Дисертації з теми "Planar models"
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Venkateswaran, Ajay. "Analysis of planar EBG structures using transmission line models." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40812.
Повний текст джерелаLes solutions analytiques basées sur des lignes de transmission ont simplifié l'ingénierie de circuits micro-ondes complexes, tel que les EBG. La présente thèse étudie les structures coplanaires EBG à partir d'éléments discrets et de modèles de lignes de transmission, auxquels sont ensuite appliquées des formules analytiques. Grâce à cette approche, un logiciel a été développé permettant de prédire les caractéristiques de dispersion de ces structures périodiques en quelques secondes seulement. Les structures coplanaires EBG contenant des sections courbes sont étudiées et un modèle de circuit équivalent à la portion courbe est proposé. L'analyse des structures EBG commence par une simple géométrie 1D, puis est étendue à des géométries 2D plus complexes. Le résultat des simulations analytiques est évalué par rapport au résultat des simulations analogues. Lorsque les sections courbes sont incluses, le début de la bande interdite est porté en deçà de 1GHz, rendant la structure plus intéressante pour le filtrage basse fréquence omni- directionnel.
Dods, Steven R. A. "A spectral theory for planar dielectric waveguides." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30690.
Повний текст джерелаApplied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate
Lazaryan, Shushan, Nika LAzaryan, and Nika Lazaryan. "Discrete Nonlinear Planar Systems and Applications to Biological Population Models." VCU Scholars Compass, 2015. http://scholarscompass.vcu.edu/etd/4025.
Повний текст джерелаCollet, Gwendal. "Enumeration and analysis of models of planar maps via the bijective method." Palaiseau, Ecole polytechnique, 2014. https://tel.archives-ouvertes.fr/tel-01084964/document.
Повний текст джерелаBijective combinatorics is a field which consists in studying the enumerative properties of some families of mathematical objects, by exhibiting bijections (ideally explicit) which preserve these properties between such families and already known objects. One can then apply any tool of analytic combinatorics to these new objets, in order to get explicit enumeration, asymptotics properties, or to perform random sampling. In this thesis, we will be interested in planar maps – graphs drawn on the plane with no crossing edges. First, we will recover a simple formula –obtained by Eynard – for the generating series of bipartite maps and quasi-bipartite maps with boundaries of prescribed lengths, and we will give anatural generalization to p-constellations and quasi-p-constellations. In the second part of this thesis, we will present an original bijection for outertriangular simple maps – with no loops nor multiple edges – and eulerian triangulations. We then use this bijection to design random samplers for rooted simple maps according to the number of vertices and edges. We will also study the metric properties of simple maps by proving the convergence of the rescaled distance-profile towards an explicit random measure related to the Brownian snake
Sola, Alan. "Conformal Maps, Bergman Spaces, and Random Growth Models." Doctoral thesis, KTH, Matematik (Avd.), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12364.
Повний текст джерелаQC 20100414
Al-Awfi, Saud A. Gh. "Spontaneous emission and atom dynamics in planar and cylindrical structures." Thesis, University of Essex, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298835.
Повний текст джерелаYatsunyk, Liliya. "Synthesis, structure, and magnetic spectroscopies of non-planar hemes as models of the cytochrome B heme centers." Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/280394.
Повний текст джерелаEspinosa, Diego Alejandro. "Moment-dependent pseudo-rigid-body models for beam deflection and stiffness kinematics and elasticity." [Tampa, Fla] : University of South Florida, 2009. http://purl.fcla.edu/usf/dc/et/SFE0002943.
Повний текст джерелаAlbert, Jacques. "Characterizations and design of planar optical waveguides and directional couplers by two-step K+ -Na+ ion-exchange in glass." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75759.
Повний текст джерелаExperimental characterizations of planar waveguide with respect to a wide range of fabrication conditions have been carried out, including detailed measurements of the refractive index anisotropy resulting from the large induced surface stresses.
Parallel to this, the non-linear diffusion process of ion-exchange was simulated numerically to provide, along with the results of the characterizations, a complete description of the refractive index profile from any set of fabrication conditions.
The magnitude of the maximum surface index change observed was shown theoretically to be almost entirely due to the induced stress at the surface of the substrate, arising from the presence of the larger potassium ions.
