轻型货车转向架试验简介

介绍了为美国315K货车开发的轻型转向架在FAST试验线的试验结果.     

Plate scanning tools to obtain travel times in traffic networks

The management of vehicle travel times has been shown to be fundamental to traffic network analysis. To collect travel time measurement, some methods focus solely on isolated links or highway segments, and where two measurement points, at the beginning and at the end of a section, are deemed sufficient to evaluate users' travel time. However, in many cases, transport studies involve networks in which the problem is more complex. This article takes advantage of the plate scanning technique to propose an algorithm that minimizes the required number of registering devices and their location in order to identify vehicles candidates to compute the travel times of a given set of routes (or subroutes). The merits of the proposed method are explained using simple examples and are illustrated by its application to the real network of Ciudad Real.     

Correcting injection pressure maladjustments to reduce NOX emissions by marine diesel engines

Emissions from the exhausts of marine diesel engines comprises several different gases including NO_X. These are currently regulated at the international level under Regulation 13 of ANNEX VI of MARPOL 73/78, but this regulation only applies to new engines and is based on bench tests, for only a single engine designated the “parent engine”. Here, the need to take measurements from across their whole range and once in operation on board a vessel is examined. This would not only improve assessment of new equipment against the current regulation, but would also detect defects in the functioning of the engine.     

先进的铁道车辆检查系统

先进的铁道车辆检查系统能提高铁路的安全性、降低成本并改善客户服务.本文重点介绍了闸瓦和车轮轮廓检查系统的试验、现场考验和运用情况.     

胎儿中枢神经系统畸形的超声诊断及其形成机理

中枢神经系统畸形是胎儿畸形的重要部分 ,可导致胎儿死亡 ,给孕妇及家庭带来巨大的痛苦。及早准确地发现各种中枢神经系统畸形 ,对临床及时处理、治疗以及优生优育均有着极其重要的价值。1　资料与方法1.1　临床资料　 148例孕妇胎儿中枢神经系统畸形为1993～ 1998年美国加州奥克兰ＡｌｔａＢａｔｅｓ产前诊断中心的孕妇超声检查结果 ,所有病例均经引产后病理或生后证实为中枢神经系统畸形 ,年龄 2 0～ 41岁 ,孕龄 15～ 39周。1.2　主要仪器及方法　美国Ａｃｕｓｏｎ - 12 8、Ａｃｕｓｏｎ -12 8ＸＰ5以及Ｓｅｑｕｏｉａ彩色电脑声像仪。按…     

工程建设项目中的信息管理

从工程建设项目管理的角度阐述了项目中信息流的组成、项目信息的交换过程和项目信息管理的特征，并提出了项目信息管理的任务。     

汽车行业供应商新一轮的合并

"全球汽车行业供应商的整合"成为一门引起人们强烈兴趣的课题,至少已经有二十年的时间了.显而易见,合并本身并没有把我们引向一个最佳的市场结构.现在汽车行业正在经历的重组将会使得很多公司"瘦身",而在战略上更加专业化.     

Do maritime passengers’ subsidies in Europe affect prices?

Some European governments subsidize their residents when they travel at sea. This paper seeks to analyze the impact on prices of maritime passengers’ subsidies in Europe. Following a review of the scarce academic literature on this topic and the subsidy scheme in Europe, a sample of firms’ prices and other characteristics of 40 European routes for 2016 are analyzed. Both an estimation of a price equation and a matching approach are applied and reach the same conclusion: prices per kilometer are around 40 per cent higher on those subsidized routes due to subsidies. This outcome reduces the potential subsidy gain to consumers.