一类分数次次线性算子及其交换子在齐型空间上的弱Morrey-Herz空间上的有界性

本文研究了一类次线性算子及其交换子在齐型空间上的弱有界性的问题.利用齐型空间的基本性质以及给出的一类次线性算子及其分别与BMO函数,Lipschitz函数生成的交换子在L~p(X)上的弱有界性,证明了其在齐型空间上Morrey-Herz空间中的弱有界性.推广了该类算子在Morrey-Herz空间中的强有界性这一结果.     

一类Schrdinger型算子在关于非负位势的变指数Morrey空间上的有界性（英文）

本文考虑了一类Schr?dinger型算子和其交换子的有界性问题.利用其在L~p空有界性间上的,获得了一类Schr?dinger型算子和其交换子在变指数Morrey空间上的有界性.     

一类Schrödinger型算子在关于非负位势的变指数Morrey空间上的有界性

本文考虑了一类Schrödinger型算子和其交换子的有界性问题.利用其在Lp空有界性间上的,获得了一类Schrödinger型算子和其交换子在变指数Morrey空间上的有界性.     

Herz型空间上的分数次Hardy算子的交换子(英文)

本文主要对分数次Hardy算子和Lipschitz函数产生的交换子进行研究,得到了它在一类Herz型和Morrey-Herz型空间上的有界性.进一步还讨论了高阶交换子在这类空间上的有界性.     

加权Hardy算子及其交换子在广义Morrey空间上的有界性

讨论了加权Hardy算子,Cesàro算子及它们与BMO函数生成的交换子的有界性.在假设ω(r)满足一类条件时,得到了这些算子及它们的交换子在广义Morrey空间上有界,且证明了这类条件是必要的.     

由Campanato型函数和与薛定谔算子相关的Riesz变换生成的Toeplitz算子的有界性（英文）

本文研究了由Campanato型函数及与Schrdinger算子相关的Riesz变换生成的Toeplitz算子的有界性.利用Sharp极大函数估计得到了Toeplitz算子θ~b在Lebesgue空间的有界性,拓广了已有交换子的结果.     

齐次Morrey-Herz空间上交换子的有界性

本文研究了高阶交换子的有界性, 利用截断算子方法和函数分解技术, 在齐次Morrey-Herz空间上, 得到了由次线性算子与BMO函数生成的高阶交换子的有界性以及卷积类算子高阶交换子的有界性.     

极大算子交换子在各向异性Morrey-Herz空间上的有界性

本文引进了伴随伸缩矩阵A的各向异性齐次Morrey-Herz型空间,利用Hardy-Littlewod极大算子交换子的Lp有界性,证明了Hardy-Littlewod极大算子交换子在各向异性齐次Morrey-Herz型空间上的有界性,对于分数次Hardy-Littlewod极大算子交换子也得到了类似的结果.     

非倍测度条件下Marcinkiewicz积分及其交换子在Morrey空间中的有界性

讨论了测度μ在满足非倍条件下,Marcinkiewicz积分算子及其与RBMO（μ）函数、Lipschitz函数生成的交换子的有界性,通过Marcinkiewica积分及该交换子在Lebesgue空间中的有界性,得到了该算子及交换子在非齐型空间上的Morrey空间中的有界性．     

一类Schrdinger型算子在Herz-Morrey空间上的有界性

考虑了一类Schrdinger型算子Tβ及其交换子的有界性问题.基于其在经典Lebesgue空间上的有界性,利用分环技巧对Tβ及其与b(b∈BMO_σ(ρ))生成的交换子[b,Tβ]进行估计,得到了它们在Herz-Morrey空间上的有界性.     

Localized Frames and Compactness

We introduce the concept of weak localization for continuous frames and use this concept to define a class of weakly localized operators. This class contains many important classes of operators, including: short time Fourier transform multipliers, Calderon–Toeplitz operators, Toeplitz operators on various functions spaces, Anti-Wick operators, some pseudodifferential operators, some Calderon–Zygmund operators, and many others. In this paper, we study the boundedness and compactness of weakly localized operators. In particular, we provide a characterization of compactness for weakly localized operators in terms of the behavior of their Berezin transforms.     

