基于Web的面向产品开发过程的客车PDM系统的研究

分析了现有PDM系统应用状况，针对客车产品的开发过程和技术管理的特点，构造了基于Web的面向产品开发过程的客车产品数据管理系统的总体结构，并研究了系统实现的关键技术与方法。     

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.     

LS6660客车的设计与开发

通过对我国目前公路运输状况的研究，分析了开发LS6660客车的市场和前景，并且在结合生产厂家的实际情况的前提下，在原有车型LS6600C2的基础之上，成功地开发了高性价比的、适合乡村公路中短途运输的LS6660客车，节约了开发和生产成本。     

论修船企业管理信息化

文章总结了我国修船企业管理信息化的经验,提出一套完整可行的适合我国国情的修船企业管理信息化技术和方法。     

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为了准确地反映城市交通网络布局、人口分布和职业分布等因素与交通行为之间的相互影响机制,同时考虑到发展中城市交通调查数据的完整性和准确性相对较差,首先建立了一种新的交通需求反馈模型,并对其进行改进,进而形成了一种新型集成模型。通过基于同一套发展中城市交通调查数据对不同模型进行参数标定以及对标定结果进行比较分析,本文得出结论：与被广泛应用的传统四阶段模型相比较,新的反馈和集成模型的标定结果的准确性有了明显提高。随后,根据新型集成模型的标定结果,本文又以富有代表性的发展中城市区域,即印度尼西亚的雅加达首都城市圈作为研究对象,对该区域将来的城市和交通可持续发展政策进行了探究。研究结果表明：随着对城市人口增长的控制、城市道路的建设、公共交通设施的不断完善,多副都心发展模式将成为该地区未来可持续发展的城市形态。     

新场镇农村生活污水处理现状及问题探讨

该文综述了目前新场镇农村生活污水处理的现状,对采取的3种不同类型的污水处理设施进行了介绍,并根据监测数据,对不同设施的处理效果和达标排放进行分析,最后提出新场镇农村生活污水处理工程在推进过程中必须解决的问题。     

船用中压电力系统的发展

主要介绍了船舶中压电力系统的相关内容,主要包括船舶中压电力系统的产生、发展及其供电网络结构、存在的技术问题以及未来的发展趋势等内容.     

大数据时代城市智能交通系统发展方向

伴随大数据时代的到来,新技术与新思维必将引发城市交通学科的重大变革,首先是城市智能交通领域。从交通系统的基本属性、交通大数据发展特征、城市交通发展的基本理念和战略出发,深入剖析中国智能交通系统研发与应用存在的隐忧和倾向:高端智能决策支持欠缺、车联网技术研发泛化、理论创新匮乏、系统建设依旧各自为政未形成合力等。强调城市智能交通系统的发展必须服从城市交通发展战略的需要,充分利用大数据技术。最后,提出未来智能交通系统的发展方向和系统建设任务。     

谈农村公路工程造价的控制

农村公路项目工程造价控制工作贯穿于项目建设的全过程,在这期间,着重立项、设计阶段,不忽视招投标与施工结算阶段,加强项目完结后的评价工作,这是行之有效的方法。     

Modelling with joint choice of ports and countries of origin and destination: application to Colombian ports

Literature has focused on studying port choice independently or as an element of a supply chain without considering the joint selection with the country of origin/destination of the imports/exports. However, the characteristics and location of a port may make it more attractive to mobilise more freight from/to some particular countries rather than others, making the port choice decision dependent on the country of origin/destination of the cargo. This article proposes advanced econometric models to evaluate simultaneously port choice and the country of origin/destination choice for Colombian imports and exports. Findings suggest that for imports and exports domestic freight rate is the most important variable for the joint choice process. Also, for exports, maritime transit time is more relevant than for imports, while for the frequency of shipping lines the opposite is true. The existence of a trade agreement and the gross domestic product per capita also have a significant influence on the election of a country for exports/imports.