نتایج جستجو برای: air filtration

تعداد نتایج: 242582  

2009
Lars E. Ekberg Bingbing Shi

The fractional filtration efficiency for particles ranging from 5 nm to 100 nm was estimated based on previous publications. The downstream concentration and size distribution was calculated for each of four outdoor aerosols representing both urban and rural conditions. When interpreting data expressed as the total number concentration (dp>5 nm), the studied F7filter (corresponding roughly to M...

Journal: :International Journal of Environmental Science and Technology 2021

Polyacrylonitrile (PAN) nanofiber membranes of varied thicknesses (20–100 µm) were electrospun at a polymer concentration 14% (w/v) in N,N-Dimethylformamide (DMF); characterized for porosity, pressure drop, air permeability and particle filtration efficiency (PFE). Densities are found very less (0.11 to 0.21 g/cm3), with porosities the range 80–92%, higher porosity was thickness. Membranes used...

2009
Bruno Lee William Bahnfleth Katja Auer

Ultraviolet Germicidal Irradiation (UVGI) systems use 254 nm UVC radiation to inactivate microorganisms in the air and on surfaces. In-duct UVGI systems are installed in air-handling units or air distribution systems to inactivate microorganisms “on the fly” and on surfaces. The literature contains few investigations of the economic performance of UVGI. This study presents a simulation-based li...

2014
Matthew D Brace Elizabeth Stevens S Mark Taylor Sarah Butt Zhennan Sun Licai Hu Megan Borden Neeraj Khanna James Kuchta Jonathan Trites Robert Hart Mark D Gibson

Objectives: To measure changes in air quality during surgery. Methods: Operating room (OR) and hallway air quality was continuously monitored over a 3-month period. Rooftop monitoring was used to control for environmental changes and to account for the infiltration of outdoor air pollutants. Air quality measurements were correlated with operative times and electro-dissection equipment used. Res...

پایان نامه :وزارت بهداشت، درمان و آموزش پزشکی - دانشگاه علوم پزشکی و خدمات بهداشتی درمانی مشهد - دانشکده دندانپزشکی 1391

دست یابی به سیل ایده آل در ترمیم های کامپوزیتی یکی از مهمترین اهداف دندانپزشکی ترمیمی در سالهای اخیر بوده است. بررسی نفوذ رنگ رایج ترین شیوه مطالعه ریز نشت است. این روش از ارزیابی سه بعدی حساسیت کمتری دارد. به دلیل فقدان مطالعات ارزیابی ریزنشت کامپوزیت ها به روشfluid filtration در دندان های شیری، در این تحقیق بر آن شدیم تا میزان ریزنشت باندینگهایself etch و total etchرا در دندان های شیری به روش...

2017
Bing Feng Ng Jin Wen Xiong Man Pun Wan

The recent episodes of haze in Southeast Asia have caused some of the worst regional atmospheric pollution ever recorded in history. In order to control the levels of airborne fine particulate matters (PM) indoors, filtration systems providing high PM capturing efficiency are often sought, which inadvertently also results in high airflow resistance (or pressure drop) that increases the energy c...

Journal: :Compounds 2023

Air filtration is an urgent global need because, in many countries and regions, the high concentration of inhalable suspended particles air causing irreversible damage to human health. The use nanofibrous membranes can help reduce airborne particulate matter because their large surface area, extremely porous structure, adjustable pore size. However, despite unique properties, main drawbacks nan...

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