二氧化氯消毒机理及其消毒副产物的控制

主要介绍了二氧化氯消毒的机理，阐述了消毒工程中消毒副产物产生的原因，提出了控制消毒副产物产生的方法。     

饮用水的消毒技术及消毒副产物的危害

介绍了我国饮用水消毒的主要方法——氯消毒法的技术特点，指出了该方法存在的问题，分析了各种副产物的危害性。最后对其他消毒方法，如紫外线消毒、二氧化氯消毒以及磁化消毒等方法进行了初步探讨。     

城市污水消毒技术的研究进展

城市污水消毒是保障水质安全必不可少的环节。目前,城市污水消毒方法主要为氯消毒、二氧化氯消毒、紫外消毒和臭氧消毒等,传统氯消毒由于产生有毒副产物而逐步为其他消毒方法所取代,阐述了各种消毒方式的消毒原理及应用,联合消毒技术将成为近几年发展较快的城市污水消毒技术。     

消毒技术在给水处理中的应用

阐述了氯、二氧化氯、臭氧、紫外线等几种消毒技术的原理及各自的优缺点，指出传统消毒工艺——氯消毒将被其他新兴消毒工艺逐步取代，并结合河南油田黄山水厂的实际情况，重点介绍了二氧化氯消毒工艺的应用。     

口腔印模材料消毒研究进展

口腔印模材料的污染是目前临床上普遍存在的问题。由于口腔印模表面可能携带大量致病菌,如不经过消毒处理,就可能成为乙肝、艾滋病等传染性疾病的感染源。因此,印模材料消毒问题日益受到了口腔医务工作者的高度重视。本文就目前印模材料消毒方法及其优缺点的研究进展做一综述。     

紫外线污水消毒技术在水处理行业的应用

本文结合城市污水消毒的必要性以及目前采用消毒方法的现状,介绍了紫外线污水消毒技术在城市污水处理厂的应用。     

浅析污水处理中的消毒工艺

随着人们对液氯消毒缺陷的认识, 以及液氯消毒副产物的潜在威胁, 寻找安全高效的污水尾水消毒技术成为目前污水消毒的必然趋势。紫外线消毒由于具有杀菌快速高效、安全、易操作及占地小等优点, 越来越受到研究人员的重视。本文针对污水处理中的消毒工艺进行了阐述。     

饮用水消毒技术

本文总结了目前存在的饮用水消毒技术 ,并对各种消毒方法的原理及优缺点进行了分析     

常规氯化消毒工艺中典型消毒副产物生成的数学模型

快速有效监控饮用水中消毒副产物的生成,是饮用水安全管理中的重要基础性工作.基于供水企业常规氯化消毒工艺过程,采用均匀试验设计,研究了水源地源水UV254值、氨氮含量、加氯量和pH值等关键因素对典型消毒副产物三卤甲烷(THMs)和卤乙酸(HAAs)生成的影响,并以SPSS统计软件对数据进行了线性和非线性拟合.结果表明:线性模型能较好地描述THMs和HAAs的生成(相关度均大于0.9),而非线性模型中二者的相关度分别为0.924和0.883;考虑各因素交互作用下,THMs和HAAs生成的线性模型的相关度均为1,进一步改善了拟合效果.建立的快速预测上述消毒副产物生成的新方法,可为完善检测条件制约下饮用水安全风险管理提供理论依据.     

高压消毒岗位与屏障内岗位的工作协作探讨

高压消毒锅是介于屏障系统内外之间的物理消毒器械,也是物品内流的重要关口,高压消毒锅消毒物品的效率高低将直接影响消毒与屏障内岗位的工作配合.制定消毒制度,协调消毒与屏障内岗位的配合,对提高屏障系统的工作效率十分重要.     

水消毒过程的自适应动态矩阵控制

本文提出自适应动态矩阵控制算法对水消毒过程进行控制。仿真结果表明，算法有较强的鲁棒性。     

连续消毒塔系统的自适应模糊PID控制

本文提出的自适应模糊ＰＩＤ控制器，是在传统的模糊ＰＩ控制器基础上增加了具有预测作用的模糊ＰＤ控制和性能指标监督的适应性控制，使系统的控制性能大大提高，且保持了控制器结构简单和易于实现的优点。仿真研究表明了该方法的有效性。     

纳米TiO_2光催化杀灭水产病原菌的研究

研究了纳米TiO2对大肠杆菌、嗜水气单胞菌和鳗弧菌的光催化抑杀性能.结果表明,纳米TiO2对3种细菌均具有较强的杀灭能力,纳米TiO2质量浓度为0.1 g/L时,在紫外灯下催化2 h杀菌率可达98%以上,在日光下催化2 h杀菌率仍可达96%以上.光催化杀菌效果与纳米TiO2的质量浓度和作用时间有关,质量浓度过低或作用时间过短时,杀菌效果均不理想;质量浓度过高时,催化剂未能得到充分利用,当纳米TiO2质量浓度达0.1 g/L、作用时间达2 h时即可取得良好的杀菌效果.     

饮用水卤代消毒副产物及其控制技术研究

论述了饮用水卤代消毒副产物(三卤甲烷和卤乙酸)的研究现状,分析了其对人类健康的危害,介绍了去除副产物的各种有效途径,并展望了今后的研究方向。     

二级净化水加氯灭菌技术研究

经夏、冬两季对不同水温、不同CODcr值的净化污水进行加氯灭菌试验,试验表明对于杨家堡污水净化厂的二级净化水,夏季加氯量在2．0mg/L-2.3mg/L,接触时间在30min以上;冬季加氯量在6．0mg/L-8.0mg/L,接触时间在1．5h以上则可达到消毒、灭菌目的。     

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.