Results 141 to 150 of about 129,371 (270)

Impact of wheel shape on the vertical damage of cast crossing panels in turnouts [PDF]

open access: yes, 2015
Impact forces generated in the load transfer area of railway crossing panels lead to a range of degradation modes from wear and fatigue of the contacting materials, fatigue of supporting components to ballast/subgrade deterioration.
Bezin, Yann   +3 more
core  

LCA analysis of a roof mounted PV system: a Romanian case study

open access: yesFrontiers in Environmental Science
Using solar photovoltaic power sources has become a discussed topic in the construction and energy industry. The pressing need to reduce reliance on fossil fuels, increasing costs of traditional electricity generation, and affording photovoltaic modules ...
Tania Rus   +2 more
doaj   +1 more source

Geochemical analysis of Cenozoic fossil conifers at high latitudes: Implications for molecular preservation and environmental change [PDF]

open access: yes, 2010
Fossil materials record ancient life and their adapted environment. Arctic plant fossils are critical for our understanding of the Earth’s paleoenvironment when high latitudes were under ice-free conditions.
Witkowski, Caitlyn
core   +1 more source

Wind velocity probing device and method Patent [PDF]

open access: yes, 1970
Free-fall body for obtaining wind velocity profiles by radar ...
Stengel, R. F.
core   +1 more source

A comparative study of new ballast and recycled ballast generated from various maintenance activities

open access: yesTransportation Engineering
Railroad ballast performance is influenced by aggregate type, geological origin and mineralogy, gradation, and particle shape. As ballast ages, it gets progressively fouled with finer materials generated from particle breakage and abrasion, which may ...
Erol Tutumluer   +8 more
doaj   +1 more source

Association of Sex-Related Differences in Body Composition to Change of Direction Speed in Police Officers While Carrying Load [PDF]

open access: yes, 2020
Cvorovic, Aleksandar   +7 more
core   +1 more source

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