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1

NQR study of chalcogenide glasses Ge-As-Se.  

PubMed

A three-component Ge-As-Se system is studied by the nuclear quadrupole resonance (NQR) method on (75)As nuclei and by the nutation NQR spectroscopy. The NQR (75)As spectra of the glasses Ge(0.021) As(0.375) Se(0.604), Ge(0.043) As(0.348) Se(0.609) and Ge(0.068) As(0.318) Se(0.614) reveal broad lines with two peaks assigned to the main structural unit of As(2)Se(3). With increasing average coordination number ( ?r), the spectrum signals are shifted towards higher frequencies. At ?r > 2.54, the spectrum becomes complex, which is a consequence of formation of more complex molecular structures in the glasses of high content of germanium. At fixed frequencies the asymmetry parameter ? of the samples studied is determined. PMID:21452350

Glotova, Olga; Korneva, Irina; Sinyavsky, Nikolay; Ostafin, Michal; Nogaj, Boleslaw

2011-07-01

2

NQR Study of Dynamics in Incommensurate Phases  

NASA Astrophysics Data System (ADS)

Dynamic processes in solids exhibiting structurally incommensurate phases are briefly reviewed, and the application of NMR and NQR is discussed. The unique utility of these methods, - arising due to, on one hand, the microscopic resonant nature of the probe used and, on the other, the presence of periodic, though incommensurable, structure - , is brought out by presenting recent results in a prototype system (Rb2ZnCl4) in the presence of randomly quenched disorder. In particular, the interesting new methodology of measuring, by analysing NQR spin echo modulation, ultra-slow diffusion like collective motions of ensembles of atoms in the presence of pinning effects due to disorder is illustrated with new results.

Sastry, V. S. S.; Venu, K.; Maheswari, S. Uma; Subramanian, R. K.

2000-02-01

3

Application of 14N NQR to the study of piroxicam polymorphism.  

PubMed

A study was conducted to test the capability of the (14)N nuclear quadrupole resonance (NQR) method to discriminate qualitatively and quantitatively among different forms of piroxicam. Samples of commercial piroxicam form I and its monohydrate were obtained on the local market. Additionally, samples of form I and II were prepared by recrystallization in 1,2-dichloroethane and ethanol, respectively. DSC and FT-IR were employed as reference methods. A (14)N NQR spectrometer was used to measure samples of different forms and mixtures of piroxicam at 2587 and 3439 ?kHz. DSC and FT-IR clearly confirmed differences between the different piroxicam forms. Measurements of (14)N NQR signals of different forms of piroxicam at 2587 ?kHz detected only spectral peaks of form I. The dependence of (14)N NQR signal intensity on the concentration of form I in mixtures with the monohydrate showed a clear linear relationship at both measured frequencies, though the scattering of data was greater at 3439 ?kHz due to the lower S/N ratio. The (14)N NQR method has the potential to become an additional and important spectroscopic tool in the study of solid-state forms, not only of pure active pharmaceutical ingredients or excipients, but also of their mixtures. This ability lends the method to a possible successful utilization at different levels of pharmaceutical manufacturing and product quality control. PMID:20597116

Lavri?, Zoran; Pirnat, Janez; Lužnik, Janko; Seliger, Janez; Zagar, Veselko; Trontelj, Zvonko; Sr?i?, Stane

2010-12-01

4

Solid-State NMR/NQR and First-Principles Study of Two Niobium Halide Cluster Compounds  

E-print Network

1 Solid-State NMR/NQR and First-Principles Study of Two Niobium Halide Cluster Compounds Berislav : 10.1016/j.ssnmr.2014.02.001 #12;2 Abstract Two hexanuclear niobium halide cluster compounds solid-state NMR/NQR techniques and PAW/GIPAW calculations. For niobium sites the NMR parameters were

Boyer, Edmond

5

A computational NQR study on the hydrogen-bonded lattice of cytosine-5-acetic acid.  

PubMed

A computational study at the level of density functional theory (DFT) employing 6-311++G** standard basis set was carried out to evaluate nuclear quadrupole resonance (NQR) spectroscopy parameters in cytosine-5-acetic acid (C5AA). Since the electric field gradient (EFG) tensors are very sensitive to the electrostatic environment at the sites of quadruple nuclei, the most possible interacting molecules with the target one were considered in a five-molecule model system of C5AA using X-ray coordinates transforming. The hydrogen atoms positions were optimized and two model systems of original and H-optimized C5AA were considered in NQR calculations. The calculated EFG tensors at the sites of (17)O, (14)N, and (2)H nuclei were converted to their experimentally measurable parameters, quadrupole coupling constants and asymmetry parameters. The evaluated NQR parameters reveal that the nuclei in original and H-optimized systems contribute to different hydrogen bonding (HB) interaction. The comparison of calculated parameters between optimized isolated gas-phase and crystalline monomer also shows the relationship between the structural deformation and NQR parameters in C5AA. The basis set superposition error (BSSE) calculations yielded no significant errors for employed basis set in the evaluation of NQR parameters. All the calculations were performed by Gaussian 98 package of program. PMID:17926341

Mirzaei, Mahmoud; Hadipour, Nasser L

2008-04-15

6

Copper valence, structural separation and lattice dynamics in tennantite (fahlore): NMR, NQR and SQUID studies  

NASA Astrophysics Data System (ADS)

Electronic and magnetic properties of tennantite subfamily of tetrahedrite-group minerals have been studied by copper nuclear quadrupole resonance (NQR), nuclear magnetic resonance (NMR) and SQUID magnetometry methods. The temperature dependences of copper NQR frequencies and line-width, nuclear spin-lattice relaxation rate T {1/-1} and nuclear spin-echo decay rate T {2/-1} in tennantite samples in the temperature range 4.2-210 K is evidence of the presence of field fluctuations caused by electronic spins hopping between copper CuS3 positions via S2 bridging atom. The analysis of copper NQR data at low temperatures points to the magnetic phase transition near 65 K. The magnetic susceptibility in the range 2-300 K shows a Curie-Weiss behavior, which is mainly determined by Fe2+ paramagnetic substituting ions.

Gainov, R. R.; Dooglav, A. V.; Pen'kov, I. N.; Mukhamedshin, I. R.; Savinkov, A. V.; Mozgova, N. N.

2008-01-01

7

Methyl quantum tunneling and nitrogen-14 NQR NMR studies using a SQUID magnetic resonance spectrometer  

SciTech Connect

Nuclear Magnetic Resonance (NMR) and Nuclear Quadrupole Resonance (NQR) techniques have been very successful in obtaining molecular conformation and dynamics information. Unfortunately, standard NMR and NQR spectrometers are unable to adequately detect resonances below a few megahertz due to the frequency dependent sensitivity of their Faraday coil detectors. For this reason a new spectrometer with a dc SQUID (Superconducting Quantum Interference Device) detector, which has no such frequency dependence, has been developed. Previously, this spectrometer was used to observe {sup 11}B and {sup 27}Al NQR resonances. The scope of this study was increased to include {sup 23}Na, {sup 51}V, and {sup 55}Mn NQR transitions. Also, a technique was presented to observe {sup 14}N NQR resonances through cross relaxation of the nitrogen polarization to adjacent proton spins. When the proton Zeeman splitting matches one nitrogen quadrupoler transition the remaining two {sup 14}N transitions can be detected by sweeping a saturating rf field through resonance. Additionally, simultaneous excitation of two nitrogen resonances provides signal enhancement which helps to connect transitions from the same site. In this way, nitrogen-14 resonances were observed in several amino acids and polypeptides. This spectrometer has also been useful in the direct detection of methyl quantum tunneling splittings at 4.2 K. Tunneling, frequencies of a homologous series of carboxylic acids were measured and for solids with equivalent crystal structures, an exponential correlation between the tunneling frequency and the enthalpy of fusion is observed. This correlation provides information about the contribution of intermolecular interactions to the energy barrier for methyl rotation.

Black, B.E. [Univ. of California, Berkeley, CA (United States). Dept. of Chemistry]|[Lawrence Berkeley Lab., CA (United States)

1993-07-01

8

Defective BN Nanotubes: A Density Functional Theory Study of B-11 and N-14 NQR Parameters  

NASA Astrophysics Data System (ADS)

A density functional theory (DFT) study is performed to investigate the influence of structural defects on the electronic structure properties of perfect boron nitride nanotubes (BNNTs). To this aim, as representative models, the single-walled (6,0) BNNT consisting of 36 boron, 36 nitrogen, and 12 hydrogen atoms and the single-walled (4,4) BNNT consisting of 36 boron, 36 nitrogen, and 16 hydrogen atoms are considered. The nuclear quadrupole resonance (NQR) parameters are calculated and compared in two perfect and defective models of the considered BNNTs. The results indicate that due to formation of non-hexagonal rings in the defective model because of removing a B-N bond, the NQR parameters at the sites of first neighbouring nuclei are significantly influenced by imposed perturbation, however, the sites of other nuclei, farther from perturbation, remain almost unchanged. The calculations are performed at the level of the BLYP method and 6-31G* standard basis set using the GAUSSIAN 98 package

Giahi, Masoud; Mirzaei, Mahmoud

2009-04-01

9

93Nb- and 27Al-NMR/NQR studies of the praseodymium based PrNb2Al20  

NASA Astrophysics Data System (ADS)

We report a study of 93Nb- and 27Al-nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) in a praseodymium based compound PrNb2Al20. The observed NMR line at around 3 T and 30 K shows a superposition of typical powder patterns of one Nb signal and at least two Al signals. 93Nb-NMR line could be reproduced by using the previously reported NQR frequency ?Q ? 1.8MHz and asymmetry parameter ? ? 0 [Kubo T et al 2014 JPS Conf. Proc. 3 012031]. From 27Al-NMR/NQR, NQR parameters are obtained to be ?Q,A ? 1.53 MHz, and ?A ? 0.20 for the site A, and ?Q,B ? 2.28 MHz, and ?B ? 0.17 for the site B. By comparing this result with the previous 27Al-NMR study of PrT2Al20 (T = Ti, V) [Tokunaga Y et al 2013 Phys. Rev. B 88 085124], these two Al site are assigned to the two of three crystallographycally inequivalent Al sites.

Kubo, Tetsuro; Kotegawa, Hisashi; Tou, Hideki; Higashinaka, Ryuji; Nakama, Akihiro; Aoki, Yuji; Sato, Hideyuki

2015-03-01

10

Solid-state NMR/NQR and first-principles study of two niobium halide cluster compounds.  

PubMed

Two hexanuclear niobium halide cluster compounds with a [Nb6X12](2+) (X=Cl, Br) diamagnetic cluster core, have been studied by a combination of experimental solid-state NMR/NQR techniques and PAW/GIPAW calculations. For niobium sites the NMR parameters were determined by using variable Bo field static broadband NMR measurements and additional NQR measurements. It was found that they possess large positive chemical shifts, contrary to majority of niobium compounds studied so far by solid-state NMR, but in accordance with chemical shifts of (95)Mo nuclei in structurally related compounds containing [Mo6Br8](4+) cluster cores. Experimentally determined ?iso((93)Nb) values are in the range from 2,400 to 3,000 ppm. A detailed analysis of geometrical relations between computed electric field gradient (EFG) and chemical shift (CS) tensors with respect to structural features of cluster units was carried out. These tensors on niobium sites are almost axially symmetric with parallel orientation of the largest EFG and the smallest CS principal axes (Vzz and ?33) coinciding with the molecular four-fold axis of the [Nb6X12](2+) unit. Bridging halogen sites are characterized by large asymmetry of EFG and CS tensors, the largest EFG principal axis (Vzz) is perpendicular to the X-Nb bonds, while intermediate EFG principal axis (Vyy) and the largest CS principal axis (?11) are oriented in the radial direction with respect to the center of the cluster unit. For more symmetrical bromide compound the PAW predictions for EFG parameters are in better correspondence with the NMR/NQR measurements than in the less symmetrical chlorine compound. Theoretically predicted NMR parameters of bridging halogen sites were checked by (79/81)Br NQR and (35)Cl solid-state NMR measurements. PMID:24581866

Peri?, Berislav; Gautier, Régis; Pickard, Chris J; Bosio?i?, Marko; Grbi?, Mihael S; Požek, Miroslav

2014-01-01

11

Electron density distribution in cladribine (2-chloro-2?-deoxyadenosine) - A drug against leukemia and multiple sclerosis - Studied by multinuclear NQR spectroscopy and DFT calculations  

NASA Astrophysics Data System (ADS)

2-Chloro-2'-deoxyadenosine (Cladribine) chemotherapeutic drug has been studied experimentally in solid state by 35Cl NQR and NMR-NQR double resonance and theoretically by the Density Functional Theory. Fifteen resonance frequencies on 14N have been detected and assigned to particular nitrogen sites in the 2-CdA molecule. The effects of tautomerism, regioisomerism, conformations and molecular aggregations, related to intermolecular hydrogen bond formation, on the NQR parameters have been analysed within the DFT and AIM ( Atoms in Molecules) formalism. The properties of the whole molecule, the so-called global reactivity descriptors, have been calculated for a comparison of both syn and anti conformations of 2-CdA molecule to check the effect of crystal packing on molecular conformation.

Latosi?ska, J. N.; Latosi?ska, M.; Seliger, J.; Žagar, V.; Kazimierczuk, Z.

2009-07-01

12

35Cl-NQR and DFT study of electronic structure of amlodipine and felodipine vascular-selective drugs from the dihydropyridine Ca ++ antagonists group  

NASA Astrophysics Data System (ADS)

Amlodipine (AM) and felodipine (FL) have been studied in solid state by the nuclear quadrupole resonance (NQR) and density functional theory (DFT). The results have shown that NQR data do not permit a differentiation between R and S enantiomers, which is a consequence of the symmetry of the 4-aryl ring, whereas they permit a differentiation between free bases and salts. The HOMO-LUMO gap is smaller for AM than for FL, which suggests smaller energy of excitation for AM. The absolute hardness, chemical potential and electrophilicity of both AM enantiomers are lower than the corresponding values for FL enantiomers, suggesting that AM should be more reactive than FL in unimolecular reactions.

Latosi?ska, J. N.; Latosi?ska, M.; Kasprzak, J.

2008-09-01

13

Superconducting state of filled-skutterudite RPt4Ge12 (R = La, Pr): 73Ge-NQR studies  

NASA Astrophysics Data System (ADS)

We report 73Ge-NQR studies on filled-skutterudite superconductors LaPt4Ge12 and PrPt4Ge12 under zero external field. In PrPt4Ge12, the measurement of the nuclear spin-lattice relaxation rate 1/T1 has revealed a distinct coherence peak just below Tc followed by an exponential decrease well below Tc, evidencing that PrPt4Ge12 is an s-wave superconductor with the isotropic gap in a weak-coupling regime. In LaPt4Ge12, the 1/T1 exhibits the exponential decrease well below Tc, suggesting the isotropic s-wave superconductivity. Even though 73Ge-NQR-1/T1 in LaPt4Ge12 has been measured under zero field, its coherence peak was absent, which contrasts with the result in Pr-compound. This may point to a possible anisotropy in the Fermi surface and/or some damping effect of quasiparticles in association with electron-phonon interactions.

Kanetake, F.; Mukuda, H.; Kitaoka, Y.; Sugawara, H.; Magishi, K.; Itoh, K. M.; Haller, E. E.

2010-12-01

14

Ru-NQR Study for Novel Phase Transition in CeRu2Al10  

NASA Astrophysics Data System (ADS)

We have performed Ru-NQR measurements on CeRu2Al10 exhibiting novel phase transition at an abnormally high temperature T0 = 27.3 K and on NdRu2Al10 with a magnetic transition temperature Tm = 2.4 K as a reference RKKY system. The splitting of the NQR line due to internal fields below T0 shows a mean-field-like monotonic increase, indicating no change in the magnetic structure below T0. The internal field strength is one order larger than those at Al sites in CeRu2Al10, and is comparable to that at the Ru site in NdRu2Al10 despite the sevenfold smaller magnitude of the 4f moment, being indicative of an enhanced conduction electron polarization at the Ru site. One of the causes of the high T0 might be the enhanced exchange coupling through the Ce–Ru–Ce path mediated by the enhanced conduction electron polarization. Being similar to that in the Al site, the nuclear spin–lattice relaxation rate 1/T1 shows a gap-like decrease below T0 without enhancement owing to a critical slowing down at T0, in contrast to the mean field 2nd-order transition.

Matsumura, Masahiro; Tomita, Naoya; Matsuoka, Junichirou; Kishimoto, Yasuki; Kato, Harukazu; Kitagawa, Kentaro; Nishioka, Takashi; Tanida, Hiroshi; Sera, Masafumi

2014-10-01

15

Weakly first-order behavior in ferromagnetic transition of UCoGe revealed by 59Co-NQR studies  

NASA Astrophysics Data System (ADS)

We have performed 59Co nuclear quadrupole resonance (NQR) measurements on ferromagnetic (FM) superconductor UCoGe, in which ferromagnetism occurs at TCurie ˜ 2.5 K. By measuring NQR spectrum at various temperatures, we investigated the development of local magnetic moment around TCurie, and suggest that FM transition possesses weakly first-order character. This first-order behavior is consistent with the theoretical prediction that the low temperature FM transition in itinerant magnets is generically of first-order.

Hattori, T.; Ishida, K.; Nakai, Y.; Ohta, T.; Deguchi, K.; Sato, N. K.; Satoh, I.

2010-12-01

16

Studies of the electronic structure and biological activity of chosen 1,4-benzodiazepines by 35Cl NQR spectroscopy and DFT calculations  

NASA Astrophysics Data System (ADS)

Selected derivatives of 1,4-benzodiazepine: lorazepam, lormetazepam, oxazepam and temazepam, used as active substances in anxiolytic drugs, have been studied by 35Cl NQR method in order to find the correlation between electronic structure and biological activity. The 35Cl NQR resonance frequencies ( ?Q) measured at 77 K have been correlated with the following parameters characterising their biological activity: biological half-life period ( t0.5), affinity to benzodiazepine receptor (IC 50) and mean dose equivalent. The results of experimental study of some benzodiazepine derivatives by nuclear quadrupole resonance of 35Cl nuclei are compared with theoretical results based on DFT calculations which were carried out by means of Gaussian'98 W software.

Bronisz, K.; Ostafin, M.; Poleshchuk, O. Kh.; Mielcarek, J.; Nogaj, B.

2006-11-01

17

Zero-field NMR and NQR studies of magnetically ordered state in charge-ordered EuPtP  

NASA Astrophysics Data System (ADS)

EuPtP undergoes two valence transitions and has two kinds of valence states of Eu ions at low temperatures. In the charge-ordered state, this compound shows an antiferromagnetic order ascribed to magnetic divalent Eu ions. We investigated the antiferromagnetically ordered state of EuPtP by nuclear magnetic resonance (NMR) measurement and nuclear quadrupole resonance (NQR) measurement in a zero external magnetic field. The observed 153Eu NMR signals of a magnetic divalent state and Eu,153151 NQR signals of a nonmagnetic trivalent state clearly demonstrate that the spins order in the hexagonal basal plane and the internal magnetic field is not canceled out, even at the Eu3 + layers which are in the middle of magnetic Eu2 + layers. In addition, the observation of 31P and 195Pt NMR spectra allowed us to discuss a possible magnetic structure. We also evaluated the nuclear quadrupole frequencies for both Eu2 + and Eu3 + ion states.

Koyama, T.; Maruyama, T.; Ueda, K.; Mito, T.; Mitsuda, A.; Umeda, M.; Sugishima, M.; Wada, H.

2015-03-01

18

A study of hydrogen bond of imidazole and its 4-nitro derivative by ab initio and DFT calculated NQR parameters  

Microsoft Academic Search

Nuclear quadrupole resonance (NQR) parameters of 14N, 2H of N2H groups are calculated for imidazole and 4-nitroimidazole using HF and B3LYP methods. These computations are performed on the basis of X-ray and neutron diffraction structural data which are collected at 100, 103, 123 and 293 K temperatures. In order to take into account intermolecular hydrogen bonds and the van der

S. K. Amini; N. L. Hadipour; F. Elmi

2004-01-01

19

First-principles study of 75As NQR in arsenic-chalcogenide compounds  

Microsoft Academic Search

We present a theoretical study of the nuclear quadrupole interaction, nuQ, of 75As in crystalline and amorphous materials containing sulfur and selenium, and compare them with experiment. We studied a combination of hydrogen-terminated molecular clusters and periodic cells at various levels of quantum chemical theory. The results show clearly that the standard density functional theory (DFT) approximations, LDA and GGA,

Arthur H. Edwards; P. C. Taylor; Kristy A. Campbell; Andrew C. Pineda

2011-01-01

20

Application of nuclear quadrupole resonance to the study of clathrates. sup 35 Cl NQR and crystallography of clathrated CCl sub 4  

SciTech Connect

The {sup 35}Cl nuclear quadrupole resonance (NQR) spectra of CCl{sub 4} in more than 20 clathrates have been measured in the range 4-200 K. The crystal structures of CCl{sub 4}/Dianin's compound (1), CCl{sub 4}/Fe(AcAc){sub 3} (3), CCl{sub 4}/Ni(SCN){sub 2}(3-MePy){sub 4} (4), and CCl{sub 4}/Ni(exan){sub 2}(4,4{prime}-dm-2,2{prime}-bpy) (19) clathrates are also reported. Site symmetry and site multiplicity of the guest molecule in clathrates were determined by NQR spectroscopy and by x-ray crystallography. The degree of host-guest interaction was estimated from the NQR frequency shifts. The libration frequencies of the guest molecules in trigonal cavities were determined from NQR frequencies by Bayer-Kushida theory analysis.

Pang, Li; Lucken, E.A.C.; Bernardinelli, G. (Univ. de Geneve (Switzerland))

1990-11-21

21

Downregulation of Na(+)-NQR complex is essential for Vibrio alginolyticus in resistance to balofloxacin.  

PubMed

Increasingly isolated frequency of antibiotic-resistant V. alginolyticus strains in clinic and aquaculture has been reported, but the mechanisms of V. alginolyticus antibiotic resistance are largely absent. In the present study, native/SDS-PAGE based proteomics, which may provide information on protein-protein interaction, was utilized to investigate differential proteins of V. alginolyticus in resistance to balofloxacin. Ten proteins were altered, in which V12G01_04671, V12G01_00457, V12G01_15927, V12G01_15240, NqrA (spot 26), and NqrF (spot 30) were downregulated, while V12G01_22043, TolC, V12G01_15130, V12G01_19297 were upregulated. Importantly, the two components of Na(+)-NQR complex, NqrA and NqrF, were vertically lined and was further investigated. Western blotting assay indicated that downregulation of the two proteins contrasted sharply with upregulation of a control protein TolC, which was consistent with the result obtained from 2-DE gel analysis. Furthermore, overexpression of NqrA, NqrF and TolC resulted in decrease and elevation of bacterial survival ability in medium with balofloxacin, respectively. These results indicate that downregulation of Na(+)-NQR complex is essential for V. alginolyticus resistance to balofloxacin. This is the first report on the role of Na(+)-NQR complex in antibiotic resistance. This finding highlights the way to an understanding of antibiotic-resistant mechanisms in content of metabolic regulation. PMID:22465713

Li, Peipei; Liu, Xianjie; Li, Hui; Peng, Xuan-Xian

2012-05-17

22

Application of nuclear quadrupole resonance to the study of clathrates. sup 35 Cl NQR and crystallography of clathrated CCl sub 4  

Microsoft Academic Search

The ³⁵Cl nuclear quadrupole resonance (NQR) spectra of CClâ in more than 20 clathrates have been measured in the range 4-200 K. The crystal structures of CClâ\\/Dianin's compound (1), CClâ\\/Fe(AcAc)â (3), CClâ\\/Ni(SCN)â(3-MePy)â (4), and CClâ\\/Ni(exan)â(4,4â²-dm-2,2â²-bpy) (19) clathrates are also reported. Site symmetry and site multiplicity of the guest molecule in clathrates were determined by NQR spectroscopy and by x-ray crystallography.

Li Pang; E. A. C. Lucken; G. Bernardinelli

1990-01-01

23

Explosives detection by nuclear quadrupole resonance (NQR)  

NASA Astrophysics Data System (ADS)

Pure nuclear quadrupole resonance (NQR) of 14N nuclei is quite promising as a method for detecting explosives such as RDX and contraband narcotics such as cocaine and heroin in quantities of interest. Pure NQR is conducted without an external applied magnetic field, so potential concerns about damage to magnetically encoded data or exposure of personnel to large magnetic fields are not relevant. Because NQR frequencies of different compounds are quite distinct, we do not encounter false alarms from the NQR signals of other benign materials. We have constructed a laboratory prototype NQR explosives detector which interrogates a volume of 300 liters (10 ft3). This paper presents abbreviated results from a demonstration of the laboratory prototype NQR explosives detector conducted at the Federal Aviation Administration Technical Center in May 1994 on RDX-based explosives.

Garroway, Allen N.; Buess, Michael L.; Yesinowski, James P.; Miller, Joel B.; Krauss, Ronald A.

1994-10-01

24

Motion of Water Molecules and Hydrogen Bonds in Zinc Hexachlorostannate (IV) Hexahydrate as Studied by 1H NMR and 35Cl NQR  

NASA Astrophysics Data System (ADS)

The 1H NMR spin-lattice relaxation time T1, 35Cl NQR frequency ?Q, and 35Cl NQR spin-lattice relaxation time T1Q of [Zn(H2O)6] [SnCl6] (zinc hexachlorostannate(IV) hexahydrate) have been measured at temperatures between 77 and 350 K. The NQR spin echo signal with ?Q = 15.689 MHz at 77 K showed a positive temperature coefficient attributable to O-H-Cl type H-bonds in the crystal. ?Q at 77 K is strongly correlated with the electronegativity ?M of the metal M in the series of stannates [M(H2O)6] [SnCl6] (M = Mg, Ca, Mn, Co, Ni, Zn). A T1 minimum observed for the Zn salt is ascribed to 180° flips of water molecules with an activation energy of 20 kJ mol-1. The motion is influenced by repulsive forces among the water molecules within a cation rather than by attractive forces between the H-bonded H and CI atoms. T1Q proved to be mainly governed by lattice vibrations, weakly modulated by the fluctuating electric field gradient caused by the 180° flip motions.

Ishikawa, A.; Sasane, A.; Hirakawa, Y.; Mori, Y.

1996-06-01

25

Multinuclear NMR/NQR study of HgBa 2CuO 4+ xF y superconductors with different oxygen and fluorine content  

NASA Astrophysics Data System (ADS)

We have measured 63,65Cu NMR/NQR spectra, 199Hg and 19F NMR spectra and spin-lattice relaxation rate on a series of powder HgBa 2CuO 4+ xF y samples with different oxygen and fluorine content. Comparison of 63Cu and 199Hg relaxation data to numerical calculations for several types of the order parameter symmetry gives the best coincidence with the d-wave symmetry. 19F NMR line width and relaxation rate are strongly influenced by the magnetic flux-line motion. The 19F magnetization recovery curve is described by a stretched exponential function. The 19F spin-lattice relaxation strongly depends on the fluorine content evidencing that at higher doping level part of F atoms occupy the apical O2 position.

Gippius, A. A.; Antipov, E. V.; Klein, O.; Lüders, K.

2000-07-01

26

A miniaturized NQR spectrometer for a multi-channel NQR-based detection device.  

PubMed

A low frequency (0.5-5 MHz) battery operated sensitive pulsed NQR spectrometer with a transmitter power up to 5 W and a total mass of about 3 kg aimed at detecting (14)N NQR signals, predominantly of illicit materials, was designed and assembled. This spectrometer uses a standard software defined radio (SDR) platform for the data acquisition unit. Signal processing is done with the LabView Virtual instrument on a personal computer. We successfully tested the spectrometer by measuring (14)N NQR signals from aminotetrazole monohydrate (ATMH), potassium nitrate (PN), paracetamol (PCM) and trinitrotoluene (TNT). Such a spectrometer is a feasible component of a portable single or multichannel (14)N NQR based detection device. PMID:25233110

Beguš, Samo; Jazbinšek, Vojko; Pirnat, Janez; Trontelj, Zvonko

2014-10-01

27

A miniaturized NQR spectrometer for a multi-channel NQR-based detection device  

NASA Astrophysics Data System (ADS)

A low frequency (0.5-5 MHz) battery operated sensitive pulsed NQR spectrometer with a transmitter power up to 5 W and a total mass of about 3 kg aimed at detecting 14N NQR signals, predominantly of illicit materials, was designed and assembled. This spectrometer uses a standard software defined radio (SDR) platform for the data acquisition unit. Signal processing is done with the LabView Virtual instrument on a personal computer. We successfully tested the spectrometer by measuring 14N NQR signals from aminotetrazole monohydrate (ATMH), potassium nitrate (PN), paracetamol (PCM) and trinitrotoluene (TNT). Such a spectrometer is a feasible component of a portable single or multichannel 14N NQR based detection device.

Beguš, Samo; Jazbinšek, Vojko; Pirnat, Janez; Trontelj, Zvonko

2014-10-01

28

14 N NQR spectrum of sildenafil citrate  

NASA Astrophysics Data System (ADS)

The 14N nuclear quadrupole resonance (NQR) spectrum of sildenafil citrate tablets has been recorded allowing the quadrupole coupling constants and asymmetry parameters of all six unique nitrogen atoms in its structure to be determined. A density function calculation gives results that are largely in agreement with the experimental values.

Stephenson, David; Singh, Nadia

2014-10-01

29

Roles of the Sodium-Translocating NADH:Quinone Oxidoreductase (Na+-NQR) on Vibrio cholerae Metabolism, Motility and Osmotic Stress Resistance  

PubMed Central

The Na+ translocating NADH:quinone oxidoreductase (Na+-NQR) is a unique respiratory enzyme catalyzing the electron transfer from NADH to quinone coupled with the translocation of sodium ions across the membrane. Typically, Vibrio spp., including Vibrio cholerae, have this enzyme but lack the proton-pumping NADH:ubiquinone oxidoreductase (Complex I). Thus, Na+-NQR should significantly contribute to multiple aspects of V. cholerae physiology; however, no detailed characterization of this aspect has been reported so far. In this study, we broadly investigated the effects of loss of Na+-NQR on V. cholerae physiology by using Phenotype Microarray (Biolog), transcriptome and metabolomics analyses. We found that the V. cholerae ?nqrA-F mutant showed multiple defects in metabolism detected by Phenotype Microarray. Transcriptome analysis revealed that the V. cholerae ?nqrA-F mutant up-regulates 31 genes and down-regulates 55 genes in both early and mid-growth phases. The most up-regulated genes included the cadA and cadB genes, encoding a lysine decarboxylase and a lysine/cadaverine antiporter, respectively. Increased CadAB activity was further suggested by the metabolomics analysis. The down-regulated genes include sialic acid catabolism genes. Metabolomic analysis also suggested increased reductive pathway of TCA cycle and decreased purine metabolism in the V. cholerae ?nqrA-F mutant. Lack of Na+-NQR did not affect any of the Na+ pumping-related phenotypes of V. cholerae suggesting that other secondary Na+ pump(s) can compensate for Na+ pumping activity of Na+-NQR. Overall, our study provides important insights into the contribution of Na+-NQR to V. cholerae physiology. PMID:24811312

Minato, Yusuke; Halang, Petra; Quinn, Matthew J.; Faulkner, Wyatt J.; Aagesen, Alisha M.; Steuber, Julia; Stevens, Jan F.; Häse, Claudia C.

2014-01-01

30

Roles of the sodium-translocating NADH:quinone oxidoreductase (Na+-NQR) on vibrio cholerae metabolism, motility and osmotic stress resistance.  

PubMed

The Na+ translocating NADH:quinone oxidoreductase (Na+-NQR) is a unique respiratory enzyme catalyzing the electron transfer from NADH to quinone coupled with the translocation of sodium ions across the membrane. Typically, Vibrio spp., including Vibrio cholerae, have this enzyme but lack the proton-pumping NADH:ubiquinone oxidoreductase (Complex I). Thus, Na+-NQR should significantly contribute to multiple aspects of V. cholerae physiology; however, no detailed characterization of this aspect has been reported so far. In this study, we broadly investigated the effects of loss of Na+-NQR on V. cholerae physiology by using Phenotype Microarray (Biolog), transcriptome and metabolomics analyses. We found that the V. cholerae ?nqrA-F mutant showed multiple defects in metabolism detected by Phenotype Microarray. Transcriptome analysis revealed that the V. cholerae ?nqrA-F mutant up-regulates 31 genes and down-regulates 55 genes in both early and mid-growth phases. The most up-regulated genes included the cadA and cadB genes, encoding a lysine decarboxylase and a lysine/cadaverine antiporter, respectively. Increased CadAB activity was further suggested by the metabolomics analysis. The down-regulated genes include sialic acid catabolism genes. Metabolomic analysis also suggested increased reductive pathway of TCA cycle and decreased purine metabolism in the V. cholerae ?nqrA-F mutant. Lack of Na+-NQR did not affect any of the Na+ pumping-related phenotypes of V. cholerae suggesting that other secondary Na+ pump(s) can compensate for Na+ pumping activity of Na+-NQR. Overall, our study provides important insights into the contribution of Na+-NQR to V. cholerae physiology. PMID:24811312

Minato, Yusuke; Fassio, Sara R; Kirkwood, Jay S; Halang, Petra; Quinn, Matthew J; Faulkner, Wyatt J; Aagesen, Alisha M; Steuber, Julia; Stevens, Jan F; Häse, Claudia C

2014-01-01

31

35Cl NQR Spectra of several 2,2-bis- p-chlorophenyl chloroethane derivatives  

NASA Astrophysics Data System (ADS)

Measurement of NQR line frequency at 77 K have been performed for the following compounds: 1-chloro-2,2-bis-(p-chlorophenyl) ethylene (DDMU), 1,1-dichloro-2,2-bis-(p-chlorophenyl) ethylene (DDE), 1,1-dichloro-2,2-bis-(p-chlorophenyl) ethane (ODD), 1,1,1-trichloro-2,2-bis (p-chlorophenyl) ethane (DDT). An attempt to assign spectrum lines to particular Cl nuclei in a molecule has been made. Molecular and crystallographic inequivalences occurring in these compounds have been considered. Comparison of the NQR and crystallographic data revealed the influence of phenyl rings conformation on electric charge distribution in the studied molecules.

Nogaj, B.; Pietrzak, J.; Wielopolska, E.; Schroeder, G.; Jarczewski, A.

32

Structural and Functional Investigation of Flavin Binding Center of the NqrC Subunit of Sodium-Translocating NADH:Quinone Oxidoreductase from Vibrio harveyi.  

PubMed

Na+-translocating NADH:quinone oxidoreductase (NQR) is a redox-driven sodium pump operating in the respiratory chain of various bacteria, including pathogenic species. The enzyme has a unique set of redox active prosthetic groups, which includes two covalently bound flavin mononucleotide (FMN) residues attached to threonine residues in subunits NqrB and NqrC. The reason of FMN covalent bonding in the subunits has not been established yet. In the current work, binding of free FMN to the apo-form of NqrC from Vibrio harveyi was studied showing very low affinity of NqrC to FMN in the absence of its covalent bonding. To study structural aspects of flavin binding in NqrC, its holo-form was crystallized and its 3D structure was solved at 1.56 Å resolution. It was found that the isoalloxazine moiety of the FMN residue is buried in a hydrophobic cavity and that its pyrimidine ring is squeezed between hydrophobic amino acid residues while its benzene ring is extended from the protein surroundings. This structure of the flavin-binding pocket appears to provide flexibility of the benzene ring, which can help the FMN residue to take the bended conformation and thus to stabilize the one-electron reduced form of the prosthetic group. These properties may also lead to relatively weak noncovalent binding of the flavin. This fact along with periplasmic location of the FMN-binding domains in the vast majority of NqrC-like proteins may explain the necessity of the covalent bonding of this prosthetic group to prevent its loss to the external medium. PMID:25734798

Borshchevskiy, Valentin; Round, Ekaterina; Bertsova, Yulia; Polovinkin, Vitaly; Gushchin, Ivan; Ishchenko, Andrii; Kovalev, Kirill; Mishin, Alexey; Kachalova, Galina; Popov, Alexander; Bogachev, Alexander; Gordeliy, Valentin

2015-01-01

33

Structural and Functional Investigation of Flavin Binding Center of the NqrC Subunit of Sodium-Translocating NADH:Quinone Oxidoreductase from Vibrio harveyi  

PubMed Central

Na+-translocating NADH:quinone oxidoreductase (NQR) is a redox-driven sodium pump operating in the respiratory chain of various bacteria, including pathogenic species. The enzyme has a unique set of redox active prosthetic groups, which includes two covalently bound flavin mononucleotide (FMN) residues attached to threonine residues in subunits NqrB and NqrC. The reason of FMN covalent bonding in the subunits has not been established yet. In the current work, binding of free FMN to the apo-form of NqrC from Vibrio harveyi was studied showing very low affinity of NqrC to FMN in the absence of its covalent bonding. To study structural aspects of flavin binding in NqrC, its holo-form was crystallized and its 3D structure was solved at 1.56 Å resolution. It was found that the isoalloxazine moiety of the FMN residue is buried in a hydrophobic cavity and that its pyrimidine ring is squeezed between hydrophobic amino acid residues while its benzene ring is extended from the protein surroundings. This structure of the flavin-binding pocket appears to provide flexibility of the benzene ring, which can help the FMN residue to take the bended conformation and thus to stabilize the one-electron reduced form of the prosthetic group. These properties may also lead to relatively weak noncovalent binding of the flavin. This fact along with periplasmic location of the FMN-binding domains in the vast majority of NqrC-like proteins may explain the necessity of the covalent bonding of this prosthetic group to prevent its loss to the external medium. PMID:25734798

Bertsova, Yulia; Polovinkin, Vitaly; Gushchin, Ivan; Ishchenko, Andrii; Kovalev, Kirill; Mishin, Alexey; Kachalova, Galina; Popov, Alexander; Bogachev, Alexander; Gordeliy, Valentin

2015-01-01

34

Exploiting temperature dependency in the detection of NQR signals  

Microsoft Academic Search

Nuclear quadrupole resonance (NQR) offers an unequivocal method of detecting and identifying land mines. Unfortunately, the practical use of NQR is restricted by the low signal-to-noise ratio (SNR), and the means to improve the SNR are vital to enable a rapid, reliable, and convenient system. In this paper, an approximate maximum-likelihood detector (AML) is developed, exploiting the temperature dependency of

Andreas Jakobsson; Magnus Mossberg; Michael D. Rowe; John A. S. Smith

2006-01-01

35

Frequency selective detection of nuclear quadrupole resonance (NQR) spin echoes  

NASA Astrophysics Data System (ADS)

Nuclear Quadrupole Resonance (NQR) is a radio frequency (RF) technique that can be used to detect the presence of quadrupolar nuclei, such as the 14N nucleus prevalent in many explosives and narcotics. The technique has been hampered by low signal-to-noise ratios and is further aggravated by the presence of RF interference (RFI). To ensure accurate detection, proposed detectors should exploit the rich form of the NQR signal. Furthermore, the detectors should also be robust to any remaining residual interference, left after suitable RFI mitigation has been employed. In this paper, we propose a new NQR data model, particularly for the realistic case where multiple pulse sequences are used to generate trains of spin echoes. Furthermore, we refine two recently proposed approximative maximum likelihood (AML) detectors, enabling the algorithm to optimally exploit the data model of the entire echo train and also incorporate knowledge of the temperature dependent spin-echo decay time. The AML-based detectors ensure accurate detection and robustness against residual RFI, even when the temperature of the sample is not precisely known, by exploiting the dependencies of the NQR resonant lines on temperature. Further robustness against residual interference is gained as the proposed detector is frequency selective; exploiting only those regions of the spectrum where the NQR signal is expected. Extensive numerical evaluations based on both simulated and measured NQR data indicate that the proposed Frequency selective Echo Train AML (FETAML) detector offers a significant improvement as compared to other existing detectors.

