نتایج جستجو برای: noise level
تعداد نتایج: 1250460 فیلتر نتایج به سال:
growing demands and requires of high data rate systems cause significant increase of high frequency systems for wideband communication applications. as mixers are one of the main blocks of each receivers and its performance has great impact on receiver’s performance; in this thesis, a new solution for ku-band (12-18 ghz) mixer design in tsmc 0.18 µm is presented. this mixer has high linearity a...
Introduction: Safe driving requires the ability of the driver to receive the messages and complying with them. The most significant consequences of noise pollution are on the human auditory system. Disorders in the auditory system can have harmful side effects for human health. By reducing this kind of pollution in large cities, the quality of life, which is one of the biggest goals of the gove...
introduction: one of the major problems in the development of nuclear medicine images is the presence of noise. the noise level in nuclear medicine images is usually reduced by the analysis of imaging data in a fourier transform environment. the main drawback of this environment belongs to low signal to noise ratio in high frequencies because removing noise frequencies may remove data and times...
Introduction: Noise is one of hazardous agents of workplaces in industries. Electric industries and power plants are among industries in which noise pollution should be taken into account. This study aimed to develop and verify a statistical model for acoustic wave propagation in an indoor environment for noise related risk reduction management. . Material and Method: This theoretical-experime...
conclusions according to the factory noise map, except for the control rooms with 81 dba noise, other cases of measuring stations were higher than the standard exposure of 85 dba noise. as a result, the implementation of control strategies, such as inspection and performance of control systems and insulation of the control room to prevent unnecessary exposure noise, are necessary. background st...
Introduction: In the present study, was performed to investigate the relationship between toluene(1000 ppm), noise, toluene and toluene along with noise (frequencies 250- 2000 Hz) per auditory Brain Stem response (ABR) on rabbits in which being exposed to this contaminants. Materials & Methods: Three months old, male adult white New Zealand rabbits (1400-1700 g body weight) were used throug...
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...
Abstract Background: Previous studies have indicated an unspecific correlation between noise exposure and blood pressure disturbances. Blood pressure disturbances could be caused by the environmental hazards such as noise exposure. The aim of this study is to analyze whether there is a relationship between noise exposure and hypertension. Methods: Atotal sample of 218 workers workin...
background: formaldehyde (h2c = o), is a member of aldehyde family with a simplest organic molecule, used in various industries. the aim of this experimental study was to investigate the effects of simultaneous formaldehyde and noise exposure on hormonal pituitary-gonadal axis in adult male mice. methods: 46 adult male mice were randomly assigned to one control group and three experimental grou...
Background and aims: Noise is one of the harmful parameters of the industrial environments. It affects the human health in different aspects including harmful effects on hearing damage, vision, neurological and psychiatric, hormones, physiological and mental systems. Paying attention to the importance of hormonal effects on human body, the aim of the present study is to investigate the effects ...
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