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Sample records for raamat ajast mil

  1. Comparative study of hydrogen sulfide adsorption in the MIL-53(Al, Cr, Fe), MIL-47(V), MIL-100(Cr), and MIL-101(Cr) metal-organic frameworks at room temperature.

    PubMed

    Hamon, Lomig; Serre, Christian; Devic, Thomas; Loiseau, Thierry; Millange, Franck; Férey, Gérard; De Weireld, Guy

    2009-07-01

    Hydrogen sulfide gravimetric isotherm adsorption measurements were carried out on MIL-53(Al, Cr, Fe), MIL-47(V), MIL-100(Cr), and MIL-101(Cr) metal-organic frameworks (MOFs). A two-step adsorption mechanism related to a breathing effect was observed for MIL-53 terephthalate-based MOFs. Methane adsorption measurements highlighted the regenerability of MIL-53(Al, Cr) and MIL-47(V) MOFs after H(2)S treatment, whereas MIL-100 and MIL-101 CH(4) adsorption capacities were significantly decreased. PMID:19505146

  2. Mils for HCC: the state of art.

    PubMed

    Belli, Andrea; Fantini, Corrado; Cioffi, Luigi; D'Agostino, Alberto; Belli, Giulio

    2015-06-01

    After an initial skepticism, minimally invasive liver surgery (MILS) gained popularity and is nowadays a consolidated option in specialized centers for the surgical treatment of selected patients affected by both benign and malignant liver diseases. Nevertheless, the role of MILS in the surgical treatment of hepato-cellular carcinoma (HCC) developed on the background of chronic liver disease is still a matter of debate. The indications and the current evidences on MILS for HCC are discussed in this paper. MILS being less invasive and harmful for the patients proved to offer a reduction in post-operative morbidity and specific benefits have been highlighted in case of patients affected by HCC and chronic liver disease. In fact, by minimizing liver manipulation and mobilization and by preserving the collateral blood and lymphatic flow, MILS seems to reduce the incidence of post-operative ascites and post-operative liver failure without compromising the oncologic outcomes. This has been confirmed by an analysis of 21 comparative studies and 5 metanalyses comparing MILS and open surgery for HCC. With an adequate surgical training, MILS for HCC can be undertaken safely even in case of major hepatectomies and technically demanding operations such as resections of posteriorly located tumors proved to be feasible in specialized centers. Therefore, with an appropriate patients' selection, MILS for HCC is becoming the preferred option for the surgical treatment of HCC in cirrhotic patients. PMID:26164139

  3. MIL-STD-1553B validation testing

    NASA Astrophysics Data System (ADS)

    Thorpe, D. J.; Vakkalanka, K. V.

    1982-11-01

    One of the major responsibilities of the Systems Engineering Avionics Facility (SEAFAC) is to act as the Air Force Office of Primary Responsibility (OPR) for MIL-STD-1553 applications. Since its inception in 1974, this organization played a vital role in promoting and enforcing the standard. In the area testing, SEAFAC set the pace by developing the Test Plan and specialized test equipment. Our advanced validation test facility allows us to test a wide variety of MIL-STD-1553B interfaces, such as Remote Terminals, transceivers and, of particular interest, the Large Scale Integrated circuit chips, to ensure their conformity to MIL-STD-1553B. This paper outlines our present validation testing as well as planned automation of our test facility. A summary of our experiences is presented. The paper concludes with SEAFAC's role in future testing.

  4. MIL-STD-1553 interface application notes

    NASA Astrophysics Data System (ADS)

    Friedman, S. N.

    1982-11-01

    This paper describes Monolithic and Hybrid circuits used for interfacing to a MIL-STD-1553 Multiplex Data Bus. The focus in on how to implement smart and dumb remote terminals with existing devices. A menu table depicting product selection has also been provided. The implementation of Bus Controller (BC), Monitor and Remote Terminal Unit (RTU) interfaces, will be fully described using standard off the shelf products. Buffered Memory Interface, will complete the picture of the implementation of MIL-STD-1553 A or B. The MCE (Smith) LSI Chip Set for MIL-STD-1553B RTU and BC configurations will be described. Additional application topics covered will be the implementation of high speed data transfer circuitry, single, dual and quad redundant channel operation as well as implementing external status word controls. A summary of product sizes and power requirements associated with Bus Controller, RTU and Monitor applications will be provided.

  5. Incorporation of metallocenes into the channel structured Metal-Organic Frameworks MIL-53(Al) and MIL-47(V).

    PubMed

    Meilikhov, Mikhail; Yusenko, Kirill; Fischer, Roland A

    2010-12-01

    A selection of metallocene inclusion compounds with channel structured MOFs (MOF = Metal-Organic Framework) were obtained via solvent-fee adsorption of the metallocenes from the gas-phase. The adsorbate structures ferrocene(0.5)@MIL-53(Al) (MIL-53(Al) = [Al(OH)(bdc)](n) with bdc = 1,4-terephthalate), ferrocene(0.25)@MIL-47(V) (MIL-47(V) = [V(O)(bdc)](n)), cobaltocene(0.25)@MIL-53(Al), cobaltocene(0.5)@MIL-47(V), 1-formylferrocene(0.33)@MIL-53(Al), 1,1'dimethylferrocene(0.33)@MIL-53(Al), 1,1'-diformylferrocene(0.5)@MIL-53(Al) were determined from powder X-ray diffraction data and were analyzed concerning the packing and orientation of the guest species. The packing of the ferrocene guest molecules inside MIL-47(V) is significantly different compared to MIL-53(Al) due to the lower breathing effect and weaker hydrogen bonds between the guest molecules and the host network in the case of MIL-47(V). The orientation of the metallocene molecule is also influenced by the substituents (CH(3) and CHO) at the cyclopentadienyl ring and the interaction with the bridging OH group of MIL-53(Al). The inclusion of redox active cobaltocene into MIL-47(V) leads to the formation of a charge transfer compound with a negatively charged framework. The reduction of the vanadium centers is stoichiometric. The resulting material is a mixed valence compound with a V(3+)/V(4+) ratio of 1:1. The new compounds were characterized via thermal gravimetric analysis, infrared spectroscopy, solid state NMR, and differential pulse voltammetry. Both systems are 1D-channel pore structures. The metallocene adsorbate induced breathing effect of MIL-53(Al) is more pronounced compared to MIL-47(V), this can be explained by the different bridging groups between the MO(6) clusters. PMID:20959920

  6. 1 mil gold bond wire study.

    SciTech Connect

    Huff, Johnathon; McLean, Michael B.; Jenkins, Mark W.; Rutherford, Brian Milne

    2013-05-01

    In microcircuit fabrication, the diameter and length of a bond wire have been shown to both affect the current versus fusing time ratio of a bond wire as well as the gap length of the fused wire. This study investigated the impact of current level on the time-to-open and gap length of 1 mil by 60 mil gold bond wires. During the experiments, constant current was provided for a control set of bond wires for 250ms, 410ms and until the wire fused; non-destructively pull-tested wires for 250ms; and notched wires. The key findings were that as the current increases, the gap length increases and 73% of the bond wires will fuse at 1.8A, and 100% of the wires fuse at 1.9A within 60ms. Due to the limited scope of experiments and limited data analyzed, further investigation is encouraged to confirm these observations.

  7. Metrication of MIL-HDBK-5C

    NASA Astrophysics Data System (ADS)

    Ruff, P. E.

    1980-08-01

    The objective of this program was to develop a 'soft' metric MIL-HDBK-5 Handbook based upon the conversion of existing United States (U.S.) units to the metric system of measurement and to publish the metric version of MIL-HDBK-5 as an Air Force technical report. The approach was to convert existing MIL-HDBK-5 to the metric system by changing all U.S. units of measurement to equivalent metric units. As required by Reference (1), the metric system used was The International System of Units (SI). In making the metric conversion, the conversion factors listed in Reference (2) were utilized. In general, the rules for conversion and rounding delineated in Reference (2) were observed. However, some exceptions to these rules were taken. The Handbook contains two digit and three digit design values in Ksi units with two and three significant figures, respectively. In the conversion, some arbitrary decisions were made for practical reasons. For most mill products, the design values vary with thickness. Consequently, the room temperature design allowable property tables list design values according to thickness ranges.

  8. Late Bombardment of the Lunar Highlands Recorded in MIL 090034, MIL 090036 and MIL 090070 Lunar Meteorites

    NASA Technical Reports Server (NTRS)

    Park, J.; Nyquist, L. E.; Shih, C.-Y.; Herzog, G. F.; Yamaguchi, A.; Shirai, N.; Ebihara, M.; Lindsay, F. N.; Delaney, J.; Turrin, B.; Swisher, C., III

    2013-01-01

    The Kaguya mission detected small but widespread outcrops of nearly pure ferroan anorthosite in and around large impact basins on the Moon. Along with certain lunar rocks, highly feldspathic lunar meteorites such as MIL 090034 (M34), 090036 (M36), and 090070 (M70) may provide samples of this material. We have measured the Ar-40/Ar-39 release patterns and cosmogenic Ar-38 concentrations of several small (<200 microg) samples separated from M34,36, and 70. From petrographic observations concluded that "some of the clasts and grains experienced generations of modifications," a conclusion that we examine in light of our data.

  9. MIL-STD-1553 VLSI components

    NASA Astrophysics Data System (ADS)

    Friedman, Steven N.

    The performance, physical and electrical characteristics of novel VLSI components which will support all MIL-STD-1553 terminals are described. A transceiver, protocol, and computer interface set of chips supports remote terminal unit, bus controller, and bus monitor modes of operation. A discussion of these VLSI components is given, and their special features are explored. These features include size and packaging options, radiation hardness, power, and reliability considerations. The special capabilities of these devices are highlighted, along with programming options that facilitate a broad array of applications.

  10. DSREDS/EDCARS MIL-STD-1840A review

    SciTech Connect

    Not Available

    1989-08-15

    This report presents a review of the Oklahoma City Air Logistics Center (OC-ALC) EDCARS system to determine the technical feasibility and options available for DSREDS/EDCARS Systems to support the interchange of raster based technical information in accordance with MIL-STD-1840A and MIL-R-28002 type I. The import capability supports receipt of ANSI labeled tapes in accordance with MIL-STD-1840A and conversion of the MIL-R-28002 format (standard CCITT Group 4 compressed files) to DSREDS/EDCARS compatible files (Wraparound compressed files). Results of the review indicate that interchange and import of technical information in accordance with MIL-STD-1840A and MIL-R-28002 can be economically accomplished utilizing one of three basic options: implementation of MIL-STD-1840A and CCITT Group 4/Wraparound programs on the EDCARS mainframe; implementation of MIL-STD-1840A and CCITT Group 4/Wraparound conversion platform connected to the EDCARS mainframe; and implementation of a MIL-STD-1840A and EDCARS Tape Import/Export conversion platform. Implementation estimates for the labor associated with the three options range from four to six engineer-months. Some of the options have additional hardware costs as described in section 6.

  11. Tailored particle distributions derived from MIL-STD-1246

    NASA Astrophysics Data System (ADS)

    Peterson, Ronald V.; Magallanes, Philip G.; Rock, David F.

    2002-09-01

    The use of MIL-STD-1246 particle distributions for calculating BRDF scatter has given unrealistic cleanliness requirements for optical systems exposed to environmental fallout. MIL-STD-1246 and fallout data were reviewed and used to generate more realistic particle distributions for use in BRDF scatter predictions.

  12. Mineralogy and Petrology of New Antarctic Nakhlite MIL 03346

    NASA Technical Reports Server (NTRS)

    McKay, G.; Schwandt, C.

    2005-01-01

    Among the approx.1300 meteorites returned from Antarctica by the 2003-2004 ANSMET expedition was a 715g nakhlite, MIL 03346, recovered from the Miller Range. Samples of this meteorite were distributed to investigators on December 16, 2004. We were allocated PTS MIL 03346,63,100. This abstract is our preliminary report on the mineralogy and petrology of this important new sample.

  13. The removal of bisphenol A from aqueous solutions by MIL-53(Al) and mesostructured MIL-53(Al).

    PubMed

    Zhou, Meimei; Wu, Yi-Nan; Qiao, Junlian; Zhang, Jing; McDonald, Amanda; Li, Guangtao; Li, Fengting

    2013-09-01

    In this work, metal-organic framework MIL-53(Al){Al(OH)[O2C-C6H4-CO2]} and MIL-53(Al)-F127{Al(OH)[O2C-C6H4-CO2]} were synthesized and used as sorbents to remove bisphenol A (BPA) from aqueous system. The sorption kinetics data of BPA were found to be in agreement with the pseudo-second-order model. The equilibrium sorption amounts of BPA on MIL-53(Al) and MIL-53(Al)-F127 reached 329.2±16.5 and 472.7±23.6 mg g(-1), respectively, far more than that of commercial activated carbons (ranging from 129.6 to 263.1 mg g(-1)). Both MIL-53(Al) and MIL-53(Al)-F127 could remove BPA fast from aqueous solutions, and the required contact time to reach equilibrium was approximately 90 min for MIL-53(Al) and 30 min for MIL-53(Al)-F127, respectively. The optimum pH levels for the removal of BPA using MIL-53 (Al) and MIL-53(Al)-F127 were 4 and 6 separately. The optimum temperature for the sorption behavior of BPA on the two sorbents was 20 °C. The results performed show that the resulting products, as one kind of MOFs, can be regarded as a new class of sorbents for water treatment and could find great applications in the fields of environmental water pollution control and resources reuse. PMID:23764233

  14. MIL-STD-1553 multiplex applications handbook. Addendum: Chapter 11

    NASA Astrophysics Data System (ADS)

    1983-03-01

    This document contains data words and message formats to be used for MIL-STD-1553 data bust applications. This document is intended as a guide for military & private sector designers to identify standard data words and messages for use in future avionics systems and subsystems. This report is to be Chapter 11 in the existing MIL-STD-1553 Multiplex Applications handbook which the Defense Materials Standards and Specifications Office (DMSSO) plans for publications as a Military Handbook on MIL-STD-1553.

  15. MIL-STD-1553: Testing and test equipment

    NASA Astrophysics Data System (ADS)

    Earhart, L.

    1982-11-01

    In the last few years there has been significant increase in the application of MIL-STD-1553. This has generated the need for better understanding of all apsects of testing multiplex hardware and systems. This paper begins with a brief discussion of the philosophy of testing. It highlights the compromise involved in end-item testing. The various phases of the test requirements are necessary to verify compliance with MIL-STD-1553B. The functional requirements of special purpose test equipment for multiplex hardware are described. The paper ends with an overview of commercially available MIL-STD-1553 test equipment.

  16. Application tables for MIL-STD-461B

    NASA Astrophysics Data System (ADS)

    Schulz, R. B.

    1982-02-01

    The complexity in application of MIL-STD-461B is reduced by use of tables which summarize requirements of the standard. A separate table is provided for a group of limits applicable to each type of test procedure.

  17. MEMS and mil/aero: technology push and market pull

    NASA Astrophysics Data System (ADS)

    Clifford, Thomas H.

    2001-04-01

    MEMS offers attractive solutions to high-density fluidics, inertial, optical, switching and other demanding military/aerospace (mil/aero) challenges. However, full acceptance must confront the realities of production-scale producibility, verifiability, testability, survivability, as well as long-term reliability. Data on these `..ilities' are crucial, and are central in funding and deployment decisions. Similarly, mil/aero users must highlight specific missions, environmental exposures, and procurement issues, as well as the quirks of its designers. These issues are particularly challenging in MEMS, because of the laws of physics and business economics, as well as the risks of deploying leading-edge technology into no-fail applications. This paper highlights mil/aero requirements, and suggests reliability/qualification protocols, to guide development effort and to reassure mil/aero users that MEMS labs are mindful of the necessary realities.

  18. Experiences in validating MIL-STD-1553 remote terminals

    NASA Astrophysics Data System (ADS)

    Earhart, Leroy

    Validation testing intended to verify the compliance of a terminal's interface with MIL-STD-1553 is reviewed focusing on misconceptions people might have about it, examples of remote terminal failures, and options available for validation testing. It is concluded that neglecting validation testing for an interface as complex as MIL-STD-1553 can be a costly mistake as the performance of a 1553 interface cannot be properly determined without it.

  19. Selective adsorption and separation of ortho-substituted alkylaromatics with the microporous aluminum terephthalate MIL-53.

    PubMed

    Alaerts, Luc; Maes, Michael; Giebeler, Lars; Jacobs, Pierre A; Martens, Johan A; Denayer, Joeri F M; Kirschhock, Christine E A; De Vos, Dirk E

    2008-10-29

    The metal-organic framework MIL-53(Al) was tested for selective adsorption and separation of xylenes and ethylbenzene, ethyltoluenes, and cymenes using batch, pulse chromatographic, and breakthrough experiments. In all conditions tested, MIL-53 has the largest affinity for the ortho-isomer among each group of alkylaromatic compounds. Separations of the ortho-compounds from the other isomers can be realized using a column packed with MIL-53 crystallites. As evidenced by Rietveld refinements, specific interactions of the xylenes with the pore walls of MIL-53 determine selectivity. In comparison with the structurally similar metal-organic framework MIL-47, the selectivities among alkylaromatics found for MIL-53 are different. Separation of ethyltoluene and cymene isomers is more effective on MIL-53 than on MIL-47; the pores of MIL-53 seem to be a more suitable environment for hosting the larger ethyltoluene and cymene isomers than those of MIL-47. PMID:18826226

  20. Feldspathic Meteorites MIL 090034 and 090070: Late Additions to the Lunar Crust

    NASA Technical Reports Server (NTRS)

    Nyquist, L. E.; Shirai, N.; Yamaguchi, A.; Shih, C.-Y.; Park, J.; Ebihara, M.

    2016-01-01

    Our studies of the Miller Range lunar meteorites MIL 090034, 090036, and 090070 show them to be a diverse suite of rocks from the lunar highlands hereafter referred to as MIL 34, MIL 36, and MIL 70, resp. MIL34 and MIL70, the focus of this work, are crystalline melt breccias. Plagioclase compositions in both peak sharply around An96-97. Mg numbers of olivine vary from 58-65 with a few higher values. MIL36 is a regolith breccia. MIL 34 and MIL 70 have some of the highest Al2O3 abundances of lunar highland meteorites, indicating that they have among the largest modal abundances of plagioclase for lunar meteorites. They have lower Sc and Cr abundances than nearly all lunar highland meteorites except Dho 081, Dho 489 and Dho 733. MIL34 and MIL70 also have similar cosmic ray exposure (CRE) ages of approximately 1-2 Ma indicating they are launch paired. (MIL36 has a larger CRE age approximately greater than 70 Ma). Park et al. found a variation in Ar-Ar ages among subsamples of MIL 34 and MIL70, but preferred ages of 3500+/-110 Ma for the "Dark" phase of MIL 34 anorthite and 3520+/-30 Ma for the "Light" phase of MIL70. Bouvier et al. reported a Pb-Pb age of 3894+/-39 Ma for a feldspathic clast of MIL 34 and a similar age for a melt lithology. Here we reexamine the Rb-Sr and Sm-Nd isotopic data, which show complexities qualitatively consistent with those of the Ar-Ar and Pb-Pb data. The Sm-Nd data in particular suggest that the feldspathic compositions of MIL 34 and MIL 70 formed during initial lunar geochemical differentiation, and REE modeling suggests a relatively late-stage formation.

  1. Curation and Allocation of the New Antarctic Nakhlite, MIL03346

    NASA Technical Reports Server (NTRS)

    McBride, K. M.; Righter, K.; Satterwhite, C. E.; Schwarz, C.; Robinson, P.

    2005-01-01

    In January 2004, the ANSMET reconnaissance field team (Fig. 1) working in the Miller Range of the Transantarctic Mountains discovered a 715 g achondrite that was instantly recognized as unique. Named MIL03346, initial processing (NASA Johnson Space Center or JSC) and classification (Smithsonian Institution or SI) revealed this achondrite to be a nakhlite (Fig. 2). MIL03346 is the seventh nakhlite recognized in world collections [2], the third nakhlite returned from Antartica, and the first nakhlite in the US Antarctic collection (Table 1). The following is a summary of the steps taken in the processing and allocating of MIL 03346 and some comparisons to some other lunar and martian meteorites processed and allocated at JSC.

  2. Partially fluorinated MIL-47 and Al-MIL-53 frameworks: influence of functionalization on sorption and breathing properties.

    PubMed

    Biswas, Shyam; Rémy, Tom; Couck, Sarah; Denysenko, Dmytro; Rampelberg, Geert; Denayer, Joeri F M; Volkmer, Dirk; Detavernier, Christophe; Van Der Voort, Pascal

    2013-03-14

    Two perfluorinated metal hydroxo terephthalates [M(III)(OH)(BDC-F)]·n(guests) (M(III) = V, MIL-47-F-AS or 1-AS; Al, Al-MIL-53-F-AS or 2-AS) (BDC-F = 2-fluoro-1,4-benzenedicarboxylate; AS = as-synthesized) have been synthesized by a hydrothermal method using microwave irradiation (1-AS) or conventional electric heating (2-AS), respectively. The unreacted or occluded H(2)BDC-F molecules can be removed under vacuum by direct thermal activation or exchange of guest molecules followed by thermal treatment leading to the empty-pore forms of the title compounds [V(IV)(O)(BDC-F)] (MIL-47-F, 1) and [Al(III)(OH)(BDC-F)] (Al-MIL-53-F, 2). Thermogravimetric analysis (TGA) and temperature-dependent XRPD (TDXRPD) experiments indicate that the compounds are stable up to 385 and 480 °C, respectively. Both of the thermally activated compounds exhibit significant microporosity, as verified by N(2), CO(2), n-hexane, o- and p-xylene sorption analyses. The structural changes of 2 upon adsorption of CO(2), n-hexane, o- and p-xylene were highly influenced due to functionalization by -F groups, as compared to parent Al-MIL-53. The -F groups also introduce a certain degree of hydrophobicity into the frameworks, as demonstrated by the H(2)O sorption analyses. PMID:23381460

  3. The flexibility of modified-linker MIL-53 materials.

    PubMed

    Munn, Alexis S; Pillai, Renjith S; Biswas, Shyam; Stock, Norbert; Maurin, Guillaume; Walton, Richard I

    2016-03-01

    The flexibility of eight aluminium hydroxo terephthalates [Al(OH)(BDC-X)]·n(guest) (BDC = 1,4-benzene-dicarboxylate; X = -H, -CH3, -Cl, -Br, -NH2, -NO2, -(OH)2, -CO2H) crystallising in the MIL-53-type structure was investigated upon thermal dehydration of as-made samples, superhydration and methanol adsorption/desorption using in situ powder X-ray diffraction (PXRD). Profile fitting was used to determine lattice parameters as a function of time and/or temperature to describe their structural evolution. It has thus been shown that while methanol vapour adsorption induces an opening of all the modified frameworks, except the -NH2 material, superhydration only leads to open structures for Al-MIL-53-NO2, -Br and -(OH)2. All the MIL-53 solids, except Al-MIL-53-(OH)2 are present in the open structures upon thermal dehydration. In addition to the exploration of the breathing behavior of this MIL-53 series, the issue of disorder in the distribution of the functional groups between the organic linkers was explored. As a typical illustration, density functional theory calculations were carried out on different structures of Al-MIL-53-Cl, in which the distribution of -Cl within two adjacent BDC linkers is varied. The results show that the most energetically stable configuration leads to the best agreement with the experimental PXRD pattern. This observation supports that the distribution of the selected linker substituent in the functionalised solid is governed by energetics and that there is a preference for an ordering of this arrangement. PMID:26465320

  4. The SMART MIL-STD-1553 bus adapter hardware manual

    NASA Technical Reports Server (NTRS)

    Ton, T. T.

    1981-01-01

    The SMART Multiplexer Interface Adapter, (SMIA) a complete system interface for message structure of the MIL-STD-1553, is described. It provides buffering and storage for transmitted and received data and handles all the necessary handshaking to interface between parallel 8-bit data bus and a MIL-STD serial bit stream. The bus adapter is configured as either a bus controller of a remote terminal interface. It is coupled directly to the multiplex bus, or stub coupled through an additional isolation transformer located at the connection point. Fault isolation resistors provide short circuit protection.

  5. MIL-H-8501B: Application to shipboard terminal operations

    NASA Technical Reports Server (NTRS)

    Cappetta, A. N.; Johns, J. B.

    1993-01-01

    The philosophy and structure of the proposed U.S. Military Specification for Handling Qualities Requirements for Military Rotorcraft, MIL-H-8501B, are presented with emphasis on shipboard terminal operations. The impact of current and future naval operational requirements on the selection of appropriate combinations of basic vehicle dynamics and usable cue environments are identified. An example 'walk through' of MIL-H-8501B is conducted from task identification to determination of stability and control requirements. For selected basic vehicle dynamics, criteria as a function of input/response magnitude are presented. Additionally, rotorcraft design development implications are discussed.

  6. Advanced MIL-STD-1553 UHF/VHF radio

    NASA Astrophysics Data System (ADS)

    Christiano, Paul F.

    Hardware and software for the control of multiple UHF/VHF radios aboard an aircraft via the MIL-STD-1553 data bus are described, and the system architecture is illustrated with extensive diagrams and flow charts. The system comprises independent mulitpurpose display/entry units, a bus-control processor, an audio control distribution unit, and the radios and antennas. The characteristics of the radios are reviewed, and the control operation is outlined. The use of the MIL-STD-1553 bus is shown to simplify radio operation, reduce crew intervention requirements, and provide crew and maintenance personnel with accurate information on the operating capabilities of damaged or malfunctioning radios.

  7. The SMART MIL-STD-1553 bus adapter hardware manual

    NASA Astrophysics Data System (ADS)

    Ton, T. T.

    1981-04-01

    The SMART Multiplexer Interface Adapter, (SMIA) a complete system interface for message structure of the MIL-STD-1553, is described. It provides buffering and storage for transmitted and received data and handles all the necessary handshaking to interface between parallel 8-bit data bus and a MIL-STD serial bit stream. The bus adapter is configured as either a bus controller of a remote terminal interface. It is coupled directly to the multiplex bus, or stub coupled through an additional isolation transformer located at the connection point. Fault isolation resistors provide short circuit protection.

  8. Photoelectrical, photophysical and photocatalytic properties of Al based MOFs: MIL-53(Al) and MIL-53-NH2(Al)

    NASA Astrophysics Data System (ADS)

    An, Yang; Li, Huiliang; Liu, Yuanyuan; Huang, Baibiao; Sun, Qilong; Dai, Ying; Qin, Xiaoyan; Zhang, Xiaoyang

    2016-01-01

    Two Al based MOFs (MIL-53(Al) and MIL-53-NH2 (Al)) were synthesized, and their photoelectrical, photophysical and photocatalytic properties towards oxygen evolution from water were investigated. Different from the ligand to metal charge transfer process previously reported, we proposes a new photocatalytic mechanism based on electron tunneling according to the results of theoretical calculation, steady state and time resolved fluorescence spectra. The organic linkers absorb photons, giving rise to electrons and holes. Then, the photogenerated electrons tunnel through the AlO6-octahedra, which not only inhibit the recombination of photogenerated charge carriers, but also is a key factor to the photocatalytic activity of Al based MOFs.

  9. Pod-mounted MIL-STD-2179B recorder

    NASA Astrophysics Data System (ADS)

    Kessler, William D.; Abeille, Pierre; Sulzer, Jean-Francois

    1991-12-01

    A MIL-STD-2179B recorder mounted within a high-performance aircraft pod is described, with emphasis on the recorder's features that allow it to meet this standard in the severe environment encountered. Specific examples of design features which minimize the effects of shock and vibration as well as temperature and humidity are given.

  10. Fiber optic demonstration of MIL-STD-1760 stores interconnect

    NASA Astrophysics Data System (ADS)

    Nelson, Gary L.; Cosimini, Gregory J.; Bartnik, Daniel J.

    The authors describe a laser-diode-based, fiber-optic stores management interconnect demonstration system. System test results for MIL-STD-1760 compliance are presented. These tests include bandwidth, latency, step input response, transient (T-pulse) response, and signal to noise ratio.

  11. Interface For MIL-STD-1553B Data Bus

    NASA Technical Reports Server (NTRS)

    Davies, Bryan L.; Osborn, Stephen H.; Sullender, Craig C.

    1993-01-01

    Electronic control-logic subsystem acts as interface between microcontroller and MIL-STD-1553B data bus. Subsystem made of relatively small number of integrated circuits. Advantages include low power, few integrated-circuit chips, and little need for control signals.

  12. Compact, Low-Overhead, MIL-STD-1553B Controller

    NASA Technical Reports Server (NTRS)

    Katz, Richard; Barto, Rod

    2009-01-01

    A compact and flexible controller has been developed to provide MIL-STD- 1553B Remote Terminal (RT) communications and supporting and related functions with minimal demand on the resources of the system in which the controller is to be installed. (MIL-STD-1553B is a military standard that encompasses a method of communication and electrical-interface requirements for digital electronic subsystems connected to a data bus. MIL-STD-1553B is commonly used in defense and space applications.) Many other MIL-STD-1553B RT controllers are complicated, and to enable them to function, it is necessary to provide software and to use such ancillary separate hardware devices as microprocessors and dual-port memories. The present controller functions without need for software and any ancillary hardware. In addition, it contains a flexible system interface and extensive support hardware while including on-chip error-checking and diagnostic support circuitry. This controller is implemented within part of a modern field-programmable gate array.

  13. Data acquisition techniques used for MIL-STD-1553 data

    NASA Astrophysics Data System (ADS)

    Cellarius, Mark R.; Penharlow, David

    This paper will address various applications and methods used for the acquisition, recording, and telemetering of data from the MIL-STD-1553 avionic multiplexer data bus installations in aircraft, missiles, and other vehicles. Discussions of the problems encountered and hardware utilized in current applications are reviewed. The innovative techniques used to optimize system performance, and future trends for program requirements are also discussed.

  14. The effects of MIL-STD-461B specification for space applications

    NASA Astrophysics Data System (ADS)

    Turesin, V. M.

    1982-07-01

    The effects of Parts 1 and 3 of MIL-STD-461B in relation to spacecraft and launch vehicles, including associated ground equipment are discussed. The newly imposed requirements of MIL-STD-461B and deleted and revised requirements of MIL-STD-461A are examined. Specification limit changes for conducted emission, radiation emission, and susceptibility requirements are compared.

  15. Remarkable adsorptive performance of a metal-organic framework, vanadium-benzenedicarboxylate (MIL-47), for benzothiophene.

    PubMed

    Khan, Nazmul Abedin; Jun, Jong Won; Jeong, Jong Hwa; Jhung, Sung Hwa

    2011-01-28

    Liquid-phase adsorption of benzothiophene over isotypic MOFs such as MIL-47 and MIL-53(Al, Cr) has shown that a metal ion of a MOF-type material has a dominant role in adsorptive desulfurization and MIL-47 has a remarkable performance. PMID:21152546

  16. Environmentally friendly synthesis of highly hydrophobic and stable MIL-53 MOF nanomaterials.

    PubMed

    Liu, Jia; Zhang, Feng; Zou, Xiaoqin; Yu, Guangli; Zhao, Nian; Fan, Songjie; Zhu, Guangshan

    2013-08-28

    The preparation of highly hydrophobic and stable MIL-53(Al) nanomaterials was achieved by an ionothermal synthesis strategy. The hydrophobicity of MIL-53(Al)it was studied by water adsorption; and the enhancement in this property was discussed with respect to its reference to MIL-53(Al)ht. PMID:23863860

  17. A MIL-STD 1760A advanced terminal

    NASA Astrophysics Data System (ADS)

    Friedman, Steven N.

    Attention is given to the BUS-65153 Small Terminal Interface Circuit (STIC), the smallest self-contained MIL-STD-1553A/B Notice 1 & 2 and MIL-STD-1760A dual redundant Remote Terminal (RT). The Terminal was designed to support a dual redundant RT protocol, including special transceivers. The author discusses the key features, especially the programmable options which make this terminal so flexible. The STIC has programmable features, such as 12/16 MHz clock selection, improved zero crossing tolerance, external status word control, and two- or three-state operation. A buffered DMA interface, programmable for 8 or 16-bit transfers, supports a variety of microprocessors. The timing and control signals available to the terminal designer are also examined.

  18. Third generation MIL-STD-1553B LSI chip set

    NASA Astrophysics Data System (ADS)

    Beasley, R. D.

    1982-11-01

    Marconi Avionics Limited's experience with MIL-STD-1553 commenced with the implementation of an a standard remote terminal in the Head Up Display for the General Dynamics F16 by our Airborne Displays Division. The Flight Automation Research Laboratory (FARL) has subsequently completed a circuit design for the digital section of a MIL-STD-1553B terminal with the LSI implementation carried out by Marconi Electronic Devices Ltd. These LSI devices are currently available through Circuit Technology Inc. of New York. This paper will review the current LSI terminal activity undertaken by FARL. This activity has used experience gained during the previous five-element 1553B LSI development as the foundation for a third generation two-element 1553 LSI terminal design. The subsequent semiconductor implementation is a collaborative exercise between the GEC Hirst Research Centre and FARL.

  19. The Fairchild MIL-STD-1553 Serial Multiplex Bus Tester

    NASA Astrophysics Data System (ADS)

    Dunn, A. M.

    The Fairchild Serial Multiplex Bus Tester (SMBT) is a general purpose computer controlled MIL-STD-1553 stimulus/response/analyzer. SMBT has been selected to fulfill the data bus testing requirements of the Air Force Modular Automatic Test Equipment (MATE) systems. The design is three separate devices or functions: a monitor, a bus controller, and a remote terminal simulator, which may be operated in any combination. The purpose is to integrate the Monitor, Controller, and Remote Terminal functions into a single unit. SMBT may be controlled and synchronized by a master computer performing a coordinated total checkout of a unit under test. The monitor allows a collection of 1024 word 'windows' of bus traffic and simultaneously accumulate error statistics in all bus traffic. A system self check is incorporated as an additional feature of the design. In summary, the SMBT is designed to provide necessary stimulus, response and analysis capability for MIL-STD-1553 Line Replaceable Unit (LRU) testing.

  20. MIL-STD-1553B system design in SST application

    NASA Astrophysics Data System (ADS)

    Xiong, Ying

    2001-06-01

    In this paper, we will first introduce what is MIL-STD-1553B and why we choose it. Then we will analyze the characteristics and the reliability of this standard. When we use this protocol to implement our SDU system in the SST, we also need to describe the whole system in which the 1553 standard is used. Finally, we will put our most attention on the system design, including hardware interconnection and software program.

  1. Network Extender for MIL-STD-1553 Bus

    NASA Technical Reports Server (NTRS)

    Marcus, Julius; Hanson, T. David

    2003-01-01

    An extender system for MIL-STD-1553 buses transparently couples bus components at multiple developer sites. The bus network extender is a relatively inexpensive system that minimizes the time and cost of integration of avionic systems by providing a convenient mechanism for early testing without the need to transport the usual test equipment and personnel to an integration facility. This bus network extender can thus alleviate overloading of the test facility while enabling the detection of interface problems that can occur during the integration of avionic systems. With this bus extender in place, developers can correct and adjust their own hardware and software before products leave a development site. Currently resident at Johnson Space Center, the bus network extender is used to test the functionality of equipment that, although remotely located, is connected through a MILSTD- 1553 bus. Inasmuch as the standard bus protocol for avionic equipment is that of MIL-STD-1553, companies that supply MIL-STD-1553-compliant equipment to government or industry and that need long-distance communication support might benefit from this network bus extender

  2. Single-chip solution of MIL-STD-1553A and MIL-STD-1553B data communications

    NASA Astrophysics Data System (ADS)

    Bauer, Robert J.

    Several versions of the Avionics Time-Multiplexed 1553 serial communication standards are in use. Solutions available for some 1553 protocols are often large and complex, and are not designed to be usable for more than one protocol. This paper describes the basic differences among the 1553 protocols, and discusses the system and architectural aspects of a single-chip solution that meet all requirements for a complete dual-redundant Bus Controller and Remote Terminal (BCRT) for the following 1553 standards: MIL-STD-1553A, MIL-STD-1553B, McDonnell Douglas A3818, McDonnell Douglas A5332, McDonnel Douglas A5690, and Grumman Aerospace SP-G-151A. Easily integrated into a variety of system architectures and requiring little CPU overhead, the single-chip device contains all memory management, error logging, and a simple-to-use processor interface.

  3. VLSI MIL-STD-1750A processor development

    NASA Astrophysics Data System (ADS)

    Gaertner, M.; Winter, T.; Brauchmann, W.

    An American company is developing a VLSI program to design, fabricate, characterize, and deliver a family of General Purpose Computers optimized to execute MIL-STD-1750A Notice 1. The CPU architecture is fashioned in an extensible functional module configuration with a performance range from 0.9 MIPS to 1.5 MIPS (DAIS-type Mix). The three configurations which have emerged include baseline CPU, baseline CPU plus floating point accelerator, and 32-bit data path CPU (ISA Invisible). It is pointed out that these machines will employ multisource VLSI low power CMOS technology and will be fully qualified to meet military environmental specifications.

  4. MIL-STD-1553 dual redundant remote terminal superhybrid

    NASA Astrophysics Data System (ADS)

    Friedman, S. N.

    This paper describes the performance, physical and electrical characteristics of the BUS-65112 Superhybrid, which performs as a fully compliant MIL-STD-1553 Dual Redundant Remote Terminal Unit (RTU). A discussion of the Custom Monolithic LSI components implemented in the Superhybrid is included. The RTU's special features and capabilities is highlighted, along with special programming options which facilitate a broad array of applications. The BUS-65112 Superhybrid contains all the necessary control lines to allow easy Direct Memory Access (DMA). The interface timing, operational philosophy, and a block diagram highlighting the Superhybrid's functional architecture are included.

  5. Organic Linker Defines the Excited-State Decay of Photocatalytic MIL-125(Ti)-Type Materials.

    PubMed

    Santaclara, Jara G; Nasalevich, Maxim A; Castellanos, Sonia; Evers, Wiel H; Spoor, Frank C M; Rock, Kamila; Siebbeles, Laurens D A; Kapteijn, Freek; Grozema, Ferdinand; Houtepen, Arjan; Gascon, Jorge; Hunger, Johannes; van der Veen, Monique A

    2016-02-01

    Recently, MIL-125(Ti) and NH2 -MIL-125(Ti), two titanium-based metal-organic frameworks, have attracted significant research attention in the field of photocatalysis for solar fuel generation. This work reveals that the differences between these structures are not only based on their light absorption range but also on the decay profile and topography of their excited states. In contrast to MIL-125(Ti), NH2 -MIL-125(Ti) shows markedly longer lifetimes of the charge-separated state, which improves photoconversion by the suppression of competing decay mechanisms. We used spectroelectrochemistry and ultrafast spectroscopy to demonstrate that upon photoexcitation in NH2 -MIL-125(Ti) the electron is located in the Ti-oxo clusters and the hole resides on the aminoterephthalate unit, specifically on the amino group. The results highlight the role of the amino group in NH2 -MIL-125(Ti), the electron donation of which extends the lifetime of the photoexcited state substantially. PMID:26871265

  6. Submicron CMOS MIL-STD-1750A based mission processor

    NASA Astrophysics Data System (ADS)

    Coulon, Kenneth E.

    The author describes the design of a MIL-STD-1750A mission processor (MP), which is generally based on the US Air Force Pave Pillar architecture. The MP is composed of a power conditioner unit, a chassis assembly, and a set of SEM-E (3/4 ATR)-size common modules. The common modules utilize a set of seven complex submicrometer CMOS integrated circuits as building blocks. The internal design architecture features a dual PI-Bus for intermodule communication and a dual TM-Bus for operational test and maintenance. The MP is capable of over 22-million-instructions/s performance on the Defense Avionics Instructions Set (DAIS) mix and contains up to 2.56 million words of random-access memory and 288 thousand words of read-only memory. The MP provides external interfaces to three dual redundant MIL-STD-1553B serial communication buses, two differential Small Computer System Interface (SCSI) buses, an IEEE-488 bus, and miscellaneous digital and analog discrete lines.

  7. Geochemistry of Lunar Highland Meteorites Mil, 090034, 090036 AND 090070

    NASA Technical Reports Server (NTRS)

    Shirai, N.aoki; Ebihara, M.; Sekimoto, S.; Yamaguchi, A.; Nyquist, L.; Shih, C.-Y.; Park, J.; Nagao, K.

    2012-01-01

    Apollo and Luna samples were collected from a restricted area on the near side of the Moon, while the source craters of the lunar meteorites are randomly distributed. For example, Takeda et al. [1] and Yamaguchi et al. [2] found a variety of lithic clasts in Dho 489 and Y 86032 which were not represented by Apollo samples, and some of these clasts have lower rare earth elements (REE) and FeO abundances than Apollo anorthosites, respectively. Takeda et al. [1] and Yamaguchi et al. [2] concluded that Dho 489 and Y 86032 originated from the lunar farside. Therefore, lunar meteorites provide an opportunity to study lunar surface rocks from areas not sampled by Apollo and Luna missions. Three lunar anorthitic breccias (MIL 090034, 090036 and 090070) were found on the Miller Range Ice Field in Antarctica during the 2009-2010 ANSMET season [3]. In this study, we determined elemental abudnances for MIL 090034, 090036 and 090070 by using INAA and aimed to characterize these meteorites in chemical compositions in comparison with those for other lunar meteorites and Apollo samples.

  8. MIL-STD-1553 BUS exerciser/tester

    NASA Astrophysics Data System (ADS)

    Friedman, S. N.

    The BUS-68000 Exerciser functions as a fully programmable bus controller or can simulate remote terminals. It is a low-cost portable instrument for testing and troubleshooting MIL-STD-1553 systems. It can simulate all MIL-STD-1553 message formats and provides up to eight message blocks (up to 49 words deep in each). Keyboard and display function are tabulated in detail, along with pin functions. The front panel keyboard and display or IEEE-488 and RS-232 optional I/O ports are available for ease of programming. Five programming examples are given. Encoder error injection and format error injection are easily achieved. Format and word error detection are indicated by front panel LEDs and an error code display. With the RS-232 option, the BUS-68000 can print out the entire block on a CRT or hardcopy printer to permit a complete preview of each message block, including the programmed encoder errors. It is then possible to review the programmed encoder errors. It is then possible to review the message blocks after the transfer to obtain data information and errors encoded or detected.

  9. A modular approach to MIL-STD-1553 simulation support

    NASA Astrophysics Data System (ADS)

    McCartney, R. I.; Phillips, R. E.

    With the adoption of the MIL-STD-1553 multiplex data bus as a communication protocol in avionics systems, evolves the need for dedicated, flexible laboratory facilities as test and development support centers. This flexibility has been difficult to achieve in the past because of the large amount of special purpose hardware involved in the emulation of a MIL-STD-1553 system. This paper describes and discusses a state-of-the-art approach to developing a real-time computer simulation of any established and/or future 1553 system, using as the core element the Multiplex Bus Terminal (MBT). Such a system can be configured to the desired level of complexity due to the software programmability of the MBT hardware. Utilizing a comprehensive package of high level language callable drivers and handlers, or by assembly level real-time programming support, the user can program the MBT for use as a stand alone, hot bench test station, or as the key element in a full scale, computer modeled, 1553 avionic system.

  10. Amino Acids in the Antarctic Martian Meteorite MIL03346

    NASA Technical Reports Server (NTRS)

    Glavin, D. P.; Aubrey, A.; Dworkin, J. P.; Botta, O.; Bada, J. L.

    2005-01-01

    The report by McKay et al. that the Martian meteorite ALH84001 contains evidence for life on Mars remains controversial. Of central importance is whether ALH84001 and other Antarctic Martian meteorites contain endogenous organic compounds. In any investigation of organic compounds possibly derived from Mars it is important to focus on compounds that play an essential role in biochemistry as we know it and that have properties such as chirality which can be used to distinguish between biotic versus abiotic origins. Amino acids are one of the few compounds that fulfill these requirements. Previous analyses of the Antarctic Martian meteorites ALH84001 and EETA79001 have shown that these meteorites contain low levels of terrestrial amino acid contamination derived from Antarctic ice meltwater. Here we report preliminary amino acid investigations of a third Antarctic Martian meteorite MIL03346 which was discovered in Antarctica during the 2003-04 ANSMET season. Additional information is included in the original extended abstract

  11. A MIL-STD-1553 flexible interface device and applications

    NASA Astrophysics Data System (ADS)

    Meyer, D. H.; Parr, D. R.

    The design, testing, and applications in a number of military equipments of the 1553 interface device are described. The device is fabricated using 4-micron CMOS/SOS and is packaged in a 48-pin DIP or chip carrier. The chip block diagram is presented along with the dual interface pinout, the register diagram, flag register information, and chip control line definition. The MIL-STD-1553 VLSI chip is currently being implemented in the control display unit and bus/subsystem interface unit used in the USAF Fuel Savings Advisory System Program, and in a modified ARN-118 TACAN. The VLSI device is also being considered for the DF-206A receiver project and several airborne GPS receivers.

  12. Synergy of mIL-21 and mIL-15 in enhancing DNA vaccine efficacy against acute and chronic Toxoplasma gondii infection in mice.

    PubMed

    Li, Zhong-Yuan; Chen, Jia; Petersen, Eskild; Zhou, Dong-Hui; Huang, Si-Yang; Song, Hui-Qun; Zhu, Xing-Quan

    2014-05-23

    The synergistic protective efficacy of murine interleukin 21 (mIL-21) and mIL-15 administrated with DNA vaccine against acute and chronic Toxoplasma gondii infection in mice was investigated using T. gondii MIC8 (TgMIC8) as a model. We cloned mIL-21 and mIL-15 from splenic tissues of Kunming mice, and constructed eukaryotic plasmid pVAX/mIL-15, pVAX/mIL-21, and pVAX/mIL-21/mIL-15, respectively. After immunizing with pVAX/TgMIC8 in the presence or absence of these cytokines, immune responses were analyzed using lymphoproliferative assay, cytokine and serum antibody measurements, flow cytometric surface markers on lymphocytes and protection against acute and chronic T. gondii infection. Mice receiving pVAX/TgMIC8 alone developed a strong humoral responses and Th1 type cellular immune responses, and showed an increase of CD4+ and CD8+ T cells compared with all the controls. Adding pVAX/mIL-21 to pVAX/TgMIC8 compared to pVAX/TgMIC8 resulted in only a slight increase in humoral and cellular immune responses, and this immune response was lower than that induced by the pVAX/mIL-15 combined with pVAX/TgMIC8. Co-administration of pVAX/mIL-21/mIL-15 combined with pVAX/TgMIC8 elicited the strongest humoral and cellular immune responses among all the groups, leading to significantly increased survival time against acute infection and the significant reduction of tissue cysts, compared to all the controls. Synergy of mIL-21 and mIL-15 can facilitate specific humoral as well as cellular immune responses elicited by DNA vaccine against acute and chronic T. gondii infection in mice. PMID:24690150

  13. User's guide: Software support packages for SANDAC V/MIL-STD-1553B interface

    SciTech Connect

    Richards, S.C.

    1989-01-01

    This report contains the software support packages currently available for the SANDAC V MIL-STD-1553B interface. Use of these packages allows those developing a specific application to use the MIL-STD-1553 bus without requiring the programmer to become intimately involved with the interface hardware. 7 refs.

  14. Using the MIL-STD-1553B to link up all subsystems of Solar Space Telesocpe.

    NASA Astrophysics Data System (ADS)

    Duan, Xiaochang

    1999-12-01

    From the 1980's, the use of MIL-STD-1553B in satellite programs has greatly increased. As an advanced satellite with numerous subsystems, Solar Space Telescope (SST) chooses this standard to meet its need for telemetry. This paper introduces some parts of MIL-STD-1553B that can be used in Solar Space Telescope.

  15. MIL-68 (In) nano-rods for the removal of Congo red dye from aqueous solution.

    PubMed

    Jin, Li-Na; Qian, Xin-Ye; Wang, Jian-Guo; Aslan, Hüsnü; Dong, Mingdong

    2015-09-01

    MIL-68 (In) nano-rods were prepared by a facile solvothermal synthesis using NaOAc as modulator agent at 100°C for 30 min. The BET test showed that the specific surface area and pore volume of MIL-68 (In) nanorods were 1252 m(2) g(-1) and 0.80 cm(3) g(-1), respectively. The as-prepared MIL-68 (In) nanorods showed excellent adsorption capacity and rapid adsorption rate for removal of Congo red (CR) dye from water. The maximum adsorption capacity of MIL-68 (In) nanorods toward CR reached 1204 mg g(-1), much higher than MIL-68 (In) microrods and most of the previously reported adsorbents. The adsorption process of CR by MIL-68 (In) nano-rods was investigated and found to be obeying the Langmuir adsorption model in addition to pseudo-second-order rate equation. Moreover, the MIL-68 (In) nanorods showed an acceptable reusability after regeneration with ethanol. All information gives an indication that the as-prepared MIL-68 (In) nanorods show their potential as the adsorbent for highly efficient removal of CR in wastewater. PMID:25989058

  16. Molecular promoting of aluminium metal-organic framework topology MIL-101 by N,N - dimethylformamide

    PubMed Central

    Goesten, Maarten G.; Magusin, Pieter C.M.M; Pidko, Evgeny A.; Mezari, Brahim; Hensen, Emiel J.M.; Kapteijn, Freek; Gascon, Jorge

    2014-01-01

    In-situ NMR and DFT modelling demonstrate that N,N-dimethylformamide (DMF) promotes the formation of metal-organic framework NH2-MIL-101(Al). In-situ NMR studies show that upon dissociation of an aluminium-coordinated aqua ligand in NH2-MOF-235(Al), DMF forms an HCl-DMF complex during synthesis. This reaction induces a transformation from the MOF-235 topology into the MIL-101 topology. Electronic Structure Density Functional Theory (DFT) calculations show that the use of DMF instead of water as synthesis solvent decreases the energy gap between the kinetically favored MIL-101 and the thermodynamically favored MIL-53 products. DMF therefore promotes the MIL-101 topology both kinetically and thermodynamically. PMID:24405155

  17. Molecular promoting of aluminum metal-organic framework topology MIL-101 by N,N-dimethylformamide.

    PubMed

    Goesten, Maarten G; Magusin, Pieter C M M; Pidko, Evgeny A; Mezari, Brahim; Hensen, Emiel J M; Kapteijn, Freek; Gascon, Jorge

    2014-01-21

    In situ NMR and DFT modeling demonstrate that N,N-dimethylformamide (DMF) promotes the formation of metal-organic framework NH2-MIL-101(Al). In situ NMR studies show that upon dissociation of an aluminum-coordinated aqua ligand in NH2-MOF-235(Al), DMF forms a H-Cl-DMF complex during synthesis. This reaction induces a transformation from the MOF-235 topology into the MIL-101 topology. Electronic structure density functional theory (DFT) calculations show that the use of DMF instead of water as the synthesis solvent decreases the energy gap between the kinetically favored MIL-101 and thermodynamically favored MIL-53 products. DMF therefore promotes MIL-101 topology both kinetically and thermodynamically. PMID:24405155

  18. Preparation, characterization, and hydrogen storage capacity of MIL-53 metal-organic frameworks.

    PubMed

    Lin, Kuen-Song; Adhikari, Abhijit Krishna; Tu, Mu-Ting; Wang, Chieh-Hung; Chiang, Chao-Lung

    2013-04-01

    Metal organic frameworks (MOFs) are considered as most promising candidate for hydrogen storage material for practical application. MIL-53(Cr) MOFs were synthesized from Cr(NO3)3 x 9H2O combined with terephthalic acid organic linker. MIL-53(Cr) MOFs are octahedral in shape and the particle size was around 10 microm identified by FE-SEM. The cleaning of the MOFs crystals with different solvents at different warm temperature were found effective and approved to increase the specific surface area and porosity of MIL-53(Cr) MOFs. The XRD patterns represented that MIL-53(Cr) MOFs had well crystalline structures. Nitrogen adsorption isotherms show that Mil-53(Cr) has approximately type-I isotherm with a highest BET specific surface area of 1946 m2 g(-1) after treated with hot methanol. Hydrogen adsorption study shows that this material can store 0.45 wt.% of H2 measured at 303 K and 32 bar. The pre-edge XANES spectra confirm the existence of Cr(III) in crystalline framework of MIL-53(Cr) and the sharp feature at 6007 eV in XANES spectra represents the dipole-allowed electron transition from 1s to 4p(xy). In addition, EXAFS spectra indicate that MIL-53(Cr) metal organic frameworks structure has the Cr-O bond distance of 1.96 angstroms with a coordination number of 5.4. PMID:23763128

  19. The Oxygen Isotopic Composition of MIL 090001: A CR2 Chondrite with Abundant Refractory Inclusions

    NASA Technical Reports Server (NTRS)

    Keller, Lindsay P.; McKeegan, K. D.; Sharp, Z. D.

    2012-01-01

    MIL 090001 is a large (>6 kg) carbonaceous chondrite that was classified as a member of the CV reduced subgroup (CVred) that was recovered during the 2009-2010 ANSMET field season [1]. Based on the abundance of refractory inclusions and the extent of aqueous alteration, Keller [2] suggested a CV2 classification. Here we report additional mineralogical and petrographic data for MIL 090001, its whole-rock oxygen isotopic composition and ion microprobe analyses of individual phases. The whole rock oxygen isotopic analyses show that MIL 090001 should be classified as a CR chondrite.

  20. Technical publication transfer test with McDonnell Aircraft Company: MIL-M-28001 (SGML) and MIL-D-28000 Class 1 (IGES)

    SciTech Connect

    Not Available

    1990-06-25

    The CALS Test Network (CTN) conducted a CTN Planned Test (CPT) of several CALS standards related to the transfer of technical publication data: MIL-STD-1840A (1840A), MIL-D-28000 Class I (28000), MIL-M-28001 (28001), and MIL-D-28003 (28003). The test was conducted with the McDonnell Aircraft Company (CMAIR) of St. Louis, Missouri in accordance with part one of CTN Test Plan CTN89-TM-06 and using material from an F-15E technical manual. One focus of the test was the transfer of a moderately large volume of technical publication data. There were 9 text files, 74 Initial Graphics Exchange Specification (IGES) files, and 74 Computer Graphics Metafile (CGM) files in the exchange package. A noteworthy feature of the test was its early attempt to exchange CGM data. Part one of CTN89-TM-06 called for technical publication data to be output from MCAIR's Xyvision system on 9-track magnetic tape. The data was to be in accordance with the 28001 subset of the Standard Generalized Mark-up Language (SGML) and the 28001 Document Type Definition (DTD) that conformed to MIL-M-38784B, the general style and format requirements for technical manuals. Technical illustrations in the manual were to be done in accordance with 28000 Class I (IGES) and 28003 (CGM). Part two of the test called for the test tape to be read into another technical publication system where the text would be modified and the vector illustrations would all be converted to raster, in accordance with MIL-R-28002. This part of the test is not covered in this report.

  1. Electrostatic bonding of thin (approximately 3 mil) 7070 cover glass to Ta2O5 AR-coated thin (approximately 2 mil) silicon wafers and solar cells

    NASA Technical Reports Server (NTRS)

    Egelkrout, D. W.; Horne, W. E.

    1980-01-01

    Electrostatic bonding (ESB) of thin (3 mil) Corning 7070 cover glasses to Ta2O5 AR-coated thin (2 mil) silicon wafers and solar cells is investigated. An experimental program was conducted to establish the effects of variations in pressure, voltage, temperature, time, Ta2O5 thickness, and various prebond glass treatments. Flat wafers without contact grids were used to study the basic effects for bonding to semiconductor surfaces typical of solar cells. Solar cells with three different grid patterns were used to determine additional requirements caused by the raised metallic contacts.

  2. Adsorptive removal of dibenzothiophene from model fuels over one-pot synthesized PTA@MIL-101(Cr) hybrid material.

    PubMed

    Jia, Shao-Yi; Zhang, Yan-Fei; Liu, Yong; Qin, Feng-Xiang; Ren, Hai-Tao; Wu, Song-Hai

    2013-11-15

    Hybrid nanomaterials comprising phosphotungstic acid (PTA) and MIL-101(Cr) were prepared through one-pot synthesis and post-modification methods and then were used as adsorbents of dibenzothiophene (DBT) from simulated diesel fuels. Samples obtained by different ways (encapsulation and impregnation) were characterized by nitrogen adsorption, transmission electron microscope (TEM), X-ray diffraction (XRD), Fourier transform infrared spectrum (FT-IR) and series of adsorption experiments. The equilibrium adsorption capacities of PTA@MIL-101(Cr) illustrated that the direct introduction of PTA into MIL-101(Cr) during synthesis resulted in a 10.7% increase compared with MIL-101(Cr). However, porous hybrid adsorbent PTA/MIL-101(Cr) prepared via post-modification method exhibited lower adsorption capacity than virgin MIL-101(Cr). The theoretical maximum adsorption capacity (Q0) of PTA@MIL-101(Cr) is 136.5mg S/g adsorbent, 4.2 times of MIL-101(Cr). Even in competitive adsorption between aromatic compounds, which possess strong affinity with MOFs, and DBT, PTA@MIL-101(Cr) and MIL-101(Cr) remained their effectiveness in removal of DBT in the system. Based on these results, it can be presumed that MIL-101(Cr), modified properly, can be used as a promising adsorbent for eliminating aromatics and S-compounds in commercial fuels simultaneously. PMID:24095999

  3. Correlating the EMC analysis and testing methods for space systems in MIL-STD-1541A

    NASA Astrophysics Data System (ADS)

    Perez, Reinaldo J.

    A study was conducted to improve the correlation between the electromagnetic compatibility (EMC) analysis models stated in MIL-STD-1541A and the suggested testing methods used for space systems. The test and analysis methods outlined in MIL-STD-1541A are described, and a comparative assessment of testing and analysis techniques as they relate to several EMC areas is presented. Suggestions on present analysis and test methods are introduced to harmonize and bring the analysis and testing tools in MIL-STD-1541A into closer agreement. It is suggested that test procedures in MIL-STD-1541A must be improved by providing alternatives to the present use of shielded enclosures as the primary site for such tests. In addition, the alternate use of anechoic chambers and open field test sites must be considered.

  4. Correlating the EMC analysis and testing methods for space systems in MIL-STD-1541A

    NASA Technical Reports Server (NTRS)

    Perez, Reinaldo J.

    1990-01-01

    A study was conducted to improve the correlation between the electromagnetic compatibility (EMC) analysis models stated in MIL-STD-1541A and the suggested testing methods used for space systems. The test and analysis methods outlined in MIL-STD-1541A are described, and a comparative assessment of testing and analysis techniques as they relate to several EMC areas is presented. Suggestions on present analysis and test methods are introduced to harmonize and bring the analysis and testing tools in MIL-STD-1541A into closer agreement. It is suggested that test procedures in MIL-STD-1541A must be improved by providing alternatives to the present use of shielded enclosures as the primary site for such tests. In addition, the alternate use of anechoic chambers and open field test sites must be considered.

  5. Spectroscopic Comparison of Lafayette and MIL 03346 Vein-Filling Materials

    NASA Astrophysics Data System (ADS)

    Kuebler, K. E.

    2014-06-01

    I characterize the phyllosilicate alteration in Lafayette using correlated Raman and EMP traverses, like those [1, 2] performed on ALHA 77005 and MIL 03346. Interpretations reflect the status of the WU database developed with the MMRS [4-6].

  6. Tutorial: MIL-STD-810D and the environmental engineering specialist

    SciTech Connect

    Caruso, H.

    1986-01-01

    In these tutorial notes, the author provides an overview of the proper use of MIL-STD-810D in a tailored environmental test program. The topics included are: an explanation of the significant new features of MIL-STD-810D; a comparison of the new test methods with the more traditional methods of the previous version; potential impact on program cost and schedule; potential impact on existing laboratory facilities; background rationale for the methodology selected; and new Data Item Description requirements.

  7. Small Explorer Data System MIL-STD-1773 fiber optic bus

    NASA Technical Reports Server (NTRS)

    Flanegan, Mark; Label, Ken

    1992-01-01

    The MIL-STD-1773 Fiber Optic Data Bus as implemented in the GSFC Small Explorer Data System (SEDS) for the Small Explorer Program is described. It provides an overview of the SEDS MIL-STD-1773 bus components system design considerations, reliability figures, acceptance and qualification testing requirements, radiation requirements and tests, error handling considerations, and component heritage. The first mission using the bus will be launched in June of 1992.

  8. Small Explorer Data System MIL-STD-1773 fiber optic bus

    NASA Astrophysics Data System (ADS)

    Flanegan, Mark; Label, Ken

    1992-06-01

    The MIL-STD-1773 Fiber Optic Data Bus as implemented in the GSFC Small Explorer Data System (SEDS) for the Small Explorer Program is described. It provides an overview of the SEDS MIL-STD-1773 bus components system design considerations, reliability figures, acceptance and qualification testing requirements, radiation requirements and tests, error handling considerations, and component heritage. The first mission using the bus will be launched in June of 1992.

  9. Hybrid MIL-STD-1553B/1773 electrical/optical buses

    NASA Astrophysics Data System (ADS)

    Briscoe, William G.

    The proper operation of two hybrid MIL-STD-1553B/1773 bus operations is demonstrated. Gateways were developed which made it possible to pass signals between the 1553B and 1773 segments of these hybrid buses. It is found that hybrid buses preserve the MIL-STD-1553B advantage of easy daisy chain connection of bus terminals while adding the DOD-STD-1773 advantages of fiber optics.

  10. Safety of floating drydocks in accordance with MIL-STD-1625A

    SciTech Connect

    Wasalaski, R.G.

    1982-10-01

    Recent accidents involving floating dry docks have raised concern about the rated lifting capacity and stability during drydocking operations. MIL-STD-1625A called for renewed attention to the problems of safety in drydocking naval ships in regard to the stability and buoyancy of floating dry docks. The U.S. NAVY, as a primary user of floating dry docks in this country, developed MIL-STD-1625A to certify drydocking facilities for a rated lifting capacity for drydocking naval ships. The intent of the MIL-STD is to provide guidance for certifying all new and existing drydocking facilities. This paper addresses the aspects of the MIL-STD that apply specifically to floating dry docks. Whereas, the MIL-STD addressed both the design and material condition of the dry dock and the associated machinery, this paper addresses only the lifting capacity and stability of the dock. Specifically, this paper will discuss safety during the operation of floating dry docks as it is affected by lifting capacity, stability and structural strength limits due to keel loading and buoyancy requirements. An example of the kind of data required by the MIL-STD-1625A will be presented.

