HOMOCLINIC ORBITS FOR A CLASS OF HAMILTONIAN SYSTEMS WITH POTENTIALS CHANGING SIGN

In this paper, we prove the existence of nontrivial homoclinic orbits for a class of Hamiltonian systems with potential changing sign. We use Mountain Pass Lemma.     

不满足Gordon-强力条件的奇异二阶周期Hamilton系统同宿轨道的存在性

考虑奇异的二阶周期 Hamilton 系统这里q=(q_1,q_2,…,q_n)∈R~n,n>2,V(t,q):R×R~n\{e}→R 是一个奇异的位势函数,e≠0.当V(t,q)具有唯一最大值,但不满足 Gordon- 强力条件时,我们证明了(HS)至少具有一条非平凡的同宿轨道。     

三维系统周期轨道的分支

本文研究三维系统的一类非双曲周期轨道在小扰动下产生周期轨道的问题，并对一类较特殊的系统给出了判别周期轨道存在的具体条件。此外，还给出了具体的应用例子。     

周期系数的平面Hamilton系统的平衡解的稳定性

本文考虑周期系数的平面Hamilton系统H(x,y,t)=H2(x,y,t)+H4(x,y,t)+d(x,y,t)的平衡解的稳定性。其中H2(x,y,t)=1/2[a(t)x2+y2],H4(x,y,t)=b4(t)x4+b2(t)(xy)2+b0(t)y4以及a(t),b0(t),b2(t),b4(t)是连续的T-周期函数,d(x,y,t)关于时间也是T-周期,在原点附近其阶为(x2+y2)3.     

GENERAL DIFFERENCE SCHEMES WITH INTRINSIC PARALLELISM FOR SEMILINEAR PARABOLIC SYSTEMS OFDIVERGENCE TYPE

1.IntroductionIn[1]and[2]thegeneralfinitedifferenceschemeshavingtheintrinsiccharacterofparallelismfortheboundaryvalueproblemsofthenonlinearparabolicsystemofgeneralform(i.e.,non-divergencetype)arediscussedundertheassumptionthatthereisanuniquesmoothsol...     

一类具有对称性的非线性微分方程的正值同宿轨道

利用变分逼近方法,证明了二阶非线性微分方程ue(t)-a(t)u(t) f(t,u(t))=0存在惟一的正值同宿轨道,其中a(t)和f(t,u)都是关于变量t的偶函数。     

EXISTENCE AND UNIQUENESS OF NON－ZERO－HOMOTOPIC PERIODIC ORBITS FOR A CYLINDER SYSTEM

ＥＸＩＳＴＥＮＣＥＡＮＤＵＮＩＱＵＥＮＥＳＳＯＦＮＯＮ－ＺＥＲＯ－ＨＯＭＯＴＯＰＩＣＰＥＲＩＯＤＩＣＯＲＢＩＴＳＦＯＲＡＣＹＬＩＮＤＥＲＳＹＳＴＥＭＨａｎＭａｏａｎＷａｎｇＸｉａｎｇｒｏｎｇＷａｎｇＣｈａｏｙａｎｇ＆ＷａｎｇＺｈｅｎｇ（Ｓｈａｎｄｏｎ...     

一类通有二次哈密顿系统的环性(英文)

1 IntroductionConsider the fOllowing system:t'here E is a small parameter, H(I, y) is a polynomial of degree (n + 1 ) ? f(I, y)and g(x, y) are polynomials of degree S n. The corresponding Abelian integrallswhere b(h) is a compact leve1 curve H--'(h) of (1.l) when E = 0, for h lyingbetween criticaI values of H. The Hilbert-Arnold prob1em (weakend Hilbert16th problern) is to find an upper boulld of the nurnber of zeros of (l.2) forfixed n 2 2 and for al1 H, f and g. In this paper, we tvi11…     

BACKWARD ERROR ANALYSIS OF SYMPLECTIC INTEGRATORS FOR LINEAR SEPARABLE HAMILTONIAN SYSTEMS

Symplecticness, stability, and asymptotic properties of Runge-Kutta, partitioned Runge-Kutta, and Runge-Kutta-Nystrom methods applied to the simple Hamiltonian system p = -vg, q = kp are studied. Some new results in connection with P-stability are presented. The main part is focused on backward error analysis. The numerical solution produced by a symplectic method with an appropriate stepsize is the exact solution of a perturbed Hamiltonian system at discrete points. This system is studied in detail and new results are derived. Numerical examples are presented.     

