模同态的弱广义逆

将[1]中提出的具体范畴中态射的弱广义逆的概念应用于模范畴,给出模的正则同态的弱广义逆的一般刻划,研究了唯一性问题,确定了线性变换的弱了义逆与Moore—Penrose逆的关系。特别,幂等线性变换是它自身的一个弱广义逆。最后,证明了[4]中提出的“线性变换关于S、T的广义逆”是我们的弱广义逆的特例。     

矩阵的B-D-MP逆

文章参考方阵A的互补广义逆A(-1)T,S,推出了一些相关性质;然后在此基础上定义了一个新的广义逆B-D-MP逆。这个新的广义逆由复数域上的方阵与它的互补广义逆及M-P逆结合而成。B-D-MP逆将核逆和DMP逆的条件进行弱化,将这两类新定义的广义逆包含其中,不再有指数的限制,只需要是复数域上的方阵即可。该文最后给出这个新的广义逆一些相关性质。     

关于半环上矩阵的广义逆

探讨了半环上矩阵的广义逆、{1,2}-逆与M-P逆.分别给出了半环上矩阵存在广义逆与{1,2}-逆的等价条件.同时证明若M-P逆存在,则它是唯一的.     

广义逆矩阵表达式及计算

本文主要从矩阵的初等变换分解式中给出满足一个条件的广义逆矩阵的一般表达形式,并用Excel的数组公式来具体计算一个给定矩阵A的广义逆矩阵,简介广义逆矩阵在解线性方程组方面的应用。     

有限维欧氏空间上线性映射的广义逆

线性映射和广义逆是高等代数很重要的研究对象．线性变换的广义逆被普遍研究,而线性映射的广义逆性质研究地很少．应用共轭映射的性质,给出了欧式空间商线性映射的广义逆的定义,并研究它的若干性质。这些性质对学生的学习有一定的帮助作用．     

矩阵Padé逼近的一种算法

原有的广义逆矩阵Padé逼近(GMPA),由于要计算较为复杂的行列式,计算量很大。文章将Padé逼近的一些性质推广到广义逆矩阵Padé逼近的情形,给出了广义逆矩阵Padé逼近的一个算法,它可以由较简单的对角广义逆矩阵Padé逼近递推地计算出其它类型的广义逆矩阵Padé逼近     

加权α-β广义逆的定义及其计算方法

文中引入对正定算子M、N的加权a-β广义逆。而且给出了此广义逆的一些性质。然后又得到了几个计算该加权a-β广义逆的迭代方法。而且这些迭代条件教师充分必要的。如果a、β为欧几里德范数，而且M=N=I，那么此加权a-β广义逆就变为一般的广义逆A^ 。这样[8]中的结果就是该文的特殊情形。在文章的最后，给出了一个数值例子，还验证了一些性质。     

基于广义逆理论的转角信息重构近似算法

针对结构识别中转角信息难以测量的问题,完善了一种基于广义逆理论的转角信息重构问题近似算法.该算法从静力凝聚的基本方程出发,求解广义逆矩阵,由结构的位移测量信息计算结构的转角信息.通过理论分析给出了广义逆理论近似算法的适用条件和广义逆解答是精确解答的条件.数值算例表明:该近似算法的范数误差一般较小,而绝对量较小的分量误差较大.     

广义逆A(2)T,S的一般扰动和范数扰动

对广义逆A(2)T,S的一般扰动问题,得到了T和S在都有扰动的情况下广义逆A(2)T,S的连续性,其中,Im(G)=T,Ker(G)=S,同时对广义逆A(2)T,S在连续的条件下的范数扰动理论进行了进一步的探讨.     

环逆代数—一般环的等效系统

推广了广义结合ＢＥＩ－代数系统，引入环逆代数的概念，该类代数与一般环中加法的“逆”有密切关系，故称之为环逆代数。本文主要证明了环逆代数与一般环间的一一对应关系，从而说明环逆代数是一般环的等效系统。     

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     

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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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has