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Sökning: swepub > (1990-1994) > (1990) > Tidskriftsartikel

  • Resultat 1-10 av 1885
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2.
  • Hansbo, Peter F G, 1959, et al. (författare)
  • A velocity-pressure streamline diffusion finite element method for the incompressible Navier-Stokes equations
  • 1990
  • Ingår i: Computer Methods in Applied Mechanics and Engineering. - LAUSANNE : Elsevier BV. ; 84:2, s. 175-192
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper a streamline diffusion finite element method is introduced for the time-dependent incompressible Navier-Stokes equations in a bounded domnain in R^2 and R^3 in the case of high Reynolds number flow. 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 consists 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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3.
  • Johnson, Claes, et al. (författare)
  • On the convergence of shock-capturing streamline diffusion finite element methods for hyperbolic conservation laws
  • 1990
  • Ingår i: Mathematics of Computation. - PROVIDENCE : American Mathematical Society (AMS). - 0025-5718 .- 1088-6842. ; 54:189, s. 107-129
  • Tidskriftsartikel (refereegranskat)abstract
    • We extend our previous analysis of streamline diffusion finite element methods for hyperbolic systems of conservation laws to include a shock-capturing term adding artificial viscosity depending on the local absolute value of the residual of the finite element solution and the meh size. With this term present, we prove a maximum norm bound for finite element solutionsof Burgers' equation an thus complete an earlier convergence proof for this equation. We further prove, using entropy variables, that a strong limit of finite element solutions is a weak solution of the system of conservation laws and satisfies the entropy inequality asociated with the entropy variables. Results of some numerical experiments for the time-dependent compressible Euler equations in two dimensions are also reported.
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  • Alston-Smith, J, et al. (författare)
  • Endotoxin, epinephrine, glucagon, insulin and calcium ionophore A23187 modulation of pyruvate kinase activity in cultured rat hepatocytes
  • 1990
  • Ingår i: Acta chirurgica Scandinavica. - : Taylor & Francis. ; 156:10, s. 677-681, s. 677-681
  • Tidskriftsartikel (refereegranskat)abstract
    • Altered glucose metabolism is one of the commonly observed sequelae of sepsis and septic shock. The present investigation was undertaken to determine the role of endotoxin (ET) upon hepatocyte glucoregulation, by measuring the activity of pyruvate kinase (PK), a key glycolytic enzyme. Hepatocytes were exposed to endotoxin concentrations known to occur in vivo during sepsis, i.e., from 1 X 10(-14) to 1 X 10(-8) g/ml. The alteration of the enzyme activities after addition of epinephrine, glucagon, insulin and calcium ionophore A23187 with and without ET preincubation were also examined. ET alone decreased the PK activity by 12% at all concentrations tested. The basal inhibition of the enzyme caused by epinephrine (-48%) was partially blocked by ET preincubation above 1 X 10(-10) g/ml. There were no ET-(glucagon, calcium ionophore, insulin) interaction. These in vitro results do not support pyruvate kinase as a site of hepatic enzyme regulation defect in endotoxaemia. 
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9.
  • Andersson, Britt M., et al. (författare)
  • Electrical transport properties of dense bulk YBa2Cu4O8 produced by hot isostatic pressing
  • 1990
  • Ingår i: Physica. C, Superconductivity. - 0921-4534 .- 1873-2143. ; 170:5-6, s. 521-531
  • Tidskriftsartikel (refereegranskat)abstract
    • Highly dense sintered YBa2Cu4O8 has been produced by hot isostatic pressing (HIP). The electrical resistivity varrho of this material has been measured as a function of temperature T and pressure varrho in the range 40–650 K and 0–0.7 GPa. Both the temperature dependence and the pressure dependence of varrho are found to be well described by a model based on the standard Bloch-Grüneisen theory. It is pointed out that varrho is liner in T only under isobaric conditions, while varrho is strongly nonlinear in all high-Tc superconductors under isochoric (constant volume) conditions. The critical current density of the material is 900 A/cm2 at 4 K, while the resistivity is 630 μΩ cm at 294 K.
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