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Wyszukujesz frazę "Charles, J." wg kryterium: Autor


Tytuł:
A new Oligocene site with terrestrial mammals and a selachian fauna from Minqar Tibaghbagh, the Western Desert of Egypt
Autorzy:
VAN VLIET, HENDRIK JAN
SCHULP, ANNE S.
ABU EL-KHEIR, GEBELY A.M.M.
PAIJMANS, THEO M.
BOSSELAERS, MARK
UNDERWOOD, CHARLES J.
Tematy:
mammalia
palaeomastodontidae
hyracoidea
anthracotheriidae
chondrichthyes
oligocene
egypt
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/945646.pdf  Link otwiera się w nowym oknie
Opis:
A new fossil site at Minqar Tibaghbagh, east of Siwa, in the Egyptian Western Desert is described. This represents the first place in Egypt outside the Fayum Depression yielding Paleogene, terrestrial mammals. Initial studies indicate the presence of palaeomastodonts, hyracoids, and anthracotheres, presumably early Oligocene in age. As only surface prospecting has been performed, more taxa will almost certainly be discovered in future investigations here and probably also elsewhere in the surroundings. A comparison is made with the most important contemporaneous sites in Libya and Egypt that yield terrestrial mammal remains. The selachian fauna from a higher level in the section confirms the Paleogene age of the subjacent strata. It is compared with selachians faunas from the early Oligocene Eastern Tethys Ocean at other places (the Fayum Depression in Egypt, and sites in Oman and Pakistan), and differs from these sites in being fully marine. Contrary to earlier studies, the open marine mudstones of the Daba’a Formation at Minqar Tibaghbagh are overlain by Paleogene marine sediments of most probably early Oligocene age and not early Miocene marine sediments as previously reported. These strata represent not only a new site with great potential for future finds, but also allows for biostratigraphic correlation.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular alloying drives valence change in a van der Waals antiferromagnet
Autorzy:
Perlepe, Panagiota
Viborg, Anton
Christensen, Niels B.
Brechin, Euan K.
Pryds, Nini
Wong, Siena
Clérac, Rodolphe
Trier, Felix
Jinschek, Joerg R.
Rogalev, Andrei
Stampe, Kirstine A.
Manvell, Anna S.
Kubus, Mariusz
Pedersen, Kasper S.
Aribot, Frédéric
McPherson, James N.
Baran, Volodymyr
Le, Manh Duc
Chanda, Amit
Deylamani, Sara Talebi
Wan, Wenjie
Voigt, Laura
Coletta, Marco
Walker, Helen C.
Wilhelm, Fabrice
McMonagle, Charles J.
Pinkowicz, Dawid
Probert, Michael R.
Dunstan, Maja A.
Yutronkie, Nathan J.
Senyshyn, Anatoliy
Opis:
Bespoke van der Waals (vdW) crystals provide command over the confinement and transport of charge, spin, and heat within and between two-dimensional (2D) layers. We report a novel functionality in vdW crystals by actuating valence changes through molecular alloying. The net materials $Cr(pyrazine)_{2} Br_{2}$ and $Cr(pyrazine)_{2}I_{2}$ are aliovalent, hosting Cr(III) and Cr(II), respectively, due to disparate crystal field potentials. Pressurizing and thereby strengthening of the crystal field compresses the $Cr(pyrazine)_{2}I_{2}$ layers significantly, but no Cr valence change is induced. However, alloyed $Cr(pyrazine)_{2}I_{2−x}Br_{x}$ phases exhibit hysteretic and tunable Cr(II) ⇄ Cr(III) interconversions with concomitant charge injection into the net. The valence switch manifests drastic changes to the magnetization and the electrical conductivity, which varies by up to five orders of magnitude during the valence conversion. This use of coordination chemistry addresses a gap in vdW and 2D materials science, where electronic structure engineering via valence change events has remained elusive.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł

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