重载交通柔性路面结构设计研究与应用

车辆超载是一个普遍存在的问题,对道路路面的正常使用具有很大影响,是道路路面使用初期产生严重破坏的主要原因.结合深南路的路面修缮工程,分析重载交通柔性路面结构修缮所面临的实际问题.     

中美新能源汽车产业政策解析

燃油供求矛盾和环境污染问题日益突出的今天,发展新能源汽车已经成为国家战略之一。本文通过解读中美新能源汽车产业政策,对现今我国新能源汽车政策之不足进行分析并提出对策,为推进我国新能源汽车产业发展提供借鉴。     

上海市中心区实施非机动车绿色通道的理念与方法研究

在分析上海市中心区交通特征基础上,根据非机动车交通出行特征,强调了非机动车绿色通道的重要性,并阐述了建议非机动车绿色通道的理念与方法。     

How Much Are Car Purchases Driven by Home Equity Withdrawal?

Previous research indicates that changes in housing wealth affect consumer spending on cars. We find that home equity extraction plays only a small role in this relationship. Consumers rarely use funds from equity extraction to purchase a car directly, even during the mid‐2000s’ housing boom; this finding holds across three nationally representative household surveys. We find in credit bureau data that equity extraction does lead to a statistically significant increase in auto loan originations, consistent with equity extraction easing borrowing constraints in the auto loan market. This channel, though, accounts for only a tiny share of overall car purchases.     

地方政府融资平台发展综述

地方政府融资平台是在我国投融资体制改革的过程中产生的,目前已成为地方政府运用市场手段建设公共基础设施的重要载体。地方政府融资平台的发展历程包含4个阶段,包括初创萌芽阶段、起步探索阶段、稳步发展阶段、扩张繁荣和规范发展阶段,各阶段展示出了不同的特点和发展规律。     

道路车辆路试实录动态环境条件的实验室检测标准化

汽车路试实录动态环境条件实验室再现会存在差异,而影响产品评估的可比性和互认,本文对如何在实验环境中“路谱”再现标准化过程及要素进行阐述,同时列举了一些验证中可能产生影响的因素。供拟订试验谱或试验设计时参考。     

基于情感分析的新能源汽车用户评论语义网络分析与主题建模

新能源汽车的发展进入重要战略机遇期,基于用户评论的文本挖掘能够明确消费者需求、把握产品优劣特性,从而促进市场良性发展。聚合多家汽车网站关于新能源汽车的在线评论数据,在情感倾向分类基础上进行深度挖掘。结果显示：用户对新能源汽车的整体情感倾向呈积极;用户在新能源汽车的空间舒适性、外观和驾驶感受等方面积极体验较高,尤其对其代步出行、外观及空间、节能环保等方面认可度高;而消极体验主要体现在续航能力、舒适性、内饰做工和硬件设施等方面,尤其对内饰做工、电力消耗等方面颇有微词;进一步的LDA主题分析发现,新能源汽车的加速动力、外观、操控、空间、节能环保等优势特征显著,但其智能网联、内饰做工、充电基础设施等方面劣势较为突出。基于此,提出针对性的新能源汽车生产及营销策略优化建议,以期有效提升用户体验,助益新能源汽车产业发展。     

面向双智城市基础设施建设的标准化设计探讨

随着智慧城市基础设施与智能网联汽车协同发展的加速推进,智慧交通、城市治理、5G通讯、无人驾驶等领域的迅猛发展,使交通路口处出现杆体林立错综复杂、箱体分散杂乱无章的现象。通过创新首个多杆合一、多感合一、多箱合一的“双智标准路口”设计方法,实现智慧城市基础设施和智能网联设备的系统化布局。该设计理念已在北京市高级别无人驾驶示范区落地实施完成,于60 km2内城市道路实现车路云一体化功能覆盖。     

Infrastructure development for alternative fuel vehicles on a highway road system

A new mathematical model for positioning alternative fuel (AF) refueling stations on directed-transportation networks with the objective of maximizing the coverage of path flow volume is proposed. This model is especially designed for developing an AF infrastructure on toll roads and other highways, where vehicles do not need to exit the road network for refueling, some candidate station locations are not located at interchanges, and some stations may only service vehicles on one driving direction. The proposed model is applied to the Pennsylvania Turnpike System using the 2011 truck traffic data and considering different vehicle driving ranges.     

A heuristic approach for the green vehicle routing problem with multiple technologies and partial recharges

This paper presents several heuristics for a variation of the vehicle routing problem in which the transportation fleet is composed of electric vehicles with limited autonomy in need for recharge during their duties. In addition to the routing plan, the amount of energy recharged and the technology used must also be determined. Constructive and local search heuristics are proposed, which are exploited within a non deterministic Simulated Annealing framework. Extensive computational results on varying instances are reported, evaluating the performance of the proposed algorithms and analyzing the distinctive elements of the problem (size, geographical configuration, recharge stations, autonomy, technologies, etc.).