一类求解变分不等式和平衡问题的迭代序列的强收敛定理

给出了一种改进的迭代算法,可用于求解变分不等式和平衡问题,并证明了此迭代序列的强收敛性;推广了文献[1]和[3]的结果.     

耦合Sylvester矩阵方程的改进的梯度迭代算法

本文通过构造矩阵分裂,结合线性系统的迭代方法,提出了求解耦合Sylvester矩阵方程的两种梯度迭代算法,并研究了这两种算法在满足初始迭代条件下的收敛性.最后给出数值算例验证了这两种算法的有效性.     

加权广义逆矩阵的迭代算法

简要讨论了加权Ｍｏｏｒｅ－Ｐｅｎｒｏｓｅ广义逆矩阵的一些基本性质：给出了计算加权Ｍｏｏｒｅ－Ｐｅｎｒｏｓｅ广义逆矩阵的四种迭代算法，其中两种为线性算法，另外两种为高阶算法：讨论了诸算法间的相互关系，给出了高阶算法的一种较好的初始矩阵；讨论了诸算法的收敛性条件，给出了最佳的迭代参数；最后．讨论了算法在求解加权最小二乘问题中的应用。     

极大熵原理与互补问题的一种迭代算法

把基于信息理论的极大熵原理应用到互补问题的一种等价的不动点格式中,构造了一种光滑的迭代算法,给出了迭代算法收敛的充要条件.对于对称单调的互补问题,给出了收敛的充分条件.扩充了原来的梯度投影法要求严格单调的限制,得出了与外梯度投影法类似的收敛性条件.最后,给出了数值算例,包括标准互补问题考题和随机生成的考题,并给出了该光滑迭代算法与外梯度投影法的数值比较.     

多个正态总体均值与标准差比在简单树序约束下的最大似然估计

考虑k(k>3)个正态总体均值与标准差(均值和标准差均未知)之比在简单树序约束下最大似然估计的求解问题, 应用保序回归理论给出了计算均值和标准差最大似然估计的迭代算法, 并证明了所给迭代算法是收敛的, 给出了k=7时利用迭代算法的模拟结果.     

求多机电力系统机械振模的新型迭代算法

本文给出了求多机电力系统全部机械振模的一种新型迭代算法。该算法针对多机系统机电模型的系统矩阵A的特点,采用一种恰当的迭代方案求取矩阵A的全部特征根(机械振模)。对初始近似迭代点准确选择保证了迭代的收敛性和高效率,同时还可以求取某一指定的机械振模。最后我们给出了一个十机系统的实例计算,结果表明此算法是有效的。     

工业过程稳态优化中的PID型迭代学习控制

给出一种PID型迭代学习算法．对工业过程稳态优化中的动态施行迭代学习控制，加快了动态响应，提高了控制效果．从理论上分析了算法的收敛性，并给出数字仿真结果．     

多个正态总体均值与标准差比在简单树序约束下的最大似然估计

考虑k(k>3)个正态总体均值与标准差（均值和标准差均未知）之比在简单树序约束下最大似然估计的求解问题, 应用保序回归理论给出了计算均值和标准差最大似然估计的迭代算法, 并证明了所给迭代算法是收敛的, 给出了k=7时利用迭代算法的模拟结果.     

带子矩阵约束的二次逆特征值问题的最小二乘埃尔米特广义斜哈密顿矩阵迭代解

针对带子矩阵约束的二次逆特征值问题的最小二乘埃尔米特广义斜哈密顿结构矩阵解问题,给出了一种共栀梯度迭代算法.首先提出了带子矩阵约束的二次逆特征值问题的最小二乘问题及其最佳逼近问题;然后分别给出了基于共轭梯度的迭代算法,证明了算法的收敛性.对于任意初始约束矩阵,在不存在舍入误差的情况下,用该迭代算法可以在有限步迭代中得到...     

基于A-极大单调算子的3步近似点迭代算法

介绍了用3步近似点迭代算法研究A-极大单调算子的不动点问题和用预解算子研究包含问题的解.同时给出了在某些条件下,三步迭代算法的收敛性.     

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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