Activity fragmentation,ICT and travel: An exploratory Path Analysis of spatiotemporal interrelationships

This paper focuses on the interrelationships between ICT, activity fragmentation and travel behaviour. The concept of fragmentation relates to how activities are spatiotemporally reorganized, by subdividing activities into smaller components that are then performed at different times and/or locations, in connection with ICT use. The association between ICT, activity fragmentation and travel relationships remains uncharted. Based on a two-day Dutch communication-activity-travel diary different associations between ICT use, paid work spatiotemporal fragmentation indicators and frequency of travel are specified and tested with Path Analysis Modelling accounting for sociodemographic and land use factors. The results demonstrate that the interrelationships between fragmentation, ICT and travel are quite complex. ICT and fragmentation apparently have a reciprocal relationship with mobile ICT use influencing the degree of spatial fragmentation whereas the usages of sedentary ICT are influenced by the degree of temporal fragmentation. Person-ICT attributes and ICT use mediate the participation in non-work activities, and can replace work and non-work travel. Fragmentation reduces work trips but at the same time restricts non-work personal travel possibilities and can reallocate time for leisure activity and travel.     

热再生养护车的设计及其工作装置驱动功率的平衡

沥青混凝土路面的养护工艺和专用设备的优劣直接关系到道路的服务质量和通车效率，采用热再生养护车是解决这一问题的良好途径。对养护车作业装置的结构设计进行技术优化和驱动功率的平衡分析是高质量养护车研发的基础和技术关键。     

Management Cybernetics: A New Institutional Framework for Coastal Management

This article analyzes institutional arrangements for the delivery of coastal programs through a new way of thinking about their evolution and structure. The notion of three distinct "dimensions" describing the phases in the evolution of institutional arrangements is introduced. The notion of dimensions is developed from conceptualizing about how institutional arrangements are diagrammed. This allows the visualization of how individual institutions and key stakeholders relate to each other in the delivery of coastal programs, how effective these relationships are, and how their relationships could be redesigned. "Dimensional thinking" enables the re-examination of existing institutional design of coastal programs and how these can evolve to meet the challenges of the new millennium. It is concluded that institutional arrangements have grown from a single dimensional view, where institutions (mainly governmental) delivered programs in isolation, through to the present second dimension where agency programs are managed through coordinating bodies and through coastal management plans. It is argued that a third dimension of institutional arrangements, one that recognizes and embraces the rapid pace of change in this century, will be needed that is aligned by themes rather than by organizational structure. To illustrate a third dimension a visualization tool is developed drawing from management cybernetics. It recognizes the increasing importance of formal and informal networks in relation to traditional modernist hierarchical management by recognizing multiple stakeholders (government at all levels, industry, advocacy groups, conservation interests, and the broader community) and their degree of mutual dependence. Dimensional thinking has the potential to institutionalize the interaction between these multiple stakeholders to ensure the effective delivery of coastal programs in the new millennium. A single answer to what the third dimension of coastal management program evolution should include is not presented. Rather, an approach is presented that allows coastal managers to move forward in the debate on redesigning coastal programs to meet today's complex suite of issues, values, and interests. An experimental case study from Western Australia is used to illustrate the potential application of the dimensional thinking to coastal management institutional design in that State's coastal program.     

基于社会公平的城市保障性住房空间布局策略研究

通过梳理城市发展模式,并借鉴国际上有效处理居住社会公平问题的经验,在调查西安市保障房空间分布状况的基础上,就目前保障性住房因空间布局造成的社会公平问题进行分析,着重从建设主体的行为激励、保障性住房的科学规划两个方面提出了若干建议,以有助于解决保障房居民获得公平公共服务和发展机会的问题。     

Collision avoidance analysis for transition taper length

Transition taper length plays a vitally important role in work zone safety operations because too short a transition taper length will result in higher accident risks and too long a transition taper length could increase traffic delay. This paper evaluates transition taper length under various traffic conditions and road geometries using collision avoidance analysis. The longitudinal distances for lane changing and emergency stopping manoeuvres are respectively calculated using collision avoidance analysis. The higher value between the longitudinal lane changing distance and emergency stopping distance is considered as the expected transition taper length. The comparison of transition taper lengths from the collision avoidance analysis and current empirical transition taper formulae shows that the collision avoidance analysis has the capability of evaluating transition taper lengths. This paper also contributes to providing theoretical supports for these empirical formulae.     

制造工艺对焊管力学性能的影响

为获得从热轧板卷或钢板到成品钢管这一过程中材料力学性能的变化规律,针对国内外对于焊管制造不同工序过程中力学性能变化的研究进行了分析.结果表明：制管工艺对钢管的力学性能有显著影响,主要涉及包辛格效应、加工硬化以及应变时效等.制管成型过程的弯曲变形使材料的屈服强度降低,而随后的扩径和/或水压试验以及涂层加热则会明显提高钢管的屈服强度,影响的程度与具体的制造工艺及工序、强度水平等因素密切相关.     

互联互通背景下广西交通外事工作的几点思考

文章依托中国与东盟加强互联互通合作的大背景,对广西交通系统的外事工作现状及问题进行了分析,探讨广西交通系统在互联互通大背景下加强外事工作的方式和对策.     

营运货车“零公里”团购加油可行性分析

文章从营运车辆"零公里"团购加油可行性分析出发,从政策上、技术上等几个方面对在货运站场实行营运货车"零公里"团购加油的可行性进行了充分的阐述和分析,提出了营运货车"零公里"团购加油站点的最小经济规模确定方法和对应的货运站场规模的确定方法,为实施营运货车"零公里"团购加油模式奠定了理论及实践基础。     

Capabilities and Radicalism: Engineering Accessibility in the 21st century

Abstract

Engineering bridges the gap between, on the one hand, that mix of philosophy and politics that we call policy and, on the other, the physical implementation of the means to put policy into practice. Starting with a brief outline of the nature of accessibility, why it is important and how in some cases a person might be disabled by a lack of accessibility, this article – based on the author's Inaugural Lecture given at University College London in February 2005 – turns to consider how a person's needs challenge their capabilities (i.e. what they can do) and considers a radical approach to understanding people's capabilities in the implementation process. Next, the formation of policy intentions in order to permit, encourage and implement the engineering of appropriate solutions is discussed and conclusions drawn about how this affects work in the transport domain. Perhaps we need to look at the world in a different way before we can make it a better place.     

微型桩在桥梁加固工程中的应用

该文简要介绍了微型桩在创业路立交维修加固工程中的应用。阐述了微型桩在桥梁基础加固受空间限制条件下的优势,微型桩与原桩基础的共同协调作用,并探讨了微型桩的承载力问题。