Somasundaram, Samuel D.; Jakobsson, Andreas; Smith, John A. S.; Althoefer, Kaspar A.

2006-05-01

36

A mutation in Na(+)-NQR uncouples electron flow from Na(+) translocation in the presence of K(+).  

PubMed

The sodium-pumping NADH:ubiquinone oxidoreductase (Na(+)-NQR) is a bacterial respiratory enzyme that obtains energy from the redox reaction between NADH and ubiquinone and uses this energy to create an electrochemical Na(+) gradient across the cell membrane. A number of acidic residues in transmembrane helices have been shown to be important for Na(+) translocation. One of these, Asp-397 in the NqrB subunit, is a key residue for Na(+) uptake and binding. In this study, we show that when this residue is replaced with asparagine, the enzyme acquires a new sensitivity to K(+); in the mutant, K(+) both activates the redox reaction and uncouples it from the ion translocation reaction. In the wild-type enzyme, Na(+) (or Li(+)) accelerates turnover while K(+) alone does not activate. In the NqrB-D397N mutant, K(+) accelerates the same internal electron transfer step (2Fe-2S ? FMNC) that is accelerated by Na(+). This is the same step that is inhibited in mutants in which Na(+) uptake is blocked. NqrB-D397N is able to translocate Na(+) and Li(+), but when K(+) is introduced, no ion translocation is observed, regardless of whether Na(+) or Li(+) is present. Thus, this mutant, when it turns over in the presence of K(+), is the first, and currently the only, example of an uncoupled Na(+)-NQR. The fact the redox reaction and ion pumping become decoupled from each other only in the presence of K(+) provides a switch that promises to be a useful experimental tool. PMID:25486106

Shea, Michael E; Mezic, Katherine G; Juárez, Oscar; Barquera, Blanca

2015-01-20

37

Two-dimensional NQR using ultra-broadband electronics.  

PubMed

We have recently developed an ultra-broadband instrument that can effectively excite and detect NMR and NQR signals over a wide frequency range. Our current system operates between 100 kHz and 3.2 MHz using an un-tuned sample coil. The major benefits of this instrument compared to conventional NQR/NMR systems include increased robustness, ease of use (in particular for multi-frequency experiments), and elimination of the need for tuning adjustments in the hardware. Here we describe its use for performing two-dimensional (2D) scans, which allow improved interpretation of complex NQR spectra by detecting the connected resonances. Our method relies on population transfers between the three energy levels of spin-1 nuclei (such as (14)N) by using multi-frequency excitation and a single RF coil. Experimental results on pure samples and mixtures are also presented. PMID:24495675

Mandal, S; Song, Y-Q

2014-03-01

38

Potential Antiferromagnetic Fluctuations in Hole-Doped Iron-Pnictide Superconductor Ba1-xKxFe2As2 Studied by 75As Nuclear Magnetic Resonance Measurement0.1143/JPSJ.81.054704  

SciTech Connect

We have performed 75As nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements on single-crystalline Ba1-xKxFe2As2 for x = 0.27–1. 75As nuclear quadruple resonance frequency (?Q) increases linearly with increasing x. The Knight shift K in the normal state shows Pauli paramagnetic behavior with a weak temperature T dependence. K increases gradually with increasing x. By contrast, the nuclear spin–lattice relaxation rate 1/T1 in the normal state has a strong T dependence, which indicates the existence of large antiferomagnetic (AF) spin fluctuations for all x's. The T dependence of 1/T1 shows a gaplike behavior below approximately 100 K for 0.6 < x < 0.9. This behaviors is well explained by the change in the band structure with the expansion of hole Fermi surfaces and the shrinkage and disappearance of electron Fermi surfaces at the Brillouin zone (BZ) with increasing x. The anisotropy of 1/T1, represented by the ratio of 1/T1ab to 1/T1c, is always larger than 1 for all x's, which indicates that stripe-type AF fluctuations are dominant in this system. The K in the superconducting (SC) state decreases, which corresponds to the appearance of spin-singlet superconductivity. The T dependence of 1/T1 in the SC state indicates a multiple-SC-gap feature. A simple two-gap model analysis shows that the larger superconducting gap gradually decreases with increasing x from 0.27 to 1 and a smaller gap decreases rapidly and nearly vanishes for x > 0.6 where electron pockets in BZ disappear.

Hirano, Masanori; Yamada, Yuji; Saito, Taku; Nagashima, Ryo; Konishi, Takehisa; Toriyama, Tatsuya; Ohta, Yukinori; Fukazawa, Hideto; Kohori, Yoh; Furukawa, Yuji; Kihou, Kunihiro; Lee, Chul-Ho; Eisaki, Hiroshi

2012-04-12

39

Rapid detection of arsenic minerals using portable broadband NQR  

NASA Astrophysics Data System (ADS)

The remote real-time detection of specific arsenic species would significantly benefit in minerals processing to mitigate the release of arsenic into aquatic environments and aid in selective mining. At present, there are no technologies available to detect arsenic minerals in bulk volumes outside of laboratories. Here we report on the first room-temperature broadband 75As nuclear quadrupole resonance (NQR) detection of common and abundant arsenic ores in the Earth crust using a large sample (0.78 L) volume prototype sensor. Broadband excitation aids in detection of natural minerals with low crystallinity. We briefly discuss how the proposed NQR detector could be employed in mining operations.

Lehmann-Horn, J. A.; Miljak, D. G.; O'Dell, L. A.; Yong, R.; Bastow, T. J.

2014-10-01

40

H/D isotope effect of 1H MAS NMR spectra and 79Br NQR frequencies of piperidinium p-bromobenzoate and pyrrolidinium p-bromobenzoate  

NASA Astrophysics Data System (ADS)

H/D isotope effects onto 79Br NQR frequencies of piperidinium p-bromobenzoate were studied by deuterium substitution of hydrogen atoms which form two kinds of N-H?O type hydrogen bonds, and the isotope shift of ca. 100 kHz were detected for a whole observed temperature range. In addition, 1H MAS NMR spectra measurements of piperidinium and pyrrolidinium p-bromobenzoate were carried out and little isotope changes of NMR line shape were detected. In order to reveal effects of molecular arrangements into the obtained isotope shift of NQR frequencies, single-crystal X-ray measurement of piperidinium p-bromobenzoate- d2 and density-functional-theory calculation were carried out. Our estimation showed the dihedral-angle change between piperidine and benzene ring contributes to isotope shift rather than those of N-H lengths by deuterium substitution.

Honda, Hisashi; Kyo, Shinshin; Akaho, Yousuke; Takamizawa, Satoshi; Terao, Hiromitsu

2010-04-01

41

NMR and NQR parameters of ethanol crystal  

E-print Network

Electric field gradients and chemical shielding tensors of the stable monoclinic crystal phase of ethanol are computed. The projector-augmented wave (PAW) and gauge-including projector-augmented wave (GIPAW) models in the periodic plane-wave density functional theory are used. The crystal data from X-ray measurements, as well as the structures where either all atomic, or only hydrogen atom positions are optimized in the density functional theory are analyzed. These structural models are also studied by including the semi-empirical Van der Waals correction to the density functional theory. Infrared spectra of these five crystal models are calculated.

Milinkovic, M

2012-01-01

42

Localization and Function of the Membrane-bound Riboflavin in the Na+-translocating NADH:Quinone Oxidoreductase (Na+-NQR) from Vibrio cholerae*  

PubMed Central

The sodium ion-translocating NADH:quinone oxidoreductase (Na+-NQR) from the human pathogen Vibrio cholerae is a respiratory membrane protein complex that couples the oxidation of NADH to the transport of Na+ across the bacterial membrane. The Na+-NQR comprises the six subunits NqrABCDEF, but the stoichiometry and arrangement of these subunits are unknown. Redox-active cofactors are FAD and a 2Fe-2S cluster on NqrF, covalently attached FMNs on NqrB and NqrC, and riboflavin and ubiquinone-8 with unknown localization in the complex. By analyzing the cofactor content and NADH oxidation activity of subcomplexes of the Na+-NQR lacking individual subunits, the riboflavin cofactor was unequivocally assigned to the membrane-bound NqrB subunit. Quantitative analysis of the N-terminal amino acids of the holo-complex revealed that NqrB is present in a single copy in the holo-complex. It is concluded that the hydrophobic NqrB harbors one riboflavin in addition to its covalently attached FMN. The catalytic role of two flavins in subunit NqrB during the reduction of ubiquinone to ubiquinol by the Na+-NQR is discussed. PMID:20558724

Casutt, Marco S.; Huber, Tamara; Brunisholz, René; Tao, Minli; Fritz, Günter; Steuber, Julia

2010-01-01

43

Application of nuclear quadrupole resonance in study of minerals  

Microsoft Academic Search

The NQR method has been used to study some structural and chemical properties of minerals that are difficult or impossible to determine by conventional methods. For example, an X-ray determination commonly integrates the data for all cells, whereas NQR can separate the nearly ideal from highly distorted ones. It can thus give a better picture of the ideal structure and

I. N. Penkov; I. A. Sofin

1967-01-01

44

Evidence for low-temperature internal dynamics in Cu 12As 4S 13 according to copper NQR and nuclear relaxation  

NASA Astrophysics Data System (ADS)

63,65Cu nuclear quadrupole resonance (NQR) was applied to study the natural mineral Cu 12As 4S 13 (tennantite) in the temperature range 4.2-210 K. The obtained results point to the presence of field fluctuations caused by internal motions in tennantite. Consistently with the crystal structure, the experimental data can be described by an occurrence of a magnetic phase transition, which takes place near 65 K. The low-temperature phase is characterized by Cu(II) electron magnetic moments freezing in the form of a spin-glass-like constitution.

Gainov, R. R.; Dooglav, A. V.; Pen'kov, I. N.

2006-12-01

45

Genomic Plasticity of the rrn-nqrF Intergenic Segment in the Chlamydiaceae?  

PubMed Central

In Chlamydiaceae, the nucleotide sequence between the 5S rRNA gene and the gene for subunit F of the Na+-translocating NADH-quinone reductase (nqrF or dmpP) has varied lengths and gene contents. We analyzed this site in 45 Chlamydiaceae strains having diverse geographical and pathological origins and including members of all nine species. PMID:17158668

Liu, Zhi; Rank, Roger; Kaltenboeck, Bernhard; Magnino, Simone; Dean, Deborah; Burall, Laurel; Plaut, Roger D.; Read, Timothy D.; Myers, Garry; Bavoil, Patrik M.

2007-01-01

46

35Cl NQR spectra of certain chlorine-containing chromium compounds  

NASA Astrophysics Data System (ADS)

The coordination of chlorobenzene to Cr(CO)3 and ClC6H5Cr+ fragments is shown to result in a considerable rise in the NQR frequency of chlorine atoms. The field constant in (chlorobenzene)chromium tricarbonyl was found to grow markedly, relative to pure chlorobenzene.

Kuznetsov, S. I.; Bryukhova, E. V.; Semin, G. K.

2015-03-01

47

Z .Solid State Nuclear Magnetic Resonance 11 1998 139156 SQUID detected NMR and NQR  

E-print Network

Z .Solid State Nuclear Magnetic Resonance 11 1998 139­156 SQUID detected NMR and NQR Matthew P dc Superconducting QUantum Interference Device SQUID is a sensitive detector of magnetic flux to a thin film superconducting coil deposited on the SQUID to form a flux transformer. With this untuned

Augustine, Mathew P.

48

Isomorphism and disorder in o-chlorohalobenzenes studied by NQR.  

PubMed

In this work we present experimental results that allow to characterize different solid modifications found in o-chlorohalobenzenes. Three disordered phases have been found in o-chlorobromobenzene. The stable phase at high temperature (phase I) is also obtained by quenching the sample at 77 K. Slow cooling allow to obtain the low temperature phase III which, on heating, transforms to phase II at 183 K and this, in turns, transforms to phase I at T~210 K. The disorder evidenced through the Nuclear Quadrupole Resonance spectra, is attributed to a random occupation of chlorine and bromine sites. In all phases there is evidence of molecular reorientations out of the benzene ring plane around the pseudo-symmetry axis between the atoms of Cl and Br. In o-chlorofluorobenzene two phases have been found depending on the cooling rate. One phase is disordered due to the random exchange of the occupation of Cl and F sites. In this case, there is also evidence of molecular reorientations out of the benzene ring plane, but in this case the reorientation is around the pseudo-symmetry axis that pass through the C-Cl bonds. Comparisons with the behavior of o-dichlorobenzene are also made. PMID:24440588

Pérez, Silvina C; Wolfenson, Alberto; Zuriaga, Mariano

2014-01-01

49

Coexistence of multiple charge-density waves and superconductivity in SrPt2As2 revealed by 75As-NMR /NQR and 195Pt-NMR  

NASA Astrophysics Data System (ADS)

The relationship between charge-density wave (CDW) orders and superconductivity in arsenide superconductor SrPt2As2 with Tc=5.2 K which crystallizes in the CaBe2Ge2 -type structure was studied by 75As nuclear magnetic resonance (NMR) measurements up to 520 K, and 75As nuclear quadrupole resonance (NQR) and 195Pt-NMR measurements down to 1.5 K. At high temperature, 75As-NMR spectrum and nuclear-spin-relaxation rate (1 /T1) have revealed two distinct CDW orders, one realized in the As-Pt-As layer below TCDWAs (1 )=410 K and the other in the Pt-As-Pt layer below TCDWAs (2 )=255 K . The 1 /T1 measured by 75As-NQR shows a clear Hebel-Slichter peak just below Tc and decreases exponentially well below Tc. Concomitantly, 195Pt Knight shift decreases below Tc. Our results indicate that superconductivity in SrPt2As2 is in the spin-singlet state with an s -wave gap and is robust under the two distinct CDW orders in different layers.

Kawasaki, Shinji; Tani, Yoshihiko; Mabuchi, Tomosuke; Kudo, Kazutaka; Nishikubo, Yoshihiro; Mitsuoka, Daisuke; Nohara, Minoru; Zheng, Guo-qing

2015-02-01

50

NQR Line Broadening Due to Crystal Lattice Imperfections and Its Relationship to Shock Sensitivity  

NASA Astrophysics Data System (ADS)

The hydrodynamic hot spot model is used to explain the difference between shock sensitive and shock insensitive explosives. Among the major factors that influence the shock sensitivity of energetic compounds are the quality and particle size of the energetic crystals used to formulate the cast plastic bonded explosive. As do all energetic compounds, RDX and HMX exhibit internal crystal defects the magnitude and type of which depend on the manufacturing process used to synthesize and re-crystallize the energetic compound. Nuclear Quadrupole Resonance (NQR) spectroscopy was used to determine the crystal quality of RDX, HMX and CL-20 obtained from various manufacturers. The NQR experimental results are discussed. Cast plastic bonded explosives were made using the RDX and HMX obtained from the various manufacturers and subsequently subjected to the NOL large-scale gap test (LSGT). The results of the LSGT are discussed and correlated with the NQR results. A relationship between the crystal defect density and shock initiation pressure of the plastic bonded explosive is developed and discussed.

Caulder, S. M.; Buess, M. L.; Garroway, A. N.; Miller, P. J.

2004-07-01

51

Electronic properties of Y-Ba-Cu-O superconductors as seen by Cu and O NMR/NQR  

SciTech Connect

Nuclear Magnetic Resonance (NMR) and Nuclear Quadrupole Resonance (NQR) allow the investigation of electronic properties at the atomic level. The authors will report on such studies of typical members of the the Y-Ba-Cu-O family such as YBa2Cu30(6 + x) (1-2-3-(6 + x)), YBa2Cu4O8 (1-2-4) and Y2Ba4Cu7015 (2-4-7) with many examples of recent work performed in their laboratory. In particular, they will deal with Knight shift and relaxation studies of copper and oxygen. They will discuss important issues of current studies such as: (1) Existence of a common electronic spin-susceptibility in the planes (and perhaps in the chains) of 1-2-4; (2) Strong evidence for the existence of a pseudo spin-gap of the antiferromagnetic fluctuations in 1-2-4 and 2-4-7; (3) Evidence for d-wave pairing in 1-2-4; (4) Strong coupling of inequivalent Cu-O planes in 2-4-7 and possible origin for the high Tc value of this compound; and (5) The possibility to describe NMR data in the framework of a charge-excitation picture.

Brinkmann, D.

1995-04-01

52

Electronic properties of Y-Ba-Cu-O superconductors as seen by Cu and O NMR/NQR  

NASA Technical Reports Server (NTRS)

Nuclear Magnetic Resonance (NMR) and Nuclear Quadrupole Resonance (NQR) allow the investigation of electronic properties at the atomic level. We will report on such studies of typical members of the the Y-Ba-Cu-O family such as YBa2Cu30(6 + x) (1-2-3-(6 + x)), YBa2Cu4O8 (1-2-4) and Y2Ba4Cu7015 (2-4-7) with many examples of recent work performed in our laboratory. In particular, we will deal with Knight shift and relaxation studies of copper and oxygen. We will discuss important issues of current studies such as: (1) Existence of a common electronic spin-susceptibility in the planes (and perhaps in the chains) of 1-2-4; (2) Strong evidence for the existence of a pseudo spin-gap of the antiferromagnetic fluctuations in 1-2-4 and 2-4-7; (3) Evidence for d-wave pairing in 1-2-4; (4) Strong coupling of inequivalent Cu-O planes in 2-4-7 and possible origin for the high Tc value of this compound; and (5) The possibility to describe NMR data in the framework of a charge-excitation picture.

Brinkmann, D.

1995-01-01

53

Detection of {sup 14}N and {sup 35}Cl in cocaine base and hydrochloride using NQR, NMR, and SQUID techniques  

SciTech Connect

Results from {sup 14}N pure NQR of cocaine in the free base form (cocaine base) yield a nuclear quadrupole coupling constant (NQCC) e{sup 2}Qq/h of 5.0229 ({+-}0.0001) MHz and an asymmetry parameter {eta} of 0.0395 ({+-}0.0001) at 295 K, with corresponding values of 5.0460 ({+-}0.0013) MHz and 0.0353 ({+-}0.0008) at 77 K. Both pure NQR (at 295-77 K) and a superconducting quantum interference device (SQUID) detector (at 4.2 K) were used to measure the very low (<1 MHz) {sup 14}N transition frequencies in cocaine hydrochloride; at 295 K the NQCC is 1.1780 ({+-}0.0014) MHz and the asymmetry parameter is 0.2632 ({+-}0.0034). Stepping the carrier frequency enables one to obtain a powder pattern without the severe intensity distortions that otherwise arise from finite pulse power. A powder pattern simulation using an NQCC value of 5.027 MHz and an asymmetry parameter {eta} of 0.2 agrees reasonably well with the experimental stepped-frequency spectrum. The use of pure NQR for providing nondestructive, quantitative, and highly specific detection of crystalline compounds is discussed, as are experimental strategies. 31 refs., 8 figs., 1 tab.

Yesinowski, J.P.; Buess, M.L.; Garroway, A.N. [Naval Research Lab., Washington, DC (United States); Ziegeweid, M.; Pines, A. [Univ. of California, Berkeley, CA (United States)]|[Lawrence Berkeley Lab., CA (United States)

1995-07-01

54

I: Low Frequency NMR and NQR Using a dc SQUID. II: Variable-temperature 13C CP/MAS of Organometallics  

SciTech Connect

NMR and NQR at low frequencies are difficult prospects due to small nuclear spin polarization. Furthermore, the sensitivity'of the inductive pickup circuitry of standard spectrometers is reduced as the frequency is lowered. I have used a cw-SQUID (Superconducting QUantum Interference Device) spectrometer, which has no such frequency dependence, to study the local atomic environment of {sup 14}N via the quadrupolar interaction. Because {sup 14}N has spin I = 1 and a 0-6 MHz frequency range, it is not possible to obtain well-resolved spectra in high magnetic fields. I have used a technique to observe {sup 14}N NQR resonances via their effect on neighboring protons mediated by the heteronuclear dipolar interaction to study peptides and narcotics. The sensitivity of the SQUID is not enough to measure low-frequency surface (or other low spin density) systems. The application of spin-polarized xenon has been previously used to enhance polarization in conventional NMR experiments. Because xenon only polarizes spins with which it is in contact, it is surface selective. While differences in chemical shifts between surface and bulk spins are not large, it is expected that the differences in quadrupole coupling constant should be very large due to the drastic change of the electric field gradient surrounding spins at the surface. With this in mind, I have taken preliminary steps to measure SQUID detected polarization transfer from Xe to another spin species at 4.2 K and in small magnetic fields (<50 G). In this regime, the spin-lattice relaxation of xenon is dependent on the applied magnetic field. The results of our efforts to characterize the relaxation of xenon are presented. The final section describes the solid-state variable-temperature (VT) one- and two-dimensional {sup 13}C cross polarization (CP)/magic angle spinning (MAS) NMR of Hf({eta}{sup 5}-C{sub 5}H{sub 5}){sub 2}({eta}{sup 1}-C{sub 5}H{sub 5}){sub 2}, Zr({eta}{sup 5}-C{sub 5}H{sub 5}){sub 3}({eta}{sup 1}-C{sub 5}H{sub 5}) and Sn({eta}{sup 1}-C{sub 5}H{sub 5}){sub 4}. This work was undertaken in the hope of gaining insight into the intramolecuhrr dynamics, specifically which fluxional processes exist in the solid state, by what mechanism rearrangements are occurring, and the activation energies by which these processes are governed.

Ziegeweid, M.A.

1995-11-29

55

Magnetic correlations in La(2-x)Sr(x)CuO4 from NQR relaxation and specific heat  

NASA Technical Reports Server (NTRS)

La-139 and Cu-63 Nuclear Quadrupole Resonance (NQR) relaxation measurements in La(2-x)Sr(x)CuO4 for x ranging from 0 up to 0.3, with particular emphasis on the effect of doping on the Cu(2+) magnetic correlations and dynamics, are reviewed. In the low doping limit, x less than or equal to 0.05, the results can be interpreted consistently in terms of a simple phenomenological 'two-fluids' model whereby the effect of thermally-activated mobile O(2p) holes is the one of disrupting locally the Cu(2+) spin correlations. For x greater than or equal to 0.1, the results indicate the onset, as T approaches T(sub c)(+), of a strong coupling between Cu(2+) spins and the Fermi liquid of O(2p) holes leading to the apparent disappearance of localized Cu(2+) moment in connection with the opening of a superconducting gap.

Borsa, F.; Rigamonti, A.

1991-01-01

56

In-NQR study of heavy fermion superconductor Ce2PdIn8 under pressure  

NASA Astrophysics Data System (ADS)

115In nuclear quadrupole resonance measurements were performed in the normal state of the heavy fermion superconductor Ce2PdIn8 under hydrostatic pressure up to about 2.3 GPa. The observed behavior of the spin-lattice relaxation rate revealed a systematic suppression of antiferromagnetic critical fluctuations with increasing pressure.

Fukazawa, Hideto; Shimatani, Sho; Shigeta, Kazuhiko; Kohori, Yoh; Kaczorowski, Dariusz

2015-03-01

57

Magnetic correlations in La(2-x)Sr(x)CuO4 from NQR relaxation and specific heat  

NASA Technical Reports Server (NTRS)

La-139 and Cu-63 Nuclear Quadrupole Resonance (NQR) relaxation measurements in La(2-x)Sr(x)CuO4 for O = to or less than 0.3 and in the temperature range 1.6 + 450 K are analyzed in terms of Cu(++) magnetic correlations and dynamics. It is described how the magnetic correlations that would result from Cu-Cu exchange are reduced by mobile charge defects related to x-doping. A comprehensive picture is given which explains satisfactorily the x and T dependence of the correlation time, of the correlation length and of the Neel temperature T(sub n)(x) as well as being consistent with known electrical resistivity and magnetic susceptibility measurements. It is discussed how, in the superconducting samples, the mobile defects also cause the decrease, for T yields T(sub c)(+) of the hyperfine Cu electron-nucleus effective interaction, leading to the coexistence of quasi-localized, reduced magnetic moments from 3d Cu electrons and mobile oxygen p-hole carriers. The temperature dependence of the effective hyperfine field around the superconducting transition yields an activation energy which could be related to the pairing energy. New specific heat measurements are also presented and discussed in terms of the above picture.

Borsa, F.; Rigamonti, A.

1990-01-01

58

Zero-field NMR study on a spin glass: iron-doped 2H-niobium diselenide  

SciTech Connect

Spin echoes are used to study the /sup 93/Nb NQR in 2H-NbSe/sub 2/Fe/sub x/. Measured are (intensity) x (temperature), and T/sub 1P/ (spin-lattice relaxation parameter) and T/sub 2/ (spin-spin relaxation time) as a function of temperature. Data reveal dramatic differences between non-spin glass samples (x = 0, 0.25%, 1% and 5%) and spin glass samples (x = 8%, 10% and 12%). All of the NQR results and the model calculation of the correlation times of Fe spins are best described by the phase transition picture of spin glasses.

Chen, M C

1982-01-01

59

Density functional calculations of 14N and 11B NQR parameters in the H-capped (6,0) and (4,4) single-walled BN nanotubes  

NASA Astrophysics Data System (ADS)

Density functional theory (DFT) calculations were performed to calculate nitrogen-14 and boron-11 nuclear quadrupole resonance (NQR) spectroscopy parameters in the representative considered models of zigzag and armchair boron nitride nanotubes (BNNTs) for the first time. The considered models consisting of 1 nm length of H-capped (6,0) and (4,4) single-walled BNNT were first allowed to fully relax and then the NQR calculations were performed on the geometrically optimized models. The evaluated nuclear quadrupole coupling constants and asymmetry parameters for the mentioned nuclei reveal that the considered models can be divided into four layers of nuclei with an equivalent electrostatic environment where those nuclei at the ends of tubes have a very strong electrostatic environment compared to the other nuclei along the length of tubes. Those nuclei at the center of the tube length also have an equivalent electrostatic environment. The calculations were performed based on the B3LYP DFT method and 6-311G** and 6-311++G** standard basis sets using the Gaussian 98 package of program.

Mirzaei, Mahmoud; Hadipour, Nasser L.

2008-02-01

60

NQR investigation of pressure-induced charge transfer in oxygen-deficient YBa sub 2 Cu sub 3 O sub 7-. delta. (. delta. = 0. 38)  

SciTech Connect

Measurements of the pressure dependence of {sup 63}Cu nuclear quadrupole frequency in YBa{sub 2}Cu{sub 3}O{sub 6.62} from ambient pressure up to 1.5 GPa at 4k have been performed. {Tc} was found to increase with pressure: d{Tc}/dp {approximately} 5 K/GPa. All observed NQR lines are linear in pressure: dln{nu}{sub Q}/dp=z. We found positive z for the empty chain sites, consistent with ionic (Cu{sup 1+}) configuration in which the atom simply feels a squeezing lattice. Planar coppers close to the empty chains have positive z, while those that are close to full chains have z {approximately} 0. We present an analysis of the NQR result on the basis of the charge transfer model in which the mobile charges migrate from the chain to the plane sites. We deduced that a transfer of 0.021 holes to the O(2,3) sites would explain the result in YBa{sub 2}Cu{sub 3}O{sub 6.62}, whereas only 0.007 holes transfer in fully oxygenated YBa{sub 2}Cu{sub 3}O{sub 7}.

Reyes, A.P.; Ahrens, E.T.; Hammel, P.C.; Heffner, R.H. (Los Alamos National Lab., NM (United States)); Takigawa, M. (International Business Machines Corp., Yorktown Heights, NY (United States). Thomas J. Watson Research Center)

1992-01-01

61

Suppression of electron correlations in the collapsed tetragonal phase of CaFe2As2 under ambient pressure demonstrated by As75 NMR/NQR measurements  

SciTech Connect

The static and the dynamic spin correlations in the low-temperature collapsed tetragonal and the high-temperature tetragonal phase in CaFe2As2 have been investigated by As75 nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements. Through the temperature (T) dependence of the nuclear spin lattice relaxation rates (1/T1) and the Knight shifts, although stripe-type antiferromagnetic (AFM) spin correlations are realized in the high-temperature tetragonal phase, no trace of the AFM spin correlations can be found in the nonsuperconducting, low-temperature, collapsed tetragonal (cT) phase. Given that there is no magnetic broadening in As75 NMR spectra, together with the T-independent behavior of magnetic susceptibility ? and the T dependence of 1/T1T?, we conclude that Fe spin correlations are completely quenched statically and dynamically in the nonsuperconducting cT phase in CaFe2As2.

Furukawa, Yuji [Ames Laboratory; Roy, Beas [Ames Laboratory; Ran, Sheng [Ames Laboratory; Budko, Sergey L. [Ames Laboratory; Canfield, Paul C. [Ames Laboratory

2014-03-20

62

NQR Investigation of Anion Dynamics in Rb2Zn(Cl1 - xBrx)4  

NASA Astrophysics Data System (ADS)

The structural stability of Rb2Zn(Cl1 - xBrx)4 (x = 1% and 3%) is investigated using the 35Cl quadrupole resonance frequency and spin lattice relaxation time (T1Q) in the paraelectric (PE) phase. The PE to incommensurate (IC) phase transition temperature T1, observed at 302 K in the pure compound, is lowered to 300 K for x = 1 % and to 293 K for x = 3%. These effects are smaller than in the earlier reported case of 3% Cs substitution in Rb2ZnCl4 , which reduces T1 by 25 K. While bigger cation substitution affects only the barrier for anion dynamics about directions perpendicular to the a-axis (direction of low temperature IC modulation wave), bigger anion substitution is found to affect the barrier for anion dynamics about the a-axis as well. The present study also indicates that the cusp like dip in T1Q observed while approaching T1 from above (characterizing the soft mode condensation associated with the structural phase transition) is essentially unaffected by anion impurity substitution, in contrast to the case where bigger cation substitution tends to smear the transitional effects. These results seem to suggest the dominant role played by cations in stabilizing the PE phase of these A2BX4 systems, in comparison to anions.

Subramanian, R. K.; Maheswari, S. Uma; Venu, K.; Sastry, V. S. S.

1996-06-01

63

Hybridization-driven gap in U3Bi4Ni3: a 209Bi NMR/NQR study  

SciTech Connect

We report {sup 209}Bi nuclear-magnetic-resonance and nuclear-quadrupole-resonance measurements on a single crystal of the Kondo insulator U{sub 3}Bi{sub 4}Ni{sub 3}. The {sup 209}Bi nuclear-spin-lattice relaxation rate (T{sub 1}{sup -1}) shows activated behavior and is well fit by a spin gap of 220 K. The {sup 209}Bi Knight shift (K) exhibits a strong temperature dependence arising from 5f electrons, in which K is negative at high temperatures and increases as the temperature is lowered. Below 50 K, K shows a broad maximum and decreases slightly upon further cooling. Our data provide insight into the evolution of the hyperfine fields in a fully gapped Kondo insulator based on 5f electron hybridization.

Baek, Seung H [Los Alamos National Laboratory

2009-01-01

64

NQR investigation of pressure-induced charge transfer in oxygen-deficient YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} ({delta} = 0.38)  

SciTech Connect

Measurements of the pressure dependence of {sup 63}Cu nuclear quadrupole frequency in YBa{sub 2}Cu{sub 3}O{sub 6.62} from ambient pressure up to 1.5 GPa at 4k have been performed. {Tc} was found to increase with pressure: d{Tc}/dp {approximately} 5 K/GPa. All observed NQR lines are linear in pressure: dln{nu}{sub Q}/dp=z. We found positive z for the empty chain sites, consistent with ionic (Cu{sup 1+}) configuration in which the atom simply feels a squeezing lattice. Planar coppers close to the empty chains have positive z, while those that are close to full chains have z {approximately} 0. We present an analysis of the NQR result on the basis of the charge transfer model in which the mobile charges migrate from the chain to the plane sites. We deduced that a transfer of 0.021 holes to the O(2,3) sites would explain the result in YBa{sub 2}Cu{sub 3}O{sub 6.62}, whereas only 0.007 holes transfer in fully oxygenated YBa{sub 2}Cu{sub 3}O{sub 7}.

Reyes, A.P.; Ahrens, E.T.; Hammel, P.C.; Heffner, R.H. [Los Alamos National Lab., NM (United States); Takigawa, M. [International Business Machines Corp., Yorktown Heights, NY (United States). Thomas J. Watson Research Center

1992-03-01

65

Zeeman Effect Study of the Nuclear Quadrupole Resonance of 81Br in 4,4'-Dibromodiphenylether and 4,4'-Dibromodiphenylether  

Microsoft Academic Search

The Zeeman effect of the 81Br NQR line was studied on single crystals of 4,4?-dibromodiphenylether and 4,4?-dibromodiphenylthioether. The relative orientations of the electric-field-gradient tensors acting upon the Br nuclei in the same molecule have been determined. The angle between the two Z-axis directions is 129°0? ± 5? in the former compound and 107°15? ± 4? in the latter. The angle

R. Ambrosetti; R. Angelone; P. Cecchi; A. Colligiani

1971-01-01

66

Nuclear quadrupole resonances in compact vapor cells: the crossover from the NMR to the NQR interaction regimes  

E-print Network

We present the first experimental study that maps the transformation of nuclear quadrupole resonances from the pure nuclear quadrupole regime to the quadrupole-perturbed Zeeman regime. The transformation presents an interesting quantum-mechanical problem, since the quantization axis changes from being aligned along the axis of the electric-field gradient tensor to being aligned along the magnetic field. We achieve large nuclear quadrupole shifts for I = 3/2 131-Xe by using a 1 mm^3 cubic cell with walls of different materials. When the magnetic and quadrupolar interactions are of comparable size, perturbation theory is not suitable for calculating the transition energies. Rather than use perturbation theory, we compare our data to theoretical calculations using a Liouvillian approach and find excellent agreement.

E. A. Donley; J. L. Long; T. C. Liebisch; E. R. Hodby; T. A. Fisher; J. Kitching

2008-12-10

67

Topology of the interactions pattern in pharmaceutically relevant polymorphs of methylxanthines (caffeine, theobromine, and theophiline): combined experimental (¹H-¹?N nuclear quadrupole double resonance) and computational (DFT and Hirshfeld-based) study.  

PubMed

Three anhydrous methylxanthines: caffeine (1,3,7-trimethylxanthine; 1,3,7-trimethyl-1H-purine-2,6-(3H,7H)-dione) and its two metabolites theophylline (1,3-dimethylxanthine; 1,3-dimethyl-7H-purine-2,6-dione) and theobromine (3,7-dimethyl-xanthine; 3,7-dimethyl-7H-purine-2,6-dione), which reveal multifaceted therapeutic potential, have been studied experimentally in solid state by (1)H-(14)N NMR-NQR (nuclear magnetic resonance-nuclear quadrupole resonance) double resonance (NQDR). For each compound the complete NQR spectrum consisting of 12 lines was recorded. The multiplicity of NQR lines indicates the presence of a stable ? form of anhydrous caffeine at 233 K and stable form II of anhydrous theobromine at 213 K. The assignment of signals detected in NQR experiment to particular nitrogen atoms was made on the basis of quantum chemistry calculations performed for monomer, cluster, and solid at the DFT/GGA/BLYP/DPD level. The shifts due to crystal packing interactions were evaluated, and the multiplets detected by NQR were assigned to N(9) in theobromine and N(1) and N(9) in caffeine. The ordering theobromine > theophylline > caffeine site and theophylline < theobromine < caffeine according to increasing electric field gradient (EFG) at the N(1) and N(7) sites, respectively, reflects the changes in biological activity profile of compounds from the methylxanthines series (different pharmacological effects). This difference is elucidated on the basis of the ability to form intra- and intermolecular interactions (hydrogen bonds and ?···? stacking interactions). The introduction of methyl groups to xanthine restricts the ability of nitrogen atoms to participate in strong hydrogen bonds; as a result, the dominating effect shifts from hydrogen bond (theobromine) to ?···? stacking (caffeine). Substantial differences in the intermolecular interactions in stable forms of methylxanthines differing in methylation (site or number) were analyzed within the Hirshfeld surface-based approach. The analysis of local environment of the nitrogen nucleus permitted drawing some conclusions on the nature of the interactions required for effective processes of recognition and binding of a given methylxanthine to A1-A(2A) receptor (target for caffeine in the brain). Although the interactions responsible for linking neighboring methylxanthines molecules in crystals and methylxanthines with targets in the human organism can differ significantly, the knowledge of the topology of interactions provides reliable preliminary information about the nature of this binding. PMID:25184363

Latosi?ska, Jolanta Natalia; Latosi?ska, Magdalena; Olejniczak, Grzegorz A; Seliger, Janez; Žagar, Veselko

2014-09-22

68

Nuclear Quadrupole Resonance Studies of the Sorc Sequence and Nuclear Magnetic Resonance Studies of Polymers.  

NASA Astrophysics Data System (ADS)

The behavior of induction signals during steady -state pulse irradiation in ^{14} N NQR was investigated experimentally. Because Strong Off-resonance Comb (SORC) signals recur as long as the pulsing continues, very efficient signal-averaging can result. The dependence of these steady-state SORC signals on pulse parameters and on frequency offset are presented, together with a discussion of the applicability of the method. Also as part of the NQR work, Cocaine base has been detected using conventional NQR techniques. The experimental results show that SORC detection can be of sufficient sensitivity to form the basis of narcotics screening devices for both mail and airline baggage. A new NMR technique, to obtain the correlation time of the random thermal motion of a polymer at temperatures near the glass transition has been introduced. The temperature dependence is a result of thermal motion. For slow-motion of a polymer chain near the glass transition, the CSA parameter begins to decrease. This motional narrowing can be interpreted to yield the correlation time of the thermal motion. In this work Nitrocellulose isotopically highly enriched with ^{15}N was studied at four different temperatures between 27^ circ and 120^circ Celsius and the correlation times for polymer backbone motions were obtained. Nafion films containing, water (D_2 O and H_2^{17}O) and methanol (CH_3OD, CH _3^{17}OH), have been studied using Deuteron and Oxygen-17 NMR spectroscopy. Glassy behavior of the water domains at low temperature is evidenced by the specific nature of the ^2H NMR lineshapes. Activation energies extracted from ^2H spin-lattice relaxation data on the high temperature side of the T_1 minimum exhibit a steady increase with increasing water content. In spite of a high degree of molecular mobility, angular-dependent spectra of both unstretched and stretched samples reflect considerable anisotropy of the host polymer. Activation volumes corresponding to a specific dynamical process were obtained from measurements of spin-lattice relaxation vs. pressure. From the NMR measurements of Nafion films containing methanol, it was found that the molecular motion is much more rapid than the molecular motion of water in Nafion membranes.

