S; Vondrak, T; Meech, S R; Plane, J M C</p> <p>2006-04-21</p> <p>These gas-phase reactions were studied by pulsed laser ablation of an iron target to produce <span class="hlt">Fe</span>(+) in a fast flow tube, with detection of the ions by quadrupole mass spectrometry. <span class="hlt">Fe</span>(+).N(2) and <span class="hlt">Fe</span>(+).O(2) were produced by injecting N(2) and O(2), respectively, into the flow tube. <span class="hlt">Fe</span>O(+) was produced from <span class="hlt">Fe</span>(+) by addition of N(2)O, or by ligand-switching from <span class="hlt">Fe</span>(+).N(2) following the addition of atomic O. The following rate coefficients were measured: k(<span class="hlt">Fe</span>O(+) + O --> <span class="hlt">Fe</span>(+) + O(2), 186-294 K) = (3.2 +/- 1.5) x 10(-11); k(<span class="hlt">Fe</span>(+).N(2) + O --> <span class="hlt">Fe</span>O(+)+ N(2), 294 K) = (4.6 +/- 2.5) x 10(-10); k(<span class="hlt">Fe</span>(+).O(2) + O --> <span class="hlt">Fe</span>O(+) + O(2), 294 K) = (6.3 +/- 2.7) x 10(-11); and k(<span class="hlt">Fe</span>O(+) + CO --> <span class="hlt">Fe</span>(+) + CO(2), 294 K) = (1.59 +/- 0.34) x 10(-10) cm(3) molecule(-1) s(-1), where the quoted uncertainties are a combination of the 1sigma standard errors in the kinetic data and the systematic experimental errors. The surprisingly slow reaction between <span class="hlt">Fe</span>O(+) and O is examined using ab initio quantum calculations of the relevant potential energy surfaces. The importance of this reaction for controlling the lifetime of sporadic E layers is then demonstrated using a <span class="hlt">model</span> of the upper mesosphere and lower thermosphere.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1328477-negative-cooperativity-nitrogenase-fe-protein-electron-delivery-cycle','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1328477-negative-cooperativity-nitrogenase-fe-protein-electron-delivery-cycle"><span>Negative cooperativity in the nitrogenase <span class="hlt">Fe</span> protein electron delivery cycle</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Danyal, Karamatullah; Shaw, Sudipta; Page, Taylor R.; ...</p> <p>2016-10-04</p> <p>Mo-dependent nitrogenase catalyzes the biological reduction of atmospheric dinitrogen (N2) to two ammonia (NH3) molecules, through the action of two component proteins, the Mo<span class="hlt">Fe</span> protein and the <span class="hlt">Fe</span> protein. The catalytic Mo<span class="hlt">Fe</span> protein is a symmetric dimer of αβ units, each of which contains one active site <span class="hlt">Fe</span>Mo-co (<span class="hlt">Fe</span>Mo-co; [7<span class="hlt">Fe</span>-9S-Mo-C-homocitrate]) and an electron-carrier P cluster. Each half of the nitrogenase ternary complex, in which one <span class="hlt">Fe</span> protein with two bound ATP molecules has bound to each Mo<span class="hlt">Fe</span> protein αβ unit, undergoes an electron transfer (ET) cycle with ET from a <span class="hlt">Fe</span> protein [4<span class="hlt">Fe</span>-4S] cluster into its αβ unit followed bymore » the hydrolysis of the two ATP to two ADP and two Pi. The prevailing <span class="hlt">model</span> holds that each αβ unit of the Mo<span class="hlt">Fe</span> protein functions independently. We now report that the ET cycle exhibits negative cooperativity, with ET and ATP hydrolysis in one half of the ternary nitrogenase complex suppressing these processes in the other half. The observed ET, ATP hydrolysis, and Pi release behavior is captured in a global fit to a two-branch negative-cooperativity kinetic <span class="hlt">model</span>. A possible mechanism for communication between the two halves of Mo<span class="hlt">Fe</span> protein is suggested by normal mode analysis showing correlated and anti-correlated motions between the two nitrogenase αβ halves. EPR spectra furthermore show small differences between those of resting-state and singly-reduced Mo<span class="hlt">Fe</span> protein that can be attributed to an intra-complex allosteric perturbation of the resting-state <span class="hlt">Fe</span>Mo-co in one αβ unit by reduction of <span class="hlt">Fe</span>Mo-co in the other. This work is supported as a <span class="hlt">part</span> of the Biological and Electron Transfer and Catalysis (EFRC) program, an Energy Frontiers Research Center funded by the US Department of Energy (DOE), Office of Science (DE-SC0012518) to LCS, by National Institutes of Health (NIH) grants HL 63203 and GM 111097to BMH, and R15GM110671 to EA, and by the Division of Chemical Sciences, Geosciences, and Bio-Sciences, DOE to SR. The</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/1328477-negative-cooperativity-nitrogenase-fe-protein-electron-delivery-cycle','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/1328477-negative-cooperativity-nitrogenase-fe-protein-electron-delivery-cycle"><span>Negative cooperativity in the nitrogenase <span class="hlt">Fe</span> protein electron delivery cycle</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Danyal, Karamatullah; Shaw, Sudipta; Page, Taylor R.</p> <p></p> <p>Mo-dependent nitrogenase catalyzes the biological reduction of atmospheric dinitrogen (N 2) to two ammonia (NH 3) molecules, through the action of two component proteins, the Mo<span class="hlt">Fe</span> protein and the <span class="hlt">Fe</span> protein. The catalytic Mo<span class="hlt">Fe</span> protein is a symmetric dimer of αβ units, each of which contains one active site <span class="hlt">Fe</span>Mo-co (<span class="hlt">Fe</span>Mo-co; [7<span class="hlt">Fe</span>-9S-Mo-C-homocitrate]) and an electron-carrier P cluster. Each half of the nitrogenase ternary complex, in which one <span class="hlt">Fe</span> protein with two bound ATP molecules has bound to each Mo<span class="hlt">Fe</span> protein αβ unit, undergoes an electron transfer (ET) cycle with ET from a <span class="hlt">Fe</span> protein [4<span class="hlt">Fe</span>-4S] cluster into its αβ unitmore » followed by the hydrolysis of the two ATP to two ADP and two Pi. The prevailing <span class="hlt">model</span> holds that each αβ unit of the Mo<span class="hlt">Fe</span> protein functions independently. We now report that the ET cycle exhibits negative cooperativity, with ET and ATP hydrolysis in one half of the ternary nitrogenase complex suppressing these processes in the other half. The observed ET, ATP hydrolysis, and Pi release behavior is captured in a global fit to a two-branch negative-cooperativity kinetic <span class="hlt">model</span>. A possible mechanism for communication between the two halves of Mo<span class="hlt">Fe</span> protein is suggested by normal mode analysis showing correlated and anti-correlated motions between the two nitrogenase αβ halves. EPR spectra furthermore show small differences between those of resting-state and singly-reduced Mo<span class="hlt">Fe</span> protein that can be attributed to an intra-complex allosteric perturbation of the resting-state <span class="hlt">Fe</span>Mo-co in one αβ unit by reduction of <span class="hlt">Fe</span>Mo-co in the other. This work is supported as a <span class="hlt">part</span> of the Biological and Electron Transfer and Catalysis (EFRC) program, an Energy Frontiers Research Center funded by the US Department of Energy (DOE), Office of Science (DE-SC0012518) to LCS, by National Institutes of Health (NIH) grants HL 63203 and GM 111097to BMH, and R15GM110671 to EA, and by the Division of Chemical Sciences, Geosciences, and Bio-Sciences, DOE to SR</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/servlets/purl/1261062','SCIGOV-STC'); return false;" href="https://www.osti.gov/servlets/purl/1261062"><span>NEAMS-ATF M3 Milestone Report: Literature Review of <span class="hlt">Modeling</span> of Radiation-Induced Swelling in <span class="hlt">Fe</span>-Cr-Al Steels</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Bai, Xianming; Biner, Suleyman Bulent; Jiang, Chao</p> <p>2015-12-01</p> <p><span class="hlt">Fe</span>-Cr-Al steels are proposed as accident-tolerant-fuel (ATF) cladding materials in light water reactors due to their excellent oxidation resistance at high temperatures. Currently, the understanding of their performance in reactor environment is still limited. In this review, firstly we reviewed the experimental studies of <span class="hlt">Fe</span>-Cr-Al based alloys with particular focus on the radiation effects in these alloys. Although limited data are available in literature, several previous and recent experimental studies have shown that <span class="hlt">Fe</span>-Cr-Al based alloys have very good void swelling resistance at low and moderate irradiation doses but the growth of dislocation loops is very active. Overall, the behaviormore » of radiation damage evolution is similar to that in <span class="hlt">Fe</span>-Cr ferritic/martensitic alloys. Secondly, we reviewed the rate theory-based <span class="hlt">modeling</span> methods for <span class="hlt">modeling</span> the coevolution of voids and dislocation loops in materials under irradiation such as Frenkel pair three-dimensional diffusion <span class="hlt">model</span> (FP3DM) and cluster dynamics. Finally, we summarized and discussed our review and proposed our future plans for <span class="hlt">modeling</span> radiation damage in <span class="hlt">Fe</span>-Cr-Al based alloys.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017PhRvB..95f4415O','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017PhRvB..95f4415O"><span><span class="hlt">Modeling</span> the thickness dependence of the magnetic phase transition temperature in thin <span class="hlt">Fe</span>Rh films</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ostler, Thomas Andrew; Barton, Craig; Thomson, Thomas; Hrkac, Gino</p> <p>2017-02-01</p> <p><span class="hlt">Fe</span>Rh and its first-order phase transition can open new routes for magnetic hybrid materials and devices under the assumption that it can be exploited in ultra-thin-film structures. Motivated by experimental measurements showing an unexpected increase in the phase transition temperature with decreasing thickness of <span class="hlt">Fe</span>Rh on top of MgO, we develop a computational <span class="hlt">model</span> to investigate strain effects of <span class="hlt">Fe</span>Rh in such magnetic structures. Our theoretical results show that the presence of the MgO interface results in a strain that changes the magnetic configuration which drives the anomalous behavior.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014AGUFMPP51C1142B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014AGUFMPP51C1142B"><span><span class="hlt">Fe</span> Isotope Fractionation During <span class="hlt">Fe</span>(III) Reduction to <span class="hlt">Fe</span>(II)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Baker, E. A.; Greene, S.; Hardin, E. E.; Hodierne, C. E.; Rosenberg, A.; John, S.</p> <p>2014-12-01</p> <p>The redox chemistry of <span class="hlt">Fe</span>(III) and <span class="hlt">Fe</span>(II) is tied to a variety of earth processes, including biological, chemical, or photochemical reduction of <span class="hlt">Fe</span>(III) to <span class="hlt">Fe</span>(II). Each process may fractionate <span class="hlt">Fe</span> isotopes, but the magnitudes of the kinetic isotope effects have not been greatly explored in laboratory conditions. Here, we present the isotopic fractionation of <span class="hlt">Fe</span> during reduction experiments under a variety of experimental conditions including photochemical reduction of <span class="hlt">Fe</span>(III) bound to EDTA or glucaric acid, and chemical reduction of <span class="hlt">Fe</span>-EDTA by sodium dithionite, hydroxylamine hydrochloride, Mn(II), and ascorbic acid. A variety of temperatures and pHs were tested. In all experiments, <span class="hlt">Fe</span>(III) bound to an organic ligand was reduced in the presence of ferrozine. Ferrozine binds with <span class="hlt">Fe</span>(II), forming a purple complex which allows us to measure the extent of reaction. The absorbance of the experimental solutions was measured over time to determine the <span class="hlt">Fe</span>(II)-ferrozine concentration and thus the reduction rate. After about 5% of the <span class="hlt">Fe</span>(III) was reduced, <span class="hlt">Fe</span>(III)-EDTA and <span class="hlt">Fe</span>(II)-ferrozine were separated using a C-18 column to which <span class="hlt">Fe</span>(II)-ferrozine binds. The <span class="hlt">Fe</span>(II) was eluted and purified through anion exchange chromatography for analysis of δ56<span class="hlt">Fe</span> by MC-ICPMS. Preliminary results show that temperature and pH both affect reduction rate. All chemical reductants tested reduce <span class="hlt">Fe</span>(III) at a greater rate as temperature increases. The photochemical reductant EDTA reduces <span class="hlt">Fe</span>(III) at a greater rate under more acidic conditions. Comparison of the two photochemical reductants shows that glucaric acid reduces <span class="hlt">Fe</span>(III) significantly faster than EDTA. For chemical reduction, the magnitude of isotopic fractionation depends on the reductant used. Temperature and pH also affect the isotopic fractionation of <span class="hlt">Fe</span>. Experiments using chemical reductants show that an increase in temperature at low temperatures produces lighter 56<span class="hlt">Fe</span> ratios, while at high temperatures some reductants produce heavier</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016AGUOSCT14A0122S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016AGUOSCT14A0122S"><span>Can Biomass Burning Explain Isotopically Light <span class="hlt">Fe</span> in Marine Aerosols?</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Sherry, A. M.; Anbar, A. D.; Herckes, P.; Romaniello, S. J.</p> <p>2016-02-01</p> <p>Iron (<span class="hlt">Fe</span>) is an important micronutrient that limits primary productivity in large <span class="hlt">parts</span> of the ocean. In these regions, atmospheric aerosol deposition is an important source of <span class="hlt">Fe</span> to the surface ocean and thus has a critical impact on ocean biogeochemistry. <span class="hlt">Fe</span>-bearing aerosols originate from many sources with potentially distinct <span class="hlt">Fe</span> isotopic compositions. Consequently, <span class="hlt">Fe</span> isotopes may provide a new tool to trace the sources of aerosol <span class="hlt">Fe</span> to the oceans. Mead et al. (2013) first discovered that <span class="hlt">Fe</span> in the fine fraction of Bermuda aerosols is often isotopically lighter than <span class="hlt">Fe</span> from known anthropogenic and crustal sources. 1 These authors suggested that this light isotopic signature was likely the result of biomass burning, since <span class="hlt">Fe</span> in plants is the only known source of isotopically light <span class="hlt">Fe</span>. More recently, Conway et al. found that <span class="hlt">Fe</span> in the soluble fraction of aerosols collected during 2010-2011 North Atlantic GEOTRACES cruises also showed light isotope values, which they likewise attributed to biomass burning.2 These studies are further supported by new <span class="hlt">modeling</span> work which suggests that biomass burning aerosols should contribute significant amounts of soluble <span class="hlt">Fe</span> to tropical and southern oceans.3To test if biomass burning releases aerosols with a light <span class="hlt">Fe</span> isotope composition, we are conducting lab-scale biomass burning experiments using natural samples of vegetation and leaf litter. Burn aerosols were collected on cellulose filters, then digested and analyzed for trace metal concentrations using inductively-coupled mass spectrometry (ICP-MS). <span class="hlt">Fe</span> isotopes were determined by using multiple collector ICP-MS following separation and purification of <span class="hlt">Fe</span> using anion exchange chromatography. We will discuss metal concentration and isotope data from these experiments with implications for the interpretation of <span class="hlt">Fe</span> isotope signals in aerosol samples. 1Mead, C et al. GRL, 2013, 40, 5722-5727. 2 Conway, T et al. Goldschmidt Abs 2015 593. 3Ito, A. ES&T Lett, 2015, 2, 70-75.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017JMMM..430...78H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017JMMM..430...78H"><span>Kerr microscopy study of exchange-coupled <span class="hlt">FePt/Fe</span> exchange spring magnets</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hussain, Zaineb; Kumar, Dileep; Reddy, V. Raghavendra; Gupta, Ajay</p> <p>2017-05-01</p> <p>Magnetization reversal and magnetic microstructure of top soft magnetic layer (<span class="hlt">Fe</span>) in exchange spring coupled L10 <span class="hlt">FePt/Fe</span> is studied using high resolution Kerr microscopy. With remnant state of the hard magnetic layer (L10 <span class="hlt">Fe</span>Pt) as initial condition, magnetization loops along with magnetic domains are recorded for the top soft magnetic layer (<span class="hlt">Fe</span>) using Kerr microscopy. Considerable shifting of <span class="hlt">Fe</span> layer hysteresis loop from center which is similar to exchange bias phenomena is observed. It is also observed that one can tune the magnitude of hysteresis shift by reaching the remanent state from different saturating fields (HSAT) and also by varying the angle between measuring field and HSAT. The hysteresis loops and magnetic domains of top soft <span class="hlt">Fe</span> layer demonstrate unambiguously that soft magnetic layer at remanent state in such exchange coupled system is having unidirectional anisotropy. An analogy is drawn and the observations are explained in terms of established <span class="hlt">model</span> of exchange bias phenomena framed for field-cooled ferromagnetic - antiferromagnetic bilayer systems.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1317917','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1317917"><span>Modulation of the electronic structure and the Ni–<span class="hlt">Fe</span> distance in heterobimetallic <span class="hlt">models</span> for the active site in [Ni<span class="hlt">Fe</span>]hydrogenase</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Zhu, Wenfeng; Marr, Andrew C.; Wang, Qiang; Neese, Frank; Spencer, Douglas J. E.; Blake, Alexander J.; Cooke, Paul A.; Wilson, Claire; Schröder, Martin</p> <p>2005-01-01</p> <p>Reaction of the mononuclear Ni(II) thiolate complexes [Ni(L)] [L, L1, H2L1, bis(2-mercaptoethyl)-1,2-dimercaptoethane; L2, H2L2, N,N′-dimethyl-N,N′-bis(2-mercaptoethyl)-bis(aminoethyl)sulfide] with [<span class="hlt">Fe</span>Cp(CO)2I] gives the dithiolate-bridged heterobimetallic species, [Ni(L1)<span class="hlt">Fe</span>Cp(CO)]PF6, 1, and [Ni(L2)<span class="hlt">Fe</span>Cp]I, 2, respectively. Binding of a <span class="hlt">Fe</span>(CO)3 fragment via reaction of square-planar [Ni(pdt)(dppe)] (dppe, 1,2-diphenylphosphinoethane; pdt2–, 1,3-propanedithiolate) with <span class="hlt">Fe</span>3(CO)12 or [<span class="hlt">Fe</span>(CO)3(BDA)] (BDA, benzylidene acetone) affords diamagnetic [(dppe)Ni(μ-pdt)<span class="hlt">Fe</span>(CO)3], 3, in which the Ni(II) center is bound tetrahedrally to two thiolate S-donors and to two P-donors. The complex [(dppe)Ni(μ-pdt)<span class="hlt">Fe</span>(CO)3], 3, reacts in solution via rearrangement to afford [(OC)Ni(μ-dppe)(μ-pdt)<span class="hlt">Fe</span>(CO)2], 4, in which one P-donor of dppe is bound to Ni and the other to <span class="hlt">Fe</span>, and a CO ligand has transferred from <span class="hlt">Fe</span> to Ni. Additionally, the syntheses of 3 and 4 afford the side products [(dppe)Ni(CO)2] and [(OC)3<span class="hlt">Fe(pdt)Fe</span>(CO)3] together with the trinuclear species [(dppe)(CO)<span class="hlt">Fe(μ-CO)(μ-pdt)Fe(μ-pdt)Fe</span>(CO)3], 5. Reaction of [Ni(pdt)(dppe)] with [<span class="hlt">Fe</span>Cp(CO)2I] in CH2Cl2 affords two products [(dppe)Ni(μ-pdt)<span class="hlt">Fe</span>Cp(CO)]PF6, 6, and [(dppe)Ni(pdt)(μ-I)Ni(dppe)]PF6, 7. The complexes 2, 3, and 4 show Ni–<span class="hlt">Fe</span> distances of 2.539(4), 2.4666(6), and 2.4777(7) Å, respectively, with relatively acute dihedral angles of 79.5–81.8° for the Ni–S2-<span class="hlt">Fe</span> bridge, thus mimicking the shortened Ni...<span class="hlt">Fe</span> distance (2.5 Å) and the acute dihedral angle of the Ni–S2–<span class="hlt">Fe</span> moiety observed in certain active forms of [Ni<span class="hlt">Fe</span>]hydrogenase. The role of direct Ni–<span class="hlt">Fe</span> bonding in these complexes is discussed and linked to electronic structure calculations on [(dppe)Ni(pdt)<span class="hlt">Fe</span>(CO)3], 3, which confirm the presence of a bent Ni(dz2)-<span class="hlt">Fe</span>(dz2) σ-bond in a singlet ground state. PMID:16352727</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_4");'>4</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li class="active"><span>6</span></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_6 --> <div id="page_7" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li class="active"><span>7</span></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="121"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017E%26PSL.473...94M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017E%26PSL.473...94M"><span><span class="hlt">Fe-Fe</span>O and <span class="hlt">Fe-Fe</span>3C melting relations at Earth's core-mantle boundary conditions: Implications for a volatile-rich or oxygen-rich core</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Morard, G.; Andrault, D.; Antonangeli, D.; Nakajima, Y.; Auzende, A. L.; Boulard, E.; Cervera, S.; Clark, A.; Lord, O. T.; Siebert, J.; Svitlyk, V.; Garbarino, G.; Mezouar, M.</p> <p>2017-09-01</p> <p>Eutectic melting temperatures in the <span class="hlt">Fe-Fe</span>O and <span class="hlt">Fe-Fe</span>3C systems have been determined up to 150 GPa. Melting criteria include observation of a diffuse scattering signal by in situ X-Ray diffraction, and textural characterisation of recovered samples. In addition, compositions of eutectic liquids have been established by combining in situ Rietveld analyses with ex situ chemical analyses. Gathering these new results together with previous reports on <span class="hlt">Fe</span>-S and <span class="hlt">Fe</span>-Si systems allow us to discuss the specific effect of each light element (Si, S, O, C) on the melting properties of the outer core. Crystallization temperatures of Si-rich core compositional <span class="hlt">models</span> are too high to be compatible with the absence of extensive mantle melting at the core-mantle boundary (CMB) and significant amounts of volatile elements such as S and/or C (>5 at%, corresponding to >2 wt%), or a large amount of O (>15 at% corresponding to ∼5 wt%) are required to reduce the crystallisation temperature of the core material below that of a peridotitic lower mantle.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1996JAP....79.5841K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1996JAP....79.5841K"><span>Origins of giant biquadratic coupling in Co<span class="hlt">Fe/Mn/CoFe</span> sandwich structures (abstract)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Koon, Norman C.</p> <p>1996-04-01</p> <p>Recently Filipkowski et al. reported extremely strong, near 90 degree coupling of 2.5 erg/cm2 for epitaxial sandwiches of Co<span class="hlt">Fe/Mn/CoFe</span>, where the Co<span class="hlt">Fe</span> composition was chosen to be a good lattice match to Mn. Both Co<span class="hlt">Fe</span> and Mn have the bcc structure, but Mn is antiferromagnetic while Co<span class="hlt">Fe</span> is ferromagnetic. It was found that the data were very well described by a simple <span class="hlt">model</span> due to Slonczewski, in which the interlayer coupling is given by Fc=C+(φ1-φ2)2+C-(φ1-φ2-π)2. While this <span class="hlt">model</span> describes the data much better than the usual biquadratic form, it still does not connect directly to the microscopic origins of the effect. In the present work we seek to explain the results in terms of normal bilinear exchange and magnetocrystalline anisotropy, together with reasonable assumptions about the structure of the interfaces. We obtain excellent agreement with both the experimental results and the Slonczewski <span class="hlt">model</span> under the assumptions that at least one of the two Co<span class="hlt">Fe</span>/Mn interfaces is smooth (i.e., atomically flat) on a length scale comparable to or greater than the thickness of the Mn layer and at least one interface is rough on a scale less than approximately a domain wall thickness.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JPSJ...84i3703H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JPSJ...84i3703H"><span>Ab initio Studies of Magnetism in the Iron Chalcogenides <span class="hlt">Fe</span>Te and <span class="hlt">Fe</span>Se</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hirayama, Motoaki; Misawa, Takahiro; Miyake, Takashi; Imada, Masatoshi</p> <p>2015-09-01</p> <p>The iron chalcogenides <span class="hlt">Fe</span>Te and <span class="hlt">Fe</span>Se belong to the family of iron-based superconductors. We study the magnetism in these compounds in the normal state using the ab initio downfolding scheme developed for strongly correlated electron systems. In deriving ab initio low-energy effective <span class="hlt">models</span>, we employ the constrained GW method to eliminate the double counting of electron correlations originating from the exchange correlations already taken into account in the density functional theory. By solving the derived ab initio effective <span class="hlt">models</span>, we reveal that the elimination of the double counting is important in reproducing the bicollinear antiferromagnetic order in <span class="hlt">Fe</span>Te, as is observed in experiments. We also show that the elimination of the double counting induces a unique degeneracy of several magnetic orders in <span class="hlt">Fe</span>Se, which may explain the absence of the magnetic ordering. We discuss the relationship between the degeneracy and the recently found puzzling phenomena in <span class="hlt">Fe</span>Se as well as the magnetic ordering found under pressure.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/17118544','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/17118544"><span>Comparison of reductive dechlorination of p-chlorophenol using <span class="hlt">Fe</span>0 and nanosized <span class="hlt">Fe</span>0.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Cheng, Rong; Wang, Jian-Long; Zhang, Wei-xian</p> <p>2007-06-01</p> <p>Chlorophenols, as a kind of important contaminants in groundwater, are toxic and difficult to biodegrade. Laboratory tests were conducted to examine zero-valent iron as an enhancing agent in the dechlorination of chlorinated organic compounds. Nanoscale iron particles were synthesized from common precursors KBH(4) and <span class="hlt">Fe</span>SO(4). Batch experiments were performed to investigate the reduction of p-chlorophenol (4-CP) by both common <span class="hlt">Fe</span>(0) and nanoscale <span class="hlt">Fe</span>(0). Comparison of 300 mesh/100 mesh/commercial reductive iron powders showed that size of iron particles played an important role in reduction process. Initial concentration and pretreatment of iron particles also influenced the chlorination rate. Nanoscale <span class="hlt">Fe</span>(0) offered much more advantages for treatment of 4-CP compared with common iron particles, such as stability and durability. And they can be used to treat contaminants in groundwater over a long time. Among different <span class="hlt">parts</span> of synthesized nanoscale iron particle solution, the very fine particles were the major agent for treatment of pollutants. As for preservation of nanoscale <span class="hlt">Fe</span>(0), ethanol was recommended.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013JPhD...46l5304K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013JPhD...46l5304K"><span>Negative capacitance in (<span class="hlt">Fe</span>CoZr)-(PZT) nanocomposite films</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kołtunowicz, T. N.; Fedotova, J. A.; Zhukowski, P.; Saad, A.; Fedotov, A.; Kasiuk, J. V.; Larkin, A. V.</p> <p>2013-03-01</p> <p>In this work, attention was focused on the inductive contribution to the real <span class="hlt">part</span> of admittance G(T, f) in (<span class="hlt">Fe</span>0.45Co0.45Zr0.10)x(PZT)(1-x) nanocomposite films deposited in a mixed argon-oxygen atmosphere. The observed G(x, f, T) dependences for the films on the dielectric side of the insulator-metal transition demonstrated the negative capacitance (NC) effect that was maximal for the nanocomposites with 0.40 < x < 0.60, where the metallic <span class="hlt">Fe</span>CoZr nanoparticles were totally oxidized. The NC effect was explained by a specially developed <span class="hlt">model</span> for the ac hopping conductance of the electrons between the fully oxidized nanoparticles embedded in the PZT matrix. In accordance with the <span class="hlt">model</span>, under the determined conditions the observed structure of nanocomposites led to an increase in the hopping electron mean lifetime on nanoparticles and hence to the possibility of positive angles of the phase shifts θ and a proper NC (inductive-like contribution) effect.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017npjQM...2...20K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017npjQM...2...20K"><span>Realizing Haldane <span class="hlt">model</span> in <span class="hlt">Fe</span>-based honeycomb ferromagnetic insulators</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kim, Heung-Sik; Kee, Hae-Young</p> <p>2017-12-01</p> <p>The topological Haldane <span class="hlt">model</span> on a honeycomb lattice is a prototype of systems hosting topological phases of matter without external fields. It is the simplest <span class="hlt">model</span> exhibiting the quantum Hall effect without Landau levels, which motivated theoretical and experimental explorations of topological insulators and superconductors. Despite its simplicity, its realization in condensed matter systems has been elusive due to a seemingly difficult condition of spinless fermions with sublattice-dependent magnetic flux terms. While there have been theoretical proposals including elaborate atomic-scale engineering, identifying candidate topological Haldane <span class="hlt">model</span> materials has not been successful, and the first experimental realization was recently made in ultracold atoms. Here, we suggest that a series of <span class="hlt">Fe</span>-based honeycomb ferromagnetic insulators, AFe2(PO4)2 (A=Ba, Cs, K, La) possess Chern bands described by the topological Haldane <span class="hlt">model</span>. How to detect the quantum anomalous Hall effect is also discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016GeCoA.186...71V','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016GeCoA.186...71V"><span><span class="hlt">Fe</span> hydroxyphosphate precipitation and <span class="hlt">Fe</span>(II) oxidation kinetics upon aeration of <span class="hlt">Fe</span>(II) and phosphate-containing synthetic and natural solutions</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>van der Grift, B.; Behrends, T.; Osté, L. A.; Schot, P. P.; Wassen, M. J.; Griffioen, J.</p> <p>2016-08-01</p> <p> natural groundwater showed no principal differences in <span class="hlt">Fe</span>(II) oxidation kinetics and in PO4 immobilisation dynamics compared with synthetic solutions with corresponding P/<span class="hlt">Fe</span> ratio, pH and oxygen pressure. However, aeration of groundwater with relative high DOC concentrations and a low salinity lead to P-rich <span class="hlt">Fe</span> colloids that were colloidally stable. The formation of a <span class="hlt">Fe</span> hydroxyphosphate phase with a molar P/<span class="hlt">Fe</span> ratio of 0.6 can be used for predictive <span class="hlt">modelling</span> of PO4 immobilisation upon aeration of pH-neutral natural groundwater with an (P/<span class="hlt">Fe</span>)ini ratio up to 1.5. These findings provide a solid basis for further studies on transport and bioavailability of phosphorus in streams, ditches and channels that receive anoxic <span class="hlt">Fe</span>-rich groundwater.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3837848','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3837848"><span>Gallium Nitrate Is Efficacious in Murine <span class="hlt">Models</span> of Tuberculosis and Inhibits Key Bacterial <span class="hlt">Fe</span>-Dependent Enzymes</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Olakanmi, Oyebode; Kesavalu, Banurekha; Pasula, Rajamouli; Abdalla, Maher Y.; Schlesinger, Larry S.</p> <p>2013-01-01</p> <p>Acquiring iron (<span class="hlt">Fe</span>) is critical to the metabolism and growth of Mycobacterium tuberculosis. Disruption of <span class="hlt">Fe</span> metabolism is a potential approach for novel antituberculous therapy. Gallium (Ga) has many similarities to <span class="hlt">Fe</span>. Biological systems are often unable to distinguish Ga3+ from <span class="hlt">Fe</span>3+. Unlike <span class="hlt">Fe</span>3+, Ga3+ cannot be physiologically reduced to Ga2+. Thus, substituting Ga for <span class="hlt">Fe</span> in the active site of enzymes may render them nonfunctional. We previously showed that Ga inhibits growth of M. tuberculosis in broth and within cultured human macrophages. We now report that Ga(NO3)3 shows efficacy in murine tuberculosis <span class="hlt">models</span>. BALB/c SCID mice were infected intratracheally with M. tuberculosis, following which they received daily intraperitoneal saline, Ga(NO3)3, or NaNO3. All mice receiving saline or NaNO3 died. All Ga(NO3)3-treated mice survived. M. tuberculosis CFU in the lungs, liver, and spleen of the NaNO3-treated or saline-treated mice were significantly higher than those in Ga-treated mice. When BALB/c mice were substituted for BALB/c SCID mice as a chronic (nonlethal) infection <span class="hlt">model</span>, Ga(NO3)3 treatment significantly decreased lung CFU. To assess the mechanism(s) whereby Ga inhibits bacterial growth, the effect of Ga on M. tuberculosis ribonucleotide reductase (RR) (a key enzyme in DNA replication) and aconitase activities was assessed. Ga decreased M. tuberculosis RR activity by 50 to 60%, but no additional decrease in RR activity was seen at Ga concentrations that completely inhibited mycobacterial growth. Ga decreased aconitase activity by 90%. Ga(NO3)3 shows efficacy in murine M. tuberculosis infection and leads to a decrease in activity of <span class="hlt">Fe</span>-dependent enzymes. Additional work is warranted to further define Ga's mechanism of action and to optimize delivery forms for possible therapeutic uses in humans. PMID:24060870</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2008HyInt.185...47S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2008HyInt.185...47S"><span>Dimeric <span class="hlt">Fe</span> (II, III) complex of quinoneoxime as functional <span class="hlt">model</span> of PAP enzyme: Mössbauer, magneto-structural and DNA cleavage studies</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Salunke-Gawali, Sunita; Ahmed, Khursheed; Varret, François; Linares, Jorge; Zaware, Santosh; Date, Sadgopal; Rane, Sandhya</p> <p>2008-07-01</p> <p>Purple acid phosphatase, ( PAP), is known to contain dinuclear <span class="hlt">Fe</span>2 + 2, + 3 site with characteristic <span class="hlt">Fe</span> + 3 ← Tyr ligand to metal charge transfer in coordination. Phthiocoloxime (3-methyl-2-hydroxy-1,4-naphthoquinone-1-oxime) ligand L, mimics (His/Tyr) ligation with controlled and unique charge transfers resulting in valence tautomeric coordination with mixed valent diiron site in <span class="hlt">model</span> compound <span class="hlt">Fe</span>-1: [μ-OH-<span class="hlt">Fe</span>2 + 2, + 3 ( o-NQCH3ox) ( o-NSQCH3ox)2 (CAT) H2O]. <span class="hlt">Fe</span>-2: [<span class="hlt">Fe</span> + 3( o-NQCH3ox) ( p-NQCH3ox)2]2 a molecularly associated dimer of phthiocoloxime synthesized for comparison of charge transfer. 57<span class="hlt">Fe</span> Mössbauer studies was used to quantitize unusual valences due to ligand in dimeric <span class="hlt">Fe</span>-1 and <span class="hlt">Fe</span>-2 complexes which are supported by EPR and SQUID studies. 57<span class="hlt">Fe</span> Mössbauer spectra for <span class="hlt">Fe</span>-1 at 300 K indicates the presence of two quadrupole split asymmetric doublets due to the differences in local coordination geometries of [<span class="hlt">Fe</span> + 3]A and [<span class="hlt">Fe</span> + 2]B sites. The hyperfine interaction parameters are δ A = 0.152, (Δ E Q)A = 0.598 mm/s with overlapping doublet at δ B = 0.410 and (Δ E Q)B = 0.468 mm/s. Due to molecular association tendency of ligand, dimer <span class="hlt">Fe</span>-2 possesses 100% <span class="hlt">Fe</span> + 3(h.s.) hexacoordinated configuration with isomer shift δ = 0.408 mm/s. Slightly distorted octahedral symmetry created by NQCH3ox ligand surrounding <span class="hlt">Fe</span> + 3(h.s.) state generates small field gradient indicated by quadrupole split Δ E Q = 0.213 mm/s. Decrease of isomer shifts together with variation of quadrupole splits with temperature in <span class="hlt">Fe</span>-1 dimer compared to <span class="hlt">Fe</span>-2 is result of charge transfers in [<span class="hlt">Fe</span>2 + 2, + 3 SQ] complexes. EPR spectrum of <span class="hlt">Fe</span>-1 shows two strong signals at g 1 = 4.17 and g 2 = 2.01 indicative of S = 3/2 spin state with an intermediate spin of <span class="hlt">Fe</span> + 3(h.s.) configuration. SQUID data of χ _m^{corr} .T were best fitted by using HDVV spin pair <span class="hlt">model</span> S = 2, 3/2 resulting in antiferromagnetic exchange ( J = -13.5 cm - 1 with an agreement factor of R = 1.89 × 10 - 5). The lower J</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://eric.ed.gov/?q=hull&pg=4&id=EJ1002075','ERIC'); return false;" href="https://eric.ed.gov/?q=hull&pg=4&id=EJ1002075"><span>Lingfield: The Future of Professionalism in <span class="hlt">FE</span></span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Adults Learning, 2012</p> <p>2012-01-01</p> <p>The Lingfield review promises a major shake-up of professionalism in the further education (<span class="hlt">FE</span>) sector. As the dust settles and ministers consider which <span class="hlt">parts</span> of his vision to take forward and how, the journal staff ask a range of voices from across the sector for their thoughts on the emerging shape of professionalism in <span class="hlt">FE</span>. These contributors…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/28388447','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/28388447"><span>Application of UV-irradiated <span class="hlt">Fe</span>(III)-nitrilotriacetic acid (UV-<span class="hlt">Fe</span>(III)NTA) and UV-NTA-Fenton systems to degrade <span class="hlt">model</span> and natural occurring naphthenic acids.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Zhang, Ying; Chelme-Ayala, Pamela; Klamerth, Nikolaus; Gamal El-Din, Mohamed</p> <p>2017-07-01</p> <p>Naphthenic acids (NAs) are a highly complex mixture of organic compounds naturally present in bitumen and identified as the primary toxic constituent of oil sands process-affected water (OSPW). This work investigated the degradation of cyclohexanoic acid (CHA), a <span class="hlt">model</span> NA compound, and natural occurring NAs during the UV photolysis of <span class="hlt">Fe</span>(III)-nitrilotriacetic acid (UV-<span class="hlt">Fe</span>(III)NTA) and UV-NTA-Fenton processes. The results indicated that in the UV-<span class="hlt">Fe</span>(III)NTA process at pH 8, the CHA removal increased with increasing NTA dose (0.18, 0.36 and 0.72 mM), while it was independent of the <span class="hlt">Fe</span>(III) dose (0.09, 0.18 and 0.36 mM). Moreover, the three <span class="hlt">Fe</span> concentrations had no influence on the photolysis of the <span class="hlt">Fe</span>(III)NTA complex. The main responsible species for the CHA degradation was hydroxyl radical (OH), and the role of dissolved O 2 in the OH generation was found to be negligible. Real OSPW was treated with the UV-<span class="hlt">Fe</span>(III)NTA and UV-NTA-Fenton advanced oxidation processes (AOPs). The removals of classical NAs (O 2 -NAs), oxidized NAs with one additional oxygen atom (O 3 -NAs) and with two additional oxygen atoms (O 4 -NAs) were 44.5%, 21.3%, and 25.2% in the UV-<span class="hlt">Fe</span>(III)NTA process, respectively, and 98.4%, 86.0%, and 81.0% in the UV-NTA-Fenton process, respectively. There was no influence of O 2 on the NA removal in these two processes. The results also confirmed the high reactivity of the O 2 -NA species with more carbons and increasing number of rings or double bond equivalents. This work opens a new window for the possible treatment of OSPW at natural pH using these AOPs. Copyright © 2017 Elsevier Ltd. All rights reserved.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017MolPh.115.2185A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017MolPh.115.2185A"><span>Single metal catalysis: DFT and CAS <span class="hlt">modelling</span> of species involved in the <span class="hlt">Fe</span> cation assisted transformation of acetylene to benzene</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Altun, Zikri; Bleda, Erdi; Trindle, Carl</p> <p>2017-09-01</p> <p>Gas phase conversion of acetylene to benzene, assisted by a single metal cation such as <span class="hlt">Fe</span>(+), Ru(+) and Rh(+), offers an attractive prospect for application of computational <span class="hlt">modelling</span> techniques to catalytic processes. Gas phase processes are not complicated by environmental effects and the participation of a single metal atom is a significant simplification. Still the process is complex, owing to the possibility of several low-energy spin states and the abundance of alternative structures. By density functional theory <span class="hlt">modelling</span> using recently developed <span class="hlt">models</span> with range and dispersion corrections, we locate and characterise a number of extreme points on the <span class="hlt">Fe</span>C6H6(+) surface, some of which have not been described previously. These include eta-1, eta-2 and eta-3 complexes of <span class="hlt">Fe</span>(+) with the C4H4 ring. We identify new <span class="hlt">Fe</span>C6H6(+) structures as well, which may be landmarks for the <span class="hlt">Fe</span>(+)-catalysed production of benzene from acetylene. The <span class="hlt">Fe</span>(+) benzene complex is the most stable species on the <span class="hlt">Fe</span>C6H6 cation surface. With the abundant energy of complexation available in the isolated gas phase species, detachment of the <span class="hlt">Fe</span>(+) and production of benzene can be efficient. We address the issue raised by other investigators whether multi-configurational self-consistent field methods are essential to the proper description of these systems. We find that the relative energy of intrinsically multi-determinant doublets is strongly affected, but judge that the density functional theory (DFT) description provides more accurate estimates of energetics and a more plausible reaction path.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/25747808','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/25747808"><span>Novel reactions of homodinuclear Ni2 complexes [Ni(RNPyS4)]2 with <span class="hlt">Fe</span>3(CO)12 to give heterotrinuclear Ni<span class="hlt">Fe</span>2 and mononuclear <span class="hlt">Fe</span> complexes relevant to [Ni<span class="hlt">Fe</span>]- and [<span class="hlt">Fe</span>]-hydrogenases.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Song, Li-Cheng; Cao, Meng; Wang, Yong-Xiang</p> <p>2015-04-21</p> <p>The homodinuclear complexes [Ni(RNPyS4)]2 (; RNPyS4 = 2,6-bis(2-mercaptophenylthiomethyl)-4-R-pyridine; R = H, MeO, Cl, Br, i-Pr) were found to be prepared by reactions of the in situ generated Li2[Ni(1,2-S2C6H4)2] with 2,6-bis[(tosyloxy)methyl]pyridine and its substituted derivatives 2,6-bis[(tosyloxy)methyl]-4-R-pyridine. Further reactions of with <span class="hlt">Fe</span>3(CO)12 gave both heterotrinuclear complexes Ni<span class="hlt">Fe</span>2(RNPyS4)(CO)5 () and mononuclear complexes <span class="hlt">Fe</span>(RNPyS4)(CO) (), unexpectedly. Interestingly, complexes and could be regarded as <span class="hlt">models</span> for the active sites of [Ni<span class="hlt">Fe</span>]- and [<span class="hlt">Fe</span>]-hydrogenases, respectively. All the prepared complexes were characterized by elemental analysis, spectroscopy, and particularly for some of them, by X-ray crystallography. In addition, the electrochemical properties of and as well as the electrocatalytic H2 production catalyzed by and were investigated by CV techniques.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/28079958','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/28079958"><span>An S-Oxygenated [Ni<span class="hlt">Fe</span>] Complex <span class="hlt">Modelling</span> Sulfenate Intermediates of an O2 -Tolerant Hydrogenase.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Lindenmaier, Nils J; Wahlefeld, Stefan; Bill, Eckhard; Szilvási, Tibor; Eberle, Christopher; Yao, Shenglai; Hildebrandt, Peter; Horch, Marius; Zebger, Ingo; Driess, Matthias</p> <p>2017-02-13</p> <p>To understand the molecular details of O 2 -tolerant hydrogen cycling by a soluble NAD + -reducing [Ni<span class="hlt">Fe</span>] hydrogenase, we herein present the first bioinspired heterobimetallic S-oxygenated [Ni<span class="hlt">Fe</span>] complex as a structural and vibrational spectroscopic <span class="hlt">model</span> for the oxygen-inhibited [Ni<span class="hlt">Fe</span>] active site. This compound and its non-S-oxygenated congener were fully characterized, and their electronic structures were elucidated in a combined experimental and theoretical study with emphasis on the bridging sulfenato moiety. Based on the vibrational spectroscopic properties of these complexes, we also propose novel strategies for exploring S-oxygenated intermediates in hydrogenases and similar enzymes. © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2547486','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2547486"><span>Spectroscopic and Quantum Chemical Studies on low-spin <span class="hlt">Fe</span>IV=O complexes: <span class="hlt">Fe</span>-O bonding and its contributions to reactivity</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Decker, Andrea; Rohde, Jan-Uwe; Klinker, Eric J.; Wong, Shaun D.; Que, Lawrence; Solomon, Edward I.</p> <p>2008-01-01</p> <p>High valent <span class="hlt">Fe</span>IV=O species are key intermediates in the catalytic cycles of many mononuclear non-heme iron enzymes and have been structurally defined in <span class="hlt">model</span> systems. Variable temperature magnetic circular dichroism (VT-MCD) spectroscopy has been used to evaluate the electronic structures and in particular the <span class="hlt">Fe</span>-O bonds of three <span class="hlt">Fe</span>IV=O (S=1) <span class="hlt">model</span> complexes, [<span class="hlt">Fe</span>IV(O)(TMC)(NCMe)]2+, [<span class="hlt">Fe</span>IV(O)(TMC)(OC(O)CF3)]+, and [<span class="hlt">Fe</span>IV(O)(N4Py)]2+. These complexes are characterized by their strong and covalent <span class="hlt">Fe</span>-O π-bonds. The MCD spectra show a vibronic progression in the non-bonding → π* excited state, providing the <span class="hlt">Fe</span>-O stretching frequency and the <span class="hlt">Fe</span>-O bond length in this excited state and quantifying the π-contribution to the total <span class="hlt">Fe</span>-O bond. Correlation of these experimental data to reactivity shows that the [<span class="hlt">Fe</span>IV(O)(N4Py)]2+ complex, with the highest reactivity towards hydrogen-atom abstraction among the three, has the strongest <span class="hlt">Fe</span>-O π-bond. Density Functional calculations were correlated to the data and support the experimental analysis. The strength and covalency of the <span class="hlt">Fe</span>-O π-bond result in high oxygen character in the important frontier molecular orbitals (FMOs) for this reaction, the unoccupied β-spin d(xz/yz) orbitals, and activates these for electrophilic attack. An extension to biologically relevant <span class="hlt">Fe</span>IV=O (S=2) enzyme intermediates shows that these can perform electrophilic attack reactions along the same mechanistic pathway (π-FMO pathway) with similar reactivity, but also have an additional reaction channel involving the unoccupied α-spin d(z2) orbital (σ-FMO pathway). These studies experimentally probe the FMOs involved in the reactivity of <span class="hlt">Fe</span>IV=O (S=1) <span class="hlt">model</span> complexes resulting in a detailed understanding of the <span class="hlt">Fe</span>-O bond and its contributions to reactivity. PMID:18052249</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/22597776-magnetic-cluster-expansion-model-random-ordered-magnetic-face-centered-cubic-fe-ni-cr-alloys','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/22597776-magnetic-cluster-expansion-model-random-ordered-magnetic-face-centered-cubic-fe-ni-cr-alloys"><span>Magnetic cluster expansion <span class="hlt">model</span> for random and ordered magnetic face-centered cubic <span class="hlt">Fe</span>-Ni-Cr alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Lavrentiev, M. Yu., E-mail: Mikhail.Lavrentiev@ukaea.uk; Nguyen-Manh, D.; Dudarev, S. L.</p> <p></p> <p>A Magnetic Cluster Expansion <span class="hlt">model</span> for ternary face-centered cubic <span class="hlt">Fe</span>-Ni-Cr alloys has been developed, using DFT data spanning binary and ternary alloy configurations. Using this Magnetic Cluster Expansion <span class="hlt">model</span> Hamiltonian, we perform Monte Carlo simulations and explore magnetic structures of alloys over the entire range of compositions, considering both random and ordered alloy structures. In random alloys, the removal of magnetic collinearity constraint reduces the total magnetic moment but does not affect the predicted range of compositions where the alloys adopt low-temperature ferromagnetic configurations. During alloying of ordered fcc <span class="hlt">Fe</span>-Ni compounds with Cr, chromium atoms tend to replace nickel rathermore » than iron atoms. Replacement of Ni by Cr in ordered alloys with high iron content increases the Curie temperature of the alloys. This can be explained by strong antiferromagnetic <span class="hlt">Fe</span>-Cr coupling, similar to that found in bcc <span class="hlt">Fe</span>-Cr solutions, where the Curie temperature increase, predicted by simulations as a function of Cr concentration, is confirmed by experimental observations. In random alloys, both magnetization and the Curie temperature decrease abruptly with increasing chromium content, in agreement with experiment.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/20979418-ferromagnetic-resonance-investigation-prepared-nife-femn-nife-trilayer','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/20979418-ferromagnetic-resonance-investigation-prepared-nife-femn-nife-trilayer"><span>Ferromagnetic resonance investigation in as-prepared Ni<span class="hlt">Fe/FeMn/NiFe</span> trilayer</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Yuan, S. J.; Xu, K.; Yu, L. M.</p> <p>2007-06-01</p> <p>Ni<span class="hlt">Fe/FeMn/NiFe</span> trilayer prepared by dc magnetron sputtering was systematically investigated by ferromagnetic resonance technique (FMR) at room temperature. For Ni<span class="hlt">Fe/FeMn/NiFe</span> trilayer, there are two distinct resonance peaks both in in-plane and out-of-plane FMR spectra, which are attributed to the two Ni<span class="hlt">Fe</span> layers, respectively. The isotropic in-plane resonance field shift is negative for the bottom Ni<span class="hlt">Fe</span> layer, while positive for the top Ni<span class="hlt">Fe</span> layer. And, such phenomena result from the negative interfacial perpendicular anisotropy at the bottom Ni<span class="hlt">Fe/Fe</span>Mn interface and positive interfacial perpendicular anisotropy at the top <span class="hlt">FeMn/NiFe</span> interface. The linewidth of the bottom Ni<span class="hlt">Fe</span> layer is larger than that ofmore » the top Ni<span class="hlt">Fe</span> layer, which might be related to the greater exchange coupling at the bottom Ni<span class="hlt">Fe/Fe</span>Mn interface.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://eric.ed.gov/?q=intensive+AND+distribution+AND+marketing&id=ED263414','ERIC'); return false;" href="https://eric.ed.gov/?q=intensive+AND+distribution+AND+marketing&id=ED263414"><span>Black Perspectives on <span class="hlt">FE</span> Provision. A Summary Document. Further Education Unit.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Further Education Unit, London (England).</p> <p></p> <p>This summary report provides information on two surveys of views of the local black communities and Further Education (<span class="hlt">FE</span>) teachers regarding <span class="hlt">FE</span> provision. <span class="hlt">Part</span> I offers background. <span class="hlt">Part</span> II highlights these common themes: (1) the context is one of a black population exposed to acute economic and social disadvantage; (2) a serious information gap…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009BGeo....6.2041Y','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009BGeo....6.2041Y"><span>A <span class="hlt">model</span> of <span class="hlt">Fe</span> speciation and biogeochemistry at the Tropical Eastern North Atlantic Time-Series Observatory site</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ye, Y.; Völker, C.; Wolf-Gladrow, D. A.</p> <p>2009-10-01</p> <p>A one-dimensional <span class="hlt">model</span> of <span class="hlt">Fe</span> speciation and biogeochemistry, coupled with the General Ocean Turbulence <span class="hlt">Model</span> (GOTM) and a NPZD-type ecosystem <span class="hlt">model</span>, is applied for the Tropical Eastern North Atlantic Time-Series Observatory (TENATSO) site. Among diverse processes affecting <span class="hlt">Fe</span> speciation, this study is focusing on investigating the role of dust particles in removing dissolved iron (DFe) by a more complex description of particle aggregation and sinking, and explaining the abundance of organic <span class="hlt">Fe</span>-binding ligands by <span class="hlt">modelling</span> their origin and fate. The vertical distribution of different particle classes in the <span class="hlt">model</span> shows high sensitivity to changing aggregation rates. Using the aggregation rates from the sensitivity study in this work, <span class="hlt">modelled</span> particle fluxes are close to observations, with dust particles dominating near the surface and aggregates deeper in the water column. POC export at 1000 m is a little higher than regional sediment trap measurements, suggesting further improvement of <span class="hlt">modelling</span> particle aggregation, sinking or remineralisation. <span class="hlt">Modelled</span> strong ligands have a high abundance near the surface and decline rapidly below the deep chlorophyll maximum, showing qualitative similarity to observations. Without production of strong ligands, phytoplankton concentration falls to 0 within the first 2 years in the <span class="hlt">model</span> integration, caused by strong <span class="hlt">Fe</span>-limitation. A nudging of total weak ligands towards a constant value is required for reproducing the observed nutrient-like profiles, assuming a decay time of 7 years for weak ligands. This indicates that weak ligands have a longer decay time and therefore cannot be <span class="hlt">modelled</span> adequately in a one-dimensional <span class="hlt">model</span>. The <span class="hlt">modelled</span> DFe profile is strongly influenced by particle concentration and vertical distribution, because the most important removal of DFe in deeper waters is colloid formation and aggregation. Redissolution of particulate iron is required to reproduce an observed DFe profile at TENATSO site</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20020073031','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20020073031"><span>Relativistic Radiative and Auger Rates for <span class="hlt">Fe</span> XXIV</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Bautista, M. A.; Mendoza, C.; Kallman, T. R.; Palmeri, P.; White, Nicholas E. (Technical Monitor)</p> <p>2002-01-01</p> <p>As <span class="hlt">part</span> of a project to compute improved atomic data for the spectral <span class="hlt">modeling</span> of iron K lines, we report extensive calculations and comparisons of radiative and Auger rates for transitions involving the K-vacancy states in <span class="hlt">Fe</span> XXIV. By making use of several computational codes, a detailed study is carried out of orbital representation, configuration interaction, relativistic corrections, cancellation effects, and fine tuning. It is shown that a formal treatment of the Breit interaction is essential to render the important magnetic correlations that take <span class="hlt">part</span> in the decay pathways of this ion. As a result, the accuracy of the present A-values is firmly ranked at better than 10% while that of the Auger rates at only 15%.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_5");'>5</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li class="active"><span>7</span></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_7 --> <div id="page_8" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li class="active"><span>8</span></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="141"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/29453092','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/29453092"><span>Silicon induced <span class="hlt">Fe</span> deficiency affects <span class="hlt">Fe</span>, Mn, Cu and Zn distribution in rice (Oryza sativa L.) growth in calcareous conditions.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Carrasco-Gil, Sandra; Rodríguez-Menéndez, Sara; Fernández, Beatriz; Pereiro, Rosario; de la Fuente, Vicenta; Hernandez-Apaolaza, Lourdes</p> <p>2018-04-01</p> <p>A protective effect by silicon in the amelioration of iron chlorosis has recently been proved for Strategy 1 species, at acidic pH. However in calcareous conditions, the Si effect on <span class="hlt">Fe</span> acquisition and distribution is still unknown. In this work, the effect of Si on <span class="hlt">Fe</span>, Mn, Cu and Zn distribution was studied in rice (Strategy 2 species) under <span class="hlt">Fe</span> sufficiency and deficiency. Plants (+Si or-Si) were grown initially with <span class="hlt">Fe</span>, and then <span class="hlt">Fe</span> was removed from the nutrient solution. The plants were then analysed using a combined approach including LA-ICP-MS images for each element of interest, the analysis of the <span class="hlt">Fe</span> and Si concentration at different cell layers of root and leaf cross sections by SEM-EDX, and determining the apoplastic <span class="hlt">Fe</span>, total micronutrient concentration and oxidative stress indexes. A different Si effect was observed depending on plant <span class="hlt">Fe</span> status. Under <span class="hlt">Fe</span> sufficiency, Si supply increased <span class="hlt">Fe</span> root plaque formation, decreasing <span class="hlt">Fe</span> concentration inside the root and increasing the oxidative stress in the plants. Therefore, <span class="hlt">Fe</span> acquisition strategies were activated, and <span class="hlt">Fe</span> translocation rate to the aerial <span class="hlt">parts</span> was increased, even under an optimal <span class="hlt">Fe</span> supply. Under <span class="hlt">Fe</span> deficiency, +Si plants absorbed <span class="hlt">Fe</span> from the plaque more rapidly than -Si plants, due to the previous activation of <span class="hlt">Fe</span> deficiency strategies during the growing period (+<span class="hlt">Fe</span> + Si). Higher <span class="hlt">Fe</span> plaque formation due to Si supply during the growing period reduced <span class="hlt">Fe</span> uptake and could activate <span class="hlt">Fe</span> deficiency strategies in rice, making it more efficient against <span class="hlt">Fe</span> chlorosis alterations. Silicon influenced Mn and Cu distribution in root. Copyright © 2018 Elsevier Masson SAS. All rights reserved.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017APS..MARV12009B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017APS..MARV12009B"><span>Progress towards an effective <span class="hlt">model</span> for <span class="hlt">Fe</span>Se from high-accuracy first-principles quantum Monte Carlo</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Busemeyer, Brian; Wagner, Lucas K.</p> <p></p> <p>While the origin of superconductivity in the iron-based materials is still controversial, the proximity of the superconductivity to magnetic order is suggestive that magnetism may be important. Our previous work has suggested that first-principles Diffusion Monte Carlo (FN-DMC) can capture magnetic properties of iron-based superconductors that density functional theory (DFT) misses, but which are consistent with experiment. We report on the progress of efforts to find simple effective <span class="hlt">models</span> consistent with the FN-DMC description of the low-lying Hilbert space of the iron-based superconductor, <span class="hlt">Fe</span>Se. We utilize a procedure outlined by Changlani et al.[1], which both produces parameter values and indications of whether the <span class="hlt">model</span> is a good description of the first-principles Hamiltonian. Using this procedure, we evaluate several <span class="hlt">models</span> of the magnetic <span class="hlt">part</span> of the Hilbert space found in the literature, as well as the Hubbard <span class="hlt">model</span>, and a spin-fermion <span class="hlt">model</span>. We discuss which interaction parameters are important for this material, and how the material-specific properties give rise to these interactions. U.S. Department of Energy, Office of Science, Office of Advanced Scientific Computing Research, Scientific Discovery through Advanced Computing (SciDAC) program under Award No. FG02-12ER46875, as well as the NSF Graduate Research Fellowship Program.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1407805-dislocation-loop-formation-model-fecral-alloys-after-neutron-irradiation-below-dpa','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1407805-dislocation-loop-formation-model-fecral-alloys-after-neutron-irradiation-below-dpa"><span>Dislocation loop formation in <span class="hlt">model</span> <span class="hlt">Fe</span>CrAl alloys after neutron irradiation below 1 dpa</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Field, Kevin G.; Briggs, Samuel A.; Sridharan, Kumar; ...</p> <p>2017-08-01</p> <p><span class="hlt">Fe</span>CrAl alloys with varying compositions and microstructures are under consideration for accident-tolerant fuel cladding, but limited details exist on dislocation loop formation and growth for this class of alloys under neutron irradiation. Four <span class="hlt">model</span> <span class="hlt">Fe</span>CrAl alloys with chromium contents ranging from 10.01 to 17.51 wt % and alunimum contents of 4.78 to 2.93 wt % were neutron irradiated to doses of 0.3–0.8 displacements per atom (dpa) at temperatures of 335–355°C. On-zone STEM imaging revealed a mixed population of black dots and larger dislocation loops with either a/2< 111 > or a< 100 > Burgers vectors. Weak composition dependencies were observedmore » and varied depending on whether the defect size, number density, or ratio of defect types was of interest. Here, the results were found to mirror those of previous studies on <span class="hlt">Fe</span>CrAl and <span class="hlt">Fe</span>Cr alloys irradiated under similar conditions, although distinct differences exist.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017JNuM..495...20F','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017JNuM..495...20F"><span>Dislocation loop formation in <span class="hlt">model</span> <span class="hlt">Fe</span>CrAl alloys after neutron irradiation below 1 dpa</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Field, Kevin G.; Briggs, Samuel A.; Sridharan, Kumar; Yamamoto, Yukinori; Howard, Richard H.</p> <p>2017-11-01</p> <p><span class="hlt">Fe</span>CrAl alloys with varying compositions and microstructures are under consideration for accident-tolerant fuel cladding, but limited details exist on dislocation loop formation and growth for this class of alloys under neutron irradiation. Four <span class="hlt">model</span> <span class="hlt">Fe</span>CrAl alloys with chromium contents ranging from 10.01 to 17.51 wt % and aluminum contents of 4.78 to 2.93 wt % were neutron irradiated to doses of 0.3-0.8 displacements per atom (dpa) at temperatures of 335-355 °C. On-zone STEM imaging revealed a mixed population of black dots and larger dislocation loops with either a / 2 〈 111 〉 or a 〈 100 〉 Burgers vectors. Weak composition dependencies were observed and varied depending on whether the defect size, number density, or ratio of defect types was of interest. Results were found to mirror those of previous studies on <span class="hlt">Fe</span>CrAl and <span class="hlt">Fe</span>Cr alloys irradiated under similar conditions, although distinct differences exist.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015SSCom.201..120D','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015SSCom.201..120D"><span>First principles calculations of the magnetic and hyperfine properties of <span class="hlt">Fe/N/Fe</span> and <span class="hlt">Fe/O/Fe</span> multilayers in the ground state of cohesive energy</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>dos Santos, A. V.; Samudio Pérez, C. A.; Muenchen, D.; Anibele, T. P.</p> <p>2015-01-01</p> <p>The ground state properties of <span class="hlt">Fe/N/Fe</span> and <span class="hlt">Fe/O/Fe</span> multilayers were investigated using the first principles calculations. The calculations were performed using the Linearized Augmented Plane Wave (LAPW) method implemented in the Wien2k code. A supercell consisting of one layer of nitride (or oxide) between two layers of <span class="hlt">Fe</span> in the bcc structure was used to <span class="hlt">model</span> the structure of the multilayer. The research in new materials also stimulated theoretical and experimental studies of iron-based nitrides due to their variety of structural and magnetic properties for the potential applications as in high strength steels and for high corrosion resistance. It is obvious from many reports that magnetic iron nitrides such as γ-<span class="hlt">Fe</span>4N and α-<span class="hlt">Fe</span>16N2 have interesting magnetic properties, among these a high magnetisation saturation and a high density crimp. However, although <span class="hlt">Fe</span>-N films and multilayers have many potential applications, they can be produced in many ways and are being extensively studied from the theoretical point of view there is no detailed knowledge of their electronic structure. Clearly, efforts to understand the influence of the nitrogen atoms on the entire electronic structure are needed as to correctly interpret the observed changes in the magnetic properties when going from <span class="hlt">Fe</span>-N bulk compounds to multilayer structures. Nevertheless, the N atoms are not solely responsible for electronics alterations in solid compounds. Theoretical results showed that <span class="hlt">Fe</span>4X bulk compounds, where X is a variable atom with increasing atomic number (Z), the nature of bonding between X and adjacent <span class="hlt">Fe</span> atoms changes from more covalent to more ionic and the magnetic moments of <span class="hlt">Fe</span> also increase for Z=7, i.e. N. This is an indicative that atoms with a Z number higher than 7, i.e., O, can produce several new alterations in the entire magnetic properties of <span class="hlt">Fe</span> multilayers. This paper presents the first results of an ab-initio electronic structure calculations, performed for <span class="hlt">Fe</span>-N and <span class="hlt">Fe</span></p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2008A%26A...477..543G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2008A%26A...477..543G"><span>Physical conditions in Ca<span class="hlt">Fe</span> interstellar clouds</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Gnaciński, P.; Krogulec, M.</p> <p>2008-01-01</p> <p>Interstellar clouds that exhibit strong Ca I and <span class="hlt">Fe</span> I lines are called Ca<span class="hlt">Fe</span> clouds. Ionisation equilibrium equations were used to <span class="hlt">model</span> the column densities of Ca II, Ca I, K I, Na I, <span class="hlt">Fe</span> I and Ti II in Ca<span class="hlt">Fe</span> clouds. We find that the chemical composition of Ca<span class="hlt">Fe</span> clouds is solar and that there is no depletion into dust grains. Ca<span class="hlt">Fe</span> clouds have high electron densities, n_e≈1 cm-3, that lead to high column densities of neutral Ca and <span class="hlt">Fe</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5626996','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5626996"><span>Syntrophomonas wolfei Uses an NADH-Dependent, Ferredoxin-Independent [<span class="hlt">FeFe</span>]-Hydrogenase To Reoxidize NADH</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Losey, Nathaniel A.; Mus, Florence; Peters, John W.; Le, Huynh M.</p> <p>2017-01-01</p> <p> involvement of reduced ferredoxin. The multimeric [<span class="hlt">FeFe</span>]-hydrogenase would produce hydrogen from NADH only when hydrogen concentrations were low. Hydrogen production from NADH by Syntrophomonas wolfei would likely cease before any detectable amount of cell growth occurred. Thus, continual hydrogen production requires the presence of a hydrogen-consuming partner to keep hydrogen concentrations low and explains, in <span class="hlt">part</span>, the obligate requirement that S. wolfei has for a hydrogen-consuming partner organism during growth on butyrate. We have successfully expressed genes encoding a multimeric [<span class="hlt">FeFe</span>]-hydrogenase in E. coli, demonstrating that such an approach can be advantageous to characterize complex redox proteins from difficult-to-culture microorganisms. PMID:28802265</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://ntrs.nasa.gov/search.jsp?R=19930061398&hterms=model+atomic&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Dmodel%2Batomic','NASA-TRS'); return false;" href="https://ntrs.nasa.gov/search.jsp?R=19930061398&hterms=model+atomic&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D10%26Ntt%3Dmodel%2Batomic"><span>Atomic data for a five-configuration <span class="hlt">model</span> of <span class="hlt">Fe</span> XIV</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Bhatia, A. K.; Kastner, S. O.</p> <p>1993-01-01</p> <p>Collision strengths calculated in the distorted wave approximation are presented for electron excitation of <span class="hlt">Fe</span> XIV at incident energies of 10, 20 and 30 Rydbergs. Configurations 3s(2)3p, 3s3p(2), 3s(2)3d, 3p(3), and 3s3p3d are included, comprising 40 levels, and wave function mixing coefficients are tabulated. Radiative transition rates are given for the same <span class="hlt">model</span> using the Superstructure program.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/23001032','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/23001032"><span>The catalytic center of ferritin regulates iron storage via <span class="hlt">Fe(II)-Fe</span>(III) displacement.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Honarmand Ebrahimi, Kourosh; Bill, Eckhard; Hagedoorn, Peter-Leon; Hagen, Wilfred R</p> <p>2012-11-01</p> <p>A conserved iron-binding site, the ferroxidase center, regulates the vital iron storage role of the ubiquitous protein ferritin in iron metabolism. It is commonly thought that two <span class="hlt">Fe</span>(II) simultaneously bind the ferroxidase center and that the oxidized <span class="hlt">Fe(III)-O(H)-Fe</span>(III) product spontaneously enters the cavity of ferritin as a unit. In contrast, in some bacterioferritins and in archaeal ferritins a persistent di-iron prosthetic group in this center is believed to mediate catalysis of core formation. Using a combination of binding experiments and isotopically labeled (57)<span class="hlt">Fe</span>(II), we studied two systems in comparison: the ferritin from the hyperthermophilic archaeal anaerobe Pyrococcus furiosus (PfFtn) and the eukaryotic human H ferritin (HuHF). The results do not support either of the two paradigmatic <span class="hlt">models</span>; instead they suggest a unifying mechanism in which the <span class="hlt">Fe(III)-O-Fe</span>(III) unit resides in the ferroxidase center until it is sequentially displaced by <span class="hlt">Fe</span>(II).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1350922-combined-apt-sans-investigation-phase-precipitation-neutron-irradiated-model-fecral-alloys','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1350922-combined-apt-sans-investigation-phase-precipitation-neutron-irradiated-model-fecral-alloys"><span>A combined APT and SANS investigation of α' phase precipitation in neutron-irradiated <span class="hlt">model</span> <span class="hlt">Fe</span>CrAl alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Briggs, Samuel A.; Edmondson, Philip D.; Littrell, Kenneth C.; ...</p> <p>2017-03-01</p> <p>Here, <span class="hlt">Fe</span>CrAl alloys are currently under consideration for accident-tolerant fuel cladding applications in light water reactors owing to their superior high-temperature oxidation and corrosion resistance compared to the Zr-based alloys currently employed. However, their performance could be limited by precipitation of a Cr-rich α' phase that tends to embrittle high-Cr ferritic <span class="hlt">Fe</span>-based alloys. In this study, four <span class="hlt">Fe</span>CrAl <span class="hlt">model</span> alloys with 10–18 at.% Cr and 5.8–9.3 at.% Al were neutron-irradiated to nominal damage doses up to 7.0 displacements per atom at a target temperature of 320 °C. Small angle neutron scattering techniques were coupled with atom probe tomography to assessmore » the composition and morphology of the resulting α' precipitates. It was demonstrated that Al additions partially destabilize the α' phase, generally resulting in precipitates with lower Cr contents when compared with binary <span class="hlt">Fe</span>-Cr systems. The precipitate morphology evolution with dose exhibited a transient coarsening regime akin to previously observed behavior in aged <span class="hlt">Fe</span>-Cr alloys. Similar behavior to predictions of the LSW/UOKV <span class="hlt">models</span> suggests that α' precipitation in irradiated <span class="hlt">Fe</span>CrAl is a diffusion-limited process with coarsening mechanisms similar to those in thermally aged high-Cr ferritic alloys.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2004GeCoA..68.3459H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2004GeCoA..68.3459H"><span>Decoupling of As and <span class="hlt">Fe</span> release to Bangladesh groundwater under reducing conditions. <span class="hlt">Part</span> I: Evidence from sediment profiles</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Horneman, A.; van Geen, A.; Kent, D. V.; Mathe, P. E.; Zheng, Y.; Dhar, R. K.; O'Connell, S.; Hoque, M. A.; Aziz, Z.; Shamsudduha, M.; Seddique, A. A.; Ahmed, K. M.</p> <p>2004-09-01</p> <p>This study reexamines the notion that extensive As mobilization in anoxic groundwater of Bangladesh is intimately linked to the dissolution of <span class="hlt">Fe</span> oxyhydroxides on the basis of analyses performed on a suite of freshly collected samples of aquifer material. Detailed sediment profiles extending to 40 to 70 m depth below the surface were obtained at six sites where local groundwater As concentrations were known to span a wide range. The sediment properties that were measured include (1) the proportion of <span class="hlt">Fe</span>(II) in the <span class="hlt">Fe</span> fraction leached in hot 1.2 N HCl, (2) diffuse spectral reflectance, and (3) magnetic susceptibility. In parallel with local concentrations of dissolved As ranging from <5 to 600 μg/L, <span class="hlt">Fe(II)/Fe</span> ratios in shallow (gray) Holocene sands tended to gradually increase with depth from values of 0.3 to 0.5 to up to 0.9. In deeper (orange) aquifers of presumed Pleistocene age that were separated from shallow sands by a clay layer and contained <5 μg/L dissolved As, leachable <span class="hlt">Fe(II)/Fe</span> ratios averaged ˜0.2. There was no consistent relation between sediment <span class="hlt">Fe(II)/Fe</span> and dissolved <span class="hlt">Fe</span> concentrations in groundwater in nearby wells. The reflectance measurements indicate a systematic linear relation (R 2 of 0.66; n = 151) between the first derivative transform of the reflectance at 520 nm and <span class="hlt">Fe(II)/Fe</span>. The magnetic susceptibility of the shallow aquifer sands ranged from 200 to 3600 (x 10 -9 m 3/kg SI) and was linearly related (R 2 of 0.75; n = 29) to the concentrations of minerals that could be magnetically separated (0.03 to 0.79% dry weight). No systematic depth trends in magnetic susceptibility were observed within the shallow sands, although the susceptibility of deeper low-As aquifers was low (up to ˜200 × 10 -9 m 3/kg SI). This set of observations, complemented by incubation results described in a companion paper by van Geen et al. (this volume), suggests that the release of As is linked to the transformation of predominantly <span class="hlt">Fe</span> (III) oxyhydroxide</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ars.usda.gov/research/publications/publication/?seqNo115=241951','TEKTRAN'); return false;" href="http://www.ars.usda.gov/research/publications/publication/?seqNo115=241951"><span>Purified glycosaminoglycans from cooked haddock may enhance <span class="hlt">Fe</span> uptake via endocytosis in a Caco-2 cell culture <span class="hlt">model</span></span></a></p> <p><a target="_blank" href="https://www.ars.usda.gov/research/publications/find-a-publication/">USDA-ARS?s Scientific Manuscript database</a></p> <p></p> <p></p> <p>This study aims to understand the enhancing effect of glycosaminoglycans (GAGs), such as chondroitin/dermatan structures, on <span class="hlt">Fe</span> uptake to Caco-2 cells. High sulfated GAGs were selectively purified from cooked haddock. An in vitro digestion/Caco-2 cell culture <span class="hlt">model</span> was used to evaluate <span class="hlt">Fe</span> uptake (ce...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018E%26PSL.482..147K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018E%26PSL.482..147K"><span>The thermal evolution of Mercury's <span class="hlt">Fe</span>-Si core</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Knibbe, Jurriën Sebastiaan; van Westrenen, Wim</p> <p>2018-01-01</p> <p>We have studied the thermal and magnetic field evolution of planet Mercury with a core of <span class="hlt">Fe</span>-Si alloy to assess whether an <span class="hlt">Fe</span>-Si core matches its present-day partially molten state, Mercury's magnetic field strength, and the observed ancient crustal magnetization. The main advantages of an <span class="hlt">Fe</span>-Si core, opposed to a previously assumed <span class="hlt">Fe</span>-S core, are that a Si-bearing core is consistent with the highly reduced nature of Mercury and that no compositional convection is generated upon core solidification, in agreement with magnetic field indications of a stable layer at the top of Mercury's core. This study also present the first implementation of a conductive temperature profile in the core where heat fluxes are sub-adiabatic in a global thermal evolution <span class="hlt">model</span>. We show that heat migrates from the deep core to the outer <span class="hlt">part</span> of the core as soon as heat fluxes at the outer core become sub-adiabatic. As a result, the deep core cools throughout Mercury's evolution independent of the temperature evolution at the core-mantle boundary, causing an early start of inner core solidification and magnetic field generation. The conductive layer at the outer core suppresses the rate of core growth after temperature differences between the deep and shallow core are relaxed, such that a magnetic field can be generated until the present. Also, the outer core and mantle operate at higher temperatures than previously thought, which prolongs mantle melting and mantle convection. The results indicate that S is not a necessary ingredient of Mercury's core, bringing bulk compositional <span class="hlt">models</span> of Mercury more in line with reduced meteorite analogues.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016APS..MAR.R5005M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016APS..MAR.R5005M"><span>Mechanically - induced disorder in Ca<span class="hlt">Fe</span>2As2: a 57<span class="hlt">Fe</span> Mössbauer study</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ma, Xiaoming; Ran, Sheng; Canfield, Paul C.; Bud'Ko, Sergey L.</p> <p></p> <p>57 <span class="hlt">Fe</span> Mössbauer spectroscopy was used to study an extremely pressure and strain sensitive compound, Ca<span class="hlt">Fe</span>2As2, with different degrees of strain introduced by grinding and annealing. At the base temperature, in the antiferromagnetic/orthorhombic phase, compared to a sharp sextet Mössbauer spectrum of single crystal Ca<span class="hlt">Fe</span>2As2, which is taken as an un-strained sample, an obviously broadened sextet and an extra doublet were observed for ground Ca<span class="hlt">Fe</span>2As2 powders with different degrees of strain. The Mössbauer results suggest that the magnetic phase transition of Ca<span class="hlt">Fe</span>2As2 can be inhomogeneously suppressed by the grinding induced strain to such an extent that the antiferromagnetic order in <span class="hlt">parts</span> of the grains forming the powdered sample remain absent all the way down to 4.6 K. However, strain has almost no effect on the temperature dependent hyperfine magnetic field in the grains with magnetic order. The quadrupole shift in the magnetic phase approachs zero with increasing degrees of strain, indicating that the strain reduces the average lattice asymmetry at <span class="hlt">Fe</span> atom position. Supported by US DOE under the Contract No. DE-AC02-07CH11358 and by the China Scholarship Council.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1986PCM....13...31W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1986PCM....13...31W"><span>X-ray K-edge absorption spectra of <span class="hlt">Fe</span> minerals and <span class="hlt">model</span> compounds: II. EXAFS</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Waychunas, Glenn A.; Brown, Gordon E.; Apted, Michael J.</p> <p>1986-01-01</p> <p>K-edge extended X-ray absorption fine structure (EXAFS) spectra of <span class="hlt">Fe</span> in varying environments in a suite of well-characterized silicate and oxide minerals were collected using synchrotron radiation and analyzed using single scattering approximation theory to yield nearest neighbor <span class="hlt">Fe</span>-O distances and coordination numbers. The partial inverse character of synthetic hercynite spinal was verified in this way. Comparison of the results from all samples with structural data from X-ray diffraction crystal structure refinements indicates that EXAFS-derived first neighbor distances are generally accurate to ±0.02 Å using only theoretically generated phase information, and may be improved over this if similar <span class="hlt">model</span> compounds are used to determine EXAFS phase functions. Coordination numbers are accurate to ±20 percent and can be similarly improved using <span class="hlt">model</span> compound EXAFS amplitude information. However, in particular cases the EXAFS-derived distances may be shortened, and the coordination number reduced, by the effects of static and thermal disorder or by partial overlap of the longer <span class="hlt">Fe</span>-O first neighbor distances with second neighbor distances in the EXAFS structure function. In the former case the total information available in the EXAFS is limited by the disorder, while in the latter case more accurate results can in principle be obtained by multiple neighbor EXAFS analysis. The EXAFS and XANES spectra of <span class="hlt">Fe</span> in Nain, Labrador osumulite and Lakeview, Oregon plagioclase are also analyzed as an example of the application of X-ray absorption spectroscopy to metal ion site occupation determination in minerals.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018CoMP..173...20U','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018CoMP..173...20U"><span>Behaviour of <span class="hlt">Fe</span>4O5-Mg2<span class="hlt">Fe</span>2O5 solid solutions and their relation to coexisting Mg-<span class="hlt">Fe</span> silicates and oxide phases</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Uenver-Thiele, Laura; Woodland, Alan B.; Miyajima, Nobuyoshi; Ballaran, Tiziana Boffa; Frost, Daniel J.</p> <p>2018-03-01</p> <p>Experiments at high pressures and temperatures were carried out (1) to investigate the crystal-chemical behaviour of <span class="hlt">Fe</span>4O5-Mg2<span class="hlt">Fe</span>2O5 solid solutions and (2) to explore the phase relations involving (Mg,<span class="hlt">Fe</span>)2<span class="hlt">Fe</span>2O5 (denoted as O5-phase) and Mg-<span class="hlt">Fe</span> silicates. Multi-anvil experiments were performed at 11-20 GPa and 1100-1600 °C using different starting compositions including two that were Si-bearing. In Si-free experiments the O5-phase coexists with <span class="hlt">Fe</span>2O3, hp-(Mg,<span class="hlt">Fe)Fe</span>2O4, (Mg,<span class="hlt">Fe</span>)3<span class="hlt">Fe</span>4O9 or an unquenchable phase of different stoichiometry. Si-bearing experiments yielded phase assemblages consisting of the O5-phase together with olivine, wadsleyite or ringwoodite, majoritic garnet or <span class="hlt">Fe</span>3+-bearing phase B. However, (Mg,<span class="hlt">Fe</span>)2<span class="hlt">Fe</span>2O5 does not incorporate Si. Electron microprobe analyses revealed that phase B incorporates significant amounts of <span class="hlt">Fe</span>2+ and <span class="hlt">Fe</span>3+ (at least 1.0 cations <span class="hlt">Fe</span> per formula unit). <span class="hlt">Fe</span>-L2,3-edge energy-loss near-edge structure spectra confirm the presence of ferric iron [<span class="hlt">Fe</span>3+/Fetot = 0.41(4)] and indicate substitution according to the following charge-balanced exchange: [4]Si4+ + [6]Mg2+ = 2<span class="hlt">Fe</span>3+. The ability to accommodate <span class="hlt">Fe</span>2+ and <span class="hlt">Fe</span>3+ makes this potential "water-storing" mineral interesting since such substitutions should enlarge its stability field. The thermodynamic properties of Mg2<span class="hlt">Fe</span>2O5 have been refined, yielding H°1bar,298 = - 1981.5 kJ mol- 1. Solid solution is complete across the <span class="hlt">Fe</span>4O5-Mg2<span class="hlt">Fe</span>2O5 binary. Molar volume decreases essentially linearly with increasing Mg content, consistent with ideal mixing behaviour. The partitioning of Mg and <span class="hlt">Fe</span>2+ with silicates indicates that (Mg,<span class="hlt">Fe</span>)2<span class="hlt">Fe</span>2O5 has a strong preference for <span class="hlt">Fe</span>2+. <span class="hlt">Modelling</span> of partitioning with olivine is consistent with the O5-phase exhibiting ideal mixing behaviour. Mg-<span class="hlt">Fe</span>2+ partitioning between (Mg,<span class="hlt">Fe</span>)2<span class="hlt">Fe</span>2O5 and ringwoodite or wadsleyite is influenced by the presence of <span class="hlt">Fe</span>3+ and OH incorporation in the silicate phases.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017AGUFM.B31E2035N','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017AGUFM.B31E2035N"><span>A subsurface <span class="hlt">Fe</span>-silicate weathering microbiome</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Napieralski, S. A.; Buss, H. L.; Roden, E. E.</p> <p>2017-12-01</p> <p>Traditional <span class="hlt">models</span> of microbially mediated weathering of primary <span class="hlt">Fe</span>-bearing minerals often invoke organic ligands (e.g. siderophores) used for nutrient acquisition. However, it is well known that the oxidation of <span class="hlt">Fe</span>(II) governs the overall rate of <span class="hlt">Fe</span>-silicate mineral dissolution. Recent work has demonstrated the ability of lithtrophic iron oxidizing bacteria (<span class="hlt">Fe</span>OB) to grow via the oxidation of structural <span class="hlt">Fe</span>(II) in biotite as a source of metabolic energy with evidence suggesting a direct enzymatic attack on the mineral surface. This process necessitates the involvement of dedicated outer membrane proteins that interact with insoluble mineral phases in a process known as extracellular electron transfer (EET). To investigate the potential role <span class="hlt">Fe</span>OB in a terrestrial subsurface weathering system, samples were obtained from the bedrock-saprolite interface (785 cm depth) within the Rio Icacos Watershed of the Luquillo Mountains in Puerto Rico. Prior geochemical evidence suggests the flux of <span class="hlt">Fe</span>(II) from the weathering bedrock supports a robust lithotrophic microbial community at depth. Current work confirms the activity of microorganism in situ, with a marked increase in ATP near the bedrock-saprolite interface. Regolith recovered from the interface was used as inoculum to establish enrichment cultures with powderized <span class="hlt">Fe</span>(II)-bearing minerals serving as the sole energy source. Monitoring of the <span class="hlt">Fe(II)/Fe</span>(total) ratio and ATP generation suggests growth of microorganisms coupled to the oxidation of mineral bound <span class="hlt">Fe</span>(II). Analysis of 16S rRNA gene and shotgun metagenomic libraries from in situ and enrichment culture samples lends further support to <span class="hlt">Fe</span>OB involvement in the weathering process. Multiple metagenomic bins related to known <span class="hlt">Fe</span>OB, including Betaproteobacteria genera, contain homologs to <span class="hlt">model</span> EET systems, including Cyc2 and MtoAB. Our approach combining geochemistry and metagenomics with ongoing microbiological and genomic characterization of novel isolates obtained</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012cosp...39..989K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012cosp...39..989K"><span>Local factors modify the dose dependence of 56<span class="hlt">Fe</span>-induced atherosclerosis.</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kucik, Dennis; Gupta, Kiran; Wu, Xing; Yu, Tao; Chang, Polly; Kabarowski, Janusz; Yu, Shaohua</p> <p>2012-07-01</p> <p>Radiation exposure from a number of terrestrial sources is associated with an increased risk of cardiovascular disease, but evidence establishing whether high-LET radiation has similar effects has been lacking. We recently demonstrated that 600 MeV/n 56<span class="hlt">Fe</span> induces atherosclerosis as well. Ten-week old male apolipoprotein-E deficient mice, a well-characterized atherosclerosis animal <span class="hlt">model</span>, were exposed to 0 (control) 2, or 5Gy 56<span class="hlt">Fe</span> targeted to the chest and neck. In these mice, 56<span class="hlt">Fe</span>-induced atherosclerosis was similar in character to that induced by X-rays in the same mouse <span class="hlt">model</span> and to that resulting from therapeutic radiation in cancer patients. Atherosclerosis was exacerbated by 56<span class="hlt">Fe</span> only in targeted areas, however, suggesting a direct effect of the radiation on the arteries themselves. This is in contrast to some other risk factors, such as high cholesterol or tobacco use, which have systemic effects. The radiation dose required to accelerate development of atherosclerotic plaques, however, differed depending on the vessel that was irradiated and even the location within the vessel. For example, atherosclerosis in the aortic arch was accelerated only by the highest dose (5 Gy), while the carotid arteries and the aortic root showed effects at 2 Gy (a dose four- to eight-fold lower than the dose of X-rays that produces similar effects in this <span class="hlt">model</span>). Since shear stress is disrupted in the area of the aortic root, it is likely that at least <span class="hlt">part</span> of the site-specificity is due to additive or synergistic effects of radiation and local hydrodynamics. Other factors, such as local oxidative stress or gene expression may also have been involved. Since the pro-atherogenic effects of 56<span class="hlt">Fe</span> depend on additional local factors, this suggests that radiation exposure, when unavoidable, might be mitigated by modification of factors unrelated to the radiation itself.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JOM....67i2055P','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JOM....67i2055P"><span>Development of Simultaneous Corrosion Barrier and Optimized Microstructure in <span class="hlt">Fe</span>CrAl Heat-Resistant Alloy for Energy Applications. <span class="hlt">Part</span> II: The Optimized Creep-Resistant Microstructure</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Pimentel, G.; Aranda, M. M.; Chao, J.; González-Carrasco, J. L.; Capdevila, C.</p> <p>2015-09-01</p> <p>The first <span class="hlt">part</span> of this two-<span class="hlt">part</span> study reported the possibility of simultaneously generating a dense, self-healing α-alumina layer by thermal oxidation and a coarse-grained microstructure with a potential goodness for high-temperature creep resistance in a <span class="hlt">Fe</span>CrAl oxide dispersion-strengthened ferritic alloy that was cold deformed after hot rolling and extrusion. In this second <span class="hlt">part</span>, the factors affecting the formation of the coarse-grained microstructure such as strain gradients induced during the rolling process are analyzed. It is concluded that larger strain gradients lead to more refined and more isotropic grain structures.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010AGUFMMR21A1986G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010AGUFMMR21A1986G"><span>The Partial Molar Volume and Compressibility of the <span class="hlt">Fe</span>O Component in <span class="hlt">Model</span> Basalts (Mixed CaAl2Si2O8-CaMgSi2O6-Ca<span class="hlt">Fe</span>Si2O6 Liquids) at 0 GPa: evidence of <span class="hlt">Fe</span>2+ in 6-fold coordination</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Guo, X.; Lange, R. A.; Ai, Y.