铁路建设项目的独立安全保障及其欧洲案例

随着世界范围内铁路行业的演变发展,越来越多复杂的流程和先进的技术应用到铁路建设项目中。如何管理这些新的技术和流程以保证运营的安全成为更多铁路建设运营方关注的问题。目前,欧洲广泛采用的独立安全保障,其目的就是在铁路系统投入运营之前为政府、监管机构及其他利益相关方提供安全和服务质量的保证,确保供方交付的系统或设备符合相关法规和标准。论述了铁路建设项目中独立保障的意义、要求、方法以及带来的益处,并给出了在欧洲实施的两个具体案例。     

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.     

只是开始——汉密尔顿专访

比赛才刚刚开始，最多也是热身结束开始了真正的较量。所以一时的失利大可不必听风就是雨，我的赛车是什么水平自己心里最清楚了。     

Can we really measure the impact of port governance reform?

Approaches by governments to reforming the way in which ports are governed are critical to how ports operate and fulfil their roles, and much research is devoted to investigating the impact of such reform. Yet, although the challenges of such research are noted, little attention is devoted to questioning whether measuring such impact is actually possible. We argue consideration of this question is fundamentally important for policy makers and researchers. Specifically, if uncertainty exists regarding whether we have measured the impact of the reform, how can we research its effect or justify its introduction? Conversely, a more conscious consideration of whether we can really measure the impact of port governance reform arguably means a more effective contextualization and rationalization of both policy and research. In this polemical paper, we critically consider three salient areas in relation to whether we can really measure the impact of port governance reform: ‘key terms and their ambiguity’, ‘aspects of time and geography’ and ‘issues of methods and context’. We summarize the key issues and offer suggestions for policy makers and researchers to approach them in an aim to both help measure the impact of port governance reform and also aid future policy development.     

Role of the Travel Factor Convenience in Rail Travel and a Framework for its Assessment

Abstract

This paper reviews the travel factor convenience with particular regard to rail travel. Past research has shown that convenience is a concept readily associated with the private car and its perceived ability to provide a door‐to‐door journey. Private vehicles such as cars are often key competitors to public transport. However, convenience with regard to public transport has proved to be somewhat of an ambiguous concept, often showing a high degree of overlap with the other main recognized travel factors. This paper shows that it is possible to consider convenience in rail travel as an embodiment of four themes: access/egress, station facilities/environment, frequency of service/scheduling and interchange between train services. A list of physically measurable elements can be produced relating to these four themes in order to assess the convenience of any particular station. A categorization process is proposed based upon the initial findings of a questionnaire designed to obtain a user perspective upon convenience. It is concluded that no definitive measure of convenience can be produced for rail travel, although a proxy measure, based upon categorization, containing some or all of the defined elements should be possible.     

一位现代主义者 访盖瑞·麦戈文

汽车设计师盖瑞·麦戈文(GerryMcGovern)的家坐落在无忧无虑的英国乡间,他对自己的这栋现代派宅子相当得意,特地邀我们上门拍摄他的最新杰作、路虎Evoque。车子和宅子本身一样,都停泊在不怎么稳当的斜坡上,两者如面包和果酱一般亲密无间。     

Adjusting the service? Understanding the factors affecting bus ridership over time at the route level in Montréal,Canada

Transportation - Like many cities across North America, Montréal has experienced shrinking bus ridership over recent years. Most literature has focused on the broader causes for ridership...     

Impacts of Terrestrial and Shoreline Stressors on Eelgrass in Puget Sound: An Expert Elicitation

We used expert elicitation to examine potential responses of eelgrass to several restoration strategies in Puget Sound. Restoration strategies included shoreline armor removal and modification, removal and modification of overwater structures, and efforts to improve water clarity via reductions in anthropogenic nutrient and sediment loadings. Expert responses indicated a general belief that reducing stressors would increase eelgrass cover; however, responses varied greatly among stressors. Our analyses revealed that removal of overwater structures, nutrient loading and shoreline armoring will have significantly larger effects on eelgrass recovery than would removal of sediment loading, with removal of overwater structures having the largest effect. We then used a probabilistic model to estimate what actions, singularly or in combination, could yield a large increase in eelgrass cover. Reducing single stressors could, in theory, result in recovery of eelgrass in Puget Sound; however, the magnitude of actions required would be so great that it is likely not practical. In contrast, we identified combinations of smaller reductions of stressors that could achieve significant eelgrass recovery. For example, a 40% reduction in overwater structures, combined with 20% reductions in shoreline armor, and nutrient and sediment loadings, was predicted to be one of the more feasible combinations of actions for meeting the target. The importance of eelgrass to Puget requires prompt input of scientific advice, and this work fills an important knowledge gap in the face of rapidly approaching legislative deadlines. While coded expert opinion of the sort we use here is a weak substitute for data, our work clarifies the current extent of scientific uncertainty that can guide management action in the near term and scientific research in the long term.