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1
Silva, Marcos Afonso da [UNESP]. "Análise complexa e aplicações." Universidade Estadual Paulista (UNESP), 2018. http://hdl.handle.net/11449/153862.
Анотація:
Submitted by Marcos Afonso Da Silva (marcos.da.silvaaf@gmail.com) on 2018-05-02T18:35:06Z
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O objetivo principal deste trabalho é desenvolver um estudo introdutório, porém detalhado, sobre Análise Complexa e algumas de suas aplicações. Apresentamos o corpo dos números complexos, exploramos as funções complexas de uma variável complexa, exibimos parte da teoria das funções analíticas e parte da teoria de integração complexa. Provamos importantes resultados, tais como o Teorema de Cauchy, o Teorema de Taylor, o Teorema dos Resíduos, entre outros igualmente relevantes. Como aplicação da teoria, destacamos a utilização do Teorema dos Resíduos para determinar a transformada inversa de Laplace de uma função F(s).
The main objective of this work is to develop an introductory but detailed study on Complex Analysis and some of its applications. We present the field of the complex numbers, explore the complex functions of a complex variable, exhibit part of the theory of analytic functions, and part of the complex integration theory. We prove important results, such as Cauchy’s Theorem, Taylor’s Theorem, Residue Theorem, among others equally relevant. As an application of the theory, we highlight the use of the Residue Theorem to determine the inverse Laplace transform of a function F(s).
2
Nascimento, Franciel Araújo do. "Funções trigonométricas complexas: uma abordagem voltada para o ensino médio." Universidade Federal de Roraima, 2015. http://www.bdtd.ufrr.br/tde_busca/arquivo.php?codArquivo=285.
Анотація:
Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorEsta dissertação apresenta um estudo das funções trigonométricas com variável complexa com foco na educação básica. A motivação vem do fato de que se tem dado pouca importância aos números complexos no ensino médio, uma vez que a abordagem atual se restringe às definições, propriedades e exercícios de aplicação teórica e imediata, conforme consta, por exemplo, nos PCNS. Apresenta-se uma abordagem matricial dos números complexos, sem perder de vista a maneira em que esse números são apresentados, como pares ordenados, na matemática básica. Em seguida, apresenta-se as funções com variáveis complexas, suas propriedades e consequentemente um estudo das funções seno, cosseno, tangente, cotangente, secante e cossecante com variável complexa. Comparações entre algumas funções reais e complexas são realizadas. Finalmente, apresenta-se uma aplicação das funções trigonométricas complexa na Física.
This dissertation present a study of trigonometric functions with complex variable with a focus on basic education. The motivation comes from the fact that it has given little importance to complex numbers in school, since the current approach is restricted the settings, properties and theoretical exercises and immediate application, as shown, for example, the NCPS. Presents a approach of the complex numbers through matrix, without losing sight of the way in which those numbers are presented, as ordered pairs, in the basic mathematic. It then presents the functions with complex variables, their properties and consequently a study of sine functions, cosine, tangent, cotangent, secant and cosecant with complex variable. Some comparisons between real and complex functions are performed. Finally, we present an application of complex trigonometric functions in physics.
3
Gourdon, André. "Synthèse et étude structurale de clusters de fer contenant un hétéroatome du type carbure, nitrure, phosphure." Paris 6, 1986. http://www.theses.fr/1986PA066404.
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Oliveira, Stanley Borges de. "Números complexos e geometria." Universidade Estadual da Paraíba, 2014. http://tede.bc.uepb.edu.br/tede/jspui/handle/tede/2340.
Анотація:
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In the presentdissertation we study complex numbers with a special attention to the geometric aspect. Many geometric problems can be answered using the algebraic notation of complex numbers with their rich geometric interpretations with relative ease. The geometric aspects of the complex numbers are often not taught in high school, not even the trigonometric form (or polar form). Therefore, students do not apply the knowledge of complex numbers to solve geometric problems. In this paper we will approach the complex numbers applied to solve both geometric as algebraic problems, making relate geometric concepts with algebraic concepts of complex numbers, and launched as a proposal to develop the ability of students to relate mathematical content offering opportunity of even better fix the concepts of complex numbers.
No presente trabalho de conclusão de curso trataremos sobre os números complexos com uma atenção especial ao seu aspecto geométrico. Alguns problemas geométricos podem ser solucionados usando a notação algébrica dos números complexos com ajuda das suas ricas interpretações geométricas com certa facilidade. O aspecto geométrico dos números complexos muitas vezes não é ensinado no ensino médio, nem sequer a forma trigonométrica (ou polar). Por essa razão, os alunos não aplicam os conhecimentos de números complexos para resolver problemas geométricos. Em muitos casos, essa abordagem vem a facilitar a resolução das soluções. Neste trabalho faremos uma abordagem dos números complexos aplicados para resolver problemas, ora geométricos, ora algébricos, fazendo relacionar os conceitos geométricos com os conceitos algébricos dos números complexos e vice versa, e lançamos como proposta para desenvolver a habilidade dos alunos em relacionar os conteúdos matemáticos oferecendo oportunidade dos mesmo fixarem melhor conceitos dos números complexos.
5
Arnold, Rachel Florence. "Complex Analysis on Planar Cell Complexes." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/32230.
Анотація:
This paper is an examination of the theory of discrete complex analysis that arises from the
framework of a planar cell complex. Construction of this theory is largely integration-based.
A combination of two cell complexes, the double and its associated diamond complex, allows
for the development of a discrete Cauchy Integral Formula.Master of Science
6
Reis, Saulo-Davi Soares e. "Navegação em redes espacialmente correlacionadas." reponame:Repositório Institucional da UFC, 2009. http://www.repositorio.ufc.br/handle/riufc/12888.
Анотація:
REIS, Saulo Davi Soares e. Navegação em redes espacialmente correlacionadas. 2009. 72 f. Dissertação (Mestrado em Física) - Programa de Pós-Graduação em Física, Departamento de Física, Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2009.Submitted by Edvander Pires (edvanderpires@gmail.com) on 2015-06-16T20:25:53Z No. of bitstreams: 1 2009_dis_sdsreis.pdf: 1915908 bytes, checksum: f38f094759742ce9d7cc35ad2d50209c (MD5)
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A significant number of real networks have well-defined spatial characteristics. We studied how network with spatially correlated topolgies can influence the processes of navigation through them. For this, we study the behavior of the average shortest-path length to networks defined within Kleinberg’s model [1, 2] to analyze the navigation dictated by rules of global knowledge. The Kleinberg’s model is characterized by allowing long-range connections between two vertices u and v distributed by a power-law probability distribution. For a better understanding of the topological characteristics presented by this family of networks, we applied the epidemic model susceptible-infected-susceptible (SIS) and we found that, we see that the Kleinberg’s model presents the small-world phenomenon only for a certain range of values of the clustering exponent α. We introduced a model of spatially embedded networks, conceptually based on the Kleinberg’s model. This model consist in introduction of a constrain to the distribution of long-range connections. We associate his constrain to a possible cost involved in the process of adding new long-range connections to the network. We studied how this cost constrain affects the navigation through the system, taking as a basis for comparison the work of Kleinberg for navigation with local knowledge, and our results conserning for navigation with global knowledge.
Um número significativo de redes reais apresentam características espaciais bem definidas. Nós estudamos como topologias de redes espacialmente correlacionadas podem influenciar processos de navegação através das mesmas. Para isso estudamos o comportamento do mínimo caminho médio para redes definidas dentro de modelo de Kleinberg para analisar a navegação ditada por regras de conhecimento global. O modelo que Kleinberg caracteriza-se por permitir conexões de longo alcance entre dois vértices u e v distribuídas por uma distribuição de probabilidade em lei de potência. Para um melhor entendimento das características topológicas apresentadas por essa família de redes, nós aplicamos o modelo epidêmico suscetível-infectado-suscetível (SIS), e com isso verificamos que o modelo de Kleinberg apresenta fenômeno de mundo pequeno apenas para uma determinada faixa de valores assumidos pelo expoente de agregação α. Em seguida, introduzimos um modelo de redes espacialmente embutidas, conceitualmente inspirado no modelo de Kleinberg. Este traduz-se na introdução de um vínculo para a distribuição das conexões de longo alcance. Associamos este vínculo a um possível custo envolvido no processo de adição de novas conexões de longo alcance à rede. Estudamos como esse vínculo no custo afeta a navegação na rede, tendo como base de comparação os trabalhos de Kleinberg para a navegação com conhecimento local da topologia, e nossos resultados considerando a navegação com conhecimento global.
7
Marzak, Saïd. "Complexes du cuivre (i) construits sur le fragment (ms::(4))**(2-) (m=mo,w) : role du ligand thiocyanate dans l'edification de composes heterometalliques a structure infinie." Paris 6, 1988. http://www.theses.fr/1988PA066401.
Анотація:
Preparation de complexes du type (nr::(4))::(n)(cu::(4)(ncs)::(4)ms::(4)), m=mo, w, r=me, et et n=2 ou 3. Selon la taille du cation, obtention de macrostructures bidimensionnelles ou tridimensionnelles; l'insertion du cation pph::(4)**(+) conduit a la formation d'une structure infinie de chaines lineaires
8
Ries, Michel. "Synthese et reactivite de clusters heterometalliques contenant le ligand assembleur ph : :(2)pch::(2)pph::(2)." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13208.
9
Dandache, Abbas Anceau François. "Evaluations électriques et temporelles des PLA complexes (COMPLETE) COMplex PLA Electrical and Temporal Evaluator /." S.l. : Université Grenoble 1, 2008. http://tel.archives-ouvertes.fr/tel-00307779.
10
Antiqueira, Lucas. "Relações da estrutura de redes complexas com as dinâmicas do passeio aleatório, de transporte e de sincronização." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-13032012-100543/.
