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Träfflista för sökning "WFRF:(Andersson Sven) "

Sökning: WFRF:(Andersson Sven)

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1.
  • Smith, Gudmund, et al. (författare)
  • Dialog hösten 2009
  • 2010
  • Ingår i: Kreativitet och mognad : festskrift tillägnad Professor Gudmund Smith på 90-årsdagen den 29 januari 2010. - 9789197871808 ; , s. 151-158
  • Bokkapitel (refereegranskat)
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2.
  • Allgurén, Thomas, 1986, et al. (författare)
  • Investigation of the Behavior of Alkali Chlorides during Sulfur Recirculation in a Waste-to-Energy Facility
  • 2018
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • High temperature corrosion related issues are known problems for Waste-to-Energy facilities where the formation of alkali chlorides is among the most problematic species formed during the combustion. Sulfur Recirculation is a novel technology developed to reduce the chlorine content in the ash and in that way also the corrosivity of the ash. This concept has been installed at the Maabjerg Energy Center (MEC) in Denmark. This work aims to take a first step towards a reaction kinetics based model that can describe systems like the MEC boiler and to evaluate the impact of Sulfur Recirculation. This is done by implementing a plug flow reactor model in the software Chemkin. Previously obtained data from on-site experiments and CFD simulations is used as input to the model. The model is focused on describing the sulfation of alkali chlorides and the result from the model is compared to experiments. The model is able to predict the degree of sulfation with less than 10% deviation from the experimental results. Both the experiment and the model show a clear benefit from implementing sulfur recirculation which lowers the chlorine content in the up to as much as 70%. It is, however, also shown that the results are sensitive towards several of the assumptions made. Even though there is a relatively good agreement in final sulfation between model and experiments the model is not able to represent the detailed chemistry in a realistic way in its current state; further development is required.
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3.
  • Andersson, Christer M, et al. (författare)
  • A SiC Varactor With Large Effective Tuning Range for Microwave Power Applications
  • 2011
  • Ingår i: IEEE ELECTRON DEVICE LETTERS. - : IEEE Institute of Electrical and Electronics. - 0741-3106. ; 32:6, s. 788-790
  • Tidskriftsartikel (refereegranskat)abstract
    • SiC Schottky diode varactors have been fabricated for use in microwave power applications, specifically the dynamic load modulation of power amplifiers. A custom doping profile has been employed to spread the C(V) over a large bias voltage range, thereby increasing the effective tuning range under large voltage swing conditions. The small-signal tuning range is approximately six, and punch through is reached at a bias voltage of -60 V, while the breakdown voltage is on the order of -160 V. An interdigitated layout is utilized together with a self-aligned Schottky anode etch process to improve the Q-factor at 2 GHz, which is 20 at zero bias and approximately 160 at punch through.
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8.
  • Andersson, Ingrid, et al. (författare)
  • Aesthetic representations among Himba people in Namibia
  • 2009
  • Ingår i: International Art in Early Childhood Research Journal. - University of New England, Armidale, Australia. - 1837-0020. ; 1:1, s. 1-14
  • Tidskriftsartikel (refereegranskat)abstract
    • The research in the present study focuses on preliterate people’s ways of modelling and drawing. Our aim is to understand how the participants solve the problem of making three-dimensional sculptures and two-dimensional drawings of themselves or animals in their surroundings. Also, we compare the meanings of the participants’ first-ever drawings, based on one of two ways of starting the activity. The first group was asked to draw a human figure or an animal without first creating a sculpture. The second group was asked to create sculptures before drawing the same motives. We found that both children and adults drew tadpoles. However, single view representations were more common in the group who had only made drawings, while in the sculpture/drawing-group half of the drawings showed more than one view in their representations of human figures. There were examples of culture-specific features with significant recognizable social meanings in both sculptures and drawings. The findings are discussed in terms of socio-cultural theories on the development of imagination and creative combinations in settings where new tools and tasks are at hand
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10.
  • Andersson, Ingrid, et al. (författare)
  • Conditions for Boundary Crossing : Social Practices of Newly Qualified Swedish Teachers
  • 2008
  • Ingår i: Scandinavian Journal of Educational Research. - : Informa UK Limited. - 0031-3831 .- 1470-1170. ; 52:6, s. 643-660
  • Tidskriftsartikel (refereegranskat)abstract
    • The purpose of this study is to gain knowledge about conditions for boundary crossing between academic and vocational practices and to identify dimensions of social practice within workplaces. The data consist of 28 questionnaires and 14 in-depth interviews with newly qualified secondary school teachers in their first year of teaching. We use the lens of sociocultural theory to analyse qualitatively what we can learn from newcomers talk about their experiences and whether theories provided during their teacher education helped them to meet challenges in their new workplaces. Theoretically, notions of participation in social practices in terms of social space are in focus. In the findings, such space is identified as social adjustment, social distance, social inclusion and social expansion. Drawing on these concepts, we suggest that professional development depends strongly on the way new teachers boundary crossing is supported by collaboration and to what extent they belong to professional dialogues in settings with inclusive and expansive relationships.
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