Дисертації з теми "Invariant cone"
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Bakit, Hany Albadrey Hosham [Verfasser], Tassilo [Akademischer Betreuer] Küpper, and Rüdiger [Akademischer Betreuer] Seydel. "Cone-like Invariant Manifolds for Nonsmooth Systems / Hany Albadrey Hosham Bakit. Gutachter: Tassilo Küpper ; Rüdiger Seydel." Köln : Universitäts- und Stadtbibliothek Köln, 2011. http://d-nb.info/1038065402/34.
Повний текст джерелаFornasin, Nelvis [Verfasser], Sebastian [Akademischer Betreuer] Goette та Katrin [Akademischer Betreuer] Wendland. "[eta] invariants under degeneration to cone-edge singularities = η invariants under degeneration to cone-edge singularities". Freiburg : Universität, 2019. http://d-nb.info/1203804326/34.
Повний текст джерелаAbdalla, Leonardo Batoni. "Propriedades eletrônicas dos isolantes topológicos." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-17072015-140214/.
Повний текст джерелаIn the search of a better understanding of the electronic and magnetic properties of topological insulators we are faced with one of its most striking features, the existence of metallic surface states with helical spin texture which are protected from non-magnetic impurities. On the surface these spin channels allows a huge potential for applications in spintronic devices. There is much to do and treating calculations via \\textit{Ab initio} simulations allows us a predictive character that corroborates the elucidation of physical phenomena through experimental analysis. In this work we analyze the electronic properties of topological insulators such as: (Bi, Sb)$_2$(Te, Se)$_3$, Germanene and functionalized Germanene. Calculations based on DFT show the importance of the separation from interlayers of Van der Waals in materials like Bi$_2$Se$_3$ and Bi$_2$Te$_3$. We show that due to stacking faults, small oscillations in the QLs axis (\\textit{Quintuple Layers}) can generate a decoupling of the Dirac cones and create metal states in the bulk phase Bi$_2$Te$_3$. Regarding the Bi$_2$Se$_3$ a systematic study of the effects of transition metal impurities was performed. We observed that there is a degeneracy lift of the Dirac cone if there is any magnetization on any axis. If the magnetization remains in plane, we observe a small shift to another reciprocal lattice point. However, if the magnetization is pointing out of the plane a lifting in energy occurs at the very $ \\Gamma $ point, but in a more intense way. It is important to emphasize that in addition to mapping the sites with their magnetic orientations of lower energy we saw that the lifting in energy is directly related to the local geometry of the impurity. This provides distinct STM images for each possible site, allowing an experimental to locate each situation in the laboratory. We also studied the topological transition in the alloy (Bi$_x$Sb$_{1-x}$)$_ 2$Se$_3$, where we identify a trivial and topological insulator for $x = 0$ and $x = 1$. Despite the obvious existence of such a transition, important details remain unclear. We conclude that doping with non-magnetic impurities provides a good technique for handling and cone engineering this family of materials so that depending on the range of doping we can eliminate conductivity channels coming from the bulk. Finally we studied a Germanene and functionalized Germanene with halogens. Using an asymmetrical functionalization and with the topological invariant $Z_2$ we noted that the Ge-I-H system is a topological insulator that could be applied in the development of spin-based devices.
Yasamin, A. S. "Maximal invariants over symmetric cones." [Bloomington, Ind.] : Indiana University, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3337265.
Повний текст джерелаTitle from PDF t.p. (viewed on Jul 28, 2009). Source: Dissertation Abstracts International, Volume: 69-12, Section: B, page: 7597. Adviser: Steen Andersson.
Kapanadze, David, Bert-Wolfgang Schulze, and Ingo Witt. "Coordinate invariance of the cone algebra with asymptotics." Universität Potsdam, 2000. http://opus.kobv.de/ubp/volltexte/2008/2567/.
Повний текст джерелаRossi, Marco. "Dynamics and stability of discrete and continuous structures: flutter instability in piecewise-smooth mechanical systems and cloaking for wave propagation in Kirchhoff plates." Doctoral thesis, Università degli studi di Trento, 2021. http://hdl.handle.net/11572/322240.
Повний текст джерелаJorge, Guilherme Henrique Renó. "Arquitetura para extração de características invariantes em imagens binárias utilizando dispositivos de lógica programável complexa." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-06022007-141241/.
