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1

Investigation of structural information for boron-rich solids and aluminates via NMR and NQR studies  

SciTech Connect

Along with NMR, Nuclear Quadrupole Resonance (NQR) has become important recently for obtaining structural information from oxide glasses. The NQR studies prove in this thesis that they provide more accurate structural information than the NMR studies have done. This study presents boron and aluminum NMR, and NQR studies for some borate glasses and compounds, icosahedral boron-rich solids, some crystalline aluminosilicates. Various borates were employed to acquire structural information as well as to determine the quadrupole parameters (the quadrupole coupling constant Qcc and the asymmetry parameter {eta}) using NQR under a guidance of NMR or vice versa. By NQR a previously unknown boron site was observed for vitreous Li{sub 2}O{center dot}B{sub 2}O{sub 3}. The NMR and NQR studies were performed on some icosachedral boron-rich solids: {alpha}-rhombohedral boron (B{sub 12}), {beta}-boron (B{sub 105}) and boron carbide (B{sub 12}C{sub 3}). Three different forms of crystalline aluminosilicate (Al{sub 2}SiO{sub 5}) were studied by NQR. The NQR study yielded more accurate values of the quadrupole parameters for {sup 27}Al than the previous NMR single crystal study did.

Lee, D.

1991-01-01

2

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

3

Structure-activity study of thiazides by magnetic resonance methods (NQR, NMR, EPR) and DFT calculations.  

PubMed

The paper presents a comprehensive analysis of the relationship between the electronic structure of thiazides and their biological activity. The compounds of interest were studied in solid state by the resonance methods nuclear quadrupole resonance (NQR), nuclear magnetic resonance (NMR) and electron paramagnetic resonance (EPR) and quantum chemistry (ab inito and DFT) methods. Detailed parallel analysis of the spectroscopic parameters such as quadrupole coupling constant (QCC) NQR chemical shift (delta), chemical shift anisotropy (CSA), asymmetry parameter (eta), NMR and hyperfine coupling constant (A), EPR was performed and the electronic effects (polarisation and delocalisation) were revealed and compared. Biological activity of thiazides has been found to depend on many factors, but mainly on the physico-chemical properties whose assessment was possible on the basis of electron density determination in the molecules performed by experimental and theoretical methods. PMID:15670953

Latosi?ska, J N

2005-01-01

4

27Al-NQR\\/NMR Study of Kondo Semiconductor CeFe2Al10  

Microsoft Academic Search

27Al-NQR\\/NMR measurements have been performed on CeFe2Al10 in relevance to the novel phase below T0=27 K of isostructural CeRu2Al10. NQR peaks are assigned to five crystallographically inequivalent Al sites. No splitting of the NQR spectra down to 1.5 K confirms the lack of phase transition in this compound. The gaplike decrease in the spin-lattice relaxation rate 1\\/T1 above about 20

Yukihiro Kawamura; Shingo Edamoto; Tomoaki Takesaka; Takashi Nishioka; Harukazu Kato; Masahiro Matsumura; Yo Tokunaga; Shinsaku Kambe; Hiroshi Yasuoka

2010-01-01

5

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

6

Ab initio DFT study of bisphosphonate derivatives as a drug for inhibition of cancer: NMR and NQR parameters.  

PubMed

DFT computations were carried out to characterize the (17)Oand (2)H electric field gradient, EFG, in various bisphosphonate derivatives. The computations were performed at the B3LYP level with 6-311++G (d,P) standard basis set. Calculated EFG tensors were used to determine the (17)O and (2)H nuclear quadrupole coupling constant, ? and asymmetry parameter, ?. For better understanding of the bonding and electronic structure of bisphosphonates, isotropic and anisotropic NMR chemical shieldings were calculated for the (13)C, (17)O and (31)P nuclei using GIAO method for the optimized structure of intermediate bisphosphonates at B3LYP level of theory using 6-311++G (d, p) basis set. The results showed that various substituents have a strong effect on the nuclear quadrupole resonance (NQR) parameters (?, ?) of (17)O in contrast with (2)H NQR parameters. The NMR and NQR parameters were studied in order to find the correlation between electronic structure and the activity of the desired bisphosphonates. In addition, the effect of substitutions on the bisphosphonates polarity was investigated. Molecular polarity was determined via the DFT calculated dipole moment vectors and the results showed that substitution of bromine atom on the ring would increase the activity of bisphosphonates. PMID:21633790

Aghabozorg, Hussein; Sohrabi, Beheshteh; Mashkouri, Sara; Aghabozorg, Hamid Reza

2012-03-01

7

NQR investigation and characterization of cocrystals and crystal polymorphs  

NASA Astrophysics Data System (ADS)

The application of 14N NQR to the study of cocrystals and crystal polymorphs is reviewed. In ferroelectric and antiferroelectric organic cocrystals 14N NQR is used to determine proton position in an N-H...O hydrogen bond and proton displacement below TC. In cocrystal isonicitinamide - oxalic acid (2:1) 14N NQR is used to distinguish between two polymorphs and to determine the type of the hydrogen bond (N-...H-O). The difference in the 14N NQR spectra of cocrystal formers and cocrystal is investigated in case of carbamazepine, saccharin and carbamazepine - saccharin (1:1). The experimental resolution allows an unambiguous distinction between the 14N NQR spectrum of the cocrystal and the 14N NQR spectra of the cocrystal formers. The possibility of application of NQR and double resonance for the determination of the inhomogeneity of the sample and for the study of the life time of an unstable polymorph is discussed.

Seliger, Janez; Žagar, Veselko; Asaji, Tetsuo

2013-05-01

8

27Al-NQR Study on Novel Phase Transition in CeOs2Al10  

NASA Astrophysics Data System (ADS)

We have performed 27Al-NQR measurements in CeOs2Al10 which exhibits a novel phase transition at T0=29 K The NQR parameters determined for all the Al sites in ambient pressure were compared with those in CeRu2Al10 with T0=27 K and CeFe2Al10 with no phase transition. The distinct NQR splitting just below T0=32.5 K under pressure 0.66 GPa ensures an enhancement of T0 and a homogeneous transition. Despite the increase of T0, the nuclear spin-lattice relaxation rate 1/Tl is suppressed over whole range of temperature than in ambient pressure. The characteristic features of no critical slowing down at T0 and of the remarkable decrease of 1/T1T starting at T > T0 become prominent under pressure, suggesting an approach to Kondo semiconductor in a valence fluctuation regime.

Matsumura, M.; Inagaki, T.; Kato, H.; Nishioka, T.; Tanida, H.; Sera, M.

2012-12-01

9

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

10

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

11

27Al-NQR/NMR Study of Kondo Semiconductor CeFe2Al10  

NASA Astrophysics Data System (ADS)

27Al-NQR/NMR measurements have been performed on CeFe2Al10 in relevance to the novel phase below T0=27 K of isostructural CeRu2Al10. NQR peaks are assigned to five crystallographically inequivalent Al sites. No splitting of the NQR spectra down to 1.5 K confirms the lack of phase transition in this compound. The gaplike decrease in the spin-lattice relaxation rate 1/T1 above about 20 K, following the Korringa law (T1T = const.) below 20 K, indicates a pseudogap opening near the Fermi level. The gap magnitude of 70 K with a mid-gap state of 42% is estimated based on a rectangular density of states. The gap magnitude is much larger than the gap of 15 K evaluated previously from the electrical resistivity, which suggests CeFe2Al10 to be a Kondo semiconductor with a Kondo temperature much higher than 300 K.

Kawamura, Yukihiro; Edamoto, Shingo; Takesaka, Tomoaki; Nishioka, Takashi; Kato, Harukazu; Matsumura, Masahiro; Tokunaga, Yo; Kambe, Shinsaku; Yasuoka, Hiroshi

2010-10-01

12

NQR studies of gallium and bismuth trichlorides complexes with n- and ? -donors.  

NASA Astrophysics Data System (ADS)

The 35,37C1, 69,71Ga and 209Bi NQR spectra of the charge-transfer complexes of GaCl 3 with ketones, nitriles and BiCl 3 with methyl substituted derivatives of benzene at 77K have been investigated. The complexing of BiCl 3 with methyl substituted derivatives of benzene leads to an increase in 209Bi Quadrupole Coupling Constant (QCC) along the direction of the maximum field gradient of e 2Qq zzh. The nature of the frequency changes of 35,37 Cl in the acceptor molecule is different for axial and equatorial chlorine atoms. There is a correlation between the QCC 14N of the nitriles and the shifts of the 69Ga on complexing and also between shifts of the 35Cl and 69 Ga frequencies on complexing.

Popkova, L. A.; Guryanova, E. N.; Volkov, A. F.

13

35 Cl NQR spectra of group 1 and silver dichloromethanesulfonates  

Microsoft Academic Search

The dichloromethanesulfonates of silver and other +1-charged cations, M\\u000a ?+?(Cl2CHSO (M = Ag, Tl, Li, Na, K, Rb, Cs) were synthesized and studied by 35Cl NQR. Dichloromethanesulfonic acid was prepared by the methanolysis of dichloromethanesulfonyl chloride, and was then neutralized\\u000a with the carbonates of the +1-charged cations to produce the corresponding dichloromethanesulfonate salt. This NQR study completed\\u000a the investigation of

Gabriel Gillette; Gary Wulfsberg

2008-01-01

14

Copper Nqr and NMR Study of Metal-Substituted Yttrium BARIUM(2) COPPER(3) OXYGEN(7) and Yttrium BARIUM(2) COPPER(4) OXYGEN(8)  

NASA Astrophysics Data System (ADS)

Pulsed nuclear quadrupole resonance (NQR) and nuclear magnetic resonance (NMR) have been used to investigate the effect of metal-substitution for copper in YBa_2Cu_3O_7 (YBCO123) and YBa_2Cu_4O_8 (YBCO124). Among many metal substitutions, Zn has an especially dramatic effect in suppressing the superconducting temperature T_{c}, and hence superconductivity. More interesting is that Zn and Fe have the same T_{c} suppression effect in YBCO124. This study focuses on the Zn substitutions in YBCO123 and Zn, Fe, and Co substitutions in YBCO124. In Zn doped YBCO123, Cu(2), plane site, NQR spectra and the frequency dependence of the spin-lattice relaxation rates have been measured over a temperature range from 77 K to 300 K to study the correlation of the suppression of the relaxation rate with the distance between the probe Cu nuclei and the impurity. It is found that the relaxation rate is insensitive to the variation of the NQR resonance frequency. However, by comparing the results of the Zn doped YBCO124 with those of YBCO123, it can be concluded that the suppression of the relaxation rate for both YBCO compounds in the normal state is caused by destruction of short-range antiferromagnetic correlation with substitution of nonmagnetic ion Zn on the Cu(2) sites. NQR and NMR measurements were carried out on both Cu(2), plane, and Cu(1), chain sites, for various concentrations of Zn, Fe, and Co dopants in YBCO124 over a temperature range from 77 K to 300 K. A strong correlation of the enhancement of Cu(2) spin lattice relaxation rate and suppression of superconductivity by impurities was found. The temperature dependence of the Cu(2) NMR linewidth exhibits a strong RKKY type exchange interaction below 225 K for Zn and Fe doped samples, which indicates the formation of the local magnetic moment. The enhancement of the relaxation rate is caused by the local magnetic moment Fe^ {+3} ion and the moments on Cu(2) neighbors when Zn^{+2} is substituted on Cu(2). This study gives us a clear picture of the spin pseudogap behavior in the high temperature superconductor cuprates. It also suggests that the magnetic moment on the CuO_2 plane may relate to the suppression of T_{c} in metal-substituted YBCO124.

Cheng, Show-Jye

15

Quadrupole coupling parameters and structural aspects of crystalline and amorphous solids by NMR and NQR  

SciTech Connect

NMR and NQR techniques were combined to obtain the quadrupole coupling constant (Qcc) and asymmetry parameter ({eta}) and extract structural information for several borate, gallate, and metavanadate compounds and glasses. {sup 71}Ga and {sup 69}Ga NMR was used to study crystalline {beta}-Ga{sub 2}O{sub 3} and several gallate glasses. Quadrupole parameters were acquired for GaO{sub 6} and GaO{sub 4} units in {beta}-Ga{sub 2}O{sub 3} by the computer simulation of the NMR powder patterns. A sensitive CW NQR spectrometer was built to detect NQR resonances below 2 MHz. The spectrometer includes a modified Robinson oscillator-detector, a new bi-symmetric square wave Zeeman modulator and a computerized data acquisition system. {sup 51}V (I = 7/2) NQR resonances below 850 kHz were detected for several metavanadates at both room temperature and liquid nitrogen temperature. Two methods, Zeeman perturbed NQR powder pattern and {sup 10}B NQR, can be employed to obtain both Qcc and {eta}. With a double coil tank circuit design, pure {sup 11}B NQR was used to determine the fraction of borons in BO{sub 3} and BO{sub 4} configurations in hydrated zinc borates. {sup 11}B NMR and NQR were also used to study lead borate glasses.

Mao, Degen.

1991-01-01

16

Intermetallic solid solution Fe{sub 1-x}Co{sub x}Ga{sub 3}: Synthesis, structure, NQR study and electronic band structure calculations  

SciTech Connect

Unlimited solid solution Fe{sub 1-x}Co{sub x}Ga{sub 3} was prepared from Ga flux. Its crystal structure was refined for Fe{sub 0.5}Co{sub 0.5}Ga{sub 3} (P4{sub 2}/mnm, a=6.2436(9), c=6.4654(13), Z=4) and showed no ordering of the metal atoms. A combination of the electronic band structure calculations within the density functional theory (DFT) approach and {sup 69,71}Ga nuclear quadrupole resonance (NQR) spectroscopy clearly shows that the Fe-Fe and Co-Co dumbbells are preferred to the Fe-Co dumbbells in the crystals structure. The band structure features a band gap of about 0.4 eV, with the Fermi level crossing peaks of a substantial density of electronic states above the gap for x>0. The solid solution is metallic for x>0.025. The study of the nuclear spin-lattice relaxation shows that the rate of the relaxation, 1/T{sub 1}, is very sensitive to the Co concentration and correlates well with the square of the density of states at the Fermi level, N{sup 2}(E{sub F}). - Graphical abstract: Rate of the nuclear spin-lattice relaxation, 1/T{sub 1}, observed in the {sup 69}Ga NQR experiments for the intermetallic solid solution Fe{sub 1-x}Co{sub x}Ga{sub 3} is the highest for x=0.25 with the highest calculated density of electronic states at the Fermi level, N(E{sub F}); in general, 1/T{sub 1} correlates with N{sup 2}(E{sub F}). Highlights: Black-Right-Pointing-Pointer Fe{sub 1-x}Co{sub x}Ga{sub 3} solid solution is prepared in single crystalline form from Ga flux. Black-Right-Pointing-Pointer In the crystal structure Fe-Fe and Co-Co dumbbells are preferred to Fe-Co dumbbells. Black-Right-Pointing-Pointer Metal-to-semiconductor transition occurs at 0NQR spectra efficiently probe local environment of two independent Ga atoms. Black-Right-Pointing-Pointer Rate of nuclear spin-lattice relaxation follows squared DOS at the Fermi level.

Verchenko, V.Yu.; Likhanov, M.S.; Kirsanova, M.A. [Department of Chemistry, Lomonosov Moscow State University, Moscow 119991 (Russian Federation)] [Department of Chemistry, Lomonosov Moscow State University, Moscow 119991 (Russian Federation); Gippius, A.A; Tkachev, A.V.; Gervits, N.E. [Faculty of Physics, Lomonosov Moscow State University, Moscow 119991 (Russian Federation) [Faculty of Physics, Lomonosov Moscow State University, Moscow 119991 (Russian Federation); A.V. Shubnikov Institute of Crystallography, Moscow 119333 (Russian Federation); Galeeva, A.V. [Faculty of Physics, Lomonosov Moscow State University, Moscow 119991 (Russian Federation)] [Faculty of Physics, Lomonosov Moscow State University, Moscow 119991 (Russian Federation); Buettgen, N.; Kraetschmer, W. [Institut fuer Physik, University of Augsburg, Augsburg D-86135 (Germany)] [Institut fuer Physik, University of Augsburg, Augsburg D-86135 (Germany); Lue, C.S. [Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan (China)] [Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan (China); Okhotnikov, K.S. [Materials and Environmental Chemistry, Stockholm University, Stockholm (Sweden)] [Materials and Environmental Chemistry, Stockholm University, Stockholm (Sweden); Shevelkov, A.V., E-mail: shev@inorg.chem.msu.ru [Department of Chemistry, Lomonosov Moscow State University, Moscow 119991 (Russian Federation)

2012-10-15

17

NQR-NMR studies of higher alcohol synthesis Cu-Co catalysts  

SciTech Connect

The primary objective of the project is to examine the relations between the catalytic and magnetic properties of the copper-cobalt higher alcohol synthesis catalysts. We have undertaken to investigate the magnetic character by studying the Nuclear Quadrupole resonance of copper and (Zerofield) Nuclear Magnetic Resonance of cobalt in copper cobalt catalysts.

Not Available

1991-12-17

18

35Cl NQR spectra of group 1 and silver dichloromethanesulfonates  

NASA Astrophysics Data System (ADS)

The dichloromethanesulfonates of silver and other +1-charged cations, M + (Cl2CHSO3-) ( M = Ag, Tl, Li, Na, K, Rb, Cs) were synthesized and studied by 35Cl NQR. Dichloromethanesulfonic acid was prepared by the methanolysis of dichloromethanesulfonyl chloride, and was then neutralized with the carbonates of the +1-charged cations to produce the corresponding dichloromethanesulfonate salt. This NQR study completed the investigation of the chloroacetates and chloromethanesulfonates of silver, Ag + (Cl x CH3 - x SO3-) and Ag + (Cl x CH3 - x CO2-), and suggests (1) that the ability of organochlorine atoms to coordinate to silver decreases as the number of electron-withdrawing groups (Cl, SO3-, CO2-) attached to the carbon atom increases; (2) that the unusually large NQR spectral width found among M + (Cl2CHCO2-) salts is not present among M + (Cl2CHSO3-) salts, and therefore is not generally characteristic of the dichloromethyl group in salts.

Gillette, Gabriel; Wulfsberg, Gary

2008-01-01

19

Landmine detection using feedback NQR  

Microsoft Academic Search

Nuclear quadrupole resonance (NQR) is well suited for detecting land mines with non-metallic cases. It provides both spatial localization and chemical identification of explosives. A search coil produces a train of radio frequency (RF) magnetic pulses that perturb the orientation of nitrogen nuclei contained within the explosive material. Following each RF pulse, the nuclei rotate back to orientations of lower

Andrew J. Blauch; Jeffrey L. Schiano; Mark D. Ginsberg

1999-01-01

20

Explosives detection by nuclear quadrupole resonance (NQR)  

Microsoft Academic Search

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

Allen N. Garroway; M. L. Buess; J. P. Yesinowski; J. B. Miller; Ronald A. Krauss

1994-01-01

21

14N NQR in the tetrazole family  

NASA Astrophysics Data System (ADS)

14N NQR frequencies and spin-lattice relaxation times were measured in technologically important 5-aminotetrazole and 5-aminotetrazole monohydrate at different temperatures between 77 K and 300 K. Five NQR triplets ?+, ?- and ?0 were found for the five inequivalent nitrogen atoms in each compound between 0.7 MHz and 4 MHz. Carr-Purcell based multipulse sequences were used to accumulate quadrupole echo signals before the FFT analysis. Assignment of the frequencies to atomic positions was made and the results are analysed in relation to the molecular chemical bonds and possible H-bonds in the crystal structures. The new NQR frequencies are reasonably related to the previously published NQR spectrum of the third family member, 1H-tetrazole.

Pirnat, Janez; Lužnik, Janko; Jazbinšek, Vojko; Žagar, Veselko; Seliger, Janez; Klapötke, Thomas M.; Trontelj, Zvonko

2009-10-01

22

Supramolecular synthon pattern in solid clioquinol and cloxiquine (APIs of antibacterial, antifungal, antiaging and antituberculosis drugs) studied by ³?Cl NQR, ¹H-¹?O and ¹H-¹?N NQDR and DFT/QTAIM.  

PubMed

The quinolinol derivatives clioquinol (5-chloro-7-iodo-8-quinolinol, Quinoform) and cloxiquine (5-chloro-8-quinolinol) were studied experimentally in the solid state via ³?Cl NQR, ¹H-¹?O and ¹H-¹?N NQDR spectroscopies, and theoretically by density functional theory (DFT). The supramolecular synthon pattern of O-H···N hydrogen bonds linking dimers and ?-? stacking interactions were described within the QTAIM (quantum theory of atoms in molecules) /DFT (density functional theory) formalism. Both proton donor and acceptor sites in O-H···N bonds were characterized using ¹H-¹?O and ¹H-¹?N NQDR spectroscopies and QTAIM. The possibility of the existence of O-H···H-O dihydrogen bonds was excluded. The weak intermolecular interactions in the crystals of clioquinol and cloxiquine were detected and examined. The results obtained in this work suggest that considerable differences in the NQR parameters for the planar and twisted supramolecular synthons permit differentiation between specific polymorphic forms, and indicate that the more planar supramolecular synthons are accompanied by a greater number of weaker hydrogen bonds linking them and stronger ?···? stacking interactions. PMID:21080020

Latosi?ska, Jolanta Natalia; Latosi?ska, Magdalena; Tomczak, Marzena Agnieszka; Seliger, Janez; Zagar, Veselko

2011-07-01

23

35Cl NQR spectra of group 1 and silver dichloromethanesulfonates  

NASA Astrophysics Data System (ADS)

The dichloromethanesulfonates of silver and other +1-charged cations, M +(Cl2CHSO{3/-}) (M=Ag, Tl, Li, Na, K, Rb, Cs) were synthesized and studied by 35Cl NQR. Dichloromethanesulfonic acid was prepared by the methanolysis of dichloromethanesulfonyl chloride, and was then neutralized with the carbonates of the +1-charged cations to produce the corresponding dichloromethanesulfonate salt. This NQR study completed the investigation of the chloroacetates and chloromethanesulfonates of silver, Ag+(Cl x CH3-x SO{3/-}) and Ag+(Cl x CH3-x CO{2/-}), and suggests (1) that the ability of organochlorine atoms to coordinate to silver decreases as the number of electron-withdrawing groups (Cl, SO{3/-} CO{2/-}) attached to the carbon atom increases; (2) that the unusually large NQR spectral width found among M+(Cl2CHCO{2/-}) salts is not present among M+(Cl2CHS0{3/-}) salts, and therefore is not generally characteristic of the dichloromethyl group in salts.

Gillette, Gabriel; Wulfsberg, Gary

24

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

PubMed

A low frequency (0.5-5MHz) battery operated sensitive pulsed NQR spectrometer with a transmitter power up to 5W and a total mass of about 3kg 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

25

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

26

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.; Hase, Claudia C.

2014-01-01

27

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

28

The development of pure ?-NQR techniques for measurements of nuclear ground state quadrupole moments in lithium isotopes  

NASA Astrophysics Data System (ADS)

A ?-NQR spectrometer becomes a powerful tool to study changes in nuclear ground state properties along isotopic chains when coupled to a laser excitation beamline to polarise the nuclei of interest. Recently, the ?-NQR technique in a zero magnetic field has been applied for the first-time to measure ratios of static nuclear quadrupole moments of, Li. Preliminary results of the experiment determining the ratios Q9/Q8 and Q11/Q9 show agreement with present literature values with improved precision.

Voss, A.; Pearson, M. R.; Billowes, J.; Buchinger, F.; Chow, K. H.; Crawford, J. E.; Hossein, M. D.; Kiefl, R. F.; Levy, C. D. P.; MacFarlane, W. A.; Mané, E.; Morris, G. D.; Parolin, T. J.; Saadaoui, H.; Salman, Z.; Smadella, M.; Song, Q.; Wang, D.

2011-09-01

29

Nuclear electric quadrupole moment of 9Li using zero-field ?-detected NQR  

NASA Astrophysics Data System (ADS)

A ?-detected nuclear quadrupole resonance (NQR) spectrometer becomes a powerful tool to study changes in nuclear ground-state properties along isotopic chains when coupled to a laser excitation beamline to polarize the nuclei of interest. Recently, the ?-NQR technique in a zero magnetic field has been applied for the first time to measure the ratio of static nuclear quadrupole moments of 8, 9Li, Q9/Q8 = 0.966 75(9) denoted by Q8 for 8Li and Q9 for 9Li, respectively. This shows agreement with present literature values but with significantly improved precision. Based on the literature, the quadrupole moment for 8Li has been re-evaluated to be |Q8| = 32.6(5) mb. From this, the quadrupole moment for 9Li is calculated as |Q9| = 31.5(5) mb with the error being dominated by the error of Q8.

Voss, A.; Pearson, M. R.; Billowes, J.; Buchinger, F.; Chow, K. H.; Crawford, J. E.; Hossein, M. D.; Kiefl, R. F.; Levy, C. D. P.; MacFarlane, W. A.; Mané, E.; Morris, G. D.; Parolin, T. J.; Saadaoui, H.; Salman, Z.; Smadella, M.; Song, Q.; Wang, D.

2011-07-01

30

Two-dimensional NQR using ultra-broadband electronics  

NASA Astrophysics Data System (ADS)

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 14N) by using multi-frequency excitation and a single RF coil. Experimental results on pure samples and mixtures are also presented.

Mandal, S.; Song, Y.-Q.

2014-03-01

31

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

32

Rapid detection of arsenic minerals using portable broadband NQR  

NASA Astrophysics Data System (ADS)

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

33

NQR-NMR studies of higher alcohol synthesis Cu-Co catalysts. Quarterly technical progress report, June 15--September 15, 1991  

SciTech Connect

The primary objective of the project is to examine the relations between the catalytic and magnetic properties of the copper-cobalt higher alcohol synthesis catalysts. We have undertaken to investigate the magnetic character by studying the Nuclear Quadrupole resonance of copper and (Zerofield) Nuclear Magnetic Resonance of cobalt in copper cobalt catalysts.

Not Available

1991-12-17

34

A study of the electronic effects in amides of trivalent phosphorus acids by the N 14 and Cl 35 NQR method  

Microsoft Academic Search

In the classes of compound studied, the unshared pair of electrons of the nitrogen atom makes the greatest contribution to the magnitude of the electric field gradient (EFG) at the N 14 nucleus. The direction of the principal axis z of the EFG tensor is close to the direction of the orbital of the unshared pair of electrons of the

D. Ya. Osokin; I. A. Safin; I. A. Nuretdinov

1975-01-01

35

Three-dimensional high-inductance birdcage coil for NQR applications.  

PubMed

A birdcage coil capable of operating simultaneously and independently in three orthogonal dimensions has been developed. A co-rotational end-ring mode producing an RF field in the longitudinal direction was utilized in addition to the two common transverse orthogonal modes. Two conductor turns were used for each of the coil's windows, increasing its inductance by a factor of four, thereby, making the coil suitable for low-frequency applications. Two or three-frequency detection can be easily carried out with this device. Orthogonality of the coil's channels allows arbitrarily close frequency positioning of each resonant mode, potentially useful in wide-line NQR studies, in which simultaneous excitation/detection of signals from three adjacent regions of a single wide line can be performed. The coil's performance was evaluated using a three-dimensional scheme, in which a circularly polarized experiment was combined with a linearly polarized measurement at another frequency, resulting in SNR improvement by 55%. PMID:16584871

Peshkovsky, A S; Cerioni, L; Osan, T M; Avdievich, N I; Pusiol, D J

2006-09-01

36

Local electric state of noncentrosymmetric superconductor Mo3Al2C revealed by Mo NQR and NMR experiments  

NASA Astrophysics Data System (ADS)

Mo nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements were performed on a noncentrosymmetric superconductor Mo3Al2C to investigate the local electronic state at Mo nuclei, which carries the electrons responsible for superconductivity. The NQR frequency, which is linked to the electric field gradient at Mo site, was determined from 95Mo NMR spectrum and the result was verified by the independent 97Mo NQR measurement. The experimentally obtained value is compared to the result of a point charge calculation to extract the EFG induced by conduction electrons and reveal the local electronic state.

