一类具有跳跃层的非线性反应扩散系统的渐近行为

讨论了一类具有跳跃层的反应扩散系统.首先,求出了问题的外部解.其次,引入伸长变量,构造了跳跃层校正项.最后,利用微分不等式理论,得到了原问题解的一致有效的渐近展开式.从而研究了相应问题的解的渐近性态.     

Hopf Bifurcations in a Predator-Prey Diffusion System with Beddington-DeAngelis Response

This paper is concerned with a two-species predator-prey reaction-diffusion system with Beddington-DeAngelis functional response and subject to homogeneous Neumann boundary conditions. By linearizing the system at the positive constant steady-state solution and analyzing the associated characteristic equation in detail, the asymptotic stability of the positive constant steady-state solution and the existence of local Hopf bifurcations are investigated. Also, it is shown that the appearance of the diffusion and homogeneous Neumann boundary conditions can lead to the appearance of codimension two Bagdanov-Takens bifurcation. Moreover, by applying the normal form theory and the center manifold reduction for partial differential equations (PDEs), the explicit algorithm determining the direction of Hopf bifurcations and the stability of bifurcating periodic solutions is given. Finally, numerical simulations supporting the theoretical analysis are also included.     

一类带有Beddington-DeAngelis反应和收获时滞的食饵-捕食者系统的分析

主要介绍并研究了一类带有Beddington-DeAngelis反应和收获时滞的食饵-捕食者系统,指出时滞现象能导致稳定的平衡点转变为不稳定的,甚至出现开关现象.     

Complicated Asymptotic Behavior of Solutions for the Cauchy Problem of Doubly Nonlinear Diffusion Equation

In this paper, we analyze the large time behavior of nonnegative solutions to the doubly nonlinear diffusion equation $$u_t−{\rm div}(|∇u^m|^{p−2}∇u^m)=0$$ in $\mathbb{R}^N$ with $p>1,$ $m>0$ and $m(p−1)−1>0.$ By using the finite propagation property and the $L^1-L^∞$ smoothing effect, we find that the complicated asymptotic behavior of the rescaled solutions $t^{\mu/2}u(t^{β_·},t)$ for $0<\mu<2N/(N[m(p−1)−1]+p)$ and $β>(2−\mu[m(p−1)−1])/(2p)$ can take place.     

带Beddington-DeAngelis功能反应项的捕食者-食饵交错扩散模型整体解的存在性

本文采用能量方法和Bootstrap技巧证明了当空间维数n＜10时一类带Beddington-DeAngelis功能反应项的捕食者-食饵交错扩散模型整体解的存在性.     

Asymptotic Behavior for Global Smooth Solution to a One-dimensional Nonlinear Thermoviscoelastic System

This paper is concerned with asymptotic behavior, as time tends to infinity, of globally defined smooth (large) solutions to the system in one-dimensional nonlinear thermoviscoelasticity. Our results show that the global smooth solution approaches to the solution in the H¹ norm to the corresponding stationary problem, as time tends to infinity.     

一类泛函微分方程的全局渐近状态

本文考虑形如x(t)=diag(x(t))g(x_t)的泛函微分方程.我们的主要结果(定理3.1)指明,若g满足一定的条件,则当初始函数属于C([-r,0],R~n)的某个子集时所述方程的所有解都收敛于同一平衡状态.     

非线性奇摄动系统的渐近性态

The asymptotic behavior of solution for a n-dimensional nonlinear singularly perturbed system is studied. Under the appropriate assumptions, the existence of solution for the system is proved and the estimation of the solution is given using the method of differential inequalities.     

具有避难所和Ivlev功能性反应的捕食系统的稳定性分析

本文研究了一类具有Ivlev功能性反应的捕食系统,其中食饵种群具有避难所．本文的目的是对模型进行系统的分析,并讨论由于生物体之间相互作用可能产生的一些有意义的定性结果．     

Global Stability of a Predator-Prey System with Stage Structure for the Predator

In this paper,some feasibly sufficient conditions are obtained for the global asymptotic stability of a positive steady state of a predator-prey system with stage structure for the predator by using the theory of competitive systems,compound matrices and stability of periodic orbits,and then the work of Wang [4] is improved.     

