On the convergence of the finite element approximation of eigenfrequencies and eigenvectors to Maxwell's boundary value problem
Neittaanmäki, P. , Ricard, R. (1981). On the convergence of the finite element approximation of eigenfrequencies and eigenvectors to Maxwell's boundary value problem. Annales Academiæ Scientiarum Fennicæ. Series A. I. Mathematica, 6, 255-272.
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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 ...
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.
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)
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 ...