Ihara, Y.; Kimura, Y.; Kumagai, K.; Bauer, E.; Rogl, G.; Rogl, P.

2012-12-01

37

Addition compounds of antimony trichloride and tribromide. Crystal structure and charge transfer from NQR data  

NASA Astrophysics Data System (ADS)

The correlation analysis of the quadrupcle coupling constants(QCC) for the antimony nuclei in the intermolecular compounds of SbCl 3 and SbBr 3 with aromatic hydrocarbons is carried out. The results confirm a supposition about the general similarity of the crystal structures of these complexes. The correlative dependence between the antimony QCC values and also the results of the chlorine and bromine NQR spectra Investigation permit the evaluation of the relative acceptor strength of the antimony trihalide molecules.

Kjuntsel, I. A.; Gordeev, A. D.

38

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

39

Part I. Analyzing the distribution of gas law questions in chemistry textbooks. Part II. Chlorine-35 NQR spectra of group 1 and silver dichloromethanesulfonates  

NASA Astrophysics Data System (ADS)

Part I. Two studies involving the gas law questions in eight high school and Advanced Placement/college chemistry textbooks were performed using loglinear analysis to look for associations among six variables. These variables included Bloom's Taxonomy (higher-order, lower-order), Book Type (high school, college), Question Format (multiple-choice, problem, short answer), Question Placement (in-chapter, end-of-chapter, test bank), Representation (macroscopic, microscopic, symbolic), and Arkansas Science Standard (conceptual, mathematical; gas laws, pressure conversion, stoichiometry). The first study, involving the conceptual gas law questions, found the Book Type and Question Placement variables had the biggest impact, each appearing in 5 of the 11 significant associations. The second study, involving the mathematical gas law questions, found the Question Placement had the biggest impact, appearing in 7 of the 11 significant associations, followed by Book Type and the Arkansas Science Standard variables, which appeared in 5 of the 11 significant associations. These studies showed that compared to the high school books, college books have fewer multiple-choice questions (compared to short-answer and problem questions), fewer in-chapter questions (compared to end-of-chapter and test bank questions), fewer questions in the chapters and more questions at the end of the chapters and fewer multiple-choice questions in and at the end of the books and more multiple-choice questions in the test banks. Part II. The dichloromethanesulfonate salts of several +1 charged cations, M+Cl2CHSO3 - (M = Li, Na, K, Rb Ag, Cs Tl) were synthesized and studied by 35Cl nuclear quadrupole resonance (NQR). Dichloromethanesulfonic acid was prepared by the methanolysis of dichloromethanesulfonyl chloride, which was neutralized with the metal carbonates to produce the corresponding metal dichloromethanesulfonate salts. This study completed the NQR investigation of the family of chloroacetates and chloromethanesulfonates of silver. The study suggests that the ability of organochlorine atoms to coordinate to silver ions decreases as the number of electron-withdrawing groups attached to carbon atom bound to the coordinating chlorine atom increases. The unusually large NQR spectral width found among M+Cl2CHCO2 - salts are not present among M+Cl2CHSO 3- salts and does not appear to be generally characteristic of the dichloromethyl family of salts.

Gillette, Gabriel

40

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

41

Heteronuclear and quadrupolar second moment determination of the NQR line of 127I in NaIO4.  

PubMed

This work reports on a theoretical expression of the heteronuclear dipolar second moment (M2IS) of a NQR line of spin 5/2 nuclei. The result is applied to obtain M2IS for the resonance line of 127I in NaIO4, and in addition, an indirect determination of the quadrupolar second moment is given. PMID:10023847

Azurmendi, H F; Nagel, O A; Ramia, M E

1998-12-01

42

Measurement of in-situ stress in salt and rock using NQR techniques  

SciTech Connect

A discussion of how stress and strain affect the quantities which can be measured in an NQR experiment shows that, for stresses of the magnitude to be expected at depths up to about 10,000 feet, quadrupole coupling constants will fall in the range of 1 to 10 kHz for both the sodium and chloride ions in NaCl. The most promising system involves pulsed nuclear double resonance detection; and alterative is to observe the quadrupolar splitting of the NMR signal. Choices to be made in the measurement and mapping techniques are discussed. The well-known perturbation of the homogenous stress field in the neighborhood of a borehole is shown to be advantageous from the point of view of obtaining directional information on the stress. Construction and operation of a borehole stress sensor are considered. The NQR technique seems feasible for measuring the magnitude and direction of underground stress with a resolution of about 25 psi, or 2.5% at 1000 psi. Downhole instrumentation suitable for in-situ determinations of stress appears within the state of the art. Additional tasks required on the project are identified.

Schempp, E.; Hirschfeld, T.; Klainer, S.

1980-12-01

43

Nuclear Quadrupole Resonance Studies of Charge Distributions in Molecular Solids  

Microsoft Academic Search

A detailed description of an NMR-NQR double resonance spectrometer designed and constructed in this laboratory is given, including some instruction on its use. ('14)N NQR data obtained by pulse methods for six classes of nitrogen-containing compounds are presented and analyzed in the framework of the Townes and Dailey theory. A study of the anti-cancer drugs cyclophosphamide, isophosphamide and triphosphamide suggests

Steven Garry Greenbaum

1982-01-01

44

Beta-detected NQR in zero field with a low energy beam of 8Li+  

NASA Astrophysics Data System (ADS)

Beta-detected nuclear quadrupole resonances ( ?-NQR) in zero field are observed using a beam of low energy highly polarized radioactive Li+8. The resonances were detected in SrTiO 3, Al 2O 3 and Sr 2RuO 4 single crystals by monitoring the beta-decay anisotropy as a function of a small audio frequency magnetic field. The resonances show clearly that Li+8 occupies one site with non-cubic symmetry in SrTiO 3, two in Al 2O 3 and three sites in Sr 2RuO 4. The resonance amplitude and width are surprisingly large compared to the values expected from transitions between the |±2>?|±1> spin states, indicating a significant mixing between the |±m> quadrupolar split levels.

Salman, Z.; Kiefl, R. F.; Chow, K. H.; MacFarlane, W. A.; Kreitzman, S. R.; Arseneau, D. J.; Daviel, S.; Levy, C. D. P.; Maeno, Y.; Poutissou, R.

2006-03-01

45

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

46

Structure of the Cu-NQR Spectrum in Hg-1223 Between 4.2 K and 145 K  

NASA Astrophysics Data System (ADS)

An extremely low noise RF preamplifier cooled with liquid helium has been developed and is used to perform Cu-NQR measurements for Hg-1223 (Tc=134 K) at temperatures from 4.2 K to 145 K. At temperatures from 4.2 K to 20 K the spectra are centered at 15 MHz with a spectral width of approximately 2 MHz, similar to the Cu-NQR spectra of the other members of the HgBa2Can-1CunO2n+2+? series. The Cu-NQR spectra in this temperature range exhibit some features indicating an unresolved splitting but they can still be fitted quite well by a set of two pairs of 63/65Cu lines, as expected for the 1223 structure. The spectra at 40 K and above clearly show a structure that can not be fitted suitable by a set of two pairs of 63/65Cu lines. However, a fit with a set of four pairs of 63/65Cu lines is in good agreement with the experimental results. Furthermore, the spectra at 80 K, 85 K and 90 K show a strong variation with respect to each other which might indicate a structural change like the formation of a superstructure, as discussed for other high-Tc compounds, instead of a simple disorder in the crystal lattice.

Breitzke, H.; Lüders, K.; Gippius, A. A.; Antipov, E. V.

47

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

48

Central role of the Na+-translocating NADH:quinone oxidoreductase (Na+-NQR) in sodium bioenergetics of Vibrio cholerae.  

PubMed

Abstract Vibrio cholerae is a Gram-negative bacterium that lives in brackish or sea water environments. Strains of V. cholerae carrying the pathogenicity islands infect the human gut and cause the fatal disease cholera. Vibrio cholerae maintains a Na+ gradient at its cytoplasmic membrane that drives substrate uptake, motility, and efflux of antibiotics. Here, we summarize the major Na+-dependent transport processes and describe the central role of the Na+-translocating NADH:quinone oxidoreductase (Na+-NQR), a primary Na+ pump, in maintaining a Na+-motive force. The Na+-NQR is a membrane protein complex with a mass of about 220 kDa that couples the exergonic oxidation of NADH to the transport of Na+ across the cytoplasmic membrane. We describe the molecular architecture of this respiratory complex and summarize the findings how electron transport might be coupled to Na+-translocation. Moreover, recent advances in the determination of the three-dimensional structure of this complex are reported. PMID:25205724

Steuber, Julia; Halang, Petra; Vorburger, Thomas; Steffen, Wojtek; Vohl, Georg; Fritz, Günter

2014-12-01

49

Staggered magnetization in La2-xSrxCuO4 from 139La NQR and muSR: Effects of Sr doping in the range 0  

Microsoft Academic Search

We have used 139La nuclear quadrupole resonance (NQR) and positive muon spin rotation (muSR) measurements to probe the weakly doped antiferromagnetic (AF) region (x<0.02) of the La2-xSrxCuO4 system below the three-dimensional (3D) AF ordering (Néel) temperature TN(x). From these measurements, our previous 139La NQR measurements [F. C. Chou et al., Phys. Rev. Lett. 71, 2323, (1993)], and auxiliary 139La nuclear

F. Borsa; P. Carreta; J. H. Cho; F. C. Chou; Q. Hu; D. C. Johnston; A. Lascialfari; D. R. Torgeson; R. J. Gooding; N. M. Salem; K. J. E. Vos

1995-01-01

50

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

51

Investigation of Structural Information for Boron - Solids and Aluminates via NMR and Nqr Studies  

Microsoft Academic Search

Nuclear Magnetic Resonance (NMR) has been prevailed in investigating local structures for a variety of materials: various oxide glasses, zeolites, superconductors, etc. Since glasses have short range ordered structures instead of long range ordered ones in crystals, NMR is usually more useful in determining the local structures for many glasses than any other detection methods do. Along with NMR, Nuclear

Donghoon Lee

1991-01-01

52

NQR-NMR studies of higher alcohol synthesis Cu-Co catalysts  

SciTech Connect

Copper and cobalt are the key elements in syngas conversion catalyst systems used for higher alcohol synthesis. Their proximity and synergy sensitively control the selectivity and efficiency of the process. It is believed that their outer electronic charge distribution which is responsible for their electrical and magnetic properties might be governing their catalytic properties also. To examine the correlation between catalytic and magnetic properties, a series of copper cobalt catalysts (Co/Cu ratio 5:1 to 5:5) with and without a support were prepared. The nuclear quadrupole resonance spectrum of copper and (zero-field) nuclear magnetic resonance spectrum of cobalt and magnetization and hysteresis character of the catalyst were analyzed. Similar to the catalytic results, the magnetic results also were found to be very sensitive to the preparation technique. The results indicate possible electron exchange between copper and cobalt, and cobalt and the support Titania.

Not Available

1991-01-14

53

Nuclear Structure Studies with Polarized Radioactive Beams  

SciTech Connect

Nuclear moment studies on nuclei far from the beta-stability line, performed by taking advantage of the projectile fragmentation reaction, are reviewed. A method to produce spin polarization/alignment in the projectile fragments was developed and utilized for the beta-NMR/NQR measurements. Several new findings in nuclear structure physics were obtained from the nuclear moment experiments done with these techniques.

Asahi, K.; Uchida, M.; Inoue, T.; Hatakeyama, M.; Kagami, S.; Hasama, Y.; Suzuki, K. [Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro-ku, Tokyo 152-8551 (Japan); Ueno, H.; Nagatomo, T.; Yoshimi, A.; Kameda, D.; Ishihara, M. [RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan); Shimada, K. [Cyclotron and Radioisotope Center, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi, 980-8578 (Japan); Nagae, D. [Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki 319-1195 (Japan); Murata, J.; Narita, K. [Department of Physics, Rikkyo University, 3-34-1Nishi-Ikebukuro, Toshima-ku, Tokyo 171-8501 (Japan); Kawamura, H. [Department of Physics, Rikkyo University, 3-34-1Nishi-Ikebukuro, Toshima-ku, Tokyo 171-8501 (Japan); RIKEN Nishina Center, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)

2009-08-04

54

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

55

Field-tuned critical fluctuations in YFe2Al10: Evidence from magnetization, 27Al NMR, and NQR investigations  

NASA Astrophysics Data System (ADS)

We report magnetization, specific heat, and NMR investigations on YFe2Al10 over a wide range of temperature and magnetic field and zero field (NQR) measurements. Magnetic susceptibility, specific heat, and spin-lattice relaxation rate divided by T(1/T1T) follow a weak power law (˜T-0.4) temperature dependence, which is a signature of the critical fluctuations of Fe moments. The value of the Sommerfeld-Wilson ratio and the linear relation between 1/T1T and ? suggest the existence of ferromagnetic correlations in this system. No magnetic ordering down to 50 mK in Cp(T)/T and the unusual T and H scaling of the bulk and NMR data are associated with a magnetic instability which drives the system to quantum criticality. The magnetic properties of the system are tuned by field wherein ferromagnetic fluctuations are suppressed and a crossover from quantum critical to Fermi-liquid behavior is observed with increasing magnetic field.

Khuntia, P.; Strydom, A. M.; Wu, L. S.; Aronson, M. C.; Steglich, F.; Baenitz, M.

2012-12-01

56

Unconventional superconductivity near quantum critical point revealed by Co-NQR measurements on Nax(H3O)CoO2·yH2O  

NASA Astrophysics Data System (ADS)

The nuclear quadrupole resonance (NQR) frequency of Co nuclei and the nuclear spin lattice relaxation rate 1/T1 were measured on several bilayered hydrate (BLH) Nax(H3O)CoO2·yH2O (y˜1.3) with variety of superconducting (SC) and magnetic transition temperatures, Tc and TM, together with non-SC mono-layered hydrate (MLH) Nax(H3O)CoO2·yH2O (y˜0.7). In the high temperature region above 70 K, 1/T1T in all the samples follows the same temperature dependence which is interpreted as the pseudogap behavior. In the BLH compounds, 1/T1T increases with decreasing temperature below 70 K, and the values of 1/T1T at Tc are large in high-Tc samples. The magnetic ordering is ascertained from the observation of the prominent divergence of 1/T1T at TM in the samples whose NQR frequency is higher than 12.5 MHz. The temperature dependence of 1/T1T is found to be consistently expressed by a unique function with two fitting parameters. We analyze the temperature dependence of 1/T1T on the basis of this function, and investigate the relationship between the magnetic fluctuations and superconductivity in the BLH compounds.

Ihara, Y.; Takeya, H.; Ishida, K.; Michioka, C.; Yoshimura, K.; Takada, K.; Sasaki, T.; Sakurai, H.; Takayama-Muromachi, E.

2007-11-01

57

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

NASA Astrophysics Data System (ADS)

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, Y.; Roy, B.; Ran, S.; Bud'ko, S. L.; Canfield, P. C.

2014-03-01

58

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

59

A zero-field NQR and low-field NMR study of NaHF 2 and KHF 2  

NASA Astrophysics Data System (ADS)

The quadrupole coupling constants and asymmetry parameters have been measured for 23Na in NaHF 2 and NaDF 2 and an estimate obtained for the quadrupole coupling constant of 39K in KHF 2 using nuclear quadrupole double-resonance (NQDR) techniques. Both fluorine and hydrogen were used as the detecting nuclear species. Using the same field-cycling techniques as are used in NQDR the very low field NMR of the HF2- ion was measured. By a comparison of theory with experiment it was possible to deduce a F-H bond length of 0.115(1) nm for KHF 2 and 0.113(l) nm for NaHF 2.

Gosling, P.; Edmonds, D. T.; Rabbani, S. R.

60

^7Li NMR and ^139L NQR in La_2Cu_1.985Li_0.015Cu0_4  

NASA Astrophysics Data System (ADS)

In Li doped La_2CuO4 the Li substitutes in the Cu site and introduces holes which, unlike the Sr doping, are localized. However, the effect of Li doping on the antiferromagnetic transition is much like that of Sr in that the transition is rapidly depressed at low doping concentrations and disappears at 3-4been measured in a 1.5line shows only a small increase in T2 below the transition over that at 300 K, considerably less than the nearest neighbor dipole contribution. The values of T1 also show no dramatic difference above and below the transition. However, the ^139La NQR data show the expected splitting by an internal field below the ordering temperature. This is consistent with the possibility that the the exchange coupling between nearest neighbor Cu's is modified to the extent that they do not participate in the antiferromagnetic order. Complete temperature dependent data of T1 and T2 will be presented.

Kleinhammes, A.; Kuhns, P. L.; Moulton, W. G.; Sarrao, J. L.; Fisk, Cassidy; Sullivan, Z.

1996-03-01

61

A study of the semiconductor compound ?uAlO2 by the method of nuclear quadrupole resonance of Cu  

NASA Astrophysics Data System (ADS)

The method of nuclear quadrupole resonance of Cu (NQR Cu) is used to study the samples of a semiconductor compound CuAlO2. The crystal structure of CuAlO2 belongs to the family of delafossite - the mineral of a basic CuFeO2 structure. Transparent semiconductor oxides, such as CuAlO2, have attracted recent attention as promising thermoelectric materials.

Matukhin, V. L.; Khabibulin, I. Kh.; Shul'gin, D. A.; Smidt, S. V.

2012-07-01

62

Intensity of N and P signals of a two dimensional two-particle NQR spectrum (J=1)  

SciTech Connect

We calculate the intensities and phases of the N and P peaks of a 2D NMR spectrum under two-frequency excitation during preparation and mixing by means of simultaneous radio-frequency pulses with repetition frequencies close to those of adjacent transitions of the nuclear species studied. The 2D spectrum is shown to contain up to four cross-peaks, in addition to the two diagonal peaks.

Sinyavskii, N.A.; Grechishkin, V.S.; Shelukhina, S.F. [Kaliningrad State Univ. (Russian Federation)

1995-12-01

63

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

2008-10-21

64

59Co Nuclear Quadrupole Resonance Studies of Superconducting and Nonsuperconducting Bilayer Water Intercalated Sodium Cobalt Oxides NaxCoO2\\cdotyH2O  

NASA Astrophysics Data System (ADS)

We report 59Co nuclear quadrupole resonance (NQR) studies of bilayer water intercalated sodium cobalt oxides NaxCoO2\\cdotyH2O (BLH) with the superconducting transition temperatures, 2 K < Tc ? 4.6 K, as well as a magnetic BLH sample without superconductivity. We obtained a magnetic phase diagram of Tc and the magnetic ordering temperature TM against the peak frequency ?3 of the 59Co NQR transition Iz = ± 5/2 ?ftrightarrow ± 7/2 and found a dome-shaped superconducting phase. The 59Co NQR spectrum of the nonsuperconducting BLH shows a broadening below TM without the critical divergence of 1/T1 or 1/T2, suggesting an unconventional magnetic ordering. The degree of enhancement of 1/T1T at low temperatures increases with the increase of ?3 though the optimal ?3 of approximately 12.30 MHz. In the NaxCoO2\\cdotyH2O system, the optimal-Tc superconductivity emerges close to the magnetic instability. Tc is suppressed near the phase boundary at ?3 ˜ 12.50 MHz, which is not a conventional magnetic quantum critical point.

Michioka, C.; Ohta, H.; Itoh, Y.; Yoshimura, K.

2006-06-01

65

NQR-NMR studies of higher alcohol synthesis Cu-Co catalysts. Quarterly technical progress report, September 14--December 15, 1990  

SciTech Connect

Copper and cobalt are the key elements in syngas conversion catalyst systems used for higher alcohol synthesis. Their proximity and synergy sensitively control the selectivity and efficiency of the process. It is believed that their outer electronic charge distribution which is responsible for their electrical and magnetic properties might be governing their catalytic properties also. To examine the correlation between catalytic and magnetic properties, a series of copper cobalt catalysts (Co/Cu ratio 5:1 to 5:5) with and without a support were prepared. The nuclear quadrupole resonance spectrum of copper and (zero-field) nuclear magnetic resonance spectrum of cobalt and magnetization and hysteresis character of the catalyst were analyzed. Similar to the catalytic results, the magnetic results also were found to be very sensitive to the preparation technique. The results indicate possible electron exchange between copper and cobalt, and cobalt and the support Titania.

Not Available

1991-01-14

66

Topology of the interactions pattern in pharmaceutically relevant polymorphs of methylxanthines (caffeine, theobromine, and theophiline): combined experimental ((1)h-(14)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-A2A 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; Zagar, Veselko

2014-09-22

67

Spin diffusion of dipolar energy in NQR.  

PubMed

The theory of spin diffusion was extended to the case of nuclear dipolar order in solids containing paramagnetic impurities and nuclei with spin I > 1/2 having nuclear quadrupole moment. We show that spin diffusion process of dipolar order takes place in solids containing paramagnetic impurities. At the start of relaxation process, the direct relaxation regime is realized with non-exponential time dependence. Then the relaxation regime will be changed to diffusion-limited one. Using obtained expressions for the spin lattice relaxation times for these two relaxation regimes, the diffusion coefficient of the dipolar order in nuclear quadrupole resonance can be estimated from experimental data. PMID:10868572

Furman, G B; Goren, S D

2000-06-01

68

NMR study of strongly correlated electron systems  

Microsoft Academic Search

Various types of ground states in strongly correlated electron systems have been systematically investigated by means of NMR\\/NQR at low temperatures under high magnetic field and pressure. We focus on two well-known heavy-electron families, CeCu2X2 (X = Si and Ge) (Ce(122)) and UM2Al3 (M = Ni and Pd) (U(123)). The Cu NQR experiments on CeCu2X2 under high pressure indicate that

Y. Kitaoka; H. Tou; G.-q. Zheng; K. Ishida; K. Asayama; T. C. Kobayashi; A. Kohda; N. Takeshita; K. Amaya; Y. Onuki; G. Geibel; C. Schank; F. Steglich

1995-01-01

69

Undergraduate research studies program at participating institutions of the HBCU Fossil Energy Consortium. Final report  

SciTech Connect

The primary objective of this research program is to expose students in the Historically Black Colleges and Universities (HBCU) Fossil Energy Consortium Institutions to energy and fossil fuels research, to stimulate their interest in the sciences and engineering and to encourage them to pursue graduate studies. This report provides the research accomplishment of the various students who participated in the program. Research results are presented on the following topics: Energy Enhancement and Pollutant Reduction in Coal by Cryogenic Diminution; Competition of NO and SO{sub 2} for OH Generated witin Electrical Aerosol Analyzers; Dispersed Iron Catalysts for Coal Gasification; NQR/NMR Studies of Copper-Cobalt Catalysts for Syngas Concersion; Catalytic gasification of Coal Chars by Potassium Sulfate and Ferrous Sulfate Mixtures; A New Method for Cleaning and Beneficiation of Ultrafine Coal; Characterization Studies of Coal-Derived Liquids; Study of Coal Liquefaction Catalysts and Removal of Certain Toxic Heavy Metal Ions from Coal Conversion Process Wastewaters.

Bota, K.B.

1991-12-31

70

Undergraduate research studies program at participating institutions of the HBCU Fossil Energy Consortium  

SciTech Connect

The primary objective of this research program is to expose students in the Historically Black Colleges and Universities (HBCU) Fossil Energy Consortium Institutions to energy and fossil fuels research, to stimulate their interest in the sciences and engineering and to encourage them to pursue graduate studies. This report provides the research accomplishment of the various students who participated in the program. Research results are presented on the following topics: Energy Enhancement and Pollutant Reduction in Coal by Cryogenic Diminution; Competition of NO and SO[sub 2] for OH Generated witin Electrical Aerosol Analyzers; Dispersed Iron Catalysts for Coal Gasification; NQR/NMR Studies of Copper-Cobalt Catalysts for Syngas Concersion; Catalytic gasification of Coal Chars by Potassium Sulfate and Ferrous Sulfate Mixtures; A New Method for Cleaning and Beneficiation of Ultrafine Coal; Characterization Studies of Coal-Derived Liquids; Study of Coal Liquefaction Catalysts and Removal of Certain Toxic Heavy Metal Ions from Coal Conversion Process Wastewaters.

Bota, K.B.

1991-01-01

71

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

72

Electron diffraction study of La{sub 2}Li{sub O.5}Cu{sub O.5}O{sub 4}  

SciTech Connect

La{sub 2}Li{sub 0.5}Cu{sub 0.5}O{sub 4} has been investigated by electron diffraction and high resolution electron microscopy at room temperature. Ordering between Li and Cu cations is fairly perfect within the ({anti a}, {anti c}) plane but there is disorder between Cu and Li cations along the {anti b} axis. The detection of weak reflections which violate the C centering of the Cmmm space group (initially proposed for this compound), indicates that the crystal symmetry allows lattice distortions. The evolution of the structure as a function of the temperature may lead to determine whether the low energy singlet-triplet excitation, found in NMR/NQR studies, is coupled with lattice distortions.

Moshopoulou, E.; Thompson, J.D.; Sarrao, J.L. [Los Alamos National Lab., NM (United States). Condensed Matter and Thermal Physics Group; Fisk, Z. [National High Magnetic Field Lab., Tallahassee, FL (United States)]|[Florida State Univ., Tallahassee, FL (United States)

1998-03-01

73

a Nuclear Magnetic Resonance and a Nuclear Quadrupole Resonance Study of the Phases and Solid State Transformations in the Alkali Metal Hydroxides - Lithium-Hydroxide Sodium - Potassium-Hydroxide Rubidium-Hydroxide Cesium - and Cesium-Hydroxide - Water.  

NASA Astrophysics Data System (ADS)

The proton NMR lineshapes for all alkali metal hydroxides, except LiOH, have a weak doublet structure (most pronounced in KOH). This structure was explained by modelling the arrangement of hydrogen atoms with a 4 -spin planar zig-zag chain. The second moments of proton NMR recorded at 27 MHz and at 295 K are 8.8, 10.8, 6.5, 4.8 and 4.1 (gauss)('2) for LiOH, NaOH, KOH, RbOH and CsOH respectively. The phase diagram for NaOH and Na(,2)CO(,3) has been reviewed and appended using DTA results. The NMR of ('23)NaOH (QCC = 3.52 (+OR-) 0.06 MHz and (eta) < 0.04 at 295 K) has been measured from 77 K to 570 K. The temperature dependence of the NQR of ('23)NaOH, studied from 77 K to 550 K, shows a change in slope and a discontinuous change in NQR frequency of 6 (+OR-) 2 kHz on crossing from the orthorhombic to monoclinic phases. At 292 K, the sodium NQR frequency was 1.778 (+OR-) 0.001 MHz. The DTA and NQR results for ('23)NaOD show a phase transition at 160 K with an enthalpy change of 200 (+OR-) 75 J/mol. There is no corresponding transition in NaOH above 110 K. The deuterium NMR in NaOD was studied from 293 K to 570 K (QCC = 245 (+OR-) 2 kHz and (eta) = 0.05 (+OR-) 0.01 at 293 K). The decrease in deuterium QCC with increasing temperature was fitted to a librating molecule model and confirmed that the frequency of the OD('-) libration decreases in the monoclinic phase. The proton NMR linewidth in NaOH narrows from 10 gauss FWHM at 295 K to 1 gauss at 550 K due to proton conduction. The proton T(,1) (T(,1) = 300 sec. at 41 MHz and 293 K) decreases with increasing temperature and is extremely dependent on H(,2)O content. From the NMR of ('87)RbOH at 293 K, it was estimated that QCC = 9 (+OR-) 1 MHz. The ('133)Cs NMR in CsOH(.)H(,2)O was studied from 230 K to 470 K. At 293 K, QCC = 101 (+OR -) 2 kHz with (eta) = 0. The ('133)Cs NMR changes at the 232 K transition but varies smoothly through the 340 K transition in CsOH(.)H(,2)O. The unusual deuterium quadrupole coupling for the OD('-) ion in CsOD (QCC = 143 (+OR-) 2 kHz, (eta) = 0.66 (+OR-) 0.01 at 295 K) indicates that the OD('-) ion is orientationally disordered, with two equivalent deuterium sites in the orthorhombic phase. Below 247 K in CsOD (232 K in CsOH), the deuterium NMR suggests that the OD('-) ions are not orientationally disordered.

