Coordinate Transformation
Mostrando 1-12 de 53 artigos, teses e dissertações.
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1. Radially Periodic Metasurface Lenses for Magnetic Field Collimation in Resonant Wireless Power Transfer Applications
Abstract In this paper, a new procedure and topology of magnetic metasurface lens are proposed for improving the performance of Resonant Wireless Power Transfer systems. Firstly, three subwave-length unit cells are optimized in order to get negative magnetic permeability in the same frequency, each one with a different refractive index, and they are experime
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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2. Three-Dimensional Reciprocal Invisibility Cloak with Multilayered Structure
Abstract We investigate a three-dimensional (3D) reciprocal invisibility cloak with a multilayered structure based on coordinate transformation theory and complementary media. There has been considerable research on invisibility cloaks such as the external cloak, which requires complex “anti-objects”, and closed cloaks of different shapes, in which the o
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 19/06/2019
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3. How the use of stratigraphic coordinates improves grade estimation
Abstract Some mineral deposits show mineralization along layers. These layers may pass through several subsequent geological events such as folding and/or severe erosional processes. Grades within these deposits tend to be correlated along orientations where the mineralization was originally deposited or along the same geological period (stratigraphic level)
Rem: Rev. Esc. Minas. Publicado em: 2015-12
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4. Dynamic response of a 120 mm smoothbore tank barrel during horizontal and inclined firing positions
AbstractIn this study, the dynamic interaction between a 120 mm smoothbore tank barrel modeled as an Euler-Bernoulli cantilever beam and an accelerating projectile during firing is presented. The interaction was modelled using a new FEM approach that took into account the projectile's inertia, Coriolis, and centripetal forces and the horizontal and inclined
Lat. Am. j. solids struct.. Publicado em: 2015-08
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5. Modelamiento geométrico del cambio de coordenadas UTM causadas por mudanza de referencial geodésico: Caso Sirgas - Chile
Technological advances in recent decades have allowed determining with increasing precision, parameters related to size, shape and gravitational field of the Earth. These new technologies and methods of observation and analysis, accept the use of different Geodetic Reference Systems (GRS) that enable the description of position of any point on Earth's surfac
Bol. Ciênc. Geod.. Publicado em: 2012-12
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6. Numerical and experimental study of solidification around the cylinder with and without the use of turbulence promoter / Estudo numerico e experimental da solidificação em torno de cilindro com e sem o uso de promotor de turbulencia
The process of solidification of a material of change of phase in a region annular around of a cylinder cooled by fluid passing in its interior is studied numerical and experimentally, objectifying applications in systems of storage of latent heat. The boundary immobilization technique is used for solving for phase-change problem. The coordinate transformati
Publicado em: 2009
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7. Método para o georreferenciamento de mapas urbanos baseado na atribuição de pesos aos pontos de controle / Method for the georreferencing of urban maps based on the attribution of weights to the control points
Para o georreferenciamento das informações extraídas dos mapas digitais são usados modelos matemáticos de transformação geométrica de coordenadas. O desempenho da transformação de coordenadas está diretamente relacionado à exatidão das coordenadas dos pontos de controle identificados no mapa, uma vez que devido ao uso da tecnologia GNSS, não ex
Publicado em: 2009
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8. Dirac equation: representation independence and tensor transformation
We define and study the probability current and the Hamiltonian operator for a fully general set of Dirac matrices in a flat spacetime with affine coordinates, by using the Bargmann-Pauli hermitizing matrix. We find that with some weak conditions on the affine coordinates, the current, as well as the spectrum of the Dirac Hamiltonian, thus all of quantum mec
Brazilian Journal of Physics. Publicado em: 2008-06
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9. Formalismo FDTD para a modelagem de meios dispersivos apresentando anisotropia biaxial / FDTD formalism for modelling of the dispersive media introducing biaxial anisotropy
This work introduces an extended two-dimensional finite difference time domain method (2D-FDTD) for the simulation of metamaterial based structures. The dispersive nature of these media is accurately taken into account through the inclusion of the Drude material models for the permittivity and permeability tensors. All tensor elements are properly accounted
Publicado em: 2008
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10. Modelagem matemática da condução de calor transiente e quase-estacionária no processo de refusão por eletroescória. / Quasi-steady and transient heat transfer mathematical model for electroslag remelting process.
A mathematical model for heat transfer in the electroslag remelting process (ESR) was implemented using the transient heat conduction equation in cylindrical coordinates. The solution of the equations was facilitated by using a change of the axial coordinate, also known as the Landau transformation, which fixed the calculation domain size during the ingot gr
Publicado em: 2008
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11. APLICAÇÃO DA TRANSFORMAÇÃO ORTOGONAL NO GEORREFERENCIAMENTO COM DIVISÃO DE ÁREA / APPLICATION OF THE ORTHOGONAL TRANSFORMATION IN GEORREFERENCIAMENTO WITH PARTITION OF AREAS
O avanço da geodésia, em seus métodos e equipamentos traz consigo a crescente necessidade da realização de levantamentos georreferenciados. Assim é possível compatibilizar vários levantamentos sem limites de extensão impostos pelo modelo plano e sem a sobreposição de pontos. Estes levantamentos geralmente são executados pelo rastreio de satélite
Publicado em: 2008
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12. Real time methods for positive, negative sequence and/or harmonics extraction. / Método de extração em tempo real de seqüência positiva, negativa e/ou harmônicos.
Harmonics and unbalances cause several problems to equipments connected to AC mains. This work proposes a real time method to obtain the positive and negative sequence components and/or harmonics that requires no coordinate transformation neither signal filtering. Numerical simulation and experimental results are shown to validate the proposed method. As exa
Publicado em: 2007