铝电解用SnO_2基惰性阳极的研究

所研制的电极在电解温度下的电阻率为(0.6～1.4)×10~(-3)Ω·cm,比碳素阳极低得多,腐蚀速率为(0.5～3)×10~(-3)g/cm~2·h,在0.6～1.0A/cm~2的范围内析氧超电压为0.1～0.2V,小型电解实验的电流效率为86%～88%。本文还讨论了SnO_2基惰性阳极在工业上应用的前景及经济性问题。     

含锡钨硅酸盐异构体的形成、结构和化学性质

合成了一种未见报道的β-型含锡钨硅酸盐K_5SiSnW_(11)O_(30)(OH)·12H_2O。经x射线粉末衍射并指标化,结果表明,该晶体属于正交晶系,a=19.1605,b=16.5783,c=12.5652,α=β=γ=90.00°,V=3991.33~3,D_(obs)=5.31g/cm~3,D_(calc)=5.36g/cm~3,Z=4,与β-K_4SiW_(12)O_(40)·9H_2O同形。经IR、UV、DTA、TG表征,证实它跟属于六方晶系的α-K_5SiSnW_(11)O_(39)(OH)·17H_2O有区别,是一种β-Kenggin型几何异构体。     

间磺酸基偶氮氯膦与重铬酸根离子褪色反应的研究

系统研究了间磺酸基偶氮氯膦与Cr_2O_7~(2-)离子褪色反应的最佳条件,并应用于钢铁样品和水样中铬的测定,本方法的精密度、准确度高,结果表明:表观摩尔吸光系数ε_(580nm)=2.8×10~4dm~3·mol~(-1)·cm~(-1),Cr(Ⅵ)量在0～0.8μg·cm~(-3)范围之内服从比尔定律。     

镓的高灵敏显色反应(Ga(Ⅲ)-BPR-Tween80-CTAB体系)

本文研究了高灵敏的Ga(Ⅲ)-BPR-Tween80-CTAB体系。该体系的适宜酸度为pH2.87～3.42。最大吸收在528nm。锌量在0.1～1.0μg/25ml范围遵守比耳定律。当Tween80在高浓度(0.8％)时,ε=5.72×10~5l·mol~(-1)·cm~(-1);当Twnne80在低浓度(0.24％)并辅以少量H_2O_2(浓度为4.8×10~(-3)％)时,ε=1.09×10~6l·mol~(-1)·cm~(-1)。镓在6mol/l盐酸介质中用乙酸丁酯萃取分离后,测定了分子筛型催化剂中的镓含量。     

三聚磷酸二氢铁的制备、性能及应用研究

本文以Fe_2O_3或Fe(OH)_3为原料与H_3PO_4(85％)反应,经中和、溶解和聚合,当P_2O_5/Fe_2O_3(R)≥5,T=250～280℃时,得非晶态三聚磷酸二氢铁(FeH_2P_3O_(10)·2H_2O),T>280℃时,得结晶态的FeH_2P_3O_(10)·2H_2O。FeH_2P_3O_(10)·2H_2O的脱水过程为, FeH_2P_3O_(10)·2H_2O是很好的无毒防锈颜料。     

利用固体电解质在CaCl_2熔盐中电解固态SiO_2制备Si

通过对固态SiO_2的理论分解电压进行计算,比较分析了惰性阳极和炭阳极条件下SiO_2电解还原的特点。利用ZrO_2(Y_2O_3)固体电解质管集成构建以Pt,O_2(Ar)|ZrO_2(Y_2O_3)为参比电极的三电极电解池,研究了惰性阳极条件下在CaCl_2熔盐中电解固态SiO_2阴极绿色制备Si的可行性。理论计算结果表明,SiO_2在惰性阳极条件下进行电解还原相比使用炭阳极时难度较大,降低气相中的氧分压有利于SiO_2的电解还原。实验结果表明,在惰性阳极条件下借助三电极电解池电解SiO_2可以成功制备Si,相应电解过程可用三相界线反应机制进行解释。     

Cu-Ni-Al惰性金属阳极铝电解应用测试

采用Cu Ni Al合金作金属阳极 ,在温度 75 0～ 85 0℃ ,电流密度 0 75～ 1 1 0A/cm2 的不同分子比和氧化铝质量分数的Na3 AlF6 NaCl CaF2 Al2 O3 熔盐中进行电解测试·结果表明 ,在不同电解操作条件下该阳极材料的腐蚀程度不一样 ,阳极在熔盐中的腐蚀速率远大于在空气中的氧化腐蚀速率 ,而且阳极电解的腐蚀速率与电解质中的氧化铝质量分数相关 ,氧化铝质量分数大 ,则阳极腐蚀速率小·另外 ,与碳阳极相似的是在高电流密度下腐蚀速率反而小·该材料是一种可开发的惰性阳极材料     

藏红T新分光光度法测定水中微量亚硝酸盐氮

藏红T与亚硝酸根在0.1mol/l的盐酸溶液中可形成红色配合物,在600nm处有最大吸收。ε600nm=7.39×10~3l·mol~(-1)·cm~(-1),桑德尔灵敏度为9.34×10~(-3)μg/cm~2。亚硝酸盐氮含量在0～3μg/ml范围内遵守比尔定律。显色液在室温下避光放置可稳定6小时以上。亚硝酸盐氮含量为2μg/ml时,11次平行测定的标准偏差为1.14×10~(-3),相对标准偏差为0.22％,该方法用于湖水、河水、污水等水样中亚硝酸盐氮的分析,获得满意的结果。     

钙传感法对铁液中溶解态钙活度的研究

用直接合成法制备了Caβ″-Al_2O_3 固体电解质,在10~(-2)～1 MHz 频率范围内,于 1073～1523 K 温度区间测定了电解质的阻抗谱,并计算得到电导率,其数量级为 10~(-6) ～10~(-5)Ω~(-1)·cm~(-1)。用Caβ″-Al_2O_3 作为固体电解质,以Sn-Ca 合金为参比电极,组装成电池 Mo|Sn-Ca|Caβ″-Al_2O_3|[Ca]_(Fe)|Mo(ZrO_2),于 1833 K 温度下测定了纯铁液中溶解态钙的活度,证明该种固体电解质有希望用于直接测定钙的活度。     

催化褪色光度法测定痕量铁——Fe(Ⅲ)——百里香酚蓝——H_2O_2体系

本文研究了Fe(Ⅲ)离子对H_2O_2氧化百里香酚蓝褪色反应的催化效应及其动力学条件,从而建立了痕量铁的催化光度法。本法测定范围为0-1.4μg/25cm~3,检出限为7.5×10~(-9)g/cm~3。具有较好的选择性和重现性,用该法测定了人发及水样中的痕量铁,结果令人满意。     

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