测定高压气体溶解度的装置

建立了一套测定高压下气体在液体中溶解度的装置,该装置具有以下特点：气液相可充分混合,平衡釜通过底部活塞加压,最高测定压力可达40．0 MPa,液相在体系循环状态下取样可避免物系的二次平衡,体系死体积较小,装置恒温槽的控温精度较高(±0．1℃)．利用此装置测定了温度为298．15 K、303．15 K和压力2．0～12．0 MPa下甲烷在正己烷中的溶解度数据并与文献值相比较,从实验数据的精度和重复性考察了实验装置的可靠性,实验值和文献值的相对误差均小于2．5%,同时根据Kricheveky-Kasarnovsky(K-K)方程提出了一种从高压实验数据回归常压实验数据的方法．     

单片机在精密机床油温控制系统中的应用

精密机床温度控制技术是实现精密加工技术的一项长远的基础性研究．用恒温油液喷淋机床是减小精密机床热变形、提高热稳定性和改善零件加工精度的途径．为了得到恒温油液，作者对机床油液恒温控制进行了研究，建立了用模糊控制器的单片机温度控制系统，其温控精度可达到±０．２℃．     

“溶液吸附法测定固体比表面”实验的改进

确定了新的实验条件：粒状活性炭研磨至１００－３００目；７０．０℃恒温振荡１ｈ后，于室温振荡２ｈ；初始浓度范围２．１０－３．００ｍｍｏｌ．Ｌ＾－１。     

圆盘塔二氧化碳吸收实验装置的改造

简述了专业实验改造的重要性．经过多年的观测,分析了原有实验流程的不足,提出了流程改造的依据、方法和新流程的适应场合．多年的运行结果表明,该装置的恒温效果较好,大大地缩短了实验时间,实验精度大有提高．     

啤酒发酵微机测控系统

首先分析温度、压力对发酵过程的影响，然后根据发酵工艺曲线及发展规划提出控制方案，并加以实施．整个测控系统实测指标：测量精度为温度±０．１℃，压力±０．５％，液位±０．５％；控制精度为温度±０．３℃，压力±０．６％．     

计算机辅助恒温量热反应器

研制了计算机辅助恒温量热聚合反应器，体积为２５０ｍｌ，设计最高压力为１ＭＰａ，使用温度范围为２７３～３５３Ｋ，反应温度控制精度为±０．０５Ｋ。实验数据由计算机实时处理。本反应器测得的苯乙烯乳液聚合反应速率及转化率与称重法获得结果吻合。结果表明，本反应器系统对反应热效应响应灵敏，最大滞后时间小于１０ｓ，适用于常规的聚合反应及其他化学反应的动力学研究和过程跟踪     

热学实验中的控温计时装置

介绍一种可以在热学实验系统中进行温度测量、控制和时间记录的实验装置的结构和工作原理。使用该装置可以非常方便地控制、测量热学系统的温度，其所测温度读数精度可达0．01℃。同时，又可以方便地记录系统加热过程所用的时间。由此，可以准确地计量热力学系统的热量变化，使实验结果精度提高。     

制备氢气及测定铜原子量的微型实验探讨

研制了制备氢气及测定铜原子量的微型实验装置．该实验装置与常规实验装置相比较，具有节约仪器和药品费用，减少污染，安全、省时等优点．测定铜原子量的相对误差在±０７％以内．可供基础无机化学实验和普通化学实验教学使用．     

测量轴承摩擦力矩的实验装置及其精度

介绍一种能够精确测量轴承摩擦力矩的实验装置的结构，实验方法，数据处理公式及误差分析等，该装置测量精度高，重复性好，摩擦力矩和轴承载荷的测量误差〈０．３％，偏心矩测量精度０．１μｍ，偏位角误差也很小。     

H2O2分解活化能的测控仪器及装置

介绍了H2O2分解反应活化能的测控仪器及装置,对装置的反应容器、加热控制、搅拌及数据计量四个部分进行了重新设计和改进。新的测控装置用于学生实验,实践表明：装置小型简单,升温快（4．5℃／min）,恒温灵敏度较高（±0.2℃）,3．5h内测定3个温度下分解速率常数的所需数据,数据量增加数倍,通过阿累尼乌斯方程进一步处理,得到H2O2分解反应的活化能（64．9kJ／mol）．本实验装置在一个学期的学生实验实际应用中取得了很好的教学效果。     

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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