Näytetään aineistoja, joilla on samankaltainen nimeke tai asiasanat.

• Regularization and finite element approximation of the wave equation with Dirichlet boundary data 

  Lasiecka, I.; Sokołowski, J.; Neittaanmäki, Pekka (Polish Academy of Sciences, Institute of Mathematics, 1990)

  A numerical method for solving the wave equation with nonhomogenuous, nonsmooth Dirichlet boundary condition is proposed. Convergence of the method is proved and some erràr estimates are derived [L-S-2]. The method ...

• Finite element approximation for a div-rot system with mixed boundary conditions in non-smooth plane domains 

  Křížek, Michal; Neittaanmäki, Pekka (Československá akademie věd. Matematický ústav., 1984)

  The authors examine a finite element method for the numerical approximation of the solution to a div-rot system with mixed boundary conditions in bounded plane domains with piecewise smooth boundary. The solvability of the ...

• A Steepest Descent Method for the Approximation of the Boundary Control in Two-Phase Stefan Problem 

  Neittaanmäki, Pekka; Tiba, D. (Cluj-Napoca : Éditions de l'Académie Roumaine, 1987)

• On the approximation of the boundary control in two-phase Stefan-type problems 

  Neittaanmäki, Pekka; Tiba, D. (Polish Academy of Sciences, 1987)

  The paper is concerned with boundary control of two-phase Stefan problems. A construction of optimal solutions, based on exploiting regularization techniques, is presented. Results of some numerical experiments are discussed.

• On the finite element method for time-harmonic acoustic boundary value problems 

  Neittaanmäki, Pekka; Picard, Rainer (Pergamon Press, 1981)

  The time harmonic acoustic boundary value problem in a smooth, bounded domain G of R2 is considered as a first order system. The optimal asymptotic L2(G) and H1(G)-error estimates 0(h2) and 0(h) resp. are derived for a ...