Results 31 to 40 of about 129,371 (270)

Experimental Study on Settlement Behavior of Ballasted Tracks with Polymer Compound-Coated Gravel

Applied Sciences, 2022
The ballast used in ballasted railway tracks transmits load from the rails and ties to the subgrade during train travel, and directly affects the overall track support performance and elastic behavior of the ballasted track.
Jung-Youl Choi
doaj   +1 more source

Sleeper end resistance of ballasted railway tracks [PDF]

, 2014
This paper describes model tests used to investigate how ballast shoulder width and height contribute to a railway sleeper’s resistance to lateral movement for a range of shoulder widths and heights.
Bhandari, A.R., Le Pen, L., Powrie, W.
core   +1 more source

Community structure of benthic macroinvertebrates in reclaimed and natural tidal flats of the Yangtze River estuary

Aquaculture and Fisheries, 2019
Previous studies have found differences between communities of benthic macroinvertebrates living in constructed tidal flats compared with natural ones.
Junzeng Xue, Jiqiang Yang, Qiong Wang, Richard B. Aronson, Huixian Wu   +4 more
doaj   +1 more source

Analysis of a typical railway turnout sleeper system using grillage beam analogy [PDF]

, 2012
A simplified grillage beam analogy was performed to investigate the behaviour of railway turnout sleeper system with a low value of elastic modulus on different support moduli.
Aravinthan, Thiru, Karunasena, Warna, Manalo, Allan, Stevens, Nick   +3 more
core   +1 more source

Analysis And Design Of Two Flyback-based Integrated Converters For The Implementation Of Lfsw Electronic Ballasts

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, Marco Dalla Costa, Marina Perdigão, J. Marcos Alonso, Ricardo N. Prado   +4 more
doaj   +1 more source

High frequency electronic ballast provides line frequency lamp current [PDF]

, 2001
Most electronic ballasts for fluorescent lamps provide a sinusoidal lamp current at the switching frequency. The high-frequency current flowing through the lamp can generate significant radiated noise, which is unacceptable in noise-sensitive ...
Santi, Enrico, Zhang, Zhe, Ćuk, Slobodan   +2 more
core   +1 more source

Influences of ballast degradation on railway track buckling

, 2021
Presently, railway track buckling, caused by extreme heat, is a serious issue that causes a huge loss of assets in railway systems. The increase in rail temperature can induce a compression force in the continuous welded rail (CWR) and this may cause ...
C. Ngamkhanong, S. Kaewunruen, C. Baniotopoulos   +2 more
semanticscholar   +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, Shanyi Song, Weidong Wang, Haijian Yan, Guoshu Wang, Bin Xiao   +5 more
doaj   +1 more source

Biological testing of ships’ ballast water indicates challenges for the implementation of the Ballast Water Management Convention

Frontiers in Marine Science
Ships’ ballast water and sediments are vectors that contribute to the unintentional spread of aquatic non-native species globally. Ballast water management, as well as commissioning testing of ballast water management systems and compliance monitoring ...
Okko Outinen, Sarah A. Bailey, O. Casas-Monroy, Stephanie Delacroix, Sonia Gorgula, E. Griniene, J. Kakkonen, Greta Srėbalienė   +7 more
semanticscholar   +1 more source

Study on the particle breakage of ballast based on a GPU accelerated discrete element method

Geoscience Frontiers, 2020
Breakage of particles will have greatly influence on mechanical behavior of granular material (GM) under external loads, such as ballast, rockfill and sand.
Guang-Yu Liu, Wen-jie Xu, Qi-Cheng Sun, Nicolin Govender   +3 more
semanticscholar   +1 more source