Jayakody, Jayakody R. Pemadasa

1993-01-01

69

Order-disorder effects of small guests in clathrates studied by nuclear quadrupole resonance and crystallography. Part I. Carbon tetrachloride and related molecules in Ni(SCN) 2 (3-methylpyridine) 4  

Microsoft Academic Search

NQR spectroscopy and X-ray crystallography have been jointly applied to the study of the small guest molecules CH2Cl2, CHCl3, CCl4, CBr2Cl2, C(CH3)2Cl2 etc. in the Werner host complex Ni(SCN)2(3-methylpyridine)4. Specific host-guest dipole-dipole interactions play an important role in order-disorder effects for guest molecules in the cavities of orthorhombic system,Fddd. Thus a weakly polar molecule such as CBr2Cl2 exhibits a disordered

Li Pang; Edwin A. C. Lucken; Gérald Bernardinelli

1992-01-01

70

Nuclear quadrupole resonance studies of amorphous, orthorhombic, and rhombohedral arsenic  

Microsoft Academic Search

Pulsed nuclear quadrupole resonance (NQR) experiments have been performed on three forms of elemental arsenic: amorphous (a), rhombohedral (rh), and orthorhombic (or). The temperature dependence of the spin-lattice relaxation time (T1) provides evidence for the existence of disorder (tunneling) modes in a-As. It is found that the NQR line shape of a-As is highly asymmetric, and this asymmetry is attributed

G. E. Jellison Jr.; G. L. Petersen; P. C. Taylor

1980-01-01

71

Nuclear quadrupole resonance studies of amorphous, orthorhombic, and rhombohedral arsenic  

Microsoft Academic Search

Pulsed nuclear quadrupole resonance (NQR) experiments have been performed on three forms of elemental arsenic: amorphous (a), rhombohedral (rh), and orthorhombic (or). The temperature dependence of the spin-lattice relaxation time (Tâ) provides evidence for the existence of disorder (tunneling) modes in a-As. It is found that the NQR line shape of a-As is highly asymmetric, and this asymmetry is attributed

G. E. Jr. Jellison; G. L. Petersen; P. C. Taylor

1980-01-01

72

13C CP MAS NMR and DFT study of vascular-selective drugs felodipine and amlodipine  

NASA Astrophysics Data System (ADS)

Amlodipine besylate (AM) and felodipine (FL) have been studied in solid by 13C CP MAS NMR and DFT. The spectra have been successfully reproduced from the theoretical calculations of the nuclear magnetic shielding tensors, using the GIAO method, after the SCF partial geometry optimisation. A very good correlation between the 13C chemical shifts and quadrupole coupling constants for chlorobenzene, AM and FL was obtained. 13C NMR as well as 35Cl NQR do not differentiate between S and R enantiomers of AM and FL due to the symmetry of the 4-aryl ring comprising one (AM) or two (FL) chlorine atoms oriented in a perpendicular fashion over the 1,4-DHP ring.

Latosi?ska, J. N.

2008-09-01

73

Computational studies on boron nitride and boron phosphide nanotubes: Density functional calculations of boron-11 electric field gradient tensors  

NASA Astrophysics Data System (ADS)

We have performed density functional theory (DFT) calculations employing BLYP exchange functional and 6-31 G * standard basis set by GAUSSIAN 98 package of program. The electronic structure properties of representative zigzag and armchair models of boron nitride nanotube (BNNT) and boron phosphide nanotube (BPNT) have been studied. The (6,0) and (4,4) structures have been optimized and the electric field gradient (EFG) tensors have been calculated at the sites of various boron-11 nuclei. The calculated EFG tensors have been converted to the equivalent experimental nuclear quadrupole resonance (NQR) parameters, quadrupole coupling constant and asymmetry parameter. The results revealed that the boron atoms at the edges of nanotubes play dominant roles in determining the electronic behaviors of BNNT and BPNT. The average of the calculated values of quadrupole coupling constants at the sites of boron-11 nuclei is in good agreement with experiments.

Mirzaei, Mahmoud; Giahi, Masoud

2010-03-01

74

Origin and Evolution of the Sodium -Pumping NADH: Ubiquinone Oxidoreductase  

PubMed Central

The sodium -pumping NADH: ubiquinone oxidoreductase (Na+-NQR) is the main ion pump and the primary entry site for electrons into the respiratory chain of many different types of pathogenic bacteria. This enzymatic complex creates a transmembrane gradient of sodium that is used by the cell to sustain ionic homeostasis, nutrient transport, ATP synthesis, flagellum rotation and other essential processes. Comparative genomics data demonstrate that the nqr operon, which encodes all Na+-NQR subunits, is found in a large variety of bacterial lineages with different habitats and metabolic strategies. Here we studied the distribution, origin and evolution of this enzymatic complex. The molecular phylogenetic analyses and the organizations of the nqr operon indicate that Na+-NQR evolved within the Chlorobi/Bacteroidetes group, after the duplication and subsequent neofunctionalization of the operon that encodes the homolog RNF complex. Subsequently, the nqr operon dispersed through multiple horizontal transfer events to other bacterial lineages such as Chlamydiae, Planctomyces and ?, ?, ? and ? -proteobacteria. Considering the biochemical properties of the Na+-NQR complex and its physiological role in different bacteria, we propose a detailed scenario to explain the molecular mechanisms that gave rise to its novel redox- dependent sodium -pumping activity. Our model postulates that the evolution of the Na+-NQR complex involved a functional divergence from its RNF homolog, following the duplication of the rnf operon, the loss of the rnfB gene and the recruitment of the reductase subunit of an aromatic monooxygenase. PMID:24809444

Reyes-Prieto, Adrian; Barquera, Blanca; Juárez, Oscar

2014-01-01

75

Detecting body cavity bombs with nuclear quadrupole resonance  

NASA Astrophysics Data System (ADS)

Nuclear Quadrupole Resonance (NQR) is a technology with great potential for detecting hidden explosives. Past NQR research has studied the detection of land mines and bombs concealed within luggage and packages. This thesis focuses on an NQR application that has received less attention and little or no publicly available research: detecting body cavity bombs (BCBs). BCBs include explosives that have been ingested, inserted into orifices, or surgically implanted. BCBs present a threat to aviation and secure facilities. They are extremely difficult to detect with the technology currently employed at security checkpoints. To evaluate whether or not NQR can be used to detect BCBs, a computational model is developed to assess how the dielectric properties of biological tissue affect the radio frequency magnetic field employed in NQR (0.5-5MHz). The relative permittivity of some biological tissue is very high (over 1,000 at 1MHz), making it conceivable that there is a significant effect on the electromagnetic field. To study this effect, the low-frequency approximation known as the Darwin model is employed. First, the electromagnetic field of a coil is calculated in free space. Second, a dielectric object or set of objects is introduced, and the free-space electric field is modified to accommodate the dielectric object ensuring that the relevant boundary conditions are obeyed. Finally, the magnetic field associated with the corrected electric field is calculated. This corrected magnetic field is evaluated with an NQR simulation to estimate the impact of dielectric tissue on NQR measurements. The effect of dielectric tissue is shown to be small, thus obviating a potential barrier to BCB detection. The NQR model presented may assist those designing excitation and detection coils for NQR. Some general coil design considerations and strategies are discussed.

Collins, Michael London

76

Nuclear Quadrupole Resonance Zeeman Study of paraChlorophenol  

Microsoft Academic Search

The major field gradient directions for Cl in para-chlorophenol as determined by NQR and x-ray diffraction are compared quantitatively, and found to agree. The minor field gradient directions are examined qualitatively, and are consistent with those predicted on the basis of Cl&sngbnd;C partial double bonding. From a measurement of the field gradient asymmetry parameter &eegr;, the degree of chlorine—carbon double

G. E. Peterson; P. M. Bridenbaugh

1967-01-01

77

Pulsed Bromine-81 Nuclear Quadrupole Resonance Spectroscopy of Brominated Flame Retardants and Associated Polymer Blends.  

NASA Astrophysics Data System (ADS)

The dispersion of brominated flame retardants in polymers is monitored with bromine-81 NQR using a pulse NQR spectrometer. The NQR spectrometer consists of a homemade 10-300 MHz single-channel NMR console coupled to a broadly tunable probe. The probe is a loop-gap resonator usable from 220 to 300 MHz, and automatically tuned over any 5 MHz region with a stepping motor and an RF bidirectional coupler. Bromine-81 NQR spectra of several brominated aromatic flame retardants, as pure materials and in polymers, were recorded in the range of 227 to 256 MHz in zero applied magnetic field. Two factors affect the bromine-79/81 NQR transition frequencies in brominated aromatics: electron withdrawing substituents on the ring and intermolecular contacts with other bromine atoms in the crystal structure. An existing model for substituents is updated and a point charge model for the intermolecular contacts is developed. In this study, we exploit the bromine-81 NQR transition frequency dependence on intermolecular contacts to learn how a flame retardant is dispersed in a polymer matrix.

Mrse, Anthony A.; Lee, Youngil; Bryant, Pamela L.; Fronczek, Frank R.; Butler, Leslie G.; Simeral, Larry S.

1998-03-01

78

Nuclear-quadrupole double-resonance study of RbH2PO4 in the supercooled high-temperature monoclinic phase  

NASA Astrophysics Data System (ADS)

Rubidium nuclear-quadrupole-resonance (NQR) spectra have been measured in the high-temperature monoclinic phase of RbH2PO4 above Tp=86 °C and also in the supercooled high-temperature phase below Tp. At the transition into the high-temperature phase, the rubidium quadrupole-coupling constants drop by a factor of 5. The high-temperature phase is metastable below Tp. The kinetics of the transformation of the metastable phase into the stable tetragonal phase in a polycrystalline sample is determined at room temperature from the time dependence of the rubidium NQR spectra. A comparison of the present rubidium NQR data in the high-temperature monoclinic RbH2PO4 with the rubidium NQR data in monoclinic RbD2PO4 suggests that at low temperatures, supercooled monoclinic RbH2PO4 may be isostructural with the phase III of monoclinic RbD2PO4 whereas above Tp RbH2PO4 may be isostructural with phase II of RbD2PO4.

Seliger, J.; Žagar, V.; Blinc, R.

1993-06-01

79

Using nitrogen-14 nuclear quadrupole resonance and electric field gradient information for the study of radiation effects  

SciTech Connect

Nitrogen-14 nuclear quadrupole resonance (NQR) was used in an attempt to detect the effects of ionizing radiation on organic material. Previously reported resonances for urea were detected at 2,913.32 {+-} 0.01 kHz and 2,347.88 {+-} 0.08 kHz with associated T{sub 2}* values 780 {+-} 20 {micro}s and 523 {+-} 24 {micro}s, respectively. The previously unreported {nu}{sub {minus}} line for urea-d{sup 4} was detected at 2,381 {+-} 0.04 Khz and used to determine accurately for the first time the values for the nuclear quadrupole coupling constant {chi} (3,548.74 {+-} 0.03 kHz) and the asymmetry parameter {eta} (0.31571 {+-} 0.00007) for urea-d{sup 4}. The inverse linewidth parameter T{sub 2}* for {nu}{sub +} was measured at 928 {+-} 23 {micro}s and for {nu}{sub {minus}} at 721 {+-} 12 {micro}s. Townes and Dailey analysis was performed and urea-d{sup 4} exhibits a 0.004 increase in lone pair electronic density and a slight decrease in N-H bond electronic density, as compared to urea, probably due to the mass difference. A relationship is proposed, referred to as NQR linewidth analysis, between the dynamic spin relaxation times T{sub 2} and T{sub 2}* and the widths of the distributions of the NQR parameters. Linewidth analysis is presented as a tool for possible use in future NQR work in all area, not just radiation effects. This relationship is tested using sodium nitrite T{sub 2} and T{sub 2}* values for {nu}{sub {minus}} and {nu}{sub {minus}} as a function of temperature.

Iselin, L.H.

1995-12-01

80

Solid-state (185/187)Re NMR and GIPAW DFT study of perrhenates and Re2(CO)10: chemical shift anisotropy, NMR crystallography, and a metal-metal bond.  

PubMed

Advances in solid-state nuclear magnetic resonance (SSNMR) methods, such as dynamic nuclear polarization (DNP), intricate pulse sequences, and increased applied magnetic fields, allow for the study of systems which even very recently would be impractical. However, SSNMR methods using certain quadrupolar probe nuclei (i.e., I > 1/2), such as (185/187)Re remain far from fully developed due to the exceedingly strong interaction between the quadrupole moment of these nuclei and local electric field gradients (EFGs). We present a detailed high-field (B0 = 21.1 T) experimental SSNMR study on several perrhenates (KReO4, AgReO4, Ca(ReO4)2·2H2O), as well as ReO3 and Re2(CO)10. We propose solid ReO3 as a new rhenium SSNMR chemical shift standard due to its reproducible and sharp (185/187)Re NMR resonances. We show that for KReO4, previously poorly understood high-order quadrupole-induced effects (HOQIE) on the satellite transitions can be used to measure the EFG tensor asymmetry (i.e., ?Q) to nearly an order-of-magnitude greater precision than competing SSNMR and nuclear quadrupole resonance (NQR) approaches. Samples of AgReO4 and Ca(ReO4)2·2H2O enable us to comment on the effects of counter-ions and hydration upon Re(vii) chemical shifts. Calcium-43 and (185/187)Re NMR tensor parameters allow us to conclude that two proposed crystal structures for Ca(ReO4)2·2H2O, which would be considered as distinct, are in fact the same structure. Study of Re2(CO)10 provides insights into the effects of Re-Re bonding on the rhenium NMR tensor parameters and rhenium oxidation state on the Re chemical shift value. As overtone NQR experiments allowed us to precisely measure the (185/187)Re EFG tensor of Re2(CO)10, we were able to measure rhenium chemical shift anisotropy (CSA) for the first time in a powdered sample. Experimental observations are supported by gauge-including projector augmented-wave (GIPAW) density functional theory (DFT) calculations, with NMR tensor calculations also provided for NH4ReO4, NaReO4 and RbReO4. These calculations are able to reproduce many of the experimental trends in rhenium ?iso values and EFG tensor magnitudes. Using KReO4 as a prototypical perrhenate-containing system, we establish a correlation between the tetrahedral shear strain parameter (|?|) and the nuclear electric quadrupolar coupling constant (CQ), which enables the refinement of the structure of ND4ReO4. Shortcomings in traditional DFT approaches, even when including relativistic effects via the zeroth-order regular approximation (ZORA), for calculating rhenium NMR tensor parameters are identified for Re2(CO)10. PMID:25790263

Widdifield, Cory M; Perras, Frédéric A; Bryce, David L

2015-04-01

81

Ferromagnetic critical behavior in U(Co1-xFex)Al (0 ?x ?0.02 ) studied by 59Co nuclear quadrupole resonance measurements  

NASA Astrophysics Data System (ADS)

In order to investigate physical properties around a ferromagnetic (FM) quantum transition point and a tricritical point (TCP) in the itinerant-electron metamagnetic compound UCoAl, we have performed the 59Co nuclear quadrupole resonance (NQR) measurement for the Fe-substituted U(Co1-xFex)Al(x =0 ,0.5 ,1 ,and2 %) in zero external magnetic field. The Fe concentration dependence of 59Co -NQR spectra at low temperatures indicates that the first-order FM transition occurs at least above x =1 % . The magnetic fluctuations along the c axis detected by the nuclear spin-spin relaxation rate 1 /T2 exhibit an anomaly at Tmax˜20 K and enhance with increasing x . These results are in good agreement with theoretical predictions and indicate the presence of prominent critical fluctuations at the TCP in this system.

Karube, K.; Hattori, T.; Ishida, K.; Kimura, N.

2015-02-01

82

Nuclear magnetic resonance studies of quadrupolar nuclei and dipolar field effects  

SciTech Connect

Experimental and theoretical research conducted in two areas in the field of nuclear magnetic resonance (NMR) spectroscopy is presented: (1) studies of the coherent quantum-mechanical control of the angular momentum dynamics of quadrupolar (spin I > 1/2) nuclei and its application to the determination of molecular structure; and (2) applications of the long-range nuclear dipolar field to novel NMR detection methodologies.The dissertation is organized into six chapters. The first two chapters and associated appendices are intended to be pedagogical and include an introduction to the quantum mechanical theory of pulsed NMR spectroscopy and the time dependent theory of quantum mechanics. The third chapter describes investigations of the solid-state multiple-quantum magic angle spinning (MQMAS) NMR experiment applied to I = 5/2 quadrupolar nuclei. This work reports the use of rotary resonance-matched radiofrequency irradiation for sensitivity enhancement of the I = 5/2 MQMAS experiment. These experiments exhibited certain selective line narrowing effects which were investigated theoretically.The fourth chapter extends the discussion of multiple quantum spectroscopy of quadrupolar nuclei to a mostly theoretical study of the feasibility of enhancing the resolution of nitrogen-14 NMR of large biomolecules in solution via double-quantum spectroscopy. The fifth chapter continues to extend the principles of multiple quantum NMR spectroscopy of quadrupolar nuclei to make analogies between experiments in NMR/nuclear quadrupolar resonance (NQR) and experiments in atomic/molecular optics (AMO). These analogies are made through the Hamiltonian and density operator formalism of angular momentum dynamics in the presence of electric and magnetic fields.The sixth chapter investigates the use of the macroscopic nuclear dipolar field to encode the NMR spectrum of an analyte nucleus indirectly in the magnetization of a sensor nucleus. This technique could potentially serve as an encoding module for the recently developed NMR remote detection experiment. The feasibility of using hyperpolarized xenon-129 gas as a sensor is discussed. This work also reports the use of an optical atomic magnetometer to detect the nuclear magnetization of Xe-129 gas, which has potential applicability as a detection module for NMR remote detection experiments.

Urban, Jeffry Todd

2004-12-21

83

On the crystal structures of some protonic complexes of oxo-ligands with tetrachloroauric acid, [(RO) n H][AuCl 4] (R: Py, Ph 3As; n: 1, 2), prepared from deuterated and non-deuterated solvent systems  

Microsoft Academic Search

The possible structural change of the dimeric cations [(RO)nH]+ (R=Py, Ph3As) in [(RO)nH][AuCl4] crystals due to the lowering of temperature or hydrogen–deuterium exchange was studied by 35Cl NQR and powder X-ray diffraction measurements. Temperature dependence of the nuclear quadrupole resonance (NQR) frequencies of [(Ph3AsO)2H][AuCl4] and [(PyO)2H][AuCl4] suggested the symmetric hydrogen bond was retained down to 4.2 K. A crystalline polymorph

Tetsuo Asaji; Fukue Tajima; Masao Hashimoto

2002-01-01

84

Low-frequency nuclear quadrupole resonance with a dc SQUID  

SciTech Connect

Conventional pure nuclear quadrupole resonance (NQR) is a technique well suited for the study of very large quadrupolar interactions. Numerous nuclear magnetic resonance (NMR) techniques have been developed for the study of smaller quadrupolar interactions. However, there are many nuclei which have quadrupolar interactions of intermediate strength. Quadrupolar interactions in this region have traditionally been difficult or unfeasible to detect. This work describes the development and application of a SQUID NQR technique which is capable of measuring intermediate strength quadrupolar interactions, in the range of a few hundred kilohertz to several megahertz. In this technique, a dc SQUID (Superconducting QUantum Interference Device) is used to monitor the longitudinal sample magnetization, as opposed to the transverse magnetization, as a rf field is swept in frequency. This allows the detection of low-frequency nuclear quadrupole resonances over a very wide frequency range with high sensitivity. The theory of this NQR technique is discussed and a description of the dc SQUID system is given. In the following chapters, the spectrometer is discussed along with its application to the study of samples containing half-odd-integer spin quadrupolar nuclei, in particular boron-11 and aluminum-27. The feasibility of applying this NQR technique in the study of samples containing integer spin nuclei is discussed in the last chapter. 140 refs., 46 figs., 6 tabs.

Chang, J.W.

1991-07-01

85

STUDY ABROAD STUDY ABROAD  

E-print Network

STUDY ABROAD STUDY ABROAD DEPARTMENT OF HISTORY FOR HISTORY MAJORS #12;WHY YOU SHOULD STUDY ABROAD 2 STUDY ABROAD FOR HISTORY MAJORS Study abroad programs provide History majors the opportunity students is provided within this brochure. AFFORDABILITY Consider the real cost of studying abroad

Johnston, Daniel

86

F-doping dependence of 75As nuclear quadrupole resonance frequency in LaFeAs(O1-xFx)  

NASA Astrophysics Data System (ADS)

We report the F-doping dependence of 75As nuclear quadruple resonance frequency (75?Q) in the iron-oxypnictide LaFeAs(O1-xFx) (x = 0, 0.07, 0.08, 0.11 and 0.14). It was revealed that 75?Q becomes larger with increasing x up to 0.14. From point charge calculations, we found that experimental F-doping dependence of 75?Q cannot be accounted for by the effect of surrounding ions. Therefore, the on-site charge distribution at the 75As site modified by the hybridization between As-4p and Fe-3d orbitals gives dominant contribution to 75?Q in LaFeAs(O1-xFx).

Kitagawa, S.; Nakai, Y.; Iye, T.; Ishida, K.; Kamihara, Y.; Hirano, M.; Hosono, H.

2010-12-01

87

Microscopic magnetic nature of water absorbed Na0.35CoO2 investigated by NMR, NQR and ?+SR  

NASA Astrophysics Data System (ADS)

In order to clarify the variation of the microscopic magnetic nature with the carrier density in NaxCoO2·yHO, we have measured positive muon-spin rotation/relaxation (?+SR) spectra for H2O as well as D2O absorbed samples. Based on the zero field (ZF-) ?+SR measurements, there was no clear difference between the two superconducting phases (SC-I and SC-II). Furthermore, the ZF-spectrum for the H2O absorbed sample exhibits a clear oscillation in the whole T range measured (1.4-100 K), suggesting the formation of “[H3O]+-like” H2?+O ions in the sample. Further, the absence of an oscillation in the D2O absorbed sample also evidences the presence of H2?+O. We also measured 59Co nuclear quadrupole resonance spectra of magnetic sample. The temperature dependence of spectra shows that there is no evidence of charge ordering and CDW ordering around magnetic transition temperature.

Ohta, Hiroto; Månsson, Martin; Ikedo, Yutaka; Sugiyama, Jun; Michioka, Chishiro; Yoshimura, Kazuyoshi; Brewer, Jess H.; Ansaldo, Eduardo J.; Stubbs, Scott L.; Chow, Kim H.; Lord, James S.

2010-12-01

88

Zero-field splittings of NQR spectra for bismuth(III) oxy compounds revealed by quadrupole spin echo envelopes  

Microsoft Academic Search

Local magnetic fields up to 250 G were earlier found by measuring the NQI parameters in bismuth(III) oxy compounds conventionally\\u000a considered as diamagnets, a strong increase in the 209Bi line intensities being observed in external magnetic fields. An approach based on registration of the quadrupole spin-echo\\u000a envelopes enabled to reveal small (within an inhomogeneous line broadening) splittings in some other compounds

E. A. Kravchenko; V. G. Orlov; V. G. Morgunov; M. P. Shlykov

2007-01-01

89

Africana Studies Film Studies  

E-print Network

CENTER EVENT OVAL Anthropology Dance Economics Human Rights Studies Physical Education Political Science COURTYARD LEHMAN LAWN Architecture Art History Classics & Ancient Studies Music Philosophy Religion DIANA Computer Science Environmental Science Mathematics Physics & Astronomy Statistics In the event of rain

90

AMERICAN STUDIES &AMERICAN STUDIES &AMERICAN STUDIES & ETHNICITYETHNICITYETHNICITY  

E-print Network

AMERICAN STUDIES &AMERICAN STUDIES &AMERICAN STUDIES & ETHNICITYETHNICITYETHNICITY This major, and social issues of the Western United States. It covers critical perspectives on regional, ethnic, class: Introduction to American Studies and Ethnicity -- Introduction to American studies and ethnic studies. Provides

Krylov, Anna I.

91

Zeeman Effect of the Nuclear Quadrupole Resonance of 81Br in para-Bromophenol and 35Cl in paraChlorophenol  

Microsoft Academic Search

The Zeeman effect of the 81Br and 35Cl nuclear quadrupole resonance has been studied with high precision on single crystals of para-bromophenol and para-chlorophenol, respectively. The results substantially agree with previous x-ray and NQR studies of para-chlorophenol (x-ray studies are known only for this substance). In p-bromophenol, four physically inequivalent sites were found, instead of two, as reported by other

P. Bucci; P. Cecchi; A. Colligiani

1969-01-01

92

ATBC Study - Study Details  

Cancer.gov

The Alpha-Tocopherol, Beta-Carotene Cancer Prevention (ATBC) Study was conducted in Finland as a joint project between the National Institute for Health and Welfare of Finland and the US National Cancer Institute (NCI) . The overall design, rationale, objectives, and initial results of this intervention study have been published1,2. Briefly, this was a randomized, double-blind, placebo-controlled, primary prevention trial to determine whether daily supplementation with alpha-tocopherol, beta-carotene, or both would reduce the incidence of lung or other cancers among male smokers.

93

Analysis of nuclear-quadrupole-resonance spectrum of incommensurate phases: The case of bis(4-chlorophenyl) sulfone  

Microsoft Academic Search

In this work, previous experimental studies of the 35Cl nuclear-quadrupole-resonance (NQR) line shape in the incommensurate phase of bis(4-chlorophenyl) sulfone were extended. The broad spectra in the incommensurate phase (IC) were measured using the Fourier transform of the nuclear signal to avoid systematic errors committed in some studies of this compound. The results were interpreted within the framework of the

J. Schneider; C. Schürrer; A. Wolfenson; A. Brunetti

1998-01-01

94

Mixed radiation field dosimetry utilizing Nuclear Quadrupole Resonance  

SciTech Connect

This project has proposed to develop a novel dosimetry system that is capable of directly evaluating the chemical/biological damage caused by neutrons, photons, or both in a single measurement. The dosimeter itself will consist of a small volume of biological equivalent material that is probed for radiation damage with Nuclear Quadrupole Resonance (NQR) techniques. NQR has previously been utilized as a sensitive probe of structural and chemical changes at the molecular level for a variety of organic compounds. The biological equivalent materials used in this study will not only have a density similar to tissue (tissue equivalent) but will have the same atomic components as tissue. This is a significant requirement if the important neutron interactions that occur in tissue are to occur in the dosimeter as well. The overall objective of this study is to investigate a methodology to perform accurate mixed-field (neutron and photon) dosimetry for biological systems.

Hintenlang, D.

1991-01-01

95

Dynamic heterogeneity in the glass-like monoclinic phases of some halogen methane compounds  

NASA Astrophysics Data System (ADS)

In this work we study the heterogeneity of the dynamics on the low-temperature monoclinic phases of the simple molecular glassy systems CBrnCl4-n, n = 0, 1, 2. In these systems the disorder comes exclusively from reorientational jumps mainly around the C3 molecular axes. The different time scales are determined by means of the analysis of the spin-lattice relaxation time obtained through Nuclear Quadrupole Resonance (NQR) technique. Results are compared with those obtained from dielectric spectroscopy, from which two ?- and ?-relaxation times appear. NQR results enable us to ascribe with no doubt that the existence of two relaxations is due to dynamical heterogeneities which are the consequence of the different molecular surroundings of the molecules in the asymmetric unit cell of systems here studied.

Zuriaga, M. J.; Perez, S. C.; Pardo, L. C.; Tamarit, J. Ll.

2013-02-01

96

Determination of the sign of the electric field gradient in indium by nuclear resonance  

SciTech Connect

The authors have studied the temperature dependence of two of the four magnetic-field perturbed NQR lines in indium. Their results indicate that the sign of the internal electric field gradient (EFG) is positive, in accord with the recent heat capacity measurements of the ISSP group and one recent theoretical prediction. They also discuss the implications of the sign of the EFG on the use of indium as an absolute thermometer below 1 mK.

Pollack, L.; Smith, E.N.; Richardson, R.C. [Cornell Univ., Ithaca, NY (United States)

1997-01-01

97

Zeeman effect of nuclear quadrupole resonance in 1-chloro-2,4-dinitrobenzene  

Microsoft Academic Search

The Zeeman effect of NQR was studied in 1-chloro-2,4-dinitrobenzene. A low value of the asymmetry parameter (0.10) was obtained. Four physically inequivalent field gradients were located and their orientations in the crystallographic abc system were determined using symmetry considerations. From these data the orientations of the molecules in the unit cell were determined. The results agree well with the two-dimensional

M. S. Vijaya; J. Ramakrishna

1973-01-01

98

Role of bromine in restoring superconductivity in YBa2Cu3Oy  

Microsoft Academic Search

63,65Cu nuclear quadrupole resonance (NQR), 63,65Cu and 79,81Br nuclear magnetic resonance (NMR), and Br K-edge x-ray-absorption fine-structure (XAFS) measurement techniques have been used to study the local structures of Cu and Br in well-characterized samples of deoxygenated and brominated YBa2Cu3Oy (YBCO). The combined results provide a detailed picture of the role of bromine in reoxygenating the YBCO structure and an

D. M. Potrepka; J. I. Budnick; D. B. Fenner; W. A. Hines; M. Balasubramanian; A. R. Moodenbaugh

1999-01-01

99

35Cl Nuclear Quadrupole Resonance and Thermally Activated Molecular Motion in the 2:1 Crystalline Complex of Antimony Trichloride with Benzene  

Microsoft Academic Search

Nuclear quadrupole resonance (NQR) spectra of chlorine and antimony in the 2SbCl3 · C6H6 complex and their temperature behavior between 77 K and the melting point were studied. The spectral lines of two nonequivalent SbCl3 moieties are compared with available X-ray diffraction data. An analysis of the temperature dependence of the resonant frequency and the spin–lattice relaxation time for 35Cl

V. A. Mokeeva

2002-01-01

100

Funded Studies  

Cancer.gov

Funded Studies  BIQSFP Funded Studies Associated with NCI clinical trials (3/2/15): Type of Study/ FY Approved FY Approved Integral/ Integrated NCTN Group/ NCORP* Study Number Phase Concept Title Cancer Site Biomarker 2014 Integral

101

Complete Topology of the RNF Complex from Vibrio cholerae.  

PubMed

RNF is a redox-driven ion (Na(+) and in one case possibly H(+)) transporter present in many prokaryotes. It has been proposed that RNF performs a variety of reactions in different organisms, delivering low-potential reducing equivalents for specific cellular processes. RNF shares strong homology with the Na(+)-pumping respiratory enzyme Na(+)-NQR, although there are significant differences in subunit and redox cofactor composition. Here we report a topological analysis of the six subunits of RNF from Vibrio cholerae. Although individual subunits from other organisms have previously been studied, this is the first complete, experimentally derived, analysis of RNF from any one source. This has allowed us to identify and confirm key properties of RNF. The putative NADH binding site in RnfC is located on the cytoplasmic side of the membrane. FeS centers in RnfB and RnfC are also located on the cytoplasmic side. However, covalently attached FMNs in RnfD and RnfG are both located in the periplasm. RNF also contains a number of acidic residues that correspond to functionally important groups in Na(+)-NQR. The acidic residues involved in Na(+) uptake and many of those implicated in Na(+) translocation are topologically conserved. The topology of RNF closely matches the topology represented in the newly published structure of Na(+)-NQR, consistent with the close relation between the two enzymes. The topology of RNF is discussed in the context of the current structural model of Na(+)-NQR, and the proposed functionality of the RNF complex itself. PMID:25831459

Hreha, Teri N; Mezic, Katherine G; Herce, Henry D; Duffy, Ellen B; Bourges, Anais; Pryshchep, Sergey; Juarez, Oscar; Barquera, Blanca

2015-04-21

102

[Seroepidemiologic studies].  

PubMed

Serological studies allow us to study diseases distribution by an indirect way, trough serological detection of infection and immunity markers. These studies are applied in public health research, in studies to infections, to evaluate control and immunization programs and to evaluate historical background when a new microorganism is found. In the vaccines field, epidemiological studies present two main objectives: The study of the epidemiology of the infection and the study of the protective immunity in vaccinable or immuno preventable diseases, and planning and evaluation of vaccine programs. For the good quality of epidemiological studies is important to use serum samples which are representative of the total population under study, and to take into account that the serological tests used have to show a high sensitivity. PMID:20111809

Cardeñosa Marín, Neus

2009-01-01

103

Nursing Studies Nursing Studies highlights  

E-print Network

Nursing Studies Nursing Studies highlights Autumn 2013 #12;Nursing Studies The University by the validation panel as `leading edge'. Nursing Studies at the University of Edinburgh has enjoyed another consecutive year, the Bachelor of Nursing with Honours programme achieved the top place in the Guardian's UK

Edinburgh, University of

104

Biofeasibility Study.  

ERIC Educational Resources Information Center

Discusses the use of bioremediation as a method for disposing of contaminants by exploiting natural biodegradation processes. The process of conducting a biofeasibility study and a case study are reviewed. (LZ)

Chaparian, Michael

1995-01-01

105

Sleep Studies  

MedlinePLUS

... page from the NHLBI on Twitter. What Are Sleep Studies? Sleep studies are tests that measure how ... Sleep." Rate This Content: Next >> March 29, 2012 Sleep Infographic Sleep Disorders & Insufficient Sleep: Improving Health through ...

106

Religious Studies.  

ERIC Educational Resources Information Center

An essay on the study of religion at the college level and descriptions of nine programs of religious studies are presented. The essay by David C. Smith suggests that while traditional goals continue to be important, especially in church-related colleges, religious studies has expanded to include insights and materials from such disciplines as…

Mohrman, Kathryn, Ed.

1980-01-01

107

College Studying.  

ERIC Educational Resources Information Center

Notes that many students enter postsecondary institutions unprepared to meet the studying demands placed on them. Examines models and taxonomies that have guided researchers as they have investigated studying. Reviews research factors related to studying at the college level: course characteristics, learner characteristics, and learning…

Nist, Sherrie L.; Simpson, Michele

2002-01-01

108

Social Studies.  

ERIC Educational Resources Information Center

The product of a Special Studies Institute, this teacher developed resource guide for the emotionally handicapped (K-6) presents social study concepts and activities relative to education in the urban out-of-doors. Focus is on the study of man (past, present, and future) interacting with his environment. Listed below are activity examples: (1)…

Bieber, Edward

109

Sound Studies Meets Deaf Studies  

E-print Network

Sound studies and Deaf studies may seem at first impression to operate in worlds apart. We argue in this article, however, that similar renderings of hearing, deafness, and seeing as ideal types - and as often essentialized ...

Friedner, Michele Ilana

110

Film Studies 121 Film Studies  

E-print Network

Film Studies · 121 Film Studies ADVISORY COMMITTEE: Lowry (Director, English), Stock (Modern Languages), Stock (Mod- ern Languages), Stoddard (Education), Zuber (English). The minor in Film Studies-is per- haps the predominant way that World cultures represent themselves. Film has become

Lewis, Robert Michael

111

1 Film Studies FILM STUDIES  

E-print Network

1 Film Studies FILM STUDIES Housed in the Columbian College of Arts and Sciences, the Film Studies Program covers classical film aesthetics, surveys the history of world cinema and takes an in-depth look at films from America, France, Germany, Japan, Russia and the Hispanic world. UNDERGRADUATE Minor · Minor

Vertes, Akos

112

Studying Abroad  

NSDL National Science Digital Library

Recently unveiled by UNESCO, this site is designed to serve as a resource for students considering studying abroad at institutions of higher education, university community members, Secretariats of Regional Committees, and other interested parties. At present, much of the site is under construction, but it does offer an electronic version of Study Abroad, UNESCO's massive guide to higher-education study opportunities and scholarships. The guide totals 629 pages and includes 2,659 entries on courses and scholarships in different higher-education academic and professional disciplines in 129 countries. Anyone interested in studying abroad will want to take a look at this guide and monitor the site for future developments.

113

76 FR 62364 - Certain Kitchen Appliance Shelving and Racks From the People's Republic of China: Preliminary...  

Federal Register 2010, 2011, 2012, 2013, 2014

...questionnaires from NKS on March 14, 2011 (``NQR'') and from the GOC and Wireking on March...none of them are located in the PRC. See NQR at 3-5. Therefore, we are limiting our...that it used this program during 2009. See NQR at 12. We preliminarily determine...

2011-10-07

114

Peace Studies.  

ERIC Educational Resources Information Center

Selected college peace studies programs are described, and perspectives on such efforts in higher education are considered in an article by Robert C. Williams, "Sounds of Silence: The Academy and the Nuclear Question." Following the essay, peace studies activities of six colleges are described. At Syracuse University, the Program in Nonviolent…

Brown, Peggy, Ed.

1983-01-01

115

Women's Studies.  

ERIC Educational Resources Information Center

The 16 articles in this journal issue deal with women's studies within the English curriculum. Topics discussed in the articles include (1) the feminist challenge to the male-centered curriculum in higher education; (2) the women's movement and women's studies; (3) connotations of the word "girl"; (4) women in English education; (5) the new…

Davis, James E., Ed.; Davis, Hazel K., Ed.

1981-01-01

116

Russian studies  

NSDL National Science Digital Library

College and Research Library News has posted this new annotated directory to aid students and researchers working in Russian studies. This site casts a wide net over English and Cyrillic sites in Russian studies, offering a sampling of search engines, news media, meta-indexes, online publications, academic research, and subject-specific sites, just to name a few.

117

SISTER STUDY  

EPA Science Inventory

The Sister Study will investigate the role of genetic, environmental, and lifestyle factors on the risk of breast cancer and other diseases in sisters of women with breast cancer. This research study will enroll 50,000 women who live in the United States and who are the cancer-fr...

118

Studying Zooarchaeology  

ERIC Educational Resources Information Center

Children often associate the study of bones with dinosaurs or crime scenes. This unit introduces students to "zooarchaeology," the study of animal remains from archaeological sites. Students in grades 3-5 engage in hands-on activities examining bones, shells, and other "hard parts" of animals. They use their observations as a starting point for…

Moore, Molly; Wolf, Deborah; Butler, Virginia L.

2012-01-01

119

Observational Studies  

NSDL National Science Digital Library

This lesson on observational studies discusses the nature of such studies, the relationships between various data sets, and regression. Graphs illustrate the relationships, and exercises at the end test the user's comprehension and understanding. It is taken from the online textbook for Western Michigan University online introductory stats course.

Abebe, Asheber

120

African Studies  

NSDL National Science Digital Library

The African Studies WWW server contains information on programs and resources at the University of Pennsylvania, in Africa, the U.S. and elsewhere. The web site is supported by the African Studies Center, part of a four-school consortium, including Bryn Mawr, Haverford, and Swarthmore Colleges and the University of Pennsylvania.

121

Stream Studies.  

ERIC Educational Resources Information Center

This manual provides teachers with some knowledge of ecological study methods and techniques used in collecting data when plants and animals are studied in the field. Most activities deal with the interrelatedness of plant and animal life to the structure and characteristics of a stream and pond. Also included in this unit plan designed for the…

Hamilton City Board of Education (Ontario).

122

173Environmental Studies ENVIRONMENTAL STUDIES  

E-print Network

173Environmental Studies ENVIRONMENTAL STUDIES (ENV) CORE fACULTy: ProfESSorS KAhN*, CooPEr, WArrEN ASSoCIATE ProfESSorS DrUMBL, KNAPP ASSISTANT ProfESSorS CASEY, HAMILToN The Program in Environmental world community. The Program in Environmental Studies is not a ma- jor, but rather a series of related

Dresden, Gregory

123

72 American Studies American Studies  

E-print Network

of American Studies and Anthropology), Scholnick, Webster (Mahoney Professor of Art and Art HistoryGovern, Meyer (Class of 1964 Distinguished Associate Professor of American Studies and History) Weiss, Wulf, such as the relations between men and women in the home. Yet, in the midst of these large movements of history, many

Lewis, Robert Michael

124

Lake Study  

NSDL National Science Digital Library

Lake Study for Windows is a two-part simulation designed to involve students with the scientific method. It allows them to collect data, formulate hypotheses, and test the hypotheses with controlled experiments.

