Results 31 to 40 of about 551,389 (167)
Limnology and Oceanography: Methods, EarlyView.Abstract Accurate measurements of phytoplankton net primary production (NPP) and calcification are essential for quantifying marine carbon cycling, yet in situ calcification rates remain poorly constrained. We compared 13C‐ and 14C‐based tracer methods for NPP in laboratory cultures of the diatom Chaetoceros tenuissimus and the coccolithophore ...
Chloe L. Smith +4 more
wiley +1 more source
International Journal for Numerical and Analytical Methods in Geomechanics, EarlyView.ABSTRACT In this paper, the dependencies of granular soil behaviour on particle crushing and fabric anisotropy are formulated within a novel model based on bounding surface plasticity theory enriched by the non‐stationary critical state line (NCSL) concept.
Hesam Dejaloud +2 more
wiley +1 more source
Analytical Approach to Describe Properties in Transition Zones Between Ballasted and Non-Ballasted Track [PDF]
, 2022 Norway has for a long time used railways as a means of transport. This method of transportation been used to haul raw materials such as wood and ore.
Ågotnes, Joachim Jørgensen
core
Shock and Vibration, 2021 To study the mechanical characteristics of ballasted bed under dynamic stability, a three-dimensional discrete element model of ballasted bed with 1000 mm × 700 mm × 550 mm is established based on the discrete element method. Meanwhile, a simulation test
Lihua Wang +5 more
doaj +1 more source
River Research and Applications, EarlyView.ABSTRACT In France, it is estimated that shads (Alosa spp.) have lost 69% of their historical range, mainly due to disrupted river connectivity. After an absence of one century, signs of their return in the Seine River have been recorded over the past two decades: adult and juvenile specimens have been caught by anglers or recorded at video‐counting ...
Céline Le Pichon +5 more
wiley +1 more source
Track Modulus Assessment of Engineered Interspersed Concrete Sleepers in Ballasted Track
Applied Sciences, 2020 Ballasted railway track is typically constructed using sleepers that are manufactured from a common material type within a given length of track. Timber and concrete are the two most common sleeper materials used internationally. Evidence from historical
Arthur de Oliveira Lima +3 more
doaj +1 more source
Multi‐level fatigue reliability assessment of reinforced concrete railway bridges
Structural Concrete, EarlyView.Abstract This paper presents a multi‐level reliability framework for assessing the fatigue life of reinforced concrete (RC) railway trough bridges subjected to cyclic loading. The framework incorporates increasing levels of analytical complexity and real‐world data in four steps. First, an analytical model applies S–N curves and the Palmgren–Miner rule
Silvia Sarmiento +7 more
wiley +1 more source
Applied Sciences, 2021 This study investigates a load-based, track-irregularity-analysis technique for ballasted tracks on a serviced railway line with respect to excavation work conducted in adjacent sites.
Jung-Youl Choi +3 more
doaj +1 more source
The influence of structural response on ballast performance on a high speed railway
, 2014 Track for modern ballasted high speed railway lines typically uses continuous welded rail with continuous ballast. Continuous ballast is often specified over features involving discontinuity of track support including structural movement or expansion ...
Powrie, W. +6 more
core +1 more source
Moving element analysis of high-speed rail system accounting for hanging sleepers
MATEC Web of Conferences, 2018 It is very common in the ballasted track system that sleepers are not well supported by the ballast materials due to the uneven settlement of the ballast under repeated train passage.
Dai Jian, Keng Ang Kok, Jiang Dongqi
doaj +1 more source