</p> <p>2010-12-01</p> <p><span class="hlt">Fe</span>O is an important component in magmatic liquids and yet its partial molar volume at one bar is not as well known as that for <span class="hlt">Fe</span>2O3 because of the difficulty of performing double-bob density measurements under reducing conditions. Moreover, there is growing evidence from spectroscopic studies that <span class="hlt">Fe</span>2+ occurs in 4, 5, and 6-fold coordination in silicate melts, and it is expected that the partial molar volume and compressibility of the <span class="hlt">Fe</span>O component will vary accordingly. We have conducted both density and relaxed sound speed measurements on four liquids in the An-Di-Hd (CaAl2Si2O8-CaMgSi2O6-Ca<span class="hlt">Fe</span>Si2O6) system: (1) Di-Hd (50:50), (2) An-Hd (50:50), (3) An-Di-Hd (33:33:33) and (4) Hd (100). Densities were measured between 1573 and 1838 K at one bar with the double-bob Archimedean method using molybdenum bobs and crucibles in a reducing gas (1%CO-99%Ar) environment. The sound speeds were measured under similar conditions with a frequency-sweep acoustic interferometer, and used to calculate isothermal compressibility. All the density data for the three multi-component (<span class="hlt">model</span> basalt) liquids were combined with density data on SiO2-Al2O3-CaO-MgO-K2O-Na2O liquids (Lange, 1997) in a fit to a linear volume equation; the results lead to a partial molar volume (±1σ) for <span class="hlt">Fe</span>O =11.7 ± 0.3(±1σ) cm3/mol at 1723 K. This value is similar to that for crystalline <span class="hlt">Fe</span>O at 298 K (halite structure; 12.06 cm3/mol), which suggests an average <span class="hlt">Fe</span>2+ coordination of ~6 in these <span class="hlt">model</span> basalt compositions. In contrast, the fitted partial molar volume of <span class="hlt">Fe</span>O in pure hedenbergite liquid is 14.6 ± 0.3 at 1723 K, which is consistent with an average <span class="hlt">Fe</span>2+ coordination of 4.3 derived from EXAFS spectroscopy (Rossano, 2000). Similarly, all the compressibility data for the three multi-component liquids were combined with compressibility data on SiO2-Al2O3-CaO-MgO liquids (Ai and Lange, 2008) in a fit to an ideal mixing <span class="hlt">model</span> for melt compressibility; the results lead to a partial molar</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_6");'>6</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li class="active"><span>8</span></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_8 --> <div id="page_9" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li class="active"><span>9</span></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="161"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018JMMM..454..139O','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018JMMM..454..139O"><span>Weak ferromagnetism along the third-order axis of the <span class="hlt">Fe</span>BO3 crystals caused by <span class="hlt">Fe</span>2+ impurity ions</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ovchinnikov, S. G.; Rudenko, V. V.; Vorotynov, A. M.</p> <p>2018-05-01</p> <p>Using the single-ion approximation, the weak ferromagnetic moment σZ(<span class="hlt">Fe</span>2+) along the third-order axis of <span class="hlt">Fe</span>BO3 crystals, which is caused by the contribution of <span class="hlt">Fe</span>2+ ions, has been investigated in the framework of the <span class="hlt">model</span> <span class="hlt">Fe</span>2+ impurity ion -BO3 vacancy. The extreme low-temperature behavior of the total magnetic moment due to the strong dependence of the <span class="hlt">Fe</span>2+ion contribution is predicted.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018JQSRT.211...78R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018JQSRT.211...78R"><span>Linearized Flux Evolution (Li<span class="hlt">FE</span>): A technique for rapidly adapting fluxes from full-physics radiative transfer <span class="hlt">models</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Robinson, Tyler D.; Crisp, David</p> <p>2018-05-01</p> <p>Solar and thermal radiation are critical aspects of planetary climate, with gradients in radiative energy fluxes driving heating and cooling. Climate <span class="hlt">models</span> require that radiative transfer tools be versatile, computationally efficient, and accurate. Here, we describe a technique that uses an accurate full-physics radiative transfer <span class="hlt">model</span> to generate a set of atmospheric radiative quantities which can be used to linearly adapt radiative flux profiles to changes in the atmospheric and surface state-the Linearized Flux Evolution (Li<span class="hlt">FE</span>) approach. These radiative quantities describe how each <span class="hlt">model</span> layer in a plane-parallel atmosphere reflects and transmits light, as well as how the layer generates diffuse radiation by thermal emission and by scattering light from the direct solar beam. By computing derivatives of these layer radiative properties with respect to dynamic elements of the atmospheric state, we can then efficiently adapt the flux profiles computed by the full-physics <span class="hlt">model</span> to new atmospheric states. We validate the Li<span class="hlt">FE</span> approach, and then apply this approach to Mars, Earth, and Venus, demonstrating the information contained in the layer radiative properties and their derivatives, as well as how the Li<span class="hlt">FE</span> approach can be used to determine the thermal structure of radiative and radiative-convective equilibrium states in one-dimensional atmospheric <span class="hlt">models</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1999GeCoA..63.2247D','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1999GeCoA..63.2247D"><span>Iron(III) solubility and speciation in aqueous solutions. experimental study and <span class="hlt">modelling</span>: <span class="hlt">part</span> 1. hematite solubility from 60 to 300°C in NaOH-NaCl solutions and thermodynamic properties of <span class="hlt">Fe</span>(OH) 4 -(aq)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Diakonov, Igor I.; Schott, Jacques; Martin, Francois; Harrichourry, Jean-Claude; Escalier, Jocelyne</p> <p>1999-08-01</p> <p>The solubility of natural and synthetic hematite (α-<span class="hlt">Fe</span> 2O 3) was measured in NaOH-NaCl solutions (0.007 ≤ m(NaOH) ≤ 2.0) between 60 and 300°C at saturated water vapour pressure and under excess oxygen. Solubility constants determined in the present study and by Yishan et al. (1986) at 300°C were combined with the thermodynamic properties of hematite (Hemingway, 1990) and water (SUPCRT92, Johnson et al., 1992) to generate within the framework of the revised Helgeson-Kirkham-Flowers (HKF) <span class="hlt">model</span> the standard partial molal thermodynamic properties at 25°C and 1 bar, and the revised HKF equations of state parameters of <span class="hlt">Fe</span>(OH) 4 -. The extrapolated value for the Gibbs energy of formation for <span class="hlt">Fe</span>(OH) 4 - at 25°C is -201.97 kcal/mol. Thermodynamic calculations show that <span class="hlt">Fe</span>(OH) 4 - exhibits a chemical behaviour different from that of Ga(OH) 4 - and Al(OH) 4 -.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1436158-accumulation-fe-oxyhydroxides-peruvian-oxygen-deficient-zone-implies-non-oxygen-dependent-fe-oxidation','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1436158-accumulation-fe-oxyhydroxides-peruvian-oxygen-deficient-zone-implies-non-oxygen-dependent-fe-oxidation"><span>Accumulation of <span class="hlt">Fe</span> oxyhydroxides in the Peruvian oxygen deficient zone implies non-oxygen dependent <span class="hlt">Fe</span> oxidation</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Heller, Maija I.; Lam, Phoebe J.; Moffett, James W.; ...</p> <p>2017-05-19</p> <p>Oxygen minimum zones (OMZs) have been proposed to be an important source of dissolved iron (<span class="hlt">Fe</span>) into the interior ocean. However, previous studies in OMZs have shown a sharp decrease in total dissolved <span class="hlt">Fe</span> (d<span class="hlt">Fe</span>) and/or dissolved <span class="hlt">Fe</span>(II) (d<span class="hlt">Fe</span>(II)) concentrations at the shelf-break, despite constant temperature, salinity and continued lack of oxygen across the shelf-break. The loss of both total d<span class="hlt">Fe</span> and d<span class="hlt">Fe</span>(II) suggests a conversion of the d<span class="hlt">Fe</span> to particulate form, but studies that have coupled the reduction-oxidation (redox) speciation of both dissolved and particulate phases have not previously been done. Here in this work, we have measured themore » redox speciation and concentrations of both dissolved and particulate forms of <span class="hlt">Fe</span> in samples collected during the U.S. GEOTRACES Eastern tropical Pacific Zonal Transect (EPZT) cruise in 2013 (GP16). This complete data set allows us to assess possible mechanisms for loss of d<span class="hlt">Fe</span>. We observed an offshore loss of d<span class="hlt">Fe</span>(II) within the oxygen deficient zone (ODZ), where dissolved oxygen is undetectable, accompanied by an increase in total particulate <span class="hlt">Fe</span> (p<span class="hlt">Fe</span>). Total p<span class="hlt">Fe</span> concentrations were highest in the upper ODZ. X-ray absorption spectroscopy revealed that the p<span class="hlt">Fe</span> maximum was primarily in the <span class="hlt">Fe</span>(III) form as <span class="hlt">Fe</span>(III) oxyhydroxides. The remarkable similarity in the distributions of total particulate iron and nitrite suggests a role for nitrite in the oxidation of d<span class="hlt">Fe</span>(II) to p<span class="hlt">Fe</span>(III). Lastly, we present a conceptual <span class="hlt">model</span> for the rapid redox cycling of <span class="hlt">Fe</span> that occurs in ODZs, despite the absence of oxygen.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/servlets/purl/1436158','SCIGOV-STC'); return false;" href="https://www.osti.gov/servlets/purl/1436158"><span>Accumulation of <span class="hlt">Fe</span> oxyhydroxides in the Peruvian oxygen deficient zone implies non-oxygen dependent <span class="hlt">Fe</span> oxidation</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Heller, Maija I.; Lam, Phoebe J.; Moffett, James W.</p> <p></p> <p>Oxygen minimum zones (OMZs) have been proposed to be an important source of dissolved iron (<span class="hlt">Fe</span>) into the interior ocean. However, previous studies in OMZs have shown a sharp decrease in total dissolved <span class="hlt">Fe</span> (d<span class="hlt">Fe</span>) and/or dissolved <span class="hlt">Fe</span>(II) (d<span class="hlt">Fe</span>(II)) concentrations at the shelf-break, despite constant temperature, salinity and continued lack of oxygen across the shelf-break. The loss of both total d<span class="hlt">Fe</span> and d<span class="hlt">Fe</span>(II) suggests a conversion of the d<span class="hlt">Fe</span> to particulate form, but studies that have coupled the reduction-oxidation (redox) speciation of both dissolved and particulate phases have not previously been done. Here in this work, we have measured themore » redox speciation and concentrations of both dissolved and particulate forms of <span class="hlt">Fe</span> in samples collected during the U.S. GEOTRACES Eastern tropical Pacific Zonal Transect (EPZT) cruise in 2013 (GP16). This complete data set allows us to assess possible mechanisms for loss of d<span class="hlt">Fe</span>. We observed an offshore loss of d<span class="hlt">Fe</span>(II) within the oxygen deficient zone (ODZ), where dissolved oxygen is undetectable, accompanied by an increase in total particulate <span class="hlt">Fe</span> (p<span class="hlt">Fe</span>). Total p<span class="hlt">Fe</span> concentrations were highest in the upper ODZ. X-ray absorption spectroscopy revealed that the p<span class="hlt">Fe</span> maximum was primarily in the <span class="hlt">Fe</span>(III) form as <span class="hlt">Fe</span>(III) oxyhydroxides. The remarkable similarity in the distributions of total particulate iron and nitrite suggests a role for nitrite in the oxidation of d<span class="hlt">Fe</span>(II) to p<span class="hlt">Fe</span>(III). Lastly, we present a conceptual <span class="hlt">model</span> for the rapid redox cycling of <span class="hlt">Fe</span> that occurs in ODZs, despite the absence of oxygen.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017GeCoA.211..174H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017GeCoA.211..174H"><span>Accumulation of <span class="hlt">Fe</span> oxyhydroxides in the Peruvian oxygen deficient zone implies non-oxygen dependent <span class="hlt">Fe</span> oxidation</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Heller, Maija I.; Lam, Phoebe J.; Moffett, James W.; Till, Claire P.; Lee, Jong-Mi; Toner, Brandy M.; Marcus, Matthew A.</p> <p>2017-08-01</p> <p>Oxygen minimum zones (OMZs) have been proposed to be an important source of dissolved iron (<span class="hlt">Fe</span>) into the interior ocean. However, previous studies in OMZs have shown a sharp decrease in total dissolved <span class="hlt">Fe</span> (d<span class="hlt">Fe</span>) and/or dissolved <span class="hlt">Fe</span>(II) (d<span class="hlt">Fe</span>(II)) concentrations at the shelf-break, despite constant temperature, salinity and continued lack of oxygen across the shelf-break. The loss of both total d<span class="hlt">Fe</span> and d<span class="hlt">Fe</span>(II) suggests a conversion of the d<span class="hlt">Fe</span> to particulate form, but studies that have coupled the reduction-oxidation (redox) speciation of both dissolved and particulate phases have not previously been done. Here we have measured the redox speciation and concentrations of both dissolved and particulate forms of <span class="hlt">Fe</span> in samples collected during the U.S. GEOTRACES Eastern tropical Pacific Zonal Transect (EPZT) cruise in 2013 (GP16). This complete data set allows us to assess possible mechanisms for loss of d<span class="hlt">Fe</span>. We observed an offshore loss of d<span class="hlt">Fe</span>(II) within the oxygen deficient zone (ODZ), where dissolved oxygen is undetectable, accompanied by an increase in total particulate <span class="hlt">Fe</span> (p<span class="hlt">Fe</span>). Total p<span class="hlt">Fe</span> concentrations were highest in the upper ODZ. X-ray absorption spectroscopy revealed that the p<span class="hlt">Fe</span> maximum was primarily in the <span class="hlt">Fe</span>(III) form as <span class="hlt">Fe</span>(III) oxyhydroxides. The remarkable similarity in the distributions of total particulate iron and nitrite suggests a role for nitrite in the oxidation of d<span class="hlt">Fe</span>(II) to p<span class="hlt">Fe</span>(III). We present a conceptual <span class="hlt">model</span> for the rapid redox cycling of <span class="hlt">Fe</span> that occurs in ODZs, despite the absence of oxygen.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/23497875','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/23497875"><span>Mild <span class="hlt">Fe</span>-deficiency improves biomass production and quality of hydroponic-cultivated spinach plants (Spinacia oleracea L.).</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Jin, Chong-Wei; Liu, Yue; Mao, Qian-Qian; Wang, Qian; Du, Shao-Ting</p> <p>2013-06-15</p> <p>It is of great practical importance to improve yield and quality of vegetables in soilless cultures. This study investigated the effects of iron-nutrition management on yield and quality of hydroponic-cultivated spinach (Spinacia oleracea L.). The results showed that mild <span class="hlt">Fe</span>-deficient treatment (1 μM <span class="hlt">Fe</span>EDTA) yielded a greater biomass of edible <span class="hlt">parts</span> than <span class="hlt">Fe</span>-omitted treatment (0 μM <span class="hlt">Fe</span>EDTA) or <span class="hlt">Fe</span>-sufficient treatments (10 and 50 μM <span class="hlt">Fe</span>EDTA). Conversely, mild <span class="hlt">Fe</span>-deficient treatment had the lowest nitrate concentration in the edible <span class="hlt">parts</span> out of all the <span class="hlt">Fe</span> treatments. Interestingly, all the concentrations of soluble sugar, soluble protein and ascorbate in mild <span class="hlt">Fe</span>-deficient treatments were higher than <span class="hlt">Fe</span>-sufficient treatments. In addition, both phenolic concentration and DPPH scavenging activity in mild <span class="hlt">Fe</span>-deficient treatments were comparable with those in <span class="hlt">Fe</span>-sufficient treatments, but were higher than those in <span class="hlt">Fe</span>-omitted treatments. Therefore, we concluded that using a mild <span class="hlt">Fe</span>-deficient nutrition solution to cultivate spinach not only would increase yield, but also would improve quality. Copyright © 2012 Elsevier Ltd. All rights reserved.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/servlets/purl/1237412','SCIGOV-STC'); return false;" href="https://www.osti.gov/servlets/purl/1237412"><span>A defect density-based constitutive crystal plasticity framework for <span class="hlt">modeling</span> the plastic deformation of <span class="hlt">Fe</span>-Cr-Al cladding alloys subsequent to irradiation</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Patra, Anirban; Wen, Wei; Martinez Saez, Enrique</p> <p>2016-02-05</p> <p>It is essential to understand the deformation behavior of these <span class="hlt">Fe</span>-Cr-Al alloys, in order to be able to develop <span class="hlt">models</span> for predicting their mechanical response under varied loading conditions. Interaction of dislocations with the radiation-induced defects governs the crystallographic deformation mechanisms. A crystal plasticity framework is employed to <span class="hlt">model</span> these mechanisms in <span class="hlt">Fe</span>-Cr-Al alloys. This work builds on a previously developed defect density-based crystal plasticity <span class="hlt">model</span> for bcc metals and alloys, with necessary modifications made to account for the defect substructure observed in <span class="hlt">Fe</span>-Cr-Al alloys. The <span class="hlt">model</span> is implemented in a Visco-Plastic Self Consistent (VPSC) framework, to predict the mechanicalmore » behavior under quasi-static loading.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013AIPC.1511..651B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013AIPC.1511..651B"><span>Storage strategies of eddy-current <span class="hlt">FE</span>-BI <span class="hlt">model</span> for GPU implementation</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Bardel, Charles; Lei, Naiguang; Udpa, Lalita</p> <p>2013-01-01</p> <p>In the past few years graphical processing units (GPUs) have shown tremendous improvements in computational throughput over standard CPU architecture. However, this comes at the cost of restructuring the algorithms to meet the strengths and drawbacks of this GPU architecture. A major drawback is the state of limited memory, and hence storage of <span class="hlt">FE</span> stiffness matrices on the GPU is important. In contrast to storage on CPU the GPU storage format has significant influence on the overall performance. This paper presents an investigation of a storage strategy in the implementation of a two-dimensional finite element-boundary integral (<span class="hlt">FE</span>-BI) <span class="hlt">model</span> for Eddy current NDE applications, on GPU architecture. Specifically, the high dimensional matrices are manipulated by examining the matrix structure and optimally splitting into structurally independent component matrices for efficient storage and retrieval of each component. Results obtained using the proposed approach are compared to those of conventional CPU implementation for validating the method.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/27078566','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/27078566"><span>The locations of recent supernovae near the Sun from <span class="hlt">modelling</span> (60)<span class="hlt">Fe</span> transport.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Breitschwerdt, D; Feige, J; Schulreich, M M; de Avillez, M A; Dettbarn, C; Fuchs, B</p> <p>2016-04-07</p> <p>The signature of (60)<span class="hlt">Fe</span> in deep-sea crusts indicates that one or more supernovae exploded in the solar neighbourhood about 2.2 million years ago. Recent isotopic analysis is consistent with a core-collapse or electron-capture supernova that occurred 60 to 130 parsecs from the Sun. Moreover, peculiarities in the cosmic ray spectrum point to a nearby supernova about two million years ago. The Local Bubble of hot, diffuse plasma, in which the Solar System is embedded, originated from 14 to 20 supernovae within a moving group, whose surviving members are now in the Scorpius-Centaurus stellar association. Here we report calculations of the most probable trajectories and masses of the supernova progenitors, and hence their explosion times and sites. The (60)<span class="hlt">Fe</span> signal arises from two supernovae at distances between 90 and 100 parsecs. The closest occurred 2.3 million years ago at present-day galactic coordinates l = 327°, b = 11°, and the second-closest exploded about 1.5 million years ago at l = 343°, b = 25°, with masses of 9.2 and 8.8 times the solar mass, respectively. The remaining supernovae, which formed the Local Bubble, contribute to a smaller extent because they happened at larger distances and longer ago ((60)<span class="hlt">Fe</span> has a half-life of 2.6 million years). There are uncertainties relating to the nucleosynthesis yields and the loss of (60)<span class="hlt">Fe</span> during transport, but they do not influence the relative distribution of (60)<span class="hlt">Fe</span> in the crust layers, and therefore our <span class="hlt">model</span> reproduces the measured relative abundances very well.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/22412861-study-perpendicular-anisotropy-l1-sub-fept-pseudo-spin-valves-using-micromagnetic-trilayer-model','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/22412861-study-perpendicular-anisotropy-l1-sub-fept-pseudo-spin-valves-using-micromagnetic-trilayer-model"><span>Study of perpendicular anisotropy L1{sub 0}-<span class="hlt">Fe</span>Pt pseudo spin valves using a micromagnetic trilayer <span class="hlt">model</span></span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Ho, Pin, E-mail: hopin@mit.edu; Data Storage Institute, Agency of Science, Technology and Research - A*STAR, 117608 Singapore; Evans, Richard F. L.</p> <p>2015-06-07</p> <p>A trilayer micromagnetic <span class="hlt">model</span> based on the Landau-Lifshitz-Bloch equation of motion is utilized to study the properties of L1{sub 0}-<span class="hlt">Fe</span>Pt/TiN/L1{sub 0}-<span class="hlt">Fe</span>Pt pseudo spin valves (PSVs) in direct comparison with experiment. Theoretical studies give an insight on the crystallographic texture, magnetic properties, reversal behavior, interlayer coupling effects, and magneto-transport properties of the PSVs, in particular, with varying thickness of the top L1{sub 0}-<span class="hlt">Fe</span>Pt and TiN spacer. We show that morphological changes in the <span class="hlt">Fe</span>Pt layers, induced by varying the <span class="hlt">Fe</span>Pt layer thickness, lead to different hysteresis behaviors of the samples, caused by changes in the interlayer and intralayer exchange couplings. Suchmore » effects are important for the optimization of the PSVs due to the relationship between the magnetic properties, domain structures, and the magnetoresistance of the device.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/servlets/purl/1339249','SCIGOV-STC'); return false;" href="https://www.osti.gov/servlets/purl/1339249"><span>Development of a Rhodobacter capsulatus self-reporting <span class="hlt">model</span> system for optimizing light-dependent, [<span class="hlt">FeFe</span>]-hydrogenase-driven H 2 production</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Wecker, Matt S. A.; Beaton, Stephen E.; Chado, Robert A.</p> <p></p> <p>The photosynthetic bacterium Rhodobacter capsulatus normally photoproduces H 2 as a by-product of its nitrogenase-catalyzed nitrogen-fixing activity. Such H 2 production, however, is expensive from a metabolic perspective, requiring nearly four times as many photons as the equivalent algal hydrogenase-based system. Here we report the insertion of a Clostridium acetobutylicum [<span class="hlt">FeFe</span>]-hydrogenase and its three attendant hydrogenase assembly proteins into an R. capsulatus strain lacking its native uptake hydrogenase. Further, this strain is modified to fluoresce upon sensing H 2. The resulting strain photoproduces H 2 and self-reports its own H 2 production through fluorescence. Furthermore, this <span class="hlt">model</span> system represents amore » unique method of developing hydrogenase-based H 2 production in R. capsulatus, may serve as a powerful system for in vivo directed evolution of hydrogenases and hydrogenase-associated genes, and provides a means of screening for increased metabolic production of H 2.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1339249-development-rhodobacter-capsulatus-self-reporting-model-system-optimizing-light-dependent-fefe-hydrogenase-driven-h2-production','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1339249-development-rhodobacter-capsulatus-self-reporting-model-system-optimizing-light-dependent-fefe-hydrogenase-driven-h2-production"><span>Development of a Rhodobacter capsulatus self-reporting <span class="hlt">model</span> system for optimizing light-dependent, [<span class="hlt">FeFe</span>]-hydrogenase-driven H 2 production</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Wecker, Matt S. A.; Beaton, Stephen E.; Chado, Robert A.; ...</p> <p>2016-08-17</p> <p>The photosynthetic bacterium Rhodobacter capsulatus normally photoproduces H 2 as a by-product of its nitrogenase-catalyzed nitrogen-fixing activity. Such H 2 production, however, is expensive from a metabolic perspective, requiring nearly four times as many photons as the equivalent algal hydrogenase-based system. Here we report the insertion of a Clostridium acetobutylicum [<span class="hlt">FeFe</span>]-hydrogenase and its three attendant hydrogenase assembly proteins into an R. capsulatus strain lacking its native uptake hydrogenase. Further, this strain is modified to fluoresce upon sensing H 2. The resulting strain photoproduces H 2 and self-reports its own H 2 production through fluorescence. Furthermore, this <span class="hlt">model</span> system represents amore » unique method of developing hydrogenase-based H 2 production in R. capsulatus, may serve as a powerful system for in vivo directed evolution of hydrogenases and hydrogenase-associated genes, and provides a means of screening for increased metabolic production of H 2.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://pubs.usgs.gov/sir/2011/5025/','USGSPUBS'); return false;" href="https://pubs.usgs.gov/sir/2011/5025/"><span>Three-dimensional geologic <span class="hlt">model</span> of the southeastern Espanola Basin, Santa <span class="hlt">Fe</span> County, New Mexico</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Pantea, Michael P.; Hudson, Mark R.; Grauch, V.J.S.; Minor, Scott A.</p> <p>2011-01-01</p> <p>This multimedia <span class="hlt">model</span> and report show and describe digital three-dimensional faulted surfaces and volumes of lithologic units that confine and constrain the basin-fill aquifers within the Espanola Basin of north-central New Mexico. These aquifers are the primary groundwater resource for the cities of Santa <span class="hlt">Fe</span> and Espanola, six Pueblo nations, and the surrounding areas. The <span class="hlt">model</span> presented in this report is a synthesis of geologic information that includes (1) aeromagnetic and gravity data and seismic cross sections; (2) lithologic descriptions, interpretations, and geophysical logs from selected drill holes; (3) geologic maps, geologic cross sections, and interpretations; and (4) mapped faults and interpreted faults from geophysical data. <span class="hlt">Modeled</span> faults individually or collectively affect the continuity of the rocks that contain the basin aquifers; they also help define the form of this rift basin. Structure, trend, and dip data not previously published were added; these structures are derived from interpretations of geophysical information and recent field observations. Where possible, data were compared and validated and reflect the complex relations of structures in this <span class="hlt">part</span> of the Rio Grande rift. This interactive geologic framework <span class="hlt">model</span> can be used as a tool to visually explore and study geologic structures within the Espanola Basin, to show the connectivity of geologic units of high and low permeability between and across faults, and to show approximate dips of the lithologic units. The viewing software can be used to display other data and information, such as drill-hole data, within this geologic framework <span class="hlt">model</span> in three-dimensional space.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://pubs.er.usgs.gov/publication/70018272','USGSPUBS'); return false;" href="https://pubs.er.usgs.gov/publication/70018272"><span>Alternative solution <span class="hlt">model</span> for the ternary carbonate system CaCO3 - MgCO3 - <span class="hlt">Fe</span>CO3 - II. Calibration of a combined ordering <span class="hlt">model</span> and mixing <span class="hlt">model</span></span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>McSwiggen, P.L.</p> <p>1993-01-01</p> <p>Earlier attempts at solution <span class="hlt">models</span> for the ternary carbonate system have been unable to adequately accommodate the cation ordering which occurs in some of the carbonate phases. The carbonate solution <span class="hlt">model</span> of this study combines a Margules type of interaction <span class="hlt">model</span> with a Bragg-Williams type of ordering <span class="hlt">model</span>. The ordering <span class="hlt">model</span> determines the equilibrium state of order for a crystal, from which the cation distribution within the lattice can be obtained. The interaction <span class="hlt">model</span> addresses the effect that mixing different cation species within a given cation layer has on the total free energy of the system. An ordering <span class="hlt">model</span> was derived, based on the Bragg-Williams approach; it is applicable to ternary systems involving three cations substituting on two sites, and contains three ordering energy parameters (WCaMg, WCa<span class="hlt">Fe</span>, and WCaMg<span class="hlt">Fe</span>). The solution <span class="hlt">model</span> of this study involves six Margules-type interaction parameters (W12, W21, W13, W31, W23, and W32). Values for the two sets of energy parameters were calculated from experimental data and from compositional relationships in natural assemblages. ?? 1993 Springer-Verlag.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/1597476','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/1597476"><span>Sealed reticulocyte ghosts. An experimental <span class="hlt">model</span> for the study of <span class="hlt">Fe</span>2+ transport.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Núñez, M T; Escobar, A; Ahumada, A; Gonzalez-Sepulveda, M</p> <p>1992-06-05</p> <p>Sealed right-side-out reticulocyte ghosts transported and accumulated iron offered as 59<span class="hlt">Fe</span>(2+)-ascorbate (Km = 1.1 microM). The uptake of iron by ghosts presented the characteristics of a transporter-mediated process: it responded to osmotic challenge, the rate of transport increased when iron was present in the opposing side, and the transport rate showed the temperature dependence typical of membrane-mediated processes. The transport of iron was dependent on an associated influx of Cl- in order to keep electroneutrality. Other transition metals, such as Cu2+, Zn2+, and Co2+, inhibited the transport of <span class="hlt">Fe</span>2+. The overall characteristics of the system make reticulocyte sealed ghosts a very useful <span class="hlt">model</span> in determining the basic mechanisms of membrane iron transport.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1440310-co-bridged-cluster-intermediates-catalytic-mechanism-fefe-hydrogenase-cai','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1440310-co-bridged-cluster-intermediates-catalytic-mechanism-fefe-hydrogenase-cai"><span>CO-Bridged H-Cluster Intermediates in the Catalytic Mechanism of [<span class="hlt">FeFe</span>]-Hydrogenase CaI</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Ratzloff, Michael W.; Artz, Jacob H.; Mulder, David W.; ...</p> <p>2018-05-23</p> <p>The [<span class="hlt">FeFe</span>]-hydrogenases ([<span class="hlt">FeFe</span>] H 2ases) catalyze reversible H 2 activation at the H-cluster, which is composed of a [4<span class="hlt">Fe</span>-4S] H subsite linked by a cysteine thiolate to a bridged, organometallic [2<span class="hlt">Fe</span>-2S] ([2<span class="hlt">Fe</span>] H) subsite. Profoundly different geometric <span class="hlt">models</span> of the H-cluster redox states that orchestrate the electron/proton transfer steps of H 2 bond activation have been proposed. We have examined this question in the [<span class="hlt">FeFe</span>] H 2ase I from Clostridium acetobutylicum (CaI) by Fourier-transform infrared (FTIR) spectroscopy with temperature annealing and H/D isotope exchange to identify the relevant redox states and define catalytic transitions. One-electron reduction of H ox ledmore » to formation of H redH + ([4<span class="hlt">Fe</span>-4S] H 2+-<span class="hlt">Fe</span> I-<span class="hlt">Fe</span> I) and H red' ([4<span class="hlt">Fe</span>-4S] H 1+-<span class="hlt">Fe</span> II-<span class="hlt">Fe</span> I), with both states characterized by low frequency μ-CO IR modes consistent with a fully bridged [2<span class="hlt">Fe</span>] H. Similar μ-CO IR modes were also identified for H redH + of the [<span class="hlt">FeFe</span>] H 2ase from Chlamydomonas reinhardtii (CrHydA1). The CaI proton-transfer variant C298S showed enrichment of an H/D isotope-sensitive μ-CO mode, a component of the hydride bound H-cluster IR signal, H hyd. Equilibrating CaI with increasing amounts of NaDT, and probed at cryogenic temperatures, showed H redH + was converted to H hyd. Over an increasing temperature range from 10 to 260 K catalytic turnover led to loss of Hhyd and appearance of H ox, consistent with enzymatic turnover and H 2 formation. The results show for CaI that the μ-CO of [2<span class="hlt">Fe</span>] H remains bridging for all of the 'H red' states and that H redH + is on pathway to H hyd and H 2 evolution in the catalytic mechanism. Here, this provides a blueprint for designing small molecule catalytic analogs« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/1440310-co-bridged-cluster-intermediates-catalytic-mechanism-fefe-hydrogenase-cai','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/1440310-co-bridged-cluster-intermediates-catalytic-mechanism-fefe-hydrogenase-cai"><span>CO-Bridged H-Cluster Intermediates in the Catalytic Mechanism of [<span class="hlt">FeFe</span>]-Hydrogenase CaI</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Ratzloff, Michael W.; Artz, Jacob H.; Mulder, David W.</p> <p></p> <p>The [<span class="hlt">FeFe</span>]-hydrogenases ([<span class="hlt">FeFe</span>] H 2ases) catalyze reversible H 2 activation at the H-cluster, which is composed of a [4<span class="hlt">Fe</span>-4S] H subsite linked by a cysteine thiolate to a bridged, organometallic [2<span class="hlt">Fe</span>-2S] ([2<span class="hlt">Fe</span>] H) subsite. Profoundly different geometric <span class="hlt">models</span> of the H-cluster redox states that orchestrate the electron/proton transfer steps of H 2 bond activation have been proposed. We have examined this question in the [<span class="hlt">FeFe</span>] H 2ase I from Clostridium acetobutylicum (CaI) by Fourier-transform infrared (FTIR) spectroscopy with temperature annealing and H/D isotope exchange to identify the relevant redox states and define catalytic transitions. One-electron reduction of H ox ledmore » to formation of H redH + ([4<span class="hlt">Fe</span>-4S] H 2+-<span class="hlt">Fe</span> I-<span class="hlt">Fe</span> I) and H red' ([4<span class="hlt">Fe</span>-4S] H 1+-<span class="hlt">Fe</span> II-<span class="hlt">Fe</span> I), with both states characterized by low frequency μ-CO IR modes consistent with a fully bridged [2<span class="hlt">Fe</span>] H. Similar μ-CO IR modes were also identified for H redH + of the [<span class="hlt">FeFe</span>] H 2ase from Chlamydomonas reinhardtii (CrHydA1). The CaI proton-transfer variant C298S showed enrichment of an H/D isotope-sensitive μ-CO mode, a component of the hydride bound H-cluster IR signal, H hyd. Equilibrating CaI with increasing amounts of NaDT, and probed at cryogenic temperatures, showed H redH + was converted to H hyd. Over an increasing temperature range from 10 to 260 K catalytic turnover led to loss of Hhyd and appearance of H ox, consistent with enzymatic turnover and H 2 formation. The results show for CaI that the μ-CO of [2<span class="hlt">Fe</span>] H remains bridging for all of the 'H red' states and that H redH + is on pathway to H hyd and H 2 evolution in the catalytic mechanism. Here, this provides a blueprint for designing small molecule catalytic analogs« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/29792026','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/29792026"><span>CO-Bridged H-Cluster Intermediates in the Catalytic Mechanism of [<span class="hlt">FeFe</span>]-Hydrogenase CaI.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Ratzloff, Michael W; Artz, Jacob H; Mulder, David W; Collins, Reuben T; Furtak, Thomas E; King, Paul W</p> <p>2018-06-20</p> <p>The [<span class="hlt">FeFe</span>]-hydrogenases ([<span class="hlt">FeFe</span>] H 2 ases) catalyze reversible H 2 activation at the H-cluster, which is composed of a [4<span class="hlt">Fe</span>-4S] H subsite linked by a cysteine thiolate to a bridged, organometallic [2<span class="hlt">Fe</span>-2S] ([2<span class="hlt">Fe</span>] H ) subsite. Profoundly different geometric <span class="hlt">models</span> of the H-cluster redox states that orchestrate the electron/proton transfer steps of H 2 bond activation have been proposed. We have examined this question in the [<span class="hlt">FeFe</span>] H 2 ase I from Clostridium acetobutylicum (CaI) by Fourier-transform infrared (FTIR) spectroscopy with temperature annealing and H/D isotope exchange to identify the relevant redox states and define catalytic transitions. One-electron reduction of H ox led to formation of H red H + ([4<span class="hlt">Fe</span>-4S] H 2+ -<span class="hlt">Fe</span> I -<span class="hlt">Fe</span> I ) and H red ' ([4<span class="hlt">Fe</span>-4S] H 1+ -<span class="hlt">Fe</span> II -<span class="hlt">Fe</span> I ), with both states characterized by low frequency μ-CO IR modes consistent with a fully bridged [2<span class="hlt">Fe</span>] H . Similar μ-CO IR modes were also identified for H red H + of the [<span class="hlt">FeFe</span>] H 2 ase from Chlamydomonas reinhardtii (CrHydA1). The CaI proton-transfer variant C298S showed enrichment of an H/D isotope-sensitive μ-CO mode, a component of the hydride bound H-cluster IR signal, H hyd . Equilibrating CaI with increasing amounts of NaDT, and probed at cryogenic temperatures, showed H red H + was converted to H hyd . Over an increasing temperature range from 10 to 260 K catalytic turnover led to loss of H hyd and appearance of H ox , consistent with enzymatic turnover and H 2 formation. The results show for CaI that the μ-CO of [2<span class="hlt">Fe</span>] H remains bridging for all of the "H red " states and that H red H + is on pathway to H hyd and H 2 evolution in the catalytic mechanism. These results provide a blueprint for designing small molecule catalytic analogs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1239159-mechanically-induced-disorder-cafe2as2-mossbauer-study','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1239159-mechanically-induced-disorder-cafe2as2-mossbauer-study"><span>Mechanically-induced disorder in Ca<span class="hlt">Fe</span> 2As 2: A 57<span class="hlt">Fe</span> Mössbauer study</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Ma, Xiaoming; Ran, Sheng; Canfield, Paul C.; ...</p> <p>2015-10-17</p> <p>57<span class="hlt">Fe</span> Mössbauer spectroscopy was used to perform a microscopic study on the extremely pressure and strain sensitive compound, Ca<span class="hlt">Fe</span> 2As 2, with different degrees of strain introduced by grinding and annealing. At the base temperature, in the antiferromagnetic/orthorhombic phase, compared to a sharp sextet Mössbauer spectrum of single crystal Ca<span class="hlt">Fe</span> 2As 2, which is taken as an un-strained sample, an obviously broadened sextet and an extra doublet were observed for ground Ca<span class="hlt">Fe</span> 2As 2 powders with different degrees of strain. The Mössbauer results suggest that the magnetic phase transition of Ca<span class="hlt">Fe</span> 2As 2 can be inhomogeneously suppressed by the grindingmore » induced strain to such an extent that the antiferromagnetic order in <span class="hlt">parts</span> of the grains forming the powdered sample remain absent all the way down to 4.6 K. However, strain has almost no effect on the temperature dependent hyperfine magnetic field in the grains with magnetic order. Additional electronic and asymmetry information was obtained from the isomer shift and quadrupole splitting. Similar isomer shift values in the magnetic phase for samples with different degrees of strain, indicate that the stain does not bring any significant variation of the electronic density at 57<span class="hlt">Fe</span> nucleus position. As a result, the absolute values of quadrupole shift in the magnetic phase decrease and approach zero with increasing degrees of strain, indicating that the strain reduces the average lattice asymmetry at <span class="hlt">Fe</span> atom position.« less</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_7");'>7</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li class="active"><span>9</span></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_9 --> <div id="page_10" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li class="active"><span>10</span></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="181"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5590716','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5590716"><span>Two-<span class="hlt">Part</span> and Related Regression <span class="hlt">Models</span> for Longitudinal Data</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Farewell, V.T.; Long, D.L.; Tom, B.D.M.; Yiu, S.; Su, L.</p> <p>2017-01-01</p> <p>Statistical <span class="hlt">models</span> that involve a two-<span class="hlt">part</span> mixture distribution are applicable in a variety of situations. Frequently, the two <span class="hlt">parts</span> are a <span class="hlt">model</span> for the binary response variable and a <span class="hlt">model</span> for the outcome variable that is conditioned on the binary response. Two common examples are zero-inflated or hurdle <span class="hlt">models</span> for count data and two-<span class="hlt">part</span> <span class="hlt">models</span> for semicontinuous data. Recently, there has been particular interest in the use of these <span class="hlt">models</span> for the analysis of repeated measures of an outcome variable over time. The aim of this review is to consider motivations for the use of such <span class="hlt">models</span> in this context and to highlight the central issues that arise with their use. We examine two-<span class="hlt">part</span> <span class="hlt">models</span> for semicontinuous and zero-heavy count data, and we also consider <span class="hlt">models</span> for count data with a two-<span class="hlt">part</span> random effects distribution. PMID:28890906</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/22584088-heat-capacity-magnetic-properties-fluoride-csfe-sup-fe-sup-sub-defect-pyrochlore-structure','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/22584088-heat-capacity-magnetic-properties-fluoride-csfe-sup-fe-sup-sub-defect-pyrochlore-structure"><span>Heat capacity and magnetic properties of fluoride Cs<span class="hlt">Fe</span>{sup 2+}<span class="hlt">Fe</span>{sup 3+}F{sub 6} with defect pyrochlore structure</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Gorev, M.V., E-mail: gorev@iph.krasn.ru; Institute of Engineering Physics and Radio Electronics, Siberian State University, 660074 Krasnoyarsk; Flerov, I.N.</p> <p>2016-05-15</p> <p>Heat capacity, Mössbauer and Raman spectra as well as magnetic properties of fluoride Cs<span class="hlt">Fe</span>{sub 2}F{sub 6} with defect pyrochlore structure were studied. In addition to recently found above room temperature three successive structural transformations Pnma-Imma-I4{sub 1}amd-Fd-3m, phase transition of antiferromagnetic nature with the 13.7 K Neel temperature and a broad heat capacity anomaly with a maximum at about 30 K were observed. The room temperature symmetry Pnma is unchanged at least down to 7 K. Simple <span class="hlt">model</span> of indirect bond used to estimate the exchange interactions and to propose a magnetic structure <span class="hlt">model</span>. - Graphical abstract: The ordered arrangement ofmore » <span class="hlt">Fe</span>{sup 2+} and <span class="hlt">Fe</span>{sup 3+} ions in high-spin states as well as antiferromagnetic phase transition followed by significant magnetic frustrations were found in pyrocholore-related Cs<span class="hlt">Fe</span>{sup 2+}<span class="hlt">Fe</span>{sup 3+}F{sub 6}. A magnetic structure was proposed using a simple <span class="hlt">model</span> of indirect bonds. - Highlights: • The Pnma structure in pyrocholore Cs<span class="hlt">Fe</span>{sub 2}F{sub 6} is stable down to helium temperature. • Mössbauer spectra confirmed the ordering of <span class="hlt">Fe</span>{sup 2+} and <span class="hlt">Fe</span>{sup 3+} ions. • Antiferromagnetic transformation and significant magnetic frustrations are found. • Experimental magnetic entropy agrees with entropy for <span class="hlt">Fe</span> ions in high-spin state. • Superexchange interactions were calculated and a magnetic structure was proposed.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010JPhD...43o5301P','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010JPhD...43o5301P"><span>The effect of <span class="hlt">Fe</span>F2 on the magneto-optic response in <span class="hlt">Fe</span>F2/<span class="hlt">Fe/Fe</span>F2 sandwiches</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Pištora, J.; Lesňák, M.; Lišková, E.; Višňovský, Š.; Harward, I.; Maslankiewicz, P.; Balin, K.; Celinski, Z.; Mistrík, J.; Yamaguchi, T.; Lopusnik, R.; Vlček, J.</p> <p>2010-04-01</p> <p>The room temperature optical constants n and k of MBE grown <span class="hlt">Fe</span>F2 films are reported. Because of poor chemical stability, <span class="hlt">Fe</span>F2 had to be coated with a protective Au layer. Reflection spectral ellipsometry in the photon energy range between 1.3 and 5.2 eV was performed on structures with a typical profile Au(0.5 nm)/<span class="hlt">Fe</span>F2(120 nm)/Au(30 nm)/Ag(20 nm)/<span class="hlt">Fe</span>(0.6 nm) grown on GaAs(0 0 1) substrate. The spectra of n and k in <span class="hlt">Fe</span>F2 were subsequently employed in the design of <span class="hlt">Fe</span>F2/<span class="hlt">Fe/Fe</span>F2 sandwiches considered as magneto-optic (MO) sensors for weak microwave currents. Their MO response was evaluated using reflection MO (Kerr) spectroscopy at polar magnetization. The present results may be of interest in MO studies of magnetic nanostructures with <span class="hlt">Fe/Fe</span>F2/<span class="hlt">Fe</span>, including MO magnetometry and MO magnetic domain imaging.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/29945043','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/29945043"><span><span class="hlt">Modeling</span> and validation of a detailed <span class="hlt">FE</span> viscoelastic lumbar spine <span class="hlt">model</span> for vehicle occupant dummies.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Amiri, Sorosh; Naserkhaki, Sadegh; Parnianpour, Mohamad</p> <p>2018-06-19</p> <p>The dummies currently used for predicting vehicle occupant response during frontal crashes or whole-body vibration provide insufficient information about spinal loads. Although they aptly approximate upper-body rotations in different loading scenarios, they overlook spinal loads, which are crucial to injury assessment. This paper aims to develop a modified dummy finite element (<span class="hlt">FE</span>) <span class="hlt">model</span> with a detailed viscoelastic lumbar spine. This <span class="hlt">model</span> has been developed and validated against in-vitro and in-silico data under different loading conditions, and its predicted ranges of motion (RoM) and intradiscal pressure (IDP) maintain close correspondence with the in-vitro data. The dominant frequency of the <span class="hlt">model</span> was f = 8.92 Hz, which was close to previous results. In the relaxation test, a force reduction of up to 21% was obtained, showing high agreement in force relaxation during the in-vitro test. The <span class="hlt">FE</span> lumbar spine <span class="hlt">model</span> was placed in the HYBRID III test dummy and aligned in a seated position based on available MRI data. Under two impulsive acceleration loadings in flexion and lateral directions with a peak acceleration of 60 m/s 2 , flexion responses of the modified and original dummies were close (RoMs of 29.1° and 29.6°, respectively), though not in lateral bending (RoMs of 34.1° and 15.6°, respectively), where the modified dummy was more flexible than the original. By reconstructing a real frontal crash, it was found that the modified dummy provided a 10% reduction in the Head Injury Criterion (HIC). Other than the more realistic behavior of this modified dummy, its capability of approximating lumbar loads and risk of lumbar spine injuries in vehicle crashes or whole-body vibration is of great importance. Copyright © 2018 Elsevier Ltd. All rights reserved.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016JMEP...25.1709T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016JMEP...25.1709T"><span><span class="hlt">FE</span> Simulation <span class="hlt">Models</span> for Hot Stamping an Automobile Component with Tailor-Welded High-Strength Steels</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Tang, Bingtao; Wang, Qiaoling; Wei, Zhaohui; Meng, Xianju; Yuan, Zhengjun</p> <p>2016-05-01</p> <p>Ultra-high-strength in sheet metal <span class="hlt">parts</span> can be achieved with hot stamping process. To improve the crash performance and save vehicle weight, it is necessary to produce components with tailored properties. The use of tailor-welded high-strength steel is a relatively new hot stamping process for saving weight and obtaining desired local stiffness and crash performance. The simulation of hot stamping boron steel, especially tailor-welded blanks (TWBs) stamping, is more complex and challenging. Information about thermal/mechanical properties of tools and sheet materials, heat transfer, and friction between the deforming material and the tools is required in detail. In this study, the boron-manganese steel B1500HS and high-strength low-alloy steel B340LA are tailor welded and hot stamped. In order to precisely simulate the hot stamping process, <span class="hlt">modeling</span> and simulation of hot stamping tailor-welded high-strength steels, including phase transformation <span class="hlt">modeling</span>, thermal <span class="hlt">modeling</span>, and thermal-mechanical <span class="hlt">modeling</span>, is investigated. Meanwhile, the welding zone of tailor-welded blanks should be sufficiently accurate to describe thermal, mechanical, and metallurgical parameters. <span class="hlt">FE</span> simulation <span class="hlt">model</span> using TWBs with the thickness combination of 1.6 mm boron steel and 1.2 mm low-alloy steel is established. In order to evaluate the mechanical properties of the hot stamped automotive component (mini b-pillar), hardness and microstructure at each region are investigated. The comparisons between simulated results and experimental observations show the reliability of thermo-mechanical and metallurgical <span class="hlt">modeling</span> strategies of TWBs hot stamping process.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014AGUFMMR31A4318T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014AGUFMMR31A4318T"><span>Compression of <span class="hlt">Fe</span>-Si-H alloys</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Tagawa, S.; Ohta, K.; Hirose, K.</p> <p>2014-12-01</p> <p>The light elements in the Earth's core have not been fully identified yet, but hydrogen is now collecting more attention in <span class="hlt">part</span> because recent planet formation theory suggests that large amount of water should have been brought to the Earth during its formation (giant-impact stage). Nevertheless, the effect of hydrogen on the property of iron alloys is little known so far. The earlier experimental study by Hirao et al. [2004 GRL] examined the compression behavior of dhcp <span class="hlt">Fe</span>Hx (x ≈ 1) and found that it becomes much stiffer than pure iron above 50 GPa, where magnetization disappears. Here we examined the solubility of hydrogen into iron-rich <span class="hlt">Fe</span>-Si alloys and the compression behavior of dhcp <span class="hlt">Fe</span>-Si-H alloy at room temperature. <span class="hlt">Fe</span>+6.5wt.%Si or <span class="hlt">Fe</span>+9wt.%Si foil was loaded into a diamond-anvil cell (DAC), and then liquid hydrogen was introduced at temperatures below 20 K. X-ray diffraction measurements at SPring-8 revealed the formation of a dhcp phase with or without thermal annealing by laser above 8.4 GPa. The concentration of hydrogen in such dhcp lattice was calculated following the formula reported by Fukai [1992]; y = 0.5 and 0.2 for <span class="hlt">Fe</span>-6.5wt.%Si-H or <span class="hlt">Fe</span>-9wt.%Si-H alloys, respectively when y is defined as <span class="hlt">Fe</span>(1-x)SixHy. Unlike <span class="hlt">Fe</span>-H alloy, hydrogen didn't fully occupy the octahedral sites even under hydrogen-saturated conditions in the case of <span class="hlt">Fe</span>-Si-H system. Anomaly was observed in obtained pressure-volume curve around 44 Å3 of unit-cell volume for both <span class="hlt">Fe</span>-6.5wt.%Si-H and <span class="hlt">Fe</span>-9wt.%Si-H alloys, which may be related to the spin transition in the dhcp phase. They became slightly stiffer at higher pressures, but their compressibility was still similar to that of pure iron.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017MS%26E..213a2019Y','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017MS%26E..213a2019Y"><span>Surface analysis of <span class="hlt">Fe</span>-Co-Mo electrolytic coatings</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Yar-Mukhamedova, G. Sh; Sakhnenko, N. D.; Ved', M. V.; Yermolenko, I. Yu; Zyubanova, S. I.</p> <p>2017-06-01</p> <p>Coatings <span class="hlt">Fe</span>-Co-Mo with a composition of 47 at.% iron, 28 at.% Cobalt and 25 at.% Molybdenum were deposited from citrate electrolyte using pulse electrolysis mode. Scanning electron and atomic force microscopy have established the surface morphology and topography. It was identified the <span class="hlt">parts</span> with a globular structure which have an average size of 0.2-0.5μm and singly located sharp grains. Within the same scan area sites with developed surface were detected the topography of which is identical to the crystal structure of cobalt with the crystallites size of 0.2-1.75μm. The parameters Ra and Rq for <span class="hlt">parts</span> with different morphology as well as average characteristics of coatings demonstrated the low roughness of the surface. It is found that the coercive force of <span class="hlt">Fe</span>-Co-Mo films is 7-10 Oe, which allow us to classify the <span class="hlt">Fe</span>-Co-Mo coatings as soft magnetic materials.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016JMMM..419..517G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016JMMM..419..517G"><span>Coercivity scaling in antidot lattices in <span class="hlt">Fe</span>, Ni, and Ni<span class="hlt">Fe</span> thin films</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Gräfe, Joachim; Schütz, Gisela; Goering, Eberhard J.</p> <p>2016-12-01</p> <p>Antidot lattices can be used to artificially engineer magnetic properties in thin films, however, a conclusive <span class="hlt">model</span> that describes the coercivity enhancement in this class of magnetic nano-structures has so far not been found. We prepared <span class="hlt">Fe</span>, Ni, and Ni<span class="hlt">Fe</span> thin films and patterned each with 21 square antidot lattices with different geometric parameters and measured their hysteretic behavior. On the basis of this extensive dataset we are able to provide a <span class="hlt">model</span> that can describe both the coercivity scaling over a wide range of geometric lattice parameters and the influence of different materials.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/28882201','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/28882201"><span>B. subtilis as a <span class="hlt">Model</span> for Studying the Assembly of <span class="hlt">Fe</span>-S Clusters in Gram-Positive Bacteria.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Dos Santos, Patricia C</p> <p>2017-01-01</p> <p>Complexes of iron and sulfur (<span class="hlt">Fe</span>-S clusters) are widely distributed in nature and participate in essential biochemical reactions. The biological formation of <span class="hlt">Fe</span>-S clusters involves dedicated pathways responsible for the mobilization of sulfur, the assembly of <span class="hlt">Fe</span>-S clusters, and the transfer of these clusters to target proteins. Genomic analysis of Bacillus subtilis and other Gram-positive bacteria indicated the presence of only one <span class="hlt">Fe</span>-S cluster biosynthesis pathway, which is distinct in number of components and organization from previously studied systems. B. subtilis has been used as a <span class="hlt">model</span> system for the characterization of cysteine desulfurases responsible for sulfur mobilization reactions in the biogenesis of <span class="hlt">Fe</span>-S clusters and other sulfur-containing cofactors. Cysteine desulfurases catalyze the cleavage of the C-S bond from the amino acid cysteine and subsequent transfer of sulfur to acceptor molecules. These reactions can be monitored by the rate of alanine formation, the first product in the reaction, and sulfide formation, a byproduct of reactions performed under reducing conditions. The assembly of <span class="hlt">Fe</span>-S clusters on protein scaffolds and the transfer of these clusters to target acceptors are determined through a combination of spectroscopic methods probing the rate of cluster assembly and transfer. This chapter provides a description of reactions promoting the assembly of <span class="hlt">Fe</span>-S clusters in bacteria as well as methods used to study functions of each biosynthetic component and identify mechanistic differences employed by these enzymes across different pathways. © 2017 Elsevier Inc. All rights reserved.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2014-title46-vol5/pdf/CFR-2014-title46-vol5-part150-appIV.pdf','CFR2014'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2014-title46-vol5/pdf/CFR-2014-title46-vol5-part150-appIV.pdf"><span>46 CFR Appendix IV to <span class="hlt">Part</span> 150 - Data Sheet</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>... 46 Shipping 5 2014-10-01 2014-10-01 false Data Sheet IV Appendix IV to <span class="hlt">Part</span> 150 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) CERTAIN BULK DANGEROUS CARGOES COMPATIBILITY OF CARGOES Pt. 150, App. IV Appendix IV to <span class="hlt">Part</span> 150—Data Sheet EC02<span class="hlt">FE</span>91.080 EC02<span class="hlt">FE</span>91.081 ...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2013-title46-vol5/pdf/CFR-2013-title46-vol5-part150-appIV.pdf','CFR2013'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2013-title46-vol5/pdf/CFR-2013-title46-vol5-part150-appIV.pdf"><span>46 CFR Appendix IV to <span class="hlt">Part</span> 150 - Data Sheet</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>... 46 Shipping 5 2013-10-01 2013-10-01 false Data Sheet IV Appendix IV to <span class="hlt">Part</span> 150 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) CERTAIN BULK DANGEROUS CARGOES COMPATIBILITY OF CARGOES Pt. 150, App. IV Appendix IV to <span class="hlt">Part</span> 150—Data Sheet EC02<span class="hlt">FE</span>91.080 EC02<span class="hlt">FE</span>91.081 ...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2012-title46-vol5/pdf/CFR-2012-title46-vol5-part150-appIV.pdf','CFR2012'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2012-title46-vol5/pdf/CFR-2012-title46-vol5-part150-appIV.pdf"><span>46 CFR Appendix IV to <span class="hlt">Part</span> 150 - Data Sheet</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>... 46 Shipping 5 2012-10-01 2012-10-01 false Data Sheet IV Appendix IV to <span class="hlt">Part</span> 150 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) CERTAIN BULK DANGEROUS CARGOES COMPATIBILITY OF CARGOES Pt. 150, App. IV Appendix IV to <span class="hlt">Part</span> 150—Data Sheet EC02<span class="hlt">FE</span>91.080 EC02<span class="hlt">FE</span>91.081 ...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2011-title46-vol5/pdf/CFR-2011-title46-vol5-part150-appIV.pdf','CFR2011'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2011-title46-vol5/pdf/CFR-2011-title46-vol5-part150-appIV.pdf"><span>46 CFR Appendix IV to <span class="hlt">Part</span> 150 - Data Sheet</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-10-01</p> <p>... 46 Shipping 5 2011-10-01 2011-10-01 false Data Sheet IV Appendix IV to <span class="hlt">Part</span> 150 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) CERTAIN BULK DANGEROUS CARGOES COMPATIBILITY OF CARGOES Pt. 150, App. IV Appendix IV to <span class="hlt">Part</span> 150—Data Sheet EC02<span class="hlt">FE</span>91.080 EC02<span class="hlt">FE</span>91.081 ...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title46-vol5/pdf/CFR-2010-title46-vol5-part150-appIV.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title46-vol5/pdf/CFR-2010-title46-vol5-part150-appIV.pdf"><span>46 CFR Appendix IV to <span class="hlt">Part</span> 150 - Data Sheet</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-10-01</p> <p>... 46 Shipping 5 2010-10-01 2010-10-01 false Data Sheet IV Appendix IV to <span class="hlt">Part</span> 150 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) CERTAIN BULK DANGEROUS CARGOES COMPATIBILITY OF CARGOES Pt. 150, App. IV Appendix IV to <span class="hlt">Part</span> 150—Data Sheet EC02<span class="hlt">FE</span>91.080 EC02<span class="hlt">FE</span>91.081 ...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010OLEB...40..253M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010OLEB...40..253M"><span>The <span class="hlt">Fe</span>-Rich Clay Microsystems in Basalt-Komatiite Lavas: Importance of <span class="hlt">Fe</span>-Smectites for Pre-Biotic Molecule Catalysis During the Hadean Eon</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Meunier, Alain; Petit, Sabine; Cockell, Charles S.; El Albani, Abderrazzak; Beaufort, Daniel</p> <p>2010-06-01</p> <p>During the Hadean to early Archean period (4.5-3.5 Ga), the surface of the Earth’s crust was predominantly composed of basalt and komatiite lavas. The conditions imposed by the chemical composition of these rocks favoured the crystallization of <span class="hlt">Fe</span>-Mg clays rather than that of Al-rich ones (montmorillonite). <span class="hlt">Fe</span>-Mg clays were formed inside chemical microsystems through sea weathering or hydrothermal alteration, and for the most <span class="hlt">part</span>, through post-magmatic processes. Indeed, at the end of the cooling stage, <span class="hlt">Fe</span>-Mg clays precipitated directly from the residual liquid which concentrated in the voids remaining in the crystal framework of the mafic-ultramafic lavas. Nontronite-celadonite and chlorite-saponite covered all the solid surfaces (crystals, glass) and are associated with tiny pyroxene and apatite crystals forming the so-called “mesostasis”. The mesostasis was scattered in the lava body as micro-settings tens of micrometres wide. Thus, every square metre of basalt or komatiite rocks was punctuated by myriads of clay-rich patches, each of them potentially behaving as a single chemical reactor which could concentrate the organics diluted in the ocean water. Considering the high catalytic potentiality of clays, and particularly those of the <span class="hlt">Fe</span>-rich ones (electron exchangers), it is probable that large <span class="hlt">parts</span> of the surface of the young Earth participated in the synthesis of prebiotic molecules during the Hadean to early Archean period through innumerable clay-rich micro-settings in the massive <span class="hlt">parts</span> and the altered surfaces of komatiite and basaltic lavas. This leads us to suggest that <span class="hlt">Fe</span>,Mg-clays should be preferred to Al-rich ones (montmorillonite) to conduct experiments for the synthesis and the polymerisation of prebiotic molecules.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013MolPh.111.2942S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013MolPh.111.2942S"><span>Back-clocking of <span class="hlt">Fe</span>2+/<span class="hlt">Fe</span>1+ spin states in a H2-producing catalyst by advanced EPR</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Stathi, Panagiota; Mitrikas, George; Sanakis, Yiannis; Louloudi, Maria; Deligiannakis, Yiannis</p> <p>2013-10-01</p> <p>A mononuclear <span class="hlt">Fe</span>-(P(PPh2)3) ((P(PPh2)3) = tris[2-diphenylphospino)ethyl]phosphine) catalyst was studied in situ under catalytic conditions using advanced electron paramagnetic resonance (EPR) techniques. <span class="hlt">Fe</span>-(P(PPh2)3) efficiently catalyses H2 production using HCOOH as substrate. Dual-mode continuous-wave (CW) EPR, used to study the initial <span class="hlt">Fe</span>2+(S = 2) state, shows that the complex is characterised by a - rather small - zero field splitting parameter Δ = 0.45 cm-1 and geff = 8.0. In the presence of HCOOH substrate the complex evolves and a unique <span class="hlt">Fe</span>1+(S = 1/2) state is trapped. The <span class="hlt">Fe</span>1+ atom is coordinated by four 31P nuclei in a pseudo-C3 symmetry. Only a small fraction of the <span class="hlt">Fe</span>1+ spin density is delocalised onto the 31P atoms. Four-pulse electron spin echo envelope modulation (ESEEM) and two-dimensional hyperfine sublevel correlation spectroscopy (2D-HYSCORE) data reveal the existence of two types of 1H couplings. One corresponds to weak, purely dipolar coupling, tentatively assigned to phenyl protons. The most important is a - rather unusual - 1H coupling with negative Aiso (-2.75 MHz) and strong dipolar <span class="hlt">part</span> (T = 5.5 MHz). This 1H is located on the pseudo-C3 symmetry axis of the <span class="hlt">Fe</span>1+-(P(PPh2)3-HCOO- complex where one substrate molecule, formate anion, is coordinated on the <span class="hlt">Fe</span>1+ atom.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/23471871','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/23471871"><span>Energies and spin states of <span class="hlt">Fe</span>S(0/-), <span class="hlt">Fe</span>S2(0/-), <span class="hlt">Fe</span>2S2(0/-), <span class="hlt">Fe</span>3S4(0/-), and <span class="hlt">Fe</span>4S4(0/-) clusters.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Li, Yan-Ni; Wang, Shengguang; Wang, Tao; Gao, Rui; Geng, Chun-Yu; Li, Yong-Wang; Wang, Jianguo; Jiao, Haijun</p> <p>2013-04-15</p> <p>The structures and energies of the electronic ground states of the <span class="hlt">Fe</span>S(0/-), <span class="hlt">Fe</span>S2(0/-), <span class="hlt">Fe</span>2S2(0/-), <span class="hlt">Fe</span>3S4(0/-), and <span class="hlt">Fe</span>4S4(0/-) neutral and anionic clusters have been computed systematically with nine computational methods in combination with seven basis sets. The computed adiabatic electronic affinities (AEA) have been compared with available experimental data. Most reasonable agreements between theory and experiment have been found for both hybrid B3LYP and B3PW91 functionals in conjugation with 6-311+G* and QZVP basis sets. Detailed comparisons between the available experimental and computed AEA data at the B3LYP/6-311+G* level identified the electronic ground state of (5)Δ for <span class="hlt">Fe</span>S, (4)Δ for <span class="hlt">Fe</span>S(-), (5)B2 for <span class="hlt">Fe</span>S2, (6)A1 for <span class="hlt">Fe</span>S2(-), (1)A1 for <span class="hlt">Fe</span>2S2, (8)A' for <span class="hlt">Fe</span>2S2(-), (5)A'' for <span class="hlt">Fe</span>3S4, (6)A'' for <span class="hlt">Fe</span>3S4(-), (1)A1 for <span class="hlt">Fe</span>4S4, and (1)A2 for <span class="hlt">Fe</span>4S4(-). In addition, <span class="hlt">Fe</span>2S2, <span class="hlt">Fe</span>3S4, <span class="hlt">Fe</span>3S4(-), <span class="hlt">Fe</span>4S4, and <span class="hlt">Fe</span>4S4(-) are antiferromagnetic at the B3LYP/6-311+G* level. The magnetic properties are discussed on the basis of natural bond orbital analysis. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5011689','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5011689"><span>Giant strain control of magnetoelectric effect in Ta|<span class="hlt">Fe</span>|MgO</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Odkhuu, Dorj</p> <p>2016-01-01</p> <p>The exploration of electric field controlled magnetism has come under scrutiny for its intriguing magnetoelectric phenomenon as well as technological advances in spintronics. Herein, the tremendous effect of an epitaxial strain on voltage-controlled perpendicular magnetic anisotropy (VPMA) is demonstrated in a transition-metal|ferromagnet|MgO (TM|FM|MgO) heterostructure from first-principles electronic structure computation. By tuning the epitaxial strain in Ta|<span class="hlt">Fe</span>|MgO as a <span class="hlt">model</span> system of TM|FM|MgO, we find distinctly different behaviours of VPMA from V- to Λ-shape trends with a substantially large magnetoelectric coefficient, up to an order of 103 fJV−1m−1. We further reveal that the VPMA modulation under strain is mainly governed by the inherently large spin-orbit coupling of Ta 5d–<span class="hlt">Fe</span> 3d hybridized orbitals at the TM|FM interface, although the <span class="hlt">Fe</span> 3d–O 2p hybridization at the FM|MgO interface is <span class="hlt">partly</span> responsible in determining the PMA of Ta|<span class="hlt">Fe</span>|MgO. These results suggest that the control of epitaxial strain enables the engineering of VPMA, and provides physical insights for the divergent behaviors of VPMA and magnetoelectric coefficients found in TM|FM|MgO experiments. PMID:27597448</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2013-title49-vol1/pdf/CFR-2013-title49-vol1-part20-appB.pdf','CFR2013'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2013-title49-vol1/pdf/CFR-2013-title49-vol1-part20-appB.pdf"><span>49 CFR Appendix B to <span class="hlt">Part</span> 20 - Disclosure Form To Report Lobbying</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>... 49 Transportation 1 2013-10-01 2013-10-01 false Disclosure Form To Report Lobbying B Appendix B to <span class="hlt">Part</span> 20 Transportation Office of the Secretary of Transportation NEW RESTRICTIONS ON LOBBYING Pt. 20, App. B Appendix B to <span class="hlt">Part</span> 20—Disclosure Form To Report Lobbying EC02<span class="hlt">FE</span>91.097 EC02<span class="hlt">FE</span>91.098 EC02<span class="hlt">FE</span>91.099 ...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2011-title49-vol1/pdf/CFR-2011-title49-vol1-part20-appB.pdf','CFR2011'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2011-title49-vol1/pdf/CFR-2011-title49-vol1-part20-appB.pdf"><span>49 CFR Appendix B to <span class="hlt">Part</span> 20 - Disclosure Form To Report Lobbying</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-10-01</p> <p>... 49 Transportation 1 2011-10-01 2011-10-01 false Disclosure Form To Report Lobbying B Appendix B to <span class="hlt">Part</span> 20 Transportation Office of the Secretary of Transportation NEW RESTRICTIONS ON LOBBYING Pt. 20, App. B Appendix B to <span class="hlt">Part</span> 20—Disclosure Form To Report Lobbying EC02<span class="hlt">FE</span>91.097 EC02<span class="hlt">FE</span>91.098 EC02<span class="hlt">FE</span>91.09...</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_8");'>8</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li class="active"><span>10</span></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_10 --> <div id="page_11" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li class="active"><span>11</span></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="201"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title49-vol1/pdf/CFR-2010-title49-vol1-part20-appB.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title49-vol1/pdf/CFR-2010-title49-vol1-part20-appB.pdf"><span>49 CFR Appendix B to <span class="hlt">Part</span> 20 - Disclosure Form To Report Lobbying</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-10-01</p> <p>... 49 Transportation 1 2010-10-01 2010-10-01 false Disclosure Form To Report Lobbying B Appendix B to <span class="hlt">Part</span> 20 Transportation Office of the Secretary of Transportation NEW RESTRICTIONS ON LOBBYING Pt. 20, App. B Appendix B to <span class="hlt">Part</span> 20—Disclosure Form To Report Lobbying EC02<span class="hlt">FE</span>91.097 EC02<span class="hlt">FE</span>91.098 EC02<span class="hlt">FE</span>91.09...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/28488864','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/28488864"><span>Temperature and Pressure Dependences of the Reactions of <span class="hlt">Fe</span>+ with Methyl Halides CH3X (X = Cl, Br, I): Experiments and Kinetic <span class="hlt">Modeling</span> Results.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Ard, Shaun G; Shuman, Nicholas S; Martinez, Oscar; Keyes, Nicholas R; Viggiano, Albert A; Guo, Hua; Troe, Jürgen</p> <p>2017-06-01</p> <p>The pressure and temperature dependences of the reactions of <span class="hlt">Fe</span> + with methyl halides CH 3 X (X = Cl, Br, I) in He were measured in a selected ion flow tube over the ranges 0.4 to 1.2 Torr and 300-600 K. <span class="hlt">Fe</span>X + was observed for all three halides and <span class="hlt">Fe</span>CH 3 + was observed for the CH 3 I reaction. <span class="hlt">Fe</span>CH 3 X + adducts (for all X) were detected in all reactions. The results were interpreted assuming two-state reactivity with spin-inversions between sextet and quartet potentials. Kinetic <span class="hlt">modeling</span> allowed for a quantitative representation of the experiments and for extrapolation to conditions outside the experimentally accessible range. The <span class="hlt">modeling</span> required quantum-chemical calculations of molecular parameters and detailed accounting of angular momentum effects. The results show that the <span class="hlt">Fe</span>X + products come via an insertion mechanism, while the <span class="hlt">Fe</span>CH 3 + can be produced from either insertion or S N 2 mechanisms, but the latter we conclude is unlikely at thermal energies. A statistical <span class="hlt">modeling</span> cannot reproduce the competition between the bimolecular pathways in the CH 3 I reaction, indicating that some more direct process must be important.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018JMS...182...67S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018JMS...182...67S"><span>Impact on the <span class="hlt">Fe</span> redox cycling of organic ligands released by Synechococcus PCC 7002, under different iron fertilization scenarios. <span class="hlt">Modeling</span> approach</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Samperio-Ramos, Guillermo; González-Dávila, Melchor; Santana-Casiano, J. Magdalena</p> <p>2018-06-01</p> <p>The kinetics of <span class="hlt">Fe</span> redox transformations are of crucial importance in determining the bioavailability of iron, due to inorganic <span class="hlt">Fe</span>(II) and <span class="hlt">Fe</span> weakly organic complexes being the most easily assimilated species by phytoplankton. The role played by the natural organic ligands excreted by the cyanobacteria Synecococcus PCC 7002 on the iron redox chemistry was studied at different stages of growth, considering changes in the organic exudation of the cyanobacteria, associated with growth under two different scenarios of iron availability. The oxidation/reduction processes of iron were studied at nanomolar levels and under different physicochemical conditions of pH (7.2- 8.2), temperature (5- 35 °C) and salinity (10- 37). The presence of natural organic exudates of Synechococcus affected the redox behavior of iron. A pH-dependent and photo-induced <span class="hlt">Fe</span>(III) reduction process was detected in the presence of exudates produced under <span class="hlt">Fe</span>-Low conditions. Photolytic reactions also modified the reactivity of those exudates with respect to <span class="hlt">Fe</span>(II), increasing its lifetime in seawater. Without light mediated processes, organic ligands excreted under iron deficient conditions intensified the <span class="hlt">Fe</span>(II) oxidation at pH < 7.5. The organic exudates released under High-<span class="hlt">Fe</span> conditions retarded the <span class="hlt">Fe</span>(II) oxidation rate, as a function of DOC produced. The changes in the apparent oxidation rate were fitted to polynomial functions for both of the <span class="hlt">Fe</span>-scenarios considered. A kinetic <span class="hlt">modeling</span> approach to describe the speciation and the contribution of individual <span class="hlt">Fe</span>(II) species to the overall oxidation rate was applied, considering the experimental data and delimiting the equilibrium and redox constants between iron and the major ligands present in solution. Two organic type ligands for the exudates of Synechococcus PCC 7002, with different iron-chelation properties were included in the <span class="hlt">model</span>. The <span class="hlt">Fe</span>(II) speciation was radically affected when organic ligands were considered. The individual</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013MMTB...44..820C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013MMTB...44..820C"><span>Viscosity of SiO2-"<span class="hlt">Fe</span>O"-Al2O3 System in Equilibrium with Metallic <span class="hlt">Fe</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Chen, Mao; Raghunath, Sreekanth; Zhao, Baojun</p> <p>2013-08-01</p> <p>The present study delivered the measurements of viscosities in SiO2-"<span class="hlt">Fe</span>O"-Al2O3 system in equilibrium with metallic <span class="hlt">Fe</span>. The rotational spindle technique was used in the measurements at the temperature range of 1473 K to 1773 K (1200 °C to 1500 °C). Molybdenum crucibles and spindles were employed in all measurements. The <span class="hlt">Fe</span> saturation condition was maintained by an iron plate placed at the bottom of the crucible. The equilibrium compositions of the slags were measured by EPMA after the viscosity measurements. The effect of up to 20 mol. pct Al2O3 on the viscosity of the SiO2-"<span class="hlt">Fe</span>O" slag was investigated. The "charge compensation effect" of the Al2O3 and <span class="hlt">Fe</span>O association has been discussed. The modified quasi-chemical viscosity <span class="hlt">model</span> has been optimized in the SiO2-"<span class="hlt">Fe</span>O"-Al2O3 system in equilibrium with metallic <span class="hlt">Fe</span> to describe the viscosity measurements of the present study.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/22577839','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/22577839"><span><span class="hlt">Fe</span> atom exchange between aqueous <span class="hlt">Fe</span>2+ and magnetite.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Gorski, Christopher A; Handler, Robert M; Beard, Brian L; Pasakarnis, Timothy; Johnson, Clark M; Scherer, Michelle M</p> <p>2012-11-20</p> <p>The reaction between magnetite and aqueous <span class="hlt">Fe</span>(2+) has been extensively studied due to its role in contaminant reduction, trace-metal sequestration, and microbial respiration. Previous work has demonstrated that the reaction of <span class="hlt">Fe</span>(2+) with magnetite (<span class="hlt">Fe</span>(3)O(4)) results in the structural incorporation of <span class="hlt">Fe</span>(2+) and an increase in the bulk <span class="hlt">Fe</span>(2+) content of magnetite. It is unclear, however, whether significant <span class="hlt">Fe</span> atom exchange occurs between magnetite and aqueous <span class="hlt">Fe</span>(2+), as has been observed for other <span class="hlt">Fe</span> oxides. Here, we measured the extent of <span class="hlt">Fe</span> atom exchange between aqueous <span class="hlt">Fe</span>(2+) and magnetite by reacting isotopically "normal" magnetite with (57)<span class="hlt">Fe</span>-enriched aqueous <span class="hlt">Fe</span>(2+). The extent of <span class="hlt">Fe</span> atom exchange between magnetite and aqueous <span class="hlt">Fe</span>(2+) was significant (54-71%), and went well beyond the amount of <span class="hlt">Fe</span> atoms found at the near surface. Mössbauer spectroscopy of magnetite reacted with (56)<span class="hlt">Fe</span>(2+) indicate that no preferential exchange of octahedral or tetrahedral sites occurred. Exchange experiments conducted with Co-ferrite (Co(2+)<span class="hlt">Fe</span>(2)(3+)O(4)) showed little impact of Co substitution on the rate or extent of atom exchange. Bulk electron conduction, as previously invoked to explain <span class="hlt">Fe</span> atom exchange in goethite, is a possible mechanism, but if it is occurring, conduction does not appear to be the rate-limiting step. The lack of significant impact of Co substitution on the kinetics of <span class="hlt">Fe</span> atom exchange, and the relatively high diffusion coefficients reported for magnetite suggest that for magnetite, unlike goethite, <span class="hlt">Fe</span> atom diffusion is a plausible mechanism to explain the rapid rates of <span class="hlt">Fe</span> atom exchange in magnetite.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018JEMat.tmp..166Y','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018JEMat.tmp..166Y"><span>Electrical Conduction of Ba(Ti0.99<span class="hlt">Fe</span>0.01)O3-δ Ceramic at High Temperatures</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Yu, Zi-De; Chen, Xiao-Ming</p> <p>2018-03-01</p> <p>BaTiO3 and Ba(Ti0.99<span class="hlt">Fe</span>0.01)O3-δ ceramics with dense microstructure have been synthesized by a solid-state reaction method, and their electrical conduction investigated by broadband electrical impedance spectroscopy at frequencies from 0.05 Hz to 3 × 106 Hz and temperatures from 200°C to 400°C. Compared with BaTiO3, the real <span class="hlt">part</span> of the permittivity and the phase-transition temperature of Ba(Ti0.99<span class="hlt">Fe</span>0.01)O3-δ decreased. Relaxation peaks appeared in the curves of the imaginary <span class="hlt">part</span> of the permittivity as a function of frequency. With increase in frequency, the peaks gradually shifted towards higher frequency and their height increased. Conductivity was closely related to frequency and temperature. Frequency-dependent conductivity was analyzed using the Jonscher double power law. Compared with BaTO3, Ba(Ti0.99<span class="hlt">Fe</span>0.01)O3-δ exhibited high impedance at given frequency and temperature. Impedance Cole-Cole plots displayed two semicircles, which could be well fit using two parallel RC equivalent circuit <span class="hlt">models</span>. The conductivity activation energy was found to be around 1 eV. For Ba(Ti0.99<span class="hlt">Fe</span>0.01)O3-δ , the electrical modulus curve versus frequency displayed two peaks.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018JEMat..47.3459Y','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018JEMat..47.3459Y"><span>Electrical Conduction of Ba(Ti0.99<span class="hlt">Fe</span>0.01)O3- δ Ceramic at High Temperatures</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Yu, Zi-De; Chen, Xiao-Ming</p> <p>2018-07-01</p> <p>BaTiO3 and Ba(Ti0.99<span class="hlt">Fe</span>0.01)O3- δ ceramics with dense microstructure have been synthesized by a solid-state reaction method, and their electrical conduction investigated by broadband electrical impedance spectroscopy at frequencies from 0.05 Hz to 3 × 106 Hz and temperatures from 200°C to 400°C. Compared with BaTiO3, the real <span class="hlt">part</span> of the permittivity and the phase-transition temperature of Ba(Ti0.99<span class="hlt">Fe</span>0.01)O3- δ decreased. Relaxation peaks appeared in the curves of the imaginary <span class="hlt">part</span> of the permittivity as a function of frequency. With increase in frequency, the peaks gradually shifted towards higher frequency and their height increased. Conductivity was closely related to frequency and temperature. Frequency-dependent conductivity was analyzed using the Jonscher double power law. Compared with BaTO3, Ba(Ti0.99<span class="hlt">Fe</span>0.01)O3- δ exhibited high impedance at given frequency and temperature. Impedance Cole-Cole plots displayed two semicircles, which could be well fit using two parallel RC equivalent circuit <span class="hlt">models</span>. The conductivity activation energy was found to be around 1 eV. For Ba(Ti0.99<span class="hlt">Fe</span>0.01)O3- δ , the electrical modulus curve versus frequency displayed two peaks.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://pubs.er.usgs.gov/publication/70159278','USGSPUBS'); return false;" href="https://pubs.er.usgs.gov/publication/70159278"><span>Monitoring, field experiments, and geochemical <span class="hlt">modeling</span> of <span class="hlt">Fe</span>(II) oxidation kinetics in a stream dominated by net-alkaline coal-mine drainage, Pennsylvania, USA</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Cravotta, Charles A.</p> <p>2015-01-01</p> <p>Watershed-scale monitoring, field aeration experiments, and geochemical equilibrium and kinetic <span class="hlt">modeling</span> were conducted to evaluate interdependent changes in pH, dissolved CO2, O2, and <span class="hlt">Fe</span>(II) concentrations that typically take place downstream of net-alkaline, circumneutral coal-mine drainage (CMD) outfalls and during aerobic treatment of such CMD. The kinetic <span class="hlt">modeling</span> approach, using PHREEQC, accurately simulates observed variations in pH, <span class="hlt">Fe</span>(II) oxidation, alkalinity consumption, and associated dissolved gas concentrations during transport downstream of the CMD outfalls (natural attenuation) and during 6-h batch aeration tests on the CMD using bubble diffusers (enhanced attenuation). The batch aeration experiments demonstrated that aeration promoted CO2 outgassing, thereby increasing pH and the rate of <span class="hlt">Fe</span>(II) oxidation. The rate of <span class="hlt">Fe</span>(II) oxidation was accurately estimated by the abiotic homogeneous oxidation rate law −d[<span class="hlt">Fe</span>(II)]/dt = k1·[O2]·[H+]−2·[<span class="hlt">Fe</span>(II)] that indicates an increase in pH by 1 unit at pH 5–8 and at constant dissolved O2 (DO) concentration results in a 100-fold increase in the rate of <span class="hlt">Fe</span>(II) oxidation. Adjusting for sample temperature, a narrow range of values for the apparent homogeneous <span class="hlt">Fe</span>(II) oxidation rate constant (k1′) of 0.5–1.7 times the reference value of k1 = 3 × 10−12 mol/L/min (for pH 5–8 and 20 °C), reported by Stumm and Morgan (1996), was indicated by the calibrated <span class="hlt">models</span> for the 5-km stream reach below the CMD outfalls and the aerated CMD. The rates of CO2 outgassing and O2ingassing in the <span class="hlt">model</span> were estimated with first-order asymptotic functions, whereby the driving force is the gradient of the dissolved gas concentration relative to equilibrium with the ambient atmosphere. Although the progressive increase in DO concentration to saturation could be accurately <span class="hlt">modeled</span> as a kinetic function for the conditions evaluated, the simulation of DO as an instantaneous equilibrium process did not affect the</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018GeCoA.225..116W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018GeCoA.225..116W"><span>Kinetics of <span class="hlt">Fe</span>II-polyaminocarboxylate oxidation by molecular oxygen</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wilson, Jessica M.; Farley, Kevin J.; Carbonaro, Richard F.</p> <p>2018-03-01</p> <p>Complexation of iron by naturally-occurring and synthetic organic ligands has a large effect on iron oxidation and reduction rates which in turn affect the aqueous geochemistry of many other chemical constituents. In this study, the kinetics of <span class="hlt">Fe</span>II oxidation in the presence of the polyaminocarboxylate synthetic chelating agents ethylene glycol tetraacetic acid (EGTA) and trimethylenediamine-N,N,N‧,N‧-tetraacetic acid (TMDTA) was investigated over the pH range 5.50-8.53. Batch oxidation experiments in the presence of molecular oxygen were conducted using a 2:1 M concentration ratio of polyaminocarboxylate (ligand, L) to <span class="hlt">Fe</span>II. The experimental data resembled first order kinetics for the oxidation of <span class="hlt">Fe</span>II-L to <span class="hlt">Fe</span>III-L and observed rate constants at pH 6.0 were comparable to rate constants for the oxidation of inorganic <span class="hlt">Fe</span>II. Similar to other structurally-similar <span class="hlt">Fe</span>II-polyaminocarboxylate complexes, oxidation rates of <span class="hlt">Fe</span>II-EGTA and <span class="hlt">Fe</span>II-TMDTA decrease with increasing pH, which is the opposite trend for the oxidation of <span class="hlt">Fe</span>II complexed with inorganic ligands. However, the oxidation rates of <span class="hlt">Fe</span>II complexed with EGTA and TMDTA were considerably lower (4-5 orders of magnitude) than <span class="hlt">Fe</span>II complexed to ethylenediaminetetraacetic acid (EDTA). The distinguishing feature of the slower-reacting complexes is that they have a longer backbone between diamine functional groups. An analytical equilibrium <span class="hlt">model</span> was developed to determine the contributions of the species <span class="hlt">Fe</span>IIL2- and <span class="hlt">Fe</span>II(H)L- to the overall oxidation rate of <span class="hlt">Fe</span>II-L. Application of this <span class="hlt">model</span> indicated that the protonated <span class="hlt">Fe</span>II(H)L species are more than three orders of magnitude more reactive than <span class="hlt">Fe</span>IIL2-. These rate constants were used in a coupled kinetic equilibrium numerical <span class="hlt">model</span> where the ligand to iron ratio (TOTL:TOTFe) and pH were varied to evaluate the effect on the <span class="hlt">Fe</span>II oxidation rate. Overall, increasing TOTL:TOTFe for EGTA and TMDTA enhances <span class="hlt">Fe</span>II oxidation rates at lower pH and inhibits <span class="hlt">Fe</span>II oxidation</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/22310658-controllable-exchange-bias-fe-metamagnetic-ferh-bilayers','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/22310658-controllable-exchange-bias-fe-metamagnetic-ferh-bilayers"><span>Controllable exchange bias in <span class="hlt">Fe</span>/metamagnetic <span class="hlt">Fe</span>Rh bilayers</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Suzuki, Ippei; Hamasaki, Yosuke; Itoh, Mitsuru</p> <p>2014-10-27</p> <p>We report the studies of tuning the exchange bias at ferromagnetic <span class="hlt">Fe</span>/metamagnetic <span class="hlt">Fe</span>Rh bilayer interfaces. <span class="hlt">Fe/Fe</span>Rh(111) bilayers show exchange bias in the antiferromagnetic state of <span class="hlt">Fe</span>Rh while no exchange bias occurs at <span class="hlt">Fe/Fe</span>Rh(001) interface. The contrasting results are attributed to the spin configurations of <span class="hlt">Fe</span>Rh at the interface, i.e., the uncompensated ferromagnetic spin configuration of <span class="hlt">Fe</span>Rh appears exclusively for (111) orientation. The exchange bias disappears as the bilayers are warmed above the antiferromagnetic-ferromagnetic transition temperature. The direction of the exchange bias for <span class="hlt">Fe/Fe</span>Rh(111) is also found to be perpendicular to the cooling-field direction, in contrast to the commonly observed directionmore » of exchange bias for ferromagnetic/antiferromagnetic interfaces. In view of these results, the exchange bias in <span class="hlt">Fe/Fe</span>Rh bilayers with the (111) crystallographic orientation should be useful for the design of rapid writing technology for magnetic information devices.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26488197','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26488197"><span>[Ni<span class="hlt">Fe</span>Se]-hydrogenase chemistry.