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  • Hansbo, Peter, 1959-, et al. (författare)
  • A velocity pressure streamline diffusion finite element method for Navier-Stokes equations
  • 1990
  • Ingår i: Computer Methods in Applied Mechanics and Engineering. - 0045-7825. ; 84:2, s. 175-192
  • Tidskriftsartikel (refereegranskat)abstract
    • A streamline diffusion finite-element method is introduced for the time-dependent incompressible Navier-Stokes equations in a bounded domain in R squared and R cubed in the case of a flow with a high Reynolds number. An error estimate is proved and numerical results are given. The method is based on a mixed velocity-pressure formulation using the same finite-element discretization of space-time for the velocity and the pressure spaces, which consist of piecewise linear functions, together with certain least-squares modifications of the Galerkin variational formulation giving added stability without sacrificing accuracy.
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  • Ödling, Per, et al. (författare)
  • A reduced complexity viterbi equalizer used in conjunction with a pulse shaping method
  • 1992
  • Ingår i: Proceedings of Nordic Radio Symposium : NRS 92 : wave propagation, personal, mobile and satellite communications / in co-operation with AUC - Aalborg University. - Aalborg : Aalborg University. - 0 909394 28 8 - 87-983799-1-7 ; 91-94
  • Konferensbidrag (refereegranskat)abstract
    • The complexity of the Viterbi algorithm can be reduced by linear pre-equalization. We introduce a linear preprocessor using the weighted least squares filtering of [10]. The geometric technique of L.Barbosa [3] is evoked for analytical representation of the complexity reduction by pre-equalization, and for evaluation of error performance. We give results on the bit error rate of the WLS preprocessor and of the linear preprocessor of Falconer and Magee [6].
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  • Bergström, Sven, et al. (författare)
  • Molecular characterization of Borrelia burgdorferi isolated from Ixodes ricinus in northern Sweden.
  • 1992
  • Ingår i: Scand J Infect Dis. - 0036-5548. ; 24:2, s. 181-8
  • Tidskriftsartikel (refereegranskat)abstract
    • Ixodes ricinus ticks, harbouring Borrelia burgdorferi, were found in an area in northern Sweden, not thought to be endemic for Lyme borreliosis. This investigation took place at Norrbyskär, an island situated in the Bothnian Gulf, 63 degrees 33'N/19 degrees 52'E. One of 42 nymphal and 8/43 adult I. ricinus ticks collected carried spirochetes as seen by phase contrast microscopy. Pure bacterial cultures were obtained from 2 of the ticks. Western blot analysis using species-specific monoclonal antibodies showed that the isolated spirochetes were B. burgdorferi. The identity of the isolated spirochetes was confirmed by DNA amplification using B. burgdorferi OspA and flagellin gene specific oligonucleotides as well as partial DNA sequencing of the respective OspA and flagellin genes. The 2 isolated spirochaete populations were different as shown by their protein profiles in sodium dodecyl sulphate polyacrylamide gels. Moreover, the demonstration of Lyme borreliosis in a patient from the island of Norrbyskär indicates the need for clinical consideration of this disease in northern Sweden.
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  • Cunningham, Gary, 1941-, et al. (författare)
  • Budget effectiveness in multinational companies : An empirical examination of environmental interaction on cognitive and affective effects of two dimensions of budgetary participation
  • 1993
  • Ingår i: Scandinavian Journal of Management. - Elsevier. - 0956-5221. ; 9:4, s. 299-316
  • Tidskriftsartikel (refereegranskat)abstract
    • This study examines the interaction between two dimensions of budgetary participation and environmental dynamism on perceptions of budget effectiveness in multinational companies. Unique features are dichotomies of: (i) domestic and foreign subunits; (ii) two dimensions of budget participation, communication and influence; and (iii) two facets of effectiveness perceptions, higher level involvement and outcomes of budget process. Results show that benefits of budgetary participation are limited and not consistent. Significant differences between foreign and domestic subunits are apparent. The primary perceived benefits are associated with communication. Budget influence is associated with positive perceptions of top-level involvement in foreign subunits but negative perceptions of outcomes of budget process in both domestic and foreign subunits.
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10.
  • Eriksson, Anders, 1953- (författare)
  • Derivatives of tangential stiffness matrices for equilibrium path descriptions
  • 1991
  • Ingår i: International Journal for Numerical Methods in Engineering. - 0029-5981. ; 32:5, s. 1093-1113
  • Tidskriftsartikel (refereegranskat)abstract
    • The paper describes how several procedures, based on expressions from analytical elastic stability theory, are introduced as numerical tools in a general Finite Element program for geometrically non-linear structural analysis. Especially is discussed how derivatives of the tangential stiffness matrix can be utilized in several contexts in the solution algorithm. These include improved predictions for the step-wise solution of equilibrium states, identification of critical points and accurate descriptions of initial post-bifurcation behaviour. For two plane beam and bar elements, formulations have been developed giving analytical expressions for these derivatives. The corresponding numerical approximations, needed in other element types, are also discussed. The paper discusses the relative efficiency of higher order predictions in relation to these different element types and different solution strategies. Some numerical examples, showing different types of behaviour, are analysed and discussed.
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