乙酰胺-尿素-NaBr熔体中Ce3+和Ni2+的电化学行为及其诱导共沉积

在353K的乙酰胺-尿素-NaBr熔体中,Ni(Ⅱ)一步不可逆还原为金属Ni,测得在Pt电极上α为0.27,D0为4.65×10-5cm2.s-1.该条件下Ce(Ⅲ)不能单独还原为Ce,但可以被Ni(Ⅱ)诱导而共沉积.由恒电位电解法得到Ce-Ni合金,Ce的含量随阴极电位的负移,Ce(Ⅲ)/Ni(Ⅱ)摩尔比增大及电解时间延长而增大,最大可达32.76%.     

乙酰胺-尿素-NaBr熔体中Nd-Ni合金的电化学制备

在353K的乙酰胺-尿素-NaBr熔体中,Ni（Ⅱ）一步不可逆还原为金属Ni,Nd（Ⅲ）不能单独还原为Nd,但可以被Ni（Ⅱ）诱导而共沉积.由恒电位电解法得到非晶态的Nd-Ni合金,Nd的含量随阴极电位的负移,Nd（Ⅲ）/Ni（Ⅱ）摩尔比增大及电解时间延长而增大.     

乙酰胺-尿素-NaBr熔体中Eu-Ni合金的电化学制备

利用循环伏安法,研究在353K的乙酰胺-尿素-NaBr熔体中,Ni（Ⅱ）一步不可逆还原为金属Ni,Eu（Ⅲ）不能单独还原为Eu,但可以被Ni（Ⅱ）诱导而共沉积.由恒电位电解法得到Eu-Ni合金,Eu的含量随阴极电位的负移,Eu（Ⅲ）/Ni（Ⅱ）摩尔比增大及电解时间延长而增大.     

2—(5—溴—2—吡啶偶氮)—5—二乙氨基苯酚及它的 Ni(Ⅱ),Co(Ⅱ),Zn(Ⅱ),Cd(Ⅱ)配合物的吸附伏安特性

本文研究了 NH_3/NH_4Cl 溶液中2—(5—溴—2—吡啶偶氮)—5—二乙氨基苯酚的吸附还原特性及其与 Ni(Ⅱ),Co(Ⅱ),Zn(Ⅱ),Cd(Ⅱ)形成的配合物在 NH_3/NH_4Cl 溶液中的吸附伏安特性。发现它们在电势负于金属—氨配合物还原电势处产生有吸附性的还原波,表面反应是不可逆的。     

喹哪啶酸铽(Ⅳ)固态化合物的制备及性质

由于 E~0Tb(Ⅳ)/Tb(Ⅲ)高达3.1伏,Tb(Ⅳ)不能存在于一般水溶液中。国内外用无机或有机络合剂稳定水溶液中 Tb(Ⅳ)的工作有过一些报导,但对 Tb(Ⅳ)有机固态化合物的研究,未见任何报导。我们以碱式碳酸铽(Ⅳ)和喹哪啶酸(?)为原料,在一定条件下,于水溶液中反应,得到了 Tb(Ⅳ)(Ⅲ)喹哪啶酸固态化合物,对     

大孔膦酸树脂对铽的吸附性能研究

就大孔膦酸树脂(简称PAR)对铽(Ⅲ)的吸附性能进行了研究.实验选在pH为5.6的HAc-NaAc缓冲体系中进行.在实验条件下,树脂吸附铽离子的吸附速率随铽离子质量浓度的增大而增大,随温度的升高而增大,随振荡频率的增大而增大,随树脂粒径的减小而增大.     

2-乙酰基苯并咪唑缩牛磺酸Schiff碱铽配合物的合成及性质研究

在甲醇溶液中合成了新型2-乙酰基苯并咪唑缩牛磺酸Schiff 碱配体及其铽(Ⅲ)配合物,通过元素分析、质谱、核磁共振谱、红外光谱、三维荧光激发和发射光谱进行了分子组成确证及性质研究.结果表明,铽(Ⅲ)配合物组成为Tb2L3(NO3)3(L=C11H12N3O3S),该配合物的荧光除受中心离子微扰的配体发光外,还有明显的中心Tb3+离子窄带发射,在220.0～350.0 nm(最佳激发波长为320.0 nm)激发时,发射中心Tb3+离子的特征窄带荧光;在350.0～540.0 nm(最佳激发波长为410.0 nm)激发时,产生550.0 nm的发射谱线;在波长为860.0 nm的锐光激发下,发射490.0 nm的上转换荧光.     

铽-2-甲硫基烟酸掺杂配合物的合成及荧光性质研究

以2-甲硫基烟酸(HA)与Tb(III)合成了二元配合物和15种分别掺杂La(III)、Y(III)、Zn(II)的三元配合物.通过红外、紫外、元素分析、荧光光谱对配合物进行了表征,着重研究了掺杂离子质量分数对配合物中Tb(III)发光性能的影响.紫外光谱显示HA与Tb(III)配位后其吸收峰强度发生较大改变.红外光谱表明2-甲硫基烟酸中的羧基与铽离子以螯合双齿配位,且单一配合物和掺杂配合物具有相似的配位结构.荧光光谱表明La(III)、Y(III)、Zn(II)掺杂可以提高铽配合物的荧光强度,其中Y(III)掺杂荧光强度增强最明显.     

铽—EDTA—水杨酸—表面活性剂荧光体系的研究

研究了铽(Ⅲ)-EDTA,水杨酸(SA)—表面活性剂四元离子缔合物荧光体系并用于痕量铽的测定。存在表面活性剂 CTMAB 时,Tb(Ⅲ)—EDTA—水杨酸体系的荧光强度比无 CTMAB 存在时提高11倍。引入 CTMAB 后体系在紫外区的吸收峰红移3nm。测定在1.0×10~(-4)M EDT4,2.0×10~(-4)M SA,2×10~(-3)M CTMAB 和 pH11.7-12.5的水溶液中进行。研究了十几种阳离子表面活性剂对体系荧光强度的影响,发现 CTMAB 和 Zeph 对 Tb(Ⅲ)荧光反应的增敏效果最好。同时比较了七种氨羧络合剂的协同作用,其中以 EDTA 最为适用。试验了稀土离子和常见阳离子、阴离子的干扰情况。用多点增量标准加入法测定合成试样中的铽,结果满意。     

乙酰胺-尿素-NaBr熔体中Sm-Co合金的电化学制备

利用循环伏安法,研究在353K的乙酰胺-尿素-NaBr熔体中,Co(Ⅱ)还原为金属Co是一步不可逆过程,Sm(Ⅲ)不能单独还原为Sm,但可以被Co(Ⅱ)诱导而共沉积.由恒电位电解法得到非晶态的Sm-Co合金,Sm的含量随阴极电位的负移,Sm(Ⅲ)/Co(Ⅱ)摩尔比增大而增大.     

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.     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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