TAILIEUCHUNG - Báo cáo sinh học: " Research Article Periodic Systems Dependent on Parameters"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Research Article Periodic Systems Dependent on Parameters | Hindawi Publishing Corporation Journal of Inequalities and Applications Volume 2010 Article ID 796165 17 pages doi 2010 796165 Research Article Periodic Systems Dependent on Parameters Min He Department of Mathematical Sciences Kent State University at Trumbull Warren OH 44483 USA Correspondence should be addressed to Min He mhe@ Received 1 January 2010 Revised 5 March 2010 Accepted 14 March 2010 Academic Editor Shusen Ding Copyright 2010 Min He. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. This paper is concerned with a periodic system dependent on parameter. We study differentiability with respect to parameters of the periodic solution of the system. Applying a fixed point theorem and the results regarding parameters for c0-semigroups we obtained some convenient conditions for determining differentiability with parameters of the periodic solution. The paper is concluded with an application of the obtained results to a periodic boundary value problem. 1. Introduction One of the fundamental subjects in dynamic systems is the boundary value problem. When studying boundary value problems of differential and integrodifferential equations we often encounter the problems involving parameters. Take for example a periodic boundary value problem ut uxx for t 0 u x 0 u0 x for x e 0 1 k1u 0 t - h1ux 0 t f1 t ki hi 0 i 1 2 k2Ut 1 t h2Ux 1 0 fait ki hi 0 i 1 2 on the Banach space L2 0 1 where f1 t and f2 0 are both p-periodic and continuously differentiable. It appears that the boundary conditions contain four scalars k1 k2 h1 and h2. Because these scalars may vary as the environment of the system changes they are considered 2 Journal of Inequalities and Applications as parameters. Reforming for details see Sections we have the periodic boundary value problem wt wxx F t e k1 k2 h1 h2 e R4 .

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