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  • 1970-1974  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Bragg's influence on progress in optical computations (1970)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 26 (1970), S. 189-193 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: An attempt is made in this paper to indicate the impact that one small part of Sir Lawrence Bragg's gross contributions have had upon crystallography during his lifetime up to the age of eighty. The small part referred to is the growing field of optical computation. Since this paper is partly for the enlightenment of the reader as well as a salute to history, descriptions of five basic optical operations are given: I, addition; II, multiplication; III, reciprocation; IV, convolution and V, diffraction. The role of Bragg and his co-workers is woven into each description. Finally as an extrapolation, a further process is described: VI, inverse imaging.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739470000530
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    First- and second-order superconducting phase transitions of tin whiskers in a magnetic field (1972)
    Springer
    Journal of low temperature physics 6 (1972), S. 385-395 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using a sensitive inductance technique, first- and second-order phase transitions in tin (type I) whiskers have been observed in both parallel and perpendicular magnetic fields. ForT much less thanT c the samples exhibit considerable superheating and supercooling from which values of the Ginzburg-Landau parameter κ are calculated. However, these values are not as low as those obtained for single spheres (diameters 10–30 µ), probably due to mean free path and size effects. Close to the transition temperature it is observed that the hysteresis vanishes indicating the onset of a second-order phase transition. Good qualitative agreement between these results and theoretical predictions based on the Ginzburg-Landau theory are obtained. Size effects on the ratioH C3/H C2 ≡H SC /H C2 are clearly illustrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00628319
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    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
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00628416
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Quantum oscillations and reversible and irreversible superconducting phase transitions in indium microcylinders (1974)
    Springer
    Journal of low temperature physics 14 (1974), S. 607-626 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using a sensitive mutual inductance method, measurements of first- and second-order phase transitions in indium microcylinders (2.8–7.6 µm in diameter) have been made. Quantum oscillations in the supercooling field have been observed. The values of κ SC (T/T c )=κ1(T/T c ) derived fromH SC =H C3 have been corrected for both the temperature and the size dependence in the relationship betweenH c2 andH c3 . The results for κ1(T/T c ) from the 7.6-µm sample then agree reasonably well with the temperature dependence of κ1 observed for niobium. However, for the smallest cylinders anomalously low values of κ SC (T/T c ) were obtained nearT c . Very close to the transition temperature second-order (nonhysteretic) phase transitions have been observed and are interpreted in terms of the Ginzburg-Landau theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658884
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    Paper (German National Licenses)
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