Дисертації з теми "Shape functional"
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Guo, Li. "Shape blending using discrete curvature-variation functional /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?IEEM%202005%20GUO.
Повний текст джерелаChung, Jinpyung 1967. "Functional requirements to shape generation in CAD." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/29628.
Повний текст джерелаIncludes bibliographical references (p. 119-121).
An outstanding issue in computer-aided design (CAD) is the creation of geometric shapes from the description of functional requirements (FRs). This thesis presents a method that can generate assembled shapes from the given FRs without human intervention. To achieve this goal, the design process follows a V-model of decomposition and integration based on axiomatic design. The V-model consists of three main sub-processes; (1) a top-down decomposition of FRs and design parameters (DPs), (2) mapping of DPs into geometric entities, and (3) a bottom-up integration of the geometric entities. A shape decomposition technique is used in the V-model to generate solid cells from the geometric entities in the CAD models based on FRs. These cells are stored and reused during the integration process. A set of cells mapped to an FR is called a functional geometric feature (FGF) to differentiate it from geometric features defined by only geometric characteristics. Each FGF has mating faces as its pre-defined interfaces. Links of FR-DP-FGF-INTERFACES and their hierarchies are made and stored in the database as fundamental units for automatic assembled shape generation. The retrieval of proper FGF from the database is performed by matching a query FR with stored FRs by a lexical search based on the frequency of words and the sequence of the words in the FR statements using a synonym checking system. The language-matching rate is calculated as a value of FRmetric between 0 and 1. A computer algorithm automatically combines and assembles the retrieved FGFs. Genetic algorithm (GA) searches for the best combination for matching interface types and generates assembly sequences.
(cont.) From the highest-valued chromosome, the computer algorithm automatically assembles FGFs by coordinating, orienting, and positioning with reference to the given mating conditions and calculates geometric interface-ability to a value of INTERFACEmetric between 0 and 1. The higher the values of FRmetric and INTERFACEmetric, the better the generated design solution for the given FRs that must be satisfied. The process of top-down decomposition and bottom-up integration reduces the number of possible combinations of interfacing FGFs. Design matrix visually relates FRs to FGFs. The method presented in this thesis has demonstrated that a "functional CAD" can aid designers in generating conceptual design solutions from functional descriptions, in reusing existing CAD models, and in creating new designs.
by Jinpyung Chung.
Ph.D.
Zhang, Jun. "Shape control in synthesis of functional nanocrystals." Diss., Online access via UMI:, 2009.
Знайти повний текст джерелаAdiguzel, O. "Phase Transition and Functional Characteristics of Shape Memory Alloys." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35059.
Повний текст джерелаLi, Wenhua. "Shape Control and Functional Properties of Copper Chalcogenide Colloidal Nanocrystals." Doctoral thesis, Universitat de Barcelona, 2013. http://hdl.handle.net/10803/131051.
Повний текст джерелаInicialment vam establir les condicions per preparar Cu(x)S. Com a mecanisme de creixement es va proposar el que es coneix amb el nom d’oriented attachment, en el qual els nanocristalls s’uneixen en una determinada orientació per formar altres formes més complexes. Establint les condicions en les quals es donava aquest mecanisme podíem produir nanocristalls de Cu2-xS amb un acurat control sobre la seva composició i/o forma, des de partícules esfèriques fins a nanopartícules en forma de disc o bé acanat amb partícules amb forma tetradecaèdríca o dodecaèdríca. Aquest control es va aconseguir simplement variant la concentració del precursor i les condicions de reacció. El segon sistema que es va estudiar va ser la producció de nanocristalls de Cu(x)Se. En el nostre treball preteniem descobrir nous procediments per sintetitzar nanocristalls de Cu(x)Se controlant la seva morfologia. Es va descubrir que es podia controlar la forma final dels nanocristalls de Cu(x)Se simplement introduint ions metàl•lics a la solució. En particular, en presència d’ions d’alumini es van produir nanocubs amb una longitud lateral de 17 nm ± 0.9 nm. Addicionalment es van estudiar les propietats plasmòniques d’aquests nanocubs. També es van utilizar aquests cubs de seleniur de coure com a base per produir cubs d’altres semiconductors a travès de l’intercanvi catiònic. Com a exemple es van produir cubs de Ag(2)Te. Finalment, es va estudiar el calcogenur binari, Cu(x)Te. Es va desenvolupar un mètode de síntesi per produïr nanocubs, nanoplaques i nanorods altament monodispersos. Es va observar que els paràmetres clau per controlar la forma eren la temperatura i la quantitat de surfactants. En canvi, per controlar el tamany es va observar que el paràmetre més important era la proporció entre Cu i Te present a la solució. Aquests nanocristalls posseïen propietats plasmòniques amb un pic d’absorpció al voltant dels 900 nm.
