烃类气体的智能识别

使用十一个不同型号的金属氧化物半导体气体传感器组成传感器阵列，分别用主成份分析法（ＰＣＡ）和偏最小二乘回归方法（ＰＬＳ）处理传感器阵列对一定浓度范围（约７００×１０－６～１４０００×１０－６）的甲烷、乙烷、丙烷、丙烯４种气体的响应．主成份分析法的结果可用来识别未知的烃类气体，偏最小二乘回归得到的较正模型具有较强的预报能力，可用来预报未知烃类气体的类型．     

钼－桑色素配合物的极谱波研究与应用

在ｐＨ２．１的硫酸－２．９６×１０－６ｍｏｌ／Ｌ桑色素－０．１７２ｍｏｌ／Ｌ氯酸钾底液中，钼在－０．４３Ｖ（ＳＣＥ）有一灵敏的极谱催化波，可用于测定微量钼．线性范围１．０４×１０－９～２．５０×１０－８ｍｏｌ／Ｌ，检出限１．８８×１０－１０ｍｏｌ／Ｌ．　极谱催化波法直接应用于三氧化钨光谱标样中微量相的测定，方法简便，准确可靠。     

用气敏电极法测定焦化厂废水中氨

研究了用气敏电极测定焦化厂废水中氨的分析方法，对测定的线性范围、响应时间、回收率、干扰物质等作了理论探讨和大量试验。在ｐＨ为１１．５～１４．０时，线性范围为１．００×１０－５ｍｏｌ／Ｌ～１．００×１０－１ｍｏｌ／Ｌ，最低检出限为５．０×１０－６ｍｏｌ／Ｌ，ＲＳＤ不大于２．５％。     

用荧光法测定蔬菜中的微量抗坏血酸

对抗坏血酸增强钙黄绿素－ＣＵ（Ⅱ）－ＮＨ４ＳＣＮ体系荧光强度进行了研究．结果表明：在实验条件下，抗坏血酸的浓度在１．０×１０－６～８．０×１０－６ｍｏｌ／Ｌ范围内与体系的荧光强度有良好的线性关系，检测限为１．０×１０－６ｍｏｌ／Ｌ．方法已用于测定蔬菜样品中的微量抗坏血酸．     

铜在8－羟基喹啉修饰铅笔芯电极上的伏安特性

本文用８－羟基喹啉修饰的铅笔芯电极研究了铜的阶梯阳极溶出伏安特性，并将此法用于人发中微量铜的测定。实验指出，在此修饰电极上，铜的阶梯溶出峰有两个，１＃峰电位在－０．０３Ｖ，２＃峰电位在０．２７Ｖ处。同样的试液和条件下，１＃峰总比２＃峰的峰电流大。实验研究了测定铜的最佳条件，并测得铜的浓度在４．０×１０－８～１．６×１０－６ｍｏｌ·Ｌ－１范围内，１＃峰的峰高与浓度呈良好的线性关系，最低检测限为２×１０－８ｍｏｌ·Ｌ－１。２＃峰高与铜的浓度在６．０×１０－８～１．６×１０－６ｍｏｌ·Ｌ－１范围内也有较好的线性关系，也可用于测定铜。本文还分析了铜在修饰电极上的反应机理     

硫氮氧杂大环汞修饰电极的研究

利用合成的新型硫氮氧杂大环化合物为载体制备了ＰＶＣ膜汞（Ⅱ）修饰电极．该电极对汞（Ⅱ）的线性响应范围为８×１０－６～６×１０－３ｍｏｌ·ｌ－１，对大多数金属离子的选择性系数小于１×１０－３．还研究了修饰电极的各种性能，讨论了修饰电极的响应机理，并将修饰电极应用于直接电位法和电位滴定法的测定中．     

胶束增敏荧光光度法测定苯甲酸雌二醇的研究

本文报道了高灵敏度荧光增效法测定苯甲酸雌二醇（ＥＢ）的新方法。在表面活性剂溴化十六烷基三甲铵（ＣＴＭＡＢ）存在下，测定下限为４．０×１０－９ｍｏｌ·Ｌ－１，线性范围为４．２×１０－９～３．８×１０－６ｍｏｌ·Ｌ－１。本法应用于样品中苯甲酸雌二醇的测定，结果满意。     

用示差脉法同时测定邻苯二酚与对苯二酚的研究

本文介绍用示差脉冲伏安法（ＤＰＶ）采用自制的碳糊电极同时测定邻苯二酚与对苯二酚的方法．邻苯二酚与对苯二酚两者在１×１０－６～１×１０－４ｍｏｌ／Ｌｍｏｌ／Ｌ浓度范围内与它们的还原峰电流ｉｐ有良好的线性关系，检测下限为１×１０－６ｍｏｌ／Ｌ两者还原峰电位Ｅｐ分开约１４０ｍＶ，可互不干扰．     

胶束增敏荧光光度法测定甲氧氯普胺的研究

本文用荧光光度法对酸性介质中甲氧氯普胺和十二烷基硫酸钠形成的胶束配合物的性能进行了系统研究。利用胶束的增敏增稳作用，提出了测定甲氧氯普胺的荧光光度新方法。本法线性范围宽，为１．３×１０－８～８．０×１０－６ｍｏｌ·Ｌ－１，灵敏度高，检出限为１．２×１０－８ｍｏｌ·Ｌ－１。应用本法于样品中甲氧氯普胺的测定，平均回收率为９８．８％，结果令人满意。     

L—酪氨酸—高锰酸钾—过氧化氢流动注射化学发光体系的研究

采用流动注射技术研究了Ｌ－酪氨酸－高锰酸钾－过氧化氢体系的化学发光行为，对影响化学发光强度的诸因素进行了实验和探讨．建立了化学发光法测定Ｌ－酪氨酸的新方法．方法的检出限为３．８×１０－７ｇ／ｍＬ，线性范围为１．０×１０－６～１．０×１０－４ｇ／ｍＬ．对合成试样中的三种浓度的Ｌ－酪氨酸测定的回收率在９７％～１０５％之间，相对标准偏差小于３％．     

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