甩挂运输半挂车电子标识技术研究

针对现阶段的道路运输远程监控体系中无法识别半挂车的身份与特征信息的问题,通过对甩挂运输企业、站(场)、整车生产企业进行广泛调研,文中提出了基于RFID无线射频技术的甩挂运输半挂车身份电子标识技术要求,分析了电子标识具体技术参数的限值范围,为规范甩挂运输半挂车身份电子标识的发展提供了技术支撑。     

强强联合 厚积薄发——交通运输部部长李盛霖访问中国工程院的讲话

<正>"通过物联网技术的应用,推动交通运输产业升级和提高现代化水平。一是加快研究完善基于射频识别技术的高速公路多路径识别和电子不停车收费技术,在示范工程基础上加快推广应用。二是推进物联网技术在城市交通运输中应用,加快智能城市交通运输系统建设。三是利用物联网改造现有基础设施,建设智能基础设施。四是加快基于射频识别技术的汽车电子牌照和全国性数字化交通运输管理体系研究,提高交通运输管理信息化和现代化水平,引领行业通过技术创新实现跨越式发展。"     

高速公路高清视频监控技术探讨

文章分析了高速公路视频监控技术的优势,探讨了该技术设计与应用方法,并结合实例阐述了该技术的具体应用情况,以期为加强我国高速公路视频监控管理提供参考。     

视频监控联网系统标准符合性检测平台研究

文章结合广西高速公路视频联网监控系统建设实际,阐述了视频监控联网系统标准符合性检测工作的任务及应用到的相关技术与工具软件,提出了开发一个实用性更强、更具推广性的标准符合性检测平台软件的新思路,并介绍了该平台的实现方法、应用技术及其推广效益。     

基于汽车故障诊断仪KT600的无线通讯系统研究

文章在不改变汽车故障诊断仪KT600的结构及使用方法的前提下,将射频技术引入到汽车故障诊断仪,开发了集CAN收发器、STM32单片机、nRF2401无线模块于一体的无线通信系统,实现了KT600由有线通信升级为无线通信,并结合该无线通信系统的工作原理进行试验对比研究,结果表明该无线通信系统解决了原汽车故障诊断仪因有线的限制而使用不方便的问题,使汽车故障的诊断更加灵活、方便,系统稳定、易于控制、通信可靠。     

BIM虚拟技术在异形建筑施工中的应用分析

文章将BIM虚拟技术应用于异形建筑施工中,通过BIM虚拟技术对施工进行碰撞检测、基坑支护施工模拟、管线综合分析及优化、施工进度模拟以及视频远程监控可视化管理进行分析,实现消除冲突、深化设计以及减少施工变更的目的。同时结合无人机、VR、三维激光扫描等新技术与BIM技术进行深度融合,不断完善BIM的应用,为今后同类工程在施工信息化的应用提供参考。     

梧州市桥梁网络视频监控系统设计特点

文章以梧州市桥梁网络视频监控系统设计为实例,介绍了网络视频监控系统总体设计思路,同时阐述了网络视频监控系统软件主要功能及特点,为网络视频监控技术在城市桥梁监控领域的发展提供了借鉴和参考。     

公路数字化档案唯一性标识编码研究

唯一性标识编码是公路数字化档案信息资源管理和应用的最基本单元。文章通过对公路工程档案资料的分析、整理、归类,借鉴国内外期刊文献数字对象唯一标识符方法,创立适用于公路数字化档案管理的"项目代号+属性+类别+流水号"四段位方式的编码规则,并将编码规则应用到计算机管理软件,实现了计算机对公路数字档案材料的自动编码,为计算机检索、管理提供了便捷途径。     

国外客运站信息化建设经验

汽车客运站信息化建设,不但对场站的管理和效益产生明显影响,对整个道路运输业的更高层次发展都至关重要,而我国汽车客运站建设并不令人满意,差距还很明显。据统计,我国运输枢纽和大型客运站,基本应用了计算机售票、视频监控和电子显示屏等;但低等级(四级以下)和小型场站,基本没有应用科技信息技术。因此无法形成有效的信息流,行业统计分     

论现代汽车电子信息技术及其发展趋势

电子信息技术在现代汽车上的应用越来越广泛,在提高汽车的操纵性能、燃油经济性、可靠性和自动化程度等方面发挥着越来越重要的作用。现代汽车采用先进的电子信息技术已经成为时代的发展趋势。     

Analysis of factors affecting the choice of route of pedestrians

Pedestrians as compared to vehicular traffic enjoy a high degree freedom of movement even in heavily congested areas. Consequently, there are more alternative links available to pedestrians between a given origin‐destination (O‐D) pair. This paper describes a study done by the University of Calgary to evaluate the factors affecting the choice of route on intra‐CBD trips or trips within the Central Business District (CBD).

An origin destination survey conducted in downtown Calgary, Alberta enabled the identification of the most significant factors influencing the choice. These factors were analyzed in relation to the physical characteristics of the location, personal characteristics of the trip maker and the type of the trip.

It appears that most people chose the shortest link and factors such as the level of congestion, safety or visual attractions were only secondary. This suggests that the length should be made a major consideration when planning and designing pedestrian links.     

