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  • Electronic Resource  (4)
  • Loose Leaf
  • 2000-2004  (4)
  • 1990-1994
  • 2002  (4)
  • PACS. 45.70.-n Granular systems – 47.54.+r Pattern selection; pattern formation  (2)
  • PACS. 89.75.Hc Networks and genealogical trees – 05.50.+q Lattice theory and statistics (Ising, Potts, etc.) – 87.23.Ge Dynamics of social systems  (2)
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  • Electronic Resource  (4)
  • Loose Leaf
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  • 2000-2004  (4)
  • 1990-1994
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  • 2002  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    The September 11 attack: A percolation of individual passive support (2002)
    Springer
    The European physical journal 26 (2002), S. 269-272 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 89.75.Hc Networks and genealogical trees – 05.50.+q Lattice theory and statistics (Ising, Potts, etc.) – 87.23.Ge Dynamics of social systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: A model to terrorism is presented using the theory of percolation. Terrorism power is related to the spontaneous formation of random backbones of people who are sympathetic to terrorism but without being directly involved in it. They just don't oppose in case they could. In the past such friendly-to-terrorism backbones have been always existing but were of finite size and localized to a given geographical area. The September 11 terrorist attack on the US has revealed for the first time the existence of a world wide spread extension. It is argued to have result from a sudden world percolation of otherwise unconnected and dormant world spread backbones of passive supporters. The associated strategic question is then to determine if collecting ground information could have predict and thus avoid such a transition. Our results show the answer is no, voiding the major criticism against intelligence services. To conclude the impact of military action is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e20020089
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Minority opinion spreading in random geometry (2002)
    Springer
    The European physical journal 25 (2002), S. 403-406 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 89.75.Hc Networks and genealogical trees – 05.50.+q Lattice theory and statistics (Ising, Potts, etc.) – 87.23.Ge Dynamics of social systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The dynamics of spreading of the minority opinion in public debates (a reform proposal, a behavior change, a military retaliation) is studied using a diffusion reaction model. People move by discrete step on a landscape of random geometry shaped by social life (offices, houses, bars, and restaurants). A perfect world is considered with no advantage to the minority. A one person-one argument principle is applied to determine locally individual mind changes. In case of equality, a collective doubt is evoked which in turn favors the Status Quo. Starting from a large in favor of the proposal initial majority, repeated random size local discussions are found to drive the majority reversal along the minority hostile view. Total opinion refusal is completed within few days. Recent national collective issues are revisited. The model may apply to rumor and fear propagation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e20020045
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    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
    Keywords: PACS. 45.70.-n Granular systems – 47.54.+r Pattern selection; pattern formation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2002-00236-4
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    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
    Keywords: PACS. 45.70.-n Granular systems – 47.54.+r Pattern selection; pattern formation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2002-00237-3
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    Paper (German National Licenses)
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