基-序列中紧空间的若干性质

推广文献(Top Appl,2003,128(2/3):145-156.)引入的基-仿紧空间的概念,引入基序列中紧空间:空间X称为基-序列中紧空间,如果X有一个基B,满足|B|=w(X),且对X的任意开覆盖U,都存在B’■B,B’是U的收敛序列有限的开加细.它是基-仿紧性和序列中紧性的推广.通过构造空间X的基的收敛序列有限的开加细,主要研究了基-序列中紧空间的性质,证明了:1)基-序列中紧空间与其他基覆盖性质间的蕴含关系;2)在完备映射下基-序列中紧性是逆保持的;3)基-序列中紧空间的乘积性质等.所得结果不仅推广了基-仿紧空间的性质,在理论上也完善了拓扑空间的基-覆盖性质.     

关于具(A1)公理的拓扑群中集合的紧性

研究了具(A1)公理的拓扑群中集合的相对紧、全有界和序列紧之间的关系,给出了具(A1)公理的拓扑群中集合相对紧的充分必要条件为该集合是序列紧的.     

群作用下逆极限空间和乘积空间中的强G-跟踪性

给出了拓扑群作用下度量空间中强G-跟踪性的概念,研究了拓扑群作用下逆极限空间和乘积空间中强G-跟踪性的动力学性质,得到如下结论: (1)若(X_f, G, d, σ)是系统(X, G, d, f)的逆极限空间,则f具有强G-跟踪性当且仅当σ具有强-跟踪性;(2)f₁×f₂具有强G-跟踪性当且仅当f₁具有强G₁-跟踪性,f₂具有强G₂-跟踪性.这些结论弥补了拓扑群作用下逆极限空间和乘积空间中强G-跟踪性理论的缺失.     

乘积空间的自同伦等价群的子群

主要研究拓扑空间X,Y的乘积X×Y的自同伦等价群的子群$\mathscr{E}_\#(X\times Y)$ 与$\mathscr{E}_\Omega(X\times Y)$以及它们的p-局部化情形, 得到了相应可裂的短正合序列. 其中p为素数.     

粗拓扑空间的Higson紧化

研究局部紧Hausdorff空间X的Proper粗结构及其相应的Higson紧化,并证明X的Stone-Cech紧化和一点紧化分别是X关于紧子集粗结构和Proper粗结构的Higson紧化．同时研究Higson紧化在粗拓扑空间范畴的函子性质,并用这种函子性质刻画了Higson紧化的逆极限．特别地,证明了Stone-Cech紧化是某些Higson紧化的逆极限．     

可分离公理的三空间性

在拓扑代数一些基本定义及基本性质的基础上,讨论了拓扑群中的群扩张理论,研究了可分离公理的三空间性质.利用逆纤维性质,得出了满足T_1公理是三空间性质;给出了T_2公理和T_3公理成为三空间性质的条件.结果表明:T_2T_3公理在不变子群是既开又闭的条件下可以扩张到整个拓扑群上.     

模糊拓扑空间中的序列紧

本文在[4]中的邻域的基础上引进模糊拓扑空间的序列紧,并探讨该种紧性与[2]中的紧、可列紧之间的关系。     

拓扑系统范畴完备性与Tychonoff乘积定理

拓扑系统是目前最广泛的拓扑学研究对象,它以点集拓扑空间、Locale的空间化、模糊拓扑空间与拓扑分子格为特例,用它可研究计算机程序设计语言指称语义的Domain理论．本文旨在建立拓扑系统范畴的乘积结构与等子结构,表明拓扑系统范畴是完备范畴．讨论拓扑系统的紧性,得到了拓扑系统关于紧性的Tychonoff乘积定理．     

关于序列紧空间上连续自映射的ω-极限点

在一般拓扑空间上研究拓扑动力系统的轨道渐近性质．证明了以下结果：设X是序列紧空间,f是X上的连续自映射,点x的ω-极限集ω（x,f）为有限集当且仅当它是,的一个周期轨．作为推论,在紧空间和可数紧空间中也有完全相同的结果．     

L-fuzzy强P不定序同态

在Ｌ－ｆｕｚｚｙ拓扑空间引入了强ｐ不定序同态概念,得到了若干良好的性质与特征。如：连通集与良紧集的强Ｐ不定像分别是Ｉ＊型强连通集与Ｐ紧集;准Ｌｉｎｄｅｌｏｆ空间的满强Ｐ不定像是Ｐ准Ｌｉｎｄｅｌｏｆ空间;ＰＴｉ空间在单满强Ｐ不安序同态下的逆偈是Ｔｉ空间（ｉ＝－１,０,１,２）等。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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