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Wombwell, Claire; Caputo, Christine A; Reisner, Erwin</p> <p>2015-11-17</p> <p>The development of technology for the inexpensive generation of the renewable energy vector H2 through water splitting is of immediate economic, ecological, and humanitarian interest. Recent interest in hydrogenases has been fueled by their exceptionally high catalytic rates for H2 production at a marginal overpotential, which is presently only matched by the nonscalable noble metal platinum. The mechanistic understanding of hydrogenase function guides the design of synthetic catalysts, and selection of a suitable hydrogenase enables direct applications in electro- and photocatalysis. [<span class="hlt">FeFe</span>]-hydrogenases display excellent H2 evolution activity, but they are irreversibly damaged upon exposure to O2, which currently prevents their use in full water splitting systems. O2-tolerant [Ni<span class="hlt">Fe</span>]-hydrogenases are known, but they are typically strongly biased toward H2 oxidation, while H2 production by [Ni<span class="hlt">Fe</span>]-hydrogenases is often product (H2) inhibited. [Ni<span class="hlt">Fe</span>Se]-hydrogenases are a subclass of [Ni<span class="hlt">Fe</span>]-hydrogenases with a selenocysteine residue coordinated to the active site nickel center in place of a cysteine. They exhibit a combination of unique properties that are highly advantageous for applications in water splitting compared with other hydrogenases. They display a high H2 evolution rate with marginal inhibition by H2 and tolerance to O2. [Ni<span class="hlt">Fe</span>Se]-hydrogenases are therefore one of the most active molecular H2 evolution catalysts applicable in water splitting. Herein, we summarize our recent progress in exploring the unique chemistry of [Ni<span class="hlt">Fe</span>Se]-hydrogenases through biomimetic <span class="hlt">model</span> chemistry and the chemistry with [Ni<span class="hlt">Fe</span>Se]-hydrogenases in semiartificial photosynthetic systems. We gain perspective from the structural, spectroscopic, and electrochemical properties of the [Ni<span class="hlt">Fe</span>Se]-hydrogenases and compare them with the chemistry of synthetic <span class="hlt">models</span> of this hydrogenase active site. Our synthetic <span class="hlt">models</span> give insight into the effects on the electronic properties and reactivity of</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5662183','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5662183"><span>Ethylenediamine grafted to graphene oxide@<span class="hlt">Fe</span>3O4 for chromium(VI) decontamination: Performance, <span class="hlt">modelling</span>, and fractional factorial design</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Xu, Jiawen; Wu, Cuiyu; Deng, Jianbin; Liao, Wenwei; Ling, Yuxiang; Yang, Yuanxiu; Zhao, Yina; Zhao, Yunlin; Hu, Xi; Wang, Hui; Liu, Yunguo</p> <p>2017-01-01</p> <p>A method for grafting ethylenediamine to a magnetic graphene oxide composite (EDA-GO@<span class="hlt">Fe</span>3O4) was developed for Cr(VI) decontamination. The physicochemical properties of EDA-GO@<span class="hlt">Fe</span>3O4 were characterized using HRTEM, EDS, FT-IR, TG-DSC, and XPS. The effects of pH, sorbent dose, foreign anions, time, Cr(VI) concentration, and temperature on decontamination process were studied. The solution pH can largely affect the decontamination process. The pseudo-second-order <span class="hlt">model</span> is suitable for being applied to fit the adsorption processes of Cr(VI) with GO@<span class="hlt">Fe</span>3O4 and EDA-GO@<span class="hlt">Fe</span>3O4. The intra-particle diffusion is not the rate-controlling step. Isotherm experimental data can be described using the Freundlich <span class="hlt">model</span>. The effects of multiple factors on the Cr(VI) decontamination was investigated by a 25−1 fractional factorial design (FFD). The adsorption process can significantly be affected by the main effects of A (pH), B (Cr(VI) concentration), and E (Adsorbent dose). The combined factors of AB (pH × Cr(VI) concentration), AE (pH × Adsorbent dose), and BC (Cr(VI) concentration × Temperature) had larger effects than other factors on Cr(VI) removal. These results indicated that EDA-GO@<span class="hlt">Fe</span>3O4 is a potential and suitable candidate for treatment of heavy metal wastewater. PMID:29084287</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/27690423','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/27690423"><span>Effectiveness of <span class="hlt">Fe</span>EDDHA, <span class="hlt">Fe</span>EDDHMA, and <span class="hlt">Fe</span>HBED in Preventing Iron-Deficiency Chlorosis in Soybean.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Bin, Levi M; Weng, Liping; Bugter, Marcel H J</p> <p>2016-11-09</p> <p>The performance of <span class="hlt">Fe</span>HBED in preventing <span class="hlt">Fe</span> deficiency chlorosis in soybean (Glycine max (L.) Merr.) in comparison to <span class="hlt">Fe</span>EDDHA and <span class="hlt">Fe</span>EDDHMA was studied, as well as the importance of the ortho-ortho and ortho-para/rest isomers in defining the performance. To this end, chlorophyll production (SPAD), plant dry matter yield, and the mass fractions of important mineral elements in the plant were quantified in a greenhouse pot experiment. All three <span class="hlt">Fe</span> chelates increased SPAD index and dry matter yield compared to the control. The effect of <span class="hlt">Fe</span>HBED on chlorophyll production was visible over a longer time span than that of <span class="hlt">Fe</span>EDDHA and <span class="hlt">Fe</span>EDDHMA. Additionally, <span class="hlt">Fe</span>HBED did not suppress Mn uptake as much as the other <span class="hlt">Fe</span> chelates. Compared to the other <span class="hlt">Fe</span> chelates, total <span class="hlt">Fe</span> content in the young leaves was lower in the <span class="hlt">Fe</span>HBED treatment; however, total <span class="hlt">Fe</span> content was not directly related to chlorophyll production and biomass yield. For each chelate, the ortho-ortho isomer was found to be more effective than the other isomers evaluated.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013A%26A...549A..72P','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013A%26A...549A..72P"><span>Multiwavelength campaign on Mrk 509. XI. Reverberation of the <span class="hlt">Fe</span> Kα line</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ponti, G.; Cappi, M.; Costantini, E.; Bianchi, S.; Kaastra, J. S.; De Marco, B.; Fender, R. P.; Petrucci, P.-O.; Kriss, G. A.; Steenbrugge, K. C.; Arav, N.; Behar, E.; Branduardi-Raymont, G.; Dadina, M.; Ebrero, J.; Lubiński, P.; Mehdipour, M.; Paltani, S.; Pinto, C.; Tombesi, F.</p> <p>2013-01-01</p> <p>Context. We report on a detailed study of the <span class="hlt">Fe</span> K emission/absorption complex in the nearby, bright Seyfert 1 galaxy Mrk 509. The study is <span class="hlt">part</span> of an extensive XMM-Newton monitoring consisting of 10 pointings (~60 ks each) about once every 4 days, and includes a reanalysis of previous XMM-Newton and Chandra observations. Aims: We aim at understanding the origin and location of the <span class="hlt">Fe</span> K emission and absorption regions. Methods: We combine the results of time-resolved spectral analysis on both short and long time-scales including <span class="hlt">model</span>-independent rms spectra. Results: Mrk 509 shows a clear (EW = 58 ± 4 eV) neutral <span class="hlt">Fe</span> Kα emission line that can be decomposed into a narrow (σ = 0.027 keV) component (found in the Chandra HETG data) plus a resolved (σ = 0.22 keV) component. We find the first successful measurement of a linear correlation between the intensity of the resolved line component and the 3-10 keV flux variations on time scales of years down to a few days. The <span class="hlt">Fe</span> Kα reverberates the hard X-ray continuum without any measurable lag, suggesting that the region producing the resolved <span class="hlt">Fe</span> Kα component is located within a few light days to a week (r ≲ 103rg) from the black hole (BH). The lack of a redshifted wing in the line poses a lower limit of ≥40 rg for its distance from the BH. The <span class="hlt">Fe</span> Kα could thus be emitted from the inner regions of the BLR, i.e. within the ~80 light days indicated by the Hβ line measurements. In addition to these two neutral <span class="hlt">Fe</span> Kα components, we confirm the detection of weak (EW ~ 8-20 eV) ionised <span class="hlt">Fe</span> K emission. This ionised line can be <span class="hlt">modelled</span> with either a blend of two narrow <span class="hlt">Fe</span> xxv and <span class="hlt">Fe</span> xxvi emission lines (possibly produced by scattering from distant material) or with a single relativistic line produced, in an ionised disc, down to a few rg from the BH. In the latter interpretation, the presence of an ionised standard α-disc, down to a few rg, is consistent with the source high Eddington ratio. Finally, we observe a</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4510703','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4510703"><span>Molybdenum L-Edge XAS Spectra of Mo<span class="hlt">Fe</span> Nitrogenase</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Bjornsson, Ragnar; Delgado-Jaime, Mario U; Lima, Frederico A; Sippel, Daniel; Schlesier, Julia; Weyhermüller, Thomas; Einsle, Oliver; Neese, Frank; DeBeer, Serena</p> <p>2015-01-01</p> <p>A molybdenum L-edge X-ray absorption spectroscopy (XAS) study is presented for native and oxidized Mo<span class="hlt">Fe</span> protein of nitrogenase as well as Mo-<span class="hlt">Fe</span> <span class="hlt">model</span> compounds. Recently collected data on Mo<span class="hlt">Fe</span> protein (in oxidized and reduced forms) is compared to previously published Mo XAS data on the isolated <span class="hlt">Fe</span>Mo cofactor in NMF solution and put in context of the recent Mo K-edge XAS study, which showed a MoIII assignment for the molybdenum atom in <span class="hlt">Fe</span>Moco. The L3-edge data are interpreted within a simple ligand-field <span class="hlt">model</span>, from which a time-dependent density functional theory (TDDFT) approach is proposed as a way to provide further insights into the analysis of the molybdenum L3-edges. The calculated results reproduce well the relative spectral trends that are observed experimentally. Ultimately, these results give further support for the MoIII assignment in protein-bound <span class="hlt">Fe</span>Moco, as well as isolated <span class="hlt">Fe</span>Moco. PMID:26213424</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/22786574','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/22786574"><span>Photoinduced hydrogen evolution in supramolecular devices with a rhenium photosensitizer linked to <span class="hlt">FeFe</span>-hydrogenase <span class="hlt">model</span> complexes.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Liu, Jianhui; Jiang, Weina</p> <p>2012-08-28</p> <p>Coordination of the pyridyl-attached diiron azadithiolate hexacarbonyl complexes (2 and 3) through the pyridyl nitrogen to the Re on 10-phenanthroline rhenium (5a) and 2,9-diphenyl-1,10-phenanthroline rhenium (5b) forms novel [Re-<span class="hlt">Fe</span>] complexes 7a, 7b and 8 respectively. Under visible light illumination using triethylamine as a sacrificial electron donor and [Re-<span class="hlt">Fe</span>] type complexes (7a, 7b or 8) as catalysts, remarkably increased efficiency was observed for photoinduced hydrogen production with a turnover number reaching 11.8 from complex 7a and 8.75 from 7b. To the best of our knowledge, these are the best values compared to other [Re-<span class="hlt">Fe</span>] photocatalysts reported so far. In contrast to the parent molecules, the turnover number by the intermolecular combination of complexes 6a and 2 showed a value of 5.23, and that from 6b and 2 is 3.8, while no H(2) was detected from 8a and 3 under the same experimental conditions. Obviously, the intramolecular combination of rhenium(I) and [2<span class="hlt">Fe</span>2S] as a catalyst is promising for efficient H(2) evolution, and it is better than the intermolecular multi-component system.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009AGUFMDI33A1623T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009AGUFMDI33A1623T"><span>Thermoelastic properties of γ-<span class="hlt">Fe</span> and γ- <span class="hlt">Fe</span>64Ni36 alloys</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Tsujino, N.; Nishihara, Y.; Nakajima, Y.; Takahashi, E.; Funakoshi, K.</p> <p>2009-12-01</p> <p>The Earth’s core consists mainly of <span class="hlt">Fe</span>-Ni alloy. Therefore the physical property of <span class="hlt">Fe</span>-Ni alloy is a key issue to understand the planetary core. At 1 bar, γ-<span class="hlt">Fe</span> is known as Anti-Invar alloy which shows anomalously high thermal expansivity, while γ-<span class="hlt">Fe</span>64Ni36 is as a typical Inver-alloy. In addition, previous studies on γ-<span class="hlt">Fe</span>-Ni Invar-alloys reported an anomalous pressure dependence of compression behavior (e.g., Dubrovinsky et al., 2001, Nataf et al., 2006, Matsushita et al., 2008). However, these studies were conducted at limited pressure range (> 6 GPa) or low temperature (30-300 K) conditions to identify physical properties of those alloys in the planetary interior. Therefore, we performed pressure-volume-temperature (P-V-T) measurements on γ-<span class="hlt">Fe</span> and γ-<span class="hlt">Fe</span>-Ni alloys at a wide P-T range of 0-23 GPa and 773-1873 K using the SPEED- Mk.II kawai-type multi-anvil apparatus at the SPring-8 synchrotron facility. On the basis of 2-γ state <span class="hlt">model</span> by Weiss (1963), the thermal expansivity of γ-<span class="hlt">Fe</span> can be decreased significantly with pressure. Our data, however, show no anomalous variation in the thermal expansion coefficient relative to pressure up to 23 GPa. In addition, anomalous pressure dependence on volume of γ-<span class="hlt">Fe</span>64Ni36 reported by Matsushita et al. (2008) was not observed. Fitting 3rd order Birch-Murnaghan EOS and Mie-Grüneisen-Debye EOS to the P-V-T data of γ-<span class="hlt">Fe</span> yielded V 0 = 49.028 ± 0.027 Å 3 , K T 0 = 111.2 ± 1.8 GPa, K ’ T = 5.2 ± 0.2, γ 0 = 2.30 ± 0.04 and q = -0.09 ± 0.21 with the fixed value of θ 0 = 340 K. The P-V data of γ- <span class="hlt">Fe</span>64Ni36 was fittied using the 3rd order Birch-Marnagan, which yields V 0 = 48.85 ± 0.06 Å 3 , K T 0 = 88.1 ± 3.4 GPa, and K ’ 0 = 8.6± 0.5 at 1273 K.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/23576093','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/23576093"><span>Reaction mechanism of WGS and PROX reactions catalyzed by Pt/oxide catalysts revealed by an <span class="hlt">Fe</span>O(111)/Pt(111) inverse <span class="hlt">model</span> catalyst.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Xu, Lingshun; Wu, Zongfang; Jin, Yuekang; Ma, Yunsheng; Huang, Weixin</p> <p>2013-08-07</p> <p>We have employed XPS and TDS to study the adsorption and surface reactions of H2O, CO and HCOOH on an <span class="hlt">Fe</span>O(111)/Pt(111) inverse <span class="hlt">model</span> catalyst. The <span class="hlt">Fe</span>O(111)-Pt(111) interface of the <span class="hlt">Fe</span>O(111)/Pt(111) inverse <span class="hlt">model</span> catalyst exposes coordination-unsaturated <span class="hlt">Fe</span>(II) cations (<span class="hlt">Fe</span>(II)CUS) and the <span class="hlt">Fe</span>(II)CUS cations are capable of modifying the reactivity of neighbouring Pt sites. Water facilely dissociates on the <span class="hlt">Fe</span>(II)CUS cations at the <span class="hlt">Fe</span>O(111)-Pt(111) interface to form hydroxyls that react to form both water and H2 upon heating. Hydroxyls on the <span class="hlt">Fe</span>(II)CUS cations can react with CO(a) on the neighbouring Pt(111) sites to produce CO2 at low temperatures. Hydroxyls act as the co-catalyst in the CO oxidation by hydroxyls to CO2 (PROX reaction), while they act as one of the reactants in the CO oxidation by hydroxyls to CO2 and H2 (WGS reaction), and the recombinative reaction of hydroxyls to produce H2 is the rate-limiting step in the WGS reaction. A comparison of reaction behaviors between the interfacial CO(a) + OH reaction and the formate decomposition reaction suggest that formate is the likely surface intermediate of the CO(a) + OH reaction. These results provide some solid experimental evidence for the associative reaction mechanism of WGS and PROX reactions catalyzed by Pt/oxide catalysts.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/28232138','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/28232138"><span>Mechanisms of <span class="hlt">Fe</span> biofortification and mitigation of Cd accumulation in rice (Oryza sativa L.) grown hydroponically with <span class="hlt">Fe</span> chelate fertilization.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Chen, Zhe; Tang, Ye-Tao; Zhou, Can; Xie, Shu-Ting; Xiao, Shi; Baker, Alan J M; Qiu, Rong-Liang</p> <p>2017-05-01</p> <p>Cadmium contaminated rice from China has become a global food safety issue. Some research has suggested that chelate addition to substrates can affect metal speciation and plant metal content. We investigated the mitigation of Cd accumulation in hydroponically-grown rice supplied with EDTANa 2 <span class="hlt">Fe</span>(II) or EDDHAFe(III). A japonica rice variety (Nipponbare) was grown in modified Kimura B solution containing three concentrations (0, 10, 100 μΜ) of the iron chelates EDTANa 2 <span class="hlt">Fe</span>(II) or EDDHAFe(III) and 1 μΜ Cd. Metal speciation in solution was simulated by Geochem-EZ; growth and photosynthetic efficiency of rice were evaluated, and accumulation of Cd and <span class="hlt">Fe</span> in plant <span class="hlt">parts</span> was determined. Net Cd fluxes in the meristematic zone, growth zone, and maturation zone of roots were monitored by a non-invasive micro-test technology. Expression of <span class="hlt">Fe</span>- and Cd-related genes in <span class="hlt">Fe</span>-sufficient or <span class="hlt">Fe</span>-deficient roots and leaves were studied by QRT-PCR. Compared to <span class="hlt">Fe</span> deficiency, a sufficient or excess supply of <span class="hlt">Fe</span> chelates significantly enhanced rice growth by elevating photosynthetic efficiency. Both <span class="hlt">Fe</span> chelates increased the <span class="hlt">Fe</span> content and decreased the Cd content of rice organs, except for the Cd content of roots treated with excess EDDHAFe(III). Compared to EDDHAFe(III), EDTANa 2 <span class="hlt">Fe</span>(II) exhibited better mitigation of Cd accumulation in rice by generating the EDTANa 2 Cd complex in solution, decreasing net Cd influx and increasing net Cd efflux in root micro-zones. Application of EDTANa 2 <span class="hlt">Fe</span>(II) and EDDHAFe(III) also reduced Cd accumulation in rice by inhibiting expression of genes involved in transport of <span class="hlt">Fe</span> and Cd in the xylem and phloem. The 'win-win' situation of <span class="hlt">Fe</span> biofortification and Cd mitigation in rice was achieved by application of <span class="hlt">Fe</span> chelates. Root-to-stem xylem transport of Cd and redistribution of Cd in leaves by phloem transport can be regulated in rice through the use of <span class="hlt">Fe</span> chelates that influence <span class="hlt">Fe</span> availability and <span class="hlt">Fe</span>-related gene expression. <span class="hlt">Fe</span> fertilization</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017PhyB..525..119W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017PhyB..525..119W"><span>First-principles calculations of the structural, elastic and thermodynamic properties of mackinawite (<span class="hlt">Fe</span>S) and pyrite (<span class="hlt">Fe</span>S2)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wen, Xiangli; Liang, Yuxuan; Bai, Pengpeng; Luo, Bingwei; Fang, Teng; Yue, Luo; An, Teng; Song, Weiyu; Zheng, Shuqi</p> <p>2017-11-01</p> <p>The thermodynamic properties of <span class="hlt">Fe</span>-S compounds with different crystal structure are very different. In this study, the structural, elastic and thermodynamic properties of mackinawite (<span class="hlt">Fe</span>S) and pyrite (<span class="hlt">Fe</span>S2) were investigated by first-principles calculations. Examination of the electronic density of states shows that mackinawite (<span class="hlt">Fe</span>S) is metallic and that pyrite (<span class="hlt">Fe</span>S2) is a semiconductor with a band gap of Eg = 1.02 eV. Using the stress-strain method, the elastic properties including the bulk modulus and shear modulus were derived from the elastic Cij data. Density functional perturbation theory (DFPT) calculations within the quasi-harmonic approximation (QHA) were used to calculate the thermodynamic properties, and the two <span class="hlt">Fe</span>-S compounds are found to be dynamically stable. The isothermal bulk modulus, thermal expansion coefficient, heat capacities, Gibbs free energy and entropy of the <span class="hlt">Fe</span>-S compounds are obtained by first-principles phonon calculations. Furthermore, the temperature of the mackinawite (<span class="hlt">Fe</span>S) ⟶ pyrite (<span class="hlt">Fe</span>S2) phase transition at 0 GPa was predicted. Based on the calculation results, the <span class="hlt">model</span> for prediction of <span class="hlt">Fe</span>-S compounds in the <span class="hlt">Fe</span>-H2S-H2O system was improved.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_9");'>9</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li class="active"><span>11</span></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_11 --> <div id="page_12" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li class="active"><span>12</span></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="221"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1997PhDT........40F','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1997PhDT........40F"><span>Structure and magnetism in Co/X, <span class="hlt">Fe</span>/Si, and <span class="hlt">Fe/(Fe</span>Si) multilayers</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Franklin, Michael Ray</p> <p></p> <p>Previous studies have shown that magnetic behavior in multilayers formed by repeating a bilayer unit comprised of a ferromagnetic layer and a non-magnetic spacer layer can be affected by small structural differences. For example, a macroscopic property such as giant magnetoresistance (GMR) is believed to depend significantly upon interfacial roughness. In this study, several complimentary structural probes were used to carefully characterize the structure of several sputtered multilayer systems-Co/Ag, Co/Cu, Co/Mo, <span class="hlt">Fe</span>/Si, and <span class="hlt">Fe//[Fe</span>Si/]. X-ray diffraction (XRD) studies were used to examine the long-range structural order of the multilayers perpendicular to the plane of the layers. Transmission electron diffraction (TED) studies were used to probe the long-range order parallel to the layer plane. X-ray Absorption Fine Structure (XAFS) studies were used to determine the average local structural environment of the ferromagnetic atoms. For the Co/X systems, a simple correlation between crystal structure and saturation magnetization is discovered for the Co/Mo system. For the <span class="hlt">Fe</span>/X systems, direct evidence of an <span class="hlt">Fe</span>-silicide is found for the /[<span class="hlt">Fe</span>Si/] spacer layer but not for the Si spacer layer. Additionally, differences were observed in the magnetic behavior between the <span class="hlt">Fe</span> in the nominally pure <span class="hlt">Fe</span> layer and the <span class="hlt">Fe</span> contained in the /[<span class="hlt">Fe</span>Si/] spacer layers.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1984MTA....15..889Y','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1984MTA....15..889Y"><span>Fatigue threshold studies in <span class="hlt">Fe</span>, <span class="hlt">Fe</span>-Si, and HSLA steel: <span class="hlt">Part</span> II. thermally activated behavior of the effective stress intensity at threshold</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Yu, W.; Esaklul, K.; Gerberich, W. W.</p> <p>1984-05-01</p> <p>It is shown that closure mechanisms alone cannot fully explain increasing fatigue thresholds with decreasing test temperature for a sequence of <span class="hlt">Fe</span>-Si binary alloys and an HSLA steel. Implications are that fatigue crack propagation near threshold is a thermally activated process. The effective threshold stress intensity, which was obtained by subtracting the closure portion from the fatigue threshold, was examined. This effective stress intensity was found to correlate very well to the thermal component of the flow stress. A detailed fractographic study of the fatigue surface was performed. Water vapor in the room air was found to promote the formation of oxide and intergranular crack growth. At lower temperature, a brittle-type cyclic cleavage fatigue surface was observed but the ductile process persisted even at 123 K. Arrest marks were found on all three modes of fatigue crack growth. The regular spacings between these lines and dislocation <span class="hlt">modeling</span> suggested that fatigue crack growth was controlled by the subcell structure near threshold. A <span class="hlt">model</span> based on the slip-off of dislocations was examined. From this, it is shown that the effective fatigue threshold may be related to the square root of (one plus the strain rate sensitivity).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016APS..MAR.T1230A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016APS..MAR.T1230A"><span>Tunnel Magneto Resistance of <span class="hlt">Fe/Insulator/Fe</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Aryee, Dennis; Seifu, Dereje</p> <p></p> <p>Tri-layer thin films of <span class="hlt">Fe/Insulator/Fe</span> were synthesized using magnetron DC/ RF sputtering with MgO insulator and Bi2Te3 topological insulators as middle buffer layer. The multi-layered samples thus produced were studied using in-house built magneto-optic Kerr effect (MOKE) instrument, vibrating sample magnetometer (VSM), torque magnetometer (TMM), AFM, MFM, and magneto-resistance (MR). This system, that is <span class="hlt">Fe/Insulator/Fe</span> on MgO(100) substrate, is a well-known tunnel magneto resistance (TMR) structure often used in magnetic tunnel junction (MTJ) devices. TMR effect is a method by which MTJs are used in developing magneto-resistive random access memory (MRAM), magnetic sensors, and novel logic devices. The main purpose behind this research is to measure the magnetic anisotropy of <span class="hlt">Fe</span>/Insulator /<span class="hlt">Fe</span> structure and correlate it to magneto-resistance. In this presentation, we will present results from MOKE, VSM, TMM, AFM, MFM, and MR studies of <span class="hlt">Fe/Insulator/Fe</span> on MgO(100). We would like to acknowledge support by NSF-MRI-DMR-1337339.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://ntrs.nasa.gov/search.jsp?R=19960021384&hterms=solar+intensity+measurement&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D60%26Ntt%3Dsolar%2Bintensity%2Bmeasurement','NASA-TRS'); return false;" href="https://ntrs.nasa.gov/search.jsp?R=19960021384&hterms=solar+intensity+measurement&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D60%26Ntt%3Dsolar%2Bintensity%2Bmeasurement"><span>Demonstrating the limitations of line ratio temperature diagnostic using <span class="hlt">Fe</span> X and <span class="hlt">Fe</span> XIV spectral line intensity observations</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Brickhouse, Nancy; Esser, Ruth; Habbal, Shadia R.</p> <p>1995-01-01</p> <p>The electron temperature in the inner corona can be derived from spectral line intensity measurements by comparing the ratio of the measured intensities of two spectral lines to the ratio calculated from theoretical <span class="hlt">models</span>. In a homogeneous plasma the line ratio technique can be used for any two lines if the ratio of the intensities is independent of the density. The corona, however, is far from homogeneous. Even large coronal holes present at the solar poles at solar minimum can be <span class="hlt">partly</span> or completely obscured by emission from hotter and denser surrounding regions. In this paper we investigate the effect of these surrounding regions on coronal hole temperatures. using daily intensity measurements at 1.15 Rs of the <span class="hlt">Fe</span> XIV 5303 A and <span class="hlt">Fe</span> X 6374 A spectral lines carried out at the National Solar Observatory at Sacramento Peak. We show that the temperatures derived using the line ratio technique for these two spectral lines can vary by more than 0.8 x 10(exp 6) K due to the contribution from surrounding regions. This example demonstrates the inadequacy of spectral lines with widely separate peak temperatures for temperature diagnostic.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017MNRAS.468.4311L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017MNRAS.468.4311L"><span>Non-LTE line formation of <span class="hlt">Fe</span> in late-type stars - IV. <span class="hlt">Modelling</span> of the solar centre-to-limb variation in 3D</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Lind, K.; Amarsi, A. M.; Asplund, M.; Barklem, P. S.; Bautista, M.; Bergemann, M.; Collet, R.; Kiselman, D.; Leenaarts, J.; Pereira, T. M. D.</p> <p>2017-07-01</p> <p>Our ability to <span class="hlt">model</span> the shapes and strengths of iron lines in the solar spectrum is a critical test of the accuracy of the solar iron abundance, which sets the absolute zero-point of all stellar metallicities. We use an extensive 463-level <span class="hlt">Fe</span> atom with new photoionization cross-sections for <span class="hlt">Fe</span> I and quantum mechanical calculations of collisional excitation and charge transfer with neutral hydrogen; the latter effectively remove a free parameter that has hampered all previous line formation studies of <span class="hlt">Fe</span> in non-local thermodynamic equilibrium (NLTE). For the first time, we use realistic 3D NLTE calculations of <span class="hlt">Fe</span> for a quantitative comparison to solar observations. We confront our theoretical line profiles with observations taken at different viewing angles across the solar disc with the Swedish 1-m Solar Telescope. We find that 3D <span class="hlt">modelling</span> well reproduces the observed centre-to-limb behaviour of spectral lines overall, but highlight aspects that may require further work, especially cross-sections for inelastic collisions with electrons. Our inferred solar iron abundance is log (ɛ<span class="hlt">Fe</span>) = 7.48 ± 0.04 dex.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/1434659-modeling-adsorbate-coverage-distribution-over-multi-faceted-catalytic-grain-presence-electric-field-fe-from-first-principles','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/1434659-modeling-adsorbate-coverage-distribution-over-multi-faceted-catalytic-grain-presence-electric-field-fe-from-first-principles"><span><span class="hlt">Modeling</span> the Adsorbate Coverage Distribution Over a Multi-Faceted Catalytic Grain in the Presence of an Electric Field: O/<span class="hlt">Fe</span> from First Principles</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Bray, Jacob; Hensley, Alyssa J. R.; Collinge, Greg</p> <p></p> <p>The impact of an external electric field on the concerted behavior of oxygen over a multi-faceted catalytic <span class="hlt">Fe</span> grain is determined via the interpolation of ab initio <span class="hlt">models</span> of oxygen adsorption on <span class="hlt">Fe</span>(100), <span class="hlt">Fe</span>(110), and <span class="hlt">Fe</span>(111) in the presence of an external electric field. The application of both negative and positive electric fields weaken the adsorption strength for oxygen on all three surface facets, with <span class="hlt">Fe</span>(110) experiencing the greatest effect. Kinetic <span class="hlt">models</span> of a multi-faceted catalytic <span class="hlt">Fe</span> grain show that the average oxygen coverage over the grain surface is reduced under the influence of both a negative and positive electricmore » field, which are consistent with phase diagram results at comparable pressures. Furthermore, we show that there is a weak synergistic effect between a Pd promoter and a positive electric field on the oxygen adsorption energy, i.e. the Pd promoter and electric field combination weaken the oxygen adsorption energy to a greater degree than the simple addition of both components separately. In conclusion, the work shows that the application of an applied external electric field may be a useful tool in fine-tuning chemical properties of <span class="hlt">Fe</span>-based catalysts in hydrodeoxygenation applications.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1434659-modeling-adsorbate-coverage-distribution-over-multi-faceted-catalytic-grain-presence-electric-field-fe-from-first-principles','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1434659-modeling-adsorbate-coverage-distribution-over-multi-faceted-catalytic-grain-presence-electric-field-fe-from-first-principles"><span><span class="hlt">Modeling</span> the Adsorbate Coverage Distribution Over a Multi-Faceted Catalytic Grain in the Presence of an Electric Field: O/<span class="hlt">Fe</span> from First Principles</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Bray, Jacob; Hensley, Alyssa J. R.; Collinge, Greg; ...</p> <p>2018-04-15</p> <p>The impact of an external electric field on the concerted behavior of oxygen over a multi-faceted catalytic <span class="hlt">Fe</span> grain is determined via the interpolation of ab initio <span class="hlt">models</span> of oxygen adsorption on <span class="hlt">Fe</span>(100), <span class="hlt">Fe</span>(110), and <span class="hlt">Fe</span>(111) in the presence of an external electric field. The application of both negative and positive electric fields weaken the adsorption strength for oxygen on all three surface facets, with <span class="hlt">Fe</span>(110) experiencing the greatest effect. Kinetic <span class="hlt">models</span> of a multi-faceted catalytic <span class="hlt">Fe</span> grain show that the average oxygen coverage over the grain surface is reduced under the influence of both a negative and positive electricmore » field, which are consistent with phase diagram results at comparable pressures. Furthermore, we show that there is a weak synergistic effect between a Pd promoter and a positive electric field on the oxygen adsorption energy, i.e. the Pd promoter and electric field combination weaken the oxygen adsorption energy to a greater degree than the simple addition of both components separately. In conclusion, the work shows that the application of an applied external electric field may be a useful tool in fine-tuning chemical properties of <span class="hlt">Fe</span>-based catalysts in hydrodeoxygenation applications.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2840173','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2840173"><span>A <span class="hlt">model</span> for the CO-inhibited form of [Ni<span class="hlt">Fe</span>] hydrogenase: synthesis of (CO)3<span class="hlt">Fe</span>(μ-StBu)3Ni{SC6H3-2,6-(mesityl)2} and reversible CO addition at the Ni site</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Ohki, Yasuhiro; Yasumura, Kazunari; Ando, Masaru; Shimokata, Satoko; Tatsumi, Kazuyuki</p> <p>2010-01-01</p> <p>A [Ni<span class="hlt">Fe</span>] hydrogenase <span class="hlt">model</span> compound having a distorted trigonal-pyramidal nickel center, (CO)3<span class="hlt">Fe</span>(μ-StBu)3Ni(SDmp), 1 (Dmp = C6H3-2,6-(mesityl)2), was synthesized from the reaction of the tetranuclear <span class="hlt">Fe-Ni-Ni-Fe</span> complex [(CO)3<span class="hlt">Fe</span>(μ-StBu)3Ni]2(μ-Br)2, 2 with NaSDmp at -40 °C. The nickel site of complex 1 was found to add CO or CNtBu at -40 °C to give (CO)3<span class="hlt">Fe</span>(StBu)(μ-StBu)2Ni(CO)(SDmp), 3, or (CO)3<span class="hlt">Fe</span>(StBu)(μ-StBu)2Ni(CNtBu)(SDmp), 4, respectively. One of the CO bands of 3, appearing at 2055 cm-1 in the infrared spectrum, was assigned as the Ni-CO band, and this frequency is comparable to those observed for the CO-inhibited forms of [Ni<span class="hlt">Fe</span>] hydrogenase. Like the CO-inhibited forms of [Ni<span class="hlt">Fe</span>] hydrogenase, the coordination of CO at the nickel site of 1 is reversible, while the CNtBu adduct 4 is more robust. PMID:20147622</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016AGUFMSA42A..05C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016AGUFMSA42A..05C"><span>Thermosphere-Ionosphere <span class="hlt">Fe/Fe</span>+ (TIFe) Layers and Their Coupling with Geomagnetic Storms and Solar Wind</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Chu, X.; Xu, Z.; Zhao, J.; Yu, Z.; Knipp, D. J.; Kilcommons, L. M.; Chen, C.; Fong, W.; Barry, I. F.; Hartinger, M.</p> <p>2016-12-01</p> <p>The discovery of thermospheric neutral <span class="hlt">Fe</span> layers by lidar observations in Antarctica has opened a new door to explore the space-atmosphere interactions with ground-based instruments, especially in the least understood but crucially important altitude range of 100-200 km. These neutral metal layers provide excellent tracers for modern resonance lidars to measure the neutral wind and temperature directly, complementing the radar measurements of the ionosphere and the magnetometer measurements of the geomagnetic field. Even more exciting, the neutral metal layers in the thermosphere provide a natural laboratory to test our fundamental understandings of the atmosphere-ionosphere-magnetosphere (AIM) coupling and processes. The stunning <span class="hlt">Fe</span> layer event on 28 May 2011 with clear gravity wave signatures has been simulated successfully with the University of Colorado Thermosphere-Ionosphere <span class="hlt">Fe/Fe</span>+ (TIFe) <span class="hlt">model</span>, confirming the theoretical hypothesis that such thermospheric <span class="hlt">Fe</span> layers are produced through the neutralization of converged <span class="hlt">Fe</span>+layers. Over 5.5 years of lidar observations at McMurdo have revealed many more cases with variety of patterns - besides the `gravity wave' patterns, there are `diffusive' patterns with both upward and downward phase progressions of <span class="hlt">Fe</span> layers, and `superposition' patterns with both gravity wave signature and diffusive background. Surprisingly, these <span class="hlt">Fe</span> layer events exhibit close correlations with geomagnetic storms. They also correspond to remarkable activity of extreme solar wind events, e.g., high-speed stream (HSS) and coronal mass ejection (CME), etc. This paper conducts a systematic investigation of the coupling among TIFe layers, geomagnetic storms, solar wind and IMF via combining ground-based lidar, magnetometer, and SuperDARN data with DMSP, ACE and WIND satellite data along with the TIFe <span class="hlt">model</span> simulations. We aim to quantitatively determine the relationship between TIFe and magnetic storms, and explore the mechanisms responsible for</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26488283','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26488283"><span>How Is <span class="hlt">Fe</span>-S Cluster Formation Regulated?</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Mettert, Erin L; Kiley, Patricia J</p> <p>2015-01-01</p> <p>Iron-sulfur (<span class="hlt">Fe</span>-S) clusters are fundamental to numerous biological processes in most organisms, but these protein cofactors can be prone to damage by various oxidants (e.g., O2, reactive oxygen species, and reactive nitrogen species) and toxic levels of certain metals (e.g., cobalt and copper). Furthermore, their synthesis can also be directly influenced by the level of available iron in the environment. Consequently, the cellular need for <span class="hlt">Fe</span>-S cluster biogenesis varies with fluctuating growth conditions. To accommodate changes in <span class="hlt">Fe</span>-S demand, microorganisms employ diverse regulatory strategies to tailor <span class="hlt">Fe</span>-S cluster biogenesis according to their surroundings. Here, we review the mechanisms that regulate <span class="hlt">Fe</span>-S cluster formation in bacteria, primarily focusing on control of the Isc and Suf <span class="hlt">Fe</span>-S cluster biogenesis systems in the <span class="hlt">model</span> bacterium Escherichia coli.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016AGUOSCT11A..04C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016AGUOSCT11A..04C"><span>Tracing anthropogenic aerosol <span class="hlt">Fe</span> sources in the North Atlantic Ocean using dissolved <span class="hlt">Fe</span> isotope ratios</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Conway, T. M.; Shelley, R.; Aguilar-Islas, A. M.; Landing, W. M.; Mahowald, N. M.; John, S.</p> <p>2016-02-01</p> <p>Supply of iron (<span class="hlt">Fe</span>) to the surface ocean from atmospheric deposition plays a vital role in marine biogeochemical cycles, especially in <span class="hlt">Fe</span>-limited areas or regions close to dust sources. However, large uncertainties remain over the fluxes, solubility and bioavailability of <span class="hlt">Fe</span> supplied by aerosol dust. Additionally, aerosol <span class="hlt">Fe</span> is likely to consist of a mixture of natural and anthropogenic (urban, biomass burning and combustion) components, which may have very different solubilities in seawater [e.g. 1]. To constrain soluble <span class="hlt">Fe</span> supply to the oceans, it is thus vitally important to understand the relative contributions of different types of aerosol <span class="hlt">Fe</span>, their solubilities and spatial distributions. Stable <span class="hlt">Fe</span> isotopes (δ56<span class="hlt">Fe</span>) may offer a way to discriminate between different dust sources [2], because of differential fractionation during a range of chemical processes. In this study, we measured δ56<span class="hlt">Fe</span> in North Atlantic marine aerosols collected during two US GEOTRACES GA03 cruises (Lisbon to Woods Hole via Cape Verde, 2010-11) and we present δ56<span class="hlt">Fe</span> measurements (relative to IRMM-014) from both the bulk aerosol (HF-HNO3 digested) and the water-soluble (10s ultrapure water leach) fractions. Aerosols collected from different air-masses (Saharan, European and N. American) allowed us to investigate the variability in δ56<span class="hlt">Fe</span> due to different regional dust sources. The bulk phase was characterized by near-crustal δ56<span class="hlt">Fe</span> values of +0.1±0.2‰, indicating the dominance of mineral dust. In contrast, the water-soluble fraction showed great variability; aerosols from European and North American air-masses were very isotopically light (-1.2±0.2‰ and -1.1±0.7‰) while those from Saharan air-masses were crustal (+0.1‰). Comparison of this data with isotope-informed <span class="hlt">model</span> predictions of soluble <span class="hlt">Fe</span> from mineral and anthropogenic sources (combustion, biofuels and biomass burning) [1], suggests that the data is consistent with mixing of either 1) <span class="hlt">Fe</span> from mineral dust (+0.1‰) and</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2008APS..MARS32004H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2008APS..MARS32004H"><span>Transport and spin transfer torques in <span class="hlt">Fe/MgO/Fe</span> tunnel barriers.</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Heiliger, Christian</p> <p>2008-03-01</p> <p>The prediction of very high tunneling magnetoresistance (TMR) ratios in crystalline <span class="hlt">Fe/MgO/Fe</span> [1,2] tunnel junctions has been verified by a number of experiments [3,4]. The high TMR can be understood in terms of the electronic structure of the system. In MgO the δ1 states at the Brillouin zone center decay the most slowly and dominate the tunnelling current. For coherent interfaces, which are achievable due to the small lattice mismatch between <span class="hlt">Fe</span> and MgO, these δ1 states at the Brillouin zone center are half-metallic in the <span class="hlt">Fe</span> layers. The dominance of the δ1 states and their half-metallicity cause the high tunnelling magnetoresistance measured in <span class="hlt">Fe/MgO/Fe</span> tunnel junctions [5]. For the spin transfer torque, we calculate the linear response for small currents and voltages. Our calculations show that the half metallicity of the <span class="hlt">Fe</span> δ1 states leads to a strong localization of the spin transfer torque to the interface. As a result, the linear current dependence of the torque in the plane of the two magnetizations is independent of the free layer thickness for more than three monolayers of <span class="hlt">Fe</span>. For perfect samples we also find a linear current dependence of the out-of-plane component. However, this linear piece oscillates rapidly with thickness and averages to zero in the presence of structural imperfections like thickness fluctuation, in agreement with experiment [6]. In this talk I discuss the bias dependence of the TMR and spin transfer torque effects mentioned above and the influence on them of the following factors: the interface structure <span class="hlt">Fe</span>/MgO, the barrier thickness, and the structure of the leads [7]. This work has been supported in <span class="hlt">part</span> by the NIST-CNST/UMD-NanoCenter Cooperative Agreement. [1] W. Butler, X.-G. Zhang, T. Schulthess, J. MacLaren, Phys. Rev. B 63 (2001) 054416. [2] J. Mathon, A. Umerski, Phys. Rev. B 63 (2001) 220403. [3] S. Yuasa, T. Nagahama, A. Fukushima, Y. Suzuki, K. Ando, Nature Materials 3 (2004) 868. [4] S.S.P. Parkin, C. Kaiser, A</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017MS%26E..188a2014F','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017MS%26E..188a2014F"><span>Role of temperature-dependent O-p-<span class="hlt">Fe</span>-d hybridization parameter in the metal-insulator transition of <span class="hlt">Fe</span>3O4: a theoretical study</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Fauzi, A. D.; Majidi, M. A.; Rusydi, A.</p> <p>2017-04-01</p> <p>We propose a simple tight-binding based <span class="hlt">model</span> for <span class="hlt">Fe</span>3O4 that captures the preference of ferrimagnetic over ferromagnetic spin configuration of the system. Our <span class="hlt">model</span> is consistent with previous theoretical and experimental studies suggesting that the system is half metallic, in which spin polarized electrons hop only among the <span class="hlt">Fe</span> B sites. To address the metal-insulator transition (MIT) we propose that the strong correlation among electrons, which may also be influenced by the electron-phonon interactions, manifest as the temperature-dependence of the O-p-<span class="hlt">Fe</span>-d hybridization parameter, particularly <span class="hlt">Fe</span>-d belonging to one of the <span class="hlt">Fe</span> B sites (denoted as {t}{{<span class="hlt">Fe</span>B}-{{O}}}(2)). By proposing that this parameter increases as the temperature decreases, our density-of-states calculation successfully captures a gap opening at the Fermi level, transforming the system from half metal to insulator. Within this <span class="hlt">model</span> along with the corresponding choice of parameters and a certain profile of the temperature dependence of {t}{{<span class="hlt">Fe</span>B}-{{O}}}(2), we calculate the resistivity of the system as a function of temperature. Our calculation result reveals the drastic uprising trend of the resistivity profile as the temperature decreases, with the MIT transition temperature located around 100 K, which is in agreement with experimental data.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2014-title17-vol1/pdf/CFR-2014-title17-vol1-part4-appC.pdf','CFR2014'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2014-title17-vol1/pdf/CFR-2014-title17-vol1-part4-appC.pdf"><span>17 CFR Appendix C to <span class="hlt">Part</span> 4 - Form CTA-PR</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-04-01</p> <p>... 17 Commodity and Securities Exchanges 1 2014-04-01 2014-04-01 false Form CTA-PR C Appendix C to <span class="hlt">Part</span> 4 Commodity and Securities Exchanges COMMODITY FUTURES TRADING COMMISSION COMMODITY POOL OPERATORS AND COMMODITY TRADING ADVISORS Pt. 4, App. C Appendix C to <span class="hlt">Part</span> 4—Form CTA-PR ER24<span class="hlt">FE</span>12.052 ER24<span class="hlt">FE</span>12...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.dtic.mil/docs/citations/ADP012219','DTIC-ST'); return false;" href="http://www.dtic.mil/docs/citations/ADP012219"><span>Nanocomposite Electrodes for Advanced Lithium Batteries: The Li<span class="hlt">Fe</span>PO4 Cathode</span></a></p> <p><a target="_blank" href="http://www.dtic.mil/">DTIC Science & Technology</a></p> <p></p> <p>2001-11-01</p> <p>The Li<span class="hlt">Fe</span>PO4 Cathode DISTRIBUTION: Approved for public release, distribution unlimited This paper is <span class="hlt">part</span> of the following report: TITLE: Nanophase and...Nanocomposite Electrodes for Advanced Lithium Batteries: The Li<span class="hlt">Fe</span>PO4 Cathode Shoufeng Yang, Yanning Song, Peter Y. Zavalij and M. Stanley Whittingham...Institute for Materials Research, Binghamton University, Binghamton, NY 13902-1600, U.S.A. ABSTRACT Li<span class="hlt">Fe</span>PO4 was successfully synthesized by high temperature</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1210133-thermal-stability-intermetallic-phases-fe-rich-fe-cr-ni-mo-alloys','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1210133-thermal-stability-intermetallic-phases-fe-rich-fe-cr-ni-mo-alloys"><span>Thermal stability of intermetallic phases in <span class="hlt">Fe</span>-rich <span class="hlt">Fe</span>-Cr-Ni-Mo alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Yang, Ying; Tan, Lizhen; Busby, Jeremy T.</p> <p>2015-06-12</p> <p>Understanding the stability of precipitate phases in the <span class="hlt">Fe</span>-rich <span class="hlt">Fe</span>-Cr-Ni-Mo alloys is critical to the alloy design and application of Mo-containing Austenitic steels. Coupled with thermodynamic <span class="hlt">modeling</span>, stability of the chi and Laves phases in two <span class="hlt">Fe</span>-Cr-Ni-Mo alloys were investigated at 1000, 850 and 700 °C for different annealing time. The morphologies, compositions and crystal structures of the matrix and precipitate phases were carefully examined by Scanning Electron Microscopy, Electron Probe Microanalysis, X-ray diffraction and Transmission Electron Microscopy. The two key findings resulted from this work. One is that the chi phase is stable at high temperature and transformed intomore » the Laves phase at low temperature. The other is that both the chi and Laves phases have large solubilites of Cr, Mo and Ni, among which the Mo solubility has a major role on the relative stability of the precipitate phases. The developed thermodynamic <span class="hlt">models</span> were then applied to evaluating the Mo effect on the stability of precipitate phases in AISI 316 and NF709 alloys.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018PhRvB..97n4105G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018PhRvB..97n4105G"><span>Crystal-melt interface mobility in bcc <span class="hlt">Fe</span>: Linking molecular dynamics to phase-field and phase-field crystal <span class="hlt">modeling</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Guerdane, M.; Berghoff, M.</p> <p>2018-04-01</p> <p>By combining molecular dynamics (MD) simulations with phase-field (PF) and phase-field crystal (PFC) <span class="hlt">modeling</span> we study collision-controlled growth kinetics from the melt for pure <span class="hlt">Fe</span>. The MD/PF comparison shows, on the one hand, that the PF <span class="hlt">model</span> can be properly designed to reproduce quantitatively different aspects of the growth kinetics and anisotropy of planar and curved solid-liquid interfaces. On the other hand, this comparison demonstrates the ability of classical MD simulations to predict morphology and dynamics of moving curved interfaces up to a length scale of about 0.15 μ m . After mapping the MD <span class="hlt">model</span> to the PF one, the latter permits to analyze the separate contribution of different anisotropies to the interface morphology. The MD/PFC agreement regarding the growth anisotropy and morphology extends the trend already observed for the here used PFC <span class="hlt">model</span> in describing structural and elastic properties of bcc <span class="hlt">Fe</span>.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/servlets/purl/1376519','SCIGOV-STC'); return false;" href="https://www.osti.gov/servlets/purl/1376519"><span>Strong 3D and 1D magnetism in hexagonal <span class="hlt">Fe</span>-chalcogenides <span class="hlt">Fe</span>S and <span class="hlt">Fe</span>Se vs. weak magnetism in hexagonal <span class="hlt">Fe</span>Te</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Parker, David S.</p> <p>2017-06-13</p> <p>We present a comparative theoretical study of the hexagonal forms of the <span class="hlt">Fe</span>-chalcogenides <span class="hlt">Fe</span>S, <span class="hlt">Fe</span>Se and <span class="hlt">Fe</span>Te with their better known tetragonal forms. While the tetragonal forms exhibit only an incipient antiferromagnetism and experimentally show superconductivity when doped, the hexagonal forms of <span class="hlt">Fe</span>S and <span class="hlt">Fe</span>Se display a robust magnetism. We show that this strong magnetism arises from a van Hove singularity associated with the direct <span class="hlt">Fe-Fe</span> c-axis chains in the generally more three-dimensional NiAs structure. We also find that hexagonal <span class="hlt">Fe</span>Te is much less magnetic than the other two hexagonal materials, so that unconventional magnetically-mediated superconductivity is possible, although amore » large T c value is unlikely.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5978242','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5978242"><span>Removal of Crystal Violet by Using Reduced-Graphene-Oxide-Supported Bimetallic <span class="hlt">Fe</span>/Ni Nanoparticles (rGO/<span class="hlt">Fe</span>/Ni): Application of Artificial Intelligence <span class="hlt">Modeling</span> for the Optimization Process</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Ruan, Wenqian; Qi, Jimei; Hou, Yu; Cao, Rensheng; Wei, Xionghui</p> <p>2018-01-01</p> <p>Reduced-graphene-oxide-supported bimetallic <span class="hlt">Fe</span>/Ni nanoparticles were synthesized in this study for the removal of crystal violet (CV) dye from aqueous solutions. This material was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS), Raman spectroscopy, N2-sorption, and X-ray photoelectron spectroscopy (XPS). The influence of independent parameters (namely, initial dye concentration, initial pH, contact time, and temperature) on the removal efficiency were investigated via Box–Behnken design (BBD). Artificial intelligence (i.e., artificial neural network, genetic algorithm, and particle swarm optimization) was used to optimize and predict the optimum conditions and obtain the maximum removal efficiency. The zero point of charge (pHZPC) of rGO/<span class="hlt">Fe</span>/Ni composites was determined by using the salt addition method. The experimental equilibrium data were fitted well to the Freundlich <span class="hlt">model</span> for the evaluation of the actual behavior of CV adsorption, and the maximum adsorption capacity was estimated as 2000.00 mg/g. The kinetic study discloses that the adsorption processes can be satisfactorily described by the pseudo-second-order <span class="hlt">model</span>. The values of Gibbs free energy change (ΔG0), entropy change (ΔS0), and enthalpy change (ΔH0) demonstrate the spontaneous and endothermic nature of the adsorption of CV onto rGO/<span class="hlt">Fe</span>/Ni composites. PMID:29789483</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/29789483','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/29789483"><span>Removal of Crystal Violet by Using Reduced-Graphene-Oxide-Supported Bimetallic <span class="hlt">Fe</span>/Ni Nanoparticles (rGO/<span class="hlt">Fe</span>/Ni): Application of Artificial Intelligence <span class="hlt">Modeling</span> for the Optimization Process.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Ruan, Wenqian; Hu, Jiwei; Qi, Jimei; Hou, Yu; Cao, Rensheng; Wei, Xionghui</p> <p>2018-05-22</p> <p>Reduced-graphene-oxide-supported bimetallic <span class="hlt">Fe</span>/Ni nanoparticles were synthesized in this study for the removal of crystal violet (CV) dye from aqueous solutions. This material was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS), Raman spectroscopy, N₂-sorption, and X-ray photoelectron spectroscopy (XPS). The influence of independent parameters (namely, initial dye concentration, initial pH, contact time, and temperature) on the removal efficiency were investigated via Box⁻Behnken design (BBD). Artificial intelligence (i.e., artificial neural network, genetic algorithm, and particle swarm optimization) was used to optimize and predict the optimum conditions and obtain the maximum removal efficiency. The zero point of charge (pH ZPC ) of rGO/<span class="hlt">Fe</span>/Ni composites was determined by using the salt addition method. The experimental equilibrium data were fitted well to the Freundlich <span class="hlt">model</span> for the evaluation of the actual behavior of CV adsorption, and the maximum adsorption capacity was estimated as 2000.00 mg/g. The kinetic study discloses that the adsorption processes can be satisfactorily described by the pseudo-second-order <span class="hlt">model</span>. The values of Gibbs free energy change (Δ G ⁰), entropy change (Δ S ⁰), and enthalpy change (Δ H ⁰) demonstrate the spontaneous and endothermic nature of the adsorption of CV onto rGO/<span class="hlt">Fe</span>/Ni composites.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_10");'>10</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li class="active"><span>12</span></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_12 --> <div id="page_13" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li class="active"><span>13</span></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="241"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2006AGUFM.V13E..02W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2006AGUFM.V13E..02W"><span>Tracing mantle processes with <span class="hlt">Fe</span> isotopes</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Weyer, S.; Ionov, D.</p> <p>2006-12-01</p> <p>High precision <span class="hlt">Fe</span> isotope measurements have been performed on various mantle peridotites (fertile lherzolites, harzburgites, metasomatised <span class="hlt">Fe</span>-enriched rocks) and volcanic rocks (mainly oceanic basalts) from different localities and tectonic settings. Pimitive peridotites (Mg# = 0.894) yield delta56<span class="hlt">Fe</span> = 0.02 and are significantly lighter than the basalts (average delta56<span class="hlt">Fe</span> = 0.11). Furthermore, the peridotites display a negative correlation of iron isotopes with Mg#. Taken together, these findings imply that <span class="hlt">Fe</span> isotopes fractionate during partial melting, with heavy isotopes preferentially entering the melt [1, 2]. A particularly good correlation of the <span class="hlt">Fe</span> isotope composition and Mg# shown by poorly metasomatised spinel lherzolites of three localities (Horoman, Kamchatka and Lherz) was used to <span class="hlt">model</span> <span class="hlt">Fe</span> isotope fractionation during partial melting, resulting in alphamantle-melt = 1.0003. This value implies higher <span class="hlt">Fe</span> isotope fractionation between residual mantle and mantle-derived melts (i.e. Delta56Femantle-melt = 0.2-0.3) than the observed difference between the peridotites and the basalts in this study. Our data on plagioclase lherzolites from Horoman and spinel lherzolites from other localities indicate that the difference in <span class="hlt">Fe</span> isotope composition between mantle and basalts may be reduced by partial re-equilibration between the isotopically heavy basalts and the isotopically light depleted lithospheric mantle during melt ascent. Besides partial melting, the <span class="hlt">Fe</span> isotope composition of mantle peridotites can also be significantly modified by metasomatic events. At two localities (Tok, Siberia and Tariat, Mongolia) <span class="hlt">Fe</span> isotopes correlates with the <span class="hlt">Fe</span> concentration of the peridotites, which was increased up to 14.5% <span class="hlt">Fe</span>O by melt percolation. Such processes can be accompanied by chromatographic effects and produce a range of <span class="hlt">Fe</span> isotope compositions in the percolation columns, from extremely light to heavy (delta56<span class="hlt">Fe</span> = -0.42 to +0.17). We propose that <span class="hlt">Fe</span> isotopes can be</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.ars.usda.gov/research/publications/publication/?seqNo115=268749','TEKTRAN'); return false;" href="http://www.ars.usda.gov/research/publications/publication/?seqNo115=268749"><span>Influence of <span class="hlt">Fe</span>EDDS, <span class="hlt">Fe</span>EDTA, <span class="hlt">Fe</span>DTPA, <span class="hlt">Fe</span>EDDHA, and <span class="hlt">Fe</span>SO4 on Marigold Growth and Nutrition, and Substrate and Runoff Chemistry</span></a></p> <p><a target="_blank" href="https://www.ars.usda.gov/research/publications/find-a-publication/">USDA-ARS?s Scientific Manuscript database</a></p> <p></p> <p></p> <p>Objectives of the study were to determine effects of <span class="hlt">Fe</span> source on plant growth, plant nutrition, substrate chemistry and runoff chemistry. Iron source (FS) treatments consisted of <span class="hlt">Fe</span>-aminopolycarboxylic acid (APCA) complexones iron ethylenediaminetetraacetic acid (<span class="hlt">Fe</span>EDTA), iron [S, S']-ethylenediam...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1993AAS...182.4701H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1993AAS...182.4701H"><span>NLTE Line Blanketed <span class="hlt">Model</span> Atmospheres for Hot, Metal-rich White Dwarfs</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hubeny, I.; Lanz, T.</p> <p>1993-05-01</p> <p>Recent observations of some hot DA white dwarfs (Feige 24, G191 B2B - Sion et al. 1992, Ap.J. 391, L29; Vennes et al. 1992, Ap.J. 392, L27) and subsequent analyses have demonstrated that their atmospheres are contaminated with heavy metal species with appreciable abundances. So far, <span class="hlt">modeling</span> was mostly limited to calculating synthetic spectra (usually in LTE), based on previously calculated <span class="hlt">model</span> atmospheres that were constructed assuming a simplified chemical composition. However, in reality the metal lines may also significantly influence the temperature structure, and consequently the ionization balance of some important species. Since the effective temperature is rather high (55000 to 60000 K), the NLTE effects may be important despite the high gravity. Therefore, in order to settle the question on metal abundances of hot DA white dwarfs, we need to calculate NLTE fully line blanketed <span class="hlt">model</span> atmospheres. Using our previously developed hybrid complete linearization/accelerated lambda iteration method, we have calculated a set of NLTE <span class="hlt">models</span> including H, He, C, N, O, and <span class="hlt">Fe</span>, with some 13000 lines of <span class="hlt">Fe</span> IV, <span class="hlt">Fe</span> V and <span class="hlt">Fe</span> VI taken into account explicitly in <span class="hlt">model</span> construction. The NLTE departure coefficients for all levels of <span class="hlt">Fe</span> IV, <span class="hlt">Fe</span> V, and <span class="hlt">Fe</span> VI are then employed in the spectrum synthesis program SYNSPEC. In the first <span class="hlt">part</span> of this study, we present a theoretical comparison between <span class="hlt">models</span> computed with adding more and more opacity sources, and show how the temperature structure and synthetic spectra develop. We also discuss possible errors arising from using an inconsistent spectrum synthesis (the metals considered only in the spectrum synthesis, not in the <span class="hlt">model</span> construction). In the second <span class="hlt">part</span>, we compare the computed UV spectra with with available observations of Feige 24 and G191 B2B, and deduce limits for the iron abundance of these stars.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://pubs.er.usgs.gov/publication/70185175','USGSPUBS'); return false;" href="https://pubs.er.usgs.gov/publication/70185175"><span>Mechanisms for <span class="hlt">Fe</span>(III) oxide reduction in sedimentary environments</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Nevin, Kelly P.; Lovely, Derek R.</p> <p>2002-01-01</p> <p>Although it was previously considered that <span class="hlt">Fe</span>(III)-reducing microorganisms must come into direct contact with <span class="hlt">Fe</span>(III) oxides in order to reduce them, recent studies have suggested that electron-shuttling compounds and/or <span class="hlt">Fe</span>(III) chelators, either naturally present or produced by the <span class="hlt">Fe</span>(III)-reducing microorganisms themselves, may alleviate the need for the <span class="hlt">Fe</span>(III) reducers to establish direct contact with <span class="hlt">Fe</span>(III) oxides. Studies with Shewanella alga strain BrY and <span class="hlt">Fe</span>(III) oxides sequestered within microporous beads demonstrated for the first time that this organism releases a compound(s) that permits electron transfer to <span class="hlt">Fe</span>(III) oxides which the organism cannot directly contact. Furthermore, as much as 450 w M dissolved <span class="hlt">Fe</span>(III) was detected in cultures of S. alga growing in <span class="hlt">Fe</span>(III) oxide medium, suggesting that this organism releases compounds that can solublize <span class="hlt">Fe</span>(III) from <span class="hlt">Fe</span>(III) oxide. These results contrast with previous studies, which demonstrated that Geobacter metallireducens does not produce electron-shuttles or <span class="hlt">Fe</span>(III) chelators. Some freshwater aquatic sediments and groundwaters contained compounds, which could act as electron shuttles by accepting electrons from G. metallireducens and then transferring the electrons to <span class="hlt">Fe</span>(III). However, other samples lacked significant electron-shuttling capacity. Spectroscopic studies indicated that the electron-shuttling capacity of the waters was not only associated with the presence of humic substances, but water extracts of walnut, oak, and maple leaves contained electron-shuttling compounds did not appear to be humic substances. Porewater from a freshwater aquatic sediment and groundwater from a petroleum-contaminated aquifer contained dissolved <span class="hlt">Fe</span>(III) (4-16 w M), suggesting that soluble <span class="hlt">Fe</span>(III) may be available as an electron acceptor in some sedimentary environments. These results demonstrate that in order to accurately <span class="hlt">model</span> the mechanisms for <span class="hlt">Fe</span>(III) reduction in sedimentary environments it will be necessary</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1998SurSc.402..609H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1998SurSc.402..609H"><span>Auger electron diffraction study of V/<span class="hlt">Fe</span>(100) interface formation</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Huttel, Y.; Avila, J.; Asensio, M. C.; Bencok, P.; Richter, C.; Ilakovac, V.; Heckmann, O.; Hricovini, K.</p> <p>1998-05-01</p> <p>Vanadium atoms present a magnetic moment different to zero when they are <span class="hlt">part</span> of a thin film deposited on <span class="hlt">Fe</span> or as a bimetallic <span class="hlt">Fe</span>-V alloy. The understanding of this phenomenon can only be achieved with a correct structural description of these types of systems. We report an Auger electron diffraction investigation of V films grown on body cubic centred (b.c.c.) <span class="hlt">Fe</span>(100) substrates. Angular-scanned Auger electron diffraction (AED) patterns of V L 23M 23M 4 (473 eV) and <span class="hlt">Fe</span> L 3VV (703 eV) show the formation of a well-ordered V/<span class="hlt">Fe</span> interface even at room temperature. The AED patterns of V films in the range of vanadium submonolayer provide evidence of an isotropic Auger emission, indicating the absence of interdiffusion of V atoms into the <span class="hlt">Fe</span> substrate and absence of cluster growth of the V film. The annealing of these films up to 400°C does not activate the substitution of the topmost <span class="hlt">Fe</span> surface layers by V atoms.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/17354895','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/17354895"><span>A statistical <span class="hlt">parts</span>-based appearance <span class="hlt">model</span> of inter-subject variability.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Toews, Matthew; Collins, D Louis; Arbel, Tal</p> <p>2006-01-01</p> <p>In this article, we present a general statistical <span class="hlt">parts</span>-based <span class="hlt">model</span> for representing the appearance of an image set, applied to the problem of inter-subject MR brain image matching. In contrast with global image representations such as active appearance <span class="hlt">models</span>, the <span class="hlt">parts</span>-based <span class="hlt">model</span> consists of a collection of localized image <span class="hlt">parts</span> whose appearance, geometry and occurrence frequency are quantified statistically. The <span class="hlt">parts</span>-based approach explicitly addresses the case where one-to-one correspondence does not exist between subjects due to anatomical differences, as <span class="hlt">parts</span> are not expected to occur in all subjects. The <span class="hlt">model</span> can be learned automatically, discovering structures that appear with statistical regularity in a large set of subject images, and can be robustly fit to new images, all in the presence of significant inter-subject variability. As <span class="hlt">parts</span> are derived from generic scale-invariant features, the framework can be applied in a wide variety of image contexts, in order to study the commonality of anatomical <span class="hlt">parts</span> or to group subjects according to the <span class="hlt">parts</span> they share. Experimentation shows that a <span class="hlt">parts</span>-based <span class="hlt">model</span> can be learned from a large set of MR brain images, and used to determine <span class="hlt">parts</span> that are common within the group of subjects. Preliminary results indicate that the <span class="hlt">model</span> can be used to automatically identify distinctive features for inter-subject image registration despite large changes in appearance.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015HTMP...34....1F','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015HTMP...34....1F"><span>A Simple Kinetic <span class="hlt">Model</span> for the Growth of <span class="hlt">Fe</span>2B Layers on AISI 1026 Steel During the Powder-pack Boriding</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Flores-Rentería, M. A.; Ortiz-Domínguez, M.; Keddam, M.; Damián-Mejía, O.; Elias-Espinosa, M.; Flores-González, M. A.; Medina-Moreno, S. A.; Cruz-Avilés, A.; Villanueva-Ibañez, M.</p> <p>2015-02-01</p> <p>This work focused on the determination of boron diffusion coefficient through the <span class="hlt">Fe</span>2B layers on AISI 1026 steel using a mathematical <span class="hlt">model</span>. The suggested <span class="hlt">model</span> solves the mass balance equation at the (<span class="hlt">Fe</span>2B/substrate) interface. This thermochemical treatment was carried out in the temperature range of 1123-1273 K for a treatment time ranging from 2 to 8 h. The generated boride layers were characterized by different experimental techniques such as light optical microscopy, scanning electron microscopy, XRD analysis and the Daimler-Benz Rockwell-C indentation technique. As a result, the boron activation energy for AISI 1026 steel was estimated as 178.4 kJ/mol. Furthermore, this kinetic <span class="hlt">model</span> was validated by comparing the experimental <span class="hlt">Fe</span>2B layer thickness with the predicted one at a temperature of 1253 K for 5 h of treatment. A contour diagram relating the layer thickness to the boriding parameters was proposed to be used in practical applications.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017PhRvB..95r0504K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017PhRvB..95r0504K"><span>Pressure-induced magnetic order in <span class="hlt">Fe</span>Se: A muon spin rotation study</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Khasanov, Rustem; Guguchia, Zurab; Amato, Alex; Morenzoni, Elvezio; Dong, Xiaoli; Zhou, Fang; Zhao, Zhongxian</p> <p>2017-05-01</p> <p>The magnetic order induced by the pressure was studied in <span class="hlt">Fe</span>Se by means of muon spin rotation (μ SR ) technique. By following the evolution of the oscillatory <span class="hlt">part</span> of the μ SR signal as a function of angle between the initial muon spin polarization and 101 axis of the studied <span class="hlt">Fe</span>Se sample, it was found that the pressure-induced magnetic order in <span class="hlt">Fe</span>Se corresponds either to the collinear (single-stripe) antiferromagnetic order as observed in parent compounds of various <span class="hlt">Fe</span>As-based superconductors or to the bi-collinear order as obtained in the <span class="hlt">Fe</span>Te system, but with the <span class="hlt">Fe</span> spins turned by 45o within the a b plane. The value of the magnetic moment per <span class="hlt">Fe</span> atom was estimated to be ≃0.13 -0.14 μB at p ≃1.9 GPa.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/24056856','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/24056856"><span>A novel ascorbic acid sensor based on the <span class="hlt">Fe</span>3+/<span class="hlt">Fe</span>2+ modulated photoluminescence of CdTe quantum dots@SiO2 nanobeads.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Ma, Qiang; Li, Yang; Lin, Zi-Han; Tang, Guangchao; Su, Xing-Guang</p> <p>2013-10-21</p> <p>In this paper, CdTe quantum dot (QD)@silica nanobeads were used as modulated photoluminescence (PL) sensors for the sensing of ascorbic acid in aqueous solution for the first time. The sensor was developed based on the different quenching effects of <span class="hlt">Fe</span>(2+) and <span class="hlt">Fe</span>(3+) on the PL intensity of the CdTe QD@ silica nanobeads. Firstly, the PL intensity of the CdTe QDs was quenched in the presence of <span class="hlt">Fe</span>(3+). Although both <span class="hlt">Fe</span>(2+) and <span class="hlt">Fe</span>(3+) could quench the PL intensity of the CdTe QDs, the quenching efficiency were quite different for <span class="hlt">Fe</span>(2+) and <span class="hlt">Fe</span>(3+). The PL intensity of the CdTe QD@silica nanobeads can be quenched by about 15% after the addition of <span class="hlt">Fe</span>(3+) (60 μmol L(-1)), while the PL intensity of the CdTe QD@silica nanobeads can be quenched about 49% after the addition of <span class="hlt">Fe</span>(2+) (60 μmol L(-1)). Therefore, the PL intensity of the CdTe QD@silica nanobeads decreased significantly when <span class="hlt">Fe</span>(3+) was reduced to <span class="hlt">Fe</span>(2+) by ascorbic acid. To confirm the strategy of PL modulation in this sensing system, trace H2O2 was introduced to oxidize <span class="hlt">Fe</span>(2+) to <span class="hlt">Fe</span>(3+). As a result, the PL intensity of the CdTe QD@silica nanobeads was <span class="hlt">partly</span> recovered. The proposed sensor could be used for ascorbic acid sensing in the concentration range of 3.33-400 μmol L(-1), with a detection limit (3σ) of 1.25 μmol L(-1) The feasibility of the proposed sensor for ascorbic acid determination in tablet samples was also studied, and satisfactory results were obtained.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014EPJA...50...55W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014EPJA...50...55W"><span>Study on the keV neutron capture reaction in 56<span class="hlt">Fe</span> and 57<span class="hlt">Fe</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wang, Taofeng; Lee, Manwoo; Kim, Guinyun; Ro, Tae-Ik; Kang, Yeong-Rok; Igashira, Masayuki; Katabuchi, Tatsuya</p> <p>2014-03-01</p> <p>The neutron capture cross-sections and the radiative capture gamma-ray spectra from the broad resonances of 56<span class="hlt">Fe</span> and 57<span class="hlt">Fe</span> in the neutron energy range from 10 to 90keV and 550keV have been measured with an anti-Compton NaI(Tl) detector. Pulsed keV neutrons were produced from the 7Li 7Be reaction by bombarding the lithium target with the 1.5ns bunched proton beam from the 3MV Pelletron accelerator. The incident neutron spectrum on a capture sample was measured by means of a time-of-flight (TOF) method with a 6Li -glass detector. The number of weighted capture counts of the iron or gold sample was obtained by applying a pulse height weighting technique to the corresponding capture gamma-ray pulse height spectrum. The neutron capture gamma-ray spectra were obtained by unfolding the observed capture gamma-ray pulse height spectra. To achieve further understanding on the mechanism of neutron radiative capture reaction and study on physics <span class="hlt">models</span>, theoretical calculations of the -ray spectra for 56<span class="hlt">Fe</span> and 57<span class="hlt">Fe</span> with the POD program have been performed by applying the Hauser-Feshbach statistical <span class="hlt">model</span>. The dominant ingredients to perform the statistical calculation were the Optical <span class="hlt">Model</span> Potential (OMP), the level densities described by the Mengoni-Nakajima approach, and the -ray transmission coefficients described by -ray strength functions. The comparison of the theoretical calculations, performed only for the 550keV point, show a good agreement with the present experimental results.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018Icar..307..172R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018Icar..307..172R"><span>Top-down freezing in a <span class="hlt">Fe-Fe</span>S core and Ganymede's present-day magnetic field</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Rückriemen, Tina; Breuer, Doris; Spohn, Tilman</p> <p>2018-06-01</p> <p>Ganymede's core most likely possesses an active dynamo today, which produces a magnetic field at the surface of ∼ 719 nT. Thermochemical convection triggered by cooling of the core is a feasible power source for the dynamo. Experiments of different research groups indicate low pressure gradients of the melting temperatures for <span class="hlt">Fe-Fe</span>S core alloys at pressures prevailing in Ganymede's core ( < 10 GPa). This may entail that the core crystallizes from the top instead of from the bottom as is expected for Earth's core. Depending on the core sulfur concentration being more iron- or more sulfur-rich than the eutectic concentration either snowing iron crystals or a solid <span class="hlt">Fe</span>S layer can form at the top of the core. We investigate whether these two core crystallization scenarios are capable of explaining Ganymede's present magnetic activity. To do so, we set up a parametrized one-dimensional thermal evolution <span class="hlt">model</span>. We explore a wide range of parameters by running a large set of Monte Carlo simulations. Both freezing scenarios can explain Ganymede's present-day magnetic field. Dynamos of iron snow <span class="hlt">models</span> are rather young ( < 1 Gyr), whereas dynamos below the <span class="hlt">Fe</span>S layer can be both young and much older ( ∼ 3.8 Gyr). Successful <span class="hlt">models</span> preferably contain less radiogenic heat sources in the mantle than the chondritic abundance and show a correlation between the reference viscosity in the mantle and the initial core sulfur concentration.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/22606282-dopant-concentration-dependent-growth-fe-zno-nanostructures','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/22606282-dopant-concentration-dependent-growth-fe-zno-nanostructures"><span>Dopant concentration dependent growth of <span class="hlt">Fe</span>:ZnO nanostructures</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Sahai, Anshuman; Goswami, Navendu, E-mail: navendugoswami@gmail.com</p> <p>2016-05-23</p> <p>Systematic investigations of structural properties of 1-10% <span class="hlt">Fe</span> doped ZnO nanostructure (<span class="hlt">Fe</span>:ZnO NS) prepared via chemical precipitation method have been reported. Structural properties were probed thoroughly employing scanning electron microscope (SEM) and transmission electron microscope (TEM), energy dispersive X-ray (EDAX) analysis and X-ray diffraction (XRD). Morphological transformation of nanostructures (NS) with <span class="hlt">Fe</span> incorporation is evident in SEM/TEM images. Nanoparticles (NP) obtained with 1% <span class="hlt">Fe</span>, evolve to nanorods (NR) for 3% <span class="hlt">Fe</span>; NR transform to nanocones (NC) (for 5% and 7% <span class="hlt">Fe</span>) and finally NC transform to nanoflakes (NF) at 10% <span class="hlt">Fe</span>. Morover, primary phase of Zn{sub 1-x}<span class="hlt">Fe</span>{sub x}O along withmore » secondary phases of Zn<span class="hlt">Fe</span>{sub 2}O{sub 4} and <span class="hlt">Fe</span>{sub 2}O{sub 3} were also revealed through XRD measurements. Based on collective XRD, SEM, TEM, and EDAX interpretations, a <span class="hlt">model</span> for morphological evolution of NS was proposed and the pivotal role of <span class="hlt">Fe</span> dopant was deciphered.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/22617229-statistical-theory-diffusion-concentrated-bcc-fcc-alloys-concentration-dependencies-diffusion-coefficients-bcc-alloys-fecu-femn-feni-fecr','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/22617229-statistical-theory-diffusion-concentrated-bcc-fcc-alloys-concentration-dependencies-diffusion-coefficients-bcc-alloys-fecu-femn-feni-fecr"><span>Statistical theory of diffusion in concentrated bcc and fcc alloys and concentration dependencies of diffusion coefficients in bcc alloys <span class="hlt">Fe</span>Cu, <span class="hlt">Fe</span>Mn, <span class="hlt">Fe</span>Ni, and <span class="hlt">Fe</span>Cr</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Vaks, V. G.; Khromov, K. Yu., E-mail: khromov-ky@nrcki.ru; Pankratov, I. R.</p> <p>2016-07-15</p> <p>The statistical theory of diffusion in concentrated bcc and fcc alloys with arbitrary pairwise interatomic interactions based on the master equation approach is developed. Vacancy–atom correlations are described using both the second-shell-jump and the nearest-neighbor-jump approximations which are shown to be usually sufficiently accurate. General expressions for Onsager coefficients in terms of microscopic interatomic interactions and some statistical averages are given. Both the analytical kinetic mean-field and the Monte Carlo methods for finding these averages are described. The theory developed is used to describe sharp concentration dependencies of diffusion coefficients in several iron-based alloy systems. For the bcc alloys <span class="hlt">Fe</span>Cu,more » <span class="hlt">Fe</span>Mn, and <span class="hlt">Fe</span>Ni, we predict the notable increase of the iron self-diffusion coefficient with solute concentration c, up to several times, even though values of c possible for these alloys do not exceed some percent. For the bcc alloys <span class="hlt">Fe</span>Cr at high temperatures T ≳ 1400 K, we show that the very strong and peculiar concentration dependencies of both tracer and chemical diffusion coefficients observed in these alloys can be naturally explained by the theory, without invoking exotic <span class="hlt">models</span> discussed earlier.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009EGUGA..11.8131K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009EGUGA..11.8131K"><span><span class="hlt">Fe</span>-Distribution and Hydrogen Generation During Serpentinization</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Klein, F.; Bach, W.; Jöns, N.; McCollom, T.; Berquó, T.; Moskowitz, B.</p> <p>2009-04-01</p> <p>Serpentinization of peridotite generates large amounts of dihydrogen (H2,aq), indicated by the presence of Ni-<span class="hlt">Fe</span> alloys and low-sulfur-fugacity sulfides, e. g. awaruite and pentlandite, in serpentinites. Hydrogen is produced when ferrous iron in olivine is oxidized by water to ferric iron in secondary magnetite and serpentine. This process is strongly dependent on bulk rock composition, water-to-rock ratio and temperature. These relations were examined in thermodynamic reaction path <span class="hlt">models</span> (using the EQ3/6 computer code) with dunitic and harzburgitic rock compositions. The <span class="hlt">model</span> results were compared with electron microprobe analyses, bulk magnetization measurements, and Mößbauer spectroscopy of partially to fully serpentinized dunites and harzburgites from Ocean Drilling Program Leg 209, Hole 1274A, Mid-Atlantic Ridge 15 °N. These samples have mesh rims that reveal a distinct in-to-out zoning, starting with brucite (Mg# 80) at the interface with olivine, then a zone of serpentine (Mg# 95) + brucite ± magnetite, and finally serpentine + magnetite in the outermost mesh rim. The composition of co-existing serpentine and brucite in pseudomorphic mesh rims is virtually constant in most samples from 32 to 147 meters below seafloor, suggesting similar alteration conditions of olivine downhole. Bulk magnetization measurements of microdrilled mesh rims in combination with thin section petrography revealed a positive correlation of magnetite content with extent of serpentinization. Where relic olivine is present, the magnetite content is significantly lower then in fully serpentinized rocks. In these domains with sparse magnetite, Mößbauer spectra revealed <span class="hlt">Fe</span>3+/‘ <span class="hlt">Fe</span> values between 0.30 and 0.48 for paramagnetic minerals in the mesh rims (i. e., secondary hydrous phases). In heavily to completely serpentinized rocks with abundant magnetite, <span class="hlt">Fe</span>3+/‘ <span class="hlt">Fe</span> values of the paramagnetic phases are consistently higher and range from 0.53 to 0.68. In the EQ3/6 runs, a serpentine</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://ntrs.nasa.gov/search.jsp?R=19940016295&hterms=1051&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3D%2526%25231051','NASA-TRS'); return false;" href="https://ntrs.nasa.gov/search.jsp?R=19940016295&hterms=1051&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3D%2526%25231051"><span><span class="hlt">FE</span>-60 and the evolution of eucrites</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Shukolyukov, A.; Lugmair, G. W.</p> <p>1993-01-01</p> <p>We have recently presented evidence for the existence of live <span class="hlt">Fe</span>-60 in the early solar system. This evidence comes from observations of 2.4 to 50 epsilon unit (1 <span class="hlt">part</span> in 10(exp 4)) relative excesses of Ni-60 measured in samples from the eucrite Chervony Kut (CK). These isotopic excesses have been produced by the decay of the short-lived radionuclide <span class="hlt">Fe</span>-60 (T(sub 1/2) = 1.5 Ma). Because CK originates from a planetesimal which was totally molten and its high <span class="hlt">Fe</span>/Ni ratio is due to a planet-wide <span class="hlt">Fe</span>-Ni fractionation during metal-silicate segregation, the presence of the <span class="hlt">Fe</span>-60 decay product indicates the large scale abundance of <span class="hlt">Fe</span>-60 in the early solar system and its presence during differentiation of this planetesimal. The observed variable Ni-60 excesses in different bulk samples and mineral separates from CK can only be understood if some <span class="hlt">Fe</span>-60 was still alive at the time when basaltic magma had solidified on the eucrite parent body. The lack of a correlation between Ni-60 and the respective <span class="hlt">Fe</span>/Ni ratios in different mineral fractions from CK indicates a metamorphic remobilization of Ni after essentially all <span class="hlt">Fe</span>-60 has decayed. However, Ni-60 from three bulk samples from different locations within the meteorite appears to correlate reasonably well with the respective <span class="hlt">Fe</span>/Ni ratios. If we regard this correlation as an isochron then its slope yields a <span class="hlt">Fe</span>-60/<span class="hlt">Fe</span>-56 ratio f (3.9 +/- 0.6) x 10(exp -9) and an initial Ni-60 of 3.2 plus or minus 0.9 epsilon units at the time of crystallization of CK. Estimates based on these values and a approximately 10 Ma time interval between CK solidification and formation of the earliest condensates in the solar system followed by rapid accretion of planetary bodies indicate that the decay of <span class="hlt">Fe</span>-60 could produce sufficient heat to melt these planetesimals. If Al-26 was present on a planetary scale as <span class="hlt">Fe</span>-60 and at abundances close to values observed in Allende inclusions then melting of small early formed planets is inevitable. As an</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013AGUFM.B11B0377C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013AGUFM.B11B0377C"><span>A novel <span class="hlt">Fe</span>(II)-oxidizing Epsilonproteobacterium from a streambank aquifer</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Chan, C. S.; McAllister, S.; Krepski, S.; Lin, C.; Lazareva, O.; Kan, J.</p> <p>2013-12-01</p> <p>Neutrophilic <span class="hlt">Fe</span>(II)-oxidizing microorganisms (<span class="hlt">Fe</span>OM) play significant roles in elemental cycling in freshwater environments, forming biogenic <span class="hlt">Fe</span>(III)-oxyhydroxides that sorb and sequester organics, phosphate, heavy metals, and other solutes. However, the extent of these microbes' diversity and influence are unknown, in <span class="hlt">part</span> because we may only recognize a fraction of <span class="hlt">Fe</span>OM in environmental settings. Here we describe the first known <span class="hlt">Fe</span>(II)-oxidizing Epsilonproteobacterium, Sulfuricurvum sp. strain EW, isolated from a biogeochemically dynamic streambank aquifer in southeastern Pennsylvania. This strain is related to the sulfur-oxidizer Sulfuricurvum kujiense (98.3% small subunit rRNA gene sequence identity). Strain EW is a facultative <span class="hlt">Fe</span>OM, capable of aerobically oxidizing reduced sulfur compounds, hydrogen, and a number of organic substrates. Pyrosequencing of the SSU rRNA gene (V1-V3 region) from porewater samples shows that Sulfuricurvum spp. is concentrated in an <span class="hlt">Fe</span>- and organic-rich stratum within the streambank. Over the course of a year, the temporal patterns are similar to Gallionellaceae, a family with isolates that are almost exclusively <span class="hlt">Fe</span>OM. Correlation with geochemical parameters suggest that Sulfuricurvum presence is controlled by conditions favorable for <span class="hlt">Fe</span> oxidation. These results significantly increase the known distribution, diversity, and physiology of <span class="hlt">Fe</span>OM, enabling further discoveries on the mechanisms and effects of microbial <span class="hlt">Fe</span> oxidation. Although Epsilonproteobacteria have previously been associated with H2, S, and organic metabolisms, this discovery opens the door to understanding their roles in environmental <span class="hlt">Fe</span> cycling.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018ApSS..434.1266G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018ApSS..434.1266G"><span>MIL-100-<span class="hlt">Fe</span> derived N-doped <span class="hlt">Fe/Fe</span>3C@C electrocatalysts for efficient oxygen reduction reaction</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Guo, Dakai; Han, Sancan; Wang, Jiacheng; Zhu, Yufang</p> <p>2018-03-01</p> <p>N-doped porous <span class="hlt">Fe/Fe</span>3C@C electrocatalysts were prepared by the pyrolysis of the hexamethylenetetramine (HMT)-incorporated MIL-100-<span class="hlt">Fe</span> at different temperatures (700-1000 °C) under N2 atmosphere. Rotary evaporation of MIL-100-<span class="hlt">Fe</span> and HMT solution could make more N-enriched HMT molecules enter into the pores of MIL-100-<span class="hlt">Fe</span>, thus improving nitrogen contents of the final pyrolyzed samples. All pyrolyzed samples show porous textures with middle specific surface areas. The X-ray photoelectron spectroscopy (XPS) results demonstrate the successful introduction of N atoms into carbon framework. Sample <span class="hlt">Fe</span>-N2-800 prepared by annealing the precursors with the HMT/MIL-100-<span class="hlt">Fe</span> weight ratio of 2 at 800 °C exhibits the best electrocatalytic activity towards the oxygen reduction reaction (ORR) in terms of onset potential and current density because of high graphitic N and pyridinic N content. The enwrapped <span class="hlt">Fe/Fe</span>3C nanoparticles and <span class="hlt">Fe</span>-Nx active sites in these samples could also boost the ORR activity synergistically. Moreover, sample <span class="hlt">Fe</span>-N2-800 demonstrates a dominant four electron reduction process, as well as excellent long-term operation stability and methanol crossover resistance. Thus, the N-doped <span class="hlt">Fe/Fe</span>3C@C composites derived from the HMT-incorporated MIL-100-<span class="hlt">Fe</span> are promising electrocatalysts to replace Pt/C for ORR in practical applications.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/1194314-enhanced-fe2o3-reducibility-via-surface-modification-pd-characterizing-synergy-within-pd-fe-catalysts-hydrodeoxygenation-reactions','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/1194314-enhanced-fe2o3-reducibility-via-surface-modification-pd-characterizing-synergy-within-pd-fe-catalysts-hydrodeoxygenation-reactions"><span>Enhanced <span class="hlt">Fe</span>2O3 Reducibility via Surface Modification with Pd: Characterizing the Synergy within Pd/<span class="hlt">Fe</span> Catalysts for Hydrodeoxygenation Reactions</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Hensley, Alyssa; Hong, Yongchun; Zhang, Renqin</p> <p>2014-10-03</p> <p>The synergistic catalysis in the hydrodeoxygenation of phenolic compounds over a Pd/<span class="hlt">Fe</span> bimetallic surface has been well established. However, the nature of this synergy is still in <span class="hlt">part</span> a mystery. In this work, we used a combined experimental and theoretical approach to understand a potential function of the surface Pd in the reduction of Pd/<span class="hlt">Fe</span>2O3. This function of Pd was investigated via the comparison of the reduction properties as well as other physicochemical properties of samples synthesized by the reduction of <span class="hlt">Fe</span>2O3 nanoparticles with and without surface Pd. Temperature-programmed reduction studies demonstrated the remarkable facilitation of reduction by addition ofmore » Pd, evidenced by a 150 degrees C shift toward lower temperature of the reduction peak of <span class="hlt">Fe</span>3+. From X-ray photoelectron spectroscopy and theoretical calculation results, the interaction between Pd and the <span class="hlt">Fe</span>2O3 surface occurs through the exchange of electrons with both the surface <span class="hlt">Fe</span> and O atoms. This bonding between the Pd and surface oxide elements causes the Pd to partially donate electrons to the oxide surface, making the surface electrons more delocalized. This electron delocalization stabilizes the reduced oxide surfaces, as suggested by the TPR results and theoretical prediction. Therefore, the stabilization of the reduced <span class="hlt">Fe</span> surface as well as the facilitated water formation by introduction of Pd is expected to significantly contribute to the Pd-<span class="hlt">Fe</span> synergy in hydrodeoxygenation catalysis.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19950016979','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19950016979"><span>Integrating O/S <span class="hlt">models</span> during conceptual design, <span class="hlt">part</span> 2</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Ebeling, Charles E.</p> <p>1994-01-01</p> <p>This report documents the procedures for utilizing and maintaining the Reliability & Maintainability <span class="hlt">Model</span> (RAM) developed by the University of Dayton for the National Aeronautics and Space Administration (NASA) Langley Research Center (LaRC) under NASA research grant NAG-1-1327. The purpose of the grant is to provide support to NASA in establishing operational and support parameters and costs of proposed space systems. As <span class="hlt">part</span> of this research objective, the <span class="hlt">model</span> described here was developed. Additional documentation concerning the development of this <span class="hlt">model</span> may be found in <span class="hlt">Part</span> 1 of this report. This is the 2nd <span class="hlt">part</span> of a 3 <span class="hlt">part</span> technical report.