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    Wyświetlanie 1-5 z 5
    Tytuł:
    First tyrannosaurid remains from the Upper Cretaceous “El Gallo” Formation of Baja California, Mexico
    Autorzy:
    Peecook, B.R.
    Wilson, J.A.
    Hernandez-Rivera, R.
    Montellano-Ballesteros, M.
    Wilson, G.P.
    Powiązania:
    https://bibliotekanauki.pl/articles/21150.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    We report a complete left fourth metatarsal collected from rocks of the Upper Cretaceous (Campanian) “El Gallo” Formation exposed along the Pacific Ocean near El Rosario, Baja California, México. The metatarsal IV was part of an arctometatarsalian metatarsus, as evidenced by a deep medial notch proximally and extensive articulation for metatarsal III. This condition, along with the U-shape of the proximal end, supports identification as tyrannosauroid. It is assigned to Tyrannosauridae based on features on the posterior surface of the shaft, but finer taxonomic resolution is not possible. Compared to other tyrannosauroids, the metatarsal is relatively short, closely resembling the proportions of the gracile Albertosaurus sarcophagus rather than the much more massive, robust metatarsals of Tyrannosaurus rex. The Baja tyrannosaurid metatarsal is shorter than almost all other tyrannosauroid fourth metatarsals, raising the possibility that it pertains to an immature individual. North American tyrannosauroids are best known from the northern coast of the Western Interior Seaway, as well as less frequently on the southern coast of the seaway in Utah and New Mexico. The new record in Baja marks the first unambiguous skeletal material of a tyrannosaurid both in México and along the Pacific coast.
    Źródło:
    Acta Palaeontologica Polonica; 2014, 59, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Jurassic rhynchonellide brachiopods from the Jordan Valley
    Autorzy:
    Feldman, H.R.
    Schemm-Gregory, M.
    Ahmad, F.
    Wilson, M.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/23239.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Jurassic
    rhynchonellid brachiopod
    brachiopod
    Jordan Valley
    Brachiopoda
    Rhynchonellida
    Mughanniyya Formation
    Opis:
    Jurassic rhynchonellide brachiopods from the Jordan Valley are herein revised and new taxa are added to the faunal list. In this study of Jurassic rhynchonellides from Wadi Zarqa, northwestern Jordan, we recognize the following taxa: Eurysites rotundus, Cymatorhynchia quadriplicata, Daghanirhynchia triangulata, D. angulocostata, Pycnoria magna, Schizoria elongata, and Schizoria cf. intermedia. The following new taxa are described: Daghanirhynchia susanae sp. nov. and Amydroptychus markowitzi sp. nov. The Middle Jurassic Mughanniyya Formation of northwest Jordan is dominated by limestone beds. The sedimentary environment is interpreted as neritic, light, and nutrient−rich resulting in high faunal diversity. The high rhynchonellide endemism of this fauna is yet another confirmation of pronounced Middle Jurassic endemism along the southern Tethyan margin of the Ethiopian Province. Brachiopods of the Jordanian Mughanniyya Formation can be correlated with the fauna of the Aroussiah Formation in Sinai and the Zohar and Matmor formations in Southern Israel.
    Źródło:
    Acta Palaeontologica Polonica; 2012, 57, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of colored varieties of Brazilian quartz produced by gamma radiation
    Autorzy:
    Enokihara, Cyro T.
    Schultz-Güttler, Rainer A.
    R. Rela, Paulo
    Calvo, Wilson A. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/971525.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    gemstone treatment
    quartz color enhancements
    color centers
    quartz gamma irradiation
    Opis:
    Quartz occurs in Brazil mainly in two geological environments, called pegmatitic and hydrothermal. The quartz of hydrothermal origin occurs mainly in geodes in the basaltic rocks of the Parana Basin and the quartz formed in fracture systems of the Espinhaço Range. Quartz of pegmatitic origin forms often the core of pegmatites. The detailed mechanism of color center formation of these two types of quartz will be investigated by spectroscopic and chemical analysis. Until yet, it can be shown that due to chemical differences of the nature of mineral forming fluids, the two types behave differently. All quartz contains mainly traces of iron, aluminum, lithium and some amounts of water. The quartz of hydrothermal origin incorporated much structurally bound water, and despite some similarities with the chemical composition of pegmatitic quartz, this high water content is the reason for the formation of silanol radicals, giving green color to the quartz. The main difference in chemical composition of pegmatitic quartz is the presence of higher amounts of Al and Li, responsible for the brownish and yellowish colors formed by irradiation.
    Źródło:
    Nukleonika; 2013, 58, 4; 469-474
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic Properties of InAs/GaAs Self-Assembled Quantum Dot Structures and Devices Studied by Photocurrent Spectroscopy
    Autorzy:
    Mowbray, D. J.
    Fry, P. W.
    Skolnick, M. S.
    Itskevich, I. E.
    Harris, L.
    Ashmore, A. D.
    Finley, J. J.
    Wilson, L. R.
    Schumacher, K. L.
    Barker, J. A.
    O'Reilly, E. P.
    Al-Khafaji, M.
    Cullis, A. G.
    Hopkinson, M.
    Clark, J. C.
    Hill, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014190.pdf
    Data publikacji:
    2000-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.Fd
    73.61.Ey
    73.50.Pz
    42.55.Px
    Opis:
    The power of photocurrent spectroscopy to study the electronic properties of InAs/GaAs self-assembled quantum dots is described. From comparison of results from different samples it is shown that photocurrent provides a direct means to measure absorption spectra of quantum dots. Studies in high electric field enable the electron-hole vertical alignment to be determined. Most surprisingly this is found to be opposite to that predicted by all recent predictions. Comparison with theory shows that this can only be explained if the dots contain significant amounts of gallium, and have a severely truncated shape. The nature of the ground and excited state transitions, carrier escape mechanisms from dots, in-plane wave function anisotropies and the modal gain of a quantum dot laser are determined.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 3; 279-293
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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