Sökning: "refraction"

Visar resultat 21 - 25 av 72 avhandlingar innehållade ordet refraction.

1. 21. View Planning and Refractive Modeling for Structure and Motion

   Författare :Sebastian Haner; Matematik LTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Computer Vision; Structure and Motion; 3D Reconstruction; View Planning; Refractive Modeling;

   Sammanfattning : This thesis presents contributions to structure-and-motion estimation, a central topic in the field of geometric computer vision. In particular, the problem of view planning is considered, and continuous and discrete optimization-based algorithms are given for how to plan the path of a sensor to its destination, while balancing the competing goals of path length and reconstruction accuracy. LÄS MER

3. 22. Structure of Rare-Earth Aluminosilicate Glasses Probed by Solid-State NMR Spectroscopy and Quantum Chemical Calculations

   Författare :Aleksander Jaworski; Mattias Edén; Thibault Charpentier; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fysikalisk kemi; Physical Chemistry;

   Sammanfattning : Aluminosilicate glasses incorporating rare earth elements feature highly beneficial physical and chemical properties, at the level beyond that accessible for compositions based on alkali and/or alkaline earth metals. Extraordinary hardness, high glass transition temperatures and indices of refraction, favorable coefficients of thermal expansion, as well as excellent chemical durability, result in many potential technological applications. LÄS MER

4. 23. A New Model for Assessment of Change in Visual Function in Diabetes

   Författare :Karl-Johan Hellgren; Malmö Institutionen för kliniska vetenskaper; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; diabetic retinopathy; visual function; perimetry;

   Sammanfattning : The purpose of this thesis was to determine whether perimetry using a new model to interpret deterioration or improvement in the visual field can be employed to assess change in visual function over time in diabetes. Diabetic retinopathy has long been considered a microvascular disease, but it is still a matter of debate to what extent diabetes also affects retinal neurons. LÄS MER

5. 24. Refractive surgery with the ArF excimer laser (photorefractive keratectomy) : surgical technique, wound healing and refractive results

   Författare :Heléne Hamberg-Nyström; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :Photorefractive keratectomy; excimer laser; comparison; centration; contrast sensitivity; night vision; endothelial cell; epithelial thickness; multipassmultizone; multizone; haze; saccades; hyaluronan; myopic regression; reoperation; wound healing.;

   Sammanfattning : Excimer lasers have been adapted to treat refractive errors in the human eye since 1987. By remodeling the corneal surface, myopia and astigmatism can be corrected. The investigations herein were performed during a time period when the surgical technique development was extensive. LÄS MER

7. 25. Graded index sonic crystal noise barriers: An introduction to design and optimization

   Författare :Bart van der Aa; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Shape optimal design; Broadband acoustic lens; Optimization; Outdoor sound propagation; Sonic crystal noise barrier; Graded index sonic crystal;

   Sammanfattning : Environmental noise pollution and its impact on human beings remains to be an important topic in acoustics. Conservative estimations of the World Health Organization have shown that traffic related noise alone causes a loss of approximately one million healthy life years, only within Western Europe. LÄS MER