磺化三聚氰胺甲醛树脂合成的磺化工艺及磺化结构分析

研究了羟甲基三聚氰胺磺化阶段的pH值、温度和时间对磺化反应的影响,并采用13C-NMR分析了磺化的化学结构.研究表明,在pH>11 5,温度为80～90℃和合适的时间内可以获得高磺化程度的三聚氰胺磺酸盐;在摩尔比F/M=4 0和S/M=1 0的反应体系中,磺化可同时发生在仲氮和叔氮原子上,两种结构之比约为2∶1.     

高磺化度SEPDM的制备及离聚体性能研究

研究了磺化度大于０．５ｍｏｌ／ｋｇ的磺化三元乙丙橡胶的制备及离聚体的加工和力学性能，讨论了磺化反应的影响因素，得到了优化的横化反应条件：ｎ（乙酸酐）：ｎ（浓硫酸）＝１：１，５℃下反应３０ｍｉｎ。硬脂酸锌是高磺化度ＳＰＤＭＺｎ离聚体的有效增塑剂，其质量分数为１０％－３０％时，可显著改善离聚体的加工性能。     

m-β-羟乙基砜硝基苯催化加氢制m-β-羟乙基砜苯胺

以Ｐｄ／Ｃ为催化剂,考察了温度、压力、溶剂、溶剂量、溶液ｐＨ值、搅拌速度及反应原料对ｍ－β－羟乙基砜硝基苯催化加氢制,ｍ－β－羟乙基苯胺的影响。表明以自制的ｗ＝０．０２Ｐｄ／Ｃ为经剂,经提纯的工厂中间体ｍ－β－羟乙基砜硝基苯为原料,在６５℃、３．５ＭＰａ、乙醇为溶剂、原料：乙醇：催化剂＝１：１：０．０５（ｍ／ｍ）、溶液ｐＨ值７～８、搅拌速度８００ｒ／ｍｉｈ的条件下反应２ｈ,反应得率可达９９．７％＾     

药物中硫酸新霉素含量测定的新分光光度法

文章报道了硫酸新霉素（ＮＭＳ）的分光光度法测定的新方法．基于在醋酸钠介质（ｐＨ＝７．５）中，室温下，硫酸新霉素与Ｃｕ２＋反应１０ｍｉｎ生成摩尔比为１∶１的蓝色配合物，在６４０ｎｍ处有最大吸收．这个方法的线型范围为０．２～２．０ｍｇ／ｍｌ，ｒ＝０．９９９７，检测限为０．０２ｍｇ／ｍｌ，变异系数为２．４％（ｎ＝１０）．用于硫酸新霉素制剂的测定，平均回收率为（９９．０±１．９）％（ｎ＝８）     

铝镁复合氢氧化物的合成研究

以硝酸铝、硝酸镁为原料,ＮａＯＨ 为沉淀剂,采用变化ｐＨ 值法,经过共沉淀水热合成了铝镁层状复合氢氧化物。详细测定了不同镁铝摩尔比混合盐溶液的碱滴定曲线,利用正交设计探讨各个主要因素在合成过程中的影响,借助ＸＲＤ鉴定合成物相结构。结果表明,当混合盐溶液中ｎ（Ｍｇ）／ｎ（Ａｌ）＝ １．０～１０．０ 时,在ｐＨ＝ ５．０～１０．０ 下,与ＮａＯＨ 共沉淀物经回流处理后,均能合成层状复合氢氧化物;最佳合成条件为：ｎ（Ｍｇ）／ｎ（Ａｌ）＝ １．０～６．０,ｐＨ＝ ８．０～９．０,１１０℃,３ ｈ 的水热处理。     

铜离子浮选的动力学

发现铜离子的浮选符合零级反应动力学，并求出其速度常数ｋ０。当ｐＨ一定时，ｋ０与流量Ｑａ成正比，即ｋ０＝ｍＱａ。在ｐＨ＝２～５的范围内，符合ｍ＝１．３７０×１０＾－５ｌｎ（ｐＨ／１．２２２）的关系。ｐＨ＝５时ｍ最大，ｐＨ＞５则下降，从而得出了ｋ０＝１．３７０×１０＾－５Ｑａｌｎ（ｐＨ／１．２２２）。从单泡吸附模型出发，从理论上提出了浮选效率（ηｆ）关系式，可用以评价表面活性剂的浮选效果及工艺条件如流     

