Analysis of the Effectiveness of Thermosiphon, Awning and Insulations Board on Permafrost Roadbed

1Preface TheconstructionofQinghai TibetRailwayonceagaindirectedtheattentionofthescientificand researchpersonneltofocusonthestabilityof permafrostroadbed.Toensurethestabilityofpermafrostisvitaltothesolvetheproblemsof permafrostroadbed,whilekeepthepermafrost freezingisareliablewaytokeepthepermafroststable.Therearemorethanonewaystoprotectthe permafrost.Basedonthefundamentalmeansof heatexchangebetweenatmosphereandsoil,aswellastheheattransferinsidesoil,peoplehave comewithaseriesoftechniques,sucha…     

我院顺利通过学士学位授权单位及专业评审

我院于5月16日已顺利通过学士学位授权单位及专业评审。评审专家对我院办学成绩给予了充分肯定和高度评价，认为我院办学指导思想正确，定位准确，思路清晰，重视改革办学条件，重视师资队伍建设，重视科研工作，采取多种形式培养良好学风，较好地实现了由高职专科学校向本科院校的转变。     

A Roadbed Cooling Approach for the Construction of Qinghai-Tibet Railway

Over one half of the permafrost along the Qinghai-Tibet Railway is ＂warm＂ and approximately 40% ice-rich. Under global warming, the construction of the Qinghai-Tibet Railway needs to consider climate changes over the next 50 - 100 years. Recent estimates indicate that the air temperature on the plateau will increase by 2.2- 2.6℃ by 2050. Thus, the key to the success of the railway construction lies in preventing the permafrost underlying roadbeds from thawing. It has been more than 100 years since the first railway was build over permafrost. A frost damage ratio of greater than 30 % has been reported for all the railroads built in permafrost regions. Based upon the experience and lessons leamed from roadway constructions over permafrost, this paper proposes a more proactive design approach for the construction of the Qinghai-Tibet Railway. This approach focuses on cooling down the roadbed by lowering the ground temperature and is different from the passive method of preventing permafrost from thawing by simply increasing thermal resistance （e. g., increasing embankment height and using insulating materials）. This ＂roadbed cooling＂ design approach is especially relevant to ＂warm＂ and ice-rich permafrost areas. A number of measures can be taken to cool down the roadbed, including proper selection of roadbed material, and configurations to adjust solar radiation, heat convection, and heat conduction patterus in and/or around the roadbed.     

网吧认证计费管理系统的设计与实现

对宽带IP网建设与发展过程中产生的多种认证与计费的前沿技术进行分析、比较和研究,提出了基于PPPoE等协议对网吧授权、认证、计费、监控管理系统的开发方案。该系统在数据链路层采用PPPoE协议,通过PPPoE拨号对用户身份进行认证;在网络层使用路由器实时采集数据,对用户按规定进行计费;并与服务器上的AAA(Authorize-Authenticate-Account)软件技术相结合,解决了上网用户授权、身份认证、时长/内容计费、营业状态管理等宽带IP网络应用过程中面临的核心问题。本系统由四个子系统组成,分别是:管理端代理端子系统、认证计费子系统、网吧前台子系统、网吧客户端子系统。     

EJB组件安全性技术的研究

本文讨论Java EE平台下开发、部署企业级信息系统所涉及的EJB组件安全性技术,深入分析EJB组件安全性体系结构,着重研究EJB组件在构建企业级信息系统中所涉及的三个主要安全性技术问题验证机制、授权机制和安全性通信.     

水平移动荷载作用下沥青路面的永久变形

为分析长大纵坡路段、城市交叉口或公交站台处沥青路面永久变形严重的原因,借助于有限元软件ABAQUS并编写了UTRACLOAD及DSLOAD子程序,计算了水平移动荷载作用下的沥青路面响应.研究结果表明:由水平剪切力引起的竖向永久变形和由正压力引起的竖向永久变形相比同样严重,均需严格控制;相同水平荷载作用下,随着荷载移动速...     

推动宁波市专利质押贷款的对策研究

在国家知识产权示范城市创建工作的推动下,宁波市在知识产权创造的数量、质量方面有了明显提升。2009年,全市专利申请量达22686件,专利授权量达15824件。但专利拥有量的快速增长并没有给中小企业带来立竿见影的现实效益。由于缺乏资金,全市有一半以上的专利权目前只能停留在证书上,产业化的瓶颈就是融资难题。     

高新技术企业授权发明专利占比达75.0%———2010年度杭州市企业专利分析报告

根据浙江省知识产权局、国家知识产权局和江苏省知识产权局公布的专利统计数据,本文对2010年杭州市企业专利申请与授权量进行统计分析,研究杭州市高新技术企业专利授权情况,并对18个重点城市企业专利情况进行比较研究。杭州市企业专利申请与授权情况