关于一类拟线性抛物方程解的爆破行为

讨论了拟线性抛物型方程具有第三非线性边界条件的混合问题的解的爆破行为,得到几种拟线性抛物方程解的爆破条件.     

拟线性抛物型不等方程整体解的不存在性

利用先验估计和一些经典不等式证明了一类拟线性抛物型不等方程整体解的不存在性 ,并给出了一类具较强拟线性的抛物型不等式方程整体解的比较原理 ,得到的结果不需要假设初值条件     

非一致拟线性抛物型方程广义解的极值原理

本文讨论非一致拟线性抛物型方程和一类方程组的广义解的极值原理,结果由定理2和定理3给出,它们是椭园型和一致抛物型方程相应结果的推广。     

解拟线性抛物型初边值问题差分方程的数值延拓法

拟线性抛物型偏微分方程初边值问题的差分方程一般是一个非线性方程组.本文根据非线性方程组解存在与唯一性的理论,采用数值延拓法,建立了一类拟线性抛物型偏微分方程边值问题的差分方程数值解的迭代算法,给出该算法全局收敛的充分条件,并且用具体的算例说明所给算法的可行性.     

一类带非线性源的拟线性抛物方程解的熄灭问题

 研究了一类拟线性抛物方程边值问题解的熄灭问题,非线性抛物方程在随时间增加时,不一定存在连续的解,有的问题解是整体存在的,有的问题解就不存在,熄灭是解不存在的一种。形如ut-div[?滓(|?荦u|2)?荦u]=?姿u p的拟线性抛物方程在RN中有界凸空间上的解的熄灭问题,是几何学领域率先提出的,此时方程的主部项不再是一致椭圆的,这是与p-Laplace型方程的主要区别也是难点所在,利用上下解方法及积分估计方法得到两类在有限时间内解熄灭的结果。研究中所利用方法是一种常用方法,可以推广到更一般的拟线性抛物方程的研究。     

拟线性抛物型方程边值问题差分方程解的存在与惟一

数值求解拟线性抛物型偏微分方程边值问题通常可归结为解非线性方程组,非线性方程组解的存在与惟一性是解方程组的前提．为此,用差分方法建立了数值求解一类拟线性抛物型方程边值问题的非线性方程,根据同胚理论得到了该方程组解存在与惟一的结果,并通过具体例子给予了说明．     

抛物型方程广义解最大值原理的一个证明

本文给出拟线性抛物型方程(1)的广义解最大值原理的一个证明。     

抛物型方程广义解的弱最大值原理

本文考虑了一类拟线性抛物型方程,对广义解证明弱最大值原理成立。     

拟线性抛物方程初值问题周期解的存在性

讨论了一类拟线性抛物型方程初值问题的周期解在已知函数的某些假设条件下,证明了这类问题周期解的存在性     

一类拟线性抛物型方程解的爆破现象

讨论一类拟线性抛物型方程具有非线性边界条件的初边值问题解的爆破性质。在某些假设条件下证明了其解在有限时间内爆破。     

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