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A-weighted equivalent continuous noise levels for hammer and press operations in a drop-forging industry were determined using both tape recordings of the noise and personal noise dosimeters. The results indicated average A-weighted Leq values of 108 dB for hammer operators and 99 dB for press operators. Comparison of hearing level statistics for 716 hammer(More)
NIOSH conducted field investigations in 1977 and 1981 to determine the actual noise reduction afforded to industrial workers who used insert-type hearing protectors (earplugs) daily. In-situ attenuation tests of 420 workers at 15 industrial plants were conducted to determine the noise reduction provided by earplugs as they were worn during the workday. The(More)
Many of the 9 million workers exposed to average noise levels of 85 dB (A) and above are required to wear hearing protection devices, and many of these workers have already developed noise-induced hearing impairments. There is some evidence in the literature that hearing-impaired users may not receive as much attenuation from hearing protectors as(More)
After a single exposure to s t r e s s (tying down abdomen uppermost for 1 h) the response of an increase in the total unconjugated l l hyd roxyco r t i cos t e ro id s in the per ipheral blood observed in intact animals was inhibited in rats with toxic hepatitis. This inhibition was evidently due to an increase in the initial level of l l -hydroxycor t i(More)