Results 91 to 100 of about 381,696 (284)
Chemical Engineering Transactions, 2017 Silicification is one of the chemical methods of loess treatment. The mechanism of loess reinforced by electricity modified sodium silicate is studied for better silicification effect. Using unconfined compressive strength test, X-ray diffraction and SEM
Sheng Fang +4 more
doaj +1 more source
Grain-boundary enrichment of iron on magnesium silicate perovskite
European Journal of Mineralogy, 2007 We present a combined experimental and numerical simulations study of grain boundaries in (Fe, Mg)SiO3 perovskite. TEM observations of grain boundaries in a well equilibrated perovskite sample consistently show small but significant enrichments of Fe. This result is in good agreement with classical potentials simulations of grain boundary structures in
David P. Dobson +3 more
openaire +1 more source
Interstellar extinction by composite grains
, 2001 Recent studies indicate that interstellar grains are composites of very small individual particles of silicates and carbon glued together into an aggregate.
J. S. Dobbie +3 more
core +1 more source
Journal of Quaternary Science, EarlyView.ABSTRACT Volcanic ash (tephra) provides an important chronostratigraphic framework for correlating Quaternary records. In ultra‐distal ( > $\gt $1500 km) settings such as ice cores and marine sediments, deposits are typically preserved as cryptotephra composed of glass shards ≤ 20 μ $\le 20\,\mu
Celeste Smith +6 more
wiley +1 more source
Silicate dust in a Vega-excess system [PDF]
, 1992 The 10-µm spectrum of the K5V star SAO 179815 ( = HD 98800) is presented, and conclusively demonstrates the presence of small silicate dust grains (probably in a disc) around this star.
BARLOW, MJ, JUSTTANONT, K, SKINNER, CJ
core +1 more source
The Mg isotope composition of presolar silicate grains from red giant stars
, 2014 We report O and Mg isotope compositions of presolar silicate grains which likely formed around asymptotic giant branch stars. Our grains represent the most abundant Mg-rich presolar grain group and their Mg isotope composition provides thus far missing ...
Kodolányi, J. +4 more
core +1 more source
Journal of Quaternary Science, EarlyView.ABSTRACT Glacial/interglacial climate cycles since marine isotope stage (MIS) 12 influenced the discontinuous and 73 m‐long sediment record from the volcanic crater of Rodderberg in the East Eifel Volcanic Field, Germany. High‐resolution grain size and geochemical data have been valued by numerical dating techniques (radiocarbon and luminescence dating,
Bernd Zolitschka +4 more
wiley +1 more source
The Astronomical JournalWe present the initial results of the Measuring Extinction and Abundances of Dust project, with a focus on the dust extinction features observed in our JWST near- and mid-infrared spectra of nine diffuse Milky Way sightlines (1.2 ≤ A ( V ) ≤ 2.5).
Marjorie Decleir +5 more
doaj +1 more source
Journal of the Science of Food and Agriculture, EarlyView.Abstract BACKGROUND Silicon (Si) has been demonstrated to be an important element to enhance crop tolerance against salinity. Nevertheless, mechanisms underlying Si's mitigation of salt stress remains insufficiently explored and understood. This study aims to provide new insights into Si's impact on salt‐stressed Sorghum bicolor (L.) supplied or not ...
Farah Bounaouara +12 more
wiley +1 more source
Marcasite at the Permian‐Triassic Transition
Geophysical Monograph Series, Page 377-399., 2021 Exploring the links between Large Igneous Provinces and dramatic environmental impact
An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Elena Lounejeva +7 more
wiley +3 more sources