广义旗流形SO(14)/U(1)×U(2)×SO(8)上不变爱因斯坦度量(英文)

利用计算机得到广义旗流形SO(14)/U(1)×U(2)×SO(8)的爱因斯坦方程组的十二正实数解(差常数倍的情况下),其中8个是非Khler爱因斯坦度量,4个是Khler爱因斯坦度量.     

广义旗流形上不变爱因斯坦度量与结构等测地向量

满旗流形SU(n)/T上至少有n!/2+n+1个不变的爱因斯坦度量,其中n!/2个是Khler爱因斯坦度量.但当n5时关于满旗流形SU(n)/T上不变爱因斯坦度量至今没有更多的结果.本文得到满旗流形SU(5)/T上在差常数倍的情况下有386个不变的爱因斯坦度量.这是用度量对满旗流形SU(n)/T(n5)进行分类的最新结果.然后作者考虑了第二Betti数为1的广义旗流形上结构等测地向量.     

广义旗流形上不变爱因斯坦度量与结构等测地向量（英文）

满旗流形SU(n)/T上至少有n!/2+n+1个不变的爱因斯坦度量,其中n!/2个是Khler爱因斯坦度量.但当n5时关于满旗流形SU(n)/T上不变爱因斯坦度量至今没有更多的结果.本文得到满旗流形SU(5)/T上在差常数倍的情况下有386个不变的爱因斯坦度量.这是用度量对满旗流形SU(n)/T(n5)进行分类的最新结果.然后作者考虑了第二Betti数为1的广义旗流形上结构等测地向量.     

广义旗流形SU(5)/U3(1)×SU(2)齐性变爱因斯坦度量

利用李代数的知识可以计算旗流形M=SU(5)/U3(1)×SU(2)上非零的结构常数ckij,然后把非零的ckij代入Ricc张量的分量γ1,…,γ6.旗流形M上G不变的黎曼度量g是爱因斯坦度量当且仅当存在正常数e,使得γ 1=γ2=γ 3=γ4=γ5=γ6=e.利用计算Gr(o)bner基的方法得到爱因斯坦方程组有27个正的实数解,即广义旗流形M=SU(5)/U3(1)×SU(2)上有27个不变的爱因斯坦度量(在差常数倍的情况下),其中12个是凯莱爱因斯坦度量,15个是非凯莱爱因斯坦度量.     

广义旗流形SU(5)/U~3(1)×SU(2)齐性变爱因斯坦度量（英文）

利用李代数的知识可以计算旗流形M=SU(5)/U3(1)×SU(2)上非零的结构常数ck ij,然后把非零的ck ij代入Ricc张量的分量γ1,…,γ6.旗流形M上G-不变的黎曼度量g是爱因斯坦度量当且仅当存在正常数e,使得γ1=γ2=γ3=γ4=γ5=γ6=e.利用计算Grbner基的方法得到爱因斯坦方程组有27个正的实数解,即广义旗流形M=SU(5)/U3(1)×SU(2)上有27个不变的爱因斯坦度量(在差常数倍的情况下),其中12个是凯莱爱因斯坦度量,15个是非凯莱爱因斯坦度量.     

Khler流形的若干判定定理

利用Khler流形的有关理论知识,证明了3个结论：局部共形Khler流形为Khler流形的若干等价条件;满足一定条件的曲率张量的局部共形Khler流形一定是Khler流形;判定Khler流形的两种具体方法。     

Khler流形上的L~2调和形式

讨论具有权Poincaré不等式完备非紧的Khler流形,证明了当Ricci具有与权函数有关的下界时流形上的L2调和1-形式是退化的,从而推广了LAM对于完备非紧Khler流形所得的结果.     

仿射流形上的Monge-Ampere度量

作者研究了仿射流形上的Khler仿射度量,其势函数满足仿射超球方程,证明了满足此条件的Khler仿射度量是Monge-Ampere度量.     

C~3中曲面Khler角的刚性定理（英文）

浸入到近复Hermit流形的曲面的Khler角是一个重要的不变量,可以用于刻画曲面偏离拟全纯曲线的程度.近年来,具有常Khler角的曲面仍是很有意义的研究对象.对于3维复欧氏空间C~3中具有常Khler角的曲面收缩子,本文证明了两个刚性定理.这些定理是有关C~3中曲面自收缩子的相应定理的直接拓展.     

紧致局部共形Kahler流形上Morse-Novikov上同调群的一个关系

利用谱序列方法,作者证明了紧致局部共形Khler流形上关于Morse-Novikov上同调群的一个关系,这个关系可以看作一般紧致复流形上Frlicher关系的类比.同时,作者证明了在维数大于2的对角Hopf流形上存在局部共形Khler结构,使得其Morse-Novikov上同调群分别满足对称性和直和性.     

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