Results 31 to 40 of about 7,604,095 (315)
Some Terpenes and Related Derivatives Synthesized in Cold Plasma Systems
Molecules, 1997 The synthesis of bicyclo-[2.2.1]-heptane and bicyclo-[7.2.0]-undec-4-ene derivatives under cold plasma conditions are reported. The reaction systems involve gaseous mixtures at an interface with ice surfaces.
Cristofor I. Simionescu +3 more
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Filozofia i NaukaThe article presents the hypothesis of the origin of life. All the basic ideas of the 20th century research program in this area can be found there: the extrapolation of Darwinism into the area of chemical evolution, the influence of solar energy, the ...
Richard Krzymowski
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Chemical evolution of low mass disc galaxies [PDF]
, 1999 We show that the multiphase chemical evolution model reproduces the correlations obtained along the spiral sequence, dwarf galaxies included. However the apparent spatial chemical uniformity observed in some irregular galaxies cannot be reproduced with ...
M. Mollá, Jean-René Roy
openalex +4 more sources
First results from the IllustrisTNG simulations: a tale of two elements - chemical evolution of magnesium and europium [PDF]
, 2017 The distribution of elements in galaxies provides a wealth of information about their production sites and their subsequent mixing into the interstellar medium. Here we investigate the distribution of elements within stars in the IllustrisTNG simulations.
J. Naiman +11 more
semanticscholar +1 more source
Galactic Chemical Evolution of Radioactive Isotopes [PDF]
Astrophysical Journal, 2019 The presence of short-lived (∼Myr) radioactive isotopes in meteoritic inclusions at the time of their formation represents a unique opportunity to study the circumstances that led to the formation of the solar system.
Benoit Côté +6 more
semanticscholar +1 more source
Hypernova Nucleosynthesis and Galactic Chemical Evolution [PDF]
, 2001 We study nucleosynthesis in 'hypernovae', i.e., supernovae with very large explosion energies ($ \gsim 10^{52} $ ergs) for both spherical and aspherical explosions.
AI Macfadyen +32 more
core +2 more sources
Universe, 2022 In this paper, we make use of data collected for open cluster members by high-resolution spectroscopic surveys and programmes (i.e., APOGEE, Gaia-ESO, GALAH, OCCASO, and SPA). These data have been homogenised and then analysed as a whole.
Lorenzo Spina +2 more
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Traits for chemical evolution in solar twins [PDF]
Astronomy & Astrophysics, 2019 The physical processes driving chemical evolution in the Milky Way can be probed using the distribution of abundances in low-mass FGK type stars in space phase at different times.
P. Jofré, Holly Jackson, M. T. Maia
semanticscholar +1 more source
Uncertainties in Galactic Chemical Evolution Models [PDF]
, 2016 We use a simple one-zone galactic chemical evolution model to quantify the uncertainties generated by the input parameters in numerical predictions for a galaxy with properties similar to those of the Milky Way.
Côté, Benoit +6 more
core +2 more sources
Volatile Organic Compounds of Bryophytes from Peninsular Malaysia and Their Roles in Bryophytes
Plants, 2022 Volatile emissions from 22 bryophyte species from Peninsular Malaysia were collected using a dynamic headspace technique and analyzed by gas chromatography–mass spectrometry (GC-MS).
Chin Wen Koid +9 more
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