百色水利枢纽通航设施工程省水船闸选型方案

广西百色水利枢纽通航设施工程率先采用“省水船闸+升船机+辅助船闸”组合式通航建筑物总体布置方案,其省水船闸带两级独立梯形断面省水池,省水率可达55%。介绍百色水利枢纽通航设施工程通航建筑物形式选择,阐述采用“省水船闸+升船机+辅助船闸”组合方案后,船闸下泄水流进入中间渠道后引起的升船机上游水位波动情况,以及全平衡式升船机在对接过程中对于水位变化的要求。为解决水位波动对升船机安全运行的影响问题,提出非省水船闸+泄水外排方案与省水船闸方案,并对两方案进行技术经济对比分析,最终确定采用省水船闸方案。     

大指挥官PHEV充电系统安规测试与案例分析

随着电动汽车市场占有率逐渐增大,电动汽车安全一直是国家和企业关注的焦点。GB18384电动汽车安全要求,从储能系统、车辆操作安全和故障防护,以及人员触电防护3方面做了详细的要求。本文着重阐述非传导充电系统如何做安规测试以及案例分析。     

道路与环境景观融合设计

针对忻阜高速公路忻州至长城岭段沿线特殊的自然、人文环境特点,结合勘察设计典型示范工程道路与环境景观融合的设计理念,充分利用沿线的自然和人文景观元素,通过科学合理的规划设计,实现了高速公路的线型美、建筑美与自然环境和人文景观的有机结合。     

霍永高速公路交通安全设施设计

在介绍霍永高速公路普通路段交通标志、标线、护栏等交通安全设施设计的基础上,对霍永高速长大纵坡、桥隧结合段、小半径曲线等特殊路段存在潜在的安全隐患进行了分析,并提出相应的交通安全设施设计方案,以消除安全隐患,提高道路利用率。     

高速公路交通安全设施工程设计浅析

针对目前高速公路交通安全设施设计中,技术和设计思想方面存在的问题进行了细致的分析,并结合实践提出了相应的改进建议和意见,为高速公路交通安全设施工程的设计提供合理参考。     

河北省内河水上交通安全管理探析

河北省内河许多水域安全基础设施简陋,缺乏必要的安全保障措施,已严重影响水上交通安全管理工作的正常进行．进而在一定程度上制约地方经济发展。通过对当前河北省内河水上交通安全现状的研究,系统分析我省内河水上交通安全管理的特点。并在法制法规、资金筹措、制度建设等方面提出观点和建议。     

收费公路中相关法律问题的研究

收费公路是我国公路在新的建设环境下的产物,其在我国的发展过程中存在着很多问题,为解决这些问题。就必须提高收费公路制度的法律层次,完善收费公路的法律法规。     

AUV动力电池技术的应用现状及展望

从能量密度、循环寿命和安全性等方面介绍常用动力电池的特点,主要类型包括铅酸电池、锌银电池等传统电池和锂电池、燃料电池等新型电池。结合AUV的发展前景,对AUV对动力电池的发展要求进行分析,对AUV的充电方式进行总结,介绍锂电池管理系统的功能,以期能为新能源驱动的AUV研究提供一定参考。     

Shared autonomous electric vehicle (SAEV) operations across the Austin,Texas network with charging infrastructure decisions

Shared autonomous vehicles, or SAVs, have attracted significant public and private interest because of their opportunity to simplify vehicle access, avoid parking costs, reduce fleet size, and, ultimately, save many travelers time and money. One way to extend these benefits is through an electric vehicle (EV) fleet. EVs are especially suited for this heavy usage due to their lower energy costs and reduced maintenance needs. As the price of EV batteries continues to fall, charging facilities become more convenient, and renewable energy sources grow in market share, EVs will become more economically and environmentally competitive with conventionally fueled vehicles. EVs are limited by their distance range and charge times, so these are important factors when considering operations of a large, electric SAV (SAEV) fleet.This study simulated performance characteristics of SAEV fleets serving travelers across the Austin, Texas 6-county region. The simulation works in sync with the agent-based simulator MATSim, with SAEV modeling as a new mode. Charging stations are placed, as needed, to serve all trips requested (under 75 km or 47 miles in length) over 30 days of initial model runs. Simulation of distinctive fleet sizes requiring different charge times and exhibiting different ranges, suggests that the number of station locations depends almost wholly on vehicle range. Reducing charge times does lower fleet response times (to trip requests), but increasing fleet size improves response times the most. Increasing range above 175 km (109 miles) does not appear to improve response times for this region and trips originating in the urban core are served the quickest. Unoccupied travel accounted for 19.6% of SAEV mileage on average, with driving to charging stations accounting for 31.5% of this empty-vehicle mileage. This study found that there appears to be a limit on how much response time can be improved through decreasing charge times or increasing vehicle range.     

The role of volume-delay functions in forecasting and evaluating congestion charging schemes: the Stockholm case

This paper uses observations from before and during the Stockkholm congestion charging trial in order to validate and improve a transportation model for Stockholm. The model overestimates the impact of the charges on traffic volumes while at the same time it substantially underestimates the impact on travel times. These forecast errors lead to considerable underestimation of economic benefits which are dominated by travel time savings. The source of error lies in the static assignment that is used in the model. Making the volume-delay functions (VDFs) steeper only marginally improves the quality of forecast but strongly impacts the result of benefit calculations. We therefore conclude that the dynamic assignment is crucial for an informed decision on introducing measures aimed at relieving congestion. However, in the absence of such a calibrated dynamic model for a city, we recommend that at least a sensitivity analysis with respect to the slope of VDFs is performed.