Dissertations / Theses on the topic 'Surface normale'
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Snoussi, Jawad. "Limites d'espaces tangents à une surface normale." Aix-Marseille 1, 1998. http://www.theses.fr/1998AIX11037.
Full textRoman, Adriana. "Méthodes d'indentation normale et transverse appliquées à l'étude des propriétés mécaniques des films et révêtements." Lille 1, 2000. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2000/50376-2000-276.pdf.
Full textMaritaud, Karl. "Rendu réaliste d'arbres vus de près en images de synthèse." Limoges, 2003. http://aurore.unilim.fr/theses/nxfile/default/26d2f3b6-ee12-4232-956d-706abdfbda53/blobholder:0/2003LIMO0049.pdf.
Full textMost of the research in the rendering of trees in Computer Graphics has focused on methods designed for viewpoints at a certain distance where the details of the bark and leaves are not perceptible. Rendering realistic trees at a short distance remains an open and difficult problem, essentially due to the visual complexity of bark textures. Here, image-based methods are proposed to extract the relief and color from a single photograph of real bark texture, without any complicated manipulations, and then to automatically synthesize realistic 3D bark textures. A method is proposed to apply these textures, with neither repetition nor discontinuities on the texture, onto branches modeled by displacement-mapped implicit surfaces, which are blended without bulge. Moreover, a technique for extracting the relief of leaf veins is proposed. Together, these methods allow us to achieve a high degree of visual realism for rendering close-up views of trees
Margirier, Audrey. "Tectonique et processus d’exhumation des Cordillères Blanche et Noire en contexte de subduction horizontale (Nord Pérou)." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAU023/document.
Full textMy thesis focuses on the mechanisms that controlled the uplift and construction of the relief in the northern Peruvian Andes. In this area, the Cordillera Blanca forms the highest peaks in Peru (> 6000 m), which is a topographic anomaly across the Andes. The morphology of the Cordillera Blanca is marked by an elongated pluton, which outcrops over 150 km. In addition, this pluton is bordered by the largest normal fault from South America. The presence of this major normal fault in a flat-slab context remains surprising because flat slabs usually induce an increase of the shortening in the overriding plate. The aim of my work is to characterize the variations of the regional stress field, the age of the uplift and discuss the geodynamic processes that contributed to relief building. To address these issues, I used a multidisciplinary approach involving new field data, their analysis and modeling.My microtectonic dataset reveals regional extension above the Peruvian flat-slab. This data contradicts the expected increase of shortening in the overriding plate. Modeling my new thermochronologic data shows an increase in the exhumation rates induced by the uplift of the Cordillera Occidental since 15 Ma. I propose that the regional uplift relates to the flattening of the subduction and associated dynamic topography.To address the impact of the Miocene arc on the uplift at a more local scale, I compiled the cooling ages of the pluton available in the literature. In parallel, I obtained the first amphibole thermo-barometry data that constrains emplacement depth of the Cordillera Blanca batholith. Following these data, I propose that the batholith is structured in eastward-tilted sills. In addition, modeling of the space and time variations of erosion rates based on the inversion of thermochronologic data indicates that erosion rates significantly increased in the Cordillera Blanca since 2 Ma. The Miocene arc seems to insignificantly contribute to the local uplift despite its contribution to the thickening of the lithosphere. Thus, I suggest that the recent glacial erosion contributes to the exhumation of the Cordillera Blanca and subsequent tilting of the batholith.Then, I modeled the landscape evolution for the Cordillera Blanca region to quantify the contribution of erosion in the relief building and the uplift. My numerical models (FastScape) evidence the importance of erosion and associated flexural rebound in fostering relief building and the uplift rates.Finally, based on all available data, I propose a new regional model to explain the Cordillera Blanca normal fault. This model implies an extrado normal fault and erosion of the footwall
Valibouse, Pierre. "Mesure des caractéristiques intrinsèques des matériaux dans l'eau, avec un tube à impédance en incidence normale." Compiègne, 1990. http://www.theses.fr/1990COMPD317.
Full textEnaim, Mohammed. "Etude de la co-forgeabilité d'u multi-matériau : application à un coupe d'acier." Thesis, Paris, ENSAM, 2019. http://www.theses.fr/2019ENAM0002/document.
