Results 21 to 30 of about 129,371 (270)
Acta Technica Jaurinensis, 2021 This paper presents a short literature review related to the fragmentation of the railway crushed ballast particles. With the help of the processed articles with the main topic of discrete element modelling (DEM) we aim to provide some insight into the ...
Erika Juhász, Szabolcs Fischer
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Applied Mechanics, 2023 The article solves the problem of theoretically determining the deformable characteristics of railway ballast, considering its condition through mathematical modeling. Different tasks require mathematical models with different levels of detail of certain
Dmytro Kurhan +3 more
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A dynamic conductance model of fluorescent lamp for electronic ballast design simulation [PDF]
, 2005 A Spice-compatible dynamic conductance model of a fluorescent lamp for use in electronic ballast simulation is presented. The time-dependent conductance of the fluorescent lamp is derived from a plasma ionization balance equation that uses simplified ...
Devonshire, R. +3 more
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Thermal Management of Led Luminaires Based on Computational Fluid Dynamic
Eletrônica de Potência, 2015 Large LED (light-emitting diodes) clusters are currently designed to replace the lamps commonly used in parks, roadways, tunnels and street lighting. However, the success of these designs is heavily dependent on the performance of the thermal management.
Odirlan Iaronka +2 more
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Rapid analysis & design methodologies of High-Frequency LCLC Resonant Inverter as Electrodeless Fluorescent Lamp Ballast [PDF]
, 2007 The papers presents methodologies for the analysis of 4th-order LCLC resonant power converters operating at 2.63 MHz as fluorescent lamp ballasts, where high frequency operation facilitates capacitive discharge into the tube, with near resonance ...
Ang, Y A +3 more
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Measuring the area and number of ballast particle contacts at sleeper/ballast and ballast/subgrade interfaces [PDF]
, 2015 The number of railway ballast particles in contact with a sleeper may be relatively small. The discrete and non-uniform nature of these contacts may cause breakage and wear.
Abadi, Taufan +3 more
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Railway track condition assessment at network level by frequency domain analysis of GPR data [PDF]
, 2018 The railway track system is a crucial infrastructure for the transportation of people and goods in modern societies. With the increase in railway traffic, the availability of the track for monitoring and maintenance purposes is becoming significantly ...
Fontul, Simona +3 more
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Granular Matter, 2020 In any DEM simulation, the chosen particle shape will greatly influence the simulated material behaviour. For a specific material, e.g. railway ballast, it remains an open question how to model the particle shape, such that DEM simulations are ...
B. Suhr, K. Six
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Calibration for discrete element modelling of railway ballast: A review
, 2020 The discrete element method (DEM) has been confirmed as an effective numerical method for modelling railway ballast, and successfully used to analyse a wide range of ballast-related applications (e.g. geomaterials).
Yunlong Guo +4 more
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Integrated Zeta - Flyback Converter To Supply Hid Lamps
Eletrônica de Potência, 2008 This paper proposes a Metal Halide (MH) lamp electronic ballast based on the integration of Zeta and Flyback converters working in discontinuous conduction mode, in order to provide the ballast power factor correction and to stabilize the lamp current ...
Tiago B. Marchesan +3 more
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