非局部反应扩散方程奇摄动问题

本文研究了一类具有非局部初始条件的奇摄动反应扩散问题．在适当的条件下，利用比较定理讨论了问题解的渐近性态．     

具有非局部边界条件的奇摄动反应扩散问题

本文研究了一类具有非局部边界条件的奇摄动反应扩散初始边值问题．在适当的条件下，利用比较定理讨论了问题解的渐近性态．     

反应扩散方程的奇摄动

§ 1　 IntroductionThe nonlinearsingularly perturbed problem is a very attractive subjectof study in theinternational academic circles[1 ] .During the past decade many approximate methods havebeen developed and refined,including the method of average,boundary layer method,matched asymptotic expansions,and multiple scales.Recently,many scholars,for example,Bohé[2 ] ,Butuzov and Smurov[3] ,O Malley[4] ,Butuzov,Nefedov and Schneider[5] ,Kelley[6]and so on did a great deal of work.Mo consider…     

A KIND OF NONLOCAL PROBLEMS FOR SINGULARLY PERTURBED REACTION DIFFUSION SYSTEMS

1991MRSubjectClassification35B2535K57Theauthorsstudiedakilldofsingularlypertllrbedproblemsin[1]-[61.Nowwe't()llsiderthefollowingsingularlyperturbedproblemforthenonlocalboulldaryconditionsouteof~Li'Ui=.fi(X,.UljUZj'',JINN,~),0相似文献   

一类具有非局部边界条件的半线性椭圆型方程奇摄动问题

本文研究了一类具有非局部边界条件的奇摄动半线性椭圆型方程边值问题。在适当的条件下，利用比较定理讨论了问题解的渐近性态。     

Extremality and comparison results for discontinuous implicit third order functional initial-boundary value problems

Extremality results are derived for implicit third order functional initial-boundary value problems. Differential equations, initial conditions and boundary conditions of problems may involve discontinuous nonlinearities.     

Variation formulas of solutions and optimal control problems for differential equations with retarded argument

The authors prove a theorem on the continuous dependence of solutions of nonlinear systems of differential equations with variable delay on the perturbations of initial data (initial instant, initial function, and initial value of the trajectory) and the right-hand side in the case where these perturbations are small in the Euclidean and integral topology, respectively. The variation formulas of solutions of a differential equation with discontinuous and continuous initial condition are deduced; as compared with those known earlier, these formulas take into account the variation of the initial instant and the discontinuity and continuity of the initial data. A necessary condition for criticality of mappings defined on a finitely locally convex set is obtained. The quasiconvexity of filters in studying optimal problems with delays in controls is proved. Necessary optimality conditions and existence theorems are proved for optimal problems with variable delays in phase coordinates and controls having a nonfixed initial instant, a discontinuous and a continuous initial condition, and functional and boundary conditions of general form. Necessary optimality conditions are obtained for optimal problems with variable structure and delays. __________ Translated from Sovremennaya Matematika i Ee Prilozheniya (Contemporary Mathematics and Its Applications), Vol. 25, Optimal Control, 2005.     

一类具有非局部边界条件的反应扩散方程奇摄动问题

该文研究了一类具有非局部边界条件的奇摄动反应扩散初始边值问题。在适当的条件下，利用比较定理讨论了问题解的渐近性态。     

General necessary conditions for infinite horizon fractional variational problems

We consider infinite horizon fractional variational problems, where the fractional derivative is defined in the sense of Caputo. Necessary optimality conditions for higher-order variational problems and optimal control problems are obtained. Transversality conditions are obtained in the case state functions are free at the initial time.     

References

  The problems of the nonlocal boundary conditions for the singularly perturbed reaction diffusion systems are considered. Under suitable conditions, using the comparison theorem the asymptotic behavior of solution for the initial boundary value problems are studied.     

Multi-level adaptive solutions to initial-value problems

A multigrid algorithm is developed for solving the one-dimensional initial boundary value problems. The numerical solutions of linear and nonlinear Burgers’ equation for various initial conditions are studied. The stability conditions are derived by Von-Neumann analysis. Numerical results are presented.     

非线性反应扩散方程奇摄动问题

研究了具有非线性反应扩散方程奇摄动问题。在适当的条件下，利用微分不等式理论，讨论了当退化问题具有两个相交解时，原初始边值问题解的渐近性态。      

一类奇摄动反应扩散问题的广义解

本文讨论了一类奇摄动反应扩散方程广义初始边值问题.在适当的条件下,研究了问题广义解的存在、唯一性及其渐近性态.     

A CLASS OF NONLINEAR SINGULARLY PERTURBED PROBLEMS FOR REACTION DIFFUSION EQUATIONS

A class of nonlinear singularly perturbed problems for reaction diffusion equa-tions are considered. Under suitable conditions, by using the theory of differential inequal-ities, the asymptotic behavior of solutions for the initial boundary value problems arestudied, reduced problems of which possess two intersecting solutions.     

关于不可压、无粘流体的Euler方程初值问题的适定性(Ⅱ)

以分层理论为基础,讨论了不可压、无粘流体的Euler方程的形式可解性,并给出了各类不适定初值问题存在形式解的条件与计算方法。并讨论了超曲面上和超平面上初值问题的适定性并给出了存在不唯一解的例证。     

Complete second order differential equations in Banach spaces with dynamic boundary conditions

In this paper, we deal with the mixed initial boundary value problem for complete second order (in time) linear differential equations in Banach spaces, in which time-derivatives occur in the boundary conditions. General wellposedness theorems are obtained (for the first time), which are used to solve the corresponding inhomogeneous problems. Examples of applications to initial boundary value problems for partial differential equations are also presented.     

非线性双曲型微分方程非局部奇摄动问题

本文研究了一类具有非线性双曲型微分方程非局部奇摄动问题．在适当的条件下,讨论了问题解的渐近性态．     

Existence and uniqueness of solutions of initial value problems for nonlinear langevin equation involving two fractional orders

The solvability of initial value problems for nonlinear Langevin equation involving two fractional orders are discussed in this paper. An existence result for the solution is obtained using the Leray–Schauder nonlinear alternative. In addition, sufficient conditions for unique solution are established under the Banach contraction principle. The existence results for the initial value problems of nonlinear classical Langevin equation follow as a special case of our results.     

一类非线性时滞反应扩散系统奇摄动问题

研究了一类具有非线性时滞反应扩散系统奇摄动问题.在适当的条件下,利用比较定理讨论了问题解的渐近性态.