测度链上四阶四点边值问题解的存在性

目的 研究一类测度链上四阶四点边值问题解的存在性.方法 利用不动点理论来解决四阶四点边值问题解的存在性.结果 给出一类测度链上四阶四点边值问题解的存在的充分条件.结论 所得结果推广了已有的结论.     

n阶非线性微分方程的三点及四点边值问题

用上下解方法证明两类n阶非线性常微分方程四点边值 问题解的存在性和三类n阶非线性常微分方程三、 四点边值问题解的存在性和惟一性.     

偶数阶微分方程边值问题的上下解方法

针对实际应用中高阶微分方程的求解问题,讨论了一类偶数阶微分方程两点边值问题解的存在性,利用上下解方法,通过将2n阶微分方程转化为二阶积分微分方程,得到其解的存在性定理,同时,在形式上推广了已知的四阶两点边值问题的结果。     

一类分数阶微分方程三点边值问题正解的存在性

为了解决三点边值问题在实际应用中的求解问题,利用上下解方法和Leray-Schauder不动点理论,研究了一类分数阶微分方程三点边值问题正解的存在性,推广了已知边值问题的结果。     

时间测度链上四点边值问题正解的存在性

运用上下解方法研究了时间测度链上一类非线性四阶四点边值问题一个正解的存在性,并给出了与之相对应的线性二阶四点边值问题解的一些性质。     

Banach空间中四阶两点边值问题的上下解方法

采用单调迭代技术，利用上下解方法，在实Banach空间E中研究四阶两点边值问题的解的存在性问题并给出解的存在性定理，同时把这一结果应用于一个具体的无穷四阶微分方程的边值问题，对Ma ru yun的结果作了本质性的改进和推广。     

四阶微分方程两点边值问题的三解

研究四阶微分方程两点边值问题,以B.Ricceri的3个临界点定理为工具,获得了四阶微分方程两点边值问题至少存在三个解的充分条件及推论,并对主要结果进行了证明.     

Liapunov方法在非线性广义系统边值问题中的应用

本文应用Ｌｉａｐｕｎｏｖ方法讨论了非线性广义系统边值问题,通过将两点边值问题的解对结成三点边值问题的解,得到一三阶广义系统三点边值问题解的存在性和唯一性,推广了非线性正常微分系统的结果,。     

一类四阶m-点共振边值问题的非平凡解

利用叠合度理论研究了一类四阶m 点共振边值问题。 首先对其解进行有效的先验估计，然后应用叠合度的定义和拓扑度的性质得到了该类共振边值问题非平凡解的存在性结果。     

一类非线性分数阶微分方程四点边值问题解的存在性和唯一性

研究了一类非线性分数阶微分方程四点边值问题解的存在性和唯一性,利用Schauder不动点定理以及压缩映像原理,得到了边值问题解的存在性以及唯一性的充分条件。     

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     

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