距离函数的可微性研究

在一个赋范线性空间中,非空闭子集K的性质与距离函数d(x)的性质紧密相关。若X是一个Banach空间,K是X的非空闭凸集,X上的范数一致Gateaux(Frechet)可微,则d(x)在X的稠子集X\bdyK上是Gateaux(Frechet)可微。在一定的条件下,d(x)在X的每一点都是Gateaux(Frechet)可微。     

关于函数一致可微性的几个定理

函数的可微性是高等数学中的基本概念之一,以它作为工具能较好地研究函数的性态.本文从已有的函数一致可微的定义出发总结并证明了函数一致可微的充要条件及充分条件.     

一类拟可微函数的优化算法

本文对于一类形如F(x)=g(x,maxΦ_(ij)(x),…,maxΦ_(mj)(x))+h(x)的拟可微函数(在Demyanov和Rubinov意义下)给出了一种优化算法,其中g,Φ_(ij)分别为R~(m+n)和R~n上的连续可微函数,且g(x,y_1,…,y_m)关于每一个y_i都是非增的,h(x)为R~n上的凸函数。     

一种求解一类拟可微函数极小化问题的算法

本文对一类形如F(x)=g(x, (?)(x),…,(?)(x))+h(x)的拟可微函数(在Demyanov和Rubinov意义下),给出了一种优化算法,并证明了算法的收敛性。这里g,φ_(ij)分别为R~(m+n)和R~n上的连续可微函数,h(x)为R~n上的凸函数。     

论复合函数的可微性与可积性

通过实例主要论述以下两个结论：1．可微函数与可微函数两复合只是复合函数可微的一个充分条件而非必要条件;2．可积函数与可积函数复合既不是它们复合函数的充分条件也不是必要条件。     

一个超可微函数空间中的稠密性问题

利用Fourier变换和Paley-wiener定理考察w-超可微函数的结构问题,证明了w-超可微函数空间D[w](Ω)在基本空间D(Ω)中是稠密的.     

G映象的不动点指数和G_(γ~-)紧映象的不动点定理

本文引入了集值PF-映象,G映象,G_(γ~-)紧映象和集值映象的半可微概念,建立了G映象的不动点指数理论并获得了G_(γ~-)紧映象和具有半导数的G_(?)紧映象的许多非零不动点定理.     

一类拟可微函数在一点处可微性判别及在不可微优化中的应用

对于拟微分为有限点集凸包的拟可微函数 ,给出了判别其在任一点处是否可微的一种算法 .将此算法作为不可微优化的子算法 ,可得到不可微优化的一种可执行算法 .特别指出 ,所讨论的函数类包含光滑函数的极大值复合函数 .     

利用微分方程求解函数方程

讨论了5类函数方程的解为初等函数的限制条件,以函数在x=0(或x=1)处可微为限制条件给出结论,并通过求解微分方程的方法给出证明.     

关于一类不可微约束规划高阶算法的探讨

针对在线性约束条件下，目标函数形如有限个可微函数之极大值函数与可微函数 之和的不可微约束规划，提出一个能采用任何一种目标函数近似二阶模式构造，以及 任何一种期望得到Ｎｅｗｔｏｎ类步设想的算法，由算法中的保护措施，使在有效的情 况下发挥二阶近似的作用，而在不利的情况下仍能保证全局收敛性．同时，利用ε－广 义方向导数和光滑极小化中的变尺度思想提出两种期望得到Ｎｅｗｔｏｎ类步的模式。     

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.     

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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