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    Wyświetlanie 1-2 z 2
    Tytuł:
    Effects of hydrocarbon contamination on the engineering geological properties of Neogene clays and Pleistocene glacial tills from Central Poland
    Autorzy:
    Dobak, Paweł
    Izdebska-Mucha, Dorota
    Stajszczak, Piotr
    Wójcik, Emilia
    Kiełbasiński, Kamil
    Gawriuczenkow, Ireneusz
    Szczepański, Tomasz
    Zawrzykraj, Piotr
    Bąkowska, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/24024696.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    petroleum products
    contamination
    clay soils
    permeability
    shear strength
    swelling
    particle size distribution
    produkty naftowe
    zanieczyszczenia
    grunty spoiste
    przepuszczalność
    wytrzymałość na ścinanie
    pęcznienie
    rozkład wielkości cząstek
    PSD
    Opis:
    Petroleum products influence the engineering behaviour of the soil. Neogene clays and glacial tills from Central Poland were tested under laboratory conditions to evaluate the changes of selected physical and mechanical parameters: particle size distribution, particle density, swelling, shear strength and permeability. Four petroleum products were used in the experiments: diesel fuel, kerosene, jet fuel and mineral engine oil. The study revealed that even for the lowest degree of contamination the values of physical and mechanical properties of the soils changed significantly. Greater variation can be expected in soils contaminated with high-viscosity compounds. Also, higher relative changes were found for glacial tills than for Neogene clays. Consolidation tests revealed changes in soil permeability depending on the soil composition and the physical properties of the contaminant – considerable reduction of permeability was observed for glacial tills contaminated with light Jet fuel, while the reduction was lower for Neogene clays. The obtained results indicate the role of mesopores and the dimensionless pore pressure coefficient in changes of soil permeability. The methodological issues regarding testing and analysing the hydrocarbon-contaminated soils were also presented and discussed, which might be useful for researchers studying contaminated soils.
    Źródło:
    Acta Geologica Polonica; 2022, 72, 4; 529--555
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of conductive particle contaminationon the insulation system of rotating electrical machines with direct oil cooling
    Autorzy:
    Yang, Liguo
    Pauli, Florian
    Zhang, Shimin
    Hambrecht, Fabian
    Hameyer, Kay
    Powiązania:
    https://bibliotekanauki.pl/articles/2135735.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cooling
    insulation system
    particle contamination
    partial discharge
    surface resistance
    Opis:
    An integration of the electrical machine and the gearbox is attracting particular attention for the design of modern electric and hybrid drive trains, since it saves overall space and subsequently increases the power density. Another benefit of a high level of integration is that it enables a combined application of oils as both cooling fluid for the electrical machine and as lubrication fluid for the transmission system. In this way, the power density of the integrated drive train can be further increased. During the oil cycling, conductive contaminations may be introduced and subsequently have an influence on the function of the insulation system of the electrical machine. In the present work, the influences of the cooling oil and its conductive contaminations, conductive particles as well as their combination with humidity, on the electrical and dielectric properties of the insulation system are studied. The results show that by application of the cooling oil, the partial discharge inception voltage (PDIV) of the winding insulation increases significantly so that an electrical breakdown is prone to happen before a partial discharge (PD) occurs. With increasing particle contamination, the PDIV of the insulation system decreases significantly, while the capacitance increases. Besides, conductive particles and humidity decrease the surface resistance and surface breakdown voltage of the insulation papers significantly. The results indicate that the conductive particle contaminations can play an important role for the electrical degradation of the insulation system.
    Źródło:
    Archives of Electrical Engineering; 2022, 71, 3; 789--804
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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