Sample records for nuclear-quadruple-resonance nqr study

  1. Temperature and baric dependence of nuclear quadruple resonance spectra in indium and gallium monoselenides

    NASA Astrophysics Data System (ADS)

    Khandozhko, Victor; Raranskii, Nikolai; Balazjuk, Vitaly; Samila, Andriy; Kovalyuk, Zahar

    2013-12-01

    Pulsed radiospectroscopy method has been used to study nuclear quadruple resonance (NQR) spectra of 69Ga and 115In isotopes in the layered semiconductors GaSe and InSe. It has been found that in GaSe and InSe there is a considerable temperature dependence of NQR frequency which in the temperature range of 250 to 390 K is practically linear with conversion slope 1.54 kHz/degree for 69Ga and 2.35 kHz/degree for 115In. In the same crystals the effect of uniaxial pressure on NQR spectra applied along the optical axis ? up to the values of 500 kg/?m2 has been studied. A strong attenuation of NQR spectra intensity with increase in pressure on layered crystal package has been established. The unvaried multiplicity of resonance spectra indicates the absence of structural transformations in these layered crystals over the investigated range of temperatures and pressures.

  2. NMR and NQR study of the thermodynamically stable quasicrystals

    SciTech Connect

    Shastri, A.

    1995-02-10

    {sup 27}Al and {sup 61,65}Cu NMR measurements are reported for powder samples of stable AlCuFe and AlCuRu icosahedral quasicrystals and their crystalline approximants, and for a AlPdMn single grain quasicrystal. Furthermore, {sup 27}Al NQR spectra at 4.2 K have been observed in the AlCuFe and AlCuRu samples. From the quadrupole perturbed NMR spectra at different magnetic fields, and from the zero field NQR spectra, a wide distribution of local electric field gradient (EFG) tensor components and principal axis system orientations was found at the Al site. A model EFG calculation based on a 1/1 AlCuFe approximant was successful in explaining the observed NQR spectra. It is concluded that the average local gradient is largely determined by the p-electron wave function at the Al site, while the width of the distribution is due to the lattice contribution to the EFG. Comparison of {sup 63}Cu NMR with {sup 27}Al NMR shows that the EFG distribution at the two sites is similar, but that the electronic contribution to the EFG is considerably smaller at the Cu site, in agreement with a more s-type wave function of the conduction electrons.

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

    SciTech Connect

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

    1993-07-01

    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.

  4. 93Nb- and 27Al-NMR/NQR studies of the praseodymium based PrNb2Al20

    NASA Astrophysics Data System (ADS)

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

    2015-03-01

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

  5. Co-NQR Study on Successive Magnetic Phase under Pressure in Non-centrosymmetric CeCoGe3

    NASA Astrophysics Data System (ADS)

    Inagaki, T.; Matsumura, M.; Mizoo, M.; Kawamura, Y.; Kato, H.; Nishioka, T.

    2012-12-01

    We have performed Co-NQR study to clarify the complex magnetic phases in approaching to the quantum critical point (QCP). The successive transitions at TN2=12 K and TN3=8 K after the ferrimagnetic-like order at TN1=21 K in ambient pressure are confirmed by the spectral changes of Co-NQR However no critical slowing down of the nuclear spin-lattice relaxation rate 1/T1 or the nuclear spin-spin relaxation rate 1/T2 at TN2 and TN3 was observed, suggesting 1st order transitions. In applying pressure, a large spectral change of Co-NQR occurs in relatively low pressure of 0.3 Gpa. The Co-NQR spectrum becomes simple above about 0.7 GPa, consisting of the two Co sites with spectral weight ratio of 2. No successive transitions were observed in 1.5 GPa, indicating that the successive transitions are confined to relatively low pressure region. The extremely slower decrease of the sublattice magnetization than that expected in the mean field approximation is seen in 1.5 GPa.

  6. Chemical phase separation in carbon doped YBa 2Cu 3O 6+ x: a 63,65Cu NQR study

    NASA Astrophysics Data System (ADS)

    Grévin, B.; Berthier, Y.; Monot, I.; Wang, J.; Weiss, F.

    1997-02-01

    We report on 63,65Cu NQR spectra and nuclear spin-lattice relaxation rate (1/ T1) measurements at 4.2 K in YBa 2Cu 3O 6+ x powder samples with carbon concentrations ranging from 500 to 3000 ppm. A new NQR line appears at 30.90 MHz ( 63Cu line), the intensity of which is strongly correlated with the amount of carbon in the sample. The measurement of the spin-lattice relaxation rate for Cu corresponding to the different lines measured shows different relaxation behaviors. Furthermore a drastic change is observed for T1 between the two samples. We discuss the implications of these findings in the framework of chemical phase separation and compare to previous carbon retention studies in YBa 2Cu 3O 6+ x by other techniques.

  7. NQR study of local structures and cooling rate dependent superconductivity in La sub 2 CuO sub 4+. delta

    SciTech Connect

    Reyes, A.P.; Ahrens, E.T.; Hammel, P.C.; Heffner, R.H.; Thompson, J.D.; Canfield, P.C.; Fisk, Z. (Los Alamos National Lab., NM (United States)); Schirber, J.E. (Sandia National Labs., Albuquerque, NM (United States))

    1992-01-01

    Structural properties of oxygen-annealed polycrystals of La{sub 2}CuO{sub 4 + {delta}} ({delta}{approximately}0.03) have been studied using {sup 139}La NQR spectroscopy. Superconducting critical temperatures were found to depend on the rate of cooling through a narrow temperature range at about 195K. Preliminary analysis of the {sup 139}La NQR spectra suggest that the oxygen-rich phase-separated region is composed of two structurally distinct phases, both of which are metallic and super-conducting. One phase has a structure closely related to the stoichiometric oxygen-poor compound. The second shows a considerable amount of apical oxygen disorder, a large shift in NQR frequency {nu}{sub Q}, and a volume fraction which increases with cooling rate. The formation of the second phase below {minus}200K is indicative of the freezing Of CuO{sub 6} octahedral tilting. Abrupt shifts in {nu}{sub Q} above {Tc} were also observed for both phases, suggestive of a local structural anomaly or charge transfer to the Cu-O plane.

  8. 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)

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

    2009-07-01

    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.

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

    NASA Astrophysics Data System (ADS)

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

    2006-11-01

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

  10. Successive Phase Transitions and High Ionic Conductivity of Trichlorogermanate (II) Salts as Studied by 35C1 NQR and Powder X-Ray Diffraction

    NASA Astrophysics Data System (ADS)

    Yamada, K.; Isobe, K.; Okuda, T.; Furukawa, Y.

    1994-02-01

    A series of trichlorogermanate(II) salts (AGeCl3, A = Rb, Cs, CH3N H3, and (CH3)4N) have been synthesized and characterized by 35Cl NQR , 35Cl NMR , AC conductivity, DTA, and X-ray diffraction techniques. In the temperature range studied two, two, five, and four phases were confirmed for the Rb, Cs, CH3NH3, and (CH3)4N salts, respectively. From the 35Cl NQR and structural data, isolated pyramidal GeCl3 anions were recognized in the low temperature phases. With increasing temperature the relaxation times of the 35Cl NQR decreased exponentially and the signals disappeared far below the melting point. This suggests that the reorientation of the anion about the pseudo three-fold axis is excited. With further increase in temperature, the ionic conductivity of CH3NH3GeCl3 and (CH3)4NGeCl3 increased drastically at the phase transitions to their cubic perovskite phases (CH3NH3GeCl3:?= 10-1 Sm-1 at 400 K, (CH3)4NGeCl3: ? = 5 x 10-2 Sm-1 at 420 K). The mobile ion was confirmed to be the chloride ion by means of 35Cl NMR and X-ray diffraction.

  11. 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)

    Cheng, Show-Jye

    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.

  12. Electronic structure and biological activity of chosen DDT-type insecticides studied by 35Cl-NQR.

    PubMed

    Jadzyn, Maciej; Nogaj, Boles?aw

    2009-02-01

    A correlation between the electronic structure and biological activity of chosen dichlorodiphenyltrichloroethane (DDT)-type insecticides: 1,1,1-trichloro-2,2-bis(4-chlorophenyl)ethane, 1,1-dichloro-2,2-bis(4-chlorophenyl)ethane, 2,2-bis(p-chlorophenyl)-1,1-dichloroethylene, 2,2-bis(4-chlorophenyl)ethanoic acid and 4,4'-dichlorobenzophenone (used in agriculture) has been analysed on the basis of the (35)Cl-nuclear quadrupole resonance (NQR) spectroscopy. The (35)Cl-NQR resonance frequencies measured at 77 K have been correlated with the lethal dose (LD(50)) parameter that characterises the biological activity of these insecticides. PMID:18942076

  13. Chlorine NQR on Derivatives of Chloral

    NASA Astrophysics Data System (ADS)

    Hashimoto, Masao; Weiden, Norbert; Weiss, Alarich

    1980-10-01

    The 35Cl-NQR spectrum of several derivatives of chloral, Cl3CCHO, was studied in the ranee 77 K ? T ? Tm. By use of the spin echo double resonance technique a relative assignment of the resonances to different Cl3C-groups within one crystallized compound was possible. The solid compounds studied are: High temperature phase of chloral hydrate, Cl3CCH(OH)2; parachloral, (Cl3CCHO)3, (?-and ß-isomer); the two phases of chloral hemihydrate Cl3CCHO · 1/2 H2O; chloralide (II); chloralhemithiohydrate, Cl3CCHO · 1/2 H2S. The structure of the molecules in the solid state and the fade out of the NQR resonances are discussed.

  14. NQR 127I Spectroscopy of Layered Inorganic Compounds Intercalated with Aromatic Amines

    NASA Astrophysics Data System (ADS)

    Babushkina, T. A.; Seryukova, I. V.

    1998-07-01

    NQR spectroscopy was used to study the intercalating influence on the iodine electric field gradient of lead(ll) and cadmium(ll) iodides. We used pyridine, piperidine, aniline and quinoline, as guest substances. In the intercalates the NQR frequencies and their dependence on temperature in different crystalline phases were studied. The peculiarities of chemical bonds and crystal structures were discussed.

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

    SciTech Connect

    Not Available

    1991-12-17

    Our previous studies (1,2) on the zerofield NMR spectra of Cu/Co catalysts revealed that the method of preparation sensitively influences the magnetic character of the Catalyst. Catalytic studies of the earlier investigators also (3) show similar influence on the product selectivity and indicate reproducible performance is critically dependent on the control and rigor of the preparation technique. To compliment the NMR results, we have made a thorough investigation of the Hysteresis character of the Cu/Co catalysts with the metal ratio varying from 0.2 to 4.0.

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

    SciTech Connect

    Not Available

    1991-12-17

    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.

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

    SciTech Connect

    Not Available

    1991-07-15

    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.

  18. NQR study of ternary chalcogenides A3BX3, ABX2, and ABX where A = Cu, Ag, or TI, B = As or Sb, and X = S or Se

    Microsoft Academic Search

    T. J. Bastow; H. J. Whitfield

    1981-01-01

    121Sb, 123Sb, 75As, 63Cu, and 65Cu NQR resonances are reported for CuSbSe2, Tl3SbSe3, Tl3SbS3, Tl3AsS3, Tl3AsSe3, Ag3AsSe3, TlSbS2, CuAsS, AgAsS, and Cu5SbS3I2. Tl3SbSe3 is an incongruently melting compound not observed in an earlier phase-diagram study of the pseudobinary system Tl2Se-Sb2Se3. For isostructural arsenic and antimony chalcogenides the ratio of 75As to 121Sb quadrupole coupling constants is 0.42, and for the

  19. Sodium and potassium salts of dichloroisocyanuric acid and their hydrates as antimicrobials agents studied by 35Cl-NQR spectroscopy and DFT calculations

    Microsoft Academic Search

    A. Walczak; B. Brycki; M. Kaczmarek; O. Kh. Poleshchuk; M. Ostafin; B. Nogaj

    2006-01-01

    The electronic structure of dichloroisocyanuric acid derivatives was analysed by 35Cl-NQR spectroscopy and DFT calculations. Here we concentrate our attention on three different factors: type of metallic substituent (sodium and potassium), temperature of the sample (liquid nitrogen and room) and degree of hydration (an amount of water molecules attached to analysed compounds). In particular, all the variations in 35Cl-NQR frequencies

  20. Quadrupole Coupling Parameters and Structural Aspects of Crystalline and Amorphous Solids by NMR and Nqr.

    NASA Astrophysics Data System (ADS)

    Mao, Degen

    Nuclear quadrupole interaction is very sensitive to the local electron distribution and chemical bondings. NMR and NQR techniques have been 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. ^{71}Ga and ^{69}Ga NMR has been used to study crystalline beta-Ga _2O_3 and several gallate glasses. Quadrupole parameters were acquired for GaO_6 and GaO_4 units in beta-Ga_2 O_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. ^{51}V (I = 7/2) NQR resonances below 850 kHz have been detected for several metavanadates at both room temperature and liquid nitrogen temperature. Quadrupole parameters thus obtained are an order of magnitude more accurate than values obtained by previous NMR studies. For a spin 3/2 nucleus, the pure NQR frequency {Q_{cc}over 2}sqrt{1+{eta^2over 3}}is insufficient to determine either Q_{cc} or eta. However, two methods, Zeeman perturbed NQR powder pattern and ^{10}B NQR, can be employed to obtain both Q_{cc } and eta. An example is given for ^{11}B in CaO-B_2O_3. With a double coil tank circuit design, pure ^ {11}B NQR was used to determine the fraction of borons in BO_3 and BO _4 configurations in hydrated zinc borates. ^{11}B NMR and NQR were also used to study lead borate glasses. Small changes in Q_{cc} (less than 2%) and eta (less than 0.1) suggest that BO_3 units with non-bridging oxygens are not present in the lead borate glasses.

  1. Explosives detection by nuclear quadrupole resonance (NQR)

    NASA Astrophysics Data System (ADS)

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

    1994-10-01

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

  2. The incommensurate phase of 4,4'-dichlorobiphenyl sulphone reinvestigated by 35Cl NQR

    Microsoft Academic Search

    J. Schneider; A. Wolfenson; A. Brunetti

    1994-01-01

    In order to acquire new information about the normal-incommensurate (IC) phase transition and to check the existence of a lock-in transition in 4,4'-dichlorobiphenyl sulphone (4,4'-DCBS), a comprehensive 35Cl nuclear quadrupole resonance (NQR) study is reported. Detailed NQR measurements of frequency, line width and spin relaxation time (Tl) were obtained in the temperature range 80-270 K. The results show that the

  3. Zero-field NMR and NQR spectrometer

    SciTech Connect

    Bielecki, A.; Zax, D.B.; Zilm, K.W.; Pines, A.

    1986-03-01

    In comparison to high-field NMR, zero-field techniques offer advantages in terms of spectral interpretability in studies of polycrystalline or amorphous solids. This article describes a technique and apparatus for time-domain measurements of nuclear magnetism in the absence of applied fields (Fourier transform zero-field NMR and NQR). Magnetic field cycling and high field detection are employed to enhance sensitivity. The field cycling is accomplished with an air-driven shuttle system which moves the sample between regions of high and low magnetic field, in combination with switchable electromagnets in the low-field region. Sudden field steps or pulses are used to initiate coherent nuclear spin evolution in zero field and to monitor such evolution as a function of time. Experimental results are shown and analyzed. Possible variations on the basic method are described and their relative advantages are discussed.

  4. 14N NQR in the tetrazole family

    NASA Astrophysics Data System (ADS)

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

    2009-10-01

    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.

  5. NQR: a non-destructive method for studying oxygen content and defects in YBa 2Cu 3O 6+x superconducting thin films

    NASA Astrophysics Data System (ADS)

    Grévin, B.; Berthier, Y.; Pourtier, F.; Villégier, J. C.; Schmatz, U.

    1997-02-01

    NQR spectra of 63,65Cu isotopes were measured in YBa 2Cu 3O 6+x thin films at 1.4 K, which were prepared by cathodic sputtering and chemical vapor deposition. By comparison with powder spectra, we show that the films obtained by cathodic sputtering are overdoped. We discuss the possible reasons of the lower Tc commonly obtained in YBa 2Cu 3O 6+x thin films by comparison with powders and single crystals. Furthermore, we show that thin films synthesized by chemical vapor deposition could be affected by carbon retention.

  6. NMR and NQR study of the electronic and structural properties of Al-Cu-Fe and Al-Cu-Ru quasicrystals

    SciTech Connect

    Shastri, A.; Borsa, F.; Torgeson, D.R.; Shield, J.E.; Goldman, A.I. (Ames Laboratory, U.S. Department of Energy and Department of Physics Astronomy, Iowa State University, Ames, Iowa 50011 (United States))

    1994-12-01

    [sup 27]Al and [sup 63,65]Cu NMR is reported for powdered stable Al-Cu-Fe and Al-Cu-Ru icosahedral quasicrystals and crystalline approximants, and for an Al-Pd-Mn single-grain quasicrystal. [sup 27]Al NQR spectra at 4.2 K were observed in Al-Cu-Fe and Al-Cu-Ru samples. From quadrupole-perturbed NMR spectra at different magnetic fields, and from zero-field NQR spectra, a wide distribution of local electric-field gradient (EFG) tensor components and principal-axis-system orientations was found at the Al site. A model EFG calculation based on a 1/1 Al-Cu-Fe approximant successfully explained the observed NQR spectra. The average local gradient is largely determined by the [ital p]-electron wave function at the Al site, while the width of the distribution is due to EFG lattice contribution. Comparison of [sup 63]Cu and [sup 27]Al NMR shows the EFG distribution at the two sites is similar, but the electronic contribution to the EFG is considerably smaller at the Cu site, in agreement with a more [ital s]-type wave function of the conduction electrons. Overall spread of EFG values is well reproduced by calculation based on the approximant. However, the experimental spectra indicate a much larger number of nonequivalent sites when compared with the simulated NQR spectra based on the 1/1 approximant. The short-range, local chemical order is well represented by the approximant, but differences in coordination must be included at intermediate range in the quasicrystal. Measured [sup 27]Al Knight shift, magnetic susceptibility, and nuclear spin-lattice relaxation time as a function of temperature indicate reduced density of states at the Fermi level by a factor of 7 or 8 from the value in Al metal, consistent with the notion of a pseudogap for these quasicrystals. No differences in measured parameters were detected as a function of composition of the quasicrystalline alloys.

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

    NASA Astrophysics Data System (ADS)

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

    2014-10-01

    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.

  8. 14 N NQR spectrum of sildenafil citrate

    NASA Astrophysics Data System (ADS)

    Stephenson, David; Singh, Nadia

    2015-04-01

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

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

    PubMed Central

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

    2014-01-01

    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

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

    PubMed

    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

    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

  11. Crystallization and preliminary analysis of the NqrA and NqrC subunits of the Na+-translocating NADH:ubiquinone oxidoreductase from Vibrio cholerae.

    PubMed

    Vohl, Georg; Nedielkov, Ruslan; Claussen, Björn; Casutt, Marco S; Vorburger, Thomas; Diederichs, Kay; Möller, Heiko M; Steuber, Julia; Fritz, Günter

    2014-07-01

    The Na+-translocating NADH:ubiquinone oxidoreductase (Na+-NQR) from Vibrio cholerae is a membrane protein complex consisting of six different subunits NqrA-NqrF. The major domains of the NqrA and NqrC subunits were heterologously expressed in Escherichia coli and crystallized. The structure of NqrA1-377 was solved in space groups C222? and P2? by SAD phasing and molecular replacement at 1.9 and 2.1?Å resolution, respectively. NqrC devoid of the transmembrane helix was co-expressed with ApbE to insert the flavin mononucleotide group covalently attached to Thr225. The structure was determined by molecular replacement using apo-NqrC of Parabacteroides distasonis as search model at 1.8?Å resolution. PMID:25005105

  12. Absence of Magnetic Dipolar Phase Transition and Evolution of Low-Energy Excitations in PrNb2Al20 with Crystal Electric Field ?3 Ground State: Evidence from 93Nb-NQR Studies

    NASA Astrophysics Data System (ADS)

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

    2015-07-01

    We report measurements of bulk magnetic susceptibility and 93Nb nuclear quadrupole resonance (NQR) in the Pr-based caged compound PrNb2Al20. By analyzing the magnetic susceptibility and magnetization, the crystal electric field (CEF) level scheme of PrNb2Al20 is determined to be ?3(0 K)-?4(21.32 K)-?5(43.98 K)-?1(51.16 K) within the framework of the localized 4f electron picture. The 93Nb-NQR spectra exhibit neither spectral broadening nor spectral shift upon cooling down to 75 mK. The 93Nb-NQR spin-lattice relaxation rate 1/T1 at 5 K depends on the frequency and remains almost constant below 5 K. The frequency dependence of 1/T1 is attributed to the magnetic fluctuation due to the hyperfine-enhanced 141Pr nuclear moment inherent in the nonmagnetic ?3 CEF ground state. The present NQR results provide evidence that no symmetry-breaking magnetic dipole order occurs down to 75 mK. Also, considering an invariant form of the quadrupole and octupole couplings between a 93Nb nucleus and Pr 4f electrons, Pr 4f quadrupoles and an octupole can couple with a 93Nb nuclear quadrupole moment and nuclear spin, respectively. Together with the results of bulk measurements, the present NQR results suggest that the possibility of a static quadrupole or octupole ordering can be excluded down to 100 mK. At low temperatures below 500 mK, however, the nuclear spin-echo decay rate gradually increases and the decay curve changes from Gaussian decay to Lorentzian decay, suggesting the evolution of a low-energy excitation.

  13. Fourier transform zero field NMR and NQR

    SciTech Connect

    Zax, D.B.

    1984-09-01

    The characterization of the structural and chemical properties of matter, particularly in disordered condensed phases, is a difficult process. Few analytical methods work effectively on polycrystalline or amorphous solids. In many systems the chemical shifts measured by traditional high resolution solid state NMR methods are insufficiently sensitive or the information contained in the dipole-dipole couplings is more important. In these cases Fourier transform zero field magnetic resonance may make an important contribution. Zero field NMR and NQR is the subjecti of this thesis.

  14. Fourier transform zero field NMR and NQR

    SciTech Connect

    Zax, D.B.

    1985-01-01

    In many systems the chemical shifts measured by traditional high resolution solid state NMR methods are insufficiently sensitive, or the information contained in the dipole-dipole couplings is more important. In these cases, Fourier transform zero field magnetic resonance may make an important contribution. Zero field NMR and NQR is the subject of this thesis. Chapter I presents the quantum mechanical background and notational formalism for what follows. Chapter II gives a brief review of high resolution magnetic resonance methods, with particular emphasis on techniques applicable to dipole-dipole and quadrupolar couplings. Level crossings between spin-1/2 and quadrupolar spins during demagnetization transfer polarization from high to low lambda nuclei. This is the basis of very high sensitivity zero field NQR measurements by field cycling. Chapter III provides a formal presentation of the high resolution Fourier transform zero field NMR method. Theoretical signal functions are calculated for common spin systems, and examples of typical spectra are presented. Chapters IV and V review the experimental progress in zero field NMR of dipole-dipole coupled spin-1/2 nuclei and for quadrupolar spin systems. Variations of the simple experiment describe in earlier chapters that use pulsed dc fields are presented in Chapter VI.

  15. 35Cl NQR Spectra of several 2,2-bis- p-chlorophenyl chloroethane derivatives

    NASA Astrophysics Data System (ADS)

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

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

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

    NASA Astrophysics Data System (ADS)

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

    2006-05-01

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

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

    PubMed

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

    2015-01-20

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

  18. NQR: From imaging to explosives and drugs detection

    NASA Astrophysics Data System (ADS)

    Osán, Tristán M.; Cerioni, Lucas M. C.; Forguez, José; Ollé, Juan M.; Pusiol, Daniel J.

    2007-02-01

    The main aim of this work is to present an overview of the nuclear quadrupole resonance (NQR) spectroscopy capabilities for solid state imaging and detection of illegal substances, such as explosives and drugs. We briefly discuss the evolution of different NQR imaging techniques, in particular those involving spatial encoding which permit conservation of spectroscopic information. It has been shown that plastic explosives and other forbidden substances cannot be easily detected by means of conventional inspection techniques, such as those based on conventional X-ray technology. For this kind of applications, the experimental results show that the information inferred from NQR spectroscopy provides excellent means to perform volumetric and surface detection of dangerous explosive and drug compounds.

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

    SciTech Connect

    Not Available

    1991-12-17

    Our previous studies (1,2) on the zerofield NMR spectra of Cu/Co catalysts revealed that the method of preparation sensitively influences the magnetic character of the Catalyst. Catalytic studies of the earlier investigators also (3) show similar influence on the product selectivity and indicate reproducible performance is critically dependent on the control and rigor of the preparation technique. To compliment the NMR results, we have made a thorough investigation of the Hysteresis character of the Cu/Co catalysts with the metal ratio varying from 0.2 to 4.0.

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

    SciTech Connect

    Not Available

    1991-12-17

    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.

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

    SciTech Connect

    Not Available

    1991-07-15

    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.

  2. 35Cl NQR of 1,5,2-Diazaphosphorine Derivatives

    NASA Astrophysics Data System (ADS)

    Dolgushin, G. V.; Nikitin, P. A.; Sapozhnikov, Yu. E.; Dmitrichenko, M. Yu.; Rozinov, V. G.; Voronkov, M. G.

    1994-02-01

    NQR frequencies and asymmetry parameters (?) of 35Cl chlorine-containing 1,5,2-diazaphosphorine derivatives are reported and discussed. NMDO calculations with total optimization of geometry have been carried out. The ?cal and ?cal values, calculated by means of the Townes and Dailey theory, correlate well with the experimenal data.

  3. NMR-NQR study of the crossover from the spin-glass to the superconducting phase in La{sub 2{minus}x}Sr{sub x}CuO{sub 4}

    SciTech Connect

    Julien, M.H.; Carretta, P.; Borsa, F.; Rigamonti, A. [Unita INFM di Pavia (Italy). Dipt. di Fisica] [Unita INFM di Pavia (Italy). Dipt. di Fisica

    1999-04-20

    {sup 139}La and {sup 63}Cu NQR relaxation rates are used to obtain insights on the effects of itinerant holes on the magnetic in-plane correlation length, for x {le} 0.04 in La{sub 2{minus}x}Sr{sub x}CuO{sub 4}. For these concentrations, corresponding to spin-glass behavior at low temperature, evidence for the microsegregation of holes along stripes is presented. Preliminary relaxation results for an amount of Sr doping leading to superconductivity are also presented and discussed in terms of the crossover from the spin-glass to the underdoped superconducting regime: for x = 0.06 a slowing down of spin fluctuations is evidenced and superconductivity is found to coexist with spin-freezing.

