Results 71 to 80 of about 10,691 (260)
The stellar origins of 96Zr excesses in presolar graphites from the Murchison meteorite
Astronomy & AstrophysicsContext. Zirconium-96 is a stable isotope that can be synthesized under different neutron-rich nucleosynthetic conditions. Astrophysical models predict its production to occur in various stellar environments: from low-to-intermediate-mass asymptotic ...
Pal I. +16 more
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Burst of the 1969 Leonids and 1982 Lyrids [PDF]
Radar observations of the last bursts of the Leonids in 1969 and Lyrids in 1982, carried out at the Springhill Meteor Observatory, Canada, both of very short duration, with the rates exceeding a quarter-maximum rate within 50-55 minutes, are used for a ...
Porubcan, V., Stohl, Jan
core +1 more source
International Astronomical Union Colloquium, 1976 The composition and density of meteoroids has been the subject of a number of investigations in recent years. Analysis of photographic meteor data have been presented by Jacchia et al (1967). Verniani (1964, 1967, 1969), Benyuch (1968, 1973, 1974), McCrosky and Ceplecha (1969) and others.
openaire +1 more source
Investigating relationships among strontium, barium, and seasonality in wild baboons
Archaeometry, EarlyView.Abstract Geochemical profiles of Australopithecus africanus and baboon teeth show fluctuating trace elements, possibly reflecting seasonal diets. Here we use laser ablation–inductively coupled plasma–mass spectrometric measurements of calcium‐normalized strontium and barium ratios (Sr/Ca and Ba/Ca) and ion microprobe analyses of oxygen isotopes (δ18O ...
Maya Bharatiya +12 more
wiley +1 more source
Solar System material reaching neighboring star systems
Astronomy & AstrophysicsContext. In our Solar System, few macroscopic objects have been observed to be moving in hyperbolic orbits and, thus, they must have originated from interstellar space. Some meteoroids are also suspected to have an interstellar origin.
Neslušan L. +3 more
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A comparison of theoretical calculations with the results of radar meteor observations shows that the theory of radio meteors satisfactorily represents observational data.
Lebedinets, V. N.
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Large meteoroids belonging to the α-Capricornid meteoroid stream
, 2012 Several objects have been proposed as the parent body of the α-Capricornid meteoroidstream. Among them we can find the short period comets 141P/Machholz and 45P/Honda-Mrkos- Pajdusakova, but also asteroids such as (2101) Adonis, 2002 EX12(=169P/NEAT) and (9162) 1987 OA [1-5]. The debris produced by the fragmentation of the
Zamorano, J. +6 more
openaire +2 more sources
Provider Perceptions of Perinatal Mental Healthcare Access
Birth, EarlyView.Study methodology and conclusions: Primary barriers to care and action items for providers. ABSTRACT Background The consequences of untreated perinatal mental health conditions are well‐established, yet fewer than one in five women experiencing perinatal mental health distress receive treatment. Although recommendations for evidence‐based treatment are
Susanna Sutherland +2 more
wiley +1 more source
Late Holocene moisture variability in Arctic Alaska from chitin δ18O
Boreas, EarlyView.Amplified warming in the Arctic has resulted in reduced sea‐ice extent, which can impact regional climate dynamics. Elucidating past moisture variability in response to changing temperatures and sea‐ice conditions can offer insight into how anthropogenic climate change may impact Arctic areas such as the Alaskan North Slope in the future. We contribute
Briana A. Edgerton, Melissa L. Chipman
wiley +1 more source
INTERSTELLAR METEOROIDS WITH ALMOST HYPERBOLIC ORBITS
Odessa Astronomical Publications, 2017 Opportunities for detecting interstellar meteoroids with implicit hyperbolic orbits are explored. It is indicated that the idea of their interstellar origin is based on the distribution of hyperbolic orbits of meteoric particles according to elongation ...
A. K. Markina, L. Ya. Skoblikova
doaj +1 more source