Paine, Jeffrey Steven Nelson. "Multi-functional SMA hybrid composite materials and their applications /." This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06062008-162936/.
Повний текст джерелаPaulsson, Niklas. "Shape and dynamical consequences of the functional response of Daphnia magna." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-80025.
Повний текст джерелаCorum, Katharine Witkin. "Theoretical discovery of shape reactivity relationships in aluminum nanoclusters." Diss., University of Iowa, 2016. https://ir.uiowa.edu/etd/6718.
Повний текст джерелаYing, Jia. "Structural Change and Its Assessment by Fluorescence Spectroscopy in Functional Polymers." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/192187.
Повний текст джерелаJi, Wei. "Spatial Partitioning and Functional Shape Matched Deformation Algorithm for Interactive Haptic Modeling." Ohio University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1226364059.
Повний текст джерелаFORTINI, ANNALISA. "Functional characterization of thermally activated shape memory alloys for innovative adaptive structures." Doctoral thesis, Università degli studi di Ferrara, 2016. http://hdl.handle.net/11392/2403483.
Повний текст джерелаThe ongoing employment of Shape Memory Alloys (SMAs) as solid-state actuators results from the Shape Memory Effect (SME) and the unique mechanical characteristics of these materials, including high reversible strain (up to 10 %), high-power to weight ratio and the ability to generate high recoverable stresses (up to 800 MPa). SMAs are frequently combined within polymeric materials, also reinforced with embedded fibres, to produce adaptive structures whose properties could be tuned in response to external stimuli. The integration of smart materials in actuation systems represents an excellent technological opportunity and an alternative solution to conventional mechanical systems for the development of mechanisms with improved simplicity and reliability. The possibility to use SMA elements for morphing structures is particularly attractive for aerodynamic applications where this actuation solution prevents the introduction of flow-disturbing control elements. The notion of smart advanced blades, which can control themselves and reduce (or eliminate) the need for an active control system, is a highly attractive solution in blade technology. Despite a large number of publications and patents relating to the employment of SMAs for enhancing aerodynamic and structural efficiency of automotive applications, specific studies on the behaviour of SMA-based morphing blades are not available in literature. The aim of this work is the development and the experimental characterisation of a novel concept of morphing blade, intended for cooling fan of internal combustion engines for earth moving machines. The variable-geometry blade comprises a composite structure made up of a polymeric compound, for the elastically deformable body of the blade, with embedded SMA strips as active elements. To assess the reliability of the SMA strip to provide the proper bending behaviour in the composite structure of the blade, the first phase of the work concerned the experimental characterisation of the NiTi material. The thermal characterisation allows to study the best shape setting parameters (temperature, time and strain) which were experimentally tuned to maximise the SME in the NiTi strip. The recovery behaviour of the SMA material, as a result of the thermally activated solid to solid phase transformations, was assessed by considering the percentage of shape recovery with the increasing number of thermal cycles. The experimental findings enabled to set the proper thermomechanical treatment related to the bending recovery performance of the strip. Starting from the need to evaluate the actuation ability of the NiTi strip when it is indirectly embedded into a polymeric matrix, a proof of concept of composite structure, comprising a single strip and a polymeric compound was design on purpose. The bending ability of the structure was evaluated by means of repeated recovery cycles. Thermal activations were achieved by means of a fluid flow and an airstream flow heating/cooling systems. Acknoledgments The experiments performed on the concept of the single strip composite structure were useful for the development of the morphing blade. The study of its morphing capability was conducted by comparing the behaviour of four different polymeric compounds in order to establish the best compromise between stiffness and deflection behaviour for the intended application. The shape changes of the blade, arising from the SME behaviour of the embedded thermomechanically treated NiTi strips, were experimentally evaluated through a purpose-built wind tunnel, developed to reproduce the actual automotive thermal ramps of the heat exchanger. Experimental findings highlighted the opportunity to generate an innovative passive control system applied to an automotive cooling axial fan wherein the SMA driven activation enables the production of favourable aerodynamic shape changes.
Shin, James. "Shape Memory Elastomers and Fatty Acid Organogelators: Functional Materials from Small Molecule Additives." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1383340291.
