亚热带季风气候条件下高边坡稳定性远程实时监测系统

针对粤西亚热带季风气候区雨季长、日照辐射大的特点,设计开发了一套高边坡稳定性远程实时监测系统,包括:力学传感器、数据采集与处理器、无线传输装置、太阳能供电系统以及信息化管理平台等五部分。该系统应用于广东云罗高速某边坡工程稳定性远程实时监测中已一年有余,至今运营状况良好,充分说明所研发的太阳能供电系统能解决监测设备的长期稳定供电问题。结合当地降雨与边坡施工情况,对监测数据进行分析,结果显示该系统对降雨和工程扰动的敏感度较高,可有效监测边坡稳定性状态。该系统的成功应用表明其较好解决了亚热带季风气候区雨季长、日照辐射大所带来的边坡稳定性监测问题,具有广泛的推广应用前景。     

基于Visual Studio平台构建矿山边坡安全监测系统

为了加强对边坡安全监测和管理,文章依托Visual Studio.NET多功能集成开发环境,结合Arc Engine嵌入式组件,利用工程及安全监测信息,构建矿山边坡安全监测系统,实现边坡模型的可视化显示、信息查询、数据管理和监测数据分析处理等总体研发功能目标,实例证明矿山边坡安全监测系统具有较好的效果。     

基于无线传感器网络的滑坡地质灾害预警监测系统研究

自动实时的边坡危岩变形失稳监测是预测滑坡等地质灾害发生的有效手段,有助于掌握其规律,及时分析并作出安全量性评价,使边坡灾害的概率及损失减到最小,甚至避免发生.为此,采用ZigBee无线传感器网络技术对边坡危岩的倾角和水位信息变化进行实时采样监测,通过无线通信和网络传输进行远程信息交互,实现滑坡等地质灾害的监测和预警.对该监测系统结构体系、无线传感器网络拓扑结构、无线传感节点的结构和软硬件设计、系统的性能和应用情况等方面进行了设计与测试.相比传统的岩土工程灾害监测系统,优点有实时监测及维护简便、系统成本低、节点简单及易布设、监控区域展扩方便等.     

高速公路边坡监测方法探讨

本文分析了公路的实际情况,选取适合的方法、手段以实现对公路边坡科学、经济合理的监测,建立与之相适应的边坡监测系统的要求,提出了建立公路边坡监测系统的合理程序,为高速公路设计、施工和运营提供科学指导.     

基于PC-BASE PLC的油井远程数据采集系统的设计与实现

对系统的软硬件架构、数据采集通信过程等难点和关键技术进行讨论.以PC架构可编程控制器ADAM 5510M为核心处理器,设计了油井远程数据采集系统.系统采用成熟的GPRS网络,结合嵌入式系统的软硬件技术,完成了远程数据采集处理,以达到远程实时监测、控制的效果.     

边坡监测技术与数据处理方法的研究

边坡的稳定与否,对工程的安全运营至关重要.高边坡的监测和研究是预防滑坡地质灾害发生的重要手段和方法.对GPS多天线阵列技术在边坡监测中的系统构成、方案实施和数据处理方法进行探讨.GPS边坡监测系统不但与监测设备是否能灵敏可靠地取得变形监测数据有关,而且还与数据处理方法有关.     

基于北斗三号远程监测系统的公路岩质边坡开挖变形分析

为确保G336神木段匝道岩质边坡开挖安全,设计并采用了北斗三号（BeiDou-3 Navigation Satellite System,BDS-3）远程监测系统对边坡开挖进行实时监测。该监测系统由数据采集与传输子系统、BDS数据解算子系统及数据发布管理子系统构成,能实现实时远程自动化变形监测。边坡开挖模拟发现：边坡岩土体水平与竖向累计位移均小于5 mm,日位移均小于3 mm,为保证施工安全,于是将累计位移预警值和日位移预警值分别设为4 mm与2 mm。位移监测发现：开挖过程中,边坡岩土体的竖向位移大于水平位移,能够率先反映边坡位移状态和变化趋势,因此,开挖过程中应重点关注边坡竖向位移以保证施工安全。采用强度折减法进行边坡稳定性分析时,可利用边坡岩土体位移突变来判断边坡是否稳定,模拟发现坡脚处不存在位移突变特征,因此监测点应尽量选取边坡中上部或者塑性带附近。     

综合监测技术在高陡边坡中的应用

针对厂坝铅锌露天矿高陡边坡的特点,确定了以"GPS监测手段为主,以水准仪、裂缝仪等监测手段为辅"的监测方案,详细介绍了该方案的设计与布设.以北帮边坡1500 m台阶的监测数据为例进行了变形规律分析,并评价了北帮边坡的综合监测结果.结果表明:在监测点B03～B06的北帮边坡稳定性最差,近600 d的最大位移量为231.1 mm,存在着滑移岩体;1500 m边坡岩体的变形速率曲线显现出明显的S形,凸起段表现为由雨季降水引起的加速变形期;裂缝的累积变形阶段呈现出初期的相对稳定期、中期的变形触发期和第3阶段的稳定变形持续期;北帮中部台阶1500 m边坡的变形较其他台阶边坡显著,稳定性最差.因此,该监测系统的应用效果较好,是高陡边坡变形监测的重要方法之一.     

风电机组传动系统网络化状态监测与故障诊断系统设计

针对现有风电机组监测系统无法对其传动系统早期故障进行有效诊断的问题,研发了一套基于B/S和C/S混合架构的风电机组传动系统网络化状态监测与故障诊断系统。根据应用需求设计了风电机组传动系统状态监测和故障诊断系统、整体框架和功能模块;结合数据采集设备,基于.ENT和SQL Server平台研发了风电机组传动系统状态监测和故障诊断系统,包括网络化数据采集、远程状态监测、信号分析、故障诊断和数据库服务器等模块。该系统成功应用于某风场风电机组传动系统状态监测和故障诊断。     

单片机控制的数据采集系统

本文论述了由8031单片机实现远程数据采集和监测功能的系统.该系统采用双CPU控制,远端CPU提供8路数据采集,本地CPU控制远端CPU,并进行数据处理、数据显示、键盘输入和系统报警等工作.通过单片机通讯的方式实现数据与控制指令的远距离传输.     

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。