Анотація:
O relacionamento entre estrutura e dinâmica em redes complexas foi considerado utilizando-se uma ampla gama de diferentes técnicas. Diversas redes reais foram estudadas em termos das correlações entre grau e atividade. A medida de atividade é definida como a proporção de visitas por vértice no regime estacionário do passeio aleatório simples. O estudo desse tipo de correlação é importante pois pode fornecer subsídios para que uma propriedade dinâmica de um vértice possa ser obtida somente analisando-se seu(s) grau(s). O conceito de acessibilidade foi abordado nesse contexto, permitindo que fossem evidenciadas diferentes correlações, em redes como a WWW, de acordo com a intensidade de acessibilidade dos vértices. Propôs-se também um novo modelo de rede baseado no crescimento do número de vértices em que novas conexões são criadas com probabilidade proporcional à atividade de cada vértice. Esse modelo pode ser entendido como uma generalização do modelo de Barabási e Albert para redes com arestas direcionadas. Utilizando-se um conjunto de diversas medidas estruturais, mostrou-se que o novo modelo apresenta, entre outros modelos tradicionais de redes, a maior compatibilidade com três redes corticais. Foi também desenvolvido um método para caracterização da distribuição de subgrafos e seus inter-relacionamentos. O principal aspecto dessa metodologia é a expansão gradual dos subgrafos, desenvolvida para que os vértices que encontram-se fora de subgrafos possam ter suas relevâncias quantificadas em termos da importância no estabelecimento das conexões entre subgrafos. Experimentos para ilustração do método foram realizados utilizando-se quatro modelos de redes e cinco redes reais, e os resultados obtidos foram relacionados aos processos dinâmicos de transporte e de espalhamento. Outro tópico aqui considerado é o dos efeitos da amostragem de redes corticais, quantificados por meio de análise multivariada e classificação, fazendo uso de um conjunto de medidas estruturais de redes. Esses efeitos também foram mensurados em termos do comportamento dinâmico das redes (sincronização e acessibilidade). Simulações dos métodos de encefalografia MEG e EEG mostraram que as redes amostradas podem apresentar características bem diferentes das da rede original, principalmente no caso de amostras pequenas. Adicionalmente, a rede integrada da bactéria Escherichia coli foi analisada, a qual incorpora (i) regulação de transcrição gênica, (ii) vias metabólicas e de sinalização e (iii) interações entre proteínas. Outliers foram identificados no relacionamento entre grau e atividade, os quais representam reguladores globais de transcrição. Além disso, verificou-se que esses outliers são genes altamente expressos em diferentes condições, apresentando, portanto, uma natureza global no controle de diversos outros genes da célula.The relationship between structure and dynamics was addressed by employing a wide range of different approaches. First, the correlations between degree and activity were studied in various real-world networks. The activity is defined as the proportion of visits to each node in the steady-state regime of the simple random walk. This type of correlation can provide means to assess node activity only in terms of the degree. The concept of accessibility was included in this analysis, showing an intimate relationship (in networks such as the WWW) between the type of correlation and the level of accessibility observed on nodes. A new complex network model founded on growth was also proposed, with new connections being established proportionally to the current activity of each node. This model can be understood as a generalization of the Barabási-Albert model for directed networks. By using several topological measurements we showed that this new model provides, among several other traditional theoretical types of networks, the greatest compatibility with three real-world cortical networks. Additionally, we developed a novel approach considering non-overlapping subgraphs and their interrelationships and distribution through a given network. The main aspect of the methodology is a novel merging procedure developed to assess the relevance of nodes (in relation to the overall subgraph interconnectivity) lying outside subgraphs. Experiments were carried out on four types of network models and five instances of real-world networks, in order to illustrate the application of the method. Furthermore, these results were related to the properties of the transport and spreading processes. Other topic here addressed is the sampling problem in cortical networks. Effects of sampling were quantified using multivariate analysis and classifiers based on structural network measurements. Samples were also evaluated in terms of their dynamical behavior using a synchronization model and the measure of accessibility. By simulating MEG/EEG recordings it was found that sampled networks may substantially deviate from the respective original networks, mainly for small sample sizes. We also report an analysis of the integrated network of Escherichia coli, which incorporates (i) transcriptional regulatory interactions, (ii) metabolic/signaling feedback and (iii) protein-protein interactions. Network outliers, which represent global transcriptional regulators, were identified in the relationship between out-degree and activity. These outliers are highly and widely expressed across conditions, therefore supporting their global nature in controlling many genes in the cell.
11
Lugan, Noël. "Clusters du ruthenium a ligands assembleurs : stabilite, reactivite." Toulouse 3, 1987. http://www.theses.fr/1987TOU30156.
Анотація:
Etude de la reactivite d'agregats derives de ru::(3)(co)::(12) stabilises par des coordinats polydentes phosphores et/ou azotes, en vue d'application en catalyse homogene. Les coordinats assembleurs sont appm et diphenylpyridylphosphine. On etudie egalement la reactivite des complexes a coordinats acyle ru::(3)(co)::(9)(c(o) (c::(6)h::(5))) (p(c::(6)h::(5)) (c::(5)h::(4)n))
12
Gontard, Sébastien. "Courbures de métriques invariantes dans les variétés complexes non compactes." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAM027/document.
Анотація:
Nous étudions les relations entre des propriétés géométriques et des propriétés métriques dans les domaines de C^n.Plus précisément, nous nous intéressons au comportement des courbures bisectionnelles holomorphes de métriques de Kähler invariantes, la métrique de Bergman et la métrique de Kähler-Einstein, au voisinage du bord des domaines pseudoconvexe bornés à bord lisse.Nous prouvons qu'aux points de stricte pseudoconvexité ou tels que la fonction squeezing du domaine tend vers 1 les courbures bisectionnelles holomorphes de la métrique de Kähler-Einstein du domaine tendent vers les courbures bisectionnelles holomorphes de la métrique de Kähler-Einstein de la boule.Nous étudions également les courbures de la métrique de Kähler-Einstein et de la métrique de Bergman dans certains domaines polynomiaux (notamment les domaines tubes et les domaines de Thullen de C^2) qui servent de modèles locaux aux points du bord qui sont de type fini. A partir de ces études nous prouvons qu'en certains points du bord de domaines convexes bornés lisse de type fini dans C^2 il existe un voisinage non tangentiel tel que les courbures bisectionnelles holomorphes de la métrique de Kâhler-Einstein sont pincées négativement. Nous prouvons également que pour tout domaine pseudoconvexe borné de type fini qui est Reinhardt complet il existe un voisinage du bord relatif au domaine tel que les courbures bisectionnelles holomorphes de la métrique de Bergman sont comprises entre deux constantes strictement négativesWe study the relationships between geometric properties and metric properties of domains in C^n.More precisely, we are interested in the behavior of holomorphic bisectional curvatures of invariant Kähler metrics, namely the Bergman metric and the Kähler-Einstein metric, near the boundary of bounded pseudoconvex domains with smooth boundary.We prove that at boundary points that are either strictly pseudoconvex or such that the squeezing function of the domain tends to one the holomorphic bisectional curvatures of the Kähler-Einstein metric of the domain tends to the holomorphic bisectional curvatures of the Kähler-Einstein metric of the ball.We also study the holomorphic bisectional curvatures of the Kähler-Einstein metric and of the Bergman metric in some polynomial domains (namely tube and Thullen domains in C^2) which serve as local models at boundary point of finite type. Using these studies we prove that at certain boundary points of smoothly bounded convex domains of finite type there exists a non tangential neighbourhood such the holomorphic bisectional curvatures of the Kähler-Einstein metric are pinched between two negative constants. We also prove that for every smoothly bounded pseudoconvex complete Reinhardt domain of finite type inf C^2 there exists a neighbourhood of the boundary relative to the domain in which the holomorphic bisectional curvatures of the Bergman metric are pinched between two negative constants
13
Delavaux, Béatrice. "Complexes heterobimetalliques hydrures (ru-m) (m=rh,ir,cu) a ligands bisdiphenylphosphinomethane : synthese et reactivite." Toulouse 3, 1986. http://www.theses.fr/1986TOU30078.
Анотація:
Synthese de complexes hydruro a coordinat dppm : ph::(2) pch::(2) pph::(2). L'etude de la reactivite de certains complexes comme rurhh::(2)cl(cod) (dppm)::(2), conduit a la preparation de nouveaux hydrures dont on etudie les structures
14
Nuel, Didier. "Etude de la reactivite de fragments alkylidynes dans des clusters trinucleaires du fer." Toulouse 3, 1986. http://www.theses.fr/1986TOU30206.
Анотація:
Reactivite des complexes fe::(3)(co)::(9)(cch::(3))(coc::(2)h::(5)) ou fe::(3)(co)::(10)(cch::(3))(h). Les reactions de couplage des groupes alkylidynes avec les algues sont faciles. L'action de co a mis en evidence le couplage reversible dans des conditions douces de 2 fragments alkylidynes. En general, la presence du coordinat hydruro rend les reactions plus complexes
15
Wippler, Jean-Luc. "Une approche paradigmatique de la conception architecturale des systèmes artificiels complexes." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLX083/document.
