Results 21 to 30 of about 927,917 (298)
Effect of population abundances on the stability of large random ecosystems. [PDF]
Physical Review E, 2017 Random matrix theory successfully connects the structure of interactions of large ecological communities to their ability to respond to perturbations.
Theo L. Gibbs +3 more
semanticscholar +1 more source
On Generalised Abundance, II [PDF]
Peking Mathematical Journal, 2019 The goal of this paper is to make a striking connection between several central conjectures in algebraic geometry: the Nonvanishing Conjecture, the Abundance Conjecture and the Semiampleness Conjecture for nef line bundles on K -trivial varieties.
Vladimir Lazić, Thomas Peternell
openaire +5 more sources
Determining cellular CTCF and cohesin abundances to constrain 3D genome models
eLife, 2019 Achieving a quantitative and predictive understanding of 3D genome architecture remains a major challenge, as it requires quantitative measurements of the key proteins involved.
Claudia Cattoglio +17 more
semanticscholar +1 more source
New Astronomy, 1999 19 pages, 1 figure. To appear in New Astronomy, for the David N.
Jean Audouze +12 more
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Surface abundances of ON stars [PDF]
Astronomy & Astrophysics, 2015 Massive stars burn hydrogen through the CNO cycle during most of their evolution. When mixing is efficient, or when mass transfer in binary systems happens, chemically processed material is observed at the surface of O and B stars. ON stars show stronger lines of nitrogen than morphologically normal counterparts.
Sergio Simón-Díaz +8 more
openaire +5 more sources
ABUNDANCES, STELLAR PARAMETERS, AND SPECTRA FROM THE SDSS-III/APOGEE SURVEY [PDF]
, 2015 The SDSS-III/Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey operated from 2011–2014 using the APOGEE spectrograph, which collects high-resolution (R ∼ 22,500), near-IR (1.51–1.70 μm) spectra with a multiplexing (300 fiber-fed ...
J. Holtzman +42 more
semanticscholar +1 more source
Abundance and abundance change in the world's parrots [PDF]
Ibis, 2015 Estimates of population density and abundance change (differences in density or encounter rates across land uses or time periods) form the cornerstone of much of our knowledge of species' responses to environmental conditions, extinction risks and potential conservation actions. Gathering baseline data on abundance of the world's c. 10 000 bird species
Kay Royle, Stuart J. Marsden
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Interpretation of Abundance Ratios [PDF]
Publications of the Astronomical Society of Australia, 2005 Abstract In this paper we discuss abundance ratios and their relation to stellar nucleosynthesis and other parameters of chemical evolution models, reviewing and clarifying the correct use of the observed abundance ratios in several astrophysical contexts.
MATTEUCCI, MARIA FRANCESCA, CHIAPPINI C.
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COMPLETE ELEMENT ABUNDANCES OF NINE STARS IN THE r-PROCESS GALAXY RETICULUM II [PDF]
, 2016 We present chemical abundances derived from high-resolution Magellan/Magellan Inamori Kyocera Echelle spectra of the nine brightest known red giant members of the ultra-faint dwarf galaxy Reticulum II (Ret II). These stars span the full metallicity range
A. Ji, A. Frebel, J. Simon, A. Chiti
semanticscholar +1 more source
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 +3 more sources