关于一类退化抛物方程的第二临界指数

作者考虑了方程ut=uΔu+uq初值问题的正解,给出了一个新的爆破临界指数.     

具有两个异号非线性源项波动方程解的爆破

作者讨论了具有两个异号非线性源项波动方程μα-△μ+α|u| p-1u-b|u|q-1u＝0的初边值问题解的爆破性质.依据势井理论,通过构造不稳定集,作者结合凸性分析方法证明了初值属于不稳定集,初始能量为正但有适当上界时解将发生爆破.     

一类具有非线性记忆的半线性抛物方程解的爆破速率

作者研究了如下的具有齐次Dirichlet边界的半线性抛物方程：ut-Δu=∫t0m(t-τ)f(u(x,τ))dτ+u(x,t),x∈Ω,t＞0,并得到其解在有限时间爆破的条件以及爆破速率的估计.     

一类非线性波动方程组的爆破性质

作者研究了如下一类具初边值问题的相互作用波动方程组:utt -Δ(u+v)=f(u,v), t＞0,x∈Ω,vtt -Δ(u+v)=g(u,v), t＞0,x∈Ω,讨论了该方程组初边值问题解的爆破性质.     

一类具有非线性记忆和吸收项的半线性抛物方程解的爆破

作者考虑了具有齐次Dirichlet边界和吸收项的半线性抛物方程ut=Δu+uq∫t0upds-kum在(x,t)∈Ω×(t＞0)内正解的爆破性质,并运用上下解的方法得到方程解在有限时间爆破和全局存在的条件.     

相互作用波动方程组整体解的爆破性

利用能量守恒定律和积分不等式技巧,讨论了相互作用波动方程组utt-Δ(u+v)=f(u,v),　vtt-Δ(u+v)=g(u,v),　t>0,x∈Ω整体解的爆破性,得到了关于系统爆破性的一些性质,并给出了blow up时间的一个界.     

二阶拟线性抛物型方程极大值原理的一个简单应用

应用拟线性抛物型方程βt(u)=Δu+f(x,t,u)解的泛函V(x,t)=g(u)ut+h(u)在第一边值问题中极大值原理来研究解的爆破的问题.     

带斯塔克势的非线性Schrdinger方程的爆破速率

研究带斯塔克势的非线性Schrdinger方程iut=-12△u+V(x)u-k|u|4nu,t≥0,x∈Rn,u(0,x)=φ(x)爆破解的爆破速率,得到爆破速率的上、下界估计.     

带斯塔克势的非线性Schr(o)dinger方程的爆破速率

研究带斯塔克势的非线性Schr(o)dinger方程 iut=-1/2△u+V(x)u-k| u|4/nu,t≥0,x∈ Rn,u(0,x)=ψ(x)爆破解的爆破速率,得到爆破速率的上、下界估计.     

一类具有非局部源的退化抛物方程组解的整体存在和有限爆破

讨论了一类具有非局部源的退化抛物方程组:u1=vp2(△u+bum2∫Ωvq2 dx),vt=up2(△v+bvm2∫Ωuq2 dx)在Diriclet边界条件下解的爆破现象.通过运用比较原理和上、下解方法,建立了该方程组解的整体存在和有限爆破的充分条件.     

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     

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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