Closed Surfaces
Mostrando 13-24 de 37 artigos, teses e dissertações.
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13. Numerical investigation of aerothermodynamic in a reentry vehicle with surface discontinuity-like cavity / Investigação numérica da aerotermodinâmica de veículos na reentrada com imperfeições na superficie do tipo cavidade
In the design of hypersonic vehicles, the knowledge of factors that affects the thermal and aerodynamic loads acting on the vehicle surface becomes imperative. Usually, in the thermal load calculations, the analysis assumes that the vehicle has a smooth surface. However, discontinuities or imperfections are present on the surface of reentry vehicles. In this
Publicado em: 2010
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14. Desenvolvimento de transdutores paramétricos de alta sensibilidade para o detector de ondas gravitacionais mario schenberg
- The main purpose of this work was to build a set of parametric transducers of reentrant cavity type with high sensitivity and pumped at to be used in the gravitational wave detector Mario Schenberg. These transducers will monitor the mechanical vibrations of the -diameter spherical antenna in the frequency range. Niobium with high Tantalum impurities and w
Publicado em: 2009
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15. Falls and multidimensional factors involved: a longitudinal study of elderly residents in long-stay institutions in Goiânia (GO) / Quedas e fatores multidimensionais associados: estudo longitudinal de idosos residentes em instituições de longa permanência em Goiânia(GO)
Abstract xvii ABSTRACT Falling is a geriatric syndrome with multifactorial causes. Several studies confirm that fallings are frequent among institutionalized elders. The main objective of this study was to analyze the multidimensional factors associated with the falling episodes among elderly living at long-term care institutions in Goiania (GO) during the t
Publicado em: 2009
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16. On the use of unmanned aerial vehicle and the development of a data acquisition system of law cost for atmospheric sounding / Utilização de veículos aéreos não tripulados e desenvol-vimento de um sistema de aquisição de dados de baixo custo para sondagem atmosférica
This work describes the construction of an unmanned aerial vehicle (UAV) with electrical propulsion and instrumentation in order to obtain the vertical and horizontal profiles by measuring temperature, pressure, and GPS location, in surface atmosphere layer between two heterogeneous surfaces near terrain. Using embedded electronic, one developed and built a
Publicado em: 2008
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17. Geology of the Camboriú Complex (SC) / Geologia do Complexo Camboriú (SC)
The anatectic origin evidenced by known macrostructures in migmatites of the Camboriú Complex is supported by petrographical, geochemical and isotopic data, with partial melting under compressional regimen being suggested by the large amount of leucosome bodies at low-pressure sites represented by interboudins and dilation surfaces. Despite the continental
Publicado em: 2008
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18. Membrana de biopolÃmero de cana-de-aÃÃcar como substituto de dura-mÃter em ratos Wistar
Background: Duraplasty is necessary in nearly 30% of all neurological surgeries. Objectives: To determine the utilization of the sugar cane biopolymer membrane patch as a dural substitute in rats. Material and Methods: Forty adults males Wistar rats weighing 300-440g were randomly divided into two groups: a control and an experimental. All animals were anest
Publicado em: 2008
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19. Parametros para a escolha de superficies translucidas visando o conforto termico e visual na edificação / Parameters for selecting translucent susfaces focusing on the thermal and visual comfort on the building
This paper is directed towards translucent glasses and alveolar polycarbonates due to the lack of extensive research in this field. Nonetheless, these materials have been ostensively used in Europe and United States. In Brazil, translucent glasses and alveolar polycarbonates have been increasingly applied to building facades since the decade of 90s as a no
Publicado em: 2007
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20. Dynamics of two sliding magnetic surfaces
We use Monte Carlo and Molecular Dynamics simulation to study a magnetic tip-sample interaction. Our interest is to understand the mechanism of heat dissipation when the forces involved in the system are magnetic in essence. We consider a magnetic crystalline substrate composed of several layers interacting magnetically with a tip. The set is put thermally i
Brazilian Journal of Physics. Publicado em: 2006-09
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21. BifurcaÃÃo de SoluÃÃes PeriÃdicas
The purpose of this work is to study two bifurcation methods of differential equations periodic solutions. These methods leave to find periodic solutions of a perturbed system, when all solutions of non-perturbed system are periodic. We can apply this idea to determine the existence of closed geodesics in surfaces, which are perturbations of others surfaces,
Publicado em: 2006
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22. Classificação da aderência pneu-pavimento pelo índice combinado IFI - Internacional Friction Index para revestimentos asfálticos. / Adherence tire-asphalt through the classification index IFI - International Friction Index to Asphalt Pavements.
The characterization of the macrotexture and microtexture of asphalt pavements surfaces can be obtained by means of different types of equipment presenting different characteristics. The results of the essays obtained by these different equipment were compared and harmonized by an ample research developed by PIARC (Permanent International Association of Road
Publicado em: 2006
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23. "Enumeração dos fibrados vetoriais sobre superfícies fechadas" / "Enumeration of vector bundles over closed surfaces"
The aim of this work is enumerate the plane bundles over some surfaces, for example the sphere and the g-torus. Among other tools we used cohomology of the surfaces with local coefficients and also the method developed by Larmore to count homotopy classes of lifting of functions.
Publicado em: 2005
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24. Coordenadas Fricke e empacotamentos hiperbolicos de discos
This work searches elements to determine the packing density of spheres defined by lattices in the hyperbolic plane. We consider the teichmüller space Tg of all closed compacts oriented surfaces of genus 9 ~ 2, which has the hyperbolic plane as universal covering rienmannian surface. It is known that the system of Fricke coordinates in Tg associates each su
Publicado em: 2005