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  • 1995-1999  (2)
  • 1990-1994  (1)
  • 1935-1939
  • 67.40.Vs  (1)
  • PACS. 47.20.-k Hydrodynamic stability - 47.54.+r Pattern selection; pattern formation - 71.55.-i Impurity and defect levels  (1)
  • Vs  (1)
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Years
  • 1995-1999  (2)
  • 1990-1994  (1)
  • 1935-1939
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    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
    Keywords: 67.40.Hf ; 67.40.Vs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692045
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    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
    Keywords: 67.40.Hf ; Vs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00753384
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Pattern formation in an inhomogeneous environment (1998)
    Springer
    The European physical journal 5 (1998), S. 757-770 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 47.20.-k Hydrodynamic stability - 47.54.+r Pattern selection; pattern formation - 71.55.-i Impurity and defect levels
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: A major step in understanding pattern formation has been achieved by studying idealized systems. However, in nature inhomogeneous systems are much more abundant than their idealized homogeneous counterparts. Here we report about experimental results on pattern formation in two inhomogeneous systems, thermal convection in porous media and Taylor-vortex flow between a rough and a smooth cylinder. Several aspects of heterogeneity effects in pattern formation are theoretically investigated for model equations and analytical descriptions are given for a few phenomena.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050500
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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