摘要 :
This report describes a telephone survey of the intermediate term effects of aircraft overflights on visitors to 12 Forest Service wildernesses. Twelve Forest Service wildernesses were purposively selected for study on the basis o...
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This report describes a telephone survey of the intermediate term effects of aircraft overflights on visitors to 12 Forest Service wildernesses. Twelve Forest Service wildernesses were purposively selected for study on the basis of two primary and five secondary criteria. The primary criteria were levels of visitor use and aircraft overflight exposure. Wildernesses were also selected to provide a range of ambient sound levels, ecotypes, visitor activities, day and overnight use, and exposure to helicopters as well as fixed wing aircraft. The reported annoyance (in any degree) due to aircraft noise in all wildernesses ranged from 5% to 32%. The prevalence of high annoyance was less than 5% in all wildernesses combined. Further, it was found that visitors' overall enjoyment of wildernesses and their intentions to return were not affected by aircraft overflights.
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摘要 :
This report examines the feasibility of conducting epidemiologic studies that would support inferences about effects of residential exposure to aircraft noise on nonauditory health. The type of aircraft noise of particular interes...
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This report examines the feasibility of conducting epidemiologic studies that would support inferences about effects of residential exposure to aircraft noise on nonauditory health. The type of aircraft noise of particular interest is that associated with supersonic and low altitude, high speed flight in Military Operating Areas (MOAs) and Military Training Routes (MTRs): both sonic booms and high peak level, rapid onset time subsonic noise. Potential studies considered are those with observational designs that are community-based or derived from audiometric databases. Since the primary goal of such studies is to improve the Air Force's ability to predict the effects of nonauditory health of noise exposure near MOAs and MTRs, such studies must provide: a demonstration of a causal chain from aircraft noise exposure to nonauditory adverse health consequences; and a reliable quantitative relationship between amount of noise exposure (dose) and degree of specific health consequences (effect). Keywords: Jet engine noise; Epidemiology; Annoyance; Community response; Noise; Health effects; Psychoacoustics; Dose-response relationships. (edc)
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摘要 :
This report examines the feasibility of conducting epidemiologic studies that would support inferences about effects of residential exposure to aircraft noise on nonauditory health. The type of aircraft noise of particular interes...
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This report examines the feasibility of conducting epidemiologic studies that would support inferences about effects of residential exposure to aircraft noise on nonauditory health. The type of aircraft noise of particular interest is that associated with supersonic and low altitude, high speed flight in Military Operating Areas (MOAs) and Military Training Routes (MTRs): both sonic booms and high peak level, rapid onset time subsonic noise. Potential studies considered are those with observation designs that are community-based or derived from audiometric databases. Since the primary goal of such studies is to improve Air Force's ability to predict the effects on nonauditory health of noise exposure near MOAs and MTRs, such studies must provide: a demonstration of a causal chain from aircraft noise exposure to nonauditory adverse health consequences; and a reliable quantitative relationship between amount of noise exposure (dose) and degree of specific health consequences (effect). Keywords: Epidemiology; Aircraft noise; Annoyance; Community response; Psychoacoustics; Dose-response relationships. (aw)
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摘要 :
This reports examines the feasibility of conducting epidemiologic studies that would support inferences about effects of residential exposure to aircraft noise on nonauditory health. The type of aircraft noise of particular intere...
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This reports examines the feasibility of conducting epidemiologic studies that would support inferences about effects of residential exposure to aircraft noise on nonauditory health. The type of aircraft noise of particular interest is that associated with supersonic and low altitude, high speed flight in Military Operating Areas (MOAs) and Military Training Routes (MTRs): both sonic booms and high peak level, rapid onset time subsonic noise. Potential studies considered are those with observational designs that are community based or derived from audiometric databases. Since the primary goal of such studies is to improve the Air Force's ability to predict the effects on nonauditory health of noise exposure near MOAs and MTRs, such studies must provide: a demonstration of a causal chain from aircraft noise exposure to nonauditory adverse health consequences; and a reliable quantitative relationship between amount of noise exposure (dose) and degree of specific health consequences (effect). Keywords: Epidemiology; Aircraft noise; Annoyance; Community response; Noise; Health effects; Psychoacoustics; Dose-response relationships. (EG)
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摘要 :
Concern for predicting aural detectability of complex natural sounds has generally focused on steady state tonal and broadband signals. Procedures for calculating detectability of such signals are reasonably well established and v...
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Concern for predicting aural detectability of complex natural sounds has generally focused on steady state tonal and broadband signals. Procedures for calculating detectability of such signals are reasonably well established and validated. Large errors of prediction may occur, however, when these procedures are applied to other classes of signals, such as high crest factor, short duration, impulsive wavetrains. The experimentation described here was intended to support analyses of detection performance that could lead to general quantitative procedures for predicting the audibility of repetitive, periodic impulsive signals. Three separate studies were conducted using similar procedures. The first study quantified the detectability of individual impulses. The second study was directed toward the detectability of multiple impulses of varying periodic repetition rates. The third study explored hypotheses about detection strategies suitable for modelling the audibility of repetitive impulsive wavetrains.
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