从绿化隔离带到绿色通道--以北京市绿化隔离带为例

绿化隔离带概念已经有大约100年的历史,特大城市周围建设绿化隔离带是国际上很多城市改善城市环境质量和防止城市蔓延的一种重要举措.虽然绿化隔离带规划思想在当时是进步的,但是它缺少同时代的绿色通道概念具有的生态和休闲等内在优势.本文主要以北京市绿化隔离带为例,从分析其规划思想和建设实施中存在的问题入手,详细阐述了北京市从绿化隔离带到绿色通道转化的必要性及重要意义,并提出具体实施策略.     

Socioeconomic descriptors of fatal crash rates in the Southeast USA

Over the past decades, the Southeast United States has been experiencing consistently higher fatality crash rates compared to other regions of the country. This region also has lower median household incomes, higher percentages of the population below poverty levels, higher percentage of the area classified as rural, and lower percentages of high school completion and university attainment. It is then possible to hypothesize that accident involvement could be affected by these types of socioeconomic characteristics. The objectives of this study were to identify potential socioeconomic factors that could correlate and contribute to the higher fatality crash rates in the Southeast. Driver and vehicle characteristics from the FARS database were related to socioeconomic and demographic Census variables. Crash rates were obtained using the quasi-induced exposure methodology for single- and multi-vehicle crashes. The results show that these socioeconomic characteristics have an impact on single-vehicle crashes but have no statistically significant impact on multi-vehicle crash rates.     

气体碳氮共渗在自行车中轴上的应用

本文论述了自行车中轴零件由氰盐液体渗碳改为微机控制气体碳氮共渗工艺的应用研究,优选出的最佳工艺已成功地用于生产。     

主动轮的冷挤压工艺及模具

自行车变速轴零件的冷挤压是我国早期应用无屑加工技术制造高难度复杂零件的典型范例之一,本文以作者的亲身经历回顾了四种内齿、内棘齿零件冷挤压成形的研制过程,着重介绍了其中一种零件的挤压工艺分析、实际生产工序和所用模具的特点,对长期处于保密状态的技术予以适当解密。以真实的科技成果填补了我国技术文献中的空白。     

珠三角区域绿道网建成环境的人地关系评价体系研究框架

本文针对珠江三角洲区域绿道网建成环境现状,总结国内外相关研究进展,从人地关系的概念入手,引入人地关系(MLR)系统动力学模型,在探讨绿道建设中出现的相关矛盾与问题的基础上,提出了以"使用者(人)-绿道(环境)"关系为中心的区域绿道网的建成环境人地关系评价体系研究假设以及研究思路,并进一步阐述绿道网建成环境人地关系评价研究对实现珠三角区域绿道网建设优化发展的深远意义。     

基于PCA-SBM的轨道交通站点接驳评价体系——以厦门市轨道交通站点为例

以慢行交通规划为指导,搭建基于PCA-SBM(主成分分析-基于松弛值测算)的效率评价模型,从管理者视角对厦门市轨道交通单车接驳现状作出评价。研究发现：厦门市站点接驳效率整体偏低,多呈现高投入、中回报的数据表现,需加强高峰日的引导轮次;电子围栏使用率低,应加强政企联动,做好及时的高峰时期车辆调度与用户前端引导,提升用户对电子围栏的感知,推动落实智能化管理。     

浅谈云南怒江美丽公路绿道设计

怒江州是全国深度贫困地区,绿道建设对促进怒江州决战决胜脱贫攻坚、全面建成小康和经济社会发展,完善区域旅游交通基础设施,改善区域环境,促进旅游、文化、体育等相关产业发展,推进怒江大峡谷旅游资源的开发,加快大滇西旅游环线的建设具有重要意义。通过总体设计、路线设计、路基路面设计、桥梁设计、隧道设计、交通标志标线设计的有机组合,践行“绿水青山就是金山银山”的设计理念,绿道工程成为怒江大峡谷里的一道亮丽风景线。     

Consumer adoption of access-based product-service systems: The influence of duration of use and type of product

Access-based product-service systems (AB-PSS) are business models that can potentially decouple the satisfaction of consumer needs from environmental impacts. Hence, they have been promoted for the circular economy. Their sustainability potential has not yet been realised because consumer adoption is lagging. Although this challenge has been studied for two decades, knowledge to identify and address AB-PSS adoption barriers that matter to consumers is lacking. We hypothesise that the duration of use, the time a consumer obtains exclusive access to a specific product (short-term vs. long-term) and the type of product (bicycles vs. clothing) moderate the importance of AB-PSS adoption barriers to consumers. We compared several adoption barriers across four AB-PSS and found that the duration of use and the type of product significantly moderated the importance of some AB-PSS adoption barriers. More specifically, the Effort to access has a higher influence on consumer preference for short-term AB-PSS, whereas Product quality has a higher influence on consumer preference for long-term AB-PSS. We also found that Effort to access and Product characteristics were more important for bicycle AB-PSS, whereas Contamination and Product quality were more important for clothing AB-PSS. These insights help companies to identify and design out key AB-PSS consumer adoption barriers.     

Measuring cycling accessibility in metropolitan areas

Different measures of cycling accessibility have been widely introduced in transportation planning. However, those measurements are mainly restricted by the availability of travel behavior data. In addition, there has been limited comprehensive research on the importance of cycling accessibility to destinations based on the travel time or distance. In this paper, a new index for measuring bikeability in metropolitan areas is introduced. A Cycling Accessibility Index (CAI) is developed for quantifying cycling accessibility within local areas in metropolitan Melbourne, Australia. CAI is defined according to gravity-based measures of accessibility. This index measures cycling accessibility levels in terms of diversity of different land uses, number of activities in statistical areas, and the travel impedance between origins and destinations. The Victorian Integrated Survey of Travel and Activity (VISTA) dataset was used to evaluate the index and investigate the association between the cycling accessibility levels and the number of bicycle trips in local areas. The index is assessed by investigating the association between levels of cycling accessibility and the number of bicycle trips in statistical areas. Key findings indicate that there is a significant positive association between bike trips and the CAI.     

一种电动自行车安全行驶装置

随着电动自行车的普及,其安全性也越来越受到人们的关注。文章重点分析了电动自行车行驶过程中的安全隐患,提出了相关的解决方案。