一类常微分方程的积分解

本文给出以下形式的微分方程的积分解：其中　为实数｜αs｜＞0,｜λ｜＞0,｜λ｜＞0,s＝1,2,3,…,kj,j＝1,2…,n－2k;λ＝　　｛｜αs｜,｜λj｜｝,y（x）为（－∞,＋∞）上的有界函数,则方程Pn（D）f（x）＝y（x）且满足f（x）＝O（e（λ｜x｜））;x｜→∞的解f（x）＝Cn（x－t）y（t）dt,其中Cn（x）＝　当y（x）为以1／h为周期的有界实函数时,上述方程的解为f（x）＝（x－t）y（t）dt,其G（n,h）P（x）＝     

带有临界Sobolev和Hardy项的半线性椭圆方程的解（I）

设Ω包含R^N是有界光滑区域，0 ∈Ω ,N≥3,2^＊：=2N/N-2,0≤s〈2,2^＊（s）：=2（N-s）/N-2,2〈r〈2^＊（s）．对于满足一定条件的参数λ和μ，证明了带Diriehlet边界条件的奇异椭圆问题-△u-μu/｜x｜^2=｜u｜^2＋-2u＋λ｜u｜^r-2/｜x｜^1u的一些重要性质．     

一类二阶非线性微分方程解的平方可积性

在本文中。我们讨论了二阶非齐次微分方程（r（t）x’（t））’＋q（t）x（t）=f（t）和非线性微分方程（r（t）x’（t））’＋p（t）x（t）＋q（t）f（t，x）=0，并建立了其属于L．C（平方可积）的充分条件．     

中立型Voherra积分微分方程概周期解的存在唯一性

研究了中立型Volterra积分微分方程x’（t）=A（t）z（t）＋∫-∞^t C（t,s）g（s,x（s））ds＋∫-∞^t B（t,s）x’（s）ds＋f（t,x（t））的概周期解的存在性及唯一性问题．利用不动点方法,得到了一些关于该方程的概周期解的存在性及唯一性的新结果．     

三阶泛函微分方程非振动解的渐近性

考虑三阶非线性泛函微分方程（r2（t）（r1（t）x′（t））′）′＋p（t）x′（t）＋q（t）F（x（σ（t））,x′（σ（t））,（r2（t）x′（r（t）））′）=0得到了方程的非振动解x（t）满足limt→∞x（t）=0的充分条件．     

强混合删失样本密度函数估计的r阶相合速度

基于删失样本,研究α-混合序列下密度函数f（x）的核估计fn（x）的r（0〈r≤2）阶相合性,并给出其r阶相合速度;证明失效率函数λ（x）的r阶相合速度．     

三阶非线性中立型微分方程非振动解的渐进性

考虑三阶非线性中立型时滞微分方程（r2（t）（r1（t）（x（t）＋p（t）x（τ（t）））′）′）′＋q（t）f（x（t），x（σ（t）））=0利用积分平均法得了方程的有一个有界非振动解x（t）满足lim（t）t→＋∞=0的一个充分条件，所得结果改进并完善了以前的结论．     

一类二阶中立型泛函微分方程的多重周期解

利用变分原理和Zz不变群指标,研究一类二阶中立型泛函微分方程（p（t）（μx＇（t）＋x＇（t-τ）＋μx＇（t-2τ）））’-q（t）x（t-τ）＋λf（t,x（t））,x（t-τ）,x（t-2τ））=0,｜μ｜〈1/2多重周期解的存在性问题,得出了有关新结果．     

二阶非线性微分方程的振动准则

本文主要讨论二阶非线性微分方程（r（t）x’（t））’＋p（t）f（x（t））g（x’（t））=0得到方程的一些新的振动准则．这些结果改进了Wintner，Hartman，Kamenev，Yan和Philos利用通常的黎卡提变换u（t）=a（t）r（t）{x＇（t）/x（t）＋k（t）），其中k∈C^1是[t0，∞）上的连续函数，和a（s）=exp{-2}k（ξ）dξ}所得的振动准则．     

具有脉冲的积分微分系统解的稳定性

主要利用分段连续的李雅普诺夫函数来给出脉冲积分微分系统{dx/dt=Ax(t) ∫0^1C（t,s)x(s)ds,t≠tk Δx=Ik（x），t=tk，k=1，2，…零解稳定性的充要条件。     

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     

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