Search for dissertations about: "variational states"

Showing result 1 - 5 of 14 swedish dissertations containing the words variational states.

  1. 1. Renormalization groups and variational states in an interacting 1D quantum model

    Author : Stefan Rommer; [1996]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Heisenberg model; variational states; DMGR;

    Abstract : .... READ MORE

  2. 2. Resonant states in modulation-doped heterostructures

    University dissertation from Anders Blom, Sölvegatan 14 A, S-223 62 Lund, Sweden

    Author : Anders Blom; [2003]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Mathematical and general theoretical physics; generation-recombination noise; THz laser; classical mechanics; relativity; quantum mechanics; statistisk fysik; gravitation; relativitet; kvantmekanik; klassisk mekanik; Matematisk och allmän teoretisk fysik; thermodynamics; termodynamik; statistical physics; donor energies; Si SiGe quantum well; central-cell effect; impurity absorption; Fysicumarkivet A:2003:Blom; Resonant states; impurity levels;

    Abstract : This thesis deals with the properties of donors placed inside or outside a heterostructure quantum well (QW). The focus of the investigation has been on the formation of resonant states, which are a hybridization of the discrete localized impurity levels and the continuous two-dimensional QW subbands. READ MORE

  3. 3. Numerical renormalization group methods

    University dissertation from Anders Blom, Sölvegatan 14 A, S-223 62 Lund, Sweden

    Author : Martin Andersson; [1999]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; DMRG; renormalization groups; variational states;

    Abstract : .... READ MORE

  4. 4. Four-Body Treatment of the Hydrogen-Antihydrogen System

    University dissertation from Uppsala : Uppsala universitet

    Author : Henrik Stegeby; Piotr Froelich; Alejandro Saenz; [2012]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Antimatter; antihydrogen; four-body system; Adiabatic approximation; Born-Oppenheimer; elastic scattering; stabilization method; resonance states; coupled arrangement channels; coupled rearrangement channels; Gaussian Expansion Method; Antimateria; antiväte; fyrkroppars system; adiabatisk approximation; stabilisationsmetoden; resonanstillstånd; spridningstillstånd; kopplade arrangemangskanaler; Quantum Chemistry; Kvantkemi;

    Abstract : This thesis presents a nonadiabatic (4-body) description of the hydrogen-antihydrogen system at a nonrelativistic level. The properties of the system, the rearrangement processes and the possible existence of resonance states are investigated by using a variational method for coupled arrangement channels, the Gaussian Expansion Method, and the stabilization method. READ MORE

  5. 5. Adaptive Finite Element Methods for Optimal Control Problems

    University dissertation from Göteborg : Chalmers University of Technology

    Author : Karin Kraft; Göteborgs universitet.; Gothenburg University.; [2011]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; finite element method; discontinuous Galerkin method; optimal control; a posteriori error estimate; dual weighted residual; adaptive; multilevel algorithm; Newton method; control constraint; variational inequality; vehicle dynamics.; dual weighted residual; optimal control; Newton method; variational inequality; discontinuous Galerkin method; adaptive; vehicle dynamics.; a posteriori error estimate; control constraint; multilevel algorithm;

    Abstract : In this thesis we study the numerical solution of optimal control problems. The problems considered consist of a systemof differential equations, the state equations, which are governed bya control variable. The goal is to determine the states and controls which minimize a given cost functional. READ MORE