非平行平板电容器电容的一种近似解

对于非平行平板的电容器，构造一个势函数，求电场和能量，经过对能量求极小值得到能量的近似解，进而得到电容的近似解．     

用双能量法计算椭圆柱形电容器和偏心电缆的电容

应用能量分析法来计算两导体间的电容．双能量法是把整个电磁装置看作一个系统，从 系统处于平衡时的能量有极大值或极小值出发．从而获得系统简单近似的能量分布．这种近似提 供了计算电容准确值的上界和下界值．     

偏心球形电容器电容的理论分析与应用探讨

在对偏心球形电容器的电容进行理论计算时，现有的文献大都采用在球坐标系下分离拉普拉斯方程并且假定其偏心率较小采用一阶近似得到了偏心球形电容器电容的近似解。这些计算的局限是它们只能用于小偏心率的情况，当偏心率增加时，就会带来极大的误差甚至是错误。为此本文通过在双球坐标系下分离拉普拉斯方程的方法经推导严格求解了偏心球形电容器的电容，得到了它的级数解，并通过编制程序对级数解进行计算获得了偏心球形电容器的电容大小与偏心率之间的数值关系，发现偏心球形电容器电容大小是随偏心率的增加而增加的，但是在偏心率很小的情况下电容的改变量相当小。可近似认为不发生变化，最后对这种电容器应用的前景进行了探讨。     

电场中带电谐振子在坐标表象和能量表象中的解

运用不同的方法讨论了电场中带电谐振子在坐标表象和能量表象中能量本征值和本征函数的求解方法．认为电场中带电谐振子用定态微扰的方法不仅可以求近似解，也可找到其精确解。     

含修正Yukawa-Kratzar势场的Schr?dinger方程束缚态解析解

采用Greene-Aldrich指数型近似方法近似表达径向方程非线性离心项,利用P-NU方法研究了含修正Yukawa-Kratzar势场的Schr?dinger方程束缚态解析解问题,得到了归一化的束缚态波函数和相应能量本征值方程,数值求解能量本征值方程并和真实值数据进行了对比。     

三维转动神经网络的研究：（1）能量函数

简述了三维转动神经网络模型，通过对能量函数的研究，证明了网络当神经元个数远大于存贮图象数时，存贮图象为能量空间中的极小值．引入了绝热近似，有效局域场能正确迭代的几率，等于方向角和旋转角分别能正确选代的几率的乘积．     

远端均匀拉力下正交各向介质中平面椭圆夹杂受非弹性特征应变作用引起的弹性场

求解了正交各向异性介质中平面椭圆夹杂在远端作用与椭圆主轴呈任意角度均匀拉力情况下受非弹性特征应变引起的弹性场．采用各向异性平面问题的复变函数解法，结合保角变换，获得夹杂内应变能和基体应变能的显式表达式．进一步，根据最小应变能原理，获得了表征夹杂，基体平衡边界的4个待定参数，从而得到了弹性应力和应变场的封闭形式的解析解．通过应力变换关系，验证了基体内边界上法向正应力和剪应力均满足连续性条件，表明了该解的正确性．     

直流电力拖动系统中能量损耗的研究

在分析了极小值原理和直流电力拖动系统的基础上,建立了与能量损耗有关的数学模型,利用极小值原理解出了电枢电流为控制量的最优解,并对最小能量损耗控制的可行性进行了分析。     

改进加权残值法收敛性的一种方法──逐次逼近法

本文对加权残值法的实际应用情况进行了探讨，针对其收敛性问题提出了一种改进方法──逐次逼近法．首先利用近似解的误差分布建立误差函数，然后用最小二乘法求整体误差的极小值，问题归结为求解一个线性方程组．薄板弯曲问题算例结果表明，本方法具有计算简单、收敛速度快，能进一步逼近精确解等优点     

用双能量法计算水电站中单相水电阻器的电阻

用双能量法计算水电站中单相水电阻器的电阻把整个装置看作一个系统研究其能量从系统处于平衡时的能量有极大值和极小值出发,获得系统中简单近似的能量分布这种近似的分布提供了计算水电阻准确值的上界值和下界值计算方法简单,精确度高     

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