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Wyszukujesz frazę "infrasound" wg kryterium: Temat

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    Wyświetlanie 1-2 z 2
    Tytuł:
    Effects of infrasound generated in urban areas on health of people and animals - an attempt to localize environmental infrasound sources using computer simulations
    Autorzy:
    Nowicki, G.
    Nowicki, T.J.
    Prystupa, A.
    Slusarska, B.
    Chemperek, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/3260.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    infrasound
    low-frequency sound zob.infrasound
    urban area
    human health
    health
    people
    animal health
    environmental infrasound source
    computer simulation
    Opis:
    Introduction. Inaudible but ubiquitous environmental infrasound undoubtedly affects the frame of mind and health of humans. Objective. The object of the study is to prove that civil engineering objects can be sources of infrasound, and a review of the literature on effects of infrasound on the health of people and animals. Methods. Computer simulation of an air flow around a typical element of outdoor infrastructure. The simulation was carried out using the author’s computer programme, based on Discrete Vortex Method algorithms. Results and conclusions. The numerical experiment clearly proved that industrial objects can be sources of infrasonic noise during windy weather. The picture of air flow around a cylinder shows that regular turbulent motion is a source of sound with one dominating frequency. The sound once generated propagate far from its source. Frequency and intensity of the sound depends on wind velocity and shape of the object. Further research in this area are advisable.
    Źródło:
    Journal of Pre-Clinical and Clinical Research; 2014, 08, 2
    1898-2395
    Pojawia się w:
    Journal of Pre-Clinical and Clinical Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exposure to infrasonic noise in agriculture
    Autorzy:
    Bilski, Bartosz
    Powiązania:
    https://bibliotekanauki.pl/articles/988973.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    infrasound
    infrasonic noise
    tractors
    combined-harvesters
    work hygiene
    occupational exposure
    agriculture
    Opis:
    Introduction and objectives. Although exposure to audible noise has been examined in many publications, the sources of infrasound in agriculture have not been fully examined and presented. The study presents the assessment of exposure to infrasound from many sources at workplaces in agriculture with examples of possible ergonomic and health consequences caused by such exposure. Materials and method. Workers’-perceived infrasonic noise levels were examined for 118 examples of moving and stationary agricultural machines (modern and old cab-type tractors, old tractors without cabins, small tractors, grinders, chargers, forage mixers, grain cleaners, conveyors, bark sorters and combine-harvesters). Measurements of infrasound were taken with the use of class 1 instruments (digital sound analyzer DSA-50 digital and acoustic calibrator). Noise level measurement swere performed in accordance with PN-Z-01338:2010, PN-EN ISO 9612:2011 and ISO 9612:2009. Results and conclusions. The most intense sources of infrasound in the study were modern and old large size types agricultural machinery (tractors, chargers and combined-harvesters, and stationary forage mixers with ventilation). The G-weighted infrasound levels were significant and at many analyzed workplaces stayed within or exceeded the occupational exposure limit (LG eq, 8h = 102 dB) when the duration of exposure is longer than 22 min./8-hours working day (most noisy – modern cab-type tractors), 46 min./8 hours working day (most noisy – old type cab-tractors), 73 min./8 hours working day (most noisy – old tractors without cabins), 86 min./8-hours working day (most noisy – combine-harvesters) and 156 min./8 hours working day (most noisy – stationary forage mixers with ventilation). All measured machines generated infrasonic noise exceeded the value LG eq, Te = 86 dB (occupational exposure limit for workplaces requiring maintained mental concentration). A very important harmful factor is infrasound exposure for pregnant women and adolescents at workplaces in agriculture. Very valuable work can be technical limiting exposure to infrasound from new and used agricultural machinery. The technical limitation of infrasound caused by both old and new agricultural machinery can be invaluable from the work point of view.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2017, 24, 1
    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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