错台处治技术在水泥混凝土路面的应用

针对水泥混凝土路面错台病害,系统介绍了环氧树脂砂浆薄层修补、增设传力杆预防性养护两种错台处治技术,以更好地指导高速公路路面养护工作。     

Solving resource-constrained multiple project scheduling problem using timed colored Petri nets

To solve the resource-constrained multiple project scheduling problem (RCMPSP) more effectively, a method based on timed colored Petri net (TCPN) was proposed. In this methodology, firstly a novel mapping mechanism between traditional network diagram such as CPM (critical path method)/PERT (program evaluation and review technique) and TCPN was presented. Then a primary TCPN (PTCPN) for solving RCMPSP was modeled based on the proposed mapping mechanism. Meanwhile, the object PTCPN was used to simulate the multiple projects scheduling and to find the approximately optimal value of RCMPSP. Finally, the performance of the proposed approach for solving RCMPSP was validated by executing a mould manufacturing example.     

轻型车用柴油机达国Ⅲ排放试验研究

通过对玉柴2.5L4F国Ⅱ柴油机进行试验优化升级来匹配某轻型车国Ⅲ机的排放要求.试验主要针对电控燃油喷射系统中的喷油器锥角、突出高度、增压器、EGR进行优化升级,结果表明样机能够满足国Ⅲ排放要求.     

上海F1国际赛车场停车换乘枢纽交通组织研究

2010年上海世博会日趋临近,城市交通面临着巨大的压力.停车换乘是一种缓解道路拥挤、优化交通结构的有效途径,而上海F1国际赛车场停车换乘枢纽承担着截留江苏方向自驾车参观世博客流的任务.通过对停车换乘枢纽、园区周边路网和上海市快速路系统细致的调查和枢纽客流特性的分析,讨论停车换乘枢纽的交通组织原则,提出社会车辆进出组织、枢纽内部组织、公共交通组织在内的多套比选组织方案,并对组织方案进行定性的评价分析.     

Protective effect of glutamine pretreatment on ischemia-reperfusion injury of spinal cord in rabbits

Objective To investigate the effect of glutamine (Gln) on the content of reduced glutathione hormone (GSH) and aminoglutaminic acid (Glu) of spinal cord following ischemia-reperfusion injury. Methods Totally 40 healthy adult male rabbits were randomly divided into five groups: sham-operation group (S group), ischemia-reperfusion injury group (I/R group), low-dose glutamine group (L Gln group), median-dose glutamine group (M Gln group) and high-dose glutamine group (H Gln group). After glutamine preconditioning, the model of spinal cord ischemia-reporfasion injury was established according to Zivin's method. The general status of animals was observed and the changes of Jacobs scoring were recorded in each group. Malondialdehydes (MDA), GSH, Glu and superoxide dismutase (SOD) activity in lumbar spinal cord tissues were determined using chemical colorimetry. The neuron number and deviation rate in spinal cord anterior horn were observed histopathologically. Results There was no significant difference between L Gin group and I/R group in behavior scoring, SOD activity, content of MDA and Glu, neuron number and deviation rate of spinal cord (P>0.05); however, there was a significant difference in GSH content of spinal cord (P<0.05). M Gln group and I/R group differed significantly (P<0.05) in behavior scoring, SOD activity, content of MDA, Glu, GSH, neuron number and deviation rate of spinal cord. Between H Gln group and M Gln group, there was no significant difference in behavior scoring, content of MDA and Glu, SOD activity, neuron number and aberration rate in spinal cord (P>0.05), whereas there was a significant difference in SOD activity and Giu content (P<0.05). Conclusion Pretreatment with medium-dose glutamine has a protective effect on spinal cord ischemia-reporfasion injury in rabbits, which may be related to the maintenance of GSH content, increase of SOD activity and reduction of MDA.     

无砟-有砟轨道过渡段设计分析

采用Fortran语言编制无砟-有砟轨道过渡段的力学分析程序.对比分析无砟-有砟轨道过渡段刚度过渡设置方式,并提出几种过渡段的结构设计方案,对无砟-有砟轨道过渡段的设计施工有一定的指导意义.     

基于DirectShow的音/视频传输系统设计与实现

在基于卫星通信的IP网络上,采用DirectShow架构,设计音频与视频数据的采集、编码,网络传输、解码及回放的解决方案,并用Vc++编程实现.为远程故障诊断、远程技术支援及远程视频监控等系统,提供通过语音与视频进行实时交流的功能.     

斜拉索剪切分层滑移及其对弯曲应力的影响

弯曲应力是斜拉索疲劳应力的主要组成部分。为准确分析斜拉索的弯曲应力,提出分层滑移模型以及有限元实现的方法,模拟分层滑移过程,分析斜拉索弯曲应力的变化规律。     

我国水下公路隧道建设科技发展成果综述

在对近年来我国水下公路隧道重大工程建设历程总结的基础上,着重介绍依托相关工程,各种工法水下隧道建设技术的重大科技攻关课题的开展情况和取得的成果,以及这些成果在实际工程中的应用推广。     

波形钢腹板组合箱梁的剪力滞效应

该文论述了采用空间有限元法分析波形钢腹板组合箱梁的剪力滞效应。在分析中考虑了集中力和均布力两种最典型的荷载工况。分析得到的结果与等代腹板的混凝土箱梁剪力滞效应进行比较,比较结果表明两者剪力滞变化规律相同,只是波形钢腹板组合箱梁的剪力滞系数略大。最后,根据分析结果得出一些有参考价值的结论。