Wal4cka模型中热介质里的介子屏蔽质量

根据热场动力学计算了Ｗａｌｅｃｋａ模型中σ、ω介子屏蔽质量的温度和密度依赖性。文章考察了真空涨落效应，结果发现真空涨落非常重要并且它将导致在热密介质中ω介子质量的减小以及σ介子质量的增加。     

量子强子动力学（QHD—Ⅱ）模型中核子的真空涨落对ρ介子质量的影响

利用热场动力学和量子强子动力学（QHD－Ⅱ）模型,计算了ρ介子的有效质量和屏蔽质量与密度的依赖关系,考察了由核子有效质量引起的真空涨落效应,证实了核子的真空涨落对ρ介子的自能修正很重要,它将导致在热密物质中ρ介子的质量减小,还比较了QHD－Ⅱ模型和矢量－张量耦合模型,得出了在核子－核子－ρ介子的相互作用中,张量耦合对解释最近的实验结果很重要。     

σ,ε色散关系中的ρ°—ω混合效应

用标准σ－ω混合方法所构造的介子介电函数，计算了核物质中σ，ω介子的集体激发能谱，并考虑ρ°－ω混合对色散关系的影响很小。     

σ，ω色散关系中的ρ°－ω混合效应

用标准σ－ω混合方法所构造的介子介电函数，计算了核物质中σ，ω介子的集体激发能谱（或色散关系），并考虑ρ°－ω混合的效应，结果表明ρ°－ω混合对色散关系的影响很小。     

相对论平均场理论关于赝自旋对称性的研究(英文)

相对论平均场理论被应用于检查208Pb的赝自旋对称性.通过相对论平均场计算提取的赝自旋伙伴态的波函数劈裂,研究不同介子场和光子场对赝自旋对称性的影响.结果表明:赝自旋波函数劈裂随着σ介子场强度的增加而增大,随着ω介子场强度的增加而减小.相比于σ和ω介子场,ρ介子场和光子场仅对赝自旋劈裂起着微弱的影响,σ和ω介子场对赝自旋对称性起主导作用,赝自旋劈裂主要来源于σ和ω介子场的竞争.     

奇异介子对前身中子星转动惯量的影响

本文利用相对论平均场理论并考虑重子八重态{n,p,Λ,∑－,∑0,∑+,Ξ－,Ξ0},研究了σ*,φ介子对前身中子星转动惯量的影响. 研究发现：考虑到σ*,φ介子的贡献,σ0,ω0,ρ0介子的势场强度以及中子和电子的化学势都明显降低了.同时还发现,与不考虑σ*,φ介子的贡献时相比,前身中子星质量的最大值和转动惯量的最大值也都降低了,并且前者的减小量大于后者的减小量.     

相对论离壳光学势的研究

基于相对论性核子-介子模型,导出了考虑σ、ω介子交换的离壳光学势虚部公式,并利用色散关系讨论了对实部的修正。这些结果可用于有效质量的计算和对光学势行为的分析。     

有限温度和化学势下σ、π介子的质量

利用一种重新求和方案,在N_f=2的NJL模型框架下,研究了标量σ介子、赝标量π介子的热质量.计算表明,随着温度的升高,σ介子的质量先下降,然后升高;π介子的质量一直随温度升高而增加.两种介子在温度约为0.2GeV时质量发生简并,这是手征对称性恢复的信号.π介子质量的连续变化表明相变是二阶的.化学势的提高对不同介子的质量的影响是不同的,且使手征对称性恢复提前.计算结果与其他有效模型的预言定性一致.     

核子耦合参数对中子星中超子相的影响

中子星中超子的出现以及超子的比例对中子星的性质具有重要影响,不同的核子相互作用模型如何影响中子星中的超子是一个重要物理问题.从相对论平均场理论出发,选取不同核子耦合参数,计算了中子星中超子的数密度,发现不同类核子耦合参数对中子星中超子出现和中子星向超子星转变的转变密度有不同影响,而且核子相互作用的σ介子势和ω介子势影响显著,而ρ介子势影响较小.这些结果对大质量中子星性质的理论研究具有重要参考价值.     

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。     

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