EXPONENTIAL TRICHOTOMY， ORTHOGONALITY CONDITION AND THEIR APPLICATION

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EXPONENTIAL FACTORS AND NONDARBOUXIAN INTEGRABILITY OF THE CHEN SYSTEM

In this paper,we characterize all exponential factors and Darbouxian first integrals of the Chen system. We use the weight homogeneous polynomials and the method of characteristic curves to solve the linear partial differential equations.     

LYAPUNOV-LIKE EXPONENTIAL STABILITY AND UNSTABILITY OF DIFFERENTIAL-ALGEBRAIC EQUATION

1IntroductionInthispaper,considertheexponentialstabilityandunstabilityofdifferenl,ialalgebraicequationformasEd(t) B(x,t)=f(1)whereEisaconstantsingularmatrix(wheflEisnonsingular,(1)isof'dinary'differentialequation),Bisanonlinearfunction,andfisanintegrablef…     

动态指数分布模型及Bayes预测

本文给出了观测值服从指数分布的动态指数分布模型，并在自然参数与状态参数之间满足线性关系ω_t=F'_tθ_t的假设下，利用共轭分布给出了动态指数分布模型多数的修正递推及其预测．     

不动点和中立型随机时滞微分方程的指数p-稳定

本文研究了一个具有变时滞线性中立型随机微分方程的指数p-稳定性.利用小动点定理,在系数函数不要求是取确定值的弱条件下得到了方程指数p-稳定的充分条件,得到了比luo更一般的结论,推广了他的结果.最后,举例说叫本文结果的有效性.     

A GENERALIZATION OF A PROPOSITION ON EXPONENTIAL DICHOTOMY

1 Introduction and Statement of TheoremConsider systemx' = A(t)x f(t, x), (l.1)where x E R", A(t) is a continuous matrix function, f: R x R" - R" is acontinuous function.We say that the linear differential equation X' = A(t)x admits an exponential dichotomy, if it has a fundamental matrix X(t) such thatIX(t)PX--'(s)l 5 K' e--a(t--s) for s S t,(1.2)IX(t)(I -- P)X--'(s)I 5 K' e--a(s--t) for s 2 t, (1'2)where P is a projection (P' = P), K and a are positive constants.Remark Without …     

带跳随机微分方程的Euler-Maruyama方法的几乎处处指数稳定性和矩稳定性

本文首先研究了一维带跳随机微分方程的指数稳定性,并证明Euler-Maruyama(EM)方法保持了解析解的稳定性.其次,研究了多维带跳随机微分方程的稳定性,证明若系数满足全局Lipchitz条件,则EM方法能够很好地保持解析解的几乎处处指数稳定性、均方指数稳定性.最后,给出算例来支持所得结论的正确性.     

一类结合算子分裂和指数型拟合的奇异摄动问题的一致收敛格式

本文将考虑一类最高阶导数项前含有小参数ε的空间方向为二维的对流—扩散方程的一致精度的差分格式,分三部进行讨论。 1 连续问题 我们考虑下面的对流—扩散方程     

多维指数分布

本文讨论了服从多维指数分布的随机向量的各分量间的独立性与相关性，证明了诸分量相互独立的充分必要条件是它们两两无关；并证明了多维指数分布类在弱收敛下的封闭性．     

Exponential trichotomy and p-admissibility for evolution families on the real line

The aim of this paper is to obtain necessary and sufficient conditions for uniform exponential trichotomy of evolution families on the real line. We prove that if p ∈ (1,∞) and the pair (C_b(R,X),C_c(R,X)) is uniformly p-admissible for an evolution family ={U(t,s)}_t≥_s then is uniformly exponentially trichotomic. After that we analyze when the uniform p-admissibility of the pair (C_b(R, X), C_c(R, X)) becomes a necessary condition for uniform exponential trichotomy. As applications of these results we study the uniform exponential dichotomy of evolution families. We obtain that in certain conditions, the admissibility of the pair (C_b(R,X),L^p(R,X)) for an evolution family ={U(t,s)}_t≥_s is equivalent with its uniform exponential dichotomy.     

BIFURCATIONS TO A HETEROCLINIC MANIFOLD WITH NONHYPERBOLIC EQUILIBRIA IN R~n

1IntroductionAsiswellkllowll,11eteroclillicalld11olllo(.lillicorbitsplayallilllportalltroleilltilequalitativetheoryofdyualllicalsystellis.Dyualllicalsystelliswitlla11etcroclinicor11ollloclinicorbitoftenexhibitacolllplicatedglobalbehaviour.UPtoflow.alotofworkhasbeeddolleonbifurcationsofheteroclinicand11omoclillicorbitsconnectillg11yperbolicequilibriumpointsinn-dimensiollaldynalllicaJsystellls.See,l'Orexalllple,[1-3,andreferellcesthereinl.Morerecentlyinterest11asbeedpaidtobifurcationsofhetcroc…     

具双时滞的SEIRS传染病模型指数收敛性

本文研究了一类具指数人口统计与结构的SEIRS传染病模型,利用一种新的基于比较原理的分析,获得了无病平衡点局部和全局指数稳定的两个充分条件.     

