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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
81

Geometrinių transformacijų sistema / Geometrical transformation system

Staugaitis, Žygimantas 05 June 2006 (has links)
The main aim of the project is to develop a 2D and 3D geometrical transformation training program. The goal of research is to analyse geometrical transformation practical usage. The existing geometrical transformation systems and new developed system are reviewed. The object oriented design was used to develop a system. 2D and 3D geometrical transformation viewing, task generating and its solving training system was developed.
82

The structure of visual space : the mental rotation of perspective drawings

Niall, Keith. January 1981 (has links)
No description available.
83

Model simplification using image and geometry-based metrics

Lindstrom, Peter January 2000 (has links)
No description available.
84

Functional differential equations and lens design in geometrical optics

Van Brunt, Bruce January 1989 (has links)
The subject of this thesis is lens design using a system of functional differential equations arising from Fermat's Principle in geometrical optics. The emphasis is primarily on existence, uniqueness, and analyticity, properties of solutions to these equations, but some asymptotic methods are developed for special cases. Three specific lens problems are considered in detail: the first is an axial lens having two pairs of foci on the optical axis, the second is an axial lens which focuses light at two different frequencies to two distinct points, the third is a lens symmetric about an axis having foci not on said axis.
85

Simple four-mirror anastigmatic systems with at least one infinite conjugate

Rakich, Andrew January 2007 (has links)
This thesis describes an analytical approach to the optical design of four-mirror anastigmatic optical systems. In all cases investigated here the object is at infinity. In the introduction the field of reflecting, or "catoptric", optical system design is discussed and given some historical context. The concept of the "simplest possible reflecting anastigmat" is raised in connection with Plate Diagram analysis. It is shown that four-plate systems are in general the simplest possible anastigmats, and that four-plate systems comprised of four spherical mirrors are the last family of "simplest possible reflecting anastigmats" for which the complete solution set remains unknown. In chapter 2 third-order aberration coefficients in wavefront measure are derived in a form that is particularly suitable for Plate Diagram analysis. These coefficients are subsequently used to describe the Plate Diagram, and to detail the application of the Plate Diagram to the survey of all possible solutions for four-spherical-mirror anastigmats. The Plate Diagram technique is also generalized to investigate its use as an optical design tool. In the example given a generalized Plate Diagram approach is used to determine solutions for four-mirror anastigmats with a prescribed first-order layout and a minimum number of conicoids. In chapter 3 results are presented for the survey of four-spherical-mirror anastigmats in which all elements are required to be smaller than the primary mirror. Two novel families of four-spherical-mirror anastigmats are presented and these are shown to be the only examples of four-spherical-mirror systems that exist under the given constraints. Chapter 4 gives an example of the application of Plate Diagram analysis to the design of an anastigmatic system with a useful first-order layout and a minimum number of conicoid mirrors. It is shown that systems with useful first-order layouts and only one conicoid mirror can be obtained using this method. In chapter 5 results are presented of the survey of all remaining four-spherical-mirror anastigmatic systems: that is systems in which elements are allowed to exceed the diameter of the entrance pupil, which includes systems with concave and convex primary mirrors. A wide variety of solutions are presented and classified according to both the underlying geometry of the solutions and the first-order layouts. Of these systems only one has been reported in previously published literature. The results presented in this thesis complete the set of "four-plate" reflecting anastigmats, and it can now be said that all possible solutions for four-spherical-mirror anastigmatic systems have been determined.
86

Generalized B-spline surfaces of arbitrary topological type /

Loop, Charles Teorell. January 1992 (has links)
Thesis (Ph. D.)--University of Washington, 1992. / Vita. Includes bibliographical references (leaves [102]-106).
87

Predicting the effects of shadowing and scattering from planar surfaces on localizer course structure using geometrical optics and the uniform theory of diffraction as implemented in the near zone basic scattering code

Rushton, Elliott C. January 1994 (has links)
Thesis (M.S.)--Ohio University, June, 1994. / Title from PDF t.p.
88

Relationship of college student characteristics and inquiry-based geometrical optics instruction to knowledge of image formation with light-ray tracing

Isik, Hakan, January 2008 (has links)
Thesis (Ph. D.)--Ohio State University, 2008. / Title from first page of PDF file. Includes bibliographical references (p. 160-163).
89

The euclidean and hyperbolic geometry underlying M.C. Escher's regular division designs /

Haxhi, Karen Kleinschmidt. January 1998 (has links)
Thesis (M.S.) -- Central Connecticut State University, 1998. / Thesis advisor: Dr. Jeffrey McGowan. "...in partial fulfillment of the requirements for the degree of Master of Science." Includes bibliographical references (leaves [78-79]).
90

Finding intersection curves using subdividable linear efficient function enclosures

Kim, Minho. January 2004 (has links)
Thesis (M.S.)--University of Florida, 2004. / Title from title page of source document. Document formatted into pages; contains 48 pages. Includes vita. Includes bibliographical references.

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