一类具有一般发生率的阶段结构传染病模型的稳定性

建立了一类具有一般发生率的阶段结构传染病模型,利用Hurwitz判据和极限系统理论知识等,分别讨论了染病者无输入和染病者有输入时,疾病消除平衡点和地方病平衡点的局部和全局稳定性,得到了一些重要结论,并对所得结果进行了数值模拟.     

胸腺细胞发育非线性模型的稳定性分析

T细胞同祖细胞在骨髓中的发育一样在胸腺中分裂、分化、并最终发育成为成熟的T细胞.研究人员通过建立一类描述T细胞增殖、分化、死亡的微分方程模型来估计胸腺细胞总量及各种未成熟或成熟细胞所占的比例.本文在利用准静态近似法的基础之上,采用微分方程稳定性理论中的有关方法对这类微分方程模型的稳定性等问题进行了完整的理论分析,所获得的其平衡位置为全局渐近稳定的结论为有关文献中采用数值模拟所预测的结论的正确性提供了理论依据.     

基于两斑块和迁移的SIRS传染病模型的稳定性分析

根据传染病动力学原理,考虑人口在两斑块上流动且具有非线性传染率,建立一类基于两斑块和迁移的SIRS传染病模型.利用常微分方程定性与稳定性方法,分析非负平衡点的存在性,通过构造适当的Lyapunov函数,获得无病平衡点和地方病平衡点全局渐近稳定的充分条件.研究结果表明:基本再生数是决定疾病流行与否的阀值,当基本再生数小于等于1时,疾病逐渐消失;当基本再生数大于1且疾病主导再生数大于1时,疾病持续流行并将成为一种地方病.     

一类具密度制约SIS模型的全局稳定性和周期性

研究了一类具密度制约和双线性传染率的S IS传染病模型,考虑到了实际中对易感者和传染者的控制,得到了地方病平衡点的全局渐近稳定性和系统的周期性,并给出了生物学解释和仿真.     

按比例接种情况下的乙肝流行模型及研究

研究了按比例接种情况下的乙肝这种流行病的数学模型，给出了对疾病传播有重要影响的再生数R0，得到了无病平衡点和地方病平衡点的局部渐近稳定性，并对不同的参数进行了数值模拟．     

潜伏期具传染力SEIS模型正平衡点的全局稳定性

研究了一类潜伏期、染病期均具传染力且有不同饱和接触率C_1(N)和C_2(N)的SEIS传染病模型,得到了判断疾病流行与否的基本再生数R_0.利用周期轨道轨道稳定性和Poincare-Bendixson性质理论,证明了当R_0>1时,正平衡点P~*在T内全局渐近稳定,疾病流行形成地方病.     

一类带扩散项的HIV模型的平衡解的稳定性分析

研究了一类齐次Neumann边界条件下带扩散项的HIV模型.运用赫尔维茨判定定理得出正常数平衡解在一定条件下的局部渐近稳定性;当游离病毒达到一定量时,通过构造Lyapunov函数得出正常数平衡解全局稳定的条件.     

带有积分条件的泛函微分方程的稳定性分析

本文讨论了下列泛函微分方程: 这里T>0,T_1≥0。令Q=bf(a)/c。若Q≤1,则上述方程有唯一平衡点且全局稳定。若Q>1,则上述方程的正平衡点渐近稳定,另一平衡点不稳定。所采用的证明方法是构成Lyapunov泛函和利用广义持征方程,与[2]、[3]不同.当f(y)=y即可得K.L.cooke[3]的结论.当T=T_1=O,f(y)=y即可得[2]的讨论。     

一类具有垂直传染率的SIS模型的稳定性分析

研究了一类具有垂直传染率的SIS模型,首先计算出该模型的基本再生数和平衡点,其次分析了该模型在无病平衡点处的局部渐近稳定性和全局稳定性;然后构造Lyapunov函数证明了地方病平衡点的全局稳定性;最后得到当基本再生数小于1时,传染病会逐渐消失;基本再生数大于1时,传染病将会流行并最终形成一种地方病.     

具有时滞的媒介传播模型的稳定性分析

研究具有时滞的媒介传播的传染病模型.确定了疾病是否流行的阈值R0.当R0≤1时,通过构造Lyapunov泛函证明了系统无病平衡点的全局渐近稳定性.     

