碘的测量方法

本主要从药品的来源，实验反应设备、条件、灵敏度，实验结果的偏差及回收率等方面比较了多种测量碘的方法，从中选出了最佳测量碘的方法。     

实验室废碘液中碘的回收研究

研究了从实验室废碘液中提取碘的两种方法．第一种方法是利用氧化还原反应,采用分离、萃取、升华等工序回收废碘液中碘的工艺．另一种方法是利用氧化还原反应将废液中的l2还原为l^-,浓缩后加入工业级硫酸铜作沉淀剂,在适量还原剂存在的条件下使l^-全部转化为Cu2l2沉淀,然后加浓硝酸氧化之获得单质l2的工艺．通过实验得知,这两种方法所得的碘纯度高、回收率高．     

含炭难处理金矿石碘法浸出

用非氰试剂——碘从矿石中浸出黄金，目的是研究碘化浸金取代剧毒氰化物提金的可行性；采用了热力学方法对碘-碘化物溶金的可能性进行了简单分析，用碘-碘化物溶液对含炭难处理金矿石进行了浸出工艺条件实验及与氰化浸出的对比实验，取得了较理想的实验结果：浸出4h金浸出率达到95％，氰化法直接浸出12h金浸出率80％；碘化法浸金速度快，金浸出率高。     

高碘对小鼠脑发育的及血清游离甲状腺激素水平的影响

为了解高碘对机体脑发育及代谢的影响，本实验用高碘水喂养小鼠复制出高碘甲状腺肿动物模型。结果发现，用高碘水喂养小鼠２１０天后，高碘组小鼠体重减轻，甲状腺重量明显增加，血清ＦＴ３及ＦＴ４水平均显著高于适碘组。两组比较脑重、脑ＤＮＡ、蛋白质含量均无显著差异。揭示高碘不影脑发展但可使代谢率增加．     

延安地区140名8—10岁学生尿碘分析

抽样测定延安地区１２所小学１４０名小学生尿碘。结果１２所小学中，学生尿碘的中位数＜１００μｇ／Ｌ者５所，占４１．６７％；１４０名学生中，尿碘≤２０μｇ／Ｌ者１８人，占１２．９０％；尤以未供碘盐的吴旗县金佛坪学生尿碘中位数最低（８．１２μｇ／Ｌ），≤２０μｇ／Ｌ者所占比重最大（１００％）；各校学生尿碘中位数大小不等，频数分布不完全相同；同一学校学生尿碘的个体质差异悬殊。推测该地区仍有部分人群碘营养摄入不足     

用同位素交换法测玫瑰红中含碘量

用同位素交换法测玫瑰红中含碘量李太华，吴江（北京师范大学化学系，１００８７５，北京；第一作者５４岁，男，副研究员）关键词玫瑰红；同位素交换反应；均相体系；非均相体系分类号Ｏ６４３．１４实验中使用的玫瑰红和Ｎ１３１Ｉ溶液由中国科学院北京原子能研究所提供...     

新法从海带中提取碘

以亚硝酸盐作氧化剂，采用萃取法，能快速、有效地从海带中提取碘．     

新型碘铁手印显现方法的实践性研究

依据碘单质和金属铁在有水作催化剂条件下发生反应，放出大量的热，从而使多余的碘升华的原理，对司法实践中常见的几种客体上的新鲜汗潜手印进行显现固定。碘铁手印显现法具有以下优点：反应匀速进行；不会瞬间产生大量的碘蒸气而使熏显过度；显现的纹线清晰连贯。通过选择合适的配比，即当碘与铁物质的量的比为1∶1(碘为15.68 g、铁为3.46 g)时，加入0.40 mL蒸馏水时，获得了最佳显现效果。相比于传统加热碘熏法和碘锌手印显现法，碘铁手印显现法显现效果优、稳定性好，在常温下有些客体上显现的手印能够保存一周不褪色。该方法适用于司法实践中常见渗透性及非渗透性客体上汗潜手印的显现。     

液态碲碘化合物结构的分子动力学模拟

利用分子动力学方法模拟液态碲碘化合物Te1-xIx的结构随着原子浓度的变化而改变．研究结果表明随着碲原子的浓度的增加，液态碲碘化合物经历了由非金属性到金属性的转变，其转变发生在Te0.6I0.4到Te0.8I0.2；偏配位数NTeTe，NTeI，NITe和NII在富碘、富碲的一侧有不同的变化规律．配位数、角分布函数和原子快照的分析显示随着碘原子浓度的增加，液态碲碘化合物Te1-xIx经历了由类似于液态碲的链状结构到类似于液态TeI4结构的转变．     

尿碘测定方法的改进

根据国标法尿碘砷铈催化分光光度法原理，在保持反应温度和试剂浓度不变的条件下，将Ｃｅ４＋在碘催化作用下变成Ｃｅ３＋的反应时间由原来的１５ｍｉｎ改为１０ｍｉｎ，使得尿碘测定的线性范围由原来的０～３００μｇ／Ｌ拓宽至０～４５０μｇ／Ｌ，而试样体积（０．２ｍＬ）和方法的最低检出浓度（６μｇ／Ｌ）仍与国标法一样．结果表明：改进的尿碘测定法精密度、准确度和重现性均良好，所有实验结果的变异系数不超过５．５％，平均回收率为１０１．３％，经符号检验，其方法与国标法的测定结果之间无显著差异（显著水平为１０％）．可缩短实验时间，减少工作量     

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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