Full textThe multi-material forging is a forming process allowing, simultaneously, the welding and shaping of multi-material parts with the right material at the right place. The purpose of the presented work is to identify the necessary conditions to obtain a metallurgical bond during forming between two different grades of steel. First, the state of the art allowed the identification of the physical phenomena occurring during multi-material forging and the determination of the key parameters of the bonding which are the contact pressure and the surface expansion at the both sides of the interface. The mechanisms to establish metallurgical bond by forging are based on the breaking and the dispersion of the oxide layer at the interface then the extrusion of the soft material through the voids generated between the oxide fragments. Second, the characterization methodology of this work is presented. It consists of three “simple” forming tests leading to different interface conditions (contact pressure and surface expansion). The first simulations allow the design of the experimental plan for each test. The comparison between simulations and experiments allows the identification of physical parameters of the simulation. Then, the contact pressure and the surface expansion of the identified simulations are used to analyze the metallographic structure and the bonding at the interface.The developed work confirms the major effect of the contact pressure and the surface expansion on the establishment of a metallurgical bond during multi-material forming. The size and the shape of the oxide particles seem to depend on the thermomechanical path at the interface
Li, Huibin. "Towards three-dimensional face recognition in the real." Phd thesis, Ecole Centrale de Lyon, 2013. http://tel.archives-ouvertes.fr/tel-00998798.
Full textMesmay, Arnaud de. "Topics in low-dimensional computational topology." Paris, École normale supérieure, 2014. https://theses.hal.science/tel-04462650v1.
Full textTopology is the area of mathematics investigating the qualitative properties of shapes and spaces. Although it has been a classical field of study for more than a century, it only appeared recently that being able to compute the topological features of various spaces might be of great value for many applications. This idea forms the core of the blossoming field of computational topology, to which this work belongs. The three contributions of this thesis deal with the development and the study of topological algorithms to compute deformations and decompositions of low-dimensional objects, such as graphs, surfaces or 3-manifolds. The first question we tackle concerns deformations: how can one test whether two graphs embedded on the same surface are isotopic, i. E. , whether one can be deformed continuously into the other? This kind of problems is relevant to practical problems arising with morphings or geographic information systems, for example. Relying on hyperbolic geometry and ideas from the theory of mapping class groups, we first establish a combinatorial criterion to characterize isotopy, reproving and strengthening a result of Ladegaillerie (1984). Combined with earlier algorithms on the homotopy of curves, this allows us in turn to provide efficient algorithms to solve this graph isotopy problem. We then shift our focus to decompositions, by investigating how to cut surfaces along curves or graphs with prescribed topological properties, which is an important routine in graph algorithms or computer graphics, amongst others domains. By establishing a strong connection with the continuous setting, as well as studying a discrete model for random surfaces, we improve the best known bounds for several instances of this problem. In particular, this proves a conjecture of Przytycka and Przytycki from 1993, and one of our new bounds readily translates into an algorithm to compute short pants decompositions. Finally, we move up one dimension, where the best known algorithms for many topological problems, like for example unknot recognition, are exponential. Most of these algorithms rely on normal surfaces, a ubiquitous tool to study the surfaces embedded in a 3-manifold. We investigate a relaxation of this notion called immersed normal surfaces, whose more convenient algebraic structure makes them good candidates to solve topological problems in polynomial time. We show that when working with immersed normal surfaces, a natural problem on the detection of singularities arises, and we prove it to be NP-hard – this is noteworthy as hardness results are very scarce in 3-dimensional topology. Our reduction works by establishing a connection with a restricted class of constraint satisfaction problems which has been partially classified by Feder
Valdivia, Paola Tatiana Llerena. "Correção de normais para suavização de nuvens de pontos." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-19032014-145046/.
Full textIn the last years, surface denoising is a subject of intensive research in geometry processing. Most of the recent approaches for mesh denoising use a twostep scheme: normal filtering followed by a point updating step to match the corrected normals. In this work, we propose an adaptation of such two-step approaches for point-based surfaces, exploring three different weight schemes for filtering normals. Moreover, we also investigate three techniques for normal estimation, analyzing the impact of each normal estimation method in the whole point-set smoothing process. Towards a quantitative analysis, in addition to conventional visual comparison, we evaluate the effectiveness of different choices of implementation using two measures, comparing our results against state-of-art point-based denoising techniques. Keywords: surface smoothing; point-based surface; normal estimation; normal filtering.
Lootens, Didier. "Ciments et suspensions concentrées modèles : écoulement, encombrement et floculation." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2004. http://tel.archives-ouvertes.fr/tel-00007217.
