Results 11 to 20 of about 32,962 (258)

New insights into the dust formation of oxygen-rich AGB stars [PDF]

, 2013
We observed the AGB stars S Ori, GX Mon and R Cnc with the MIDI instrument at the VLTI. We compared the data to radiative transfer models of the dust shells, where the central stellar intensity profiles were described by dust-free dynamic model atmospheres. We used Al2O3 and warm silicate grains.
Boboltz, D. A., Fossat, E., Karovicova, I., Ohnaka, K., Scholz, M., Wittkowski, M.   +5 more
arxiv   +5 more sources

Mineral Processing by Short Circuits in Protoplanetary Disks [PDF]

The Astrophysical Journal Letters, Volume 767, Issue 1, article id. L2, 6 pp. (2013), 2013
Meteoritic chondrules were formed in the early solar system by brief heating of silicate dust to melting temperatures. Some highly refractory grains (Type B calcium-aluminum-rich inclusions, CAIs) also show signs of transient heating. A similar process may occur in other protoplanetary disks, as evidenced by observations of spectra characteristic of ...
D'Alessio, Paola, Ebel, Denton S., Hubbard, Alexander, Mac Low, Mordecai-Mark, McNally, Colin P.   +4 more
arxiv   +3 more sources

THE ALUMINA-SILICATES IN STABILIZATION PROCESSES IN FLUIDIZED-BED ASH [PDF]

Ceramics-Silikáty, 2011
Presented study of coal fluidized-bed ash solidification was accompanied with specific studies of alumino-silicates residues in ashes. The specific technology of fluid coal burning and its relatively low temperature combustion combines coal burning and ...
IVANA PERNA, TOMAS HANZLICEK
doaj   +2 more sources

Aluminum incorporation into magnesium silicate hydrate (M-S-H) [PDF]

Cement and Concrete Research, 2020
Abstract The incorporation of aluminum in magnesium silicate hydrate (M-S-H) phases was investigated. Magnesium (alumino) silicate hydrate (M-(A-)S-H) with Mg/Si ratios equal to 1.1 or 1.7 and Al/Si ranging from 0 to 0.2 were synthetized in batch experiments and equilibrated at 20, 50 and 70 °C. pH values between 9 and 10.5 were observed and aluminum
Barbara Lothenbach, Céline Cau-dit-Coumes, Daniel Rentsch, Isabelle Pochard, Ellina Bernard, Ellina Bernard   +5 more
openaire   +4 more sources

Speciation of selected trace and major elements in lignite used in "Nikola Tesla A" power plant (Obrenovac, Serbia) [PDF]

Journal of the Serbian Chemical Society, 2005
Four samples of milled lignite used in the "Nikola Tesla A" power plant located in Obrenovac near Belgrade, were subjected to a five-step sequential extraction, comprising of the following phases: distilled water, 1M ammonium acetate, 0.2M ammonium ...
Popović Aleksandar R., Đorđević Dragana S.   +1 more
doaj   +3 more sources

Combined evaluation of oscillatory rheometry and isothermal calorimetry for the monitoring of hardening stage of Portland cement compositions blended with bauxite residue from Bayer process generated in different sites in Brazil

Revista IBRACON de Estruturas e Materiais, 2021
Bauxite residue (BR), a by-product of alumina and aluminum production, consists of high aluminum, silica, and iron content, and sodium from the bauxite ore digestion during the Bayer process.
Roberto Cesar de Oliveira Romano, José Augusto Ferreira Sales de Mesquita, Heitor Montefusco Bernardo, Danilo Aguiar Niza, Marcel Hark Maciel, Maria Alba Cincotto, Rafael Guiliano Pileggi   +6 more
doaj   +1 more source

Synthesis of 2,8,14,20-tetra-n-butylpyrogallol[4]arene and computational study conformational

ACI Avances en Ciencias e Ingenierías, 2010
This work presents the preparation of mesoporous aluminum silicates from condensation of xerogel obtained from Tetraethyl orthosilicate (TEOS) and other aluminum precursos from various sources.
Cesar H. Zambrano, Carlos A. Manzano, Andrea S. Saltos, Eric E. Dueno, Matthew Zeller   +4 more
doaj   +1 more source

Dusty wind of W Hya. Multi-wavelength modelling of the present-day and recent mass-loss [PDF]

, 2015
Low- and intermediate-mass stars go through a period of intense mass-loss at the end of their lives in a phase known as the asymptotic giant branch (AGB). During the AGB a significant fraction of their initial mass is expelled in a stellar wind.
Cox, N. L. J., de Koter, A., de Vries, B. L., Decin, L., Khouri, T., Lombaert, R., Min, M., Waters, L. B. F. M.   +7 more
core   +3 more sources

Mesoporous aluminosilicates obtained using Triton X. - Synthesis, textural characterization and training scheme on different sizes micelles -

ACI Avances en Ciencias e Ingenierías, 2010
This work presents the preparation of mesoporous aluminum silicates from condensation of xerogel obtained from Tetraethyl orthosilicate (TEOS) and other aluminum precursos from various sources.
Alexis Hidrobo, Jaime Retuert, Paulo Araya   +2 more
doaj   +1 more source

Zeolite-based photocatalysts immobilized on aluminum support by plasma electrolytic oxidation [PDF]

, 2022
The preparation and properties of zeolite-containing oxide coatings obtained by plasma electrolytic oxidation are investigated and discussed. Pure and Ce-exchanged natural (clinoptilolite) and synthetic (13X) zeolites are immobilized on aluminum support from silicate-based electrolyte.
arxiv   +1 more source