单边算子交换子的加权有界性

利用单边权的外推法,本文得到了由单边算子与Lipschitz函数生成的交换子的加权有界性质,而且给出了判定两类单边极大算子交换子有界性的充分必要条件.     

单边算子的多线性交换子在Triebel-Lizorkin空间上的加权有界性

该文在单边意义下采用权的外推法研究了Calderón-Zygmund奇异积分算子,离散面积函数,Weyl分数次积分与Lipschitz函数生成的多线性交换子从加权Lebesgue空间到加权Triebel-Lizorkin空间上的有界性.     

一类次线性算子在广义Morrey空间上的加权有界性

本证明了如果次线性算子T在Orlicz空间上有介,则也有Morrey空间上有界,该算子包括极大算子和奇异积分算子等重要算子。     

奇异积分和位势积分交换子在极大Morrey空间上的有界性

设齐次空间(X,ρ,μ)上定义一类极大Morrey空间L~(p),θ,λ)(X,μ).此类极大Morrey空间是经典的Morrey空间和极大Lebesgue空间的推广.本文考虑了C-Z积分算子、位势算子与BMO函数生成的交换子在该类极大Morrey空间上的有界性.事实上,这些结果甚至在一般的欧式空间上也是新颖的.     

与分数次积分和具有非光滑的奇异积分算子相关的Toeplitz型算子在Morrey空间的有界性

本文证明了与分数次积分和具有非光滑的奇异积分算子相关的Toeplitz型算子的sharp极大函数估计,做为应用,得到了该算子在Morrey空间的有界性.     

组合KdV方程解在图灵可计算意义下的有界性

运用数学归纳法,Gronwall不等式及方程的守恒量等工具,研究组合KdV方程初值问题解的有界性.首先在schwartz空间得到了方程解及解的任意阶导的上确界可以由初值为变量的图灵可计算函数来控制,由于schwartz空间S(R)是Sobolev空间Hs(R)(s≥0)的稠子空间,结果可以直接推广到sobolev空间Hs(R)(s≥0),所以组合KdV方程解在Hs(R)(s≥0)上确界可以由一个可计算函数来控制,从而为研究解算子的可计算性并运用图灵机计算组合KdV方程的解奠定了基础.     

分数次算子在加权Herz型空间上的有界性

本文证明了具有某种尺寸条件的Ｌ＾ｑ１到Ｌ＾ｑ２有界的分数次次线性算子是Ｋｑ１＾ａ，ｐ（ω１，ω２＾ｑ１）（或Ｋｑ１＾ｑ，ｐ）（ω１，ω２＾ｑ１）到Ｋｑ２＾ａ，ｐ（ω１，ω２＾ｑ２）（或Ｋｑ２＾ａ，ｐ（ω１，ω２＾ｑ２）有界的以及ＨＫｑ１＾ａｐ（ω１，ω２＾ｑ１）（或ＨＫｑ１＾ａｐ（ω１，ω２＾ｑ１）到Ｋｑ２＾ａｐ（ω１，ω２＾ｑ２）（或Ｋｑ２＾ａｐ（ω１，ω２＾ｑ２）有界的。     

2维耗散准地转方程在齐次Morrey型Besov空间的适定性(英文)

本文讨论2维耗散准地转方程在齐次Morrey型Besov空间的初值问题.首先建立齐次Morrey型Besov空间的一个新特征,然后利用此特征和Kato方法,证明当初始值以齐次Morrey型Besov空间内的范数很小时,2维耗散准地转方程对时间的全局解的存在性和唯一性.     

Hausdorff算子在Campanato空间的有界性

研究了几种不同类型的Hausdorff算子在Campanato空间的有界性,并且得到了这些算子在Campanato空间上有界的最佳常数.此外,还讨论了多线性Hausdorff算子在Morrey空间中的有界性.     

Weighted estimates for commutators of one-sided oscillatory integral operators

In this paper, we study the weighted norm inequalities for commutators formed by a class of one-sided oscillatory integral operators and functions in one-sided BMO spaces.     

