冶金级Al（OH）3纯化工艺研究

系统研究了纯化冶金级Al(OH)3的工艺参数，通过对影响碱溶及纯化的因素进行试验，探索出碱溶除去Al(OH)3中晶间碱，获得Na20合量＜0．003％的低钠Al(OH)3的新方法，得出最佳工艺条件．     

由除杂铝渣碱溶碳分制备高纯Al(OH)_3

以红土镍矿酸浸液的除杂铝渣为原料,经碱溶、分步碳分制备高纯Al(OH)3粉体,实验考察了除杂铝渣碱溶温度、碱溶pH值与除杂铝渣中铝溶出率的关系及碳分终点pH值、碳分温度与沉铝率之间的关系.实验得到的适宜碱溶条件为pH值14、温度90℃、时间10 min;碳分条件为碳分终点pH值9、碳分温度75℃.采用XRD,SEM,化学成分分析对所得Al(OH)3粉体进行了表征.结果表明Al(OH)3粉体晶型发育良好,颗粒不规则,表面粗糙,结构松散、多孔.     

长石在压蒸条件下的碱溶出

测试了压蒸条件下两种天然长石在水及饱和Ca(OH)2溶液中碱溶出情况.结果表明长石在水中碱溶出量比较少,溶出的碱主要是钠碱.长石在饱和Ca(OH)2溶液中碱溶出量比较多,溶出的碱包括钠碱和钾碱.集料碱溶出对混凝土碱含量影响比较小.     

官能团化聚丙烯改性Al（OH）3／PP复合材料的力学性能

用溶融挤出法制备了不同接枝率的官能团化聚丙烯（FPP）,研究了FPP对改性的Al(OH)3/PP复合材料的力学性能与断裂形态的影响,并对FPP在复合材料中作用机理进行了初步探讨,观察到随Al(OH)3用量增加,PP的拉伸强度和弯曲强度逐渐降低,断裂伸长率明显降低,FPP加入有利于Al(OH)3/PP复合材料力学性能改善、填料分散和增强填料与基体界面相互作用,尤其在高填料中功效更加明显。     

钾长石焙烧熟料中二氧化硅的溶出

以钾长石碱焙烧熟料为原料,研究熟料中二氧化硅的溶出规律.考察了溶出过程中溶出温度、溶出时间、搅拌强度、熟料粒度和Na OH溶液浓度对Si O2溶出率的影响.利用扫描电镜(SEM)和X射线衍射(XRD)分析仪对熟料和碱溶渣的物相结构和微观形貌进行了表征并分析了溶出过程.通过试验得到适合的溶出条件为:溶出温度95℃、溶出时间80 min、搅拌强度400 r/min、熟料粒度74~89μm、Na OH溶液浓度0.2 mol/L.在此条件下,Si O2溶出率可达到99%.溶出后Na2Si O3进入溶液,K和Al在渣中富集,得到分离.     

碱对钙矾石结晶及溶解性能的影响

主要通过C3A-CaSO4·2H2O,在不同碱性溶液中钙矾石的形成、晶体形貌变化以及制备得到的纯钙矾石在不同碱性溶液中的溶解来研究碱对钙矾石结晶、溶解性能的影响,并采用XRD、SEM以及ICP等分析方法进行表征.研究结果表明,碱对钙矾石的形成有促进作用,还会影响钙矾石晶体形貌.钙矾石在不同碱性溶液中具有不一致溶特性,OH-对钙矾石中Al(OH)4-、Ca2 和SO42-溶出能力具有抑制作用.     

氢氧化镁和氢氧化铝阻燃高密度聚乙烯的研究

Mg(OH)_2、Al(OH)_3是当前正在发展的无毒廉价的阻燃剂,本文利用它们研制无毒阻燃性HDPE。实验结果表明:Mg(OH)_2对HDPE的阻燃效果优于Al(OH)_3,但填充量较少;Mg(OH)_2与Al(OH)_3混合使用时对HDPE具有阻燃协同效应;依赖这种协同效应,用较少量的Mg(OH)_2和较多量的Al(OH)_3混合填充,可获得性能更好的阻燃性HDPE。实验结果还表明:加入少量偶联剂和交联剂DCP,可以提高阻燃性HDPE的拉伸强度。     

铝酸钠溶液中Al(OH)3吸附草酸盐行为研究

通过模拟拜耳法晶种分解过程研究了铝酸钠溶液中Al(OH)₃对草酸盐的吸附平衡和动力学行为,并考察了草酸盐初始浓度和Al(OH)₃粒度对吸附的影响规律. 结果表明:Al(OH)₃对草酸钠有较大的吸附能力,随草酸钠浓度的升高和Al(OH)₃粒度的细化,草酸钠吸附率随之升高,达到平衡的时间也相应缩短;不同粒度Al(OH)₃的吸附能力不同,这跟Al(OH)₃的比表面积有很大关系;Al(OH)₃对草酸钠的等温吸附符合Freundlich模型,吸附动力学符合准二级动力学方程,吸附行为为多分子层吸附,同时存在物理和化学吸附过程.     

Al(OH)3和Mg(OH)2阻燃抑烟剂对软PVC材料性能的影响

对经Al(OH)3和Mg(OH)2阻燃处理的软PVC材料的阻燃抑烟及力学性能进行了研究.选择了合适的偶联剂类型及用量.结果表明:Al(OH)3和Mg(OH)2复配使用是软PVC材料的较为理想的阻燃抑烟剂,硅烷类偶联剂A151和钛酸酯类偶联剂NDZ-311是Al(OH)3和Mg(OH)2阻燃处理的软PVC材料的较理想的偶联剂.     

焙烧态水铝钙石催化合成单硬脂酸甘油酯

以Ca(OH)_2和Al(OH)_3为原料清洁制备焙烧态水铝钙石,采用CO_2程序升温吸脱附法表征其碱强度和碱量,并将其应用于酯交换合成单硬脂酸甘油酯(glycerol monostearate,GMS)。考察了焙烧态水铝钙石的制备条件与酯交换反应条件对合成GMS的影响。结果表明,当原料中Ca/Al摩尔比为2∶1,焙烧温度600℃时,制备的焙烧态水铝钙石的催化性能最优。在优化反应条件下,粗产物中GMS的含量高达80.4%。     

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