Results 91 to 100 of about 289,818 (249)
, 1980 La theorie presentee permet d'obtenir une formulation explicite de l'influence des rugosites ainsi que des variations locales de constante dielectrique n2 (dues par exemple a une modification de composition ou de compacite) sur la reflexion rasante d'un ...
L. Névot, P. Croce
semanticscholar +1 more source
AGB and SAGB stars: modelling dust production at solar metallicity [PDF]
, 2017 We present dust yields for asymptotic giant branch (AGB) and super--asymptotic giant branch (SAGB) stars of solar metallicity. Stars with initial mass $1.5~M_{\odot} \leq M_{\rm ini} \leq 3~M_{\odot}$ reach the carbon star stage during the AGB phase and ...
Dell'Agli, F. +7 more
core +3 more sources
Espumado de mezclas de silicato de sodio-wollastonita por microondas
Boletín de la Sociedad Española de Cerámica y Vidrio, 2004 The effect of the application of microwaves on the volume, porosity and thermal conductivity of sodium silicate-wollastonite mixtures was studied. The compositional range studied was 20-100 wt% sodium silicate.
Vargas, G. +5 more
doaj
Revista Brasileira de Ciência do Solo, 2006 A acidez do solo é um dos principais fatores limitantes na produção agrícola. O calcário é o corretivo mais utilizado, porém tem lenta mobilidade no perfil do solo, sendo lenta a correção além da camada de incorporação. Por isso, outros produtos têm sido
Lucélia Alves Ramos +4 more
doaj +1 more source
Solutions of Silicates of the Alkalies [PDF]
The Journal of Physical Chemistry, 1898 n ...
Kahlenberg, L., Lincoln, A. T.
openaire +2 more sources
The Origin of the Silicate Emission Features in the Seyfert 2 Galaxy, NGC 2110 [PDF]
, 2009 The unified model of active galactic nuclei (AGN) predicts silicate emission features at 10 and 18 microns in type 1 AGN, and such features have now been observed in objects ranging from distant QSOs to nearby LINERs. More surprising, however, is the detection of silicate emission in a few type 2 AGN.
arxiv +1 more source
The effect of aqueous alteration and metamorphism in the survival of presolar silicate grains in chondrites [PDF]
, 2008 Relatively small amounts (typically between 2-200 parts per million) of presolar grains have been preserved in the matrices of chondritic meteorites.
Bischoff +31 more
core +1 more source
THE FRACTIONAL ANALYSIS OF SILICATES. [PDF]
Journal of the American Chemical Society, 1891 n ...
openaire +3 more sources
A closer look into close packing: pentacoordinated silicon in a high-pressure polymorph of danburite
IUCrJ, 2017 Due to their high technological and geological relevance, silicates are one of the most studied classes of inorganic compounds. Under ambient conditions, the silicon in silicates is almost exclusively coordinated by four oxygen atoms, while high-pressure
Anna Pakhomova +9 more
doaj +1 more source
Optical properties of non-stoichiometric amorphous silicates with application to circumstellar dust extinction [PDF]
, 2017 Optical constants of non-stoichiometric amorphous magnesium-iron silicates are determined. It is demonstrated that these can well reproduce the observed mid-infrared emission spectra of evolved stars. Stoichiometric and non-stoichiometric amorphous magnesium-iron silicate films are fabricated by pulsed laser deposition.
arxiv +1 more source