نتایج جستجو برای: air filtration

تعداد نتایج: 242582  

2013
A. B. Cecala J. A. Organiscak J. D. Noll

Over the past decade, a substantial effort has been made to improve the air quality inside enclosed cabs of both underground and surface mobile mining equipment to reduce respirable dust exposures by the equipment operators. As part of this effort, the U.S. National Institute for Occupational Safety and Health, (NIOSH) completed a comprehensive laboratory study that determined the significant f...

Journal: :African health sciences 2012
S Sudharsanam S Swaminathan A Ramalingam G Thangavel R Annamalai R Steinberg K Balakrishnan P Srikanth

OBJECTIVES Study was conducted to assess whether temporal variation exists in airborne microbial concentrations of a hospital ward (west-Chennai, India) using active and passive methods, and characterise the microorganisms. METHODS Air samples (duplicates) were collected simultaneously using exposed-plate, impingement (BioSampler) and filtration (personal sampling filter cassette loaded with ...

Journal: :International journal of occupational safety and ergonomics : JOSE 2000
K Majchrzycka

The study concerns ways to describe filtration efficiency and gas flow resistance while particles are deposited in fibrous respiratory protective filters under conditions characteristic for their use. The performance of fibrous filter materials of varied structure and electrostatic properties was studied, using polydisperse coarse-grained aerosols and submicron aerosols of sodium chloride. Evid...

Journal: :Facta Universitatis, Series: Working and Living Environmental Protection 2018

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