Analytic Geometry
Mostrando 13-24 de 24 artigos, teses e dissertações.
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13. Boundary Element Method for Electrical Impedance Tomography / Método dos elementos de contorno para tomografia de impedância elétrica
The Electrical Impedance Tomography (EIT) is a quite new technique and has proved to be promising in obtaining inner body images exploring the differences between electric qualities (conductivity and permissity) of different materials that constitute it. The technique is based on applying an electric potential profile or electric current on the boundary of t
Publicado em: 2009
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14. O teorema da função implicita em um contexto aplicado e algumas conexões no calculo de areas de regiões planas / The implicit function thorem in an applied context and some connections in the calculus of the area of plane regions
The objective of this work is twofold. First, it presents an applied context for using the Implicit Function Theorem. This result allows to analyze the influence of the accuracy of the clocks involved in the working of the GPS (Global Positioning System), the receiver of which is a device used to locate the position of a point on the surface of the earth. Se
Publicado em: 2008
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15. Ferramentas computacionais para a anÃlise de dutos com defeitos de corrosÃo
Pipelines are one of the safest means for transport of petroleum and gas, and the one with the smallest risk to the environment. They also possess high efficiency and productivity. In spite of their exceptional capabilities, they are also a great source of concern of the petroleum companies, since they can be subjected to several types defects, in particular
Publicado em: 2008
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16. Seção de choque de absorção de buracos negros de Schwarzschild e de buracos acústicos canônicos / Section of shock of absorption of black holes of Schwarzschild and of canonical acoustic holes
In this dissertation we compute the absorption cross section of Schwarzschild black holes for the massless scalar and electromagnetic fields. We also compute the absorption cross section of canonical acoustic holes for sound waves. We use a numerical method to obtain the results in arbitrary frequencies. We also obtain analytic expressions for the low- and h
Publicado em: 2008
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17. O estudo do paralelismo no ensino da geometria analítica plana: do empírico ao dedutivo
This dissertation involves a study of argumentation and proof in relation to the teaching and learning of analytic geometry and particularly the property of parallelism in this topic. The work seeks answers to the following questions: in what form can dynamic geometry environments contribute in students attempts to construct mathematical arguments and proof?
Publicado em: 2007
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18. Las cargas superficiales y el flujo de energía en un circuito simple
The interest in the study of the superficial charges's distribution on the conductors that transport a current and its utility for the conceptual comprehension of the circuits's behavior have been increased recently. Numerous works and texts present numerical, analytic, and qualitative results for different geometries of the circuit's structure. The analytic
Revista Brasileira de Ensino de Física. Publicado em: 2005-12
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19. Numerical and experimental analysis of tube drawing with fixed plug
Numerical simulation of manufacturing processes has become in the last years an important tool to improve these processes reducing lead times and try out, and providing products free of defects and with controlled mechanical properties. Finite Element Method (FEM) is one of the most important methods to simulate metal forming. In tube drawing with fixed plug
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-12
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20. Oscilações de buracos negros / Black hole oscillations
In the past few years, black hole oscillations became a very interesting research area mainly due to the possibility of proving the existence of such celestial bodies through the gravitational radiation emitted by them. In this work, the study of the propagation of different kinds of incident waves on a black hole is presented under the mathematical point of
Publicado em: 2005
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21. EFFICIENT USE OF THE GEOESTATIONARY SATELLITE ORBIT: ORBITAL POSITION OPTIMIZATION / USO EFICIENTE DA ÓRBITA DE SATÉLITES GEOESTACIONÁRIOS: OTIMIZAÇÃO DAS POSIÇÕES ORBITAIS
This work is related to the efficient use of the geostationary satellite orbit. It presents and describes an optimization model which chooses the best orbital position for each satellite so that the length used orbital arc is minimized. A mathematical model considering aspects such as interference, geometry details (orbital position of the systems, earth sta
Publicado em: 2005
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22. Analysis of reinforced concrete pile-caps behaviour subjected to center top surfaces loading / Análise do comportamento de blocos de concreto armado sobre estacas submetidos à ação de força centrada
This work describes the behavior of rigid reinforced concrete pile-caps with one, two, three, four and five piles subjected to patches of loading on the center top surfaces of the column. Programs based on finite elements method were used to obtain numerical results and results obtained by means of analytic models were used. A comparative analysis was develo
Publicado em: 2004
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23. Minimal representations, geometric quantization, and unitarity.
In the framework of geometric quantization we explicitly construct, in a uniform fashion, a unitary minimal representation pio of every simply-connected real Lie group Go such that the maximal compact subgroup of Go has finite center and Go admits some minimal representation. We obtain algebraic and analytic results about pio. We give several results on the
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24. Modelling the unusual temperature dependence of atomic displacements in proteins by local nonharmonic potentials.
Recent x-ray studies of metmyoglobin at different temperatures [Frauenfelder, H. Petsko, G. A. & Tsernoglou, D. (1979) Nature (London) 280, 558-563] show that the dependence of the mean square displacements of individual atoms on the absolute temperature T can be described analytically by T mu, in which the parameter mu undergoes local variations in the rang