共查询到20条相似文献,搜索用时 109 毫秒
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通过平面动力系统的方法讨论了对称正则长波方程的分岔问题.得到了该方程的分岔条件,在一些参数的具体值的情况下给出相图并通过微分方程的数值模拟方法模拟出了该方程的周期行波解、孤立行波解及无界行波解. 相似文献
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林冬翠 《数学的实践与认识》2018,(12)
在可分实Hilbert空间考虑一类随机积分微分方程在伪概周期环境下解的存在唯一性问题.基于不动点原理和随机分析技巧,给出了方程存在唯一伪概周期解的一组充分条件.研究表明,如果方程预解算子族指数稳定,即使时滞是无界单调不减函数,在适当的条件下,方程依然存在唯一伪概周期解.最后,给出实例加以验证. 相似文献
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(2+1)-维广义Benney-Luke方程的精确行波解 总被引:2,自引:0,他引:2
用平面动力系统方法研究(2+1)-维广义Benney-Luke方程的精确行波解,获得了该方程的扭波解,不可数无穷多光滑周期波解和某些无界行波解的精确的参数表达式,以及上述解存在的参数条件. 相似文献
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该文讨论如下空间非均匀的Boltzmann方程\frac{\partial f}{\partial t} + \xi\cdot \nabla_{x}f(t,x,\xi) = Q(f, f).在角截断的硬位势情况下, 对初值接近行波Maxwell分布时,作者利用一种新的迭代方法, 证明了该方程存在一个非负的永久型解. 因此在空间区域无界的情形下,该文对Villani的猜测给出了否定的回答[12, 13]. 相似文献
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史正平 《数学的实践与认识》2016,(1):284-288
证明带参数λ的Riccati方程x′=x~2+(λ+Q(t))存在周期解的分支点λ_0,当λλ_0时有且仅有两个周期解,当λ=λ_0时有且仅有一个周期解,当λλ_0时所有解无界. 相似文献
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利用动力系统的Hopf分支理论来研究耦合非线性波方程周期行波解的存在性和稳定性.应用行波法把一类耦合非线性波方程转换为三维动力系统来研究,从而给在不同的参数条件下给出了周期解存在和稳定性的充分条件. 相似文献
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Ying Sue Huang 《Journal of Difference Equations and Applications》2020,26(7):871-912
ABSTRACT We study a large class of finite difference equations that exhibit a type of periodic pattern repetition in their solutions for certain choices of initial conditions and prove the existence of unbounded solutions. 相似文献
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In this paper, we use the bifurcation method of dynamical systems to study the periodic wave solutions and their limits for the modified Kd V–KP equations. Some explicit periodic wave solutions are obtained. These solutions contain smooth periodic wave solutions and periodic blow-up solutions. Their limits contain solitary wave solutions, periodic wave solutions, kink wave solutions and unbounded solutions. 相似文献
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Zhiqing Han 《Applied mathematics and computation》2011,217(14):6516-6525
By introducing a variational framework for a class of second order nonlinear differential equations with non-separated periodic boundary value conditions, some results on the existence of non-trivial, positive and negative solutions of the problems are obtained. Some results by Atici-Guseinov, Graef-Kong, etc. obtained by topological degree methods are extended. The resonant case of the problems where the nonlinearities are unbounded and satisfy Ahmad-Lazer-Paul type conditions is also considered. 相似文献
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We establish the existence of bounded, almost periodic and asymptotically almost periodic mild solutions for first- and second-order abstract-retarded functional differential equations with unbounded delay. 相似文献
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In this paper, we use the bifurcation method of dynamical systems to study the traveling wave solutions for the Davey–Stewartson equation. A number of traveling wave solutions are obtained. Those solutions contain explicit periodic wave solutions, periodic blow‐up wave solutions, unbounded wave solutions, kink profile solitary wave solutions, and solitary wave solutions. Relations of the traveling wave solutions are given. Some previous results are extended. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
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In this paper, we study the existence of positive periodic solutions for singular second order equations x" + n2/4x+h(x) = p(t), where h has a singularity at the origin and n is a positive integer. We give an explicit condition to ensure the existence of positive periodic solutions when h is an unbounded perturbation at infinity by using qualitative analysis and topological degree theory. 相似文献
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We find necessary and sufficient conditions to guarantee the existence resp. coexistence of linear independent periodic zero-elements of period mω, m ? ?, of Hill's differential operator D2 + Q, with ω being the minimal period of the function Q. These conditions enable us to construct an unbounded self-adjoint operator which only has periodic eigenfunctions with prescribed period. 相似文献
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Yihong Song 《Journal of Difference Equations and Applications》2013,19(9):971-986
The existence of almost periodic solutions of nonlinear Volterra difference equations with unbounded delay is obtained by using uniform stability properties of a bounded solution. An example is also given to illustrate obtained results. 相似文献
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W. Allegretto 《Journal of Mathematical Analysis and Applications》2011,378(2):528-68
In this paper we present a predator-prey mathematical model for two biological populations which dislike crowding. The model consists of a system of two degenerate parabolic equations with nonlocal terms and drifts. We provide conditions on the system ensuring the periodic coexistence, namely the existence of two non-trivial non-negative periodic solutions representing the densities of the two populations. We assume that the predator species is harvested if its density exceeds a given threshold. A minimization problem for a cost functional associated with this process and with some other significant parameters of the model is also considered. 相似文献
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The authors consider non-autonomous N-body-type problems with strong force type potentials at the origin and sub-quadratic growth at infinity. Using Ljusternik Schnirelmann theory, the authors prove the existence of unbounded sequences of critical values for the Lagrangian action corresponding to non-collision periodic solutions. 相似文献