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Cloueuses portatives - Développement de méthodes de diagnostic vibratoire et acoustique
Le fonctionnement des cloueuses portatives étant basé sur un processus d'impact visant à enfoncer un clou, l'utilisation de ces outils expose les travailleurs à des bruits et à des vibrations à caractère impulsionnel, en générant des niveaux très élevés pendant un très court laps de temps. Par ailleurs, l'exposition aux bruits et aux vibrations impulsionnels engendre un risque de développer des maladies professionnelles. Des échanges avec l'Association paritaire pour la santé...
Noise peaks influence communication in the operating room
An observational study Noise peaks are powerful distractors. This study focuses on the impact of noise peaks on surgical teams' communication during 109 long abdominal surgeries. We related measured noise peaks during 5-min intervals to the amount of observed communication during the same interval. Results show that noise peaks are associated with less case-relevant communication; this effect is moderated by the level of surgical experience; case-relevant communications decrease under high noise peak conditions among junior, but not among senior surgeons. However, case-irrelevant communication...
Méthodes de simulation temporelles pour résoudre des problématiques de bruit et vibrations
Revue de la littérature Le présent projet a consisté à faire une étude bibliographique des outils de modélisation temporelle et à documenter leurs applications en santé et en sécurité du travail, plus spécifiquement dans la réduction des bruits et des vibrations impulsionnelles transitoires ou non linéaires. La revue de la littérature a couvert près de deux cents documents. Source : http://www.irsst.qc.ca/-publication-irsst-simulation-temporelles-bruit-vibrations-r-806.html
Effect of noise and redundant auditory alarm signal on semiconductor production operators' response to machine downtime
This paper investigates the effect of noise and the effect of a redundant impulsive auditory alarm signal on production operators' response to machine downtime in a semiconductor manufacturing system. Machine uptime is essential for productive and efficient production system and therefore downtime calls for an immediate response. Given a higher machine-to-man ratio, there is a difficulty in achieving quick response to machine downtime. For this end, ergonomic tower lamps with visual and auditory displays are used in most semiconductor manufacturing system to alert production operators and therefore...
The ANSI S12.42 methods proposed by EPA’s provide consistent and reproducible results
This study tests the ANSI S12.42 methods with a range of hearing protection devices measured in field conditions. The average IPILs (impulse peak insertion loss) increased with peak pressure and ranged between 20 and 38 dB. For some protectors, significant differences were observed across protector examples of the same model, and across insertions. The EPA's (U.S. Environmental Protection Agency) proposed methods provide consistent and reproducible results. The proposed impulse NRR (noise reduction rating) rating should utilize the minimum and maximum protection percentiles as determined by...
Dental personnel in Thailand are exposed to noise intensities lower than occupational exposure limits.
This cross-sectional study was performed in the Dental School of Prince of Songkla University to ascertain noise exposure of dentists, dental assistants, and laboratory technicians. The peaks of the noise spectrum of dental instruments were at 1,000, 4,000, and 8,000 Hz which depended on the type of instrument. Noise measurement in the personal hearing zone found that the laboratory technicians were exposed to the highest impulsive noise levels (137.1 dBC). The dentists and dental assistants who worked at a pedodontic clinic had the highest percent noise dose (4.60 ± 3.59%). In the working...
A bit isolator and a chuck isolator reduce the noise radiated by the drill steel and chuck
Among underground coal miners, hearing loss remains one of the most common occupational illnesses. In response to this problem, the National Institute for Occupational Safety and Health (NIOSH) Office of Mine Safety and Health Research (OMSHR) conducts research to reduce the noise emission of underground coal-mining equipment, an example of which is a roof bolting machine. Field studies show that, on average, drilling noise is the most significant contributor to a roof bolting machine operator’s noise exposure. NIOSH OMSHR has determined that the drill steel and chuck are the dominant sources...
Relatively high intelligibility scores are possible with an in-ear integrated hearing protection communications device.
Integrated hearing protection systems are designed to enhance free field and radio communications during military operations while protecting against the damaging effects of high-level noise exposure. A study was conducted to compare the effect of increasing the radio volume on the intelligibility of speech over the radios of two candidate systems, in-ear and muff-style, in 85-dBA speech babble noise presented free field. At the highest volume, subjects achieved 79% with the in-ear device but only 69% with the muff-style device, averaged across the gender of listener/talker pairs and consonant...
Using a Starter Pistol, generates 166dB impulse noise (peak )at 0.5m
At the shooters ear a blocked barrel .22 caliber Starter Pistol produces significantly higher sound pressure levels (7-18dB) than a comparable .22 caliber pistol, regardless of ammunition. Use of hearing protection is required for shooter. Closest athletes and potentially some spectators are at risk according to current NIOSH and WHO sound exposure guidelines. Using a Starter Pistol, which generates 166dB at 0.5m, the shooter will have to be 256 meters(!!) or ~280 yards away from the athletes to adhere to Electronic Starter requirements. Starter Pistols and/or Blanks are used for high school, university...
Pneumatic nail guns produce loud “impulse” noise peaks in a range from 109 to 136 dBA.
Pneumatic nail guns produce short (less than a tenth of a second in du­ration) but loud “impulse” noise peaks: one from driving the nail and one from exhausting the air. Most nail gun manufacturers recommend that users wear hearing protection when operating a nailer. Available information indicates that nail gun noise can vary depending on the gun, the work piece, air pressure, and the work setting. The type of trigger system does not appear to affect the noise level. Peak noise emission levels for several nailers ranged from 109 to 136 dBA. These loud short bursts can contribute...
L’indicateur tardif audio-sonométrique (ITAS) permet de suivre la perte auditive de groupes de travailleurs exposés à des bruits impulsifs.
Ce modèle exponentiel considère qu’une exposition quotidienne à des bruits impulsifs est plus nocive pour l’audition que celle à un bruit continu. En effet, certains bruits impulsifs peuvent causer des dommages irréversibles instantanément et un facteur de correction doit être ajouté au niveau moyen mesuré. L’indicateur s’applique au suivi audiologique de travailleurs dans la cinquantaine et tient compte, entre autres, des résultats du groupe (HEG, Homogeneous Exposure Groups). Une surveillance audiométrique...
Elevated prevalence values of tinnitus, sensitivity to noise and hearing impairment are found at discharge compared to before military service.
Data from the 2010 Annual Social and Economic Supplement (ASEC) were analyzed. The prevalence of SHI among veterans was significantly greater than among nonveterans. Veterans were 30% more likely to have SHI than nonveterans after adjusting for age and current occupation. These findings suggest a need for increased emphasis on improving military hearing conservation programs (HCPs) and on hearing loss surveillance in military and veterans' health systems. Source: Severe Hearing Impairment Among Military Veterans --- United States 2010 , Matthew R. Groenewold, PhD, Sangwoo Tak, ScD, Elizabeth...
Preventing Occupational Exposures to Lead and Noise at Indoor Firing Ranges
The National Institute for Occupational Safety and Health (NIOSH) requests help in preventing injury and illness in workers at indoor firing ranges in the United States. Workers are potentially exposed to hazardous amounts of lead and noise at these ranges. They include thousands of employees at the firing ranges as well as more than a million Federal, State, and local law officers who train regularly at these facilities. In addition to workers, 20 million active target shooters are potentially exposed to lead and noise hazards at indoor firing ranges. http://www.cdc.gov/niosh/docs/2009-136/

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