Minimal Surfaces
Mostrando 13-24 de 101 artigos, teses e dissertações.
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13. Some characterization, uniqueness and existence results for euclidean graphs of constant mean curvature with planar boundary
We establish the existence and uniqueness of solutions to the Dirichlet problem for the cmc surface equation, including the minimal one, for zero boundary data, in certain domains of the plane. We obtain results that characterize the sphere and cmc graphs among compact embedded cmc surfaces with planar boundary satisfying certain geometric conditions. We als
Publicado em: 2011
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14. Teoria de regularidade para equaÃÃes elÃpticas totalmente nÃo lineares com potenciais singulares e problemas de fronteira livre assintÃticos / Fully nonlinear singularly perturbed elliptic equations and limiting free boundary problems
In this work we develop a fully nonlinear theory for singularly perturbed elliptic equations problems with high energy activation. We esta-blish uniform and optimal gradient estimates of solutions and prove that minimal solutions are non-degenerated. For problems governed by concave equations, we establish uniform weak geometric properties of approximating l
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/11/2010
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15. Estimativas de autovalores para subvariedades de curvatura mÃdia localmente limitadas em N X R / Eigenvalue estimates for submanifolds with locally bounded mean curvature in N X R
Obtemos limites inferiores para o tom fundamental de conjuntos abertos em subvariedades com curvatura mÃdia localmente limitada no espaÃo produto N x R, onde N à uma variedade Riemanniana completa n-dimensional com curvatura seccional K à menor ou igual que a curvatura do espaÃo forma. Quando a imersÃo à mÃnima nossas estimativas sÃo Ãtimas.
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/07/2010
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16. New concept of space radiator with variable emittance
A new concept of space radiator of variable emittance for satellite thermal control is presented. The radiator is composed of two stages which exchange heat through radiation between finned surfaces covered with variable emittance coatings, whose emissivity is increased with temperature. Under cold conditions the radiative heat coupling between the stages is
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-12
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17. Raízes de aplicações de complexos 2-dimensionais em superfícies fechadas / Roots of maps from 2-dimensional complexes into closed surfaces
This text is the result of a detailed study of the topological root theory for maps from 2-dimensional CW complex into closed surfaces (compact and without boundary surfaces). Several approaches to the problems involved in this theory are presented, some of which are quite different with respect to the parameters of the classical theory
Publicado em: 2010
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18. Formas naturais e estruturação de superfícies mínimas em arquitetura
O paradigma forma segue a função, originado na biologia, indica uma invariável dependência entre a origem anatômica de partes de plantas e animais com as funções desempenhadas por estas partes. Embora este paradigma, na biologia, tenha sido superado após Lamarck, a arquitetura e o design ainda se utilizam de analogias biológicas para justificar esco
Publicado em: 2010
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19. Árvores de Steiner: Teoria, Geração Numérica e Aplicações / Steiner trees: Theory, Numerical Generation and Applications
Given a set of points in the plane, which we call terminals, one proves that they are always connected by a minimal graph called Steiner tree. The terminals may represent main connection route points, circuit elements or network computer servers. That is, the problem is to optimize traffic among the terminals whenever this is represented by a tree of shortes
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/12/2009
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20. As superfícies de costa triplamente periódicas / The triply periodic Costa surfaces
A tese de mestrado versa sobre o artigo A family of triply periodic Costa surfaces, que apresenta uma demonstração completa de unicidade e convergência para uma família contínua a um parâmetro de Superfícies Mínimas Triplamente Periódicas. No artigo, a demonstração é norteada por simulações numéricas em MatLab, que motivam as provas teóricas.
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/12/2009
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21. In vitro interactions between lactic acid solution and art glass-ionomer cements
OBJECTIVES: Production of acids such as lactic acid contributes to establish a cariogenic environment that leads to dental substrate demineralization. Fluoride plays an important role in this case and, as fluoride-releasing materials, glass-ionomer cements are expected to contribute to minimize deleterious reactions. This study evaluated interactions of glas
Journal of Applied Oral Science. Publicado em: 2009-08
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22. LIMITES OPERACIONAIS DO PROCESSO DE REVESTIMENTO POR CORTINA / OPERABILITY LIMITS OF THE CURTAIN COATING PROCESS
Curtain coating is one the preferred methods for precision multi-layer coatings at high speeds. Curtain coating belongs to the class of premetered coating methods. Liquid falls as a sheet, or curtain, freely over a considerable height and under the action of gravity before it impinges onto the substrate being coated. Edge guide are needed to maintain at spec
Publicado em: 2009
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23. Microbial load of reusables trocars after gynecology laparoscopy / Carga microbiana de trocartes reprocessaveis apos laparoscopias ginecologicas
The transmission of hospital infections is related to survival of microorganisms on environmental surfaces and surgical instruments. In recent years, Brazil has been facing a scenario scattered on the validation of cleaning and sterilizing surgical instruments used in minimally invasive procedures performed primarily for video. For implantation of effective
Publicado em: 2009
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24. Uma Representação de Weierstrass para Superfícies Mínimas em H3 e H2 × R.
The Weierstrass representation of minimal surfaces in R3 and its generalization to Rn shows is a very useful tool in the study of minimal surfaces in these spaces. In this work we want to describe a type Weierstrass representation for immersions simply connected in the group of Heisenberg H3. Using applications harmonics is possible obtain a formula for gene
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/08/2008