EXPONENTIAL STABILITY FOR NONLINEAR HYBRID STOCHASTIC PANTOGRAPH EQUATIONS AND NUMERICAL APPROXIMATION

The paper develops exponential stability of the analytic solution and convergence in probability of the numerical method for highly nonlinear hybrid stochastic pantograph equation. The classical linear growth condition is replaced by polynomial growth conditions, under which there exists a unique global solution and the solution is almost surely exponentially stable. On the basis of a series of lemmas, the paper establishes a new criterion on convergence in probability of the Euler-Maruyama approximate solution. The criterion is very general so that many highly nonlinear stochastic pantograph equations can obey these conditions. A highly nonlinear example is provided to illustrate the main theory.     

EUCLIDEAN GEOMETRY OF CURVED EXPONENTIAL FAMILIES AND ITS APPLICATION TO CONFIDENCE REGIONS

ＥＵＣＬＩＤＥＡＮＧＥＯＭＥＴＲＹＯＦＣＵＲＶＥＤＥＸＰＯＮＥＮＴＩＡＬＦＡＭＩＬＩＥＳＡＮＤＩＴＳＡＰＰＬＩＣＡＴＩＯＮＴＯＣＯＮＦＩＤＥＮＣＥＲＥＧＩＯＮＳＷＥＩＢＯＣＨＥＮＧＡｂｓｔｒａｃｔ：ＥｆｒｏｎａｎｄＡｍａｒｉｐｒｅｓｅｎｔｅｄａＲｉｅ...     

ON EXPONENTIAL STABILITY OF NON-AUTONOMOUS STOCHASTIC SEMILINEAR EVOLUTION EQUATIONS

11MroductlonThe purpose ofthls paper Is to Investigate eWone尬lal stability of*theity mild solutions forcenain Hilbert space－Mued stochastlc evoMlon eqll砒ions,Roughy spe出0ng;we cons讪r山efollowing equation:I 伏I＝*x,＋风Il加L十从L,剧dWn,c〔瓜＋咖。(””””“”(11)D 人n 二x．Where A Is the Infinlteslmalgener砒or ofa certain几semigroup S(t),t＞0;on H and F(t;、)and B(t;·)are In general nonlinear mappings from H to H and H to L(x,H),the family ofall bounded linear operators from …     

EXPONENTIAL STABILITY FOR A CLASS OF SWITCHED STOCHASTIC SYSTEMS

In this paper, the stability properties for a class of switched stochastic systems with commutative componentwise subsystem matrices are studied. Under some switching law, the trivial solutions of the above systems are proved to be exponentially stable in mean square and almost sure exponentially stable if the random perturbations are sufficiently "small".     

GLOBAL EXISTENCE, UNIFORM DECAY AND EXPONENTIAL GROWTH FOR A CLASS OF SEMI-LINEAR WAVE EQUATION WITH STRONG DAMPING

In this paper, we consider the nonlinearly damped semi-linear wave equation associated with initial and Dirichlet boundary conditions. We prove the existence of a local weak solution and introduce a family of potential wells and discuss the invariants and vacuum isolating behavior of solutions. Furthermore, we prove the global existence of solutions in both cases which are polynomial and exponential decay in the energy space respectively, and the asymptotic behavior of solutions for the cases of potential well family with 0相似文献   

指数分布的两个不等式

本文补充了文献［３］、［４］的结果，给出指数分布的两个新的性质．     

Existence of pseudo-almost automorphic solutions for nonlinear differential equations

In this paper, we discuss the existence of pseudo-almost automorphic solutions to linear differential equation which has an exponential trichotomy~ and the results also hold for some nonlinear equations with the form x＇（t） = f（t,x（t）） ＋ λg（t,x（t））, where f,g are pseudo-almost automorphic functions. We prove our main result by the application of Leray-Schauder fixed point theorem.     

连续型BAM神经网络的指数稳定性

首先将连续型双向联想记忆神经网络转化成一个特殊的Hopfield网络模型.在此基础上,对连续BAM神经网络的指数稳定性进行了新的分析,证明了神经网络连接权矩阵在给定的约束条件下有唯一平衡点.所做的分析可以用于设计全局指数稳定的神经网络.