Finally, a novel class of single-mode channel waveguides, made by a "two-step" ion-exchange was analyzed. A simple model for these waveguides was developed and used in the design of two directional coupler structures which were fabricated and measured.
The two-step process was conceived because it relaxes waveguides' dimensional control, yielding single-mode guides of larger size, better suited for low-loss connections to optical fibers. It also provides an additional degree of freedom to adjust device properties.
Besri, Abdelhadi. "Modélisation analytique et outils pour l'optimisation des transformateurs de puissance haute fréquence planars." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00612344.
Повний текст джерелаCâmara, Eder Francisco. "Estudo aerodinâmico do escoamento sobre o modelo de um ônibus." Instituto Tecnológico de Aeronáutica, 1993. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=1766.
Повний текст джерелаJan, Naeem A. "Anomalous Nature Of Metamaterial Inclusion and Compact Metamaterial-Inspired Antennas Model For Wireless Communication Systems. A Study of Anomalous Comportment of Small Metamaterial Inclusions and their Effects when Placed in the Vicinity of Antennas, and Investigation of Different Aspects of Metamaterial-Inspired Small Antenna Models." Thesis, University of Bradford, 2017. http://hdl.handle.net/10454/16003.
Повний текст джерелаRatsakou, Almpion. "Multi-physical modeling of thermographic inspection methods and fast imaging Fast models dedicated to simulation of eddy current thermography Fast simulation approach dedicated to infrared thermographic inspection of delaminated planar pieces Model based characterisation of delamination by means of thermographic inspection." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASS002.
Повний текст джерелаThermographic inspection is a popular nondestructive testing (NdT) technique that provides images of temperature distribution over large areas at surfaces of tested workpieces. Detecting delaminations between metallic layers is the matter here. Simulation of these inspections indeed helps to complement experimental studies, evaluate performance in terms of detection and support model-based algorithms. A semi-analytical model based on a truncated region eigenfunction expansion for simulation of thermographic inspection is focused onto. The problem is solved in the Laplace domain w.r.t time, and the temperature distribution approximated by expanding it on a tensor product basis. Considered sources are lamps providing thermal excitation but may also be eddy current sources (leading to a coupled electromagnetic and heat problem). The description of the delaminations as thin air gaps between the workpiece layers proves to be equivalent with introduction of a surface resistance to the heat flow, enabling treatment via the applied modal approach without additional discretisation. Complementary computations by industry (Finite Element Method) and in-house (Finite Integration Technique) codes confirm the accuracy of the developments. Then, much attention is put on imaging and detection. A two-step procedure is devised, first denoising of raw signals and detection of any possible defect using a thermographic signal reconstruction leading to high spatial and temporal resolution in the transverse plane, completed by proper edge detection, second an iterative optimization being employed, with results of the first step used for regularization of a least-square scheme to characterize thicknesses and depths. All the above is illustrated by comprehensive numerical simulations in conditions close to practice
Knoesen, André. "Guided modes in anisotropic dielectric planar waveguides." Diss., Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/14898.
Повний текст джерелаLeung, Yin-Ling. "Surface studies of planar model HDN catalysts." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ34576.pdf.
Повний текст джерелаBaumgart, Tobias. "Herstellung und physikochemische Charakterisierung von planaren gestützten Lipid-Modellmembran-Systemen Preparation and physicochemical characterisation of planar supported lipid model membrane systems /." [S.l.] : [s.n.], 2001. http://ArchiMeD.uni-mainz.de/pub/2001/0123/diss.pdf.
Повний текст джерелаSantos, João Cavalcanti. "Análise numérica e experimental da influência da redundância cinemática em um manipulador paralelo planar." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/18/18149/tde-10112017-094950/.
