任务驱动法在高职AutoCAD教学中的探索

本文阐述了任务驱动法在高职AutoCAD教学过程中的所具有的基本特点,从任务设计和教学组织等方面分析了任务驱动法在《AutoCAD应用》教学中存在的问题和对策。     

推行工程量清单计价对工程投标的影响

从工程量清单计价的特点、工程量清单计价对投标报价的影响进行了分析,提出了对投标报价具有指导意义的意见。     

基于扭矩的汽油机控制模型优化匹配研究

完成了基于扭矩的控制模型匹配标定,包括驾驶员需求扭矩模型匹配标定,摩擦扭矩和泵气损失扭矩匹配标定,每缸进气量与平均指示压力关系匹配标定,点火角效率损失和空燃比效率匹配标定,节气门模型匹配标定,空气系统模型匹配标定。标定结果表明,随着转速和平均指示压力升高,摩擦损失逐渐增加。随着冷却水温的降低,摩擦损失逐渐增加,随着进气量和转速的增加,泵气损失增加,平均指示压力和每缸进气量基本为线性关系。自主开发的控制系统经过匹配标定,能精确控制发动机稳定运转,表明开发的控制系统能达到预定的控制目标。     

基于风险导向的高速公路公司项目投资的内部控制研究

项目投资是高速公路公司的重心和核心,项目投资风险控制的效率直接决定着高速公路公司的生存发展。文章通过分析高速公路项目投资的项目决策、项目招标与合同签订、项目施工、项目结算四个环节的风险特点,以内部控制为突破口和支撑点,构建完备的风险导向型项目投资控制体系。     

铁路货运保价管理系统的规划研究

铁路货运保价管理系统是整个铁路保价生产和货运事故处理体系的技术支撑,建设好该系统对于提高铁路货运保价竞争力具有重要意义.本文从铁路保价模式改革方向设想出发提出了该系统建设的总体规划.     

军队支援地方抢险救灾行动车辆装备保障问题研究

随着我军职能任务的不断拓展,支援地方抢险救灾成为了我军除作战任务以外最为重要的军事任务之一。结合近年来我军参加的一系列重大的抢险救灾行动,分析了军队在执行抢险救灾任务时车辆装备保障的主要特点和存在的问题,提出了提升抢险救灾行动车辆装备保障能力的对策建议。     

基于项目化的“船体装配”课程改革探析

文章针对当前的职业岗位需求,以项目引领、任务驱动为导向,从改革思路、项目化设计、教学方法和手段等方面,开展了“船体装配”课程的改革探索,具有一定的实践指导意义。     

Operational performance comparison of four unconventional intersection designs using micro‐simulation

Several unconventional intersection designs have been proposed as an innovative approach to mitigate congestion at heavily congested at‐grade signalized intersections. Many of these unconventional designs were shown to outperform conventional intersections in terms of the average control delay and the overall intersection capacity. Little research has been conducted to compare the performance of these unconventional intersections to each other under different volume conditions. This study evaluated and compared the operational performance of four unconventional intersection schemes: the crossover displaced left‐turn (XDL), the upstream signalized crossover (USC), the double crossover intersection (DXI) (i.e., half USC), and the median U‐turn (MUT). The micro‐simulation software vissim (PTV Planung Transport Verkehr AG, Karlsruhe, Germany) was used to model and analyze the four unconventional intersections as well as a counterpart conventional one. The results showed that the XDL intersection constantly exhibited the lowest delays at nearly all tested balanced and unbalanced volume levels. The operational performance of both the USC and the DXI was similar in most volume conditions. The MUT design, on the other hand, was unable to accommodate high approach volumes and heavy left‐turn traffic. The capacity of the XDL intersection was found to be 99% higher than that of the conventional intersection, whereas the capacity of the USC and the DXI intersections was about 50% higher than that of the conventional intersection. The results of this study can provide guidance on choosing among alternative unconventional designs according to the prevailing traffic conditions at an intersection. Copyright © 2012 John Wiley & Sons, Ltd.     

基于特色化项目设计的“数控车削”课程改革探索与实践

文章在说明"数控车削"课程项目化教学改革目标思路的基础上,以具有行业特色的船舶配套零件加工项目为例,详细探讨其项目载体设计与基于工作过程的教学过程设计,并在课程项目化教学改革中予以实践。     

基于NSGA-Ⅱ的接运公交线路与时刻表协调优化方法

在公交规划研究中,常将公交网络规划问题分解为公交路线设计和行车时刻表设计,并尝试运用非传统优化方法解决,但对于多种公交模式换乘背景下的公交线路与时刻表协调优化问题的研究较为缺乏.文中以直接服务于轨道交通的接运公交为研究对象,在实现接运公交与轨道交通的有效衔接条件下,构建接运公交的路线选择与时刻表协调优化模型,并设计基于非支配排序遗传算法（NSGA-Ⅱ）的多目标优化算法对模型进行求解,实现接运公交路线与时刻表的协同编制,并通过实例分析检验模型.