DELAY DEPENDENT ROBUST DISSIPATIVE CONTROL FOR A CLASS OF NONLINEAR TIME-DELAY SYSTEMS

We discuss the delay dependent robust dissipative problem for a class of time-delay systems with nonlinear perturbations. And the sufficient conditions for the delay dependent robust dissipation and quadratic stability are given by the linear matrix inequalities (LMIs), then the time-delay bound and the delay dependent robust dissipative state feedback controller are presented.     

ON CRITERIA FOR GLOBAL STABILITY OF N-DIMENSIONAL LOTKA-VOLTERRA SYSTEMS

This paper gives the conditions for the existence of a globally stable equi-librium of rz-dimensional Lotka-Volterra systems in the following cases: Lotka-Volterra chain systems and Lotka-Volterra modei between one and multispecies. The conditions obtained in this paper are much weaker than those in [6] and more easily verifiable in application. So the results can be applied to more general Lotka-Volterra models. At the same time, the existence and stability conditions of positive equilibrium points of the above systems are given.     

ON EQUILIBRIA AND PERIODIC ORBITS OF COOPERATIVE SYSTEMS IN R~3

In the paper we present new criteria for existence of equilibria and periodic orbits for 3-dimensional systems which are cooperative. Particular attention is given to the relations of equilibria, cycle K and stable manifold of K. Meanwhile, the results of Hirsch [1, Theorem 9] and Jiang [2] are improved.     

A NOTE ON THE CONSTRUCTION OF SYMPLECTIC SCHEMES FOR SPLITABLE HAMILTONIAN H = H~((1)) H~((2)) H~((3))

For a hamiltonian systemwhere J = [ 2: ], It, is n x n identity matrix, H f R2n - R is a smooth function andl It, O I t It, is n x n identity matrix, H f R2n - R is a smooth function and7 is the gradiellt operator, the 8ymplectic difference schemes should…     

A NOTE ON CONSTRUCTION OF HIGHER-ORDER SYMPLECTIC SCHEMES FROM LOWER-ORDER ONE VIAFORMAL ENERGIES

1.IntroductionFirstofall,let'srecallthedefinitionsofsymplecticschemes,revertibleschemes,andFeng'swayofconstructionofsymplecticmethodsviageneratingfunctions.Aswell-known,thephaseflow{g',tER}ofanyHamiltoniansystem(whereJ~I--i:n1,H:RZn-- RIisasmoothfunc...     

一类Hamilton算子,遗传对称及可积系

本文构造了一类矩阵微分Hamilton算子并且生成了新的遗传对称和相应的可积系,进一步提出了一个新可积族的双Hamilton结构和公共遗传强对称算子。     

二阶渐近周期奇异哈密顿系统同宿轨道

运用集中紧性方法和Ekeland变分原理研究R^2中二阶渐近周期奇异Hamilton系统ue (1 g(t))V‘u(t,u)=0的极小问题,并证明该系统具有两条非平凡同宿轨道。     

一类Hamilton系统的同宿解存在性

We study the existence of homoclinic orbits for some Hamiltonian system.A homoclinic orbit is obtained as a limit of 2kT-periodic solutions of a sequence of systems of differential equations.     

一类带小参数反应——扩散型方程组的性态估计

得到了激光等离子能量交换模型研究中的一类反应－－扩散方程组的本解的存在性。并通过引进光滑符号函数对解析解的性态进行了估计,为数值方法的误差分析提供了理论依据。     

四阶杆振动方程的两类高精度辛格式

In this paper, we present two classes of symplectic schemes with high order accuracy for solving four-order rod vibration equation utt uxxxx=0 via the third type generating function method. First, the equation of four order rod vibration is written into the canonical Hamilton system; second, overcoming successfully the essential difficult on the calculus of high order variations derivative, we get the semi-discretization with arbitrary order of accuracy in time direction for the PDEs by the third type generating function method. Furthermore the discretization of the related modified equation of original equation is obtained. Finally, arbitrary order accuracy symplectic schemes are obtained. Numerical results are also presented to show the effectiveness of the scheme, high order accuracy and properties of excellent long-time numerical behavior.