Made available in DSpace on 2016-04-27T16:57:12Z (GMT). No. of bitstreams: 1 Silvio Joaquim Lopes.pdf: 15353540 bytes, checksum: 828697d9e22f6b46f05d01e9f21540e7 (MD5) Previous issue date: 2011-11-07 / Secretaria da Educação do Estado de São Paulo / This work focuses on lifting the approach of the notion of infinity in textbooks that refer to the school term which comprises from the Early Education to High School Education. It refers, therefore, to the analysis of textbooks. To collect data we used the assumptions of Content Analysis having as an aim the verification of the situations presented in the books analysed and consequently the concepts covered in them, evidence or clue of the notion of infinity. In this work you will also be able to see a historical survey of the development of notion of infinity as well as a bibliography of researches focusing on the teaching and the learning of this notion. For the theoretical foundation, we choose the Conceptual Fields Theory of Gerard Vergnaud because of the multiplicity of situations they involve and that define the notion of infinity. With this study we can observe signs and approach of clues of the notion of infinity us investigated books in the different levels of Basic Education. We understand that the explanation of these clues can contribute to help its possible use made by teachers and researchers / O presente trabalho tem como foco o levantamento da abordagem da noção de infinito em livros didáticos referentes ao período escolar que compreende da Educação Infantil ao Ensino Médio. Trata-se, portanto, de análise de livros didáticos. Para a coleta de dados, foram utilizados os pressupostos da Análise de Conteúdo tendo como objetivo verificar nas situações presentes nesses livros, e consequentemente nos conceitos nelas abordados, indícios ou pistas da noção de infinito. No trabalho está um levantamento histórico do desenvolvimento da noção de infinito, assim como um levantamento bibliográfico de pesquisas com foco no ensino e na aprendizagem dessa noção. Para a fundamentação teórica, escolhemos a Teoria dos Campos Conceituais de Gerard Vergnaud, por conta da multiplicidade de situações que envolvem e que definem a noção de infinito. Com este estudo pudemos evidenciar indícios e pistas da abordagem da noção de infinito nos livros investigados dos diferentes níveis da Educação Básica. É nossa compreensão que a explicitação desses indícios pode contribuir para possível aproveitamento de professores e pesquisadores

Made available in DSpace on 2016-04-27T17:27:20Z (GMT). No. of bitstreams: 1 Vicente Beur Miranda Lima.pdf: 1320109 bytes, checksum: af91f52d25eff82f756a36909c7968b0 (MD5) Previous issue date: 2007-10-31 / The ethic discussion in the last time has roused a great interest in many thinkers such as Ernest Thungendart, Jurgen Habbermas, Jacques Derrida, Rosmini, Bonhoefer, Guardini, Mancini. They try to put out this discussion at the present day, beside the new philisophic tendencies as: Language Philosophy, Knowledge Theory and Politic Philosophy. Among these thinkers, it has specifically in Emmanuel Levinás , a new proposal for ethic. The present paper intends to present this new proposal clearly, that in its own way break up with those others, at the same time that it goes to another point of reference to think about the real ethic, that comes from another one. According to Levinás, the reference point of ethic is not in a transcendentalism of I must , but it is in the relationship of face to face that happens when the other person is next to. This is the way how Lévinas excels the other types of ethic, because they are still in an ontologic horizon. At the same time, with this finality, it has as a main point in research, investigate the concept of Love in this new ethic scenery that Lévinas proposes. Check up about: the context, through Lévinas itinerary existential-philosophic, where it can be noted in a strong way the influence of Judaism in his intellectual formation; the dialogue with names that belong to philosophy and that influenced his thought directly. Finally, it is going to investigate what he brought of genuine in his Philosophy, the place of Love, as a member of his Ethic of Alterity, proposing a change in the philosophy view, that is, love for knowledge, to a Knowledge of Love / O debate ético nos últimos tempos tem despertado um grande interesse em muitos pensadores, tais como Ernest Thungendart, Jürgen Habbermas, Jacques Derrida, os quais procuram recolocá-lo na ordem do dia, ao lado de novas tendências filosóficas como Filosofia da Linguagem, Lógica, Teoria do Conhecimento e Filosofia Política. Dentre estes, tem-se especificamente em Emmanuel Lévinas, uma nova proposta ética. O presente trabalho tem por finalidade, apresentar de forma sucinta, esta nova proposta ética, que a seu modo rompe com as anteriores, na medida em que parte de um outro ponto de referência para pensar a própria ética, isto é, o outro. Para Lévinas, o ponto referencial da ética não reside num transcendentalismo do eu devo , mas na relação do face-a-face que se estabelece com a proximidade do outro. É desta forma que Lévinas supera as outras modalidades éticas, por aquelas permanecerem ainda num horizonte ontológico. Concomitantemente a esta primeira finalidade, tem-se como ponto principal da pesquisa, averiguar o conceito do Amor neste novo cenário ético proposto por Lévinas. Para tal, investigar-se-á: seu contexto vivencial, através de seu itinerário-existencial-filosófico, em que se percebe fortemente a influência do judaísmo em sua formação intelectual; a interlocução com nomes próprios da filosofia que influenciaram diretamente seu pensamento; para num último momento, averiguar, naquilo que traz de genuíno em sua filosofia, o lugar do Amor, como constituinte de sua Ética da Alteridade; propondo assim uma mudança de horizonte da própria filosofia, isto é, de uma amor à sabedoria, para uma Sabedoria do amor

