Sökning: "refraction"

Visar resultat 1 - 5 av 62 avhandlingar innehållade ordet refraction.

  1. 1. Dispersion Engineering Negative Refraction and Designed Surface Plasmons in Periodic Structures

    Detta är en avhandling från Stockholm : KTH

    Författare :Zhichao Ruan; KTH.; [2007]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; photonic crystal; dispersion property; negative refraction; surface plasmon polariton; designed surface plasmon; negative index material; layer-KKR method; finite-difference time-domain method; plane wave method; subwavelength imaging; open cavity; enhanced transmission; slowing light; TECHNOLOGY Electrical engineering; electronics and photonics Photonics; TEKNIKVETENSKAP Elektroteknik; elektronik och fotonik Fotonik;

    Sammanfattning : The dispersion property of periodic structures is a hot research topic in the last decade. By exploiting dispersion properties, one can manipulate the propagation of electromagnetic waves, and produce effects that do not exist in conventional materials. LÄS MER

  2. 2. Glaucoma Characteristics and Risk Factors - Results from Malmö Eye Survey

    Detta är en avhandling från Department of Ophthalmology, Lund University

    Författare :Kirsti Grødum; [2004]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; vascular disease; Ophtalmology; Oftalmologi; myopia; optic disc hemorrhages; mortality; refraction; glaucoma; population screening;

    Sammanfattning : This thesis is based on data from a large glaucoma screening, comprising 32, 918 elderly citizens of Malmö and data from retrospective analysis of glaucoma patients’ charts from the Eye Department of Malmö University Hospital. The definition of glaucoma was based on reproducible visual field defects and/or glaucomatous optic nerve head damage in both groups. LÄS MER

  3. 3. Wind Turbine Sound Propagation in the Atmospheric Boundary Layer

    Detta är en avhandling från Uppsala : Geotryckeriet

    Författare :Olof Öhlund; Uppsala universitet.; [2014]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Wind turbine sound; atmospheric effects; outdoor sound propagation; refraction;

    Sammanfattning : Wind turbines have grown both in size and number in the past decades. The taller turbines has made it possible to place them in forest areas which is fortunate for a country like Sweden with lots of forest. An issue with wind turbines is the sound they produce. The sound mainly comes from the rotor blades when they pass through the air. LÄS MER

  4. 4. Short- and Long-Term Follow-Up of Ophthalmological Findings in Preterm Infants and Children

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Eva Larsson; Uppsala universitet.; [2004]
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Ophtalmology; prematurity; follow-up; retinopathy of prematurity; ROP; infants; children; incidence; screening; refraction; visual acuity; visual fields; Oftalmiatrik; MEDICINE Physiology and pharmacology Ophtalmology; MEDICIN Fysiologi och farmakologi Oftalmologi;

    Sammanfattning : In a prospective population-based study in Stockholm County, 1998-2000, the incidence of retinopathy of prematurity (ROP) was investigated and was found to be 36% in prematurely-born infants with a birth weight of ≤ 1500 grams. Compared to a study performed ten years ago, the overall incidence was unchanged, but was reduced in “mature” infants and increased in immature ones. LÄS MER

  5. 5. On diode-pumped solid-state lasers

    Detta är en avhandling från Stockholm : KTH

    Författare :Jonas Hellström; KTH.; [2007]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; near-infrared lasers; end-pumped lasers; Q-switching; erbium; ytterbium; GdCOB; KGW; KYW; Co:MALO; laser materials; thermal lensing; end-pumping; spectroscopy; conical refraction; volume Bragg gratings; holographic gratings; laser tuning; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik;

    Sammanfattning : The research that is presented in this thesis can be divided into two major parts. The first part concerns longitudinally pumped, bulk Er-Yb lasers. In these lasers, the main limitation is the thermal shortcomings of the phosphate glass host material. LÄS MER