Local well-posedness for the dispersion generalized periodic KdV equation

In this paper, we set up the local well-posedness of the initial value problem for the dispersion generalized periodic KdV equation: t_∂u+x_∂α|Dx|u=x_∂u², u(0)=φ for α>2, and φ∈Hs(T). And we show that the is a lower endpoint to obtain the bilinear estimates (1.2) and (1.3) which are the crucial steps to obtain the local well-posedness by Picard iteration. The case α=2 was studied in Kenig et al. (1996) [10].     

On some hyperbolic type equations and weighted anisotropic Hardy operators

We introduce a version of weighted anisotropic Morrey spaces and anisotropic Hardy operators. We find conditions for boundedness of these operators in such spaces. We also reveal the role of these operators in solving some classes of degenerate hyperbolic partial differential equations. Copyright © 2016 John Wiley & Sons, Ltd.     

Characterization of the boundedness of generalized fractional integral and maximal operators on Orlicz–Morrey and weak Orlicz–Morrey spaces

We give necessary and sufficient conditions for the boundedness of generalized fractional integral and maximal operators on Orlicz–Morrey and weak Orlicz–Morrey spaces. To do this, we prove the weak–weak type modular inequality of the Hardy–Littlewood maximal operator with respect to the Young function. Orlicz–Morrey spaces contain $L^p$ spaces ($1\le p\le \infty$), Orlicz spaces, and generalized Morrey spaces as special cases. Hence, we get necessary and sufficient conditions on these function spaces as corollaries.     

Hardy and singular operators in weighted generalized Morrey spaces with applications to singular integral equations

We study the weighted boundedness of the multi‐dimensional Hardy‐type and singular operators in the generalized Morrey spaces , defined by an almost increasing function φ(r) and radial type weights. We obtain sufficient conditions, in terms of numerical characteristics, that is, index numbers of the weight functions and the function φ. In relation with the wide usage of singular integral equations in applications, we show how the solvability of such equations in the generalized Morrey spaces depends on the main characteristics of the space, which allows to better control both the singularities and regularity of solutions. Copyright © 2012 John Wiley & Sons, Ltd.     

A KdV6 hierarchy: Integrable members with distinct dispersion relations

In this work we study a hierarchy of KdV6 equation. We derive the KdV6 hierarchy by using the Lenard operators pair. We show that these equations give multiple soliton solutions with distinct dispersion relations.     

Rank 2 commuting ordinary differential operators and Darboux conjugates of KdV

By considering the factorizations (flags) and associated (simultaneous) second order Darboux transformations of the square and cube of an arbitrary second order Schrödinger operator, we generate commuting ordinary differential operators of orders four and six with a singular elliptic spectrum. This procedure generates true rank 2 commutative algebras. Under the KdV flow, each such factorization (flag) leads to an integrable equation for which the corresponding Darboux transformation generates a Lax-type operator as one of a commuting pair of orders four and six with singular elliptic spectrum. Hence, these integrable equations are Darboux conjugates of KdV.     

Dark solitons for a combined potential KdV and Schwarzian KdV equations with t-dependent coefficients and forcing term

In this work we formally derive the dark soliton solutions for the combined potential KdV and Schwarzian KdV equations. The combined KdV and Schwarzian KdV equations with time-dependent coefficients and forcing term are then investigated to obtain dark soliton solutions. The solitary wave ansatz is used to carry out the analysis for both models.     

An Operatorial approach to singular integral equations of a modified type

In this article,the authors discuss a kind of modified singular integral equations on a disjoint union of closed contours or a disjoint union of open arcs.The authors introduce some singular integral operators associated with this kind of singular integral equations,and obtain some useful properties for them.An operatorial approach is also given together with some illustrated examples.     

Some BMO estimates for vector-valued multilinear singular integral operators

In this paper, we prove some BMO end-point estimates for some vector-valued multilinear operators related to certain singular integral operators.