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Sökning: WFRF:(Sandberg E) > (2015-2019)

  • Resultat 1-10 av 98
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  • 2017
  • Ingår i: Physical Review D. - 2470-0010 .- 2470-0029. ; 96:2
  • Tidskriftsartikel (refereegranskat)
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  • Amanullah, Rahman, et al. (författare)
  • Diversity in extinction laws of Type Ia supernovae measured between 0.2 and 2 μm
  • 2015
  • Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 453:3, s. 3300-3328
  • Tidskriftsartikel (refereegranskat)abstract
    • We present ultraviolet (UV) observations of six nearby Type Ia supernovae (SNe Ia) obtained with the Hubble Space Telescope, three of which were also observed in the near-IR (NIR) with Wide-Field Camera 3. UV observations with the Swift satellite, as well as ground-based optical and NIR data provide complementary information. The combined data set covers the wavelength range 0.2-2 mu m. By also including archival data of SN 2014J, we analyse a sample spanning observed colour excesses up to E(B - V) = 1.4 mag. We study the wavelength-dependent extinction of each individual SN and find a diversity of reddening laws when characterized by the total-to-selective extinction R-V. In particular, we note that for the two SNe with E(B - V) greater than or similar to 1 mag, for which the colour excess is dominated by dust extinction, we find R-V = 1.4 +/- 0.1 and R-V = 2.8 +/- 0.1. Adding UV photometry reduces the uncertainty of fitted R-V by similar to 50 per cent allowing us to also measure R-V of individual low-extinction objects which point to a similar diversity, currently not accounted for in the analyses when SNe Ia are used for studying the expansion history of the Universe.
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  • Cole, S. G., et al. (författare)
  • Arctic games : An analytical framework for identifying options for sustainable natural resource governance
  • 2016
  • Ingår i: The Polar Journal. - : Taylor and Francis Ltd.. - 2154-896X .- 2154-8978. ; 6:1
  • Tidskriftsartikel (refereegranskat)abstract
    • Changes in the Arctic are fuelled by a variety of drivers, including global warming, economic growth, improved access to natural resources, technological advances and globalisation processes. Further, the region is characterised by a diverse set of international agreements, national legislations and common pool resources. This presents challenges for actors to suggest, evaluate and agree on sustainable development alternatives. We propose an analytical framework to better understand (1) the types of trade-offs associated with Arctic futures and (2) actors’ incentives for strategic behaviour. In the framework, game theory illuminates incentives and strategies among actors, cost-benefit analysis and economic valuation of ecosystem services help identify socially desirable outcomes and institutional analysis provides insight on how governance structures can support or interfere with policy intervention. We apply the proposed framework by analysing possible oil development futures for Lofoten in Northern Norway. For example, institutional analysis and estimates of costs and benefits of reducing oil spill risk and their distribution among actors are used for discussing incentive structures, including the use of side payments as a mechanism to mitigate conflicting interests. 
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