published_or_final_version / Mathematics / Master / Master of Philosophy

Thesis (Ph. D.)--University of Washington, 1999. / Vita. Includes bibliographical references (leaves 42-43).

ARAUJO, H. R. M. Sobre invariantes topológicos de folheações holomorfas com singularidade isolada. 2017. 62 f. Dissertação (Mestrado Acadêmico em Matemática) – Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2017. / Submitted by Andrea Dantas (pgmat@mat.ufc.br) on 2017-05-25T20:23:00Z No. of bitstreams: 1 2017_dis_hrmaraujo.pdf: 556971 bytes, checksum: 9f274c4a5c917004f3b67a3fc72c5547 (MD5) / Rejected by Rocilda Sales (rocilda@ufc.br), reason: Boa tarde, Conferi a Dissertação de HAMILTON REGIS MENEZES DE ARAUJO, e constatei apenas dois erros na formatação no trabalho que dever ser alterados pelo autor: 1- Epígrafe ( a estrutura desse elemento deve ser a que se segue, com alinhamento à direita: "O sucesso é ir de fracasso em fracasso sem perder o entusiasmo." (Winston Churchill) 2- Títulos das seções (os títulos das seções que se encontram no sumário e ao longo do texto estão incorretos. As normas da ABNT recomendam que apenas a primeira letra do título das seções esteja em maiúscula, com exceção de nomes próprios. Ex.: 2.2 Índice de um Campo em uma Singularidade Isolada deve ser alterado para: 2.2 Índice de um campo em uma singularidade isolada Atenciosamente, on 2017-05-26T16:04:16Z (GMT) / Submitted by Andrea Dantas (pgmat@mat.ufc.br) on 2017-05-29T13:43:41Z No. of bitstreams: 1 2017_dis_hrmaraujo.pdf: 556572 bytes, checksum: cae2a014846c47e96be936dd25bbd9da (MD5) / Approved for entry into archive by Rocilda Sales (rocilda@ufc.br) on 2017-05-29T14:07:05Z (GMT) No. of bitstreams: 1 2017_dis_hrmaraujo.pdf: 556572 bytes, checksum: cae2a014846c47e96be936dd25bbd9da (MD5) / Made available in DSpace on 2017-05-29T14:07:05Z (GMT). No. of bitstreams: 1 2017_dis_hrmaraujo.pdf: 556572 bytes, checksum: cae2a014846c47e96be936dd25bbd9da (MD5) Previous issue date: 2017-05-19 / Considering the foliation induced by a complex holomorph vector field, we will look for topological invariants in the neighborhood of a singular point. At first, the Milnor Number of a vector field becomes important, in the sense that this number is topological invariant. In another discussion, we will emphasize vector fields in dimension two, in which case the leaves, whose foliation is induced by the field, will be integral curves of a 1-form. In this sense, we will deal with Desingularization, that is, after a finite number of processes, which we will call Blow-ups or explosions, we will turn the initial foliation into a foliation whose singularities are all simple. Finally, the Desingularization process of a field will give us tools that make it possible to relate the data obtained in this process to the objects treated throughout the work, with this we will present other topological invariants of foliations. / Considerando a folheação induzida por um campo vetorial complexo holomorfo, buscaremos exibir invariantes topológicos na vizinhança de um ponto singular. Num primeiro momento, ganha importância o Número de Milnor de um campo vetorial, no sentido desse número ser invariante topológico. Em outra discussão, daremos ênfase a campos vetoriais em dimensão dois, nesse caso, as folhas, cuja folheação é induzida pelo campo, serão curvas integrais de uma 1-forma. Nesse sentido, trataremos de Desingularização, ou seja, após um número finito de processos, que chamaremos de Blow-ups, ou explosões, transformaremos a folheação inicial em uma folheação cujas singularidades são todas simples. Por fim, o processo de Desingularização de um campo nos dará ferramentas que possibilitam relacionar os dados obtidos nesse processo com os objetos tratados ao longo de todo o trabalho, diante disto apresentaremos outros invariantes topológicos de folheações.

abstract: The power system is the largest man-made physical network in the world. Performing analysis of a large bulk system is computationally complex, especially when the study involves engineering, economic and environmental considerations. For instance, running a unit-commitment (UC) over a large system involves a huge number of constraints and integer variables. One way to reduce the computational expense is to perform the analysis on a small equivalent (reduced) model instead on the original (full) model. The research reported here focuses on improving the network reduction methods so that the calculated results obtained from the reduced model better approximate the performance of the original model. An optimization-based Ward reduction (OP-Ward) and two new generator placement methods in network reduction are introduced and numerical test results on large systems provide proof of concept. In addition to dc-type reductions (ignoring reactive power, resistance elements in the network, etc.), the new methods applicable to ac domain are introduced. For conventional reduction methods (Ward-type methods, REI-type methods), eliminating external generator buses (PV buses) is a tough problem, because it is difficult to accurately approximate the external reactive support in the reduced model. Recently, the holomorphic embedding (HE) based load-flow method (HELM) was proposed, which theoretically guarantees convergence given that the power flow equations are structure in accordance with Stahl’s theory requirements. In this work, a holomorphic embedding based network reduction (HE reduction) method is proposed which takes advantage of the HELM technique. Test results shows that the HE reduction method can approximate the original system performance very accurately even when the operating condition changes. / Dissertation/Thesis / Doctoral Dissertation Electrical Engineering 2017

