نتایج جستجو برای: noise level
تعداد نتایج: 1250460 فیلتر نتایج به سال:
Noise traders as one of the key elements of the market play a significant role in determining the market volatilities, returns, and stock market mispricing. Hence, this study attempts to scrutinize the role of noise trading in capital asset pricing. Therefore, by using daily data, samples including 14105 data of 200 companies listed on stock exchange were selected and noise trading index was es...
background and objectives: noise pollution has a high prevalence among the environmental pollutions and is considered as a teratogenic agent for reproductive system. this study was performed with the purpose of evaluation of the effect of honey and vitamin e on sex hormone levels in male rats exposed to noise pollution. methods: twenty-four adult male rats with the mean weight of 200±20g were r...
Introduction: In some jobs, physical activity can be done in high noise pollution that can affect the heart rate. The aim of this study was to investigate the effects of noise exposure and physical activity on heart rate in the hot and humid conditions. Materials and Methods: This experimental study was performed on 14 healthy men in hot and humid climatic chamber (35 °C, 75% RH). ...
background noise exposure is known as a risk factor for hearing loss and one of its effects is noise-induced stress. cortisol as a stress hormone is used in noise-induced stress assessments. objectives the aim of this study was to measure and compare saliva cortisol concentrations in the morning and evening in normal work day and rest day in both case and control groups and to assess the associ...
Abstract: Background and aims: Using water pump in residential buildings to provide the required water pressure is accompanied by noise pollution and the annoyance of residents. So, the purpose of this study is to reduce water pump noise pollution with designed acoustic curtains in a residential building of Qazvin city. Methods: The mean sound pressure level was measured before and ...
original article introduction: wind-turbine noise emission and its environmental impact are considerable issues nowadays. considering the importance of the issue, the purpose of this study was to prepare noise map and wind turbines sound characteristics on the largest wind farm of iran. method: this study was carried out in two phases:1) in order to prepare the daytime sound level (ld) noise ...
background: in neonatal intensive care units (nicu) different sound intensities and frequencies are produced from different sources, which may exert undesirable physiological effects on the infants. the aim of this study was to determine the noise level and its sources in the nicu and neonatal ward of al-zahra hospital of rasht, iran. methods: in this descriptive cross-sectional study, the inte...
Sound is an effective exogenous factors which affecting human brain processing mechanisms. This research was quasi experimental study that was carried out among 70 students to evaluate the effect of sound frequency on human noise annoyance. Noise annoyance degree was measured during exposure to sound at various frequencies of 500, 1000, 2000, 4000 and 8000 Hz. Sound.exe software was used to det...
Background and Objective: The aim of noise control in a community is to improve its management in the community, because the traffic noise can affect neighboring residential areas. Well-planned noise management can eliminate this major and harmful component issue, which is one of the stresses of urban life on human health. However, before planning to decrease urban noise, it is necessary to de...
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