STN液晶中间体的合成

综述了三种ＳＴＮ液晶中间体的合成方法，并较详细地介绍了作者合成烷基苯乙酮、烷基苯甲酸和烷基环己基甲酸的实验方法及结论．三种中间体经高纯处理用测定沸点、熔点、质谱、红外光谱、元素分析等方法确定了结构，并用色谱测定了产品纯度     

烷基苯的沸点与分子结构之间定量关系的探讨

本文用图论方法探讨了烷基苯的沸点与其分子结构之间的关系，提出了一个既能合理表征烷基沸点与分子结构关系，又能准确预测沸点的定量关系式，计算结果表明，烷基苯沸点计算值都很按近实验值，平均误差０．０５％。     

多聚磷酸催化对乙基月桂苯酮合成及其结构鉴定

苯酮是三次采油用烷基苯磺酸盐表面活性剂的重要中间体,传统的三氯化铝作催化剂活性较高,使得副产物多难以分离．采用多聚磷酸代替三氯化铝作温和的催化剂合成了对乙基月桂苯酮,取得了很好的结果,精制产品的气相色谱纯度达93％以上．给出了产品的熔点和沸点数据,通过红外、核磁共振波谱等分析手段证明其结构正确,气质联用证明相对分子质量相吻合,并推断了多聚磷酸Friedel-Crafts酰化反应均机理。     

配位不饱和铁—邻菲罗啉（2,2‘—联吡啶）配合物对烷基？…

以铁－邻菲罗啉及铁－２,２′－联吡啶配合物为催化剂,常压氧气为氧化剂,在１１０℃对乙基苯、正丙苯、１正丁苯及对二甲苯等烷基苯进行氧化,得到了相应的酮和醇;讨论了温度、底物与催化剂物质的量之比及烷基苯侧链对催化剂催化性能的影响。     

配位不饱和铁-邻菲啰啉(2,2'-联吡啶)配合物对烷基苯的催化氧化

以铁-邻菲啰啉及铁-2,2'-联吡啶配合物为催化剂,常压氧气为氧化剂,在110℃对乙基苯、正丙苯、正丁苯及对二甲苯等烷基苯进行氧化,得到了相应的酮和醇;讨论了温度、底物与催化剂物质的量之比及烷基苯侧链对催化剂催化性能的影响.     

配位不饱和铁邻菲啉(2,2′-联吡啶)配合物对烷基苯的催化氧化

以铁 邻菲啉及铁 2 ,2′ 联吡啶配合物为催化剂 ,常压氧气为氧化剂 ,在 110℃对乙基苯、正丙苯、正丁苯及对二甲苯等烷基苯进行氧化 ,得到了相应的酮和醇 ;讨论了温度、底物与催化剂物质的量之比及烷基苯侧链对催化剂催化性能的影响 .     

2—烷基苯并咪唑的合成及结构特征

以邻苯二胺与脂肪酸为原料，合成２－烷基苯并咪唑，通过选择反应体系，温度，时间和催化剂，获得一条满意的合成工艺路线，并通过熔点测定，红外光谱，质谱等方法，对产物进行结构表征。     

2-烷基苯并咪唑的合成及结构表征

以邻苯二胺与脂肪酸为原料，合成２－烷基苯并咪唑。通过选择反应体系、温度、时间和催化剂，获得一条较满意的合成工艺路线，并通过熔点测定、红外光谱、质谱等方法，对产物进行结构表征。     

一氧化氮与有机底物反应的研究概述

NO是一个双原子无机小分子,也是一个自由基分子,分子量为30,室温下是无色气体,其液态、固态均为无色,沸点-151.8℃,熔点-163.6℃。25℃,1.01×105Pa大气压条件下,在水中溶解度为1.8×     

链烷烃分子结构特征与熔点的变化关系

在分析链烷烃的分子结构特征基础上，根据分子热力学中的Lennard-Jones势能函数式，提出了链烷烃的熔点计算模型，以正癸烷和4种主链碳原子数分别为4、5、6、7的支链烷烃为模型化合物进行相关分析，得出模型方程，将其用于30种含碳原子数为2－31的直链烷烃和48种主链碳原子数为4－7的支链烷烃的熔点进行估算，平均绝对误差为4．70℃，平均相对误差为2．59％，其估算精度远优于已有的献报导。     

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     

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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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has