965 resultados para Geometria hiperbolica


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Pós-graduação em Educação Matemática - IGCE

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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In contrast to what happened in the past where it was possible to select which species had a lower degree of variation, it is now necessary to use fast-growing species with efficient processing. For that we use the wood of Eucalyptus sp and studies related to the machining processes and their parameters such as wear of cutting tools and roughness. The present work aims to analyze the influence of geometry of cutting tools of high speed steel and the influence of the diameter of the final pieces in the process of turning wood of Eucalyptus sp in relation to power consumption, roughness, temperature machining, chip formed and wear of cutting tools. It was observed that the smaller the diameter of the end parts and greater wear of the tools, the worse quality of the machined surfaces and the greater the power consumed in the process of machining

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This work analyzed the loss of sensible heat from one fluid to be considered homogeneous heat distribution on a thermal reservoir with cylindrical geometries composite insulating layers. We studied two thermal reservoirs with a volume of 20 liters, and the first has a layer thickness of 75 mm of expanding polyurethane foam wrapped in the polycarbonate container and the second container has only layer thickness of 5 mm of polycarbonate, as insulation of fluid of the external environment. The experimental results are compared with theoretical results obtained through a calculation script, displayed and detailed during the work development, from the theory of energy balance. The maximum error introduced between the theoretical and experimental results were 3.5% and 1.4% respectively for the Boilers with or without a polyurethane coating

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Construction techniques with ruler and the compasses, fundamental on Euclidean geometry, have been related to modern algebraic theories such as solving equations and extension of bodies from the works by Paolo Ruffini (1765-1822), Niels Henrik Abel (1802-1829) and Evariste Galois (1811-1832). This relation could provide an answer to some famous problems, from ancient Greece, such as doubling the cube, the trisection Angle, the Quadrature of the Circle and the construction of regular polygons, which remained unsolved for over two thousand years. Also important for our purposes are the notions of algebraic numbers, transcendental and the criteria for constructability, of those numbers. The objective of this study is to reconstruct relevant steps of geometric constructions with ruler (unmarked) and the compasses, from the elementary to the outcome buildings, in the nineteenth century, considering those mentioned problems.

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Algoritmos para reconhecimento de 3-variedades utilizam-se do conceito de superfície normal, sendo assim, pode-se então tratar problemas de teoria de 3-variedades como sendo de programação linear. Como exemplos tem-se o Algoritmo de reconhecimento da 3-esfera triangulável de Rubinstein-Thompson que é implementado na suíte de software Regina, como a decomposição soma conexa de 3-variedades. A completa classificação de 3-variedades pode ser realizada por meio de algoritmos, possuindo assim relevância para o Programa de Geometrização de Thurston para obtenção de resultados inicialmente utilizando topologia computacional. O objetivo do presente trabalho é discorrer sobre uma aplicação do software Regina. Obteve-se durante a elaboração do presente trabalho, o resultado entre a comparação da 3-esfera homológica de Poincaré com a 3-esfera, parte importante para o entendimento da Conjectura de Poincaré e do Programa de Geometrização.

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The goal of this work is to perform a historical approach of important results about maxima and minima, on Euclidean geometry, involving perimeters, areas and volumes. As a highlight, we can mention the Dido’s isoperimetric problem and the Papus’s problem about the wit of the bees. In this context, with a concern didactic, we tried to use, whenever possible, the geometry classical formulas to the calculus of areas. On the other hand, in the case of isoperimetric inequality the techniques of differential and integral calculus became more suitable for our purposes.

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Neste trabalho estudaremos algumas propriedades geom´etricas do fractal “Esponja de Menger”, que é um objeto matemático construído através de um processo recursivo infinito que o torna auto-semelhante. Além disso, a dimens˜ao de um fractal n˜ao é necessariamente um número inteiro, diferentemente do que ocorre com os objetos da Geometria Euclidiana. Mais ainda, a Esponja possui área infinita e volume nulo, fatos que demonstraremos ao longo deste texto.

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Research partly motivated by Lewis Carroll's Euclid and his modern rivals (1879) portuguese translation, this paper presents some hermeneutical remarks taken as necessary to understand the context in which such book was produced. The paper focuses particularly on education, in general, and on the teaching of mathematics and Geometry in victorian England.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)