Results 61 to 70 of about 99,906 (242)
Communications, 2020 This article deals with replacement of the magnetic grippers on the VPO-3-3000 machines with roller grippers. The novelty lies in establishment of dependences characterizing stress and strain in elements of the lifting and straightening devices and in ...
Adil Kadyrov +3 more
doaj +1 more source
An integrated approach to balance freshwater connectivity restoration and invasion risk
Conservation Biology, EarlyView.Abstract Habitat fragmentation negatively affects many native migratory fish populations. However, this fragmentation can also prevent the spread and establishment of invasive species. We modified the dendritic connectivity index (DCI), a commonly used freshwater connectivity metric, to account for multiple invasive dispersal pathways in estimates of ...
Alex Arkilanian +3 more
wiley +1 more source
Dynamic effect of high speed railway traffic loads on the ballast track settlement [PDF]
, 2011 The traditional ballast track structures are still being used in high speed railways lines with success, however technical problems or performance features have led to non-ballast track solution in some cases.
Gabaldón Castillo, Felipe +2 more
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Fast computation: a steady-state simulation of railways ballasted track settlement [PDF]
, 2017 Geometryofballastedrailwaystrackisamajorconcerninrailroadssafetyand efficiency. Settlement of railways ballast has been studied to help railway infrastructure managers to keep infrastructures in shape and to prevent accidents.
Badinier, Thibault +2 more
core
Journal of Traffic and Transportation Engineering (English ed. Online)Railway ballast is easily contaminated by different fouling material and the fouled ballast always causes the deterioration of railway track. Many previous studies focused on the effect of a certain kind of fouling material on ballast performance, but ...
Xu Zhang +4 more
doaj +1 more source
Applied Rheology, 2015 An elasto-visco-plastic model of the Cauchy stress is proposed for gluing solution of railway ballast, with an asymptotic timedependent viscosity accounting for the anti-thixotropic and shear-thickening features.
Fang Chung +4 more
doaj +1 more source
Experimental study on influences of scale effect on mechanical properties of railway ballast
Yantu gongcheng xuebao, 2018 For the purpose of studying the effects of particle size distribution (PSD) and scale effect on strength and deformation characteristics of the ballast, a series of triaxial shear tests based on 1/4 scaled ballast as well as full ballast are carried out ...
YAO Xin-kai , BIAN Jiang , WANG Xu-dong
doaj +1 more source
Entomologia Experimentalis et Applicata, EarlyView.We assessed Spodoptera litura (Lepidoptera: Noctuidae) performance on five common pasture plant species. Larvae consumed more dock, plantain and chicory per day than red or white clover, but with lower conversion efficiencies. Feeding on red clover reduced weights and egg laying, and lengthened development times compared with plantain.
J. G. Jensen +4 more
wiley +1 more source
Stable, inflatable life raft for high seas rescue operations [PDF]
, 1971 Raft is easily deployed and highly maneuverable in water. It has false bottom of water ballast containers attached to underside, making it exceptionally stable platform from which swimmers can operate.
Barnett, J. H., Jr. +3 more
core +1 more source
Fracture toughness estimation of ballast stone used in Iranian railway
Journal of Rock Mechanics and Geotechnical Engineering, 2017 Ballast is a layer composed of crushed stone basically with diameters of 20–60 mm, on which sleepers and rails are set. Ballast is used to withstand vertical, horizontal and lateral forces applied on sleepers and to hold the line in operative conditions.
I. Ferestade +2 more
doaj +1 more source