排序方式: 共有41条查询结果,搜索用时 8 毫秒
31.
A.V. Kapustyan 《Journal of Mathematical Analysis and Applications》2009,357(1):254-466
We study the Kneser property (i.e. the compactness and connectedness for the attainability set of solutions) for a reaction-diffusion system including as a particular case the complex Ginzburg-Landau equation and the Lotka-Volterra system with diffusion. Using this property we obtain also that the global attractor of this system in both the autonomous and non-autonomous cases is connected. 相似文献
32.
We consider an autonomous evolution inclusion with pulse perturbations at fixed moments of time. Under the conditions of global solvability, we prove the existence of a minimal compact set in the phase space that attracts all trajectories. 相似文献
33.
For a wave equation, we determine an optimal control in the feedback form and prove the convergence of the constructed approximate control to the exact one. 相似文献
34.
We analyze one class of families of integral equations and describe the dependence of the singularities of solutions of integral equations on the dimensions of the families of kernels of equations. On the basis of these results, we propose procedures for the construction of approximate solutions for a small parameter. 相似文献
35.
We consider a class of parameterized operator inclusions with set-valued mappings of type. Sufficient conditions for the solvability of these inclusions are obtained and the dependence of the sets of their
solutions on functional parameters is investigated. Examples that illustrate the results obtained are given.
Translated from Ukrains’kyi Matematychnyi Zhurnal, Vol. 60, No. 12, pp. 1619–1630, December, 2008. 相似文献
36.
In this paper, we consider a reaction-diffusion equation with nonsmooth nonlinearity whose solutions have impulse effects
at fixed moments of time. We show how this object generates a nonautonomous multivalued dynamical system and prove the existence
of a compact semiinvariant global attractor in the phase space.
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Published in Neliniini Kolyvannya, Vol. 8, No. 3, pp. 319–328, July–September, 2005. 相似文献
37.
A.V. Kapustyan 《Journal of Differential Equations》2007,240(2):249-278
We study in this paper the asymptotic behaviour of the weak solutions of the three-dimensional Navier-Stokes equations. On the one hand, using the weak topology of the usual phase space H (of square integrable divergence free functions) we prove the existence of a weak attractor in both autonomous and nonautonomous cases. On the other, we obtain a conditional result about the existence of the strong attractor, which is valid under an unproved hypothesis. Also, with this hypothesis we obtain continuous weak solutions with respect to the strong topology of H. 相似文献
38.
Oleksiy V. Kapustyan Pavlo O. Kasyanov Roman M. Taranets 《Journal of Mathematical Analysis and Applications》2021,493(2):124562
We prove local and global in time existence of non-negative weak solutions to the thin-film equation with absorption and obtain sufficient conditions for extra regularity of these solutions. Moreover, for the class of global strong solutions, we show existence of a trajectory attractor. 相似文献
39.
E. A. Vinogradov G. I. Vinogradova V. I. Golovanov V. G. Veselago A. A. Mel’nikov A. V. Kapustyan A. A. Zhukov 《Physics of Wave Phenomena》2012,20(4):264-269
A design of the two-beam hybrid microwave interferometer for measuring refractive indices of metamaterials is described. It is based on the branching of radiation using a waveguide directional coupler. Radiations of the interferometer waveguide arms are summed and the phase disbalance of the interferometer arms is counted on the waveguide measuring line. The frequency dispersion of the negative refractive indices of the metamaterial samples with a variable distance between its constituent plates is experimentally investigated. A possibility of controlling the refractive index of a metamaterial is demonstrated. 相似文献
40.
From the point of view of singularities of differential mappings, we determine the dependence between the dimension of a family of singular equations and the types of singularities of their solutions. 相似文献