id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-340639-hdn85mik	Uk Lee, Byung	Unipolar ion emission enhances respiratory protection against fine and ultrafine particles	2004-11-30		.txt	text/plain	3780	190	52	The use of an improperly ÿt-tested tight-ÿtting respirator may further decrease the respiratory protection level because of the additional particle penetration that occurs through the face-seal leaks (Chen et al., 1990; Chen & Willeke, 1992; Oestenstad, Dillion, & Perkins, 1990a; Oestenstad, Perkins, & Rose, 1990b) . A breathing manikin with a face-sealed respiratory mask was exposed to the airborne polydisperse surrogate aerosols that simulated viral and bacterial particles with respect to their aerodynamic size. The natural aerosol concentration in the indoor test chamber was not su cient, particularly for the measurement inside the mask, because the ÿlter removed considerable number of ambient airborne particles. The drastic decrease of the particle penetration through the respirator ÿlter due to continuous unipolar ion emission may be critical in providing additional respiratory protection by existing masks against viral and bacterial particles.	./cache/cord-340639-hdn85mik.txt	./txt/cord-340639-hdn85mik.txt