傅立叶红外光谱仪测定水中总油

研究了水中总油的红外光谱测定方法．在pH≤2的条件下，四氯化碳直接萃取水中的总油，以四氯化碳为参比，测量萃取液在2930cm^-1、2960cm^-1、3030cm^-1处的吸光度，进行定量．方法快捷准确，精密度好，回收率高，能直接应用于饮用水源水中总油的检测，结果令人满意．     

热固性酚醛树脂合成方法的改进

热固性酚醛树脂是热敏版材的两种成膜树脂之一，其结构性能直接影响到和线性酚醛树脂在热和酸的作用下交联的速度和程度，从而影响版材的灵敏度和成像质量．为了减少或除去残留在树脂中碱性催化剂、提高树脂的分子量及羟基含量，改进了原有的合成方法．新方法中把反应分为两个阶段：低温阶段是形成羟基的阶段，高温阶段是缩聚阶段，此阶段决定树脂分子量的大小，再通过酸碱中和除去树脂中作为催化剂的碱．实验结果显示，改进方法后合成的新树脂在实验室小版实验中取得了明显的效果，版材的灵敏度及成像质量都比原来有了明显的提高．     

大熊猫肌肉肌酸激酶的纯化与性质

用改进的Ｋｕｂｙ等人方法从大熊猫骨骼肌中纯化了肌酸激酶，并对此酶的某些性质进行了研究。纯化倍数为 ３５．７；收率１７．３％；比活力为 ５５．３Ｕ／ｍｇ；等电点为 ６．６０。聚丙烯酰胺凝胶电泳鉴定为一条带。ＳＤＳ聚丙烯酰胺凝胶电泳测得其亚基分子量为４２ ０００，总分子量为 ８４ ０００，该酶是由两个相同亚基组成的二聚体。酶对肌酸的Ｋｍ 为 ５．２６ｍｍｏｌ／Ｌ；对ＡＴＰ的 Ｋｍ为 ０．７４ｍｍｏｌ／Ｌ，酶的最适温度是 ３０～３６℃；酶的最适ｐＨ大于８．０。     

蛋白质氨基酸的组合问题

试题Ｂ要求参赛者建立数学模型，测定已给定分子量的某一蛋白质的氨基酸组成．本文建模的思想是：充分利用所给１８种氨基酸分子量间的内部联系，建立变量个数最少的实用模型，以缩短运算时间和缩小解的范围．本文建立在最一般模型及其简化基础上的Ａ、Ｂ两个实用模型达到了上述要求，取得了满意的效果，且对实验室有无微机均能适用．文章最后对模型的优缺点进行了分析，提出了改进方向．     

聚氯乙烯分子量与性能关系研究

测定了不同聚合度聚氯乙烯分子量和溶度参数，对其力学性能进行了研究，聚合物分子量对溶度参数不产生影响．随分子量增加，聚合物的冲击强度、断裂强度和断裂伸长率都随之增加，曲服强度下降，聚合物分子量为１．６×１０５时，力学性能变化出现转折点．在高分子量时，ＰＶＣ呈现出热塑弹性体特征，这是由于分子构象熵增加和分子链缠结造成的．     

对乙酰氨基苯磺酰氯的合成工艺改进

以苯胺为母体，合成了对乙酰氨基苯磺酰氯。在氯磺化反应中引入了四氯化碳溶剂，在反应后期加入氯化钠。用正交实验确定了最佳原料配比：n（乙酰苯胺）：n（氯磺酸）：n（氯化钠）＝1．0：4．3：0．4。改进工艺后，氯磺化反应的收率由80％提高到86．73％。     

聚酯型光致抗蚀剂合成方法的探讨

为了提高聚酯型光致抗蚀剂质量,我们通过合成方法的改进,结合凝胶色谱法测定产品的分子量分布,认为产品的分子量大小和分子量分布取决于所采用的合成方法,从而直接影响光刻胶质量。改进后的合成方法,在常压下可进行反应,降底了反应温度,大大缩短反应时间,並易于控制分子量大小,制得了分子量分布较窄而对称的产品。     

甜菜高分子量核DNA的分离

研究了从甜菜中分离高分子量核DNA的方法．利用离心分离细胞核，经低融点琼脂糖块包埋、蛋白酶K原位裂解，结合低融点琼脂糖脉冲电泳去除淀粉制备高分子量核DNA．结果表明利用幼叶制备高分子量核DNA分子量高，更容易去除其中的淀粉；并且利用该方法得到的高分子量核DNA纯度高，适于部分酶切．     

侧链聚丙烯酸酯液晶聚合物的合成

对比了用引发剂引发和采取钴γ源辐射引发使单体聚合的方法，成功地制备了一种侧链聚丙烯酸酯高分子液晶－聚（（丙烯酸乙氧基酯）苯甲酸甲氧基苯酯）．通过钴γ源辐射引发的方法可获得分子量分布窄的目标聚合物，且分子量便于控制．对单体合成的方法和条件进行了详细的介绍．采用了ＤＳＣ，ＩＲ，ＧＰＣ，偏光显微镜等手段对中间产物和目标聚合物进行了分析和表征．     

牛摩拉氏菌溶血素基因克隆的探讨

应用分子遗传学方法，以光敏生物素标记的ＤＮＡ探讨针进行分子杂交等手段克隆了牛摩拉氏菌溶血素结构基因，并在大肠杆菌中得到表达，其重组子定名为ＭＲ９，分子量为６．４５Ｋｂ，外源片段分子量为３．８Ｋｂ?     

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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