نتایج جستجو برای: equivalent sound level

تعداد نتایج: 1290264  

2014
PARVIN NASSIRI HAMID REZA HEIDARI MONIREH KHADEM HODA RAHIMIFARD

Noise is a common and widespread problem in workplaces. Noise can lead to hearing loss, hypertension, nervous and mental disorders, annoyance and stress, sleep disturbance, negative impact on productivity and working capacity. The undesirable effects of noise on an individual or group are called annoyance. Some personal and social characteristics can affect on annoyance. This study was aimed to...

Background & Aims: In addition to the adverse effects of noise in the auditory system, non-auditory effects can be regarded as factors which cause physiological harassment, discomfort and also disorder in cognitive functions. The present study aimed at determining cognitive function after exposuring to different levels of sound pressure level in a clinical trial study. Materials & Metho...

ژورنال: سلامت کار ایران 2014

  Background and aims: In the steel industry, air blowers used to supply compressed air are considered as sources of annoying noise . This study aims to design an acoustic room chamber in order to control the noise level of the air blower.   Methods: Measuring of the noise level along with frequency analysis was performed by using sound level meter, model ofCASELLA-Cell.450 . Dosimetery was per...

2015
Javier Esparza Jörg Desel

We introduce a global specification language for distributed negotiations, a recently introduced concurrent computation model with atomic negotiations combining synchronization of participants and choice as primitive. A token game on distributed negotiations determines reachable markings which enable possible next atomic negotiations. In a deterministic distributed negotiation, each participant...

Journal: :تحقیقات نظام سلامت 0
رستم گلمحمدی دانشیار گروه مهندسی بهداشت حرفه‎ای، دانشکده بهداشت و مرکز تحقیقات علوم بهداشتی، دانشگاه علوم پزشکی همدان، همدان، ایران محسن علی آبادی ستادیار گروه مهندسی بهداشت حرفه‎ای، دانشکده بهداشت، دانشگاه علوم پزشکی و خدمات بهداشتی درمانی همدان، همدان، ایران ابراهیم درویشی عضو مرکز تحقیقات بهداشت محیط و مربی گروه مهندسی بهداشت حرفه‎ای، دانشکده بهداشت، دانشگاه علوم پزشکی و خدمات بهداشتی درمانی کردستان، سنندج، ایران

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...

Porous materials have good acoustic damping characteristics over a wide frequency range. As for sound waves, many small-scale pores in the coating materials can convert underwater-coating to rough surfaces. The main property of porous absorbents is their resistance against incident sound wave that leads to damping effect. From a physical point of view, damping occurs due to friction between flu...

ژورنال: طب کار 2015

Aims: Noise is considered the most harmful physical agents in the workplace which exposure to it can cause the harmful physical and psychological effects on worker. Since the best noise control measures is to reduce or limit the at the source, the purpose of this study was to assess the noise pollution and determine the dominant sound source in an Air production plant of a Petrochemical industr...

Journal: :Brazilian journal of otorhinolaryngology 2014
Izabella dos Santos Maria Francisca Colella-Santos Christiane Marques do Couto

INTRODUCTION The use of Personal Digital Audio Players can cause hearing injuries, as the sound is generated directly in the ear canal. It is believed that different types of headphones can cause different amplifications, since they cause changes in the volume and resonance of the ear canal according to their depth. OBJECTIVE This study aimed to determine the sound pressure to which young ind...

Journal: :Journal of the Acoustical Society of Japan (E) 1987

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