Results 11 to 20 of about 727,203 (295)
The 21cm angular-power spectrum from the dark ages [PDF]
, 2007 At redshifts z >~ 30 neutral hydrogen gas absorbs CMB radiation at the 21cm spin-flip frequency. In principle this is observable and a high-precision probe of cosmology.
Anthony Challinor +6 more
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Heliyon, 2020 Aims: Non-invasively assessed skin autofluorescence (SAF) measures advanced glycation endproducts (AGEs) in the dermis. SAF correlates with dermal AGEs in Caucasians and Asians, but studies in dark-skinned subjects are lacking.
Isabella M. Atzeni +8 more
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The Planetary Science Journal, 2023 The stratigraphy of the largest natural satellite of our solar system, Ganymede, is investigated using available global mosaic (basemap) and high-resolution images. We are focusing on the reconstruction of the formation and tectonic evolution of selected
Namitha Rose Baby +3 more
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Les sites de hauteur en Crète pendant les siècles obscurs
Projets de Paysage, 2010 At the end of the Bronze Age in Crete, a particular phenomenon makes its appearance. In effect, with the disappearing of centralized power and big palaces, the population scatters and leaves sites in lowland or along the coast to the advantage of site in
Nathalie Monio
doaj +1 more source
Frontiers in Astronomy and Space Sciences, 2017 The reionization of helium at z ~ 3 is the final phase transition of the intergalactic medium and supposed to be driven purely by quasars. The He ii transverse proximity effect—enhanced He ii transmission in a background sightline caused by the ionizing ...
Tobias M. Schmidt +8 more
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Stellar Archeology: What White Dwarf Stars Tell Us About the History of the Galaxy [PDF]
Journal of Astronomy and Space Sciences, 2012 White dwarf stars have played important roles in rather diverse areas of astrophysics. This paper outlines how these stellar remnants, especially those in widely separated “fragile” binaries, have provided unique leverage on difficult astrophysical ...
Terry D. Oswalt
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Measuring the Primordial Deuterium Abundance During the Cosmic Dark Ages [PDF]
, 2005 We discuss how measurements of fluctuations in the absorption of cosmic microwave background (CMB) photons by neutral gas during the cosmic dark ages, at redshifts z ~ 7--200, could reveal the primordial deuterium abundance of the Universe.
A. Dalgarno +9 more
core +2 more sources
Constraints on the equation of state of dark energy and the Hubble constant from stellar ages and the CMB [PDF]
, 2003 We place tight constraints on the redshift-averaged, effective value of the equation of state of dark energy, w, using only the absolute ages of Galactic stars and the observed position of the first peak in the angular power spectrum of the CMB.
Bower R. G. +6 more
core +2 more sources
Frontiers in Psychology, 2022 During the COVID-19 pandemic, the use of online learning has become a necessary choice for students, and would increase the probability of cyber aggression (CA).
Zhen Zhang +3 more
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Astronomy & AstrophysicsAims. The escape fraction of Lyman continuum photons (fesc(LyC)) is the last key unknown in our understanding of cosmic reionization. Directly estimating the escape fraction (fesc) of ionizing photons in the epoch of reionization (EoR) is impossible, due
Giovinazzo Emma +17 more
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