共查询到20条相似文献,搜索用时 15 毫秒
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Zhu Yanjuan Zhang Chunhua 《Annals of Differential Equations》2005,21(1):106-110
The solitary wave solutions of the combined KdV-mKdV-Burgers equation and the Kolmogorov-Petrovskii-Piskunov equation are obtained by means of the direct algebra method, which can be generalized to deal with high dimensional nonlinear evolution equations. 相似文献
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Employ theory of bifurcations of dynamical systems to a system of coupled nonlin-ear equations, the existence of solitary wave solutions, kink wave solutions, anti-kink wave solutions and periodic wave solutions is obtained. Under different parametric conditions, various suffcient conditions to guarantee the existence of the above so-lutions are given. Some exact explicit parametric representations of travelling wave solutions are derived. 相似文献
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一类非线性波动方程的显式精确解 总被引:14,自引:0,他引:14
本文用直接方法和假设的一种结合求出了一类较广泛的非线性波动方程utt-a1uxx+a2ut+a3u+a4uS^2+a5u^3=0的一些显式精确行波解,贱个有重要的非线性数学物理方程,如φ^4方程,Klein-Gordon方程,Sine-Gordon方程,及Sinh-Gordon方程的近似,Landau-Ginzburg-Higgs方程,Duffing方程,非线性电报方程等都可作为该方程的特殊情形得 相似文献
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We find the exact forms of meromorphic solutions of the nonlinear differential equations ■,n≥ 3,k≥1,where q,Q are nonzero polynomials,Q■ Const.,and p1,p2,α1,α2 are nonzero constants with α1≠α2.Compared with previous results on the equation p(z)f3+q(z)f"=-sinα(z) with polynomial coefficients,our results show that the coefficient of the term f~((k)) perturbed by multiplying an exponential function will affect the structur... 相似文献
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IIntroductlonIntegrMle systems;both classical ajnd quantum me山anies,are aMclnatingsubject·Decades ofresearch In this areahave led to mathematical developme血s that are quite beau-tiful.However,not ail systems posed in physics are Integrable,M Instajnce,the Korteweg-deVies-Burgers(KdV-Burgers),Kur。ot。SI、hinsky(KS)and ifth-order dispersi、Kortevegde Vries(ifth-order KdV)eqUatio。 Therefore the direct methods to sol。nonlinear systemsppear to be more important.In this paper… 相似文献
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一类非线性发展方程的精确孤波解 总被引:4,自引:1,他引:4
张卫国 《高校应用数学学报(A辑)》1996,(4):399-408
本文首先求出了非线性常微分方程u″(ξ)+mu2(ξ)+nu3(ξ)+pu(ξ)=c(Ⅰ)和u″(ξ)+ru′(ξ)+mu2(ξ)+nu3(ξ)+pu(ξ)=c(Ⅱ)的显式精确解.进而求出了组合BBM方程、Burgers方程与组合BBM方程混合型的钟状孤波解和扭状孤波解,同时还求出了广义Boussinesq方程和广义KP方程的钟状和扭状孤波解.文中指出了其行波解可化为(Ⅰ)的发展方程既有钟状又有扭状孤波解,而其行波解可化为(Ⅱ)的发展方程没有钟状孤波解. 相似文献
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本文研究了Fisher方程和Burgers-Fisher方程.运用一种辅助微分方程方法,得到了这两种非线性偏微分方程新的精确行波解. 相似文献
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Abundant new travelling wave solutions to the BBM (Benjamin-Bona-Mahoni) equation are obtained by the generalized Jacobian elliptic function method. This method can be applied to other nonlinear evolution equations. 相似文献
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In this paper,we use an invariant set to construct exact solutions to a nonlinear wave equation with a variable wave speed. Moreover,we obtain conditions under which the equation admits a nonclassical symmetry. Several different nonclassical symmetries for equations with different diffusion terms are presented. 相似文献
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周轩伟 《高等学校计算数学学报》2000,22(2):175-182
1 引 言由于反应扩散方程涉及的大量问题来自物理学、化学、生物学和人口动力学中众多的数学模型,因而有广阔的实际背景.其行波解引起了人们的兴趣,行波解是某个常微分方程的解,对某些传播速度,利用几何方法可以建立其解的存在性(见[1][2][3]).在文[4]中J.Canosa讨论了Fisher方程ut=2u2x+u(1-u)(1)行波解的存在性、逼近解和误差估计.所谓方程(1)的行波解是指形为u(x,t)=u(x-ct)=u(z)的解.众所周知,行波解u(x,t)=u(x-ct)=u(z)是方程(1)的行波解的充要条件是d2udz2+cdudz+u(1-u)=0(2)若u(z)是单调有界且不恒为常数,则u(z)叫做(1)的波前… 相似文献
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本文证明了非线性波动方程的一类小初值问题,当初始能量小于或等于零时,解在有限时间内Blowup.并给出当解有有限扩散速度时解的生命区间的上界估计。 相似文献
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本文将微分方程的Lie变换群方法推广到差分方程,给出了三类非线性差分方程的不变变换,利用这种变换由差分方程的平凡解得到非平凡的单参数解族。 相似文献
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Yuan Mingsheng 《数学物理学报(B辑英文版)》2007,27(2)
This article discusses spherical pulse like solutions of the system of semilinear wave equations with the pulses focusing at a point and emerging outgoing in three space variables. In small initial data case, it shows that the nonlinearities have a strong effect at the focal point. Scattering operator is introduced to describe the caustic crossing. With the aid of the L∞ norms, it analyzes the relative errors in approximate solutions. 相似文献
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Wang Junyu 《数学年刊B辑(英文版)》1994,15(3):283-292
The author demonstrate that the two-point boundary value problem {p′(s)=f′(s)-λp^β(s)for s∈(0,1);β∈(0,1),p(0)=p(1)=0,p(s)>0 if s∈(0,1),has a solution(λ^-,p^-(s)),where |λ^-| is the smallest parameter,under the minimal stringent restrictions on f(s), by applying the shooting and regularization methods. In a classic paper, Kohmogorov et.al.studied in 1937 a problem which can be converted into a special case of the above problem. The author also use the solution(λ^-,p^-(s)) to construct a weak travelling wave front solution u(x,t)=y(ξ),ξ=x-Ct,C=λ^-N/(N+1),of the generalized diffusion equation with reaction δ/δx(k(u)|δu/δx|^n-1 δu/δx)-δu/δt=g(u),where N>0,k(s)>0 a.e.on(0,1),and f(a):=n+1/N∫0ag(t)k^1/N(t)dt is absolutely continuous ou[0,1],while y(ξ) is increasing and absolutely continuous on (-∞,+∞) and (k(y(ξ))|y′(ξ)|^N)′=g(y(ξ))-Cy′(ξ)a.e.on(-∞,+∞),y(-∞)=0,y(+∞)=1. 相似文献
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