π、ρ介子和σ、ω交换图对相对论光学势的贡献

本文基于QHD理论、导出了π、ρ介子和σ、ω交换图对相对论光学势虚部的贡献。这些解析表达式可直接用于数值计算并同实验结果对照。     

N^＊（1535）强耦合效应对η介子核束缚态的影响

类比”核散射的△-空穴模型得到N^＊-空穴激发态下的η介子自能，将η介子的运动方程与相对论平均场相结合，求解有限核^12C，^40Ca和^208Pb中η介子的束缚态．计算结果显示在η介子的自能中考虑N和N^＊的核介质修正效应对可介子光学势有很大影响．考虑N和N^＊的核介质修正效应后，η介子的束缚态的宽度依赖于N^＊（1535）自能的实部的选取．     

N*(1 535)强耦合效应对η介子核束缚态的影响

类比π核散射的△-空穴模型得到N*-空穴激发态下的η介子自能,将η介子的运动方程与相对论平均场相结合,求解有限核12C,40Ca和208Pb中η介子的束缚态.计算结果显示在η介子的自能中考虑N和N*的核介质修正效应对η介子光学势有很大影响.考虑N和N*的核介质修正效应后,η介子的束缚态的宽度依赖于N*(1 535)自能的实部的选取.     

奇异原子中的相互作用及其能级

为进一步研究K介子原子和∑超子原子两类奇异原子中的相互作用和能量问题，具体数值求解了Klein-Gordon方程和Dirac方程，得到K介子原子和∑超子原子的相应能级，结果与实验数据吻合得相当好，其相对误差最大的仅为-0．058％和0．035％，光学模型势应用于奇异原子能级计算能够提高理论结果的准确性。这表明光学势正确地反映了介子或超子与核子之间的强相互作用，并且表明核子间的强相互作用力为吸引力。     

反质子与质子相互作用

本文论述从低能至高能的反质子与质子碰撞中各种现象,从介子交换理论和吸收现象,获得一个可以描述其相互作用的光学势。pp碰撞后,发生湮没而产生众多的介子、强子,以及在高能正、反质子湮没后产生奇特性粒子,带粲的介子、强子,并探讨获得混杂性粒子和新粒子的途径。     

奇异原子能级与光学模型势

为进一步研究K^-介子原子和∑^-超子原子2类奇异原子中的相互作用和能量问题,基于二阶线性偏微分方程的差分数值解法求解了Klein-Gordon方程和Dirac方程,得到K介子原子和∑-超子原子的相应能级．其结果与实验数据的最大误差分别仅为-0．051％和0．035％,这表明光学模型势应用于奇异原予能级计算能够提高理论结果的准确性．此结果连同π^-原子、P原子的情况支持了Batty光学模型势在奇异原子中应用的正确性,进而表明核子间的强相互作用力为排斥力．     

一套新的3He普适唯象光学势参数

通过同时符合3He引起的核反应截面和弹性散射角分布实验数据,获得了一套适用于靶核质量数为20≤A≤209,3He入射能量从阈能到250 MeV的普适唯象光学势.对3He普适唯象光学势进行物理分析,计算和分析了3He普适唯象光学势实部和虚部的径向关系.结果表明,这套3He普适唯象光学势在物理上是合理的.     

重介子谱的真空色屏蔽效应

在重夸克势模型理论框架下，研究了重介子谱的色屏蔽效应，结果表明，具有真空色屏蔽效应的重夸克势对重介子的实验能谱给出了更好的理论解释。     

πN势对重离子碰撞中π介子集体流的影响

中能重离子碰撞中产生的π介子是研究高密核物质状态方程一个重要的探针.而影响π介子在核介质中输运的π介子与核子相互作用势(πN势)目前还没有完全确定.在最近更新的极端相对论量子分子动力学(UrQMD)模型中加入一种经验的πN势,研究了它对π+和π-介子集体流的影响.通过与FOPI合作组实验数据的比较发现,考虑一个较弱的πN势可以同时半定量地解释直接流和椭圆流随快度及横向速度的变化情况,而考虑强的πN势或者不考虑πN势给出的结果都与实验数据有很大差异.     

介子结构的一种位势模型

在层子模型的基础上,应用B—S方程讨论了介子结构.结果指出,在赝标与标量的迭加耦合下,采用深底方位阱、谐振势与库仓型势的迭加位势,能解释0~-介子与1~-介子的能谱等特性.     

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