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排序方式: 共有96条查询结果,搜索用时 31 毫秒
1.
We establish constructive existence conditions and construct a generalized Green operator for the construction of solutions
of a Noetherian linear boundary-value problem for a system of ordinary differential equations with switchings and pulse action
in critical and noncritical cases.
__________
Translated from Neliniini Kolyvannya, Vol. 10, No. 1, pp. 51–65, January–March, 2007. 相似文献
2.
Conditions were found for facilitation of the conversion of nitrous oxide in the presence of Fe-containing zeolite catalysts
by oxidants (NO, SO2, and O2). The results were interpreted in the framework of a mechanism involving decomposition of N2O. The effect of NOx on the reduction of nitrous oxide by C3-C4 alkanes was established.
__________
Translated from Teoreticheskaya i éksperimental’naya Khimiya, Vol. 42, No. 4, pp. 241–245, July–August, 2006. 相似文献
3.
Russian Journal of Applied Chemistry - Supported binary indium–cobalt oxide catalysts showed high activity in joint reduction of nitrogen(I, II) oxides with carbon monoxide. Their activity is... 相似文献
4.
Ukrainian Mathematical Journal - We study bounded solutions of a nonlinear Lyapunov-type problem in Banach and Hilbert spaces. Necessary and sufficient conditions for the existence of bounded... 相似文献
5.
A.?S.?GeneralovEmail author A.?S.?Boichuk V.?V.?Murashov 《Polymer Science Series D》2013,6(2):143-147
Results of examinations of VKU-17KE0,1 carbon-fiber-reinforced plastic by the acousto-ultrasonic technique are presented here. The initial control parameters of samples produced with a variant ratio of basic components are determined, and the values of the stress wave factor (SWF) criterion, which is widely used in the United States, are calculated using the peak voltage, weighted ringdown count, and energy integral techniques. The power-spectrum technique proposed at VIAM was also involved in calculation. Correlations of SWF criterion and strength were determined during bending tests of carbon-fiber-reinforced samples. 相似文献
6.
The residual stress-strain state of a disk caused by the action of a laser pulse or an electron beam is investigated within
the framework of the dynamic statement of the coupled problem of thermomechanics. The axially symmetric problem is solved
numerically using the thermodynamically consistent theory of the inelastic behavior of the material involving the finite-element
method and taking into account temperature dependences of physical and mechanical characteristics of the material. The response
of the material to thermal irradiation followed by gradual cooling is studied, and the possibility of formation of surface
profiles with the use of only thermal treatment is considered.
Translated from Matematychni Metody ta Fizyko-Mekhanichni Polya, Vol. 51, No. 1, pp. 157–168, January–March, 2008. 相似文献
7.
We establish conditions under which solutions of weakly-perturbed systems of linear ordinary differential equations bounded on the entire axis R emerge from the point = 0 in the case where the corresponding unperturbed homogeneous linear differential system is exponentially dichotomous on the semiaxes R
+ and R
–. 相似文献
8.
9.
10.
V. V. Shevchenko M. A. Gumennaya A. V. Shevchuk Yu. P. Gomza N. S. Klimenko V. V. Boichuk 《Polymer Science Series B》2009,51(1-2):46-54
The interaction of oligomeric silsesquioxanes, whose organic moieties contain tertiary amino groups and primary and secondary hydroxyl groups, with monoisocyanates and phthalic and acetic anhydrides is employed to synthesize a number of their N-alkyl(aryl)urethane-, carboxyl- and acetyl-terminated derivatives with different degrees of substitution and combinations of the substituents. The obtained derivatives are studied by functional analysis, IR spectroscopy, GPC, DSC, TGA, and wide-angle X-ray scattering. The chemical nature of the incorporated functional groups is found to markedly influence the structure and properties of the synthesized compounds. Depending on the type of substituents and their combination, either the complete amorphization or ordering of the structure of the oligosilsesquioxanes is observed with corresponding changes in their properties. 相似文献