Results 41 to 50 of about 208,599 (323)
Multiscale understanding of tricalcium silicate hydration reactions
Scientific Reports, 2018 Tricalcium silicate, the main constituent of Portland cement, hydrates to produce crystalline calcium hydroxide and calcium-silicate-hydrates (C-S-H) nanocrystalline gel. This hydration reaction is poorly understood at the nanoscale. The understanding of
A. Cuesta +8 more
semanticscholar +1 more source
Silicion supplementation increases the in vitro regeneration of oil palm (Elaeis guineensis Jacq.) somatic embryos [PDF]
Ciência e AgrotecnologiaThe use of silicates in plant tissue culture has resulted in positive effects regarding the morphological, anatomical and physiological characteristics of in vitro plants. However, biological responses to this mineral are dose and genotype dependent. The
Lavínia Barbosa Oliveira +5 more
doaj +1 more source
Simultaneous spectrophotometric determination of phosphate and silicate by using partial least squares method [PDF]
شیمی کاربردی روز, 2009 A very sensitive, simple and selective spectrophotometric method for simultaneous determination of phosphate and silicate based on formation of phospho- and silicomolybdenum blue complexes in the presence of ascorbic acid is described.
Mehdi Nekoei +2 more
doaj +1 more source
The shape and composition of interstellar silicate grains [PDF]
, 2006 We investigate the composition and shape distribution of silicate dust grains in the interstellar medium. The effect of the amount of magnesium in the silicate lattice is studied. We fit the spectral shape of the interstellar 10 mu extinction feature as observed towards the galactic center.
arxiv +1 more source
Pixie Dust: The Silicate Features in the Diffuse Interstellar Medium [PDF]
Astrophys.J.637:774-785,2006, 2005 We have analyzed the 9.7 and ``18'' micron interstellar silicate absorption features along the line of sight toward four heavily extincted galactic WC-type Wolf-Rayet (WR) stars. We construct two interstellar extinction curves from 1.25 to 25 micron using near-IR extinction measurements from the literature along with the silicate profiles of WR 98a ...
arxiv +1 more source
, 1983 A computer model has been constructed that considers the effects on the CO/sub 2/ level of the atmosphere, and the Ca, Mg, and HCO/sub 3/ levels of the ocean, of the following processes: weathering on the continents of calcite, dolomite, and calcium-and ...
R. Berner, A. Lasaga, R. Garrels
semanticscholar +1 more source
Mechanochemically assisted hydrothermal synthesis of Sn-substituted MFI-type silicates
Science and Technology of Advanced Materials, 2018 Substitution of Al atoms in a zeolite framework by catalytic metal atoms has attracted considerable attention because the catalytic behavior can be tuned by the substituted atoms.
Kiyoshi Kanie +6 more
doaj +1 more source
Silicate absorption in heavily obscured galaxy nuclei [PDF]
Mon.Not.Roy.Astron.Soc.375:99-104,2007, 2006 Spectroscopy at 8-13 microns with T-ReCS on Gemini-S is presented for 3 galaxies with substantial silicate absorption features, NGC 3094, NGC 7172 and NGC 5506. In the galaxies with the deepest absorption bands, the silicate profile towards the nuclei is well represented by the emissivity function derived from the circumstellar emission from the red ...
arxiv +1 more source
Monte Carlo Simulation of Dust Particles in a Protoplanetary Disk: Crystalline to Amorphous Silicate Ratio in Comets [PDF]
, 2022 Observationally inferred crystalline abundance in silicates in comets, which should have been formed in the outer region of a protoplanetary disk, is relatively high (~ 10-60%), although crystalline silicates would be formed by annealing of amorphous precursors in the disk inner region.
arxiv +1 more source