Повний текст джерелаPeng, Bangan. "FUNCTIONAL 4D PRINTING BY 3D PRINTING SHAPE MEMORYPOLYMERS VIA MOLECULAR, MORPHOLOGICAL AND GEOMETRICALDESIGNS." University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1605873309517501.
Повний текст джерелаLee, Wing-cheung, and 李永祥. "Functional coatings on Ti-6A1-4V and NiTi shape memory alloy for medical applications." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B4715052X.
Повний текст джерелаpublished_or_final_version
Mechanical Engineering
Master
Master of Philosophy
Hughes, Adam. "Determining the shape of a liquid droplet : from microscopic theory to coarse grained models." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/19985.
Повний текст джерелаPaine, Jeffrey S. "Multi-functional SMA hybrid composite materials and their applications." Diss., Virginia Tech, 1994. http://hdl.handle.net/10919/38219.
Повний текст джерелаPh. D.
Corman, Etienne. "Functional representation of deformable surfaces for geometry processing." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLX075/document.
Повний текст джерелаCreating and understanding deformations of surfaces is a recurring theme in geometry processing. As smooth surfaces can be represented in many ways from point clouds to triangle meshes, one of the challenges is being able to compare or deform consistently discrete shapes independently of their representation. A possible answer is choosing a flexible representation of deformable surfaces that can easily be transported from one structure to another.Toward this goal, the functional map framework proposes to represent maps between surfaces and, to further extents, deformation of surfaces as operators acting on functions. This approach has been recently introduced in geometry processing but has been extensively used in other fields such as differential geometry, operator theory and dynamical systems, to name just a few. The major advantage of such point of view is to deflect challenging problems, such as shape matching and deformation transfer, toward functional analysis whose discretization has been well studied in various cases. This thesis investigates further analysis and novel applications in this framework. Two aspects of the functional representation framework are discussed.First, given two surfaces, we analyze the underlying deformation. One way to do so is by finding correspondences that minimize the global distortion. To complete the analysis we identify the least and most reliable parts of the mapping by a learning procedure. Once spotted, the flaws in the map can be repaired in a smooth way using a consistent representation of tangent vector fields.The second development concerns the reverse problem: given a deformation represented as an operator how to deform a surface accordingly? In a first approach, we analyse a coordinate-free encoding of the intrinsic and extrinsic structure of a surface as functional operator. In this framework a deformed shape can be recovered up to rigid motion by solving a set of convex optimization problems. Second, we consider a linearized version of the previous method enabling us to understand deformation fields as acting on the underlying metric. This allows us to solve challenging problems such as deformation transfer are solved using simple linear systems of equations
Anderson, Ricky D. "A parts classification and coding system utilizing functional and shape characteristics in a matrix-code structure." Ohio : Ohio University, 1992. http://www.ohiolink.edu/etd/view.cgi?ohiou1171483811.
Повний текст джерелаMonastyrsky, G. E., P. Ochin, A. V. Gilchuk, and V. I. Kolomytsev. "Spark plasma sintering the spark-erosion powders of functional alloys." Thesis, Sumy State University, 2011. http://essuir.sumdu.edu.ua/handle/123456789/20798.
Повний текст джерелаHuwe, Johann Reinhold [Verfasser]. "Histogram-Functional-Shape-Methode zur automatischen Schweregradeinteilung von Fibrose und Emphysem an Lungenlappen / Johann Reinhold Huwe." Gießen : Universitätsbibliothek, 2020. http://d-nb.info/1223461874/34.
Повний текст джерелаRusinovn, P. O., J. M. Blednova, and E. Y. Balayev. "Formation of Multi-functional TiNi Surface Layers via High-speed Flame Spraying." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35286.
Повний текст джерелаYu, Jie. "Classification of Genotype and Age of Eyes Using RPE Cell Size and Shape." Digital Archive @ GSU, 2012. http://digitalarchive.gsu.edu/math_theses/118.
Повний текст джерелаRoug-Hellichius, Liselotte. "Babble, grunts and words : a study of phonetic shape and functional use in the beginnings of language /." Stockholm : Department of linguistics, Stockholm University, 1998. http://catalogue.bnf.fr/ark:/12148/cb37684329j.
Повний текст джерелаMara, Kyle Reid. "Evolution of the Hammerhead Cephalofoil: Shape Change, Space Utilization, and Feeding Biomechanics in Hammerhead Sharks (Sphyrnidae)." Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3502.
