六氯苯污染沉积物的电Fenton法处理

研究了牺牲阳极电Fenton工艺对被六氯苯污染的沉积物进行处理的方法,分析了电Fenton方法对河流沉积物中六氯苯的去除能力,研究了该方法的影响因素,以探索河流沉积物修复的新途径．试验结果显示：以不锈钢片作为电极对模拟沉积物进行电Fenton处理,在外加电压15V、初始pH值为3的条件下,2h处理后六氯苯的去除率可达56．7％。     

六氯苯厌氧降解菌的筛选及其降解能力的研究

为探讨六氯苯在特定环境下的可生物降解性,从武汉某化工厂排水沟底泥中分离出4株能以六氯苯为唯一碳源和能源生长的厌氧降解菌,并对单菌株和混合菌株降解六氯苯的能力进行了比较,发现混合菌株比单菌株对六氯苯有更好的降解能力.同时对混合菌群降解六氯苯的最适条件进行了研究,确定了混合菌群降解六氯苯的最适条件为pH值7.0、温度30℃、六氯苯浓度为3mg.L-1.     

大沽排污河底泥中六氯苯的解吸

为调查大沽排污河底泥中六氯苯(HCB)的污染程度及底泥悬浮后六氯苯的解吸规律,采集了12个站位的表层沉积物样品.经检测,底泥中HCB的最高残留浓度为1315ng/g,全河段底泥HCB的平均残留浓度为240ng/g.在不同温度下进行HCB解吸实验,得到了底泥中HCB的残留比.HCB的释放过程可用快、慢两段一级动力学模型描述,并得出不同温度下的释放动力学参数.结果表明:20℃时,快速和慢速释放部分所占的质量分数ω1和ω2分别为34.1%和65.9%;快速和慢速释放速率常数k1d和k2d分别为0.1253h-1和8.0×10-4h-1.经不同温度下的解吸动力学参数计算,大沽排污河底泥中HCB慢速段的解吸活化焓约为65kJ/mol,说明HCB与疏水性较强的多氯联苯(PCBs)的解吸释放难易度相当。     

环糊精与表面活性剂增效电法修复石油污染土壤*

针对石油污染土壤因石油成分复杂且在水相中溶解度低而难以修复问题,采用了表面活性剂和环糊精增效电动力学修复技术,研究了十二烷基苯磺酸钠表面活性剂和β-环糊精单独添加及联合添加时对电动力学修复石油污染土壤的影响,分析了表面活性剂和环糊精增效电动力学作用下土壤中污染石油的迁移机理。结果表明:在电动力学效应中,电渗析作用是石油污染物迁移的主要动力,石油去除率达到45%以上。十二烷基苯磺酸钠和β-环糊精都可以增加石油的溶解性,提高石油的迁移。但是二者各有优缺点,二者的混合液作为石油的增溶剂是最佳选择,使电动力学作用下土壤去油率最高达85.2%。     

环糊精与表面活性剂增效电动力学法修复石油污染土壤

针对石油污染土壤因石油成分复杂且在水相中溶解度低而难以修复问题,采用了表面活性剂和环糊精增效电动力学修复技术,研究了十二烷基苯磺酸钠表面活性剂和β-环糊精单独添加及联合添加时对电动力学修复石油污染土壤的影响,分析了表面活性剂和环糊精增效电动力学作用下土壤中污染石油的迁移机理。结果表明:在电动力学效应中,电渗析作用是石油污染物迁移的主要动力,石油去除率达到45%以上。十二烷基苯磺酸钠和β-环糊精都可以增加石油的溶解性,提高石油的迁移。但是二者各有优缺点,二者的混合液作为石油的增溶剂是最佳选择,使电动力学作用下土壤去油率最高达85.2%。     

蟹塘底泥中重金属的生态风险评估及其植物修复

水体底泥污染是一个世界性环境问题.为了研究养殖水体底泥中重金属的生态风险以及植物修复,通过测定养蟹塘底泥中Cr、Cu、Zn、As、Cd、Pb的含量,用Hakanson提出的潜在生态危害指数法对养殖水体底泥中重金属的潜在生态风险进行了评价;同时对养殖螃蟹体内的重金属含量进行对比分析.另外,通过冬麦草对底泥中的重金属进行植物修复,研究冬麦草富集重金属的能力.研究发现养殖塘底泥中Cd的生态风险最高,其它重金属均显示具有轻微的生态风险.底泥中6种重金属总的潜在生态风险按照不同的参照标准显示为轻微或中等程度.螃蟹体内的Cr、As含量较高,且冬麦草对底泥中Cr、As的去除效果最好.     

污染底泥原位覆盖控制技术研究进展

原位覆盖控制技术是一种新兴的污染底泥修复技术,它与传统的底泥修复技术相比具有较好的修复效果、更小的生态风险和更低廉的成本,引起了广泛的关注.针对原位覆盖控制技术的研究及应用情况进行概述,并就其在我国的应用前景进行分析.     

污染底泥原位覆盖控制技术研究进展

原位覆盖控制技术是一种新兴的污染底泥修复技术,它与传统的底泥修复技术相比具有较好的修复效果、更小的生态风险和更低廉的成本,引起了广泛的关注.针对原位覆盖控制技术的研究及应用情况进行概述,并就其在我国的应用前景进行分析.     

河道底泥处理及资源化利用研究进展

针对河湖泥底污染及其处理问题,分别介绍了底泥污染的危害及其原位修复技术与异位修复技术,分析了原位修复技术及其异位处理后的各项资源化利用技术的优点、缺点和适用性,为我国河湖底泥的修复及进一步的资源化利用提供参考.     

六氯苯污染水体的零价铁修复

为有效控制六氯苯污染水体对生态环境的影响,分析零价铁修复HCB污染水体的可行性,探讨各影响因素的作用机制.研究结果表明:随着反应时间延长,HCB去除率增加;反应体系的最佳初始pH值范围为3~6,最佳点在4.5左右;增加零价铁的投加量有利于HCB去除率的提高,但是当投加量大于35 mg后,HCB去除率增势不十分显著;反应体系的温度在20~30℃之间时对HCB去除效果影响不大.反应动力学研究表明,HCB去除速率对于HCB的物质的量浓度为一级反应,其反应速率常数K为-0.013 5 min-1.该方法设备简单,易于下一步实现工业放大,是一种有较好开发前景的污染水体修复工艺.     

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