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  • Articles  (6)
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  • Springer  (6)
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  • 1990-1994  (6)
  • 1965-1969
  • 1990  (6)
  • Physics  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Electromagnetic properties of electrophoretic YBa2Cu3O7−δ films (1990)
    Springer
    Journal of superconductivity 3 (1990), S. 323-329 
    Details
    ISSN: 1572-9605
    Keywords: Y1Ba2Cu3O7−δ ; electrophoretic films ; grain aligned
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract In order to apply highT c superconductivity to general microwave cavities and to shielding devices for quasistationary magnetic fields, we have developed an electrophoretic coating technique. This work reports about the continuation of our experiments. More than 60 samples of electrophoretic layers deposited on silver substrates were fabricated by systematically varying the processing parameters. The r.f. surface resistance measured at 21.5 GHz and 77 K at low excitation fields is found to be a sensitive measure of the quality of the samples and falls rapidly with increasing average grain size. Textured electrophoretic layers of large grain size show the smallest sensitivity ofR s against the r.f. surface magnetic fieldH s. The magnetic sensitivitydR s /dH s is found to be in direct proportion toR s (77 K). After optimizing the sintering procedure the electrodes of the prototype cavity for a compact hydrogen maser were coated. The cavity was successfully operated at 1.42 GHz, and a surface resistance of 1 mΩ was achieved at 77 K. This compares to 4 mΩ for copper at the same temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00625275
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  • 2
    Electronic Resource
    Electronic Resource
    Ribonucleoparticle-independent transport of proteins into mammalian microsomes (1990)
    Springer
    Journal of bioenergetics and biomembranes 22 (1990), S. 711-723 
    Details
    ISSN: 1573-6881
    Keywords: Mammalian endoplasmic reticulum ; prepromelittin ; prepropeptide GLa ; preprocecropin A ; M13 procoat protein ; protein transport
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Physics
    Notes: Abstract There are at least two different mechanisms for the transport of secretory proteins into the mammalian endoplasmic reticulum. Both mechanisms depend on the presence of a signal peptide on the respective precursor protein and involve a signal peptide receptor on the cis-side and signal peptidase on the trans-side of the membrane. Furthermore, both mechanisms involve a membrane component with a cytoplasmically exposed sulfhydryl. The decisive feature of the precursor protein with respect to which of the two mechanisms is used is the chain length of the polypeptide. The critical size seems to be around 70 amino acid residues (including the signal peptide). The one mechanism is used by precursor proteins larger than about 70 amino acid residues and involves two cytosolic ribonucleoparticles and their receptors on the microsomal surface. The other one is used by small precursor proteins and relies on the mature part within the precursor molecule and a cytosolic ATPase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00786927
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  • 3
    Electronic Resource
    Electronic Resource
    Quantitative investigation of thermal phonon pulses in sapphire, silicon, and quartz (1990)
    Springer
    The European physical journal 80 (1990), S. 25-38 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper we present reflection experiments with thermal phonon pulses at bare crystal surfaces of a-cut sapphire, [111]-cut silicon,X-cut quartz andZ-cut quartz. The observed bolometer signals are compared with an adequate rigorous model calculation. The parameters for the phonon-detection properties of the used superconducting bolometer are taken from a preceding paper which is devoted to the phonon transmission in the same crystal, measured with the same experimental setup. An attempt is made to investigate also for the first time quantitatively the strong background signal which is mainly due to scattering from isotopes and other crystal defects but contains also contributions from phonon-phonon scattering as is shown by a detailed investigation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01390649
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  • 4
    Electronic Resource
    Electronic Resource
    Quantitative investigation of thermal phonon pulses in sapphire, silicon, and quartz (1990)
    Springer
    The European physical journal 80 (1990), S. 15-23 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using pulse-heated constantan films as a thermal phonon radiator and superconducting tin bolometer as a phonon detector, we present for the first time a full quantitative comparison between observed bolometer signals and adequate rigorous model calculations for transmission experiments ina-cut sapphire, [111]-cut silicon, as well asX-cut quartz andZ-cut quartz. Details of the observed phonon signals are explained and understood. From these experiments, we are also able to extract information about the phonon absorption coefficient in the normal state of the polycrystalline tin bolometer for longitudinal and transverse polarized phonons in quantitative agreement with an earlier experiment ina-cut sapphire which was performed with a superconducting tunnel junction as a detector. The observed transmission signals can be explained for sapphire and silicon by ballistic propagation with additional small angle scattering, but for quartz strong frequency downconversion occurs for phonons with frequencies above half a Terahertz. In a succeding paper (Part II) the parameter deduced from the transmission experiment are applied to the analysis of the observed phonon signals in reflection experiments in the same crystals under the same conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01390648
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  • 5
    Electronic Resource
    Electronic Resource
    Survey of microwave surface impedance data of high-T c superconductors—Evidence for nonpairing charge carriers (1990)
    Springer
    Journal of superconductivity 3 (1990), S. 235-242 
    Details
    ISSN: 1572-9605
    Keywords: YBa2Cu3O7−δ ; microwave ; surface resistance ; penetration depth ; two-fluid model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The microwave surface impedance of the high-T c oxide superconductors has been measured at many laboratories around the world. A survey of their data between 100 MHz and 150 GHz for polycrystalline as well as single crystalline samples is given, focusing on YBa2Cu3O7−δ . In comparison to the classical superconductors, these results reveal a very similar temperature dependence of the surface impedance close toT c but an anomalous high residual surface resistance at lower temperatures. Both features can be explained by the assumption that oxide superconductors contain a significant number of nonpairing charge carriers. Within the framework of a properly extended two-fluid model, this is shown by analysis of our best thin-film data. Moreover, the enhanced losses in polycrystalline material especially for superposed magnetostatic fields result, to a large extent, from the deeper penetration depth. The possible origin of the nonpairing charge carriers and their impact on the applicability of the oxide superconductors is briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00625263
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  • 6
    Electronic Resource
    Electronic Resource
    High dose iron implantation into silicon and metals (1990)
    Springer
    Hyperfine interactions 56 (1990), S. 1627-1635 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High dose implantations of Fe into metals and semiconductors have been performed with beam energies up to 1 MeV at the UNILAC-injector at GSI. Unusual high concentrations of 70 atomic % for Si and 20 atomic % for Cu have been obtained, with doses of 1018 Fe/cm2 in the case of Si and several 1017 Fe/cm2 in the case of Cu. For Si the thickness of the layers were determined by Rutherford backscattering to be 4500 Å. These results are consistent with calculations, which show that these high concentrations are due to the reduction of the sputter yield at the relative high particle energies. Samples have been characterized using several complementary methods (Mössbauer Spectroscopy (MS), Rutherford Backscattering Spectroscopy (RBS), Auger electron Spectroscopy (AES). Scanning Electron Microscopy (SEM), X-ray diffraction (XRD)).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02405485
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