STUDY OBJECTIVE Traffic noise disturbs sleep and may impair recuperation. There is limited information on single and combined effects of air, road, and rail traffic noise on sleep and recuperation. DESIGN Repeated measures. SETTING Polysomnographic laboratory study. PARTICIPANTS 72 healthy subjects, mean ± standard deviation 40 ± 13 years, range 18-71 years, 32 male. INTERVENTIONS Expos...

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...

An important problem in systems such as aerospace interiors, automobile passenger compartments and other cavities is the control of low frequency interior noise. Active control of this noise may offer a potentially better alternative to passive control due to constraints of weight and space. Active structural-acoustic control (ASAC) is considered as an attractive strategy especially for control...

Duct noise control is an important practical problem. This paper explores the vibro-acoustic mechanism of duct through membrane in tandem. Validity and feasibility proposed analytical model demonstrated by comparing existing simplified models full direct aeroacoustic simulation solved with CE/SE model. It shown that coupling effect between two membranes tandem not negligible to predict system r...

In the current study, numerical analysis of passive control flow with a rod for Ahmed body is performed at different slant angles and velocities placed locations on surface. The aim study to improve aerodynamic performance by preventing separation surface using rod. This method uses that has not been applied simplified ground vehicles before. Therefore, it can be said this new example in point ...

noise is considered as one of the harmful factors at industrial environments. it affects human health in different aspects including harmful influences on auditory, vision, neurological and psychiatric systems, hormones, physiological and mental systems. paying attention to the importance of hormonal effects on human body seems to possess crucial importance. the aim of the present study is to i...

Low contrast images, suffering from a lack of sharpness, are easily influenced by noise. As a result, many local false peaks may be generated in contrast measurements, making it difficult for the camera's passive auto-focus system to perform its function of locating the focused peak. In this paper, a new passive auto-focus algorithm is proposed to address this problem. First, a noise reduction ...

Passive acoustic detection is being increasingly used to monitor visually cryptic cetaceans such as Blainville's beaked whales (Mesoplodon densirostris) that may be especially sensitive to underwater sound. The efficacy of passive acoustic detection is traditionally characterized by the probability of detecting the animal's sound emissions as a function of signal-to-noise ratio. The probability...