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    Wyświetlanie 1-6 z 6
    Tytuł:
    Późnoplejstoceńska i holoceńska ewolucja torfowiska Durne Bagno (Polesie Lubelskie)
    Late Pleistocene and Holocene evolution of the Durne Bagno peat bog (Lublin Polesie
    Autorzy:
    Bałaga, K.
    Dobrowolski, R.
    Rodzik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074412.pdf
    Data publikacji:
    2006
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    torfowisko
    osad biogeniczny
    analiza litofacjalna
    Polesie Lubelskie
    Late Glacial
    Holocene
    peat bog
    marshland
    Lublin Polesie
    Opis:
    The Durne Bagno peat bog is the eastern, peripheral part of a large marshland complex in the Lublin Polesie. Limnic biogenic deposits occurring directly on mineral deposits are up to 8.5 m thick. They exhibit great vertical facial variability and small lateral differentiation. This indicates that the conditions of sedimentation/sedentation were similar in the whole basin in particular time intervals. The chronostratigraphically-correlated sequence of sediments allows reconstruction of the geosystem evolution in recent 13 ka BP. In its entire Late Glacial and Holocene history two basic stages may be distinguished: lacustrine (OD — middle AT) and mire (middle AT — present time)
    Źródło:
    Przegląd Geologiczny; 2006, 54, 1; 68-72
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strukturalne uwarunkowania rzeźby Wyżyny Lubelskiej i Roztocza
    Structural control on the relief in the Lublin Upland and the Roztocze region
    Autorzy:
    Dobrowolski, R.
    Harasimiuk, M.
    Brzezińska-Wójcik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075098.pdf
    Data publikacji:
    2014
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    structural morphology
    structure of Upper Cretaceous rock massif
    neotectonics
    Lublin Upland
    Roztocze region
    struktura morfologiczna
    skalne stryuktury dolnokredowe
    masyw górski
    neotektonika
    Wyżyna Lubelska
    Roztocze
    Opis:
    The main relief features of the Lublin Upland (sensu Jahn, 1956) and Roztocze were formed during the early and middle Cenozoic stages of the Meta-Carpathian Ridge morphogenesis. They are clearly conditioned by the structure of the Upper Cretaceous-Palaeogene complex of the marginal part of the East European Craton. The following factors were of fundamental significance for the relief development in the study area: 1) Alpine and modern tectonic activity, which conditioned the horst nature of some morphostructures and the type of fissuring of rock massif, and 2) lithological diversity of the Upper Cretaceous-Palaeogene complex as well as the Miocene and Pliocene deposits, which influenced its strength features.
    Źródło:
    Przegląd Geologiczny; 2014, 62, 1; 51--56
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Potential landslide hazard in a zone of stabilised earthen embankments illustrated by Wysoka Gorka in Chełm
    Autorzy:
    Demczuk, P.
    Zydron, T.
    Dobrowolski, R.
    Dzieńkowski, T.
    Słuch, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/905260.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Opis:
    Plant cover is an important element in the management of earthen structures and slopes improving their aesthetic values and limiting their vulnerability to denudation processes. With regard to landslide hazards, an important aspect in the presence of plants is the effect of their root systems on the shear strength of the substrate and, consequently, on slope stability. The aim of the study was to determine the impact of the tree cover at the Wysoka Górka archaeological site on the stability of the earthen embankment on Góra Katedralna in Chełm (Lublin Province). These architectural elements originate from the times of Chełm’s glory in the first half of the 13th century, when it became the capital of Halych-Volhynia Duchy and a residence of Prince Danylo Romanovych (Isaiecić 1999). The research involved identification of the geological structure of the embankment (surveying, measurement of the filtration coefficient) and laboratory determination of the geotechnical parameters of the soil (particle size distribution and soil compressive strength measured in a triaxial compression apparatus). In the next stage of the study, stability was calculated with limit equilibrium methods in the GeoStudio program. Standard calculations of the embankment stability were performed and the stability coefficient for the slope devoid of vegetation and the tree-covered slope were compared assuming zero suction pressure. The shear strength parameters of soil reinforced by plant roots were adopted following the recommendations specified by Hubble et al. (2013). The authors performed a probabilistic analysis in order to determine the probability of critical values of the safety factor (<1.0) and comparative stability calculations, taking into account hydrological effects for the tree-covered and tree-devoid (after felling the trees) embankments (Sonnenberg et al. 2010, Simon and Collison 2002). The results of the stability calculations demonstrated that the presence of viable plant roots in the substrate increased slope stability, and the presence of tree stands at the bottom of the embankment appeared to be more favourable. Modelling the slope stability with consideration of the effect of atmospheric factors has shown that the presence of woody vegetation contributed to increased water infiltration into the embankment, resulting in reduction of suction pressure. In turn, tree felling led to reduction in suction pressure due to inhibition of evapotranspiration.
