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    Wyświetlanie 1-3 z 3
    Tytuł:
    Quaternary stratigraphy and palaeogeography of Poland
    Autorzy:
    Marks, L.
    Dzierżek, J.
    Janiszewski, R.
    Kaczorowski, J.
    Lindner, L.
    Majecka, A.
    Makos, M.
    Szymanek, M.
    Tołoczko-Pasek, A.
    Woronko, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/138751.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Pleistocene
    Preglacial
    Palaeoclimate
    Molluscs
    Pollen analysis
    mountain glaciers
    Tatra Mts.
    plejstocen
    preglacjał
    paleoklimat
    mięczaki
    analiza pyłkowa
    lodowce górskie
    Tatry
    Opis:
    Though the stratigraphical and palaeogeographical framework of the Quaternary in Poland is still to be completed, several crucial points have been confirmed recently. The preglacial series, accepted for years as belonging to the Lower Pleistocene, is undoubtedly of Early Pliocene age, with a huge hiatus above almost until the uppermost Lower Pleistocene. The earliest glaciation in Poland (Nidanian) occurred at about 900 ka BP when the ice sheet reached the mid-southern part of the country. The following Podlasian Interglacial embraced the Brunhes/Matuyama boundary in the middle, in a similar fashion to the corresponding Cromerian Complex in Western Europe. The late Early and early Middle Pleistocene interglacials in Poland comprised 2-3 optima each, whereas every one of the younger interglacials was characterised by a single optimum only. The Late Vistulian ice sheet was most extensive in the western part of Poland (Leszno Phase) whereas the younger Poznań Phase was more extensive in the central and eastern part of the country. This was due to the varied distance from the glaciation center in Scandinavia, making the ice sheet margin reach a terminal position in different times. Palaeoclimatological research in the Tatra Mountains has provided new evidence for the atmospheric circulation over Europe. During cold phases of the Pleistocene in Poland a continental climate extended further westwards, quite the opposite that occurring during warmer intervals.
    Źródło:
    Acta Geologica Polonica; 2016, 66, 3; 403-427
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wykorzystanie analizy skupień w procesach poznawczych stratyfikacji przedsiębiorstw transportowych
    Cluster analysis application in cognitive processes of transport enterprise stratification
    Autorzy:
    Letkiewicz, A.
    Majecka, B.
    Suchanek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/134574.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    przedsiębiorstwo transportowe
    stratyfikacja
    analiza skupień
    cluster analysis
    economic stratification
    transport enterprises
    Opis:
    Celem artykułu jest wykazanie użyteczności narzędzia, jakim jest analiza skupień, w procesach porządkowania stratyfikacyjnego przedsiębiorstw transportowych. Analiza ta, pozwalając na wykrycie określonych struktur w przestrzeni rynku transportowego, może stać się punktem wyjścia do dalszych badań nad wyjaśnianiem procesów stratyfikacji podmiotów tego rynku.
    The research on transport may concern many issues, including the entity structures of the transport market, which is filled with diversified behavior of different entities, both on the supply and on the demand side of the market. On each of the sides one can observe layers of entities characterized by similar behavior – in the stratification systems of the market, individual entities in one layer show a similarity of the behavior, which is different between the layers. The goal of the article is to prove the usefulness of the cluster analysis in the processes of stratification arrangement of the transport enterprises. The analysis, by allowing the detection of particular structures in the transport market may become a starting point to further research on the explanation of stratification processes in that market. A ranking of transport and haulage enterprises, in which they were grouped according to the revenues in the year 2014 was used in the article. The procedure of k-means clustering and a further ANOVA were used to obtain the results which allow to conclude that there are in fact clusters on the market, which are different when it comes to crucial economic data. This leads to a conclusion that the use of presented research methods allows to show the processes on the transport market in a new way, thus proving the practical use of cluster analysis.
    Źródło:
    Problemy Transportu i Logistyki; 2016, 35, 3; 83-90
    1644-275X
    2353-3005
    Pojawia się w:
    Problemy Transportu i Logistyki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Instability of the environment at the end of the Eemian Interglacial as illustrated by the isopollen maps for Poland
    Autorzy:
    Kupryjanowicz, M.
    Granoszewski, W.
    Nalepka, D.
    Pidek, I. A.
    Walanus, A.
    Balwierz, Z.
    Fiłoc, M.
    Kołaczek, P.
    Majecka, A.
    Malkiewicz, M.
    Nita, M.
    Noryśkiewicz, B.
    Winter, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060182.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    palaeoclimate
    intra-interglacial cooling
    vegetation history
    isopolles
    pollen analysis
    Opis:
    Many terrestrial pollen profiles from Poland (and a few pollen records from other parts of Central Europe) show the end of the last interglacial (Eemian, MIS 5e) to have been characterized by climatic and environmental instability. This is expressed by a strong, rapid cooling in the middle part of the pine phase ending this interglacial (E7 regional pollen assemblage zone), and then a re-warming at the very end of this phase, immediately before the transition to the glacial conditions of the last glaciation (Vistulian, Weichselian, MIS 5d). We have characterized the regional distribution of these climatic fluctuations in Poland on the basis of isopollen maps prepared for the Eemian Interglacial based on palynological data from 31 Polish pollen profiles. These maps show unequivocally that the intra-interglacial cooling at the end of the Eemian Interglacial was a transregional phenomenon, which was reflected very clearly by a temporary openness of vegetation across the whole of Poland. It was associated with a distinct decrease in pine forest areas and an increase in birch forests and open communities of cold steppe type with a domination of Artemisia. The pronounced climate and environment instability during the last phase of the Eemian Interglacial may be consistent with it being a natural phenomenon, characteristic of transitional stages. Taking into consideration the currently observed global warming, coinciding with a natural cooling trend, the study of such transitional stages is important for understanding the underlying processes of climate change.
    Źródło:
    Geological Quarterly; 2016, 60, 1; 225--237
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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