نتایج جستجو برای: noise pollution index
تعداد نتایج: 648753 فیلتر نتایج به سال:
Noise pollution is a novel, widespread environmental force that has recently been shown to alter the behaviour and distribution of birds and other vertebrates, yet whether noise has cumulative, community-level consequences by changing critical ecological services is unknown. Herein, we examined the effects of noise pollution on pollination and seed dispersal and seedling establishment within a ...
background: in the steel industry, coke-fueled furnaces are used for smelting iron ore to produce cast iron are considered as sources of annoying noise.this study aims to evaluate the noise pollution blast furnace and sound source characteristics in order to present noise control measures in the steel industry. methods: measurement of noise level and its frequency analysis was performed using s...
acoustic experimental data of irib (islamic republic of iran broadcasting) server room was taken to measure the acoustic noise characteristics of frequency and sound pressure level (spl). the purposes of this paper are measuring the noise pollution and its evaluation through the regulations. the measurements were taken in two stages. the first one was taken at 10 points by sound investigator 22...
Background and Objectives: Sound of motorcycles plays an important role in noise pollution in big cities. This is due to the lack of national law or standards to control the noise of domestic and also imported motorcycles. This study tries to introduce a practical limit value in different stage of motorcycle life cycle by assessing their noise pollution. Materials and Methods: First the motorcy...
introduction: noise is one of the hazardous factors in work places such as textile industries. the objective of this study is to determine noise pollution in textile industries in kermanshah (2001). materials & methods: this study is an analytical-descriptive one. the study was done in 2 steps. in the first step the characteristics of the work place & buildings were completely determined; the...
background: noise is one of the most important harmful agents in work environment. noise pollution in oil refinery industries is related to workers' health. this study aimed to determine the overall noise pollution of an oil refinery operation and its frequency analysis to determine the control plan for a vent noise in these industries. methods: this experimental study performed in control unit...
the main objective of the research is to study noise pollution in khorram abad, presenting executive strategies to control or reduce it. therefore, 38 stations were selected at the region to measure the noise level round-the-clock, and the samples were also taken for a week in the middle of spring and summer, 2007. the measurements were carried out during the day (7:00 am to 10:00 pm) and night...
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...
background : cement industry has many process units. basically all of these units can be considered as a source of noise. since noise pollution is defined based on its offensive hearing effects, the importance of the noise sources depends directly on the number of workers in the unit. materials and methods : an experimental study has been done at tehran cement factory to recognize and analyze...
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