Search for dissertations about: "equation"

Showing result 11 - 15 of 1504 swedish dissertations containing the word equation.

2. 11. Numerical methods for Sylvester-type matrix equations and nonlinear eigenvalue problems

   Author : Emil Ringh; Elias Jarlebring; Johan Karlsson; Per Enqvist; Daniel Kressner; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Matrix equations; Lyapunov equation; Sylvester equation; nonlinear eigenvalue problems; two-parameter eigenvalue problems; Krylov methods; iterative methods; preconditioning; projection methods; Matrisekvationer; Lyapunovekvationen; Sylvesterekvationen; ickelinjära egenvärdesproblem; två-parameters egenvärdesproblem; Krylovmetoder; iterativa metoder; förkonditionering; projektionsmetoder; Tillämpad matematik och beräkningsmatematik; Applied and Computational Mathematics; Optimization and Systems Theory; Optimeringslära och systemteori; Numerical Analysis; Numerisk analys;

   Abstract : Linear matrix equations and nonlinear eigenvalue problems (NEP) appear in a wide variety of applications in science and engineering. Important special cases of the former are the Lyapunov equation, the Sylvester equation, and their respective generalizations. These appear, e.g. READ MORE

4. 12. Homogenization of some new mathematical models in lubrication theory

   Author : Afonso Fernando Tsandzana; Peter Wall; Lars- Erik Persson; John Fabricius; Anders Holmbom; Luleå tekniska universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; lubrication theory; homogenization theory; Reynolds equation; cavitation; surfaces roughness; Stokes equation; Matematik; Mathematics;

   Abstract : We consider mathematical modeling of thin film flow between two rough surfaces which are in relative motion. For example such flows take place in different kinds of bearings and gears when a lubricant is used to reduce friction and wear between the surfaces. READ MORE

5. 13. Domain Decomposition and Preconditioned Iterative Methods for the Helmholtz Equation

   Author : Elisabeth Larsson; Kurt Otto; Bengt Fornberg; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Helmholtz equation; domain decomposition; preconditioned iterative method; fast transforms; parallelization; Numerical Analysis; Numerisk analys;

   Abstract : New preconditioned iterative solution methods for the Helmholtz equation are constructed. To evaluate the performance of the methods, two-dimensional problems with a waveguide geometry are used as model problems. Second- and fourth-order accurate finite difference discretizations are used. READ MORE

6. 14. The Dynamic Behavior of Prices and Investment: Financial Constraints and Customer Markets

   Author : Magnus Lundin; Nils Gottfries; Robert Chirinko; Uppsala universitet; []
   Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Economics; Customer Markets; Financial Constraints; Price Equation; Investment Equation; User Cost of Capital; Nationalekonomi; Economics; Nationalekonomi;

   Abstract : Chapter II (with Nils Gottfries and Charlotte Bucht) explores the interaction between prices and investment. We construct a dynamic model of a financially constrained firm making pricing and investment decisions. READ MORE

7. 15. Mesoscopic thin film superconductors - A computational framework

   Author : Mikael Håkansson; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Riccati equation; quasiclassical theory; simulation; GPU; time-reversal symmetry; CUDA; Eilenberger equation; coherence functions; Superconductivity; computational;

   Abstract : Motivated by experiments on superconductors in the microscopic regime and the realization of small superconducting devices such as qubits, we initiate a computational project in the form of a numerical simulation package to model and predict the behavior of these type of systems. It is a multidisciplinary endeavor in that it employs theory, computational science, software design, and to some extent new visualization techniques. READ MORE