Повний текст джерелаAs a consequence of their reduced inertia, parallel manipulators present superior energetic efficiency and they are able to reach high accelerations. Nevertheless, their workspace has a poorly uniform performance. Indeed, the presence of parallel singularities is a strong limitant for this kind of robots. On the one hand, actuation redundancy is well-known as a good choice in an effort to solve this issue. On the other hand, kinematic redundancy still have unclear consequences on this matter. A kinematically redundant manipulator presents an end-effector with fewer degrees of freedom than the mechanism as a whole. Considering this gap, the objective of this research is to analyze the influence of kinematic redundancy on the performance of parallel manipulators through simulations and experimental tests. This issue turns out to be complex, once traveling actuators sum additional inertia to the system. Metrics are defined in order to evaluate how favourable is a given position, and redundancy resolution strategies are analyzed using them. The main proposed strategy is composed of two steps. In the first one, a movement is defined so that the position for each instant is optimum for a given multiobjective performance metric. This procedure delivers a refererence movement which generally presents high accelerations. On the second step, a global optimization is applied, seeking for a trade-off between the proximity to the reference and the acceleration levels. In addition, several local methods (which resolve the inverse kinematics for each instant independently) and one truncated global strategy were addressed. These configurations were compared numerically and experimentally, delivering a objective analysis of the influence of kinematic redundancy on the performance of the parallel manipulator. The experimental campaign was executed with a physical prototype built at the São Carlos School of Engineering. This is a planar manipulator with 6 degrees of freedom, consequently presenting up to 3 degrees of redundancy. The mechanism is actuated by 6 rotating motors, of which 3 are coupled to leadscrews, resulting in linear actuators. These leadscrews can be locked, defining different degrees of redundancy and granting the versatility of the prototype.
Hall, Ian Melvyn. "Quasi-modes and the evolution of coherent planar vortices." Thesis, University of Exeter, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269719.
Повний текст джерелаZhu, Ning. "Planar metallization failure modes in integrated power electtonics modules." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/27530.
Повний текст джерелаPh. D.
Araújo, Manoel Silvino Batalha de. "Extensão de GENSMAC para escoamentos de fluidos governados pelos modelos integrais Maxwell e K-BKZ." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-08022007-151417/.
Повний текст джерелаThe aim of this work is to develop a numerical technique for simulating incompressible, isothermal, free surface (also con¯ned) viscoelastic flows of fuids governed by the integral models of Maxwell and K-BKZ (Kaye-Bernstein, Kearsley and Zapas). The numerical technique described herein is an extension of the GENSMAC method (Tome and McKee, J. Comput. Phys., 110, pp. 171-186, 1994) to the solution of the momentuum and mass conservation equations together with the integral constitutive Maxwell and K-BKZ equations. The governing equations are solved by the finite difference method on a staggered grid using a Marker-and-Cell approach. The fluid is represented by marker particles on the fluid surface only. This provides the visualization and location of the fluid free surface so that the free surface stress conditions can be applied. The Finger tensor Bt0(t) is computed using the ideias of the deformation fields method (Peters et al. J. Non-Newtonian Fluid Mech., 89, pp. 209-228, 2001) so that it is not necessary to track a fluid particle in order to calculate its deformation history. However, in this work modifcations to the deformation fields method are introduced: the past time is discretized using a different formula, the Finger tensor Bt0(x; t) is obtained by a second order method and the stress tensor ? (x; t) is computed by a second order quadrature formula. The numerical method presented in this work is validated by simulating the flow of a Maxwell fluid in a two-dimensional channel and the numerical solutions of the velocity and the stress components are compared with the respective analytic solutions providing a good agreement. Further, the flow through a 4:1 planar contraction of a specific fuid studied experimentally by Quinzani et al. (J. Non-Newtonian Fluid Mech., 52, pp. 1-36, 1994) was simulated and the numerical results were compared qualitatively and quantitatively with the experimental results and very good agreement was obtained. The Maxwell and the K-BKZ models were applied to simulate the 4:1 planar contraction problem using various Weissenberg numbers and the numerical results were in agreement with those published in the literature. Finally, numerical results of free surface flows using the Maxwell and K-BKZ integral constitutive equations are presented. In particular, the numerical simulation of jet buckling using several Weissenberg numbers and various Reynolds numbers are presented
Ball, Eddie H. "Virtual Planar Motion Mechanism Testing of 8:1 Spheroids." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/53515.
