排序方式: 共有23条查询结果,搜索用时 31 毫秒
21.
A renewed interest in public transport analysis and development has triggered a debate among policy makers, practitioners and stakeholders regarding technologies, design, pricing, subsidies and contract forms for optimal policy, including social well-being and the financing of public transport reform. Here we present contents and conclusions of workshop 5 of the Thredbo 12 Conference held in Durban, South Africa, where we analysed a series of recent theoretical developments on the links among demand, technology and the design of public transport systems, which we coupled with the examination of several case studies in order to feed the discussion regarding the relations among the strategic, tactical and operational elements that should be considered when designing a public transport policy. 相似文献
22.
Amaya Alvarez-Ellacuria Alejandro Orfila Maitane Olabarrieta Luís Gómez-pujol Raúl Medina Joaquín Tintoré 《Coastal management》2013,41(6):569-584
A real-time beach hazard level associated with nearshore hydrodynamics is presented in this article. The suitability of the discussed alert system is illustrated via its application to fifteen beaches in the Balearic Islands (Western Mediterranean Sea) providing nearshore safety conditions for beach safety manager. The system provides daily forecasts of nearshore wave conditions using the deep water wave forecasts. The shallow water wave data (wave height, period, and direction) together with the morphology of the site (presence of bars, capes, beach type, etc.) are used to define a hazard level (low, medium, and high) associated with local conditions. The resulting hazard level is transmitted via SMS to lifeguards and local authorities for real-time beach management. The low computational cost of this system after the initial implementation and subsequent calibration results in a very suitable approach for beach management in order to mitigate risks related to local hydrodynamics. 相似文献
23.
In this paper, we analyse the successes and failures of contractual public-private partnerships (PPPs) for delivering and operating transport infrastructure in Spain from the award of the first toll highway concession programme to the present. To that end, we show the risk allocation principles used in Spain and explore the evolution of the contracting approaches over the years. We found that the performance was reasonably good until the arrival of the economic crisis in 2008. Taking advantage of that, we make a review of contractual PPPs for different transport modes and assess the impact that the economic crisis has had on their business performance and the capacity of the central and regional governments to fulfil their commitments with the private sector. This analysis enabled us to identify measures that, if had been applied, would have improved the resilience of these contract during the economic crisis. 相似文献