映射的(F)导映射和正规对偶映射

本文建立了局部凸空间到局部凸空间中连续映射的(F)导映射的概念,得到了紧映射的(F)导映射仍是紧映射的结论(包括在有穷点和无穷远点处的不同情形),同时讨论了正规对偶映射及体锥中的一个投影拟距离问题。     

基于已有映射结果的本体映射

为了提高本体映射的查准率和查全率,提出基于已有映射结果的本体映射算法.该算法以已有映射结果为背景知识,应用多种启发式策略选择中间本体,将直接映射结果与通过中间本体的间接映射结果相结合,并利用迭代优化算法克服背景知识不准确对映射结果的影响.实验结果表明: 该方法比直接映射方法的查准率和查全率分别提高1.10%和2.52%.说明该方法可以有效地提高映射的查准率和查全率.     

映射的应用

探讨了在教学过程中如何运用映射概念解决具体问题 .     

下层映射与上层提升映射的关系

本文讨论下层空间的映射与它在上层空间的提升映射的连续性之间的关系。对Z.Michael给出的一个有关的定理[25],本文放宽其要求条件,得到与该定理相同的结论。     

拟阵之间的强映射与秩强映射

引入了拟阵间的秩强映射、反射闭集映射(RC映射)和强映射等概念,研究了它们的一些基本性质.证明了秩强映射和RC映射等价;一个映射是拟阵间的强映射当且仅当它是相应扩张拟阵间的秩强映射;以秩强映射或强映射为态射的拟阵范畴中的范畴同构都是拟阵同构.这些结果为进一步研究拟阵的范畴性质奠定了一定基础.此外,还修正了Welsh关于强映射的定义.     

矩阵代数的乘法映射与反乘法映射

设P是一个域,Γn是满足{αEij|i,j=1,2,…,n,α∈P} (P)的一个乘法半群,其中Mn(P)定义P上所有n×n矩阵组成的乘法半群.证明了一个结果:若f:Γn→Mn(P)是一个保零矩阵的乘法映射,Fij(i,j=1,2,…,n)是Mn(P)中n2个矩阵,且满足FijFkl=δjkFil(i,j,k,l=1,2,…,n),则存在可逆阵S∈Mn(P),使得f(Fij)=S-1FijS,i,j=1,2,…,n.由此刻画了Γn的保迹反乘法映射.     

多齿映射和多角映射的迭代移位

利用ｘ ∈［０ ,１］ 的ｒ － 进位展开,ｘ ＝ ａ１ｒ ＋ ａ２ｒ２ ＋ …＋ ａｎｒｎ ＋ …　　　ａｎ ∈｛０ ,１ ,…,ｒ － １｝ ,１ ＜ ｒ ∈Ｎ证明了多齿映射Ｓｒ（ｘ） ＝ Ｆｒａｃ（ｒｘ） ,　　０ ≤ｘ ≤１和多角映射Ｔｒ（ｘ） ＝Ｓｒ（ｘ） ,　２ｊ － ２ｒ ≤ｘ ≤２ｊ－ １ｒ ,　ｊ ＝ １ ,２ ,…, ｒ ＋ １２２ｊ － ｒｘ ,　２ｊ － １ｒ ≤ｘ ≤２ｊｒ ,　ｊ ＝ １,２ ,…, ｒ２是移位映射,从而是混沌映射．     

多齿映射和多角映射的子移位

考虑多齿映射Ｓｒ（ ｘ） 和多角映射Ｔｒ（ｘ） 在单位区间的某些子集上的子移位．特别，ｒ 可以推广到有理数ｑｐ 的情形，对映射Ｓｑ／ ｐ（ｘ） 和Ｔｑ／ ｐ（ｘ） 也得到某些结果．     

几种弱于连续映射的映射

较详尽地讨论了连续映射、几乎连续映射(a.c.s)、几乎连续映射(a.c.h)、弱连续映射、半连续映射、近似连续映射之间的相互关系,改进了文[3]的某些结果。     

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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