Повний текст джерелаMaster of Science
MOREIRA, Roemir Pereira Machado. "Aspectos de teorias planares com violação da simetria de Lorentz." Universidade Federal do Maranhão, 2011. http://tedebc.ufma.br:8080/jspui/handle/tede/1859.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
The gauge sector of the Standard Model Extended (MPE) has been investigated in many respects in recent years, discussing the effects of Lorentz symmetry violation in physical systems and the limitations on the magnitude of the parameters of violation. This work revisited some planar theories derived from the dimensional reduction of the gauge sector of the MPE, and perform an original contribution: the dimensional reduction of the CPT-even and nonbirefringent gauge sector of the MPE, composed of nine components. The resulting planar theory includes a gauge sector and scalar sector (which has an nonsual kinetic term), coupled together by a 3-vector Cα Lorentz violation. Both sectors, gauge and scale, are affected by the six components of a symmetric tensor violates Lorentz, kµρ. The energy-momentum tensor is explicitly calculated, revealing that the energy of the gauge and scalar sectors is stable for small values of the parameters of violation. The equations of motion for the electric and magnetic elds, as well as the potentials, are written and analyzed in the steady state. Then employ the method of Green to get the stationary solutions of classical electrodynamics to rst order in the parameters of violation. It is observed that the coe cients of Lorentz violation does not alter the asymptotic behavior of the elds, but does not induce an angular dependence observed in the planar theory of Maxwell. The dispersion relation is exactly computed and is compatible with a theory does not birefringent, and demonstrating that the theory is stable, but in general, not causal. Finally, we calculate the Feynman propagator for the gauge elds and scalar theory of planar, accurately, using a set of 11 projectors that form a closed algebra. We use the expression of the Feynman propagator to analyze the consistency of the theory regarding its stability, causality and unitarity.
O setor de gauge do Modelo Padrão Estendido (MPE) tem sido investigado em muitos aspectos nos últimos anos, discutindo os efeitos da violação da simetria de Lorentz em sistemas físicos e as limitações da magnitude dos parâmetros de violação. Neste trabalho, rediscutimos algumas teorias planares obtidas a partir da redução dimensional do setor de gauge do MPE, e realizamos uma contribuição original: a redução dimensional do setor de gauge CPT-par e não-birrefringente do MPE, composto por nove componentes. A resultante teoria planar abarca um setor de gauge e um setor escalar (dotado de um termo cinético não usual), acoplados entre si por um 3-vetor Cα de violação de Lorentz (LV). Ambos os setores, de gauge e escalar, são afetados pelas seis componentes de um tensor simétrico violador de Lorentz, kµρ. O tensor de energia-momento É explicitamente calculado, revelando que a energia dos setores de gauge e escalar são estáveis para pequenos valores dos parâmetros de violação. As equações de movimento para os campos elétrico e magnético, assim como para os potenciais, são escritas e analisadas no regime estacionário. Empregamos então o método de Green para obter as soluções clássicas estacionárias desta eletrodinâmica em primeira ordem nos parâmetros de violação. É observado que os coefi cientes de violação de Lorentz não alteram o comportamento assintótico dos campos, mas induzem uma dependência angular não observada na teoria planar de Maxwell. A relação de dispersão é exatamente computada, sendo compatível com uma teoria não birrefringente, e demonstrando que a teoria é estável, mas, em geral, não causal. Por fim, calculamos o propagador de Feynman para os campos de gauge e escalar desta teoria planar, de forma exata, usando um conjunto de 11 projetores que formam uma álgebra fechada. Usamos a expressão do propagador de Feynman para analisar a consistência da teoria no que concerne a sua estabilidade, causalidade e unitariedade.
Grande, Helder Luciani Casa. "Modelos de dímeros em redes planas. Matriz de transferência e soluções por meio da representação de férmions." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-12052009-100334/.
Повний текст джерелаWe solve the dimer model on two different planar lattices, the 4-8 lattice and the honeycomb lattice. In the dimer model on the 4-8 lattice there is a phase transition of the (two-dimensional) Ising type; on the honeycomb lattice there is a phase transition known as 3/2. After defining the model we show that the calculation of the partition function can be formulated as the trace of a transfer matrix that is written in terms of Pauli matrices. Using the Jordan-Wigner transformation, the Pauli matrices give rise to fermion creation and annihilation operators, and the problem is reduced to the diagonalization of a system of free fermions. We compare the solutions of the dimer model on the 4-8 lattice and of the two-dimensional Ising model; in particular, we compare the behavior of the specific heat and we analyze the spectrum of the transfer matrix. These solutions agree with well-known results from combinatorial techniques. We then use the transfer matrix approach to obtain a continuum time formulation for the dimer models on the square, 4-8 an d honeycomb lattices. In contrast to the Ising case, for the dimer models this approximation changes the nature of critical behavior.