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015SurSc.640..159Y','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015SurSc.640..159Y"><span>Reaction pathways of <span class="hlt">model</span> compounds of biomass-derived oxygenates on <span class="hlt">Fe</span>/Ni bimetallic surfaces</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Yu, Weiting; Chen, Jingguang G.</p> <p>2015-10-01</p> <p>Controlling the activity and selectivity of converting biomass-derivatives to fuels and valuable chemicals is critical for the utilization of biomass feedstocks. There are primarily three classes of non-food competing biomass, cellulose, hemicellulose and lignin. In the current work, glycolaldehyde, furfural and acetaldehyde are studied as <span class="hlt">model</span> compounds of the three classes of biomass-derivatives. Monometallic Ni(111) and monolayer (ML) <span class="hlt">Fe</span>/Ni(111) bimetallic surfaces are studied for the reaction pathways of the three biomass surrogates. The ML <span class="hlt">Fe</span>/Ni(111) surface is identified as an efficient surface for the conversion of biomass-derivatives from the combined results of density functional theory (DFT) calculations and temperature programmed desorption (TPD) experiments. A correlation is also established between the optimized adsorption geometry and experimental reaction pathways. These results should provide helpful insights in catalyst design for the upgrading and conversion of biomass.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_11");'>11</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li class="active"><span>13</span></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_13 --> <div id="page_14" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li class="active"><span>14</span></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="261"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/1049188-thermodynamic-modeling-experimental-validation-fe-al-ni-cr-mo-alloy-system','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/1049188-thermodynamic-modeling-experimental-validation-fe-al-ni-cr-mo-alloy-system"><span>Thermodynamic <span class="hlt">modeling</span> and experimental validation of the <span class="hlt">Fe</span>-Al-Ni-Cr-Mo alloy system</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Teng, Zhenke; Zhang, F; Miller, Michael K</p> <p>2012-01-01</p> <p>NiAl-type precipitate-strengthened ferritic steels have been known as potential materials for the steam turbine applications. In this study, thermodynamic descriptions of the B2-NiAl type nano-scaled precipitates and body-centered-cubic (BCC) <span class="hlt">Fe</span> matrix phase for four alloys based on the <span class="hlt">Fe</span>-Al-Ni-Cr-Mo system were developed as a function of the alloy composition at the aging temperature. The calculated phase structure, composition, and volume fraction were validated by the experimental investigations using synchrotron X-ray diffraction and atom probe tomography. With the ability to accurately predict the key microstructural features related to the mechanical properties in a given alloy system, the established thermodynamic <span class="hlt">model</span> inmore » the current study may significantly accelerate the alloy design process of the NiAl-strengthened ferritic steels.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016MRE.....3j5603L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016MRE.....3j5603L"><span>Removal of Cd2+ and Cu2+ ions from aqueous solution by using <span class="hlt">Fe-Fe</span>3O4/graphene oxide as a novel and efficient adsorbent</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Le, Giang H.; Ha, Anh Q.; Nguyen, Quang K.; Nguyen, Kien T.; Dang, Phuong T.; Tran, Hoa T. K.; Vu, Loi D.; Nguyen, Tuyen V.; Lee, Gun D.; Vu, Tuan A.</p> <p>2016-10-01</p> <p>The nano <span class="hlt">Fe-Fe</span>3O4/graphene oxide (GO) was successfully synthesized by the precipitation method and followed by chemical reduction using <span class="hlt">Fe</span>Cl3 as iron sources and NaBH4 as reducing agent. The products were characterized by x-ray diffraction (XRD), Fourier transform infrared spectroscopy, transmission electron microscopy (TEM), BET, x-ray photoelectron spectroscopy (XPS) and VMS. From the obtained XRD and XPS results, it revealed the formation of both <span class="hlt">Fe</span> and <span class="hlt">Fe</span>3O4 nano particles on GO surface. TEM images showed that both <span class="hlt">Fe</span>3O4/GO and <span class="hlt">Fe-Fe</span>3O4/GO had small particle size of 10-20 nm and uniform size distribution. <span class="hlt">Fe</span>3O4/GO and <span class="hlt">Fe-Fe</span>3O4/GO were used as adsorbents for removal of Cd2+ and Cu2+ ions from aqueous solution. Maximum adsorption capacity (Q max) of <span class="hlt">Fe-Fe</span>3O4/GO for Cu2+ and Cd2+ are 90.0 mg g-1 and 108.6 mg g-1, respectively. These values are much higher as compared to those of <span class="hlt">Fe</span>3O4/GO as well as those reported in the literature. Additionally, this novel adsorbent can be reused by washing with diluted Hcl solution and easily recovered by applying the magnetic field. The Cd2+ adsorption isotherm fits better for the Langmuir <span class="hlt">model</span> that of the Freundlich <span class="hlt">model</span> and it obeys the pseudo-second order kinetic equation.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018SSCom.269...90H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018SSCom.269...90H"><span>Prediction on electronic structure of CH3NH3PbI3/<span class="hlt">Fe</span>3O4 interfaces</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Hou, Xueyao; Wang, Xiaocha; Mi, Wenbo; Du, Zunfeng</p> <p>2018-01-01</p> <p>The interfacial electronic structures of CH3NH3PbI3(MAPbI3)/<span class="hlt">Fe</span>3O4 heterostructures are predicted by density functional theory. Four <span class="hlt">models</span> (MAI/<span class="hlt">Fe</span>BO, PbI2/<span class="hlt">Fe</span>BO, MAI/<span class="hlt">Fe</span>A and PbI2/<span class="hlt">Fe</span>A) are included. Especially, a half-metal to semiconductor transition of <span class="hlt">Fe</span>3O4 appears in PbI2/<span class="hlt">Fe</span>A <span class="hlt">model</span>. A series of electric field is added to PbI2/<span class="hlt">Fe</span>A <span class="hlt">model</span>, and a direct-indirect bandgap transition of <span class="hlt">Fe</span>3O4 appears at a 500-kV/cm field. The electric field can control the bandgap of <span class="hlt">Fe</span>3O4 in PbI2/<span class="hlt">Fe</span>A <span class="hlt">model</span> by modulating the hybridization. The prediction of spin-related bandgap characteristic in MAPbI3/<span class="hlt">Fe</span>3O4 is meaningful for further study.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018PhyC..549...61W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018PhyC..549...61W"><span><span class="hlt">Fe</span>-vacancy and superconductivity in <span class="hlt">Fe</span>Se-based superconductors</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wang, C. H.; Chen, T. K.; Chang, C. C.; Lee, Y. C.; Wang, M. J.; Huang, K. C.; Wu, P. M.; Wu, M. K.</p> <p>2018-06-01</p> <p>This review summarizes recent advancements in <span class="hlt">Fe</span>Se and related systems. The <span class="hlt">Fe</span>Se and related superconductors are currently receiving considerable attention for the high Tcs observed and for many similar features to the high Tc cuprate superconductors. These similarities suggest that understanding the <span class="hlt">Fe</span>Se based compounds could potentially help our understanding of the cuprates. We shall first review the common features observed in the <span class="hlt">Fe</span>Se-based system. It was found that with a careful control of material synthesizing processes, numerous rich phases have been observed in the <span class="hlt">Fe</span>Se-based system. Detailed studies show that the <span class="hlt">Fe</span>-vacancy ordered phases found in the <span class="hlt">Fe</span>Se based compounds, which are non-superconducting Mott insulators, are the parent compounds of the superconductors. Superconductivity emerges from the parent phases by disordering the <span class="hlt">Fe</span> vacancy order, often by a simple annealing treatment. Recent high temperature X-ray diffraction experiments show that the degree of structural distortion associated with the disorder of <span class="hlt">Fe</span>-vacancy is closely related to volume fraction of the superconductivity observed. These results suggest the strong lattice to spin coupling are important for the occurrence of superconductivity in <span class="hlt">Fe</span>Se based superconductors.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018JMMM..451..193P','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018JMMM..451..193P"><span>Interface spins in polycrystalline <span class="hlt">FeMn/Fe</span> bilayers with small exchange bias</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Pires, M. J. M.</p> <p>2018-04-01</p> <p>The magnetic moments at the interface between ferromagnetic and antiferromagnetic layers play a central role in exchange biased systems, but their behavior is still not completely understood. In this work, the <span class="hlt">FeMn/Fe</span> interface in polycrystalline thin films has been studied using conversion electron Mössbauer spectroscopy (CEMS), magneto-optic Kerr effect (MOKE) and micromagnetic simulations. Samples were prepared with 57<span class="hlt">Fe</span> layers at two distinct depths in order to probe the interface and bulk behaviors. At the equilibrium, the interface moments are randomly oriented while the bulk of the <span class="hlt">Fe</span> layer has an in-plane magnetic anisotropy. Several <span class="hlt">models</span> for the interface and anisotropies of the layers were used in the simulations of spin configurations and hysteresis loops. From the whole set of simulations, one can conclude the direct analysis of hysteresis curves is not enough to infer whether the interface has a configuration with spins tilted out of the film plane at equilibrium since different choices of parameters provide similar curves. The simulations have also shown the occurrence of spin clusters at the interface is compatible with CEMS and MOKE measurements.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26896316','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26896316"><span>Characterization of <span class="hlt">Fe</span> (III)-reducing enrichment culture and isolation of <span class="hlt">Fe</span> (III)-reducing bacterium Enterobacter sp. L6 from marine sediment.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Liu, Hongyan; Wang, Hongyu</p> <p>2016-07-01</p> <p>To enrich the <span class="hlt">Fe</span> (III)-reducing bacteria, sludge from marine sediment was inoculated into the medium using <span class="hlt">Fe</span> (OH)3 as the sole electron acceptor. Efficiency of <span class="hlt">Fe</span> (III) reduction and composition of <span class="hlt">Fe</span> (III)-reducing enrichment culture were analyzed. The results indicated that the <span class="hlt">Fe</span> (III)-reducing enrichment culture with the dominant bacteria relating to Clostridium and Enterobacter sp. had high <span class="hlt">Fe</span> (III) reduction of (2.73 ± 0.13) mmol/L-<span class="hlt">Fe</span> (II). A new <span class="hlt">Fe</span> (III)-reducing bacterium was isolated from the <span class="hlt">Fe</span> (III)-reducing enrichment culture and identified as Enterobacter sp. L6 by 16S rRNA gene sequence analysis. The <span class="hlt">Fe</span> (III)-reducing ability of strain L6 under different culture conditions was investigated. The results indicated that strain L6 had high <span class="hlt">Fe</span> (III)-reducing activity using glucose and pyruvate as carbon sources. Strain L6 could reduce <span class="hlt">Fe</span> (III) at the range of NaCl concentrations tested and had the highest <span class="hlt">Fe</span> (III) reduction of (4.63 ± 0.27) mmol/L <span class="hlt">Fe</span> (II) at the NaCl concentration of 4 g/L. This strain L6 could reduce <span class="hlt">Fe</span> (III) with unique properties in adaptability to salt variation, which indicated that it can be used as a <span class="hlt">model</span> organism to study <span class="hlt">Fe</span> (III)-reducing activity isolated from marine environment. Copyright © 2015 The Society for Biotechnology, Japan. Published by Elsevier B.V. All rights reserved.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017JIEIC..98..567G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017JIEIC..98..567G"><span><span class="hlt">Modelling</span> the Peak Elongation of Nylon6 and <span class="hlt">Fe</span> Powder Based Composite Wire for FDM Feedstock Filament</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Garg, Harish Kumar; Singh, Rupinder</p> <p>2017-10-01</p> <p>In the present work, to increase the application domain of fused deposition <span class="hlt">modelling</span> (FDM) process, Nylon6-<span class="hlt">Fe</span> powder based composite wire has been prepared as feed stock filament. Further for smooth functioning of feed stock filament without any change in the hardware and software of the commercial FDM setup, the mechanical properties of the newly prepared composite wire must be comparable/at par to the existing material i.e. ABS, P-430. So, keeping this in consideration; an effort has been made to <span class="hlt">model</span> the peak elongation of in house developed feedstock filament comprising of Nylon6 and <span class="hlt">Fe</span> powder (prepared on single screw extrusion process) for commercial FDM setup. The input parameters of single screw extruder (namely: barrel temperature, temperature of the die, speed of the screw, speed of the winding machine) and rheological property of material (melt flow index) has been <span class="hlt">modelled</span> with peak elongation as the output by using response surface methodology. For validation of <span class="hlt">model</span> the result of peak elongation obtained from the <span class="hlt">model</span> equation the comparison was made with the results of actual experimentation which shows the variation of ±1 % only.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016AIPC.1728b0097V','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016AIPC.1728b0097V"><span>Synthesis and characterization of Cr doped Co<span class="hlt">Fe</span>2O4</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Verma, Kavita; Patel, K. R.; Ram, Sahi; Barbar, S. K.</p> <p>2016-05-01</p> <p>Polycrystalline samples of pure and Cr-doped cobalt ferrite (Co<span class="hlt">Fe</span>2O4 and CoCr<span class="hlt">Fe</span>O4) were prepared by solid state reaction route method. X-ray diffraction pattern infers that both the samples are in single phase with Fd3m space group. Slight reduction in the lattice parameter of CoCr<span class="hlt">Fe</span>O4 has been observed as compared to Co<span class="hlt">Fe</span>2O4. The dielectric dispersion has been explained on the basis of <span class="hlt">Fe</span>2+ ↔ <span class="hlt">Fe</span>3+ hopping mechanism. The polarizations at lower frequencies are mainly attributed to electronic exchange between <span class="hlt">Fe</span>2+ ↔ <span class="hlt">Fe</span>3+ ions on the octahedral site in the ferrite lattice. In the present system a <span class="hlt">part</span> from n-type charge carrier (<span class="hlt">Fe</span>3+/<span class="hlt">Fe</span>2+), the presence of (Co3+/Co2+) ions give rise to p-type charge carrier. Therefore in addition to n-type charge carrier, the local displacement of p-type charge carrier in direction of external electric field also contributes to net polarization. However, the dielectric constant and loss tangent of CoCr<span class="hlt">Fe</span>O4 are found to be lower than Co<span class="hlt">Fe</span>2O4 and is attributed to the availability of ferrous ion. CoCr<span class="hlt">Fe</span>O4 have less amount of ferrous ion available for polarization as compared to that of Co<span class="hlt">Fe</span>2O4. The impedance spectra reveal a grain interior contribution to the conduction process.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1177664-radiation-effects-interface-reactions-fe-fe+cr-fe+cr+ni','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1177664-radiation-effects-interface-reactions-fe-fe+cr-fe+cr+ni"><span>Radiation effects on interface reactions of U/<span class="hlt">Fe</span>, U/(<span class="hlt">Fe</span>+Cr), and U/(<span class="hlt">Fe</span>+Cr+Ni)</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Shao, Lin; Chen, Di; Wei, Chaochen; ...</p> <p>2014-10-01</p> <p>We study the effects of radiation damage on interdiffusion and intermetallic phase formation at the interfaces of U/<span class="hlt">Fe</span>, U/(<span class="hlt">Fe</span> + Cr), and U/(<span class="hlt">Fe</span> + Cr + Ni) diffusion couples. Magnetron sputtering is used to deposit thin films of <span class="hlt">Fe</span>, <span class="hlt">Fe</span> + Cr, or <span class="hlt">Fe</span> + Cr + Ni on U substrates to form the diffusion couples. One set of samples are thermally annealed under high vacuum at 450 C or 550 C for one hour. A second set of samples are annealed identically but with concurrent 3.5 MeV <span class="hlt">Fe</span>++ ion irradiation. The <span class="hlt">Fe</span>++ ion penetration depth is sufficient to reachmore » the original interfaces. Rutherford backscattering spectrometry analysis with high fidelity spectral simulations is used to obtain interdiffusion profiles, which are used to examine differences in U diffusion and intermetallic phase formation at the buried interfaces. For all three diffusion systems, <span class="hlt">Fe</span>++ ion irradiations enhance U diffusion. Furthermore, the irradiations accelerate the formation of intermetallic phases. In U/<span class="hlt">Fe</span> couples, for example, the unirradiated samples show typical interdiffusion governed by Fick’s laws, while the irradiated ones show step-like profiles influenced by Gibbs phase rules.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009JPCM...21S5402G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009JPCM...21S5402G"><span><span class="hlt">Modeling</span> local structure using crystal field and spin Hamiltonian parameters: the tetragonal <span class="hlt">Fe</span>K3+-OI2- defect center in KTaO3 crystal</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Gnutek, P.; Y Yang, Z.; Rudowicz, C.</p> <p>2009-11-01</p> <p>The local structure and the spin Hamiltonian (SH) parameters, including the zero-field-splitting (ZFS) parameters D and (a+2F/3), and the Zeeman g factors g_{\\parallel } and g_{\\perp } , are theoretically investigated for the <span class="hlt">Fe</span>K3+-OI2- center in KTaO3 crystal. The microscopic SH (MSH) parameters are <span class="hlt">modeled</span> within the framework of the crystal field (CF) theory employing the CF analysis (CFA) package, which also incorporates the MSH modules. Our approach takes into account the spin-orbit interaction as well as the spin-spin and spin-other-orbit interactions omitted in previous studies. The superposition <span class="hlt">model</span> (SPM) calculations are carried out to provide input CF parameters for the CFA/MSH package. The combined SPM-CFA/MSH approach is used to consider various structural <span class="hlt">models</span> for the <span class="hlt">Fe</span>K3+-OI2- defect center in KTaO3. This <span class="hlt">modeling</span> reveals that the off-center displacement of the <span class="hlt">Fe</span>3+ ions, Δ1(<span class="hlt">Fe</span>3+), combined with an inward relaxation of the nearest oxygen ligands, Δ2(O2-), and the existence of the interstitial oxygen OI2- give rise to a strong tetragonal crystal field. This finding may explain the large ZFS experimentally observed for the <span class="hlt">Fe</span>K3+-OI2- center in KTaO3. Matching the theoretical MSH predictions with the available structural data as well as electron magnetic resonance (EMR) and optical spectroscopy data enables predicting reasonable ranges of values of Δ1(<span class="hlt">Fe</span>3+) and Δ2(O2-) as well as the possible location of OI2- ligands around <span class="hlt">Fe</span>3+ ions in KTaO3. The defect structure <span class="hlt">model</span> obtained using the SPM-CFA/MSH approach reproduces very well the ranges of the experimental SH parameters D, g_{\\parallel } and g_{\\perp } and importantly yields not only the correct magnitude of D but also the sign, unlike previous studies. More reliable predictions may be achieved when experimental data on (a+2F/3) and/or crystal field energy levels become available. Comparison of our results with those arising from alternative <span class="hlt">models</span> existing in the literature indicates</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/1236916-isotopic-fractionation-associated-nife-fefe-hydrogenases','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/1236916-isotopic-fractionation-associated-nife-fefe-hydrogenases"><span>Isotopic fractionation associated with [Ni<span class="hlt">Fe</span>]- and [<span class="hlt">FeFe</span>]-hydrogenases</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Yang, Hui; Gandhi, Hasand; Cornish, Adam J.</p> <p>2016-01-30</p> <p>Hydrogenases catalyze the reversible formation of H2 from electrons and protons with high efficiency. Understanding the relationships between H2 production, H2 uptake, and H2-H2O exchange can provide insight into the metabolism of microbial communities in which H2 is an essential component in energy cycling. In this manuscript, we used stable H isotopes (1H and 2H) to probe the isotope effects associated with three [<span class="hlt">FeFe</span>]-hydrogenases and three [Ni<span class="hlt">Fe</span>]-hydrogenases. All six hydrogenases displayed fractionation factors for H2 formation that were significantly less than 1, producing H2 that was severely depleted in 2H relative to the substrate, water. Consistent with differences in theirmore » active site structure, the fractionation factors for each class appear to cluster, with the three [Ni<span class="hlt">Fe</span>]-hydrogenases (α = 0.27-0.40) generally having smaller values than the three [<span class="hlt">FeFe</span>]-hydrogenases (α = 0.41-0.55). We also obtained isotopic fractionation factors associated with H2 uptake and H2-H2O exchange under conditions similar to those utilized for H2 production, providing us with a more complete picture of the three reactions catalyzed by hydrogenases. The fractionation factors determined in our studies can be used as signatures for different hydrogenases to probe their activity under different growth conditions and to ascertain which hydrogenases are most responsible for H2 production and/or uptake in complex microbial communities.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2002PhDT.......124K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2002PhDT.......124K"><span><span class="hlt">Part</span> I. Cobalt thiolate complexes <span class="hlt">modeling</span> the active site of cobalt nitrile hydratase. <span class="hlt">Part</span> II. Formation of inorganic nanoparticles on protein scaffolding in Escherichia coli glutamine synthetase</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kung, Irene Yuk Man</p> <p></p> <p><span class="hlt">Part</span> I. A series of novel cobalt dithiolate complexes with mixed imine/amine ligand systems is presented here as electronic and structural <span class="hlt">models</span> for the active site in the bacterial enzyme class, nitrile hydratase (NHase). Pentadentate cobalt(II) complexes with S2N 3 ligand environments are first studied as precursors to the more relevant cobalt(III) complexes. Adjustment of the backbone length by removal of a methylene group increases the reactivity of the system; whereas reduction of the two backbone imine bonds to allow free rotation about those bonds may decrease reactivity. Reactivity change due to the replacement of the backbone amine proton with a more sterically challenging methyl group is not yet clear. Upon oxidation, the monocationic pentadentate cobalt(III) complex, 1b, shows promising reactivity similar to that of NHase. The metal's open coordination site allows reversible binding of the endogenous, monoanionic ligands, N 3- and NCS-. Oxygenation of the thiolate sulfur atoms by exposure to O2 and H2O 2 produces sulfenate and sulfinate ligands in complex 8, which resembles the crystal structure of "deactivated" <span class="hlt">Fe</span> NHase. However, its lack of reactivity argues against the oxygenated enzyme structure as the active form. Six-coordinate cobalt(III) complexes with S2N4 amine/amine ligand systems are also presented as analogues of previously reported iron(III) compounds, which mimic the spectroscopic properties of <span class="hlt">Fe</span> NHase. The cobalt complexes do not seem to similarly <span class="hlt">model</span> Co NHase. However, the S = 0 cobalt(III) center can be spectroscopically silent and difficult to detect, making comparison with synthetic <span class="hlt">models</span> using common techniques hard. <span class="hlt">Part</span> II. Dodecameric Escherichia coli glutamine synthetase mutant, E165C, stacks along its six-fold axis to produce tubular nanostructures in the presence of some divalent metal ions, as does the wild type enzyme. The centrally located, engineered Cys-165 residues appear to bind to various species and may serve as</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2008AGUFM.B11B0365D','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2008AGUFM.B11B0365D"><span>The role of <span class="hlt">Fe</span>S(aq) molecular clusters in microbial redox cycling and iron mineralization.</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Druschel, G.; Oduro, H.; Sperling, J.; Johnson, C.</p> <p>2008-12-01</p> <p>Iron sulfide molecular clusters, <span class="hlt">Fe</span>S(aq), are a group of polynuclear <span class="hlt">Fe</span>-S complexes varying in size between a few and a few hundred molecules that occur in many environments and are critical <span class="hlt">parts</span> of cycling between soluble iron and iron sulfide minerals. These clusters react uniquely with voltammetric Au-amalgam electrodes, and the signal for these molecules has now been observed in many terrestrial and marine aquatic settings. <span class="hlt">Fe</span>S(aq) clusters form when aqueous sulfide and iron(II) interact, but the source of those ions can come from abiotic or microbial sulfate and iron reduction or from the abiotic non-oxidative dissolution of iron sulfide minerals. Formation of iron sulfide minerals, principally mackinawite as the first solid nanocrystalline phase in many settings, is necessarily preceeded by formation and evolution of these molecular clusters as mineralization proceeds, and the clusters have been suggested to additionally be <span class="hlt">part</span> of the pyritization process (Rickard and Luther, 1997; Luther and Rickard, 2005). In several systems, we have also observed <span class="hlt">Fe</span>S(aq) clusters to be the link between <span class="hlt">Fe</span>-S mineral dissolution and oxidation of iron and sulfide, with important implications for changes to the overall oxidation pathway. Microorganisms can clearly be involved in the formation of <span class="hlt">Fe</span>S(aq) through iron and sulfate reduction, but it is not clear to date if organisms can utilize these clusters either as metabolic components or as anabolic 'building blocks' for enzyme production. Cycling of iron in the <span class="hlt">Fe</span>-S system linked to <span class="hlt">Fe</span>S(aq) would clearly be a critical <span class="hlt">part</span> of understanding iron isotope dynamics preserved in iron sulfide minerals. We will review ongoing work towards understanding the role of <span class="hlt">Fe</span>S(aq) in iron cycling and isotope fractionation as well as the measurement and characterization of this key class of iron complexes using environmental voltammetry.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014JNuM..448...96B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014JNuM..448...96B"><span>Application of a three-feature dispersed-barrier hardening <span class="hlt">model</span> to neutron-irradiated <span class="hlt">Fe</span>-Cr <span class="hlt">model</span> alloys</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Bergner, F.; Pareige, C.; Hernández-Mayoral, M.; Malerba, L.; Heintze, C.</p> <p>2014-05-01</p> <p>An attempt is made to quantify the contributions of different types of defect-solute clusters to the total irradiation-induced yield stress increase in neutron-irradiated (300 °C, 0.6 dpa), industrial-purity <span class="hlt">Fe</span>-Cr <span class="hlt">model</span> alloys (target Cr contents of 2.5, 5, 9 and 12 at.% Cr). Former work based on the application of transmission electron microscopy, atom probe tomography, and small-angle neutron scattering revealed the formation of dislocation loops, NiSiPCr-enriched clusters and α‧-phase particles, which act as obstacles to dislocation glide. The values of the dimensionless obstacle strength are estimated in the framework of a three-feature dispersed-barrier hardening <span class="hlt">model</span>. Special attention is paid to the effect of measuring errors, experimental details and <span class="hlt">model</span> details on the estimates. The three families of obstacles and the hardening <span class="hlt">model</span> are well capable of reproducing the observed yield stress increase as a function of Cr content, suggesting that the nanostructural features identified experimentally are the main, if not the only, causes of irradiation hardening in these <span class="hlt">model</span> alloys.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018ApJ...859..155B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018ApJ...859..155B"><span>The First Empirical Determination of the <span class="hlt">Fe</span>10+ and <span class="hlt">Fe</span>13+ Freeze-in Distances in the Solar Corona</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Boe, Benjamin; Habbal, Shadia; Druckmüller, Miloslav; Landi, Enrico; Kourkchi, Ehsan; Ding, Adalbert; Starha, Pavel; Hutton, Joseph</p> <p>2018-06-01</p> <p>Heavy ions are markers of the physical processes responsible for the density and temperature distribution throughout the fine-scale magnetic structures that define the shape of the solar corona. One of their properties, whose empirical determination has remained elusive, is the “freeze-in” distance (R f ) where they reach fixed ionization states that are adhered to during their expansion with the solar wind. We present the first empirical inference of R f for {<span class="hlt">Fe</span>}}{10+} and {<span class="hlt">Fe</span>}}{13+} derived from multi-wavelength imaging observations of the corresponding <span class="hlt">Fe</span> XI ({<span class="hlt">Fe</span>}}{10+}) 789.2 nm and <span class="hlt">Fe</span> XIV ({<span class="hlt">Fe</span>}}{13+}) 530.3 nm emission acquired during the 2015 March 20 total solar eclipse. We find that the two ions freeze-in at different heliocentric distances. In polar coronal holes (CHs) R f is around 1.45 R ⊙ for {<span class="hlt">Fe</span>}}{10+} and below 1.25 R ⊙ for {<span class="hlt">Fe</span>}}{13+}. Along open field lines in streamer regions, R f ranges from 1.4 to 2 R ⊙ for {<span class="hlt">Fe</span>}}{10+} and from 1.5 to 2.2 R ⊙ for {<span class="hlt">Fe</span>}}{13+}. These first empirical R f values: (1) reflect the differing plasma parameters between CHs and streamers and structures within them, including prominences and coronal mass ejections; (2) are well below the currently quoted values derived from empirical <span class="hlt">model</span> studies; and (3) place doubt on the reliability of plasma diagnostics based on the assumption of ionization equilibrium beyond 1.2 R ⊙.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1982iece.conf..544B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1982iece.conf..544B"><span>Relaxation-phenomena in LiAl/<span class="hlt">Fe</span>S-cells</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Borger, W.; Kappus, W.; Panesar, H. S.</p> <p></p> <p>A theoretical <span class="hlt">model</span> of the capacity of strongly relaxing electrochemical systems is applied to the LiAl/<span class="hlt">Fe</span>S system. Relaxation phenomena in LiAl and <span class="hlt">Fe</span>S electrodes can be described by this <span class="hlt">model</span>. Experimental relaxation data indicate that lithium transport through the alpha-LiAl layer to the particle surface is the capacity limiting process at high discharge current density in the LiAl electrode in LiCl-KCl and LiF-LiCl-LiBr mixtures. Strong relaxation is observed in the <span class="hlt">Fe</span>S electrode with LiCl-KCl electrolyte caused by lithium concentration gradients and precipitation of KCl in the pores.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/servlets/purl/1338727','SCIGOV-STC'); return false;" href="https://www.osti.gov/servlets/purl/1338727"><span>HPC Institutional Computing Project: W15_lesreactiveflow KIVA-hp<span class="hlt">FE</span> Development: A Robust and Accurate Engine <span class="hlt">Modeling</span> Software</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Carrington, David Bradley; Waters, Jiajia</p> <p></p> <p>KIVA-hp<span class="hlt">FE</span> is a high performance computer software for solving the physics of multi-species and multiphase turbulent reactive flow in complex geometries having immersed moving <span class="hlt">parts</span>. The code is written in Fortran 90/95 and can be used on any computer platform with any popular complier. The code is in two versions, a serial version and a parallel version utilizing MPICH2 type Message Passing Interface (MPI or Intel MPI) for solving distributed domains. The parallel version is at least 30x faster than the serial version and much faster than our previous generation of parallel engine <span class="hlt">modeling</span> software, by many factors. The 5thmore » generation algorithm construction is a Galerkin type Finite Element Method (FEM) solving conservative momentum, species, and energy transport equations along with two-equation turbulent <span class="hlt">model</span> k-ω Reynolds Averaged Navier-Stokes (RANS) <span class="hlt">model</span> and a Vreman type dynamic Large Eddy Simulation (LES) method. The LES method is capable <span class="hlt">modeling</span> transitional flow from laminar to fully turbulent; therefore, this LES method does not require special hybrid or blending to walls. The FEM projection method also uses a Petrov-Galerkin (P-G) stabilization along with pressure stabilization. We employ hierarchical basis sets, constructed on the fly with enrichment in areas associated with relatively larger error as determined by error estimation methods. In addition, when not using the hp-adaptive module, the code employs Lagrangian basis or shape functions. The shape functions are constructed for hexahedral, prismatic and tetrahedral elements. The software is designed to solve many types of reactive flow problems, from burners to internal combustion engines and turbines. In addition, the formulation allows for direct integration of solid bodies (conjugate heat transfer), as in heat transfer through housings, <span class="hlt">parts</span>, cylinders. It can also easily be extended to stress <span class="hlt">modeling</span> of solids, used in fluid structure interactions problems, solidification, porous</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20030093709','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20030093709"><span><span class="hlt">Modeling</span> of Iron K Lines: Radiative and Auger Decay Data for <span class="hlt">Fe</span> II-<span class="hlt">Fe</span> IX</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Palmeri, P.; Mendoza, C.; Kallman, T. R.; Bautista, M. A.; Melendez, M.</p> <p>2003-01-01</p> <p>A detailed analysis of the radiative and Auger de-excitation channels of K-shell vacancy states in <span class="hlt">Fe</span> II-<span class="hlt">Fe</span> IX has been carried out. Level energies, wavelengths, A-values, Auger rates and fluorescence yields have been calculated for the lowest fine-structure levels populated by photoionization of the ground state of the parent ion. Different branching ratios, namely K alpha 2/K alpha 1, K beta/K alpha, KLM/KLL, KMM/KLL, and the total K-shell fluorescence yields, omega(sub k), obtained in the present work have been compared with other theoretical data and solid-state measurements, finding good general agreement with the latter. The Kalpha 2/K alpha l ratio is found to be sensitive to the excitation mechanism. From these comparisons it has been possible to estimate an accuracy of approx.10% for the present transition probabilities.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018Icar..306..150P','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018Icar..306..150P"><span>Melting phase relations in the <span class="hlt">Fe</span>-S and <span class="hlt">Fe</span>-S-O systems at core conditions in small terrestrial bodies</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Pommier, Anne; Laurenz, Vera; Davies, Christopher J.; Frost, Daniel J.</p> <p>2018-05-01</p> <p>We report an experimental investigation of phase equilibria in the <span class="hlt">Fe</span>-S and <span class="hlt">Fe</span>-S-O systems. Experiments were performed at high temperatures (1400-1850 °C) and high pressures (14 and 20 GPa) using a multi-anvil apparatus. The results of this study are used to understand the effect of sulfur and oxygen on core dynamics in small terrestrial bodies. We observe that the formation of solid <span class="hlt">Fe</span>O grains occurs at the <span class="hlt">Fe</span>-S liquid - <span class="hlt">Fe</span> solid interface at high temperature ( > 1400 °C at 20 GPa). Oxygen fugacities calculated for each O-bearing sample show that redox conditions vary from ΔIW = -0.65 to 0. Considering the relative density of each phase and existing evolutionary <span class="hlt">models</span> of terrestrial cores, we apply our experimental results to the cores of Mars and Ganymede. We suggest that the presence of <span class="hlt">Fe</span>O in small terrestrial bodies tends to contribute to outer-core compositional stratification. Depending on the redox and thermal history of the planet, <span class="hlt">Fe</span>O may also help form a transitional redox zone at the core-mantle boundary.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018ITIP...27.1487P','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018ITIP...27.1487P"><span>Object-<span class="hlt">Part</span> Attention <span class="hlt">Model</span> for Fine-Grained Image Classification</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Peng, Yuxin; He, Xiangteng; Zhao, Junjie</p> <p>2018-03-01</p> <p>Fine-grained image classification is to recognize hundreds of subcategories belonging to the same basic-level category, such as 200 subcategories belonging to the bird, which is highly challenging due to large variance in the same subcategory and small variance among different subcategories. Existing methods generally first locate the objects or <span class="hlt">parts</span> and then discriminate which subcategory the image belongs to. However, they mainly have two limitations: (1) Relying on object or <span class="hlt">part</span> annotations which are heavily labor consuming. (2) Ignoring the spatial relationships between the object and its <span class="hlt">parts</span> as well as among these <span class="hlt">parts</span>, both of which are significantly helpful for finding discriminative <span class="hlt">parts</span>. Therefore, this paper proposes the object-<span class="hlt">part</span> attention <span class="hlt">model</span> (OPAM) for weakly supervised fine-grained image classification, and the main novelties are: (1) Object-<span class="hlt">part</span> attention <span class="hlt">model</span> integrates two level attentions: object-level attention localizes objects of images, and <span class="hlt">part</span>-level attention selects discriminative <span class="hlt">parts</span> of object. Both are jointly employed to learn multi-view and multi-scale features to enhance their mutual promotions. (2) Object-<span class="hlt">part</span> spatial constraint <span class="hlt">model</span> combines two spatial constraints: object spatial constraint ensures selected <span class="hlt">parts</span> highly representative, and <span class="hlt">part</span> spatial constraint eliminates redundancy and enhances discrimination of selected <span class="hlt">parts</span>. Both are jointly employed to exploit the subtle and local differences for distinguishing the subcategories. Importantly, neither object nor <span class="hlt">part</span> annotations are used in our proposed approach, which avoids the heavy labor consumption of labeling. Comparing with more than 10 state-of-the-art methods on 4 widely-used datasets, our OPAM approach achieves the best performance.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_12");'>12</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li class="active"><span>14</span></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_14 --> <div id="page_15" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li class="active"><span>15</span></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="281"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title12-vol2/pdf/CFR-2010-title12-vol2-part213-appA.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title12-vol2/pdf/CFR-2010-title12-vol2-part213-appA.pdf"><span>12 CFR Appendix A to <span class="hlt">Part</span> 213 - <span class="hlt">Model</span> Forms</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-01-01</p> <p>... 12 Banks and Banking 2 2010-01-01 2010-01-01 false <span class="hlt">Model</span> Forms A Appendix A to <span class="hlt">Part</span> 213 Banks and Banking FEDERAL RESERVE SYSTEM BOARD OF GOVERNORS OF THE FEDERAL RESERVE SYSTEM CONSUMER LEASING (REGULATION M) Pt. 213, App. A Appendix A to <span class="hlt">Part</span> 213—<span class="hlt">Model</span> Forms A-1<span class="hlt">Model</span> Open-End or Finance Vehicle Lease...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2011-title12-vol2/pdf/CFR-2011-title12-vol2-part213-appA.pdf','CFR2011'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2011-title12-vol2/pdf/CFR-2011-title12-vol2-part213-appA.pdf"><span>12 CFR Appendix A to <span class="hlt">Part</span> 213 - <span class="hlt">Model</span> Forms</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-01-01</p> <p>... 12 Banks and Banking 2 2011-01-01 2011-01-01 false <span class="hlt">Model</span> Forms A Appendix A to <span class="hlt">Part</span> 213 Banks and Banking FEDERAL RESERVE SYSTEM BOARD OF GOVERNORS OF THE FEDERAL RESERVE SYSTEM CONSUMER LEASING (REGULATION M) Pt. 213, App. A Appendix A to <span class="hlt">Part</span> 213—<span class="hlt">Model</span> Forms A-1<span class="hlt">Model</span> Open-End or Finance Vehicle Lease...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017EGUGA..1915893K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017EGUGA..1915893K"><span>Ligand-controlled <span class="hlt">Fe</span> mobilization catalyzed by adsorbed <span class="hlt">Fe</span>(II) on <span class="hlt">Fe</span>(hydr)oxides</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kang, Kyounglim; Biswakarma, Jagannath; Borowski, Susan C.; Hug, Stephan J.; Hering, Janet G.; Schenkeveld, Walter D. C.; Kraemer, Stephan M.</p> <p>2017-04-01</p> <p>Dissolution of <span class="hlt">Fe</span>(hydr)oxides is a key process in biological iron acquisition. Due to the low solubility of iron oxides in environments with a circumneutral pH, organisms may exude organic compounds catalyzing iron mobilization by reductive and ligand controlled dissolution mechanisms. Recently, we have shown synergistic effects between reductive dissolution and ligand-controlled dissolution that may operate in biological iron acquisition. The synergistic effects were observed in <span class="hlt">Fe</span> mobilization from single goethite suspensions as well as in suspensions containing calcareous soil[1],[2]. However, how the redox reaction accelerates <span class="hlt">Fe</span>(hydr)oxide dissolution by ligands is not studied intensively. In our study, we hypothesized that electron transfer to structural <span class="hlt">Fe</span>(III) labilizes the <span class="hlt">Fe</span>(hydr)oxide structure, and that this can accelerate ligand controlled dissolution. Systematical batch dissolution experiments were carried out under anoxic conditions at environmentally relevant pH values in which various <span class="hlt">Fe</span>(hydr)oxides (goethite, hematite, lepidocrocite) interacted with two different types of ligand (desferrioxamine B (DFOB) and N,N'-Di(2-hydroxybenzyl)ethylenediamine-N,N'-diacetic acid monohydrochloride (HBED)). Electron transfer to the structure was induced by adsorbing <span class="hlt">Fe</span>(II) to the mineral surface at various <span class="hlt">Fe</span>(II) concentrations. Our results show a distinct catalytic effect of adsorbed <span class="hlt">Fe</span>(II) on ligand controlled dissolution, even at submicromolar <span class="hlt">Fe</span>(II) concentrations. We observed the effect for a range of iron oxides, but it was strongest in lepidocrocite, most likely due to anisotropy in conductivity leading to higher near-surface concentration of reduced iron. Our results demonstrate that the catalytic effect of reductive processes on ligand controlled dissolution require a very low degree of reduction making this an efficient process for biological iron acquisition and a potentially important effect in natural iron cycling. References 1. Wang, Z. M</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.dtic.mil/docs/citations/ADA620802','DTIC-ST'); return false;" href="http://www.dtic.mil/docs/citations/ADA620802"><span>Experimental Validation of the Butyl-Rubber Finite Element (<span class="hlt">FE</span>) Material <span class="hlt">Model</span> for the Blast-Mitigating Floor Mat</span></a></p> <p><a target="_blank" href="http://www.dtic.mil/">DTIC Science & Technology</a></p> <p></p> <p>2015-08-01</p> <p>Analysis ( FEA ) results of each <span class="hlt">FE</span>-material <span class="hlt">model</span>, and the errors in each material <span class="hlt">model</span> are discussed on various metrics. 15. SUBJECT TERMS ESEP... FEAs ...................................................................... 9 Fig. 8 Velocity histories on the loading table in FEAs for 4-millisecond...10 Fig. 9 Velocity histories on the loading table in FEAs for 8-msec-pulse loading ................... 10 Fig. 10 Velocity histories on</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/23040563','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/23040563"><span>Transformation impacts of dissolved and solid phase <span class="hlt">Fe</span>(II) on trichloroethylene (TCE) reduction in an iron-reducing bacteria (IRB) mixed column system: a mathematical <span class="hlt">model</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Bae, Yeunook; Kim, Dooil; Cho, Hyun-Hee; Singhal, Naresh; Park, Jae-Woo</p> <p>2012-12-01</p> <p>In this research, we conducted trichloroethylene (TCE) reduction in a column filled with iron and iron-reducing bacteria (IRB) and developed a mathematical <span class="hlt">model</span> to investigate the critical reactions between active species in iron/IRB/contaminant systems. The formation of ferrous iron (<span class="hlt">Fe</span>(II)) in this system with IRB and zero-valent iron (ZVI, <span class="hlt">Fe</span>(0)) coated with a ferric iron (<span class="hlt">Fe</span>(III)) crust significantly affected TCE reduction and IRB respiration in various ways. This study presents a new framework for transformation property and reducing ability of both dissolved (<span class="hlt">Fe</span>(II)(dissolved)) and solid form ferrous iron (<span class="hlt">Fe</span>(II)(solid)). Results showed that TCE reduction was strongly depressed by <span class="hlt">Fe</span>(II)(solid) rather than by other inhibitors (e.g., <span class="hlt">Fe</span>(III) and lactate), suggesting that <span class="hlt">Fe</span>(II)(solid) might reduce IRB activation due to attachment to IRB cells. Newly exposed <span class="hlt">Fe</span>(0) from the released <span class="hlt">Fe</span>(II)(dissolved) was a strong contributor to TCE reduction compared to <span class="hlt">Fe</span>(II)(solid). In addition, our research confirmed that less <span class="hlt">Fe</span>(II)(solid) production strongly supported long-term TCE reduction because it may create an easier TCE approach to <span class="hlt">Fe</span>(0) or increase IRB growth. Our findings will aid the understanding of the contributions of iron media (e.g., <span class="hlt">Fe</span>(II)(solid), <span class="hlt">Fe</span>(II)(dissolved), <span class="hlt">Fe</span>(III), and <span class="hlt">Fe</span>(0)) to IRB for decontamination in natural groundwater systems. Copyright © 2012 Elsevier Ltd. All rights reserved.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/servlets/purl/1323384','SCIGOV-STC'); return false;" href="https://www.osti.gov/servlets/purl/1323384"><span>Electron transfer and atom exchange between aqueous <span class="hlt">Fe</span>(II) and structural <span class="hlt">Fe</span>(III) in clays. Role in U and Hg(II) transformations</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Scherer, Michelle</p> <p>2016-08-31</p> <p>During this project, we investigated <span class="hlt">Fe</span> electron transfer and atom exchange between aqueous <span class="hlt">Fe</span>(II) and structural <span class="hlt">Fe</span>(III) in clay minerals. We used selective chemical extractions, enriched <span class="hlt">Fe</span> isotope tracer experiments, computational molecular <span class="hlt">modeling</span>, and Mössbauer spectroscopy. Our findings indicate that structural <span class="hlt">Fe</span>(III) in clay minerals is reduced by aqueous <span class="hlt">Fe</span>(II) and that electron transfer occurs when <span class="hlt">Fe</span>(II) is sorbed to either basal planes and edge OH-groups of clay mineral. Findings from highly enriched isotope experiments suggest that up to 30 % of the <span class="hlt">Fe</span> atoms in the structure of some clay minerals exhanges with aqueous <span class="hlt">Fe</span>(II). First principles calculations usingmore » a small polaron hopping approach suggest surprisingly fast electron mobility at room temperature in a nontronite clay mineral and are consistent with temperature dependent Mössbauer data Fast electron mobility suggests that electrons may be able to conduct through the mineral fast enough to enable exchange of <span class="hlt">Fe</span> between the aqueous phase and clay mineral structure. over the time periods we observed. Our findings suggest that <span class="hlt">Fe</span> in clay minerals is not as stable as previously thought.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/25624102','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/25624102"><span>Hydrogens detected by subatomic resolution protein crystallography in a [Ni<span class="hlt">Fe</span>] hydrogenase.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Ogata, Hideaki; Nishikawa, Koji; Lubitz, Wolfgang</p> <p>2015-04-23</p> <p>The enzyme hydrogenase reversibly converts dihydrogen to protons and electrons at a metal catalyst. The location of the abundant hydrogens is of key importance for understanding structure and function of the protein. However, in protein X-ray crystallography the detection of hydrogen atoms is one of the major problems, since they display only weak contributions to diffraction and the quality of the single crystals is often insufficient to obtain sub-ångström resolution. Here we report the crystal structure of a standard [Ni<span class="hlt">Fe</span>] hydrogenase (∼91.3 kDa molecular mass) at 0.89 Å resolution. The strictly anoxically isolated hydrogenase has been obtained in a specific spectroscopic state, the active reduced Ni-R (subform Ni-R1) state. The high resolution, proper refinement strategy and careful <span class="hlt">modelling</span> allow the positioning of a large <span class="hlt">part</span> of the hydrogen atoms in the structure. This has led to the direct detection of the products of the heterolytic splitting of dihydrogen into a hydride (H(-)) bridging the Ni and <span class="hlt">Fe</span> and a proton (H(+)) attached to the sulphur of a cysteine ligand. The Ni-H(-) and <span class="hlt">Fe</span>-H(-) bond lengths are 1.58 Å and 1.78Å, respectively. Furthermore, we can assign the <span class="hlt">Fe</span>-CO and <span class="hlt">Fe</span>-CN(-) ligands at the active site, and can obtain the hydrogen-bond networks and the preferred proton transfer pathway in the hydrogenase. Our results demonstrate the precise comprehensive information available from ultra-high-resolution structures of proteins as an alternative to neutron diffraction and other methods such as NMR structural analysis.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/22370470-isochrones-old-gyr-stars-stellar-populations-models-fe-+0-fe-+0','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/22370470-isochrones-old-gyr-stars-stellar-populations-models-fe-+0-fe-+0"><span>Isochrones for old (>5 Gyr) stars and stellar populations. I. <span class="hlt">Models</span> for –2.4 ≤ [<span class="hlt">Fe</span>/H] ≤+0.6, 0.25 ≤ Y ≤ 0.33, and –0.4 ≤ [α/<span class="hlt">Fe</span>] ≤+0.4</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>VandenBerg, Don A.; Bergbusch, Peter A.; Ferguson, Jason W.</p> <p>2014-10-10</p> <p>Canonical grids of stellar evolutionary sequences have been computed for the helium mass-fraction abundances Y = 0.25, 0.29, and 0.33, and for iron abundances that vary from –2.4 to +0.4 (in 0.2 dex increments) when [α/<span class="hlt">Fe</span>] =+0.4, or for the ranges –2.0 ≤ [<span class="hlt">Fe</span>/H] ≤+0.6, –1.8 ≤ [<span class="hlt">Fe</span>/H] ≤+0.6 when [α/<span class="hlt">Fe</span>] =0.0 and –0.4, respectively. The grids, which consist of tracks for masses from 0.12 M{sub ⊙} to 1.1-1.5 M{sub ⊙} (depending on the metallicity) are based on up-to-date physics, including the gravitational settling of helium (but not metals diffusion). Interpolation software is provided to generate isochrones for arbitrary agesmore » between ≈5 and 15 Gyr and any values of Y, [α/<span class="hlt">Fe</span>], and [<span class="hlt">Fe</span>/H] within the aformentioned ranges. Comparisons of isochrones with published color-magnitude diagrams (CMDs) for the open clusters M67 ([<span class="hlt">Fe</span>/H] ≈0.0) and NGC 6791 ([<span class="hlt">Fe</span>/H] ≈0.3) and for four of the metal-poor globular clusters (47 Tuc, M3, M5, and M92) indicate that the <span class="hlt">models</span> for the observed metallicities do a reasonably good job of reproducing the locations and slopes of the cluster main sequences and giant branches. The same conclusion is reached from a consideration of plots of nearby subdwarfs that have accurate Hipparcos parallaxes and metallicities in the range –2.0 ≲ [<span class="hlt">Fe</span>/H] ≲ –1.0 on various CMDs and on the (log T {sub eff}, M{sub V} ) diagram. A relatively hot temperature scale similar to that derived in recent calibrations of the infrared flux method is favored by both the isochrones and the adopted color transformations, which are based on the latest MARCS <span class="hlt">model</span> atmospheres.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012JPSJ...81h4701S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012JPSJ...81h4701S"><span>First-Principles Study on the Gilbert Damping Constants of Transition Metal Alloys, <span class="hlt">Fe</span>--Ni and <span class="hlt">Fe</span>--Pt Systems</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Sakuma, Akimasa</p> <p>2012-08-01</p> <p>We adapt the tight-binding linear muffin-tin orbital (TB-LMTO) method to the torque-correlation <span class="hlt">model</span> for the Gilbert damping constant α and perform the first-principles calculation for disordered transition metal alloys, <span class="hlt">Fe</span>--Ni and <span class="hlt">Fe</span>--Pt systems, within the framework of the CPA. Quantitatively, the calculated α values are about one-half of the experimental values, whereas the variations in the Fermi level dependence of α are much larger than these discrepancies. As expected, we confirm in the (<span class="hlt">Fe</span>--Ni)1-XPtX and <span class="hlt">Fe</span>Pt systems that Pt atoms certainly enhance α owing to their large spin--orbit coupling. For the disordered alloys, we find that α decreases with increasing chemical degree of order in a wide range.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010SuScT..23e4001T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010SuScT..23e4001T"><span>Transport and superconducting properties of <span class="hlt">Fe</span>-based superconductors: a comparison between Sm<span class="hlt">Fe</span>AsO1-xFx and <span class="hlt">Fe</span>1+yTe1-xSex</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Tropeano, M.; Pallecchi, I.; Cimberle, M. R.; Ferdeghini, C.; Lamura, G.; Vignolo, M.; Martinelli, A.; Palenzona, A.; Putti, M.</p> <p>2010-05-01</p> <p>In this paper we carry out a direct comparison between transport and superconducting properties—namely resistivity, magnetoresistivity, Hall effect, Seebeck effect, thermal conductivity, upper critical field—of two different families of <span class="hlt">Fe</span>-based superconductors, which can be viewed in many respects as end members: Sm<span class="hlt">Fe</span>AsO1 - xFx with the largest Tc and the largest anisotropy and <span class="hlt">Fe</span>1 + yTe1 - xSex, with the largest Hc2, the lowest Tc and the lowest anisotropy. In the case of the Sm<span class="hlt">Fe</span>AsO1 - xFx series, we find that a single-band description allows us to extract an approximate estimation of band parameters such as carrier density and mobility from experimental data, although the behaviour of the Seebeck effect as a function of doping demonstrates that a multiband description would be more appropriate. On the contrary, experimental data for the <span class="hlt">Fe</span>1 + y(Te1 - x, Sex) series exhibit a strongly compensated behaviour, which can be described only within a multiband <span class="hlt">model</span>. In the <span class="hlt">Fe</span>1 + y(Te1 - x, Sex) series, the role of the excess <span class="hlt">Fe</span>, tuned by Se stoichiometry, is found to be twofold: on one hand it dopes electrons in the system and on the other hand it introduces localized magnetic moments, responsible for Kondo like scattering and likely pairbreaking of Cooper pairs. Hence, <span class="hlt">Fe</span> excess also plays a crucial role in determining superconducting properties such as the Tc and the upper critical field Hc2. The huge Hc2 values of the <span class="hlt">Fe</span>1 + yTe1 - xSex samples are described by a dirty limit law, opposed to the clean limit behaviour of the Sm<span class="hlt">Fe</span>AsO1 - xFx samples. Hence, magnetic scattering by excess <span class="hlt">Fe</span> seems to drive the system in the dirty regime, but its detrimental pairbreaking role seems not to be as severe as predicted by theory. This issue has yet to be clarified, addressing the more fundamental issue of the interplay between magnetism and superconductivity.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017AIPC.1885b0006M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017AIPC.1885b0006M"><span>Optimisation of warpage on plastic injection moulding <span class="hlt">part</span> using response surface methodology (RSM)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Miza, A. T. N. A.; Shayfull, Z.; Nasir, S. M.; Fathullah, M.; Rashidi, M. M.</p> <p>2017-09-01</p> <p>The warpage is often encountered which occur during injection moulding process of thin shell <span class="hlt">part</span> depending the process condition. The statistical design of experiment method which are Integrating Finite Element (<span class="hlt">FE</span>) Analysis, moldflow analysis and response surface methodology (RSM) are the stage of few ways in minimize the warpage values of x,y and z on thin shell plastic <span class="hlt">parts</span> that were investigated. A battery cover of a remote controller is one of the thin shell plastic <span class="hlt">part</span> that produced by using injection moulding process. The optimum process condition parameter were determined as to achieve the minimum warpage from being occur. Packing pressure, Cooling time, Melt temperature and Mould temperature are 4 parameters that considered in this study. A two full factorial experimental design was conducted in Design Expert of RSM analysis as to combine all these parameters study. <span class="hlt">FE</span> analysis result gain from analysis of variance (ANOVA) method was the one of the important process parameters influenced warpage. By using RSM, a predictive response surface <span class="hlt">model</span> for warpage data will be shown.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/18649527','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/18649527"><span>[Mechanism and promotion effect of K+ on yield of <span class="hlt">Fe</span>(VI)].</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Zhang, Yan-Ping; Xu, Guo-Ren; Li, Gui-Bai</p> <p>2008-03-01</p> <p>The mechanism and promotion effects of K+ on the yield of <span class="hlt">Fe</span>(VI) were studied during the reaction of forming ferrate. The experiment results showed that K+ is far better than Na+ for the preparation of <span class="hlt">Fe</span>(VI) at temperatures higher than 50 degrees C. The optimal temperature for the preparation of <span class="hlt">Fe</span>(VI) with K+ is 65 degrees C. During the reaction, the yield of ferrate increases with the concentration of K+, and the promotion effect of K+ is obviously with ferric nitrate dosage increase. The <span class="hlt">Fe</span>(VI) concentration prepared with 4.4 mol/L KOH is 0.05 mol/L at 85 g/L ferric nitrate; and which achieves 0.15 mol/L when added 2 mol/L K+. The promotion effect of K+ on the yield of ferrate is remarkable when ferric nitrate dosage is higher than 75 g/L, reaction temperature is below 55 degrees C and ClO(-) concentration is lower than 1.16 mol/L. The K+ can substitute for <span class="hlt">partly</span> alkalinity and reduce the concentration of OH(-) in the reaction solution. During the reaction, the K+ can enwrap around <span class="hlt">Fe</span>O4(2-) that can reduce the contact between <span class="hlt">Fe</span>(3+) and <span class="hlt">Fe</span>O4(2-), and decrease the catalysis effect of <span class="hlt">Fe</span>(3+) on <span class="hlt">Fe</span>O4(2-). At the same time, K+ can react with <span class="hlt">Fe</span>O4(2-) to form solid K4<span class="hlt">Fe</span>O4, whichwill lower the <span class="hlt">Fe</span>(VI) concentration, decrease the decomposition rate of <span class="hlt">Fe</span>(VI), enhance the stability and improve the yield of <span class="hlt">Fe</span>(VI).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013MMTB...44..506C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013MMTB...44..506C"><span>Viscosity Measurements of "<span class="hlt">Fe</span>O"-SiO2 Slag in Equilibrium with Metallic <span class="hlt">Fe</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Chen, Mao; Raghunath, Sreekanth; Zhao, Baojun</p> <p>2013-06-01</p> <p>The current study delivered the measurements of viscosities in the system "<span class="hlt">Fe</span>O"-SiO2 in equilibrium with metallic <span class="hlt">Fe</span> in the composition range between 15 and 40 wt pct SiO2. The experiments were carried out in the temperature range of 1473 K to 1773 K (1200 °C to 1500 °C) using a rotational spindle technique. An analysis of the quenched sample by electron probe X-ray microanalysis (EPMA) after the viscosity measurement enables the composition and microstructure of the slag to be directly linked with the viscosity. The current results are compared with available literature data. The significant discrepancies of the viscosity measurements in this system have been clarified. The possible reasons affecting the accuracy of the viscosity measurement have been discussed. The activation energies derived from the experimental data have a sharp increase at about 33 wt pct SiO2, which corresponds to the composition of fayalite (<span class="hlt">Fe</span>2SiO4). The modified quasi-chemical <span class="hlt">model</span> was constructed in the system "<span class="hlt">Fe</span>O"-SiO2 to describe the current viscosity data.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016PhRvC..94f5807L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016PhRvC..94f5807L"><span>β -decay rate of 59<span class="hlt">Fe</span> in shell burning environment and its influence on the production of 60<span class="hlt">Fe</span> in a massive star</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Li, K. A.; Lam, Y. H.; Qi, C.; Tang, X. D.; Zhang, N. T.</p> <p>2016-12-01</p> <p>We deduced the stellar β -decay rate of 59<span class="hlt">Fe</span> at typical carbon-shell burning temperature by taking the experimental Gamow-Teller transition strengths of the 59<span class="hlt">Fe</span> excited states. The result is also compared with those derived from large-scale shell <span class="hlt">model</span> calculations. The new rate is up to a factor of 2.5 lower than the theoretical rate of Fuller, Fowler, and Newman (FFN) and up to a factor of 5 higher than decay rate of Langanke and Martínez-Pinedo (LMP) in the temperature region 0.5 ≤T ≤2 GK. We estimated the impact of the newly determined rate on the synthesis of cosmic γ emitter 60<span class="hlt">Fe</span> in C-shell burning and explosive C/Ne burning using a one-zone <span class="hlt">model</span> calculation. Our results show that 59<span class="hlt">Fe</span> stellar β decay plays an important role in 60<span class="hlt">Fe</span> nucleosynthesis, even though the uncertainty of the decay rate is rather large due to the error of B (GT) strengths.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2003AGUFM.B42C..01R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2003AGUFM.B42C..01R"><span>Thermodynamic Versus Surface Area Control of Microbial <span class="hlt">Fe</span>(III) Oxide Reduction Kinetics</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Roden, E. E.</p> <p>2003-12-01</p> <p>Recent experimental studies of synthetic and natural <span class="hlt">Fe</span>(III) oxide reduction permit development of conceptual and quantitative <span class="hlt">models</span> of enzymatic <span class="hlt">Fe</span>(III) oxide reduction at circumneutral pH that can be compared to and contrasted with established <span class="hlt">models</span> of abiotic mineral dissolution. The findings collectively support a <span class="hlt">model</span> for controls on enzymatic reduction that differs fundamentally from those applied to abiotic reductive dissolution as a result of two basic phenomena: (1) the relatively minor influence of oxide mineralogical and thermodynamic properties on surface area-normalized rates of enzymatic reduction compared to abiotic reductive dissolution; and (2) the major limitation which sorption and/or surface precipitation of biogenic <span class="hlt">Fe</span>(II) on residual oxide and <span class="hlt">Fe</span>(III)-reducing bacterial cell surfaces poses to enzymatic electron transfer in the presence of excess electron donor. Parallel studies with two major <span class="hlt">Fe</span>(III)-reducing bacteria genera (Shewanella and Geobacter) lead to common conclusions regarding the importance of these phenomena in regulating the rate and long-term extent of <span class="hlt">Fe</span>(III) oxide reduction. Although the extent to which these phenomena can be traced to underlying kinetic vs. thermodynamic effects cannot be resolved with current information, <span class="hlt">models</span> in which rates of enzymatic reduction are limited kinetically by the abundance of "available" oxide surface sites (as controlled by oxide surface area and the abundance of surface-bound <span class="hlt">Fe</span>(II)) provide an adequate macroscopic description of controls on the initial rate and long-term extent of oxide reduction. In some instances, thermodynamic limitation posed by the accumulation of aqueous reaction end-products (i.e. <span class="hlt">Fe</span>(II) and alkalinity) must also be invoked to explain observed long-term patterns of reduction. In addition, the abundance of <span class="hlt">Fe</span>(III)-reducing microorganisms plays an important role in governing rates of reduction and needs to be considered in <span class="hlt">models</span> of <span class="hlt">Fe</span>(III) reduction in nonsteady</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017JMMM..439...17L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017JMMM..439...17L"><span>Effect of a Co<span class="hlt">Fe</span>B layer on the anisotropic magnetoresistance of Ta/Co<span class="hlt">FeB/MgO/NiFe/MgO/CoFe</span>B/Ta films</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Li, Minghua; Shi, Hui; Dong, Yuegang; Ding, Lei; Han, Gang; Zhang, Yao; Liu, Ye; Yu, Guanghua</p> <p>2017-10-01</p> <p>The anisotropic magnetoresistance (AMR) and magnetic properties of Ni<span class="hlt">Fe</span> films can be remarkably enhanced via Co<span class="hlt">Fe</span>B layer. In the case of an ultrathin Ni<span class="hlt">Fe</span> film having a Ta/Co<span class="hlt">FeB/MgO/NiFe/MgO/CoFe</span>B/Ta structure, the Co<span class="hlt">Fe</span>B/MgO layers suppressed the formation of magnetic dead layers and the interdiffusions and interface reactions between the Ni<span class="hlt">Fe</span> and Ta layers. The AMR reached a maximum value of 3.56% at 450 °C. More importantly, a single Ni<span class="hlt">Fe</span> (1 1 1) peak can be formed resulting in higher AMR values for films having Co<span class="hlt">Fe</span>B layer. This enhanced AMR also originated from the significant specular reflection of electrons owing to the crystalline MgO layer, together with the sharp interfaces with the Ni<span class="hlt">Fe</span> layer. These factors together resulted in higher AMR and improved magnetic properties.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/23039071','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/23039071"><span>Key hydride vibrational modes in [Ni<span class="hlt">Fe</span>] hydrogenase <span class="hlt">model</span> compounds studied by resonance Raman spectroscopy and density functional calculations.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Shafaat, Hannah S; Weber, Katharina; Petrenko, Taras; Neese, Frank; Lubitz, Wolfgang</p> <p>2012-11-05</p> <p>Hydrogenase proteins catalyze the reversible conversion of molecular hydrogen to protons and electrons. While many enzymatic states of the [Ni<span class="hlt">Fe</span>] hydrogenase have been studied extensively, there are multiple catalytically relevant EPR-silent states that remain poorly characterized. Analysis of <span class="hlt">model</span> compounds using new spectroscopic techniques can provide a framework for the study of these elusive states within the protein. We obtained optical absorption and resonance Raman (RR) spectra of (dppe)Ni(μ-pdt)<span class="hlt">Fe</span>(CO)(3) and [(dppe)Ni(μ-pdt)(μ-H)<span class="hlt">Fe</span>(CO)(3)][BF(4)], which are structural and functional <span class="hlt">model</span> compounds for the EPR-silent Ni-SI and Ni-R states of the [Ni<span class="hlt">Fe</span>] hydrogenase active site. The studies presented here use RR spectroscopy to probe vibrational modes of the active site, including metal-hydride stretching vibrations along with bridging ligand-metal and <span class="hlt">Fe</span>-CO bending vibrations, with isotopic substitution used to identify key metal-hydride modes. The metal-hydride vibrations are essentially uncoupled and represent isolated, localized stretching modes; the iron-hydride vibration occurs at 1530 cm(-1), while the nickel-hydride vibration is observed at 945 cm(-1). The significant discrepancy between the metal-hydride vibrational frequencies reflects the slight asymmetry in the metal-hydride bond lengths. Additionally, time-dependent density functional theory (TD-DFT) calculations were carried out to obtain theoretical RR spectra of these compounds. On the basis of the detailed comparison of theory and experiment, the dominant electronic transitions and significant normal modes probed in the RR experiments were assigned; the primary transitions in the visible wavelengths represent metal-to-metal and metal-to-ligand charge transfer bands. Inherent properties of metal-hydride vibrational modes in resonance Raman spectra and DFT calculations are discussed together with the prospects of observing such vibrational modes in metal-hydride-containing proteins. Such a</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/servlets/purl/1260082','SCIGOV-STC'); return false;" href="https://www.osti.gov/servlets/purl/1260082"><span>Binder Jetting: A Novel Nd<span class="hlt">Fe</span>B Bonded Magnet Fabrication Process</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Paranthaman, M. Parans; Shafer, Christopher S.; Elliott, Amy M.</p> <p>2016-04-05</p> <p>Our goal of this research is to fabricate near-net-shape isotropic (Nd) 2<span class="hlt">Fe</span> 14B-based (Nd<span class="hlt">Fe</span>B) bonded magnets using a three dimensional printing process to compete with conventional injection molding techniques used for bonded magnets. Additive manufacturing minimizes the waste of critical materials and allows for the creation of complex shapes and sizes. The binder jetting process works similarly to an inkjet printer. A print-head passes over a bed of Nd<span class="hlt">Fe</span>B powder and deposits a polymer binding agent to bind the layer of particles together. The bound powder is then coated with another layer of powder, building the desired shape in successivemore » layers of bonded powder. Upon completion, the green <span class="hlt">part</span> and surrounding powders are placed in an oven at temperatures between 100°C and 150°C for 4–6 h to cure the binder. After curing, the excess powder can be brushed away to reveal the completed “green” <span class="hlt">part</span>. Green magnet <span class="hlt">parts</span> were then infiltrated with a clear urethane resin to achieve the measured density of the magnet of 3.47 g/cm 3 close to 46% relative to the Nd<span class="hlt">Fe</span>B single crystal density of 7.6 g/cm 3. Magnetic measurements indicate that there is no degradation in the magnetic properties. In conclusion, this study provides a new pathway for preparing near-net-shape bonded magnets for various magnetic applications.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/22004059-stellar-laboratory-xuv-euv-line-ratios-fe-xviii-fe-xix','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/22004059-stellar-laboratory-xuv-euv-line-ratios-fe-xviii-fe-xix"><span>Stellar and laboratory XUV/EUV line ratios in <span class="hlt">Fe</span> XVIII and <span class="hlt">Fe</span> XIX</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Traebert, E.; Beiersdorfer, P.; Clementson, J.</p> <p>2012-05-25</p> <p>A so-called XUV excess has been suspected with the relative fluxes of <span class="hlt">Fe</span> XVIII and <span class="hlt">Fe</span> XIX lines observed in the XUV and EUV ranges of the spectrum of the star Capella as observed by the Chandra spacecraft, even after correction for interstellar absorption. This excess becomes apparent in the comparison of the observations with simulations of stellar spectra obtained using collisional-radiative <span class="hlt">models</span> that employ, for example, the Atomic Plasma Emission Code (APEC) or the Flexible Atomic Code (FAC). We have addressed this problem by laboratory studies using the Livermore electron beam ion trap (EBIT).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/servlets/purl/1253237','SCIGOV-STC'); return false;" href="https://www.osti.gov/servlets/purl/1253237"><span>Evaluation on the Effect of Composition on Radiation Hardening and Embrittlement in <span class="hlt">Model</span> <span class="hlt">Fe</span>CrAl Alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Field, Kevin G.; Briggs, Samuel A.; Edmondson, Philip</p> <p>2015-09-18</p> <p>This report details the findings of post-radiation mechanical testing and microstructural characterization performed on a series of <span class="hlt">model</span> and commercial <span class="hlt">Fe</span>CrAl alloys to assist with the development of a cladding technology with enhanced accident tolerance. The samples investigated include <span class="hlt">model</span> alloys with simple ferritic grain structure and two commercial alloys with minor solute additions. These samples were irradiated in the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory (ORNL) up to nominal doses of 7.0 dpa near or at Light Water Reactor (LWR) relevant temperatures (300-400 C). Characterization included a suite of techniques including small angle neutron scatteringmore » (SANS), atom probe tomography (APT), and transmission based electron microscopy techniques. Mechanical testing included tensile tests at room temperature on sub-sized tensile specimens. The goal of this work was to conduct detailed characterization and mechanical testing to begin establishing empirical and/or theoretical structure-property relationships for radiation-induced hardening and embrittlement in the <span class="hlt">Fe</span>CrAl alloy class. Development of such relationships will provide insight on the performance of <span class="hlt">Fe</span>CrAl alloys in an irradiation environment and will enable further development of the alloy class for applications within a LWR environment. A particular focus was made on establishing trends, including composition and radiation dose. The report highlights in detail the pertinent findings based on this work. This report shows that radiation hardening in the alloys is primarily composition dependent due to the phase separation in the high-Cr <span class="hlt">Fe</span>CrAl alloys. Other radiation induced/enhanced microstructural features were less dependent on composition and when observed at low number densities, were not a significant contributor to the observed mechanical responses. Pre-existing microstructure in the alloys was found to be important, with grain boundaries and pre</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_13");'>13</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li class="active"><span>15</span></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_15 --> <div id="page_16" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li class="active"><span>16</span></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="301"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018MS%26E..328a2026Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018MS%26E..328a2026Z"><span>Hole Feature on Conical Face Recognition for Turning <span class="hlt">Part</span> <span class="hlt">Model</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zubair, A. F.; Abu Mansor, M. S.</p> <p>2018-03-01</p> <p>Computer Aided Process Planning (CAPP) is the bridge between CAD and CAM and pre-processing of the CAD data in the CAPP system is essential. For CNC turning <span class="hlt">part</span>, conical faces of <span class="hlt">part</span> <span class="hlt">model</span> is inevitable to be recognised beside cylindrical and planar faces. As the sinus cosines of the cone radius structure differ according to different <span class="hlt">models</span>, face identification in automatic feature recognition of the <span class="hlt">part</span> <span class="hlt">model</span> need special intention. This paper intends to focus hole on feature on conical faces that can be detected by CAD solid <span class="hlt">modeller</span> ACIS via. SAT file. Detection algorithm of face topology were generated and compared. The study shows different faces setup for similar conical <span class="hlt">part</span> <span class="hlt">models</span> with different hole type features. Three types of holes were compared and different between merge faces and unmerge faces were studied.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018NatCh..10..555R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018NatCh..10..555R"><span>A [4<span class="hlt">Fe</span>-4S]-<span class="hlt">Fe</span>(CO)(CN)-l-cysteine intermediate is the first organometallic precursor in [<span class="hlt">FeFe</span>] hydrogenase H-cluster bioassembly</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Rao, Guodong; Tao, Lizhi; Suess, Daniel L. M.; Britt, R. David</p> <p>2018-05-01</p> <p>Biosynthesis of the [<span class="hlt">FeFe</span>] hydrogenase active site (the 'H-cluster') requires the interplay of multiple proteins and small molecules. Among them, the radical S-adenosylmethionine enzyme HydG, a tyrosine lyase, has been proposed to generate a complex that contains an <span class="hlt">Fe</span>(CO)2(CN) moiety that is eventually incorporated into the H-cluster. Here we describe the characterization of an intermediate in the HydG reaction: a [4<span class="hlt">Fe</span>-4S][(Cys)<span class="hlt">Fe</span>(CO)(CN)] species, 'Complex A', in which a CO, a CN- and a cysteine (Cys) molecule bind to the unique 'dangler' <span class="hlt">Fe</span> site of the auxiliary [5<span class="hlt">Fe</span>-4S] cluster of HydG. The identification of this intermediate—the first organometallic precursor to the H-cluster—validates the previously hypothesized HydG reaction cycle and provides a basis for elucidating the biosynthetic origin of other moieties of the H-cluster.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26440264','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26440264"><span>Multi-view and 3D deformable <span class="hlt">part</span> <span class="hlt">models</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Pepik, Bojan; Stark, Michael; Gehler, Peter; Schiele, Bernt</p> <p>2015-11-01</p> <p>As objects are inherently 3D, they have been <span class="hlt">modeled</span> in 3D in the early days of computer vision. Due to the ambiguities arising from mapping 2D features to 3D <span class="hlt">models</span>, 3D object representations have been neglected and 2D feature-based <span class="hlt">models</span> are the predominant paradigm in object detection nowadays. While such <span class="hlt">models</span> have achieved outstanding bounding box detection performance, they come with limited expressiveness, as they are clearly limited in their capability of reasoning about 3D shape or viewpoints. In this work, we bring the worlds of 3D and 2D object representations closer, by building an object detector which leverages the expressive power of 3D object representations while at the same time can be robustly matched to image evidence. To that end, we gradually extend the successful deformable <span class="hlt">part</span> <span class="hlt">model</span> [1] to include viewpoint information and <span class="hlt">part</span>-level 3D geometry information, resulting in several different <span class="hlt">models</span> with different level of expressiveness. We end up with a 3D object <span class="hlt">model</span>, consisting of multiple object <span class="hlt">parts</span> represented in 3D and a continuous appearance <span class="hlt">model</span>. We experimentally verify that our <span class="hlt">models</span>, while providing richer object hypotheses than the 2D object <span class="hlt">models</span>, provide consistently better joint object localization and viewpoint estimation than the state-of-the-art multi-view and 3D object detectors on various benchmarks (KITTI [2] , 3D object classes [3] , Pascal3D+ [4] , Pascal VOC 2007 [5] , EPFL multi-view cars[6] ).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/25671351','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/25671351"><span>Atom exchange between aqueous <span class="hlt">Fe</span>(II) and structural <span class="hlt">Fe</span> in clay minerals.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Neumann, Anke; Wu, Lingling; Li, Weiqiang; Beard, Brian L; Johnson, Clark M; Rosso, Kevin M; Frierdich, Andrew J; Scherer, Michelle M</p> <p>2015-03-03</p> <p>Due to their stability toward reductive dissolution, <span class="hlt">Fe</span>-bearing clay minerals are viewed as a renewable source of <span class="hlt">Fe</span> redox activity in diverse environments. Recent findings of interfacial electron transfer between aqueous <span class="hlt">Fe</span>(II) and structural <span class="hlt">Fe</span> in clay minerals and electron conduction in octahedral sheets of nontronite, however, raise the question whether <span class="hlt">Fe</span> interaction with clay minerals is more dynamic than previously thought. Here, we use an enriched isotope tracer approach to simultaneously trace <span class="hlt">Fe</span> atom movement from the aqueous phase to the solid ((57)<span class="hlt">Fe</span>) and from the solid into the aqueous phase ((56)<span class="hlt">Fe</span>). Over 6 months, we observed a significant decrease in aqueous (57)<span class="hlt">Fe</span> isotope fraction, with a fast initial decrease which slowed after 3 days and stabilized after about 50 days. For the aqueous (56)<span class="hlt">Fe</span> isotope fraction, we observed a similar but opposite trend, indicating that <span class="hlt">Fe</span> atom movement had occurred in both directions: from the aqueous phase into the solid and from the solid into aqueous phase. We calculated that 5-20% of structural <span class="hlt">Fe</span> in clay minerals NAu-1, NAu-2, and SWa-1 exchanged with aqueous <span class="hlt">Fe</span>(II), which significantly exceeds the <span class="hlt">Fe</span> atom layer exposed directly to solution. Calculations based on electron-hopping rates in nontronite suggest that the bulk conduction mechanism previously demonstrated for hematite1 and suggested as an explanation for the significant <span class="hlt">Fe</span> atom exchange observed in goethite2 may be a plausible mechanism for <span class="hlt">Fe</span> atom exchange in <span class="hlt">Fe</span>-bearing clay minerals. Our finding of 5-20% <span class="hlt">Fe</span> atom exchange in clay minerals indicates that we need to rethink how <span class="hlt">Fe</span> mobility affects the macroscopic properties of <span class="hlt">Fe</span>-bearing phyllosilicates and its role in <span class="hlt">Fe</span> biogeochemical cycling, as well as its use in a variety of engineered applications, such as landfill liners and nuclear repositories.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/servlets/purl/1159827','DOE-PATENT-XML'); return false;" href="https://www.osti.gov/servlets/purl/1159827"><span>Process and genes for expression and overexpression of active [<span class="hlt">FeFe</span>] hydrogenases</span></a></p> <p><a target="_blank" href="http://www.osti.gov/doepatents">DOEpatents</a></p> <p>Seibert, Michael; King, Paul W; Ghirardi, Maria Lucia; Posewitz, Matthew C; Smolinski, Sharon L</p> <p>2014-09-16</p> <p>A process for expression of active [<span class="hlt">FeFe</span>]-hydrogenase in a host organism that does not contain either the structural gene(s) for [<span class="hlt">FeFe</span>]-hydrogenases and/or homologues for the maturation genes HydE, HydF and HyG, comprising: cloning the structural hydrogenase gene(s) and/or the maturation genes HydE, HydF and HydG from an organisms that contains these genes into expression plasmids; transferring the plasmids into an organism that lacks a native [<span class="hlt">FeFe</span>]-hydrogenase or that has a disrupted [<span class="hlt">FeFe</span>]-hydrogenase and culturing it aerobically; and inducing anaerobiosis to provide [<span class="hlt">FeFe</span>] hydrogenase biosynthesis and H?2#191 production.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010JPhCS.200g2068Y','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010JPhCS.200g2068Y"><span>Ab Initio calculation on magnetism of monatomic <span class="hlt">Fe</span> nanowire on Au (111) surface</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Yasui, Takashi; Nawate, Masahiko</p> <p>2010-01-01</p> <p>The magnetic anisotropy of the one-dimensional monatomic <span class="hlt">Fe</span> wire on the Au (111) texture has been theoretically analyzed using Wien2k flamework. The <span class="hlt">model</span> simulates experimentally observed ferromagnetic <span class="hlt">Fe</span> monatomic wire self-organized along the terrace edge of the Au (788) plane, which exhibits the magnetizaiton perpendicular both the wire and Au plane. In the case of the <span class="hlt">model</span> consisting the one-dimensional <span class="hlt">Fe</span> wire placed on the Au (111) plane with the Au lattice cite, no significant anisotropy is resulted by the calculation. On the other hand, the <span class="hlt">model</span> where the <span class="hlt">Fe</span> wire is formed along the Au terrace like step indicates the anisotropy of which easy direction is along the wire, resulting in differenct direction from the experiment. When we introduce the disorder in the <span class="hlt">Fe</span> wire array, the easy direction changes. As for the <span class="hlt">model</span> that the every other <span class="hlt">Fe</span> atoms are slightly closer to the Au step (approx 0.0091 nm) the easy direction turns to be perpendicular to the wire and parallel to the Au plane, that is, the dislocation direction. The disorder in the <span class="hlt">Fe</span> wire seems to play significant roll in the anisotropy.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018JMMM..454..125B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018JMMM..454..125B"><span>Magnetic Compton scattering study of Laves phase Zr<span class="hlt">Fe</span>2 and Sc doped Zr<span class="hlt">Fe</span>2: Experiment and Green function based relativistic calculations</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Bhatt, Samir; Mund, H. S.; Kumar, Kishor; Bapna, Komal; Dashora, Alpa; Itou, M.; Sakurai, Y.; Ahuja, B. L.</p> <p>2018-05-01</p> <p>Spin momentum densities of ferromagnetic Zr<span class="hlt">Fe</span>2 and Zr0.8Sc0.2<span class="hlt">Fe</span>2 have been measured using magnetic Compton scattering with 182.65 keV circularly polarized synchrotron radiations. Site specific spin moments, which are responsible for the formation of total spin moment, have been deduced from Compton line shapes. At room temperature, the computed spin moment of Zr<span class="hlt">Fe</span>2 is found to be slightly higher than that of Sc doped Zr<span class="hlt">Fe</span>2 which is in consensus with the magnetization data. To compare the experimental data, we have also computed magnetic Compton profiles (MCPs), total and partial spin projected density of states (DOS) and the site specific spin moments using spin-polarized relativistic Korringa-Kohn-Rostoker method. It is observed that the spin moment at <span class="hlt">Fe</span> site is aligned antiparallel to that of Zr site in both Zr<span class="hlt">Fe</span>2 and Zr0.8Sc0.2<span class="hlt">Fe</span>2. The MCP results when compared with vibrating sample magnetometer based magnetization data, show a very small contribution of orbital moment in the formation of total magnetic moments in both the compounds. The DOS of ferromagnetic ground state of Zr<span class="hlt">Fe</span>2 and Zr0.8Sc0.2<span class="hlt">Fe</span>2 are interpreted on the basis of a covalent magnetic <span class="hlt">model</span> beyond the Stoner rigid band <span class="hlt">model</span>. It appears that on alloying between a magnetic and a non-magnetic partner (with low valence), a polarization develops on the non-magnetic atom which is anti-parallel to that of the magnetic atom.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015APS..MARQ30014C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015APS..MARQ30014C"><span>Atomistic <span class="hlt">modeling</span> of L10 <span class="hlt">Fe</span>Pt: path to HAMR 5Tb/in2</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Chen, Tianran; Benakli, Mourad; Rea, Chris</p> <p>2015-03-01</p> <p>Heat assisted magnetic recording (HAMR) is a promising approach for increasing the storage density of hard disk drives. To increase data density, information must be written in small grains, which requires materials with high anisotropy energy such as L10 <span class="hlt">Fe</span>Pt. On the other hand, high anisotropy implies high coercivity, making it difficult to write the data with existing recording heads. This issue can be overcome by the technique of HAMR, where a laser is used to heat the recording medium to reduce its coercivity while retaining good thermal stability at room temperature due to the large anisotropy energy. One of the keys to the success of HAMR is the precise control of writing process. In this talk, I will propose a Monte Carlo simulation, based on an atomistic <span class="hlt">model</span>, that would allow us to study the magnetic properties of L10 <span class="hlt">Fe</span>Pt and dynamics of spin reversal for the writing process in HAMR.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JAP...118d3902A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JAP...118d3902A"><span><span class="hlt">Modeling</span> interface exchange coupling: Effect on switching of granular <span class="hlt">Fe</span>Pt films</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Abugri, Joseph B.; Visscher, P. B.; Su, Hao; Gupta, Subhadra</p> <p>2015-07-01</p> <p>To raise the areal density of magnetic recording to ˜1 Tbit/in2, there has been much recent work on the use of <span class="hlt">Fe</span>Pt granular films, because their high perpendicular anisotropy allows small grains to be stable. However, their coercivity may be higher than available write-head fields. One approach to reduce the coercivity is to heat the grain (heat assisted magnetic recording). Another strategy is to add a soft capping layer to help nucleate switching via exchange coupling with the hard <span class="hlt">Fe</span>Pt grains. We have simulated a <span class="hlt">model</span> of such a capped medium and have studied the effect of the strength of the interface exchange and thickness of hard layer and soft layer on the overall coercivity. Although the magnetization variation within such boundary layers may be complex, the net effect of the boundary can often be <span class="hlt">modeled</span> as an infinitely thin interface characterized by an interface exchange energy density—we show how to do this consistently in a micromagnetic simulation. Although the switching behavior in the presence of exchange, magnetostatic, and external fields is quite complex, we show that by adding these fields one at a time, the main features of the M-H loop can be understood. In particular, we find that even without hard-soft interface exchange, magnetostatic coupling eliminates the zero-field kink in the loop, so that the absence of the kink does not (as has sometimes been assumed) imply exchange coupling. The computations have been done with a public-domain micromagnetics simulator that has been adapted to easily simulate arrays of grains.