Amm, David Thomas

74

Nuclear Quadrupole Resonance Study of the Nitrogen Mustards and Local Anesthetics.  

NASA Astrophysics Data System (ADS)

The density matrix description of pulsed nitrogen -14 nuclear quadrupole resonance (NQR) spin-echoes is presented. The parallel between this problem, when formulated in terms of the fictitious spin- 1/2 operators, and that of spin - 1/2 NMR spin-echoes in liquids is discussed along with the complications which arise in multiple-pulse NQR experiments in powders due to the random orientation of the electric field gradient tensors. The equipment and procedures involved in searching for, detecting and identifying NQR resonances using pulsed techniques are described. The ('14)N NQR spectra of several nitrogen mustard compounds in the solid state are reported and analyzed in the framework of the Townes and Dailey theory. For the aniline derivatives, a correlation exists between l -(sigma), l being the nitrogen lone-pair electron density and (sigma) the average N-C sigma bond electron density, and the enhanced Hammett sigma constant (sigma)('-). An improved correlation is obtained between l-(sigma) and (sigma)(,R)('-), which emphasizes the importance of resonance effects in determining l-(sigma). The increase of hydrolysis and alkylation rates with increasing values of l-(sigma) is in agreement with the identification of the cyclic immonium ion as the intermediate in the hydrolysis and alkylation processes of the aromatic nitrogen mustards. A possible correlation is noted between the ('35)Cl NQR spectra for some of the mustards and measures of toxic and antitumor activity. ('14)N NQR spectra for several local anesthetics in the solid state are also reported and analyzed using the Townes and Dailey approach. The changes in the electron distributions at various nitrogen sites, produced by protonating the tertiary amino nitrogen, are discussed and shown to be in general agreement with expectations bases on the increased electrophilic character of the protonated amino group.

Buess, Michael Lee

75

Role of NAD(P)H:quinone oxidoreductase encoded by drgA gene in reduction of exogenous quinones in cyanobacterium Synechocystis sp. PCC 6803 cells.  

PubMed

Insertion mutant Ins2 of the cyanobacterium Synechocystis sp. PCC 6803, lacking NAD(P)H:quinone oxidoreductase (NQR) encoded by drgA gene, was characterized by higher sensitivity to quinone-type inhibitors (menadione and plumbagin) than wild type (WT) cells. In photoautotrophically grown cyanobacterial cells more than 60% of NADPH:quinone-reductase activity, as well as all NADPH:dinoseb-reductase activity, was associated with the function of NQR. NQR activity was observed only in soluble fraction of cyanobacterial cells, but not in membrane fraction. The effects of menadione and menadiol on the reduction of Photosystem I reaction center (P700(+)) after its photooxidation in the presence of DCMU were studied using the EPR spectroscopy. The addition of menadione increased the rate of P700(+) reduction in WT cells, whereas in Ins2 mutant the reduction of P700(+) was strongly inhibited. In the presence of menadiol the reduction of P700(+) was accelerated both in WT and Ins2 mutant cells. These data suggest that NQR protects the cyanobacterial cells from the toxic effect of exogenous quinones by their reduction to hydroquinones. These data may also indicate the probable functional homology of Synechocystis sp. PCC 6803 NQR with mammalian and plant NAD(P)H:quinone oxidoreductases (DT-diaphorases). PMID:15000679

Elanskaya, I V; Grivennikova, V G; Groshev, V V; Kuznetsova, G V; Semina, M E; Timofeev, K N

2004-02-01

76

Multipulse sequences for explosives detection by NQR under conditions of magnetoacoustic and piezoelectric ringing  

Microsoft Academic Search

A number of methods for cancelling magnetoacoustic and piezoelectric ringing signals in the spectroscopy of the nuclear quadrupole\\u000a resonance are presented. The suggested methods include using the sequence (?0)?-(?-?x-2?-?\\u000a y\\u000a -2?-??x\\u000a -2?-??y\\u000a -?)\\u000a n\\u000a and a multipulse analog of the two-pulse Hahn sequence with the first pulse replaced by a short steady-state sequence. Another\\u000a method presented is the method of

V. T. Mikhaltsevitch; T. N. Rudakov; J. H. Flexman; P. A. Hayes; W. P. Chisholm

2004-01-01

77

IMPLEMENTATION OF A -NQR SYSTEM AT THE NSCL FOR GROUND STATE QUADRUPOLE MOMENT  

E-print Network

of multi-radio frequencies, high rf magnetic field strength, short rf application time due to the short.2 Implantation of nuclei and preservation of polarization in a host crystal 13 2.3 Hyperfine interactions

Mantica, Paul F.

78

OXYGEN-17 and BARIUM-135,137 NMR Study of Oxide Superconductors  

NASA Astrophysics Data System (ADS)

A series of oxide superconductors and related compounds, including: BaPbO_3, BaBiO _3, BaSb_{0.25 }Pb_{0.75}O _3, BaBi_{0.25 }Pb_{0.75}O _3, Ba_{0.6} K_{0.4}BiO _3, Bi_2Sr _2CuO_{rm 6 + x }, La_{1.85}Ca _{0.15}CuO_ {rm 4-x}, La_{1.85 }Sr_{0.15}CuO _{rm 4-x}, Bi _2Sr_2CaCu _2O_{rm 8 + x}, YBa_2Cu_3 O_{rm 7-x}, and Tl_2Ba_2CaCu _2O_{rm 8 + x}, were studied using solid state ^{17}O and ^{135,137 }Ba nuclear magnetic resonance (NMR) spectroscopy. The measurements are related to the compounds' atomic, electronic and magnetic structures. The ^{17 }O NMR results indicate that most of the oxide superconductors are inhomogeneous, and have longitudinal relaxation mechanisms that are magnetic in origin. Variable temperature measurements of the bismuthate and plumbate materials are consistent with the relaxation being dominated by the oxygen 2p character of the conduction band. While similar measurements of the CuO_2 planar oxygen, of the cuprates, indicate that their relaxation is dominated by a contact interaction. The relaxation rates of the bismuthate and plumbates vary with T _{rm c}, consistent with a relation derived from the Bardeen-Cooper-Scheifer (BCS) theory of superconductivity. The relaxation rates of the cuprates are fairly constant (T_1T ~ 3.9 +/- 1.5 sK), even though the transition temperatures range from 5.6 to 95 K. Finally, from a comparison with the copper relaxation measurements of other groups, it is determined that the copper spin fluctuations are localized near the reciprocal lattice vector (pi/a, pi/a). From ^{135,137}Ba NMR and NQR measurements of YBa_2Cu _3O_{rm 7-x}, the electric field gradient is determined and found to be consistent with ab initio calculations. Also, it is determined from variable temperature relaxation measurements, that the barium site is effected by the CuO_2 planar spin fluctuations.

Shore, Jay Sanford

79

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

80

High precision measurement of the 11Li and 9Li quadrupole moment ratio using zero-field ?-NQR  

NASA Astrophysics Data System (ADS)

The ratio of electric quadrupole moments of 11Li and 9Li was measured using the zero-field ?-detected nuclear quadrupole resonance technique at Triumf-Isac. The precision on the ratio Q11/Q9 = 1.0775(12) was improved by more than one order of magnitude and an absolute value for the quadrupole moment of 11Li was inferred. Systematic effects, as argued here, are not expected to contribute to the ratio on this scale. The zero-field spin-lattice relaxation time for 8Li implanted within SrTiO3 at 295?K in zero-field was found to be T1 = 1.73(2)?s. A comparison of the quadrupole moments of 9, 11Li and their ratio is made with the latest models, however, no conclusion may yet be drawn owing to the size of the theoretical uncertainties.

Voss, A.; Pearson, M. R.; Buchinger, F.; Crawford, J. E.; Kiefl, R. F.; Levy, C. D. P.; MacFarlane, W. A.; Mané, E.; Morris, G. D.; Shelbaya, O. T. J.; Song, Q.; Wang, D.

2014-01-01

81

63,65Cu Nuclear Resonance Study of the Coupled Spin Dimers and Chains Compound Cu2Fe2Ge4O13  

NASA Astrophysics Data System (ADS)

Nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) of Cu have been measured in a coupled spin dimers and chains compound Cu2Fe2Ge4O13. Cu NQR has also been measured in an isostructural material Cu2Sc2Ge4O13 including only spin dimers. Comparison of the temperature dependence of the 63Cu nuclear spin--lattice relaxation rate between the two compounds reveals that the Fe chains in Cu2Fe2Ge4O13 do not change a spin gap energy of the Cu dimers from that in Cu2Sc2Ge4O13, contributing additionally to the relaxation rate at the Cu site. A modestly large internal field of 3.39 T was observed at the Cu site in the antiferromagnetic state of Cu2Fe2 Ge4O13 at 4.2 K, which is partly because of quantum reduction of the ordered moment of a Cu atom. The internal field and the ordered moment of Cu are noncollinear due to large anisotropy of the hyperfine interaction at the Cu site. A model analysis of the internal field based on the fourfold planar coordination of Cu suggests that a 3d hole of the Cu2+ ion is mainly in the d(x2-y2) orbital state.

Kikuchi, Jun; Nagura, Shiro; Murakami, Kazumasa; Masuda, Takatsugu; Redhammer, Günther J.

2013-03-01

82

Deuterium and sodium quadrupole interactions in sodium hydroxide. II. The monoclinic phase  

NASA Astrophysics Data System (ADS)

The temperature dependence of the 23NaOH pure quadrupole resonance (NQR) frequency has been studied from 77 to 550 K and shows a change in slope and a discontinuous change in frequency of 6±2 kHz at the orthorhombic to monoclinic phase transition at 505 K. At 292 K the 23Na NQR frequency is 1.778±0.001 MHz, ?<0.04. The temperature dependence of the deuterium quadrupole coupling was fit to a librating molecule model between 293 and 570 K (QCC=245±2 kHz, ?=0.05±0.01 at 293 K) and confirms that the frequency of the OD- libration decreases in the high temperature monoclinic phase.

Amm, D. T.; Segel, S. L.; Bastow, T. J.; Jeffrey, K. R.

1986-01-01

83

New technologies: nuclear quadrupole resonance as an explosive and narcotic detection technique  

Microsoft Academic Search

Possibilities of detecting nuclear quadrupole resonance (NQR) signals in explosives and drugs are considered. Direct and indirect NQR techniques for searching substances are described and the potentialities of various experimental methods are compared.

Vadim S Grechishkin; Nikolai Ya Sinyavskii

1997-01-01

84

AMERICAN STUDIES &AMERICAN STUDIES &AMERICAN STUDIES & ETHNICITYETHNICITYETHNICITY  

E-print Network

AMERICAN STUDIES &AMERICAN STUDIES &AMERICAN STUDIES & ETHNICITYETHNICITYETHNICITY This major: Introduction to American Studies and Ethnicity -- Introduction to American studies and ethnic studies. Provides American, Asian American, and Chicano/ Latino cultures and social patterns. AMST 320: Social Construction

Krylov, Anna I.

85

Africana Studies Film Studies  

E-print Network

CLAREMONT WEST 116TH STREET HEWITT BROOKS REID LEHMAN ALTSCHUL THE DIANA CENTER LEHMAN LAWN MILBANK COURTYARD LEHMAN LAWN Architecture Art History Classics & Ancient Studies Music Philosophy Religion DIANA Studies ARTHUR ROSS COURTYARD In the event of rain, this reception will relocate to Lehman Lawn. Chemistry

86

STUDY ABROAD STUDY ABROAD  

E-print Network

, College of Liberal Arts #12;QUESTIONS · What classes must I complete on campus for my degree? · What core contact Financial Services. Visit: world.utexas. edu/abroad/funding · How do loans work for study abroad? What kinds of aid/loans do I currently receive, and are there any restrictions on this aid if I study

Johnston, Daniel

87

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.

88

72 American Studies American Studies  

E-print Network

72 · American Studies American Studies PROFESSORS Aday, Barnes, Blakey (National Endowment for the Humanities Professor of Anthropology and American Studies) Donaldson (National Endowment for the Humanities Professor of English and American Studies), Gundaker (Director of Graduate Studies; Dittman Professor

Lewis, Robert Michael

89

American studies Why American studies?  

E-print Network

American studies Why American studies? The US is the sole superpower in the 21st century and its may live. Studying American history, culture and society in the context of the Americas provides much What American studies courses are there? American Studies American Studies and English American Studies

Sussex, University of

90

American studies Why American studies?  

E-print Network

American studies Why American studies? The United States (US) remains a superpower in the 21st pervasive and important the influence of the US is, American studies offers you the opportunity to think. Essentials Courses BA (Hons) in American Studies BA (Hons) in American Studies and English BA (Hons

Sussex, University of

91

Funded Studies  

Cancer.gov

Funded Studies To date, 34 studies have been funded as part of the BIQSFP program: Type of Study FY Approved Integral/ Integrated Coop Group/ CCOP Study Number Phase Concept Title Cancer Site Biomarker 2014 Integral Alliance A071102 II-III

92

Nuclear quadrupole resonance: a technique to control hydration processes in the pharmaceutical industry.  

PubMed

Pharmaceuticals can exist in many solid forms, which can have different physical and chemical properties. These solid forms include polymorphs, solvates, amorphous, and hydrates. Particularly, hydration process can be quite common since pharmaceutical solids can be in contact with water during manufacturing process and can also be exposed to water during storage. In the present work, it is proved that NQR technique is capable of detecting different hydrated forms not only in the pure raw material but also in the final product (tablets), being in this way a useful technique for quality control. This technique was also used to study the dehydration process from pentahydrate to trihydrate. PMID:21314133

Limandri, Silvina; Visñovezky, Claudia; Pérez, Silvina C; Schurrer, Clemar A; Wolfenson, Alberto E; Ferro, Maribel; Cuffini, Silvia L; de Souza, Joel Gonçalves; Aguiar, F Armani; de Gaitani, C Masetto

2011-03-01

93

Structure and transport properties of stephanite (Ag5SbS4) according to antimony nuclear quadrupole resonance  

NASA Astrophysics Data System (ADS)

Silver sulfo-antimonide Ag5SbS4 (stephanite) has been studied by nuclear quadrupole resonance (NQR) spectroscopy on antimony nuclei. The temperature dependences of the spectroscopic and relaxation parameters have been examined in the range of 4.2-395 K. A phase transition at 140 K and internal motions with an activation energy of 0.29 eV have been experimentally detected. The nature of the phase transition and diffusion of silver ions has been discussed in view of the reported data.

Orlova, A. Yu.; Gainov, R. R.; Dooglav, A. V.; Pen'kov, I. N.; Korolev, E. A.

2012-11-01

94

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

95

Investigation of intermolecular hydrogen bond interactions in crystalline L-cysteine by DFT calculations of the oxygen-17, nitrogen-14, and hydrogen-2 EFG tensors and AIM analysis.  

PubMed

A systematic computational study is carried out to investigate hydrogen bond (HB) interactions in the real crystalline structures of L-cysteine at 30 and 298 K by density functional theory (DFT) calculations of electric field gradient (EFG) tensors at the sites of O-17, N-14, and H-2 nuclei. One-molecule (monomer) and nine-molecule (cluster) models of L-cysteine are created by available crystal coordinates at both temperatures and the EFG tensors are calculated for both models to indicate the effect of HB interactions on the tensors. The calculated EFG tensors at the level of B3LYP and B3PW91 DFT methods and 6-311++G** and cc-pVTZ basis sets are converted to those experimentally measurable nuclear quadrupole resonance (NQR) parameters i.e. quadrupole coupling constants (qcc) and asymmetry parameters (eta(Q)). The evaluated NQR parameters reveal that the EFG tensors of (17)O, (14)N, and (2)H are influenced and show particular trends from monomer to the target molecule in the cluster due to the contribution of target molecule to classic N-H...O, and non-classic S-H...O and S-H...S types of HB interactions. On the other hand, atoms in molecules (AIM) analyses confirm the presence of HB interactions and rationalize the observed EFG trends. The results indicate different contribution of various nuclei to HB interactions in the cluster where O2 and N1 have major contributions. The EFG tensors as well as AIM analysis at the H6 site show that the N1-H6...O2 HB undergoes a significant change from 30 to 298 K where changes in other N-H...O interactions are almost negligible. There is a good agreement between the calculated (14)N NQR parameters and reported experimental data. PMID:19168275

Nozad, Ahmad G; Meftah, Sakineh; Ghasemi, Mohammad H; Kiyani, Roya A; Aghazadeh, Mustafa

2009-04-01

96

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

97

Intelligence Studies  

ERIC Educational Resources Information Center

To make an academic study of matters inherently secret and potentially explosive seems a tall task. But a growing number of scholars are drawn to understanding spycraft. The interdisciplinary field of intelligence studies is mushrooming, as scholars trained in history, international studies, and political science examine such subjects as the…

Monaghan, Peter

2009-01-01

98

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

99

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

100

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; Daniels, John E.; Kapenga, J. A.; Mckean, Joe W.

2008-12-25

101

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...

102

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

103

Prayer Study  

NSDL National Science Digital Library

Students read an article about a study of the effects of intercessory prayer on cardiac patients published in a renowned medical journal. After reading the case and discussing the questions in small groups, students evaluate the study for its scientific validity and defend their reasoning.

Gallucci, Kathy

2004-02-01

104

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.

105

Study Stack  

NSDL National Science Digital Library

Developed by John Weidner, the Study Stack concept basically assists individuals to memorize information about various subjects, including geography, history, math, languages, and science. Users of the site can select one of the existing stacks, which consists of virtual study cards allowing individuals to learn at their own pace until they are satisfied with their progress. What is also particularly novel about this learning tool is that data entered for customized study stacks can be automatically displayed as a matching game, a word search puzzle, or a hangman game. So far, the site contains dozens of study stacks for each subject, with the areas dedicated to math and science containing quite a number of rather helpful stacks. With its wide range of applications, this site will be very helpful to students at different age levels and teachers who may be seeking to develop a new study tool for any number of topics or themes within a subject area.

Weidner, John

106

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.

107

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.

108

Alternative Pyrimidine Biosynthesis Protein ApbE Is a Flavin Transferase Catalyzing Covalent Attachment of FMN to a Threonine Residue in Bacterial Flavoproteins*  

PubMed Central

Na+-translocating NADH:quinone oxidoreductase (Na+-NQR) contains two flavin residues as redox-active prosthetic groups attached by a phosphoester bond to threonine residues in subunits NqrB and NqrC. We demonstrate here that flavinylation of truncated Vibrio harveyi NqrC at Thr-229 in Escherichia coli cells requires the presence of a co-expressed Vibrio apbE gene. The apbE genes cluster with genes for Na+-NQR and other FMN-binding flavoproteins in bacterial genomes and encode proteins with previously unknown function. Experiments with isolated NqrC and ApbE proteins confirmed that ApbE is the only protein factor required for NqrC flavinylation and also indicated that the reaction is Mg2+-dependent and proceeds with FAD but not FMN. Inactivation of the apbE gene in Klebsiella pneumoniae, wherein the nqr operon and apbE are well separated in the chromosome, resulted in a complete loss of the quinone reductase activity of Na+-NQR, consistent with its dependence on covalently bound flavin. Our data thus identify ApbE as a novel modifying enzyme, flavin transferase. PMID:23558683

Bertsova, Yulia V.; Fadeeva, Maria S.; Kostyrko, Vitaly A.; Serebryakova, Marina V.; Baykov, Alexander A.; Bogachev, Alexander V.

2013-01-01

109

Videourodynamic studies.  

PubMed

Videourodynamic evaluation that incorporates radiographic imaging with simultaneous measurement of bladder and urethral pressure is the most precise method available for diagnosing complex incontinence and voiding disorders. In addition, videourodynamics has been instrumental to the development of our present knowledge about urethral and bladder function including the concepts of detrusor and abdominal leak point pressures. Although these studies are more expensive and time consuming, the authors have found videourodynamic evaluation indispensable when the diagnosis remains in question after simple urodynamics and when the studies and clinical scenario do not agree. PMID:8659029

McGuire, E J; Cespedes, R D; Cross, C A; O'Connell, H E

1996-05-01

110

Studying Adolescence  

Microsoft Academic Search

Young people in their teens constitute the largest age group in the world, in a special stage recognized across the globe as the link in the life cycle between childhood and adulthood. Longitudinal studies in both developed and developing countries and better measurements of adolescent behavior are producing new insights. The physical and psychosocial changes that occur during puberty make

Linda M. Richter

2006-01-01

111

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

112

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

113

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

114

Electrophysiologic Study  

PubMed Central

Studies have shown the predictive value of inducible ventricular tachycardia and clinical arrhythmia in patients who have structural heart disease. We examined the possible predictive value of electrophysiologic study before the placement of an implantable cardioverter-defibrillator. Our retrospective study group comprised 315 patients who had ventricular tachycardia that was inducible during electrophysiologic study and who had undergone at least 1 month of follow-up (247 men; mean age, 66.9 ± 13.5 yr; mean follow-up, 24.9 ± 14.8 mo). Recorded characteristics included induced ventricular tachycardia cycle length, atrio-His and His-ventricular electrograms, PR and QT intervals, QRS duration, and drug therapy. Of the 315 patients, 97 experienced ventricular arrhythmia during the follow-up period, as registered by 184 of more than 400 interrogations. There were 187 episodes of ventricular arrhythmia (tachycardia, 178; fibrillation, 9) during 652.5 person-years of follow-up. Subjects with a cycle length ?240 msec were more likely to have an earlier 1st arrhythmia than those with a cycle length <240 msec (P=0.032). A quarter of the subjects with a cycle length ?240 msec had their 1st arrhythmia by 19.14 months, compared with 23.8 months for a quarter of the subjects with a cycle length <240 msec (P <0.032). Among the electrophysiologic characteristics examined, inducible ventricular tachycardia with a cycle length ?240 msec is predictive of appropriate implantable cardioverter-defibrillator therapy at an earlier time. This may have prognostic implications that warrant implantable cardioverter-defibrillator programming to enable appropriate antitachycardia pacing in this group of patients. PMID:20548804

Gold, Daniel R.; Catanzaro, John N.; Makaryus, John N.; Waldman, Cory; Sauer, William H.; Sison, Cristina; Makaryus, Amgad N.; Altman, Erik; Jadonath, Ram; Beldner, Stuart

2010-01-01

115

Blastoid studies  

E-print Network

was polished and etched with 5-percent hydro- chloric acid and allowed to dry. Camera lucida draw- ings were made of the section itself, and for additional record, peel sections were prepared by immersing the slightly etched surface in acetone and pressing.... For later studies at the University of Oklahoma, the camera lucida was used in recording features of thin sections, polished sections, and details of exter- nally visible morphologic parts. The following data are presented to show the results of morphologic...

Fay, R. O.

1961-10-30

116

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

117

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

118

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.

119

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

120

Plague studies*  

PubMed Central

The author examines in detail the symptomatology, diagnosis, and treatment of plague, and outlines the problem of the length of the incubation period. The clinical features commonly met with in all severely-affected plague patients, regardless of the primary localization of the infection, are described. The author then deals with the symptomatology and manifestations of bubonic plague as compared to those of primary pneumonic plague. The importance of a clinical diagnosis, from the point of view of prevention, is stressed, and the differential diagnosis of various forms of the disease is described. The study contains a detailed discussion of the respective merits of antibiotic treatment, serotherapy, and sulfonamide treatment. The author points out that the outstanding success of streptomycin and some other antibiotics will probably relegate the sulfonamides to the second rank in the treatment of bubonic plague. PMID:13082390

Pollitzer, R.

1953-01-01

121

Ultrasound studies.  

PubMed

This article focuses on the clinical use of ultrasound with the obstetric, gynecologic, and trauma patient by reviewing recent case studies of the use of ultrasound for diagnostic purposes. The article also summarizes the American Institute of Ultrasound in Medicine (AIUM) guidelines for use in several types of patients. The AIUM is a multidisciplinary association whose purpose is to "advance the art and science of ultrasound in medicine and research through educational, scientific, literary, and professional activities." The organization provides guidelines in conjunction with many professional organizations, such as the American College of Cardiology and the American College of Obstetrics and Gynecology. AIUM also serves as an accrediting body for ultrasound practices. PMID:20193883

Smith-Francis, Melan; Orr, Patty

2010-03-01

122

Nutritional studies  

NASA Technical Reports Server (NTRS)

Detailed metabolic studies were conducted of the Apollo 16 and Apollo 17 flight crews, and the results are presented in tabular form. Intake and absorption data are also included. Apollo nutrient intakes were found to be characteristically hypocaloric. Estimates of body composition changes from metabolic balance data, from preflight and postflight weights and volumes, and from total body water and potassium provide no evidence for diminished caloric requirements during a flight. As observed during the Gemini Program and during periods of bed rest, measurements of bone density and metabolic balance confirm a tendency toward loss of skeletal tissue in weightlessness. No evidence exists that any inflight metabolic anomaly, including hypokalemia, was induced by marginal or deficient nutrient intakes. In general, the Apollo crewmen were well nourished and exhibited normal gastroenterological functions, although appetite was somewhat diminished and the organoleptic response to food was somewhat modified during flight.

Rambaut, P. C.; Smith, M. C., Jr.; Wheeler, H. O.

1975-01-01

123

Cholera studies*  

PubMed Central

The first section of this study deals with areas where cholera is endemic and with the conditions normally favouring endemicity. Turning next to epidemics, the author discusses their origin and types, climatic influences on them, their periodicity and the possibility of forecasting them, the role played in them by different serological races of V. cholerae, and the causes of their decline. In a section on the factors governing the local spread of cholera, he considers contact and water-borne infection; the role of contaminated food and drink, of fomites, of flies, and of carriers; and the incidence according to sex, age, race, and occupation. The last part deals with factors governing the spread of cholera over longer distances, and includes discussion of the effect of movements of individuals and groups and of assemblies of the population on pilgrimages or at religious festivals. PMID:13472431

Pollitzer, R.

