粗积分的动态特征

基于函数S 粗集和F 粗积分,本文研究粗积分的动态特征,定义粗积分链和粗积分环的概念,给出上积分链,下积分链定理,粗积分链定理,以及积分链的存在性定理,讨论了积分链的可闭条件,得到积分环定理,粗积分环定理。另外还对积分链与积分环的一些特征进行讨论,给出中值定理在粗积分链中的应用结果。     

积分对称性的研究及其应用

总结了定积分、重积分、曲线积分和曲面积分的积分对称性,并结合具体例子说明利用积分对称性可简化大量积分计算．     

利用复积分计算实积分

在物理学研究中,需要计算一些特殊实积分,这些积分按实积分计算比较麻烦,有些甚至不可能,但化为复积分,运用柯西积分定理及留数定理来计算简捷方便.给出了用复积分计算物理学中狄利克雷积分、菲涅耳积分、欧拉积分及开普勒积分等几种特殊实积分的方法.     

曲线积分与曲面积分的对称性及其应用

通过曲线积分到定积分的转换,以及曲面积分到二重积分的转换,系统地梳理了各类曲线积分与曲面积分的对称性,给出了各类曲线积分与曲面积分对称性的数学原理,并通过具体实例展示了这些对称性在简化曲线积分与曲面积分计算中的作用。     

试论第三类广义积分的存在性

广义积分是定积分的极限状态;第三类广义积分可以通过变量替换化成第二类广义积分;第一、二类广义积分可以化成常积分;第三类广义积分都可以写成第一类与第二类广义积分的代数和。     

对称视角下两类广义积分敛散性的比较研究

广义积分是定积分的推广,是积分学中非常重要的内容。广义积分的计算是以广义积分的收敛为基础的,而两类广义积分■的敛散性是一般广义积分敛散性判别的基础。文章主要研究广义积分■的敛散性的等价性,基于对称及数形结合思想得出:当■时,无穷限积分■和瑕积分■敛散性等价,即当■时,广义积分■和瑕积分■同时收敛;当■时,广义积分■和瑕积分■同时发散。     

计算含参量反常积分的一些特殊方法

计算含参量的反常积分时,常用的是两种方法：1）利用积分号下求积分的方法计算反常积分;2）利用积分号下求导方法计算反常积分,本文介绍另外几种求反常积分的方法．     

第二型曲线积分计算方法与技巧

第二型曲线积分的计算联系着各种积分,根据积分路径和被积式的特点,将其转化为定积分、重积分或曲面积分计算,既能简化其计算,又有利于积分知识的融会贯通与运用。     

三维弹性体边界元常单元的精确积分计算

边界元方法中的边界积分计算影响计算精度和计算速度.当采用常单元计算时,非奇异积分一般采用数值积分,奇异积分采用精确积分法.文章采用积分区域变换和高斯公式,将三维弹性问题的二维积分化为一维积分,使常单元奇异积分和非奇异积分都能采用精确积分的方法计算.实例计算结果表明,此算法能使边界积分的求解精度和计算速度都得到提高.     

数学积分的几种性质讨论

本文介绍定积分的定义和定积分的几种基本性质,从定义出研究定积分的性质,通过学习认识分析定积分的性质,提及定积分的中值定理。研究定积分的性质方便定积分的学习与应用。     

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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