Sökning: "Non linear"

Visar resultat 1 - 5 av 1775 avhandlingar innehållade orden Non linear.

  1. 1. Linear and non-linear dynamics of non-autonomous flows

    Författare :J. Simon Kern; Dan S. Henningson; Ardeshir Hanifi; Peter J. Schmid; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Time-dependent flows; linear stability; non-linear dynamics; Floquet analysis; optimally time-dependent modes; Teknisk mekanik; Engineering Mechanics;

    Sammanfattning : Fluid flows subject to time-dependent external forces or boundary conditions are ubiquitous in biology and technical applications. Whether one considers birds flying by flapping their wings or the gust response of wind turbines, the flow is non-autonomous. LÄS MER

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

    Författare :John Cantwell; Uppsala universitet; []
    Nyckelord :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;

    Sammanfattning : 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. LÄS MER

  4. 3. Non-linear Free Boundary Problems

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

    Sammanfattning : 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. LÄS MER

  5. 4. Non-Linear Spatio-Temporal Dynamics of Optical Beams and Pulses in Kerr and Ionizable Media

    Författare :Manuel López Quiroga Teixeiro; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; self-focussing; wave-breaking; optical Kerr effect; autowaves; fast adiabatic compression; non-linear modes conversion; non-linear optics; blue-shift; solitons; full wave numerical simulations; optical fibers; ionization non-linearities; pulse compressioni;

    Sammanfattning : The present thesis includes results of several investigations concerning the propagation of optical pulses in optical fibers and spatio-temporal beams in optical Kerr media and ionizable media. Both numerical and analytical methods play an important role in the investigations. LÄS MER

  7. 5. Theoretical perspectives on ultrafast and non-linear spectroscopy

    Författare :Emil Vinas Boström; Matematisk fysik; []
    Nyckelord :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;

    Sammanfattning : 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. LÄS MER