中压共轨电液气门驱动系统的试验分析

以2135柴油机为样机,在自主研发的柴油机电子-液压控制系统试验台上进行试验,通过试验了解不同参数对电控可变气门系统的影响规律,说明在该气门驱动系统下实现气门参数控制的方式。     

南昌市大学生消费情况调查报告

进入大学的学子们每月都会拥有生活费,面对这些父母辛苦赚来的钱,我们的大学生们应该如何消费才合理？这是个不容忽视的问题,因为大学生个人理财问题,不仅关系到现在同学们的个人生活,更为今后步入社会打下一个良好的基础．因此,对于大学生,适当的节制自己的消费行为,养成不浪费、不铺张的习惯,是十分重要的．因此,大学生的日常消费情况应成为每一个人所关心的话题．     

水乡城镇常规公交运营现状调研方法及结果分析

为解析常规公交运营问题,奠定水乡城镇发展的公共交通基础,提出一套公交运营现状调查与分析方法。从供给角度设置站点配置、线路设计、线路客流量、满载率和运行车速等指标,通过随车调研采集数据;从需求角度设置居民出行特征、公交服务满意度和关注度等指标,通过问卷调查采集信息;基于技术角度,从公交网络、站点和线路构建评价指标,通过数据挖掘和分析获取评定结果。以东莞市道滘镇为例验证方法有效性,调查结果发现:道滘镇常规公交车运营现状存在客流量少、满载率低、运输服务通达性差等供需不平衡问题,需通过调整站点、拓展线路和优化衔接方案等改进公共交通运输系统。相较于传统调研模式,新调查方法更符合水乡城镇的路网结构和运输特征,能为常规公交运营现状提供多方位分析和评价。     

Organizational effects of experience from accidents. Learning in the aftermath of the Tretten and Åsta train accidents

This article explores possible signs on learning in organizations following two major railway accidents in Norway, the Tretten accident in 1975 and the Åsta accident in 2000. These are the most serious railway accidents to have occurred in the past decades and both involved collisions on a single track system. The two events have been analyzed and compared in order to investigate possible learning effects and possible differences in learning given the 25-year span between them. The study is based on the analysis of selected documents related to the accidents in general and the narrative components in the documentation related to learning in particular.Our findings indicate that learning from these events was not expressed as an explicit goal in the aftermath. Learning in these cases seems to be linked for a large part to a change in measures, technical, operational and organizational, but we have not observed any managed confirmation or comprehension processes. The Tretten accident report suggests that the possibility of human error should be mitigated through the implementation of technological barriers, while it omits all other elaborations and risk reducing measures. The Åsta accident report recommended that the work to introduce modern safety management principles that had already been initiated before the accident should be continued. Neither of the accidents yielded any new insights and the knowledge brought forward was merely perceived as confirmation of already-agreed changes.     

海洋工程辅助船横摇阻尼及舭部形状优化研究

阐述了横摇阻尼的各种构成成分及估算横摇阻尼的经验公式,分析了某海洋工程辅助船在两种舭部状态下的横摇阻尼,比较选取了横摇性能较好的方案,应用耐波性软件分析了两种舭部方案的横摇频率响应曲线,并试验验证横摇阻尼分析结果。研究表明：优选舭部方案的船舶横摇频率响应曲线同实验结果相当接近。     

中交四航院海岸工程勘察技术的回顾与展望

我国沿岸港口建设日趋饱和,需要在自然条件更加恶劣的沿岸建设大型港口物流枢纽、大型跨海桥梁、海底隧道及清洁能源风电机组等基础设施,海岸工程勘察常遇上浪高、流急、水深、风大等作业条件;另一方面,大型基础建设越来越需要高标准严要求的综合勘察技术以解决复杂多变的地质条件,采用传统单一的海上工程勘察技术越来越难满足大型工程建设的需要,寻求海岸工程勘察技术的革新是必然的要求。以四航院为例,回顾海岸工程勘察技术的发展过程,并展望勘察技术水平提高可增强国际竞争力,为推动我国水运行业的海岸工程勘察技术与国际接轨并参与国际竞争提供参考。     

Risk aversion,regret aversion and travel choice inertia: an experimental study

This paper presents the results of an experimental study into the role of risk aversion and regret aversion as codeterminants of travel choice inertia. Theoretical results published by Chorus and Dellaert are tested empirically. More specifically, the expectation is tested that when (1) travelers are risk averse, (2) the quality of travel choices is uncertain, and (3) the quality is partially revealed upon usage, travel choice inertia emerges as a learning-based lock-in effect. In addition, this paper studies the role of regret aversion as a possible trigger of travel choice inertia. Analyses are based on data collected in an experiment, where the reward that participants obtain is a function of the outcome of choices they make. Empirical results suggest that the learning-based lock-in effect indeed plays a role in the context of our data. The evidence for the hypothesis that regret aversion triggers inertia is mixed at best.     

发动机自动熄火故障的排除

轮胎式起重机"油改电"改造后,发动机经常自动熄火,必须予以解决。分析故障发生原因,阐述故障排除方法,效果较好。     

Detection Algorithms of Intentional Car Following on Smart Networks: A Primary Methodology

Abstract

This paper explores the possibility of detecting certain movements of vehicles that might provide useful information for crime investigations. It is known that existing car following models are interested in microscopic interactions between vehicles in randomly formed pairs. The present work, however, introduces the concept of macroscopic analysis of vehicle positions on a network and the idea of seeking if these movements exhibit any meaningful relationships. First of all detection algorithms are produced for two possible types of detection: (a) was a particular vehicle followed by any vehicle? and (b) did a particular vehicle follow any vehicle? These algorithms assume that every link in the network is equipped with some sort of vehicle identification or tracking device and the identities of all vehicles, such as their number plates, are fed into the program. Then a simulation program is developed to implement the first algorithm (Type (a)), as an example, to visualise the concept. Since the present paper is a preliminary and basic approach to the problem, a number of issues and details requiring further research, together with the directions which could be taken, are also identified and discussed.     

桥梁工程施工风险综合识别与评估方法

风险评估方法种类繁多,且各有优缺点,单一的方法无法满足实际的需求.根据桥梁工程施工的特点,提出了事故总结、结构分析、现场调研和专家调查四种方法相结合的桥梁施工风险综合识别方法,以及提出基于分级评判的桥梁施工风险综合评估方法.提出的桥梁施工风险综合识别与评估方法具有较强的实用性和有效性,可供桥梁工程施工风险评估参考.