实现多组态计量软件集中监控的可行性分析

天然气自动计量系统有多种组态软件,由于软件的不相通性,造成了计量系统数据采集的通用性差、数据传输与入库的时效性差、数据利用的可靠性低.结合各组态软件的实际情况,从设计上充分利用Oracle大数据处理能力以及Partition(分区表)的特性,实现历史数据的存储,应用WebService与COM+数据访问组件提供多层数据访问架构,采用OPC与DDE工业数据交换协议,实现了各站场计量数据的实时上传,为连续数据采集和实时监控提供了可能,节约了改造成本.     

注汽管道承压能力评估和实物试验验证

基于失效评估图技术对某注汽管道进行了承压能力评价,给出了管线在不同腐蚀壁厚情况下的极限承压能力和极限裂纹尺寸。并利用实物爆破试验验证了评价方法的安全性和有效性,通过对爆破断口进行宏观和微观分析,发现管段的开裂属于脆性开裂。     

波纹管应力分析研究进展

评述了波纹管应力理论研究方法的进展情况，围绕解析法、工程近似法和数值法，对波纹管理论研究中的一些主要成果作了较详细的回顾和总结，对各种研究方法作出了评价，展望了亟待解决的一些问题。     

Non-parametric analyses of efficiency of airports

This paper estimates the efficiencies and productivity changes of 12 international airports in the Asia-Pacific region based on data from 1998 to 2006. We apply stochastic frontier analysis (SFA) to compute efficiency estimates and use the Malmquist productivity index (MPI) to analyze productivity changes. We use the SFA model with a translog-type production function after testing the statistical hypotheses. According to the results of the SFA hypothesis tests, airports have experienced a technological regression; the deviations from the efficiency frontier are caused more by technical inefficiency than random noise. However, the inefficiency was found to decrease. The MPI reveals a declining trend resulting more from technological change than from efficiency change, with a decrease in inefficiency. Taken together, both the hypothesis tests and the MPI not only provide consistent conclusions, but also suggest that airports should concentrate on technological progress.     

Evaluation of pedestrian crosswalk level of service (LOS) in perspective of type of land-use

In India pedestrians usually cross the road at mid-block crosswalks due to ease of access to their destination or the development of adjacent land use types such as shopping, business areas, school and residential areas. The behaviour of pedestrian will change with respect to different land use type and this change in behaviour of pedestrian further reflects change in perceived level of service (LOS). So, it is important to evaluate the quality of service of such crossing facilities with respect to different land-use type under mixed traffic conditions. In this framework, pedestrian perceived LOS were collected with respect to different land-use type such as shopping, residential and business areas. The ordered probit (OP) model was developed by using NLOGIT software package, with number of vehicles encountered, road crossing difficulty as well as safety considered as primary factors along with pedestrian individual factors (gender and age), land-use type and roadway geometry. From the model results, it has been concluded that perceived safety, crossing difficulty, land-use condition, number of vehicles encountered, median width and number of lanes have significant effect on pedestrian perceived LOS at unprotected (un-signalized) mid-block crosswalks in mixed traffic scenario. The inferences of these results highlights the importance of land use planning in designing a new set of pedestrian access facilities for unprotected mid-block crosswalks under mixed traffic conditions. Also the study results would be useful for evaluating pedestrian accessibility taking into account different land-use type and planning required degree of segregation with vehicular movement at unprotected mid-block crosswalk locations.     

Direct analysis of the perceived importance of attributes of reliability of travel modes in urban travel

Reliability of travel modes was found to be the most important characteristic of transportation systems in several attitudinal investigations of individual travel behavior. This paper represents the first part of a research effort aimed at gaining a better understanding of the characteristics of reliability of transportation modes in urban travel. In this research, reliability characteristics are identified; their importance relative to each other is assessed, and an insight into possible structure of an objective reliability index is discussed. The research is based on perceived values of reliability, which were identified through a large attitudinal survey conducted in the Chicago metropolitan area.     

盾构隧道管片接头抗剪力学性能研究

通过对南京长江盾构隧道环向管片接头进行的三组原型抗剪(无螺栓剪切、有螺栓逆剪和有螺栓顺剪)加载试验,分析研究了管片接头在剪力作用下的受力、变形和破坏特征,给出了管片接头混凝土接触面的静摩擦系数,得到了接头剪力主要由混凝土接触面承担、破坏形式为连接斜螺栓剪切延性破坏的结论。通过对管片结构的有限元数值模拟计算得出:接头处的剪力与轴力比小于接缝面的摩擦系数,管片不会发生相互错动,结构是稳定的。     

埋地管道防腐保温层失效评价

明确埋地管道防腐保温层的技术评价标准,对埋地钢质管道的安全运行,延长管道使用寿命具有重要意义。为了对埋地管道防腐保温层做出有效评价,从间接检测与开挖检测2个方面,结合现场检测数据,提出了基于防腐保温层的电流衰减率、绝缘电阻率、质量状况与厚度的分级评价标准及基于4种评价指标的综合评判方法。工程实践表明,该评价标准对防腐保温层是否存在失效能做出有效判断。     

输油管道中原油乳状液的流变性研究

原油乳状液的流变性是原油开采后在管道中输送的重要研究方面,为了更好地研究这一性质,采用电动搅拌机、偏光显微镜以及流变仪等仪器来测定不同含水率的原油乳状液在不同条件下的黏度,观测不同含水率的原油乳状液在偏光显微镜下的形态。并且分别对原油乳状液的黏度与含水率之间的关系以及与剪切速率之间的关系进行研究,初步确定了所测区块原油乳状液的转相点以及该区块原油乳状液的流变特性,为生产中的油气集输提供了理论依据。