  11. Spaceflight qualification of the SEDS MIL-STD-1773 fiber optic data bus

    NASA Astrophysics Data System (ADS)

    Flanegan, Mark C.

    1993-09-01

    The small explorer (SMEX) project at Goddard Space Flight Center (GSFC) launched the first spaceflight implementation of the MIL-STD-1773 fiber optic data bus on the Solar Anomalous Magnetospheric Particle Explorer (SAMPEX) in July of 1992. The Small Explorer Data System (SEDS), of which the MIL-STD-1773 data bus is a part, has been successful. The MIL-STD-1773 bus is the implementation of the MIL-STD-1553 protocol using fiber optics. Advantages of the fiber optic bus over the electrical bus include lower power, lower weight, and immunity from EMI/RFI. It does not radiate electrical or magnetic fields. It is a nonconductor so it cannot conduct electrical noise into or from a subsystem. This is particularly advantageous on a spacecraft with very sensitive instruments which are often susceptible to electrical interference. Although the MIL-STD-1773 bus is a 1 Mbps bus like the MIL-STD-1553 bus, the fiber optics also provide a path to the much higher rate systems required in upcoming NASA missions.

  12. Synthesis and modification of a functionalized 3D open-framework structure with MIL-53 topology.

    PubMed

    Ahnfeldt, Tim; Gunzelmann, Daniel; Loiseau, Thierry; Hirsemann, Dunja; Senker, Jürgen; Férey, Gerard; Stock, Norbert

    2009-04-01

    Aluminum aminoterephthalate Al(OH)[H(2)N-BDC] x 0.3 (H(2)N-H(2)BDC (denoted MIL-53-NH(2)(as)) was synthesized under hydrothermal conditions. The activation of the compound can be achieved in two steps. The treatment with DMF at 150 degrees C leads to Al(OH)[H(2)N-BDC] x 0.95 DMF (MIL-53-NH(2)(DMF)). In the second step, DMF is thermally removed at 130 degrees C. Upon cooling in air, the hydrated form Al(OH)[H(2)N-BDC] x 0.9 H(2)O (MIL-53-NH(2)(lt)) is obtained. The dehydration leads to a porous compound that exhibits hysteresis behavior in the N(2) sorption experiments. The MIL-53-NH(2)(lt) can be modified by postsynthetic functionalization using formic acid, and the corresponding amide Al(OH)[HC(O)N(H)-BDC] x H(2)O (MIL-53-NHCHO) is formed. All four phases were thoroughly characterized by X-ray powder diffraction, solid-state NMR and IR spectroscopy, and sorption measurements, as well as thermogravimetric and elemental analysis. Based on the refined lattice parameter similar breathing behavior of the framework as found in the unfunctionalized MIL-53 can be deduced. Solid-state NMR spectra unequivocally demonstrate the presence of the guest species, as well as the successful postsynthetic functionalization. PMID:19245258

  13. FADS: A demonstrator for MilComSat AOCS

    NASA Astrophysics Data System (ADS)

    Huddleston, Martin; Cope, Paul

    1995-03-01

    This project covers the attitude and orbit control systems (AOCS) research program being carried out as part of the MOD applied research program for AD CIS(OR)1. The project program is to evaluate the candidate sensor technologies and control algorithms, such as Kalman filters, which may be applied to future UK military ComSats. The specific needs of military satellites for robust and threat-resistant control are not offered by current civil technologies which normally use vulnerable earth sensors or RF pointing which is vulnerable to deception. The program is also to investigate ways of reducing control system complexity and improvements in attitude control precision by enabling structural modes to be controlled. The project examines the most promising attitude control system technologies required to support such future communications payloads. User requirements indicate a need for improved threat resistance and for narrower spot beams, and the program supports this perceived need by the use of improved sensors and control algorithms. Improved pointing on civil ComSats is normally by means of ground RF measurements to form a closed loop control system with the spacecraft. For threat reasons this method is unsuitable for military ComSats, and on-board sensors are therefore used. The use of Silicon array star or earth sensors are the most promising, and the sensor program is to concentrate on these. Limited development and available civil sensors will be considered. Experimental work is based on demonstrating and evaluating real hardware in-the-loop on an existing air bearing experimental rig. This offers the closest simulation of real flight performance that can be obtained. The program will develop the Filtered Attitude Determination System (FADS)rig to be fully representative of a MilSatCom satellite, threat-resistant AOCS solution, employing Silicon array star and earth sensors. Both the BAe Mosaic Earth Sensor (MES) nad Marconi Versatile Star Sensor (VSS) technologies show considerable potential as attitude sensors. The VSS and MES capabilities will be evalutated on the FADS rig.

  14. Hydrothermal crystal growth and Vernier structures of the metal benzenedicarboxylates MIL-47 and MIL-53 containing guest molecules of benzenecarboxylic acid

    NASA Astrophysics Data System (ADS)

    Wang, Xiqu; Jacobson, Allan J.

    2016-04-01

    The nanoporous frameworks VO(bdc), MIL-47, and M(OH)(bdc), MIL-53; bdc=1,4-benzenedicarboxylate, can absorb various guest species in their channels. As synthesized, the channels are filled with H2bdc molecules that have been reported to be disordered, except for [In(OH)bdc](H2bdc)3/4, 1, which has a inorganic-organic hybrid Vernier structure with the H2bdc molecules forming an ordered sublattice. Based on X-ray data from large single crystals grown by hydrothermal techniques, similar Vernier structures have been found for MIL-47, [VO(bdc)](H2bdc)5/7, 2, MIL-53Al, [Al(OH)(bdc)](H2bdc)11/16, 3, and MIL-53Ga, [Ga(OH)(bdc)](H2bdc)12/17, 4. The Vernier structures of 2-4 at room temperature were determined based on superstructure unit cells that index both host and guest sublattices: 2, space group P21, a=23.903(2), b=17.191(2), c=25.722(2) Å, β=105.914(8)°; 3, P21/n, a=105.224(4), b=12.2441(5), c=17.0143(6) Å, β=89.99(1)°; 4, P21, a=114.562(5), b=12.1503(5), c=17.4275(7) Å, β=89.99(1)°. The number of guest H2bdc molecules per framework metal ion is determined by the ratio of the repeat distances of the two sublattices which depends on the size of the metal ion in the octahedral chain. The octahedral chains are parallel to [201] in 2, and to [100] in 3 and 4. Remarkably, all atoms in 3 and 4 show significant sinusoidal modulations transverse to the chain axis.

  15. Adsorptive Separation of Acetylene from Light Hydrocarbons by Mesoporous Iron Trimesate MIL-100(Fe).

    PubMed

    Yoon, Ji Woong; Lee, Ji Sun; Lee, Sukyung; Cho, Kyoung Ho; Hwang, Young Kyu; Daturi, Marco; Jun, Chul-Ho; Krishna, Rajamani; Chang, Jong-San

    2015-12-01

    A reducible metal-organic framework (MOF), iron(III) trimesate, denoted as MIL-100(Fe), was investigated for the separation and purification of methane/ethane/ethylene/acetylene and an acetylene/CO2 mixtures by using sorption isotherms, breakthrough experiments, ideal adsorbed solution theory (IAST) calculations, and IR spectroscopic analysis. The MIL-100(Fe) showed high adsorption selectivity not only for acetylene and ethylene over methane and ethane, but also for acetylene over CO2 . The separation and purification of acetylene over ethylene was also possible for MIL-100(Fe) activated at 423 K. According to the data obtained from operando IR spectroscopy, the unsaturated Fe(III) sites and surface OH groups are mainly responsible for the successful separation of the acetylene/ethylene mixture, whereas the unsaturated Fe(II) sites have a detrimental effect on both separation and purification. The potential of MIL-100(Fe) for the separation of a mixture of C2 H2 /CO2 was also examined by using the IAST calculations and transient breakthrough simulations. Comparing the IAST selectivity calculations of C2 H2 /CO2 for four MOFs selected from the literature, the selectivity with MIL-100(Fe) was higher than those of CuBTC, ZJU-60a, and PCP-33, but lower than that of HOF-3. PMID:26515022

  16. Understanding and solving disorder in the substitution pattern of amino functionalized MIL-47(V).

    PubMed

    Heinen, Jurn; Dubbeldam, David

    2016-03-01

    Electronic energies and elastic constants of four amino functionalized MIL-47(V) supercells were computed using plane wave density functional theory to determine the influence of the substituent positions on the organic linker. An inverse relationship between the ab initio energies and the elastic constants was found, indicating that the high electronic stability correlates with high mechanical stability. Torsion in all supercells was induced upon substitution, which caused strain in the NH2-MIL-47(V) supercell. The combined effect of the substituent bulkiness and the induced torsion reduced the pore volume of the NH2-MIL-47(V) structures by >7% and the surface area by >14% with respect to MIL-47(V). This reduction was confirmed by lower saturation capacities of methane, CO2 and benzene. When unfavourable substituent positions are chosen, large torsions caused a further reduction of the saturation capacity. Differences in surface area, pore volume and saturation capacity illustrate the importance of choosing the correct NH2-MIL-47(V) supercell. PMID:26660395

  17. AgII doped MIL-101 and its adsorption of iodine with high speed in solution

    NASA Astrophysics Data System (ADS)

    Mao, Ping; Qi, Bingbing; Liu, Ying; Zhao, Lei; Jiao, Yan; Zhang, Yi; Jiang, Zheng; Li, Qiang; Wang, Jinfeng; Chen, Shouwen; Yang, Yi

    2016-05-01

    In order to improve the adsorption speed of iodine from water, MIL-101 with extra-large specific surface area (3054 m2/g) was chosen as a base material, and then, Ag was doped into MIL-101 to enhance its adsorption capacity through an incipient-wetness impregnation method. With the characterization of SEM-EDS, TEM, XRD, XPS, TGA, IR, and BET techniques, the resulting Ag was identified to be stay in the framework of MIL-101 stably in the form of AgII (generally, AgII cation is not stable). However, after the adsorption of I- anions, AgII stay in the cages of MIL-101 in the form of AgI/AgI3. It is important to note that, all adsorbents show high adsorption speed of iodine in solution. The equilibrium adsorption time of the adsorbents were acquired by only a few minutes, which can be attributed to its large BET surface area. An interesting note is that, when the doping amount of Ag is less than 9%, the iodine anions adsorption capacity of Ag@MIL-101 is greater than its theoretical adsorption capacity. It shows that both physical adsorption and chemical adsorption are existed in the adsorption process. This study hopefully leads to a new and highly efficient Ag-based adsorbent for iodide adsorb from solutions.

  18. Extending MIL-STD-1553 bandwidth: a study of impairments, EMI, and channel capacity

    NASA Astrophysics Data System (ADS)

    Hegarty, Michael G.

    2004-09-01

    This paper explores the possibility of increasing the data rates on existing MIL-STD-1553 networks beyond its current one megabit per second rate. A combination of empirical and theoretical methods is used in predicting the capacity of a MIL-STD-1553 network. The analysis begins with an assessment of the usable bandwidth in a 1553 network followed by the development of models to predict signal-to-noise ratios based on a transmit signal level that meets the emissions limits of MIL-STD-461 and a noise level that is representative of a real 1553 system. This paper presents the theoretical capacity limits for several 1553 network configurations. The results of the analysis predict that the theoretical capacity within a legacy MIL-STD-1553 system is expected to be several hundred megabits per second. The achievable rate depends on network configuration and usable bandwidth. Methods of approaching these theoretical capacity limits is not discussed in this paper, rather, this paper provides a framework and a baseline for the analysis of higher data rates over legacy MIL-STD-1553 networks.

  19. UT1760A RTS - A low-cost monolithic remote terminal stores interface for MIL-STD-1760A

    NASA Astrophysics Data System (ADS)

    Pressprich, John W.; Soques, Martin P.

    The paper presents a low-cost monolithic remote terminal stores interface (RTSI) for MIL-STD-1760A applications. The UT1760A RTS can significantly reduce the cost/space problem associated with applying MIL-STD-1553B within MIL-STD-1760A by integrating a dual redundant remote terminal interface and 16K of memory in one 68-pin device. The internal architecture of the part relieves the host from most data management tasks associated with MIL-STD-1553B processing by offering a use-defined RAM addressing scheme.

  20. New photocatalysts based on MIL-53 metal-organic frameworks for the decolorization of methylene blue dye.

    PubMed

    Du, Jing-Jing; Yuan, Yu-Peng; Sun, Jia-Xin; Peng, Fu-Min; Jiang, Xia; Qiu, Ling-Guang; Xie, An-Jian; Shen, Yu-Hua; Zhu, Jun-Fa

    2011-06-15

    The photocatalytic decolorization of methylene blue dye in aqueous solution using a novel photocatalyst MIL-53(Fe) metal-organic frameworks was investigated under UV-vis light and visible light irradiation. The effect of electron acceptor H(2)O(2), KBrO(3) and (NH(4))(2)S(2)O(8) addition on the photocatalytic performance of MIL-53(Fe) was also evaluated. The results show that MIL-53(Fe) photocatalyst exhibited photocatalytic activity for MB decolorization both under UV-vis light and visible light irradiation, and the MB decolorization over MIL-53(Fe) photocatalyst followed the first-order kinetics. The addition of different electron acceptors all enhances the photocatalytic performance of MIL-53(Fe) photocatalyst, and the enhanced rate follows the order of H(2)O(2)>(NH(4))(2)S(2)O(8)>KBrO(3) under UV-vis light irradiation, while in the order of (NH(4))(2)S(2)O(8)>H(2)O(2)>KBrO(3) under visible light irradiation. Moreover, MIL-53(Fe) did not exhibit any obvious loss of the activity for MB decolorization during five repeated usages. The photocatalytic activities over MIL-53(M) (M=Al, Fe), the isostructure to MIL-53(Fe), indicate that the metal centers show nil effect on the photocatalytic activity of MIL-53(M) photocatalysts. PMID:21531507

  1. Raster data transfer test using optigraphics produced data: MIL-R- 28002 Type 1 (Raster)

    SciTech Connect

    Not Available

    1990-06-14

    The DoD Computer-aided Acquisition and Logistics Support (CALS) Test Network (CTN) is conducting tests of the military standard for the Automated interchange of Technical Information, MIL-STD-1840A, and its companion suite of specifications. The primary purpose of the CTN is to evaluate the effectiveness of the CALS standards for technical data interchange and to demonstrate the capability and operational suitability of these standards. This test was conducted to allow Optigraphics to demonstrate their ability to generated a MIL-R-28002 file. The objective was to evaluate their interpretation of the MIL-R-28002 standard thereby assist the CTN in substantiating the validity of the standards or recommending changes to these standards and the references to national or international standards.

  2. Raster data transfer test using GTX produced data: MIL-R-28002 Type 1 (Raster)

    SciTech Connect

    Not Available

    1990-06-14

    The DoD Computer-aided Acquisition and Logistics Support (CALS) Test Network (CTN) is conducting tests of the military standard for the Automated interchange of Technical Information, MIL-STD-1840A, and its companion suite of specifications. The primary purpose of the CTN is to evaluate the effectiveness of the CALS standards for technical data interchange and to demonstrate the capability and operational suitability of these standards. This test was conducted to allow GTX to demonstrate their ability to generated a MIL-R-28002 data file. The objective was to evaluate their interpretation of the MIL-R-28002 standard thereby assist the CTN in substantiating the validity of the standards or recommending changes to these standards and the references to national or international standards.

  3. Modulation schemes and error-probability of MIL-STD-1773 fiber optic data bus

    NASA Astrophysics Data System (ADS)

    Yude, Ni; Jian, Wang; Zhang, Jian-Guo

    2005-11-01

    Based on the analysis of the MIL-STD-1773 data bus modulation scheme, two optical modulation schemes are proposed for designing this kind of data bus, namely, partial tri-level Manchester II bi-phase coding (PTMBC) and extended Manchester II bi-phase coding with beginning-stopping flags (EMBC-BSF), which can efficiently solve the problem related to three outputs at a MIL-STD-1773 optical receiver with low complexity. Then we focus on the analysis of error probability and optical receiver sensitivity for MIL-STD-1773 data buses with three modulation schemes of Manchester II bi-phase coding, PTMBC , and EMBC-BSF. The results show that both the PTMBC and EMBC-BSF modulation schemes have almost the identical and worse receiver sensitivity than that of the Manchester bi-level coding by ~3dB.

  4. The use of MIL-STD-188-141A in HF data networks

    NASA Astrophysics Data System (ADS)

    Baker, M.; Beamish, W.; Turner, M.

    HF data communication has become more reliable and user friendly with the advent of first-generation HF automatic link establishment (ALE) equipment. The newly released MIL-STD-188-141A established a more robust, flexible, and interoperable ALE protocol, and resulted in a second generation of ALE equipment. With the addition of a supervisory network controller to the ALE equipment, advanced networking capabilities can be fully automated. The authors examine a typical HF network node; communication responsibilities are allocated between the MIL-STD-188-141A ALE equipment and a supervisory network controller. MIL-STD-188-141A can furnish the OSI (Open Systems Interconnection) physical and data link layers for more sophisticated networking communication nodes. The real-world implementation of the two lowest OSI layers is found in ALE systems such as the RF-7200 Autolink II. The higher OSI layer can be implemented in a network controller, such as a personal computer.

  5. MIL-STD-1553 remote terminal design using ASIC megacell technology

    NASA Astrophysics Data System (ADS)

    Jordan, Anthony F.

    In the early development of MIL-STD-1553, board level implementations of remote terminals, bus controllers, and monitors were the norm. As technology progressed, hybrid solutions followed by monolithic solutions became the preferred solution of avionics design engineers implementing MIL-STD-1553 interfaces. Recent advances in ASIC technology allows the integration of complete MIL-STD-1553 interface into a silicon substrate along with a host microprocessor, memory, and support logic. The benefits of such a solution include reduced board space, increased flexibility, and higher reliability. A device with similar attributes was designed by Rockwell International, Rocketdyne Division, and manufactured by United Technologies Microelectronics Center (UTMC) for use on Space Station Freedom. This paper outlines the development and functionality of the ASIC device.

  6. Bivalent metal-based MIL-53 analogues: Synthesis, properties and application

    SciTech Connect

    Liu, Yongxin; Liu, Dan; Wang, Cheng

    2015-03-15

    Trivalent metal-based MIL-53 (Al{sup 3+}, Cr{sup 3+}, Fe{sup 3+}, In{sup 3+}) compounds are interesting metal–organic frameworks (MOFs) with breathing effect and are promising gas sorption materials. Replacing bridging μ{sub 2}-OH group by neutral ligands such as pyridine N-oxide and its derivatives (PNOs), the trivalent metal-based MIL-53 analogous structures could be extended to bivalent metal systems. The introduction of PNOs and bivalent metal elements endows the frameworks with new structural features and physical and chemical properties. This minireview summarizes the recent development of bivalent metal-based MIL-53 analogues (Mn{sup 2+}, Co{sup 2+}, Ni{sup 2+}), typically, focusing on the synthetic strategies and potential applications based on our own works and literatures. We present the synthetic strategy to achieve structures evolution from single-ligand-walled to double-ligand-walled channel. Properties and application of these new materials in a wide range of potential areas are discussed including thermal stability, gas adsorption, magnetism and liquid-phase separation. Promising directions of this research field are also highlighted. - Graphical abstract: The recent development of bivalent metal-based MIL-53 analogues (Mn{sup 2+}, Co{sup 2+}, Ni{sup 2+}) on their synthetic strategies, properties and potential applications was reviewed. - Highlights: • Structure features of bivalent metal-based MIL-53 analogues are illustrated. • Important properties and application are presented. • Host–guest interactions are main impetus for liquid-phase separation. • Promising directions of bivalent metal-based MIL-53 analogues are highlighted.

  7. Characterization of three types of silicon solar cells for SEPS deep-space missions. Volume 2: Current voltage characteristics of Solarex textured P(+)8 to 10 mil, planar P(+)8 to 10 mil and planar P(+)2 mil cells as a function of temperature and intensity

    NASA Technical Reports Server (NTRS)

    Whitaker, A. F.; Little, S. A.; Wooden, V. A.

    1980-01-01

    Three types of high performance silicon solar cells, textured P(+)8 to 10 mil, planar P(+)8 to 10 mil and planar P(+)2 mil were evaluated for their low temperature and low intensity (LTLI) performance. Sixteen cells of each type were subjected to 11 temperatures and 9 intensities. The textured P(+)8 to 10 mil cells provided the best performance both at 1 astronomical unit and at LTLI conditions. The average efficiencies of this cell were 14.5 percent at 1 solar constant/+25 C and 18.7 percent at 0.086 solar constant/-100 C.

  8. Comparison of Ultrasound with Tensile Testing of Thermally Damaged Polyimide Insulated Wiring (MIL-W-81381)

    NASA Astrophysics Data System (ADS)

    Madaras, Eric I.; Anastasi, Robert F.

    2003-03-01

    Ultrasonic measurements were performed on MIL-W-81381/7, /12, and /21 wire, a polyimide (Kapton®) insulated wire. The phase velocity for the 20-gauge MIL-W-81381/7 wire had a baseline value of 3023 ± 78 m/s. After exposure to high temperatures, the wire's phase velocity rapidly increased, and reached an asymptotic value of 3598 ± 20 m/s after 100 hours exposure. Similar responses were measured in other gauges. The baseline measurements of Young's moduli resulted in values of 5636 ± 486, 7714 ± 505, and 8767 ± 292 KSI for the 20 ga, 16 ga, and 12 ga. wires respectively.

  9. Experimental Evidence of Negative Linear Compressibility in the MIL-53 Metal-organic Framework Family

    SciTech Connect

    Serra-Crespo, Pablo; Dikhtiarenko, Alla; Stavitski, Eli; Juan-Alcaniz, Jana; Kapteijn, Freek; Coudert, Francois-Xavier; Gascon, Jorge

    2014-03-24

    Here we report a series of powder X-ray diffraction experiments performed on the soft porous crystals MIL-53(Al) and NH2-MIL-53(Al) in a diamond anvil cell under different pressurization media. Systematic refinements of the obtained powder patterns demonstrate that these materials expand along a specific direction while undergoing total volume reduction under an increasing hydrostatic pressure. Our results confirm for the first time the negative linear compressibility behaviour of this family of materials, recently predicted from quantum chemical calculations.

  10. Experimental Evidence of Negative Linear Compressibility in the MIL-53 Metal-Organic Framework Family

    SciTech Connect

    Serra-Crespo, Pablo; Dikhtiarenko, Alla; Stavitski, Eli; Juan-Alcaniz, Jana; Kapeteijn, Freek; Coudert, Francois-Xavier; Gascon, Jorge

    2014-03-24

    Here, we report a series of powder X-ray diffraction experiments performed on the soft porous crystals MIL-53(Al) and NH2-MIL-53(Al) in a diamond anvil cell under different pressurization media. Systematic refinements of the obtained powder patterns demonstrate that these materials expand along a specific direction while undergoing total volume reduction under an increasing hydrostatic pressure. Our results confirm for the first time the negative linear compressibility behaviour of this family of materials, recently predicted from quantum chemical calculations.

  11. The development of a standard electronic module with MIL-STD-1750A capabilities

    NASA Astrophysics Data System (ADS)

    Fischer, Joseph P.

    This paper describes the development of a standard size and function electronic module to meet the requirements of aircraft technology advances and future military aircraft avionic systems. The standard electronic module developed utilizes a MIL-STD-1750A central processing unit and is designed for applications requiring a general data processor. Design goals included MIL-STD-1750A compatibility, nonvolatile, high speed memory, memory management options, interfacing to a common bus backplane, the use of surface mount technology, application of new material and process techniques, and high speed I/O and direct memory access. Second generation development of this electronic module will incorporate VHSIC technology.

  12. Experimental Evidence of Negative Linear Compressibility in the MIL-53 Metal-Organic Framework Family

    PubMed Central

    Serra-Crespo, Pablo; Dikhtiarenko, Alla; Stavitski, Eli; Juan-Alcañiz, Jana; Kapteijn, Freek; Coudert, François-Xavier; Gascon, Jorge

    2014-01-01

    We report a series of powder X-ray diffraction experiments performed on the soft porous crystals MIL-53(Al) and NH2-MIL-53(Al) in a diamond anvil cell under different pressurization media. Systematic refinements of the obtained powder patterns demonstrate that these materials expand along a specific direction while undergoing total volume reduction under an increase in hydrostatic pressure. The results confirm for the first time the Negative Linear Compressibility behaviour of this family of materials recently predicted from quantum chemical calculations. PMID:25722647

  13. New monolithics shape the future MIL-STD-1553 to 1750A interfaces

    NASA Astrophysics Data System (ADS)

    Friedman, Steven N.

    The design and operation of interface hardware to link a MIL-STD-1750A computer with a MIL-STD-1553 data bus are described in detail and illustrated with diagrams, tables of numerical specifications, and a photograph. Particular attention is given to the use of custom monolithic LSI devices to reduce cost and power requirements and increase ruggedness and reliability. The system employs a memory-mapped dual-access RAM approach and comprises a BUS-65600 dual redundant remote terminal unit, a bus controller, a bus monitor, and a BUS 66300 microprocessor interface unit.

  14. Glucose recovery from aqueous solutions by adsorption in metal–organic framework MIL-101: a molecular simulation study

    PubMed Central

    Gupta, Krishna M.; Zhang, Kang; Jiang, Jianwen

    2015-01-01

    A molecular simulation study is reported on glucose recovery from aqueous solutions by adsorption in metal-organic framework MIL-101. The F atom of MIL-101 is identified to be the most favorable adsorption site. Among three MIL-101-X (X = H, NH2 or CH3), the parent MIL-101 exhibits the highest adsorption capacity and recovery efficacy. Upon functionalization by -NH2 or -CH3 group, the steric hindrance in MIL-101 increases; consequently, the interactions between glucose and framework become less attractive, thus reducing the capacity and mobility of glucose. The presence of ionic liquid, 1-ethyl-3-methyl-imidazolium acetate, as an impurity reduces the strength of hydrogen-bonding between glucose and MIL-101, and leads to lower capacity and mobility. Upon adding anti-solvent (ethanol or acetone), a similar adverse effect is observed. The simulation study provides useful structural and dynamic properties of glucose in MIL-101, and it suggests that MIL-101 might be a potential candidate for glucose recovery. PMID:26242874

  15. Glucose recovery from aqueous solutions by adsorption in metal-organic framework MIL-101: a molecular simulation study

    NASA Astrophysics Data System (ADS)

    Gupta, Krishna M.; Zhang, Kang; Jiang, Jianwen

    2015-08-01

    A molecular simulation study is reported on glucose recovery from aqueous solutions by adsorption in metal-organic framework MIL-101. The F atom of MIL-101 is identified to be the most favorable adsorption site. Among three MIL-101-X (X?=?H, NH2 or CH3), the parent MIL-101 exhibits the highest adsorption capacity and recovery efficacy. Upon functionalization by -NH2 or -CH3 group, the steric hindrance in MIL-101 increases; consequently, the interactions between glucose and framework become less attractive, thus reducing the capacity and mobility of glucose. The presence of ionic liquid, 1-ethyl-3-methyl-imidazolium acetate, as an impurity reduces the strength of hydrogen-bonding between glucose and MIL-101, and leads to lower capacity and mobility. Upon adding anti-solvent (ethanol or acetone), a similar adverse effect is observed. The simulation study provides useful structural and dynamic properties of glucose in MIL-101, and it suggests that MIL-101 might be a potential candidate for glucose recovery.

  16. Effect of synthesis solvent on the breathing behavior of MIL-53(Al).

    PubMed

    Mounfield, William P; Walton, Krista S

    2015-06-01

    This work reports the effect of using dimethylformamide (DMF) as the solvent for synthesizing MIL-53(Al). This well-known breathing MOF is typically prepared using hydrothermal methods. The two materials synthesized in DMF at 120°C and 220°C show significant deviations from the breathing behavior exhibited by the material synthesized hydrothermally. Powder X-ray diffraction confirmed that MIL-53(Al) synthesized in DMF at 120°C remains in the large-pore form under all conditions, while the other material synthesized at 220°C undergoes a more gradual breathing transition than is observed for MIL-53(Al) prepared by traditional methods. Solid-state NMR was employed to elucidate additional structural information and gain insight into the role synthesis solvent plays on breathing behavior. The CO2 and water adsorption of these large-pore stabilized materials were studied, and the differences in adsorption behavior compared to MIL-53(Al) prepared by traditional methods was discussed. PMID:25697686

  17. Facile fabrication of MIL-103(Eu) porous coordination polymer nanostructures and their sorption and sensing properties.

    PubMed

    Liu, Qing; Yang, Ji-Min; Guo, Fan; Jin, Li-Na; Sun, Wei-Yin

    2016-04-01

    Nano/microscale lanthanide porous coordination polymer MIL-103(Eu) [Eu(BTB)] (H3BTB = 4,4',4''-benzene-1,3,5-triyl-tribenzoic acid) crystals have been fabricated at room temperature by a facile, convenient and environmentally friendly method. The structures of the products were confirmed by powder X-ray diffraction, and the crystal morphologies, including microrods, nanorods and nanospheres, were characterized by scanning electron microscopy. It is found that the addition of sodium acetate and the concentration of the reactants have an important impact on the morphology and size of the MIL-103(Eu) crystals. Gas adsorption measurements reveal that the products show high specific surface areas among the rare earth based coordination polymers and the MIL-103(Eu) nanorods can selectively adsorb CO2 over N2 under ambient conditions. Furthermore, all the products exhibit red emission corresponding to the (5)D0→(7)F2 transition of the Eu(iii) ion, and MIL-103(Eu) nanorods display sensitive and selective sensing for Cu(ii) ions and acetone molecules in solution. PMID:26940895

  18. Mitochondrial DNA background modifies the bioenergetics of NARP/MILS ATP6 mutant cells

    PubMed Central

    D'Aurelio, M.; Vives-Bauza, C.; Davidson, M.M.; Manfredi, G.

    2010-01-01

    Mutations in the mitochondrial DNA (mtDNA) encoded subunit 6 of ATPase (ATP6) are associated with variable disease expression, ranging from adult onset neuropathy, ataxia and retinitis pigmentosa (NARP) to fatal childhood maternally inherited Leigh's syndrome (MILS). Phenotypical variations have largely been attributed to mtDNA heteroplasmy. However, there is often a discrepancy between the levels of mutant mtDNA and disease severity. Therefore, the correlation among genetic defect, bioenergetic impairment and clinical outcome in NARP/MILS remains to be elucidated. We investigated the bioenergetics of cybrids from five patients carrying different ATP6 mutations: three harboring the T8993G, one with the T8993C and one with the T9176G mutation. The bioenergetic defects varied dramatically, not only among different ATP6 mutants, but also among lines carrying the same T8993G mutation. Mutants with the most severe ATP synthesis impairment showed defective respiration and disassembly of respiratory chain complexes. This indicates that respiratory chain defects modulate the bioenergetic impairment in NARP/MILS cells. Sequencing of the entire mtDNA from the different mutant cell lines identified variations in structural genes, resulting in amino acid changes that destabilize the respiratory chain. Taken together, these results indicate that the mtDNA background plays an important role in modulating the biochemical defects and clinical outcome in NARP/MILS. PMID:19875463

  19. Mitochondrial DNA background modifies the bioenergetics of NARP/MILS ATP6 mutant cells.

    PubMed

    D'Aurelio, M; Vives-Bauza, C; Davidson, M M; Manfredi, G

    2010-01-15

    Mutations in the mitochondrial DNA (mtDNA) encoded subunit 6 of ATPase (ATP6) are associated with variable disease expression, ranging from adult onset neuropathy, ataxia and retinitis pigmentosa (NARP) to fatal childhood maternally inherited Leigh's syndrome (MILS). Phenotypical variations have largely been attributed to mtDNA heteroplasmy. However, there is often a discrepancy between the levels of mutant mtDNA and disease severity. Therefore, the correlation among genetic defect, bioenergetic impairment and clinical outcome in NARP/MILS remains to be elucidated. We investigated the bioenergetics of cybrids from five patients carrying different ATP6 mutations: three harboring the T8993G, one with the T8993C and one with the T9176G mutation. The bioenergetic defects varied dramatically, not only among different ATP6 mutants, but also among lines carrying the same T8993G mutation. Mutants with the most severe ATP synthesis impairment showed defective respiration and disassembly of respiratory chain complexes. This indicates that respiratory chain defects modulate the bioenergetic impairment in NARP/MILS cells. Sequencing of the entire mtDNA from the different mutant cell lines identified variations in structural genes, resulting in amino acid changes that destabilize the respiratory chain. Taken together, these results indicate that the mtDNA background plays an important role in modulating the biochemical defects and clinical outcome in NARP/MILS. PMID:19875463

  20. Variability in the performance of MIL-STD-810 sand testing

    NASA Astrophysics Data System (ADS)

    Jacoby, Keith T.

    2005-05-01

    Exotic Electro-Optics (EEO) recently completed a series of MIL-STD-810F, Method 510.4 sand erosion tests at multiple commercial testing sites. During this testing process, it became apparent that no two environmental test vendors are alike, even if MIL-STD-810F is specified in all cases. Three different test laboratories performing the same Method 510.4 sand test on identically fabricated samples yielded three different results. Ultimately, it is the responsibility of the Engineer to confirm that the test vendor"s equipment, processes, and procedures produce a test environment that is applicable and a result that is accurate based upon the customer specified test requirement and the MIL-STD-810 methodology. Some critical factors that determine the utility of a test are particle concentration, air velocity, particle size and composition, and the ability to maintain these parameters over test duration of up to 90 minutes. EEO has identified a number of parametric details critical to maximizing the stability and accuracy of MIL-STD-810F, Method 510.4, Procedure II sand testing. These strategies will be presented.

  1. Design considerations for MIL-STD-2179 recorders in a rugged environment

    NASA Astrophysics Data System (ADS)

    Hoff, Steve C.

    1993-02-01

    MIL-STD-2179 is based on D-1 technology which has been proven in the commercial TV industry for over ten years. Application of this technology, in a harsh military environment, has presented technical challenges not addressed in commercial designs. This paper addresses those special design obstacles as well as enhancements desirable for scientific data manipulation compared to fixed rate benign commercial applications.

  2. Tuning functional sites and thermal stability of mixed-linker MOFs based on MIL-53(Al).

    PubMed

    Marx, Stefan; Kleist, Wolfgang; Huang, Jun; Maciejewski, Marek; Baiker, Alfons

    2010-04-28

    The MIXMOF concept has been applied to the metal-organic framework compound MIL-53(Al). The random incorporation of two different linker molecules (benzene-1,4-dicarboxylate and 2-aminobenzene-1,4-dicarboxylate) in the framework structure and its influence on thermal stability were proven using several complementary techniques (XRD, ATR-IR, MAS-NMR and TG). PMID:20372702

  3. NH2-MIL-53(Al): a high-contrast reversible solid-state nonlinear optical switch.

    PubMed

    Serra-Crespo, Pablo; van der Veen, Monique A; Gobechiya, Elena; Houthoofd, Kristof; Filinchuk, Yaroslav; Kirschhock, Christine E A; Martens, Johan A; Sels, Bert F; De Vos, Dirk E; Kapteijn, Freek; Gascon, Jorge

    2012-05-23

    The metal-organic framework NH(2)-MIL-53(Al) is the first solid-state material displaying nonlinear optical switching due to a conformational change upon breathing. A switching contrast of at least 38 was observed. This transition originates in the restrained linker mobility in the very narrow pore configuration. PMID:22578194

  4. MIL-L-87177 and CLT:X-10 Lubricants Improve Electrical Connector Fretting Corrosion Behavior

    SciTech Connect

    AUKLAND,NEIL R.; HANLON,JAMES T.

    1999-10-12

    We have conducted a fretting research project using MIL-L-87177 and CLT: X-10 lubricants on Nano-miniature connectors. When they were fretted without lubricant, individual connectors first exceeded our 0.5 ohm failure criteria from 2,341 to 45,238 fretting cycles. With additional fretting, their contact resistance increased to more than 100,000 ohms. Unmodified MIL-L-87177 lubricant delayed the onset of first failure to between 430,000 and over 20,000,000 fretting cycles. MIL-L-87177 modified by addition of Teflon powder delayed first failure to beyond 5 million fretting cycles. Best results were obtained when Teflon was used and also when both the straight and modified lubricants were poured into and then out of the connector. CLT: X-10 lubricant delayed the onset of first failure to beyond 55 million cycles in one test where a failure was actually observed and to beyond 20 million cycles in another that was terminated without failure. CLT: X-10 recovered an unlubricated connector driven deeply into failure, with six failed pins recovering immediately and four more recovering during an additional 420 thousand fretting cycles. MIL-L-87177 was not able to recover a connector under similar conditions.

  5. Fibroblast transformation parameters induced by the avian v-mil oncogene.

    PubMed Central

    Palmieri, S; Vogel, M L

    1987-01-01

    An avian retrovirus containing only the v-mil oncogene (PA200-MH2) was analyzed for its ability to induce a transformed phenotype in chicken embryo fibroblasts. Infected cultures exhibited an altered morphology, disarranged actin cable filaments, and a decrease in the amount of cell surface fibronectin. In addition, these cells showed a high level of plasminogen activator protease activity and were also capable of growth in low serum concentrations. In contrast, PA200-MH2 was very inefficient at inducing foci under agar and colonies in semisolid medium relative to the Mill Hill 2 and Rous sarcoma viruses. This inefficiency was further reflected in vivo by the total inability of PA200-MH2 to induce wing tumors in young birds. However, 40% of the birds inoculated in the wing web with PA200-MH2-infected cells did develop slow-growing tumors at the site of injection, with no evidence of hematopoietic involvement. Our results indicate that the v-mil oncogene is transforming both in vitro and in vivo and that each of the oncogenes in the Mill Hill 2 virus, v-mil and v-myc, can independently transform fibroblasts. These data suggest that v-mil is functionally related to its homologous murine counterpart, v-raf, which also transforms fibroblasts. Images PMID:3573149

  6. MIL-STD-1553 VLSI components supports a variety of multiplex applications

    NASA Astrophysics Data System (ADS)

    Friedman, Steven N.

    The performance as well as the physical and electrical characteristics of a series of new VLSI components are described. These devices are capable of supporting MIL-STD-1553 and a variety of computer/microprocessor based subsystems. VSLI features such as size, packaging options, radiation hardness, and power and reliability considerations are discussed.

  7. Application of a textural geospeedometer to the late-stage magmatic history of MIL 03346

    NASA Astrophysics Data System (ADS)

    Hammer, J. E.

    2009-03-01

    Dynamic crystallization experiments performed on Fe-rich, Al-poor basalt are employed as a textural calibration set to quantify the late-stage igneous history of nakhlite Miller Range (MIL) 03346. The ratio of crystal-melt surface area to volume typifying morphologically distinct populations of Ca-pyroxene has been shown to vary as a strong function of cooling rate (Hammer 2006). Furthermore, a texture of phenocrysts surrounded by finer-grained groundmass crystals arises by sequential nucleation events during constant-rate cooling, but multiple populations nucleate only if the cooling rate is ≤72 °C h-1. Textural analysis of meteorite MIL 03346 reveals at least two distinct populations. The Ca-pyroxene phenocryst and microphenocryst three dimensional (3D) aspect ratios are 112 ± 8.3 and 1530 ± 160 mm-1, respectively. By comparison with the calibration set, the range of cooling rates consistent with 3D aspect ratios of both populations in MIL 03346 is ˜20 °C h-1. An additional experiment was performed approximating a conductive heat transfer profile in order to interpret and apply results of constant-rate cooling experiments to the natural cooling of magma. Results suggest that the textures of constant-rate experiments parallel the initial period of rapid cooling in natural magma. Initial cooling rates of ˜20 °C h-1 in the lava hosting MIL 03346 occur in conductively solidifying lava at depths of ˜0.4 m, constraining the minimum total thickness to ≥0.8 m. Crystal accumulation beginning in a subsurface reservoir and continuing after lava emplacement as an inflated pahoehoe sheet satisfies all textural constraints on the late-stage igneous history of MIL 03346.

  8. Comparative Study of MIL-96(Al) as Continuous Metal-Organic Frameworks Layer and Mixed-Matrix Membrane.

    PubMed

    Knebel, Alexander; Friebe, Sebastian; Bigall, Nadja Carola; Benzaqui, Marvin; Serre, Christian; Caro, Jürgen

    2016-03-23

    MIL-96(Al) layers were prepared as supported metal-organic frameworks membrane via reactive seeding using the α-alumina support as the Al source for the formation of the MIL-96(Al) seeds. Depending on the solvent mixture employed during seed formation, two different crystal morphologies, with different orientation of the transport-active channels, have been formed. This crystal orientation and habit is predefined by the seed crystals and is kept in the subsequent growth of the seeds to continuous layers. In the gas separation of an equimolar H2/CO2 mixture, the hydrogen permeability of the two supported MIL-96(Al) layers was found to be highly dependent on the crystal morphology and the accompanied channel orientation in the layer. In addition to the neat supported MIL-96(Al) membrane layers, mixed-matrix membranes (MMMs, 10 wt % filler loading) as a composite of MIL-96(Al) particles as filler in a continuous Matrimid polymer phase have been prepared. Five particle sizes of MIL-96(Al) between 3.2 μm and 55 nm were synthesized. In the preparation of the MIL-96(Al)/Matrimid MMM (10 wt % filler loading), the following preparation problems have been identified: The bigger micrometer-sized MIL-96(Al) crystals show a trend toward sedimentation during casting of the MMM, whereas for nanoparticles aggregation and recrystallization to micrometer-sized MIL-96(Al) crystals has been observed. Because of these preparation problems for MMM, the neat supported MIL-96(Al) layers show a relatively high H2/CO2 selectivity (≈9) and a hydrogen permeance approximately 2 magnitudes higher than that of the best MMM. PMID:26886432

  9. Ionic liquid@MIL-101 prepared via the ship-in-bottle technique: remarkable adsorbents for the removal of benzothiophene from liquid fuel.

    PubMed

    Khan, Nazmul Abedin; Hasan, Zubair; Jhung, Sung Hwa

    2016-02-11

    Ionic liquids (ILs) were synthesized inside a porous metal-organic framework (MIL-101) via a ship-in-bottle (SIB) technique. Unlike previously reported IL-incorporated MIL-101s, IL@MIL-101 prepared by the SIB approach was very stable over several cycles for the liquid phase adsorption of benzothiophene from liquid fuel. PMID:26744746

  10. Size-controlled silver nanoparticles stabilized on thiol-functionalized MIL-53(Al) frameworks

    NASA Astrophysics Data System (ADS)

    Cheng, Xinquan; Liu, Min; Zhang, Anfeng; Hu, Shen; Song, Chunshan; Zhang, Guoliang; Guo, Xinwen

    2015-05-01

    A postsynthetic modification method was used to prepare thiol-functionalized metal-organic frameworks (MOFs) by the amidation of mercaptoacetic acid with the amine group, which is present in the frameworks of NH2-MIL-53(Al). By doing this, the thiol group has been successfully grafted on the MOF, which perfectly combined the highly developed pore structures of the MOF with the strong coordination ability of the thiol group. The resulting thiol-functionalized MIL-53(Al) showed a significantly high adsorption capacity for heavy metal ions like Ag+ (182.8 mg g-1). Even more importantly, these grafted thiol groups can be used as anchoring groups for stabilizing metal nanoparticles (NPs) with controllable sizes. Taking silver as an example, monodispersed Ag NPs encapsulated in the cages of MIL-53(Al) have been prepared by using a two-step procedure. In addition, the particle size of the Ag NPs was adjustable to some extent by controlling the initial loading amount. The average size of the smallest Ag NPs is 3.9 +/- 0.9 nm, which is hard to obtain for Ag NPs because of their strong tendency to aggregate.A postsynthetic modification method was used to prepare thiol-functionalized metal-organic frameworks (MOFs) by the amidation of mercaptoacetic acid with the amine group, which is present in the frameworks of NH2-MIL-53(Al). By doing this, the thiol group has been successfully grafted on the MOF, which perfectly combined the highly developed pore structures of the MOF with the strong coordination ability of the thiol group. The resulting thiol-functionalized MIL-53(Al) showed a significantly high adsorption capacity for heavy metal ions like Ag+ (182.8 mg g-1). Even more importantly, these grafted thiol groups can be used as anchoring groups for stabilizing metal nanoparticles (NPs) with controllable sizes. Taking silver as an example, monodispersed Ag NPs encapsulated in the cages of MIL-53(Al) have been prepared by using a two-step procedure. In addition, the particle size of the Ag NPs was adjustable to some extent by controlling the initial loading amount. The average size of the smallest Ag NPs is 3.9 +/- 0.9 nm, which is hard to obtain for Ag NPs because of their strong tendency to aggregate. Electronic supplementary information (ESI) available: Nitrogen and argon adsorption/desorption isotherms, TG and DTG curves, UV-vis diffuse reflectance spectra, temperature dependent XRD patterns, and XRD patterns. See DOI: 10.1039/c5nr01292a

  11. Novel thymine-functionalized MIL-101 prepared by post-synthesis and enhanced removal of Hg(2+) from water.

    PubMed

    Luo, Xubiao; Shen, Tingting; Ding, Lin; Zhong, Weiping; Luo, Jianfeng; Luo, Shenglian

    2016-04-01

    A novel thymine-functionalized MIL-101 (MIL-101-Thymine) material was synthesized using a post-synthesis method to remove mercury at a high efficiency. MIL-101-Thymine was successfully prepared in this work and was confirmed by several characterization methods, such as (13)C nuclear magnetic resonance, X-ray diffraction, and infrared spectroscopy. The Hg(2+) adsorption agreed well with the Langmuir model, and the maximum adsorption capacity was 51.27mg/g. The adsorption rate fit with the pseudo-second-order kinetic model. Furthermore, MIL-101-Thymine exhibited excellent selectivity towards Hg(2+) over other cations, and the maximum value of the selective coefficient reached 947.34; this result is very likely due to the highly selective interactions of T-Hg(2+)-T in MIL-101-Thymine. The result of X-ray photoelectron spectroscopy also showed that Hg(2+) was coordinated with the N of thymine in MIL-101-Thymine. Moreover, the results of the thermogravimetric analysis and adsorption experiments showed that the Hg atom was two-coordinated with the thymine group. MIL-101-Thymine was used to remove trace Hg(2+) in real water samples, and satisfactory recoveries were obtained. PMID:26774986

  12. The metal-organic framework MIL-53(Al) constructed from multiple metal sources: alumina, aluminum hydroxide, and boehmite.

    PubMed

    Li, Zehua; Wu, Yi-nan; Li, Jie; Zhang, Yiming; Zou, Xin; Li, Fengting

    2015-04-27

    Three aluminum compounds, namely alumina, aluminum hydroxide, and boehmite, are probed as the metal sources for the hydrothermal synthesis of a typical metal-organic framework MIL-53(Al). The process exhibits enhanced synthetic efficiency without the generation of strongly acidic byproducts. The time-course monitoring of conversion from different aluminum sources into MIL-53(Al) is achieved by multiple characterization that reveals a similar but differentiated crystallinity, porosity, and morphology relative to typical MIL-53(Al) prepared from water-soluble aluminum salts. Moreover, the prepared MIL-53(Al) constructed with the three insoluble aluminum sources exhibit an improved thermal stability of up to nearly 600 °C and enhanced yields. Alumina and boehmite are more preferable than aluminum hydroxide in terms of product porosity, yield, and reaction time. The adsorption performances of a typical environmental endocrine disruptor, dimethyl phthalate, on the prepared MIL-53(Al) samples are also investigated. The improved structural stability of MIL-53(Al) prepared from these alternative aluminum sources enables double-enhanced adsorption performance (up to 206 mg g(-1)) relative to the conventionally obtained MIL-53(Al). PMID:25756851

  13. Inhibitory effect of MIL glycoprotein on expression of pro-inflammatory mediators in carbon tetrachloride-induced mice liver damage.

    PubMed

    Oh, Phil-Sun; Lee, Jin; Lim, Kye-Taek

    2010-11-01

    The aim of the present study was to evaluate immunomodulatory and hepatoprotective effects of glycoprotein isolated from Morus indica Linne (MIL glycoprotein) on carbon tetrachloride (CCl(4) )-induced liver injury. In the present study, MIL glycoprotein (5 and 10 mg?kg(-1) body weight) was administered to ICR mice for 7 days prior to CCl(4) treatment. We evaluated the activities of alanine aminotransferase (ALT), lactate dehydrogenase (LDH), and thiobarbituric acid-reactive substances (TBARS), and expression of inflammation-related mediators including cyclooxygenase (COX)-2, tumor necrosis factor (TNF)-?, and interleukin (IL)-1 beta in CCl(4) -treated mice. Our results revealed that MIL glycoprotein reduced the activities of ALT, LDH and TBARS in serum from CCl(4) -treated mice. We also found that MIL glycoprotein reduced the activity of COX-2 and expression of TNF-? and IL-1 beta in liver from CCl(4) -treated mice. Moreover, administration of MIL glycoprotein suppressed on stress-activated protein kinase/c-jun N-terminal kinase phosphorylation and activator protein-1 transcriptional activation in livers from CCl(4) -treated mice. The results from these experiments indicate that MIL glycoprotein effectively protects against liver injury, mainly through downregulation of oxidative stress and the inflammatory response. In conclusion, we suggest that the MIL glycoprotein might be one component of health supplements for prevention of liver diseases. PMID:20589743

  14. Comparison of Ultrasound with Tensile Testing of Thermally Damaged Polyimide Insulated Wiring (MIL-W-81381)

    NASA Technical Reports Server (NTRS)

    Madaras, Eric I.; Anastasi, Robert F.

    2002-01-01

    Ultrasonic measurements were performed on MIL-W-81381/7, /12, and /21 wire, a polyimide (Kapton) insulated wire. The phase velocity for the 20-gauge MIL-W-81381/7 wire had a baseline value of 3023 plus or minus 78 m/s. After exposure to high temperatures, the wire's phase velocity rapidly increased, and reached an asymptotic value of 3598 plus or minus 20 m/s after 100 hours exposure. Similar responses were measured in other gauges. The baseline measurements of Young's moduli resulted in values of 5636 plus or minus 486, 7714 plus or minus 505, and 8767 plus or minus 292 KSI for the 20 ga, 16 ga, and 12 ga. wires respectively.

  15. Ambient pressure synthesis of MIL-100(Fe) MOF from homogeneous solution using a redox pathway.

    PubMed

    Jeremias, Felix; Henninger, Stefan K; Janiak, Christoph

    2016-05-17

    Micro- to mesoporous iron(iii) trimesate MIL-100(Fe) is a MOF of high interest for numerous applications. With regard to large-scale synthesis, e.g., by continuous flow or the in situ deposition of coatings, a replacement for the conventional, hydrothermal low-yield fluoride-containing synthesis is desirable. In this contribution, we present a method to synthesize crystalline fluoride-free MIL-100(Fe) from iron(iii) nitrate and trimesic acid in zeotropic DMSO/water solution at normal ambient pressure involving a DMSO-nitrate redox pathway. Yields of 72%, surface areas of SBET = 1791 m(2) g(-1) and pore volumes of Vpore = 0.82 cm(3) g(-1) were achieved. PMID:27143562

  16. MIL-STDS and PTTI: What's available and what needs to be done

    NASA Technical Reports Server (NTRS)

    Murray, James A.; White, Joseph D.

    1993-01-01

    The systems developer who needs Precise Time and Time Interval (PTTI) capability has relatively little guidance in the form of military standards, particularly for systems using atomic clocks or other sources of very precise time and frequency. The existing standards, including MIL-STD-188-115, MIL-F-2991(EC), and DOD-STD-1399 are discussed. These documents were written several years ago and do not always reflect current practice or take advantage of more recent technology improvements. User needs have also changed over the years and some of those needs such as more detailed time codes are not being met. We will summarize what's available and what's good and bad about it. The second part will make suggestions about what should be done in the future to promote and facilitate good PTTI design practice. Topics will include clock performance parameters, environmental considerations, time codes, signal isolation, and time dissemination.

  17. Effect of adsorbent history on adsorption characteristics of MIL-53(Al) metal organic framework.

    PubMed

    Mishra, Prashant; Edubilli, Satyannarayana; Uppara, Hari Prasad; Mandal, Bishnupada; Gumma, Sasidhar

    2013-10-01

    Structural transformation of MIL-53(Al) metal organic framework from large pore to narrow pore form (lp → np) or vice versa is known to occur by adsorption of certain guest molecules, by temperature change or by applying mechanical pressure. In this work, we perform a systematic investigation to demonstrate that adsorbent history also plays a decisive role in the structural transitions of this material (and hence on its adsorption characteristics). By changing the adsorbent history, parent MIL-53(Al) is tuned into its np domain at ambient temperature such that it not only exhibits a significant increase in CO2 capacity, but also shows negligible uptake for CH4, N2, CO, and O2 at subatmospheric pressure. In addition, for the high pressure region (1-8 bar), we propose a method to retain the lp form of the sample to enhance its CO2 uptake. PMID:24006856

  18. MIL-STD-1553B Marconi LSI chip set in a remote terminal application

    NASA Astrophysics Data System (ADS)

    Dimarino, A.

    1982-11-01

    Marconi Avionics is utilizing the MIL-STD-1553B LSI Chip Set in the SCADC Air Data Computer application to perform all of the required remote terminal MIL-STD-1553B protocol functions. Basic components of the RTU are the dual redundant chip set, CT3231 Transceivers, 256 x 16 RAM and a Z8002 microprocessor. Basic transfers are to/from the RAM command of the bus controller or Z8002 processor. During transfers from the processor to the RAM, the chip set busy bit is set for a period not exceeding 250 microseconds. When the transfer is complete, the busy bit is released and transfers to the data bus occur on command. The LSI Chip Set word count lines are used to locate each data word in the local memory and 4 mode codes are used in the application: reset remote terminal, transmit status word, transmitter shut-down, and override transmitter shutdown.

  19. MIL-STD-1553 programmable dual redundant remote terminal, bus controller, bus monitor, unit

    NASA Astrophysics Data System (ADS)

    Friedman, S. N.

    The performance, physical and electrical characteristics of the BUS-65600 Superhybrid are described. The Superhybrid is a programmable, fully compliant MIL-STD-1553 Dual Redundant Remote Terminal Unit (RTU), BUS Controller (BC) or BUS Monitor (BM). It requires the BUS-63125 Dual Redundant Monolithic Hybrid Transceiver or two BUS-63102 Universal Transceivers for MIL-STD-1553B or McAir sinusoidal applications. A discussion of the custom Monolithic LSI components implemented in the Superhybrid is included. The special features and capabilities are highlighted, along with special programming options which facilitate a broad array of applications. The BUS-65600 Superhybrid has a Direct Memory Access (DMA) Computer Interface plus necessary control lines which are also described in detail.

  20. Evaluating Thermally Damaged Polyimide Insulated Wiring (MIL-W-81381) with Ultrasound

    NASA Technical Reports Server (NTRS)

    Madaras, Eric I.; Anastasi, Robert F.

    2002-01-01

    A series of experiments to investigate the use of ultrasound for measuring wire insulation have been conducted. Initial laboratory tests were performed on MIL-W-81381/7,/12, and /21 aviation wire, a wire that has polyimide (Kapton Registered Trademark) layers for insulation. Samples of this wiring were exposed to 370C temperatures for different periods of time to induce a range of thermal damage. For each exposure, 12 samples of each gauge (12, 16, and 20 gauges) were processed. The velocity of the lowest order axisymmetric ultrasonic guided mode, a mode that is sensitive to the geometry and stiffness of the wire conductor and insulation, was measured. The phase velocity for the 20-gauge MIL-W-81381/7 wire had a baseline value of 3023 +/- 78 m/s. After exposure to the high temperatures, the wire's phase velocity rapidly increased, and reached an asymptotic value of 3598 +/- 20 m/s after 100 hours exposure. Similar behavior was measured for the 16 gauge MIL-W-81381/21 wire and 12 gauge MIL-W-81381/12 wire which had baseline values of 3225 +/- 22 m/s and 3403 +/- 33 m/s respectively, and reached asymptotic values of 3668 +/- 19 m/s, and 3679 +/- 42 m/s respectively. These measured velocity changes represent changes of 19, 14, and 8 percent respectively for the 20, 16, and 12 gauge wires. Finally, some results for a wire with an ethylene tetrafluoroethylene insulation are reported. Qualitatively similar behaviors are noted ultrasonically.

  1. Development of an automated system for MIL-STD-461 EMI testing

    NASA Astrophysics Data System (ADS)

    Canaga, K. W.; Nakagawa, K. K.

    This paper discusses the development of an automated MIL-STD-461 EMI measurement system and some of the lessons learned in the process. The system hardware and software are described, and the tradeoffs associated with the various configuration and design choices are discussed. Problems occurring in the change from manual to automated EMI measurements are discussed, along with the solutions employed with this particular system.

  2. Military standards and SCATHA program update of MIL-STD-1541

    NASA Technical Reports Server (NTRS)

    Frankos, D. T.

    1980-01-01

    The elctromagnetic compatability requirements for space systems, 15 October 1973, to be met by industry contractors for spacecraft launch vehicles and other special space systems, are considered. Deficiencies in the existing standard with respect to spacecraft charge and discharge phenomena, the technical ramifications for generating a new standard, and the upgrading of MIL-STD-1541 with requirements supplied as a result of the SCATHA program are discussed.

  3. Interface For Dual-Channel MIL-STD-1553 Data Bus

    NASA Technical Reports Server (NTRS)

    Davies, Bryan L.; Heaps, Timothy L.

    1992-01-01

    Digital electronic subsystem made of commercially available programmable logic arrays and discrete logic devices serves as interface between microprocessor and dual-channel MIL-STD-1553 data bus. Subsystem consumes only 800 mW of power. Provides flexibility in that it is controllable via firmware. Includes only two reading-and-writing ports: one for status and control signals, other for transmission and reception of data.

  4. Bus length and loading limits of MIL-STD-1553 buses

    NASA Astrophysics Data System (ADS)

    Briscoe, W. G.; Davila, Manuel; Skinner, Brian

    Tests performed on bus configurations having bus lengths up to 300 ft and up to 32 bus terminals are described. The tests involved the use of 8-stub couplers on the bus as well as the usual single stub couplers. Waveform photographs are provided for the various bus configurations and practical cable length and loading limits of MIL-STD-1553B buses are formulated.

  5. Raster data transfer test using Formtek produced data: MIL-R-28002 Type 1 (Raster)

    SciTech Connect

    Not Available

    1990-06-14

    The DoD Computer-aided Acquisition and Logistics Support (CALS) Test Network (CTN) is conducting tests of the military standard for the Automated interchange of Technical Information, MIL-STD-1804A, and its companion suite of specifications. The CTN is a DoD sponsored confederation of voluntary participants from industry and government, managed by the Air Force Logistics Command. The primary purpose of the CTN is to evaluate the effectiveness of the CALS standards for technical data interchange and to demonstrate the capability and operational suitability of these standards. To this end, testing should represent the systems and applications in use by a large number of participants. Sampling a wide cross section of industry and government will gain feedback on the various interpretations of the standards and broaden the base of industry participation in the CALS initiative. This test was conducted to allow Formtek to demonstrate their ability to generated a MIL-R-28002 data file. The objective was to evaluate their interpretation of the MIL-R-28002 standard thereby assist the CTN in substantiating the validity of the standards or recommending changes to these standards and the references to national or international standards. Additionally, Quick Short Test Reports (QSTRs) are intended to promote industry and government participation in the CALS initiative, developing a level of confidence in the technology and furthering mission objectives.

  6. Development of dual-rate MIL-STD-1773A data bus transceiver

    NASA Astrophysics Data System (ADS)

    Bonebright, Rodney K.; Kim, Jae H.; Hughes, Rod; Clement, Jay W.; Bocek, Thomas M.; Chan, Eric Y.; Nitardy, John H.; Hong, Chi-Shain

    1996-10-01

    Boeing has first developed a space-qualifiable, radiation- hardened, dual-rate MIL-STD-1773A fiber-optic transceiver for military command/response time division multiplexed data bus applications. This will provide an enhancement path from a fixed low data rate MIL-STD-1553 bus to a high data rate MIL-STD-1773 bus with minor modification of terminals supporting the existing function. The transceiver operates at dual-rates of both 1 and 20 Mbps over temperature (minus 25 to plus 85 degrees Celsius), and it shows a large dynamic range of greater than 20 dB in support of 32-node star network; a sensitivity of up to minus 38.7 dBm and a saturation of minus 16.1 dBm (limited mainly by test source power) at BER less than or equal to 1 multiplied by 10-10. These transceivers are currently being utilized for space and military applications at DARPA, NASA, and JPL. In this paper we describe the dual-rate transceiver design requirements, ASIC and hybrid design, and performance test results.

  7. Bivalent metal-based MIL-53 analogues: Synthesis, properties and application

    NASA Astrophysics Data System (ADS)

    Liu, Yongxin; Liu, Dan; Wang, Cheng

    2015-03-01

    Trivalent metal-based MIL-53 (Al3+, Cr3+, Fe3+, In3+) compounds are interesting metal-organic frameworks (MOFs) with breathing effect and are promising gas sorption materials. Replacing bridging μ2-OH group by neutral ligands such as pyridine N-oxide and its derivatives (PNOs), the trivalent metal-based MIL-53 analogous structures could be extended to bivalent metal systems. The introduction of PNOs and bivalent metal elements endows the frameworks with new structural features and physical and chemical properties. This minireview summarizes the recent development of bivalent metal-based MIL-53 analogues (Mn2+, Co2+, Ni2+), typically, focusing on the synthetic strategies and potential applications based on our own works and literatures. We present the synthetic strategy to achieve structures evolution from single-ligand-walled to double-ligand-walled channel. Properties and application of these new materials in a wide range of potential areas are discussed including thermal stability, gas adsorption, magnetism and liquid-phase separation. Promising directions of this research field are also highlighted.