1957-01-01

124

Systems Studies  

SciTech Connect

The Systems Studies Activity had two objectives: (1) to investigate nontechnical barriers to the deployment of biomass production and supply systems and (2) to enhance and extend existing systems models of bioenergy supply and use. For the first objective, the Activity focused on existing bioenergy markets. Four projects were undertaken: a comparative analysis of bioenergy in Sweden and Austria; a one-day workshop on nontechnical barriers jointly supported by the Production Systems Activity; the development and testing of a framework for analyzing barriers and drivers to bioenergy markets; and surveys of wood pellet users in Sweden, Austria and the US. For the second objective, two projects were undertaken. First, the Activity worked with the Integrated BioEnergy Systems (TBS) Activity of TEA Bioenergy Task XIII to enhance the BioEnergy Assessment Model (BEAM). This model is documented in the final report of the IBS Activity. The Systems Studies Activity contributed to enhancing the feedstock portion of the model by developing a coherent set of willow, poplar, and switchgrass production modules relevant to both the US and the UK. The Activity also developed a pretreatment module for switchgrass. Second, the Activity sponsored a three-day workshop on modeling bioenergy systems with the objectives of providing an overview of the types of models used to evaluate bioenergy and promoting communication among bioenergy modelers. There were nine guest speakers addressing different types of models used to evaluate different aspects of bioenergy, ranging from technoeconomic models based on the ASPEN software to linear programming models to develop feedstock supply curves for the US. The papers from this workshop have been submitted to Biomass and Bioenergy and are under editorial review.

Graham, R.L.

1998-03-17

125

Narcotics and explosives detection by 14N pure nuclear quadrupole resonance  

Microsoft Academic Search

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

Allen N. Garroway; M. L. Buess; J. P. Yesinowski; J. B. Miller

1994-01-01

126

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

127

Detection of RDX and TNT mine like targets by nuclear quadrupole resonance  

Microsoft Academic Search

Nuclear quadrupole resonance (NQR) is being researched in order to confirm the presence of explosives as part of landmine sensor suites for the UK MOD hand held and vehicle mounted detection applied research programs. A low power NQR system has been developed as a non-contacting, but short range, detection method for explosives typically found in landmines. The results of stand-off

Robert M. Deas; Ian A. Burch; Daniel M. Port

2002-01-01

128

RUSSIAN STUDIES Mareike Herrmann (German Studies), Chair  

E-print Network

RUSSIAN STUDIES FACULTY: Mareike Herrmann (German Studies), Chair Beth Ann Muellner (German Studies) Yulia Pogorelova (Language Assistant) Russian Studies is an interdisciplinary area focused on Russia and Eastern Europe in cultural, literary, historical, philosophical, and political contexts. It is one

Wilson, Mark A.

129

Africana Studies 45. . . . . . . . . . . . . . . . . . . American Studies 51. . . . . . . . . . . . . . . . . .  

E-print Network

. . . . . . . . . . . . . . . . . . . . . . German 182. . . . . . . . . . . . . . . . . . . . . . . . . . History 185. . . . . . . . . . . . . . . . . . . . . . . . . . History of Science 207. . . . . . . . . . . . . . . . . Interdisciplinary Studies Program 208. . . . . . . . . . . . . . . . . Legal Studies 225. . . . . . . . . . . . . . . . . . . . . Linguistics 226

Aalberts, Daniel P.

130

RUSSIAN STUDIES Mareike Herrmann (German Studies), Chair  

E-print Network

RUSSIAN STUDIES FACULTY: Mareike Herrmann (German Studies), Chair John Lyles Beth Ann Muellner (German Studies) (on leave 2013-2014) Vitaly Bychkovoy (Language Assistant) Russian Studies is an interdisciplinary area focused on Russia and Eastern Europe in cultural, literary, historical, philosophical

Wilson, Mark A.

131

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...

132

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.

133

Field Studies versus Laboratory Studies, Degradation Rates  

Microsoft Academic Search

The use of laboratory biodegradation half-lives to predict rates of degradation in the field has been studied in several recent publications. In general, laboratory studies are not accurate predictors of field degradation rates. The reasons for this have included: changes to the soil during preparation steps or storage of the soil, the static conditions of the laboratory study versus dynamic

Philip Howard

134

STUDY ABROADFOR INTERNATIONAL RELATIONS & GLOBAL STUDIES MAJORS STUDY ABROAD  

E-print Network

." � Dr. Michael Anderson, Director, International Relations & Global Studies, College of Liberal Arts;QUESTIONS � What classes must I complete on campus for my degree? � How can I ensure a foreign course? � Learn about study abroad and financial aid before you contact Financial Services. Visit: world

John, Lizy Kurian

135

Further studies of study habits and study skills  

Microsoft Academic Search

In previous research, the Estes-Richards Inventory of Study Habits (ERISH) has proven to be a reliable tool, with a stable factor structure when administered to large classes of engineering students. However, in the previous study (FIE 99), there was minimal variability in grades in this Introduction to Engineering class, and thus the ERISH results were not strongly related to performance.

L. G. Richards

2001-01-01

136

Department of Africana Studies  

E-print Network

in the African American Community; AFRS 495 Research Methods in Africana Studies Take one of the following: AFRS to Africana Studies (3) AFRS 495 Research Methods in Africana Studies (3) The Africana Studies major

Sorin, Eric J.

137

Design Case Study: Planning a Study  

NSDL National Science Digital Library

This worksheet, created by Beth Chance and Allan Rossman, provides students with four exercises in designing a case study. Each exercise presents a difference scenario and asks a series of questions about study design. This is a great introduction to applied statistics for any mathematics classroom.

Chance, Beth; Rossman, Allan

2008-12-11

138

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

139

Social Studies, Urban Studies, and Ekistics  

ERIC Educational Resources Information Center

A high school-level course utilizing a model from Constantine A. Doxiadis' study, Ekistics: The Science of Human Settlements, is discussed. The model is interdisciplinary and can be adapted for a wide variety of teaching techniques and social studies curricula. (Author/MB)

Surgal, Joel R.; Yashon, Julius R.

1971-01-01

140

About postgrad study Why do postgraduate study?  

E-print Network

your chosen subject in more depth and enhance your career. This section outlines the factors you need Why you want to take up further study. Before you make a decision about postgraduate study you need you build useful networks? Networking is a crucial element of career development. Make sure you choose

Martin, Ralph R.

141

Ethnographic Study: @ONE Technology Training Project Study.  

ERIC Educational Resources Information Center

This report presents findings from an ethnographic study of technology integration and diffusion in two California community colleges. The study was commissioned to examine whether faculty behavior and student learning outcomes have changed as a result of @ONE instructional technology training and resources. The California Community Colleges…

Obler, Susan; Schiorring, Eva

142

Transformer-coupled NMR probe  

NASA Astrophysics Data System (ADS)

In this study, we propose an NMR probe circuit that uses a transformer with a ferromagnetic core for impedance matching. The ferromagnetic core provides a strong but confined coupling that result in efficient energy transfer between the sample coil and NMR spectrometer, while not disturbing the B1 field generated by the sample coil. We built a transformer-coupled NMR probe and found that it offers comparable performance (loss <1 dB) to a conventional capacitor-coupled circuit. Our probe operates over a wide frequency range (500 kHz-5 MHz in this example) without the need for matching adjustments. Such probes could be useful for low-field mobile NMR applications of multi-frequency operation, such as imaging, relaxation, and diffusion measurements, as well as NQR.

Utsuzawa, Shin; Mandal, Soumyajit; Song, Yi-Qiao

2012-03-01

143

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.

144

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

145

Study tips / Study skills and resources Study skills and resources  

E-print Network

learning! Many of us study passively, underlining some things and copying out chunks of text to use environment distracts you as little as possible, and ensure that you've got all the equipment you need to hand on. 5. Notes and diagrams will help you to retain a sense of structure and progression

Bristol, University of

146

Studying For Exams SEVEN DAY STUDY GUIDE  

E-print Network

your performance. Lack of sleep diminishes one's effectiveness while taking an exam. Study a maximum of yourself physically, especially the week before a test. Eating regularly and getting good sleep will boost

Barrash, Warren

147

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

148

Urban Studies Certificate  

E-print Network

Urban Studies Certificate Urban Studies at UWM Cities can be loud and crowded, but they also such as urban poverty, homelessness, transportation, or troubled schools, urban studies may be for you. The Urban Studies Certificate Program provides the undergraduate student with a coordinated set of courses

Saldin, Dilano

149

WOMEN'S STUDIES CENTER APPLICATION  

E-print Network

WOMEN'S STUDIES CENTER APPLICATION M. A. DEGREE All applicants need to apply to FAU Graduate Studies and to the Women's Studies Center. You may access the FAU general graduate application at http://graduate.fau.edu/GradApp/. Once you have submitted that application, you should complete the Women's Studies application. Thank

Fernandez, Eduardo

150

American Indian Studies.  

ERIC Educational Resources Information Center

A quick look at the literature in American Indian studies reveals that it is divided about equally between historical research and studies of contemporary American Indians, reflecting the strong influence of history and anthropology in the field. American Indian studies overlaps many disciplines. Characterized as an "area study," it is unified by…

Snipp, C. Matthew

151

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

152

Physics studies in Europe; a comparative study  

Microsoft Academic Search

What are the differences and similarities between physics studies at different universities across Europe (here the definition of Europe is broad)? How much does a student have to work to obtain a degree in physics? Questions like those prompted EUPEN (European Physics Education Network) to make a survey. During 1997 and 1998 the working groups of EUPEN sent out a

S Steenstrup; W G Jones; L Tugulea; F J van Steenwijk

2002-01-01

153

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.

154

study abroad STUDY ABROADFOR PSYCHOLOGY MAJORS  

E-print Network

, College of Liberal Arts CAREER Gain a competitive edge that can help you get a job later while building equivalents. #12;QUESTIONS � What classes must I complete on campus for my degree? � What core or major contact Financial Services. Visit: http://world.utexas.edu/abroad/funding � How do loans work for study

John, Lizy Kurian

155

Labour Studies Labour Studies is about revealing  

E-print Network

, racism, child labour, and environmental pollution. Labour Studies courses will explore every aspect. Career Tracks · Labour unions (staff, policy and research positions) · Labour and employment law · Human · Government labour policy · Dispute resolution and mediation · Occupational health and safety · Workers

156

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.

157

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 ... where foods and liquids go when a person swallows. It helps clinicians to identify the reasons for ...

158

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 ...

159

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

160

Children and Clinical Studies  

MedlinePLUS Videos and Cool Tools

... Scientific Reports Technology Transfer What are Clinical Trials? Children & Clinical Studies NHLBI Trials at NIH Clinical Center ... Budget, Planning, & Legislative Advisory Committees Contact Us Home » Children and Clinical Studies Skip Navigation Contact Connect Share ...

161

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.

162

Mechanical Engineering Graduate Studies  

E-print Network

Mechanical Engineering Graduate Studies Carnegie Mellon University College of Engineering #12;Welcome to Mechanical Engineering! Thank you for your interest in graduate study in the Department of Mechanical Engineering at Carnegie Mellon University. We offer students an excellent educational experience

McGaughey, Alan

163

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

164

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

165

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

166

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.

167

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

168

Motivation and study habits  

Microsoft Academic Search

The first part of the article reviews the literature (mainly British) on the relationships between academic performance in higher education and motivation and study habits. The distinction between goal-orientated and intrinsic motivation is used to clarify the meaning of previous studies. Among the investigations of study habits, the dimension of syllabus-boundness\\/syllabus-freedom helps to relate psychiatric work on study difficulties to

N. J. Entwistle; Jennifer Thompson; J. D. Wilson

1974-01-01

169

Spring 2010 Global Studies  

E-print Network

students are in late middle or early high school. Kavita Parikh Junior, Chemistry, and Global Studies minor LeBlanc Junior, Human Development and Sociology, and Spanish and Global Studies minors Study abroad begins teaching a second language to its students in early elementary school and why the US waits until

Suzuki, Masatsugu

170

Migration studies Taught degrees  

E-print Network

Migration studies Essentials Taught degrees MA in Migration Studies MSc in Social Research Methods (for details, refer to page 19) Research degrees MPhil, PhD in Migration Studies Related degree MA taught and research degrees. · Our Masters degrees in the field of migration, globalisation and diversity

Sussex, University of

171

Study Abroad in Architecture  

E-print Network

-solving skills Develop and improve your language skills Study buildings and architectural history of citiesStudy Abroad in Architecture Studying abroad is increasingly important for architecture majors the world and give you the opportunity to gain a new perspective of architecture that will be invaluable

Heller, Barbara

172

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

173

Participate in a Study  

MedlinePLUS

... doctors or find out more facts about the medical condition. A study may connect you with other families going through ... the study? Who will have access to my medical information? Is this study suitable for children? Is there a written guarantee ...

174

Learn about Clinical Studies  

MedlinePLUS

... by a principal investigator, who is often a medical doctor. Clinical studies also have a research team that may include ... Participation Participating in a clinical study contributes to medical knowledge. The results of these studies can make a difference in the care of ...

175

Diversity, & Urban Studies  

E-print Network

Learning, Diversity, & Urban Studies (M.Ed.) Learning, Diversity,& Urban Studies: Understanding" and the Vanderbilt logo are registered trademarks and service marks of Vanderbilt University 2010. "Urban and diverse. These courses include: Learning, Diversity, and Urban Studies Seminars 1 and 2 (6 hours), Learning, Design

Palmeri, Thomas

176

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

177

Studied a Building Lately?  

ERIC Educational Resources Information Center

Presents a report of a community studies program in which high school students prepared an architectural and historical study of interesting and historic community buildings. Presents general information on how and why students should study buildings, including selecting a building, photographing the building and site, interviewing individuals who…

Patton, Thomas W.

1981-01-01

178

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.

179

Developing Environmental Study Areas.  

ERIC Educational Resources Information Center

This publication is designed to help the teacher in developing environmental study areas. Numerous examples of study areas, including airports, lakes, shopping centers, and zoos, are listed. A current definition of environmental study areas is given and guidelines for their development and identification are included. The appendix, which comprises…

Wert, Jonathan M.

180

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

181

Women's Studies (undergraduate)  

E-print Network

of women. Ways in which cultural definitions of "femaleness" affect attitudes toward women348 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

Suzuki, Masatsugu

182

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

183

Women's Studies Scholarships  

E-print Network

Women's Studies Scholarships Complete Scholarship Name Application Deadline Date Contact Name Contact Phone Number Contact E-mail Address Arney Robinson Childs Memorial Award in Women's Studies Women's Studies faculty nominate students with a record of extraordinary achievement and contributions to Women

Almor, Amit

184

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

185

Study Title: Principal Investigator  

E-print Network

in a research study. A research study is how scientists (doctors, nurses and other professionals) try causes disease, how to treat diseases, or what people think and feel about certain things. Before you to understand how things work and gain new knowledge. A research study can be about how the body works, what

Biederman, Irving

186

American Studies Module Information  

E-print Network

BA American Studies Module Information 2014-2015 www.swansea.ac.uk/artsandhumanities Department of Political and Cultural Studies Arts and Humanities College of #12;LEVEL ONE American Studies Modules 2014-2015 (PCS) #12;LEVEL TWO Teching Block 1 AM-245 John F. Kennedy and America AM-200 Crime Story: American

Harman, Neal.A.

187

STUDY PROGRAM Advanced Modules  

E-print Network

Biomacromolecules Biochemistry Microbiology Polymer Engineering and Technology Theory and Simulation Elite Study Program at the University of Bayreuth within the Elite Network of Bavaria The elite study program elite study program to Diplom, Masters and PhD. WHO SHOULD APPLY? Students from national

Ullmann, G. Matthias

188

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...

189

Studies in Iconography.  

ERIC Educational Resources Information Center

Appreciation for the images used in biology can be deepened through iconographical studies (the study of the subject matter and meaning of works of art.) Describes iconographical studies of organisms and ideas beginning with T. H. Clarke's analysis of the iconography used for the rhinoceros. (PR)

Flannery, Maura C.

1993-01-01

190

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.

191

Retention Study Institutional Research  

E-print Network

Retention Study Fall 2012 Institutional Research #12;1 Introduction The Freshman and Transfer Retention Study conducted by Institutional Research (IR) tracks graduation, and persistence rates of new separate studies (New Freshman Retention and Transfer Retention) was in response to campus feedback

192

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

193

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

194

arXiv:1004.4715v1[cond-mat.str-el]27Apr2010 Pis'ma v ZhETF  

E-print Network

proposed 1)e-mail: Irek.Mukhamedshin@ksu.ru recently using NMR/NQR data and confirmed by x-ray Rietveld: the epoxy resin (Stycast 1266) and paraffin, which dis- play distinct advantages and disadvantages. The Sty

Paris-Sud 11, Université de

195

Quadrupole parameters of 11B in crystalline CaO.B2O3.  

PubMed

The quadrupole coupling constant (Qcc) and asymmetry parameter (eta) of 11B in crystalline CaO.B2O3 have been measured employing three different NQR and NMR methods: (1) 11B and 10B NQR; (2) 11B NQR and NMR; and (3) the 11B Zeeman NQR powder pattern. It is found that Qcc = 2594.3 +/- 0.5 kHz and eta = 0.515 +/- 0.001 at 77 K, and Qcc = 2573.5 +/- 0.5 kHz and eta = 0.511 +/- 0.002 at 300 K. These values are in agreement with, but far more accurate than, values obtained from a fourth procedure: measurement of the second-order quadrupolar effects evident in the m = + 1/2<-->m = - 1/2 transition of the 11B NMR spectrum. PMID:1365740

Mao, D; Bray, P J

1992-12-01

196

The two-frequency nuclear quadrupole resonance for explosives detection  

Microsoft Academic Search

The two-frequency nuclear quadrupole resonance (NQR) of14N nuclei is described for purposes of explosives detection. Two applications are known: two-frequency NQR for increasing the\\u000a signal intensity, two-frequency NQR for improved reliability of explosives detection. The two-frequency experiments were carried\\u000a out in hexahydro-1,3,5-trinitro-s-triazine C3H6N6O6 and sodium nitrite NaNO2 as a substitute for octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocycine C4H8N8O8. The two-frequency sequences for NQR are proposed

G. V. Mozjoukhine

2000-01-01

197

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

198

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

199

The case study approach  

PubMed Central

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

2011-01-01

200

Study Abroad INTERNATIONAL PROGRAMS  

E-print Network

, and scholar- ships are available. www.calstate.edu/ip #12;Study Abroad REaL PeoPle, REaL World, REaL educAtion and stand apart from the rest. From all over California, thousands of ReAl people just like you study abroad education and your outlook. Employers want ReAl WoRld experience. study abroad and acquire international

Ravikumar, B.

201

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.

202

HURI SURI: Case Studies  

NSDL National Science Digital Library

The HURI SURI project is developing a regional biotechnology workforce pipeline by expanding and supporting biotechnology research experiences for Jamestown Community College (JCC) undergraduates and disseminating these research experiences and materials to area high school teachers and students. This page includes two case studies, "Mosquito and walbachia" and "Heartworm Experimental Design." Students will examine these case studies and then complete the worksheet for the SCA in class case study

2014-07-15

203

Scripture Study 101  

NSDL National Science Digital Library

In addition to learning HOW to study the sciptures, it\\'s important to understand WHY. OBJECTIVE The student will be able to name at least three reasons why we are to study the scriptures. The student will also be able to name three scripture study ideas. The student will demonstrate his mastery in the following three ways: (a) recording his findings in his class journal; (b) ...

Taylor, Jennie

2006-10-03

204

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.

Webb, Rick

1999-03-01

205

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.

2007-08-20

206

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

207

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.

208

Research Ethics Case Studies  

NSDL National Science Digital Library

This series of case studies, developed to enhance a Trinity College Summer Research Program, raises provocative ethical questions of interest to scientists, teachers and students involved in research.

Alison J. Draper (Trinity College;); Sharon Stickley (St. Joseph College;)

2010-05-28

209

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

210

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

211

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.

212

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

213

African American and African Diaspora Studies African Studies  

E-print Network

Chemistry Chicano-Riqueño Studies Classical Studies Cognitive Science Collins Living Learning Center Mathematics Medieval Studies Institute Microbiology Musical Theatre Mythology Studies Near Eastern Languages

Polly, David

214

World Biofuels Study.  

National Technical Information Service (NTIS)

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 Inde...

T. Alfstad

2008-01-01

215

Comparative Ethnic Studies  

E-print Network

Comparative Ethnic Studies College of Arts and Sciences Degree Options Bachelor of Arts on popular culture, sports, media, and social issues and how they relate to race, class, and gender. � CES: Foundations of Comparative Ethnic Studies CES 209: Hip Hop Around the Globe CES 260: Race and Racism in US

Collins, Gary S.

216

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

217

Study 1: Method Demographics  

E-print Network

Study 1: Method Demographics ·346 men and 299 women · 41.1% Dating, 18.2% Cohabiting, 4.2% Engaged domains, they reported more authenticity doubts and insecurity (Study 1). When they received criticism insecurities perpetuates them. Journal of Personality and Social Psychology, 95, 420-441. Lemay, E. P., Jr

New Hampshire, University of

218

Ontario Health Study (OHS)  

Cancer.gov

Launched in September 2010, the Ontario Health Study (OHS) is a prospective longitudinal cohort study. The OHS is an integrated platform for investigating the complex interplay of environmental, lifestyle and genetic components that increase individual and community risk of common adult diseases.

219

Cuban Studies Newsletter.  

ERIC Educational Resources Information Center

This is the first issue of the Cuban Studies Newsletter, a biannual publication designed to provide comprehensive and timely communication among those interested in Cuban Studies. The purpose of the newsletter stated in a recommendation by the International Conference on Cuban Bibliography and Acquisitions, April, 1970, is to promote the scholarly…

Pittsburgh Univ., PA. University Center for International Studies.

220

Theoretical study on hydrozirconation  

SciTech Connect

Hydrozirconization of acetylene and ethylene was studied for Cp{sub 2}Zr(H)Cl. The study was based on ab initio MO theory calculations. Hydrozirconation by Cl{sub 3}ZrH was presented for comparison with the Cp analog.

Endo, Jun [Institute for Molecular Science, Myodaiji, Okazaki (Japan); Koga, Nobuaki [Nagoya Univ. (Japan); Morokuma, Keiji [Emory Univ., Atlanta, GA (United States)

1993-07-01

221

Qualitative Studies in HRD.  

ERIC Educational Resources Information Center

The first of the four papers in this symposium, "What Is It Like To Be an Independent HRD Consultant?" (Alexander Ardishvili), reports on a phenomenological study that investigated the experience of being an independent HRD (human resource development) consultant through interviews with 10 successful HRD consultants. The study identified eight…

1999

222

Contemporary American Indian Studies  

ERIC Educational Resources Information Center

In his keynote address to the Fifth Annual American Indian Studies Consortium in 2005 David Wilkins began by commenting on earlier attempts to formally organize such a gathering in ways that might help establish and accredit Indian studies programs. He said he had the sense that the thrust of earlier meetings "was really an opportunity for Native…

Larson, Sidner

2009-01-01

223

Biological Studies in Schizophrenia  

Microsoft Academic Search

The question of whether schizophrenia is associated with structural or functional abnormalities of the nervous system, or both, has become the principal focus of biological studies of schizophrenia. Computed tomography studies have revealed ventricular enlargement and cortical atrophy in a subgroup of schizophrenic patients. While present from the early stages of the illness, they appear to be most severe in

Herbert Y. Meltzer

1987-01-01

224

Contemplate Doctoral Study  

ERIC Educational Resources Information Center

It takes an honest look for a technology teacher to determine whether he or she should engage in doctoral study. Doctoral programs have a rather high attrition rate, as high as 40 or 50%, and university resources might be better spent on those who have a greater chance of succeeding. However, for those who take the plunge, doctoral studies can be…

Flowers, Jim; Lazaros, Edward

2009-01-01

225

Advanced planetary studies  

NASA Technical Reports Server (NTRS)

Results of planetary advanced studies and planning support are summarized. The scope of analyses includes cost estimation research, planetary mission performance, penetrator mission concepts for airless planets/satellites, geology orbiter payload adaptability, lunar mission performance, and advanced planning activities. Study reports and related publications are included in a bibliography section.

1976-01-01

226

Colorado Early Childhood Study.  

ERIC Educational Resources Information Center

The Colorado State Board of Education allocated Title IV-V funds in 1975 for a study of the status of early childhood education in Colorado. The purposes of the study were to: (1) gather data relevant to early childhood education on the status of all children from birth through age 5; (2) identify needs of children of this age within the state;…

Colorado State Dept. of Education, Denver. Planning and Evaluation Unit.

227

SETDA Case Studies 2012  

ERIC Educational Resources Information Center

The State Educational Technology Directors Association (SETDA) published a series of case studies from 28 states to showcase examples of how ARRA EETT ("American Recovery and Reinvestment Act of 2009 Enhancing Education Through Technology") grant funds have impacted teaching and learning. SETDA collected data for the case studies through a variety…

State Educational Technology Directors Association, 2012

2012-01-01

228

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

229

Italian Academy Advanced Studies  

E-print Network

site for meetings between distinguished mem- bers of the Italian and American business and politicalThe Italian Academy for Advanced Studies in America at Columbia University Annual Report 2006­2007 The Italian Academy for Advanced Studies in America at Columbia University Annual Report 2006­2007 #12;italian

Qian, Ning

230

Poetry After Cultural Studies  

Microsoft Academic Search

Poetry after Cultural Studies elucidates the potential of poetry scholarship when joined with cultural studies. In eight searching essays covering an astonishing range of poetic practices, geographical regions, and methodological approaches, this volume reflects on what poetry can accomplish in the broadest social and cultural contexts. From Depression-era Iowa to the postcolonial landscape of French-speaking Martinique, whether appearing in newspapers,

Heidi R. Bean; Michael Chasar

2011-01-01

231

Law Studies Curriculum.  

ERIC Educational Resources Information Center

This law studies curriculum guide describes a course designed to provide secondary students with the opportunity to acquire an understanding of the U.S. legal process. The law studies course is intended to develop corresponding concepts and skills in conjunction with the content presented. The content areas of the curriculum include: (1)…

Seminole County Board of Public Instruction, Sanford, FL. Dept. of Curriculum Services.

232

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.

233

Management Development Study.  

ERIC Educational Resources Information Center

This document reports on a management development study within the Department of Transportation (DOT). The aim of the study was to develop a systematic approach to management development for military and civilian personnel. A variety of methods was used to gather data including having DOT staff members gather the information to be passed on to the…

Department of Transportation, Washington, DC.

234

American Indian Studies Certificate  

E-print Network

American Indian Studies Certificate American Indian Studies at UWM The Certificate in American understanding of the Native American tribal nations in North America. All of the United States at one time was American Indian land; however, most of it was transferred gradually to the United States of America

Saldin, Dilano

235

GRADUATE STUDY IN BIOCHEMISTRY  

E-print Network

GRADUATE STUDY IN BIOCHEMISTRY & CELL BIOLOGY Rice University BIOCHEM.RICE.EDU Rice University is a small, elite university that is a member institution of the world's larg- est medical center, the Texas. Every effort is made to facilitate an early entry into thesis research. Each student has GRADUATE STUDY

236

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

237

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

2006-10-30

238

Peace Studies Courses.  

ERIC Educational Resources Information Center

This publication provides a descriptive list of university peace studies programs and organizations that maintain resources in peace education. After a brief introduction in Chapter 1, Chapter 2 describes 34 undergraduate peace studies programs in universities in Canada, Sweden, United Kingdom, and the United States. Chapter 3 describes six…

Demeter, John; Marion, Kevin

1974-01-01

239

Before 1776. Study Guide.  

ERIC Educational Resources Information Center

Designed for use at the elementary level, this study guide accompanies a short history of the life and culture of the Massachusetts Bay Colony prior to the American Revolution (see related document, ED 108 997). The guide provides additional material as well as a series of study questions, suggestions for additional reading, and field trips within…

Gruenbaum, Thelma

240

Home Study Advertising Handbook.  

ERIC Educational Resources Information Center

This handbook contains a collections of nine articles on the subject of direct-response advertising. The handbook gives advice on how to create effective advertisements for home study courses. The nine articles are the following: "Overview of Home Study Advertising in the 1990s" (Michael P. Lambert); "Ad Features that Sell" (Nancie E. Robertson);…

Lambert, Michael P., Ed.; Welch, Sally R., Ed.

