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Sökning: WFRF:(Akselsson Roland)

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271.
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272.
  • Weikert, Clemens, et al. (författare)
  • Computerization of the Control Function in a Process Industry: A Case Study
  • 1993
  • Ingår i: Interacting with Computers: Preparing for he Nineties. ; , s. 251-257
  • Konferensbidrag (refereegranskat)abstract
    • Computerization of control room functions changes the work for the operators to a great extent. Their mental picture of the process, their possibilities to control the process for productivity and quality, the work content, the physical and the social working environment are examples of conditions which are changed one way or another. In order to be able to control the computerization process in an optimal way it is important to perform and to learn from case studies. In a Swedish paper pulp industry, where computerized control and information systems have been implemented and where operators have been involved in the computerization process, we have pursued an interview investigation. Twenty-eight operators and ten employees in other key positions have been asked e.g. about the control room design, the control system, the information system the effects of computerization on the work load and on the physical, mental and social working environment. Results from the interviews are presented and discussed. The control room design and the human-computer interfaces have been evaluated against guidelines and some of the results are discussed.
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273.
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274.
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275.
  • Winchester, John W, et al. (författare)
  • Trace Metals in the St. Louis Aerosol
  • 1974
  • Ingår i: Proceedings of the Second International Conference on Nuclear Methods in Environmental Research. ; , s. 385-394
  • Konferensbidrag (refereegranskat)abstract
    • The elemental composition of the St. Louis aerosol has been investigated at rooftop sites in south and central locations in the city as part of the August, 1973 field season of the Regional Air Pollution Study of the U.S. Environmental Protection Agency. Sampling by 5-stage cascade impactor with backup filter permits analysis by proton-induced x-ray emission (PIXE) of size fractions of aerodynamic diameter >4, >2m >1, >0.5, >0.25, <0.25µm for elements 16S to 35Br by K x-ray detection and 82Pb by L x-rays. The aerosol study indicates the following: 1. Particle size distributions of S, Cl, K, Ca, Ti, V, Mn, Fe, Cu, Zn, Br, and Pb can be measured in samples from 0.7 m3 of air collected over 12-hour intervals at 1 liter/min flow rate, with precision of single analyses generally 10-30%, except near the nanogram detection limit. 2. Some elements, e.g. Ca, Fe, Ti, K show a tendency for highest concentrations in air measured in largest particle size fractions, and the pattern of distribution of concentration with size is relatively invariant. Predominantly dispersion source processes may account for their entry into the atmosphere. 3. Other elements, e.g. S, Pb, Zn, have substantial proportions of their atmospheric concentrations on smallest particles and show greater variability in particle size distribution patterns, suggesting aerosol formation processes of vapor condensation at high or low temperatures. 4. During 16-22 August 1973 an atmospheric change occurred from a period of low speed and mostly southerly air flow, with evident haze and air pollution, to higher speed and westerly shifting to easterly air flow, with improved visibility and air quality. The change was associated with drops in concentrations of Ti, Fe, Ca, K, and S but not Zn or Pb at the south site and Ti but not the other elements at the central site. Transport of air pollution from industrial sources south of the city is indicated. 5. The central site showed diurnal variation during the first period where concentrations of Ti, Fe, Ca, K, and S were higher in samples taken from midnight to noon than in those from noon to midnight. Variations were greatest for intermediate sized particles.
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