Results 21 to 30 of about 606,356 (317)
, 2023 The objective world subsists, functions, and plays its follies according to the temporal dominion and phenomenal laws over which man has no control – just as he has no control over laws of gravitation (Nevatia and Nevatia 2021). The generally accepted notion is that the economy operates under conditions of scarcity, whereby resources that are limited ...
Omazić, Mislav Ante +2 more
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Chemical sensitivity to the ratio of the cosmic-ray ionization rates of He and H2 in dense clouds [PDF]
, 2006 Aim: To determine whether or not gas-phase chemical models with homogeneous and time-independent physical conditions explain the many observed molecular abundances in astrophysical sources, it is crucial to estimate the uncertainties in the calculated ...
Baldwin +24 more
core +3 more sources
Cu I resonance lines in turn-off stars of NGC 6752 and NGC 6397. Effects of granulation from CO5BOLD models [PDF]
, 2010 Context. Copper is an element whose interesting evolution with metallicity is not fully understood. Observations of copper abundances rely on a very limited number of lines, the strongest are the Cu I lines of Mult.
Bonifacio, Piercarlo +2 more
core +5 more sources
Frontiers in Research Metrics and Analytics, 2022 With technological advance has come the possibility of a new era of abundance. Technologies like 3D printing and robotics promise to lower the costs of production and distribution of goods and services, presumably making these goods and services readily available to those across income and wealth spectrums. This undoubtedly is a good thing.
openaire +3 more sources
Nucleosynthesis Predictions and High-Precision Deuterium Measurements
Universe, 2017 Two new high-precision measurements of the deuterium abundance from absorbers along the line of sight to the quasar PKS1937–1009 were presented. The absorbers have lower neutral hydrogen column densities (N(HI) ≈ 18 cm − 2 ) than for previous ...
Signe Riemer-Sørensen +1 more
doaj +1 more source
Integral Field Spectroscopy of Planetary Nebulae with MUSE
Galaxies, 2020 The Multi-Unit Spectroscopic Explorer (MUSE) is a large integral field unit mounted on the ESO Very Large Telescope. Its spatial (60 arcsecond field) and wavelength (4800–9300Å) coverage is well suited to detailed imaging spectroscopy of extended ...
Jeremy R. Walsh, Ana Monreal-Ibero
doaj +1 more source
High-Resolution Spectroscopy of Cool Carbon-Rich and Metal-Poor Star HD 209621
Open Astronomy, 2012 Element abundances for HD 209621 obtained earlier display significant discrepancies, especially in the case of CNO and neutron-capture elements. Therefore we performed a detailed analysis of chemical composition of this star using a new high-resolution ...
Matrozis E., Začs L., Barzdis A.
doaj +1 more source
Advances in Oceanography and Limnology, 2010 Over the last two decades, viruses in aquatic systems have been observed to modify, influence and control aquatic systems. Since the determination decades ago that viruses were abundant in aquatic ecosystems, researchers have demonstrated that viruses ...
Stéphan Jacquet +4 more
doaj +1 more source
Chemical Evolution of the Galactic Bulge as Derived from High-Resolution Infrared Spectroscopy of K and M Red Giants [PDF]
, 2006 We present chemical abundances in K and M red-giant members of the Galactic bulge derived from high-resolution infrared spectra obtained with the Phoenix spectrograph on Gemini-South.
Bessel M. S. +10 more
core +3 more sources
Planetary Nebulae: Abundances and Abundance Gradients [PDF]
, 2000 In this work, a review is given of some recent results and problems involved in the determination of chemical abundances of galactic planetary nebulae, particularly regarding disk and bulge objects.
openaire +2 more sources