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    Wyświetlanie 1-6 z 6
    Tytuł:
    The crust structure of the Morasko meteorite – a preliminary hypothesis
    Autorzy:
    Stankowski, W. T. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/94595.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    sintered crust
    fusion crust
    genesis
    SEM
    EDS
    skorupa
    geneza
    Opis:
    A small piece of the Morasko meteorite, weighing 970 g, yields traces of its journey through the Earth’s atmosphere and of its impact into a mineral substrate, such as reflected in the meteorite’s crust. This is seen in the crust structure in the form of sintered as well as fusion and semi-fusion layers for which ablative niches are optimum sites. Subsequent weathering processes have resulted in significant mineralogical changes in the crusts. The meteorite crusts originated during polygenetic processes.
    Źródło:
    Geologos; 2017, 23, 1; 53-56
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The extraterrestrial matter falls in west-central Poland (Great Poland Lowland); historical and geological data
    Autorzy:
    Stankowski, W. T. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/138672.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    meteorite chronology
    Great Poland Lowland
    meteoryt
    chronologia
    Nizina Wielkopolska
    Opis:
    Direct and indirect evidence of falls of extraterrestrial matter in west-central Poland (Great Poland Lowland) is proved historically and environmentally. The chronological list of such events has historical (documents, medieval paintings, newspaper reports), geological and morphological documentation. The most important are the environmental sites of Morasko/Oborniki, Przełazy and Jankowo Dolne, where metallic meteorites were recognized. These meteorite falls represent a series of cosmic events: the Morasko fall was c. 5000 years BP, the Przełazy fall was c. 10000 years BP, and the age of the Jankowo Dolne fall is not fully documented.
    Źródło:
    Acta Geologica Polonica; 2015, 65, 2; 263-268
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dating the Morasko meteorite fall by natural thermoluminescence of the fusion crust
    Autorzy:
    Fedorowicz, S.
    Stankowski, W. T. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/94222.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    iron meteorite
    terrestrial age
    dosimetry
    Polska
    meteoryt żelazny
    dozymetria
    Polska
    Opis:
    The date of fall of the Morasko iron meteorite was determined by means of thermoluminescence measurements of the fusion crust and related local materials. Three small pieces, commonly referred to as ‘shrapnel’, were used. The results obtained are 4.5–5.0 ka, which is in good agreement with previous estimates of 4–6 ka on the basis of radiometric, dosimetric and palynological methods.
    Źródło:
    Geologos; 2016, 22, 3; 251-258
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Suitability of soils developed on the basis of black coal ash as a forest habitat
    Autorzy:
    Tomaszewicz, T.
    Chudecka, J.
    Gamrat, R.
    Stankowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/905411.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Opis:
    The aim of the study was to evaluate the usefulness as a forest habitat, the technogenic soils developed by applying overlays containing organic matter in the waste substances, onto the layer of black coal ash. Properties of these soils, located in the power plant “Dolna Odra” in Nowe Czarnowo (West-Pomeranian province), were studied in 2015, i.e. 13 years after founding the experiment upon the use of waste materials in soilless land reclamation. Analysis required samples from the ash overlays and bottoms of the soils, in which applying methods commonly used in soil science, following properties were determined to enable calculation of the indicators used in the evaluation: forest soil trophism index (FSTI), soil site index (SSI), and mine soil quality index (MSQI). Values of FSTI allowed for classify studied soils as forest habitats, values of SSI as mixed forests and forest habitats, and values of MSQI as mixed forest habitats.
    Źródło:
    Polish Journal of Soil Science; 2017, 50, 2
    0079-2985
    Pojawia się w:
    Polish Journal of Soil Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    HEVC Encoding Assisted with Noise Reduction
    Autorzy:
    Stankiewicz, O.
    Wegner, K.
    Karwowski, D.
    Stankowski, J.
    Klimaszewski, K.
    Grajek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/226110.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    HEVC encoding
    encoder control
    model selection optimization
    noise reduction
    Opis:
    Optimization of encoding process in video compression is an important research problem, especially in the case of modern, sophisticated compression technologies. In this paper, we consider HEVC, for which a novel method for selection of the encoding modes is proposed. By the encoding modes we mean e.g. coding block structure, prediction types and motion vectors. The proposed selection is done basing on noise-reduced version of the input sequence, while the information about the video itself, e.g. transform coefficients, is coded basing on the unaltered input. The proposed method involves encoding of two versions of the input sequence. Further, we show realization proving that the complexity is only negligibly higher than complexity of a single encoding. The proposal has been implemented in HEVC reference software from MPEG and tested experimentally. The results show that the proposal provides up to 1.5% bitrate reduction while preserving the same quality of a decoded video.
    Źródło:
    International Journal of Electronics and Telecommunications; 2018, 64, 3; 285-292
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Compressed Data Stream Content in HEVC Video Encoder
    Autorzy:
    Stankowski, J.
    Karwowski, D.
    Grajek, T.
    Wegner, K.
    Siast, J.
    Klimaszewski, K.
    Stankiewicz, O.
    Domański, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/227246.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    HEVC
    video compression
    compressed data stream analysis
    Opis:
    In this paper, a detailed analysis of the content of the bitstream, produced by the HEVC video encoder is presented. With the use of the HM 10.0 reference software the following statistics were investigated: 1) the amount of data in the encoded stream related to individual frame types, 2) the relationship between the value of the QP and the size of the bitstream at the output of the encoder, 3) contribution of individual types of data to I and B frames. The above mentioned aspects have been thoroughly explored for a wide range of target bitrates. The obtained results became the basis for highlighting guidelines that allow for efficient bitrate control in the HEVC encoder.
    Źródło:
    International Journal of Electronics and Telecommunications; 2015, 61, 2; 121-127
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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