阳江港丰头作业区多用途码头验潮站布设方案研究

针对阳江港丰头作业区拟建多用途码头附近水域潮位控制的问题,论证出一套切实可行的验潮站布设方案,对以后的水深测量工作具有指导意义.文中实验结果验证此区域范围内潮汐性质一致,潮位基本相同,后续测量只需布设一个临时验潮站即可满足此区域内水深测量精度要求.     

Stochastic dynamic itinerary interception refueling location problem with queue delay for electric taxi charging stations

A new facility location model and a solution algorithm are proposed that feature (1) itinerary-interception instead of flow-interception; (2) stochastic demand as dynamic service requests; and (3) queueing delay. These features are essential to analyze battery-powered electric shared-ride taxis operating in a connected, centralized dispatch manner. The model and solution method are based on a bi-level, simulation–optimization framework that combines an upper level multiple-server allocation model with queueing delay and a lower level dispatch simulation based on earlier work by Jung and Jayakrishnan. The solution algorithm is tested on a fleet of 600 shared-taxis in Seoul, Korea, spanning 603 km², a budget of 100 charging stations, and up to 22 candidate charging locations, against a benchmark “naïve” genetic algorithm that does not consider cyclic interactions between the taxi charging demand and the charger allocations with queue delay. Results show not only that the proposed model is capable of locating charging stations with stochastic dynamic itinerary-interception and queue delay, but that the bi-level solution method improves upon the benchmark algorithm in terms of realized queue delay, total time of operation of taxi service, and service request rejections. Furthermore, we show how much additional benefit in level of service is possible in the upper-bound scenario when the number of charging stations is unbounded.     

谈城市交通与铁路车站站区的综合规划

随着经济建设的腾飞,我国城市交通建设和铁路建设的步伐也在加快,随之,城市综合交通规划设计也就成为摆在我们面前的一个新课题。     

大型地下车站洞室结构设计施工技术

红旗河沟车站是重庆轻轨3号线与地铁6号线的地下换乘车站,也是当前全亚洲建设规模最大的地下暗挖车站.依托该工程,介绍了大型浅埋暗挖洞室主体结构设计方法、支护衬砌设计与施工技术,包括洞群组成、主洞与附属洞的衔接方式、埋置深度确定、主洞断面设计、高边墙式大断面主洞开挖工法、支护类型等;着重研究了十字交叉节点的结构设计方法,并采用有限元方法进行了结构受力特征分析与开挖过程施工力学计算.通过施工过程的力学分析与精细化设计,红旗河沟车站成功建成,相关设计施工方法对今后类似超大型地下洞室工程具有一定参考价值.     

Passenger travel characteristics and bus operational states: a study based on IC card and GPS data in Yinchuan,China

ABSTRACT

In recent years, public transport has been developing rapidly and producing large amounts of traffic data. Emerging big data-mining techniques enable the application of these data in a variety of ways. This study uses bus intelligent card (IC card) data and global positioning system (GPS) data to estimate passenger boarding and alighting stations. First, an estimation model for boarding stations is introduced to determine passenger boarding stations. Then, the authors propose an innovative uplink and downlink information identification model (UDI) to generate information for estimating alighting stations. Subsequently, the estimation model for the alighting stations is introduced. In addition, a transfer station identification model is also developed to determine transfer stations. These models are applied to Yinchuan, China to analyze passenger flow characteristics and bus operations. The authors obtain passenger flows based on stations (stops), bus lines, and traffic analysis zones (TAZ) during weekdays and weekends. Moreover, average bus operational speeds are obtained. These findings can be used in bus network planning and optimization as well as bus operation scheduling.     

格拉管线泵站油罐第二次防腐涂漆实践

在格拉管线维持性技术改造中,对全线12座泵站的71座油罐进行了第二次防腐层除锈涂漆施工,积累了一些实践经验.对其施工要点进行了总结:查清旧油罐涂层的破损实情;落实除锈标准;彻底消除油罐渗漏隐患;选择适宜的施工条件;选择适合高原油罐防腐的涂料和适宜的涂刷方法;采取得力有效的安全措施.这些做法确保了高质量按期竣工,实现了安全无事故.这些实践经验,对类似工程有借鉴价值.     

乌江银盘水电站通航建筑物建设规模优化研究

根据银盘水电站工程河段航运条件和近几年乌江实际发生的货运量,采用灰色系统模型,对船闸设计水平年内的客货运量增长情况进行了预测,并结合该河段代表船型和合理的运输组织,对银盘水电站通航船闸建设规模进行了优化研究,提出了既满足设计水平年内运量增长需要、又节省工程投资的船闸建设方案,研究成果已为工程建设采用。     

自航绞吸式挖泥船“天鲸号”电力系统设计

＂天鲸号＂是目前亚洲最大、中国第一艘大型自航绞吸式挖泥船,不仅挖掘能力强、疏浚产量高,而且电站和驱动方式的设计达到国际先进水平。通过＂天鲸号＂在不同工况下供电情况的分析,具体阐述了功率的分配和电站的管理;并通过各种电压系统的对比确定了本船的电压;针对不同变频设备的特点,详细介绍了直流母线技术和有源前端（AFE）变频技术的具体应用。同时介绍了本船电缆和配线的特点,以及各种辅助电源的适用范围,为国内开展自主设计提供参考和借鉴。     

可控相复励无刷励磁系统仿真

相复励无刷励磁系统是船舶等移动电站中应用较为广泛的一种励磁装置,用于为同步发电机提供励磁功率、调节输出电压和控制无功分配。本文结合实际相复励无刷励磁系统,通过分析各个部分数学模型得出系统传递函数。针对不同工况下的仿真结果表明,所建立的模型能够较为准确地反映同步发电机的动态特性。     

珠三角城际轨道交通枢纽站点布局研究

珠三角城际轨道交通线网要求＂统一规划、统一建设、统一标准、统一运营＂,线网内部要求实现互连互通、运营灵活、资源共享,需要进一步深入研究＂互连互通＂的内涵。阐述了城际轨道交通综合交通枢纽的设计新理念,提出了基于珠三角城际轨道交通线网的枢纽站点分类和衔接原则,通过研究主要枢纽站点衔接方式,初步形成了珠三角城际轨道交通枢纽的基本框架。