城轨系统中几种常用测速方法的误差与应用分析

列车速度信息在城市轨道交通ATC系统中占有重要地位。速度测量是ATP系统的重要功能之一,速度信息的准确性直接影响着行车安全。为此,对城市轨道交通系统中几种常用测速方法的误差进行分析,明确各种测速方法的优劣,同时对它们的应用进行分析研究。     

某住宅楼现浇钢筋混凝土楼盖裂缝的防治

文章结合现浇钢筋混凝土楼盖建设和使用的全过程分析了其裂缝产生的原因,据此提出防治裂缝出现的具体措施,以及裂缝出现后的处理原则、方法,对工程实践具有一定的参考价值。     

论ISO9001质量体系与施工企业管理

ISO9001质量管理体系适用于任何组织,介绍了在公路施工企业内部建立并完善质量管理体系的要求与质量管理过程。     

论我国船舶油污损害赔偿基金制度的完善

文中结合中国国情及国际相关做法,提出了建立我国船舶油污损害赔偿基金制度的相关建议,以期对该制度进一步完善     

《船员培训管理规则》主要修改内容解析

为满足《STCW公约马尼拉修正案》的新要求,并与国内履约法规相协调,交通运输部于2013年对《船员培训管理规则》进行修改。文中介绍了《船员培训管理规则》修改的背景及必要性,说明修改的原则和思路,阐述修改的方法和主要内容,供相关人员更好地理解修改后的《船员培训管理规则》。     

单体双气垫登陆艇概念设计研究

针对一型登陆艇完成了单体双气垫船的概念设计,对单体双气垫船的设计方法进行了探讨,提出单体双气垫船的设计应分为船体主尺度要素设计以及气垫尺寸和布局设计,设计结果显示单体双气垫船型方案具有较好的军事价值,在快速性、登退滩性能和生存能力方面效果较好。     

Research on the management innovation and practice of construction for Beijing-Shanghai high speed railwayEI北大核心

Construction of Beijing-Shanghai high speed railway is unprecedented great feat. Around the construction goal of "world class", a series innovation and practice measures are taken in the construction ideas, organization and management, technology research, investment financing, quality, safety, investment, construction period, environmental protection, stability, and so on, to lay a solid foundation of completing Beijing-Shanghai high speed railway construction efficiently. In the current new situation of speeding up railway construction, systematically summarizing the results of management innovation and practice for Beijing-Shanghai high speed railway has very important practical significance to improve the level of railway construction project management in our country.     

Improved Speed Estimation From Single-Loop Detectors With High Truck Flow

Single-loop detectors are the most common sensors employed by freeway traffic management agencies. The data are used for traffic management and traveler information. Single-loop detectors can only measure flow and occupancy. Although speed is often the most useful metric, it can only be estimated at conventional single-loop detectors. Typically this estimate comes from the quotient of flow and occupancy multiplied by the fixed, assumed average effective vehicle length. This conventional approach is limited because the actual average effective vehicle length will vary from sample to sample. Many researchers have proposed alternatives to address this problem, and although many of the methods work well under normal conditions, there has been limited research into methods that yield reliable estimates under heavy truck traffic. Heavy truck flows may arise as a function of location or time of day, for example, with proximity to a trucking facility or in early mornings when the number of passenger vehicles drops, respectively. This article presents a new methodology to estimate speed from single-loop detectors in conditions where trucks comprise a large percentage of the fleet. While the focus is on single loop detectors, the work is equally applicable to side-fire microwave radar detectors that emulate single-loop detectors.     

浅谈国内船舶制造企业的效率管理

近年来,中国船舶工业飞速发展,取得了巨大的成就,然而国内船企在生产效率方面与日韩的差距还很明显,本文对当前的水平与差距进行了阐述,并着重就如何提高生产效率的措施与方法做了一些探讨与思考。     

基于舱室三维重建模型的舱容计量技术研究

快速高效的舱容计量技术对国内外液货公平贸易、舰船的续航力与自给力以及国防建设具有十分重要的意义。针对传统的舱容计量方法存在的效率低、精度差等缺点,提出了一种基于舱室三维重建模型来实现舱室容量计量的新方法。探讨分析了该方法中所存在的关键技术问题,通过对比试验验证了该方法的可行性与可靠性。