综合评价船舶安全状况方法的分析与比较

文章通过对目前船舶安全评价几种方法优缺点的分析、比较,重点论述模糊综合评价方法的特色及在船舶安全评价中的应用,提出做好船舶安全评价工作的建议和措施。     

Assessing the Potential Impacts of Connected Vehicles: Mobility,Environmental, and Safety Perspectives

The connected vehicle is a rapidly emerging paradigm aimed at deploying and developing a fully connected transportation system that enables data exchange among vehicles, infrastructure, and mobile devices to improve mobility, enhance safety, and reduce the adverse environmental impacts of the transportation systems. This study focuses on micromodeling and quantitatively assessing the potential impacts of the connected vehicle (CV) on mobility, safety, and the environment. To assess the benefits of CVs, a modeling framework is developed based on traffic microsimulation for a real network located in the city of Toronto, Canada, to mimic communication between enabled vehicles. In this study, we examine the effects of providing real-time routing guidance and advisory warning messages to CVs. In addition, to take into account the rerouting in nonconnected vehicles (non-CVs) in response to varying sources of information such as apps, global positioning systems (GPS), variable message signs (VMS), or simply seeing the traffic back up, the impact of fraction of non-CV vehicles was also considered and evaluated. Therefore, vehicles in this model are divided into; uninformed/unfamiliar not connected (non-CV), informed/familiar but not connected (non-CV) that get updates infrequently every 5 minutes or so (non-CV), and connected vehicles that receive information more frequently (CV). The results demonstrate the potential of connected vehicles to improve mobility, enhance safety, and reduce greenhouse gas emissions (GHGs) at the network-wide level. The results also show quantitatively how the market penetration of connected vehicles proportionally affects the performance of the traffic network. While the presented results are pertinent to the specifics of the road network modeled and cannot be generalized, the quantitative figures provide researchers and practitioners with ideas of what to expect from vehicle connectivity concerning mobility, safety, and environmental improvements.     

内贸集装箱运输危险货物安全管理探析

通过分析内贸集装箱在运输危险货物中存在的安拿管理隐患和管理制度中存在的问题厦其产生原因,有针对性地提出加强海上集装箱运输危险品安全管理的一些建议与措施。     

基于PHA-LEC-SCL法公路隧道施工安全评价研究

为了制定科学的公路隧道施工安全评价的基本模式,针对公路隧道施工的危险、有害因素的危害程度及特殊工艺,将公路隧道施工系统分为隧道开挖、爆破、施工用电、施工通风、出碴与洞内运输、支护衬砌等6个主要子系统.运用预先危险性分析法(PHA)对公路隧道施工的危险、危害因素进行辨识和定性分析,结合作业条件危险性评价法(LEC)对公路隧道施工系统中各子系统进行危险性评价,定量分析计算PHA中的子系统各个危险因素的危险等级,并采用安全检查表(SCL)对公路隧道施工现场进行安全综合评价,建立了安全评价方法之间的内在联系.PHA-LEC-SCL法确立了公路隧道施工安全评价的基本模式.     

高边坡建筑对坡体稳定性的影响分析

文章借助有限元极限分析法,对西南地区常见的修建建筑物的岩质坡体进行稳定性分析,揭示了不同的建筑自重和基础埋深对坡体安全系数的影响程度。     

汽车发动机排气门辅助制动系统试验分析

文章介绍了排气门辅助制动系统的构造及其工作原理,通过平板式制动试验台试验与整车道路试验,验证了排气门辅助制动系统对汽车运行的安全性、经济性和驾乘舒适性都有着显著的提高。     

城乡客运安全保障对策研究

文章针对广西城乡客运的实际状况,分析了城乡客运存在的安全隐患,提出了保障城乡客运运输安全的对策,为促进广西城乡客运的健康、稳定发展提供借鉴。     

构建铁路数据通信网骨干网的网络安全管理中心

针对当前铁路通信网络面临的安全问题,提出铁路数据通信网骨干网的网络安全管理中心的构建方案,通过被动、主动的防御手段,力争构建一个完整的、动态的网络安全管理中心,将铁路通信网络调整到最安全和风险最低的状态,持续地保证铁路通信各系统的网络安全。     

大型水幕防火分隔效果的试验研究

本文对大型水幕进行了足尺防火分隔效果的试验研究.试验结果验证了水幕防火分隔的可行性和有效性,提出了水幕系统在舰船消防设计时的设计方法和水量选择,可供建筑和舰船消防设计参考.     

弹簧安全阀的常见故障及其处理

分析了中、低压锅炉及压力容器上弹簧安全阀的常见故障及产生原因 ,提出了相应的解决措施。实践证明这些措施是有效的