Geometric Transformation
Mostrando 1-12 de 34 artigos, teses e dissertações.
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1. Optimization of shells modeled using NURBS subjected to a dynamic loading condition
Abstract This study presents an optimization method for the thickness of shell elements subjected to dynamic loads. Structural analyses were carried out using the finite element method. The analyzed domains were modeled using NURBS, and meshes were generated using a transformation of the parametric domain into the geometric domain via a geometric function. T
REM, Int. Eng. J.. Publicado em: 2020-03
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2. Nonlinear analysis of shape memory alloy beam under the thermal and the mechanical loads
ABSTRACT In this paper, the tension-compression asymmetry of shape memory alloys (SMA), subjected to the thermal and the mechanical loads, is sufficiently explored. Taking a basis of stress-strain relationship and a concern for critical phase transformation, a new simple model of mechanics is established. Through the deflection lines under different load con
Matéria (Rio J.). Publicado em: 20/05/2019
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3. Ontogenetic shape changes and sexual dimorphism in Aegla marginata Bond-Buckup and Buckup, 1994
ABSTRACT A study on relative growth, sexual dimorphism and ontogenetic trajectory was carried out in a population of the aeglidAegla marginata coming from Barrinha River, Iguape River Basin, Tunas do Paraná, Paraná State, Brazil. The size the of morphological sexual maturity was estimated for males and females. The analysis of sexual dimorphism and ontogen
An. Acad. Bras. Ciênc.. Publicado em: 14/05/2018
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4. Hybrid Geoid Model: Theory and Application in Brazil
Determination of the ellipsoidal height by Global Navigation Satellite Systems (GNSS) is becoming better known and used for purposes of leveling with the aid of geoid models. However, the disadvantage of this method is the quality of the geoid models, which degrade heights and limit the application of the method. In order to provide better quality in transfo
An. Acad. Bras. Ciênc.. Publicado em: 2017-09
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5. Potencialidades e possibilidades do ensino das transformações geométricas no Ensino Fundamental
This study intents to examine the possibilities and potential of Geometric Transformations in teaching Elementary School, a few discussed subject in the curriculum of this educational level. Performs a historical survey about the teaching of geometry and notes that the introduction of the theme of change is given from the Movement of Modern Mathematics. Iden
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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6. Geometria dinâmica no ensino de transformações no plano : uma experiência com professores da educação básica
Nesta dissertação apresentamos a concepção, implementação e validação de uma proposta para o ensino de transformações geométricas no plano usando o ambiente de geometria dinâmica GeoGebra. A proposta integra Geometria e Arte através da construção de pavimentações do plano e de mosaicos de Escher e foi dirigida para professores do ensino fund
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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7. Geometria e simetrias do emaranhamento
In the present work we present a geometric method to identify and measure the degree of entanglement of a two-qubit state. It is based on writing a map of the system state, from a non-unitary transformation. By introducing new parameters for such 4X4 matrix, the product of eigenvalues, two by two, acquire the form of squared 4D distances, having a Minkowski
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/05/2011
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8. Revisiting privacy preserving clustering by data transformation.
Preserving the privacy of individuals when data are shared for clustering is a complex problem. The challenge is how to protect the underlying data values subjected to clustering without jeopardizing the similarity between objects under analysis. In this short paper, we revisit a family of geometric data transformation methods (GDTMs) that distort numerical
Journal of Information and Data Management. Publicado em: 2011
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9. Avaliação de desempenho no georreferenciamento de imagens do sensor HR CCD (High Resolution Charge-Coupled Device) do Satélite CBERS-1
In this work it was analyzed the validation of CBERS-1 (China and Brazillian Earth Resourses Satellite) data related to qualitative and quantitative parameters that define the precision of its georeferencing. A topographical survey was carried out for the acquisition of ground control points spatially well distributed in the study area, employing differentia
Publicado em: 2011
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10. An application of the geometric algebra to the classical mechanic : the Kustaanheimo-Stiefel transformation / Uma aplicação da algebra geometrica a mecanica classica : a transformação de Kustaanheimo-Stiefel
In this dissertation we presented the Geometric Algebra of Euclidean Space and studied some of its properties. To exemplify its applications, we studied the Kustaanheimo-Stiefel Transformation in terms of Geometric Algebra. This purpose we presented initially the KS Transformation which regularizes the Kepler motion in three dimensions by removing a singular
Publicado em: 2010
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11. Um modelo de compressão de imagens digitais baseado em quantização vetorial e transformações afins
The fractal compression is an emerging digital image coding technique which explores the self-similarity present in digital images, showing good fidelity between the original image and the reconstructed image, achieving high compression rates. However it has some weaknesses and because it demands a considerable computational complexity commonly is used the a
Publicado em: 2008
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12. 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