Full textSzilárd, Ágnes. "Resolution graphs of normal surface singularities /." The Ohio State University, 1999. http://rave.ohiolink.edu/etdc/view?acc_num=osu148819010987053.
Full textMoore, Kathleen Dorothy. "The Impact of Surface Normals on Appearance." W&M ScholarWorks, 2016. https://scholarworks.wm.edu/etd/1477068344.
Full textSpring, F. A. "Surface glycoproteins of normal and leukaemic leucocytes." Thesis, University of Bristol, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370674.
Full textFriedel, Ilja Heinrich Schröder Peter. "Approximation of surfaces by normal meshes /." Diss., Pasadena, Calif. : California Institute of Technology, 2005. http://resolver.caltech.edu/CaltechETD:etd-05242005-164959.
Full textCico, Alba. "Molecular mechanisms of normal erythropoiesis." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCC311.
Full textEvery second about 2 million erythrocytes are produced in the adult human body, through a process called erythropoiesis. Erythropoiesis is controlled by a highly regulated balance between proliferation and differentiation. Expression of genes responsible for cell proliferation and differentiation is controlled external (such as cytokines) and internal (such as metabolic microenvironment and transcription factors). Transcription factors bind DNA and recruit co-factors generating transcriptional complexes. The LDB1 complex has a key role in the balance between erythroid proliferation vs. differentiation, since it regulates genes involved in both processes. During my Ph.D., we investigated the molecular mechanisms that LDB1 employs to regulate genes with divergent function. We first showed that in erythroid progenitors, differentiating genes, also known as erythroid markers, are primed. Gene priming consists of genes expressed in low basal but significant levels in progenitors, which can rapidly be activated during differentiation. We showed that in progenitors, ETO2, IRF2BP2 and NCOR1, bind the LDB1 complex therefore generating a priming complex. During differentiation, binding of the repressive (ETO2-IRF2BP2-NCOR1) co-factors to the LDB1 complex, is destabilized and genes become active. In genes involved in erythroid proliferation, we observed that LDB1 is destabilized, a feature leading to gene silencing. We used Myb, as a model of gene silencing in the context of regulation by the LDB1 complex. We tested three transcription factors: ZEB1, OGT and RNF12, as candidates in gene silencing. Among these factors, only RNF12 regulates Myb expression, probably through modifications of epigenetic silencers (Polycomb/MLL)
König, Sören, and Stefan Gumhold. "Robust Surface Triangulation of Points with Normal Information." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-131385.
Full textKönig, Sören, and Stefan Gumhold. "Robust Surface Triangulation of Points with Normal Information." Technische Universität Dresden, 2013. https://tud.qucosa.de/id/qucosa%3A27382.
Full textHillis, Graham S. "Cell surface markers in normal and diseased kidney." Thesis, University of Aberdeen, 1997. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU602001.
Full textRieux, Frédéric. "Processus de diffusion discret : opérateur laplacien appliqué à l'étude de surfaces." Thesis, Montpellier 2, 2012. http://www.theses.fr/2012MON20201/document.
Full textThe context of discrete geometry is in Zn. We propose to discribe discrete curves and surfaces composed of voxels: how to compute classical notions of analysis as tangent and normals ? Computation of data on discrete curves use average mask. A large amount of works proposed to study the pertinence of those masks. We propose to compute an average mask based on random walk. A random walk starting from a point of a curve or a surface, allow to give a weight, the time passed on each point. This kernel allow us to compute average and derivative. The studied of this digital process allow us to recover classical notions of geometry on meshes surfaces, and give accuracy estimator of tangent and curvature. We propose a large field of applications of this approach recovering classical tools using in transversal communauty of discrete geometry, with a same theorical base
Ceolin, Simone Regina. "Facial shape space using statistical models from surface normals." Thesis, University of York, 2012. http://etheses.whiterose.ac.uk/2087/.
Full textDunlop, Iain Edward. "Normal and shear forces between surface-grown polyelectrolyte brushes." Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426408.
Full textVits, Lucia Carolina. "Biochemical Characterization of Normal Navicular Bone Flexor Surface Cartilage." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/35755.
