超临界CO2的溶剂特性对脂肪酶催化反应的影响

分别用溶解度参数和介电常数表征超临界流体的溶剂特性，并计算了不同压力下二氧化碳的溶解度参数和介电常数。测定了不同压力下脂肪酶催化月桂酸和正丁醇酯化反应的最大反应速率和米氏常数，研究了溶解度参数δ和介电常数ε对最大反应速率Ｖｍ的影响，并比较好地进行了关联：ｌｎ［Ｖｍａｘ／（ｍｍｏｌｈ－１ｇ－１）］＝４．４６５－０．１５３（δ／ＭＰａ０．５），ｌｎ［Ｖｍａｘ／（ｍｍｏｌｈ－１ｇ－１）］＝４．１８７－８．３１８（ε－１）／（ε＋１）．从而通过溶剂特性将压力这一操作条件直接与反应动力学相联系。     

生物降解材料聚乙醇酸的相容性参数

目的:测定聚乙醇酸的三维溶解度参数、聚乙醇酸与其他溶剂间的相互作用参数和溶度参数距离.方法:采用溶解度法考察聚乙醇酸在溶剂中的溶解性能,为获得准确的物性数据,使用36种溶剂进行实验研究.根据溶解结果,用优化法计算了聚乙醇酸的三维溶解度参数,获得了聚乙醇酸和36种溶剂之间的相互作用参数和溶度参数距离.结果:三维溶解度参数的色散力分量δ_d、极性力分量δ_p、氢键力分量δ_h和总溶解度参数δ值分别为:17.35、8.66、9.87、21.76(MPa)~(1/2),聚乙醇酸和36种溶剂之间的相互作用参数和溶度参数距离列在正文表中.结论:相互作用参数结果与Flory-Huggins高分子溶液理论的互溶标准完全一致,说明优化法获得的三维溶解度参数是准确可信的.     

反相色谱法研究聚醚的溶解度参数

用反相色谱法研究了聚环氧乙烷、聚环氧丙烷和聚四氢呋喃的溶解度参数，按Ｇｕｉｌｌｅｔ的方法得到１２０℃时的溶解度参数分别为８．９３、８．２７和８．２１（ｃａｌ／ｃｍ＾３）１／２本文讨论了方法的准确性和合理性，并用二元溶解度参数公式代替Ｈｉｌｄｅｂｒａｎｄ公式对实验结果进行处理，得到了聚醚溶解度参数的非极性部分，它们分别为６．４４、７．１５和７．５３（ｃａｌ／ｃｍ＾３）＾１／２。     

B值鞅差阵列强大数定律的收敛速度

设Ｂ是ｐ阶一致光滑空间，１〈ｐ≤２，Ｘ＝｛Ｘｎｋ，Ｆｎｋ，１≤ｋ≤ｎ，ｎ≥１｝是Ｂ值鞅差阵列且对非负实值随机为量Ｙ尾概率一致有界，若存在α≥１，δ〉０，α〈ｐ＋δ（ｐ－１），使（Ｙ〉ｘ）－１／ｘ＾ａ＋δ（ｘ→∞），则对任意的ε〉０，都有＾∞∑ｎ＝１ ｎ＾ａ－２Ｐ（‖Ｓｎｎ／ｎ‖≥ε）〈∞。其中Ｓｎｎ＝＾ｎ∑Ｋ＝１ Ｘｎｋ（ｎ≥１）。     

Fe(Phen)_3(ClO_4)_2H_2O在甲醇 - 水混合溶剂中的溶解度

在２８３．１５～３１８．１５Ｋ（间隔５Ｋ）下,用光度法测定了离子缔合物Ｆｅ（Ｐｈｅｎ）３（ＣｌＯ４）２Ｈ２Ｏ（简写为ＦＰＣ,以下同）在水及甲醇—水混合溶剂中的溶解度．经微机曲线拟合给出溶解度Ｓ随温度Ｔ及甲醇质量百分比浓度Ｗｔ％的经验关系ｌｇＳ＝１．９５８＋１．３０５×１０－２Ｗｔ％－（１５０３．４＋３．０８５×１０－２Ｗｔ％）／Ｔ．用溶剂结构理论对ＦＰＣ溶解度的变化规律进行讨论．     

