نتایج جستجو برای: air filters
تعداد نتایج: 247907 فیلتر نتایج به سال:
conclusions results of this study showed that the screen3 software is one of the popular models for estimating the distribution of air pollutants. nitrogen dioxide emissions are highly regulated in most industrialized regions. decreased emissions from fuel combustion, the use of scrubbers and filters that absorb pollution can be very useful for reduction and control of nitrogen dioxide emission...
original article electrospun nanofibrous filter media have attracted considerable attention in the last decade. the present study aimed to develop the electrospun pan (polyacrylonitrile) filter media through experimental investigations for application in high-performance air filters. for this purpose, an experimental design was proposed to assess the effect of electrospinning process conditio...
Recommendations for allergen avoidance or allergen reduction measures play an important part in the treatment of allergic asthmatic patients. The purpose of this study was to test recently developed air-cleaners with respect to their capacity to capture airborne allergen particles and to improve clinical parameters of asthmatic patients sensitized to aeroallergens. Forty five allergic asthmatic...
pan Association for Working Environment Measurement. The vapor pressures of these substances have been determined to be 2.5 •~ 10 mmHg for o-phthalodinitrile at 26•Ž, and 5 •~ 10-3 mmHg for acrylamide at 25•Ž, using the vapor saturation method.3) Due to sublimation on the filter, however, filter sampling of these substances may yield a lower value than their actual environmental concentration. ...
OBJECTIVE Gohieria fusca(Oudemans, 1902) is recognized to breed in wheat flour, rice, corn, feeds, wheat bran and herbal medicines as well as other stored products, and capable of having mild to moderate cross reactivity with allergens of house dust mites, an important source of indoor allergens associated with asthma and other allergic conditions. Air-conditioning systems are indispensable in ...
The Department of Energy currently employs high-efficiency particulate air (HEPA) filters in a variety of applications, such as particulate matter removal from ventilation air and treatment of off-gasses from storage or remediation of mixed wastes. Section FC of the ASME AG-1 Code addresses glass fiber HEPA filters and restricts the media velocity to a maximum of 5 ft/min. Advances in filtratio...
HEPA filters, once known as absolute filters, were originally developed as the particulate stage of a chemical, biological, radiological (CBR) filtration/adsorber unit for use by the U.S. Armed Services. In the late 1940s the U.S. Atomic Energy Commission adopted them for use for the containment of airborne radioactive particulates in the exhaust ventilation systems of experimental reactors as ...
Many applications require the ability to image a scene in several different narrow spectral bands simultaneously. Conventional multi-layer dielectric filters require control of film thickness to change the resonant wavelength. This makes it difficult to fabricate a mosaic of multiple narrow spectral band transmission filters monolithically. We adjusted the spectral transmission of a multi-layer...
PURPOSE To analyze and characterize a multidisciplinary, integrated indoor air quality checklist for evaluating the health risk of building occupants in a nonindustrial workplace setting. DESIGN A cross-sectional study based on a participatory occupational health program conducted by the National Institute of Occupational Safety and Health (Malaysia) and Universiti Putra Malaysia. METHOD A ...
The present paper focuses on biomonitoring of elemental atmospheric pollution, which is reviewed in terms of larger-scaled biomonitoring surveys in an epidemiological context. Based on the literature information, today's availability of solar-powered small air filter samplers and fibrous ion exchange materials is regarded as adequate or an even better alternative for biomonitor transplant mater...
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