874 resultados para Problematic internet use


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Federal Highway Administration, Office of Safety and Traffic Operations Research and Development, McLean, Va.

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Federal Aviation Administration, Office of Aviation Medicine, Washington, D.C.

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Federal Highway Administration, Washington, D.C.

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National Highway Traffic Safety Administration, Washington, D.C.

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Federal Highway Administration, Washington, D.C.

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National Highway Traffic Safety Administration, Washington, D.C.

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National Highway Traffic Safety Administration, Vehicle Engineering Research Division, Washington, D.C.

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National Highway Traffic Safety Administration, Vehicle Engineering Research Division, Washington, D.C.

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National Highway Traffic Safety Administration, Vehicle Engineering Research Division, Washington, D.C.

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Because the use of filters to sample particulate matter suspended in the upper atmosphere has been investigated and has yielded rather disappointing results, an examination of other methods of upper atmospheric sampling is desirable, and this is the aim of the present report. The nature of any radioactive material, and its relation to the size and composition of the suspended particles is of particular interest.