Повний текст джерелаHuang, Ruqi. "Two contributions to geometric data analysis : filamentary structures approximations, and stability properties of functional approaches for shape comparison." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS559/document.
Повний текст джерелаMassive amounts of data are being generated, collected and processed all the time. A considerable portion of them are sampled from objects with geometric structures. Such objects can be tangible and ubiquitous in our daily life. Inferring the geometric information from such data, however, is not always an obvious task. Moreover, it’s not a rare case that the underlying objects are abstract and of high dimension, where the data inference is more challenging. This thesis studies two problems on geometric data analysis. The first one concerns metric reconstruction for filamentary structures. We in general consider a filamentary structure as a metric space being close to an underlying metric graph, which is not necessarily embedded in some Euclidean spaces. Particularly, by combining the Reeb graph and the Mapper algorithm, we propose a variant of the Reeb graph, which not only faithfully approximates the metric of the filamentary structure but also allows for efficient implementation and convenient visualization of the result. Then we focus on the problem of shape comparison. In this part, we study the stability properties of some recent and promising approaches for shape comparison, which are based on the notion of functional maps. Our results show that these approaches are stable in theory and potential for being used in more general setting such as comparing high-dimensional Riemannian manifolds. Lastly, we propose a pipeline for implementing the functional-maps-based frameworks under our stability analysis on unorganised point cloud data. Though our pipeline is experimental, it undoubtedly extends the range of applications of these frameworks
Litherland, Trevis J. "On the limiting shape of random young tableaux for Markovian words." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26607.
Повний текст джерелаCommittee Chair: Houdre, Christian; Committee Member: Bakhtin, Yuri; Committee Member: Foley, Robert; Committee Member: Koltchinskii, Vladimir; Committee Member: Lifshitz, Mikhail; Committee Member: Matzinger, Heinrich; Committee Member: Popescu, Ionel. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Aubailly, Simon. "From coarse-grained to atomistic molecular modeling : how structure and dynamics shape intra-molecular communication and functional sites in proteins." Thesis, Orléans, 2017. http://www.theses.fr/2017ORLE2002/document.
Повний текст джерелаIn this thesis we have focused on the elusive relation that exists in proteins between theircomplex structures and the even more complex and sophisticated functions that they perform.Based on two different descriptions of proteins, at residue and atomistic scale, one of ouraims was to connect structural indicators computed from the topology of protein scaffoldsto hot spots in proteins such as catalytic sites in enzymes. Another goal of this thesis wasto employ our structure-based tools and set up original simulation scheme to investigate thebasic structural and dynamical determinants of intramolecular communication in proteins.As a first important finding, we have shown how normal mode analysis and specific graph-theoretical approaches lead to the prediction of catalytic sites in enzymes. Moreover, wehave concentrated our attention on an overlooked class of normal modes, that are stronglylocalized at two widely separated locations in protein scaffolds. These bilocalized modesturned out to efficiently mediate energy transfer even across considerable distances (morethan 70 Å). Finally, cooling experiments performed on a protein-water system described atatomic level have unveiled complex cooling-induced spontaneous energy localization patterns,pointing to specific deformation modes of benzene rings as potential energy-storage centers
Russo, Claudio. "Dual-curing thiol-acrylate-epoxy thermosets for functional applications." Doctoral thesis, Universitat Rovira i Virgili, 2021. http://hdl.handle.net/10803/672432.
Повний текст джерелаHoy en día, cada vez más aplicaciones exigen materiales con un diseño complejo, misión complicada en polímeros termoestables, y por ello el curado dual es una herramienta extremamente útil en el diseño de termoestables. El curado dual se obtiene con una combinación de dos procesos de entrecruzamiento de red secuenciales o simultaneo. Los beneficios del procesado dual se basan en su flexibilidad en el procesado y en la posibilidad de mejorar las propiedades del material curado mediante procesados en una etapa o en multi etapas. En este trabajo, desarrollamos un novedoso sistema de doble curado basado en dos reacciones tipo "clic": la adición de tiol-acrilato de Michael (primera etapa) y la reacción tiol-epoxi (segunda etapa). Aprovechando el sistema desarrollado, se demostró que el procesado mediante curado en dos etapas tenía un gran valor potencial en aplicaciones como uniones adhesivas, puesto que permite un control dimensional preciso de la capa adhesiva y una mayor resistencia adhesiva que el curado en un único paso. Finalmente, el sistema de doble curado tiol-acrilato-epoxi se utilizó para desarrollar polímeros de activación eléctrica con memoria de forma. La capacidad de respuesta/activación eléctrica se obtuvo incorporando una lámina eléctricamente conductora en el polímero con memoria de forma obtenido a partir de un sistema tiol-acrilato-epoxi y aprovechando el procesado dual.
