نتایج جستجو برای: sound pressure level spl

تعداد نتایج: 1532719  

Journal: :The Journal of experimental biology 2005
David G Zeddies Richard R Fay

Zebrafish (Danio rerio) were placed in small wells that could be driven vertically with a series of calibrated sinusoids. Video images of the fish were obtained and analyzed to determine the levels and frequencies at which the fish responded to the stimulus tones. It was found that fish 4 days post fertilization (dpf) did not respond to the stimulus tones, whereas fish 5 dpf to adult did respon...

Journal: :International journal of occupational safety and ergonomics : JOSE 2011
Emil Kozłowski Jan Zera Rafał Młyński

In this study, change in A-weighted and 1/3 octave sound pressure levels (SPLs) was used to assess the influence of wearing earplugs by musicians on their musical performances. Seven soloists and 3 music assembles performed 4 pieces of music with musician's earplugs donned and doffed. They used silicon custom moulded earplugs with acoustic filters designed to attenuate sound by 9, 15 or 25 dB. ...

ژورنال: سلامت کار ایران 2018

Abstract: Background and aims: Using water pump in residential buildings to provide the required water pressure is accompanied by noise pollution and the annoyance of residents. So, the purpose of this study is to reduce water pump noise pollution with designed acoustic curtains in a residential building of Qazvin city.   Methods: The mean sound pressure level was measured before and ...

Journal: :Ear and hearing 2010
Sienna R Burke Abigail R Rogers Stephen T Neely Judy G Kopun Hongyang Tan Michael P Gorga

OBJECTIVE Calibration errors in distortion-product otoacoustic emission (DPOAE) measurements because of standing waves cause unpredictable changes in stimulus and DPOAE response level. The purpose of this study was to assess the extent to which these errors affect DPOAE test performance. Standard calibration procedures use sound pressure level (SPL) to determine specified levels. Forward pressu...

Background: Noise pollution is one of the common physical harmful factors in many work environments. The current study aimed to assess the personal and environmental noise level and project the sound map of an Iranian tire manufacturing complex using Surfer V.14 and Noise At Work tools. Materials and Methods: This descriptive study was conducted in the curing hall [including curing, sandblast,...

2012
Haruka Tamura Nobutaka Ohgami Ichiro Yajima Machiko Iida Kyoko Ohgami Noriko Fujii Hiroyuki Itabe Tastuya Kusudo Hitoshi Yamashita Masashi Kato

We are routinely exposed to low frequency noise (LFN; below 0.5 kHz) at moderate levels of 60-70 dB sound pressure level (SPL) generated from various sources in occupational and daily environments. LFN has been reported to affect balance in humans. However, there is limited information about the influence of chronic exposure to LFN at moderate levels for balance. In this study, we investigated ...

Background & Aims: In addition to the adverse effects of noise in the auditory system, non-auditory effects can be regarded as factors which cause physiological harassment, discomfort and also disorder in cognitive functions. The present study aimed at determining cognitive function after exposuring to different levels of sound pressure level in a clinical trial study. Materials & Metho...

Journal: :Hypertension 2008
Andrey C da Costa-Goncalves Jens Tank Ralph Plehm Andre Diedrich Mihail Todiras Maik Gollasch Arnd Heuser Maren Wellner Michael Bader Jens Jordan Friedrich C Luft Volkmar Gross

Spinophilin controls intensity/duration of G protein-coupled receptor signaling and thereby influences synaptic activity. We hypothesize that spinophilin affects blood pressure through central mechanisms. We measured blood pressure and heart rate in SPL-deficient (SPL(-/-)), heterozygous SPL-deficient (SPL(+/-)), and wild-type (SPL(+/+)) mice by telemetry combined with fast Fourier transformati...

2013
Friedrich Ladich Tanja Schulz-Mirbach

BACKGROUND Hearing thresholds of fishes are typically acquired under laboratory conditions. This does not reflect the situation in natural habitats, where ambient noise may mask their hearing sensitivities. In the current study we investigate hearing in terms of sound pressure (SPL) and particle acceleration levels (PAL) of two cichlid species within the naturally occurring range of noise level...

Journal: :The Journal of neuroscience : the official journal of the Society for Neuroscience 2009
Bo Wen Grace I Wang Isabel Dean Bertrand Delgutte

The auditory system operates over a vast range of sound pressure levels (100-120 dB) with nearly constant discrimination ability across most of the range, well exceeding the dynamic range of most auditory neurons (20-40 dB). Dean et al. (2005) have reported that the dynamic range of midbrain auditory neurons adapts to the distribution of sound levels in a continuous, dynamic stimulus by shiftin...

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