多模光场与二能级原子Nj度简并N^∑光子共振相互作用系统中场量了熵与纠缠的演化

利用冯·纽曼量子约化熵理论研究了多模相干态光场与单个二能级原子简并多光子共振相互作用系统中场量子熵与纠缠的时间演化特性,得到了多模光场量子熵的解析表达式,并给出了三模场与原子相互作用时场量子熵的数值计算结果,详细讨论了此时初始平均光子数、原子分布角以及原子偶极相位角对场量子熵与纠缠的影响。数值计算结果表明：初始光场越强,场与原子之间的量子纠缠越弱,当光场足够强时,两子系统几乎始终处于退纠缠状态;场量子熵强烈地依赖于原子分布角,光场与原子总是处于纠缠态,并且在短时间的振荡之后几乎停留在最大纠缠态,而原子分布角越大,场量子熵演化到其最大值的时间越短;原子偶极相位角对场与原子之间的量子纠缠几乎没有影响。根据场量子熵的这些特性,可以制备纠缠态或纯态。     

多模光场与二能级原子N_j度简并N~∑光子共振相互作用系统中场量子熵与纠缠的演化

利用冯·纽曼量子约化熵理论研究了多模相干态光场与单个二能级原子简并多光子共振相互作用系统中场量子熵与纠缠的时间演化特性,得到了多模光场量子熵的解析表达式,并给出了三模场与原子相互作用时场量子熵的数值计算结果,详细讨论了此时初始平均光子数、原子分布角以及原子偶极相位角对场量子熵与纠缠的影响.数值计算结果表明:初始光场越强,场与原子之间的量子纠缠越弱,当光场足够强时,两子系统几乎始终处于退纠缠状态;场量子熵强烈地依赖于原子分布角,光场与原子总是处于纠缠态,并且在短时间的振荡之后几乎停留在最大纠缠态,而原子分布角越大,场量子熵演化到其最大值的时间越短;原子偶极相位角对场与原子之间的量子纠缠几乎没有影响.根据场量子熵的这些特性,可以制备纠缠态或纯态.     

级联三能级原子与光场相互作用模型中的保真度

运用了全量子理论,对级联三能级原子和单模光场作用模型中的保真度演化特性进行了研究,讨论了影响保真度的因素。结果显示,系统的保真度主要取决于原子和光场之间的关联程度,当原子处于高能态时,原子和光场关联增强,光场和原子的保真度降低;原子处在低能态时,光场和原子的关联性减弱,光场和原子的保真度增加。     

三能级原子在双模激光场作用下的偶极压缩效应

应用量子电动力学理论,研究了三能级原子在双模激光场作用下的偶极压缩效应．结果表明,在弱光场作用下,三能级原子呈现明显的偶极压缩效应,偶极压缩与双模光场的强度以及原子与光场的耦合强度有密切的关联     

在双模相干光场作用下的三能级原子的偶极压缩效应

应用量子光学理论，研究了在双模具干光场作用下三能级原子的偶极压缩效应，结果表明，在弱光场作用下，三能级原子呈现明显的偶极压缩效应，偶极压缩的大小和频率与双模相干光场的强度和失谐量的大小以及原子与光场的耦合强度有密切的关联。     

三能级原子在双模激场作用下的偶极压缩效应

应用量子电动力学理论，研究了三能级原子在双模激场作用下的偶极压缩效应，结果表明，在弱光场作用下，三能级原子呈现明显的偶极压缩效应，偶极压缩与双模光场的强度以及原子与光场的耦合强度有密切的关联。     

四能级Λ-型原子系统中自发诱导相干对无反转激光的效应

讨论了四能级Λ-型原子系统自发诱导相干(SGC)对原子系统产生无反转激光的影响。原子系统在与一个弱探测光场及强泵浦光场共振相互作用情况下,不论是否双光子共振,原子系统都有无反转激光(LWI)产生。在双光子共振条件下,SGC效应可强化LWI的产生;在非双光子共振时,改变SGC参量和上能级之间能级差可有效控制LWI的产生及其产生的强度。文中给出了产生LWI的相应条件。     

纠缠态原子与双模压缩态光场相互作用中的纠缠特性

对于处于纠缠态的2个原子与双模压缩光场的相互作用,研究了原子与光场之间以及双模光场中2模之间的纠缠性质.令2个原子中的一个留在腔外,另一个进入腔中与光场发生相互作用,发现一般情况下纠缠度随时间周期性地变化,并且周期不受腔外原子的旋转角度以及纠缠态中相位差的影响;但当光场态中的压缩参量与腔外原子的旋转角度满足一定关系时,原子与光场会一直处于解纠缠状态.     

非旋波近似下纠缠态在腔场与原子之间相互转化特性的研究

利用全量子理论,精确求解了非旋波近似下多个二能级原子与单模光场构成的联合系统态矢量的演化规律,讨论了旋波近似下和非旋波近似下纠缠态在光场与原子之间的转化过程.结果表明：旋波近似下,原子纠缠态与光场纠缠态可以方便的交换传递或保持.非旋波近似下,虚光场效应对纠缠态在腔场与原子之间相互转化的过程有明显的影响：光场纠缠信息传递给原子后腔场未能恢复到真空态;伴随着纠缠态的转化和保持过程,相位有所改变并产生了多项干扰.     

弱相干场耦合腔系统中原子偶极压缩

考虑将3个全同的二能级原子分别囚禁在3个耦合腔中,并且腔场处于弱相干态的情况。利用数值计算方法研究了原子的偶极压缩效应,讨论了腔场间的耦合系数和腔场的强度对原子偶极压缩的影响。研究结果表明:随腔场间耦合增强,压缩效应减弱。另一方面,随弱相干光场强度的加强,原子的偶极压缩效应增强。     

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     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with