变更Boussinesq方程和Kupershmidt方程的多孤子解

使用王明亮引进的齐次平衡方法,求出了变更Boussinesq方程和Kupershmidt方程的多孤子解,而王明亮给出的变更的Boussinesq方程的单孤子解仅是上述结果的一种特殊情况.     

三维广义MHD方程和Boussinesq方程正则性准则的注记

该文研究三维具有分数阶耗散项的广义MHD方程,得到了在负指标齐次Besov空间意义下速度场u与磁场b和的正则性准则,推广了已有结论.另外,该文还得到了三维分数阶耗散广义Boussinesq方程光滑解关于速度梯度的一个正则性准则.     

受迫耗散Boussinesq方程的可积性质和孤波解的探讨

考虑到耗散效应和地形外力,Rossby波的振幅可由受迫耗散Boussinesq方程来描述.当包含这两项时,模型比较复杂,不具有Painleve性质.通过将模型双线性化,双线性方法是一个可寻找孤波解和B(a|¨)cklund变换的方法.通过截断的Painleve展开式,得到了将方程双线性化的合适的因变量变换.然后得到了受迫耗散Boussinesq方程的单孤波解和B(a|¨)cklund变换.     

强非线性广义Boussinesq方程的数值解

正0引言Boussinesq方程是一种用于描述水波运动传播的方程.它是在一定水面和海底边界条件下,对Laplace方程或Euler方程进行垂向积分后简化得到的,可以被用于模拟表面重力波传播过程中由于复杂地形、障碍物和水流等因素影响发生的浅化,绕射折射,底摩擦能量耗散及破碎等复杂现象~[1-4].适用于变化水深的Boussinesq方程最先由Peregrine~[5]给出,被称为经典B方程,目前已经有一些文献对其进行了理论研究~[6-11].2008年张卫国和陶涛在文献[12]中建立了强非线性广义Boussinesq方程的耗散项,波速,渐进值与波形函数的导数之间的关系并且利用适当变换和待定假设方法求出了广义Boussinesq方程的扭状或钟状孤波解,给出了波速对波形影响的结论.此外,Yang Z J,Cheng G W在文     

推广的β平面近似下带有外源和耗散强迫的非线性Boussinesq方程及其孤立波解

在推广的β平面近似下,从包含耗散和外源的准地转位涡方程出发,利用Gardner-Morikawa变换和弱非线性摄动展开法,推导出带有外源和耗散强迫的非线性Boussinesq方程去刻画非线性Rossby波振幅的演变和发展.利用修正的Jacobi椭圆函数展开法,得到Boussinesq方程的周期波解和孤立波解,从解的结构分析了推广的β效应、切变基本流、外源和耗散是影响非线性Rossby波的重要因素.     

强非线性广义 Boussinesq 方程孤波解的波形分析及求解

上海理工大学理学院\quad 上海 200093该文建立了强非线性广义 Boussinesq 方程的耗散项、波速、渐进值与波形函数的导数之间的关系.利用适当变换和待定假设方法,作者求出了上述广义 Boussinesq 方程的扭状或钟状孤波解,还求出了以前文献中未曾提到过的余弦函数的周期波解.进一步给出了波速对波形影响的结论,即:``好'广义 Boussinesq 方程的行波当波速由小变大时,波形由钟状孤波变成余弦函数周期波解;``坏'广义 Boussinesq 方程的行波当波速由小变大时,波形由余弦函数周期波解变成钟状孤波.     

二维各向异性Boussinesq方程的稳定性

Boussinesq方程是一类在天气预报、海洋生态等领域有广泛应用的地球物理模型,其稳定性研究是流体力学的重要课题之一.本文研究速度场只有水平耗散,温度方程带阻尼项的二维Boussinesq方程在区域T×R上解的稳定性和长时间行为.通过将速度u和温度θ正交分解成水平部分(u,θ)和振荡部分(u,θ),构造恰当的能量泛函并利用各向异性Sobolev不等式及靴带原理证得解的稳定性和衰减率.     

层结流体中带有耗散和地形强迫的非线性Boussinesq方程及其解

本文研究在层结流体中非线性Rossby波的动力学模型.利用GardnerMorikawa变换和摄动展开法,从包含耗散、地形和外热源的准地转斜压位涡方程出发,推导了强迫非线性Boussinesq方程去描述非线性Rossby波振幅的演变和发展.利用修正的Jacobi椭圆函数展开法和同伦摄动法,得到强迫非线性Boussinesq方程的解析解和近似解.解的结果表明推广的β效应、基本流剪切效应和层结效应是产生非线性Rossby孤立波的重要因素,耗散和地形是影响非线性Rossby孤立波演变的外强迫因素.     

