量子相空间理论与Bose-Einstein凝聚态

探讨了Torres-Vega和Frederick量子相空间表象的特征,并揭示了相空间中波函数的不唯一性。在该量子相空间表象框架下,获得了用于模拟Bose-Einstein凝聚态的非线性Schr dinger方程的严格解。所得到的本征函数可通过“类Fourier”投影变换分别投影到位移空间和动量空间中去,从而得到相应空间中的本征函数。     

量子相空间理论与氢原子严格解

探讨了Torres-Vega和Frederick量子相空间表象中的波动力学方法,以及相空间表象与位移表象和动量表象之间的"类Fourier"投影变换;获得了一维氢原子体系定态Schr(o)dinger方程在相空间表象中的严格解;揭示了相空间中波函数的不唯一性.     

关于表象变换的一点注解

分别研究了自旋算符及其本征函数从Sz表象到Sx表象的变换.研究表明,利用由^Sx的本征函数的表象变换式计算得到的变换矩阵和喀兴林(1988)中的变换方法进行自旋分量算符的变换,变换结果中出现一个与^Sx和^Sz的对易关系不相融洽的负号;此外,该变换矩阵不能应用于^Sz或者^Sy的本征函数从Sz表象到Sx表象的变换.阐明了一个算符及其本征函数的表象变换矩阵应该由该算符自己的本征函数从旧表象到新表象的变换定义式确定.     

量子相空间表象下的含时微扰理论

在Torres-Vega和Frederick(简称T-F)量子相空间的理论框架下,研究量子相空间表象下的量子跃迁问题.建立了T-F量子相空间表象下的含时微扰理论的基本公式,使之能符合相空间表象下的理论计算.以在含时外电场作用下的一维谐振子的跃迁为例进行了理论计算.结果表明:由该公式得到的计算结果是正确的,并对利用该计算结果做出的谐振子的第一激发态受微扰后的相空间中的几率密度分布图进行了讨论.     

基于谐振子体系的量子相空间微扰理论研究

在Torres—Vega和Frederick（T-F）量子相空间表象中研究了非简并态的微扰论,在一级修正的基础上,得到了能量本征值和本征波函数的二级、三级近似解。利用谐振子体系在相空间表象下的几率分布图与坐标和动量表象中的几率分布图的对比,显示在量子相空间中研究体系的微扰时,可以得到比坐标或动量表象中更多的信息。     

可观测物理量的本征函数应为无穷多个

通过分析矩阵力学不同表象中力学量的本征值问题，并利用线性代数的矩阵运算法则，推导出可 物理一的本征函数的个数应为无穷多个。     

基于谐振子体系的量子相空间微扰理论研究

在Torres-Vega和Frederick(T-F)量子相空问表象中研究了非简并态的微扰论,在一级修正的基础上,得到了能量本征值和本征波函数的二级、三级近似解.利用谐振子体系在相空间表象下的几率分布图与坐标和动量表象中的几率分布图的对比,显示在量子相空间中研究体系的微扰时,可以得到比坐标或动量表象中更多的信息.     

量子相空间中相互垂直的静电场和强磁场条件下带电粒子体系的严格解

本论文在Torres-Vega和Frederick的量子相空间理论框架内,对相互垂直的静电场和强磁场这一特定条件下带电粒子体系的T-F量子相空间表象中的Schr-dinger方程进行了严格求解,并获得了其精确解.同时发现该体系在相空间中的量子几率密度取决于磁场强度的大小和带电粒子能级的高低, 结论由Heisenberg测不准原理给予了解释.     

角动量算符的表象变换与坐标轮换

利用矩阵表示，讨论了角动量算符及本征函数在不同表象中的标准变换关系；并证明由坐标轮换所得的结果与么正变换不相符．因此在算符与本征函数同时变换时不能采用坐标轮换．     

关于空间群的C-G系数及IR表示的计算中位相因子的处理方法

利用量子力学中的本征函数法^[1,2]详细讨论计算空间群的表象群的不可约表示(IR矩阵)及IR基时位相因子的处理^[3,4]，以及讨论了C—G系数的计算中的位相因子的处理方法．     

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