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．     

铁屑内电解法处理印染废水研究

本实验利用铁屑内电解法处理印染废水,探讨了体系,ｐＨ值与停留时间对处理效果的影响。结果表明：经处理后印染废水的脱色率达９５％以上,ＣＯＤ去除率达７５％以上,适用于印染废水的处理或预处理。『     

微电解在处理印染废水中的应用研究

研究了微电解技术在处理印染废水中的应用，采用正交实验确定了最佳的实验条件．实验结果表明，通过微电解能够去除印染废水中50％以上的COD，同时可以将BOD／COD从0．3左右提高到0．5．     

混凝法处理高浓度印染废水的研究

选用ＭｇＳＯ＿４作为混凝剂处理高浓度印染废水，并与ＰＡＣ作为混凝剂对比试验．用正交试验确定其处理的最佳条件，再在此条件下处理混合印染废水，研究表明：用ＭｇＳＯ＿４处理废水的最佳ｐＨ值在１２左右，ＣＯＤ＿ｃｒ去除率达８０％以上，脱色率达９０％以上，较ＰＡＣ脱色率和ＣＯＤ去除率高，可望成为处理印染废水的新型混凝剂．     

腐钠处理染色废水研究

腐植酸系交换剂在处理工业废水中对染色污染物的除去率比较高，且工艺简便，成本低。本实验是针对印染废水用腐植酸钠和铝盐为絮凝剂进行处理的，着重讨论了腐植酸钠和铝盐的用量及废水的PH值对COD除去率的影响。发现此法有较高净化效率。为推广到工业处理废水提供了实验依据，技术上是可行的。     

用粉煤灰处理印染废水的研究

介绍用粉煤灰对毛纺厂的印染废水进行处理的方法,寻找到最佳的处理条件和添加剂,使印染废水的脱色率达９５％以上,ＣＯＤｃｒ去除率达到９６．２％,并对其机理进行了初步探讨。     

铁屑电化学法处理印染废水的研究

利用铁屑在水溶液中腐蚀形成微电池的原理处理印染废水。实验结果表明:COD去除率达50％～75％;脱色率达95％以上;色度可达到国家排放标准。该项处理工艺具有设备简单、操作管理方便、投资省、占地少、运行费用低等优点。该处理方法可望在印染废水处理中得到广泛应用。     

印染废水的光催化氧化处理新进展

介绍了光催化氧化处理印染废水的作用机理，通过对印染废水的综合分析，指出印染废水的光催化氧化处理的影响因素，以及现有处理印染废水的方法，并对光催化处理印染废水的主要问题进行了探讨，为实际印染废水中有机物的降解提供研究依据。     

利用半导体光催化剂Bi_2O_3处理印染废水的研究

本文利用半导体光催化剂三氧化二铋对印染废水的处理进行了研究,并讨论了光催化剂用量、试液PH、光照时间与印染废水的COD、色度去除率之间的关系。实验结果表明:在最佳条件下,光照8小时,印染废水的COD、色度去除率分别达到42.7％、50.0％。     

不同超滤膜深度处理印染废水试验研究

随着我国超滤膜材料的开发、膜制造技术．的日益成熟和膜清洗方法的不断改进，超滤膜因为其高效经济的集成化工艺、构筑物占地面积小、投资运行费用低，分离过程简单、投资费用和能耗低等特点，逐步替代了传统的常规印染废水深度处理技术，在印染废水深度处理中得到了越来越广泛的应用。实验采用不同规格和材料的超滤膜进行染整二级尾水分离实验，对比分析了污染前后膜面的接触角以及不同切割分子量对膜通量及出水水质的影响，对超滤膜的污染机理进行了初步研究，分别对三种膜聚醚（PES）膜、膜聚砜（PSF）、膜和聚醚酰亚胺（PEI）膜的结果及使用性得到了相应分析结果。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

英文诗歌中的喻类修辞

为了有助于提高英文爱好者的个人情操、文化素养和学习兴趣,以及专业人员对英语学习和研究进行多途径的探索,本文通过一些精选诗歌的引证和分析,着重论述了喻类修辞法在英文诗歌中的运用其及效果。     

Man Is Unable to Change the Miserable Life——Analysis of the Arrangement of Four Characters in The Glass Menagerie

Tennessee Williams is considered as one of the most important American playwrights since World War II.The Glass Menagerie is his first successful drama,which describes a tragic situation of family and means to say that Man is unable to change the miserable life,no matter whatever means he try,This essay focuses on the analysis of the arrangement of the four main characters:Laura.Amanda,Jim and Tom to reveal the theme.Laura is fragile.Amanda is brave.Jim is vital.Tom is sensible.And all of them develop and try the different means to struggle against life,but fail tragically.With the evidence,the paper comes to conclusion naturally that Man is unable to change the miserable life,and he dooms to fail.     

Characterization of root-nodulating bacteria on Retama raetam in arid Tunisian soils

The aim of this study is to investigate the diversity of Retama raetam root-nodule bacteria isolated from arid regions of Tunisia. Twelve isolates, chosen as representative for different 16S rRNA gene patterns, were characterized by 16S rRNA gene sequencing and phenotypic analysis. Isolates were assigned to Sinorhizobium, Rhizobium and Agrobacterium. Symbiotic properties of Sinorhizobium and Rhizobium isolates showed a large diversity in their capacity to infect their host plant and fix atmospheric nitrogen. Strain RK 22 identified as Rhizobium was the most effective isolate.     

An Affordable Accurate Evaluation of the Binding Conformations Predicted by Molecular Docking Studies in Bio-System

正Recently,docking has been widely used to predict the binding-modes of protein-inhibitors,when the crystal complexes structure was absent.Most docking algorithms are able to generate a large number of probable conformations,it,however,is difficult to effectively evaluate these docking poses and identify the most reasonable bindingmode.In the present study,on the basis of the crystallographic data of human 3-hydroxy-3-methylglutaryl coenzyme     

WIMAX与WI-FI技术分析及联合组网

介绍了WiMAX与Wi-Fi两种无线宽带接入技术,并对两者之间的关系及相互之间的影响做了对比及分析,并对WiMAX的关键技术进行了详细说明,最后对两者的联合组网方式做了简单的探讨。