نتایج جستجو برای: noise level

تعداد نتایج: 1250460  

Journal: :health scope 0
sahand ghafori department of occupational health, faculty of medical sciences, tarbiat modares university, tehran, ir iran ali khavanin department of occupational health, faculty of medical sciences, tarbiat modares university, tehran, ir iran; department of occupational health, faculty of medical sciences, tarbiat modares university, tehran, ir iran. tel: +98-2182883564 hassan assilean department of occupational health, faculty of medical sciences, tarbiat modares university, tehran, ir iran ardalan solimanian department of occupational health, faculty of medical sciences, tarbiat modares university, tehran, ir iran

conclusions use of flexible joint in the exhaust system leads to conversion of linear vibration to non-linear one, resulting in significant reduction of noise levels. results by using this new exhaust at speed levels of 1000, 2000, 3000, 4000, and 5000 rpm, we had respectively 3.9, 6.8, 7.4, 5.6, and 5 dba decreases in total sound level pressure. objectives this study aimed to reduce motorcycle...

Journal: :international journal of occupational hygiene 0
farough mohammadian parvin nasiri omid giahi zahra rezvani mehdi kangavari athena rafieepour

original article   noise and vibration are the common problems in industrialized countries which can affect individual's job performance. the present study aimed to investigate the combination of the whole body vibration and the noise and their effects on the students' mental performance in the laboratory setting. twenty male students of tehran university of medical sciences, tehran, iran were ...

Journal: :journal of research in health sciences 0
rostam golmohammadi omid giahi mohsen aliabadi ebrahim darvishi

background: noise pollution is currently a major health risk factor for workers in industries. the aim of this study was to investigate noise pollution and implement a control intervention plan for blast furnace in a steel industry. methods: the measurement of sound pressure level (spl) along with frequency analysis was done with the sound-level-meter cell-450 . personal noise exposure was perf...

Journal: :international journal of occupational hygiene 0
amin mirzakhani industrial hygiene, hamadan university of medical sciences, hamadan, iran. mohammadreza monazzam school of public health and center for air pollution research, department of occupational health engineering, institute for environmental research, tehran university of medical sciences, tehran, iran. marzieh monazzam architecture department, kashan university, kashan, iran.

noise is one of the most common workplace hazardous agents that can cause permanent hearing damage. workers in many industries are usually exposed to noise levels with high risks of hearing loss. accordingly this research aims to study the noise exposure and haring status of registered locksmiths who are exposed to harmful effects caused by several factors, such as key making machines loud nois...

Journal: :The Journal of the Acoustical Society of America 1983

Journal: :iranian journal of nursing and midwifery research 0
azam biabanakigoortani mahboobeh namnabati zahra abdeyazdan zohreh badii

abstract background: advancements in neonatal intensive care unit (nicu) science and technology have increased the survival rate of preterm infants. despite these advances, they are still facing with neurobehavioral problems. noise level in nicu is a potential source of stress for preterm infants. it should be decreased to the standard level as much as possible. the purpose of this study was to...

Journal: :DEStech Transactions on Engineering and Technology Research 2017

Journal: :Egyptian Journal of Ear, Nose, Throat and Allied Sciences 2018

Journal: :The Journal of the Acoustical Society of America 1967

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