基于按指数律拓展的分数阶积分的El-Nabulsi-Pfaff变分问题的Noether对称性

基于El-Nabulsi动力学模型,提出并研究了Birkhoff系统基于按指数律拓展的分数阶积分的变分问题的Noether对称性与守恒量。基于按指数律拓展的分数阶积分的El-Nabulsi-Pfaff-Birkhoff变分问题,建立起与之对应的El-Nabulsi-Birkhoff方程;基于El-Nabulsi-Pfaff作用量在无限小变换下的不变性,给出系统的Noether对称变换和Noether准对称变换的定义和判据。该研究建立Birkhoff系统基于按指数律拓展的分数阶积分的变分问题的Noether定理,揭示了该模型下系统的Noether对称性和守恒量之间的关系。文末举例说明结果的应用。     

基于按正弦周期律拓展的分数阶积分的变分问题的Noether定理*

基于按正弦周期律拓展的分数阶积分的类分数阶动力学建模方法,研究完整系统的类分数阶Noether对称性和守恒量。首先,基于按正弦周期律拓展的分数阶积分,建立了类分数阶变分问题,导出了类分数阶dAlembert-Lagrange原理,给出了类分数阶Euler-Lagrange方程;其次,基于类分数阶Hamilton作用量在无限小群变换下的不变性,提出了类分数阶Noether对称变换和Noether准对称变换的定义和判据;最后,建立了类分数阶Noether定理,揭示了系统的Noether对称性与守恒量之间的关系,并举例说明结果的应用。     

事件空间中一类拟分数阶Birkhoff系统的Noether定理

基于按指数律拓展的分数阶积分,研究事件空间中拟分数阶Birkhoff系统的Noether对称性与守恒量.首先,基于按指数律拓展的分数阶积分定义,给出事件空间中拟分数阶Pfaff作用量,建立事件空间中拟分数阶Pfaff–Birkhoff原理,并导出Pfaff–Birkhoff–d’Alembert原理,得到事件空间中拟分数阶Birkhoff系统的运动微分方程.其次,计算Pfaff作用量的全变分,给出事件空间中拟分数阶Pfaff作用量的两个变分公式.建立事件空间中拟分数阶Birkhoff系统的Noether对称性的定义和判据.最后,建立事件空间中拟分数阶Birkhoff系统的Noether定理,揭示了系统的Noether对称性与守恒量之间的内在联系.如果分数阶时间积分参数γ=1,则该定理退化为经典的事件空间中Birkhoff系统的Noether定理.文末举例说明结果的应用.     

基于El-Nabulsi模型的分数阶Lagrange系统的Lie对称性与守恒量

研究基于El-Nabulsi模型的分数阶Lagrange系统的Lie对称性与守恒量。基于按Riemann-Liouville积分拓展的类分数阶变分问题导出El-Nabulsi模型的D'Alembert-Lagrange原理,得到系统的运动微分方程;给出分数阶Lie对称性的定义和判据,建立了Lie对称性确定方程,并提出广义Hojman定理,给出广义Hojman守恒量存在的条件及其形式;最后,建立了广义Noether定理,给出分数阶Lie对称性导致Noether守恒量的条件及其形式,并给出两个算例以说明结果的应用。     

基于Riesz导数的分数阶Birkhoff系统的Noether对称性与守恒量

提出并研究Riesz分数阶导数下分数阶Birkhoff系统的Noether对称性与守恒量。分别在Riesz-Riemann-Liouville分数阶导数和Riesz-Caputo分数阶导数下, 建立分数阶Pfaff变分问题, 给出分数阶Birkhoff方程。基于分数阶Pfaff作用量在无限小变换下的不变性, 建立分数阶Birkhoff系统的Noether定理。定理的证明分成两步: 一是在时间不变的无限小变换下给出证明; 二是利用时间重新参数化技术得到一般情况下的分数阶Noether定理。最后举例说明结果的应用。     

基于El-Nabulsi动力学模型的Birkhoff力学

El-Nabulsi在研究非保守系统的动力学建模时,提出了三种类分数阶变分方法,即:基于Riemann-Liouville分数阶积分的变分问题,基于按指数律拓展的分数阶积分的变分问题和基于按周期函数律拓展的分数阶积分的变分问题。将上述三种El-Nabulsi动力学模型拓展到Birkhoff系统,建立了El-Nabulsi-Pfaff变分问题,导出了ElNabulsi-Pfaff-Birkhoff-d’Alembert原理和El-Nabulsi-Birkhoff方程。文末,举例说明结果的应用。     

基于Caputo导数的分数阶广义Birkhoff系统的Noether定理

研究基于Caputo导数的分数阶广义Birkhoff系统的Noether定理.首先,建立分数阶广义Pfaff-Birkhoff原理,导出分数阶广义Birkhoff方程.其次,研究时间不变的特殊无限小变换下的分数阶Noether对称性与分数阶守恒量,建立分数阶广义Birkhoff系统的Noether定理.再次,研究时间变化的一般无限小变换下的分数阶Noether对称性与分数阶守恒量,建立分数阶广义Birkhoff系统的Noether定理,并利用时间重参数方法给出其证明.最后,给出了一个算例以说明其应用.     

基于El-Nabulsi分数阶模型的广义Birkhoff系统Noether对称性研究

为了进一步揭示力学系统的对称性与守恒量之间的内在关系,基于El-Nabulsi分数阶模型提出并研究了广义Birkhoff系统的Noether定理。首先,提出分数阶广义El-Nabulsi-PfaffBirkhoff原理,建立广义El-Nabulsi-Birkhoff方程。其次,基于El-Nabulsi-Pfaff作用量在无限小变换下的不变性,给出广义Birkhoff系统Noether对称性的定义和判据。最后,提出广义Birkhoff系统的Noether定理。该文研究结果可进一步应用于完整和非完整约束系统。     

基于经典和Riesz导数的分数阶广义Birkhoff系统的Noether定理

为了研究分数阶模型下Birkhoff系统的对称性与守恒量之间的内在联系,该文提出并证明含经典和Riesz导数(包括Riesz-Riemann-Liouville导数和Riesz-Caputo导数)的分数阶广义Birkhoff系统的Noether定理。基于经典和Riesz导数的分数阶广义Pfaff-Birkhoff原理,导出相应的分数阶广义Birkhoff方程。分析系统的Noether对称性与守恒量,采用时间重新参数化方法证明分数阶Noether定理,并利用"传递公式"给出了分数阶守恒量的显形式。最后给出一个算例以说明其应用。     

基于El-Nabulsi分数阶模型的广义Birkhoff系统Noether对称性研究

为了进一步揭示力学系统的对称性与守恒量之间的内在关系,基于El-Nabulsi分数阶模型提出并研究了广义Birkhoff系统的Noether定理。首先,提出分数阶广义El-Nabulsi-PfaffBirkhoff原理,建立广义El-Nabulsi-Birkhoff方程。其次,基于El-Nabulsi-Pfaff作用量在无限小变换下的不变性,给出广义Birkhoff系统Noether对称性的定义和判据。最后,提出广义Birkhoff系统的Noether定理。该文研究结果可进一步应用于完整和非完整约束系统。     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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