Emir-Farinas, Hulya. "Aggregation of demand points for the planar covering location model." [Gainesville, Fla.]: University of Florida, 2002. http://purl.fcla.edu/fcla/etd/UFE0000530.
Повний текст джерелаDumbuya, Karifala. "Synthesis and characterisation of planar model catalysts for Olefin metathesis." [S.l.] : [s.n.], 2005. http://www.diss.fu-berlin.de/2005/324/index.html.
Повний текст джерелаBowen, Adam Mark Alexander. "Video Based Rendering and Coding using a Planar Patch Model." Thesis, University of Warwick, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.504799.
Повний текст джерелаJoshi, Atul Ravindra. "Design and control of a three degree-of-freedom planar parallel robot." Ohio : Ohio University, 2003. http://www.ohiolink.edu/etd/view.cgi?ohiou1175180058.
Повний текст джерелаJakel, Roland. "Analysis of Hyperelastic Materials with Mechanica - Theory and Application Examples." Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-201000705.
Повний текст джерелаTeil 1: Theoretische Hintergrundinformation - Das Hookesche Gesetz für linear-elastische Werkstoffe - Die Dehnungsenergiedichte für linear-elastische Materialien - Hyperelastisches Material - Materialgesetze für Hyperelastizität - Auswählen des Materialgesetzes und Testdurchführung - Implementierung der hyperelastischen Materialgesetze in Mechanica - Definieren der hyperelastischen Materialparameter in Mechanica - Testaufbauten und Prüfkörper der unterstützten Materialtests - Der einachsige Druckversuch - Spannungs- und Dehnungsdefinition in der Mechanica-Analyse mit großen Verformungen Teil 2: Anwendungsbeispiele - Ein einachsig beanspruchter Prüfkörper - Ein volumetrischer Drucktest - Ein planarer Test - Einfluss des Materialgesetzes Anhang: - Kurzvorstellung der PTC Simulationsdienstleistungen - Wörterbuch technisches Englisch-Deutsch
Peterson, Keith A. "An experimental approach for studying creep behavior of model planar interfaces." Thesis, Monterey, California. Naval Postgraduate School, 2000. http://hdl.handle.net/10945/7693.
Повний текст джерелаAn apparatus for measuring the steady state creep behavior of interfaces in aluminum-silicon-aluminum multilayered specimens has been assembled. In the experiment scheme, a double-shear specimen geometry was used to load the interfaces in a state of nominally constant shear. The deformation kinetics for interfacial sliding during constant shear stress creep experiments were measured for various applied interfacial shear Stress levels and temperatures. Interfacial shear strain rates were measured using displacement and capacitance gauges. The planar interfaces between the aluminum and silicon layers were prepared by diffusion bonding. Preliminary results indicate that that interfacial sliding occurs via time-dependent relaxation mechanisms and that there is a threshold stress for interfacial sliding, in agreement with previous work on lead-Quartz and lead- nickel interfaces
Lemme, Brian D. "Non-planar silicon oxidation : an extension of the Deal-Grove model." Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/1394.
Повний текст джерелаBrown, Matthew Lee. "Dynamics of Rigid Fibers in a Planar Converging Channel." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6894.
Повний текст джерелаSousa, Welington Fernandes de. "A geometria analítica como um modelo para a geometria euclidiana." reponame:Repositório Institucional da UnB, 2017. http://repositorio.unb.br/handle/10482/31974.