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://ntrs.nasa.gov/search.jsp?R=19770058594&hterms=solubility+iron+compounds&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dsolubility%2Biron%2Bcompounds','NASA-TRS'); return false;" href="https://ntrs.nasa.gov/search.jsp?R=19770058594&hterms=solubility+iron+compounds&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D20%26Ntt%3Dsolubility%2Biron%2Bcompounds"><span>Solubility of K in <span class="hlt">Fe</span>-S liquid, silicate-K/<span class="hlt">Fe</span>-S/liq equilibria, and their planetary implications</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Gangully, J.; Kennedy, G. C.</p> <p>1977-01-01</p> <p>Potassium has been found to have extremely limited absolute solubility in <span class="hlt">Fe</span>-S liquid in the pressure-temperature range of 18 to 40 kbars, 1050 to 1150 C, and fO2 within the field of metallic iron. It also partitioned into a certain silicate phase highly in preference to <span class="hlt">Fe</span>-S liquid at 30 kbar and 1100 C. The dependence of the partitioning of K between solid silicate and <span class="hlt">Fe</span>-S liquid on fO2 and compositions of mineral solid solutions have been analyzed. These experimental data, along with those of others, limit the amount of K that could fractionate in <span class="hlt">Fe</span>-S liquid layers or a core in the early history of the moon and, thus, act as localized heat sources in its thermal history <span class="hlt">models</span>; the data also seem to argue against a chondritic abundance of potassium for earth. The question of fractionation of enough K-40 in an <span class="hlt">Fe</span>-S liquid outer core of earth to provide the necesary thermal energy for the geomagnetic dynamo remains unresolved.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/986789-spin-fluctuations-superconductivity-tight-binding-model-bafe2as2','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/986789-spin-fluctuations-superconductivity-tight-binding-model-bafe2as2"><span>Spin fluctuations and superconductivity in a 3D tight-binding <span class="hlt">model</span> for Ba<span class="hlt">Fe</span>2As2</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Graser, Siegfried; Kemper, Alexander F; Maier, Thomas A</p> <p>2010-01-01</p> <p>Despite the wealth of experimental data on the <span class="hlt">Fe</span>-pnictide compounds of the KFe2As2 type, K=Ba, Ca, or Sr, the main theoretical work based on multiorbital tight-binding <span class="hlt">models</span> has been restricted so far to the study of the related 1111 compounds. This can be ascribed to the more three-dimensional electronic structure found by ab initio calculations for the 122 materials, making this system less amenable to <span class="hlt">model</span> development. In addition, the more complicated Brillouin zone BZ of the body-centered tetragonal symmetry does not allow a straightforward unfolding of the electronic band structure into an effective 1<span class="hlt">Fe</span>/unit cell BZ. Here we presentmore » an effective five-orbital tight-binding fit of the full density functional theory band structure for Ba<span class="hlt">Fe</span>2As2 including the kz dispersions. We compare the five-orbital spin fluctuation <span class="hlt">model</span> to one previously studied for LaOFeAs and calculate the random-phase approximation enhanced susceptibility. Using the fluctuation ex- change approximation to determine the leading pairing instability, we then examine the differences between a strictly two-dimensional <span class="hlt">model</span> calculation over a single kz cut of the BZ and a completely three-dimensional approach. We find pairing states quite similar to the 1111 materials, with generic quasi-isotropic pairing on the hole sheets and nodal states on the electron sheets at kz=0, which however are gapped as the system is hole doped. On the other hand, a substantial kz dependence of the order parameter remains, with most of the pairing strength deriving from processes near kz=?. These states exhibit a tendency for an enhanced anisotropy on the hole sheets and a reduced anisotropy on the electron sheets near the top of the BZ.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/11782196','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/11782196"><span>Nature of impurities in fertilizers containing EDDHMA/<span class="hlt">Fe</span>(3+), EDDHSA/<span class="hlt">Fe</span>(3+), and EDDCHA/<span class="hlt">Fe</span>(3+) chelates.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Alvarez-Fernández, Ana; Cremonini, Mauro A; Sierra, Miguel A; Placucci, Giuseppe; Lucena, Juan J</p> <p>2002-01-16</p> <p>Iron chelates derived from ethylenediaminedi(o-hydroxyphenylacetic) acid (EDDHA), ethylenediaminedi(o-hydroxy-p-methylphenylacetic) acid (EDDHMA), ethylenediaminedi(2-hydroxy-5-sulfophenylacetic) acid (EDDHSA), and ethylenediaminedi(5-carboxy-2-hydroxyphenylacetic) acid (EDDCHA) are remarkably efficient in correcting iron chlorosis in plants growing in alkaline soils. This work reports the determination of impurities in commercial samples of fertilizers containing EDDHMA/<span class="hlt">Fe</span>(3+), EDDHSA/<span class="hlt">Fe</span>(3+), and EDDCHA/<span class="hlt">Fe</span>(3+). The active components (EDDHMA/<span class="hlt">Fe</span>(3+), EDDHSA/<span class="hlt">Fe</span>(3+), and EDDCHA/<span class="hlt">Fe</span>(3+)) were separated easily from other compounds present in the fertilizers by HPLC. Comparison of the retention times and the UV-visible spectra of the peaks obtained from commercial EDDHSA/<span class="hlt">Fe</span>(3+) and EDDCHA/<span class="hlt">Fe</span>(3+) samples with those of standard solutions showed that unreacted starting materials (p-hydroxybenzenesulfonic acid and p-hydroxybenzoic acid, respectively) were always present in the commercial products. 1D and 2D NMR experiments showed that commercial fertilizers based on EDDHMA/<span class="hlt">Fe</span>(3+) contained impurities having structures tentatively assigned to iron chelates of two isomers of EDDHMA. These findings suggest that current production processes of iron chelates used in agriculture need to be improved.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4871239','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4871239"><span><span class="hlt">Modelling</span> household finances: A Bayesian approach to a multivariate two-<span class="hlt">part</span> <span class="hlt">model</span></span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Brown, Sarah; Ghosh, Pulak; Su, Li; Taylor, Karl</p> <p>2016-01-01</p> <p>We contribute to the empirical literature on household finances by introducing a Bayesian multivariate two-<span class="hlt">part</span> <span class="hlt">model</span>, which has been developed to further our understanding of household finances. Our flexible approach allows for the potential interdependence between the holding of assets and liabilities at the household level and also encompasses a two-<span class="hlt">part</span> process to allow for differences in the influences on asset or liability holding and on the respective amounts held. Furthermore, the framework is dynamic in order to allow for persistence in household finances over time. Our findings endorse the joint <span class="hlt">modelling</span> approach and provide evidence supporting the importance of dynamics. In addition, we find that certain independent variables exert different influences on the binary and continuous <span class="hlt">parts</span> of the <span class="hlt">model</span> thereby highlighting the flexibility of our framework and revealing a detailed picture of the nature of household finances. PMID:27212801</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://pubs.er.usgs.gov/publication/70010165','USGSPUBS'); return false;" href="https://pubs.er.usgs.gov/publication/70010165"><span>Melting relations in the <span class="hlt">Fe</span>-rich portion of the system <span class="hlt">FeFe</span>S at 30 kb pressure</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Brett, R.; Bell, P.M.</p> <p>1969-01-01</p> <p>The melting relations of <span class="hlt">FeFe</span>S mixtures covering the composition range from <span class="hlt">Fe</span> to <span class="hlt">Fe</span>67S33 have been determined at 30 kb pressure. The phase relations are similar to those at low pressure. The eutectic has a composition of <span class="hlt">Fe</span>72.9S27.1 and a temperature of 990??C. Solubility of S in <span class="hlt">Fe</span> at elevated temperatures at 30 kb is of the same order of magnitude as at low pressure. Sulfur may have significantly lowered the melting point of iron in the upper mantle during the period of coalescence of metal prior to core formation in the primitive earth. ?? 1969.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014MMTB...45...58C','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014MMTB...45...58C"><span>Viscosity Measurements of SiO2-"<span class="hlt">Fe</span>O"-MgO System in Equilibrium with Metallic <span class="hlt">Fe</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Chen, Mao; Raghunath, Sreekanth; Zhao, Baojun</p> <p>2014-01-01</p> <p>The present study delivers the measurements of viscosities in the SiO2-"<span class="hlt">Fe</span>O"-MgO system in equilibrium with metallic <span class="hlt">Fe</span>. The rotational spindle technique was used for the measurements at the temperature range of 1523 K to 1773 K (1250 °C to 1500 °C). Molybdenum crucibles and spindles were employed in all measurements. The viscosity measurements were carried out at 31 to 47 mol pct SiO2 and up to 18.8 mol pct MgO. Analysis of the quenched sample by Electron probe X-ray microanalysis after the viscosity measurement enables the composition and microstructure of the slag to be directly linked with the viscosity. The replacement of "<span class="hlt">Fe</span>O" by MgO was found to increase viscosity and activation energy of the SiO2-"<span class="hlt">Fe</span>O"-MgO slags. The modified Quasi-chemical Viscosity <span class="hlt">Model</span> was further optimized in this system based on the current viscosity measurements.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://cfpub.epa.gov/si/si_public_record_report.cfm?dirEntryId=65529&Lab=NRMRL&keyword=true+AND+experimental&actType=&TIMSType=+&TIMSSubTypeID=&DEID=&epaNumber=&ntisID=&archiveStatus=Both&ombCat=Any&dateBeginCreated=&dateEndCreated=&dateBeginPublishedPresented=&dateEndPublishedPresented=&dateBeginUpdated=&dateEndUpdated=&dateBeginCompleted=&dateEndCompleted=&personID=&role=Any&journalID=&publisherID=&sortBy=revisionDate&count=50','EPA-EIMS'); return false;" href="https://cfpub.epa.gov/si/si_public_record_report.cfm?dirEntryId=65529&Lab=NRMRL&keyword=true+AND+experimental&actType=&TIMSType=+&TIMSSubTypeID=&DEID=&epaNumber=&ntisID=&archiveStatus=Both&ombCat=Any&dateBeginCreated=&dateEndCreated=&dateBeginPublishedPresented=&dateEndPublishedPresented=&dateBeginUpdated=&dateEndUpdated=&dateBeginCompleted=&dateEndCompleted=&personID=&role=Any&journalID=&publisherID=&sortBy=revisionDate&count=50"><span>REVIEW OF INDOOR EMISSION SOURCE <span class="hlt">MODELS</span>: <span class="hlt">PART</span> 2. PARAMETER ESTIMATION</span></a></p> <p><a target="_blank" href="http://oaspub.epa.gov/eims/query.page">EPA Science Inventory</a></p> <p></p> <p></p> <p>This review consists of two sections. <span class="hlt">Part</span> I provides an overview of 46 indoor emission source <span class="hlt">models</span>. <span class="hlt">Part</span> 2 (this paper) focuses on parameter estimation, a topic that is critical to <span class="hlt">modelers</span> but has never been systematically discussed. A perfectly valid <span class="hlt">model</span> may not be a usefu...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1198320-spin-lattice-coupling-superconductivity-fe-pnictides','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1198320-spin-lattice-coupling-superconductivity-fe-pnictides"><span>Spin-Lattice Coupling and Superconductivity in <span class="hlt">Fe</span> Pnictides</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Egami, T.; Fine, B. V.; Parshall, D.; ...</p> <p>2010-01-01</p> <p>We consider strong spin-lattice and spin-phonon coupling in iron pnictides and discuss its implications on superconductivity. Strong magneto-volume effect in iron compounds has long been known as the Invar effect. <span class="hlt">Fe</span> pnictides also exhibit this effect, reflected in particular on the dependence of the magnetic moment on the atomic volume of <span class="hlt">Fe</span> defined by the positions of the nearest neighbor atoms. Through the phenomenological Landau theory, developed on the basis of the calculations by the density functional theory (DFT) and the experimental results, we quantify the strength of the spin-lattice interaction as it relates to the Stoner criterion for themore » onset of magnetism. We suggest that the coupling between electrons and phonons through the spin channel may be sufficiently strong to be an important <span class="hlt">part</span> of the superconductivity mechanism in <span class="hlt">Fe</span> pnictides.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/21444783','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/21444783"><span>Characterization of a unique [<span class="hlt">Fe</span>S] cluster in the electron transfer chain of the oxygen tolerant [Ni<span class="hlt">Fe</span>] hydrogenase from Aquifex aeolicus.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Pandelia, Maria-Eirini; Nitschke, Wolfgang; Infossi, Pascale; Giudici-Orticoni, Marie-Thérèse; Bill, Eckhard; Lubitz, Wolfgang</p> <p>2011-04-12</p> <p>Iron-sulfur clusters are versatile electron transfer cofactors, ubiquitous in metalloenzymes such as hydrogenases. In the oxygen-tolerant Hydrogenase I from Aquifex aeolicus such electron "wires" form a relay to a diheme cytb, an integral <span class="hlt">part</span> of a respiration pathway for the reduction of O(2) to water. Amino acid sequence comparison with oxygen-sensitive hydrogenases showed conserved binding motifs for three iron-sulfur clusters, the nature and properties of which were unknown so far. Electron paramagnetic resonance spectra exhibited complex signals that disclose interesting features and spin-coupling patterns; by redox titrations three iron-sulfur clusters were identified in their usual redox states, a [3<span class="hlt">Fe</span>4S] and two [4<span class="hlt">Fe</span>4S], but also a unique high-potential (HP) state was found. On the basis of (57)<span class="hlt">Fe</span> Mössbauer spectroscopy we attribute this HP form to a superoxidized state of the [4<span class="hlt">Fe</span>4S] center proximal to the [Ni<span class="hlt">Fe</span>] site. The unique environment of this cluster, characterized by a surplus cysteine coordination, is able to tune the redox potentials and make it compliant with the [4<span class="hlt">Fe</span>4S](3+) state. It is actually the first example of a biological [4<span class="hlt">Fe</span>4S] center that physiologically switches between 3+, 2+, and 1+ oxidation states within a very small potential range. We suggest that the (1 + /2+) redox couple serves the classical electron transfer reaction, whereas the superoxidation step is associated with a redox switch against oxidative stress.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018AIPC.1960p0025S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018AIPC.1960p0025S"><span>Homogenisation of the strain distribution in stretch formed <span class="hlt">parts</span> to improve <span class="hlt">part</span> properties</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Schmitz, Roman; Winkelmann, Mike; Bailly, David; Hirt, Gerhard</p> <p>2018-05-01</p> <p>Inhomogeneous strain and sheet thickness distributions can be observed in complex sheet metal <span class="hlt">parts</span> manufactured by stretch forming. In literature, this problem is solved by flexible clampings adapted to the <span class="hlt">part</span> geometry. In this paper, an approach, which does not rely on extensive tooling, is presented. The strain distribution in the sheet is influenced by means of hole patterns. Holes are introduced into the sheet area between clamping and <span class="hlt">part</span> next to areas where high strains are expected. When deforming the sheet, high strains are shifted out of the <span class="hlt">part</span> area. In a local area around the holes, high strains concentrate perpendicular to the drawing direction. Thus, high strains in the <span class="hlt">part</span> area are reduced and the strain distribution is homogenised. To verify this approach, an <span class="hlt">FE-model</span> of a stretch forming process of a conical <span class="hlt">part</span> is implemented in LS-Dyna. The <span class="hlt">model</span> is validated by corresponding experiments. In the first step, the positioning of the holes is applied manually based on the numerically determined strain distribution and experience. In order to automate the positioning of the holes, an optimisation method is applied in a second step. The presented approach implemented in LS-OPT uses the response surface method to identify the positioning and radius of the holes homogenising the strain in a defined area of the sheet. Due to nonlinear increase of computational complexity with increasing number of holes, the maximum number of holes is set to three. With both, the manual and the automated method, hole patterns were found which allow for a relative reduction of maximum strains and for a homogenisation of the strain distribution. Comparing the manual and automated positioning of holes, the pattern determined by automated optimisation shows better results in terms of homogenising the strain distribution.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018AAS...23221701W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018AAS...23221701W"><span>Fine-structure excitation of <span class="hlt">Fe</span> II and <span class="hlt">Fe</span> III due to collisions with electrons</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wan, Yier; Qi, Yueying; Favreau, Connor; Loch, Stuart; Stancil, P.; Ballance, Connor; McLaughlin, Brendan</p> <p>2018-06-01</p> <p>Atomic data of iron peak elements are of great importance in astronomical observations. Among all the ionization stages of iron, <span class="hlt">Fe</span> II and <span class="hlt">Fe</span> III are of particular importance because of the high cosmic abundance, relatively low ionization potential and complex open d-shell atomic structure. <span class="hlt">Fe</span> II and <span class="hlt">Fe</span> III emission are observed from nearly all classes of astronomical objects over a wide spectral range from the infrared to the ultraviolet. To meaningfully interpret these spectra, astronomers have to employ highly complex <span class="hlt">modeling</span> codes with reliable collision data to simulate the astrophysical observations. The major aim of this work is to provide reliable atomic data for diagnostics. We present new collision strengths and effective collisions for electron impact excitation of <span class="hlt">Fe</span> II and <span class="hlt">Fe</span> III for the forbidden transitions among the fine-structure levels of the ground terms. A very fine energy mesh is used for the collision strengths and the effective collision strengths are calculated over a wide range of electron temperatures of astrophysical importance (10-2000 K). The configuration interaction state wave functions are generated with a scaled Thomas-Fermi-Dirac-Amaldi (TFDA) potential, while the R-matrix plus intermediate coupling frame transformation (ICFT), Breit-Pauli R-matrix and Dirac R-matrix packages are used to obtain collision strengths. Influences of the different methods and configuration expansions on the collisional data are discussed. Comparison is made with earlier theoretical work and differences are found to occur at the low temperatures considered here.This work was funded by NASA grant NNX15AE47G.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_14");'>14</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li class="active"><span>16</span></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_16 --> <div id="page_17" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li class="active"><span>17</span></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="321"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/22611613-magnetostrictive-gmr-spin-valves-composite-fega-feco-free-layers','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/22611613-magnetostrictive-gmr-spin-valves-composite-fega-feco-free-layers"><span>Magnetostrictive GMR spin valves with composite <span class="hlt">FeGa/Fe</span>Co free layers</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Liu, Luping; Institute of Materials Science, School of Materials Science and Engineering, Shanghai University, Shanghai 200072; Zhan, Qingfeng, E-mail: zhanqf@nimte.ac.cn, E-mail: runweili@nimte.ac.cn</p> <p>2016-03-15</p> <p>We have fabricated strain-sensitive spin valves on flexible substrates by utilizing the large magnetostrictive <span class="hlt">Fe</span>Ga alloy to promote the strain sensitivity and the composite free layer of <span class="hlt">FeGa/Fe</span>Co to avoid the drastic reduction of giant magnetoresistance (GMR) ratio. This kind of spin valve (SV-<span class="hlt">FeGa/Fe</span>Co) displays a MR ratio about 5.9%, which is comparable to that of the conventional spin valve (SV-<span class="hlt">Fe</span>Co) with a single <span class="hlt">Fe</span>Co free layer. Different from the previously reported works on magnetostrictive spin valves, the SV-<span class="hlt">FeGa/Fe</span>Co displays an asymmetric strain dependent GMR behavior. Upon increasing the lateral strain, the MR ratio for the ascending branch decreases moremore » quickly than that for the descending branch, which is ascribed to the formation of a spiraling spin structure around the <span class="hlt">FeGa/Fe</span>Co interface under the combined influences of both magnetic field and mechanical strain. A strain sensitivity of GF = 7.2 was achieved at a magnetic bias field of -30 Oe in flexible SV-<span class="hlt">FeGa/Fe</span>Co, which is significantly larger than that of SV-<span class="hlt">Fe</span>Co.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017AGUFMOS53B1192V','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017AGUFMOS53B1192V"><span><span class="hlt">Fe</span>-C-S systematics in Bengal Fan sediments</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Volvoikar, S. P.; Mazumdar, A.; Goswami, H.; Pujari, S.; Peketi, A.</p> <p>2017-12-01</p> <p>Global biogeochemical cycles of iron, carbon and sulfur (<span class="hlt">Fe</span>-C-S) are interrelated. Sulfate reduction in marine sediments is the major factor controlling the cycling and burial of carbon, sulfur and iron. Organoclastic sulfate reduction and anaerobic oxidation of methane (AOM) are the two main processes responsible for sulfate reduction in marine sediments. The amount and reactivity of organic matter, iron minerals and concentrations of dissolved sulfide in pore water control the burial of iron sulfide and organic bound sulfur in marine sediments. Here we investigate the sulfidization process in a sediment core from the western <span class="hlt">part</span> of upper Bay of Bengal fan characterized by efficient burial of organic matter with siliclastic load. A 30 m long sediment core (MD 161/29, Lat. 170 18.04' N, Long. 870 22.56' E, water depth: 2434m) was collected onboard Marion Dufresne (May, 2007) and studied for <span class="hlt">Fe</span>-S speciation and organic matter characterization. Buffered dithionite extractable iron (<span class="hlt">Fe</span>D) varies from 0.71 to 1.43 wt % (Avg. 0.79 wt %). <span class="hlt">Fe</span>D represents <span class="hlt">Fe</span> oxides and oxyhydroxides mainly, ferrihydrite, lepidocrocite, goethite and hematite. Acid volatile sulfur (AVS) varies from 0.0015 to 0.63 wt % (avg: 0.058 wt %), while chromium reducible sulfur (CRS) varies from 0.00047 to 0.29 wt % (avg. 0.054 wt %). Based on the vertical distribution patterns of <span class="hlt">Fe</span>D, AVS and CRS, the core is divided into three zones, the lower (3000 to 1833 cm), middle (1833 to 398 cm) and upper (398 cm to surface) zones. <span class="hlt">Fe</span>D shows higher concentration in the lower zone. <span class="hlt">Fe</span>TR (<span class="hlt">Fe</span>Ox + <span class="hlt">Fe</span>D + <span class="hlt">Fe</span>CRS + <span class="hlt">Fe</span>AVS) also exhibit higher concentration in this zone, suggesting higher availability of reactive iron for iron sulfide precipitation. AVS, elemental sulfur, spikes of CRS and gradual enrichment of δ34SAVS and δ34SCRS with sharp peaks in-between is noted in the lower zone. The gradual enrichment of δ34SAVS and δ34SCRS is the outcome of late diagenetic pyritization with higher availability of sulfide</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/27208259','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/27208259"><span>A WRKY Transcription Factor Regulates <span class="hlt">Fe</span> Translocation under <span class="hlt">Fe</span> Deficiency.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Yan, Jing Ying; Li, Chun Xiao; Sun, Li; Ren, Jiang Yuan; Li, Gui Xin; Ding, Zhong Jie; Zheng, Shao Jian</p> <p>2016-07-01</p> <p>Iron (<span class="hlt">Fe</span>) deficiency affects plant growth and development, leading to reduction of crop yields and quality. Although the regulation of <span class="hlt">Fe</span> uptake under <span class="hlt">Fe</span> deficiency has been well studied in the past decade, the regulatory mechanism of <span class="hlt">Fe</span> translocation inside the plants remains unknown. Here, we show that a WRKY transcription factor WRKY46 is involved in response to <span class="hlt">Fe</span> deficiency. Lack of WRKY46 (wrky46-1 and wrky46-2 loss-of-function mutants) significantly affects <span class="hlt">Fe</span> translocation from root to shoot and thus causes obvious chlorosis on the new leaves under <span class="hlt">Fe</span> deficiency. Gene expression analysis reveals that expression of a nodulin-like gene (VACUOLAR IRON TRANSPORTER1-LIKE1 [VITL1]) is dramatically increased in wrky46-1 mutant. VITL1 expression is inhibited by <span class="hlt">Fe</span> deficiency, while the expression of WRKY46 is induced in the root stele. Moreover, down-regulation of VITL1 expression can restore the chlorosis phenotype on wrky46-1 under <span class="hlt">Fe</span> deficiency. Further yeast one-hybrid and chromatin immunoprecipitation experiments indicate that WRKY46 is capable of binding to the specific W-boxes present in the VITL1 promoter. In summary, our results demonstrate that WRKY46 plays an important role in the control of root-to-shoot <span class="hlt">Fe</span> translocation under <span class="hlt">Fe</span> deficiency condition via direct regulation of VITL1 transcript levels. © 2016 American Society of Plant Biologists. All Rights Reserved.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014AGUFM.V33C4886K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014AGUFM.V33C4886K"><span>High δ56<span class="hlt">Fe</span> values in Samoan basalts</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Konter, J. G.; Pietruszka, A. J.; Hanan, B. B.; Finlayson, V.</p> <p>2014-12-01</p> <p><span class="hlt">Fe</span> isotope fractionation spans ~0-0.4 permil in igneous systems, which cannot all be attributed to variable source compositions since peridotites barely overlap these compositions. Other processes may fractionate <span class="hlt">Fe</span> isotopes such as variations in the degree of partial melting, magmatic differentiation, fluid addition related to the final stages of melt evolution, and kinetic fractionation related to diffusion. An important observation in igneous systems is the trend of increasing <span class="hlt">Fe</span> isotope values against an index of magmatic fractionation (e.g. SiO2; [1]). The data strongly curve from δ56<span class="hlt">Fe</span> >0.3 permil for SiO2 >70 wt% down to values around 0.09 permil from ~65 wt% down to 40 wt% SiO2 of basalts. However, ocean island basalts (OIBs) have a slightly larger δ56<span class="hlt">Fe</span> variability than mid ocean ridge basalts (MORBs; [e.g. 2]). We present <span class="hlt">Fe</span> isotope data on samples from the Samoan Islands (OIB) that have unusually high δ56<span class="hlt">Fe</span> values for their SiO2 content. We rule out alteration by using fresh samples, and further test for the effects of magmatic processes on the δ56<span class="hlt">Fe</span> values. In order to <span class="hlt">model</span> the largest possible fractionation, unusually small degrees of melting with extreme fractionation factors are <span class="hlt">modeled</span> with fractional crystallization of olivine alone, but such processing fails to fractionate the <span class="hlt">Fe</span> isotopes to the observed values. Moreover, Samoan lavas likely also fractionated clinopyroxene, and its lower fractionation factor would limit the final δ56<span class="hlt">Fe</span> value of the melt. We therefore suggest the mantle source of Samoan lavas must have had unusually high δ56<span class="hlt">Fe</span>. However, there is no clear correlation with the highly radiogenic isotope signatures that reflect the unique source compositions of Samoa. Instead, increasing melt extraction correlates with lower δ56<span class="hlt">Fe</span> values in peridotites assumed to be driven by the preference for the melt phase by heavy <span class="hlt">Fe</span>3+, while high values may be related to metasomatism [3]. The latter would be in line with metasomatized</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/19689133','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/19689133"><span>Chemical evaluation of HBED/<span class="hlt">Fe</span>(3+) and the novel HJB/<span class="hlt">Fe</span>(3+) chelates as fertilizers to alleviate iron chlorosis.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>López-Rayo, Sandra; Hernández, Diana; Lucena, Juan J</p> <p>2009-09-23</p> <p>Iron chelates such as ethylenediamine-N,N'-bis(2-hydroxyphenylacetic) acid (o,o-EDDHA) and their analogues are the most efficient soil fertilizers to treat iron chlorosis in plants growing in calcareous soil. A new chelating agent, HJB (N,N'-bis(2-hydroxy-5-methylphenyl)ethylendiamine-N,N'-diacetic acid) may be an alternative to o,o-EDDHA since its synthesis yields a purer product, but its chemical behavior and efficiency as chlorosis corrector should be evaluated. In this research, a known analogous HBED (N,N'-bis(2-hydroxyphenyl)ethylendiamine-N,N'-diacetic acid) has also been considered. First, an ion-pair high performance liquid chromatography (HPLC) method has been tested for the HJB/<span class="hlt">Fe</span>(3+) and HBED/<span class="hlt">Fe</span>(3+) determination. The ability of HJB and HBED to maintain <span class="hlt">Fe</span> in solution has been compared with respect to o,o-EDDHA. Theoretical <span class="hlt">modelization</span> for HBED and HJB in agronomic conditions has been done after the determination of the protonation and Ca(II), Mg(II), <span class="hlt">Fe</span>(III), and Cu(II) stability constants for HJB. Also, batch interaction experiments with soils and soil materials have been conducted. According to our results, HJB/<span class="hlt">Fe</span>(3+) and HBED/<span class="hlt">Fe</span>(3+) present high stability, even when competing cations (Cu(2+), Ca(2+)) are present, and have low reactivity with soils and soil components. The chelating agent HJB dissolves a higher amount of <span class="hlt">Fe</span> than o,o-EDDHA, and it seems as effective as o,o-EDDHA in keeping <span class="hlt">Fe</span> in solution. These results indicate that these chelates may be very efficient products to correct <span class="hlt">Fe</span> chlorosis, and additional plant experiments should demonstrate plants' ability to assimilate <span class="hlt">Fe</span> from HJB/<span class="hlt">Fe</span>(3+) and HBED/<span class="hlt">Fe</span>(3+).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015PhRvB..91i4109S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015PhRvB..91i4109S"><span>Polaronic deformation at the <span class="hlt">Fe</span>2+/3 + impurity site in <span class="hlt">Fe</span>:LiNbO3 crystals</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Sanson, A.; Zaltron, A.; Argiolas, N.; Sada, C.; Bazzan, M.; Schmidt, W. G.; Sanna, S.</p> <p>2015-03-01</p> <p>Iron doped LiNbO3 crystals with different iron valence states are investigated. An extended x-ray absorption fine structure (EXAFS) spectroscopy study highlights evident changes in the local structure around iron that can be ascribed to the presence of small polarons. In particular, when a <span class="hlt">Fe</span>3+ replaced a Li ion, the oxygen octahedron shrinked with respect to the pure material, with an average iron-oxygen bond value very similar to that of <span class="hlt">Fe</span>2O3 hematite. When adding an electron, it localizes at the <span class="hlt">Fe</span> site in a configuration very close to the atomic <span class="hlt">Fe</span> d orbitals, inducing a relaxation of the oxygen cage. The same system was <span class="hlt">modelled</span> by spin-polarized density functional theory (DFT). Several local as well as hybrid exchange-correlation functionals were probed on the bulk LiNbO3 structural properties. The computation is then extended to the case of hematite and finally to the <span class="hlt">Fe</span> defect in LiNbO3. The calculations reproduced with good accuracy the large lattice relaxation of the oxygen ligands associated to the electronic capture at the <span class="hlt">Fe</span> center that can be interpreted as due to the polaron formation. The calculations reproduce satisfactorily the available EXAFS data, and allow for the estimation of the polaron energies and the optical properties of the defect.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://pubs.er.usgs.gov/publication/70016549','USGSPUBS'); return false;" href="https://pubs.er.usgs.gov/publication/70016549"><span>Enzymatic versus nonenzymatic mechanisms for <span class="hlt">Fe</span>(III) reduction in aquatic sediments</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Lovley, D.R.; Phillips, E.J.P.; Lonergan, D.J.</p> <p>1991-01-01</p> <p>The potential for nonenzymatic reduction of <span class="hlt">Fe</span>(III) either by organic compounds or by the development of a low redox potential during microbial metabolism was compared with direct, enzymatic <span class="hlt">Fe</span>(III) reduction by <span class="hlt">Fe</span>(III)-reducing microorganisms. At circumneutral pH, very few organic compounds nonenzymatically reduced <span class="hlt">Fe</span>(III). In contrast, in the presence of the appropriate <span class="hlt">Fe</span>(IH)-reducing microorganisms, most of the organic compounds examined could be completely oxidized to carbon dioxide with the reduction of <span class="hlt">Fe</span>(III). Even for those organic compounds that could nonenzymatically reduce <span class="hlt">Fe</span>(III), microbial <span class="hlt">Fe</span>(III) reduction was much more extensive. The development of a low redox potential during microbial fermentation did not result in nonenzymatic <span class="hlt">Fe</span>(III) reduction. <span class="hlt">Model</span> organic compounds were readily oxidized in <span class="hlt">Fe</span>(III)-reducing aquifer sediments, but not in sterilized sediments. These results suggest that microorganisms enzymatically catalyze most of the <span class="hlt">Fe</span>(III) reduction in the <span class="hlt">Fe</span>(III) reduction zone of aquatic sediments and aquifers.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017PhRvB..96s5120L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017PhRvB..96s5120L"><span>Soft x-ray absorption spectroscopy study of the electronic structures of the Mn<span class="hlt">Fe</span> Prussian blue analogs (RbxBay) Mn[3 -(x +2 y )]/2[<span class="hlt">Fe</span> (CN) 6] H2O</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Lee, Eunsook; Seong, Seungho; Kim, Hyun Woo; Kim, D. H.; Thakur, Nidhi; Yusuf, S. M.; Kim, Bongjae; Min, B. I.; Kim, Younghak; Kim, J.-Y.; de Groot, F. M. F.; Kang, J.-S.</p> <p>2017-11-01</p> <p>The electronic structures of Prussian blue analog (RbxBay) Mn[3 -(x +2 y )]/2[<span class="hlt">Fe</span> (CN) 6] cyanides have been investigated by employing soft x-ray absorption spectroscopy (XAS) and magnetic circular dichroism (XMCD) at the <span class="hlt">Fe</span> and Mn L (2 p ) edges. The measured XAS spectra have been analyzed with the configuration-interaction (CI) cluster <span class="hlt">model</span> calculations. The valence states of the <span class="hlt">Fe</span> and Mn ions are found to be <span class="hlt">Fe</span>2 +-<span class="hlt">Fe</span>3 + mixed valent, with an average valency of v (<span class="hlt">Fe</span> )˜2.8 and nearly divalent (Mn2 +), respectively. Our Mn/<span class="hlt">Fe</span> 2 p XMCD study supports that Mn2 + ions are in the high-spin states while <span class="hlt">Fe</span>2 +-<span class="hlt">Fe</span>3 + ions are in the low-spin states. The <span class="hlt">Fe</span> and Mn 2 p XAS spectra are found to be essentially the same for 80 ≤T ≤ 300 K, suggesting that a simple charge transfer upon cooling from <span class="hlt">Fe</span>3 +-CN -Mn2 + to <span class="hlt">Fe</span>2 +-CN -Mn3 + does not occur in (RbxBay) Mn[3 -(x +2 y )]/2[<span class="hlt">Fe</span> (CN) 6] . According to the CI cluster <span class="hlt">model</span> analysis, it is necessary to take into account both the ligand-to-metal charge transfer and the metal-to-ligand charge transfer in describing <span class="hlt">Fe</span> 2 p XAS, while the effect of charge transfer is negligible in describing Mn 2 p XAS. The CI cluster <span class="hlt">model</span> analysis also shows that the trivalent <span class="hlt">Fe</span>3 + ions have a strong covalent bonding with the C ≡N ligands and are under a large crystal-field energy of 10 D q ˜3 eV, in contrast to the weak covalency effect and a small 10 D q ˜0.6 eV for the divalent Mn2 + ions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018MS%26E..345a2010U','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018MS%26E..345a2010U"><span>Crystal-growth kinetics of magnetite (<span class="hlt">Fe</span>3O4) nanoparticles with Ostwald Ripening <span class="hlt">Model</span> approach</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Utami, S. P.; Fadli, A.; Sari, E. O.; Addabsi, A. S.</p> <p>2018-04-01</p> <p>Magnetite (<span class="hlt">Fe</span>3O4) nanoparticles is a magnetic nanomaterial that have potential properties to be applied as drug delivery The purpose of this study was to determine the influence of time and temperature synthesis of magnetie characteristics and determine its crystal growth kinetics <span class="hlt">model</span> with Ostwald ripening <span class="hlt">model</span> approach. Magnetite nanoparticles synthesized from <span class="hlt">Fe</span>Cl3, citrate, urea and polyethylene glycol with hydrothermal method at 180, 200 and 220 °C for 1,3,5,7,9 and 12 hours. Characterization by X-ray Diffraction (XRD) indicated that magnetite formed at temperatures of 200 and 220 °C. Magnetite crystallite diameter obtained was 10-29 nm. Characterization by Transmission Electron Mycroscope (TEM) shows that magnetite nanoparticles have uniform size and non-agglomerated. Core-shell shaped particles formed at 200 °C and 220 °C for 3 hours. Irregular shape obtained at 220 °C for 12 hour synthesis with particle diameter about 120 nm. Characterization using Vibrating Sample Magnetometer (VSM) shown that magnetite has super paramagnetism behaviour with the highest saturation magnetization (Ms) was 70.27 emu/g. magnetite crystal growth data at temperature of 220 °C can be fitted by Ostwald ripening growth <span class="hlt">model</span> with growth controlled by the dissolution of surface reaction (n≈4) with the percent error of 2.53%.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018JPhD...51h5003A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018JPhD...51h5003A"><span>Influence of <span class="hlt">Fe</span> doped on the magnetocaloric behavior of La_{{2}/{3}} Ca_{{1}/{3}} Mn1-x <span class="hlt">Fe</span> x O3 compounds: a Monte Carlo simulation</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Alzate-Cardona, J. D.; Barco-Rios, H.; Restrepo-Parra, E.</p> <p>2018-02-01</p> <p>The magnetocaloric behavior of La{2/{3}} Ca{1/{3}} Mn1-x <span class="hlt">Fe</span> x O3 for x  =  0.00, 0.02, 0.03, 0.05, 0.07, 0.08 and 0.10 under the influence of an external magnetic field was simulated and analyzed. Simulations were carried out using the Monte Carlo method and the classical Heisenberg <span class="hlt">model</span> under the Metropolis algorithm. These mixed valence manganites are characterized by having three types of magnetic ions corresponding to Mn4+≤ft(S=\\frac{3}{2}\\right) , which are bonded with Ca2+ , and Mneg3+ and Mneg\\prime3+ (S=2) , related to La3+ . The <span class="hlt">Fe</span> ions were randomly included, replacing Mn ions. With this <span class="hlt">model</span>, the magnetic entropy change, Δ S , in an isothermal process was determined. -Δ Sm showed maximum peaks around the paramagnetic-ferromagnetic transition temperature, which depends on <span class="hlt">Fe</span> doping. Relative cooling power was computed for different <span class="hlt">Fe</span> concentrations varying the magnetic applied field. Our <span class="hlt">model</span> and results show that the <span class="hlt">Fe</span> doping decreases the magnetocaloric effect in the La{2/{3}} Ca{1/{3}} Mn1-x <span class="hlt">Fe</span> x O3, making this a bad candidate for magnetic refrigeration. The strong dependence of the magnetocaloric behavior on <span class="hlt">Fe</span> doping and the external magnetic field in La{2/{3}} Ca{1/{3}} Mn1-x <span class="hlt">Fe</span> x O3 can boost these materials for the future technological applications.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3371588','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3371588"><span>Ligand-hole localization in oxides with unusual valence <span class="hlt">Fe</span></span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Chen, Wei-Tin; Saito, Takashi; Hayashi, Naoaki; Takano, Mikio; Shimakawa, Yuichi</p> <p>2012-01-01</p> <p>Unusual high-valence states of iron are stabilized in a few oxides. A-site-ordered perovskite-structure oxides contain such iron cations and exhibit distinct electronic behaviors at low temperatures, e.g. charge disproportionation (4<span class="hlt">Fe</span>4+ → 2<span class="hlt">Fe</span>3+ + 2<span class="hlt">Fe</span>5+) in CaCu3<span class="hlt">Fe</span>4O12 and intersite charge transfer (3Cu2+ + 4<span class="hlt">Fe</span>3.75+ → 3Cu3+ + 4<span class="hlt">Fe</span>3+) in LaCu3<span class="hlt">Fe</span>4O12. Here we report the synthesis of solid solutions of CaCu3<span class="hlt">Fe</span>4O12 and LaCu3<span class="hlt">Fe</span>4O12 and explain how the instabilities of their unusual valence states of iron are relieved. Although these behaviors look completely different from each other in simple ionic <span class="hlt">models</span>, they can both be explained by the localization of ligand holes, which are produced by the strong hybridization of iron d and oxygen p orbitals in oxides. The localization behavior in the charge disproportionation of CaCu3<span class="hlt">Fe</span>4O12 is regarded as charge ordering of the ligand holes, and that in the intersite charge transfer of LaCu3<span class="hlt">Fe</span>4O12 is regarded as a Mott transition of the ligand holes. PMID:22690318</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1999SPIE.3792..226Y','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1999SPIE.3792..226Y"><span>Containerless solidification of Bi<span class="hlt">Fe</span>O3 oxide under microgravity</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Yu, Jianding; Arai, Yasutomo; Koshikawa, Naokiyo; Ishikawa, Takehito; Yoda, Shinichi</p> <p>1999-07-01</p> <p>Containerless solidification of Bi<span class="hlt">Fe</span>O3 oxide has been carried out under microgravity with Electrostatic Levitation Furnace (ELF) aboard on the sounding rocket (TR-IA). It is a first containerless experiment using ELF under microgravity for studying the solidification of oxide insulator material. Spherical Bi<span class="hlt">Fe</span>O3 sample with diameter of 5mm was heated by two lasers in oxygen and nitrogen mixing atmosphere, and the sample position by electrostatic force under pinpoint <span class="hlt">model</span> and free drift <span class="hlt">model</span>. In order to compare the solidification behavior in microgravity with on ground, solidification experiments of Bi<span class="hlt">Fe</span>O3 in crucible and drop tube were carried out. In crucible experiment, it was very difficult to get single Bi<span class="hlt">Fe</span>O3 phase, because segregation of <span class="hlt">Fe</span>2O3 occured very fast and easily. In drop tube experiment, fine homogeneous Bi<span class="hlt">Fe</span>O3 microstructure was obtained in a droplet about 300 μm. It implies that containerless processing can promote the phase selection in solidification. In microgravity experiment, because the heating temperature was lower than that of estimated, the sample was heated into <span class="hlt">Fe</span>2O3+liquid phase region. <span class="hlt">Fe</span>2O3 single crystal grew on the surface of the spherical sample, whose sample was clearly different from that observed in ground experiments.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012PhRvB..86r4511S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012PhRvB..86r4511S"><span>Phase relations in Kx<span class="hlt">Fe</span>2-ySe2 and the structure of superconducting Kx<span class="hlt">Fe</span>2Se2 via high-resolution synchrotron diffraction</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Shoemaker, Daniel P.; Chung, Duck Young; Claus, Helmut; Francisco, Melanie C.; Avci, Sevda; Llobet, Anna; Kanatzidis, Mercouri G.</p> <p>2012-11-01</p> <p>Superconductivity in iron selenides has experienced a rapid growth, but not without major inconsistencies in the reported properties. For alkali-intercalated iron selenides, even the structure of the superconducting phase is a subject of debate, in <span class="hlt">part</span> because the onset of superconductivity is affected much more delicately by stoichiometry and preparation than in cuprate or pnictide superconductors. If high-quality, pure, superconducting intercalated iron selenides are ever to be made, the intertwined physics and chemistry must be explained by systematic studies of how these materials form and by and identifying the many coexisting phases. To that end, we prepared pure K2<span class="hlt">Fe</span>4Se5 powder and superconductors in the Kx<span class="hlt">Fe</span>2-ySe2 system, and examined differences in their structures by high-resolution synchrotron and single-crystal x-ray diffraction. We found four distinct phases: semiconducting K2<span class="hlt">Fe</span>4Se5, a metallic superconducting phase Kx<span class="hlt">Fe</span>2Se2 with x ranging from 0.38 to 0.58, the phase KFe1.6Se2 with full K occupancy and no <span class="hlt">Fe</span> vacancy ordering, and a oxidized phase K0.51(5)<span class="hlt">Fe</span>0.70(2)Se that forms the PbClF structure upon exposure to moisture. We find that the vacancy-ordered phase K2<span class="hlt">Fe</span>4Se5 does not become superconducting by doping, but the distinct iron-rich minority phase Kx<span class="hlt">Fe</span>2Se2 precipitates from single crystals upon cooling from above the vacancy ordering temperature. This coexistence of separate metallic and semiconducting phases explains a broad maximum in resistivity around 100 K. Further studies to understand the solubility of excess <span class="hlt">Fe</span> in the Kx<span class="hlt">Fe</span>2-ySe2 structure will shed light on the maximum fraction of superconducting Kx<span class="hlt">Fe</span>2Se2 that can be obtained by solid state synthesis.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/1290397-fe-ii-sorption-pyrophyllite-effect-structural-fe-iii-impurity-pyrophyllite-nature-layered-double-hydroxide-ldh-secondary-mineral-formation','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/1290397-fe-ii-sorption-pyrophyllite-effect-structural-fe-iii-impurity-pyrophyllite-nature-layered-double-hydroxide-ldh-secondary-mineral-formation"><span><span class="hlt">Fe</span>(II) sorption on pyrophyllite: Effect of structural <span class="hlt">Fe</span>(III) (impurity) in pyrophyllite on nature of layered double hydroxide (LDH) secondary mineral formation</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Starcher, Autumn N.; Li, Wei; Kukkadapu, Ravi K.</p> <p></p> <p><span class="hlt">Fe</span>(II)-Al(III)-LDH (layered double hydroxide) phases have been shown to form from reactions of aqueous <span class="hlt">Fe</span>(II) with <span class="hlt">Fe</span>-free Al-bearing minerals (phyllosilicate/clays and Al-oxides). To our knowledge, the effect of small amounts of structural <span class="hlt">Fe</span>(III) impurities in “neutral” clays on such reactions, however, were not studied. In this study to understand the role of structural <span class="hlt">Fe</span>(III) impurity in clays, laboratory batch studies with pyrophyllite (10 g/L), an Al-bearing phyllosilicate, containing small amounts of structural <span class="hlt">Fe</span>(III) impurities and 0.8 mM and 3 mM <span class="hlt">Fe</span>(II) (both natural and enriched in 57<span class="hlt">Fe</span>) were carried out at pH 7.5 under anaerobic conditions (4% H2 – 96%more » N2 atmosphere). Samples were taken up to 4 weeks for analysis by <span class="hlt">Fe</span>-X-ray absorption spectroscopy and 57<span class="hlt">Fe</span> Mössbauer spectroscopy. In addition to the precipitation of <span class="hlt">Fe</span>(II)-Al(III)-LDH phases as observed in earlier studies with pure minerals (no <span class="hlt">Fe</span>(III) impurities in the minerals), the analyses indicated formation of small amounts of <span class="hlt">Fe</span>(III) containing solid(s), most probably hybrid a <span class="hlt">Fe(II)-Al(III)/Fe</span>(III)-LDH phase. The mechanism of <span class="hlt">Fe</span>(II) oxidation was not apparent but most likely was due to interfacial electron transfer from the sorbed <span class="hlt">Fe</span>(II) to the structural <span class="hlt">Fe</span>(III) and/or surface-sorption-induced electron-transfer from the sorbed <span class="hlt">Fe</span>(II) to the clay lattice. Increase in the <span class="hlt">Fe</span>(II)/Al ratio of the LDH with reaction time further indicated the complex nature of the samples. This research provides evidence for the formation of both <span class="hlt">Fe</span>(II)-Al(III)-LDH and <span class="hlt">Fe(II)-Fe</span>(III)/Al(III)-LDH-like phases during reactions of <span class="hlt">Fe</span>(II) in systems that mimic the natural environments. Better understanding <span class="hlt">Fe</span> phase formation in complex laboratory studies will improve <span class="hlt">models</span> of natural redox systems.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/22489655-sustained-magnetization-oscillations-polyaniline-fe-sub-sub-nanocomposites','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/22489655-sustained-magnetization-oscillations-polyaniline-fe-sub-sub-nanocomposites"><span>Sustained magnetization oscillations in polyaniline-<span class="hlt">Fe</span>{sub 3}O{sub 4} nanocomposites</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Araújo, A. C. V. de; Rodrigues, A. R., E-mail: ricalde@df.ufpe.br; Machado, F. L. A.</p> <p>2015-09-28</p> <p>We report experiments with polyaniline-<span class="hlt">Fe</span>{sub 3}O{sub 4} (PANI-<span class="hlt">Fe</span>{sub 3}O{sub 4}) nanocomposites synthesized under several different conditions. With a reaction carried out at room temperature and assisted by intense ultra-violet (UV) irradiation, we observe sustained oscillations in the magnetization with a period of about 25 min. The oscillations are interpreted as the result of an oscillatory chemical reaction in which <span class="hlt">part</span> of the <span class="hlt">Fe</span>{sup +2} ions of magnetite, <span class="hlt">Fe</span>{sub 3}O{sub 4}, are oxidized by the UV irradiation to form <span class="hlt">Fe</span>{sup +3} so that a fraction of the magnetite content transforms into maghemite, γ-<span class="hlt">Fe</span>{sub 2}O{sub 3}. Then, <span class="hlt">Fe</span>{sup +3} ions at themore » nanoparticle surfaces are reduced and transformed back into <span class="hlt">Fe</span>{sup +2}, when acting as an oxidizing agent for polyaniline in the polymerization process. Since maghemite has smaller magnetization than magnetite, the oscillating chemical reaction results in the oscillatory magnetization. The observations are interpreted with the Lotka-Volterra nonlinear coupled equations with parameters that can be adjusted to fit very well the experimental data.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2011-title12-vol6/pdf/CFR-2011-title12-vol6-part704-appA.pdf','CFR2011'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2011-title12-vol6/pdf/CFR-2011-title12-vol6-part704-appA.pdf"><span>12 CFR Appendix A to <span class="hlt">Part</span> 704 - <span class="hlt">Model</span> Forms</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-01-01</p> <p>... 12 Banks and Banking 6 2011-01-01 2011-01-01 false <span class="hlt">Model</span> Forms A Appendix A to <span class="hlt">Part</span> 704 Banks and... Pt. 704, App. A Appendix A to <span class="hlt">Part</span> 704—<span class="hlt">Model</span> Forms This appendix contains sample forms intended for... corporate credit union. (8) Paid-in capital is perpetual maturity and noncumulative dividend. I have read...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title12-vol6/pdf/CFR-2010-title12-vol6-part704-appA.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title12-vol6/pdf/CFR-2010-title12-vol6-part704-appA.pdf"><span>12 CFR Appendix A to <span class="hlt">Part</span> 704 - <span class="hlt">Model</span> Forms</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-01-01</p> <p>... 12 Banks and Banking 6 2010-01-01 2010-01-01 false <span class="hlt">Model</span> Forms A Appendix A to <span class="hlt">Part</span> 704 Banks and... Pt. 704, App. A Appendix A to <span class="hlt">Part</span> 704—<span class="hlt">Model</span> Forms This appendix contains sample forms intended for... corporate credit union. (8) Paid-in capital is perpetual maturity and noncumulative dividend. I have read...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/29726568','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/29726568"><span>[<span class="hlt">FeFe</span>]-Hydrogenases: recent developments and future perspectives.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Wittkamp, F; Senger, M; Stripp, S T; Apfel, U-P</p> <p>2018-06-08</p> <p>[<span class="hlt">FeFe</span>]-Hydrogenases are the most efficient enzymes for catalytic hydrogen turnover. Their H2 production efficiency is hitherto unrivalled. However, functional details of the catalytic machinery and possible modes of application are discussed controversially. The incorporation of synthetically modified cofactors and utilization of semi-artificial enzymes only recently allowed us to shed light on key steps of the catalytic cycle. Herein, we summarize the essential findings regarding the redox chemistry of [<span class="hlt">FeFe</span>]-hydrogenases and discuss their catalytic hydrogen turnover. We furthermore will give an outlook on potential research activities and exploit the utilization of synthetic cofactor mimics.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017ACP....17.4177U','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017ACP....17.4177U"><span>Measuring <span class="hlt">Fe</span>O variation using astronomical spectroscopic observations</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Unterguggenberger, Stefanie; Noll, Stefan; Feng, Wuhu; Plane, John M. C.; Kausch, Wolfgang; Kimeswenger, Stefan; Jones, Amy; Moehler, Sabine</p> <p>2017-03-01</p> <p>Airglow emission lines of OH, O2, O and Na are commonly used to probe the MLT (mesosphere-lower thermosphere) region of the atmosphere. Furthermore, molecules like electronically excited NO, NiO and <span class="hlt">Fe</span>O emit a (pseudo-) continuum. These continua are harder to investigate than atomic emission lines. So far, limb-sounding from space and a small number of ground-based low-to-medium resolution spectra have been used to measure <span class="hlt">Fe</span>O emission in the MLT. In this study the medium-to-high resolution echelle spectrograph X-shooter at the Very Large Telescope (VLT) in the Chilean Atacama Desert (24°37' S, 70°24' W; 2635 m) is used to study the <span class="hlt">Fe</span>O pseudo-continuum in the range from 0.5 to 0.72 µm based on 3662 spectra. Variations of the <span class="hlt">Fe</span>O spectrum itself, as well as the diurnal and seasonal behaviour of the <span class="hlt">Fe</span>O and Na emission intensities, are reported. These airglow emissions are linked by their common origin, meteoric ablation, and they share O3 as a common reactant. Major differences are found in the main emission peak of the <span class="hlt">Fe</span>O airglow spectrum between 0.58 and 0.61 µm, compared with a theoretical spectrum. The <span class="hlt">Fe</span>O and Na airglow intensities exhibit a similar nocturnal variation and a semi-annual seasonal variation with equinoctial maxima. This is satisfactorily reproduced by a whole atmosphere chemistry climate <span class="hlt">model</span>, if the quantum yields for the reactions of <span class="hlt">Fe</span> and Na with O3 are 13 ± 3 and 11 ± 2 % respectively. However, a comparison between the <span class="hlt">modelled</span> O3 in the upper mesosphere and measurements of O3 made with the SABER satellite instrument suggests that these quantum yields may be a factor of ˜ 2 smaller.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017AIPC.1862c0040A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017AIPC.1862c0040A"><span><span class="hlt">Modeling</span> of full-Heusler alloys within tight-binding approximation: Case study of <span class="hlt">Fe</span>2MnAl</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Azhar, A.; Majidi, M. A.; Nanto, D.</p> <p>2017-07-01</p> <p>Heusler alloys have been known for about a century, and predictions of magnetic moment values using Slater-Pauling rule have been successful for many such materials. However, such a simple counting rule has been found not to always work for all Heusler alloys. For instance, <span class="hlt">Fe</span>2CuAl has been found to have magnetic moment of 3.30 µB per formula unit although the Slater-Pauling rule suggests the value of 2 µB. On the other hand, a recent experiment shows that a non-stoichiometric Heusler compound <span class="hlt">Fe</span>2Mn0.5Cu0.5Al possesses magnetic moment of 4 µB, closer to the Slater-Pauling prediction for the stoichiometric compound. Such discrepancies signify that the theory to predict the magnetic moment of Heusler alloys in general is still far from being complete. Motivated by this issue, we propose to do a theoretical study on a full-Heusler alloy <span class="hlt">Fe</span>2MnAl to understand the formation of magnetic moment microscopically. We <span class="hlt">model</span> the system by constructing a density-functional-theory-based tight-binding Hamiltonian and incorporating Hubbard repulsive as well as spin-spin interactions for the electrons occupying the d-orbitals. Then, we solve the <span class="hlt">model</span> using Green's function approach, and treat the interaction terms within the mean-field approximation. At this stage, we aim to formulate the computational algorithm for the overall calculation process. Our final goal is to compute the total magnetic moment per unit cell of this system and compare it with the experimental data.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_15");'>15</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li class="active"><span>17</span></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_17 --> <div id="page_18" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li class="active"><span>18</span></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="341"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20070020263','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20070020263"><span>Precision <span class="hlt">Fe</span> K-Alpha and <span class="hlt">Fe</span> K-Beta Line Spectroscopy of the Seyfert 1.9 Galaxy NGC 2992 with Suzaku</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Yaqoob, Tahir; Murphy, Kendrah D.; Griffiths, Richard E.; Haba, Yoshito; Inoue, Hajime; Itoh, Takeshi; Kelley, Richard; Kokubun, Motohide; Markowitz, Alex; Mushotzky, Richard; <a style="text-decoration: none; " href="javascript:void(0); " onClick="displayelement('author_20070020263'); toggleEditAbsImage('author_20070020263_show'); toggleEditAbsImage('author_20070020263_hide'); "> <img style="display:inline; width:12px; height:12px; " src="images/arrow-up.gif" width="12" height="12" border="0" alt="hide" id="author_20070020263_show"> <img style="width:12px; height:12px; display:none; " src="images/arrow-down.gif" width="12" height="12" border="0" alt="hide" id="author_20070020263_hide"></p> <p>2006-01-01</p> <p>We present detailed time-averaged X-ray spectroscopy in the 0.5-10 keV band of the Seyfert 1.9 galaxy NGC 2992 with the Suzaku X-ray Imaging Spectrometers (XIS). The source had a factor approximately 3 higher 2-10 keV flux (approximately 1.2 x l0(exp -11) erg per square cm per s) than the historical minimum and a factor approximately 7 less than the historical maximum. The XIS spectrum of NGC 2992 can be described by several components. There is a primary continuum, <span class="hlt">modeled</span> as a power-law with a photon index of Gamma = 1.57(sup +0.06) (sup -0.03) that is obscured by a Compton-thin absorber with a column density of 8.01(sup +0.6) (sup -0.5)x l0 (exp 21) per square cm. . There is another, weaker, unabsorbed power-law component (<span class="hlt">modeled</span> with the same slope as the primary), that is likely to be due to the primary continuum being electron-scattered into our line-of-sight by a region extended on a scale of hundreds of parsecs. We measure the Thomson depth of the scattering zone to be Tau = 0.072 +/- 0.021. An optically-thin thermal continuum emission component, which probably originates in the same extended region, is included in the <span class="hlt">model</span> and yields a temperature and luminosity of KT = 0.656(sup +0.088) (sup -0.0.61) keV and approximately 1.2 +/- 0.4 x l0 (exp 40) erg per s respectively. We detect an <span class="hlt">Fe</span> K emission complex which we <span class="hlt">model</span> with broad and narrow lines and we show that the intensities of the two components are decoupled at a confidence level > 3 sigma. The broad <span class="hlt">Fe</span> K alpha line has an equivalent width of 118(sup +32) (sup -61) eV and could originate in an accretion disk (with inclination angle greater than approximately 30 deg) around the putative central black hole. The narrow <span class="hlt">Fe</span> K alpha line has an equivalent width of 1632(sup +47) (sup -26) eV and is unresolved (FWHM < 4630 km per s) and likely originates in distant matter. The absolute flux in the narrow line implies that the column density out of the line-of-sight could be much higher than measured in</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/15461167','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/15461167"><span>Reduction of aqueous chromate by <span class="hlt">Fe(II)/Fe</span>(III) carbonate green rust: kinetic and mechanistic studies.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Legrand, Ludovic; El Figuigui, Alaaeddine; Mercier, Florence; Chausse, Annie</p> <p>2004-09-01</p> <p>This work describes the heterogeneous reaction between <span class="hlt">Fe</span>II in carbonate green rust and aqueous chromate, in NaHCO3 solutions at 25 degrees C, and at pH values of 9.3-9.6. Evidence for reduction of CrVI to CrIII and concomitant solid-state oxidation of lattice <span class="hlt">Fe</span>II to <span class="hlt">Fe</span>III was found from <span class="hlt">Fe</span>II titration and from structural analysis of the solids using FTIR, XRD, SEM, and XPS methods. Results indicate the formation of ferric oxyhydroxycarbonate and the concomitant precipitation of CrIII monolayers at the surface of the iron compound that induce passivation effects and progressive rate limitations. The number of CrIII monolayers formed at the completion of the reaction depends on [<span class="hlt">Fe</span>II]t=0, the molar concentration of <span class="hlt">Fe</span>II(solid) at t=0; on [n(o)]t=0, the molar concentration of reaction sites present at the surface of the solid phase at t=0; and on [CrVI]t=0, the molar concentration of CrVI at t=0. Kinetic data were <span class="hlt">modeled</span> using a <span class="hlt">model</span> based on the formation of successive CrIII monolayers, -(d[CrVI]/dt) = sigma(1)j k(i)[S] [CrVI]([n(i - 1)] - [n(i)]) with k(i)[S] (in s(-1) L mol(-1)), the rate coefficient of formation of CrIII monolayer i, and [n(i)] and [n(i - 1)], the molar concentration of CrIII precipitated in monolayer i and monolayer i - 1, respectively. Good matching curves were obtained with kinetic coefficients: k(1)[S] = 5-8 x 10(-4), k(2)[S] = 0.5-3 x 10(-5), and k(3)[S] about 1.7 x 10(-6) s(-1) m(-2) L. The CrVI removal efficiency progressively decreases along with the accumulation of CrIII monolayers at the surface of carbonate green rust particles. In the case of thick green rust particles resulting from the corrosion of iron in permeable reactive barriers, the quantity of <span class="hlt">Fe</span>II readily accessible for efficient CrVI removal should be rather low.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017MMTB...48.1348L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017MMTB...48.1348L"><span>Solid-State Reaction Between <span class="hlt">Fe</span>-Al-Ca Alloy and Al2O3-CaO-<span class="hlt">Fe</span>O Oxide During Heat Treatment at 1473 K (1200 °C)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Liu, Chengsong; Yang, Shufeng; Li, Jingshe; Ni, Hongwei; Zhang, Xueliang</p> <p>2017-04-01</p> <p>The aim of this study was to control the physicochemical characteristics of inclusions in steel through appropriate heat treatment. Using a confocal scanning laser microscope (CSLM) and pipe furnace, the solid-state reactions between <span class="hlt">Fe</span>-Al-Ca alloy and Al2O3-CaO-<span class="hlt">Fe</span>O oxide during heat treatment at 1473 K (1200 °C) and the influence of these reactions on the compositions of and phases in the alloy and oxide were investigated by the diffusion couple method. Suitable pretreatment of the oxide using a CSLM and production of the diffusion couple of <span class="hlt">Fe</span>-Al-Ca alloy and Al2O3-CaO-<span class="hlt">Fe</span>O oxide gave good contact between the alloy and oxide. The diffusion couple was then sealed in a quartz tube with a piece of Ti foil to lower oxygen partial pressure and a block of <span class="hlt">Fe</span>-Al-Ca alloy was introduced to conduct heat treatment experiments. Solid-state reactions between the alloy and oxide during heat treatment at 1473 K (1200 °C) were analyzed and discussed. A dynamic <span class="hlt">model</span> to calculate the width of the particle precipitation zone based on the Wagner <span class="hlt">model</span> of internal oxidation of metal was proposed. This <span class="hlt">model</span> was helpful to understand the solid-state reaction mechanism between <span class="hlt">Fe</span>-Al-Ca alloy and Al2O3-CaO-<span class="hlt">Fe</span>O oxide.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2013JNR....15.1405L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2013JNR....15.1405L"><span>Effects of <span class="hlt">Fe</span> nanoparticles on bacterial growth and biosurfactant production</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Liu, Jia; Vipulanandan, Cumaraswamy; Cooper, Tim F.; Vipulanandan, Geethanjali</p> <p>2013-01-01</p> <p>Environmental conditions can have a major impact on bacterial growth and production of secondary products. In this study, the effect of different concentrations of <span class="hlt">Fe</span> nanoparticles on the growth of Serratia sp. and on its production of a specific biosurfactant was investigated. The <span class="hlt">Fe</span> nanoparticles were produced using the foam method, and the needle-shaped nanoparticles were about 30 nm in diameter. It was found that <span class="hlt">Fe</span> nanoparticles can have either a positive or a negative impact on the bacterial growth and biosurfactant production, depending on their concentration. At 1 mg/L of <span class="hlt">Fe</span> nanoparticle concentration the bacterial growth increased by 57 % and biosurfactant production increased by 63 %. When the <span class="hlt">Fe</span> nanoparticle concentration was increased to 1 g/L, the bacterial growth decreased by 77 % and biosurfactant activity was undetectable. The biosurfactant itself was not directly affected by <span class="hlt">Fe</span> nanoparticles over the range of concentrations studied, indicating that the observed changes in biosurfactant activity resulted indirectly from the effect of nanoparticles on the bacteria. These negative effects with nanoparticle exposures were temporary, demonstrated by the restoration of biosurfactant activity when the bacteria initially exposed to <span class="hlt">Fe</span> nanoparticles were allowed to regrow in the absence of nanoparticles. Finally, the kinetics of bacterial growth and biosurfactant production were <span class="hlt">modeled</span>. The <span class="hlt">model</span>'s predictions agreed with the experimental results.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018AIPC.1942k0022K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018AIPC.1942k0022K"><span>Metal insulator transition in nickel substituted <span class="hlt">Fe</span>Si</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Krishnan, M.; Mishra, Ashish; Singh, Durgesh; Venkatesh, R.; Gangrade, Mohan; Ganesan, V.</p> <p>2018-04-01</p> <p>Resistivity of <span class="hlt">Fe</span>1-xNixSi has been reported. Metal Insulator transition (MIT) is observed in Nickel (Ni) substituted <span class="hlt">Fe</span>Si for x in the range from 2 to 4 percentage. Two Band <span class="hlt">Model</span> has been employed in order to calculate activation energy and to predict how band structure renormalized with substitution of nickel in <span class="hlt">Fe</span>Si. At sufficient level of nickel concentration an impurity band forms around Fermi level and contributes to the conduction heavily at low temperatures. Concentration around x = 0.04, displays metallic property below ˜ 70 K and is quantitatively similar to systems like <span class="hlt">Fe</span>1-xTxSi (T = Co, Mn). Metallic component thus derived from Ni substituted <span class="hlt">Fe</span>Si seems to have an unconventional temperature dependence that may be attributed to the onset of departures from Fermi liquid picture.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017JPS...367..202L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017JPS...367..202L"><span>A physics-based fractional order <span class="hlt">model</span> and state of energy estimation for lithium ion batteries. <span class="hlt">Part</span> II: Parameter identification and state of energy estimation for Li<span class="hlt">Fe</span>PO4 battery</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Li, Xiaoyu; Pan, Ke; Fan, Guodong; Lu, Rengui; Zhu, Chunbo; Rizzoni, Giorgio; Canova, Marcello</p> <p>2017-11-01</p> <p>State of energy (SOE) is an important index for the electrochemical energy storage system in electric vehicles. In this paper, a robust state of energy estimation method in combination with a physical <span class="hlt">model</span> parameter identification method is proposed to achieve accurate battery state estimation at different operating conditions and different aging stages. A physics-based fractional order <span class="hlt">model</span> with variable solid-state diffusivity (FOM-VSSD) is used to characterize the dynamic performance of a Li<span class="hlt">Fe</span>PO4/graphite battery. In order to update the <span class="hlt">model</span> parameter automatically at different aging stages, a multi-step <span class="hlt">model</span> parameter identification method based on the lexicographic optimization is especially designed for the electric vehicle operating conditions. As the battery available energy changes with different applied load current profiles, the relationship between the remaining energy loss and the state of charge, the average current as well as the average squared current is <span class="hlt">modeled</span>. The SOE with different operating conditions and different aging stages are estimated based on an adaptive fractional order extended Kalman filter (AFEKF). Validation results show that the overall SOE estimation error is within ±5%. The proposed method is suitable for the electric vehicle online applications.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017AIPC.1850i0002A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017AIPC.1850i0002A"><span>Experimental and thermodynamic study of Co-<span class="hlt">Fe</span> and Mn-<span class="hlt">Fe</span> based mixed metal oxides for thermochemical energy storage application</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>André, Laurie; Abanades, Stéphane; Cassayre, Laurent</p> <p>2017-06-01</p> <p>Metal oxides are potential materials for thermochemical heat storage, and among them, cobalt oxide and manganese oxide are attracting attention. Furthermore, studies on mixed oxides are ongoing, as the synthesis of mixed oxides could be a way to answer the drawbacks of pure metal oxides, such as slow reaction kinetics, loss-in-capacity over cycles or sintering, selected for thermochemical heat storage application. The addition of iron oxide is under investigation and the obtained results are presented. This work proposes a comparison of thermodynamic <span class="hlt">modelling</span> with experimental data in order to identify the impact of iron oxide addition to cobalt oxide and manganese oxide. <span class="hlt">Fe</span> addition decreased the redox activity and energy storage capacity of Co3O4, whereas the cycling stability of Mn2O3 was significantly improved with added <span class="hlt">Fe</span> amounts above 20 mol% while the energy storage capacity was unchanged. The thermodynamic <span class="hlt">modelling</span> method to predict the behavior of the Mn-<span class="hlt">Fe</span>-O and Co-<span class="hlt">Fe</span>-O systems was validated, and the possibility to identify other mixed oxides becomes conceivable, by enabling the selection of transition metals additives for metal oxides destined for thermochemical energy storage applications.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/23246086','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/23246086"><span>Anthropometric dependence of the response of a thorax <span class="hlt">FE</span> <span class="hlt">model</span> under high speed loading: validation and real world accident replication.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Roth, Sébastien; Torres, Fabien; Feuerstein, Philippe; Thoral-Pierre, Karine</p> <p>2013-05-01</p> <p>Finite element analysis is frequently used in several fields such as automotive simulations or biomechanics. It helps researchers and engineers to understand the mechanical behaviour of complex structures. The development of computer science brought the possibility to develop realistic computational <span class="hlt">models</span> which can behave like physical ones, avoiding the difficulties and costs of experimental tests. In the framework of biomechanics, lots of <span class="hlt">FE</span> <span class="hlt">models</span> have been developed in the last few decades, enabling the investigation of the behaviour of the human body submitted to heavy damage such as in road traffic accidents or in ballistic impact. In both cases, the thorax/abdomen/pelvis system is frequently injured. The understanding of the behaviour of this complex system is of extreme importance. In order to explore the dynamic response of this system to impact loading, a finite element <span class="hlt">model</span> of the human thorax/abdomen/pelvis system has, therefore, been developed including the main organs: heart, lungs, kidneys, liver, spleen, the skeleton (with vertebrae, intervertebral discs, ribs), stomach, intestines, muscles, and skin. The <span class="hlt">FE</span> <span class="hlt">model</span> is based on a 3D reconstruction, which has been made from medical records of anonymous patients, who have had medical scans with no relation to the present study. Several scans have been analyzed, and specific attention has been paid to the anthropometry of the reconstructed <span class="hlt">model</span>, which can be considered as a 50th percentile male <span class="hlt">model</span>. The biometric parameters and laws have been implemented in the dynamic <span class="hlt">FE</span> code (Radioss, Altair Hyperworks 11©) used for dynamic simulations. Then the 50th percentile <span class="hlt">model</span> was validated against experimental data available in the literature, in terms of deflection, force, whose curve must be in experimental corridors. However, for other anthropometries (small male or large male <span class="hlt">models</span>) question about the validation and results of numerical accident replications can be raised. Copyright © 2012 Elsevier</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1329680-fe-vacancy-ordering-superconducting-k1xfe2yse2-first-principles-calculations-monte-carlo-simulations','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1329680-fe-vacancy-ordering-superconducting-k1xfe2yse2-first-principles-calculations-monte-carlo-simulations"><span><span class="hlt">Fe</span>-vacancy ordering in superconducting K 1–x<span class="hlt">Fe</span> 2–ySe 2: First-principles calculations and Monte Carlo simulations</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Fang, Yong; Tai, Yuan -Yen; Deng, Junkai; ...</p> <p>2015-07-20</p> <p><span class="hlt">Fe</span> vacancies in the 33 K superconductor K 1–x<span class="hlt">Fe</span> 2–ySe 2 show ordering schemes that may be correlated with its superconducting properties. First-principles calculations and kinetic Monte Carlo simulations lead to a very simple <span class="hlt">model</span> for vacancy ordering. Repulsive dipolar interactions between <span class="hlt">Fe</span> vacancies show three ground states: amore » $$\\sqrt{8}\\times \\sqrt{10}$$ rhombus-ordered structure for 12.5% vacancies, a $$\\sqrt{5}\\times \\sqrt{5}$$ squared lattice for 20% vacancies, and a $$\\sqrt{5}\\times \\sqrt{5}$$ rhombus-ordered structure for 25% vacancies. Other structural states are derived from these three ground states and may contain additional disordered spatial regions. As a result, the repulsive interaction between <span class="hlt">Fe</span> vacancies arises from enhanced Fe–Se covalent bonds, which differs from the well-known attractive interaction of <span class="hlt">Fe</span> vacancies in body-centered cubic <span class="hlt">Fe</span>.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/1025656-about-barriers-reaction-ccl4-hfeoh-fecl2','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/1025656-about-barriers-reaction-ccl4-hfeoh-fecl2"><span>About the Barriers to Reaction of CCl4 with HFeOH and <span class="hlt">Fe</span>Cl2</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Ginovska-Pangovska, Bojana; Camaioni, Donald M.; Dupuis, Michel</p> <p>2011-08-11</p> <p>The reactivity of iron nanoparticles in aqueous environments has received considerable attention due to their potential utilization in environmental remediation technologies. As <span class="hlt">part</span> of a broader program aiming at an improved understanding of the mechanisms involved in the degradation of harmful chlorocarbons, joint experimental and computational studies of <span class="hlt">model</span> systems were initiated. We previously reported on the reaction of one and two <span class="hlt">Fe</span> atoms reactions with carbon tetrachloride (CCl4) in direct mimic of “atom-dropping” experiments, with insights into the formation of novel iron-carbon-chlorine complexes, their structures and possible reaction mechanisms. Increasing the level of complexity, we report here on themore » <span class="hlt">modeling</span> of the reaction of HFeOH and CCl4 as companion research of recent ultra high vacuum experiments of the reaction of <span class="hlt">Fe</span> with water and CCl4. HFeOH is a stable molecular species formed in the reaction of <span class="hlt">Fe</span> with H2O. Experimentally the (<span class="hlt">Fe</span>, H2O, CCl4) system showed no reactivity up to the desorption temperature of CCl4. Electron correlated CCSD(T) calculations (at DFT(B3LYP) optimized structures) indicated an energy barrier to reactivity of 24.5 kcal/mol following the formation of a stable ( 7.5 kcal/mol) long-range precursor complex. This finding is consistent with the lack of experimentally detected reaction products. This work was supported by the US Department of Energy Basic Energy Sciences' Chemical Sciences, Geosciences & Biosciences Division. Pacific Northwest National Laboratory is operated by Battelle for the US Department of Energy.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018AAS...23125014D','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018AAS...23125014D"><span>Measuring the Outflow Properties of <span class="hlt">Fe</span>LoBAL Quasars</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Dabbieri, Collin; Choi, Hyunseop; MacInnis, Francis; Leighly, Karen; Terndrup, Donald</p> <p>2018-01-01</p> <p>Roughly 20 percent of the quasar population shows broad absorption lines, which are indicators of an energetic wind. Within the broad absorption line class of quasars exist <span class="hlt">Fe</span>LoBAL quasars, which show strong absorption lines from the <span class="hlt">Fe</span> II and <span class="hlt">Fe</span> III transitions as well as other low-ionization lines. <span class="hlt">Fe</span>LoBALs are of particular interest because they are thought to possibly be a short-lived stage in a quasar's life where it expels its shroud of gas and dust. This means the winds we see from <span class="hlt">Fe</span>LoBALs are one manifestation of galactic feedback. This idea is supported by Farrah et al. (2012) who found an anti correlation between outflow strength and contribution from star formation to the total IR luminosity of the host galaxy when examining a sample of <span class="hlt">Fe</span>LoBAL quasars. We analyze the sample of 26 <span class="hlt">Fe</span>LoBALs from Farrah et al. (2012) in order to measure the properties of their outflows, including ionization, density, column density and covering fraction. The absorption and continuum profiles of these objects are <span class="hlt">modeled</span> using SimBAL, a program which creates synthetic spectra using a grid of Cloudy <span class="hlt">models</span>. A Monte-Carlo method is employed to determine posterior probabilities for the physical parameters of the outflow. From these probabilities we extract the distance of the outflow, the mass outflow rate and the kinetic luminosity. We demonstrate SimBAL is capable of <span class="hlt">modeling</span> a wide range of spectral morphologies. From the 26 objects studied we observe interesting correlations between ionization parameter, distance and density. Analysis of our sample also suggests a dearth of objects with velocity widths greater than or equal to 300 km/s at distances greater than or equal to 100 parsecs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2006E%26PSL.252..342S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2006E%26PSL.252..342S"><span>Modes of planetary-scale <span class="hlt">Fe</span> isotope fractionation</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Schoenberg, Ronny; von Blanckenburg, Friedhelm</p> <p>2006-12-01</p> <p>A comprehensive set of high-precision <span class="hlt">Fe</span> isotope data for the principle meteorite types and silicate reservoirs of the Earth is used to investigate iron isotope fractionation at inter- and intra-planetary scales. 14 chondrite analyses yield a homogeneous <span class="hlt">Fe</span> isotope composition with an average δ56<span class="hlt">Fe</span>/ 54<span class="hlt">Fe</span> value of - 0.015 ± 0.020‰ (2 SE) relative to the international iron standard IRMM-014. Eight non-cumulate and polymict eucrite meteorites that sample the silicate portion of the HED (howardite-eucrite-diogenite) parent body yield an average δ56<span class="hlt">Fe</span>/ 54<span class="hlt">Fe</span> value of - 0.001 ± 0.017‰, indistinguishable to the chondritic <span class="hlt">Fe</span> isotope composition. <span class="hlt">Fe</span> isotope ratios that are indistinguishable to the chondritic value have also been published for SNC meteorites. This inner-solar system homogeneity in <span class="hlt">Fe</span> isotopes suggests that planetary accretion itself did not significantly fractionate iron. Nine mantle xenoliths yield a 2 σ envelope of - 0.13‰ to + 0.09‰ in δ56<span class="hlt">Fe</span>/ 54<span class="hlt">Fe</span>. Using this range as proxy for the bulk silicate Earth in a mass balance <span class="hlt">model</span> places the <span class="hlt">Fe</span> isotope composition of the outer liquid core that contains ca. 83% of Earth's total iron to within ± 0.020‰ of the chondritic δ56<span class="hlt">Fe</span>/ 54<span class="hlt">Fe</span> value. These calculations allow to interprete magmatic iron meteorites ( δ56<span class="hlt">Fe</span>/ 54<span class="hlt">Fe</span> = + 0.047 ± 0.016‰; N = 8) to be representative for the Earth's inner metallic core. Eight terrestrial basalt samples yield a homogeneous <span class="hlt">Fe</span> isotope composition with an average δ56<span class="hlt">Fe</span>/ 54<span class="hlt">Fe</span> value of + 0.072 ± 0.016‰. The observation that terrestrial basalts appear to be slightly heavier than mantle xenoliths and that thus partial mantle melting preferentially transfers heavy iron into the melt [S. Weyer, A.D. Anbar, G.P. Brey, C. Munker, K. Mezger and A.B. Woodland, Iron isotope fractionation during planetary differentiation, Earth and Planetary Science Letters 240(2), 251-264, 2005.] is intriguing, but also raises some important questions: first it is questionable whether the</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2014-title12-vol2/pdf/CFR-2014-title12-vol2-part202-appB.pdf','CFR2014'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2014-title12-vol2/pdf/CFR-2014-title12-vol2-part202-appB.pdf"><span>12 CFR Appendix B to <span class="hlt">Part</span> 202 - <span class="hlt">Model</span> Application Forms</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-01-01</p> <p>... 12 Banks and Banking 2 2014-01-01 2014-01-01 false <span class="hlt">Model</span> Application Forms B Appendix B to <span class="hlt">Part</span>... CREDIT OPPORTUNITY ACT (REGULATION B) Pt. 202, App. B Appendix B to <span class="hlt">Part</span> 202—<span class="hlt">Model</span> Application Forms 1... appear on the creditor's form. 3. If a creditor uses an appropriate Appendix B <span class="hlt">model</span> form, or modifies a...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/22494721-investigation-fe-sup-centers-perovskite-kmgf-sub-through-combination-ab-initio-density-functional-theory-semi-empirical-superposition-model-calculations','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/22494721-investigation-fe-sup-centers-perovskite-kmgf-sub-through-combination-ab-initio-density-functional-theory-semi-empirical-superposition-model-calculations"><span>Investigation of the <span class="hlt">Fe</span>{sup 3+} centers in perovskite KMgF{sub 3} through a combination of ab initio (density functional theory) and semi-empirical (superposition <span class="hlt">model</span>) calculations</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Emül, Y.; Department of Software Engineering, Cumhuriyet University, 58140 Sivas; Erbahar, D.</p> <p>2015-08-14</p> <p>Analyses of the local crystal and electronic structure in the vicinity of <span class="hlt">Fe</span>{sup 3+} centers in perovskite KMgF{sub 3} crystal have been carried out in a comprehensive manner. A combination of density functional theory (DFT) and a semi-empirical superposition <span class="hlt">model</span> (SPM) is used for a complete analysis of all <span class="hlt">Fe</span>{sup 3+} centers in this study for the first time. Some quantitative information has been derived from the DFT calculations on both the electronic structure and the local geometry around <span class="hlt">Fe</span>{sup 3+} centers. All of the trigonal (K-vacancy case, K-Li substitution case, and normal trigonal <span class="hlt">Fe</span>{sup 3+} center case), <span class="hlt">Fe</span>F{sub 5}Omore » cluster, and tetragonal (Mg-vacancy and Mg-Li substitution cases) centers have been taken into account based on the previously suggested experimental and theoretical inferences. The collaboration between the experimental data and the results of both DFT and SPM calculations provides us to understand most probable structural <span class="hlt">model</span> for <span class="hlt">Fe</span>{sup 3+} centers in KMgF{sub 3}.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/1415796-prediction-novel-stable-fe-si-ternary-phase','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/1415796-prediction-novel-stable-fe-si-ternary-phase"><span>Prediction of novel stable <span class="hlt">Fe</span>-V-Si ternary phase</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Nguyen, Manh Cuong; Chen, Chong; Zhao, Xin</p> <p></p> <p>Genetic algorithm searches based on a cluster expansion <span class="hlt">model</span> are performed to search for stable phases of <span class="hlt">Fe</span>-V-Si ternary. Here, we identify a new thermodynamically, dynamically and mechanically stable ternary phase of <span class="hlt">Fe</span> 5V 2Si with 2 formula units in a tetragonal unit cell. The formation energy of this new ternary phase is -36.9 meV/atom below the current ternary convex hull. The magnetic moment of <span class="hlt">Fe</span> in the new structure varies from -0.30-2.52 μ B depending strongly on the number of <span class="hlt">Fe</span> nearest neighbors. The total magnetic moment is 10.44 μ B/unit cell for new <span class="hlt">Fe</span> 5V 2Si structure andmore » the system is ordinarily metallic.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1415796-prediction-novel-stable-fe-si-ternary-phase','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1415796-prediction-novel-stable-fe-si-ternary-phase"><span>Prediction of novel stable <span class="hlt">Fe</span>-V-Si ternary phase</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Nguyen, Manh Cuong; Chen, Chong; Zhao, Xin; ...</p> <p>2018-10-28</p> <p>Genetic algorithm searches based on a cluster expansion <span class="hlt">model</span> are performed to search for stable phases of <span class="hlt">Fe</span>-V-Si ternary. Here, we identify a new thermodynamically, dynamically and mechanically stable ternary phase of <span class="hlt">Fe</span> 5V 2Si with 2 formula units in a tetragonal unit cell. The formation energy of this new ternary phase is -36.9 meV/atom below the current ternary convex hull. The magnetic moment of <span class="hlt">Fe</span> in the new structure varies from -0.30-2.52 μ B depending strongly on the number of <span class="hlt">Fe</span> nearest neighbors. The total magnetic moment is 10.44 μ B/unit cell for new <span class="hlt">Fe</span> 5V 2Si structure andmore » the system is ordinarily metallic.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3076877','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3076877"><span>Characterization of a unique [<span class="hlt">Fe</span>S] cluster in the electron transfer chain of the oxygen tolerant [Ni<span class="hlt">Fe</span>] hydrogenase from Aquifex aeolicus</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Pandelia, Maria-Eirini; Nitschke, Wolfgang; Infossi, Pascale; Giudici-Orticoni, Marie-Thérèse; Bill, Eckhard; Lubitz, Wolfgang</p> <p>2011-01-01</p> <p>Iron-sulfur clusters are versatile electron transfer cofactors, ubiquitous in metalloenzymes such as hydrogenases. In the oxygen-tolerant Hydrogenase I from Aquifex aeolicus such electron “wires” form a relay to a diheme cytb, an integral <span class="hlt">part</span> of a respiration pathway for the reduction of O2 to water. Amino acid sequence comparison with oxygen-sensitive hydrogenases showed conserved binding motifs for three iron-sulfur clusters, the nature and properties of which were unknown so far. Electron paramagnetic resonance spectra exhibited complex signals that disclose interesting features and spin-coupling patterns; by redox titrations three iron-sulfur clusters were identified in their usual redox states, a [3<span class="hlt">Fe</span>4S] and two [4<span class="hlt">Fe</span>4S], but also a unique high-potential (HP) state was found. On the basis of 57<span class="hlt">Fe</span> Mössbauer spectroscopy we attribute this HP form to a superoxidized state of the [4<span class="hlt">Fe</span>4S] center proximal to the [Ni<span class="hlt">Fe</span>] site. The unique environment of this cluster, characterized by a surplus cysteine coordination, is able to tune the redox potentials and make it compliant with the [4<span class="hlt">Fe</span>4S]3+ state. It is actually the first example of a biological [4<span class="hlt">Fe</span>4S] center that physiologically switches between 3+, 2+, and 1+ oxidation states within a very small potential range. We suggest that the (1 + /2+) redox couple serves the classical electron transfer reaction, whereas the superoxidation step is associated with a redox switch against oxidative stress. PMID:21444783</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/21455233-analysis-optical-fe-ii-emission-sample-active-galactic-nucleus-spectra','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/21455233-analysis-optical-fe-ii-emission-sample-active-galactic-nucleus-spectra"><span>ANALYSIS OF OPTICAL <span class="hlt">Fe</span> II EMISSION IN A SAMPLE OF ACTIVE GALACTIC NUCLEUS SPECTRA</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Kovacevic, Jelena; Popovic, Luka C.; Dimitrijevic, Milan S., E-mail: jkovacevic@aob.bg.ac.r</p> <p></p> <p>We present a study of optical <span class="hlt">Fe</span> II emission in 302 active galactic nuclei (AGNs) selected from the Sloan Digital Sky Survey. We group the strongest <span class="hlt">Fe</span> II multiplets into three groups according to the lower term of the transition (b{sup 4} F, a{sup 6} S, and a{sup 4} G terms). These approximately correspond to the blue, central, and red <span class="hlt">parts</span>, respectively, of the 'iron shelf' around H{beta}. We calculate an <span class="hlt">Fe</span> II template that takes into account transitions into these three terms and an additional group of lines, based on a reconstruction of the spectrum of I Zw 1.more » This <span class="hlt">Fe</span> II template gives a more precise fit of the <span class="hlt">Fe</span> II lines in broad-line AGNs than other templates. We extract <span class="hlt">Fe</span> II, H{alpha}, H{beta}, [O III], and [N II] emission parameters and investigate correlations between them. We find that <span class="hlt">Fe</span> II lines probably originate in an intermediate line region. We note that the blue, red, and central <span class="hlt">parts</span> of the iron shelf have different relative intensities in different objects. Their ratios depend on continuum luminosity, FWHM H{beta}, the velocity shift of <span class="hlt">Fe</span> II, and the H{alpha}/H{beta} flux ratio. We examine the dependence of the well-known anti-correlation between the equivalent widths of <span class="hlt">Fe</span> II and [O III] on continuum luminosity. We find that there is a Baldwin effect for [O III] but an inverse Baldwin effect for the <span class="hlt">Fe</span> II emission. The [O III]/<span class="hlt">Fe</span> II ratio thus decreases with L {sub {lambda}5100}. Since the ratio is a major component of the Boroson and Green Eigenvector 1 (EV1), this implies a connection between the Baldwin effect and EV1 and could be connected with AGN evolution. We find that spectra are different for H{beta} FWHMs greater and less than {approx}3000 km s{sup -1}, and that there are different correlation coefficients between the parameters.