排队论在航运业订舱储运系统中的应用

将排队论的方法应用到航运业订舱储运服务系统,建立多服务窗口等待制M/M/c/∞模型,用数学建模的方式把提高服务质量的两种最常用手段结合在一起进行量化分析,讨论在满足顾客需求的基础上保证系统的综合成本最低的最优化方法.     

武钢港口战略发展展望

<正>做强做大相关产业,实现多元化经营,是武钢"十二五"期间重点推进工作之一,也是武钢"三个转变"的重要措施之一。武钢港务公司肩负着武钢港口管理职责及承担着武钢原燃料的接收、贮存、加工、混匀、输送、钢材水运外发等任务,如何充分     

智能货车

本文论述当今新技术在智能货车上的应用情况，即车钩的冲击力测量车辆识别和车辆的自动摘钩，同时对其智能装置前景进行了展望，这些技术已经成熟，其具有技术实用性和经济意义，可将这些技术从仅用于运输作业局部监视功能扩充发展成整个运输作业管理系统。     

虹桥综合交通枢纽应急交通疏散预案仿真研究

从分析虹桥综合交通枢纽的路网结构及交通流特性出发,系统探讨突发事件下应急疏散过程中的交通组织策略,并对其进行微观仿真评价,结果可为应急疏散管理提供决策参考.     

Combustion Characteristics and Emission of a Two-Stroke Compression Ignition Engine with Two-Stage Injection

In order to study the effect of two-stage injection on two-stroke diesel engines, a well characterized research engine equipped with electronically controlled common rail system and scavenging system was constructed. Through analysis of combustion and emissions, two-stage injection shows its advantages. Compared with the standard injection, it produces less emissions, while compared with single early injection, it expands engine operation range. Further experiments were carried out to study the influence of several injection control parameters on two-stage injection. The fuel in the first injection is used for forming homogeneous mixture. The fuel in the second injection keeps combustion, and it is the main source of smoke emissions. NO_x is formed in both combustion process caused by these two injections, and there is an optimum fuel allocation ration to produce minimum NO_x. The cylinder pressure decreases, and the combustion is depressed with the increasing of scavenging pressure. By optimizing the injection control parameters of two-stage injection, NO_x and smoke can be reduced beyond 30% simultaneously.