Asymptotic Lines
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Semiumbilicidade e umbilicidade em superfícies imersas em Rn, n ≥ 4 / Semiumbilicity and umbilicity in surfaces immersed in Rn, n ≥ 4
Neste trabalho introduzimos o conceito de elipse de curvatura em um ponto de uma superfície imersa em Rn, n ≥ 4 com o objetivo de estudar as relações entre pontos semiumbílicos (pontos onde a elipse de curvatura se degenera em um segmento de reta), a existência de direções normais de umbilicidade à superfície e superfícies hiperesféricas. Pa
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/02/2011
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2. Idade e crescimento da tartaruga-cabeçuda (Caretta caretta) no litoral sul do Rio Grande do Sul / Age and growth of loggerhead sea turtle (Caretta caretta) in Southern Brazil
The juvenile and sub-adult stages of loggerhead sea turtles (Caretta caretta) are poorly studied in Brazil. We present age estimates and a growth model for loggerhead sea turtles in the South Atlantic Ocean obtained through skeletochronological analysis of humeri obtained from both neritic and oceanic stage individuals. Since it was validated that each incre
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/12/2010
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3. Inflexões de Linhas Assintóticas e de Linhas de Curvatura em Superfícies / Inflection of Asymptotic Lines and Lines of Curvature on Surfaces
Pontos quadráticos (ou pontos hiperbólicos especiais) são pontos em que uma superfície pode ser aproximada por uma quádrica até os termos de ordem três. Trataremos de uma conjectura que afirma que toda superfície hiperbólica fechada em RP3 não tem menos que oito pontos quadráticos distintos. Provaremos um resultado que afirma que; se uma superfíc
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/10/2010
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4. Tori embedded in S³ with dense asymptotic lines
Neste artigo são dados exemplos de toros T² mergulhados em S³ com todas as suas linhas assintóticas densas.
Anais da Academia Brasileira de Ciências. Publicado em: 2009-03
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5. On the divergence of line search methods
We discuss the convergence of line search methods for minimization. We explain how Newton's method and the BFGS method can fail even if the restrictions of the objective function to the search lines are strictly convex functions, the level sets of the objective functions are compact, the line searches are exact and the Wolfe conditions are satisfied. This ex
Computational & Applied Mathematics. Publicado em: 2007
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6. Spin pair correlation of the ANNNI chain in a field
We study the spin pair correlation function of the one-dimensional Ising model with competing nearest and next-nearest neighbor interactions, or ANNNI chain, in the presence of an external field. Of particular interest are the disorder lines where exponential decay of the spin pair correlation changes from monotonic to oscillatory. We extend previous studies
Brazilian Journal of Physics. Publicado em: 2000-12
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7. Line spectral analysis for harmonizable processes
Harmonizable processes with spectral mass concentrated on a number of straight lines are considered. The asymptotic behavior of the bias and covariance of a number of spectral estimates is described. The results generalize those obtained for periodic and almost periodic processes.
The National Academy of Sciences.
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8. Colored diffraction catastrophes.
On fine scales, caustics produced with white light show vividly colored diffraction fringes. For caustics described by the elementary catastrophes of singularity theory, the colors are characteristic of the type of singularity. We study the diffraction colors of the fold and cusp catastrophes. The colors can be simulated computationally as the superposition
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9. A Multi-Marker Model for Detecting Chromosomal Segments Displaying Qtl Activity
A statistical method is presented for detecting quantitative trait loci (QTLs), based on the linear model. Unlike methods able to detect a few well separated QTLs and to estimate their effects and positions, this method considers the genome as a whole and enables the detection of chromosomal segments involved in the differences between two homozygous lines,