Full textSignificant differences were determined between the water content of the navicular bone flexor surface cartilage (68.32± 3.46 % ) and the distal radiocarpal bone articular surface cartilage (60.60± 4.09%). The total DNA content, total glycosaminoglycan content, total chondroitin sulphate content, and total keratan sulphate for the flexor surface of the navicular bone was: 524.51± 92.89 ng, 0.1533± 0.0338 mg, 0.1018± 0.0197 mg 0.0800± 0.0176 mg, and 0.0092± 0.0037 mg per mg of dry weight cartilage, respectively. The total DNA content, total glycosaminoglycan content, total chondroitin sulphate content, and total keratan sulphate for the distal radiocarpal articular surface cartilage was: 508.80± 70.16 ng, 0.1686± 0.00838 mg, 0.0919± 0.0191, 0.0615± 0.0109 mg, and 0.0074± 0.0029 mg per mg dry weight cartilage, respectively. Not significant differences were determined between these values.
We concluded that the cartilage of the flexor surface of the navicular bone is biochemically similar to hyaline articular cartilage, but differs from previous descriptions of fibrocartilage. Further studies are needed to determine types and proportions of collagen types of the flexor surface of the normal navicular bone. These findings establish a basis of comparison to assess navicular cartilage in aging, disease, and repair.
Master of Science
Wu, Jing. "Statistical approaches to gender classification in the surface normal domain." Thesis, University of York, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.516723.
Full textWang, Yan. "Normal and enhanced raman spectroscopy of carbon electrode surfaces /." The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487687959964739.
Full textXu, Yang. "Normal impact of liquid droplets on smooth solid surfaces." Thesis, Paris Est, 2018. http://www.theses.fr/2018PESC1099/document.
Full textUnder the framework of the LabEx Multi-Scale Modelling and Experimentation of Materials for Sustainable Construction, of Université Paris-Est Marne-La-Vallée, the present PhD thesis aims at modelling and characterizing micro-material designed by impact of molten ceramic droplets. The applications of thin coating materials are surface treatments for sustainable construction such as anti-corrosion, heat barrier, glass treatment or mechanical reinforcement of specific structures.In particular, we focus on the physics behind the liquid droplets' dynamics (the contact area and the contact time between the droplet and surface) by conducting a series of small scale multiphase flow numerical simulations with home-made code Thetis. All simulations are axisymmetric. We have considered variations of initial impact conditions, and studied the influence of inertial, capillary and viscous forces on the droplets' dynamics, especially the maximum spreading diameter, spreading time and the contact time, on solid surfaces. The code is based on Volume-Of-Fluid techniques and introduces an auxiliary smooth function to estimate the local curvature and the normal to the interface. The major reference liquid adopted are the water and the molten ceramic, the water is chosen to validate our code against available experiments at the beginning. The molten ceramic is adopted as it is widely used in thermal spray to built thermal and chemical barriers (anti-oxidant layers) as well as mechanical reinforcements on specific samples. We focus on the cases in which the surfaces are hydrophobic, even if hydrophilic cases are also considered in validation configurations for the sake of generality. Meanwhile, by introducing an energy calculation part in the code, a detailed energetic analysis of the droplet after impact is performed in both the spreading and retraction stage to have a deep understanding of the dynamics inside the droplet.We find the jetting time is inversely proportional to the impact velocity, independent of the contact angle in the early spreading. A new scaling between maximum spreading and spreading time is observed, and agrees well with experimental results. Further, we introduce this scaling into the model based on energy conservation to predict the maximum spreading factor, which provides better prediction on maximum spreading factor than existing literature references. Also a scaling of contact time is proposed in terms of Ohnesorge number and Reynolds number
Junique, Stéphane. "Surface-normal multiple quantum well electroabsorption modulators based on GaAs-related materials." Licentiate thesis, KTH, Microelectronics and Information Technology, IMIT, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-292.
Full textAdams, Brandy Rogers. "Ceramic materials mimicking normal bone surface microstructure and chemistry modulate osteoblast response." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50292.
Full textAkéké, Eric Dago. "Classification des singularités minimales de surfaces normales par les discriminants génériques." Aix-Marseille 1, 2005. http://www.theses.fr/2005AIX11030.
Full textLi, Boren. "Photometric stereo for micro-scale shape reconstruction." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/75021.
Full textPh. D.
Medeiros, Débora de Oliveira [UNESP]. "Tratamento numérico da condição de tensão normal para métodos de projeção em escoamentos com superfície livre." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/150908.
