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  • 1
    Electronic Resource
    Electronic Resource
    Potentiation of γ-Aminobutyric Acid-Mediated Chloride Flux by Pentobarbital and Diazepam but Not Ethanol (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 58 (1992), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: The influx of 36Cl- into cerebral cortical and cerebellar microsacs from ICR mice and Sprague-Dawley rats was studied in incubations lasting 3 s, 500 ms, or 21 ms. In the 3-s assay, 10-40 mM ethanol did not affect either basal or γ-arninobutyric acid (GABA)-mediated Cl- flux, at any GABA concentration tested. Only at a concentration of 600 mM did ethanol potentiate Cl- flux in both mouse and rat preparations. Ethanol (20 mM) also did not affect the significant potentiation of GABA-mediated flux produced by 50 γM pentobarbital or 2 γM diazepam in ICR mouse microsacs. In 21- and 500-ms incubations (quench-flow method), 50 γM pentobarbital significantly potentiated GABA-mediated Cl- flux in rat cortical microsacs, but 10-50 mM ethanol did not. These studies suggest that some as yet unrecognized factor is essential for ethanol enhancement of GABA-mediated Cl- flux, as reported by others in brain homogenates and in tissue culture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-4159.1992.tb09781.x
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  • 2
    Electronic Resource
    Electronic Resource
    Harmonic mixing at mm waveband in a high temperature superconducting grain boundary Josephson junction (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 2286-2288 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using a high Tc superconducting grain boundary Josephson junction, harmonic mixing experiments in the mm waveband were carried out, aiming at as large a harmonic number and as high a signal frequency as possible. The dependencies of intermediate frequency output on dc bias, harmonic number, frequency of local oscillator (LO), and other parameters were carefully studied. Until now, our best result was the mixing between the signal at 95 GHz and the 105th harmonic of LO at about 900 MHz. Preliminary experiments using a high Tc harmonic mixer and phase-locking loop were tried to stabilize the frequency of a mm wave source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356293
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  • 3
    Electronic Resource
    Electronic Resource
    Electrostatic and van der Waals Contributions to Protein Adsorption: 2. Modeling of Ordered Arrays (1994)
    s.l. : American Chemical Society
    Langmuir 10 (1994), S. 3705-3713 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00022a052
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  • 4
    Electronic Resource
    Electronic Resource
    Calculations of the microwave conductivity of high-Tc superconducting thin films from power transmission measurements (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 5550-5553 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: To calculate the complex conductivity σ=σ1−jσ2, and thus the surface resistance Rs and penetration depth λL, of high Tc superconducting thin films from microwave power transmission measurements, new expressions are derived taking into account the film thickness. Numerical examples are given to show that, compared with the calculations which neglect the film thickness, corrections in σ1, σ2, Rs, and λL are a few percent for film thickness ranging between 0.65 and 0.46 λL and that corrections in σ1 and σ2 are greater than those in Rs and λL. Using the newly derived expressions, maximum errors in Rs and λL are estimated to be about 30% and 3%, respectively, if errors between −10% and +10% are tolerated in the measurements of the magnitude and phase shift of microwave transmission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350530
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  • 5
    Electronic Resource
    Electronic Resource
    Numerical calculation of the height of velocity-matching step of flux-flow type Josephson oscillator (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 4703-4709 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The height of the velocity-matching step (VM step) of a flux-flow type Josephson oscillator is studied systematically by numerical simulations. It is defined by the phase velocity of the propagating fluxons equaling that of the electromagnetic wave in the junction structure. The height of VM step (γm) is an important parameter for the practical application of such a device. The results presented on γm are important data in order to save computer time in the simulation of electromagnetic properties, such as the output voltage, at the velocity-matching condition. The detailed simulations were performed using the perturbed sine-Gordon equation (PSGE) with a uniformly distributed bias current γ. The PSGE was solved numerically by using an implicit finite-difference scheme. The distributions of electromagnetic fields in an overlap, long Josephson junction in the flux-flow state are mapped. The parameters influencing γm are discussed. We show that γm increases almost linearly with an external magnetic field βe or with the quasiparticle damping α, while it is less dependent on surface loss β. γm increases slowly with junction length above a minimum length, and it levels out at long lengths. We also present an approximate expression for γm which fits numerical results well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346150
