Banach空间中二阶非线性脉冲积分—微分方程的初值问题

讨论脉冲为非线性形式的二阶脉冲积分－微分方程的初值问题。利用单调迭代技巧、锥理论和上下解方法,得到了最小解与最大解的存在性及迭代逼近定理。它推广了脉冲为线性形式的相应结果。     

次线性脉冲积分方程的正解及应用

利用上下解方法给出了次线性脉冲积分方程的正解的存在性，并应用到脉冲微分方程的Ｓｔｕｒｍ－Ｌｉｏｖｕｉｌｌｅ边值问题上去。     

二阶脉冲积分微分方程边值问题解的存在性

考虑了一类二阶脉冲积分微分方程的边值问题,建立了比较定理,利用上下解和单调迭代的方法讨论了脉冲积分微分方程边值问题解的存在性.     

一阶脉冲时滞微分方程的周期边值问题

利用上下解方法及单调迭代技巧,讨论了一类一阶脉冲时滞微分方程的周期边值问题,获得了其极大解与极小解的存在性,这样可将方程的解控制在极小解与极大解之间.     

带"上确界"的一阶脉冲微分方程的周期边值问题

利用上下解方法和单调迭代技术，研究了带“上确界”的一阶脉冲微分方程的周期边值问题，并且获得了其极值解存在性结果．     

一类脉冲微分方程的周期边值问题

研究了一类一阶脉冲泛函微分方程边值问题的极值解的存在性.通过利用V.Lakshmikantham上下解方法并结合单调迭代技术得到了边值问题的最大解和最小解的一组充分条件.     

具有非线性边值条件的二阶脉冲积微分方程的解

脉冲微分方程在理论方面已取得重大进展,应用极其广泛。文中介绍了上下解的定义、单调迭代方法并给出几个引理。最后用上下解方法和单调迭代技巧讨论了具有非线性边值条件的二阶脉冲积微分方程,得到了最大解和最小解的存在性。     

一阶脉冲微分方程积分边值问题的上下解方法

讨论了一类带积分边界条件的一阶脉冲微分方程极值解的存在性问题.在经典假设 α≤β下(α,β为对应方程的上下解),利用上下解方法组合单调迭代技术得到了极值解存在的充分条件.     

一类时滞四种群食物链生态模型的渐近性态

利用解的整体存在性定理、上下解方法和相应的单调迭代序列，研究了一类在有界区域上具有牛曼边界条件的时滞四种群食物链反应扩散模型，给出了简单和易验证的解的存在-}生和平衡态方程正解的全局渐近稳定性的充分条件。这个结果隐含着食物链系统的共存是持久的，平凡解和所有半平凡解是不稳定的。     

含参数分数阶微分方程边值问题的极值解

该文研究了一类含参数λ并且阶数大于1(1〈〈2)的分数阶脉冲泛函微分方程，利用分数阶微积分理论，将它转化为一阶常微分方程边值问题，再利用单调迭代技术和上下解方法来研究这类方程的极值解的存在性.     

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