青藏铁路大风天气运输组织方法

青藏高原大风天气多,空气密度小,大风对铁路运输安全的影响与低海拔地区差异较大。利用车辆动力学原理建立列车临界翻车风速模型,分别计算青藏铁路海拔3 000 m和4 000 m冻土和非冻土地区的临界翻车风速和危险翻车风速,以及给定风速条件下车辆限制速度。计算结果表明,青藏铁路临界翻车风速随海拔升高而增大,随冻土路基病害出现而降低。参考英、日等国大风标准,结合青藏铁路的特点,根据危险翻车风速和临界翻车风速,初步提出青藏铁路海拔4 000 m地区安全行车标准及特定运行条件、冻土地区线路出现病害情况下的安全行车标准及特定运行条件。提出列车限速运行、增加车辆载重、提高列车编组水平、提高司机操作水平、改善棚车顶部外形、加强货运检查、注意车辆防溜和风沙地区线路检查等大风天气运输组织措施。     

天津市雨洪水资源化利用的探讨和研究

根据天津市水资源现状及雨洪水调度的优势 ,提出天津市各河系雨洪水调度方案及其成果显示     

Q355GNHD高耐候钢在动车组中的焊接运用

详细介绍了出口突尼斯动车组车体钢结构的特点,通过各部位焊接工艺试验,结合车体钢结构组装焊接工艺,选取了与之匹配的焊接材料Q355GNHD高耐候钢,确定了合适的焊接工艺参数,并制定出该车的生产工艺方案,满足了产品设计的制造需要。     

洞庭湖大桥拉索风雨振控制新技术

随着大跨径斜拉桥的不断建设，斜拉索的减振特别是风雨振的控制已成为该类桥梁急需解决的关键问题之一。岳阳洞庭湖大桥建成通车后已发生多次强烈风雨振，在对应用磁流变智能阻尼减振技术控制风雨振研究的基础上，全面评估了该技术控制拉索振动的实际效果，证明该阻尼器是拉索风雨振控制的有效手段。岳阳洞庭湖大桥全桥安装磁流变阴尼器后，加速度响应降低为原加速度的1/20-1/30。     

Through the storm: Transit agency management in response to climate change

The increase in extreme weather events due to climate change poses serious challenges to public transit systems. These events disrupt transit operations, impair service quality, increase threats to public safety, and damage infrastructure. Despite the growing risk of extreme weather and climate change, little is known about how public managers recognize, experience and address these risks. Using data from a national study of public transit agencies we investigate the types of extreme weather events transit agencies are experiencing, the associated risks, and how agencies are preparing for them. We find that while extreme events are commonly experienced by transit agencies across states and transit managers perceive increased risks from these events, most agencies rely on the traditional emergency management approach to address extreme weather ex post rather than taking a proactive approach to mitigating the adverse weather impact on transit assets and infrastructure ex ante. Managers report that a lack of access to financial resources is the greatest challenge for undertaking adaptation and preparation. We conclude with a discussion of what these findings mean for understanding organizational adaptation behavior as well as climate adaptation policy making.     

Impact assessment of extreme weather events on transport networks: A data-driven approach

The present paper presents a data-driven method for assessing the resilience of the European passenger transport network during extreme weather events. The method aims to fill in the gap of current research efforts regarding the quantification of impacts attributed to climate change and the identification of substitutability opportunities between transport modes in case of extreme weather events (EWE). The proposed method consists of three steps concerning the probability estimation of an EWE occurring within a transportation network, the assessment of its impacts and the passengers’ flow shift between various transport modes. A mathematical formulation for the proposed data-driven method is provided and applied in an indicative European small-scale network, in order to assess the impacts of EWE on modal choice. Results are expressed in passenger differentiated flows and the paper concludes with future research steps and directions.     

污水管网系统节点流量模拟计算

污水管网系统节点流量模拟计算是城市污水管网系统规划设计和运行管理的基础性工作。该文从污水管网系统规划设计和运行管理两个方面阐述了污水管网系统节点流量模拟计算的内涵,并对该领域的未来发展作了展望。     

硅烷浸渍混凝土耐酸雨性能的研究

采用酸雨模拟试验方法,研究了两种硅烷对不同配合比的混凝土耐酸雨性能的影响,重点研究了硅烷浸渍混凝土的外观、体积、质量、强度及吸水率与碳化深度等性能,并建立了硅烷浸渍混凝土的服役寿命预测模型。试验结果表明,无论是否浸渍硅烷,掺磨细高炉矿渣粉的混凝土耐酸雨性能明显优于不掺矿渣粉的混凝土。两种硅烷可有效提高混凝土耐酸雨性能,有效延长混凝土在酸雨环境下的服役寿命。6689硅烷浸渍混凝土的各项耐酸雨性能指标略优于6403硅烷。     

Modelling the impact of weather conditions on active transportation travel behaviour

Three weather sensitive models are used to explore the relationship between weather and home-based work trips within the City of Toronto, focusing on active modes of transportation. The data are restricted to non-captive commuters who have the option of selecting among five basic modes of auto driver, auto passenger, transit, bike and walk. Daily trip rates in various weather conditions are assessed. Overall, the results confirm that impact of weather on active modes of transportation is significant enough to deserve attention at the research, data collection and planning levels.