نتایج جستجو برای: air filter
تعداد نتایج: 325434 فیلتر نتایج به سال:
National Institute for Occupational Safety and Health method 7703 is a portable field procedure for the analysis of workplace air filter samples for hexavalent chromium (CrVI) content immediately after the samples are collected. The field method prescribes CrVI extraction from air filter samples with an ammonium sulfate/ammonium hydroxide extraction buffer using ultrasonic extraction (UE). Stro...
A model of a magnetic film sense system is presented. Using the model the mean time between false readouts due to random noise is determined as a function of the system parameters; total magnetic flux switched, switching time, sense line resistance, amplifier noise factor and linear amplifier filter efficiency. (The filter efficiency with respect to a given input pulse shape is the signal-to-no...
To minimize the chance of injury or disease from toxic or infectious substances, laboratory personnel are increasingly confining hazardous techniques to enclosed ventilated work cabinets. T'Ae well established use of the fume hood for chemistry has been extended to other laboratory sciences. The Atomic Energy Commission has been particularly active in this progress. The bacteriologist has recen...
BACKGROUND Exposure to particulate matter (PM) air pollution especially derived from traffic is associated with increases in cardiorespiratory morbidity and mortality. In this study, we evaluated the ability of novel vehicle cabin air inlet filters to reduce diesel exhaust (DE)-induced symptoms and markers of inflammation in human subjects. METHODS Thirty healthy subjects participated in a ra...
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