Results 221 to 230 of about 229,806 (251)

Biological nanosilver particles for the protection of archaeological stones against microbial colonization

International Biodeterioration & Biodegradation, 2014
The inhabitation of microorganisms and their subsequent interaction with mineral matrix of the stone substrate under varied environmental conditions encourages deterioration of stones leading to the loss of strength, durability and aesthetic. This study highlighted the synthesis of nanosilver particles (AgNPs) using the biogenic volatiles of the ...
Ashraf M.M. Essa, Mohamed K. Khallaf
openaire   +1 more source

Discrete element modeling of the single-particle crushing test for ballast stones

Computers and Geotechnics, 2017
Abstract In this paper, a discrete element modeling approach for the single-particle crushing test for irregularly shaped ballast stones is presented. Bonded spherical particles are used to represent test specimens. Parametric studies focusing on particle size, axial strain rate, particle aggregate size and number of bonds are performed.
Bo Wang, Ullrich Martin, Sebastian Rapp
openaire   +1 more source

Importance of particle shape on stress-strain behaviour of crushed stone-sand mixtures

Geomechanics and Engineering, 2016
In ballasted railway tracks, ballast fouling due to finer material intrusion has been identified as a challenging issue in track maintenance works. In this research, deformation characteristics of crushed stone-sand mixtures, simulating fresh and fouled ballasts were studied from laboratory and a 3-D discrete element method (DEM) triaxial compression ...
Janaka J. Kumara, Kimitoshi Hayano
openaire   +1 more source

The expectation of free and fixed particles in urinary stone disease.

Investigative urology, 1978
There is a paucity of literature concerning the origin of urinary stone disease. This report uses information currently available to examine the likelihood of urinary stone disease starting from free or fixed crystalluric particles. We conclude that stone disease in the renal tubules and renal pelvis cannot begin on unattached (free) particles. However,
B, Finlayson, F, Reid
openaire   +1 more source

Comparative erosion rates of stone and iron meteorites under small-particle bombardment

Geochimica et Cosmochimica Acta, 1967
Abstract Various brittle and ductile materials were subjected to bombardment by small particles and the mechanisms and relative rates of mass loss were compared. Among the samples studied were the meteorites Indarch and Hoba, a chondrite and an iron, respectively.
openaire   +1 more source

Particle Sorting and Stone Migration by Freezing and Thawing

Science, 1965
D R, Inglis, A E, Corte
openaire   +2 more sources

Moulded articles of resin-bonded stone particles

Composites, 1991
openaire   +1 more source

Temporal and spatial significance of volcanic particles in sand(stone): implications for provenance and palaeotectonic reconstructions

Geological Society Special Publication, 2023
Salvatore Critelli, Sara Criniti, William Cavazza   +2 more
exaly  

Risk assessment of microplastic particles

Nature Reviews Materials, 2022
Albert A Koelmans, Paula Redondo Hasselerharm, Nur Hazimah Mohamed Nor   +2 more
exaly  

2.4 Particle Concentration: Stone Pavements

1973
openaire   +1 more source