241

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...

242

WHY STUDY PORTUGUESE.  

ERIC Educational Resources Information Center

REASONS ARE ADVANCED FOR STUDYING PORTUGUESE, BASED ON THE IMPORTANCE OF THE PORTUGUESE-SPEAKING WORLD, ESPECIALLY BRAZIL, TO THE UNITED STATES. DISTINGUISHED PEOPLE IN GOVERNMENT, BUSINESS, AND EDUCATION NOT ONLY TESTIFY TO THE NEED FOR PEOPLE TO LEARN THE LANGUAGE BUT ALSO NOTE THE ADVANTAGES OF SUCH STUDY. LANGUAGE STUDENTS ARE ADVISED THAT…

ANDREWS, NORWOOD, JR.

243

Linux Specialized Studies Program  

E-print Network

Linux Specialized Studies Program Because of significant cost savings, a growing number of companies are choosing to adopt Linux as an alternative to Microsoft products. The Red Hat Linux Specialized Studies Program will give you the foundation needed to support and use the Linux operating system

Loudon, Catherine

244

Return Address Study Report.  

ERIC Educational Resources Information Center

A study was conducted at Macomb Community College (MCC), in Warren, Michigan, to determine whether respondents to studies would be as likely to include their return addresses on business reply envelopes if there were no lines designating the return address's proper placement. From October 25 through November 18, 1993, 23 mailings were conducted…

Adams, Judith

245

Studies of Unwanted Babies  

ERIC Educational Resources Information Center

Comments on the article by David, Dytrych, and Matejcek (see record 2003-03645-009) which showed the long-term negative psychological effects of unwantedness, up to 35 years after birth. The author states that despite their contention, this is not the only such long-term study. The authors briefly discuss other longitudinal studies of children…

Sigal, John J.

2004-01-01

246

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

247

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, Eliezer; Pedro, Marcelo de Almeida; Sogayar, Ana Cristina Beltrami; Mohovic, Tatiana; Silva, Carla Lika de Oliveira; Janiszewski, Mariano; Cal, Ruy Guilherme Rodrigues; de Sousa, Erica Fernandes; Abe, Thereza Phitoe; de Andrade, Joel; de Matos, Jorge Dias; Rezende, Ederlon; Assuncao, Murillo; Avezum, Alvaro; Rocha, Patricia CS; de Matos, Gustavo Faissol Janot; Bento, Andre Moreira; Correa, Alice Danielli; Vieira, Paulo Cesar Bastos; Knobel, Elias

2004-01-01

248

Considerations of study design.  

PubMed

Research projects attempt to answer specific questions. The particular study design that is selected will depend in large measure on the nature of the question and the time and resources available. There are 5 common categories of clinical questions; they relate to etiology, prognosis, utility of diagnostic tests, efficacy of proposed interventions, and cost of treatment in specific disease states. A number of study designs can be used. Case reports serve to memorialize unusual or novel aspects of diseases. Retrospective case series are useful for defining natural history. Case-control studies are used by epidemiologists to elucidate potential etiologies of diseases. Prospective cohort studies can be used to assess natural history or to assess potential disease etiologies. Controlled trials are designed to assess the efficacy of therapeutic interventions. Studies that define the sensitivity and specificity of diagnostic tests can be used to assess the utility of those tests. Economic analyses estimate the costs that particular diseases or therapies will require. Each of these study designs has limitations; with the exception of high-quality randomized trials, none of these study designs can establish a causative relationship between putative etiologic (or therapeutic) factors and disease (outcomes). PMID:18042945

Koretz, Ronald L

2007-12-01

249

National Election Studies  

NSDL National Science Digital Library

In this season of electoral uncertainty, both researchers and concerned citizens can find the extensive data available at the National Election Studies Website quite useful. "NES conducts national surveys of the American electorate in presidential and midterm election years and carries out research and development work through pilot studies in odd-numbered years. The NES time-series now encompasses 23 biennial election studies spanning five decades." The data from these studies, along with codebooks, cover public opinion and political participation themes such as "expectations about the election outcome; perceptions and evaluations of the major parties and their candidates; interest in the campaign; information about politics; partisanship; assessments of the relative importance of major problems facing the country; attention to campaign coverage in the mass media; feelings of political efficacy; political values; conservatism vs. liberalism; trust in government; political participation; vote choice; economic well-being; positions on social welfare, economic, social, and civil rights issues" and more. Pilot studies, whose data is also available on-site, are conducted in off-election years in order "to test new, or refine existing, instrumentation and study designs." A major feature of the site, useful to not only researchers but journalists and the general public, is The NES Guide to Public Opinion and Electoral Behavior, which offers easily digestible data on a whole range of issues drawn from the time-series studies.

250

Decontamination solution development studies  

SciTech Connect

This study was conducted for the Westinghouse Hanford Company (WHC) by Pacific Northwest Laboratory (PNL) as part of the Hanford Grout Technology Program (HGTP). The objective of this study was to identify decontamination solutions capable of removing radioactive contaminants and grout from the Grout Treatment Facility (GTF) process equipment and to determine the impact of these solutions on equipment components and disposal options. The reference grout used in this study was prepared with simulated double-shell slurry feed (DSSF) and a dry blend consisting of 40 wt % limestone flour, 28 wt % blast furnace slag, 28 wt % fly ash, and 4 wt % type I/II Portland cement.

Allen, R.P.; Fetrow, L.K.; Kjarmo, H.E.; Pool, K.H.

1993-09-01

251

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

252

Videofluoroscopic Swallowing Study (VFSS)  

MedlinePLUS

... SLP needs even more information about how you swallow. You may need another swallowing test - this time ... are: videofluoroscopic swallowing study, or videofluoroscopy modified barium swallow, or MBS esophagram cookie swallow The American Speech- ...

253

Coso Geothermal Corrosion Studies.  

National Technical Information Service (NTIS)

This report documents the results of geothermal corrosion studies conducted at the Coso Thermal Area, Naval Weapons Center, China Lake, California. Nine different common construction-grade piping materials were tested for periods up to about one year in t...

S. A. Finnegan

1977-01-01

254

Environmental Engineering GRADUATE STUDIES  

E-print Network

reclamation and reuse; hazard- ous and solid waste engineering; ground water modeling and treatment; airEnvironmental Engineering GRADUATE STUDIES ENVIRONMENTAL ENGINEERING (EnvE) at Georgia Tech provides comprehensive educational andresearch opportunities in air, land and water science & engineering

Wang, Yuhang

255

NYU Child Study Center  

MedlinePLUS

... the latest issues in child and adolescent mental health. We invite you to Grand Rounds, a forum for the presentation of advances in child & adolescent psychiatry and psychology. © NYU Child Study Center, One Park Avenue, 7th ...

256

Gender Studies & Feminist Research  

E-print Network

Gender Studies & Feminist Research The Graduate Program in Research Symposium | Winter 2012 MISS, and the Women's Centre of Hamilton SPACES BETWEEN US: GENDER, SEXUALITY, INDIGENEITY RESEARCH PANEL January 19

Thompson, Michael

257

Degree Requirements Liberal Studies  

E-print Network

Fiction (also SCI 355U) SP 415U WIC: Problems Intercultural Communication ENG 384 WIC: Contemporary BST 221, 351-353, 421, 424-427), Communication Studies, Conflict Resolution, English/Writing, Foreign

258

LAKE NUTRIENT MODELING STUDY  

EPA Science Inventory

Determining the effects of morphological conditions, turbidity and watershed land use / land cover patterns on nutrient levels in Central Plains lakes and reservoirs. The study involves intensive field monitoring for the calibration and verification of basin and watershed models...

259

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

260

Electrophysiology Studies (EPS)  

MedlinePLUS

... catheterization (cath) lab while you are mildly sedated. Why do people have electrophysiology studies? When someone’s heart doesn’t beat normally, doctors use EPS to find out why. Electrical signals usually travel through the heart in ...

261

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)...

262

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.

263

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

264

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; Smith, Martin

2006-11-11

265

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

266

Nature Study Tips. Spiders.  

ERIC Educational Resources Information Center

Different types of spiders, their ranges and habits are discussed. Activities associated with the study of spiders are suggested. Four references are listed which may be of interest to beginners. (CW)

Mulaik, Stanley B.

1990-01-01

267

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.

268

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

269

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

270

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...

271

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

272

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, ...

273

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

274

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.

275

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

276

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

277

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

278

Concrete containment aging study  

SciTech Connect

In 1989, IAEA initiated a pilot study on the management of aging of nuclear power plant components. The Phase I and II studies of concrete containment are discussed. With the data base, plant owners will be able to review and enhance their existing programs. IAEA will analyze data provided by participating plants and the report is scheduled to be released by late 1994 (final report release mid-1995).

Pachner, J. [International Atomic Energy Agency, Vienna (Austria); Tai, T.M. [Bechtel National, Inc., Oak Ridge, TN (United States); Naus, D. [Oak Ridge National Lab., TN (United States)

1994-04-01

279

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.; Minor, Anastasia.; Weyrich, Carolyn.

1997-01-01

280

Twin Studies of Behavior  

Microsoft Academic Search

In the age of molecular genetics some commentators have questioned whether twin studies will continue to be a useful tool\\u000a for studying genetic influences on behavior. Many of us think the answer is yes (Bouchard & Propping, 1993). Work with monozygotic\\u000a twins reared apart provides an imperfect, but nevertheless powerful window on the direct influence of genes on whole organisms.

Thomas J. Bouchard

281

Longitudinal-Experimental Studies  

Microsoft Academic Search

\\u000a Longitudinal-experimental studies are follow-up surveys that include an experimental intervention. The main advantage of these\\u000a surveys is that it is possible to study both the natural history of development and the impact of interventions in one research\\u000a project. This chapter focusses on large-scale community surveys with repeated personal interviews with participants spanning\\u000a at least 5 years. It reviews the advantages

David P. Farrington; Rolf Loeber; Brandon C. Welsh

282

Background Studies for EXIST  

NASA Technical Reports Server (NTRS)

We present results from a study of the trapped proton and electron background for several orbital inclinations and altitudes. This study includes time dependent effects. In addition we describe a 3 component cosmic background model developed at the University of Southampton, UK. The three components are cosmic diffuse gamma rays, atmospheric albedo gamma rays, and cosmic ray protons. We present examples of how this model was applied to BATSE and discuss its application to EXIST.

Wilson, Colleen A.; Pendleton, G. N.; Fishman, G. J.

2004-01-01

283

Tethered subsatellite study  

NASA Technical Reports Server (NTRS)

The results are presented of studies performed relating to the feasibility of deploying a subsatellite from the shuttle by means of a tether. The dynamics, the control laws, the aerodynamics, the heating, and some communication considerations of the tethered subsatellite system are considered. Nothing was found that prohibits the use of a subsatellite joined to the shuttle by a long (100 km) tether. More detailed studies directed at specific applications are recommended.

Baker, W. P.; Dunkin, J. A.; Galaboff, Z. J.; Johnston, K. D.; Kissel, R. R.; Rheinfurth, M. H.; Siebel, M. P. L.

1976-01-01

284

Fossil crinoid studies  

E-print Network

THE UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS November 15, 1974 Paper 73 FOSSIL CRINOID STUDIES' ROGER K. PABIAN and HARRELL L. STRIMPLE University of Nebraska, Lincoln; University of Iowa, Iowa City CONTENTS PAGE PART I. MISCELLANEOUS..., NEBRASKA 31 PART 4. BIOMETRICAL STUDY OF THE MORPHOLOGY AND DEVELOPMENT OF A NLW SPECIES OF TERPNOCRINUS STRIMPLE AND MOORE, PENNSYLVANIAN, NEBRASKA 38 REFERENCES (Pans 1-4) 52 ADDENDUM 53 ' Manuscript received February 21, 1974. 2 The University...

Pabian, R. K.; Strimple, H. L.

1974-11-15

285

Vitrification melter study  

SciTech Connect

This report presents the results of a study performed to identify the most promising vitrification melter technologies that the Department of Energy (EM-50) might pursue with available funding. The primary focus was on plasma arc systems and graphite arc melters. The study was also intended to assist EM-50 in evaluating competing technologies, formulating effective technology strategy, developing focused technology development projects, and directing the work of contractors involved in vitrification melter development.

Jones, J.A.

1995-04-01

286

Genome Wide Association Studies  

NASA Astrophysics Data System (ADS)

The availability of high throughput technology for parallel genotyping has opened the field of genetics to genome-wide association studies (GWAS). These studies generate massive amount of genetic data that challenge investigators with issues related to data management, statistical analysis of large data sets, visualization, and annotation of results. We will review the common approach to analysis of GWAS data and then discuss options to learn more from these data.

Sebastiani, Paola; Solovieff, Nadia

287

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

288

Photovoltaics information user study  

SciTech Connect

The results of a series of telephone interviews with groups of users of information on photovoltaics (PV) are described. These results, part of a larger study on many different solar technologies, identify types of information each group needed and the best ways to get information to each group. The report is 1 of 10 discussing study results. The overall study provides baseline data about information needs in the solar community. It covers these technological areas: photovoltaics, passive solar heating and cooling, active solar heating and cooling, biomass energy, solar thermal electric power, solar industrial and agricultural process heat, wind energy, ocean energy, and advanced energy storage. An earlier study identified the information user groups in the solar community and the priority (to accelerate solar energy commercialization) of getting information to each group. In the current study only high-priority groups were examined. Results from seven PV groups respondents are analyzed in this report: DOE-Funded Researchers, Non-DOE-Funded Researchers, Researchers Working for Manufacturers, Representatives of Other Manufacturers, Representatives of Utilities, Electric Power Engineers, and Educators.

Belew, W.W.; Wood, B.L.; Marie, T.L.; Reinhardt, C.L.

1980-10-01

289

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

290

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

291

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.

2009-10-08

292

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

293

Optimal symmetric flight studies  

NASA Technical Reports Server (NTRS)

Several topics in optimal symmetric flight of airbreathing vehicles are examined. In one study, an approximation scheme designed for onboard real-time energy management of climb-dash is developed and calculations for a high-performance aircraft presented. In another, a vehicle model intermediate in complexity between energy and point-mass models is explored and some quirks in optimal flight characteristics peculiar to the model uncovered. In yet another study, energy-modelling procedures are re-examined with a view to stretching the range of validity of zeroth-order approximation by special choice of state variables. In a final study, time-fuel tradeoffs in cruise-dash are examined for the consequences of nonconvexities appearing in the classical steady cruise-dash model. Two appendices provide retrospective looks at two early publications on energy modelling and related optimal control theory.

Weston, A. R.; Menon, P. K. A.; Bilimoria, K. D.; Cliff, E. M.; Kelley, H. J.

1985-01-01

294

REP Concept Feasibility Study  

NASA Technical Reports Server (NTRS)

Radioisotope Electric Propulsion (REP) may have the potential to provide certain advantages, over conventional chemical propulsion, for outer planetary exploration involving small bodies and long term investigations for medium class missions requiring power comparable to past outer planetary exploration missions. This paper describes a study that investigates the concept s feasibility by performing a preliminary conceptual design of an REP-based spacecraft for a design reference mission. The mission utilizes a spacecraft with a radioisotope power supply less than one kilowatt while operating for a minimum of 10-years. A key element of the REP spacecraft is to ensure sustained science return by orbiting or flying in formation with selected targets. Utilizing current and impending technological advances, this study finds that at a conceptual design level a small body REP orbiter/explorer appears to be feasible for the design reference mission selected for this study.

Edwards, Daryl A.; Ensworth, Clinton B. F.; Goodnight, Thomas W.; Sheehe, Charles J.; Wiersma, Stephen C.; Adamsen, Paul B., II; Frank, Larry

2004-01-01

295

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

296

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

297

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

298

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).

2005-10-31

299

Advanced engine study program  

NASA Technical Reports Server (NTRS)

A design and analysis study was conducted to provide advanced engine descriptions and parametric data for space transfer vehicles. The study was based on an advanced oxygen/hydrogen engine in the 7,500 to 50,000 lbf thrust range. Emphasis was placed on defining requirements for high-performance engines capable of achieving reliable and versatile operation in a space environment. Four variations on the expander cycle were compared, and the advantages and disadvantages of each were assessed. Parametric weight, envelope, and performance data were generated over a range of 7,500 to 50,000 lb thrust and a wide range of chamber pressure and nozzle expansion ratio.

Masters, A. I.; Galler, D. E.; Denman, T. F.; Shied, R. A.; Black, J. R.; Fierstein, A. R.; Clark, G. L.; Branstrom, B. R.

1993-01-01

300

Social Studies School Service  

NSDL National Science Digital Library

Beginning this month, socialstudies.com offers an Online Course for New History/ Social Studies Teachers designed to provide new teachers with icebreakers, lesson plans, background pedagogy, and activities for the classroom. Currently, IceBreakers, Introduction to Social Studies, and Lesson Planning (including over a dozen sample lessons) are online with Creative Lessons, Idea Books and Activities, and Assessment to follow. Lesson Planning also gives lists of supplementary print resources from socialstudies.com, which may be purchased online, and links to useful educational Websites.

301

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

302

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

303

National Facilities study  

NASA Technical Reports Server (NTRS)

This study provides a set of recommendations for improving the effectiveness of our nation's aeronautics and space facilities. The study plan considers current and future government and commercial needs as well as DOD and NASA mission requirements through the year 2023. It addresses shortfalls in existing capabilities, new facility requirements, upgrades, consolidations, and phase-out of existing facilities. If the recommendations are implemented, they will provide world-class capability where it is vital to our country's needs and make us more efficient in meeting future needs.

1994-01-01

304

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

305

Comments on acute studies.  

PubMed

Sixteen papers which have examined the effects of Duovent (a combination of fenoterol 200 micrograms and ipratropium bromide 80 micrograms) in the treatment and prevention of bronchospasm by acute studies are reviewed. The studies suggest that the use of a combination of anticholinergic and beta 2-adrenergic drugs is justified, because the dominant mechanism in bronchospasm is the effect of acetylcholine on muscarinic receptors and because ipratropium bromide increases the action of fenoterol, so as to obtain prolonged bronchospasmolytic and antibronchoconstrictive effects with halved doses of beta 2-agonist. PMID:2882568

Del Bono, N

1986-01-01

306

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 ...

Kalvaitis, Darius

2006-02-17

307

Correlative Studies with RBSP  

NASA Technical Reports Server (NTRS)

The objectives of NASA's Living With a Star (LWS) Radiation Belt Storm Probe (RBSP) mission are: (1) Which physical processes produce radiation belt enhancement events? (2) What are the dominant mechanisms for relativistic electron loss? (3) How do ring current and other geomagnetic processes affect radiation belt behavior? Although a stand-alone mission, RBSP will benefit from correlative studies with observations made by other spacecraft and ground-based observatories. In this presentation, we describe the broad range of such studies as a function of RBSP mission phase, pointing to the unique contributions of both the RBSP mission and the other observatories.

Sibeck, D. G.

2012-01-01

308

Plants Study Guide.  

ERIC Educational Resources Information Center

This study quide is intended to provide students with information about the types and functions of plants, along with some individual learning activities. The guide contains sections about: (1) the contributions of plants to life on earth and the benefits they afford to humanity; (2) the processes of photosynthesis and respiration; (3) the flow of…

Brynildson, Inga

309

Studying Citizenship Constellations  

Microsoft Academic Search

The papers in this special issue of JEMS illustrate how the field of citizenship studies is moving towards a much more systematic comparative approach. They also indicate that the gap between political and legal branches might be narrowing. This brief concluding contribution reflects on a perspective that goes beyond the currently dominant framework, without replacing it. For both comparative and

Rainer Bauböck

2010-01-01

310

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.

311

Women's Studies Intellectually stimulating,  

E-print Network

to entrance awards, the Outstanding Scholars Program attracts top high school students entering any first degree. Joint degrees with Psychology, English, History, Sociology, and Criminology are popular's Studies, Psychology and Sociology · Correctional services · Women's shelters and crisis centres Admission

312

Women's Studies Intellectually stimulating,  

E-print Network

in the sidebar. In addition to entrance awards, the Outstanding Scholars Program attracts top high school degree. Joint degrees with Psychology, English, History, Sociology, and Criminology are popular of disciplines such as Women's Studies, Psychology and Sociology � Correctional services � Women's shelters

313

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

314

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

315

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

316

HF Antenna Optimization Study.  

National Technical Information Service (NTIS)

The report presents a summation of a study to determine the optimum log periodic dipole array design for a high gain, low coverage HF antenna over real and/or ground screen covered earth. The major problem encountered is one of determining antenna electri...

C. T. Elfving, D. L. Johnstone, U. R. Embry, V. R. Arens

1969-01-01

317

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

318

Alternative School Administration Study  

ERIC Educational Resources Information Center

The purpose of this study was to determine how principals spend their time and to test a new structure using business management trained staff to increase principal time spent on academic achievement and gap closure. Twenty-one elementary school principals were randomly selected for a week-long time-task analysis. Data collectors shadowed the…

Shellinger, Mark

2005-01-01

319

Vocational Teacher Education Study.  

ERIC Educational Resources Information Center

A study was conducted to determine the present state of vocational education in Kentucky and the supply of and demand for vocational teachers. Results are summarized for vocational teacher education in general and for teachers in the areas of agricultural education, business and office education, marketing and distributive education, health and…

Tulloch, Charlotte

320

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

321

Case Studies Behavior Modification.  

ERIC Educational Resources Information Center

The case histories of five students enrolled in a university course in how to study are reported. The students ranged in age from 18 to 35, included two males and three females, and varied in school experience from no college in one case and some college in two cases to college degrees in two cases. Students were initially taught to chart their…

Wark, David M.

322

Morrie: A Case Study.  

ERIC Educational Resources Information Center

Presents a case study demonstrating successful behavioral treatment of a depressed older man using group and conjoint therapy. Two major issues in dealing with the aged are addressed: dealing with resistance to therapy, and distinguishing between disability due to organic brain syndrome and that due to depression. (Author/RC)

Wheeler, Eugenie G.; Knight, Bob

1981-01-01

323

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 ...

324

Bellwether Social Studies Programs.  

ERIC Educational Resources Information Center

Describes and reviews commercially-available computer software for social studies (SS). They are: "Jury Trial II" (utilizes artificial intelligence); "Africa" (utilizes creative graphics to teaching SS facts; "Revolutions: Past, Present and Future"; "The Other Side" (examines world peace using values clarification); and "SIMPOLICON: A Simulation…

Daetz, Denney

1985-01-01

325

Studies That Observe Humans  

MedlinePLUS

... trying to guess at the cause and even writing about it as if the guess were fact. For instance, there were studies some years ago that linked gum disease with heart attacks. News reports talked about this link, with many theories about ...

326

Division of Continuing Studies  

E-print Network

in 2011 389 online writing students... ...participated in Continuing Studies online writing classes this year; 137 writers took advantage of our online critique services uditors campus careercatalog change--benefit students who return to school while juggling families and jobs. We provide advising and counseling

Sheridan, Jennifer

327

Polymer infiltration studies  

NASA Technical Reports Server (NTRS)

The preparation is reported of carbon fiber composites using advanced polymer resins. Current and ongoing research activities include: powder towpreg process; weaving, braiding and stitching dry powder prepreg; advanced tow placement; and customized ATP towpreg. The goal of these studies is to produce advanced composite materials for automated part fabrication using textile and robotics technology in the manufacture of subsonic and supersonic aircraft.

Marchello, Joseph M.

1992-01-01

328

Graduate Studies Environmental Engineering  

E-print Network

reclamation and reuse; hazardous and solid waste engineering; ground water modeling and treatment; air qualityGraduate Studies Environmental Engineering ENVIRONMENTAL ENGINEERING (EnvE) at Georgia Tech provides comprehensive educational and research opportunities in air, land and water science & engineering

Storici, Francesca

329

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

330

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...

331

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.

College, The E.; College, Northwest I.; College, Salish K.; College, Grays H.

332

Reinventing Social Studies  

ERIC Educational Resources Information Center

There is so much more to preparing a citizen than merely running students like lemmings through a three-year succession of history survey courses. Everyone is neglecting most of the social sciences in American high schools today, favoring the sequential and systematic delivery of history. What should be primary in the teaching of social studies,…

St. Jarre, Kevin

2008-01-01

333

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.

334

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

335

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.

336

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

337

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

338

Global Vision Study Abroad  

E-print Network

Finding a Global Vision Study Abroad Students Visit South Africa Philosophy in the Community arts sculpture of South Africa's late pop diva Brenda Fassie. More on Page 4 #12;At every post of issues. Dirk has now returned to his previous position as Head of the Department of Geography

Saskatchewan, University of

339

Resources for Women's Studies.  

ERIC Educational Resources Information Center

Over 120 bibliographies and other reference sources relevant to women's studies are identified in this annotated listing. Subjects include feminist scholarship, women in management, popular culture, autobiographies, other cultures and countries, history, lesbian women, women's education, the arts, politics, and rape. In addition to author, title,…

Ridinger, Robert B.

340

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

341

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.

342

Study Mode Negotiation.  

ERIC Educational Resources Information Center

This paper outlines a model of study mode negotiation between clients and English Language Training providers that has been developed at the University of Malaya, specifically related to English language writing skills as taught to corporate clients. Negotiation is used to reach decisions concerning the goals and methodology of learning to ensure…

Vasan, Mani Le; Sargunan, Rajeswary

343

Skin Cancer Prevention Study  

Cancer.gov

Actinic keratoses (AKs) are precancerous skin growths that are usually caused by sun exposure. This study seeks to determine if the drug celecoxib prevents new AKs from developing, causes existing AKs to go away, and prevents AKs from progressing to squamous cell cancer.

344

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...

345

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

346

Epidemiological Study of Childhood  

E-print Network

asthma is essential if the long-term benefits of therapy are be properly evaluated and patients properly counselled. A number of studies have followed children with asthma through The childhood Medical Journal and adolescence of Australia into ISSN: adult 0025-729X life, but 16few

Colin F Robertson

347

EMPIRICAL STUDIES RECHERCHES EMPIRIQUES  

E-print Network

EMPIRICAL STUDIES RECHERCHES EMPIRIQUES EFFECTS OF DRIVING EXPERIENCE AND AGE ON THE DETECTION) and elderly (i.e., over 68 years old) drivers (Cerrelli, 1992; Engströme, Petter Greger- sen, Hernetkoski collision. Most research on perceptual factors in driving has focused

Jirsa, Viktor

348

Degree Requirements Liberal Studies  

E-print Network

(also SCI 355U) SP 415U WIC: Problems Intercultural Communication ENG 384 WIC: Contemporary Literature BST 221, 351-353, 421, 424-427), Communication, Conflict Resolution, English/Writing, Humanities, Music*, Philosophy, Communication Studies, Speech and Hearing Sciences, Theater Arts*, World Languages

349

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...

350

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

351

The Beijing Audience Study.  

ERIC Educational Resources Information Center

Although communication research in China is in an early stage of development, an increasing number of training/research activities exist in universities and institutes. The 1982 Beijing Audience Survey, the first large-scale communication field study in China, reports how mass media audiences (newspaper, radio, and television) are rapidly…

Rogers, Everett M.; And Others

1985-01-01

352

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 ...

353

MONTEFIORE - ASTHMA INTERVENTION STUDY  

EPA Science Inventory

Montefiore Medical Center is conducting an asthma intervention study using, in part, their Lead Safe House on the Montefiore campus, a low-allergen controlled setting. There are three groups of participants, all severe asthmatics. The first group is being moved temporarily into...

