关于人防地下室通风设计的几点思考

对于在进行人防地下室的通风设计中遇到的一些问题,（如风机的选型设计、平战结合的处理连接等）及自己对工程的风机房布置的一些看法进行阐述。     

既有混凝土建筑与新建钢结构建筑连接设计分析

本文对改、扩建工程的基本思路进行了描述,然后结合实际,以某工程为例,对工程中既有混凝土建筑与新建钢结构建筑连接设计中的一些情况以及问题进行了分析,并在关键问题上,如对钢梁和原有钢筋混凝土柱的连接、钢梁与和原有的混凝土梁的连接、新老建筑地下室底板衔接处放水节点的处理等,本文的目的就是为了为以后在工程中遇到此类问题提供参考。     

某中学教学楼抗震加固设计研究

通过工程实例的介绍,强调在加固设计中充分注重改善结构体系,提高房屋的整体抗震性能,加强构件的连接构造等设计理念;文章从方案选择、计算分析、节点构造等几个方面总结了加固设计的方法,希望为工程建设者提供一些经验和参考。     

高速公路与城市关系的探讨

高速公路是连接城市、满足城市间快速交通需求的公路运输载体,是为城市而生、为城市而服务的.依据国家高速公路网规划目标,高速公路是连接目前(编制年)城镇人口超过20万的城市的高效运输网络.作为高速公路与城市结合最为紧密的环城高速公路,多年来在规划和设计上并未给予足够的重视,出现了一些不尽人意的现象.随着人们对高速公路愈来愈多地了解,过去一些观点也在发生着变化.     

关于钢结构连接中螺栓合理排列问题的探讨

钢结构螺栓连接中的螺栓排列问题除了需要考虑受力、构造和施工要求,还要特别考虑截面削弱和截面受力的问题。不同的螺栓排列方式,净截面强度是不同的。本文通过具体实例说明螺栓连接的合理排列问题,为土木工程专业钢结构课程的教学和钢结构设计提供一些参考。     

公路工程测量教学和实践探析

本文描述了工程测量中一些较敏感的问题，如怎样连接联测导线、测量和设计中人员的合理安排以及CAD软件比较规划的标识方法和导线布置图等在教学和实践工作中运用的知识，并对测量精度进行了分析，得出一些有益的结论供相关人员作为参考。     

健美操团体动作的编排与创新

从音乐选配、动作设计、队型变化、连接配合等方面对健美操六人操编排与创新提出了一些建议。     

取水头部设计与施工要求

本文主要介绍本人承担的广州市自来公司某水厂扩建工程取水泵站取水头部设计，重点对钢管混凝土桩、连系梁、承台连接的设计以及对施工要求的一些问题作介绍。     

基于实例的钣金工艺设计技术研究

钣金工艺对于板会的设计以及制造等起着重要的连接作用,钣金设计以及制造水平随实践和技术的发展不断的提高,但是我们看到钣金工艺的设计水平还是相对滞后的,在很大程度上制约了整体生产效率的提升。本文从基于实例的钣金工艺设计出发,分析当前存在的一些问题的基础上来讨论想过的技术措施。     

钢结构高强螺栓连接设计的探讨

通过在施工与设计上对高强螺栓摩擦型连接设计与承压型连接进行对比,提出了按照承压型连接在其应用范围内具有的明显的优势,建议在设计中予以积极推广。另外,对于我国规范未提及的镀锌高强螺栓、具有镀锌涂层摩擦面、栓焊混合连接、在非标准孔情况下高强螺栓摩擦型连接承载力设计等问题,提供了国外的相关规范作为参考。     

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。