增加光子奇(偶)对相干态的非经典特性

构造了增加光子奇(偶)对相干态并用数值模拟方法研究了它们的非经典性质.结果表明,增加光子奇(偶)对相干态都具有光子统计的亚泊松分布以及反聚束效应等非经典性质,是新型量子光场.在奇(偶)对相干态的两个场模上增加光子,都可以增强光场光子统计的亚泊松分布特性.     

光子双模压缩真空态及其叠加态的非经典特性

在光子双模压缩真空态|ξ〉上增加m个光子构成光子双模压缩真空态a m|ξ〉,利用量子力学的态叠加原理,构造出光子双模压缩真空态的叠加态|ψ〉,并通过数值计算研究了叠加态|ψ〉的非经典特性.结果表明:在一定的条件下,叠加态|ψ〉的平均光子数呈现出崩塌与复原的振荡现象,而且亚泊松特性和位相压缩都比单个a m|ξ〉态的情况强.     

非线性Jaynes-Cummings模型相干场光子统计特性

研究了相干态光场和原子的相互作用,在这一过程中光场展现出反聚束和光子亚泊松分布现象.着重分析了相干态光场在此作用过程中所展现出的光子统计特性.可以看出相干态光场的平均光子数和多光子跃迁对光场非经典性质有强烈地影响.     

单模相干态和压缩态光场的量子统计特性

该文总结了单模相干态和压缩态光场的量子统计特性,并通过Fano因子及二阶相干度g~(2)(0)的具体表达式,讨论了单模压缩态光场的反聚束效应(ABE)和光子数亚泊松分布(subP)。     

非线性Jaynes-Cummings模型相干场光子统计特性

研究了相干态光场和原子的相互作用,在这一过程中光场展现出反聚束和光子亚泊松分布现象。着重分析了相干态光场在此作用过程中所展现出的光子统计特性。可以看出相干态光场的平均光子数和多光子跃迁对光场非经典性质有强烈地影响。     

平移激发奇偶相干态

定义两类新非经典态平移激发偶奇相干态D(β)a+m| α＞e和D(β)a+m|α＞.,讨论了它们的量子统计特性,其数值计算结果表明,显现出了亚泊松分布和反聚束效应等显著的非经典光场态的物理特征.     

q-形变振幅相干态的非经典效应

运用数值计算方法研究了迭加系数、形变参数对q-振幅相干态|ψ〉q的量子统计性质的影响,发现q-形变振幅相干态与通常的振幅相干态有着显著不同的量子统计性质.在0相似文献   

激发正交相干态的构建及其量子特性

利用产生算符作用在正交相干态上构造新的量子态的方法,构造了激发正交相干态。采用数值计算方法,通过对光场的两个正交分量涨落、二阶关联函数、Mandel Q参量的计算,讨论了该量子态的统计性质,并研究了产生算符作用次数和相干态平均光子数对其量子特性的影响。结果表明:激发正交相干态不呈现压缩效应,但呈现出反聚束效应和亚泊松分布性质,并且随平均光子数增大它的反聚束效应、亚泊松分布性质均减弱。另外,算符作用次数对其量子特性有重大影响,选择二次作用对增强态的反聚束效应和亚泊松分布性质有利。     

增加光子对和减少光子对相干态的等阶Y压缩效应

通过数值计算,研究了增加光子对相干态|,ξq;m〉A=a m|,ξq〉和减少光子对相干态|,ξq;-m〉S=bm|,ξq〉的等阶Y压缩效应.结果表明:对于增加光子对相干态a m|,ξq〉和减少光子对相干态bm|,ξq〉,光场都存在着等阶K(=2,3,4,5…)次方Y压缩效应,但是增加a模的光子或取走b模的光子,即随着场模上光子增加(减少)数m的增大,二者的等阶K次方Y压缩效应均减弱,且有相似的曲线变化规律.     

q变形相干态的亚泊松特性与反聚束效应

定义q变形相干态的Mandel Q参数,导出q变形Mandel Q参数和q变形二阶相关函数的关系,证明在q变形的情况下,单模光场的亚泊松特性与反聚束效应不是等价的,并对增光子k玻色子q相干态的亚泊松特性进行数值研究,结果表明亚泊松特性明显依赖于光子增加数目m.     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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