Results 181 to 190 of about 8,008,633 (316)

Craters produced on Al, Cu and Au by Ar cluster impacts

open access: green, 2001
R. C. Birtcher, Jiro Matsuo, Isao Yamada
openalex   +2 more sources

Year‐round variation in monthly and daily group size estimates of barren‐ground caribou in east‐central Alaska

open access: yesJournal of Zoology, EarlyView.
In a globally unique study, the year‐round group sizes of caribou are documented. Group sizes were small in winter and late summer but peaked during the time of peak insect harassment. Abstract Sociality plays a major role in an array of factors critical to the ecology of many species, including sexual selection, migration, habitat selection, predation
K. Joly
wiley   +1 more source

Petrography of phosphates in CI and CY carbonaceous chondrites

open access: yesMeteoritics &Planetary Science, EarlyView.
Abstract Phosphate minerals are significant carriers of volatiles (e.g., OH) and halogens in chondritic material; however, their origin in most groups of carbonaceous chondrites remains poorly characterized. We have determined the abundance, morphology, texture, and composition of phosphate grains in aqueously altered CI chondrites and in hydrated and ...
C. S. Harrison   +3 more
wiley   +1 more source

Discovery of the largest impact crater field on Earth in the Gilf Kebir region, Egypt [PDF]

open access: green, 2004
Philippe Paillou   +6 more
openalex   +1 more source

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