关于线性方程组A_(mn)X_(n1)=B_(m1)相关问题的探讨

在求解线性方程组时通常采用矩阵的初等变换的方法,或当系数矩阵可逆时利用逆矩阵进行求解.讨论一种新的线性方程组的矩阵解法,即利用矩阵广义逆的理论求解线性方程组.分析满秩矩阵、弱逆矩阵定义,利用一个矩阵是另一个矩阵的弱逆阵的充要条件得出任意m×n矩阵必有弱逆阵且不唯一的结论,给出弱逆阵的求法,进而给出了线性方程组一种新的矩阵解法.     

结构对初始条件的动力响应的一种算法

从标准坐标变换方程出发，引入广义逆矩阵的求解方法，提出结构对初始条件的动力响应的一种新算法．这种算法回避开结构质量矩阵，以截断频率和对应的模态参数为输入，通过截断标准振型长方矩阵［Φ］的直接广义逆阵求解，求得结构对初始条件的动力响应．这一方法可用于已得到结构低阶模态参数而需进一步通过计算获得结构对初始条件的动力响应这一类工程中实际存在的问题．算例表明，精度满足工程要求．     

次-矩阵的若干广义逆性质

本文给出次-矩阵(次共轭转置、次Hermite、次规范及次值域Hermite矩阵)的若干广义逆性质。作为本文的重点我们讨论了下列四个问题:①怎样判定一个方阵B是否次值域Hermite矩阵;②次值域Hermite矩阵与值域Hermite矩阵的关系;③次值域Hermite阵的群逆是否一定存在的问题;④若次值域Hermite阵B的群逆存在,此群逆与相应的值域Hermite阵A的群逆的关系。     

广义逆矩阵及其应用

由普通的逆矩阵推广到广义逆矩阵,进而研究广义逆矩阵的几类形式．在广义逆矩阵基础上,讨论了广义逆矩阵在线性方程组求解中的应用．     

块──Cayley-Hamilton定理的一些新的应用

利用块──Cayley－Hamilton定理得到一类各子块是两两可换的分块阵A的广义逆：加权Moore－Penrose逆、Moore－Penrose逆、Drazin逆及群逆的表达式和计算它们的块有限算法,本算法中需计算一个与给定矩阵的子块同阶的矩阵之逆阵．     

反循环矩阵的群逆

文［ｌ］给出了循环矩阵非奇异的充分必要条件．本文给出了反循环矩阵非奇异的充分必要条件和逆阵表达式．同时．对奇异反循环矩阵给出了奇异｛ｌ｝一逆，Ｍｏｏｒｅ－ｐｅｎｒｏｓｅ广义逆及群逆表达式．     

广义主正阵与广义完全主正阵

引进了有广泛一般性的广义主正阵与广义完全正阵的概念，给出了这两类矩阵的基本的性质，得到了关于广义主正阵，广义完全正阵的逆阵，证明了关于它们非异主子阱的Ｓｃｈｕｒ补以及Ｓｙｌｖｅｓｔｅｒ矩阵、三角分解等方面的若干基本结果。     

完全模糊线性系统的模糊近似解

对完全模糊线性系统A⊕x=b,当A为模糊方阵或模糊长方阵时进行了讨论.扩充了LR-模糊数的定义,讨论了完全模糊线性系统的模糊近似解和非负模糊近似解,并应用矩阵的广义逆阵A一,讨论了广义完全模糊线性系统的模糊近似解和非负模糊近似解.最后给出了具体算例.     

广义预测控制的改进算法

本文通过一种快速的广义预测控制算法避免了Diophantine方程的在线求解,并将复杂的大矩阵求逆问题简化为简单的对角阵求逆,大大减小了控制器的运算负荷,有利于广义预测控制在快速系统中的应用。     

求解首尾差循环矩阵逆与广义逆的快速算法

提出首尾差循环矩阵的概念,利用多项式矩阵的初等变换理论给出了首尾差循环矩阵求逆阵及广义逆的一种快速算法。     

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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