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    Wyświetlanie 1-3 z 3
    Tytuł:
    Influence of top layer density and thickness on hardness of two-layer floor elements
    Autorzy:
    Grześkiewicz, Marek
    Kozakiewicz, Paweł
    Borysiuk, Piotr
    Romanovski, Valerjan
    Cichy, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/962355.pdf
    Data publikacji:
    2020
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    floor elements
    ash wood
    pine wood
    top layer thickness
    wood hardness
    two-layer floor
    Opis:
    The subject of this paper is testing the hardness of two-layer floor materials with top layer made of ash wood in tangential cut, and bottom layer made of pine wood, radial cut, with cross wood fibre layout in both layers. Tests were carried out for top layer thickness 6.6 mm, 4.0 mm and 2.0 mm. Strong correlations were noticed between the hardness of floor elements and the density of the top layer for each thickness variant. Overall statistically significant influence of bottom layer density on the hardness of two-layer floor elements was observed in samples whose top layer was 2.0 mm thick.
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2020, 62, 205; 69-80
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The contribution of the fine sediment fraction to the Fluffy Layer Suspended Matter (FLSM)
    Autorzy:
    Pempkowiak, J.
    Beldowski, J.
    Pazdro, K.
    Staniszewski, A.
    Leipe, T.
    Emeis, K.C.
    Powiązania:
    https://bibliotekanauki.pl/articles/48591.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    sediment fraction
    Pomeranian Bay
    Fluffy Layer Suspended Matter
    polonium
    Baltic Sea
    radioisotope
    sea floor
    lead
    Opis:
    Fluffy Layer Suspended Matter (FLSM) is a layer of fairly concentrated suspended matter resting on the sea floor. Its passage to the depositional basins in the Pomeranian Bay – Arkona Deep System of the Baltic Sea is estimated to take around six months. In the course of this migration, the properties of FLSM change as a result of ageing and the influx of fresh particles from the water column, and possibly also because of mass exchange with the uppermost sediment layers. Measurements of radioisotopes (210Po, 210Pb, 137Cs) have demonstrated that in shallow water this topmost layer of sediments, from 8 cm to 3 cm in thickness, is subject to mixing. This creates redox profiles favourable to biota and bioturbation. Basing on 210Pb/210Po disequilibria and the 210Po excess, it was estimated that under steady state conditions from 1.5 to 2.2% of fine fraction (FSF) in the mixed layer of sediments is freshly imported from FLSM. This implies replacement of FSF from the sediments and its incorporation into FLSM. On the assumption that the surface density of FLSM is 10 mg cm−2, FSF freshly exported from sediments actually comprises up to 15% of FLSM. Therefore, the properties of FLSM are strongly influenced by the processes taking place in the sediments, although FLSM by definition is independent of sediments.
    Źródło:
    Oceanologia; 2002, 44, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Water Reservoirs Under Construction as a Result of the Activities of “Konin” and “Adamów” Brown Coal Mines
    Autorzy:
    Gilewska, M.
    Otremba, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/123135.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    post exploitation opencast pits
    floor layer
    Miocene sediments
    pyrite
    water reclamation
    Opis:
    Post-exploitation opencast pits constitute a final stage of mining activities and turning them into public utility facilities is taking place now by their water reclamation. They constitute basins without outflows with the depth of 15 to 69 m and areas ranging from 2.5 to 692 ha. The bottoms of these basins are situated in pyrite-containing Miocene formations. Products of Fe2S weathering comprise sulphuric acid and iron compounds – sulphate II and sulphate III. This study presents the basic parameters of the reservoirs constructed in the final opencast pits of the “Konin” and “Adamów” brown coal mine,s as well as the properties of the formations making up the bottoms of two water reservoirs under construction: Lubstów and Władysławów. It is evident from the performed investigations that these formations are characterised by very acid reaction and very high exchangeable acidity. The total sulphur content ranges from 446 to 962 mg·kg -1 of the ground and that of sulphate sulphur – from 71 to 187 mg·kg -1 of the ground. The chemism of these grounds will exert influence on the quality of water accumulating in the opencast pits during the initial period of their spontaneous flooding. Together with the increase of the capacity of these reservoirs, the contact of waters with boulder clays of the Warta River glaciation abounding in calcium compounds will increase and concentrations of calcium ions in the waters of the reservoirs will also grow.
    Źródło:
    Journal of Ecological Engineering; 2015, 16, 5; 138-143
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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