二阶振荡微粒群算法

从控制角度分析了微粒群算法的进化方程,在此基础上,为了增加微粒群体的多样性和进一步改善算法性能,引入二阶振荡进化方程来调节微粒群算法的全局和局部搜索能力,避免算法陷入局部最优。实验结果表明,该方法能够显著地加强算法的全局最优性,同时加快算法的收敛速度。     

耦合梁方程解的渐近性

吊桥耦合系统描述了吊桥路面和大链在垂直平面的运动．作者通过验证条件（C）成立首次证明了吊桥耦合系统全局吸引子的存在性．     

Global Stabilization of Nonlinear Systems with Byrnes—Isidori Normal Form

1　IntroductionThe problem of the asymptotic stabilization of minimum phase nonlinear systems viasmooth state feedback has been well studied in[1— 6 ].One major methodology is by useof the nonlinear analog of the nonlinear zero dynamics notion so that,un…     

STUDY ON AN SIS EPIDEMIC MODEL WITH TIME VARIANT DELAY

In this paper, we study an SIS epidemic model with a time variant delay. By means of Liapunov functional, some sufficient conditions of global stability to endemic equilibrium and disease free equilibrium have been obtained. The influence of time delay on the stability of equilibria is displayed.     

UNIFORM PERSISTENCE AND GLOBAL ATTRACTIVITY FOR NONAUTONOMOUS COMPETITIVE SYSTEMS WITH DISPERSION

In this paper, we consider a nonautonomous competitive model with dispersion and a finite number of discrete delays. The system, which consists of two Lotka-Volterra patches, has two competitors: one can disperse between the two patches, but the other is confined to one patch and cannot disperse. Our purpose is to demonstrate that the dispersion rates have no effect on the uniform persistence of the solutions of the system. Furthermore, we establish the conditions under which the system admits a positive periodic solution which attracts all solutions.     

耗散Schrdinger-Poisson方程组解的渐近性

考虑耗散Schr dinger Poisson方程组的Cauchy问题 ,对吸引力情形 ,证明了该问题整体强解的存在唯一性和解的渐近性。     

具有收获率的HollingⅡ类功能性反应系统的定性分析

研究了具有收获率的HollingⅡ类功能性反应系统,讨论了该系统平衡点的存在性和性态,通过构造Lyapunov函数,证明了系统唯一正平衡点是全局稳定的.     

扩散与外界干扰对生物资源的影响

通过对一类具有扩散和外界干扰的生态系统的研究，获得了该系统正平衡态局部稳定和全局稳定的几个条件，这些结果表明了扩散和外界干扰对生物资源有非常重要的影响。     

Optimum Design of Laminates with Aooroximate Fully Isotrooic Behaviors

The paper presents an efficient stiffness optimization approach to fully isotropic laminates with approximate isotropic behaviors respect toboth extensional and bending stiffnesses. Based on the Integral global minimization method, the layer orientation angles andthe layer thickness ratios are chosen as design variablesand the lamination parameters are minimized to get theopthnal designs. Example of laminate with approximatefully isotropic behaviors is presented, which has lessthan one-third the number of plies of a fully isotropiclaminate.     

Global Dynamics of Hopfield Neural Networks with Delay

In this paper,some sufficient estimates of delay are ob-tained by Lyapunov functional method to ensure all thesolutions of Hopfleld neural networks with delay (HNN'D)converge to its equilibrlums as t→∞.