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Neste trabalho é apresentado um estudo das equações de Navier Stokes incompressível com superfície livre e métodos de projeção com uma formulação recente denominada laplaciano superficial. Esta formulação tem como finalidade uma melhor descrição da força de tensão superficial e grandezas, como curvatura e vetores tangencial e normal, descritas sobre a interface. Assim, uma condição de tensão normal alternativa é definida, e esta quando discretizada implicitamente e combinada com o método de projeção, descrevem a formulação laplaciano superficial, cuja sua solução é utilizada como condições de contorno para resolver o sistema de equações que descrevem o escoamento. A nova formulação destina-se a resolver um sistema tridiagonal de equações gerado sobre a interface, e usar a solução deste sistema de equações como uma condição de contorno na superfície livre para o sistema linear da correção da pressão no interior do domínio, que é resultante da aplicação do método de projeção. A nova equação que define a condição de tensão normal conta com grandezas definidas na malha euleriana, no contexto Marker-And-Cell (MAC), que devem ser projetadas sobre a malha lagrangeana e também considera a curvatura e os vetores tangente e normal na sua descrição, sendo importante um estudo detalhado de geometria diferencial. Finalmente, variações da formulação laplaciano superficial com tensão superficial para diferenças finitas são aplicadas para resolver os testes numéricos da oscilação da gota e da gota apoiada que possuem solução de referência, além da simulação de um problema com movimento de interface (fountain flow). Nestes testes, concluímos que a variação mais precisa e estável é aquela que aplica uma discretização da equação da tensão normal utilizando médias de valores alocados na malha MAC.
This work presents a study of the Navier-Stokes equations incompressible with free surface and a projection methods with a recent formulation defined as surface laplacian. The purpose of this formulation is to improve the description of the force of stress tension and quantities, as curvature and tangent and normal vectors, present at the interface. Thus, an alternative normal stress condition is defined, and when this is discretized implicitly and combined with the employ of projection method, describe the surface laplacian formulation, whose solution is used as boundary condition to solve the system of equations describing the flow. The new formulation is intended to solve the tridiagonal system of equations generated at the interface, and to use this solution as a boundary condition at free surface for the linear system of the pressure correction inside of domain, which results of the application of the projection method. The new equation used to define the normal stress condition considers quantities defined in the Eulerian mesh, in the Marker-And-Cell context (MAC), that should be projected on the Lagrangian mesh. In addition, in the new equation, it is also considered the influence of the curvature and normal and tangential vectors in your description, so that a detailed study of differential geometry for this computation is important. Finally, variations of the surface laplacian formulation for finite differences are applied for solving numerical tests of the drop oscillation and sessile drop which have reference solutions, beyond of the simulation of a problem with free surface moving (fountain flow). In these tests, we concluded that the most accurate and stable variation is the one that applies a discretization of the normal stress equation using the mean of values in the MAC mesh.
FAPESP: 2015/01243-0
Hodiak, Justin Hannah. "Design of fiber-coupled surface-normal fabry perot electroabsorption modulators for analog applications /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1999. http://wwwlib.umi.com/cr/ucsd/fullcit?p9936831.
Full textPare, Christopher J. "Perceptual analysis of voice change associated with surface electrical stimulation in normal speakers." Tallahassee, Fla. : Florida State University, 2009. http://purl.fcla.edu/fsu/lib/digcoll/undergraduate/honors-theses/244573.
Full textAdvisor: Dr. Richard J. Morris, Florida State University, College of Arts and Sciences, Dept. of Biology. Includes bibliographical references.
Öhrn, Kristina. "Different Mapping Techniques for Realistic Surfaces." Thesis, University of Gävle, Department of Mathematics, Natural and Computer Sciences, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-612.
Full textThe different mapping techniques that are used increases the details on surfaces without increasing the number of polygons. Image Based Sculpting tools in the program Modo and Z-Brush is used to create folds and wrinkles from photographs of actual fabrics instead of trying to create these shapes by modeling them. This method makes it easier to achieve photorealistic renderings and produce as realistic fabric dynamics as possible when they are applied on objects.
Ding, Yi. "Obtaining 3D malgnant melanoma indicators through the analysis of surface normals from photometric stereo." Thesis, University of the West of England, Bristol, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490447.
Full textLin, Yiqiang Farouk Bakhtier. "Acoustic wave induced convection and transport in gases under normal and micro-gravity conditions /." Philadelphia, Pa. : Drexel University, 2007. http://hdl.handle.net/1860/1795.
