Search for dissertations about: "polarization"

Showing result 1 - 5 of 576 swedish dissertations containing the word polarization.

  1. 1. Modeling and Compensation of Polarization Effects in Fiber-Optic Communication Systems

    Author : Cristian Bogdan Czegledi; Chalmers University of Technology; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; nonlinear compensation; Channel model; model-based; polarization demultiplexing; polarization-mode dispersion; polarization drift; backpropagation; PMD; DBP;

    Abstract : Optical communication systems that exploit the orthogonality between two polarizations of light convey information over optical fibers by modulating data over the two polarizations. In an idealized scenario, the two polarizations propagate through the fiber without interfering. READ MORE

  2. 2. Media Echo Chambers: Selective Exposure and Confirmation Bias in Media Use, and its Consequences for Political Polarization

    Author : Peter Dahlgren; Göteborgs universitet; Göteborgs universitet; Gothenburg University; []
    Keywords : selective exposure; confirmation bias; political polarization; affective polarization; ideological polarization; political attitudes; political preferences;

    Abstract : The new digital media landscape has created a high-choice media environment that has made it easier for people to find news and information that support their political beliefs and attitudes, and avoid news and information that challenge those beliefs or attitudes. How does this affect people’s selection of content and political polarization in the long run? This thesis investigates the relationship between different political preferences (political party, political interest and ideological leaning) and selective media use over time among the Swedish population, and whether this selectivity leads to political polarization (ideological polarization and affective polarization). READ MORE

  3. 3. Light propagation in an anisotropically scattering medium

    Author : Elena Vasileva; Sergei Popov; Miguel A. Alonso; KTH; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; anisotropic light scattering; scattering material characterization; polarization dependent scattering; diffusive media; hierarchical structure; biocomposites; wood modification; transparent wood; microfibrils angle; organic materials; polymer active devices; dye lasers; coherence; polarization; degree of polarization.; Fysik; Physics;

    Abstract : Scattering is the main phenomenon of light-matter interaction. In this thesis, we consider one specific case of light propagation in a material whose structure causes anisotropic optical scattering - transparent wood. READ MORE

  4. 4. Photospheric emission from structured, relativistic jets : applications to gamma-ray burst spectra and polarization

    Author : Christoffer Lundman; Felix Ryde; Andrei Beloborodov; KTH; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; gamma-ray bursts; photospheric emission; radiative processes; polarization; special relativity;

    Abstract : The radiative mechanism responsible for the prompt gamma-ray burst (GRB) emission remains elusive. For the last decade, optically thin synchrotron emission from shocks internal to the GRB jet appeared to be the most plausible explanation. READ MORE

  5. 5. Mode and Polarization Control in VCSELs using Surface Structures

    Author : Åsa Haglund; Chalmers University of Technology; []
    Keywords : single mode; dynamics; surface relief; Semiconductor laser; polarization; vertical-cavity surface-emitting laser; sub-wavelength grating; fabrication;

    Abstract : The vertical-cavity surface-emitting laser (VCSEL) is a novel, low-cost light source with many attractive performance characteristics, such as low operating current, circular output beam, and high modulation bandwidth at low currents. This together with its easy integration into two-dimensional arrays has made it an established transmitter in short-distance single and parallel fiber-optical links, and new applications are continuously arising. READ MORE