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In this paper,we study the existence.uniqueness and asymptotic stability of the periodic solutions for a class of nonautonomous systems by using the method of Liapunov Function.

利用Liapunov函数方法，研究了一类非自治系统周期解的存在唯一性及渐近稳定性，得到了存在唯一渐近稳定的周期解的充分条件。

In this paper, the boundedness and stability of solutions for a class of fourth order nonlinear differential equations are studied by using the method of Liapunov function.

本文利用Liapunov函数方法，研究了一类四阶非线性微分方程解的稳定性及有界性，得出了解的有界性及稳定性存在的充分条件。

To order to weaken the conservation of the stability conditions obtained by using vector Liapunov function, a new class of comparison systems, a generalized comparison system, is proposed.

这就使得在集结比较系统的过程中，原系统的信息损失较小，从而得到的稳定性判据具有较小的保守性。

When scalar Lyapunov function is Lipschitz continuous and regular, Matrosov theorems with respect to a closed invariant set of a class of nonlinear discontinuous systems are proposed firstly and finally, the problem of finite-time stability with respect to a closed invariant set is considered.

论文最后主要讨论脉冲系统、奇异脉冲系统、线性不确定脉冲系统、不确定脉冲系统指定衰减度以及非线性脉冲系统的奇异H∞控制问题。

Ii A new class of fuzzy two-stage minimum-risk model is proposed. The approximation of credibility function and the convergence of approximation method are discussed.

建立一类新的模糊两阶段最小风险模型，讨论可信性函数的逼近方法及其收敛性。

In chapter 4 , with S-KKM mapping , a new Ky Fan\'s minimax inequality is proved , the locally convex H-space with uniform structure is introduced , s-HKKM mapping is defined as the generalization of KKM mapping, with the H-convexity of Hausdorff locally convex H-space , a new fixed point theorem for the compact andclosed mapping belonging to the class s-HKKM is established ;with local intersection property of muti-function ,K-H-quasi-convexity of mapping , connectedness of set and condensing correspondences, some new vector quasi-variational inequalities are established , respectively .

第四章利用S-KKM映射，建立了新的Ky Fan极小极大不等式；定义了带有一致结构的局部凸H-空间，利用Hausdorff局部凸H-空间的H-凸性，对于属于s-HKKM中紧的闭映射建立了新的不动点定理，利用对应的局部交性质、映射的K-拟-凸性、集合的连通性以及φ-condensing对应分别建立了相应的拟向量变分不等式。

In the programming of the software, modularized and general-purposed program idea, as well as special function employed by independent program,class defined by users-IO_CFG, are adopted. We have not onlyimplemented self-configuration of the system, but also make the OCX of the simulation system in correspondence with the hardware. Thus the configuration and maintenance of the system monitoring software become easy, and the generality, flexibility and expansibility of the system are enhanced

在软件开发过程中，采用了模块化、通用化的设计思想，用独立的程序实现特定的功能，自定义了类——IO_CFG，不仅实现了系统的自动配置，而且将仿真系统中的控件与硬件对应起来，使系统监控软件的组态和维护容易，增强了系统的通用性、灵活性和可扩展性。

Using Pell equations on A,we give a new proof of the well-known fact that ifthe ideal class number of a real quadratic function field K = k equals to 1,thenD must be P or QR, where P,Q,R∈A are monic and irreducible ,and Q,R have odddegrees.

二我们应用A上的Pell方程这一初等方法重新证明一个已知的结果：实二次函数域K = k理想类数为1时， D只能为P或QR，其中P，Q，R∈A首一不可约且Q，R次数为奇数。

From the aspect of word class, that can be as pronoun, adjective, adverb, and conjunction. From the aspect of syntactic function, that can be as subject, object, predicative, and adverbial, it can also introduce nominal clauses, attributive clauses and adverbial clauses. Some idioms are constituted by that and other words.

从词类上讲，that可以是代词、形容词、副词、连词等；从句法上讲，that 可充当主语、宾语、表语、状语等，that还能引导名词性从句、定语从句，与其它词搭配还能引导状语从句，一些习用语可以由that和其它词构成。

An adaptive control scheme,that employs a Gaussian radial basis function networkwith output weights updated on-line according to the Lyapunov stability theory,is sug-gested for regulation of a class of chaotic systems with uncertainties.

四、针对一类带有不确定性的混沌系统，提出基于高斯径向基函数网络的的自适应控制框架，其中网络输出权重根据Lyapunov稳定性理论自适应在线调节。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。