一类具有Beddington-DeAngelis型功能反应函数的HIV病毒动力学系统模型的稳定性

基于Nowak等于1996年提出的一类经典的HIV病毒动力学模型,考虑了一类具有Beddington-DeAngelis功能反映函数的HIV病毒动力学模型,并研究了无病毒平衡点的全局稳定性与感染平衡点的局部稳定性等.     

半导体中一维拟中性飘流扩散模型整体光滑解的渐近性

In this paper, we study the asymptotic behavior of globally smooth solutions of initial boundary value problem for 1-d quasineutral drift-diffusion model for semiconductors. We prove that the smooth solutions(close to equilibrium)of the problem converge to the unique stationary solution.     

具源项的奇异扩散方程解的存在性及渐近性

讨论了一类具源项的奇异扩散方程的第二初边值问题,证明了经典解的存在性以及时间充分大时解的渐近性质.     

四阶非线性系统的全局渐近稳定性

运用构造李雅普诺夫函数的方法 ,研究了一类四阶非线性系统的全局渐近稳定性 ,给出了该系统零解全局渐近稳定的充分条件     

Permanence, extinction and periodic solution of predator-prey system with Beddington-DeAngelis functional response

In this paper we study permanence, extinction and periodic solution of periodic predator-prey system with Beddington-DeAngelis functional response. We provide a sufficient and necessary condition to guarantee the predator and prey species to be permanent. In addition, sufficient condition is derived for the existence of positive periodic solution. This paper improves some main results obtained by Fan and Kuang [M. Fan, Y. Kuang, Dynamics of nonautonomous predator-prey system with the Beddington-DeAngelis functional response, J. Math. Anal. Appl. 295 (2004) 15-39].     

具有Beddington-DeAngelis发生率和两个时滞的HIV感染模型的全局稳定性分析

研究了具有Beddington-DeAngelis发生率和细胞免疫反应的HIV模型的全局性.得到模型的基本再生数R_0和免疫基本再生数R_1.通过建立适当的Lyapunov函数,得出无病平衡点E_0,无免疫平衡点E_1和免疫平衡点E_2是全局渐近稳定的.     

Study on a Cross Diffusion Parabolic System

This paper considers a kind of strongly coupled cross diffusion parabolic system,which can be usedas the multi-dimensional Lyumkis energy transport model in semiconductor science.The global existence andlarge time behavior are obtained for smooth solution to the initial boundary value problem.When the initialdata are a small perturbation of an isothermal stationary solution,the smooth solution of the problem under theinsulating boundary condition,converges to that stationary solution exponentially fast as time goes to infinity.     

一类半线性反应扩散方程组整体解的渐近性态

本文考虑了一类半线性反应扩散方程组初值问题解的整体存在性及渐近性态，并给出了当t→∞时解的衰减速度.     

带Beddington-DeAngelis功能反应项的捕食者-食饵扩散模型的稳定性

本文首先应用上下解方法讨论一类带Beddington-DeAngelis功能反应项的捕食者-食饵扩散模型解的一致有界性和整体存在性,然后通过线性化方法分别给出该模型的半平凡平衡点和正平衡点局部渐近稳定的充分条件,最后应用Lyapunov泛函方法讨论唯一正平衡点的全局渐近稳定性.     

具有Beddington-DeAngelis功能反应、时滞和非线性扩散的捕食系统的稳定性分析

研究了一类具有Beddington-DeAngelis功能反应,时滞和非扩散的三种群食物链的捕食系统.当系统为周期系统时,通过重合度理论的延拓定理和Lyapinov的构造,获得系统周期解的存在性和全局渐进稳定性的充分条件.