一类 Sine-Gordon 型二阶非线性系统全局吸引子的退化条件及能稳性

本文证明了当｜β｜＜时,有阻尼Sine－Gordon方程的Dirichlet问题的全局吸引子为一个平衡点,而且该平衡点具有指数吸引性,同时将所得结果应用到系统能稳性的研究中．最后给出了若干一般性的结果．     

Hodgkin-Huxley系统的渐进稳定性

用无穷维动力系统的方法研究了Hodgkin-Huxley神经脉冲传导系统的长时间行为.在齐次边界条件与非齐次边界条件证明了系统在其不变流形上的全局吸引子为系统在该不变流形内的唯一平衡点,从而证明了该系统的渐进稳定性.     

Belousov Zhabotinsky化学反应系统的渐近稳定性

用无穷维动力系统的方法研究了Belousov Zhabotinsky化学反应系统的长时间行为.在齐次边界条件与非齐次边界条件下证明了系统在其不变流形上的全局吸引子为系统在该不变流形内的唯一平衡点,从而得到了该系统的渐近稳定性.     

一类具有潜伏周期的空间异质反应扩散梅毒模型动力学分析

该文研究了一类具有潜伏周期的异质空间扩散的梅毒模型的阈值动力学行为.首先讨论了系统解的全局存在性以及系统全局吸引子的存在性.其次,根据传染病模型下一代再生算子定义推导出模型的动力学阈值-基本再生数R₀.具体地,当R₀ <1,无病平衡态是全局吸引的;根据耗散系统的持久性理论证明了当R₀> 1时疾病是一致持久的.最后,在空间同质情形下,推导出模型基本再生数R₀的显示表达式.此外,除了证明无病平衡点的全局稳定之外,还利用波动引理证明了系统正平衡点的全局稳定性.     

耦合Sine-Gordon方程组的渐近行为

本文考虑带Ｄｉｒｉｃｈｌｅｔ边界条件的耦合Ｓｉｎｅ－Ｇｏｒｄｏｎ方程组的渐近行为．证明了整体吸引子的存在性,并给出了整体吸引子的Ｈａｕｓｄｏｏｆ维数的上界估计．本文的估计与文［９］的结果相比有本质上的改进．在参数满足一定条件下,证明了整体吸引子恰好是系统的唯一平衡点     

KGS格点系统的全局吸引子

考虑了对应于Klein-Gordon-Schrdinger方程的格点系统(KGS格点系统)的解的长时间行为．首先通过引入一个加权范数与采用解的“切尾”法,证明了全局吸引子的存在性．在此基础上,采用元素分解法与多面体的球覆盖性质, 得到了此吸引子的Kolmogorov δ-熵的上界的一个估计．最后,我们用有限维的常微分方程的全局吸引子逼近它．     

一类非经典反应扩散方程全局吸引子的正则性

考虑了一类非经典反应扩散方程全局吸引子的正则性。利用渐近先验估计证明了系统在H01(Ω)中的全局吸引子A1在D(A)中有界,并进一步获得A1即为系统在D(A)中的全局吸引子A2。     

具有Holling-III型功能反应的捕食者-食饵扩散模型中避难所的影响

本文在齐次Neumann边界条件下考虑食饵具有避难所的捕食者-食饵扩散模型, 其功能反应函数为Holling-III 型. 主要讨论该系统全局吸引子的存在性和系统永久持续生存性, 以及 避难所对系统非负平衡点稳定性的影响.     

具有Holling-Ⅲ型功能反应的捕食者-食饵扩散模型中避难所的影响

本文在齐次Neumann边界条件下考虑食饵具有避难所的捕食者-食饵扩散模型,其功能反应函数为Holling-III型.主要讨论该系统全局吸引子的存在性和系统永久持续生存性,以及避难所对系统非负平衡点稳定性的影响.     

广义双色散热耦合方程组的初边值问题

研究了一类广义双色散热耦合方程组的初边值问题在齐次边界条件下的吸引子.首先通过Faedo-Galerkin方法证明了整体解的存在唯一性;其次通过证明系统的衰减性和渐近紧性,得到了系统存在全局吸引子;最后证明了该系统的全局吸引子存在有限分形维数.     

Multiple equilibrium points in global attractors for some p-Laplacian equations

In this paper, we continue to study the properties of the global attractor for some p-Laplacian equations with a Lyapunov function F in a Banach space when the origin is no longer a local minimum point but a saddle point of F. By using the abstract result established in our previous work, we prove the existence of multiple equilibrium points in the global attractor for some p-Laplacian equations under some suitable assumptions in the case that the origin is an unstable equilibrium point.     

