活性炭—H202催化氧化处理氨基C酸工业废水的研究

研究了活性炭—H2O2催化氧化处理氨基C酸工业废水的氧化脱色效果，活性炭兼具吸附和催化双重作用．试验结果表明，在pH＝1．0，氧化剂的用量为H2O2/废水＝50mL/L，催化剂的用量为活性炭/H2O2＝0．5—0．75g／mL时，废水的CODcr去除率可达62.4％，脱色率达到94.6％．显示了该法处理氨基C酸工业废水良好的氧化脱色效果．     

制药废水预处理试验研究

采用活性炭、H2O2和硫酸铝相结合的吸附—催化氧化—絮凝法联合处理某制药厂废水。考察了活性炭用量、H2O2用量和絮凝剂用量对COD去除率的影响。实验结果表明,废水pH为4,反应90min后,絮凝实验调pH为7的条件下,H2O2加入量为16.7mL/L、活性炭投加量为10g/L,硫酸铝溶液用量283mL/L进行絮凝沉淀,效果最佳,废水COD去除率达到50%以上。     

催化氧化氨基C酸染料中间体废水的研究

研究了Cu/r-Al2O3单组分催化剂和Ni-Zn/r-Al2O3双组分催化剂两种催化氧化体系.通过对废水pH、反应时间、ClO2投加量、催化剂投加量、初始浓度等工艺条件的考察,确定Ni-Zn/r-Al2O3催化氧化处理氨基C酸染料中间体模拟废水的最佳工艺条件:初始pH,ClO2投加量10 mL,催化剂投加量3.0 g,反应20 min.在该条件下,COD和浓度去除率分别为65.2%和86.5%,为该工艺处理氨基C酸工业废水提供了实验依据.     

微波-H_2O_2-活性炭协同催化氧化处理苯酚废水

采用微波、H2O2和活性炭协同催化氧化法处理苯酚废水,探讨各种因素协同作用以及对苯酚废水处理效果的影响.结果表明,微波-H2O2-活性炭氧化体系能高效快速降解废水中苯酚,100 mL初始pH为5、质量浓度为100 mg/L的苯酚废水中,在活性炭3 g、微波辐射18 min、微波辐射功率200 W、H2O2质量浓度1.5 g/L的最佳处理工艺条件下,苯酚去除率达98.5%.     

活性炭-Fenton预处理垃圾渗滤液的研究

以颗粒活性炭为催化剂,建立活性炭-Fenton催化氧化体系,对垃圾渗滤液进行有效处理,分别考察了反应时间、pH、活性炭用量、硫酸亚铁用量和H2O2用量对废水处理效果的影响,结果表明:在反应时间为30 min、pH为3、活性炭用量20 g/L、硫酸亚铁用量0.02 mol/L和H2O2用量2 mL/L的条件下,可使废水的COD从3 000 mg/L降至1 552.2 mg/L, COD去除率达到48.26%.     

Fenton氧化-活性炭吸附组合处理印染废水的研究

对Fenton氧化-活性炭吸附组和处理印染废水进行了研究。利用正交实验确定了单独Fenton氧化处理印染废水的最佳条件：Fe2＋：0.05g/L;H2O2：40mL·L-1;处理时间40min;pH值3,脱色率为72.1%。考察了活性炭投加量、pH值、处理时间等因素对活性炭吸附效果的影响,结果表明,活性炭吸附处理印染废水的最佳条件：活性炭投加量0.4g·L-1;处理时间40min;pH值2～3,脱色率为69.2%。在Fenton氧化和活性炭吸附的最佳处理条件下进行三种不同组合方式处理印染废水,以二者同时进行处理的方式最佳,脱色率可达90%以上。活性炭对Fenton氧化具有一定的催化作用,二者组合处理印染废水具有较好的脱色效果。     

内电解法联合H2O2处理废水的试验研究

将内电解法与H2O2氧化联合起来应用于废水处理,着重考虑了pH值、H2O2用量以及反应时间对COD去除率的影响规律,并比较了H2O2的投加顺序对废水COD去除率的影响差异.结果表明,废水pH=6.81,经内电解柱处理后出水,调节pH=4.0后,投加0.4~0.5mL/L的H2O2,反应1h后,COD去除率可达95.5%,说明内电解配合H2O2处理废水效果更佳.     

膨润土吸附-微波催化氧化处理番茄酱生产废水的研究

采用膨润土吸附-微波催化氧化技术处理番茄酱生产废水,考察了膨润土添加量、H2O2用量、辐射时间以及微波功率对废水处理效果的影响.确定微波催化氧化的条件是:微波功率650 W、辐射时间13 min、H2O2用量0.21 mL、膨润土用量1.1 g/L.在此条件下对废水进行处理,处理时间由2 h缩短为13 min,废水的COD和TOC去除率分别为84.8 %和80.1 %.     

过氧化氢氧化法处理糖蜜酒精蒸馏废水初探

采用H2 O2 -Fe2 + 催化氧化法对糖蜜酒精蒸馏废水进行初步处理试验。结果表明 ,H2 O2 对糖蜜酒精蒸馏废水有较好的氧化降解效果 ,在温度为 30℃ ,催化剂Fe2 + 用量为 0 .46 g·L-1,H2 O2 用量为 41.7g·L-1,废水经过 15h氧化反应后 ,用石灰乳中和调节至 pH =7,废水COD去除率可达 80 %,色度去除率达 94%.     

UV/H2O2/ACF对水中染料靛红的氧化脱色研究

采用紫外杀菌灯(UV)、双氧水(H2O2)和活性炭纤维(ACF)联合技术,对水中染料靛红的氧化脱色进行了研究。考察了溶液初始pH、H2O2用量以及外加Fe3 浓度对UV/H2O2/ACF光解氧化脱色过程的影响,并比较了UV、H2O2、ACF各自在氧化脱色过程的作用。结果表明,UV/H2O2/ACF是一种脱除水中靛红颜色的有效方法,在靛红初始质量浓度0ρ=50 mg/L,pH=6,ρ(H2O2)=200 mg/L条件下,经60 min的光解反应,脱色率达到98.7%。添加Fe3 离子,降低溶液初始pH,可提高颜色脱除效果。     

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.     

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     

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.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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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。