Cette thèse étudie l'approche LPV pour la commande robuste des systèmes non linéaires. Son originalité est de proposer pour la première fois un cadre rigoureux permettant de résoudre efficacement des problèmes de synthèse non linéaire. L'approche LPV a été proposée comme une extension de l'approche H-infini dans le contexte des systèmes LPV (« Linéaires à Paramètres Variant dans le temps »), voire non linéaires. Quoique prometteuse, cette approche pour la commande des systèmes non linéaires restait peu utilisée. En effet, au-delà même de certaines limitations théoriques, la nature des solutions obtenues semblait inadéquate. Cette question ouverte est notre point de départ. Nous montrons tout d'abord que la faible variation des correcteurs constatée est due avant tout à la nature du schéma informationnel utilisé traditionnellement lors de la synthèse LPV, et que sous des hypothèses raisonnables, le cadre LPV peut permettre de recouvrir des stratégies de type « linéarisation par bouclage ». Ce point étant acquis, une deuxième difficulté réside dans l'obtention effective de correcteurs non linéaires donnant des garanties de performance. Nous proposons un cadre rigoureux permettant de résoudre efficacement un problème de synthèse incrémentale pondérée, par la résolution d'un problème LPV associé à un schéma informationnel spécifique compatible avec celui identifié dans la première partie. Cette étude et son aboutissement à la définition d'un cadre formel et d'une procédure complète d'obtention de correcteurs, incluant des méthodes de réduction de complexité, donnent des arguments puissants en faveur de l'approche LPV pour la commande robuste de systèmes non linéaires. / This thesis studies the LPV approach for the robust control of nonlinear systems. Its originality is to propose for the first time a rigorous framework allowing to solve efficiently nonlinear synthesis problems.The LPV approach was proposed as an extension of the H-infinity approach in the context of LPV (Linear Parameter-Varying) systems and nonlinear systems. Although this approach seemed promising, it was not much used in practise. Indeed, beyond certain theoretical limitations, the nature itself of the obtained solutions did not seem adequate. This open question constitutes the starting point of our work.We first prove that the observed weak variation of the controllers is in fact mostly due to the information structure traditionally used for LPV synthesis, and that under reasonable assumptions, the LPV framework can overlap feedback linearization strategies. This point having been resolved, a second difficulty lies in the actual achievement of nonlinear controllers yielding performance guarantees. We propose a rigorous framework allowing to solve efficiently an incremental synthesis problem, through the resolution of an LPV problem associated to a specific information structure compatible with the one identified in the first part.This study and its corollary description of a formal framework and of a complete controller synthesis procedure, including complexity reduction methods, provide powerful arguments in favor of the LPV approach for the robust control of nonlinear systems.