125

Environmental Study  

ERIC Educational Resources Information Center

Reports on a study of a pre-cooperative (the Sidi Saad pre-cooperative, Province of Tunis) as an environment in which a functional literacy program, integrated with socioeconomic development, was to be developed. (EB)

Literacy Discussion, 1970

1970-01-01

126

Sister Study  

Cancer.gov

The Sister Study, conducted by the National Institute of Environmental Health Sciences (NIEHS), is prospectively examining environmental and familial risk factors for breast cancer and other outcomes in a cohort of 50,884 sisters of women who have had breast cancer. These sisters have about twice the risk of developing breast cancer due to their family history and are expected to be highly motivated to participate in a long-term study.

127

Cholera studies  

PubMed Central

In this study, the author describes in detail experimental cholera infection of mammals (infection by the oral route, intragastric inoculation, and intestinal, gall-bladder, and parenteral infection). The pathogenicity for lower animals is examined, and certain observations on insects are included. The second part of the study is devoted to the pathology of human cholera (morbid anatomy distribution of the causative organisms in the dead bodies of cholera victims, and pathogenesis). PMID:13284569

Pollitzer, R.

1955-01-01

128

Coexistence of Antiferromagnetism with Superconductivity in CePt2In7: Microscopic Phase Diagram Determined by In115 NMR and NQR  

NASA Astrophysics Data System (ADS)

Single crystals of the heavy-fermion antiferromagnet CePt2In7 with a Néel temperature (TN) of 5.2 K at ambient pressure have been investigated by zero-field In115-nuclear magnetic and quadrupole resonance measurements as a function of applied pressure. Within the antiferromagnetic state, the character of Ce's 4f electron appears to change from localized to itinerantlike at P*˜2.4 GPa, approximately the pressure where superconductivity first emerges. With increased pressure, the superconducting transition Tc reaches a maximum just at or slightly before antiferromagnetic order disappears, and not at the pressure Pc˜3.4 GPa, where the steeply decreasing Néel boundary extrapolates to zero temperature. For P >Pc, the spin relaxation rate drops sharply by more than 2 orders of magnitude at Tc, suggestive of a first-order transition.

Sakai, H.; Tokunaga, Y.; Kambe, S.; Ronning, F.; Bauer, E. D.; Thompson, J. D.

2014-05-01

129

Research Study  

ERIC Educational Resources Information Center

Background: Action Research about my 2nd grade classroom in the Buffalo School District. I examined three areas of interest and tried to find some conclusions related to behavior management. Purpose: The purpose of this study is how will implementing procedures, rules, and consequences help improve student behavior. Research Design: Descriptive;…

Glick, Ashley

2010-01-01

130

Cholera studies  

PubMed Central

Relevant information regarding the numerous problems encountered in cholera immunity is dealt with in great detail in this study. Toxin production, bacterial virulence, serological reactions, and the antigenic structure of V. cholerae are discussed. Natural, passive, and active cholera immunity receives special attention, the authors describing the various means of vaccination as well as the evaluation of the immunity induced. PMID:13240451

Pollitzer, R.; Burrows, W.

1955-01-01

131

Cholera studies  

PubMed Central

In this, the first of a series of cholera studies, the history of the disease from its earliest recorded appearance up to 1923 is outlined, and its geographical distribution described. The origins and main routes of spread of the six great pandemics are indicated; possible causes of the variations in mortality which accompanied them are discussed. PMID:13160764

Pollitzer, R.

1954-01-01

132

Study Skills.  

ERIC Educational Resources Information Center

Study strategies used to assist mildly handicapped students become more actively engaged and successful in gaining and responding to information in content area classes are described. They include using advance organizers, summarizing/paraphrasing what is read, enhancing listening skills, and improving the organization, appearance, and accuracy of…

Gleason, Mary M.; And Others

1988-01-01

133

Cholera studies  

PubMed Central

The morphological characteristics, biochemical properties, and cultural characteristics of V. cholerae are described in great detail in this study. The author also discusses the resistance of the organism to temperature, humidity, sunlight, and various chemicals, as well as the viability of V. cholerae outside the body (in faeces, contaminated material, food, beverages, water, etc.). PMID:14379012

Pollitzer, R.

1955-01-01

134

CASE STUDY  

E-print Network

Abstract: The present study indicate that the copper mineralization in the area is of the nature of scattered sporadic occurrences of narrow lenticular and impersistent stringers and veins of copper-ore in vein-quartz and pegmatite traversing the amphibolite and garnetiferous mica schist country

D. B. Sankar; K. S. Sai Prasad

135

OPEN Study  

Cancer.gov

Over the course of the study, OPEN participants completed 2 Food Frequency Questionnaires (FFQ), 2 24-recall interviews, and filled out several other health-related questionnaires. They were dosed with doubly labeled water (a biomarker used for measuring energy expenditure), provided several spot urine samples to complete the doubly labeled water assessment, completed two 24-hour urine collections and had their height and weight measured.

136

Cholera studies*  

PubMed Central

The first portion of this study describes in detail the different aspects of stool examinations, including the collection, preservation, and pooling of specimens, macroscopic and bacterioscopic examination, enrichment methods, and cultivation on a variety of solid media. The author also deals with the examination of vomits and of water. The performance and value of different identification tests (agglutination, haemolysis, and bacteriophage) and confirmatory tests are then considered. An annex is included on bacteriological procedures in the laboratory diagnosis of cholera. PMID:13356145

Pollitzer, R.

1956-01-01

137

Animal Studies  

Microsoft Academic Search

\\u000a Because of the potential danger of ventricular fibrillation (VF), numerous TASER conducted electrical weapon (CEW) studies\\u000a have been performed on animals. Holden et al. [1] injected M26 and X26 TASER waveforms to an electrode on the ventricular\\u000a epicardial surface of guinea pig isolated hearts, but were unable to induce VF. However, it is known that inducing sustained\\u000a VF in very

John G. Webster

138

1 American Studies AMERICAN STUDIES  

E-print Network

of the United States in the world. The department is committed to analytical perspectives that integrate a range of disciplinary approaches, including history, literary/cultural studies, political and cultural theory, political questions of race, gender, sexuality, and other forms of power in American life; transnational flows

Vertes, Akos

139

Drama studies Why drama studies?  

E-print Network

as a creative practitioner and thinker. · Specialist teaching from active practitioners and researchers in specific historical periods, as well as in international contemporary theatre practices and performance workshops and with professional visiting artists and practitioners. · Programme of study that moves from

Sussex, University of

140

STUDY ABROADFOR INTERNATIONAL RELATIONS & GLOBAL STUDIES MAJORS STUDY ABROAD  

E-print Network

STUDY ABROADFOR INTERNATIONAL RELATIONS & GLOBAL STUDIES MAJORS STUDY ABROAD #12;WHY YOU SHOULD STUDY ABROAD 2 STUDY ABROAD FOR INTERNATIONAL RELATIONS & GLOBAL STUDIES MAJORS Study abroad programs Consider the real cost of studying abroad: the difference between a semester in Austin and a semester

John, Lizy Kurian

141

Study Finance  

NSDL National Science Digital Library

Created and maintained by the University of Arizona, this site is designed to assist beginning finance students by offering very basic information about the study of finance. Be sure to look at the online lectures, which include RealAudio files as well as accompanying handouts and tables. Also on-site are well-written, basic overviews of topics including ratio analysis, time valuation of money, and capitol budgeting. In addition, the site contains several helpful links to outside resources about market information, careers, and publications.

142

Cholera studies*  

PubMed Central

Discussing the symptomatology of cholera, the author deals first with the incubation period, the clinical types, choleraic diarrhoea, and cholerine; he then considers in detail the various stages of cholera gravis and the relapses and complications that may be met. This is followed by sections on diagnosis and differential diagnosis, and on prognosis and the various factors influencing it. The author's highly detailed review of the treatment of cholera which concludes this study is divided into three parts, dealing with attempts at specific therapy, with infusion treatment, and with adjuvant treatment. PMID:13426761

Pollitzer, R.

1957-01-01

143

Cholera studies*  

PubMed Central

In this study, figures relating to cholera deaths occurring in individual countries, from 1900 to 1952, are recorded as well as the incidence of the disease from 1923 up to the present time. The mode of spread of cholera from its endemic home in India to outside countries is described in relation to favourable seasons, main routes followed by the infection, and the role played by large religious gatherings. The incidence of the disease in the various seaports infected within recent years is discussed. PMID:14364186

Swaroop, S.; Pollitzer, R.

1955-01-01

144

Quaternary Studies  

NSDL National Science Digital Library

First, the Irish Quaternary Association (IQUA) website publicizes its aim "to promote Quaternary studies in Ireland through its publications, and the organization of field meetings and conferences" (1). Visitors can learn about the importance of quaternary studies as well as find out the latest news and upcoming meetings. At the second website, the University of Wisconsin-Madison describes the current and recent studies dealing with "basic and applied problems in glacial geology, surficial geology, palynology, sedimentology, geologic mapping, hydrogeology, soils, and environmental geology "(2). The website offers abstracts of publications of members of the Department of Geology and Geophysics and the Wisconsin Geological and Natural History Survey along with descriptions of the lab, a shaded relief map of the Wisconsin area, and amusing glacial songs. Next, the Godwin Institute of Quaternary Research (GIQR) presents the University of Cambridge's history in quaternary research and the seven current research groups and four recent research projects (3 ). The website furnishes news from the research groups, a gallery of historical images of the East Anglia excursion, and summaries of the Institute's reference collections. Fourth, the International Union for Quaternary Research (INQUA) discusses quaternary scientists' investigations "to interpret the changing world of the glacial ages and their impact on our planet's surface environments" (4). Researchers can find out about INQUA-funded projects, meetings, and scientific commissions. Next, the Quaternary Research Association explains that it "exists to promote understanding of the Quaternary Period by publishing field guides, technical guides, and an international journal as well as holding field meetings and speaker meetings" (5). Students and researchers can discover employment, research, grant, meetings, and educational opportunities. Sixth, the University of Wales presents its investigations in the Remote Sensing Laboratory, Palaeoecology Laboratory, and the Luminescence Laboratory (6 ). Users can find concise descriptions of individual researchers' successes, abstracts of published papers, and links to conference information. The seventh website illustrates the Alaska Quaternary Center's commitment "to the promotion of interdisciplinary research and the enhancement of interdisciplinary instruction in Quaternary sciences" (7). Users can view images of the field work and learn how to obtain quaternary data from the Geographic Information Network of Alaska (GINA). Lastly, Rutgers University promotes its Graduate Certificate in Quaternary Studies where students take part in geology, geography, meteorology, and other disciplines interested in the last couple of million years of Earth's history (8). Students and educators can find information on the researchers involved with the program and the necessary course work.

145

Plague studies*  

PubMed Central

In examining the control and prevention of plague, the author pays particular attention to the control of commensal rodents and their fleas. The various rat poisons in current use, their efficacy and practical application, and the dangers involved in their manipulation are described in great detail. The author also discusses other anti-rodent measures such as fumigation, rat-proofing, sanitation, protection of food, etc. The second part of the study deals with: vector control—the outstanding value of DDT application in rodent-flea control is emphasized—, the direct control of bubonic and pneumonic plague, and the control of the spread of plague at a distance. PMID:20603968

Pollitzer, R.

1953-01-01

146

Anticorrosion studies  

NASA Technical Reports Server (NTRS)

The aging behavior of chemically bonded interfaces between metals and pottants, such as ethylene vinyl acetate (EVA) was studied using the Dow Corning primer systems. It was observed that the primers seem to function as anticorrosive agents on metal surfaces. It was demonstrated that EVA, and the A-11861 EVA/glass primer stops corrosion of the aluminum used on the back surfaces of crystalline silicon solar cells. However, this same treatment does not work for the aluminum on the back surfaces of amorphous silicon solar cells.

Boerio, J.

1986-01-01

147

Conceptual study  

SciTech Connect

This appendix is a compendium of topical reports prepared for the Hanford Nuclear Energy Center: Status Report: Conceptual Fuel Cycle Studies for the Hanford Nuclear Energy Center; Selection of Heat Disposal Methods for a Hanford Nuclear Energy Center; Station Service Power Supply for a Hanford Nuclear Energy Center (HNEC); Impact of a Hanford Nuclear Energy Center on Ground Level Fog and Humidity; A Review of Potential Technology for the Seismic Characterization of Nuclear Energy Centers; Reliability of Generation at a Hanford Nuclear Energy Center (HNEC); Meteorological Evaluation of Multiple Reactor Contamination Probabilities for a Hanford Nuclear Energy Center; Electric Power Transmission for a Hanford Nuclear Energy Center (HNEC); The Impact of a Hanford Nuclear Energy Center on Cloudiness and Insolation; and A Licensing Review for an HNEC.

Harty, H.

1978-09-01

148

Cholera studies*  

PubMed Central

In discussing prevention, the author deals first with the provision of permanently safe water, supplied from waterworks or wells, and with other improvements in environmental sanitation. Control of food and drinks, public health propaganda and education, and vaccination are also considered under this heading. The greater part of this study is devoted to suppressive measures, affecting the individual, the environment, and persons in the mass. Discussion of the isolation, detection and management of cholera patients, the management of contacts, and the management and treatment of carriers is followed by sections on, inter alia, disinfection, temporary improvements in water supplies, fly control, and personal prophylaxis. In dealing with mass prophylaxis, the author pays particular attention to vaccination. In the concluding sections he goes into the control of pilgrimages and local and international quarantine measures. PMID:13479774

Pollitzer, R.

1957-01-01

149

Plague studies*  

PubMed Central

Epidemiological aspects of (a) bubonic plague and (b) primary pneumonic plague are discussed separately in this study. The cause, spread, and persistence of bubonic outbreaks are dealt with. In the case of primary pneumonic plague, the author systematically reviews the factors influencing the spread of the disease: climatic and social conditions, infectivity of the patients, immunity, and control measures. In discussing the cause of pneumonic plague outbreaks, the author deals with the possible influence of a special virulence of pneumonic strains, the role of the rodent and flea species involved, and the possibility of a pneumotropismus acquired by Pasteurella pestis. The periodicity (cyclical and secular) of bubonic plague epidemics is discussed with a view to the possible forecasting of future epidemics. The author indicates the influence of race, age, sex, and occupation on the incidence of both forms of the disease. PMID:13082391

Pollitzer, R.

1953-01-01

150

Studying toxicity  

USGS Publications Warehouse

With funding from the George Mitchell Center for the Environment at the University of Maine, a team of scientists used a simple laboratory-based sediment resuspension design, and two well-established aquatic toxicology models, fathead minnows (Pimephales promelas) and zebrafish (Danio rerio), to evaluate if resuspension of Penobscot river sediment significantly elevates the toxicity of river water and to provide preliminary information on the types of chemicals likely to desorb during resuspension. The group collected sediments from two sites with known chemical contamination downstream of the Great Works and Veazie dams. The sediments were examined to determine the dynamics of PAH desorption and degradation under different resuspension frequencies. The scientists used clarified water from resuspension experiments for toxicity tests with the water-flea Ceriodaphnia dubia, and other aquatic test organisms to infer toxicity from sediments from northern California rivers. Data from the study will help ascertain whether metals and/or xenoestrogens are present in the desorption water and give insight into possible avenues of sediment remediation.

Elkus, A.; LeBlanc, L.; Kim, C.; Van Beneden, R.; Mayer, G.

2006-01-01

151

study abroad STUDY ABROADFOR PSYCHOLOGY MAJORS  

E-print Network

study abroad STUDY ABROADFOR PSYCHOLOGY MAJORS #12;WHY YOU SHOULD STUDY ABROAD 2 STUDY ABROAD for complex challenges professionals face in the field of Psychology. Study abroad students may explore is provided within this brochure. AFFORDABILITY Consider the real cost of studying abroad: the difference

John, Lizy Kurian

152

STUDY ABROADFOR PHYSICS MAJORS study abroad  

E-print Network

STUDY ABROADFOR PHYSICS MAJORS study abroad #12;WHY YOU SHOULD STUDY ABROAD 2 STUDY ABROAD FOR PhYSicS MAJORS Study abroad programs provide Physics majors with access to interesting and relevant courses or an internship during your stay abroad. PRE-HEALTH PROFESSIONS OPTIONS Explore the "Study Abroad Guide for Pre

Johnston, Daniel

153

STUDY ABROADFOR BIOLOGY MAJORS study abroad  

E-print Network

STUDY ABROADFOR BIOLOGY MAJORS study abroad #12;WHY YOU SHOULD STUDY ABROAD 2 STUDY ABROAD FOR BIOLOGY MAJORS Study abroad programs provide Biology majors with access to science courses around or internships during your stay abroad. PRE-HEALTH PROFESSIONS OPTIONS Explore the "Study Abroad Guide for Pre

Pillow, Jonathan

154

Is the pseudogap a topological state?  

NASA Astrophysics Data System (ADS)

We conjecture that the pseudogap is an inhomogeneous condensate above the homogeneous state whose existence is granted by topological stability. We consider the simplest possible order parameter theory that provides this interpretation of the pseudogap and study its angular momentum states. Also we obtain a solution of the Bogomol'nyi self-duality equations and find skyrmions. The normal state gap density, the breaking of the time reversal symmetry and the checkerboard pattern are naturally explained under this view. The pseudogap is a lattice of skyrmions and the inner weak local magnetic field falls below the experimental threshold of observation given by NMR/NQR and ?SR experiments.

Vargas-Paredes, Alfredo A.; Cariglia, Marco; Doria, Mauro M.

2015-02-01

155

Study tips / Study skills and resources Study skills and resources  

E-print Network

Study tips / Study skills and resources Study skills and resources Study tips Developing effective really need to take a lot of notes then do so, but re-read them the next day and write down exactly how approach ­ rehearse and test your arguments as fully as possible before you start the first draft

Bristol, University of

156

STUDY ABROADFOR NUTRITION MAJORS study abroad  

E-print Network

STUDY ABROADFOR NUTRITION MAJORS study abroad #12;WHY YOU SHOULD STUDY ABROAD 2 STUDY ABROAD FOR NUTRITION MAJORS Study abroad programs provide Nutrition majors with access to interesting and relevant. It is possible for Nutrition students to go abroad for a semester and still graduate on time! WHAT YOU NEED

John, Lizy Kurian

157

Light-induced transcriptional responses associated with proteorhodopsin-enhanced growth in a marine flavobacterium.  

PubMed

Proteorhodopsin (PR) is a photoprotein that functions as a light-driven proton pump in diverse marine Bacteria and Archaea. Recent studies have suggested that PR may enhance both growth rate and yield in some flavobacteria when grown under nutrient-limiting conditions in the light. The direct involvement of PR, and the metabolic details enabling light-stimulated growth, however, remain uncertain. Here, we surveyed transcriptional and growth responses of a PR-containing marine flavobacterium during carbon-limited growth in the light and the dark. As previously reported (Gómez-Consarnau et al., 2007), Dokdonia strain MED134 exhibited light-enhanced growth rates and cell yields under low carbon growth conditions. Inhibition of retinal biosynthesis abolished the light-stimulated growth response, supporting a direct role for retinal-bound PR in light-enhanced growth. Among protein-coding transcripts, both PR and retinal biosynthetic enzymes showed significant upregulation in the light. Other light-associated proteins, including bacterial cryptochrome and DNA photolyase, were also expressed at significantly higher levels in the light. Membrane transporters for Na(+)/phosphate and Na(+)/alanine symporters, and the Na(+)-translocating NADH-quinone oxidoreductase (NQR) linked electron transport chain, were also significantly upregulated in the light. Culture experiments using a specific inhibitor of Na(+)-translocating NQR indicated that sodium pumping via NQR is a critical metabolic process in the light-stimulated growth of MED134. In total, the results suggested the importance of both the PR-enabled, light-driven proton gradient, as well as the generation of a Na(+) ion gradient, as essential components for light-enhanced growth in these flavobacteria. PMID:21472017

Kimura, Hiroyuki; Young, Curtis R; Martinez, Asuncion; Delong, Edward F

2011-10-01

158

AGRICULTURAL HEALTH STUDY/PESTICIDE EXPOSURE STUDY  

EPA Science Inventory

The Agricultural Health Study (AHS) is a prospective epidemiologic study of a large cohort of pesticide applicators and their spouses in Iowa and North Carolina. The Pesticide Exposure Study is a sub-study to evaluate exposure factors and to provide data to assess exposure cla...

159

Extension Specialist Case Studies Case Study 1  

E-print Network

Extension Specialist Case Studies Case Study 1: A horticulture extension specialist is located. Case Study 2: A small grains extension specialist is located on campus at OSU. He is housed which way to vote on this case? file: P&T case studies.doc #12;

Tullos, Desiree

160

CASE STUDY CRITIQUE; UPPER CLINCH CASE STUDY  

EPA Science Inventory

Case study critique: Upper Clinch case study (from Research on Methods for Integrating Ecological Economics and Ecological Risk Assessment: A Trade-off Weighted Index Approach to Integrating Economics and Ecological Risk Assessment). This critique answers the questions: 1) does ...

161

270 / Near Eastern Studies Near Eastern Studies  

E-print Network

Eastern antiquities, including excellent study col- lections of Egyptian artifacts and Palestinian pot liberal arts education, as well as a basis for graduate study. An undergradu- ate major can specialize

Niebur, Ernst

162

Study Abroad & Exchange Students  

E-print Network

Study Abroad & Exchange Students Essential Guide 2011 #12;Study Abroad Office, The University of Western Australia CRICOS Provider Code: 00126G Page 2 CONTENTS THE STUDY ABROAD OFFICE ...................................................................................................................... 3 Study Abroad Office Staff

Petriu, Emil M.

163

Paraguayan Education Study: A Pilot Study.  

ERIC Educational Resources Information Center

A qualitative pilot study, guided by an ecological framework, illustrates the complexities involved in studying the unique linguistic situation in Paraguay between Spanish and the indigenous language of Guarani, and its relationship with education. The pilot study interviewing eight kindergarten children. Seventy five children have been…

Garcia, Patricia

164

Study Guide for TCT in Social Studies.  

ERIC Educational Resources Information Center

This study guide is designed for individuals who are preparing to take the Georgia Teacher Certification Test (TCT) in social studies. The subareas of the test are: (1) historical development, behavioral science; (2) Georgia studies; (3) economics; (4) geography; (5) history; (6) American government; and (7) citizenship. This guide lists content…

Hutcheson, Gwen N.; Lazaroff, Edward J., Ed.

165

Image restoration using fast Fourier and wavelet transforms  

NASA Astrophysics Data System (ADS)

Pure nuclear quadrupole resonance (NQR) of 14N nuclei is quite promising as a method for detecting explosives such as RDX and contraband narcotics such as cocaine and heroin in quantities of interest. Pure NQR is conducted without an external applied magnetic field, so potential concerns about damage to magnetically encoded data or exposure of personnel to large magnetic fields are not relevant. Because NQR frequencies of different compounds are quite distinct, we do not encounter false alarms from the NQR signals of other benign materials. We have constructed a proof-of-concept NQR explosives detector which interrogates a volume of 300 liters (10 ft3). With minimal modification to the existing explosives detector, we can detect operationally relevant quantities of (free base) cocaine within the 300-liter inspection volume in 6 seconds. We are presently extending this approach to the detection of heroin base and also examining 14N and 35,37Cl pure NQR for detection of the hydrochloride forms of both materials. An adaptation of this NQR approach may be suitable for scanning personnel for externally carried contraband and explosives. We first outline the basics of the NQR approach, highlighting strengths and weaknesses, and then present representative results for RDX and cocaine detection. We also present a partial compendium of relevant NQR parameters measured for some materials of interest.

Harrod, William J.; Nagy, James G.; Plemmons, Robert J.

1994-02-01

166

Narcotics and explosives detection by 14N pure nuclear quadrupole resonance  

NASA Astrophysics Data System (ADS)

Pure nuclear quadrupole resonance (NQR) of 14N nuclei is quite promising as a method for detecting explosives such as RDX and contraband narcotics such as cocaine and heroin in quantities of interest. Pure NQR is conducted without an external applied magnetic field, so potential concerns about damage to magnetically encoded data or exposure of personnel to large magnetic fields are not relevant. Because NQR frequencies of different compounds are quite distinct, we do not encounter false alarms from the NQR signals of other benign materials. We have constructed a proof-of-concept NQR explosives detector which interrogates a volume of 300 liters (10 ft3). With minimal modification to the existing explosives detector, we can detect operationally relevant quantities of (free base) cocaine within the 300-liter inspection volume in 6 seconds. We are presently extending this approach to the detection of heroin base and also examining 14N and 35,37Cl pure NQR for detection of the hydrochloride forms of both materials. An adaptation of this NQR approach may be suitable for scanning personnel for externally carried contraband and explosives. We first outline the basics of the NQR approach, highlighting strengths and weaknesses, and then present representative results for RDX and cocaine detection. We also present a partial compendium of relevant NQR parameters measured for some materials of interest.

Garroway, Allen N.; Buess, Michael L.; Yesinowski, James P.; Miller, Joel B.

1994-03-01

167

Administration Study Abroad  

E-print Network

Administration Study Abroad International Student and Scholars Services Special Programs Academic, International Recruitment Representative Heather Dolan, Study Abroad and Outreach Assistant Kevin Brustuen Alyson Roberts, CCIS Coordinator Susan Welker, Study Abroad Manager Jean Aspevig, Accountant Dr. Norman

Maxwell, Bruce D.

168

ATBC Study - Contact Us  

Cancer.gov

Skip to Main Content Home Contact Us Links Study Details Questionnaires & Forms Current Projects ATBC Study Bibliography Study Investigators & Collaborators Proposal Review & Collaboration Research Consortium Projects Contact Us If you are seeking general

169

Shanghai Women's Health Study  

Cancer.gov

The Shanghai Women's Health Study, a collaborative study by NCI, Vanderbilt University, and the Shanghai Cancer Institute, is a prospective cohort study of approximately 75,000 women, which aims to evaluate the causes of cancer among Chinese women.

170

Studies That Observe Humans  

MedlinePLUS

... may also be called a follow-up or longitudinal study.) A cohort study usually observes groups and compares ... factors affect their outcomes. Cohort studies can be prospective , meaning that the researchers select a group and ...

171

Labour Studies Labour Studies is about revealing  

E-print Network

will study a range of social issues, including poverty, unemployment, gender discrimination, human rights. Labour Studies explores the problems, limitations and challenges of workplaces, and ultimately, tries requires students to design, conduct and apply a research project to a real community or workplace issue

172

Generalizing from Case studies: A Case Study  

Microsoft Academic Search

Most empirical evaluations of machine learningalgorithms are case studies -- evaluationsof multiple algorithms on multiple databases.Authors of case studies implicitly or explicitlyhypothesize that the pattern of theirresults, which often suggests that one algorithmperforms significantly better thanothers, is not limited to the small numberof databases investigated, but instead holdsfor some general class of learning problems.However, these hypotheses are rarely supportedwith...

David W. Aha

1992-01-01

173

Internet Monitoring Study Internet Monitoring Study  

E-print Network

Parents' Internet Monitoring Study Parents' Internet Monitoring Study Prepared for Cox criteria: ­ Have a child between the ages of 13-17 ­ Have at least one computer in the home with Internet · The family room (34%) and the bedroom (30%) are the top two areas where teens access the Internet. ­ 41

174

Coulomb disorder effects on angle-resolved photoemission and nuclear quadrupole resonance spectra in cuprates  

NASA Astrophysics Data System (ADS)

The role of Coulomb disorder, either of extrinsic origin or introduced by dopant ions in undoped and lightly doped cuprates, is studied. We demonstrate that charged surface defects in an insulator lead to a Gaussian broadening of the angle-resolved photoemisson spectroscopy (ARPES) lines. The effect is due to the long-range nature of the Coulomb interaction. A tiny surface concentration of defects about a fraction of one percent is sufficient to explain the line broadening observed in Sr2CuO2Cl2 , La2CuO4 , and Ca2CuO2Cl2 . Due to the Coulomb screening, the ARPES spectra evolve dramatically with doping, changing their shape from a broad Gaussian form to narrow Lorentzian ones. To understand the screening mechanism and the line-shape evolution in detail, we perform Hartree-Fock simulations with random positions of surface defects and dopant ions. To check validity of the model we calculate the nuclear quadrupole resonance (NQR) line shapes as a function of doping and reproduce the experimentally observed NQR spectra. Our study also indicates opening of a substantial Coulomb gap at the chemical potential. For a surface CuO2 layer the value of the gap is on the order of 10 meV while in the bulk it is reduced to the value about a few meV.

Chen, Wei; Khaliullin, Giniyat; Sushkov, Oleg P.

2009-09-01

175

mathematical Study program cycle  

E-print Network

127 mathematical statistics Master's study programms #12;128 #12;· Study program cycle: Second cycle study program without subprograms or modules. · Anticipated academic title: Master in Mathematical · Basic goals: The principal goal of the study program in Mathematical Statistics is to create highly

?umer, Slobodan

176

study programs in mathematics  

E-print Network

study programs in m mathematics #12;#12;3 CONTENTS 5 Introduction 7 Mathematics at the University of Ljubljana 9 Department of Mathematics information page Academic study program in Mathematics Academic study program in Financial Mathematics Single cycle master's study program in Mathematics education

Â?umer, Slobodan

177

Study Abroad in Architecture  

E-print Network

Study Abroad in Architecture Studying abroad is increasingly important for architecture majors when you enter the job market. Why should I go abroad? Studying abroad is an opportunity to not only studies and career. Some of the potential benefits of going abroad include: Gain an international

Heller, Barbara

178

STUDY ABROAD SCHOLARSHIPS  

E-print Network

FALL 2011 STUDY ABROAD SCHOLARSHIPS The UIC Honors College offers two scholarships for students Abroad Scholarship. FLAHERTY SCHOLARSHIP Flaherty Scholarships for study abroad are made possible for one study abroad experience. DEAN'S SCHOLARSHIP FOR STUDY ABROAD The UIC Honors College offers Dean

Illinois at Chicago, University of

179

Study Abroad in Psychology  

E-print Network

Study Abroad in Psychology Studying abroad is increasingly important for psychology majors of global issues gained are critical to the companies' success. Why should I go abroad? Studying abroad that will significantly enhance your studies and career. Some of the potential benefits of going abroad include: Gain

Heller, Barbara

180

Study Abroad in Humanities  

E-print Network

Study Abroad in Humanities Studying abroad is increasingly important for social science majors gained are critical to the companies' success. Why should I go abroad? Studying abroad is an opportunity your studies and career. Some of the potential benefits of going abroad include: Experience another

Heller, Barbara

181

Mathematics and Study Abroad  

E-print Network

Mathematics and Study Abroad Mathematics Imagine studying abstract algebra in the United Kingdom or complex analy- sis in Australia. There are many first- rate study abroad programs where you can get your own. Study abroad is one very ex- citing way to discover new approaches and build your

182

OFFICESOFFICES GROUP STUDY  

E-print Network

, PUBLIC PRINTER PUBLIC COMPUTERS & SCANNER STUDY SPACE STUDY SPACE 5 REFERENCE BRO W SERY NEWBOOKS STUDY SOUTH GROUP STUDY SPACES MEDIA ROOM MICROFICHE/ MICROFILM ATHENA COMPUTERS & ADA STATION SCANNER, COPIER SPACE 6 SOUTH EAST WEST NORTH Q335-QA76.7 ATHENA COMPUTERS A-Q335 THESES TA1-TA499 QA805-TA1 QA76.7-QA

183

Summer Studies CALENDAR 2010  

E-print Network

Summer Studies UNIVERSITY CALENDAR 2010 #12;McGill University, 2010 Summer Studies 1 ABOUT About This Calendar Published by: McGill Summer Studies McGill University 688 Sherbrooke Street West, Suite 1029, and changes can be made after this Calendar is published. Please check the Summer Studies website at www

Fabry, Frederic

184

Advanced planetary studies  

NASA Technical Reports Server (NTRS)

Eleven study tasks are described and key results are discussed for the following: advanced planning activity; cost estimation research; planetary missions performance handbooks-revisions; multiple discipline science assessment; asteroid workshop; galilean lander mission strategies; asteroid exploration study; ion drive transport capabilities; Mars strategy study; Venus surface sample return; and ion drive/solar sail assessment study.

1978-01-01

185

Effectiveness of Home Study.  

ERIC Educational Resources Information Center

Home study has enjoyed a slow but steady growth in popularity and acceptance. The growth of independent home study may be attributed to both the realities of the present educational environment and the consistently positive results of the home study method. At least one researcher has suggested that the initially slow growth of home study may have…

Diehl, Grover E.; And Others

186

Business and management studies  

E-print Network

Business and management studies Essentials What business and management studies courses are there? Accounting and Finance Accounting and Finance (with a professional placement year) Business and Management Studies Business and Management Studies (with a professional placement year) Business with Human Resource

Sussex, University of

187

Film Studies Degree options  

E-print Network

102 Film Studies Degree options MA (Joint Honours Degrees) Film Studies and one of: Ancient History Anthropology SpanishW Theological Studies FilmStudieswww.st-andrews.ac.uk/filmstudies Features * The Department of Film Studies consistently receives excellent ratings of student satisfaction in course evaluations

Brierley, Andrew

188

258 / Near Eastern Studies Near Eastern Studies  

E-print Network

- lections of Egyptian artifacts and Palestinian pot- tery. The Baltimore-Washington area is especially rich be the focal point of a broad liberal arts education, as well as a basis for graduate study. An undergradu- ate

Niebur, Ernst

189

The National Children's Study  

NSDL National Science Digital Library

The National Children's Study is an ongoing study by the National Institute of Child Health and Human Development, the National Institute of Environmental Health Sciences, the Centers for Disease Control and Prevention, and the US Environmental Protection Agency. This new Web siteprovides comprehensive information about the study, including background, an overview of the study, information from previous meetings, and a list of people involved in coordinating and conducting the study.

190

Role of bromine in restoring superconductivity in YBa2Cu3Oy  

NASA Astrophysics Data System (ADS)

63,65Cu nuclear quadrupole resonance (NQR), 63,65Cu and 79,81Br nuclear magnetic resonance (NMR), and Br K-edge x-ray-absorption fine-structure (XAFS) measurement techniques have been used to study the local structures of Cu and Br in well-characterized samples of deoxygenated and brominated YBa2Cu3Oy (YBCO). The combined results provide a detailed picture of the role of bromine in reoxygenating the YBCO structure and an explanation for the partial restoration of superconductivity in the YBCO system. Characterization of the powder samples, with particle sizes of 1, 20, 30, and 40 ?m, included x-ray diffraction, thermal gravimetric analysis, energy dispersive x-ray analysis, and magnetometry. From the XAFS and NMR results, it is concluded that, upon bromination at 260 °C, Br does not enter the YBCO lattice either substitutionally or interstitially. Instead, there is compelling evidence for the formation of nanoscale BaBr2 precipitates which result from the local destruction of the YBa2Cu3Oy phase. Furthermore, on the basis of the NQR and NMR experiments, it is concluded that through this decomposition into an inhomogeneous material, oxygen is liberated which repopulates the nearby O(4) chain sites, thus restoring superconductivity.

Potrepka, D. M.; Budnick, J. I.; Fenner, D. B.; Hines, W. A.; Balasubramanian, M.; Moodenbaugh, A. R.

1999-10-01

191

Effect of a weak static magnetic field on nitrogen-14 quadrupole resonance in the case of an axially symmetric electric field gradient tensor.  

PubMed

The application of a weak static B0 magnetic field (less than 1 mT) may produce a well-defined splitting of the (14)N Quadrupole Resonance line when the electric field gradient tensor at the nitrogen nucleus level is of axial symmetry. It is theoretically shown and experimentally confirmed that the actual splitting (when it exists) as well as the line-shape and the signal intensity depends on three factors: (i) the amplitude of B0, (ii) the amplitude and pulse duration of the radio-frequency field, B1, used for detecting the NQR signal, and (iii) the relative orientation of B0 and B1. For instance, when B0 is parallel to B1 and regardless of the B0 value, the signal intensity is three times larger than when B0 is perpendicular to B1. This point is of some importance in practice since NQR measurements are almost always performed in the earth field. Moreover, in the course of this study, it has been recognized that important pieces of information regarding line-shape are contained in data points at the beginning of the free induction decay (fid) which, in practice, are eliminated for avoiding spurious signals due to probe ringing. It has been found that these data points can generally be retrieved by linear prediction (LP) procedures. As a further LP benefit, the signal intensity loss (by about a factor of three) is regained. PMID:24183810

Guendouz, Laouès; Aissani, Sarra; Marêché, Jean-François; Retournard, Alain; Marande, Pierre-Louis; Canet, Daniel

2013-01-01

192

Communication Studies, Cultural Studies, and Media Studies Infobase  

NSDL National Science Digital Library

Mick Underwood's extensive infobase of communication, culture, and media studies introduces various models and theories of communication and explains their social and cultural implications. In addition, the infobase includes a detailed index of terms, a bibliography of references, a list of links, a message forum, a chat room, and a series of online quizzes. The great volume of information at this site is effectively managed via several navigation tools: a site map, an index, pull-down menus, and meaningful icons.

193

Electrodynamic tether system study: Extended study  

NASA Technical Reports Server (NTRS)

This document is the final report of a study performed by Ball Space Systems Division (BSSD) for the NASA Johnson Space Center under an extension to contract NAS9-17666. The tasks for the extended study were as follows: (1) Define an interface between the Electrodynamic Tether System (ETS) and the Space Station (SS); (2) Identify growth paths for the 100 kW ETS defined in the original study to a 200 kW level of performance; (3) Quantify orbit perturbations caused by cyclic day/night operations of a Plasma Motor/Generator (PMG) on the SS and explore methods of minimizing these effects; (4) Define the analyses, precursor technology, ground tests, and precursor demonstrations leading up to a demonstration mission for an electrodynamic tether system that would be capable of producing maneuvering thrust levels of 25 newtons; and (5) Propose a development schedule for the demonstration mission and preliminary cost estimates.

1988-01-01

194

Netherlands Cohort Study (NLCS)  

Cancer.gov

The Netherlands Cohort Study (NLCS) started in 1986 and includes 120,852 men and women. The study population originates from 204 municipal population registries throughout The Netherlands, by gender-stratified random sampling.

195

Punnett Square Case Study  

NSDL National Science Digital Library

In this lesson, students will gain experience using Punnett Squares. The case study determines the probability of children having freckles from a freckled father and non-freckled mother. Illustrations guide each step of the case study.

2012-06-04

196

The Study of Algae  

ERIC Educational Resources Information Center

Included in this introduction to the study of algae are drawings of commonly encountered freshwater algae, a summary of the importance of algae, descriptions of the seven major groups of algae, and techniques for collection and study of algae. (CS)

Rushforth, Samuel R.

1977-01-01

197

Melbourne Collaborative Cohort Study  

Cancer.gov

The Melbourne Collaborative Cohort Study is a longitudinal study established in the 1990s by Cancer Council Victoria to investigate prospectively the role of diet and other lifestyle factors in cancer.

198

Case Study Teaching  

ERIC Educational Resources Information Center

This chapter describes the history of case study teaching, types of cases, and experimental data supporting their effectiveness. It also describes a model for comparing the efficacy of the various case study methods. (Contains 1 figure.)

Herreid, Clyde Freeman

2011-01-01

199

Esophagram (Barium Swallow Study)  

MedlinePLUS

... esophagram is a study that is completed in radiology. The test evaluates the esophagus. The esophagus is ... to wear. The study is completed in a radiology (x-ray/fluoroscopy) room. If a child is ...

