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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Dinâmica de polímeros do tipo redes de mundo pequeno

Oliveira, Edieliton Silva de 02 February 2015 (has links)
Submitted by Kamila Costa (kamilavasconceloscosta@gmail.com) on 2015-06-19T19:52:34Z No. of bitstreams: 1 Dissertacao-Edieliton S de Oliveira.pdf: 2119504 bytes, checksum: 912c6106c141d1b2adee157fb7e4997b (MD5) / Approved for entry into archive by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2015-07-06T19:31:13Z (GMT) No. of bitstreams: 1 Dissertacao-Edieliton S de Oliveira.pdf: 2119504 bytes, checksum: 912c6106c141d1b2adee157fb7e4997b (MD5) / Approved for entry into archive by Divisão de Documentação/BC Biblioteca Central (ddbc@ufam.edu.br) on 2015-07-06T19:35:15Z (GMT) No. of bitstreams: 1 Dissertacao-Edieliton S de Oliveira.pdf: 2119504 bytes, checksum: 912c6106c141d1b2adee157fb7e4997b (MD5) / Made available in DSpace on 2015-07-06T19:35:15Z (GMT). No. of bitstreams: 1 Dissertacao-Edieliton S de Oliveira.pdf: 2119504 bytes, checksum: 912c6106c141d1b2adee157fb7e4997b (MD5) Previous issue date: 2015-02-02 / CNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico / The main objective of this work is the theoretical study of the dynamics of flexible polymers having a small world topology using the Rouse model [1]. The first specific objective is to determine the general solution of the Langevin equation [2] and use it for our model. The second specific objective is the construction of new treelike small-world networks, using programming techniques (Fortran). Another objective is the numerical determination of the eigenvalues of the connectivity matrix for small-world networks, which will solve the dynamics. Knowing the eigenvalues’ spectrum we calculate the average polymer displacement and the complex modulus. / O objetivo geral deste trabalho é o estudo teórico da dinâmica de polímeros flexíveis com topologia de mundo pequeno através do modelo de Rouse[1]. O primeiro objetivo específico é determinar a solução geral da equação de Langevin[2] e aplicá-la para nosso modelo. O segundo objetivo específico é a construção de novas redes de mundo pequeno de tipo árvore, usando as técnicas de programação (Fortran). Outro objetivo é a determinação numérica dos autovalores da matriz de conectividade para as redes de mundo pequeno, que resolverá a dinâmica. Conhecendo o espectro dos autovalores calcularemos o deslocamento médio dos polímeros e o módulo complexo.
2

F?sica estat?stica aplicada a sistemas sociais atrav?s do estudo de redes complexas

Duarte, Gerdivane Ferreira 21 February 2014 (has links)
Made available in DSpace on 2015-03-03T15:15:30Z (GMT). No. of bitstreams: 1 GerdivaneFD_DISSERT.pdf: 2461999 bytes, checksum: afd653d46e87e83d8b0144e8086a3d19 (MD5) Previous issue date: 2014-02-21 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / In this work a study of social networks based on analysis of family names is presented. A basic approach to the mathematical formalism of graphs is developed and then main theoretical models for complex networks are presented aiming to support the analysis of surnames networks models. These, in turn, are worked so as to be drawn leading quantities, such as aggregation coefficient, minimum average path length and connectivity distribution. Based on these quantities, it can be stated that surnames networks are an example of complex network, showing important features such as preferential attachment and small-world character / Neste trabalho ? apresentado um estudo das redes sociais baseado na an?lise dos nomes de fam?lias. Faz-se uma abordagem b?sica do formalismo matem?tico dos grafos e em seguida apresenta-se os principais modelos te?ricos para as Redes Complexas com o objetivo de fundamentar a an?lise das redes dos sobrenomes. Estas, por sua vez, s?o trabalhadas de modo a serem extra?das as principais grandezas, tais como coe ciente de agrega??o, menor caminho m?dio e distribui??o de conectividades. Com base nestas grandezas, pode-se a rmar que as redes de sobrenomes s?o um exemplo de rede complexa, exibindo caracter?sticas importantes como liga??o preferencial e o car?ter de mundo pequeno.

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