Search results for "RAILWAY"
showing 10 items of 76 documents
Dzelzceļa letālo traumu rašanās mehānismi un morfoloģija
2020
Ievads: Visā pasaulē viens no noteicošajiem faktoriem, spriežot par valsts labklājību, ir konkrētas pilsētas un valsts transporta sistēmas iespējas. Latvijā pēdējā laikā ātri attīstās un pilnveidojas sliežu transporta iespējas, līdz ar to dzelzceļa transportlīdzekļu radīto traumu risks var pieaugt. Latvijā dzelzceļā iegūtas traumas atrodas otrajā vietā aiz autotraumām transporta traumu grupā. Periodā no 01.01.2010 līdz 01.01.2019 Rīgās, Rīgas rajona, Ogres un Jūrmalas teritorijā tika reģīstrētas 94 uz dzelzceļā iegūtas traumas ar letālo iznākumu. Darba mērķi: Noteikt dzelzceļa letālo traumu ietekmējošos riska faktorus traumas gūšanas brīdī; noteikt dzimuma un vecuma grupu sadalījumu dzelzce…
A Logic Fuzzy Model for Evaluation of the Railway Station’s Practice Capacity in Safety Operating Conditions
2013
Abstract The practice capacity of a railway junction depends, in addition to the effective operation’s conditions, by the potential risk factors related to the design plan of the railway station. With the aim of an approach based on the “fuzzy sets” it is possible to determine the numeric value of the practice capacity by the logic - qualitative relations between the features of the railway junction and the potential risk factors. This methodology permits to try out the absolute value of a suitable vector β, (less then the unit) for the utilization of the theoretic capacity in conditions of maximum reliability of the system related to the aspect of safety (technique “fail safe”).
Service Provisioning and User Association for Heterogeneous Wireless Railway Networks
2017
In addition to comforting passengers' journey, the modern railway system is responsible to support a variety of on-board Internet services to meet the passenger's demands on seamless service provisioning. In order to provide wireless access to the train, one idea attracting increasing attention is to deploy a series of track-side access points (TAPs) with high-speed data rates along the rail lines dedicated to the broadband mobile service provisioning on board. Due to the heavy data traffic flushing into the base stations (BSs) of the cellular networks, TAPs act as a complement to the BSs in data delivery. In this paper, we focus on the TAP association problem for service provisioning in a …
Inwestycje w sieci kolejowej Górnego Śląska w latach 1945−1990
2016
The article presents the changes in railway network in Upper Silesia in the years 1950-1990. In the mentioned period, three main processes of change may be distinguished. The period of the expansion of railway lines, which fell mainly for the years 1950−1980 with varying intensity. Besides the construction of new lines and second tracks, a modernization of technical equipment of the railway lines was undertaken. The period 1960−1990, which included the process of implementing the electrical traction in place of the outdated steam traction and the modern, but expensive diesel traction. The last phase of regression (liquidation) of the railway lines, which indicated the first symptoms in the …
Evaluation de l'impact d'un futur remblai de la ligne à Grande Vitesse Est Européenne sur le risque de gel dans le vignoble de Champagne
2002
In order to evaluate for the vineyard, the additional risk of freezing, which could be generated by a railway embankment of the High Speed Line (TGV «Paris-Strasbourg») a canvas cover of the future embankment (length 480 m, height 3 m maxi) was drawn up in the bottom of a wineyard slope. Measurements of Actinothermal Index (AI) Temperatures, at the height of the bud (at 50 cm of the surface) and measurements of of cold air windslopes, were carried out on a microclimatic scale. We recorded 19 points of measurements, without then with the presence of the canvas cover, for the nights characterized by a radiative cooling (wind £ 2m.s-2, clear sky) during spring 2001. The possible incidence of t…
Assessing the Open Trenches in Screening Railway Ground-Borne Vibrations by Means of Artificial Neural Network
2009
Reducing ground borne vibrations in urban areas is a very challenging task in railway transportation. Many mitigation measures can be considered and applied; among these open trenches are very effective. This paper deals with the study of the effect, in terms of reduction of vertical and horizontal displacements and velocities, of the open trenches. 2D FEM simulations have been performed and several open trench configurations have been analysed varying the main geometric features such as width and depth, distance from the rail, thickness of the soil layer over the rigid bedrock, type of the ground, ratio between the depth of the trench, and the thickness of the soil layer. For quantifying t…
Study of the effectiveness of the open trenches in reducing railway ground-borne vibrations: sensitivity analysis of its geometric features using art…
2009
Problematyka przejmowania infrastruktury kolejowej przez samorząd terytorialny – przykład województwa dolnośląskiego
2021
Regionalny kolejowy transport pasażerski w ostatnich latach dotknięty był zmianami w kontekście organizacji przewozów. Dotyczy to kwestii zarządzania oraz zasięgu obsługiwanej sieci kolejowej. Zauważalne są tendencje do reaktywacji połączeń oraz tworzenia nowych powiązań komunikacyjnych. Jest to związane zarówno z obsługą aglomeracji miejskich, jak i transportu regionalnego. Proces kreowania nowego układu komunikacji kolejowej oparty może być na reaktywacji nieczynnych tras albo budowie nowych połączeń. Procedura przejmowania niewykorzystywanych linii przez samorząd województwa jest elementem odtwarzania pierwotnego systemu kolejowego. Z jednej strony pozwala to na zachowanie infrastruktury…
Cost that is Directly Incurred as a Result of Operating the Train Service on the 1520 mm Rail with Primarily Freight Transportation
2016
AbstractUnder the Directive 2012/34/EU (21 November 2012) “the charges for … [rail] infrastructure … shall be set at the cost that is directly incurred as a result of operating the train service”. This charging rule is new for Baltic States’ railways, where due to the favorable geographic position a full cost application without detalization was possible. Although, a big number of relevant studies on the issue was made in EU, all of them covered only 1435mm railways with primarily passenger transportation. This study has been made in order to understand the impact of train operating on 1520mm rail infrastructure with primarily freight transportation.A gradual model of infrastructure chargin…
Spatial conflicts betweem modernizations of railway lines and natural values A case study of Poznań - Szczecin railway line
2017
One of the most intensive processes in the development of Polish transport infrastructure is currently modernizing main national railway lines. One of them is the railway line between Poznan and Szczecin. During the realization of such projects there occur conflicts in fulfilling different ecosystem functions by landscapes. On the basis of the theory of ecosystem services these conflicts should be solved, and potential projects – optimized. The study evaluates natural values of the areas adjacent to the railway line Poznań - Szczecin within a zone of 250 m, and also identifies areas with varying conflict degrees for the realization of the modernization project. The most important areas of h…