Повний текст джерелаA challenge for digital systems designers is to meet the balance between speed and flexibility was always. FPGAs and CPLDs where used as glue logic, reducing the number of components in a system. The use of programmable logic (CPLDs and FPGAs) as an alternative to microcontrollers and microprocessors is a real issue. Moments of the intensity function of a group of pixels have been used for the representation and recognition of objects in two dimensional images. Due to the high cost of computing the moments, the search for faster computing architectures is very important. A problem faced by nowadays developed architectures is the speed of computer communication buses. Simpler interfaces, as USB (Universal Serial Bus) and Ethernet, have their transfer rate in megabytes per second. A solution for this problem is the use the PCI bus, where the transfer rate can achieve gigabytes per second. This work presents a soft core architecture, fully compatible with the Wishbone standard, for the extraction of invariant characteristics from binary images using logic programmable devices.
Riley, Timothy Rupert. "Asymptotic invariants of infinite discrete groups." Thesis, University of Oxford, 2002. http://ora.ox.ac.uk/objects/uuid:30f42f4c-e592-44c2-9954-7d9e8c1f3d13.
Повний текст джерелаSILVA, Thársis Souza. "Equações Diferenciais por partes:ciclos limite e cones invaiantes." Universidade Federal de Goiás, 2011. http://repositorio.bc.ufg.br/tede/handle/tde/1945.
Повний текст джерелаIn this work, we consider classes of discontinuous piecewise linear systems in the plane and continuous in the space. In the plane, we analyze systems of focus-focus (FF), focusparabolic (FP) and parabolic-parabolic (PP) type, separated by the straight line x = 0, and we prove that can appear until two limit cycles depending of parameters variations. Also we study a specific system, piecewise, with two saddles (one fixed in the origin and the other in the neighborhood of point (1;1)) separated by the straight line y= -x+1, and we show that can appear until two limit cycles depending of parameters variations. Finally, we examine a continuous piecewise linear system in R³ and we prove the existence of invariant cones and, through this structures, we determine some stable and unstable behavior.
Neste trabalho, consideramos classes de sistemas lineares por partes descontínuos no plano e contínuos no espaço. No plano, analisamos sistemas do tipo foco-foco (FF), parabólico-foco (PF) e parabólico-parabólico (PP) separados pela reta x = 0 e demonstramos que podem aparecer até dois ciclos limite, dependendo de variações de parâmetros. Também estudamos um sistema específico, linear por partes, com duas selas (uma sela fixa na origem e outra na vizinhança do ponto (1;1)) separadas pela reta y= -x+1 , e mostramos que podem aparecer até dois ciclos limite dependendo de variações de parâmetros. Por fim, examinamos um sistema linear por partes contínuo em R³ e demonstramos a existência de cones invariantes e, através destas estruturas, determinamos alguns comportamentos estáveis e instáveis.
Constantin, Elena. "Optimization and flow invariance via high order tangent cones." Ohio : Ohio University, 2005. http://www.ohiolink.edu/etd/view.cgi?ohiou1125418579.
Повний текст джерелаMOTA, Marcos Coutinho. "Cones Invariantes em Sistemas Lineares por Partes Contínuos em ℝ³". reponame:Repositório Institucional da UNIFEI, 2016. http://repositorio.unifei.edu.br:8080/xmlui/handle/123456789/645.
Повний текст джерелаMade available in DSpace on 2017-02-01T17:02:13Z (GMT). No. of bitstreams: 1 dissertacao_mota2_2016.pdf: 10371663 bytes, checksum: d2442abc81d37889a61f9b348c5dd3f7 (MD5) Previous issue date: 2016-12
Apresentamos um estudo sobre cones invariantes em sistemas lineares por partes contínuos e observáveis em ℝ³. Utilizando uma forma paramétrica, estabelecemos a aplicação de Poincaré P, essencial para o estudo da estabilidade da origem e também da existência, unicidade e estabilidade de cones invariantes de duas zonas. Mostramos que a estabilidade da origem está bem definida quando o sistema estudado não possui cones invariantes de duas zonas e apresentamos um exemplo não intuitivo de um sistema linear por partes contínuo no qual as matrizes que definem os sistemas lineares envolvidos são Hurwitzianas, mas a origem é um ponto de equilíbrio instável.
