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1.
高阶拟线性椭圆型方程奇摄动问题   总被引:2,自引:0,他引:2  
本文利用微分不等式和多重尺度,研究了一个高阶椭圆型偏微分方程摄动边值问题,并得到了一致有效的渐近展开式。  相似文献   

2.
讨论了半线性椭圆型方程奇摄动广义边值问题.在适当的条件下研究了对应的边值问题广义解的存在唯一性及其渐近性态.  相似文献   

3.
吴钦宽  莫嘉琪 《数学杂志》1997,17(2):283-288
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。  相似文献   

4.
§ 1  IntroductionA class of singularly perturbed boundary value problems were studied by Mo[1~ 6] .Now we consider the following singularly perturbed nonlinear boundary value problem ofthe formεd2 ydx2 =f(x,y,y′) ,  0 相似文献   

5.
莫嘉琪  张伟江 《数学杂志》1997,17(3):315-320
本文讨论了一类2m阶奇摄动椭圆型方程边值问题的渐近性态,得到了问题解的一致有效的渐近展开式。  相似文献   

6.
莫嘉琪  周康荣 《数学杂志》2002,22(3):287-291
本文是讨论一类在局部区域上的奇摄动非线性Robin边值问题。利用算子理论和不动点原理,得到了相应问题解的存在性和唯一性。  相似文献   

7.
The singularly perturbed boundary value prodlems for the semilinear elliptic equation of higher order are considered . Under suitable conditions and by using the fixed point theorem the existence, uniqueness and asymp- totic behavior of solution for the boundary value problems are studied.  相似文献   

8.
奇摄动四阶椭圆型偏微分方程   总被引:5,自引:0,他引:5  
本文用微分不等式理论讨论了一类奇摄动四阶椭圆型偏微分方程,得到了在整个区域上一致有效的渐近展开式.  相似文献   

9.
石兰芳 《数学杂志》2004,24(1):19-23
本文讨论了一类奇摄动高阶椭圆型方程Dirichlet问题,利用伸长变量和变界层校正法,得到了问题解的形式渐近展开式.再用微分不等式理论,证明了解的一致有效性.  相似文献   

10.
ConsidertheboundaryvalueproblemtothesingularlyperturbednonlinearsystemintheformofwhereEisasmallpositiveparameter,y=(yi,'..)y.),f=(fi,...)fn),A=(Al,'',A.)andB=(BI,sn).MohasdiscussedtheseDroblemsundervarioussituationsusingthemethodofdifferentialinequalities[1--'].Inthispaperweconsiderthecaseoffi.:(0,y,y')=0anduseaclassofnewboundarylayerfunctions.TheoremAssumethat(a)fi(x,y,z)Hfi(x,yi,'',yn,if)''jz.)eC'{xE[~l,1],yie[di,ei],ifER}andtherearepositivenondecreasingcontinuousfunctionsif,i=1,2,'…  相似文献   

11.
§ 1 IntroductionSince 1 970 the perturbed boundary value problems for functional differential equationshave been derived in many fields,such as biology,physics,optimal control and e-conomies[1 ] .Some works on studying it have appeared,for example references[2~ 6] .Inthis paper,we study a kind of singularly perturbed boundary value problems for Volterrafunctional differential equations:εx″(t) =f(t,x(t) ,[Tx] (t) ,x(t-τ) ,x′(t) ,ε) ,t∈ (0 ,1 ) ,(1 )x(t) =φ(t,ε) ,t∈ [-τ,0 ] ,ax(1 )…  相似文献   

12.
In this paper,we study the singular perturbation of boundary value problem for a class of n-th order nonlinear differential equation,the solution is shown to exhibit multiple layer behavior.According to different layers and by introducing extended variable,we obtain the uniformly effective asymptotic expansion with different boundary layer correction term.  相似文献   

13.
四阶半线性椭圆型积分微分方程的奇摄动   总被引:5,自引:1,他引:4  
本文研究了一个四阶椭圆型积分微分方程的奇摄动问题。证明了相应的比较定理并得到了解的一致有效的渐近展开式。  相似文献   

14.
拟线性积分微分方程系统的奇摄动边值问题   总被引:5,自引:0,他引:5  
本文研究高维拟线性积分微分方程系统边值问题的奇摄动,在适当的条件下,利 用渐近分析方法和对角化技巧,证得解的存在性,同时给出解的渐近展开式及其相应的 余项估计.  相似文献   

15.
A class of nonlinear nonlocal singularly perturbed boundary value problems for elliptic equation with boundary perturbation is considered. Under suitable conditions, firstly, the outer solution of the original problem is obtained, secondly, using the stretched variable, the composing expansion method and the expanding theory of power series, the boundary layer is constructed, finally, using the theory of differential inequalities the asymptotic behavior of solution for the boundary value problems is studied and educing some relational inequalities the existence and uniqueness of solution for the original problem and the uniformly valid asymptotic estimation is discussed.  相似文献   

16.
17.
This paper investigates the boundary value problems for a class of singularly perturbed nonlinear elliptic equations. By means of the theory of partial differential inequalities the author obtains the existence and asymptotic estimation of the solutions, involving the boundary and interior layer behavior, of the problems as described.  相似文献   

18.
A class of singularly perturbed nonlocal problems for nonlinear elliptic equation of fourth order are considered. The uniformly valid asymptotic expansion of the solutionis obtained.  相似文献   

19.
In this paper, using the differential inequality and singularly perturbed theory, the singularly perturbed boundary value problems for nonlinear integro-differential system has been studied. Under some appropriate assumptions, the existence of solution has been proved and the uniform validness of the asymptotic expansions for arbitrary nth-order have been obtained simply and conveniently.  相似文献   

20.
The nonlinear singularly perturbed problems for reaction diffusion equations with boundary perturbation are considered. Under suitable conditions, using the theory of differential inequalities the asymptotic behavior of solution for the initial boundary value problems is studied.  相似文献   

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