抗坏血酸在钼蓝法测定微量SiO2中的应用

研究了以抗坏血酸为还原剂，用光度法测定碳化硅超细粉中微量ＳｉＯ２的方法，结果表明，最大吸收波长为８００ｎｍ，表观摩尔吸光系数为２．５０＊１０＾４Ｌ／（ｍｏｌ．ｃｍ），线性范围为０．０５－０．０７ｍｇ／Ｌ，平均回收率为９９．３２％，ＲＳＤ为１．６７％，该法适用于碳化硅超细粉中微量ＳｉＯ２的测定。     

对磺酚偶氮罗丹宁的光度性质研究

合成了新试剂５－（２－对－磺酚）偶氮）－罗丹宁,研究了ＳＰＡＲＨ的光度性质,在ＰＨ为４．１０的缓冲溶液中,当有质量分数为０．１０％的Ｔｗｅｅｎ－８０存在时,Ｐｄ（Ⅱ）与ＳＰＡＲＨ形成１：２的约色络合物,最大吸收波长为５１０ｎｍ,摩乐吸光率为３．８１＊１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾－１。提出的方法用于钯－分子筛催化剂中钯含量的测定,结果满意。     

铬黑T作显色剂分光光度法测铁

在ＰＨ≈１０的氨－氯化铵缓冲溶液中,Ｆｅ＾３＋与铬黑Ｔ形成１：３的暗红色配合物,其最大吸收波长在４８８ｎｍ处,ε值约为２．３＊１０＾４,线性范围为０－３０μｇ／２５ｍｌ。此方法可用于工业盐酸,普通硅酸盐水泥等样品中铁含量的测定,其结果与火焰原子吸收法较好吻合。     

间磺酸基偶氮安替比林光度测定铜的研究

研究了间磺酸基偶氮安经林光度测定铜的适宜条件及其应用。该试剂在微碱性介质硼砂－盐酸中与铜生成１：２的蓝色配合物,配合物在６２０ｎｍ波长处有最大吸收,铜浓度在０－２０μｇ／２５ｍｌ之间符合比尔安律,摩尔吸光系数为３．８５＊１０＾４,用该方法测定了铁合金中微量铜,结果满意。     

萘啶酮酸体系导数荧光法测定铥,铽

在ＰＨ７．５、３．０＊１０＾－４ｍｏｌ／Ｌ萘啶酮酸溶液、激发波长为２８０ｎｍ的最佳条件下,采用一阶导数荧光技术,在荧光波长４７６ｎｍ处测定Ｔｍ＾３＋、在５４０ｎｍ处测定Ｔｂ＾３＋。由于采用导数荧光技术,不但消除了Ｔｂ＾３＋荧光峰对测定Ｔｍ＾３＋的干扰,使Ｔｍ＾３＋、Ｔｂ＾３＋的同时测定成为可能,还显著提高了Ｔｍ＾３＋的灵敏度,使Ｔｍ＾３＋的检测限达到０．０１μｇ／ｍＬ。     

钌(Ⅲ)-钼酸盐-乙基罗丹明B-PVA体系缔合显色反应研究

在聚乙烯醇存在下,钌与钼酸盐和乙基罗丹明Ｂ（ＥＲＢ）形成有色离子缔合物。最佳反应条件为「ＨＣｌＯ４」＝１．２ｍｏｌ．Ｌ＾－１,「ＭｏＯ＾２－４」＝６．８＊１０＾－４ｍｏｌ．Ｌ＾－１,「ＥＲＢ」＝３．２＊１０＾－５ｍｏｌ．Ｌ＾－１,ｗ（ＰＶＡ）＝０．０８％。缔合物的最大吸收位于５７５ｎｍ,表观摩尔吸光系数ε＝２．３２＊１０＾６Ｌ．ｍｏｌ＾－１．ｃｍ＾－１,钌量在０－２４μｇ．Ｌ＾－１范围内服从比耳定     

杯芳烃的主客体化学传感器研究：对苯二酚的测定

选用Ｃ－十一烷基间苯二酚 （４）芳烃作为主体分子,交 修饰在玻碳电极上,制成了一种主客体化学传感器,对溶液中的客体分子－对苯二酚进行了测定。该电极具有良好的选择性,对５．０＊１０＾－５－１．５＊１０＾－３ｍｏｌ／Ｌ的对苯二酚具有很好的线性响应,检测下限为２．５＊１０＾－５ｍｏｌ／Ｌ。     

利用植酸对磺基水杨酸铁的脱色作用比色法测定植酸含量

研究了磺基水杨酸铁同植酸的转络反应所引起溶液颜色的变化，并把该转络反应用于植酸含量的比色测定。溶液酸度为ＰＨ２．５－３时，平衡混合物最大吸收波长为５００ｎｍ，植酸浓度为０．１５１５×１０＾－３－０．１５１５×１０＾－５ｍｏｌ／Ｌ区间内的光吸收符合朗伯比尔定律，该法回收率为１００．６７％。     

壳聚糖包埋Ru(bpy)2+3/SiO2复合膜电极电化学发光特性

制备了壳聚糖包埋Ｒｕ（ｂｐｙ）＾２＋３／ＳｉＯ２复合膜电极,对其电化学发光特性的研究表明：铂和玻碳复合膜电极循环伏安曲线的阳极峰分别在１１５０和１３７０ｍＶ,阴极峰分别在１０５０和１２６０ｍＶ;复合膜电极的荧光发射光谱位于５８５ｎｍ;电极的响应时间为１０ｓ,对基质具有电位和ＰＨ选择性;对５．５＊１０＾－４－１．０＊１０＾－２ｍｏｌ．Ｌ＾－１的草酸和抗坏血酸分别有相关系数为０．９９５和０．９９２的线     

分光光度法测定药物及生化样品中的铋

在ＰＨ４．５－６．５的六次甲基四胺－盐酸介质中，水杨基荧光酮－溴化十六烷基三甲铵－Ｂｉ（Ⅲ）－硫脲形成一种红色络的，春最大吸收波长为５５０ｎｍ，表观摩尔吸收系数为１．３５＊１０＾５Ｌ．ｍｏｌ＾－１．ｃｍ＾－１，铋量在１－３０μｇ／２５ｍｌ范围内符合比尔定律。直接测定药物及生化样品中的铋，回收率达９６％。     

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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