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排序方式: 共有114条查询结果,搜索用时 15 毫秒
1.
Physics of Atomic Nuclei - We review some results of diagnostics for the electromagnetic characteristics of the heliosphere and of the Earth magnetosphere within the model for cosmic ray modulation... 相似文献
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For large Reynolds numbers, an asymptotic solution of the Navier-Stokes equations describing the effect of a thin longitudinal vortex with a constant circulation on the development of an incompressible steady two-dimensional laminar boundary layer on a flat plate is obtained. It is established that, in a narrow wall region extending along the vortex filament, the viscous flow is described by the 3-D boundary layer equations. A solution of these equations for small values of the vortex circulation is studied. It is found that the solution of the two-dimensional pre-separation boundary layer equations collapses. This is attributable to the singular behavior of the 3-D disturbances near the zero-longitudinal-friction points. 相似文献
4.
During the mixing of viscous incompressible flows with different velocities, in the vicinity of a trailing edge an interaction region with a three-layer structure is formed, similar to that in the case of symmetric shedding with equal velocities. The boundary layers developing on the upper and lower sides of the airfoil form a viscous mixing layer, or vortex sheet, which separates the flows downstream of the trailing edge. The boundary value problem corresponding to the flow in the viscous sublayer in the vicinity of the trailing edge of a flat plate is solved for high Reynolds numbers using an efficient numerical method for solving the equations of asymptotic interaction theory. 相似文献
5.
I. S. Rodina A. N. Kravtsova A. V. Soldatov A. J. Berry 《Optics and Spectroscopy》2011,111(6):936-939
The local atomic structure of titanium-containing forsterite is investigated based on analysis of X-ray absorption near-edge
structure (XANES) spectra. The Ti K-XANES spectra of the mineral under study are calculated for several possible structural models. Theoretical analysis of the
X-ray absorption spectra is performed based on the full-potential finite-difference method. The local geometry of the titanium
environment is determined by comparing the experimental Ti K-XANES spectrum with the theoretical spectra calculated for different structural models. The structural model where titanium
atoms substitute for silicon ones is found to be most likely for titanium-containing forsterite. The calculated partial densities
of electron states of titanium near the bottom of the conduction band of titanium-containing forsterite are analyzed. 相似文献
6.
B. A. Zhubanov A. A. Matnishyan V. D. Kravtsova M. B. Umerzakova R. M. Iskakov 《Russian Journal of Applied Chemistry》2011,84(11):1931-1935
Conducting composites based on an alicyclic polyimide and polyaniline doped with nonylnaphthalenesulfonic acid or with undoped
polyaniline were prepared. Their physicomechanical and electrical properties were studied. The accelerating effect of conducting
polymers on the polycondensation was demonstrated. 相似文献
7.
O. V. Kravtsova 《Russian Mathematics (Iz VUZ)》2016,60(9):7-22
We develop an approach to constructing and classification of semifield projective planes with the use of a linear space and a spread set. We construct a matrix representation of the spread set of a semifield plane of odd order that admits a Baer involution in the translation complement or a subgroup of autotopisms isomorphic to the alternating group A4. We give examples of semifield planes of order 81 satisfying the above indicated condition. 相似文献
8.
V. D. Kravtsova M. B. Umerzakova N. E. Korobova R. V. Sarieva 《Russian Journal of Applied Chemistry》2017,90(11):1833-1839
New film-forming metal-containing polymer compositions based on an alicyclic polyimide and on arylalicyclic copolyimides synthesized from tricyclodecene-, oxydiphenyl-, and benzophenonetetracarboxylic dianhydrides and oxydianiline in the presence of cobalt, nickel, iron, and copper salts in amide solvents were prepared, and their main properties were studied. Optimum synthesis conditions and compositions of metalcontaining composites with improved thermal, electrical, and other characteristics were found. The possibility of using the modified alicyclic polyimide films for fabricating integrated circuits by magnetron sputtering was examined. The samples prepared by sputtering of metals onto SPI-1 polyimide films with a chromium sublayer are characterized by high adhesion of the metal to the film surface. 相似文献
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A. V. Kostenko M. Feiters A. N. Kravtsova A. V. Soldatov 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2008,2(6):900-903
The existing model of the active center of bromoperoxidase protein, which has been obtained via x-ray diffraction methods, is defined more precisely. The processes occurring in the active center of this protein interacting with hydrogen peroxide are studied. It is shown that the existing model of the active center of bromoperoxidase is not sufficiently accurate. To study the adequacy of certain structural parameters of the active center, the atomic structure has been optimized using electron density functional theory. A new model of the active center of bromoperoxidase protein is proposed. 相似文献