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Träfflista för sökning "LAR1:uu ;hsvcat:1;srt2:(1975-1999)"

Sökning: LAR1:uu > Naturvetenskap > (1975-1999)

  • Resultat 1-10 av 2853
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1.
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2.
  • Engquist, Björn, et al. (författare)
  • Automatic analysis in PDE software
  • 1984
  • Ingår i: PDE Software. - Amsterdam, The Netherlands : Elsevier Science. - 0444876200 ; , s. 399-409
  • Konferensbidrag (refereegranskat)
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3.
  • Engquist, Björn, et al. (författare)
  • Automatic computer code generation for hyperbolic and parabolic differential equations
  • 1980
  • Ingår i: SIAM JOURNAL ON SCIENTIFIC AND STATISTICAL COMPUTING. - : Society for Industrial & Applied Mathematics (SIAM). - 0196-5204 .- 2168-3417. ; 1:2, s. 249-259
  • Tidskriftsartikel (refereegranskat)abstract
    • A program system which generates computer code for the numerical solution of systems of hyperbolic and parabolic differential equations is described. The input to the program is a mathematical formulation of a hyperbolic or parabolic initial boundary value problem in one space dimension. The differential equations and boundary conditions are analyzed by the program system, and a finite difference algorithm is designed for the given problem. The output is an executable FORTRAN program.
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5.
  • Olsson, Pelle, et al. (författare)
  • Boundary Modifications of the Dissipation Operators for the Three–Dimensional Euler Equations
  • 1989
  • Ingår i: Journal of Scientific Computing. - 0885-7474 .- 1573-7691. ; 4:2, s. 159-195
  • Tidskriftsartikel (refereegranskat)abstract
    • Explicit methods for the solution of fluid flow problems are of considerable interest in supercomputing. These methods parallelize well. The treatment of the boundaries is of particular interest with respect to both the numeric behavior of the solution and the computational efficiency. We have solved the three-dimensional Euler equations for a twisted channel using second-order, centered difference operators, and a three-stage Runge-Kutta method for the integration. Three different fourth-order dissipation operators were studied for numeric stabilization: one positive definite, one positive semidefinite, and one indefinite. The operators only differ in the treatment of the boundary. For computational efficiency all dissipation operators were designed with a constant bandwidth in matrix representation, with the bandwidth determined by the operator in the interior. The positive definite dissipation operator results in a significant growth in entropy close to the channel walls. The other operators maintain constant entropy. Several different implementations of the semidefinite operator obtained through factoring of the operator were also studied. We show the difference both in convergence rate and robustness for the different dissipation operators, and the factorizations of the operator due to Eriksson. For the simulations in this study one of the factorizations of the semidefinite operator required 70%–90% of the number of iterations required by the positive definite operator. The indefinite operator was sensitive to perturbations in the inflow boundary conditions. The simulations were performed on a 8,192 processor Connection Machine system CM-2. Full processor utilization was achieved, and a performance of 135 Mflops/sec in single precision was obtained. A performance of 1.1 Gflops/sec for a fully configured system with 65,536 processors was demonstrated.
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9.
  • Nilsson, P. O., et al. (författare)
  • Electronic structure of buried Si layers in GaAs(001) as studied by soft-x-ray emission
  • 1995
  • Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 52, s. R8643-
  • Tidskriftsartikel (refereegranskat)abstract
    • It is demonstrated that it is possible to investigate details of the electronic structure of an internal atomic monolayer using soft-x-ray-emission spectroscopy. The local and partial density of states of one monolayer and three monolayers of Si, embedded deep below a GaAs(001) surface, was extracted. Clear differences to the density of states for bulk Si were observed.
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10.
  • Andersson, Måns Sverker, et al. (författare)
  • Glycosylated haemoglobin: a new measure of condition in birds
  • 1995
  • Ingår i: Proceedings of the Royal Society of London. ; :260, s. 299-303
  • Tidskriftsartikel (refereegranskat)abstract
    • Abstract: The influence of condition on time of breeding and reproductive success has been discussed since Darwin first suggested a relation in 1871. We used a novel method to investigate the influence of condition on the timing of breeding and reproductive success by measuring a relatively inert physiological parameter - the amount of glycosylated haemoglobin - in blood samples taken from the collared flycatcher Ficedula albicollis. The percentage of glycosylated haemoglobin (%HbG) was assumed to be proportional to the average blood glucose level, during the 3-5 weeks before the blood sampling. The %HbG was influenced neither by sex nor age. Date of arrival at the breeding ground was negatively correlated with %HbG so that early-arriving birds had significantly higher %HbG than those arriving later. Clutch size, corrected for the effect of laying date, correlated positively with %HbG in females, as did the number of fledged young, corrected for the effect of laying date, for both sexes. We found no correlation between body mass and the %HbG. We suggest that prebreeding condition influences the timing of breeding and subsequent reproductive performance and that %HbG can be used as an indicator of prebreeding-condition in migrating birds.
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