Анотація:
L'architecture système cherche à se distinguer de son domaine d'origine, l'ingénierie système, en devenant un domaine émergent. Loin d'être reconnue en tant que science ou discipline à proprement parler, sa pratique est de plus en plus répandue de nos jours. Cependant, cette pratique reste encore peu formalisée et peu enseignée, faute d'un corpus de connaissances, de techniques ou de démarches établi et accessible.Notre thèse contribue à combler ce manque en proposant un paradigme de la conception architecturale des systèmes artificiels complexes. Ce dernier est construit en se basant sur des paradigmes existants, en les combinant, puis en les complétant. Il vise à doter l'architecte de systèmes artificiels complexes d'un cadre opérant, voire performatif. Il se traduit par une structuration de la démarche de conception en quatre niveaux.Un niveau dit archétypal condense les grands principes de toute démarche de conception architecturale de systèmes artificiels complexes. Ces principes sont dérivés de diverses démarches déjà appliquées, principalement à la conception de systèmes ou de produits, mais également à la conception architecturale de bâtiments.Un niveau dit général repose sur le principe d'une partition présent-futur, se différenciant en cela des approches d'ingénierie qui s'appuient traditionnellement sur une dichotomie problème-solution. L'idée prépondérante tient dans l'assentiment que lorsqu'un architecte conçoit, il ne résout pas de problèmes, mais il imagine des futurs possibles et plausibles, nécessitant qu'il perçoive le présent. Cette vision impacte directement la nature des artéfacts sur lesquels il travaille. Nous proposons ensuite d'agréger ces artéfacts en des modèles, reflétant soit sa perception du présent, soit son élaboration des futurs, évoluant suivant des processus identifiés.Un niveau dit particulier a pour objectif de permettre la narration d'une conception particulière. Nous proposons pour cela une notation de la conception. Elle s'appuie sur un certain nombre de mécanismes élémentaires, dont celui de l'enchaînement divergence-convergence, que nous nommons mécanisme de respiration de la conception architecturale.Un niveau dit de boîte à outils n'est pas traité dans le cadre de cette thèse. Il comprendrait les différentes opérations cognitives nécessaires à l'architecte pour accomplir sa tâche de conception (abstraction, questionnement, jugement, comparaison, décision, etc.)L'approche proposée est illustrée par un exemple de conception architecturale d'un système complexe : « rendre une ville plus sûre » (connu dans la littérature anglo-saxonne comme Safe City)Architecting seeks now to be distinct from its original domain, systems engineering, becoming an emergent domain. Far from being recognized as a science or a discipline, its practice is nowadays more and more widespread. However, this practice is still poorly formalized, and insufficiently being taught, lacking a well-established and accessible corpus of knowledge, techniques or approaches.This thesis contributes filling that gap by proposing a paradigm of the architectural design of artificial complex systems. The latter is built based on existing paradigms that are combined, then completed. It aims at providing architects with an effective, even performative framework. It results in an approach of the architectural design structured in four levels.A so-called archetypal level grasps the core principles of any approach of architectural design of artificial complex systems. These principles are derived from various approaches already applied, mainly in the field of system or product design, but also of architectural design of buildings.A so-called general level lies on the principle of a present-future division. In that sense, it differs from engineering approaches that usually rely on a problem-solution dichotomy. It is based on the following main idea: we should consent that when an architect designs, he does not solve problems, but he devises possible and plausible futures, requiring to perceive the present. This vision of the architect's way of working directly impacts the kind of artefacts he handles. We sho how to aggregate these artefacts into models, reflecting either his perception of the present, or his development of futures while progressing through some identified processes.A so-called particular level aims at allowing the storytelling of a given design. To achieve this goal, a notation of the design process is suggested. It lies on some basic mechanisms, one of them being the combination divergence-convergence, called the breathing of the architectural design.At last, a so-called toolbox level, not addressed in this thesis, would consist of various cognitive operations required for the architect in order to accomplish his task of designing (abstraction, questioning, judgement, comparison, decision, etc.)The whole approach is illustrated by an example of an architectural design of a complex system: a Safe City
16
Reis, Saulo Davi Soares e. "NavegaÃÃo em redes espacialmente correlacionadas." Universidade Federal do CearÃ, 2009. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=2817.
Анотація:
Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgicoUm nÃmero significativo de redes reais apresentam caracterÃsticas espaciais bem definidas. NÃs estudamos como topologias de redes espacialmente correlacionadas podem influenciar processos de navegaÃÃo atravÃs das mesmas. Para isso estudamos o comportamento do mÃnimo caminho mÃdio para redes definidas dentro de modelo de Kleinberg para analisar a navegaÃÃo ditada por regras de conhecimento global. O modelo que Kleinberg caracteriza-se por permitir conexÃes de longo alcance entre dois vÃrtices u e v distribuÃdas por uma distribuiÃÃo de probabilidade em lei de potÃncia. Para um melhor entendimento das caracterÃsticas topolÃgicas apresentadas por essa famÃlia de redes, nÃs aplicamos o modelo epidÃmico suscetÃvel-infectado-suscetÃvel (SIS), e com isso verificamos que o modelo de Kleinberg apresenta fenÃmeno de mundo pequeno apenas para uma determinada faixa de valores assumidos pelo expoente de agregaÃÃo α. Em seguida, introduzimos um modelo de redes espacialmente embutidas, conceitualmente inspirado no modelo de Kleinberg. Este traduz-se na introduÃÃo de um vÃnculo para a distribuiÃÃo das conexÃes de longo alcance. Associamos este vÃnculo a um possÃvel custo envolvido no processo de adiÃÃo de novas conexÃes de longo alcance à rede. Estudamos como esse vÃnculo no custo afeta a navegaÃÃo na rede, tendo como base de comparaÃÃo os trabalhos de Kleinberg para a navegaÃÃo com conhecimento local da topologia, e nossos resultados considerando a navegaÃÃo com conhecimento global.
A significant number of real networks have well-defined spatial characteristics. We studied how network with spatially correlated topolgies can influence the processes of navigation through them. For this, we study the behavior of the average shortest-path length to networks defined within Kleinbergâs model [1, 2] to analyze the navigation dictated by rules of global knowledge. The Kleinbergâs model is characterized by allowing long-range connections between two vertices u and v distributed by a power-law probability distribution. For a better understanding of the topological characteristics presented by this family of networks, we applied the epidemic model susceptible-infected-susceptible (SIS) and we found that, we see that the Kleinbergâs model presents the small-world phenomenon only for a certain range of values of the clustering exponent α. We introduced a model of spatially embedded networks, conceptually based on the Kleinbergâs model. This model consist in introduction of a constrain to the distribution of long-range connections. We associate his constrain to a possible cost involved in the process of adding new long-range connections to the network. We studied how this cost constrain affects the navigation through the system, taking as a basis for comparison the work of Kleinberg for navigation with local knowledge, and our results conserning for navigation with global knowledge.
17
Silva, Filipi Nascimento. "Redes complexas: novas metodologias e modelagem de aquisição de conhecimento." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-15032010-105321/.
Анотація:
Estudos em redes complexas têm ganhado cada vez mais atenção devido ao seu potencial de representação simples de modelos complexos em diversas áreas de conhecimento. A obtenção de modelos quantitativos que representem fenômenos observados da natureza, assim como o desenvolvimento de metodologias de caracterização de redes complexas, tornaram-se essenciais para a compreensão e desenvolvimento de pesquisas com essas estruturas. Este trabalho tem como objetivo desenvolver e estudar alguns métodos recentes, usados para a caracterização de redes complexas, explorando-os no contexto da modelagem de conhecimento. Para isso, duas redes complexas foram geradas, uma rede de colaboração de pesquisadores da USP e outra obtida a partir do banco de dados de artigos da Wikipédia, considerando apenas aqueles da categoria de teoremas matemáticos. As medidas concêntricas, que foram recentemente formalizadas, são exploradas e aplicadas às redes descritas, assim como para diversos modelos teóricos, fornecendo informações muito relevantes sobre a topologia dessas redes. Resultados ainda mais interessantes são obtidos pela caracterização dos vértices da rede de colaboração, que revelam padrões de interdisciplinaridade entre as diferentes áreas do conhecimento. Um modelo de aquisição de conhecimento também foi proposto, aplicando a utilização de simulações de múltiplos agentes interagentes que caminham por uma rede complexa segundo uma heurística auto-esquivante. Resultados dessas simulações, realizadas para a rede da Wikipédia e outros modelos teóricos, mostram que certas configurações de parâmetros e de redes apresentam melhor desempenho na aquisição do conhecimento, com a rede de teoremas apresentando o pior deles. Entretanto, diferentemente do que era esperado, a variação da memória dos agentes pouco influência a velocidade de aquisição de conhecimento dos agentes. A freqüência de acesso dos vértices pelos agentes também foi determinada e explorada superficialmente. Diversos softwares foram desenvolvidos para uso neste projeto de mestrado, dentre eles destaca-se o visualizador 3D, que se tornou indispensável para a análise das contribuições das outras propriedades apresentadas.Studies of complex networks have gained increasing research interest in recent years, in part due to its potential for simple representation of complex systems in various fields of science. The needs of quantitative models representing observed phenomena, as well the development of methods for the characterization of complex networks, is a essential matter for the development and understanding of scientific researches exploring such structures. This work aims to develop and study some new methods for the characterization of complex networks, exploring them in the context of knowledge modeling. Initially, two complex networks were developed, a collaborative network of researchers from the Universidade de Sao Paulo and the other obtained from the database of Wikip´edia articles, considering only those strict related to mathematical theorems. The recently formalized concentric measurements are explored and applied to the described networks, as well to other several theoretical models, providing much more information about the topology of these networks than by the use of traditional measurements. Even more interesting results are obtained by the characterization of the vertices of the collaboration network, which reveal patterns of interdisciplinarity among the many fields of science. A model of knowledge acquisition has also been proposed by the use of simulations of multiple interacting agents walking through a complex network in self-avoiding trajectories. Results of those simulations, performed for the network of Wikipedia and other theoretical models shows that certain sets of parameters and networks perform better in the acquisition of knowledge, through the network of theorems presenting the worst of them. However, unlike what should be expected on the basis of intuition, the agents memories do not play much influence to the speed of acquisition of knowledge. The agent access frequencies of vertices was also been obtained and explored superficially in order to determine where the agents walk more ofen. Several softwares had been developed in this masters thesis project, among these, there is a complex network computational visualization tool, which had become indispensable for the many analysis of the contributions obtained by the use of the other described properties.
18
Avelar, Clodoaldo Bevilaqua. "O fascinante mundo dos números complexos." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/55/55136/tde-16012017-153650/.
Анотація:
Essa dissertação versa sobre o conjunto dos números complexos e uma breve introdução sobre o Cálculo Diferencial de Funções em uma Variável Complexa. Como proposta didática apresentamos uma atividade que relaciona números complexos e geometria voltada para professores do Ensino Médio.This dissertation asserts on the set of complex numbers and brief introduction on Differential Calculus to one Complex Variable Functions. As didactic proposal we present an activity involving complex numbers and geometry that may be applied to teachers in high school level.
