一类非线性悬臂梁问题的可解性

主要研究了一类四阶非线性常微分方程的非负可解性。非线性项合有所有低阶导数的非线性悬臂梁问题,在非线性项厂满足线性增长的限制条件下,通过构造适当的Banach空间并利用Leray-Schauder非线性诀择证明了一个解的存在性定理。     

具有调和势和耗散非线性项的薛定谔方程局部解

利用调和分析方法讨论具有调和势和耗散非线性项的薛定谔方程柯西问题局部解的存在性,并发现局部解与耗散项系数的大小有关.     

一类具有非线性边界阻尼和源项的非线性波动方程的解的渐近性

研究一类具有非线性边界阻尼和源项的非线性波动方程的初边值问题，证明在一定条件下其整体广义解的存在、解具有衰减性并给出了解的衰减估计。     

一类四阶边值问题的反对称变号解

利用Krasnosel`skii不动点定理及解的延拓技巧,证明了一类非线性四阶边值问题,当其非线性项满足某些假设条件时,存在反对称变号解,并对此进一步推广得到了四阶边值问题具有无穷多个反对称变号解的条件.     

带有非线性阻尼项的非线性电报方程的cauchy问题

考虑带有非线性阻尼项的非线性电报方程的cauchy问题,满足一定条件下,用压缩映射原理得到了上述问题局部广义解的存在唯一性。     

一类非自治二阶Hamilton系统的无穷多周期解

利用临界点理论研究非自治Hamilton系统周期解的存在性.在具有超线性增长非线性项时,根据对称山路定理,得到了系统无穷多个周期解存在的充分条件.     

一类带阻尼项的二阶Hamilton系统的周期解

利用临界点理论研究了测度链上带有阻尼项的二阶Hamilton系统的周期解.当非线性项超线性增长时,根据对称山路定理,得到了系统无穷多个周期解存在的充分条件.     

具源项和退化阻尼项的非线性波动方程解的整体不存在性

研究了非线性波动方程整体解的不存在性,该方程具有源项和退化阻尼项.通过构造不稳定集,利用常微分不等式证明了初始能量为正时整体解的不存在性.     

一类离散p-Laplacian系统周期解的存在性

研究非自治离散p-Laplacian系统的周期解的存在性.当具有p-次线性增长非线性项时,利用临界点理论得到了系统周期解存在性的充分条件,所得结果推广了已有结果.     

一类次线性非自治二阶系统的周期解

在具有次线性非线性项时,利用临界点理论得到了非自治二阶系统周期解的存在性定理.     

非线性一维p-Laplace方程的一个正解存在定理

考察了非线性一维p-Laplace方程在非线性边界条件下的正解存在性．利用锥上的度数理论获得了一个新的存在定理．     

带有变号非线性项多点边值问题的三个正解的存在性(英文)

研究了一类三点边值问题正解的存在性.当非线性项可以变号时,给出了三个正解的存在性定理.     

一类二阶非线性方程的Dirichlet边值问题的可解性

考察了一类二阶非线性常微分方程的Dirichlet边值问题的存在性. 在非线性项线性增长的情况下,利用Leray-Schauder不动点定理获得了若干新的存在性结论.     

Singular perturbation of a second-order three-point boundary value problem for nonlinear systems

This paper deals with the existence of solutions to a singularly perturbed second-order three-point boundary value problem for nonlinear differential systems. The authors construct an appropriate generalized lower- and upper-solution pair, a concept defined in this paper, and employ the Nagumo conditions and algebraic boundary layer functions to ensure the existence of solutions of the problem. The uniformly valid asymptotic estimate of the solutions is given as well. The differential systems have nonlinear dependence on all order derivatives of the unknown.     

一类非线性算子方程解的存在惟一性

利用锥理论与迭代方法,研究了算子方程Lx=Nx解的存在与惟一性,其中L为一线性算子,N为一非线性算子.作为应用,我们讨论了一个弯曲弹性梁方程非负解的存在与惟一性.     

一类具有弱阻尼的非线性Schrdinger方程组解的局部存在性

研究一类带有弱阻尼的非线性Schrdinger方程组的初值问题,通过利用压缩映象原理得到了这类方程组解的局部存在性.     

Existence of solutions and positive solutions to a fourth-order two-point BVP with second derivative

~~4[0,1]Csatisfyingand()hr ?*umu'k(mh r)and*uisanonnegativeconcavefunction.Moreover,ifoneofthefollowingconditionsissatisfied:(1)A B>0;(2)C D<0;(3)f(t,0,0)0,0t1,then*u(t)>0,00suchthatmax{():01,0,80}64,rrr?#ft,u,vtuvthentheproblem(P)hasatleastonesolutionu*C4[0,1]satisfying*urand()*"u8randu*isanonnegativeconcavefunction.Moreover,iff(t,0,0)0,0t1,thenu*(t)>0,0相似文献   

Existence of solutions and positive solutions to a fourth-order two-point BVP with second derivative

Several existence theorems were established for a nonlinear fourth-order two-point boundary value problem with second derivative by using Leray-Schauder fixed point theorem, equivalent norm and technique on system of integral equations. The main conditions of our results are local. In other words, the existence of the solution can be determined by considering the "height" of the nonlinear term on a bounded set. This class of problems usually describes the equilibrium state of an elastic beam which is simply supported at both ends.     

Solvability of the nonlinear Airy equation on a torus

1. Introduction Consider the problem (P) below 2 i(), for (,),txxxuuuuufxxtT++++=未a where the initial condition is 0(0,)()uxux=. Herein 0u and 2()fLT are square integrable complex functions on T; T is the 1-dimensional torus, +Ris the set of positive numbers, and a a real positive number. This type of equation was first introduced in the study of optical fibers [1]. Y. Martel [2] proved the well-posedness for the case of whole space R(the set of all real numbers) with a = …