Nowadays, more and more applications demand materials with complex shape designs which is a difficult task when working with thermosetting polymers. Dual-curing processing is an extremely valuable tool for thermosets design. It consists in the combination of two sequential of simultaneous crosslinking process. The benefits of dual-curing processing rely on its processing flexibility and the properties enhancement of cured parts by single- or multi-stage scenarios. In this work, we developed a novel dual-curing system based on two “click” reactions: the thiol-acrylate Michael addition (first stage) and thiol-epoxy reaction (second stage). Exploiting the developed system, dual-curing processing was proved to have high potentiality in adhesive bonding application, allowing accurate dimensional control of the adhesive layer and higher adhesive strength than on-step curing. Finally, thiol-acrylate-epoxy dual-curing system was used to develop electroresponsive shape-memory polymers. The electroresponsive ability was obtained incorporating an electrically conductive layer into a thiol-acrylate-epoxy shape-memory polymer taking advantage of the dual-processing. In this design, the direct heating from external sources (i.e., oven) is replaced by a more efficient internal Joule heating produced in the conductive layer when an controlled voltage is applied. The electro activation of the SME resulted in significantly faster recovery and, using a custom-made thermoelectric control, a precise control of the recovery process was achieved
Delyon, Alexandre. "Shape Optimisation Problems Around the Geometry of Branchiopod Eggs." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0123.
Повний текст джерелаIn this thesis we are interested in a problem of mathematics applied to biology. The aim is to explain the shape of the eggs of Eulimnadia, a small animal belonging to the class Branchiopods}, and more precisely the Limnadiidae. Indeed, according to the theory of evolution it is reasonable to think that the shape of living beings or objects derived from living beings is optimized to ensure the survival and expansion of the species in question. To do this we have opted for the inverse modeling method. The latter consists in proposing a biological explanation for the shape of the eggs, then modeling it in the form of a mathematical problem, and more precisely a shape optimisation problem which we try to solve and finally compare the shape obtained to the real one. We have studied two models, one leading to geometry and packing problems, the other to shape optimisation problems in linear elasticity. After the resolution of the first modeling problem, another mathematical question naturally arose to us, and we managed to solve it, resulting in the complete Blaschke-Santalò (A,D,r) diagram. In other words we can answer the following question: given three positive numbers A,D, and r, and it is possible to find a convex set of the plane whose area is equal to A, diameter equal to D, and radius of the inscribed circle equal to r
Mues, Andreas Wilhelm [Verfasser]. "Functional Integration of Floral Plant Traits: Shape and Symmetry, Optical Signal, Reward and Reproduction in the Angiosperm Flower / Andreas Wilhelm Mues." Bonn : Universitäts- und Landesbibliothek Bonn, 2020. http://d-nb.info/1218301872/34.
Повний текст джерелаSchreiner, Fernanda Reis. "Gramática de formas e o mobiliário modular multifuncional : um estudo de caso." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/25890.
Повний текст джерелаThis research associates the Shape Grammar theory (STINY; GIPS, 1972) to modulation principles (Huang, 2000) as to structure a method for predicting the user’s intervention in modular furniture arrays. The research object, the furniture Vertibral, designed by Joseph Keenan, is constituted by a set of four modules, consisting of 12 wood articulated linear frameworks allowing interpenetration (WONG, 1998) for modules arrangement. The research departs from the retrieval of the Vertibral design principles and follows four steps model: a)object’s vocabulary analysis; b)identification and measurement of possible spatial relationships between two modules with matrices organization; c) generation exercise of formal rules and arrays from 232 computed spatial relations with ground plane reference; and d) comparison of produced arrays made for a usability experiment, according to Co-discovery method (KEMP; GELDEREN, 1996 and DUMAS;REDISH, 1993), with spatial relationships computed. The four stages method seems to have lead to a very high degree of success in creating reliable proxys for multi-functional furniture design.
Bernardino, Gabriel. "Computational anatomy as a driver of understanding structural and functional cardiac remodeling." Doctoral thesis, Universitat Pompeu Fabra, 2019. http://hdl.handle.net/10803/668213.
