具脉冲效应的非线性时滞抛物系统的振动分析

利用新的处理非线性扩散项的技巧及脉冲时滞微分不等式, 研究一类具脉冲效应和非线性扩散项的时滞抛物系统在第一类边界条件下的振动性, 得到了该类系统所有解振动的若干新的充分性条件. 结果表明, 系统振动是由脉冲和时滞效应引起的.     

脉冲非线性中立抛物型分布参数系统的振动性分析

考虑一类带中立项的非线性脉冲抛物型分布参数系统的振动性问题,利用处理中立项的技巧和一阶脉冲时滞微分不等式的某些结果,建立了这类系统在Dirichlet边值条件下所有解振动的若干新的充分性判别条件.所得结论充分反映了脉冲扰动和时滞效应在系统振动中的影响作用.     

非线性脉冲中立型时滞抛物偏微分方程的振动性

研究一类非线性脉冲中立型时滞抛物偏微分方程解的振动性, 借助一阶脉冲中立型微分不等式, 获得了该类方程在两类不同边值条件下振动的若干新的充分性判据. 所得结果改进了已有的结果, 且充分反映了脉冲和时滞在振动中的影响作用.     

带变时滞影响的非线性中立型双曲方程的振动性

建立了一类带非线性扩散项和变时滞的中立型双曲方程在Dirichlet边界条件下解振动的一些充分条件.所得结果充分反映了时滞在方程振动中的影响和作用.     

带变时滞影响的非线性中立型双曲方程的振动性（英文）

建立了一类带非线性扩散项和变时滞的中立型双曲方程在Dirichlet边界条件下解振动的一些充分条件.所得结果充分反映了时滞在方程振动中的影响作用.     

一类非线性脉冲时滞分数阶偏微分方程的振动分析

研究了一类带脉冲扰动及时滞效应的非线性分数阶偏微分方程解的振动性问题，利用积分平均方法和一阶脉冲时滞微分不等式的某些结果，建立了该类方程在Neumann边值条件下所有解振动的新的充分性判据，所得结果充分反映了脉冲量和时滞量在方程振动中的决定性作用.     

一类拟线性脉冲时滞双曲系统的（强）振动性

讨论一类具拟线性扩散项的脉冲时滞双曲系统解的（强）振动性质,利用脉冲微分不等式,得到了该类系统在Neumann边值条件下所有解（强）振动的若干充分条件。     

非线性脉冲时滞微分方程的线性化振动

研究了一类非线性脉冲时滞微分方程的振动性．证明了在一定条件下,可以由线性脉冲时滞微分方程的振动性判定非线性脉冲时滞微分方程的振动性．得到了非线性脉冲时滞微分方程与相应的线性脉冲时滞微分方程振动性等价的条件,并给出了它的应用。     

一类拟线性时滞双曲型分布参数系统的(全)振动性

利用新的处理拟线性扩散项的技巧和微分不等式方法,讨论一类带拟线性扩散项的时滞双曲型分布参数系统在齐次Neumann边值条件下的(全)振动性问题.先将这类系统的振动问题转化为二阶时滞微分不等式不存在最终正解的问题,再借助泛函微分方程的某些结果,建立这类系统每个解(全)振动的显式充分条件.所得结果反映了时滞量在决定系统(全)振动中的作用.     

二阶非线性脉冲时滞微分方程的解的振动性

研究了二阶非线性脉冲时滞微分方程的解的振动性,并获得了一些新的结果.     

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.     

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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