354

Hypothetical Reactor Accident Study  

E-print Network

in the 1979 census and on 20 years of data from the meteorological station at Rosslare Harbour, 8.5 km north 31 3.3. MeteorologicaL statistics 32 3.3.1. Rosslare meteorological data 32 3.3.2. Weather categories in a meteorological parametric study. Likewise the consequences of the worst conceivable combination of situations

355

Midwestern rain enhancement study  

Microsoft Academic Search

The farmer's dream of calling down rain just when and where his crops need it may be taken a step closer to reality. A multiphase study, called Pace (Precipitation Augmentation for Crops Experiment), examines the possibility of applying the most advanced weather modification techniques. This summer in Illinois, the Water Survey Division of the Illinois Institute of Natural Resources has

Peter M. Bell

1980-01-01

356

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

357

Science Curriculum Topic Study  

NSDL National Science Digital Library

Need help making the connection between science standards, teacher practice, and improved student achievement? Science Curriculum Topic Study is your missing link. The book offers a systematic professional development strategy that brings together science standards and research with curriculum, instruction, and assessment. Writing in the book's foreword, Harold Pratt, former NSTA President, calls Science Curriculum Topic Study "by far the best thing I have seen on how to effectively use the standards." The CTS process will help you: � Improve your understanding of science content � Clarify a hierarchy of content and skills in a learning goal from state or local standards � Define formative and summative assessment goals and strategies � Learn to recognize and address learning difficulties � Design or use instructional materials effectively � Increase opportunities for students of all backgrounds to achieve science literacy Science Curriculum Topic Study is rich with features that make it both easy to use and illuminating. It contains 147 separate curriculum topic study guides arranged in 11 categories representing the major domains of science. You get worksheets to help you apply the CTS process to curriculum, instruction, and assessment, plus a quick-reference guide to the major standards and research documents. In addition, teacher vignettes show how to use the CTS process to enrich your own teaching immediately.

Keeley, Page

2005-01-01

358

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

359

Control rod studies  

Microsoft Academic Search

This study was undertaken to answer questions asked regarding the required rod stroke for control of modified Tory II-C reactors. All problems described were solved with the Angie code and based on Tory-II-C design problems, RZ 501 and RZ 502, representing hot and cold reactors respectively.

1963-01-01

360

Childhood and Adolescence Studies  

E-print Network

understand children and adolescents and the world around them. They are able to make more informed decisionsChildhood and Adolescence Studies Certificate About Us This certificate program helps students understand the lives and unique perspectives of children and adolescents. Students learn about social

Saldin, Dilano

361

STUDY ABROAD @ ULM UNIVERSITY  

E-print Network

-auslandsstudienberatung@uni-ulm.de Websites: Ulm University: http://www.uni-ulm.de Institute of Mathematics and Economics: http (2003) attracts students from around the world. Further- more, the faculty offers supplementarySTUDY ABROAD @ ULM UNIVERSITY Economics and Business Administration Ulm University

Pfeifer, Holger

362

Introduction: Rural Cultural Studies  

Microsoft Academic Search

This themed section of Australian Humanities Review seeks to establish the emerging field of 'rural cultural studies' firmly on the agenda of the contemporary humanities and social sciences. This is a timely intervention as rural Australia has featured increasingly over the last decade and especially over the last few years as a topic of national policy attention, public commentary and

David Carter; Kate Darian-Smith; Andrew Gorman-Murray

363

Global Studies Bibliography.  

ERIC Educational Resources Information Center

Over 80 publications, most of which were published between 1975 and 1983, are listed in this annotated bibliography of books, articles, bulletins, and sources of instructional materials. Most of the items listed in this bibliography are intended to give the reader a general overview of global studies or to provide examples of the variety of…

Becker, James

364

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

365

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

366

Outdoor Unified Studies.  

ERIC Educational Resources Information Center

Escalante (Utah) High School's outdoor unified studies field trip is a learning experience to be remembered. The four-day camping experience begins with pre-trip plans, pretests, and lecture/introductions to the Anasazi culture and to geologic formations to be visited. Horses (and equipment-carrying trucks) take the students into the desert to set…

Liston, Louise

367

Biosynthetic studies on taxol  

Microsoft Academic Search

The biosynthesis of the plant antitumor agent, taxol, was studied by feeding radioactive or stable isotope-labeled precursors to cut stems or to inner bark tissue of Taxus brevifolia. The labeled taxol was purified to radiochemical purity and subjected to chemical degradation or was analyzed by electrospray tandem mass spectrometry. It was demonstrated that in the plant taxol is synthesized from

P. E. Fleming; G. Floss; M. Haertel; A. R. Knaggs; A. Lansing; U. Mocek; K. D. Walker

1994-01-01

368

ATTRITION RATE STUDY.  

ERIC Educational Resources Information Center

INSTEAD OF FOCUSING ON STUDENT CHARACTERISTICS, AS DO MOST DROPOUT STUDIES, THIS ONE (1) CONSIDERS SPECIFIC INSTITUTIONAL CHARACTERISTICS OF GRADING PRACTICES, (2) ANALYZES THESE PRACTICES WITHIN A GIVEN TERM INSTEAD OF OVER SEVERAL YEARS, AND (3) BROADENS THE DEFINITION OF ATTRITION TO INCLUDE BOTH FAILURE AND WITHDRAWAL. IT ATTEMPTS TO IDENTIFY…

HANSEN, M. DUANE; WENZEL, GUSTAVE G.

369

Social Studies: Grade 8.  

ERIC Educational Resources Information Center

This Manitoba (Canada) curriculum guide for eighth grade social studies students contains suggested teaching strategies and learning activities in four units covering: (1) life during prehistoric and early historic times; (2) ancient civilizations; (3) life in early modern Europe; and (4) life in the modern world. Each unit includes an overview,…

Manitoba Dept. of Education, Winnipeg.

370

Studying Ancient History.  

ERIC Educational Resources Information Center

Defends the value and relevance of the study of ancient history and classics in history curricula. The unique homogeneity of the classical period contributes to its instructional manageability. A year-long, secondary-level course on fifth-century Greece and Rome is described to illustrate effective approaches to teaching ancient history. (AM)

Barrow, Robin

1982-01-01

371

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. The thesisbased Master of Science and Ph.D. degrees are designed for research or academic careers

372

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.; Krishnan, Shekhar.; Schwarz, Henry.

1996-01-01

373

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.

Katherine Young

374

Social Studies Curriculum Guide.  

ERIC Educational Resources Information Center

A general framework is presented for the Sheridan School District K-12 social studies curriculum. The guide is arranged into three sections: rationale, goals and objectives, and scope and sequence. The rationale section emphasizes that students should develop awareness of individual rights and responsibilities, cope with the problems of our…

Sheridan School District 2, Englewood, CO.

375

Residential Studies Course Outline  

NSDL National Science Digital Library

This document from Betty Ravnik of Alexandria Technical College provides an outline for a residential studies course. The main goal of the course was for students to develop their skills in residential design while learning sustainable design concepts. The outline includes an extensive list of objectives for the course. This document may be downloaded in PDF file format.

Ravnik, Betty

2011-11-23

376

Eye tissues study  

NASA Astrophysics Data System (ADS)

Theoretical and in vitro and in vivo experimental study of spectral and polarization characteristics of the human and rabbit eye tissues are presented. The possibility of control of optical properties of eye cornea, lens and sclera is discussed and realized experimentally for glucose solution as the refractive index matching factor.

Tuchin, Valery V.; Bashkatov, Alexey N.; Maksimova, Irina L.; Sinichkin, Yurii P.; Simonenko, Georgy V.; Genina, Elina A.; Lakodina, Nina A.

2001-08-01

377

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. 

378

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...

379

Contemporary China Studies  

E-print Network

· Risk issues in doing business with China Marketing for the Chinese market 3 1 · Consumer behaviour · Advertising and promotion · Brand building · Public relations · Business opportunities & making market studies of consumer markets · The role of government in the economy · Structure of financial system · Growth of China

Einmahl, Uwe

380

Central & east european studies  

E-print Network

,cricketoval,6grassand2syntheticpitches,squashandtenniscourts, fitness suite, exercise studio � we take sport seriously �Ourlibraryisopen361 days of the year from 7.15am�2am and has 2.5 million print books and journals@glasgow.ac.uk www.glasgow.ac.uk/ug/cees you will study the history, economics, politics and sociology

Guo, Zaoyang

381

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...

382

Introduction Intercultural Studies  

E-print Network

that each of us faces today in the global society, also from the perspective of "culture". The new, and interchange. 3. Multifaceted studies of cultural metamorphosis amid the globalization of contemporary life. 4 Intercultural Communication Culture and Globalization Contemporary Culture and Society Human Communication

Banbara, Mutsunori

383

Introduction Intercultural Studies  

E-print Network

that each of us faces today in the global society, also from the perspective of "culture". The new, and interchange. 3. Multifaceted studies of cultural metamorphosis amid the globalization of contemporary life. 4 Communication Culture and Globalization Contemporary Culture and Society Human Communication and Information

Banbara, Mutsunori

384

Social Studies Journal, 2003.  

ERIC Educational Resources Information Center

This theme issue of the "Social Studies Journal" focuses on the worldwide conflict known in the United States as the French and Indian War (1754-1763). The volume is dedicated to examining the conflict in Pennsylvania. Western Pennsylvania became a battle-scarred landscape as the British and French, with their Native American allies, struggled for…

West, Leo R., Ed.

2003-01-01

385

Social Studies; Colonial America.  

ERIC Educational Resources Information Center

Students in grades seven through nine will examine and analyze the political organization, social structure, economic life, and values of the American Colonial period in this quinmester arranged American Studies course. Since the thirteen English Colonies effected the United States development, many of our nations foundations in government,…

Hanson, Paul S.

386

Resources for Interdisciplinary Studies  

ERIC Educational Resources Information Center

Resources for interdisciplinary studies (IDS) appear in a multitude of print publications, online forums, and the "fugitive" or "gray" literature of conference papers, reports, and curriculum materials. The quantity is not surprising, since interdisciplinary discussions have expanded as new fields and approaches emerged across all domains of…

Klein, Julie Thompson

2006-01-01

387

Urban Expansion Study  

NASA Technical Reports Server (NTRS)

Under an Egyptian government contract, PADCO studies urban growth in the Nile Area. They were assisted by LANDSAT survey maps and measurements provided by TAC. TAC had classified the raw LANDSAT data and processed it into various categories to detail urban expansion. PADCO crews spot checked the results, and correlations were established.

1985-01-01

388

LIGHTPC Accuracy Study.  

National Technical Information Service (NTIS)

This report documents the results of a USAFETAC study of the accuracy of LIGHTPC and ICE PC small computer programs, both of which were used to compute astronomical data such as sunrise, sunset, moonrise, and moonset. It presents error distributions for p...

M. C. Peterson

1992-01-01

389

Pangnirtung: A Community Study.  

ERIC Educational Resources Information Center

This booklet provides reference materials for teachers of social studies in the Northwest Territories (Canada). The information was gathered during workshops attended by elders, community representatives, and teachers from the region. A geography section describes the location of Pangnirtung on Baffin Island and the geology, climate, vegetation,…

Benyk, Pearl, Ed.

390

Advanced commercial tokamak study  

SciTech Connect

Advanced commercial tokamak studies were performed by the Fusion Engineering Design Center (FEDC) as a participant in the Tokamak Power Systems Studies (TPSS) project coordinated by the Office of Fusion Energy. The FEDC studies addressed the issues of tokamak reactor cost, size, and complexity. A scoping study model was developed to determine the effect of beta on tokamak economics, and it was found that a competitive cost of electricity could be achieved at a beta of 10 to 15%. The implications of operating at a beta of up to 25% were also addressed. It was found that the economics of fusion, like those of fission, improve as unit size increases. However, small units were found to be competitive as elements of a multiplex plant, provided that unit cost and maintenance time reductions are realized for the small units. The modular tokamak configuration combined several new approaches to develop a less complex and lower cost reactor. The modular design combines the toroidal field coil with the reactor structure, locates the primary vacuum boundary at the reactor cell wall, and uses a vertical assembly and maintenance approach. 12 refs., 19 figs.

Thomson, S.L.; Dabiri, A.E.; Keeton, D.C.; Brown, T.G.; Bussell, G.T.

1985-12-01

391

DETROIT CHILDREN'S HEALTH STUDY  

EPA Science Inventory

The Detroit Children's Health Study will consist of health questionnaires for 15,000 children enrolled in the fourth- and fifth-grades of selected elementary schools, and measurements of lung function and exhaled breath in a subset of 3,500 of these children. Participation in bo...

392

Sweden's largest Facebook study  

Microsoft Academic Search

The emergence of the Internet has made it easier for people to socially interact than ever before. Today, the most popular channel is Facebook with over 845 million users world wide. In Sweden, the number of users amount to approximately half of the population. We had two aims with this study. First, we investigate which areas of Facebook usage that

Leif Denti; Isak Barbopoulus; Ida Nilsson; Linda Holmberg; Magdalena Thulin; Malin Wendeblad; Lisa Andén; Emelie Davidsson

2012-01-01

393

Microbial Field Pilot Study  

Microsoft Academic Search

This report covers progress made during the first year of the Microbial Field Pilot Study project. Information on reservoir ecology and characterization, facility and treatment design, core experiments, bacterial mobility, and mathematical modeling are addressed. To facilitate an understanding of the ecology of the target reservoir analyses of the fluids which support bacteriological growth and the microbiology of the reservoir

R. M. Knapp; M. J. McInerney; D. E. Menzie; J. L. Chisholm

1990-01-01

394

An Ethnic Studies Evolution  

ERIC Educational Resources Information Center

As a student in the Chicana/o studies program at the University of Texas at El Paso (UTEP), Jesse S. Arrieta decided that her classroom instruction about the culture and history of people of Mexican origin wasn't enough. Arrieta, 27, who graduated from UTEP in 2002 before earning a master's in American history from the University of California,…

Boulard, Garry

2006-01-01

395

TRAHC Folklife Study Guides.  

ERIC Educational Resources Information Center

Each of the seven study guides combined in this packet provides a lesson that includes a reading or descriptive narrative of the topic, along with teaching objectives, questions to consider, and suggested classroom activities. Topics covered are: (1) "Introduction to the Concept of Folklife"; (2) "Southern Gospel Music and Song"; (3) "No Brag,…

Texarkana Regional Arts and Humanities Council, Inc., TX.

396

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

397

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

398

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

399

Arc electrode interaction study  

NASA Technical Reports Server (NTRS)

The project consisted of two parts: (1) the cathode interaction studies which were a continuation of previous work and had the objective of increasing our understanding of the microscopic phenomena controlling cathode erosion in arc jet thrusters, and (2) the studies of the anode attachment in arc jet thrusters. The cathode interaction studies consisted of (1) a continuation of some modeling work in which the previously derived model for the cathode heating was applied to some specific gases and electrode materials, and (2) experimental work in which various diagnostics was applied to the cathode. The specific diagnostics used were observation of the cathode tip during arcing using a Laser Strobe Video system in conjunction with a tele-microscope, a monochromator with an optical multichannel analyzer for the determination of the cathode temperature distribution, and various ex situ materials analysis methods. The emphasis of our effort was shifted to the cathode materials analysis because a parallel project was in place during the second half of 1993 with a visiting scientist pursuing arc electrode materials studies. As a consequence, the diagnostic investigations of the arc in front of the cathode had to be postponed to the first half of 1994, and we are presently preparing these measurements. The results of last year's study showed some unexpected effects influencing the cathode erosion behavior, such as increased erosion away from the cathode tip, and our understanding of these effects should improve our ability to control cathode erosion. The arc jet anode attachment studies concentrated on diagnostics of the instabilities in subsonic anode attachment arc jet thrusters, and were supplemental measurements to work which was performed by one of the authors who spent the summer as an intern at NASA Lewis Research Center. A summary of the results obtained during the internship are included because they formed an integral part of the study. Two tasks for 1994, the diagnostics of the anode closure phenomenon, and the use of arc jet thrusters for the deposition of c-BN, are being prepared.

Zhou, X.; Berns, D.; Heberlein, J.

1994-01-01

400

Tire footprint studies  

NASA Astrophysics Data System (ADS)

This presentation covers the results of tire footprint studies conducted in the Landing Gear Development Facility of the USAF Wright Laboratory at the Wright Patterson Air force Base, OH. Tire footprint studies are essential in understanding tire wear mechanisms and computing tire tread wear rates. The power input into the tread is the driving force for tread wear. Variables needed for power input calculations include the footprint pressure and slip velocity distributions. Studies were performed on the effects of power input distributions due to vertical load, camber, yaw, inflation pressure, and tire construction. For the present study, two tire constructions, one radial and the other bias, were selected. These tires were for the F-16 Block 30 fighter aircraft, both of which were previously worn. The present study was limited to steady straight roll with a 14,000 lb vertical load, a 310 psi inflation pressure, and zero yaw and camber. All tests were conducted on the Tire Force Machine (TFM) with a specialized sensor plate with embedded pressure sensors (X, Y, and Z) and slip sensors (X and Y). All tests were conducted for a table speed of 1 in/s. Tests on the TFM show that the power intensity distributions and total power for both tire constructions are quite similar for straight roll. Later on, tests were also conducted on a modified dynamometer which was overlaid with a grit wear surface. The tire speed was maintained at 40 miles per hour and yaw was set to four degrees. Dynamometer tests showed that radial tires have more tread wear than the bias tire; however, in the field, radial tires have longer life.

Chawla, Mangal; Medzorian, John

1995-08-01

401

Tire footprint studies  

NASA Technical Reports Server (NTRS)

This presentation covers the results of tire footprint studies conducted in the Landing Gear Development Facility of the USAF Wright Laboratory at the Wright Patterson Air force Base, OH. Tire footprint studies are essential in understanding tire wear mechanisms and computing tire tread wear rates. The power input into the tread is the driving force for tread wear. Variables needed for power input calculations include the footprint pressure and slip velocity distributions. Studies were performed on the effects of power input distributions due to vertical load, camber, yaw, inflation pressure, and tire construction. For the present study, two tire constructions, one radial and the other bias, were selected. These tires were for the F-16 Block 30 fighter aircraft, both of which were previously worn. The present study was limited to steady straight roll with a 14,000 lb vertical load, a 310 psi inflation pressure, and zero yaw and camber. All tests were conducted on the Tire Force Machine (TFM) with a specialized sensor plate with embedded pressure sensors (X, Y, and Z) and slip sensors (X and Y). All tests were conducted for a table speed of 1 in/s. Tests on the TFM show that the power intensity distributions and total power for both tire constructions are quite similar for straight roll. Later on, tests were also conducted on a modified dynamometer which was overlaid with a grit wear surface. The tire speed was maintained at 40 miles per hour and yaw was set to four degrees. Dynamometer tests showed that radial tires have more tread wear than the bias tire; however, in the field, radial tires have longer life.

Chawla, Mangal; Medzorian, John

1995-01-01

402

TableofContentsEnvironmentalStudies Table of Contents Environmental Studies  

E-print Network

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347 · Environmental Politics: Development, Globalization and Justice345 TableofContents­EnvironmentalStudies Table of Contents ­ Environmental Studies Faculty of Environmental Studies . . . . . . . . . . . . . . . . 347 The Bachelor in Environmental Studies

403

STUDY PROTOCOL Open Access  

E-print Network

controlled trial of improvisational music therapy’s effectiveness for children with autism spectrum disorders (TIME-A): study protocol Monika Geretsegger 1,2, Ulla Holck 1 and Christian Gold 3* Background: Previous research has suggested that music therapy may facilitate skills in areas typically affected by autism spectrum disorders such as social interaction and communication. However, generalisability of previous findings has been restricted, as studies were limited in either methodological accuracy or the clinical relevance of their approach. The aim of this study is to determine effects of improvisational music therapy on social communication skills of children with autism spectrum disorders. An additional aim of the study is to examine if variation in dose of treatment (i.e., number of music therapy sessions per week) affects outcome of therapy, and to determine cost-effectiveness. Methods/Design: Children aged between 4;0 and 6;11 years who are diagnosed with autism spectrum disorder will be randomly assigned to one of three conditions. Parents of all participants will receive three sessions of parent counselling (at 0, 2, and 5 months). In addition, children randomised to the two intervention groups will be offered individual, improvisational music therapy over a period of five months, either one session (low-intensity) or three sessions (high-intensity) per week. Generalised effects of music therapy will be measured using standardised scales completed by blinded assessors (Autism Diagnostic Observation Schedule, ADOS) and parents (Social Responsiveness Scale, SRS) before and 2, 5, and 12 months after randomisation. Cost effectiveness will be calculated as man years. A group sequential design with first interim look at N = 235 will ensure both power and efficiency. Discussion: Responding to the need for more rigorously designed trials examining the effectiveness of music therapy in autism spectrum disorders, this pragmatic trial sets out to generate findings that will be well generalisable to clinical practice. Addressing the issue of dose variation, this study’s results will also provide information on the relevance of session frequency for therapy outcome.

unknown authors

404

Urban Commerce and Security Study Urban Commerce and Security Study  

E-print Network

Urban Commerce and Security Study Urban Commerce and Security Study Contact Information Fred S necessarily in conflict? That is the question underlying a new study, the Urban Commerce and Security Study environment #12;Urban Commerce and Security Study 2 Urban Commerce and Security Study Introduction

405

LOXT mirror design study  

NASA Technical Reports Server (NTRS)

The final report for the large orbiting X-ray telescope (LOXT) high resolution mirror design study is presented. The following tasks were performed: (1) Generation of a reference and alternate preliminary design for the LOXT high resolution mirror assembly, which will meet the LOXT scientific requirements, and are within the present state of the art of materials and fabrication techniques. (2) Measurement, in X-rays, of the scattering properties of a variety of optical flats, embodying materials, coatings, and polishing techniques which might be applicable to the flight configuration LOXT high resolution mirror. (3) Preparation of a procurement specification for a paraboloid test mirror of the size of the innermost paraboloid of the high resolution mirror assembly, including the design requirements for the reference design evolved from this preliminary design study. The results of the engineering and scientific analysis and the conclusions drawn are presented. The procurement specification for the test mirror is included.

Vanspeybroeck, L.; Antrim, W.; Boyd, D.; Giacconi, R.; Sinnamon, G.; Stille, F.

1972-01-01

406

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.).

407

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.

Jefferson, Anne

408

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

409

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

410

PSU Case Studies  

NSDL National Science Digital Library

How does one teach ethics? It can be a difficult subject and different fields (medicine, law, and so on) all have different ethical considerations and issues. This fine collection of engineering case studies from the Pennsylvania State University College of Engineering brings together resources from a variety of universities that have worked to address this matter. The cases are divided into separate areas that include Developing and Using Case Studies, General Science Cases, and Research Integrity Cases. Visitors shouldn't miss the bulk of the material covered in the General Engineering Cases area, which includes high-quality and contemplative materials on engineering practice ethics from SUNY-Buffalo and the National Science Foundation. The site is rounded out by a number of helpful cases developed in-house by Penn State engineering students.

2013-04-26

411

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

412

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

413

Repository seals requirement 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. 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

414

Remote connector development study  

SciTech Connect

Plutonium-uranium extraction (PUREX) connectors, the most common connectors used at the Hanford site, offer a certain level of flexibility in pipe routing, process system configuration, and remote equipment/instrument replacement. However, these desirable features have inherent shortcomings like leakage, high pressure drop through the right angle bends, and a limited range of available pipe diameters that can be connect by them. Costs for construction, maintenance, and operation of PUREX connectors seem to be very high. The PUREX connector designs include a 90{degree} bend in each connector. This increases the pressure drop and erosion effects. Thus, each jumper requires at least two 90{degree} bends. PUREX connectors have not been practically used beyond 100 (4 in.) inner diameter. This study represents the results of a survey on the use of remote pipe-connection systems in US and foreign plants. This study also describes the interdependence between connectors, remote handling equipment, and the necessary skills of the operators.

Parazin, R.J.

1995-05-01

415

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

416

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

417

2007 CEO Compensation Study  

NSDL National Science Digital Library

Charity Navigator provides high-quality information about charities in order "to advance a more efficient and responsive philanthropic marketplace." One of the more recently published studies is the 2007 CEO Compensation Study. Visitors can read this annotated report here in its entirety, and it contains a wealth of information about the subject. In the year 2007, their research shows that the top leaders of the 5242 largest charities in America earn an average salary of $145,270. While this amount may strike some as rather large, the report also notes that CEO compensation accounts for just 3.37% of the average organization's spending. The report contains a number of helpful charts, such as those that list average CEO salary by geographic region and by size of charity.

2007-08-01

418

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

419

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

420

Civil missions applications study  

NASA Technical Reports Server (NTRS)

This study collects and categorizes a forecast of ambitious civilian space missions; it also assesses their requirements for power and the application of space nuclear power systems to meet these needs. Although the results of this 1986 study have been recast to reflect recent NASA planning (Ride's Bold New Initiatives), the basic mission and power requirements forecast remain essentially the same. Civil mission applications have been organized into four major areas with one additional topic: (1) Earth orbiting missions (including Space Stations, Earth Observing Missions, and materials processing); (2) Planetary exploration; (3) Manned lunar base; and (4) Manned Mars Mission; plus (5) Extra-solar spacecraft (i.e., the Thousand AU explorer concept).

Mankins, John Carlton; Olivieri, Jerry

1988-01-01

421

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.

422

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

423

EUROv Super Beam Studies  

SciTech Connect

Neutrino Super Beams use conventional techniques to significantly increase the neutrino beam intensity compared to the present neutrino facilities. An essential part of these facilities is an intense proton driver producing a beam power higher than a MW. The protons hit a target able to accept the high proton beam intensity. The produced charged particles are focused by a system of magnetic horns towards the experiment detectors. The main challenge of these projects is to deal with the high beam intensity for many years. New high power neutrino facilities could be build at CERN profiting from an eventual construction of a high power proton driver. The European FP7 Design Study EUROv, among other neutrino beams, studies this Super Beam possibility. This paper will give the latest developments in this direction.

Dracos, Marcos [IPHC, Universite de Strasbourg, CNRS/IN2P3, F-67037 Strasbourg (France)

2011-10-06

424

Postmortem studies in schizophrenia  

PubMed Central

For over a century, postmortem studies have played a central part in the search for the structural and biochemical pathology of schizophrenia. However, for most of this time, little progress has been made. Recently, the situation has begun to change, helped by the emergence of more powerful methodologies and research designs, and by the availability of brain imaging to provide complementary information. As a result, it can now be clearly concluded that there are structural cerebral abnormalities in schizophrenia that are intrinsic to the disorder. The neuropathological process is not primarily degenerative, but involves a change in the normal cytoarchitecture of the brain, probably originating in development. Neurochemically, there is postmortem evidence for alterations in several transmitter systems including dopamine, glutamate, serotonin, and ?-aminobutyric acid (GABA). The cardinal findings are reviewed here, together with a consideration of the conceptual and methodological issues that face postmortem studies of schizophrenia. PMID:22033474

Harrison, Paul J.

2000-01-01

425

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.

426

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 patientâÂÂs brain are included in this case study. The official diagnosis found in the âÂÂFinal Diagnosisâ section is accompanied by a discussion of the contributing doctorâÂÂs 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 patientâÂÂs conditions.

French, Jacqueline A.; Mcgarvey, Michael; Mourelatos, Zissimos; Wells, Gregg

2008-12-29

427

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

428

Pharmacological studies on zopiclone.  