  8. Size-controlled silver nanoparticles stabilized on thiol-functionalized MIL-53(Al) frameworks.

    PubMed

    Cheng, Xinquan; Liu, Min; Zhang, Anfeng; Hu, Shen; Song, Chunshan; Zhang, Guoliang; Guo, Xinwen

    2015-06-01

    A postsynthetic modification method was used to prepare thiol-functionalized metal-organic frameworks (MOFs) by the amidation of mercaptoacetic acid with the amine group, which is present in the frameworks of NH2-MIL-53(Al). By doing this, the thiol group has been successfully grafted on the MOF, which perfectly combined the highly developed pore structures of the MOF with the strong coordination ability of the thiol group. The resulting thiol-functionalized MIL-53(Al) showed a significantly high adsorption capacity for heavy metal ions like Ag(+) (182.8 mg g(-1)). Even more importantly, these grafted thiol groups can be used as anchoring groups for stabilizing metal nanoparticles (NPs) with controllable sizes. Taking silver as an example, monodispersed Ag NPs encapsulated in the cages of MIL-53(Al) have been prepared by using a two-step procedure. In addition, the particle size of the Ag NPs was adjustable to some extent by controlling the initial loading amount. The average size of the smallest Ag NPs is 3.9 ± 0.9 nm, which is hard to obtain for Ag NPs because of their strong tendency to aggregate. PMID:25963664

  9. An amine-functionalized MIL-53 metal-organic framework with large separation power for CO2 and CH4.

    PubMed

    Couck, Sarah; Denayer, Joeri F M; Baron, Gino V; Rémy, Tom; Gascon, Jorge; Kapteijn, Freek

    2009-05-13

    Functionalizing the well-known MIL-53(Al) metal-organic framework with amino groups increases its selectivity in CO(2)/CH(4) separations by orders of magnitude while maintaining a very high capacity for CO(2) capture. PMID:19374416

  10. Four-Channel PC/104 MIL-STD-1553 Circuit Board

    NASA Technical Reports Server (NTRS)

    Cox, Gary L.

    2004-01-01

    The mini bus interface card (miniBIC) is the first four-channel electronic circuit board that conforms to MIL-STD-1553 and to the electrical-footprint portion of PC/104. [MIL-STD-1553 is a military standard that encompasses a method of communication and electrical- interface requirements for digital electronic subsystems connected to a data bus. PC/104 is an industry standard for compact, stackable modules that are fully compatible (in architecture, hardware, and software) with personal-computer data- and power-bus circuitry.] Prior to the development of the miniBIC, only one- and two-channel PC/104 MIL-STD-1553 boards were available. To obtain four channels, it was necessary to include at least two boards in a PC/104 stack. In comparison with such a two-board stack, the miniBIC takes up less space, consumes less power, and is more reliable. In addition, the miniBIC includes 32 digital input/output channels. The miniBIC (see figure) contains four MIL-STD-1553B hybrid integrated circuits (ICs), four transformers, a field-programmable gate array (FPGA), and an Industry Standard Architecture (ISA) interface. Each hybrid IC includes a MILSTD-1553 dual transceiver, memory-management circuitry, processor interface logic circuitry, and 64Kx16 bits of shared static random access memory. The memory is used to configure message and data blocks. In addition, 23 16-bit registers are available for (1) configuring the hybrid IC for, and starting it in, various modes of operation; (2) reading the status of the functionality of the hybrid IC; and (3) resetting the hybrid IC to a known state. The miniBIC can operate as a remote terminal, bus controller, or bus monitor. The FPGA provides the chip-select and data-strobe signals needed for operation of the hybrid ICs. The FPGA also receives interruption signals and forwards them to the ISA bus. The ISA interface connects the address, data, and control interfaces of the hybrid ICs to the ISA backplane. Each channel is, in effect, a MIL-STD-1553 interface that can operate either independently of the others or else as a redundant version of one of the others. The transformer in each channel provides electrical isolation between the rest of the miniBIC circuitry and the bus to which that channel is connected.

  11. A rationale for the large breathing of the porous aluminum terephthalate (MIL-53) upon hydration.

    PubMed

    Loiseau, Thierry; Serre, Christian; Huguenard, Clarisse; Fink, Gerhard; Taulelle, Francis; Henry, Marc; Bataille, Thierry; Férey, Gérard

    2004-03-19

    Aluminum 1,4-benzenedicarboxylate Al(OH)[O(2)C-C(6)H(4)-CO(2)]. [HO(2)C-C(6)H(4)-CO(2)H](0.70) or MIL-53 as (Al) has been hydrothermally synthesized by heating a mixture of aluminum nitrate, 1,4-benzenedicarboxylic acid, and water, for three days at 220 degrees C. Its 3 D framework is built up of infinite trans chains of corner-sharing AlO(4)(OH)(2) octahedra. The chains are interconnected by the 1,4-benzenedicarboxylate groups, creating 1 D rhombic-shaped tunnels. Disordered 1,4-benzenedicarboxylic acid molecules are trapped inside these tunnels. Their evacuation upon heating, between 275 and 420 degrees C, leads to a nanoporous open-framework (MIL-53 ht (Al) or Al(OH)[O(2)C-C(6)H(4)-CO(2)]) with empty pores of diameter 8.5 A. This solid exhibits a Langmuir surface area of 1590(1) m(2)g(-1) together with a remarkable thermal stability, since it starts to decompose only at 500 degrees C. At room temperature, the solid reversibly absorbs water in its tunnels, causing a very large breathing effect and shrinkage of the pores. Analysis of the hydration process by solid-state NMR ((1)H, (13)C, (27)Al) has clearly indicated that the trapped water molecules interact with the carboxylate groups through hydrogen bonds, but do not affect the hydroxyl species bridging the aluminum atoms. The hydrogen bonds between water and the oxygen atoms of the framework are responsible for the contraction of the rhombic channels. The structures of the three forms have been determined by means of powder X-ray diffraction analysis. Crystal data for MIL-53 as (Al) are as follows: orthorhombic system, Pnma (no. 62), a = 17.129(2), b = 6.628(1), c = 12.182(1) A; for MIL-53 ht (Al), orthorhombic system, Imma (no. 74), a = 6.608(1), b = 16.675(3), c = 12.813(2) A; for MIL-53 lt (Al), monoclinic system, Cc (no. 9), a = 19.513(2), b = 7.612(1), c = 6.576(1) A, beta = 104.24(1) degrees. PMID:15034882

  12. Metal-organic frameworks as potential shock absorbers: the case of the highly flexible MIL-53(Al).

    PubMed

    Yot, Pascal G; Boudene, Zoubeyr; Macia, Jasmine; Granier, Dominique; Vanduyfhuys, Louis; Verstraelen, Toon; Van Speybroeck, Veronique; Devic, Thomas; Serre, Christian; Férey, Gérard; Stock, Norbert; Maurin, Guillaume

    2014-08-28

    The mechanical energy absorption ability of the highly flexible MIL-53(Al) MOF material was explored using a combination of experiments and molecular simulations. A pressure-induced transition between the large pore and the closed pore forms of this solid was revealed to be irreversible and associated with a relatively large energy absorption capacity. Both features make MIL-53(Al) the first potential MOF candidate for further use as a shock absorber. PMID:25008198

  13. Performance of Coded Offset Quadrature Phase-Shift Keying (OQPSK) and MIL-STD Shaped OQPSK (SOQPSK) with Iterative Decoding

    NASA Astrophysics Data System (ADS)

    Li, L.; Simon, M. K.

    2004-02-01

    We show that, similar to the trellis-coded modulation representation of MIL-STD shaped offset quadrature phase-shift keying (SOQPSK), offset quadrature phase-shift keying (OQPSK) can be decomposed into a "degraded" trellis encoder and a memoryless mapper. Based on the representations of OQPSK and MIL-STD SOQPSK as trellis-coded modulations, we investigate the potential coding gains achievable from the application of simple outer codes to form a concatenated coding structure with iterative decoding. For MIL-STD SOQPSK, we describe the optimum receiver corresponding to its trellis-coded modulation form and then propose a simplified receiver. The bit-error-rate (BER) performances of both receivers for uncoded and coded MIL-STD SOQPSK are simulated and compared to those of OQPSK and Feher-patented quadrature phase-shift keying (FQPSK). The asymptotic BER performance of MIL-STD SOQPSK also is analyzed and compared to that of OQPSK and FQPSK. Simulation results show that, compared to their uncoded systems, both OQPSK and MIL-STD SOQPSK obtain significant coding gains by applying iterative decoding to either the parallel concatenated coding scheme or the serial one, even when very simple outer codes are used.

  14. Structure and properties of Al-MIL-53-ADP, a breathing MOF based on the aliphatic linker molecule adipic acid.

    PubMed

    Reinsch, Helge; Pillai, Renjith S; Siegel, Renée; Senker, Jürgen; Lieb, Alexandra; Maurin, Guillaume; Stock, Norbert

    2016-03-01

    The new aluminium based metal-organic framework [Al(OH)(O2C-C4H8-CO2)]·H2O denoted as Al-MIL-53-ADP-lp (lp stands for large pore) was synthesised under solvothermal conditions. This solid is an analogue of the archetypical aluminium terephthalate Al-MIL-53 based on the aliphatic single-chain linker molecule adipic acid (H2ADP, hexanedioic acid). In contrast to its aromatic counterparts, Al-MIL-53-ADP exhibits a structural breathing behaviour solely upon dehydration/rehydration. The crystal structure of the anhydrous compound denoted as Al-MIL-53-ADP-np (np stands for narrow pore) was determined by a combination of forcefield-based computations and Rietveld refinement of the powder X-ray diffraction data while the structure of the hydrated form Al-MIL-53-ADP-lp was derived computationally by a combination of force field based methods and Density Functional Theory calculations. Both structures were further supported by (1)H, (13)C and (27)Al high-resolution NMR MAS 1D data coupled again with simulations. Al-MIL-53-ADP was further characterised by means of vibrational spectroscopy, elemental analysis, thermogravimetry and water vapour sorption. PMID:26498663

  15. Graphite oxide/metal-organic framework (MIL-101): remarkable performance in the adsorptive denitrogenation of model fuels.

    PubMed

    Ahmed, Imteaz; Khan, Nazmul Abedin; Jhung, Sung Hwa

    2013-12-16

    A highly porous metal-organic framework (MOF), MIL-101 (Cr-benzenedicarboxylate), was synthesized in the presence of graphite oxide (GO) to produce GO/MIL-101 composites. The porosity of the composites increased remarkably in the presence of a small amount of GO (<0.5% of MIL-101); however, further increases in GO reduced the porosity. GO also accelerated the synthesis of the MIL-101. The composites (GO/MIL-101) were used, for the first time, in liquid-phase adsorptions. The adsorptive removal of nitrogen-containing compounds (NCCs) and sulfur-containing compounds (SCCs) from model fuels demonstrated the potential applications of the composites in adsorptions, and the adsorption capacity was dependent on the surface area and pore volume of the composites. Most importantly, the GO/MIL-101 composite has the highest adsorption capacity for NCCs among reported adsorbents so far, partly because of the increased porosity of the composite. Finally, the results suggest that GO could be used in the synthesis of highly porous MOF composites, and the obtained materials could be used in various adsorptions in both liquid and gas/vapor phase (such as H2, CH4, and CO2 storage) adsorptions, because of the high porosity and functional GO. PMID:24299306

  16. Programming MIL-101Cr for selective and enhanced CO2 adsorption at low pressure by postsynthetic amine functionalization.

    PubMed

    Khutia, Anupam; Janiak, Christoph

    2014-01-21

    MIL-101Cr fully or partially (p) postsynthetically modified with nitro (-NO2) or amino (-NH2) groups was shown to be a robust, water stable, selective and enhanced carbon dioxide (CO2) adsorption material with the amine-functionality. The highly microporous amine-modified frameworks (up to 1.6 cm(3) g(-1) total pore volume) exhibit excellent thermal stability (>300 C) with BET surface areas up to 2680 m(2) g(-1). At 1 bar (at 273 K) the gases CO2, CH4 and N2 are adsorbed up to 22.2 wt%, 1.67 wt% and 2.27 wt%, respectively. The two amine-modified MIL-101Cr-NH2 (4) and MIL-101Cr-pNH2 (5) showed the highest gas uptake capacities in the series with high ratios for the CO2 : N2 and CO2 : CH4 selectivities (up to 119 : 1 and 75 : 1, respectively, at 273 K). Comparison with non-modified MIL-101Cr traces the favorable CO2 adsorption properties of MIL-101Cr-NH2 (4) and MIL-101Cr-pNH2 (5) to the presence of the Lewis-basic amine groups. MIL-101Cr-NH2 (4) has a high isosteric heat of adsorption of 43 kJ mol(-1) at zero surface coverage and also >23 kJ mol(-1) over the entire adsorption range, which is well above the heat of liquefaction of bulk CO2. Large CO2 uptake capacities of amine-functionalized 4 and 5, coupled with high adsorption enthalpy, high selectivities and proven long-term water stability, make them suitable candidates for capturing CO2 at low pressure from gas mixtures including the use as a CO2 sorbent from moist air. PMID:24196659

  17. Ar-Ar Dating of Martian Chassignites, NWA2737 and Chassigny, and Nakhlite MIL03346

    NASA Technical Reports Server (NTRS)

    Bogard, D. D.; Garrison, D. H.

    2006-01-01

    Until recently only three nakhlites and one chassignite had been identified among martian meteorites. These four exhibit very similar radiometric ages and cosmic ray exposure (CRE) ages, indicating that they may have derived from a common location on Mars and were ejected into space by a single impact. This situation is quite different from that of martian shergottites, which exhibit a range of radiometric ages and CRE ages (1). Recently, several new nakhlites and a new martian dunite (NWA2737) have been recognized. Here we report our results of Ar-39-Ar-40 dating for the MIL03346 nakhlite and the NWA2737 "chassignite", along with new results on Chassigny.

  18. A dual technology radiation hardened circuit family for MIL-STD-1750A computer applications

    NASA Astrophysics Data System (ADS)

    Chapman, Terry; Green, David

    The development of a radiation hardened emulating circuit (RHEC) chip set for future missile and satellite operations is discussed. The RHEC chip set is designed to implement MIL-STD computer architecture requirements. The architectural designing begins with the development of functional and computational algorithms needed to implement the target instrumentation sets; the architecture is then broken into functional elements and the algorithms and timing for those devices are assigned. The components included in the enhanced chip set and a resulting typical CPU block diagram are presented. The design and capabilities for a large scale integration simulation for supporting the design/development cycle of hardware systems are described.

  19. Potential Damage to Flight Hardware from MIL-STD-462 CS02 Setup

    NASA Technical Reports Server (NTRS)

    Harris, Patrick K.; Block, Nathan F.

    2002-01-01

    The MIL-STD-462 CS02 conducted susceptibility test setup, performed during electromagnetic compatibility (EMC) testing, consists of an audio transformer with the secondary used as an inductor and a large capacitor. Together, these two components form an L-type low-pass filter to minimize the injected test signal input into the power source. Some flight hardware power input configurations are not compatible with this setup and break into oscillation when powered up. This can damage flight hardware and caused a catastrophic failure to an item tested in the Goddard Space Flight Center (GSFC) Large EMC Test Facility.

  20. Another Look at the Draft Mil-Std-1540E Unit Random Vibration Test Requirements

    NASA Astrophysics Data System (ADS)

    Perl, E.; Peterson, A. J..; Davis, D.

    2012-07-01

    The draft Mil-Std-1540E has been updated to reflect lessons learned since its publication as an SMC Standard in 2008, [1], and an earlier Aerospace Corporation Technical Report released in 2006, [2]. This paper discusses the technical rationale supporting some of the unit random vibration test requirements to provide better insight into their derivation and application to programs. It is intended that these requirements be tailored for each program to reflect the customer risk profile. Several tailoring options are provided and a two phase test strategy is discussed to highlight its applicability to utilizing heritage hardware in new applications.

  1. Ar-39-Ar-40 Ages of Two Nakhlites, MIL03346 and Y000593: A Detailed Analysis

    NASA Technical Reports Server (NTRS)

    Park, Jisun; Garrison, Daniel; Bogard, Donald

    2007-01-01

    Radiometric dating of martian nakhlites by several techniques have given similar ages of approx.1.2-1.4 Ga [e.g. 1, 2]. Unlike the case with shergottites, where the presence of martian atmosphere and inherited radiogenic Ar-40 produce apparent Ar-39-Ar-40 ages older than other radiometric ages, Ar-Ar ages of nakhlites are similar to ages derived by other techniques. However, even in some nakhlites the presence of trapped martian Ar produces some uncertainty in the Ar-Ar age. We present here an analysis of such Ar-Ar ages from the MIL03346 and Y000593 nakhlites.

  2. Potential Damage to Flight Hardware from MIL-STD-462 CS02 Setup

    NASA Technical Reports Server (NTRS)

    Harris, Patrick K.; Block, Nathan F.

    2003-01-01

    The MIL-STD-462 CS02 conducted susceptibility test setup includes an audio transformer, with the secondary used as an inductor, and a large capacitor. Together, these two components form an L-type low-pass filter to minimize the injected test signal input into the power source. Some flight hardware power input configurations are not compatible with this setup and break into oscillation when powered up. This, in turn, can damage flight hardware. Such an oscillation resulted in the catastrophic failure of an item tested in the Goddard Space Flight Center (GSFC) Large electromagnetic compatibility (EMC) Test Facility.

  3. MIL-STD-1553 Dual Redundant Remote Terminal Unit, BUS Controller and BUS Monitor Superhybrid

    NASA Astrophysics Data System (ADS)

    Friedman, Steven N.

    This paper describes the performance, physical, and electrical characteristics of the BUS-65600 Superhybrid. The Superhybrid is a programmable, fully compliant MIL-STD-1553 Dual Redundant Remote Terminal Unit (RTU), BUS Controller (BC) and BUS Monitor (BM). The BUS-65600 requires an external transceiver, clock, and transformers to provide a fully functional terminal interface. A discussion of the next generation CMOS Silicon-On-Sapphire (SOS) single monolithic chip RTU/BC/BM is included. The special features and capabilities, along with special package technologies are highlighted. The Superhybrid has a Direct Memory Access computer interface plus special control lines which are fully described.

  4. A simulation approach to MIL-STD-1553 Multiplex Bus interfacing

    NASA Astrophysics Data System (ADS)

    Lawson, R. J.; Murray, J.

    The technique developed for interfacing a 32 bit minicomputer to the MIL-STD-1553 Avionics Multiplex Bus (Mux Bus) in the F/A-18 Part Task Trainer is discussed. It is noted that the capability of access to the Mux Bus through a minicomputer provides the means of emulating any aircraft system the mission computer interfaces to in the aircraft. The capability of emulating the mission computer also exists for simulating real aircraft systems. The technique for recognizing bus requests for systems data required for simulation and responding to these requests within the timing constraints of 1553 is described, and details of bus operation specified by 1553 are given.

  5. Thermal history of nakhlites: A comparison between MIL 03346 and its terrestrial analogue Theo’s flow

    NASA Astrophysics Data System (ADS)

    Domeneghetti, M. C.; Fioretti, A. M.; Cámara, F.; McCammon, C.; Alvaro, M.

    2013-11-01

    High resolution single-crystal X-ray diffraction (HR-SCXRD) and Mössbauer spectroscopy of the intracrystalline cation distribution have been performed on augitic core-crystals from a Miller Range nakhlite (sample MIL 03346,13) with approximate composition of En36Fs24Wo40. The Mössbauer data on the single-crystal yielded a very low Fe3+ content [Fe3+/Fetotal - 0.033(23) a.p.f.u.] that, together with the Electron microprobe analysis (EMPA) and the X-ray structural data allowed us to obtain the accurate cation site distribution and the Fe2+-Mg degree of order. This leads to a closure temperature (Tc) of 500 with a standard deviation of ±100 °C that would correspond to a slow cooling rate, which is in disagreement with petrologic evidence that indicates that this sample originates from a fast cooled (∼3-6 °C/h) lava flow. In order to clarify this discrepancy we undertook (i) a SC-XRD study of an augite (∼En49Fs9 Wo42) from a pyroxenite (TS7) of Theo's flow, a 120-m-thick lava flow regarded as a terrestrial analogue of MIL 03346; (ii) an annealing experiment at 600 °C on a crystal from exactly the same fragment of MIL 03346. SC-XRD data from TS7 augite yields a Tc = 600(20) °C, consistent with the cooling rate expected at 85 m below the surface. This Tc is higher, although similar within error, to the Tc = 500(100) °C obtained for MIL 03346; thus suggesting relatively slower cooling for MIL 03346 with respect to TS7. The annealing experiment on the MIL 03346 crystal clearly showed that the degree of order remained unchanged, further confirming that the actual Tc is close to 600 °C. This result appears inconsistent with the shallow depth of origin (∼<2 m) assumed for MIL 03346, further supporting the discrepancy between MIL 03346 textural and petrologic evidence of fast cooling and the abovementioned Tc results obtained for augite. Therefore, a tentative scenario is that, soon after eruption and initial quench and while still at relatively high-T (∼600 °C), MIL 03346 was blanketed with subsequent lava flows that slowed down the cooling rate and allowed the augite Fe2+-Mg exchange reaction to proceed.

  6. Petrology and chemistry of MIL 03346 and its significance in understanding the petrogenesis of nakhlites on Mars

    NASA Astrophysics Data System (ADS)

    Day, James M. D.; Taylor, Lawrence A.; Floss, Christine; McSween, Harry Y.

    2006-04-01

    Antarctic meteorite Miller Range (MIL) 03346 is a nakhlite composed of 79% clinopyroxene, ˜1% olivine, and 20% vitrophyric intercumulus material. We have performed a petrological and geochemical study of MIL 03346, demonstrating a petrogenetic history similar to previously discovered nakhlites. Quantitative textural study of MIL 03346 indicates long (>1 × 101 yr) residence times for the cumulus augite, whereas the skeletal Fe-Ti oxide, fayalite, and sulfide in the vitrophyric intercumulus matrix suggest rapid cooling, probably as a lava flow. From the relatively high forsterite contents of olivine (up to Fo43) compared with other nakhlites and compositions of augite cores (Wo38-42En35-40Fs22-28) and their hedenbergite rims, we suggest that MIL 03346 is part of the same or a similar Martian cumulate-rich lava flow as other nakhlites. However, MIL 03346 has experienced less equilibration and faster cooling than other nakhlites discovered to date. Calculated trace element concentrations based upon modal abundances of MIL 03346 and its constituent minerals are identical to whole rock trace element abundances. Parental melts for augite have REE patterns that are approximately parallel with whole rock and intercumulus melt using experimentally defined partition coefficients. This parallelism reflects closed-system crystallization for MIL 03346, where the only significant petrogenetic process between formation of augite and eruption and emplacement of the nakhlite flow has been fractional crystallization. A model for the petrogenesis of MIL 03346 and the nakhlites (Nakhla, Governador Valadares, Lafayette, Yamato-000593, Northwest Africa (NWA) 817, NWA 998) would include: 1) partial melting and ascent of melt generated from a long-term LREE depleted mantle source, 2) crystallization of cumulus augite (±olivine, ±magnetite) in a shallow-level Martian magma chamber, 3) eruption of the crystal-laden nakhlite magma onto the surface of Mars, 4) cooling, crystal settling, overgrowth, and partial equilibration to different extents within the flow, 5) secondary alteration through hydrothermal processes, possibly immediately succeeding or during emplacement of the flow. This model might apply to single - or multiple - flow models for the nakhlites. Ultimately, MIL 03346 and the other nakhlites preserve a record of magmatic processes in volcanic rocks on Mars with analogous petrogenetic histories to pyroxene-rich terrestrial lava flows and to komatiites.

  7. Post-synthetic modification of MIL-101(Cr) with pyridine for high-performance liquid chromatographic separation of tocopherols.

    PubMed

    Yang, Fang; Yang, Cheng-Xiong; Yan, Xiu-Ping

    2015-05-01

    Effective separation of tocopherols is challenging and significant due to their structural similarity and important biological role. Here we report the post-synthetic modification of metal-organic framework (MOF) MIL-101(Cr) with pyridine for high-performance liquid chromatographic (HPLC) separation of tocopherols. Baseline separation of four tocopherols was achieved on a pyridine-grafted MIL-101(Cr) packed column within 10 min using hexane/isopropanol (96:4, v/v) as the mobile phase at a flow rate of 0.5 mL min(-1). The pyridine-grafted MIL-101(Cr) packed column gave high column efficiency (85,000 plates m(-1) for δ-tocopherol) and good precision (0.2-0.3% for retention time, 1.8-3.4% for peak area, 2.6-2.7% for peak height), and also offered much better performance than unmodified MIL-101(Cr) and commercial amino-bonded silica packed column for HPLC separation of tocopherols. The results not only show the promising application of pyridine-grafted MIL-101(Cr) as a novel stationary phase for HPLC separation of tocopherols, but also reveal a facile post-modification of MOFs to expand the application of MOFs in separation sciences. PMID:25770616

  8. The MIL-88A-Derived Fe3O4-Carbon Hierarchical Nanocomposites for Electrochemical Sensing

    NASA Astrophysics Data System (ADS)

    Wang, Li; Zhang, Yayun; Li, Xia; Xie, Yingzhen; He, Juan; Yu, Jie; Song, Yonghai

    2015-09-01

    Metal or metal oxides/carbon nanocomposites with hierarchical superstructures have become one of the most promising functional materials in sensor, catalysis, energy conversion, etc. In this work, novel hierarchical Fe3O4/carbon superstructures have been fabricated based on metal-organic frameworks (MOFs)-derived method. Three kinds of Fe-MOFs (MIL-88A) with different morphologies were prepared beforehand as templates, and then pyrolyzed to fabricate the corresponding novel hierarchical Fe3O4/carbon superstructures. The systematic studies on the thermal decomposition process of the three kinds of MIL-88A and the effect of template morphology on the products were carried out in detail. Scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction, X-ray photoelectron spectroscopy and thermal analysis were employed to investigate the hierarchical Fe3O4/carbon superstructures. Based on these resulted hierarchical Fe3O4/carbon superstructures, a novel and sensitive nonenzymatic N-acetyl cysteine sensor was developed. The porous and hierarchical superstructures and large surface area of the as-formed Fe3O4/carbon superstructures eventually contributed to the good electrocatalytic activity of the prepared sensor towards the oxidation of N-acetyl cysteine. The proposed preparation method of the hierarchical Fe3O4/carbon superstructures is simple, efficient, cheap and easy to mass production. It might open up a new way for hierarchical superstructures preparation.

  9. Adsorption of Carbon Dioxide by MIL-101(Cr): Regeneration Conditions and Influence of Flue Gas Contaminants

    PubMed Central

    Liu, Qing; Ning, Liqi; Zheng, Shudong; Tao, Mengna; Shi, Yao; He, Yi

    2013-01-01

    MIL-101(Cr) has drawn much attention due to its high stability compared with other metal-organic frameworks. In this study, three trace flue gas contaminants (H2O, NO, SO2) were each added to a 10 vol% CO2/N2 feed flow and found to have a minimal impact on the adsorption capacity of CO2. In dynamic CO2 regeneration experiments, complete regeneration occurred in 10 min at 328 K for temperature swing adsorption-N2-stripping under a 50 cm3/min N2 flow and at 348 K for vacuum-temperature swing adsorption at 20 KPa. Almost 99% of the pre-regeneration adsorption capacity was preserved after 5 cycles of adsorption/desorption under a gas flow of 10 vol% CO2, 100 ppm SO2, 100 ppm NO, and 10% RH, respectively. Strong resistance to flue gas contaminants, mild recovery conditions, and excellent recycling efficiency make MIL-101(Cr) an attractive adsorbent support for CO2 capture. PMID:24107974

  10. MIL-100 derived nitrogen-embodied carbon shells embedded with iron nanoparticles

    NASA Astrophysics Data System (ADS)

    Mao, Chengyu; Kong, Aiguo; Wang, Yuan; Bu, Xianhui; Feng, Pingyun

    2015-06-01

    The use of metal-organic frameworks (MOFs) as templates and precursors to synthesize new carbon materials with controllable morphology and pre-selected heteroatom doping holds promise for applications as efficient non-precious metal catalysts. Here, we report a facile pyrolysis pathway to convert MIL-100 into nitrogen-doped carbon shells encapsulating Fe nanoparticles in a comparative study involving multiple selected nitrogen sources. The hierarchical porous architecture, embedded Fe nanoparticles, and nitrogen decoration endow this composite with a superior oxygen reduction activity. Furthermore, the excellent durability and high methanol tolerance even outperform the commercial Pt-C catalyst.The use of metal-organic frameworks (MOFs) as templates and precursors to synthesize new carbon materials with controllable morphology and pre-selected heteroatom doping holds promise for applications as efficient non-precious metal catalysts. Here, we report a facile pyrolysis pathway to convert MIL-100 into nitrogen-doped carbon shells encapsulating Fe nanoparticles in a comparative study involving multiple selected nitrogen sources. The hierarchical porous architecture, embedded Fe nanoparticles, and nitrogen decoration endow this composite with a superior oxygen reduction activity. Furthermore, the excellent durability and high methanol tolerance even outperform the commercial Pt-C catalyst. Electronic supplementary information (ESI) available: Material synthesis and elemental analysis, electrochemistry measurements, and additional figures. See DOI: 10.1039/c5nr02346g

  11. The MIL-88A-Derived Fe3O4-Carbon Hierarchical Nanocomposites for Electrochemical Sensing.

    PubMed

    Wang, Li; Zhang, Yayun; Li, Xia; Xie, Yingzhen; He, Juan; Yu, Jie; Song, Yonghai

    2015-01-01

    Metal or metal oxides/carbon nanocomposites with hierarchical superstructures have become one of the most promising functional materials in sensor, catalysis, energy conversion, etc. In this work, novel hierarchical Fe3O4/carbon superstructures have been fabricated based on metal-organic frameworks (MOFs)-derived method. Three kinds of Fe-MOFs (MIL-88A) with different morphologies were prepared beforehand as templates, and then pyrolyzed to fabricate the corresponding novel hierarchical Fe3O4/carbon superstructures. The systematic studies on the thermal decomposition process of the three kinds of MIL-88A and the effect of template morphology on the products were carried out in detail. Scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction, X-ray photoelectron spectroscopy and thermal analysis were employed to investigate the hierarchical Fe3O4/carbon superstructures. Based on these resulted hierarchical Fe3O4/carbon superstructures, a novel and sensitive nonenzymatic N-acetyl cysteine sensor was developed. The porous and hierarchical superstructures and large surface area of the as-formed Fe3O4/carbon superstructures eventually contributed to the good electrocatalytic activity of the prepared sensor towards the oxidation of N-acetyl cysteine. The proposed preparation method of the hierarchical Fe3O4/carbon superstructures is simple, efficient, cheap and easy to mass production. It might open up a new way for hierarchical superstructures preparation. PMID:26387535

  12. Ninety Per Mil Enrichment of Neon In Firn Air At South Pole

    NASA Astrophysics Data System (ADS)

    Severinghaus, J.; Battle, M.

    Firn air was sampled in 2001 from the South Pole with the objective of reconstructing the composition of the atmosphere over the past century. As reported previously, a layer near the bottom of the Firn from 114 m to 122 m appears not to mix with the atmosphere and is called the "lock-in zone" or the "non-diffusive zone". Our noble gas measurements of Firn air show that the neon-22 to argon-36 ratio is progressively enriched with depth in the lock-in zone, reaching maximum values in the deepest sample of +90.7 per mil (uncertainty of 0.3 per mil) with respect to atmosphere. This value includes a correction for gravitational enrichment using the argon 40/argon-36 ratio. Molecular oxygen is also progressively enriched in the lock-in zone, with neon changing 33 times more than oxygen (corrected for atmospheric change due to fossil fuel burning). We propose that the neon enrichment is due either to 1) size-dependent fractionation of air expelled from the closing bubbles, or 2) diffusion of neon through the ice in response to the overpressure in the newly formed bubbles, in either case with accumulation of excess neon in the remaining open Firn layers.

  13. The MIL-88A-Derived Fe3O4-Carbon Hierarchical Nanocomposites for Electrochemical Sensing

    PubMed Central

    Wang, Li; Zhang, Yayun; Li, Xia; Xie, Yingzhen; He, Juan; Yu, Jie; Song, Yonghai

    2015-01-01

    Metal or metal oxides/carbon nanocomposites with hierarchical superstructures have become one of the most promising functional materials in sensor, catalysis, energy conversion, etc. In this work, novel hierarchical Fe3O4/carbon superstructures have been fabricated based on metal-organic frameworks (MOFs)-derived method. Three kinds of Fe-MOFs (MIL-88A) with different morphologies were prepared beforehand as templates, and then pyrolyzed to fabricate the corresponding novel hierarchical Fe3O4/carbon superstructures. The systematic studies on the thermal decomposition process of the three kinds of MIL-88A and the effect of template morphology on the products were carried out in detail. Scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction, X-ray photoelectron spectroscopy and thermal analysis were employed to investigate the hierarchical Fe3O4/carbon superstructures. Based on these resulted hierarchical Fe3O4/carbon superstructures, a novel and sensitive nonenzymatic N-acetyl cysteine sensor was developed. The porous and hierarchical superstructures and large surface area of the as-formed Fe3O4/carbon superstructures eventually contributed to the good electrocatalytic activity of the prepared sensor towards the oxidation of N-acetyl cysteine. The proposed preparation method of the hierarchical Fe3O4/carbon superstructures is simple, efficient, cheap and easy to mass production. It might open up a new way for hierarchical superstructures preparation. PMID:26387535

  14. Mission-oriented requirements for updating MIL-H-8501: Calspan proposed structure and rationale

    NASA Technical Reports Server (NTRS)

    Chalk, C. R.; Radford, R. C.

    1985-01-01

    This report documents the effort by Arvin/Calspan Corporation to formulate a revision of MIL-H-8501A in terms of Mission-Oriented Flying Qualities Requirements for Military Rotorcraft. Emphasis is placed on development of a specification structure which will permit addressing Operational Missions and Flight Phases, Flight Regions, Classification of Required Operational Capability, Categorization of Flight Phases, and Levels of Flying Qualities. A number of definitions is established to permit addressing the rotorcraft state, flight envelopes, environments, and the conditions under which degraded flying qualities are permitted. Tentative requirements are drafted for Required Operational Capability Class 1. Also included is a Background Information and Users Guide for the draft specification structure proposed for the MIL-H-8501A revision. The report also contains a discussion of critical data gaps and attempts to prioritize these data gaps and to suggest experiments that should be performed to generate data needed to support formulation of quantitative design criteria for the additional Operational Capability Classes 2, 3, and 4.

  15. Ab Initio Parametrized Force Field for the Flexible Metal-Organic Framework MIL-53(Al).

    PubMed

    Vanduyfhuys, L; Verstraelen, T; Vandichel, M; Waroquier, M; Van Speybroeck, V

    2012-09-11

    A force field is proposed for the flexible metal-organic framework MIL-53(Al), which is calibrated using density functional theory calculations on nonperiodic clusters. The force field has three main contributions: an electrostatic term based on atomic charges derived with a modified Hirshfeld-I method, a van der Waals (vdW) term with parameters taken from the MM3 model, and a valence force field whose parameters were estimated with a new methodology that uses the gradients and Hessian matrix elements retrieved from nonperiodic cluster calculations. The new force field predicts geometries and cell parameters that compare well with the experimental values both for the large and narrow pore phases. The energy profile along the breathing mode of the empty material reveals the existence of two minima, which confirms the intrinsic bistable behavior of the MIL-53. Even without the stimulus of external guest molecules, the material may transform from the large pore (lp) to the narrow pore (np) phase [Liu et al. J. Am. Chem. Soc.2008, 120, 11813]. The relative stability of the two phases critically depends on the vdW parameters, and the MM3 dispersion interaction has the tendency to overstabilize the np phase. PMID:26605731

  16. Characterization of adsorbed water in MIL-53(Al) by FTIR spectroscopy and ab-initio calculations

    NASA Astrophysics Data System (ADS)

    Salazar, J. M.; Weber, G.; Simon, J. M.; Bezverkhyy, I.; Bellat, J. P.

    2015-03-01

    Here, we report ab-initio calculations developed with a twofold purpose: understand how adsorbed water molecules alter the infrared spectrum of the metal-organic framework MIL-53(Al) and to investigate which are the associated physico-chemical processes. The analyzed structures are the two anhydrous narrow (np⊘) and large (lp⊘) pore forms and the hydrated narrow pore form (np-H2O) of the MIL-53(Al). For these structures, we determined their corresponding infrared spectra (FTIR) and we identified the vibrational modes associated to the dominant spectral lines. We show that wagging and scissoring modes of CO2 give flexibility to the structure for facilitating the lp⊘- np⊘ transition. In our studies, this transition is identified by eight vibrational modes including the δCH(18a) vibrational mode currently used to identify the mentioned transition. We report an exhaustive band identification of the infrared spectra associated to the analyzed structures. Moreover, the FTIR for the np-H2O structure allowed us to identify four types of water molecules linked to the host structure by one to three hydrogen bonds.

  17. Characterization of adsorbed water in MIL-53(Al) by FTIR spectroscopy and ab-initio calculations.

    PubMed

    Salazar, J M; Weber, G; Simon, J M; Bezverkhyy, I; Bellat, J P

    2015-03-28

    Here, we report ab-initio calculations developed with a twofold purpose: understand how adsorbed water molecules alter the infrared spectrum of the metal-organic framework MIL-53(Al) and to investigate which are the associated physico-chemical processes. The analyzed structures are the two anhydrous narrow (np⊘) and large (lp⊘) pore forms and the hydrated narrow pore form (np-H2O) of the MIL-53(Al). For these structures, we determined their corresponding infrared spectra (FTIR) and we identified the vibrational modes associated to the dominant spectral lines. We show that wagging and scissoring modes of CO2 give flexibility to the structure for facilitating the lp⊘- np⊘ transition. In our studies, this transition is identified by eight vibrational modes including the δCH(18a) vibrational mode currently used to identify the mentioned transition. We report an exhaustive band identification of the infrared spectra associated to the analyzed structures. Moreover, the FTIR for the np-H2O structure allowed us to identify four types of water molecules linked to the host structure by one to three hydrogen bonds. PMID:25833598

  18. Possible impacts of VHSIC on MIL-STD-1553B data transmission management

    NASA Astrophysics Data System (ADS)

    Berardi, L.; Merlano, M.

    1985-08-01

    High performance integrated circuit technologies allow for dramatic improvement in speed and reduction in size of the integrated circuits. This fact results in the possibility to pack in a denser way the computing and decision making functions of the avionics systems. Nevertheless it is still necessary to connect together the various sytem components, spread through the airframe, by means of an interfunction data transmission system. For these reasons the application of the new technologies to a MIL-STD-1553B data transmission system is considered. In particular the data management task allocated to the Bus Controller is described in four increasing levels of complexity, ranging from the minimum requirement to an "expert" function including an high degree of configurability. The performance obtainable by implementing the functions in the current or new technologies, and with two different architectural solutions, are measured or estimated. The comparison among the obtained results shows that the new technologies not only improve the performances of the data transmission system, but also allow to include an higher degree of intelligence in the function, extending in this way the application of MIL-STD-1553B to future advanced avionic systems.

  19. Rb-Sr and Sm-Nd Isotopic Studies of Antarctic Nakhlite MIL 03346

    NASA Technical Reports Server (NTRS)

    Shih, C.-Y.; Nyquist, L. E.; Reese, Y.

    2006-01-01

    Nakhlites are olivine-bearing clinopyroxenites with cumulate textures, and probably came from Mars [e.g., 1]. A total of seven nakhlites have been identified so far. Unlike other martian meteorites (e.g., shergottites), nakhlites have been only moderately shocked and their original igneous textures are still well-preserved. Also, these meteorites have similarly older crystallization ages of approx.1.3 Ga compared to shergottites with ages of approx.0.18-0.57 Ga [e.g., 2]. MIL 03346 is characterized by abundant (approx.20 vol %) glassy mesostasis, indicating that it cooled rapidly and probably formed near the top [3] or at the bottom [4] of the chilled margin of a thick intrusive body. The mesostasis quenched from the trapped intercumulus liquid may provide information on the parent magma compositions of the nakhlites. In this report, we present Rb-Sr and Sm-Nd isotopic data for MIL 03346, discuss correlation of its age with those of other nakhlites and the nature of their source regions in the Martian mantle.

  20. Quasi-1D physics in metal-organic frameworks: MIL-47(V) from first principles

    PubMed Central

    Jaeken, Jan W; De Baerdemacker, Stijn; Lejaeghere, Kurt; Van Speybroeck, Veronique

    2014-01-01

    Summary The geometric and electronic structure of the MIL-47(V) metal-organic framework (MOF) is investigated by using ab initio density functional theory (DFT) calculations. Special focus is placed on the relation between the spin configuration and the properties of the MOF. The ground state is found to be antiferromagnetic, with an equilibrium volume of 1554.70 Å3. The transition pressure of the pressure-induced large-pore-to-narrow-pore phase transition is calculated to be 82 MPa and 124 MPa for systems with ferromagnetic and antiferromagnetic chains, respectively. For a mixed system, the transition pressure is found to be a weighted average of the ferromagnetic and antiferromagnetic transition pressures. Mapping DFT energies onto a simple-spin Hamiltonian shows both the intra- and inter-chain coupling to be antiferromagnetic, with the latter coupling constant being two orders of magnitude smaller than the former, suggesting the MIL-47(V) to present quasi-1D behavior. The electronic structure of the different spin configurations is investigated and it shows that the band gap position varies strongly with the spin configuration. The valence and conduction bands show a clear V d-character. In addition, these bands are flat in directions orthogonal to VO6 chains, while showing dispersion along the the direction of the VO6 chains, similar as for other quasi-1D materials. PMID:25383285

  1. Novel visible-light-responsive Ag/AgCl@MIL-101 hybrid materials with synergistic photocatalytic activity.

    PubMed

    Gao, Shutao; Feng, Tao; Feng, Cheng; Shang, Ningzhao; Wang, Chun

    2016-03-15

    In this paper, a novel visible-light responsive photocatalyst of Ag/AgCl@MIL-101 was synthesized via vapor diffusion-photoreduction strategy. The as-prepared composite material was characterized using X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, ultraviolet-visible diffuse reflection spectra and X-ray photoelectron spectroscopy. Due to the synergistic effect between Ag/AgCl and MIL-101, the composite photocatalyst exhibited an enhanced and stable photoactivity for the degradation of Rhodamine B under visible light irradiation. The relationship between the photocatalytic activity and the structure of Ag/AgCl@MIL-101 hybrid material was discussed and the possible reaction mechanism was proposed. PMID:26745745

  2. A pulse chromatographic study of the adsorption properties of the amino-MIL-53 (Al) metal-organic framework.

    PubMed

    Couck, Sarah; Rémy, Tom; Baron, Gino V; Gascon, Jorge; Kapteijn, Freek; Denayer, Joeri F M

    2010-08-28

    Low-coverage adsorption properties of the metal-organic framework amino-MIL-53 (Al) were determined using the pulse chromatographic technique. By using n-alkanes, iso-alkanes, 1-alkenes, cyclohexane and benzene as probe molecules, the nature of the adsorptive interactions in amino-MIL-53 (Al) was studied. Henry adsorption constants and adsorption enthalpies of iso-alkanes are significantly lower than those of the linear alkanes, demonstrating the shape selective properties of amino-MIL-53. The presence of amino-groups in the pores of the material increases the electrostatic contributions with molecules containing double bonds. A simple model relates adsorption enthalpies to the number of hydrogen atoms and double bonds in the molecule. The effective pore size of the material was estimated based on the relationship between adsorption enthalpy and entropy. PMID:20532387

  3. Aqueous corrosion of olivine in the Mars meteorite Miller Range (MIL) 03346 during Antarctic weathering: Implications for water on Mars

    NASA Astrophysics Data System (ADS)

    Velbel, Michael A.

    2016-05-01

    Several nakhlites (clinopyroxenite meteorites from Mars) contain olivine phenocrysts with corrosion features identical in size, shape and distribution to the smaller etch-pits of well-characterized weathered terrestrial olivine. Miller Range (MIL) 03346 is an Antarctic nakhlite find, recovered after long exposure to Antarctic conditions. The distribution of discrete olivine etch-pits almost exclusively within a few hundred microns of allocation MIL 03346,171's documentably exposed surface suggests that they formed by terrestrial weathering in Antarctica. The small size of olivine etch-pits in MIL 03346,171 relative to commonly much larger etch-pits in even incipiently weathered terrestrial examples suggests that the duration of its exposure to weathering conditions was short, or the weathering conditions to which it was exposed did not favor olivine corrosion (in the form of etch-pit formation), or both. Time-scales for the formation of etch-pits, estimated from experimentally determined dissolution rates of olivine over a range of pHs, are comparable to the measured terrestrial age of the meteorite and short relative to the time available for possible similar corrosion on Mars. Etch-pits of the observed size on MIL 03346 olivine phenocrysts would be relatively easy to form supraglacially under brief episodic acidic Antarctic conditions, but the terrestrial age of MIL 03346 is long enough that its olivine might have been weathered to the observed state by englacial films of alkaline Antarctic water. The paucity of similar etch-pits in olivine from the interior of MIL 03346 suggests that olivine in this Mars meteorite was exposed to even less aqueous alteration after iddingsitization during its 1.3 billion years on Mars than its exterior was subjected to during its Pleistocene-Holocene exposure to Antarctic weathering conditions.

  4. Pd nanoparticles supported on MIL-101/reduced graphene oxide photocatalyst: an efficient and recyclable photocatalyst for triphenylmethane dye degradation.

    PubMed

    Wu, Yan; Luo, Hanjin; Zhang, Li

    2015-11-01

    To improve the photocatalytic efficiency of chromium-based metal-organic framework (MIL-101) photocatalyst, Pd nanoparticles and reduced graphene oxide were used to modify the MIL-101 via a facile method. The resulting novel photocatalyst was characterized by UV-vis diffuse reflectance spectra (DRS), powder X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). It was indicated that the photocatalyst afforded high photocatalytic efficiency for degradation of two triphenylmethane dyes, brilliant green and acid fuchsin, under exposure to visible light irradiation. Cyclic experiments demonstrated that the photocatalyst showed good reusability and stability for the dye degradation. PMID:26392090

  5. Mineralogy and Petrography of MIL 090001, a Highly Altered CV Chondrite from the Reduced Sub-Group

    NASA Technical Reports Server (NTRS)

    Keller, Lindsay P.

    2011-01-01

    MIL 090001 is a large (greater than 6 kg) CV chondrite from the reduced subgroup (CV(sub red)) that was recovered during the 2009-2010 ANSMET field season [1]. The CV(sub red) subgroup meteorites retain primitive characteristics and have escaped the Na and Fe meta-somatism that affected the oxidized (CV(sub ox)) subgroups. MIL 090001 is, however, reported to be altered [1], and thus a major objective of this study is to characterize its mineralogy and petrography and the extent of the alteration.

  6. XRD and IR structural investigations of a particular breathing effect in the MOF-type gallium terephthalate MIL-53(Ga).

    PubMed

    Volkringer, Christophe; Loiseau, Thierry; Guillou, Nathalie; Férey, Gérard; Elkaïm, Erik; Vimont, Alexandre

    2009-03-28

    The gallium terephthalate Ga(OH)[O(2)C-C(6)H(4)-CO(2)].xA (A = HO(2)C-C(6)H(4)-CO(2)H) was hydrothermally synthesized in water under mild conditions (210 degrees C, 3(1/2) h) in the presence of terephthalic acid. The compound was characterized by powder X-ray diffraction, TGA, IR and BET method. This compound is isostructural to the MIL-53 type, previously observed with the trivalent cations Cr, Fe, Al, In. It exhibits a three-dimensional metal-organic framework built up from infinite chains of trans corner-sharing GaO(4)(OH)(2) octahedra (viamu(2)-hydroxo bonds) linked to each other through the terephthalate linkers. It results in the formation of lozenge-shape channels structure running parallel to the infinite files of gallium-centered octahedra. After activation, the compound is able to adsorb one molar equivalent of water at room temperature under ambient air (MIL-53(Ga){H(2)O}). Different hydrogen bond interactions are observed for the encapsulated water within the channels. In one tunnel, pairs of water species with strong hydrogen-bond interactions were observed whereas in the adjacent tunnel, only a continuous linear and weakly hydrogen bonded network occurs. The dehydrated form is obtained upon heating the MIL-53(Ga) solid at 80 degrees C together with the shrinkage of the channels (MIL-53(Ga)_lt. This form is stable up to 220 degrees C and then the open structure MIL-53(Ga)_ht is visible, but starts to decompose from 350 degrees C. Such a breathing effect was previously reported with cations such as Cr or Al but in the case of Ga, the stability domain of the narrow pore structure MIL-53(Ga)_lt is larger (160 degrees C instead of 20-30 degrees C for Al, for instance). The BET surface area was 1140 +/- 114 m(2).g(-1). The phase transitions were characterized by IR spectroscopy at different temperatures, which confirms the stability domain of the narrow close form (specific band at 1016 cm(-1)) of MIL-53(Ga) and then the pore opening (shifted band toward 1024 cm(-1)) together with the structure collapse. An identical behaviour is also discussed for the aluminum MIL-53 analogue. A comparison between the behaviour of the Al, Ga and Fe samples is presented. PMID:19274304

  7. MIL-M-38510/470 test vectors: Fault detection efficiency measurement via hardware fault simulation. [rca 1802 microprocessor

    NASA Technical Reports Server (NTRS)

    Timoc, C. C.

    1980-01-01

    The stuck fault detection efficiency of the test vectors developed for the MIL-M-38510/470 NASA was measured using a hardware stuck fault simulator for the 1802 microprocessor. Thirty-nine stuck faults were not detected out of a total of 874 injected into the combinatorial and sequential parts of the microprocessor. Since undetected faults can create catastrophic errors in equipment designed for high reliability applications, it is recommended that the MIL-M-38510/470 NASA be enhanced with additional test vectors so as to achieve 100% stuck fault detection efficiency.

  8. The mechanical and inflammatory low back pain (MIL) index: development and validation

    PubMed Central

    2014-01-01

    Background The purpose of this study was the development of a valid and reliable “Mechanical and Inflammatory Low Back Pain Index” (MIL) for assessment of non-specific low back pain (NSLBP). This 7-item tool assists practitioners in determining whether symptoms are predominantly mechanical or inflammatory. Methods Participants (n = 170, 96 females, age = 38 ± 14 years-old) with NSLP were referred to two Spanish physiotherapy clinics and completed the MIL and the following measures: the Roland Morris Questionnaire (RMQ), SF-12 and “Backache Index” (BAI) physical assessment test. For test-retest reliability, 37 consecutive patients were assessed at baseline and three days later during a non-treatment period. Face and content validity, practical characteristics, factor analysis, internal consistency, discriminant validity and convergent validity were assessed from the full sample. Results A total of 27 potential items that had been identified for inclusion were subsequently reduced to 11 by an expert panel. Four items were then removed due to cross-loading under confirmatory factor analysis where a two-factor model yielded a good fit to the data (χ2 = 14.80, df = 13, p = 0.37, CFI = 0.98, and RMSEA = 0.029). The internal consistency was moderate (α = 0.68 for MLBP; 0.72 for ILBP), test-retest reliability high (ICC = 0.91; 95%CI = 0.88-0.93) and discriminant validity good for either MLBP (AUC = 0.74) and ILBP (AUC = 0.92). Convergent validity was demonstrated through similar but weak correlations between the ILBP and both the RMQ and BAI (r = 0.34, p < 0.001) and the MLBP and BAI (r = 0.38, p < 0.001). Conclusions The MIL is a valid and reliable clinical tool for patients with NSLBP that discriminates between mechanical and inflammatory LBP. PMID:24405779

  9. Evaluation of advanced microelectronics for inclusion in MIL-STD-975

    NASA Technical Reports Server (NTRS)

    Scott, W. Richard

    1991-01-01

    The approach taken by NASA and JPL (Jet Propulsion Laboratory) in the development of a MIL-STD-975 section which contains advanced technology such as Large Scale Integration and Very Large Scale Integration (LSI/VLSI) microelectronic devices is described. The parts listed in this section are recommended as satisfactory for NASA flight applications, in the absence of alternate qualified devices, based on satisfactory results of a vendor capability audit, the availability of sufficient characterization and reliability data from the manufacturers and users and negotiated detail procurement specifications. The criteria used in the selection and evaluation of the vendors and candidate parts, the preparation of procurement specifications, and the status of this activity are discussed.

  10. Second harmonic generation microscopy reveals hidden polar organization in fluoride doped MIL-53(Fe).

    PubMed

    Markey, Karen; Putzeys, Tristan; Horcajada, Patricia; Devic, Thomas; Guillou, Nathalie; Wübbenhorst, Michael; Cleuvenbergen, Stijn Van; Verbiest, Thierry; De Vos, Dirk E; van der Veen, Monique A

    2016-03-01

    Polar metal-organic frameworks have potential applications as functional non-linear optical, piezoelectric, pyroelectric and ferroelectric materials. Using second harmonic generation microscopy we found that fluoride doping of the microporous iron(iii) terephthalate MOF MIL-53(Fe) induces a polar organization in its structure, which was not previously detected with XRD. The polar order is only observed when both fluoride and guest molecules are present, and may be related to a complex interplay between the adsorbates and the framework, leading to a modification of the positioning of fluoride in the inorganic Fe-chains. Combined polarized second harmonic generation microscopy and scanning pyroelectric microscopy show that the polar axis is unidirectional and of the same sense over the whole crystal, extending up to 100 micrometers. This finding shows how MOF materials can be endowed with useful properties by doping MOFs with fluoride. PMID:26812223

  11. Reliability improvement of 1 mil aluminum wire bonds for semiconductors, technical performance summary

    NASA Technical Reports Server (NTRS)

    1971-01-01

    The reliability of semiconductor devices as influenced by the reliability of wire bonds used in the assembly of the devices is investigated. The specific type of failure dealt with involves fracture of wire bonds as a result of repeated flexure of the wire at the heel of the bond when the devices are operated in an on-off mode. The mechanism of failure is one of induced fracture of the wire. To improve the reliability of a chosen transistor, one-mil diameter wires of aluminum with various alloy additions were studied using an accelerated fatigue testing machine. In addition, the electroprobe was used to study the metallurgy of the wires as to microstructure and kinetics of the growth of insoluble phases. Thermocompression and ultrasonic bonding techniques were also investigated.

  12. Preliminary SEU analysis of the SAMPEX MIL-STD-1773 space-flight data

    NASA Astrophysics Data System (ADS)

    Crabtree, Christina M.; LaBel, Kenneth A.; Stassinopoulos, E. G.; Miller, Jay T.

    1993-09-01

    The Small Explorer Data System (SEDS) relies heavily on new technologies in the electrical designs. Among the key technologies utilized are fiber optics. The effects of the harsh space radiation environment on these spacecraft components can be quite severe. This paper takes a preliminary look at the single event upset (SEU) data seen during the early portion of SAMPEX flight (launched in July 1992) versus the ground test predictions. The new technologies are addressed along with the error handling abilities of the fiber optic system (MIL-STD-1773). The predicted SAMPEX radiation environment is discussed as well as the methodology of SEU rate prediction utilizing both cosmic ray and proton concerns. A comparison of the flight data to ground test predictions is discussed along with information concerning the significance of where and when the SEUs have occurred.

  13. Handbook for the USAF space environment standard (MIL-STD-1809)

    NASA Astrophysics Data System (ADS)

    1993-01-01

    The Handbook for the Space Environment Standard (MIL-STD-1809) is a companion document to the Standard. The Standard is necessarily a very concise document, so that the Handbook is intended to make its usage easier. The Handbook describes the sources of the environmental models cited in the Standard, as well as the usage of the models, and their limitations. Means for obtaining the cited models are given as well. With the exception of the space debris model, the Handbook covers only the natural space environment. The Handbook provides a general overview of the various components of the space environment and the generally accepted understanding of them at the current time. A bibliography is provided to aid in understanding the materials presented in the Handbook and Standard.

  14. Evaluation of advanced microelectronics for inclusion in MIL-STD-975

    NASA Astrophysics Data System (ADS)

    Scott, W. Richard

    1991-03-01

    The approach taken by NASA and JPL (Jet Propulsion Laboratory) in the development of a MIL-STD-975 section which contains advanced technology such as Large Scale Integration and Very Large Scale Integration (LSI/VLSI) microelectronic devices is described. The parts listed in this section are recommended as satisfactory for NASA flight applications, in the absence of alternate qualified devices, based on satisfactory results of a vendor capability audit, the availability of sufficient characterization and reliability data from the manufacturers and users and negotiated detail procurement specifications. The criteria used in the selection and evaluation of the vendors and candidate parts, the preparation of procurement specifications, and the status of this activity are discussed.

  15. MIL-STD-1553B in MRASM (Medium Range Air to Surface Missile): The designer's challenge

    NASA Astrophysics Data System (ADS)

    Elmore, V. L.

    1982-11-01

    Unique design challenges are created when incorporating MIL-STD-1553B into a low cost tactical missile system. The designer is challenged by the requirement to minimize host computer interaction with bus events, while utilizing off-the-shelf-components on a single 5.8 inch x 4.8 inch printed circuit card. Further demands are imposed by the requirement to integrate the triple functions of bus controller, remote terminal, and monitor terminal into a single design. This paper addresses one set of solutions to these and related problems. The paper will also review the process by which the card was designed, and the solutions to the general challenges faced in any 1553B implementation.

  16. A high performance fibre optic MIL-STD-1553B data bus

    NASA Astrophysics Data System (ADS)

    Chown, D. P. M.; Farrington, J. G.

    Optical-fiber transmission can provide substantial benefits to MIL-STD-1553B data bus systems, most notably complete freedom from interconnect EMC problems. However, the very short intermessage gap specified by the standard has hitherto confined passive optical interconnect (POI) implementations to those based on a single star coupler. Here, an efficient 'local star coupler' POI, which can be flexibility tailored for use in a wide range of installations, is proposed. This concept has been made feasibile by the development of a fiber-optic transceiver which embodies novel coding and receiver design features. These allow it to achieve sufficient sensitivity and dynamic range, in full compliance with 1553B timing, throughout a military avionics temperature range. The overall system has been proven by a successful demonstration rig.

  17. A dual speed, MIL-STD-1553B compatible fiber optic data bus

    NASA Astrophysics Data System (ADS)

    Blaha, M. S.; Degennaro, C. H.; Utley, S. F.

    A demonstration system of a dual speed, fiber optic data bus is described. This work is based on a previously described concept (1) which envisioned a data bus populated with MIL-STD-1553B avionic components which evolve as equipment is upgraded to higher data rates. The approach described herein provides for the coexistence of bus nodes operating at 1 Mb/s, and 20 Mb/s, on a single fiber bus medium. The 1 Mb/s interface of each node is 1553B compatible, making use of readily available hardware and software. Both existing, 1 Mb/s 1553B compatible interfaces and new equipment operating at 20 Mb/s have been shown to work simultaneously on the single bus structure. The design provides a sound, low-risk method for transitioning from current 1 Mb/s equipment to a unified bus structure incorporating both existing 1553B compatible components and newly designed higher speed equipment.

  18. Reassessing the cooling rate and geologic setting of Martian meteorites MIL 03346 and NWA 817

    NASA Astrophysics Data System (ADS)

    Richter, Frank; Chaussidon, Marc; Mendybaev, Ruslan; Kite, Edwin

    2016-06-01

    Lithium concentration and isotopic fractionation profiles across augite grains from two Martian meteorites - MIL 03346 and NWA 817 - were used to determine their thermal history and implications for their geologic setting. The iron-magnesium zoning and associated magnesium isotopic fractionation of olivine grains from NWA 817 were also measured and provide a separate estimate of the cooling rate. The observed correlation of concentration with isotopic fractionation provides the essential evidence that the zoning of these grains was in fact due to diffusion and thus can be used as a measure of their cooling rate. The diffusion rate of lithium in augite depends on the oxygen fugacity, which has to be taken into account when determining a cooling rate based on the lithium zoning. The Fe-Mg exchange in olivine is much less sensitive to oxygen fugacity, but it is significantly anisotropic and for this reason we determined the direction relative to crystallographic axes of the line along which the Fe-Mg zoning was measured. We found that the cooling rate of NWA 817 determined from the lithium zoning in augite grains and that based on the Fe-Mg zoning of olivines are in good agreement at an oxygen fugacity close to that of quartz-fayalite-magnetite oxygen buffer. The cooling rate of MIL 03346 was found to be resolvably faster than that of NWA 817 - of the order of 1 °C/h for the former and of the order of 0.2 °C/h for the latter. An important observation regarding the history of MIL 03346 and NWA 817 is that the lithium and Fe-Mg zoning are only observed where the augite or olivine is in contact with the mesostasis, which implies that they were already about 80% crystallized at the time diffusion began. The augite and olivine core compositions while very homogeneous are not in equilibrium with each other, which we interpret to imply that prior to the rapid cooling there must have been a protracted period of the order of years above the solidus, during which the much faster Fe-Mg exchange in olivine compared to that in augite allowed the olivine to maintain equilibrium with a changing melt composition while the augite was not significantly affected. We suggest two possible geological settings for the origin and evolution of MIL 03346 and NWA 817: (1) a slow cooling stage in a crystallization front in a crustal magma chamber, followed by eruption of melt plus portions of the crystallization front onto the surface where the final fast cooling took place at the bottom of a lava flow or melt pond, and (2) eruption of a crystal laden melt as a thick long-lived lava flow where the crystals continued to grow as a cumulate and were rapidly cooled when the overlying lava layer was suddenly drained.

  19. 129Xe NMR study of the framework flexibility of the porous hybrid MIL-53(Al).

    PubMed

    Springuel-Huet, Marie-Anne; Nossov, Andrei; Adem, Ziad; Guenneau, Flavien; Volkringer, Christophe; Loiseau, Thierry; Férey, Gérard; Gédéon, Antoine

    2010-08-25

    The metal-organic framework MIL-53 exhibits a structural transition between two possible porous structures, so-called large-pore (lp) and narrow-pore (np) forms, depending on the temperature or when guest molecules are adsorbed. (129)Xe NMR has been used to study the lp --> np transition induced by the adsorption of xenon as revealed by the adsorption isotherms. The NMR spectra show that the two structures, characterized by two distinct lines, coexist for xenon pressures above 5 x 10(4) Pa at room temperature, but a complete transformation is achieved when the temperature is decreased. An original interpretation of the NMR results allowed us to quantify the rate of the structural transformation. In particular, at room temperature, we have shown that 28% of the channels remain open. Two possible interpretations of the hysteresis observed in the chemical shift variation versus xenon pressure are proposed. PMID:20681589

  20. MIL-STD-1553 dynamic bus controller/remote terminal hybrid set

    NASA Astrophysics Data System (ADS)

    Friedman, S. N.

