Aerospace engines testing is a source of noise pollution and determining the low frequency acoustic characteristics of the test cell, plays an important role in optimally control of the sound field and reducing the level of sound pressure and pollution. In this study, the drop in average sound pressure level is numerically predicted by constructing a test cell according to ISO 140 standard. To ...

Introduction & Objective: Noise is one of the most important harmful agents in work environment. In spit of industrial improvements, exposure with over permissible limit of noise is counted as one of the health complication of workers. In Iran, do not exact information of the absorption coefficient of acoustic materials. Iranian manufacturer have not laboratory for measured of sound absorbanc...

Hamadan nursery school which 1196 people young than 5 years old were assessed by octoscopic examinations tympanometery test and acoustic reflexes for two stages. The first stage of assessment was done in nursery school and doubted babies who were suffering of I.M.E.D. after two or three weeks, they were referred to audioly department of Imam Khoemini hospital in order to specialized assessmen...

  Abstract   Background and aims: Occupational noise is a major cause of hearing loss and tinnitus. In the present study, acoustic characteristics of tinnitus were evaluated and their relation with hearing loss and nervousness was studied.   Methods: Our study was performed on 56 male workers aged between 40 to 56 years including 28 workers with accompanied hearing loss and tinnitus and a long ...

Introduction: Noise pollution cause mental fatigue, concentration disturbance and learning loss in students during the training activities. This study aims to evaluate Noise pollution and the level of acoustical comfort in typical classrooms, and present treatment methods for improving acoustic comfort. Method: In cross sectional study, twenty classrooms in the seven faculty of Hamadan Univers...

Background & Aim: Acute acoustic trauma is an important cause of sensorineural hearing loss (SNHL). Determination of the frequency and contributing factors for vestibular disorders is important, therefore, the current study was performed to assess these factors in patients referred to the ears, nose, and throat (ENT) clinic of one of the hospitals in Tehran, Iran, during the years 2017 to 2019....