球形脉冲在焦点的散射研究(Ι)

讨论了非线性波动方程(2t-Δx)uε+F(εα|tuε|p-1tuε)=0,(t,x)∈[0,T]×R3,uε|t=0=εU0r,r-r0ε,tuε|t=0=U1r,r-r0ε。当p>2,α=p-2时解在穿过焦点(r0,0)后的性态,其中F1在上是一致Lipschitz的。通过变量变换,将问题转化为讨论无穷远处的解,引入一个关键函数讨论脉冲波穿过焦点后(t→+∞)的性态。     

R1+3中球形非线性脉冲波的存在性分析

讨论了非线性脉波动方程Λuε F(|tuε|p-1tuε)=0,(t,x)∈[0,∞]×R3uεt=0　=εJ 1U0(r,r-r0ε),tuεt=0　=εJU1(r,r-r0ε)在1相似文献   

球形脉冲在焦点的散射研究(Ⅰ)

讨论了非线性波动方程{((б)2t-△x)uε+F(εα|p-1(б)tuε)=0,(t,x)∈[0,T]×R3,uε|t=0=εU0(r,r-r0/ε),(б)tuε|t=0=U1(r,r-r0/ε).}当p＞2,α=p-2时解在穿过焦点(r0,0)后的性态,其中F1在上是一致Lipschitz的.通过变量变换,将问题转化为讨论无穷远处的解,引入一个关键函数讨论脉冲波穿过焦点后(t→+∞)的性态.     

球形脉冲波在焦点的散射研究(Ⅱ)

本文讨论了半线性波动方程(2t-Δx)uε+F(εα|tuε|p-1tuε)=0(t,x)∈[0,∞[×R3uε|t=0=εU0(r,r-εr0),tuε|t=0=Ul(r,r-εr0)。当p>2,α=p-2时解在到达焦点(r0,0)前无穷远处的性态,其中F在R上是一致Lipschitz的。通过变量变换,将问题转化为负无穷远处的初、边值问题,证明解的存在唯一性,引入线性解讨论脉冲波在t→-∞的传播性态,并引入散射算子说明了脉冲波越过焦点的过程。     

一维空间中一类波方程的渐近理论

研究了一维空间中一类非线性波方程初值问题utt-uxx+p2u=εf(t,x,u,ε),t＞0,0＜x＜∞;u(0,x,ε)=u0(x,ε),ut(0,x,ε)=u1(x,ε),的渐近理论.在古典意义上研究了在长时间阶|ε|-(1)/(2)时解的适定性及形式近似解的合理性,并对近似解作了描述.     

全空间上带 Hardy-Sobolev 临界指数的拟线性椭圆方程变号解的存在性

讨论了全空间上一类带Hardy-Sobolev临界指数的拟线性椭圆方程{-Δpu-μ|u|p-2 u/|x|p=λ|u|p(t)-2/|x|tu+f(x,u),x∈RNu∈D01,p(RN)其中:D01,p(RN)是C0∞(RN)的闭包,Δpu=-div(|▽u|p-2▽u),20,0≤t相似文献   

方程(e)u/(e)t=│x│pΔu的一类相似解

研究方程(e)u/(e)t=│x│pΔu,(x,t)∈Rn×(0,+∞)的具有形式(t+1)βw((t+1)αx)的相似解的存在惟一性,这里n≥2,0≤p<2,β>0,α=-1/2-p.     

方程δu／δt=｜x｜^p△u的一类相似解

研究方程(e)u/(e)t=│x│pΔu,(x,t)∈Rn×(0,+∞)的具有形式(t+1)βw((t+1)αx)的相似解的存在惟一性,这里n≥2,0≤p<2,β>0,α=-1/2-p.     

关于无穷级亚纯函数的公共包莱尔方向

以下用Δ_α表示z平面上以正买数轴为分角线顶点在原点且角度为απ的角域,其中0<α<1。引理1.函数z=ψ(u)=((1+u)/(1-u))~α为把单位圆|u|<1变成角域Δ的保角变换,且若记D=ψ(|u|相似文献   

在RN上的拟线性椭圆型方程正解的存在性

研究了以下非线性Dirichlet问题在一定条件下的弱正解的存在性-div(|(△)u|p-2(△)u)+a(x)up-1=h(x)uq+up*-1,x∈RN,u≥0,u0,∫RN?a(x)*|u|pdx＜+∞.其中,aRN→R是连续非负函数,hRN→R是某类可积函数,2≤p＜N且p2≤N,0＜q＜(p2(p-1))/(N-p)-1,p*=(Np)/(N-p).从而在更弱的条件下将p=2或次临界指数的情形推广到P-Laplacian及临界指数的情形,同时推广了a(x)=0时的某些结果.     

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