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017PhRvB..95l5138M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017PhRvB..95l5138M"><span>Magnetic order of intermetallic <span class="hlt">Fe</span>Ga3 -yGey studied by μ SR and 57<span class="hlt">Fe</span> Mössbauer spectroscopy</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Munevar, J.; Cabrera-Baez, M.; Alzamora, M.; Larrea, J.; Bittar, E. M.; Baggio-Saitovitch, E.; Litterst, F. J.; Ribeiro, R. A.; Avila, M. A.; Morenzoni, E.</p> <p>2017-03-01</p> <p>Temperature-dependent magnetization, muon spin rotation, and 57<span class="hlt">Fe</span> Mössbauer spectroscopy experiments performed on crystals of intermetallic <span class="hlt">Fe</span>Ga3 -yGey (y =0.11 ,0.14 ,0.17 ,0.22 ,0.27 ,0.29 ,0.32 ) are reported. Whereas at y =0.11 even a sensitive magnetic microprobe such as μ SR does not detect magnetism, all other samples display weak ferromagnetism with a magnetic moment of up to 0.22 μB per <span class="hlt">Fe</span> atom. As a function of doping and of temperature, a crossover from short-range to long-range magnetic order is observed, characterized by a broadly distributed spontaneous internal field. However, y =0.14 and 0.17 remain in the short-range-ordered state down to the lowest investigated temperature. The transition from short-range to long-range order appears to be accompanied by a change of the character of the spin fluctuations, which exhibit a spin-wave excitation signature in the long-range-order <span class="hlt">part</span> of the phase diagram. Mössbauer spectroscopy for y =0.27 and 0.32 indicates that the internal field lies in the plane perpendicular to the crystallographic c axis. The field distribution and its evolution with doping suggest that the details of the <span class="hlt">Fe</span> magnetic moment formation and the consequent magnetic state are determined not only by the dopant concentration, but also by the way the replacement of the Ga atoms surrounding the <span class="hlt">Fe</span> is accomplished.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/28553201','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/28553201"><span><span class="hlt">Fe</span>65-PTB2 Dimerization Mimics <span class="hlt">Fe</span>65-APP Interaction.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Feilen, Lukas P; Haubrich, Kevin; Strecker, Paul; Probst, Sabine; Eggert, Simone; Stier, Gunter; Sinning, Irmgard; Konietzko, Uwe; Kins, Stefan; Simon, Bernd; Wild, Klemens</p> <p>2017-01-01</p> <p>Physiological function and pathology of the Alzheimer's disease causing amyloid precursor protein (APP) are correlated with its cytosolic adaptor <span class="hlt">Fe</span>65 encompassing a WW and two phosphotyrosine-binding domains (PTBs). The C-terminal <span class="hlt">Fe</span>65-PTB2 binds a large portion of the APP intracellular domain (AICD) including the GYENPTY internalization sequence fingerprint. AICD binding to <span class="hlt">Fe</span>65-PTB2 opens an intra-molecular interaction causing a structural change and altering <span class="hlt">Fe</span>65 activity. Here we show that in the absence of the AICD, <span class="hlt">Fe</span>65-PTB2 forms a homodimer in solution and determine its crystal structure at 2.6 Å resolution. Dimerization involves the unwinding of a C-terminal α-helix that mimics binding of the AICD internalization sequence, thus shielding the hydrophobic binding pocket. Specific dimer formation is validated by nuclear magnetic resonance (NMR) techniques and cell-based analyses reveal that <span class="hlt">Fe</span>65-PTB2 together with the WW domain are necessary and sufficient for dimerization. Together, our data demonstrate that <span class="hlt">Fe</span>65 dimerizes via its APP interaction site, suggesting that besides intra- also intermolecular interactions between <span class="hlt">Fe</span>65 molecules contribute to homeostatic regulation of APP mediated signaling.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_16");'>16</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li class="active"><span>18</span></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_18 --> <div id="page_19" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li class="active"><span>19</span></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="361"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5425604','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5425604"><span><span class="hlt">Fe</span>65-PTB2 Dimerization Mimics <span class="hlt">Fe</span>65-APP Interaction</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Feilen, Lukas P.; Haubrich, Kevin; Strecker, Paul; Probst, Sabine; Eggert, Simone; Stier, Gunter; Sinning, Irmgard; Konietzko, Uwe; Kins, Stefan; Simon, Bernd; Wild, Klemens</p> <p>2017-01-01</p> <p>Physiological function and pathology of the Alzheimer’s disease causing amyloid precursor protein (APP) are correlated with its cytosolic adaptor <span class="hlt">Fe</span>65 encompassing a WW and two phosphotyrosine-binding domains (PTBs). The C-terminal <span class="hlt">Fe</span>65-PTB2 binds a large portion of the APP intracellular domain (AICD) including the GYENPTY internalization sequence fingerprint. AICD binding to <span class="hlt">Fe</span>65-PTB2 opens an intra-molecular interaction causing a structural change and altering <span class="hlt">Fe</span>65 activity. Here we show that in the absence of the AICD, <span class="hlt">Fe</span>65-PTB2 forms a homodimer in solution and determine its crystal structure at 2.6 Å resolution. Dimerization involves the unwinding of a C-terminal α-helix that mimics binding of the AICD internalization sequence, thus shielding the hydrophobic binding pocket. Specific dimer formation is validated by nuclear magnetic resonance (NMR) techniques and cell-based analyses reveal that <span class="hlt">Fe</span>65-PTB2 together with the WW domain are necessary and sufficient for dimerization. Together, our data demonstrate that <span class="hlt">Fe</span>65 dimerizes via its APP interaction site, suggesting that besides intra- also intermolecular interactions between <span class="hlt">Fe</span>65 molecules contribute to homeostatic regulation of APP mediated signaling. PMID:28553201</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2010MMI....16...83M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2010MMI....16...83M"><span>Grain growth in nanocrystalline iron and <span class="hlt">Fe</span>-Al alloys</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Mirzadeh, Hamed; Zomorodian, Amir</p> <p>2010-02-01</p> <p>The effects of the annealing temperature and time, cryomilling in liquid nitrogen, and the addition of aluminum powder on the thermal stability and grain growth behavior of nanocrystalline iron were <span class="hlt">modeled</span> using the Artificial Neural Network (ANN) technique. The developed <span class="hlt">model</span> can be used as a guide for the quantification of the grain growth by considering the effects of annealing temperature and time. The <span class="hlt">model</span> also quantified the effect of Al on the thermal stability of cryomilled nanocrystalline <span class="hlt">Fe</span>. The <span class="hlt">model</span> results showed that the cryomilling of <span class="hlt">Fe</span> has a tangible effect on the stabilization of the nanostructure.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/28236687','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/28236687"><span><span class="hlt">Fe</span>(III) and <span class="hlt">Fe</span>(II) induced photodegradation of nonylphenol polyethoxylate (NPEO) oligomer in aqueous solution and toxicity evaluation of the irradiated solution.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Wang, Lei; Zhang, Junjie; Duan, Zhenghua; Sun, Hongwen</p> <p>2017-06-01</p> <p>Photodegradation of nonylphenol tri-ethoxylate (NPEO 3 ) in aqueous solution, and the effects of <span class="hlt">Fe</span>(III) or <span class="hlt">Fe</span>(II) were studied. The increasing degradation kinetics of NPEO 3 were observed when 500µM <span class="hlt">Fe</span>(III) or <span class="hlt">Fe</span>(II) was present in the solutions. Altered formation of NPEO oligomers with shorter EO chains, including nonyphenol (NP), NPEO 1 and NPEO 2 , was observed in water and in solutions containing <span class="hlt">Fe</span>(III) or <span class="hlt">Fe</span>(II). The molar percentage yields of NP and NPEO 1,2 production from NPEO 3 photodegradation were approximately 20% in NPEO 3 solution, while NPEO 3 solution with <span class="hlt">Fe</span>(III), this percentage increased to approximately 50%. In solution with <span class="hlt">Fe</span>(II), the molar balance between the photodegradation of NPEO 3 and the production of NP and NPEO 1,2 was observed. A luminescent bacterium, Vibrio fischeri, was used to identify changes in the toxicity of NPEO 3 solutions during the photodegradation process under different conditions, while dose addition (DA) <span class="hlt">model</span> was used to estimate the toxicity of products. Toxicity of NPEO 3 /water solution increased significantly following the irradiation of UVA/UVB mixture. In contrast, obviously decreasing toxicity was observed when NPEO 3 underwent photodegradation in the presence of <span class="hlt">Fe</span>(III). Copyright © 2017. Published by Elsevier Inc.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/24708668','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/24708668"><span>EMGD-<span class="hlt">FE</span>: an open source graphical user interface for estimating isometric muscle forces in the lower limb using an EMG-driven <span class="hlt">model</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Menegaldo, Luciano Luporini; de Oliveira, Liliam Fernandes; Minato, Kin K</p> <p>2014-04-04</p> <p>This paper describes the "EMG Driven Force Estimator (EMGD-<span class="hlt">FE</span>)", a Matlab® graphical user interface (GUI) application that estimates skeletal muscle forces from electromyography (EMG) signals. Muscle forces are obtained by numerically integrating a system of ordinary differential equations (ODEs) that simulates Hill-type muscle dynamics and that utilises EMG signals as input. In the current version, the GUI can estimate the forces of lower limb muscles executing isometric contractions. Muscles from other <span class="hlt">parts</span> of the body can be tested as well, although no default values for <span class="hlt">model</span> parameters are provided. To achieve accurate evaluations, EMG collection is performed simultaneously with torque measurement from a dynamometer. The computer application guides the user, step-by-step, to pre-process the raw EMG signals, create inputs for the muscle <span class="hlt">model</span>, numerically integrate the ODEs and analyse the results. An example of the application's functions is presented using the quadriceps femoris muscle. Individual muscle force estimations for the four components as well the knee isometric torque are shown. The proposed GUI can estimate individual muscle forces from EMG signals of skeletal muscles. The estimation accuracy depends on several factors, including signal collection and <span class="hlt">modelling</span> hypothesis issues.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2008ApSS..254.2441Y','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2008ApSS..254.2441Y"><span>Analysis of XPS spectra of <span class="hlt">Fe</span> 2+ and <span class="hlt">Fe</span> 3+ ions in oxide materials</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Yamashita, Toru; Hayes, Peter</p> <p>2008-02-01</p> <p>Samples of the iron oxides <span class="hlt">Fe</span> 0.94O, <span class="hlt">Fe</span> 3O 4, <span class="hlt">Fe</span> 2O 3, and <span class="hlt">Fe</span> 2SiO 4 were prepared by high temperature equilibration in controlled gas atmospheres. The samples were fractured in vacuum and high resolution XPS spectra of the fractured surfaces were measured. The peak positions and peak shape parameters of <span class="hlt">Fe</span> 3p for <span class="hlt">Fe</span> 2+ and <span class="hlt">Fe</span> 3+ were derived from the <span class="hlt">Fe</span> 3p XPS spectra of the standard samples of 2<span class="hlt">Fe</span>O·SiO 2 and <span class="hlt">Fe</span> 2O 3, respectively. Using these parameters, the <span class="hlt">Fe</span> 3p peaks of <span class="hlt">Fe</span> 3O 4 and <span class="hlt">Fe</span> 1- yO are analysed. The results indicate that high resolution XPS techniques can be used to determine the <span class="hlt">Fe</span> 2+/<span class="hlt">Fe</span> 3+ ratios in metal oxides. The technique has the potential for application to other transition metal oxide systems.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011AGUFM.P31C1719B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011AGUFM.P31C1719B"><span>X-Ray Absorption Spectroscopy of <span class="hlt">Fe</span>-Substituted Allophane and Imogolite</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Baker, L. L.; Strawn, D. G.; Nickerson, R. D.; McDaniel, P.</p> <p>2011-12-01</p> <p>Martian rocks and sediments contain weathering products including clay minerals formed as a result of interaction between rocks and water, and these materials can act as important indicators of past surface conditions on Mars. Weathering of terrestrial volcanic rocks similar to those on Mars produces nano-sized, variably hydrated aluminosilicate and iron oxide minerals, including allophane, imogolite, halloysite, hisingerite, and ferrihydrite. The nanoaluminosilicates can contain isomorphically substituted <span class="hlt">Fe</span>, which may affect their spectral and physical properties as well as their eventual recrystallization products. Detection and quantification of such minerals in natural environments on Earth is difficult due to their variable chemical composition and lack of long-range crystalline order. Their accurate detection and quantification on Mars requires a better understanding of how composition affects their spectral properties and evolution to more crystalline phases. Aluminosilicate nanoparticles of varying composition were synthesized with isomorphically substituted <span class="hlt">Fe</span> at <span class="hlt">Fe</span>:Al ratios of 1:100. Allophanes were synthesized with Al:Si ratios of 2:1, 1:1, and 1:3. The substituted <span class="hlt">Fe</span> was probed using <span class="hlt">Fe</span> K-edge X-ray absorption fine structure spectroscopy (XAFS). The XAFS spectrum contains information about the molecular environment surrounding the target atom, and is an ideal technique for studying poorly crystalline materials that are difficult to characterize using bulk methods such as XRD. The near-edge (XANES) and extended (EXAFS) portions of the XAFS spectrum were examined, and allophane backscattering paths were fit using coordinates for a modified nanoball <span class="hlt">model</span> (1). XANES spectra rule out ferrihydrite in the synthetic samples, suggesting all <span class="hlt">Fe</span> was incorporated into the aluminosilicate structure. The XAFS results suggest that <span class="hlt">Fe</span> substituted into the allophane structure is present as <span class="hlt">Fe</span>(III) in octahedral coordination in a well-ordered sheet. Some <span class="hlt">Fe</span></p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017PhLA..381..524L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017PhLA..381..524L"><span>Modulated exchange bias in Ni<span class="hlt">Fe/CoO/α-Fe</span>2O3 trilayers and Ni<span class="hlt">Fe</span>/CoO bilayers</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Li, X.; Lin, K.-W.; Yeh, W.-C.; Desautels, R. D.; van Lierop, J.; Pong, Philip W. T.</p> <p>2017-02-01</p> <p>While the exchange bias in ferromagnetic/antiferromagnetic (FM/AF) bilayer and FM1/AF/FM2 trilayer configurations has been widely investigated, the role of an AF2 layer in FM/AF1/AF2 trilayer configurations is still not well understood. In this work, the magnetic properties of Ni<span class="hlt">Fe</span>/CoO, Ni<span class="hlt">Fe/α-Fe</span>2O3 bilayers, and Ni<span class="hlt">Fe/CoO/α-Fe</span>2O3 trilayer were studied comparatively. The microstructure and chemical composition were characterized. Temperature dependent magnetometry reveals increased irreversibility temperature in Ni<span class="hlt">Fe/CoO/α-Fe</span>2O3 trilayer compared with Ni<span class="hlt">Fe</span>/CoO bilayer. The magnetic hysteresis loops show that the exchange bias (Hex) and coercivity (Hc) depend strongly on the anisotropy of AF layer (CoO, α-<span class="hlt">Fe</span>2O3 and CoO/α-<span class="hlt">Fe</span>2O3). Our work shows that the AF1/AF2 interfacial interactions can be used effectively for tuning the exchange bias in FM/AF1/AF2 trilayers.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/22483066-synergistic-stabilization-metastable-fe-sub-sub-fe-undercooled-fe-sub-sub','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/22483066-synergistic-stabilization-metastable-fe-sub-sub-fe-undercooled-fe-sub-sub"><span>Synergistic stabilization of metastable <span class="hlt">Fe</span>{sub 23}B{sub 6} and γ-<span class="hlt">Fe</span> in undercooled <span class="hlt">Fe</span>{sub 83}B{sub 17}</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Quirinale, D. G.; Rustan, G. E.; Kreyssig, A.</p> <p>2015-06-15</p> <p>Previous investigations of undercooled liquid <span class="hlt">Fe</span>{sub 83}B{sub 17} near the eutectic composition have found that metastable crystalline phases, such as <span class="hlt">Fe</span>{sub 23}B{sub 6}, can be formed and persist down to ambient temperature even for rather modest cooling rates. Using time-resolved high-energy x-ray diffraction on electrostatically levitated samples of <span class="hlt">Fe</span>{sub 83}B{sub 17}, we demonstrate that the <span class="hlt">Fe</span>{sub 23}B{sub 6} metastable phase and fcc γ-<span class="hlt">Fe</span> grow coherently from the undercooled <span class="hlt">Fe</span>{sub 83}B{sub 17} liquid and effectively suppress the formation of the equilibrium <span class="hlt">Fe</span>{sub 2}B + bcc α-<span class="hlt">Fe</span> phases. The stabilization of γ-<span class="hlt">Fe</span> offers another opportunity for experimental investigations of magnetism in metastable fcc iron.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/28061341','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/28061341"><span>Enhanced reactivity of microscale <span class="hlt">Fe</span>/Cu bimetallic particles (m<span class="hlt">Fe</span>/Cu) with persulfate (PS) for p-nitrophenol (PNP) removal in aqueous solution.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Ji, Qingqing; Li, Jun; Xiong, Zhaokun; Lai, Bo</p> <p>2017-04-01</p> <p>In this study, batch experiments were conducted to examine the enhanced reactivity of microscale <span class="hlt">Fe</span>/Cu bimetallic particles (m<span class="hlt">Fe</span>/Cu) with persulfate (PS) for p-nitrophenol (PNP) removal in aqueous solution. The key operating parameters (i.e., theoretical Cu mass loadings (TML Cu ), m<span class="hlt">Fe</span>/Cu dosage, PS dose, initial pH and temperature) were optimized by the batch experiments, respectively. The experimental data were followed well the pseudo-first-order kinetic <span class="hlt">model</span>. Result reveals that refractory PNP (500 mg L -1 ) was effectively degraded by m<span class="hlt">Fe</span>/Cu-PS system with removal of 98.4% and k obs of 1.91 min -1 after only 3 min treatment under the optimal operating conditions. Moreover, compared with control experiments (i.e., m<span class="hlt">Fe</span>/Cu, microscale <span class="hlt">Fe</span> 0 with PS (m<span class="hlt">Fe</span> 0 -PS), and PS alone), m<span class="hlt">Fe</span>/Cu-PS system exerted better performance for PNP removal due to the strong synergistic effect between PS and m<span class="hlt">Fe</span>/Cu. According to the analysis results of degradation kinetics of PNP, COD (chemical oxygen demand) removal, UV-vis absorption spectra and the intermediates formed, the results reveal that the PNP removal by m<span class="hlt">Fe</span>/Cu-PS system was mainly attributed to reduction accompanied slight oxidation. And based on the analysis of surface characteristics of m<span class="hlt">Fe</span>/Cu particles, it is further demonstrated that PS could enhance the reactivity of m<span class="hlt">Fe</span>/Cu through rapid corrosion of iron surface and decrease of surface passivation of m<span class="hlt">Fe</span>/Cu surface when the low molar ratio of PS to m<span class="hlt">Fe</span>/Cu (i.e., 1:43) was used in this study. These results also illustrates m<span class="hlt">Fe</span>/Cu-PS can be as a high efficient pretreatment technology for the removal of toxic refractory PNP from wastewater. Copyright © 2016 Elsevier Ltd. All rights reserved.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017MS%26E..170a2032S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017MS%26E..170a2032S"><span>Experiments of eliminating the destructive effects of excessive <span class="hlt">Fe</span> inclusions for Al secondary products</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Sun, D. Q.; Dai, G. H.; Geng, F.; Yang, K.</p> <p>2017-02-01</p> <p>Excessive <span class="hlt">Fe</span> content in Al alloys caused the serious decline of mechanical properties, such as the ductility and impact toughness. Carried out the experiments of eliminating the destructive effects of excessive <span class="hlt">Fe</span> content by flux-adding technology, which including removing a <span class="hlt">part</span> of <span class="hlt">Fe</span> content from Al scrap melt and modifying the morphology of <span class="hlt">Fe</span> rich precipitates. The experimental results showed that, the ratio of removing <span class="hlt">Fe</span> element was above 20%, and the morphology of <span class="hlt">Fe</span> rich precipitates changed from Lamellar to bulk or lath precipitations under the process parameters: the fluxing-agents composed of borax, and MnCl2 (mixed by mass ratio of 1:1), and the adding amount of fluxing-agents was about 1.5%; thrown the fluxing-agents into the Al scrap melt by powder injection process and kept for 30 min.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/21370568-situ-ray-diffraction-study-reduction-processes-fe-sub-sub-fe-sub-based-ammonia-synthesis-catalysts','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/21370568-situ-ray-diffraction-study-reduction-processes-fe-sub-sub-fe-sub-based-ammonia-synthesis-catalysts"><span>In situ X-ray diffraction study of reduction processes of <span class="hlt">Fe</span>{sub 3}O{sub 4}- and <span class="hlt">Fe</span>{sub 1-x}O-based ammonia-synthesis catalysts</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Zheng Yifan, E-mail: zhengyifan@zjut.edu.c; Catalysis Institute, Zhejiang University of Technology, Hangzhou 310014; Liu Huazhang</p> <p>2009-09-15</p> <p>The temperature-programmed reduction process of two types of industrial ammonia-synthesis catalysts, A110 and ZA-5, which are, respectively, based on <span class="hlt">Fe</span>{sub 3}O{sub 4} and <span class="hlt">Fe</span>{sub 1-x}O precursors, were studied by in situ X-ray power diffraction (XRD). It has been found that the ZA-5 has lower reduction temperature and faster reduction rate, and its active phase alpha-<span class="hlt">Fe</span> possesses a higher value of lattice microstrain than A110. The simulation based on Rietveld refinement has also shown that the shape of alpha-<span class="hlt">Fe</span> grain of ZA-5 has a mixed shape of cube and sphere with more exposing (111) and (211) planes, while that of A110more » looks like a concave cube with more exposing (110) planes. Based on the results obtained, a growth <span class="hlt">model</span> of alpha-<span class="hlt">Fe</span> during the reduction of <span class="hlt">Fe</span>{sub 3}O{sub 4}- and <span class="hlt">Fe</span>{sub 1-x}O-based ammonia-synthesis catalysts is proposed, and the origins for the activity difference has been also discussed. - Graphical Abstract: A proposed growth <span class="hlt">model</span> of active phase alpha-<span class="hlt">Fe</span> during reduction. Due to H{sub 2} diffusing easily into the pores, reduction starts on outside and inside surface simultaneously to form 'microcrystalline film', and the particles shrink during reduction which results in breaking of the aggregated oxide particle.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017GeCoA.217..292P','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017GeCoA.217..292P"><span>Schwertmannite stability in anoxic <span class="hlt">Fe</span>(II)-rich aqueous solution</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Paikaray, Susanta; Schröder, Christian; Peiffer, Stefan</p> <p>2017-11-01</p> <p>Schwertmannite (SHM) is a powerful scavenger for As(III) leading to As(III)-enriched precipitates around acid mine drainage environments that may become exposed to aqueous <span class="hlt">Fe</span>(II). In this study we have investigated the stability of pure SHM and SHM containing 0.92 wt% As(III) under <span class="hlt">Fe</span>(II)aq-rich (0.4-1.0 mM) anoxic conditions using XRD, SEM, Mössbauer and FTIR spectroscopic techniques. Schwertmannite transformation proceeded through an alkalinity-driven pathway releasing sulfate and a <span class="hlt">Fe</span>(II)-catalyzed pathway that generated lepidocrocite and goethite at pH 6 and 6.9 in the presence of 1 mM <span class="hlt">Fe</span>(II)aq. Lepidocrocite was found to be needle shaped if the SHM contained As(III) and platy for pure SHM. Goethite had a poor degree of crystallinity in As(III) containing SHM. Pre-adsorption of As(III) inhibited the extent of SHM transformation. <span class="hlt">Fe</span>(II) sorption onto SHM was pH dependent and reflected a sorption edge with complete consumption at pH 6.9, while only ∼20% were adsorbed at pH 5. Surface coverage with <span class="hlt">Fe</span>(II) appears to be the key parameter controlling extent and products of the transformation process. As(III) concentrations in solution are controlled by two mechanisms: (1) exchange of As(III) for sulfate upon alkalinity-driven transformation of schwertmannite and (2) re-adsorption to new phases formed upon <span class="hlt">Fe</span>(II)-catalyzed transformation. The adsorbed As(III) has inhibited the extent of transformation and was <span class="hlt">partly</span> released with the maximum release at pH 5 (0.5%) in the absence of <span class="hlt">Fe</span>(II)aq.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://pubs.er.usgs.gov/publication/70031166','USGSPUBS'); return false;" href="https://pubs.er.usgs.gov/publication/70031166"><span>Iron isotope fractionation during microbially stimulated <span class="hlt">Fe</span>(II) oxidation and <span class="hlt">Fe</span>(III) precipitation</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Balci, N.; Bullen, T.D.; Witte-Lien, K.; Shanks, Wayne C.; Motelica, M.; Mandernack, K.W.</p> <p>2006-01-01</p> <p>Interpretation of the origins of iron-bearing minerals preserved in modern and ancient rocks based on measured iron isotope ratios depends on our ability to distinguish between biological and non-biological iron isotope fractionation processes. In this study, we compared 56<span class="hlt">Fe</span>/54<span class="hlt">Fe</span> ratios of coexisting aqueous iron (<span class="hlt">Fe</span>(II)aq, <span class="hlt">Fe</span>(III)aq) and iron oxyhydroxide precipitates (<span class="hlt">Fe</span>(III)ppt) resulting from the oxidation of ferrous iron under experimental conditions at low pH (<3). Experiments were carried out using both pure cultures of Acidothiobacillus ferrooxidans and sterile controls to assess possible biological overprinting of non-biological fractionation, and both SO42- and Cl- salts as <span class="hlt">Fe</span>(II) sources to determine possible ionic/speciation effects that may be associated with oxidation/precipitation reactions. In addition, a series of ferric iron precipitation experiments were performed at pH ranging from 1.9 to 3.5 to determine if different precipitation rates cause differences in the isotopic composition of the iron oxyhydroxides. During microbially stimulated <span class="hlt">Fe</span>(II) oxidation in both the sulfate and chloride systems, 56<span class="hlt">Fe</span>/54<span class="hlt">Fe</span> ratios of residual <span class="hlt">Fe</span>(II)aq sampled in a time series evolved along an apparent Rayleigh trend characterized by a fractionation factor ??<span class="hlt">Fe(III)aq-Fe</span>(II)aq???1.0022. This fractionation factor was significantly less than that measured in our sterile control experiments (???1.0034) and that predicted for isotopic equilibrium between <span class="hlt">Fe</span>(II)aq and <span class="hlt">Fe</span>(III)aq (???1.0029), and thus might be interpreted to reflect a biological isotope effect. However, in our biological experiments the measured difference in 56<span class="hlt">Fe</span>/54<span class="hlt">Fe</span> ratios between <span class="hlt">Fe</span>(III)aq, isolated as a solid by the addition of NaOH to the final solution at each time point under N2-atmosphere, and <span class="hlt">Fe</span>(II)aq was in most cases and on average close to 2.9??? (??<span class="hlt">Fe(III)aq-Fe</span>(II)aq ???1.0029), consistent with isotopic equilibrium between <span class="hlt">Fe</span>(II)aq and <span class="hlt">Fe</span>(III)aq. The ferric iron precipitation experiments</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018MS%26E..367a2046A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018MS%26E..367a2046A"><span>Kinetics and Equilibrium of <span class="hlt">Fe</span>3+ Ions Adsorption on Carbon Nanofibers</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Alimin; Agusu, La; Ahmad, L. O.; Kadidae, L. O.; Ramadhan, L.; Nurdin, M.; Isdayanti, N.; Asria; Aprilia M, P.; Hasrudin</p> <p>2018-05-01</p> <p>Generally, the interaction between metal ions and adsorbent is governed by many factors including; concentration of metal ions, interaction time and solution pH. In this work, we applied liquid phase adsorption for studying the interaction between <span class="hlt">Fe</span>3+ ions and Carbon Nanofibers (CNFs) irradiated by ultrasonic waves. Kinetics and isotherms <span class="hlt">model</span> of the <span class="hlt">Fe</span>3+ ion adsorption was investigated by varying contact time and pH. We found that the <span class="hlt">Fe</span>3+ ions were efficiently adsorbed on CNFs for 0.5 h in acidic pH of around 5. In order to obtain the best-fitted isotherms <span class="hlt">model</span>, Langmuir and Freundlich’s isotherms were used in this work. The adsorption equilibrium <span class="hlt">Fe</span>3+ metal ions on CNFs tend to follow Langmuir. Adsorption kinetics of <span class="hlt">Fe</span>3+ ions on CNFs were investigated by using both pseudo-first and pseudo-second orders. The adsorption kinetics coincided well with the pseudo-second-order.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017JAfES.135..152A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017JAfES.135..152A"><span>A double <span class="hlt">Fe</span>-Ti oxide and <span class="hlt">Fe</span>-sulphide liquid immiscibility in the Itsindro Gabbro Complex, Madagascar</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Augé, Thierry; Bailly, Laurent; Roig, Jean-Yves</p> <p>2017-11-01</p> <p> main mineralized zone is located in the upper <span class="hlt">part</span> of this unit, about 70 m above this discontinuity. The highly differentiated <span class="hlt">Fe</span>-Ti-P facies of the Lanjanina series in the Itsindro Gabbro Complex have been interpreted as corresponding to the <span class="hlt">Fe</span>-Ti-P rich, Si-poor member remaining after an immiscible segregation of an evolved mafic magma. The granite dykes and the overlying granite unit represent the second, Si-rich member of the immiscibility process. The presence of large amounts of sulphide is attributed to sulphur contamination of the <span class="hlt">Fe</span>-Ti-rich liquid. <span class="hlt">Fe</span>-Ti oxides will tend to crystallize on the sulphide droplets and the accumulation of dense <span class="hlt">Fe</span>-sulphides (liquid) and associated <span class="hlt">Fe</span>-Ti oxides (solid) will result in this complex and unusual association taking the form of a net texture.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2009AGUFM.V51C1700G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2009AGUFM.V51C1700G"><span>The Partial Molar Volume and Compressibility of <span class="hlt">Fe</span>O in CaO-SiO2 Liquids: Systematic Variation with <span class="hlt">Fe</span>2+ Coordination Change</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Guo, X.; Lange, R. A.; Ai, Y.</p> <p>2009-12-01</p> <p>Iron is an important element in magmatic liquid, since its concentration can range up to 18% in some basaltic liquids, and it has two oxidation states. In order to <span class="hlt">model</span> magmatic processes, thermodynamic descriptions of silicate melts must include precise information for both the <span class="hlt">Fe</span>O and <span class="hlt">Fe</span>2O3 components. Currently, the partial molar volume of <span class="hlt">Fe</span>O is not as well known as that for <span class="hlt">Fe</span>2O3 because of the difficulty of performing double-bob density measurements under reducing conditions. Yet these data are required in order to convert sound speed measurements on <span class="hlt">Fe</span>O-bearing liquids into compressibility data, which in turn are needed extend density <span class="hlt">models</span> for magmatic liquids to elevated pressures. Moreover, there is growing evidence from the spectroscopic literature that <span class="hlt">Fe</span>2+ occurs in 4, 5, and 6-fold coordination in silicate melts, and thus it is possible that the partial molar volume and compressibility of <span class="hlt">Fe</span>O may vary with <span class="hlt">Fe</span>2+ coordination, and thus with melt composition. To explore these issues, we have conducted both density and relaxed sound speed measurements on liquids in the CaO-<span class="hlt">Fe</span>O-SiO2 system, where the CaO/SiO2 ratio was systematically varied at constant <span class="hlt">Fe</span>O concentration (40 mol%). Density was measured between 1594 and 1813K with the double-bob Archimedean method using molybdenum bobs and crucible in a reducing gas (1%CO-99%Ar) environment. The sounds speeds were measured under similar conditions with a frequency-sweep acoustic interferometer. The derived partial molar volume of <span class="hlt">Fe</span>O increases systematically from 13.7 to 15.2 cm3/mol at 1673 K as the CaO/SiO2 ratio increases and the <span class="hlt">Fe</span>2+ coordination number decreases. From a comparison with the crystalline volume of <span class="hlt">Fe</span>O (halite structure; 12.06 cm3/mol), which serves as a lower limit for VFeO in silicate liquids when <span class="hlt">Fe</span>2+ is in 6-fold coordination, we estimate that the average <span class="hlt">Fe</span>2+ coordination in our experimental melts extends up to values between 5 and 4, consistent with the spectroscopic literature. The</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012PhyU...55..489B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012PhyU...55..489B"><span><span class="hlt">Fe</span>-C and <span class="hlt">Fe</span>-H systems at pressures of the Earth's inner core</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Bazhanova, Zulfiya G.; Oganov, Artem R.; Gianola, Omar</p> <p>2012-05-01</p> <p>The solid inner core of Earth is predominantly composed of iron alloyed with several percent Ni and some lighter elements, Si, S, O, H, and C being the prime candidates. To establish the chemical composition of the inner core, it is necessary to find the range of compositions that can explain its observed characteristics. Recently, there have been a growing number of papers investigating C and H as possible light elements in the core, but the results were contradictory. Here, using ab initio simulations, we study the <span class="hlt">Fe</span>-C and <span class="hlt">Fe</span>-H systems at inner core pressures (330-364 GPa). Based on the evolutionary structure prediction algorithm USPEX, we have determined the lowest-enthalpy structures of all possible carbides (<span class="hlt">Fe</span>C, <span class="hlt">Fe</span>2C, <span class="hlt">Fe</span>3C, <span class="hlt">Fe</span>4C, <span class="hlt">Fe</span>C2, <span class="hlt">Fe</span>C3, <span class="hlt">Fe</span>C4, <span class="hlt">Fe</span>7C3) and hydrides (<span class="hlt">Fe</span>4H, <span class="hlt">Fe</span>3H, <span class="hlt">Fe</span>2H, <span class="hlt">Fe</span>H, <span class="hlt">Fe</span>H2, <span class="hlt">Fe</span>H3, <span class="hlt">Fe</span>H4) and have found that <span class="hlt">Fe</span>2C (space group Pnma) is the most stable iron carbide at pressures of the inner core, while <span class="hlt">Fe</span>H, <span class="hlt">Fe</span>H3, and <span class="hlt">Fe</span>H4 are the most stable iron hydrides at these conditions. For <span class="hlt">Fe</span>3C, the cementite structure (space group Pnma) and the Cmcm structure recently found by random sampling are less stable than the I-4 and C2/m structures predicted here. We have found that <span class="hlt">Fe</span>H3 and <span class="hlt">Fe</span>H4 adopt chemically interesting thermodynamically stable crystal structures, containing trivalent iron in both compounds. We find that the density of the inner core can be matched with a reasonable concentration of carbon, 11-15 mol.% (2.6-3.7 wt.%) at relevant pressures and temperatures, yielding the upper bound to the C content in the inner core. This concentration matches that in CI carbonaceous chondrites and corresponds to the average atomic mass in the range 49.3-51.0, in close agreement with inferences from Birch's law for the inner core. Similarly made estimates for the maximum hydrogen content are unrealistically high: 17-22 mol.% (0.4-0.5 wt.%), which corresponds to the average atomic mass of the core in the range 43.8-46.5. We conclude that carbon is a</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/23909240','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/23909240"><span>His86 from the N-terminus of frataxin coordinates iron and is required for <span class="hlt">Fe</span>-S cluster synthesis.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Gentry, Leslie E; Thacker, Matthew A; Doughty, Reece; Timkovich, Russell; Busenlehner, Laura S</p> <p>2013-09-03</p> <p>Human frataxin has a vital role in the biosynthesis of iron-sulfur (<span class="hlt">Fe</span>-S) clusters in mitochondria, and its deficiency causes the neurodegenerative disease Friedreich's ataxia. Proposed functions for frataxin in the <span class="hlt">Fe</span>-S pathway include iron donation to the <span class="hlt">Fe</span>-S cluster machinery and regulation of cysteine desulfurase activity to control the rate of <span class="hlt">Fe</span>-S production, although further molecular detail is required to distinguish these two possibilities. It is well established that frataxin can coordinate iron using glutamate and aspartate side chains on the protein surface; however, in this work we identify a new iron coordinating residue in the N-terminus of human frataxin using complementary spectroscopic and structural approaches. Further, we demonstrate that His86 in this N-terminal region is required for high affinity iron coordination and iron assembly of <span class="hlt">Fe</span>-S clusters by ISCU as <span class="hlt">part</span> of the <span class="hlt">Fe</span>-S cluster biosynthetic complex. If a binding site that includes His86 is important for <span class="hlt">Fe</span>-S cluster synthesis as <span class="hlt">part</span> of its chaperone function, this raises the possibility that either iron binding at the acidic surface of frataxin may be spurious or that it is required for protein-protein interactions with the <span class="hlt">Fe</span>-S biosynthetic quaternary complex. Our data suggest that iron coordination to frataxin may be significant to the <span class="hlt">Fe</span>-S cluster biosynthesis pathway in mitochondria.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017ApPhL.110x2403R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017ApPhL.110x2403R"><span>Tuning static and dynamic properties of <span class="hlt">FeGa/NiFe</span> heterostructures</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Rementer, Colin R.; Fitzell, Kevin; Xu, Qiang; Nordeen, Paul; Carman, Gregory P.; Wang, Yuanxun E.; Chang, Jane P.</p> <p>2017-06-01</p> <p>In this work, the frequency-dependent magnetic properties of sputtered Galfenol/Permalloy (<span class="hlt">Fe</span>85Ga15/Ni81<span class="hlt">Fe</span>19 or <span class="hlt">FeGa/NiFe</span>) magnetic multilayers were examined to tailor their magnetic softness, loss at microwave frequencies, permeability, and magnetoelasticity, leveraging the magnetic softness and low loss of Ni<span class="hlt">Fe</span> and the high saturation magnetostriction (λs) and magnetization (MS) of <span class="hlt">Fe</span>Ga. The total volume of each material and their ratio were kept constant, and the number of alternating layers was increased (with decreasing individual layer thickness) to assess the role of increasing interfaces in these magnetic heterostructures. A systematic change was observed as the number of bilayers or interfaces increases: a seven-bilayer structure results in an 88% reduction in coercivity and a 55% reduction in ferromagnetic resonance linewidth at the X-band compared to a single phase <span class="hlt">Fe</span>Ga film, while maintaining a high relative permeability of 700. The magnetostriction was slightly reduced by the addition of Ni<span class="hlt">Fe</span> but was still maintained at up to 67% that of single phase <span class="hlt">Fe</span>Ga. The tunability of these magnetic heterostructures makes them excellent candidates for RF magnetic applications requiring strong magnetoelastic coupling and low loss.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018JPS...375..106L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018JPS...375..106L"><span><span class="hlt">Modeling</span> the degradation mechanisms of C6/Li<span class="hlt">Fe</span>PO4 batteries</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Li, Dongjiang; Danilov, Dmitri L.; Zwikirsch, Barbara; Fichtner, Maximilian; Yang, Yong; Eichel, Rüdiger-A.; Notten, Peter H. L.</p> <p>2018-01-01</p> <p>A fundamental electrochemical <span class="hlt">model</span> is developed, describing the capacity fade of C6/Li<span class="hlt">Fe</span>PO4 batteries as a function of calendar time and cycling conditions. At moderate temperatures the capacity losses are mainly attributed to Li immobilization in Solid-Electrolyte-Interface (SEI) layers at the anode surface. The SEI formation <span class="hlt">model</span> presumes the availability of an outer and inner SEI layers. Electron tunneling through the inner SEI layer is regarded as the rate-determining step. The <span class="hlt">model</span> also includes high temperature degradation. At elevated temperatures, iron dissolution from the positive electrode and the subsequent metal sedimentation on the negative electrode influence the capacity loss. The SEI formation on the metal-covered graphite surface is faster than the conventional SEI formation. The <span class="hlt">model</span> predicts that capacity fade during storage is lower than during cycling due to the generation of SEI cracks induced by the volumetric changes during (dis)charging. The <span class="hlt">model</span> has been validated by cycling and calendar aging experiments and shows that the capacity loss during storage depends on the storage time, the State-of-Charge (SoC), and temperature. The capacity losses during cycling depend on the cycling current, cycling time, temperature and cycle number. All these dependencies can be explained by the single <span class="hlt">model</span> presented in this paper.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_17");'>17</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li class="active"><span>19</span></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_19 --> <div id="page_20" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li class="active"><span>20</span></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="381"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015PhRvC..92f4607S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015PhRvC..92f4607S"><span>Fusion of 48Ti+58<span class="hlt">Fe</span> and 58Ni+54<span class="hlt">Fe</span> below the Coulomb barrier</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Stefanini, A. M.; Montagnoli, G.; Corradi, L.; Courtin, S.; Bourgin, D.; Fioretto, E.; Goasduff, A.; Grebosz, J.; Haas, F.; Mazzocco, M.; Mijatović, T.; Montanari, D.; Pagliaroli, M.; Parascandolo, C.; Scarlassara, F.; Strano, E.; Szilner, S.; Toniolo, N.; Torresi, D.</p> <p>2015-12-01</p> <p>Background: No data on the fusion excitation function of 48Ti+58<span class="hlt">Fe</span> in the energy region near the Coulomb barrier existed prior to the present work, while fusion of 58Ni+54<span class="hlt">Fe</span> was investigated in detail some years ago, down to very low energies, and clear evidence of fusion hindrance was noticed at relatively high cross sections. 48Ti and 58<span class="hlt">Fe</span> are soft and have a low-lying quadrupole excitation lying at ≈800 -900 keV only. Instead, 58Ni and 54<span class="hlt">Fe</span> have a closed shell (protons and neutrons, respectively) and are rather rigid. Purpose: We aim to investigate (1) the possible influence of the different structures of the involved nuclei on the fusion excitation functions far below the barrier and, in particular, (2) whether hindrance is observed in 48Ti+58<span class="hlt">Fe</span> , and to compare the results with current coupled-channels <span class="hlt">models</span>. Methods: 48Ti beams from the XTU Tandem accelerator of INFN-Laboratori Nazionali di Legnaro were used. The experimental setup was based on an electrostatic beam separator, and fusion-evaporation residues (ERs) were detected at very forward angles. Angular distributions of ERs were measured. Results: Fusion cross sections of 48Ti+58<span class="hlt">Fe</span> have been obtained in a range of nearly six orders of magnitude around the Coulomb barrier, down to σ ≃2 μ b . The sub-barrier cross sections of 48Ti+58<span class="hlt">Fe</span> are much larger than those of 58Ni+54<span class="hlt">Fe</span> . Significant differences are also observed in the logarithmic derivatives and astrophysical S factors. No evidence of hindrance is observed, because coupled-channels calculations using a standard Woods-Saxon potential are able to reproduce the data in the whole measured energy range. Analogous calculations for 58Ni+54<span class="hlt">Fe</span> predict clearly too large cross sections at low energies. The two fusion barrier distributions are wide and display a complex structure that is only qualitatively fit by calculations. Conclusions: It is pointed out that all these different trends originate from the dissimilar low-energy nuclear structures of</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/28635269','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/28635269"><span>Reduction Potentials of [<span class="hlt">FeFe</span>]-Hydrogenase Accessory Iron-Sulfur Clusters Provide Insights into the Energetics of Proton Reduction Catalysis.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Artz, Jacob H; Mulder, David W; Ratzloff, Michael W; Lubner, Carolyn E; Zadvornyy, Oleg A; LeVan, Axl X; Williams, S Garrett; Adams, Michael W W; Jones, Anne K; King, Paul W; Peters, John W</p> <p>2017-07-19</p> <p>An [<span class="hlt">FeFe</span>]-hydrogenase from Clostridium pasteurianum, CpI, is a <span class="hlt">model</span> system for biological H 2 activation. In addition to the catalytic H-cluster, CpI contains four accessory iron-sulfur [<span class="hlt">Fe</span>S] clusters in a branched series that transfer electrons to and from the active site. In this work, potentiometric titrations have been employed in combination with electron paramagnetic resonance (EPR) spectroscopy at defined electrochemical potentials to gain insights into the role of the accessory clusters in catalysis. EPR spectra collected over a range of potentials were deconvoluted into individual components attributable to the accessory [<span class="hlt">Fe</span>S] clusters and the active site H-cluster, and reduction potentials for each cluster were determined. The data suggest a large degree of magnetic coupling between the clusters. The distal [4<span class="hlt">Fe</span>-4S] cluster is shown to have a lower reduction potential (∼ < -450 mV) than the other clusters, and molecular docking experiments indicate that the physiological electron donor, ferredoxin (Fd), most favorably interacts with this cluster. The low reduction potential of the distal [4<span class="hlt">Fe</span>-4S] cluster thermodynamically restricts the Fd ox /Fd red ratio at which CpI can operate, consistent with the role of CpI in recycling Fd red that accumulates during fermentation. Subsequent electron transfer through the additional accessory [<span class="hlt">Fe</span>S] clusters to the H-cluster is thermodynamically favorable.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/servlets/purl/1374131','SCIGOV-STC'); return false;" href="https://www.osti.gov/servlets/purl/1374131"><span>Reduction Potentials of [<span class="hlt">FeFe</span>]-Hydrogenase Accessory Iron–Sulfur Clusters Provide Insights into the Energetics of Proton Reduction Catalysis</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Artz, Jacob H.; Mulder, David W.; Ratzloff, Michael W.</p> <p></p> <p>An [<span class="hlt">FeFe</span>]-hydrogenase from Clostridium pasteurianum, CpI, is a <span class="hlt">model</span> system for biological H 2 activation. In addition to the catalytic H-cluster, CpI contains four accessory iron-sulfur [<span class="hlt">Fe</span>S] clusters in a branched series that transfer electrons to and from the active site. In this work, potentiometric titrations have been employed in combination with electron paramagnetic resonance (EPR) spectroscopy at defined electrochemical potentials to gain insights into the role of the accessory clusters in catalysis. EPR spectra collected over a range of potentials were deconvoluted into individual components attributable to the accessory [<span class="hlt">Fe</span>S] clusters and the active site H-cluster, and reduction potentialsmore » for each cluster were determined. The data suggest a large degree of magnetic coupling between the clusters. The distal [4<span class="hlt">Fe</span>-4S] cluster is shown to have a lower reduction potential (~ < -450 mV) than the other clusters, and molecular docking experiments indicate that the physiological electron donor, ferredoxin (Fd), most favorably interacts with this cluster. The low reduction potential of the distal [4<span class="hlt">Fe</span>-4S] cluster thermodynamically restricts the Fd ox/Fd red ratio at which CpI can operate, consistent with the role of CpI in recycling Fd redthat accumulates during fermentation. In conclusion, subsequent electron transfer through the additional accessory [<span class="hlt">Fe</span>S] clusters to the H-cluster is thermodynamically favorable.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1374131-reduction-potentials-fefe-hydrogenase-accessory-ironsulfur-clusters-provide-insights-energetics-proton-reduction-catalysis','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1374131-reduction-potentials-fefe-hydrogenase-accessory-ironsulfur-clusters-provide-insights-energetics-proton-reduction-catalysis"><span>Reduction Potentials of [<span class="hlt">FeFe</span>]-Hydrogenase Accessory Iron–Sulfur Clusters Provide Insights into the Energetics of Proton Reduction Catalysis</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Artz, Jacob H.; Mulder, David W.; Ratzloff, Michael W.; ...</p> <p>2017-06-21</p> <p>An [<span class="hlt">FeFe</span>]-hydrogenase from Clostridium pasteurianum, CpI, is a <span class="hlt">model</span> system for biological H 2 activation. In addition to the catalytic H-cluster, CpI contains four accessory iron-sulfur [<span class="hlt">Fe</span>S] clusters in a branched series that transfer electrons to and from the active site. In this work, potentiometric titrations have been employed in combination with electron paramagnetic resonance (EPR) spectroscopy at defined electrochemical potentials to gain insights into the role of the accessory clusters in catalysis. EPR spectra collected over a range of potentials were deconvoluted into individual components attributable to the accessory [<span class="hlt">Fe</span>S] clusters and the active site H-cluster, and reduction potentialsmore » for each cluster were determined. The data suggest a large degree of magnetic coupling between the clusters. The distal [4<span class="hlt">Fe</span>-4S] cluster is shown to have a lower reduction potential (~ < -450 mV) than the other clusters, and molecular docking experiments indicate that the physiological electron donor, ferredoxin (Fd), most favorably interacts with this cluster. The low reduction potential of the distal [4<span class="hlt">Fe</span>-4S] cluster thermodynamically restricts the Fd ox/Fd red ratio at which CpI can operate, consistent with the role of CpI in recycling Fd redthat accumulates during fermentation. In conclusion, subsequent electron transfer through the additional accessory [<span class="hlt">Fe</span>S] clusters to the H-cluster is thermodynamically favorable.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1999JSSCh.145..541B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1999JSSCh.145..541B"><span>Structural Chemistry and Electronic Properties of Sr 2<span class="hlt">Fe</span>IrO 6</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Battle, P. D.; Blake, G. R.; Gibb, T. C.; Vente, J. F.</p> <p>1999-07-01</p> <p>A polycrystalline sample of Sr2<span class="hlt">Fe</span>IrO6 has been synthesized and shown by a combination of X-ray diffraction, neutron diffraction, magnetometry, and Mössbauer spectroscopy to be a triclinic (space group Ioverline1; a=5.54996(3) Å, b=5.57847(3) Å, c=7.84165(3) Å, α=89.990(1)°, β=90.059(1)°, γ=90.079(1)°) perovskite, with a partially ordered (0.928:0.072(4)) distribution of transition metal cations over the six-coordinate sites. The predominant oxidation states are <span class="hlt">Fe</span>3+ and Ir5+, although the Mössbauer data suggest that ∼4% <span class="hlt">Fe</span>4+ is present. The compound is a Type II antiferromagnet below 120 K, with an ordered magnetic moment on the <span class="hlt">Fe</span>-dominated sites of 3.67(3) μB per <span class="hlt">Fe</span>3+ cation. The spins associated with the antisite defects are frustrated and do not take <span class="hlt">part</span> in the long-range magnetic ordering, consequently giving rise to hysteresis in the magnetic susceptibility below 40 K. The possible location of the <span class="hlt">Fe</span>4+ cations is discussed briefly.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/21707387','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/21707387"><span><span class="hlt">FeS/S/Fe</span>S(2) redox system and its oxidoreductase-like chemistry in the iron-sulfur world.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Wang, Wei; Yang, Bin; Qu, Youpeng; Liu, Xiaoyang; Su, Wenhui</p> <p>2011-06-01</p> <p>The iron-sulfur world (ISW) theory is an intriguing prediction regarding the origin of life on early Earth. It hypothesizes that life arose as a geochemical process from inorganic starting materials on the surface of sulfide minerals in the vicinity of deep-sea hot springs. During the last two decades, many experimental studies have been carried out on this topic, and some interesting results have been achieved. Among them, however, the processes of carbon/nitrogen fixation and biomolecular assembly on the mineral surface have received an inordinate amount of attention. To the present, an abiotic <span class="hlt">model</span> for the oxidation-reduction of intermediates participating in metabolic pathways has been ignored. We examined the oxidation-reduction effect of a prebiotic <span class="hlt">FeS/S/Fe</span>S(2) redox system on the interconversion between several pairs of α-hydroxy acids and α-keto acids (i.e., lactate/pyruvate, malate/oxaloacetate, and glycolate/glyoxylate). We found that, in the absence of <span class="hlt">Fe</span>S, elemental sulfur (S) oxidized α-hydroxy acids to form corresponding keto acids only at a temperature higher than its melting point (113°C); in the presence of <span class="hlt">Fe</span>S, such reactions occurred more efficiently through a coupled reaction mechanism, even at a temperature below the phase transition point of S. On the other hand, <span class="hlt">Fe</span>S was shown to have the capacity to reversibly reduce the keto acids. Such an oxidoreductase-like chemistry of the <span class="hlt">FeS/S/Fe</span>S(2) redox system suggests that it can determine the redox homeostasis of metabolic intermediates in the early evolutionary phase of life. The results provide a possible pathway for the development of primordial redox biochemistry in the iron-sulfur world. Key Words: Iron-sulfur world-<span class="hlt">FeS/S/Fe</span>S(2) redox system-Oxidoreductase-like chemistry. Astrobiology 11, 471-476.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/23930772','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/23930772"><span>Cross-sectional neck response of a total human body <span class="hlt">FE</span> <span class="hlt">model</span> during simulated frontal and side automobile impacts.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>White, Nicholas A; Moreno, Daniel P; Gayzik, F Scott; Stitzel, Joel D</p> <p>2015-01-01</p> <p>Human body finite element (<span class="hlt">FE</span>) <span class="hlt">models</span> are beginning to play a more prevalent role in the advancement of automotive safety. A methodology has been developed to evaluate neck response at multiple levels in a human body <span class="hlt">FE</span> <span class="hlt">model</span> during simulated automotive impacts. Three different impact scenarios were simulated: a frontal impact of a belted driver with airbag deployment, a frontal impact of a belted passenger without airbag deployment and an unbelted side impact sled test. Cross sections were created at each vertebral level of the cervical spine to calculate the force and moment contributions of different anatomical components of the neck. Adjacent level axial force ratios varied between 0.74 and 1.11 and adjacent level bending moment ratios between 0.55 and 1.15. The present technique is ideal for comparing neck forces and moments to existing injury threshold values, calculating injury criteria and for better understanding the biomechanical mechanisms of neck injury and load sharing during sub-injurious and injurious loading.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2004APS..MARP37002D','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2004APS..MARP37002D"><span>Molecular Spintronics: Theory of Spin-Dependent Electron Transport in <span class="hlt">Fe/BDT/Fe</span> Molecular Wire Systems</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Dalgleish, Hugh; Kirczenow, George</p> <p>2004-03-01</p> <p>Metal/Molecule/Metal junction systems forming molecular wires are currently the focus of intense study. Recently, spin-dependent electron transport in molecular wires with magnetic Ni electrodes has been studied theoretically, and spin-valve effects have been predicted.* Here we explore theoretically another magnetic molecular wire system, namely, ferromagnetic <span class="hlt">Fe</span> nano-contacts bridged with 1,4-benzene-dithiolate (BDT). We estimate the essential structural and electronic parameters for this system based on ab initio density functional calculations (DFT) for some simple <span class="hlt">model</span> systems involving thiol groups and <span class="hlt">Fe</span> clusters as well as semi-empirical considerations and the known electronic structure of bulk <span class="hlt">Fe</span>. We then use Lippmann-Schwinger and Green's function techniques together with the Landauer formalism to study spin-dependent transport. *E. G. Emberly and G. Kirczenow, Chem. Phys. 281, 311 (2002); R. Pati, L. Senapati, P.M. Ajayan and S.K. Nayak, Phys. Rev. B68, 100407 (2003).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2007AIPC..907..564R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2007AIPC..907..564R"><span><span class="hlt">FE</span> Simulation of Ultrasonic Back Extrusion</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Rosochowska, Malgorzata; Rosochowski, Andrzej</p> <p>2007-04-01</p> <p>The main benefit of using ultrasonic vibrations in metal forming arises from the reduction in the mean forming force. In order to examine mechanisms responsible for this effect <span class="hlt">FE</span> simulations of ultrasonic back extrusion using ABAQUS/Explicit were carried out. In two analysed <span class="hlt">models</span>, vibration of frequency of 20 kHz was imposed on the punch. In the first <span class="hlt">model</span>, the die and the punch were defined as rigid bodies and in the second, the punch was <span class="hlt">modelled</span> as an elastic body, this being the innovative feature of the research. The punch vibrated in a longitudinal mode. Simulations were performed for amplitude of vibrations of 8.5μm and different punch velocities for both friction and frictionless conditions. Results showed that the amplitude and the mean forming force depended on the process velocity. Further, the decrease in the mean forming force might be <span class="hlt">partly</span> explained by the reduction in the friction force due to changes in the direction and magnitude of the frictional stress over the vibration period. A lower deflection of the elastic punch under oscillatory conditions was observed, which was an indirect evidence of the reduced forming force. It was also observed that amplitude of vibrations at the working surface of the elastic punch was smaller than the applied one.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015MMTB...46.2593B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015MMTB...46.2593B"><span>Transmission Line <span class="hlt">Modeling</span> Applied to Hot Corrosion of <span class="hlt">Fe</span>-40at.pctAl in Molten LiCl-KCl</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Barraza-Fierro, Jesus Israel; Espinosa-Medina, Marco Antonio; Castaneda, Homero</p> <p>2015-12-01</p> <p>The effect of Cu and Li additions to the intermetallic alloy <span class="hlt">Fe</span>-40at.pctAl on the corrosion performance in an LiCl-55wtpctKCl molten eutectic salt was studied by means of electrochemical impedance spectroscopy, transmission line <span class="hlt">modeling</span> (TLM), and cathodic polarization. The tests were done at 723 K, 773 K, and 823 K (450 °C, 500 °C, and 550 °C), for 60 and 720 minutes. The element additions could improve the corrosion resistance of <span class="hlt">Fe</span>-40at.pctAl in molten LiCl-KCl, while TLM could characterize and quantify the interfacial processes in hot corrosion. The polarization curves helped to establish the possible cathodic reactions in the experimental conditions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JAP...117a3906Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JAP...117a3906Z"><span>Multiple resonance peaks of <span class="hlt">Fe</span>Co thin films with Ni<span class="hlt">Fe</span> underlayer</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhong, Xiaoxi; Soh, Wee Tee; Phuoc, Nguyen N.; Liu, Ying; Ong, C. K.</p> <p>2015-01-01</p> <p>Under zero external magnetic fields, single-layer <span class="hlt">Fe</span>Co thin films exhibit no ferromagnetic resonance (FMR) peaks, while multiple FMR peaks were obtained by growing <span class="hlt">Fe</span>Co thin films on Ni<span class="hlt">Fe</span> underlayers with various thicknesses up to 50 nm. Comprehensive investigations of the dynamic magnetic properties and origin of the peaks were conducted through measurements of microwave permeability via a shorted microstrip perturbation technique. Through fitted values of saturation magnetization Ms, uniaxial anisotropy HKsta, and rotatable anisotropy HKrot extracted from the FMR experiments, it was found that two of the three resonance peaks originate from <span class="hlt">Fe</span>Co, and the third from Ni<span class="hlt">Fe</span>. The two magnetic phases of <span class="hlt">Fe</span>Co grains are found to have different values of HKrot and explained by the exchange interaction between <span class="hlt">Fe</span>Co and Ni<span class="hlt">Fe</span> grains.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/25288471','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/25288471"><span>Iron allocation in leaves of <span class="hlt">Fe</span>-deficient cucumber plants fed with natural <span class="hlt">Fe</span> complexes.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Zanin, Laura; Tomasi, Nicola; Rizzardo, Cecilia; Gottardi, Stefano; Terzano, Roberto; Alfeld, Matthias; Janssens, Koen; De Nobili, Maria; Mimmo, Tanja; Cesco, Stefano</p> <p>2015-05-01</p> <p>Iron (<span class="hlt">Fe</span>) sources available for plants in the rhizospheric solution are mainly a mixture of complexes between <span class="hlt">Fe</span> and organic ligands, including phytosiderophores (PS) and water-extractable humic substances (WEHS). In comparison with the other <span class="hlt">Fe</span> sources, <span class="hlt">Fe</span>-WEHS are more efficiently used by plants, and experimental evidences show that <span class="hlt">Fe</span> translocation contributes to this better response. On the other hand, very little is known on the mechanisms involved in <span class="hlt">Fe</span> allocation in leaves. In this work, physiological and molecular processes involved in <span class="hlt">Fe</span> distribution in leaves of <span class="hlt">Fe</span>-deficient Cucumis sativus supplied with <span class="hlt">Fe</span>-PS or <span class="hlt">Fe</span>-WEHS up to 5 days were studied combining different techniques, such as radiochemical experiments, synchrotron micro X-ray fluorescence, real-time reverse transcription polymerase chain reaction and in situ hybridization. In <span class="hlt">Fe</span>-WEHS-fed plants, <span class="hlt">Fe</span> was rapidly (1 day) allocated into the leaf veins, and after 5 days, <span class="hlt">Fe</span> was completely transferred into interveinal cells; moreover, the amount of accumulated <span class="hlt">Fe</span> was much higher than with <span class="hlt">Fe</span>-PS. This redistribution in <span class="hlt">Fe</span>-WEHS plants was associated with an upregulation of genes encoding a ferric(III) -chelate reductase (FRO), a <span class="hlt">Fe</span>(2+) transporter (IRT1) and a natural resistance-associated macrophage protein (NRAMP). The localization of FRO and IRT1 transcripts next to the midveins, beside that of NRAMP in the interveinal area, may suggest a rapid and efficient response induced by the presence of <span class="hlt">Fe</span>-WEHS in the extra-radical solution for the allocation in leaves of high amounts of <span class="hlt">Fe</span>. In conclusion, <span class="hlt">Fe</span> is more efficiently used when chelated to WEHS than PS and seems to involve <span class="hlt">Fe</span> distribution and gene regulation of <span class="hlt">Fe</span> acquisition mechanisms operating in leaves. © 2014 Scandinavian Plant Physiology Society.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/9751716','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/9751716"><span>[3<span class="hlt">Fe</span>-4S] to [4<span class="hlt">Fe</span>-4S] cluster conversion in Desulfovibrio fructosovorans [Ni<span class="hlt">Fe</span>] hydrogenase by site-directed mutagenesis.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Rousset, M; Montet, Y; Guigliarelli, B; Forget, N; Asso, M; Bertrand, P; Fontecilla-Camps, J C; Hatchikian, E C</p> <p>1998-09-29</p> <p>The role of the high potential [3<span class="hlt">Fe</span>-4S]1+,0 cluster of [Ni<span class="hlt">Fe</span>] hydrogenase from Desulfovibrio species located halfway between the proximal and distal low potential [4<span class="hlt">Fe</span>-4S]2+,1+ clusters has been investigated by using site-directed mutagenesis. Proline 238 of Desulfovibrio fructosovorans [Ni<span class="hlt">Fe</span>] hydrogenase, which occupies the position of a potential ligand of the lacking fourth <span class="hlt">Fe</span>-site of the [3<span class="hlt">Fe</span>-4S] cluster, was replaced by a cysteine residue. The properties of the mutant enzyme were investigated in terms of enzymatic activity, EPR, and redox properties of the iron-sulfur centers and crystallographic structure. We have shown on the basis of both spectroscopic and x-ray crystallographic studies that the [3<span class="hlt">Fe</span>-4S] cluster of D. fructosovorans hydrogenase was converted into a [4<span class="hlt">Fe</span>-4S] center in the P238 mutant. The [3<span class="hlt">Fe</span>-4S] to [4<span class="hlt">Fe</span>-4S] cluster conversion resulted in a lowering of approximately 300 mV of the midpoint potential of the modified cluster, whereas no significant alteration of the spectroscopic and redox properties of the two native [4<span class="hlt">Fe</span>-4S] clusters and the Ni<span class="hlt">Fe</span> center occurred. The significant decrease of the midpoint potential of the intermediate <span class="hlt">Fe</span>-S cluster had only a slight effect on the catalytic activity of the P238C mutant as compared with the wild-type enzyme. The implications of the results for the role of the high-potential [3<span class="hlt">Fe</span>-4S] cluster in the intramolecular electron transfer pathway are discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=21691','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=21691"><span>[3<span class="hlt">Fe</span>-4S] to [4<span class="hlt">Fe</span>-4S] cluster conversion in Desulfovibrio fructosovorans [Ni<span class="hlt">Fe</span>] hydrogenase by site-directed mutagenesis</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Rousset, Marc; Montet, Yael; Guigliarelli, Bruno; Forget, Nicole; Asso, Marcel; Bertrand, Patrick; Fontecilla-Camps, Juan C.; Hatchikian, E. Claude</p> <p>1998-01-01</p> <p>The role of the high potential [3<span class="hlt">Fe</span>-4S]1+,0 cluster of [Ni<span class="hlt">Fe</span>] hydrogenase from Desulfovibrio species located halfway between the proximal and distal low potential [4<span class="hlt">Fe</span>-4S]2+,1+ clusters has been investigated by using site-directed mutagenesis. Proline 238 of Desulfovibrio fructosovorans [Ni<span class="hlt">Fe</span>] hydrogenase, which occupies the position of a potential ligand of the lacking fourth <span class="hlt">Fe</span>-site of the [3<span class="hlt">Fe</span>-4S] cluster, was replaced by a cysteine residue. The properties of the mutant enzyme were investigated in terms of enzymatic activity, EPR, and redox properties of the iron-sulfur centers and crystallographic structure. We have shown on the basis of both spectroscopic and x-ray crystallographic studies that the [3<span class="hlt">Fe</span>-4S] cluster of D. fructosovorans hydrogenase was converted into a [4<span class="hlt">Fe</span>-4S] center in the P238 mutant. The [3<span class="hlt">Fe</span>-4S] to [4<span class="hlt">Fe</span>-4S] cluster conversion resulted in a lowering of approximately 300 mV of the midpoint potential of the modified cluster, whereas no significant alteration of the spectroscopic and redox properties of the two native [4<span class="hlt">Fe</span>-4S] clusters and the Ni<span class="hlt">Fe</span> center occurred. The significant decrease of the midpoint potential of the intermediate <span class="hlt">Fe</span>-S cluster had only a slight effect on the catalytic activity of the P238C mutant as compared with the wild-type enzyme. The implications of the results for the role of the high-potential [3<span class="hlt">Fe</span>-4S] cluster in the intramolecular electron transfer pathway are discussed. PMID:9751716</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015AGUFMSA23A2328L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015AGUFMSA23A2328L"><span><span class="hlt">Model</span> Simulation of Ionosphere Electron Density with Dynamic Transportation and Mechanism of Sporadic E Layers in Lower <span class="hlt">Part</span> of Ionosphere</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Lin, Y. C.; Chu, Y. H.</p> <p>2015-12-01</p> <p>There are many physical theories responsible for explanation the generation mechanism of sporadic E (Es) plasma irregularities. In middle latitude, it's generally believed that sporadic E layers occur in vertical ion convergent areas driven by horizontal neutral wind shear. The sporadic E layers appear characteristic of abundant metallic ion species (i.e., <span class="hlt">Fe</span>+, Mg+, Na+), that lifetime are longer than molecular ions by a factor of several orders, have been demonstrated by rocket-borne mass spectrometric measurements. On the basic of the GPS Radio Occultation (RO), using the scintillations of the GPS signal-to-noise ratio and intense fluctuation of excess phase, the global and seasonal sporadic E layers occurrence rates could be retrieved. In our previous study we found there is averaged 10 kilometers shift in height between the COSMIC-retrieved sporadic E layer occurrence rate and the sporadic E occurrence rate <span class="hlt">modeled</span> from considering the convergence/divergence of <span class="hlt">Fe</span>+ vertical flux. There are many reasons that maybe result in the altitude differences, e.g., tidal wind with phase shift, electric field driven force, iron species distributions. In this research, the quantitative analyses for electric field drives Es layers translations in vertical direction are presented. The tidal wind driven sporadic E layers have been simulating by <span class="hlt">modeling</span> several nonmetallic ions (O+(4S), O+(2D), O+(2p), N+, N2+, O2+, NO+) and metallic ions (<span class="hlt">Fe</span>+, <span class="hlt">Fe</span>O2+, <span class="hlt">Fe</span>N2+, <span class="hlt">Fe</span>O+) with wind shear transportation. The simulation result shows the <span class="hlt">Fe</span>+ particles accumulate at zonal wind shear convergent regions and form the thin sporadic E layers. With the electric field taking into account, the whole shape of sporadic E layers vertical shift 2~5 km that depending on what magnitude and direction of electric field is added.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018JMEP...27.2089M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018JMEP...27.2089M"><span>Adhesive and Cohesive Strength in <span class="hlt">FeB/Fe</span>2B Systems</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Meneses-Amador, A.; Blancas-Pérez, D.; Corpus-Mejía, R.; Rodríguez-Castro, G. A.; Martínez-Trinidad, J.; Jiménez-Tinoco, L. F.</p> <p>2018-05-01</p> <p>In this work, <span class="hlt">FeB/Fe</span>2B systems were evaluated by the scratch test. The powder-pack boriding process was performed on the surface of AISI M2 steel. The mechanical parameters, such as yield stress and Young's modulus of the boride layer, were obtained by the instrumented indentation technique. Residual stresses produced on the boride layer were estimated by using the x-ray diffraction (XRD) technique. The scratch test was performed in order to evaluate the cohesive/adhesive strength of the <span class="hlt">FeB/Fe</span>2B coating. In addition, a numerical evaluation of the scratch test on boride layers was performed by the finite element method. Maximum principal stresses were related to the failure mechanisms observed by the experimental scratch test. Shear stresses at the interfaces of the <span class="hlt">FeB/Fe</span>2B/substrate system were also evaluated. Finally, the results obtained provide essential information about the effect of the layer thickness, the residual stresses, and the resilience modulus on the cohesive/adhesive strength in <span class="hlt">FeB/Fe</span>2B systems.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2005MeScT..16..363S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2005MeScT..16..363S"><span>Viscosities of <span class="hlt">Fe</span> Ni, <span class="hlt">Fe</span> Co and Ni Co binary melts</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Sato, Yuzuru; Sugisawa, Koji; Aoki, Daisuke; Yamamura, Tsutomu</p> <p>2005-02-01</p> <p>Viscosities of three binary molten alloys consisting of the iron group elements, <span class="hlt">Fe</span>, Ni and Co, have been measured by using an oscillating cup viscometer over the entire composition range from liquidus temperatures up to 1600 °C with high precision and excellent reproducibility. The viscosities measured showed good Arrhenius linearity for all the compositions. The viscosities of <span class="hlt">Fe</span>, Ni and Co as a function of temperature are as follows: \\eqalign{ & \\log \\eta={-}0.6074 + 2493/T\\qquad for\\quad <span class="hlt">Fe</span>\\\\ & \\log \\eta={-}0.5695 + 2157/T\\qquad for\\quad Ni \\\\ & \\log \\eta={-}0.6620 + 2430/T\\qquad for\\quad Co.} The isothermal viscosities of <span class="hlt">Fe</span>-Ni and <span class="hlt">Fe</span>-Co binary melts increase monotonically with increasing <span class="hlt">Fe</span> content. On the other hand, in Ni-Co binary melt, the isothermal viscosity decreases slightly and then increases with increasing Co. The activation energy of <span class="hlt">Fe</span>-Co binary melt increased slightly on mixing, and those of <span class="hlt">Fe</span>-Ni and Ni-Co melts decreased monotonically with increasing Ni content. The above behaviour is discussed based on the thermodynamic properties of the alloys.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1195807-radiation-tolerance-neutron-irradiated-model-fe-cr-al-alloys','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1195807-radiation-tolerance-neutron-irradiated-model-fe-cr-al-alloys"><span>Radiation tolerance of neutron-irradiated <span class="hlt">model</span> <span class="hlt">Fe</span>-Cr-Al alloys</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Field, Kevin G.; Hu, Xunxiang; Littrell, Kenneth C.; ...</p> <p>2015-07-14</p> <p>The <span class="hlt">Fe</span> Cr Al alloy system has the potential to form an important class of enhanced accident-tolerant cladding materials in the nuclear power industry owing to the alloy system's higher oxidation resistance in high-temperature steam environments compared with traditional zirconium-based alloys. However, radiation tolerance of <span class="hlt">Fe</span> Cr Al alloys has not been fully established. In this study, a series of <span class="hlt">Fe</span> Cr Al alloys with 10 18 wt % Cr and 2.9 4.9 wt % Al were neutron irradiated at 382 C to 1.8 dpa to investigate the irradiation-induced microstructural and mechanical property evolution as a function of alloy composition.more » Dislocation loops with Burgers vector of a/2 111 and a 100 were detected and quantified. Results indicate precipitation of Cr-rich is primarily dependent on the bulk chromium composition. Mechanical testing of sub-size-irradiated tensile specimens indicates the hardening response seen after irradiation is dependent on the bulk chromium composition. Furthermore, a structure property relationship was developed; it indicated that the change in yield strength after irradiation is caused by the formation of these radiation-induced defects and is dominated by the large number density of Cr-rich α' precipitates at sufficiently high chromium contents after irradiation.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/28884175','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/28884175"><span>Protonation/reduction dynamics at the [4<span class="hlt">Fe</span>-4S] cluster of the hydrogen-forming cofactor in [<span class="hlt">FeFe</span>]-hydrogenases.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Senger, Moritz; Mebs, Stefan; Duan, Jifu; Shulenina, Olga; Laun, Konstantin; Kertess, Leonie; Wittkamp, Florian; Apfel, Ulf-Peter; Happe, Thomas; Winkler, Martin; Haumann, Michael; Stripp, Sven T</p> <p>2018-01-31</p> <p>The [<span class="hlt">FeFe</span>]-hydrogenases of bacteria and algae are the most efficient hydrogen conversion catalysts in nature. Their active-site cofactor (H-cluster) comprises a [4<span class="hlt">Fe</span>-4S] cluster linked to a unique diiron site that binds three carbon monoxide (CO) and two cyanide (CN - ) ligands. Understanding microbial hydrogen conversion requires elucidation of the interplay of proton and electron transfer events at the H-cluster. We performed real-time spectroscopy on [<span class="hlt">FeFe</span>]-hydrogenase protein films under controlled variation of atmospheric gas composition, sample pH, and reductant concentration. Attenuated total reflection Fourier-transform infrared spectroscopy was used to monitor shifts of the CO/CN - vibrational bands in response to redox and protonation changes. Three different [<span class="hlt">FeFe</span>]-hydrogenases and several protein and cofactor variants were compared, including element and isotopic exchange studies. A protonated equivalent (HoxH) of the oxidized state (Hox) was found, which preferentially accumulated at acidic pH and under reducing conditions. We show that the one-electron reduced state Hred' represents an intrinsically protonated species. Interestingly, the formation of HoxH and Hred' was independent of the established proton pathway to the diiron site. Quantum chemical calculations of the respective CO/CN - infrared band patterns favored a cysteine ligand of the [4<span class="hlt">Fe</span>-4S] cluster as the protonation site in HoxH and Hred'. We propose that proton-coupled electron transfer facilitates reduction of the [4<span class="hlt">Fe</span>-4S] cluster and prevents premature formation of a hydride at the catalytic diiron site. Our findings imply that protonation events both at the [4<span class="hlt">Fe</span>-4S] cluster and at the diiron site of the H-cluster are important in the hydrogen conversion reaction of [<span class="hlt">FeFe</span>]-hydrogenases.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014ApPhL.105h2904M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014ApPhL.105h2904M"><span><span class="hlt">Modeling</span> of hysteretic Schottky diode-like conduction in Pt/Bi<span class="hlt">Fe</span>O3/SrRuO3 switches</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Miranda, E.; Jiménez, D.; Tsurumaki-Fukuchi, A.; Blasco, J.; Yamada, H.; Suñé, J.; Sawa, A.</p> <p>2014-08-01</p> <p>The hysteresis current-voltage (I-V) loops in Pt/Bi<span class="hlt">Fe</span>O3/SrRuO3 structures are simulated using a Schottky diode-like conduction <span class="hlt">model</span> with sigmoidally varying parameters, including series resistance correction and barrier lowering. The evolution of the system is represented by a vector in a 3D parameter space describing a closed trajectory with stationary states. It is shown that the hysteretic behavior is not only the result of a Schottky barrier height (SBH) variation arising from the Bi<span class="hlt">Fe</span>O3 polarization reversal but also a consequence of the potential drop distribution across the device. The SBH modulation is found to be remarkably lower (<0.07 eV) than previously reported (>0.5 eV). It is also shown that the p-type semiconducting nature of Bi<span class="hlt">Fe</span>O3 can explain the large ideality factors (>6) required to simulate the I-V curves as well as the highly asymmetric set and reset voltages (4.7 V and -1.9 V) exhibited by our devices.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_18");'>18</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li class="active"><span>20</span></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_20 --> <div id="page_21" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li class="active"><span>21</span></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="401"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/19950016978','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/19950016978"><span>Integrating O/S <span class="hlt">models</span> during conceptual design, <span class="hlt">part</span> 1</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Ebeling, Charles E.</p> <p>1994-01-01</p> <p>The University of Dayton is pleased to submit this report to the National Aeronautics and Space Administration (NASA), Langley Research Center, which integrates a set of <span class="hlt">models</span> for determining operational capabilities and support requirements during the conceptual design of proposed space systems. This research provides for the integration of the reliability and maintainability (R&M) <span class="hlt">model</span>, both new and existing simulation <span class="hlt">models</span>, and existing operations and support (O&S) costing equations in arriving at a complete analysis methodology. Details concerning the R&M <span class="hlt">model</span> and the O&S costing <span class="hlt">model</span> may be found in previous reports accomplished under this grant (NASA Research Grant NAG1-1327). In the process of developing this comprehensive analysis approach, significant enhancements were made to the R&M <span class="hlt">model</span>, updates to the O&S costing <span class="hlt">model</span> were accomplished, and a new simulation <span class="hlt">model</span> developed. This is the 1st <span class="hlt">part</span> of a 3 <span class="hlt">part</span> technical report.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/22774845','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/22774845"><span>Structural and spectroscopic features of mixed valent <span class="hlt">Fe(II)Fe</span>(I) complexes and factors related to the rotated configuration of diiron hydrogenase.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Hsieh, Chung-Hung; Erdem, Ozlen F; Harman, Scott D; Singleton, Michael L; Reijerse, Edward; Lubitz, Wolfgang; Popescu, Codrina V; Reibenspies, Joseph H; Brothers, Scott M; Hall, Michael B; Darensbourg, Marcetta Y</p> <p>2012-08-08</p> <p>The compounds of this study have yielded to complementary structural, spectroscopic (Mössbauer, EPR/ENDOR, IR), and computational probes that illustrate the fine control of electronic and steric features that are involved in the two structural forms of (μ-SRS)[<span class="hlt">Fe</span>(CO)2PMe3]2(0,+) complexes. The installation of bridgehead bulk in the -SCH2CR2CH2S- dithiolate (R = Me, Et) <span class="hlt">model</span> complexes produces 6-membered <span class="hlt">Fe</span>S2C3 cyclohexane-type rings that produce substantial distortions in <span class="hlt">Fe(I)Fe</span>(I) precursors. Both the innocent (Fc(+)) and the noninnocent or incipient (NO(+)/CO exchange) oxidations result in complexes with inequivalent iron centers in contrast to the <span class="hlt">Fe(I)Fe</span>(I) derivatives. In the <span class="hlt">Fe(II)Fe</span>(I) complexes of S = 1/2, there is complete inversion of one square pyramid relative to the other with strong super hyperfine coupling to one PMe3 and weak SHFC to the other. Remarkably, diamagnetic complexes deriving from isoelectronic replacement of CO by NO(+), {(μ-SRS)[<span class="hlt">Fe</span>(CO)2PMe3] [<span class="hlt">Fe</span>(CO)(NO)PMe3](+)}, are also rotated and exist in only one isomeric form with the -SCH2CR2CH2S- dithiolates, in contrast to R = H ( Olsen , M. T. ; Bruschi , M. ; De Gioia , L. ; Rauchfuss , T. B. ; Wilson , S. R. J. Am. Chem. Soc. 2008 , 130 , 12021 -12030 ). The results and redox levels determined from the extensive spectroscopic analyses have been corroborated by gas-phase DFT calculations, with the primary spin density either localized on the rotated iron in the case of the S = 1/2 compound, or delocalized over the {<span class="hlt">Fe</span>(NO)} unit in the S = 0 complex. In the latter case, the nitrosyl has effectively shifted electron density from the <span class="hlt">Fe(I)Fe</span>(I) bond, repositioning it onto the spin coupled <span class="hlt">Fe</span>-N-O unit such that steric repulsion is sufficient to induce the rotated structure in the <span class="hlt">Fe(II)-{Fe</span>(I)((•)NO)}(8) derivatives.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/servlets/purl/884798','SCIGOV-STC'); return false;" href="https://www.osti.gov/servlets/purl/884798"><span>Study of X-ray photoionized <span class="hlt">Fe</span> plasma and comparisons with astrophysical <span class="hlt">modeling</span> codes</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Foord, M E; Heeter, R F; Chung, H</p> <p></p> <p>The charge state distributions of <span class="hlt">Fe</span>, Na and F are determined in a photoionized laboratory plasma using high resolution x-ray spectroscopy. Independent measurements of the density and radiation flux indicate the ionization parameter {zeta} in the plasma reaches values {zeta} = 20-25 erg cm s{sup -1} under near steady-state conditions. A curve-of-growth analysis, which includes the effects of velocity gradients in a one-dimensional expanding plasma, fits the observed line opacities. Absorption lines are tabulated in the wavelength region 8-17 {angstrom}. Initial comparisons with a number of astrophysical x-ray photoionization <span class="hlt">models</span> show reasonable agreement.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://www.dtic.mil/docs/citations/ADA348598','DTIC-ST'); return false;" href="http://www.dtic.mil/docs/citations/ADA348598"><span>Investigation of the Constitutive <span class="hlt">Model</span> Used in Nonlinear, Incremental Structural Analyses.</span></a></p> <p><a target="_blank" href="http://www.dtic.mil/">DTIC Science & Technology</a></p> <p></p> <p>1998-06-01</p> <p>package, ABAQUS , was chosen for performing NISA studies in <span class="hlt">part</span> because user supplied subroutines could be used for constitutive relationships. After a...loading and the shrinkage and thermally induced strains determined from control specimens. The majority of creep tests are uniaxial compressive tests...Kennedy, and Perry (1970). Description of <span class="hlt">FE</span> <span class="hlt">Model</span> The tests were simulated using the finite element (<span class="hlt">FE</span>) program ABAQUS and the aging viscoelastic</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015APS..MARS30003A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015APS..MARS30003A"><span>Hyperfine fields of <span class="hlt">Fe</span> in Nd2<span class="hlt">Fe</span>14BandSm2<span class="hlt">Fe</span>17N3</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Akai, Hisazumi; Ogura, Masako</p> <p>2015-03-01</p> <p>High saturation magnetization of rare-earth magnets originates from <span class="hlt">Fe</span> and the strong magnetic anisotropy stems from f-states of rare-earth elements such as Nd and Sm. Therefore the hyperfine fields of both <span class="hlt">Fe</span> and rare-earth provide us with important pieces of information: <span class="hlt">Fe</span> NMR enable us to detect site dependence of the local magnetic moment and magnetic anisotropy (<span class="hlt">Fe</span> sites also contribute to the magnetic anisotropy) while rare-earth NQR directly give the information of electric field gradients (EFG) that are related to the shape of the f-electron cloud as well as the EFG produced by ligands. In this study we focus on the hyperfine fields of materials used as permanent magnets, Nd2<span class="hlt">Fe</span>14BandSm2<span class="hlt">Fe</span>17N3 from theoretical points of view. The detailed electronic structure together with the hyperfine interactions are discussed on the basis of the first-principles calculation. In particular, the relations between the observed hyperfine fields and the magnetic properties are studies in detail. The effects of doping of those materials by other elements such as Dy and the effects of N adding in Sm2<span class="hlt">Fe</span>17N3 will be discussed. This work was supported by Elements Strategy Initiative Center for Magnetic Materials Project, the Ministry of Education, Culture, Sports, Science and Technology, Japan.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015APS..MAR.W7001Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015APS..MAR.W7001Z"><span>disorder effect on quantum transport properties of ultra thin <span class="hlt">Fe</span> film</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhang, Xiaotian; Nakamura, Kohji; Shindou, Ryuichi</p> <p>2015-03-01</p> <p>Ferromagnetic ultrathin films are experimentally known to often exhibit perpendicular magnetic anisotropy, when being placed on certain substrates. Based on reported ab-initio band calculations of free-standing <span class="hlt">Fe</span>-monolayer and that on MgO substrate, we will introduce an effective tight-binding <span class="hlt">model</span>, which capture a <span class="hlt">part</span> of an electronic structure near Fermi level for both cases. We will show that the <span class="hlt">model</span> supports electronic bands with non-zero Chern number and chiral edge modes which cross a direct band gap on the order of 50meV. Unluckily, however, the direct band gap is also masked by another dispersive bands which have non-zero Berry's curvature in the k-space. To demonstrate how disorder kills conducting characters of the latter bulk bands while leave intact those of the chiral edge modes, we will clarify behaviors of localization length and conductance in the effective <span class="hlt">model</span> with on-site disorders.