采用碳酸钾分离环己酮-水恒沸物

测定了40℃时环己酮-水-碳酸钾体系的液-液相平衡数据,用Pitzer理论和NRTL方程对液一液相平衡数据进行了关联计算,计算值与实测值吻合较好;考察了质量分数为60．0％碳酸钾水溶液与该恒沸物的质量比对脱水率的影响．结果表明：当碳酸钾水溶液与恒沸物的质量比为1．2时,碳酸钾的脱水率高达98．40％．     

吡啶-水-氟化钾体系的液液相平衡

采用氟化钾分离吡啶-水恒沸物体系．将氟化钾加入到吡啶-水体系中，可产生水富集相(水相)和吡啶富集相(吡啶相),实验测定了吡啶-水-氟化钾体系在25℃时的液液相平衡数据．当水相中氟化钾浓度分别大于或等于30．57％时，产生的吡啶相中含有可以忽略的盐，水相中含有可以忽略的吡啶；当水相中氟化钾浓度为50．40％时，吡啶相中吡啶的浓度高达93．84％．因此用氟化钾可以有效地分离吡啶-水体系．采用Pitzer方程计算水相中水的活度，用Wilson、NRTL或UNIQUAC方程计算吡啶相中水的活度，将二者结合对液液相平衡数据进行理论计算．结果表明，采用Pitzer方程与UNIQUAC方程结合的理论计算值与实验值吻合较好，其绝对平均偏差水相为1．01％，吡啶相为0．70％．     

丙酮-水-盐液-液相平衡数据的测定和关联

测定了丙酮-水-氟化钾及丙酮-水-碳酸钾体系在25℃的液-液相平衡数据,用Pitzer理论和Wilson方程对相平衡数据进行了关联计算,计算值与实验值符合良好,为工业上用盐分离丙酮,水体系提供了基础数据。     

丙烯腈-水-氟化钾及丙烯腈-水-碳酸钾体系的液-液相平衡

采用氟化钾或碳酸钾分离丙烯腈-水时,可产生水富集相(水相)和丙烯腈富集相(丙烯腈相).测定了丙烯腈-水-氟化钾、丙烯腈-水-碳酸钾体系在40℃时的液-液相平衡数据,用Pitzer理论和NRTL方程对液-液相平衡数据进行了理论计算.结果表明:产生的丙烯腈相中含有可以忽略的盐,水相中含有可以忽略的丙烯腈,因此用氟化钾或碳酸钾可以有效地分离丙烯腈-水体系;丙烯腈富集相的实验值与计算值接近,对丙烯腈-水-氟化钾体系绝对平均偏差为0.20%,对丙烯腈-水-碳酸钾体系绝对平均偏差为0.22%.     

仲丁醇-水-氟化钾及仲丁醇-水-碳酸钾体系的液-液相平衡

将氟化钾或碳酸钾加入到仲丁醇-水体系中时,可产生水富集相（水相）和仲丁醇富集相（仲丁醇相）．文中通过实验测定了仲丁醇-水-氟化钾、仲丁醇-水-碳酸钾体系在25℃时的液-液相平衡数据,发现当水相中氟化钾或碳酸钾含量分别大于或等于26．38％（质量分数,下同）或28．76％时产生的仲丁醇相中含有可以忽略的盐、水相中含有可以忽略的仲丁醇,因此用氟化钾或碳酸钾可以有效地分离仲丁醇-水体系．分别采用Pitzer方程和UNIQUAC方程计算水相和仲丁醇相中水的活度,将二者结合对液-液相平衡数据进行理论计算．理论计算值与实验值吻合较好,对仲丁醇-水-氟化钾体系实验值与计算值的绝对平均偏差水相为1．57％,有机相为0．33％;对仲丁醇-水-碳酸钾体系实验值与计算值的绝对平均偏差水相为1．40％,有机相为0．39％．     

1,3-丙二醇-甘油汽液相平衡数据的推算

针对由甘油,1,3-丙二醇组成的体系,推算其在低压下的汽液相平衡数据。利用UNIFAC基团贡献法计算液相活度系数。提供了该二元体系于lOOkPa,50kPa和lOkPa下的汽液相平衡数据。结果显示,两组分不会形成共沸物,而且系统压力越低,越利于它们的分离。     

乙二醇/正辛醇二元体系汽液相平衡数据的测定及关联

为了采用共沸精馏方法模拟分离乙二醇和1,2-丁二醇,用汽液平衡釜测定了30.4kPa条件下乙二醇-正辛醇二元体系的汽液相平衡数据,分别采用Wilson方程和NRTL方程对该汽液相平衡数据进行关联,并进行热力学一致性检验。结果表明实验数据符合热力学一致性,获得了的Wilson方程与NRTL方程参数,模型计算结果均与实验数据都吻合,可满足工程设计需要。     

辛烷—磷酸—水三元体系液—液相平衡

实验测定了不同温度下辛烷－磷酸－水二元体系和辛烷－磷酸－水三元体系液－液相平衡液－液相平衡数据。用5参数NRTL方程对液－液相平衡数据进行了关联，精度满足工程设计的要求。为共沸精馏塔的设计计算提供了理论依据。     

辛烷-磷酸-水三元体系液-液相平衡

实验测定了不同温度下辛烷-水二元体系和辛烷-磷酸-水三元体系的液-液相平衡数据.用5参数NRTL方程对液-液相平衡数据进行了关联,精度满足工程设计的要求.为共沸精馏塔的设计计算提供了理论依据.     

用碳酸钾分离甲乙酮-水的研究

测定了甲乙酮-碳酸钾体系在40℃时的液-液相平衡数据，用Pitzer理论和NPTL方程对液-液相平衡数据进行了关联计算，计算值与实验值符合良好，采用碳酸钾分离甲乙酮-水体系，碳酸钾的脱水率高达97.43%。     

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

正~~