منابع مشابه
Safety of portable inoculation cabinets.
Laboratory work with pathogenic microorganisms should be performed in a ventilated safety cabinet. A minimum airflow of 0-5 metres per second through the working aperture has been recommended, with discharge of the exhaust air through a filter, then into the open air (Department of Health and Social Security, 1970). Such a unit must be permanently installed. There are possible advantages to a p...
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While musical instruments often rely on a body which resonates on purposefully to amplify the vibration produced by a string or a membrane, such as in a violin or a guitar, loudspeaker cabinets should not contribute at all to the total sound radiation, but aim instead to be a perfectly rigid box which encloses the drive units in charge to transform the electrical signal at their terminal into a...
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T he pathologist makes do with red wine until an effective drug is available, the biochemist discards the bread from her sandwiches, and the mathematician indulges in designer chocolate with a clear conscience. The demographer sticks to vitamin supplements, and while the evolutionary biologist calculates the compensations of celibacy, the population biologist transplants gonads, but so far only...
متن کاملAnalyzing the Failure of Master Mould in Casting of Copper Anode Moulds and Suggesting a more Suitable Metal Mould
Master moulds are used to cast copper anode moulds. These iron moulds are made of grey or nodular cast irons. According to desirable properties of ductile irons, it was expected that ductile cast iron ...
متن کاملEvaluation of laminar flow microbiological safety cabinets.
The microbiological control efficiency of two class 100 laminar down-flow hoods was determined by using aerosols of Bacillus subtilis var. niger spores. The first unit challenged utilized a slanted eyelid to partially enclose the front work opening. This hood showed nearly perfect control of ambient organisms in the work area. It also gave a 10(6) or greater drop in the number of organisms pass...
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ژورنال
عنوان ژورنال: Psyche: A Journal of Entomology
سال: 1893
ISSN: 0033-2615,1687-7438
DOI: 10.1155/1893/57921