Co－Sn替代钡铁氧体的制备及其磁性

用化学共沉淀工艺制备了可望用作高密度垂直磁记录介质的Ｃｏ－Ｓｎ替代钡铁氧体系列微软样品ＢａＦｅ＿（１２－２ｘ）Ｃｏ＿ｘＳｎ＿ｘＯ＿（１９），其中ｘ可取值为０，０．２，０．４，０．５，０．６，０．８，１．２．给出了最佳制备条件：反应温度ｔ＝８０℃，体系的ｐＨ值ｐＨ＝１１．８，热处理温度Ｔ＿ｈ＝９２５℃。对所制备的系列样品进行了透射电镜（ＴＥＭ）观测和ｘ光衍射（ＸＲＤ）测试，给出了颗粒的形貌和大小以及晶体结构和晶格常数。用振动样品磁强计（ＶＳＭ）对宏观磁性进行了测试，给出了宏观磁性与替代浓度关系。     

青霉素萃取工艺条件研究

对青霉素萃取理论模型进行研究,并作了大量的实验研究,发现传统的青霉素萃取工艺条件（ｐＨ＝ １．８～２．２,温度为５ ℃,相比ＶＯ／ＶＷ ＝ １／２～１／２．５,采用两级萃取）不是最佳的。提出了新的萃取操作工艺条件,即ｐＨ＝ ３．０±０．２,温度为常温２０ ℃,相比ＶＯ／ＶＷ ＝ １／３～１／４,并采用三级萃取以保证萃取率。实验证明,提高萃取的ｐＨ 值,有利于萃取体系选择性的提高,可以减小青霉素的损失; 提高萃取温度将极大地降低能耗; 适当降低萃取相比,有利于提高产品质量,减少对杂酸的萃取。     

葡萄糖-BrO3--Mn2+-H2SO4-丙酮体系的振荡反应

以葡萄糖为有机底物，与－ＢｒＯ３－－Ｍｎ２＋－Ｈ２ＳＯ４－丙酮组成振荡反应体系，在恒温条件下进行振荡反应。结果表明：反应有诱导期，体系电导（Ｌ）不随时间（ｔ）变化；振荡周期，Ｌ随ｔ发生周期变化，溶液颜色在粉红色与无色之间交替变化，有典型的振荡波型。诱导期及振荡周期反应的表观活化能分别为８４．２７５ｋＪ／ｍｏｌ和９８．１５３ｋＪ／ｍｏｌ。体系振荡反应物浓度范围［葡萄糖］０．０１～０．０２ｍｏｌ／Ｌ，［ＢｒＯ３－］０．０３～０．０４５ｍｏｌ／Ｌ，［Ｍｎ２＋］０．０６～０．０８ｍｏｌ／Ｌ，［丙酮］０．２７～０．３０ｍｏｌ／Ｌ，［Ｈ２ＳＯ４］０．８～１．２ｍｏｌ／Ｌ。振荡反应有Ｂｒ２产生，Ｂｒ２准一级消耗速率常数ｋＢｒ２＝１．６×１０－５Ｓ－。对温度、反应物浓度、丙酮、Ｍｎ２＋、Ｃｌ－、底物对振荡反应的影响作了探讨。     

呋喃醛缩氨基硫脲腙的合成和结构测定

使用化学纯的糠醛和氨基硫脲，在少量冰醋酸的催化下，缩合反应生成呋喃醛缩氨基硫脲腙Ｃ＿６Ｈ＿７Ｎ３ＯＳ，Ｍ＿ｒ＝１６９．２１，单斜晶系，空间群Ｐ２＿１／ｎ，ａ＝１．３５０　６（３），ｂ＝０．５６５６（５），Ｃ＝２．１０２３（２）ｎｍ，β＝９７．４３°（３），Ｖ＝１．５９２６ｎｍ￣３，Ｚ＝８，Ｄ＿ｘ＝１．４１１ｇ／ｃｍ￣３λ（Ｍ＿Ｏｋａ＝０．０７１０７３ｎｍ），μ＝３．３４８ｃｍ￣（－１），Ｆ（０００）＝７０４．８５０可观察独立反射（Ｉ＞３σ（Ｉ）使结构解出并精修到Ｒ＝０．０５３，Ｒｗ＝０．０５０，Δ／σ＝０．１４，单位权重观察值的最大误差为１．１６９．不对称单位含有二个非结晶学对称相关的独立分子，分子构型存在较大差异．缩合反应发生在杂环羰基和氨基硫脲分子中的肼基－ＮＨＮＨ＿２上，酸催化可以加速缩合反应，获得较高的产率．     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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