Patraucean, Viorica. "Detection and identification of elliptical structure arrangements in images : theory and algorithms." Thesis, Toulouse, INPT, 2012. http://www.theses.fr/2012INPT0020/document.
Повний текст джерелаThis thesis deals with different aspects concerning the detection, fitting, and identification of elliptical features in digital images. We put the geometric feature detection in the a contrario statistical framework in order to obtain a combined parameter-free line segment, circular/elliptical arc detector, which controls the number of false detections. To improve the accuracy of the detected features, especially in cases of occluded circles/ellipses, a simple closed-form technique for conic fitting is introduced, which merges efficiently the algebraic distance with the gradient orientation. Identifying a configuration of coplanar circles in images through a discriminant signature usually requires the Euclidean reconstruction of the plane containing the circles. We propose an efficient signature computation method that bypasses the Euclidean reconstruction; it relies exclusively on invariant properties of the projective plane, being thus itself invariant under perspective
FERREIRA, Liliane da Cunha. "Órbitas Periódicas e Cones Invariantes em Sistemas Lineares por Partes Contínuos em ℝ³". reponame:Repositório Institucional da UNIFEI, 2018. http://repositorio.unifei.edu.br/xmlui/handle/123456789/1194.
Повний текст джерелаMade available in DSpace on 2018-04-12T15:19:18Z (GMT). No. of bitstreams: 1 dissertacao_ferreira_2018.pdf: 1010966 bytes, checksum: 0099fc85befd4c7eb0050e2de3bbc5c1 (MD5) Previous issue date: 2018-03
Apresentamos um estudo sobre a existência de cones invariantes em uma família de sistemas lineares por partes contínuos e não observáveis em ℝ³. Inicialmente, encontramos uma subfamília de tais sistemas que apresenta um único cone invariante folheado por órbitas periódicas. Depois disto, perturbamos os membros da subfamília, através de uma perturbação linear, tornando-os observáveis e não homogêneos e, então, estudamos as órbitas periódicas que persistem as quais estão associadas com os zeros de uma função integral.
Bouillot, Olivier. "Invariants analytiques des diffeomorphismes et multizetas." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00647909.
Повний текст джерелаMelo, Rodrigo Fernandes de Moura. "Hipersuperfícies em Rp+q+2 de curvatura escalar nula invariantes por O(p+1) x O(q+1)." Universidade Federal de Alagoas, 2009. http://repositorio.ufal.br/handle/riufal/1030.
Повний текст джерелаFundação de Amparo a Pesquisa do Estado de Alagoas
Esta dissertação está baseada no artigo de Jocelino Sato e Vicente de Souza Neto intitulado Complete and Stable O(p+1) x O(q+1) - Invariant Hypersurfaces with Zero Scalar Curvature in Euclidean Space Rp+q+2, publicado na revista Annals of Global Analysis and Geometry, volume 29, em 2006. O principal resultado desta dissertação é o Teorema de Classicação, que afirma o seguinte: Uma hipersuperfície Mp+q+1 que é invariante pela açãoao do grupo O(p + 1) x O(q + 1), p; q > 1, com curvatura escalar identicamente nula deve pertencer a uma das seguintes classes: (1) Cones com uma singularidade na origem de Rp+q+2; (2) Hipersuperfícies possuindo uma órbita de singularidades e assintotando ambos os cones Cα e Cβ; (3) Hipersuperfícies regulares que assintotam o cone Cα; (4) Hipersuperfícies regulares que assintotam o cone Cβ; (5) Hipersuperfícies regulares que assintotam ambos os cones Cα e Cβ. A demonstração do teorema requer um estudo de uma equação diferencial ordinária envolvendo as coordenadas das curvas, no plano, que geram estas hipersuperfícies. Esta equação diferencial, por sua vez, está associada a um campo de vetores X : R2 → R2 no plano. O estudo do retrato de fase deste campo é fundamental. Através dele, foi possível traduzir o comportamento das trajetórias de X em informações com respeito às curvas geratrizes e desta maneira obter o teorema.
Bouillot, Olivier. "Invariants analytiques des difféomorphismes et multizêtas." Thesis, Paris 11, 2011. http://www.theses.fr/2011PA112224/document.