  4. ¹?N nuclear quadrupole resonance study of polymorphism in famotidine.

    PubMed

    Lu?nik, Janko; Pirnat, Janez; Jazbinšek, Vojko; Lavri?, Zoran; Žagar, Veselko; Sr?i?, Stane; Seliger, Janez; Trontelj, Zvonko

    2014-09-01

    (14)N nuclear quadrupole resonance (NQR) in two known polymorphs of famotidine was measured. At room temperature, seven quadrupolar sets of transition frequencies (?(+), ?(-), and ?(0)) corresponding to seven different nitrogen sites in the crystal structure of each of the two polymorphs were found. This confirms the expected ability of NQR to distinguish polymorph B from its analog A. NQR can also measure their ratio in a solid mixture and in the final dosage form, that is, a tablet. The NQR frequencies, line shapes, and tentative assignation to all seven molecular (14)N atoms were obtained. Unravelment of these two entangled NQR spectra presents a valuable contribution to the NQR database and enables studies of some possible correlations therein. Moreover, nondestructive (14)N NQR studies of commercial famotidine tablets can reveal some details of the drug fabrication process connected with compression. PMID:24668530

  5. A general numerical analysis of time-domain NQR experiments

    Microsoft Academic Search

    Elad Harel; Herman M. Cho

    2006-01-01

    We introduce a general numerical approach for solving the Liouville equation of an isolated quadrupolar nuclide that can be used to analyze the unitary dynamics of time-domain NQR experiments. A numerical treatment is necessitated by the dimensionality of the Liouville space, which precludes analytical, closed form solutions for I>3\\/2. Accurate simulations of experimental nutation curves, forbidden transition intensities, powder and

  6. NQR and ? SR in Diluted Two-Dimensional S=1/2 Heisenberg Antiferromagnets

    NASA Astrophysics Data System (ADS)

    Carretta, P.; Rigamonti, A.; Todeschini, E.; Malavasi, L.

    2003-02-01

    139La NQR spectra and relaxation and ? SR precessional frequencies in La2Cu1-xMxO4 (for M = Zn and Mg) are reported in order to study the effect of spin dilution in the planar quantum Heisenberg antiferromagnet (2DQHAF) La2CuO4. The behavior of the spin stiffness ? s(x) and of the in-plane correlation length ? 2D(x,T), of the sublattice magnetization and of the Néel temperature, for a dilution approaching the percolation threshold depart sizeably from the ones expected in dilution-like models. In spite of the marked reduction of ? s the transition to the ordered state occurs at a temperature, where ? 2D(x,TN) reaches a value close to the one in undoped 2DQHAF.

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

    SciTech Connect

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

    2012-04-12

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

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

    NASA Astrophysics Data System (ADS)

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

    2010-04-01

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

  9. A General Numerical Analysis of Time-Domain NQR Experiments

    SciTech Connect

    Harel, Elad; Cho, Herman M.

    2006-12-01

    We introduce a general numerical approach for solving the Liouville equation of a quadrupolar nuclide that we show can be used to analyze time-domain NQR experiments. A computer-based treatment is necessitated by the dimensionality of the Liouville space, which precludes analytical, closed form solutions for I > 3/2. Accurate simulations of experimental nutation curves, forbidden transition intensities, powder and single crystal spectra, and off-resonance irradiation dynamics can be computed with this method. We also examine the validity of perturbative approximations where the signal intensity of a transition is proportional to the transition moment between the eigenstates of the system, thus providing a simple basis for determining selection rules. Our method allows us to calculate spectra for all values of the asymmetry parameter, ?, and sample orientations relative to the coil axis. We conclude by demonstrating the methodology for calculating the response of the quadrupole system to amplitude- and frequency-modulated pulses.

  10. NMR and NQR parameters of ethanol crystal

    E-print Network

    Milinkovic, M

    2012-01-01

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

  11. NMR and NQR investigations of local symmetry in the hidden order phase of URu2Si2

    NASA Astrophysics Data System (ADS)

    Mito, T.; Hattori, M.; Motoyama, G.; Sakai, Y.; Koyama, T.; Ueda, K.; Kohara, T.; Yokoyama, M.; Amitsuka, H.

    2012-12-01

    In order to study local symmetries at the 4e(Si)- and 4d(Ru)-sites above and below hidden order transition temperature TO = 17.5 K in URu2Si2, we have investigated the nuclear quadrupole interaction by 73Ge-nuclear magnetic resonance (NMR) measurement on a 10% 73Ge-substituted sample URu2(Si0.9Ge0.1)2, and by 101Ru-nuclear quadrupole resonance (NQR) measurement on a pure single crystal sample. The present 73Ge-NMR measurements do not give any evidence for change in the local symmetry at 4e-site within experimental accuracy. On the other hand, the precise measurement of 101Ru-NQR frequency has detected an anomaly just below TO as sensitively as the thermal expansion measurement dose. Its temperature dependence shows a linear relation with that of the in-plane lattice parameter, which may be a clue to clarify a modification in microscopic charge distribution at TO.

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

    PubMed Central

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

    2010-01-01

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

  13. Zero field NMR and NQR with selective pulses and indirect detection

    SciTech Connect

    Millar, J.M.; Thayer, A.M.; Bielecki, A.; Zax, D.B.; Pines, A.

    1985-08-01

    Zero field NMR and NQR spectra are obtained by the application of dc magnetic field pulses to a demagnetized sample. Pulsed dc fields allow for selective excitation of isotopic species and provide a means for coherent manipulation of the spin system in zero field. Using these selective pulses and level crossing techniques, indirect detection of a quadrupolar nucleus may be accomplished via protons without obtaining the proton background signal in the NQR spectrum. Experimental results from a variety of /sup 1/H, /sup 2/H, and /sup 14/N homo- and heteronuclear systems are presented as an illustration of these techniques.

  14. NQR DETECTION OF SODIUM NITRITE RECRYSTALLIZED IN WOOD Jrmy Jover(1), (3)

    E-print Network

    Paris-Sud XI, Université de

    often used as a model in Nitrogen- 14 Quadrupole Resonance, namely sodium nitrite NaNO2. It hasNQR DETECTION OF SODIUM NITRITE RECRYSTALLIZED IN WOOD Jérémy Jover(1), (3) , Sarra Aissani(1 sample tubes have been impregnated by an aqueous solution of sodium nitrite (NaNO2). They were

  15. Correlated Spin Dynamics and Phase Transitions in Pure and in Disordered 2D S = 1/2 Antiferromagnets: Insights from NMR-NQR

    NASA Astrophysics Data System (ADS)

    Rigamonti, A.; Carretta, P.; Papinutto, N.

    A recall of the phase diagram for two-dimensional quantum Heisenberg antiferromagnets (2DQHAF) and of the main issues involving phase transitions and spin dynamics in these systems is first given. After a pedagogical description of the basic aspects for the NMR-NQR relaxation rates in terms of amplitudes and decay rates of spin fluctuations, the problem of the temperature dependence of the correlation length in prototype, pure 2DQHAF (CFTD and La2CuO4) is addressed. Then spin- and charge-doped systems (Zn/Mg for Cu and Sr for La substitutions in La2CuO4) are considered and the effects on the spin stiffness, on the correlation length and on the staggered Cu2+ magnetic moment are reported, in particular near the percolation threshold. A critical outline of the properties of the cluster spin glass phase in Sr- doped La2CuO4 is given. Finally the results of a 63Cu NQR-NMR relaxation study around the quantum critical point (in CeCu6-xAux) are presented. It is pointed out how the 2D response function with anomalous exponent and energy/ temperature scaling indicated by neutron scattering is basically confirmed, while the 63Cu relaxation measurements reveal novel effects involving low-energy spin excitations and the role of an external magnetic field.

  16. Measurement of temperature and temperature gradient in millimeter samples by chlorine NQR

    NASA Astrophysics Data System (ADS)

    Lužnik, Janko; Pirnat, Janez; Trontelj, Zvonko

    2009-09-01

    A mini-thermometer based on the 35Cl nuclear quadrupole resonance (NQR) frequency temperature dependence in the chlorates KClO3 and NaClO3 was built and successfully tested by measuring temperature and temperature gradient at 77 K and higher in about 100 mm3 active volume of a mini Joule-Thomson refrigerator. In the design of the tank-circuit coil, an array of small coils connected in series enabled us (a) to achieve a suitable ratio of inductance to capacity in the NQR spectrometer input tank circuit, (b) to use a single crystal of KClO3 or NaClO3 (of 1-2 mm3 size) in one coil as a mini-thermometer with a resolution of 0.03 K and (c) to construct a system for measuring temperature gradients when the spatial coordinates of each chlorate single crystal within an individual coil are known.

  17. Anomalous H/D isotope effect on 35Cl NQR frequencies in piperidinium p-chlorobenzoate

    NASA Astrophysics Data System (ADS)

    Nakano, Ryo; Honda, Hisashi; Kimura, Taiki; Nakata, Eiichi; Takamizawa, Satoshi; Noro, Sumiko; Ishimaru, Shin'ichi

    2008-01-01

    Anomalous isotope effects were detected in the 35Cl nuclear quadrupole resonance (NQR) frequency of piperidinium p-chlrobenzoate (C5H10NH· ClC6H4COOH) by deuteration of hydrogen atoms. The atoms were determined to form two kinds of N H···O type H-bonds in the crystal structure. Large frequency shifts of the 35Cl resonance lines reaching 288 kHz at 77 K and 278 kHz at room temperature were caused upon deuteration, in spite of the fact that the Cl atoms in the molecule do not form hydrogen bonds in the crystal. Results of single crystal X-ray diffraction measurements and density-functional-theorem calculations suggest that a dihedral-angle change of 1.8° between benzene and the piperidine ring contributes to 35Cl NQR anomalous frequency shifts.

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

    NASA Astrophysics Data System (ADS)

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

    2004-07-01

    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.

  19. Critical behavior study of antiferromagnetism in isostructural La2CuO4+? and La2NiO4+?

    NASA Astrophysics Data System (ADS)

    White, Benjamin; Neumeier, John; Erb, A.

    2009-03-01

    Neutron diffraction [1] and nuclear quadruple resonance [2] experiments coupled with theory calculations provide substantial evidence to support the widely-accepted belief that the two-dimensional Heisenberg model describes the antiferromagnetic interactions in La2CuO4 (S = .5ex1-.1em/ -.15em.25ex2 ) and La2NiO4 (S = 1). The heat capacity critical exponent ?, which could provide further evidence, has never been studied in these two compounds because of the weak nature of the anomalies at TN. [3] We will present heat capacity and high-resolution thermal expansion measurements of La2CuO4 and La2NiO4 single crystals, grown by the floating-zone method, and an analysis of ? within the context of predicted values for a variety of universality classes. This material is based upon work supported by the NSF (DMR-0504769) and US DOE Office of Basic Energy Sciences (DE-FG-06ER46269) [1] Y. Endoh et al., PRB 37, 7443 (1988); G. Aeppli and D.J. Buttrey, PRL 61, 203 (1988). [2] P. Carretta, A. Rigamonti, and R. Sala, PRB 55, 3734 (1997). [3] T. Kyomen et al., PRB 60, 14841 (1999); K. Sun et al., PRB 43, 239 (1991).

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

    SciTech Connect

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

    1980-12-01

    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.

  1. Anomalous HID isotope effect on 35Cl NQR frequencies in piperidinium p-chlorobenzoate

    NASA Astrophysics Data System (ADS)

    Nakano, Ryo; Honda, Hisashi; Kimura, Taiki; Nakata, Eiichi; Takamizawa, Satoshi; Noro, Sumiko; Ishimaru, Shin'ichi

    Anomalous isotope effects were detected in the 35CI nuclear quadrupole resonance (NQR) frequency of piperidinium p-chlrobenzoate (C5H10NH· CIC6H4COOH) by deuteration of hydrogen atoms. The atoms were determined to form two kinds of N-H...O type H-bonds in the crystal structure. Large frequency shifts of the 35CI resonance lines reaching 288 kHz at 77 K and 278 kHz at room temperature were caused upon deuteration, in spite of the fact that the CI atoms in the molecule do not form hydrogen bonds in the crystal. Results of single crystal X-ray diffraction measurements and density-functional-theorem calculations suggest that a dihedral-angle change of 1.8° between benzene and the piperidine ring contributes to 35CINQR anomalous frequency shifts.

  2. Low Frequency NQR using Double Contact Cross-relaxation

    NASA Astrophysics Data System (ADS)

    Stephenson, David; Smith, John A. S.

    2000-02-01

    A cross-relaxation technique is described which involves two spin contacts per double reso-nance cycle. The result is an improvement in signal to noise ratio particularly at low frequencies. Experimental spectra and analyses are presented: 14N in ammonium sulphate showing that the tech-nique gives essentially the same information as previous studies; 14N in ammonium dichromate determining e2Qq/h as (76±3) kHz and ? = 0.84±.04; 7Li in lithium acetylacetonate for which the spectrum (corrected for Zeeman distortion) yields e2Qq/h = (152 ±5) kHz and ?=.5 ±.2. Calculated spectra are presented to demonstrate the ? dependence of the line shapes for 7Li.

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

    SciTech Connect

    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

    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.

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

    SciTech Connect

    Ziegeweid, M.A.

    1995-11-29

    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.

  5. NQR experiments on Sc-Y alloys at very low temperatures. [Absolute thermometry below 500[mu]K

    SciTech Connect

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

    1992-10-01

    The authors performed Nuclear Quadrupole Resonance (NQR) experiments on an alloy of scandium and yttrium. They find that the characteristic resonance frequencies in zero external field are 50% larger than in pure scandium. This increase in frequency makes the Sc-Y alloy a better candidate for absolute thermometry below 500 [mu]K. However, the spin-lattice relaxation time of this alloy is more than an order of magnitude longer than in the pure scandium. In addition, an abrupt increase in the Korringa constant was observed for temperatures below 5mK.

  6. Successive magnetic transition in non-centrosymmetric CeCoGe3 probed by Co-NQR

    NASA Astrophysics Data System (ADS)

    Matsumura, M.; Sato, Y.; Mizoo, M.; Kawamura, Y.; Kato, H.; Nishioka, T.

    2011-01-01

    Co-NQR measurements for non-centrosymmetric superconductor CeCoGe3 have been performed in ambient and under pressure up to 1.5 GPa to investigate the magnetic structures for the successive magnetic transition at TN1=21 K, TN2=12 K and TN3=8 K. In ambient pressure, the crystallographically equivalent one Co site becomes three sites at TN1 > T > TN2, and further becomes four sites at TN2 > T. Applying pressure at 4.2 K, the four Co sites becomes two sites above 0.3 Gpa. These Co sites acquire slightly different internal field parallel to the c-axis, consistent with the anisotropic magnetization with easy c-axis. The T-dependences of the internal fields and the spectral weights for respective sites are estimated. The magnetic structure in each phase is discussed referring to the recent results of neutron scattering.

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

    NASA Technical Reports Server (NTRS)

    Borsa, F.; Rigamonti, A.

    1991-01-01

    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.

  8. Oxygen Content Dependence of 63Cu(1) NQR and Proton NMR in Hydrogen-Doped Antiferromagnetic YBa2Cu3O6+xHy

    NASA Astrophysics Data System (ADS)

    Niki, Haruo; Kano, Kikuhiro; Takase, Mitsuhiro; Majikina, Kensei; Yagasaki, Katsuma; Shinohara, Takeshi; Omori, Mamoru; Tomiyoshi, Shoichi; Akiba, Etsuo

    1998-07-01

    The oxygen content dependence of 63Cu NQR at the Cu(1) site and proton NMR have been measured in the antiferromagnetic phase of powdered samples of hydrogen-doped YBa2Cu3O6+xHy (0.07 NQR occur around 35 and 15 K, respectively. These enhancements increase with increasing oxygen concentration. The maximum values of T1-1 and T2-1 for the sample with x = 0.17 reach 200 sec-1 and more than 7 msec-1, respectively. The predominant source for the relaxation mechanism of 63Cu(l) NQR and the line broadening of 1H NMR are found to be the fluctuating magnetic field due to the staggered Cu2+ moments.

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

    SciTech Connect

    Not Available

    1991-01-14

    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.

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

    SciTech Connect

    Murty, A.N.

    1992-05-04

    During this period, we focused our attention in analyzing the magnetic nature of the extensively used trimetallic catalyst system Cu-Co-Cr for the production of higher alcohols. We believe that there could be some correspondence between the catalytic and magnetic behaviors of the transition metal catalyst systems. Both the morphology and metallic charge distribution of the particles are known to govern the catalytic as well as the magnetic properties of the system.

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

    SciTech Connect

    Not Available

    1992-04-15

    During this period, we focused our attention in analyzing the magnetic nature of the extensively used trimetallic catalyst system Cu-Co-Cr for the production of higher alcohols. We believe that there could be some correspondence between the catalytic and magnetic behaviors of the transition metal catalyst systems. Both the morphology and metallic charge distribution of the particles are know to govern the catalytic as well as the magnetic properties of the system. Based on this concept, we have extensively examined the Cu/Co system varying Cu/Co ratio from 0.2--4.0. Spectroscopic results are outlined herein. (VC)

  12. (14) N nuclear quadrupole resonance study of piroxicam: confirmation of new polymorphic form v.

    PubMed

    Lavri?, Zoran; Pirnat, Janez; Lužnik, Janko; Puc, Uroš; Trontelj, Zvonko; Sr?i?, Stane

    2015-06-01

    A new polymorphic crystal form of piroxicam was discovered while preparing crystalline samples of piroxicam for (14) N nuclear quadrupole resonance (NQR) analysis. The new crystal form, designated as V, was prepared by evaporative recrystallization from dichloromethane. Three known polymorphic forms (I, II, and III) were also prepared. Our aim was to apply (14) N NQR to characterize the new polymorphic form of piroxicam and compare the results with those of the other known polymorphic forms. Additional analytical methods used for characterization were X-ray powder diffraction (XRPD), thermal analysis, and vibrational spectroscopy. For the first time, a complete set of nine characteristic (14) N NQR frequencies was found for each prepared polymorph of piroxicam. The consistent set of measured frequencies and calculated characteristic quadrupole parameters found for the new polymorphic form V is a convincing evidence that we are dealing with a new form. The already known piroxicam polymorphic forms were characterized similarly. The XRPD results were in accordance with the conclusions of (14) N NQR analysis. The performed study clearly demonstrates a strong potential of (14) N NQR method to be applied as a highly discriminative spectroscopic analytical tool to characterize polymorphic forms. © 2015 Wiley Periodicals, Inc. and the American Pharmacists Association J Pharm Sci 104:1909-1918, 2015. PMID:25776345

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

    NASA Technical Reports Server (NTRS)

    Borsa, F.; Rigamonti, A.

    1990-01-01

    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.

  14. Vibrational pseudo-diffusive motion of the oxygen octahedra in La{sub 2}CuO{sub 4} and Sr doped La{sub 2}CuO{sub 4} from anelastic and {sup 139}La NQR relaxation

    SciTech Connect

    Cordero, F. [CNR, Roma (Italy)] [CNR, Roma (Italy); Campana, A.; Corti, M.; Rigamonti, A. [Unita INFM, Pavia (Italy)] [Unita INFM, Pavia (Italy); Cantelli, R. [Univ. di Roma La Sapienza (Italy). Dipt. di Fisica] [Univ. di Roma La Sapienza (Italy). Dipt. di Fisica; Ferretti, M. [Univ. di Genova (Italy). Dipt. di Chimica e Chimica Industriale] [Univ. di Genova (Italy). Dipt. di Chimica e Chimica Industriale

    1999-04-20

    The vibrational dynamics in nearly stoichiometric La{sub 2}CuO{sub 4+{delta}} has been studied by means of anelastic relaxation and by {sup 139}La NQR relaxation. Evidence of dynamical tilting of the octahedra in a double well local potential is obtained with both the experimental techniques. Anelastic relaxation at the quadrupole frequency {nu}{sub Q} {approximately} 19 MHz occurs at T {approximately} 330 K. The data are analyzed in terms of a model of pseudo-diffusive cooperative motion. The measured effective barrier is 2800 K, higher than the one of the local potential because of the cooperative character of the motion. Upon Sr doping the {sup 139}La relaxation is still dominated by the octahedra tilting waves for T > 100 K, while at low temperatures the magnetic relaxation mechanism related to Cu{sup 2+} spin fluctuation dominates. It is argued how the freezing of the tilts (occurring below 100 K in the undoped La{sub 2}CuO{sub 4}) might correspond to the formation of static stripes.

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

    NASA Astrophysics Data System (ADS)

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

    2012-07-01

    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.

  16. Spin dynamics in a two-dimensional disordered S=(1)/(2) Heisenberg paramagnet from {sup 63}Cu NQR relaxation in Zn-doped La{sub 2}CuO{sub 4}

    SciTech Connect

    Carretta, P.; Rigamonti, A.; Sala, R. [Department of Physics A. Volta, Unita INFM and Sezione INFN di Pavia, Via Bassi, 6, 27100-I Pavia (Italy)] [Department of Physics A. Volta, Unita INFM and Sezione INFN di Pavia, Via Bassi, 6, 27100-I Pavia (Italy)

    1997-02-01

    {sup 63}Cu NQR T{sub 1} and T{sub 2} relaxation measurements in La{sub 2}Cu{sub 1{minus}x}Zn{sub x}O{sub 4}, for 0{le}x{le}0.11 and in the temperature range T{sub N}{le}T{le}900 K, are presented. The results are used to derive insights into the Cu{sup 2+} correlated spin dynamics in the paramagnetic phase of the S=(1)/(2) two-dimensional (2D) Heisenberg (H) antiferromagnets (AF), and into the disorder effects associated with the spin vacancy due to Zn{sup 2+} (S=0) for Cu{sup 2+} substitution. In particular, by using scaling arguments for the static generalized susceptibility, {chi}({rvec q},0), and for the decay rate, {Gamma}{sub {rvec q}}, of the normal excitations, T{sub 2} and T{sub 1} are related to the in-plane correlation length {xi}{sub 2D}(x,T) and its dependence on temperature and Zn doping, x, is extracted. The experimental findings are analyzed in light of the quantum critical and renormalized classical behaviors for {xi}{sub 2D} predicted by recent theories for S=1/2 HAF on square lattices. It is shown that up to T{approx_equal}900 K, {xi}{sub 2D} is consistent with the assumption of a renormalized classical regime, in agreement with recent neutron scattering results and at variance with previous interpretations of the NQR data. It is discussed how Zn affects {xi}{sub 2D} through the modification in the spin stiffness and comparison with the disorder induced by itinerant extra holes is made.

  17. Zero field NMR and NQR

    SciTech Connect

    Zax, D.B.; Bielecki, A.; Zilm, K.W.; Pines, A.; Weitekamp, D.P.

    1985-11-15

    Methods are described and demonstrated for detecting the coherent evolution of nuclear spin observables in zero magnetic field with the full sensitivity of high field NMR. The principle motivation is to provide a means of obtaining solid state spectra of the magnetic dipole and electric quadrupole interactions of disordered systems without the line broadening associated with random orientation with respect to the applied magnetic field. Comparison is made to previous frequency domain and high field methods. A general density operator formalism is given for the experiments where the evolution period is initiated by a sudden switching to zero field and is terminated by a sudden restoration of the field. Analytical expressions for the signals are given for a variety of simple dipolar and quadrupolar systems and numerical simulations are reported for up to six coupled spin-1/2 nuclei. Experimental results are reported or reviewed for /sup 1/H, /sup 2/D, /sup 7/Li, /sup 13/C, and /sup 27/Al nuclei in a variety of polycrystalline materials. The effects of molecular motion and bodily sample rotation are described. Various extensions of the method are discussed, including demagnetized initial conditions and correlation by two-dimensional Fourier transformation of zero field spectra with themselves or with high field spectra.

  18. Nuclear quadrupole resonance studies of the SORC sequence and nuclear magnetic resonance studies of polymers

    SciTech Connect

    Jayakody, J.R.P.

    1993-12-31

    The behavior of induction signals during steady-state pulse irradiation in {sup 14}N NQR was investigated experimentally. Because Strong Off-resonance Comb (SORC) signals recur as long as the pulsing continues, very efficient signal-averaging can result. The dependence of these steady-state SORC signals on pulse parameters and on frequency offset are presented, together with a discussion of the applicability of the method. Also as part of the NQR work, cocaine base has been detected using conventional NQR techniques. The experimental results show that SORC detection can be of sufficient sensitivity to form the basis of narcotics screening devices for both mail and airline baggage. A new NMR technique, to obtain the correlation time of the random thermal motion of a polymer at temperatures near the glass transition has been introduced. The temperature dependence is a result of thermal motion. For slow-motion of a polymer chain near the glass transition, the CSA parameter begins to decrease. This motional narrowing can be interpreted to yield the correlation time of the thermal motion. In this work nitrocellulose isotopically highly enriched with {sup 15}N was studied at four different temperatures between 27{degrees} and 120{degrees} Celsius and the correlation times for polymer backbone motions were obtained. Naflon films containing water (D{sub 2}O and H{sub 2} {sup 17}O) and methanol (CH{sub 3}OD, CH{sub 3} {sup 17}OH), have been studied using deuteron and oxygen-17 NMR spectroscopy. Glassy behavior of the water domains at low temperature is evidenced by the specific nature of the {sup 2}H NMR lineshapes. Activation energies extracted from {sup 2}H spin-lattice relaxation data on the high temperature side of the T{sub 1} minimum exhibit a steady increase with increasing water content. In spite of a high degree of molecular mobility, angular-dependent spectra of both unstretched and stretched samples reflect considerable anisotrophy of the host polymer.

