Search for dissertations about: "phase space"

Showing result 1 - 5 of 468 swedish dissertations containing the words phase space.

2. 1. Phase space methods for computing creeping rays

   Author : Mohammad Motamed; Olof Runborg; Sverker Holmgren; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Creeping Rays; Phase Space Methods; High Frequency Wave Scattering Problems; Numerical analysis; Numerisk analys;

   Abstract : This thesis concerns the numerical simulation of creeping rays and their contribution to high frequency scattering problems. Creeping rays are a type of diffracted rays which are generated at the shadow line of the scatterer and propagate along geodesic paths on the scatterer surface. READ MORE

4. 2. Serially Concatenated Space-Time Coded Continuous Phase Modulation

   Author : Dhammika Bokolamulla; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; serially concatenated codes; symbol-by-symbol {MAP} detection; factor graphs; sum-product algorithm; Iterative detection; multiuser detection; space-time codes; continuous phase modulation;

   Abstract : Certain problems associated with reliable digital wireless communication over a frequency-flat slow Rayleigh fadingchannel are treated, when the transmitted signal is modulated using continuous phase modulation (CPM) due to the desirable properties of CPM. The primary focus of attention is on detection strategies, and the thesis proposes iterative detection algorithms for CPM signals transmitted over frequency-flat slow Rayleigh fading channels. READ MORE

5. 3. Phase-Noise Compensation for Space-Division Multiplexed Multicore Fiber Transmission

   Author : Arni Alfredsson; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; detection; estimation; space-division multiplexing.; phase noise; multicore fiber; Coherent fiber-optic communications;

   Abstract : The advancements of popular Internet-based services such as social media, virtual reality, and cloud computing constantly drive vendors and operators to increase the throughput of the Internet backbone formed by fiber-optic communication systems. Due to this, space-division multiplexing (SDM) has surfaced as an appealing technology that presents an opportunity to upscale optical networks in a cost-efficient manner. READ MORE

6. 4. Explorations of University Physics in Abstract Contexts : From de Sitter Space to Learning Space

   Author : Daniel Domert; Cedric Linder; Ulf Danielsson; Duncan Fraser; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physics; phenomenography; cosmology; de Sitter space; quantum mechanics; conceptual understanding; epistemology; physics equations; Fysik; Physics; Fysik; Physics with specialization in Physics Education; Fysik med inriktning mot fysikens didaktik;

   Abstract : This is a thesis which contributes to research in two different fields: theoretical physics and physics education research. The common link between these two research areas is that both involve explorations of abstract physics and mathematical representations, but from different perspectives. READ MORE

7. 5. Diving Deep into Saturn's Equatorial Ionosphere with Cassini : Insights from the Grand Finale

   Author : Joshua Dreyer; Erik Vigren; Michiko Morooka; Jan-Erik Wahlund; Ingo Müller-Wodarg; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Saturn; Cassini; Grand Finale; Ionosphere; Photochemistry; Planetary Rings; Planetary Science; Space Plasma; Space Physics; Fysik med inriktning mot rymd- och plasmafysik; Physics with specialization in Space and Plasma Physics;

   Abstract : In the summer of 2017, the Cassini mission concluded its nearly 13 years orbiting Saturn with a series of daring dives between the rings and the upper reaches of Saturn's atmosphere. This last phase of the mission, called the Grand Finale, revealed a highly variable equatorial ionosphere dominated by a large influx of ring material from Saturn's D ring. READ MORE