    This paper describes the performance, physical and electrical requirements of a Dual Redundant BUS Interface Unit (BIU) acting as a BUS Controller Interface Unit (BCIU) or Remote Terminal Unit (RTU) between a Motorola 68000 VME BUS and MIL-STD-1553B Multiplex Data Bus. A discussion of how the BIU Hybrid set is programmed, and operates as a BCIU or RTU, will be included. This paper will review Dynamic Bus Control and other Mode Code capabilities. The BIU Hybrid Set interfaces to a 68000 Microprocessor with a VME Bus using programmed I/O transfers. This special interface will be discussed along with the internal Dual Access Memory (4K x 16) used to support the data exchanges between the CPU and the BIU Hybrid Set. The hybrid set's physical size and power requirements will be covered. This includes the present Double Eurocard the BIU function is presently being offered on.

  1. Goals and Progress for Mil Handbook 17, Vol. 5 on Ceramic Matrix Composites: Testing and Characterization

    NASA Technical Reports Server (NTRS)

    Verrilli, Michael J.; Gonczy, Stephen

    2004-01-01

    The initial edition of the Mil Handbook 17, Vol. 5 on ceramic matrix composites (CMCs) was recently published. Part C of this CMC volume describes procedures for characterization of the thermal, physical, and mechanical properties of CMCs and subsequent data analysis procedures. As is the case for entire CMC volume, this chapter is a "work in progress" with sections on recommended test plans and matrices, data reduction, and test methods. This presentation will describe the current status in development of this section of the CMC volume and will highlight examples of critical issues that will be addressed in this volume. CMC systems are a different class of material than metals or polymer matrix composite with different mechanical response and failure modes, design rules, test methods, and characterization techniques. The CMC test protocols need to include guidance on how to generate enough reliable data in order to estimate, with reasonable confidence, the lower bounds of performance properties, such as strength and life. Strength data sets on two material systems, C/SiC and Nicalon/SiNC, and a creep rupture data set on C/SiC, will be presented to highlight this issue. The structural properties of CMC parts can sometimes be significantly different than those obtained from flat panels because of changes in fiber architecture often required to make shapes and spatial and lot-to-lot variations in processing conditions. To illustrate an example, the hoop tensile properties of SiC/SiC cylinders will be compared to properties obtained from flat panels fabricated from the same composites. These CMC testing-design issues are being defined and documented in the Mil Handbook 17 CMC volume.

  2. Selective recognition of 6-mercaptopurine based on luminescent metal-organic frameworks Fe-MIL-88NH2

    NASA Astrophysics Data System (ADS)

    Sun, Zhengjuan; Liu, Yali; Li, Yuanfang

    2015-03-01

    A novel and rapid spectrofluorometry method for the recognition of 6-mercaptopurine (6-MP) has been developed based on luminescent metal-organic frameworks Fe-MIL-88NH2 as fluorescent probe. The strong fluorescence of Fe-MIL-88NH2 at 430 nm could be quenched by 6-MP directly, and the Fe-MIL-88NH2 shows high selectivity for 6-MP compared to other thiol-containing amino acids such as homocysteine (Hcy), cysteine (Cys), glutathione (GSH), etc. Under optimal conditions, the relative fluorescence intensity was linearly proportional to the concentration of 6-MP in the range of 5-600 μM with the detection limit at 1.17 μM (S/N = 3). Furthermore, the present approach has been successfully applied to the determination of 6-MP in human serum samples. The possible fluorescence quenching mechanism has also been investigated, where it is revealed that the quenching was attributed to competition of absorption of the light source energy as well as electron transfer between Fe-MIL-88NH2 and 6-MP.

  3. Fluorescent metal-organic framework MIL-53(Al) for highly selective and sensitive detection of Fe3+ in aqueous solution.

    PubMed

    Yang, Cheng-Xiong; Ren, Hu-Bo; Yan, Xiu-Ping

    2013-08-01

    Fluorescent metal-organic frameworks (MOFs) have received great attention in sensing application. Here, we report the exploration of fluorescent MIL-53(Al) for highly selective and sensitive detection of Fe(3+) in aqueous solution. The cation exchange between Fe(3+) and the framework metal ion Al(3+) in MIL-53(Al) led to the quenching of the fluorescence of MIL-53(Al) due to the transformation of strong-fluorescent MIL-53(Al) to weak-fluorescent MIL-53(Fe), allowing highly selective and sensitive detection of Fe(3+) in aqueous solution with a linear range of 3-200 μM and a detection limit of 0.9 μM. No interferences from 0.8 M Na(+); 0.35 M K(+); 11 mM Cu(2+); 10 mM Ni(2+); 6 mM Ca(2+), Pb(2+), and Al(3+); 5.5 mM Mn(2+); 5 mM Co(2+) and Cr(3+); 4 mM Hg(2+), Cd(2+), Zn(2+), and Mg(2+); 3 mM Fe(2+); 0.8 M Cl(-); 60 mM NO2(-) and NO3(-); 10 mM HPO4(2-), H2PO4(-), SO3(2-), SO4(2-), and HCOO(-); 8 mM CO3(2-), HCO3(-), and C2O4(2-); and 5 mM CH3COO(-) were found for the detection of 150 μM Fe(3+). The possible mechanism for the quenching effect of Fe(3+) on the fluorescence of MIL-53(Al) was elucidated by inductively coupled plasma-mass spectrometry, X-ray diffraction spectrometry, and Fourier transform infrared spectrometry. The specific cation exchange behavior between Fe(3+) and the framework Al(3+) along with the excellent stability of MIL-53(Al) allows highly selective and sensitive detection of Fe(3+) in aqueous solution. The developed method was applied to the determination of Fe(3+) in human urine samples with the quantitative spike recoveries from 98.2% to 106.2%. PMID:23826852

  4. Synthesis and characterization of mangenese(III) porphyrin supported on imidazole modified chloromethylated MIL-101(Cr): A heterogeneous and reusable catalyst for oxidation of hydrocarbons with sodium periodate

    NASA Astrophysics Data System (ADS)

    Zadehahmadi, Farnaz; Tangestaninejad, Shahram; Moghadam, Majid; Mirkhani, Valiollah; Mohammadpoor-Baltork, Iraj; Khosropour, Ahmad R.; Kardanpour, Reihaneh

    2014-10-01

    In the present work, chloromethylated MIL-101(Cr) modified with imidazole, Im-MIL-101, was applied as a support for immobilizing of tetraphenylporphyrinatomangenese(III) chloride. The imidazole-bound MIL-101, Im-MIL-101, not only used as support for immobilization of manganese porphyrin but also applied as a heterogeneous axial base. The Mn(TPP)Cl@Im-MIL-101 catalyst was characterized by UV-vis, FT-IR, X-ray diffraction (XRD), N2 adsorption, field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray (EDX), elemental analysis and inductively coupled plasma (ICP) methods. The catalytic activity of this new catalytic system was investigated in the alkene epoxidation and alkane hydroxylation using NaIO4 as an oxidant in CH3CN/H2O at room temperature. This heterogeneous catalyst is highly efficient, stable and reusable in the oxidation of hydrocarbons.

  5. Co-adsorption and separation of CO2-CH4 mixtures in the highly flexible MIL-53(Cr) MOF.

    PubMed

    Hamon, Lomig; Llewellyn, Philip L; Devic, Thomas; Ghoufi, Aziz; Clet, Guillaume; Guillerm, Vincent; Pirngruber, Gerhard D; Maurin, Guillaume; Serre, Christian; Driver, Gordon; van Beek, Wouter; Jolimaître, Elsa; Vimont, Alexandre; Daturi, Marco; Férey, Gérard

    2009-12-01

    The present study attempts to understand the use of the flexible porous chromium terephthalate Cr(OH)(O(2)C-C(6)H(4)-CO(2)) denoted MIL-53(Cr) (MIL = Material from Institut Lavoisier) for the separation of mixtures of CO(2) and CH(4) at ambient temperature. The coadsorption of CO(2) and CH(4) was studied by a variety of different techniques. In situ synchrotron X-ray Powder Diffraction allowed study of the breathing of the solid upon adsorption of the gas mixtures and simultaneously measured Raman spectra yielded an estimation of the adsorbed quantities of CO(2) and CH(4), as well as a quantification of the fraction of the narrow pore (NP) and the large pore (LP) form of MIL-53. Quantitative coadsorption data were then measured by gravimetry and by breakthrough curves. In addition, computer simulation was performed to calculate the composition of the adsorbed phase in comparison with experimental equilibrium isotherms and breakthrough results. The body of results shows that the coadsorption of CO(2) and CH(4) leads to a similar breathing of MIL-53(Cr) as with pure CO(2). The breathing is mainly controlled by the partial pressure of CO(2), but increasing the CH(4) content progressively decreases the transformation of LP to NP. CH(4) seems to be excluded from the NP form, which is filled exclusively by CO(2) molecules. The consequences in terms of CO(2)/CH(4) selectivity and the possible use of MIL-53(Cr) in a PSA process are discussed. PMID:19904944

  6. Synthesis and characterization of mangenese(III) porphyrin supported on imidazole modified chloromethylated MIL-101(Cr): A heterogeneous and reusable catalyst for oxidation of hydrocarbons with sodium periodate

    SciTech Connect

    Zadehahmadi, Farnaz; Tangestaninejad, Shahram Moghadam, Majid Mirkhani, Valiollah Mohammadpoor-Baltork, Iraj; Khosropour, Ahmad R.; Kardanpour, Reihaneh

    2014-10-15

    In the present work, chloromethylated MIL-101(Cr) modified with imidazole, Im-MIL-101, was applied as a support for immobilizing of tetraphenylporphyrinatomangenese(III) chloride. The imidazole-bound MIL-101, Im-MIL-101, not only used as support for immobilization of manganese porphyrin but also applied as a heterogeneous axial base. The Mn(TPP)Cl@Im-MIL-101 catalyst was characterized by UV–vis, FT-IR, X-ray diffraction (XRD), N{sub 2} adsorption, field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray (EDX), elemental analysis and inductively coupled plasma (ICP) methods. The catalytic activity of this new catalytic system was investigated in the alkene epoxidation and alkane hydroxylation using NaIO{sub 4} as an oxidant in CH{sub 3}CN/H{sub 2}O at room temperature. This heterogeneous catalyst is highly efficient, stable and reusable in the oxidation of hydrocarbons. - Highlights: • MIL-101 was modified by covalent post synthetic modification. • Mn(TPP)Cl was anchored to imidazole modified MIL-101 by covalent attachment. • A heterogeneous catalyst was prepared. • The catalyst was used for epoxidation of alkenes and hydroxylation of alkanes. • The catalyst was reusable.

  7. Ni-Pt nanoparticles growing on metal organic frameworks (MIL-96) with enhanced catalytic activity for hydrogen generation from hydrazine at room temperature.

    PubMed

    Wen, Lan; Du, Xiaoqiong; Su, Jun; Luo, Wei; Cai, Ping; Cheng, Gongzhen

    2015-04-01

    Well-dispersed bimetallic Ni-Pt nanoparticles (NPs) with different compositions have been successfully grown on the MIL-96 by a simple liquid impregnation method using NaBH4 as the reducing agent. Powder X-ray diffraction, transmission electron microscopy, energy-dispersive X-ray spectroscopy, N2 adsorption-desorption, and inductively coupled plasma-atomic emission spectroscopy measurements were employed to characterize the NiPt/MIL-96. Catalytic activity of NiPt/MIL-96 catalysts was tested in the hydrogen generation from the aqueous alkaline solution of hydrazine at room temperature. These catalysts are composition dependent on their catalytic activity, while Ni64Pt36/MIL-96 exhibits the highest catalytic activity among all the catalysts tested, with a turnover frequency value of 114.3 h(-1) and 100% hydrogen selectivity. This excellent catalytic performance might be due to the synergistic effect of the MIL-96 support and NiPt NPs, while NiPt NPs supported on other conventional supports, such as SiO2, carbon black, γ-Al2O3, poly(N-vinyl-2-pyrrolidone) (PVP), and the physical mixture of NiPt and MIL-96, all of them exhibit inferior catalytic activity compared to that of NiPt/MIL-96. PMID:25737162

  8. Implementation of Ada protocols on Mil-STD-1553 B data bus

    NASA Technical Reports Server (NTRS)

    Ruhman, Smil; Rosemberg, Flavia

    1986-01-01

    Standardization activity of data communication in avionic systems started in 1968 for the purpose of total system integration and the elimination of heavy wire bundles carrying signals between various subassemblies. The growing complexity of avionic systems is straining the capabilities of MIL-STD-1553 B (first issued in 1973), but a much greater challenge to it is posed by Ada, the standard language adopted for real-time, computer embedded-systems. Hardware implementation of Ada communication protocols in a contention/token bus or token ring network is proposed. However, during the transition period when the current command/response multiplex data bus is still flourishing and the development environment for distributed multi-computer Ada systems is as yet lacking, a temporary accomodation of the standard language with the standard bus could be very useful and even highly desirable. By concentrating all status informtion and decisions at the bus controller, it was found to be possible to construct an elegant and efficient harware impelementation of the Ada protocols at the bus interface. This solution is discussed.

  9. Petrology and Geochemistry of Unbrecciated Harzburgitic Diogenite MIL 07001: A Window Into Vestan Geological Evolution

    NASA Technical Reports Server (NTRS)

    Mittlefehldt, D. W.; Peng, Z. X.; Mertzman, S. A.; Mertzman, K. R.

    2014-01-01

    There is a strong case that asteroid 4 Vesta is the parent of the howardite, eucrite and diogenite (HED) meteorites. Models developed for the geological evolution of Vesta can satisfy the compositions of basaltic eucrites that dominate in the upper crust. The bulk compositional characteristics of diogenites - cumulate harzburgites and orthopyroxenites from the lower crust - do not fit into global magma ocean models that can describe the compositions of basaltic and cumulate eucrites. Recent more detailed formation models do make provision for a more complicated origin for diogenites, but this model has yet to be completely vetted. Compositional studies of bulk samples has led to the hypothesis that many diogenites were formed late by interaction of their parent melts with a eucritic crust, but those observations may alternatively be explained by subsolidus equilibration of trace elements between orthopyroxene and plagioclase and Ca-phosphate in the rocks. Differences in radiogenic Mg-26 content between diogenites and eucrites favors early formation of the former, not later formation. Understanding the origin of diogenites is crucial for understanding the petrologic evolution of Vesta. We have been doing coordinated studies of a suite of diogenites including petrologic investigations, bulk rock major and trace element studies, and in situ trace element analyses of orthopyroxene. Here we will focus on an especially unusual, and potentially key, diogenite, MIL 07001.

  10. Hydrocarbon adsorption in the flexible metal organic frameworks MIL-53(Al, Cr).

    PubMed

    Trung, Thuy Khuong; Trens, Philippe; Tanchoux, Nathalie; Bourrelly, Sandrine; Llewellyn, Philip L; Loera-Serna, Sandra; Serre, Christian; Loiseau, Thierry; Fajula, François; Férey, Gérard

    2008-12-17

    A general study of the adsorption of n-alkanes in the flexible metal organic framework (MOF) MIL-53 is presented. The roles of the length of the alkyl chain (n = 1-9), the nature of the metal (Al, Cr), and temperature were investigated. The shape of the adsorption curves is driven by the alkyl chain length of the n-alkanes. While traditional type-I isotherms are observed for short alkanes (n = 1, 2), adsorbates with longer chains induce clear substeps in the isotherm curves whose positions depend on the chain length. Such substeps are due to a breathing phenomenon, as proven by ex situ X-ray diffraction analysis. They strongly depend on the amount of adsorbate in the pores and on the nature of the metal (Al, Cr), which, for a given alkane, leads to a strong change in the substep positions despite the similar characteristics of the two metals. The adsorption kinetics are highly sensitive to small variations in temperature. Their detailed analysis in different regions of the isotherms shows in some cases the existence of distinct diffusion regimes and/or conformations within the flexible phases. PMID:19053405

  11. Complexity behind CO2 capture on NH2-MIL-53(Al).

    PubMed

    Stavitski, Eli; Pidko, Evgeny A; Couck, Sarah; Remy, Tom; Hensen, Emiel J M; Weckhuysen, Bert M; Denayer, Joeri; Gascon, Jorge; Kapteijn, Freek

    2011-04-01

    Some Metal Organic Frameworks (MOFs) show excellent performance in extracting carbon dioxide from different gas mixtures. The origin of their enhanced separation ability is not clear yet. Herein, we present a combined experimental and theoretical study of the amino-functionalized MIL-53(Al) to elucidate the mechanism behind its unusual high efficiency in CO(2) capture. Spectroscopic and DFT studies point out only an indirect role of amine moieties. In contrast to other amino-functionalized CO(2) sorbents, no chemical bond between CO(2) and the NH(2) groups of the structure is formed. We demonstrate that the functionalization modulates the "breathing" behavior of the material, that is, the flexibility of the framework and its capacity to alter the structure upon the introduction of specific adsorbates. The absence of strong chemical interactions with CO(2) is of high importance for the overall performance of the adsorbent, since full regeneration can be achieved within minutes under very mild conditions, demonstrating the high potential of this type of adsorbents for PSA like systems. PMID:21375222

  12. Two distinct redox intercalation reactions of hydroquinone with porous vanadium benzenedicarboxylate MIL-47.

    PubMed

    Kaveevivitchai, Watchareeya; Wang, Xiqu; Liu, Lumei; Jacobson, Allan J

    2015-02-16

    One of the enticing features of metal-organic frameworks (MOFs) is the potential to control the chemical and physical nature of the pores through postsynthetic modification. The incorporation of redox active guest molecules inside the pores of the framework represents one strategy toward improving the charge transport properties of MOFs. Herein, we report the vapor-phase redox intercalation of an electroactive organic compound, hydroquinone (H2Q) or benzene-1,4-diol, into the channels of the host [V(IV)O(bdc)], (bdc =1,4-benzenedicarboxylate) conventionally denoted as MIL-47. The temperatures and especially the atmosphere in which the reactions took place were found to determine the products. In ambient atmosphere, quinhydrone charge-transfer complexes are formed inside the channels. Under anhydrous conditions, the framework itself was functionalized by a radical anion species derived from the pyrolysis of hydroquinone. Both cases are accompanied by the reduction of V(4+) to V(3+) via single-crystal-to-single-crystal transformations. The products were characterized by single crystal X-ray diffraction, thermogravimetric analysis, infrared spectroscopy, and electron paramagnetic resonance spectroscopy. PMID:25607937

  13. Advances in uncooled 1-mil pixel size focal plane products at DRS

    NASA Astrophysics Data System (ADS)

    Howard, Philip E.; Clarke, John E.; Ionescu, Adrian C.; Li, Chuan; Frankenberger, Arnold

    2004-08-01

    DRS has developed and demonstrated a family of miniaturized, low-power uncooled infrared focal plane camera products integrated with our 1-mil pixel size 640 x 480 and 320 x 240 uncooled infrared focal plane arrays (UIRFPA). The UIRFPA cameras operate from -40C to +55C without UIRFPA temperature regulation using our patented TCOMP sensor concept. Furthermore, they are software based, with significant memory and signal processing overcapacity, which supports significant camera setup reconfigurations without having to undergo camera firmware and hardware modifications. The elimination of the UIRFPA temperature regulation requirement results in reduced sensor power and prompt sensor turn-on. The new 320 x 240 camera weighs less than a quarter pound (including batteries and a 23 mm aperture F/1.2 optic), and dissipates approximately one watt when operated at a full 60 Hz frame rate. The 640 x 480 camera dissipates about two watts when operated at a TV compatible 30 Hz frame rate. This paper describes the UIRFPA camera products, their features and capabilities, and their key performance characteristics. Illustrative examples of thermal image quality are also included.

  14. High-performance liquid chromatographic separation of position isomers using metal-organic framework MIL-53(Al) as the stationary phase.

    PubMed

    Yang, Cheng-Xiong; Liu, Shan-Shan; Wang, He-Fang; Wang, Shan-Wei; Yan, Xiu-Ping

    2012-01-01

    Metal-organic framework MIL-53(Al) was explored as the stationary phase for high-performance liquid chromatographic separation of position isomers using a binary and/or polar mobile phase. Baseline separations of xylene, dichlorobenzene, chlorotoluene and nitrophenol isomers were achieved on the slurry-packed MIL-53(Al) column with high resolution and good precision. The effects of mobile phase composition, injected sample mass and temperature were investigated. The separation of xylene, dichlorobenzene, chlorotoluene and nitrophenol isomers on MIL-53(Al) were controlled by entropy change. PMID:22034617

  15. SEDS MIL-STD-1773 fiber optic data bus: Proton irradiation test results and spaceflight SEU data

    SciTech Connect

    LaBel, K.A.; Stassinopoulos, E.G.; Miller, J.T. ); Marshall, P. ); Dale, C. ); Crabtree, C.M. ); Gates, M.M. )

    1993-12-01

    The Small Explorer Data System (SEDS) was launched in July of 1992 as part of the Solar Anomalous Magnetospheric Particle Explorer (SAMPEX) mission. The SEDS utilizes NASA's first MIL-STD-1773 Fiber Optic Multiplexed Data Bus (or 1773 bus) to communicate with other spacecraft subsystems in the space environment. The 1773 bus is the fiber optic version of the MIL-STD-1553 Data Bus, a electronic wire bus used in many avionics applications. The authors present proton test and space flight single event effect data for NASA's first fiber optic data bus. Bit error rate predictions based on a new proton direct ionization model agree well with flight data for proton belt and solar flare effects.

  16. Proton irradiation SEU test results for the SEDS MIL-STD-1773 fiber optic data bus: integrated optoelectronics

    NASA Astrophysics Data System (ADS)

    LaBel, Kenneth A.; Stassinopoulos, E. G.; Marshall, Paul W.; Petersen, Ed L.; Dale, Cheryl J.; Crabtree, Christina M.; Stauffer, Craig A.

    1993-09-01

    The Small Explorer Data System (SEDS) is a spaceflight command and data handling system for the small explorer (SMEX) program at Goddard Space Flight Center (GSFC). A key component in this system is the SEDS MIL-STD-1773 Fiber Optic Multiplexed Data Bus. The 1773 bus provides a means of passing telemetry and commands between spacecraft subsystems. This bus is currently being considered for additional spaceflight programs inside and outside of the NASA realm. The SEDS 1773 bus uses integrated optoelectronics as part of its electrical subsystem (or user) to optical interface. Generic proton and heavy ion test results have been previously reported. Herein is presented proton test results for continuing this investigation under actual subsystem interface conditions (MIL-STD-1773) as well as for generic devices using the proton test facilities at University of California, Davis (UCD). This testing was undertaken as a joint effort between NASA/GSFC and the Naval Research Laboratories (NRL).

  17. Catalytic hydrothermal conversion of carboxymethyl cellulose to value-added chemicals over metal-organic framework MIL-53(Al).

    PubMed

    Zi, Guoli; Yan, Zhiying; Wang, Yangxia; Chen, Yongjuan; Guo, Yunlong; Yuan, Fagui; Gao, Wenyu; Wang, Yanmei; Wang, Jiaqiang

    2015-01-22

    Catalytic hydrolysis of biomass over solid catalysts can be one of the most efficient pathways for a future sustainable society dependent on cellulose biomass. In this work metal-organic framework MIL-53(Al) without any functionalization was directly employed as an efficient heterogeneous catalyst for the hydrolysis of carboxymethyl cellulose (CMC) to 5-hydroxymethyl-furaldehyde (5-HMF) in aqueous phase. A 5-HMF molar yield of 40.3% and total reducing sugar (TRS) molar yield of 54.2% were obtained with water as single solvent at 473 K for 4 h. The catalyst could be reused three times without losing activity to a greater extent. With the remarkable advantages such as the use of water as single solvent and MIL-53(Al) as a novel heterogeneous green catalyst, the work provides a new platform for the production of value added chemicals and liquid fuels from biomass. PMID:25439879

  18. Interaction of methanol with the flexible metal-organic framework MIL-53(Fe) observed by inelastic neutron scattering

    NASA Astrophysics Data System (ADS)

    Munn, Alexis S.; Ramirez-Cuesta, Anibal J.; Millange, Franck; Walton, Richard I.

    2013-12-01

    In situ powder X-ray diffraction and thermogravimetry show that the iron(III) carboxylate material MIL-53(Fe) expands in two steps upon exposure to methanol vapour to give a ‘half open’ phase and then a fully expanded structure; these correspond to the uptake of one and two molar equivalents of methanol, respectively. This knowledge allows interpretation of inelastic neutron scattering (INS) spectra, measured using TOSCA at ISIS, of the solid loaded with various amounts of water, methanol or d3-methanol (CD3OH), aided also by DFT simulation of INS spectra of the analogous MIL-53(Al) structure. The key signature of the expansion and contraction of the structure is the shift of bands in the 400 cm-1 region: these are assigned as due to the librations of the terephthalate rings, involving motions that result in distortion of the aromatic ring and a rocking motion of the aromatic ring about the bonds to the carboxylate groups.

  19. A single-supply, monolithic, MIL-STD-1553 transceiver implemented in BiCMOS wafer fabrication technology

    NASA Astrophysics Data System (ADS)

    Albrecht, Thomas L.; Molinari, Lou

    An integrated circuit has been designed for use as a single supply, MIL-STD-1553 transceiver using BiCMOS technology. Use of the BiCMOS fabrication process has advantages over both Bipolar and CMOS technologies. These advantages include: reduced standby current drain, increased flexibility in mating the transceiver to various remote terminals, increased control over output amplitude and rise/fall times, easier methods for adjusting filter response and residual voltage, and reduced chip size (over a CMOS transceiver). Development of this monolithic transceiver opens the door to future advances in remote terminal design. By combining the current driving capacity of Bipolar with the digital design capability of CMOS, the next probable step in the progression of MIL-STD-1553 technology would be a fully monolithic remote terminal. This device would combine a transceiver with the encoder/decoder and protocol logic on a single semiconductor device.

  20. Analysis of a MIL-L-27502 lubricant from a gas-turbine engine test by size-exclusion chromatography

    NASA Technical Reports Server (NTRS)

    Jones, W. R., Jr.; Morales, W.

    1983-01-01

    Size exclusion chromatography was used to determine the chemical degradation of MIL-L-27502 oil samples from a gas turbine engine test run at a bulk oil temperature of 216 C. Results revealed a progressive loss of primary ester and additive depletion and the formation of higher molecular weight products with time. The high molecular weight products absorbed strongly in the ultraviolet indicating the presence of chromophoric groups.

  1. Fe-MIL-101 exhibits selective cytotoxicity and inhibition of angiogenesis in ovarian cancer cells via downregulation of MMP.

    PubMed

    Wang, Jiaqiang; Chen, Daomei; Li, Bin; He, Jiao; Duan, Deliang; Shao, Dandan; Nie, Minfang

    2016-01-01

    Though metal-organic frameworks (MOFs) have inspired potential applications in biomedicine, cytotoxicity studies of MOFs have been relatively rare. Here we demonstrate for the first time that an easily available MOF, Fe-MIL-101, possesses intrinsic activity against human SKOV3 ovarian cancer cells and suppress the proliferation of SKOV3 cells (IC50 = 23.6 μg mL(-1)) and normal mouse embryonic fibroblasts (BABL-3T3, IC50 = 78.3 μg mL(-1)) cells. It was more effective against SKOV3 cells than typical anticancer drugs such as artesunate (ART, IC50 = 96.9 μg mL(-1)) and oxaliplatin (OXA, IC50 = 64.4 μg mL(-1)), but had less effect on normal BABL-3T3 cells compared with ART (IC50 = 36.6 μg mL(-1)) and OXA (IC50 = 13.8 μg mL(-1)). Fe-MIL-101 induced apoptosis of human umbilical vein endothelial cells (HUVECs) via G0/G1 cell cycle arrest and decreased the mitochondrial membrane potential in HUVECs and induced apoptosis. Furthermore, Fe-MIL-101 exhibited stronger antiangiogenic effects in HUVEC cells than antiangiogenic inhibitor (SU5416) via downregulation the expression of MMP-2/9. Our results reveal a new role of Fe-MIL-101 as a novel, non-toxic anti-angiogenic agent that restricted ovarian tumour growth. These findings could open a new avenue of using MOFs as potential therapeutics in angiogenesis-dependent diseases, including ovarian cancer. PMID:27188337

  2. Design of a Conducting Metal-Organic Framework: Orbital-Level Matching in MIL-140A Derivatives.

    PubMed

    Komatsu, Tokutaro; Taylor, Jared M; Kitagawa, Hiroshi

    2016-01-19

    On the basis of the results of first-principles band calculations, we report a strategy for the development of a conducting metal-organic framework (MOF). The charge carrier in a zirconium-based MOF, MIL-140A, is expected to be localized because of a mismatch of the energy levels of bridging ligands' π* and Zr 4d orbitals. On the basis of the findings, we propose a candidate structure for a conducting MOF. PMID:26704931

  3. Raster data transfer test using DATA DEVELOPMENT Inc. produced data: MIL-R-28002 Type I Raster

    SciTech Connect

    Not Available

    1992-03-18

    The DoD Computer-aided Acquisition and Logistic Support (CALS) Test Network (CTN) is conducting tests of the military standard for the Automated Interchange of Technical Information, MIL-STD-1840A, and its companion suite of specifications. The CTN is a DoD-sponsored confederation of voluntary participants from industry and government, managed by the Air Force Logistics Command. The primary purpose of the CTN is to evaluate the effectiveness of the CALS standards for technical data interchange and to demonstrate the capability and operational suitability of these standards. To this end, testing should represent the systems and applications in use by a large number of participants. Sampling a wide cross-section of industry and government will gain feedback on the various interpretations of the standards and broaden the base of industry participation in the CALS initiative. This test was conducted to allow DATA DEVELOPMENT, Inc, to demonstrate their ability to generate a MIL-R-28002 data file. The objective was to evaluate their interpretation of the MIL-R-28002 standards, thereby assisting the CTN in substantiating the validity of the standards or recommending changes to these standards and the references to national or international standards. Additionally, Quick Short Test Reports (QSTRS) are intended to promote industry and government participation in the CALS initiative, developing a level of confidence in the technology, and furthering mission objectives.

  4. Experimental and computational investigation of CO2 capture on amine grafted metal-organic framework NH2-MIL-101

    NASA Astrophysics Data System (ADS)

    Huang, Xiang; Lu, Jianfeng; Wang, Weilong; Wei, Xiaolan; Ding, Jing

    2016-05-01

    A standard metal-organic framework, NH2-MIL-101 based on chromium has been synthesized. For the purpose of offering more binding sites for CO2, post-synthetic modification of tetraethylenepentamine (TEPA) was conducted by using a wet impregnation method. With the aim of better understanding the thermodynamics and mechanisms of CO2 adsorption, molecular dynamics (MD) simulations have been used for structures optimization and adsorption kinetics of NH2-MIL-101/TEPA adsorbents, and the CO2 adsorption capacity with different TEPA loadings was simulated by the Monte Carlo (MC) method. Results confirmed that TEPA was successfully grafted on the coordinative unsaturated metal centers. At 1 bar and 298 K, NH2-MIL-101 combined with 50 wt% TEPA exhibited a CO2 uptake of 3.1 mmol/g-sorb. Under low loading of TEPA, the coordinative unsaturated metal centers made a relatively big contribution to CO2 adsorption. With more TEPA incorporated, the CO2 binding affinity was enhanced due to the existence of abundant amine groups. On the basis of both experimental and simulation analysis, this synthesized amine-grafted sorbent with excellent CO2 capture performance is an ideal material for greenhouse gas control.

  5. Multiphysics Modeling and Simulations of Mil A46100 Armor-Grade Martensitic Steel Gas Metal Arc Welding Process

    NASA Astrophysics Data System (ADS)

    Grujicic, M.; Ramaswami, S.; Snipes, J. S.; Yen, C.-F.; Cheeseman, B. A.; Montgomery, J. S.

    2013-10-01

    A multiphysics computational model has been developed for the conventional Gas Metal Arc Welding (GMAW) joining process and used to analyze butt-welding of MIL A46100, a prototypical high-hardness armor martensitic steel. The model consists of five distinct modules, each covering a specific aspect of the GMAW process, i.e., (a) dynamics of welding-gun behavior; (b) heat transfer from the electric arc and mass transfer from the electrode to the weld; (c) development of thermal and mechanical fields during the GMAW process; (d) the associated evolution and spatial distribution of the material microstructure throughout the weld region; and (e) the final spatial distribution of the as-welded material properties. To make the newly developed GMAW process model applicable to MIL A46100, the basic physical-metallurgy concepts and principles for this material have to be investigated and properly accounted for/modeled. The newly developed GMAW process model enables establishment of the relationship between the GMAW process parameters (e.g., open circuit voltage, welding current, electrode diameter, electrode-tip/weld distance, filler-metal feed speed, and gun travel speed), workpiece material chemistry, and the spatial distribution of as-welded material microstructure and properties. The predictions of the present GMAW model pertaining to the spatial distribution of the material microstructure and properties within the MIL A46100 weld region are found to be consistent with general expectations and prior observations.

  6. Connecting defects and amorphization in UiO-66 and MIL-140 metal–organic frameworks: a combined experimental and computational study.

    PubMed

    Bennett, Thomas D; Todorova, Tanya K; Baxter, Emma F; Reid, David G; Gervais, Christel; Bueken, Bart; Van de Voorde, B; De Vos, Dirk; Keen, David A; Mellot-Draznieks, Caroline

    2016-01-21

    The mechanism and products of the structural collapse of the metal–organic frameworks (MOFs) UiO-66, MIL-140B and MIL-140C upon ball-milling are investigated through solid state 13C NMR and pair distribution function (PDF) studies, finding amorphization to proceed by the breaking of a fraction of metal–ligand bonding in each case. The amorphous products contain inorganic–organic bonding motifs reminiscent of the crystalline phases. Whilst the inorganic Zr6O4(OH)4 clusters of UiO-66 remain intact upon structural collapse, the ZrO backbone of the MIL-140 frameworks undergoes substantial distortion. Density functional theory calculations have been performed to investigate defective models of MIL-140B and show, through comparison of calculated and experimental 13C NMR spectra, that amorphization and defects in the materials are linked. PMID:27144237

  7. The new and computationally efficient MIL-SOM algorithm: potential benefits for visualization and analysis of a large-scale high-dimensional clinically acquired geographic data.

    PubMed

    Oyana, Tonny J; Achenie, Luke E K; Heo, Joon

    2012-01-01

    The objective of this paper is to introduce an efficient algorithm, namely, the mathematically improved learning-self organizing map (MIL-SOM) algorithm, which speeds up the self-organizing map (SOM) training process. In the proposed MIL-SOM algorithm, the weights of Kohonen's SOM are based on the proportional-integral-derivative (PID) controller. Thus, in a typical SOM learning setting, this improvement translates to faster convergence. The basic idea is primarily motivated by the urgent need to develop algorithms with the competence to converge faster and more efficiently than conventional techniques. The MIL-SOM algorithm is tested on four training geographic datasets representing biomedical and disease informatics application domains. Experimental results show that the MIL-SOM algorithm provides a competitive, better updating procedure and performance, good robustness, and it runs faster than Kohonen's SOM. PMID:22481977

  8. Connecting defects and amorphization in UiO-66 and MIL-140 metal-organic frameworks: a combined experimental and computational study

    NASA Astrophysics Data System (ADS)

    Bennett, Thomas D.; Todorova, Tanya K.; Baxter, Emma F.; Reid, David G.; Gervais, Christel; Bueken, Bart; Van de Voorde, B.; De Vos, Dirk; Keen, David A.; Mellot-Draznieks, Caroline

    The mechanism and products of the structural collapse of the metal-organic frameworks (MOFs) UiO-66, MIL-140B and MIL-140C upon ball-milling are investigated through solid state 13C NMR and pair distribution function (PDF) studies, finding amorphization to proceed by the breaking of a fraction of metal-ligand bonding in each case. The amorphous products contain inorganic-organic bonding motifs reminiscent of the crystalline phases. Whilst the inorganic Zr6O4(OH)4 clusters of UiO-66 remain intact upon structural collapse, the ZrO backbone of the MIL-140 frameworks undergoes substantial distortion. Density functional theory calculations have been performed to investigate defective models of MIL-140B and show, through comparison of calculated and experimental 13C NMR spectra, that amorphization and defects in the materials are linked.

  9. The New and Computationally Efficient MIL-SOM Algorithm: Potential Benefits for Visualization and Analysis of a Large-Scale High-Dimensional Clinically Acquired Geographic Data

    PubMed Central

    Oyana, Tonny J.; Achenie, Luke E. K.; Heo, Joon

    2012-01-01

    The objective of this paper is to introduce an efficient algorithm, namely, the mathematically improved learning-self organizing map (MIL-SOM) algorithm, which speeds up the self-organizing map (SOM) training process. In the proposed MIL-SOM algorithm, the weights of Kohonen's SOM are based on the proportional-integral-derivative (PID) controller. Thus, in a typical SOM learning setting, this improvement translates to faster convergence. The basic idea is primarily motivated by the urgent need to develop algorithms with the competence to converge faster and more efficiently than conventional techniques. The MIL-SOM algorithm is tested on four training geographic datasets representing biomedical and disease informatics application domains. Experimental results show that the MIL-SOM algorithm provides a competitive, better updating procedure and performance, good robustness, and it runs faster than Kohonen's SOM. PMID:22481977

  10. Electric-field-induced metastable state of electrical conductivity in polyaniline nanoparticles polymerized in nanopores of a MIL-101 dielectric matrix

    NASA Astrophysics Data System (ADS)

    Romanenko, A. I.; Dybtsev, D. N.; Fedin, V. P.; Aliev, S. B.; Limaev, K. M.

    2015-01-01

    Conducting polyaniline PANI has been obtained inside dielectric nanoporous coordination polymer MIL-101. The application of an electric field transforms both bulk PANI and nanocomposite PANI@MIL to a metastable high-conductive state. After a decrease in the applied electric field, PANI and PANI@MIL relax toward a state low-conductive stable by the law ln[σ( t)/σ(τ)] = -( t/τ) n , which is typical of disordered systems with the characteristic time τ of about six hours for PANI and with three times larger time for composite PANI@MIL. The temperature dependences of the electrical conductivity σ( T) of the samples in both high- and low-ohmic states are described by the fluctuation-induced conductivity model. Significant changes in relaxation processes and in the parameters of the fluctuation-induced tunneling conduction in nanocomposite PANI@MIL are due to a decrease in the sizes of polyaniline particles in the MIL-101 matrix to nanometers.

  11. Temperature-sensitive mutants of MH2 avian leukemia virus that map in the v-mil and the v-myc oncogene respectively.

    PubMed Central

    von Weizscker, F; Beug, H; Graf, T

    1986-01-01

    MH2 is an avian retrovirus that contains the v-mil and v-myc oncogenes. In vitro it transforms chick macrophages that are capable of proliferation in the absence of growth factor. Earlier work showed that v-myc induces macrophage transformation and that v-mil induces the production of chicken myelomonocytic growth factor (cMGF), thus generating an autocrine system. We describe the isolation of temperature-sensitive (ts) mutants of MH2 virus. As suggested by marker rescue experiments, one mutant bears a ts lesion in v-mil, whereas the other carries a mutation in v-myc. Ts v-mil MH2-transformed macrophages become factor-dependent at the non-permissive temperature (42 degrees C), while ts-v-myc MH2-transformed macrophages cease growing and acquire a more normal macrophage phenotype at 42 degrees C irrespective of the presence of cMGF. Both phenotypes can be reversed by backshift to the permissive temperature. These results suggest that the gene products of v-mil and v-myc function independently of each other and that v-mil is necessary for the maintenance of autocrine growth, whereas v-myc is required to maintain the transformed phenotype. Images Fig. 1. Fig. 5. Fig. 7. PMID:3017698

  12. Processing, properties, and ballistic performance of titanium-aluminum titanium metal-intermetallic laminate (MIL) composites

    NASA Astrophysics Data System (ADS)

    Harach, David John

    2000-10-01

    A systematic investigation into the processing of Ti-Al3Ti metal-intermetallic laminate (MIL) composites from elemental titanium and aluminum foils in open air by a novel one step technique, and subsequent characterization, physical, mechanical and ballistic testing was carried out. Al3Ti is the only intermetallic phase to form, and no oxides or other phases are formed. Composites with Ti volume fractions of ˜0, 14, 20, 35, and 57 percent can be processed consistently, with measured density agreeing well with calculated density. The intermetallic reaction occurs in two parts that are linear with respect to Al3Ti growth with time: oxide controlled diffusion of Al, and the order of magnitude faster chemical reaction that occurs after the oxide layer breaks down and transient liquid phases are formed. A reaction model based on the production of Al3Ti spheroids that are ejected from the Ti reaction surface has been developed, and is titled reactive foil sintering. Quasi-static and dynamic compression tests resulted in maximum yield stresses for the 20Ti composite, and end-confined quasi-static and dynamic compression tests, tension tests, and 3-point bend tests resulted in maximum yield stresses and bending loads for the 35Ti composite. Maximum yield stresses occurred in specimens tested with layers parallel to the load. Arrester orientation R-curve testing was completed for the 14Ti composite under large-scale bridging conditions, with initiation toughness values obtained for 20Ti and 35Ti which developed cracks in the intermetallic layer growing perpendicular to the load axis. Divider orientation R-curves were obtained, with the 20Ti and 35Ti curves closely approaching calculated steady-state toughness values. Ballistics testing of bonded Ti, bonded Ti-Al, 5Ti, 14Ti, 35Ti, 57Ti, and Al3Ti at projectile velocities of 500--700 m/s resulted in the 14Ti and 35Ti having the best ballistic performance based on mass efficiency. Ballistics testing of 14Ti, 20Ti, and 35Ti composites at 950 m/s resulted in the 20Ti and 35Ti composites having excellent performance, corresponding to mechanical property trends. There is never debonding of the Ti/Al3Ti interface, and failure modes in quasi-static and dynamic testing are similar, with greater damage in the dynamic testing.

  13. A combined electron microprobe (EMP) and Raman spectroscopic study of the alteration products in Martian meteorite MIL 03346

    NASA Astrophysics Data System (ADS)

    Kuebler, K. E.

    2013-03-01

    We examine the secondary alteration products in MIL 03346 using Raman spectroscopic and electron microprobe traverses. Discussion focuses on the single olivine in ,177 supplemented with observations from ,168 and ,169. Traverses start at the rim and progress into the interior. Dark brown, nearly opaque, laihunite [Fe2+Fe3+2(SiO4)2] is present as overgrowths, and 20-50 µm veins of reddish-brown stilpnomelane [(K,Na,Ca)4(Ti0.1,Al2.3,Fe3+35.5,Mn0.8,Mg9.3) (Si63Al9)(O,OH)206∗n(H2O)] occur inside the olivine. Stilpnomelane crosscuts and postdates the laihunite; veins are in sharp contact with the host olivine but lined by ~5 µm films of jarosite [KFe3+3(SO4)2(OH)6] from a later generation of alteration. An interstitial laihunite also hosts stilpnomelane. The most recent secondary phases are gypsum and bassanite in our X-ray maps of ,168 and ,169. Ca-sulfates were not observed in X-ray maps of ,177 but were detected in our Raman point count. All sulfates are believed to be Martian. The groundmass of MIL indicates rapid cooling from elevated temperatures with fO2 near QFM. Reports of laihunite synthesis by olivine oxidation at elevated temperatures (100-800°C) suggest the overgrowths formed during consolidation. In terrestrial rocks, stilpnomelane is a product of late diagenesis to garnet-grade metamorphism. In MIL, stilpnomelane appears to be a secondary phase formed at the lower end of this stability range, at conditions akin to diagenesis. Raman spectra indicate that the stilpnomelane, jarosite, and Ca-sulfates are hydrated. The stilpnomelane contains Cl- and was followed by jarosite, a product of acid alteration, and the deposition of Ca-sulfates and halide salts from more neutral chloride solutions.

  14. Competitive removal of hazardous dyes from aqueous solution by MIL-68(Al): Derivative spectrophotometric method and response surface methodology approach.

    PubMed

    Tehrani, Mahnaz Saghanejhad; Zare-Dorabei, Rouholah

    2016-05-01

    MIL-68(Al) as a metal-organic framework (MOF) was synthesized and characterized by different techniques such as SEM, BET, FTIR, and XRD analysis. This material was then applied for simulations removal of malachite green (MG) and methylene blue (MB) dyes from aqueous solutions using second order derivative spectrophotometric method (SODS) which was applied to resolve the overlap between the spectra of these dyes. The dependency of dyes removal efficiency in binary solutions was examined and optimized toward various parameters including initial dye concentration, pH of the solution, adsorbent dosage and ultrasonic contact time using central composite design (CCD) under response surface methodology (RSM) approach. The optimized experimental conditions were set as pH7.78, contact time 5min, initial MB concentration 22mgL(-1), initial MG concentration 12mgL(-1) and adsorbent dosage 0.0055g. The equilibrium data was fitted to isotherm models such as Langmuir, Freundlich and Tempkin and the results revealed the suitability of the Langmuir model. The maximum adsorption capacity of 666.67 and 153.85mgg(-1) was obtained for MB and MG removal respectively. Kinetics data fitting to pseudo-first order, pseudo-second order and Elovich models confirmed the applicability of pseudo-second order kinetic model for description of the mechanism and adsorption rate. Dye-loaded MIL-68(Al) can be easily regenerated using methanol and applied for three frequent sorption/desorption cycles with high performance. The impact of ionic strength on removal percentage of both dyes in binary mixture was studied by using NaCl and KCl soluble salts at different concentrations. According to our findings, only small dosage of the proposed MOF is considerably capable to remove large amounts of dyes at room temperature and in very short time that is a big advantage of MIL-68(Al) as a promising adsorbent for adsorptive removal processes. PMID:26890205

  15. Competitive removal of hazardous dyes from aqueous solution by MIL-68(Al): Derivative spectrophotometric method and response surface methodology approach

    NASA Astrophysics Data System (ADS)

    Tehrani, Mahnaz Saghanejhad; Zare-Dorabei, Rouholah

    2016-05-01

    MIL-68(Al) as a metal-organic framework (MOF) was synthesized and characterized by different techniques such as SEM, BET, FTIR, and XRD analysis. This material was then applied for simulations removal of malachite green (MG) and methylene blue (MB) dyes from aqueous solutions using second order derivative spectrophotometric method (SODS) which was applied to resolve the overlap between the spectra of these dyes. The dependency of dyes removal efficiency in binary solutions was examined and optimized toward various parameters including initial dye concentration, pH of the solution, adsorbent dosage and ultrasonic contact time using central composite design (CCD) under response surface methodology (RSM) approach. The optimized experimental conditions were set as pH 7.78, contact time 5 min, initial MB concentration 22 mg L- 1, initial MG concentration 12 mg L- 1 and adsorbent dosage 0.0055 g. The equilibrium data was fitted to isotherm models such as Langmuir, Freundlich and Tempkin and the results revealed the suitability of the Langmuir model. The maximum adsorption capacity of 666.67 and 153.85 mg g- 1 was obtained for MB and MG removal respectively. Kinetics data fitting to pseudo-first order, pseudo-second order and Elovich models confirmed the applicability of pseudo-second order kinetic model for description of the mechanism and adsorption rate. Dye-loaded MIL-68(Al) can be easily regenerated using methanol and applied for three frequent sorption/desorption cycles with high performance. The impact of ionic strength on removal percentage of both dyes in binary mixture was studied by using NaCl and KCl soluble salts at different concentrations. According to our findings, only small dosage of the proposed MOF is considerably capable to remove large amounts of dyes at room temperature and in very short time that is a big advantage of MIL-68(Al) as a promising adsorbent for adsorptive removal processes.

  16. A sensitive and selective sensor for biothiols based on the turn-on fluorescence of the Fe-MIL-88 metal-organic frameworks-hydrogen peroxide system.

    PubMed

    Sun, Zheng Juan; Jiang, Jun Ze; Li, Yuan Fang

    2015-12-21

    Herein, we present a novel strategy based on a "turn-on" fluorescence system made up of metal-organic frameworks Fe-MIL-88 and H2O2 for detecting biothiols in human serum. The nonfluorescent Fe-MIL-88 gives weak fluorescence in the presence of H2O2. Interestingly, it was found that biothiols such as glutathione (GSH), cysteine (Cys) or homocysteine (Hcy) could induce fluorescence turn-on of the Fe-MIL-88/H2O2 system. Under optimal conditions, the relative fluorescence intensity exhibited a good linear relationship in the range from 50 nM-10 μM for GSH (r = 0.994), 50 nM-10 μM for Cys (r = 0.990), and 50 nM-10 μM (r = 0.992) for Hcy; the detection limits of GSH, Cys and Hcy were 30 nM, 40 nM, and 40 nM respectively. Mechanism investigation reveals that biothiols could associate with Fe-MIL-88 via hydrogen bonding and electrostatic interaction followed by redox reaction between biothiols and Fe(3+) present in the Fe-MIL-88, Fe(3+) was thus reduced to Fe(2+), and then Fe(2+) could efficiently catalyze the decomposition of H2O2 to yield ˙OH radicals through the Fenton reaction. Besides, biothiols were able to reduce H2O2 to produce ˙OH radicals directly. Thus the Fe-MIL-88 as well as biothiols could cooperatively contribute to the activation of H2O2 to generate higher amounts of ˙OH radicals, which in turn oxidize the free ligand terephthalic acid (BDC) outside or within the Fe-MIL-88 structure to strongly fluorescent hydroxylated terephthalic acid (OHBDC), thereby turning on the fluorescence. PMID:26568205

  17. Performance of metal-organic framework MIL-101 after surfactant modification in the extraction of endocrine disrupting chemicals from environmental water samples.

    PubMed

    Huang, Zhenzhen; Lee, Hian Kee

    2015-10-01

    The research presented in this paper explored the modification and application of a metal-organic framework, MIL-101, with nonionic surfactant-Triton X-114 in dispersive solid-phase extraction for the preconcentration of four endocrine disrupting chemicals (estrone, 17α-ethynylestradiol, estriol and diethylstilbestrol) from environmental water samples. Triton X-114 molecules could be adsorbed by the hydrophobic surface of the MIL-101 crystals, and thus improved the dispersibility of MIL-101 in aqueous solution by serving as a hydrophilic coating. Cloud point phase separation from Triton X-114 accelerated the separation of extracts from the aqueous matrix. The proposed method combines the favorable attributes of strong adsorption capacity resulting from the porous structure of MIL-101 and self-assembly of Triton X-114 molecules. Post-extraction derivatization using N-methyl-N-(trimethylsilyl)trifluoroacetamide was employed to facilitate the quantitative determination of the extracts by gas chromatography-mass spectrometry. The main factors affecting the preparation of modified MIL-101, and extraction of the analytes, such as the amount of surfactant, the ultrasonic and vortex durations, solution pH and desorption conditions, were investigated in detail. Under the optimized conditions, the present method yielded low limits of detection (0.006-0.023 ng/mL), good linearity from 0.09 to 45 ng/mL (coefficients of determination higher than 0.9980) and acceptable precision (relative standard deviations of 2.2-13%). The surface modified MIL-101 was demonstrated to be effective for the extraction of the selected estrogens from aqueous samples, giving rise to markedly improved extraction performance compared to the unmodified MIL-101. PMID:26078172

  18. Mission-oriented requirements for updating MIL-H-8501. Volume 1: STI proposed structure. [military rotorcraft

    NASA Technical Reports Server (NTRS)

    Clement, W. F.; Hoh, R. H.; Ferguson, S. W., III; Mitchell, D. G.; Ashkenas, I. L.; Mcruer, D. T.

    1985-01-01

    The structure of a new flying and ground handling qualities specification for military rotorcraft is presented. This preliminary specification structure is intended to evolve into a replacement for specification MIL-H-8501A. The new structure is designed to accommodate a variety of rotorcraft types, mission flight phases, flight envelopes, and flight environmental characteristics and to provide criteria for three levels of flying qualities, a systematic treatment of failures and reliability, both conventional and multiaxis controllers, and external vision aids which may also incorporate synthetic display content. Existing and new criteria were incorporated into the new structure wherever they could be substantiated.

  19. Single chip Bus Interface Unit eases MIL-STD-1553B remote terminal/bus controller designs

    NASA Astrophysics Data System (ADS)

    Schaire, S.; Cavin, J.

    A new single-chip 'Smart' Bus Interface Unit (BIU), which is basically a communications processor on a chip, has been developed for use as a remote terminal and a bus controller with MIL-STD-1553B. The BIU design approach allows for future multiplex terminals without the software or BIU becoming obsolete. The use of BIU without a processor and with 8-bit, 16-bit, and other microprocessors is discussed. A sample application with the M68000 microprocessor and the inherent flexibility of the proposed design for future applications are demonstrated.

  20. Selective adsorption of arsenate and the reversible structure transformation of the mesoporous metal-organic framework MIL-100(Fe).

    PubMed

    Cai, Jianhua; Wang, Xueyun; Zhou, Yue; Jiang, Li; Wang, Chunru

    2016-04-20

    Here we describe a highly porous metal-organic framework MIL-100(Fe), which is initially used as an arsenate adsorbent in water. An appropriate mesoporous size allows AsO4(3-) to enter unrestrained and then be captured successfully, furthermore resulting in the damage of long-range order of uniform mesopores. Moreover, the porous framework could also make AsO4(3-) be reversibly desorbed without structural changes and the long-range order of mesopores be recovered again. PMID:27064062

  1. Predicting mixture coadsorption in soft porous crystals: experimental and theoretical Study of CO2/CH4 in MIL-53(Al).

    PubMed

    Ortiz, Aurélie U; Springuel-Huet, Marie-Anne; Coudert, François-Xavier; Fuchs, Alain H; Boutin, Anne

    2012-01-10

    We present a synergistic experimental and theoretical study of CO(2)/CH(4) mixture coadsorption in breathing metal-organic framework MIL-53(Al). Mixture adsorption experiments were performed and their results were analyzed by comparing them to predictions made from pure-component adsorption data using the Osmotic Framework Adsorption Solution Theory (OFAST). This analytical model, fully validated for the first time, was then used to predict coadsorption properties as a function of temperature, pressure, and mixture composition. The phase diagrams obtained show a surprising non-monotonic behavior. PMID:22122795

  2. The adsorbate structure of ferrocene inside [Al(OH)(bdc)]x (MIL-53): a powder X-ray diffraction study.

    PubMed

    Meilikhov, Mikhail; Yusenko, Kirill; Fischer, Roland A

    2009-01-28

    Ferrocene is strongly adsorbed by the highly porous metal-organic framework compound [Al(OH)(bdc)l], (MIL-53; bdc = 1,4-benzenedicarboxylate). The structure of the crystalline phase {[Fe(eta5-C5H5)2][Al(OH)(bdc)]2}x, was determined by X-ray powder diffraction and Rietveld methods. The ferrocene molecules are arranged in a 1D chain-like fashion and their cyclopentadienyl rings are oriented almost parallel to the O3Al faces of the {AlO6}) octahedra without pi-stacking to the bdc. PMID:19378551

  3. Sm-Nd and Rb-Sr Ages for MIL 05035: Implications for Surface and Mantle Sources

    NASA Technical Reports Server (NTRS)

    Nyquist, L. E.; Shih, C-Y.; Reese, Y. D.

    2007-01-01

    The Sm-Nd and Rb-Sr ages and also the initial Nd and Sr isotopic compositions of MIL 05035 are the same as those of A-881757. Comparing the radiometric ages of these meteorites to lunar surface ages as modeled from crater size-frequency distributions as well as the TiO2 abundances and initial Sr-isotopic compositions of other basalts places their likely place of origin as within the Australe or Humboldtianum basins. If so, a fundamental west-east lunar asymmetry in compositional and isotopic parameters that likely is due to the PKT is implied.

  4. Eu(III)-functionalized MIL-124 as fluorescent probe for highly selectively sensing ions and organic small molecules especially for Fe(III) and Fe(II).

    PubMed

    Xu, Xiao-Yu; Yan, Bing

    2015-01-14

    A layerlike MOF (MIL-124, orGa2(OH)4(C9O6H4)) has been prepared and chosen as a parent compound to encapsulate Eu(3+) cations by one uncoordinated carbonyl group in its pores. The Eu(3+)-incorporated sample (Eu(3+)@MIL-124) is fully characterized, which shows excellent luminescence and good fluorescence stability in water or other organic solvents. Subsequently, we choose Eu(3+)@MIL-124 as sensitive probe for sensing metal ions, anions, and organic small molecules because of its robust framework. Studying of the luminescence properties reveals that the complex Eu(3+)@MIL-124 was developed as a highly selective and sensitive probe for detection of Fe(3+) (detection limit, 0.28 μM) and Fe(2+) ions through fluorescence quenching of Eu(3+) and MOF over other metal ions. In connection to this, a probable sensing mechanism was also discussed in this paper. In addition, when Eu(3+)@MIL-124 was immersed in the different anions solutions and organic solvents, it also shows highly selective for Cr2O7(2-)(detection limit, 0.15 μM)and acetone. Remarkably, it is the first Eu-doped MOF to exhibit an excellent ability for the detection of Fe(3+) and Fe(2+) in an aqueous environment without any structural disintegration of the framework. PMID:25510710

  5. Description of a MIL-STD-1553B Data Bus Ada Driver for the LeRC EPS Testbed

    NASA Technical Reports Server (NTRS)

    Mackin, Michael A.

    1995-01-01

    This document describes the software designed to provide communication between control computers in the NASA Lewis Research Center Electrical Power System Testbed using MIL-STD-1553B. The software drivers are coded in the Ada programming language and were developed on a MSDOS-based computer workstation. The Electrical Power System (EPS) Testbed is a reduced-scale prototype space station electrical power system. The power system manages and distributes electrical power from the sources (batteries or photovoltaic arrays) to the end-user loads. The electrical system primary operates at 120 volts DC, and the secondary system operates at 28 volts DC. The devices which direct the flow of electrical power are controlled by a network of six control computers. Data and control messages are passed between the computers using the MIL-STD-1553B network. One of the computers, the Power Management Controller (PMC), controls the primary power distribution and another, the Load Management Controller (LMC), controls the secondary power distribution. Each of these computers communicates with two other computers which act as subsidiary controllers. These subsidiary controllers are, in turn, connected to the devices which directly control the flow of electrical power.

  6. Preparation and characterization of metal-organic framework MIL-101(Cr)-coated solid-phase microextraction fiber.

    PubMed

    Xie, Lijun; Liu, Shuqin; Han, Zhubing; Jiang, Ruifen; Liu, Hong; Zhu, Fang; Zeng, Feng; Su, Chengyong; Ouyang, Gangfeng

    2015-01-01

    Metal-organic frameworks (MOFs) have received great attention as novel sorbents due to their fascinating structures and intriguing potential applications in various fields. In this work, a MIL-101(Cr)-coated solid-phase microextraction (SPME) fiber was fabricated by a simple direct coating method and applied to the determination of volatile compounds (BTEX, benzene, toluene, ethylbenzene, m-xylene and o-xylene) and semi-volatile compounds (PAHs, polycyclic aromatic hydrocarbons) from water samples. The extraction and desorption conditions of headspace SPME (HS-SPME) were optimized. Under the optimized conditions, the established methods exhibited excellent extraction performance. Good precision (<7.7%) and low detection limits (0.32-1.7 ng L(-1) and 0.12-2.1 ng L(-1) for BTEX and PAHs, respectively) were achieved. In addition, the MIL-101(Cr)-coated fiber possessed good thermal stability, and the fiber can be reused over 150 times. The fiber was successfully applied to the analysis of BTEX and PAHs in river water by coupling with gas chromatography-mass spectrometry (GC-MS). The analytes at low concentrations (1.7 and 10 ng L(-1)) were detected, and the recoveries obtained with the spiked river water samples were in the range of 80.0-113% and 84.8-106% for BTEX and PAHs, respectively, which demonstrated the applicability of the self-made fiber. PMID:25467473

  7. Chelating agent-free, vapor-assisted crystallization method to synthesize hierarchical microporous/mesoporous MIL-125 (Ti).

    PubMed

    McNamara, Nicholas D; Hicks, Jason C

    2015-03-11

    Titanium-based microporous heterogeneous catalysts are widely studied but are often limited by the accessibility of reactants to active sites. Metal-organic frameworks (MOFs), such as MIL-125 (Ti), exhibit enhanced surface areas due to their high intrinsic microporosity, but the pore diameters of most microporous MOFs are often too small to allow for the diffusion of larger reactants (>7 Å) relevant to petroleum and biomass upgrading. In this work, hierarchical microporous MIL-125 exhibiting significantly enhanced interparticle mesoporosity was synthesized using a chelating-free, vapor-assisted crystallization method. The resulting hierarchical MOF was examined as an active catalyst for the oxidation of dibenzothiophene (DBT) with tert-butyl hydroperoxide and outperformed the solely microporous analogue. This was attributed to greater access of the substrate to surface active sites, as the pores in the microporous analogues were of inadequate size to accommodate DBT. Moreover, thiophene adsorption studies suggested the mesoporous MOF contained larger amounts of unsaturated metal sites that could enhance the observed catalytic activity. PMID:25695286

  8. Meteorite Dunite Breccia MIL 03443: A Probable Crustal Cumulate Closely Related to Diogenites from the HED Parent Asteroid

    NASA Technical Reports Server (NTRS)

    Mittlefehldt, David W.

    2008-01-01

    There are numerous types of differentiated meteorites, but most represent either the crusts or cores of their parent asteroids. Ureilites, olivine-pyroxene-graphite rocks, are exceptions; they are mantle restites [1]. Dunite is expected to be a common mantle lithology in differentiated asteroids. In particular, models of the eucrite parent asteroid contain large volumes of dunite mantle [2-4]. Yet dunites are very rare among meteorites, and none are known associated with the howardite, eucrite, diogenite (HED) suite. Spectroscopic measurements of 4 Vesta, the probable HED parent asteroid, show one region with an olivine signature [5] although the surface is dominated by basaltic and orthopyroxenitic material equated with eucrites and diogenites [6]. One might expect that a small number of dunitic or olivine-rich meteorites might be delivered along with the HED suite. The 46 gram meteoritic dunite MIL 03443 (Fig. 1) was recovered from the Miller Range ice field of Antarctica. This meteorite was tentatively classified as a mesosiderite because large, dunitic clasts are found in this type of meteorite, but it was noted that MIL 03443 could represent a dunite sample of the HED suite [7]. Here I will present a preliminary petrologic study of two thin sections of this meteorite.