  19. Superconducting fluctuations and {sup 63}Cu NQR-NMR relaxation in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}: Effect of magnetic field and a test for the pairing-state symmetry

    SciTech Connect

    Carretta, P. [Department of Physics ``A. Volta,`` Sezione di Pavia, Istituto Nazionale di Fisica Nucleare and Unita Instituto Nazionale di Fisica della Materia, University of Pavia, Via Bassi 6, I-27100, Pavia (Italy)] [Department of Physics ``A. Volta,`` Sezione di Pavia, Istituto Nazionale di Fisica Nucleare and Unita Instituto Nazionale di Fisica della Materia, University of Pavia, Via Bassi 6, I-27100, Pavia (Italy); Livanov, D.V. [Department of Theoretical Physics, Moscow Institute of Steel and Alloys, 117936 Moscow (Russia)] [Department of Theoretical Physics, Moscow Institute of Steel and Alloys, 117936 Moscow (Russia); Rigamonti, A. [Department of Physics ``A. Volta,`` Sezione di Pavia, Istituto Nazionale di Fisica Nucleare and Unita Instituto Nazionale di Fisica della Materia, University of Pavia, Via Bassi 6, I-27100, Pavia (Italy)] [Department of Physics ``A. Volta,`` Sezione di Pavia, Istituto Nazionale di Fisica Nucleare and Unita Instituto Nazionale di Fisica della Materia, University of Pavia, Via Bassi 6, I-27100, Pavia (Italy); Varlamov, A.A. [Department of Theoretical Physics, Moscow Institute of Steel and Alloys, 117936 Moscow (Russia)] [Department of Theoretical Physics, Moscow Institute of Steel and Alloys, 117936 Moscow (Russia); [Laboratorium ``Forum,`` Instituto Nazionale di Fisica della Materia, Department of Physics, University of Florence, Florence (Italy)

    1996-10-01

    Evidence is presented of superconducting fluctuations in the {sup 63}Cu NQR-NMR relaxation rate in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}, as obtained from a careful comparison of measurements carried out in the absence and in the presence of a field parallel to the {ital c} axis. It is shown that the field causes a reduction of the relaxation rate {ital W} in a range of about 10 K above {ital T}{sub {ital c}}. This effect is related to the suppression by the magnetic field of the phase-sensitive positive Maki-Thompson contribution while the negative contribution from the DOS fluctuations is almost field independent. Furthermore, it is argued how the fluctuation effects on {ital W} can be used to discuss the pairing state symmetry, at variance with the insensitivity of the transport measurements. It is pointed out that the existence of the Maki-Thompson contribution to {ital W} evidences an {ital s}-wave symmetry component for the pairing in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. {copyright} {ital 1996 The American Physical Society.}

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

    SciTech Connect

    Not Available

    1991-01-14

    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.

  1. NQR-NMR studies of higher alcohol synthesis Cu-Co catalysts. Quarterly technical progress report, December 15, 1991--March 15, 1992

    SciTech Connect

    Murty, A.N.

    1992-05-04

    During this period, we focused our attention in analyzing the magnetic nature of the extensively used trimetallic catalyst system Cu-Co-Cr for the production of higher alcohols. We believe that there could be some correspondence between the catalytic and magnetic behaviors of the transition metal catalyst systems. Both the morphology and metallic charge distribution of the particles are known to govern the catalytic as well as the magnetic properties of the system.

  2. NQR-NMR studies of higher alcohol synthesis Cu-Co catalysts. Quarterly technical progress report, December 15, 1991--March 15, 1992

    SciTech Connect

    Not Available

    1992-04-15

    During this period, we focused our attention in analyzing the magnetic nature of the extensively used trimetallic catalyst system Cu-Co-Cr for the production of higher alcohols. We believe that there could be some correspondence between the catalytic and magnetic behaviors of the transition metal catalyst systems. Both the morphology and metallic charge distribution of the particles are know to govern the catalytic as well as the magnetic properties of the system. Based on this concept, we have extensively examined the Cu/Co system varying Cu/Co ratio from 0.2--4.0. Spectroscopic results are outlined herein. (VC)

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

    NASA Astrophysics Data System (ADS)

    Jayakody, Jayakody R. Pemadasa

    1993-01-01

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

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

    SciTech Connect

    Bota, K.B.

    1991-01-01

    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.

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

    SciTech Connect

    Bota, K.B.

    1991-12-31

    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.

  6. Regulation of expression of Na + -translocating NADH:quinone oxidoreductase genes in Vibrio harveyi and Klebsiella pneumoniae

    Microsoft Academic Search

    Maria S. Fadeeva; Evgenia A. Yakovtseva; Galina A. Belevich; Yulia V. Bertsova; Alexander V. Bogachev

    2007-01-01

    The expression of genes encoding sodium-translocating NADH:quinone oxidoreductase (Na+-NQR) was studied in the marine bacterium Vibrio harveyi and in the enterobacterium Klebsiella pneumoniae. It has been shown that such parameters as NaCl concentration, pH value, and presence of an uncoupler in the growth media\\u000a do not influence significantly the level of nqr expression. However, nqr expression depends on the growth

  7. Pure Nuclear Quadrupole Resonance Techniques for Quantum Computation

    NASA Astrophysics Data System (ADS)

    Huang, Wei-Han; Chen, Zilong; Chuang, Isaac

    2003-03-01

    Pure nuclear quadrupole resonance (NQR) at zero magnetic field provides an accessible means for experimentation with the techniques of quantum computation. We present the design and implementation of a novel benchtop NQR apparatus utilizing modern communication electronics, and featuring a high efficiency, low cost class E amplifier with an integrated and tunable probe. Using this apparatus, we study the chlorine and nitrogen NQR resonances in para-dichlorobenzene and sodium nitrite, applying multiple pulse excitation sequences derived using methods of quantum circuits.

  8. Superconducting clusters and phase separation in Pr1+xBa2-xCu3O7+?: A 63,65Cu nuclear quadrupole resonance and zero-field NMR study

    NASA Astrophysics Data System (ADS)

    Grévin, B.; Berthier, Y.; Mendels, P.; Collin, G.

    2000-02-01

    We present a study on the effect of the Pr3+ substitution for Ba2+ in the Pr1+xBa2-xCu3O7+? system, where small superconducting fractions have been observed in some of the samples with x in the range 0.1NQR) and zero-field NMR are reported for the x=0.3 sample Pr1.3Ba1.7Cu3O7+? in which the largest superconducting fraction has been detected below 90 K. 63,65Cu NQR in this sample shows the presence of a fraction of metallic copper in the CuO2 planes and confirms that the substitution of Pr onto Ba sites leads to oxygen interchain sites O(5) occupancy. The existence of two different magnetic Cu(2) sites is evidenced for x=0.3 from the comparison of the Cu(2) zero-field NMR in the x=0 and x=0.3 samples. The whole set of results is interpreted in the framework of a phase separation mechanism in the CuO2 planes induced by the Ba/Pr substitution. Three characteristic domains are involved, in which respectively localized holes are present, no holes are transferred, and mobile holes reside. We present a model where the observed superconductivity is due to a segregation of local defects in the structure which gives a distribution of clusters containing mobile holes. A local weakening of the Pr4f-O2p hybridization by the Pr/Ba substitution is argued to explain the presence of these clusters.

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

    PubMed Central

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

    2014-01-01

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

  10. Optimal filtering in multipulse sequences for nuclear quadrupole resonance detection

    NASA Astrophysics Data System (ADS)

    Osokin, D. Ya.; Khusnutdinov, R. R.; Mozzhukhin, G. V.; Rameev, B. Z.

    2014-05-01

    The application of the multipulse sequences in nuclear quadrupole resonance (NQR) detection of explosive and narcotic substances has been studied. Various approaches to increase the signal to noise ratio (SNR) of signal detection are considered. We discussed two modifications of the phase-alternated multiple-pulse sequence (PAMS): the 180° pulse sequence with a preparatory pulse and the 90° pulse sequence. The advantages of optimal filtering to detect NQR in the case of the coherent steady-state precession have been analyzed. It has been shown that this technique is effective in filtering high-frequency and low-frequency noise and increasing the reliability of NQR detection. Our analysis also shows the PAMS with 180° pulses is more effective than PSL sequence from point of view of the application of optimal filtering procedure to the steady-state NQR signal.

  11. ESEEM study of the plastoquinone anion radical (QA.--) in 14N- and 15N-labeled photosystem II treated with CN.

    PubMed

    Deligiannakis, Y; Boussac, A; Rutherford, A W

    1995-12-12

    The nonheme iron of the photosystem II reaction center was converted to its low-spin state (S = 0) by treatment with CN-. This allowed the study of the plastoquinone, QA- anion radical by electron spin-echo envelope modulation (ESEEM) spectroscopy. A comparative analysis of the ESEEM data of QA- in 14N- and 15N-labeled PSII demonstrates the existence of a protein nitrogen nucleus coupled to the QA-. The 14N coupling is characterized by a quadrupolar coupling constant e2qQ/4h = 0.82 MHz, an asymmetry parameter eta = 0.45, and hyperfine coupling constant A approximately 2.1 MHz. The 15N hyperfine coupling is characterized by T = 0.41 MHz and alpha iso approximately 3.3 MHz. The possible origins of the nitrogen hyperfine coupling are discussed in terms of the amino acids thought to be close to the QA- in PSII. Based on a comparison of the 14N ESEEM with 14N-NQR and 14N-ESEEM data from the literature, the most likely candidate is the amide nitrogen of the peptide backbone of Ala261 of the polypeptide D2, although the indole nitrogen of Trp254 and the imino nitrogen of His215 of D2 also remain candidates. PMID:8519759

  12. Experimental implementation of quantum information processing by Zeeman-perturbed nuclear quadrupole resonance

    NASA Astrophysics Data System (ADS)

    Teles, João; Rivera-Ascona, Christian; Polli, Roberson S.; Oliveira-Silva, Rodrigo; Vidoto, Edson L. G.; Andreeta, José P.; Bonagamba, Tito J.

    2015-03-01

    Nuclear magnetic resonance (NMR) has been widely used in the context of quantum information processing (QIP). However, despite the great similarities between NMR and nuclear quadrupole resonance (NQR), no experimental implementation for QIP using NQR has been reported. We describe the implementation of basic quantum gates and their applications on the creation and manipulation of pseudopure states using linearly polarized radiofrequency pulses under static magnetic field perturbation. The NQR quantum operations were implemented using a single-crystal sample of {KClO}3 and observing ^{35}{Cl} nuclei, which possess spin 3/2 and give rise to a two-qubit system. The results are very promising and indicate that NQR can be successfully used for performing fundamental experiments in QIP. One advantage of NQR in comparison with NMR is that the main interaction is internal to the sample, which makes the system more compact, lowering its cost and making it easier to be miniaturized to solid-state devices. Furthermore, as an example, the study of squeezed spin states could receive relevant contributions from NQR.

  13. Experimental implementation of quantum information processing by Zeeman-perturbed nuclear quadrupole resonance

    NASA Astrophysics Data System (ADS)

    Teles, João; Rivera-Ascona, Christian; Polli, Roberson S.; Oliveira-Silva, Rodrigo; Vidoto, Edson L. G.; Andreeta, José P.; Bonagamba, Tito J.

    2015-06-01

    Nuclear magnetic resonance (NMR) has been widely used in the context of quantum information processing (QIP). However, despite the great similarities between NMR and nuclear quadrupole resonance (NQR), no experimental implementation for QIP using NQR has been reported. We describe the implementation of basic quantum gates and their applications on the creation and manipulation of pseudopure states using linearly polarized radiofrequency pulses under static magnetic field perturbation. The NQR quantum operations were implemented using a single-crystal sample of and observing nuclei, which possess spin 3/2 and give rise to a two-qubit system. The results are very promising and indicate that NQR can be successfully used for performing fundamental experiments in QIP. One advantage of NQR in comparison with NMR is that the main interaction is internal to the sample, which makes the system more compact, lowering its cost and making it easier to be miniaturized to solid-state devices. Furthermore, as an example, the study of squeezed spin states could receive relevant contributions from NQR.

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

    Microsoft Academic Search

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

    2004-01-01

    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

  15. Superconductivity and magnetic fluctuations in Cd(2))Re(2)O(7) via Cd nuclear magnetic resonance and re nuclear quadrupole resonance.

    PubMed

    Vyaselev, O; Arai, K; Kobayashi, K; Yamazaki, J; Kodama, K; Takigawa, M; Hanawa, M; Hiroi, Z

    2002-07-01

    We report Cd nuclear magnetic resonance (NMR) and Re nuclear quadrupole resonance (NQR) studies on Cd(2)Re(2)O(7), the first superconductor among pyrochlore oxides (T(c) approximately 1 K). The Re NQR spectrum at zero magnetic field below 100 K rules out any magnetic or charge order. The spin-lattice relaxation rate below T(c) exhibits a pronounced coherence peak and follows the weak-coupling BCS theory with nearly isotropic energy gap. The results of Cd NMR point to a moderate ferromagnetic enhancement at high temperatures followed by a rapid decrease of the density of states below the structural transition temperature of 200 K. PMID:12097064

  16. Low-temperature order in the heavy-fermion compound CeCu{sub 6}

    SciTech Connect

    Pollack, L.; Hoch, M.J.R.; Jin, C.; Smith, E.N.; Parpia, J.M.; Hawthorne, D.L.; Geller, D.A.; Lee, D.M.; Richardson, R.C. [Cornell Microkelvin Laboratory, Materials Science Center, Cornell University, Ithaca, New York 14853 (United States); Hinks, D.G. [Argonne National Laboratory, Argonne, Illinois 60439 (United States); Bucher, E. [AT& T Bell Laboratories, Murray Hill, New Jersey 07974 (United States)

    1995-12-01

    We have used nuclear-quadrupole-resonance (NQR) techniques to study Cu nuclei in two single-crystal samples of CeCu{sub 6} between 200 {mu}K and 20 mK. We present measurements of the NQR intensities and spin-lattice relaxation times, {ital T}{sub 1}, at frequencies corresponding to three different sites in the crystal. Below 5 mK we observe deviations from standard metallic behavior in both signal intensity and spin-lattice relaxation times. These deviations are unusual in that they are site dependent; they reveal the presence of one or more types of order in this system.

  17. Magnetic field-cycling NMR and 14N, 17O quadrupole resonance in the explosive pentaerythritol tetranitrate (PETN)

    Microsoft Academic Search

    John A. S. Smith; Timothy J. Rayner; Michael D. Rowe; Jamie Barras; Neil F. Peirson; Andrew D. Stevens; Kaspar Althoefer

    2010-01-01

    The explosive pentaerythritol tetranitrate (PETN) C(CH2–O–NO2)4 has been studied by 1H NMR and 14N NQR. The 14N NQR frequency and spin–lattice relaxation time T1Q for the ?+ line have been measured at temperatures from 255 to 325K. The 1H NMR spin–lattice relaxation time T1 has been measured at frequencies from 1.8kHz to 40MHz and at temperatures from 250 to 390K.

  18. Magnetic field-cycling NMR and 14N, 17O quadrupole resonance in the explosive pentaerythritol tetranitrate (PETN)

    Microsoft Academic Search

    John A. S. Smith; Timothy J. Rayner; Michael D. Rowe; Jamie Barras; Neil F. Peirson; Andrew D. Stevens; Kaspar Althoefer

    2010-01-01

    The explosive pentaerythritol tetranitrate (PETN) C(CH2-O-NO2)4 has been studied by 1H NMR and 14N NQR. The 14N NQR frequency and spin-lattice relaxation time T1Q for the nu+ line have been measured at temperatures from 255 to 325 K. The 1H NMR spin-lattice relaxation time T1 has been measured at frequencies from 1.8 kHz to 40 MHz and at temperatures from

  19. Structural and magnetic phase transitions in (Chloroanilinium) 2 CuX 4 (X = Cl, Br)

    Microsoft Academic Search

    T. Asaji

    2004-01-01

    Successive structural phase transitions of (4-ClC6H4NH3)2CuCl4, which occur in a very narrow temperature range were reinvestigated by Fourier transform nuclear quadrupole resonance (FT\\u000a NQR) measurements. The phase transitions at 275.5 and 277.0 K were confirmed. The effect of the deuteration of the ammonium\\u000a end on these transitions was studied. The35Cl NQR frequencies of organic cation were observed to decrease by

  20. A theoretical study of 17O, 14N and 2H nuclear quadrupole coupling tensors in the real crystalline structure of acetaminophen

    NASA Astrophysics Data System (ADS)

    Behzadi, Hadi; Esrafili, Mehdi D.; Hadipour, Nasser L.

    2007-03-01

    A systematic computational investigation was carried out to characterize the 17O, 14N and 2H electric field gradient, EFG, tensors in the acetaminophen real crystalline structure. To include the hydrogen bonding effects in the calculations, the most probable interacting molecules with the target molecule in the crystalline phase were considered through the various molecular clusters. The calculations were performed with the B3LYP method and 6-311++G ?? and 6-311+G ? standard basis sets using the Gaussian 98 suite of programs. Calculated EFG tensors were used to evaluate the 17O, 14N, and 2H nuclear quadrupole resonance, NQR, parameters in acetaminophen crystalline structure, which are in good agreement with the available experimental data. The difference between the calculated NQR parameters of the monomer and molecular clusters shows how much hydrogen bonding interactions affect the EFG tensors of each nucleus. These results indicate that both O-H⋯O and N-H⋯O hydrogen bonding have major influence on the NQR parameters. Moreover, the quantum chemical calculation indicated that the intermolecular hydrogen bonding interactions play an essential role in determining the relative orientation of quadrupole coupling principal components in the molecular frame axes.

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

    NASA Astrophysics Data System (ADS)

    Shore, Jay Sanford

    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.

  2. Energy transducing redox steps of the Na+-pumping NADH:quinone oxidoreductase from Vibrio cholerae

    PubMed Central

    Juárez, Oscar; Morgan, Joel E.; Nilges, Mark J.; Barquera, Blanca

    2010-01-01

    Na+-NQR is a unique respiratory enzyme that couples the free energy of electron transfer reactions to electrogenic pumping of sodium across the cell membrane. This enzyme is found in many marine and pathogenic bacteria where it plays an analogous role to the H+-pumping complex I. It has generally been assumed that the sodium pump of Na+-NQR operates on the basis of thermodynamic coupling between reduction of a single redox cofactor and the binding of sodium at a nearby site. In this study, we have defined the coupling to sodium translocation of individual steps in the redox reaction of Na+-NQR. Sodium uptake takes place in the reaction step in which an electron moves from the 2Fe-2S center to FMNC, while the translocation of sodium across the membrane dielectric (and probably its release into the external medium) occurs when an electron moves from FMNB to riboflavin. This argues against a single-site coupling model because the redox steps that drive these two parts of the sodium pumping process do not have any redox cofactor in common. The significance of these results for the mechanism of coupling is discussed, and we proposed that Na+-NQR operates through a novel mechanism based on kinetic coupling, mediated by conformational changes. PMID:20616050

  3. Quantitative Analysis of Hydration Using Nitrogen-14 Nuclear Quadrupole Resonance.

    PubMed

    Gregorovi?, Alan

    2015-07-01

    Hydration is a quite common process in pharmaceutical solids. Sometimes it is desirable, as it stabilizes the crystal structure; in other cases it is unwanted, as it changes the physical and chemical properties of drugs. We here use (14)N NQR spectroscopy to quantitatively analyze hydration of a model compound, 5-aminotetrazole. (14)N NQR has some great advantages compared to other routinely used techniques to study hydration, like a very simple spectrum, single point calibration, and no need for special sample preparation, but the method's great disadvantage is a rather small sensitivity. Nevertheless, here we demonstrate that (14)N NQR, although being significantly less sensitive than XRD, NIR, and also (35)Cl NQR, is still capable of providing excellent quantitative accuracies. We can achieve errors <1% of the total amount, provided good temperature stabilization is implemented, which then allows long experimental times. We also present results obtained with a SLSE pulse sequence, which is a less robust approach but allows the use of much shorter measuring times (?200×) and could be used for quantitative real time monitoring of hydration or dehydration. PMID:26008906

  4. Molecular orientational order in the mesophases of TBBA : Results of a consistent analysis of neutron, NQR and NMR data (*)

    E-print Network

    Boyer, Edmond

    fois un ordre orientationnel autour du grand axe moléculaire et des fluctuations de cet axe. On trouve que : (i) Dans la phase SmVI, les molécules tournent autour de leur grand axe dans un double potentiel encore, qui varie de ~ 0,15 à ~ 0,06 près de la transition H-C. De plus, les grands axes fluctuent autour

  5. Ultraslow polaron dynamics in low-doped manganites from (139)La NMR-NQR and muon spin rotation.

    PubMed

    Allodi, G; Cestelli Guidi, M; De Renzi, R; Caneiro, A; Pinsard, L

    2001-09-17

    We report a (139)La NMR investigation of low-doped insulating manganite samples (LaMnO(3+delta) and La(1-y)Ca(y)MnO(3+delta)) as a function of temperature. A volume fraction with fast nuclear relaxations was revealed by the inhomogeneous loss of the NMR signal over a broad temperature interval. Comparison with muon spin rotation data demonstrates that the wipeout of the (139)La signal is mainly due to slowly fluctuating electric field gradients. This provides strong evidence for the slow diffusion of lattice excitations, identified with Jahn-Teller small polarons. PMID:11580551

  6. Intermediate-Valence Behavior in the Transition-Metal Oxide CaCu3Ru4O12

    Microsoft Academic Search

    Wolfgang Kraetschmer; Norbert Buettgen; Alois Loidl; Ernst-Wilhelm Scheidt

    2010-01-01

    A detailed study of the electronic properties of strongly correlated CCRO will be presented. Along with transport, \\\\chi(T) and specific heat, we focus on NMR\\/NQR. CCRO is a metallic system with perovskite structure showing non-Fermi-liquid behavior below 2&,slash;K which is inferred from Cp\\/&,slash;T? -ln(T) and a deviation of 1\\/&,slash;T1 (T) from the Korringa law at the copper site [PRB {78},

  7. The origin of the sodium-dependent NADH oxidation by the respiratory chain of Klebsiella pneumoniae

    Microsoft Academic Search

    Yulia V Bertsova; Alexander V Bogachev

    2004-01-01

    Properties of Klebsiella pneumoniae respiratory chain enzymes catalyzing NADH oxidation have been studied. Using constructed K. pneumoniae mutant strains, it was shown that three enzymes belonging to different families of NADH:quinone oxidoreductases operate in this bacterium. The NDH-2-type enzyme is not coupled with energy conservation, the NDH-1-type enzyme is a primary proton pump, and the NQR-type enzyme is homologous to

  8. Cu nuclear magnetic resonance of aligned single crystals of YBa/sub 2/Cu/sub 3/O/sub 7/. sqrt. /sub delta/

    SciTech Connect

    Pennington, C.H.; Durand, D.J.; Zax, D.B.; Slichter, C.P.; Rice, J.P.; Ginsberg, D.M.

    1988-05-01

    There are two types of Cu sites in YBa/sub 2/Cu/sub 3/O/sub 7/..sqrt../sub delta/, plane and chain. One gives a nuclear quadrupole resonance (NQR) at 22.0 MHz, the other at 31.5 MHz. Measurements of nuclear spin-lattice relaxation time in the superconducting state show that the 31.5-MHz site has a much larger energy gap (as though its T/sub c/ were 200 K), but different experimental workers have differed as to whether this is the chain or plane site. We report nuclear magnetic resonance (NMR) studies at 81.1 kG and 100 K on oriented single crystals, and conclude from symmetry arguments that the 31.5-MHz NQR arises from the plane site.

  9. Effects of charge inhomogeneities on elementary excitations in La2-xSrxCuO?

    DOE PAGESBeta

    Park, S. R.; Hamann, A.; Pintschovius, L.; Lamago, D.; Khaliullin, G.; Fujita, M.; Yamada, K.; Gu, G. D.; Tranquada, J. M.; Reznik, D.

    2011-12-01

    Purely local experimental probes of many copper oxide superconductors show that their electronic states are inhomogeneous in real space. For example, scanning tunneling spectroscopic imaging shows strong variations in real space, and according to nuclear quadrupole resonance (NQR) studies, the charge distribution in the bulk varies on the nanoscale. However, the analysis of the experimental results utilizing spatially averaged probes often ignores this fact. We have performed a detailed investigation of the doping dependence of the energy and linewidth of the zone-boundary Cu-O bond-stretching vibration in La2-xSrxCuO? by inelastic neutron scattering. Both our results as well as previously reported angle-dependentmore »momentum widths of the electronic spectral function detected by angle-resolved photoemission can be reproduced by including the same distribution of local environments extracted from the NQR analysis.« less

  10. Effects of charge inhomogeneities on elementary excitations in La2-xSrxCuO?

    SciTech Connect

    Park, S. R.; Hamann, A.; Pintschovius, L.; Lamago, D.; Khaliullin, G.; Fujita, M.; Yamada, K.; Gu, G. D.; Tranquada, J. M.; Reznik, D.

    2011-12-01

    Purely local experimental probes of many copper oxide superconductors show that their electronic states are inhomogeneous in real space. For example, scanning tunneling spectroscopic imaging shows strong variations in real space, and according to nuclear quadrupole resonance (NQR) studies, the charge distribution in the bulk varies on the nanoscale. However, the analysis of the experimental results utilizing spatially averaged probes often ignores this fact. We have performed a detailed investigation of the doping dependence of the energy and linewidth of the zone-boundary Cu-O bond-stretching vibration in La2-xSrxCuO? by inelastic neutron scattering. Both our results as well as previously reported angle-dependent momentum widths of the electronic spectral function detected by angle-resolved photoemission can be reproduced by including the same distribution of local environments extracted from the NQR analysis.

  11. Magnetic and Electronic Properties of URu2Si2 Revealed by Comparison with Nonmagnetic References ThRu2Si2 and LaRu2Si2

    NASA Astrophysics Data System (ADS)

    Emi, Naoya; Hamabata, Ryosuke; Nakayama, Daisuke; Miki, Toshihiro; Koyama, Takehide; Ueda, Koichi; Mito, Takeshi; Kohori, Yoh; Matsumoto, Yuji; Haga, Yoshinori; Yamamoto, Etsuji; Fisk, Zachary; Tsujii, Naohito

    2015-06-01

    We have carried out nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements on ThRu2Si2 and LaRu2Si2, which are the nonmagnetic references of the intriguing heavy fermion URu2Si2. The comparisons of URu2Si2 with the reference materials allow us to analyze the already known NMR and NQR data on URu2Si2 phenomenologically and semiquantitatively. The study of 101Ru-NQR frequency suggests the relatively close electronic configuration of URu2Si2, including the valence of the actinide ion, to that of the tetravalent ThRu2Si2 at high temperatures, as well as the delocalization of 5f electrons at low temperatures. Ising-like spin fluctuations along the c-axis were brought to light by 29Si-NMR data in the so-called hidden order phase of URu2Si2. The unique magnetic property is plausibly associated with the mechanism of the unconventional superconductivity.

