Search for dissertations about: "Solitons"

Showing result 1 - 5 of 52 swedish dissertations containing the word Solitons.

2. 1. Aspects of Yang-Mills Theory : Solitons, Dualities and Spin Chains

   Author : Lisa Freyhult; Antti Niemi; Poul Damgaard; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Theoretical physics; Theoretical Physics; Field theory; String theory; Yang-Mills; Effective models; Supersymmetry; Solitons; Fermion number; Duality; AdS CFT correspondence; Bethe ansatz; Teoretisk fysik; Physics; Fysik;

   Abstract : One of the still big problems in the Standard Model of particle physics is the problem of confinement. Quarks or other coloured particles have never been observed in isolation. Quarks are only observed in colour neutral bound states. The strong interactions are described using a Yang-Mills theory. READ MORE

4. 2. High-efficiency dissipative Kerr solitons in microresonators

   Author : Òskar Bjarki Helgason; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; dissipative Kerr solitons; dissipative solitons; nonlinear optics; microresonators; microcombs; optical frequency combs;

   Abstract : The microresonator comb (microcomb) is a laser source that generates equally spaced coherent lines in the spectral domain. Having a chip-scale size and the potential of being low cost, it has attracted attention in multiple applications. READ MORE

5. 3. Dissipative Kerr solitons in normal dispersion waveguides

   Author : Òskar Bjarki Helgason; Chalmers tekniska högskola; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; optical frequency combs; four-wave mixing; dissipative solitons; microresonators; nonlinear optics;

   Abstract : The microresonator comb (microcomb) is a laser source which generatesequally spaced coherent lines in the spectral domain. Having a miniaturefootprint and the potential of being low cost, it has attracted attention inmultiple applications. READ MORE

6. 4. Generation and Transmission of Optical Solitons at Ultrahigh Bit Rates

   Author : Bamdad Bakhshi; Chalmers tekniska högskola; []
   Keywords : 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;

   Abstract : 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. READ MORE

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

   Author : Martin Lundgren; Antti Niemi; Jørgen Ellegaard Andersen; Uppsala universitet; []
   Keywords : 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;

   Abstract : 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. READ MORE