Results 91 to 100 of about 129,371 (270)
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
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
Veterinary Record, EarlyView.Abstract Background Gastrolith ingestion is a known inherent behaviour in crocodiles. However, the interpretation of coelomic radiographs in crocodilians is challenging due to the limited informative literature in this field. Methods Dorsoventral coelomic radiographs of 49 juvenile saltwater crocodiles (Crocodylus porosus) were acquired twice, with an ...
Charlotte R. Nix +4 more
wiley +1 more source
Natural Resources Forum, EarlyView.ABSTRACT The 2030 Agenda for Sustainable Development aims to eradicate poverty, protect the environment, and promote prosperity through 17 Sustainable Development Goals (SDGs). Achieving these goals requires a multi‐sectoral approach. Maritime transportation, vital to the global economy, significantly contributes to several SDGs and plays a strategic ...
Cátia Sousa +3 more
wiley +1 more source
Rail Track Maintenance Planning: An Assessment Model [PDF]
, 2000 In Australia, railway track maintenance costs comprise between 25-35 percent of total freight train operating costs. Track maintenance planning models have been shown to reduce maintenance costs by 5 to 10 percent though improved planning.
Ferreira, Luis +2 more
core +2 more sources
Methods in Ecology and Evolution, EarlyView.Abstract Optimal allocation of resources to the management of biosecurity risk, threatened species conservation or natural hazards such as bushfires is imperative—because program budgets are usually finite and, therefore, constrained. However, effectively dividing resources among management activities to achieve the greatest benefit remains a ...
Aaron Dodd, Edith Arndt, Anca Hanea
wiley +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
Preview of Ballast Water Treatment System Market Status
Naše More (Dubrovnik), 2017 The International Convention for the Control and Management of Ships’ Ballast Water and Sediments was adopted in February 2004 and it was ratified by a sufficient number of countries in September 2016.
Nermin Hasanspahić, Damir Zec
doaj +1 more source
Modelling of elastoviscoplastic properties of the subgrade. Problem statement 1
Вестник Научно-исследовательского института железнодорожного транспорта, 2016 A brief analysis of the physical and mechanical properties of materials, used in the construction of the rail bed, has shown that in scientific and technical literature there is scattered unsystematic information obtained under different physical ...
V. M. Bel’Kov
doaj +1 more source
Ultra-heavy vertical lift system: The Heli-Stat [PDF]
, 1975 A hybrid VTOL airship which is combined with helicopters is evaluated. The static lift of the airship supports approximately the full empty weight of the entire assembly.
Piasecki, F. N.
core +1 more source