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Este trabalho mostra, com ênfase na geometria plana, o modelo dedutivo formulado por Euclides de Alexandria pelo qual ele constrói e organiza todo o conhecimento geométrico conhecido até então. Este modelo euclidiano, chamado axiomático, com o passar dos anos revelou falhas em demonstrações de algumas proposições que são citadas e comentadas neste trabalho. As tentativas para corrigir as falhas e formalizar o modelo axiomático de Euclides, levou a um novo modelo axiomático mais formal, que corrige as falhas cometidas por Euclides e traz uma linguagem mais coerente com a proposta da matemática moderna. Tal modelo foi publicado por David Hilbert em seu trabalho Grundlagen der Geometrie, e também está presente neste trabalho. Após mostrar como a geometria euclidiana plana foi formulada em função de seus axiomas, o trabalho chega ao seu ponto principal: mostrar que a geometria euclidiana plana pode ser demonstrada na geometria sobre corpos (geometria analítica). E para isso, este trabalho disponibiliza a demonstração de todos os axiomas de Hilbert, para a geometria euclidiana plana, em um plano cartesiano sobre um corpo. Veremos que não haverá necessidade de trabalharmos sobre o corpo dos números reais para que esta geometria euclidiana plana seja demonstrada pela geometria analítica. Além disso o trabalho traz um pouco das características e propriedades de corpos e suas extensões à medida que as demonstrações se aprofundam. Chegaremos à conclusão de que todos os axiomas da geometria euclidiana plana podem ser demonstrados na geometria analítica, sobre um corpo ordenado com extensão às raízes quadradas de elementos positivos.
This work shows, with emphasis on plane geometry, the deductive model formulated by Euclid of Alexandria by which he constructed and organized all known geometric knowledge until then. This Euclidean model, called axiomatic, over the years revealed aws in demonstrations of some propositions that are cited and commented on in this work. The attempts to correct the failures and formalizing the axiomatic model of Euclid led to a new more formal axiomatic model that corrects Euclid's failures which is more and uses a language more consistent to proposal of modern mathematics. Such a model was published by David Hilbert in his work Grundlagen der Geometrie, and is also present in this work. After showing how Euclidean geometry is formulated in terms of its axioms, the work reaches its main point: to show that Euclidean plane geometry can be demonstrated in geometry over elds (analytic geometry). And for this, we provide the demonstration of all axioms of Hilbert, for Euclidean plane geometry, in a Cartesian plane over a eld. We will see that there will be no need to work on the eld of real numbers for this Euclidean plane geometry to be demonstrated by analytic geometry. In addition the work brings some of the characteristics and properties of elds and their extensions as the demonstrations deepen. We will arrive at the conclusion that all the axioms of Euclidean plane geometry can be demonstrated in analytical geometry, on an ordered eld with extension to the square roots of positive elements.
關福延 and Folk-year Kwan. "An intelligent approach to automatic medical model reconstruction fromserial planar CT images." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B31243216.
Повний текст джерелаLuttrell, Timothy. "Photocatalysis and Grazing-Ion Beam Surface Modifications of Planar TiO2 Model Systems." Scholar Commons, 2014. https://scholarcommons.usf.edu/etd/5064.
Повний текст джерелаIqbal, Kamran. "Stability and control in a planar neuro-musculo-skeletal model with latencies /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487780393265452.
Повний текст джерелаLang, Cheng-Lien. "Existence and stability of a planar wave solution to a combustion model /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487780393266681.
Повний текст джерелаElmegri, Fauzi O. M. "Model and design of small compact dielectric resonator and printed antennas for wireless communications applications : model and simulation of dialectric resonator (DR) and printed antennas for wireless applications : investigations of dual band and wideband responses including antenna radiation performance and antenna design optimization using parametric studies." Thesis, University of Bradford, 2015. http://hdl.handle.net/10454/14742.
Повний текст джерелаElmegri, Fauzi. "Model and design of small compact dielectric resonator and printed antennas for wireless communications applications. Model and simulation of dialectric resonator (DR) and printed antennas for wireless applications; investigations of dual band and wideband responses including antenna radiation performance and antenna design optimization using parametric studies." Thesis, University of Bradford, 2015. http://hdl.handle.net/10454/14742.
Повний текст джерелаGeneral Secretariat of Education and Scientific Research Libya
Rabelo, Nilson Rafael. "Spectral fields in planar multilayered structures excited by embedded sources." Instituto Tecnológico de Aeronáutica, 2015. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=3391.
Повний текст джерелаCastro, Davi Rogério da Silva. "Optimization models for allocation of air strike assets with persistence /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Dec%5FCastro.pdf.
Повний текст джерелаThesis advisor(s): Richard E. Rosenthal, R. Kevin Wood. Includes bibliographical references (p. 53-56). Also available online.