  9. Turning Redundant Ligands into Treasure: A New Strategy for Constructing MIL-53(Al)@Nanoscale TiO2 Layers.

    PubMed

    Gu, Yifan; Wu, Yi-Nan; Shen, Jingyi; Li, Zehua; Chen, Shuyi; Lu, Huigong; Li, Fengting

    2015-11-23

    A strategy for in situ fabrication of nanoscale-thin layers of anatase TiO2 coated on the metal-organic framework (MOF) material, MIL-53(Al), is developed. The preparation conditions for crystallized TiO2 are normally incompatible with the thermal and chemical stability of MOFs. Based on our strategy, we found that the redundant organic ligands (1,4-benzenedicarboxylic acid, H2 BDC) within the pores of the as-synthesized MOF play a key function in the protection and support of the framework during hydrothermal loading of the TiO2 precursor, as well as in preventing the infiltration of the precursor into the pores. After annealing, a nanoscale-thin layer of highly crystalline anatase TiO2 , with a thickness of 6-10 nm, was successfully attached to the external surface of the MIL-53(Al) crystals, while the porous framework remains intact. The core-shell structure of the MOF@TiO2 nanocomposite endows the resulting materials with additional optical response and enhanced moisture and chemical stability. PMID:26463359

  10. Size- and morphology-controlled NH2-MIL-53(Al) prepared in DMF-water mixed solvents.

    PubMed

    Cheng, Xinquan; Zhang, Anfeng; Hou, Keke; Liu, Min; Wang, Yingxia; Song, Chunshan; Zhang, Guoliang; Guo, Xinwen

    2013-10-01

    We present here a simple solvothermal method to fabricate metal-organic framework NH2-MIL-53(Al) crystals with controllable size and morphology just by altering the ratio of water in the DMF-water mixed solvent system without the addition of any surfactants or capping agents. With increasing the volume ratio of water in the mixed solvents, a series of NH2-MIL-53(Al) crystals with different sizes and morphologies were synthesized. The average size of the smallest crystal is 76 ± 20 nm, which provides us a simple and environmentally friendly way to prepare nanoscale MOFs. The largest BET surface area of these samples is 1882 m(2) g(-1) that is mainly contributed by its micropore surface area, and its corresponding micropore volume is 0.83 cm(3) g(-1), which have greatly extended its application in the fields of gas adsorption and postsynthetic modification. All these samples were characterized by SEM, XRD, N2 adsorption/desorption, TGA and FT-IR. Then a mechanism for the impact of the water ratio on the crystal size and morphology is presented and discussed. PMID:23903703

  11. Dye-sensitized MIL-101 metal organic frameworks loaded with Ni/NiO{sub x} nanoparticles for efficient visible-light-driven hydrogen generation

    SciTech Connect

    Liu, Xin-Ling; Wang, Rong; Yuan, Yu-Peng E-mail: cxue@ntu.edu.sg; Zhang, Ming-Yi; Xue, Can E-mail: cxue@ntu.edu.sg

    2015-10-01

    The Ni/NiO{sub x} particles were in situ photodeposited on MIL-101 metal organic frameworks as catalysts for boosting H{sub 2} generation from Erythrosin B dye sensitization under visible-light irradiation. The highest H{sub 2} production rate of 125 μmol h{sup −1} was achieved from the system containing 5 wt. % Ni-loaded MIL-101 (20 mg) and 30 mg Erythrosin B dye. Moreover, the Ni/NiO{sub x} catalysts show excellent stability for long-term photocatalytic reaction. The enhancement on H{sub 2} generation is attributed to the efficient charge transfer from photoexcited dye to the Ni catalyst via MIL-101. Our results demonstrate that the economical Ni/NiO{sub x} particles are durable and active catalysts for photocatalytic H{sub 2} generation.

  12. Dye-sensitized MIL-101 metal organic frameworks loaded with Ni/NiOx nanoparticles for efficient visible-light-driven hydrogen generation

    NASA Astrophysics Data System (ADS)

    Liu, Xin-Ling; Wang, Rong; Zhang, Ming-Yi; Yuan, Yu-Peng; Xue, Can

    2015-10-01

    The Ni/NiOx particles were in situ photodeposited on MIL-101 metal organic frameworks as catalysts for boosting H2 generation from Erythrosin B dye sensitization under visible-light irradiation. The highest H2 production rate of 125 μmol h-1 was achieved from the system containing 5 wt. % Ni-loaded MIL-101 (20 mg) and 30 mg Erythrosin B dye. Moreover, the Ni/NiOx catalysts show excellent stability for long-term photocatalytic reaction. The enhancement on H2 generation is attributed to the efficient charge transfer from photoexcited dye to the Ni catalyst via MIL-101. Our results demonstrate that the economical Ni/NiOx particles are durable and active catalysts for photocatalytic H2 generation.

  13. High performance liquid chromatography of substituted aromatics with the metal-organic framework MIL-100(Fe): Mechanism analysis and model-based prediction.

    PubMed

    Qin, Weiwei; Silvestre, Martin Eduardo; Li, Yongli; Franzreb, Matthias

    2016-02-01

    Metal-organic framework (MOF) MIL-100(Fe) 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(Fe) 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 modeling using a recently developed chromatographic software (ChromX), adsorption equilibrium parameters, including the affinities and maximum capacities, for each analyte toward the MIL-100(Fe) are obtained. In addition, the pore diffusivity of aromatic hydrocarbons within MIL-100(Fe) was determined to be 5×10(-12)m(2)s(-1). While the affinities of MIL-100(Fe) 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(Fe) unit cell, respectively. PMID:26787165

  14. Brønsted instead of Lewis acidity in functionalized MIL-101Cr MOFs for efficient heterogeneous (nano-MOF) catalysis in the condensation reaction of aldehydes with alcohols.

    PubMed

    Herbst, Annika; Khutia, Anupam; Janiak, Christoph

    2014-07-21

    Porous chromium(III) 2-nitro-, 2-amino-, and nonfunctionalized terephthalate (MIL-101Cr) metal organic frameworks are heterogeneous catalysts for diacetal formation from benzaldehyde and methanol (B-M reaction) as well as other aldehydes and alcohols. MIL-101Cr-NO2 obtained by direct reaction between CrO3 and 2-nitro-terephthalate showed the highest activity with 99% conversion in the B-M reaction in 90 min and turnover numbers of 114. The activity decreased in the order MIL-101Cr-NO2 > MIL-101Cr > MIL-101Cr-NH2. Within different samples of nonfunctionalized MIL-101Cr the activity increased with surface area. Methanol gas sorption of the different MIL materials correlates with the BET surface area and pore volume but not with the diacetalization activity. Benzaldehyde adsorption from heptane showed no significant difference for the different MILs. Gas sorption studies of CD3CN to probe for a higher Lewis acidity in MIL-101Cr-NO2 remained inconclusive. A high B-M catalytic activity of wet MIL-101Cr-NO2 excluded significant contributions from coordinatively unsaturated Lewis-acid sites. pH measurements of methanol dispersions of the MIL materials gave the most acidic pH (as low as 1.9) for MIL-101Cr-NO2, which significantly increased over MIL-101Cr (3.0) to MIL-101Cr-NH2 (3.3). The increase in acidity is of short range or a surface effect to the heterogeneous MIL particles as protons dissociating from the polarized aqua ligands (Cr-OH2) have to stay near the insoluble counteranionic framework. The variation in Brønsted acidity of MIL-101Cr-NO2 > MIL-101Cr ≈ MIL-101Cr-NH2 correlates with the withdrawing effect of NO2 and the diacetalization activity. The catalytic B-M activity of soluble, substitution-inert, and acidic Cr(NO3)3·9H2O supports the Brønsted-acid effect of the MIL materials. Filtration and centrifugation experiments with MIL-101Cr-NO2 revealed that about 2/3 of the catalytic activity comes from nano-MOF particles with a diameter below 200 nm. The MIL-101Cr-NO2 catalysts can be recycled five times with very little loss in activity. The diacetalization activity of MIL-101Cr-NO2 decreases with the alcohol chain length from methanol over ethanol, n-propanol, n-butanol, to almost inactive n-pentanol, while conversions for benzaldehyde, paratolylaldehyde, 4-chlorobenzaldehyde, and cyclohexanone all reach 90% or more after 90 min. PMID:25006999

  15. Isomorphous substitution in a flexible metal-organic framework: mixed-metal, mixed-valent MIL-53 type materials.

    PubMed

    Breeze, Matthew I; Clet, Guillaume; Campo, Betiana C; Vimont, Alexandre; Daturi, Marco; Grenèche, Jean-Marc; Dent, Andrew J; Millange, Franck; Walton, Richard I

    2013-07-15

    Mixed-metal iron-vanadium analogues of the 1,4-benzenedicarboxylate (BDC) metal-organic framework MIL-53 have been synthesized solvothermally in N,N'-dimethylformamide (DMF) from metal chlorides using initial Fe:V ratios of 2:1 and 1:1. At 200 °C and short reaction time (1 h), materials (Fe,V)(II/III)BDC(DMF(1-x)F(x)) crystallize directly, whereas the use of longer reaction times (3 days) at 170 °C yields phases of composition [(Fe,V)(III)0.5(Fe,V)0.5(II)(BDC)(OH,F)](0.5-)·0.5DMA(+) (DMA = dimethylammonium). The identity of the materials is confirmed using high-resolution powder X-ray diffraction, with refined unit cell parameters compared to known pure iron analogues of the same phases. The oxidation states of iron and vanadium in all samples are verified using X-ray absorption near edge structure (XANES) spectroscopy at the metal K-edges. This shows that in the two sets of materials each of the vanadium and the iron centers are present in both +2 and +3 oxidation states. The local environment and oxidation state of iron is confirmed by (57)Fe Mössbauer spectrometry. Infrared and Raman spectroscopies as a function of temperature allowed the conditions for removal of extra-framework species to be identified, and the evolution of μ2-hydroxyls to be monitored. Thus calcination of the mixed-valent, mixed-metal phases [(Fe,V)(III)0.5(Fe,V)0.5(II)(BDC)(OH,F)](0.5-)·0.5DMA(+) yields single-phase MIL-53-type materials, (Fe,V)(III)(BDC)(OH,F). The iron-rich, mixed-metal MIL-53 shows structural flexibility that is distinct from either the pure Fe material or the pure V material, with a thermally induced pore opening upon heating that is reversible upon cooling. In contrast, the material with a Fe:V content of 1:1 shows an irreversible expansion upon heating, akin to the pure vanadium analogue, suggesting the presence of some domains of vanadium-rich regions that can be permanently oxidized to V(IV). PMID:23815225

  16. MIL-53 frameworks in mixed-matrix membranes and cross-linked ZIF-8/matrimidRTM mixed-matrix membranes for gas separation

    NASA Astrophysics Data System (ADS)

    Hsieh, Josephine Ordonez

    Mixed matrix membranes (MMMs) are hybrid materials consisting of two phases: an inorganic nanoscale particle as the discrete phase, and a polymeric material as the continuous phase. The incorporation of inorganic particles into a polymer can improve a membrane's overall separation performance. MMMs incorporating metal-organic frameworks (MOFs) have exhibited promising gas separation performance. MOFs are inorganic-organic crystals constructed from metal ions that are linked by polydentate ligands. Zeolitic imidazolate frameworks (ZIFs) are a sub-class of MOFs that uses imidazole analogues as ligands. In these studies, the MOF MIL-53 and ZIF-8 were successfully synthesized and characterized by a battery of analytical techniques including XRD, FTIR, TGA, N2 adsorption, and SEM, and were incorporated into MMMs with Matrimid® polymer. In chapter 1, MIL-53/Matrimid® MMMs containing MIL-53-ht (open-pore form) were fabricated, characterized and obtained permeability values higher than Matrimid®. Selectivities decreased for the gas pairs of O2/N2, H2/O2, H2/CO2, and H2/N2. However, slight enhancement of the CO2/CH4 selectivity was observed for the MIL-53-ht/Matrimid® compared to that of Matrimid ®. The MIL-53-as/Matrimid® MMM also showed an increase in permeability as well as an increase in selectivity for the gas pairs H2/O2, CO2/CH4, H 2/CH4, and H2/N2. The MIL-53-lt/Matrimid ® MMM showed that it does not retain its closed-pore form in the MMM due to chloroform solvent opening the pores and eventually polymer confinement of the MIL 53 framework in the MMM. In chapter 2, easy synthesis and fabrication of the MIL-53 MOF membrane was realized using a seeded growth method with a commercially available alumina TLC plate. The MOF membrane had a well-intergrown and dense layer of MIL-53 crystals on the surface of the alumina substrate. The MIL-53 crystals were also converted to the MIL-53-lt (closed-pore form) after heating at 330 °C and cooling to room temperature, which confirms the breathing ability of the MOF. In chapter 3, a comprehensive approach for membrane materials in order to achieve high productivity and separation efficiency was applied by incorporating additives into polymers and cross-linking the resulting MMM that could lead to increase and simultaneous selectivity enhancement. ZIF-8 was used as an additive in these MMMs. ZIF-8 can readily absorb small gases such, as H 2 and CO2 due to its 3.4 Å pore aperture. ZIF-8/Matrimid ® MMMs were fabricated with a spin-coated Matrimid® layer on one surface and cross-linked with EDA vapor. This membrane morphology could lead to enhanced selectivities due to the cross-linked layer, at the same time maintain the high permeability of the bulk MMM. The permeabilities decreased for the cross-linked, spin-coated Matrimid® ZIF-8/Matrimid ® MMMs. However, there was enhancement in selectivities for H 2/CO2, H2/N2, H2/O 2 and H2/CH4 gas pairs, which can be due to reduction of diffusive pathways for larger gas molecules. Compared to uncross-linked ZIF-8/Matrimid® MMMs, the cross-linked, spin-coated Matrimid ® ZIF-8/Matrimid® MMMs lie close to the Robeson's upper bound for H2/CO2 suggesting its potential for this gas pair separation.

  17. Radiative cooling test facility and performance evaluation of 4-MIL aluminized polyvinyl fluoride and white-paint surfaces

    SciTech Connect

    Kruskopf, M.S.; Berdahl, P.; Martin, M.; Sakkal, F.; Sobolewski, M.

    1980-11-01

    A test facility designed to measure the amount of radiative cooling a specific material or assembly of materials will produce when exposed to the sky is described. Emphasis is placed upon assemblies which are specifically designed to produce radiative cooling and which therefore offer promise for the reduction of temperatures and/or humidities in occupied spaces. The hardware and software used to operate the facility are documented and the results of the first comprehensive experiments are presented. A microcomputer-based control/data acquisition system was employed to study the performance of two prototype radiator surfaces: 4-mil aluminized polyvinyl fluoride (PVF) and white painted surfaces set below polyethylene windscreens. The cooling rates for materials tested were determined and can be approximated by an equation (given). A computer model developed to simulate the cooling process is presented. (MCW)

  18. Direct carbonization of cobalt-doped NH2-MIL-53(Fe) for electrocatalysis of oxygen evolution reaction

    NASA Astrophysics Data System (ADS)

    Han, Yujie; Zhai, Junfeng; Zhang, Lingling; Dong, Shaojun

    2015-12-01

    In this work, we synthesized high-performance electrocatalysts for oxygen evolution reaction (OER) by one-step carbonization of cobalt(Co)-doped NH2-MIL-53(Fe) with different molar ratios between Fe and Co. The results showed that the as-prepared composite with a molar ratio between Fe and Co = 1 : 3 and the calcination temperature of 550 °C displayed the best OER activity, denoted as MOF(Fe1-Co3)550N. The MOF(Fe1-Co3)550N possesses a microporous structure with a high Brunauer-Emmett-Teller (BET) surface area of 235.37 m2.g-1. It shows excellent OER catalytic behavior in 0.1 M KOH solution. The overpotential at 10 mA cm-2 is 0.39 V and the Tafel slope is 72.9 mV dec-1, which is comparable to that of the as-synthesized RuO2. The satisfactory results are attributed to the presence of pyridine N, Co3O4, the enlarged surface area and the micropore structures after calcination.In this work, we synthesized high-performance electrocatalysts for oxygen evolution reaction (OER) by one-step carbonization of cobalt(Co)-doped NH2-MIL-53(Fe) with different molar ratios between Fe and Co. The results showed that the as-prepared composite with a molar ratio between Fe and Co = 1 : 3 and the calcination temperature of 550 °C displayed the best OER activity, denoted as MOF(Fe1-Co3)550N. The MOF(Fe1-Co3)550N possesses a microporous structure with a high Brunauer-Emmett-Teller (BET) surface area of 235.37 m2.g-1. It shows excellent OER catalytic behavior in 0.1 M KOH solution. The overpotential at 10 mA cm-2 is 0.39 V and the Tafel slope is 72.9 mV dec-1, which is comparable to that of the as-synthesized RuO2. The satisfactory results are attributed to the presence of pyridine N, Co3O4, the enlarged surface area and the micropore structures after calcination. Electronic supplementary information (ESI) available: Additional information about the TEM images of different catalysts, XRD comparison of NH2-MIL-53(Fe) and other cobalt doped NH2-MIL-53(Fe), BET measurements of MOF(Fe1-Co3) and MOF(Fe1-Co3)550N and the TEM and XPS characterization of as-synthesized RuO2. See DOI: 10.1039/c5nr06626c

  19. Radiative cooling test facility and performance evaluation of 4-Mil aluminized polyvinyl fluoride and white paint surfaces

    NASA Astrophysics Data System (ADS)

    Kruskopt, M. S.; Berdahl, P.; Martin, M.; Sakkal, F.; Sobolewski, M.

    1980-11-01

    A test facility designed to measure the amount of radiative cooling a specific material or assembly of materials will produce when exposed to the sky is described. Emphasis is placed upon assemblies which are specifically designed to produce radiative cooling and which therefore offer promise for the reduction of temperatures and/or humidities in occupied spaces. The hardware and software used to operate the facility are documented and the results of the first comprehensive experiments are presented. A microcomputer based control/data acquisition system was employed to study the performance of two prototype radiator surfaces: 4-mil aluminized polyvinyl fluoride (PVF) and white painted surfaces set below polyethylene windscreens. The cooling rates for materials tested were determined and can be approximated by an equation (given). A computer model developed to simulate the cooling process is presented.

  20. Separation of CO2-CH4 mixtures in the mesoporous MIL-100(Cr) MOF: experimental and modelling approaches.

    PubMed

    Hamon, Lomig; Heymans, Nicolas; Llewellyn, Philip L; Guillerm, Vincent; Ghoufi, Aziz; Vaesen, Sébastien; Maurin, Guillaume; Serre, Christian; De Weireld, Guy; Pirngruber, Gerhard D

    2012-04-14

    Carbon dioxide is the main undesirable compound present in raw natural gas and biogas. Physisorption based adsorption processes such as pressure swing adsorption (PSA) are one of the solutions to selectively adsorb CO(2) from CH(4). Some hybrid crystalline porous materials that belong to the family of metal-organic frameworks (MOFs) show larger CO(2) adsorption capacity compared to the usual industrial adsorbents, such as zeolites and most activated carbons, which makes them potentially promising for such applications. However, their selectivity values have been most often determined using only single gas adsorption measurements combined with simple macroscopic thermodynamic models or by means of molecular simulations based on generic forcefields. The transfer of this systematic approach to all MOFs, whatever their complex physico-chemical features, needs to be considered with caution. In contrast, direct co-adsorption measurements collected on these new materials are still scarce. The aim of this study is to perform a complete analysis of the CO(2)-CH(4) co-adsorption in the mesoporous MIL-100(Cr) MOF (MIL stands for Materials from Institut Lavoisier) by means of a synergic combination of outstanding experimental and modelling tools. This solid has been chosen both for its fundamental interests, given its very large CO(2) adsorption capacities and its complexity with a combination of micropores and mesopores and the existence of unsaturated accessible metal sites. The predictions obtained by means of Grand Canonical Monte Carlo simulations based on generic forcefields as well as macroscopic thermodynamic (IAST, RAST) models will be compared to direct the co-adsorption experimental data (breakthrough curve and volumetric measurements). PMID:22358076

  1. Ballistic-Failure Mechanisms in Gas Metal Arc Welds of Mil A46100 Armor-Grade Steel: A Computational Investigation

    NASA Astrophysics Data System (ADS)

    Grujicic, M.; Snipes, J. S.; Galgalikar, R.; Ramaswami, S.; Yavari, R.; Yen, C.-F.; Cheeseman, B. A.

    2014-09-01

    In our recent work, a multi-physics computational model for the conventional gas metal arc welding (GMAW) joining process was introduced. The model is of a modular type and comprises five modules, each designed to handle a specific aspect of the GMAW process, i.e.: (i) electro-dynamics of the welding-gun; (ii) radiation-/convection-controlled heat transfer from the electric-arc to the workpiece and mass transfer from the filler-metal consumable electrode to the weld; (iii) prediction of the temporal evolution and the spatial distribution of thermal and mechanical fields within the weld region during the GMAW joining process; (iv) the resulting temporal evolution and spatial distribution of the material microstructure throughout the weld region; and (v) spatial distribution of the as-welded material mechanical properties. In the present work, the GMAW process model has been upgraded with respect to its predictive capabilities regarding the spatial distribution of the mechanical properties controlling the ballistic-limit (i.e., penetration-resistance) of the weld. The model is upgraded through the introduction of the sixth module in the present work in recognition of the fact that in thick steel GMAW weldments, the overall ballistic performance of the armor may become controlled by the (often inferior) ballistic limits of its weld (fusion and heat-affected) zones. To demonstrate the utility of the upgraded GMAW process model, it is next applied to the case of butt-welding of a prototypical high-hardness armor-grade martensitic steel, MIL A46100. The model predictions concerning the spatial distribution of the material microstructure and ballistic-limit-controlling mechanical properties within the MIL A46100 butt-weld are found to be consistent with prior observations and general expectations.

  2. Comparison of MIL-STD-1773 fiber optic data bus terminals: Single event proton test irradiation, in-flight space performance, and prediction techniques

    SciTech Connect

    LaBel, K.A.; Barth, J.; Leidecker, H.; Reed, R.; Marshall, P.W.; Marshall, C.J.; Seidleck, C.M.

    1998-06-01

    The authors present a comparison of proton single event ground test results for two generations of MIL-STD-1773 fiber optic data bus interface modules. Single event upset rate prediction techniques for fiber optic data systems are also demonstrated and compared with in-flight space performance.

  3. Probing the Structural Stability of and Enhanced CO2 Storage in MOF MIL-68(In) under High Pressures by FTIR Spectroscopy.

    PubMed

    Hu, Yue; Lin, Bin; He, Peng; Li, Youyong; Huang, Yining; Song, Yang

    2015-12-14

    The unique structural topology of metal-organic framework (MOF) MIL-68, featuring two types of channels with distinct pore sizes, makes it a promising candidate for application in gas storage and separation. In this study, the behavior of as-made and activated MIL-68(In) was investigated in a diamond-anvil cell under high pressure by in situ IR spectroscopy. The framework exhibits high stability under compression up to 9 GPa, whereas the bridging OH groups appear to be very sensitive to compression. Pressure-induced structural modifications were found to be completely reversible for as-made MIL-68(In) but irreversible for the activated framework. Moreover, the addition of Nujol as pressure-transmitting medium makes the framework more resilient to pressure. Finally, when loaded with CO2, the framework exhibited interesting differential binding affinities with CO2 in the hexagonal and triangular pores at different pressures. The pressure-enhanced CO2 storage behavior and the guest-host interaction mechanism between CO2 and the MOF framework were explored with the aid of Monte Carlo simulations. These studies demonstrated great potential for MIL-68(In) in gas-storage applications that require extreme loading pressures. PMID:26538464

  4. Enhanced catalytic activity over MIL-100(Fe) loaded ceria catalysts for the selective catalytic reduction of NOx with NH₃ at low temperature.

    PubMed

    Wang, Peng; Sun, Hong; Quan, Xie; Chen, Shuo

    2016-01-15

    The development of catalysts for selective catalytic reduction (SCR) reactions that are highly active at low temperatures and show good resistance to SO2 and H2O is still a challenge. In this study, we have designed and developed a high-performance SCR catalyst based on nano-sized ceria encapsulated inside the pores of MIL-100(Fe) that combines excellent catalytic power with a metal organic framework architecture synthesized by the impregnation method (IM). Transmission electron microscopy (TEM) revealed the encapsulation of ceria in the cavities of MIL-100(Fe). The prepared IM-CeO2/MIL-100(Fe) catalyst shows improved catalytic activity both at low temperatures and throughout a wide temperature window. The temperature window for 90% NOx conversion ranges from 196 to 300°C. X-ray photoelectron spectroscopy (XPS) and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFT) analysis indicated that the nano-sized ceria encapsulated inside MIL-100(Fe) promotes the production of chemisorbed oxygen on the catalyst surface, which greatly enhances the formation of the NO2 species responsible for fast SCR reactions. PMID:26414927

  5. Preparation of MIL-53(Fe)-Reduced Graphene Oxide Nanocomposites by a Simple Self-Assembly Strategy for Increasing Interfacial Contact: Efficient Visible-Light Photocatalysts.

    PubMed

    Liang, Ruowen; Shen, Lijuan; Jing, Fenfen; Qin, Na; Wu, Ling

    2015-05-13

    In this work, MIL-53(Fe)-reduced graphene oxide (M53-RGO) nanocomposites have been successfully fabricated by a facile and efficient electrostatic self-assembly strategy for improving the interfacial contact between RGO and the MIL-53(Fe). Compared with D-M53-RGO (direct synthesis of MIL-53(Fe)-reduced graphene oxide nanocomposites via one-pot solvothermal approach), M53-RGO nanocomposites exhibit improved photocatalytic activity compared with the D-M53-RGO under identical experimental conditions. After 80 min of visible light illumination (λ ≥ 420 nm), the reduction ratio of Cr(VI) is rapidly increased to 100%, which is also higher than that of reference sample (N-doped TiO2). More significantly, the M53-RGO nanocomposites are proven to perform as bifunctional photocatalysts with considerable activity in the mixed systems (Cr(VI)/dyes) under visible light, which made it a potential candidate for industrial wastewater treatment. Combining with photoelectrochemical analyses, it could be revealed that the introduction of RGO would minimize the recombination of photogenerated electron-hole pairs. Additionally, the effective interfacial contact between MIL-53(Fe) and RGO surface would further accelerate the transfer of photogenerated electrons, leading to the enhancement of photocatalytic activity of M53-RGO toward photocatalytic reactions. Finally, a possible photocatalytic reaction mechanism is also investigated in detail. PMID:25894300

  6. MIL-53(Fe) as a highly efficient bifunctional photocatalyst for the simultaneous reduction of Cr(VI) and oxidation of dyes.

    PubMed

    Liang, Ruowen; Jing, Fenfen; Shen, Lijuan; Qin, Na; Wu, Ling

    2015-04-28

    A bifunctional photocatalyst-Fe-benzenedicarboxylate (MIL-53(Fe)) has been synthesized successfully via a facile solvothermal method. The resulting MIL-53(Fe) photocatalyst exhibited an excellent visible light (λ≥ 420nm) photocatalytic activity for the reduction of Cr(VI), the reduction rate have reached about 100% after 40min of visible light irradiation, which has been more efficient than that of N-doped TiO2 (85%) under identical experimental conditions. Further experimental results have revealed that the photocatalytic activity of MIL-53(Fe) for the reduction of Cr(VI) can be drastically affected by the pH value of the reaction solution, the hole scavenger and atmosphere. Moreover, MIL-53(Fe) has exhibited considerable photocatalytic activity in the mixed systems (Cr(VI)/dyes). After 6h of visible light illumination, the reduction ratio of Cr(VI) and the degradation ratio of dyes have been exceed 60% and 80%, respectively. More significantly, the synergistic effect can also be found during the process of photocatalytic treatment of Cr(VI) contained wastewater under the same photocatalytic reaction conditions, which makes it a potential candidate for environmental restoration. Finally, a possible reaction mechanism has also been investigated in detail. PMID:25677473

  7. New functionalized flexible Al-MIL-53-X (X = -Cl, -Br, -CH3, -NO2, -(OH)2) solids: syntheses, characterization, sorption, and breathing behavior.

    PubMed

    Biswas, Shyam; Ahnfeldt, Tim; Stock, Norbert

    2011-10-01

    Five new flexible functionalized aluminum hydroxo terephthalates [Al(OH)(BDC-X)]·n(guests) (BDC = 1,4-benzene-dicarboxylate; X = -Cl, 1-Cl; -Br, 2-Br; -CH(3), 3-CH(3); -NO(2), 4-NO(2); -(OH)(2), 5-OH(2)) were synthesized under solvothermal conditions. The as synthesized (Al-MIL-53-X-AS) as well as the activated compounds were characterized by X-ray powder diffraction (XRPD), IR spectroscopy, thermogravimetric (TG), and elemental analysis. Activation, that is, removal of unreacted H(2)BDC-X molecules and/or occluded solvent molecules, followed by hydration in air at room temperature, led to the narrow pore (NP) form of the title compounds [Al(OH)(BDC-X)]·n(H(2)O) (Al-MIL-53-X). Thermogravimetric analysis (TGA) and temperature-dependent XRPD (TDXRPD) experiments performed on the NP-form of the compounds indicate high thermal stability in the range 325-500 °C. As verified by N(2), CO(2), or H(2)O sorption measurements, most of the thermally activated compounds exhibit significant microporosity. Similar to pristine Al-MIL-53, the present compounds retain their structural flexibility depending on the nature of guest molecules and temperature, as verified by cell parameter determination from XRPD data. The breathing behavior of the functionalized frameworks upon dehydration-rehydration, investigated by temperature and time-dependent XRPD measurements, differs significantly compared to parent Al-MIL-53. PMID:21899293

  8. Metal-organic framework MIL-100(Fe) as the stationary phase for both normal-phase and reverse-phase high performance liquid chromatography.

    PubMed

    Fu, Yan-Yan; Yang, Cheng-Xiong; Yan, Xiu-Ping

    2013-01-25

    Metal-organic framework MIL-100(Fe) was explored as a novel stationary phase for both normal-phase and reverse-phase high performance liquid chromatography. Two groups of analytes (benzene, toluene, ethylbenzene, naphthalene and 1-chloronaphthalene; aniline, acetanilide, 2-nitroaniline and 1-naphthylamine) were used to test the separation performance of MIL-100(Fe) in the reverse-phase mode, while the isomers of chloroaniline or toluidine were employed to evaluate its performance in the normal-phase mode. The MIL-100(Fe) packed column gave a baseline separation of all the tested analytes with good precision. The separation was controlled by negative enthalpy change and entropy change in the reverse-phase mode, but positive enthalpy change and entropy change in the normal-phase mode. The relative standard deviations of retention time, peak area, peak height, and half peak width for eleven replicate separations of the tested analytes were 0.2-0.7%, 0.5-3.6%, 0.6-2.3% and 0.8-1.7%, respectively. The mesoporous cages, accessible windows, excellent chemical and solvent stability, metal active sites and aromatic pore walls make MIL-100(Fe) a good candidate as a novel stationary phase for both normal-phase and reverse-phase high performance liquid chromatography. PMID:23290359

  9. Controlled stepwise-synthesis of core-shell Au@MIL-100 (Fe) nanoparticles for sensitive surface-enhanced Raman scattering detection.

    PubMed

    Liao, Jia; Wang, Dongmei; Liu, Anqi; Hu, Yuling; Li, Gongke

    2015-12-21

    A novel porous Au@MIL-100 (Fe) core-shell structure in which a Au nanoparticle (AuNP) core is coated with a controllable uniform metal-organic framework shell has been fabricated by using a facile step-by-step procedure. The as-synthesized Au@MIL-100 (Fe) takes advantage of the high adsorption capability of the MIL-100 (Fe) shell and the localized surface plasmon resonance properties of the AuNP core, and was used as a hybrid surface enhanced Raman scattering (SERS) substrate. We discussed the fabrication, physical characterization, and SERS activity of our novel substrate, and found that this new substrate had controllable shell thickness, high stability and good SERS activity. The potential practical application of the novel SERS substrate was firstly evaluated by quantitative analysis of malachite green in aquaculture water. The method showed good linearity between 3.0 × 10(-8)-1.0 × 10(-6) mol L(-1) for malachite green with a correlation coefficient of 0.9945. The limit of detection (LOD) was 8.0 × 10(-9) mol L(-1). Then the applicability of Au@MIL-100 (Fe) as the SERS substrate for in situ detection of malachite green on the fish body indicated its great potential as a rapid and on-site detection analytical strategy. In addition, the preliminary investigation also shows that the Au@MIL-100 (Fe) has SERS activity toward carbon disulfide which would be a new strategy for SERS-based gas sensors. PMID:26568098

  10. The Onset and Duration of Action of 0.2% Lidocaine in a One-per-Mil Tumescent Solution for Hand Surgery

    PubMed Central

    Prasetyono, Theddeus O.H.

    2016-01-01

    Background One-per-mil tumescent solution, which contains 0.2% lidocaine with 1:1,000,000 epinephrine, has been reported to be clinically effective for hand surgery under local anesthesia. However, it was lacking in its basic pharmacokinetics profile in regard to the onset of action (OOA) and duration of action (DOA). Methods A randomized, double-blind study was conducted on 12 volunteers who met the inclusion criteria from October to November 2014. All volunteers had their right and left ring finger pulps injected with either one-per-mil solution or 2% lidocaine. Semmes-Weinstein and two-point discrimination tests were used to test sensation. Visual analogue scale was recorded at the time when the finger lost its sensation and when it regained normal sensation to measure the OOA and DOA. The data were then analyzed with a paired t-test and a Wilcoxon signed-rank test. Results The OOA and DOA of 2% plain lidocaine were 1 minute and 99.67 minutes, respectively. Meanwhile, 0.2% lidocaine in a one-per-mil tumescent solution showed an OOA of 5 minutes and a DOA of 186.83 minutes. The OOA of 0.2% lidocaine in a one-per-mil tumescent solution is statistically shorter than 2% plain lidocaine (P=0.04); while its DOA is statistically longer than 2% plain lidocaine (P<0.001). Conclusions The 0.2% lidocaine in a one-per-mil tumescent solution is statistically and clinically superior to 2% plain lidocaine in achieving longer duration of local anesthesia. PMID:27218026

  11. Sustainable catalysis: rational Pd loading on MIL-101Cr-NH2 for more efficient and recyclable Suzuki-Miyaura reactions.

    PubMed

    Pascanu, Vlad; Yao, Qingxia; Bermejo Gómez, Antonio; Gustafsson, Mikaela; Yun, Yifeng; Wan, Wei; Samain, Louise; Zou, Xiaodong; Martín-Matute, Belén

    2013-12-16

    Palladium nanoparticles have been immobilized into an amino-functionalized metal-organic framework (MOF), MIL-101Cr-NH2, to form Pd@MIL-101Cr-NH2. Four materials with different loadings of palladium have been prepared (denoted as 4-, 8-, 12-, and 16 wt%Pd@MIL-101Cr-NH2). The effects of catalyst loading and the size and distribution of the Pd nanoparticles on the catalytic performance have been studied. The catalysts were characterized by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared (FTIR) spectroscopy, powder X-ray diffraction (PXRD), N2-sorption isotherms, elemental analysis, and thermogravimetric analysis (TGA). To better characterize the palladium nanoparticles and their distribution in MIL-101Cr-NH2, electron tomography was employed to reconstruct the 3D volume of 8 wt%Pd@MIL-101Cr-NH2 particles. The pair distribution functions (PDFs) of the samples were extracted from total scattering experiments using high-energy X-rays (60 keV). The catalytic activity of the four MOF materials with different loadings of palladium nanoparticles was studied in the Suzuki-Miyaura cross-coupling reaction. The best catalytic performance was obtained with the MOF that contained 8 wt% palladium nanoparticles. The metallic palladium nanoparticles were homogeneously distributed, with an average size of 2.6 nm. Excellent yields were obtained for a wide scope of substrates under remarkably mild conditions (water, aerobic conditions, room temperature, catalyst loading as low as 0.15 mol%). The material can be recycled at least 10 times without alteration of its catalytic properties. PMID:24265270

  12. Noble metals can have different effects on photocatalysis over metal-organic frameworks (MOFs): a case study on M/NH₂-MIL-125(Ti) (M=Pt and Au).

    PubMed

    Sun, Dengrong; Liu, Wenjun; Fu, Yanghe; Fang, Zhenxing; Sun, Fangxiang; Fu, Xianzhi; Zhang, Yongfan; Li, Zhaohui

    2014-04-14

    M-doped NH2-MIL-125(Ti) (M=Pt and Au) were prepared by using the wetness impregnation method followed by a treatment with H2 flow. The resultant samples were characterized by powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), X-ray absorption fine structure (XAFS) analyses, N2-sorption BET surface area, and UV/Vis diffuse reflectance spectroscopy (DRS). The photocatalytic reaction carried out in saturated CO2 with triethanolamine (TEOA) as sacrificial agent under visible-light irradiations showed that the noble metal-doping on NH2-MIL-125(Ti) promoted the photocatalytic hydrogen evolution. Unlike that over pure NH2-MIL-125(Ti), in which only formate was produced, both hydrogen and formate were formed over Pt- and Au-loaded NH2-MIL-125(Ti). However, Pt and Au have different effects on the photocatalytic performance for formate production. Compared with pure NH2-MIL-125(Ti), Pt/NH2-MIL-125(Ti) showed an enhanced activity for photocatalytic formate formation, whereas Au has a negative effect on this reaction. To elucidate the origin of the different photocatalytic performance, electron spin resonance (ESR) analyses and density functional theory (DFT) calculations were carried out over M/NH2-MIL-125(Ti).The photocatalytic mechanisms over M/NH2-MIL-125(Ti) (M=Pt and Au) were proposed. For the first time, the hydrogen spillover from the noble metal Pt to the framework of NH2-MIL-125(Ti) and its promoting effect on the photocatalytic CO2 reduction is revealed. The elucidation of the mechanism on the photocatalysis over M/NH2-MIL-125(Ti) can provide some guidance in the development of new photocatalysts based on MOF materials. This study also demonstrates the potential of using noble metal-doped MOFs in photocatalytic reactions involving hydrogen as a reactant, like hydrogenation reactions. PMID:24644131

  13. Antarctic lunar meteorites Yamato-793169, Asuka-881757, MIL 05035, and MET 01210 (YAMM): Launch pairing and possible cryptomare origin

    NASA Astrophysics Data System (ADS)

    Arai, Tomoko; Ray Hawke, B.; Giguere, Thomas A.; Misawa, Keiji; Miyamoto, Masamichi; Kojima, Hideyasu

    2010-04-01

    The Antarctic lunar meteorite Meteorite Hills (MET) 01210 is a polymict regolith breccia, dominantly composed of mare basalt components. One relatively large (2.7 × 4.7 mm) basalt clast in MET 01210 (MET basalt) shows remarkable mineralogical similarities to the lunar-meteorite crystalline mare basalts Yamato (Y)-793169, Asuka (A)-881757, and Miller Range (MIL) 05035. All four basalts have similar rock texture, mineral assemblage, mineral composition, pyroxene crystallization trend, and pyroxene exsolution lamellae. The estimated TiO 2 contents (˜2.0 wt%) of the MET basalt and MIL 05035 are close to the bulk-rock TiO 2 contents of Y-793169 and A-881757. These similarities suggest that Y-793169, A-881757, MIL 05035, and the MET basalt came from the same basalt flow, which we designate the YAMM basalt. The source-basalt pairing of the YAMM is also supported by their similar REE abundances, crystallization ages (approx. 3.8-3.9 Ga), and isotopic compositions (low U/Pb, low Rb/Sr, and high Sm/Nd). The pyroxene exsolution lamellae, which are unusually coarse (up to a few microns) by mare standards, imply a relatively slow cooling in an unusually thick lava and/or subsequent annealing within a cryptomare. Reported noble gas and CRE data with close launch ages (˜1 Ma) and ejection depths (deeper than several meters) among the four meteorites further indicate their simultaneous ejection from the moon. Despite the marginally close terrestrial ages, pairing in the conventional Earth-entry sense seems unlikely because of the remote recovery sites among the YAMM meteorites. The high abundance (68%) of mare components in MET 01210 estimated from a two-component mixing model calculation could have resulted from either lateral mixing at a mare-highland boundary or vertical mixing in a cryptomare. The proportion of mare materials in MET 01210 is greater than in Apollo core samples at the mare-highland boundary. The burial depth (>several meters deep) inferred from the lack of surface irradiation of MET 01210 exceeds the typical mare regolith thickness (a few meters). Thus, the source of the YAMM meteorites is likely a terrain of locally high mare-highland mixing within a cryptomare. We searched for a possible source crater of the YAMM meteorites within the well-defined cryptomare, based on the multiple constraints obtained from this study and published data. An unnamed 1.4 km-diameter crater (53°W, 44.5°S) on the floor of the Schickard crater is the most suitable source for the YAMM meteorites. The 238U/ 204Pb ( μ) value of the YAMM basalts is extremely low, relative to those of the Apollo mare basalts, but comparable to those of the Luna 24 very low-Ti basalts. The low- μ source indicates a derivation from a less differentiated mantle with a lack of KREEP components. Although the chemical sources of materials and heat source of melting might be independent, the heat source that generated the source magma of the YAMM and Luna 24 basalts may not be related to KREEP, unlike the case of the Apollo basalts. The distinct chemical and isotopic compositions of mantle sources between the Apollo basalts and the YAMM/Lunar 24 basalts imply differences in mantle composition and thermal evolution between the Procellarum KREEP Terrane (PKT) and non-PKT regions of the nearside.

  14. Martian fluid and Martian weathering signatures identified in Nakhla, NWA 998 and MIL 03346 by halogen and noble gas analysis

    NASA Astrophysics Data System (ADS)

    Cartwright, J. A.; Gilmour, J. D.; Burgess, R.

    2013-03-01

    We report argon (Ar) noble gas, Ar-Ar ages and halogen abundances (Cl, Br, I) of Martian nakhlites Nakhla, NWA 998 and MIL 03346 to determine the presence of Martian hydrous fluids and weathering products. Neutron-irradiated samples were either crushed and step-heated (Nakhla only), or simply step-heated using a laser or furnace, and analysed for noble gases using an extension of the 40Ar-39Ar technique to determine halogen abundances. The data obtained provide the first isotopic evidence for a trapped fluid that is Cl-rich, has a strong correlation with 40ArXS (40ArXS = 40Armeasured - 40Arradiogenic) and displays 40ArXS/36Ar of ˜1000 - consistent with the Martian atmosphere. This component was released predominantly in the low temperature and crush experiments, which may suggest a fluid inclusion host. For the halogens, we observe similar Br/Cl and I/Cl ratios between the nakhlites and terrestrial reservoirs, which is surprising given the absence of crustal recycling, organic matter and frequent fluid activity on Mars. In particular, Br/Cl ratios in our Nakhla samples (especially olivine) are consistent with previously analysed Martian weathering products, and both low temperature and crush analyses show a similar trend to the evaporation of seawater. This may indicate that surface brines play an important role on Mars and on halogen assemblages within Martian meteorites and rocks. Elevated I/Cl ratios in the low temperature NWA 998 and MIL 03346 releases may relate to in situ terrestrial contamination, though we are unable to distinguish between low temperature terrestrial or Martian components. Whilst estimates of the amount of water present based on the 36Ar concentrations are too high to be explained by a fluid component alone, they are consistent with a mixed-phase inclusion (gas and fluid) or with shock-implanted Martian atmospheric argon. The observed fluid is dilute (low salinity, but high Br/Cl and I/Cl ratios), contains a Martian atmospheric component, and may represent a mixture of a shallow fluid with one derived from fluid circulation within the nakhlite cumulate pile - with heat for fluid circulation supplied by either the igneous intrusion or by an impact event.

  15. Direct carbonization of cobalt-doped NH2-MIL-53(Fe) for electrocatalysis of oxygen evolution reaction.

    PubMed

    Han, Yujie; Zhai, Junfeng; Zhang, Lingling; Dong, Shaojun

    2016-01-14

    In this work, we synthesized high-performance electrocatalysts for oxygen evolution reaction (OER) by one-step carbonization of cobalt(Co)-doped NH2-MIL-53(Fe) with different molar ratios between Fe and Co. The results showed that the as-prepared composite with a molar ratio between Fe and Co = 1 : 3 and the calcination temperature of 550 °C displayed the best OER activity, denoted as MOF(Fe1-Co3)550N. The MOF(Fe1-Co3)550N possesses a microporous structure with a high Brunauer-Emmett-Teller (BET) surface area of 235.37 m(2)·g(-1). It shows excellent OER catalytic behavior in 0.1 M KOH solution. The overpotential at 10 mA cm(-2) is 0.39 V and the Tafel slope is 72.9 mV dec(-1), which is comparable to that of the as-synthesized RuO2. The satisfactory results are attributed to the presence of pyridine N, Co3O4, the enlarged surface area and the micropore structures after calcination. PMID:26661843

  16. Gas Metal Arc Welding Process Modeling and Prediction of Weld Microstructure in MIL A46100 Armor-Grade Martensitic Steel

    NASA Astrophysics Data System (ADS)

    Grujicic, M.; Arakere, A.; Ramaswami, S.; Snipes, J. S.; Yavari, R.; Yen, C.-F.; Cheeseman, B. A.; Montgomery, J. S.

    2013-06-01

    A conventional gas metal arc welding (GMAW) butt-joining process has been modeled using a two-way fully coupled, transient, thermal-mechanical finite-element procedure. To achieve two-way thermal-mechanical coupling, the work of plastic deformation resulting from potentially high thermal stresses is allowed to be dissipated in the form of heat, and the mechanical material model of the workpiece and the weld is made temperature dependent. Heat losses from the deposited filler-metal are accounted for by considering conduction to the adjoining workpieces as well as natural convection and radiation to the surroundings. The newly constructed GMAW process model is then applied, in conjunction with the basic material physical-metallurgy, to a prototypical high-hardness armor martensitic steel (MIL A46100). The main outcome of this procedure is the prediction of the spatial distribution of various crystalline phases within the weld and the heat-affected zone regions, as a function of the GMAW process parameters. The newly developed GMAW process model is validated by comparing its predictions with available open-literature experimental and computational data.

  17. The alternate AP-1 adaptor subunit Apm2 interacts with the Mil1 regulatory protein and confers differential cargo sorting

    PubMed Central

    Whitfield, Shawn T.; Burston, Helen E.; Bean, Björn D. M.; Raghuram, Nandini; Maldonado-Báez, Lymarie; Davey, Michael; Wendland, Beverly; Conibear, Elizabeth

    2016-01-01

    Heterotetrameric adaptor protein complexes are important mediators of cargo protein sorting in clathrin-coated vesicles. The cell type–specific expression of alternate μ chains creates distinct forms of AP-1 with altered cargo sorting, but how these subunits confer differential function is unclear. Whereas some studies suggest the μ subunits specify localization to different cellular compartments, others find that the two forms of AP-1 are present in the same vesicle but recognize different cargo. Yeast have two forms of AP-1, which differ only in the μ chain. Here we show that the variant μ chain Apm2 confers distinct cargo-sorting functions. Loss of Apm2, but not of Apm1, increases cell surface levels of the v-SNARE Snc1. However, Apm2 is unable to replace Apm1 in sorting Chs3, which requires a dileucine motif recognized by the γ/σ subunits common to both complexes. Apm2 and Apm1 colocalize at Golgi/early endosomes, suggesting that they do not associate with distinct compartments. We identified a novel, conserved regulatory protein that is required for Apm2-dependent sorting events. Mil1 is a predicted lipase that binds Apm2 but not Apm1 and contributes to its membrane recruitment. Interactions with specific regulatory factors may provide a general mechanism to diversify the functional repertoire of clathrin adaptor complexes. PMID:26658609

  18. Size- and morphology-controllable synthesis of MIL-96 (Al) by hydrolysis and coordination modulation of dual aluminium source and ligand systems.

    PubMed

    Liu, Dandan; Liu, Yunqi; Dai, Fangna; Zhao, Jinchong; Yang, Kang; Liu, Chenguang

    2015-10-01

    In this paper, an efficient method to fabricate Al-based metal organic framework (Al-MOF) MIL-96 crystals with controllable size and morphology, by mixing other forms of reactants to replace the coordination modulators or capping agents, is presented. The size and morphology of the MIL-96 crystals can be selectively varied by simply altering the ratio of dual reactants via their hydrolysis reaction. All the samples were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Fourier Transform Infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA) and nitrogen sorption. Then based on the BFDH theory, a mechanism for the impact of hydrolysis of reactants on the crystal size and morphology is presented and discussed. We also evaluated the performance of these MOFs as sorbents for capturing CO2, and they all show enhanced adsorption properties compared with the bulk material, displaying high adsorption capacities on CO2 at atmospheric pressure and ambient temperature. PMID:26309045

  19. A Cross-Correlated Trellis-Coded Quadrature Modulation Representation of MIL-STD Shaped Offset Quadrature Phase-Shift Keying

    NASA Astrophysics Data System (ADS)

    Simon, M. K.; Li, L.

    2003-08-01

    We show that MIL-STD shaped offset quadrature phase-shift keying (SOQPSK), a highly bandwidth-efficient constant-envelope modulation, can be represented in the form of a cross-correlated trellis-coded quadrature modulation, a generic structure containing both memory and cross-correlation between the in-phase and quadrature-phase channels. Such a representation allows identification of the optimum form of receiver for MIL-STD SOQPSK and at the same time, through modification of the equivalent I and Q encoders to recursive types, allows for it to be embedded as the inner code of a serial or parallel (turbo-like) concatenated coding structure together with iterative decoding.

  20. Highly selective adsorption and separation of aniline/phenol from aqueous solutions by microporous MIL-53(Al): a combined experimental and computational study.

    PubMed

    Xiao, Yuanlong; Han, Tongtong; Xiao, Gang; Ying, Yunpan; Huang, Hongliang; Yang, Qingyuan; Liu, Dahuan; Zhong, Chongli

    2014-10-21

    Experimental measurements have been combined with molecular simulations to investigate the adsorption and separation of aniline/phenol mixtures from aqueous solutions by the aluminum terephthalate MIL-53. The results show that the framework flexibility of this material plays a crucial role in the adsorption process and thus can greatly enhance the separation of the aniline/phenol mixture from their solutions. Compared with the conventional adsorbents, MIL-53(Al) shows the best performance for such systems of interest, from the points of view of both the adsorption capacities and the selectivities for aniline. The findings obtained in this work may facilitate more investigations in connection with the application of flexible nanoporous materials for the separation of organic compounds from liquid-phase environments. PMID:25251810

  1. An integrated approach to 300 kV electrostatic discharge application during component testing that will satisfy MIL-STD-331B Appendix F

    NASA Astrophysics Data System (ADS)

    Lehmann, Monty R.; Nial, Jack; Whitaker, Mike

    1992-11-01

    The widely differing methods of producing and applying a 300 kV electrostatic stimulus to components during testing to satisfy MIL-STD-331B Appendix F has resulted in uncertainty about the validity of some test results data. Problems encountered in test methodology are examined and possible solutions are proposed. The resulting integrated systematic approach is presented; specific equipment is described, and sample waveforms are shown. Test procedures are presented in a standardized format.

  2. Moessbauer and Electron Microprobe Studies of Density Separates of Martian Nakhlite Mil03346: Implications for Interpretation of Moessbauer Spectra Acquired by the Mars Exploration Rovers

    NASA Technical Reports Server (NTRS)

    Morris, R. V.; McKay, G. A.; Agresti, D. G.; Li, Loan

    2008-01-01

    Martian meteorite MIL03346 is described as an augite-rich cumulate rock with approx.80%, approx.3%, and approx.21% modal phase proportions of augite (CPX), olivine and glassy mesostasis, respectively, and is classified as a nakhlite [1]. The Mossbauer spectrum for whole rock (WR) MIL 03346 is unusual for Martian meteorites in that it has a distinct magnetite subspectrum (7% subspectral area) [2]. The meteorite also has products of pre-terrestrial aqueous alteration ("iddingsite") that is associated primarily with the basaltic glass and olivine. The Mossbauer spectrometers on the Mars Exploration Rovers have measured the Fe oxidation state and the Fe mineralogical composition of rocks and soils on the planet s surface since their landing in Gusev Crater and Meridiani Planum in January, 2004 [3,4]. The MIL 03346 meteorite provides an opportunity to "ground truth" or refine Fe phase identifications. This is particularly the case for the so-called "nanophase ferric oxide" (npOx) component. NpOx is a generic name for a ferric rich product of oxidative alteration. On Earth, where we can take samples apart and study individual phases, examples of npOx include ferrihydrite, schwertmannite, akagaaneite, and superparamagnetic (small particle) goethite and hematite. It is also possible for ferric iron to be associated to some unknown extent with igneous phases like pyroxene. We report here an electron microprobe (EMPA) and Moessbauer (MB) study of density separates of MIL 03346. The same separates were used for isotopic studies by [5]. Experimental techniques are described by [6,7].

  3. Turning MIL-53(Al) redox-active by functionalization of the bridging OH-group with 1,1'-ferrocenediyl-dimethylsilane.

    PubMed

    Meilikhov, Mikhail; Yusenko, Kirill; Fischer, Roland A

    2009-07-22

    The postsynthetic functionalization of the bridging OH-group between two metal centers of the secondary building units of MIL-53(Al) with 1,1'-ferrocenediyl-dimethylsilane is the proof of principle of a new, selective functionalization method of the "inorganic" part of the porous coordination polymer (PCP). The functionalized material was active in the liquid-phase oxidation of benzene to phenol as a test reaction for redox activity. PMID:19548678

  4. High-throughput aided synthesis of the porous metal-organic framework-type aluminum pyromellitate, MIL-121, with extra carboxylic acid functionalization.

    PubMed

    Volkringer, Christophe; Loiseau, Thierry; Guillou, Nathalie; Férey, Gérard; Haouas, Mohamed; Taulelle, Francis; Elkaim, Erik; Stock, Norbert

    2010-11-01

    A new porous metal-organic framework (MOF)-type aluminum pyromellitate (MIL-121 or Al(OH)[H(2)btec]·(guest), (guest = H(2)O, H(4)btec = pyromellitic acid) has been isolated by using a high-throughput synthesis method under hydrothermal conditions. Its structure was determined from powder X-ray diffraction analysis using synchrotron radiation (Soleil, France) and exhibits a network closely related to that of the MIL-53 series. It is a three-dimensional (3D) framework containing one-dimensional (1D) channels delimited by infinite trans-connected aluminum-centered octahedra AlO(4)(OH)(2) linked through the pyromellitate ligand. Here the organic ligand acts as tetradendate linker via two of the carboxylate groups. The two others remain non-bonded in their protonated form, and this constitutes a rare case of the occurrence of both bonding and non-bonding organic functionalities of the MOF family. The non-coordinated -COOH groups points toward the channels to get them an open form configuration. Within the tunnels are located unreacted pyromellitic acid and water species, which are evacuated upon heating, and a porous MIL-121 phase is obtained with a Brunauer-Emmett-Teller (BET) surface area of 162 m(2) g(-1). MIL-121 has been characterized by IR, thermogravimetry (TG) analyses, and solid state NMR spectroscopy employing a couple of two-dimensional (2D) techniques such as (1)H-(1)H SQ-DQ BABA, (1)H-(1)H SQ-SQ RFDR, (27)Al{(1)H} CPHETCOR and (27)Al MQMAS. PMID:20923169

  5. Adsorption of N/S heterocycles in the flexible metal-organic framework MIL-53(Fe(III)) studied by in situ energy dispersive X-ray diffraction.

    PubMed

    Van de Voorde, Ben; Munn, Alexis S; Guillou, Nathalie; Millange, Franck; De Vos, Dirk E; Walton, Richard I

    2013-06-14

    The adsorption of N/S-containing heterocyclic organic molecules in the flexible iron(III) terephthalate MIL-53, Fe(III)(OH)(0.6)F(0.4)(O2C-C6H4-CO2)·(H2O), from the liquid phase was studied with in situ energy dispersive X-ray diffraction (EDXRD), in order to follow the adsorption-induced expansion of the structure. For comparison with the diffraction data, liquid phase adsorption isotherms were recorded for uptake of benzothiophene, benzothiazole and indole in isopropanol and in heptane. The solvent not only influences pore opening but is also a competing guest. The in situ EDXRD experiments allow the kinetics of guest uptake and the competition with solvent to be monitored directly. Indole uptake is limited; this adsorbate is barely capable of opening the closed, either hydrated or dehydrated, MIL-53(Fe) structure, or of penetrating the isopropanol-containing material in the concentration range under study. When isopropanol is used as a solvent, the guest molecules benzothiophene and benzothiazole must be present at a certain threshold concentration before substantial adsorption into the metal-organic framework takes place, eventually resulting in full opening of the structure. The fully expanded structures of benzothiophene or benzothiazole loaded MIL-53(Fe) materials have Imcm symmetry and a unit cell volume of ca. 1600 Å(3), and upon uptake of the guest molecules by the closed form (unit cell volume ~1000 Å(3)) no intermediate crystalline phases are seen. Successful uptake by MIL-53(Fe) requires that the adsorbate is primarily a good hydrogen bond acceptor; additionally, based on UV-visible spectroscopy, a charge-transfer interaction between the S atoms of benzothiophene and the aromatic rings in the MOF pore wall is proposed. PMID:23439974

  6. Raster data transfer test using DATA DEVELOPMENT Inc. produced data: MIL-R-28002 Type I Raster. Quick Short Test Report

    SciTech Connect

    Not Available

    1992-03-18

    The DoD Computer-aided Acquisition and Logistic Support (CALS) Test Network (CTN) is conducting tests of the military standard for the Automated Interchange of Technical Information, MIL-STD-1840A, and its companion suite of specifications. The CTN is a DoD-sponsored confederation of voluntary participants from industry and government, managed by the Air Force Logistics Command. The primary purpose of the CTN is to evaluate the effectiveness of the CALS standards for technical data interchange and to demonstrate the capability and operational suitability of these standards. To this end, testing should represent the systems and applications in use by a large number of participants. Sampling a wide cross-section of industry and government will gain feedback on the various interpretations of the standards and broaden the base of industry participation in the CALS initiative. This test was conducted to allow DATA DEVELOPMENT, Inc, to demonstrate their ability to generate a MIL-R-28002 data file. The objective was to evaluate their interpretation of the MIL-R-28002 standards, thereby assisting the CTN in substantiating the validity of the standards or recommending changes to these standards and the references to national or international standards. Additionally, Quick Short Test Reports (QSTRS) are intended to promote industry and government participation in the CALS initiative, developing a level of confidence in the technology, and furthering mission objectives.

  7. The Sierra de Mil Cumbres, Michoacán, México: Transitional volcanism between the Sierra Madre Occidental and the Trans-Mexican Volcanic Belt

    NASA Astrophysics Data System (ADS)

    Gómez-Vasconcelos, Martha Gabriela; Garduño-Monroy, Víctor Hugo; Macías, José Luis; Layer, Paul W.; Benowitz, Jeff A.

    2015-08-01

    The Sierra de Mil Cumbres is a Miocene volcanic range located in central México, in the north-eastern part of the State of Michoacán, near the city of Morelia. Structurally it is a ENE-trending horst that covers an area of 1022 km2 (approximately 20 km wide × 60 km long) and contains exposures of chemically-bimodal volcanism in the form of ignimbrites, lava domes, lava flows, cinder cones, and related deposits. The main volcanic manifestations of this range are the La Escalera Caldera (16.3-23 Ma), the Garnica Volcanic Complex (18.3-17.9 Ma), the Atécuaro Caldera (16.3-19.4 Ma), and the Indaparapeo Volcanic Complex (14.1-17.5 Ma). The Sierra de Mil Cumbres stands in space and time at the intersection between the Miocene-Recent Trans-Mexican Volcanic Belt and the Late Cretaceous-Early Miocene Sierra Madre Occidental, and so provides new insights into the geological evolution of central México. Arc volcanism in the Sierra de Mil Cumbres was initiated by a massive NNW-SSE extension, probably during the counterclockwise rotation of the Sierra Madre Occidental. New geological mapping, stratigraphic analysis, detailed geochemistry and 40Ar/39Ar geochronology demonstrates that this intra-plate volcanism was emplaced between 14 and 23 Ma.

  8. Monolithic metal-organic framework MIL-53(Al)-polymethacrylate composite column for the reversed-phase capillary liquid chromatography separation of small aromatics.

    PubMed

    Yusuf, Kareem; Badjah-Hadj-Ahmed, Ahmed Yacine; Aqel, Ahmad; ALOthman, Zeid Abdullah

    2016-03-01

    A monolithic capillary column containing a composite of metal-organic framework MIL-53(Al) incorporated into hexyl methacrylate-co-ethylene dimethacrylate was prepared to enhance the separation of mixtures of small aromatic compounds by using capillary liquid chromatography. The addition of 10 mg/mL MIL-53(Al) microparticles increased the micropore content in the monolithic matrix and increased the Brunauer-Emmett-Teller surface area from 26.92 to 85.12 m(2) /g. The presence of 1,4-benzenedicarboxylate moieties within the structure of MIL-53(Al) as an organic linker greatly influenced the separation of aromatic mixtures through π-π interactions. High-resolution separation was obtained for a series of alkylbenzenes (with resolution factors in the range 0.96-1.75) in less than 8 min, with 14 710 plates/m efficiency for propylbenzene, using a binary polar mobile phase of water/acetonitrile in isocratic mode. A reversed-phase separation mechanism was indicated by the increased retention factor and resolution as the water percentage in the mobile phase increased. A stability study on the composite column showed excellent mechanical stability under various conditions. The higher resolution and faster separation observed at increased temperature indicated an exothermic separation, whereas the negative values for the free energy change of transfer indicated a spontaneous process. PMID:26711438

  9. Charge distribution in metal organic framework materials: transferability to a preliminary molecular simulation study of the CO(2) adsorption in the MIL-53 (Al) system.

