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Träfflista för sökning "WFRF:(Karlström Anders) srt2:(2005-2009)"

Sökning: WFRF:(Karlström Anders) > (2005-2009)

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  • Karlström, Anders, 1977, et al. (författare)
  • An extended analytical model including a layered
  • 2005
  • Ingår i: Environmental Vibrations, ISEV2005. - 0415390354 ; , s. 303-310
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • Ground vibrations are investigated with an analytical approach. The ground is modelled as a layered half-space on which a layered embankment is placed. Situated on top of the embankment, the sleepers are modelled with an anisotropic Kirchhoff plate and the rails as Euler-Bernoulli beams. In the equation for the rails, propagating wheel loads with constant velocity are accounted for. The analyzing method is based on Fourier transforms in time and along the space coordinate parallel with the track. In the transverse direction Fourier transforms are adopted in the ground, whereas Fourier cosine and Fourier sine series are used in the embankment layers. The numerical scheme is very efficient. In particular the beam-like rectangular elastic region (embankment) is compared with the Euler-Bernoulli beam, both supported on a layered ground. With the same bending stiffness, the two solutions are seen to differ already from 0 Hz.
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  • Karlström, Anders, 1977, et al. (författare)
  • Efficiency of trenches along railways for trains moving at sub- or supersonic speeds
  • 2007
  • Ingår i: Soil Dynamics and Earthquake Engineering. ; 27, s. 625-641
  • Tidskriftsartikel (refereegranskat)abstract
    • A full 3D analytical approach is adopted to account for trenches on one or both sides close to a railroad. Low-frequency ground vibrations are investigated due to passing trains, and open trenches are used as wave barriers. The modelling technique is based on Fourier transforms and Fourier series. The ground is modelled as a layered semi-infinite domain and the embankment with finite layers. The trenches are obtained by simulating the upper surface layer with two or three finite rectangular regions with appropriate widths. A particular boundary condition is adopted on the vertical sides of all finite regions to enable the solution procedure. Rails and sleepers are accounted for with Euler-Bernoulli beams and an anisotropic plate with transversal isotropy. The wheel loads from the boggie wheel pairs of the train are simulated as moving forces. Hence, no irregularities in rails or wheels are accounted for.
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  • Bergqvist, David, et al. (författare)
  • Inga dödsfall/slaganfall efter kirurgi vid asymtomatisk karotisstenos : femårsresultat redovisat i riksstäckande register
  • 2006
  • Ingår i: Läkartidningen. - 0023-7205 .- 1652-7518. ; 103:5, s. 301-302
  • Tidskriftsartikel (refereegranskat)abstract
    • In the Swedish vascular registry 7473 carotid endarterectomies are registered, in 10% the indication being a symptomatic stenosis. There are great variations in indication for carotid endarterectomy within Sweden. During the last five years the combined postoperative mortality and/or postoperative permanent stroke has varied between 3% in 1999 and 1.5% in 2003. During the same period not a single patient operated on for a symptomatic carotid stenosis experienced these complications.
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  • Dagsvik, John K., et al. (författare)
  • Compensating variation and Hicksian choice probabilities in random utility models that are nonlinear in income
  • 2005
  • Ingår i: The Review of Economic Studies. - : Oxford University Press (OUP). - 0034-6527 .- 1467-937X. ; 72:1, s. 57-76
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper we discuss Hicksian demand and compensating variation in the context of discrete choice. We first derive Hicksian choice probabilities and the distribution of the (random) expenditure function in the general case when the utilities are nonlinear in income. We subsequently derive exact and simple formulae for the expenditure and choice probabilities under price (policy) changes conditional on the initial utility level. This is of particular interest for welfare measurement because it enables the researcher to compute the distribution of compensating variation in a simple way. We also derive formulae for the joint distribution of expenditure, the choice before and after a policy change has been introduced.
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  • Resultat 1-10 av 68
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