有阻尼受迫sine-Gordon方程的全局周期吸引子

本文证明了当阻尼与扩散系数在一定的参数范围内时,有阻尼的受迫sineGordon方程的狄氏问题对于任意非自治时间周期受迫力均具有唯一的指数吸引有界集的周期解．并且,如果受迫力是自治的,则全局吸引子恰是系统唯一的指数吸引有界集的平衡解．     

ZERO-DIMENSIONAL GLOBAL ATTRACTOR OF DAMPED SINE-GORDON EQUATION

1.IntroductionandMainResultsInthispaper,weconsiderthedampedsine-Gordonequation,withhomogeneousDirichletboundarycondition:whereu=u(x,t)ER,xEn,fiisaboundeddomaininRe(m=1,2,3)withsmoothboundaryoff,thedampingcoefficientor>0,thediffusingconstantd>0.Inthesequel,insteadofconsideringsystem(1.1),weinvestigatethefollowingsysteminHilbertspaceE=Ha(fi)xL'(fl):inwhichu(t)CHI(fl),v(t)6L'(fl)foranyt>0,A=--dA,G(u)=(--sine f),fEHa(~~),noEV.=Ha(~~),itoEH.=L'(fl).Let11'Onlayrwriteequatioll(l.2)asillwhi…     

Sine—Gordon方程的全局吸引子的维数估计

本文得到了阻尼Ｓｉｎｅ－Ｇｏｒｄｏｎ方程的狄氏问题的全局吸引子的Ｈａｕｓｄｏｒｆｆ维数以偶数上界的参数条件，特别地，当阻尼与Ｌａｐｌａｅ算子的第一个特征值适当大时，全局吸引子是零维的，零维吸引子恰是系统的唯一平衡解并且指数吸引相空间的有界集。     

具有粘弹性和热粘弹性方程组的全局周期吸引子

证明了具有粘弹性和热粘弹性方程组在Dirichlet边界条件下,对于任意的非自治时间周期受迫力,均具有唯一的指数吸引任何有界集的周期解,即全局周期吸引子.并且如果受迫力是自治的,则全局周期吸引子恰是系统唯一的指数吸引有界集的平衡解.     

Random Point Attractors Versus Random Set Attractors

The notion of an attractor for a random dynamical system withrespect to a general collection of deterministic sets is introduced.This comprises, in particular, global point attractors and globalset attractors. After deriving a necessary and sufficient conditionfor existence of the corresponding attractors it is proved thata global set attractor always contains all unstable sets ofall of its subsets. Then it is shown that in general randompoint attractors, in contrast to deterministic point attractors,do not support all invariant measures of the system. However,for white noise systems it holds that the minimal point attractorsupports all invariant Markov measures of the system.     

Almost periodic dynamics of perturbed infinite-dimensional dynamical systems

This paper is concerned with the dynamics of an infinite-dimensional gradient system under small almost periodic perturbations. Under the assumption that the original autonomous system has a global attractor given as the union of unstable manifolds of a finite number of hyperbolic equilibrium solutions, we prove that the perturbed non-autonomous system has exactly the same number of almost periodic solutions. As a consequence, the pullback attractor of the perturbed system is given by the union of unstable manifolds of these finitely many almost periodic solutions. An application of the result to the Chafee–Infante equation is discussed.     

Dynamic interactive stabilization of the switching Kumar-Seidman system

A dynamic control protocol for the Kumar-Seidman flexible production system represented in general algebraic form is suggested. The ultimate purpose of the study is to minimize the total amount of work per unit time. The suggested protocol is proved to generate the required periodic process as a global attractor. In order to substantiate convergence, a number of statements of classical Frobenius-Perron theory are generalized to monotone piecewise affine nonlinear operators. A new method for exciting the required production cycles in the spirit of classical Poincaré’s method is suggested. The approach is based on a new stability criterion for an equilibrium of a discrete stationary system. A dynamic control protocol for the Kumar-Seidman flexible production system represented in general algebraic form is suggested and proved to generate the required periodic process as a global attractor. In order to substantiate convergence, a number of statements of classical Frobenius-Perron theory are generalized to monotone piecewise affine nonlinear operators.     

Attractivity,multistability, and bifurcation in delayed Hopfieldʼs model with non-monotonic feedback

For a system of delayed neural networks of Hopfield type, we deal with the study of global attractivity, multistability, and bifurcations. In general, we do not assume monotonicity conditions in the activation functions. For some architectures of the network and for some families of activation functions, we get optimal results on global attractivity. Our approach relies on a link between a system of functional differential equations and a finite-dimensional discrete dynamical system. For it, we introduce the notion of strong attractor for a discrete dynamical system, which is more restrictive than the usual concept of attractor when the dimension of the system is higher than one. Our principal result shows that a strong attractor of a discrete map gives a globally attractive equilibrium of a corresponding system of delay differential equations. Our abstract setting is not limited to applications in systems of neural networks; we illustrate its use in an equation with distributed delay motivated by biological models. We also obtain some results for neural systems with variable coefficients.