Sökning: "Point Spread Function"

Visar resultat 1 - 5 av 21 avhandlingar innehållade orden Point Spread Function.


    Författare :Yakir Gagnon; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Multifocal Lens; Adaptation; Dispersion; Spherical lens; Model; Fish; Ray-trace; Longitudinal Chromatic Aberration; Longitudinal Spherical Aberration; Modulation Transfer Function; Point Spread Function; Refractive Index Gradient;

    Sammanfattning : Vision is an important source of information for many animals. The lens plays a central role in the visual pathway and hence the ecology of these animals. Fish have spherically shaped crystalline lenses that contain a gradient of refractive index. Like all refracting elements, lens performance depends on the wavelength of the refracted light. LÄS MER

  2. 2. Quasar host galaxies at intermediate and high redshifts

    Författare :Eva Örndahl; Bengt Gustafsson; Jari Kotilainen; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Astronomy; Active galaxies; Quasars; Host galaxies; Imaging; Photometry; Magnitudes; Colours; Morphology; Statistical methods; High-redshift; Infrared; Astronomi; Astronomy and astrophysics; Astronomi och astrofysik; Theoretical Astrophysics; teoretisk astrofysik;

    Sammanfattning : Quasars form one of the most energetic phenomena in the universe, and can be traced out to very large redshifts. By studying the galaxies which host the active nuclei, important insights can be gained into the processes that trigger and maintain the quasar powerhouse. LÄS MER

  3. 3. Manufacture of High Efficiency Surface Relief Computer Generated Holograms

    Författare :Mats Ekberg; Chalmers University of Technology; []
    Nyckelord :; kinoforms;

    Sammanfattning : This thesis treats design, manufacture, evaluation and applications of computer-generated surface relief holograms - kinoforms. These diffractive, phase-only, planar optical components are characterized by high efficiency, design flexibility, light weight and small size. They can further be reproduced at low cost. LÄS MER

  4. 4. Political Turning Points: Rhetorical Analyses of Japanese Inauguration Speeches

    Författare :Pia Moberg; University of Gothenburg; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Rhetoric; rhetorical analysis; inauguration speeches; political communication – Japan; speech-writing; political speeches; Japanese orality; leadership–Japan; turning points – Japan; Japan –prime minister;

    Sammanfattning : After centuries of feudalism, the establishment of the Japanese parliament (the Diet) in 1890 marked a major turning point in Japanese history. Before 1890, politics as a subject of discussion was confined, more or less, to peer groups in Japanese society. LÄS MER

  5. 5. Magnetodynamics of pseudo spin valves investigated using co-planar waveguide and spin torque ferromagnetic resonance techniques

    Författare :Masoumeh Fazlali; Göteborgs universitet; Göteborgs universitet; Gothenburg University; []
    Nyckelord :Spintronics; Nanocontact pseudo spin valve; Spin waves; Oersted field; Interlayer exchange coupling; Acoustic and optical modes; Spin pumping; Spin transfer torque; Slonczewski mode; Collective mode;

    Sammanfattning : Nanocontact spin-torque nano-oscillators (NC-STNOs), based on magnetic multilayers, can generate a wide range of highly nonlinear localized and propagating spin wave modes for use in magnonics. In this thesis, we study some aspects of these structures from the fundamental physics point of view using the spin torque ferromagnetic resonance technique (ST-FMR) and conventional broadband FMR technique. LÄS MER