二阶非自治Hamilton系统的偶同宿轨道

针对非自治Hamilton系统同宿轨道的存在性问题,以一类具有对称位势的二阶非自治Hamilton系统为例,在位势函数具有新的超二次条件下,利用变分学中的山路引理证明其至少存在一偶同宿轨道.     

以超对称量子力学求解薛定鄂方程的几例

超对称量子力学求解薛定方程的关键是求解黎卡微分方程，由黎卡提方程求解的讨论,系统地得出了方程的数种可解情况，各可解情况对应着不同的超对称势函数，讨论了此数种超对称势函数对应的不同种类的一维势能函数。     

一类超二次六阶半线性周期微分方程同宿轨道存在性

本文利用Brezis-Nirenberg型的山路引理,研究了一类六阶周期半线性微分方程u^（iv）＋Au^（iv）＋Bu″-u＋Vu（x,u）=0同宿轨道的存在性,其中V（x,u）为非负的超二次位势函数.     

构造具有超混沌特性的二维离散系统

用自动生成的方式构造出一类具有超混沌特性的二维离散系统，其非线性函数由幂次不高于2的多项式组成，通过计算李氏指数来判断所选的系统是否为超混沌的。不仅得到一般形式的超混沌系统，而且还在特殊限定条件下得到了一些形式简单的超混沌系统。此外，对其中两个系统的分岔特点进行了理论分析。     

（HgS／CdS）nHgS线状超品格电子能带结构

建立了由两种不同材料构成的沿轴向的线状超晶格体系的薛定谔方程，并对(HgS／CdS)nHgS线状超晶格作具体计算，探讨了势阱和势垒宽度对电子能谱的影响。结果表明：沿轴向方向的线状超晶格系统的电子能谱存在能带结构，低能带的宽度要比高能带的宽度小；势阱宽度增大和势垒宽度减小会使带底的位置降低而带宽增大；圆柱半径在40^。A左右时，第一禁带宽度最大。     

对称自然Hamilton系统的极小周期解

利用临界点理论，对一类对称自然Ｈａｍｉｌｔｏｎ系统在位势函数为一阶可微等条件下，给出极小周期存在的结果。     

参数不确定超混沌系统的混合同步研究

针对一类参数不确定超混沌系统的混合同步问题,提出了一种设计控制律的方法.通过自适应控制法设计合适的控制器和参数自适应律,实现含未知参数的超混沌系统的混合同步控制,并利用不变集原理证明了混合同步误差系统是渐近稳定的.通过对超混沌Lü系统的数值仿真,验证了所提出方法的有效性.     

非平衡系统的势函数

用热力学极限下master方程的定态解定义了非平衡系统的势函数,证明在平衡态时,这个势函数归为熵,在线性非平衡区它等效于超熵.在远离平衡态当熵和超熵失去了作为热力学势的性质后,新定义的非平衡势仍然保持它在近平衡时的全部作为势的特征.     

四维混沌(超混沌)系统投影同步的稳定性判据

给出了一类相互耦合的部分线性四维混沌（超混沌）系统发生投影同步的简单判据，指出了具备该性质的耦合混沌系统可能的应用前景。     

超对称量子力学和具有严格Isospectral性质的势函数家族

本文用另一种方法,讨论了一个有几个束缚态的势函数V(x),在超对称变换下如何构造成具有n个参数的势函数家族,其成员有严格的Isospectral性质,即有完全相同的本征值谱,完全相同的反射和透射振幅。我们同时也指出了这势函数家族与KdV方程和另一些非线性方程的Soliton解之间的联系。     

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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