全地下式雨水泵站及调蓄池在世博会园区中的应用

为解决初期雨水直排水体所带来的水环境污染问题,同时为合理利用地下空间并尽量减小泵站和调蓄池对周边环境的影响,世博园区后滩雨水泵站及调蓄池设计为全地下式合建排水构筑物。该文详细介绍了该工程的设计规模和调蓄池的布置、设计计算及运行模式等,并对工程特点和注意事项进行了总结,在类似工程中可结合其工程自身特点予以应用。     

济南市“7.18”特大暴雨洪水灾害成因分析及对策

2007年7月18日,济南市遭受了特大暴雨洪水灾害袭击,造成了严重损失。该文重点分析了"7.18"洪灾发生的主要原因,提出了完善济南市城市防洪体系的主要对策。     

Analysis of taxi demand and supply in New York City: implications of recent taxi regulations

This paper investigates temporal and weather-related variation in taxi trips in New York City. A taxi trip data-set with 147 million records covering 10 months of activity is used. It is shown that there are substantial variations in ridership, taxi supply, trip distance, and pickup frequency for different time periods and weather conditions. These variations, in turn, cause variations in driver revenues which is one of the main measures of taxi supply–demand equilibrium. The findings are then used to discuss the anticipated impacts of two recently enacted taxi regulation changes: the first fare increase since 2006 and the E-Hail pilot program which allows taxi hailing with smart phone applications. The fare increase is estimated to cause varying levels of revenue increase for different time periods. E-Hail apps are not expected to offer considerable improvements at all times, but rather when both adequate taxi supply and demand occur simultaneously.     

Telecommuting and urban sprawl

This study examines what happens to city size when telecommuting occurs. It assumes that more telecommuting occurs when telecommuters’ labor cost share increases and/or workers adopt a more favorable attitude toward working from home. The study shows that telecommuting produces opposing forces that regulate the city size, one centralizing and the other decentralizing urban activities. These forces are examined in a city where workers and firms are given the option to freely mix working at the office and at home, and the city’s land use is endogenously determined. A rise in the productivity of an economy due to telecommunications technology could work to centralize urban activities, while urban contraction can occur with a fixed city population.     

基于引力模型的陇南市对外交通发展研究

基于城市研究领域已广泛应用的引力模型,以我国甘陕川交界区域陇南市为例,进行区域对外交通发展趋势分析.首先采用断裂点(Breaking Point)模式计算出了陇南市到周边10座同级相邻城市的断裂点位置,然后把断裂点连接起来,确定了陇南市中心城市武都区的吸引范围.之后根据城市吸引范围与市城所辖行政范围不重叠区域的面积大小以及形状走势,明确指出了陇南市对外交通的7大出口方向;并以此着重对陇南市作为三省交界区域的对外交通空间发展趋势进行了分析和预测,同时做了相应区域对外交通规划的建设构想.     

既有拱桥的静动载试验与分析

通过对一座多种结构型式构成,设计荷载等级差异较大的拱桥的静动载试验研究,鉴定了其实际承载能力及使用性能,判别了其对既有交通状况的适应性。这将对同类桥梁的拓宽改造、管理和养护具有一定的参考价值。     

浅谈排水工程中管材的选用

该文综合分析比较了排水工程中HDPE管和钢筋混凝土管的技术性能和工程造价,并结合莆田市荔港大道工程实践情况,对HDPE管的选用和施工注意事项进行探讨。     

城市防洪规划的理念转变——从改造到适应

频繁爆发的洪水灾害证明人定胜天、改造自然的防洪思路已不能解决防洪问题,人类必须探索更为理智的、科学的防洪方法,适应洪水、与洪和谐相处的现代防洪理念应运而生。为此,结合新一轮济南市城市总体规划———城市防洪规划的编制,探讨了基于现代防洪理念编制城市防洪规划的热点问题,认为在编制城市防洪规划时要合理利用土地、强调雨洪资源化利用、重视滞蓄洪区的规划、河道治理采用生态型河道,并采取防洪非工程措施。     

Assessing the impact of cornering losses on the energy consumption of electric city buses

In view of the increasing electrification of public city transport, an accurate energy consumption prediction for Battery Electric Buses (BEBs) is essential. Conventional prediction algorithms do not consider energy losses that occur during turning of the vehicle. This is especially relevant for electric city buses, which have a limited battery capacity and often drive curvy routes.In this paper, the additional energy consumption during steering of a BEB is modeled, measured, and assessed. A nonlinear steady-state cornering model is developed to establish the additional energy losses during cornering. The model includes large steer angles, load transfer, and a Magic Formula tire model. Model results show that both cornering resistance and tire scrub of the rear tires cause additional energy losses during cornering, depending on the corner radius and vehicle velocity.The energy consumption model is validated with full scale vehicle tests and shows an average deviation of 0.8 kW compared to the measurements. Analysis of recorded real-world bus routes reveals that on average these effects constitute 3.1% of the total powertrain energy. The effect is even more significant for routes crossing city centers, reaching values up to 5.8%. In these cases, cornering losses can be significant and should not be neglected in an accurate energy consumption prediction.     

济南市公交都市建设保障机制研究

济南是全国公交都市建设示范工程第一批创建城市之一,本文在分析济南市公交都市建设存在的主要问题的基础上,通过对比国家建设要求,提出了加快济南市公交都市建设的保障机制对策。