The geotechnical behaviour of ballast materials for railway track maintenance [PDF]
, 2004 The search for an improved mechanised method of maintaining railway track to the correct level and alignment led to the development of the stoneblower, a machine that lifts the rail and attached sleepers and pneumatically injects the required amount of ...
Fair, Peter
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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.
Le Pen, Louis +3 more
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Not all calcite ballast is created equal: differing effects of foraminiferan and coccolith calcite on the formation and sinking of aggregates [PDF]
, 2014 Correlation between particulate organic carbon (POC) and calcium carbonate sinking through the deep ocean has led to the idea that ballast provided by calcium carbonate is important for the export of POC from the surface ocean.
K. Schmidt +9 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
doaj +1 more source
A review of test protocols for assessing coating performance of water ballast tank coatings [PDF]
, 2014 Concerns on corrosion and effective coating protection of double hull tankers and bulk carriers in service have been raised especially in water ballast tanks (WBTs).
Perera, Noel +9 more
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Dependence of shape on particle size for a crushed rock railway ballast [PDF]
, 2013 Laboratory testing of railway ballast poses practical difficulties because the particle size is often too large for most standard apparatus. There are therefore advantages in developing a scaled material whose behavior is representative of the full size ...
Le Pen, Louis +9 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
doaj +1 more source
Studying the Strengthening Effect of Railway Ballast in the Direct Shear Test due to Insertion of Middle-size Ballast Particles [PDF]
Journal of Applied and Computational Mechanics, 2022 This paper summarized some common grading curves of ballast layers and found that the content of 16-32 mm ballast particles ("middle-size particles" in this paper) had a significant effect on the direct shear performance of the ballast layer.
Jianxing Liu +4 more
doaj +1 more source
Eletrônica de Potência, 2008 This paper presents a simple configuration, based on the integration of two flyback converters, to supply high intensity discharge (HID) lamps with a low frequency square waveform (LFSW), in order to avoid the occurrence of the acoustic resonance (AR ...
Tiago B. Marchesan +4 more
doaj +1 more source
Ballast bed resistance characteristics based on discrete-element modeling
Advances in Mechanical Engineering, 2018 In this study, in situ experiments were conducted to study the changing characteristics of the lateral and longitudinal resistance of a ballast bed, and a three-dimensional model for the ballast bed and sleeper was constructed based on the discrete ...
Zhiping Zeng +5 more
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