水解酸化——SBR组合工艺处理焦化废水

采用水解酸化——SBR工艺处理焦化废水，进水水质为COD1 100mg／L，NH3-N210mg／L时，水解酸化4h，SBR曝气8h，搅拌3h，再曝气4h，沉降1．5h，出水COD68．2mg／L，NH3-N 51．2mg／L，去除率分别达到93.8％，75．6％．     

氧化沟膜生物反应器处理城市污水试验研究

通过小试，研究了氧化沟膜生物反应器对城市污水的处理效果与运行特性．结果表明，在水力停留时间(HRT)为4h，曝气/停曝时间为90min／30min等试验条件下，氧化沟膜生物反应器对城市污水中的DOC，CODc，，NH4-N，T—N和T—P等的平均去除率分别达到75％，90％，95％，80％和50％；氧化沟膜生物反应器具有较强的抗冲击负荷能力，当进水CODCr由265mg／L增加到1000mg／L时，出水CODCr仍能维持在100mg／L以下；在停运30d后，这种膜生物反应器去除有机物的性能在2d内可恢复，去除氨氮的性能在8d内可恢复；在3种膜清洗方法中，化学清洗效果最好，水力清洗效果次之，曝气清洗效果最差．     

厌氧折流板-垂直潜流人工湿地处理农村生活污水的研究

采用厌氧折流板反应器-垂直潜流人工湿地(ABR-SSFW)组合工艺处理农村生活污水.实际运行结果表明:当水力停留时间(HRT)大于12 h时.组合工艺对COD,TN,NH3 -N,TP的平均去除率分别为85.5％,42.8％,34.67％,41.97 ％6;当HRT小于12 h时,组合工艺对COD,TN,NH3-N,TP各项的去除率都有明显下降.在对COD的去除中ABR发挥的作用较大,占到了60％以上;在对NH3-N,TN,TP的去除中,SSFW作用较大.     

SBR法间歇式活性污泥系统处理有机废水的实验研究

采用实验室规模的序批式活性污泥曝气反应器(SBR)工艺处理有机废水.通过实验分析了不同曝气量、曝气时间、进水浓度、沉淀时间、闲置时间与SBR法处理效果之间的关系,确定了SBR法处理中低浓度的有机废水的最佳运行参数.实验结果表明,在SBR的曝气时间为4h、沉淀时间为1h、闲置1h的条件下,该工艺对COD、NH3 -N等均有很好的去除效果,经处理的有机废水COD、氨氮最高去除率分为89.74％、82.13％.     

好氧颗粒污泥膜生物反应器处理畜禽废水

采用好氧颗粒污泥膜生物反应器处理畜禽废水，分别对COD、NH4^＋-N、NO2^--N、NO3^--N的去除效果和对膜通量的影响进行了研究。结果表明：在水力停留时间（HRT）为8h，进水COD浓度为600mg／L，NH4^＋-N浓度为40mg／L的条件下，出水COD、NH4^＋-N的浓度分别为46．6和4．8mg／L。NO2^--N和NO3^--N的去除率也可达90％以上。并且好氧颗粒污泥的加入减缓了膜的污染。     

DO与低温下MBSBBR与SBR处理生活污水的对比研究

在不同曝气强度下,对比分析了MBSBBR与SBR两系统对低浓度生活污水中COD、NH+4-N、TN和TP去除效率影响,并在冬季验证低温条件下两系统的稳定性。结果显示:曝气量变化对MBSBBR与SBR系统去除COD影响不大;曝气量由高到低整个过程中MBSBBR系统NH+4-N和TN去除效率优于SBR。其中TN去除率在较低(0.4 m3/h)的曝气量下高于高的曝气量(0.8 m3/h),但过低的曝气量(0.1 m3/h)影响系统NH+4-N去除;曝气量在0.4 m3/h时TP去除效率略高。冬季低温运行时MBSBBR在COD、NH+4-N和TN去除率相对于传统SBR具有优越性,去除率可稳定在90%、80%、60%左右,两系统的TP去除率无明显差别,MBSBBR系统低温运行时出水COD、NH+4-N、TN和TP满足《城镇污水处理厂污染物排放标准》(GB18918-2002)一级A标准。     

新型生物反应器对微污染水预处理的试验研究

综合当前生物技术优势，设计开发了一种新型旋转式生物填料反应器，对微污染原水进行了预处理的试验研究。结果表明，当原水D0为4．1—4．7mg／L，CODMn浓度为7—10mg／L，NH3-N浓度为1．2—3．5mg／L时，经过预处理，D0增加列6．20—6．89mg／L；复氧率平均为48．1％；CODMn，NH3-N的去除率分别为36．5％，53．1％,由此表明此种填料的生物反应器对微污染原水有良好的处理效果。     

不同时期垃圾渗滤液两级UASB-A/O-SBR工艺深度脱氮

应用两级上流式厌氧污泥床(UASB)-缺氧/好氧(A/O)-序批式反应器(SBR)深度处理早期和晚期垃圾渗滤液.首先在一级UASB(UASB1)中实现反硝化,在二级UASB(UASB2)中通过产甲烷降解有机物,在A/O反应器的好氧区进行NH4+-N的硝化,最后在SBR中去除残余NH4+-N及通过反硝化去除NO2--N和NO3--N深度脱氮.试验结果表明:早期渗滤液ρ(COD),ρ(TN)和ρ(NH4+-N)分别为14.8,1.8和1.3 mg/mL,最终出水ρ(TN),ρ(NH4+-N),ρ(NO2--N)和P(NO3--N)分别为28,4,3.4和1.9 mg/L,获得了大于98%的TN和NH4+-N去除率.晚期渗滤液ρ(COD)为2.5 mg/mL;ρ(TN),ρ(NH4+-N)分别为3.0和2.9 mg/mL时,获得99%以上的TN和NH4+-N去除率.最终出水ρ(NH4+-N),ρ(NO2--N)和P(NO3--N)都小于10 mg/L,最终出水ρ(TN)为26～32 mg/L.     

ABR反应器处理生活污水的研究

研究了ABR反应器对生活污水中COD的去除效果、影响因素及不同隔室的作用．实验表明，ABR可使生活污水COD出水指标达GB8978-1996二级水质标准，并达到或接近一级标准．除第一隔室外，第二隔室、第三隔室发挥了明显的关键作用．HRT为6～10h、反应温度18℃左右即可取得较好的处理效果，明显优于UASB反应器，体现了第三代厌氧反应器的优势．表明ABR具有去除有机污染物的巨大潜能和广阔的应用前景．     

水解酸化+两级SBR处理蛋白饲料生产废水

通过水解酸化和两级SBR工艺处理蛋白饲料生产废水的试验研究,确定了水解酸化反应器的最佳停留时间,探讨了两级SBR反应器中CODCr、NH3—N和DO的变化规律.实验结果表明,进水CODCr在1 654~213 2 mg/L、NH3—N在35~65 mg/L时,反应器处理效果稳定,出水CODCr在100mg/L以下,去除率在96%左右,NH3—N在5 mg/L以下,去除率在92%左右,出水水质达到了《淀粉工业水污染物排放标准》.     

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。