矩阵方程AXB+CYD=E的自反解与反自反解

讨论了线性矩阵方程AXB+CYD=E的自反(反自反)解,给出了它有自反(反自反)解的一个新充要条件,以及自反(反自反)解的一般表达式.利用此结果研究了该矩阵方程在某些特殊情况下的自反(反自反)解.     

矩阵方程的反Hermite自反矩阵问题的解

通过广义奇异值分解定理,得到了矩阵方程AHXA=B的反Hermite-自反解存在的一个充要条件,并导出了这个矩阵方程的与已知矩阵最佳逼近的反Hermite-自反解,最后相应地获得了方程的最小范数解.     

矩阵方程AHXA=B的反Hermitian反自反解及其最佳逼近

通过广义奇异值分解定理,得到了矩阵方程A^HXA=B的反Hemaitian反自反解存在的一个充要条件,并导出了这个矩阵方程与已知矩阵最佳逼近的反Hemaitian反自反解和最小范数解．     

关于广义Sylvester矩阵方程反自反解的有限迭代算法

研究了广义Sylvester矩阵方程的广义反自反解,并给出了求其广义反自反解的一种新的有限迭代算法.通过此迭代法,可自动确定矩阵方程是否存在广义反自反解.此外,还讨论了给定矩阵基于Frobenius范数的近似解,从而推导出与给定广义Sylvester矩阵方程等价的矩阵方程的最佳逼近解.最后,用数值算例验证了该算法的有效...     

矩阵方程AXB＋CXTD=E自反最佳逼近解的迭代算法

为了求Sylvester矩阵方程AXB＋CXTD=E自反（或反自反）的最佳逼近解,提出了一种利用复合最速下降法的迭代算法。不论矩阵方程AXB＋CXTD=E是否相容,对于任给初始自反（或反自反）矩阵Xo,此算法都可以计算出该方程自反（或反自反）的最佳逼近解X。最后,通过两个数值例子验证了算法的可行性。     

一类四元数矩阵方程的最小二乘解

利用广义自反矩阵和广义反自反矩阵的性质讨论了线性方程组AX=b和矩阵方程AX=B的最小二乘解问题.当A为广义自反矩阵或广义反自反矩阵时,可将线性方程组AX=b的最小二乘解问题化为两个较小独立的子问题;当A、B都是广义自反矩阵或广义反自反矩阵时,可将矩阵方程AX=B的最小二乘解问题化为线性方程组的最小二乘解问题,从而使这些问题的讨论得到简化.     

Riccati矩阵方程异类约束解的迭代算法

首先研究了Riccati矩阵方程中变量矩阵为对称矩阵和自反矩阵异类约束解问题,其次采用牛顿算法将Riccati矩阵方程异类约束解转化为线性矩阵方程的异类约束解,最后采用修正共轭梯度算法(MCG)解决了线性矩阵方程异类约束解或者是最小二乘解问题.     

求矩阵方程AXB+CYD=E自反最佳逼近解的迭代算法

利用复合最速下降法的迭代算法对基于自反矩阵(或反自反矩阵)下广义Sylvester矩阵方程AXB+CYD=E最佳逼近解进行了研究,证明了无论矩阵方程AXB+CYD=E是否相容,该算法都可以用于计算其最佳逼近解.最后,通过2个数值实验证明了该算法的可行性.     

矩阵方程AXA~T=B的对称反自反最小二乘解

给定对称正交矩阵P,利用矩阵的标准相关分解,研究了矩阵方程AXAT=B的对称反自反最小二乘解,得到了最小二乘解的一般表达式。     

矩阵方程AXA^T=B的对称反自反最小二乘解

给定对称正交矩阵P，利用矩阵的标准相关分解，研究了矩阵方程AXA^T=B的对称反自反最小二乘解，得到了最小二乘解的一般表达式。     

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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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