We study the relationship between subdivision rules, 3-dimensional manifolds, and circle packings. We find explicit subdivision rules for closed right-angled hyperbolic manifolds, a large family of hyperbolic manifolds with boundary, and all 3-manifolds of the E^3,H^2 x R, S^2 x R, SL_2(R), and S^3 geometries (up to finite covers). We define subdivision rules in all dimensions and find explicit subdivision rules for the n-dimensional torus as an example in each dimension. We define a graph and space at infinity for all subdivision rules, and use that to show that all subdivision rules for non-hyperbolic manifolds have mesh not going to 0. We provide an alternate proof of the Combinatorial Riemann Mapping Theorem using circle packings (although this has been done before). We provide a new definition of conformal for subdivision rules of unbounded valence, show that the subdivision rules for the Borromean rings complement are conformal and show that barycentric subdivision is almost conformal. Finally, we show that subdivision rules can be degenerate on a dense set, while still having convergent circle packings.

This thesis represents the work that has been done by the author in the area of vibration analysis and control of smart structures during his PhD candidature. The research was concentrated on flexible structures, using piezoelectric materials as actuators and sensors. The thesis consists of four major parts. The first part (Chapter 2) is the modelling of piezoelectric laminate structures using modal analysis and finite element methods. The second part (Chapter 4) involves the model correction of pointwise and spatial models of resonant systems. The model correction solution compensates for the errors associated with the truncation of high frequency modes. The third part (Chapter 5) is the optimal placement methodology for general actuators and sensors. In particular, optimal placement of piezoelectric actuators and sensors over a thin plate are considered and implemented in the laboratory. The last part (Chapters 6 to 8) deals with vibration control of smart structures. Several different approaches for vibration control are considered. Vibration control using resonant, spatial H-2 and H-infinity control is proposed and implemented on real systems experimentally. It is possible, for certain modes, to obtain the very satisfactory result of up to 30 dB vibration reduction. / PhD Doctorate

<p>Using the finite element software FEMLAB® solutions are computed to Dirichlet problems for the Infinity-Laplace equation ∆∞(<i>u</i>) ≡ <i>u</i>²_x<i>u</i>_xx+ 2<i>u</i>_x<i>u</i>_y<i>u</i>_xy+<i>u</i>²_y<i>u</i>_yy= 0. For numerical reasons ∆<i>q</i>(<i>u</i>) = div (|▼<i>u</i>|<i>q</i>▼<i>u</i>)<i> = </i>0, which (formally) approaches as ∆∞(<i>u</i>) = 0 as <i>q</i> → ∞, is used in computation. A parametric nonlinear solver is used, which employs a variant of the damped Newton-Gauss method. The analysis of the experiments is done using the known theory of solutions to Dirichlet problems for ∆∞(<i>u</i>) = 0, which includes AMLEs (Absolutely Minimizing Lipschitz Extensions), sets of uniqueness, critical segments and lines of singularity. From the experiments one main conjecture is formulated: For Dirichlet problems, which have a non-constant boundary function, it is possible to predict the structure of the lines of singularity in solutions in the Infinity-Laplace case by examining the corresponding Laplace case.</p>

