Rosenau-KdV方程的一个非线性守恒加权差分逼近

利用LXA加权差分格式的构造思想,在空间层引入加权系数,对Rosenau-KdV方程的初边值问题进行数值研究,提出了一个三层非线性加权差分格式,合理模拟了该问题的两个守恒性质,得到了差分解的先验估计,并利用离散泛函分析方法分析了格式的二阶收敛性与无条件稳定性.数值实验表明,该方法是可靠的,且适当调整加权系数可以大幅提高计算精度.     

耗散SLRW方程的一个新的守恒差分逼近

利用Lax格式的离散思想,引入加权系数,对耗散对称正则长波方程的初边值问题提出了一个带有加权系数a的3层线性差分格式,格式合理地模拟了问题的2个守恒律,得到了差分解的先验估计,分析了该格式的二阶收敛性与稳定性.数值实验表明,该方法是可信的,且适当调整加权系数,可以大幅提高计算精度.     

Rosenau-KdV方程的一个线性守恒加权差分逼近

利用LXA加权差分格式的构造思想,在空间层引入加权系数,对Rosenau-KdV方程的初边值问题进行了数值研究,提出了一个具有二阶精度的三层线性空间加权差分格式,该格式合理地模拟了原问题的两个守恒性质,给出了差分解的先验估计,分析了差分解的存在唯一性,用离散泛函分析方法证明了该格式的无条件稳定性与收敛性。数值算例表明,该加权方法是可靠的,且适当调整加权系数可以大幅提高计算精度。     

Rosenau-RLW方程的非线性守恒差分格式

对Rosenau-RLW方程的初边值问题研究差分数值计算方法,提出了一个带有加权系数θ的两层非线性差分格式。格式模拟了方程的两个守恒量,并利用差分解的先验估计和能量方法分析了该格式的二阶收敛性与无条件稳定性。数值结果表明,适当调整加权系数θ,可以大幅提高格式的计算精度。     

耗散SRLW方程的一个非线性守恒加权差分算法

我们对具有耗散项的对称正则长波方程的初边值问题进行了数值研究,提出了一个带有加权系数θ的两层Crank-Nicolson差分格式,格式合理地模拟了问题本身的两个守恒量.在差分解的先验估计基础上我们用能量方法分析了该格式的二阶收敛性与无条件稳定性.数值试验表明该方法是可信的,且适当调整加权系数θ可以大幅提高格式的计算精度.     

Rosenau-RLW方程的非线性守恒差分格式

对Rosenau-RLW方程的初边值问题研究差分数值计算方法,提出了一个带有加权系数θ的两层非线性差分格式。格式模拟了方程的两个守恒量,并利用差分解的先验估计和能量方法分析了该格式的二阶收敛性与无条件稳定性。数值结果表明,适当调整加权系数θ,可以大幅提高格式的计算精度。
     

Rosenau-KdV方程的一个线性守恒加权差分逼近

利用LXA加权差分格式的构造思想，在空间层引入加权系数，对Rosenau-KdV方程的初边值问题进行了数值研究，提出了一个具有二阶精度的三层线性空间加权差分格式，该格式合理地模拟了原问题的两个守恒性质，给出了差分解的先验估计，分析了差分解的存在唯一性，用离散泛函分析方法证明了该格式的无条件稳定性与收敛性。数值算例表明，该加权方法是可靠的，且适当调整加权系数可以大幅提高计算精度。
     

Rosenau-RLW 方程的加权守恒差分格式

本文对Rosenau-RLW方程初边值问题的数值解法进行了研究,提出了一个三层的加权差分格式,该格式较好地模拟了方程的守恒性质.然后本文讨论了差分解的存在唯一性,给出了差分解的先验估计和误差估计,并利用能量方法分析了该格式的二阶收敛性、无条件稳定性.数值算例验证了格式的可靠性,并且适当调整加权系数还可以提高计算精度.     

Rosenau-Burgers方程的一个新的差分方法

从动力学系统的实际问题出发,针对Rosenau-Burgers方程的初边值问题进行了数值研究,揭示了复杂离散动态系统理论中非线性波耗散问题. 在方程求解的时间和空间区域,采用网格化方法,提出了一个新的三层隐式差分格式,对差分解进行了先验估计,并给出了该格式的稳定性和收敛性的严格理论证明. 数值实验的结果表明,差分格式简单而有效、计算速度快、稳定性好,并且差分格式使用了加权方法,使其具有普遍意义和推广价值.     

Rosenau-Burgers方程的加权隐式差分方法

作者对Rosenau-Burgers方程的数值解法进行了研究,对该方程的初边值问题提出了一个三层加权隐式差分格式,讨论了差分解的存在唯一性,并分析了格式的收敛性和稳定性.数值实验验证了方法的有效性,且效果较好.     

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