具性别和阶段结构的非自治二种群捕食者-食饵系统研究

讨论了一类食饵具有性别结构,捕食者具有阶段结构的非自治捕食者．食饵系统,运用Liapunov函数方法,得到了该系统一致持续生存的充分条件．对于该模型的周期系统,在适当条件下,存在唯一、全局渐近稳定的周期解．对更具普遍意义的概周期现象,也得出了概周期正解唯一存在且全局渐近稳定的充分条件．     

具有庇护所的三种群捕食者-食饵模型

讨论了一类具有庇护所的自治三种群捕食者一食饵模型,运用Liapunov函数方法,得到了该模型持久性的充分条件．对于该模型的周期系统,在一定的条件下,将产生唯一一个全局渐近稳定的周期正解．对更具普遍意义的概周期现象,也得出了概周期正解唯一存在且全局渐近稳定性的充分条件．     

Almost periodic solution of non-autonomous Lotka-Volterra predator-prey dispersal system with delays

This paper studies a non-autonomous Lotka-Volterra almost periodic predator-prey dispersal system with discrete and continuous time delays which consists of n-patches, the prey species can disperse among n-patches, but the predator species is confined to one patch and cannot disperse. By using comparison theorem and delay differential equation basic theory, we prove the system is uniformly persistent under some appropriate conditions. Further, by constructing suitable Lyapunov functional, we show that the system is globally asymptotically stable under some appropriate conditions. By using almost periodic functional hull theory, we show that the almost periodic system has a unique globally asymptotical stable strictly positive almost periodic solution. The conditions for the permanence, global stability of system and the existence, uniqueness of positive almost periodic solution depend on delays, so, time delays are "profitless". Finally, conclusions and two particular cases are given. These results are basically an extension of the known results for non-autonomous Lotka-Volterra systems.     

具时滞的非自治扩散捕食系统的概周期解

在本文中,我们考虑具时滞的扩散概周期捕食系统,其中被捕食者可在两个缀块间迁移,而捕食者被限制在其中一个缀块内,并证明了该系统存在唯一的全局吸引的正概周期解．     

具有反馈控制的两种群竞争系统的概周期解

讨论了具有反馈控制的两种群概周期竞争系统,利用微分不等式和构造适当的Lyapunov函数,获得存在全局渐近稳定的概周期解的充分条件.     

Willis环状脑动脉瘤模型的概周期解

运用构造Liapunov函数的方法，证明了一类非线性系统+(μ+f(x))x+αx-βx2+γx3+g(x)=Fcosωt+e(t)(其中α，β，γ，μ均为正数)，在一定条件下存在唯一的一致渐近稳定的概周期解     

具有反馈控制和功能性反应的两种群竞争系统的概周期解

研究了具有反馈控制和功能性反应的两种群竞争系统．通过构造适当的Lyapunov函数,得到了系统存在全局渐进稳定的概周期解的充分性条件。     

多种群阶段结构竞争系统的周期解与概周期解

研究具有阶段结构的多种群竞争系统,得到该系统一致持久,正周期解全局渐近稳定及概周期解的存在性与一致渐近稳定性的充分条件。     

具有无穷时滞的生态竞争系统概周期解存在性

利用不动点原理,给出了具有无穷时滞的生态竞争系统存在概周期解的简洁而实用的充分条件．     

Convergence in almost periodic Fisher and Kolmogorov models

 We study convergence of positive solutions for almost periodic reaction diffusion equations of Fisher or Kolmogorov type. It is proved that under suitable conditions every positive solution is asymptotically almost periodic. Moreover, all positive almost periodic solutions are harmonic and uniformly stable, and if one of them is spatially homogeneous, then so are others. The existence of an almost periodic global attractor is also discussed. Received: 11 November 1996 / Revised version: 8 January 1998