    PubMed

    Ramsahye, N A; Maurin, G; Bourrelly, S; Llewellyn, P; Loiseau, T; Ferey, G

    2007-03-01

    Density functional theory calculations have been performed in order to extract the charge distribution in the aluminium-containing MIL-53 structure, to allow further computational studies of adsorption in these materials. Both cluster and periodic methods have been used and the charges calculated for each atom constituting the organic and inorganic part of the material, were discussed. Preliminary grand canonical Monte Carlo simulations, based on a consistent set of potential parameters and this newly derived charge distribution, predicted for enthalpies of adsorption for CO(2) at low coverage in the "large" and "narrow" pore versions of MIL-53 (Al) to be significantly different. These calculated enthalpies reproduced the two distinct ranges of values observed by microcalorimetry on either side of 6 bars quite well. This agreement between experiment and simulation validated our previous assumption, suggesting a structural switching of the hybrid material during the adsorption process. The microscopic mode of interaction between the hybrid porous framework and the CO(2) adsorption was then carefully analysed in both of the MIL-53 (Al) structures. PMID:17311147

  10. Programming MOFs for water sorption: amino-functionalized MIL-125 and UiO-66 for heat transformation and heat storage applications.

    PubMed

    Jeremias, Felix; Lozan, Vasile; Henninger, Stefan K; Janiak, Christoph

    2013-12-01

    Sorption-based heat transformation and storage appliances are very promising for utilizing solar heat and waste heat in cooling or heating applications. The economic and ecological efficiency of sorption-based heat transformation depends on the availability of suitable hydrophilic and hydrothermally stable sorption materials. We investigated the feasibility of using the metal-organic frameworks UiO-66(Zr), UiO-67(Zr), H2N-UiO-66(Zr) and H2N-MIL-125(Ti) as sorption materials in heat transformations by means of volumetric water adsorption measurements, determination of the heat of adsorption and a 40-cycle ad/desorption stress test. The amino-modified compounds H2N-UiO-66 and H2N-MIL-125 feature high heat of adsorption (89.5 and 56.0 kJ mol(-1), respectively) and a very promising H2O adsorption isotherm due to their enhanced hydrophilicity. For H2N-MIL-125 the very steep rise of the H2O adsorption isotherm in the 0.1 < p/p0 < 0.2 region is especially beneficial for the intended heat pump application. PMID:23864023

  11. A nanosized metal-organic framework of Fe-MIL-88NH₂ as a novel peroxidase mimic used for colorimetric detection of glucose.

    PubMed

    Liu, Ya Li; Zhao, Xi Juan; Yang, Xiao Xi; Li, Yuan Fang

    2013-08-21

    In this paper, a nanosized porous metal-organic framework, Fe-MIL-88NH₂, was facilely prepared with a uniform octahedral shape by the addition of acetic acid, and for the first time was demonstrated to possess intrinsic peroxidase-like activity. Kinetic analysis and electron spin resonance measurements indicated that the catalytic behavior was consistent with typical Michaelis-Menten kinetics and follows a ping-pong mechanism. As a novel peroxidase mimic material, Fe-MIL-88NH₂ shows the advantages of high catalytic efficiency, ultrahigh stability and high biocompatibility in aqueous medium compared with natural enzymes and other peroxidase nanomimetics. Here, Fe-MIL-88NH₂ was used to quickly catalyze oxidation of the peroxidase substrate 3,3',5,5'-tetramethylbenzidine (TMB) in the presence of H₂O₂ to produce a colored product, which provided a simple, sensitive and selective method for the colorimetric detection of glucose. Glucose could be linearly detected in the range from 2.0 × 10⁻⁶ to 3.0 × 10⁻⁴ M with a detection limit of 4.8 × 10⁻⁷ M, and the color variation for glucose response was also obvious by visual observation at concentrations as low as 2.0 × 10⁻⁶ M. More importantly, the colorimetric method could be successfully applied to the determination of glucose in diluted serum samples. PMID:23775015

  12. A novel dispersive solid-phase extraction method using metal-organic framework MIL-101 as the adsorbent for the analysis of benzophenones in toner.

    PubMed

    Li, Ning; Zhu, Quanfei; Yang, Yang; Huang, Jianlin; Dang, Xueping; Chen, Huaixia

    2015-01-01

    Metal-organic frameworks (MOFs) have been paid widespread attention in the field of adsorption and separation materials due to its porosity, large specific surface area, unsaturated metal-ligand sites and structural diversity. In this study, the green powder MIL-101 was synthesized and used for the extraction of benzophenone, 2,4-dihydroxybenzophenone and 2-hydroxy-4-methoxy-benzophenone from toner samples for the first time. The synthesized MIL-101 was characterized by X-ray diffraction, scanning electron microscopy, thermogravimetry and nitrogen adsorption porosimetry. The MIL-101 was applied as the dispersive solid phase extraction (DSPE) adsorbent for the extraction and preconcentration of benzophenone, 2,4-dihydroxybenzophenone and 2-hydroxy-4-methoxy-benzophenone from toner samples. The extraction conditions were investigated. Under the optimized conditions, a DSPE-HPLC method for the determination of benzophenone, 2,4-dihydroxybenzophenone and 2-hydroxy-4-methoxy-benzophenone was developed. The method yielded a linear calibration curve in the concentration ranges from 4.0 to 3500 μg L(-1) for the three analytes in toner samples with regression coefficients (r(2)) of 0.9992, 0.9999 and 0.9990, respectively. Limits of detection were 1.2, 1.2 and 0.9 μg L(-1), respectively. Both the intra-day and inter-day precisions (RSDs) were <10%. PMID:25476369

  13. Metal-organic framework MIL-53(Al) as a solid-phase microextraction adsorbent for the determination of 16 polycyclic aromatic hydrocarbons in water samples by gas chromatography-tandem mass spectrometry.

    PubMed

    Chen, Xiang-Feng; Zang, Hao; Wang, Xia; Cheng, Jian-Guang; Zhao, Ru-Song; Cheng, Chuan-Ge; Lu, Xiao-Qing

    2012-11-21

    In this paper, the potential applications of metal-organic framework (MOF) materials as fiber coatings for the solid-phase microextraction (SPME) of polycyclic aromatic hydrocarbons (PAHs) in water samples were explored. Fibers coated with MIL-53(Al, Cr, Fe) materials were fabricated by an adhesive method for SPME. The quantitation was performed by gas chromatography-tandem mass spectrometry (GC-MS/MS) using the multiple reaction monitoring mode. Among the three MIL-53(M) coatings, MIL-53(Al) showed the highest extraction efficiency towards PAHs under the current fabrication procedure. Under optimized conditions, the MIL-53(Al)-coated fiber showed good precision (relative standard deviation <12.5%), low detection limits (0.10 ng L(-1) to 0.73 ng L(-1), S/N = 3), and good linearity (R(2) > 0.98) for aqueous solutions containing 16 PAH . The fiber also offered high thermal and chemical stability. The method developed based on MIL-53(Al) SPME-GC-MS/MS was successfully applied in the analysis of real water samples. Based on the simulation results, the PAHs were adsorbed on MIL-53(Al) primarily through the hydrophobic and π-π interactions between PAHs and the organic linker of the material. The results presented in this paper indicate that water-stable MOF materials have great potential for the SPME of aromatic compounds in water samples. PMID:23042089

  14. MIL1A

    Atmospheric Science Data Center

    2014-09-03

    ... MISR Level 1A camera charge-coupled device (CCD) Science Data: Reformatted Annotated Level 1A product of the CCD science data. ... :  Data Product Specification Versioning History:  Ellipsoid, Terrain, Browse, CCD, Radiance SCAR-B ...

  15. [Synthesis of Magnetic Metal Organic Framework Fe3O4@NH2-MIL-53 (Al) Materials and Application to the Adsorption of Lead].

    PubMed

    Zhao, Fang-biao; Song, Nai-zhong; Ning, Wei-kun; Jia, Qiong

    2015-09-01

    Metal organic framework, a novel class of organic inorganic hybrid functional materials, has been widely used in the fields of gas adsorption, catalysis, separation, and biological medicine due to its large specific surface area, diverse structural, and adjustable channel. In this work, a new amine-functionalized magnetic metal-organic framework material was synthesized. Nano-Fe3O4 was prepared by a solvothermal method, after which polyvinyl pyrrolidone was employed to modify Fe3O4. Finally, amino groups were introduced to prepare Fe3O4@NH2-MIL-53(Al). The crystal structure and functional groups of the material were characterized by means of X-ray diffraction (XRD) and Fourier transform infrared spectrometry (FT-IR). Combined with flame atomic absorption spectroscopy (FAAS), the adsorption of lead by the magnetic adsorbent was investigated. The magnetic adsorbent possesses high adsorption capacity because of the large specific surface area of Fe3O4@NH2-MIL-53(Al) and the coordination between amino group and lead. Experimental conditions affecting the adsorption percentage were discussed and the experimental operation parameters were optimized (pH value of 6.0 and adsorption time of 120 min). Kinetics and thermodynamics studies were conducted for the adsorption process. Langmuir/Freundlich and pseudo-first-order/pseudo-second-order models were applied to analyze the experimental data. Thermodynamic functions, i. e., changes of Gibbs energy, entropy, and enthalpy, were calculated from temperature experiments. In addition, the regeneration of the adsorbent was considered with hydrochloric acid as the desorption solution. Several adsorption and desorption experiments were carried out, illustrating that the Fe3O4@NH2-MIL-53(Al) adsorbent can be used repeatedly. PMID:26669144

  16. Performance comparisons of Navy jet mix and MIL-F-5624A (JP-3) fuels in tubular and annular combustors / Richard J. McCafferty

    NASA Technical Reports Server (NTRS)

    Mccafferty, Richard J

    1954-01-01

    The performances of Navy Jet Mix and MIL-F-5624A (JP-3) fuels were compared in J33, J47, and NACA experimental annular combustion chambers. Combustion efficiencies, altitude operational limits, and carbon-forming tendencies wer determined and discussed. The results indicate that Jet Mix fuel can be utilized satisfactorily in a number of current turbojet engines over the normal operating range. Small differences in combustion efficiences and altitude operational limits existed between the two fuels but these differences depended on the particular combustor and simulated altitude and rotor speed condition. Excessive carbon deposition is not predicted for Jet Mix fuel, although this property may be marginal.

  17. A real time data acquisition system using the MIL-STD-1553B bus. [for transmission of data to host computer for control law processing

    NASA Technical Reports Server (NTRS)

    Peri, Frank, Jr.

    1992-01-01

    A flight digital data acquisition system that uses the MIL-STD-1553B bus for transmission of data to a host computer for control law processing is described. The instrument, the Remote Interface Unit (RIU), can accommodate up to 16 input channels and eight output channels. The RIU employs a digital signal processor to perform local digital filtering before sending data to the host. The system allows flexible sensor and actuator data organization to facilitate quick control law computations on the host computer. The instrument can also run simple control laws autonomously without host intervention. The RIU and host computer together have replaced a similar larger, ground minicomputer system with favorable results.

  18. Adsorption of Uranyl ions on Amine-functionalization of MIL-101(Cr) Nanoparticles by a Facile Coordination-based Post-synthetic strategy and X-ray Absorption Spectroscopy Studies

    NASA Astrophysics Data System (ADS)

    Zhang, Jian-Yong; Zhang, Na; Zhang, Linjuan; Fang, Yongzheng; Deng, Wei; Yu, Ming; Wang, Ziqiang; Li, Lina; Liu, Xiyan; Li, Jingye

    2015-09-01

    By a facile coordination-based post-synthetic strategy, the high surface area MIL-101(Cr) nanoparticles was functionallized by grafting amine group of ethylenediamine (ED) on coordinatively unsaturated Cr(III) centers, yielding a series of ED-MIL-101(Cr)-based adsorbents and their application for adsorption of U(VI) from aqueous solution were also studied. The obtained ED-functionallized samples with different ED contents were characterized by powder X-ray diffraction (PXRD), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), FTIR, elemental analysis (EA) and N2 adsorption and desorption isothermal. Compared with the pristine MIL-101(Cr) sorbents, the ED-functionallized MIL-101(Cr) exhibits significantly higher adsorption capacity for U(VI) ions from water with maximum adsorption capacities as high as 200 mg/g (corresponding to 100% extraction rate) at pH of 4.5 with ED/Cr ratio of 0.68 and the sorbed U(VI) ions can easily be desorbed at lower pH (pH ≤ 2.0). The adsorption mode of U(VI) ions and effects of grafted ED on the MIL-101(Cr) frameworks were also been studied by X-ray absorption spectroscopy (XAS). We believe that this work establishes a simple and energy efficient route to a novel type of functional materials for U(VI) ions extraction from solution via the post-synthetic modification (PSM) strategy.

  19. Adsorption of Uranyl ions on Amine-functionalization of MIL-101(Cr) Nanoparticles by a Facile Coordination-based Post-synthetic strategy and X-ray Absorption Spectroscopy Studies

    PubMed Central

    Zhang, Jian-Yong; Zhang, Na; Zhang, Linjuan; Fang, Yongzheng; Deng, Wei; Yu, Ming; Wang, Ziqiang; Li, Lina; Liu, Xiyan; Li, Jingye

    2015-01-01

    By a facile coordination-based post-synthetic strategy, the high surface area MIL-101(Cr) nanoparticles was functionallized by grafting amine group of ethylenediamine (ED) on coordinatively unsaturated Cr(III) centers, yielding a series of ED-MIL-101(Cr)-based adsorbents and their application for adsorption of U(VI) from aqueous solution were also studied. The obtained ED-functionallized samples with different ED contents were characterized by powder X-ray diffraction (PXRD), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), FTIR, elemental analysis (EA) and N2 adsorption and desorption isothermal. Compared with the pristine MIL-101(Cr) sorbents, the ED-functionallized MIL-101(Cr) exhibits significantly higher adsorption capacity for U(VI) ions from water with maximum adsorption capacities as high as 200 mg/g (corresponding to 100% extraction rate) at pH of 4.5 with ED/Cr ratio of 0.68 and the sorbed U(VI) ions can easily be desorbed at lower pH (pH ≤ 2.0). The adsorption mode of U(VI) ions and effects of grafted ED on the MIL-101(Cr) frameworks were also been studied by X-ray absorption spectroscopy (XAS). We believe that this work establishes a simple and energy efficient route to a novel type of functional materials for U(VI) ions extraction from solution via the post-synthetic modification (PSM) strategy. PMID:26354407

  20. Adsorption of Uranyl ions on Amine-functionalization of MIL-101(Cr) Nanoparticles by a Facile Coordination-based Post-synthetic strategy and X-ray Absorption Spectroscopy Studies.

    PubMed

    Zhang, Jian-Yong; Zhang, Na; Zhang, Linjuan; Fang, Yongzheng; Deng, Wei; Yu, Ming; Wang, Ziqiang; Li, Lina; Liu, Xiyan; Li, Jingye

    2015-01-01

    By a facile coordination-based post-synthetic strategy, the high surface area MIL-101(Cr) nanoparticles was functionallized by grafting amine group of ethylenediamine (ED) on coordinatively unsaturated Cr(III) centers, yielding a series of ED-MIL-101(Cr)-based adsorbents and their application for adsorption of U(VI) from aqueous solution were also studied. The obtained ED-functionallized samples with different ED contents were characterized by powder X-ray diffraction (PXRD), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), FTIR, elemental analysis (EA) and N2 adsorption and desorption isothermal. Compared with the pristine MIL-101(Cr) sorbents, the ED-functionallized MIL-101(Cr) exhibits significantly higher adsorption capacity for U(VI) ions from water with maximum adsorption capacities as high as 200 mg/g (corresponding to 100% extraction rate) at pH of 4.5 with ED/Cr ratio of 0.68 and the sorbed U(VI) ions can easily be desorbed at lower pH (pH ≤ 2.0). The adsorption mode of U(VI) ions and effects of grafted ED on the MIL-101(Cr) frameworks were also been studied by X-ray absorption spectroscopy (XAS). We believe that this work establishes a simple and energy efficient route to a novel type of functional materials for U(VI) ions extraction from solution via the post-synthetic modification (PSM) strategy. PMID:26354407

  1. Multi-frequency (S, X, Q and W-band) EPR and ENDOR Study of Vanadium(IV) Incorporation in the Aluminium Metal-Organic Framework MIL-53.

    PubMed

    Nevjestić, Irena; Depauw, Hannes; Leus, Karen; Kalendra, Vidmantas; Caretti, Ignacio; Jeschke, Gunnar; Van Doorslaer, Sabine; Callens, Freddy; Van Der Voort, Pascal; Vrielinck, Henk

    2015-10-01

    Doping the well-known metal-organic framework MIL-53(Al) with vanadium(IV) ions leads to significant changes in the breathing behaviour and might have repercussions on the catalytic behaviour as well. To understand the properties of such a doped framework, it is necessary to determine where dopant ions are actually incorporated. Electron paramagnetic resonance (EPR) and electron-nuclear double resonance (ENDOR) are applied to reveal the nearest environment of the paramagnetic vanadium(IV) dopant ions. EPR spectra of as-synthesised vanadium-doped MIL-53 are recorded at S-, X-, Q- and W-band microwave frequencies. The EPR spectra suggest that at low dopant concentrations (1.0-2.6 mol %) the vanadium(IV) ions are well dispersed in the matrix. Varying the vanadium dopant concentration within this range or the dopant salt leads to the same dominant EPR component. In the ENDOR spectra, hyperfine (HF) interactions with (1) H, (27) Al and (51) V nuclei are observed. The HF parameters extracted from simulations strongly suggest that the vanadium(IV) ions substitute Al in the framework. PMID:26305910

  2. Whole mitochondrial genome analysis of a family with NARP/MILS caused by m.8993T>C mutation in the MT-ATP6 gene.

    PubMed

    Kara, Bülent; Arıkan, Muzaffer; Maraş, Hülya; Abacı, Neslihan; Cakıris, Aris; Ustek, Duran

    2012-11-01

    Mutations in mitochondrial DNA (mtDNA) encoded nucleotide 8993 can cause NARP syndrome (neuropathy, ataxia, and retinitis pigmentosa) or MILS (maternally inherited Leigh syndrome). The rare T8993C mutation in the MT-ATP6 gene is generally considered to be clinically milder, but there is marked clinical heterogeneity ranging from asymptomatic carriers to fatal infantile Leigh syndrome. Clinical heterogeneity has mostly been attributed to mtDNA heteroplasmy, but environmental, autosomal, tissue-specific factors, nuclear modifier genes, and mtDNA variations may also modulate disease expression. Here, we report the results of whole mitochondrial genome analysis of a family with m.8993T>C mutation in the MT-ATP6 gene and associated with NARP/MILS, and discuss the familial inheritance, effects of variation in combinations and heteroplasmy levels on the clinical findings. The whole mitochondrial genome was sequenced with ~182× average depth of coverage per sample with next-generation sequencing technology. Thus, all heteroplasmic (>%10) and homoplasmic variations were determined (except for 727C insertion) and classified according to the associations with mitochondrial diseases. PMID:22819295

  3. Hierarchical hollow Fe2O3@MIL-101(Fe)/C derived from metal-organic frameworks for superior sodium storage.

    PubMed

    Li, Chengping; Hu, Qian; Li, Yan; Zhou, Hang; Lv, Zhaolin; Yang, Xiangjun; Liu, Lixiang; Guo, Hong

    2016-01-01

    A facile generic template-free strategy is employed to prepare hierarchical hollow hybrid Fe2O3@MIL-101(Fe)/C materials derived from metal-organic frameworks as anode materials for Na-ion batteries. The intrinsic hollow nanostructure can shorten the lengths for both electronic and ionic transport, enlarge the surface areas of electrodes, and improve accommodation of the volume change during Na(+) insertion/extraction cycling. Therefore, The stable reversible capacity of Fe2O3@MIL-101(Fe)/C electrode is 710 mAhg(-1), and can be retained at 662 mAhg(-1) after 200 cycles with the retention of 93.2%. Especially, its overall rate performance data confirm again the importance of the hierarchical hollow structures and multi-elements characteristics toward high capacities in both low and high current rates. This general strategy may shed light on a new avenue for fast synthesis of hierarchic hollow functional materials for energy storage, catalyst, sensor and other new applications. PMID:27150011

  4. Exsolution of Iron-Titanium Oxides in Magnetite in Miller Range (MIL) 03346 Nakhlite: Evidence for Post Crystallization Reduction in the Nakhlite Cumulate Pile

    NASA Technical Reports Server (NTRS)

    Righter, Kevin; Keller, L. P.; Rahman, Z.; Christoffersen, R.

    2012-01-01

    MIL 03346 is one of the most mesostasis-rich nakhlites [1] and thought to have equilibrated at oxygen fugacities near the fayalite-magnetite-quartz oxygen (FMQ) buffer ([2,3]). Studies of FeTi oxides in nakhlites have led to additional constraints on their equilibration temperatures and fO2s [4,5,6,7]. Comparison of these results to fO2s calculated for shergottites indicates that nakhlites are among the most oxidized samples from the martian meteorite suite [2]. The mesostasis of MIL 03346 contains skeletal titanomagnetite. Several scientists noticed several years ago (e.g. [8]) that this titanomagnetite contains very fine oxidation-driven exsolution lamellae (Figure 1). However, the lamellae are so small that they cannot be characterized by electron microprobe analysis (EMPA). Here we select several areas for focused ion beam (FIB) extraction, prepare transmission electron microscopy (TEM) foils, and identify and analyze the lamellae using TEM at the Johnson Space Center (JSC). The resulting analyses are combined with previous work on nakhlites to interpret the thermal and oxidation history of this meteorite group.

  5. Understanding the Adsorption of PFOA on MIL-101(Cr)-Based Anionic-Exchange Metal-Organic Frameworks: Comparing DFT Calculations with Aqueous Sorption Experiments.

    PubMed

    Liu, Kai; Zhang, Siyu; Hu, Xiyue; Zhang, Kunyang; Roy, Ajay; Yu, Gang

    2015-07-21

    To examine the effects of different functionalization methods on adsorption behavior, anionic-exchange MIL-101(Cr) metal-organic frameworks (MOFs) were synthesized using preassembled modification (PAM) and postsynthetic modification (PSM) methods. Perfluorooctanoic acid (PFOA) adsorption results indicated that the maximum PFOA adsorption capacity was 1.19 and 1.89 mmol g(-1) for anionic-exchange MIL-101(Cr) prepared by PAM and PSM, respectively. The sorption equilibrium was rapidly reached within 60 min. Our results indicated that PSM is a better modification technique for introducing functional groups onto MOFs for adsorptive removal because PAM places functional groups onto the aperture of the nanopore, which hinders the entrance of organic contaminants. Our experimental results and the results of complementary density functional theory calculations revealed that in addition to the anion-exchange mechanism, the major PFOA adsorption mechanism is a combination of Lewis acid/base complexation between PFOA and Cr(III) and electrostatic interaction between PFOA and the protonated carboxyl groups of the bdc (terephthalic acid) linker. PMID:26066631

  6. Hierarchical hollow Fe2O3@MIL-101(Fe)/C derived from metal-organic frameworks for superior sodium storage

    PubMed Central

    Li, Chengping; Hu, Qian; Li, Yan; Zhou, Hang; Lv, Zhaolin; Yang, Xiangjun; Liu, Lixiang; Guo, Hong

    2016-01-01

    A facile generic template-free strategy is employed to prepare hierarchical hollow hybrid Fe2O3@MIL-101(Fe)/C materials derived from metal-organic frameworks as anode materials for Na-ion batteries. The intrinsic hollow nanostructure can shorten the lengths for both electronic and ionic transport, enlarge the surface areas of electrodes, and improve accommodation of the volume change during Na+ insertion/extraction cycling. Therefore, The stable reversible capacity of Fe2O3@MIL-101(Fe)/C electrode is 710 mAhg−1, and can be retained at 662 mAhg−1 after 200 cycles with the retention of 93.2%. Especially, its overall rate performance data confirm again the importance of the hierarchical hollow structures and multi-elements characteristics toward high capacities in both low and high current rates. This general strategy may shed light on a new avenue for fast synthesis of hierarchic hollow functional materials for energy storage, catalyst, sensor and other new applications. PMID:27150011

  7. Correlation of Gas Permeability in a Metal-Organic Framework MIL-101(Cr)–Polysulfone Mixed-Matrix Membrane with Free Volume Measurements by Positron Annihilation Lifetime Spectroscopy (PALS)

    PubMed Central

    Jeazet, Harold B. Tanh; Koschine, Tönjes; Staudt, Claudia; Raetzke, Klaus; Janiak, Christoph

    2013-01-01

    Hydrothermally stable particles of the metal-organic framework MIL-101(Cr) were incorporated into a polysulfone (PSF) matrix to produce mixed-matrix or composite membranes with excellent dispersion of MIL-101 particles and good adhesion within the polymer matrix. Pure gas (O2, N2, CO2 and CH4) permeation tests showed a significant increase of gas permeabilities of the mixed-matrix membranes without any loss in selectivity. Positron annihilation lifetime spectroscopy (PALS) indicated that the increased gas permeability is due to the free volume in the PSF polymer and the added large free volume inside the MIL-101 particles. The trend of the gas transport properties of the composite membranes could be reproduced by a Maxwell model. PMID:24957061

  8. Metal-organic framework MIL-101(Cr) as a sorbent of porous membrane-protected micro-solid-phase extraction for the analysis of six phthalate esters from drinking water: a combination of experimental and computational study.

    PubMed

    Wang, Ting; Wang, Jian; Zhang, Conglu; Yang, Zhao; Dai, Xinpeng; Cheng, Maosheng; Hou, Xiaohong

    2015-08-01

    An attractive metal-organic framework (MOF) MIL-101(Cr) material was synthesized at the nanoscale and applied as a sorbent in the porous membrane-protected micro-solid-phase extraction (μ-SPE) device for the pre-concentration of phthalate esters (PAEs) in drinking water samples for the first time. Parameters influencing the extraction efficiency, such as the selection of sorbent materials, pH adjustment, the effect of salt, magnetic-stirring extraction time, the desorption solvent and the desorption time, were investigated. Under the optimum conditions, the limits of detection from gas chromatography-mass spectrometric analysis for PAEs varied from 0.004 to 0.02 μg L(-1). The linear ranges were from 0.1 to 50 μg L(-1) or from 0.2 to 50 μg L(-1) for the analytes with the relative standard deviations fluctuating from 0.8 to 10.9% (n = 5). The enrichment factors (EFs) for the target PAEs were varied from 143 to 187. MIL-101(Cr) exhibited remarkable advantages compared to activated carbon and MIL-100(Fe). On the other hand, the computational method was first used to predict the adsorption of MIL-101(Cr) towards PAEs. The molecular interactions and the free binding energies between MIL-101(Cr) and PAEs were observed and calculated in terms of the molecular modeling method. MIL-101(Cr) showed high potential in the analysis of PAEs at trace levels in drinking water. The computational result was consistent with the detected enrichment factors. The computational modeling accurately predicted the extraction efficiency of MOF-based material towards the target analytes. Therefore, the combination of experimental and computational study provided a new strategy on the trace contaminant analysis. PMID:26076497

  9. A facile synthesis of superparamagnetic Fe3O4 supraparticles@MIL-100(Fe) core-shell nanostructures: Preparation, characterization and biocompatibility.

    PubMed

    Yu, Shoushan; Wan, Jiaqi; Chen, Kezheng

    2016-01-01

    Superparamagnetic Fe3O4 supraparticles@MIL-100(Fe) core-shell nanostructure microspheres were successfully constructed by a facile step-by-step method. The polyacrylate formed in situ during the process of the preparation of Fe3O4 supraparticles not only acted as a stabilizer on the Fe3O4 nanoparticles surface, but also played a crucial role as a "bridge" in the initial stage of the framework components selectively assembly on the Fe3O4 supraparticle surfaces. The structure and composition of the obtained microspheres were characterized by SEM, TEM, DLS, XRD, FTIR, and TG analysis. The MPMS results revealed that the introduction of the MOF shells can inhibit the interplay among the neighboring Fe3O4 supraparticles while an external magnetic field applied. The well-dispersed microspheres are biocompatible, which endow the microspheres great potential in drug targeting applications with enhanced efficiency. PMID:26397925

  10. Experimental screening of porous materials for high pressure gas adsorption and evaluation in gas separations: application to MOFs (MIL-100 and CAU-10).

    PubMed

    Wiersum, Andrew D; Giovannangeli, Christophe; Vincent, Dominique; Bloch, Emily; Reinsch, Helge; Stock, Norbert; Lee, Ji Sun; Chang, Jong-San; Llewellyn, Philip L

    2013-02-11

    A high-throughput gas adsorption apparatus is presented for the evaluation of adsorbents of interest in gas storage and separation applications. This instrument is capable of measuring complete adsorption isotherms up to 40 bar on six samples in parallel using as little as 60 mg of material. Multiple adsorption cycles can be carried out and four gases can be used sequentially, giving as many as 24 adsorption isotherms in 24 h. The apparatus has been used to investigate the effect of metal center (MIL-100) and functional groups (CAU-10) on the adsorption of N(2), CO(2), and light hydrocarbons on MOFs. This demonstrates how it can serve to evaluate sample quality and adsorption reversibility, to determine optimum activation conditions and to estimate separation properties. As such it is a useful tool for the screening of novel adsorbents for different applications in gas separation, providing significant time savings in identifying potentially interesting materials. PMID:23298473

  11. Exploration of the mechanical behavior of metal organic frameworks UiO-66(Zr) and MIL-125(Ti) and their NH2 functionalized versions.

    PubMed

    Yot, Pascal G; Yang, Ke; Ragon, Florence; Dmitriev, Vladimir; Devic, Thomas; Horcajada, Patricia; Serre, Christian; Maurin, Guillaume

    2016-03-01

    The structural behaviour under mechanical stimuli of two metal organic frameworks, UiO-66(Zr) and MIL-125(Ti) and their amino-functionalized derivatives has been investigated by high-pressure powder X-ray diffraction up to 3.5 GPa. All these solids showed a gradual pressure-induced reversible decrease of their crystallinity and UiO-66(Zr)_NH2 material has been revealed as one of the most resilient MOFs reported so far corresponding to a very high bulk modulus. The mechanical behaviors of these MOFs have been correlated to their chemical and geometric features including the metal-oxygen coordination number, the nature of the organic linker, the porosity as well as their crystal density. PMID:26600004

  12. A COMS/SOS, 3 chip implementation of the MIL-STD-1750A Instruction Set and a 4 chip mega-rad hard equivalent

    NASA Astrophysics Data System (ADS)

    Hanna, W. A.

    This paper describes a CMOS/SOS, radiation hardened chip set that implements the MIL-STD-1750A Instruction Set. Two versions of this chip set have been developed: (1) a 3-chip implementation, consisting of a control unit (CU), an execution unit (EU), and an interrupt control unit (ICU); and (2) a 4-chip, mega-rad hardened implementation requires the use of two mega-rad hardened Cu chips, an Eu chip, and an ICU chip. Prototypes of the chips have been built. Fully functional prototypes are scheduled for June 1983. Full production is scheduled for mid 1984. The rate of execution is 940 KOPS (DAIS). A single chip replacement is planned for 1985 using a 2.5 micron feature size. A 4-6 MOPS (DAIS) throughput is expected using a single supply.

  13. Optimization of Gas Metal Arc Welding (GMAW) Process for Maximum Ballistic Limit in MIL A46100 Steel Welded All-Metal Armor

    NASA Astrophysics Data System (ADS)

    Grujicic, M.; Ramaswami, S.; Snipes, J. S.; Yavari, R.; Yen, C.-F.; Cheeseman, B. A.

    2015-01-01

    Our recently developed multi-physics computational model for the conventional gas metal arc welding (GMAW) joining process has been upgraded with respect to its predictive capabilities regarding the process optimization for the attainment of maximum ballistic limit within the weld. The original model consists of six modules, each dedicated to handling a specific aspect of the GMAW process, i.e., (a) electro-dynamics of the welding gun; (b) radiation-/convection-controlled heat transfer from the electric arc to the workpiece and mass transfer from the filler metal consumable electrode to the weld; (c) prediction of the temporal evolution and the spatial distribution of thermal and mechanical fields within the weld region during the GMAW joining process; (d) the resulting temporal evolution and spatial distribution of the material microstructure throughout the weld region; (e) spatial distribution of the as-welded material mechanical properties; and (f) spatial distribution of the material ballistic limit. In the present work, the model is upgraded through the introduction of the seventh module in recognition of the fact that identification of the optimum GMAW process parameters relative to the attainment of the maximum ballistic limit within the weld region entails the use of advanced optimization and statistical sensitivity analysis methods and tools. The upgraded GMAW process model is next applied to the case of butt welding of MIL A46100 (a prototypical high-hardness armor-grade martensitic steel) workpieces using filler metal electrodes made of the same material. The predictions of the upgraded GMAW process model pertaining to the spatial distribution of the material microstructure and ballistic limit-controlling mechanical properties within the MIL A46100 butt weld are found to be consistent with general expectations and prior observations.

  14. Remarkable adsorptive removal of nitrogen-containing compounds from a model fuel by a graphene oxide/MIL-101 composite through a combined effect of improved porosity and hydrogen bonding.

    PubMed

    Ahmed, Imteaz; Jhung, Sung Hwa

    2016-08-15

    A composite was prepared by combining a highly porous metal-organic framework (MOF), MIL-101 (Cr-benzenedicarboxylate), and graphene oxide (GnO). The porosity of the composite increased appreciably by the addition of GnO up to a specific amount in the MOF, though further increases in the quantity of GnO was detrimental to porosity. The improved porosity of the GnO/MIL-101 composite was utilized for adsorptive denitrogenation (ADN) of a model fuel where indole (IND) and quinoline (QUI) were used as nitrogen-containing compounds (NCCs). It was found that both IND and QUI showed improved adsorption on the composite compared with pristine MIL-101 or GnO due to the improved porosity of the composite. Interestingly, the improvement in adsorption of IND was much higher than the quantity estimated for the porosity. Importantly, GnO/MIL-101 showed the highest adsorption capacities for NCCs. Irrespective of the studied solvents and co-presence of IND and QUI, the composite adsorbent performed ADN most effectively. This remarkable improvement is explained by the additional mechanism of hydrogen bonding between the surface functional groups of GnO and the hydrogen attached to the nitrogen atom of IND. This hydrogen bonding mechanism is also supported by the results of the adsorption of pyrrole and methylpyrrole. On the other hand, QUI does not show hydrogen-bonding capability, and therefore, its enhanced adsorption originates from only the increased porosity of the adsorbents. PMID:27152881

  15. The 9-MilCA method as a rapid, partly automated protocol for simultaneously recording milk coagulation, curd firming, syneresis, cheese yield, and curd nutrients recovery or whey loss.

    PubMed

    Cipolat-Gotet, C; Cecchinato, A; Stocco, G; Bittante, G

    2016-02-01

    The aim of this study was to propose and test a new laboratory cheesemaking procedure [9-mL milk cheesemaking assessment (9-MilCA)], which records 15 traits related to milk coagulation, curd firming, syneresis, cheese yield, and curd nutrients recovery or whey loss. This procedure involves instruments found in many laboratories (i.e., heaters and lacto-dynamographs), with an easy modification of the sample rack for the insertion of 10-mL glass tubes. Four trials were carried out to test the 9-MilCA procedure. The first trial compared 8 coagulation and curd firming traits obtained using regular or modified sample racks to process milk samples from 60 cows belonging to 5 breeds and 3 farms (480 tests). The obtained patterns exhibited significant but irrelevant between-procedure differences, with better repeatability seen for 9-MilCA. The second trial tested the reproducibility and repeatability of the 7 cheesemaking traits obtained using the 9-MilCA procedure on individual samples from 60 cows tested in duplicate in 2 instruments (232 tests). The method yielded very repeatable outcomes for all 7 tested cheese yield and nutrient recovery traits (repeatability >98%), with the exception of the fresh cheese yield (84%), which was affected by the lower repeatability (67%) of the water retained in the curd. In the third trial (96 tests), we found that using centrifugation in place of curd cooking and draining (as adopted in several published studies) reduced the efficiency of whey separation, overestimated all traits, and worsened the repeatability. The fourth trial compared 9-MilCA with a more complex model cheese-manufacturing process that mimics industry practices, using 1,500-mL milk samples (72 cows, 216 tests). The average results obtained from 9-MilCA were similar to those obtained from the model cheeses, with between-method correlations ranging from 78 to 99%, except for the water retained in the curd (r=54%). Our results indicate that new 9-MilCA method is a powerful research tool that allows the rapid, inexpensive, and partly automated analysis processing 40 samples per day with 2 replicates each, using 1 lacto-dynamograph, 2 heaters, and 3 modified sample racks, and yields a complete picture of the cheesemaking process (e.g., milk gelation, curd firming, syneresis, and whey expulsion) as well as the cheese yield and the efficiency of energy or nutrients retention in the cheese or loss in the whey. PMID:26709175

  16. Synthesis, characterization and sorption properties of functionalized Cr-MIL-101-X (X=-F, -Cl, -Br, -CH3, -C6H4, -F2, -(CH3)2) materials

    NASA Astrophysics Data System (ADS)

    Buragohain, Amlan; Couck, Sarah; Van Der Voort, Pascal; Denayer, Joeri F. M.; Biswas, Shyam

    2016-06-01

    Four existing and three new functionalized chromium terephthalates having MIL-101 topology and denoted as Cr-MIL-101-X (existing ones with X=-F, 1-F; -Cl, 2-Cl; -Br, 3-Br; -CH3, 4-CH3; new ones with X=-C6H4, 5-C6H4; -F2, 6-F2, -(CH3)2, 7-(CH3)2) were synthesized under hydrothermal conditions. All the materials except 5-C6H4 could be prepared by a general synthetic route, in which the mixtures of CrO3, H2BDC-X (BDC=1,4-benzenedicarboxylate) linkers, conc. HCl and water with a molar ratio of 1:1:3.9:222.2 were reacted at 180 °C for 144 h. Compared to the 144 h of synthesis time, three of the compounds, namely 1-Cl, 2-Br and 5-C6H4, could be prepared in much shorter reaction times (12-18 h at 180-210 °C). The materials possess high thermal stability up to 270-300 °C in an air atmosphere. The activated compounds exhibit significant porosity (SBET range: 1273-2135 m2 g-1). At 0 °C and 1 bar, the CO2 adsorption capacities of the compounds fall in the 1.7-2.9 mmol g-1 range. Compounds 1-F and 6-F2 showed enhanced CO2 uptake values compared to parent Cr-MIL-101. The benzene adsorption capacities of the compounds lie in the range of 66.2-139.5 molecules per unit cell at 50 °C and p/p0=0.35. The increased benzene uptake value of 1-F compared to un-functionalized Cr-MIL-101 and 4-CH3 suggests that the fluorination has induced more hydrophobicity in Cr-MIL-101 as compared to the methylation.

  17. Safety Planning for Military (SAFE MIL): rationale, design, and safety considerations of a randomized controlled trial to reduce suicide risk among psychiatric inpatients.

    PubMed

    Ghahramanlou-Holloway, Marjan; Brown, Gregory K; Currier, Glenn W; Brenner, Lisa; Knox, Kerry L; Grammer, Geoffrey; Carreno-Ponce, Jaime T; Stanley, Barbara

    2014-09-01

    Mental health related hospitalizations and suicide are both significant public health problems within the United States Department of Defense (DoD). To date, few evidence-based suicide prevention programs have been developed for delivery to military personnel and family members admitted for psychiatric inpatient care due to suicidal self-directed violence. This paper describes the rationale and detailed methodology for a study called Safety Planning for Military (SAFE MIL) which involves a randomized controlled trial (RCT) at the largest military treatment facility in the United States. The purpose of this study is to test the efficacy of a brief, readily accessible, and personalized treatment called the Safety Planning Intervention (Stanley and Brown, 2012). Primary outcomes, measured by blinded assessors at one and six months following psychiatric discharge, include suicide ideation, suicide-related coping, and attitudes toward help seeking. Additionally, given the study's focus on a highly vulnerable patient population, a description of safety considerations for human subjects' participation is provided. Based on this research team's experience, the implementation of an infrastructure in support of RCT research within DoD settings and the processing of regulatory approvals for a clinical trial with high risk suicidal patients are expected to take up to 18-24 months. Recommendations for expediting the advancement of clinical trials research within the DoD are provided in order to maximize cost efficacy and minimize the research to practice gap. PMID:25020008

  18. Fuel characteristics pertinent to the design of aircraft fuel systems, Supplement I : additional information on MIL-F-7914(AER) grade JP-5 fuel and several fuel oils

    NASA Technical Reports Server (NTRS)

    Barnett, Henry C; Hibbard, Robert R

    1953-01-01

    Since the release of the first NACA publication on fuel characteristics pertinent to the design of aircraft fuel systems (NACA-RM-E53A21), additional information has become available on MIL-F7914(AER) grade JP-5 fuel and several of the current grades of fuel oils. In order to make this information available to fuel-system designers as quickly as possible, the present report has been prepared as a supplement to NACA-RM-E53A21. Although JP-5 fuel is of greater interest in current fuel-system problems than the fuel oils, the available data are not as extensive. It is believed, however, that the limited data on JP-5 are sufficient to indicate the variations in stocks that the designer must consider under a given fuel specification. The methods used in the preparation and extrapolation of data presented in the tables and figures of this supplement are the same as those used in NACA-RM-E53A21.

  19. Performance-Oriented Packaging testing of the Unit load (MIL-STD-1322-108) for the 8 Pack of Task A Assemblies (Packing group 11) solid hazardous materials

    SciTech Connect

    Dwyer, J.M.

    1992-06-01

    This Performance Oriented Packaging (POP) test was conducted to ascertain whether the Unit Load (MIL-STD1 322-1 08) for the 8 Pack of Task A Assemblies (Packing Group 11) meets the requirements specified by the United Nations Recommendation on the Transportation of Dangerous Goods Document, ST/SG/AC.10/1, Revision 6, Chapters 4 and 9 and the Code of Federal Regulations, Title 49 CFR, Parts 1 07 through 1 78, dated 1 October 1 99 1. The unit load's contents consisted of a simulated Task A 8-pack assembly weighing 246 kg (544 pounds), and an additional 21 kg (48 pounds) of weight. Gross weight of the unit load was 346 kg (763 pounds). The test results indicate that the unit load has conformed to the POP requirements. POP Test of the Unit Load (MIL-STD-1 322-108) for the 8 Pack of Task A Assemblies.

  20. Synthesis and crystal structure of a new MOF-type indium pyromellitate (MIL-117) with infinite chains of unusual cis connection of octahedra InO 4(OH) 2

    NASA Astrophysics Data System (ADS)

    Mazaj, Matjaz; Volkringer, Christophe; Loiseau, Thierry; Kaučič, Venčeslav; Férey, Gérard

    2011-08-01

    A new MOF-type indium pyromellitate (MIL-117) was hydrothermally synthesized at 483 K for 24 h. The structure of MIL-117 with structural formula In 6(OH) 6(btec) 3(H 4btec)·8-14H 2O (btec = 1,2,4,5-benzenetetracarboxylate), orthorhombic ( Pnmm) symmetry and unit cell parameters a = 8.2390(8), b = 22.251(2), c = 37.791(4) Å, V = 6928.2(11) Å 3 was solved from single-crystal diffraction data. The three-dimensional open framework structure consists of infinite chains of unusual cis sharing In-centered octahedra linked to each other through the pyromellitate ligands. The three distinct In(III) cations are coordinated to four oxygen atoms from carboxyl groups and two μ 2-hydroxyl groups in cis positions. The MIL-117 network delimits one-dimensional channels of 7.7 × 8.0 Å running along the a axis, where occluded water molecules are located. Although water species can be easily removed from the pore, no significant N 2 or CO 2 sorption was observed.

  1. A new indium metal-organic 3D framework with 1,3,5-benzenetricarboxylate, MIL-96 (In), containing {mu} {sub 3}-oxo-centered trinuclear units and a hexagonal 18-ring network

    SciTech Connect

    Volkringer, Christophe; Loiseau, Thierry . E-mail: loiseau@chimie.uvsq.fr

    2006-05-25

    A new indium trimesate In{sub 12}O(OH){sub 12}({l_brace}OH{r_brace}{sub 4},{l_brace}H{sub 2}O{r_brace}{sub 5})[btc]{sub 6}.{approx}31H{sub 2}O, called MIL-96 (btc = 1,3,5-benzenetricarboxylate or trimesate species) was hydrothermally synthesized under mild condition (210 deg. C, 5 h) in the presence of trimethyl 1,3,5-benzenetricarboxylate in water and characterized by single-crystal X-ray diffraction technique. The MIL-96 (In) structure exhibits a three-dimensional metal-organic framework containing isolated trinuclear {mu} {sub 3}-oxo-bridged indium clusters and infinite chains of InO{sub 4}(OH){sub 2} and InO{sub 2}(OH){sub 3}(H{sub 2}O) octahedra generating a hexagonal network based on 18-membered ring. The two types of indium entities are connected to each other through the trimesate species which induce corrugated chains of indium octahedra, linked via {mu} {sub 2}-hydroxo bonds with the specific -cis-cis-trans- sequence. The 3D framework of MIL-96 reveals three kind of cavities (two of them have estimated {approx} 400 A{sup 3} volumes), in which are encapsulated free water molecules. The latter species are removed upon heating at 150 deg. C.

  2. A combined experimental/computational study on metal-organic framework MIL-101(Cr) as a SPE sorbent for the determination of sulphonamides in environmental water samples coupling with UPLC-MS/MS.

    PubMed

    Dai, Xinpeng; Jia, Xiuna; Zhao, Pan; Wang, Ting; Wang, Jian; Huang, Peiting; He, Lu; Hou, Xiaohong

    2016-07-01

    As a novel kind of materials, metal-organic frameworks (MOFs) have great potential for the preconcentration of trace analytes. In our work, MIL-101(Cr) was prepared and applied as a solid phase extraction (SPE) sorbent for the pretreatment of sulfadiazine (SDA), sulfamethazine (SMZ), sulfachloropyridazine (SCP) and sulfamethoxazole (SMX) in different environmental water samples coupling with ultra-high performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) detection. Experimental parameters, such as SPE materials, pH of water sample, volume of sample, flow rate, and type and volume of elution solvent, were properly optimized. Under the optimum conditions, good sensitivity levels were achieved with the detection limits of 0.03-0.08μg/L and the quantitation limits of 0.11-0.27μg/L. The linear ranges were from 0.2-40 or 0.5-100μg/L (r(2)>0.996) for the analytes, and the relative recoveries were in the range from 83.5% to 107.3% with the relative standard deviations (RSD) between 0.2% and 8.0% (n=6). In addition, computational simulation was primarily used to predict the adsorption of MIL-101(Cr) toward sulphonamides (SAs), and also demonstrated the molecular interactions and free binding energies with the molecular modeling method. The results revealed that the combination of experimental and computational study not only accurately recognized the adsorption of MIL-101(Cr) on SAs, but also provided a new strategy on the trace contaminant analysis. PMID:27154718

  3. An advanced approach for measuring acidity of hydroxyls in confined space: a FTIR study of low-temperature CO and (15)N2 adsorption on MOF samples from the MIL-53(Al) series.

    PubMed

    Mihaylov, M; Andonova, S; Chakarova, K; Vimont, A; Ivanova, E; Drenchev, N; Hadjiivanov, K

    2015-10-01

    Acidity of solids is decisive for their interaction with guest molecules. One of the most used methods for measuring the acidity of surface hydroxyl groups is the hydrogen bond method based on the spectral shift of the OH stretching modes induced by the adsorption of weak bases. However, many materials of practical interest (e.g. metal organic frameworks, zeolites, etc.) are porous and the OH groups are involved in H-bonding with framework basic sites. Here we show that MIL-53(Al) and NH2-MIL-53(Al) samples are characterized by one type of structural hydroxyl but three IR bands are detected at 100 K with these materials (at 3721, 3711 and 3683 cm(-1)). These bands are assigned to structural hydroxyls involved in H-bonding with different strengths. There is no correlation between the acidities of the hydroxyls, as measured by low-temperature CO or (15)N2 adsorption, and the main reason for this is the pre-existing H-bond. A method for the estimation of the intrinsic frequency of the OH groups (i.e. if not participating in H-bonds), based on the analysis of the spectral data obtained with two molecular probes, is proposed. According to this method, the OH stretching frequency of the structural hydroxyls of MIL-53(Al) samples is determined to be 3727 cm(-1). The formation of 1 : 1 adducts between the hydroxyls and strong bases leads to breaking of the pre-existing H-bonds. When the base is weak, bifurcated complexes are formed which slightly affects the spectral shift. The conclusions derived here considerably broaden the applicability of the H-bond method for assessing protonic acidity of materials and systems where the OH groups are preliminarily involved in H-bonding. PMID:26325096

  4. Synthesis and structure determination of new open-framework chromium carboxylate MIL-105 or Cr{sup III}(OH).{l_brace}O{sub 2}C-C{sub 6}(CH{sub 3}){sub 4}-CO{sub 2}{r_brace}.nH{sub 2}O

    SciTech Connect

    Serre, Christian . E-mail: serre@chimie.uvsq.fr; Millange, Franck; Devic, Thomas; Audebrand, Nathalie; Van Beek, Wouter

    2006-08-10

    Two new three-dimensional chromium(III) dicarboxylate, MIL-105 or Cr{sup III}(OH).{l_brace}O{sub 2}C-C{sub 6}(CH{sub 3}){sub 4}-CO{sub 2}{r_brace}.nH{sub 2}O, have been obtained under hydrothermal conditions, and their structures solved using X-ray powder diffraction data. Both solids are structural analogs of the known Cr benzenedicarboxylate compound (MIL-53). Both contain trans corner-sharing CrO{sub 4}(OH){sub 2} octahedral chains connected by tetramethylterephthalate di-anions. Each chain is linked by the ligands to four other chains to form a three-dimensional framework with an array of 1D pores channels. The pores of the high temperature form of the solid, MIL-105ht, are empty. However, MIL-105ht re-hydrates at room temperature to finally give MIL-105lt with pores channels filled with free water molecules (lt: low temperature form; ht: high temperature form). The thermal behaviour of the two solids has been investigated using TGA. Crystal data for MIL-105ht: monoclinic space group C2/c with a = 19.653(1) A, b = 9.984(1) A, c = 6.970(1) A, {beta} = 110.67(1){sup o} and Z = 4. Crystal data for MIL-105lt: orthorhombic space group Pnam with a = 17.892(1) A, b = 11.165(1) A, c = 6.916(1) A and Z = 4.

  5. Evaluation of multilayer printed wiring boards by metallographic techniques: An illustrated guide to the preparation and inspection of plated-through hole test coupons based on the requirements of Mil-P-55110D

    NASA Technical Reports Server (NTRS)

    Jellison, J.

    1986-01-01

    This work is an illustrated handbook containing the rationale and procedure for the evaluation of multilayer printed wiring board construction integrity with respect to plated-through holes in accordance with the requirements of MIL-P-55110D, Printed Wiring Boards. It is intended as a practical aid for those concerned with determining the construction integrity of multilayer boards for high reliability applications. Photomicrographs of cross sectioned holes illustrate defect types, acceptable and unacceptable conditions, and methods of measurement. A procedure for specimen preparation is given, and appropriate paragraphs of the military specification are included and explained.

  6. Comparison of the Combustion Performance of Shell UMF, Grade C, MIL-F-5624C, Grade JP-5, Fuels in a Heavy-Duty XRJ47-W-9 Ram-Jet Engine

    NASA Technical Reports Server (NTRS)

    Ranscht, W. G.; Farley, J. M.

    1957-01-01

    Comparable combustion performance data for Shell UMF, grade C, and MIL-F-5624C, grade JP-5, fuels were obtained using a heavy-duty version of the XRJ47-W-9 ram-jet engine operated in a 2.75 Mach number free-jet facility. Data were obtained for the two fuels over a range of fuel-air ratios, engine airflows, and engine-inlet temperatures. The test conditions were selected to provide combustor-inlet temperatures. The test conditions were selected to provide combustor-inlet conditions approximately representative of those which would be encountered over a range of altitudes and flight Mach numbers. The variation of combustion efficiency with fuel-air ratio for the two fuels is compared at the several inlet conditions. The pilot-burner ignition and operating limits with both fuels are also included. In general, the combustion efficiency with Shell UMF, grade C, fuel was 1 to 4 points lower than with MIL-F-5624C, grade JP-5, fuel.

  7. The metal-organic framework MIL-101(Cr) as efficient adsorbent in a vortex-assisted dispersive solid-phase extraction of imatinib mesylate in rat plasma coupled with ultra-performance liquid chromatography/mass spectrometry: Application to a pharmacokinetic study.

    PubMed

    Qi, Chao; Cai, Qianqian; Zhao, Pan; Jia, Xiuna; Lu, Nan; He, Lu; Hou, Xiaohong

    2016-06-01

    Metal-organic framework MIL-101(Cr) was successfully used as an efficient sorbent in a vortex-assisted dispersive solid-phase extraction (VA-DSPE) and applied for the determination and the pharmacokinetic of imatinib mesylate in rat plasma by UPLC-MS/MS. In the enrichment of imatinib from rat plasma, the analyte was efficiently adsorbed on MIL-101(Cr) and simply recovered by using initial mobile phase (0.1% formic acid-methanol (6:4 v/v)) as elution solvent. Meanwhile, the protein in the plasma samples was excluded from the porous structure of MIL-101(Cr), leading to direct extraction of drug molecule from protein-rich biological samples without any other pretreatment procedure. After being removed, the supernatant was filtered and directly injected into the UPLC-MS/MS for the analysis of the target. The experimental parameters, including nature of MOFs, amount of MIL-101(Cr), pH value of aqueous solution, extraction time, type and volume of elution solvent, were systematically optimized. After VA-DSPE, chromatographic separation was performed on an ACQUITY UPLC(®) BEH C18 column (2.1mm×100mm, 1.7μm) with a 3min gradient elution using 0.1% formic acid and methanol as mobile phase at a flow rate of 0.3mL/min. The detection was accomplished on a tandem mass spectrometer via an electrospray ionization (ESI) source by multiple reaction monitoring (MRM) in the positive ionization mode. The lower limit of quantification of 1ng/mL was achieved and the mean recovery of the analyte was higher than 81.2%. Moreover, computational simulation was primarily applied to predict the adsorption behavior and revealed the molecular interactions and free binding energies between MIL-101(Cr) and imatinib with the molecular modeling method, providing certain explanation of the adsorption mechanism. The originally established pretreatment and detection method has some merits, such as less solvent consumption, easy operation, higher sensitivity and lower matrix effect. And the MIL-101(Cr) exhibited a potential as an efficient sorbent in the enrichment of the analyte from complex biosamples. PMID:27139217

  8. Occurrence of alternatively spliced leader-delta onc-poly(A) transcripts in chicken neuroretina cells infected with Rous-associated virus type 1: implication in transduction of the c-mil/c-raf and c-Rmil/B-raf oncogenes.

    PubMed Central

    Felder, M P; Laugier, D; Eychene, A; Calothy, G; Marx, M

    1993-01-01

    We previously reported that serial passaging of Rous-associated virus type 1 in nondividing chicken embryo neuroretina cells leads to reproducible generation of acutely mitogenic retroviruses that transduced the catalytic domain of c-mil/c-raf or c-Rmil/B-raf. On the basis of structural analysis of several retroviruses, we proposed that the early step of oncogene transduction is the constitution of alternatively spliced leader-delta onc-poly(A) transcripts. Here, we show that neuroretina cells do synthesize hybrid leader-delta mil and leader-delta Rmil RNAs and that these RNAs exhibit mitogenic properties and serve as templates for the generation of transducing retorviruses. Images PMID:8411388

  9. Hydrothermal Synthesis, Structure, and Magnetic Characterization of a New Ferrimagnetic Open Framework Phosphate: MIL-21 or [Fe III5- xV IIIx(H 2PO 4) 4(HPO 4) 4F 4(H 2O) 2, 4(H 2+ yN-(CH 2) 2-NH 2+ y)] with a Partial Cationic Disorder

    NASA Astrophysics Data System (ADS)

    Riou-Cavellec, Myriam; Grenèche, Jean-Marc; Férey, Gérard

    1999-11-01

    MIL-21 or [FeIII5-xVIIIx(H2PO4)4(HPO4)4F4(H2O)2, 4(H2+yN-(CH2)2-NH2+y)] was prepared hydrothermally (453 K, autogenous pressure, 3 days) in the presence of ethylenediamine. Its structure was determined by single-crystal X-ray diffraction. MIL-21 is tetragonal (space group P-421c, No. 114, with cell parameters a=17.2023(2) Å, c=13.3086(2) Å, V=3938.27(9) Å3, Z=4. Its three-dimensional network can be described from the connection via phosphate tetrahedra of infinite corner-sharing cis-trans octahedral chains of metallic atoms in a random distribution and isolated FeO4(H2O)2 octahedra. The (Fe3+, V3+) infinite chains belong to the KTP type. Mössbauer and structure refinements demonstrate this segregation. This structure exhibits small tunnels and cages in which the ethylenediamine molecules are located. Moreover, MIL-21 shows a ferrimagnetic behavior below 13 K.

  10. Electronic Caliper Has 1-mil Accuracy

    NASA Technical Reports Server (NTRS)

    Harrington, Douglas B.; Aragon, Lino A.

    1987-01-01

    New electronic caliper accurate within plus or minus 0.001 in. (0.025 mm) and provides both printout and digital display of thickness. Measurements take less than one-tenth time of mechanical-micrometer measurement. Operator slides probe along rib while measuring thickness between probe tips. Measured value appears on small display in operator's hand as well as on main display unit. Operator orders printout of measurements by pushing switch near thumb.

  11. Synthesis and ab Initio Structure Determination from X-Ray Powder Diffraction of MIL-12, a New Layered Fluoroaluminophosphate Templated with 1,3 Diaminopropane: [N 2C 3H 12]Al 2(PO 4)(OH x, F 5- x) ( x≈2)

    NASA Astrophysics Data System (ADS)

    Simon, N.; Guillou, N.; Loiseau, T.; Taulelle, F.; Férey, G.

    1999-10-01

    MIL-12, formulated Al2(PO4)(OHx, F5-x)N2C3H12, with x≈2, is a new layered fluoroaluminophosphate formed at the early stages of ULM-4 by hydrothermal synthesis using 1-3, Diaminopropane as a template (Al(OH)3/H3PO4/HF/1-3 DAP/H2O:ratio 1 : 1 : 3 : 0.5 : 80, 180°C/2 days). It crystallises in the monoclinic space group P21/m with a=11.072(1) Å, b=7.012 (2) Å, c=6.1096 (8) Å, β=100.98 (1)° and Z=2. Its structure was solved ab initio from conventional X-ray powder diffraction data and refined by the Rietveld method with satisfactory crystal-structure model indicators (RB=0.088 and RF=0.062) and profile factors (Rwp=0.124 and Rp=0.161). It consists of [Al2(PO4)(OH, F)-25] macroanionic sheets perpendicular to the a axis in which OH- and F- ions are statistically distributed. Aluminum octahedra are linked together to form zig-zag chains running parallel to the b axis; the phosphate groups ensure the connection of the aluminum chains within the (100) layer. Protonated 1-3, Diaminopropane is interleaved between the sheets and ensures the cohesion of the structure by hydrogen bonds. Structural relations with other solids built with the same type of chains are presented.

  12. Single-crystal XRD and solid-state NMR structural resolution of a layered fluorinated gallium phosphate: RbGa3(PO4)(2)(HPO4)F4·C5N2H16·2H2O (MIL-145).

    PubMed

    Martineau, Charlotte; Loiseau, Thierry; Beitone, Lionel; Férey, Gérard; Bouchevreau, Boris; Taulelle, Francis

    2013-01-14

    A new two-dimensional fluorinated gallium phosphate RbGa(3)(PO(4))(2)(HPO(4))F(4)·C(5)N(2)H(16)·2H(2)O (MIL-145) has been hydrothermally synthesized (180 °C for 36 h) in the presence of 1,5-diaminopentane and rubidium fluoride. Its structural model has been determined by means of single-crystal X-ray diffraction analysis. The structure contains corrugated infinite ribbons of GaO(3)F(3) and GaO(4)F(2) octahedra linked through edge- and corner-sharing mode via fluoride anions. These chains are then connected to each other via phosphate groups to create a layered network delimiting 6-ring channels trapping rubidium cations. The inorganic sheets are intercalated by diprotonated 1,5-diaminopentane and water molecules, ensuring the three-dimensional cohesion via hydrogen bond scheme. (1)H, (13)C, (15)N and (87)Rb solid-state NMR spectra show the presence of two inequivalent amines as well as two Rb cations, confirming the choice of the space group, which was ambiguous from the diffraction data. (71)Ga NMR spectra, acquired at several magnetic fields, contain two different sets of Ga signals, corresponding to the two types of gallium environments in the structure. One-dimensional (19)F and (31)P and (19)F-(31)P two-dimensional NMR experiments have been recorded, which are in full agreement with the proposed structural model. Finally, possible assignments of the (19)F and (31)P resonances to the crystallographic sites in RbGa(3)(PO(4))(2)(HPO(4))F(4)·C(5)N(2)H(16)·2H(2)O have been determined by comparing adjacency matrices build-up from 2D NMR correlation spectra and from the structural data. PMID:23069866

  13. Which position for MIL-space industry facing QML concept

    NASA Astrophysics Data System (ADS)

    Cuny, P.; Barre, M.

    1991-03-01

    Use of the European Quality Management system EQML by part manufacturers, equipment manufacturers and system users is discussed. Evolution of normalized qualification standards enabling better confidence and cost efficiency in new product generation is discussed. Ways of improving development cycles, yields and product performances using the EQML system are outlined. The main phases involved in the qualification concept are identified.

  14. SAE Mil-1394 For Military and Aerospace Vehicle Applications

    NASA Technical Reports Server (NTRS)

    Dunga, Larry; Wroble, Mike; Kreska, Jack

    2004-01-01

    Unique opportunity to utilize new technology while increasing vehicle and crew member safety. Demonstration of new technology that can be utilized for Crew Exploration Vehicle and other future manned vehicles. Future work for other cameras in the vehicle that can be IEEE1394 based without major vehicle modifications. Demonstrates that LM can share information and knowledge between internal groups and NASA to assist in providing a product in support of the NASA Return to Flight Activities. This upgrade will provide a flight active data bus that is 100 times faster than any similar bus on the vehicle.

