一个无限维弱余分裂李代数

通过构造复数域?上无限维李代数Witt代数的李余代数结构,解决了无限维李代数Witt代数是否为弱余分裂李代数的问题.     

Witt代数的新定义

给出了满足一些条件的李代数,并且证明了这类李代数和Witt代数同构.这也说明了Witt代数的结构在某种意义下是唯一确定的.     

W(0,1)的中心扩张上的Poisson结构

Poisson代数是指同时具有代数结构和李代数结构的一类代数,其代数结构和李代数结构满足Leibniz法则.W(a,b)型李代数是Witt代数与其密度张量模的半直积,很多无穷维李代数具有这种结构.利用根系阶化的方法先确定李代数W(0,1)上的Poisson代数结构,进一步确定李代数W(0,1)的中心扩张Vir(0,1)上的Poisson代数结构.     

有限域上Cartan型李代数表示的一点注记

得到了当特征函数x的高度小于或等于0时,Cartan型李代数在代数封闭域k=Fq上的不可约广义x-约化表示分裂的一个充分必要条件.在Witt代数情形,对于一般的特征函数x,得到了相应的结论.     

预李-Yamaguti着色代数与着色O-算子

引入了预李-Yamaguti着色代数的概念,给出了李-Yamaguti着色代数的关于表示空间的着色O-算子,讨论其与预李-Yamaguti着色代数的关系,证明了一个预李-Yamaguti着色代数可以得到一个李-Yamaguti着色代数和一个它自身上的表示。     

素特征域上sl(0,3)在广义Witt李超代数上的中心化子

在素特征域上研究了特殊线性李超代数sl(0,3)在广义Witt李超代数上的中心化子.利用Witt李超代数直和分解与解线性方程组的方法确定了sl(0,3)在广义Witt型李超代数的中心化子.     

与Virasoro代数有关的李代数L的结果

利用李代数L=m∈Z(CLmCEm)包含无中心的Virasoro代数(Witt代数)作为李代数L的子代数,研究L的导子和中心扩张等问题.结果表明L是一个无限维的Complete李代数并且L的泛中心扩张在Leibniz代数范畴与李代数范畴是相同的.     

一类无穷维李代数的自同构群

令W表示秩为1的Witt代数,是定义在除去2个固定点为正则的Riemann球面上的半纯向量场李代数,也是一个圈上多项式向量场李代数的复化及罗朗多项式环的导子李代数,在数学和物理学的很多领域中有着重要应用.设V是一个向量空间,由某种作用将其看作W-模.设G是Witt代数W由模V得到的分裂扩张.主要研究了分裂扩张G的结构,并给出了G的自同构群,所得结果丰富了李理论的内容.     

Hom-型Witt李超代数的中心扩张和第二上同调群

Hom-型Witt李超代数是一个由σ-导子构造出来的q-形变的Witt李超代数.在本文中作者给出了该代数的中心扩张并计算了它的第二上同调群.     

Witt 代数的二阶限制上同调群

本文讨论了有限维限制李代数的限制上同调群的一些性质,并给出了系数在限制不可约模中 Witt 代数的二阶限制上同调群的结构。     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the