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为了揭示水源水库沉积物中的营养元素分布对水体富营养化的影响,以周村水库为研究对象,采用现场取样及实验室分析方法,探究了沉积物中营养元素的分布特征,并对TOC与TN、TP的相关性进行了分析,同时参考沉积物质量评价指南并采用综合污染指数对沉积物的污染状况进行了评价. 结果表明,周村水库研究区域沉积物TOC含量均随深度增加而下降,而沉积物中氮负荷有增加的趋势,磷则表现出表层富集现象,表明周村水库沉积物营...
Evaluating Alternative Toll-Based Financing Approaches: A Case Study of the Boston Metropolitan Area
Alternative Toll-Based Financing Approaches the Boston Metropolitan Area
2014/10/22
The current condition of the nation’s transportation system is of great concern to State Departments of Transportation. Currently, funds in many state transportation budgets are depleting. Nowadays, S...
Route Choice Behavior in a Driving Simulator With Real-time Information
Route Choice Behavior a Driving Simulator Real-time Information
2014/10/22
This research studies travelers' route choice behavior in a driving simulator with real-time information en-route. We investigate whether travelers plan strategically for real-time information en-rout...
Route Choice Behavior in Risky Networks with Real-Time Information
Route Choice Behavior Risky Networks Real-Time Information
2014/10/22
This research investigates route choice behavior in networks with risky travel times and real-time information. A stated preference survey is conducted in which subjects use a PC-based interactive map...
Value of Traveler Information for Adaptive Routing in Stochastic Time-Dependent Networks
Value of Traveler Information Adaptive Routing Stochastic Time-Dependent Networks
2014/10/22
Real-time information plays an important role in travelers’ routing choices in an uncertain network by enabling online adaptation to revealed traffic conditions. The quality of the information affects...
AN ANALYSIS OF THE SAFTEY EFFECTS OF CROSSWALKS WITH IN-PAVEMENT WARNING LIGHTS
THE SAFETY EFFECTS CROSSWALKS IN-PAVEMENT WARNING LIGHTS
2014/10/22
Pedestrian safety is among one of the largest concerns in the transportation profession. Many treatments have been developed and implemented to improve pedestrian safety. This current research focuses...
基于用户需求的农村安全饮水工程契合度评价模型构建
用户需求 农村安全饮水工程 契合度 评价模型
2015/9/14
以四川省绵阳市游仙区农村安全饮水工程为例,借助因子分析法与层次分析法构建了基于用户需求的农村安
全饮水工程契合度评价模型。其中,二级指标对于一级指标的权重系数由因子分析提取公因子的贡献率确定,三级
指标对于二级指标的权重系数由层次分析的主观权重和因子分析的客观权重最终确定。研究表明,水费定价收费
标准的合理性、饮水资源获取的便捷性、工程建管质量的可靠性成为众多影响契合度因素中的主要因素。模型...
众所周知，疏浚是湖泊治理和航道疏通等方面最常用的施工措施之一，淤泥固化技术则是疏浚淤泥，并使其得到资源化利用的有效途径之一。在这一技术中，有机质的含量是具有较大影响力的一个指标。在淤泥固化研究领域，论有机质对淤泥固化的影响作用及解决办法是一个全新的课题，将会为该领域的研究提供更多可参考的资料。笔者将从室内试验研究的方向来探讨有机质对淤泥固化的影响作用，并根据实际问题探索出有效的解决办法。
城市供热系统的震害和抗震措施
供热系统 震害 抗震措施
2014/7/7
城市集中供热系统是现代化城市的生存和发展的生命线工程之一，更是中国北方城市重要的生命线工程。本文通过介绍了中国城市集中供热系统的组成，分析了供热系统中供热管网和热源的震害特点，提出了针对城市集中供热系统的抗震技术措施，从而提高供热管网和热源的抗震性能。
Strategic Statement
Strategic Statement Gas AVAILABLE ACCEPTABLE ACCESSIBLE ADAPTABLE AFFORDABLE
2013/11/18
This IGU vision recognises the unique role that gas plays in satisfying rising energy demand and in mitigating climate change.
This publication is produced under the auspices of the INTERNATIONAL GAS UNION (IGU) which holds the copyright.This publication may not be reproduced in whole or in part without the written permission...
The report on “Wholesale Gas Price Formation” first published in June 2012 for the World Gas Conference in Kuala Lumpur, has now been updated by Study Group 2 of the IGU Strategy Committee (PGCB). The...
流场物理特性在脉动风压系数估算中的应用
物理特性 平均风压 湍流动能 脉动风压系数
2013/10/11
利用数值模拟技术计算脉动风压需要进行非定常瞬态模拟,计算量过大. 为了提高计算效率,文章根据准定常理论,用预测点高度的入口风速代替参考点高度风速,修正了Paterson、黄本才等人提出的脉动风压估算公式. 通过由CFD 模拟得到的独立柱支撑平板结构的平均风压系数、参考点风速、湍流动能等参数估算了其脉动风压系数,发现大多数工况下与风洞试验结果相吻合. 研究表明,可以利用定常模拟计算结果中获得的参数估...
合流制排水管道雨季出流污染负荷研究
合流制 雨季溢流污染 管道沉积物 污染负荷
2013/11/8
针对北京城区合流制排水管道雨季溢流及雨后河道水质恶化等问题,研究了3场降雨期间合流制排水系统不同来源的污染物特性及污染贡献.通过对2012年雨季几场降雨的降雨量数据监测与统计发现,护城河沿岸合流制排水系统累积雨量约10 mm时发生溢流.特大暴雨情况下,溢流水质的污染物平均浓度高于排水系统旱流污水的污染物浓度,溢流水质差,污染物浓度范围为:TN 5.11~16.36 mg·L-1,TP 4.34~1...