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  • 1
    Digitale Medien
    Digitale Medien
    Presence and Function of Disclinations in Surface Coats of Unicellular Organisms (1971)
    [s.l.] : Nature Publishing Group
    Nature 232 (1971), S. 423-423 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The structure clearly contains a grain boundary which terminates in the visible part of the coat. Such a termination is a partial disclination. We can show that the visible part of the coat, including the two regions which have apparently been removed in preparation, contains just two disclinations ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/232423a0
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    A tin whisker with two independent superconducting phase diagrams (1971)
    Springer
    Journal of low temperature physics 5 (1971), S. 665-681 
    Details
    ISSN: 1573-7357
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Whiskers grown by extrusion from tin plate are known to have irregular cross sections; one such whisker could be regarded as a cylinder of approximately 2 µ in diameter, attached to which, with its plane parallel to the cylinder axis, was a thin film of an approximate thickness of 1000 Å. The superconducting transition of this whisker was studied resistively as a function of magnetic field, temperature, and elastic strain, and is interpreted in terms of two independent phase diagrams, one being attributed to the cylinder and one to the thin film; size effects are discussed. It seems that the cylinder and the thin film behaved as two separate systems in parallel, allowing, for example, the coexistence of a stable superconducting state in the film and a metastable normal state in the cylinder.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00628416
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  • 3
    Digitale Medien
    Digitale Medien
    Ginzburg-Landau analysis of first-order transitions of elastically strained superconducting tin whiskers (1983)
    Springer
    Journal of low temperature physics 53 (1983), S. 375-404 
    Details
    ISSN: 1573-7357
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A recently developed Ginzburg-Landau-type equation has been used to analyze measurements of the effect of stress on first-order superconducting transitions of tin whiskers. Assumptions were made as to the temperature dependence of the effective penetration depth and the validity of simple similarity. The analysis is in terms of three parameters of bulk tin. The critical temperature was measured directly at each stress. The other two parameters, namely the zero-temperature values of the critical field and the effective penetration depth, were computed at each stress by an optimization procedure. Combination of the three parameters gives a reasonable estimate of the average Fermi velocity but cannot reveal if this is stress-dependent. The critical temperature is known to increase linearly with stress along the tetragonal axis and quadratically at right angles to it, and the critical magnetic field is found to increase similarly at a slightly higher rate. The results are compared with those obtained for the same whiskers in the second-order region, and also with other measurements of related properties, such as the change in length of bulk single crystals at the superconducting transition.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00682485
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