200

Satellite servicing economic study  

NASA Technical Reports Server (NTRS)

Previous studies have shown that satellite servicing is cost effective; however, all of these studies were of different formats, dollar year, learning rates, availability, etc. Therefore, it was difficult to correlate any useful trends from these studies. The reviewed study was initiated to correlate the economic data into a common data base, using a common set of assumptions. A selected set of existed funded programs was then analyzed to provide an independent analysis of the servicing options and potential economic benefits.

1990-01-01

201

Satellite servicing economic study  

NASA Technical Reports Server (NTRS)

Previous studies have shown that satellite servicing is cost effective; however, all of these studies were of different formats, dollar year, learning rates, availability, etc. Threfore, it was difficult to correlate any useful trends from these studies. The reviewed study was initiated to correlate the economic data into a common data base, using a common set of assumptions. A selected set of existed funded programs was then analyzed to provide an independent analysis of the servicing options and potential economic benefits.

1990-01-01

202

Cultural Environmental Studies  

NSDL National Science Digital Library

The American Studies Program of Washington State University offers this online directory to Websites and resources in cultural environmental studies. The directory presents a subject overview followed by a dozen or more subtopic headings which lead to annotated listings further broken down by subheadings. The site is frequently updated and provides a wealth of links for studying the last two centuries from a cultural studies viewpoint.

203

Case Study: Ellen's Choice  

NSDL National Science Digital Library

This is a case study for undergraduate students in anatomy and physiology. In particular this case study explores spinal anatomy, aging of bone, and explores the basic physiology of inflammation. Users of the National Center for Case Study Teaching in Science will be required to register (free) to gain access to the answer key (and must be of teaching status to receive the key). Included in the resource are the case overview, objectives, case study, teaching notes and answer key.

Elizabeth Harper (New York University Steinhardt School of Education Department of Health Studies)

2001-04-03

204

Boeing flywheel study  

SciTech Connect

The major features of the history of the Boeing flywheel were studied. The analysis of the regenerative fuel cell was started as an outgrowth of the original Boeing study of the Space Operations Center, and was completed in November 1982 with the publication of the final report number D180-27160-1. The current flywheel effort attempts to study the integrated flywheel using the same ground rules that were used on the fuel cell study.

Rice, R.R.

1983-12-01

205

Case Study: Uretero What?  

NSDL National Science Digital Library

This is a case study for high school, undergraduate and/or professional students in physiology and anatomy. In particular this case study explores reproductive biology. Users of the National Center for Case Study Teaching in Science will be required to register (free) to gain access to the answer key (and must be of teaching status to receive the key). Included in the resource are the case overview, objectives, case study, teaching notes and answer key.

Laura Lorentzen (Kean University Science and Technology Education)

2008-04-08

206

Case Study: Chemical Eric  

NSDL National Science Digital Library

This is a case study for high school and undergraduate students in anatomy and physiology. In particular this case study explores anatomy of the pituitary and symptoms and diseases associated with pituitary tumors. Users of the National Center for Case Study Teaching in Science will be required to register (free) to gain access to the answer key (and must be of teaching status to receive the key). Included in the resource are the case overview, objectives, case study, teaching notes and answer key.

Eric Ribbens (Western Illinois University Biological Sciences)

2006-01-06

207

Case Study: Shark Attack  

NSDL National Science Digital Library

This is a case study for undergraduate students in anatomy or anatomy lab. In particular this case study explores the anatomy of the upper extremity. Users of the National Center for Case Study Teaching in Science will be required to register (free) to gain access to the answer key (and must be of teaching status to receive the key). Included in the resource are the case overview, objectives, case study, teaching notes and answer key.

Herbert House (Elon University Biology)

2002-05-24

208

Case Study: Missing Link  

NSDL National Science Digital Library

This is a case study for high school and/or undergraduate students in physical anthropology. In particular this case study explores skull anatomy. Users of the National Center for Case Study Teaching in Science will be required to register (free) to gain access to the answer key (and must be of teaching status to receive the key). Included in the resource are the case overview, objectives, case study, teaching notes and answer key.

Elizabeth Strasser (Sacramento State Anthropology)

2000-09-02

209

Habitat Study. Transect Study. [Environmental Education Units.  

ERIC Educational Resources Information Center

These three documents outline teaching activities intended to involve children with their environment. Suggested preliminary studies to motivate and familiarize elementary school students with some characteristics of organisms and their physical environment are followed by descriptions of class activities that may be undertaken in the field.…

Minneapolis Independent School District 275, Minn.

210

Women's and Gender Studies  

E-print Network

and the world around us. The Pauline Jewett Institute of Women's and Gender Studies offers a stimulating; the history of women; and gender and the family. In addition, Carleton University and the UniversityWomen's and Gender Studies #12;Women's and Gender Studies at Carleton University provides you

Dawson, Jeff W.

211

study programs in mathematics  

E-print Network

study programs in m mathematics 1_ matematika 2008.qxp 16.7.2008 16:41 Page 1 #12;1_ matematika 2008.qxp 16.7.2008 16:41 Page 2 #12;3 CONTENTS 5 Introduction 7 Mathematics at the University of Ljubljana 9 Department of Mathematics information page Academic study program in Mathematics Academic study

Â?umer, Slobodan

212

PRINCETON UNIVERSITY STUDY ABROAD  

E-print Network

PRINCETON UNIVERSITY 2014-15 STUDY ABROAD FINANCIAL AID AND ESTIMATED BUDGET FORM Return '14 ___Spring '15 ____2014-15 Academic Year I. Study Abroad Program/Billing Information (for more BUDGET The cost of attendance will only include reasonable expenses related to your study abroad program

213

OFFICESOFFICES GROUP STUDY  

E-print Network

SOUTH GROUP STUDY SPACES MEDIA ROOM MICROFICHE/ MICROFILM CURRENT JOURNALS REFERENCE COLLECTION & GOVERNMENT DOCUMENTS ATHENA COMPUTERS & ADA STATION SCANNER, COPIER, PUBLIC PRINTER PUBLIC COMPUTERS & SCANNER STUDY SPACE STUDY SPACE 5 DVD/VHS BRO W SERY NEWBOOKS 6 SOUTH EAST WEST Q335-QA76.7 ATHENA

214

ATBC Study - Current Projects  

Cancer.gov

Skip to Main Content Home Contact Us Links Study Details Questionnaires & Forms Current Projects ATBC Study Bibliography Study Investigators & Collaborators Proposal Review & Collaboration Research Consortium Projects Current Projects Prostate Lung Colorectal Pancreas Bladder Gastric Esophagus Renal Lymphomas/Leukemias Liver/biliary Head

215

Student Access Study.  

ERIC Educational Resources Information Center

This study of Wyoming citizen access to community college education explored several factors related to college enrollments over the period 1990-1997. The study further examined projected student enrollment for 1998-2006. This study reports on the findings for: (1) Wyoming population trends and community college enrollments and projected…

Wyoming Community Coll. Commission, Cheyenne.

216

Qualitative Studies: Historiographical Antecedents.  

ERIC Educational Resources Information Center

This paper provides an overview of qualitative studies' antecedents among historiographers and of the positivist tide which nearly engulfed them. Humans live by interpretations. The task of social science--the basic task of qualitative studies--is to study these interpretations so that we can better understand the meanings which people use to…

Mills, Rilla Dean

217

Study Title: Principal Investigator  

E-print Network

of the signed and dated written consent form for the study. 10. The opportunity to consent freely to the study relationship: _________________________ #12;Short Form - English (4/26/04) (This form should be accompanied to understand how things work and gain new knowledge. A research study can be about how the body works, what

Biederman, Irving

218

Professors' Irritating Behavior Study  

ERIC Educational Resources Information Center

The purpose of this study was to quantify the irritating behaviors of professors as experienced and reported by 232 Le Moyne College students. In this study, "irritating behavior" was understood as "actions that vex, annoy, bother, pester, frustrate, or provoke anger." The survey used in this study was developed by Larry M. Ludewig, Ph.D.,…

Malikow, Max

2007-01-01

219

Tailored Barium Swallow Study  

MedlinePLUS

Tailored Barium Swallow Study The TBS is a special study that is completed in radiology. The test evaluates the mouth and the throat ... and may be asked to feed the child. Study Participants You/Your child will drink liquids or ...

220

NYU Women's Health Study  

Cancer.gov

For more than 25 years, the NYU Women’s Health Study has been committed to studying the potential causes of serious diseases in women in the United States. When the study began in 1985, its goal was to identify the role of hormones and diet in the development of the most common cancers in women, especially breast cancer.

221

LITEE Case Studies  

NSDL National Science Digital Library

The LITEE team has developed case studies designed to enhance student learning through direct participation in the decision-making process and development of higher-level cognitive skills. Case studies increase student interest in the engineering field and improve retention in engineering programs. Case Studies include lessons incorporating several different types of business models and are available to view online for free.

222

World Biofuels Study  

Microsoft Academic Search

This report forms part of a project entitled 'World Biofuels Study'. The objective is to study world biofuel markets and to examine the possible contribution that biofuel imports could make to help meet the Renewable Fuel Standard (RFS) of the Energy Independence and Security Act of 2007 (EISA). The study was sponsored by the Biomass Program of the Assistant Secretary

Alfstad

2008-01-01

223

Foreign Studies: Teacher's Guide.  

ERIC Educational Resources Information Center

Foreign Studies, an elective course for junior and senior students, is a study of selected Asian cultures, including the nations of China, Japan, and India, and of African cultures, including the nations of Nigeria, Ethiopia, and the Democratic Republic of the Congo. Asia and Africa are studied from the American cultural viewpoint with emphasis…

Hantula, James

224

American Studies through Folktales.  

ERIC Educational Resources Information Center

American studies is a combination of fields such as literature, history, philosophy, politics, and economics. This publication examines how the different fields of study relate to American studies through folklore or folktales. The use of folktales can provide better illustrations and understandings of U.S. individuals' heritage and evolution.…

Pedersen, E. Martin

1992-01-01

225

MICROBIOLOGY Program of Study  

E-print Network

MICROBIOLOGY Program of Study Financial Aid Research Facilities Students Applying Correspondence.D. in Microbiology. The course of study includes a requirement for a graduate level seminar course each semester School. A non-thesis Master's, the Master of Professional Studies in Microbiology, is also offered. All

Thomas, Andrew

226

Women's Studies (undergraduate)  

E-print Network

348 Women's Studies (undergraduate) The Women's Studies Program offers an interdisciplinary course of study in the historical, economic, political, social and cultural experi- ence of women. The program, its intersections with race, class, sexuality and generation, and the allocation of rights

Suzuki, Masatsugu

227

WISCONSIN LONGITUDINAL STUDY (WLS)  

EPA Science Inventory

The Wisconsin Longitudinal Study (WLS) is a long-term study of a random sample of 10,317 men and women who graduated from Wisconsin high schools in 1957. The WLS provides an opportunity to study of the life course, intergenerational transfers and relationships, family functioning...

228

ACCELERATOR RESEARCH STUDIES  

SciTech Connect

ACCELERATOR RESEARCH STUDIES Task A: Study of the Physics of Space-Charge Dominated Beams for Advanced Accelerator Applications Task B: Studies of High-Power Gyroklystrons and Application to Linear Colliders Task C: Theory and Simulation of the Physics Space-Charge Dominated Beams Annual Report for the Period June 1, 2003 to May 31, 2004

P.G. O'Shea, M. Reiser, V. L. Granatstein, W. Lawson, I. Haber, R. Kishek

2004-01-23

229

Social Psychoanalytic Disability Studies  

ERIC Educational Resources Information Center

This paper explores connections and tensions between psychoanalysis and disability studies. The first part of the paper considers contemporaneous engagements with the psyche by a number of disability studies writers. These scholars have remained accountable to a politicised disability studies but have pushed for critical encounters with the…

Goodley, Dan

2011-01-01

230

Heat transfer studies  

Microsoft Academic Search

Work continued from last quarter related to studies of heat transfer and fluid flow in porous media. One experiment focused on issues of drying in subresidually-saturated systems. The other experiment deals with studies of flows in a repository-like geometry around a heated horizontal annulus. In the subresidual saturation studies, elevated temperature environments were considered during this quarter. A 1 in.

R. Boehm; Y. T. Chen; A. K. Sathappan

1995-01-01

231

Three VAT Studies  

Microsoft Academic Search

This volume presents three studies on the VAT. The first study is a VAT primer for lawyers, economists, and accountants who rarely talk to each other about tax issues, particularly in the Netherlands. The different views illuminate the nature and workings of the VAT.The second study examines and evaluates VAT coordination in the EU against the backdrop of an analysis

Sijbren Cnossen

2010-01-01

232

Vacation Study Abroad.  

ERIC Educational Resources Information Center

A guide to summer study abroad is presented with information on how to plan rewarding summer study and travel overseas. Concise descriptions of over 1300 postsecondary study programs worldwide (in over 65 countries) sponsored by U.S. and foreign universities and institutions are included with details on program sponsor and name, location, dates,…

Howard, E. Marguerite, Ed.

233

Home Start Evaluation Study.  

ERIC Educational Resources Information Center

Case studies of seven Home Start programs are given as the third section of an evaluation study. Communities involved are Huntsville, Alabama; Fairbanks, Alaska; Fort Defiance, Arizona; Dardanelle, Arkansas; Wichita, Kansas; Gloucester, Massachusetts; and Reno, Nevada. Although each study varies in format, each describes in detail the degree and…

High/Scope Educational Research Foundation, Ypsilanti, MI.

234

Mars Aerocapture Systems Study  

NASA Technical Reports Server (NTRS)

Mars Aerocapture Systems Study (MASS) is a detailed study of the application of aerocapture to a large Mars robotic orbiter to assess and identify key technology gaps. This study addressed use of an Opposition class return segment for use in the Mars Sample Return architecture. Study addressed mission architecture issues as well as system design. Key trade studies focused on design of aerocapture aeroshell, spacecraft design and packaging, guidance, navigation and control with simulation, computational fluid dynamics, and thermal protection system sizing. Detailed master equipment lists are included as well as a cursory cost assessment.

Wright, Henry S.; Oh, David Y.; Westhelle, Carlos H.; Fisher, Jody L.; Dyke, R. Eric; Edquist, Karl T.; Brown, James L.; Justh, Hilary L.; Munk, Michelle M.

2006-01-01

235

UBC CASE STUDY / Social, Ecological, Economical Developmental Studies (SEEDS) UBC CASE STUDY/  

E-print Network

UBC CASE STUDY / Social, Ecological, Economical Developmental Studies (SEEDS) UBC CASE STUDY/ SOCIAL, ECOLOCIAL, ECONOMIC DEVELOPMENT STUDIES (SEEDS) UBC Sustainability Office CASE STUDY/ SOCIAL, ECOLOCIAL, ECONOMIC DEVELOPMENT STUDIES (SEEDS) UBC Campus Sustainability Office #12;UBC CASE STUDY / Social

236

Advanced Clothing Studies  

NASA Technical Reports Server (NTRS)

All human space missions require significant logistical mass and volume that add an unprecedented burden on longduration missions beyond low-Earth orbit. For these missions with limited cleaning resources, a new wardrobe must be developed to reduce this logistical burden by reducing clothing mass and extending clothing wear. The present studies have been undertaken, for the first time, to measure length of wear and to assess the acceptance of such extended wear. Garments in these studies are commercially available exercise T-shirts and shorts, routine-wear T-shirts, and longsleeved pullover shirts. Fabric composition (cotton, polyester, light-weight, superfine Merino wool, modacrylic, cotton/rayon, polyester/Cocona, modacrylic/Xstatic, modacrylic/rayon, modacrylic/lyocell/aramid), construction (open knit, tight knit, open weave, tight weave), and finishing treatment (none, quaternary ammonium salt) are the independent variables. Eleven studies are reported here: five studies of exercise T-shirts, three of exercise shorts, two of routine wear Tshirts, and one of shirts used as sleep-wear. All studies are conducted in a climate-controlled environment, similar to a space vehicle's. For exercise clothing, study participants wear the garments during aerobic exercise. For routine wear clothing, study participants wear the T-shirts daily in an office or laboratory. Daily questionnaires collected data on ordinal preferences of nine sensory elements and on reason for retiring a used garment. Study 1 compares knitted cotton, polyester, and Merino exercise T-shirts (61 participants), study 2, knitted polyester, modacrylic, and polyester/Cocona exercise T-shirts (40 participants), study 3, cotton and polyester exercise shorts, knitted and woven (70 participants), all three using factorial experimental designs with and without a finishing treatment, conducted at the Johnson Space Center, sharing study participants. Study 4 compares knitted polyester and ZQ Merino exercise T-shirts, study 5, knitted ZQ Merino and modacrylic routine-wear T-shirts, with study 6 using only knitted polyester exercise shorts. No finishing treatment is used. Studies 4 and 5 use cross-over experimental designs, and all three studies were conducted aboard the ISS with six crew. Studies 4 and 6 were repeated on the ground with the same participants to learn if perception was affected microgravity. Study 7 is a longer-term, single-blind panel study of knitted routine-wear undershirts with at least 12 participants to assess tolerance to Merino by comparing it with a cotton/rayon blends, using a cross-over design, eliminating carryover effects with wash-out periods between shirts.

Orndoff, Evelyne; Poritz, Darwin

2014-01-01

237

The case study approach.  

PubMed

The case study approach allows in-depth, multi-faceted explorations of complex issues in their real-life settings. The value of the case study approach is well recognised in the fields of business, law and policy, but somewhat less so in health services research. Based on our experiences of conducting several health-related case studies, we reflect on the different types of case study design, the specific research questions this approach can help answer, the data sources that tend to be used, and the particular advantages and disadvantages of employing this methodological approach. The paper concludes with key pointers to aid those designing and appraising proposals for conducting case study research, and a checklist to help readers assess the quality of case study reports. PMID:21707982

Crowe, Sarah; Cresswell, Kathrin; Robertson, Ann; Huby, Guro; Avery, Anthony; Sheikh, Aziz

2011-01-01

238

Teleoperator Human Factors Study  

NASA Technical Reports Server (NTRS)

An investigation of the spectrum of space teleoperation activities likely in the 1985 to 1995 decade focused on the resolution of critical human engineering issues and characterization of the technology effect on performance of remote human operators. The study began with the identification and documentation of a set of representative reference teleoperator tasks. For each task, technology, development, and design options, issues, and alternatives that bear on human operator performance were defined and categorized. A literature survey identified existing studies of man/machine issues. For each teleoperations category, an assessment was made of the state of knowledge on a scale from adequate to void. The tests, experiments, and analyses necessary to provide the missing elements of knowledge were then defined. A limited set of tests were actually performed, including operator selection, baseline task definition, control mode study, lighting study, camera study, and preliminary time delay study.

1986-01-01

239

Lewisville Neighborhood Development Study  

E-print Network

: Tareq Abdullah Stephan Gage Himanshu Grover Madhu Narayanasamy Fox Avenue Corridor: Redevelopment Study – 2006 6 Analysis of U.S. Census Data The Fox Avenue Study Area (FASA) consists of all the block groups of census tract 217.13 and block... remained stable and are selling at typical prices for comparable age and square footage. This sub-section is an analysis of the local economy in the Fox Avenue study area. Prepared by: Tareq Abdullah Stephan Gage Himanshu Grover Madhu Narayanasamy...

Bright, Elise; Abdullah, Tareq; Gage, Stephan; Grover, Himanshu; Narayanasamy, Madhu; Li, Tom; Roman, Lee Ann; Toffer, Jon; Chady, Leslie; Croxell, Christina; Harpst, Kristi; Gifford, Kevin; Maddox, Jordan; Mathur, Dipti; Parashar, Rajat; Verma, Sudhish

2006-01-01

240

Pathology Case Study: Hydrocephalus  

NSDL National Science Digital Library

The University of Pittsburgh School of Medicine's Department of Pathology has compiled a series of case studies to help both students and instructors. In this particular study an otherwise healthy 9 month old infant is presented with hydrocephalus. The case study provides test results and images along with microscopic photos and description. Clicking on the final diagnosis provides a thorough explanation of the diagnosis and treatment.

241

The Stream Study  

NSDL National Science Digital Library

The Stream Study provides a method to determine the water quality of a stream based on the collection and identification of stream-bottom macroinvertebrates. This is a multi-chapter activity designed for teachers, parents, and students. Specific sections of this site include the following: why it is important to study stream-bottom macroinvertebrates, identification of stream-bottom macroinvertebrates, collection and interpretation of data, and a glossary of terms used in the stream study.

Rick Webb

1999-03-01

242

HTGR risk assessment study  

Microsoft Academic Search

The Accident Initiation and Progression Analysis (AIPA) Study being performed for the high-temperature gas-cooled reactor (HTGR) utilizes methods of probabilistic risk assessment similar to those used in the Reactor Safety Study (WASH-1400). Analytical methods are employed for the treatment of common cause failures involving human errors and other dependencies in redundant systems. The original objective of the AIPA study was

V. Joksimovic; W. J. Houghton; D. E. Emon

1977-01-01

243

New marine studies center  

NASA Astrophysics Data System (ADS)

Temple University has established a Center for Marine Studies with faculty members from four of its colleges. The center will offer courses leading to a certificate in marine studies.Studies will focus on urbanization's impact on the marine environment and will focus on management and economics of waterfront utilization. In addition, faculty members will be constructing an artificial reef off Absecon Inlet to determine if increasing protective environments will permit increased sport fishing.

244

Measuring Study Effectiveness  

NSDL National Science Digital Library

This model-eliciting activity challenges students to operationally define a construct (study effectiveness). Students are given a survey to review that rates different aspects of study behaviors. They are then given a set of data for a few students and asked to use their scores to determine an index of study effectiveness. After determining a method, they are then asked to use this index to put five students in rank order according to their scores on study effectiveness. Students write a report explaining the method they used to determine these scores and how they produced their ratings.

This page was authored by the CATALST Group at the University of Minnesota, based on an original activity by Richard Lesh at Purdue University.

245

Access to space studies  

NASA Technical Reports Server (NTRS)

The National Aeronautics and Space Administration is currently considering possible directions in Earth-to-orbit vehicle development under a study called 'Access to Space.' This agency-wide study is considering commercial launch vehicles, human transportation, space station logistics, and other space transportation requirements over the next 40 years. Three options are being considered for human transportation: continued use of the Space Shuttle; development of a small personnel carrier (personnel logistics system (PLS)); or development of an advanced vehicle such as a single-stage-to-orbit (SSTO). Several studies related to the overall Access to Space study are reported in this document.

Martin, James A.

1993-01-01

246

Michigan Feminist Studies  

NSDL National Science Digital Library

The interdisciplinary Michigan Feminist Studies journal was first published in 1978 under the title, "Occasional Papers in Women's Studies." In 1989, the journal became Michigan Feminist Studies, an annual publication that continues to be affiliated with the Program in Women's Studies at the University of Michigan. Visitors to this site can browse through all of the archived issues here or look over the various titles and topics. Some of the special issues cover deviance, knowledge, and the future of feminism. Interested users can also sign up to receive notices when new issues are published.

247

Communications systems checkout study  

NASA Technical Reports Server (NTRS)

The results and conclusions of an engineering study of Space Station communications subsystem checkout are reported. The primary purpose of the study is to recommend specific guidelines and constraints for the design and utilization of the communications subsystem leading to a practical and effective means of onboard checkout implementation. Major study objectives are as follows: (1) identify candidate communications subsystem checkout concepts, (2) determine implementation impacts of feasible concepts, (3) evaluate practicality and effectiveness of alternative concepts, (4) propose baseline modifications to accommodate preferred concepts, and (5) recommend areas for additional investigation. In addition, study results are interpreted, where appropriate, in terms of their applicability to checkout of Shuttle-Orbiter communications subsystem.

Ginter, W. G.

1972-01-01

248

Southern Community Cohort Study  

Cancer.gov

The current body of knowledge regarding the etiology and prevention of cancer draws substantially from prospective epidemiologic studies, among which African Americans have been greatly underrepresented.

249

Case Study: Football Fanaticism  

NSDL National Science Digital Library

This is a case study for undergraduate and professional degree students in anatomy, physiology and/or pharmaceutical sciences. In particular this case study explores the anatomy of the central nervous system, major motor and sensory tracts. Integrative physiology courses may use this case to incorporate the immune, nervous and cardiovascular systems. Users of the National Center for Case Study Teaching in Science will be required to register (free) to gain access to the answer key (and must be of teaching status to receive the key). Included in the resource are the case overview, objectives, case study, teaching notes and answer key.

PhD Dayton J Ford (St. Louis College of Pharmacy Department of Pharmaceutical Sciences)

2003-07-03

250

Xenia Spacecraft Study  

NASA Technical Reports Server (NTRS)

This slide presentation reviews the proposed design for the Xenia mission spacecraft. The goal of this study is to perform a mission concept study for the mission. Included in this study are: the overall ground rules and assumptions (GR&A), a mission analysis, the configuration, the mass properties, the guidance, Navigation and control, the proposed avionics, the power system, the thermal protection system, the propulsion system, and the proposed structures. Conclusions from the study indicate that the observatory fits within the Falcon 9 mass and volume envelope for launching from Omelek, the pointing, slow slewing, and fast slewing requirements and the thermal requirements are met.

Hopkins, Randy

2009-01-01

251

Future Spacelift Requirements Study  

NASA Technical Reports Server (NTRS)

This study addresses future space applications and the derived requirements these potential applications will have on future spacelift systems. This NASA sponsored activity is a comprehensive study of potential missions including those of the military, civil, and commercial users. The study objectively evaluated the key architectural requirements for future launch systems. The results of this study are technical, economic, and policy analyses of future spacelift systems. It is intended to assist NASA and DOD decision-makers in planning technical investments and establishing policy for future U.S. spacelift systems.

1997-01-01

252

STRATNET: Strategic Studies Network  

NSDL National Science Digital Library

The University of Calgary's Strategic Studies Program developed STRATNET to provide a network of research resources germane to the study of international relations, security, and politics. STRATNET includes three main sections: StratChat, an interactive discussion forum; StratLink, a well-organized collection of hundreds of annotated strategic studies pointers; and StratJournal, which contains a multidisciplinary online journal entitled STRATNET. In addition, the site provides information about the fellows and the outreach projects of the Strategic Studies Program at the University of Calgary.

253

. (University of Rochester) (Study Abroad) . ,  

E-print Network

, . (University of Rochester) (Study Abroad) . , . . , , . , . (Center for Study Abroad) , (Study Abroad Orientation) , , , . http-mail) Yahoo Gmail . . River Campus , CPU box . 8 #12; (Study Abroad Office

Mahon, Bradford Z.

254

Nondestructive testing of adhesive bonds by nuclear quadrupole resonance method  

NASA Technical Reports Server (NTRS)

Inert, strain sensitive tracer, cuprous oxide, added to polymeric adhesive ensures sufficiently large signal to noise ratio in NQR system output. Method is successful, provided that RF-transparent structural materials are used between modified adhesive and probe of NQR spectrometer.

Hewitt, R. R.

1971-01-01

255

Social Studies Resource Units.  

ERIC Educational Resources Information Center

Based on the premise that fundamental solutions to environmental problems must include social solutions, these three resource units are designed to study the interrelation of man and nature as part of the social studies curriculum. A series of inquiry questions are posed with the intent of stimulating students to find solutions to our…

Bemiss, Clair W.

256

NACUBO Endowment Study, 1995.  

ERIC Educational Resources Information Center

This report presents the results of the 1995 study of the performance and management of college and university endowments, based on 394 institutions providing data. A summary abstract provides an overview of performance and investment data; and Part 1 of the study provides a brief commentary covering endowment characteristics, historical…

Cambridge Associates, Inc., Boston, MA.

257

MATHEMATICS Program of Study  

E-print Network

MATHEMATICS Program of Study Degree Requirements The Department offers a program leading to the degree of Master of Arts in Mathematics. There are three "pathways" or tracks for advanced study in mathematics: pure, interdisciplinary, and statistics. All paths provide both thesis and non-thesis options

Thomas, Andrew

258

Graduate School POLICY STUDIES  

E-print Network

Graduate School Graduate School POLICY STUDIES Doctor of Philosophy Certificate clemson university in policy studies enables a student to attain a high degree of specialized competence in policy analysis organization, as well as other social science skills in the analysis and development of policy. Fundamental

Stuart, Steven J.

259

FUEL DELIVERY TEMPERATURE STUDY  

E-print Network

Elkins ­ California State Water Resources Control Board Kurt Floren ­ Los Angeles County AgriculturalCALIFORNIA ENERGY COMMISSION FUEL DELIVERY TEMPERATURE STUDY COMMISSIONREPORT March 2009 CEC-600 and Nicholas Janusch, 2009. Fuel Delivery Temperature Study, California Energy Commission. CEC-600-2009-002-CMF

260

Comparative Ethnic Studies  

E-print Network

: Foundations of Comparative Ethnic Studies CES 209: Hip Hop Around the Globe CES 260: Race and Racism in US and Sexuality CES 301: Race and Global Inequality CES 446: Racism and Anti-Racism in Global Context CES 491: Theories of Racism and Ethnic Conflicts W ST 201: Critical Frameworks in Gender Studies Math Requirement

Collins, Gary S.

261

Interagency Depainting Study Status  

NASA Technical Reports Server (NTRS)

This document discusses coating removal in general. Sections of this presentation include: regulatory background, the initial parameters of the study, the current parameters of the study, stages in each sequence, preparation of the test specimen, material evaluation testing, chemical stripping, CO2 blasting, Flashjet coating removal, plastic media blasting, sodium bicarbonate wet stripping, water stripping, and wheat starch stripping.

Clark-Ingram, Marceia; Cook, Beth

1999-01-01

262

COLD WEATHER PLUME STUDY  

EPA Science Inventory

While many studies of power plant plume transport and transformation have been performed during the summer, few studies of these processes during the winter have been carried out. Accordingly, the U.S. Environmental Protection Agency and the Electric Power Research Institute join...

263

Simulation in International Studies  

ERIC Educational Resources Information Center

Social scientists have long worked to replicate real-world phenomena in their research and teaching environments. Unlike our biophysical science colleagues, we are faced with an area of study that is not governed by the laws of physics and other more predictable relationships. As a result, social scientists, and international studies scholars more…

Boyer, Mark A.

2011-01-01

264

Fluctuation studies in STAR  

E-print Network

Study of event by event fluctuations of thermodynamic quantities offer us more insight about the hot and dense matter created in the relativistic heavy ion collisions. In this review the recent results on these studies carried out by the STAR collaboration are presented.

Supriya Das

2006-12-08

265

TOTAL DIET STUDY  

EPA Science Inventory

The Total Diet Study (TDS), sometimes called the Market Basket Study, is an ongoing FDA program that determines levels of various pesticide residues, contaminants, and nutrients in foods, for the purpose of estimating intakes of these substances in representative diets of specifi...

266

Veterinary Medicine Undergraduate study  

E-print Network

Veterinary Medicine & Surgery Undergraduate study #12;`Our main piece of advice is, if you come facilities. You'll also want to study somewhere with an international reputation, high graduate employment for sport, one of the best libraries in Europe and a new student services building where you can get advice

Glasgow, University of

267

Institute /or ADVANCED STUDY  

E-print Network

#12;#12;#12;#12;Institute /or ADVANCED STUDY REPORT FOR THE ACADEMIC YEAR 1995-96 PRINCETON NEW JERSEY #12;#12;Institute /or ADVANCED STUDY REPORT FOR THE ACADEMIC YEAR 1995 - 96 OLDEN LANE PRINCETON, or sex. We feel strongly that the spirit characteristic of America at its noblest, above all the pursuit

268

Institute for ADVANCED STUDY  

E-print Network

#12;#12;#12;#12;Institute for ADVANCED STUDY REPORT FOR THE ACADEMIC YEAR 1996-97 PRINCETON NEW JERSEY #12;#12;Institute for ADVANCED STUDY REPORT FOR THE ACADEMIC YEAR 1996-97 OLDEN LANE PRINCETON be taken, directly or indirectly, of race, religion, or sex. We feel strongly that the spirit

269

Goiania incident case study  

Microsoft Academic Search

The reasons for wanting to document this case study and present the findings are simple. According to USDOE technical risk assessments (and our own initial work on the Hanford socioeconomic study), the likelihood of a major accident involving exposure to radioactive materials in the process of site characterization, construction, operation, and closure of a high-level waste repository is extremely remote.

Petterson

1988-01-01

270

A Cemetery Study.  

ERIC Educational Resources Information Center

Employing an interdisciplinary approach, this outdoor education guide to the study of cemeteries is designed for older elementary and younger secondary students. Suggestions are provided for activities involving the study of history, geology, mathematics, art, language arts, and values. For example, the cemetery markers lend themselves to art…

Hurst, Donald L.

271

Medical Insurance Feasibility Study  

PubMed Central

There are risks of adverse outcomes to patients in the course of health care management. A study was undertaken to measure these outcomes in California for 1974. Secondary benefits of the study include new insights into the types and sources of disabilities caused by health care management and the development of new methods for carrying out generic adverse-outcome monitoring. PMID:664637

Mills, Don Harper

1978-01-01

272

Work Sharing Case Studies.  

ERIC Educational Resources Information Center

Designed to provide private sector employers with the practical information necessary to select and then to design and implement work sharing arrangements, this book presents case studies of some 36 work sharing programs. Topics covered in the case studies include the circumstances leading to adoption of the program, details of compensation and…

McCarthy, Maureen E.; And Others

273

Five year spinning study  

Technology Transfer Automated Retrieval System (TEKTRAN)

The USDA-ARS Cotton Quality Research Station (CQRS) has complete a comprehensive study of the relationship of cotton fiber properties to the quality of ring spun yarn. Cottons in this study demonstrated fiber quality traits that allow them to operate at high speeds on the latest generation of ring ...

274

Energy conversion alternatives study  

NASA Technical Reports Server (NTRS)

Comparison of coal based energy systems is given. Study identifies and compares various advanced energy conversion systems using coal or coal derived fuels for baselaoad electric power generation. Energy Conversion Alternatives Study (ECAS) reports provede government, industry, and general public with technically consistent basis for comparison of system's options of interest for fossilfired electric-utility application.

Shure, L. T.

1979-01-01

275

Reverse Transfer Student Study.  

ERIC Educational Resources Information Center

After a preliminary study revealed that 21% of all credit students at Santa Ana College (SAC) had previously attended a four-year institution, a further study was conducted to determine the educational interests and matriculation patterns of these reverse transfer students. A sample of 360 reverse transfer students was selected for interviews,…

Slark, Julie

276

Managerial Accounting. Study Guide.  

ERIC Educational Resources Information Center

This self-instructional study guide is part of the materials for a college-level programmed course in managerial accounting. The study guide is intended for use by students in conjuction with a separate textbook, Horngren's "Accounting for Management Control: An Introduction," and a workbook, Curry's "Student Guide to Accounting for Management…

Plachta, Leonard E.

277

Lesson Study: Beyond Coaching  

ERIC Educational Resources Information Center

The authors assert that lesson study--a collaborative, teacher-led approach to learning from practice--offers a deeper, broader, more sustainable method of improving teacher practice than one-on-one coaching does. In lesson study, teachers and coaches of all levels of experience can work together, each bringing his or her own professional…

Lewis, Catherine; Perry, Rebecca; Foster, David; Hurd, Jacqueline; Fisher, Linda

2011-01-01

278

The Study of Comets  

Microsoft Academic Search

The study of comets is critical to our understanding the origin, structure and evolution of the solar system in general and of life itself. We present here a brief summary of our current understanding of comets and their important place in the solar system, as well as our recommendations regarding priorities for their study over the next decade in the

M. R. Combi; M. T. Capria; G. Cremonese; M. C. de Sanctis; T. L. Farnham; Y. R. Fernandez; M. C. Festou; U. Fink; J. R. Green; W. M. Harris; C. W. Hergenrother; P. L. Lamy; S. M. Larson; H. F. Levison; D. J. Lien; C. M. Lisse; D. D. Meisel; D. T. F. Moehlmann; B. E. A. Mueller; N. H. Samarasinha; M. L. Sitko; H. A. Weaver; P. R. Weissman

2002-01-01

279

Introduction to Childhood Studies  

ERIC Educational Resources Information Center

Educationalists and social scientists are increasingly interested in childhood as a distinct social category, and Childhood Studies is now a recognized area of research and analysis. This book brings together the key themes of Childhood Studies in a broad and accessible introduction for students and practitioners working in this field.…

Kehily, Mary Jane, Ed.

2004-01-01

280

Distance Learning Case Studies.  

ERIC Educational Resources Information Center

The Office of Technology Assessment authorized a series of case studies in 1989 to investigate how technologies, services, and programs are implemented in distance education projects. The studies were also intended to look at the role of local, state, and federal agencies, and other public and private entities in providing educational services to…

Barker, Bruce O.

281

Study Close-Out  

Cancer.gov

Step 4: Closing Out a Cancer Prevention Clinical Trial These documents are intended for the use of DCP Consorta staff conducting cancer chemoprevention studies under contract with NCI/DCP. SOP #2: Study Close-Out Responsibilities (SOP) (doc, 48kb) Lists

282

Teaching Lesbian Studies  

Microsoft Academic Search

Editorial Note: This essay on teaching lesbian studies is the first submission in a new feature in the Journal of Homosexuality, aimed at providing guidance to students and faculty who wish to teach courses in LGBT studies or to learn about basic concepts in the field such as minority stress, coming out models, heterosexism, etc. Esther D. Rothblum starts us

Esther D. Rothblum

2012-01-01

283

AMTEC material studies  

Microsoft Academic Search

Texas A&M University, in conjunction with Advanced Modular Power Systems, is performing a series of material studies on key components of an alkali metal thermal to electric conversion (AMTEC) cell for the NASA outer planets power system program. These studies involve SEM, x-ray mapping, EDS, and WDS analysis of AMTEC components from unexposed (as built) samples, from sodium exposure tests,

Michael Schuller; Brad Fiebig; Patricia Hudson; Robert Svedberg

1999-01-01

284

studies CP2001 Constraints  

E-print Network

CP'01 Part III ­ Case studies CP2001 Tutorial ­ Cyprus November 2001 ­ Case studies -- p.1/20 #12; CP'01 Problems and Soft Constraints Typical real problems include: Hard constraints (physical approach: ad­hoc heuristic (but often efficient) handling. CP2001 Tutorial ­ Cyprus November 2001 ­ Case

Rossi, Francesca

285

LITEM039: Case Studies  

Microsoft Academic Search

This seminar looks at ways in which specific author s\\/works pass into other cultures through translation. This year's set of case studies will i nvolve close textual study of a range of different texts to examine how translators have tackled probl ems of linguistic and cultural difference. The source texts will be taken from a variety of langua ges including

Janet Garton

286

Contemporary China Studies  

E-print Network

Contemporary China Studies Postgraduate #12;Programme: Contemporary China Studies Postgraduate1 Chinese - Level 2 5 2 · Basic vocabulary & grammar Dealing with China: 3 1 Intercultural management · China's political constellation and its impact on business life · Human resources issues for China

Einmahl, Uwe

287

Women's Studies Librarian  

NSDL National Science Digital Library

The University of Wisconsin System Women's Studies Librarian offers a web page that provides exhaustive lists of bibliographies of monographs and scholarly articles in women's studies. The site also offers core lists of women's studies books in print on subjects from aging to women of color, compiled by the Association of College and Research Libraries Women's Studies Section. These core lists are intended to aid librarians in building women's collections, as well as guide teaching faculty in selecting course materials. Publishers and prices are provided. The page also points to selected women's Internet subject resources, e-zines and newsletters, and syllabi and course materials. http://www.library.wisc.edu/libraries/WomensStudies/

288

Geysers reservoir studies  

SciTech Connect

LBL is conducting several research projects related to issues of interest to The Geysers operators, including those that deal with understanding the nature of vapor-dominated systems, measuring or inferring reservoir processes and parameters, and studying the effects of liquid injection. All of these topics are directly or indirectly relevant to the development of reservoir strategies aimed at stabilizing or increasing production rates of non-corrosive steam, low in non-condensable gases. Only reservoir engineering studies will be described here, since microearthquake and geochemical projects carried out by LBL or its contractors are discussed in accompanying papers. Three reservoir engineering studies will be described in some detail, that is: (a) Modeling studies of heat transfer and phase distribution in two-phase geothermal reservoirs; (b) Numerical modeling studies of Geysers injection experiments; and (c) Development of a dual-porosity model to calculate mass flow between rock matrix blocks and neighboring fractures.

