一类带阻尼项的二阶Hamilton系统的多重周期解

利用临界点理论研究带阻尼项的二阶Hamilton系统周期解的存在性.在具有部分周期位势和线性增长非线性项时,根据广义鞍点定理定理,得到了系统多重周期解存在的充分条件.     

一类带阻尼项的p-Laplace系统的多重周期解

利用临界点理论研究带阻尼项的p-Laplace系统周期解的存在性.在具有部分周期位势时,根据广义鞍点定理,得到系统多重周期解存在的充分条件,推广了已有文献的结果.     

关于非自治Lagrange系统的周期解

用变分方法研究非自治Lagrange系统周期解的问题转化为研究Lagrange作用泛函的临界点问题。对Lagrange系统，人们用变分方法已经获得了一系列可解性条件，但是除在超二次条件下，Lagrange作用泛函都是下方有界的。这里的目的是给出Lagrange作用泛函无界的Lagrange系统周期解的其它可解性条件，这时的主要困难是对应的Lagrange作用泛函不再是下方有界的。这里用临界点理论中的鞍点定理得到了Lagrange系统周期解的存在性。     

一类非自治常p-Laplace系统的多重周期解

利用临界点理论研究具有部分周期位势的非自治常p-Laplace系统周期解的存在性．在具有p-线性增长非线性项时,根据广义鞍点定理,得到了系统多重周期解存在的充分条件．     

一类二阶非自治Hamilton系统的周期解

在线性增长和次线性增长条件下,利用临界点理论中的极小作用原理和鞍点定理,研究了二阶非自治Hamilton系统周期解的存在性问题,获得了一些新的可解性条件．     

一类二阶Hamilton系统的周期解

本文研究一类含非定线性项的二阶Ｈａｍｉｌｔｏｎ系统多周期解问题．在位势函数满足超二次齐次条件下，利用临界点理论中对称型越山定理，证明了系统存在无穷多个给定周期的周期解．     

一类时滞微分系统的周期解和全局吸引性

本文考虑如下时滞高维微分周期系统的周期解.利用重合度理论中的延拓定理和Lyapunov泛函方法讨论了上述系统周期解的存在性和全局吸引性,得到了便于应用的新结果.     

一类大系统周期解的存在性

本文把大系统理论中的思想方法运用于高维空间周期解的研究之中,应用泛函分析中的Kakutani集值映射不动点定理讨论了一类大系统周期解的存在性,得到了周期解存在的一般性定理及其推论。考虑大系统     

带周期位势平面薛定谔-泊松方程组的结点解

利用临界点理论中的亏格定理和Nehari流形技巧,本文证明了在二维全空间上一类带周期位势的薛定谔-泊松方程组高能量解的存在性,且该解存在无穷多个结点区域.更进一步,得到了其基态解的存在性且是不变号的.     

变分方法求解脉冲微分方程

本文研究一类具有周期边值条件的脉冲微分方程解的存在性问题.通过运用临界点理论以及变分方法证明此系统存在周期解.     

一类四阶差分系统的多重周期解（英文）

By using critical point theory,we study periodic solutions for a class of fourthorder difference systems with partially periodic potential and linear nonlinearity.Some sufficient conditions for the existence of multiplicity of periodic solutions are obtained via generalized saddle point theorem.     

Periodic solutions for some nonautonomous second order Hamiltonian systems

The existence and multiplicity of periodic solutions are obtained for nonautonomous second order Hamiltonian systems by the minimax methods in critical point theory.     

Perturbed S1-symmetric hamiltonian systems

By techniques of critical point theory, we show that multiple periodic weak solutions of a general class of Hamiltonian systems persist despite perturbation with an L² term destroying the S¹-symmetries.     

Some existence results on periodic solutions of ordinary p-Laplacian systems

Some existence theorems are obtained for periodic solutions of ordinary p-Laplacian systems by the minimax methods in critical point theory.     

Periodic and subharmonic solutions of second-order Hamiltonian systems

Some solvability conditions of periodic solutions and subharmonic solutions are obtained for a class of new superquadratic non-autonomous second-order Hamiltonian systems by the minimax methods in critical point theory.     

Notes on periodic solutions of subquadratic second order systems

Some existence theorems are obtained for periodic solutions of the subquadratic second order systems by the minimax methods in critical point theory.     

Optimal combining quota-share and excess of loss reinsurance to maximize the expected utility

The existence of periodic solutions are obtained for non-autonomous ordinary p-Laplacian systems by the least action principle in critical point theory.     

Periodic and subharmonic solutions of a class of subquadratic second-order Hamiltonian systems

Some solvability conditions of periodic and subharmonic solutions are obtained for a class of subquadratic nonautonomous second-order Hamiltonian systems by the minimax methods in critical point theory.     

Periodic solutions for a class of nonautonomous subquadratic second order Hamiltonian systems

Some existence theorems are obtained for periodic solutions of a class of unbounded nonautonomous nonconvex subquadratic second order Hamiltonian systems by using the minimax methods in critical point theory.