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 共查询到18条相似文献,搜索用时 109 毫秒
1.
许永红  温朝晖  莫嘉琪 《物理学报》2011,60(5):50205-050205
采用了一个简单而有效的技巧,研究了一类扰动mKdV耦合系统.首先利用同伦映射方法求解一个相应的复值函数微分方程孤子的近似解.然后得到了原扰动mKdV耦合系统孤子的近似解. 关键词: 孤子 扰动mKdV方程 同伦映射  相似文献   

2.
石玉仁  张娟  杨红娟  段文山 《物理学报》2010,59(11):7564-7569
基于双曲函数法的思想,通过选择新的展开函数,得到了modified Korteweg-de Vries(mKdV)方程的几类精确解,其中一类为具有扭结—反扭结状结构的双扭结单孤子解.在不同的极限情况下,该解分别退化为mKdV方程的扭结状或钟状孤波解.文中对双扭结型孤子解的稳定性进行了数值研究,结果表明:在长波和短波简谐波扰动、钟型孤立波扰动与随机扰动下,该孤子均稳定.  相似文献   

3.
石兰芳  莫嘉琪 《物理学报》2009,58(12):8123-8126
采用一个简单而有效的技巧,研究了一类扰动非线性发展方程.首先,引入一个相应典型方程的孤子近似解.然后,利用同伦映射方法得到了原扰动非线性发展方程的近似解. 关键词: 孤子 扰动发展方程 同伦映射  相似文献   

4.
许永红  韩祥临  石兰芳  莫嘉琪 《物理学报》2014,63(9):90204-090204
研究了一类薛定谔非线性耦合系统.利用精确解与近似解相关联的特殊技巧,首先讨论了对应的无扰动耦合系统,利用投射法得到了精确的孤波解.再利用泛函映射方法得到了薛定谔非线性扰动耦合系统的行波近似解.  相似文献   

5.
广义Landau-Ginzburg-Higgs方程孤子解的扰动理论   总被引:1,自引:0,他引:1       下载免费PDF全文
莫嘉琪  王辉  林一骅 《物理学报》2005,54(12):5581-5584
利用扰动方法研究了一类广义Landau-Ginzburg-Higgs方程.引入一个同伦映射,将原方程的解表示为渐近展开式,然后用相应的线性方程的解来近似地表示.讨论了方程的解与得到的近似解的关系. 关键词: 孤子 扰动 同伦映射  相似文献   

6.
林万涛  陈丽华  欧阳成  莫嘉琪 《物理学报》2012,61(8):80204-080204
研究了一类厄尔尼诺/拉尼娜-南方涛动(ENSO)随机扰动模型. 首先, 利用特殊的待定系数方法得到了无扰动ENSO模型下的孤子精确解. 然后利用渐近理论和方法构造了随机扰动ENSO模型的近似解, 并举例说明得到的渐近解具有较好的精度.  相似文献   

7.
扰动KdV方程孤子的同伦映射解   总被引:1,自引:0,他引:1       下载免费PDF全文
莫嘉琪  姚静荪 《物理学报》2008,57(12):7419-7422
利用同伦映射方法研究了一类非线性KdV(Korteweg de Vries)方程. 首先引入一个同伦变换,使相应的方程求孤子解问题转化为映射变换问题.然后利用映射特性得到了原方程孤子的近似解. 关键词: 孤子 扰动 同伦映射  相似文献   

8.
为了研究外加偏压双光子光折变晶体中的矢量空间孤子,建立了矢量空间孤子的动态演化方程,给出了矢量空间孤子数值解.采用数值模拟的方法,求解矢量空间孤子的数值表达式,理论预言了稳态条件下亮-亮、暗-暗自耦合矢量空间孤子的存在;同时,数值求解演化方程,分析了亮-亮自耦合矢量空间孤子的演化特性.数值结果表明,无论两孤子分量的强度近似相等还是有较大差别,这些自耦合矢量空间孤子都可以由数值积分程序给出.亮-亮、暗-暗自耦合矢量空间孤子在双光子光折变晶体中稳定存在.  相似文献   

9.
苏艳丽  姜其畅  吉选芒 《光子学报》2014,39(9):1567-1571
为了研究外加偏压双光子光折变晶体中的矢量空间孤子,建立了矢量空间孤子的动态演化方程,给出了矢量空间孤子数值解.采用数值模拟的方法,求解矢量空间孤子的数值表达式,理论预言了稳态条件下亮-亮、暗-暗自耦合矢量空间孤子的存在|同时,数值求解演化方程,分析了亮-亮自耦合矢量空间孤子的演化特性.数值结果表明,无论两孤子分量的强度近似相等还是有较大差别,这些自耦合矢量空间孤子都可以由数值积分程序给出.亮-亮、暗-暗自耦合矢量空间孤子在双光子光折变晶体中稳定存在.  相似文献   

10.
非线性波方程求解的新方法   总被引:30,自引:0,他引:30       下载免费PDF全文
从Legendre椭圆积分和Jacobi椭圆函数的定义出发,得到了新的变换,并把它用于非线性演化方程的求解.用三个具体的例子,如非线性Klein-Gordon方程、Boussinesq方程和耦合的mKdV方程组,说明了具体的求解步骤.比较方便地得到非线性演化方程或方程组的新解析解,如周期解、孤子解等. 关键词: Jacobi椭圆函数 非线性方程 周期解 孤子解  相似文献   

