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Sökning: L773:0021 8502

  • Resultat 1-10 av 95
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1.
  • Asking, Lars, et al. (författare)
  • An electrostatic aerosol sampler
  • 1988
  • Ingår i: Journal of Aerosol Science. - : Elsevier BV. - 0021-8502. ; 19:7, s. 1023-1026
  • Tidskriftsartikel (refereegranskat)
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  • Bower, K. N., et al. (författare)
  • Observations of the interaction of an urban plume with cloud
  • 2000. - SUPPL. 1
  • Ingår i: European Aerosol Conference 2000. - 0021-8502. ; 31, s. 66-67
  • Konferensbidrag (refereegranskat)abstract
    • Experiments were performed to examine the effects of the properties of the aerosol and trace gases in the airmassflowing into cloud on the microphysics and chemistry of the cloud and to investigate the role of the cloud in modifying the properties of the aerosol and trace gases emerging downwind of the cloud system. Measurements of the aerosol properties were made at out of the cloud sites both upwind and downwind of the cloud. Cloud microphysical measurements and bulk and size segregated cloud water chemical measurements were made along with measurements of the aerosol and gases interstitial to the cloud droplets.
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6.
  • Cederfelt, Sven Inge, et al. (författare)
  • On the charge limit for crystallizing particles
  • 1990
  • Ingår i: Journal of Aerosol Science. - 0021-8502. ; 21:SUPPL. 1, s. 127-130
  • Tidskriftsartikel (refereegranskat)abstract
    • The electrical charge limit of crystallizing sodium chloride droplets has been studied. Moderately charged sodium chloride solution droplets were dried to highly charged residual particles. The charge limit was found to be near the Rayleigh charge limit for saturated sodium chloride droplets of the same size as the residual particle. The charge loss was not found to affect the particle size to a detectable degree.
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  • Deppert, Knut, et al. (författare)
  • Size-selected nanocrystals of III-V semiconductor materials by the aerotaxy method
  • 1998
  • Ingår i: Journal of Aerosol Science. - 0021-8502. ; 29:5-6, s. 737-748
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper we present a fabrication route to produce size-selected III-V semiconductor nanocrystals via a simple, reliable, and efficient aerosol route. Since this approach includes the reaction of aerosol particles and a self-organized growth of a new compound, all in the aerosol phase, we call this process aerotaxy. Size-selected nanocrystals of different III-V compounds in a diameter range below 20 nm were fabricated using this method. Through the reaction of arsine with gallium droplets or of phosphine with indium droplets, GaAs and InP clusters were formed. Our approach opens the possibility to produce contamination-free and size-selected nanocrystals of compound semiconductor materials with considerable freedom in composition and size.
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  • Frank, Göran, et al. (författare)
  • Characterisation of a unipolar charger for droplet aerosols of 0.1-20 mu m in diameter
  • 2004
  • Ingår i: Journal of Aerosol Science. - 0021-8502. ; 35:1, s. 117-134
  • Tidskriftsartikel (refereegranskat)abstract
    • A charging unit for unipolar charging of cloud and fog droplets has been developed and calibrated regarding ion current, angular distribution of ions, mean droplet charge and droplet charge distribution. The charger is part of the droplet aerosol analyser, which is an instrument used for characterisation of droplets and interstitial particles in atmospheric clouds and fog. Three different calibration methods have been used for the charge calibration, whereof the third and newest method makes use of a differential mobility analyser, especially developed for large particles, up to at least 20 mum in diameter. The number of charges acquired is a strictly increasing function of the droplet diameter. Two charging models have been used for comparisons with the measurements and both models show good agreement with the data regarding the size dependency of the charge level. Both models can thus be used to describe the performance of the charger. (C) 2003 Elsevier Ltd. All rights reserved.
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