完整力学系统的形式不变性与非Noether守恒量

研究完整力学系统的由形式不变性导致的非Noether守恒量．建立系统的运动方程和形式不变性的判据方程．给出形式不变性为Lie对称性的充分必要条件．得到形式不变性导致非Noether守恒量的条件以及守恒量的形式．举例说明结果的应用．     

机电系统Mei对称性的共形不变性与守恒量

研究机电系统Mei对称性的共性不变性与守恒量．由系统的Lagrange—Maxwell方程,给出系统Mei对称性的共性不变性,导出系统Mei对称性的共性不变性的相关条件,得到系统的确定方程,讨论共形不变性与Noether对称性,Lie对称性以及Mei对称性之间的关系及相应的守恒量．举例说明结果的应用．     

约束Birkhoff方程的形式不变性与Lie对称性

研究约束Birkhoff方程的形式不变性和Lie对称性及其关系.给出了形式不变性和Lie对称性的定义和判据;然后导出形式不变性与Lie对称性的关系,指出形式不变性与Lie对称性的结构方程和守恒量有相同的形式;最后,给出一个说明性的例子.     

相空间中完整约束系统的形式不变性

研究相空间中完整力学系统正则方程的形式不变性 ,建立了完整约束系统形式不变性的确定方程和限制方程 ,给出了形式不变性导致守恒量的结构方程以及守恒量的形式 ,导出了形式不变性与Lie对称性的关系 ,并举例说明结果的应用。     

变质量完整力学系统的形式不变性与Lie对称性

研究变质量完整力学系统运动方程的形式不变性与Lie对称性的关系。首先 ,给出了形式不变性和Lie对称性的定义和判据 ;然后导出形式不变性与Lie对称性的关系 ,指出形式不变性与Lie对称性的结构方程和守恒量有相同的形式 ;最后 ,给出一个说明性的例子。     

有多余坐标完整力学系统的形式不变性与非Noether守恒量

研究有多余坐标完整力学系统的形式不变性与非Noether守恒量．首先,建立了系统的运动微分方程,给出了系统在仅依赖于广义坐标的无限小变换下的形式不变性和Lie对称性的定义和判据,讨论了形式不变性与Lie对称性的关系;其次,给出了形式不变性导致非Noether守恒量的条件及守恒量的形式;最后,举例说明结果的应用．     

完整力学系统的Hojman守恒量(Ⅲ)

研究完整力学系统形式不变性导致的Hojman守恒量．首先，研究特殊无限小变换下系统的形式不变性；其次，给出形式不变性与Lie对称性的关系；最后，给出Hojman定理的推广并举例说明结果的应用．     

带有伺服约束的非完整系统Mei对称性和Lie对称性

利用代数方程和微分方程在无限小变换下的不变性,研究带有伺服约束的非完整系统的Mei对称性和Lie对称性,给出Mei对称性的判据方程和结构方程及系统同时是Mei对称性和Lie对称性的定理,得到守恒量的具体形式.     

变质量完整力学系统的形式不变性与非Noether守恒量

利用时间不变的特殊无限小变换下的形式不变性，研究变质量完整力学系统的非Noether守恒量，建立系统的运动微分方程，研究特殊无限小变换下系统形式不变性的定义和判据，给出形式不变性为Lie对称性的充要条件，得到形式不变性导致非Noether守恒量的条件以及守恒量的形式，举例说明结果的应用。     

Appell方程的形式不变性与Lie对称性

在群的无限小变换下研究Appell方程的形式不变性与Lie对称性的关系，寻求系统的守恒量。给出一个例子说明结果的应用。     

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