Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 138 for “"polygonal"”.
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Similarity between polygonal shapes
In this thesis we review existing algorithms for measuring shape similarity between polygons. We present a new approach to measure similarity based on the notion of annular profile. We also present the implementation of three shape measuring algorithms: signature function, turning function, and …
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Wrinkling in polygonal membranes
… needs to mature. In this thesis, regular polygonal membranes tensioned at their vertices are proposed as reflectors; their discrete nature necessitates a lighter support structure compared to circular membranes. Analysis has been made to assess the effect of the wrinkling in these …
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Polygonal finite elements for finite elasticity
… elasticity problems in two dimensions by using polygonal discretizations. To account for incompressible behavior, a general theoretical framework of deriving the two-field variational principle, involving a displacement field and a pressure field, is presented. Within the theoretical framework, …
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Approximating polygonal objects with deformable smooth surfaces
We propose a method to approximate a polygonal object with adeformable smooth surface, namely the t-skin defined byEdelsbrunner for all 0< t < 1. We guarantee that they arehomeomorphic and their Hausdorff distance is at most \epsilon>0.This construction makes it possible for fully automatic, …
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Dynamic Modeling With Implicit Surfaces and Polygonal Meshes
"Morse theory reveals the topological structure of a shape based on the critical points of a real function over the shape. This thesis solves a relaxed form of Laplace's equation to find a ""fair"" Morse function with a user-controlled number and configuration of critical points."
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On the inverse spectral problem for polygonal domains
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1988.
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Modeling Two-Phase Flow and Heat Transfer in Polygonal Microchannels
… problem, we study the heat and mass transfer in polygonal micro heat pipes under small imposed temperature differences. A micro heat pipe, used in electronics cooling, consists of a closed polygonal microchannel filled with a wetting liquid and a long vapor bubble. We model the evaporation, fluid …
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The polygonal chapter house: architecture and society in Gothic Britain
… One such innovation of visual prominence is the polygonal plan for chapter houses.</p> <p>Chapter houses are the board rooms of ecclesiastic foundations. They are usually square or rectangular in plan. Only in England do we find the appearance of a new plan-type, a circle, in the chapter house of …
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Monocular vision based navigation using image moments of polygonal features
… of polygon features. The landmarks we use are polygonal regions instead of a dense set of feature points, which can significantly reduce the computational complexity of data association and produce a map that is geometrically and structurally more meaningful. Each region can be characterized …
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Flexigami : folded polygonal unit cells for deployable metamaterials and mechanisms
Deployable and transformable structures are of broad interest for applications including satellites and space exploration, temporary shelters, packaging, transportation, robotics and medical devices. One emerging approach to scalable fabrication of such structures involves the general concept of …
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Polygonal random fields and the reconstruction of piecewise continuous functions
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1993.
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Stress singularities, annihilations and invisibilities induced by polygonal inclusions in linear elasticity
… response of an in?nite plane containing polygonal and hypocycloidal-shaped voids and rigid inclusions subject to generalized remote loading conditions. The analytical solution obtained for the case of polygonal inclusions shows some unexpected and interesting features such as an in?nite …
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On the geometry and topology of moduli spaces of multi-polygonal linkages
… modulo rotations and translations) of polygonal linkages have been studied by Kapovich, Millson, and Kamiyama, et. al. One can form a polygonal linkage by taking two free linkages and identifying initial and terminal vertices. This can be generalized so that one takes three free …
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Conical flow modeling for polygonal cross section bodies at off design conditions.
Thesis: M.S., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 1977
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The study of surface SHG and polygonal microcavity design for nonlinear applications on LiNbO<sub>3</sub>
… generation (SHG) studies and for the designs of polygonal microcavities for nonlinear applications. <br/><br/>Reflection second harmonic generation (RSHG) experiments were performed on LiNbO<sub>3</sub> to reveal the interfacial layer symmetry as the crystal is rotated around the z axis. RSHG was …
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Modelling the Thermal Dynamics of Polygonal Soil Structures in the Permafrost of the Lena Delta, Northern Siberia
… is extended to simulate the thermal dynamics of polygonal soil structures in an Arctic tundra wetland in Northern Siberia. A two-dimensional model formulation in cylindrical coordinates is implemented and coupled to a surface energy balance model. The model performance is assessed by a comparison …
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Optimization parameters for a membrane polygonal body of revolution with zero meridional stress and its application to parachutes
A polygonal body of revolution consisting of discrete meridional members joined by regular polygons is optimized for maximum drag and drag coefficient. The meridional, or primary members, carryall of the radial loads and the membrane structure transfers applied pressure loads to the primary …
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First principles study of structure and lithium storage in inorganic nanotubes
… to accommodate a coherent interface, but a polygonal cross section could result in a coherent interface with considerably less strain. An energy component model is parameterized with atomistic calculations to compare nanotubes with a circular and polygonal cross section. The model shows that …
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Automatic Updating of Cartographic Databases
… survey control points, well-defined points in polygonal features such as building corners can be used. A prototype system was developed to perform matching of polygonal features and their vertices in vector data files. The system started with information extraction from polygonal features. Two …
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