Results 11 to 20 of about 381,696 (284)
Gas-phase Condensation of Carbonated Silicate Grains
The Astrophysical JournalReports on the detection of carbonates in planetary nebulae (PNe) and protostars have suggested the existence of a mechanism that produces these compounds in stellar winds and outflows.
Gaël Rouillé +3 more
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The shape and composition of interstellar silicate grains [PDF]
Astronomy & Astrophysics, 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.
Kemper, Ciska +6 more
openaire +8 more sources
Astronomy & AstrophysicsContext. Observations have revealed the presence of silicate and carbonaceous material in interstellar grains, however, these components are generally assumed to belong to distinct dust populations.
Kyriazis Alexandros +2 more
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Interstellar Silicate Dust: Modeling and Grain Alignment [PDF]
, 2013 We examine some aspects of the alignment of silicate dust grains with respect to the interstellar magnetic field. First, we consider possible observational constraints on the magnetic properties of the grains. Second, we investigate the role of collisions with gas atoms and the production of H2 molecules on the grain surface in the alignment process ...
Das, Indrajit
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Energetic Processing of Interstellar Silicate Grains by Cosmic Rays [PDF]
The Astrophysical Journal, 2007 While a significant fraction of silicate dust in stellar winds has a crystalline structure, in the interstellar medium nearly all of it is amorphous. One possible explanation for this observation is the amorphization of crystalline silicates by relatively ‘‘low’’ energy, heavy-ion cosmic rays.
Bringa, E M +12 more
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Is the silicate emission feature only influenced by grain size? [PDF]
Astronomy & Astrophysics, 2008 accepted by Astronomy & Astrophysics Letters; small revision after referee ...
Voshchinnikov, N. V., Henning, Th.
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Comment on “The shape and composition of interstellar silicate grains” [PDF]
Astronomy & Astrophysics, 2008 4 pages; Accepted for publication April 4, 2008 by Astronomy & Astrophysics; added missing subscript in table ...
Bradley, J P, Ishii, H
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ÆSOPUS 2.0: Low-temperature Opacities with Solid Grains
The Astrophysical Journal, 2023 In this study we compute the equation of state and Rosseland mean opacity from temperatures of T ≃ 30,000 K down to T ≃ 400 K, pushing the capabilities of the Æ SOPUS code into the regime where solid grains can form.
Paola Marigo +5 more
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Productivity and Quality of Rice as Influenced by Foliar Spray of Different Silicon Sources and Rates Under Salinity Soil Conditions [PDF]
Journal of Plant Production, 2020 A field experiment was carried out at El-Sirw Agriculture Research Farm at Damietta governorate, Egypt in 2018 and 2019 seasons. This investigation aimed to be study the effect of foliar application of three silicon sources at three rates for each, i.e ...
O. Ali, M. Abdel-Aal, S. M. Bassiouni
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Effect of Irrigation Intervals and Silicon Sources on the Productivity of Broadcast-Seeded Sakha 107 Rice Cultivar [PDF]
Journal of Plant Production, 2018 This investigation was carried out during the two summer seasons of 2016 and 2017 at Rice Research Department, Experimental Farm, Sakh, Kafrelsheikh Governorate, Egypt.
E. Gewaily, M. Awad-Allah, B. Mikhael
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