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101.
Jean-Pierre Eckmann Christina Forster Harald A. Posch Emmanuel Zabey 《Journal of statistical physics》2005,118(5-6):813-847
We consider simulations of a two-dimensional gas of hard disks in a rectangular container and study the Lyapunov spectrum near the vanishing Lyapunov exponents. To this spectrum are associated eigen-directions, called Lyapunov modes. We carefully analyze these modes and show how they are naturally associated with vector fields over the container. We also show that the Lyapunov exponents, and the coupled dynamics of the modes (where it exists) follow linear laws, whose coefficients only depend on the density of the gas, but not on aspect ratio and very little on the boundary conditions. 相似文献
102.
S.A. Karamian J.S. Forster J.U. Andersen W. Assmann C. Broude J. Chevallier J.S. Geiger F. Grüner V.A. Khodyrev F. Malaguti A. Uguzzoni 《The European Physical Journal A - Hadrons and Nuclei》2003,17(1):49-56
Crystal blocking lifetime measurements have been made for highly excited Th nuclei with neutron number well removed from the
stability line. Thin W crystals were bombarded with 32S ions in the energy range 170-180 MeV and the yield of fission fragments was measured for emission close to a 〈111〉 axis.
The fission blocking dips are compared to the appropriately scaled ones for elastic scattering of the 32S beam ions and no significant difference is seen between the dips. This implies that the fraction of nuclei fissioning with
lifetimes longer than 10 as is less than 2%. Fission lifetimes are increased by viscosity in the nuclear mass flow and comparison
with a statistical model calculation indicates that the viscosity parameter, η, must be lower than for Th and U nuclei near
β-stability. The effect of the N = 126 magic number is discussed.
Received: 2 October 2002 / Accepted: 16 January 2003 / Published online: 29 April 2003 相似文献
103.
104.
105.
J. Bak G. Melchart E. Uggerøj J.S. Forster P.R. Jensen H. Madsbøll S.P. Møller H. Nielsen G. Petersen H. Schiøtt J.J. Grob P. Siffert 《Physics letters. [Part B]》1980,93(4):505-508
A very strong and dramatic bending effect has been found for 12 GeV/c positive particles channeled along crystal axes and planes. For a combination of axial and planar channeling the bending efficiency is 5–10%. The maximum bending angle was 52 mrad obtained over a 20 mm long 〈111〉 Si-crystal. The axial channeling is also able to bend negative particles. 相似文献
106.
107.
In 1960, H. Grauert proved the following coherence theorem [2]: Let X, Y be complex spaces and : X Y a proper holomorphic map. Then, for every coherent analytic sheaf J on X, all direct image sheaves Rn*J are coherent. We give a new proof of this theorem, based on ideas of B. Malgrange. This proof does not use induction on the dimension of the base space Y and can be generalized to relative-analytic spaces X Y where Y belongs to a bigger category of ringed spaces, which contains in particular all complex spaces and differentiable manifolds. 相似文献
108.
109.
Otto Forster 《Mathematische Zeitschrift》1964,84(1):80-87
Ohne Zusammenfassung 相似文献
110.