广义Kawahara方程的Cauchy问题

对初值在Besov空间中的广义Kawahara方程(э)tu+αuk(э)xu+β(э)3xu+γ(э)5xu=0进行了研究,其中k是大于4的正整数,证明了对任意的1≤q≤∞,其Cauchy问题在Besov空间Bsk2,q(R)和Bs2,q(R)中局部适定,这里sk=k-8/2k,s＞max(0,sk);对小初值问题几乎整体适定.并证明了如果β=0或βγ＜0,对小初值问题整体适定.     

KdVKS方程的局部适定性（英文）

本文研究了KdVKS方程u_t+δ?_x~3u+μ(?_x~4u+?_x~2u)+α(?_xu)~2=0的Cauchy问题.利用Tao的[k;Z]乘子范数估计的方法,在Sobolev空间Hs(R),s-1中证明了初值问题的局部适定性,结论改进了现有的Biagioni等的结果.     

分数阶趋化模型在临界Besov空间中解的整体存在性北大核心CSCD

该文主要研究如下的分数阶趋化模型:{■_(t)+(-△)^(α/2)=▽·(u▽v)(x,t)∈R^(n)×(0,∞),ε■_(t)v+(-△)^(β/2)v=u,(x,t)∈R^(n)×(0,∞),u(x,0)=u_(0)(x),v(x,0)=v_(0)(x),x∈R^(n)其中α∈[1,2],β∈(0,2],ε≥0.基于分数阶耗散方程在Chemin-Lerner混合时空空间中的线性估计和Fourier局部化方法,作者得到了如下结果:(1)当ε=0时,建立了次临界情形1<α≤2下该模型在Besov空间中的局部适定性和小初值问题的整体适定性,优化了[陈化,吕文斌,吴少华.分数阶趋化模型在Besov空间中解的存在性.中国科学:数学,2019,49(12):1-17]所得适定性结果中正则性和可积性指标的范围.并且还建立了临界情形α=1下该模型在Besov空间中小初值问题的整体适定性;(2)当ε>0时,利用特殊的迭代技巧,作者分别建立了次临界情形1<α≤2和临界情形α=1下该模型在Besov空间中的局部适定性和小初值问题的整体适定性.进一步,利用模型所特有的代数结构,作者还证明了对初值v0无小性条件下解的整体存在性.     

Banach空间上有限时滞退化微分方程的适定性

该文在Lebesgue-Bochner空间L~p(T,X)和周期Besov空间B_(p,q)~s(T,X)上研究二阶有限时滞退化微分方程:(Mu′)′(t)=Au(t)+Bu′(t)+Fu_t+f(t)(t∈T:=[0,2π]),u(0)=u(2π),(Mu′)(0)=(Mu′)(2π)的适定性.利用向量值函数空间上的算子值傅里叶乘子定理,文中给出上述方程具有适定性的充要条件.     

半线性波动方程的周期解(英文)

本文证明如下定理:设(g_1)g∈C(R,R),g(0)=0(g_2)(?)(g(u))/u=α,α∈R,g(u)(?)αu(g_(?))令 q(u)=g(u)-αu或者(1)α≥,q(u)非减或者(2)α≤.q(u)非增则(?)T_o>0,使得对每个 T>T_(?)(T/π是有理数)问题(?)至少有一个非平凡弱解 u∈L~∞.     

Besov空间到Zygmund空间上的加权复合算子

研究了单位圆盘上的Besov空间B_(p,q)到Zygmund空间Z的加权复合算子u C_φ(u∈Z),利用函数空间上的算子理论相关知识,得到了u C_φ:B_(p,q)→Z的有界性和紧性的充分必要条件.     

精细Besov空间

本文将Besov空间Bsp,q推广为精细Besov空间RBap q,其中s∈R,而α∈Rk+1,k为非负整数.给出了精细Besov空间的等价拟范数和嵌入定理.同时证明了在Bsp,q和∪ B;,q之间还存在无t＞s穷多个精细Besov空间作为真子空间.     

Banach空间中二阶退化微分方程的周期解

本文在Lebesgue-Bochner空间Lp(T,X)和周期Besov空间Bs p,q(T,X)中研究二阶退化微分方程[Mu′]′(t)-a Au(t)-αAu′(t)=f(t)(t∈T:=[0,2π]),u(0)=u(2π),(M u′)(0)=(M u′)(2π)的适定性.用算子值Fourier乘子定理给出方程具有适定性的充分或者必要条件.     

Boussinesq方程组在Besov空间中局部解的存在性和延拓准则

本文研究二维无粘性Boussinesq方程组在超临界Besov空间B_(p,q)~s(R~2),s>1+2/p,1相似文献   

重调和函数的平均值性质

设Ω是 C~n 中的有界对称域,f=u jv 是Ω上的全纯函数,f(0)∈R.记(?)_(p,q,α)=(?)(1-r)~(qα-1)M_p~(?)(r,f)dr(?)~(1/q).本文证明了(?)_(p,q,α),≤C(?)_(p,q,a)(00).     

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 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.     

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].