膨润土端面电荷改性研究

进行了几种碳酸盐，氢氧化物和硅溶胶改变钙质膨润土端面电荷实验，研究了改性土的结离子吸附性能及介质ｐＨ值和土的结晶度对硅溶胶改性时，土的结晶度对改性膨润土吸附性能有显著影响。     

膨润土改性及其在印染废水处理中的应用

采用硫酸和CTMAB对膨润土进行活化改性处理,研究了改性膨润土对印染废水处理效果及影响因素.结果表明：改性膨润土对印染废水的处理能力明显增强,吸附时间、温度、pH值和膨润土用量是影响吸附效果的主要因素,改性膨润土对印染废水的吸附规律较好符合Freundlich吸附等温式.     

改性膨润土对废水中硫化物的吸附及再生研究

采用微波辐射技术和盐酸对膨润土进行活化改性处理,研究了改性膨润土对废水中硫化物的吸附性能.实验结果表明,改性膨润土对硫化物的吸附能力明显增强.吸附时间、温度、pH值和膨润土用量是影响吸附的主要因素.改性膨润土对硫化物的吸附规律较好地符合Freundlich吸附等温式.采用30%双氧水作为膨润土的再生剂,可使其再生重复使用.     

膨润土改性及其在有机废水处理中的应用

膨润土是一种天然的吸附材料,有较大的比表面积与优良的离子交换能力,对废水中的有机污染物有良好的吸附性能;介绍了膨润土的组成、特性和常见改性方法,综述了膨润土与改性膨润土在处理有机物废水中的应用及发展前景。     

改性膨润土对印染废水中染料的吸附效果研究

膨润土是一种层状结构的硅酸盐粘土矿物,由于其结构特征具有良好的吸附性能。采用高温焙烧和铝盐活化法对膨润土进行改性处理,以甲基橙染料模拟印染废水,通过控制温度、PH、改性膨润土的用量变量的方法,确定最佳处理甲基橙的用量和条件。当其他条件一定时,改性膨润土对甲基橙吸附能力明显高于原土的吸附能力,投加量在20g/L-25g/L,温度为20℃-40℃,PH值为6.0-8.0,处理时间为10-15min时,处理效果良好,具有一定的推广实践价值。     

有机改性膨润土对水中苯酚的吸附性能

采用自制有机改性膨润土对水中苯酚进行吸附研究, 探讨了吸附时间、 吸附溶液的pH值、 吸附溶液浓度等因素对吸附效果的影响. 结果表明, 改性后的有机膨润土能有效吸附水中的苯酚, 有机改性膨润土改善了其微观结构, 提高了膨润土的吸附能力和离子交换能力.     

膨润土及其碱熔活化产物对锶的吸附行为

以膨润土为主要原料,碱熔制备A沸石,结合静态吸附实验,研究膨润土、A沸石对溶液中锶的吸附以及吸附过程中动力学和热力学. 结果表明,膨润土、沸石对Sr2+的吸附能力受初始浓度影响,膨润土、沸石在吸附过程中的规律趋势大致相同. 膨润土和沸石对Sr2+的等温吸附过程符合Langmuir等温吸附模型,吸附机制为单分子层的阳离子交换吸附.膨润土和沸石对Sr2+的吸附机制相似,其动力学吸附过程为化学反应控制的拟二级动力学吸附过程. 对吸附前后的膨润土、沸石进行XRD、SEM表征分析,膨润土、沸石在酸性溶液中进行吸附不会对自身骨架结构产生严重破坏或影响. A沸石对Sr2+的吸附量约为膨润土的3.9倍,表现出比膨润土更优秀的吸附能力.     

温度对Pu在膨润土中吸附的影响及热力学研究

通过静态吸附实验,探讨了高庙子膨润土、钙基膨润土、钠基膨润土和漂白土分别在293.15K、313.15K、333.15K条件下,不同钚浓度对膨润土吸附的影响,以及膨润土对钚吸附的相关热力学参数进行计算。结果表明：随着钚浓度的增大,膨润土吸附能力不断增大,但一定浓度后,吸附达到饱和;四种膨润土均很到的符合Freundlich等温吸附模型;通过计算热力学参数G、S和H,得出钚吸附是一个吸热自发的过程;四种膨润土的吸附能力由大到小是：钙基膨润土>高庙子膨润土>漂白土>钠基膨润土。     

改性膨润土处理含铅废水的实验研究

对用酸改性的膨润土处理含铅废水进行了实验.并研究了改性膨润土在不同条件下对含Pb2 废水的处理能力.结果表明:膨润土用量为10 g·L-1,pH 9,反应温度25°,吸附时间20 min,改性膨润土对Pb2 的去除率可达99.6%.处理后铅的剩余浓度达国家第一类污染物排放标准.     

PDMDAAC-阳离子膨润土性能的研究

以工业聚二甲基二烯丙基氯化钱（PDMDAAC）和钠基膨润土为原料制备了PDMDAAC-阳离子膨润土，研究了PDMDAAC在膨润土上的吸附行为，探讨了改性前后膨润土的电性情况，利用透射电镜和X射线衍射观察丁膨润土改性前后的形貌变化和层间距的变化，最后用阳离子膨润土处理实际印染废水，实验了阳离子膨润土处理印染废水的效果．结果表明。PDMDAZC在膨润土上的吸附属于Langmuir吸附，同时也符合Freundlich吸附，改性前后膨润士的电性、形貌和层间距都发生了变化，处理废水的实验表明，阳离子膨润土对印染废水的脱色效果较好，对COD也有一定的去除率．     

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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