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

    Microsoft Academic Search

    Vadim S Grechishkin; Nikolai Ya Sinyavskii

    1997-01-01

    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.

  13. INSTRUMENTS AND METHODS OF INVESTIGATION: New technologies: nuclear quadrupole resonance as an explosive and narcotic detection technique

    NASA Astrophysics Data System (ADS)

    Grechishkin, Vadim S.; Sinyavskii, Nikolai Ya

    1997-04-01

    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.

  14. Nuclear quadrupole resonance detection of explosives: an overview

    NASA Astrophysics Data System (ADS)

    Miller, Joel B.

    2011-06-01

    Nuclear Quadrupole Resonance (NQR) is a spectroscopic technique closely related to Nuclear Magnetic Resonance (NMR) and Magnetic Resonance Imaging (MRI). These techniques, and NQR in particular, induce signals from the material being interrogated that are very specific to the chemical and physical structure of the material, but are relatively insensitive to the physical form of the material. NQR explosives detection exploits this specificity to detect explosive materials, in contrast to other well known techniques that are designed to detect explosive devices. The past two decades have seen a large research and development effort in NQR explosives detection in the United States aimed at transportation security and military applications. Here, I will briefly describe the physical basis for NQR before discussing NQR developments over the past decade, with particular emphasis on landmine detection and the use of NQR in combating IED's. Potential future directions for NQR research and development are discussed.

  15. European Studies Undergraduate Studies

    E-print Network

    Royal Holloway, University of London

    and humanities. Our 8,500 students work with internationally renowned scholars in 20 academic departments for university study. Campus life revolves around the Students' Union, which runs over 100 societies and sports clubs, and we are recognised as London's best sporting college. #12;3European Studies European Studies

  16. Landmine detection with nuclear quadrupole resonance

    Microsoft Academic Search

    Yingyi Tan; Stacy L. Tantum; Leslie M. Collins

    2002-01-01

    Nuclear quadrupole resonance (NQR) technology for the detection of explosives is of crucial importance in an increasing number of applications. For landmine detection, NQR has proven to be highly effective if the NQR sensor is not exposed to radio frequency interference (RFI). Since strong nonstationary RFI in the field is unavoidable, a robust detection method is required. With the aid

  17. The sky isn't falling... is it? Overview: New directions for R Explorations with the Parrot Virtual Machine The Not Quite R (NQR) Project

    E-print Network

    page-fault locks · Parallel computing is well-supported in R: 16 different packages on CRAN address Virtual Machine Updating R for 64-bit indexing · About 430,000 lines of code in R src directory (370,000 lines in .c files, 60,000 lines in .h files) · Very difficult and time-consuming [5] · Limited

  18. Analysis of the performance of a phase alternated multiple pulse sequence in spin I = 7/2 zero-field NQR spectroscopy

    NASA Astrophysics Data System (ADS)

    Ramamoorthy, A.

    Zero-field nuclear magnetic resonance spectroscopy of solids containing quadrupole nuclei usually results in broad spectral lines. This line-broadening is due mainly to the inhomogeneity of the electric field gradient (EFG) at the quadrupolar nuclear site. High resolution spectra of such solids can be obtained with the application of suitably designed multiple radiofrequency (RF) pulse sequences. The performance is reported for a periodic and cyclic phase alternated multiple RF pulse sequence (PAPS) in a spin I = 7/2 system in zero external magnetic field. Average Hamiltonian theory based on the Magnus expansion is used to solve the time-dependent Liouville-von Neumann equation of motion of the spin system under the effect of the PAPS sequence. Single transition operators are employed in the spin dynamics calculations. It is shown that the multiple pulse seqeuncearation pulse, suppresses the EFG inhomogeneity to a maximum extent when = 2 . [-- ] 2 , where is the prep1 2 2 N 1 2 1

  19. 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.

  20. Ancillary Studies

    Cancer.gov

    Skip to Main Content Home   |   Data   |   Statistics   |   Tools   |   Collaborations   |   Work with Us   |   Publications   |   About   |   Links Ongoing Collaborations CISNET ACS FAVOR Comprehensive Cancer Centers Ancillary Studies Ancillary Studies Year

  1. 1 Women's Studies WOMEN'S STUDIES

    E-print Network

    Vertes, Akos

    1 Women's Studies WOMEN'S STUDIES Students gain knowledge of contemporary feminist theories of the Columbian College of Arts and Sciences' arts and humanities programs, women's studies examines women's lives's programs · Bachelor of Arts with a major in women's studies (http:// bulletin.gwu.edu/arts-sciences/womens-studies

  2. Nursing Studies Nursing Studies highlights

    E-print Network

    Edinburgh, University of

    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

  3. Structure of the V. cholerae Na+-pumping NADH:quinone oxidoreductase.

    PubMed

    Steuber, Julia; Vohl, Georg; Casutt, Marco S; Vorburger, Thomas; Diederichs, Kay; Fritz, Günter

    2014-12-01

    NADH oxidation in the respiratory chain is coupled to ion translocation across the membrane to build up an electrochemical gradient. The sodium-translocating NADH:quinone oxidoreductase (Na(+)-NQR), a membrane protein complex widespread among pathogenic bacteria, consists of six subunits, NqrA, B, C, D, E and F. To our knowledge, no structural information on the Na(+)-NQR complex has been available until now. Here we present the crystal structure of the Na(+)-NQR complex at 3.5 Å resolution. The arrangement of cofactors both at the cytoplasmic and the periplasmic side of the complex, together with a hitherto unknown iron centre in the midst of the membrane-embedded part, reveals an electron transfer pathway from the NADH-oxidizing cytoplasmic NqrF subunit across the membrane to the periplasmic NqrC, and back to the quinone reduction site on NqrA located in the cytoplasm. A sodium channel was localized in subunit NqrB, which represents the largest membrane subunit of the Na(+)-NQR and is structurally related to urea and ammonia transporters. On the basis of the structure we propose a mechanism of redox-driven Na(+) translocation where the change in redox state of the flavin mononucleotide cofactor in NqrB triggers the transport of Na(+) through the observed channel. PMID:25471880

  4. Localization of Ubiquinone-8 in the Na+-pumping NADH:Quinone Oxidoreductase from Vibrio cholerae*

    PubMed Central

    Casutt, Marco S.; Nedielkov, Ruslan; Wendelspiess, Severin; Vossler, Sara; Gerken, Uwe; Murai, Masatoshi; Miyoshi, Hideto; Möller, Heiko M.; Steuber, Julia

    2011-01-01

    Na+ is the second major coupling ion at membranes after protons, and many pathogenic bacteria use the sodium-motive force to their advantage. A prominent example is Vibrio cholerae, which relies on the Na+-pumping NADH:quinone oxidoreductase (Na+-NQR) as the first complex in its respiratory chain. The Na+-NQR is a multisubunit, membrane-embedded NADH dehydrogenase that oxidizes NADH and reduces quinone to quinol. Existing models describing redox-driven Na+ translocation by the Na+-NQR are based on the assumption that the pump contains four flavins and one FeS cluster. Here we show that the large, peripheral NqrA subunit of the Na+-NQR binds one molecule of ubiquinone-8. Investigations of the dynamic interaction of NqrA with quinones by surface plasmon resonance and saturation transfer difference NMR reveal a high affinity, which is determined by the methoxy groups at the C-2 and C-3 positions of the quinone headgroup. Using photoactivatable quinone derivatives, it is demonstrated that ubiquinone-8 bound to NqrA occupies a functional site. A novel scheme of electron transfer in Na+-NQR is proposed that is initiated by NADH oxidation on subunit NqrF and leads to quinol formation on subunit NqrA. PMID:21885438

  5. Biofeasibility Study.

    ERIC Educational Resources Information Center

    Chaparian, Michael

    1995-01-01

    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)

  6. Sleep Studies

    MedlinePLUS

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

  7. Intelligence Studies

    ERIC Educational Resources Information Center

    Monaghan, Peter

    2009-01-01

    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…

  8. Is the pseudogap a topological state?

    NASA Astrophysics Data System (ADS)

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

    2015-02-01

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

  9. Sound Studies Meets Deaf Studies

    E-print Network

    Friedner, Michele Ilana

    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 ...

  10. 1 Peace Studies PEACE STUDIES

    E-print Network

    Vertes, Akos

    1 Peace Studies PEACE STUDIES The peace studies program encourages students to explore the multiple meanings of peace, the relationship between peace and conflict, and the role of peace on local and global levels. The program provides students the opportunity to examine peace in its philosophical and religious

  11. 1 Film Studies FILM STUDIES

    E-print Network

    Vertes, Akos

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

  12. Prayer Study

    NSDL National Science Digital Library

    Kathy Gallucci

    2004-02-01

    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.

  13. Social Studies.

    ERIC Educational Resources Information Center

    White, Cam, Ed.

    This document contains the following papers on social studies instruction and technology: (1) "Waking the Sleeping Giant: Social Studies Teacher Educators Collaborate To Integrate Technology into Methods' Courses" (Cheryl Mason, Marsha Alibrandi, Michael Berson, Kara Dawson, Rich Diem, Tony Dralle, David Hicks, Tim Keiper, and John Lee); (2)…

  14. 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.

  15. Women's Studies.

    ERIC Educational Resources Information Center

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

    1981-01-01

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

  16. Studying Zooarchaeology

    ERIC Educational Resources Information Center

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

    2012-01-01

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

  17. Environmental Study

    ERIC Educational Resources Information Center

    Literacy Discussion, 1970

    1970-01-01

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

  18. Cholera studies

    PubMed Central

    Pollitzer, R.

    1955-01-01

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

  19. Cholera studies

    PubMed Central

    Pollitzer, R.; Burrows, W.

    1955-01-01

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

  20. Cholera studies

    PubMed Central

    Pollitzer, R.

    1954-01-01

    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

  1. IMMUNOTOXICITY STUDIES

    EPA Science Inventory

    Few D/DBPs have been evaluated for effects on the immune system, but certain studies suggest that immunosuppression may follow exposure to D/DBPs. Suppressed immune function is associated with increased susceptibility to infectious disease and certain types of cancer in humans a...

  2. Research Study

    ERIC Educational Resources Information Center

    Glick, Ashley

    2010-01-01

    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;…

  3. Image restoration using fast Fourier and wavelet transforms

    NASA Astrophysics Data System (ADS)

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

    1994-02-01

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

  4. Narcotics and explosives detection by 14N pure nuclear quadrupole resonance

    NASA Astrophysics Data System (ADS)

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

    1994-03-01

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

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

    PubMed Central

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

    2013-01-01

    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

  6. Alternative pyrimidine biosynthesis protein ApbE is a flavin transferase catalyzing covalent attachment of FMN to a threonine residue in bacterial flavoproteins.

    PubMed

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

    2013-05-17

    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 Mg(2+)-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

  7. 14N nuclear quadrupole resonance study of phase transitions of 1M and 2Or polytypes of potassium hexacyanoferrate (III)

    NASA Astrophysics Data System (ADS)

    Murgich, Juan; Abanero, Jose A.; Santana R., Magaly; Capparelli, Mario V.

    1986-11-01

    14N nuclear quadrupole resonance (NQR) frequencies were measured between 77-328 K for simple monoclinic (1M) and orthorhombic (2Or) polytypes of potassium hexacyanoferrate (III) (KFR). A reversible first order transition was found at 133 K for 1M and at 138 K for 2Or polytype. The transition was interpreted in terms of the coupling of a quasisoft rotatory mode with a temperature dependent tilt motion of the complex ion. An irreversible interpolytype transition produced by internal strains was observed in a sample formed by 1M and 2Or polytypes and repeatedly cycled between around 80-140 K and room temperature. Selective broadening of lines observed in only a pair of N atoms of each hexacyanoferrate ion was attributed to the occurrence of one dimensional disorder of neighboring K ions. The disorder disappeared after sample recrystallization. It was found that low crystallization rates produced only the 1M structure while high rates increased the occurrence of the 2Or over 1M polytype and even produced a third polytype. Annealing of KFR for two weeks at 160 °C produced minor changes in polytypic composition thus showing a high energy barrier for interpolytypic conversion. The results obtained in KFR are explained in terms of the theory of order-disorder structures in layered compounds.

  8. ELLIPSE Study

    PubMed Central

    Dupuis-Girod, Sophie; Ambrun, Alexis; Decullier, Evelyne; Samson, Géraldine; Roux, Adeline; Fargeton, Anne-Emmanuelle; Rioufol, Catherine; Schwiertz, Verane; Disant, François; Chapuis, François; Donazzolo, Yves; Paintaud, Gilles; Edery, Patrick; Faure, Frederic

    2014-01-01

    Background: Hereditary hemorrhagic telangiectasia (HHT) is a dominantly inherited genetic vascular disorder in which epistaxis is the most frequent manifestation, responsible for high morbidity. Management of this symptom has no standard, and local treatments are often aggressive. Their efficacy is variable and has not been proven. Anti-angiogenic drugs, such as bevacizumab, are a new treatment strategy. Its systemic administration in patients with HHT improves liver damage-related symptoms and epistaxis. To limit the systemic adverse effects of bevacizumab and to ease administration, a local administration seems suitable. Primary objective: To evaluate the tolerance of increasing doses of bevacizumab administered as a nasal spray in patients with HHT-related epistaxis. Secondary objectives were to study the bioavailability and efficacy of bevacizumab against epistaxis when given as a nasal spray. Methodology: Phase 1, randomized, double-blind, placebo-controlled, monocentric study performed sequentially (dose escalation) on 5 groups of 8 patients. Each group was made up of 6 verum and 2 placebos. Five increasing doses of bevacizumab nasal spray (25 mg/mL) were evaluated: 12.5, 25, 50, 75 and 100 mg. Results: A total of 40 patients were included between October 2011 and October 2012. Bevacizumab nasal spray was well tolerated in all patients and the drug was not detected in their serum. No dose limiting toxicity was observed. No efficacy was observed at any dose in this study. Conclusion: Based on these results, bevacizumab nasal spray is a safe treatment of epistaxis in HHT. However, a randomized Phase 2 study is needed to determine its efficacy. Trial Registration: ClinicalTrials.gov Identifier #NCT01507480 PMID:24481211

  9. Cholera studies*

    PubMed Central

    Pollitzer, R.

    1956-01-01

    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

  10. Blastoid studies

    E-print Network

    Fay, R. O.

    1961-10-30

    Hydrospires 14 Genus Heteroblastus Etheridge & Carpenter, Hydrospire plate 14 1886 75 Fused hydrospire plate 15 Genus Lophoblastus Rowley, 1901 75 Hydrospire pores 15 Genus Mesoblastus Etheridge & Carpenter, Oral plates 15 1886 76 Anal plates... be revised, with emphasis placed upon internal, anal, and oral features. In the present work only 44 genera are studied (12 new; 3 Permian, 41 Mississippian and older) because of a time limit. These are arranged alphabetically under the orders Fissiculata...

  11. 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.

  12. Cholera studies*

    PubMed Central

    Swaroop, S.; Pollitzer, R.

    1955-01-01

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

  13. Cholera studies*

    PubMed Central

    Pollitzer, R.

    1957-01-01

    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

  14. Quaternary Studies

    NSDL National Science Digital Library

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

  15. Complementary Study

    NASA Astrophysics Data System (ADS)

    Yamada, H.

    2009-02-01

    In this lecture, it is emphasized that sufficient resolution of scientific issues for a fusion energy reactor can be given by complementary studies. Key scientific issues for a fusion energy reactor and ITER addressed by a complementary study in the Large Helical Device (LHD) are discussed. It should be noted that ITER is definitely a necessary condition but not a sufficient condition. Helical systems including stellarators and heliotrons are defined as alternative concepts. These approaches also aim at a fusion energy reactor based on their own concept and simultaneously benefit progress in tokamaks, more specifically ITER itself. The exact science to manage a 3-D geometry has been being developed in helical systems. A physical model with much accuracy and breadth will demonstrate its applicability to ITER. Topics to validate "complementary" approaches such as 3-D equilibrium, interchange MHD mode, control of radial electric field & structure formation, dynamics of a magnetic island, density limit and edge plasmas are discussed. Complementary is not Supplementary. ITER is complementary to development of a helical fusion energy reactor as well. Complementary approaches transcend existing disciplinary horizons and enable big challenges.

  16. Cholera studies*

    PubMed Central

    Pollitzer, R.

    1957-01-01

    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

  17. Plague studies*

    PubMed Central

    Pollitzer, R.

    1953-01-01

    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

  18. Systems Studies

    SciTech Connect

    Graham, R.L.

    1998-03-17

    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.

  19. Nuclear quadrupole resonance of barium in BaBiO3 and BaPbO3

    NASA Astrophysics Data System (ADS)

    Savosta, M. M.; Doroshev, V. D.; Borodin, V. A.; Pashkevich, Yu. G.; Kamenev, V. I.; Tarasenko, T. N.; Englich, J.; Kohout, J.; Soldatov, A. G.; Barilo, S. N.; Shiryaev, S. V.

    2001-05-01

    The nuclear quadrupole resonance (NQR) on Ba nuclei was studied in four samples of BaBiO3 prepared in different ways and, in addition, in BaPbO3. The spectrum of 137Ba at T=4.2 K consists of a relatively broad line centered near 18 MHz for all BaBiO3 samples and near 13 MHz for BaPbO3. The integrated intensity of the 137Ba resonance in the ceramic sample of BaBiO3 synthesized at 800 °C is approximately twice as large as that in ceramic samples and a single crystal prepared at 930-1080 °C. The decrease of the NQR signal can be attributed to the partial disordering of charge-disproportionated Bi ions on the two inequivalent sites. The broadening of the resonance indicates that local distortions of the crystal structure exist in both compounds. The point-charge model was used to analyze the electric-field gradient on the Ba sites.

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

    PubMed

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

    2013-01-01

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

  1. NMR reveals double occupancy of quinone-type ligands in the catalytic quinone binding site of the Na+-translocating NADH:Quinone oxidoreductase from Vibrio cholerae.

    PubMed

    Nedielkov, Ruslan; Steffen, Wojtek; Steuber, Julia; Möller, Heiko M

    2013-10-18

    The sodium ion-translocating NADH:quinone oxidoreductase (Na(+)-NQR) from the pathogen Vibrio cholerae exploits the free energy liberated during oxidation of NADH with ubiquinone to pump sodium ions across the cytoplasmic membrane. The Na(+)-NQR consists of four membrane-bound subunits NqrBCDE and the peripheral NqrF and NqrA subunits. NqrA binds ubiquinone-8 as well as quinones with shorter prenyl chains (ubiquinone-1 and ubiquinone-2). Here we show that the quinone derivative 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone (DBMIB), a known inhibitor of the bc1 and b6f complexes found in mitochondria and chloroplasts, also inhibits quinone reduction by the Na(+)-NQR in a mixed inhibition mode. Tryptophan fluorescence quenching and saturation transfer difference NMR experiments in the presence of Na(+)-NQR inhibitor (DBMIB or 2-n-heptyl-4-hydroxyquinoline N-oxide) indicate that two quinone analog ligands are bound simultaneously by the NqrA subunit with very similar interaction constants as observed with the holoenzyme complex. We conclude that the catalytic site of quinone reduction is located on NqrA. The two ligands bind to an extended binding pocket in direct vicinity to each other as demonstrated by interligand Overhauser effects between ubiquinone-1 and DBMIB or 2-n-heptyl-4-hydroxyquinoline N-oxide, respectively. We propose that a similar spatially close arrangement of the native quinone substrates is also operational in vivo, enhancing the catalytic efficiency during the final electron transfer steps in the Na(+)-NQR. PMID:24003222

  2. 160 East Asian Studies East asian studiEs (Eas)

    E-print Network

    Dresden, Gregory

    160 East Asian Studies East asian studiEs (Eas) CORE FaCuLtY: PROFESSORS O'MARA, SMITKA ASSOCIATE PROFESSORS LuBin, FU, IKEDA, UJIE ASSISTANT PROFESSORS BELLO, CHANG, ROBINSON The program in East Asian Studies is not a major. StudentsidentifiedbythechairoftheEastAsianStudies committee as having completed

  3. NMR studies of the internal electric field in a single crystal of the quasi-one-dimensional conductor Li0.9Mo6O17

    NASA Astrophysics Data System (ADS)

    Wu, Guoqing; Wu, Bing

    2015-03-01

    The quasi-one-dimensional (Q1D) conductor Li0.9Mo6O17 is of considerable interest because it has a highly conducting phase with properties likely associated with a Luttinger liquid, a poorly understood ``metal-insulator'' crossover at temperature TMI = 24 K, and a 3D superconducting phase that may involve triplet Cooper pairs at Tc = 2.2 K, while the mechanism for many of its properties has been a long mystery and it presents tremendous experimental challenges. We report the 7Li-NMR measurements of the internal electric field with an externally applied magnetic field B0 = 9 - 12 T, and we also show our theoretically calculated result of the electric field based on the structure of the crystal lattice. We find that the 7Li-NQR frequency (?Q) has a value of ~ 45 kHz and the electric field gradient (EFG) at the Li site due to the charges of the surrounding Mo conduction electrons has an axial symmetry with the principle axis (pz) to be along the lattice a-axis. There is no temperature or field dependence for the value of ?Q or EFG, indicating that the ``metal-insulator'' crossover has a magnetic origin, rather than the charge density wave (CDW) as one of the possible mechanisms previously thought in literature.

  4. Subfemtotesla radio-frequency atomic magnetometer for detection of nuclear quadrupole resonance

    E-print Network

    Romalis, Mike

    Hz 14 N NQR frequency of ammonium nitrate. A potential application of the magnetometer is detection-to-noise ratio SNR below a few megahertz. The NQR signal from 22 g of powdered ammonium nitrate located 2 cm away from the sensor is detected with a SNR of 9 in a 4.4-s-long multiple echo sequence, which represents

  5. Nondestructive testing of adhesive bonds by nuclear quadrupole resonance method

    NASA Technical Reports Server (NTRS)

    Hewitt, R. R.

    1971-01-01

    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.

  6. Fostering Effective Studying and Study Planning with Study Questions

    ERIC Educational Resources Information Center

    Wilhelm, Pascal; Pieters, Jules M.

    2007-01-01

    In a course on biological psychology and neuropsychology, study questions were provided that also appeared as test questions in the course exam. This method was introduced to support students in active processing and reproduction of the study texts, and study planning. Data were gathered to test the hypothesis that study question use would be…

  7. Studying For Exams SEVEN DAY STUDY GUIDE

    E-print Network

    Barrash, Warren

    Studying For Exams SEVEN DAY STUDY GUIDE Day One: ORGANIZE all your notes and materials from class. As you study, cross off items when you finish re- viewing them. Create your own exam questions emphasized in Text Only. Day Seven: Review All Locate weak areas. Include material not emphasized in either

  8. Paraguayan Education Study: A Pilot Study.

    ERIC Educational Resources Information Center

    Garcia, Patricia

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

  9. Front End StudiesFront End Studies--International Design StudyInternational Design Study

    E-print Network

    McDonald, Kirk

    1 Front End StudiesFront End Studies-- International Design StudyInternational Design Study Update developed during study 2A Concern on Vrf' as function of Bsol Need baseline design for IDS need baseline longer than nB = 10 optimize with lower fields · V'rf

  10. Front End StudiesFront End Studies--International Design StudyInternational Design Study

    E-print Network

    McDonald, Kirk

    1 Front End StudiesFront End Studies-- International Design StudyInternational Design Study Update/MC Concepts developed during study 2A Concern on Vrf' as function of Bsol Need baseline design for IDS need optimize with lower fields · V'rf

  11. Women's Studies (undergraduate)

    E-print Network

    Suzuki, Masatsugu

    348 Women's Studies (undergraduate) The Women's Studies Program offers an interdisciplinary course of study in the historical, economic, political, social and cultural experi- ence of women. The program courses in women's studies. Each semester the Women's Studies Department publishes a list of courses

  12. Optical and Nuclear Spin Spectroscopy in PRASEODYMIUM(3+):LANTHANUM Fluoride by Optical Pumping

    NASA Astrophysics Data System (ADS)

    Wald, Lawrence Leroy

    A Stark Modulated Optical Pumping (SMOP) technique was used as a sensitive probe of optical hole-burning to study the effects of nuclear spin interactions in Pr ^{3+}:LaF_3. The results of two experiments are reported. In the first experiment, the SMOP technique is applied for optical detection of the NQR spectrum of the Pr^{3+} optical ground state. Frequency and linewidth variations of the Pr ^{3+} ground state hyperfine levels for different positions within the main ^3 H_4(Gamma1) -^1D_2(Gamma 1) inhomogeneous optical line and satellite transitions of Pr^{3+}:LaF _3 are observed. A linear increase in the broadening of the Pr^{3+} hyperfine transitions, without a shift of central frequency, is measured as the laser is tuned toward the wings of the inhomogeneous optical transition. The linear variation is attributed to electric quadrupole broadening caused by changes in local density of point defects across the Stark broadened optical transition. The optically detected NQR spectra of the satellite transitions associated with Pr ion pairs are shifted in frequency, and for most satellites are narrower in width than the NQR spectra found in the wings of the main inhomogeneous optical line. In the second experiment, direct evidence for the presence of a spin diffusion barrier or "frozen core" in Pr^{3+}:LaF _3 is observed by examining the cross relaxation between the Pr and F nuclei in a magnetic field chosen so that a pair of the optical ground state Pr^ {3+} hyperfine energy levels matches the F splitting or a multiple of the F splitting. This level crossing condition allows resonant flip-flop interactions with the nearest neighbor frozen core fluorine spins to re-populate Pr^{3+} hyperfine levels emptied by laser hole-burning, and is detected as enhanced absorption of the laser beam. The coupling of core fluorine spins to bulk fluorine spins during Pr-F cross-relaxation is measured by NMR of the bulk fluorine spin magnetization. The rate of cross relaxation between the Pr spins and the bulk F spins measured in this way is at least three to four orders of magnitude slower than that expected in the absence of a spin diffusion barrier. This reduction of coupling indicates nearly complete de-tuning of the frozen core F spins immediately surrounding the Pr^{3+} ion, cutting off resonant coupling with the bulk F spins.

  13. 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

  14. CLASSICAL, MEDIEVAL RENAISSANCE STUDIES

    E-print Network

    Peak, Derek

    CLASSICAL, MEDIEVAL & RENAISSANCE STUDIES Programs & Classes 2014-2015 Student Advising Handbook & RENAISSANCE STUDIES Executive Committee: Director - B. Nelson (English), Student Rep. - K. Dase, P. Robinson), W. Kreyszig (Music), S. Spriet (Languages & Linguistics) Classical, Medieval and Renaissance Studies

  15. 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.

