Sphere Geometry
Mostrando 1-12 de 36 artigos, teses e dissertações.
-
1. NOVEL SIMILARITY-SOLUTION WHICH IS APPLICABLE FOR FREE CONVECTION OVER A BODY OF ARBITRARY SHAPE: THERMAL NON-EQUILIBRIUM IN A POROUS MEDIUM
Abstract The study of the natural convection flow and heat transfer from hot surfaces in a porous medium has been of considerable interest in energy-related engineering problems. This paper is concerned with the free convection heat transfer over an arbitrary hot surface in a porous medium. It is assumed that the fluid and solid phases are not in local therm
Braz. J. Chem. Eng.. Publicado em: 2015-03
-
2. Reticulados algébricos : abordagem matricial e simulações / Algebraic lattices : matrix approach and simulations
Neste trabalho abordamos a construção de reticulados usando propriedades da Teoria Algébrica dos Números. Enfocamos a construção de alguns reticulados com características especiais, conhecidos na literatura, via reticulados ideais, através de uma abordagem matricial e algorítmica...Observação: O resumo, na íntegra, poderá ser visualizado no text
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/06/2012
-
3. Álgebras de Clifford e a fibração de Hopf / Clifford algebras and the Hopf fibration
Spin groups come in many forms in Mathematics and Mathematical Physics, having great importance in the theory of fiber bundles and differential operators defined on them. The concept of spin structure is derived from them, being the basis of all a theory, known as spin geometry. This thesis introduces the first concepts necessary for the study of such groups
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/02/2012
-
4. AÇO DUPLEX LDX 2101 SUBMETIDO À NITRETAÇÃO POR IMPLANTAÇÃO IÔNICA, IMPLANTAÇÃO IÔNICA POR IMERSÃO EM PLASMA E DESCARGA LUMINOSA: PROPRIEDADES MECÂNICAS E TRIBOLÓGICAS
In the present work showing the results on mechanical and tribological properties of duplex stainless steel LDX2101 nitriding by Ion Implantation (II), Plasma Immersion Ion Implantation (PI3) and Glow Discharge (GD). Nitrogen ion implantation was performed at room temperature and 350 C. The nitrogen fluencies were combined to obtain an atomic nitrogen concen
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/04/2011
-
5. Codigos esfericos em toros planares / Spherical codes on flat torus
Spherical codes in Euclidean spaces are finite sets of points on the surface of a multidimensional sphere and have been widely studied in connection with the signal transmission over a Gaussian channel. For this purpose one fundamental issue is to maximize the minimum distance between two code points, what is strongly related to the more general problem of s
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/07/2009
-
6. The density of lattice sphere packings / A densidade de empacotamentos esfericos em reticulados
This dissertation addresses the lattice theory with focus on packing density, which has many applications and allows to establish interesting connections between topics of linear algebra, calculus of several variables and discrete geometry. The first chapter is an introduction to the main concepts and properties of lattices. In the second chapter we discuss
Publicado em: 2009
-
7. Hipersuperfícies com curvatura média constante e hipersuperfícies com curvatura escalar constante na esfera. / Hypersurfaces with constant mean curvature and hypersurfaces with constant scalar in curvature sphere.
In this work we prove two theorems that characterize the hypersurfaces in the unitary sphere of dimension n+1. The first result, obtained by H. Alencar and M. do Carmo, classifies hypersurfaces with constant mean curvature in the sphere. This result was published in April 1994 in Proceedings of The American Mathematical Society, volume 120, number 4 with the
Publicado em: 2009
-
8. Trajectories on the earth s surfaces : a study of the geometry of the sphere in cartographical maps / Trajetorias sobre o globo terrestre : um estudo da geometria da esfera nos mapas cartograficos
Este trabalho buscou explorar os conceitos e propriedades da geometria da esfera no espaço usual e as projeções cartográficas cilíndricas, em especial, a de Mercator e a eqüidistante meridiana. Dentre os vários conceitos e aspectos históricos abordados no trabalho, destacamos o estudo comparativo entre duas maneiras de caminhar sobre o globo terrestr
Publicado em: 2009
-
9. O teorema de Alexandrov / The theorem of Alexandrov
O objetivo desta dissertação é apresentar uma demonstração de R. Reilly para o Teorema de Alexandrov. O teorema estabelece que As únicas hipersuperfícies compactas, conexas, de curvatura média constante, mergulhadas no espaço Euclidiano são as esferas. O teorema de Alexandrov foi provado por A. D. Alexandrov no artigo Uniqueness Theorems for Surfac
Publicado em: 2009
-
10. Lie curvature of Dupin hypersurfaces / Curvatura de Lie das hipersuperfícies de Dupin
In this work we study some results from the article of Tomas E. Cecil, On the Lie curvature of Dupin hypersurfaces [4]. We study the basic concepts of Lie sphere geometry, which given the framework for the study of Dupin hypersurfaces in the Lie sphere geometry. We construct example of a non-compact proper Dupin hypersurface immersed in Sn on which the Lie c
Publicado em: 2008
-
11. Reticulados e codigos / Lattices and codes
We approach here some problems related to minimizing the error probability in signals transmission over Gaussian and Rayleigh channels. Algebraic ideal lattice theory is used to construct rotations of the n-dimensional integer lattice via cyclotomic fields. This construction allows to evaluate the minimum product distance of the lattice, parameter which cont
Publicado em: 2008
-
12. Modelo Sparkle: novos avanÃos para o estudo quÃmico-quÃntico de complexos de lantanÃdeos
Since 1994, the Sparkle Model for Lanthanide Complexes has been used for the calculation of ground state geometries of only Eu(III) complexes. In the present thesis, we evolved the Sparkle Model and advanced Sparkle/AM1 and Sparkle/PM3: new paradigms for semiempirical quantum chemical calculations on lanthanide complexes. Parameterizations for all fifteen tr
Publicado em: 2007