Search for dissertations about: "equation"

Showing result 21 - 25 of 1504 swedish dissertations containing the word equation.

  2. 21. Non-linear structural equation models : simulation studies of the Kenny-Judd model

    Author : Fan Yang Jonsson; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Statistics; Statistik;

    Abstract : .... READ MORE

  4. 22. Two Problems on Existence and Approximation Related to the Boltzmann Equation

    Author : Vladislav Panferov; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Boltzmann equation; Povzner type models; diffuse reflection; discrete-velocity models; existence for large data; weak compactness; consistency; convergence; diffuse reflection;

    Abstract : In this thesis, two different types of problems related to the Boltzmann equation of kinetic theory are studied. The first part is devoted to establishing consistency and convergence for discrete-velocity models of the Boltzmann equation. For a new such model, introduced by the author jointly with A. READ MORE

  5. 23. High Order Symmetric Finite Difference Schemes for the Acoustic Wave Equation

    Author : Abraham Zemui; Bertil Gustafsson; Leif Abrahamsson; Per Weinerfelt; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; finite element method; mass lumping; high order; finite difference method; wave equation; Numerical Analysis; Numerisk analys;

    Abstract : When someone speaks, or when a piano is played, sound waves are spread through the room. Physically the propagation of sound is governed by the acoustic wave equation. This thesis deals with the problem of finding solutions to this equation by numerical methods. READ MORE

  6. 24. A Fast Method for Solving the Helmholtz Equation Based on Wave Splitting

    Author : Jelena Popovic; Olof Runborg; Elisabeth Larsson; KTH; []
    Keywords : Helmholtz equation; high fequency waves;

    Abstract : In this thesis, we propose and analyze a fast method for computing the solution of the Helmholtz equation in a bounded domain with a variable wave speed function. The method is based on wave splitting. The Helmholtz equation is first split into one--way wave equations which are then solved iteratively for a given tolerance. READ MORE

  7. 25. Developments in the theory of the Prigogine-Herman kinetic equation of vehicular traffic

    Author : Alexandros Sopasakis; Partiella differentialekvationer; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Chapman-Enskog expansion; Traffic; Prigogine-Herman; Kinetic equation; Unstable flow;

    Abstract : The nonlinear kinetic equation of Prigogine and Herman is examined in regards to existence and uniqueness of solutions. The solution exists and is unique in the Banach space of bounded continuous functions over a particular subspace Ω. READ MORE