带可加噪声的非自治随机Boussinesq格点方程的随机吸引子

该文研究具时变耦合系数的非自治随机Boussinesq格点系统同时受依时间确定性外力和可加白噪声影响时的渐近行为.首先证明非自治随机Boussinesq格点方程的解生成的连续余圈的随机吸引子的存在性.然后证明此系统的随机吸引子在噪声项系数趋于零时的上半连续性.     

耗散Schr dinger-Boussinesq方程的指数吸引子(英文)

研究了耗散 Schr dinger- Boussinesq方程所生成的半群的性质 ,通过算子分解和构造渐近紧不变集 ,得到了该系统的指数吸引子     

On a class of self-similar processes with stationary increments in higher order Wiener chaoses

We study a class of self-similar processes with stationary increments belonging to higher order Wiener chaoses which are similar to Hermite processes. We obtain an almost sure wavelet-like expansion of these processes. This allows us to compute the pointwise and local Hölder regularity of sample paths and to analyse their behaviour at infinity. We also provide some results on the Hausdorff dimension of the range and graphs of multidimensional anisotropic self-similar processes with stationary increments defined by multiple Wiener–Itô integrals.     

A REPRESENTATION FORMULA RELATED TO SCHR(O)DINGER OPERATORS

Schr(o)dinger operator is a central subject in the mathematical study of quantum mechanics.Consider the Schrodinger operator H = -△ V on R, where △ = d2/dx2 and the potential function V is real valued. In Fourier analysis, it is well-known that a square integrable function admits an expansion with exponentials as eigenfunctions of -△. A natural conjecture is that an L2 function admits a similar expansion in terms of "eigenfunctions" of H, a perturbation of the Laplacian (see [7], Ch. Ⅺ and the notes), under certain condition on V.     

On a class of Riemann surfaces

It is considered the class of Riemann surfaces with dimT1 = 0, where T1 is a subclass of exact harmonic forms which is one of the factors in the orthogonal decomposition of the spaceΩH of harmonic forms of the surface, namely The surfaces in the class OHD and the class of planar surfaces satisfy dimT1 = 0. A.Pfluger posed the question whether there might exist other surfaces outside those two classes. Here it is shown that in the case of finite genus g, we should look for a surface S with dimT1 = 0 among the surfaces of the form Sg\K , where Sg is a closed surface of genus g and K a compact set of positive harmonic measure with perfect components and very irregular boundary.     

CONTENTS OF VOLUME 30

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Instructions for contributions

正Applied Mathematics-A Journal of Chinese Universities,Series B(Appl.Math.J.Chinese Univ.,Ser.B)is a comprehensive applied mathematics journal jointly sponsored by Zhejiang University,China Society for Industrial and Applied Mathematics,and Springer-Verlag.It is a quarterly journal with     

Journal of Mathematical Research with Applications Guide for Authors

正Journal overview:Journal of Mathematical Research with Applications(JMRA),formerly Journal of Mathematical Research and Exposition(JMRE)created in 1981,one of the transactions of China Society for Industrial and Applied Mathematics,is a home for original research papers of the highest quality in all areas of mathematics with applications.The target audience comprises:pure and applied mathematicians,graduate students in broad fields of sciences and technology,scientists and engineers interested in mathematics.     

Staircase transportation problems with superadditive rewards and cumulative capacities

A cumulative-capacitated transportation problem is studied. The supply nodes and demand nodes are each chains. Shipments from a supply node to a demand node are possible only if the pair lies in a sublattice, or equivalently, in a staircase disjoint union of rectangles, of the product of the two chains. There are (lattice) superadditive upper bounds on the cumulative flows in all leading subrectangles of each rectangle. It is shown that there is a greatest cumulative flow formed by the natural generalization of the South-West Corner Rule that respects cumulative-flow capacities; it has maximum reward when the rewards are (lattice) superadditive; it is integer if the supplies, demands and capacities are integer; and it can be calculated myopically in linear time. The result is specialized to earlier work of Hoeffding (1940), Fréchet (1951), Lorentz (1953), Hoffman (1963) and Barnes and Hoffman (1985). Applications are given to extreme constrained bivariate distributions, optimal distribution with limited one-way product substitution and, generalizing results of Derman and Klein (1958), optimal sales with age-dependent rewards and capacities.To our friend, Philip Wolfe, with admiration and affection, on the occasion of his 65th birthday.Research was supported respectively by the IBM T.J. Watson and IBM Almaden Research Centers and is a minor revision of the IBM Research Report [6].