    Źródło:
    Polish Journal of Soil Science; 2018, 51, 1
    0079-2985
    Pojawia się w:
    Polish Journal of Soil Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of soil texture determined by two dispersion units of Mastersizer 2000
    Autorzy:
    Sochan, A.
    Bieganowski, A.
    Ryzak, M.
    Dobrowolski, R.
    Bartminski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/26394.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    soil texture
    sedimentation
    laser diffraction
    soil
    size distribution
    Malvern Mastersizer 2000 apparatus
    Opis:
    The comparison of particle size distributions measured by sedimentation methods and laser diffraction shows the underestimation of the fine (clay) fraction. This is attributed mainly to the shape of clay particles being different than spherical. The objective of this study was to demonstrate differences in the results of particle size distributions of soils determined with the method of laser diffraction using two different dispersion units of the Malvern Mastersizer 2000.
    Źródło:
    International Agrophysics; 2012, 26, 1
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanoscale Pattern Definition by Edge Oxidation of Silicon under the $Si_{3}N_{4}$ mask - PaDEOx
    Autorzy:
    Zaborowski, M.
    Grabiec, P.
    Dobrowolski, R.
    Panas, A.
    Skwara, K.
    Szmigiel, D.
    Wzorek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807538.pdf
    Data publikacji:
    2009-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.65.-k
    74.78.-w
    81.16.Nd
    81.16.Rf
    81.65.Cf
    Opis:
    Well-controlled method of Si nanopattern definition - pattern definition by edge oxidation have been presented. The technique is suitable for fabrication of narrow paths of width ranged from several tens of nm to several μm by means of photolithography equipment working with μm-scale design rules. Process details influencing a shape of the Si pattern have been discussed. SEM examinations have been presented.
    Źródło:
    Acta Physica Polonica A; 2009, 116, S; S-139-S-141
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Origin and Neoholocene evolution of spring-fed fens in Wardzyń, Łódź Upland, central Poland
    Autorzy:
    Dobrowolski, R.
    Ziułkiewicz, M.
    Okupny, D.
    Forysiak, J.
    Bałaga, K.
    Alexandrowicz, W. P.
    Buczek, A.
    Hałas, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060368.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    spring-fed fen
    calcareous tufa
    peatland
    Neoholocene
    Łódź Upland
    Central Poland
    Opis:
    Spring-fed fens in Wardzyń represent the rare group of alkaline mires supplied by artesian groundwater. Using multidisciplinary methods (including sedimentological, hydrometric and hydrochemical, pollen, macrofossil, malacological, geochemical, radiocarbon dating, and stable oxygen and carbon isotope analyses) we have been able to (1) reconstruct the main phases of spring-fed fen development, and to (2) determine the cause of Neoholocene groundwater ascension responsible for the mire inception. These phases are characterized by cyclic organic (peat) and carbonate (tufa) sedimentation associated with the Holocene fluctuations in humidity and temperature. The beginning of the activation of hydrological systems (involving the flow of confined groundwater of the Cretaceous aquifer) at Wardzyń occurred in the Subboreal period of the Holocene, after a long episode of decreased humidity initiated ca. 4.2 ka cal BP.
    Źródło:
    Geological Quarterly; 2017, 61, 2; 413--434
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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