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Dias, Eduardo de Souza. "Estudo do risco sistêmico em redes interbancárias pela abordagem de sistemas complexos." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/100/100132/tde-05012016-225818/.
Анотація:
O estudo econômico e financeiro vem se modificando e buscando novas metodologias. Desde a crise que se iniciou com os \"subprimes\" nos Estados Unidos em 2008 e se espalhou para as economias de todo o mundo, novas discussões de como ela poderia ter sido evitada e qual caminho deveriam os países seguir para sair da estagnação já surgem no mundo acadêmico em direção ao estudo da complexidade. Em termos econômicos, algumas críticas feitas ao estudo da economia tradicional, principalmente atribuídas ao excesso de restrições utilizados nos modelos, podem ser agora afrouxadas, uma a uma, através de modelagens baseadas em agentes. Já no entendimento e controle do risco financeiro, redes complexas prestam fundamental distinção. Os modelos até então utilizados para controle de riscos no mercado financeiro não levam em consideração o risco global, porém apenas o risco local. Muitas teorias sobre a diminuição do risco através da diversificação são aceitas e realmente produzem sistemas mais estáveis, porém com pouca resiliência, ou seja, o número de crises diminui, porém as que ocorrem são muito mais graves. Este trabalho sugeriu um modelo baseado em agentes, onde um sistema econômico simples foi construído, para ser capaz de gerar crises. Este modelo formado por firmas e demanda estocástica, utiliza bancos para simular o mercado financeiro. Tais bancos estão conectados entre si através de uma rede interbancária. Para testar os efeitos de risco sistêmico, foram realizados três testes. No primeiro aumentou-se a alavancagem máxima permitida e os bancos conseguiram obter mais lucro e maior crescimento, porém a partir de certo patamar o sistema entrou em colapso, com frequente crises. No segundo aumentou-se a conectividade média e os bancos também obtiveram maior lucro, porém com crises muito mais profundas. No aumento do índice de cluster da rede interbancária, assim como nos dois primeiros testes os bancos conseguiram maior crescimento, porém agora sem os mesmos efeitos indesejáveis causados pelo aumento do risco.Economic and financial studies have been changing and searching new methodologies. Since the 2008 subprime crisis, which spread into economies around the globe, new discussions on how it could have been prevented, and paths which countries should follow to emerge from stagflation have been discussed by the academic world towards the complexity subject. In economic terms, some of the criticism of neoclassic economics, mainly due to excessive constrains used by its models, can now be eased, one by one, through agent based modeling. Regarding financial risk understanding and control, complex networks assume fundamental distinction. Models applied so far in financial market risk control dont consider global risk, but only the local one. Many theories on risk diversification are accepted and indeed produce more stable systems, although with little resilience, which means smaller number of crisis, but when it does occur, are more serious ones. This paper suggested an agent based model, using a simple economic system capable of generating crisis. This model was constituted by firms and stochastic demand, using banks to simulate the financial market. These banks were connected though a banking network. In order to test systemic risk, the model performed three tests. First, the maximum leverage allowed was increased and banks were able to achieve higher profits and growth, but from a certain level, the system collapsed with frequent crisis. Second, the average connectivity was increased and banks obtained higher profits, however with more severe crisis. Finally, increasing banking network cluster index, similarly to the first two tests, banks achieved higher growth, but without the undesirable effects caused by risk increase.
20
Labonnette, Daniel. "Etude des especes du vanadium iv en milieu faiblement acide et alcalin : isopolyanions mixtes mo**(vi)-v**(iv), complexes carbonates de v**(iv)." Orléans, 1987. http://www.theses.fr/1987ORLE2009.
Анотація:
L'alcalinisation progressive d'une solution acide de vo**(2+) par une base forte, entraine la formation successive des especes : vooh**(+), (vooh)::(2)**(2+) vo(oh)::(2), v::(4)o::(9)h**(-), v::(4)o::(9)h**(-), v::(4)o::(9)**(2-), vo(oh)::(3)**(-) et des ions polycondenses en milieu fortement basique et tres concentre en v(iv). Quand l'alcalinisation est realisee par hco::(3)**(-) ou co::(3)**(2-), il y a formation de complexes carbonato
21
Pisanty, Alatorre Emilio. "Electron dynamics in complex time and complex space." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/43538.
Анотація:
This thesis investigates the dynamics of electrons ionized by strong low frequency laser fields, from a semiclassical perspective, developing a trajectory-based formalism to describe the interactions of the outgoing electron with the remaining ion. Trajectory models for photoionization generally arise in the regime known as optical tunnelling, where the atom is subjected to a strong, slow field, which tilts the potential landscape around the ion, forming a potential energy barrier that electrons can then tunnel through. There are multiple approaches that enable the description of the ionized electron, but they are generally limited or models derived by analogy, and the status of the trajectories is unclear. This thesis analyses this trajectory language in the context of the Analytical R-Matrix theory of photoionization, deriving a trajectory model from the fundamentals, and showing that this requires both the time and the position of the trajectory to be complex. I analyse this complex component of the position and I show that it requires careful handling: of the potentials where it appears, and of the paths in the complex plane that the trajectory is taken through. In this connection, I show that the Coulomb potential of the ion induces branch cuts in the complex time plane that the integration path needs to avoid, and I show how to navigate these branch cuts. I then use this formalism to uncover a kinematic mechanism for the recently discovered (Near-)Zero Energy Structures of above-threshold ionization. In addition, I analyse the generation of high-order harmonics of the driving laser that are emitted when the photoelectron recollides with the ion, using a pair of counter-rotating circularly polarized pulses to drive the emission, both in the context of the conservation of spin angular momentum and as a probe of the long-wavelength breakdown of the dipole approximation.
22
Holder, Alexander Joseph. "Experimental studies of complex fluids in complex flows." Thesis, Swansea University, 2014. https://cronfa.swan.ac.uk/Record/cronfa42995.
23
Ta, The Anh. "Topics in Complex and CR geometry." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASM007.
Анотація:
Ce mémoire contient des résultats de recherche en géométrie complexe et en géométrie CR. Les sujets comprennent les limites de degré pour les hypersurfaces dans les problèmes liés à l'hyperbolicité de Kobayashi, problèmes d'équivalence et construction de formes normales pour certaines classes d'hypersurfaces 5-dimensionnelles dégénérées de Levi dans des espaces complexes et des enquêtes sur le lieu de disparition des courbures de Cartan CR aux limites de certains Des collecteurs CR 3-dimensionnels. Le thème commun est l'utilisation de jets plus hauts dans diverses situations géométriques pour étudier les invariants des objets géométriques, et l'utilisation extensive de programmes de calcul symbolique pour aider aux calculs compliquésThis memoir contains research results in complex geometry and CR geometry. The topics include degree bounds for hypersurfaces in Kobayashi hyperbolicity related problems, equivalence problems and construction of normal forms for certain classes of Levi degenerate 5-dimensional hypersurfaces in complex spaces and investigations on the vanishing locus of Cartan CR curvatures on boundaries of some 3-dimensional CR manifolds. The common theme is the use of higher jets in diverse geometric situations to investigate invariants of geometric objects, and the extensive use of symbolic computational programs to help with complicated calculations
24
Rocha, Luis Enrique Correa da. "Redes acopladas: estrutura e dinâmica." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-11092007-183106/.
Анотація:
A teoria das redes complexas tem se consolidado por seu forte caráter interdisciplinar, relativa simplicidade conceitual e ampla aplicabilidade na modelagem de sistemas reais. Embora tendo evoluído rapidamente, uma série de problemas ainda não foram estudados usando as redes complexas. Em especial, sistemas envolvendo acoplamento e interação entre diferentes redes complexas têm sido pouco investigados. Na presente monografia, apresentamos duas contribuições fundamentais no estudo desses sistemas. A primeira consiste num modelo que descreve a interação entre um padrão de massa evoluindo numa rede regular com uma rede complexa que se organiza para impedir a evolução desse padrão. Os vértices da rede complexa se ativam e se movem sobre a rede regular conforme são requisitados por seus vizinhos, que se ativam pela rede regular. Essa última ativação ocorre quando a concentração de massa ultrapassa um limiar na respectiva posição do vértice e consiste em liberar uma difusão oposta de massa neutralizadora contra a massa original. A dinâmica mostrou-se completamente relacionada à estrutura da rede de controle. A presença de concentradores no modelo de Barabási-Albert tem papel fundamental para acelerar o processo de geração de massa neutralizadora. Por outro lado, a distribuição uniforme de vizinhos da rede de Erdös-Rényi resultou numa melhora de desempenho na presença de várias regiões distintas contendo massa original. A segunda contribuição consiste num modelo de interação entre duas espécies (predador e presa) através de campos sensitivos, que dependem da distância Euclidiana entre dois indivíduos e do seu respectivo tipo. Padrões espaço-temporais emergem nesse sistema e estão diretamente relacionados à intensidade de atração entre os indivíduos da mesma espécie. Para entender a evolução do sistema e quantificar a transferência de informação entre os diferentes aglomerados, duas redes complexas são construídas onde os vértices representam os indivíduos. Na primeira rede, o peso das conexões é dado pela distância Euclidiana entre os indivíduos e na segunda, pelo tempo que eles permaneceram suficientemente próximos. A partir de um mecanismo de fusão entre as duas redes, obtemos uma terceira rede complexa onde os vértices correspondem a grupos espaciais definidos a partir de um processo de limiarização dos pesos da primeira rede. Algumas configurações de parâmetros privilegiam a sobrevivência de presas enquanto outras beneficiam a caça dos predadores.Complex network theory has become very popular because of its interdisciplinarity, conceptual simplicity and wide applicability to model real systems. Although fast growing, there is a number of problems which have not been addressed by using complex networks. For example, few efforts have been directed to systems involving coupling and interaction between different complex networks. In the following monography, we present two fundamental contributions in the study of such systems. The first consists in a model which describes the interaction dynamics between a mass pattern evolving in a regular network with a complex network, which are expected to control the pattern evolution. As soon as a complex network node is activated by the regular network, it requests help from its topological neighbours and activates them. The activation is triggered when the mass concentration overcomes a threshold in the node position and consists in liberating an opposite diffusion intended to eliminate the original pattern. The dynamics is completely related to the structure of the control network. The existence of hubs in the Barabási-Albert model plays a fundamental role to accelerate the opposite mass generation. Conversely, the uniform distribution of neighbours in the Erdös-Rényi network provided an increase in the efficiency when several focuses of the original pattern were distributed in the regular network. The second contribution consists in a model based on interactions between two species (predator and prey) provided by sensitive fields which depends of the Euclidean distance between two agents and on their respective types. Spatio-temporal patterns emerge in the system which are directly related to the attraction intensity between same species agents. To understand the dynamics evolution and quantify the information transfer through different clusters, we built two complex networks where the nodes represent the agents. In the first network, the edge weight is given by the Euclidean distance between two agents and, in the second network, by the amount of time two agents become close one another. By following a merging process, another network is obtained whose nodes correspond to spatial groups defined by a weight thresholding process in the first network. Some configurations favor the preys survival, while predators efficiency are improved by other ones.