PubMed

Zopiclone (RP 27 267) is an hypnotic with a chemical structure different from that of the benzodiazepines (BZD) or barbiturates. Studies of zopiclone in classical psycho-pharmacological tests, in comparison with BZD and barbiturates, have shown that it exhibits the five main types of activity considered as characteristic of the pharmacological profile of BZD and partly of that of barbiturates (anticonvulsant, myorelaxant, antiaggressive, sedative-hypnotic and 'anticonflict'). However, like BZD, zopiclone differs from barbiturates by a high safety margin. Electrophysiological studies performed in cats have shown that zopiclone induces modifications in sleep-wakefulness pattern which are close to those observed with BZD, specially with nitrazepam. Moreover, zopiclone increases the threshold for arousal by reticular formation stimulation, rather more than nitrazepam, but with a shorter duration of action. The short duration of action of zopiclone has been demonstrated in other species using different tests. PMID:6145682

Julou, L; Bardone, M C; Blanchard, J C; Garret, C; Stutzmann, J M

1982-01-01

429

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.

430

Study of atmospheric dynamics  

NASA Technical Reports Server (NTRS)

In order to better understand the dynamics of the global atmosphere, a data set of precision temperature measurements was developed using the NASA built Microwave Sounding Unit. Modeling research was carried out to validate global model outputs using various satellite data. Idealized flows in a rotating annulus were studied and applied to the general circulation of the atmosphere. Dynamic stratospheric ozone fluctuations were investigated. An extensive bibliography and several reprints are appended.

Mcnider, Richard T.; Christy, John R.; Cox, Gregory N.

1993-01-01

431

QUADRENNIAL MCNP TIMING STUDY  

SciTech Connect

The Los Alamos National Laboratory Monte Carlo N-Particle radiation transport code, MCNP, is widely used around the world for many radiation protection and shielding applications. As a well-known standard it is also an excellent vehicle for assessing the relative performance of scientific computing platforms. Every three-to-four years a new version of MCNP is released internationally by the Radiation Safety Information Computational Center (RSICC) in Oak Ridge, Tennessee. For each of the past few releases, we have also done a timing study to assess the progress of scientific computing platforms and software. These quadrennial timing studies are valuable to the radiation protection and shielding community because (a) they are performed by a recognized scientific team, not a computer vendor, (b) they use an internationally recognized code for radiation protection and shielding calculations, (c) they are eminently reproducible since the code and the test problems are internationally distributed. Further, if one has a computer platform, operating system, or compiler not presented in our results, its performance is directly comparable to the ones we report because it can use the same code, data, and test problems as we used. Our results, using a single processor per platform, indicate that hardware advances during the past three years have improved performance by less than a factor of two and software improvements have had a marginal effect on performance. The most significant impacts on performance have resulted from developments in multiprocessing and multitasking. The other most significant advance in the last three years has been the accelerated improvements in personal computers. In the last timing study, the tested personal computer was approximately a factor of four slower that the fastest machine tested, a DEC Alphastation 500. In the present study, the fastest PC tested was less than a factor of two slower than the fastest platform, which is a Compaq (previously DEC) Alpha XP1000.

E. C. SELCOW; B. D. LANSRUD

2000-09-01

432

Women's Health Study (WHS)  

Cancer.gov

The Women's Health Study (WHS) is a randomized, double-blind, placebo-controlled trial using a 2x2 factorial design, and conducted among 39,876 female health professionals in the United States. The WHS is sponsored by both the National Cancer Institute (NCI) and the National Heart, Lung, and Blood Institute (NHLBI). Participants were randomly assigned to either Vitamin E (600 IU every other day) or placebo; and to aspirin (100 mg every other day) or placebo.

433

Riociguat: PATENT-1 Study  

PubMed Central

Stimulators of soluble guanylate cyclase (sCG) are novel pharmacological agents that directly stimulate sGC. Ongoing research on sGC stimulators led to the development of the more potent and more specific sGC stimulator, riociguat. Recently, the US Food and Drug Administration has approved riociguat to treat pulmonary arterial hypertension in adults. Support for the approval of riociguat comes from the recently published PATENT-1 (Pulmonary Arterial Hypertension Soluble Guanylate Cyclase–Stimulator Trial 1) study.

Said, Karim

2014-01-01

434

Solar Coronal Structure Study  

NASA Technical Reports Server (NTRS)

The subject of this investigation is the study the physics of the solar corona through the analysis of the EUV and UV data produced by two flights (12 May 1992 and 25 April 1994) of the Lockheed Solar Plasma Diagnostics Experiment (SPDE) sounding rocket payload, in combination with Yohkoh and groundbased data. These joint datasets are useful for understanding the physical state of the solar atmosphere from the photosphere to the corona at the time of the rocket flights. Each rocket flight produced both spectral and imaging data. Highlights of this initial year of the contract included compilation, scaling and co-alignment of image sets, substantial progress on the Bright Point study, initial work on the Active Region and Large Scale Structure studies, DRSC slit-aspect determination work and calibration activities. One paper was presented at the 1997 Annual Meeting of the AAS/SPD in Bozeman, Montana. An initial set of calibrated spectra were placed into the public domain via the World Wide Web. Three Quarterly Progress Reports have been submitted; progress for the fourth quarter of the contract is summarized in this Final Contract Report. The intent of the investigation is to compare the physics of small- and medium-scale structure with that of large-scale structures with weak fields. A study has been identified in each size domain. The calibration of the rocket data forms an important element of the work. Of equal importance is the slit-aspect solution, which determines the correspondence between locations along the spectrograph slit and points on the solar disk.

Bruner, Marilyn E.; Saba, Julia; Strong, Keith; Nitta, Nariaki; Harvey, Karen

1997-01-01

435

Study of bipolar batteries  

Microsoft Academic Search

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

J. E. Clifford

1984-01-01

436

Flash Rust & Waterjetting Study  

SciTech Connect

Certain areas of the primary wall in the AY-101 tank annulus are being cleaned with a remotely operated waterjet. There is some concern on how it will effect the surface of the tank wall after cleaning and how to prevent rust and corrosion from developing on the wall in the future. This study addresses the cause and effects of flash rust, which typically develops on steel surfaces after the waterjetting process.

DORSH, P.M..

2001-11-14

437

River Studies Web Page  

NSDL National Science Digital Library

The Marquette University High School Science Club is concerned about the water quality of the rivers and streams in the Milwaukee River watershed. The River Studies project homepage provides information on determining water quality via aquatic invertebrate and chemical analyses. The site also lists the results of water quality testing performed on various Wisconsin rivers. Links to the Watershed Newsletter, Testing the Waters participants, and Project FIRST members complete the site.

438

Journal of Millennial Studies  

NSDL National Science Digital Library

This online journal is produced by the Center for Millennial Studies, an organization devoted to archiving apocalyptic literature and analyzing millenarianism. The inaugural issue contains five articles and a book review in .pdf format. These include: "Religion INK.: Tabloid Crucifiction (Whose Apocalypse? When?)," "Jewish Shock-Troops of the Apocalypse: Antichrist and the End, 1200-1600," and "The Mongols and non-believing apocalyptic friends around the year 1260."

1998-01-01

439

General Entomology Study Materials  

NSDL National Science Digital Library

Another of Dr. John Meyer's excellent webpages devoted to teaching general entomology. This page includes five links that take you to "spot ID" characters for insect orders and some families. This page has some excellent photographs detailing the significant characteristics and an interactive phylogenetic tree. A second link takes you to a summary by family of important characteristics. Further links show old tests and quizzes for study reference.

0002-11-30

440

Agricultural Health Study  

Cancer.gov

This study explores potential causes of cancer and other diseases among farmers and their families and among commercial pesticide applicators. Current medical research suggests that while agricultural workers are generally healthier than the general U.S. population, they may have higher rates of some cancers, including leukemia, myeloma, non-Hodgkin's lymphoma, and cancers of the lip, stomach, skin, brain, and prostate. Other conditions, like asthma, neurologic disease, and adverse reproductive outcomes may also be related to agricultural exposures.

441

AE aeronomy studies  

NASA Technical Reports Server (NTRS)

Chemical processes in the thermosphere and ionosphere using AE data were studied. These data were analyzed and interpreted in such a way as to verify and correct laboratory measured rate coefficients, obtain values for rate coefficients not measured in the laboratory, and to reveal and correct inadequacies in existing models of thermospheric chemistry. This activity stimulated new work in the laboratory measurement of rate coefficients by revealing errors in existing measurements and by suggesting new measurements that need to be made.

Walker, J. C. G.

1983-01-01

442

Fossil crinoid studies  

E-print Network

THE UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS October 1, 1969 Paper 42 FOSSIL CRINOID STUDIES HARRELL L. STRIMPLE, C. O. LEVORSON, MICHAEL R. MCGINNIS, RAYMOND C. MooRE, and AMEL PRIEST CONTENTS PAGE PART 1. NEW LECANOCRINID FROM... PENNSYLVANIAN OF OKLAHOMA (Harrell L. Strimple, with Addendum by Raymond C. Moore) 1 PART 2. UPPER PENNSYLVANIAN ANOBASICRINID FROM NEW MEXICO (Harrell L. Strimple) 8 PART 3. PENNSYLVANIAN CRINOIDS FROM OHIO AND OKLAHOMA (Harrell L. Strimple) 11 PART 4...

Strimple, H. L.; Levorson, C. O.; McGinnis, M. R.; Moore, R. C.; Priest, A.

1969-10-01

443

Software breadboard study  

NASA Technical Reports Server (NTRS)

The overall goal of this study was to develop new concepts and technology for the Comet Rendezvous Asteroid Flyby (CRAF), Cassini, and other future deep space missions which maximally conform to the Functional Specification for the NASA X-Band Transponder (NXT), FM513778 (preliminary, revised July 26, 1988). The study is composed of two tasks. The first task was to investigate a new digital signal processing technique which involves the processing of 1-bit samples and has the potential for significant size, mass, power, and electrical performance improvements over conventional analog approaches. The entire X-band receiver tracking loop was simulated on a digital computer using a high-level programming language. Simulations on this 'software breadboard' showed the technique to be well-behaved and a good approximation to its analog predecessor from threshold to strong signal levels in terms of tracking-loop performance, command signal-to-noise ratio and ranging signal-to-noise ratio. The successful completion of this task paves the way for building a hardware breadboard, the recommended next step in confirming this approach is ready for incorporation into flight hardware. The second task in this study was to investigate another technique which provides considerable simplification in the synthesis of the receiver first LO over conventional phase-locked multiplier schemes and in this approach, provides down-conversion for an S-band emergency receive mode without the need of an additional LO. The objective of this study was to develop methodology and models to predict the conversion loss, input RF bandwidth, and output RF bandwidth of a series GaAs FET sampling mixer and to breadboard and test a circuit design suitable for the X and S-band down-conversion applications.

Nuckolls, C.; Frank, Mark

1990-01-01

444

Electron microscope studies  

NASA Astrophysics Data System (ADS)

This year our laboratory has continued to make progress in the design of electron-optical systems, in the study of structure-function relationships of large multi-subunit proteins, in the development of new image processing software and in achieving a workable sub-angstrom STEM. We present an algebraic approach to the symmetrical Einzel (unipotential) lens wherein we simplify the analysis by specifying a field shape that meets some preferred set of boundary or other conditions and then calculate the fields. In a second study we generalize this approach to study of three element electrostatic lenses of which the symmetrical Einzel lens is a particular form. The purpose is to develop a method for assisting in the design of a lens for a particular purpose. In our biological work we study a stable and functional dodecameric complex of globin chains from the hemoglobin of Lumbricus terrestris. This is a complex lacking the 'linker' subunit first imaged in this lab and required for maintenance of the native structure. In addition, we do a complete work-up on the hemoglobin of the marine polychaete Eudistylia vancouverii, demonstrating the presence of a hierarchy of globin complexes. We demonstrate stable field-emission in the sub-angstrom STEM and the preliminary alignment of the beam. We continue our exploration of a algorithms for alignment of sequences of protein and DNA. Our computer facilities now include four second generation RISC workstations and we continue to take increasing advantage of the floating-point and graphical performance of these devices.

Crewe, A. V.; Kapp, O. H.

1991-06-01

445

Integrated optics technology study  

NASA Technical Reports Server (NTRS)

The materials and processes available for the fabrication of single mode integrated electrooptical components are described. Issues included in the study are: (1) host material and orientation, (2) waveguide formation, (3) optical loss mechanisms, (4) wavelength selection, (5) polarization effects and control, (6) laser to integrated optics coupling,(7) fiber optic waveguides to integrated optics coupling, (8) souces, (9) detectors. The best materials, technology and processes for fabrication of integrated optical components for communications and fiber gyro applications are recommended.

Chen, B.

1982-01-01

446

Update on Ion Studies  

E-print Network

The effect of ions has received one of the highest priorities in R&D for the damping rings of the International Linear Collider(ILC). It is detrimental to the performance of the electron damping ring. In this note, an update concerning the ion studies for the ILC damping ring is given. We investigate the gap role and irregular fill pattern in the ring.The ion density reduction in different fills is calculated analytically. Simulation results are also presented.

Xia, Guoxing

2007-01-01

447

Update on Ion Studies  

E-print Network

The effect of ions has received one of the highest priorities in R&D for the damping rings of the International Linear Collider(ILC). It is detrimental to the performance of the electron damping ring. In this note, an update concerning the ion studies for the ILC damping ring is given. We investigate the gap role and irregular fill pattern in the ring.The ion density reduction in different fills is calculated analytically. Simulation results are also presented.

Guoxing Xia; Eckhard Elsen

2007-09-14

448

Institute of Development Studies  

NSDL National Science Digital Library

Located in Sussex, England, the Institute of Development Studies (IDS) is an international authority on development. IDS serves as a center for research and education on development and offers conferences and workshops, as well as a host of online information about research and publications. Full-text working and discussion papers are available online, as are several special research reports and descriptions of projects on such subjects as Globalization, Governance and Civil Society, and Environment.

449

Laser Initiated Actuator study  

SciTech Connect

The program task was to design and study a laser initiated actuator. The design of the actuator is described, it being comprised of the fiber and body subassemblies. The energy source for all experiments was a Spectra Diode 2200-H2 laser diode. The diode is directly coupled to a 100 micron core, 0.3 numerical aperture fiber optic terminated with an SMA connector. The successful testing results are described and recommendations are made.

Watson, B.

1991-06-27

450

Luxembourg Income Study  

NSDL National Science Digital Library

The Luxembourg Income Study (LIS) is a cooperative multinational research project located at the CEPS/INSTEAD Institute in Differdange, Luxembourg. Created in 1983 to promote comparative research on the economic status of populations in different countries, the project now has 25 participating countries. The site provides technical information, a newsletter, and working papers related to the project. It contains useful information about LIS datasets.

2000-01-01

451

Electron microscope studies  

SciTech Connect

This year our laboratory has continued to make progress in the design of electron-optical systems, in the study of structure-function relationships of large multi-subunit proteins, in the development of new image processing software and in achieving a workable sub-angstrom STEM. We present an algebraic approach to the symmetrical Einzel (unipotential) lens wherein we simplify the analysis by specifying a field shape that meets some preferred set of boundary or other conditions and then calculate the fields. In a second study we generalize this approach to study of three element electrostatic lenses of which the symmetrical Einzel lens is a particular form. The purpose is to develop a method for assisting in the design of a lens for a particular purpose. In our biological work we study a stable and functional dodecameric complex of globin chains from the hemoglobin of Lumbricus terrestris. This is a complex lacking the linker'' subunit first imaged in this lab and required for maintenance of the native structure. In addition, we do a complete work-up on the hemoglobin of the marine polychaete Eudistylia vancouverii demonstrating the presence of a hierarchy of globin complexes. We demonstrate stable field-emission in the sub-angstrom STEM and the preliminary alignment of the beam. We continue our exploration of a algorithms for alignment of sequences of protein and DNA. Our computer facilities now include four second generation RISC workstations and we continue to take increasing advantage of the floating-point and graphical performance of these devices.

Crewe, A.V.; Kapp, O.H.

1991-06-01

452

Singapore Chinese Health Study  

Cancer.gov

The current research project continues support for a residential cohort of 63,257 middle-aged and older (45 to 74 years of age) Singapore Chinese men and women accrued between 1993 and 1998. At recruitment, each study participant was interviewed in person by a trained interviewer using a structured questionnaire that emphasized current diet assessed via a validated, 165-item food frequency questionnaire.

453

Shanghai Cohort Study  

Cancer.gov

The Shanghai Cohort Study consists of 18,244 men in Shanghai, China, assembled during 1986-1989 when subjects were between the ages of 45 and 64 years. At recruitment, all cohort members provided detailed dietary and medical histories as well as blood and urine specimens. In the follow-up of 2000-2001, buccal cells were collected from 13,815 original cohort participants (92% of all surviving cohort members).

454

Mars Rover RTG Study  

SciTech Connect

This report summarizes the results of a Radioisotope Thermoelectric Generator (RTG) design study conducted by Fairchild Space Company at the direction of the U.S. Department of Energy's Office of SpecialApplications, in suppport of the Mars Rover and Sample Return mission under investigation at NASA's Jet Propulsion Laboratory. The report is a rearranged, updated, and significantly expanded amalgam of three interrelated papers presented at the 24th Intersocity Energy Conversion Engineering Conference (IECEC) at Arlington, Virginia, on August 10, 1989.

Schock, Alfred

1989-08-25

455

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

456

Morphotectonic study of Hispaniola  

Microsoft Academic Search

Geomorphological analysis; aerial photographs; and geomorphologic, geological, geophysical, topographical, and field studies\\u000a show that the morphology of Hispaniola can be linked to lateral variations in the geometry and tectonism of the Caribbean-North\\u000a American Plate Boundary Zone. Three main categories of the relief were established: territorial units (1 megablock, 2 macroblocks,\\u000a 14 mesoblocks, 209 blocks, 401 microblocks, and 527 nanoblocks), morphostructural

M. O. Cotilla; D. Córdoba; M. Calzadilla

2007-01-01

457

Microengineered cathode interface studies  

SciTech Connect

The overpotential at the cathode/electrolyte interface has been recognized as an important limitation on the performance of solid oxide fuel cells (SOFCs). This project is an effort to gain a scientific understanding of which interface features and conditions contribute to cathode polarization in SOFCs. The paper discusses three possible rate-limiting factors in the cathode reaction. The paper studies the electronic conductivity in the electrolyte, the ionic conductivity in the cathode, cathode geometry near the interface, and cathode surface area.

Kueper, T.; Doshi, R.; Krumpelt, M. [Argonne National Lab., IL (United States). Electrochemical Technology Program

1996-10-01

458

Baltimore Ecosystem Study  

NSDL National Science Digital Library

Many ecologists work to understand how various parts of a given ecological system work or function with other systems in their vicinity, but relatively few attempt to bring together all of this work with major urban areas. One such impressive project is the Baltimore Ecosystem Study, which aims to understand metropolitan Baltimore as an ecological system; and in doing so, bring together researchers from the biological, physical and social sciences to work on this formidable task that is truly interdisciplinary. At the site, visitors can learn about the staff of the project and read about its various thematic areas of inquiry, including biodiversity, education, soil, stream and watershed studies, and vegetation. A good place to start before diving into the numerous research projects would be the research area, which explains the basic goals of the project, the theories that the research team is drawing on, and the central questions of its work. The Baltimore Ecosystem Study has also been approved for use in classrooms by the American Association for the Advancement of Science, and educators will find materials that they can draw on to teach various concepts and ideas here as well.

459

Cutter Connectivity Bandwidth Study  

NASA Astrophysics Data System (ADS)

The goal of this study was to determine how much bandwidth is required for cutters to meet emerging data transfer requirements. The Cutter Connectivity Business Solutions Team with guidance front the Commandant's 5 Innovation Council sponsored this study. Today, many Coast Guard administrative and business functions are being conducted via electronic means. Although our larger cutters can establish part-time connectivity using commercial satellite communications (SATCOM) while underway, there are numerous complaints regarding poor application performance. Additionally, smaller cutters do not have any standard means of underway connectivity. The R&D study shows the most important factor affecting web performance and enterprise applications onboard cutters was latency. Latency describes the time it takes the signal to reach the satellite and come back down through space. The latency due to use of higher orbit satellites is causing poor application performance and inefficient use of expensive SATCOM links. To improve performance, the CC must, (1) reduce latency by using alternate communications links such as low-earth orbit satellites, (2) tailor applications to the SATCOM link and/or (3) optimize protocols used for data communication to minimize time required by present applications to establish communications between the user and the host systems.

2002-10-01

460

The safeguards options study  

SciTech Connect

The Safeguards Options Study was initiated to aid the International Safeguards Division (ISD) of the DOE Office of Arms Control and Nonproliferation in developing its programs in enhanced international safeguards. The goal was to provide a technical basis for the ISD program in this area. The Safeguards Options Study has been a cooperative effort among ten organizations. These are Argonne National Laboratory, Brookhaven National Laboratory, Idaho National Engineering Laboratory, Lawrence Livermore National Laboratory, Los Alamos National Laboratory, Mound Laboratory, Oak Ridge National Laboratory, Pacific Northwest Laboratories, Sandia National Laboratories, and Special Technologies Laboratory. Much of the Motivation for the Safeguards Options Study is the recognition after the Iraq experience that there are deficiencies in the present approach to international safeguards. While under International Atomic Energy Agency (IAEA) safeguards at their declared facilities, Iraq was able to develop a significant weapons program without being noticed. This is because negotiated safeguards only applied at declared sites. Even so, their nuclear weapons program clearly conflicted with Iraq`s obligations under the Nuclear Nonproliferation Treaty (NPT) as a nonnuclear weapon state.

Hakkila, E.A.; Mullen, M.F.; Olinger, C.T.; Stanbro, W.D. [Los Alamos National Lab., NM (United States); Olsen, A.P.; Roche, C.T.; Rudolph, R.R. [Argonne National Lab., IL (United States); Bieber, A.M.; Lemley, J. [Brookhaven National Lab., Upton, NY (United States); Filby, E. [Idaho National Engineering Lab., Idaho Falls, ID (United States)] [and others

1995-04-01

461

?-Oligofurans: a computational study.  

PubMed

Recently, ?-oligofurans have emerged as interesting and promising organic electronic materials that have certain advantages over ?-oligothiophenes. In this work, ?-oligofurans were studied computationally, and their properties were compared systematically with those of the corresponding oligothiophenes. Although the two materials share similar electronic structures, overall, this study revealed important differences between ?-oligofurans and ?-oligothiophenes. Twisting studies on oligofurans revealed them to be significantly more rigid than oligothiophenes in the ground state and first excited state. Neutral ?-oligofurans have more quinoid character, higher frontier orbital energies, and higher HOMO-LUMO gaps than their ?-oligothiophene counterparts. The theoretical results suggest that oligofurans (and subsequently polyfuran) have lower ionization potentials than the corresponding oligothiophenes (and polythiophene), which in turn predicts that oligofurans can be lightly doped more easily than oligothiophenes. Oligofuran dications (8?F(2+)-14?F(2+)) of medium-sized and longer chain lengths show a polaron-pair character, and the polycations of ?-oligofurans cannot accommodate high positive charges as easily as their thiophene analogues. PMID:23940018

Sharma, Sagar; Bendikov, Michael

2013-09-23

462

Accelerator research studies  

NASA Astrophysics Data System (ADS)

Our major goal in this experiment is to study the physics of a space-charge dominated beam propagating through a long, periodic transport channel consisting in our case of 38 solenoid lenses two of which are being used to match the beam from the gun into the periodic lattice. In addition, a small separate test stand gives us the capability of studying different electron gun designs including measurements of beam perveance and emittance, beam propagation in drift space and through a single solenoid lens. Most of our transport studies in the periodic channel have been conducted with a 5 keV, 200 mA electron beam from a gun with a 1-inch diameter thermionic cathode. The beam physics phenomena of greatest interest are instabilities due to resonant interaction between the beam and the periodic lattice, non-linear effects due to external forces (e.g., spherical lens aberrations) or due to nonuniform charge distributions, beam off-centering and misalignments which also include the effects of image forces. In principle, all of these effects may lead to emittance growth and beam loss. An important question is whether there exists a window of 100 percent transmission and minimal emittance growth in such a long periodic channel.

1988-03-01

463

ADVANCED CUTTINGS TRANSPORT STUDY  

SciTech Connect

This is the third quarterly progress report for Year 3 of the ACTS Project. It includes a review of progress made in: (1) Flow Loop construction and development and (2) research tasks during the period of time between Jan. 1, 2002 and Mar. 31, 2002. This report presents a review of progress on the following specific tasks: (a) Design and development of an Advanced Cuttings Transport Facility (Task 3: Addition of a Cuttings Injection/Separation System), (b) Research project (Task 6): ''Study of Cuttings Transport with Foam Under LPAT Conditions (Joint Project with TUDRP)'', (c) Research project (Task 9b): ''Study of Foam Flow Behavior Under EPET Conditions'', (d) Research project (Task 10): ''Study of Cuttings Transport with Aerated Mud Under Elevated Pressure and Temperature Conditions'', (e) Research on three instrumentation tasks to measure: Cuttings concentration and distribution in a flowing slurry (Task 11), Foam texture while transporting cuttings. (Task 12), and Viscosity of Foam under EPET (Task 9b); (f) 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); and (g) Activities towards technology transfer and developing contacts with Petroleum and service company members, and increasing the number of JIP members.

Troy Reed; Stefan Miska; Nicholas Takach; Kaveh Ashenayi; Mark Pickell; Len Volk; Mike Volk; Evren Ozbayoglu; Lei Zhou

2002-04-30

464

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

465

Power system commonality study  

NASA Astrophysics Data System (ADS)

A limited top level study was completed to determine the commonality of power system/subsystem concepts within potential lunar and Mars surface power system architectures. A list of power system concepts with high commonality was developed which can be used to synthesize power system architectures which minimize development cost. Examples of potential high commonality power system architectures are given in this report along with a mass comparison. Other criteria such as life cycle cost (which includes transportation cost), reliability, safety, risk, and operability should be used in future, more detailed studies to select optimum power system architectures. Nineteen potential power system concepts were identified and evaluated for planetary surface applications including photovoltaic arrays with energy storage, isotope, and nuclear power systems. A top level environmental factors study was completed to assess environmental impacts on the identified power system concepts for both lunar and Mars applications. Potential power system design solutions for commonality between Mars and lunar applications were identified. Isotope, photovoltaic array (PVA), regenerative fuel cell (RFC), stainless steel liquid-metal cooled reactors (less than 1033 K maximum) with dynamic converters, and in-core thermionic reactor systems were found suitable for both lunar and Mars environments. The use of SP-100 thermoelectric (TE) and SP-100 dynamic power systems in a vacuum enclosure may also be possible for Mars applications although several issues need to be investigated further (potential single point failure of enclosure, mass penalty of enclosure and active pumping system, additional installation time and complexity). There are also technical issues involved with development of thermionic reactors (life, serviceability, and adaptability to other power conversion units). Additional studies are required to determine the optimum reactor concept for Mars applications. Various screening criteria (availability, environmental compatibility, mass competitiveness of energy storage, safety, and practicality for the application) were used to define concept applicability for each lunar and Mars application. A screening study resulted in 13 power systems for lunar applications and 15 for Mars applications. A commonality analysis showed several power systems with potentially high commonality (across both lunar and Mars applications). These high commonality systems include d PVA/RFC, dynamic isotope (1033 K Stirling, 1133 K Brayton, and 1300 K Brayton PCU's), SP-100 TE and dynamic derivatives (Mars systems required vacuum enclosure), in-core thermionic reactor, and liquid metal cooled reactor/Stirling cycle (1033 K). The generic commonality results were used to synthesize 3 high commonality power system architectures: (1) predominantly PV (limited nuclear and isotope), (2) predominantly in-core thermionic reactor/DIPS, and (3) predominantly SP-100 reactor/DIPS. The in-core thermionic reactor/DIPS power system architecture had the lowest total mass. Specific outputs from this study included lists of power system requirements, power system candidates, a power system application matrix, power system characteristics (mass), power system commonality ratings, example high commonality power system architectures, architecture masses, and issues/design solutions for lunar/Mars commonality.

