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    Wyświetlanie 1-4 z 4
    Tytuł:
    Middle and Late Jurassic tube-dwelling polychaetes from the Polish Basin: diversity, palaeoecology and comparisons with other assemblages
    Autorzy:
    Słowiński, J.
    Vinn, O.
    Jäger, M.
    Zatoń, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/31341366.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    paleontology
    Sabellidae
    Serpulidae
    taxonomy
    tubeworm
    Mesozoic
    Polska
    Middle Jurassic
    Late Jurassic
    tube-dwelling polychaete
    diversity
    paleoecology
    Źródło:
    Acta Palaeontologica Polonica; 2022, 67, 4; 827-864
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Silicified sea life – Macrofauna and palaeoecology of the Neuburg Kieselerde Member (Cenomanian to Lower Turonian Wellheim Formation, Bavaria, southern Germany)
    Autorzy:
    Schneider, S.
    Jäger, M.
    Kroh, A.
    Mitterer, A.
    Niebuhr, B.
    Vodrážka, R.
    Wilmsen, M.
    Wood, C. J.
    Zágoršek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/139394.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Late Cretaceous
    Danubian Cretaceous Group
    macroinvertebrates
    facies
    Silica diagenesis
    stratigraphy
    kreda
    makrobezkręgowce
    facja
    krzemionka diageneza
    stratygrafia
    Opis:
    With approximately 100 species, the invertebrate macrofauna of the Neuburg Kieselerde Member of the Wellheim Formation (Bavaria, southern Germany) is probably the most diverse fossil assemblage of the Danubian Cretaceous Group. Occurring as erosional relicts in post-depositional karst depressions, both the Cretaceous sediments and fossils have been silicified during diagenesis. The Neuburg Kieselerde Member, safely dated as Early Cenomanian to Early Turonian based on inoceramid bivalve biostratigraphy and sequence stratigraphy, preserves a predominantly soft-bottom community, which, however, is biased due to near-complete early diagenetic loss of aragonitic shells. The community is dominated by epifaunal and semi-infaunal bivalves as well as sponges that settled on various (bio-) clasts, and may widely be split into an early bivalve-echinoid assemblage and a succeeding sponge-brachiopod assemblage. In addition to these groups we document ichnofauna, polychaete tubes, nautilids and bryozoans. The fauna provides evidence of a shallow to moderately deep, calm, fully marine environment, which is interpreted as a largescale embayment herein. The fauna of the Neuburg Kieselerde Member is regarded as an important archive of lower Upper Cretaceous sea-life in the surroundings of the Mid-European Island.
    Źródło:
    Acta Geologica Polonica; 2013, 63, 4; 555-610
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat load and deuterium plasma effects on SPS and WSP tungsten
    Autorzy:
    Vilémová, M.
    Matějíček, J.
    Nevrlá, B.
    Chernyshova, M.
    Gasior, P.
    Kowalska-Strzeciwilk, E.
    Jäger, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/146910.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    tungsten
    fusion
    heat loading
    irradiation
    bubbles
    surface damage
    Opis:
    Tungsten is a prime choice for armor material in future nuclear fusion devices. For the realization of fusion, it is necessary to address issues related to the plasma–armor interactions. In this work, several types of tungsten material were studied, i.e. tungsten prepared by spark plasma sintering (SPS) and by water stabilized plasma spraying (WSP) technique. An intended surface porosity was created in the samples to model hydrogen/ helium bubbles. The samples were subjected to a laser heat loading and a radiation loading of deuterium plasma to simulate edge plasma conditions of a nuclear fusion device (power density of 108 W/cm2 and 107 W/cm2, respectively, in the pulse intervals up to 200 ns). Thermally induced changes in the morphology and the damage to the studied surfaces are described. Possible consequences for the fusion device operation are pointed out.
    Źródło:
    Nukleonika; 2015, 60, 2; 275-283
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A morganucodontan mammalia form from the Upper Jurassic Morrison Formation, Utah, USA
    Autorzy:
    Davis, Brian M.
    Jäger, Kai R.K.
    Rougier, Guillermo W.
    Trujillo, Kelli
    Chamberlain, Kevin
    Powiązania:
    https://bibliotekanauki.pl/articles/2216314.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Mammalia
    Morganucodonta
    dentition
    Jurassic
    Morrison Formation
    Opis:
    We describe two skull fragments of a new morganucodontan from the Cisco Mammal Quarry (Upper Jurassic Morrison Formation), preserving portions of the palate and snout in excellent 3D detail as well as the complete upper postcanine dentition. Morganucodontans are best known by isolated elements and relatively complete skulls of several species of Morganucodon from the Lower Jurassic of Wales and China; this group is fundamental to our understanding of the early evolution of mammals. Cifellilestes ciscoensis gen. et sp. nov. possesses derived features of the snout paired with plesiomorphic construction of the molars; the distal premolars are complex and there is an unusually low count (two) of strongly imbricated molars. This character combination expands craniodental variation for the group. We sampled mudstone from the Cisco Mammal Quarry for ash-fall zircon analysis and obtained a date of 151.50 ± 0.28 Ma. This dates the locality to the earliest Tithonian and slightly younger than other major dated mammalbearing localities in the Morrison Formation. Cifellilestes represents one of the youngest members of this group and extends the record of morganucodontans in North America by more than 30 Ma. Morganucodontans are a rare component of Late Jurassic faunas but display surprising dental diversity through variations in a tooth count and cusp morphology of a deeply conserved, generalized mammalian tooth pattern, which was fully established in brasilodontid (non-mammalian) ancestors at least 80 my prior.
    Źródło:
    Acta Palaeontologica Polonica; 2022, 67, 1; 77-93
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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