一类拟线性椭圆型方程基态解的存在性

讨论了一类拟线性椭圆型方程-△_pu=f(x,u)在R~N中,其中f(x,u)是局部H(o)lder连续函数.通过对f(x,u)建立适当的条件讨论了方程基态解的存在性,并且非线性项f(x,u)当u→0~+时可能出现奇异.     

一类双调和方程基态解的存在性

研究以下双调和非线性椭圆方程:{Δ2 u+V(x)u=f(x,u)于RN,u∈H2(RN).其中V(x)是具有正下界的连续周期函数,非线性项f(x,u)∈C1,F(x,u)∶=∫u0f(x,s)ds具有超线性增长(但不一定满足AR条件),主要用极小化方法证明上述方程的基态解的存在性.该结果是文献[3]中半线性椭圆方程的结果在双调和型方程中的推广.     

渐近线性薛定谔-泊松方程的非平凡解

研究以下带有渐近线性薛定谔-泊松方程-Δu+V(x)u+φ(u)=f(u),x∈R3,-Δφ=u2,x∈R3.{(SP)该方程也被称为薛定谔-麦克斯韦方程的非平凡解的存在性,其中卡氏函数f(u)∈C(R,R)为超线性的.     

带有不定线性部分的薛定谔方程的多解存在性

本文研究如下薛定谔方程:-Δu=V(|x|)u+f(|x|,u),x∈RN,u∈H1(RN).在V和f满足一定的假设下,我们得到了该方程的无穷多个径向解的存在性.     

山路引理在一类渐近线性椭圆方程中的应用

研究了形如-△u=λa(x)u f(x,u)的Dirichlet问题的解的存在性,其中x∈Ω,u∈H10(Ω),a(x)为非负且绝对可积函数,f(x,t)∈C((Ω)×R),f(x,t)/t关于t单调不减,且f(x,t)关于t在无穷远处是渐近线性的.在没有(AR:Ambrosetti A, Rabinowitz P H.J Funct Anal,1973,14:139-381.)条件的情况下定义了一个约束变分问题,通过一种改进了的山路引理,证明了这类方程的正解存在性问题.     

一类带渐近线性项的Schrdinger方程非平凡解的存在性

研究了如下Schrdinger方程:-Δu+V(x)u+u=f(u),x∈RN,其中N≥3,f(u)关于u在无穷远处渐近线性.这类方程源于数学物理中的多种分支,在生物学的一些问题中也有一定的体现.利用山路定理,证明了在一定条件下该方程在H1(RN)中非平凡解的存在性.     

具有一般非线性项的Cahn-Hilliard方程的整体吸引子

改变了Cahn Hilliard方程 : u t-△k(u) =0 ,　k(u) =-λ△u f(u) , u n =- △u n =0 ,u(x ,0 ) =u0 (x)的非线性项f(u) ,用较一般限制条件代替了“f(u)是首项系数为正的奇数多项式”这一条件 ,并证明了该方程存在紧连通整体吸引子 .     

一非线性抛物型方程波前解的存在性

考虑如下抛物型方程 u t+h(u) u x=f(u) + 2 u x2 其中hC[0,1]∩C1(0,1],f(u)C1[0,1],f(0 )=f(1)=0,且f′(1)<0.讨论了f(u) >0,u(0,1)及f(u)在(0,1)内有唯一零点情形下,波前解存在的充分条件.     

一类带Hardy临界指数的半线性椭圆方程的多重解问题

应用集中紧性引理及对称山路定理讨论一类半线性椭圆方程:-Δpu=α|u|p-2u|x|-p+f(x,u),u∈W10,p(Ω).当f(x,u)满足一定条件时,方程存在无穷多解.     

不满足A－R条件的双调和方程无穷多解的存在性

在有界光滑区域 Ω?RN(N>4)上, 研究了双调和方程Δ2u－λu＝f(x,u),x∈Ω;u＝?u/?n＝0,x∈?Ω,其中,f(x,u)是关于u的奇函数,u趋于无穷时是次临界的,并且不满足A－R条件.利用对称的山路引理,证明上面的方程有无穷多解且相应的临界值序列趋于正无穷大.     

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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