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Sökning: WFRF:(Fredriksson Ulf)

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41.
  • Fredriksson, Niclas, 1968, et al. (författare)
  • Organ documentation manual
  • 2005
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • The documentation manual is in itself a documentation of results from the development of a documentation policy and methodology for historical organs at Göteborg Organ Art Center. The manual aims to describe how the organ documentation work of GOArt is performed; specifically, how the documentation reports are systematized and how they are to be interpreted, what is measured, how it is measured, what equipment is used, how the equipment is used, and what the various abbreviations refer to. The aim has been to attain a high level of verifiability, making it possible not only to examine and evaluate the method itself, but also to compare of the results obtained with results of other similar documentations.
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48.
  • Fredriksson, Per, et al. (författare)
  • Wedge indentation of thin films modelled by strain gradient plasticity
  • 2008
  • Ingår i: International Journal of Solids and Structures. - : Elsevier BV. - 0020-7683 .- 1879-2146. ; 45:21, s. 5556-5566
  • Tidskriftsartikel (refereegranskat)abstract
    • A plane strain study of wedge indentation of a thin film on a substrate is performed. The film is modelled with the strain gradient plasticity theory by Gudmundson [Gudmundson, P., 2004. A unified treatment of strain gradient plasticity. journal of the Mechanics and Physics of Solids 52, 1379-1406] and analysed using finite element simulations. Several trends that have been experimentally observed elsewhere are captured in the predictions of the mechanical behaviour of the thin film. Such trends include increased hardness at shallow depths due to gradient effects as well as increased hardness at larger depths due to the influence of the substrate. In between, a plateau is found which is observed to scale linearly with the material length scale parameter. It is shown that the degree of hardening of the material has a strong influence on the substrate effect, where a high hardening modulus gives a larger impact on this effect. Furthermore, pile-up deformation dominated by plasticity at small values of the internal length scale parameter is turned into sink-in deformation where plasticity is suppressed for larger values of the length scale parameter. Finally, it is demonstrated that the effect of substrate compliance has a significant effect on the hardness predictions if the effective stiffness of the substrate is of the same order as the stiffness of the film.
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50.
  • Fredriksson, Rikard, 1967, et al. (författare)
  • European NCAP Program Developments to Address Driver Distraction, Drowsiness and Sudden Sickness
  • 2021
  • Ingår i: Frontiers in Neuroergonomics. - : Frontiers Media SA. - 2673-6195. ; 2
  • Tidskriftsartikel (refereegranskat)abstract
    • Driver distraction and drowsiness remain significant contributors to death and serious injury on our roads and are long standing issues in road safety strategies around the world. With developments in automotive technology, including driver monitoring, there are now more options available for automotive manufactures to mitigate risks associated with driver state. Such developments in Occupant Status Monitoring (OSM) are being incorporated into the European New Car Assessment Programme (Euro NCAP) Safety Assist protocols. The requirements for OSM technologies are discussed along two dimensions: detection difficulty and behavioral complexity. More capable solutions will be able to provide higher levels of system availability, being the proportion of time a system could provide protection to the driver, and will be able to capture a greater proportion of complex real-word driver behavior. The testing approach could initially propose testing using both a dossier of evidence provided by the Original Equipment Manufacturer (OEM) alongside selected use of track testing. More capable systems will not rely only on warning strategies but will also include intervention strategies when a driver is not attentive. The roadmap for future OSM protocol development could consider a range of known and emerging safety risks including driving while intoxicated by alcohol or drugs, cognitive distraction, and the driver engagement requirements for supervision
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