نتایج جستجو برای: air filtration

تعداد نتایج: 242582  

Journal: :Environmental science & technology 2014
Amanda J Wheeler Mark D Gibson Morgan MacNeill Tony J Ward Lance A Wallace James Kuchta Matt Seaboyer Ewa Dabek-Zlotorzynska Judith Read Guernsey David M Stieb

Residential wood combustion is an important source of ambient air pollution, accounting for over 25% of fine particulate matter (PM2.5) emissions in Canada. In addition to these ambient contributions, wood smoke pollutants can enter the indoor environment directly when loading or stoking stoves, resulting in a high potential for human exposure. A study of the effectiveness of air cleaners at re...

Journal: :Brazilian dental journal 2004
Andréa Gonçalves João Manuel Domingos de Almeida Rollo Marcelo Gonçalves Francisco Haiter Neto Frab Norberto Bóscolo

This study evaluated the performance of aluminum-copper alloy filtration, without the original aluminum filter, for dental radiography in terms of x-ray energy spectrum, air kerma rate and image quality. Comparisons of various thicknesses of aluminum-copper alloy in three different percentages were made with aluminum filtration. Tests were conducted on an intra-oral dental x-ray machine and wer...

2016
Min Tang Yun Liang Jian Hu

Air quality control has become increasingly important in many industrial areas. Glass fiber filter paper is widely used for the collection of airborne particulate matter. Since glass fiber is fragile, fiber dispersion is believed to be important for controlling filter paper properties. In this paper, the impact of fiber dispersion on filtration performance and tensile properties was studied. Tw...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده فنی 1391

the study of air infiltration into the buildings is important from several perspectives that may be noted to energy and design of hvac systems, indoor air quality and thermal comfort and design of smoke control systems. given the importance of this issue, an experimental and numerical study of air infiltration through conventional doors and windows has been explored in iran. to this end, at fir...

Journal: :Diabetes & Metabolic Syndrome: Clinical Research & Reviews 2021

Journal: :Material science & engineering international journal 2022

The development of modern science and technology, improving the level industrialization, increase people's awareness environmental protection were leaded to world's demand for filter materials purify air. This review presented an overview air pollutants classification, history fiber materials, theory filtration traditional (materials, characteristics, advantages, disadvantages, standards). In a...

Journal: :Environmental Health 2008
Theodore A Myatt Taeko Minegishi Joseph G Allen David L MacIntosh

BACKGROUND Reducing exposure to environmental agents indoors shown to increase asthma symptoms or lead to asthma exacerbations is an important component of a strategy to manage asthma for individuals. Numerous investigations have demonstrated that portable air cleaning devices can reduce concentrations of asthma triggers in indoor air; however, their benefits for breathing problems have not alw...

Journal: :International Conference on Aerospace Sciences and Aviation Technology 1987

2014
A. Hellmann T. K. Müller J. Meyer G. Kasper

In the field of aerosol filtration, electrostatic effects are relatively unexplored but absolutely decisive in many applications (Rengasamy, 2009). It is possible to adjust and improve the particle deposition for synthetic filter materials to increase the initial filtration efficiency. E.g. it is used in respiratory protective devices, cabin air filters or air conditioning systems. The measurem...

Journal: :BSAP Occasional Publication 1987

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