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  • Digitale Medien  (3)
  • 2000-2004  (3)
  • 1985-1989
  • 2002  (3)
  • PACS. 45.70.-n Granular systems – 47.54.+r Pattern selection; pattern formation  (2)
  • PACS. 02.50.-r Probability theory, stochastic processes, and statistics – 05.20.-y Classical statistical mechanics – 05.30.-d Quantum statistical mechanics – 05.70.-a Thermodynamics  (1)
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Materialart
  • Digitale Medien  (3)
Erscheinungszeitraum
  • 2000-2004  (3)
  • 1985-1989
Jahr
  • 2002  (3)
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Selection of dune shapes and velocities Part 1: Dynamics of sand, wind and barchans (2002)
    Springer
    The European physical journal 28 (2002), S. 321-339 
    Details
    ISSN: 1434-6036
    Schlagwort(e): PACS. 45.70.-n Granular systems – 47.54.+r Pattern selection; pattern formation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: Almost fifty years of investigations of barchan dunes morphology and dynamics is reviewed, with emphasis on the physical understanding of these objects. The characteristic quantities measured on the field (shape, size, velocity) and the physical problems they rise are presented. Then, we review the dynamical mechanisms explaining the formation and the propagation of dunes. In particular a complete and original approach of the sand transport over a flat sand bed is proposed and discussed. We conclude on open problems by outlining future research directions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjb/e2002-00236-4
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  • 2
    Digitale Medien
    Digitale Medien
    Selection of dune shapes and velocities Part 2: A two-dimensional modelling (2002)
    Springer
    The European physical journal 28 (2002), S. 341-352 
    Details
    ISSN: 1434-6036
    Schlagwort(e): PACS. 45.70.-n Granular systems – 47.54.+r Pattern selection; pattern formation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: We present in this paper a simplification of the dune model proposed by Sauermann et al. which keeps the basic mechanisms but allows analytical and parametric studies. Two kinds of purely propagative two dimensional solutions are exhibited: dunes and domes. The latter, by contrast to the former, do not present a slip face. Their shape and velocity can be predicted as a function of their size. We recover that dune profiles are not scale invariant (small dunes are flatter than the large ones), and that the inverse of the velocity grows almost linearly with the dune size. We furthermore get the existence of a critical mass below which no dune solution exists. It rises the problem of dune nucleation: how can dunes appear if any bump below this minimal mass gets eroded and disappears? The linear stability analysis of a flat sand bed shows that it is unstable at large wavelengths: dune can in fact nucleate from a small sand mass if the proto-dune is sufficiently long.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjb/e2002-00237-3
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Nonextensive statistics and incomplete information (2002)
    Springer
    The European physical journal 26 (2002), S. 357-368 
    Details
    ISSN: 1434-6036
    Schlagwort(e): PACS. 02.50.-r Probability theory, stochastic processes, and statistics – 05.20.-y Classical statistical mechanics – 05.30.-d Quantum statistical mechanics – 05.70.-a Thermodynamics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: We comment on some open questions and theoretical peculiarities in Tsallis nonextensive statistical mechanics. It is shown that the theoretical basis of the successful Tsallis' generalized exponential distribution shows some worrying properties with the conventional normalization and the escort probability. These theoretical difficulties may be avoided by introducing an so called incomplete normalization allowing to deduce Tsallis' generalized distribution in a more convincing and consistent way.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjb/e20020100
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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