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The properties of paramagnetic complexes formed by muonium located near acceptor and donor impurities in silicon are calculated using the quantum chemical methods. The calculated data are compared to the experimentally observed characteristics of normal and anomalous muonium centers. 相似文献
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Shock wave attenuation in partially confined channels 总被引:2,自引:0,他引:2
An approximate analytical solution is presented for the attenuation of planar shock waves in channels with perforated walls. The problem is considered as quasi-one-dimensional. Good agreement is found between the theoretical results and available experimental data regarding the rate of shock wave attenuation within the range of initial shock Mach numbers between 1.1 and 4 and perforation ratios between 4.5 × 10–3 and 0.53. A correlation for the discharge coefficient of a single hole perforation is presented which gives quantitatively good agreement with particular experimental observations.This article was processed using Springer-Verlag TEX Shock Waves macro package 1.0 and the AMS fonts, developed by the American Mathematical Society. 相似文献
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B. E. Gelfand A. M. Bartenev S. P. Medvedev A. N. Polenov S. V. Khomik M. Lenartz H. Grönig 《Shock Waves》1994,4(3):137-143
On the basis of numerical modeling specific features of shock wave reflections were analyzed. It was found, that after diaphragm rupture self-modeling pressure and velocity distributions nearby the shock front establish. But in some special cases the temperature behind the shock front can rise. This peculiarity should be taken into account when performing experiments with high reactive gaseous mixtures. The temperature on the shock front and the velocity gradient behind it are uniform in the case of strong blast wave reflections. This effect is observed in the zone with an elevated temperature profile behind the incident blast wave. The reflected triangular waves conserve a quasi-self-modeling character by pressure. Typical experiments were carried out to verify the theoretical predictions. The effects of reflected wave acceleration in the case of triangular waves and the self-similar character of the pressure profiles were observed.This article was processed using Springer-Verlag TEX Shock Waves macro package 1.0 and the AMS fonts, developed by the American Mathematical Society. 相似文献
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We introduce a criterion that a given bi-Hamiltonian structure admits a local coordinate system where both brackets have
constant coefficients. This criterion is applied to the bi-Hamiltonian open Toda lattice in a generic point, which is shown
to be locally isomorphic to a Kronecker odd-dimensional pair of brackets with constant coefficients. This shows that the open
Toda lattice cannot be locally represented as a product of two bi-Hamiltonian structures. Near, a generic point, the bi-Hamiltonian
periodic Toda lattice is shown to be isomorphic to a product of two open Toda lattices (one of which is a (trivial) structure
of dimension 1). While the above results might be obtained by more traditional methods, we use an approach based on general
results on geometry of webs. This demonstrates the possibility of applying a geometric language to problems on bi-Hamiltonian
integrable systems; such a possibility may be no less important than the particular results proved in this paper. Based on
these geometric approaches, we conjecture that decompositions similar to the decomposition of the periodic Toda lattice exist
in local geometry of the Volterra system, the complete Toda lattice, the multidimensional Euler top, and a regular bi-Hamiltonian
Lie coalgebra. We also state general conjectures about the geometry of more general "homogeneous" finite-dimensional bi-Hamiltonian
structures. The class of homogeneous structures is shown to coincide with the class of systems integrable by Lenard scheme.
The bi-Hamiltonian structures which admit a non-degenerate Lax structure are shown to be locally isomorphic to the open Toda
lattice. 相似文献
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The mass distributions obtained from a K?p experiment at 5.5 GeV/c are used to study the recent suggestion of an s-wave Kπ resonance at 1360 MeV. Using a model including s- and p- wave and , s-, p- and d-wave amplitudes, we analyze the spherical harmonic moments 〈Yl0〉 of the Kπ decay angular distribution in the K1 (1420) mass region and obtain the result that the reported mass of 1360 MeV does not necessarily represent the resonance position and is influenced by cuts made in the Kπ decay angle. 相似文献