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Träfflista för sökning "(WAKA:kon) srt2:(1970-1979) srt2:(1974)"

Sökning: (WAKA:kon) srt2:(1970-1979) > (1974)

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1.
  • Akselsson, Roland, et al. (författare)
  • Elemental Abundance Variation with Particle Size in Aerosols from Welding Operations
  • 1974
  • Ingår i: Proceedings of the Second International Conference on Nuclear Methods in Environmental Research. ; , s. 395-401
  • Konferensbidrag (refereegranskat)abstract
    • The effect of airborne particulate matter on human health is today of considerable research interest. Essential parameters include elemental composition sampling with low pressure cascade impactors and analysis by particle induced x-ray emission spectroscopy (PIXE). It is shown that the aerosol generated by arc welding operations is several orders of magnitude denser than aerosols in ambient air. Most of the mass is found on particles between 0.1 and 1µm diameter, but the size distribution differs from one welding technique to another. The relative composition of the aerosol is found to differ significantly from that of both the welding piece and the electrode indicating the presence of fractionation of the type indicated in this work in designing electrodes and welding pieces to minimize the health hazards associated with the welding.
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  • Borisson, Ulf, et al. (författare)
  • An Industrial Application of a Self-Tuning Regulator
  • 1974
  • Ingår i: 4th IFAC/IFIP International Conference on Digital Computer Applications to Process Control. - Berlin, Heidelberg : Springer Berlin Heidelberg. - 9783540066200 ; 93
  • Konferensbidrag (refereegranskat)abstract
    • An implementation of a self-tuning regulator is described. The regulator algorithm consists of two steps. Firstly the parameters of a model of the process are estimated in real time using the method of least squares. Secondly a minimum variance regulator based on the estimated parameters is computed at each sampling interval. Implementation of the algorithm on a process computer is discussed. Questions concerning program structure and storage requirements are considered. Results from the moisture content control on a paper machine are presented. The experiences are very good concerning the start-up behaviour as well as the stationary behaviour of the self-tuning regulator.
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