Search for dissertations about: "Generalized Locally Toeplitz"

Found 3 swedish dissertations containing the words Generalized Locally Toeplitz.

  2. 1. Analysis and Implementation of Preconditioners for Prestressed Elasticity Problems : Advances and Enhancements

    Author : Ali Dorostkar; Maya Neytcheva; Thomas Huckle; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; FEM; Saddle point matrix; Preconditioning; Schur complement; Generalized Locally Toeplitz; Prestressed elasticity; Scientific Computing; Beräkningsvetenskap;

    Abstract : In this work, prestressed elasticity problem as a model of the so-called glacial isostatic adjustment (GIA) process is studied. The model problem is described by a set of partial differential equations (PDE) and discretized with a mixed finite element (FE) formulation. READ MORE

  4. 2. Matrix-Less Methods for Computing Eigenvalues of Large Structured Matrices

    Author : Sven-Erik Ekström; Maya Neytcheva; Stefano Serra-Capizzano; Carlo Garoni; Lothar Reichel; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Toeplitz matrices; eigenvalues; eigenvalue asymptotics; polynomial interpolation; extrapolation; generating function and spectral symbol; Beräkningsvetenskap med inriktning mot numerisk analys; Scientific Computing with specialization in Numerical Analysis;

    Abstract : When modeling natural phenomena with linear partial differential equations, the discretized system of equations is in general represented by a matrix. To solve or analyze these systems, we are often interested in the spectral behavior of these matrices. READ MORE

  5. 3. Developments in preconditioned iterative methods with application to glacial isostatic adjustment models

    Author : Ali Dorostkar; Maya Neytcheva; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Scientific Computing; Beräkningsvetenskap;

    Abstract : This study examines the block lower-triangular preconditioner with element-wise Schur complement as the lower diagonal block applied on matrices arising from an application in geophysics. The element-wise Schur complement is a special approximation of the exact Schur complement that can be constructed in the finite element framework. READ MORE