AEHPA从稀硫酸溶液中萃取铁的研究

该文研究了烷左膦酸单－２－乙基己酯从稀硫酸溶液中萃取铁伯机理和萃取平衡时间，并通过紫外可见光谱和红外光谱分析，推断了萃合物可能的分子结构，研究表明，萃取机理与溶液中铁离子的存在形式有关，Ｆｅ＾３＋、Ｆｅ（ＳＯ４）２＾－和Ｆｅ２（ＯＨ）４＾２＋皆可参与萃取。当ｐＨ值小于１．５，铁离子浓度不大于０．０１ｍｏｌ／Ｌ时，主要为Ｆｅ＾３＋，Ｆｅ（ＳＯ４）２＾－参与的２种萃取机理，萃取平衡时间分别约为１０ｍｉ     

痕量铁的在线监测研究

根据在邻菲罗啉的活化下Ｆｅ３＋对ＫＩＯ４氧化罗丹明Ｂ褪色的催化作用，利用流动注射技术，建立了一个痕量铁的在线监测的新方法．该方法Ｆｅ３＋的浓度在０～８×１０－５ｇ／Ｌ和８×１０－５～２．８×１０－４ｇ／Ｌ范围内分段与褪色效应呈良好线性相关，检出限为：１×１０－７ｇ／ＬＦｅ３＋（３δ）；ＲＳＤ≤１．６％（ｃ＝５×１０－５ｇ／Ｌ，ｎ＝１１）．利用该方法对水样中铁进行在线监测，效果满意     

用硫酸铁──硫酸作浸取剂从闪锌矿制备七水合硫酸锌

本文介绍了用硫酸铁－硫酸作浸取剂，从闪锌矿制备七水硫酸锌的工艺过程。用铁屑作中和剂和还原剂除去浸取液中的酸和未反应的Ｆｅ￣（３＋），从溶液中结晶出大部分ＦｅＳＯ＿４·７Ｈ＿２Ｏ后，用“针铁矿”法除去剩余的Ｆｅ￣（２＋），用四氯乙烯作萃取剂回收渣中的硫。     

均匀纺锤形α—FeOOH微晶制备过程

在过程分析的基础上，以Ｎａ２ＣＯ３作为沉淀剂，在ＦｅＳＯ４溶液中形成Ｆｅ（ＯＨ）２－ＦｅＣＯ３沉淀，通入空气氧化制备了均匀纺锤形α－ＦｅＯＯＨ微晶。研究了碱比、通气量、温度、浓度、搅拌转速以及加料方式等对制备过程以及纺缍形铁黄形态的影响规律，并制备出粒度为０．２μｍ，轴比为３～４，均匀、无枝杈的纺锤形α－ＦｅＯＯＨ粒子。实验验证了该过程为传质控制。     

铅化合物体外诱导人的淋巴细胞DNA损伤的遗传毒性

在体外对人的淋巴细胞，用不同浓度的硝酸铅Ｐｂ（ＮＯ３）２和硫酸铅ＰｂＳＯ４处理１小时，ＤＮＡ损伤的程度采用单细胞琼脂糖凝胶电泳技术进行比较研究．这两种铅化物均不同程度的显示了剂量反应关系．ＤＮＡ损伤的程度从８×１０－４ｍｏｌ／Ｌ起与空白对照相比，呈现有意义的增加（ｐ＜０．０５）．细胞ＤＮＡ断裂频率的增加与毒性呈现为线性增长的关系即为试验试剂的浓度愈高，则出现彗尾的细胞个数愈多，两种化合物在同样的实验条件下显示了相似的分裂剂的潜能．该试验初步证明铅化合物具有一定的遗传毒性     

高d33.g33值PZT压电陶瓷材料中Sb2O3掺杂的作用

Ｓｂ２Ｏ３对Ｐｂ（Ｚｒ０．５４Ｔｉ０．４６）Ｏ３的掺杂改性具有调整材料四方度（ｃ／ａ）的作用．实验表明，Ｓｂ２Ｏ３的适量添加可使材料四方度的调整达到一个较佳值，从而得到ｄ３３＝５７０×１０－１２Ｃ／Ｎ、ｇ３３＝３２×１０－３Ｖｍ／Ｎ的高压电活性的材料组成．该材料可获得各种重要应用     

Cl-、NO3-和SO42-离子对漆酶催化活性的抑制作用

以５,６－二溴－２,３－二氰基氢醌为底物,在ｐＨ值４．５０条件下,用分光光度法考察了Ｃｌ－、ＮＯ－３和ＳＯ２－４离子对漆酶催化活性的影响。发现Ｃｌ－、ＮＯ－３和ＳＯ２－４离子对漆酶的催化活性均有不同程度的抑制作用,其最大抑制率分别可达７５％、３１．４％和１７．１％。动力学研究表明,Ｃｌ－、ＮＯ－３和ＳＯ２－４离子的抑制作用是瞬时完成的,属于竞争性抑制过程,是通过与底物分子竞争漆酶分子中的Ⅱ型铜（Ⅱ）部位实现的。经测定,Ｃｌ－和ＮＯ－３离子与漆酶所形成的复合物其解离常数分别为１．１２×１０－４ｍｏｌ·ｄｍ－３和１．７８×１０－３ｍｏｌ·ｄｍ－３。     

复合碱式氯化铝混凝剂的合成及其性能

在盐酸直接酸浸铝矾土制碱式氯化铝的基础上,聚合一定量的Ｆｅ＾３＋和ＳＯ４＾２－,合成复合型碱式氯化铝,其Ａｌ２Ｏ３含量为１０．２％￣１０．８％,Ｆｅ２Ｏ３含量为２．８％￣４．０％,盐基度含量为６４％￣７５％,硫酸根的含量小于３．５％。红外光谱分析和电镜观察结果表明,该复合型碱式氯化铝是一种含多核聚铁及聚铝与氯离子及硫酸根配位的新型无机高分子混凝剂。     

钛和锆钨硅杂多酸盐异构体的合成及表征

合成了α－和β－Ｍ１０－ｎＨｎ〔ＳｉＷ９Ｔｉ３Ｏ４０〕·ｘＨ２Ｏ（Ｍ＝Ｋ＋、Ｍｅ４Ｎ＋），α－（Ｍｅ４Ｎ）４Ｈ２〔ＳｉＷ１１ＺｒＯ４０〕·１３Ｈ２Ｏ和β－（Ｂｕ４Ｎ）４Ｈ２〔ＳｉＷ１１ｚｒＯ４０〕·１４Ｈ２Ｏ等杂多酸盐异构体。并用ＩＲ，ＵＶ，ＴＧ和ＤＴＡ、极谱以及Ｘ－射线粉末衍射等手段进行了表征。     

氮素形态及配比与大白菜体内硝酸盐的积累

水培结果表明：氮素用量为２１０．６ｍｇ／ｌ时，随ＮＯ３－Ｎ浓度的降低和ＮＨ４－Ｎ浓度的增加，地上干重显著降低，抑制体内硝酸盐、Ｋ、Ｍｇ、Ｃｕ的积累．有利于Ｆｅ、Ｚｎ的积累。随ＮＯ３－Ｎ浓度的降低和ＣＯ（ＮＨ２）２－Ｎ浓度的增加，地上干重有明显的单峰值，抑制体内硝酸盐、Ｍｇ、Ｍｎ的积累，有利于Ｆｅ的积累。在ＮＯ３－Ｎ：ＣＯ（ＮＨ２）－Ｎ为５０：５０（％）时，地上干重最大，并且硝酸盐含量符合绿色大白菜的基本规格。     

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     

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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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has