Estimation of Probability of Swarming Pedestrians Violation at Signalized Intersections in Developing Cities

We made an on-site investigation about pedestrian violation of traffic violation decision and the impact of the number of pedestrians in colony that the probability of pedestrian violation rose with the waiting time for simulating mixed vehicles and pedestrians and used the on-site investigation data to validate the model.When traffic volume is light,the error between the simulated values and the measured ones is 2.47%.When traffic volume is heavy,the error is 3.38%.     

水翼艇及其控制方法综述

作为高速船舶中的一种,水翼艇以其优异的快速性、耐波性、操纵性及经济性等特点得到广泛的发展和应用。本文首先概述了水翼艇的发展历程,对国内外水翼艇的发展及现状进行了分析研究。重点总结了水翼艇的特点,以不同的角度对水翼艇进行了分类,对水翼艇的纵向控制方法研究进行了简要总结。最后,阐述了目前水翼艇研究存在的问题,对未来水翼艇的发展趋势进行了展望。     

Micro-simulation modelling for traffic safety: A review and potential application to heterogeneous traffic environment

This paper critically reviews micro-simulation modelling applications for traffic safety evaluation with respect to the use of different simulation tools, the application of surrogate safety indicators under different aspects of road environments and crash considerations. General input variables used to develop the models; key parameters for crash prediction; and calibration and validation approaches are explored in the paper. The strengths and weaknesses of used simulation packages for traffic safety evaluation are also pointed out. Moreover, recent advancements in the development and application of traffic safety micro-simulation model for safety assessment are also discussed.Despite having a number of studies, there is still a significant void in the development and application of simulation model to evaluate traffic safety of non-lane based heterogeneous traffic environments that predominate in many developing countries. The paper assessed the potential application of traffic safety micro-simulation model in heterogeneous traffic environments. Finally, a number of potentially fruitful future research directions are highlighted.     

铁路隧道检测技术现状及发展趋势

传统隧道质量检测方法以人工检查为主,结果依赖于检测人员水平,效率极低,远不能满足现场需求。为了检测设备的研制和保障铁路隧道运营安全,通过调研国内外多种隧道检测新技术和不同类型的综合检测车,分析现有隧道检测技术的特点,结果表明:目前的检测技术存在病害检测指标相对单一、自动识别程度低、检测速度较慢等问题。提出铁路隧道检测环境与公路隧道及城市轨道交通相比存在的一些差别,得出铁路隧道检测技术有以下发展趋势:(1)隧道衬砌质量无接触式检测;(2)激光扫描将成为表面病害主要检测方式;(3)检测设备高度集成化;(4)检测数据采集和处理自动化;(5)铁路隧道检测车需采用专用轨道车辆。     

防城港市中越国际道路旅客运输发展探析

文章介绍了防城港市中越国际道路旅客运输的现状,分析了限制中越国际道路旅客运输发展的原因,阐述了防城港市发展国际道路旅客运输的重要性、有利条件和机遇,并提出了中越国际道路运输的发展思路。     

Lateral dynamics of motorcycles towing single-wheeled trailers

A motorcycle towing a single-wheel trailer may provide useful transport for light cargo on narrow tracks and off-road use, particularly in rural areas of developing countries. Four designs of such trailers are described. Linear models are derived for the lateral dynamics of an off-road motorcycle towing this type of trailer straight ahead at constant speed. The trailers were tested behind an instrumented motorcycle. Linear autoregressive models were fitted to the experimental data using system identification techniques. Analytical and experimentally derived models largely agreed on frequency, damping and shape of the weave, wobble and trailer sway normal modes. The trailers made the motorcycle's steering heavier but the analytical models did not predict this. The location of the articulation axes between the motorcycle and the trailer were found to be critical for stability. The best trailer design handled well with loads up to 200 kg and speeds up to 70 km/h.     

21世纪的汽车发动机

从降低排放，改善燃油经济性两个方面，论述了２１世纪车用汽油机和车用柴油的发展趋势，经分析指标出，两种发动机在改善性能，降低排谚方面可以取长补短，相互相借鉴其新技术。     

高校图书馆如何造就合格的学科馆员

根据高校图书馆现有人才状况和学科馆员的素质要求，提出了造就合格学科馆员的方法和机制。重点论述了学科馆员队伍的长效发展机制，包括培养机制、选拔机制、继续教育机制、考核机制、激励机制等。