Повний текст джерелаThis work contains two independant parts, witch are deeply very closed. The first part deals with the calculation and the numerical evaluation of the holomor¬phic invariants of tangent to identity diffeomorphisms, in the type-case. ln particular, we display here three methods of numerical computation whose the last is based on an ex¬plicit formula of invariants. These result of calculation of the horn map 7[+, whose basics components are sorne rationnaIs, sorne Taylor coefficients of the diffeomorphism which is studied and multitangents. The second part deals with a général study of multitangents and relations between them. They are I-periodic functions, generalizing Eisenstein series and defining a symetr~l mould. There are others relations, like the reduction into monotangents which point out to us a profound link between multitangents and multiz~tas values. Properties and conjec¬tures of purely algebraic, arithmetical or analytical kirig are then explain
Mohsen, Omar. "Deformation groupoids and applications." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC200/document.
Повний текст джерелаThis thesis is devoted to the study of three different questions concerning Lie groupoids and their applications. The first chapter presents some preliminaries on Lie groupoids. In Chapter 2, Witten’s deformation is expressed using deformation to the normal cone construction and the theory of C∗-modules, which allows us to reprove the Morse inequalities. Our method is generalised to the case of foliations. In Chapter 3, we give a simple construction of the deformation groupoid built by Choi-Pönge and Van Erp-Yuncken. Recall that this groupoid describes the inhomogeneous pseudo-differential calculus thanks to the work of Debord-Skandalis and Van Erp-Yuncken. Our construction shows that the deformation groupoid is actually an iterated classical deformation to the normal cone. In Chapter 4, following the work of Antonini, Azzali and Skandalis, we construct an element in equivariant KK-theory that allows us to express the Chern-Simons invariants directly in K-theory. In the appendix we give some reminders about the equivariant KK-theory and the real KK-theory introduced by Antonini, Azzali and Skandalis
Boni, Keila Tatiana. "Invariantes operatórios e níveis de generalidade manifestados por estudantes dos anos iniciais do ensino fundamental em tarefas não-rotineiras." Universidade Estadual de Londrina. Centro de Ciências Exatas. Programa de Pós-Graduação em Ensino de Ciências e Educação Matemática, 2014. http://www.bibliotecadigital.uel.br/document/?code=vtls000198985.
Повний текст джерелаThis research aims to investigate in non-routine mathematical tasks, operatory invariants and levels of generality expressed by six students of the 5th year of elementary school in a Municipal School in Apucarana - PR in calculation procedures. Therefore, we use the related calculation procedures, arithmetic thinking and algebraic thinking, theories and elements of the Conceptual Fields and Levels of Generality for information analysis studies. These data, which were collected through audio recordings, written registers and daily field, were subjected to analytical procedures in the light of Textual Analysis Discursive. We conclude that students participating in the research were at a level of transition between arithmetic generality and algebraic generality factual. This conclusion was based from the manifestations of students, mainly expressed in natural language orally, in which the perception of invariant characteristics related to the calculation procedures is evident that due to the manner and frequency with which they were used, as instituted operatory invariants of type theorems-in-action.
Harding, Andrew. "Uniqueness of g-measures and the invariance of the beta-function under finitary isomorphisms, with finite expected code lengths, between g-spaces." Thesis, University of Warwick, 1985. http://wrap.warwick.ac.uk/89143/.
Повний текст джерелаFranceschi, Sandro. "Approche analytique pour le mouvement brownien réfléchi dans des cônes." Thesis, Tours, 2017. http://www.theses.fr/2017TOUR4046/document.
Повний текст джерелаObliquely reflected Brownian motion in the quadrant, introduced by Harrison, Reiman, Varadhan and Williams in the eighties, has been studied a lot in the probabilistic literature. This thesis, which presents the complete study of the invariant measure of this process in all the cones of the plan, has for overall aim to extend to the continuous framework an analytic method initially developped for random walks in the quarter plane by Fayolle, Iasnogorodski and Malyshev in the seventies. This approach is based on functional equations which link generating functions in the discrete case and Laplace transform in the continuous case. These equations allow to determine and to solve boundary value problems satisfied by these generating functions. In the recurrent case, it permits to compute explicitly the invariant measure of the process with orthogonal reflexions, in the chapter 2, and with any reflexions, in the chapter 3. The Laplace transform of the invariant measure is analytically extended to a Riemann surface induced by the kernel of the functional equation. The study of singularities and the use of saddle point methods on this surface allows to determine the full asymptotics of the invariant measure along every directions in the chapter 4
Hanna, Mirna. "Une approche sémiotique de l’architecture domestique à Beyrouth au XXème siècle. Étude comparative de deux cas typologiques." Thesis, Paris 4, 2011. http://www.theses.fr/2011PA040076.
