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Sökning: LAR1:uu > VTI - Statens väg- och transportforskningsinstitut > Uppsala universitet

  • Resultat 1-7 av 7
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1.
  • Johansson, Bo S, et al. (författare)
  • Zone of free movement and children's traffic accident risks
  • 1996
  • Ingår i: Proceedings of Road safety in Europe. Conference in Birmingham, United Kingdom, September 9-11, 1996. - Linköping : Statens väg- och transportforskningsinstitut. ; , s. 141-155, s. 141-
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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2.
  • Jägerbrand, Annika, 1972-, et al. (författare)
  • Variation in responses to temperature treatments ex situ of the moss Pleurozium schreberi (Willd. ex Brid.) Mitt. originating from eight altitude sites in Hokkaido, Japan
  • 2014
  • Ingår i: Journal of Bryology. - : Taylor & Francis. - 0373-6687 .- 1743-2820. ; 36:3, s. 209-216
  • Tidskriftsartikel (refereegranskat)abstract
    • Thermal acclimatisations are important for the survival and growth of individuals and populations but seldom studied for different populations of bryophytes. The aims of this study were to (I) investigate if responses to temperature treatments were independent of the site sampled or if the intra- and inter-population variation in responses were larger than the responses to the temperature treatments (control, press, and pulse), and to (II) examine if experimental responses varied, depending on the sampled sites. We collected samples of the circumpolar bryophyte species, Pleurozium schreberi (Willd. ex Brid.) Mitt., originating from eight altitude sites on Mt. Oakan in Hokkaido, Japan, and exposed them to three different temperature treatments ex situ for four weeks. Thermal acclimatisation was estimated by measuring responses in growth length increase, biomass increase, number of branches, and the maximum quantum yield of PS II (Fv/Fm). We found that responses to temperature treatments were dependent on the site sampled, and that differences were most pronounced in the length increase. Results also shows that the responses to experimental treatments may differ between sites. Our results therefore raise important concerns regarding the general validity of both ex situ and in situ experiments when performed on a single or a limited number of sites.
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3.
  • Levin, Lena, 1958-, et al. (författare)
  • Unpacking corrections in mobile instruction : Error-occasioned learning opportunities in driving, cycling and aviation training
  • 2017
  • Ingår i: Linguistics and Education. - : Elsevier BV. - 0898-5898 .- 1873-1864. ; 38, s. 11-23
  • Tidskriftsartikel (refereegranskat)abstract
    • This article deals with the organisation of correction in mobile instructional settings. Five sets of video data (>250 h) documenting how learners were instructed to fly aeroplanes, drive cars and ride bicycles in real life traffic were examined to reveal some common features of correction exchanges. Through detailed multimodal analysis of participants’ actions, it is shown how instructors systematically elaborate their corrective instructions to include relevant information about the trouble and remedial action – a practice we refer to as unpacking corrections. It is proposed that the practice of unpacking the local particulars of corrections (i) provides for the instructional character of the interaction, and (ii) is highly sensitive to the relevant physical and mobile contingencies. These findings contribute to the existing literature on the interactional organisation of correction and mobility, as well as to ongoing work in ethnomethodology and conversation analysis on teaching and learning as members’ phenomena.
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4.
  • Little, Chelsea J., et al. (författare)
  • Community and species-specific responses to simulated global change in two subarctic-alpine plant communities
  • 2015
  • Ingår i: Ecosphere. - : ESA. - 2150-8925 .- 2150-8925. ; 6:11
  • Tidskriftsartikel (refereegranskat)abstract
    • Long-term observational studies have detected greening and shrub encroachment in the subarctic attributed to current climate change, while global change simulations have showed that community composition and productivity may shift drastically in arctic, subarctic, and alpine tundra plant communities in the future. However, responses to global change can be highly species-and context-dependent. We examined community-level and species-specific responses to a six-year factorial temperature and nutrient (nitrogen and phosphorus) amendment experiment in two alpine plant communities in northern Sweden: a species-poor dwarf shrub heath, and a more species-rich meadow. We hypothesized that abundance responses to global change would be variable within commonly defined vascular plant functional groups (e.g., forbs, evergreen shrubs, deciduous shrubs) and that new species would appear in experimental plots over time due to the ameliorated growing conditions. We found that within most functional groups, species were highly individualistic with respect to the global change simulation, particularly within the forbs, whereas within the shrubs, responses were neutral to negative and widely variable in magnitude. In the heath community the response of the graminoid functional group was driven almost entirely by the grass Calamagrostis lapponica, which increased in abundance by an order of magnitude in the combined temperature and nutrient treatment. Furthermore, community context was important for species' responses to the simulations. Abundance of the pan-arctic species Carex bigelowii and Vaccinium vitis-idaea responded primarily to the temperature treatment in the meadow community whereas the nutrient treatment had stronger effects in the heath community. Over six growing seasons, more new species appeared in the experimental plots than in control plots in the meadow community, whereas in the heath community only one new species appeared. Our results from two closely situated but different plant communities show that functional groups do not predict individual species responses to simulated global change, and that these responses depend to a large extent on pre-existing physical conditions as well as biotic interactions such as competition and facilitation. It may be difficult to apply general trends of global change responses to specific local communities.
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5.
  • Nilsson, Jan-Eric, 1952-, et al. (författare)
  • Vad 1998 års trafikpolitik bör innehålla
  • 1997
  • Ingår i: Ekonomisk Debatt. - : Nationalekonomiska föreningen. - 0345-2646. ; 6
  • Tidskriftsartikel (populärvet., debatt m.m.)
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6.
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7.
  • Wallen Warner, Henriette, et al. (författare)
  • Drivers' tendency to commit different aberrant driving behaviours in comparison with their perception of how often other drivers commit the same behaviours
  • 2014
  • Ingår i: Transportation Research Part F. - : Elsevier BV. - 1369-8478 .- 1873-5517. ; 27:PA, s. 37-43
  • Tidskriftsartikel (refereegranskat)abstract
    • The aim of the present study is to examine the difference between drivers' self-reported tendency to commit different aberrant driving behaviours in comparison with their perception of how often other drivers commit the same behaviours measured by the driver behaviour questionnaire (DBQ) in Sweden and Turkey, respectively. A sample of 228 Swedish and 302 Turkish drivers completed a questionnaire including questions based on the DBQ. The results showed that in both Sweden and Turkey, the participants reported committing aberrant driving behaviours less frequently than their perception of how often other drivers commit the same behaviours. The size of this difference does, however, vary depending on the DBQ-item and it is suggested that this variation could be used as a clue for understanding social acceptability.
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  • Resultat 1-7 av 7

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