  15. Dictionary: Papago/Pima--English, English--Papago/Pima = O'othham--Mil-gahn, Mil-gahn--O'othham.

    ERIC Educational Resources Information Center

    Saxton, Dean; And Others

    Useful for both linguists and laymen because of its scientific validity and accuracy, the second edition of the Papago/Pima-English dictionary gives full definitions for over 5,000 entries. Beginning with a practical alphabet for Papago-Pima and a guide to the dictionary, the book is divided into two parts. In addition to the lexical entries, Part…

  16. Technical publication transfer test with Vitro Corporation: MIL-M-28001 (SGML) and MIL-D-28000 Class 1 (IGES)

    SciTech Connect

    Not Available

    1990-09-18

    The purpose of the informal test reported in this Quick Short Test Reports was to analyze Vitro Corporation's interpretation and use of the CALS standards in transferring technical publications data. Vitro used its CALS Technical Data Interchange System to produce data in accordance with the Standards and delivered it to the CTN technical staff on a 9-track magnetic tape.

  17. Bond-strength studies for 1-mil-diameter gold wires bonded to hybrid microcircuit substrates

    SciTech Connect

    Kan, Y.R.; Prantil, V.C.

    1981-12-01

    Detailed studies of the failure probability for gold wires bonded to multiplexer substrates under severe acceleration in the W79 artillery shell environments were made. The studies included: the calculated resultant pull forces exerted on the bond joints due to the W79 acceleration environments; the suitability of the loop-hook pull tests and the use of the normal Gaussian distribution theory for statistical description of bond strengths; and the probability of failure for gold wires bonded to multiplexer substrates under artillery shell accelerations using fixed angle pull tests and a Weilbull distribution theory for the statistical description. Preliminary statistical analyses of the bond strength data obtained from the conventional loop-hook pull tests for a multiplexer substrate HMC, have shown that the ball bond is strong enough to withstand the 0.17 gram design limit load due to the W79 gun barrel environments with a very low probability of failure. For the wedge bond, however, the results of a statistical analysis for the bond strength agree with experience which shows that the wedge bonds are generally much weaker than ball bonds in multiplexer substrates, and the probability of failure may be high enough to cause a problem. The degradation of the wedge bond strength due to post-assembly testing is significant as indicated by the large increase in probability of failure for the post-assembly-tested wedge bonds. To illustrate this, consider a worst-case example which assumes all wires bonded to the hybrid microcircuit substrates have the same geometry and loading conditions. Assuming the W79 JTA has approximately 2760 of these bonded wires, the probabilities of failure are 0.0179% for virgin wedge bonds and 2.1% for post-assembly-tested wedge bonds.

  18. Correlations in the (Sub)Mil1imeter Background from ACT x BLAST

    NASA Technical Reports Server (NTRS)

    Hajian, Amir; Battaglia,Nick; Bock, James J.; Bond, J. Richard; Nolta, Michael R.; Sievers, Jon; Wollack, Ed

    2011-01-01

    We present measurements of the auto- and cross-frequency correlation power spectra of the cosmic (sub)millimeter background at: 250, 350, and 500 microns (1200, 860, and 600 GHz) from observations made with the Balloon-borne Large Aperture Submillimeter Telescope, BLAST; and at 1380 and 2030 microns (218 and 148 GHz) from observations made with the Atacama Cosmology Telescope, ACT. The overlapping observations cover 8.6 deg(sup 2) in an area relatively free of Galactic dust near the south ecliptic pole (SEP). The ACT bands are sensitive to radiation from the CMB, the Sunyaev-Zel'dovich (SZ) effect from galaxy clusters, and to emission by radio and dusty star-forming galaxies (DSFGs), while the dominant contribution to the BLAST bands is from DSFGs. We confirm and extend the BLAST analysis of clustering with an independent pipeline, and also detect correlations between the ACT and BLAST maps at over 25(sigma) significance, which we interpret as a detection of the DSFGs in the ACT maps. In addition to a Poisson component in the cross-frequency power spectra, we detect a clustered signal at 4(sigma), and using a model for the DSFG evolution and number counts, we successfully fit all our spectra with a linear clustering model and a bias that depends only on red shift and not on scale. Finally, the data are compared to, and generally agree with, phenomenological models for the DSFG population. This study represents a first of its kind, and demonstrates the constraining power of the cross-frequency correlation technique to constrain models for the DSFGs. Similar analyses with more data will impose tight constraints 011 future models.

  19. Effect of hydraulic fluid (MIL-H-83282) on selected commercial O-ring compounds

    NASA Technical Reports Server (NTRS)

    Wood, T. E.; Stone, W. P.

    1978-01-01

    Acrylonitrile and fluorocarbon compounds were evaluated at various temperatures and time intervals in samples of the fluid obtained from three qualified suppliers. It was concluded that both polymers can function in hydraulic fluids within the conditions defined by this study. Hydraulic fluid from each manufacturer was similar in its effect upon each given O-ring material, with one exception. Similarly, there were no striking differences in the resistance of O-rings of the same generic rubber type when provided by the different manufacturers.

  20. MISR Level 2 TOA/Cloud Classifier parameters (MIL2TCCL_V3)

    NASA Technical Reports Server (NTRS)

    Diner, David J. (Principal Investigator)

    The TOA/Cloud Classifiers contain the Angular Signature Cloud Mask (ASCM), a scene classifier calculated using support vector machine technology (SVM) both of which are on a 1.1 km grid, and cloud fractions at 17.6 km resolution that are available in different height bins (low, middle, high) and are also calculated on an angle-by-angle basis. [Temporal_Coverage: Start_Date=2000-02-24; Stop_Date=] [Spatial_Coverage: Southernmost_Latitude=-90; Northernmost_Latitude=90; Westernmost_Longitude=-180; Easternmost_Longitude=180] [Data_Resolution: Latitude_Resolution=1.1 km; Longitude_Resolution=1.1 km; Temporal_Resolution=about 15 orbits/day].

  1. MISR Level 2 TOA/Cloud Classifier parameters (MIL2TCCL_V2)

    NASA Technical Reports Server (NTRS)

    Diner, David J. (Principal Investigator)

    The TOA/Cloud Classifiers contain the Angular Signature Cloud Mask (ASCM), a scene classifier calculated using support vector machine technology (SVM) both of which are on a 1.1 km grid, and cloud fractions at 17.6 km resolution that are available in different height bins (low, middle, high) and are also calculated on an angle-by-angle basis. [Location=GLOBAL] [Temporal_Coverage: Start_Date=2000-02-24; Stop_Date=] [Spatial_Coverage: Southernmost_Latitude=-90; Northernmost_Latitude=90; Westernmost_Longitude=-180; Easternmost_Longitude=180] [Data_Resolution: Latitude_Resolution=17.6 km; Longitude_Resolution=17.6 km; Horizontal_Resolution_Range=10 km - < 50 km or approximately .09 degree - < .5 degree; Temporal_Resolution=about 15 orbits/day; Temporal_Resolution_Range=Daily - < Weekly, Daily - < Weekly].

  2. Computerised emission and susceptibility MIL.STD testing with automated NB/BB detection

    NASA Astrophysics Data System (ADS)

    Vanessen, J. C.

    1990-09-01

    Automation of Electromagnetic Compatibility (EMC) testing is becoming common at many EMC test facilities. Commercial automated systems have become available in the past few years. The test and operations section has developed its own EMC automation to enhance and aid in testing. A complete overview of the automated EMC test facility in operation for emission and susceptibility measurements is presented. It includes a hardware description, the program structure and some of the methods required to complete such a program on the equipment chosen, including the Narrow Band (NB) and Broad Band (BB).

  3. The Impact Of MIL-STD-2179 ("SMPTE") On Recording Reconnaissance Data

    NASA Astrophysics Data System (ADS)

    Kessler, William D.

    1988-02-01

    State of the art reconnaissance systems require and are "birthing" a new family of high data rate, high capacity, cassette magnetic tape recorder/reproducers. Standards delineating the requirements to guarantee the successful interchange of recorded tapes between recorders in different locations and of different manufacturers are being formulated. This paper considers these standards and their impact on the magnetic tape recorder/reproducers, and therefore on some aspects of the reconnaissance system.

  4. Alternative techniques for some typical MIL-STD-461/462 types of measurements

    NASA Astrophysics Data System (ADS)

    Cruz, J. E.; Larsen, E. B.

    1989-03-01

    Antenna factors determined in a screenroom which was partially loaded with radio frequency (RF) absorbing material, using the two antenna insertion loss technique, are presented. These antenna factors are compared with the antenna factors obtained in an unloaded screenroom, a fully loaded screenroom (anechoic chamber), and at an open field site. In addition, measurements at the 8 corners of a cube were made in partially loaded and fully loaded screenroom to determine the field deviation at the 8 corners of the cube with respect to its center. Also, measurement improvements are quantified for the electric field strength beneath a single wire transmission line, in a partially loaded screenroom. Finally, electric field measurements were made on top of the grounded table in a partially loaded screenroom to determine the field strength variation above the table.

  5. Dual-rate MIL-STD-1773 fiber optic transceiver for satellite applications

    NASA Astrophysics Data System (ADS)

    Thelen, Donald C., Jr.; Rankin, Stephen L.; Marshall, Paul W.; LaBel, Kenneth A.; Krainak, Michael A.

    1994-06-01

    A dual rate 1773 fiber optic transceiver chip for space applications is presented. The transceiver will work with either 1 Mbps, or 20 Mbps Manchester data. The receiver features first bit capture with no preamble for 1 Mbps data, and clock recovery for 20 Mbps data. Single event effects in the photo diode are considered in the receiver design. A transmitter switch is included on the chip for driving an LED. The chip will be fabricated in a radiation hard CMOS process.

  6. Single chip MIL-STD-1553B bus interface unit keeps pace with chip sets

    NASA Astrophysics Data System (ADS)

    Schaire, S.

    1982-11-01

    The introduction of chip sets for multiplex terminal designs that provide savings in hardware and software may leave the designer confused as to which chip set to use for a particular application. The Grumman/Standard Microsystem Corp. (SMC) Bus Interface Unit (BIU) is compared to other BIUs in terms of capabilities and amount of peripheral chips required. It is shown that the single-chip Grumman/SMC BIU performs similar functions of the other chip set BIUs at a lower cost.

  7. UARS MILS O3 soundings compared with lidar measurements using the conservative coordinates reconstruction technique

    NASA Technical Reports Server (NTRS)

    Redaelli, G.; Lait, L. R.; Schoeberl, M.; Newman, P. A.; Visconti, G.; D'Altorio, A.; Masci, F.; Rizi, V.; Froidevaux, L.; Waters, J. W.

    1994-01-01

    A technique based on conservative properties of certain meteorological fields is used to compare ozone measurements from the Microwave Limb Sounder (MLS) on the Upper Atmosphere Research Satellite (UARS) with soundings from a lidar system operated at midlatitudes by the University of L'Aquila, Italy. A few typical cases are analyzed in connection with the position of the vortex relative to the observing station, and it is shown that in general lidar observations taken within the vortex compare well with the UARS data, regardless of whether they are coincident with a satellite overpass. It is shown that such analysis may be useful for comparing measurements of the same quantity taken at different sites using different measurement techniques.

  8. Constructing Free Standing Metal Organic Framework MIL-53 Membrane Based on Anodized Aluminum Oxide Precursor

    PubMed Central

    Zhang, Yunlu; Gao, Qiuming; Lin, Zhi; Zhang, Tao; Xu, Jiandong; Tan, Yanli; Tian, Weiqian; Jiang, Lei

    2014-01-01

    Metal organic framework (MOF) materials have attracted great attention due to their well-ordered and controllable pores possessing of prominent potentials for gas molecule sorption and separation performances. Organizing the MOF crystals to a continuous membrane with a certain scale will better exhibit their prominent potentials. Reports in recent years concentrate on well grown MOF membranes on specific substrates. Free standing MOF membranes could have more important applications since they are independent from the substrates. However, the method to prepare such a membrane has been a great challenge because good mechanical properties and stabilities are highly required. Here, we demonstrate a novel and facile technique for preparing the free standing membrane with a size as large as centimeter scale. The substrate we use proved itself not only a good skeleton but also an excellent precursor to fulfill the reaction. This kind of membrane owns a strong mechanical strength, based on the fact that it is much thinner than the composite membranes grown on substrates and it could exhibit good property of gas separation. PMID:24821299

  9. MISR Level 1A CCD Science data, all cameras (MIL1A_V1)

    NASA Technical Reports Server (NTRS)

    Diner, David J. (Principal Investigator)

    The Level 1A data are raw MISR data that are decommutated, reformatted 12-bit Level 0 data shifted to byte boundaries, i.e., reversal of square-root encoding applied and converted to 16 bit, and annotated (e.g., with time information). These data are used by the Level 1B1 processing algorithm to generate calibrated radiances. The science data output preserves the spatial sampling rate of the Level 0 raw MISR CCD science data. CCD data are collected during routine science observations of the sunlit portion of the Earth. Each product represents one 'granule' of data. A 'granule' is defined to be the smallest unit of data required for MISR processing. Also, included in the Level 1A product are pointers to calibration coefficient files provided for Level 1B processing. [Location=GLOBAL] [Temporal_Coverage: Start_Date=2000-02-24; Stop_Date=] [Spatial_Coverage: Southernmost_Latitude=-90; Northernmost_Latitude=90; Westernmost_Longitude=-180; Easternmost_Longitude=180].

  10. MISR Level 1A CCD Science data, all cameras (MIL1A_V2)

    NASA Technical Reports Server (NTRS)

    Diner, David J. (Principal Investigator)

    The Level 1A data are raw MISR data that are decommutated, reformatted 12-bit Level 0 data shifted to byte boundaries, i.e., reversal of square-root encoding applied and converted to 16 bit, and annotated (e.g., with time information). These data are used by the Level 1B1 processing algorithm to generate calibrated radiances. The science data output preserves the spatial sampling rate of the Level 0 raw MISR CCD science data. CCD data are collected during routine science observations of the sunlit portion of the Earth. Each product represents one 'granule' of data. A 'granule' is defined to be the smallest unit of data required for MISR processing. Also, included in the Level 1A product are pointers to calibration coefficient files provided for Level 1B processing. [Location=GLOBAL] [Temporal_Coverage: Start_Date=2000-02-24; Stop_Date=] [Spatial_Coverage: Southernmost_Latitude=-90; Northernmost_Latitude=90; Westernmost_Longitude=-180; Easternmost_Longitude=180].

  11. A polled contention multiplex system using MIL-STD-1553 protocol

    NASA Astrophysics Data System (ADS)

    Wilson, D. H.

    The polled contention mode in the Avionic Multiplex System is discussed, and a technique to pass the bus controller function between the terminals based on the activity of input data is presented. Improvements such as decreased data latency, more efficient bus utilization, and simplicity in software implementation are reviewed, and associated problems are considered. It is concluded that the use of dynamic bus allocation will have increasing significance as future systems become larger and more complex, while the polled contention mode may be a viable alternative to the command response system.

  12. Electrostatic bonding of thin (cycle sine 3 mil) 7070 cover glass to Ta2O5 AR-coated thin (cycle sine 2 mil) silicon wafers and solar cells

    NASA Technical Reports Server (NTRS)

    Egelkrout, D. W.

    1981-01-01

    Electrostatic bonding of thin cover glass to thin solar cells was researched. Silicon solar cells, wafers, and Corning 7070 glass of from about 0.002" to about 0.003" in thickness were used in the investigation to establish optimum parameters for producing mechanically acceptable bonds while minimizing thermal stresses and resultant solar cell electrical parameter degradation.

  13. Mission-oriented requirements for updating MIL-H-8501. Volume 2: STI background and rationale. [military rotorcraft

    NASA Technical Reports Server (NTRS)

    Clement, W. F.; Hoh, R. H.; Mitchell, D. G.; Ferguson, S. W., III

    1985-01-01

    A supplement to the structure of a new flying and ground handling qualities specification for military rotorcraft structure is presented in order to explain the background and rationale for the specification structure, the proposed forms of criteria, and the status of the existing data base. Critical gaps in the data base for the new structure are defined, and recommendations are provided for the research required to address the most important of these gaps.

  14. Engineering data transfer test with EDCARS using MIL-R-28002 (Raster). Laboratory Acceptance Test and User Application Test

    SciTech Connect

    Not Available

    1992-04-17

    This paper documents the results of a sequence of tests conducted to evaluate the DoD Computer-aided Acquisition and Logistic Support (CALS) data interchange capability of the Air Force Engineering Data Computer-Assisted Retrieval System (EDCARS). The CALS initiative specifies a standard digital interface to streamline the interchange of technical data between the DoD and the commercial sector. The CALS Test Network (CTN) is tasked to conduct tests of military standards which specify this digital interface. The testing results outlined in this report are intended to evaluate the EDCARS systems`s ability to sport CALS data interchanges and establish the level of technical data interoperability implemented at this DoD engineering data repository.

  15. A theory of electromagnetic shielding with applications to MIL-STD-285, IEEE-299, and EMP simulation

    NASA Astrophysics Data System (ADS)

    Monroe, R. L.

    1985-02-01

    A shielding theory based on Impedance Boundary Conditions is developed and used to obtain formal expressions for the fields transmitted to the interior of a generalized metallic structure from an arbitrary, external, time harmonic, electromagnetic source. The structure is an assemblage of planar sheets that may be penetrated by a finite number of narrow rectangular slots. It includes both a single sheet (continuous or slotted) and a rectangular enclosure (continuous or slotted) as special cases. Explicit expressions are then derived for the transmitted electric and magnetic fields at points on the inside surfaces of plane sheets (continuous and slotted) and rectangular enclosures (continuous and slotted) when these structures are exposed to fields from elementary electric and magnetic dipoles and small rectangular loop antennas. These expressions are then used to obtain the shielding effectiveness of sheets and enclosures.

  16. Ruggedized minicomputer hardware and software topics, 1981: Proceedings of the 4th ROLM MIL-SPEC Computer User's Group Conference

    NASA Technical Reports Server (NTRS)

    1981-01-01

    Presentations of a conference on the use of ruggedized minicomputers are summarized. The following topics are discussed: (1) the role of minicomputers in the development and/or certification of commercial or military airplanes in both the United States and Europe; (2) generalized software error detection techniques; (3) real time software development tools; (4) a redundancy management research tool for aircraft navigation/flight control sensors; (5) extended memory management techniques using a high order language; and (6) some comments on establishing a system maintenance scheme. Copies of presentation slides are also included.

  17. Extending the granularity of representation and control for the MIL-STD CAIS 1.0 node model

    NASA Technical Reports Server (NTRS)

    Rogers, Kathy L.

    1986-01-01

    The Common APSE (Ada 1 Program Support Environment) Interface Set (CAIS) (DoD85) node model provides an excellent baseline for interfaces in a single-host development environment. To encompass the entire spectrum of computing, however, the CAIS model should be extended in four areas. It should provide the interface between the engineering workstation and the host system throughout the entire lifecycle of the system. It should provide a basis for communication and integration functions needed by distributed host environments. It should provide common interfaces for communications mechanisms to and among target processors. It should provide facilities for integration, validation, and verification of test beds extending to distributed systems on geographically separate processors with heterogeneous instruction set architectures (ISAS). Additions to the PROCESS NODE model to extend the CAIS into these four areas are proposed.

  18. Improving the hydrogen-adsorption properties of a hydroxy-modified MIL-53(Al) structural analogue by lithium doping.

    PubMed

    Himsl, Dieter; Wallacher, Dirk; Hartmann, Martin

    2009-01-01

    Lithium makes the difference: A simple strategy for the synthesis of lithium-doped porous metal-organic frameworks (MOFs) is developed (see structure; C black, O red, AlO(6) blue octahedra), thus paving the way for the facile preparation of lithium-doped MOFs. Moreover, the significant increase in hydrogen adsorption predicted by theoretical calculations is observed. PMID:19455533

  19. Polución electromagnética; el símil radioastronómico de la polución lumínica

    NASA Astrophysics Data System (ADS)

    Gancio, G. M.

    2015-08-01

    Technological progress in recent decades in the area of communications have reduced the available radio frequency range. This prompted the reorganization of the radio spectrum in order to reserve some frequencies for astronomical research. In this work the harmful interference to radio astronomy observation is explained, as well as how the monitoring of such interferences and the protection of the radio spectrum for science in Argentina is realized.

  20. Connecting defects and amorphization in UiO-66 and MIL-140 metal-organic frameworks: a combined experimental and computational study.

    PubMed

    Bennett, Thomas D; Todorova, Tanya K; Baxter, Emma F; Reid, David G; Gervais, Christel; Bueken, Bart; Van de Voorde, B; De Vos, Dirk; Keen, David A; Mellot-Draznieks, Caroline

    2016-01-01

    The mechanism and products of the structural collapse of the metal-organic frameworks (MOFs) , and upon ball-milling are investigated through solid state (13)C NMR and pair distribution function (PDF) studies, finding amorphization to proceed by the breaking of a fraction of metal-ligand bonding in each case. The amorphous products contain inorganic-organic bonding motifs reminiscent of the crystalline phases. Whilst the inorganic Zr6O4(OH)4 clusters of remain intact upon structural collapse, the ZrO backbone of the frameworks undergoes substantial distortion. Density functional theory calculations have been performed to investigate defective models of and show, through comparison of calculated and experimental (13)C NMR spectra, that amorphization and defects in the materials are linked. PMID:26689168

  1. Magnetite in Martian Meteorite Mil 03346 and Gusev Adirondack Class Basalt: Moessbauer Evidence for Variability in the Oxidation State of Adirondack Lavas

    NASA Technical Reports Server (NTRS)

    Morris, R. V.; McKay, G. A.; Ming, D. W.; Klingelhoefer, G.; Schroeder, C.; Rodionov, D.; Yen, A.

    2006-01-01

    The Moessbauer spectrometers on the Mars Exploration Rovers Spirit (Gusev crater) and Opportunity (Meridiani Planum) have returned information on the oxidation state of iron, the mineralogical composition of Fe-bearing phases, and the distribution of Fe among oxidation states and phases [1,2,3]. To date, 100 and 85 surface targets have been analyzed by the Spirit and Opportunity spectrometers, respectively. Twelve component subspectra (8 doublets and 4 sextets) have been identified and most have been assigned to mineralogical compositions [4]. Two sextet subspectra result from the opaque and strongly magnetic mineral magnetite (Fe3O4 for the stoichiometric composition), one each for the crystallographic sites occupied by tetrahedrally-coordinated Fe3+ and by octahedrally-coordinated Fe3+ and Fe2+. At Gusev crater, the percentage of total Fe associated with magnetite for rocks ranges from 0 to 35% (Fig. 1) [3]. The range for soils (5 to 12% of total Fe from Mt, with one exception) is narrower. The ubiquitous presence of Mt in soil firmly establishes the phase as the strongly magnetic component in martian soil

  2. Magnetite in Martian Meteorite Mil 03346 and Gusev Adirondack Class Basalt: Mossbauer Evidence for Variability in the Oxidation State of Adirondack Lavas

    NASA Technical Reports Server (NTRS)

    Morris, R. V.; McKay, G. A.; Ming, D. W.; Klingelhoefer, G.; Schroeder, C.; Rodionov, D.; Yen, A.

    2006-01-01

    The Moessbauer spectrometers on the Mars Exploration Rovers Spirit (Gusev crater) and Opportunity (Meridiani Planum) have returned information on the oxidation state of iron, the mineralogical composition of Fe-bearing phases, and the distribution of Fe among oxidation states and phases [1,2,3]. To date, approx.100 and approx.85 surface targets have been analyzed by the Spirit and Opportunity spectrometers, respectively. Twelve component subspectra (8 doublets and 4 sextets) have been identified and most have been assigned to mineralogical compositions [4]. Two sextet subspectra result from the opaque and strongly magnetic mineral magnetite (Fe3O4 for the stoichiometric composition), one each for the crystallographic sites occupied by tetrahedrally-coordinated Fe3+ and by octahedrally-coordinated Fe3+ and Fe2+. At Gusev crater, the percentage of total Fe associated with magnetite for rocks ranges from 0 to approx. 35% (Fig. 1) [3]. The range for soils (approx.5 to approx.12% of total Fe from Mt, with one exception) is narrower. The ubiquitous presence of Mt in soil firmly establishes the phase as the strongly magnetic component in martian soil [4,5].

  3. MOF derived composites for cathode protection: coatings of LiCoO2 from UiO-66 and MIL-53 as ultra-stable cathodes.

    PubMed

    Qi, Pengfei; Han, Yuzhen; Zhou, Junwen; Fu, Xiaotao; Li, Siwu; Zhao, Jingshu; Wang, Lu; Fan, Xinxin; Feng, Xiao; Wang, Bo

    2015-08-11

    A mechanochemical synthetic method of preparing LiCoO2 coated by MOF-derived metal oxide composites is introduced. Mono-dispersed ZrO2 and Al2O3 are applied as protection layers. These composites show 148 mA h g(-1) at a current density of 2325 mA g(-1) and excellent thermal stability (55 °C). PMID:26140444

  4. 48 CFR 52.211-2 - Availability of Specifications, Standards, and Data Item Descriptions Listed in the Acquisition...

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... ASSIST websites: (1) ASSIST (http://assist.daps.dla.mil); (2) Quick Search (http://assist.daps.dla.mil... Wizard (http://assist.daps.dla.mil/wizard); (2) Phoning the DoDSSP Customer Service Desk (215)...

  5. 48 CFR 52.211-2 - Availability of Specifications, Standards, and Data Item Descriptions Listed in the Acquisition...

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... ASSIST websites: (1) ASSIST (http://assist.daps.dla.mil); (2) Quick Search (http://assist.daps.dla.mil... Wizard (http://assist.daps.dla.mil/wizard); (2) Phoning the DoDSSP Customer Service Desk (215)...

  6. 48 CFR 52.211-2 - Availability of Specifications, Standards, and Data Item Descriptions Listed in the Acquisition...

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... ASSIST websites: (1) ASSIST (http://assist.daps.dla.mil); (2) Quick Search (http://assist.daps.dla.mil... Wizard (http://assist.daps.dla.mil/wizard); (2) Phoning the DoDSSP Customer Service Desk (215)...

  7. Laser drilling of vias in dielectric for high density multilayer LSHI thick film circuits

    NASA Technical Reports Server (NTRS)

    Cocca, T.; Dakesian, S.

    1977-01-01

    A design analysis of a high density multilevel thick film digital microcircuit used for large scale integration is presented. The circuit employs 4 mil lines, 4 mil spaces and requires 4 mil diameter vias. Present screened and fired thick film technology is limited on a production basis to 16 mil square vias. A process whereby 4 mil diameter vias can be fabricated in production using laser technology was described along with a process to produce 4 mil diameter vias for conductor patterns which have 4 mil lines and 4 mil spacings.

  8. New thick film feedthrough configurations; Final report

    SciTech Connect

    Fritsche, C.T.

    1994-03-01

    An investigation determined that thick film feedthroughs could successfully be printed with 12-mil holes in 20-mil square pads, 10-mil holes in 15-mil square pads, 6 {times} 12-mil oval-shaped holes in 10 {times} 35-mil rectangular pads, and 6 {times} 9-mil oval-shaped holes in 10 {times} 25-mil rectangular pads. The results were verified by printing test vehicles containing the four feedthrough configurations, electrically testing the feedthroughs for continuity, and cross-sectioning each of the feedthroughs in two axes.

  9. Revision of FED-STD-209D and MIL-STD-1246B and development of IES (Institute of Environmental Sciences) contamination control recommended practices in the United States of America

    SciTech Connect

    Mielke, R.L.

    1990-01-01

    In the United States of America, numerous organizations are writing standards and recommend practices for contamination control and cleanroom applications. The American Society for Testing and Materials (ASTM), the Institute of Environmental Sciences (IES), and various US Government agencies are among the organizations with a vested interest in publishing standards and recommended practices on these subjects. In the early years of contamination control and cleanroom technology, significant work was done in the US on standards and recommended practices. Proprietary standards were established by companies and other documents were produced by Federal agencies and technical organizations. In 1982, the IES began to focus on recommended practices, and the US General Services Administration (GSA) commissioned the IES to review and rewrite US Federal Standard 209 (FED-STD-209). The ASTM continues to review and update their standards on cleanroom applications on a periodic basis. Now, in 1990, US military organizations are beginning to review their cleanroom documents as well. This paper will discuss the preparation of IES Recommended Practices and Standards for contamination control and cleanroom applications. It will describe the current status of four IES Recommended Practices and two US Government documents.

  10. Meaning in life and intuition.

    PubMed

    Heintzelman, Samantha J; King, Laura A

    2016-03-01

    Three correlational studies and 2 experiments examined the association between meaning in life (MIL) and reliance on intuitive information processing. In Studies 1-3 (total N = 5,079), Faith in Intuition (FI) scale and MIL were correlated positively, controlling for religiosity, positive mood, self-esteem, basic need satisfaction, and need for cognition. Two experiments manipulated processing style. In Study 4 (N = 614), participants were randomly assigned to complete the Cognitive Reflection Task (CRT; Fredrick, 2005) either immediately before (reflective/low intuitive mindset condition) or immediately after (control condition) rating MIL. Condition did not affect MIL. However, low MIL rated before the CRT predicted superior performance and greater time spent on the task. The association between reflection and MIL was curvilinear, such that MIL was strongly negatively related to CRT performance particularly at low levels of MIL. In Study 5 (N = 804), intuitive or reflective mindsets were induced and FI and MIL were measured. Induced processing style study did not affect MIL. However, those high in MIL were more responsive to the intuitive mindset induction. The relationship between FI and MIL was curvilinear (in this and the correlational studies), with intuitive processing being strongly positively related to MIL particularly at higher levels of MIL. Although often considered in the context of conscious reflection, MIL shares a positive relationship with reliance on gut feelings, and high MIL may facilitate reliance on those feelings. (PsycINFO Database Record PMID:26322984

  11. 46 CFR 160.010-1 - Incorporation by reference.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... Specifications MIL-P-19644 C—Plastic Molding Material (Polystyrene Foam, Expanded Bead). MIL-R-21607 C—Resins, Polyester, Low Pressure Laminating, Fire Retardant. MIL-P-21929 B—Plastic Material, Cellular Polyurethane, Foam-In-Place, Rigid (2 and 4 Pounds per Cubic Foot). MIL-P-40619 A—Plastic Material,...

  12. 46 CFR 160.010-1 - Incorporation by reference.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... Specifications MIL-P-19644 C—Plastic Molding Material (Polystyrene Foam, Expanded Bead). MIL-R-21607 C—Resins, Polyester, Low Pressure Laminating, Fire Retardant. MIL-P-21929 B—Plastic Material, Cellular Polyurethane, Foam-In-Place, Rigid (2 and 4 Pounds per Cubic Foot). MIL-P-40619 A—Plastic Material,...

  13. Establishment of a production-ready manufacturing process utilizing thin silicon substrates for solar cells. Final report. Motorola report No. 2364/4

    SciTech Connect

    Pryor, R. A.

    1980-10-01

    Three inch diameter Czochralski silicon substrates sliced directly to 5 mil, 8 mil, and 27 mil thicknesses with wire saw techniques were procured. Processing sequences incorporating either diffusion or ion implantation technologies were employed to produce n+p or n+pp+ solar cell structures. These cells were evaluated for performance, ease of fabrication, and cost effectiveness. It was determined that the use of 7 mil or even 4 mil wafers would provide near term cost reductions for solar cell manufacturers.

  14. The establishment of a production-ready manufacturing process utilizing thin silicon substrates for solar cells

    NASA Technical Reports Server (NTRS)

    Pryor, R. A.

    1980-01-01

    Three inch diameter Czochralski silicon substrates sliced directly to 5 mil, 8 mil, and 27 mil thicknesses with wire saw techniques were procured. Processing sequences incorporating either diffusion or ion implantation technologies were employed to produce n+p or n+pp+ solar cell structures. These cells were evaluated for performance, ease of fabrication, and cost effectiveness. It was determined that the use of 7 mil or even 4 mil wafers would provide near term cost reductions for solar cell manufacturers.

  15. National Military Family Association

    MedlinePlus

    ... Strengthen the Health of MilFams Are you a military spouse mental health professional? Learn about a new ... Your MilFam! We’re continuing our celebration of military families with a unique giveaway from Fitz Frame! ...

  16. 40 CFR 1033.110 - Emission diagnostics-general requirements.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... may use sound in addition to the light signal. (b) To ensure that owner/operators consider MIL... in paragraph (e) of this section. You may store codes for conditions that do not turn on the MIL....

  17. 46 CFR 160.023-1 - Incorporation by reference.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... specifications MIL-S-18655 C, 3 May 1971Signal, Smoke and Illumination, Marine, Mark 13, Mod 0. (b) The military...: SPECIFICATIONS AND APPROVAL LIFESAVING EQUIPMENT Hand Combination Flare and Smoke Distress Signals ...

  18. 48 CFR 246.706 - Warranty terms and conditions.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... conditions. (b)(5) Markings. For non-commercial items, use MIL-STD-129, Marking for Shipments and Storage, and MIL-STD-130, Identification Marking of U.S. Military Property, when marking warranty items....

  19. 48 CFR 246.706 - Warranty terms and conditions.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... conditions. (b)(5) Markings. For non-commercial items, use MIL-STD-129, Marking for Shipments and Storage, and MIL-STD-130, Identification Marking of U.S. Military Property, when marking warranty items....

  20. 48 CFR 246.706 - Warranty terms and conditions.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... conditions. (b)(5) Markings. For non-commercial items, use MIL-STD-129, Marking for Shipments and Storage, and MIL-STD-130, Identification Marking of U.S. Military Property, when marking warranty items....

  1. 48 CFR 246.706 - Warranty terms and conditions.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... conditions. (b)(5) Markings. For non-commercial items, use MIL-STD-129, Marking for Shipments and Storage, and MIL-STD-130, Identification Marking of U.S. Military Property, when marking warranty items....

  2. 46 CFR 160.062-1 - Applicable specifications, and referenced material.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ..., Hydraulic and Manual § 160.062-1 Applicable specifications, and referenced material. (a) Specifications and...: MIL-R-15041C—Releases, lifesaving equipment, hydraulic and manual. MIL-STD-105—Sample procedures...

  3. 48 CFR 52.204-18 - Commercial and Government Entity Code Maintenance.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... http://www.dlis.dla.mil/Forms/Form_AC135.asp. (e) Additional guidance for maintaining CAGE codes is available at http://www.dlis.dla.mil/cage_welcome.asp. (End of clause) Effective Date Note: At 79 FR...

  4. Recent Developments in Silver/Zinc Rechargeable Cell Studies

    NASA Technical Reports Server (NTRS)

    Lewis, Harlan L.

    2001-01-01

    This viewgraph presentation discusses silver/zinc cell casing configurations and test results examining discharge capacity and silver migration comparisons. The following recommendations were proposed: 1) Use silver-treated cellophane instead of clear cellophane; 2) Use split wrap for cellophane whenever possible; and 3) Strongly consider use of sausage casing with PVA film in the following configuration: 1-mil (tubular) SC/1-mil PVA film/2.3-mil plain or 6-mil fiber-reinforced SC tubular.

  5. New NVIS compatibility standard evaluated

    NASA Astrophysics Data System (ADS)

    Boulter, Bud E.; Bowyer, Rick L.

    2001-09-01

    MIL-L-85762 (Military Specification, Lighting, Aircraft, Interior, Night Vision, Imaging System (NVIS) Compatible) served for over twelve years as the standard definition of Night Vision Imaging System (NVIS) compatibility. MIL-STD- 3009 (Department of Defense Interface Standard for Lighting, Aircraft, Interior, Night Vision, Imaging System (NVIS) Compatible) was written to replace MIL-L-85762. MIL-STD-3009 implements acquisition reform principles by deleting detailed design requirements and maintaining the essential interface characteristics.

  6. 48 CFR 52.211-2 - Availability of Specifications, Standards, and Data Item Descriptions Listed in the Acquisition...

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... ASSIST websites: (1) ASSIST (https://assist.dla.mil/online/start/; (2) Quick Search (http://quicksearch.dla.mil/; (3) ASSISTdocs.com (http://assistdocs.com). (b) Documents not available from ASSIST may be... Wizard (https://assist.dla.mil/wizard/index.cfm); (2) Phoning the DoDSSP Customer Service Desk (215)...

  7. 32 CFR 159.6 - Procedures.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...://www.dtic.mil/whs/directives/corres/pdf/520008r.pdf. 10 Available athttp://www.dtic.mil/whs/directives... hostile acts or demonstrated hostile intent. 11 Available athttp://www.dtic.mil/whs/directives/corres/pdf/110022p.pdf. (D) Documentation of individual training covering weapons familiarization and...

  8. Effect of central metal ions of analogous metal-organic frameworks on adsorption of organoarsenic compounds from water: plausible mechanism of adsorption and water purification.

    PubMed

    Jun, Jong Won; Tong, Minman; Jung, Beom K; Hasan, Zubair; Zhong, Chongli; Jhung, Sung Hwa

    2015-01-01

    The adsorptive removal of organoarsenic compounds such as p-arsanilic acid (ASA) and roxarsone (ROX) from water using metal-organic frameworks (MOFs) has been investigated for the first time. A MOF, iron benzenetricarboxylate (also called MIL-100-Fe) exhibits a much higher adsorption capacity for ASA and ROX than activated carbon, zeolite (HY), goethite, and other MOFs. The adsorption of ASA and ROX over MIL-100-Fe is also much more rapid than that over activated carbon. Moreover, the used MIL-100-Fe can be recycled by simply washing with acidic ethanol. Therefore, it is determined that a MOF such as MIL-100-Fe can be used to remove organoarsenic compounds from contaminated water because of its high adsorption capacity, rapid adsorption, and ready regeneration. Moreover, only one of three analogous MIL-100 species (MIL-100-Fe, rather than MIL-100-Al or MIL-100-Cr) can effectively remove the organoarsenic compounds. This selective and high adsorption over MIL-100-Fe, different from other analogous MIL-100 species, can be explained (through calculations) by the facile desorption of water from MIL-100-Fe as well as the large (absolute value) replacement energy (difference between the adsorption energies of the organoarsenic compounds and water) exhibited by MIL-100-Fe. A plausible adsorption/desorption mechanism is proposed based on the surface charge of the MOFs, FTIR results, calculations, and the reactivation results with respect to the solvents used in the experiments. PMID:25298118

  9. 32 CFR 701.102 - Online resources.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... online Web site (http://www.privacy.navy.mil). This Web site supplements this subpart and subpart G. It...) Web site (http://www.doncio.navy.mil). This Web site provides detailed guidance on PIAs. (c) DOD's PA Web site (http://www.defenselink.mil/privacy). This Web site is an excellent resource that contains...

  10. 40 CFR 1048.110 - How must my engines diagnose malfunctions?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... formats, codes, and connections. Follow conventions defined in 40 CFR 1045.110 or in the following...-control system is not functioning properly. (b) Use a malfunction-indicator light (MIL). The MIL must be... addition to the light signal. The MIL must go on under each of the following circumstances: (1) When...

  11. 32 CFR 108.2 - Applicability.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... Internet at http://www.dtic.mil/whs/directives/corres/pdf/300005p.pdf. 2 Copies available on the Internet at http://www.dtic.mil/whs/directives/corres/pdf/220502p.pdf. 3 Copies available on the Internet at http://www.dtic.mil/whs/directives/corres/pdf/231008p.pdf....

  12. 48 CFR 237.173-3 - Policy.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... Determining Workforce Mix (http://www.dtic.mil/whs/directives/corres/pdf/110022p.pdf); DoD Directive 2310.01E, The Department of Defense Detainee Program (http://www.dtic.mil/whs/directives/corres/pdf/231001p.pdf... Questioning (http://www.dtic.mil/whs/directives/corres/pdf/311509p.pdf)); pertaining to detainee...

  13. 48 CFR 237.173-3 - Policy.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... Determining Workforce Mix (http://www.dtic.mil/whs/directives/corres/pdf/110022p.pdf); DoD Directive 2310.01E, The Department of Defense Detainee Program (http://www.dtic.mil/whs/directives/corres/pdf/231001p.pdf... Questioning (http://www.dtic.mil/whs/directives/corres/pdf/311509p.pdf)); pertaining to detainee...

  14. 32 CFR 108.2 - Applicability.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... Internet at http://www.dtic.mil/whs/directives/corres/pdf/300005p.pdf. 2 Copies available on the Internet at http://www.dtic.mil/whs/directives/corres/pdf/220502p.pdf. 3 Copies available on the Internet at http://www.dtic.mil/whs/directives/corres/pdf/231008p.pdf....

  15. 32 CFR 117.55 - Responsibilities.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...))” (available at http://www.dtic.mil/whs/directives/corres/pdf/514301p.pdf) and DoD Instruction 5220.22, “National Industrial Security Program” (see http://www.dtic.mil/whs/directives/corres/pdf/522022p.pdf): (1...://www.dtic.mil/whs/directives/corres/pdf/522022p.pdf). (1) Make FOCI determinations on a...

  16. 48 CFR 237.173-3 - Policy.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... Determining Workforce Mix (http://www.dtic.mil/whs/directives/corres/pdf/110022p.pdf); DoD Directive 2310.01E, The Department of Defense Detainee Program (http://www.dtic.mil/whs/directives/corres/pdf/231001p.pdf... Questioning (http://www.dtic.mil/whs/directives/corres/pdf/311509p.pdf)); pertaining to detainee...

  17. 48 CFR 237.173-3 - Policy.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... Determining Workforce Mix (http://www.dtic.mil/whs/directives/corres/pdf/110022p.pdf); DoD Directive 2310.01E, The Department of Defense Detainee Program (http://www.dtic.mil/whs/directives/corres/pdf/231001p.pdf... Questioning (http://www.dtic.mil/whs/directives/corres/pdf/311509p.pdf)); pertaining to detainee...

  18. 32 CFR 701.102 - Online resources.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... online Web site (http://www.privacy.navy.mil). This Web site supplements this subpart and subpart G. It...) Web site (http://www.doncio.navy.mil). This Web site provides detailed guidance on PIAs. (c) DOD's PA Web site (http://www.defenselink.mil/privacy). This Web site is an excellent resource that contains...

  19. 32 CFR 701.102 - Online resources.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... online Web site (http://www.privacy.navy.mil). This Web site supplements this subpart and subpart G. It...) Web site (http://www.doncio.navy.mil). This Web site provides detailed guidance on PIAs. (c) DOD's PA Web site (http://www.defenselink.mil/privacy). This Web site is an excellent resource that contains...

  20. 32 CFR 701.102 - Online resources.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... online Web site (http://www.privacy.navy.mil). This Web site supplements this subpart and subpart G. It...) Web site (http://www.doncio.navy.mil). This Web site provides detailed guidance on PIAs. (c) DOD's PA Web site (http://www.defenselink.mil/privacy). This Web site is an excellent resource that contains...

  1. 32 CFR 701.102 - Online resources.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... online Web site (http://www.privacy.navy.mil). This Web site supplements this subpart and subpart G. It...) Web site (http://www.doncio.navy.mil). This Web site provides detailed guidance on PIAs. (c) DOD's PA Web site (http://www.defenselink.mil/privacy). This Web site is an excellent resource that contains...

  2. 40 CFR 86.1910 - How must I prepare and test my in-use engines?

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...)(3)(x), unless we instruct you not to send them. (b) You may treat a vehicle with an illuminated MIL or stored trouble code as follows: (1) If the length of MIL illumination or trouble code storage is... replace it with another vehicle. If you repair or reject the vehicle, you must describe the MIL or...

  3. 40 CFR 86.1910 - How must I prepare and test my in-use engines?

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...)(3)(x), unless we instruct you not to send them. (b) You may treat a vehicle with an illuminated MIL or stored trouble code as follows: (1) If the length of MIL illumination or trouble code storage is... replace it with another vehicle. If you repair or reject the vehicle, you must describe the MIL or...

  4. Adsorptive removal of bisphenol-A from water with a metal-organic framework, a porous chromium-benzenedicarboxylate.

    PubMed

    Park, Eun Young; Hasan, Zubair; Khan, Nazmul Abedin; Jhung, Sung Hwa

    2013-04-01

    Adsorptive removal of bisphenol-A (BPA) using a MOF, Cr-benzenedicarboxylate (MIL-53), has been studied to understand the applicability of MOFs for the removal of hazardous endocrine disturbing chemicals from water. MIL-53 shows very fast adsorption in an hour and the adsorption capacity of MIL-53 is higher than that of activated carbon. Importantly, the adsorption of BPA over MIL-53 is very favorable especially at very low concentrations of BPA. Therefore, MOFs such as MIL-53 can be one of adsorbents that may be used in the adsorptive removal of BPA from contaminated water. PMID:23763161

  5. Fe-based MOFs for efficient adsorption and degradation of acid orange 7 in aqueous solution via persulfate activation

    NASA Astrophysics Data System (ADS)

    Li, Xianghui; Guo, Weilin; Liu, Zhonghua; Wang, Ruiqin; Liu, Hua

    2016-04-01

    Fe-based metal-organic frameworks (MOFs) including MIL-101(Fe), MIL-100(Fe), MIL-53(Fe), and MIL-88B(Fe) prepared via a facile solvothermal process were introduced as both adsorbents and catalysts to generate powerful radicals from persulfate for acid orange 7 (AO7) removal in aqueous solution. Various catalysts were described and characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and X-ray photoelectron spectra. Because of the high specific surface area of the materials, we studied the adsorption isotherms of the four MILs by the fitting of Langmuir adsorption isotherm. Meanwhile, the catalytic activities in persulfate oxidation system were investigated. The results showed that the sequence of the materials ability in the combination of adsorption and degradation was MIL-101(Fe) > MIL-100(Fe) > MIL-53(Fe) > MIL-88B(Fe), which had a close connection with the activity of metal ion in active site of the catalysts and their different cages in size. Moreover, the reactive species in MILs/persulfate system were identified as sulfate radicals and hydroxyl radicals. The reaction mechanism for persulfate activation over MILs was also studied.

  6. Deducing CO2 motion, adsorption locations and binding strengths in a flexible metal-organic framework without open metal sites.

    PubMed

    Zhang, Yue; Lucier, Bryan E G; Huang, Yining

    2016-03-16

    Microporous metal-organic frameworks (MOFs) have high surface areas and porosities, and are well-suited for CO2 capture. MIL-53 features corner-sharing MO4(OH)2 (M = Al, Ga, Cr, etc.) octahedra interconnected by benzenedicarboxylate linkers that form one-dimensional rhombic tunnels, and exhibits an excellent adsorption ability for guest molecules such as CO2. Studying the behavior of adsorbed CO2 in MIL-53 via solid-state NMR (SSNMR) provides rich information on the dynamic motion of guest molecules as well as their binding strengths to the MOF host, and sheds light on the specific guest adsorption mechanisms. Variable-temperature (13)C SSNMR spectra of (13)CO2 adsorbed within various forms of MIL-53 are acquired and analyzed. CO2 undergoes a combination of two motions within MIL-53; we report the types of motion present, their rates, and rotational angles. (1)H-(13)C CP SSNMR experiments are used to examine the proximity of (1)H atoms in the MOF to (13)C atoms in CO2 guests. By replacing (1)H with (2)H in MIL-53, the location of the CO2 adsorption site in MIL-53 is experimentally confirmed by (1)H-(13)C CP SSNMR. The binding strength of CO2 within these MIL-53 MOFs follows the order MIL-53-NH2 (Al) > MIL-53-NH2 (Ga) > MIL-53 (Al) > MIL-53 (Ga). PMID:26427010

  7. Water, hydrogen, deuterium, carbon, carbon-13, and oxygen-18 content of selected lunar material

    USGS Publications Warehouse

    Friedman, I.; O'Neil, J.R.; Adami, L.H.; Gleason, J.D.; Hardcastle, K.

    1970-01-01

    The water content of the breccia is 150 to 455 ppm, with a ??D from -580 to -870 per mil. Hydrogen gas content is 40 to 53 ppm with a ??D of -830 to -970 per mil. The CO2 is 290 to 418 ppm with S 13C = + 2.3 to + 5.1 per mil and ??18O = 14.2 to 19.1 per mil. Non-CO2 carbon is 22 to 100 ppm, ??18C = -6.4 to -23.2 per mil. Lunar dust is 810 ppm H2O (D = 80 ppm) and 188 ppm total carbon (??13C = -17.6 per mil). The 18O analyses of whole rocks range from 5.8 to 6.2 per mil. The temperature of crystallization of type B rocks is 1100?? to 1300??C, based on the oxygen isotope fractionation between coexisting plagioclase and ilmenite.

  8. Multiple instance feature learning for landmine detection in ground-penetrating radar data

    NASA Astrophysics Data System (ADS)

    Bolton, Jeremy; Gader, Paul; Frigui, Hichem

    2010-04-01

    Multiple instance learning (MIL) is a technique used for identifying a target pattern within sets of data. In MIL, a learner is presented with sets of samples; whereas in standard techniques, a learner is presented with individual samples. The MI scenario is encountered given the nature of landmine detection in GPR data, and therefore landmine detection results should benefit from the use of multiple instance techniques. Previously, a random set framework for multiple instance learning (RSF-MIL) was proposed which utilizes random sets and fuzzy measures to model the MIL problem. An improved version C-RSF-MIL was recently developed showing a increase in learning and classification performance. This new approach is used to learn and characterize features of landmines within GPR imagery for the purposes of classification. Experimental results show the benefits of using C-RSF-MIL for landmine detection in GPR imagery.

  9. Pairing Relationships Among Feldspathic Lunar Meteorites from Miller Range, Antarctica

    NASA Technical Reports Server (NTRS)

    Zeigler, Ryan A.; Korotev, R. L.; Jolliff, B. L.

    2012-01-01

    The Miller Range ice fields have been amongst the most prolific for lunar meteorites that ANSMET has searched [1-3]. Six different stones have been recovered during the 2005, 2007, and 2009 field seasons: MIL 05035 (142 g), MIL 07006 (1.4 g), MIL 090034 (196 g), MIL 090036 (245 g), MIL 090070 (137 g), and MIL 090075 (144 g). Of these, the five stones collected during the 2007 and 2009 seasons are feldspathic breccias. Previous work on the Miller Range feldspathic lunar meteorites (FLMs) has suggested that they are not all paired with each other [4-5]. Here we examine the pairing relationships among the Miller Range FLMs using petrography in concert with traceand major-element compositions.

  10. Expression and Purification of Recombinant Mouse Interleukin-4 and -6 from Transgenic Rice Seeds.

    PubMed

    Fujiwara, Yoshihiro; Yang, Lijun; Takaiwa, Fumio; Sekikawa, Kenji

    2016-04-01

    Transgenic rice seed can be utilized as a bioreactor to produce high-value recombinant proteins. Mouse interleukin 4 (mIL-4) and mIL-6 were specifically expressed as secretory proteins in rice endosperm by ligating the N-terminal glutelin B-1 (GluB-1) signal peptide and the C-terminal KDEL endoplasmic reticulum retention signal under control of the endosperm-specific GluB-1 promoter. In the transgenic rice seed, mIL-4 and mIL-6 accumulated in levels up to 0.43 mg/g grain and 0.16 mg/g grain, respectively. The reducing agents and detergents required for extraction from the transgenic rice seeds differed between the two proteins, indicating differences in their intracellular localization within the endosperm cell. Purified mIL-4 and mIL-6 exhibited high activity and very low endotoxin contamination. PMID:26876890

  11. Research, development and pilot production of high output thin silicon solar cells

    NASA Technical Reports Server (NTRS)

    Iles, P. A.

    1976-01-01

    Work was performed to define and apply processes which could lead to high output from thin (2-8 mils) silicon solar cells. The overall problems are outlined, and two satisfactory process sequences were developed. These sequences led to good output cells in the thickness range to just below 4 mils; although the initial contract scope was reduced, one of these sequences proved capable of operating beyond a pilot line level, to yield good quality 4-6 mil cells of high output.

  12. Interleukin 4 receptor targeted cytotoxicity: genetic construction and in vivo immunosuppressive activity of a diphtheria toxin-related murine interleukin 4 fusion protein.

    PubMed

    Lakkis, F; Steele, A; Pacheco-Silva, A; Rubin-Kelley, V; Strom, T B; Murphy, J R

    1991-09-01

    The interleukin 4 (IL 4) receptor is expressed on various cells of the immune system, including T and B lymphocytes, macrophages and mast cells. We have constructed a recombinant protein, DAB389-mIL 4, that is composed of the enzymatically active and membrane translocation domains of diphtheria toxin fused to murine IL 4. We demonstrate that this fusion toxin selectively inhibits protein synsthesis in eukaryotic cells which express the murine IL 4 receptor. The cytotoxic potency of this fusion toxin is shown to be directly proportional to the reported number of IL 4 receptors on the surface of target cells. Since the action of DAB389-mIL 4 can be blocked with either excess mIL 4 or antibody to mIL 4, we conclude that its entry into target cells is mediated through the mIL 4 receptor. A mutant form of DAB389-mIL 4, DA(197)B389-mIL 4, in which the fragment A-associated ADP-ribosyltransferase is inactive, is not cytotoxic to murine IL 4 receptor-bearing cells. Finally, we demonstrate that DAB389-mIL 4 administered subcutaneously to DBA/2 mice results in suppression of delayed-type hypersensitivity (DTH); whereas, the non-toxic DA(197)B389-mIL 4 fails to dampen the DTH response. PMID:1679715

  13. Empirical study of the interaction of silicon substrate thinness, device design, and solar cell processing

    NASA Technical Reports Server (NTRS)

    Pryor, R. A.

    1980-01-01

    Processing experiments using wire-saw techniques to slice thin silicon wafers are described. Substrates were sliced directly to 17 mil, 8 mil, and 5 mil thicknesses. Some of the 8 mil substrates and all of the 5 mil substrates were chemically etched to 7 and 4 mils, respectively, to guarantee removal of any saw damage. The wafers wire sawed to 17 mil thicknesses were processed as reference cells. A baseline process which results in an n(+)-p cell structure, and two advanced processes which provide n(+)-p-p(+) structures were utilized. By using a p(+) enhancement layer on the solar cell back surface, the performance of the 7 mil wafers was increased to exceed that of the 17 mil solar cells with simple n(+)-p structures. Cells fabricated by an ion implantation sequence utilizing elemental boron and phosphorus implants were shown to be capable of equalling or exceeding the performance of cells fabricated by an equivalent all-diffusion process.

  14. Amazon capims (floating grassmats) - A source of C-13 enriched methane to the troposphere

    NASA Technical Reports Server (NTRS)

    Chanton, Jeffrey; Crill, Patrick; Bartlett, Karen; Martens, Christopher

    1989-01-01

    The C-13 isotopic composition of methane emitted to the troposphere from Amazon capims (floating grassmats) ranged from -36.9 to -48.0, per mil averaging -44.4 + or - 4.2 per mil. All pools of methane associated with the grassmats were enriched; methane withdrawn from plant stems ranged from -39 to -49 per mil while bubbles stirred from the root mat averaged -41.4 per mil. As the CH4 flux from these habitats makes up some 40 percent of the total flux from the Amazon floodplain, methane emissions from the region as a whole must be enriched in.

  15. 33 CFR 148.115 - How many copies of the application must I send and where must I send them?

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) DEEPWATER PORTS DEEPWATER PORTS: GENERAL... proposed deepwater port. For the address, see http://www.usace.army.mil/. (d) Additional printed...

  16. 33 CFR 148.115 - How many copies of the application must I send and where must I send them?

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) DEEPWATER PORTS DEEPWATER PORTS: GENERAL... proposed deepwater port. For the address, see http://www.usace.army.mil/. (d) Additional printed...

  17. Photoreactivity of Metal-Organic Frameworks in Aqueous Solutions: Metal Dependence of Reactive Oxygen Species Production.

    PubMed

    Liu, Kai; Gao, Yanxin; Liu, Jing; Wen, Yifan; Zhao, Yingcan; Zhang, Kunyang; Yu, Gang

    2016-04-01

    Promising applications of metal-organic frameworks (MOFs) in various fields have raised concern over their environmental fate and safety upon inevitable discharge into aqueous environments. Currently, no information regarding the transformation processes of MOFs is available. Due to the presence of repetitive π-bond structure and semiconductive property, photochemical transformations are an important fate process that affects the performance of MOFs in practical applications. In the current study, the generation of reactive oxygen species (ROS) in isoreticular MIL-53s was studied. Scavengers were employed to probe the production of (1)O2, O2(•-), and •OH, respectively. In general, MIL-53(Cr) and MIL-53(Fe) are dominated by type I and II photosensitization reactions, respectively, and MIL-53(Al) appears to be less photoreactive. The generation of ROS in MIL-53(Fe) may be underestimated due to dismutation. Further investigation of MIL-53(Fe) encapsulated diclofenac transformation revealed that diclofenac can be easily transformed by MIL-53(Fe) generated ROS. However, the cytotoxicity results implied that the ROS generated from MIL-53s have little effect on the viability of the human hepatocyte (HepG2) cell line. These results suggest that the photogeneration of ROS by MOFs may be metal-node dependent, and the application of MIL-53s as drug carriers needs to be carefully considered due to their high photoreactivity. PMID:26942867

  18. In vitro selection of miltefosine resistance in promastigotes of Leishmania donovani from Nepal: genomic and metabolomic characterization.

    PubMed

    Shaw, C D; Lonchamp, J; Downing, T; Imamura, H; Freeman, T M; Cotton, J A; Sanders, M; Blackburn, G; Dujardin, J C; Rijal, S; Khanal, B; Illingworth, C J R; Coombs, G H; Carter, K C

    2016-03-01

    In this study, we followed the genomic, lipidomic and metabolomic changes associated with the selection of miltefosine (MIL) resistance in two clinically derived Leishmania donovani strains with different inherent resistance to antimonial drugs (antimony sensitive strain Sb-S; and antimony resistant Sb-R). MIL-R was easily induced in both strains using the promastigote-stage, but a significant increase in MIL-R in the intracellular amastigote compared to the corresponding wild-type did not occur until promastigotes had adapted to 12.2 μM MIL. A variety of common and strain-specific genetic changes were discovered in MIL-adapted parasites, including deletions at the LdMT transporter gene, single-base mutations and changes in somy. The most obvious lipid changes in MIL-R promastigotes occurred to phosphatidylcholines and lysophosphatidylcholines and results indicate that the Kennedy pathway is involved in MIL resistance. The inherent Sb resistance of the parasite had an impact on the changes that occurred in MIL-R parasites, with more genetic changes occurring in Sb-R compared with Sb-S parasites. Initial interpretation of the changes identified in this study does not support synergies with Sb-R in the mechanisms of MIL resistance, though this requires an enhanced understanding of the parasite's biochemical pathways and how they are genetically regulated to be verified fully. PMID:26713880

  19. Butyrate enhances antibacterial effects while suppressing other features of alternative activation in IL-4-induced macrophages.

    PubMed

    Fernando, Maria R; Saxena, Alpana; Reyes, José-Luis; McKay, Derek M

    2016-05-15

    The short-chain fatty acid butyrate is produced by fermentation of dietary fiber by the intestinal microbiota; butyrate is the primary energy source of colonocytes and has immunomodulatory effects. Having shown that macrophages differentiated with IL-4 [M(IL-4)s] can suppress colitis, we hypothesized that butyrate would reinforce an M(IL-4) phenotype. Here, we show that in the presence of butyrate M(IL-4)s display reduced expression of their hallmark markers Arg1 and Ym1 and significantly suppressed LPS-induced nitric oxide, IL-12p40, and IL-10 production. Butyrate treatment likely altered the M(IL-4) phenotype via inhibition of histone deacetylation. Functionally, M(IL-4)s treated with butyrate showed increased phagocytosis and killing of bacteria, compared with M(IL-4) and this was not accompanied by enhanced proinflammatory cytokine production. Culture of regulatory T cells with M(IL-4)s and M(IL-4 + butyrate)s revealed that both macrophage subsets suppressed expression of the regulatory T-cell marker Foxp3. However, Tregs cocultured with M(IL-4 + butyrate) produced less IL-17A than Tregs cocultured with M(IL-4). These data illustrate the importance of butyrate, a microbial-derived metabolite, in the regulation of gut immunity: the demonstration that butyrate promotes phagocytosis in M(IL-4)s that can limit T-cell production of IL-17A reveals novel aspects of bacterial-host interaction in the regulation of intestinal homeostasis. PMID:27012776

  20. Lithium Isotope Ratios in Foraminifera - A Potential Proxy for Geologic Evolution of Cenozoic Seawater Chemistry

    NASA Astrophysics Data System (ADS)

    Misra, S.; Froelich, P. N.

    2008-12-01

    The Li isotope ratio of seawater (δ7Li) recorded in planktonic foraminifera has the potential to elucidate changes in seawater chemistry and the factors driving variations of oceanic silica mass balances linked to continental and sea floor/hydrothermal weathering. To establish the validity of forams as a recorder of seawater δ7Li, we measured Li/Ca, Mg/Ca, Mn/Ca, V/Ca, Sr/Ca and Ba/Ca in cleaned core top foraminifera samples from Caribbean Sea and Gulf of Mexico from (a) 9 individual species, (b) size fractions of the same species and (c) bulk samples of size fractions. Samples were chemically cleaned with a reductive-oxidative-reductive (R-O-R) cleaning sequence. The high precision (<0.9 per mil, 2σ), low blank (<500fg/ml) and low Li mass requirement (<0.3ng/quintuplicate) of our method allows precise δ7Li determination using <1.0mg of forams and <5.0μl of seawater by single collector Quadrupole ICP-MS (Agilent 7500cs). Our seawater δ7Li value (30.79 per mil ±0.91 per mil, 2σ, n=10) is the same as that reported by other workers (~31 per mil ±0.5 per mil). Species-specific δ7Li analyses of Orbulina universa (>300μm) from both Caribbean Sea (30.72 per mil ±1.43 per mil, n=5) and Gulf of Mexico (30.16 per mil ±1.37 per mil, n=4) yield values similar to modern seawater. δ7Li values of Globigerina triloba and Globorotalia menardii (Caribbean Sea, >300μm) are (30.12 per mil ±1.34 per mil, n=4) and (30.29 per mil ±0.92 per mil, n=4). The 212μ m-300μm size fractions of triloba (30.05 per mil) and menardii (30.29 per mil) from the Caribbean Sea produced similar δ7Li values, indicating the absence of size dependent fractionation in at least two species. Bulk foram analyses of >300μm (29.84 per mil ±1.52 per mil, n=2) and 212μm-300μm (30.25 per mil ±1.61 per mil) also produced δ7Li values similar to seawater. Identical δ7Li values, within error, of two fractions of bulk samples with seawater encourages the potential use of bulk foraminiferal samples instead of a species- specific bootstrap approach to create a long-term δ7Li record of seawater. δ7Li values for Neogloboquadrina dutertrei (29.72 per mil ±0.97 per mil), Globigerinoides ruber (30.56 per mil ±1.41 per mil) and Globigerinoides sacculifera (28.99 per mil ±1.04 per mil) from Caribbean samples yield values similar to seawater. Globorotalia tumida (28.21 per mil ±2.04 per mil) is somewhat low for reasons not yet understood.Globorotalia truncatulionoides (29.10per mil ±2.19 per mil) and Globigerinoides conglobatus (27.94 per mil ±1.95 per mil) from the Gulf of Mexico yield δ7Li values lower than seawater with comparatively larger errors in δ7Li. Samples with high Mn/Ca ratio (>20μmol/mol) produce δ7Li values significantly lower (4 per mil to 6 per mil) than seawater, emphasizing the importance of multiple oxidative-reductive (R-O-R) cleaning of forams to remove metal oxide deposits. No significant correlation was observed between δ7Li and Li/Ca ratio of foram samples, suggesting that the Li isotope ratio of forams is independent of its Li concentration. There are also no significant relations between other metals (Mg, Mn, Sr and Ba) and δ7Li that might invoke fractionation effects as dissolution or gametogenetic calcite. Analyses of >300μm bulk fraction from Equatorial Indian Ocean Site 758 (0-6.5 Ma) and Western Equatorial Atlantic Site 926 (5.0-14.0 Ma) are in progress.

