نتایج جستجو برای: sound pressure level spl
تعداد نتایج: 1532719 فیلتر نتایج به سال:
When developing new vehicles that are to be operated in existing background noise, such as electric vertical take-off and landing aircraft (eVTOLs) cities, a sound design goal should minimize the loudness given noise. Rotorcraft sounds characterised by their pulses, choice of rotor size number allows vary temporal characteristics. We asked participants compare pulse trains with durations 1, 2, ...
OBJECTIVE To explore aerodynamic, acoustic, and laryngeal changes surrounding opera performance. STUDY DESIGN Prospective preperformance, postperformance, and day after performance. METHODS The laryngeal and vocal function of five male and five female classically trained singers was assessed immediately before, immediately after, and 1 day after an actual operatic performance. Phonatory thr...
The protection of human rights and just welfare are Indonesia's orientation as a rule law country. In line with developments civilization, parade activities that should show our customary wealth cultural identity beginning to be eroded by sound system parades which tend cause social problems in society, conflicts even physical damage health caused the loud powerful system. purpose this study is...
Introduction: In the most industrial environment, workers are exposed to noise everyday. Exposure to this physical hazardous agent can cause immediate as well as delayed adverse effects. Cognitive performance decrement is one of the adverse effects of noise exposure which its main consequences is occupational accidents. This study attempted examine the effect of exposure to different levels of ...
SUMMARY Through analysis of earlier research and some recent on-road testing it is demonstrated that, with adequate precaution, accurate measurement of tire/pavement noise using on-board sound intensity (SI) can be accomplished with two intensity probes oriented vertically. As in the single probe method, SI is measured in the airflow alongside of a vehicle at locations opposite the leading and ...
Although northern bottlenose whales were the most heavily hunted beaked whale, we have little information about this species in its remote habitat of the North Atlantic Ocean. Underwater anthropogenic noise and disruption of their natural habitat may be major threats, given the sensitivity of other beaked whales to such noise disturbance. We attached dataloggers to 13 northern bottlenose whales...
To discriminate between broadband noises with and without a high-frequency spectral notch is more difficult at 70-80 dB sound pressure level than at lower or higher levels [Alves-Pinto, A. and Lopez-Poveda, E. A. (2005). "Detection of high-frequency spectral notches as a function of level," J. Acoust. Soc. Am. 118, 2458-2469]. One possible explanation is that the notch is less clearly represent...
Although protective effects of the cochlea's efferent feedback pathways have been well documented, prior work has focused on hair cell damage and cochlear threshold elevation and, correspondingly, on the high sound pressure levels (>100 dB SPL) necessary to produce them. Here we explore the noise-induced loss of cochlear neurons that occurs with lower-intensity exposures and in the absence of p...
We proposed a method for patient selection and application of criteria for predicting success with bone-conduction external acoustic stimulation using high-audio-frequency sound in the ranges of 10-20 kHz and 20-26 kHz for individuals with subjective idiopathic tinnitus (SIT) of the severe disabling type. Ultra-high-frequency (UHF) stimulation for tinnitus relief has been found to be most effec...
Background and Objectives: Noise pollution is one of the most harmful physical factors in working environments in developed and developing countries, which has significant impacts on the workers’ quality of life. The aim of this study was to investigate mental and physiological effects of chronic exposure to noise. Methods: This is a cross-sectional study carried out randomly in 2018 on 250 wo...
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