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    Wyświetlanie 1-2 z 2
    Tytuł:
    Voltage sag source location based on voltage measurements only
    Autorzy:
    Leborgne, R. Ch.
    Karlsson, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/262815.pdf
    Data publikacji:
    2008
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    power quality
    voltage sags (dips)
    source location
    Opis:
    This paper introduces an alternative method for voltage sag source location based on voltage information only. The source is located considering the sag magnitude at the primary and secondary side of a transformer. A comprehensive review of previously proposed methods based on voltage and current measurements is presented. The performance of the proposed method is compared with the previous ones using PSCAD /EM TDC on a model of a regional network including transmission and sub-transmission levels. Moreover, the sag magnitude method is applied on a set of measurements taken from the regional network during a one year sag survey. The results show the good performance of the new method and its unique applicability in cases where only voltages are recorded, such as the sag survey presented.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2008, 14, 1; 25-30
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chronic respiratory symptoms of poultry farmers and model-based estimates of long-term dust exposure
    Autorzy:
    Guillam, M.T.
    Pedrono, G.
    Le Bouquin, S.
    Huneau, A.
    Gaudon, J.
    Leborgne, R.
    Dewitte, J.D.
    Segala, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/51420.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    chronic respiratory disease
    poultry farm
    farmer
    long-term exposure
    dust exposure
    occupational exposure
    respirable dust
    task
    environment monitoring
    chronic bronchitis
    bronchitis
    human disease
    occupational disease
    Opis:
    Objectives. The airborne contaminant exposure levels experienced by poultry farmers have raised concerns about the possible health hazards associated with them. Thus, a longitudinal project was instituted in France to monitor these exposures in poultry workers and to evaluate the long-term effect on health. Method. Sixty-three workers in two different poultry housing systems were included (33 from floor-based systems and 30 from cage-based systems). Personal dust concentrations (over 2 days) and activity patterns (over 14 days) were collected and then modeled to obtain average long-term estimates. Health data were collected by questionnaire. Results. The mean daily time spent in the cage system was more than 2 hours longer than in the floor system. Two main common tasks accounted for ~70% of this time. Dust concentrations were higher in the floor system than in the cage system. The concentrations for the 14 days of known activity patterns estimated using the statistical model agreed well with the measured values. Several chronic respiratory symptoms were significantly associated with the high levels of long-term exposure estimated by the model. The highest risk was for chronic bronchitis symptoms (>4-fold higher for exposures of 0.1 mg/m3 of respirable dust). Conclusion. The presented modeling strategy can be used to estimate the long-term average personal exposure to respirable dust, and to study the association between dust exposure and chronic respiratory symptoms. This population of workers will be followed-up in subsequent examinations (3 years later) to determine whether the predictive model is valid, and whether long-term dust exposure is related to the incidence of respiratory symptoms and changes in pulmonary functions.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2013, 20, 2
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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