非航海毕业生海员培训需注意的几个问题

文中通过对辽宁海事局辖区非航海毕业生海员培训情况统计,根据非航海毕业生海员培训适任评估和考试结果,系统分析了非航海毕业生培训中存在的问题,并有针对性地提出了相关建议。     

上海港外高桥挖入式港池进口航道航行条件研究

外高桥挖入式港池规划前期论证的关键内容之一是其进口航道航行条件的评估。交通部上海船舶运输科学研究所接受委托,对规划船型的操纵运动方程进行了仔细研究。对规划船型的典型——“冰河”轮作了水动力测定;利用实船试验资料对操纵运动的数学模型进行科学率定;使用本所研制的船舶操纵模拟器对规划拟定的两个港池——外高桥嘴挖入式港池和五号沟挖入式港池的进口航道航行条件进行了比较深入的试验研究。最后,给出了两个港池安全进口的必要条件,为规划部门选定提供了科学依据。     

FOS EXPRESSION IN LUMBARSACRAL SPINAL CORD AND MEDULLA OBLONGATA INDUCED BY CHRONIC COLONIC INFLAMMATION IN RATS

Irritablebowelsyndrome(IBS)isacommon functionalgastrointestinaldisorderinpopulations.RecentstudieshaveshownthatpersistentIBSsymp tomsdevelopedinbetween7%and31%ofsubjects afterinfectiousgastroenteritisandtransientinflam mationenteritis[1].Thisassociationis…     

轻轨高架站大跨度三柱刚架墩设计研究

横梁、立墩尺寸及钢束钢筋的配置成为大跨度刚架墩设计中的难点,而横梁与墩的相对抗弯刚度是设计优化的核心点。以该核心点为基础,对城市轻轨高架车站的刚架墩的控制设计因素进行优化设计,并总结设计中的规律。     

受干扰的Link-16链路层仿真分析

从Link-16信号的实际传输和处理过程的角度出发,介绍了该信号的特征、参数和处理模型,通过Simulink软件对受到干扰的Link-16链路层进行了仿真,该链路层的仿真模型包括信源模块、干扰模块、信道模块、信宿模块和质量评估模块.仿真结果表明,随着十扰功率和干扰距离的渐变,误码率会发生跃变,发生跃变时的干扰功率为最低有效干扰功率,也就是最佳有效干扰功率,功率过小不能形成有效干扰,而功率过大只会造成浪费.     

基于CAN总线电阻的最大长度和节点数求解方法

以82C250作为CAN控制器与物理层总线之间的接口,通过CAN控制器向总线差动发送与接收,建立CAN总线网络分布等效电路,推导出最大总线长度和节点数,从而为选择CAN总线来组建船舶监控系统提供理论依据,解决了限制CAN总线速度进一步提高的缺陷,并能迅速发现和排除运行中的故障,增加安全可靠性.     

吸引社会资金投资铁路有关问题分析

铁路投融资体制改革取得了突破性创新,社会资金正在以多种方式尝试进入铁路投资领域。在投资者的投资决策过程中,社会资金重点关注投资安全、投资收益和投资退出等三方面问题。铁路管理部门要有针对性地对这些决策变量实施改革,制定相应政策,建立信誉机制和激励机制,有效引导、鼓励和支持社会资金参与和谐铁路建设。     

Dynamics of a Wheelset on Roller Rig

The expressions for the longitudinal creepage, lateral creepage and spin quantities are derived for a railway wheelset on a roller rig. The analysis takes into account the initial canting and the yaw motion of the rollers. A reduced set of Equations of motion representing the four degrees of freedom is also derived.     

Characteristics of household activity and travel patterns in the Mumbai metropolitan region

Activity-based modelling approaches require a typical survey instrument which can collect the finer details of activities of each individual over both time and space. This paper focuses on the design of a new survey instrument called an activity-travel diary; examines its method of administration; and analyses activity-travel behaviour in the context of developing countries. The Mumbai Metropolitan Region in India is selected as the study area. With the aim of understanding the activities of each individual over a period of time, a pilot survey was conducted in a continuous time frame for a period of 15 days, followed by a main survey. The analysis of data collected by the instrument reveals some interesting facts regarding the relationships between socioeconomic attributes, activities and trip making behaviour. Identification of interactions among households and other members were also facilitated by the newly designed diary, which is not a well-versed topic for research in the context of a developing economy like Mumbai's.