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Träfflista för sökning "WFRF:(Hardy John) srt2:(1975-1979)"

Sökning: WFRF:(Hardy John) > (1975-1979)

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1.
  • Hardy, Kenneth A., et al. (författare)
  • Elemental Constituents of Miami Aerosol as Function of Particle Size
  • 1976
  • Ingår i: Environmental Science & Technology. - : American Chemical Society (ACS). - 1520-5851 .- 0013-936X. ; 10:2, s. 176-182
  • Tidskriftsartikel (refereegranskat)abstract
    • Results are presented of proton-induced x-ray emission analysis of aerosol samples taken in Miami, Fla., in the summer of 1974. Elemental concentrations and elemental ratios as a function of particle size are shown for 13 elements. These size distributions allow the determination of the sources of several elements observed in the Miami aerosol. Data from north Florida and Bermuda are compared.
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2.
  • Akselsson, Roland, et al. (författare)
  • X-Ray Techniques for Aerosol Sulfur Baseline Assessment Along an Urban Freeway
  • 1976
  • Ingår i: Advances in X-Ray Analysis. ; 19, s. 415-425
  • Tidskriftsartikel (refereegranskat)abstract
    • Atmospheric aerosol particles have been sampled near a Los Angeles freeway and analyzed by proton-induced X-ray emission, PIXE, as a sulfur baseline study in September 1974 before 1975-model automobiles, equipped with catalytic emission control devices, appeared in large numbers. The sampling plan was optimized according to the requirements of X-ray analysis techniques, fluctuations in air flow across the freeway, and the time and particle size resolution of the aerosol sampling equipment. During five selected two-hour intervals with cross wind conditions, particles were collected as a function of size by six cascade impactors operating simultaneously on three towers at 2 and 7 meters above road level 35 meters upwind and 35 meters downwind of the traffic lanes. Particles as a function of time were sampled continuously, for the 100-hour duration of the experiment, from the tree 7-meter heights using time series streaker filter samplers with two-hour time resolution. Precise analysis of S, Cl, K, Ca, Fe, Br, and Pb established relationships which permit estimates to be made of future increases in particulate sulfur as a consequence of increased sulfate emissions from catalytic automobiles
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