Conics
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Um estudo das cônicas na perspectiva da geometria projetiva / A study of the conic in the perspective of projective geometry
Esta dissertação tem por objetivo apresentar o estudo das Cônicas e suas propriedades, mediante a perspectiva da Geometria Projetiva, bem como propor o software livre GeoGebra como uma alternativa para visualização dos Teoremas de Geometria Projetiva e das propriedades das Cônicas. O trabalho inicia-se com uma introdução histórica do desenvolvimento
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/02/2012
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2. Construção de separadores globalmente suaves para conjuntos de pontos no R2 e geração de base mínima / Construction of globally smooth separators for sets of points in R2 and generation of minimum basis
Esta tese tem duas partes relativamente independentes. A primeira estuda o problema de construir uma curva suave (C1) que separa dois conjuntos de pontos do plano. Especificamente, a curva é definida por uma equação implícita F(x, y) = 0 onde F é uma spline polinomial de grau 2 com continuidade adequada. O objetivo é determinar uma única cônica se po
Publicado em: 2011
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3. Interger fatorization and groups on conics / Fatoração de inteiros e grupos sobre conicas
The objective of this paper is to factorize integer number using rational points on the unitary circle. Also, it intends to determinate some groups on the conics. The research begins with the basic concepts of Algebra and Number Theory ensuring that the rational points set on the unitary circle has a structure of group. From this set is possible to extend th
Publicado em: 2009
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4. Bilhar de Poncelet
In Applications dAnalyse et de G´eom´etrie, 1862, Poncelet presents a work about pairs of conics holding an inscribe polygon at one and simultanealy circunscribe at another. He proves that when there exists a polygon satisfying this property,then there exist infinitely many polygons with the same number of edges satisfying its too. In this work we are inte
Publicado em: 2007
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5. Orbital control of a satellite using the gravity of the Moon
In this paper, a study is made in the problem of the orbital control of an Earth´s satellite using the gravity of the Moon. The main objective is to study a technique to decrease the fuel consumption of a plane change maneuver to be performed in a satellite that is in orbit around the Earth. The main idea of this approach is to send the spacecraft to the Mo
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-03
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6. Universal closed-form of lagrangian multipliers for coast-arcs of optimum space trajectories
An universal closed-form solution of Lagrangian multipliers for the coast-arcs of optimum space trajectories in a Newtonian central force field is obtained by means of properties of generalized canonical systems and Sundman transformation. This closed-form solution, valid for all conics, is given as a function of a generalized anomaly.
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2003-12
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7. Threefolds whose canonical bundles are not numerically effective
Let X be an arbitrary nonsingular projective 3-fold whose canonical bundle is not numerically effective. Then we have: (i) X contains an exceptional divisor of several types, which we classify explicitly, (ii) X has a morphism to a projective nonsingular surface whose fibers are conics, (iii) X has a morphism to a projective nonsingular curve whose general f