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.fs.usda.gov/treesearch/pubs/53312','TREESEARCH'); return false;" href="https://www.fs.usda.gov/treesearch/pubs/53312"><span>Forest resources of the Santa <span class="hlt">Fe</span> National Forest</span></a></p> <p><a target="_blank" href="http://www.fs.usda.gov/treesearch/">Treesearch</a></p> <p>Dana Lambert</p> <p>2004-01-01</p> <p>The Interior West Forest Inventory and Analysis (IWFIA) program of the USDA Forest Service, Rocky Mountain Research Station, as <span class="hlt">part</span> of its national Forest Inventory and Analysis (FIA) duties, conducted forest resource inventories of the Southwestern Region (Region 3) National Forests. This report presents highlights of the Santa <span class="hlt">Fe</span> National Forest 1998...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://ntrs.nasa.gov/search.jsp?R=20070034483&hterms=EXERCISE+DEPENDENCE&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3DEXERCISE%2BDEPENDENCE','NASA-TRS'); return false;" href="https://ntrs.nasa.gov/search.jsp?R=20070034483&hterms=EXERCISE+DEPENDENCE&qs=Ntx%3Dmode%2Bmatchall%26Ntk%3DAll%26N%3D0%26No%3D40%26Ntt%3DEXERCISE%2BDEPENDENCE"><span>The Effect of Metal Composition on <span class="hlt">Fe</span>-Ni Partition Behavior between Olivine and <span class="hlt">Fe</span>Ni-Metal, <span class="hlt">Fe</span>Ni-Carbide, <span class="hlt">Fe</span>Ni-Sulfide at Elevated Pressure</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Holzheid, Astrid; Grove, Timothy L.</p> <p>2005-01-01</p> <p>Metal-olivine <span class="hlt">Fe</span>-Ni exchange distribution coefficients were determined at 1500 C over the pressure range of 1 to 9 GPa for solid and liquid alloy compositions. The metal alloy composition was varied with respect to the <span class="hlt">Fe</span>/Ni ratio and the amount of dissolved carbon and sulfur. The <span class="hlt">Fe</span>/Ni ratio of the metal phase exercises an important control on the abundance of Ni in the olivine. The Ni abundance in the olivine decreases as the <span class="hlt">Fe</span>/Ni ratio of the coexisting metal increases. The presence of carbon (up to approx. 3.5 wt.%) and sulfur (up to approx. 7.5 wt.%) in solution in the liquid <span class="hlt">Fe</span>-Ni-metal phase has a minor effect on the partitioning of <span class="hlt">Fe</span> and Ni between metal and olivine phases. No pressure dependence of the <span class="hlt">Fe</span>-Ni-metal-olivine exchange behavior in carbon- and sulfur-free and carbon- and sulfur-containing systems was found within the investigated pressure range. To match the Ni abundance in terrestrial mantle olivine, assuming an equilibrium metal-olivine distribution, a sub-chondritic <span class="hlt">Fe</span>/Ni-metal ratio that is a factor of 17 to 27 lower than the <span class="hlt">Fe</span>/Ni ratios in estimated Earth core compositions would be required, implying higher <span class="hlt">Fe</span> concentrations in the core forming metal phase. A simple metal-olivine equilibrium distribution does not seem to be feasible to explain the Ni abundances in the Earth's mantle. An equilibrium between metal and olivine does not exercise a control on the problem of Ni overabundance in the Earth's mantle. The experimental results do not contradict the presence of a magma ocean at the time of terrestrial core formation, if olivine was present in only minor amounts at the time of metal segregation.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015PhDT.......341K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015PhDT.......341K"><span>Synthesis, characterization and application of iron (II, III) oxide (<span class="hlt">Fe</span>3O4) magnetic nanoparticles in mimic of wound healing <span class="hlt">model</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Konyala, Divya</p> <p></p> <p>The research study focused on synthesis, characterization and applications of <span class="hlt">Fe</span>3O4 core-shelled magnetic nanomaterials. This <span class="hlt">Fe</span>3O4 magnetic nanomaterials will be prepared by using cost effective and convenient wet-chemistry method and will encapsulated using aqueous extracts of medicinal natural products. Three natural products namely Symplocos racemosa, Picrorhiza kurroa and Butea monosperma used to encapsulate <span class="hlt">Fe</span>3O 4 MNMs due to their scope to reduce the risk of cancer, improves health, increase energy and enhance the immunity. These three medicinal natural products are synthesize by using water as a solvents to derive its active constituents, which will further used to functionalize the magnetic nanomaterials. The magnetic nanoparticles characterization studies performed using X-ray powder diffraction, Scanning electron microscope, Transmission electron microscope, Ultraviolet-visible spectroscopy, Fourier Transform Infrared spectroscopy (FT-IR) and Magnetic property. <span class="hlt">Fe</span>3O4 magnetic nanomaterials biological activity was tested on Gram-negative bacteria (Escherichia coli). The results pointed out that, due to the adequate coating of <span class="hlt">Fe</span> 3O4 (Iron Oxide) core by the medicinal chemical constituents from the natural products, the absorption of <span class="hlt">Fe</span>3O4 magnetic nanomaterials was not detected in the UV-VIS Spectroscopy. TEM images showed that <span class="hlt">Fe</span>3O4 coated with natural product extract in core-shelled structure, and the size of the particle ranges from 6 nm to 10 nm. Fourier Transform Infrared spectroscopy (FT-IR) was performed to determine the nature of chemicals present in natural extracts and functionalized <span class="hlt">Fe</span>3O 4 magnetic nanomaterials. The <span class="hlt">model</span> of wound healing mimic and antibacterial activity performed on gram-negative (Escherichia coli), indicating steady increasing cell growth after adding <span class="hlt">Fe</span>3O4 MNMs. It was also found that MNMs synthesized at high temperatures shows less wound healing activity, when compared to MNMs prepared at room temperature due to formation</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018AIPC.1949n0002M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018AIPC.1949n0002M"><span><span class="hlt">Part</span>-to-itself <span class="hlt">model</span> inversion in process compensated resonance testing</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Mayes, Alexander; Jauriqui, Leanne; Biedermann, Eric; Heffernan, Julieanne; Livings, Richard; Aldrin, John C.; Goodlet, Brent; Mazdiyasni, Siamack</p> <p>2018-04-01</p> <p>Process Compensated Resonance Testing (PCRT) is a non-destructive evaluation (NDE) method involving the collection and analysis of a <span class="hlt">part</span>'s resonance spectrum to characterize its material or damage state. Prior work used the finite element method (FEM) to develop forward <span class="hlt">modeling</span> and <span class="hlt">model</span> inversion techniques. In many cases, the inversion problem can become confounded by multiple parameters having similar effects on a <span class="hlt">part</span>'s resonance frequencies. To reduce the influence of confounding parameters and isolate the change in a <span class="hlt">part</span> (e.g., creep), a <span class="hlt">part</span>-to-itself (PTI) approach can be taken. A PTI approach involves inverting only the change in resonance frequencies from the before and after states of a <span class="hlt">part</span>. This approach reduces the possible inversion parameters to only those that change in response to in-service loads and damage mechanisms. To evaluate the effectiveness of using a PTI inversion approach, creep strain and material properties were estimated in virtual and real samples using FEM inversion. Virtual and real dog bone samples composed of nickel-based superalloy Mar-M-247 were examined. Virtual samples were <span class="hlt">modeled</span> with typically observed variations in material properties and dimensions. Creep <span class="hlt">modeling</span> was verified with the collected resonance spectra from an incrementally crept physical sample. All samples were inverted against a <span class="hlt">model</span> space that allowed for change in the creep damage state and the material properties but was blind to initial <span class="hlt">part</span> dimensions. Results quantified the capabilities of PTI inversion in evaluating creep strain and material properties, as well as its sensitivity to confounding initial dimensions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2012-title49-vol1/pdf/CFR-2012-title49-vol1-sec38-179-app-id1054.pdf','CFR2012'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2012-title49-vol1/pdf/CFR-2012-title49-vol1-sec38-179-app-id1054.pdf"><span>49 CFR Appendix - Figures to <span class="hlt">Part</span> 38</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2012&page.go=Go">Code of Federal Regulations, 2012 CFR</a></p> <p></p> <p>2012-10-01</p> <p>... 49 Transportation 1 2012-10-01 2012-10-01 false Figures to <span class="hlt">Part</span> 38 Transportation Office of the Secretary of Transportation AMERICANS WITH DISABILITIES ACT (ADA) ACCESSIBILITY SPECIFICATIONS FOR TRANSPORTATION VEHICLES Other Vehicles and Systems Trams, and similar vehicles, and systems Pt. 38, Figures Figures to <span class="hlt">Part</span> 38 ER28SE98.000 EC02<span class="hlt">FE</span>91.194...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2011-title49-vol1/pdf/CFR-2011-title49-vol1-sec38-179-app-id979.pdf','CFR2011'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2011-title49-vol1/pdf/CFR-2011-title49-vol1-sec38-179-app-id979.pdf"><span>49 CFR Appendix - Figures to <span class="hlt">Part</span> 38</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-10-01</p> <p>... 49 Transportation 1 2011-10-01 2011-10-01 false Figures to <span class="hlt">Part</span> 38 Transportation Office of the Secretary of Transportation AMERICANS WITH DISABILITIES ACT (ADA) ACCESSIBILITY SPECIFICATIONS FOR TRANSPORTATION VEHICLES Other Vehicles and Systems Trams, and similar vehicles, and systems Pt. 38, Figures Figures to <span class="hlt">Part</span> 38 ER28SE98.000 EC02<span class="hlt">FE</span>91.194...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2013-title49-vol1/pdf/CFR-2013-title49-vol1-sec38-179-app-id1055.pdf','CFR2013'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2013-title49-vol1/pdf/CFR-2013-title49-vol1-sec38-179-app-id1055.pdf"><span>49 CFR Appendix - Figures to <span class="hlt">Part</span> 38</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2013&page.go=Go">Code of Federal Regulations, 2013 CFR</a></p> <p></p> <p>2013-10-01</p> <p>... 49 Transportation 1 2013-10-01 2013-10-01 false Figures to <span class="hlt">Part</span> 38 Transportation Office of the Secretary of Transportation AMERICANS WITH DISABILITIES ACT (ADA) ACCESSIBILITY SPECIFICATIONS FOR TRANSPORTATION VEHICLES Other Vehicles and Systems Trams, and similar vehicles, and systems Pt. 38, Figures Figures to <span class="hlt">Part</span> 38 ER28SE98.000 EC02<span class="hlt">FE</span>91.194...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/pages/biblio/1423190-kinetic-modelling-experimental-studies-effects-fe2+-ions-xylan-hydrolysis-dilute-acid-pretreatment-subsequent-enzymatic-hydrolysis','SCIGOV-DOEP'); return false;" href="https://www.osti.gov/pages/biblio/1423190-kinetic-modelling-experimental-studies-effects-fe2+-ions-xylan-hydrolysis-dilute-acid-pretreatment-subsequent-enzymatic-hydrolysis"><span>Kinetic <span class="hlt">Modelling</span> and Experimental Studies for the Effects of <span class="hlt">Fe</span> 2+ Ions on Xylan Hydrolysis with Dilute-Acid Pretreatment and Subsequent Enzymatic Hydrolysis</span></a></p> <p><a target="_blank" href="http://www.osti.gov/pages">DOE PAGES</a></p> <p>Wei, Hui; Chen, Xiaowen; Shekiro, Joseph; ...</p> <p>2018-01-20</p> <p>High-temperature (150-170 degrees C) pretreatment of lignocellulosic biomass with mineral acids is well established for xylan breakdown. <span class="hlt">Fe</span> 2+ is known to be a cocatalyst of this process although kinetics of its action remains unknown. The present work addresses the effect of ferrous ion concentration on sugar yield and degradation product formation from corn stover for the entire two-step treatment, including the subsequent enzymatic cellulose hydrolysis. The feedstock was impregnated with 0.5% acid and 0.75 mM iron cocatalyst, which was found to be optimal in preliminary experiments. The detailed kinetic data of acid pretreatment, with and without iron, was satisfactorilymore » <span class="hlt">modelled</span> with a four-step linear sequence of first-order irreversible reactions accounting for the formation of xylooligomers, xylose and furfural as intermediates to provide the values of Arrhenius activation energy. Based on this kinetic <span class="hlt">modelling</span>, <span class="hlt">Fe</span> 2+ turned out to accelerate all four reactions, with a significant alteration of the last two steps, that is, xylose degradation. Consistent with this <span class="hlt">model</span>, the greatest xylan conversion occurred at the highest severity tested under 170 ⁰C/30 min with 0.75 mM <span class="hlt">Fe</span> 2+, with a total of 8% xylan remaining in the pretreated solids, whereas the operational conditions leading to the highest xylose monomer yield, 63%, were milder, 150 degrees C with 0.75 mM <span class="hlt">Fe</span> 2+ for 20 min. Furthermore, the subsequent enzymatic hydrolysis with the prior addition of 0.75 mM of iron(II) increased the glucose production to 56.3% from 46.3% in the control (iron-free acid). The detailed analysis indicated that conducting the process at lower temperatures yet long residence times benefits the yield of sugars. The above kinetic <span class="hlt">modelling</span> results of <span class="hlt">Fe</span> 2+ accelerating all four reactions are in line with our previous mechanistic research showing that the pretreatment likely targets multiple chemistries in plant cell wall polymer networks, including those represented by</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/servlets/purl/1423190','SCIGOV-STC'); return false;" href="https://www.osti.gov/servlets/purl/1423190"><span>Kinetic <span class="hlt">Modelling</span> and Experimental Studies for the Effects of <span class="hlt">Fe</span> 2+ Ions on Xylan Hydrolysis with Dilute-Acid Pretreatment and Subsequent Enzymatic Hydrolysis</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Wei, Hui; Chen, Xiaowen; Shekiro, Joseph</p> <p></p> <p>High-temperature (150-170 degrees C) pretreatment of lignocellulosic biomass with mineral acids is well established for xylan breakdown. <span class="hlt">Fe</span> 2+ is known to be a cocatalyst of this process although kinetics of its action remains unknown. The present work addresses the effect of ferrous ion concentration on sugar yield and degradation product formation from corn stover for the entire two-step treatment, including the subsequent enzymatic cellulose hydrolysis. The feedstock was impregnated with 0.5% acid and 0.75 mM iron cocatalyst, which was found to be optimal in preliminary experiments. The detailed kinetic data of acid pretreatment, with and without iron, was satisfactorilymore » <span class="hlt">modelled</span> with a four-step linear sequence of first-order irreversible reactions accounting for the formation of xylooligomers, xylose and furfural as intermediates to provide the values of Arrhenius activation energy. Based on this kinetic <span class="hlt">modelling</span>, <span class="hlt">Fe</span> 2+ turned out to accelerate all four reactions, with a significant alteration of the last two steps, that is, xylose degradation. Consistent with this <span class="hlt">model</span>, the greatest xylan conversion occurred at the highest severity tested under 170 ⁰C/30 min with 0.75 mM <span class="hlt">Fe</span> 2+, with a total of 8% xylan remaining in the pretreated solids, whereas the operational conditions leading to the highest xylose monomer yield, 63%, were milder, 150 degrees C with 0.75 mM <span class="hlt">Fe</span> 2+ for 20 min. Furthermore, the subsequent enzymatic hydrolysis with the prior addition of 0.75 mM of iron(II) increased the glucose production to 56.3% from 46.3% in the control (iron-free acid). The detailed analysis indicated that conducting the process at lower temperatures yet long residence times benefits the yield of sugars. The above kinetic <span class="hlt">modelling</span> results of <span class="hlt">Fe</span> 2+ accelerating all four reactions are in line with our previous mechanistic research showing that the pretreatment likely targets multiple chemistries in plant cell wall polymer networks, including those represented by</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2016AGUFM.B14D..04A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2016AGUFM.B14D..04A"><span>Mass-dependent and -independent fractionation of <span class="hlt">Fe</span> isotopes in magnetotactic bacteria</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Amor, M.; Busigny, V.; Louvat, P.; Gelabert, A.; Cartigny, P.; Durand-Dubief, M.; Ona-Nguema, G.; Alphandéry, E.; Chebbi, I.; Guyot, F. J.</p> <p>2016-12-01</p> <p>Magnetotactic bacteria (MTB) perform biomineralization of intracellular magnetite (<span class="hlt">Fe</span>3O4) nanoparticles. Although they may be among the oldest microorganisms capable of biomineralization on Earth, identification of their activity in the geological record remains poorly resolved because of the lack of reliable signatures. Here, we determined <span class="hlt">Fe</span> isotope fractionation by the magnetotactic bacterium Magnetospirillum magneticum strain AMB-1 to better understand <span class="hlt">Fe</span> cycling in MTB and provide new signatures of the contribution of MTB to iron geochemistry. AMB-1 strain was cultivated with either <span class="hlt">Fe</span>(III)-quinate or <span class="hlt">Fe</span>(II)-ascorbate as <span class="hlt">Fe</span> sources. Iron isotope composition of <span class="hlt">Fe</span> sources, bacterial growth media after AMB-1 cultures, bacterial lysates (corresponding to AMB-1 cells devoid of magnetite) and magnetite samples were analyzed by MC-ICP-MS after column chromatography. In the two culture conditions, growth media after AMB-1 cultures were enriched in light <span class="hlt">Fe</span> isotopes relative to <span class="hlt">Fe</span> sources. Two distinct bacterial <span class="hlt">Fe</span> reservoirs were characterized in AMB-1: (1) magnetite enriched in the light <span class="hlt">Fe</span> isotopes by 1.5 to 2.5‰ in δ56<span class="hlt">Fe</span> relative to <span class="hlt">Fe</span> sources, and (2) lysate enriched in the heavy <span class="hlt">Fe</span> isotopes by 0.3 to 0.8‰ relative to <span class="hlt">Fe</span> sources. More importantly, mass-independent fractionations in odd (57<span class="hlt">Fe</span>) but not in even isotopes (54<span class="hlt">Fe</span>, 56<span class="hlt">Fe</span> and 58<span class="hlt">Fe</span>) were observed for the first time, highlighting a magnetic isotope effect. Magnetite samples were significantly enriched in 57<span class="hlt">Fe</span> by 0.23‰ relative to 54<span class="hlt">Fe</span>, 56<span class="hlt">Fe</span> and 58<span class="hlt">Fe</span>. Based on our results, we propose a <span class="hlt">model</span> for <span class="hlt">Fe</span> cycling and magnetite biomineralization in AMB-1, and propose to use this specific mass-independent signature of <span class="hlt">Fe</span> isotopes to evaluate the contribution of MTB to the iron biogeochemistry of recent and ancient environmental samples.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/1339087-neutron-irradiation-effects-fe-fe-cr','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/1339087-neutron-irradiation-effects-fe-fe-cr"><span>Neutron irradiation effects in <span class="hlt">Fe</span> and <span class="hlt">Fe</span>-Cr at 300 °C</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Chen, Wei-Ying; Miao, Yinbin; Gan, Jian</p> <p>2016-06-01</p> <p><span class="hlt">Fe</span> and <span class="hlt">Fe</span>-Cr (Cr = 10–16 at.%) specimens were neutron-irradiated at 300 °C to 0.01, 0.1 and 1 dpa. The TEM observations indicated that the Cr significantly reduced the mobility of dislocation loops and suppressed vacancy clustering, leading to distinct damage microstructures between <span class="hlt">Fe</span> and <span class="hlt">Fe</span>-Cr. Irradiation-induced dislocation loops in <span class="hlt">Fe</span> were heterogeneously observed in the vicinity of grown-in dislocations, whereas the loop distribution observed in <span class="hlt">Fe</span>-Cr is much more uniform. Voids were observed in the irradiated <span class="hlt">Fe</span> samples, but not in irradiated <span class="hlt">Fe</span>-Cr samples. Increasing Cr content in <span class="hlt">Fe</span>-Cr results in a higher density, and a smaller size ofmore » irradiation-induced dislocation loops. Orowan mechanism was used to correlate the observed microstructure and hardening, which showed that the hardening in <span class="hlt">Fe</span>-Cr can be attributed to the formation of dislocation loops and α' precipitates.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JNuM..456..162L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JNuM..456..162L"><span>Statistical <span class="hlt">model</span> and first-principles simulation on concentration of HenV cluster and He bubble formation in α-<span class="hlt">Fe</span> and W</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Liu, Yue-Lin; Yu, Yang; Dai, Zhen-Hong</p> <p>2015-01-01</p> <p>Using first-principles calculations, we investigate the stabilities of He and Hen-vacancy (HenV) clusters in α-<span class="hlt">Fe</span> and W. Vacancy formation energies are 2.08 eV in α-<span class="hlt">Fe</span> and 3.11 eV in W, respectively. Single He in both α-<span class="hlt">Fe</span> and W prefers to occupy the tetrahedral interstitial site. We recalculated the He solution energy considering the effect of zero-point energy (ZPE). The ZPEs of He in α-<span class="hlt">Fe</span> and W at the tetrahedral (octahedral) interstitial site are 0.072 eV (0.031 eV) and 0.078 eV (0.034 eV), respectively. The trapping energies of single He at vacancy in α-<span class="hlt">Fe</span> and W are -2.39 eV and -4.55 eV, respectively. By sequentially adding He into vacancy, a monovacancy trap up to 10 He atoms distributing in the vacancy vicinity. Based on the above results combined with statistical <span class="hlt">model</span>, we evaluate the concentrations of all relevant HenV clusters as a function of He chemical potential. The critical HenV concentration is found to be ∼10-40 (atomic) at the critical temperature T = 600 K in α-<span class="hlt">Fe</span> and T = 1600 K in W, respectively. Beyond the critical HenV concentrations, considerable HenV aggregate to form HenVm clusters. By further growing of HenVm, the HenVm clusters grow bigger resulting in the larger He bubble formation.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017PhDT........34O','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017PhDT........34O"><span>Starting points for the study of non-Fermi liquid-like properties of <span class="hlt">Fe</span>CrAs</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>O'Brien, Patrick James</p> <p></p> <p><span class="hlt">Fe</span>CrAs exhibits non-Fermi liquid-like behavior because of its odd combination of thermodynamic, transport, and magnetic properties. In particular, the resistivity of <span class="hlt">Fe</span>CrAs is not characteristic of a metal or an insulator and so remains a mystery. In this thesis, we seek a <span class="hlt">model</span> to describe its properties. In <span class="hlt">Fe</span>CrAs, local moments reside on the Cr sites, and there is some conduction. We study the simplest possible <span class="hlt">model</span> on the kagome lattice that features local moments and itinerant electrons, the kagome Kondo Lattice <span class="hlt">Model</span>. We present the phase diagram of this <span class="hlt">model</span>, which features a host of complex spin orders, one of which is the √3 x √3, the experimentally observed magnetic ground state in <span class="hlt">Fe</span>CrAs. The kagome Kondo Lattice <span class="hlt">Model</span>, having one itinerant d-orbital band on the kagome lattice, does not fully capture the microscopic physics of <span class="hlt">Fe</span>CrAs. The kagome Kondo Lattice <span class="hlt">Model</span> also will not de- scribe the mutilation of the Fermi surface. To investigate the microscopic properties, we calculated LDA and LDA+U results. These results and GGA results from another group all exhibit high d-orbital density of states at the Fermi energy as well as low p-orbital density of states at the Fermi energy. The DFT results motivated us to construct a <span class="hlt">model</span> based on the chemistry and full geometry of the <span class="hlt">Fe</span>CrAs crystal. The <span class="hlt">model</span> we construct is an effective hopping <span class="hlt">model</span> consisting of only d-orbital operators that we call the Optimal Overlap Hopping <span class="hlt">Model</span> (OOHM). We calculate the band structure that results from the OOHM, and this band structure can be compared to ARPES measurements. As an example of how one can use the OOHM, we calculate a dynamic spin structure factor from within the OOHM, and we compare it to neutron scattering data. We consider both the OOHM and the Kondo Lattice <span class="hlt">Model</span> on the kagome lattice as starting points from which we can launch studies of <span class="hlt">Fe</span>CrAs, and we present the existing theories for <span class="hlt">Fe</span>CrAs on a metallicity spectrum to illustrate the various</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4937429','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4937429"><span>Zero-valent <span class="hlt">Fe</span> confined mesoporous silica nanocarriers (<span class="hlt">Fe</span>(0) @ MCM-41) for targeting experimental orthotopic glioma in rats</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Shevtsov, M. A.; Parr, M. A.; Ryzhov, V. A.; Zemtsova, E. G.; Arbenin, A. Yu; Ponomareva, A. N.; Smirnov, V. M.; Multhoff, G.</p> <p>2016-01-01</p> <p>Mesoporous silica nanoparticles (MSNs) impregnated with zero-valent <span class="hlt">Fe</span> (<span class="hlt">Fe</span>(0) @ MCM-41) represent an attractive nanocarrier system for drug delivery into tumor cells. The major goal of this work was to assess whether MSNs can penetrate the blood-brain barrier in a glioblastoma rat <span class="hlt">model</span>. Synthesized MSNs nanomaterials were characterized by energy dispersive X-ray spectroscopy, measurements of X-ray diffraction, scanning electron microscopy and Mössbauer spectroscopy. For the detection of the MSNs by MR and for biodistribution studies MSNs were labeled with zero-valent <span class="hlt">Fe</span>. Subsequent magnetometry and nonlinear-longitudinal-response-M2 (NLR-M2) measurements confirmed the MR negative contrast enhancement properties of the nanoparticles. After incubation of different tumor (C6 glioma, U87 glioma, K562 erythroleukemia, HeLa cervix carcinoma) and normal cells such as fibroblasts and peripheral blood mononuclear cells (PBMCs) MSNs rapidly get internalized into the cytosol. Intracellular residing MSNs result in an enhanced cytotoxicity as <span class="hlt">Fe</span>(0) @ MCM-41 promote the reactive oxygen species production. MRI and histological studies indicated an accumulation of intravenously injected <span class="hlt">Fe</span>(0) @ MCM-41 MSNs in orthotopic C6 glioma <span class="hlt">model</span>. Biodistribution studies with measurements of second harmonic of magnetization demonstrated an increased and dose-dependent retention of MSNs in tumor tissues. Taken together, this study demonstrates that MSNs can enter the blood-brain barrier and accumulate in tumorous tissues. PMID:27386761</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_19");'>19</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li class="active"><span>21</span></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_21 --> <div id="page_22" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li class="active"><span>22</span></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="421"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3764369','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3764369"><span>New insights into <span class="hlt">Fe</span> localization in plant tissues</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Roschzttardtz, Hannetz; Conéjéro, Geneviève; Divol, Fanchon; Alcon, Carine; Verdeil, Jean-Luc; Curie, Catherine; Mari, Stéphane</p> <p>2013-01-01</p> <p>Deciphering cellular iron (<span class="hlt">Fe</span>) homeostasis requires having access to both quantitative and qualitative information on the subcellular pools of <span class="hlt">Fe</span> in tissues and their dynamics within the cells. We have taken advantage of the Perls/DAB <span class="hlt">Fe</span> staining procedure to perform a systematic analysis of <span class="hlt">Fe</span> distribution in roots, leaves and reproductive organs of the <span class="hlt">model</span> plant Arabidopsis thaliana, using wild-type and mutant genotypes affected in iron transport and storage. Roots of soil-grown plants accumulate iron in the apoplast of the central cylinder, a pattern that is strongly intensified when the citrate effluxer FRD3 is not functional, thus stressing the importance of citrate in the apoplastic movement of <span class="hlt">Fe</span>. In leaves, <span class="hlt">Fe</span> level is low and only detected in and around vascular tissues. In contrast, <span class="hlt">Fe</span> staining in leaves of iron-treated plants extends in the surrounding mesophyll cells where <span class="hlt">Fe</span> deposits, likely corresponding to <span class="hlt">Fe</span>-ferritin complexes, accumulate in the chloroplasts. The loss of ferritins in the fer1,3,4 triple mutant provoked a massive accumulation of <span class="hlt">Fe</span> in the apoplastic space, suggesting that in the absence of iron buffering in the chloroplast, cells activate iron efflux and/or repress iron influx to limit the amount of iron in the cell. In flowers, Perls/DAB staining has revealed a major sink for <span class="hlt">Fe</span> in the anthers. In particular, developing pollen grains accumulate detectable amounts of <span class="hlt">Fe</span> in small-size intracellular bodies that aggregate around the vegetative nucleus at the binuclear stage and that were identified as amyloplasts. In conclusion, using the Perls/DAB procedure combined to selected mutant genotypes, this study has established a reliable atlas of <span class="hlt">Fe</span> distribution in the main Arabidopsis organs, proving and refining long-assumed intracellular locations and uncovering new ones. This “iron map” of Arabidopsis will serve as a basis for future studies of possible actors of iron movement in plant tissues and cell compartments. PMID:24046774</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012AGUFMOS31D1766R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012AGUFMOS31D1766R"><span>Chemical leaching methods and measurements of marine labile particulate <span class="hlt">Fe</span></span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Revels, B. N.; John, S.</p> <p>2012-12-01</p> <p>. To explore the first hypothesis, we <span class="hlt">modeled</span> dissolution of <span class="hlt">Fe</span> from particles assuming two separate pools, labile and refractory. The <span class="hlt">model</span> produces a good fit to the data assuming 3mg/g of a labile <span class="hlt">Fe</span> pool with δ56<span class="hlt">Fe</span> = -0.9‰ and a refractory <span class="hlt">Fe</span> pool with δ56<span class="hlt">Fe</span> = +0.1‰. If the second hypothesis is true, and there is a kinetic isotope effect during dissolution, the similar relationship between amount of <span class="hlt">Fe</span> leached and δ56<span class="hlt">Fe</span> for both organic and mineral acids suggests that <span class="hlt">Fe</span> is leached from particles via proton-promoted dissolution. Several of these leaching techniques will be employed on sediment trap material from the Cariaco Basin to further investigate the relationship between δ56<span class="hlt">Fe</span> and the labile, bioavailable fraction of iron particles. A leach or series of leaches will be chosen to provide the most useful information about the bioavailability of iron from particles, and they will be applied to filtered particle samples from portions of the US GEOTRACES A10 (North Atlantic) transect. δ56<span class="hlt">Fe</span> values from particulate material in these regions will provide a better understanding of the sources of particulate iron to the ocean, and may help to trace how particulate iron is involved in global biogeochemical cycles.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015MMTA...46.5656Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015MMTA...46.5656Z"><span>Autonomous Repair Mechanism of Creep Damage in <span class="hlt">Fe</span>-Au and <span class="hlt">Fe</span>-Au-B-N Alloys</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhang, S.; Kwakernaak, C.; Tichelaar, F. D.; Sloof, W. G.; Kuzmina, M.; Herbig, M.; Raabe, D.; Brück, E.; van der Zwaag, S.; van Dijk, N. H.</p> <p>2015-12-01</p> <p>The autonomous repair mechanism of creep cavitation during high-temperature deformation has been investigated in <span class="hlt">Fe</span>-Au and <span class="hlt">Fe</span>-Au-B-N alloys. Combined electron-microscopy techniques and atom probe tomography reveal how the improved creep properties result from Au precipitation within the creep cavities, preferentially formed on grain boundaries oriented perpendicular to the applied stress. The selective precipitation of Au atoms at the free creep cavity surface results in pore filling, and thereby, autonomous repair of the creep damage. The large difference in atomic size between the Au and <span class="hlt">Fe</span> strongly hampers the nucleation of precipitates in the matrix. As a result, the matrix acts as a reservoir for the supersaturated solute until damage occurs. Grain boundaries and dislocations are found to act as fast transport routes for solute gold from the matrix to the creep cavities. The mechanism responsible for the self-healing can be characterized by a simple <span class="hlt">model</span> for cavity growth and cavity filling.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/27759364','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/27759364"><span><span class="hlt">Fe</span>2O3/Reduced Graphene Oxide/<span class="hlt">Fe</span>3O4 Composite in Situ Grown on <span class="hlt">Fe</span> Foil for High-Performance Supercapacitors.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Zhao, Chongjun; Shao, Xiaoxiao; Zhang, Yuxiao; Qian, Xiuzhen</p> <p>2016-11-09</p> <p>A <span class="hlt">Fe</span> 2 O 3 /reduced graphene oxide (RGO)/<span class="hlt">Fe</span> 3 O 4 nanocomposite in situ grown on <span class="hlt">Fe</span> foil was synthesized via a simple one-step hydrothermal growth process, where the iron foil served as support, reductant of graphene oxide, <span class="hlt">Fe</span> source of <span class="hlt">Fe</span> 3 O 4 , and also the current collector of the electrode. When it directly acted as the electrode of a supercapacitor, as-synthesized <span class="hlt">Fe</span> 2 O 3 /RGO/<span class="hlt">Fe</span> 3 O 4 @<span class="hlt">Fe</span> exhibited excellent electrochemical performance with a high capability of 337.5 mF/cm 2 at 20 mA/cm 2 and a superior cyclability with 2.3% capacity loss from the 600th to the 2000th cycle.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018PMag...98.1053S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018PMag...98.1053S"><span>Local configurations and atomic intermixing in as-quenched and annealed <span class="hlt">Fe</span>1-xCrx and <span class="hlt">Fe</span>1-xMox ribbons</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Stanciu, A. E.; Greculeasa, S. G.; Bartha, C.; Schinteie, G.; Palade, P.; Kuncser, A.; Leca, A.; Filoti, G.; Birsan, A.; Crisan, O.; Kuncser, V.</p> <p>2018-04-01</p> <p>Local atomic configuration, phase composition and atomic intermixing in <span class="hlt">Fe</span>-rich <span class="hlt">Fe</span>1-xCrx and <span class="hlt">Fe</span>1-xMox ribbons (x = 0.05, 0.10, 0.15), of potential interest for high-temperature applications and nuclear devices, are investigated in this study in relation to specific processing and annealing routes. The <span class="hlt">Fe</span>-based thin ribbons have been prepared by induction melting, followed by melt spinning and further annealed in He at temperatures up to 1250 °C. The complex structural, compositional and atomic configuration characterisation has been performed by means of X-ray diffraction (XRD), transmission Mössbauer spectroscopy and differential scanning calorimetry (TG-DSC). The XRD analysis indicates the formation of the desired solid solutions with body-centred cubic (bcc) structure in the as-quenched state. The Mössbauer spectroscopy results have been analysed in terms of the two-shell <span class="hlt">model</span>. The distribution of Cr/Mo atoms in the first two coordination spheres is not homogeneous, especially after annealing, as supported by the short-range order parameters. In addition, high-temperature annealing treatments give rise to oxidation of <span class="hlt">Fe</span> (to haematite, maghemite and magnetite) at the surface of the ribbons. <span class="hlt">Fe</span>1-xCrx alloys are structurally more stable than the Mo counterpart under annealing at 700 °C. Annealing at 1250 °C in He enhances drastically the Cr clustering around <span class="hlt">Fe</span> nuclei.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017AIPC.1864b0213L','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017AIPC.1864b0213L"><span>Study on SOC wavelet analysis for Li<span class="hlt">Fe</span>PO4 battery</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Liu, Xuepeng; Zhao, Dongmei</p> <p>2017-08-01</p> <p>Improving the prediction accuracy of SOC can reduce the complexity of the conservative and control strategy of the strategy such as the scheduling, optimization and planning of Li<span class="hlt">Fe</span>PO4 battery system. Based on the analysis of the relationship between the SOC historical data and the external stress factors, the SOC Estimation-Correction Prediction <span class="hlt">Model</span> based on wavelet analysis is established. Using wavelet neural network prediction <span class="hlt">model</span> is of high precision to achieve forecast link, external stress measured data is used to update parameters estimation in the <span class="hlt">model</span>, implement correction link, makes the forecast <span class="hlt">model</span> can adapt to the Li<span class="hlt">Fe</span>PO4 battery under rated condition of charge and discharge the operating point of the variable operation area. The test results show that the method can obtain higher precision prediction <span class="hlt">model</span> when the input and output of Li<span class="hlt">Fe</span>PO4 battery are changed frequently.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20110007290','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20110007290"><span><span class="hlt">FE</span> and MG Isotopic Analyses of Isotopically Unusual Presolar Silicate Grains</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Nguyen, A. N.; Messenger, S.; Ito, M.; Rahman, Z.</p> <p>2011-01-01</p> <p>Interstellar and circumstellar silicate grains are thought to be Mg-rich and <span class="hlt">Fe</span>-poor, based on astronomical observations and equilibrium condensation <span class="hlt">models</span> of silicate dust formation in stellar outflows. On the other hand, presolar silicates isolated from meteorites have surprisingly high <span class="hlt">Fe</span> contents and few Mg-rich grains are observed. The high <span class="hlt">Fe</span> contents in meteoritic presolar silicates may indicate they formed by a non-equilibrium condensation process. Alternatively, the <span class="hlt">Fe</span> in the stardust grains could have been acquired during parent body alteration. The origin of <span class="hlt">Fe</span> in presolar silicates may be deduced from its isotopic composition. Thus far, <span class="hlt">Fe</span> isotopic measurements of presolar silicates are limited to the <span class="hlt">Fe</span>-54/<span class="hlt">Fe</span>-56 ratios of 14 grains. Only two slight anomalies (albeit solar within error) were observed. However, these measurements suffered from contamination of <span class="hlt">Fe</span> from the adjacent meteorite matrix, which diluted any isotopic anomalies. We have isolated four presolar silicates having unusual O isotopic compositions by focused ion beam (FIB) milling and obtained their undiluted Mg and <span class="hlt">Fe</span> isotopic compositions. These compositions help to identify the grains stellar sources and to determine the source of <span class="hlt">Fe</span> in the grains.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/1047395-force-field-development-molecular-dynamics-nife-hydrogenase','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/1047395-force-field-development-molecular-dynamics-nife-hydrogenase"><span>Force Field Development and Molecular Dynamics of [Ni<span class="hlt">Fe</span>] Hydrogenase</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Smith, Dayle MA; Xiong, Yijia; Straatsma, TP</p> <p>2012-05-09</p> <p>Classical molecular force-field parameters describing the structure and motion of metal clusters in [Ni<span class="hlt">Fe</span>] hydrogenase enzymes can be used to compare the dynamics and thermodynamics of [Ni<span class="hlt">Fe</span>] under different oxidation, protonation, and ligation circumstances. Using density functional theory (DFT) calculations of small <span class="hlt">model</span> clusters representative of the active site and the proximal, medial, and distal <span class="hlt">Fe</span>/S metal centers and their attached protein side chains, we have calculated classical force-field parameters for [Ni<span class="hlt">Fe</span>] in reduced and oxidized states, including internal coordinates, force constants, and atom-centered charges. Derived force constants revealed that cysteinate ligands bound to the metal ions are more flexiblemore » in the Ni-B active site, which has a bridging hydroxide ligand, than in the Ni-C active site, which has a bridging hydride. Ten nanosecond all-atom, explicit-solvent MD simulations of [Ni<span class="hlt">Fe</span>] hydrogenase in oxidized and reduced catalytic states established the stability of the derived force-field parameters in terms of C{alpha} and metal cluster fluctuations. Average active site structures from the protein MD simulations are consistent with [Ni<span class="hlt">Fe</span>] structures from the Protein Data Bank, suggesting that the derived force-field parameters are transferrable to other hydrogenases beyond the structure used for testing. A comparison of experimental H{sub 2}-production rates demonstrated a relationship between cysteinate side chain rotation and activity, justifying the use of a fully dynamic <span class="hlt">model</span> of [Ni<span class="hlt">Fe</span>] metal cluster motion.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/27026402','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/27026402"><span>A Synthetic Single-Site <span class="hlt">Fe</span> Nitrogenase: High Turnover, Freeze-Quench (57)<span class="hlt">Fe</span> Mössbauer Data, and a Hydride Resting State.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Del Castillo, Trevor J; Thompson, Niklas B; Peters, Jonas C</p> <p>2016-04-27</p> <p>The mechanisms of the few known molecular nitrogen-fixing systems, including nitrogenase enzymes, are of much interest but are not fully understood. We recently reported that <span class="hlt">Fe</span>-N2 complexes of tetradentate P3(E) ligands (E = B, C) generate catalytic yields of NH3 under an atmosphere of N2 with acid and reductant at low temperatures. Here we show that these <span class="hlt">Fe</span> catalysts are unexpectedly robust and retain activity after multiple reloadings. Nearly an order of magnitude improvement in yield of NH3 for each <span class="hlt">Fe</span> catalyst has been realized (up to 64 equiv of NH3 produced per <span class="hlt">Fe</span> for P3(B) and up to 47 equiv for P3(C)) by increasing acid/reductant loading with highly purified acid. Cyclic voltammetry shows the apparent onset of catalysis at the P3(B)<span class="hlt">Fe</span>-N2/P3(B)<span class="hlt">Fe</span>-N2(-) couple and controlled-potential electrolysis of P3(B)<span class="hlt">Fe</span>(+) at -45 °C demonstrates that electrolytic N2 reduction to NH3 is feasible. Kinetic studies reveal first-order rate dependence on <span class="hlt">Fe</span> catalyst concentration (P3(B)), consistent with a single-site catalyst <span class="hlt">model</span>. An isostructural system (P3(Si)) is shown to be appreciably more selective for hydrogen evolution. In situ freeze-quench Mössbauer spectroscopy during turnover reveals an iron-borohydrido-hydride complex as a likely resting state of the P3(B)<span class="hlt">Fe</span> catalyst system. We postulate that hydrogen-evolving reaction activity may prevent iron hydride formation from poisoning the P3(B)<span class="hlt">Fe</span> system. This idea may be important to consider in the design of synthetic nitrogenases and may also have broader significance given that intermediate metal hydrides and hydrogen evolution may play a key role in biological nitrogen fixation.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018PhSS...60..382K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018PhSS...60..382K"><span>Mössbauer Studies of Core-Shell <span class="hlt">FeO/Fe</span>3O4 Nanoparticles</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kamzin, A. S.; Valiullin, A. A.; Khurshid, H.; Nemati, Z.; Srikanth, H.; Phan, M. H.</p> <p>2018-02-01</p> <p><span class="hlt">FeO/Fe</span>3O4 nanoparticles were synthesized by thermal decomposition. Electron microscopy revealed that these nanoparticles were of the core-shell type and had a spherical shape with an average size of 20 nm. It was found that the obtained <span class="hlt">FeO/Fe</span>3O4 nanoparticles had exchange coupling. The effect of anisotropy on the efficiency of heating (hyperthermic effect) of <span class="hlt">FeO/Fe</span>3O4 nanoparticles by an external alternating magnetic field was examined. The specific absorption rate (SAR) of the studied nanoparticles was 135 W/g in the experiment with an external alternating magnetic field with a strength of 600 Oe and a frequency of 310 kHz. These data led to an important insight: the saturation magnetization is not the only factor governing the SAR, and the efficiency of heating of magnetic <span class="hlt">FeO/Fe</span>3O4 nanoparticles may be increased by enhancing the effective anisotropy. Mössbauer spectroscopy of the phase composition of the synthesized nanoparticles clearly revealed the simultaneous presence of three phases: magnetite <span class="hlt">Fe</span>3O4, maghemite γ-<span class="hlt">Fe</span>2O3, and wustite <span class="hlt">Fe</span>O.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://pubs.er.usgs.gov/publication/70021137','USGSPUBS'); return false;" href="https://pubs.er.usgs.gov/publication/70021137"><span>Field and laboratory evidence for intrinsic biodegradation of vinyl chloride contamination in a <span class="hlt">Fe</span>(III)-reducing aquifer</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Bradley, P.M.; Chapelle, F.H.; Wilson, J.T.</p> <p>1998-01-01</p> <p>Intrinsic bioremediation of chlorinated ethenes in anaerobic aquifers previously has not been considered feasible, due, in large <span class="hlt">part</span>, to 1) the production of vinyl chloride during microbial reductive dechlorination of higher chlorinated contaminants and 2) the apparent poor biodegradability of vinyl chloride under anaerobic conditions. In this study, a combination of field geochemical analyses and laboratory radiotracer ([1,2-14C] vinyl chloride) experiments was utilized to assess the potential for intrinsic biodegradation of vinyl chloride contamination in an <span class="hlt">Fe</span>(III)-reducing, anaerobic aquifer. Microcosm experiments conducted under <span class="hlt">Fe</span>(III)-reducing conditions with material from the <span class="hlt">Fe</span>(III)-reducing, chlorinated-ethene contaminated aquifer demonstrated significant oxidation of [1,2-14C] vinyl chloride to 14CO2 with no detectable production of ethene or other reductive dehalogenation products. Rates of degradation derived from the microcosm experiments (0.9-1.3% d-1) were consistent with field-estimated rates (0.03-0.2% d-1) of apparent vinyl chloride degradation. Field estimates of apparent vinyl chloride biodegradation were calculated using two distinct approaches; 1) a solute dispersion <span class="hlt">model</span> and 2) a mass balance assessment. These findings demonstrate that degradation under <span class="hlt">Fe</span>(III) reducing conditions can be an environmentally significant mechanism for intrinsic bioremediation of vinyl chloride in anaerobic ground-water systems.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015NIMPB.352...36H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015NIMPB.352...36H"><span>Cascades in <span class="hlt">model</span> steels: The effect of cementite (<span class="hlt">Fe</span>3C) and Cr23C6 particles on short-term crystal damage</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Henriksson, K. O. E.</p> <p>2015-06-01</p> <p>Ferritic stainless steel can be <span class="hlt">modeled</span> as an iron matrix containing precipitates of cementite (<span class="hlt">Fe</span>3C) and Cr23C6. When used in nuclear power production the steels in the vicinity of the core start to accumulate damage due to neutrons. The role of the afore-mentioned carbides in this process is not well understood. In order to clarify the situation bulk cascades created by primary recoils in <span class="hlt">model</span> steels have been carried out in the present work. Investigated configurations consisted of bulk ferrite containing spherical particles (diameter of 4 nm) of either (1) <span class="hlt">Fe</span>3C or (2) Cr23C6. Primary recoils were initiated at different distances from the inclusions, with recoil energies varying between 100 eV and 1 keV. Results for the number of point defects such as vacancies and antisites are presented. These findings indicate that defects are also remaining when cascades are started outside the carbide inclusions. The work uses a recently developed Abell-Brenner-Tersoff potential for the <span class="hlt">Fe</span>-Cr-C system.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015AIPC.1678c0014Y','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015AIPC.1678c0014Y"><span>Structure prediction of <span class="hlt">Fe</span>(II) 2-oxoglutarate dioxygenase from a psychrophilic yeast Glaciozyma antarctica PI12</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Yusof, Nik Yusnoraini; Bakar, Farah Diba Abu; Mahadi, Nor Muhammad; Raih, Mohd Firdaus; Murad, Abdul Munir Abdul</p> <p>2015-09-01</p> <p>A cDNA encoding <span class="hlt">Fe</span>(II) 2-oxoglutarate (2OG) dependent dioxygenases was isolated from psychrophilic yeast, Glaciozyma antarctica PI12. We have successfully amplified 1,029 bp cDNA sequence that encodes 342 amino acid with predicted molecular weight 38 kDa. The prediction protein was analysed using various bioinformatics tools to explore the properties of the protein. Based on a BLAST search analysis, the <span class="hlt">Fe</span>2OX amino acid sequence showed 61% identity to the sequence of oxoglutarate/iron-dependent oxygenase from Rhodosporidium toruloides NP11. SignalP prediction showed that the <span class="hlt">Fe</span>2OX protein contains no putative signal peptide, which suggests that this enzyme most probably localised intracellularly.The structure of <span class="hlt">Fe</span>2OX was predicted by homology <span class="hlt">modelling</span> using <span class="hlt">MODELLER</span>9v11. The <span class="hlt">model</span> with the lowest objective function was selected from hundred <span class="hlt">models</span> generated using <span class="hlt">MODELLER</span>9v11. Analysis of the structure revealed the longer loop at <span class="hlt">Fe</span>2OX from G.antarctica that might be responsible for the flexibility of the structure, which contributes to its adaptation to low temperatures. <span class="hlt">Fe</span>2OX hold a highly conserved <span class="hlt">Fe</span>(II) binding HXD/E…H triad motif. The binding site for 2-oxoglutarate was found conserved for Arg280 among reported studies, however the Phe268 was found to be different in <span class="hlt">Fe</span>2OX.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26496524','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26496524"><span>Does a Heavy <span class="hlt">Fe</span>-Isotope Composition of Akilia Quartz-Amphibole-Pyroxene Rocks Necessitate a BIF Origin?</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Whitehouse, M J; Schoenberg, R; Fedo, C M; Kamber, B S</p> <p>2015-10-01</p> <p>The age and origin of the quartz-amphibole-pyroxene (qap) gneiss from the island of Akilia, southern West Greenland, have been the subject of intense debate since the light C-isotope composition of graphite inclusions in apatite was interpreted to indicate the presence of Earth's earliest biological activity. Although this claim for biogenic relicts has been vigorously challenged, the possibility that the rocks might represent some of Earth's earliest water-lain sediments and, hence, a suitable repository for life remains an open question. While some workers have suggested that the entire sequence represents an originally mafic-ultramafic igneous precursor subsequently modified by metasomatism, quartz injection, high-grade metamorphism, and extreme ductile deformation, others maintain that at least a small <span class="hlt">part</span> of the sequence retains geochemical characteristics indicative of a chemical sedimentary origin. Fractionated <span class="hlt">Fe</span> isotopes with δ(56)<span class="hlt">Fe</span> values similar to those observed in Isua BIF have been reported from high-SiO2 units of qap and used to support a chemical sedimentary protolith for the qap unit. Here, we present new <span class="hlt">Fe</span> isotope data from all lithologic variants in the qap gneiss on Akilia, including layers of undisputed ultramafic igneous origin. Since the latter require introduction of fractionated <span class="hlt">Fe</span> into at least <span class="hlt">part</span> of the qap unit, we argue that <span class="hlt">Fe</span> isotopes must therefore be treated with considerable caution when used to infer BIF for <span class="hlt">part</span> or all of the qap protolith.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20130011259','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20130011259"><span>Asteroidal Space Weathering: The Major Role of <span class="hlt">Fe</span>S</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Keller, L. P.; Rahman, Z.; Hiroi, T.; Sasaki, S.; Noble, S. K.; Horz, F.; Cintala, M. J.</p> <p>2013-01-01</p> <p>Space weathering (SW) effects on the lunar surface are reasonably well-understood from sample analyses, remote-sensing data, and experiments, yet our knowledge of asteroidal SW effects are far less constrained. While the same SW processes are operating on asteroids and the Moon, namely solar wind irradiation, impact vaporization and condensation, and impact melting, their relative rates and efficiencies are poorly known, as are their effects on such vastly different parent materials. Asteroidal SW <span class="hlt">models</span> based on remote-sensing data and experiments are in wide disagreement over the dominant mechanisms involved and their kinetics. Lunar space weathering effects observed in UVVIS-NIR spectra result from surface- and volume-correlated nanophase <span class="hlt">Fe</span> metal (np<span class="hlt">Fe</span>(sup 0)) particles. In the lunar case, it is the tiny vapor-deposited np<span class="hlt">Fe</span>(sup 0) that provides much of the spectral reddening, while the coarser (largely melt-derived) np<span class="hlt">Fe</span>(sup 0) produce lowered albedos. Nanophase <span class="hlt">Fe</span>S (np<span class="hlt">Fe</span>S) particles are expected to modify reflectance spectra in much the same way as np<span class="hlt">Fe</span>(sup 0) particles. Here we report the results of experiments designed to explore the efficiency of np<span class="hlt">Fe</span>S production via the main space weathering processes operating in the asteroid belt.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26290179','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26290179"><span>Biocompatibility and intradiscal application of a thermoreversible celecoxib-loaded poly-N-isopropylacrylamide Mg<span class="hlt">Fe</span>-layered double hydroxide hydrogel in a canine <span class="hlt">model</span>.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Willems, Nicole; Yang, Hsiao-Yin; Langelaan, Marloes L P; Tellegen, Anna R; Grinwis, Guy C M; Kranenburg, Hendrik-Jan C; Riemers, Frank M; Plomp, Saskia G M; Craenmehr, Eric G M; Dhert, Wouter J A; Papen-Botterhuis, Nicole E; Meij, Björn P; Creemers, Laura B; Tryfonidou, Marianna A</p> <p>2015-08-20</p> <p>Chronic low back pain due to intervertebral disc (IVD) degeneration is associated with increased levels of inflammatory mediators. Current medical treatment consists of oral anti-inflammatory drugs to alleviate pain. In this study, the efficacy and safety of a novel thermoreversible poly-N-isopropylacrylamide Mg<span class="hlt">Fe</span>-layered double hydroxide (pNIPAAM Mg<span class="hlt">Fe</span>-LDH) hydrogel was evaluated for intradiscal controlled delivery of the selective cyclooxygenase (COX) 2 inhibitor and anti-inflammatory drug celecoxib (CXB). Degradation, release behavior, and the ability of a CXB-loaded pNIPAAM Mg<span class="hlt">Fe</span>-LDH hydrogel to suppress prostaglandin E2 (PGE2) levels in a controlled manner in the presence of a proinflammatory stimulus (TNF-α) were evaluated in vitro. Biocompatibility was evaluated histologically after subcutaneous injection in mice. Safety of intradiscal application of the loaded and unloaded hydrogels was studied in a canine <span class="hlt">model</span> of spontaneous mild IVD degeneration by histological, biomolecular, and biochemical evaluation. After the hydrogel was shown to be biocompatible and safe, an in vivo dose-response study was performed in order to determine safety and efficacy of the pNIPAAM Mg<span class="hlt">Fe</span>-LDH hydrogel for intradiscal controlled delivery of CXB. CXB release correlated to hydrogel degradation in vitro. Furthermore, controlled release from CXB-loaded hydrogels was demonstrated to suppress PGE2 levels in the presence of TNF-α. The hydrogel was shown to exhibit a good biocompatibility upon subcutaneous injection in mice. Upon intradiscal injection in a canine <span class="hlt">model</span>, the hydrogel exhibited excellent biocompatibility based on histological evaluation of the treated IVDs. Gene expression and biochemical analyses supported the finding that no substantial negative effects of the hydrogel were observed. Safety of application was further confirmed by the absence of clinical symptoms, IVD herniation or progression of degeneration. Controlled release of CXB resulted in a nonsignificant</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018JPhCS.985a2044K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018JPhCS.985a2044K"><span>Effect of <span class="hlt">Fe</span>-Mn addition on microstructure and magnetic properties of Nd<span class="hlt">Fe</span>B magnetic powders</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kurniawan, C.; Purba, A. S.; Setiadi, E. A.; Simbolon, S.; Warman, A.; Sebayang, P.</p> <p>2018-03-01</p> <p>In this paper, the effect of <span class="hlt">Fe</span>-Mn alloy addition on microstructures and magnetic properties of Nd<span class="hlt">Fe</span>B magnetic powders was investigated. Varied <span class="hlt">Fe</span>-Mn compositions of 1, 5, and 10 wt% were mixed with commercial Nd<span class="hlt">Fe</span>B type MQA powders for 15 minutes using shaker mill. The characterizations were performed by powder density, PSA, XRD, SEM, and VSM. The <span class="hlt">Fe</span>-Mn addition increased the powder density of Nd<span class="hlt">FeB/Fe</span>-Mn powders. On the other side, particle size distribution slightly decreased as the <span class="hlt">Fe</span>-Mn composition increases. Magnetic properties of Nd<span class="hlt">FeB/Fe</span>-Mn powders changed with the increasing of <span class="hlt">Fe</span>-Mn content. SEM analysis showed the particle size of Nd<span class="hlt">FeB/Fe</span>-Mn powder was smaller as the <span class="hlt">Fe</span>-Mn composition increases. It showed that Nd<span class="hlt">FeB/Fe</span>-Mn particles have different size and shape for Nd<span class="hlt">Fe</span>B and <span class="hlt">Fe</span>-Mn particles separately. The optimum magnetic properties of Nd<span class="hlt">FeB/Fe</span>-Mn powder was achieved on the 5 wt% <span class="hlt">Fe</span>-Mn composition with remanence M r = 49.45 emu/g, coercivity H c = 2.201 kOe, and energy product, BH max = 2.15 MGOe.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2007AIPC..884..468E','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2007AIPC..884..468E"><span>In vivo evaluation of <span class="hlt">Fe</span> in human skin employing X-Ray Fluorescence Methodology (XRF)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Estevam, M.; Appoloni, C. R.</p> <p>2007-02-01</p> <p>Recent technological improvements allow the method of in vivo XRF to provide useful sensibility for diagnostics or monitoring in biomedical applications. In cases of hereditary sanguine disorders as the β-thalassaemia or a genetic disorder like Haemochromatosis, there is a high concentration of elements as <span class="hlt">Fe</span>, Zn and Cu in the skin and internal organs, due to the treatment of those abnormalities or due to the own dysfunction caused by the disease. The levels of <span class="hlt">Fe</span> related to the patient bearers of the β-thalassaemia are determined, at the moment, measuring a protein in the sanguine current, called ferritin. The monitoring of the protein is ineffective in several situations, such as when the patient suffers any disturbance of health. Nowadays, the main forms of measuring the levels of those metals through hepatic storage are the biopsy of the liver, that is invasive and potentially dangerous, presenting a rate of mortality of 0.1%, and by means of magnetic susceptibilities that employs a quantum superconductor, which is highly expensive and there are only three main world centers with this equipment This work investigates the use of a Si PIN-diode detector and a 238Pu source (13 and 17keV; 13%; 95.2mCi; 86y) for the measurement of <span class="hlt">Fe</span> skin levels compatible with those associated to the disease β-thalassaemia. XRF spectra were analyzed using a set of AXIL-WinQXAS programs elaborated and disseminated by the IAEA. The determination coefficient of the calibration <span class="hlt">model</span> (sensitivity curve) was 0.97. Measurements on skin phantoms containing concentrations of <span class="hlt">Fe</span> in the range from 10 to 150 <span class="hlt">parts</span> per million (ppm), indicate that we are able to detect <span class="hlt">Fe</span> at levels of the order of 15ppm, using monitoring periods of 50 seconds and skin entrance dose less than 10 mSv, The literature reports skin <span class="hlt">Fe</span> levels from 15.0 to 60.0 ppm in normal persons and from 70 to 150 ppm in thalassaemics patients. So, the employed methodology allows the measurement of the skin <span class="hlt">Fe</span> concentration.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012JMEP...21...25O','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012JMEP...21...25O"><span><span class="hlt">Modeling</span> and Analysis of Process Parameters for Evaluating Shrinkage Problems During Plastic Injection Molding of a DVD-ROM Cover</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Öktem, H.</p> <p>2012-01-01</p> <p>Plastic injection molding plays a key role in the production of high-quality plastic <span class="hlt">parts</span>. Shrinkage is one of the most significant problems of a plastic <span class="hlt">part</span> in terms of quality in the plastic injection molding. This article focuses on the study of the <span class="hlt">modeling</span> and analysis of the effects of process parameters on the shrinkage by evaluating the quality of the plastic <span class="hlt">part</span> of a DVD-ROM cover made with Acrylonitrile Butadiene Styrene (ABS) polymer material. An effective regression <span class="hlt">model</span> was developed to determine the mathematical relationship between the process parameters (mold temperature, melt temperature, injection pressure, injection time, and cooling time) and the volumetric shrinkage by utilizing the analysis data. Finite element (<span class="hlt">FE</span>) analyses designed by Taguchi (L27) orthogonal arrays were run in the Moldflow simulation program. Analysis of variance (ANOVA) was then performed to check the adequacy of the regression <span class="hlt">model</span> and to determine the effect of the process parameters on the shrinkage. Experiments were conducted to control the accuracy of the regression <span class="hlt">model</span> with the <span class="hlt">FE</span> analyses obtained from Moldflow. The results show that the regression <span class="hlt">model</span> agrees very well with the <span class="hlt">FE</span> analyses and the experiments. From this, it can be concluded that this study succeeded in <span class="hlt">modeling</span> the shrinkage problem in our application.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/24579799','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/24579799"><span>Effects of metal ions on the reactivity and corrosion electrochemistry of <span class="hlt">Fe/Fe</span>S nanoparticles.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Kim, Eun-Ju; Kim, Jae-Hwan; Chang, Yoon-Seok; Turcio-Ortega, David; Tratnyek, Paul G</p> <p>2014-04-01</p> <p>Nano-zerovalent iron (nZVI) formed under sulfidic conditions results in a biphasic material (<span class="hlt">Fe/Fe</span>S) that reduces trichloroethene (TCE) more rapidly than nZVI associated only with iron oxides (<span class="hlt">Fe/Fe</span>O). Exposing <span class="hlt">Fe/Fe</span>S to dissolved metals (Pd(2+), Cu(2+), Ni(2+), Co(2+), and Mn(2+)) results in their sequestration by coprecipitation as dopants into <span class="hlt">Fe</span>S and <span class="hlt">Fe</span>O and/or by electroless precipitation as zerovalent metals that are hydrogenation catalysts. Using TCE reduction rates to probe the effect of metal amendments on the reactivity of <span class="hlt">Fe/Fe</span>S, it was found that Mn(2+) and Cu(2+) decreased TCE reduction rates, while Pd(2+), Co(2+), and Ni(2+) increased them. Electrochemical characterization of metal-amended <span class="hlt">Fe/Fe</span>S showed that aging caused passivation by growth of <span class="hlt">Fe</span>O and <span class="hlt">Fe</span>S phases and poisoning of catalytic metal deposits by sulfide. Correlation of rate constants for TCE reduction (kobs) with electrochemical parameters (corrosion potentials and currents, Tafel slopes, and polarization resistance) and descriptors of hydrogen activation by metals (exchange current density for hydrogen reduction and enthalpy of solution into metals) showed the controlling process changed with aging. For fresh <span class="hlt">Fe/Fe</span>S, kobs was best described by the exchange current density for activation of hydrogen, whereas kobs for aged <span class="hlt">Fe/Fe</span>S correlated with electrochemical descriptors of electron transfer.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_20");'>20</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li class="active"><span>22</span></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_22 --> <div id="page_23" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li class="active"><span>23</span></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="441"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/25010729','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/25010729"><span>Size-induced chemical and magnetic ordering in individual <span class="hlt">Fe</span>-Au nanoparticles.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Mukherjee, Pinaki; Manchanda, Priyanka; Kumar, Pankaj; Zhou, Lin; Kramer, Matthew J; Kashyap, Arti; Skomski, Ralph; Sellmyer, David; Shield, Jeffrey E</p> <p>2014-08-26</p> <p>Formation of chemically ordered compounds of <span class="hlt">Fe</span> and Au is inhibited in bulk materials due to their limited mutual solubility. However, here we report the formation of chemically ordered L12-type <span class="hlt">Fe</span>3Au and <span class="hlt">Fe</span>Au3 compounds in <span class="hlt">Fe</span>-Au sub-10 nm nanoparticles, suggesting that they are equilibrium structures in size-constrained systems. The stability of these L12-ordered <span class="hlt">Fe</span>3Au and <span class="hlt">Fe</span>Au3 compounds along with a previously discovered L10-ordered <span class="hlt">Fe</span>Au has been explained by a size-dependent equilibrium thermodynamic <span class="hlt">model</span>. Furthermore, the spin ordering of these three compounds has been computed using ab initio first-principle calculations. All ordered compounds exhibit a substantial magnetization at room temperature. The <span class="hlt">Fe</span>3Au had a high saturation magnetization of about 143.6 emu/g with a ferromagnetic spin structure. The <span class="hlt">Fe</span>Au3 nanoparticles displayed a low saturation magnetization of about 11 emu/g. This suggests a antiferromagnetic spin structure, with the net magnetization arising from uncompensated surface spins. First-principle calculations using the Vienna ab initio simulation package (VASP) indicate that ferromagnetic ordering is energetically most stable in <span class="hlt">Fe</span>3Au, while antiferromagnetic order is predicted in <span class="hlt">Fe</span>Au and <span class="hlt">Fe</span>Au3, consistent with the experimental results.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/22283125-tuning-exchange-bias-fe-fe-sub-sub-core-shell-nanoparticles-impacts-interface-surface-spins','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/22283125-tuning-exchange-bias-fe-fe-sub-sub-core-shell-nanoparticles-impacts-interface-surface-spins"><span>Tuning exchange bias in <span class="hlt">Fe/γ-Fe</span>{sub 2}O{sub 3} core-shell nanoparticles: Impacts of interface and surface spins</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Khurshid, Hafsa, E-mail: hkhurshi@usf.edu, E-mail: phanm@usf.edu, E-mail: sharihar@usf.edu; Phan, Manh-Huong, E-mail: hkhurshi@usf.edu, E-mail: phanm@usf.edu, E-mail: sharihar@usf.edu; Mukherjee, Pritish</p> <p></p> <p>A comparative study has been performed of the exchange bias (EB) effect in <span class="hlt">Fe/γ-Fe</span>{sub 2}O{sub 3} core-shell nanoparticles with the same thickness of the γ-<span class="hlt">Fe</span>{sub 2}O{sub 3} shell (∼2 nm) and the diameter of the <span class="hlt">Fe</span> core varying from 4 nm to 11 nm. Transmission electron microscopy (TEM) and high-resolution TEM confirmed the high quality of the core-shell nanostructures. A systematic analysis of magnetization versus magnetic field measurements under zero-field-cooled and field-cooled regimes using the Meiklejohn-Bean <span class="hlt">model</span> and deconvoluting superparamagnetic and paramagnetic contribution to the total magnetic moment Langevin function shows that there exists a critical particle size (∼10 nm), above which the spinsmore » at the interface between <span class="hlt">Fe</span> and γ-<span class="hlt">Fe</span>{sub 2}O{sub 3} contribute primarily to the EB, but below which the surface spin effect is dominant. Our finding yields deeper insight into the collective contributions of interface and surface spins to the EB in core-shell nanoparticle systems, knowledge of which is the key to manipulating EB in magnetic nanostructures for spintronics applications.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015LTP....41..990G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015LTP....41..990G"><span>Features of the electronic structure of <span class="hlt">Fe</span>Te compounds</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Grechnev, G. E.; Lyogenkaya, A. A.; Panfilov, A. S.; Logosha, A. V.; Kotlyar, O. V.; Gnezdilov, V. P.; Makarova, I. P.; Chareev, D. A.; Mitrofanova, E. S.</p> <p>2015-12-01</p> <p>A theoretical and experimental study of the electronic structure and nature of the chemical bonds in <span class="hlt">Fe</span>Te compounds in antiferromagnetic (AFM) and paramagnetic phases was carried out. It is established that the nature of the chemical bonds is mainly metallic, and the presence of covalent bonds <span class="hlt">Fe</span>-Te and Te-Te helps to stabilize the structural distortions of the tetragonal phase of <span class="hlt">Fe</span>Te in the low-temperature region. It is found that the bicollinear AFM structure corresponds to the ground state of the <span class="hlt">Fe</span>Te compound and the calculated value of the magnetic moment MFe = -2.4μB is in good agreement with the data from neutron diffraction measurements. At the same time, the Fermi surface (FS) of the low-temperature AFM phase is radically different from the FS of the paramagnetic <span class="hlt">Fe</span>Te. Reconstructing the FS can lead to a sign change of the Hall coefficient observed in <span class="hlt">Fe</span>Te. The calculation results serve as evidence of the fact that the electronic structures and magnetic properties of <span class="hlt">Fe</span>Te are well-described by the <span class="hlt">model</span> of itinerant d-electrons and the density functional theory (DFT-GGA).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5849021','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5849021"><span><span class="hlt">Fe</span>3O4 Nanoparticles in Targeted Drug/Gene Delivery Systems</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Shen, Lazhen; Li, Bei; Qiao, Yongsheng</p> <p>2018-01-01</p> <p><span class="hlt">Fe</span>3O4 nanoparticles (NPs), the most traditional magnetic nanoparticles, have received a great deal of attention in the biomedical field, especially for targeted drug/gene delivery systems, due to their outstanding magnetism, biocompatibility, lower toxicity, biodegradability, and other features. Naked <span class="hlt">Fe</span>3O4 NPs are easy to aggregate and oxidize, and thus are often made with various coatings to realize superior properties for targeted drug/gene delivery. In this review, we first list the three commonly utilized synthesis methods of <span class="hlt">Fe</span>3O4 NPs, and their advantages and disadvantages. In the second <span class="hlt">part</span>, we describe coating materials that exhibit noticeable features that allow functionalization of <span class="hlt">Fe</span>3O4 NPs and summarize their methods of drug targeting/gene delivery. Then our efforts will be devoted to the research status and progress of several different functionalized <span class="hlt">Fe</span>3O4 NP delivery systems loaded with chemotherapeutic agents, and we present targeted gene transitive carriers in detail. In the following section, we illuminate the most effective treatment systems of the combined drug and gene therapy. Finally, we propose opportunities and challenges of the clinical transformation of <span class="hlt">Fe</span>3O4 NPs targeting drug/gene delivery systems. PMID:29473914</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/28783498','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/28783498"><span>A <span class="hlt">Fe</span>(II)/citrate/UV/PMS process for carbamazepine degradation at a very low <span class="hlt">Fe</span>(II)/PMS ratio and neutral pH: The mechanisms.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Ling, Li; Zhang, Dapeng; Fan, Chihhao; Shang, Chii</p> <p>2017-11-01</p> <p>A novel <span class="hlt">Fe</span>(II)/citrate/UV/PMS process for degrading a <span class="hlt">model</span> micropollutant, carbamazepine (CBZ), at a low <span class="hlt">Fe</span>(II)/PMS ratio and neutral pH has been proposed in this study, and the mechanisms of radical generation in the system was explored. With a UV dose of 302.4 mJ/cm 2 , an initial pH of 7, and CBZ, PMS, <span class="hlt">Fe</span>(II) and citrate at initial concentrations of 10, 100, 12 and 26 μM, respectively, the CBZ degradation efficiency reached 71% in 20 min in the <span class="hlt">Fe</span>(II)/citrate/UV/PMS process, which was 4.7 times higher than that in either the citrate/UV/PMS or <span class="hlt">Fe</span>(II)/citrate/PMS process. The enhanced CBZ degradation in the <span class="hlt">Fe</span>(II)/citrate/UV/PMS process was mainly attributed to the continuous activation of PMS by the UV-catalyzed regenerated <span class="hlt">Fe</span>(II) from a <span class="hlt">Fe</span>(III)-citrate complex, [<span class="hlt">Fe</span> 3 O(cit) 3 H 3 ] 2- , which not only maintained <span class="hlt">Fe</span>(III) soluble at neutral pH, but also increased 6.6 and 2.6 times of its molar absorbance and quantum yield as compared to those of ionic <span class="hlt">Fe</span>(III), respectively. In the <span class="hlt">Fe</span>(II)/citrate/UV/PMS process, the SO 4 •- produced from the fast reaction between PMS and the initially-added <span class="hlt">Fe</span>(II) contributed 11% of CBZ degradation. The PMS activation by the UV radiation and regenerated <span class="hlt">Fe</span>(II) contributed additional 14% and 46% of CBZ removal, respectively. The low iron and citrate doses and the fast radical generation at neutral pH make the <span class="hlt">Fe</span>(II)/citrate/UV/PMS process suitable for degrading recalcitrant organic compounds in potable water. Copyright © 2017 Elsevier Ltd. All rights reserved.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1995Metic..30..538M','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1995Metic..30..538M"><span>Phase Decomposition in the <span class="hlt">Fe</span>-rich <span class="hlt">Fe</span>-Ni-S System from 900 Degrees C to 300 Degrees C--Application to Meteoritic Metal</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Ma, L.; Williams, D. B.; Goldstein, J. I.</p> <p>1995-09-01</p> <p>It has been observed that metal particles in ordinary chondrites contain essentially no P and that the tetrataenite rim of the metal particles is much wider than that in other types of meteorites, especially when the taenite rim abuts troilites (<span class="hlt">Fe</span>S) [1]. It is possible that S plays an important role in the formation of the zoned tetrataenite at low cooling temperatures. Most of the studies of the <span class="hlt">Fe</span>-Ni-S system have concentrated on high temperature and high Ni-high S <span class="hlt">part</span> of the ternary diagram [2][3]. In this study we have systematically investigated the microstructure and microchemistry of the <span class="hlt">Fe</span>-rich <span class="hlt">Fe</span>-Ni-S system in regions where meteoritic metal forms from 900 degrees C down to 300 degrees C. High spatial resolution electron probe microanalysis (EPMA) and analytical electron microscopy (AEM) techniques were employed. The two and three phase boundaries at high temperatures (900 degrees C to 600 degrees C) are consistent with previous studies. However, at 500 degrees C, an <span class="hlt">Fe</span>-Ni phase with 51.6 +/- 1.4 wt.% Ni was observed to form along some of the g/g and g/<span class="hlt">Fe</span>S boundaries. The size of this <span class="hlt">Fe</span>-Ni phase is as large as 10 micrometers in width. AEM analysis indicates that this <span class="hlt">Fe</span>-Ni phase may have even higher Ni content, 56 wt.%. In addition, the phase has a FCC structure and is disordered. Because the composition of this phase is very close to the stoichiometric composition of <span class="hlt">Fe</span>Ni, it is very likely that the phase is tetrataenite. High Ni precipitates with similar morphology were also observed in the <span class="hlt">Fe</span>-Ni-S alloy aged at 400 degrees C. However, the Ni content is 60.9 +/- 4.0 wt.% measured with EPMA, which is much higher than that in the corresponding 500 degree C sample. The fact that all the high Ni precipitates formed at boundaries of g/g or g/<span class="hlt">Fe</span>S indicates the boundaries are favorable energy nucleation sites. Such a high Ni phase with a Ni content over 60 wt.% has not been observed in the <span class="hlt">Fe</span>-Ni and <span class="hlt">Fe</span>-Ni (P) systems above 400 degrees C. The tetrataenite</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/servlets/purl/1389929','SCIGOV-STC'); return false;" href="https://www.osti.gov/servlets/purl/1389929"><span>Overview of lower length scale <span class="hlt">model</span> development for accident tolerant fuels regarding U3Si2 fuel and <span class="hlt">Fe</span>CrAl cladding</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Zhang, Yongfeng</p> <p>2016-09-01</p> <p>U3Si2 and <span class="hlt">Fe</span>CrAl have been proposed as fuel and cladding concepts, respectively, for accident tolerance fuels with higher tolerance to accident scenarios compared to UO2. However, a lot of key physics and material properties regarding their in-pile performance are yet to be explored. To accelerate the understanding and reduce the cost of experimental studies, multiscale <span class="hlt">modeling</span> and simulation are used to develop physics-based materials <span class="hlt">models</span> to assist engineering scale fuel performance <span class="hlt">modeling</span>. In this report, the lower-length-scale efforts in method and material <span class="hlt">model</span> development supported by the Accident Tolerance Fuel (ATF) high-impact-problem (HIP) under the NEAMS program are summarized. Significantmore » progresses have been made regarding interatomic potential, phase field <span class="hlt">models</span> for phase decomposition and gas bubble formation, and thermal conductivity for U3Si2 fuel, and precipitation in <span class="hlt">Fe</span>CrAl cladding. The accomplishments are very useful by providing atomistic and mesoscale tools, improving the current understanding, and delivering engineering scale <span class="hlt">models</span> for these two ATF concepts.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/biblio/1050106-optimized-expression-purification-high-activity-preparations-algal-fefe-hydrogenase','SCIGOV-STC'); return false;" href="https://www.osti.gov/biblio/1050106-optimized-expression-purification-high-activity-preparations-algal-fefe-hydrogenase"><span>Optimized Expression and Purification for High-Activity Preparations of Algal [<span class="hlt">FeFe</span>]-Hydrogenase</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Yacoby, I.; Tegler, L. T.; Pochekailov, S.</p> <p>2012-04-01</p> <p>Recombinant expression and purification of metallo-enzymes, including hydrogenases, at high-yields is challenging due to complex, and enzyme specific, post-translational maturation processes. Low fidelities of maturation result in preparations containing a significant fraction of inactive, apo-protein that are not suitable for biophysical or crystallographic studies. We describe the construction, overexpression and high-yield purification of a fusion protein consisting of the algal [2<span class="hlt">Fe</span>2S]-ferredoxin PetF (Fd) and [<span class="hlt">FeFe</span>]-hydrogenase HydA1. The maturation of Fd-HydA1 was optimized through improvements in culture conditions and media components used for expression. We also demonstrated that fusion of Fd to the N-terminus of HydA1, in comparison to the C-terminus,more » led to increased expression levels that were 4-fold higher. Together, these improvements led to enhanced HydA1 activity and improved yield after purification. The strong binding-affinity of Fd for DEAE allowed for two-step purification by ion exchange and StrepTactin affinity chromatography. In addition, the incorporation of a TEV protease site in the Fd-HydA1 linker allowed for the proteolytic removal of Fd after DEAE step, and purification of HydA1 alone by StrepTactin. In combination, this process resulted in HydA1 purification yields of 5 mg L{sup -1} of culture from E. coli with specific activities of 1000 U (U = 1 {micro}mol hydrogen evolved mg{sup -1} min{sup -1}). The [<span class="hlt">FeFe</span>]-hydrogenases are highly efficient enzymes and their catalytic sites provide <span class="hlt">model</span> structures for synthetic efforts to develop robust hydrogen activation catalysts. In order to characterize their structure-function properties in greater detail, and to use hydrogenases for biotechnological applications, reliable methods for rapid, high-yield expression and purification are required.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/29306155','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/29306155"><span>Interaction mechanisms between α-<span class="hlt">Fe</span>2O3, γ-<span class="hlt">Fe</span>2O3 and <span class="hlt">Fe</span>3O4 nanoparticles and Citrus maxima seedlings.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Li, Junli; Hu, Jing; Xiao, Lian; Wang, Yunqiang; Wang, Xilong</p> <p>2018-06-01</p> <p>The interactions between α-<span class="hlt">Fe</span> 2 O 3 , γ-<span class="hlt">Fe</span> 2 O 3 , and <span class="hlt">Fe</span> 3 O 4 nanoparticles (NPs) and Citrus maxima seedlings were examined so as to better understand possible particle applications as an <span class="hlt">Fe</span> source for crop plants. NPs toxicity to the exposed plant was investigated as well. The α- and γ-<span class="hlt">Fe</span> 2 O 3 NPs were accumulated by plant root cells through diapirism and endocytosis, respectively, but translocation to the shoots was negligible. Analysis of malondialdehyde (MDA), soluble protein content, and antioxidant enzyme activity revealed that <span class="hlt">Fe</span> deficiency induced strong oxidative stress in Citrus maxima seedlings, which followed an order of <span class="hlt">Fe</span> deficiency><span class="hlt">Fe</span> 3+ >α-<span class="hlt">Fe</span> 2 O 3 , γ-<span class="hlt">Fe</span> 2 O 3 NPs><span class="hlt">Fe</span> 3 O 4 NPs. However, the chlorophyll leaf content of plants exposed to α-<span class="hlt">Fe</span> 2 O 3 , γ-<span class="hlt">Fe</span> 2 O 3 , <span class="hlt">Fe</span> 3 O 4 NPs and <span class="hlt">Fe</span> 3+ were significantly reduced by 31.1%, 14.8%, 18.8% and 22.0%, respectively, relative to the control. Furthermore, RT-PCR analysis revealed no up-regulation of AHA and Nramp3 genes in Citrus maxima roots; however, the relative FRO2 gene expression upon exposure to iron oxide NPs was 1.4-2.8-fold higher than the control. Ferric reductase activity was consistently enhanced upon iron oxide NPs exposure. These findings advance understanding of the interaction mechanisms between metal oxide NPs and plants, and provide important knowledge need for the possible application of these materials in agriculture. Copyright © 2017 Elsevier B.V. All rights reserved.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017AGUFM.V13E..04S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017AGUFM.V13E..04S"><span>Experimentally determined isotope effect during Mg-<span class="hlt">Fe</span> interdiffusion in olivine</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Sio, C. K. I.; Roskosz, M.; Dauphas, N.; Bennett, N.; Mock, T. D.; Shahar, A.</p> <p>2017-12-01</p> <p>Isotopic fractionation provides the most direct means to investigate the nature of chemical zoning in minerals, which can be produced by either diffusive transport or crystal growth. Misinterpreting the nature of chemical zoning can result in erroneous conclusions regarding magmatic cooling rates and diffusion timescales. Isotopes are useful in this regard because the light isotopes diffuse faster than their heavier counterparts. As a result, isotopic fractionations should be associated with chemical zoning profiles if they are diffusion-driven. In contrast, little isotopic fractionation is associated with crystal growth during slow cooling at magmatic temperatures. The isotope effect for diffusion is described by β and is related to the mass (m) and diffusivity (D) of isotopes i and j of an element via: Di/Dj = (mj/mi)β. To <span class="hlt">model</span> isotopic profiles, knowledge of β is required. Several estimates of β for Mg and <span class="hlt">Fe</span> diffusion in olivine have been reported using natural samples but these estimates are uncertain because they depend on the choice of <span class="hlt">modeling</span> parameters (Sio et al., 2013; Oeser et al., 2015; Collinet et al., 2017). We have experimentally determined β for <span class="hlt">Fe</span> (β<span class="hlt">Fe</span>) in olivine as a function of crystallographic orientation, composition, and temperature. Thirty experiments have been conducted by juxtaposing crystallographically oriented olivine crystals to make Fo83.4-Fo88.8 and Fo88.8-Fo100 diffusion couples. These diffusion couples were annealed in a 1 atm gas mixing furnace at 1200 °C, 1300 °C or 1400 °C at QFM - 1.5 for up to 15 days. Chemical profiles were characterized using an electron microprobe and isotopic analyses were done using laser ablation MC-ICPMS. We found a crystallographic dependence of β<span class="hlt">Fe</span> for the Fo88.8-Fo100 couple where β<span class="hlt">Fe</span> [100] ≈ β<span class="hlt">Fe</span> [010] > β<span class="hlt">Fe</span> [001]. For the Fo83.4-Fo88.8 couple, β<span class="hlt">Fe</span> is 0.16 ± 0.09 (2σ) for all 3 major crystallographic axes. A temperature dependence of β<span class="hlt">Fe</span> could not be resolved. These</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://hdl.handle.net/2060/20130014466','NASA-TRS'); return false;" href="http://hdl.handle.net/2060/20130014466"><span>Atmospheric Dissolved Iron Depostiion to the Global Oceans: Effects of Oxalate-Promoted <span class="hlt">Fe</span> Dissolution, Photochemical Redox Cycling, and Dust Mineralogy</span></a></p> <p><a target="_blank" href="http://ntrs.nasa.gov/search.jsp">NASA Technical Reports Server (NTRS)</a></p> <p>Johnson, M. S.; Meskhidze, N.</p> <p>2013-01-01</p> <p>Mineral dust deposition is suggested to be a significant atmospheric supply pathway of bioavailable iron (<span class="hlt">Fe</span>) to <span class="hlt">Fe</span>-depleted surface oceans. In this study, mineral dust and dissolved <span class="hlt">Fe</span> (Fed) deposition rates are predicted for March 2009 to February 2010 using the 3-D chemical transport <span class="hlt">model</span> GEOS-Chem implemented with a comprehensive dust-<span class="hlt">Fe</span> dissolution scheme. The <span class="hlt">model</span> simulates Fed production during the atmospheric transport of mineral dust taking into account inorganic and organic (oxalate)-promoted <span class="hlt">Fe</span> dissolution processes, photochemical redox cycling between ferric (<span class="hlt">Fe</span>(III)) and ferrous (<span class="hlt">Fe</span>(II)) forms of <span class="hlt">Fe</span>, dissolution of three different <span class="hlt">Fe</span>-containing minerals (hematite, goethite, and aluminosilicates), and detailed mineralogy of windblown dust from the major desert regions. Our calculations suggest that during the yearlong simulation is approximately 0.26 Tg (1 Tg = 1012 g) of Fed was deposited to global oceanic regions. Compared to simulations only taking into account proton-promoted <span class="hlt">Fe</span> dissolution, the addition of oxalate to the dust-<span class="hlt">Fe</span> mobilization scheme increased total annual <span class="hlt">model</span>-predicted Fed deposition to global oceanic regions by approximately 75%. The implementation of <span class="hlt">Fe(II)/Fe</span>(III) photochemical redox cycling in the <span class="hlt">model</span> allows for the distinction between different oxidation states of deposited Fed. Our calculations suggest that during the daytime, large fractions of Fed deposited to the global oceans is likely to be in <span class="hlt">Fe</span>(II) form, while nocturnal fluxes of Fed are largely in <span class="hlt">Fe</span>(III) form. <span class="hlt">Model</span> simulations also show that atmospheric fluxes of Fed can be strongly influenced by the mineralogy of <span class="hlt">Fe</span>-containing compounds. This study shows that Fed deposition to the oceans is controlled by total dust-<span class="hlt">Fe</span> mass concentrations, mineralogy, the surface area of dust particles, atmospheric chemical composition, cloud processing, and meteorological parameters and exhibits complex and spatiotemporally variable patterns. Our study suggests that the</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/22973060','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/22973060"><span><span class="hlt">Fe</span>²⁺ block and permeation of CaV3.1 (α1G) T-type calcium channels: candidate mechanism for non-transferrin-mediated <span class="hlt">Fe</span>²⁺ influx.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Lopin, Kyle V; Gray, I Patrick; Obejero-Paz, Carlos A; Thévenod, Frank; Jones, Stephen W</p> <p>2012-12-01</p> <p>Iron is a biologically essential metal, but excess iron can cause damage to the cardiovascular and nervous systems. We examined the effects of extracellular <span class="hlt">Fe</span>²⁺ on permeation and gating of Ca(V)3.1 channels stably transfected in HEK293 cells, by using whole-cell recording. Precautions were taken to maintain iron in the <span class="hlt">Fe</span>²⁺ state (e.g., use of extracellular ascorbate). With the use of instantaneous I-V currents (measured after strong depolarization) to isolate the effects on permeation, extracellular <span class="hlt">Fe</span>²⁺ rapidly blocked currents with 2 mM extracellular Ca²⁺ in a voltage-dependent manner, as described by a Woodhull <span class="hlt">model</span> with K(D) = 2.5 mM at 0 mV and apparent electrical distance δ = 0.17. Extracellular <span class="hlt">Fe</span>²⁺ also shifted activation to more-depolarized voltages (by ∼10 mV with 1.8 mM extracellular <span class="hlt">Fe</span>²⁺) somewhat more strongly than did extracellular Ca²⁺ or Mg²⁺, which is consistent with a Gouy-Chapman-Stern <span class="hlt">model</span> with surface charge density σ = 1 e(-)/98 Ų and K(<span class="hlt">Fe</span>) = 4.5 M⁻¹ for extracellular <span class="hlt">Fe</span>²⁺. In the absence of extracellular Ca²⁺ (and with extracellular Na⁺ replaced by TEA), <span class="hlt">Fe</span>²⁺ carried detectable, whole-cell, inward currents at millimolar concentrations (73 ± 7 pA at -60 mV with 10 mM extracellular <span class="hlt">Fe</span>²⁺). With a two-site/three-barrier Eyring <span class="hlt">model</span> for permeation of Ca(V)3.1 channels, we estimated a transport rate for <span class="hlt">Fe</span>²⁺ of ∼20 ions/s for each open channel at -60 mV and pH 7.2, with 1 μM extracellular <span class="hlt">Fe</span>²⁺ (with 2 mM extracellular Ca²⁺). Because Ca(V)3.1 channels exhibit a significant "window current" at that voltage (open probability, ∼1%), Ca(V)3.1 channels represent a likely pathway for <span class="hlt">Fe</span>²⁺ entry into cells with clinically relevant concentrations of extracellular <span class="hlt">Fe</span>²⁺.