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Paula, Demétrius Ribeiro de. "Dinâmica de redes neurais e formação de agregados em redes complexas." reponame:Repositório Institucional da UFC, 2006. http://www.repositorio.ufc.br/handle/riufc/9649.
Анотація:
PAULA, Demétrius Ribeiro de. Dinâmica de redes neurais e formação de agregados em redes complexas. 2006. 90 f. Dissertação (Mestrado em Física) - Programa de Pós-Graduação em Física, Departamento de Física, Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2006.Submitted by Edvander Pires (edvanderpires@gmail.com) on 2014-11-03T18:54:59Z No. of bitstreams: 1 2006_dis_drpaula.pdf: 978829 bytes, checksum: 6f46a6d334b9c066ec1350d74f8beb77 (MD5)
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The process by which news trends and ideas propagate in social communities can have a profound impact in the life of individuals. To understand thi process, we introduce a competitive cluster growth model in complex networks. In our model, each cluster represents the set of individuals with a certain opinion or preference. We investigate how the cluster size distribution depends on the topology of the network and how it is affected by the number of initial seeds dispersed in the structure. We study our model using different network models, namely, the Erdos-Renyi geometry, the preferential attachment model, and the so-called Apollonian network. This last complex geometry displays a cluster size distribution that follows a power-law with an exponent 1.0. Similar results have been obtained for the distributions of number of votes per candidate in the proportional elections for federal representation in Brazil. In the second part of this work, we investigate the temporal behavior of neural networks with small world topology and in networks built according to the preferential attachment model. In the first case we study the effect of the range of connections on the behavior of the time series. In both topologies, we detect the existence of cycles and investigate how their periods depend on the size of the system.
Este dissertação foi dividida em duas partes, na primeira parte nós propomos um modelo de crescimento competitivo de gregados em redes complexas para simular a propagação de idéias ou opiniões em comunidades. Investigamos como as distribuições de tamanhos de agregados variam com a topologia de construção da rede e com o número de sementes aleatoriamente dispersas na estrutura. Para tal, analisamos redes do tipo de Erdos-Rényi, redes de contato preferencial e a chamada rede Apoloniana. Esta última apresenta distribuições de tamanho de agregado em forma de uma lei de potência com um expoente aproximadamente 1. Resultados similares são observados com as distribuições obtidas para as frações de votos por candidato às eleições proporcionais para deputados no Brasil. Na segunda parte, analisamos o comportamento temporal da atividade neural em redes com características de mundo pequeno e em redes construídas segundo o modelo do contato preferencial. Nesta primeira topologia, estudamos como a série temporal se comporta com a variação do alcance das conexões. Em ambas as topologias, observamos a formação de períodos e investigamos como estes variam com o tamanho da rede.
26
Tahiri, Mohamed. "Phtalocyanines de fer(i) et de fer(0) : synthese, structure et reactivite." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13043.
Анотація:
Synthese et caracterisation d'une serie de complexes monoreduits de phtalocyanine de fer de type (fe pc r::(8))**(-) ou r=och::(3), ch::(3), h, cl et cn. On donne les structures par rx de composes monoanioniques et dianionique fe pc**(-) et fe pc**(2-). Proprietes chimiques de fe pc**(2-). De tels especes peuvent etre des modeles d'intermediaires formes dans la reaction de la phenylhydrazine sur la metmyoglobine ou dans le metabolisme de substrats suicides par cytochrome p450
27
Visweshwaran, Sai Prasanna. "The role of a trimeric coiled coil protein in WASH complex assembly." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS291/document.
Анотація:
Le complexe Arp2/3 génère des réseaux d’actine branchés, qui produisent une forcée de poussée permettant à la cellule de remodeler ses membranes. Le complexe WASH active le complexe Arp2/3 à la surface des endosomes et facilite ainsi la scission membranaire des intermédiaires de transports contenants des récepteurs internalisés tels que les intégrines α5β1. De ce fait, le complexe WASH en favorisant le recyclage des intégrines, joue un rôle crucial dans l’invasion des cellules tumorales durant la progression tumorale. Cependant, le mécanisme d’assemblage du complexe WASH est inconnu. Dans cette étude, nous rapportons l’identification du premier facteur d’assemblage du complexe WASH. Nous avons identifié la protéine HSBP1 grâce à un crible des protéines qui se lient aux formes précurseurs des sous-unités mais plus au complexe une fois assemblé. La reconstitution biochimique et la modélisation moléculaire nous a permis de montrer que HSBP1 est associé avec le précurseur trimérique CCDC53, le dissocie et forme un hétérotrimère qui va éventuellement libérer une forme monomérique de CCDC53 pour l’assemblage du complexe WASH. Le rôle de HSBP1 dans l’assemblage du complexe WASH est conservé. En effet, WASH est déstabilisé dans des cellules mammaires par le knock-down de HSBP1 et dans l’amibe Dictyostelium par le knock-out de HSBP1. La déstabilisation du complexe WASH par le knock-out de HSBP1 phénocopie la déplétion de WASH dans l’amibe Dictyostelium. Dans des cellules humaines de carcinomes mammaires l’inhibition de l’expression de HSBP1 altère le recyclage des intégrines à la membrane plasmidique. Il en résulte des adhésions focales défectueuses et des capacités invasives réduites. De plus, HSBP1 est localisé aux centrosomes et est requis pour la polarité des cellules lors de la migration. Enfin, nous avons trouvé que la surexpression de HSBP1 dans des tumeurs mammaires est associée à une augmentation des niveaux du complexe WASH et à un mauvais pronostic pour les patientes atteintes de cancer du sein. En conclusion, HSBP1 est un facteur d’assemblage conservé qui contrôle les niveaux du complexe WASHThe Arp2/3 complex generates branched actin networks, which produces a pushing force that helps the cell to remodel its membranes. The WASH complex activates the Arp2/3 complex at the surface of endosomes and thereby, facilitates the membrane scission of the transport intermediates containing internalized receptors such as α5β1 integrins. Hence, by promoting integrin recycling, the WASH complex plays a crucial role in tumor cell invasion during cancer progression. However, how cells assemble the WASH complex at first is unknown. Here we report the identification of the first assembly factor of the WASH complex. We identified HSBP1 in a proteomics screen for proteins binding to precursor forms of subunits, but not to the fully assembled WASH complex. Through biochemical reconstitution and molecular modeling, we found that HSBP1 associates with the precursor CCDC53 trimer, dissociates it and forms a heterotrimer that will eventually contribute a single CCDC53 molecule to the assembling WASH complex. The role of HSBP1 in WASH complex assembly is well conserved since WASH is similarly destabilized upon HSBP1 knock-down in mammalian cells or upon HSBP1 knock-out in Dictyostelium amoeba. In line with the defective assembly of the WASH complex, the HSBP1 knock-out closely phenocopies WASH knock-out in amoeba. In human mammary carcinoma cells, HSBP1 depletion results in impaired integrin recycling to the plasma membrane leading to the defective development of focal adhesions and reduced invasion abilities. Moreover, HSBP1 was found to localize at the centrosome and was required for the polarization associated with the migration. On the other end, in mammary breast tumors, we found that HSBP1 was often overexpressed and that its overexpression was associated with increased levels of the WASH complex and with poor prognosis for breast cancer patients. Hence, HSBP1 is a conserved assembly factor that controls the levels of the WASH complex
28
Kleineberg, Kaj Kolja. "Evolution and ecology of the digital world: A complex systems perspective." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/400404.
