The evaluation of the spatial integration of station areas via the node place model; an application to subway station areas in Tehran

Urban planners usually consider the transportation system and land use systems in different ways. The node place model is an analytical tool that explores the interaction between the transportation and land use systems in station areas in an urban region. The essential issue with the node place model is spatial. To address this issue, spatial indices are added to the model. Another purpose of this paper is to provide a procedure to identify the most effective transportation and land use dynamics in station areas. In this respect, canonical correlation analysis was conducted on data concerning Tehran’s subway stations. The resulting spatial indices have a fairly logical relationship with other transportation and land use indices, and it is useful to incorporate these indices in the node place model. The case studies demonstrated that a well-integrated, continuous and dense spatial configuration of the street network in station areas is associated with an increase in the variety and intensity of activities, an increase in the workforce and better accessibility for the station by attracting greater pedestrian movement. Additionally, these case studies indicated that to sustain a station area, the streets that exist in a station area and the streets that are connected to a station should be connected to the streets that locally benefit from well-integrated areas within fewer steps.     

Real time transit demand prediction capturing station interactions and impact of special events

Demand for public transportation is highly affected by passengers’ experience and the level of service provided. Thus, it is vital for transit agencies to deploy adaptive strategies to respond to changes in demand or supply in a timely manner, and prevent unwanted deterioration in service quality. In this paper, a real time prediction methodology, based on univariate and multivariate state-space models, is developed to predict the short-term passenger arrivals at transit stations. A univariate state-space model is developed at the station level. Through a hierarchical clustering algorithm with correlation distance, stations with similar demand patterns are identified. A dynamic factor model is proposed for each cluster, capturing station interdependencies through a set of common factors. Both approaches can model the effect of exogenous events (such as football games). Ensemble predictions are then obtained by combining the outputs from the two models, based on their respective accuracy. We evaluate these models using data from the 32 stations on the Central line of the London Underground (LU), operated by Transport for London (TfL). The results indicate that the proposed methodology performs well in predicting short-term station arrivals for the set of test days. For most stations, ensemble prediction has the lowest mean error, as well as the smallest range of error, and exhibits more robust performance across the test days.     

新型节能材料在严寒地区高铁站房的应用研究——以齐齐哈尔南站为例

严寒地区站房节能设计是设计中重点考虑的问题,优秀的节能设计不仅可以给室内提供舒适的热环境,也降低能耗。近年来新型节能材料的不断出现为节能设计提供新的方向,齐齐哈尔南站节能设计中在屋面、墙体、玻璃幕墙等部位使用多项新材料,有效降低围护结构的传热系数,阻止室内热量向室外散失,经使用后实地测试室内温度均超过设计温度。     

“爆刻技术”在岩壁梁部位开挖中的研究与应用

结合向家坝水电站岩壁梁部位工程地质条件和设计轮廓复杂、质量要求高的特点,施工中首次提出了“爆刻技术”这一新的爆破技术术语和理念。详细介绍该项技术的施工程序、施工方法、控制爆破设计和具体的施工工艺及爆破振动观测。施工中推行的精细化科学管理措施,确保了岩壁开挖成型质量优良,创造了光爆孔半孔率近100%、岩台平均超挖2.9cm的新纪录。     

道岔选型对重载铁路车站通过能力影响的研究

在一定行车条件下,计算不同道岔型号和列车牵引质量对应的列车起停车附加时分、单线铁路运行图周期和双线铁路列车追踪间隔时间,在此基础上计算得到相应条件下重载单、双线铁路车站的通过能力.根据不同道岔型号对车站通过能力影响的分析,对于重载单线铁路车站,在列车牵引质量低于1万t时建议采用9号道岔,当列车牵引质量达到1万t及以上时建议采用12号道岔,仅当列车牵引质量都达到2万t且在场坪条件允许时采用18号道岔;对于重载双线铁路车站,当列车牵引质量在2万t以下时建议采用12号道岔,当列车牵引质量达到2万t且场坪条件允许时建议采用18号道岔.     

昆明局集团公司卸车能力提升对策

为提升昆明局集团公司卸车能力,满足全路货运装车需求,阐述卸车能力影响因素,从系统角度构建铁路三级服务卸车系统,包括运输通道子系统、枢纽作业子系统与货运站点作业子系统.针对昆明局集团公司卸车能力紧缺的现状,分析各级服务子系统的能力,提出相应的能力提升措施,并分析其效果.经研究可知,通过实施运输组织优化、车流径路调整、货运...     

开放式收费站收费方式的发展方向

伴随着收费公路的快速增长,开放式收费以其投资小和方便车辆通行等优势,已经越来越为社会所接受。研究开放式收费站收费方式的发展方向对于解决因车辆缴费造成交通阻塞等问题具有一定的意义。     

深圳北站综合枢纽在"高铁链接城市"中的探索

深圳北站是深圳的高铁火车站,高铁如何与城市链接,突破传统火车站的模式,是深圳北站综合枢纽建设过程中积极探索研究的重要课题.从总体布局、轨道交通规划,功能布局设计等方面,分析深圳北站综合枢纽的设计方案,并总结和提炼出深圳北站综合枢纽设计中贯穿的"八大理念".     

HI-FI AUDIO CODING TECHNOLOGY FOR ISDN

＠黄晓利＠陈健ＩｎｔｒｏｄｕｃｔｉｏｎＴｏｄａｙｍｏｒｅａｎｄｍｏｒｅｈｉｇｈ－ｑｕａｌｉｔｙ，ｄｉｇｉｔａｌｓｔｅｒｅｏｍｅｄｉａａｒｅｉｎｔｒｏｄｕｃｅｄｔｏｔｈｅｐｕｂｌｉｃ，ｉｎ－ｃｌｕｄｉｎｇＣＤ，ｄｉｇｉｔａｌａｕｄｉｏｔａｐｅ（ＤＡＴ），ｍｉ...     

Taylor四相编码信号脉冲压缩算法优化与仿真

通过对Taylor四相编码信号的研究，分析了其优缺点，并根据其不足和雷达信号处理中的实际情况，提出多普勒频率多通道补偿法和频域旁瓣抑制法，并进行仿真。仿真结果表明，这两种方法是可行的，较好地改善Taylor四相编码信号的脉冲压缩性能。