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 76 for “"Three-Dimensional Models"”.
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Digital Library Services for Three-Dimensional Models
… and entertainment areas—to work with 3D digital models of the objects with which they deal in their domain. Unfortunately most of these models exist in individual repositories, and are not accessible to geographically distributed professionals who are in need of them.</p> <p>Building an efficient …
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Generating vectors for pop-up cards from three-dimensional models
Pop-up cards are greeting cards that have a three-dimensional representation of an object that, when the card is opened, stands up on its own. Grid-based pop-up cards are the most difficult to design manually due to their complexity and number of pieces that must fit together accurately. In order …
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A thermal analysis tool for three-dimensional models of multilayer microelectronics
… modeling tool for predicting temperatures in three-dimensional multilayer microelectronic packages. It is capable of modeling surface connections (e.g., wire bonds and pins), edge connections (e.g., leads), and thermal vias. A three-dimensional control-volume finite difference method is used, …
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An algebraic reconstruction technique (ART) for the synthesis of three-dimensional models of particle aggregates from projective representations
… task owing to a dearth of quantitative models for describing particle shape and the difficulty of modeling angular particle assemblies. The situation becomes more complex when discrete element analyses of realistic 3-D particle shapes are required. The thesis attempts to address this …
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Three-dimensional object registration using wavelet features
… modeling and data acquisition have brought three-dimensional models to the forefront of computer graphics and visualization research. New data acquisition methods are producing large numbers of models in a variety of fields. Three-dimensional shape-based matching and registration (alignment) …
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Children's drawings of model houses: A developmental study
… (1) the difference between drawings from two and three-dimensional models in terms of projectivity, detail, and proportion; (2) the relative influences of color and line on children's drawings; (3) the difference between multicolored material and monochrome material when children draw a …
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An automated matching algorithm for dual orthogonal fluoroscopy
… images, often by hand, and registration of three-dimensional models with two-dimensional contours. Automation of these processes would greatly accelerate research in this field. This research presents an automated method for recovering the pose of a three dimensional model from planar …
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An implementation of terrain geomorphing in the vertex shader for synthetic planetary surfaces
The purpose of this research is to develop the three-dimensional models of planetary surfaces which can be used in the test environments for the Vision-Based Navigation Systems' (VBNS) terrain recognition and navigation algorithms. The VBNS will fly a trajectory over the planet, taking pictures …
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Model Based Decomposition of MUAPS Into Their Constituent SFEAPS
… SFEAPS. In addition this model was extended to three dimensions. Two-dimensional and three-dimensional models of normal MUAPS consisting of 1, 4, 5, 10 and 50 fibres respectively were developed and decomposed for a small recoding radius up to 5 mm. Also three-dimensional models were developed …
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Finite element modelling of fatigue crack growth in multi-layered architectures
… Element Method in the commercial code ANSYS. Two-dimensional FE analyses studied the effect of shielding and anti-shielding on crack growth in flat strip specimens subjected to three-point bending tests experiencing severe yielding and path deflections. This study was based on Crack Tip Opening …
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Response of a grooved plate subjected to out-of-plane contact loading
… structure. Finite element analysis employing two-dimensional and three-dimensional models is utilized for this investigation via ABAQUS software, a commercial finite element modeling program. The results show that the overall response of a grooved plate subjected to out-of-plane contact loading is …
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A model kit : a system for constructing three-dimensional interactive graphic models
… environment in which one can build and explore three-dimensional models. One can reach directly into this image space to construct a model from a database of components. A stereoscopic video display is combined with a real space by means of a semi-transparent mirror to create this …
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Drawings and their media : means of architectural design exploration and expression
… means which include sketches, drawings, three-dimensional models, and verbal explanations. There have been studies of each of these means, and their respective roles to design . The focus of this study falls in the realm of architectural sketching and drawing. This realm has been studied …
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An evaluation of finite element models of stiffened plates subjected to impulsive loading
Different finite element models are evaluated for two very common structures, a cantilever beam and a stiffened plate, subjected to impulsive loading. For the cantilever beam case, the finite element models are one, two or three dimensional models. Various results from the finite element analyses …
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A solid modeling program for designers
… design changes and additions to a model in a three dimensional sketch like ability. Three dimensional models of paper, clay, wood and other materials have been used to create designs, and aid the designer in making decisions. This type of medium is difficult to make changes, and because of the …
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Thermocapillary convection in laser melted pools during materials processing
… during the laser welding process, both two-dimensional and three-dimensional steady-state finite difference models were developed. The governing mass, momentum, and energy transport equations were discretized using a control volume formulation which incorporated variables mesh and variable …
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Global-local finite element analysis of laminated composites
… the hole. The Global model was analyzed as a two-dimensional problem. The displacements obtained a distance away from the regions of interest in the two-dimensional model were used as imposed boundary conditions to the three-dimensional models of the edges. The results obtained were found to be …
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Investigating the role of trichodesmium spp. in the oceanic nitrogen cycle through observations and models
… and investigated the process using idealized three-dimensional models. Elevated abundances in anticyclones in spring 2011 were correlated with anomalously fresh water connected to river outflow. A bio-optical model based on carbon-normalized nitrogen fixation rates measured in fall 2010 and …
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Technique and application of a non-invasive three dimensional image matching method for the study of total shoulder arthroplasty
… shoulder arthroplasty. First, a non-invasive three dimensional fluoroscopic image matching method was developed and validated for use in the shoulder joint complex. Next, a group of patients that have undergone clinically successful total shoulder arthroplasty surgeries were recruited for …
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Investigation of visual spatial ability and its relation to design methods
… ability and the construction of both two and three dimensional models and previous experience using the skills involved in these two subset subject areas of engineering prototype design. Mechanical engineering undergraduate seniors were given a spatial intelligence test known as the Paper …
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