Повний текст джерелаPresentamos un framework de análisis estadístico de forma para identificar remodelado cardiaco teniendo en cuenta la variabilidad natural de cada individuo. Utilizamos este framework en dos aplicaciones clínicas: triatletas e individuos nacidos pequeños-para-su-edad-gestacional (SGA). Identificamos el remodelado cardiaco en el caso de los triatletas: consistente en una dilatación del ventrículo izquierdo y un aumento de la masa miocárdica. En el ventrículo derecho (RV) la dilatación estaba concentrada en el tracto de salida. Este remodelado correlaciona con una mejor respuesta al ejercicio. En el análisis de SGA, encontramos sutiles cambios en el RV que correlacionaban con una peor respuesta al ejercicio. Estos cambios de forma fueron mayores si SGA se encontraba combinada con otros factores de riesgo cardiaco: tabaco y sobrepeso. Finalmente, presentamos una parcelación de la cavidad del RV en 3 subvolumenes para el análisis regional del RV cuando no es posible la correspondencia punto-a-punto.
Moore, Timothy E. "Investigating the functional and adaptive significance of leaf size and shape variation in Jamesbrittenia (Scrophulariaceae (s.s). tribe Manulae) : an experimental and comparative approach." Bachelor's thesis, University of Cape Town, 2007. http://hdl.handle.net/11427/26300.
Повний текст джерелаTelschow, Fabian Joachim Erich [Verfasser], Stephan F. [Akademischer Betreuer] [Gutachter] Huckemann, and Axel [Gutachter] Munk. "Equivariant Functional Shape Analysis in SO(3) with Applications to Gait Analysis / Fabian Joachim Erich Telschow ; Gutachter: Stephan F. Huckemann, Axel Munk ; Betreuer: Stephan F. Huckemann." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2016. http://d-nb.info/1118846907/34.
Повний текст джерелаOliveira, Felipe Gomes de. "Estimação da profundidade por meio da fusão de dados de energia visual de múltiplas câmeras." Universidade Federal do Amazonas, 2011. http://tede.ufam.edu.br/handle/tede/4147.
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This research presents a visual data fusion approach to recover dense depth map from sequences of images. The conventional methods to estimate depth map have many drawbacks with respect to environment illumination changes and camera positioning. We propose a Global optimization data fusion strategy to improve the measurements from stereo and focus depth maps. Di erent from typical stereo and focus fusion techniques, we use a single pair of stereo cameras to acquire series of images scenes without occlusion and illumination constraints. Then, we use Energy Functional fusion to associate the geometric coherence with multiple frames. In order to evaluate the results we de ned a metric using similarity measurements between traditional stereo and the proposed approach. The experiments are performed in real scene images, and the estimated mapping was superior than those found using traditional stereo methods, which demonstrates the good performance and robustness of our approach.
Este trabalho propõe uma abordagem de Fusão de Dados Visuais para estimar a estrutura tridimensional de uma cena a partir de sequências de imagens obtidas por meio de duas ou mais câmeras. Os métodos convencionais para estimar mapas de profundidade apresentam desvantagens relacionadas a mudanças na iluminação do ambiente e posicionamento de câmeras. Por essa razão, foi proposta uma estrategia de Fusão de Dados baseada em minimiza c~ao de energia para aprimorar as medições proporcionadas pela disparidade entre pixels de uma imagem e pela variação de foco. A abordagem proposta faz uso de uma rede distribuída de sensores visuais utilizando um par de câmeras estéreo sem restrições de oclusão ou iluminação no processo de captura de imagens. A função de energia foi usada para integrar múltiplos frames e inferir a coerência geométrica contida na cena. Para avaliar os resultados obtidos foram utilizadas métricas da literatura através de medições de similaridade entre técnicas de estéreo tradicionais e a estrategia desenvolvida. Os experimentos foram conduzidos a partir de imagens de cenas reais, e as informações de profundidade estimadas foram qualitativamente superior que os resultados obtidos pelos métodos tradicionais. Tais informações demonstram a qualidade dos resultados alcançados pela técnica proposta.
Presles, Benoît. "Caractérisation géométrique et morphométrique 3-D par analyse d'image 2-D de distributions dynamiques de particules convexes anisotropes. Application aux processus de cristallisation." Thesis, Saint-Etienne, EMSE, 2011. http://www.theses.fr/2011EMSE0632/document.
