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  • Artikel: DFG Deutsche Nationallizenzen  (2)
  • 1995-1999  (1)
  • 1990-1994  (1)
  • 1935-1939
  • 67.40.Vs  (1)
  • Vs  (1)
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  • Artikel: DFG Deutsche Nationallizenzen  (2)
Materialart
Erscheinungszeitraum
  • 1995-1999  (1)
  • 1990-1994  (1)
  • 1935-1939
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  • 1
    Digitale Medien
    Digitale Medien
    Energy transfer and phase slip by quantum vortex motion in superfluid4He (1993)
    Springer
    Journal of low temperature physics 93 (1993), S. 1003-1018 
    Details
    ISSN: 1573-7357
    Schlagwort(e): 67.40.Hf ; 67.40.Vs
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The purpose of the present article is to emphasize the usefulness of the ideas of E. R. Huggins in thinking about vortex motion and phase slip in superfluid4He, and is primarily pedagogical. Several explicit illustrations of vortex motion and phase-slip processes are considered. In addition, it is shown that Huggins's results lead to a generalization and a more complete understanding of the familiar expression E+vs · p for the energy in the rest system of an excitation in the flowing superfluid, as applied to vortex excitations. Here, E is the energy and p is the momentum of the excitation in the moving system, and vs is the superfluid velocity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00692045
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 2
    Digitale Medien
    Digitale Medien
    Studies of the critical velocity of superfluid4he in a 2 μm by 2 μm aperture in a thin foil at various frequencies (1995)
    Springer
    Journal of low temperature physics 101 (1995), S. 743-748 
    Details
    ISSN: 1573-7357
    Schlagwort(e): 67.40.Hf ; Vs
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Measurements of the critical velocity behavior of oscillatory superfluid4He flow through a 2 μm by 2 μm square aperture in a 0.1 μm thick titanium foil are being made at temperatures between 0.36 K and 2.1 K and at pressures of less than 0.4 bar at various frequencies between 50 Hz and 1000 Hz. The purpose of this work is to study a micron-size aperture for possible frequency-dependent deviations from the critical velocity behavior seen in submicron-size apertures. Preliminary results show a nearly linear decrease of critical velocity with increasing temperature that is similar to the temperature dependences seen in smaller apertures and that is approximately independent of frequency. However, at frequencies above 500 Hz, a region appears at the lowest temperatures in which supercritical behavior is dominated by large energy-loss events requiring a number of half-cycles for completion, a region that extends up to 1.1 K at 970 Hz.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00753384
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
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