Sökning: "discrete solitons"

Visar resultat 1 - 5 av 9 avhandlingar innehållade orden discrete solitons.

  1. 1. Bending, Twisting and Turning : Protein Modeling and Visualization from a Gauge-Invariance Viewpoint

    Författare :Martin Lundgren; Antti Niemi; Jørgen Ellegaard Andersen; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; protein folding; discrete frenet frame; solitons; protein visualization; Physics and Astronomy specializing in Theoretical Physics; Fysik och astronomi med inriktning mot teoretisk fysik;

    Sammanfattning : Proteins in nature fold to one dominant native structure. Despite being a heavily studied field, predicting the native structure from the amino acid sequence and modeling the folding process can still be considered unsolved problems. In this thesis I present a new approach to this problem with methods borrowed from theoretical physics. LÄS MER

  3. 2. Spectra and Dynamics of Excitations in Long-Range Correlated Structures

    Författare :Lars Kroon; Rolf Riklund; Magnus Johansson; Jeroen Lamb; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; quasicrystals; deterministic aperiodic superlattices; Markov chains; electronic structure and diffusion; elastic vibrations; Fraunhofer diffraction; discrete solitons; phase transitions; Condensed matter physics; Kondenserade materiens fysik;

    Sammanfattning : Vad karaktäriserar en kristall? Svaret på denna till synes enkla fråga blir kanske att det är en anordning av atomer uppradade i periodiska mönster. Så ordnade strukturer kan studeras genom att det uppträder så kallade Braggtoppar i röntgendiffraktionsmönstret. LÄS MER

  4. 3. Effects of aperiodic order for Josephson junction arrays and discrete breathers

    Författare :Erik Lennholm; Linköpings universitet; []
    Nyckelord :Aperiodic order; Josephson junction array; Discrete breather;

    Sammanfattning : Effects of the combination of nonlinearities and aperiodic order is studied in this thesis. The nonlinear systems considered are Josephson junction arrays (JJA) and Fermi-Pasta-Ulam (FPU) lattices. Both systems are discrete and one-dimensional. The traveling waves in a JJA are solitons, i. LÄS MER

  5. 4. Nonlinear localization in discrete and continuum systems : applications for optical waveguide arrays

    Författare :Michael Öster; Linköpings universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : An introcludion to the formation of coherent structures in spatially discrete and continuous systems is given. Of special interest is the phenomenon of nonlinear localization, where the self-focusing of an excitation is balanced by a dispersive process. LÄS MER

  7. 5. Discrete aperiodically ordered structures in low dimensions

    Författare :Bruno Lindquist; Jens Juul Rasmussen; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : This thesis deals with discrete models for one-dimensional (1D) and two-dimensional (2D) aperiodic systems such as quasicrystals and aperiodic superlattices. Various model systems are investigated using different forms of the tight-binding (TB) approximation. LÄS MER