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    Wyświetlanie 1-2 z 2
    Tytuł:
    Characteristics of fuel cells under static and dynamic conditions
    Autorzy:
    Szwajca, Filip
    Berger, Andrew W.
    Spalletta, Robert
    Pielecha, Ireneusz
    Powiązania:
    https://bibliotekanauki.pl/articles/32101706.pdf
    Data publikacji:
    2022-12-28
    Wydawca:
    Sieć Badawcza Łukasiewicz - Poznański Instytut Technologiczny
    Tematy:
    fuel cell stack
    fuel cell module
    static and dynamic characteristics
    fuel cell efficiency
    Opis:
    Modern internal combustion powertrains are the main source of propulsion for on-road and non-road vehicles. However, they are increasingly being replaced by electric or fuel cell-equipped alternative propulsion systems. The article presents a study of fuel cell characteristics operating under both static and dynamic conditions, with a 1.2 kW fuel cell set with a voltage converter and lead-acid batteries. In the conducted tests, the fuel cell stack's maximum efficiency reached 65%. Load tests (static and dynamic) have indicated higher fuel cell efficiencies when using hybrid operation with a DC/DC converter and battery.
    Źródło:
    Rail Vehicles/Pojazdy Szynowe; 2022, 3-4; 44-52
    0138-0370
    2719-9630
    Pojawia się w:
    Rail Vehicles/Pojazdy Szynowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Occupational exposure to nanoparticles originating from welding – case studies from the Czech Republic
    Autorzy:
    Berger, Filip
    Bernatíková, Šárka
    Kocůrková, Lucie
    Přichystalová, Radka
    Schreiberová, Lenka
    Powiązania:
    https://bibliotekanauki.pl/articles/2081915.pdf
    Data publikacji:
    2021-06-30
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    aerosol
    nanomaterials
    nanoparticles
    occupational exposure
    occupational exposure limit
    welding
    Opis:
    BackgroundNanomaterials are virtually ubiquitous as they are created by both natural processes and human activities. The amount of occupational exposure to unintentionally released nanoparticles can, therefore, be substantial. The aim of the study was to determine the concentrations of incidental nanoparticles that workers can be exposed to during welding operations and to assess related health risks. The specific focus on welding operations was determined based on the fact that other case studies on the manufacturing industry confirm significant exposure to incidental nanoparticles during welding. In the Czech Republic, 92% of all industrial workers are employed in the manufacturing industry, where welding operations are amply represented.Material and MethodsThe particle number concentrations of particles in the size range of 20–1000 nm and particle mass concentrations of inhalable and PM1 fractions were determined via measurements carried out at 15-minute intervals for each welding operation by static sampling in close proximity to the worker. Measurements were obtained using the following instruments: NanoScan SMPS 3910, Optical Particle Sizer OPS 3330, P-TRAK 8525 and DustTrak DRX 8534. The assessed operations were manual arc welding and automatic welding.ResultsThe observed average particle number concentrations for electric arc welders ranged 84×103–176×103 #/cm3, for welding machine operators 96×103–147×103 #/cm3, and for a welding locksmith the obtained average concentration was 179×103 #/cm3. The determined average mass concentration of PM1 particles ranged 0.45–1.4 mg/m3.ConclusionsBased on the conducted measurements, it was confirmed that there is a significant number of incidental nanoparticles released during welding operations in the manufacturing industry as a part of production and processing of metal products. The recommended occupational exposure limits for nanoparticle number concentrations were exceeded approximately 4–8 times for all assessed welding operations. The use of local exhaust ventilation in conjunction with personal protective equipment, including FFP2 or FFP3 particle filters, for welding is, therefore, recommended. Med Pr. 2021;72(3):219–30
    Źródło:
    Medycyna Pracy; 2021, 72, 3; 219-230
    0465-5893
    2353-1339
    Pojawia się w:
    Medycyna Pracy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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