Повний текст джерелаSolution crystallization processes are widely used in the process industry as separation and purification operations and are expected to produce solids with desirable properties. The properties concerning the size and the shape are known to have a considerable impact on the final quality of products. Hence, it is of main importance to be able to determine the granulometry of the crystals (CSD) in formation. By using an in situ camera, it is possible to visualize in real time the 2D projections of the 3D particles in the suspension.The projection of a 3D object on a 2D plane necessarily involves a loss of information. Determining the size and the shape of a 3D object from its 2D projections is therefore not easy. This is the main goal of this work: to characterize geometrically and morphometrically 3D objects from their 2D projections. First of all, a method based on the maximum likelihood estimation of the probability density functions of projected geometrical measurements has been developed to estimate the size of 3D convex objects. Then, a stereological shape descriptor based on shape diagrams has been proposed. It enables to characterize the shape of a 3D convex object independently of its size and has notably been used to estimate the value of the anisotropy factors of the 3D convex objects. At last, a combination of the two previous studies has allowed to estimate both the size and the shape of the 3D convex objects. This method has been validated with simulated data, has been compared to a method from the literature and has been used to estimate size distributions of ammonium oxalate particles crystallizing in water that have been compared to other CSD methods
黃美香 and Mee-heung Cecilia Wong. "Shape analysis." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B31211999.
Повний текст джерелаWong, Mee-heung Cecilia. "Shape analysis /." [Hong Kong : University of Hong Kong], 1994. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13637642.
Повний текст джерелаMitra, Saptarshee. "Experimental and numerical characterization of functional properties of sand molds produced by additive manufacturing (3D printing by jet binding) in a fast foundr." Thesis, Paris, ENSAM, 2019. http://www.theses.fr/2019ENAM0043.
Повний текст джерелаNowadays, traditionally manufactured sand molds and cores for metal casting are being progressively replaced by additively processed sand molds in aerospace/automotive industry, facilitating the production of quality cast parts with complex shapes. The type of additive manufacturing technology used to manufacture 3DP parts in foundries is known as powder-binder-jetting process. In this technology, the molds are produced without the use of any kind of additive tools and in a completely automated way using the layer based construction method. One of the most popular binder systems used in the manufacturing of 3DP mold is a furan-based resin binder, which holds the grain particles together. Their amounts and ratios can influence significantly the 3D printed mold properties, affecting casting quality. Therefore, it is essential to characterize the effects process parameters on the functionality of the 3DP molds. In the present work, the mechanical behavior of 3DP sand molds with varying printing process parameters was first investigated, followed by mass transport properties. To do so, a series of three-point bending strength tests, density measurements, porosity measurements and permeability tests were performed on the 3DP molds. Furthermore, the influence of time, temperature and binder volume fraction on the mechanical and mass transport properties was also investigated. Advanced modelling of the pore space was performed by using the reconstructed images provided by X-ray computed tomography, following different steps: X-ray CT scanning of small 3DP mold specimen, 3D volumetric reconstruction of data, numerical simulations for the prediction of permeability from the reconstructed volume, and pore network modelling for the determination of the pore size distribution. Experiments were also designed to investigate the 3D printed molds in terms of mold erosion during metal casting, in order to select the molding parameters to print 3D printed parts not only with good mechanical and mass transport properties but also to minimize the mold erosion during metal casting. Furthermore, a reverse engineering method for determination of the erosion resistance of sand molds has been established, to study the volume of the eroded surface
Zhang, Kaiyu. "Shape-function modelling of horse hoof." Thesis, Loughborough University, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.516221.
Повний текст джерелаGiles, Paul A. "Iterated function systems and shape representation." Thesis, Durham University, 1990. http://etheses.dur.ac.uk/6188/.
Повний текст джерелаJackson, Todd Robert. "The geometric design of functional shapes." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/42610.
Повний текст джерелаRouhani, Mohammad. "Shape Representation and Registration using Implicit Functions." Doctoral thesis, Universitat Autònoma de Barcelona, 2012. http://hdl.handle.net/10803/129637.
