共查询到20条相似文献,搜索用时 359 毫秒
1.
2.
利用推广的齐次平衡方法,首先将(2+1)维Broer-Kaup方程线性化,然后构造出丰富的广义孤子解,包括单孤子解,单曲线孤子解,单dromion解,多dromion解。此方法直接而简单,可推广应用一大类(2+1)维非线性可积方程。 相似文献
3.
变系数(2+1)维Broer-Kaup方程的新精确解 总被引:1,自引:1,他引:0
李德生 《原子与分子物理学报》2004,21(1)
通过一个简单的变换,变系数(2+1)维Broer-Kaup方程被简化为人们熟知的变系数Burgers方程.利用近年来广泛使用的齐次平衡法和tanh-函数法,获得了变系数(2+1)维Broer-Kaup方程的一些新的精确解. 相似文献
4.
变系数(2+1)维Broer-Kaup方程的新精确解P 总被引:2,自引:1,他引:1
李德生 《原子与分子物理学报》2004,21(1):133-138
通过一个简单的变换,变系数(2+1)维Broer-Kaup方程被简化为人们熟知的变系数Burgers方程.利用近年来广泛使用的齐次平衡法和tanh-函数法,获得了变系数(2+1)维Broer-Kaup方程的一些新的精确解. 相似文献
5.
6.
7.
李德生 《原子与分子物理学报》2004,21(1):133-138
通过一个简单的变换,变系数(2 1)维Broer-Kaup方程被简化为人们熟知的变系数Burgers方程。利用近年来广泛使用的齐次平衡法和tanh-函数法,获得了变系数(2 1)维Broer-Kaup方程的一些新的精确解。 相似文献
8.
变系数(2+1)维Broer-Kaup方程的精确解 总被引:19,自引:4,他引:15
利用齐次平衡原则,导出了变系数(2+1)维Broer-Kaup方程的B?cklund变换(BT),并由该BT,求出了(2+1)维Broer-Kaup方程的各种形式的精确解. 相似文献
9.
10.
11.
Two simple methods, based on simple crystal models, for estimating the longitudinal optical surface vibration mode frequencies which lie in a LALO gap are examined. One method consists of deriving and solving a single-variable equation for the surface mode frequency, which depends only on the experimental bulk dispersion curves. The other method consists of fitting the known dispersion curves of a simple one-dimensional model, for which the optical surface mode frequency is given by a simple expression, to experimental bulk dispersion curves of more complex crystals. The results are compared with detailed theoretical surface mode calculations. The latter method is found to give better estimates. 相似文献
12.
13.
G. P. Kamuntavičius 《Few-Body Systems》1986,1(2):91-109
We present a new method of a direct derivation of differential equations for the wave-function components of identical-pariticles systems. The method generates in a simple manner all the possible variants of these equations. In some cases they are the differential equations of Faddeev of Yakubovskii. It is shown that the case of the bound states allows to formulate very simple equations for the components which are equivalent to the Schrödinger equation for the complete wave function. The components with a minimal antisymmetry are defined and the corresponding equations are derived. 相似文献
14.
Previous studies of simple polymers have produced energy bands and densities of states which are not in good agreement with each other. We present here an accurate non-parametric method for determining the electronic energy levels of simple polymers, and apply this method to several simple polymers, both with and without impurity side groups. 相似文献
15.
This Letter investigates chaos synchronization of chaotic and hyperchaotic systems. Based on finite-time stability theory, a simple adaptive control method for realizing chaos synchronization in a finite time is proposed. In comparison with previous methods, the present method is not only simple, but could also be easily utilized in application. Numerical simulations are given to illustrate the effectiveness and validity of the proposed approach. 相似文献
16.
D.J. Ewins 《Journal of sound and vibration》1975,43(4):595-605
A simple method is proposed for estimating the resonant peak response levels of damped structures, by using an analysis of undamped vibration. The method is based on a simple identity which is exact for a single degree of freedom system and approximate for more general systems. However, since the level of damping in practical structures can seldom be described with any precision, it is argued that a simple approximate method for predicting resonant vibration levels is the most appropriate. A number of examples and applications are described. 相似文献
17.
Let F be a probability distribution with support on the non-negative integers. Four methods for generating a simple undirected graph with (approximate) degree distribution F are described and compared. Two methods are based on the so called configuration model with modifications ensuring a simple graph, one method is an extension of the classical Erdös-Rényi graph where the edge probabilities are random variables, and the last method starts with a directed random graph which is then modified to a simple undirected graph. All methods are shown to give the correct distribution in the limit of large graph size, but under different assumptions on the degree distribution F and also using different order of operations. 相似文献
18.
19.
The general theory for cycling transformations in the group theoretic approach to strings is presented. It leads to a simple physical interpretation of the method which is discussed. We also demonstrate that twisting and sewing, i.e. factorization are an inevitable consequence of the method. We show that there exists a particularly simple choice of cycling transformations that leads to very great simplifications in the results for excited string scattering. 相似文献