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/28412817','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/28412817"><span>Impact of Microcystis aeruginosa Exudate on the Formation and Reactivity of Iron Oxide Particles Following <span class="hlt">Fe</span>(II) and <span class="hlt">Fe</span>(III) Addition.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Garg, Shikha; Wang, Kai; Waite, T David</p> <p>2017-05-16</p> <p>Impact of the organic exudate secreted by a toxic strain of Microcystis aeruginosa on the formation, aggregation, and reactivity of iron oxides that are formed on addition of <span class="hlt">Fe</span>(II) and <span class="hlt">Fe</span>(III) salts to a solution of the exudate is investigated in this study. The exudate has a stabilizing effect on the particles formed with decreased aggregation rate and increased critical coagulant concentration required for diffusion-limited aggregation to occur. These results suggest that the presence of algal exudates from Microcystis aeruginosa may significantly influence particle aggregation both in natural water bodies where <span class="hlt">Fe</span>(II) oxidation results in oxide formation and in water treatment where <span class="hlt">Fe</span>(III) salts are commonly added to aid particle growth and contaminant capture. The exudate also affects the reactivity of iron oxide particles formed with exudate coated particles undergoing faster dissolution than bare iron oxide particles. This has implications to iron availability, especially where algae procure iron via dissolution of iron oxide particles as a result of either reaction with reducing moieties, light-mediated ligand to metal charge transfer and/or reaction with siderophores. The increased reactivity of exudate coated particles is attributed, for the most <span class="hlt">part</span>, to the smaller size of these particles, higher surface area and increased accessibility of surface sites.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018MinPe.112..245K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018MinPe.112..245K"><span>Raman spectroscopic features of Al- <span class="hlt">Fe</span>3+- poor magnesiochromite and <span class="hlt">Fe</span>2+- <span class="hlt">Fe</span>3+- rich ferrian chromite solid solutions</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kharbish, Sherif</p> <p>2018-04-01</p> <p>Naturally occurring Al- <span class="hlt">Fe</span>3 +- poor magnesiochromite and <span class="hlt">Fe</span>2+- <span class="hlt">Fe</span>3 +- rich ferrian chromite solid solutions have been analyzed by micro-Raman spectroscopy. The results reflect a strong positive correlation between the <span class="hlt">Fe</span>3 + # [<span class="hlt">Fe</span>3+/(<span class="hlt">Fe</span>3 ++Cr + Al)] and the positions of all Raman bands. A positive correlation of the Raman band positions with Mg# [Mg/(Mg + <span class="hlt">Fe</span>2 +)] is less stringent. Raman spectra of magnesiochromite and ferrian chromite show seven and six bands, respectively, in the spectral region of 800 - 100 cm- 1. The most intense band in both minerals is identified as symmetric stretching vibrational mode, ν 1( A 1 g ). In the intermediate Raman-shift region (400-600 cm- 1), the significant bands are attributed to the ν 3( F 2 g ) > ν 4( F 2 g ) > ν 2( E g ) modes. The bands with the lowest Raman shifts (< 200 cm- 1) are assigned to F 2 g ( trans) translatory lattice modes. Extra bands in magnesiochromite (two bands) and in ferrian chromite (one weak band) are attributed to lowering in local symmetry and order/disorder effects.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2015JNuM..467..320B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2015JNuM..467..320B"><span>From solid solution to cluster formation of <span class="hlt">Fe</span> and Cr in α-Zr</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Burr, P. A.; Wenman, M. R.; Gault, B.; Moody, M. P.; Ivermark, M.; Rushton, M. J. D.; Preuss, M.; Edwards, L.; Grimes, R. W.</p> <p>2015-12-01</p> <p>To understand the mechanisms by which the re-solution of <span class="hlt">Fe</span> and Cr additions increase the corrosion rate of irradiated Zr alloys, the solubility and clustering of <span class="hlt">Fe</span> and Cr in <span class="hlt">model</span> binary Zr alloys was investigated using a combination of experimental and <span class="hlt">modelling</span> techniques - atom probe tomography (APT), x-ray diffraction (XRD), thermoelectric power (TEP) and density functional theory (DFT). Cr occupies both interstitial and substitutional sites in the α-Zr lattice; <span class="hlt">Fe</span> favours interstitial sites, and a low-symmetry site that was not previously <span class="hlt">modelled</span> is found to be the most favourable for <span class="hlt">Fe</span>. Lattice expansion as a function of <span class="hlt">Fe</span> and Cr content in the α-Zr matrix deviates from Vegard's law and is strongly anisotropic for <span class="hlt">Fe</span> additions, expanding the c-axis while contracting the a-axis. Matrix content of solutes cannot be reliably estimated from lattice parameter measurements, instead a combination of TEP and APT was employed. Defect clusters form at higher solution concentrations, which induce a smaller lattice strain compared to the dilute defects. In the presence of a Zr vacancy, all two-atom clusters are more soluble than individual point defects and as many as four <span class="hlt">Fe</span> or three Cr atoms could be accommodated in a single Zr vacancy. The Zr vacancy is critical for the increased apparent solubility of defect clusters; the implications for irradiation induced microstructure changes in Zr alloys are discussed.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018AIPC.1953c0055R','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018AIPC.1953c0055R"><span>Effect of Zn addition on structural, magnetic properties, antistructural <span class="hlt">modeling</span> of Co1-xZnx<span class="hlt">Fe</span>2O4 nano ferrite</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Raghuvanshi, S.; Kane, S. N.; Tatarchuk, T. R.; Mazaleyrat, F.</p> <p>2018-05-01</p> <p>Effect of Zn addition on cationic distribution, structural properties, magnetic properties, antistructural <span class="hlt">modeling</span> of nanocrystalline Co1-xZnx<span class="hlt">Fe</span>2O4 (0.08 ≤ x ≤ 0.56) ferrite is reported. XRD confirms the formation of single phase cubic spinel nano ferrites with average grain diameter ranging between 41.2 - 54.9 nm. Coercivity (Hc), anisotropy constant (K1) decreases with Zn addition, but experimental, theoretical saturation magnetization (Ms, Ms(t)) increases upto x = 0.32, then decreases, attributed to the breaking of collinear ferrimagnetic phase. Variation of magnetic properties is correlated with cationic distribution. A new antistructural <span class="hlt">modeling</span> for describing active surface centers is discussed to explain change in concentration of donor's active centers Zn'B, Co'B, acceptor's active centers <span class="hlt">Fe</span>*A are explained.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011PhRvB..84r4102S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011PhRvB..84r4102S"><span>Effects of spin transition on diffusion of <span class="hlt">Fe</span>2+ in ferropericlase in Earth's lower mantle</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Saha, Saumitra; Bengtson, Amelia; Crispin, Katherine L.; van Orman, James A.; Morgan, Dane</p> <p>2011-11-01</p> <p>Knowledge of <span class="hlt">Fe</span> composition in lower-mantle minerals (primarily perovskite and ferropericlase) is essential to a complete understanding of the Earth's interior. <span class="hlt">Fe</span> cation diffusion potentially controls many aspects of the distribution of <span class="hlt">Fe</span> in the Earth's lower mantle, including mixing of chemical heterogeneities, element partitioning, and the extent of core-mantle communications. <span class="hlt">Fe</span> in ferropericlase has been shown to undergo a spin transition starting at about 40 GPa and exists in a mixture of high-spin and low-spin states over a wide range of pressures. Present experimental data on <span class="hlt">Fe</span> transport in ferropericlase is limited to pressures below 35 GPa and provides little information on the pressure dependence of the activation volume and none on the impact of the spin transition on diffusion. Therefore, known experimental data on <span class="hlt">Fe</span> diffusion cannot be reliably extrapolated to predict diffusion throughout the lower mantle. Here, first-principles and statistical <span class="hlt">modeling</span> are combined to predict diffusion of <span class="hlt">Fe</span> in ferropericlase over the entire lower mantle, including the effects of the <span class="hlt">Fe</span> spin transition. A thorough statistical thermodynamic treatment is given to fully incorporate the coexistence of high- and low-spin <span class="hlt">Fe</span> in the <span class="hlt">model</span> of overall <span class="hlt">Fe</span> diffusion in the lower mantle. Pure low-spin <span class="hlt">Fe</span> diffuses approximately 104 times slower than high-spin <span class="hlt">Fe</span> in ferropericlase but <span class="hlt">Fe</span> diffusion of the mixed-spin state is only about 10 times slower than that of high-spin <span class="hlt">Fe</span>. The predicted <span class="hlt">Fe</span> diffusivities demonstrate that ferropericlase is unlikely to be rate limiting in transporting <span class="hlt">Fe</span> in deep earth since much slower <span class="hlt">Fe</span> diffusion in perovskite is predicted.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1997PSSAR.160...49G','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1997PSSAR.160...49G"><span>Snoek Relaxation in <span class="hlt">Fe</span>-Cr Alloys and Interstitial-Substitutional Interaction</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Golovin, I. S.; Blanter, M. S.; Schaller, R.</p> <p>1997-03-01</p> <p>The internal friction (IF) spectra of -<span class="hlt">Fe</span>, <span class="hlt">Fe</span>-Cr ferritic alloys and Cr have been investigated in a frequency range of 0.01 to 10 Hz. A Snoek-type relaxation was found in all the investigated C doped <span class="hlt">Fe</span>-Cr alloys, starting from pure <span class="hlt">Fe</span> and finishing with pure Cr. The temperature location of the Snoek peak (Tmax) in -<span class="hlt">Fe</span> was found to be 315 K (1 Hz). The activation energy deduced from the T - f shift was 0.81 eV. Tmax in Cr was 433 K with an activation energy of 1.11 eV. The Snoek-type peaks in <span class="hlt">Fe</span>-Cr alloys are much wider than in pure <span class="hlt">Fe</span> or pure Cr. The temperature location of the peak versus chromium content curve exhibits a maximum in the vicinity of 35 wt% Cr (Tmax was 573 to 578 K, f 1.2 Hz and the activation energy was about 1.45 eV). It is important that Cr atoms in α-<span class="hlt">Fe</span> have a more pronounced influence on the temperature location of the peak than <span class="hlt">Fe</span> atoms have in chromium. A new <span class="hlt">model</span> based on the atomic interactions is proposed to explain the influence of composition on Snoek peak location. The internal friction has been simulated by a Monte Carlo method, using C-C and C-substitutional atom (s) interaction energies. A <span class="hlt">model</span> of long-range strain-induced (elastic) interaction supplemented by the chemical interaction in the two nearest coordination shells around an immobile substitutional atom was used for the C-s interaction. The interatomic interaction was supposed to affect IF by changing both the carbon atom arrangement (short-range order) and the energy of C atoms in octahedral interstices, and therefore the activation energy of IF. The peak temperatue calculated coincides well with the experimental ones if the value for the chemical interaction in the first coordination shell (Hchem) for C-Cr in <span class="hlt">Fe</span> is - 0.15 eV and for C-<span class="hlt">Fe</span> in Cr +0.15 eV. The difference in the influence of Cr in α-<span class="hlt">Fe</span> and <span class="hlt">Fe</span> in Cr is accounted for by a difference in the elastic and chemical interaction both between the carbon atoms and the substitutional atoms. The relaxation process in</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26787165','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26787165"><span>High performance liquid chromatography of substituted aromatics with the metal-organic framework MIL-100(<span class="hlt">Fe</span>): Mechanism analysis and <span class="hlt">model</span>-based prediction.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Qin, Weiwei; Silvestre, Martin Eduardo; Li, Yongli; Franzreb, Matthias</p> <p>2016-02-05</p> <p>Metal-organic framework (MOF) MIL-100(<span class="hlt">Fe</span>) with well-defined thickness was homogenously coated onto the outer surface of magnetic microparticles via a liquid-phase epitaxy method. The as-synthesized MIL-100(<span class="hlt">Fe</span>) was used as stationary phase for high-performance liquid chromatography (HPLC) and separations of two groups of mixed aromatic hydrocarbons (toluene, styrene and p-xylene; acetanilide, 2-nirtoaniline and 1-naphthylamine) using methanol/water as mobile phase were performed to evaluate its performance. Increasing water content of the mobile phase composition can greatly improve the separations on the expense of a longer elution time. Stepwise elution significantly shortens the elution time of acetanilide, 2-nirtoaniline and 1-naphthylamine mixtures, while still achieving a baseline separation. Combining the experimental results and in-depth <span class="hlt">modeling</span> using a recently developed chromatographic software (ChromX), adsorption equilibrium parameters, including the affinities and maximum capacities, for each analyte toward the MIL-100(<span class="hlt">Fe</span>) are obtained. In addition, the pore diffusivity of aromatic hydrocarbons within MIL-100(<span class="hlt">Fe</span>) was determined to be 5×10(-12)m(2)s(-1). While the affinities of MIL-100(<span class="hlt">Fe</span>) toward the analyte molecules differs much, the maximum capacities of the analytes are in a narrow range with q*MOFmax,toluene=3.55molL(-1), q*MOFmax,styrene or p-xylene=3.53molL(-1), and q*MOFmax,anilines=3.12molL(-1) corresponding to approximately 842 toluene and 838 styrene or p-xylene, and 740 aniline molecules per MIL-100(<span class="hlt">Fe</span>) unit cell, respectively. Copyright © 2016 Elsevier B.V. All rights reserved.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2010-title12-vol3/pdf/CFR-2010-title12-vol3-part233-appA.pdf','CFR'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2010-title12-vol3/pdf/CFR-2010-title12-vol3-part233-appA.pdf"><span>12 CFR Appendix A to <span class="hlt">Part</span> 233 - <span class="hlt">Model</span> Notice</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2010&page.go=Go">Code of Federal Regulations, 2010 CFR</a></p> <p></p> <p>2010-01-01</p> <p>... FUNDING OF UNLAWFUL INTERNET GAMBLING (REGULATION GG) <span class="hlt">Part</span> 233, App. A Appendix A to <span class="hlt">Part</span> 233—<span class="hlt">Model</span> Notice [Date] [Name of foreign sender or foreign banking office] [Address] Re: U.S. Unlawful Internet Gambling... that your institution processed payments through our facilities for Internet gambling transactions...</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li class="active"><span>23</span></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_23 --> <div id="page_24" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li class="active"><span>24</span></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="461"> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2011-title12-vol3/pdf/CFR-2011-title12-vol3-part233-appA.pdf','CFR2011'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2011-title12-vol3/pdf/CFR-2011-title12-vol3-part233-appA.pdf"><span>12 CFR Appendix A to <span class="hlt">Part</span> 233 - <span class="hlt">Model</span> Notice</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2011&page.go=Go">Code of Federal Regulations, 2011 CFR</a></p> <p></p> <p>2011-01-01</p> <p>... FUNDING OF UNLAWFUL INTERNET GAMBLING (REGULATION GG) <span class="hlt">Part</span> 233, App. A Appendix A to <span class="hlt">Part</span> 233—<span class="hlt">Model</span> Notice [Date] [Name of foreign sender or foreign banking office] [Address] Re: U.S. Unlawful Internet Gambling... that your institution processed payments through our facilities for Internet gambling transactions...</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2007E%26PSL.259..119W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2007E%26PSL.259..119W"><span>Partial melting and melt percolation in the mantle: The message from <span class="hlt">Fe</span> isotopes</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Weyer, Stefan; Ionov, Dmitri A.</p> <p>2007-07-01</p> <p>High precision <span class="hlt">Fe</span> isotope measurements have been performed on various mantle peridotites (fertile lherzolites, harzburgites, metasomatised <span class="hlt">Fe</span>-enriched peridotites) and volcanic rocks (mainly oceanic basalts) from different localities and tectonic settings. The peridotites yield an average δ 56<span class="hlt">Fe</span> = 0.01‰ and are significantly lighter than the basalts (average δ 56<span class="hlt">Fe</span> = 0.11‰). Furthermore, the peridotites display a negative correlation of δ 56<span class="hlt">Fe</span> with Mg# indicating a link between δ 56<span class="hlt">Fe</span> and degrees of melt extraction. Taken together, these findings imply that <span class="hlt">Fe</span> isotopes fractionate during partial melting, with heavy isotopes preferentially entering the melt. The slope of depletion trends (δ 56<span class="hlt">Fe</span> versus Mg#) of the peridotites was used to <span class="hlt">model</span> <span class="hlt">Fe</span> isotope fractionation during partial melting, resulting in αmantle-melt ≈ 1.0001-1.0003 or ln αmantle-melt ≈ 0.1-0.3‰. In contrast to most other peridotites investigated in this study, spinel lherzolites and harzburgites from three localities (Horoman, Kamchatka and Lherz) are virtually unaffected by metasomatism. These three sites display a particularly good correlation and define an isotope fractionation factor of ln αmantle-melt ≈ 0.3‰. This <span class="hlt">modelled</span> value implies <span class="hlt">Fe</span> isotope fractionation between residual mantle and mantle-derived melts corresponding to Δ56<span class="hlt">Fe</span> mantle-basalt ≈ 0.2-0.3‰, i.e. significantly higher than the observed difference between averages for all the peridotites and the basalts in this study (corresponding to Δ56<span class="hlt">Fe</span> mantle-basalt ≈ 0.1‰). Either disequilibrium melting increased the <span class="hlt">modelled</span> αmantle-melt for these particular sites or the difference between average peridotite and basalt may be reduced by partial re-equilibration between the isotopically heavy basalts and the isotopically light depleted lithospheric mantle during melt ascent. The slope of the weaker δ 56<span class="hlt">Fe</span>-Mg# trend defined by the combined set of all mantle peridotites from this study is more consistent with</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017MMTB...48.1721K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017MMTB...48.1721K"><span>Critical Evaluations and Thermodynamic Optimizations of the MnO-Mn2O3-SiO2 and <span class="hlt">FeO-Fe</span>2O3-MnO-Mn2O3-SiO2 Systems</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kang, Youn-Bae; Jung, In-Ho</p> <p>2017-06-01</p> <p>A critical evaluation and thermodynamic <span class="hlt">modeling</span> for thermodynamic properties of all oxide phases and phase diagrams in the <span class="hlt">Fe</span>-Mn-Si-O system (MnO-Mn2O3-SiO2 and <span class="hlt">FeO-Fe</span>2O3-MnO-Mn2O3-SiO2 systems) are presented. Optimized Gibbs energy parameters for the thermodynamic <span class="hlt">models</span> of the oxide phases were obtained which reproduce all available and reliable experimental data within error limits from 298 K (25°C) to above the liquidus temperatures at all compositions covering from known oxide phases, and oxygen partial pressure from metal saturation to 0.21 bar. The optimized thermodynamic properties and phase diagrams are believed to be the best estimates presently available. Slag (molten oxide) was <span class="hlt">modeled</span> using the modified quasichemical <span class="hlt">model</span> in the pair approximation. Olivine (<span class="hlt">Fe</span>2SiO4-Mn2SiO4) was <span class="hlt">modeled</span> using two-sublattice <span class="hlt">model</span> in the framework of the compound energy formalism (CEF), while rhodonite (MnSiO3-<span class="hlt">Fe</span>SiO3) and braunite (Mn7SiO_{12} with excess Mn2O3) were <span class="hlt">modeled</span> as simple Henrian solutions. It is shown that the already developed <span class="hlt">models</span> and databases of two spinel phases (cubic- and tetragonal-(<span class="hlt">Fe</span>, Mn)3O4) using CEF [Kang and Jung, J. Phys. Chem. Solids (2016), vol. 98, pp. 237-246] can successfully be integrated into a larger thermodynamic database to be used in practically important higher order system such as silicate. The database of the <span class="hlt">model</span> parameters can be used along with a software for Gibbs energy minimization in order to calculate any type of phase diagram section and thermodynamic properties.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3995512','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3995512"><span>EMGD-<span class="hlt">FE</span>: an open source graphical user interface for estimating isometric muscle forces in the lower limb using an EMG-driven <span class="hlt">model</span></span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p></p> <p>2014-01-01</p> <p>Background This paper describes the “EMG Driven Force Estimator (EMGD-<span class="hlt">FE</span>)”, a Matlab® graphical user interface (GUI) application that estimates skeletal muscle forces from electromyography (EMG) signals. Muscle forces are obtained by numerically integrating a system of ordinary differential equations (ODEs) that simulates Hill-type muscle dynamics and that utilises EMG signals as input. In the current version, the GUI can estimate the forces of lower limb muscles executing isometric contractions. Muscles from other <span class="hlt">parts</span> of the body can be tested as well, although no default values for <span class="hlt">model</span> parameters are provided. To achieve accurate evaluations, EMG collection is performed simultaneously with torque measurement from a dynamometer. The computer application guides the user, step-by-step, to pre-process the raw EMG signals, create inputs for the muscle <span class="hlt">model</span>, numerically integrate the ODEs and analyse the results. Results An example of the application’s functions is presented using the quadriceps femoris muscle. Individual muscle force estimations for the four components as well the knee isometric torque are shown. Conclusions The proposed GUI can estimate individual muscle forces from EMG signals of skeletal muscles. The estimation accuracy depends on several factors, including signal collection and <span class="hlt">modelling</span> hypothesis issues. PMID:24708668</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1999GeCoA..63.1517K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1999GeCoA..63.1517K"><span>Reactive <span class="hlt">Fe</span>(II) layers in deep-sea sediments</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>König, Iris; Haeckel, Matthias; Drodt, Matthias; Suess, Erwin; Trautwein, Alfred X.</p> <p>1999-05-01</p> <p>The percentage of the structural <span class="hlt">Fe</span>(II) in clay minerals that is readily oxidized to <span class="hlt">Fe</span>(III) upon contact with atmospheric oxygen was determined across the downcore tan-green color change in Peru Basin sediments. This latent fraction of reactive <span class="hlt">Fe</span>(II) was only found in the green strata, where it proved to be large enough to constitute a deep reaction layer with respect to the pore water O 2 and NO 3-. Large variations were detected in the proportion of the reactive <span class="hlt">Fe</span>(II) concentration to the organic matter content along core profiles. Hence, the commonly observed tan-green color change in marine sediments marks the top of a reactive <span class="hlt">Fe</span>(II) layer, which may represent the major barrier to the movement of oxidation fronts in pelagic subsurface sediments. This is also demonstrated by numerical <span class="hlt">model</span> simulations. The findings imply that geochemical barriers to pore water oxidation fronts form diagenetically in the sea floor wherever the stage of iron reduction is reached, provided that the sediments contain a significant amount of structural iron in clay minerals.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017AGUFMSH41A2741P','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017AGUFMSH41A2741P"><span>Observation and <span class="hlt">modelling</span> of the <span class="hlt">Fe</span> XXI line profile observed by IRIS during the impulsive phase of flares</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Polito, V.; Testa, P.; De Pontieu, B.; Allred, J. C.</p> <p>2017-12-01</p> <p>The observation of the high temperature (above 10 MK) <span class="hlt">Fe</span> XXI 1354.1 A line with the Interface Region Imaging Spectrograph (IRIS) has provided significant insights into the chromospheric evaporation process in flares. In particular, the line is often observed to be completely blueshifted, in contrast to previous observations at lower spatial and spectral resolution, and in agreement with predictions from theoretical <span class="hlt">models</span>. Interestingly, the line is also observed to be mostly symmetric and with a large excess above the thermal width. One popular interpretation for the excess broadening is given by assuming a superposition of flows from different loop strands. In this work, we perform a statistical analysis of <span class="hlt">Fe</span> XXI line profiles observed by IRIS during the impulsive phase of flares and compare our results with hydrodynamic simulations of multi-thread flare loops performed with the 1D RADYN code. Our results indicate that the multi-thread <span class="hlt">models</span> cannot easily reproduce the symmetry of the line and that some other physical process might need to be invoked in order to explain the observed profiles.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/16522928','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/16522928"><span>Cooking and <span class="hlt">Fe</span> fortification have different effects on <span class="hlt">Fe</span> bioavailability of bread and tortillas.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Hernández, Miguel; Sousa, Virginia; Villalpando, Salvador; Moreno, Ambar; Montalvo, Irene; López-Alarcón, Mardya</p> <p>2006-02-01</p> <p>To identify iron sources for wheat- (WF) and corn-flour (CF) fortification taking into account the effect of cooking. Sixty-six <span class="hlt">Fe</span>-depleted rats were replete with various <span class="hlt">Fe</span> sources. <span class="hlt">Fe</span> bioavailability and utilization in wheat bread (WB) and corn tortillas (CT) fortified with various <span class="hlt">Fe</span> sources was assessed after the depletion and repletion periods. Baking decreased the phytates content of WF by 97%. Improvements in Hb and <span class="hlt">Fe</span>Hb were greater in rats fed unfortified WB than in those fed unfortified WF. <span class="hlt">Fe</span> fortification had no benefit. In contrast, phytates content was unchanged by tortilla preparation, but fortification improved iron availability. Iron bioavailability indicators were best in rats fed CT fortified with ferrous sulfate and Na<span class="hlt">Fe</span>(III)EDTA than in those fed unfortified CT or CT plus reduced <span class="hlt">Fe</span>. We concluded that baking WF bread improved the bioavailability of native <span class="hlt">Fe</span> with no further effect of fortification. Pan-cooking of lime-treated CF did not improve <span class="hlt">Fe</span> bioavailability, but addition of Ferrous sulfate or Na<span class="hlt">Fe</span>(III)EDTA did it, despite the high phytate and calcium content of tortillas.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/19955534','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/19955534"><span>Local smoke-free policy development in Santa <span class="hlt">Fe</span>, Argentina.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Sebrié, Ernesto M; Glantz, Stanton A</p> <p>2010-04-01</p> <p>To describe the process of approval and implementation of a comprehensive smoke-free law in the province of Santa <span class="hlt">Fe</span>, Argentina, between 2005 and 2009. Review of the Santa <span class="hlt">Fe</span> smoke-free legislation, articles published in local newspapers and documentation on two lawsuits filed against the law, and interviews with key individuals in Santa <span class="hlt">Fe</span>. Efforts to implement smoke-free policies in Santa <span class="hlt">Fe</span> began during the 1990s without success, and resumed in 2005 when the provincial Legislature approved the first 100% smoke-free subnational law in Argentina. There was no strong opposition during the discussions within the legislature. As in other <span class="hlt">parts</span> of the world, pro-tobacco industry interests attempted to block the implementation of the law using well known strategies. These efforts included a controversy media campaign set up, the creation of a hospitality industry association and a virtual smokers' rights group, the introduction of a counterproposal seeking modification of the law, the challenge of the law in the Supreme Court, and the proposal of a weak national bill that would 'conflict' with the subnational law. Tobacco control advocates sought media attention as a strategy to protect the law. Santa <span class="hlt">Fe</span> is the first subnational jurisdiction in Latin America to have enacted a comprehensive smoke-free policy following the recommendations of the World Health Organization (WHO) Framework Convention on Tobacco Control. After 3 years of implementation, pro-tobacco industry forces failed to undermine the law. Other subnational jurisdictions in Argentina, as well as in Mexico and Brazil are following the Santa <span class="hlt">Fe</span> example.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011AsBio..11..471W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011AsBio..11..471W"><span><span class="hlt">FeS/S/Fe</span>S2 Redox System and Its Oxidoreductase-like Chemistry in the Iron-Sulfur World</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wang, Wei; Yang, Bin; Qu, Youpeng; Liu, Xiaoyang; Su, Wenhui</p> <p>2011-06-01</p> <p>The iron-sulfur world (ISW) theory is an intriguing prediction regarding the origin of life on early Earth. It hypothesizes that life arose as a geochemical process from inorganic starting materials on the surface of sulfide minerals in the vicinity of deep-sea hot springs. During the last two decades, many experimental studies have been carried out on this topic, and some interesting results have been achieved. Among them, however, the processes of carbon/nitrogen fixation and biomolecular assembly on the mineral surface have received an inordinate amount of attention. To the present, an abiotic <span class="hlt">model</span> for the oxidation-reduction of intermediates participating in metabolic pathways has been ignored. We examined the oxidation-reduction effect of a prebiotic <span class="hlt">FeS/S/Fe</span>S2 redox system on the interconversion between several pairs of ±-hydroxy acids and ±-keto acids (i.e., lactate/pyruvate, malate/oxaloacetate, and glycolate/glyoxylate). We found that, in the absence of <span class="hlt">Fe</span>S, elemental sulfur (S) oxidized ±-hydroxy acids to form corresponding keto acids only at a temperature higher than its melting point (113°C); in the presence of <span class="hlt">Fe</span>S, such reactions occurred more efficiently through a coupled reaction mechanism, even at a temperature below the phase transition point of S. On the other hand, <span class="hlt">Fe</span>S was shown to have the capacity to reversibly reduce the keto acids. Such an oxidoreductase-like chemistry of the <span class="hlt">FeS/S/Fe</span>S2 redox system suggests that it can determine the redox homeostasis of metabolic intermediates in the early evolutionary phase of life. The results provide a possible pathway for the development of primordial redox biochemistry in the iron-sulfur world.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018AIPC.1959g0010E','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018AIPC.1959g0010E"><span>About the choice of Gibbs' potential for <span class="hlt">modelling</span> of FCC ↔ HCP transformation in <span class="hlt">Fe</span>MnSi-based shape memory alloys</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Evard, Margarita E.; Volkov, Aleksandr E.; Belyaev, Fedor S.; Ignatova, Anna D.</p> <p>2018-05-01</p> <p>The choice of Gibbs' potential for microstructural <span class="hlt">modeling</span> of FCC ↔ HCP martensitic transformation in <span class="hlt">Fe</span>Mn-based shape memory alloys is discussed. Threefold symmetry of the HCP phase is taken into account on specifying internal variables characterizing volume fractions of martensite variants. Constraints imposed on <span class="hlt">model</span> constants by thermodynamic equilibrium conditions are formulated.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2014JPhCS.568b2024K','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2014JPhCS.568b2024K"><span>Emergence of superconductivity and magnetic ordering tuned by <span class="hlt">Fe</span>-vacancy in alkali-metal <span class="hlt">Fe</span> chalcogenides Rbx<span class="hlt">Fe</span>2-ySe2</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Kobayashi, Yoshiaki; Kototani, Shouhei; Itoh, Masayuki; Sato, Masatoshi</p> <p>2014-12-01</p> <p>Samples of Rbx<span class="hlt">Fe</span>2-ySe2 exhibiting superconductivity [superconducting (SC) samples] undergo a phase-separation into two phases, a <span class="hlt">Fe</span>-vacancy ordered phase with antiferromagnetic (AFM) transition at TN1~500 K (AFM1 phase) and a phase with little <span class="hlt">Fe</span>- vacancy and SC transition at Tc~30 K (SC phase). The samples of Rbx<span class="hlt">Fe</span>2-ySe2 exhibiting no SC behaviour (non-SC samples) are phase-separated into three phases, the AFM1 phase, another AFM phase with TN2 ~150 K (AFM2 phase), and a paramagnetic phase with no SC transitions (paramagnetic non-SC phase). In this paper, we present the experimental results of magnetic susceptibility, electrical resistivity, and NMR measurements on single crystals of Rbx<span class="hlt">Fe</span>2-ySe2 to reveal physical properties of these co-existing phases in the SC and non-SC samples. The 87Rb and 77Se NMR spectra show that the <span class="hlt">Fe</span> vacancy concentration is very small in the <span class="hlt">Fe</span> planes of the SC phase, whereas the AFM2 and paramagnetic non-SC phases in non-SC samples have larger amount of <span class="hlt">Fe</span> vacancies. The randomness induced by the <span class="hlt">Fe</span> vacancy in the non-SC samples makes the AFM2 and paramagnetic non-SC phases insulating/semiconducting and magnetically active, resulting in the absence of the superconductivity in Rbx<span class="hlt">Fe</span>2-ySe2.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2006ihy..workE.147S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2006ihy..workE.147S"><span><span class="hlt">FE</span>-XIII Infrared / <span class="hlt">FE</span>-XIV Green Line Ratio Diagnostics (P55)</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Srivastava, A. K.; et al.</p> <p>2006-11-01</p> <p>aks.astro.itbhu@gmail.com We consider the first 27-level atomic <span class="hlt">model</span> of <span class="hlt">Fe</span> XIII (5.9 < log Te < 6.4 K) to estimate its ground level populations, taking account of electron as well as proton collisional excitations and de-excitations, radiative cascades, radiative excitations and de-excitations. Radiative cascade is important but the effect of dilution factor is negligible at higher electron densities. The 3 P1-3P0 and 3P2-3P1 transitions in the ground configuration 3s2 3p2 of <span class="hlt">Fe</span> XIII result in two forbidden coronal emission lines in the infrared region, namely 10747 Å and 10798 Å., while the 5303 Å green line is formed in the 3s2 3p 2 2 ground configuration of <span class="hlt">Fe</span> XIV as a result of P3 / 2 - P1 / 2 magnetic dipole transition. The line-widths of appropriate pair of forbidden coronal emission lines observed simultaneously can be useful diagnostic tool to deduce temperature and non-thermal velocity in the large scale coronal structures using intensity ratios of the lines as the temperature signature, instead of assuming ion temperature to be equal to the electron temperature. Since the line intensity ratios IG5303/IIR10747 and IG5303/IIR10798 have very week density dependence, they are ideal monitors of temperature mapping in the solar corona.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2012GeCoA..89...46W','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2012GeCoA..89...46W"><span>Experimental determination of iron isotope fractionations among <mml:msubsup><span class="hlt">Fe</span> aq 2 + -<span class="hlt">Fe</span>Saq-Mackinawite at low temperatures: Implications for the rock record</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Wu, Lingling; Druschel, Greg; Findlay, Alyssa; Beard, Brian L.; Johnson, Clark M.</p> <p>2012-07-01</p> <p>The <span class="hlt">Fe</span> isotope fractionation factors among aqueous ferrous iron (<mml:msubsup><span class="hlt">Fe</span> aq 2 +), aqueous <span class="hlt">Fe</span>S clusters (<span class="hlt">Fe</span>Saq), and nanoparticulate mackinawite under neutral and mildly acidic and alkaline pH conditions have been determined using the three-isotope method. Combined voltammetric analysis and geochemical <span class="hlt">modeling</span> were used to determine the <span class="hlt">Fe</span> speciation in the experimental systems. The equilibrium 56<span class="hlt">Fe</span>/54<span class="hlt">Fe</span> fractionation factor at 20 °C and pH 7 has been determined to be -0.32 ± 0.29 (2σ)‰ between <mml:msubsup><span class="hlt">Fe</span> aq 2 + (minor <span class="hlt">Fe</span>Saq also present in the experiment) and mackinawite. This fractionation factor was essentially constant when pH was changed to 6 or 8. When equal molarity of HS- and <mml:msubsup><span class="hlt">Fe</span> aq 2 + were added to the system, however, the isotopic fractionation at pH 7 changed to -0.64 ± 0.36 (2σ)‰, correlating with a significant increase in the proportion of <span class="hlt">Fe</span>HS+ and <span class="hlt">Fe</span>Saq. These results highlight a more important role of aqueous <span class="hlt">Fe</span>-S speciation in the equilibrium <span class="hlt">Fe</span> isotope fractionation factor than recognized in previous studies. The isotopic fractionation remained constant when temperature was increased from 20 °C to 35 °C for fractionation factors between <mml:msubsup><span class="hlt">Fe</span> aq 2 + , and mackinawite and between dominantly <span class="hlt">Fe</span>HS+ and mackinawite. Synthesis experiments similar to those of Butler et al. (2005) and Guilbaud et al. (2010) at pH 4 show consistent results: over time, the aqueous <span class="hlt">Fe</span>-mackinawite fractionation decreases but even after 38 days of aging the fractionation factor is far from the equilibrium value inferred using the three-isotope method. In contrast, at near-neutral pH the fractionation factor for the synthesis experiment reached the equilibrium value in 38 days. These differences are best explained by noting that at low pH the <span class="hlt">Fe</span>S mackinawite particles coarsen more rapidly via particle aggregation, which limits isotopic exchange, whereas at higher pH mackinawite aggregation is limited, and <span class="hlt">Fe</span> isotope exchange</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.osti.gov/servlets/purl/925605','SCIGOV-STC'); return false;" href="https://www.osti.gov/servlets/purl/925605"><span>Pore-scale spectral induced polarization (SIP) signaturesassociated with <span class="hlt">Fe</span>S biomineral transformations</span></a></p> <p><a target="_blank" href="http://www.osti.gov/search">DOE Office of Scientific and Technical Information (OSTI.GOV)</a></p> <p>Slater, Lee; Ntarlagiannis, Dimitrios; Personna, Yves R.</p> <p>2007-10-01</p> <p>The authors measured Spectral Induced Polarization (SIP) signatures in sand columns during (1) <span class="hlt">Fe</span>S biomineralization produced by sulfate reducing bacteria (D. vulgaris) under anaerboci conditions, and (2) subsequent biomineral dissolution upon return to an aerobic state. The low-frequency (0.1-10 Hz peak) relaxations produced during biomineralization can be <span class="hlt">modeled</span> with a Cole-Cole formulation, from which the evolution of the polarization magnitude and relaxation length scale can be estimated. They find that the <span class="hlt">modeled</span> time constant is consistent with the polarizable elements being biomineral encrused pores. Evolution of the <span class="hlt">model</span> parameters is consistent with <span class="hlt">Fe</span>S surface area increases and pore-size reduction duringmore » biomineral growth, and subsequent biomineral dissolution (<span class="hlt">Fe</span>S surface area decreases and pore expansion) upon return to the aerobic state. They conclude that SIP signatures are diagnostic of pore-scale geometrical changes associated with <span class="hlt">Fe</span>S biomineralization by sulfate reducing bacteria.« less</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017GeCoA.208..368Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017GeCoA.208..368Z"><span>Coupled extremely light Ca and <span class="hlt">Fe</span> isotopes in peridotites</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhao, Xinmiao; Zhang, Zhaofeng; Huang, Shichun; Liu, Yufei; Li, Xin; Zhang, Hongfu</p> <p>2017-07-01</p> <p>Large metal stable isotopic variations have been observed in both extraterrestrial and terrestrial samples. For example, Ca exhibits large mass-dependent isotopic variation in terrestrial igneous rocks and mantle minerals (on the order of ∼2‰ variation in 44Ca/40Ca). A thorough assessment and understanding of such isotopic variations in peridotites provides important constraints on the evolution and compositon of the Earth's mantle. In order to better understand the Ca and <span class="hlt">Fe</span> isotopic variations in terrestrial silicate rocks, we report Ca isotopic compositions in a set of peridotitic xenoliths from North China Craton (NCC), which have been studied for <span class="hlt">Fe</span> isotopes. These NCC peridotites have large Ca and <span class="hlt">Fe</span> isotopic variations, with δ44/40Ca ranging from -0.08 to 0.92 (delta value relative to SRM915a) and δ57/54<span class="hlt">Fe</span> (delta value relative to IRMM-014) ranging from -0.61 to 0.16, and these isotopic variations are correlated with large Mg# (100 × Mg/(Mg + <span class="hlt">Fe</span>) molar ratio) variation, ranging from 80 to 90. Importantly, NCC <span class="hlt">Fe</span>-rich peridotites have the lowest 44Ca/40Ca and 57<span class="hlt">Fe</span>/54<span class="hlt">Fe</span> ratios in all terrestrial silicate rocks. In contrast, although ureilites, mantle rocks from a now broken differentiated asteroid(s), have large Mg# variation, from 70 to 92, they have very limited δ57<span class="hlt">Fe</span>/54<span class="hlt">Fe</span> variation (0.03-0.21, delta value relative to IRMM-014). Our <span class="hlt">model</span> calculations show that the coupled extremely light Ca-<span class="hlt">Fe</span> isotopic signatures in NCC <span class="hlt">Fe</span>-rich peridotites most likely reflect kinetic isotopic fractionation during melt-peridotite reaction on a timescale of several to 104 years. In addition, our new data and compiled literature data show a possible compositional effect on the inter-mineral Ca isotopic fractionation between co-existing clinopyroxene and orthopyroxene pairs.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2008AGUFM.B11B0364S','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2008AGUFM.B11B0364S"><span>Oxidation of Structural <span class="hlt">Fe</span>(II) in Biotite by Lithotrophic <span class="hlt">Fe</span>(II)-oxidizing microorganisms</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Shelobolina, E.; Blöthe, M.; Xu, H.; Konishi, H.; Roden, E.</p> <p>2008-12-01</p> <p>The potential for microbial involvement in the oxidation of <span class="hlt">Fe</span>(II)-bearing phyllosilicates is an understudied aspect of soil/sediment <span class="hlt">Fe</span> biogeochemistry. An important property of structural <span class="hlt">Fe</span> in <span class="hlt">Fe</span>-bearing smectites is their ability to undergo multiple redox cycles without being mobilized. An obvious choice of mineral substrate for enumeration/isolation of <span class="hlt">Fe</span>(II)-oxidizing microorganisms would be reduced smectite. But reduced smectite is readily oxidized by air. That is why biotite was chosen as a substrate for this study. In contrast to smectite, biotite is more stable in the presence of air, but incapable of redox cycling. Once <span class="hlt">Fe</span>(II) is oxidized, biotite is weathered to expendable 2:1 phyllosilicates or kaolinite. First, we evaluated the ability of a neutral-pH lithoautotrophic nitrate-reducing enrichment culture (MPI culture), recovered by Straub et al (Appl. Environ. Microbiol., 1996, 62:1458-1460) from a freshwater ditch, to oxidize two different specimens of biotite. The culture was capable of multiple transfers in anaerobic nitrate-containing biotite suspensions. The growth of MPI culture resulted in decrease of 0.5 N HCl-extractable <span class="hlt">Fe</span>(II) content and simultaneous nitrate reduction. Cell yields were comparable to those observed for other neutral-pH lithoautotrophic <span class="hlt">Fe</span>(II)-oxidizing bacteria. High resolution TEM examination revealed structural and chemical changes at the edges of oxidized biotite and formation of reddish amorphous precipitates dominated by Si and <span class="hlt">Fe</span>. To further evaluate efficiency of biotite for recovery of oxygen- and nitrate-dependent <span class="hlt">Fe</span>(II) oxidizing cultures microbial enumeration study was performed using subsoil from a site near Madison, WI. The soil is rich in <span class="hlt">Fe</span>-bearing smectite and shows evidence of redoximorphic features. The enumeration of <span class="hlt">Fe</span>(II) oxidizing organisms from this sediment showed 10-fold higher efficiency of biotite over soluble <span class="hlt">Fe</span>(II) for recovery of <span class="hlt">Fe</span>(II)-oxidizers. Isolation and identification of both aerobic and</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2008E%26PSL.268..212Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2008E%26PSL.268..212Z"><span>Effect of Ni on <span class="hlt">Fe</span> <span class="hlt">Fe</span>S phase relations at high pressure and high temperature</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zhang, Li; Fei, Yingwei</p> <p>2008-04-01</p> <p>A series of melting experiments in the <span class="hlt">Fe</span>-rich portion of the <span class="hlt">Fe</span>-Ni-S system have been conducted at 19-23 GPa and 800-1100 °C. The solubility of S in the <span class="hlt">Fe</span>-Ni solid alloy and the eutectic melting in the <span class="hlt">Fe</span>-Ni-S system were determined as a function of Ni content. The maximum S solubility in the <span class="hlt">Fe</span>-Ni alloy is 2.7 wt.% at 20 GPa and the eutectic temperature. The eutectic melting temperature in the <span class="hlt">Fe</span>-Ni(5wt.%)-S system is ~ 1000 °C lower than the melting point of pure <span class="hlt">Fe</span> at 20 GPa. We also found that Ni can substitute <span class="hlt">Fe</span> in the <span class="hlt">Fe</span> 3S structure to form (<span class="hlt">Fe</span>,Ni) 3S solid solutions up to at least a <span class="hlt">Fe</span>/Ni atomic ratio of 0.5. Similar to melting behavior in the <span class="hlt">Fe-Fe</span>S system, the eutectic melting relations in the <span class="hlt">Fe</span>-Ni-S system could produce inner and outer cores with the right light element balance to account for the density difference between the solid inner core and the liquid outer core.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2006AGUFM.V23C0636Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2006AGUFM.V23C0636Z"><span>The role of water in generating <span class="hlt">Fe</span>-depletion and the calc-alkaline trend</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zimmer, M. M.; Plank, T.</p> <p>2006-12-01</p> <p>Describing a magmatic suite as calc-alkaline (CA) or tholeiitic (TH) is a first order characterization, but existing classification schemes (AFM ternary plots and <span class="hlt">Fe</span>O*/MgO vs. SiO2) may convolute magmatic processes and can result in contradictory classification. The salient feature of TH vs. CA evolution is the extent of <span class="hlt">Fe</span> enrichment or depletion in the magma. A plot of <span class="hlt">Fe</span>O* vs. MgO provides the most straightforward way to quantify <span class="hlt">Fe</span> enrichment and to develop <span class="hlt">models</span> for its origin. We present a new quantitative classification utilizing the <span class="hlt">Fe</span>O*-MgO plot, the tholeiitic index (THI) = <span class="hlt">Fe</span>3-5/<span class="hlt">Fe</span>8 (<span class="hlt">Fe</span>3-5=average <span class="hlt">Fe</span>O* at 3-5 wt% MgO; <span class="hlt">Fe</span>8=<span class="hlt">Fe</span>O* at 8 wt% MgO). THI of 1.2 indicates 20% <span class="hlt">Fe</span>O* enrichment from a magma's starting composition at <span class="hlt">Fe</span>8, while THI of 0.8 indicates 20% depletion in <span class="hlt">Fe</span>O*. A magmatic suite is CA if THI is <1, and TH if THI is >1. Arcs range from 0.6 to 1.1, back arc basins from 1.1-1.3, and MORBs are \\ge1.6. This classification allows comparison of magmatic evolution on a global basis, regardless of starting composition, and is useful for quantitative comparison to liquid line of descent <span class="hlt">models</span>. Hypotheses for generating CA magmas include high water contents, high pressure of crystallization, high oxygen fugacity, and high Mg# andesitic starting compositions. In order to test the control of H2O, we compare the THI to average magmatic water contents from undegassed melt inclusions and glasses (S>1000 ppm or CO2>50 ppm) from twenty-eight arc volcanoes and back arc basins, including new water contents from seven Aleutian volcanoes. The resulting negative correlation (R2=0.8) between water concentration and THI (with end-members at 0.8 wt% H2O, THI =1.3 and 6.1 wt% H2O, THI = 0.6) suggests water plays a fundamental role in generating the CA fractionation trend. MORB data plot off the trend at a higher THI, possibly related to lower oxygen fugacity during melting and/or crystallization. <span class="hlt">Models</span> using the pMelts program are consistent with experimentally</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2008HyInt.182..113D','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2008HyInt.182..113D"><span>Out-of-equilibrium Sm <span class="hlt">Fe</span> based phases</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Djéga-Mariadassou, C.; Bessais, L.</p> <p>2008-02-01</p> <p>Structure and magnetic properties of nanocrystalline P6/mmm out-of-equilibrium precursors of hard magnetic R-3m Sm2(<span class="hlt">Fe</span>,M)17C (M=Ga,Si,) and I4/mmm Sm(<span class="hlt">Fe</span>,Co,Ti)11 equilibrium phases, are presented. Their structure is explained with a <span class="hlt">model</span> ground on the R1 - s T5 + 2 s formula (R=rare-earth, s=vacancy rate, T=transition metal) where s Sm atoms are statistically substituted by s transition metal pairs. The Rietveld analysis (RA) provides the stoichiometry of the precursors, 1:9 and 1:10, respectively precursor of 2:17 and 1:12 phases. The interpretation of the Mössbauer spectra of the 1:9 and 1:10 phases, is based on the correlation between δ and the Wigner Seitz Cell volumes, calculated from the structural parameters. The δ behaviour of each crystallographic site versus Co content, defines the Co location while it confirms that of Si and Ga obtained by RA. Substitution occurs in 3 g site, whatever Co or M. The Sm(<span class="hlt">Fe</span>,Co,Ti)10 and Sm(<span class="hlt">Fe</span>,M)9C Curie temperature (Tc) are compared to those of the equilibrium phases, the effects of <span class="hlt">Fe</span> substitution and C addition are discussed. The maximum μ 0Hc is obtained for low M or Co content, for auto-coherent diffraction domain size ˜30 nm. Sm<span class="hlt">Fe</span>8.75Ga0.25C and Sm<span class="hlt">Fe</span>8.75Si0.25C with Tc of 680 and 690 K, show respectively Mr and μ 0Hc of 58 emu/g, 27 kOe and 95 emu/g, 15 kOe, values higher than those obtained for Sm2(<span class="hlt">Fe</span>,M)17 carbides.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/29260560','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/29260560"><span><span class="hlt">Fe(II)/Fe</span>(III)-Catalyzed Intramolecular Didehydro-Diels-Alder Reaction of Styrene-ynes.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Mun, Hyeon Jin; Seong, Eun Young; Ahn, Kwang-Hyun; Kang, Eun Joo</p> <p>2018-02-02</p> <p>The intramolecular didehydro-Diels-Alder reaction of styrene-ynes was catalyzed by <span class="hlt">Fe</span>(II) and <span class="hlt">Fe</span>(III) to produce various naphthalene derivatives under microwave heating conditions. Mechanistic calculations found that the <span class="hlt">Fe</span>(II) catalyst activates the styrenyl diene in an inverse-electron-demand Diels-Alder reaction, and the consecutive dehydrogenation reaction can be promoted by either <span class="hlt">Fe</span>(II)-catalyzed direct dehydrogenation or an <span class="hlt">Fe</span>(III)-catalyzed rearomatization/dehydrogenation pathway.</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li class="active"><span>24</span></li> <li><a href="#" onclick='return showDiv("page_25");'>25</a></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_24 --> <div id="page_25" class="hiddenDiv"> <div class="row"> <div class="col-sm-12"> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li class="active"><span>25</span></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div> </div> <div class="row"> <div class="col-sm-12"> <ol class="result-class" start="481"> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2018JPCM...30f5502A','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2018JPCM...30f5502A"><span>Electronic structure of <span class="hlt">Fe</span>1.08Te bulk crystals and epitaxial <span class="hlt">Fe</span>Te thin films on Bi2Te3</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Arnold, Fabian; Warmuth, Jonas; Michiardi, Matteo; Fikáček, Jan; Bianchi, Marco; Hu, Jin; Mao, Zhiqiang; Miwa, Jill; Singh, Udai Raj; Bremholm, Martin; Wiesendanger, Roland; Honolka, Jan; Wehling, Tim; Wiebe, Jens; Hofmann, Philip</p> <p>2018-02-01</p> <p>The electronic structure of thin films of <span class="hlt">Fe</span>Te grown on Bi2Te3 is investigated using angle-resolved photoemission spectroscopy, scanning tunneling microscopy and first principles calculations. As a comparison, data from cleaved bulk <span class="hlt">Fe</span>1.08Te taken under the same experimental conditions is also presented. Due to the substrate and thin film symmetry, <span class="hlt">Fe</span>Te thin films grow on Bi2Te3 in three domains, rotated by 0°, 120°, and 240°. This results in a superposition of photoemission intensity from the domains, complicating the analysis. However, by combining bulk and thin film data, it is possible to <span class="hlt">partly</span> disentangle the contributions from three domains. We find a close similarity between thin film and bulk electronic structure and an overall good agreement with first principles calculations, assuming a p-doping shift of 65 meV for the bulk and a renormalization factor of around two. By tracking the change of substrate electronic structure upon film growth, we find indications of an electron transfer from the <span class="hlt">Fe</span>Te film to the substrate. No significant change of the film’s electronic structure or doping is observed when alkali atoms are dosed onto the surface. This is ascribed to the film’s high density of states at the Fermi energy. This behavior is also supported by the ab initio calculations.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/18433827','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/18433827"><span>Observed and <span class="hlt">modeled</span> seasonal trends in dissolved and particulate Cu, <span class="hlt">Fe</span>, Mn, and Zn in a mining-impacted stream.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Butler, Barbara A; Ranville, James F; Ross, Philippe E</p> <p>2008-06-01</p> <p>North Fork Clear Creek (NFCC) in Colorado, an acid-mine drainage (AMD) impacted stream, was chosen to examine the distribution of dissolved and particulate Cu, <span class="hlt">Fe</span>, Mn, and Zn in the water column, with respect to seasonal hydrologic controls. NFCC is a high-gradient stream with discharge directly related to snowmelt and strong seasonal storms. Additionally, conditions in the stream cause rapid precipitation of large amounts of hydrous iron oxides (HFO) that sequester metals. Because AMD-impacted systems are complex, geochemical <span class="hlt">modeling</span> may assist with predictions and/or confirmations of processes occurring in these environments. This research used Visual-MINTEQ to determine if field data collected over a two and one-half year study would be well represented by <span class="hlt">modeling</span> with a currently existing <span class="hlt">model</span>, while limiting the number of processes <span class="hlt">modeled</span> and without modifications to the existing <span class="hlt">model</span>'s parameters. Observed distributions between dissolved and particulate phases in the water column varied greatly among the metals, with average dissolved fractions being >90% for Mn, approximately 75% for Zn, approximately 30% for Cu, and <10% for <span class="hlt">Fe</span>. A strong seasonal trend was observed for the metals predominantly in the dissolved phase (Mn and Zn), with increasing concentrations during base-flow conditions and decreasing concentrations during spring-runoff. This trend was less obvious for Cu and <span class="hlt">Fe</span>. Within hydrologic seasons, storm events significantly influenced in-stream metals concentrations. The most simplified <span class="hlt">modeling</span>, using solely sorption to HFO, gave predicted percentage particulate Cu results for most samples to within a factor of two of the measured values, but <span class="hlt">modeling</span> data were biased toward over-prediction. About one-half of the percentage particulate Zn data comparisons fell within a factor of two, with the remaining data being under-predicted. Slightly more complex <span class="hlt">modeling</span>, which included dissolved organic carbon (DOC) as a solution phase ligand</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2003AGUFM.U41A..03H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2003AGUFM.U41A..03H"><span>Geochemical Constraints on Core-Mantle Interaction from <span class="hlt">Fe</span>/Mn Ratios</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Humayun, M.; Qin, L.</p> <p>2003-12-01</p> <p>The greater density of liquid iron alloy, and its immiscibility with silicate, maintains the physical separation of the core from the mantle. There are no a priori reasons, however, why the Earth's mantle should be chemically isolated from the core. Osmium isotopic variations in mantle plumes have been interpreted in terms of interaction between outer core and the source regions of deep mantle plumes. If chemical transport occurs across the core-mantle boundary its mechanism remains to be established. The Os isotope evidence has also been interpreted as the signatures of subducted Mn-sediments, which are known to have relatively high Pt/Os. In the mantle, <span class="hlt">Fe</span> occurs mainly as the divalent ferrous ion, and Mn occurs solely as a divalent ion, and both behave in a geochemically coherent manner because of similarity in ionic charge and radius. Thus, the <span class="hlt">Fe</span>/Mn ratio is a planetary constant insensitive to processes of mantle differentiation by partial melting. Two processes may perturb the ambient mantle <span class="hlt">Fe</span>/Mn of 60: a) the subduction of Mn-sediments should decrease the <span class="hlt">Fe</span>/Mn ratio in plume sources, while b) chemical transport from the outer core may increase the <span class="hlt">Fe</span>/Mn ratio. The differentiation of the liquid outer core to form the solid inner core may increase abundances of the light element constituents (<span class="hlt">Fe</span>S, <span class="hlt">Fe</span>O, etc.) to the point of exsolution from the core at the CMB. The exact rate of this process is determined by the rate of inner core growth. Two end-member <span class="hlt">models</span> include 1) inner core formation mainly prior to 3.5 Ga with heat release dominated by radioactive sources, or 2) inner core formation occurring mainly in the last 1.5 Ga with heat release dominated by latent heat. This latter <span class="hlt">model</span> would imply large fluxes of <span class="hlt">Fe</span> into the sources of modern mantle plumes. Existing <span class="hlt">Fe</span>/Mn data for Gorgona and Hawaiian samples place limits on both these processes. We describe a new procedure for the precise determination of the <span class="hlt">Fe</span>/Mn ratio in magmatic rocks by ICP-MS. This</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/26156094','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/26156094"><span>Vertical distribution of <span class="hlt">Fe</span> and <span class="hlt">Fe</span>(III)-reducing bacteria in the sediments of Lake Donghu, China.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Tian, Cuicui; Wang, Chunbo; Tian, Yingying; Wu, Xingqiang; Xiao, Bangding</p> <p>2015-08-01</p> <p>In lake sediments, iron (<span class="hlt">Fe</span>) is the most versatile element, and the redox cycling of <span class="hlt">Fe</span> has a wide influence on the biogeochemical cycling of organic and inorganic substances. The aim of the present study was to analyze the vertical distribution of <span class="hlt">Fe</span> and <span class="hlt">Fe</span>(III)-reducing bacteria (<span class="hlt">Fe</span>RB) in the surface sediment (30 cm) of Lake Donghu, China. At the 3 sites we surveyed, <span class="hlt">Fe</span>RB and <span class="hlt">Fe</span>(II)-oxidizing bacteria (<span class="hlt">Fe</span>OB) coexisted in anoxic sediments. Geobacter-related <span class="hlt">Fe</span>RB accounted for 5%-31% of the total Bacteria, while Gallionella-related <span class="hlt">Fe</span>OB accounted for only 0.1%-1.3%. A significant correlation between the relative abundance of poorly crystalline <span class="hlt">Fe</span> and Geobacter spp. suggested that poorly crystalline <span class="hlt">Fe</span> favored microbial <span class="hlt">Fe</span>(III) reduction. Poorly crystalline <span class="hlt">Fe</span> and Geobacter spp. were significantly associated with solid-phase <span class="hlt">Fe</span>(II) and total inorganic phosphorus levels. Pore water <span class="hlt">Fe</span>(II) concentrations negatively correlated with NO3(-) at all sites. We concluded that Geobacter spp. were abundant in the sediments of Lake Donghu, and the redox of <span class="hlt">Fe</span> might participate in the cycling of nitrogen and phosphorus in sediments. These observations provided insight into the roles of microbial <span class="hlt">Fe</span> cycling in lake sediments.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://pubs.er.usgs.gov/publication/70017813','USGSPUBS'); return false;" href="https://pubs.er.usgs.gov/publication/70017813"><span>Dissimilatory <span class="hlt">Fe</span>(III) reduction by the marine microorganism Desulfuromonas acetoxidans</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Roden, E.E.; Lovley, D.R.</p> <p>1993-01-01</p> <p>The ability of the marine microorganism Desulfuromonas acetoxidans to reduce <span class="hlt">Fe</span>(III) was investigated because of its close phylogenetic relationship with the freshwater dissimilatory <span class="hlt">Fe</span>(III) reducer Geobacter metallireducens. Washed cell suspensions of the type strain of D. acetoxidans reduced soluble <span class="hlt">Fe</span>(III)-citrate and <span class="hlt">Fe</span>(III) complexed with nitriloacetic acid. The c-type cytochrome(s) of D. acetoxidans was oxidized by <span class="hlt">Fe</span>(III)- citrate and Mn(IV)-oxalate, as well as by two electron acceptors known to support growth, colloidal sulfur and malate. D. acetoxidans grew in defined anoxic, bicarbonate-buffered medium with acetate as the sole electron donor and poorly crystalline <span class="hlt">Fe</span>(III) or Mn(IV) as the sole electron acceptor. Magnetite (<span class="hlt">Fe</span>3O4) and siderite (<span class="hlt">Fe</span>CO3) were the major end products of <span class="hlt">Fe</span>(III) reduction, whereas rhodochrosite (MnCO3) was the end product of Mn(IV) reduction. Ethanol, propanol, pyruvate, and butanol also served as electron donors for <span class="hlt">Fe</span>(III) reduction. In contrast to D. acetoxidans, G. metallireducens could only grow in freshwater medium and it did not conserve energy to support growth from colloidal S0 reduction. D. acetoxidans is the first marine microorganism shown to conserve energy to support growth by coupling the complete oxidation of organic compounds to the reduction of <span class="hlt">Fe</span>(III) or Mn(IV). Thus, D. acetoxidans provides a <span class="hlt">model</span> enzymatic mechanism for <span class="hlt">Fe</span>(III) or Mn(IV) oxidation of organic compounds in marine and estuarine sediments. These findings demonstrate that 16S rRNA phylogenetic analyses can suggest previously unrecognized metabolic capabilities of microorganisms.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2011AGUFM.B54D..07B','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2011AGUFM.B54D..07B"><span><span class="hlt">Fe</span> and Cu isotope mass balances in the human body</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Balter, V.; Albarede, F.; Jaouen, K.</p> <p>2011-12-01</p> <p>The ranges of the <span class="hlt">Fe</span> and Cu isotope compositions in the human body are large, i.e. ~3% and ~2%, respectively. Both isotopic fractionations appear to be mainly controlled by redox conditions. The <span class="hlt">Fe</span> and Cu isotope compositions of the tissues analyzed so far plot on a mixing hyperbolae between a reduced and an oxidized metals pools. The reduced metals pool is composed by erythrocytes, where <span class="hlt">Fe</span> is bounded to hemoglobin as <span class="hlt">Fe</span>(II) and Cu to superoxide-dismutase as Cu(I). The oxidized metals pool is composed by hepatocytes, where <span class="hlt">Fe</span> and Cu are stored as <span class="hlt">Fe</span>(III) ferritin and as Cu(II) ceruloplasmine, respectively. The position of each biological component in the δ56<span class="hlt">Fe</span>-δ65Cu diagram therefore reflects the oxidation state of <span class="hlt">Fe</span> and Cu of the predominant metal carrier protein and allows to quantify <span class="hlt">Fe</span> and Cu fluxes between organs using mass balance calculations. For instance, serum and clot <span class="hlt">Fe</span> and Cu isotope compositions show that current biological <span class="hlt">models</span> of erythropoiesis violates mass conservation requirements, and suggest hidden <span class="hlt">Fe</span> and Cu pathways during red blood cells synthesis. The results also show that a coupled <span class="hlt">Fe</span>-Cu strong gender isotopic effect is observed in various organs. The isotopic difference between men and women is unlikely to be due to differential dietary uptake or endometrium loss, but rather reflects the effect of menstrual losses and a correlative solicitation of hepatic stores. We speculate that thorough studies of the metabolism of stable isotopes in normal conditions is a prerequisite for the understanding of the pathological dysregulations.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://files.eric.ed.gov/fulltext/ED173205.pdf','ERIC'); return false;" href="http://files.eric.ed.gov/fulltext/ED173205.pdf"><span>Final Report for Dynamic <span class="hlt">Models</span> for Causal Analysis of Panel Data. <span class="hlt">Models</span> for Change in Quantitative Variables, <span class="hlt">Part</span> I Deterministic <span class="hlt">Models</span>. <span class="hlt">Part</span> II, Chapter 3.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Hannan, Michael T.</p> <p></p> <p>This document is <span class="hlt">part</span> of a series of chapters described in SO 011 759. Addressing the question of effective <span class="hlt">models</span> to measure change and the change process, the author suggests that linear structural equation systems may be viewed as steady state outcomes of continuous-change <span class="hlt">models</span> and have rich sociological grounding. Two interpretations of the…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/28514937','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/28514937"><span>Removal of dibutyl phthalate from aqueous environments using a nanophotocatalytic <span class="hlt">Fe</span>, Ag-ZnO/VIS-LED system: <span class="hlt">modeling</span> and optimization.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Akbari-Adergani, B; Saghi, M H; Eslami, A; Mohseni-Bandpei, A; Rabbani, M</p> <p>2018-06-01</p> <p>An (<span class="hlt">Fe</span>, Ag) co-doped ZnO nanostructure was synthesized by a simple chemical co-precipitation method and used for the degradation of dibutyl phthalate (DBP) in aqueous solution under visible light-emitting diode (LED) irradiation. (<span class="hlt">Fe</span>, Ag) co-doped ZnO nanorods were characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy, UV-VIS diffuse reflectance spectroscopy, elemental mapping, Field emission scanning electron microscopy, transmission electron microscope and Brunauer-Emmett-Teller surface area analysis. A Central Composite Design was used to optimize the reaction parameters for the removal of DBP by the (<span class="hlt">Fe</span>, Ag) co-doped ZnO nanorods. The four main reaction parameters optimized in this study were the following: pH, time of radiation, concentration of the nanorods and initial DBP concentration. The interaction between the four parameters was studied and <span class="hlt">modeled</span> using the Design Expert 10 software. A maximum reduction of 95% of DBP was achieved at a pH of 3, a photocatalyst concentration of 150 mg L -1 and a DBP initial DBP concentration of 15 mg L -1 . The results showed that the (<span class="hlt">Fe</span>, Ag) co-doped ZnO nanorods under low power LED irradiation can be used as an effective photocatalyst for the removal of DBP from aqueous solutions.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017SuTMP...5d5003T','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017SuTMP...5d5003T"><span>Characterization, <span class="hlt">modeling</span> and simulation of fused deposition <span class="hlt">modeling</span> fabricated <span class="hlt">part</span> surfaces</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Taufik, Mohammad; Jain, Prashant K.</p> <p>2017-12-01</p> <p>Surface roughness is generally used for characterization, <span class="hlt">modeling</span> and simulation of fused deposition <span class="hlt">modeling</span> (FDM) fabricated <span class="hlt">part</span> surfaces. But the average surface roughness is not able to provide the insight of surface characteristics with sharp peaks and deep valleys. It deals in the average sense for all types of surfaces, including FDM fabricated surfaces with distinct surface profile features. The present research work shows that kurtosis and skewness can be used for characterization, <span class="hlt">modeling</span> and simulation of FDM surfaces because these roughness parameters have the ability to characterize a surface with sharp peaks and deep valleys. It can be critical in certain application areas in tribology and biomedicine, where the surface profile plays an important role. Thus, in this study along with surface roughness, skewness and kurtosis are considered to show a novel strategy to provide new transferable knowledge about FDM fabricated <span class="hlt">part</span> surfaces. The results suggest that the surface roughness, skewness and kurtosis are significantly different at 0° and in the range (0°, 30°], [30°, 90°] of build orientation.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/2017AGUFMMR54A..07Z','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/2017AGUFMMR54A..07Z"><span>Stability of the high pressure phase <span class="hlt">Fe</span>3S2 up to Earth's core pressures in the <span class="hlt">Fe</span>-S-O and the <span class="hlt">Fe</span>-S-Si systems</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Zurkowski, C. C.; Chidester, B.; Davis, A.; Brauser, N.; Greenberg, E.; Prakapenka, V. B.; Campbell, A.</p> <p>2017-12-01</p> <p>Earth's core is comprised of an iron-nickel alloy that contains 5-15% of a light element component. The abundance and alloying capability of sulfur, silicon and oxygen in the bulk Earth make them important core alloy candidates; therefore, the high-pressure phase equilibria of the <span class="hlt">Fe</span>-S-O and <span class="hlt">Fe</span>-S-Si systems are relevant for understanding the possible chemistry of Earth's core. Previously, a <span class="hlt">Fe</span>3S2 phase was recognized as a low-pressure intermediate phase in the <span class="hlt">Fe-Fe</span>S system that is stable from 14-21 GPa, but the structure of this phase has not been resolved. We report in-situ XRD and chemical analysis of recovered samples to further examine the stability and structure of <span class="hlt">Fe</span>3S2 as it coexists with other phases in the <span class="hlt">Fe</span>-S-O and <span class="hlt">Fe</span>-S-Si systems. In situ high P-T synchrotron XRD experiments were conducted in the laser-heated diamond anvil cell to determine the equilibrium phases in <span class="hlt">Fe</span>75S7O18 and <span class="hlt">Fe</span>80S5Si15 compositions between 30 and 174 GPa and up to 3000 K. In the S,O-rich samples, an orthorhombic <span class="hlt">Fe</span>3S2 phase coexists with hcp-<span class="hlt">Fe</span>, <span class="hlt">Fe</span>3S and <span class="hlt">Fe</span>O and undergoes two monoclinic distortions between 60 and 174 GPa. In the S,Si-rich samples, the orthorhombic <span class="hlt">Fe</span>3S2 phase was observed up to 115 GPa. With increasing pressure, the <span class="hlt">Fe</span>3S2 phase becomes stable to higher temperatures in both compositions, suggesting possible <span class="hlt">Fe</span>3(S,O)2 or <span class="hlt">Fe</span>3(S,Si)2 solid solutions. SEM analysis of a laser heated <span class="hlt">Fe</span>75S7O18 sample recovered from 40 GPa and 1450 K confirms a <span class="hlt">Fe</span>3(S,O)2 phase with O dissolved into the structure. Based on the current melting data in the <span class="hlt">Fe</span>-S-O and <span class="hlt">Fe</span>-S-Si systems, the <span class="hlt">Fe</span>3(S,O)2 stability field intersects the solidus in the outer core and could be a possible liquidus phase in <span class="hlt">Fe</span>,S,O-rich planetary cores, whereas <span class="hlt">Fe</span>3S is the stable sulfide at outer core pressures in <span class="hlt">Fe</span>,S,Si-rich systems.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://pubs.er.usgs.gov/publication/70011106','USGSPUBS'); return false;" href="https://pubs.er.usgs.gov/publication/70011106"><span>Thermodynamics of <span class="hlt">Fe(II)Fe</span>(III) oxide systems I. Hydrothermal <span class="hlt">Fe</span>3O4</span></a></p> <p><a target="_blank" href="http://pubs.er.usgs.gov/pubs/index.jsp?view=adv">USGS Publications Warehouse</a></p> <p>Bartel, J.J.; Westrum, E.F.; Haas, J.L.</p> <p>1976-01-01</p> <p>The heat capacity of a hydrothermally-prepared polycrystalline sample of <span class="hlt">Fe</span>3O4 was measured from 53 to 350 K, primarily to study the thermophysics of the Verwey transitions. Although the bifurcation of the transition was confirmed, the sample was found to contain traces of manganese. The observed transition temperatures of 117.0 and 123.0 K are 3.7 and 4.2 K higher respectively than those found in pure <span class="hlt">Fe</span>3O4. Ancillary analytical results are consistent and indicate a stoichiometry of Mn0.008<span class="hlt">Fe</span>2.992O4 for this material. Characteristics in the transition region are ascribed to dopant effects. ?? 1976.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4070099','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=4070099"><span>A broad survey reveals substitution tolerance of residues ligating <span class="hlt">Fe</span>S clusters in [Ni<span class="hlt">Fe</span>] hydrogenase</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p></p> <p>2014-01-01</p> <p>Background In order to understand the effects of <span class="hlt">Fe</span>S cluster attachment in [Ni<span class="hlt">Fe</span>] hydrogenase, we undertook a study to substitute all 12 amino acid positions normally ligating the three <span class="hlt">Fe</span>S clusters in the hydrogenase small subunit. Using the hydrogenase from Alteromonas macleodii “deep ecotype” as a <span class="hlt">model</span>, we substituted one of four amino acids (Asp, His, Asn, Gln) at each of the 12 ligating positions because these amino acids are alternative coordinating residues in otherwise conserved-cysteine positions found in a broad survey of Ni<span class="hlt">Fe</span> hydrogenase sequences. We also hoped to discover an enzyme with elevated hydrogen evolution activity relative to a previously reported “G1” (H230C/P285C) improved enzyme in which the medial <span class="hlt">Fe</span>S cluster Pro and the distal <span class="hlt">Fe</span>S cluster His were each substituted for Cys. Results Among all the substitutions screened, aspartic acid substitutions were generally well-tolerated, and examination suggests that the observed deficiency in enzyme activity may be largely due to misprocessing of the small subunit of the enzyme. Alignment of hydrogenase sequences from sequence databases revealed many rare substitutions; the five substitutions present in databases that we tested all exhibited measurable hydrogen evolution activity. Select substitutions were purified and tested, supporting the results of the screening assay. Analysis of these results confirms the importance of small subunit processing. Normalizing activity to quantity of mature small subunit, indicative of total enzyme maturation, weakly suggests an improvement over the “G1” enzyme. Conclusions We have comprehensively screened 48 amino acid substitutions of the hydrogenase from A. macleodii “deep ecotype”, to understand non-canonical ligations of amino acids to <span class="hlt">Fe</span>S clusters and to improve hydrogen evolution activity of this class of hydrogenase. Our studies show that non-canonical ligations can be functional and also suggests a new limiting factor in the production of</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/22846645','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/22846645"><span>γ-<span class="hlt">Fe</span>2O3 and <span class="hlt">Fe</span>3O4 magnetic hierarchically nanostructured hollow microspheres: preparation, formation mechanism, magnetic property, and application in water treatment.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Xu, Jing-San; Zhu, Ying-Jie</p> <p>2012-11-01</p> <p>In this paper, we report the preparation of γ-<span class="hlt">Fe</span>(2)O(3) and <span class="hlt">Fe</span>(3)O(4) magnetic hierarchically nanostructured hollow microspheres by a solvothermal combined with precursor thermal conversion method. These γ-<span class="hlt">Fe</span>(2)O(3) and <span class="hlt">Fe</span>(3)O(4) magnetic hierarchically nanostructured hollow microspheres were constructed by three-dimensional self-assembly of nanosheets, forming porous nanostructures. The effects of experimental parameters including molar ratio of reactants and reaction temperature on the precursors were studied. The time-dependent experiments indicated that the Ostwald ripening was responsible for the formation of the hierarchically nanostructured hollow microspheres of the precursors. γ-<span class="hlt">Fe</span>(2)O(3) and <span class="hlt">Fe</span>(3)O(4) magnetic hierarchically nanostructured hollow microspheres were obtained by the thermal transformation of the precursor hollow microspheres. Both γ-<span class="hlt">Fe</span>(2)O(3) and <span class="hlt">Fe</span>(3)O(4) hierarchically nanostructured hollow microspheres exhibited a superparamagnetic property at room temperature and had the saturation magnetization of 44.2 and 55.4 emu/g, respectively, in the applied magnetic field of 20 KOe. Several kinds of organic pollutants including salicylic acid (SA), methylene blue (MB), and basic fuchsin (BF) were chosen as the <span class="hlt">model</span> water pollutants to evaluate the removal abilities of γ-<span class="hlt">Fe</span>(2)O(3) and <span class="hlt">Fe</span>(3)O(4) magnetic hierarchically nanostructured hollow microspheres. It was found that γ-<span class="hlt">Fe</span>(2)O(3) hierarchically nanostructured hollow microspheres showed a better adsorption ability over SA than MB and BF. However, <span class="hlt">Fe</span>(3)O(4) hierarchically nanostructured hollow microspheres had the best performance for adsorbing MB. Copyright © 2012 Elsevier Inc. All rights reserved.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('http://adsabs.harvard.edu/abs/1995JMMM..140..545H','NASAADS'); return false;" href="http://adsabs.harvard.edu/abs/1995JMMM..140..545H"><span>MBE growth and FMR, BLS and MOKE studies of exchange coupling in <span class="hlt">Fe</span> whisker/Cr/<span class="hlt">Fe</span>(001) and in <span class="hlt">Fe/Cu/Fe</span>(001) 'loose spin' structures</span></a></p> <p><a target="_blank" href="http://adsabs.harvard.edu/abstract_service.html">NASA Astrophysics Data System (ADS)</a></p> <p>Heinrich, B.; From, M.; Cochran, J. F.; Kowalewski, M.; Atlan, D.; Celinski, Z.; Myrtle, K.</p> <p>1995-02-01</p> <p>The exchange coupling has been studied in structures which consist of two ferromagnetic layers separated by non-ferromagnetic spacers (trilayers). The exchange coupling was measured using FMR and BLS techniques in the temperature range 77-400 K. Two systems were investigated: (a) <span class="hlt">Fe</span> whisker/Cr/<span class="hlt">Fe</span>(001) and (b) <span class="hlt">Fe/Cr/Fe</span>(001). The oscillatory thickness dependence of the exchange coupling through a spin-density wave Cr spacer will be discussed and compared with recent data obtained by other groups. Cu interlayers were deposited either in a pure form, or a single monolayer of {Cu}/{<span class="hlt">Fe</span>} alloy ('loose spins') was inserted between two pure bcc Cu(001) layers. Several such 'loose spin' structures were engineered to test the behavior of 'loose spin' structures. It was found that the presence of <span class="hlt">Fe</span> impurity atoms has a strong tendency to decrease the direct bilinear exchange coupling. The contribution of 'loose spins' to the exchange coupling can be made significant, and even dominant, by a suitable choice of the RKKY coupling energy between the 'loose spins' and the surrounding ferromagnetic layers.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5601415','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=5601415"><span>Insights into Resistance to <span class="hlt">Fe</span> Deficiency Stress from a Comparative Study of In Vitro-Selected Novel <span class="hlt">Fe</span>-Efficient and <span class="hlt">Fe</span>-Inefficient Potato Plants</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Boamponsem, Georgina A.; Leung, David W. M.; Lister, Carolyn</p> <p>2017-01-01</p> <p>Iron (<span class="hlt">Fe</span>) deficiency induces chlorosis (IDC) in plants and can result in reduced plant productivity. Therefore, development of <span class="hlt">Fe</span>-efficient plants is of great interest. To gain a better understanding of the physiology of <span class="hlt">Fe</span>-efficient plants, putative novel plant variants were regenerated from potato (Solanum tubersosum L. var. ‘Iwa’) callus cultures selected under <span class="hlt">Fe</span> deficient or low <span class="hlt">Fe</span> supply (0–5 μM <span class="hlt">Fe</span>). Based on visual chlorosis rating (VCR), 23% of callus-derived regenerants were classified as <span class="hlt">Fe</span>-efficient (EF) and 77% as <span class="hlt">Fe</span>-inefficient (IFN) plant lines when they were grown under <span class="hlt">Fe</span> deficiency conditions. Stem height was found to be highly correlated with internodal distance, leaf and root lengths in the EF plant lines grown under <span class="hlt">Fe</span> deficiency conditions. In addition, compared to the IFN plant lines and control parental biotype, the EF plants including the lines named A1, B2, and B9, exhibited enhanced formation of lateral roots and root hairs as well as increased expression of ferritin (fer3) in the leaf and iron-regulated transporter (irt1) in the root. These morphological adaptations and changes in expression the fer3 and irt1 genes of the selected EF potato lines suggest that they are associated with resistance to low <span class="hlt">Fe</span> supply stress. PMID:28955367</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/12691553','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/12691553"><span>Requirements for functional <span class="hlt">models</span> of the iron hydrogenase active site: D2/H2O exchange activity in ((mu-SMe)(mu-pdt)[<span class="hlt">Fe</span>(CO)2(PMe3)]2+)[BF4-].</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Georgakaki, Irene P; Miller, Matthew L; Darensbourg, Marcetta Y</p> <p>2003-04-21</p> <p>Hydrogen uptake in hydrogenase enzymes can be assayed by H/D exchange reactivity in H(2)/D(2)O or H(2)/D(2)/H(2)O mixtures. Diiron(I) complexes that serve as structural <span class="hlt">models</span> for the active site of iron hydrogenase are not active in such isotope scrambling but serve as precursors to <span class="hlt">Fe(II)Fe</span>(II) complexes that are functional <span class="hlt">models</span> of [<span class="hlt">Fe</span>]H(2)ase. Using the same experimental protocol as used previously for ((mu-H)(mu-pdt)[<span class="hlt">Fe</span>(CO)(2)(PMe(3))](2)(+)), 1-H(+) (Zhao et al. J. Am. Chem. Soc. 2001, 123, 9710), we now report the results of studies of ((mu-SMe)(mu-pdt)[<span class="hlt">Fe</span>(CO)(2)(PMe(3))](2)(+)), 1-SMe(+), toward H/D exchange. The 1-SMe(+) complex can take up H(2) and catalyze the H/D exchange reaction in D(2)/H(2)O mixtures under photolytic, CO-loss conditions. Unlike 1-H(+), it does not catalyze H(2)/D(2) scrambling under anhydrous conditions. The molecular structure of 1-SMe(+) involves an elongated <span class="hlt">Fe.Fe</span> separation, 3.11 A, relative to 2.58 A in 1-H(+). It is proposed that the strong SMe(-) bridging ligand results in catalytic activity localized on a single <span class="hlt">Fe</span>(II) center, a scenario that is also a prominent possibility for the enzyme active site. The single requirement is an open site on <span class="hlt">Fe</span>(II) available for binding of D(2) (or H(2)), followed by deprotonation by the external base H(2)O (or D(2)O).</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.ncbi.nlm.nih.gov/pubmed/19771373','PUBMED'); return false;" href="https://www.ncbi.nlm.nih.gov/pubmed/19771373"><span>Structural, thermal and photomagnetic properties of spin crossover [<span class="hlt">Fe</span>(bpp)2]2+ salts bearing [Cr(L)(ox)2]- anions.</span></a></p> <p><a target="_blank" href="https://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pubmed">PubMed</a></p> <p>Clemente-León, Miguel; Coronado, Eugenio; Giménez-López, M Carmen; Romero, Francisco M; Asthana, Saket; Desplanches, Cédric; Létard, Jean-François</p> <p>2009-10-14</p> <p>This paper is divided into two <span class="hlt">parts</span>: in the first <span class="hlt">part</span>, the influence of solvate molecules on the magnetic properties of spin crossover salts of [<span class="hlt">Fe</span>(bpp)(2)][Cr(L)(ox)(2)]ClO(4) x nS (bpp = 2,6-bis(pyrazol-3yl)pyridine; L = 2,2'-bipyridine (bpy) or 1,10-phenanthroline (phen); ox = oxalate dianion; S = solvent) is analyzed. The second <span class="hlt">part</span> is devoted to the photomagnetic properties of the previously reported [<span class="hlt">Fe</span>(bpp)(2)][Cr(L)(ox)(2)](2) family of compounds. The study describes the crystal structure, differential scanning calorimetry (DSC) and magnetic properties of [<span class="hlt">Fe</span>(bpp)(2)][Cr(bpy)(ox)(2)]ClO(4) x EtOH x 4 H(2)O (1) and [<span class="hlt">Fe</span>(bpp)(2)][Cr(phen)(ox)(2)]ClO(4) x 1.5 EtOH x 4 H(2)O (2). Both salts are high-spin (HS) compounds. Desolvation of 1 yields a material exhibiting a gradual spin crossover that involves 50% of the <span class="hlt">Fe</span>(2+) cations. Rehydration of this desolvated salt induces a significant increase in the low-spin (LS) population. Desolvation of 2 affords a material showing a more abrupt spin crossover with thermal hysteresis (T(1/2)(increasing) = 286 K and T(1/2)(decreasing) = 273 K). This material is not very sensitive to rehydration. The anhydrous compounds [<span class="hlt">Fe</span>(bpp)(2)][Cr(bpy)(ox)(2)](2) (3) and [<span class="hlt">Fe</span>(bpp)(2)][Cr(phen)(ox)(2)](2) (4) display some quantitative photomagnetic conversion with T(LIESST) values of 41 and 51 K, respectively. Kinetic parameters governing the photo-induced HS-LS relaxation process have been determined and used to reproduce the T(LIESST) curves.</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=390611','PMC'); return false;" href="https://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=390611"><span>[4<span class="hlt">Fe</span>-4S]-cluster-depleted Azotobacter vinelandii ferredoxin I: a new 3<span class="hlt">Fe</span> iron-sulfur protein.</span></a></p> <p><a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?DB=pmc">PubMed Central</a></p> <p>Stephens, P J; Morgan, T V; Devlin, F; Penner-Hahn, J E; Hodgson, K O; Scott, R A; Stout, C D; Burgess, B K</p> <p>1985-01-01</p> <p><span class="hlt">Fe</span>(CN)6(-3) oxidation of the aerobically isolated 7<span class="hlt">Fe</span> Azotobacter vinelandii ferredoxin I, (7<span class="hlt">Fe</span>)FdI, is a degradative reaction. Destruction of the [4<span class="hlt">Fe</span>-4S] cluster occurs first, followed by destruction of the [3<span class="hlt">Fe</span>-3S] cluster. At a <span class="hlt">Fe</span>(CN)6(-3)/(7<span class="hlt">Fe</span>)FdI concentration ratio of 20, the product is a mixture of apoprotein and protein containing only a [3<span class="hlt">Fe</span>-3S] cluster, (3<span class="hlt">Fe</span>)FdI. This protein mixture, after partial purification, has been characterized by absorption, CD, magnetic CD, and EPR and <span class="hlt">Fe</span> x-ray absorption spectroscopies. EPR and magnetic CD spectra provide strong evidence that the [3<span class="hlt">Fe</span>-3S] cluster in (3<span class="hlt">Fe</span>)FdI is essentially identical in structure to that in (7<span class="hlt">Fe</span>)FdI. Analysis of the extended x-ray absorption fine structure (EXAFS) of (3<span class="hlt">Fe</span>)FdI finds <span class="hlt">Fe</span> scattering at an average <span class="hlt">Fe...Fe</span> distance of approximately equal to 2.7 A. The structure of the oxidized [3<span class="hlt">Fe</span>-3S] cluster in solutions of oxidized (3<span class="hlt">Fe</span>)FdI, and, by extension, of oxidized (7<span class="hlt">Fe</span>)FdI, is thus different from that obtained by x-ray crystallography on oxidized (7<span class="hlt">Fe</span>)FdI. Possible interpretations of this result are discussed. PMID:2994040</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://eric.ed.gov/?q=programming+AND+flowchart&pg=3&id=ED348073','ERIC'); return false;" href="https://eric.ed.gov/?q=programming+AND+flowchart&pg=3&id=ED348073"><span>Santa <span class="hlt">Fe</span> Community College Staff Development Programs, Policies and Procedures.</span></a></p> <p><a target="_blank" href="http://www.eric.ed.gov/ERICWebPortal/search/extended.jsp?_pageLabel=advanced">ERIC Educational Resources Information Center</a></p> <p>Santa Fe Community Coll., NM.</p> <p></p> <p>This collection of materials describes various aspects of Santa <span class="hlt">Fe</span> Community College's (SFCC's) faculty and staff development program. <span class="hlt">Part</span> 1 explains the philosophy that underpins staff development at SFCC; the planning, programming, information dissemination, and evaluation phases of staff development; and the use of professional development…</p> </li> <li> <p><a target="_blank" onclick="trackOutboundLink('https://www.gpo.gov/fdsys/pkg/CFR-2014-title46-vol5/pdf/CFR-2014-title46-vol5-part150-app1.pdf','CFR2014'); return false;" href="https://www.gpo.gov/fdsys/pkg/CFR-2014-title46-vol5/pdf/CFR-2014-title46-vol5-part150-app1.pdf"><span>46 CFR Figure 1 to <span class="hlt">Part</span> 150 - Compatibility Chart</span></a></p> <p><a target="_blank" href="http://www.gpo.gov/fdsys/browse/collectionCfr.action?selectedYearFrom=2014&page.go=Go">Code of Federal Regulations, 2014 CFR</a></p> <p></p> <p>2014-10-01</p> <p>... 46 Shipping 5 2014-10-01 2014-10-01 false Compatibility Chart 1 Figure 1 to <span class="hlt">Part</span> 150 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) CERTAIN BULK DANGEROUS CARGOES COMPATIBILITY OF CARGOES Pt. 150, Fig. 1 Figure 1 to <span class="hlt">Part</span> 150—Compatibility Chart EC02<span class="hlt">FE</span>91.079 ...</p> </li> </ol> <div class="pull-right"> <ul class="pagination"> <li><a href="#" onclick='return showDiv("page_1");'>«</a></li> <li><a href="#" onclick='return showDiv("page_21");'>21</a></li> <li><a href="#" onclick='return showDiv("page_22");'>22</a></li> <li><a href="#" onclick='return showDiv("page_23");'>23</a></li> <li><a href="#" onclick='return showDiv("page_24");'>24</a></li> <li class="active"><span>25</span></li> <li><a href="#" onclick='return showDiv("page_25");'>»</a></li> </ul> </div> </div><!-- col-sm-12 --> </div><!-- row --> </div><!-- page_25 --> <div class="footer-extlink text-muted" style="margin-bottom:1rem; text-align:center;">Some links on this page may take you to non-federal websites. 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