流动注射催化光度法同时测定铁和钒的研究

基于铁（Ⅲ）和钒（Ⅴ）对溴酸钾氧化维多利亚天蓝Ｂ褪色的催化作用及在不同反应条件下二者催化作用的差异,以及反应条件作为化学计量学中的量测通道,应用ＣＰＡ矩阵法对铁（Ⅲ）和Ⅴ同时测定进行了研究,建立了流动注射催化光度法同时测定铁和钒的方法,在铁（Ⅲ）和钒Ⅴ浓度比为１：２０￣４０：１的范围内,应用该法对其混合物进行测定,回收率分别为９５．５％和１０３．５％。     

CPA矩阵法同时测定铁和锰的研究

基于铁（Ⅲ）和锰（Ⅱ）对高碘酸钾氧化罗丹明B褪色的催化作用及在不同反应条件下两者催化作用的差异，以反应条件为化学计量学中的量测通道，应用CPA矩阵法对铁（Ⅲ）和锰（Ⅱ）同时测定进行了研究，建立了流动注射催化光度法同时测定铁和锰的新方法．在铁和锰浓度比为1：10～4：1的范围内，应用该法对其混合物进行测定，回收率分别为97．3％和104．7％．     

流动注射催化光度法同时测定铁和锰

基于铁(Ⅲ)和锰(Ⅱ)对高碘酸钾氧化罗丹明B褪色的催化作用及在不同反应条件下二者催化作用的差异，以反应条件作为化学计量学中的量测通道，应用岭回归法对铁(Ⅲ)和锰(Ⅱ)同时测定进行了研究，建立了流动注射催化光度法同时测定铁和锰的方法。在铁(Ⅲ)和锰(Ⅱ)浓度比为1：4——2：1的范围内，应用该法对其混合物进行测定，田收率分别为101．2％和101．1％。     

催化褪色光度法测定人发及粮食中的痕量铁

基于ｐＨ４．０ 的弱酸性介质中Ｆｅ（Ⅲ）对过氧化氢氧化日落黄褪色反应的催化作用,提出一种催化褪色光度法测定痕量铁的新方法,研究了该方法的适宜反应条件,方法的检出限为９．１×１０－ ７ｇ／ＬＦｅ（Ⅲ）,线性范围为０～１．２５μｇ／２５ｍ ｌＦｅ（Ⅲ）,方法用于人发及粮食中痕量铁的测定,结果满意．     

两次标准加入配位滴定法同时测定铁和铝

讨论了两次标准加入配位滴定法双组份同时测定的原理，用该法对水泥及模拟样品中的铁（Ⅱ）和铝（Ⅲ）进行了同时测定，得到了较满意的结果，铁（Ⅱ）和铝（Ⅲ）的加标回收率分别为１０１％和９８．５％。     

以TAN反相高效液相色谱法分离测定镓(Ⅲ)、锇(Ⅲ)、钒(Ⅴ)、铜(Ⅱ)

用1-（2-噻唑偶氮）－2-萘酚（TAN）作柱前显色剂，以反相高效液相色谱法测定镓（Ⅲ）、锇（Ⅲ）、钒（Ⅴ）、铜（Ⅱ）离子，固定相为Shim－packODS柱（15mm×6mm），流动相为含有5x10（－2）mol／L的漠化四丁锭，5×10（－6）mol／L的TAN，1×10（－2）mol／L乙酸－酸钠缓冲溶液（pH6．5）的甲醇（55％）－乙腈（5％）－水（40％）溶液，流量0．8ml／min用紫外-可见分光光度检测器于440nm处进行检测．在此条件下，镓（Ⅲ）、锇（Ⅲ）、钒（Ⅴ）、铜（Ⅱ）的得到很好的分离。该方法可用于镓（Ⅲ）、锇（Ⅲ）、钒（Ⅴ）、铜（Ⅱ）的同时测定．     

酸性铬蓝K光度法测定煤矸石中微量钒

研究了酸性铬蓝Ｋ（ＡＣＢＫ） 与钒（Ｖ） 的褪色反应,褪色程度与钒（Ｖ） 量线性相关,借此建立了测定微量钒的分光光度法－ 结果表明,有色溶液的最大吸收波长为５２０ ｎｍ ,摩尔吸光系数为１ ．１ ×１０４Ｌ／ｍｏｌ·ｃｍ ,钒（ Ⅴ） 量在０ ．０ ～３ ．２０ ｍｇ／Ｌ 范围内符合比耳定律－ 本法用于测定煤矸石中的微量钒时,获得了满意的结果－ 表１ ,参５－     

动力学抑制光度法测定痕量铁

在ｐＨ８．３的硼酸－氢氧化钠缓冲溶液中，Ｆｅ（Ⅲ）对过氧化氢氧化罗丹明Ｂ的褪色反应有阻抑作用．据此，本文以固定时间法对反应条件进行了选择，建立了动力学光度法测定痕量铁的新方法．可测范围：０～０．０４ｍｇ／Ｌ，灵敏度：９．２０×１０－７ｇ／Ｌ，用于试剂级盐酸和硝酸中微量铁的测定，相对标准偏差分别为６．０％和５．３％，平均加标回收率为９７．３％和９７．５％     

无毒增塑剂乙酰柠檬酸三丁酯的合成

用固体氯化物催化合成柠檬酸三丁酯,柠檬酸三丁酯和乙酸酐反应合成乙酰柠檬酸三丁酯。研究了催化剂用量、原料配比、反应温度、反应时间对合成反应的影响,确定了最佳工艺条件：（１）酯化反应：柠檬酸∶正丁醇为１∶３．５（ｍｏｌ）;反应温度为１３０℃;反应时间５ｈ,催化剂用量０．７％;（２）乙酰化反应：柠檬酸三丁酯∶乙酸酐为１∶１．６,反应温度为８５℃,反应时间为１ｈ,催化剂用量为０．０６％。酯化收率为９６．３％,乙酰化收率为９８．５％。     

光化动力学法测定痕量钒

研究在草酸盐离子存在下, 用紫外光照射含铁（ Ⅲ） 溶液, 通过光化学反应产生的铁（ Ⅱ）与溶液中的钒（ Ⅴ） 作用, 采用改进的永停法进行终点检测． 结果表明, 溶液含钒的量与到达检测终点的时间呈良好的线性关系． 据此可以测定试样中钒的含量． 用ＢａＳＯ４ 作共沉淀剂以共沉淀的形式, 把铬（ Ⅵ） 共沉淀以消除其对测定的影响．     

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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