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排序方式: 共有150条查询结果,搜索用时 440 毫秒
31.
V. A. Makarov V. M. Petnikova P. S. Ryzhikov V. V. Shuvalov A. V. Yadvichuk 《Physics of Wave Phenomena》2017,25(1):20-23
A particular analytical solution to the nonintegrable problem of plane electromagnetic wave propagation through an isotropic gyrotropic nonlinear medium is found in the form of elliptically polarized breather. The intensity ratio for the circularly polarized components of this wave, which remains constant during propagation, can be used to determine the ratio of local and nonlocal nonlinear susceptibilities describing the Kerr nonlinearity and its spatial dispersion. 相似文献
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Kolesnikova Inna N. Rykov Anatolii N. Shuvalov Maxim V. Shishkov Igor F. 《Structural chemistry》2019,30(5):1993-2001
Structural Chemistry - The molecular structure of thiosalicylamide (2-hydroxythiobenzamide) was investigated in the gas phase at 401 K by means of gas electron diffraction (GED) combined... 相似文献
34.
Podrugina T. A. Pavlova A. S. Vinogradov D. S. Shuvalov M. V. Potapov I. D. Levina I. I. Mironov A. V. Gleiter R. 《Russian Chemical Bulletin》2019,68(2):284-292
Russian Chemical Bulletin - The reactions of mixed ylides containing a diazonium fragment and an "onium" group of different nature with nucleophiles were studied. In the... 相似文献
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On the quasistatic effective elastic moduli for elastic waves in three-dimensional phononic crystals
Effective elastic moduli for 3D solid–solid phononic crystals of arbitrary anisotropy and oblique lattice structure are formulated analytically using the plane-wave expansion (PWE) method and the recently proposed monodromy-matrix (MM) method. The latter approach employs Fourier series in two dimensions with direct numerical integration along the third direction. As a result, the MM method converges much quicker to the exact moduli in comparison with the PWE as the number of Fourier coefficients increases. The MM method yields a more explicit formula than previous results, enabling a closed-form upper bound on the effective Christoffel tensor. The MM approach significantly improves the efficiency and accuracy of evaluating effective wave speeds for high-contrast composites and for configurations of closely spaced inclusions, as demonstrated by three-dimensional examples. 相似文献
38.
A thin-walled cylinder of unrestricted anisotropy is considered. Low-frequency cutoffs corresponding to bending and extension-shear motions of the cylinder mid-surface are investigated. Their explicit approximations are found by two different methods: truncating the Peano series in the exact dispersion relation and using the Kirchhoff-Love theory of shells adapted to a generally anisotropic cylinder. 相似文献
39.
V.V. Shuvalov 《Shock Waves》1999,9(6):381-390
Eulerian, three-dimensional, numerical code, which conserves mass, momentum and energy simultaneously both in the Lagrangian
and remap steps, is developed. The use of special form of linear viscosity provides a weaker time step restriction as compared
with the Courant condition. The code is designed to investigate the multi-material problems, including dusty flows. The performance
of the code is illustrated by the modeling of shock wave interaction with a dusty thermal layer.
Received 15 June 1998/ Accepted 6 January 1999 相似文献
40.
Robert R. Shuvalov Peter C. Burns 《Acta Crystallographica. Section C, Structural Chemistry》2003,59(6):i47-i49
The crystal structure of H3BO3‐3T, a new trigonal polytype of orthoboric acid, consists of sheets of hydrogen‐bonded B(OH)3 molecules similar to those found in the triclinic structure of orthoboric acid, H3BO3‐2A. In each case, van der Waals forces connect the sheets. However, the stacking sequences of the sheets differ between the two polymorphs. In H3BO3‐3T (space group P32), the sheets are stacked in the repeating sequence ABC…, whereas in H3BO3‐2A (space group ), the sheets are stacked in the repeating sequence AB…. 相似文献