Corvino, Corvino and Schoen, Chruściel and Delay have shown the existence of a large class of asymptotically flat vacuum initial data for Einstein's field equations which are static or stationary in a neighborhood of space-like infinity, yet quite general in the interior. The proof relies on some abstract, non-constructive arguments which makes it difficult to calculate such data numerically by using similar arguments. A quasilinear elliptic system of equations is presented of which we expect that it can be used to construct vacuum initial data which are asymptotically flat, time-reflection symmetric, and asymptotic to static data up to a prescribed order at space-like infinity. A perturbation argument is used to show the existence of solutions. It is valid when the order at which the solutions approach staticity is restricted to a certain range. Difficulties appear when trying to improve this result to show the existence of solutions that are asymptotically static at higher order. The problems arise from the lack of surjectivity of a certain operator. Some tensor decompositions in asymptotically flat manifolds exhibit some of the difficulties encountered above. The Helmholtz decomposition, which plays a role in the preparation of initial data for the Maxwell equations, is discussed as a model problem. A method to circumvent the difficulties that arise when fast decay rates are required is discussed. This is done in a way that opens the possibility to perform numerical computations. The insights from the analysis of the Helmholtz decomposition are applied to the York decomposition, which is related to that part of the quasilinear system which gives rise to the difficulties. For this decomposition analogous results are obtained. It turns out, however, that in this case the presence of symmetries of the underlying metric leads to certain complications. The question, whether the results obtained so far can be used again to show by a perturbation argument the existence of vacuum initial data which approach static solutions at infinity at any given order, thus remains open. The answer requires further analysis and perhaps new methods. / Corvino, Corvino und Schoen als auch Chruściel und Delay haben die Existenz einer grossen Klasse asymptotisch flacher Anfangsdaten für Einsteins Vakuumfeldgleichungen gezeigt, die in einer Umgebung des raumartig Unendlichen statisch oder stationär aber im Inneren der Anfangshyperfläche sehr allgemein sind. Der Beweis beruht zum Teil auf abstrakten, nicht konstruktiven Argumenten, die Schwierigkeiten bereiten, wenn derartige Daten numerisch berechnet werden sollen. In der Arbeit wird ein quasilineares elliptisches Gleichungssystem vorgestellt, von dem wir annehmen, dass es geeignet ist, asymptotisch flache Vakuumanfangsdaten zu berechnen, die zeitreflektionssymmetrisch sind und im raumartig Unendlichen in einer vorgeschriebenen Ordnung asymptotisch zu statischen Daten sind. Mit einem Störungsargument wird ein Existenzsatz bewiesen, der gilt, solange die Ordnung, in welcher die Lösungen asymptotisch statische Lösungen approximieren, in einem gewissen eingeschränkten Bereich liegt. Versucht man, den Gültigkeitsbereich des Satzes zu erweitern, treten Schwierigkeiten auf. Diese hängen damit zusammen, dass ein gewisser Operator nicht mehr surjektiv ist. In einigen Tensorzerlegungen auf asymptotisch flachen Räumen treten ähnliche Probleme auf, wie die oben erwähnten. Die Helmholtzzerlegung, die bei der Bereitstellung von Anfangsdaten für die Maxwellgleichungen eine Rolle spielt, wird als ein Modellfall diskutiert. Es wird eine Methode angegeben, die es erlaubt, die Schwierigkeiten zu umgehen, die auftreten, wenn ein schnelles Abfallverhalten des gesuchten Vektorfeldes im raumartig Unendlichen gefordert wird. Diese Methode gestattet es, solche Felder auch numerisch zu berechnen. Die Einsichten aus der Analyse der Helmholtzzerlegung werden dann auf die Yorkzerlegung angewandt, die in den Teil des quasilinearen Systems eingeht, der Anlass zu den genannten Schwierigkeiten gibt. Für diese Zerlegung ergeben sich analoge Resultate. Es treten allerdings Schwierigkeiten auf, wenn die zu Grunde liegende Metrik Symmetrien aufweist. Die Frage, ob die Ergebnisse, die soweit erhalten wurden, in einem Störungsargument verwendet werden können um die Existenz von Vakuumdaten zu zeigen, die im räumlich Unendlichen in jeder Ordnung statische Daten approximieren, bleibt daher offen. Die Antwort erfordert eine weitergehende Untersuchung und möglicherweise auch neue Methoden.

No description available.

Using the finite element software FEMLAB® solutions are computed to Dirichlet problems for the Infinity-Laplace equation ∆∞(u) ≡ u2xuxx + 2uxuyuxy + u2yuyy = 0. For numerical reasons ∆q(u) = div (|▼u|q▼u) = 0, which (formally) approaches as ∆∞(u) = 0 as q → ∞, is used in computation. A parametric nonlinear solver is used, which employs a variant of the damped Newton-Gauss method. The analysis of the experiments is done using the known theory of solutions to Dirichlet problems for ∆∞(u) = 0, which includes AMLEs (Absolutely Minimizing Lipschitz Extensions), sets of uniqueness, critical segments and lines of singularity. From the experiments one main conjecture is formulated: For Dirichlet problems, which have a non-constant boundary function, it is possible to predict the structure of the lines of singularity in solutions in the Infinity-Laplace case by examining the corresponding Laplace case.

No description available.