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    Wyświetlanie 1-3 z 3
    Tytuł:
    A hybrid approach for fault diagnosis of spur gears using Hu invariant moments and artificial neural networks
    Autorzy:
    Rex, F. Michael Thomas
    Andrews, A.
    Krishnakumari, A.
    Hariharasakthisudhan, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/220768.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gear fault
    Ahao-Atlas-Marks
    time-frequency domain features
    Hu invariant moments
    ANN
    Opis:
    Achieving a reliable fault diagnosis for gears under variable operating conditions is a pressing need of industries to ensure productivity by averting unwanted breakdowns. In the present work, a hybrid approach is proposed by integrating Hu invariant moments and an artificial neural network for explicit extraction and classification of gear faults using time-frequency transforms. The Zhao-Atlas-Marks transform is used to convert the raw vibrations signals from the gears into time-frequency distributions. The proposed method is applied to a single-stage spur gearbox with faults created using electric discharge machining in laboratory conditions. The results show the effectiveness of the proposed methodology in classifying the faults in gears with high accuracy.
    Źródło:
    Metrology and Measurement Systems; 2020, 27, 3; 451-464
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The potential and pitfalls of exploiting nitrogen fixing bacteria in agricultural soils as a substitute for inorganic fertiliser
    Autorzy:
    Cummings, S. P.
    Humphry, D. R.
    Santos, S. R.
    Andrews, M.
    James, E. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/363190.pdf
    Data publikacji:
    2006
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    szczepionka
    żyzność gleby
    rolnictwo
    taksonomia
    Rhizobium
    Rhizobial inoculants
    soil fertility
    agriculture
    taxonomy
    rhizobia
    Opis:
    Nitrogen fixing bacteria have been used for centuries to improve the fertility of agricultural soils. Since the introduction of inorganic nitrogen (N) fertiliser that provides a reliable boost to crop yields whilst reducing land and labour requirements, the use of biological nitrogen fixation has been in decline. Recently, concerns have been expressed about the sustainability of inorganic N fertiliser application, however, there remain doubts about whether N2 fixing bacteria alone can provide agriculture with sufficient fixed N to feed a burgeoning global population. In this paper we review the current state of our knowledge regarding those diazotrophic bacteria that have a role to play in agriculture. We focus on our current areas of research, particularly, the importance of understanding the classification and mechanism of action of N2 fixing bacteria that are used in agricultural soils. We discuss the applications of N2 fixing bacteria that illustrate their potential to provide sustainable N, particularly focussing on Australian and South American agricultural systems where these bacteria are widely exploited to maintain soil fertility. We also identify problems with the use of bacteria as inoculants, including ineffective inoculation due to poor quality preparation, the use of appropriate isolates and issues with sustainability. We review the outlook for biological N fixation highlighting how molecular biology may enable the expression of N fixation in non-leguminous crops.
    Źródło:
    Environmental Biotechnology; 2006, 2, 1; 1-10
    1734-4964
    Pojawia się w:
    Environmental Biotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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