液态一氧化碳与液氮混合物的物态方程

采用改进的液体微扰变分统计理论和van der Waals分子混合物的等效单组分流体模型,计算了压力在9～49GPa范围内1：1,4：1和1：4摩尔比的液态CO-N2混合物的高压物态方程．在计算过程中考虑了体系的热力学平衡,化学平衡以及相平衡．结果表明,CO：N2为1：1的理论计算结果与实验数据吻合较好;不同比例的混合体系在压力区间为20～30和30—49GPa范围内,Hugoniot曲线逐渐趋于软化,这意味着该混合体系在20和30GPa压力点附近分别经历了结构性相变．在极端条件下该混合体系中液态CO与N2发生了复杂的化学反应．冲击压缩产物形成时吸收了部分系统能量,导致了体系的冲击温度和冲击压力有所降低．随着N2初始组分的增加,Hugoniot曲线向上平移,其中CO：N2为1：1摩尔比时其Hugoniot曲线居于1：4和4：1两者之间,表明Lorentz-Berthelor组合规则在计算液态CO—N2混合物的高压物态方程时是有效的．     

非理想等离子体电子密度理论模型研究

分别用Saha方程和SHM模型计算了冲击压缩产生的温度T为～2.0eV,密度ρ为0.01g/cm3～0.05g/cm3非理想Ar等离子体的电子密度,并对计算的结果做了比较,探讨了适用于计算非理想等离子体电子密度的理论模型.     

一个通用的类氩流体物态方程

为了更好地研究类氩流体的性质,采用理论推导和数值计算方法,通过修正van der Waals方程,加入了影响因子和另外一个参数,提出了一个通用的物态方程。包含了几个已知的物态方程,通过对参数的选择,给出了较好的相图。结果表明:对于类氩流体,由此物态方程所给出的理论结果与实验符合得很好。该研究对于研究类氩流体的一级相变具有一定的参考价值。     

高温高密度氦流体物态方程

用二级轻气炮作为冲击压缩加载手段和多通道瞬态辐射高温计作为主要测量工具, 测量了冲击压缩下氦气(初始温度293 K, 初始压力为0.6, 1.2和5.0 MPa)的Hugoniot曲线和高达15000 K的冲击温度. 发现用Saha方程和Debye- Hückel修正模型计算初始压力为5 MPa的氦气物态方程与实验数据有较好的符合程度. 理论计算的氦气(初始压力P₀ = 5.0 MPa, 初始温度T₀ = 293 K)在低压条件下冲击波速度与粒子速度关系D = C₀ + λu (u<10 km/s, λ = 1.32)与Nellis液氦实验数据拟合的D-u曲线近似平行(λ = 1.36), 这表明氦流体的Hugoniot参数λ不依赖于初始密度ρ₀;当冲击温度约大于18000 K(冲击压缩氦气电离度达到10^-3量级)后, 气氦D-u曲线很快过渡到λ = 1.2另外一条曲线, 达到了压缩氦气的极限值.     

等离子体电子温度的光谱计算

文章介绍了在满足局部热力学平衡条件下测定等离子体电子温度的谱线绝对强度法、双谱线法、多谱线斜率法、双示宗元素等电子谱线法、Saha法等多种发射光谱法,并探讨了这些方法在等离子体电子温度诊断中的应用,旨在为实际电子温度的计算过程中选择合适的等离子体诊断方法提供参考.     

二元Lenard-Jones流体混合物的桥函数

衡量桥函数近似准确程度的重要标志是其计算出的热力学量能否较好地满足热力学自恰性,本文提出了一个新的用于研究二元Lenard—Jones流体热力学性质的桥函数,该桥函数的函数形式采用修正Verlet桥函数形式,其宗量为间接相关函数与含密度和温度及浓度的微扰势之差,在高于临界温度的区域（约化温度从1．5到5、约化密度从0．01到0．89）,对三不同的浓度（摩耳分数分别为0．125,0．5,0．875）分别用维里方程和压缩率方程计算了二元Lenard—Jones流体混合物的约化压强,计算结果表明,利用本文提出的桥函数计算得到的结果具有良好的热力学自恰性．通过引入含密度和温度及浓度的微扰势可以改善计算结果的热力学自恰性,从而提高计算其他热力学量的准确性．     

转换温度中Berthelot物态方程内压强项温度指数的修正

设定Berthelot实际气体物态方程内压强项中待定的温度指数参数为α,根据热力学理论推导出具有温度指数参数的Berthelot实际气体转换温度与压强的函数关系式,应用计算机MATLAB模拟仿真技术绘制反转曲线,将其与气体实验反转曲线进行对比,确定两者拟合情况较好时的指数修正参数,得到修正后的Berthelot实际气体物态方程。修正后的Berthelot实际气体物态方程在描述气体通过节流手段获得低温时更贴近气体的实验行为,在节流制冷工艺流程中具有更强的使用价值和理论指导意义。     

L-J流体扩散系数的分子动力学模拟

采用分子动力学(MD)模拟的方法,计算了模型流体氩及氩／氪溶液的自扩散系数和互扩散系数．计算结果表明,对不同状态下氩的自扩散系数的计算与实验结果符合较好,误差在10％左右;采用Green-Kubo法和Einstein法计算的扩散系数相等．氩／氪溶液的理想性较好,由径向分布函数计算得到热力学因子Q的数值为1．03。     

转换温度中Berthelot物态方程内压强项温度指数的修正

设定Berthelot实际气体物态方程内压强项中待定的温度指数参数为α,根据热力学理论推导出具有温度指数参数的Berthelot实际气体转换温度与压强的函数关系式,应用计算机MATLAB模拟仿真技术绘制反转曲线,将其与气体实验反转曲线进行对比,确定两者拟合情况较好时的指数修正参数,得到修正后的Berthelot实际气体物态方程.修正后的Berthelot实际气体物态方程在描述气体通过节流手段获得低温时更贴近气体的实验行为,在节流制冷工艺流程中具有更强的使用价值和理论指导意义.     

液H2O冲击压缩特性的理论计算

用修正的WCA状态方程和Ross变分微扰理论计算了液H2O冲击压缩曲线,在计算体系分子间相互作用势时,选择了EXP-6有效两体势模型;而液H2O势参数的选取较之相关作者研究的取值较为合理．计算结果表明,冲击Hugoniot曲线和温度的关系与Mitchell和Nellis以及Lyzenga等的实验数据符合较好。     

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     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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