Cadorin, Jair Libero. "Estudo de diagramas de fases de alguns variantes do modelo ANNNI e de um modelo planar clássico helicoidal." Universidade de São Paulo, 1993. http://www.teses.usp.br/teses/disponiveis/43/43133/tde-26022014-145535/.
Повний текст джерелаIn this work we have studied two types of models for the description of modulated magnetic systems. The first is the ANNNI (Axial NextNearest-Neighbor Ising) model. Within the mean-field approximation we have studied various effects which comes about when the intralayer interactions are weaker than the interlayer interactions. We have investigated in particular the possibility of partially disordered phases, characterized by the presence of layers with zero magnetization. We also have studied the behavior of the accumulation points of the branching points, which separates the commensurate-commensurate transitions from the commensurate-incommensurate transitions. We have also investigated two variants of the ANNNI model, one with an arbitrary spin and the other with spin 1 and a term of crystal-field anisotropy. The second type of the model we have studied, appropriate for systems presenting helicoidal modulation of the magnetization, is a classical planar model with nearest and next-nearest interactions along an axial direction. \\\'Ve have restricted our study to the absolute zero of the temperature. The magnetization is expanded in Fourier series for high and low fields. We also analyse the stability of the commensurate phases, within a continuum approximation, using the soliton theory. Finally, we construct numerically the phase diagram of the model using the method of effective potentials.
Treviso, Felipe. "Estudo de um atuador planar de indução para a inspeção de superfícies metálicas." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/141822.
Повний текст джерелаAn induction planar actuator is a device that, based on the operating principle of a linear induction motor, in which the interaction between a travelling magnetic field produced by the primary of the device and a conducting surface generates eddy currents in the surface and leads to the generation of a thrust force. The device produces planar motion over this surface through movement on two orthogonal axis. An application of this movement is in a platform for the inspection of metallic surfaces, which is driven by the planar induction motor and equipped with cameras and sensors to inspect the surface. This application benefits from the normal force produced by the induction planar actuator operating over a ferromagnetic surface to attach the driving platform to it. An analytical model with equations for the electric and magnetic fields is presented, and numerical simulations based on the finite element method are carried out to assess the behaviour of the device using three different surfaces as secondary: a double-layered secondary formed by an aluminum plate over a steel plate; a aluminum only plate; and a single steel plate. The distributions for the magnetic field computed through these theoretical models show good agreement, and are employed to evaluate the thrust and normal forces produced by the planar induction actuator. Experimental measurements are made on a prototype of the device, and the results are compared to the results of the theoretical models, showing good agreement and potential in the application of the induction planar motor for the inspection of horizontal metallic surfaces.
Khajehnasiri, Amirreza. "A Generalized 2-D Multiport Model for Planar Circuits with Slots in Ground Plane." Thesis, University of Waterloo, 2005. http://hdl.handle.net/10012/777.
Повний текст джерелаThis thesis is about developing a new approximate multiport network model for fast analysis of multi-layered planar structures with ground plane slots. To extend applicability of multiport network model (MNM) to the class of planar structures containing ground plane slots, a generalized network formulation for aperture problems is combined with traditional MNM to account for the presence of the slot. To this end, the slot is replaced by an unknown equivalent surface magnetic current. Slot ports are defined in terms of electric and magnetic fields over the slot in accordance with the generalized network formulation for aperture problems. While traditional MNM for planar circuits is based on generalized impedance matrices, we adopt a hybrid matrix approach for multi-layer structures. The hybrid matrix consists of four sub-matrices that relate terminal voltages and currents of edge and slot ports. The same generalized impedance matrix in the absence of the slot can be used to relate terminal voltages and currents of edge ports when the slot ports are short-circuited. Open circuit voltage at edge ports due to terminal voltages at slot ports and terminal currents at slot ports due to input currents at edge ports are represented by two transfer matrices. Both these transfer matrices can be calculated from 2D analysis which only considers TMz modes.
