电场对抛物量子线中强耦合极化子性质的影响

采用线性组合算符法和变分法研究了电场对抛物量子线中强耦合极化子性质的影响，在考虑电子与LO声子相互作用和加电场的情况下，计算了抛物量子线中强耦合极化子的基态能量．数值计算结果表明：抛物量子线中强耦合极化子的基态能量Eo随约束强度ω0的增强而增大，而随电场强度F和量子线长Z的增大而单调减小．     

磁场对抛物量子线中强耦合极化子基态能量的影响

本文研究磁场对抛物量子线中强耦合磁极化子基态能量的影响．采用Tcbda改进的线性组合算符法和变分法，在考虑电子与LO声子相互作用情况下，计算了抛物量子线中强耦合磁极化子的基态能量．数值计算结果表明：抛物量子线中磁极化子的基态能量E0随约束强度ω0、回旋频率ωc的增大而增大．     

量子线中强耦合极化子的振动频率

应用Huybrechts线性组合算符和幺正变换方法,研究了抛物量子线中强耦合极化子的性质.导出了抛物量子线中强耦合极化子基态能量、振动频率和声子平均数随量子线的约束强度和电子—声子耦合强度的变化关系.数值计算表明:抛物量子线中强耦合的振动频率和声子平均数均随约束强度和耦合强度的增大而增加.     

量子线中弱耦合束缚极化子的性质

采用改进的线性组合算符和幺正变换方法研究了库仑场对抛物量子线中弱耦合极化子性质的影响.计算了抛物量子线中弱耦合束缚极化子的基态能量、振动频率和声子平均数.讨论了这些量对库仑束缚势和约束强度的依赖关系.数值结果表明:量子线中弱耦合极化子的基态能量随库仑束缚势的增加而减少,随约束强度的增加而增大;振动频率随库仑束缚势的增加而增加,随约束强度的增加而增大;声子平均数随着约束强度的增加而增加,随库仑束缚势的增加而减少.     

抛物量子线中极化子的光学声子平均数

采用线性组合算符法和变分法，在考虑电子—LO声子相互作用情况下，分别计算了抛物量子线中强、弱耦合情形下极化子的振动频率和光学声子平均数．数值计算结果表明，两种情况下，光学声子平均数都随耦合强度的增大而增大．强耦合极化子的振动频率和声子平均数随有效受限长度的减小而迅速增大。     

抛物量子点中极化子性质的研究进展

综述了近年来对抛物量子点中极化子性质方面的部分工作．在第一节中从电子-LO声子系的哈密顿出发首次采用线性组合算符和幺正变换方法，研究抛物量子点中弱耦合极化子的基态能量和结合能的性质．在第二节中研究量子点中与LO声子强耦合极化子的振动频率、基态能量、结合能和光学声子平均数的性质．在第三节中采用改进的线性组合算符方法研究抛物量子点中弱耦合极化子的相互作用能和有效质量的性质．在第四节中研究抛物量子点中与LO声子强耦合极化子的振动频率、相互作用能和有效质量的性质．在第五节中采用Pekar变分方法研究抛物量子点中强耦合极化子基态和激发态的性质．     

声子色散和磁场对极化子基态的影响

采用线性组合算符和幺正变换的方法,得出极化子基态能量与色散系数、耦合强度以及磁场强度之间的关系.数值计算表明：对弱耦合极化子,振动频率λ随磁场强度的增大而单调增大;基态能量E0随磁场强度增大而增大、随耦合系数α增大而单调下降、随色散系数γ增大而减小.对强耦合极化子,基态能量E0随磁场强度增大而增大、随耦合系数α增大而单调下降、与声子色散无关.     

Rashba效应影响下半导体量子点中强耦合极化子的声子平均数

采用改进的线性组合算符方法，研究了Rashba效应影响下半导体量子点中强耦合极化子的光学声子平均数．导出在电子-体纵光学声子（LO）强耦合时抛物量子点中极化子的光学声子平均数、振动频率、相互作用能和有效质量随受限强度和Rashba自旋-轨道耦合常数的变化．数值计算结果表明Rashba自旋-轨道相互作用使极化子的有效质量、基态能分裂为上下两支，随耦合常数的增加极化子基态能量、有效质量表现为增加和较少两种截然相反的情形；Rashba自旋-轨道相互作用影响下强耦合极化子的光学声子平均数随量子点的受限强度、电子声子耦合强度增大而增大，极化子的相互作用能随受限强度的增加先急剧增加，当达到极值后随受限强度的增加而急剧减少．     

量子阱中束缚光学极化子

采用线性组合算符及幺正变换方法研究了量子阱中强、弱耦合束缚光学极化子的性质．导出了量子阱中束缚光学极化子的基态能量与库仑束缚势、电子-LO声子的耦合强度和阱宽的变化关系．通过数值计算结果表明：基态能量因电子-LO声子的耦合强度和库仑束缚势的不同而不同，它随电子-LO声子的耦合强度和库仑束缚势的增大而增大，当电子-LO声子的耦合强度和库仑束缚势取某一定值时随阱宽的增大而增大．     

磁场作用下量子阱中极化子的性质

研究了磁场作用下量子阱中弱耦合极化子的性质,计算了磁极化子的有效质量并分别讨论了磁极化子基态能量与其他物理量之间的关系。结果表明:量子阱中弱耦合磁极化子的有效质量仅与耦合强度α有关,且随α增大而迅速增大。随着阱宽的减小基态能量迅速增加,说明量子尺寸效应较显著;基态能量随磁场回旋频率和极化子的速度的增加而增大。     

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.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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-