  16. Ethnographic Study: @ONE Technology Training Project Study.

    ERIC Educational Resources Information Center

    Obler, Susan; Schiorring, Eva

    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…

  17. Latin american and caribbean StudieS

    E-print Network

    Dresden, Gregory

    209 Latin american and caribbean StudieS (LacS) cOre FacuLtY: Professor barnett AssociAte Professor MAyock AssistAnt Professors BottA, cArey, Dickovick, eAstwooD the Program in Latin american and caribbean, culture, and society as applied to the region of Latin America and the caribbean. the program's curriculum

  18. 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

  19. Silent study zone Quiet study zone

    E-print Network

    Banaji,. Murad

    Archaeology 4E Architecture 3W Art 3W Assistive technology 2C Astronomy 2W B Borrower & Library account study spaces Quiet study spaces Music Classmark M Arts and Architecture Classmark N Politics Engineering & Technology Military & Naval Science Classmarks R S T U V Bibliography Classmark Z Sciences Maths

  20. Brazilian Sepsis Epidemiological Study (BASES study)

    Microsoft Academic Search

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

    2004-01-01

    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

  1. Urban Studies Certificate

    E-print Network

    Saldin, Dilano

    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

  2. Summer Studies CALENDAR 2010

    E-print Network

    Fabry, Frederic

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

  3. Advanced planetary studies

    NASA Technical Reports Server (NTRS)

    1978-01-01

    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.

  4. Hydropower Potential Screening Study

    E-print Network

    Hydropower Potential Screening Study Gillian Charles GRAC 5/28/14 #12;Latest Hydropower Potential Study Creating a Buzz 2014 DOE study on undeveloped stream reaches 84.7 GW undeveloped hydropower in undeveloped stream reaches hydropower in the PNW #12;Studies at both National

  5. Women's and Gender Studies

    E-print Network

    Dawson, Jeff W.

    Women's and Gender Studies #12;Women's and Gender Studies at Carleton University provides you and the world around us. The Pauline Jewett Institute of Women's and Gender Studies offers a stimulating affects our local, national and global environment. Women's and Gender Studies not only opens new

  6. WOMEN'S STUDIES CENTER APPLICATION

    E-print Network

    Fernandez, Eduardo

    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

  7. Certificate Program AFRICANA STUDIeS

    E-print Network

    Dennehy, John

    spectrum of disciplines including Anthropology, Art, English, Film Studies, History, Music, Political institutions. Among the research resources at their disposal are the New York Public Library, the Mina Rees

  8. The National Children's Study

    NSDL National Science Digital Library

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

  9. Oxygen dependence on superconducting properties of La 1.85Sr 0.15CuO 4- ? ceramic and crystal samples

    NASA Astrophysics Data System (ADS)

    Buffeteau, B.; Hargreaves, T.; Grevin, B.; Marin, C.

    1998-01-01

    We have produced LSCO ceramic samples by a sol-gel method, whose high quality is demonstrated by NQR and specific heat measurements. Many studies concerning the influence of phase purity, strontium homogeneity and oxygen stoichiometry on the superconducting properties of La 1.85Sr 0.15CuO 4- ? were carried out using X-ray diffraction, SQUID magnetization and specific heat measurements. The control of strontium and oxygen content achieved on ceramic samples gave us the opportunity to optimize our LSCO `crystal' grown by the travelling solvent floating zone method. Low-temperature specific heat measurements were also performed between 0.3 and 8 K on both La 1.85Sr 0.15CuO 4 ceramic and `crystal' samples in the T-range 0.3-8 K and the results revealed that the specific heat residuals of our samples were lower than those already measured and published by other groups.

  10. Calculation of the nuclear quadrupole resonance spectra of YBa/sub 2/Cu/sub 3/O/sub 7/minus/x/

    SciTech Connect

    Winter, N.W.; Violet, C.E.

    1989-06-01

    Nuclear quadrupole resonance (NQR) and nuclear magnetic resonance (NMR) studies on /sup 63,65/Cu have demonstrated the the resonance properties of these nuclei can give important information about the electronic structure of the high temperature superconductor YBa/sub 2/Cu/sub 3/O/sub 7/minus/x/ as well as the exchange coupling energy between the Cu(2) sites. Measurements for various oxygen stoichiometries have given insight into the effect of oxygen content on the valence state of the Cu. In the work reported here, the electric field gradient (EFG) tensors at the Cu(1) and Cu(2) sites in YBa/sub 2/Cu/sub 3/O/sub 7/minus/x/, have been determined from calculations on large clusters for x = 0 and 1. 13 refs., 2 tabs.

  11. Case study research.

    PubMed

    Taylor, Ruth; Thomas-Gregory, Annette

    2015-06-10

    This article describes case study research for nursing and healthcare practice. Case study research offers the researcher an approach by which a phenomenon can be investigated from multiple perspectives within a bounded context, allowing the researcher to provide a 'thick' description of the phenomenon. Although case study research is a flexible approach for the investigation of complex nursing and healthcare issues, it has methodological challenges, often associated with the multiple methods used in individual studies. These are explored through examples of case study research carried out in practice and education settings. An overview of what constitutes 'good' case study research is proposed. PMID:26058651

  12. Lewisville Neighborhood Development Study 

    E-print Network

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

    2006-01-01

    A neighborhood revitalization study of the Fox Avenue corridor in Lewisville was conducted. This corridor neighborhood study area is bounded by Main Street on the north, IH-35E on the east, Bellaire on the south and Old ...

  13. Working and Studying Abroad

    E-print Network

    their studies, and any student or graduate looking to explore career opportunities in a new country. It contains web sites: http://europa.eu information on living, working and studying in the EU. Includes links

  14. 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 ...

  15. Studies That Observe Humans

    MedlinePLUS

    ... Topic Human testing: Clinical trials Studies that observe humans A study that simply looks at people is ... in the past without counting on a person’s memory. And there’s no way to find out what ...

  16. COAST Arbeitspapier Study Programme

    E-print Network

    Damm, Werner

    general overview of careers in the field of Sustainability. Inhalt A. BackgroundDatum: Autoren: COAST Arbeitspapier 004 Study Programme Sustainable Development A Cross Programme Sustainable Development 1 Study Programme Sustainable Development A Cross-Cutting agenda

  17. Studies on Aleurodidae 

    E-print Network

    Deshpande, V. G.

    1931-01-01

    There are some references on the study of morphology of the Homoptera in which Cicada has been taken as a basis for the generalised structure. In the sub-order Sternorhyncha paylla has been studied, but there are hardly ...

  18. LISA mission study overview

    Microsoft Academic Search

    A. Hammesfahr

    2001-01-01

    The European Space Agency placed in mid-1999 a contract with the Dornier Satellitensysteme GmbH (now Astrium GmbH) for a study of the LISA mission and spacecraft design. The study was to start with a review of the concept developed by the LISA scientific study team as documented in their 1998 study report. This baseline was then modified where appropriate and

  19. Case Study: Ellen's Choice

    NSDL National Science Digital Library

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

    2001-04-03

    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.

  20. Case Study: Shark Attack

    NSDL National Science Digital Library

    Herbert House (Elon University Biology)

    2002-05-24

    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.

  1. The case study approach

    Microsoft Academic Search

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

    2011-01-01

    The case study approach allows in-depth, multi-faceted explorations of complex issues in their real-life settings. The value\\u000a of the case study approach is well recognised in the fields of business, law and policy, but somewhat less so in health services\\u000a research. Based on our experiences of conducting several health-related case studies, we reflect on the different types of\\u000a case study

  2. Case Study: Missing Link

    NSDL National Science Digital Library

    Elizabeth Strasser (Sacramento State Anthropology)

    2000-09-02

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

  3. Studying to Learn.

    ERIC Educational Resources Information Center

    Air Univ., Maxwell AFB, AL.

    This booklet was prepared in response to a demand from Air Force Officers returning to academic study after being out of school for several years. Its main purpose is to help returning veterans learn how to study. The guide is divided into three sections: (1) the "Reconnaissance-Read-Recall" (RRR) system of study, (2) concepts in "How We Learn,"…

  4. Renewable Electricity Futures Study

    E-print Network

    Renewable Electricity Futures Study Exploration of High-Penetration Renewable Electricity Futures PDF Volume 4 PDF #12;Renewable Electricity Futures Study Edited By Hand, M.M. National Renewable Citations Renewable Electricity Futures Study (Entire Report) National Renewable Energy Laboratory. (2012

  5. Laboratory plasma studies

    NASA Astrophysics Data System (ADS)

    Fliflet, Arne

    1993-11-01

    The contents of the document are as follows: NIKE KrF Laser Support; Microwave and Millimeter Wave Experiments; Studies of Novel Accelerator Concepts and Free Electron Lasers; Studies for the Modified Betatron Accelerator (MBA); PHAROS 3 Studies; Electron Beam Diagnostics; Microwave Energy Deposition in the Upper Atmosphere; and Visualization Tools and Parallel Processing for Physics Applications.

  6. Regional Transportation Coordination Study 

    E-print Network

    Golden Crescent Regional Planning Commission

    2006-01-01

    Golden Crescent Regional Transit i Regional Transportation Coordination Study: 7-County Golden Crescent Region Regional Transportation Coordination Study Executive Summary Chapter 1... ......................................................................................... 4-4 Golden Crescent Regional Transit ii Regional Transportation Coordination Study: 7-County Golden Crescent Region Chapter 5 - Identified Pilot Project Opportunities Background...

  7. Effective Elementary Social Studies.

    ERIC Educational Resources Information Center

    Hoge, John Douglas

    This book advocates providing high-quality K-6 social studies instruction. The text provides practical information on how teachers can conduct high-quality social studies programs in their classrooms. The volume is divided into three parts. Part 1 offers an overview of the formal and informal social studies curriculum, its history, current status,…

  8. Francophone Studies Certificate

    E-print Network

    Saldin, Dilano

    Study French Culture? As a political and business superpower on the world stage, France has long been program have an international focus valuable to a variety of careers in international business, government and Francophone Studies promotes an interdisciplinary approach to studying the French culture. It clusters courses

  9. Rural Policy Studies Skills.

    ERIC Educational Resources Information Center

    Fleury, Stephen C.; Mallan, John T.

    1988-01-01

    Describes a program for training high school social studies teachers to teach students to identify and systematically study rural policy issues affecting local economic and social development. Examines the relationships among policy studies, public education, and rural community development that make the proposed program particularly effective.…

  10. LITEE Case Studies

    NSDL National Science Digital Library

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

  11. Redefining Case Study

    Microsoft Academic Search

    Rob VanWynsberghe; Samia Khan

    In this paper the authors propose a more precise and encompass- ing definition of case study than is usually found. They support their defini- tion by clarifying that case study is neither a method nor a methodology nor a research design as suggested by others. They use a case study prototype of their own design to propose common properties of

  12. Social Psychoanalytic Disability Studies

    ERIC Educational Resources Information Center

    Goodley, Dan

    2011-01-01

    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…

  13. Women's Studies Scholarships

    E-print Network

    Almor, Amit

    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

  14. Women's Studies Intellectually stimulating,

    E-print Network

    Women's Studies Intellectually stimulating, personally fulfilling, and more practical than you might think. The breadth and depth of Women's Studies will amaze you. Our goal is to help you "find your choose Women's Studies on its own or in conjunction with another program, the skills and knowledge you

  15. 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...

  16. ACCELERATOR RESEARCH STUDIES

    SciTech Connect

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

    2004-01-23

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

  17. Qualitative Studies: Historiographical Antecedents.

    ERIC Educational Resources Information Center

    Mills, Rilla Dean

    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…

  18. Habitat Study. Transect Study. [Environmental Education Units.

    ERIC Educational Resources Information Center

    Minneapolis Independent School District 275, Minn.

    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.…

  19. Southeastern Cancer Study Group: breast cancer studies

    SciTech Connect

    Smalley, R.V.; Bartolucci, A.A.; Moore, M.

    1983-12-01

    During the past 10 years, the Southeastern Cancer Study Group (SECSG) has been engaged in one major adjuvant study and three major advanced disease studies for patients with adenocarcinoma of the breast. The adjuvant study is demonstrating that six months of adjuvant CMF is the therapeutic equivalent of 12 months and that post-operative irradiation is of no added therapeutic benefit. In patients with advanced disease, a low dose 5 drug combination of CMFVP induces more objective responses than single agent 5FU, but improves survival only for those patients with liver metastases when compared to the sequential use of the same 5 single agents. The three drug combination, CAF, utilizing doxorubicin, induces more objective responses than low dose CMFVP, but it does not improve overall survival. The addition of a phase active combination, CAMELEON, (i.e., sequentially alternating therapy) of CAF has not improved the duration of disease control and survival for patients with liver metastases, lymphangitic and nodular lung metastases compared to CAF. Aggressive combination chemotherapeutic approaches to patients with advanced disease provide better and longer disease and tumor control but only marginal improvements in overall survival. Adding additional agents to a maximally tolerable regimen has not improved the therapeutic outcome.

  20. Hydropower Potential Studies Reviewed for Scoping Study

    E-print Network

    Feasibility Study on Five Potential Hydroelectric Power Generation Locations, North Unit Irrigation District B/ENERGY STORAGE PROJECTS C1 Assessment of Opportunities for New US Pumped Storage Hydroelectric Plants Using Hydroelectric Pumped Storage for Enabling Variable Energy Resources within the FCRPS C4 Technical Analysis

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

    E-print Network

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

  2. Advanced Clothing Studies

    NASA Technical Reports Server (NTRS)

    Orndoff, Evelyne; Poritz, Darwin

    2014-01-01

    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.

  3. Étude par résonance quadrupolaire nucléaire de la rétention de carbone dans l'{YBa_2Cu_3O_{{y}? 7}}

    NASA Astrophysics Data System (ADS)

    Grévin, B.; Berthiercw, Y.; Monot, I.; Wang, J.; Weiss, F.

    1998-03-01

    We present a Nuclear Quadrupole Resonance (NQR) study of Cu(2) (planes) and Cu(1) (chains) sites in two YBa_2Cu_3O_{{y}? 7} powder samples with carbon concentration equal to 500 ppm and 3000 ppm, and in a free-carbon sample. By comparison with standard spectra in YBa_2Cu_3Oy, we show that a new NQR line appears at 30.90 MHz, the intensity of which is strongly correlated with the amount of carbon in the sample. Moreover, according to the spin-lattice relaxation rate 1/T_1 measurements at different frequencies of the spectrum, we attribute this anomalous line to the formation of clusters in which the superconductivity is destroyed by the presence of carbonate groups, which substitute preferentially for copper chain site. Those results are in good agreement with those of Wang et al. [CITE], obtained by high resolution electron microscopy. Nous présentons une étude par Résonance Quadrupolaire Nucléaire (RQN) des sites Cu(2) (plans) et Cu(1) (chaînes) dans deux échantillons de poudre d'YBa_2Cu_3O_{{y}? 7} contenant 500 ppm et 3000 ppm de carbone, ainsi que dans un échantillon de poudre supposé ne pas contenir de carbone. Par comparaison avec les spectres traditionnellement obtenus dans l'YBa_2Cu_3O_{{y}? 7}, nous avons mis en évidence l'apparition d'une raie supplémentaire à 30,90 MHz dont l'intensité augmente sensiblement avec le taux de carbone. De plus, l'analyse du taux de relaxation spin-réseau 1/T_1 mesuré à différentes fréquences nous a permis d'attribuer l'origine de cette raie anormale à la formation de domaines ou la supraconductivité est détruite par la présence de carbonates localisés de manière préférentielle sur les sites des chaînes. Cette étude confirme les résultats de Wang et al. [CITE] obtenus en microscopie électronique à haute résolution.

  4. Teleoperator Human Factors Study

    NASA Technical Reports Server (NTRS)

    1986-01-01

    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.

  5. 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

  6. 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.

  7. 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.

  8. Division of Continuing Studies

    E-print Network

    Sheridan, Jennifer

    ,000... ...in scholarships and grants awarded through Continuing Studies 12 languages... ...taught by Continuing Serves a Range of Nontraditional Students Adult student scholarships--administered by the division

  9. Communications systems checkout study

    NASA Technical Reports Server (NTRS)

    Ginter, W. G.

    1972-01-01

    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.

  10. Future Spacelift Requirements Study

    NASA Technical Reports Server (NTRS)

    1997-01-01

    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.

  11. 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.

  12. Case Study: Football Fanaticism

    NSDL National Science Digital Library

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

    2003-07-03

    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.

  13. Measuring Study Effectiveness

    NSDL National Science Digital Library

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

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

  14. Energy conversion alternatives study

    NASA Technical Reports Server (NTRS)

    Shure, L. T.

    1979-01-01

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

  15. Fluctuation studies in STAR

    E-print Network

    Supriya Das

    2006-12-08

    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.

  16. Afro-Latin Studies

    Microsoft Academic Search

    Peter Wade

    2006-01-01

    The state of Afro-Latin studies is reviewed, starting with questions about terminology and racial classification, then exploring issues of racism and the relation between race and class. The impact of black (and indigenous) social movements on the field of study is then examined and this raises the question of how ideologies and practices of mestizaje have changed in the wake

  17. The Study of Teaching.

    ERIC Educational Resources Information Center

    Corrigan, Dean, Ed.

    This publication represents four years of work by the Commission on Implications of Recent Research on Teaching. An article by Henry Hermanowicz, "Studies of Teaching and Their Impact on Future Developments in Teacher Education," (ED 024 624) reviews recent critical examinations of teacher education, new developments in the systematic study of…

  18. Morphological studies on neuroglia

    Microsoft Academic Search

    Y. Murabe; Y. Sano

    1981-01-01

    The silver-impregnation procedure of Tsujiyama is suitable for demonstration of all three classical types of neuroglial cells; in the present study it was used for electron microscopic identification of neuroglial cells in the brain of the cat. The aim of the present study was 1) to determine impregnated structural correlates of neuroglial cells at the light- and electron-microscopic levels, and

  19. Qualitative Studies in HRD.

    ERIC Educational Resources Information Center

    1999

    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…

  20. Spacing Studies in Peppers

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Higher plant stand densities usually result in greater pepper fruit yields. While the impact of stand density on yield has been studied for bell and non-bell peppers, but very little information exists regarding implications on pesticide efficacy. The objective of these studies was to determine th...

  1. Options Study - Phase II

    Microsoft Academic Search

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

    2010-01-01

    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

  2. Interagency Depainting Study Status

    NASA Technical Reports Server (NTRS)

    Clark-Ingram, Marceia; Cook, Beth

    1999-01-01

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

  3. Black Studies Revisited.

    ERIC Educational Resources Information Center

    Bunzel, John H.; Grossman, Anita Susan

    1997-01-01

    Presents abridged versions of material which examines black studies at San Francisco State University that was conducted to determine the ideas promoted by the department and the academic quality of the instruction provided. Discusses the psychology and vocabulary of black studies, its literature, and its portrayal of American life and white…

  4. MIXTURES FEASIBILITY STUDY

    EPA Science Inventory

    A number of studies have been conducted to address questions concerning the toxicity of "real world" mixtures of DBPs. These studies, which used either concentrates of drinking water or humic acid preparations treated with various disinfectants, were largely negative and had a nu...

  5. INTERDISCIPLINARY AND LIBERAL STUDIES

    E-print Network

    of Arts/Bachelor of Science in Social Science Bachelor of Arts/Bachelor of Science in Liberal Studies ese planning to continue on to the Graduate Teacher Education Program, the Arts & Letters major allows minor course work may be used in the Arts & Letters major. Major Requirements for Liberal Studies: e

  6. Case study evaluation.

    PubMed Central

    Keen, J.; Packwood, T.

    1995-01-01

    Case study evaluations, using one or more qualitative methods, have been used to investigate important practical and policy questions in health care. This paper describes the features of a well designed case study and gives examples showing how qualitative methods are used in evaluations of health services and health policy. Images p446-a PMID:7640596

  7. KET Social Studies Posters

    NSDL National Science Digital Library

    2012-01-30

    The KET Social Studies posters provide an overview of the five “big ideas” that make up Kentucky’s K-12 social studies curriculum. These posters are appropriate for classroom display for both student and teacher reference. Each poster is available in two sizes and may be printed in color or black and white.

  8. Theorizing Iberian Studies

    ERIC Educational Resources Information Center

    Newcomb, Robert Patrick

    2015-01-01

    A growing number of scholars invested in Iberian Studies are asking how peninsular literary and cultural studies might be reimagined, and reinvigorated, by placing the Spanish and Portuguese canons into critical dialogue with each other, and with Galician, Catalan, Basque/Euskadi, and Latin American and North African immigrant writers, cultural…

  9. Lesson Study: Beyond Coaching

    ERIC Educational Resources Information Center

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

    2011-01-01

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

  10. Five year spinning study

    Technology Transfer Automated Retrieval System (TEKTRAN)

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

  11. Destination: Lesotho. Study Guide.

    ERIC Educational Resources Information Center

    Sheffield, Elise Sprunt

    This study guide was developed for teachers and students participating in the Peace Corps World Wise Schools program. The primary purpose of the study guide series is to enhance each class's correspondence with its Peace Corps Volunteer and to help students gain a greater understanding of regions and cultures different from their own. The specific…

  12. Distance Learning Case Studies.

    ERIC Educational Resources Information Center

    Barker, Bruce O.

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

  13. Study Skills Managing workload

    E-print Network

    Ainsworth, Mark

    Study Skills Managing workload A useful study skills guide, with advice on how to manage workload, and for reports, it is helpful both to you and to the reader if you provide headings for each of the main sections/or lists of references should be given at the end of the assignment. You should also incorporate page

  14. Study Skills and Learning.

    ERIC Educational Resources Information Center

    Marton, Ference; Svensson, Lennart

    1976-01-01

    The series of research studies contained in this project emphasize the central position of the learning process in research into teaching. The main studies under the project were based on four sets of material collected in the course of three academic years. A number of supplementary collections and processings of other material were also…

  15. Home Study Advertising Handbook.

    ERIC Educational Resources Information Center

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

    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);…

  16. SETDA Case Studies 2012

    ERIC Educational Resources Information Center

    State Educational Technology Directors Association, 2012

    2012-01-01

    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…

  17. Lewisville Neighborhood Development Study

    E-print Network

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

    2006-01-01

    A neighborhood revitalization study of the Fox Avenue corridor in Lewisville was conducted. This corridor neighborhood study area is bounded by Main Street on the north, IH-35E on the east, Bellaire on the south and Old Orchard on the west, with Fox...

  18. Nuclear medicine case studies

    SciTech Connect

    Wagner, H.N. Jr.

    1986-01-01

    This text presents case studies in nuclear medicine which emphasize the diagnosis of the patient's problem rather than the technical performance of the procedure. The book is arranged by organ systems and each section begins with a description of the technique and findings in a normal study.

  19. Studies of Supervisory Behavior.

    ERIC Educational Resources Information Center

    Sistrunk, Walter E.

    A series of supervisory behavior studies that began at Mississippi State University in 1980 are summarized. The studies were instigated because of interest in effective supervision and dissatisfaction with an indepth literature search of supervision literature. The theories disclosed were fragmentary, contradictory, and impractical for use by…

  20. studies CP2001 Constraints

    E-print Network

    Rossi, Francesca

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

  1. Comparative Ethnic Studies

    E-print Network

    Collins, Gary S.

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

  2. Asian Studies Certificate

    E-print Network

    Saldin, Dilano

    , global studies, international studies, journalism and advertising, the visual and performing arts, communication, economics, the natural sciences, political science, or any career path that may involve Societies through Film (3 credits) · CompLit 230 ­ Literature & Society: Chinese Literature Before the 20th

  3. Decontamination solution development studies

    Microsoft Academic Search

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

    1993-01-01

    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

  4. Cuban Studies Newsletter.

    ERIC Educational Resources Information Center

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

    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…

  5. Interdisciplinary study program

    E-print Network

    ?umer, Slobodan

    is devoted to train- ing in theoretical foundations of computer science and the related modern branches75 Interdisciplinary academic study program computer science and mathematics mc #12;76 #12;· Study title: Bachelor Engineer in Computer Science and Mathematics (academic) In Slovenian: diplomirani

  6. 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.

  7. The two-frequency nuclear quadrupole resonance for explosives detection

    Microsoft Academic Search

    G. V. Mozjoukhine

    2000-01-01

    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

  8. Off-resonance effects and selectivity profiles in pulsed nitrogen-14 nuclear quadrupole resonance.

    PubMed

    Guendouz, L; Robert, A; Retournard, A; Leclerc, S; Aissani, S; Canet, D

    2012-01-01

    In order to alleviate base-line distortions in nitrogen-14 NQR spectra originating from pulse breakthrough, low power radio-frequency (rf) pulses were applied. It is recalled that the required power is four times lower than that for an equivalent NMR experiment. This is easily explained by the fact that, in NMR, half the amplitude of the rf field is active. Moreover, the selectivity profile (i.e. the peak amplitude as a function of the difference between the carrier frequency and the resonance frequency) exhibits a shape which is, in most cases, more favorable in NQR than in NMR. An appropriate theory has been developed for explaining these experimental observations. It is concluded that low power NQR is perfectly feasible and should even be recommended for most applications, provided that the line-width of the NQR signal is not too large. PMID:23063174

  9. Spin dynamics in CuO and Cu[sub 1[minus][ital x

    SciTech Connect

    Carretta, P.; Corti, M.; Rigamonti, A. (Department of Physics Alessandro Volta,'' University of Pavia, Via Bassi 6, 27100 Pavia (Italy))

    1993-08-01

    [sup 63]Cu nuclear quadrupole resonance (NQR), nuclear antiferromagnetic resonance (AFNMR), and spin-lattice relaxation, as well as [sup 7]Li NMR and relaxation measurements in CuO and in Cu[sub 1[minus][ital x

  10. Quadrupole parameters of 11B in crystalline CaO.B2O3.

    PubMed

    Mao, D; Bray, P J

    1992-12-01

    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

  11. Nuclear quadrupole resonance lineshape analysis for different motional models: stochastic Liouville approach.

    PubMed

    Kruk, D; Earle, K A; Mielczarek, A; Kubica, A; Milewska, A; Moscicki, J

    2011-12-14

    A general theory of lineshapes in nuclear quadrupole resonance (NQR), based on the stochastic Liouville equation, is presented. The description is valid for arbitrary motional conditions (particularly beyond the valid range of perturbation approaches) and interaction strengths. It can be applied to the computation of NQR spectra for any spin quantum number and for any applied magnetic field. The treatment presented here is an adaptation of the "Swedish slow motion theory," [T. Nilsson and J. Kowalewski, J. Magn. Reson. 146, 345 (2000)] originally formulated for paramagnetic systems, to NQR spectral analysis. The description is formulated for simple (Brownian) diffusion, free diffusion, and jump diffusion models. The two latter models account for molecular cooperativity effects in dense systems (such as liquids of high viscosity or molecular glasses). The sensitivity of NQR slow motion spectra to the mechanism of the motional processes modulating the nuclear quadrupole interaction is discussed. PMID:22168707

  12. Decontamination solution development studies

    SciTech Connect

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

    1993-09-01

    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.

