Search for dissertations about: "focal point"

Showing result 6 - 10 of 92 swedish dissertations containing the words focal point.

  2. 6. MULTIFOCAL SPHERICAL FISH LENSES

    Author : Yakir Gagnon; Biologiska institutionen; []
    Keywords : 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;

    Abstract : 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. READ MORE

  4. 7. A multi-prism lens for hard X-Rays

    Author : Björn Cederström; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; x-ray; optics; refractive; lens; mammography; synchrotron; Physics; Fysik;

    Abstract : This thesis describes a new type of refractive lens for hardx-rays. It is shown that a linear array of prisms, slightlyinclined with respect to the optical axis, will form a linefocus at a certain distance from the lens. Hence, the namemulti-prism lens. READ MORE

  5. 8. Low Rank Matrix Factorization and Relative Pose Problems in Computer Vision

    Author : Fangyuan Jiang; Matematik LTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Geometric Computer Vision; Low-rank Matrix Factorization; Relative Pose;

    Abstract : This thesis is focused on geometric computer vision problems. The first part of the thesis aims at solving one fundamental problem, namely low-rank matrix factorization. We provide several novel insights into the problem. In brief, we characterize, generate, parametrize and solve the minimal problems associated with low-rank matrix factorization. READ MORE

  6. 9. Consumer - Firm Business Relationship and Network : The case of

    Author : David Sörhammar; Amjad Hadjikhani; Bo Edvardsson; Uppsala universitet; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Consumers; Firms; Relationships; Networks; Business studies; Företagsekonomi;

    Abstract : Approximately 20 % of all air-travel tickets in Sweden are sold via the Internet despite consumer’s general perception of ticket prices being lower on the Internet when compared to those available in “traditional” stores. The general aim of this study is to generate a deeper understanding of what induces consumers to conduct their exchanges with firms on the Internet, and what induces most consumers to continue carrying out exchanges in “traditional” stores. READ MORE

  7. 10. A scattering study of concentrated lens protein solutions and mixtures - Towards understanding the molecular origin of presbyopia

    Author : Saskia Bucciarelli; Fysikalisk kemi; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; scattering; eye lens; presbyopia; dynamical arrest; crowding; proteins; dynamics; crystallins;

    Abstract : Healthy eye lenses are transparent and flexible, able to adapt shape in order to focus on far away and close-by objects. With age, however, this flexibility is lost, leading to a condition known as presbyopia. This vision disorder where close-by objects appear blurred commonly starts around the age of 40. READ MORE