溶致变色荧光法测定丙酮中的水

３－羟基－４－Ｎ,Ｎ－二甲胺基黄酮具有强的溶致变色性质,其丙酮溶液中含有少量水时,具有正常Ｓｔｏｋｅｓ位移峰的发射波长红移,荧光强度显著增加,基于此,本研究提出了一个新的丙酮中水含量测定的荧光分析方法,在体积分数为０．１－１０．０％的水含量范围内,荧光强度与水的体积分数线性相关,对０．５％及５．００％的水测定的相对标准偏差分别为４．２％和２．３％,丙桐中可能存在的微量醇类和醛类杂质对无影响,该法简     

反相高效液相色谱法测定补肾益寿颗粒中淫羊藿…

应用反相高效液相色谱法，建立了测定纯中约制剂补肾益寿颗粒中活性成分淫羊藿甙含量的方法。样品以７０％乙醇超声波振荡提取，在下列色说条件下测定：固定相ｓｈｉｍｐａｃｋ ＣＬＣ－ＯＤＳ；流动相乙腈－甲醇－０．１ｍｏｌ／Ｌ磷酸二氢钠；流速１．０ｍｌ／ｍｉｎ；检测波长２７０ｎｍ；线性范围０．１１５－０．６９０μｇ；加样回收率９９．０８±１．７６％；日仙精密度１．０５－１．１９％，该法简便，快速，准确。     

5‘—硝基水杨基荧光酮荧光猝灭法测定微量锡

基于Ｓｎ－５‘－硝基水杨基荧光酮－Ｔｗｅｅｎ－８０体系的荧光猝灭效应，提出一种测定微量锡的新荧光分析方法。在０．８－１．２ｍｏｌ／Ｌ的硫酸介质中，在Ｔｗｅｅｎ－８０存在下，锡与５’－Ｎ－ＳＡＦ形成摩尔比为１：４的橙红色络合物。该体系存在两个激发峰，其激发波长分别为λｅｘ１＝４７５ｎｍ，λｅｘ２＝５０５ｎｍ，发射波长λｅｍ＝５２５ｎｍ。     

新显色剂5－（4＇－氯－2＇羧基苯偶氮）绕丹宁与银的显色反应及其应用研究

在ＴｒｉｔｏｎＸ－１００存在下，ｐＨ＝５．０～５．５时，新试剂Ｃｌ－ＲＡＣＰ与银生成配合物，其最大吸收波长为５００ｎｍ，配合物的配位比为１：２，表观摩尔吸光系数为１．１×１０￣５·Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１）。Ａｇ（Ⅰ）的浓度在０～２．０μｇ·ｍｌ￣（－１）范围内符合比尔定律。该法用于阳极泥和废定影中银的测定，结果较满意，相对标准偏差为１％。     

铕—二苯甲酰甲烷—邻菲罗啉—CTAB体系的荧光研究

在阳离子表面活性剂ＣＴＡＢ存在下，研究了铕－二苯甲酰甲烷－邻菲罗啉三元配合物在水溶液中荧光发射的性质。采用３７０ｎｍ光波激发，配合物的最大特征荧光发射波长为６１４ｎｍ。当ＣＴＡＢ的浓度达到０．４５ｍｍｏｌ·Ｌ＾－１时，配合物的荧光强度达到最大，Ｅｕ＾３＋浓度在０￣０．１ｎｇ·Ｌ＾－１范围内，它与荧光强度有良好的线性关系。实验表明，检出下限可达１ｆｇ·Ｌ＾－１。     

反相高效液相色谱法测定补肾益寿颗粒中淫羊藿甙的含量

应用反相高效液相色谱法，建立了测定纯中药制剂补肾益寿颗粒中活性成分淫羊藿甙含量的方法．样品以７０％乙醇超声波振荡提取，在下列色谱条件下测定：固定相ｓｈｉｍｐａｃｋＣＬＣ－ＯＤＳ（１５０ｍｍ×６ｍｍ，５μｍ）；流动相乙腈甲醇－０．１ｍｏｌ／Ｌ磷酸二氢钠（６∶４６∶５０，ｖ／ｖ）；流速１．０ｍｌ／ｍｉｎ；检测波长２７０ｎｍ；线性范围０．１１５～０．６９０μｇ（ｒ＝０．９９９９）；加样回收率９９．０８±１．７６％；日内精密度１．０５％～１．１９％．该法简便、快速、准确     

荧光素荧光法测定痕量硫氰酸根的研究

报道了以荧光素为指示剂,荧光法间接测定痕量ＳＣＮ－的新方法．在ｐＨ＝５．５～７．５的中性缓冲溶液中,Ｉ２与荧光素反应,使荧光素的荧光猝灭．当加入ＳＣＮ－时,ＳＣＮ－和Ｉ２反应使体系荧光增强,该体系激发波长、发射波长分别为４９４ｎｍ和５１５ｎｍ,ＳＣＮ－含量在１．０～６０μｇ／Ｌ范围内呈良好的线性关系,检测下限为１．０μｇ／Ｌ．该方法灵敏度高,选择性好,用于吸烟人和非吸烟人唾液中痕量ＳＣＮ－测定,结果令人满意．     

反相高效液相色谱法测定3H状元胶囊中的1α—羟基维生素D3

使用反外ＨＰＬＣ法测定３Ｈ状元胶囊中的１α－羟基维生素Ｄ３，固定相为Ｃ１８，流动相为乙腈：水（９７：３），测定波长为２６５ｎｍ标样线性范围为０．１～１．０μｇ／ｍＬ（ｒ＝０．９９８８，ｎ＝５）最低检出率为０．５ｎｇ，天内天间精密度分别为１．４１％（ｎ＝１０）和２．７２％（ｎ＝３）平均回收率为９９．１％（ＲＳＤ＝２．７８％），该方法用于测定３Ｈ求元胶囊的１α－羟基维生素Ｄ３，取得较满意的结果。     

硫唑嘌呤氧化反应的荧光光谱法研究

研究了硫唑嘌呤的水解产物与ＫＭｎＯ４的氧化作用，提出了高灵敏测定硫唑嘌呤的荧光光度分析新方法。在碱性介质中，将硫唑嘌呤通过沸水浴加热水解－ＫＭｎＯ４氧化，使其转化成６－嘌呤磺酸钠，该产物不仅具有强的荧光且稳定性好。本体系的激发波长为２８６ｎｍ，发射波长为３９７ｎｍ，荧光强度Ｆ与硫唑嘌呤的含量在０．０１～０．５ｍｇ／Ｌ范围内呈线性关系，检测限为０．００５ｍｇ／Ｌ。应用该法于片剂中硫唑嘌呤含量的测定，     

几种芳烃衍生物型捕收剂的液相色谱分离和测定

报道了一种反相ＨＰＬＣ方法对几种芳烃衍生物型捕收剂的分离和测定．该法借助色谱柱ＬｉＣｈｒｏＣＡＲＴ１００ＲＰ１８（５μｍ）,流动相：甲醇－水－５％Ｈ３ＰＯ４－５％Ｈ２ＳＯ４（４５∶５５∶４∶０．５,体积分数）和紫外检测器在２８５ｎｍ波长下进行．在０．０００５～０．０１ｇ／Ｌ浓度范围内,方法的相对标准偏差为１．１％～２．４％．水杨羟肟,苯并三唑,水杨醛肟,水杨酸,铜铁灵等的检出限分别为１．０×１０－６,０．２×１０－６,１．０×１０－６,５．０×１０－６和６．０×１０－６ｇ／Ｌ,所研制的方法已应用于矿物浮选过程实际样品的分析．     

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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