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    Wyświetlanie 1-5 z 5
    Tytuł:
    Internal Friction and Microstructure of Ti and Ti-Mo Alloys Containing Oxygen
    Autorzy:
    Martins Jr, J. R. S.
    Araújo, R. O.
    Nogueira, R. A.
    Grandini, C. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/351840.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mechanical spectroscopy
    anelasticity
    internal friction
    Ti-Mo alloys
    interstitials
    biomaterials
    Opis:
    Ti-Mo alloys are promising materials for use as biomaterials, because these alloys have excellent corrosion resistance and a good combination of mechanical properties such as fatigue, low elastic modulus, hardness, and wear resistance. The objective of this paper was to study the effect of heavy interstitial atoms on anelastic properties of Ti-Mo alloys using mechanical spectroscopy. The internal friction and Young’s modulus were measured as a function of temperature using dynamic mechanical analyser. The internal friction spectra were brought about by relaxation processes attributed to shortrange stress induced reorientation of interstitial and substitutional complexes in solid solution. It is suggested that the nature of the relaxing entities can be worked out in further research on Ti-Mo single crystals.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 1; 25-30
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The dentition of megalosaurid theropods
    Autorzy:
    Hendrickx, C.
    Mateus, O.
    Araujo, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/21070.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    Theropod teeth are particularly abundant in the fossil record and frequently reported in the literature. Yet, the dentition of many theropods has not been described comprehensively, omitting details on the denticle shape, crown ornamentations and enamel texture. This paucity of information has been particularly striking in basal clades, thus making identification of isolated teeth difficult, and taxonomic assignments uncertain. We here provide a detailed description of the dentition of Megalosauridae, and a comparison to and distinction from superficially similar teeth of all major theropod clades. Megalosaurid dinosaurs are characterized by a mesial carina facing mesiolabially in mesial teeth, centrally positioned carinae on both mesial and lateral crowns, a mesial carina terminating above the cervix, and short to well-developed in-terdenticular sulci between distal denticles. A discriminant analysis performed on a dataset of numerical data collected on the teeth of 62 theropod taxa reveals that megalosaurid teeth are hardly distinguishable from other theropod clades with ziphodont dentition. This study highlights the importance of detailing anatomical descriptions and providing additional morphometric data on teeth with the purpose of helping to identify isolated theropod teeth in the future.
    Źródło:
    Acta Palaeontologica Polonica; 2015, 60, 3
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new plesiosauroid from the Toarcian (Lower Jurassic) of Alhadas, Portugal
    Autorzy:
    Smith, A.S.
    Araujo, R.
    Mateus, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/22142.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    new plesiosauroid
    plesiosauroid
    Toarcian
    Lower Jurassic
    Jurassic
    paleontology
    Alhadas
    Portugal
    Elasmosauridae
    Plesiosauridae
    Plesiosauria
    Lusonectes sauvagei
    plesiosaur
    Lusitanian basin
    Opis:
    A partial plesiosauroid skull from the São Gião Formation (Toarcian, Lower Jurassic) of Alhadas, Portugal is re−evaluated and described as a new taxon, Lusonectes sauvagei gen. et sp. nov. It has a single autapomorphy, a broad triangular parasphenoid cultriform process that is as long as the posterior interpterygoid vacuities, and also a unique character combination, including a jugal that contacts the orbital margin, a distinct parasphenoid–basisphenoid suture exposed between the posterior interpterygoid vacuities, lack of an anterior interpterygoid vacuity, and striations on the ventral surface of the pterygoids. Phylogenetic analysis of Jurassic plesiosauroids places Lusonectes as outgroup to “microcleidid elasmosaurs”, equivalent to the clade Plesiosauridae. Lusonectes sauvagei is the only diagnostic plesiosaur from Portugal, and the westernmost occurrence of any plesiosaurian in Europe.
    Źródło:
    Acta Palaeontologica Polonica; 2012, 57, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Proposal of heuristic regression method applied in descriptive data analysis: case studies
    Autorzy:
    Gomes, F. A.
    Assis, A. de O.
    Reis, M. R. da C.
    Gomes, V. M.
    Oliveira, S. G. M.
    Araujo, W. R. H. de
    Calixto, W. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/136229.pdf
    Data publikacji:
    2017
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    regression
    data analysis
    optimization
    heuristic
    modeling
    Opis:
    The purpose of this paper is to use the hybridized optimization method in order to find mathematical structures for analysis of experimental data. The heuristic optimization method will be hybridized with deterministic optimization method in order to that structures found require not knowledge about data generated experimentally. Five case studies are proposed and discussed to validate the results. The proposed method has viable solution for the analysis of experimental data and extrapolation, with mathematical expression reduced.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2017, 2, 2; 51-57
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulated nuclear contamination scenario, solid cancer risk assessment, and support to decision
    Autorzy:
    Lima, Sergio X.
    Costa, Karolina P. S.
    Lima, Zelmo R.
    Rother, Fagner C.
    Araujo, Olga M. O.
    Vital, Helio C.
    Brum, Tercio
    Junior, Wilson F. R. S.
    Amorim, Jose Carlos C.
    Healy, Matthew J. F.
    Andrade, Edson R.
    Powiązania:
    https://bibliotekanauki.pl/articles/146554.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    improvised nuclear device
    IND
    induced cancer
    risk assessment
    decision
    ocena ryzyka
    decyzja
    Opis:
    The detonation of an (hypothetical) improvised nuclear device (IND) can generate atmospheric release of radioactive material in the form of particles and dust that ultimately contaminate the soil. In this study, the detonation of an IND in an urban area was simulated, and its effects on humans were determined. The risk of solid cancer development due to radiation was calculated by taking into account prompt radiation and whole-body exposure of individuals near the detonation site up to 10 km. The excess relative risk (ERR) of developing solid cancer was evaluated by using the mathematical relationships from the Radiation Effects Research Foundation (RERF) studies and those from the HotSpot code. The methodology consists of using output data obtained from simulations performed with the HotSpot health physics code plugging in such numbers into a specific given equation used by RERF to evaluate the resulting impact. Such a preliminary procedure is expected to facilitate the decision-making process significantly.
    Źródło:
    Nukleonika; 2019, 64, 2; 41-48
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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