Sökning: "ultraviolet"

Visar resultat 1 - 5 av 303 avhandlingar innehållade ordet ultraviolet.

  1. 1. Ultraviolet radiation cataract

    Författare :Konstantin Galichanin; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :lens;

    Sammanfattning : Cataract is the leading cause of blindness in the world. Epidemiological and experimental evidence supports a link between mid-range ultraviolet radiation (UVR-B) exposure and the development of cataract. LÄS MER

  3. 2. Ultraviolet vertical-cavity surface-emitting lasers and vertical microcavities for blue lasers

    Författare :Filip Hjort; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; GaN; ultraviolet; microcavity; electrical conductivity; vertical-cavity surface-emitting laser; AlGaN; electrochemical etching; nanostructures; distributed Bragg reflector;

    Sammanfattning : III-nitride materials are used for ultraviolet (UV) and visible light emitters. One such light source is the vertical-cavity surface-emitting laser (VCSEL) that could find applications within areas ranging from sterilization and medical treatment to car headlights and augmented reality displays. LÄS MER

  4. 3. Cataract from ultraviolet radiation

    Författare :Stefan Löfgren; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Cataract; ultraviolet radiation; lens; rat; transmittance; pigment; age; pupil size.;

    Sammanfattning : Cataract is the major cause of low vision and blindness in the world. Epidemiological and experimental studies link cataract to (solar) ultraviolet radiation (UVR) exposure. Current safety limits of UVR exposure are based on animal experiments, but many factors are less well known in UVR cataractogenesis. LÄS MER

  5. 4. Ultraviolet radiation and cornea

    Författare :Alexander Podskochy; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Cornea; UVR; keratocytes; apoptosis; Fas ligand; hyaluronan; biglycan; rabbit; wound healing.;

    Sammanfattning : Background: Acute exposure of the mammalian eye to UVR results in development of photokeratitis after a period of a few hours. Chronic exposure to UVR is associated with an increased risk of several corneal disorders, including pterygium, climatic droplet keratopathy, and climatic proteoglycan stromal keratopathy. LÄS MER

  7. 5. Ultrafast spin, lattice, and electron dynamics in thin metallic films : in the terahertz, near-infrared, and extreme ultraviolet regimes

    Författare :Vivek Unikandanunni; Stefano Bonetti; Andreas Rydh; Jurgen Lindner; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Terahertz; near-infrared; extreme ultraviolet; epitaxial cobalt; transient grating; field emission; gold; platinum; electron-phonon coupling; magneto-crystalline anisotropy; nanoscale dynamics; ultrafast spin dynamics; magnetic inertia; nutation; pump-probe; two-temperature model; Fowler-Nordheim tunneling; fysik; Physics;

    Sammanfattning : In this thesis, we studied the ultrafast spin and electron dynamics triggered by electromagnetic radiation belonging to three different regions of the electromagnetic spectrum, namely terahertz, near-infrared and extreme ultraviolet. By performing pump–probe measurements, we explored the role of the lattice in ultrafast spin and electron dynamics in metallic thin films. LÄS MER