南宁市白沙大桥北岸节点改造及其效果评价

文章以南宁市白沙大桥北岸节点改造设计为例,探讨城市道路平面交叉口改造设计的思路,同时从整体交通路网着眼,介绍采用交通仿真对改造效果进行评价的方法。     

钢桥面铺装环氧沥青配合比设计及性能研究

桥面铺装是桥梁行车体系重要的组成部分,它的好坏直接影响到行车的安全性、舒适性、桥梁耐久性以及投资效益和社会效益。结合上海昌吉东路大桥的有关情况,总结介绍了钢桥面铺装环氧沥青材料要求、配合比设计,同时对钢桥用环氧沥青的水稳定、高温稳定性以及变形协调性进行研究。研究结果表明：钢桥用环氧沥青具有优良的高温稳定性能和水稳定性能,相比其他混合料它也有较强的变形协调性能。     

双级制动踏板机构性能分析

建立了一种双级制动踏板机构的运动性能、力传动性能和人机工程学分析模型,并根据此模型对两种轿车双级踏板机构性能进行了分析,提出了将双级踏板机构力传动比等效转化为单级踏板机构的计算方法。研究了制动过程中人体各关节运动角的变化,并依据此参数对踏板机构人机工程学进行评价。提出了双级踏板机构初始位置的设计方法,可保证制动踏板实际使用的最大行程点位于踏板总设计行程的中间位置,此时制动踏板比可达最大值。     

基于支持向量机的沥青路面使用性能评价

路面使用性能决定了路面维修养护的方法。但沥青路面使用性能4个指标：PCI、SSI、SRI和IRI中路面状况指数检测困难。支持向量机是具有严格统计学习理论的新型学习方法。它对解决小样本非线性等问题具特有的优势。基于支持向量机理论,分析沥青路面使用性能4个指标间的关系,建立了SSI、SRI、IRI实测数据对PCI的预测模型,获得了令人满意的预估效果。结果表明,支持向量机是沥青路面性能评估的简单有效的方法。     

早期修建低等级公路路面结构大修设计技术研究

结合早期修建的低等级公路路面结构设计情况和使用状况,在充分考虑利用旧路路面结构剩余强度、降低大修工程建安费和保证路面使用寿命等的技术思路上,提出了路面结构大修设计方案、水稳层顶面弯沉控制标准。     

Transition to a cyclable city: Latent variables affecting bicycle commuting

An understanding of the key factors influencing bicycle commuting is essential for developing effective policies towards a cyclable city. This paper contributes to this line of research by proposing a methodology for including cycling-related indicators in mobility surveys based on the Theory of Planned Behaviour (TPB), and applying an exploratory factor analysis (EFA) to evaluate the structure of latent variables associated with bicycle commuting. The EFA identified six cycling latent variables: Lifestyle, Safety and comfort, Awareness, Direct disadvantages, Subjective norm, and Individual capabilities. These were complemented with a latent variable related to habit: Non-commuting cycling habit. Statistical differences and regression analysis were applied with the cycling latent variables. The study also includes the relationship between objective factors and bicycle commuting, which reveals minor associations. This methodology was applied to the “starter cycling city” of Vitoria-Gasteiz (Spain). The results confirm that in this context – in transition to a cyclable city – safety and comfort issues are not the main barriers for all commuters, although more progress needs to be made to normalise cycling. A set of customised policy initiatives is recommended in the light of the research findings, including marketing campaigns to encourage non-commuting cycling trips, bicycle measures to target social groups as opposed to individuals, bicycle-specific programs such as “Bike-to-work Days”, and cycling courses.     

Development of a Human Use Objectives Framework for Integrated Management of the Eastern Scotian Shelf

Under the 1997 Oceans Act, Fisheries and Oceans Canada (DFO) is required to lead and facilitate the development of integrated management plans for Canada's oceans. One of the integrated management projects is the Eastern Scotian Shelf Integrated Management Initiative (ESSIM), through which DFO is working with a range of stakeholders to develop and implement an integrated ocean management plan for the eastern Scotian Shelf. As part of this Initiative, DFO has undertaken a program to develop a set of objectives and related indicators for ocean management. This includes the development of a framework, objectives, and indicators for human use of the resource including the social, economic, and institutional (governance) components of ocean management, areas that have received little attention internationally. This article provides some background to ESSIM and human uses of the resources of the eastern Scotian Shelf; briefly reviews objectives-based management and human use objectives internationally; outlines the process undertaken to develop the Human Use Objectives Framework; presents the resultant objectives and indicators that were developed; and highlights some of the lessons learned and challenges for their implementation.     

新经济形势下构建企业业绩评价系统的思考

文章研究了现行的三种业绩评价系统的发展历程以及我国业绩评价系统的不足,并提出了构建业绩评价系统的具体改进思路,具有一定的参考价值。     

车用玻璃纤维增强塑料的应用

玻璃纤维增强塑料强度高，在力学性能、老化性能、热性能及工艺性能等方面都具有很大优势，因此在汽车上的应用日益增多。文章根据玻璃纤维增强塑料的用途，介绍了其性能优势，并分析了玻璃纤维增强塑料在交通、车辆制造等方面的现状，指出其发展趋势。玻璃纤维增强塑料产品的发展前景相当广阔，在交通车辆、建筑领域、基础设施及环境保护等方面具有很大的使用价值。     

内燃机万有特性试验曲线的绘制

使用同一组数据，由不同的试验人员绘制内燃机的万有特性曲线时，将使曲线的形状存在着差异。为尽量减小这种人为因素所造成的误差，提高试验精度，介绍了一种绘制内燃机万有特性曲线的方法。提出了原始特性曲线的概念，并分析了它对万有特性曲线的影响。