Estudio de los aniones y el efecto Hall cuántico

87 hojas, ilustradas.Se estudian las características más importantes del efecto Hall cuántico entero y fraccionario, además, se analiza en detalle los conceptos fundamentales de la teoría de Aniones. En particular se muestra que el efecto Hall cuántico es un sistema bidimensional incompresible, cuya resistencia Hall es cuantizada en números enteros y fraccionales. Para el efecto Hall cuántico se ilustra el transporte electrónico en un sistema de dos dimensiones, con el objetivo de mostrar las nuevas propiedades encontradas en este efecto. Para la teoría de Aniones, se estudian las diferencias dinámicas y estadísticas entre sistemas de dos y tres dimensiones. Finalmente se muestra que los Aniones describen los estados excitados y los diferentes factores de llenado en el efecto Hall cuántico fraccionario.PregradoLicenciado en Físic

Análise da Câmara dos Deputados do Brasil usando a perspectiva da teoria de redes

Orientador: Carlos Lenz CésarDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Física Gleb WataghinResumo: Apresenta-se um novo método efetivo para analisar um sistema de Deputados usando o formalismo da teoria de redes. Construiu-se uma matriz com os resultados anuais da votação nominal da Câmara dos Deputados do Brasil desde 2007 até 2015. Através da medida do coeficiente de correlação entre os conjuntos anuais de votação nominal, calculou-se uma rede de Deputados. Encontrando a Árvore Geradora Mínima da rede de Deputados características generais do sistema podem visualiza-se. Especificamente, expõe-se a postura de concordância - oposição, as conexões individuais entre os Deputados, a fidelidade partidária e uma nova maneira de observar os projetos de lei aprovados ou rejeitados, assim como sua evolução no tempo. Devido ao bom comportamento de correlação observado entre os Deputados, prova-se que cinco ou seis partidos políticos são suficientes para capturar toda a diversidade política existente na Câmara dos Deputados do Brasil. Além disso, propõe-se que a distribuição de probabilidade dos valores de correlação da Câmara dos Deputados do Brasil é uma combinação de distribuições logísticas. Enuncia-se também, um novo método de ordenar matrizes de correlação baseado no resultado da Árvore Geradora MínimaAbstract: A new effective method for analysing a Representatives¿ system from the network formalism is presented. A matrix with the annual results of roll - call vote of the Brazilian House of Representatives from 2007 to 2015 was constructed. By measuring the correlation coefficient between each pair of annual roll - call vote sets a Representatives¿ network was computed. For extracting the Minimal Spanning Tree of the Representatives' network general features of this system arises. Specifically, the concordance - opposition stance, the individual connections among Representatives, the partisan fidelity and a new way to identify the approved and disapproved draft bills, as well as, its time evolution are disclosed. A well-define correlation behaviour among Representatives is observed, in fact, we prove that five or six political parties are sufficient to encapsulate all political diversity in the Brazilian House of Representatives. In addition, we propose that the probability distribution of correlation values in the Brazilian House of Representatives is a combination of logistic distributions. Besides that, a new method for re-ordering correlation matrices based on the result of the Minimal Spanning Tree is enunciatedMestradoFísicaMestre em Física1490097/2015CAPE

Time evolution of the behaviour of Brazilian legislative Representatives using a complex network approach

The follow up of Representative behavior after elections is imperative for a democratic Representative system, at the very least to punish betrayal with no re-election. Our goal was to show how to follow Representatives' and how to show behavior in real situations and observe trends in political crises including the onset of game changing political instabilities. We used correlation and correlation distance matrices of Brazilian Representative votes during four presidential terms. Re-ordering these matrices with Minimal Spanning Trees displays the dynamical formation of clusters for the sixteen year period, which includes one Presidential impeachment. The reordered matrices, colored by correlation strength and by the parties clearly show the origin of observed clusters and their evolution over time. When large clusters provide government support cluster breaks, political instability arises, which could lead to an impeachment, a trend we observed three years before the Brazilian President was impeached. We believe this method could be applied to foresee other political storms.Comment: 11 pages, 4 Figure

Exploring collagen parameters in pure special types of invasive breast cancer

One of the promising tools to evaluate collagen in the extracellular matrix is the second-harmonic generation microscopy (SHG). This approach may shed light on the biological behavior of cancers and their taxonomy, but has not yet been applied to characterize collagen fibers in cases diagnosed as invasive breast carcinoma (BC) of histological special types (IBC-ST). Tissue sections from 99 patients with IBC-ST and 21 of invasive breast carcinoma of no special type (IBC-NST) were submitted to evaluation of collagen parameters by SHG. Tissue microarray was performed to evaluate immunohistochemical-based molecular subtype. In intratumoral areas, fSHG and bSHG (forward-SHG and backward-SHG) collagen parameters achieved their lowest values in mucinous, papillary and medullary carcinomas, whereas the highest values were found in classic invasive lobular and tubular carcinomas. Unsupervised hierarchical cluster analysis and minimal spanning tree using intratumoral collagen parameters allowed the identification of three main groups of breast cancer: group A (classic invasive lobular and tubular carcinomas); group B (IBC-NST, metaplastic, invasive apocrine and micropapillary carcinomas); and group C (medullary, mucinous and papillary carcinomas). Our findings provide further characterization of the tumor microenvironment of IBC-ST. This understanding may add information to build more consistent tumor categorization and to refine prognostication9CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP573913/2008-0; 312049/2014-508/57906-3; 11/51959-