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Wyszukujesz frazę "Wieczorek, S" wg kryterium: Autor

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Phytotests as tools for monitoring the bioremediation process of soil contaminated with diesel oil
    Autorzy:
    Wieczorek, D.
    Kwapisz, E.
    Marchut-Mikolajczyk, O.
    Bielecki, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/81156.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    phytotoxicity
    bioremediation
    monitoring
    diesel fuel
    fungal enzymatic preparation
    soil contamination
    hydrocarbon degradation
    gas chromatography
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2012, 93, 4
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Modified Aluminous Porcelain Subjected to Mechanoacoustic Tests
    Autorzy:
    Ranachowski, P.
    Ranachowski, Z.
    Wieczorek, K.
    Jaroszewski, M.
    Kudela, S. jr.
    Powiązania:
    https://bibliotekanauki.pl/articles/355059.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electrical porcelain materials
    ageing processes
    acoustic emission
    AE
    optical microscopy
    Opis:
    The paper presents the microscopic and mechanoacoustic study of degradation processes of the porcelain material C 130 type. This kind of material is used in the production of the most durable and reliable electrotechnical elements. Raw material composition of the studied porcelain was modified. This had an impact on the inner properties, cohesion and – in consequence – on operational properties of the material. Using mechanical-acoustic and microscopic methods of testing of small-size samples that were subjected to compression, it was possible to distinguish successive stages of degradation of the porcelain structure. These stages were generally typical of the porcelain materials. In the authors’ opinion, they are connected to the ageing process happening over many years of work under operating conditions. Optimization of composition and technological properties – important during technological processes – resulted in a slight decrease in inner cohesion of the porcelain. When compared to the reference material – typical domestic C 130 material, mechanical strength was somewhat lower. Carried out investigations proved that resistance of the investigated material to the ageing degradation process – during long term operation – also decreased. The improvement of technological parameters and the reduction in the number of defective elements occurred simultaneously with some decrease in the operational parameters of the material. To restore their initial high level, further work is needed to optimize the raw material composition of the porcelain.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 1821-1826
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Degradation Processes in Shield-Centring Elements of Surge Arresters
    Autorzy:
    Papliński, P.
    Śmietanka, H.
    Ranachowski, P.
    Ranachowski, Zbigniew
    Wieczorek, K.
    Kudela, S. jr.
    Powiązania:
    https://bibliotekanauki.pl/articles/2203744.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surge arrester
    TSE glass textolite
    discharge current
    EDS method
    Opis:
    This paper presents the results of testing samples of shield-centering elements from medium-voltage surge arresters. The elements were made of TSE glass textolite. The elements have been dismantled from different operated surge arresters, which were subjected to discharge currents (short-circuit currents) of different intensity and duration. The discharge currents led to degradation of the tested elements with various degrees of advancement. The degradation was investigated using microscopic methods and energy-dispersive X-ray spectroscopy (EDS). Changes in the content of elements of the surface of textolite materials - as the degradation progresses - were documented. It was found that high discharge current flows resulted in melting of the organic binder, epoxy resin, especially its surface layer. Partial charring and even burning of the resin was noticeable. Furthermore, it was found that with increasing degradation on the surface of the TSE laminate, the carbon and oxygen content, which are part of the organic resin, decreases. Simultaneously the amount of silicon, calcium and aluminium, which are present in the glass fibres, increases. The charring effect of the resin and the formation of conductive paths result in a decrease in the performance of surge arresters and their subsequent failure.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 237--242
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Developing automatic recognition system of drill wear in standard laminated chipboard drilling process
    Autorzy:
    Kurek, J.
    Kruk, M.
    Osowski, S.
    Hoser, P.
    Wieczorek, G.
    Jegorowa, A.
    Górski, J.
    Wilkowski, J.
    Śmietańska, K.
    Kossakowska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/200766.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    diagnostic expert systems
    neural networks
    wavelet packets
    wear monitoring
    diagnostyczny system ekspercki
    sieci neuronowe
    pakiety falkowe
    monitorowanie zużycia
    Opis:
    The paper presents an automatic approach to recognition of the drill condition in a standard laminated chipboard drilling process. The state of the drill is classified into two classes: “useful” (sharp enough) and “useless” (worn out). The case “useless” indicates symptoms of excessive drill wear, unsatisfactory from the point of view of furniture processing quality. On the other hand the “useful” state identifies tools which are still able to drill holes acceptable due to the required processing quality. The main problem in this task is to choose an appropriate set of diagnostic features (variables), based on which the recognition of drill state (“useful” versus “useless”) can be made. The features have been generated based on 5 registered signals: feed force, cutting torque, noise, vibration and acoustic emission. Different statistical parameters describing these signals and also their Fourier and wavelet representations have been used for defining the features. Sequential feature selection is applied to detect the most class discriminative set of features. The final step of recognition is done by using three types of classifiers, including support vector machine, ensemble of decision trees and random forest. Six standard drills of 12 mm diameter with tungsten carbide tips were used in experiments. The results have confirmed good quality of the proposed diagnostic system.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 3; 633-640
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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