Full textMassart, Daniel. "Normes stables des surfaces." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 1996. http://tel.archives-ouvertes.fr/tel-00589624.
Full textMagnusson, Martin. "The three-dimensional normal-distributions transform : an efficient representation for registration, surface analysis, and loop detection." Doctoral thesis, Örebro universitet, Akademin för naturvetenskap och teknik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-8458.
Full textHastie, C. L. "Differential protein expression on the cell surface of normal epithelial and prostate cancer cells." Thesis, University College London (University of London), 2007. http://discovery.ucl.ac.uk/1445546/.
Full textSiu, Hiu-fai, and 蕭曉暉. "Quantitative lumbar surface EMG topographic analysis: comparison between normal and low back pain patients." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B4327870X.
Full textSeck, Alassane. "3D surface texture analysis of high resolution normal fields for facial skin condition assessment." Thesis, Aberystwyth University, 2016. http://hdl.handle.net/2160/d3544edf-bcd2-4af1-85af-f125cba675f7.
Full textSiu, Hiu-fai. "Quantitative lumbar surface EMG topographic analysis comparison between normal and low back pain patients /." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B4327870X.
Full textRissmann, Clinton Francis. "Using Surface Methods to Understand the Ohaaki Hydrothermal Field, New Zealand." Thesis, University of Canterbury. Geological Sciences, 2010. http://hdl.handle.net/10092/5027.
Full textTombari, Francesca. "Deformation of surfaces in 2D persistent homology." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15809/.
Full textDurgun, Ahmet Cemal. "Computation Of Radar Cross Sections Of Complex Targets By Physical Optics With Modified Surface Normals." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609810/index.pdf.
Full textto compute the Radar Cross Section (RCS) of arbitrary shaped complex targets by using Physical Optics (PO) and Modified PO. To increase the computational efficiency of the code, a novel fast integration procedure for oscillatory integrals, called Levin&rsquo
s integration, is applied to PO integrals. In order to improve the performance of PO near grazing angles and to model diffraction effects, a method called PO with Modified Surface Normal Vectors is implemented. In this method, new surface normals are defined to model the diffraction mechanism. Secondary scattering mechanisms like multiple scattering and shadowing algorithms are also included into the code to obtain a complete RCS prediction tool. For this purpose, an iterative version of PO is used to account for multiple scattering effects. Indeed, accounting for multiple scattering effects automatically solves the shadowing problem with a minor modification. Therefore, a special code for shadowing problem is not developed. In addition to frequency domain solutions of scattering problems, a waveform analysis of scattered fields in time domain is also comprised into this thesis. Instead of direct time domain methods like Time Domain Physical Optics, a Fourier domain approach is preferred to obtain the time domain expressions of the scattered fields. Frequency and time domain solutions are obtained for some simple shapes and for a complex tank model for differently polarized incident fields. Furthermore, a statistical analysis for the scattered field from the tank model is conducted.
Yadav, Sunil Kumar [Verfasser]. "Surface Denoising based on The Variation of Normals and Retinal Shape Analysis / Sunil Kumar Yadav." Berlin : Freie Universität Berlin, 2018. http://d-nb.info/1171431228/34.
Full textUjir, Hamimah. "3D facial expression classification using a statistical model of surface normals and a modular approach." Thesis, University of Birmingham, 2013. http://etheses.bham.ac.uk//id/eprint/4371/.
Full textUgolini, Matteo. "K3 surfaces." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18774/.
Full textNorman, Jessica K. "Perceptual analysis of voice change associated with surface electrical stimulation in normal speakers sentence data /." Tallahassee, Fla. : Florida State University, 2010. http://purl.fcla.edu/fsu/lib/digcoll/undergraduate/honors-theses/2181937.
Full textAdvisor: Dr. Richard J. Morris, Florida State University, College of Arts and Sciences, Dept. of Communication Science and Disorders.
Hedley, Susan Jennifer. "Investigation of pigmentation and immune-related cell surface molecules in cultured normal and vitiligo melanocytes." Thesis, University of Sheffield, 1999. http://etheses.whiterose.ac.uk/3483/.
Full textNaik, Raj. "Investigations of cell surface oligosaccharides in normal vulval epithelium and in preinvasive/invasive vulval lesions." Thesis, University of Newcastle Upon Tyne, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360742.
Full text