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  • 6
    Electronic Resource
    Electronic Resource
    Spatial variation of the critical current density of the high Tc superconducting thin films (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 5350-5353 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low-temperature scanning electron microscopy (LTSEM) is a promising measuring technique for probing the spatial distribution of the superconducting properties of high Tc thin films. In the presented article we have given some experimental observations on the spatial variation of the critical current density of two kinds of high Tc thin films using a LTSEM. The results show that in the polycrystalline TlBaCaCuO film prepared by dc magnetron sputtering, the maximum local critical current density is about 3–4 times greater than the minimum local critical current density. The microstructure analysis implies that the strong inhomogeneous critical current density distribution in the TlBaCaCuO film is due to its granular structures and the existence of several structural phases. For c-axis oriented epitaxial YBaCuO thin film deposited in situ by laser ablation, the results indicate a less inhomogeneous critical current density distribution. The maximum local critical current density is less than 1.5 times the minimum local critical current density in the epitaxial thin film.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351972
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  • 7
    Electronic Resource
    Electronic Resource
    In situ formation of Y-Ba-Cu-O epitaxial films by 40.68-MHz rf magnetron sputtering (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 2731-2733 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The in situ epitaxial growth of the Y-Ba-Cu-O films on MgO (001) was carried out by 40.68- MHz rf magnetron sputtering with an on-axis single target. It appeared that the rf discharge strongly affected film composition, crystallinity, superconductivity, and reproducibility. Highly orientated superconducting films with the c-axis perpendicular to the substrate surfaces and having zero resistance transition temperature of 78.2 K were obtained without a post-annealing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348628
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  • 8
    Electronic Resource
    Electronic Resource
    The growth and characterization of Pb-doped Bi-Sr-Ca-Cu-O thin films (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 2657-2660 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The growth and characterization of Bi-Pb-Sr-Ca-Cu-O films on single-crystal (001)MgO substrates by rf magnetron sputtering with a single target are reported. The comparison of different post-annealing conditions revealed that the film annealed under controlled Pb potential gave best superconducting properties with Tc0 above 105 K. The proper doping of Pb not only accelerated the formation of the high-Tc phase, but also improved the connectivity of high-Tc grains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345477
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  • 9
    Electronic Resource
    Electronic Resource
    Up to the 51st harmonic mixing in YBa2Cu3O7−y weak link operated in liquid nitrogen (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 1265-1267 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: When a signal at the nominal frequency of 76 GHz and a local oscillation (LO) at the frequency of a few gigahertz were both applied to a YBa2Cu3O7−y weak link immersed in liquid nitrogen, the former mixed with the harmonics of the latter giving rise to output at the intermediate frequency (IF) of about 150 MHz. The highest observed harmonic number was 51. Without exhaustive effort to optimize, the typical IF output power referred to the mixer output ranged between −103 and −112 dbm while the IF signal-to-noise ratio ranged between 16 and 4 db, depending strongly on the local oscillation power, the dc bias current, and the signal power. Reported in this letter are the experimental details as well as the requirements for a superconducting weak link to be a harmonic mixer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104229
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  • 10
    Electronic Resource
    Electronic Resource
    High transport critical currents and flux jumps in bulk YBa2Cu3Ox superconductors (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 2675-2677 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A preferentially oriented bulk YBa2Cu3Ox superconductor was prepared by the liquid phase method. A continuous dc current carrying capacity exceeding 120 A with current density higher than 37 300 A/cm2 at 77 K has been obtained. The high current effects causing fracture of the sample were studied in relation to the thermal diffusion properties. In magnetization measurements, flux jumps were observed for currents in the sample a-b plane below the temperature of about 20 K. The jumps are more closely spaced with decreasing temperature or increasing field sweep rates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103267
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