快慢型Van der Pol系统动力学行为的慢流形控制

针对快慢型Van der Pol系统，提出了注入反馈的慢流形控制方法．从几何角度出发，参照系统慢流形选择控制参数，就能将Van der Pol系统控制到指定的平衡态或振荡周期轨道上．     

论二次曲面的奇点

首先证明了微分几何中一般曲面之奇点的定义与二次曲面的奇点的定义的一致性，并证明了二次曲面有奇点的充要条件是其中心在曲面上，在此基础上．对五类典型的二次曲面的奇点的分布规律进行了系统的讨论，得出了奇点存在的几个充分必要条件。     

Amagat气体化学反应体系中多定态转变的孤立圈及尖点分支的退变

用Ａｍａｇａｔ气体混合物中的Ｓｃｈｌｏｇｌ模型，分析了外控组分和中间组分的双重非理想性对多定态解的影响．在中间组分的非理想性的干预下，由外控组分的非理想性造成的孪生分支现象趋于消失，而孤立圈仍然存在．在该情况下孤立圈退化类型具有新的特征：孤立圈仍然可以退变为椭圆奇点和双曲奇点；但随着孪生分支现象的消失，孤立圈已不再一定收缩为尖点，在特定条件下可演变为正规点．     

格林公式在有有限多个孤立奇点区域上的运用（Ⅱ）

研究Ｇｒｅｅｎ公式与Ｇａｕｓｓ公式在孤立奇点上的应用，并证明在一定条件下，两个公式可互相沟通．这一结果，对于简化线积分、面积分的计算具有使用价值．     

基于M-C准则下非线性材料弹塑性矩阵的推导

由于利用应力不变量以统一形式表达四个屈服准则本构关系的方法应用于摩尔—库仑准则时，在计算中会有奇点出现．针对非线性材料的弹塑性变形特征和其屈服面的非正则性的特点．采用增量理论和等向强化模型，直接导出了平面应力状态下的应力应变间本构关系的弹塑性矩阵。不仅避开原方法中的奇点问题，提高了计算精度，而且概念清晰，便于运用．     

不可约合作系统的极限集

证明了在省去有界正向不变开集G时，系统x＝f(x)的正半轨除了一个Ledesgue测度为零的集外，其余正半轨都走向奇点或无穷；在Ω(Pi)为非空非紧致的条件下，Hirsch所得到的结论“若p1≤p2，且系统x=f(x)过pi的轨道的ω极限集Ω(pi)紧致，则Ω(p1)=Ω(P2)包含E(奇点集)或Ω(p1)＜Ω(p2)，即Ω(p2)与Ω(p2)强相关”仍然成立．     

多项式广义Lienard方程的细奇点与可积性

本文在作者原有工作的基础上，讨论多项式文广义Ｌｉｅｎａｒｄ系统。首先，研究该系统在原点领域存在正则积分的充分必要条件，接着给出原点能作为该系统的精细度为Ｋ阶的临界型细奇点的条件，对于系统存在多个奇点的情形，估计了全体临界型细奇点业精细度之和的上界，并研究了全部初等奇点的整体性质。     

R^3中具有非双曲奇点的异宿系统的混沌性态

本文考虑具有一个双曲奇点，一个非双曲奇点以及连结两奇点的异宿环的三维系统，通过在异宿环邻近构造Ｐｏｉｎｃａｒｅ的映射，并验证Ｍｏｓｅｒ条件，证明该系统在一定条件下存在复杂的混沌性态。     

一类三次系统的奇点判定量

对含雅普诺夫型奇点的实平面三次微分系流给出了奇点结构的９个判定量公式，从而解决了这类奇点邻域相轨线拓扑结构的判定问题．     

量子Monte Carlo固定节面法对分子的研究：—一种新的试探函数

用量子Ｍｏｎｔｅ Ｃａｒｌｏ固定节面法计算了ＣＨ４和Ｈ２Ｏ分子的基态能，获得了９２．４％和７３．８％的相关能，计算中使用了一种新的试探函数，它满足电子与电子，电子与核的奇点条件。     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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