具有桥梁人群的HIV模型的持续生存

给出了一致持续性的一些概念及基本理论,建立了具有桥梁人群的H IV模型.利用所给结论研究了具有桥梁人群的H IV模型的一致持续性,从而说明艾滋病会流行起来.     

An SIS epidemic model with diffusion

The aim of this paper is to study the dynamics of an SIS epidemic model with diffusion. We first study the well-posedness of the model. And then, by using linearization method and constructing suitable Lyapunov function, we establish the local and global stability of the disease-free equilibrium and the endemic equilibrium, respectively. Furthermore, in view of Schauder fixed point theorem, we show that the model admits traveling wave solutions connecting the disease-free equilibrium and the endemic equilibrium when R_0 1 and c c~*. And also, by virtue of the two-sided Laplace transform, we prove that the model has no traveling wave solution connecting the two equilibria when R_0 1 and c ∈ [0, c~*).     

Global analysis of virus dynamics model with logistic mitosis,cure rate and delay in virus production

In this paper, we study a virus dynamics model with logistic mitosis, cure rate, and intracellular delay. By means of construction of a suitable Lyapunov functionals, obtained by linear combinations of Volterra—type functions, composite quadratic functions and Volterra—type functionals, we provide the global stability for this model. If R₀, the basic reproductive number, satisfies R₀ ≤ 1, then the infection‐free equilibrium state is globally asymptotically stable. Our system is persistent if R₀ > 1. On the other hand, if R₀ > 1, then infection‐free equilibrium becomes unstable and a unique infected equilibrium exists. The local stability analysis is carried out for the infected equilibrium, and it is shown that, if the parameters satisfy a condition, the infected equilibrium can be unstable and a Hopf bifurcation can occur. We also have that if R₀ > 1, then the infected equilibrium state is globally asymptotically stable if a sufficient condition is satisfied. We illustrate our findings with some numerical simulations. Copyright © 2014 John Wiley & Sons, Ltd.     

Global stability of a multistrain SIS model with superinfection and patch structure

We study the global stability of a multistrain SIS model with superinfection and patch structure. We establish an iterative procedure to obtain a sequence of threshold parameters. By a repeated application of a result by Takeuchi et al. [Nonlinear Anal Real World Appl. 2006;7:235–247], we show that these parameters completely determine the global dynamics of the system: for any number of patches and strains with different infectivities, any subset of the strains can stably coexist depending on the particular choice of the parameters.     

OPTIMAL HARVESTING POLICY FOR INSHORE-OFFSHORE FISHERY MODEL WITH IMPULSIVE DIFFUSION

This article studies the inshore-offshore fishery model with impulsive diffusion. The existence and global asymptotic stability of both the trivial periodic solution and the positive periodic solution are obtained. The complexity of this system is also analyzed. Moreover, the optimal harvesting policy are given for the inshore subpopulation, which includes the maximum sustainable yield and the corresponding harvesting effort.     

关于扰动微分方程零解稳定性若干定理的改进

本文运用Ляиунов第二方法研究扰动微分方程零解稳定性，分别研讨了所给扰动微分方程的局部稳定性、全局渐近稳定性以及全局一致渐近稳定性问题，得到若干定理，这些结果在一定条件下改进了文[1]的相应结果，运用更加广泛．     

Analysis of dynamics in a general intraguild predation model with intraspecific competition

This paper is devoted to studying the dynamical properties of a general intraguild predation model with intraspecific competition. We first investigate the stability of all possible equilibria in relation to the ecological parameters, and then study the long time behavior of the solution. Moreover, we provide a detailed analysis of dynamics of a IGP model with linear functional response and intraspecific competition. Our results show that the impact of the intraspecific competition essentially increases the dynamical complexity of the system.     

具有桥梁人群的HIV模型的研究

研究了具有桥梁人群(从事性服务的女性静脉吸毒者)的艾滋病模型.在桥梁人群内部建立一个DI模型.通过定性分析,证明了各类平衡点的稳定性,从而判断艾滋病流行与否.     

On global stability of a nonresident computer virus model

In this paper, we establish new sufficient conditions for the infected equilibrium of a nonresident computer virus model to be globally asymptotically stable. Our results extend two kind of known results in recent literature.     

二阶非线性微分方程零解的全局渐近稳定性

本文研究了具有四个非线性项零解的全局渐近稳定性。