单面完整系统相对于非惯性系的微分变分原理与守恒律

文章建立了非惯性系中单面完整约束力学系统的D'Alembert-Lagrange原理，基于微分变分原理在无限小变换下的不变性，给出非惯性系中单面完整约束系统的Noether定理及其逆定理，最后举例说明定理的应用。     

变质量单面非完整系统的Noether定理

本文研究了变质量单面非完整系统的Noether定理及逆定理.首先给出系统的d'Alember-Lagrange原理及非等时变分;其次基于微分变分原理在无限小变换下的不变性质,得到变质量单面非完整系统的Noether定理及逆定理;最后举例说明结果的应用.     

二阶单面非完整系统的Noether定理

研究二阶单面非完整系统的Ｎｏｅｔｈｅｒ定理及逆定理,首先给出系统的Ｇａｕｓｓ原理及非等时变化;其次基于微分变分原理在无限小变换下的不变性,得到了二阶单面非完整系统的Ｎｏｅｔｈｅｒ定理及逆定理;最后举例说明结果的应用。     

具有单面非完整约束系统的Raitzin正则形式的Noether定理及其逆定理

应用无限小变换的广义准对称变换，给出具有单面非完整约束系统的Raitzin正则形式的Noether定理及其逆定理。     

具有单面约束的非完整动力学系统的积分因子和守恒定理

本文提出了动力学系统守恒定律的构成的一般途径，首先，给出积分因子的定义，其次，详细地研究了守恒量存在的必要条件，建立了具有单面约束的非完整动力学系统的守恒定理及其逆定理，并举例说明结果的应用。     

事件空间中高阶单面非完整系统的守恒律

研究了事件空间中高阶单面非完整系统的守恒律。首先给出事件空间中的万有d‘Alembert原理和非等参数变分；其次基于该原理在无限小群变换下的不变性，得到事件空间中高阶单面非完整系统的守恒律；最后举例说明结果的应用。     

相空间中准坐标下非完整系统的Noether对称性

研究相空间中准坐标下完整系统和非完整系统的Noether对称性．首先,在相空间中引入准速度和准坐标,定义了用准速度表示的广义Hamilton函数和广义Hamilton作用量;基于广义Hamilton作用量在无限小变换下的不变性,得到了完整系统和非完整系统广义Hamilton作用量变分的基本原理;给出了相空间中准坐标下完整系统和非完整系统的Noether对称性、Noether准对称性和Noether广义准对称性的定义、判据及其Noether定理;并研究了该系统的Noether对称性逆问题．     

高阶非Четаев型非完整约束系统的广义守恒律

给出高阶非Четаев型约束加在m次速度空间中虚位移上的条件,研究m次速度空间中的非等时变分与无穷小变换,建立高阶非Четаев型非线性非完整非有势系统的广义Noether定理,并推广到变质量系统以及非惯性系中。     

广义Noether定理与非完整动力学逆问题

给出非完整动力学逆问题的一种提法和解法,利用非完整系统的广义Noether定理来解非完整动力学逆问题.     

具有单面约束的变质量完整非保守动力学系统的积分因子和守恒定理

提出了动力学系统守恒定律构成的一般途径，首先，给出积分因子的定义，其次，详细地研究了守恒量存在的必要条件，建立了具有单面约束的变质量完整非保守动力学系统的守恒定理及其逆定理，并举例说明结果的应用。     

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.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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