نتایج جستجو برای: noise standard

تعداد نتایج: 696617  

ژورنال: سلامت و محیط زیست 2016

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...

Journal: :The Journal of the Acoustical Society of America 1985

الهی, مهدی, بیجاری, سالار, خرمیان, داریوش, سیستانی, سروش,

Introduction: There are several techniques for reducing the delivered dose from CT scans such as the automatic exposure control (AEC). This technique regulates the tube current regarding the patient size and weight. The aim of this study was estimation the effective and equivalent dose for radiosensitive organs in women undergoing chest CT scans with or without AEC system using the patient&rsqu...

Journal: :تحقیقات نظام سلامت 0
فیروز ولی پور دانشجوی دکتری، گروه بهداشت حرفه ای، دانشکده پیراپزشکی و بهداشت، دانشگاه تربیت مدرس، تهران، ایران حبیب اله دهقان شهرضا مربی، گروه بهداشت حرفه ای، دانشکده پیراپزشکی و بهداشت، دانشگاه علوم پزشکی اصفهان، اصفهان، ایران. غلامحسین پورتقی استادیار، گروه بهداشت حرفه ای دانشکده بهداشت، دانشگاه علوم پزشکی بقیه الله (عج)، تهران، ایران. مهدی جهانگیری دانشجوی دکتری، گروه بهداشت حرفه ای، دانشکده بهداشت دانشگاه علوم پزشکی تهران، تهران، ایران. مهناز مذاهبی کارشناس ارشد، دانشگاه آزاد اسلامی، واحد تهران شمال، تهران، ایران.

background: noise is one of the harmful factors of industrial environments that may cause defect such as hearing defects, high blood pressure, irritation, sleep disturbances, increased respiratory rate and oxygen consumption. the residents and personnel working in industries around mehrabad airport continuously exposed to noise pollution caused by the traffic of passenger, war and training airp...

اعتمادی نژاد , سیاوش, علی زاده , احمد, محمدیان , محمود, یزدانی چراتی , جمشید,

Background and purpose: Noise is one of the most harmful factors in the environment. It is also one of the harsh phenomenons in this century that people are exposed to. Exposure to noise higher than threshold limit value could cause some physical and mental disorders. High traffic flow due to recent increase in number of vehicles causes higher noise pollution. There are few studies regarding ...

2001
Hui Tian Abbas El Gamal

Analysis of 1 noise in MOSFET circuits is typically performed in the frequency domain using the standard stationary 1 noise model. Recent experimental results, however, have shown that the estimates using this model can be quite inaccurate especially for switched circuits. In the case of a periodically switched transistor, measured 1 noise power spectral density (psd) was shown to be significan...

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