Sökning: "soliton"

Visar resultat 1 - 5 av 31 avhandlingar innehållade ordet soliton.

  1. 1. Field Theories and Vortices with Nontrivial Geometry

    Författare :Kristel Torokoff; Antti Niemi; Masud Chaichian; Uppsala universitet; []
    Nyckelord :Theoretical physics; theoretical physics; gauge field theory; knot theory; spontaneously broken symmetry; effective model; numerical calculation; soliton; vortex; electromagnetic plasma; Teoretisk fysik;

    Sammanfattning : This thesis investigates aspects of field theories and soliton solutions with nontrivial topology. In particular we explore the following effective models: a limited sector of the scalar Electroweak theory called extended Abelian Higgs model, and a classical mechanics model derived from the low energy SU(2) Yang-Mills theory. LÄS MER

  3. 2. Protein Folding Simulations in Kink Model

    Författare :Xubiao Peng; Antti Niemi; Ulrich Hansmann; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; protein folding; kink model; soliton; Physics with specialization in Biophysics; Fysik med inriktning mot biofysik;

    Sammanfattning : The structure of protein is essentially important for life activities. Proteins can perform their functions only by specific structures. In this thesis, the kink and multi-kink model for protein description are reviewed. LÄS MER

  4. 3. Generation of optical pulses from Erbium-doped fiber ring lasers and their applications in soliton transmission and all-optical sampling

    Författare :Jie Li; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; dispersion-management; pulse generation; temporal resolution; super-mode noise; parametric amplification; timing jitter; mode-locking; fiber ring laser; eye-diagram; soliton robustness; polarization-mode dispersion; all-optical sampling; highly nonlinear fiber;

    Sammanfattning : .... LÄS MER

  5. 4. Soliton Methods in the Theory of Integrable Mechanical Systems

    Författare :Krzysztof Marciniak; Janno Hietarinta; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This dissertation is devoted to the study of integrable sets of mechanical equations with the use of soliton techniques. A Lax representation of the coupled Kortevegde Vries (cKdV) hierarchy with sow-ces is derived. LÄS MER

  7. 5. Generation and Transmission of Optical Solitons at Ultrahigh Bit Rates

    Författare :Bamdad Bakhshi; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; nonlinear optics; chirp-free optical pulses; lowpass filtering; polarization-maintaining fibers; optical communication; optical solitons; Erbium fiber ring laser; dispersion-management; active mode-locking; soliton interactions; erbium-doped fiber amplifier; Gaussian pulses;

    Sammanfattning : This thesis deals with the generation and transmission of optical solitons in ultrahigh-speed fiber-optic communication systems. For optical soliton pulses the fiber dispersion and nonlinearity can under certain circumstances cancel each other, thus allowing the solitons to remain undistorted over long distances. LÄS MER