二阶拟线性微分方程的振动准则

对二阶拟线性微分方程[r（t）｜x’（t）｜^α-1x’（t）]’＋p（t）｜x’（t）｜α-1x’（t）＋g（t）｜x（t）｜^β-1x（t）=0,利用积分平均法和黎卡提变换技巧,得到了一些新的振动准则,改进和推广了Kamenev、Philos、Wang、Xu的结果．     

一类二阶非线性微分方程的振动性判据

利用积分平均技巧和Hardy，Littlewood＆Polya不等式建立了一类二阶非线性微分方程[r（t）｜x′（t）｜^α-1x′（t）]′＋q（t）（｜x｜^α-1x＋β｜x｜）=0的振动性判据，其中0≤β〈1为常数．所得结果将已有的部分结果推广到更加广泛的方程上，并完善了Manojlovic（1999）的证明过程．     

二阶非线性中立型微分方程的振动准则

文章主要研究了如下方程的振动性（r（t）｜（x（t）＋p（t）x（τ（t）））′｜α-1（x（t）＋p（t）x（τ（t）））′）′＋q0（t）｜x（τ0（t））｜α-1x（τ0（t））＋∑ni=1qi（t）｜x（τi（t））｜βi-1x（τi（t））=e（t）,t≥T.其结果推广和改进了已有结论.     

一类二阶非线性中立型时滞微分方程的区间振动性判据

通过运用不等式和积分平均技巧，给出了一类形如 [r（t）｜（x（t）＋p（t）x（t-τ））′｜^α-1（x（t）＋p（t）x（t-τ））′]′＋q（t）f（x[σ（t）]）=0的二阶半线性中立型时滞微分方程的区间振动性判据，改进推广了一些已知的判据.     

二阶半线性脉冲微分方程的振动性

考虑具有线性脉冲扰动y（τk^＋）=bky（τk）,y＇（τk^＋）=dky＇（τ^-,k）的二阶半线性脉冲微分方程（r（t）φ（y＇（t）））＇＋p（t）φ（y（t））=0,其中{bk}与{bk}为正实数列，γ,p∈C（[t0,∞）,（0,∞））,φ（u）=｜u｜^α-1u,α〉1.证明了方程所有解的导数振动的充分条件为∫t0^∞p（s）∏t0〈τk〈sdk^-αbk^αds=∞,∫t0^∞r^-1/α（s）∏t0〈τk〈sdkbk^-1ds=∞     

三维空间中耦合非线性Schroedinger方程组的整体解

证明了三维空间中一类耦合非线性Schroedinger方程组的Cauchy问题 iut＋Δu=a｜u｜^a-1u｜v｜^β＋1，ivt＋Δv=b｜u｜^a＋1｜v｜^β-1v,u（0,x）=u0（x）,v（0,x）=v0（x）,t＞0，x∈R^n，整体解的存在唯一性，并得到了解关于初值的连续依赖性及解具有的较强的衰减估计     

一类多指标随机过程样本轨道的性质

设{X（t,ω）：t∈R^N}是R^d值轨道连续的随机过程,存在常数0＜α＜1,M＞0,β≥d使E｜X（t）-X（s）｜^β≤M｜t-s｜^αβ t,s∈R^N,（β＞N/α或E sup h∈[0,T]^N ｜X（t＋h）-X（t）｜^β≤MT^αβ t∈R^N,0＜T≤1得到了X关于Borel集的象集和图集以及水平集的Hausdorff维数的最佳上界;同时存在常数a,α,b＞0使P（｜X（t）-X（s）｜≤｜t-s｜^α x）≤ax^d t,s∈R^N,x≥0得到了X关于Borel集的象集和图集的Hausdorff维数的最佳下界。     

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．     

一类高阶拟线性方程的非振动准则

考虑高阶差分方程△^2（＋△^2yn｜^（α-1）△^2yn）＋qn｜yr（n）｜^（β-1）yr（n）=0。α,β是正常数,{qn}n0^∞二是正实数列,n0∈N0{1,2,…}。lim↑a→∞t（n）=∞,T（n）≤n,获得非振动解存在的充要条件。     

带阻尼项的二阶拟线性非齐次微分方程的振动性判据

主要研究了带强迫项的二阶拟线性微分方程（r（t）｜y（′t）｜α-1y（′t））′＋p（t）｜y（′t）｜α-1y（′t）＋q（t）｜y（t）｜β-1y（t）=e（t）,t≥t0,的振动性问题,给出新的判据,推广和改进了已有的结果.     

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.     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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