Анотація:
Online social networks (OSNs) enable researchers to study the social universe at a previously unattainable scale. The worldwide impact and the necessity to sustain their rapid growth emphasize the importance to unravel the laws governing their evolution. We present a quantitative two-parameter model which reproduces the entire topological evolution of a quasi-isolated OSN with unprecedented precision from the birth of the network. This allows us to precisely gauge the fundamental macroscopic and microscopic mechanisms involved. Our findings suggest that the coupling between the real pre-existing underlying social structure, a viral spreading mechanism, and mass media influence govern the evolution of OSNs. The empirical validation of our model, on a macroscopic scale, reveals that virality is four to five times stronger than mass media influence and, on a microscopic scale, individuals have a higher subscription probability if invited by weaker social contacts, in agreement with the "strength of weak ties" paradigm. The simultaneous existence of numerous digital services naturally raises the question under which conditions these services can coexist. In analogy to population dynamics, the digital world is forming a complex ecosystem of interacting networks whose fitnesses depend on their ability to attract and maintain users' attention, which constitutes a limited resource. We introduce an ecological theory of the digital world which exhibits a stable coexistence of several networks as well as the domination of a single one, in contrast to the principle of competitive exclusion. Interestingly, our model also predicts that the most probable outcome is the coexistence of a moderate number of services, in agreement with empirical observations. In addition, we discuss the impact of heterogeneity in network fitnesses induced by competition between an international network, such as Facebook, and local services. To this end, we construct a 1:1000 scale model of the digital world, consisting of the 80 countries with the most Internet users. We show how inter-country social ties induce increased fitness of the international network. Under certain conditions, this leads to the extinction of local networks; whereas under different conditions, local networks can persist and even dominate the international network completely. Finally, we investigate how multiple coexisting networks, which form a so called multiplex system, facilitate search and navigation with only local knowledge. This task is especially important in decentralized architectures. In particular, we show that multiplex systems are not random combinations of single network layers. Instead, they are organized in specific ways dictated by hidden geometric correlations between the individual layers. We find that these correlations are strong in different real multiplexes, and form a key framework for answering many important questions. Specifically, we show that these geometric correlations facilitate: (i) the definition and detection of multidimensional communities, which are sets of nodes that are simultaneously similar in multiple layers; (ii) accurate trans-layer link prediction, where connections in one layer can be predicted by observing the hidden geometric space of another layer; and (iii) efficient targeted navigation in the multilayer system using only local knowledge, which outperforms navigation in the single layers only if the geometric correlations are sufficiently strong. Interestingly, many real systems fulfill these conditions. To conclude, from a system-level perspective, a prospering future in the digital age comprised of a diverse digital landscape with interacting, decentralized architectures is possible, but so is the opposite. It remains a task for society to create sufficient awareness and the correct incentives to create this future we desire.Esta tesis está dedicada a los retos de un mundo interconectado que ha emergido a partir de la reciente revolución digital en el que servicios digitales se desarrollan y compiten en la ausencia de control central. Por tanto, herramientas, ideas y técnicas de análisis de sistemas complejos son útiles y especialmente adecuadas para describir la evolución y competencia entre redes sociales online. El éxito del Internet ha conectado individuos a escalas sin precedentes y la Web 2.0 promociona hoy en día colaboración global y el intercambio de ideas casi instantáneo. Sin embargo, la dominación de unos pocos poderosos monopolios de información representa un peligro para la libertad de ideas y decisiones de individuos. Por tanto, dos factores son esenciales para un futuro próspero en la era digital: diversidad digital y decentralización. En cuanto al primero, hemos introducido modelos basados en observaciones empíricas que permiten entender mejor la dinámica y las interacciones competitivas de las redes sociales online, los sistemas claves en el cosmos de la Web 2.0. En particular, nuestros descubrimientos revelan las condiciones en las cuales la diversidad digital se puede sostener. Con respecto al segundo, el diseño de arquitecturas descentralizadas contiene retos específicos, entre los que nos dirigimos especialmente a la búsqueda y navegación basada exclusivamente en conocimiento local. Hemos revelado en qué condiciones la existencia de muchas redes interaccionando facilita estas tareas. Afortunadamente, muchos sistemas reales cumplen estas condiciones. Para concluir, desde una perspectiva a nivel de sistema, un futuro próspero en el mundo digital compuesto por un paisaje digital diverso con arquitecturas descentralizadas en constante interacción es posible, pero no seguro. En esta situación, la conciencia, así como la creación de los incentivos adecuados, son retos importantes que nuestra sociedad debe afrontar. Crear conciencia suficiente e incentivos correctos para crear ese futuro sigue siendo un reto para la sociedad.
29
Paula, DemÃtrius Ribeiro de. "Dynamics of neural networks and cluster growth in complex networks." Universidade Federal do CearÃ, 2006. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=206.
Анотація:
Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgicoEste dissertaÃÃo foi dividida em duas partes, na primeira parte nÃs propomos um modelo de crescimento competitivo de gregados em redes complexas para simular a propagaÃÃo de idÃias ou opiniÃes em comunidades. Investigamos como as distribuiÃÃes de tamanhos de agregados variam com a topologia de construÃÃo da rede e com o nÃmero de sementes aleatoriamente dispersas na estrutura. Para tal, analisamos redes do tipo de Erdos-RÃnyi, redes de contato preferencial e a chamada rede Apoloniana. Esta Ãltima apresenta distribuiÃÃes de tamanho de agregado em forma de uma lei de potÃncia com um expoente aproximadamente 1. Resultados similares sÃo observados com as distribuiÃÃes obtidas para as fraÃÃes de votos por candidato Ãs eleiÃÃes proporcionais para deputados no Brasil. Na segunda parte, analisamos o comportamento temporal da atividade neural em redes com caracterÃsticas de mundo pequeno e em redes construÃdas segundo o modelo do contato preferencial. Nesta primeira topologia, estudamos como a sÃrie temporal se comporta com a variaÃÃo do alcance das conexÃes. Em ambas as topologias, observamos a formaÃÃo de perÃodos e investigamos como estes variam com o tamanho da rede.
The process by which news trends and ideas propagate in social communities can have a profound impact in the life of individuals. To understand thi process, we introduce a competitive cluster growth model in complex networks. In our model, each cluster represents the set of individuals with a certain opinion or preference. We investigate how the cluster size distribution depends on the topology of the network and how it is affected by the number of initial seeds dispersed in the structure. We study our model using different network models, namely, the Erdos-Renyi geometry, the preferential attachment model, and the so-called Apollonian network. This last complex geometry displays a cluster size distribution that follows a power-law with an exponent 1.0. Similar results have been obtained for the distributions of number of votes per candidate in the proportional elections for federal representation in Brazil. In the second part of this work, we investigate the temporal behavior of neural networks with small world topology and in networks built according to the preferential attachment model. In the first case we study the effect of the range of connections on the behavior of the time series. In both topologies, we detect the existence of cycles and investigate how their periods depend on the size of the system.
30
Roberts, James Scott. "Suspended complex." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/45217.
Анотація:
In simple terms, you could say that building order is the unity that arises in a building when the parts taken together determine the whole and, conversely, when the separate parts derive from the whole in an equally logical way. The unity resulting from design that consistently employs this reciprocity may in a sense be regarded as a structure.Master of Architecture
31
GU, JIN. "Game Complex." Thesis, KTH, Arkitektur, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277849.
Анотація:
This project is a new type of game center in the "game paradise" Akihabara, Tokyo. In Japan, anime, cosplay, Game industry and virtual world have developed very mature and attractive, while in the reality society, most people are under great pressure. Those lead to the Otaku culture, refer to people like to stay at home, obsessed with virtual world and avoid the real social activities. Game and game center tend to become negative things in many ways. So in this project I want to add new fun circulations in the building, and create new games which help people have better interaction with spaces, to encourage those "negative""lazy" gamer to go out to look around the real world.
32
Li, Ji. "Ribbon Complex." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/46331.
Анотація:
This thesis is a series of experiments performed on how ribbon-like bands of material can be folded to generate special volumes that can accommodate the functional aspects of a building program.Master of Architecture
33
Dublin, Marina. "Complex Simplicity." VCU Scholars Compass, 2013. http://scholarscompass.vcu.edu/etd/2962.
Анотація:
I was born the only American in my West Indian, Guyanese family. My culture played a large part in how I was brought up, and in turn, shaped the person and artist I have become. In my work, I like for my viewers to get a personal feel for what it is like to be West Indian American. My work is a cultural record of people, places, and things. I capture small, special moments because I know that they will never be recreated. My camera’s viewfinder has always been filtered through my eye as a child of immigrant parents. I use photography as my first step in creating and recording ordinary, everyday things. Photographs are captured where I feel most American eyes would by-pass or overlook their importance. However, my work must also involve my hand. Therefore, through my mark making, whether I am drawing, painting, collaging, stitching or using software, I add and subtract from my original photos. By manipulating my images, I change and emphasize a single, fleeting moment into something permanent and significant.
34
Henderson, Michael E. Keller Herbert Bishop Keller Herbert Bishop. "Complex bifurcation /." Diss., Pasadena, Calif. : California Institute of Technology, 1985. http://resolver.caltech.edu/CaltechETD:etd-03262008-112516.
35
Henry, Marc. "Application du concept d'electronegativite aux processus d'hydrolyse et de condensation en chimie minerale." Paris 6, 1988. http://www.theses.fr/1988PA066293.
Анотація:
Utilisation des procedes sol-gel pour elabour des materiaux a base d'oxydes et a proprietes optimisees. Mecanismes d'hydrolyse et de condensation des precurseurs moleculaires (alcoxydes ou sels metalliques) aboutissant a l'obtention de materiaux mixtes organiques/inorganiques
36
Deforzh, Evgeny. "Le complexe IMP3 protège ses ARNm cibles de la répression traductionnelle dépendante de Argonaute/GW182/miRNA." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS203/document.
