Search results for "RAILWAY"
showing 10 items of 76 documents
A topological phase transition between small-worlds and fractal scaling in urban railway transportation networks?
2009
Abstract Fractal and small-worlds scaling laws are applied to study the growth of urban railway transportation networks using total length and total population as observational parameters. In spite of the variety of populations and urban structures, the variation of the total length of the railway network with the total population of conurbations follows similar patterns for large and middle metropolis. Diachronous analysis of data for urban transportation networks suggests that there is second-order phase transition from small-worlds behaviour to fractal scaling during their early stages of development.
A framework for defining a sustainability rating system for railway track-beds
2017
Railways perform a significant role in the transportation system and they have relevant environmental, economic and social impacts. They are currently engineered optimizing every singular aspect rather than considering a broader system for improving the sustainability of the overall infrastructure. Thus, it is necessary to promote an effort to define a global sustainability framework for conceiving the design, construction and management of railway infrastructure. The Sustainable Rating System (SRS) proposed in this paper is a tool under development that evaluates different alternatives of railway track-bed structure. Inspired by similar efforts in the field of road engineering such as Gree…
CHARACTERIZATION OF RUBBERIZED ASPHALT FOR RAILWAYS
2018
Rubberized asphalt mixtures are regarded as a solution for improving the strength of the rail-track section. The recycled rubber has become an enhancer of the modified bituminous mixtures. In this work, it has been shown as a sustainable improvement option in HMA mixes due to the elastic behavior exposed by the rubber particles. The impact of thermal susceptibility on the mechanical properties of the railway bituminous sub-ballast layer has served to the advanced measurement of the thermal cycles inside the rail track. Different simulations following the Kentrack and Kenpave software were employed to be effective with the best mix-design for railways. According to weather situation, reviewe…
Robustness in railway transportation scheduling
2008
Railway scheduling has been a significant issue in the railway industry. Over the last few years, numerous approaches and tools have been developed to compute railway scheduling. However, robust solutions are necessary to absorb short disruptions. In this paper, we present the robustness problem from the point of view of railway operators and we give some guidelines to measure robustness in timetabling. We have developed some formulae to compare robustness between two timetables based on the study of railway infrastructure topology and buffer times. Thus, each buffer time is pondered by some factors such as tightest tracks, number of subsequent trains, remaining stations, etc. This method i…
In the rail sector, France needs to do more to connect its regional networks to the European network
2023
In an article for "Le Monde" newspaper, the legal expert Martial Pernet notes that, despite the texts in force, which he urges to be applied, efforts must be made to achieve the unification of the European rail network.
Transportation noise and risk of stroke: a nationwide prospective cohort study covering Denmark
2021
AbstractBackgroundStudies on transportation noise and incident stroke are few and inconclusive. We aimed to investigate associations between road-traffic and railway noise and the risk of incident stroke in the entire Danish population.MethodsWe estimated road-traffic and railway noise (Lden) at the most and least exposed façades for all residential addresses across Denmark (2.8 million) for the period 1990–2017. Based on this, we estimated the 10-year time-weighted mean noise exposure for 3.6 million Danes aged >35 years, of whom 184 523 developed incident stroke during follow-up from 2000 to 2017. Analyses were conducted using Cox proportional-hazards models, with adjustment for va…
Control of spontaneous spiral formation in a zwitterionic micellar medium
2011
The transition from planar fronts, trigger waves or solitary pulses to spirals in excitable media, has attracted increasing interest in the past few decades, mainly because of its relevance for biological and medical applications. In this paper we describe a new and convenient method for spiral generation starting from symmetric wavefronts. By using the micelle-forming zwitterionic surfactant N-tetradecyl- N,N-dimethylamine oxide in a Belousov–Zhabotinsky solution, it is possible to control to a large extent the domains where spirals can be spontaneously generated. The mechanism responsible for the wavefront break up lies in the interaction of the propagating waves with the unexcitable regi…
A French railway network history, between HGIS, geohumanities and adjustment tools
2015
International audience
Définir la fiabilité de l'opérateur humain pour concevoir les futurs systèmes autonomes : un regard des Facteurs Organisationnels et Humains
2022
L'intégration de systèmes autonomes dans les transports continuent de progresser afin d'atteindre, à terme, des systèmes entièrement autonomes. Le domaine du transport ferroviaire ne fait pas exception et de nombreux projets, nationaux ou internationaux, sont en cours ou voient le jour. Le transport ferroviaire est réputé sûr. Cela passe notamment par des processus de certification des systèmes ferroviaires déployés. Un principe fondamental de l'assurance de sécurité ferroviaire est : l'intégration d'une nouvelle fonction ou la modification d'une fonction ne doit pas péjorer le niveau de sécurité. Pour vérifier ce principe, le projet TA-SV a fait le choix de réaliser une comparaison par rap…
"…a počínal tušit, že s obrazy to tady nebude jednoduché." Ekfrastyczność (w) powieści "Cesta do pekel" Václava Vokolka
2019
The article analyses the novel Cesta do pekel written by Václav Vokolek – the Czech prose writer, poet and painter – through the usage of the intersemiotic translation strategies. The plot of the text can be characterized as the contamination of the physically plausible historic world (the construction of the railway in the middle of the 19th century) with the implausible one (the infernal story) according to Lubomír Doležel’s typology. Demonstrating the changes in the arts (the clash of romanticism with realism), the novelist sensitizes the reader to the drastic introversion into nature, as exemplifi ed by the urbanization processes in the north of the Czech Republic. At the same time, the…