铬菁R—阳离子表面活性剂分光光度法测定微量锆(铪)

锆(铪)与铬菁R的二元络合物在pH=1.8—2.5时生成红色络合物,其λ_(max)=540nm,ε=6.0×10~4,但锆(铪)——铬菁R——表面活性剂三元体系尚未见报道。本实验在二元络合物的基础上,研究了锆(铪)铬菁R—阳离子表面活性剂三元络合物。实验结果表明:在pH=2.5—3.2范围内,锆(铪)与铬菁R—氯化十四烷基吡啶形成紫色络合物,λ_(max)=580nm,ε=9.6×10~4,灵敏度比相应的二元络合物提高了60％,并且可在水相中直接进行测定,可视为测定锆(铪)的较好方法之一。     

1—苯基—3—甲基—4—苯甲酰基—吡唑酮—5与钍及稀土元素的作用 ——(Ⅱ)萃取过程中铈的变价行为及萃合物的制备与性质的研究

本文研究了Ce(Ⅲ)与1-苯基-3-甲基-4-苯甲酰基-吡唑酮-5(PMBP)的作用。实验结果表明:萃取络合物的组成随萃取剂的浓度而改变,当[PMBP]<0.2M及≥0.2M时萃取分别按下式进行:萃取络合物在有机相中以单分子形式存在。测定了CeA_3·HA的萃取平衡常数。lgK=-4.30±0.05。发现Ce(Ⅲ)在萃取过程中可被空气氧化成Ce(Ⅳ)。在不同条件下由萃取相中制得了Ce(Ⅲ)和Ce(Ⅳ)与PMBP的固态络合物,其组成分别为CeA_3·HA及CeA_4并对其结晶形状、熔点、热稳定性、红外光谱及在某些溶剂中的溶解情况进行了研究。     

铝—铬天青S—溴化十六烷基三甲基铵的组成研究

本文用等摩尔系列、摩尔比、制备法研究了 Al—CAS—CTMAB 多元络合物的组成,得到:Al∶CAS∶CTMAB=1∶3∶2、1∶3∶4、1∶3∶10、1∶3∶2和1∶3∶4多元络合物是计量组成络合物,它们均难溶于水。当 CTMAB 浓度较大时,以1∶3∶4络合物为中心,外绕6个 CTMAB 胶束,形成1∶3∶10高次胶束络合物,并由胶束增溶而溶于胶体溶液中。灵敏度的提高和最大吸收波长移动是由于逐级形成络合物。并提出了可能的络合物模型。     

1,1′—(1,3—亚丙基)二茂基钐和铕的氯化物及其醋酸衍生物的合成

本文报导了四种新络合物的合成: 这些络合物均经元素分析、红外光谱及质谱鉴定。     

铬—水杨基萤光酮—曲拉通—100多元络合物组成的研究

本文用等摩尔系列、摩尔比、制备法研究了 Cr-SAF-TritonX-100的组成,得到:Cr∶SAF∶TritonX-100=1∶4∶2、1∶4∶20、1∶4∶50三种,其中1∶4∶2、1∶4∶20络合物难溶于水,其固体产品进行了红外光谱分析和全分析。1∶4∶50是形成的高次胶束络合物,并由胶束增溶溶于胶体溶液中。增敏和最大吸收波长红移是由于逐级形成络合物。本文并提出了可能的络合物模型。     

溶液络合物的平衡理论Ⅲ——对数函数外推法求各级络合物的稳定常数

本文建议用对数函数外推法处理萃取法求各级络合物稳定常数的数据,可以避免法中图解微分和图解积分两次转换及由此引进的误差,并具体应用于TBP萃取法测定硝酸钍~(234)(UX_1)络合物的各级稳定常数,结果如下:K=19.2,β_1=3.3,β_2=5.6,β_3=7.0,β_4=1.9。 对数函数外推法也可用于溶度法,离子交换法,极谱法等。文中用前二报告中提出的理论对对数函数作图易得直线的原因作了详细的分析,同时也讨论了它的应用范围和局限性。     

2—(3.5—二氯—2—吡啶偶氮)—5—二甲氨基苯酚分光光度测定微量钒

本文研究了钒(V)在过氧化氢存在下与2—(3.5—二氯—2—吡啶偶氮)—5—二甲氨基苯酚(筒称3.5—dicl— DMPAP)形成三元络合物的条件及其组成。试验表明,络合物最大吸收波长为580nm,摩尔吸光系数ε_(580)=4.6×10~4,组成为V(V):3.5—dicl—DMPAP:H_2o_2=1:1:1,钒浓度在0～20μg/25ml内符合比尔定律。在磷酸介质中、除铜、钴钯允许量较小外,其它常见离子允许量均较大,该法已用于矿样及钢样中微量钒的测定。方法速度快、灵敏度较高、选择性好。     

利用■系元素—氨基G酸偶氮氯膦—氯代十六烷基吡啶—乙醇多元络合物体系测定铈组稀土含量

稀土三元或多元络合物的研究,是近年来国内外在稀土光度分析领域中的一个新进展。以三苯甲烷类染料为配位体的稀土三元或多元络合物的主要特点是灵敏度高,摩尔吸光系数可达10~5以上。但络合反应大多在中性或弱酸性介质中进行,反应选择性不够高,因而实际应用受到一定限制。以偶氮类试剂为配位体的稀土多元络合物,如镧系元素——偶氮氯膦Ⅲ——阳离子表面活性剂的络合体系,可在酸性介质中进行反应,抗干扰能力比较     

3—苯基偶氮—5—磺基水杨酸与钕（Ⅲ）,铜（Ⅱ）络合物的合成与表征

在ｐＨ＝３．８酸性条件下合成了３－苯基偶氮－５－磺基水杨酸与Ｎｄ（Ⅲ）的酸式络合物，在弱碱性条件下合成了该染料与Ｎｄ（Ⅲ）的羟式络合物及Ｃｕ（Ⅱ）的络合物，对这些络合物进行了元素分析、热重分析，并测定了电导和红外光谱，确定了分子式，讨论了可能的配位环境。Ｎｄ（Ⅲ）的络合物中奶均以二齿形式配位，偶氮基皆未参与配位，羧式络合物中酚基则参与配位。在Ｃｕ（Ⅱ）的络合物，羧酸根以二齿形式配位，酚基，偶氮基也     

邻羟基苄胺及其络合物的研究(Ⅲ)——镍-氮三乙酸-邻羟基苄胺混合型络合物

邻羟基苄胺(HBA)单一型络合物曾有过研究.镍与四配价氮三乙酸(NTA)1:1的络合物还有可被取代的配位水分子,因而与胺、酚类、羧酸、羟基羧酸、氨羧酸等可形成混合型络合物.本文对Ni(II)-NTA-HBA体系用分光光度法研究了混合型络合物的生成,用pH电位法研究了Ni-NTA与HBA的加合反应并测得了此混合型络合物的     

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

正~~