带斯塔克势的非线性Schroedinger方程L^2集中性质

讨论了带斯塔克势的非线性Schroedinger方程爆破解的定性性质，运用一个变量替换建立了带斯塔克势的非线性Schroedinger方程与不带势的经典非线性Schroedinger方程之间的联系．结合经典非线性Schroedinger方程的性质，进一步研究了临界的带斯塔克势的非线性Schroedinger方程爆破解的结构，证明了其爆破解具有L^2集中性质．特别地，当初始值条件径向对称时，证明了原点O为集中点．     

一个非等谱非线性Schroedinger方程的解及其无穷守恒律

该文用Hirota方法求出一个非等谱非线性Schroedinger方程的类孤子解，并给出其无穷守恒律；通过变换得到相应非等谱散焦非线性Schroedinger方程的解．     

修正的非稳非线性Schroedinger方程的显式精确解

首先利用一个标准变换将修正的非稳非线性Schroedinger方程化成一个非线性偏微分方程组，接着通过选取不同参数得到一些非线性代数方程和非线性常微分方程。然后通过直接方法和假设方法的结合求得约化得到的非线性常微分方程的精确解，从而得到修正的非稳非线性Schroedinger方程的显式精确解，包括精确平面波解、钟状弧立波解、扭状弧立波解、奇异行波解和三角函数状用周期波解。     

基于非线性Schroedinger方程的光纤通信系统仿真

光波在光纤中的传输遵循非线性Schroedinger方程,由于它是一个非线性微分方程,通常情况下无法求出它的解析解。本文通过对称式分布傅立叶法对非线性Schroedinger方程进行了数值求解,并基于这一结果在Matlab环境下建立了10Gb/s单模光纤通信系统的仿真模型。基于仿真模型,模拟了光脉冲在系统中的传输情况,并对RZ和NRZ调制方式进行了比较。     

非线性Schr(o)dinger方程的约化摄动分析

利用约化摄动分析方法获得了非线性Schroedinger方程的包络孤立波解．     

高阶耦合非线性Schroedinger方程的单孤子解

给出耦合非线性Schroedinger方程的Lax对，利用Darboux变换方法，通过具体构造Darboux变换，给出这个孤子方程的单孤子解。     

构造立方非线性Schroedinger方程孤波解的两种新方法

采用两种试探法给出了立方非线性Schroedinger方程的孤波解，这两种方法适用一类非线性方程的孤波求解。     

求解高阶Schroedinger方程的Jacobi椭圆函数展开法

借助计算机代数系统，引入Jacobian椭圆函数负幂次展开方法，求解高阶非线性Schroedinger方程，得到该方程的系列精确解．     

带位势的非线性的Schroedinger方程的Cauchy问题的可解性

研究带位势V（x）∈L^2（R^a）的非线性Schroedinger方程的Cauchy问题的解的存在性，利用Kato—Rellich定理证明Schroedinger算子H=A—V在H^2（R^n）中的自伴性从而由Stone定理得知H=A—V在H^2（R^n）中生成酉群，据此研究了含比F（u）=｜u｜^2σu更一般的非线性项时方程的解的存在性。     

具调和振子的非线性Schroedinger方程的Cauchy问题

考虑具调和振子的非线性 Schroedinger方程的Cauchy问题。采用Galerkin方法证明了整体强解的存在性,利用能量估计方法证明了整体强解的惟一性。     

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     

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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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has