Littman, Franklin D.

1992-07-01

466

Celotex (Registered) Replacement Study  

SciTech Connect

The AL-R8 is the pit storage container in most widespread use at Pantex. The AL-R8 container family consists of standard 20-in.-diameter steel drums, 30 to 60 in. in height, with insulation inserts made of Celotex{reg_sign}--a fiberboard product made from processed sugar cane. Celotex is an acceptable material for inserts in many radioactive material shipping and storage containers. It is a good shock mitigator/insulator, does a fair job in fire protection (when oxygen is excluded), shielding, and criticality, and is inexpensive and easily available. However, the fiberboard absorbs water in humid environments which, when combined with chemical residues in the fiberboard, forms corrosive compounds that can shorten the life of the container and affect container contents. To protect the contents from this potentially damaging environment, the AL-R8 SI was developed to isolate the contents within a sealed stainless steel vessel inside the AL-R8. Although the SI protected the contents, corrosion studies indicated the SI lid bolts might corrode over time and surveillance showed that areas of the outer drum were still subject to corrosion. To address this potential problem, DOE/Albuquerque sponsored bolt and Celotex replacement studies. The bolt replacement study was assigned to Mason and Hanger's Pantex Facility and this Celotex Replacement Study to Lawrence Livermore National Laboratory. The Celotex Replacement Study evaluated options for replacing Celotex with a material that is chemically compatible with the AL-R8 SI container. The evaluation was limited to materials either used previously in nuclear materials shipping and storage containers or materials with known properties in a low-radiation environment. This limitation was set to ensure that the long-term aging effect on the new material is known a priori. Initial material evaluations narrowed the material choices to foam and cork. Although cork performed better than foam in some tests, cork was considered a less advantageous replacement material due to the potential need for additional poisons to avoid criticality concerns for unlimited arrays, potential variability in its performance due to expected variations in natural materials, potential availability concerns for long term use, and increased container weight and cost. For these reasons, an all-foam replacement design was selected for direct comparison to Celotex using the AL-R8 SI test requirements. The materials were compared in drop tests, thermal equilibrium tests, fire tests, and vibration tests. In addition, analyses of the materials were compared for chemical compatibility and structural, thermal, shielding, and criticality performance. The study found the General Plastics FR-3700 Last-A-Foam{reg_sign} family of polyurethane foams to be a good alternative to Celotex and a superior choice for applications where there are material compatibility concerns and fire resistance, thermal and structural performance requirements. The design shown in Figure 5.1.a is an example where a combination of GP FR-3700 series Last-A-Foam materials were used to design a package meeting such requirements. Test and analysis have shown that this design met or exceeded the performance requirements of the AL-R8 SI using Celotex. Based on the tests and analysis conducted to date, the FR-3700 family of foams should be a good candidate to replace Celotex in AL-R8 SI containers. The current estimated cost of the material ({approx}$300/container) could be further reduced by working with the vendor to set up the manufacturing and molding process.

Couture, S; Hafner, R

2002-10-01

467

Ammonia Leak Locator Study  

NASA Technical Reports Server (NTRS)

The thermal control system of International Space Station Alpha will use liquid ammonia as the heat exchange fluid. It is expected that small leaks (of the order perhaps of one pound of ammonia per day) may develop in the lines transporting the ammonia to the various facilities as well as in the heat exchange equipment. Such leaks must be detected and located before the supply of ammonia becomes critically low. For that reason, NASA-JSC has a program underway to evaluate instruments that can detect and locate ultra-small concentrations of ammonia in a high vacuum environment. To be useful, the instrument must be portable and small enough that an astronaut can easily handle it during extravehicular activity. An additional complication in the design of the instrument is that the environment immediately surrounding ISSA will contain small concentrations of many other gases from venting of onboard experiments as well as from other kinds of leaks. These other vapors include water, cabin air, CO2, CO, argon, N2, and ethylene glycol. Altogether, this local environment might have a pressure of the order of 10(exp -7) to 10(exp -6) torr. Southwest Research Institute (SwRI) was contracted by NASA-JSC to provide support to NASA-JSC and its prime contractors in evaluating ammonia-location instruments and to make a preliminary trade study of the advantages and limitations of potential instruments. The present effort builds upon an earlier SwRI study to evaluate ammonia leak detection instruments [Jolly and Deffenbaugh]. The objectives of the present effort include: (1) Estimate the characteristics of representative ammonia leaks; (2) Evaluate the baseline instrument in the light of the estimated ammonia leak characteristics; (3) Propose alternative instrument concepts; and (4) Conduct a trade study of the proposed alternative concepts and recommend promising instruments. The baseline leak-location instrument selected by NASA-JSC was an ion gauge.

Dodge, Franklin T.; Wuest, Martin P.; Deffenbaugh, Danny M.

1995-01-01

468

Platform evolution studies  

NASA Technical Reports Server (NTRS)

The polar orbiting platform (POP), being developed by the Work Package 3 (WP3) Project at the Goddard Space Flight Center, will play a key role in the NASA Leadership Initiative, Mission to Planet Earth (MPE). It becomes, with the addition of payloads, an Earth observation satellite observatory. Mission to Planet Earth also has geostationary platforms (GEOP) as part of its global observational system. A study was begun in March 1988 to assess the applicability of the POP orbital replacement units (ORUs) for a geostationary Earth observing mission. Two test cases, representative of MPE payloads, were studied. Case A was used to emphasize the GEOP configuration and design; it used a Titan/Centaur to achieve orbit. Case B, considered to be much further in the future, included some assembly at the Space Station Freedom manned base and use of an orbital transfer vehicle to achieve orbit; requirements on the manned base to support such a mission were emphasized. The study found the POP systems more than adequate to meet GEOP requirements. Two types of changes were required for the POP ORUs: (1) modification to use only one surface for heat rejection; for the battery ORU, this meant 'opening up' the ORU to retain the radiator area with a corresponding decrease in depth; and (2) deletion of equipment not needed. The Case A configuration was shown to be within the planned capability of the Titan IV/Centaur. Assembly requirements were included for the Case B configuration, which is driven by the large microwave antennas of two of the payloads. The final review was April 19, 1989.

Walton, Barbara A.

1990-01-01

469

Exploratory studies, 1991  

SciTech Connect

The Exploratory Studies Group is dedicated to advanced investigation of accelerators and radiation, primarily in the area of charged-particle beams and photon beams. Its primary mission is to explore the next steps in the development of particle accelerators and storage rings, which are important both for high-energy physics and for the wide range of disciplines now turning to synchrotron-radiation sources and free-electron lasers. Our research is therefore deeply committed to LBL's institutional goal of becoming a center for the generation and use of coherent and incoherent electromagnetic radiation of exceptional brightness, as well as for generic research on the future development of accelerators. A significant fraction of our effort is dedicated to general accelerator-physics research for facilities on the immediate horizon, but a vital part of our activities comprises research into exotic possibilities for charged-particle production, accumulation, acceleration, and storage. During this report period, we were proncipally involved in four general areas of study: Accelerator-physics research for the Advanced Light Source, the 1-2 GeV synchrotron radiation source now under construction at LBL. In collaboration with the Stanford Linear Accelerator Center, both the conceptual and the detailed design of PEP-II, an energy-asymmetric electron-positron collider, based on the PEP ring at SLAC and designed to serve as a B-meson factory. Studies of ultraviolet and infrared free-electron lasers based on linear accelerators and storage rings, in particular the conceptual design of an infrared free-electron laser for the proposed Chemical Dynamics Research Laboratory at LBL. Generic high-energy accelerator-physics and photon-beam research directed far into the future to envision facilities that would employ new techniques of particle-beam acceleration and storage and photon-beam generation.

Not Available

1992-03-01

470

Exploratory studies, 1991  

SciTech Connect

The Exploratory Studies Group is dedicated to advanced investigation of accelerators and radiation, primarily in the area of charged-particle beams and photon beams. Its primary mission is to explore the next steps in the development of particle accelerators and storage rings, which are important both for high-energy physics and for the wide range of disciplines now turning to synchrotron-radiation sources and free-electron lasers. Our research is therefore deeply committed to LBL`s institutional goal of becoming a center for the generation and use of coherent and incoherent electromagnetic radiation of exceptional brightness, as well as for generic research on the future development of accelerators. A significant fraction of our effort is dedicated to general accelerator-physics research for facilities on the immediate horizon, but a vital part of our activities comprises research into exotic possibilities for charged-particle production, accumulation, acceleration, and storage. During this report period, we were proncipally involved in four general areas of study: Accelerator-physics research for the Advanced Light Source, the 1-2 GeV synchrotron radiation source now under construction at LBL. In collaboration with the Stanford Linear Accelerator Center, both the conceptual and the detailed design of PEP-II, an energy-asymmetric electron-positron collider, based on the PEP ring at SLAC and designed to serve as a B-meson factory. Studies of ultraviolet and infrared free-electron lasers based on linear accelerators and storage rings, in particular the conceptual design of an infrared free-electron laser for the proposed Chemical Dynamics Research Laboratory at LBL. Generic high-energy accelerator-physics and photon-beam research directed far into the future to envision facilities that would employ new techniques of particle-beam acceleration and storage and photon-beam generation.

Not Available

1992-03-01

471

The European Values Study  

NSDL National Science Digital Library

Curious minds want to know: "What exactly do Europeans believe?" It's an important and interesting question, and the directors and researchers in charge of the European Values Study (EVS) have been looking into this subject since the early 1980s. Based in the Netherlands the EVS concerns itself with asking Europeans about religion and morality, politics, work and leisure, and relationships. On their homepage, visitors can learn about their work and view previous and current surveys. While visitors do not have access to the raw data on the site, they can look at the questionnaires and read publications based on this research.

472

Pathology Case Study: Seizures  

NSDL National Science Digital Library

This is a case study presented by the University of Pittsburgh Department of Pathology in which a 24-day-old baby is failing to thrive and experiencing seizures. Visitors are given the microscopic description, with images, the results of the postmortem examination, and are given the opportunity to diagnose the patient. This is an excellent resource for students in the health sciences to familiarize themselves with using patient history and laboratory results to diagnose disease. It is also a helpful site for educators to use to introduce or test student learning in pediatric pathology.

Dickman, Paul S.; Lyons, Valerie

2009-09-16

473

GLAST Mission Concept Study  

NASA Technical Reports Server (NTRS)

Cominsky served as the chair of the GLAST Public Affairs Working Group during the mission concept study. The major accomplishments of this group, which were carried out under her direction include: (1) GLAST Outreach website; (2) Brochure for scientists; (3) Brochure for public; (4) Developed the five key science goal 'bullets' to explain GLAST to the public, as well as the motto used on the GLAST brochures 'Quest for the Ultimate Sources of Energy in the Universe'; (5) Defined the EPO program for GLAST for the proposal phase. Developed initial program outline and budget; and (6) Assisted in the development of the GLAST exhibit, which was used at several scientific conferences.

Cominsky, Lynn R.

2001-01-01

474

My Study Life  

NSDL National Science Digital Library

Some young scholars may ask the question: "What time do I need to be at general chemistry?" or "When does my review group meet?" Keeping track of such matters is a snap with My Study Life, a free online planner. Visitors can color-code each activity for easy visual recognition and insert various tasks that might be due on any given day. Unlike more conventional calendars, this one integrates classes, tasks, and exams to give students and teachers a full picture of what remains to be done. This program is available for Chrome, Windows 8, Windows Phone, and Android, and will soon be available for iOS.

2013-06-19

475

Schistosomiasis: a case study.  

PubMed

Schistosomiasis is a parasitic infection caused by trematodes (flatworms). It is second only to malaria in public health significance, with an estimated 200 million people infected worldwide. Schistosoma haematobium is endemic in Africa and the Middle East. This case study discusses a 36-year-old Somalian male who immigrated to a Northeastern city in the United States from a refugee camp in Kenya. He presented with episodic gross hematuria and flank pain, and was eventually diagnosed with urinary tract schistosomiasis, which was successfully treated with praziquantel. While the disease is not common in the United States, this case is presented for both its urological and cultural considerations. PMID:19331272

Borch, Marianne; Kiernan, Maureen; Rust, Kay; Baron, Barbara; Simmons, Barbara; Hattala, Patricia; Davey, Amy; Yovanovich, Janis; Shayder, Donna; Wasilewski, Amy; LaFaro, Virginia E

2009-01-01

476

Central American resource studies  

SciTech Connect

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 paper presents an overview of this work -- within these proceedings are papers that deal with specific aspects of each topic, and these will be duly noted. 15 refs., 4 figs.

Van Eeckhout, E.; Laughlin, A.W.

1989-01-01

477

Studies in MBO effectiveness.  

PubMed

Management by objectives (MBO) is a popular management approach the efficacy of which has been seriously questioned recently. I have analyzed 185 studies for the effects of MBO on employee productivity and/or job satisfaction. Research support for MBO was found to be inversely related to the degree of research design sophistication. Although the five well-controlled experiments leaned toward finding MBO to be ineffective, it appears a contingency approach to MBO is more appropriate than a definitive affirmation or rejection of MBO effectiveness. PMID:10298234

Kondrasuk, J N

1981-07-01

478

Bibliographies for Chinese Studies  

NSDL National Science Digital Library

Professor Dr. Barend ter Haar, an instructor in the social and economic history of China at the Sinologisches Seminar (Sinological Institute) at Heidelberg University, offers this collection of regularly updated (with one exception) bibliographies on various aspects of Chinese culture and history. Topics include violence in Chinese culture, literacy, writing and education, the study of Yao religion, Shamanism in China, and religious culture in China. Each bibliography varies in length, but most are prefaced by some helpful remarks on the field and/or the secondary literature. Suggestions are welcome.

479

Shuttle communications design study  

NASA Technical Reports Server (NTRS)

The design and development of a space shuttle communication system are discussed. The subjects considered include the following: (1) Ku-band satellite relay to shuttle, (2) phased arrays, (3) PN acquisition, (4) quadriplexing of direct link ranging and telemetry, (5) communications blackout on launch and reentry, (6) acquisition after blackout on reentry, (7) wideband communications interface with the Ku-Band rendezvous radar, (8) aeroflight capabilities of the space shuttle, (9) a triple multiplexing scheme equivalent to interplex, and (10) a study of staggered quadriphase for use on the space shuttle.

Cartier, D. E.

1975-01-01

480

Polymer infiltration studies  

NASA Technical Reports Server (NTRS)

Polymer infiltration investigations were directed toward development of methods by which to produce advanced composite material for automated part fabrication utilizing textile and robotic technology in the manufacture of subsonic and supersonic aircraft. Significant progress was made during the project on the preparation of carbon fiber composites using advanced polymer resins. The findings and results of the project are summarized in the attached paper entitled 'Powder-Coated Towpreg: Avenues to Near Net Shape Fabrication of High Performance Composite.' Also attached to this report is the second of two patent applications submitted as a result of these studies.

Marchello, Joseph M.

1995-01-01

481

Multiwavelength Blazar Studies  

NASA Technical Reports Server (NTRS)

The discovery of a multitude of strongly gamma-ray emitting AGNs by EGRET and the detection of at least two AGNs at even higher energies by the Whipple Collaboration generated much interest in the study of those objects and extensive observations were conducted in the following years. The Michigan group concentrated its effort on continued observations of the two TeV gamma-ray sources, Markarian 421 and Markarian 501, to monitor variability in the high energy emission as well as to provide simultaneous measurements during multiwavelength observations of these objects.

1997-01-01

482

Pathology Case Study: Hyperammonemia  

NSDL National Science Digital Library

This is a case study presented by the University of Pittsburgh Department of Pathology in which a female neonate only two days old became lethargic and developed focal seizures. Visitors are given the high performance liquid chromatography, including images, and are given the opportunity to diagnose the patient. This is an excellent resource for students in the health sciences to familiarize themselves with using patient history and laboratory results to diagnose disease. It is also a helpful site for educators to use to introduce or test student learning in pathology and clinical chemistry.

Diven, Warren; Martens, Jeff; Schubert, Eric

2007-09-06

483

Crew appliance study  

NASA Technical Reports Server (NTRS)

Viable crew appliance concepts were identified by means of a thorough literature search. Studies were made of the food management, personal hygiene, housekeeping, and off-duty habitability functions to determine which concepts best satisfy the Space Shuttle Orbiter and Modular Space Station mission requirements. Models of selected appliance concepts not currently included in the generalized environmental-thermal control and life support systems computer program were developed and validated. Development plans of selected concepts were generated for future reference. A shuttle freezer conceptual design was developed and a test support activity was provided for regenerative environmental control life support subsystems.

Proctor, B. W.; Reysa, R. P.; Russell, D. J.

1975-01-01

484

Studies Relating to EVA  

NASA Technical Reports Server (NTRS)

In this session, Session JA1, the discussion focuses on the following topics: The Staged Decompression to the Hypobaric Atmosphere as a Prophylactic Measure Against Decompression Sickness During Repetitive EVA; A New Preoxygenation Procedure for Extravehicular Activity (EVA); Metabolic Assessments During Extra-Vehicular Activity; Evaluation of Safety of Hypobaric Decompressions and EVA From Positions of Probabilistic Theory; Fatty Acid Composition of Plasma Lipids and Erythrocyte Membranes During Simulation of Extravehicular Activity; Biomedical Studies Relating to Decompression Stress with Simulated EVA, Overview; The Joint Angle and Muscle Signature (JAMS) System - Current Uses and Future Applications; and Experimental Investigation of Cooperative Human-Robotic Roles in an EVA Work Site.

1997-01-01

485

Nondestructive equipment study  

NASA Technical Reports Server (NTRS)

Identification of existing nondestructive Evaluation (NDE) methods that could be used in a low Earth orbit environment; evaluation of each method with respect to the set of criteria called out in the statement of work; selection of the most promising NDE methods for further evaluation; use of selected NDE methods to test samples of pressure vessel materials in a vacuum; pressure testing of a complex monolythic pressure vessel with known flaws using acoustic emissions in a vacuum; and recommendations for further studies based on analysis and testing are covered.

1985-01-01

486

MSFC MXER Tether Study  

NASA Technical Reports Server (NTRS)

This viewgraph presentation provides an overview of the proposed Momentum-eXchange/Electrodynamic Reboost (MXER) space hardware system. The tether system would be position cart-wheeling cables above the Earth and then, rotating like a giant sling, would capture spacecraft or payloads from space shuttles in low Earth orbits and launch them into higher orbits. This study focuses on system validation and structural design issues for MXER. Topics examined include: tether facility design, ED tether system, payload capture/catch mechanism, payload accomodations assembly (PAA), PAA rendezvous capability, and PAA capability to correct tether misthrows.

Polsgrove, Tara; Alexander, Reginald; Bonometti, Joseph; Chapman, Jack; Garza, Lucas; Glaese, John; Glasgow, Shaun; Guendel, Herb; Houston, Vance; Johnson, Paul

2003-01-01

487

NTO decomposition studies  

SciTech Connect

To examine the thermal decomposition of 5-nitro-2,4-dihydro-3H-1,2,4-triazol-3-one (NTO) in detail, isotopic labeling studies were undertaken. NTO samples labeled with {sup 15}N in three different locations [N(1) and N(2), N(4), and N(6)] were prepared. Upon thermolysis, the majority of the NTO condensed-phase product was a brown, insoluble residue, but small quantities of 2,4-dihydro-3H-1,2,4-triazol-3-one (TO) and triazole were detected. Gases comprised the remainder of the NTO decomposition products. The analysis of these gases is reported along with mechanistic implications of these observations.

Oxley, J.C.; Smith, J.L.; Yeager, K.E.; Rogers, E.; Dong, X.X. [Univ. of Rhode Island, West Kingston, RI (United States)

1996-07-01

488

Mobile Bay turbidity study  

NASA Technical Reports Server (NTRS)

The termination of studies carried on for almost three years in the Mobile Bay area and adjacent continental shelf are reported. The initial results concentrating on the shelf and lower bay were presented in the interim report. The continued scope of work was designed to attempt a refinement of the mathematical model, assess the effectiveness of optical measurement of suspended particulate material and disseminate the acquired information. The optical characteristics of particulate solutions are affected by density gradients within the medium, density of the suspended particles, particle size, particle shape, particle quality, albedo, and the angle of refracted light. Several of these are discussed in detail.

Crozier, G. F.; Schroeder, W. W.

1978-01-01

489

Contamination effects study  

NASA Technical Reports Server (NTRS)

The in-situ optical surface measurement system is a facility designed to study the deleterious effects of particulate materials on the surface reflectivities of optical materials in the vacuum ultraviolet (VUV). This arrangement is designed to simulate the on-orbit effects of contamination and degradation of optical surfaces. This simulation is accomplished through the use of non-coherent VUV sources illuminating optical surfaces located in a high vacuum chamber. Several sources of contamination are employed. The reflectivity is measured both at the specular reflection as well as at two scattered positions, forward and reverse. The system components are described and an operating procedure is given.

1988-01-01

490

Dewar technology study  

NASA Technical Reports Server (NTRS)

The development of a Dewar system for handling liquid helium under weightless conditions is described. Porous plug designs for the prevention of superfluid creep out of the dewar through the vent line were evaluated. For the purpose of designing a neck to provide a transition from the cold cavity to the outside, the loads carried by the neck and equipment supports were studied. Temperature, pressure, and mass flow instrumentation for monitoring Dewar performance were also evaluated. In addition, multilayer blankets consisting of aluminized Mylar separated by Dacron net sheets were designed to insulate the pressure vessel. The dewar system is suggested for use with the star tracking telescope aboard the relativity satellite.

Davis, W.

1975-01-01

491

Infrared sky noise study  

NASA Technical Reports Server (NTRS)

The hardware and techniques to measure and compare sky noise at several sites were studied, and a device was developed that would maximize its output and minimize its output for modulation. The instrument and its functions are described. The nature of sky emissions and the fluctuation, gaseous sources of sky noise, and aerosol sources are discussed. It is concluded that sky noise really exists, and the spatial distribution of the sky noise sources are such that observed noise values are linear functions of chopping stroke.

Westphal, J. A.

1972-01-01

492

Geostatistical case studies  

SciTech Connect

The objective of this volume of contributed chapters is to present a series of applications of geostatistics. These range from a careful variographic analysis on uranium data, through detailed studies on geologically complex deposits, right up to the latest nonlinear methods applied to deposits with highly skewed data contributions. Applications of new techniques such as the external drift method for combining well data with seismic information have also been included. The volume emphasizes geostatistics in practice. Notation has been kept to a minimum and mathematical details have been relegated to annexes.

Matheron, G.; Armstrong, M.

1987-01-01

493

Pathology Case Study: Petechiae  

NSDL National Science Digital Library

This is a case study presented by the University of Pittsburgh Department of Pathology in which a 6-hour-old baby was found to have petechiae. Visitors are given the case description and the opportunity to diagnose the patient. This is an excellent resource for students in the health sciences to familiarize themselves with using patient history and laboratory results to diagnose disease. It is also a helpful site for educators to use to introduce or test student learning in pathology and transfusion medicine.

Lopez-Plaza, Iliana; Nester, Theresa; Qu, Lirong

2008-03-26

494

Pathology Case Study: Peritonitis  

NSDL National Science Digital Library

This is a case study presented by the University of Pittsburgh Department of Pathology in which a 26-year-old woman has had a 13-year history of poorly controlled insulin-dependent diabetes mellitus. Visitors are given both the patient history and laboratory results, including images, and are given the opportunity to diagnose the patient. This is an excellent resource for students in the health sciences to familiarize themselves with using patient history and laboratory results to diagnose disease. It is also a helpful site for educators to use to introduce or test student learning in pathology and clinical microbiology.

Anhalt, John P.; Macauley, Robert; Pasculle, A. W.; Sheaffer, John; Torbenson, Michael

2007-10-05

495

Pathology Case Study: Seizures  

NSDL National Science Digital Library

This is a case study presented by the University of Pittsburgh Department of Pathology in which a 7-year-old girl is experiencing episodic seizures. Visitors are given both the microscopic and gross descriptions, including neuroimaging results, and are given the opportunity to diagnose the patient. This is an excellent resource for students in the health sciences to familiarize themselves with using patient history and laboratory results to diagnose disease. It is also a helpful site for educators to use to introduce or test student learning in neuropathology. [ASC

Al-Hindi, Hindi; Subach, Brian R.

2007-10-15

496

Pathology Case Study: Seizures  

NSDL National Science Digital Library

This is a case study presented by the University of Pittsburgh Department of Pathology of a 51 year-old man with epilepsy. Images and results from a neurological examination are provided in this case. The patientâÂÂs diagnosis is found in the âÂÂFinal Diagnosisâ section, which also includes a detailed description of the condition from the contributing doctors. This is an excellent resource for students in the health sciences to familiarize themselves with using patient history and laboratory results to diagnose patientâÂÂs conditions. It is also a helpful site for educators to use to introduce or test student knowledge of neuropathology.

2008-04-08

497

Rotorcraft contingency power study  

NASA Technical Reports Server (NTRS)

Twin helicopter engines are often sized by the power requirement of a safe mission completion after the failure of one of the two engines. This study was undertaken for NASA Lewis by General Electric Co. to evaluate the merits of special design features to provide a 2-1/2 Contingency Power rating, permitting an engine size reduction. The merits of water injection, turbine cooling airflow modulation, throttle push, and a propellant auxiliary power plant were evaluated using military Life Cycle Cost (LCC) and commercial helicopter Direct Operating Cost (DOC) merit factors in a rubber engine and a rubber aircraft scenario.

Hirschkron, R.; Haynes, J. F.; Goldstein, D. N.; Davis, R. H.

1984-01-01

498

Pathology Case Study: Hemoptysis  

NSDL National Science Digital Library

This is a pulmonary pathology case study presented by the University of Pittsburgh Department of Pathology in which a 55 year old female has spontaneously occurring hemoptysis. Visitors are given both the microscopic and gross descriptions, radiology, including images, and are given the opportunity to diagnose the patient. This is an excellent resource for students in the health sciences to familiarize themselves with using patient history and laboratory results to diagnose. It is also a helpful site for educators to use to introduce or test student learning in pulmonary pathology.

Holst, Valerie; Yousem, Sam

2007-08-28

499

Pathology Case Study: Peritonitis  

NSDL National Science Digital Library

This is a case study presented by the University of Pittsburgh Department of Pathology in which a 70-year-old man has peritonitis. Visitors are given both the microscopic and gross descriptions, including images, and are given the opportunity to diagnose the patient. This is an excellent resource for students in the health sciences to familiarize themselves with using patient history and laboratory results to diagnose disease. It is also a helpful site for educators to use to introduce or test student learning in gastrointestinal pathology.

Nine, Jeff S.

2007-12-12

500

Pathology Case Study: Headache  

NSDL National Science Digital Library

The Department of Pathology at the University of Pittsburgh Medical Center has compiled a wide range of pathology case studies to aid students and instructors in the medical/health science field. In this case, a 79 year old male with headaches and sinus problems is evaluated. The patient previously had "an inverted papilloma resected." Using the gross description, microscopic description, and images provided, students are encouraged to test their knowledge of pathology and diagnose the patient's medical problem. This is an excellent resource for providing students experience with patient history, lab results and diagnostics.

Nine, Jeff S.

2007-11-28