Анотація:
Les protéines se liant à l’ARN de la famille IMP sont les protéines oncofoetales conservées, qui régulent le transport, la stabilité et la traduction de plusieurs ARNm cibles. Les IMPs sont impliqués dans la tumorigenèse et dans le développement embryonnaire par le contrôle de la prolifération cellulaire, la différenciation, la migration, la polarisation et d`autres processus cellulaires. IMP-3 est difficilement détectable dans des tissus adultes normaux, mais il est surexprimé dans les nombreux cancers, où il a été caractérisé comme un marqueur d’agressivité et de la croissance tumorale rapide, ainsi que d’un pronostic défavorable pour les patients. Dans notre étude, nous avons utilisé une lignée cellulaire RD de rhabdomyosarcome (RMS), où IMPs étaient initialement décrits comme des protéines régulatrices de l`ARNm de IGF-2. Nous avons essayé d'élucider le mécanisme par lequel IMP3 régule l’expression des cyclines D1 et D3, contribuant ainsi à la compréhension des processus oncogéniques dans les RMS et autres cancers.Nous avons montré que IMP3 régule l'expression des cyclines D1 et D3 d'une manière significative in vivo. Nous avons également démontré, qu'en absence de IMP3, les ARNm des cyclines sont exportés vers le cytoplasme et s’associent avec les polyribosomes, mais ne sont pas traduits. En outre, l'inhibition d`IMP3 n'a pas d'influence sur la stabilité des ARNm des cyclines. Nous démontrons que dans des cellules cancéreuses humaines, IMP3 interagit avec plusieurs protéines se liant à l'ARN, et que nombre de ces protéines a un effet sul l’expression des cyclines, ce que suggère l'existence d'un complexe régulateur multiprotéique sur les 3'UTR des cyclines D1 et D3. Nos résultat montrent que l'inhibition de deux protéines clés de RNA-induced silencing complex (RISC) (AGO2 et GW182/TNRC6), rétablit les niveaux d'expression des cyclines D1 et D3, qui ont été considérablement diminués en l’absence d’IMP3 ou de ses partenaires protéiques ILF3/NF90 et PTBP1. Nous concluons que les complexes d`IMP3 et RISC peuvent concourir pour la régulation des ARNm des cyclines. Nous avons également identifié les miARNs qui peuvent être impliqués dans ce processus, ainsi que les domaines fonctionnellement importants dans les 3 'UTR des cyclines, où se passe la competition entre les complexes d’IMP-3 et RISC. Nos résultats sont compatibles avec l'existence de IMP3 - contenant complexe multiprotéique, qui est associé à 3'UTRs des cyclines et régule leur traduction en les protégeant contre la répression traductionnelle par miRISCRNA-binding proteins of the IMP family (IGF2 mRNA-binding proteins 1-3) are conserved oncofetal proteins, regulating transport, stability and decay of multiple mRNAs. IMPs are involved in embryonic developement and tumorigenesis by controlling cell proliferation, differentation, migration, polarization and many other important aspects of cell function. IMP-3 is hardly detectable in normal adult tissues, but is overexpressed in many cancers, where it has been reported as a marker of tumor aggressiveness, rapid growth, and bad prognosis for patients. In our research we utilized a rhabdomyosarcoma (RMS) cell line RD, where IMPs were first described as IGF-2 mRNA regulating proteins. We aimed to elucidate the mechanism by which IMP3 regulates the expression of cyclins D1 and D3, thereby contributing to the understanding of oncogenic processes in RMS.In this study, we show that IMP3 regulates the expression of cyclin D1 and D3 in a significant manner in vivo. We also demonstrate that in the absence of IMP3, the mRNAs of the cyclins are exported to the cytoplasm and associated with polyribosomes, but not translated. IMP3 inhibition does not influence the stability of cyclin mRNAs. We demonstrate that in human cancer cells, IMP3 interacts with multiple RNA-binding proteins, and that a number of these IMP-3 partners impacts on the expression of cyclins D1 and D3. These observations suggest the existence of a regulatory IMP-3 containing RNP complex on the 3’UTR of mRNAs of cyclin D1 and D3. Our results show that an inhibition of two key proteins of RNA-induced silencing complex (RISC) (AGO2 and GW182/TNRC6) rescues the expression of cyclin D1 and D3 proteins, which is significantly decreased in the absence of IMP3 or its protein partners ILF3/NF90 and PTBP1. Therefore, IMP3 and RISC complexes can compete for cyclin mRNAs translational repression/activation. We also identified a number of miRNAs that can be involved in this process, and characterized functionally important regions within 3’ UTRs of the cyclins, where the competition between IMP-3 and RISC complexes takes place. Our results are consistent with the existence of IMP3 - containing multiprotein complex, which is associated with 3’UTRs of the cyclins and regulates their translation by protecting them from miRISC-dependent translational repression
37
Gomes, de Lima Bernardes Miriam. "Réactivité de complexes organométalliques mono- et dinucléaires : synthèse de thiolato-composés du molybdène, du tungstène et du cobalt : étude de la formation de liaisons c-c dans la sphère de coordination du métal." Brest, 1986. http://www.theses.fr/1986BRES2008.
Анотація:
Caracterisation des complexes ((c::(5)h::(5))(co)::(2) lwc(cf::(3)) = c(cf::(3))h) et (c::(5)h::(5))(co) lwc(o)c(cf::(3)) = c(cf::(3))h) (l=co,pr::(3),p(or)::(3)) synthese de complexes dinucleaires de mo et w. L'addition oxydante de dialkylsulfure a des derives biportes de mo(ii) et w(ii) a donne lieu a la formation de complexes thiolato triportes ((c::(5)h::(5))(co)m(mu -sr)::(3)m(co)(c::(5)h::(5)))tx**(-)
38
Reis, Elohim Fonseca dos 1984. "Criticality in neural networks = Criticalidade em redes neurais." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/276917.
Анотація:
Orientadores: José Antônio Brum, Marcus Aloizio Martinez de AguiarDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin
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Resumo: Este trabalho é dividido em duas partes. Na primeira parte, uma rede de correlação é construída baseada em um modelo de Ising em diferentes temperaturas, crítica, subcrítica e supercrítica, usando um algorítimo de Metropolis Monte-Carlo com dinâmica de \textit{single-spin-flip}. Este modelo teórico é comparado com uma rede do cérebro construída a partir de correlações das séries temporais do sinal BOLD de fMRI de regiões do cérebro. Medidas de rede, como coeficiente de aglomeração, mínimo caminho médio e distribuição de grau são analisadas. As mesmas medidas de rede são calculadas para a rede obtida pelas correlações das séries temporais dos spins no modelo de Ising. Os resultados da rede cerebral são melhor explicados pelo modelo teórico na temperatura crítica, sugerindo aspectos de criticalidade na dinâmica cerebral. Na segunda parte, é estudada a dinâmica temporal da atividade de um população neural, ou seja, a atividade de células ganglionares da retina gravadas em uma matriz de multi-eletrodos. Vários estudos têm focado em descrever a atividade de redes neurais usando modelos de Ising com desordem, não dando atenção à estrutura dinâmica. Tratando o tempo como uma dimensão extra do sistema, a dinâmica temporal da atividade da população neural é modelada. O princípio de máxima entropia é usado para construir um modelo de Ising com interação entre pares das atividades de diferentes neurônios em tempos diferentes. O ajuste do modelo é feito com uma combinação de amostragem de Monte-Carlo e método do gradiente descendente. O sistema é caracterizado pelos parâmetros aprendidos, questões como balanço detalhado e reversibilidade temporal são analisadas e variáveis termodinâmicas, como o calor específico, podem ser calculadas para estudar aspectos de criticalidade
Abstract: This work is divided in two parts. In the first part, a correlation network is build based on an Ising model at different temperatures, critical, subcritical and supercritical, using a Metropolis Monte-Carlo algorithm with single-spin-flip dynamics. This theoretical model is compared with a brain network built from the correlations of BOLD fMRI temporal series of brain regions activity. Network measures, such as clustering coefficient, average shortest path length and degree distributions are analysed. The same network measures are calculated to the network obtained from the time series correlations of the spins in the Ising model. The results from the brain network are better explained by the theoretical model at the critical temperature, suggesting critical aspects in the brain dynamics. In the second part, the temporal dynamics of the activity of a neuron population, that is, the activity of retinal ganglion cells recorded in a multi-electrode array was studied. Many studies have focused on describing the activity of neural networks using disordered Ising models, with no regard to the dynamic nature. Treating time as an extra dimension of the system, the temporal dynamics of the activity of the neuron population is modeled. The maximum entropy principle approach is used to build an Ising model with pairwise interactions between the activities of different neurons at different times. Model fitting is performed by a combination of Metropolis Monte Carlo sampling with gradient descent methods. The system is characterized by the learned parameters, questions like detailed balance and time reversibility are analysed and thermodynamic variables, such as specific heat, can be calculated to study critical aspects
Mestrado
Física
Mestre em Física
2013/25361-6
FAPESP
39
Brown, James Ryan. "Complex and almost-complex structures on six dimensional manifolds." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4466.
Анотація:
Thesis (Ph.D.)--University of Missouri-Columbia, 2006.The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (February 26, 2007) Vita. Includes bibliographical references.
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Duvefelt, Sabine, and Carolina Sjölander. "Multiple Discrimination : Addressing Complex Discrimination in a Complex Society." Thesis, Örebro University, Department of Behavioural, Social and Legal Sciences, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-1912.
Анотація:
Abstract
This thesis show how the European Community, through legislation and case law, is addressing the problem of multiple discrimination and what the possible solutions to it are.
Multiple discrimination describes a situation where an individual experiences discrimination on more than one ground. This can occur in two different ways; additive or intersectional. Additive discrimination describes a situation where an individual is discriminated against on more than one ground and these grounds are added on top of each other. Intersectional discrimination explains how an individual’s multiple identities may be the cause of discrimination in such a way that the grounds for discrimination cannot be considered separately.
Expanding the list of grounds in Article 13 EC could help multiple discrimination claims but cannot be seen as the exclusive solution to such a complex problem. Many more problems surround multiple discrimination claims. One is to find an adequate comparator in order to prove discrimination. Another is that the case law shows a higher rate of success for plaintiffs claiming only one ground of discrimination even if they have experienced multiple discrimination, causing a disparity between the facts of the case and the reality experienced by the plaintiffs.
In conclusion, such a complex matter cannot be solved by one simple solution but the Community would benefit from an explicit prohibition as well as a common definition of multiple discrimination.
41
Kandaiah, Nishani. "Flow splitting of rheologically complex fluids under complex conditions." Thesis, Imperial College London, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.412537.
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Azevedo, Laura Rosa Kugler de [UNESP]. "Informação, ação e relações colaborativas: uma perspectiva filosófica da complexidade." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/145531.
Анотація:
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
A presente dissertação intitulada “Informação, ação e relações colaborativas: uma perspectiva filosófica da complexidade” tem por objetivo realizar um estudo de hipóteses do paradigma da complexidade envolvendo a comunicação entre seres humanos. O problema central que direciona a presente reflexão pode ser assim enunciado: Qual é o papel dos padrões informacionais na ação colaborativa dos seres humanos, concebidos como sistemas complexos? Esse problema será inicialmente analisado a partir da hipótese elaborada por Bateson, segundo a qual relações de dependência se estabelecem entre seres vivos, criando vínculos específicos e dinâmicos entre eles quando há reciprocidade em suas relações. Recorremos também às hipóteses formuladas por Weaver em 1948 sobre a natureza de problemas característicos do domínio da complexidade. O presente trabalho está organizado em três capítulos. No primeiro, investigamos aspectos da Teoria dos Sistemas Complexos que nos auxiliam a analisar o conceito de Informação, com ênfase na noção de Padrões Informacionais. No capítulo 2, investigamos a Virada Naturalista na filosofia e a importância da experiência para a filosofia, que passou a ganhar espaço com essa Virada, proporcionada pela revolução iniciada por Darwin na biologia. As noções de Padrões Informacionais e de Duplo-Vínculo são apresentadas no capítulo 2, que tem como ponto fundamental o estudo da relação comunicativa entre seres vivos. No capítulo 3, analisamos hipóteses de teorias que explicitam relações de amizade, presenciais e virtuais, entre pessoas, focalizando o estudo de relações colaborativas propiciadas pelo estabelecimento de padrões informacionais.