J—自共轭微分算子谱的定性分析

本文对J－自共轭微分算子谱理论研究情况做一些概要性的介绍,第一部分简要回顾了J－自共轭微分算子理论研究的发展过程,第二,三部分介绍了J－自共轭微分算子的本质谱和离散谱定性分析的主要方法和结论;第四部分扼要叙述J－自共轭微分算子其它方面的一些工作,以及J－自共轭微分算子谱理论研究中尚待解决的问题。     

Some characterizations of almost Dunford–Pettis operators and applications

This paper attempts to deal with some characterizations of almost Dunford–Pettis operators from a Banach lattice into a Banach space. It also discusses some of the consequences derived from this study. As an application, we generalize some results of Meyer-Nieberg on the duality between semi-compact operators and order weakly compact operators.     

Evolution semigroups and time operators on Banach spaces

We present new general methods to obtain shift representation of evolution semigroups defined on Banach spaces. We introduce the notion of time operator associated with a generalized shift on a Banach space and give some conditions under which time operators can be defined on an arbitrary Banach space. We also tackle the problem of scaling of time operators and obtain a general result about the existence of time operators on Banach spaces satisfying some geometric conditions. The last part of the paper contains some examples of explicit constructions of time operators on function spaces.     

A new approach to improve the order of approximation of the Bernstein operators: theory and applications

This paper presents a new approach to improve the order of approximation of the Bernstein operators. Three new operators of the Bernstein-type with the degree of approximations one, two, and three are obtained. Also, some theoretical results concerning the rate of convergence of the new operators are proved. Finally, some applications of the obtained operators such as approximation of functions and some new quadrature rules are introduced and the theoretical results are verified numerically.     

Banach 空间上算子的几种不可约性

本文根据Cowen-Douglas 算子的定义引入两类与强不可约算子有紧密联系的算子类— B_n 算子与B 算子. 说明了在可分Banach 空间上存在B_n 算子与B 算子. 文章详细讨论了几种具有不可约性的算子类之间的关系并得到了一个关系图. 本文还给出这些算子类的一些性质, 包括算子的(拟) 相似不变性等.     

Generalized intuitionistic fuzzy geometric aggregation operators and their application to multi-criteria decision making

In this paper, we extend the generalized weighted geometric and generalized ordered weighted geometric operators to intuitionistic fuzzy environments, that is, we develop a series of generalized intuitionistic fuzzy geometric operators to aggregate input arguments that are expressed by intuitionistic fuzzy values based on Archimedean t-conorm and t-norm. Then some desired properties of these aggregation operators are investigated. The relations between these operators and some existing intuitionistic fuzzy geometric aggregation operators are discussed in detail. Furthermore, applying these proposed operators, we develop an approach for multi-criteria decision making with intuitionistic fuzzy information. Finally, a practical example is given to verify the developed approach and to demonstrate its practicality and effectiveness.     

Norm Inequalities for Fractional Integral Operators on Generalized Weighted Morrey Spaces

Considering a class of operators which include fractional integrals related to operators with Gaussian kernel bounds,the fractional integral operators with rough kernels and fractional maximal operators with rough kernels as special cases,we prove that if these operators are bounded on weighted Lebesgue spaces and satisfy some local pointwise control,then these operators and the commutators of these operators with a BMO functions are also bounded on generalized weighted Morrey spaces.     

Heavy OWA Operators

We recall the OWA operator and discuss some of the features used to characterize these operators. In passing we introduce an new characterizing attribute called the divergence. We then consider two cases of information fusion and use these as motivation to generalize the OWA operator with the introduction of the Heavy OWA operator. These HOWA operators differ from the ordinary OWA operators by relaxing the constraints on the associated weighting vector. We consider some applications of these HOWA operators and provide some examples of weighting vectors associated with these HOWA operators.     

Some properties of graphs of closed operators

In this paper we study some properties of graphs of closed operators in Hilbert spaces. We construct representations of von Neumann algebras induced by graphs of closed operators. We describe some classes of closed operators in terms of their characteristic matrices and study some properties of operations on graphs of closed operators.