Orientador: Jorge Tulio Mujica Ascui / Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Matematica, Estatistica e Computação Cientifica / Made available in DSpace on 2018-08-08T04:55:28Z (GMT). No. of bitstreams: 1 BerriosYana_SoniaSarita_D.pdf: 951582 bytes, checksum: eb4f2207b2bb049f8b5c1e264d96ec85 (MD5) Previous issue date: 2007 / Resumo: Sejam E e F espaços de Banach complexos, e seja U um aberto em E. Neste trabalho estudamos os subespaços Hwu(U; F), Hw(U; F), Hwsc(U; F) e HwC(U; F) de H(U; F). Mais especificamente, se U é aberto equilibrado caracterizamos funções destes subespaços em termos de condições de equicontinuidade dos polinômios da série de Taylor. Estudamos sob que condições estes subespaços coincidem, estendendo assim os resultados dados em Aron, Herves e Valdivia [2] ao caso de abertos equilibrados. Se E tem uma base contrátil e incondicional, e U é uma bola aberta em E mostramos que cada função holomorfa f : U 'seta' F que é limitada nos conjuntos fracamente compactos U-limitados é limitada nos conjuntos U-limitados. Consequentemente, Hw(U; F) = Hwu(U; F) / Abstract: Let E and F be complex Banach spaces, and let U be an open set in E. In this work we study the subspaces Hwu(U; F), Hw(U; F), Hwsc(U; F) and HwC(U; F) of H(U; F). More specifically, if U is a balanced open set we characterize functions of these subespaces in terms of equicontinuity conditions of the polynomials in the Taylor series. We study under which conditions these subspaces coincide, and then we extend the results given in Aron, Herves and Valdivia [2] to the case of balanced open sets. If E has a shrinking and unconditional basis, and U is an open ball in E we show that each holomorphic function f : U 'seta' F that is bounded on weakly compact U-bounded sets is bounded on U-bounded sets. Consequently, Hw(U; F) = Hwu(U; F) / Doutorado / Doutor em Matemática

Orientador: Jorge Tulio Mujica Ascui / Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Matemática Estatística e Computação Científica / Made available in DSpace on 2018-08-26T17:26:19Z (GMT). No. of bitstreams: 1 Alves_ThiagoRodrigo_D.pdf: 734025 bytes, checksum: 298106a4813934e730d61824cffa0a7b (MD5) Previous issue date: 2015 / Resumo: Seja U um domínio de existência de um espaço localmente convexo. O principal objetivo da tese é estudar o conjunto E(U) constituído pelas funções holomorfas f : U --> C tais que U é o domínio de existência de f. Mais especificamente, é verificado que sob certas condições o conjunto E(U) contém variadas estruturas algébricas. Ressalta-se que a meta não é apenas demonstrar a existência de diferentes estruturas lineares/algébricas inseridas em E(U), mas também constatar que essas estruturas são em certo sentido "grandes''. Num primeiro momento o estudo é centrado nas funções holomorfas definidas em abertos de um espaço de Banach separável. Posteriormente, sairemos do contexto de espaços de Banach para iniciarmos o estudo das funções holomorfas definidas em abertos de espaços DFC, os quais se restringirão àqueles espaços da forma E = F'_c com F espaço de Fréchet separável / Abstract: Let U be a domain of existence of a locally convex space. In this thesis we study the set E(U) of all holomorphic functions f : U --> C such that U is the domain of existence of f. More specifically, we will see that under some hypotheses there are several algebraic structures inside the set E(U). Our goal is not only to prove the existence of distinct linear/algebraic structures in E(U), but also to show that these structures are in some way "large''. First we study the algebra of the holomorphic functions whose domains are open subsets of separable Banach spaces. Next we investigate the algebra of the holomorphic functions whose domains are open subsets of DFC spaces, which are in turn restricted to spaces of the form E = F'_c with F a separable Fréchet space / Doutorado / Matematica / Doutor em Matemática

No description available.

No description available.

No description available.

We deal with two themes that are illustrative of the rigidity and regularity of holomorphic mappings. The first one concerns the regularity of continuous CR mappings between smooth pseudo convex, finite type hypersurfaces which is a well studied subject for it is linked with the problem of studying the boundary behaviour of proper holomorphic mappings between domains bounded by such hypersurfaces. More specifically, we study the regularity of Lipschitz CR mappings from an h-extendible(or semi-regular) hypersurface in Cn .Under various assumptions on the target hypersurface, it is shown that such mappings must be smooth. A rigidity result for proper holomorphic mappings from strongly pseudo convex domains is also proved. The second theme dealt with, is the classification upto biholomorphic equivalence of model domains with abelian automorphism group in C3 .It is shown that every model domain i.e.,a hyperbolic rigid polynomial domainin C3 of finite type, with abelian automorphism group is equivalent to a domain that is balanced with respect to some weight.