核靶对Drell—Yan过程K因子的影响

在微扰ＱＣＤ Ｏ（αｓ）领头阶对数近似下,采用双重Ｑ＾２－重标度模型,计算了Ｐ－Ａ碰撞Ｄｒｅｌｌ－Ｙａｎ过程Ｋ因子,并与Ｐ－Ｎ碰撞Ｄｒｅｌｌ－Ｙａｎ过程Ｋ因子进行比较。计算结果表明Ｋ因子对核质量数Ａ有很强的依赖性,且在ｘＡ〈０．１区域,随ｘＡ的减小核效应越显著。与未来实现相对照,可以检验所用的核效应理论模型及微扰ＱＣＤ理论。     

C-C核碰撞Drell-Yan过程K因子的非常数性

在Ｄｒｅｌｌ－Ｙａｎ过程中计入湮灭项和康普顿散项的贡献,利用双重Ｑ＾２－重标度模型,计算了碳核与碳核碰撞在给定不同的ｘＡ１值时Ｋ因子随ｘＡ２的变化结果表明,对应不同的ｘＡ１值,Ｋ因子随ｘＡ２的变化曲线形状很不相同。计算结果与实验对照可以检验所用核效应的模型及ＱＣＤ理论。     

QCD修正对P-A碰撞Drell-Yan过程的贡献

在微扰ＱＣＤαｓ近似下，采用双重Ｑ＾２－重标度模型，计算了ａｓ级ＱＣＤ修正对Ｐ－Ａ（＾１２ ６Ｃ，４０ ２０Ｃａ，＾５６ ２６Ｆｅ）碰撞Ｄｒｅｌｌ－Ｙａｎ过程微分截面的贡献，说明了对于核Ｄｒｅｌｌ－Ｙａｎ过程截面的计算，ＱＣＤ修正是不容忽略的。     

高能P—Ca碰撞的核效应与价夸克分布和海夸克分布

提出了一个由ｌ－Ａ的深度非弹性散射和核Ｄｒｅｌ－Ｙａｎ过程的实验数据得到价夸克分布和海夸克分布的核效应的函数ＲＡｖ（ｘｔ）和ＲＡｓ（ｘｔ）的方法．这两个函数可以用来检验核子结构函数的核效应的理论模型．文中以钙核为例求出了ＲＣａｖ（ｘｔ）和ＲＣａｓ（ｘｔ）．     

碳核价夸克与海夸克分布的核效应

提出了一个由１－Ａ的深度非弹性散射和核Ｄｒｅｌ－Ｙａｎ过程的实验数据得到价夸克分布和海夸克分布的核效应的函数ＲＡＶ（ｘｔ）和ＲＡｓ（ｘｔ）的方法。这两个函数可以用来检验核子结构的核效应的理论模型。文中以碳核为例求出了ＲＣｖ（ｘｔ）和ＲＣｓ（ｘｔ）。     

量子色动力学中K因子的研究

提出了微扰ＱＣＤ的高级修正Ｋ因子的经验公式，与有关实验符合得相当好。Ｋ因子随ｍ的增大而缓慢减小这一事实支持了ＱＣＤ渐进自由性质的一贯要求和以往关于Ｋ因子的直接实验结果。指出各种Ｄ－Ｙ过程的动力学实质相同，Ｋ因子经验公式的动力学实质有待进一步研究。     

核Drell-Yan过程和混合重标度模型

利用混合重标度模型计算铁核与氘核的Ｄｒｅｌ－Ｙａｎ截面比随ｘＦ的变化，计算结果与实验符合较好     

关于价夸克分布与海夸克分布的核效应

提出了一个由轻子－核深度非弹性散射和核Ｄｒｅｌ－Ｙａｎ过程的实验数据得到价夸克分布和海夸克分布的核效应函数ＲΑυ（χｔ）和ＲＡｓ（χｔ）的方法。由这两个函数可以检验解释核效应的理论模型。以铁、钙、碳核为例进行了讨论     

价夸克分布与海夸克分布的核效应

由ｌ－Ａ深度非弹性散射实验数据结合ｐ－Ａ碰撞Ｄｒｅｌｌ－Ｙａｎ截面数据来分别考察束缚核子中价夸克分布与海夸克分布的核效应，提出了一种检验解释ＥＭＣ效应的理论模型的方法。     

质子自旋结构函数的QCD求和规则

利用ＱＣＤ求和规则，在忽略奇异海夸克效应近似下，计算了核子同位旋标量轴矢流耦合常数ｇＡ＾ｓ。在极化函数物非微扰部分，本文计算了∫０×１ｄｘｇ１＾（ｐ）（ｘ）的三胶子凝聚修正。在ＱＣＤ修正的组合夸克模型中，分析了质子的自旋结构函数，并得到Ｓ夸克对ｇＡ＾ｓ的贡献。     

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