五氯化二氧六环合铈(Ⅳ)的合成

本文用氢氧化铈(Ⅳ)在二氧六环中,通入干燥的 HCI 气体,得到了热稳定性较好的四或五氯化二氧六环合铈(Ⅳ)配合物 Ce(C_4H_8O_2)_4Cl_4或 HCe(C_4H_8O_2)_4Cl_5.元素分析表明,理论值与计算值是相符的.     

10—钨铈(Ⅳ)酸及其盐的制备与性质研究

本文用10—钨铈(Ⅳ)酸钠溶液通过阳离子交换树脂制得了10—钨铈(Ⅳ)酸溶液,并用冻析法制得了固体10—钨铈(Ⅳ)酸。通过化学分析,得知其组成为H_6[CeW_（10）O_（35）]19H_2O。并对10—钨铈(Ⅳ)酸及其盐的性质进行了测试。红外(IR)分析显示,10—钨铈(Ⅳ)酸与10—钨铈(Ⅳ)酸纳相比,在生成10—钨铈(Ⅳ)酸的过程中,聚合杂多阴离子的结构有些变形。此外,10—钨铈(Ⅳ)酸及其盐与其它杂多酸相比,性质上差异较大,稳定性也较差。     

巯基棉富集—阳极溶出伏安法测定水中痕量砷和硒

本文叙述了用巯基棉富集—阳极溶出伏安法测定水中痕量砷和硒的方法。将水样经盐酸酸化成1M酸度后通过巯基棉富集,以NaCl饱和的6N HCl洗脱干扰离子,然后用H_2SO_4—H_2O_2消解此巯基棉,消解液分成两份,一份在HClO_4存在下以金膜玻炭为工作电极阳极溶出法直接测定Se(Ⅳ),另一份用硫酸肼将As(Ⅴ)还原为As(Ⅲ)后也用同法测定。并就巯基棉的制备方法和性质进行了一些探索。     

镧铈的纸上反相层析分离

本文用纸上反相层析法模拟液液萃取研究了N-235—煤油—DTPA—LiNO_3—HNO_3体系对镧、铈的分离。在规定的固定相浓度范围内,当盐析剂浓度〔LiNO_3〕=4.0-5.OM,溶液的pH?1.9时,获得镧与铈分离的较好效果。并用饱和法测定了N-235与铈(Ⅲ)所形成的萃合物的组成。     

~(75)A_S~ 离子注入的AI_2O_3膜抗腐蚀性的研究

本文研究了用~(75)A_s~ 离子注入的Al_2O_3膜的抗腐蚀性。Al_2O_3膜在磷酸中的最小腐蚀速率(或最佳的~(75)A_s~ 杂质浓度)能根据实验结果和类高斯离子射程分布得到。实验结果表明,注入离子的Al_2O_3膜在H_3PO_4—CrO_3溶液中的腐蚀率要比未注入的Al_2O_3膜在相同条件下的腐蚀速率小10倍以上。因此,甚至在酸中,离子注入在改善材料表面层的抗腐蚀性方面也是有希望的技术。     

铈(Ⅲ)在焦磷酸钠溶液中的光助氧化反应

在Ce(ClO_4)_3—Na_4P_2O_7—(NH_4)_2S_2O_δ—HClO_4体系中,以20W 低压汞灯作光源,利用光助氧化反应,制得了 CeP_2O_7沉淀,并研究了溶液的酸度、光辐射时间、铈(Ⅱ)初始浓度及沉淀剂浓度对沉淀中 Ce(IV)/∑Ce 比值的影响.测定了光助氧化反应级数及固态化合物的组成、热稳定性、红外光谱和(?)(IV)与其它稀土元素的分离因数.     

处理含铬废水的新方法

本文提出使用碳—毡电极作为电化学富集材料,对含铬离子废水进行净化处理。实验结果表明对100—2000(ppb)的纯Cr~(3 )溶液进行处理时富集效率达98％以上;对工业废水——含Cr~(6 )为10~(-2)—10~(-5)M、Cr~(3 )为10~(-5)-10~(-7)M首先在pH为2.5—3.0用Na_2S_2O_3·5H_2O将Cr~(6 )还原成Cr~(3 ),然后将pH控制在7左右用10％NaOH 将Cr~(3 )变成Cr(OH)_3沉淀,对滤液中Cr~(3 )经“电化学碳—毡电极系统”处理后流出液中Cr~(3 )含量基本上与实验用蒸馏水相近。实验装置简单。可连续使用,实验数据用原子吸收光谱法测定。     

不锈钢钝化膜的椭圆法及电化学研究

本文用椭园法和电化学方法研究lcr18Ni9Ti不锈钢在含K_2Cr_2O_7的纯化液(5％HNO_3+3％H_3PO_4)中形成的纯化膜及此不锈钢钝化膜在维纶醛化液中的电化学行为。结果表明:(1)钝化膜的生长遵从对数规律;膜的比电阻约为10~(12)(?)—cm,故这种膜有良好的保护性。(2)膜的极化电阻随温度升高而下降,电容则随温度升高而上升,这是由于膜中形成了孔隙。     

稀土磺基水杨酸络合物与抑菌效应

在无水乙醇介质中合成了3价(钅兰)、铈、镨、钕的磺基水杨酸络合物和4价铈的磺基水杨酸络合物。经元素分析、红外光谱、可见紫外光谱和热分析得知,Ce(Ⅲ)L·nH_2O 络合物,是一种含磺基水杨酸根、硝酸根的三结晶水的络合物,其组成是:Ce(Ⅲ)(C_7H_5O_6S)_2·NO_3·3H_2O,在60℃下脱水,312℃开始分解。Ce(Ⅳ)L’·nH_2O 络合物是一种含磺基水杨酸根、硝酸根和铵离子的六结晶水的络合物,其组成可能是:NH_4[Ce(Ⅳ)_2(C_7H_3O_6S)_2(C_7H_4O_6S)·NO_3]·6H_2O在62℃下脱水,在301℃开始分解。用平皿洞穴法研究了 La、Ce、Pr、Nd 等(钅兰)系元素的3价络合物对真菌的抑茵效应,它们的抑菌圈宽度超过22～35mm,均属于强的抑菌效应。     

庆大霉素损伤条件下大肠杆菌内源过氧化氢对间体膜囊的作用

为了探讨细菌受到抗生素损伤后,内源过氧化氢(H_2O_2)对间体膜囊的影响,通过庆大霉素损伤大肠杆菌。以电导率和丙二醛(MDA)为损伤指标,采用组织化学染色法,通过透射电子显微镜,观察经庆大霉素损伤后大肠杆菌内源H_2O_2和间体膜囊的变化。研究结果表明:庆大霉素损伤可提高大肠杆菌的内源H_2O_2浓度、间体膜囊数量以及间体膜囊周围的H_2O_2浓度。在间体膜囊外排的过程中,使用Tris-HCl蔗糖高渗溶液进行处理之后,H_2O_2浓度显著提升,电导率大幅度降低。庆大霉素和过氧化氢酶处理后,间体膜囊中的MDA浓度升高,损伤加重。庆大霉素损伤导致大肠杆菌的间体膜囊外周聚集大量的H_2O_2,且这些H_2O_2对间体膜囊具有保护作用。     

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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