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Evaluation of Individual and Environmental Sound Pressure Level and Drawing Noise-Isosonic Maps Using Surfer V.14 and Noise at Work V.5.0

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Sound & Vibration 2021年第2期55卷 163-171页

作者： Sajad Zare rasoul hemmatjo Hossein ElahiShirvan Ashkan Jafari Malekabad Mansour Ziaei Farshad Nadri Department of Occupational Health School of Public HealthKerman University of Medical SciencesKermanIran Department of Occupational Health School of Public HealthUrmia University of Medical SciencesUrmiaIra Student Research Committee Kerman University of Medical SciencesKermanIran Department of Occupational Health School of Public HealthBushehr University of Medical SciencesBushehrIran Department of Occupational Health School of Public HealthKermanshah University of Medical SciencesKermanshahIran

Noise pollution is one of the common physical harmful factors in many work *** current study aimed to assess personal and environmental sound pressure level and project the sound-Isosonic map in one of the Razavi Khorasan Paste manufacture using Surfer V.14 and Noise at work *** cross-sectional,descrip-tive study is analytical that was conducted in 2018 in the Paste factory that contains Canister,production and Brewing *** ISO 9612:2009,Casella Cel-320 was used to measure personal sound pressure level,while CEL-450 sound level meter(manufactured by Casella-Cel,the UK)was employed to assess environmental sound pressure *** analyzes was done using SPSS V.18 and Linear Regression *** sound-isosonic maps were projected using Surfer V.14 and Noise at work *** results of assessing personal sound pressure level indicated that the highest received dose(172.21%)and personal equivalent sound level(87.36 dBA)were recorded for workers in the Canister *** to results of measuring of the environmental sound pressure level,out of 16 measurement stations in this unit,overall 87.5%were regarded as danger and caution *** lowest and highest sound pressure levels in this units were 61 dBA and 92 dBA that belong to Brewing and Canister units *** indicate Over 75%of the Canister and production units had a sound pressure level greater than 85 dBA and these two units were regarded as the most dangerous area in terms of noise *** is there-fore necessary to implement noise control measures,apply hearing protection program and auditory tests among workers in these units.

关键词： Sound pressure level personal sound environmental sound sound map isosonic map surfer noise at work

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Presenting a Signal to Noise Ratio Model Based on the Combined Effect ofSound Pressure Level/frequency, Exposure Time and Oral Potassium:Experimental Study in Rats

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Sound & Vibration 2020年第1期54卷 17-25页

作者： Parvin Nassiri Sajad Zare Mohammad Reza Monazzam Akram Pourbakht rasoul hemmatjo Hossein ElahiShirvan Department of Occupational Health School of Public HealthTehran University of Medical SciencesTehranIran Student Research Committee Kerman University of Medical ScienceKermanIran Department of Audiology School of RehabilitationIran University of Medical SciencesTehranIran Department of Occupational Health School of Public HealthUrmia University of Medical SciencesUrmiaIran

Exposure to noise can lead to anatomical,nonauditory,and auditory *** auditory influence of noise exposure is manifested in the form of Noise-induced hearing loss(NIHL).The current study aimed at present a signal to noise ratio model of otoacoustic emission of rats’ears in the light of the combined effect of sound pressure level,sound frequency,exposure time,and potassium concentration of the used *** total,36 adult male rates,whose age varied from 3 to 4 months and had a weight of 200±50 g,were randomly divided into 12 groups,with each group consisting of 3 *** rats in both groups(case and control groups)were exposed to SPLs of 85,95,and 105 dB,emitted from sources that generated white noise.A distortion product otoacoustic emission(DPOAE)machine(4000 I/O manufactured by Homoth of Germany)was utilized to gauge the signal to noise ratio(SNR)of otoacoustic emissions of rats’ears at various frequencies in an acoustic *** inclusion criterion was SNR≥6 *** collected data were fed into the Statistical Package for Social Sciences(SPSS)version 18,followed by conducting descriptive and inferential data analysis *** results of SNR analysis indicated that over 82%of all data had SNRs that were equal to or greater than 6 *** data were considered as acceptable ***,SPL and sound frequency had significant associations with SNR(P<0.0001).Exposure time also significantly correlated with SNR(P=0.008).However,the potassium concentration of the used water had no significant correlation with SNR(P=0.97).High sound pressure levels result in lower ***,higher frequency leads to higher *** the contrary,longer exposure time reduces ***,the potassium concentration of the used water has no effect on SNR.

关键词： Noise sound pressure level potassium DPOAE rat

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