Bodvarsson, G.S.; Lippmann, M.J.; Pruess, K.

1993-04-01

289

BBC Prison Study  

NSDL National Science Digital Library

The official website for the BBC Prison Study, that accompanies the groundbreaking 2002 BBC Prison Study broadcast, went online in September 2008. The Prison Study put volunteers in a prison-style setting and then filmed them. The purpose of the experiment, conducted by British researchers, was to see how relationships evolved in places such as prisons, as well as in other institutions where unequal power exists, such as schools, barracks, and offices. What they found "changed our basic understanding of how groups and power work"; the study showed when and why people accept or challenge unequal power in groups. Visitors should click on "View The Movie Map", which is in the top left hand corner of the webpage, to see a menu of movie clips of different situations at the prison. The clips explore such situations as "Food Inequalities" to "Prisoners Mobilize Against Guards" to "The Emergence of a New Guard Regime". The menu in the upper left hand corner of the web page has a link to "Activities" which will prove especially useful for educators. The Activities link is further divided into the following sections, "Discussion Questions", "Exercises", and "Psychometric Tests". Each of these sections allows for more in-depth study of the issues raised by the Prison Study. The Psychometric Tests are those given to the volunteers in the study, and can be taken by visitors to the site and compared to the volunteers' scores. The "Resources" link, in the menu in the upper left hand corner of the webpage, includes hypertext links to "Scientific Publications", "Quantitative Data", and a "Glossary", that provide, respectively, a number of full-text articles about the Prison Study that have been published, the data collected during the study, and definitions of psychological terms used in the study.

2008-01-01

290

Tokamak reactor studies  

SciTech Connect

This paper presents an overview of tokamak reactor studies with particular attention to commercial reactor concepts developed within the last three years. Emphasis is placed on DT fueled reactors for electricity production. A brief history of tokamak reactor studies is presented. The STARFIRE, NUWMAK, and HFCTR studies are highlighted. Recent developments that have increased the commercial attractiveness of tokamak reactor designs are discussed. These developments include smaller plant sizes, higher first wall loadings, improved maintenance concepts, steady-state operation, non-divertor particle control, and improved reactor safety features.

Baker, C.C.

1981-01-01

291

IUPAP Report: Benchmarking Study  

NASA Astrophysics Data System (ADS)

This paper reports on an international study that was conducted on the participation of women in physics. Rachel Ivie and Katie Stowe of the Statistical Research Center carried out this study during 2001. Approximately 900 women physicists from over 50 countries provided information about their educational and employment histories. These personal narratives were analyzed in the context of the educational systems of the countries in which the women physicists studied and the economic structure of the countries within which they worked. This paper will also address critical events and environment features that facilitate the participation of women and those that are barriers to their success.

Czujko, Roman

2002-03-01

292

Materials Failure Case Studies  

NSDL National Science Digital Library

This website offers innovative course materials for teaching engineering design and analysis through failure case studies, supporting the integration of research in forensic engineering into undergraduate education. The site includes an introduction to the overall project and a bibliography as well as typical civil engineering and engineering mechanics courses, with over 50 case studies currently listed. This web site is a companion to the book Beyond Failure: Forensic Case Studies for Civil Engineers, Delatte, Norbert J., ASCE Press. The site is a living document that will supplement the book with web links, additional information, and supplemental illustrations. At this time, not all of the cases have been filled in yet.

Delatte, Norbert J., Jr.

2008-12-12

293

Studying aging in Drosophila.  

PubMed

Drosophila melanogaster represents one of the most important genetically accessible model organisms for aging research. Studies in flies have identified single gene mutations that influence lifespan and have characterized endocrine signaling interactions that control homeostasis systemically. Recent studies have focused on the effects of aging on specific tissues and physiological processes, providing a comprehensive picture of age-related tissue dysfunction and the loss of systemic homeostasis. Here we review methodological aspects of this work and highlight technical considerations when using Drosophila to study aging and age-related diseases. PMID:24751824

He, Ying; Jasper, Heinrich

2014-06-15

294

Brazilian Sepsis Epidemiological Study (BASES study)  

PubMed Central

Introduction Consistent data about the incidence and outcome of sepsis in Latin American intensive care units (ICUs), including Brazil, are lacking. This study was designed to verify the actual incidence density and outcome of sepsis in Brazilian ICUs. We also assessed the association between the Consensus Conference criteria and outcome Methods This is a multicenter observational cohort study performed in five private and public, mixed ICUs from two different regions of Brazil. We prospectively followed 1383 adult patients consecutively admitted to those ICUs from May 2001 to January 2002, until their discharge, 28th day of stay, or death. For all patients we collected the following data at ICU admission: age, gender, hospital and ICU admission diagnosis, APACHE II score, and associated underlying diseases. During the following days, we looked for systemic inflammatory response syndrome (SIRS), sepsis, severe sepsis, and septic shock criteria, as well as recording the sequential organ failure assessment score. Infection was diagnosed according to CDC criteria for nosocomial infection, and for community-acquired infection, clinical, radiological and microbiological parameters were used. Results For the whole cohort, median age was 65.2 years (49–76), median length of stay was 2 days (1–6), and the overall 28-day mortality rate was 21.8%. Considering 1383 patients, the incidence density rates for sepsis, severe sepsis and septic shock were 61.4, 35.6 and 30.0 per 1000 patient-days, respectively. The mortality rate of patients with SIRS, sepsis, severe sepsis and septic shock increased progressively from 24.3% to 34.7%, 47.3% and 52.2%, respectively. For patients with SIRS without infection the mortality rate was 11.3%. The main source of infection was lung/respiratory tract. Conclusion Our preliminary data suggest that sepsis is a major public health problem in Brazilian ICUs, with an incidence density about 57 per 1000 patient-days. Moreover, there was a close association between ACCP/SCCM categories and mortality rate. PMID:15312226

Silva, Eliézer; Pedro, Marcelo de Almeida; Sogayar, Ana Cristina Beltrami; Mohovic, Tatiana; Silva, Carla Lika de Oliveira; Janiszewski, Mariano; Cal, Ruy Guilherme Rodrigues; de Sousa, Érica Fernandes; Abe, Thereza Phitoe; de Andrade, Joel; de Matos, Jorge Dias; Rezende, Ederlon; Assunção, Murillo; Avezum, Álvaro; Rocha, Patrícia CS; de Matos, Gustavo Faissol Janot; Bento, André Moreira; Corrêa, Alice Danielli; Vieira, Paulo Cesar Bastos; Knobel, Elias

2004-01-01

295

Cancers Selected for Study  

Cancer.gov

The Cancer Genome Atlas researchers are mapping the genetic changes in 20 cancers. Find out which cancers have been selected for study, the criteria for selection and the scientific questions being asked about each cancer.

296

Accelerator research studies  

SciTech Connect

The Accelerator Research Studies program at the University of Maryland, sponsored by the Department of Energy under grant number DE-FG05-91ER40642, is currently in the second year of a three-year funding cycle. The program consists of the following three tasks: TASK A, Study of Transport and Longitudinal Compression of Intense, High-Brightness Beams,'' (P.I., M. Reiser); TASK B, Study of Collective Ion Acceleration by Intense Electron Beams and Pseudospark Produced High Brightness Electron Beams,'' (Co-P.I.'s, W.W. Destler, M. Reiser, M.J. Rhee, and C.D. Striffler); TASK C, Study of a Gyroklystron High-Power Microwave Source for Linear Colliders,'' (Co-P.I.'s, V.L. Granatstein, W. Lawson, M. Reiser, and C.D. Striffler). In this report we document the progress that has been made during the past year for each of the three tasks.

Not Available

1993-01-01

297

Children and Clinical Studies  

MedlinePLUS Videos and Cool Tools

... for screen reader users > A documentary video for parents about enrolling their child in a clinical study. ... devices specific to children. NEW VIDEO! Messages for Parents and Caregivers Pediatric clinician-researchers, doctors, and nurses ...

298

NCCCP: Comparative Case Studies  

Cancer.gov

For the case studies, RTI will conduct site visits during each of the three years of program implementation to obtain in-depth information about aspects of each program's design, development, and implementation.

299

Studies in Aeolian geology  

NASA Technical Reports Server (NTRS)

The objective of the research was to assess the significance of aeolian (windblown) processes in the evolution of planetary surfaces. The approach was to use wind tunnel simulations, field studies of possible analogs, and analyses of spacecraft data.

Greeley, Ronald

1988-01-01

300

Wilson Cycle studies  

NASA Technical Reports Server (NTRS)

Regional lineaments in continental evolution were studied. It was concluded that lineaments within continents are attributed to a small number of processes of continent formation and modification, but interactions among these processes may produce complex patterns.

Burke, Kevin

1987-01-01

301

MULTIPLE CONTAMINANTS CASE STUDIES  

EPA Science Inventory

The presentation provides information taken from the arsenic demonstration program projects that have treatment systems removing multiply contaminants from drinking water. The case studies sited in the presentation consist of projects that have arsenic along with either nitrate, ...

302

Jewish studies 2012 Catalog  

E-print Network

. . . . . . . . . . . . . . . . . . . . . . . . . . . 12­14 israeli and Middle east studies . . . . . . . . . . . . . . . . . . . . . . . . 15­17 Jewish for course adoption, please supply us with the same information and payment at a 20% discount. (Postage

Baskaran, Mark

303

Advanced planetary studies  

NASA Technical Reports Server (NTRS)

Study concepts and planning analyses programs for NASA's solar system exploration are summarized. Data cover manpower/cost estimation research, Jupiter orbiter lifetime analysis, error/control analysis of penetrator deployment at the moon and Mercury, and advanced planning activities.

1975-01-01

304

Study Rates Migraine Medications  

MedlinePLUS

... on this page, please enable JavaScript. Study Rates Migraine Medications Findings will be basis of new guidelines ... Preidt Tuesday, January 20, 2015 Related MedlinePlus Pages Migraine Pain Relievers TUESDAY, Jan. 20, 2015 (HealthDay News) -- ...

305

Graduate Studies Construction Engineering  

E-print Network

funded by the National Science Foundation (NSF), Construction Industry Institute (CII), Georgia engineering, building construction, and industrial and systems engineering. SELECTED COURSES · ConstructionGraduate Studies Construction Engineering CONSTRUCTION ENGINEERING The construction engineering

Jacobs, Laurence J.

306

Spring 2010 Global Studies  

E-print Network

are required to complete a pre-departure and in- country on-line "Study Abroad Experience" course to see what effect the new healthcare reform will have on the US. Brian Rosenberg Junior, Accounting/Marketing

Suzuki, Masatsugu

307

ENVIRONMENTAL STUDIES CURRICULUM COMMITTEE  

E-print Network

ENVIRONMENTAL STUDIES CURRICULUM COMMITTEE: Susan Clayton (Psychology), Chair Matthew Mariola and human behavior affect fundamental ecological processes, what political and psychological tactics may problems. They should also understand their own roles within the human-environment relationship

Wilson, Mark A.

308

Earth study from space  

NASA Technical Reports Server (NTRS)

The significance that space studies are making to all Earth sciences in the areas of geography, geodesy, cartography, geology, meteorology, oceanology, agronomy, and ecology is discussed. It is predicted that cosmonautics will result in a revolution in science and technology.

Sidorenko, A. V.

1981-01-01

309

Undergrad Study in Mathematics  

E-print Network

Who are the Math Professors? ... Are there Math scholarships available? ... To determine your plan of study, you should consult with your advisor. ... for undergraduates to engage in research projects under the guidance of mathematics faculty.

310

HYDROGEOLOGIC CASE STUDIES  

EPA Science Inventory

Hydrogeology is the foundation of subsurface site characterization for evaluations of monitored natural attenuation (MNA). Three case studies are presented. Examples of the potentially detrimental effects of drilling additives on ground-water samples from monitoring wells are d...

311

LANL Studies Earth's Magnetosphere  

ScienceCinema

A new 3-D supercomputer model presents a new theory of how magnetic reconnection works in high-temperature plasmas. This Los Alamos National Laboratory research supports an upcoming NASA mission to study Earth's magnetosphere in greater detail than ever.

Daughton, Bill

2014-08-12

312

ADVANCED CUTTINGS TRANSPORT STUDY  

SciTech Connect

This report includes a review of the progress made in ACTF Flow Loop development and research during 90 days pre-award period (May 15-July 14, 1999) and the following three months after the project approval date (July15-October 15, 1999) The report presents information on the following specific subjects; (a) Progress in Advanced Cuttings Transport Facility design and development, (b) Progress report on the research project ''Study of Flow of Synthetic Drilling Fluids Under Elevated Pressure and Temperature Conditions'', (c) Progress report on the research project ''Study of Cuttings Transport with Foam Under LPAT Conditions (Joint Project with TUDRP)'', (d) Progress report on the research project ''Study of Cuttings Transport with Aerated Muds Under LPAT Conditions (Joint Project with TUDRP)'', (e) Progress report on the research project ''Study of Foam Flow Behavior Under EPET Conditions'', (f) Progress report on the instrumentation tasks (Tasks 11 and 12) (g) Activities towards technology transfer and developing contacts with oil and service company members.

Ergun Kuru; Stefan Miska; Nicholas Takach; Kaveh Ashenayi; Gerald Kane; Len Volk; Mark Pickell; Evren Ozbayoglu; Barkim Demirdal; Paco Vieira; Affonso Lourenco

1999-10-15

313

Studying Sea Otters  

USGS Multimedia Gallery

Sea otter researcher Michelle Staedler, of the Monterey Bay Aquarium, records sea otter behavior in her logbook as part of a study with the USGS and the University of California at Santa Cruz on sea otter behavior. ...

314

Sleep studies (image)  

MedlinePLUS

During a sleep study the sleep cycles and stages of sleep are monitored. Electrodes are placed to monitor continuous recordings of brain waves, electrical activity of muscles, eye movement, respiratory ...

315

Genetic and Molecular Studies  

Cancer.gov

DCEG strives to understand the interplay of molecular and genetic effects and radiation on cancer etiology. This type of work involves biological samples and high-quality dosimetry or other exposure assessment.Examples of such studies include:Childhood

316

Agricultural Health Study  

Cancer.gov

A fact sheet about the Agricultural Heath Study, begun In 1993 by scientists from the National Cancer Institute, the National Institute of Environmental Health Sciences, and the U.S. Environmental Protection Agency.

317

Social Studies in Brazil.  

ERIC Educational Resources Information Center

Discusses the role of social studies in transmitting the cultural heritage of Brazil. Includes descriptions of Brazilian culture and the educational structure. Journal availability: see SO 506 831. (AV)

Searles, John E.

1979-01-01

318

Tethered gravity laboratories study  

NASA Technical Reports Server (NTRS)

Variable Gravity Laboratory studies are discussed. The following subject areas are covered: (1) conceptual design and engineering analysis; (2) control strategies (fast crawling maneuvers, main perturbations and their effect upon the acceleration level); and (3) technology requirements.

Lucchetti, F.

1989-01-01

319

Studying Eco Climatic Domains  

NSDL National Science Digital Library

Activity is a Project BudBurst/National Ecological Observatory Network (NEON) exploration of eco-climactic domains, as defined by NEON, by investigating characteristics of a specific domain and studying two representative plants in that domain.

NEON

320

Political Studies Review  

NSDL National Science Digital Library

Sponsored by the Political Studies Association, the Political Studies Review was designed to �develop and promote the study of politics.� In particular, the editors of the Political Studies Review strive to create a space in which �new and exciting approaches to reviewing the discipline� of political science arise. The site is a great source for anyone interested in politics and is the leading source for political science book reviews in English. New reviews are regularly updated on recent materials. Not only does the site provide means to update your knowledge of recent political literature, but it is also useful to those considering publishing, as the editors consider a wide array of opinions and ideas.

Festenstein, Matthew

321

Online Study Guides  

NSDL National Science Digital Library

This site features study guides prepared by English Professor Paul Brians of Washington State University for his classes, but available free of charge to Web users, provided they credit the author. The site offers study guides to an extensive library of works, including texts in the fields of science fiction, world history, eighteenth and nineteenth century European classics, Renaissance and World Literature, and the Bible. The study guides not only provide detailed summaries and analyses of the texts, but helpful glossaries of vocabulary and allusions, related Web links, and explanations of key cultural concepts. All together, there are study guides for about 75 texts as well as useful guides to such things as Misconceptions, Confusions, and Conflicts Concerning Socialism, Communism, and Capitalism; and French Impressionist painting.

Brians, Paul.

322

Rotorcraft convertible engine study  

NASA Technical Reports Server (NTRS)

The objective of the Rotorcraft Convertible Engine Study was to define future research and technology effort required for commercial development by 1988 of convertible fan/shaft gas turbine engines for unconventional rotorcraft transports. Two rotorcraft and their respective missions were defined: a Fold Tilt Rotor aircraft and an Advancing Blade Concept (ABC) rotorcraft. Sensitivity studies were conducted with these rotorcraft to determine parametrically the influence of propulsion characteristics on aircraft size, mission fuel requirements, and direct operating costs (DOC). The two rotorcraft were flown with conventional propulsion systems (separate lift/cruise engines) and with convertible propulsion systems to determine the benefits to be derived from convertible engines. Trade-off studies were conducted to determine the optimum engine cycle and staging arrangement for a convertible engine. Advanced technology options applicable to convertible engines were studied. Research and technology programs were identified which would ensure technology readiness for commercial development of convertible engines by 1988.

Gill, J. C.; Earle, R. V.; Mar, H. M.

1982-01-01

323

LANL Studies Earth's Magnetosphere  

SciTech Connect

A new 3-D supercomputer model presents a new theory of how magnetic reconnection works in high-temperature plasmas. This Los Alamos National Laboratory research supports an upcoming NASA mission to study Earth's magnetosphere in greater detail than ever.

Daughton, Bill

2011-04-15

324

Accelerator research studies  

SciTech Connect

The Accelerator Research Studies program at the University of Maryland, sponsored by the Department of Energy under grant number DE-FG05-91ER40642, is currently in the first year of a three-year funding cycle. The program consists of the following three tasks: TASK A, Study of Transport and Longitudinal Compression of Intense, High-Brightness Beams, TASK B, Study of Collective Ion Acceleration by Intense Electron Beams and Pseudospark Produced High Brightness Electron Beams; TASK C, Study of a Gyroklystron High-power Microwave Source for Linear Colliders. In this report we document the progress that has been made during the past year for each of the three tasks.

Not Available

1992-01-01

325

IRD dropout study  

NASA Technical Reports Server (NTRS)

This final report describes work performed by SRS Technologies for the NASA Marshall Space Flight Center under Contract NAS8-39077, entitled 'Integrated Receiver-Decoder Dropout Study'. The purpose of the study was to determine causes of signal fading effects on ultra-high-frequency (UHF) range safety transmissions to the Space Shuttle during flyout. Of particular interest were deep fades observed at the External Tank (ET) Integrated Receiver-Decoder (IRD) during the flyout interval between solid rocket booster separation and ET separation. Analytical and simulation methods were employed in this study to assess observations captured in flight telemetry data records. Conclusions based on the study are presented in this report, and recommendations are given for future experimental validation of the results.

Yalowitz, Jeffrey S.; Schroer, Michael A.; Dickson, John E., Jr.

1992-01-01

326

Studies of talent markets  

E-print Network

This thesis consists of three studies of labor markets where differences in talent are associated with very large differences in income. The unifying theoretical feature is the view that the analysis of such labor markets ...

Terviö, Marko

2003-01-01

327

Habitability study shuttle orbiter  

NASA Technical Reports Server (NTRS)

Studies of the habitability of the space shuttle orbiter are briefly summarized. Selected illustrations and descriptions are presented for: crew compartment, hygiene facilities, food system and galley, and storage systems.

1972-01-01

328

Degree Requirements Liberal Studies  

E-print Network

BST 221, 351-353, 421, 424-427), Communication Studies, Conflict Resolution, English/Writing, Foreign the International Experience (also LING 471) GEOG 363 WIC: Geography of Africa PH 378U WIC: Science Through Science

329

Applied Research Study  

NASA Technical Reports Server (NTRS)

The purpose of this project was to study the feasibility of reusing major components of a software system that had been used to control the operations of a spacecraft launched in the 1980s. The study was done in the context of a ground data processing system that was to be rehosted from a large mainframe to an inexpensive workstation. The study concluded that a systematic approach using inexpensive tools could aid in the reengineering process by identifying a set of certified reusable components. The study also developed procedures for determining duplicate versions of software, which were created because of inadequate naming conventions. Such procedures reduced reengineering costs by approximately 19.4 percent.

Leach, Ronald J.

1997-01-01

330

Comparative Packaging Study  

NASA Technical Reports Server (NTRS)

This viewgraph presentation describes a comparative packaging study for use on long duration space missions. The topics include: 1) Purpose; 2) Deliverables; 3) Food Sample Selection; 4) Experimental Design Matrix; 5) Permeation Rate Comparison; and 6) Packaging Material Information.

Perchonok, Michele; Antonini, David

2008-01-01

331

LIMB PROCESS DEVELOPMENT STUDIES  

EPA Science Inventory

The report covers basic and applied studies concerned with three Limestone Injection Multistage Burner (LIMB) process objectives: (1) avoiding degradation of collection efficiency in the electrostatic precipitator (ESP) during LIMB, (2) achieving satisfactory sulfur dioxide (SO2)...

332

Healthcare Management & Insurance Studies  

E-print Network

Healthcare Management & Insurance Studies MINOR IN The Health Care field is a growth industry 06269 Required · Introduction to Healthcare Management · Health Care Industry Analysis Choose three courses from the below: · Health and Social Insurance · Healthcare Financial and Human Resource Management

Alpay, S. Pamir

333

Operator Certification Study Guide.  

ERIC Educational Resources Information Center

This study guide contains typical questions and answers that all levels of water treatment plant operators might expect to find on a certification examination. The manual covers the basic sciences, treatment techniques, testing procedures, and federal legislation. (Author/SB)

American Water Works Association, Denver, CO.

334

Why Indigenous Nations Studies?  

E-print Network

Why Indigenous Nations Studies? Robert B. Porter Michael J. Yellow Bird One of the first of several committee assignments we received after joining the faculty as new untenured professors was an appointment to a university task force charged... statement says what it says and why we decided to call the program "Indigenous Nations Studies." 71 72 Robert B. Porter and Michael J. Yellow Bird The Program Mission Statement Organizational mission statements are quite often so ambitious...

Porter, Robert; Yellow Bird, Michael

2000-03-01

335

Salary Study, 1999.  

ERIC Educational Resources Information Center

This report details a study of trends in the salaries of Chief Executive Officers (CEOs) and other personnel at member agencies of the Child Welfare League of America (CWLA). Responding to the study's mail survey were 437 out of 977 CEOs (44.7 percent) and 337 out of 825 CWLA member agencies (40.8 percent). The bulk of the report is comprised of…

Feagans, Laura

336

Power subsystem automation study  

NASA Technical Reports Server (NTRS)

The purpose of the phase 2 of the power subsystem automation study was to demonstrate the feasibility of using computer software to manage an aspect of the electrical power subsystem on a space station. The state of the art in expert systems software was investigated in this study. This effort resulted in the demonstration of prototype expert system software for managing one aspect of a simulated space station power subsystem.

Tietz, J. C.; Sewy, D.; Pickering, C.; Sauers, R.

1984-01-01

337

Robotics vehicle mobility study  

Microsoft Academic Search

A nine-month study was conducted under the direction of Tank-Automotive Research, Development and Engineering Center (TARDEC) in Warren, MI. to determine the best platform design for inherent all-terrain mobility of an unmanned robotic vehicle in the 15000-2500 lb. range. Reference platforms were the DEMO III 4x4 and the Utah State University 6x6 with omni-directional wheels. The study systematically developed desired

Kurt H. Ansorge; James E. Pond

2000-01-01

338

NASA Propagation Studies Website  

NASA Technical Reports Server (NTRS)

The NASA propagation studies objective is to enable the development of new commercial satellite communication systems and services by providing timely data and models about propagation of satellite radio signals through the intervening environment and to support NASA missions. In partnership with industry and academia, the program leverages unique NASA assets (currently Advanced Communications Technology Satellite) to obtain propagation data. The findings of the study are disseminated through referred journals, NASA reference publications, workshops, electronic media, and direct interface with industry.

Angkasa, Krisjani S.

1996-01-01

339

Banner Ad Placement Study  

NSDL National Science Digital Library

Webreference.com (discussed in the April 19, 1996 Scout Report) has recently added this interesting and thought-provoking resource to its site. The resource presents the results of a study of banner ad placement at webreference.com, conducted between March 25 and April 15, 1997 by three University of Michigan School of Business Administration students. The study concludes that changes in placement of banner ads affects "click-through" rates.

Doyle, Kim.

340

Nanoindentation study of nanofibers  

NASA Astrophysics Data System (ADS)

Nanoindentation study of a single poly(L-lactic acid) nanofiber produced by the phase separation method was performed using an atomic force microscope (AFM) cantilever tip. Issues concerning the use of AFM for nanoindentation of polymer nanofibers were discussed. The Hertz theory of contact mechanics was used to analyze the indentation results. It was found that the elastic modulus was comparable to that obtained from the nanoscale three-point bend test done in our previous study, after roughness correction was made.

Tan, E. P. S.; Lim, C. T.

2005-09-01

341

Constellation Commodities Studies Summary  

NASA Technical Reports Server (NTRS)

Constellation program was NASA's long-term program for space exploration. The goal of the commodities studies was to solicit industry expertise in production, storage, and transportation required for future use and to improve efficiency and life cycle cost over legacy methods. Objectives were to consolidate KSC, CCAFS and other requirements; extract available industry expertise; identify commercial opportunities; and establish synergy with State of Florida partnerships. Study results are reviewed.

Dirschka, Eric

2011-01-01

342

The Agricultural Health Study.  

PubMed Central

The Agricultural Health Study, a large prospective cohort study has been initiated in North Carolina and Iowa. The objectives of this study are to: 1) identify and quantify cancer risks among men, women, whites, and minorities associated with direct exposure to pesticides and other agricultural agents; 2) evaluate noncancer health risks including neurotoxicity reproductive effects, immunologic effects, nonmalignant respiratory disease, kidney disease, and growth and development among children; 3) evaluate disease risks among spouses and children of farmers that may arise from direct contact with pesticides and agricultural chemicals used in the home lawns and gardens, and from indirect contact, such as spray drift, laundering work clothes, or contaminated food or water; 4) assess current and past occupational and nonoccupational agricultural exposures using periodic interviews and environmental and biologic monitoring; 5) study the relationship between agricultural exposures, biomarkers of exposure, biologic effect, and genetic susceptibility factors relevant to carcinogenesis; and 6) identify and quantify cancer and other disease risks associated with lifestyle factors such as diet, cooking practices, physical activity, smoking and alcohol consumption, and hair dye use. In the first year of a 3-year enrollment period, 26,235 people have been enrolled in the study, including 19,776 registered pesticide applicators and 6,459 spouses of registered farmer applicators. It is estimated that when the total cohort is assembled in 1997 it will include approximately 75,000 adult study subjects. Farmers, the largest group of registered pesticide applicators comprise 77% of the target population enrolled in the study. This experience compares favorably with enrollment rates of previous prospective studies. Images Figure 1. Figure 2. Figure 3. Figure 4. PMID:8732939

Alavanja, M C; Sandler, D P; McMaster, S B; Zahm, S H; McDonnell, C J; Lynch, C F; Pennybacker, M; Rothman, N; Dosemeci, M; Bond, A E; Blair, A

1996-01-01

343

Advanced planetary studies  

NASA Technical Reports Server (NTRS)

Results of planetary advanced studies and planning support provided by Science Applications, Inc. staff members to Earth and Planetary Exploration Division, OSSA/NASA, for the period 1 February 1981 to 30 April 1982 are summarized. The scope of analyses includes cost estimation, planetary missions performance, solar system exploration committee support, Mars program planning, Galilean satellite mission concepts, and advanced propulsion data base. The work covers 80 man-months of research. Study reports and related publications are included in a bibliography section.

1982-01-01

344

Trajectory Code Studies, 1987  

SciTech Connect

The trajectory code TRAJ has been used extensively to study nonimmersed foilless electron diodes. The basic goal of the research is to design low-emittance injectors for electron linacs and propagation experiments. Systems studied during 1987 include Delphi, Recirc, and Troll. We also discuss a partly successful attempt to extend the same techniques to high currents (tens of kA). 7 refs., 30 figs.

Poukey, J.W.

1988-01-01

345

PFBC system studies  

SciTech Connect

System studies of PFBC systems are summarized in this paper. These studies include: thermal efficiency; NO{sub x} stochastic analysis; dynamic modeling; scoping studies; and hazardous air pollutant (HAP) studies. These studies are being used for various reasons: to validate the economic and environmental benefits that this technology offers the country, to identify issues associated with the commercialization of PFBC technology, and to help the DOE and its industrial partners focus on those RD&D activities which produce the biggest bang for the buck, an increasingly important goal in the present climate of increasingly tight Federal and corporate budgets. This year, the conclusion that NO{sub x} generation in the solids combustor is the most important factor in determining NO{sub x} production in an uncontrolled system was of particular significance. The initial assessment of HAP`s, showing a possible reduction in HAPs emissions if the barrier filter is operated below 600 C in a first-generation PFBC, was the first time this type of data was produced on the ability of PFBC systems to be a low HAP`s emission technology. Work will continue to improve these analytic tools used in these system studies useful for both DOE and its industrial partners.

Reed, M.E.

1994-10-01

346

Study Abroad Programs and Requirements Study abroad programs  

E-print Network

Study Abroad ­ Programs and Requirements Study abroad programs A number of study abroad of Engineering takes an annual study abroad trip to Greece (ENGG 407 and ENGG 393, a complementary studies option still study at another institution without participating in an exchange program or a study abroad

Calgary, University of

347

African-American Studies 46. . . . . . . . . . . American Studies 48. . . . . . . . . . . . . . . . . .  

E-print Network

African-American Studies 46. . . . . . . . . . . American Studies 48. . . . . . . . . . . . . . . . . . . . . . . . . . History 182. . . . . . . . . . . . . . . . . . . . . . . . . . History of Science 202. . . . . . . . . . . . . . . . . . . . . . . . . Women's and Gender Studies 310. . . . . . . Critical Reasoning and Analytical Skills (CRAAS) Courses 316

Aalberts, Daniel P.

348

The Millennium Cohort Study.  

PubMed

The Millennium Cohort Study is the latest in the line of British birth cohort studies. MCS resembles its predecessors which follow people born in 1946, 1958 and 1970 in the intention to become multi-purpose longitudinal data resource charting many aspects of individual's lives over time. The families of a sample of around 20,000 babies are being interviewed during 2001-02, when eligible babies reach 9 months, to establish the conditions from which they set out in life. The survey contrasts with the previous cohort studies in various ways. Instead of taking all births in one week, the sample of births is spread over a year; the births are from a selection of electoral wards, thereby enabling eventual analysis by neighbourhood characteristics; it also over samples children living in deprived areas, wards with high ethnic minority populations and samples have been boosted in Scotland, Wales and Northern Ireland. The latter UK country has not been covered by the other studies. It interviews fathers as well as mothers, and given that its initial funding comes via the ESRC, puts a greater emphasis on socio-economic data than in early parts of the other studies. MCS has been enhanced by additional Government funding. The research team, based at the Institute of Education, aims to deposit a multi-purpose dataset for public use at the ESRC data Archive in the Spring of 2003. PMID:12152184

Smith, Kate; Joshi, Heather

2002-01-01

349

ADVANCED CUTTINGS TRANSPORT STUDY  

SciTech Connect

This is the second quarterly progress report for Year 2 of the ACTS project. It includes a review of progress made in Flow Loop development and research during the period of time between Oct 1, 2000 and December 31, 2000. This report presents a review of progress on the following specific tasks: (a) Design and development of an Advanced Cuttings Transport Facility (Task 2: Addition of a foam generation and breaker system), (b) Research project (Task 6): ''Study of Cuttings Transport with Foam Under LPAT Conditions (Joint Project with TUDRP)'', (c) Research project (Task 7): ''Study of Cuttings Transport with Aerated Muds Under LPAT Conditions (Joint Project with TUDRP)'', (d) Research project (Task 8): ''Study of Flow of Synthetic Drilling Fluids Under Elevated Pressure and Temperature Conditions'', (e) Research project (Task 9): ''Study of Foam Flow Behavior Under EPET Conditions'', (f) Research project (Task 10): ''Study of Cuttings Transport with Aerated Mud Under Elevated Pressure and Temperature Conditions'', (g) Research on instrumentation tasks to measure: Cuttings concentration and distribution in a flowing slurry (Task 11), and Foam properties while transporting cuttings. (Task 12), (h) Development of a Safety program for the ACTS Flow Loop. Progress on a comprehensive safety review of all flow-loop components and operational procedures. (Task 1S). (i) Activities towards technology transfer and developing contacts with Petroleum and service company members, and increasing the number of JIP members. The tasks Completed During This Quarter are Task 7 and Task 8.

Troy Reed; Stefan Miska; Nicholas Takach; Kaveh Ashenayi; Gerald Kane; Mark Pickell; Len Volk; Mike Volk; Barkim Demirdal; Affonso Lourenco; Evren Ozbayoglu; Paco Vieira; Lei Zhou

2000-01-30

350

Wilson Cycle studies  

NASA Technical Reports Server (NTRS)

The main activity relating to the study during this half year was a three week field trip to study Chinese sedimentary basins (June 10 to July 3, 1986) at no cost to the project. This study, while of a reconnaissance character, permitted progress in understanding how the processes of island arc-collision and micro-continental collision operated during the Paleozoic in far western China (especially the Junggar and Tarim basins and in the intervening Tien Shan Mountains). These effects of the continuing collision of India and Asia on the area were also studied. Most specifically, these result in the elevation of the Tien Shan to more than 4 km above sea level and the depression of Turfan to move 150m below sea level. Both thrusting and large-scale strike-slip motion are important in producing these elevation changes. Some effort during the half year was also devoted to the study of greenstone-belts in terms of the Wilson Cycle.

Burke, Kevin

1987-01-01

351

Partial gravity habitat study  

NASA Technical Reports Server (NTRS)

The purpose of this study is to investigate comprehensive design requirements associated with designing habitats for humans in a partial gravity environment, then to apply them to a lunar base design. Other potential sites for application include planetary surfaces such as Mars, variable-gravity research facilities, and a rotating spacecraft. Design requirements for partial gravity environments include locomotion changes in less than normal earth gravity; facility design issues, such as interior configuration, module diameter, and geometry; and volumetric requirements based on the previous as well as psychological issues involved in prolonged isolation. For application to a lunar base, it is necessary to study the exterior architecture and configuration to insure optimum circulation patterns while providing dual egress; radiation protection issues are addressed to provide a safe and healthy environment for the crew; and finally, the overall site is studied to locate all associated facilities in context with the habitat. Mission planning is not the purpose of this study; therefore, a Lockheed scenario is used as an outline for the lunar base application, which is then modified to meet the project needs. The goal of this report is to formulate facts on human reactions to partial gravity environments, derive design requirements based on these facts, and apply the requirements to a partial gravity situation which, for this study, was a lunar base.

Capps, Stephen; Lorandos, Jason; Akhidime, Eval; Bunch, Michael; Lund, Denise; Moore, Nathan; Murakawa, Kiosuke

1989-01-01

352

Cosmos-1989 immunology studies  

NASA Technical Reports Server (NTRS)

Evidence from both human and rodent studies has indicated that alterations in immunological parameters occur after space flight. The number of flight experiments has been small, and the full breadth of immunological alterations occurring after space flight remains to be established. Among the major effects on immune responses after space flight that have been reported are: alterations in lymphocyte blastogenesis and natural killer cell activity, alterations in production of cytokines, changes in leukocyte sub-population distribution, and decreases in the ability in the ability of bone marrow cells to respond to colony stimulating factors. Changes have been reported in immunological parameters of both humans and rodents. The significance of these alterations in relation to resistance to infection remains to be established. The current study involved a determination of the effects of flight on Cosmos mission 2044 on leukocyte subset distribution and the sensitivity of bone marrow cells to colony stimulating factor-GM. A parallel study with antiorthostatic suspension was also carried out. The study involved repetition and expansion of studies carried out on Cosmos 1887.

Sonnenfeld, Gerald

1991-01-01

353

Ventilation technologies scoping study  

SciTech Connect

This document presents the findings of a scoping study commissioned by the Public Interest Energy Research (PIER) program of the California Energy Commission to determine what research is necessary to develop new residential ventilation requirements for California. This study is one of three companion efforts needed to complete the job of determining the needs of California, determining residential ventilation requirements, and determining appropriate ventilation technologies to meet these needs and requirements in an energy efficient manner. Rather than providing research results, this scoping study identifies important research questions along with the level of effort necessary to address these questions and the costs, risks, and benefits of pursuing alternative research questions. In approaching these questions and level of effort, feasibility and timing were important considerations. The Commission has specified Summer 2005 as the latest date for completing this research in time to update the 2008 version of California's Energy Code (Title 24).

Walker, Iain S.; Sherman, Max H.

2003-09-30

354

STUDIES ON EXPERIMENTAL HYPERTENSION  

PubMed Central

1. Extraction of finely ground fresh hog kidney with distilled water adjusted to pH 7.8 with sodium hydroxide, followed by successive treatment, as described, with trichloroacetic acid and acetone, gives renin in good yield of a purity suitable for physiological studies and a good starting material for further purification. It contains 15 dog units per mg. N. 2. Further successive purification of this material with ethyl alcohol and ammonium sulfate gives a preparation containing 130 dog units per mg. N. The purest preparation hitherto reported (15) contained 16.0 to 20.8 units per mg. N. Preliminary Tiselius electrophoresis studies suggest homogeneity, but further studies to establish purity are in progress. 3. The properties of the most purified renin indicate that it is a protein. Its chemical and physiological properties correspond to those of the material in crude renal extract which induces an elevation of blood pressure when it is injected intravenously. PMID:19871310

Katz, Yale J.; Goldblatt, Harry

1943-01-01

355

Current Automotive Holometry Studies  

NASA Astrophysics Data System (ADS)

Holometry studies of automotive body and powertrain components have become a very useful high resolution test methodology to knowledgeable Ford engineering personnel. Current examples of studies that represent the static or dynamic operational conditions of the automotive test component are presented. Continuous wave laser holometry, computer aided holometry (CAH) and pulsed laser holometry were the holometric techniques used to study the following subjects: (1) body in prime (BIP) vibration modes, (2) transmission flexplate stud-torque converter deformation due to engine torque pulses, (3) engine cylinder head and camshaft support structure deformation due to cylinder pressure and (4) engine connecting rod/cap lift-off. Static and dynamic component loading and laboratory techniques required to produce usable and valid test results are discussed along with possible conclusions for the engineering concerns.

