نتایج جستجو برای: equivalent sound level

تعداد نتایج: 1290264  

Journal: :The Journal of the Acoustical Society of America 1952

Journal: :journal of research in health sciences 0
mohammad reza monazzam-esmaeelpour zahra hashemi rostam golmohammadi narges zaredar

background: noise pollution is currently a major risk factor in industries in both developed and developing countries . the present study assessed noise pollution in the knitting industry in iran in 2009 and presented a control method to reduce the rate of noise generation. methods: the overall noise level was estimated using the network environmental noise assessment method in sina poud textil...

Journal: :Journal of Education for International Understanding 2019

2017
Rouzbeh Amini Hamed Mojallali Roozbeh Izadi-Zamanabadi Jan Helbo

In this paper, measurements of admittance magnitude and phase are used to identify the complex values of equivalent circuit model for free stator of an ultrasonic motor. The model is used to evaluate the changes in the admittance and relative changes in the values of equivalent circuit elements. This method identifies the damages and categorizes them. The validity of the method is verified by u...

Journal: :journal of research in health sciences 0
rostam golmohammadi mohammad reza monazzam maryam nourollahi ali nezafat samaneh momen bellah fard

background: the adverse effects of noise are well known and noise problems due to industrialization of communities are increasing over the time. oil industries due to the process and nature of production; contain many noise sources such as compressors, turbines, and pumps, which cause excessive noise exposure. the objective of this study was to evaluate the noise characteristics of compressors ...

احمدی آسور, اکبر, نوری, کرامت الله, گلبابایی, فریده, نصیری, پروین ,

This study has been carried out in two shoe-making factories in Tehran with the aim ofevaluating the cobined effects of noise and toluene on the workers' hearing. Sixty four workers were assigned to three groups according to their exposure to noise andtoluene. 33 were exposed to noise (group 0), 5 to toluene (group 1) and 26 to noise andtoluene (group 2).The concentration were measured in the ...

Journal: :Journal of caring sciences 2013
Sousan Valizadeh Mohammad Bagher Hosseini Nasrinsadat Alavi Malihe Asadollahi Siamak Kashefimehr

INTRODUCTION High levels of sound have several negative effects, such as noise-induced hearing loss and delayed growth and development, on premature infants in neonatal intensive care units (NICUs). In order to reduce sound levels, they should first be measured. This study was performed to assess sound levels and determine sources of noise in the NICU of Alzahra Teaching Hospital (Tabriz, Iran)...

Background: The noise caused by traffic is an increasingly prominent feature of urban environments. However, limited studies have been focused on the assessment of exposure-response relationship between road traffic noise exposure and driving behaviors in Iran. The present study aimed to investigate the prevalence of the violations caused by road traffic noise exposure in Qazvin, Iran. Methods...

Journal: :The Journal of the Acoustical Society of America 2017

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