法国国营铁路调动企业的综合能力开展研究工作

法国国营铁路建有遍及全企业的研究网.法铁希望在目前和将来都能通过这种横向运作方式发挥有益于企业自身及用户的全部技能和智慧.法国国营铁路的研究工作采取极分散式的方法.法铁的技术与研究局(简称DRT)集中了约一半的研究人员.而其它研究人员则在企业的各个局(基础设施、工程、机车车辆、车站等)和铁路试验处工作.     

KG<Subscript>max</Subscript> curves associated with second generation intact stability criteria for different types of ships

Currently, second generation intact stability criteria are being developed and evaluated by the International Maritime Organization (IMO). In this paper, we briefly present levels 1 and 2 assessment methods for the criteria of pure loss of stability and parametric roll failure modes. Subsequently, we show the KG_max curves associated with these criteria. We compute these curves for five different types of ships and compare them with the curves embodied in the current regulations. The results show that the safety margin ensured by the first level-1 method of calculation for both pure loss of stability and parametric roll seems to be excessive in many cases. They also show that the KG_max given by the second level-1 method and by the level-2 method may be very similar. In some cases, the level-2 method can be more conservative than the second level-1 method, which is unanticipated by the future regulation. The KG_max curves associated with parametric roll confirm that the C11 container ship is vulnerable to this failure mode. The computation of the second check coefficient of parametric roll level 2 (C2) for all possible values of KG reveals the existence of both authorized and restricted areas on the surface formed by both the draft and KG, which may replace the classical KG_max curves. In consequence, it is not sufficient to check that C2 is lower than the maximum authorized value (R _PR0) for a fixed ship’s loading condition.     

国外利用铁路发展轻轨交通

介绍了日本、美国、法国等国家利用铁路来发展城市轨道交通的情况     

看好不锈钢材

不锈钢材应用在上部结构、油气管道和储罐的好处在于包括高度抗腐蚀性在内的优秀的机械性能和良好的经济效益     

Genetic algorithms approach to the problem of the automated vehicle identification equipment locations

The automated vehicle identification (AVI) equipment location problem entails determination of the best locations for the automated vehicle identification equipment. The paper attempts to solve the AVI equipment location problem as a multi‐objective optimization problem, thus determining the best locations on the basis of several criteria. The developed model is based on genetic algorithms. Testing of the model developed on the greater transportation networks is certainly one of the most important directions for the future research, as much as the development of models based on other metaheuristic approaches (Simulated Annealing, Taboo Search). The results obtained in this stage of the research are promising.     

加速电气化:实现电动汽车大规模推广的关键步骤

正鼓励电动汽车的大规模推广需要哪些条件?L.E.K(.艾意凯)咨询最新研究显示,要改变消费者的购买行为,不仅需要在公共充电基础设施上进行大量投资,还需要从根本上增强电动汽车相比于内燃发动机汽车在总体拥有成本方面的竞争力。近几年,针对电动汽车的投资日益增加。如表1所示,越来越多的政府正积极鼓励大众使用电动汽车。同时,越来越多的汽车制造商也正在计划生产开发更多不同型号的电动汽车。据分析人士估计,     

铁道车辆车轮和制动技术的发展趋势

介绍了欧洲对铁道车辆车轮和制动性能所进行的改进,探讨了美国货车ECP制动技术在欧洲运用的可能性。