Results 1 to 10 of about 229,806 (251)
Technology and determination of the applicability of stone blowing at the current track maintenance
Вестник Научно-исследовательского института железнодорожного транспорта, 2020 Grain composition of track ballast is in a narrow size range, which provides maximum volume of ballast voids of 30–60 mm for category 1 crushed stone, 25–60 mm for category 2 crushed stone with round sieves and 22.4–63.0 mm for category B crushed stone ...
V. N. Kaplin +2 more
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Timelines of the “free-particle” and “fixed-particle” models of stone-formation: theoretical and experimental investigations [PDF]
Urolithiasis, 2016 Two major theories on renal stone formation will be reviewed, the "free-particle" and "fixed-particle" mechanisms. These theories combine data on intrinsic factors (inborn metabolic errors), extrinsic factors (diet), renal cell responses and the physico-chemistry and biochemistry of urine into mechanisms of stone formation.
Kok, DJ +3 more
openaire +3 more sources
Particle and Fibre Toxicology, 2022 Background Respirable mineral particles represent a potential health hazard in occupational settings and ambient air. Previous studies show that mineral particles may induce cytotoxicity and inflammatory reactions in vitro and in vivo and that the ...
Vegard Sæter Grytting +7 more
doaj +1 more source
Crystals, 2020 Replacing part of cement with waste stone powder can reduce the use of cement, thus reducing energy consumption and CO2 emission. Different stone powders affect the properties of cement-based materials differently.
Xiaowei Ouyang +3 more
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Analitic Investigation of the Regularities of Changing Dust Concentration During the Abrasive Decrease of Stone Structures [PDF]
, 2018 In the process of repair or restoration of building structures, it is often necessary to strengthen building structures from limestone-shell rock, concrete, reinforced concrete, hard materials-granite, basalt, etc.
Bezpalova, A. (Alla) +2 more
core +2 more sources
Variable fractionation of solar energetic particles according to first ionization potential [PDF]
, 2000 The average composition of solar energetic particles (SEPs), like the solar corona, is known to be depleted in elements with first ionization potential (FIP) more than ~10 eV by a factor of approximately four.
Christian, E. R. +8 more
core +1 more source
An alternative origin for nanobacteria in kidney stones [PDF]
, 2008 Small (50e200 nm), calcium phosphate (apatite)-covered organic particles called nanobacteria or calcifying nanoparticles (CNP) seem to be ubiquitous in kidney stones and are thought to be involved in stone formation.
Aloisi, Giovanni
core +2 more sources
True grit: ingestion of small stone particles by hummingbirds in West Mexico [PDF]
Avian Research, 2021 AbstractBackgroundGrit is used by birds mainly for grinding hard food items but can also serve a nutritional role as a source of minerals. Ingestion of grit by birds has been documented primarily in species that feed on seeds and invertebrates. Although feeding mainly on nectar and small arthropods, hummingbirds also ingest grit, but why they do so is ...
Omar Maya-García +2 more
openaire +1 more source
Particle and Fibre Toxicology, 2022 Background People are exposed to ambient particulate matter (PM) from multiple sources simultaneously in both environmental and occupational settings.
Vegard Sæter Grytting +4 more
doaj +1 more source
Investigation of the Formation Process of Hazardous and Harmful Production Factors When Cutting a Stone for Construction Works [PDF]
, 2017 Stone cutting for construction work is carried out by disk diamond wheels the rotation speed of which, and, consequently, the cutting speed is 35-50 m/s.
Bezpalova, A. (Alla) +1 more
core +2 more sources