基于3G终端机车状态信息传输系统的设计

将3G技术应用于铁路交通,改善了目前机车基于GSM/GPRS无线通信存在的传输速率低、抗干扰性差和网络延迟大等不足.设计出了基于ARM9微处理器和嵌入式Linux操作系统的机车状态信息传输系统,该系统主要对机车运行状态信息进行采集、存储、传输和分析,并通过3G无线网络实时地把数据信息传输至地面服务器.地面各功能终端通过...     

兰州市机动车尾气污染及对策研究

通过对兰州市机动车保有量、主要干线车流量、车型比例及固定源污染状况的详细调查，重点分析估算了兰州市机动车尾气排放分担率、不同车型污染排放状况及主要路段的排污状况，提出了兰州市机动车尾气污染控制的管理及技术对策，为有关部门的管理和决策提供了理论依据．     

Locomotory activity and orientation of Mesobuthus gibbosus (Scorpiones: Buthidae) in central Aegean Archipelago

This study explores the locomotory activity of Mesobuthus gibbosus on Koufonisi Island (central Aegean). We measured orientation of movement, shelter selection and abiotic factors that influence locomotive activity throughout the circadian and lunar cycles. Our results show M. gibbosus is a highly active and negatively phototactic species with sexually dimorphic patterns of movements that are related to maternal protective behaviour. Male scorpions disperse more widely, apparently as a function of mate search, and exhibit much more opportunistic locomotive behaviour. The locomotory activity of the population was influenced by moon phase (negative phototropic) and air temperature, did not differ intersexually, and was directed towards a dry stone-wall where shelter was readily available.     

图象处理检测列车轮对算法的研究

机车轮对的检修是十分重要的,轮缘磨耗、踏面磨耗等是重要的测量参数.文中介绍了图像增强,边缘检测,边界跟踪算法,利用这些算法检测轮对参数能够达到比较好的效果.     

异常工况下机车牵引电机的功率限制

在一定的约束范围和正常运行条件下，电力机车的牵引电机才能实现满功率发挥.分析了超出正常运行范围和故障条件下不限功运行对牵引变流器及牵引电机的影响，重点介绍了限制牵引功率发挥的原理，并给出了功率限制模式下牵引电机功率分配方案.电机功率分配测试结果表明，在异常情况和故障条件下，电力机车能按照设定的功率限制曲线运行.这验证了限功条件下机车牵引电机功率分配方案的正确性.