Search for dissertations about: "non-linear systems"

Showing result 1 - 5 of 296 swedish dissertations containing the words non-linear systems.

  2. 1. Non-linear belief revision : Foundations and applications : by John Cantwell

    Author : John Cantwell; Uppsala universitet; []
    Keywords : HUMANIORA; HUMANITIES; Philosophy; Belief revision; iterated belief revision; non-linear belief revision; epistemic entrenchment; plausibility relations; possibility relations; preferential relations; sources of information; contradictory information; non-prioritised belief revision; AGM; Filosofi; Philosophy subjects; Filosofiämnen; teoretisk filosofi; Theoretical Philosophy;

    Abstract : Three structures for belief revision: plausability relations on states, relations of epistemic entrenchment on propositions and systems of spheres (hypertheories), are generalised to the non-linear (non-connected) case. The further generalisation to the case of sets of such structures is also investigated. READ MORE

  4. 2. Non-linear Free Boundary Problems

    Author : Andreas Minne; Henrik Shahgholian; Herbert Koch; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; free boundary; elliptic; fully non-linear; Mathematics; Matematik;

    Abstract : This thesis consists of an introduction and four research papers related to free boundary problems and systems of fully non-linear elliptic equations.Paper A and Paper B prove optimal regularity of solutions to general elliptic and parabolic free boundary problems, where the operators are fully non-linear and convex. READ MORE

  5. 3. Non-Linear Canonical Methods in Strongly Correlated Electron Systems

    Author : Matteo Bazzanella; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Majorana fermions; Emergent Majorana fermions; Non-linear transformation; canonical transformation; Kondo lattice; Mott insulator; Mean-field; Path-integral;

    Abstract : In this thesis some new ideas to perform the analysis of Strongly Correlated Electronic Systems (SCES) are developed. In particular the use of non-linear canonical transformations is considered thoroughly. READ MORE

  6. 4. Theoretical perspectives on ultrafast and non-linear spectroscopy

    Author : Emil Vinas Boström; Matematisk fysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Non-linear optics; Ultrafast dynamics; Non-equilibrium Green s functions; Density functional theory; Multi-photon absorption; Second harmonic generation; Desorption dynamics; Auger decay; Charge-separation dynamics; Quantum Zeno effect; Fysicumarkivet A:2018:Vinas Boström;

    Abstract : In this thesis we discuss a theoretical description of ultrafast and non-linear spectroscopy. Due to the high intensities and ultrashort pulse durations involved in such experiments, it is necessary to use an explicitly time-dependent formalism. READ MORE

  7. 5. Quantum chemical calculations of non-linear optical absorption

    Author : Peter Cronstrand; KTH; []
    Keywords : quantum chemical; non-linear optical; multi-photon absorption;

    Abstract : This thesis represents a quantum chemical treatise ofvarious types of interactions between radiation and molecularsystems, with special emphasis on the nonlinear opticalprocesses of Multi-Photon Absorption and Excited StateAbsorption. Excitation energies, transition dipole moments,two-photon and three-photon tensor elements have beencalculated from different approaches; density functional theoryandab-initiotheory, employing different orders ofcorrelation treatment with the purpose to provide accuratevalues as well as evaluate the quality of the lower ordermethods. READ MORE