Similarity Transformations
Mostrando 1-12 de 32 artigos, teses e dissertações.
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1. On the similarity transformations in second quantized fermion-boson interacting hamiltonian and the BCS theory
Uma transformação de similaridade é uma relação de equivalência entre matrizes quadradas que preserva o determinante, traço e autovalores da matriz, tendo papel fundamental na mecânica quântica para fins de simplificar sistemas hamiltonianos muito complexos, o que permite melhorar de forma significativa as soluções analíticas no uso de teoria de
Rev. Bras. Ensino Fís.. Publicado em: 07/06/2016
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2. Flow of a Williamson fluid over a stretching sheet
In the present article, we have examined the two dimensional flow of Williamson fluid model over a stretching sheet. The governing equations of pseudoplastic Williamson fluid are modelled and then simplified by using similarity transformations and boundary layer approach. The reduced equations are then solved analytically with the help of homotopy analysis m
Braz. J. Chem. Eng.. Publicado em: 2013-09
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3. Magnetohydrodynamic axisymmetric flow of a third-grade fluid between two porous disks
This paper investigates magnetohydrodynamic axisymmetric flow of a third-grade fluid between two porous disks. The governing partial differential equations are transformed into ordinary differential equations by similarity transformations. The resulting non-linear problem is solved by a homotopy analysis method (HAM). The effects of dimensionless parameters
Braz. J. Chem. Eng.. Publicado em: 2013-09
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4. Double diffusive natural convection in power-law fluid saturated porous medium with Soret and Dufour Effects
The effects of double diffusive natural convection heat and mass transfer along a vertical plate embedded in a power-law fluid saturated Darcy porous medium in the presence of Soret and Dufour effects are studied. The governing partial differential equations are transformed into ordinary differential equations using similarity transformations and then solved
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012-12
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5. Computational modelling of MHD unsteady flow and heat transfer toward a flat plate with Navier slip and Newtonian heating
The combined effects of Navier slip and Newtonian heating on an unsteady hydromagnetic boundary layer stagnation point flow towards a flat plate in the presence of a magnetic field are studied. The self-similar equations are obtained using similarity transformations and solved numerically by a shooting algorithm with a Runge-Kutta Fehlberg integration scheme
Brazilian Journal of Chemical Engineering. Publicado em: 2012-03
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6. Uma abordagem de compressão de imagens através de sistemas de funções iteradas
A new image compression technique is proposed, based on the affine transformations (ATs) that define an iterated function system (IFS). Previous related research in the field has shown that an image may be approximated by iteratively subjecting a set of sub-regions to a group of ATs. In this case, the original image should be partitioned in regions, and each
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/08/2011
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7. Magnetic effect on free convection in a non-darcy porous medium saturated with doubly stratified power-law fluid
Natural convection heat and mass transfer along a vertical plate embedded in a doubly stratified power-law fluid saturated non-Darcy porous medium with uniform heat and mass flux is presented. The governing partial differential equations are transformed into ordinary differential equations using similarity transformations and then solved numerically. The eff
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-03
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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. Segmentation-free template matching in digital images invariant to similarity transformations. / Casamento de padrões em imagens digitais livre de segmentação e invariante sob transformações de similaridade.
Reconhecimento de padrões em imagens é um problema clássico da área de visão computacional e consiste em detectar um padrão ou objeto de referência (template) em uma imagem digital. A maioria dos métodos para esta finalidade propostos na literatura simplifica as imagens por meio de operações como binarização, segmentação e detecção de bordas
Publicado em: 2009
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10. Study of Cerrado physiognomies with Hyperion-EO-1 data / Estudo de fitofisionomias de Cerrado com dados do sensor Hyperion-EO-1
The study of the Brazilian savanna physiognomies (Cerrado) using remote sensing data is still a challenge due to floristic and structural diversity, variation in phenological response to precipitation, relationships with other biomes in the transition zones, and to fire and resultant effects. Because of these factors, some physiognomies are not separable in
Publicado em: 2009
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11. Isometrias e similaridades / Isometries and similarities
The objective of this work is to classify isometries and similarities on three dimensional Euclidean space. We present some historic facts about Geometry followed by a study on isometries and similarities using tools and concepts from groups. We also suggest some helpful activities to develop abilities in the investigation of symmetry groups of figures
Publicado em: 2008
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12. PARTITION CLUSTERING OF HIGH DIMENSIONAL LOW SAMPLE SIZE DATA BASED ON P-VALUES
This thesis introduces a new partitioning algorithm to cluster variables in high dimensional low sample size (HDLSS) data and high dimensional longitudinal low sample size (HDLLSS) data. HDLSS data contain a large number of variables with small number of replications per variable, and HDLLSS data refer to HDLSS data observed over time. Clustering technique p
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2008