面向南水北调中线水质监测的GPS移动数据采集终端及系统的设计与实现

针对南水北调中线调水工程水质监测及管理的要求,提出对GPS(Globle Position System,全球定位系统)移动数据采集终端及其数据处理系统的功能需求,采用RESTfull Web Service的思想设计了监测终端与数据处理系统之间的REST风格的通信协议,选择智能手机平台实现了GPS移动数据采集终端,结合地理信息系统采用RubyOn Rails框架实现了数据处理系统。     

对抗旱服务组织发展的思考

叙述江西省抗旱服务组织现状,分析了制约抗旱服务组织发展的问题,提出了抗旱服务组织发展对策.     

TCP／IP协议的漏洞分析及防范

本文针对TCP／IP在安全领域的应用展开论述,详细分析了TCP／IP在几个关键地方存在的问题．对其安全漏洞进行了研究,给出了一些建设性的解决办法,为今后的进一步研究奠定了基础。     

Fragility curve probabilistic model applied to durability and long term mechanical damage of masonry

In view of preserving the historical heritage, the deterioration processes of masonry materials and the long term damage of multiple leaf historic buildingsisstudiedfroman experimental and a numerical point of view. Durability tests and pseudo-creep tests have been carried out and interpretedthroughprobabilistic models for the service life prediction. Theprecocious recognition of structural critical states will allow to designrepairandstrengthening interventions and to prevent total or partial failure of the constructions.     

Depletion of Antioxidants from a HDPE Geomembrane in a Composite Liner

The results of two series of accelerated aging tests are reported. Both series of tests were conducted at temperatures of 85, 70, 55, and 26°C over a period of about 3?years. In the simulated liner series, the top of the geomembrane was covered with a geotextile (protection) layer that was exposed to simulated municipal solid waste (MSW) landfill leachate while the bottom of the geomembrane was in contact with a hydrated geosynthetic clay liner. In the immersion series, the geomembrane was immersed in the simulated MSW leachate, and hence, both sides were exposed to leachate. The results from oxidative induction time tests indicate that the antioxidant depletion is about 2.2–4.8 times faster for the leachate immersed geomembrane than for geomembrane in a composite liner. The higher rates are attributed to the higher extraction of antioxidants from two sides of the geomembrane immersed in leachate. The measured antioxidant depletion rates are extrapolated to a range of temperatures (0–60°C) using Arrhenius modeling. At a liner temperature of 35°C, the calculated time for the depletion of antioxidants is about 40?years for a geomembrane in a composite liner compared to 10?years if it is simply immersed in leachate. These tests suggest that to obtain realistic estimates of geomembrane service life one needs data from tests that simulate the expected field conditions and that prediction based on immersion tests may underestimate the service life.     

Aging of HDPE Geomembrane in Three Composite Landfill Liner Configurations

Laboratory-accelerated aging experiments conducted to examine the depletion of antioxidant from a geomembrane (GM) underlain by a geosynthetic clay liner (GCL) are described. Three different “protection” layers between the GM and overlying gravel and leachate are examined: (1) A traditional nonwoven geotextile (GT); (2) a GT-GCL; and (3) a GT-sand-GT layer. The GT-GCL protection layer gives an antioxidant depletion rate 0.59 to 0.66 times slower than the GT layer alone. The GT-sand-GT layer gives depletion rates 0.72–0.75 times that of the conventional GT alone. Based on Arrhenius modeling, the time required for depletion of antioxidants at 35°C is estimated to be 65 years for a GM with a GT-GCL protection layer, 50 years for a GT-sand-GT layer, and 40 years for a conventional GT protection layer. These times are all significantly greater than the depletion time for GM immersed in leachate (10 years) for the geomembrane tested.     

National Standards for Urban Rail Transit

In this paper,we suggest the creation of passenger service standards for urban rail transit.We put forward standards suited for China's actual conditions,aimed at meeting an international level of service based on customer-oriented principles.     

基于Web Service的在线水文模型服务研究

通过分析目前水文模型本地服务模式的不足,针对当前国内外Web Service技术在水文信息系统中的应用现状,设计并实现了一个基于Web Service技术的在线水文模型服务系统,示范了基于Web Service技术的网络数据获取、水文模型运行模拟等过程,说明基于Web Service技术的在线水文模型服务较好地实现了水文模型网络共享,支持异地模型访问。建议在线水文模型服务结构从网络数据库/数据中心获取数据,一定程度上解决了传统模式从本机上传海量数据等问题。这种在线水文模型服务模式节约了模型运行成本、降低了用户要求,在具体水文水资源管理事务中具有较好的应用和拓展前景。     

一个基于Web Service的数据交换平台

简要介绍了Web Service的相关内容,阐述了Wse Xchanger平台的具体结构以及关键实现,并以该平台的一个实际应用——广东省港航行政管理综合业务系统为例说明了其具体应用。