Повний текст джерелаThe purpose of a semiotic analysis of architecture is to see how non verbal codes manifest themselves through the architectural language, based upon the idea that such a language is conditioned by macro-social values, and therefore the architectural sign should be considered as an anthropological marker. This multi-disciplinary approach combining different fields such as architecture, semiotics and anthropology, is aimed on one hand at contributing to semiotics by proposing a methodology for the analysis of an architectural corpus, and on the other hand, to broadening the field of urban geography to new disciplines, and finally, to providing a new analysis of Beirut’s urban fabric through the comparative case study of two architectural typologies. The proposed semiotic approach can be applied as a tool of urban geography to architectural corpuses and urban fabrics in order to understand the mechanisms of production and obsolescence of form
Grismayer, Thomas. "Etude théorique et numérique de l'expansion d'un plasma crée par laser : accélération d'ions à haute énergie." Phd thesis, Ecole Polytechnique X, 2006. http://pastel.archives-ouvertes.fr/pastel-00002924.
Повний текст джерелаLalescu, Cristian. "Test particle transport in turbulent magnetohydrodynamic structures." Doctoral thesis, Universite Libre de Bruxelles, 2011. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209908.
Повний текст джерела\
Doctorat en Sciences
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Zima, Petr. "(Konformní) Killingovy spinor hodnotové formy na Riemannovských varietách." Master's thesis, 2014. http://www.nusl.cz/ntk/nusl-340895.
Повний текст джерела(11187477), Jin Wu. "Invariant Signatures for Supporting BIM Interoperability." Thesis, 2021.
Знайти повний текст джерелаBuilding Information Modeling (BIM) serves as an important media in supporting automation in the architecture, engineering, and construction (AEC) domain. However, with its fast development by different software companies in different applications, data exchange became labor-intensive, costly, and error-prone, which is known as the problem of interoperability. Industry foundation classes (IFC) are widely accepted to be the future of BIM in solving the challenge of BIM interoperability. However, there are practical limitations of the IFC standards, e.g., IFC’s flexibility creates space for misuses of IFC entities. This incorrect semantic information of an object can cause severe problems to downstream uses. To address this problem, the author proposed to use the concept of invariant signatures, which are a new set of features that capture the essence of an AEC object. Based on invariant signatures, the author proposed a rule-based method and a machine learning method for BIM-based AEC object classification, which can be used to detect potential misuses automatically. Detailed categories for beams were tested to have error-free performance. The best performing algorithm developed by the methods achieved 99.6% precision and 99.6% recall in the general building object classification. To promote automation and further improve the interoperability of BIM tasks, the author adopted invariant signature-based object classification in quantity takeoff (QTO), structural analysis, and model validation for automated building code compliance checking (ACC). Automation in such BIM tasks was enabled with high accuracy.
Chou, Pei-Yin, and 周珮吟. "A Rotationally Invariant Binary Descriptor Using Pore-Valley Disk Code Structure on Partial Fingerprints." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/ay4shx.
Повний текст джерела"Estruturas quase hermitianas invariantes e ideais abelianos." Tese, Biblioteca Digital da Unicamp, 2003. http://libdigi.unicamp.br/document/?code=vtls000279879.
Повний текст джерела"Teoria geometrica dos invariantes e representações de quivers." Tese, Biblioteca Digital da Unicamp, 2006. http://libdigi.unicamp.br/document/?code=vtls000383572.
Повний текст джерелаSilva, Michael Simões. "Validation of Data Invariants in the OutSystems Platform." Master's thesis, 2019. http://hdl.handle.net/10362/113610.
Повний текст джерела"Espaços de Poisson-Furstenberg e medidas invariantes para grupos de Lie semi-simples." Tese, Biblioteca Digital da Unicamp, 2005. http://libdigi.unicamp.br/document/?code=vtls000349422.
Повний текст джерела