Marchi, Mitchell M.; Snyder, D. S.

1990-04-01

356

Seal design alternatives study  

SciTech Connect

This report presents the results from a study of various sealing alternatives for the WIPP sealing system. Overall, the sealing system has the purpose of reducing to the extent possible the potential for fluids (either gas or liquid) from entering or leaving the repository. The sealing system is divided into three subsystems: drift and panel seals within the repository horizon, shaft seals in each of the four shafts, and borehole seals. Alternatives to the baseline configuration for the WIPP seal system design included evaluating different geometries and schedules for seal component installations and the use of different materials for seal components. Order-of-magnitude costs for the various alternatives were prepared as part of the study. Firm recommendations are not presented, but the advantages and disadvantages of the alternatives are discussed. Technical information deficiencies are identified and studies are outlined which can provide required information.

Van Sambeek, L.L. [RE/SPEC Inc., Rapid City, SD (US); Luo, D.D.; Lin, M.S.; Ostrowski, W.; Oyenuga, D. [Parsons Brinckerhoff Quade & Douglas, Inc., San Francisco, CA (US)

1993-06-01

357

LAWS hurricane studies  

NASA Technical Reports Server (NTRS)

The Laser Atmospheric Wind Sounder (LAWS) has recently been deselected from the Earth Observing System (EOS). A broad range of orbital altitudes and laser power are being considered for future wind lidar missions. As a result, as was anticipated in the proposed work, it may be impossible to meaningfully study tropical cyclones with lidar wind data because data coverage (i.e., swath width) is insufficient. Research on this grant has focused on how to maximize the benefits of a wind lidar regardless of the choice of platform or laser. Our studies have shown that major unsolved problems in tropical meteorology relate to the structure, dynamics, and role in tropical cyclogenesis of 'easterly waves'. These disturbances exist almost everywhere in the global subtropics. Results are described that focus upon easterly wave impacts on eastern Pacific tropical cyclogenesis. The availability of wind lidar data would create tremendous opportunities for the study of these waves and their role in the general circulation.

Molinari, John

1995-01-01

358

Pathology Case Study: Sepsis  

NSDL National Science Digital Library

This is a case study presented by the University of Pittsburgh Department of Pathology where a 74 year old man with a history of diabetes mellitus, coronary artery disease, inferior wall myocardial infarction, peripheral vascular disease, hypertension, and hypercholesterolemia. He was admitted for a left femoral-popliteal bypass graft. The case study provides both gross and microscopic descriptions along with pertinent laboratory studies in order to allow the user the opportunity to diagnose the patient. Clicking on the final diagnosis link will provide users with a discussion of the actual diagnosis along with important learning points as well as a list of references. This is an excellent resource for students in health sciences to familiarize themselves with using patient history and laboratory results to develop a diagnosis. It is also a helpful site for educators to use to introduce or test student learning in pathology and clinical microbiology.

Callahan, Debra L.

359

Cosmos: 1989 immunology studies  

NASA Technical Reports Server (NTRS)

The effects of flight on Cosmos mission 2044 on leukocyte subset distribution and the sensitivity of bone marrow cells to colony stimulating factor-GM were determined. A parallel study with antiorthostatic suspension was also carried out. The study involved repetition and expansion of studies performed on Cosmos 1887. Spleen and bone marrow cells were obtained from flown, vivarium control, synchronous control, and suspended rats. The cells were stained with a series of monoclonal antibodies directed against rat leukocyte cell surface antigens. Control cells were stained with a monoclonal antibody directed against an irrelevant species or were unstained. Cells were then analyzed for fluorescence using a FACSCAN flow cytometer. Bone marrow cells were placed in culture with GM-CSF in McCoy's 5a medium and incubated for 5 days. Cultures were then evaluated for the number of colonies of 50 cells or greater.

Sonnenfeld, Gerald

1991-01-01

360

Iron studies in hemophilia  

SciTech Connect

Although iron deficiency is not recognized as a usual complication of hemophilia, we questioned whether intermittent occult loss of blood in urine or stool might predispose hemophiliacs to chronic iron deficiency. Seven men with factor VII and one with factor IX deficiency were studied. Blood studied, bone marrow aspirates, urine and stool samples, and ferrokinetics with total-body counting up to five months were examined. These data showed no excessive loss of blood during the study period; however, marrow iron stores were decidedly decreased, being absent in four subjects. We suggest that in some hemophiliacs, iron deposits in tissues such as synovial membranes may form a high proportion of the body's total iron stores.

Lottenberg, R.; Kitchens, C.S.; Roessler, G.S.; Noyes, W.D.

1981-12-01

361

Salt studies: Conclusions  

NASA Astrophysics Data System (ADS)

This report represents the conclusion of the compressed air energy storage (CAES) program in salt. It includes a brief background of salt cavity studies and utilization for CAES, the focuses on long-term stability criteria for solution mined salt cavities. Summary statements are made on some of the more important criteria and their significance for operational peaking-power plants utilizing salt cavities for CAES reservoirs. The concluding section of this report incorporates a discussion of the future for CAES in U.S. salt deposits. This discussion is based mainly on technical considerations, since they have been the main consideration in this particular study. Obviously, economic analyses will dominate decisions by utilities on construction schedules for any technically feasible CAES study.

Thoms, R. L.; Gehle, R. M.

1982-12-01

362

Hardrock studies: Conclusions  

NASA Astrophysics Data System (ADS)

The objective of the hard rock reservoir stability studies project was to develop geotechnical criteria for the design and stability of caverns in hard rock formations that would be used to store compressed air for utility load leveling operations. To develop these criteria, a sequence of studies was formulated including state-of-the-art assessment, numerical model development, and an experimental program. This sequence was started in FY 1978 and completed FY 1981. During FY 1982, final stability criteria and guidelines were assembled into a report that integrated the geotechnical data base obtained from the sequence of hard rock studies. This document provides a resource that can be used to address concerns regarding long-term cavern stability by those who are responsible for CAES development.

Fossum, A. F.

1982-12-01

363

Parylene C Aging Studies.  

SciTech Connect

Parylene C is used in a device because of its conformable deposition and other advantages. Techniques to study Parylene C aging were developed, and %22lessons learned%22 that could be utilized for future studies are the result of this initial study. Differential Scanning Calorimetry yielded temperature ranges for Parylene C aging as well as post-deposition treatment. Post-deposition techniques are suggested to improve Parylene C performance. Sample preparation was critical to aging regimen. Short-term (~40 days) aging experiments with free standing and ceramic-supported Parylene C films highlighted %22lessons learned%22 which stressed further investigations in order to refine sample preparation (film thickness, single sided uniform coating, machine versus laser cutting, annealing time, temperature) and testing issues (%22necking%22) for robust accelerated aging of Parylene C.

Achyuthan, Komandoor; Sawyer, Patricia Sue.; Mata, Guillermo Adrian; White II, Gregory Von; Bernstein, Robert

2014-09-01

364

TableofContentsEnvironmentalStudies Table of Contents Environmental Studies  

E-print Network

· Certificate in Environmental Landscape Design . . . . . 351 · Certificate in Community Arts Practice (CAP345 TableofContents­EnvironmentalStudies Table of Contents ­ Environmental Studies Faculty of Environmental Studies . . . . . . . . . . . . . . . . 347 The Bachelor in Environmental Studies

365

Studies in neuroendocrine pharmacology  

NASA Technical Reports Server (NTRS)

The expertise and facilities available within the Medical Sciences Program section on Pharmacology were used along with informational input from various NASA sources to study areas relevant to the manned space effort. Topics discussed include effects of drugs on deprivation-induced fluid consumption, brain biogenic amines, biochemical responses to stressful stimuli, biochemical and behavioral pharmacology of amphetamines, biochemical and pharmacological studies of analogues to biologically active indole compounds, chemical pharmacology: drug metabolism and disposition, toxicology, and chemical methodology. Appendices include a bibliography, and papers submitted for publication or already published.

Maickel, R. P.

1976-01-01

366

Outer planet studies  

NASA Technical Reports Server (NTRS)

The focus is on observational studies of the composition, structure, and variability of planetary, satellite, and cometary atmospheres. The techniques used include spectroscopy, spectrophotometry, and photometric imaging in the spectral region from 3000 A to 5 microns. In addition to carrying out basic research into the origin, evolution, and current state of the solar system, these studies provide ground-truth support for observations of the solar system by NASA's missions, including the Voyager and Galileo Spacecraft, the Hubble Space Telescope, and the proposed Comet Rendezvous Asteroid Flyby (CRAF)-Cassini Mission.

Lutz, Barry L.

1991-01-01

367

Hybrid receiver study  

NASA Technical Reports Server (NTRS)

The results are presented of a 4 month study to design a hybrid analog/digital receiver for outer planet mission probe communication links. The scope of this study includes functional design of the receiver; comparisons between analog and digital processing; hardware tradeoffs for key components including frequency generators, A/D converters, and digital processors; development and simulation of the processing algorithms for acquisition, tracking, and demodulation; and detailed design of the receiver in order to determine its size, weight, power, reliability, and radiation hardness. In addition, an evaluation was made of the receiver's capabilities to perform accurate measurement of signal strength and frequency for radio science missions.

Stone, M. S.; Mcadam, P. L.; Saunders, O. W.

1977-01-01

368

Photothermal degradation studies  

NASA Astrophysics Data System (ADS)

Key reaction intermediates of photooxidation identified and characterized by laser flash Electron Spin Resonance (ESR) spectroscopy were discussed. Effects of temperature and ultraviolet intensity were studied in order to develop meaningful accelerated testing procedures for encapsulant evaluation. In a program to study the failure of Tedlar/ethylene vinyl acetate (EVA)/stainless steel modules, failure modes similar to those observed outdoors in real-time conditions were simulated in accelerated testing. An experimental technique was developed to quantitatively assess the extent of degradation.

Liang, R. H.

1985-06-01

369

Pathology Case Study: Dysphagia  

NSDL National Science Digital Library

The University of Pittsburgh School of Medicine's Department of Pathology has compiled a series of case studies to help both students and instructors. The patient in this particular case is a 64-year-old male with difficulty swallowing anything other than liquids. Patient history and both the gross and microscopic descriptions, which include images, are included in this case study. The contributing doctors provide a detailed discussion of the patientâ??s condition in the â??Final Diagnosisâ? section. Students will find this resource especially helpful, as it provides experience with patient history, lab results, and diagnostics.

Barnes, Leon, 1941-

370

Cryogenic Propellant Densification Study  

NASA Technical Reports Server (NTRS)

Ground and vehicle system requirements are evaluated for the use of densified cryogenic propellants in advanced space transportation systems. Propellants studied were slush and triple point liquid hydrogen, triple point liquid oxygen, and slush and triple point liquid methane. Areas of study included propellant production, storage, transfer, vehicle loading and system requirements definition. A savings of approximately 8.2 x 100,000 Kg can be achieved in single stage to orbit gross liftoff weight for a payload of 29,484 Kg by utilizing densified cryogens in place of normal boiling point propellants.

Ewart, R. O.; Dergance, R. H.

1978-01-01

371

Teaching Social Studies Methods  

NSDL National Science Digital Library

Teaching Social Studies to K-8 students is an engaging and creative process. Children learn best when they are interested and engaged in local and personal history. Connecting historical events to children\\'s lives is a powerful way to develop historical and cultural awareness. In this exercise you will be able to find some national and local resources to help you design and implement Social Studies in your K-8 classrooms. So let\\'s get started! First let\\'s see what kinds of resources are available on the web and other virtual places that are engaging and interesting ...

Darius Kalvaitis

2006-02-17

372

Breakthrough Generations Study  

Cancer.gov

The Breakthrough Generations Study is a long-term cohort study of more than 110,000 women aged 16 years and older from the general population of the United Kingdom. Detailed questionnaire information is gathered at recruitment about factors that might relate to breast cancer risk or protection. Blood samples have been collected from more than 90 percent of cohort members. Follow-up rounds are designed to occur every 2½ years, with the intention to continue to collect data for the next 40 years or longer.

373

[Infertility studies in men].  

PubMed

This study summarizes the results of a questionnaire sent to 312 men involved in a fertility investigation. The answers illustrate the psychological problems linked to the infertile state, and indicate that men are generally well orientated about the extent of the problem. In the majority of cases, the infertile couples first contacted a gynecologist rather than a general practioner or other specialist. In over one third of the cases, this contact occurred within the first 12 months of attempting to achieve a pregnancy. The study implies an increasing negative attitude to donor insemination, and approximately one fifth of the men had at some time consulted fringe medicine. PMID:2042142

Oldereid, N B; Rui, H; Purvis, K

1991-04-20

374

Morphing Terminology Study  

SciTech Connect

This study investigates methods of automatically identifying and characterizing significant transitions in term usage over time. Within scientific literature, the occurrence of terms reflects the use of technologies and techniques as well as the study of specific species and materials. Transitions in terminology usage may be a result of vocabulary standardization or specialization in which terms are replaced with their shorter form. They may also be a result of new applications, combinations, alternatives, or interests that result in the appearance of new or existing terminology in unexpected contexts.

Rose, Stuart J.; Brockman, Fred J.; Hart, Michelle L.; Engel, David W.; Valentine, Nancy B.; Calapristi, Augustin J.

2010-06-28

375

Center for Nonlinear Studies  

NSDL National Science Digital Library

The Los Alamos National Laboratory provides the Center for Nonlinear Studies (CNLS) Website. The goals of the center are "to identify and study fundamental nonlinear phenomena and promote their use in applied research and to stimulate interdisciplinary research and information exchanges inside and outside the laboratory." Research topics include molecular dynamics, patterns in turbulence, stochastic dynamics, combinatorial optimization, and condensed matter, among others. Those interested in supercomputing will want to visit the section dedicated to Avalon, the CNLS supercomputer that is being used for applications ranging from astrophysics to molecular dynamics. Also at the Website, users may access information pertaining to jobs, meetings, talks, and papers.

Center for Nonlinear Studies (Los Alamos National Laboratory).

1999-01-01

376

Studying lightning strikes  

NASA Astrophysics Data System (ADS)

Scientists studying thunderstorms hope that using an “uninhabited aerial vehicle,” or UAV will allow them to overcome speed limitations of conventional aircraft to gain a better understanding of weather data and forecasting.Researchers with the Altus Cumulus Electrification Study (ACES) say that the Altus UAV flies at between 129 and 185 kilometers per hour, slower than conventional aircraft. This should allow the 55-foot wingspan vehicle to provide a longer-duration picture of thunderstorms without putting pilots and airborne researchers at risk during an August field campaign, based out of Naval Air Station Key West in Florida.

Showstack, Randy

377

Concepts: A Pilot Study  

E-print Network

The purpose of this study is to teach nurses to apply a critical thinking framework linking to case studies online. One hundred and twenty nurses will be asked to volunteer. Nurses will be randomly assigned either to an experimental or control group. The experimental group will discuss and apply a critical thinking framework and the control group will not. It is expected that the qualitative themes emerging from the discussions in the experimental groups will reflect the critical thinking framework. It is also expected that the two scoring quantitative measures will be significantly different between the experimental and control group.

Elaine A. Gardner Ph. D

378

Fathead fecundity study  

SciTech Connect

Fathead minnows (Pimephales promelas) are cultured in controlled laboratory settings for use in aquatic toxicity testing. Culturing is done to maintain a continuous supply of organisms of all ages; breeders, juveniles and larvae. This study is designed to determine the age at which peak egg production occurs. Fish are paired, one male to one female, at three to four months of age. Daily egg production is recorded and graphed. The graph of egg production vs. fish age will determine the age at which peak egg production occurs. The results of this study will provide information for more efficient use of lab space and staff, while maximizing egg production.

Barman, M.A.E.; Geis, S.; Repavich, W.; Schappe, K. [State Lab. of Hygiene, Madison, WI (United States)

1995-12-31

379

Spectrophotometric study of asteroids  

NASA Technical Reports Server (NTRS)

Observations of particular faint asteroids of interest, in particular the Trojans, were carried out during an observation run at Kitt Peak National Observatory (1.3 meter telescope) in September 1973, and an attempt was made to study the compositional variation within Hirayama families. A particularly important study was initiated to observe spectrophotometrically certain asteroids which are considered as potential source bodies for meteorites. A program was also undertaken to coordinate the spectrophotometry program with polarimetric and thermal-infrared observation programs being conducted elsewhere.

Chapman, C. R.

1974-01-01

380

DWPF Welder Parametric Study  

SciTech Connect

After being filled with glass, DWPF canistered waste forms will be welded closed using an upset resistance welding process. This final closure weld must be leaktight, and must remain so during extended storage at SRS. As part of the DWPF Startup Test Program, a parametric study (DWPF-WP-24) has been performed to determine a range of welder operating parameters which will produce acceptable welds. The parametric window of acceptable welds defined by this study is 90,000 + 15,000 lb of force, 248,000 + 22,000 amps of current, and 95 + 15 cycles* for the time of application of the current.

Plodinec, M.J.

1998-11-20

381

Impact ionization study  

NASA Technical Reports Server (NTRS)

The impact ionization phenomenon which was observed on certain spacecraft was studied. The phenomenon occurs when a neutral atom, molecule, or ion strikes a surface with sufficient kinetic energy that either the incident neutral or atoms on the surface are ionized, with subsequent escape of ions and/or electrons. The released ions and electrons can interfere with measurements on the spacecraft by confusing interpretation of the data. On the other hand, there is the possibility that the effect could be developed into a diagnostic tool for investigating neutral atmospheric species or for studying physical processes on spacecraft surfaces.

Whipple, E. C., Jr.

1982-01-01

382

Photothermal degradation studies  

NASA Technical Reports Server (NTRS)

Key reaction intermediates of photooxidation identified and characterized by laser flash Electron Spin Resonance (ESR) spectroscopy were discussed. Effects of temperature and ultraviolet intensity were studied in order to develop meaningful accelerated testing procedures for encapsulant evaluation. In a program to study the failure of Tedlar/ethylene vinyl acetate (EVA)/stainless steel modules, failure modes similar to those observed outdoors in real-time conditions were simulated in accelerated testing. An experimental technique was developed to quantitatively assess the extent of degradation.

Liang, R. H.

1985-01-01

383

Mycology studies in space.  

PubMed

The postflight phase of the Apollo MEED mycology attempts to identify survival according to exposure to specific quantitative space flight factors, while the second phase of studies identifies qualitative change other than cell survival [57]. Initial changes incurred in space on a fungal cell can be monitored and further examined on return of the fungal species test system to Earth. The postflight studies present a better understanding of the space environmental influences on living cells and a more clear understanding of the fungal species under examination. PMID:2325748

Volz, P A

1990-02-01

384

STUDY ABROADFOR MARINE AND FRESHWATER BIOLOGY MAJORS study abroad  

E-print Network

STUDY ABROADFOR MARINE AND FRESHWATER BIOLOGY MAJORS study abroad #12;WHY YOU SHOULD STUDY ABROAD 2 STUDY ABROAD FOR MARINE AND FRESHWATER BIOLOGY MAJORS Study abroad programs provide Marine-HEALTH PROFESSIONS OPTIONS Explore the "Study Abroad Guide for Pre-Health Professions" online and speak with your

Pillow, Jonathan

385

study abroad STUDY ABROADFOR HUMAN DEVELOPMENT AND FAMILY SCIENCES MAJORS  

E-print Network

study abroad STUDY ABROADFOR HUMAN DEVELOPMENT AND FAMILY SCIENCES MAJORS #12;WHY YOU SHOULD STUDY ABROAD 2 STUDY ABROAD FOR HUMAN DEVELOPMENT AND FAMILY SCIENCES MAJORS Study abroad programs provide. "Studying abroad is a life-changing opportunity because it allows you to experience firsthand other cultural

John, Lizy Kurian

386

STUDY ABROAD STUDY ABROADFOR RADIO-TELEVISION-FILM MAJORS  

E-print Network

STUDY ABROAD STUDY ABROADFOR RADIO-TELEVISION-FILM MAJORS #12;WHY YOU SHOULD STUDY ABROAD 2 STUDY ABROAD FOR RADIO-TELEVISION-FILM MAJORS Study abroad programs provide Radio-Television-Film majors. AFFORDABILITY Consider the real cost of studying abroad, the difference between a semester in Austin

Johnston, Daniel

387

STUDY ABROADFOR MATheMATicS MAJORS study abroad  

E-print Network

STUDY ABROADFOR MATheMATicS MAJORS study abroad #12;WhY YOU ShOULD STUDY ABROAD 2 STUDY ABROAD FOR MATheMATicS MAJORS Study abroad programs provide Mathematics majors with access to interesting undergraduate research or internships during your stay abroad. PRE-HEALTH PROFESSIONS OPTIONS Explore the "Study

Johnston, Daniel

388

STUDY ABROADFOR TEXTILES AND APPAREL MAJORS study abroad  

E-print Network

STUDY ABROADFOR TEXTILES AND APPAREL MAJORS study abroad #12;WHY YOU SHOULD STUDY ABROAD 2 STUDY ABROAD FOR TEXTILES AND APPAREL MAJORS Study abroad programs provide Textiles and Apparel majors. AFFORDABILITY Consider the real cost of studying abroad: the difference between a semester in Austin

John, Lizy Kurian

389

study abroad STUDY ABROADFOR CHEMISTRY AND BIOCHEMISTRY MAJORS  

E-print Network

study abroad STUDY ABROADFOR CHEMISTRY AND BIOCHEMISTRY MAJORS #12;WHY YOU SHOULD STUDY ABROAD 2 STUDY ABROAD FOR CHEMISTRY AND BIOCHEMISTRY MAJORS Study abroad programs provide Chemistry Explore the "Study Abroad Guide for Pre-Health Professions" online and speak with your academic advisor

Pillow, Jonathan

390

STUDY ABROADFOR MARINE AND FRESHWATER BIOLOGY MAJORS study abroad  

E-print Network

STUDY ABROADFOR MARINE AND FRESHWATER BIOLOGY MAJORS study abroad #12;WHY YOU SHOULD STUDY ABROAD 2 STUDY ABROAD FOR MARINE AND FRESHWATER BIOLOGY MAJORS Study abroad programs provide Marine financial aid? STUDY ABROAD FOR MARINE AND FRESHWATER BIOLOGY MAJORS 3 · How will I get credit

John, Lizy Kurian

391

Personnel Administration Department Study.  

ERIC Educational Resources Information Center

This document reports on a study in the San Diego City Schools designed to (1) assess the level of satisfaction that school site staffs derived from the services of the Personnel Administration Department (PAD) and (2) make recommendations for improving PAD services to sites. The report, organized in five chapters, focuses on three major…

Goren, Paul; Carriedo, Ruben

392

Agricultural Health Study  

Cancer.gov

A prospective cohort study of commercial pesticide applicators, farmers and farmers' spouses in Iowa and North Carolina conducted in collaboration among the National Cancer Institute, the National Institute of Environmental Health Sciences, the U.S. Environmental Protection Agency and the National Institute for Occupational Safety and Health. 

393

NEVADA ARSENIC STUDY  

EPA Science Inventory

The effects of exposure to arsenic in U.S. drinking water at low levels are difficult to assess. In particular, studies of sufficient sample size on US populations exposed to arsenic in drinking water are few. Churchill County, NV (population 25000) has arsenic levels in drinki...

394

Studies in zirconium oxidation  

NASA Technical Reports Server (NTRS)

Study provides insight into the oxidation mechanism of zirconium by combining electrical measurements with oxidation data. The measurement of electrical potential across growing scale on zirconium and the determination of conventional weight-change oxidation data were carried out at 550, 700, and 800 degrees C.

Draley, J. E.; Drunen, C. J.; Levitan, J.

1968-01-01

395

NACUBO Endowment Study, 1998.  

ERIC Educational Resources Information Center

This report presents the results of a 1998 study of endowment assets of 509 higher education institutions, and is intended to allow administrators and trustees to evaluate the performance of their endowments and to acquaint them with the investment policies and practices of other higher education institutions. A brief abstract notes some…

Cambridge Associates, Inc., Boston, MA.

396

Graduate Studies in Education  

E-print Network

Furman University Graduate Studies in Education Furman University From its position as a top-solving and collaborative educational philosophy that encourages students to put into practice the theories and methods learned from texts and lectures. Committed to the education of the whole person, the university provides

397

Supplemental Language Study Program.  

ERIC Educational Resources Information Center

The Supplemental Language Study Group (SLSG) program at Colorado State University (Fort Collins, Colorado) is described. The program was developed following a student's expression of interest in learning "exotic" languages unavailable in the standard foreign language curriculum at the university. This student-run club offers several weekly…

Colorado State Univ., Ft. Collins.

398

Clinical studies in Italy.  

PubMed

The requirements for conducting medical device clinical studies in Europe are not identical in all Member States. That is, variations exist in the way that the requirements in the European Directives are interpreted and enforced. This article provides an overview of the requirements that currently apply in Italy. PMID:20058650

Donawa, Maria

2009-01-01

399

LOS ANGELES CATALYST STUDY  

EPA Science Inventory

This report is a summary of the data collected at the Los Angeles Catalyst Study (LACS) from June 1974 through December 1977. Previous reports of the LACS data were presented at the symposium held in April 1977, covering the data through 1976. The current report follows the same ...

400

Geosynchronous Technology Infusion Studies  

NASA Technical Reports Server (NTRS)

NASA and NOAA are now sponsoring Advanced Geosynchronous Studies (AGeoS), technology work that will lead to the next generation of space sensors located in geosynchronous orbit. This report briefly describes the initial steps being taken to investigate the high priority geosynchronous measurement needs identified so far.

Hilliard, L.; Jenstrom, D.; Chesters, D.; Racette, P.

1997-01-01

401

Acid Rain Study Guide.  

ERIC Educational Resources Information Center

Acid rain is a complex, worldwide environmental problem. This study guide is intended to aid teachers of grades 4-12 to help their students understand what acid rain is, why it is a problem, and what possible solutions exist. The document contains specific sections on: (1) the various terms used in conjunction with acid rain (such as acid…

Hunger, Carolyn; And Others

402

Tethered gravity laboratories study  

NASA Technical Reports Server (NTRS)

The use is studied of tether systems to improve the lowest possible steady gravity level on the Space Station. Particular emphasis is placed by the microgravity community on the achievement of high quality microgravity conditions. The tether capability is explored for active control of the center of gravity and the analysis of possible tethered configurations.

Lucchetti, F.

1989-01-01

403

Soil washing treatability study  

SciTech Connect

Soil washing was identified as a viable treatment process option for remediating soil at the FEMP Environmental Management Project (FEMP). Little information relative to the specific application and potential effectiveness of the soil washing process exists that applies to the types of soil at the FEMP. To properly evaluate this process option in conjunction with the ongoing FEMP Remedial Investigation/Feasibility Study (RI/FS), a treatability testing program was necessary to provide a foundation for a detailed technical evaluation of the viability of the process. In August 1991, efforts were initiated to develop a work plan and experimental design for investigating the effectiveness of soil washing on FEMP soil. In August 1992, the final Treatability Study Work Plan for Operable Unit 5: Soil Washing (DOE 1992) was issued. This document shall be referenced throughout the remainder of this report as the Treatability Study Work Plan (TSWP). The purpose of this treatability study was to generate data to support initial screening and the detailed analysis of alternatives for the Operable Unit 5 FS.

Krstich, M.

1995-12-01

404

A Mobility Study.  

ERIC Educational Resources Information Center

The purpose of the mobility study was to determine what number and percentage of secondary, postsecondary, and full-time adult graduates of vocational-technical programs in Oklahoma find or seek employment in the same geographic region of their graduation. It was also determined what number and percentage of graduates leave the region to seek…

Morton, J. B.; And Others

405

Turbine blade damping study  

NASA Technical Reports Server (NTRS)

Research results and progress on the performance of bladed systems is reported the different topics discussed include: the study of turbine blade damping; forced vibrations of friction damped beam moistures in two dimensions; and a users manual for a computer program for dynamic analysis of bladed systems.

Dominic, R. J.

1984-01-01

406

Wildlife Photography Market Study  

E-print Network

Wildlife Photography on Private Lands Miles Phillips, Assistant Professor and Extension Specialist, Texas AgriLife Extension Service, The Texas A&M System Photos by Miles Phillips A Market Study E-467 03-08 2007, members of the North...

Phillips, Miles

2008-03-24

407

Teaching Biblical Studies Online  

ERIC Educational Resources Information Center

In this edited transcript of a panel at the Society of Biblical Literature (November 23, 2009, Boston, Massachusetts), five Bible scholars give brief presentations on various challenges and opportunities encountered when teaching academic biblical studies courses online in both undergraduate and theological education contexts. Each presentation is…

Delamarter, Stephen; Gravett, Sandra L.; Ulrich, Daniel W.; Nysse, Richard W.; Polaski, Sandra Hack

2011-01-01

408

PHILADELPHIA ROADWAY STUDY  

EPA Science Inventory

The Philadelphia Roadway Study was conducted to determine the horizontal and vertical extinction profiles of particles generated by vehicles, including fine (0-2.5 micrometers), coarse (2.5-15 micrometers), and total (0-15 micrometers) size fractions in the area surrounding a maj...

409

General Aviation Manpower Study.  

ERIC Educational Resources Information Center

Highlights a study examining manpower supply/demand in general aviation. Eight job categories were examined: pilots, flight instructors, engineers, machinists/toolers, and A&P, airframe, and avionics technicians. Findings among others indicate that shortages in indicated job categories exist because personnel are recruited by other industries. (JN)

Feller, Richard

1982-01-01

410

Politics + Science = Futures Studies?  

Microsoft Academic Search

The eternal truth of the future cannot, of course, be the goal of futures studies. Future is full of surprises, uncertainty, trends and trend breaks, irrationality and rationality, and it is changing and escaping from our hands as time goes by. It is also the result of actions made by innumerable more or less powerful actors. In this article, the

MIKA MANNERMAA

1998-01-01

411

Parts application handbook study  

NASA Technical Reports Server (NTRS)

The requirements for a NASA application handbook for standard electronic parts are determined and defined. This study concentrated on identifying in detail the type of information that designers and parts engineers need and expect in a parts application handbook for the effective application of standard parts on NASA projects.

1978-01-01

412

Booklet Classification Study.  

ERIC Educational Resources Information Center

Research studies using booklet classification were implemented by the American College Testing Program to investigate the linkage between the National Assessment of Educational Progress (NAEP) Achievement Levels Descriptions and the cutpoints set to represent student performance with respect to the achievement levels. This paper describes the…

Hanson, Bradley A.; Bay, Luz; Loomis, Susan Cooper

413

INTRODUCTION AND STUDY DESIGN  

EPA Science Inventory

Under the sponsorship of the UNEP/ILO/IPCS, 17 laboratories from diverse regions of the world participated in evaluating the utility of four plant bioassays for detecting genetic hazards of environmental chemicals. he bioassays included in this collaborative study were Arabidopsi...

414

Central American resource studies  

Microsoft Academic Search

Los Alamos National Laboratory has been working with five Central American countries to assist in the development of their energy and mineral resources. Since 1985, mineral resources in Costa Rica, peat resources in Costa Rica and Panama, geothermal energy resources in Honduras and Guatemala, and geothermal field development in El Salvador and Costa Rica have been topics of study. This

E. Van Eeckhout; A. W. Laughlin

1989-01-01

415

SOLID WASTE STUDY  

SciTech Connect

The purpose of this document is to study the solid waste issues brought about by a Type C Investigation; ``Disposal of Inappropriate Material in the Los Alamos County Landfill'' (May 28, 1993). The study was completed in August 1995 by Coleman Research Corporation, under subcontract number 405810005-Y for Los Alamos National Laboratory (LANL). The study confirmed the issues identified in the Type C investigation, and also ascertained further issues or problems. During the course of this study two incidents involving hazardous waste resulted in the inappropriate disposal of the waste. An accidental spill, on June 8, 1995, at one of Laboratory buildings was not handled correctly, and ended up in the LAC Landfill. Hazardous waste was disposed of in a solid waste container and sent to the Los Alamos County Landfill. An attempt to locate the hazardous waste at the LAC Landfill was not successful. The second incident involving hazardous waste was discovered by the FSS-8, during a random dumpster surveillance. An interim dumpster program managed by FSS-8 discovered hazardous waste and copper chips in the solid waste, on August 9, 1995. The hazardous waste and copper chips would have been transported to the LAC Landfill if the audit team had not brought the problem to the awareness of the facility waste management personnel.

PAUL G. ORTIZ - COLEMAN RESEARCH CORP /COMPA INDUSTRIES

1995-08-01

416

Access to space study  

NASA Technical Reports Server (NTRS)

This report summarizes the results of a comprehensive NASA in-house study to identify and assess alternate approaches to access to space through the year 2030, and to select and recommend a preferred cause of action. The goals of the study were to identify the best vehicles and transportation architectures to make major reductions in the cost of space transportation (at least 50%), while at the same time increasing safety for flight crews by at least an order of magnitude. In addition, vehicle reliability was to exceed 0.98 percent, and, as important, the robustness, pad time, turnaround time, and other aspects of operability were to be vastly improved. This study examined three major optional architectures: (1) retain and upgrade the Space Shuttle and expendable launch vehicles; (2) develop new expendable vehicles using conventional technologies and transition from current vehicles beginning in 2005; and (3) develop new reusable vehicles using advanced technology, and transition from current vehicles beginning in 2008. The launch-needs, mission model utilized for for the study was based upon today's projection of civil, defense, and commercial mission payload requirements.

1994-01-01

417

Geothermal Case Studies  

DOE Data Explorer

database.) In fiscal year 2015, NREL is working with universities to populate additional case studies on OpenEI. The goal is to provide a large enough dataset to start conducting analyses of exploration programs to identify correlations between successful exploration plans for areas with similar geologic occurrence models.

Young, Katherine

418

SAFETY FIRST STUDY SAFELY  

E-print Network

SAFETY FIRST WORK AND STUDY SAFELY Emergency Information Contact and Action Guide #12;2 Quick;3 Situation-Specific Instructions Event Medical Emergency Fire Police Emergency Bomb Threat Tornado Chemical.743.2000. #12;8 Tornado In the event of a tornado or tornado warning: 1. Listen to NOAA Weather Radio

Gelfond, Michael

419

Ethics and Study Abroad  

ERIC Educational Resources Information Center

It came as a great surprise recently to read in "The New York Times" that the New York attorney general's office had launched an investigation into possible financial improprieties between colleges and outside organizations that provide study-abroad programs. Subpoenas had been issued to five of the largest program providers, "with more to come."…

Hoffa, William W.

2007-01-01

420

Teaching Ethnic Studies  

ERIC Educational Resources Information Center

Describes a college-level ethnic studies course which helps students understand cultural pluralism by involving them in learning activities such as interviewing immigrants, role playing, and eating an ethnic meal. For journal availability, see SO 506 393. (Author/DB)

Susskind, Jacob L.

1978-01-01

421

RADON / MOISTURE STUDY  

EPA Science Inventory

Limited field study in three basement houses in Mechanicsburg, Pa. Each house will have a radon mitigation installed and be monitored over the course of a year for moisture entry and control. Followed by a more extensive statistical analysis of the data....

422

SERVICEDESTUDESETDELAVIETUDIANTE Studying in  

E-print Network

· Culture, tourism, sports 40 · Lëtzebuergesch for beginners 42 Contacts at the University of Luxembourg 43. The country's unique language situation is part of the cultural identity and facilitates the integration of foreign residents. During your studies discover also the worldwide only Grand Duchy in the heart of Europe

Petriu, Emil M.

423

FLARE EFFICIENCY STUDY  

EPA Science Inventory

The report gives results of a full-scale experimental study to determine the efficiencies of flare burners for disposing of hydrocarbon (HC) emissions from refinery and petrochemical processes. With primary objectives of determining the combustion efficiency and HC destruction ef...

424

Subaltern Studies: A Bibliography  

NSDL National Science Digital Library

Compiled by Henry Schwarz and enhanced by Frank Conlon, this bibliography offers an excellent starting point for graduate students or non-specialists interested in this sub-field of Asian studies. The bibliography is a collaborative product consisting of titles suggested to Schwarz by various H-Asia members. Originally created in 1996, the bibliography has been recently updated.

Conlon, Frank F.

425

Australian Film Studies.  

ERIC Educational Resources Information Center

Although Australia had a vigorous film industry in the silent film era, it was stifled in the 1930s when United States and British interests bought up the Australian distribution channels and closed down the indigenous industry. However, the industry and film study have undergone a renaissance since the advent of the Labor government in 1972,…

Breen, Myles P.

426

STUDY ABROAD @ ULM UNIVERSITY  

E-print Network

STUDY ABROAD @ ULM UNIVERSITY CHEMISTRY CHEMISTRY AND MANAGEMENT ENERGY SCIENCE AND TECHNOLOGY Ulm University--ChemistryUlm University--Chemistry Ulm University--Chemistry Websites Ulm University: http://www.uni-ulm.de Faculty of Natural Sciences: http://www.uni-ulm.de/en/nawi/school-of- chemistry

Pfeifer, Holger

427

Master Study: Ceramics  

ERIC Educational Resources Information Center

In painting and drawing classes, it is typical to ask students to work directly from a master. It is one way to study composition techniques, and to become familiar with classical style firsthand. In museums, easels are set up as artists work, not in an attempt to copy or plagiarize, but in an attempt to be part of history by participating in it.…

Clark, Kelly

2004-01-01

428

Integrative Studies (IGS).  

ERIC Educational Resources Information Center

The Kentucky State University Integrative Studies Program, which is described in this report, consists of seven seminar-type models, three in the Western and four in the non-Western traditions. It is a basic component of a 53-hour core curriculum, and requires both faculty and students to analyze and interpret a body of knowledge involving…

Ciholas, Paul

429

Recycling Study Guide.  

ERIC Educational Resources Information Center

This study guide was designed to help teachers and students understand the problems surrounding solid wastes. It includes an overview of solid waste and recycling, a glossary, suggested activities and a list of resource publications, audiovisual materials and organizations. There are 19 activity suggestions included in this guide designed for use…

Hallowell, Anne; And Others

430

GRADUATE STUDY IN BIOENGINEERING  

E-print Network

GRADUATE STUDY IN BIOENGINEERING Rice University WWW.BIOE.RICE.EDU For admission in The Department of Bioengineering at Rice University is consistently ranked among the nation's top 10 bioengineering and engineering. The cornerstone of our success as a leader in bioengineering is capitalizing on Rice's proximity

Richards-Kortum, Rebecca

431

GRADUATE STUDY IN BIOENGINEERING  

E-print Network

GRADUATE STUDY IN BIOENGINEERING Rice University WWW.BIOE.RICE.EDU For admission in 2015 The Rice University Department of Bioengineering has been ranked among the nation's top 10 bioengineering in bioengineering is capitalizing on Rice's proximity to the Texas Medical Center (TMC), the largest medical center

Richards-Kortum, Rebecca

432

International Study Center Raitenhaslach  

E-print Network

Gottfried Wilhelm Leibniz-Preis 2012 (s. Seite 14). Die von der DFG verlie- hene Auszeichnung würdigt diePolitik: International Study Center Raitenhaslach Forschen: Leibniz-Preis für Barbara Wohlmuth: Leibniz-Preis für Barbara Wohlmuth campusDas Magazin der TU München 1| 2012 Impressum TUMcampus Das

433

Nurses' Health Study (1976-)  

Cancer.gov

Additional Information The Nurses' Health Study was launched in 1976, when 121,700 registered nurses, aged 30-55 years, responded to a mailed questionnaire regarding their health and lifestyle. Women continue to be followed via questionnaires every 2 years. Incident cases of cancer and selected other diagnoses are documented by reviewing medical records.