  13. Accelerator research studies

    SciTech Connect

    Not Available

    1993-01-01

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

  14. Methods of Studying Persons.

    ERIC Educational Resources Information Center

    Heinemann, Allen W.; Shontz, Franklin C.

    1985-01-01

    Describes a method that permits answering research questions of general importance by examining individuals in a comprehensive, whole-person manner. Discusses their use in two studies of persons with spinal cord injuries. (LLL)

  15. Rotorcraft convertible engine study

    NASA Technical Reports Server (NTRS)

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

    1982-01-01

    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.

  16. 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, ...

  17. IRD dropout study

    NASA Technical Reports Server (NTRS)

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

    1992-01-01

    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.

  18. Applied Research Study

    NASA Technical Reports Server (NTRS)

    Leach, Ronald J.

    1997-01-01

    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.

  19. Advanced planetary studies

    NASA Technical Reports Server (NTRS)

    1975-01-01

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

  20. Medicine and health studies

    E-print Network

    Sussex, University of

    Medicine and health studies Key facts · The excellent reputation of Sussex in research related to medicine has been enhanced by the opening of BSMS ten years ago. Working with partners such as the Genome

  1. Operator Certification Study Guide.

    ERIC Educational Resources Information Center

    American Water Works Association, Denver, CO.

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

  2. STUDY ABROAD SCHOLARSHIPS

    E-print Network

    Illinois at Chicago, University of

    describing your motivation for international study and an explanation of financial need (if wishing State Zip Class Standing: Freshman _____ Sophomore ______ Junior ______ Senior ______ Cumulative UIC GPA: _________ Most recent semester UIC GPA: ___________ UIC Credit Hours: ________ Did you submit a FAFSA

  3. Sturgeon study - specimens needed

    SciTech Connect

    Snyder, D.E.; Matthews, R.A.

    1983-01-01

    Preliminary results of a study to determine morphological criteria and verify those already suggested in the published literature for identifying the larvae of the Atlantic sturgeon and the endangered short nose sturgeon are presented. (ACR)

  4. Studies of talent markets

    E-print Network

    Terviö, Marko

    2003-01-01

    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 ...

  5. study abroad Katherine Wegman

    E-print Network

    Portman, Douglas

    Nagoya, Tokyo Jordan Amman Morocco Rabat Netherlands Amsterdam New Zealand Auckland, Christchurch Peru in Russia: St. Petersburg Spanish in Spain: Granada Mimi Kothor Morocco #12;Facts About Study Abroad

  6. Building an Integrated Study

    ERIC Educational Resources Information Center

    Collins, Myrtle T.; Greenberg, Marvin

    1974-01-01

    Article described a plan to develop integrated study through music activities. Students learned to become more independent learners while concentrating on more complex and creative activities. (Author/RK)

  7. 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...

  8. IRD dropout study

    NASA Astrophysics Data System (ADS)

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

    1992-08-01

    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.

  9. 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.

  10. Political Studies Review

    NSDL National Science Digital Library

    Festenstein, Matthew

    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.

  11. Graduate Studies Environmental Engineering

    E-print Network

    Jacobs, Laurence J.

    Graduate Studies Environmental Engineering ENVIRONMENTAL ENGINEERING (EnvE) The Georgia Institute and engineering. The principal focus areas include: environmental biotechnology; water quality and treatment Engineering are housed in the Environmental Science & Technology (ES&T), Daniel Labora- tory (DEEL

  12. Current Research Studies

    MedlinePLUS

    ... generation of massively parallel DNA sequencers and sophisticated computational methods, the initiative studies the complex role that ... online. Learn more about CCFA Partners. CCFA Clinical Research Alliance The Clinical Research Alliance is a network ...

  13. Habitability study shuttle orbiter

    NASA Technical Reports Server (NTRS)

    1972-01-01

    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.

  14. Graduate Studies Construction Engineering

    E-print Network

    Jacobs, Laurence J.

    Graduate Studies Construction Engineering CONSTRUCTION ENGINEERING The construction engineering, faculty, and staff across campus and a strong research program in Construction Engineering and Management funded by the National Science Foundation (NSF), Construction Industry Institute (CII), Georgia

  15. Participate in a Study

    MedlinePLUS

    ... the participants to make an informed decision. The Marfan Foundation requires that a study have IRB approval before we tell the Marfan syndrome and related disorders community about it. Before ...

  16. The Chernobyl Accident: Studies

    Cancer.gov

    The REB dosimetrists also collaborated with the International Agency for Research on Cancer (IARC) to develop common methods of dose estimation for the Chernobyl studies and were actively involved in the activities of the United Nations Chernobyl Forum.

  17. Earth study from space

    NASA Technical Reports Server (NTRS)

    Sidorenko, A. V.

    1981-01-01

    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.

  18. Tethered gravity laboratories study

    NASA Technical Reports Server (NTRS)

    Lucchetti, F.

    1989-01-01

    Tethered gravity laboratories study is presented. The following subject areas are covered: variable gravity laboratory; attitude tether stabilizer; configuration analysis (AIT); dynamic analysis (SAO); and work planned for the next reporting period.

  19. Online Study Guides

    NSDL National Science Digital Library

    Brians, Paul.

    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.

  20. Graduate Studies Structural Engineering,

    E-print Network

    Jacobs, Laurence J.

    · Structural Reliability SELECTED COURSES · Advanced Applied Mathematics · in Engineering · Advanced Dynamics aspects of modern structural engineering and structural mechanics and materials research. SomeGraduate Studies Structural Engineering, Mechanics, and Materials STRUCTURAL ENGINEERING, MECHANICS

  1. Graduate Studies Geosystems Engineering

    E-print Network

    Jacobs, Laurence J.

    in geo-based engineering fields. Geosystems engineering, includes geotechnics, geomechanics, geomaterials and Fracture Mechanics Laboratory · GeoQuake Simulations Laboratory In addition, the geosystems engineeringGraduate Studies Geosystems Engineering GEOSYSTEMS ENGINEERING Geosystems engineering

  2. Geosystems Engineering GRADUATE STUDIES

    E-print Network

    Wang, Yuhang

    Geosystems Engineering GRADUATE STUDIES GEOSYSTEMS ENGINEERING combines geotechnics, geomaterials, geo- physics, geochemistry, geomechanics, and geology with the focus on the behavior of natural materials in engineered systems. The Geosystems Engineering program at Georgia Institute of Technology

  3. Teleoperator human factors study

    NASA Technical Reports Server (NTRS)

    1984-01-01

    The progress made on the Teleoperator Human Factors Study program is summarized. Technical and programmatic problems that were encountered were discussed along with planned activities. The report contains four sections: Work Performed, Future Work, Problems Encountered, and Cost Information

  4. Teleoperator human factors study

    NASA Technical Reports Server (NTRS)

    1984-01-01

    The progress made on the Teleoperator Human Factors Study program is summarized. Technical and programmatic problems that were encountered are discussed along with planned activity. Work performed, future work, problems encountered, and cost information comprise the topics addressed herein.

  5. 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

  6. PSSC's Science Study Series

    NASA Astrophysics Data System (ADS)

    Whitaker, Robert J.

    1998-11-01

    Early in 1957, a report was published describing the formation of the "Physical Science Study Committee" (PSSC) the previous December and its proposed December and its proposed new physics program for secondary schools.

  7. PSSC's Science Study Series

    Microsoft Academic Search

    Robert J. Whitaker

    1998-01-01

    Early in 1957, a report was published describing the formation of the ``Physical Science Study Committee'' (PSSC) the previous December and its proposed December and its proposed new physics program for secondary schools.

  8. The Agricultural Health Study.

    PubMed Central

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

    1996-01-01

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

  9. Regional Transportation Coordination Study

    E-print Network

    Golden Crescent Regional Planning Commission

    ? Regional Assessment and Needs Chapter 3 ? Peer Review Chapter 4 ? Barriers and Constraints Chapter 5 ? Pilot Projects Chapter 6 ? RTA and Funding Options Golden Crescent Regional Transit 1-10 Regional Transportation Coordination Study... ? Regional Assessment and Needs Chapter 3 ? Peer Review Chapter 4 ? Barriers and Constraints Chapter 5 ? Pilot Projects Chapter 6 ? RTA and Funding Options Golden Crescent Regional Transit 1-10 Regional Transportation Coordination Study...

  10. Pharmacokinetic study of stobadine.

    PubMed

    Bezek, S; Soltés, L; Scasnár, V; Bauerová, K; Kállay, Z; Durisová, M; Mihalová, D; Bohov, P; Faberová, V; Kukan, M; Trnovec, T; Koprda, V

    1999-01-01

    The aim of this paper is to provide a brief overview of most important results of stobadine kinetic studies in rats, dogs, and human volunteers. In these studies, stobadine dihydrochloride and stobadine dipalmitate was used for intravenous and oral administration, respectively. To evaluate kinetic properties of stobadine and its metabolites, TLC, HPLC, GLC, GC-MS, radiometric, and fluorometric methods were developed and used. PMID:10576455

  11. Studies on Complement

    E-print Network

    Sherwood, Noble P.

    1921-01-01

    KU ScholarWorks | The University of Kansas Pre-1923 Dissertations and Theses Collection Studies on Complement 1921 by Noble P. Sherwood This work was digitized by the Scholarly Communications program staff in the KU Libraries’ Center for Digital... Scholarship. http://kuscholarworks.ku.edu Submitted to the Graduate Faculty and the Board of Administration of the University of Kansas in Partial Fulfiliment of the Requirements for the Degree of Doctor of Philosophy. w r* L I J STUDIES OH COMPLEMENT...

  12. Background Studies for EXIST

    NASA Technical Reports Server (NTRS)

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

    2004-01-01

    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.

  13. IGCC system studies

    SciTech Connect

    Rath, L.K.

    1994-10-01

    Systems studies are performed on both the currently available, but not fully demonstrated, integrated gasification combined-cycle (IGCC) technologies and the future technologies. The objective of these studies is to support and guide the Morgantown Energy Technology Center`s METC Strategic Product Planning efforts. Through these efforts, the research, development and demonstration needs of various alternative gasification and power island components can be quantified and factored into the overall planning processes.

  14. Banner Ad Placement Study

    NSDL National Science Digital Library

    Doyle, Kim.

    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.

  15. Congress initiates science study

    Microsoft Academic Search

    Randy Showstack

    1997-01-01

    The U.S. House of Representatives announced in October a year-long study to review the nation's science and technology policy and the government's role in funding scientific research. The Science Policy Study, led by Rep. Vernon Ehlers (R-MI), is the first comprehensive review by Congress since 1985---a time when the Cold War still was being fought and the Internet was largely

  16. Tethered subsatellite study

    NASA Technical Reports Server (NTRS)

    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

    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.

  17. Constellation Commodities Studies Summary

    NASA Technical Reports Server (NTRS)

    Dirschka, Eric

    2011-01-01

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

  18. Exploiting Spin Echo Decay in the Detection of Nuclear Quadrupole Resonance Signals

    Microsoft Academic Search

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

    2007-01-01

    Nuclear quadrupole resonance (NQR) is a radio-frequency technique that can be used to detect the presence of quadrupolar nuclei, such as the 14N nucleus prevalent in many explosives and narcotics. In a typical application, one observes trains of decaying NQR echoes, in which the decay is governed by the spin echo decay time(s) of the resonant line(s). In most detection

  19. [The DIAN study].

    PubMed

    Shimada, Hiroyuki

    2013-10-01

    The DIAN study compared the pathophysiological markers between carriers and non-carriers of mutation for autosomal dominant Alzheimer's disease (AD). They used the participant's age at baseline assessment and the parent's age at the onset of symptoms of AD to calculate the estimated delay in symptom onset. The study revealed that the biomarker change, which is the reduction of A?42 in the CSF of the carrier's brain, started approximately 15-20 years prior to the onset of symptoms. Subsequently, a chronological series of events took place: deposition of fibrillar A? as measured by positron emission tomography with the use of Pittsburgh compound B, increase in tau protein in the CSF, hippocampal atrophy and hypometabolism of FDG-PET, and cognitive and clinical changes. The researchers planned to start the prevention trial with 2 monoclonal antibodies and a BACE inhibitor. In contrast, the API study is the clinical trial of the anti-amyloid monoclonal antibody therapy associated with the early-onset familial AD (EOAD), which carries the PSEN1 E280A mutation. This study also showed changes in the same biomarker as reported in the DIAN study. Anti-amyloid treatment in asymptomatic AD (A4) is a prevention trial aimed at treating older individuals with normal cognition but at risk of developing AD dementia on the basis of having biomarker evidence of amyloid (preclinical AD). They selected solanezumab for the anti-amyloid treatment for A4. PMID:24101429

  20. Partial gravity habitat study

    NASA Technical Reports Server (NTRS)

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

    1989-01-01

    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.

  1. Photovoltaics information user study

    SciTech Connect

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

    1980-10-01

    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.

  2. ADVANCED CUTTINGS TRANSPORT STUDY

    SciTech Connect

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

    2000-10-30

    This is the first quarterly progress report for Year 2 of the ACTS project. It includes a review of progress made in Flow Loop development and research during the period of time between July 14, 2000 and September 30, 2000. This report presents information on the following specific tasks: (a) Progress in Advanced Cuttings Transport Facility design and development (Task 2), (b) Progress on research project (Task 8): ''Study of Flow of Synthetic Drilling Fluids Under Elevated Pressure and Temperature Conditions'', (c) Progress on research project (Task 6): ''Study of Cuttings Transport with Foam Under LPAT Conditions (Joint Project with TUDRP)'', (d) Progress on research project (Task 7): ''Study of Cuttings Transport with Aerated Muds Under LPAT Conditions (Joint Project with TUDRP)'', (e) Progress on research project (Task 9): ''Study of Foam Flow Behavior Under EPET Conditions'', (f) Initiate research on project (Task 10): ''Study of Cuttings Transport with Aerated Mud Under Elevated Pressure and Temperature Conditions'', (g) Progress on instrumentation tasks to measure: Cuttings concentration and distribution (Tasks 11), and Foam properties (Task 12), (h) Initiate a comprehensive safety review of all flow-loop components and operational procedures. Since the previous Task 1 has been completed, we will now designate this new task as: (Task 1S). (i) Activities towards technology transfer and developing contacts with Petroleum and service company members, and increasing the number of JIP members.

  3. ADVANCED CUTTINGS TRANSPORT STUDY

    SciTech Connect

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

    2000-01-30

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

  4. Laboratory microfusion capability study

    NASA Astrophysics Data System (ADS)

    1993-05-01

    The purpose of this study is to elucidate the issues involved in developing a Laboratory Microfusion Capability (LMC) which is the major objective of the Inertial Confinement Fusion (ICF) program within the purview of the Department of Energy's Defense Programs. The study was initiated to support a number of DOE management needs: to provide insight for the evolution of the ICF program; to afford guidance to the ICF laboratories in planning their research and development programs; to inform Congress and others of the details and implications of the LMC; to identify criteria for selection of a concept for the Laboratory Microfusion Facility; and to develop a coordinated plan for the realization of an LMC. As originally proposed, the LMC study was divided into two phases. The first phase identifies the purpose and potential utility of the LMC, the regime of its performance parameters, driver independent design issues and requirements, its development goals and requirements, and associated technical, management, staffing, environmental, and other developmental and operational issues. The second phase addresses driver-dependent issues such as specific design, range of performance capabilities, and cost. The study includes four driver options: the neodymium-glass solid state laser, the krypton fluoride excimer gas laser, the light-ion accelerator, and the heavy-ion induction linear accelerator. The results of the Phase 2 study are described in the present report.

  5. Wilson Cycle studies

    NASA Technical Reports Server (NTRS)

    Burke, Kevin

    1987-01-01

    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.

  6. Diboson Physics Studies

    E-print Network

    The ATLAS collaboration

    2009-01-01

    This note presents studies of the sensitivity of the ATLAS experiment to Standard Model diboson (\\WW,\\, \\WZ,\\, \\ZZ,\\, \\Wg,\\, and \\Zg) production in pp collisions at $\\sqrt s = 14\\TeV$, using final states containing electrons, muons and photons. The studies use ATLAS simulated data, which include trigger information and detector calibration and alignment corrections. The influence of backgrounds on diboson detection is assessed using large samples of fully simulated background events. The cross-section measurement uncertainties (both statistical and systematic) are estimated as a function of integrated luminosity (from 0.1 to 30~\\ifb). The studies show that the Standard Model \\WW, \\WZ, \\Wg, and \\Zg signals can be established with significance better than 5$\\sigma $ for the first 0.1~\\ifb of integrated luminosity, and the \\ZZ signal can be established with 1~\\ifb of integrated luminosity. The ATLAS experiment's sensitivity to anomalous triple gauge boson couplings is also estimated. The anomalous triple gauge b...

  7. Optimal symmetric flight studies

    NASA Technical Reports Server (NTRS)

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

    1985-01-01

    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.

  8. Iron studies in hemophilia

    SciTech Connect

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

    1981-12-01

    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.

  9. New coastal studies center

    NASA Astrophysics Data System (ADS)

    The Scripps Institution of Oceanography has established a new center that is charged with coordinating the research and teaching of nearshore ocean processes.Under the director of Douglas L. Inman, who specializes in inshore ocean waves, currents, and sediment transport, the Center for Coastal Studies will be the focus of international research programs as well as ongoing local, regional, and national studies. Members of the center's Shore Processes Study Group have advised many U.S. agencies and foreign governments on aspects of coastal planning, data acquisition and processing, and concepts for coastal protection and sediment management. Long-term cooperative exchange programs are under way with scientists from Israel and Italy; plans are being made for similiar programs with Egypt and the People's Republic of China.

  10. Ventilation technologies scoping study

    SciTech Connect

    Walker, Iain S.; Sherman, Max H.

    2003-09-30

    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).

  11. Parylene C Aging Studies.

    SciTech Connect

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

    2014-09-01

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

  12. Hybrid receiver study

    NASA Technical Reports Server (NTRS)

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

    1977-01-01

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

  13. CTR plasma engineering studies

    SciTech Connect

    Miley, G.H.

    1990-01-01

    The main focus of the work by the Fusion Plasma Engineering Group at the University during the prior contract year involved a study of fusion ash (helium) effects on burn efficiency and on potential ways to control ash buildup. This work has wide application to a variety of fusion reactor concepts, but the immediate application for the present work is in the ARIES tokamak reactor design study now being undertaken by a national design team headed by the UCLA. The examples presented here largely deal with the ARIES-I design which is a D-T device operating in the first instability regime.

  14. Radionuclide studies in impotence

    SciTech Connect

    Hilson, A.J.; Lewis, C.A. (St. Peter's Hospitals, London (England))

    1991-04-01

    Impotence may be of physiological origin with causes including vascular or neurological pathology. Alternatively, it may be of psychogenic origin. Clinicians can distinguish between psychological and organic impotence by observing nocturnal penile tumescence. Non-radionuclide investigations for organic impotence include penile plethysmography or pulse Doppler analysis for arterial supply, cavernosometry for venous drainage, and biothesiometry or evoked potentials for neurological pathology. Radionuclide studies are primarily based on the use of technetium 99m-pertechnetate, 99mTc-red blood cells, or xenon 133 to study the blood flow, with or without pharmacological intervention, commonly papaverine. 26 references.

  15. Reporting of teratology studies.

    PubMed

    Barrow, Paul C; Reynaud, Lucie

    2013-01-01

    The regulatory toxicology report is an unusual document that requires a particular skill to write. The report must be clear, accurate, concise, and focused. A clear and direct writing style is required. The end-users of the report will hope to find the information they seek with as little effort as possible. Few, or none, will read the entire document. The author should aim to appease the user by obliging him to read as little text and turn as few pages as possible. This chapter gives tips and guidance on how to present the experimental data and write the narrative text in the final study report for a teratology study. PMID:23138913

  16. Impact ionization study

    NASA Technical Reports Server (NTRS)

    Whipple, E. C., Jr.

    1982-01-01

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

  17. Fathead fecundity study

    SciTech Connect

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

    1995-12-31

    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.

  18. Fossil crinoid studies

    E-print Network

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

    1974-11-15

    —Paper 73 Pic. 4. (For explanation see facing page.) Pabian & Strimple-Crinoid Studies & Lane, 1970, p. 283, 284, pl. 55, fig. 18, 19, pl. 57, fig. 10-15. Diagnosis.-See Strimple, 1961, p. 36-39. Occurrence.-Lower Pennsylvanian (Mor- rowan), USA...—Paper 73 Pic. 4. (For explanation see facing page.) Pabian & Strimple-Crinoid Studies & Lane, 1970, p. 283, 284, pl. 55, fig. 18, 19, pl. 57, fig. 10-15. Diagnosis.-See Strimple, 1961, p. 36-39. Occurrence.-Lower Pennsylvanian (Mor- rowan), USA...

  19. 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

  20. STUDY ABROAD STUDY ABROADFOR RADIO-TELEVISION-FILM MAJORS

    E-print Network

    Johnston, Daniel

    STUDY ABROAD STUDY ABROADFOR RADIO-TELEVISION-FILM MAJORS #12;WHY YOU SHOULD STUDY ABROAD 2 STUDY ABROAD FOR RADIO-TELEVISION-FILM MAJORS Study abroad programs provide Radio-Television-Film majors my UT financial aid? STUDY ABROAD FOR RADIO-TELEVISION-FILM MAJORS 3 · How will I get credit

  1. STUDY ABROADFOR MARINE AND FRESHWATER BIOLOGY MAJORS study abroad

    E-print Network

    John, Lizy Kurian

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

  2. STUDY ABROADFOR TEXTILES AND APPAREL MAJORS study abroad

    E-print Network

    John, Lizy Kurian

    STUDY ABROADFOR TEXTILES AND APPAREL MAJORS study abroad #12;WHY YOU SHOULD STUDY ABROAD 2 STUDY ABROAD FOR TEXTILES AND APPAREL MAJORS Study abroad programs provide Textiles and Apparel majors.S. textile, apparel, and retailing industries are outsourcing to foreign countries, study abroad builds

  3. Women's Studies 263S Introduction to Women's and Gender Studies

    E-print Network

    Vonessen, Nikolaus

    1 Women's Studies 263S Introduction to Women's and Gender Studies Tuesday/Thursday 12:40-2:00 LA to introduce students to the broad fields of women's and gender studies through an overview of a number, women's studies, gender studies, and the growing field of queer studies; biological and psychological

  4. Comparative study of \\

    Microsoft Academic Search

    Homer Papadopoulos

    2008-01-01

    The paper compares the findings coming from three case studies for the case of mobile data services and highlights factors that could explain the low usage rates among the users. The movement of applications from desktop platforms to wireless and mobile configurations may have a significant impact on future daily activities. Mobile computing supported by broadband wireless networks allows users

  5. Tethered gravity laboratories study

    NASA Technical Reports Server (NTRS)

    Lucchetti, F.

    1989-01-01

    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.

  6. Communication & Media Studies

    Microsoft Academic Search

    David R. Anderson

    The Communication & Media Studies Division is one of the growing academic divisions at Cornerstone. We are passionate about instructing, equipping, and mentoring students who we can empower to engage the marketplace of ideas in creative and strategic ways as they take their graduation portfolios into their first jobs as skilled agents of reconciliation in their spheres of influence. Our

  7. Introduction Intercultural Studies

    E-print Network

    Banbara, Mutsunori

    communication, nonverbal communication, and statistics for social studies. I am able to broaden and deepen my interdisciplinary curriculum is carefully designed to help students develop international understanding and intercultural communication skills through small-group instruction, a range of language programs, active

  8. Studies in Manpower Planning.

    ERIC Educational Resources Information Center

    Charnes, A.; And Others

    This compilation consists of a collection of reports on models and studies in the area of manpower management and planning. Part One contains a doctoral dissertation, "The Application of Computer-Assisted Multi-Level Manpower Planning Models in the Federal Government" by R. J. Niehaus, which provides a comprehensive summary of the U.S. Navy's…

  9. 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.

  10. Screen Study Guides.

    ERIC Educational Resources Information Center

    Duncan, Barry

    1969-01-01

    This study guide for Arthur Lipsett's film "Very Nice, Very Nice" is in four parts. First, it describes and evaluates the film, discusses Lipsett's unusual juxtapositions, fast cutting, and fragmented speeches as indications of his satirical intent, and suggests that the only meaningful summation of the film's content is through pattern…

  11. Subaltern Studies: A Bibliography

    NSDL National Science Digital Library

    Conlon, Frank F.

    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.

  12. Graduate Studies in Education

    E-print Network

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

  13. 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...

  14. Cavitation studies in microgravity

    Microsoft Academic Search

    Philippe Kobel; Danail Obreschkow; Mohamed Farhat; Nicolas Dorsaz; Aurele de Bosset

    2010-01-01

    The hydrodynamic cavitation phenomenon is a major source of erosion for many industrial systems such as cryogenic pumps for rocket propulsion, fast ship propellers, hydraulic pipelines and turbines. Erosive processes are associated with liquid jets and shockwaves emission fol-lowing the cavity collapse. Yet, fundamental understanding of these processes requires further cavitation studies inside various geometries of liquid volumes, as the

  15. Psycholinguistic Attitude Study.

    ERIC Educational Resources Information Center

    Bouchard, Ellen L.

    The subjects in this study, 18 fifth- and sixth-grade students from a middle-class area, were asked to listen to a tape recording with excerpts of conversations by speakers of three dialects: middle-class white, lower-class white, and lower-class Negro. Subjects were asked to rate the personality of each speaker by voice cues alone. In addition,…

  16. Energetic component treatability study

    Microsoft Academic Search

    P. D. Gildea; S. L. Brandon; B. G. Brown

    1997-01-01

    The effectiveness of three environmentally sound processes for small energetic component disposal was examined experimentally in this study. The three destruction methods, batch reactor supercritical water oxidation, sodium hydroxide base hydrolysis and calcium carbonate cookoff were selected based on their potential for producing a clean solid residue and minimum release of toxic gases after component detonation. The explosive hazard was

  17. EUDISED: Technical Studies, 1971.

    ERIC Educational Resources Information Center

    Council of Europe, Strasbourg (France). Documentation Center for Education in Europe.

