Minimal Surfaces
Mostrando 37-48 de 101 artigos, teses e dissertações.
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37. Experiments on the fundamental mechanisms of boiling heat transfer
The lecture presents a survey of results found by the author and his team during recent years. An experimental technique for precise and systematic measurements of entire boiling curves under steady-state and transient conditions has been developed. Pool boiling experiments for well wettingfluids and fluids with a larger contact angle (FC-72, isopropanol, wa
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-03
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38. Minimal sufaces foliated by circunferences / Superficies minimas folheadas por circunferencias
Minimal surfaces are known to be the ones with mean curvature zero. Classical exampIes are the catenoid, helicoid and the Scherk surface. Historically, they were associated with the property of minimizing area. However, they can even maximize it localIy for cases of normal variation which include the boundary. For fixed boundary, we shalI analyse when they r
Publicado em: 2005
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39. On properness of minimal surfaces with bounded curvature
Mostramos que as superfícies mínimas imersas no espaço euclideano de dimensão três, com curvatura limitada e autointersecções próprias, são próprias. Mostramos também que restrita às componentes amplas, a imersão é própria, independentemente do fato de ser a imersão inicial própria ou não. Antes destes resultados, era apenas conhecido que a
Anais da Academia Brasileira de Ciências. Publicado em: 2003-09
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40. Minimal surfaces in euclidean 3-space and their mean curvature 1 cousins in hyperbolic 3-space
Mostramos que as diferenciais de Hopf de um par de superfícies primas, a saber, uma superfície mínima em um espaço euclideano de dimensão 3 e uma superfície de curvatura média constante (CMC) um em um espaço hiperbólico de dimensão 3, se estendem holomorficamente em cada fim. Usando este resultado, obtemos condições para que o par seja um plano e
Anais da Academia Brasileira de Ciências. Publicado em: 2003-09
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41. Viability of pHEMA Hydrogels as Coating in Human Synovial Joint Prosthesis
In artificial joints, the bone part is usually substituted by a metallic component with high corrosion and strength resistance while the articular cartilage is replaced by a polymer. Use of thin layer of a compliant material acting as a bearing surface in human replacement joints has recently generated considerable interest. This work analyses the coating of
Materials Research. Publicado em: 2002-10
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42. The boundary value problem for maximal hypersurfaces
A spacelike hypersurface (condimension 1) in a Lorentzian manifold is called a maximal surface if it extremizes the hypervolume functional. Although maximal surfaces are superficially analogous to minimal hypersurfaces in Riemannian geometry, their properties can be dramatically different, as can be seen from the validity of Bernstein's theorem in all dimens
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43. Solution of the discrete Plateau problem.
We solve a discrete version of the classic Plateau problem, which asks for a minimal surface spanning a given curve. Our algorithm is based on a network-flow formulation that finds minimal slabs, intuitively corresponding to minimal "surfaces" of prescribed thickness. We let the slab thickness approach zero in order to obtain the desired minimal surface.
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44. EXISTENCE OF COMPLETE MINIMAL SURFACES OF ARBITRARY CONNECTIVITY AND GENUS*
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45. Existence of simply connected algebraic surfaces of general type with positive and zero indices
In the classification problem of algebraic surfaces of general type, an important conjecture states that for simply connected such surfaces Chern numbers satisfy the inequality c12 ≤ 2c2 (or equivalently, the index τ ≤ 0). We disprove this conjecture by computing fundamental groups of Galois coverings corresponding to generic CP2 projections of projecti
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46. Holomorphic Embedding of Complex Curves in Spaces of Constant Holomorphic Curvature
A special case of Wirtinger's theorem asserts that a complex curve (two-dimensional) holomorphically embedded in a Kaehler manifold is a minimal surface. The converse is not necessarily true. Guided by considerations from the theory of moduli of Riemann surfaces, we discover (among other results) sufficient topological and differential-geometric conditions f
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47. Incompressible minimal surfaces, three-dimensional manifolds with nonnegative scalar curvature, and the positive mass conjecture in general relativity
We study three-dimensional Riemannian manifolds with nonnegative scalar curvature. We find new topological obstruction for such manifolds. Our method turns out to be useful in studying the positive mass conjecture in general relativity.
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48. Cartilage fibrillation at the ankle joint in Liverpool necropsies.
The articular surfaces have been examined in 45 left ankle joints from a random series of adult necropsies in the city of Liverpool. Foci of overt fibrillation, with frank splitting of the articular cartilage surface, were extremely common in the ankle joint and were often already apparent in young adults. With increasing age overt fibrillation tended on the