Search results for "Ilw"
showing 10 items of 93 documents
Increasing the Capacity of Existing Bridges by Using Unbonded Prestressing Technology: A Case Study
2014
External posttensioning or unbonded prestressing was found to be a powerful tool for retrofitting and for increasing the life extension of existing structures. Since the 1950s, this technique of reinforcement was applied with success to bridge structures in many countries, and was found to provide an efficient and economic solution for a wide range of bridge types and conditions. Unbonded prestressing is defined as a system in which the post-tensioning tendons or bars are located outside the concrete cross-section and the prestressing forces are transmitted to the girder through the end anchorages, deviators, or saddles. In response to the demand for a faster and more efficient transportati…
Mono and Stereoscopic Image Analysis for Detecting the Transverse Profile of Worn-Out Rails
2012
AbstractThe purpose of this paper is to suggest a new procedure for reconstructing the transverse profile of rails in operation by means of image-processing technique. This methodological approach is based on the “information” contained in high-resolution photographic images of tracks and on specific algorithms which allow to obtain the exact geometric profile of the rails and therefore to measure the state of the rail-head extrados wear. The analyses and the results concern rails taken from railway lines under upgrading by means of mono- and stereoscopic methods which are appropriate to be employed in laboratory applications or in high-efficiency surveys in situ.
Experienced knowledge for the description of maintenance packages
2015
International audience; The presented work is included in the research theme that specifies some means of capitalization andexploitation of knowledge from experience feedback processes in the context of industrial maintenancemanagement. Our research on it is a more precise definition of the proposed project, built with a problemasking how to handle the management of repair packages. Upstream, the knowledge of various expertsare materialized in the form of expert reports. Downstream maintenance wants to quickly repair productsbased on symptoms or change parts in advance. For this, we propose a methodology by analysing thefeedback to improve the response time for maintenance services. This is…
Two Democracies Work Better Together. French and Italian decision-making processes for the Turin-Lyon railway project.
2013
The Pan-European Corridor V railway line connects Lisbon and Kiev and touches many European countries. The paper present focuses on the Turin-Lyon section where French and Italian authorities jointly work on this huge infrastructure project while applying different approaches. While there are provisions for a public debates on such issues in France, there is no similar institutional framework in Italy. Hence, the analysis allows to compare the dynamics of the public debate in two democratic systems with different public decision-making systems and political cultures. While the French case evidences that public institutions can activate participation by providing “invited spaces” for collect…
Transportation noise and gestational diabetes mellitus: A nationwide cohort study from Denmark
2020
Background: Few studies have investigated whether road traffic noise is associated with gestational diabetes mellitus (GDM), and have yielded inconsistent findings. We aimed to investigate whether maternal exposure to residential transportation noise, before and during pregnancy, was associated with GDM in a nationwide cohort. Methods: From the Danish population (2004–2017) we identified 629,254 pregnancies using the Danish Medical Birth Register. By linkage with the National Patient Registry, we identified 15,973 pregnancies complicated by GDM. Road traffic and railway noise (Lden) at the most and least exposed façades for all residential addresses from five years before pregnancy until bi…
Le vibrazioni in campo ferroviario: analisi f.e.m. dell’interazione convoglio-sovrastruttura-terreno
2003
This paper describes the formulation and application of a finite element method model that simulates the generation and propagation of train-induced vibrations into track-ground system. The F.E.M. model accounts for the interaction between ground, railway, shape of cross-section and train speed. The aim of this research is the evaluation of the influence of each factor on vibrational phenomena.
The influence of transport offer on passenger traffic in the railway transport system in a post-socialist country : case study of Poland
2021
Abstract The study examines factors influencing the number of rail passengers in Poland. The subjects of observation were 62 cities with poviat rights. The main factors influencing demand are the number of connections and the speed of trains. Therefore, we developed an original indicator – weighted number of connections, which takes into account the number of rail connections and the speed of trains. The article can be divided into two main parts: an assessment of the diversification of transport offer and transport demand in spatial terms, and an evaluation of the relationship between the variables. Poland has a large spatial diversity in terms of public rail transport offer and passenger …
Paths and Erratic Emotions of Natural and Cultural Landscapes: Mobility, Slow Fruition and Exploration of Economic Potentiality
2017
In recent years there is greater awareness of the need to match up the large amount of historical and environmental heritage of the Italian territory with the quality and concentration of cultural heritage and tourist services and put them into a network, through a new system of mobility. Urban and territorial policies should identify strategies and projects favoring the connections and use of sites, the perception of landscapes and the subjective emotions they arouse in the community. This interdisciplinary paper aims to rediscover the values and diversity of natural and cultural landscapes in Sicily by following slow routes immersed in valuable rural and urban areas. The proposed investig…
WPŁYW PANDEMII COVID-19 NA FUNKCJONOWANIE REGIONALNEGO TRANSPORTU KOLEJOWEGO OBSZARÓW PRZYGRANICZNYCH – NA PRZYKŁADZIE WOJEWÓDZTWA DOLNOŚLĄSKIEGO (PL…
2021
Systemy zbiorowego transportu publicznego są narażone na wiele zewnętrznych czynników wpływających na ich funkcjonowanie. Jednym z nich może być zagrożenie epidemiologiczne. W 2020 r. światowa pandemia COVID-19 miała istotny wpływ na światową gospodarkę oraz przewozy pasażerskie. Wprowadzone liczne ograniczenia wpłynęły na popyt (liczbę pasażerów) oraz podaż (oferta przewozowa) na rynku transportu. Do najczęstszych obostrzeń zaliczyć można: ograniczenie liczby połączeń, zmniejszenie limitu pasażerów w pojeździe, ograniczenie siatki połączeń komunikacyjnych. W analizie autorzy przeprowadzili badanie województwa dolnośląskiego oraz kraju libereckiego w kontekście zmian w funkcjonowaniu region…
RESTRICTIONS ON REGIONAL PASSENGER TRANSPORT DURING EPIDEMIOLOGICAL THREAT (COVID-19) – AN EXAMPLE OF THE LOWER SILESIAN VOIVODSHIP IN POLAND
2020
The beginning of 2020 was associated with the appearance of the global coronavirus pandemic (COVID-19). The spread of the epidemic caused the introduction of an epidemiological emergency in Poland in early March (on March 12). This resulted in reduced public transport, including regional rail transport. In Lower Silesia, this concerned regional and fast connections. The conducted analysis concerns regional connections and is based on exploration of the spatial and the quantitative aspect of these changes. The transport offer before and after the announcing of the epidemic was analysed. The results showed that most of the transport restrictions concerned the peripheries of the voivodeship (l…