    This collection of technical studies concerning the European Documentation and Information System for Education (EUDISED) presents the problems of educational information, documentation, and dissemination in Europe. In the first report, transmitter-receiver relationships and the understanding of each other's roles and needs are discussed. The…

  18. 19 Pueblo Dropout Study.

    ERIC Educational Resources Information Center

    Naranjo, Tessie; Laktasic, Stanley

    Primary objectives of the first comprehensive study of New Mexico Pueblo school dropouts were to identify and locate such dropouts, to determine reasons for Pueblo dropouts, and to identify types of counseling and services available. Of 710 identified dropouts, 328 from the 19 Pueblos were interviewed in home visits. Personal reasons (seeing no…

  19. Jealousy: a community study.

    PubMed

    Mullen, P E; Martin, J

    1994-01-01

    This study represents the first attempt to study sexual jealousy in a random community sample. Jealousy was reported by all subjects. Men, when jealous, were particularly concerned about the potential loss of the partner, whereas women were more concerned with the effects of infidelity on the quality of the relationship. Behaviours such as searching the partner's belongings or inspecting their clothes for signs of sexual activity correlated with unusually intense jealousy. Men tended to cope with jealousy by using denial and avoidance, whereas women were more likely to express their distress and to try to make themselves more attractive to their erring partner. Greater jealousy concerns were expressed by young men who had either married early or were now living without a partner. Heavy drinkers and those reporting more psychiatric symptoms were also more prone to jealousy. A clear correlation emerged between lowered self-esteem and increased jealousy, which was particularly marked in women, for whom robust self-esteem was virtually incompatible with high jealousy concerns. The study supported the prosaic notion that those who are satisfied with their romantic attachments are less prone to jealous suspicions. This study offers a starting point for the clinician seeking information about the experience of jealousy in the community. PMID:8137108

  20. Stress studies in EFG

    NASA Technical Reports Server (NTRS)

    Kalejs, J. P.

    1984-01-01

    Stress studies in edge-defined film-fed growth (EFG) are discussed. The goals were to develop an understanding of the mechanism of stress generation in silicon sheet growth and to define minimum stress growth configurations 200 micron thick 10 cm wide EFG ribbon growing at 4 cm/min.

  1. Dynamic EKG Study

    NASA Technical Reports Server (NTRS)

    Fleck, R. L.

    1970-01-01

    The use of the dynamic EKG study as a part of periodic health examination is considered to be a valuable complement to other forms of stress testing with its ability to detect abnormal heart responses to stress stimuli. It is believed that statistical correlations of dynamic EKG findings with physical examination results contribute greatly to the understanding of cardiac abnormalities.

  2. Early Childhood Social Studies.

    ERIC Educational Resources Information Center

    Jantz, Richard K.; Seefeldt, Carol

    Noting ongoing difficulties in identifying the fundamental role of social studies in educating young children, this chapter focuses on how children begin to develop historical and geographic understanding. The chapter considers age-appropriate and developmental concerns and the role of national standards in history and geography. The chapter…

  3. The Black Studies Debate.

    ERIC Educational Resources Information Center

    Gordon, Jacob U., Ed.; Rosser, James M., Ed.

    Beginning with the selection of Professor Newby, who attempts to reveal the role which historians, perhaps more specifically white historians, have played and continue to play in the perpetuation of racism in American culture, this anthology concludes with an analysis of the present status of Black Studies. W. Arthur Lewis' critical essay attempts…

  4. CTR plasma engineering studies

    SciTech Connect

    Miley, G.H.

    1991-01-01

    Ash (e.g. thermalized helium from D-T) buildup in a tokamak can potentially prevent ignition and seriously degrade the fusion energy gain from driven system. This problem is most pronounced as the ratio of particle/energy confinement time increases towards the neoclassical limit. Yet much improved confinement of the fuel ions is desirable for a fusion reactor. The goals of the work described here were two fold: to study the effect of helium buildup on the energy balance for a tokamak, and consider methods of active control that might be employed to alleviate the problem. We examine ash buildup effect for both D-T and D-{sup 3}He systems. Most examples used apply to the ARIES 1 D-T reactor design and to the ARIES 3 D-{sup 3}He design since part of this was in support of these two designs. Then we report on brief studies of two potentially attractive control methods, namely controlled sawtooth and fishbone instabilities. The concept is that sawteeth or fishbones would be used on purpose periodically in order to flush'' out excess ash from the fusion core. Both methods are shown to feasible and attractive. More study is needed, however, since the phenomenona in which are physically complex. Still the pay off, namely, reduced ash buildup, is exceedingly important so that such studies desires strong attention.

  5. Aircraft EMP isolation study

    NASA Astrophysics Data System (ADS)

    Finci, A.; Price, H.; Chao, P.; Mercer, S.; Naff, T.

    1980-07-01

    This report presents the results of a preliminary study into methods for electrically isolating the E-4B, the EC-135, and the EC-130 aircraft during EMP tests where the aircraft under test is directly driven by a high-voltage pulser.

  6. Medicine and health studies

    E-print Network

    Sussex, University of

    Medicine and health studies Key facts · The excellent reputation of Sussex in research related to medicine has been enhanced by the opening of BSMS. Working with partners such as the Genome Damage. · Medicine at BSMS was ranked in the top 20 in the UK in The Guardian University Guide 2013. · At present

  7. Eastern Frequency Response Study

    SciTech Connect

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

    2013-05-01

    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.

  8. Case Study: Ecosystem Transformations

    E-print Network

    Nippert, Jesse

    142 Chapter 15 Case Study: Ecosystem Transformations Along The Colorado Front Range: Prairie Dog-tailed prairie dog. Directional changes in climate and atmospheric chemistry are altering the environment foothills and mixed-grass to short-grass prairie. Among these direc- tional changes are elevated average

  9. GRADUATE STUDY IN BIOENGINEERING

    E-print Network

    Richards-Kortum, Rebecca

    grant to study the protein networks that drive cancer cell develop- ment, a grant from the United States Department of Agriculture to develop a new generation of renewable energy and bio-based products a fundamental understanding of basic life and medical sciences, as well as advanced analytical and engineering

  10. Racer efficacy study

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Racer (ammonium nonanoate) is a non-selective contact herbicide that controls several weed species. Racer has been labeled by EPA in the past year for weed control in food crops and is close to receiving approval for use by organic producers. The objective of this study was to verify results from ...

  11. Native American Case Studies

    NSDL National Science Digital Library

    The Evergreen State College

    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.

  12. International Studies and Programs

    E-print Network

    Liu, Taosheng

    in the colleges of business, natural science and engineering. - Highest numbers of international scholars in 2008· programming Promoting cultural· differences as an educational resource Office for International StudentsInternational Studies and Programs International Students and Scholars at MSU Fast Facts

  13. 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...

  14. Power system commonality study

    Microsoft Academic Search

    Franklin D. Littman

    1992-01-01

    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

  15. Comet rendezvous mission study

    NASA Technical Reports Server (NTRS)

    Friedlander, A. L.; Wells, W. C.

    1971-01-01

    Four periodic comets with perihelia between 1980 and 1986 (Encke, d'Arrest, Kipff, and Halley) are used as candidates for the comet rendezvous mission study. All these comet apparitions are especially favorable for rendezvous missions, because of early earth-based comet recovery, good opportunities to view their activity from earth, and reasonable launch vehicle and trajectory requirements for nominal payloads.

  16. Humanizing Home Study.

    ERIC Educational Resources Information Center

    Hass, Glen; Fleury, Donna

    The use of correspondence or home study courses for noncredit is a recent development in the field of adult education. The challenge facing the extension worker is to be able to develop and deliver the type of program that not only meets the learning (content) need of the participant but that also meets the learning situation. Unfortunately, the…

  17. Autism\\/excel study

    Microsoft Academic Search

    Mary Hart

    2005-01-01

    Five high school students with ASD (autistic spectrum disorder) participating in the Excel\\/Autism study were able to demonstrate mastery of a set of Excel topics. The Excel curriculum covered approximately the same topics as are covered in the Excel portion of Computer Business Applications, a class for regular education students at Fox Chapel Area High School, a high school in

  18. 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...

  19. 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. 

  20. Acid Rain Study Guide.

    ERIC Educational Resources Information Center

    Hunger, Carolyn; And Others

    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…

  1. Regenerative fuel cell study

    NASA Technical Reports Server (NTRS)

    Wynveen, R. A.; Schubert, F. H.

    1972-01-01

    The completion of the study is reported for the regenerative fuel cell subsystem (RFCS) as an energy storage process for use aboard the space shuttle launched modular space station (MSS). The MSS mission requirements, and RFCS are discussed, and a comparison between RFCS and a nickel cadmium battery subsystem is presented. Development costs are also discussed.

  2. Digital communications study

    NASA Technical Reports Server (NTRS)

    Boorstyn, R. R.

    1973-01-01

    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.

  3. Study Blasts Leadership Preparation

    ERIC Educational Resources Information Center

    Archer, Jeff

    2005-01-01

    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…

  4. Stress studies in EFG

    NASA Astrophysics Data System (ADS)

    Kalejs, J. P.

    1984-03-01

    Stress studies in edge-defined film-fed growth (EFG) are discussed. The goals were to develop an understanding of the mechanism of stress generation in silicon sheet growth and to define minimum stress growth configurations 200 micron thick 10 cm wide EFG ribbon growing at 4 cm/min.

  5. Australian Film Studies.

    ERIC Educational Resources Information Center

    Breen, Myles P.

    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,…

  6. Environmental Engineering GRADUATE STUDIES

    E-print Network

    Wang, Yuhang

    Environmental Engineering GRADUATE STUDIES ENVIRONMENTAL ENGINEERING (EnvE) at Georgia Tech-caliber students from a variety of engineering and science disciplines. Environmental Engineering is also a key in Environmental Engi- neering emphasize basic engineering and sci- entific principles, system design, applications

  7. Gender Studies & Feminist Research

    E-print Network

    Thompson, Michael

    in the Urban Culture Industries" MICHELE LANDSBERG | With the Dean of Humanities Office February 24, 2012 | 7'S) | With English & Cultural Studies February 7, 2012 | 7:30PM | CIBC Hall, MUSC 319 "Feminism, NeoLiberalism and Family: Human Capital at Home" February 9, 2012 | 1:30PM | TSH 118 "Be Creative: Making a Living

  8. Polymer infiltration studies

    NASA Technical Reports Server (NTRS)

    Marchello, Joseph M.

    1992-01-01

    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.

  9. Graduate Time Study. 1992.

    ERIC Educational Resources Information Center

    Harrisburg Area Community Coll., PA. Office of Institutional Research.

    To determine the average time students take to complete an associate degree, certificate, or diploma, Harrisburg Area Community College (HACC), in Pennsylvania, conducted a study of all 944 students who graduated during the 1991-92 academic year. Data for the sample were gathered related to age, sex, grade point average, academic major, attendance…

  10. Development studies Taught degrees

    E-print Network

    Sussex, University of

    ) PhD in Development Studies (IDS) Related degrees MA in Anthropology of Development and Social, with at least 22 in Listening, 23 in Reading, 23 in Speaking and 24 in Writing All degrees in the School with 88 overall, with at least 20 in Listening, 20 in Reading, 22 in Speaking and 24 in Writing. For more

  11. Entomological study of myiasis

    Microsoft Academic Search

    P. K. Kakar; V. P. Sood; B. L. Wattal; K. R. Gupta

    1970-01-01

    Summary  Maggots from twenty cases suffering from nasal myiasis admitted in Irwin Hospital were studied. These maggots were cultured\\u000a and the fly that hatched out was identified as chrysomyia bezziana in all the cases. The methods of culture have been described.

  12. Teaching Biblical Studies Online

    ERIC Educational Resources Information Center

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

    2011-01-01

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

  13. NEVADA ARSENIC STUDY

    EPA Science Inventory

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

  14. Faculty Retention Study, 2002.

    ERIC Educational Resources Information Center

    South Texas Community Coll., McAllen. Office of Institutional Research and Effectiveness.

    This survey attempted to study factors important to making faculty decide to continue or terminate employment at South Texas Community College (STCC). Surveys were e-mailed to 276 full time, regular faculty and 170 adjunct faculty with valid STCC e-mail addresses. Although 54% (150) of the full time faculty responded to the survey, it remains a…

  15. Special study separations considerations

    Microsoft Academic Search

    1955-01-01

    One of the potential operating plans considered at HAPO involved the irradiation of an E--N loading for simultaneous plutonium and tritium manufacture. The conditions of the study required that the ``25`` content of the E slugs be the maximum compatible with their recovery in existing or slightly modified separations facilities. This memorandum reviews the status of knowledge and best guesses

  16. Fundamental studies in geodynamics

    NASA Technical Reports Server (NTRS)

    Anderson, D. L.

    1980-01-01

    Progress in modeling instantaneous plate kinematics is reviewed, with emphasis on recently developed models of present day plate motions derived by the systematic inversion of globally distributed data sets. Rivera plate motions, the Caribbean South American boundary, Indian plate deformation, Pacific-North America, seismicity and subduction processes, and the study of slow earthquakes and free oscillations are discussed.

  17. Translation Studies with

    E-print Network

    Little, Tony

    together a translation portfolio based on an area of particular interest with your future career in mindMSc in Translation Studies with TESOL School of Arts and Humanities A fantastic gateway to a career is key. A career in translation could see you specialise in a whole range of diverse fields in public

  18. Urban Expansion Study

    NASA Technical Reports Server (NTRS)

    1985-01-01

    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.

  19. TECHNOLOGICAL STUDIES THE STARFISH

    E-print Network

    favorable. Star- fish spawning usually starts in June, some two to six weeks earlier than oyster spawningTECHNOLOGICAL STUDIES OF THE STARFISH FISHERY LEAFLET 391 FISH AND WILDLIFE SERVICE United States OF THE STARFISH FISHERY LEAFLET 391 FISH AND WILDLIFE SERVICE United States Department oi the Interioi Washington

  20. Social Studies Journal, 2003.

    ERIC Educational Resources Information Center

    West, Leo R., Ed.

    2003-01-01

    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…

  1. PHILADELPHIA ROADWAY STUDY

    EPA Science Inventory

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

  2. Central American resource studies

    Microsoft Academic Search

    E. Van Eeckhout; A. W. Laughlin

    1989-01-01

    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

  3. 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 ...

  4. Social Studies: Grade 8.

    ERIC Educational Resources Information Center

    Manitoba Dept. of Education, Winnipeg.

    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,…

  5. Punta Verraco environmental studies

    Microsoft Academic Search

    E. D. Wood; M. J. Youngbluth; P. Yoshioka; M. Canoy

    1975-01-01

    The Puerto Rico Nuclear Center of the University of Puerto Rico has been ; under contract to the Puerto Rico Water Resources Authority since 1972 to conduct ; site selection surveys and environmental research studies of seven coastal sites. ; Experience gained from these investigations will add to the knowledge about these ; areas, and provide useful data which will

  6. 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...

  7. Case Studies in Biology.

    ERIC Educational Resources Information Center

    Zeakes, Samuel J.

    1989-01-01

    A case study writing exercise used in a course on parasitology was found to be a powerful learning experience for students because it involved discipline-based technical writing and terminology, brought the students in as evaluators, applied current learning, caused interaction among all students, and simulated real professional activities. (MSE)

  8. Oxygen boost pump study

    NASA Technical Reports Server (NTRS)

    1975-01-01

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

  9. Repository seals requirements study

    SciTech Connect

    NONE

    1997-11-03

    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.

  10. Technion Libraries Systems Study.

    ERIC Educational Resources Information Center

    Thomas, Pauline

    This study is aimed at clarifying the objectives of the Technion Libraries' Systems, both within the Technion and as a national information resource, by defining the structure, organization, and methods to achieve these objectives. It considers Technion's future plans and current library practices as based on reports on the system, Technion…

  11. Ecological Field Studies

    ERIC Educational Resources Information Center

    Dobson, Christopher

    2008-01-01

    Field studies are an excellent way for students to learn ecological concepts and practice doing science. This article presents an approach for the secondary science classroom that permits students to ask and answer their own questions, a prerequisite for truly experiencing the process of science. Students explore a local natural area and, in…

  12. Joint Honours AFRICAN STUDIES

    E-print Network

    Miall, Chris

    : The Joint Honours African Studies degree programme at Birmingham is broad, combining arts and social Office - Retail management - Aid work with Save the Children - Probation work - Welfare rights worker - Computer programmer - NGO work in Kurdistan - Work with adults who have learning disabilities - Research

  13. Outdoor Unified Studies.

    ERIC Educational Resources Information Center

    Liston, Louise

    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…

  14. STUDY ABROAD @ ULM UNIVERSITY

    E-print Network

    Pfeifer, Holger

    as Energy Carrier Polymeric Materials Colloid Chemistry Introduction to Quantum Chemistry SurfacesSTUDY ABROAD @ ULM UNIVERSITY CHEMISTRY CHEMISTRY AND MANAGEMENT ENERGY SCIENCE AND TECHNOLOGY Ulm University--ChemistryUlm University--Chemistry Ulm University--Chemistry Websites Ulm University: http

  15. ISR study at Belle

    SciTech Connect

    Pakhlova, G. [Institute for Theoretical and Experimental Physics, Moscow (Russian Federation)

    2007-02-27

    We present a study of Y(4260) properties and measurements of the exclusive e+e- {yields} D(*)D-bar* cross section as a function of center-of-mass energy near the D(*)D-bar* threshold using the initial state radiation.

  16. RADON / MOISTURE STUDY

    EPA Science Inventory

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

  17. Geothermal Case Studies

    DOE Data Explorer

    Young, Katherine

    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.

  18. Turbine blade damping study

    NASA Technical Reports Server (NTRS)

    Dominic, R. J.

    1984-01-01

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

  19. Geosynchronous Technology Infusion Studies

    NASA Technical Reports Server (NTRS)

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

    1997-01-01

    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.

  20. Remedial Reading: Case Studies.

    ERIC Educational Resources Information Center

    Bentall, Grace

    1972-01-01

    This monograph discusses actual case studies which demonstrate that children learn in many different ways. The methods used are discussed, and wherever possible, the results of the work are cited. The pamphlet also points out that team work among the medical professions, the parents, the child, and the teacher is needed. The areas covered by the…

  1. Unionfining: Technical case studies

    SciTech Connect

    Nguyen, T.A.; Skripek, M. [Unocal Fred L. Hartley Research Center, Brea, CA (United States)

    1994-12-31

    Hydrotreating improves the quality of FCC feeds by reducing sulfur, nitrogen, metals, asphaltenes, and polynuclear aromatic content. Four case studies presented in this paper show the benefits of hydrotreating FCC feeds: higher conversion and gasoline yield, better quality products, and lower SO{sub x} emissions.

  2. Arc electrode interaction study

    NASA Technical Reports Server (NTRS)

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

    1994-01-01

    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.

  3. Photovoltaic evaluation study

    NASA Astrophysics Data System (ADS)

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

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

  4. Options Study - Phase II

    SciTech Connect

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

    2010-09-01

    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.

  5. E85 Dispenser Study

    SciTech Connect

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

    2009-12-01

    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.

  6. EOS mapping accuracy study

    NASA Technical Reports Server (NTRS)

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

    1973-01-01

    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.

  7. Ferrocyanide safety study

    SciTech Connect

    Wegeng, R.S.

    1989-05-01

    The overall objective of this study is to investigate the potentially rapid reactions between the ferrocyanide-containing salts, present in the SST's, and oxidants, such as nitrate, also present in the SST's. The objective of the energetics subtask is to investigate, on a screening basis, SST operational and compositional parameters which could affect the reaction between nickel cesium ferrocyanide, the expected form of cyanide in the SST, and nitrates and/or the nitrate radiolysis product nitrite. The objective of the large-scale explosion study is to independently confirm the results of the PNL laboratory-scale experiments and to determine the explosive behavior of a large sample of ferrocyanide and oxidant. The objective of the PNL-5441 revision subtask is to revise the complexant stability report, PNL-5441, to provide a current overview of the ferrocyanide safety issue and provide information to permit establishment of guidelines for SST management. 1 fig.

  8. The Study of Mercury

    NASA Astrophysics Data System (ADS)

    Prockter, Louise M.; Bedini, Peter D.

    2010-01-01

    When the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft enters orbit about Mercury in March 2011 it will begin a new phase in an age-old scientific study of the innermost planet. Despite being visible to the unaided eye, Mercury's proximity to the Sun makes it extremely difficult to observe from Earth. Nonetheless, over the centuries man has pursued a quest to understand the elusive planet, and has teased out information about its motions in the sky, its relation to the other planets, and its physical characteristics. A great leap was made in our understanding of Mercury when the Mariner 10 spacecraft flew past it three times in the mid-1970s, providing a rich set of close-up observations. Now, three decades later, The MESSENGER spacecraft has also visited the planet three times, and is poised to add significantly to the study with a year-long orbital observation campaign.

  9. Sylgard® Mixing Study

    SciTech Connect

    Bello, Mollie [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Welch, Cynthia F. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Goodwin, Lynne Alese [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Keller, Jennie [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2014-08-22

    Sylgard® 184 and Sylgard® 186 silicone elastomers form Dow Corning® are used as potting agents across the Nuclear Weapons Complex. A standardized mixing procedure is required for filled versions of these products. The present study is a follow-up to a mixing study performed by MST-7 which established the best mixing procedure to use when adding filler to either 184 or 186 base resins. The most effective and consistent method of mixing resin and curing agent for three modified silicone elastomer recipes is outlined in this report. For each recipe, sample size, mixing type, and mixing time was varied over 10 separate runs. The results show that the THINKY™ Mixer gives reliable mixing over varying batch sizes and mixing times. Hand Mixing can give improved mixing, as indicated by reduced initial viscosity; however, this method is not consistent.

  10. Pathology Case Study: Epilepsy

    NSDL National Science Digital Library

    French, Jacqueline A.

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

  11. Protein crystallization studies

    NASA Technical Reports Server (NTRS)

    Lyne, James Evans

    1996-01-01

    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.

  12. A Wetland Field Study

    NSDL National Science Digital Library

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

  13. Fundamental Pyrolysis Studies

    SciTech Connect

    Milne, T. A.; Evans, R. J.; Soltys, M. N.

    1983-03-01

    Progress on the direct mass spectrometric sampling of pyrolysis products from wood and its constituents is described for the period from June 1982 to February 1983. A brief summary and references to detailed reports, of the qualitative demonstration of our approach to the study of the separated processes of primary and secondary pyrolysis is presented. Improvements and additions to the pyrolysis and data acquisition systems are discussed and typical results shown. Chief of these are a heated-grid pyrolysis system for controlled primary pyrolysis and a sheathed flame arrangement for secondary cracking studies. Qualitative results of the secondary cracking of cellulose, lignin, and wood are shown as are comparisons with the literature for the pyrolysis spectra of cellulose, lignin, and levoglucosan. 'Fingerprints' for a number of materials are shown, with spectra taken under carefully controlled conditions so that sensitivity calibrations for different compounds, now being determined, can be applied.

  14. RF Gun Optimization Study

    SciTech Connect

    A. S. Hofler; P. Evtushenko; M. Krasilnikov

    2007-08-01

    Injector gun design is an iterative process where the designer optimizes a few nonlinearly interdependent beam parameters to achieve the required beam quality for a particle accelerator. Few tools exist to automate the optimization process and thoroughly explore the parameter space. The challenging beam requirements of new accelerator applications such as light sources and electron cooling devices drive the development of RF and SRF photo injectors. RF and SRF gun design is further complicated because the bunches are space charge dominated and require additional emittance compensation. A genetic algorithm has been successfully used to optimize DC photo injector designs for Cornell* and Jefferson Lab**, and we propose studying how the genetic algorithm techniques can be applied to the design of RF and SRF gun injectors. In this paper, we report on the initial phase of the study where we model and optimize gun designs that have been benchmarked with beam measurements and simulation.

  15. LOXT mirror design study

    NASA Technical Reports Server (NTRS)

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

    1972-01-01

    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.

  16. EUROv Super Beam Studies

    SciTech Connect

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

    2011-10-06

    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.

  17. STUDIES ON STREAMING

    PubMed Central

    Nachmias, Vivianne T.

    1969-01-01

    In Chaos chaos streaming, motility, and cytokinesis were inhibited nearly 100% for several hours by 2.5–5 mM sodium adenosine triphosphate (ATP)1 added to culture fluid. All three effects were completely prevented by the addition of equimolar Mg++ or Ca++ ions but not Na+ to the ATP/culture fluid solution. The effects of ATP were not reproduced by EDTA, EGTA, colchicine, or AMP. Sodium pyrophosphate produced about 50% inhibition at 5 mM. Studies with 14C-ATP showed that 5 x 10-5 to 5 x 10-4 mmole of ATP was firmly associated with each milliliter of packed cells after an hour's incubation at 24°C. Labeling studies also showed that prevention of the ATP effects by Mg++ ions was not due to a decrease in the amount of ATP associated with the cells. PMID:4302021

  18. Coastal Management case study

    NSDL National Science Digital Library

    Anne Jefferson

    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.

  19. 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.

  20. Study Thermographic Flaw Detection

    NASA Technical Reports Server (NTRS)

    Walker, James L.; Workman, Gary L.

    1996-01-01

    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.

  1. AMTEC material studies

    NASA Astrophysics Data System (ADS)

    Schuller, Michael; Fiebig, Brad; Hudson, Patricia; Svedberg, Robert

    1999-01-01

    Texas A&M University, in conjunction with Advanced Modular Power Systems, is performing a series of material studies on key components of an alkali metal thermal to electric conversion (AMTEC) cell for the NASA outer planets power system program. These studies involve SEM, x-ray mapping, EDS, and WDS analysis of AMTEC components from unexposed (as built) samples, from sodium exposure tests, and from operating cells, specifically PX-4C and PX-5B run at the Air Force Research Lab's Phillips Research Site. Findings are still prelimary, but indicate that recrystallization regions seen in the oven samples are an artifact of excess sodium and oxygen levels in those tests, more potassium is present than expected, and that diffusion bonding between the current collector and electrode takes place.

  2. 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.