Повний текст джерелаShape representation and registration are two important problems in computer vision and graphics. Representing the given cloud of points through an implicit function provides a higher level information describing the data. This representation can be more compact more robust to noise and outliers, hence it can be exploited in different computer vision application. In the first part of this thesis implicit shape representations, including both implicit B-spline and polynomial, are tackled. First, an approximation of a geometric distance is proposed to measure the closeness of the given cloud of points and the implicit surface. The analysis of the proposed distance shows an accurate distance with smooth behavior. The distance by itself is used in a RANSAC based quadratic fitting method. Moreover, since the gradient information of the distance with respect to the surface parameter can be analytically computed, it is used in Levenberg-Marquadt algorithm to refine the surface parameters. In a different approach, an algebraic fitting method is used to represent an object through implicit B-splines. The outcome is a smooth flexible surface and can be represented in different level from coarse to fine. This property has been exploited to solve the registration problem in the second part of the thesis. In the proposed registration technique the model set is replaced with an implicit representation provided in the first part; then, the point-to-point registration is converted to a point-to-model one in a higher level. This registration error can benefit from different distance estimations to speed up the registration process even without need of correspondence search. Finally, the non-rigid registration problem is tackled through a quadratic distance approximation that is based on the curvature information of the model set. This approximation is used in a free form deformation model to update its control lattice. Then it is shown how an accurate distance approximation can benefit non-rigid registration problem.
Praßni, Jörg-Stefan, Timo Ropinski, Jörg Mensmann, and Klaus Hinrichs. "Shape-based Transfer Functions for Volume Visualization." University of Münster, Germany, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-93039.
Повний текст джерелаGuerfi, Malik. "Les polynômes de Laguerre-Hahn affines discrets." Paris 6, 1988. http://www.theses.fr/1988PA066275.
Повний текст джерелаTrey, Baptiste. "Existence et régularité des formes optimales pour des problèmes d'optimisation spectrale Free boundary regularity for a multiphase shape optimization problem. Communications in Partial Dfferential Equations Regularity of optimal sets for some functional involving eigenvalues of an operator in divergence form Existence and regularity of optimal shapes for elliptic operators with drift. Calculus of Variations and Partial Differential Equations." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALM019.
Повний текст джерелаIn this thesis, we study the existence and the regularity of optimal shapes for some spectral optimization problems involving an elliptic operator with Dirichlet boundary condition.First of all, we consider the problem of minimizing the principal eigenvalue of an operator with bounded drift under inclusion and volume constraints.Whether the drift is fixed or not, this problem admits solutions among the class of quasi-open sets, and if the drift is furthermore the gradient of a Lipschitz continuous function, then the solutions are open sets and C^{1,alpha}-regular except on a set of exceptional points.Next, we study in dimension two the regularity of the solutions to a multi-phase optimization problem for the first eigenvalue of the Dirichlet Laplacian.Finally, we focus on the optimal sets for the sum of the first k eigenvalues of an operator in divergence form. We prove that the first k eigenfunctions on an optimal set are Lipschitz continuous so that the optimal sets are open sets, and we then study the regularity of the boundary of the optimal sets
Lei, Thomas T. (Thomas Ting). "Functional design and shade adaptation in Acer species." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=39406.
Повний текст джерелаCowan, Oliver. "The functional ecology of Eastern Rûens Shale Renosterveld." Doctoral thesis, Faculty of Science, 2019. https://hdl.handle.net/11427/31683.
Повний текст джерелаAwrejcewicz, Jan, Lidiya Kurpa, and T. Shmatko. "Vibration of functionally graded shallow shells with complex shape." Thesis, Department of Automation, Biomechanics and Mechatronics, 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/37081.
Повний текст джерелаJohansson, Anders. "Shape functions in calculations of differential scattering cross-sections." Thesis, Uppsala University, Department of Physics and Astronomy, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-126674.
Повний текст джерелаTwo new methods for calculating the double differential scattering cross-section (DDSCS) in electron energy loss spectroscopy (EELS) have been developed, allowing for simulations of sample geometries which have been unavailable to earlier methods of calculation. The new methods concerns the calculations of the thickness function of the DDSCS. Earlier programs have used an analytic approximation of a sum over the lattice vectors of the sample that is valid for samples with parallel entrance and exit surfaces.The first of the new methods carries out the sum explicitly, first identifying the unit cells illuminated by the electron beam, which are the ones needed to be summed over. The second uses an approach with Fourier transforms, yielding a final expression containing the shape amplitude, the Fourier transform of the shape function defining the shape of the electron beam inside the sample. Approximating the shape with a polyhedron, one can quickly calculate the shape amplitude as sums over it’s faces and edges. The first method gives fast calculations for small samples or beams, when the number of illuminated unit cells is small. The second is more efficient in the case of large beams or samples, as the number of faces and edges of the polyhedron used in the calculation of the shape amplitude does not need to be increased much for large beams. A simulation of the DDSCS for magnetite has been performed, yielding diffraction patterns for the L3 edge of the three Fe atoms in its basis.