11.
ABSTRACT

A coupled Alice–Bob modified Korteweg de-Vries (mKdV) system is established from the mKdV equation in this paper, which is nonlocal and suitable to model two-place entangled events. The Lax integrability of the coupled Alice–Bob mKdV system is proved by demonstrating three types of Lax pairs. By means of the truncated Painlevé expansion, auto-Bäcklund transformation of the coupled Alice–Bob mKdV system and Bäcklund transformation between the coupled Alice–Bob mKdV system and the Schwarzian mKdV equation are demonstrated. Nonlocal residual symmetries of the coupled Alice–Bob mKdV system are researched. To obtain localized Lie point symmetries of residual symmetries, the coupled Alice–Bob mKdV system is extended to a system consisting six equations. Calculation on the prolonged system shows that it is invariant under the scaling transformations, space-time translations, phase translations and Galilean translations. One-parameter group transformation and one-parameter subgroup invariant solutions are obtained. The consistent Riccati expansion (CRE) solvability of the coupled Alice–Bob mKdV system is proved and some interaction structures between soliton–cnoidal waves are obtained by CRE. Moreover, Jacobi periodic wave solutions, solitary wave solutions and singular solutions are obtained by elliptic function expansion and exponential function expansion.  相似文献   

12.
赵国忠  蔚喜军  徐云  朱江  吴迪 《中国物理 B》2010,19(8):80204-080204
<正>This paper applies the variational iteration method to obtain approximate analytic solutions of a generalized Hirota-Satsuma coupled Korteweg-de Vries(KdV) equation and a coupled modified Korteweg-de Vries(mKdV) equation. This method provides a sequence of functions which converges to the exact solution of the problem and is based on the use of the Lagrange multiplier for the identification of optimal values of parameters in a functional.Some examples are given to demonstrate the reliability and convenience of the method and comparisons are made with the exact solutions.  相似文献   

13.
莫嘉琪  陈贤峰 《物理学报》2010,59(5):2919-2923
采用了一个简单而有效的技巧,研究了一类非线性扰动Nizhnik-Novikov-Veselov系统.首先引入一个相应典型系统的孤立波解.然后利用同伦映射方法得到了原非线性扰动Nizhnik-Novikov-Veselov系统的近似解析解.  相似文献   

14.
《Physics letters. A》2020,384(19):126471
The coupled Korteweg-de Vries (cKdV) system, originally proposed by Hirota and Satsuma [1], modeling the interaction of two long waves evolving with different dispersion relations, is considered. Multisoliton solutions are explicitly found in the Hirota-Satsuma system by means of an extension of the direct method due to Hirota [2]. Such multisolitons are found to be a complete family of interacting classical solitons consisting of the trivial ones corresponding to the decoupled N-soliton solution of the KdV equation and the ones coupled to the M-cKdV solitons, here simply referred to as the classical (N, M)-soliton solutions which are N+M interacting solitons indeed. Explicit analytical solutions, expressed in terms of hyperbolic functions, are found for the (0, 1), (1, 1) and (0, 2) cases while the process to generate the general (N, M)-soliton solutions is systematically described in detail. In the particular scenario of the (1, 1)-soliton, a novel two-hump one-soliton solution is obtained when a negative prestressing is prescribed for one of the waves in the merging of the 1-KdV and 1-cKdV solitons. Special attention is emphasized to the phase shift for the (1, 1) and (0, 2) interaction cases to asymptotically get a particular remarkable long range interaction phenomenon. Finally, some numerical evolutions are also considered to illustrate the interaction dynamics of the multisolitons and the new two-hump soliton in the different situations considered.  相似文献   

15.
<正>Prom the point of view of approximate symmetry,the modified Korteweg-de Vries-Burgers(mKdV-Burgers) equation with weak dissipation is investigated.The symmetry of a system of the corresponding partial differential equations which approximate the perturbed mKdV-Burgers equation is constructed and the corresponding general approximate symmetry reduction is derived;thereby infinite series solutions and general formulae can be obtained.The obtained result shows that the zero-order similarity solution to the mKdV—Burgers equation satisfies the PainleveⅡequation.Also,at the level of travelling wave reduction,the general solution formulae are given for any travelling wave solution of an unperturbed mKdV equation.As an illustrative example,when the zero-order tanh profile solution is chosen as an initial approximate solution,physically approximate similarity solutions are obtained recursively under the appropriate choice of parameters occurring during computation.  相似文献   

16.
We consider the problem of energy transport in a Davydov model along an anharmonic crystal medium obeying quartic longitudinal interactions corresponding to rigid interacting particles. The Zabusky and Kruskal unidirectional continuum limit of the original discrete equations reduces, in the long wave approximation, to a coupled system between the linear Schrödinger (LS) equation and the modified Korteweg–de Vries (mKdV) equation. Single- and two-hump bright soliton solutions for this LS–mKdV system are predicted to exist by variational means and numerically confirmed. The one-hump bright solitons are found to be the anharmonic supersonic analogue of the Davydov's solitons while the two-hump (in both components) bright solitons are found to be a novel type of soliton consisting of a two-soliton solution of mKdV trapped by the wave function associated to the LS equation. This two-hump soliton solution, as a two component solution, represents a new class of polaron solution to be contrasted with the two-soliton interaction phenomena from soliton theory, as revealed by a variational approach and direct numerical results for the two-soliton solution.  相似文献   

17.
H.C. Hu  B.W. Sang 《Physics letters. A》2010,374(9):1141-1146
New nonsingular positon, negaton and complexiton solutions for the coupled mKdV system are constructed by means of Darboux transformation with constant seed solution and given out both analytically and graphically.  相似文献   

18.
A modified Korteweg-de Vries (mKdV) lattice is found to be also a discrete Korteweg-de Vries (KdV) equation. A discrete coupled system is derived from the single lattice equation and its Lax pair is proposed. The coupled system is shown to be related to the coupled KdV and coupled mKdV systems which are widely used in physics.  相似文献   

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