Weekly Fleet Assignment Model and Algorithm

A 0-1 integer programming model for weekly fleet assignment was put forward based on linear network and weekly flight scheduling in China. In this model, the objective function is to maximize the total profit of fleet assignment, subject to the constraints of coverage, aircraft flow balance, fleet size, aircraft availability, aircraft usage, flight restriction, aircraft seat capacity, and stopover. Then the branch-and-bound algorithm based on special ordered set was applied to solve the model. At last, a real-world case study on an airline with 5 fleets, 48 aircrafts and 1786 flight legs indicated that the profit increase was $1591276 one week and the running time was no more than 4 min, which shows that the model and algorithm are fairly good for domestic airline.     

CBTC系统中的联锁技术研究

随着CBTC（基于通信的列车控制）技术的完善,联锁在轨道交通控制系统中的作用也在逐渐发生变化,就CBTC系统中的联锁技术,从轨道区段状态、进路建立、信号开放、进路解锁、信号显示、保护进路、运行方向及其他辅助功能等几个方面进行了分析与研究。     

城市轨道交通跨站停车方案优化模型及算法

城市轨道交通快速发展,人均乘行距离不断增长,使得研究城市轨道交通合理的列车停车方案成为必要,以满足越来越多乘客出行的需要.介绍轨道交通列车不同的停车模式,分析轨道交通跨站停车模式下影响乘客出行时间的相关因素.建立基于乘客总体出行时间节省最多的轨道交通列车跨站停车0-1整数规划模型,利用禁忌搜索算法进行模型求解.通过算例验证了该模型的可行性和禁忌搜索算法用于该问题求解的优越性,得出最优轨道交通列车跨站停车方案.对与目标函数值相关的列车发车间隔、停站时间和最高运行速度等参数进行灵敏度分析,结果表明:调节跨站运营条件下的发车间隔和停站时间可使目标函数,即乘客总体出行时间发生显著变化.     

基于GSM-R无线网络实现车-地通信的CTCS-3级列控系统分析

着重阐述基于GSM-R无线网络的车-地通信如何实现地面设备之无线闭塞中心子系统与车载设备连接,如何确保无线闭塞中心子系统发送行车许可和临时限速等控车指令实现高速列车的无线指挥,以及如何完成无线闭塞中心实时接收车载设备动态信息的无线反馈。     

既有线速度台阶升级为目标距离模式的安全策略

基于北京地铁13号线ATP系统由速度台阶模式升级为目标距离模式的设计开发和工程化应用,介绍了设计开发过程中所考虑的安全策略。     

瓷窑湾站64D半自动闭塞结合电路设计探讨

包神铁路瓷窑湾站64D半自动闭塞结合电路,提出了以压入接近区段YSG及完全出清接近区段并以压入站内区段SSLG作为二点检查,列车出发驶至车站的发车口时,直接使闭塞机转入闭塞状态的方案,既保证行车安全又节省工程投资。     

考虑K0固结或渗流与变形耦合的软土基坑工程二维数值模拟

在大型有限元通用软件ABAQUS的平台上进行了邓肯-张模型用户材料子程序的开发,首先采用平面应变单元、二维梁单元和二维桁架单元考虑接触相互作用的耦合有限元法,时福州市一典型软土基坑工程按实际分步开挖和支护过程进行了二维数值模拟"目标试验".模拟过程中土体分别采用了K<,0>固结和正常固结试样的邓肯-张模型及莫尔-库仑理...     

自动闭塞区段增设接近离去停电表示电路

用继电器的空闲接点组成停电表示电路。当车站设备停电时,在控制台上给出区间的占用表示,便于人员监督列车的运行。     

EQ6100汽油机发生缸体疲劳的根源

针对少数发动机缸休裂纹采取曲轴加平衡加降低了缸体应力水平，但掩盖了引起疲劳的原因，追溯其根源，是ＥＱ６１００汽油原始设计留下的隐患。     

The Gulf Stream, rings and North Atlantic eddy structures from remote sensing (Altimeter and SeaWiFS)

Seasonal SeaWiFS chlorophyll a concentrations cycles and annual changes of altimeter Sea Level Anomaly are derived for the subtropical North Atlantic near  35°N and along a Gulf Stream axis. Spatial structure of SeaWiFS, is defined in terms of deviations from a local seasonal cycle and examined in relation to altimeter eddy structure. In the subtropical region near 35°N, SeaWiFS structure is evident during the spring bloom period with a scale of  430 km, or about twice the eddy scale. A Gulf Stream axis has been selected as a region where the Sea Level Anomaly variance is a maximum. Eddy propagation speeds and scales are examined. Cold-core (cyclonic) rings correspond to areas of high SeaWiFS chlorophyll a. Warm-core (anticyclonic) rings relate to areas of low chlorophyll concentration. Both SeaWiFS structure and eddy structure have a spatial scale of  450 km or twice the ring scale along the Gulf Stream axis. SeaWiFS chlorophyll anomalies and Altimeter Sea Level Anomaly structure have an overall negative correlation coefficient of r = − 0.34. Swirl currents between eddies redistribute surface chlorophyll concentrations and can spatially bias maximum and minimum concentration levels off eddy centre.