  3. Repository seals requirement study

    SciTech Connect

    NONE

    1997-11-03

    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.

  4. World Biofuels Study

    SciTech Connect

    Alfstad,T.

    2008-10-01

    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.

  5. 2007 CEO Compensation Study

    NSDL National Science Digital Library

    2007-08-01

    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.

  6. Protein Crystal Quality Studies

    NASA Technical Reports Server (NTRS)

    1998-01-01

    Eddie Snell, Post-Doctoral Fellow the National Research Council (NRC) uses a reciprocal space mapping diffractometer for macromolecular crystal quality studies. The diffractometer is used in mapping the structure of macromolecules such as proteins to determine their structure and thus understand how they function with other proteins in the body. This is one of several analytical tools used on proteins crystallized on Earth and in space experiments. Photo credit: NASA/Marshall Space Flight Center (MSFC)

  7. Spallation studies at SATURNE

    NASA Astrophysics Data System (ADS)

    Fréhaut, J.

    1995-09-01

    SATURNE is a synchrotron accelerator which can deliver particles of momentum P and charge Z up to P/Z=4 GeV/c. Monokinetic neutron beams of momentum up to 2 GeV/c can be produced. The spallation studies deal with measurements of: (i) differential neutron production cross sections from thin targets, (ii) neutron multiplicity distribution for proton and 3He induced reactions, and (iii) nuclide production in thin targets. Measurements on thick or composite targets are under consideration.

  8. Bioequivalence studies for levothyroxine

    Microsoft Academic Search

    Sanford Bolton

    2005-01-01

    The Food and Drug Administration (FDA) Guidance for Bioavailability and Bioequivalence Studies for Levothyroxine has been\\u000a challenged by companies that manufacture brand-name products. Their contention is that the current guidance does not adequately\\u000a address the endogenous background levels of the drug, and that the ratios of the PK parameters, a basis for approval of equivalence,\\u000a are not assessed correctly. In

  9. HIRIS performance study

    NASA Technical Reports Server (NTRS)

    Kerekes, John P.; Landgrebe, David A.

    1989-01-01

    The remote sensing system simulation is used to study a proposed sensor concept. An overview of the instrument and its parameters is presented, along with the model of the instrument as implemented in the simulation. Signal-to-noise levels of the instrument under a variety of system configurations are presented and discussed. Classification performance under these varying configurations is also shown, along with relationships between signal-to-noise ratios, feature selection, and classification performance.

  10. Mars Rover RTG Study

    SciTech Connect

    Schock, Alfred

    1989-08-25

    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.

  11. General Entomology Study Materials

    NSDL National Science Digital Library

    0000-00-00

    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.

  12. Fundamental studies in geodynamics

    NASA Technical Reports Server (NTRS)

    Anderson, D. L.; Hager, B. H.; Kanamori, H.

    1981-01-01

    Research in fundamental studies in geodynamics continued in a number of fields including seismic observations and analysis, synthesis of geochemical data, theoretical investigation of geoid anomalies, extensive numerical experiments in a number of geodynamical contexts, and a new field seismic volcanology. Summaries of work in progress or completed during this report period are given. Abstracts of publications submitted from work in progress during this report period are attached as an appendix.

  13. 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."

  14. Study of atmospheric dynamics

    NASA Technical Reports Server (NTRS)

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

    1993-01-01

    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.

  15. Laser Initiated Actuator study

    SciTech Connect

    Watson, B.

    1991-06-27

    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.

  16. Studies in Ranunculus

    Microsoft Academic Search

    E. M. Marsden-Jones; W. B. Turrill

    1952-01-01

    Summary  This paper is a continuation of two previous papers on the genetics ofRanunculus bulbosus andR. acris. Characters studied are flower colour and sex in both species, poor development of petals in the former and leaf blotch in\\u000a the latter species. Evidence is given that these have all a genetic basis, but the ratios are often disturbed by the occurrence\\u000a of

  17. Software breadboard study

    NASA Technical Reports Server (NTRS)

    Nuckolls, C.; Frank, Mark

    1990-01-01

    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.

  18. ATBC Study - Accessibility

    Cancer.gov

    The ATBC Study respects the privacy of visitors to our Web site. We collect a limited amount of information on usage of the Web site for statistical purposes, in order to measure the number of visitors to the various sections of the site and to help us make the site more useful to visitors. Federal government Web sites are generally prohibited from using persistent cookies and this site does not employ them.

  19. Purified water quality study

    SciTech Connect

    Spinka, H.; Jackowski, P.

    2000-04-03

    Argonne National Laboratory (HEP) is examining the use of purified water for the detection medium in cosmic ray sensors. These sensors are to be deployed in a remote location in Argentina. The purpose of this study is to provide information and preliminary analysis of available water treatment options and associated costs. This information, along with the technical requirements of the sensors, will allow the project team to determine the required water quality to meet the overall project goals.

  20. 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.

  1. RSA Study of Dimers

    E-print Network

    Michal Ciesla; Jakub Barbasz

    2012-05-17

    The first theoretical study of a dimer's adsorption process at homogenous surface is presented. By using the RSA algorithm, we show example monolayers, discuss estimations of random jamming coverage and measure the surface blocking function, which could be used for calculating real systems kinetics. We also found the correlation function for generated coverages and analyzed orientational ordering inside the adsorbed monolayer. Results were compared with theoretical and experimental data. Keywords: adsorption, RSA, monolayer, colloid particles

  2. Evolutionary Study of Phishing

    Microsoft Academic Search

    Danesh Irani; Steve Webb; Jonathon Giffin; Calton Pu

    2008-01-01

    Abstract—We study the evolution of phishing email messages in a corpus of over 380,000 phishing messages collected from August 2006 to December 2007. Our first result is a classification of phishing messages into two groups: flash attacks and non-flash attacks. Phishing message producers try to extend the usefulness of a phishing message by reusing the same message. In some cases

  3. Comics and American Studies

    E-print Network

    Levine, Stuart

    1980-01-01

    comics and american studies THE FAMILY UPSTAIRS: Introducing Krazy Kat (1910-12). By George Herriman. Introduction by Bill Blackbeard. Westport, Con­ necticut: Hyperion Press, Inc. 1977. $17.95. Paper: $8.95. ABIE THE AGENT (1914-15). By Harry... this journal receives articles on the comics and rejects them because our consultants find their authors knowledgeable and enthusiastic about their subject matter but inno­ cent of ways to make that knowledge useful to Americanists, Here are some ruminations...

  4. Winking Skull Study Aid

    NSDL National Science Digital Library

    Thieme Publishers (Thieme Publishers)

    2008-01-01

    WinkingSkull.com is a free, interactive resource for medical students and people interested in science. This website allows users to turn labels on or off while studying. A testing feature allows users to drag and drop labels onto the anatomical illustrations while being timed. Users may view test results instantly to measure their proficiency of the material and compare scores with other users.

  5. Electron microscope studies

    SciTech Connect

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

    1991-06-01

    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.

  6. ADVANCED CUTTINGS TRANSPORT STUDY

    SciTech Connect

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

    2002-04-30

    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.

  7. Energetic component treatability study

    SciTech Connect

    Gildea, P.D.; Brandon, S.L.; Brown, B.G. [and others

    1997-11-01

    The effectiveness of three environmentally sound processes for small energetic component disposal was examined experimentally in this study. The three destruction methods, batch reactor supercritical water oxidation, sodium hydroxide base hydrolysis and calcium carbonate cookoff were selected based on their potential for producing a clean solid residue and minimum release of toxic gases after component detonation. The explosive hazard was destroyed by all three processes. Batch supercritical water oxidation destroyed both the energetics and organics. Further development is desired to optimize process parameters. Sodium hydroxide base hydrolysis and calcium carbonate cookoff results indicated the potential for scrubbing gaseous detonation products. Further study and testing are needed to quantify the effectiveness of these later two processes for full-scale munition destruction. The preliminary experiments completed in this study have demonstrated the promise of these three processes as environmentally sound technologies for energetic component destruction. Continuation of these experimental programs is strongly recommended to optimize batch supercritical water oxidation processing, and to fully develop the sodium hydroxide base hydrolysis and calcium carbonate cookoff technologies.

  8. Cyprus Crustal Study Project

    NASA Astrophysics Data System (ADS)

    Hall, James M.

    The Cyprus Crustal Study Project is a joint venture of the International Crustal Research Drilling Group (ICRDG) and the Government of Cyprus through its Geological Survey Department. The aim of the project is to carry out a detailed reexamination of the Troodos, Cyprus, ophiolite, using high speed diamond drilling combined with extensive surface geological and geophysical studies. The ICRDG group, comprising about 100 geoscientists from eight countries, includes many participants familiar with ophiolites and with in situ ocean crust through work from Glomar Challenger, thus allowing the ophiolite to be viewed from a new perspective.Studies are being concentrated on a section through the north flank of the ophiolite between the villages of Agrokipia and Palekhori. Research drilling and associated mapping in this segment are aimed at providing a continuous sample through the upper 4 km of the ophiolite and at sampling the stockworks beneath the sulfide deposits located within the extrusive section. The Troodos massive sulfide deposits are considered to be close analogs of the deposited being formed by active hydrothermal circulation on the crest of the East Pacific Rise.

  9. Space telescope studies

    NASA Astrophysics Data System (ADS)

    Definition studies for the Advanced X Ray Astrophysics Facility (AXAF), an orbiting X ray telescope to be launched from the space shuttle in the early 1990s, have been initiated by NASA. The space agency selected two California aerospace companies—TRW and Lockheed Space and Missiles—to conduct the 2-year studies of spacecraft hardware and science instrument requirements, after which time one of the two will be awarded a contract to build the telescope.The AXAF facility will be the newest and most sophisticated in a series of X ray astronomical satellites dating back to the Uhuru satellite launched in 1970. Because the earth's atmosphere absorbs most incoming X ray radiation, telescopes sensitive to those wavelengths must be placed in orbit to be of value to astronomers. The AXAF will weigh ap- proximately 9000 kg and will measure 4.26×13 m. Orbiting the earth at an altitude of 515 km, it will carry a number of instruments suited to the study of astronomical X ray sources, among which are active galaxies and suspected black holes. The observatory is expected to see X ray sources 100 times fainter than those seen by the HEAO-2 (High Energy Astronomy Observatory) launched in 1978, and will represent a significant improvement over the European EXOSAT now in earth orbit, particularly in its long operational lifetime, which is now expected to be about 15 years.

  10. Modular reflector concept study

    NASA Technical Reports Server (NTRS)

    Vaughan, D. H.

    1981-01-01

    A study was conducted to evaluate the feasibility of space erecting a 100 meter paraboloidal radio frequency reflector by joining a number of individually deployed structural modules. Three module design concepts were considered: (1) the deployable cell module (DCM); (2) the modular paraboloidal erectable truss antenna (Mod-PETA); and (3) the modular erectable truss antenna (META). With the space shuttle (STS) as the launch system, the methodology of packaging and stowing in the orbiter, and of dispensing, deploying and joining, in orbit, were studied and the necessary support equipment identified. The structural performance of the completed reflectors was evaluated and their overall operational capability and feasibility were evaluated and compared. The potential of the three concepts to maintain stable shape in the space environment was determined. Their ability to operate at radio frequencies of 1 GHz and higher was assessed assuming the reflector surface to consist of a number of flat, hexagonal facets. A parametric study was performed to determine figure degradation as a function of reflector size, flat facet size, and f/D ratio.

  11. The safeguards options study

    SciTech Connect

    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

    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.

  12. ADVANCED CUTTINGS TRANSPORT STUDY

    SciTech Connect

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

    2002-01-30

    This is the second quarterly progress report for Year 3 of the ACTS project. It includes a review of progress made in: (1) Flow Loop development and (2) research tasks during the period of time between Oct 1, 2001 and Dec. 31, 2001. 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/Collection System), (b) Research project (Task 6): ''Study of Cuttings Transport with Foam Under LPAT Conditions (Joint Project with TUDRP)'', (c) Research project (Task 9): ''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 instrumentation tasks to measure: Cuttings concentration and distribution in a flowing slurry (Task 11), and Foam properties while transporting cuttings. (Task 12), (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). (g) Activities towards technology transfer and developing contacts with Petroleum and service company members, and increasing the number of JIP members.

  13. Geothermal Case Studies

    SciTech Connect

    Young, Katherine

    2014-09-30

    The US Geological Survey (USGS) resource assessment (Williams et al., 2009) outlined a mean 30GWe of undiscovered hydrothermal resource in the western US. One goal of the Geothermal Technologies Office (GTO) is to accelerate the development of this undiscovered resource. The Geothermal Technologies Program (GTP) Blue Ribbon Panel (GTO, 2011) recommended that DOE focus efforts on helping industry identify hidden geothermal resources to increase geothermal capacity in the near term. Increased exploration activity will produce more prospects, more discoveries, and more readily developable resources. Detailed exploration case studies akin to those found in oil and gas (e.g. Beaumont, et al, 1990) will give operators a single point of information to gather clean, unbiased information on which to build geothermal drilling prospects. To support this effort, the National Renewable Energy laboratory (NREL) has been working with the Department of Energy (DOE) to develop a template for geothermal case studies on the Geothermal Gateway on OpenEI. In fiscal year 2013, the template was developed and tested with two case studies: Raft River Geothermal Area (http://en.openei.org/wiki/Raft_River_Geothermal_Area) and Coso Geothermal Area (http://en.openei.org/wiki/Coso_Geothermal_Area). In fiscal year 2014, ten additional case studies were completed, and additional features were added to the template to allow for more data and the direct citations of data. The template allows for: Data - a variety of data can be collected for each area, including power production information, well field information, geologic information, reservoir information, and geochemistry information. Narratives ? general (e.g. area overview, history and infrastructure), technical (e.g. exploration history, well field description, R&D activities) and geologic narratives (e.g. area geology, hydrothermal system, heat source, geochemistry.) Exploration Activity Catalog - catalog of exploration activities conducted in the area (with dates and references.) NEPA Analysis ? a query of NEPA analyses conducted in the area (that have been catalogued in the OpenEI NEPA 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.

  14. Metropolitan Council Highway Transitway Corridor Study | Highway Transitway Corridor Study

    E-print Network

    Minnesota, University of

    Metropolitan Council Highway Transitway Corridor Study | Highway Transitway Corridor Study CTS Research Conference | May 21, 2014 1 #12;Metropolitan Council Highway Transitway Corridor Study | 2030 Transportation Policy Plan · Transitway modes on highways: ­ Highway bus rapid transit (BRT), plan identified 6

  15. Platform evolution studies

    NASA Technical Reports Server (NTRS)

    Walton, Barbara A.

    1990-01-01

    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.

  16. Environmental study of firefighters.

    PubMed

    Jankovic, J; Jones, W; Burkhart, J; Noonan, G

    1991-12-01

    A study of firefighter exposures was undertaken at the request of the U.S. Fire Administration. This work was part of a larger study which included field evaluation of the performance of the self-contained breathing apparatus (SCBA) worn by firefighters during structural firefighting. Measurements were made for a variety of contaminants including CO, CO2, benzene, HCN, HCl, H2SO4, HF, acrolein, CH4, formaldehyde and PNAs. Many of the analyses were performed by collection of bag samples followed by Fourier transform infrared spectroscopy using a field mobile spectrometer. Measurements were also made using solid sorbent tubes and direct-reading meters. Sampling was done both during the knockdown and during overhaul phases of structural firefighting. Also, in order to estimate exposures including those when the SCBAs were worn, measurements were made both inside and outside the SCBA facepiece. Carbon monoxide was the most common contaminant found during knockdown, and about 10% of the samples were greater than 1500 ppm. Formaldehyde, acrolein, hydrogen chloride, hydrogen cyanide, sulphuric acid and hydrogen fluoride all exceeded their respective short-term exposure limits (STEL) on some occasions. Approximately 50% of the knockdown samples for acrolein exceeded the STEL. During overhaul, when masks were usually not worn, many of the contaminants found during knockdown were detected, but typically at much lower concentrations. Inside-mask sampling data suggest that exposure to low concentrations of a variety of compounds is occurring but this is believed to be principally the result of early mask removal or of non-use during knockdown rather than of leakage. The three basic sampling approaches (bag sampling, sorbent tubes and direct-reading meters) proved in this study to be complementary and served to maximize our ability to detect and quantify a wide range of combustion products. PMID:1768008

  17. Rotating reactor studies

    NASA Technical Reports Server (NTRS)

    Roberts, Glyn O.

    1991-01-01

    Undesired gravitational effects such as convection or sedimentation in a fluid can sometimes be avoided or decreased by the use of a closed chamber uniformly rotated about a horizontal axis. In a previous study, the spiral orbits of a heavy or buoyant particle in a uniformly rotating fluid were determined. The particles move in circles, and spiral in or out under the combined effects of the centrifugal force and centrifugal buoyancy. A optimization problem for the rotation rate of a cylindrical reactor rotated about its axis and containing distributed particles was formulated and solved. Related studies in several areas are addressed. A computer program based on the analysis was upgraded by correcting some minor errors, adding a sophisticated screen-and-printer graphics capability and other output options, and by improving the automation. The design, performance, and analysis of a series of experiments with monodisperse polystyrene latex microspheres in water were supported to test the theory and its limitations. The theory was amply confirmed at high rotation rates. However, at low rotation rates (1 rpm or less) the assumption of uniform solid-body rotation of the fluid became invalid, and there were increasingly strong secondary motions driven by variations in the mean fluid density due to variations in the particle concentration. In these tests the increase in the mean fluid density due to the particles was of order 0.015 percent. To a first approximation, these flows are driven by the buoyancy in a thin crescent-shaped depleted layer on the descending side of the rotating reactor. This buoyancy distribution is balanced by viscosity near the walls, and by the Coriolis force in the interior. A full analysis is beyond the scope of this study. Secondary flows are likely to be stronger for buoyant particles, which spiral in towards the neutral point near the rotation axis under the influence of their centrifugal buoyancy. This is because the depleted layer is thicker and extends all the way around the reactor.

  18. Portable treatment systems study

    SciTech Connect

    Sherick, M.J.; Schwinkendorf, W.E.; Bechtold, T.E.; Cole, L.T.

    1997-03-01

    In developing their Site Treatment Plans (STPs), many of the Department of Energy installations identified some form of portable treatment, to facilitate compliant disposition of select mixed low-level wastestreams. The Environmental Management Office of Science and Technology requested that a systems study be performed to better define the potential role of portable treatment with respect to mixed low-level waste, highlight obstacles to implementation, and identify opportunities for future research and development emphasis. The study was performed by first establishing a representative set of mixed waste, then formulating portable treatment system concepts to meet the required processing needs for these wastes. The portable systems that were conceptualized were evaluated and compared to a fixed centralized treatment alternative. The system evaluations include a life-cycle cost analysis and an assessment of regulatory, institutional, and technical issues associated with the potential use of portable systems. The results of this study show that when all costs are included, there are no significant cost differences between portable systems and fixed systems. However, it is also emphasized that many uncertainties exist that could impact the cost of implementing portable treatment systems. Portable treatment could be made more attractive through private sector implementation, although there is little economic incentive for a commercial vendor to develop small, specialized treatment capabilities with limited applicability. Alternatively, there may also be valid reasons why fixed units cannot be used for some problematic wastestreams. In any event, there are some site-specific problems that still need to be addressed, and there may be some opportunity for research and development to make a positive impact in these areas.

  19. Protein Crystal Quality Studies

    NASA Technical Reports Server (NTRS)

    1998-01-01

    Eddie Snell (standing), Post-Doctoral Fellow the National Research Council (NRC),and Marc Pusey of Marshall Space Flight Center (MSFC) use a reciprocal space mapping diffractometer for marcromolecular crystal quality studies. The diffractometer is used in mapping the structure of marcromolecules such as proteins to determine their structure and thus understand how they function with other proteins in the body. This is one of several analytical tools used on proteins crystalized on Earth and in space experiments. Photo credit: NASA/Marshall Space Flight Center (MSFC)

  20. Studies in superfluid helium 

    E-print Network

    Larson, Elmer Virgil

    1969-01-01

    Larson, 8 A. , Concordia College; Directed by: Dr, Charles F. Squire Fourth sound was used to study ths hydrodynamic properties of liquid helium near 1 ' 5oK ~ Standing waves were sst up in e circular sound chaeber, which was packed with a 1 ' 0... micron alumina powder. A sharp resonance frequency varied in a regular and reproducible wey as the temperature decreased from 1 ' 498 to 1 ' 463oK. After the sound chamber was rotated at 100 rpm, 8 times the critical velocity, the resonance peak had...

  1. Pathology Case Study: Petechiae

    NSDL National Science Digital Library

    Lopez-Plaza, Iliana

    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.

  2. Pathology Case Study: Hyperammonemia

    NSDL National Science Digital Library

    Diven, Warren

    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.

  3. Magnetohydrodynamic generator experimental studies

    NASA Technical Reports Server (NTRS)

    Pierson, E. S.

    1972-01-01

    The results for an experimental study of a one wavelength MHD induction generator operating on a liquid flow are presented. First the design philosophy and the experimental generator design are summarized, including a description of the flow loop and instrumentation. Next a Fourier series method of treating the fact that the magnetic flux density produced by the stator is not a pure traveling sinusoid is described and some results summarized. This approach appears to be of interest after revisions are made, but the initial results are not accurate. Finally, some of the experimental data is summarized for various methods of excitation.

  4. 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 patientâ??s diagnosis is found in the â??Final 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 patientâ??s conditions. It is also a helpful site for educators to use to introduce or test student knowledge of neuropathology.

  5. Signature extension studies

    NASA Technical Reports Server (NTRS)

    Vincent, R. K.; Thomas, G. S.; Nalepka, R. F.

    1974-01-01

    The importance of specific spectral regions to signature extension is explored. In the recent past, the signature extension task was focused on the development of new techniques. Tested techniques are now used to investigate this spectral aspect of the large area survey. Sets of channels were sought which, for a given technique, were the least affected by several sources of variation over four data sets and yet provided good object class separation on each individual data set. Using sets of channels determined as part of this study, signature extension was accomplished between data sets collected over a six-day period and over a range of about 400 kilometers.

  6. 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.

  7. Pathology Case Study: Seizures

    NSDL National Science Digital Library

    Dickman, Paul S.

    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.

  8. Labyrinth: Medieval Studies

    NSDL National Science Digital Library

    The Labyrinth is a global information network providing free, organized access to electronic resources in medieval studies through a server at Georgetown University. The Labyrinth Library contains links to medieval texts as well as current research. The subject menus provide well-organized links to Internet resources in the respective subject areas. Because this is a web site that serves professionals as well as the interested public, there are pedagogical resources and professional information. The entire site is searchable, but is so well organized that most users will likely not find it necessary to do so. http://www.georgetown.edu/labyrinth/labyrinth-home.html

  9. Pathology Case Study: Fevers

    NSDL National Science Digital Library

    Kulich, Scott

    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 the health sciences field. In this case, a 68-year-old male patient experiencing fevers, chills, an associated non-productive cough, and weight loss was admitted to the hospital for examination. The â??Gross Description,â? â??Microscopic Description,â? and â?? Microbiologyâ? sections provide key information and images that contributed to the patientâ??s diagnosis. Clicking on the â??Final Diagnosisâ? provides a thorough explanation of the diagnosis and treatment from the contributing doctors.

  10. Nogales flood detention study

    USGS Publications Warehouse

    Norman, Laura M.; Levick, Lainie; Guertin, D. Phillip; Callegary, James; Guadarrama, Jesus Quintanar; Anaya, Claudia Zulema Gil; Prichard, Andrea; Gray, Floyd; Castellanos, Edgar; Tepezano, Edgar; Huth, Hans; Vandervoet, Prescott; Rodriguez, Saul; Nunez, Jose; Atwood, Donald; Granillo, Gilberto Patricio Olivero; Ceballos, Francisco Octavio Gastellum

    2010-01-01

    Flooding in Ambos Nogales often exceeds the capacity of the channel and adjacent land areas, endangering many people. The Nogales Wash is being studied to prevent future flood disasters and detention features are being installed in tributaries of the wash. This paper describes the application of the KINEROS2 model and efforts to understand the capacity of these detention features under various flood and urbanization scenarios. Results depict a reduction in peak flow for the 10-year, 1-hour event based on current land use in tributaries with detention features. However, model results also demonstrate that larger storm events and increasing urbanization will put a strain on the features and limit their effectiveness.

  11. Central American resource studies

    SciTech Connect

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

    1989-01-01

    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.

  12. Pathology Case Study: Hemoptysis

    NSDL National Science Digital Library

    Holst, Valerie

    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.

  13. Pathology Case Study: Peritonitis

    NSDL National Science Digital Library

    Nine, Jeff S.

    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.

  14. Pathology Case Study: Headache

    NSDL National Science Digital Library

    Nine, Jeff S.

    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.

  15. Mobile Bay turbidity study

    NASA Technical Reports Server (NTRS)

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

    1978-01-01

    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.

  16. MSFC MXER Tether Study

    NASA Technical Reports Server (NTRS)

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

    2003-01-01

    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.

  17. Luxembourg Employment Study

    NSDL National Science Digital Library

    Funded, in part, by the Human Capital and Mobility Programme of the European Commission and the Norwegian Research Council, the Luxembourg Employment Study (LES) is a searchable databank consisting of information mostly collected in the early 1990s by the Labour Force Surveys. Countries in North America and Europe with different labor market strategies were surveyed about areas of information including "job search, employment characteristics, comparable occupations, investment in education, migration, etc." Users may search the databank by country name, as well as by an extensive list of standardized variables. LES has also included detailed user instructions, working papers, a newsletter, and links to statistical information from the countries surveyed.

  18. Studies Relating to EVA

    NASA Technical Reports Server (NTRS)

    1997-01-01

    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.

  19. Space Station Spartan study

    NASA Technical Reports Server (NTRS)

    Lane, J. H.; Schulman, J. R.; Neupert, W. M.

    1985-01-01

    The required extension, enhancement, and upgrading of the present Spartan concept are described to conduct operations from the space station using the station's unique facilities and operational features. The space station Spartan (3S), the free flyer will be deployed from and returned to the space station and will conduct scientific missions of much longer duration than possible with the current Spartan. The potential benefits of a space station Spartan are enumerated. The objectives of the study are: (1) to develop a credible concept for a space station Spartan; and (2) to determine the associated requirements and interfaces with the space station to help ensure that the 3S can be properly accommodated.

  20. Contamination effects study

    NASA Technical Reports Server (NTRS)

    1988-01-01

    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.