  1. 32 CFR 108.2 - Applicability.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... Internet at http://www.dtic.mil/whs/directives/corres/pdf/300005p.pdf. 2 Copies available on the Internet at http://www.dtic.mil/whs/directives/corres/pdf/220502p.pdf. 3 Copies available on the Internet...

  2. 32 CFR 108.2 - Applicability.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... Internet at http://www.dtic.mil/whs/directives/corres/pdf/300005p.pdf. 2 Copies available on the Internet at http://www.dtic.mil/whs/directives/corres/pdf/220502p.pdf. 3 Copies available on the Internet...

  3. 46 CFR 164.023-5 - Performance; standard thread.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    .... or size range V-T-285E Polyester I or II 1 E, F, FF. V-T-295E Nylon I or II A E, F, FF. MIL-T-43624A Polyester 24 through 12. MIL-T-43548C Polyester covered only 24 through 12. (b) Use Code 4B. Each...

  4. 46 CFR 164.023-5 - Performance; standard thread.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    .... or size range V-T-285E Polyester I or II 1 E, F, FF. V-T-295E Nylon I or II A E, F, FF. MIL-T-43624A Polyester 24 through 12. MIL-T-43548C Polyester covered only 24 through 12. (b) Use Code 4B. Each...

  5. Identification of microRNA-like RNAs from Curvularia lunata associated with maize leaf spot by bioinformation analysis and deep sequencing.

    PubMed

    Liu, Tong; Hu, John; Zuo, Yuhu; Jin, Yazhong; Hou, Jumei

    2016-04-01

    Deep sequencing of small RNAs is a useful tool to identify novel small RNAs that may be involved in fungal growth and pathogenesis. In this study, we used HiSeq deep sequencing to identify 747,487 unique small RNAs from Curvularia lunata. Among these small RNAs were 1012 microRNA-like RNAs (milRNAs), which are similar to other known microRNAs, and 48 potential novel milRNAs without homologs in other organisms have been identified using the miRBase© database. We used quantitative PCR to analyze the expression of four of these milRNAs from C. lunata at different developmental stages. The analysis revealed several changes associated with germinating conidia and mycelial growth, suggesting that these milRNAs may play a role in pathogen infection and mycelial growth. A total of 8334 target mRNAs for the 1012 milRNAs that were identified, and 256 target mRNAs for the 48 novel milRNAs were predicted by computational analysis. These target mRNAs of milRNAs were also performed by gene ontology and Kyoto Encyclopedia of Genes and Genomes pathway analysis. To our knowledge, this study is the first report of C. lunata's milRNA profiles. This information will provide a better understanding of pathogen development and infection mechanism. PMID:26481645

  6. 78 FR 20623 - Environmental Impact Statement for Modernization and Repair of Piers 2 and 3, Military Ocean...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-04-05

    ... Act to gather information to prepare an Environmental Impact Statement (EIS) related to the critically...: usarmy.motco.sddc.mbx.list-eis@mail.mil or fax (925) 246-4171. FOR FURTHER INFORMATION CONTACT: Please...-4171; email: usarmy.motco.sddc.mbx.list-eis@mail.mil . SUPPLEMENTARY INFORMATION: The decision to...

  7. 32 CFR 505.5 - Individual access to personal information.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...'s Web site http://www.defenselink.mil/privacy). (2) Individuals do not have to state a reason or... refusal to provide his or her Social Security Number (SSN) unless the SSN was required for access by... Privacy Office's Web site http://www.defenselink.mil/privacy or DA PAM 25-51. (j) No...

  8. CO2-Selective Nanoporous Metal-Organic Framework Microcantilevers.

    PubMed

    Yim, Changyong; Lee, Moonchan; Yun, Minhyuk; Kim, Gook-Hee; Kim, Kyong Tae; Jeon, Sangmin

    2015-01-01

    Nanoporous anodic aluminum oxide (AAO) microcantilevers are fabricated and MIL-53 (Al) metal-organic framework (MOF) layers are directly synthesized on each cantilever surface by using the aluminum oxide as the metal ion source. Exposure of the MIL53-AAO cantilevers to various concentrations of CO2, N2, CO, and Ar induces changes in their deflections and resonance frequencies. The results of the resonance frequency measurements for the different adsorbed gas molecules are almost identical when the frequency changes are normalized by the molecular weights of the gases. In contrast, the deflection measurements show that only CO2 adsorption induces substantial bending of the MIL53-AAO cantilevers. This selective deflection of the cantilevers is attributed to the strong interactions between CO2 and the hydroxyl groups in MIL-53, which induce structural changes in the MIL-53 layers. Simultaneous measurements of the resonance frequency and the deflection are performed to show that the diffusion of CO2 into the nanoporous MIL-53 layers occurs very rapidly, whereas the binding of CO2 to hydroxyl groups occurs relatively slowly, which indicates that the adsorption of CO2 onto the MIL-53 layers and the desorption of CO2 from the MIL-53 layers are reaction limited. PMID:26035805

  9. Preclinical evaluation of recombinant human IFNα2b-containing magnetoliposomes for treating hepatocellular carcinoma

    PubMed Central

    Ye, Hui; Tong, Jiansong; Wu, Jianzhang; Xu, Xia; Wu, Shenjie; Tan, Botao; Shi, Mengjing; Wang, Jianguang; Zhao, Weibo; Jiang, Heng; Jin, Sha

    2014-01-01

    Magnetoliposomes are phospholipid vesicles encapsulating magnetic nanoparticles that can be used to encapsulate therapeutic drugs for delivery into specific organs. Herein, we developed magnetoliposomes containing recombinant human IFNα2b, designated as MIL, and evaluated this combination’s biological safety and therapeutic effect on both cellular and animal hepatocellular carcinoma models. Our data showed that MIL neither hemolyzed erythrocytes nor affected platelet-aggregation rates in blood. Nitroblue tetrazolium-reducing testing showed that MIL did not change the absolute numbers or phagocytic activities of leukocytes. Acute-toxicity testing also showed that MIL had no devastating effect on mice behaviors. All the results indicated that the nanoparticles could be a safe biomaterial. Pharmacokinetic analysis and tissue-distribution studies showed that MIL maintained stable and sustained drug concentrations in target organs under a magnetic field, helped to increase bioavailability, and reduced administration time. MIL also dramatically inhibited the growth of hepatoma cells. Targeting of MIL in the livers of nude mice bearing human hepatocellular carcinoma showed that MIL significantly reduced the tumor size to 38% of that of the control group. Further studies proved that growth inhibition of cells or tumors was due to apoptosis-signaling pathway activation by human IFNα2b. PMID:25288882

  10. 32 CFR 239.15 - List of HAP field offices.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ..., Homeowners Assistance Program, HQ U.S. Army Corps of Engineers Real Estate Directorate, Military Division..., Sacramento, CA 95814-2922, (916) 557-6850 OR, 1-800-811-5532, Internet Address: http://www.spk.usace.army.mil..., 1-800-861-8144, Internet Address: http://www.sas.usace.army.mil Alabama, Georgia, North...

  11. 32 CFR 239.15 - List of HAP field offices.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ..., Homeowners Assistance Program, HQ U.S. Army Corps of Engineers Real Estate Directorate, Military Division..., Sacramento, CA 95814-2922, (916) 557-6850 OR, 1-800-811-5532, Internet Address: http://www.spk.usace.army.mil..., 1-800-861-8144, Internet Address: http://www.sas.usace.army.mil Alabama, Georgia, North...

  12. Elastomer shelf life

    SciTech Connect

    Boyum, B.M.; Rhoads, J.E.

    1989-06-01

    The shelf life of elastomeric products used in the Nuclear Industry is typically based on military standards (MIL-HDBK-695C (1) or MIL- STD-1523A (2)). Recently, data became available on naturally aged O-rings that were over 30 years old. An evaluation of this data is presented to demonstrate the conservatism of current guidelines.

  13. 48 CFR 247.573-1 - Ocean transportation incidental to a contract for supplies, services, or construction.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... (SDDC), through the SDDC global e-mailbox sddc.ops.ffw@us.army.mil and the Principal Assistant..., and the commercial reasonableness of vessel positioning required); and (4) Any other relevant economic..., through the SDDC global e-mailbox: sddc.ops.ffw@us.army.mil and the Principal Assistant Responsible...

  14. 48 CFR 247.573-1 - Ocean transportation incidental to a contract for supplies, services, or construction.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... (SDDC), through the SDDC global e-mailbox sddc.ops.ffw@us.army.mil and the Principal Assistant..., and the commercial reasonableness of vessel positioning required); and (4) Any other relevant economic..., through the SDDC global e-mailbox: sddc.ops.ffw@us.army.mil and the Principal Assistant Responsible...

  15. 48 CFR 247.573-1 - Ocean transportation incidental to a contract for supplies, services, or construction.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... (SDDC), through the SDDC global e-mailbox sddc.ops.ffw@us.army.mil and the Principal Assistant..., and the commercial reasonableness of vessel positioning required); and (4) Any other relevant economic..., through the SDDC global e-mailbox: sddc.ops.ffw@us.army.mil and the Principal Assistant Responsible...

  16. 48 CFR 247.573-1 - Ocean transportation incidental to a contract for supplies, services, or construction.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... (SDDC), through the SDDC global e-mailbox sddc.ops.ffw@us.army.mil and the Principal Assistant..., and the commercial reasonableness of vessel positioning required); and (4) Any other relevant economic..., through the SDDC global e-mailbox: sddc.ops.ffw@us.army.mil and the Principal Assistant Responsible...

  17. 48 CFR 247.573-1 - Ocean transportation incidental to a contract for supplies, services, or construction.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... (SDDC), through the SDDC global e-mailbox sddc.ops.ffw@us.army.mil and the Principal Assistant..., and the commercial reasonableness of vessel positioning required); and (4) Any other relevant economic..., through the SDDC global e-mailbox: sddc.ops.ffw@us.army.mil and the Principal Assistant Responsible...

  18. Therapeutic effect of irradiation of magnetic infrared laser on osteoarthritis rat model.

    PubMed

    Moon, Chul-Hwan; Kwon, Ogon; Woo, Chang-Hoon; Ahn, Hee-Duk; Kwon, Young-Sam; Park, Soo-Jin; Song, Chang-Hyun; Ku, Sae-Kwang

    2014-01-01

    Osteoarthritis (OA) is a degenerative joint disease caused by articular cartilage loss. Many complementary and alternative medicines for OA have been reported so far, but the effectiveness is controversial. Previously, we have shown anti-inflammatory effects of low level laser therapy with static magnetic field, magnetic infrared laser (MIL), in various animal models. Therefore, the beneficial effects were examined in OA rat model. Rats were divided by six groups; no treatment controls of sham and OA model, three MIL treatment groups of OA model at 6.65, 2.66 and 1.33 J cm(-2), and Diclofenac group of OA model with 2 mg kg(-1) diclofenac sodium. The OA control exhibited typical symptoms of OA, but 4-week MIL treatment improved the functional movement of knee joint with reduced edematous changes. In addition, cartilage GAGs were detected more in all MIL treatment groups than OA control. It suggests that 4-week MIL irradiation has dose-dependent anti-inflammatory and chondroprotective effects on OA. Histopathological analyses revealed that MIL treatment inhibits the cartilage degradation and enhances chondrocyte proliferation. The fact that MIL has an additional potential for the cartilage formation and no adverse effects can be regarded as great advantages for OA treatment. These suggest that MIL can be useful for OA treatment. PMID:24962501

  19. 40 CFR 721.9825 - Phenyl substituted triazolinones.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...-94-1871 through P-94-1874, EPA has approved North Safety Butyl Rubber gloves (32 mils thick). For P-93-204 and P-94-1870, EPA has approved North Safety Butyl Rubber gloves (32 mils thick) only if used...)(3)(ii), (g)(4)(i), and (g)(5). (iii) Release to water. Requirements as specified in § 721.90...

  20. 40 CFR 721.9825 - Phenyl substituted triazolinones.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...-94-1871 through P-94-1874, EPA has approved North Safety Butyl Rubber gloves (32 mils thick). For P-93-204 and P-94-1870, EPA has approved North Safety Butyl Rubber gloves (32 mils thick) only if used...)(3)(ii), (g)(4)(i), and (g)(5). (iii) Release to water. Requirements as specified in § 721.90...

  1. Metal-organic frameworks supported surface-imprinted nanoparticles for the sensitive detection of metolcarb.

    PubMed

    Qian, Kun; Deng, Qiliang; Fang, Guozhen; Wang, Junping; Pan, Mingfei; Wang, Shuo; Pu, Yuehong

    2016-05-15

    A novel approach to synthesize molecularly imprinted polymer (MIP) nanoparticles using a MIL-101 support (a type of metal-organic framework) is reported herein for the first time; the sample is referred as MIL@MIP. The nanoparticles were well distributed within the polymer film, and exhibit an octahedral shape, satisfied thermal stability, and a high specific surface area (SSA) of 1579.43 m(2)g(-1). The adsorption behavior of MIL@MIP toward metolcarb in aqueous solution was subsequently examined. The synthesized MIL@MIP displayed satisfactory high transfer mass rates and a high selective adsorption affinity for metolcarb. Based on these results, a quartz crystal microbalance (QCM) sensor based on MIL@MIP was subsequently constructed and examined for the sensitive detection of metolcarb. Under optimal conditions, the detection limit of the system assessed in pear juice was 0.0689 mg L(-1) within a linear concentration range of 0.1-0.9 mg L(-1). MIL@MIP-QCM system combines the advantages of MIL-101 and molecularly imprinted technology (MIT), thereby achieving high detection sensitivity and selectivity. The current findings suggest the potential of MIL@MIP for detecting trace level pesticides and veterinary drugs for food safety and environmental control. PMID:26735869

  2. 32 CFR 317.1 - Purpose

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...); DoD 5400.11 and DoD 5400.11-R, 2 “DoD Privacy Program” (32 CFR part 310); and is intended to promote uniformity within DCAA. 1 Copies may be obtained from http://www.deskbook.osd.mil. 2 Copies may be obtained from http://web7.whs.osd.mil....

  3. 40 CFR 86.010-18 - On-board Diagnostics for engines used in applications greater than 14,000 pounds GVWR.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... Model Year New Light-Duty Vehicles, Light-Duty Trucks and Heavy-Duty Engines, and for 1985 and Later... onboard computer's memory. A malfunction indicator light (MIL) must also be activated as specified in... data stream value must be updated accordingly. (b) Malfunction indicator light (MIL) and...

  4. 40 CFR 86.010-18 - On-board Diagnostics for engines used in applications greater than 14,000 pounds GVWR.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... Model Year New Light-Duty Vehicles, Light-Duty Trucks and Heavy-Duty Engines, and for 1985 and Later... onboard computer's memory. A malfunction indicator light (MIL) must also be activated as specified in... data stream value must be updated accordingly. (b) Malfunction indicator light (MIL) and...

  5. 32 CFR 158.1 - Purpose.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... guidance in DoD Directive 3020.49 (see http://www.dtic.mil/whs/directives/corres/pdf/302049p.pdf) and the authority in DOD Directive 5134.01 (see http://www.dtic.mil/whs/directives/corres/pdf/513401p.pdf)....

  6. 32 CFR 60.4 - Policy.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...” (see http://www.dtic.mil/whs/directives/corres/pdf/602518r.pdf) and 5 U.S.C. 552a as implemented in the Department of Defense by 32 CFR part 310. ... Advocacy Program (FAP)” (see http://www.dtic.mil/whs/directives/corres/pdf/640001p.pdf). (b) Promote...

  7. 32 CFR 158.1 - Purpose.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... guidance in DoD Directive 3020.49 (see http://www.dtic.mil/whs/directives/corres/pdf/302049p.pdf) and the authority in DOD Directive 5134.01 (see http://www.dtic.mil/whs/directives/corres/pdf/513401p.pdf)....

  8. 32 CFR 158.1 - Purpose.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... guidance in DoD Directive 3020.49 (see http://www.dtic.mil/whs/directives/corres/pdf/302049p.pdf) and the authority in DOD Directive 5134.01 (see http://www.dtic.mil/whs/directives/corres/pdf/513401p.pdf)....

  9. 78 FR 64205 - Army Science Board Fall Plenary Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-10-28

    ... published in the Federal Register on October 2, 2013 (78 FR 60864) has been cancelled due to the Government....150(b), waives the 15-calendar day notification requirement. ] FOR FURTHER INFORMATION CONTACT: The..."> william.m.mclagan.mil @mail.mil or Carolyn German, (703) 545-8654,...

  10. 77 FR 37886 - Notice of Public Meetings for the Barry M. Goldwater Range, Arizona

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-06-25

    ... . FOR FURTHER INFORMATION CONTACT: BMGR East, Daniel Garcia, Luke Air Force Base, (623) 856-4265 or daniel.garcia@luke.af.mil BMGR West, Ron Pearce, Marine Corps Air Station Yuma, (928) 269-3401 or ronald.pearce@usmc.mil . The Public Report can be accessed from the following Web sites:...

  11. 46 CFR 160.023-5 - Labeling and marking.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...: SPECIFICATIONS AND APPROVAL LIFESAVING EQUIPMENT Hand Combination Flare and Smoke Distress Signals 160.023-5... MIL-S-18655, and to include the commercial designation of the signal, the lot number, Coast Guard... thoroughly dry. The label shall be attached to the signal and then protected by a transparent...

  12. Toppling Hierarchies? Media and Information Literacies, Ethnicity, and Performative Media Practices

    ERIC Educational Resources Information Center

    Drotner, Kirsten; Kobbernagel, Christian

    2014-01-01

    This article suggests how we should study media and information literacies (MIL) and do so at a time, when young people nurture these literacies through multiple media practices and across spaces of learning. Our basic argument is this: in order to gain a robust knowledge base for the development of MIL we need to study literacy practices beyond…

  13. 42 CFR 84.43 - Quality control records; review by the Institute; revocation of approval.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... been approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part... procedures required in MIL-STD-414, 11 June 1957, including Change Notice No. 1, “Sampling Procedures and.... MIL-STD-105D, 29 April 1963, “Sampling Procedures and Tables for Inspection by Attributes,” is...

  14. 77 FR 42489 - Notice of Availability of the Draft Feasibility Study; Environmental Impact Statement for the...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-07-19

    ... has prepared a Draft Feasibility Report/Environmental Impact Statement (FR/EIS) for the Chatfield... Engineers, Omaha District; CENWO-PM-AA; ATTN: Chatfield Reservoir Storage Reallocation FR/EIS; 1616 Capitol... chatfieldstudy@usace.army.mil mailto: Gwyn.M.Jarrett@usace.army.mil . Comments on the Draft FR/EIS for...

  15. 78 FR 51174 - Reserve Forces Policy Board (RFPB); Notice of Federal Advisory Committee Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-08-20

    ... Drive, Arlington, VA 22202. FOR FURTHER INFORMATION CONTACT: CAPT Steven Knight, Designated Federal Officer, (703) 681-0608 (Voice), (703) 681-0002 (Facsimile), Email-- steven.p.knight.mil@mail.mil. Mailing... Steven Knight, the Designated Federal Officer, not later than noon on Tuesday, September 3, 2013,...

  16. 78 FR 56680 - Reserve Forces Policy Board (RFPB); Notice of Federal Advisory Committee Meeting

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-09-13

    ..., Virginia 22041. FOR FURTHER INFORMATION CONTACT: CAPT Steven Knight, Designated Federal Officer, (703) 681-0608 (Voice), (703) 681-0002 (Facsimile), Email_ steven.p.knight.mil@mail.mil. Mailing address is... Captain Steven Knight, the Designated Federal Officer, not later than noon on Monday, September 30,...

  17. 75 FR 37410 - Privacy Act of 1974; System of Records

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-06-29

    ... 18, 2008; 73 FR 41338). CHANGES: * * * * * SYSTEM LOCATION: Delete entry and replace with ``Network... via the CAFRS Help Desk at cafrs.help@us.army.mil . All written inquiries should contain the full name... Desk at cafrs.help@us.army.mil . All written inquiries should contain the full name, Social...

  18. 40 CFR 721.9825 - Phenyl substituted triazolinones.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...-94-1871 through P-94-1874, EPA has approved North Safety Butyl Rubber gloves (32 mils thick). For P-93-204 and P-94-1870, EPA has approved North Safety Butyl Rubber gloves (32 mils thick) only if...

  19. 40 CFR 721.9825 - Phenyl substituted triazolinones.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...-94-1871 through P-94-1874, EPA has approved North Safety Butyl Rubber gloves (32 mils thick). For P-93-204 and P-94-1870, EPA has approved North Safety Butyl Rubber gloves (32 mils thick) only if...

  20. NASA Parts Project Office: Basic goals

    NASA Technical Reports Server (NTRS)

    Plante, Jeannette

    1994-01-01

    The topics are presented in viewgraph form and include the following: a standard part per MIL-STD-975; standard wire in MIL-STD-975; what is space grade, grade 1, and grade 2; conduit and catalyst for information transfer; NASA Interconnection Standardization Working Group; and present and past wire issues.

  1. 40 CFR 86.1910 - How must I prepare and test my in-use engines?

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... adjustments, as required by § 86.1925. You must send us these records, as described in § 86.1920(b)(3)(x), unless we instruct you not to send them. (b) You may treat a vehicle with an illuminated MIL or stored trouble code as follows: (1) If the length of MIL illumination or trouble code storage is consistent...

  2. 40 CFR 51.366 - Data analysis and reporting.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... receiving a waiver; and (vi) Vehicles with no known final outcome (regardless of reason). (vii)-(x) (xi... both the on-board diagnostic check and I/M gas cap evaporative system test (if applicable); (xix) MIL is commanded on and no codes are stored; (xx) MIL is not commanded on and codes are stored; (xxi)...

  3. 40 CFR 51.366 - Data analysis and reporting.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... receiving a waiver; and (vi) Vehicles with no known final outcome (regardless of reason). (vii)-(x) (xi... both the on-board diagnostic check and I/M gas cap evaporative system test (if applicable); (xix) MIL is commanded on and no codes are stored; (xx) MIL is not commanded on and codes are stored; (xxi)...

  4. 40 CFR 51.366 - Data analysis and reporting.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... receiving a waiver; and (vi) Vehicles with no known final outcome (regardless of reason). (vii)-(x) (xi... both the on-board diagnostic check and I/M gas cap evaporative system test (if applicable); (xix) MIL is commanded on and no codes are stored; (xx) MIL is not commanded on and codes are stored; (xxi)...

  5. 40 CFR 51.366 - Data analysis and reporting.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... receiving a waiver; and (vi) Vehicles with no known final outcome (regardless of reason). (vii)-(x) (xi... both the on-board diagnostic check and I/M gas cap evaporative system test (if applicable); (xix) MIL is commanded on and no codes are stored; (xx) MIL is not commanded on and codes are stored; (xxi)...

  6. 48 CFR 52.204-16 - Commercial and Government Entity Code Reporting.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... submitting a request at http://www.dlis.dla.mil/cage_welcome.asp. (3) The appropriate country codification....asp. (d) Additional guidance for establishing and maintaining CAGE codes is available at http://www.dlis.dla.mil/cage_welcome.asp. (e) When a CAGE Code is required for the immediate owner and/or...

  7. CO2-Selective Nanoporous Metal-Organic Framework Microcantilevers

    PubMed Central

    Yim, Changyong; Lee, Moonchan; Yun, Minhyuk; Kim, Gook-Hee; Kim, Kyong Tae; Jeon, Sangmin

    2015-01-01

    Nanoporous anodic aluminum oxide (AAO) microcantilevers are fabricated and MIL-53 (Al) metal-organic framework (MOF) layers are directly synthesized on each cantilever surface by using the aluminum oxide as the metal ion source. Exposure of the MIL53-AAO cantilevers to various concentrations of CO2, N2, CO, and Ar induces changes in their deflections and resonance frequencies. The results of the resonance frequency measurements for the different adsorbed gas molecules are almost identical when the frequency changes are normalized by the molecular weights of the gases. In contrast, the deflection measurements show that only CO2 adsorption induces substantial bending of the MIL53-AAO cantilevers. This selective deflection of the cantilevers is attributed to the strong interactions between CO2 and the hydroxyl groups in MIL-53, which induce structural changes in the MIL-53 layers. Simultaneous measurements of the resonance frequency and the deflection are performed to show that the diffusion of CO2 into the nanoporous MIL-53 layers occurs very rapidly, whereas the binding of CO2 to hydroxyl groups occurs relatively slowly, which indicates that the adsorption of CO2 onto the MIL-53 layers and the desorption of CO2 from the MIL-53 layers are reaction limited. PMID:26035805

  8. A receptor for interleukin 10 is related to interferon receptors.

    PubMed Central

    Ho, A S; Liu, Y; Khan, T A; Hsu, D H; Bazan, J F; Moore, K W

    1993-01-01

    We isolated cDNAs encoding a mouse interleukin 10 receptor (mIL-10R) from mouse mast cell and macrophage cell lines. The two cDNAs are substantially identical and express an approximately 110-kDa polypeptide in COS7 cells, which binds mIL-10 specifically. A mouse pro-B-cell line (Ba/F3) expressing transfected recombinant mIL-10R binds IL-10 with high affinity (approximately 70 pM) and proliferates in response to mIL-10. mIL-10R is structurally related to interferon receptors (IFNRs). Since IL-10 inhibits macrophage activation by IFN-gamma, a possible implication of this relationship interaction of IL-10R and IFN-gamma R or their signaling pathways. Images Fig. 1 Fig. 2 Fig. 4 PMID:8248239

  9. A Novel Multiple Instance Learning Method Based on Extreme Learning Machine

    PubMed Central

    Wang, Jie; Cai, Liangjian; Jia, Yuheng

    2015-01-01

    Since real-world data sets usually contain large instances, it is meaningful to develop efficient and effective multiple instance learning (MIL) algorithm. As a learning paradigm, MIL is different from traditional supervised learning that handles the classification of bags comprising unlabeled instances. In this paper, a novel efficient method based on extreme learning machine (ELM) is proposed to address MIL problem. First, the most qualified instance is selected in each bag through a single hidden layer feedforward network (SLFN) whose input and output weights are both initialed randomly, and the single selected instance is used to represent every bag. Second, the modified ELM model is trained by using the selected instances to update the output weights. Experiments on several benchmark data sets and multiple instance regression data sets show that the ELM-MIL achieves good performance; moreover, it runs several times or even hundreds of times faster than other similar MIL algorithms. PMID:25705220

  10. Dexterity testing of chemical-defense gloves. Technical report

    SciTech Connect

    Robinette, K.M.; Ervin; Zehner, G.F.

    1986-05-01

    Chemical-defense gloves (12.5-mil Epichlorohydron/Butyl, 14-mil Epichlorohydron/Butyl, and 7-mil Butyl with Nomex overgloves) were subjected to four dexterity tests (O'Connor Finger Dexterity Test, Pennsylvania Bi-Manual Worksample-Assembly, Minnesota Rate of Manipulation Turning, and the Crawford Small Test). Results indicated that subjects performances were most impaired by the 7-mil Butyl with Nomex overglove. Though differences between the other three gloved conditions were not always statistically significant, subjects performed silghtly better while wearing the Epichlorohydron/Butyl gloves, no matter which thickness, than they did while wearing the 15-mil butyl gloves. High negative correlation between anthropometry and gloved tests scores of subjects suggested that poor glove fit may also have affected subjects performances.

  11. Extraction of DNA by magnetic ionic liquids: tunable solvents for rapid and selective DNA analysis.

    PubMed

    Clark, Kevin D; Nacham, Omprakash; Yu, Honglian; Li, Tianhao; Yamsek, Melissa M; Ronning, Donald R; Anderson, Jared L

    2015-02-01

    DNA extraction represents a significant bottleneck in nucleic acid analysis. In this study, hydrophobic magnetic ionic liquids (MILs) were synthesized and employed as solvents for the rapid and efficient extraction of DNA from aqueous solution. The DNA-enriched microdroplets were manipulated by application of a magnetic field. The three MILs examined in this study exhibited unique DNA extraction capabilities when applied toward a variety of DNA samples and matrices. High extraction efficiencies were obtained for smaller single-stranded and double-stranded DNA using the benzyltrioctylammonium bromotrichloroferrate(III) ([(C8)3BnN(+)][FeCl3Br(-)]) MIL, while the dicationic 1,12-di(3-hexadecylbenzimidazolium)dodecane bis[(trifluoromethyl)sulfonyl]imide bromotrichloroferrate(III) ([(C16BnIM)2C12(2+)][NTf2(-), FeCl3Br(-)]) MIL produced higher extraction efficiencies for larger DNA molecules. The MIL-based method was also employed for the extraction of DNA from a complex matrix containing albumin, revealing a competitive extraction behavior for the trihexyl(tetradecyl)phosphonium tetrachloroferrate(III) ([P6,6,6,14(+)][FeCl4(-)]) MIL in contrast to the [(C8)3BnN(+)][FeCl3Br(-)] MIL, which resulted in significantly less coextraction of albumin. The MIL-DNA method was employed for the extraction of plasmid DNA from bacterial cell lysate. DNA of sufficient quality and quantity for polymerase chain reaction (PCR) amplification was recovered from the MIL extraction phase, demonstrating the feasibility of MIL-based DNA sample preparation prior to downstream analysis. PMID:25582771

  12. Adsorption of azo dyes from aqueous solution by the hybrid MOFs/GO.

    PubMed

    Li, Ling; Shi, Zhennan; Zhu, Hongyang; Hong, Wei; Xie, Fengwei; Sun, Keke

    2016-01-01

    In this work, a hybrid of chromium(III) terephthalate metal organic framework (MIL-101) and graphene oxide (GO) was synthesized and its performance in the removal of azo dyes (Amaranth, Sunset Yellow, and Carmine) from water was evaluated. The adsorption for azo dyes on MIL-101/GO was compared with that of MIL-101, and it was found that the addition of GO enhanced the stability of MIL-101 in water and increased the adsorption capacity. The maximum adsorption capacities of MIL-101/GO were 111.01 mg g(-1) for Amaranth, 81.28 mg g(-1) for Sunset Yellow, and 77.61 mg g(-1) for Carmine. The adsorption isotherms and kinetics were investigated, showing that the adsorption fits the Freundlich isotherm and the pseudo-second-order kinetic model. The recyclability of MIL-101/GO was shown by the regeneration by acetone. The high adsorption capability and excellent reusability make MIL-101/GO a competent adsorbent for the removal dyes from aqueous solution. PMID:27054746

  13. Insights on proximity effect and multiphoton induced luminescence from gold nanospheres in far field optical microscopy

    NASA Astrophysics Data System (ADS)

    Borglin, Johan; Guldbrand, Stina; Evenbratt, Hanne; Kirejev, Vladimir; Grnbeck, Henrik; Ericson, Marica B.

    2015-12-01

    Gold nanoparticles can be visualized in far-field multiphoton laser-scanning microscopy (MPM) based on the phenomena of multiphoton induced luminescence (MIL). This is of interest for biomedical applications, e.g., for cancer diagnostics, as MPM allows for working in the near-infrared (NIR) optical window of tissue. It is well known that the aggregation of particles causes a redshift of the plasmon resonance, but its implications for MIL applying far-field MPM should be further exploited. Here, we explore MIL from 10 nm gold nanospheres that are chemically deposited on glass substrates in controlled coverage gradients using MPM operating in NIR range. The substrates enable studies of MIL as a function of inter-particle distance and clustering. It was shown that MIL was only detected from areas on the substrates where the particle spacing was less than one particle diameter, or where the particles have aggregated. The results are interpreted in the context that the underlying physical phenomenon of MIL is a sequential two-photon absorption process, where the first event is driven by the plasmon resonance. It is evident that gold nanospheres in this size range have to be closely spaced or clustered to exhibit detectable MIL using far-field MPM operating in the NIR region.

  14. Alteration assemblages in the Miller Range and Elephant Moraine regions of Antarctica: Comparisons between terrestrial igneous rocks and Martian meteorites

    NASA Astrophysics Data System (ADS)

    Hallis, L. J.

    2013-02-01

    The weathering products present in igneous terrestrial Antarctic samples were analyzed, and compared with those found in the four Miller Range nakhlite Martian meteorites. The aim of these comparisons was to determine which of the alteration phases in the Miller Range nakhlites are produced by terrestrial weathering, and what effect rock composition has on these phases. Antarctic terrestrial samples MIL 05031 and EET 96400, along with the Miller Range nakhlites MIL 03346 and 090032, were found to contain secondary alteration assemblages at their externally exposed surfaces. Despite the difference in primary mineralogy, the assemblages of these rocks consist mostly of sulfates (jarosite in MIL 05031, jarosite and gypsum in EET 96400) and iddingsite-like Fe-clay. As neither of the terrestrial samples contains sulfur-bearing primary minerals, and these minerals are rare in the Miller Range nakhlites, it appears that SO42-, possibly along with some of the Na+, K+, and Ca+ in these phases, was sourced from wind-blown sea spray and biogenic emissions from the southern ocean. Cl enrichment in the terrestrially derived "iddingsite" of MIL 05031 and MIL 03346, and the presence of halite at the exterior edge of MIL 090032, can also be explained by this process. However, jarosite within and around the olivine-bound melt inclusions of MIL 090136 is present in the interior of the meteorite and, therefore, is probably the product of preterrestrial weathering on Mars.

  15. Signal set standardization for the aircraft-store electrical interconnection system

    NASA Astrophysics Data System (ADS)

    Lautner, D. E.; Perkins, J. R.

    1982-11-01

    The Air Force and Navy are conducting a joint program (Aircraft Armament Interoperable Interface A2I2) to standardize interfaces between aircraft and stores. One product of this joint A2I2 program is a military standard for the Aircraft-Store Electrical Interconnection System (AEIS). This standard, released in July 1981 as MIL-STD-1760, defines the electrical interface between aircraft and stores. As mentioned in the MIL-STD-1760 foreword, the complete AEIS is comprised of electrical, logical, and physical elements. The present MIL-STD-1760 issue addresses only the electrical signal set element. This paper provides an overview on the background for the selected MIL-STD-1760 electrical signal set. Following this overview, application restrictions, application guidelines and various technical issues are discussed for each of the power, digital, high bandwidth and discrete signals of MIL-STD-1760. The discussion covers the electrical signal set characteristics presently defined in MIL-STD-1760 plus clarifications and more rigorous definitions of the electrical signal characteristics expected in a future revision to MIL-STD-1760.

  16. Separation of styrene and ethylbenzene on metal-organic frameworks: analogous structures with different adsorption mechanisms.

    PubMed

    Maes, Michael; Vermoortele, Frederik; Alaerts, Luc; Couck, Sarah; Kirschhock, Christine E A; Denayer, Joeri F M; De Vos, Dirk E

    2010-11-01

    The metal-organic frameworks MIL-47 (V(IV)O{O(2)C-C(6)H(4)-CO(2)}) and MIL-53(Al) (Al(III)(OH)·{O(2)C-C(6)H(4)-CO(2)}) are capable of separating ethylbenzene and styrene. Both materials adsorb up to 20-24 wt % of both compounds. Despite the fact that they have identical building schemes, the reason for preferential adsorption of styrene compared to ethylbenzene is very different for the two frameworks. For MIL-47, diffraction experiments reveal that styrene is packed inside the pores in a unique, pairwise fashion, resulting in separation factors as high as 4 in favor of styrene. These separation factors are independent of the total amount of adsorbate offered. This is due to co-adsorption of ethylbenzene in the space left available between the packed styrene pairs. The separation is of a non-enthalpic nature. On MIL-53, the origin of the preferential adsorption of styrene is related to differences in enthalpy of adsorption, which are based on different degrees of framework relaxation. The proposed adsorption mechanisms are in line with the influence of temperature on the separation factors derived from pulse chromatography: separation factors are independent of temperature for MIL-47 but vary with temperature for MIL-53. Finally, MIL-53 is also capable of removing typical impurities like o-xylene or toluene from styrene-ethylbenzene mixtures. PMID:20942418

  17. Superior performance of metal-organic frameworks over zeolites as solid acid catalysts in the Prins reaction: green synthesis of nopol.

    PubMed

    Opanasenko, Maksym; Dhakshinamoorthy, Amarajothi; Hwang, Young Kyu; Chang, Jong-San; Garcia, Hermenegildo; Čejka, Jiří

    2013-05-01

    The catalytic performance of a set of metal-organic frameworks [CuBTC, FeBTC, MIL-100(Fe), MIL-100(Cr), ZIF-8, MIL-53(Al)] was investigated in the Prins condensation of β-pinene with formaldehyde and compared with the catalytic behavior of conventional aluminosilicate zeolites BEA and FAU and titanosilicate zeolite MFI (TS-1). The activity of the investigated metal-organic frameworks (MOFs) increased with the increasing concentration of accessible Lewis acid sites in the order ZIF-8<MIL-53(Al)MIL-100(Cr)<MIL-100(Fe). Unwanted β-pinene-like isomerization takes place on the strong Brønsted acid sites of zeolites BEA and FAU, which showed significantly lower selectivity to the target nopol than the MOFs. Its high activity, the preservation of its structure and active sites, and the possibility to use it in at least three catalytic cycles without loss of activity make MIL-100 (Fe) the best performing catalyst of the series for the Prins condensation of β-pinene and paraformaldehyde. Our report exemplifies the advantages of MOFs over zeolites as solid catalysts in liquid-phase reactions for the production of fine chemicals. PMID:23592600

  18. Metal-organic frameworks as hosts for photochromic guest molecules.

    PubMed

    Hermann, D; Emerich, H; Lepski, R; Schaniel, D; Ruschewitz, U

    2013-03-01

    Several metal-organic framework compounds (MOF-5, MIL-68(Ga), MIL-68(In), MIL-53(Al)) were loaded with azobenzene (AZB), as confirmed by XRPD measurements and elemental analysis. By IR spectroscopy, it was shown that the light-induced trans/cis isomerization of AZB in these hybrid host-guest compounds is improved compared to that of solid AZB. A population of the excited cis state up to 30% has been obtained for AZB0.66@MIL-68(In). However, no light-induced trans/cis isomerization was observed for AZB0.5@MIL-53(Al). Structural models obtained from high-resolution synchrotron powder diffraction data show that AZB molecules are densely packed within the channels of MIL-53(Al) so that no trans/cis isomerization can occur. A different situation was observed for AZB in the larger channels of MIL-68(Ga). Thus, this investigation shows the influence of the host material on the switching behavior of the embedded AZB molecules. PMID:23409796

  19. Insights on proximity effect and multiphoton induced luminescence from gold nanospheres in far field optical microscopy

    SciTech Connect

    Borglin, Johan; Guldbrand, Stina; Evenbratt, Hanne; Kirejev, Vladimir; Ericson, Marica B.; Grönbeck, Henrik

    2015-12-07

    Gold nanoparticles can be visualized in far-field multiphoton laser-scanning microscopy (MPM) based on the phenomena of multiphoton induced luminescence (MIL). This is of interest for biomedical applications, e.g., for cancer diagnostics, as MPM allows for working in the near-infrared (NIR) optical window of tissue. It is well known that the aggregation of particles causes a redshift of the plasmon resonance, but its implications for MIL applying far-field MPM should be further exploited. Here, we explore MIL from 10 nm gold nanospheres that are chemically deposited on glass substrates in controlled coverage gradients using MPM operating in NIR range. The substrates enable studies of MIL as a function of inter-particle distance and clustering. It was shown that MIL was only detected from areas on the substrates where the particle spacing was less than one particle diameter, or where the particles have aggregated. The results are interpreted in the context that the underlying physical phenomenon of MIL is a sequential two-photon absorption process, where the first event is driven by the plasmon resonance. It is evident that gold nanospheres in this size range have to be closely spaced or clustered to exhibit detectable MIL using far-field MPM operating in the NIR region.

  20. Structurally stable, thin silicon solar cells

    NASA Astrophysics Data System (ADS)

    Arndt, R. A.; Meulenberg, A.

    A fabrication process for structurally stable thin solar cell wafers that produce good power output after irradiation is described. The fabrication process is as follows. A 6 mil, circular wafer is oxidized on both sides. One side is then patterned with a rectangular array of holes in the oxide that are nominally 75 mils square and separated by 2 mil spacings. Wells are then etched into the silicon with KOH to a depth of 4 mils, leaving a 2 mil, unetched thickness. Two areas on the surface are left unetched to provide pads for bonding or testing. All oxide is then removed and the rest of the processing is normal; the unetched face is used as the illuminated face. When all other processing is complete, a 2 X 2 cm cell is sawed from the starting wafer leaving a border that is approximately 10 mils wide. The effective thickness, determined by weighing an unmetallized sample, of such a cell is about 2.4 mil.

  1. Interleukin-21 administration leads to enhanced antigen-specific T cell responses and natural killer cells in HIV-1 vaccinated mice.

    PubMed

    Ju, Bin; Li, Dan; Ji, Xiaolin; Liu, Jiandong; Peng, Hong; Wang, Shuo; Liu, Ying; Hao, Yanling; Yee, Cassian; Liang, Hua; Shao, Yiming

    2016-05-01

    Interleukin-21 (IL-21), which belongs to IL-2 γ chain receptor cytokine family, is as an important regulator of immune responses. In this study, we developed a novel strategy for immunizing mice with a DNA/vaccinia/protein vaccine in the presence or absence of mouse IL-21 (mIL-21) to evaluate whether mIL-21 could enhance immune responses. Our results demonstrated that co-immunization with mIL-21 did not increase significantly the capacity of vaccine induced antibodies to bind to HIV-1 GP140. An effect of mIL-21 in adjusting the efficacy of HIV-1 vaccine through enhancing Th1 type immune response was however observed. The frequencies of HIV-1-specific cytokine-producing CD4+ T and CD4+ TEM cells, especially multifunctional T cell responses, were significantly increased by co-administrating with mIL-21. A significant increase was also observed in the frequency of NK cells in mIL-21 adjuvant groups. Taken together, combination of mIL-21 with HIV-1 vaccines led to distinct enhancement of NK cells and T cell immune responses associated with immune protection. PMID:27062692

  2. Mesospheric Inversion Layers at Chatanika, Alaska (65°N, 147°W): Rayleigh lidar observations and analysis

    NASA Astrophysics Data System (ADS)

    Irving, Brita K.; Collins, Richard L.; Lieberman, Ruth S.; Thurairajah, Brentha; Mizutani, Kohei

    2014-10-01

    Rayleigh lidar observations at Poker Flat Research Range, Chatanika, Alaska (65°N, 147°W), have yielded density and temperature measurements from 40 km to 80 km. These measurements have been made under clear skies at night between November 1997 and May 2009. We have identified and characterized 79 Mesospheric Inversion Layers (MILs) in the 40-70 km altitude region on 56 of 117 nights of observations between August and May. These 79 MILs have an average amplitude of 13 K, peak altitude of 61 km, topside lapse rate of 6 K/km, depth or thickness of 3 km, base altitude of 58 km, bottomside gradient of 5 K/km, and downward vertical velocity of 0.1 km/h based on the 2 h temperature profiles. MILs occur with a nightly occurrence rate of 48%, more frequently than previously reported at Arctic sites, but less frequently than at lower latitude sites. MILs are embedded in the larger planetary wave structure. MILs are found to occur most commonly in January as has been reported from lower latitude sites. We find that the planetary wave-1 amplitudes are a factor 1.3 larger at an altitude of 5.0-6.5 scale heights (~32-39 km) on days when MILs are observed than when they are not observed. The planetary wave-2 amplitudes are not significantly different when MILs are present and absent. We find that Eliassen-Palm flux divergences at an altitude of 7-8 scale height (~45-52 km) are a factor 2.0 larger on nights when MILs are observed than when they are not observed. We also find that gravity wave potential energy densities are a factor 1.3 larger on nights when MILs are observed than on nights when they are not observed.

  3. Earth Observing System/Advanced Microwave Sounding Unit-A (EOS/AMSU-A): Developer derating policy

    NASA Technical Reports Server (NTRS)

    Maciel, Roberto M.

    1994-01-01

    The derating requirements/factors tabulated in Appendix B of the Goddard Space Flight Center Preferred Parts List (GSFC PPL) and Appendix A of MIL-STD-975 (NASA Standard Electrical, Electronic and Electromechanical (EEE) Parts List) should be used. Where differences occur, the PPL derating factors should have precedence over the derating factors of MIL-STD-975. When a derating factor is not provided in either the PPL or MIL-STD-975, the GSFC EOS Parts Branch Specialist should be consulted. In addition, the Performance Assurance Requirement (PAR) stipulates that all piece parts shall function at or above twice the expected ionizing radiation dose.

  4. High pressure pulsed capillary viscometry

    NASA Technical Reports Server (NTRS)

    Smith, R. L.; Walowitt, J. A.; Pan, C. H. T.

    1972-01-01

    An analytical and test program was conducted in order to establish the feasibility of a multichamber pulsed-capillary viscometer. The initial design incorporated a piston, ram, and seals which produced measured pulses up to 30,000 psi in the closed chamber system. Pressure pulses from one to ten milliseconds were investigated in a system volume of 1 cuin. Four test fluids: a MIL-L-7808, a 5P4E polyphenyl ether, a MIL-L-23699A, and a synthetic hydrocarbon were examined in the test pressure assembly. The pressure-viscosity coefficient and viscosity delay time were determined for the MIL-L-7808 lubricant tested.

  5. Tutorial: Test tailoring and the environmental engineering specialist

    SciTech Connect

    Caruso, H.J.

    1987-01-01

    These notes provide an overview of environmental test tailoring with particular emphasis on test tailoring as described in MIL-STD-810D and other tailoring documents. The critical role of the Environmental Engineering Specialist in the tailoring process is examined and includes discussions on how MIL-STD-810D supports current Department of Defense acquisition policies; the significant new technical and administrative features of MIL-STD-810D; how specific tailorable test methods compare with more traditional test methodologies; tailoring for environmental reliability testing and environmental stress screening; potential impacts on program costs, schedules, and existing laboratory test facilities; background rationale for specific test methodologies.

  6. Inclusion of thiazyl radicals in porous crystalline materials.

    PubMed

    Potts, Storm V; Barbour, Leonard J; Haynes, Delia A; Rawson, Jeremy M; Lloyd, Gareth O

    2011-08-24

    The incorporation of benzodithiazolyl (BDTA) and methylbenzodithiazolyl (MBDTA) radicals into porous hybrid frameworks via gas phase diffusion revealed that inclusion appeared selective for the MIL53(Al) framework against a range of other potential hosts. Both PXRD and EPR studies are consistent with retention of a π*-π* dimer motif for BDTA in MIL53(Al)@BDTA whereas MBDTA in MIL53(Al)@MBDTA appears to be monomeric. The guests are readily released by the addition of solvent (CH(2)Cl(2)). PMID:21776993

  7. Experimental Evidence Supported by Simulations of a Very High H{sub 2} Diffusion in Metal Organic Framework Materials

    SciTech Connect

    Salles, F.; Maurin, G.; Jobic, H.; Koza, M. M.; Llewellyn, P. L.; Devic, T.; Serre, C.; Ferey, G.

    2008-06-20

    Quasielastic neutron scattering measurements are combined with molecular dynamics simulations to extract the self-diffusion coefficient of hydrogen in the metal organic frameworks MIL-47(V) and MIL-53(Cr). We find that the diffusivity of hydrogen at low loading is about 2 orders of magnitude higher than in zeolites. Such a high mobility has never been experimentally observed before in any nanoporous materials, although it was predicted in carbon nanotubes. Either 1D or 3D diffusion mechanisms are elucidated depending on the chemical features of the MIL framework.

  8. 32 CFR 260.5 - Responsibilities.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... the Randolph-Sheppard Act (20 U.S.C. 107) and the implementing regulations (34 CFR part 395). 1 Available from http://www.dtic.mil/whs/directives/corres/html/416570.htm. (5) The On-Site Official shall...

  9. 32 CFR 232.5 - Identification of covered borrower.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... information available at http://www.dmdc.osd.mil/mla/owa/home. Searches require the service member's full name, Social Security number, and date of birth. (d) This part shall not apply to a consumer credit...

  10. 76 FR 4532 - Safety Zone; 500 Yards North and South, Bank to Bank, of Position 29°48.77′ N 091°33.02′ W...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-01-26

    ... rule, call or e-mail Lieutenant (LT) Russell Pickering, Coast Guard; telephone 985-380-5334, e-mail russell.t.pickering@uscg.mil . If you have questions on viewing the docket, call Renee V. Wright,...

  11. Radiocarbon Signatures and Cycling of Dissolved Organic Carbon in the World Ocean

    NASA Astrophysics Data System (ADS)

    Druffel, E. R.; Griffin, S.; Walker, B. D.

    2012-12-01

    Radiocarbon (Delta14C) measurements of bulk dissolved organic carbon (DOC) in the deep ocean range from -390 per mil in the North Atlantic to -550 per mil in the Northeast Pacific. We report Delta14C measurements of DOC from six sites in the South Pacific and three sites in the South Atlantic collected on Repeat Hydrography cruises P6 (2010) and A10 (2011). We compare our new results with those reported earlier for the North central Pacific, Northeast Pacific, Southern Ocean and Sargasso Sea. We find that the Delta14C results from the deep South Pacific are lower than expected, given the range between Southern Ocean DOC Delta14C values (-500 per mil) and those from the North central Pacific (-525 per mil). Implications for DOC cycling in the world ocean are presented.

  12. 46 CFR 160.035-1 - Applicable specifications.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... Commission: 47 CFR part 83, Rules Governing Stations on Shipboard in the Maritime Service. (6) Coast Guard..., Polyester, Low Pressure Laminating, Fire Retardant. MIL-P-21929—Plastic Material, Cellular...

  13. 46 CFR 164.018-5 - Specifications and standards incorporated by reference.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... “Sheeting and Tape, Reflective: Nonexposed Lens, Adhesive Backing.” (3) Federal Specification CCC-C-426 D... Specification MIL-C-43006 E (March 24, 1978), entitled “Cloth and Strip Laminated, Vinyl Nylon High...

  14. 76 FR 22681 - Defense Logistics Agency (DLA) Address Directory

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-04-22

    ... benefits the public in advising them where to send requests for review. DLA FOIA/Privacy Points of Contact are found at: http://www.dla.mil/foia-privacy/foia_poc.aspx . FOR FURTHER INFORMATION CONTACT:...

  15. 40 CFR Appendix III to Subpart S... - As-Received Inspection

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...) General Compliance Provisions for Control of Air Pollution From New and In-Use Light-Duty Vehicles, Light... Reading 7. Build Date 8. MIL light on/off status 9. Readiness code status 10. Stored OBD codes...

  16. A reconnaissance of the boron isotopic composition of tourmaline

    SciTech Connect

    Swihart, G.H.; Moore, P.B. )

    1989-04-01

    A preliminary investigation of the boron isotopic composition of tourmaline from some boron-rich associations has been made. The results for tourmaline from metasedimentary paragneisses (n = 12) range from {delta}{sup 11}B = {minus}22 to +22 per mil. These data mainly fall between the boron isotopic compositions of normal marine sediments with {delta}{sup 11}B = {minus}2 to +5 per mil and seawater with {delta}{sup 11}B = +39.5 per mil. Tourmaline samples from granitic pegmatites (n = 6), on the other hand, range from {delta}{sup 11}B = {minus}12 to {minus}5 per mil. The data provide a rudimentary indication of the range of boron isotopic variation in tourmaline, some of the processes leading to this range, and some possible geochemical tracer applications.

  17. 76 FR 31307 - Notice of Intent To License Government-Owned Inventions; Intent To License Exclusively

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-05-31

    ....mcgill@us.army.mil , US Army Edgewood Chemical Biological Center (ECBC), AMSRD-ECB-PI-BP-TT, Bldg E3330... Research and Technology Applications, US Army Edgewood Chemical Biological Center, AMSRD-ECB-PI-BP-TT,...

  18. 32 CFR 213.1 - Purpose.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... NON-FEDERAL ENTITIES AUTHORIZED TO OPERATE ON DOD INSTALLATIONS § 213.1 Purpose. (a) Authorizes 32 CFR....mil/whs/directives/. (1) For DoD support to the Boy Scouts of America (BSA) and Girl Scouts of...

  19. 32 CFR 213.1 - Purpose.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... NON-FEDERAL ENTITIES AUTHORIZED TO OPERATE ON DOD INSTALLATIONS § 213.1 Purpose. (a) Authorizes 32 CFR....mil/whs/directives/. (1) For DoD support to the Boy Scouts of America (BSA) and Girl Scouts of...

  20. 32 CFR 213.1 - Purpose.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... NON-FEDERAL ENTITIES AUTHORIZED TO OPERATE ON DOD INSTALLATIONS § 213.1 Purpose. (a) Authorizes 32 CFR....mil/whs/directives/. (1) For DoD support to the Boy Scouts of America (BSA) and Girl Scouts of...

  1. 32 CFR 213.1 - Purpose.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... NON-FEDERAL ENTITIES AUTHORIZED TO OPERATE ON DOD INSTALLATIONS § 213.1 Purpose. (a) Authorizes 32 CFR....mil/whs/directives/. (1) For DoD support to the Boy Scouts of America (BSA) and Girl Scouts of...

  2. 32 CFR 239.15. - List of HAP Field Offices.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... Oglethorpe Avenue, Savannah, Georgia 31401-3604, 1-800-861-8144, Internet Address: http://www.sas.usace.army.mil. HAP CENTRAL OFFICE Homeowners Assistance Program, HQ U.S. Army Corps of Engineers Real...

  3. 32 CFR 239.15. - List of HAP Field Offices.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... Oglethorpe Avenue, Savannah, Georgia 31401-3604, 1-800-861-8144, Internet Address: http://www.sas.usace.army.mil. HAP CENTRAL OFFICE Homeowners Assistance Program, HQ U.S. Army Corps of Engineers Real...

  4. 47 CFR 17.53 - Lighting equipment and paint.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... orange, enamel TT-E-489 1 (Color No. 12197, FS-595). Aviation red obstruction light—color MIL-C-25050 2... specification can be obtained from the Specification Activity, Building 197, Room 301, Naval Weapons Plant,...

  5. 47 CFR 17.53 - Lighting equipment and paint.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... orange, enamel TT-E-489 1 (Color No. 12197, FS-595). Aviation red obstruction light—color MIL-C-25050 2... specification can be obtained from the Specification Activity, Building 197, Room 301, Naval Weapons Plant,...

  6. 47 CFR 17.53 - Lighting equipment and paint.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... orange, enamel TT-E-489 1 (Color No. 12197, FS-595). Aviation red obstruction light—color MIL-C-25050 2... specification can be obtained from the Specification Activity, Building 197, Room 301, Naval Weapons Plant,...

  7. 47 CFR 17.53 - Lighting equipment and paint.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... orange, enamel TT-E-489 1 (Color No. 12197, FS-595). Aviation red obstruction light—color MIL-C-25050 2... specification can be obtained from the Specification Activity, Building 197, Room 301, Naval Weapons Plant,...

  8. 75 FR 24799 - Special Local Regulation for Marine Events; Temporary Change of Dates for Recurring Marine Events...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-05-06

    ..., Waterways Management Division, United States Coast Guard; telephone (757) 668-5580, e-mail Tiffany.A.Duffy@uscg.mil . SUPPLEMENTARY INFORMATION: In FR doc 2010-8861 appearing on page 20294 in the issue...

  9. Find a Doctor

    MedlinePlus

    ... File a Complaint Secure Login Email Us Report Fraud or Abuse For Providers TRICARE Provider Types What ... and Branding Program Privacy Policy Accessibility/Section 508 Fraud & Abuse FOIA USA.gov www.tricare.mil is ...

  10. TRICARE, Military Health System

    MedlinePlus

    ... File a Complaint Secure Login Email Us Report Fraud or Abuse For Providers TRICARE Provider Types What ... and Branding Program Privacy Policy Accessibility/Section 508 Fraud & Abuse FOIA USA.gov www.tricare.mil is ...

  11. 48 CFR 225.7401 - Contracts requiring performance or delivery in a foreign country.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...://www.eur.army.mil/g1/content/CPD/docper.html (c) For work performed in Japan or Korea, see PGI 225.7401(c) for information on bilateral agreements and policy relating to contractor employees in Japan...

  12. 48 CFR 9.203 - QPL's, QML's, and QBL's.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... and Standardization Information System (ASSIST) at (https://assist.dla.mil/online/start/). (c... Standardization Manual, FSPM-0001. (2) Defense Standardization Manual 4120.24-M, Appendix 2, as amended...

  13. Stable-isotope ratios of hydrogen and oxygen in precipitation at Norman, Oklahoma, 1996-2008

    USGS Publications Warehouse

    Jaeschke, Jeanne B.; Scholl, Martha A.; Cozzarelli, Isabelle M.; Masoner, Jason R.; Christenson, Scott; Qi, Haiping

    2011-01-01

    Precipitation samples for measurement of stable-isotope ratios of hydrogen (delta2H) and oxygen (delta18O) were collected at the Norman Landfill Research Site in Norman, Oklahoma, from May 1996 to October 2008. Rainfall amounts also were measured at the site (U.S. Geological Survey gaging station 07229053) during the collection period. The delta2H of precipitation samples ranged from -121.9 to +8.3 per mil, and the delta18O of precipitation ranged from -16.96 to +0.50 per mil. The volume-weighted average values for delta2H and delta18O of precipitation over the 12-year measurement period were -31.13 per mil for delta2H and -5.57 per mil for delta18O. Average summer-season delta2H and delta18O values of precipitation usually were more positive (enriched in the heavier isotopes) than winter values.

  14. Development of Protective Coatings for Chromium-Base Alloys

    NASA Technical Reports Server (NTRS)

    English, J. J.; MacMillan, C. A.; Williams, D. N.; Bartlett, E. S.

    1966-01-01

    Chromium alloy sheet was clad with 5 to 10-mil-thick oxidation-resistant nickel-base alloy foils. Specimens also contained 1/2 to 1-mil-thick intermediate layers of platinum, tungsten, and/or W-25Re. Cladding was done by the isostatic hot gas-pressure bonding,.process. The clad chromium-alloy specimens were cyclic oxidation tested at 2100 F and 2300 F for up to 200 hours to determine the effectiveness of these metal claddings in protecting the chromium alloy Cr-5W from oxidation and contamination. Cladding systems consisting of 5-mil-thick Ni-20Cr-20W modified with 3 to 5 weight percent aluminum and containing a 1 /2-mil tungsten diffusion barrier demonstrated potential for long-time service at temperatures as high as 2300 F.

  15. Iron isotope biosignatures.

    PubMed

    Beard, B L; Johnson, C M; Cox, L; Sun, H; Nealson, K H; Aguilar, C

    1999-09-17

    The (56)Fe/(54)Fe of Fe-bearing phases precipitated in sedimentary environments varies by 2.5 per mil (delta(56)Fe values of +0.9 to -1. 6 per mil). In contrast, the (56)Fe/(54)Fe of Fe-bearing phases in igneous rocks from Earth and the moon does not vary measurably (delta(56)Fe = 0.0 +/- 0.3 per mil). Experiments with dissimilatory Fe-reducing bacteria of the genus Shewanella algae grown on a ferrihydrite substrate indicate that the delta(56)Fe of ferrous Fe in solution is isotopically lighter than the ferrihydrite substrate by 1.3 per mil. Therefore, the range in delta(56)Fe values of sedimentary rocks may reflect biogenic fractionation, and the isotopic composition of Fe may be used to trace the distribution of microorganisms in modern and ancient Earth. PMID:10489362

  16. 76 FR 73510 - Drawbridge Operation Regulations; Saugus River, Lynn and Revere, MA

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-11-29

    ...''. They are also available for inspection or copying at the Docket Management Facility (M-30), U.S..., First Coast Guard District, john.w.mcdonald@uscg.mil , or telephone (617) 223-8364. If you...

  17. 75 FR 20775 - Drawbridge Operation Regulations; Hampton River, Hampton, NH, Maintenance

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-04-21

    ... Management Facility (M-30), U.S. Department of Transportation, West Building Ground Floor, Room W12-140, 1200....w.mcdonald@uscg.mil . If you have questions on viewing the docket, call Renee V. Wright,...

  18. 76 FR 4817 - Drawbridge Operation Regulations; Chelsea River, Chelsea and East Boston, MA

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-01-27

    ... the Docket Management Facility (M-30), U.S. Department of Transportation, West Building Ground Floor...) 223-8364, john.w.mcdonald@uscg.mil . If you have questions on viewing the docket, call Renee V....

  19. 76 FR 3516 - Drawbridge Operation Regulations; Merrimack River, Newburyport and Salisbury, MA

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-01-20

    ... copying at the Docket Management Facility (M-30), U.S. Department of Transportation, West Building Ground....mcdonald@uscg.mil , or telephone (617) 223-8364. If you have questions on viewing the docket, call Renee...

  20. 78 FR 29646 - Drawbridge Operation Regulations; Merrimack River, Haverhill and West Newbury, MA

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-05-21

    ... available for inspection or copying at the Docket Management Facility (M-30), U.S. Department of... Guard District, john.w.mcdonald@uscg.mil or telephone (617) 223-8364. If you have questions on...