This dissertation, entitled “Information, action and collaborative relationships: a philosophical perspective of complexity” aims to conduct a study of hypotheses of the complexity paradigm involving communication between humans. The central problem that directs this reflection can be so stated: What is the role of informational patterns in the collaborative action of human beings, conceived as complex systems? This problem will be initially analyzed from the hypothesis elaborated by Bateson, according to which dependency relationships are established between living beings, creating specific and dynamic links between them when there is reciprocity in their relationships. We also investigate the assumptions made by Weaver in 1948 about the nature of problems dealing with complexity. This dissertation is organized into three chapters. In the first one, we investigated aspects of the Theory of Complex Systems that help us to analyze the concept of Information, emphasizing the notion of Informational Patterns. In chapter 2, we investigate the Naturalistic Turn in philosophy and the importance of experience to philosophy, which went on to gain space with this Turn, provided by the revolution initiated by Darwin in biology. The notions of Informational Patterns and Double-Bind are presented in the chapter 2 that presents the result of a study of the communicative relationship between living beings. In chapter 3, we analyze assumptions of theories that explain relations of friendship and virtual friendship between people, focusing on the study of collaborative relationships offered by the establishment of informational patterns.
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Mammass, Driss. "Sur le theoreme de polya-carlson concernant les series de puissances a coefficients entiers dans c**(n)." Toulouse 3, 1988. http://www.theses.fr/1988TOU30097.
Анотація:
L'objet de ce travail est un theoreme classique de polya-carlson sur la rationalite des series de puissances a coefficients entiers. Dans le premier chapitre, on donne une demonstration detaillee pour ce theoreme de polya dans le cas d'une famille normale de fonctions analytiques sur ck, avvec k un compact de c. Dans le second chapitre, on donne ce meme resultat pour une famille normale de fonctions analytiques sur ck::(1) x ck::(2) x. . . X ck::(n) ou k::(i), 1<-i<-n est un compact de c. Dans le dernier chapitre, on donne un critere de rationalite pour les series de puissances dans c**(n) qui est l'analogue de celui de kronecker en une variable. On donne aussi une estimation du type de celles de polya et zakharjuta pour les fonctions analytiques sur ck::(1) x. . . X ck::(n) avec k::(i), 1<-i<-n un compact de c. Cette estimation et le critere de rationalite nous permettent de donner une preuve directe du theoreme de martineau
44
Bennegueouche, Souad. "Invariance de certaines inegalites polynomicales harmoniques par rapport aux applications holomorphes." Toulouse 3, 1989. http://www.theses.fr/1989TOU30013.
Анотація:
Apres avoir rappele quelques definitions et resultats sur la l-regularite et la condition polynomiale de leja, nous etudions leurs analogues par des polynomes harmoniques, notees (h::(s)) et (h::(o)). Nous donnons des exemples de compacts verifiant ces deux conditions et generalisons certains resultats du cas holomorphe au cas harmonique. Enfin, comme contribution principale, nous donnons des resultats sur l'invariance de (h::(s)) et (h::(o)) par rapport aux applications holomorphes
45
Gutierrez, Guillen Gabriela. "Qualitative study of physical phenomena through geometry of complex foliations." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2024. http://www.theses.fr/2024UBFCK012.
Анотація:
Cette thèse aborde deux sujets en physique mathématique : l'effet de la raquette de tennis et la monodromie hamiltonienne.Grâce à une exploration approfondie de la géométrie sous-jacente, nous fournissons une description mathématique complète de l'effet de la raquette de tennis, un phénomène géométrique observé dans les rotations libres de corps rigides. Nous examinons l'existence, l'origine et la robustesse de cet effet en utilisant la géométrie complexe et la géométrie réelle. Nous détectons également des signatures de contraintes physiques sur les moments d'inertie du corps, dans la structure géométrique de l'effet de la raquette de tennis. L'analyse est étendue à des phénomènes étroitement liés tels que l'effet Dhzanibekov, le monster flip et la phase de Montgomery.La deuxième partie de la thèse se concentre sur la monodromie Hamiltonienne, qui est l'obstruction topologique la plus simple à l'existence de coordonnées d'action-angles globales pour un système complètement intégrable. Nous montrons que l'utilisation de paires de Lax spectrales fournit une structure géométrique complexe qui permet l'étude de la monodromie Hamiltonienne et le calcul de la matrice de monodromie correspondante.Tout au long de ce travail de recherche, nous adoptons un cadre général qui utilise des feuilletages complexes pour fournir une structure géométrique aux problèmes posés, ce qui permet de mieux comprendre les phénomènes physiques correspondantThrough an in-depth exploration of the underlying geometry, we provide a full mathematical description of the tennis racket effect, which is a geometric phenomenon observed in free rotational dynamics of rigid bodies. We examine the existence, origin, and robustness of this effect using the interplay between complex and real geometries. We also detect signatures of physical constraints on the moments of inertia of the body, in the geometric structure of the tennis racket effect. The analysis is extended to closely related phenomena such as the Dhzanibekov effect, the monster flip, and the Montgomery phase.The second part of the thesis focuses on Hamiltonian monodromy, which is the simplest topological obstruction to the existence of global action-angle coordinates for a completely integrable system. We show that the use of spectral Lax pairs provides a complex geometric structure that enables the study of Hamiltonian monodromy and the calculation of the corresponding monodromy matrix.Throughout this research work, we adopt a general framework that employs complex foliations to provide a geometric structure for the problems under study, leading to a deeper understanding of these phenomena
46
Santos, Marcus Vinicio de Jesus. "Transformação de Möbius." Universidade Federal de Sergipe, 2016. https://ri.ufs.br/handle/riufs/6499.
Анотація:
The aim of this work is the study of arbitrary mobius transformations by means of simple
complex transformations, namely: the Translation, the Rotation, the Homotetia (Contraction
and Dilatation) and Inversion. The results obtained were applied in circles and straight line. At
the end, we give the the alternative of studying mobius transformations via matrices.O objetivo deste trabalho é estudar transformações de Möbius arbitrárias por meio de transformações complexas mais simples, a saber: a Translação, a Rotação, a Homotetia (Contração e Dilatação) e a Inversão. Os resultados obtidos foram aplicados em círculos e retas. No final, damos a alternativa de estudar transformações de Möbius via matrizes.
47
EL, AMOURI HANZ. "Synthese et reactivite catalytique de composes homo- et heterobinucleaires." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13156.
Анотація:
Utilisation du ligand tripode ch(pph::(2))::(3) pour synthetiser des complexes mononucleaires (rh(i), ir(i) et mo(0)), homobinucleaires (rh(i)-rh(i)), heterobinuclaires (rh(i)-cu(i), rh(i)-au(i), ir(i)-au(i) et polynucleaires (rh(i)::(4), rh(i)-cu(i)::(2)). Etude des proprietes catalytiques en hydrogenation des olefines et acetylene
48
Zhu, C. Z. "Some results in complex approximation with sequences of complex exponents." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ39903.pdf.
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Zhang, Xiangwen. "Complex Monge-Ampere equation and its applications in complex geometry." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=107800.
Анотація:
The main threads of this thesis are related by the theme of the complex Monge-Ampère type equations. It consists of some analysis results from the partial differential equation aspect and several geometric consequences as applications.In the first part, we study the a priori estimates for complex Hessian type equations on Hermitian manifolds. These estimates are the key ingredients for the solvability of the corresponding equations by virtue of the continuity method. In particular, we establish the first and second order derivative estimates for complex Monge-Ampère equations which are analogous to Yau's estimates on Kãhler manifolds. In Chapter 3, we investigate the interior Schauder estimates of the solutions to complex Monge-Ampère equations. Moreover, aiming to extend such regularity results to more general geometric setting, we also establish the classical Bedford-Taylor's interior second order estimate and a local version of Calabi's third order estimate on Hermitian manifolds. The last two chapters of this thesis are devoted to the geometric problems related to complex Monge-Ampère type equations. In particular, we give some results on the nonnegative representation for the boundary class of Kãhler cone and the existence of generalized Kãhler-Einstein metrics.Dans cette thèse, il est question de l'étude des équations de type Monge-Ampère complexes. On y présente une analyse basée sur les différentes techniques utilisées dans la théorie des équations aux dérivées partielles ainsi que certaines applications géométriques. En premier lieu, nous présentons l'estimation à priori des équations de type Hessienne complexes sur des variétés hermitiennes. Ces estimations sont indispensables à la résolution de ces équations par le biais des méthodes de continuité. Au fait, nous établirons des estimations sur la première et la seconde dérivée des équations Monge-Ampère complexes de la même manière faite par Yau sur les variétés kählériennes.Au troisième chapitre, nous étudions la régularité de Hölder intérieure des dérivées secondes de la solution pour les équations de type Monge-Ampère complexes. De plus, en visant la généralisation de ce type de résultats de régularité à des géométries plus généralee, on a obtenu une estimation de deuxième ordre de type Bedford-Taylor classique et une version locale des estimations de Calabi de troisième ordre sur des variétés hermitiennes. Les deux derniers chapitres de cette thèse sont consacrés aux problèmes géométriques reliés aux équations de type Monge-Ampère complexes. Nous donnons quelques résultats sur la représentation non négative pour la classe de frontière du cône de Kähler et l'existence des métriques généralisée Kähler-Einstein.
50
James, Eric. "The NGO-Military Complex and the Complex Emergency in Afghanistan." Thesis, University of Manchester, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.509051.