434

South America Map Study.  

ERIC Educational Resources Information Center

A simple "menu-driven" microcomputer program on map studies, designed to teach the geography of South America and certain economic facts about its countries, is presented. The program is written for an Apple II+ or Apple IIe computer; use on any other microcomputer will require substantial changes due to high resolution drawings and shape tables…

Canipe, Stephen L.

435

Case Studies Volunteering  

E-print Network

E, Bishops Estate Project 6 Greenwork Mates, Drumchapel 8 Dunnottar Woodland Park 10 Garden Wood and their locality so creating stronger and safer communities. These case studies show excellent examples of all these benefits of volunteering, which is precisely why Forestry Commission Scotland works to provide

436

LUXEMBOURG INCOME STUDY (LIS)  

EPA Science Inventory

The LIS database is a collection of household income surveys. The LIS project began in 1983 under the joint sponsorship of the government of the Grand Duchy of Luxembourg and the Center for Population, Poverty and Policy Studies (CEPS). The project is mainly funded by the nationa...

437

Graduate studies Ecosystem Science  

E-print Network

Graduate studies in Ecosystem Science and Management Ph.D. M.S. M.Agr. or Natural Resources Development MNRD Department of Ecosystem Science and Management College of Agriculture and Life Sciences in one or more of four broad research areas: ecosystem science; ecosystem management; spatial

438

Studies in Empowerment.  

ERIC Educational Resources Information Center

This theme issue of the serial "Educational Foundations" contains five articles devoted to the topic of "Studies in Empowerment." In "The Disempowering of Empowerment: Out of the Revolution and into the Classroom," Margaret D. LeCompte and Kathleen Bennett deMarrais focused on placing the term in proper historical context. Guy B. Senese "Away from…

Van Galen, Jane, Ed.; And Others

1992-01-01

439

3?Critical Management Studies  

Microsoft Academic Search

Critical management studies (CMS) offers a range of alternatives to mainstream management theory with a view to radically transforming management practice. The common core is deep skepticism regarding the moral defensibility and the social and ecological sustainability of prevailing conceptions and forms of management and organization. CMS's motivating concern is neither the personal failures of individual managers nor the poor

Paul S. Adler; Linda C. Forbes; Hugh Willmott

2007-01-01

440

Case study: Measuring audience  

E-print Network

be regarded as an accurate measure of whether a particular message is reaching its intended target market metres of the billboard and the software analyses their response. Called TABANAR (Targeted AdvertisingCase study: Measuring audience response to advertising The imagination driving Australia's ICT

Heiser, Gernot

441

AGRICULTURAL HEALTH STUDY  

EPA Science Inventory

The Agricultural Health Study is a large cohort of 90,000 licensed pesticide applicators, plus 30,000 spouses and 20,000 children who are exposed either directly or indirectly. Exposure to pesticides is widespread and is important beyond the agricultural community. Other exposure...

442

Digital communications study  

NASA Technical Reports Server (NTRS)

Research is reported dealing with problems of digital data transmission and computer communications networks. The results of four individual studies are presented which include: (1) signal processing with finite state machines, (2) signal parameter estimation from discrete-time observations, (3) digital filtering for radar signal processing applications, and (4) multiple server queues where all servers are not identical.

Boorstyn, R. R.

1973-01-01

443

Study Some Political Economy  

Microsoft Academic Search

The great leader Chairman Mao has called upon us many times to study some political economy. This call is directed not only to comrades engaged in economic work but also to the broad masses of Communist Party members and revolutionary cadres â especially the Party's responsible cadres. \\

Fang Hai

1972-01-01

444

Demography & Population Studies  

NSDL National Science Digital Library

Coombs Computing Unit at the Australian National University, Canberra now administers CERN's Virtual Library page on Demography & Population Studies. The server has links to 105 sites worldwide which may be of interest to demography and population researchers and others. Listings are nicely organized by access method.

445

Incinerated waste consolidation studies  

SciTech Connect

Products from rotary-kiln incineration studies previously conducted at Colorado School of Mines Research Institute on simulated transuranic waste materials were separated into size fractions. Each size fraction was then consolidated by cementing into drums. The purposes of the study were to determine the effectiveness of various types of equipment in separating the fine <1/4-in. ash from >1/4-in. incinerated waste and to study and evaluate various procedures involved in the use of portland cement concrete in consolidating incinerated simulated transuranic waste materials after size separation. Results of the study showed that either a trommel drum or a vibrating screen device produced the highest separation efficiency and met the operating requirements of no hang-up of material, minimal screen plugging, low number of moving parts, and a small space requirement. Sawing the cured drums of consolidated material showed that mixing <1/4-in. ash into the portland cement grout before pouring and vibrating the grout into the >1/4-in. material produced a sound, solid product with no voids. No significant temperature rise was recorded inside the consolidated drums during the 7 days of monitoring.

Pattengill, M.G.; Bentzen, E.H. III; Roushey, W.J.; Rau, E.L.

1983-06-01

446

A Pilot Study  

Microsoft Academic Search

Ovarian cancer is the fourth highest cause of cancer deaths in the US. Psychosocial issues may be prevalent among these women. This study examined the efficacy of a gynecological cancer resource program. Fifty-three women completed questionnaires over a year's time. The women felt positively about the program, and used several of the services. The most used services were that of

Ellen G. Levine; Barbara Silver

2007-01-01

447

Physiological studies on Rhizobium  

Microsoft Academic Search

In recent years a number of investigations have been conducted to study the influence of u wide variety of materials upon the oxygen utilization of Rhizobium. The results secured, while giving indications of growth effects, furnish only a very incomplete picture of the physiological changes brought about by the organisms. In order to follow more closely the oxidative and reductive

D. W. Thorne; O. R. Neal; R. H. Walker

1936-01-01

448

Unwelcome in Women's Studies  

ERIC Educational Resources Information Center

In this article, the author presents a case of a professor who, in electing to teach a special-topics course on human sex differences, discovers an entire program in the College of Arts and Sciences--Women's Studies (WMST)--whose criteria for course inclusion are in direct violation of several major rules and regulations governing academics at…

Kamolnick, Paul

2007-01-01

449

Case Study: Lotto Numbers  

E-print Network

Case Study: Lotto Numbers The problem is to write a program that checks if all the input numbers cover 1 to 99. Each ticket for the Pick-10 lotto has 10 unique numbersCovered[98] is set to true (see Figure 6.2e). Figure 6.2 If number i appears in a Lotto ticket, isCovered[i-1

Liang, Y. Daniel

450

SERT C project study  

NASA Technical Reports Server (NTRS)

The SERT C (Space Electric Rocket Test - C) project study defines a spacecraft mission that would demonstrate the technology readiness of ion thruster systems for primary propulsion and station keeping applications. As a low cost precursor, SERT C develops the components and systems required for subsequent Solar Electric Propulsion (SEP) applications. The SERT C mission requirements and preliminary spacecraft and subsystem design are described.

1974-01-01

451

Department of Africana Studies  

E-print Network

332 Civil Rights and the Law; AFRS 354 African American Women and the Civil Rights Movement Take and Chair California State University, Long Beach 1250 Bellflower Blvd., Long Beach, CA 90840-0905 (562) 985;Bachelor of Arts in Africana Studies Major Requirements A minimum of 39 units is required for the major

Sorin, Eric J.

452

Gender Studies & Feminist Research  

E-print Network

" Jessie Forsyth: "Reconfiguring Equality: Cross-Epistemological Feminisms" Jennifer Adese: "Les Femmes Michif Otipemisiwak: Theorizing Métis Feminism from Métis Women's Activism" ANGELA MCROBBIE (GOLDSMITH'S) | With English & Cultural Studies February 7, 2012 | 7:30PM | CIBC Hall, MUSC 319 "Feminism, Neo

Thompson, Michael

453

Study Blasts Leadership Preparation  

ERIC Educational Resources Information Center

A far-reaching study offers a damning assessment of the programs that prepare most of the nation's principals and superintendents. Led by Arthur E. Levine, the president of Teachers College, Columbia University, the report says most university-based preparation programs for administrators range in quality from "inadequate to appalling." The…

Archer, Jeff

2005-01-01

454

WELL PURGING STUDY  

EPA Science Inventory

Purging of wells with bailers has been a standard practice in the underground storage tank program as well as other groundwater regulatory programs for many years. Several studies in the Northeast and the West have shown that, under certain circumstances, samples collected witho...

455

Laboratory and simulation studies  

Microsoft Academic Search

The study of Solar System bodies by remote and in situ measurements provides information about geological, chemical and physical properties of materials present in different space environments. Processes (e.g., thermal annealing, UV irradiation, ion bombardment, gas-solid interaction) contribute with different efficiencies to determine the characteristics of materials, depending on both the local environment properties and on the sensitivity of species

L. Colangeli; R. Battaglia; J. R. Brucato; V. della Corte; A. Esposito; F. Esposito; G. Ferrini; E. Mazzotta Epifani; V. Mennella; E. Palomba; P. Palumbo; A. Rotundi

2002-01-01

456

HOUSTON AEROSOL CHARACTERIZATION STUDY  

EPA Science Inventory

An intensive field study of ambient aerosols was conducted in Houston between September 14 and October 14, 1978. Measurements at 12 sites were made using (1) two relocatable monitoring systems instrumented for aerosol and gaseous pollutants, (2) a network of high volume samplers ...

457

Black Studies Year One.  

ERIC Educational Resources Information Center

Though Dubois tried to begin a series of scientific studies on the Negro problem in America more than 70 years ago, only recently have attempts been made to present a true history of the Black man in institutions of higher learning. Until that time, the experience of the Black man was defined in Euro-American terms, or in most cases was completely…

Long, Richard A.

458

Neuter docking mechanism study  

NASA Technical Reports Server (NTRS)

Neuter (or androgynous) docking systems that allow space vehicles with similar or identical docking hardware to dock are discussed. Basic requirements applicable to docking mechanism design, four neuter concepts that were studied, and the concept selected by the NASA Manned Spacecraft Center for detailed investigation are presented.

Jones, J. C.

1972-01-01

459

STUDY ABROAD @ ULM UNIVERSITY  

E-print Network

and biological psychology) foundations of intra- and interpersonal processes (developmental and socialSTUDY ABROAD @ ULM UNIVERSITY PSYCHOLOGY Ulm University--PsychologyUlm University--Psychology Ulm University--Psychology Institute of Psychology and Education: Prof. Dr. Dr. Olga Pollatos ERASMUS

Pfeifer, Holger

460

HANOVER PARK TERTIARY STUDIES  

EPA Science Inventory

During a one year study, four tertiary treatment units were tested and evaluated. Three of the units were deep-bed filters which were used to treat secondary plant effluent. The types of filters used were: (1) an upflow filter with a sand media, (2) a downflow gravity filter with...

461

Plant Study Guide.  

ERIC Educational Resources Information Center

Appropriate for secondary school botany instruction, this study guide focuses on the important roles of plants in human lives. Following a rationale for learning the basic skills of a botanist, separate sections discuss the process sunlight undergoes during photosynthesis, the flow of energy in the food chain, alternative plant lifestyles, plant…

Brynildson, Inga

462

Financial Distress Study Report.  

ERIC Educational Resources Information Center

This report, undertaken by the Secretary of the Department of Health, Education, and Welfare, Elliott Richardson, seeks to establish the need for emergency financial assistance to medical and dental schools, and includes recommendations for appropriate administrative and legislative action. The directive to undertake the study was a provision of…

National Institutes of Health (DHEW), Bethesda, MD. Bureau of Health Manpower Education.

463

Repository seals requirements study  

SciTech Connect

The Yucca Mountain Site Characterization Project, managed by the Civilian Radioactive Waste Management System (CRWMS) Management and Operating Contractor (M and O) is conducting investigations to support the Viability Assessment and the License Application for a high-level nuclear waste repository at Yucca Mountain, Nevada. The sealing subsystem is part of the Yucca Mountain Waste Isolation System. The Yucca Mountain Site Characterization Project is currently evaluating the role of the sealing subsystem (shaft, ramp and exploratory borehole seals) in achieving the overall performance objectives for the Waste Isolation System. This report documents the results of those evaluations. This report presents the results of a repository sealing requirements study. Sealing is defined as the permanent closure of the shafts, ramps, and exploratory boreholes. Sealing includes those components that would reduce potential inflows above the repository, or that would divert flow near the repository horizon to allow vertical infiltration to below the repository. Sealing of such features as emplacement drifts was not done in this study because the current capability to calculate fracture flow into the drifts is not sufficiently mature. The objective of the study is to provide water or air flow performance based requirements for shafts, ramps, and exploratory boreholes located near the repository. Recommendations, as appropriate, are provided for developing plans, seals component testing, and other studies relating to sealing.

NONE

1997-11-03

464

National Indian Education Study  

ERIC Educational Resources Information Center

This report includes information from the National Indian Education Study of American Indian/Alaska Native students in grades 4 and 8 on the 2005 National Assessment of Education Progress (NAEP) in reading and mathematics. The national sample includes both public and private schools (i.e. Bureau of Indian Affairs, Department of Defense Education…

Harvey, Karen Kay

2006-01-01

465

Oxygen boost pump study  

NASA Technical Reports Server (NTRS)

An oxygen boost pump is described which can be used to charge the high pressure oxygen tank in the extravehicular activity equipment from spacecraft supply. The only interface with the spacecraft is the +06 6.205 Pa supply line. The breadboard study results and oxygen tank survey are summarized and the results of the flight-type prototype design and analysis are presented.

1975-01-01

466

Native American Case Studies  

NSDL National Science Digital Library

The Native American Case Studies collection includes more than 80 original, research-based teaching cases focusing on contemporary issues in Indian Country. Teaching notes accompany each case. These can be downloaded and used at no cost. Additional website resources include information on teaching with cases and assessment. Guidelines for submitting cases are also available.

The Evergreen State College

467

Marine electromagnetic induction studies  

Microsoft Academic Search

In reviewing seafloor induction studies conducted over the last seven years, we observe a decline in single-station magnetotelluric (MT) experiments in favour of large, multinational, array experiments with a strong oceanographic component. However, better instrumentation, processing techniques and interpretational tools are improving the quality of MT experiments in spite of the physical limitations of the band limited seafloor environment, and

S. C. Constable

1990-01-01

468

STUDIES ON EXPERIMENTAL HYPERTENSION  

PubMed Central

The consumption of oxygen by slices of renal tissue of the rabbit was studied by means of the Warburg manometric method. The ischemic kidney of the rabbit shows a definite diminution of oxygen consumption, compared with the normal kidney. PMID:19870945

Gerbi, C.; Rubenstein, B. B.; Goldblatt, H.

1940-01-01

469

Environmental Studies An Overview  

E-print Network

Environmental Studies An Overview Environmental scientists conduct research to identify and abate the environment--degradation, conservation, recycling, and replenishment--is central to the work of environmental water supplies, and reclaim contaminated land and water to comply with federal environmental regulations

Colorado at Boulder, University of

470

NGLW RCRA Storage Study  

SciTech Connect

The Idaho Nuclear Technology and Engineering Center (INTEC) at the Idaho National Engineering and Environmental Laboratory contains radioactive liquid waste in underground storage tanks at the INTEC Tank Farm Facility (TFF). INTEC is currently treating the waste by evaporation to reduce the liquid volume for continued storage, and by calcination to reduce and convert the liquid to a dry waste form for long-term storage in calcine bins. Both treatment methods and activities in support of those treatment operations result in Newly Generated Liquid Waste (NGLW) being sent to TFF. The storage tanks in the TFF are underground, contained in concrete vaults with instrumentation, piping, transfer jets, and managed sumps in case of any liquid accumulation in the vault. The configuration of these tanks is such that Resource Conservation and Recovery Act (RCRA) regulations apply. The TFF tanks were assessed several years ago with respect to the RCRA regulations and they were found to be deficient. This study considers the configuration of the current tanks and the RCRA deficiencies identified for each. The study identifies four potential methods and proposes a means of correcting the deficiencies. The cost estimates included in the study account for construction cost; construction methods to minimize work exposure to chemical hazards, radioactive contamination, and ionizing radiation hazards; project logistics; and project schedule. The study also estimates the tank volumes benefit associated with each corrective action to support TFF liquid waste management planning.

R. J. Waters; R. Ochoa; K. D. Fritz; D. W. Craig

2000-06-01

471

Teaching Social Studies Indepth  

ERIC Educational Resources Information Center

Social studies, too frequently, is taught in a survey approach whereby pupils obtain subject matter in a shallow manner. Forgetting and hazy recalls are typical of this procedure of instruction. Covering many topics in a relatively short period of time does not make for achievement which is long-lasting. Then too, selected pupils might be left…

Ediger, Marlow

2014-01-01

472

Urban Studies. Senior Division.  

ERIC Educational Resources Information Center

This curriculum guide describes a course on urban studies for high school seniors. A major aim is to help students understand the nature of cities and towns. Themes are intended to stimulate inquiry into urban problems and present opportunities for concept formation and problem solving by encouraging direct experience with the environment. It is…

Ontario Dept. of Education, Toronto.

473

LARP Joint IR studies  

E-print Network

LARP initiated Joint IR Studies (JIRS) in October 2007 (FY2008) to coordinate efforts related to the LHC Phase I and II upgrades previously situated either in Accelerator Systems or in Magnet Systems. This note outlines JIRS goals, main directions and milestones.

Zlobin, A V

2008-01-01

474

Eastern Frequency Response Study  

SciTech Connect

This study was specifically designed to investigate the frequency response of the Eastern Interconnection that results from large loss-of-generation events of the type targeted by the North American Electric Reliability Corp. Standard BAL-003 Frequency Response and Frequency Bias Setting (NERC 2012a), under possible future system conditions with high levels of wind generation.

Miller, N.W.; Shao, M.; Pajic, S.; D'Aquila, R.

2013-05-01

475

Hostel User Study.  

ERIC Educational Resources Information Center

Findings from a study of living accommodations for young people are given in the first part. Features are identified that are regarded as important by management and residents. Suggestions are made as to how user response may be predicted and the responses of the residents to eight schemes are examined in detail. Also considered are--(1) the…

Allen, Phyllis

476

Asian Studies Certificate  

E-print Network

to combine the study of Asian languages, culture, politics, and history with their major. It is available, communication, economics, the natural sciences, political science, or any career path that may involve Certificate have gone on to jobs in business, government, sales, media, and teaching positions both

Saldin, Dilano

477

Photovoltaic evaluation study  

NASA Astrophysics Data System (ADS)

Realizing the value and potential of PV-power as well as the growing need for increased cooperation and sharing of knowledge in the field of photovoltaics, FINNIDA and UNICEF decided to undertake a study of selected PV-projects. There were two main objectives for the study: To gather, compile, evaluate and share information on the photovoltaic technology appropriate to developing countries, and to promote the interest and competence of Finnish research institutes, consultants and manufacturers in photovoltaic development. For this purpose a joint evaluation of significant, primarily UN-supported projects providing for the basic needs of rural communities was undertaken. The Gambia and Kenya offered a variety of such projects, and were chosen as target countries for the study. The projects were chosen to be both comparable and complimentary. In the Gambia, the main subject was a partially integrated health and telecommunications project, but a long-operating drinking water pumping system was also studied. In Kenya, a health project in the Turkana area was examined, and also a large scale water pumping installation for fish farming. Field visits were made in order to verify and supplement the data gathered through document research and earlier investigations. Individual data gathering sheets for the project form the core of this study and are intended to give the necessary information in an organized and accessible format. The findings could practically be condensed into one sentence: PV-systems work very well, if properly designed and installed, but the resources and requirements of the recipients must be considered to a higher degree.

Johnson, G.; Heikkilae, M.; Melasuo, T.; Spanner, S.

478

Public Works Transportation Infrastructure Study  

E-print Network

Public Works Transportation Infrastructure Study Minneapolis City of Lakes Minneapolis Public Works Transportation Infrastructure Study #12;Public Works Transportation Infrastructure Study Minneapolis City Works Transportation Infrastructure Study Minneapolis City of Lakes Background: · Currently, funding

Minnesota, University of

479

STUDY ABROAD DEPARTMENT OF HISTORY  

E-print Network

STUDY ABROAD DEPARTMENT OF HISTORY FOR HISTORY MAJORS study abroad #12;WHY YOU SHOULD STUDY ABROAD 2 STUDY ABROAD FOR HISTORY MAJORS Study abroad programs provide History majors the opportunity students is provided within this brochure. AFFORDABILITY Consider the real cost of studying abroad

John, Lizy Kurian

480

Advanced Motor Drives Studies  

NASA Technical Reports Server (NTRS)

This report presents an evaluation of advanced motor drive systems as a replacement for the hydrazine fueled APU units. The replacement technology must meet several requirements which are particular to the space applications and the Orbiter in general. Some of these requirements are high efficiency, small size, high power density. In the first part of the study several motors are compared, based on their characteristics and in light of the Orbiter requirements. The best candidate, the brushless DC is chosen because of its particularly good performance with regards to efficiency. Several power electronics drive technologies including the conventional three-phase hard switched and several soft-switched inverters are then presented. In the last part of the study, a soft-switched inverter is analyzed and compared to its conventional hard-switched counterpart. Optimal efficiency is a basic requirement for space applications and the soft-switched technology represents an unavoidable trend for the future.

Ehsani, M.; Tchamdjou, A.

1997-01-01

481

E85 Dispenser Study  

SciTech Connect

This study reviews E85 dispensing infrastructure advances and issues and evaluates the geographic concentration of flexible fuel vehicles (FFVs), E85 stations, ethanol production facilities, and E85 suppliers. Costs, space, financial incentives, and barriers to adding E85 fueling equipment at existing stations are also assessed. This study found that E85 is increasingly available in the U.S. in half of the states; however, the other half have minimal or no E85 fueling options. Despite these gains, E85 is only available at 1% of U.S. gasoline stations. Ethanol production reached 9.5 billion gallons in 2008, but less than 1% is consumed as E85. FFVs have not reached a significant concentration in any county, metropolitan area, or state.

Moriarty, K.; Johnson, C.; Sears, T.; Bergeron, P.

2009-12-01

482

Study Thermographic Flaw Detection  

NASA Technical Reports Server (NTRS)

The development of thermographic inspection methods for use on aerospace structures is under investigation. Several different material systems, structural geometries and defect types have been included in this study so as to establish a baseline from which future Infrared Thermography(IRT) testing can be made. This study examines various thermal loading techniques in an attempt to enhance the likelihood of capturing and identifying critically sized flaws under 'non laboratory' actual working conditions. Qualification techniques and calibration standards are also being investigated to standardize the thermographic method. In conjunction with the thermographic inspections, advanced image processing techniques including digital filtering and neural networks have been investigated to increase the ability of detecting and sizing flaws. Here, the digitized thermographic images are mathematically manipulated through various filtering techniques and/or artificial neural mapping schemes to enhance its overall quality, permitting accurate flaw identification even when the signal-to-noise ratio is low.

Walker, James L.; Workman, Gary L.

1996-01-01

483

Study Thermographic Flaw Detection  

NASA Technical Reports Server (NTRS)

The development of thermographic inspection methods for use on aerospace structures is under investigation. Several different material systems, structural geometries and defect types have been included in this study so as to establish a baseline from which future IRT testing can be made. This study examines various thermal loading techniques in an attempt to enhance the likelihood of capturing and identifying critically sized flaws under 'non-laboratory' actual working conditions. Qualification techniques and calibration standards are also being investigated to standardize the thermographic method. In conjunction with the thermographic inspections, advanced image processing techniques including digital filtering and neural networks have been investigated to increase the ability of 91 detecting and sizing flaws. Here, the digitized thermographic images are mathematically manipulated through various filtering techniques and/or artificial neural mapping schemes to enhance its overall quality, permitting accurate flaw identification even when the signal-to-noise ratio is low.

Walker, James L.; Workman, Gary L.

1996-01-01

484

Advanced life support study  

NASA Technical Reports Server (NTRS)

Summary reports on each of the eight tasks undertaken by this contract are given. Discussed here is an evaluation of a Closed Ecological Life Support System (CELSS), including modeling and analysis of Physical/Chemical Closed Loop Life Support (P/C CLLS); the Environmental Control and Life Support Systems (ECLSS) evolution - Intermodule Ventilation study; advanced technologies interface requirements relative to ECLSS; an ECLSS resupply analysis; the ECLSS module addition relocation systems engineering analysis; an ECLSS cost/benefit analysis to identify rack-level interface requirements of the alternate technologies evaluated in the ventilation study, with a comparison of these with the rack level interface requirements for the baseline technologies; advanced instrumentation - technology database enhancement; and a clean room survey and assessment of various ECLSS evaluation options for different growth scenarios.

1991-01-01

485

Drop coalescence studies  

NASA Technical Reports Server (NTRS)

The objective of this experimental study is to understand the detailed mechanics of the coalescence of liquid drops. The experiments are being conducted in an immiscible acoustic levitator with degassed water as the host medium. Typically, a quasineutrally buoyant drop of silicon oil mixed with bromobenzene is levitated close to the velocity node of the levitator. A second drop of the same liquid is introduced, and as it slowly seeks levitation position, the drops coalesce. Coalescence is delayed until the host film between drops is completely drained. Following coalescence, the excess surface energy in the coalesced drop is dissipated through shape oscillations. The final events of film rupture followed by drop coalescence are rapid and are photographically studied with high-speed video (1000 fps). The laser-induced fluorescence technique is used to visualize the dynamics of host film drainage. The details of the coalescence mechanics are presented.

Anikumar, A. V.; Wang, T. G.

1990-01-01

486

Alcohol Studies Database  

NSDL National Science Digital Library

Since 1987, staff members at the Rutgers University Center of Alcohol Studies have been collecting citations of documents related to alcohol. Today, they have over 80,000 citations and much of the material is related to research and professional materials that deal with the subject. Additionally, the database contains a small collection of educational and prevention materials designed for use by educators, parents, and public health workers. The site is maintained by the Scholarly Communication Center, the Center of Alcohol Studies, and the Rutgers University Libraries. Visitors to the site can search by subject, or perform a more advanced search as well. The site also includes a "Help" area, which includes information on limiting searches, links to full text, and suggestions on using Boolean techniques.

487

NASA study grants  

NASA Astrophysics Data System (ADS)

To expand human exploration of the Solar System, the Office of Exploration of the National Aeronautics and Space Administration has awarded 20 contracts for ideas, concepts, devices, systems, and trajectory, operation and implementation plans. Winning proposals came from five industry-related firms, two organizations in the space-support business, and thirteen universities; they were chosen from 115 entries.Geophysical studies to be supported include site characterization of the Oregon moonbase (Oregon L-5 Society, Inc., Oregon City), evolution of design alternatives for exploration of Mars by balloon (Titan Systems, Inc., San Diego, Calif.), design considerations of a lunar production plant (Boston University, Chestnut Hill, Mass.), planetary materials and resource utilization (Michigan Technological University, Houghton), Mars tethered sample return study (University of Colorado, Boulder), Teleprospector, a teleoperated robotic field geologist (University of New Mexico, Albuquerque), and the International Lunar Polar Orbiter (International Space University, Boston, Mass.).

488

MIT Security Studies Program  

NSDL National Science Digital Library

Based at the Center for International Studies at MIT, the Security Studies Program is interested in "the integration of technical and political analysis of national and international security problems." Visitors to the site can look over their research agenda, learn about their degree programs, and also look at their interactive calendar. Scholars will definitely want to make their way to the "Program Publications" area. Here they will find the Program's annual report, their research journal, and a monthly newsletter titled "Early Warning". Moving on, visitors should also take a look at some of their working papers, which include "Transforming the Rewards for Military Service" and "The Political Science of Agent Orange". The site is rounded out with a search engine and information about relevant conferences.

489

Quantitative Impact Study (QIS)  

NSDL National Science Digital Library

The Bank of International Settlements is offering information on its Quantitative Impact Study, which will assess "whether the Committee has met its goals with regard to the New Basel Capital Accord" of 1999. The site contains all 37 pages of the questionnaire being sent to international banks along with short explanations of the study's methods and modes. The questionnaire is in Excel format and includes three main chapters covering general information about each bank, details of the standardized approaches to credit risk assessment, and the International Ratings-Based Approach (IRB) taken by each bank. The site also links to a Website on the New Basel Capital Accord, a more risk-sensitive framework than the original Basel Capital Accord which was written in the year previous.

490

A Wetland Field Study  

NSDL National Science Digital Library

The field projects at this site give students an opportunity to investigate a number of wetland characteristics firsthand: surveying wetland vegetation, soils, water quality and wildlife; documenting the wetland from an artist's perspective; investigating land uses along its periphery; and refining a base map upon which all collected information can be recorded. This resource explains how to organize the field study, thereby securing the interest of the students. It is part of a module that aims to help students get to know the complexities of wetlands, discover wildlife, enjoy the experience of being outdoors, and learn how necessary wetlands are to the health of our environment. For educators and their middle school students, it suggests ways to study wetland characteristics, why wetlands are important, and how students and teachers can help protect a local wetland in any part of the country. An associated set of activities is also available.

491

Pathology Case Study: Epilepsy  

NSDL National Science Digital Library

This neuropathology case study, provided by the University of Pittsburgh Department of Pathology, is an excellent learning tool for students and instructors in the health science fields. In this case, a 27-year-old female presents with a history of seizures. A detailed patient history along with gross and microscopic images of the patientâ??s brain are included in this case study. The official diagnosis found in the â??Final Diagnosisâ? section is accompanied by a discussion of the contributing doctorâ??s findings and a list of references. This is an excellent resource for students in the health sciences to familiarize themselves with using patient history and laboratory results to diagnose patientâ??s conditions.

French, Jacqueline A.

492

Options Study - Phase II  

SciTech Connect

The Options Study has been conducted for the purpose of evaluating the potential of alternative integrated nuclear fuel cycle options to favorably address the issues associated with a continuing or expanding use of nuclear power in the United States. The study produced information that can be used to inform decisions identifying potential directions for research and development on such fuel cycle options. An integrated nuclear fuel cycle option is defined in this study as including all aspects of the entire nuclear fuel cycle, from obtaining natural resources for fuel to the ultimate disposal of used nuclear fuel (UNF) or radioactive wastes. Issues such as nuclear waste management, especially the increasing inventory of used nuclear fuel, the current uncertainty about used fuel disposal, and the risk of nuclear weapons proliferation have contributed to the reluctance to expand the use of nuclear power, even though it is recognized that nuclear power is a safe and reliable method of producing electricity. In this Options Study, current, evolutionary, and revolutionary nuclear energy options were all considered, including the use of uranium and thorium, and both once-through and recycle approaches. Available information has been collected and reviewed in order to evaluate the ability of an option to clearly address the challenges associated with the current implementation and potential expansion of commercial nuclear power in the United States. This Options Study is a comprehensive consideration and review of fuel cycle and technology options, including those for disposal, and is not constrained by any limitations that may be imposed by economics, technical maturity, past policy, or speculated future conditions. This Phase II report is intended to be used in conjunction with the Phase I report, and much information in that report is not repeated here, although some information has been updated to reflect recent developments. The focus in this Options Study was to identify any nuclear fuel cycle technology or option that may result in a significant beneficial impact to the issues as compared to the current U.S. approach of once-through use of nuclear fuel in LWRs or similar reactors followed by direct disposal of UNF. This approach was taken because incremental differences may be difficult to clearly identify and justify due to the large uncertainties that can be associated with the specific causes of the issues. Phase II of this Options Study continued the review of nuclear fuel cycle options that was initiated and documented during Phase I, concentrating on reviewing and summarizing the potential of integrated nuclear fuel cycles. However, based on the reviews of previous studies and available data, it was not always possible to clearly determine sufficiently large differences between the various fuel cycle and technology options for some of the issues or evaluation measures, for example, in cases where only incremental differences with respect to the issues might be achieved regardless of the fuel cycle option or technologies being considered, or where differences were insufficient to clearly rise above the uncertainties.

R. Wigeland; T. Taiwo; M. Todosow; W. Halsey; J. Gehin

2010-09-01

493

World Biofuels Study  

SciTech Connect

This report forms part of a project entitled 'World Biofuels Study'. The objective is to study world biofuel markets and to examine the possible contribution that biofuel imports could make to help meet the Renewable Fuel Standard (RFS) of the Energy Independence and Security Act of 2007 (EISA). The study was sponsored by the Biomass Program of the Assistant Secretary for Energy Efficiency and Renewable Energy (EERE), U.S. Department of Energy. It is a collaborative effort among the Office of Policy and International Affairs (PI), Department of Energy and Oak Ridge National Laboratory (ORNL), National Renewable Energy Laboratory (NREL) and Brookhaven National Laboratory (BNL). The project consisted of three main components: (1) Assessment of the resource potential for biofuel feedstocks such as sugarcane, grains, soybean, palm oil and lignocellulosic crops and development of supply curves (ORNL). (2) Assessment of the cost and performance of biofuel production technologies (NREL). (3) Scenario-based analysis of world biofuel markets using the ETP global energy model with data developed in the first parts of the study (BNL). This report covers the modeling and analysis part of the project conducted by BNL in cooperation with PI. The Energy Technology Perspectives (ETP) energy system model was used as the analytical tool for this study. ETP is a 15 region global model designed using the MARKAL framework. MARKAL-based models are partial equilibrium models that incorporate a description of the physical energy system and provide a bottom-up approach to study the entire energy system. ETP was updated for this study with biomass resource data and biofuel production technology cost and performance data developed by ORNL and NREL under Tasks 1 and 2 of this project. Many countries around the world are embarking on ambitious biofuel policies through renewable fuel standards and economic incentives. As a result, the global biofuel demand is expected to grow very rapidly over the next two decades, provided policymakers stay the course with their policy goals. This project relied on a scenario-based analysis to study global biofuel markets. Scenarios were designed to evaluate the impact of different policy proposals and market conditions. World biofuel supply for selected scenarios is shown in Figure 1. The reference case total biofuel production increases from 12 billion gallons of ethanol equivalent in 2005 to 54 billion gallons in 2020 and 83 billion gallons in 2030. The scenarios analyzed show volumes ranging from 46 to 64 billion gallons in 2020, and from about 72 to about 100 billion gallons in 2030. The highest production worldwide occurs in the scenario with high feedstock availability combined with high oil prices and more rapid improvements in cellulosic biofuel conversion technologies. The lowest global production is found in the scenario with low feedstock availability, low oil prices and slower technology progress.

Alfstad,T.

2008-10-01

494

EOS mapping accuracy study  

NASA Technical Reports Server (NTRS)

Studies were performed to evaluate various image positioning methods for possible use in the earth observatory satellite (EOS) program and other earth resource imaging satellite programs. The primary goal is the generation of geometrically corrected and registered images, positioned with respect to the earth's surface. The EOS sensors which were considered were the thematic mapper, the return beam vidicon camera, and the high resolution pointable imager. The image positioning methods evaluated consisted of various combinations of satellite data and ground control points. It was concluded that EOS attitude control system design must be considered as a part of the image positioning problem for EOS, along with image sensor design and ground image processing system design. Study results show that, with suitable efficiency for ground control point selection and matching activities during data processing, extensive reliance should be placed on use of ground control points for positioning the images obtained from EOS and similar programs.

Forrest, R. B.; Eppes, T. A.; Ouellette, R. J.

1973-01-01

495

Coastal Management case study  

NSDL National Science Digital Library

To prepare for the case study, lecture material on coastal landforms and processes is presented. Particular attention is paid to barrier islands, such as the Outer Banks. During the lecture, typical coastal engineering structures, such as groins, breakwaters, and jetties, are introduced. The case study is introduced with a brief overview of North Carolina's coastal management laws, Figure Eight Island's geography, and the current controversy over whether to build a terminal groin. Students are then broken down into small groups and presented with two opposing editorials. The groups are instructed to try to come to consensus as to whether the terminal groin should be allowed or disallowed or to suggest a third alternative. After approximately 25 minutes, each group informally reports out to the rest of the class.

Anne Jefferson

496

Payload training methodology study  

NASA Technical Reports Server (NTRS)

The results of the Payload Training Methodology Study (PTMS) are documented. Methods and procedures are defined for the development of payload training programs to be conducted at the Marshall Space Flight Center Payload Training Complex (PCT) for the Space Station Freedom program. The study outlines the overall training program concept as well as the six methodologies associated with the program implementation. The program concept outlines the entire payload training program from initial identification of training requirements to the development of detailed design specifications for simulators and instructional material. The following six methodologies are defined: (1) The Training and Simulation Needs Assessment Methodology; (2) The Simulation Approach Methodology; (3) The Simulation Definition Analysis Methodology; (4) The Simulator Requirements Standardization Methodology; (5) The Simulator Development Verification Methodology; and (6) The Simulator Validation Methodology.

1990-01-01

497

Simulation verification techniques study  

NASA Technical Reports Server (NTRS)

Results are summarized of the simulation verification techniques study which consisted of two tasks: to develop techniques for simulator hardware checkout and to develop techniques for simulation performance verification (validation). The hardware verification task involved definition of simulation hardware (hardware units and integrated simulator configurations), survey of current hardware self-test techniques, and definition of hardware and software techniques for checkout of simulator subsystems. The performance verification task included definition of simulation performance parameters (and critical performance parameters), definition of methods for establishing standards of performance (sources of reference data or validation), and definition of methods for validating performance. Both major tasks included definition of verification software and assessment of verification data base impact. An annotated bibliography of all documents generated during this study is provided.

Schoonmaker, P. B.; Wenglinski, T. H.

1975-01-01

498

Protein crystallization studies  

NASA Technical Reports Server (NTRS)

The Structural Biology laboratory at NASA Marshall Spaceflight Center uses x-ray crystallographic techniques to conduct research into the three-dimensional structure of a wide variety of proteins. A major effort in the laboratory involves an ongoing study of human serum albumin (the principal protein in human plasma) and its interaction with various endogenous substances and pharmaceutical agents. Another focus is on antigenic and functional proteins from several pathogenic organisms including the human immunodeficiency virus (HIV) and the widespread parasitic genus, Schistosoma. My efforts this summer have been twofold: first, to identify clinically significant drug interactions involving albumin binding displacement and to initiate studies of the three-dimensional structure of albumin complexed with these agents, and secondly, to establish collaborative efforts to extend the lab's work on human pathogens.

Lyne, James Evans

1996-01-01

499

Study of bipolar batteries  

NASA Astrophysics Data System (ADS)

The status of development of bipolar batteries with an aqueous electrolyte was determined. Included in the study were lead-acid, nickel-cadmium, nickel-zinc, nickel-iron, and nickel-hydrogen batteries. The technical and patent literature is reviewed and a bibliography covering the past 15 years is presented. Literature data are supplemented by a survey of organizations. The principal interest was in bipolar lead-acid batteries and more recently in bipolar nickel-hydrogen batteries for space applications.

Clifford, J. E.

1984-06-01

500

Electroencephalographic studies of sleep  

NASA Technical Reports Server (NTRS)

Various experimental studies on sleep are described. The following areas are discussed: (1) effect of altered day length on sleep, (2) effect of a partial loss of sleep on subsequent nocturnal sleep; (3) effect of rigid control over sleep-wake-up times; (4) sleep and wakefulness in a time-free environment; (5) distribution of spindles during a full night of sleep; and (6) effect on sleep and performance of swiftly changing shifts of work.

Webb, W. B.; Agnew, H. W., Jr.

1975-01-01