Interaction among slot ports, represented by a generalized admittance matrix, however, requires considering both TMz and TEz modes. This generalized admittance matrix is obtained from tangential component of the magnetic field over the slot due to the equivalent surface magnetic current and relates terminal voltages and currents of slot ports. Full modal expansion consisting of both TMz and TEz modes is used to compute the generalized admittance matrix of a slot in a regularly shaped planar cavity. For irregularly shaped patches, modal expansion is not available. Instead, a new contour integral equation for magnetic field, derived for the first time in this thesis, is combined with complex images method for calculation of generalized admittance matrix of a slot radiating in a planar cavity of arbitrary shape.
Once the hybrid matrix representation of a planar circuit on a ground plane containing a slot is derived, it can be connected to the hybrid matrix of any other planar circuit on the other side of the ground plane. This can be done by enforcing network equivalent of continuity of tangential fields across the slot. This leads to a generalized impedance matrix for the multi-layer structure relating terminal voltages and currents of edge ports of both planar circuits.
To show the accuracy of the proposed method of analysis, several proof-of-concept structures have been analyzed by both this method and ANSOFT HFSS full-wave simulator as a reference. In most cases excellent agreement is achieved in predicting the return loss and radiation patterns of these multi-layer structures which proves the validity of the proposed approach for fast analysis and design of multi-layer planar structures.
Johnson, David Craig. "A coning motion apparatus for hydrodynamic model testing in a non-planar cross-flow." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/10945/25780.
Повний текст джерелаBonifácio, Paulo Roberto de Oliveira. "Vibração aleatória de placas, vigas e estruturas acopladas." Florianópolis, SC, 2003. http://repositorio.ufsc.br/xmlui/handle/123456789/85401.
Повний текст джерелаMade available in DSpace on 2012-10-20T18:19:43Z (GMT). No. of bitstreams: 0
Sistemas mecânicos, tais como estruturas aeroespaciais, navais, automobilísticas e plataformas de prospecção e produção de petróleo, estão sujeitos a carregamentos dinâmicos aleatórios, os quais transferem vibrações através de seus acoplamentos. Estes sistemas são normalmente formados por estruturas periódicas, compostas de placas e vigas metálicas, e possuem boa eficiência de irradiação sonora. Tendo em vista a complexidade e as grandes dimensões destes sistemas, as análises numéricas através de métodos determinísticos são possíveis somente na faixa de freqüência restrita aos primeiros modos globais de vibração, o que
Koell, Perrine. "Développement d'un modèle biomécanique du rachis basé sur les relations 3D internes - externes : radiographie bi-planaire et franges de Moiré." Phd thesis, Université Claude Bernard - Lyon I, 2010. http://tel.archives-ouvertes.fr/tel-00577629.
Повний текст джерелаAyliffe, Benjamin A. "Giant planet formation and migration." Thesis, University of Exeter, 2009. http://hdl.handle.net/10036/85873.
Повний текст джерелаPoncelet, Olivier. "Ondes planes hétérogènes à fréquence complexe : modes propres de plaques immergées." Bordeaux 1, 1996. http://www.theses.fr/1996BOR10707.
Повний текст джерелаPARLETTE, EDWARD BRUCE. "GENERALIZED FUNCTION SOLUTIONS TO THE FOKKER-PLANCK EQUATION." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/187933.
Повний текст джерелаLacorte, Caniato Serrano Ariana Maria da Conceição. "Synthesis and design of tunable microwave bandpass filters using planar patch resonators." Thesis, Grenoble, 2011. http://www.theses.fr/2011GRENT029/document.
Повний текст джерелаThe objective of this thesis is the design and synthesis of tunable bandpass filters at microwave frequencies using planar patch resonators. A methodology for the design and synthesis of tunable patch filters is developed and applied to two filters with triangular and circular topologies. The methodology provides techniques to extract the coupling scheme that models the filter behavior and the necessary equations for calculating the corresponding coupling matrix. Then, the theoretical filter response resulting from the analysis of the coupling matrix coefficients is compared to the results of complete simulations. The complete simulations combine the results of the 3D electromagnetic (EM) simulation of the filter layout with the results of the electrical simulation of the tuning devices, represented by their lumped elements equivalent model. This allows the correct model of the tuning effect and the definition of the tuning possibilities and limits. In order to validate the methodology, the tunable patch filters are fabricated using Microwave Integrated Circuit (MIC) technology on flexible substrates. The minimum dimensions are greater than 0.5 mm, ensuring a low cost fabrication process