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Träfflista för sökning "WFRF:(Larsson Mikael) srt2:(1995-1999)"

Sökning: WFRF:(Larsson Mikael) > (1995-1999)

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1.
  • Nilsson, Martin, et al. (författare)
  • Measurements of the Spatio-Temporal Polarization Characteristics of a Radio Channel at 1800 MHz
  • 1999
  • Ingår i: Proceedings IEEE Vehicular Technology Conference. - : IEEE. ; , s. 386-391
  • Konferensbidrag (refereegranskat)abstract
    • We present a combined measurement and analysis of the spatial, temporal, and polarisation characteristics of a 1800 MHz radio channel. The measurements were performed using a correlative channel sounder. A complex chirp signal with a bandwidth of 150 MHz was transmitted by a vertically polarized omnidirectional antenna and received by a 8+8 dual polarized planar antenna array. Measurements were taken at two different base station locations, one being suburban and the other urban. Using this data we characterize the radio channel in terms of azimuth and delay spread of the vertical and horizontal polarization.
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  • Erkfeldt, Sara U, 1974, et al. (författare)
  • Poisoning and regeneration of NOx adsorbing catalysts for automotive applications
  • 1999
  • Ingår i: Studies in Surface Science and Catalysis. - 0167-2991. ; 126, s. 211-218
  • Tidskriftsartikel (refereegranskat)abstract
    • The efficiency and product formation as a function of temperature, time and gas stoichiometry, in the regeneration of an SO2 poisoned NOx storage and reduction (NSR) catalyst has been studied. Using these results a simple model for sulphur poisoning and regeneration of this type of catalyst is proposed. SO2 poisons the catalyst, which results in a decrease of the NOx conversion with increasing SO2 exposure time. The NOx storage capacity can be regained after regeneration of the catalyst. The regeneration is most effective using long regeneration time, high temperature and low lambda value. A measure of the regeneration efficiency, activity based sulphur removal (ASR), is defined. ASR is used to model the regeneration efficiency with the independent variables; regeneration time, temperature and lambda value. The model describes the experimental results well. The amounts of released SO2, H2S and COS, during the regeneration differ depending on regeneration conditions. Low lambda values give high amounts of H2S and low amounts of SO2, whereas the reverse is true for high lambda values. The production of COS is low in all cases. The results can schematically be described with a model where sulphur can migrate between deactivating and non-deactivating positions on the catalyst surface.
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  • Erkfeldt, Sara U, 1974, et al. (författare)
  • Sulphur poisoning and regeneration of NOx trap catalyst for direct injected gasoline engines
  • 1999
  • Ingår i: Society of Automotive Engineers Technical Paper Series. - 400 Commonwealth Drive, Warrendale, PA, United States : SAE International. ; 1999:SP-1476, s. 51-62
  • Tidskriftsartikel (refereegranskat)abstract
    • Sulphur poisoning and regeneration of NOx trap catalysts have been studied in synthetic exhausts and in an engine bench. Sulphur gradually poisoned the NO x storage sites in the axial direction of the NO x trap. During sulphur regenerations, hydrogen was found to be more efficient than carbon monoxide in removing the sulphur from the trap. The sulphur regeneration became more efficient the richer the environment (λ
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  • Holgerson, Mikael, et al. (författare)
  • Plough and Stretch Losses for Rolling Ball in Grease
  • 1997
  • Ingår i: Proceedings of the fifth International Symposium on Cold Region Development, Anchorage, Alaska, USA, May 4-10, 1997. - : International Association of Cold Regions Development Studies. ; , s. 629-632
  • Konferensbidrag (refereegranskat)
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