容有半对称度量联络的广义复空间中子流形上的Chen不等式（英文）

在容有半对称度量联络的广义复空间中建立了子流形上的Chen不等式,这些不等式给出了子流形的平均曲率(关于半对称联络)与截面曲率,数量曲率之间的关系.     

具有半对称度量联络的广义 Ｓａｓａｋｉａｎ 空间形式中的子流形的 Ｃｈｅｎ-Ｒｉｃｃｉ 不等式

建立了具有半对称度量联络的广义 Ｓａｓａｋｉａｎ 空间形式中关于子流形的 Ｃｈｅｎ-Ｒｉｃｃｉ 不等式。 这些不等式刻画了子流形关于半对称度量联络的内在不变量(Ｒｉｃｃｉ 曲率)、ｋ-Ｒｉｃｃｉ 曲率与外在不变量(平均曲率平方‖Ｈ‖２ )之间的关系。     

具有半对称度量联络的广义Sasakian空间形式中的子流形的Chen-Ricci不等式

建立了具有半对称度量联络的广义Sasakian空间形式中关于子流形的Chen-Ricci不等式。 这些不等式刻画了子流形关于半对称度量联络的内在不变量(Ricci曲率)、k-Ricci曲率与外在不变量(平均曲率平方‖H‖²)之间的关系。     

具有半对称度量联络拟常曲率空间中子流形的Casorati曲率不等式

利用一个新的代数不等式,对具有半对称度量联络拟常曲率空间中的子流形建立了两个关于广义标准δ-Casorati曲率的不等式。     

具有半对称度量联络的广义Sasakian空间形式中子流形上的Chen不等式

利用代数技巧, 建立具有半对称度量联络的广义Sasakian空间形式中子流形上的Chen不等式, 给出了子流形关于半对称度量联络的平均曲率与子流形关于半对称度量联络的截面曲率和数量曲率等内在不变量之间的关系.     

局部共形Kaehler空间子流形的陈不等式

通过子流形的基本公式和1/4对称联络在局部共形Kaehler空间下的曲率张量,计算出了子流形的截面曲率以及数量曲率,利用二者的关系,得到了陈不等式,并且给出了其等式情况.     

关于半对称度量循环联络

对黎曼流形上的半对称度量循环联络引进截面曲率和迷向的概念,证明了黎曼流形M~n(n>2)容有迷向半对称度量循环联络的充要条件是M~n为共形平坦的,讨论了半对称度量循环联络在子流形上的诱导,得到半对称度量循环联络在子流形上的诱导亦是半对称度量循环联络。     

平行Ricci曲率黎曼流形中具有平行中曲率向量的子流形

研究了具有平行Ricci曲率黎曼流形中具有平行中曲率向量的子流形.获得了J.8imons型积分不等式,推广了局部对称空间该类子流形的相关结果.     

1／4对称度量联络在子流形上的诱导

研究了1/4对称度量联络在子流形上的诱导的概念,并且得到了其有一定条件的1/4对称度量联络在子流形上的诱导的一些性质,1）D^-上M^n第一基本形式与第一基本张量的关系;2）D^-关于M^m的平均曲率向量与M^n的平均曲率向量相等的条件。     

拟常曲率黎曼流形中的法联络平坦子流形

研究了拟常曲率黎曼流形中的法联络平坦子流形，将常曲率黎曼流形中B.Y.Chen和M.Okumura关于数量曲率和截面曲率关系之间一个著名不等式推广到环绕空间是拟常曲率黎曼流形的情形，作为应用，简捷地将M.Okumura的两个重要结果推广到这种环绕空间中法联络是平坦的子流形上去。     

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