酞酸酯正辛醇／水分配系数和水溶解度的测定及其相关性研究

系统研究测定了九种常见邻苯二甲酸酯类化合物的正辛醇／水分配系数和水溶解度，考察了正辛醇／水分配系数测定值Ｋ与分子碎片数法计算值Ｋ、一阶价分子连接性指数１ｘｒ以及水溶解度Ｓ之间的相关性，结果表明．ｌｏｇＫ与Ｋ、１ｘｒ及Ｓ呈良好线性关系，并建立了相关方程式。     

meso-四-(4-甲氧基苯基)卟啉的晶体和分子结构

用Ｘ—射线测定了ｍｅｓｏ－四（４－甲氧基苯基）卟啉的溶剂合物（ＴＰＭＰ·ＣＨＣｌ３）的晶体结构。实验表明，该晶体属单斜晶系，空间群Ｐ２１／Ｃ，ａ＝１．４３７７（２）ｎｍ，ｂ＝０．９６７４（７）ｎｍ，ｃ＝１．５６８８（４）ｎｍ，β＝１０１．００（２）°，Ｖ＝２．１４２ｎｍ３，Ｚ＝２，ｄｃ＝１．３２４ｇ／ｃｍ３，μ＝２．６１３ｃｍ－１，Ｆ（０００）＝４４４。讨论了分子结构中的非平面共轭效应及卟啉环与锰（Ⅲ）离子配位后锰（Ⅲ）对其结构参数的影响。     

单糖-NaCl的相互作用与糖的立体化学的关系

前文报道了用离子选择性电极（ＩＳＥ）测定糖－电解质－水三元系的活度系数的新方法［１］．本文运用此方法研究了一些单糖（Ｄ－葡萄糖,Ｄ－半乳糖,Ｄ－木糖,Ｄ－阿拉伯糖）与ＮａＣｌ在水中的活度系数及其相互作用的自由能参数．所得结果列于表１．表１　单糖和ＮａＣｌ在水中的相互作用参数ａ（２９８．１５Ｋ）Ｃ１／１０－２Ｃ２／１０－２Ｃ３／１０－２Ｃ４／１０－２Ｃ５／１０－２Ｃ６／１０－２δｂＲｃＧｌｕｃｏｓｅ９．０５４－７．９８５－０．７０９７３．７５５０．２８８６０．０３２３３０．００２１０．９９８Ｇａｌ…     

催化光度法测定痕量银Ag(I)-α,α''-Dipy-K_2S_2O_8-ECR体系

用光度法研究了Ａｇ（Ⅰ）－α，α’－ＤｉＰｙ．－Ｋ２Ｓ３Ｏ８－ＥＣＲ催化体系．确定了最佳测定条件为：３．０×１０－３Ｍα，α’－Ｄｉｐｙ，３．８×１０－２Ｍ Ｋ２Ｓ３Ｏ８，１．２Ｘ１０－４Ｍ ＥＣＲ和ｐＨ５．０．方法灵敏，其检测限为１× １０－９ｇ／ｍｌ．本法用于测定氯化银溶度积，经果与文献值相符．     

Xanthobacter autotrophicus产生聚-β-羟基烷酸的显微观察研究

利用光学显微镜和透射电镜，研究了Ｘａｎｔｈｏｂａｃｔｅｒａｕｔｏｔｒｏｐｈｉｃｕｓ在发酵中聚－β－羟基烷酸的积累过程及超微结构．得到聚－β－羟基烷酸的最高含量为６２．７０％（Ｗ／ＤＷ）．其中聚－β－羟基丁酸与聚－β－羟基戊酸的比例为１．０∶２．６     

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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