Invariant Curves
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. Nonlinear Vibration and Mode Shapes of FG Cylindrical Shells
Abstract The nonlinear vibration and normal mode shapes of FG cylindrical shells are investigated using an efficient analytical method. The equations of motion of the shell are based on the Donnell’s non-linear shallow-shell, and the material is assumed to be gradually changed across the thickness according to the simple power law. The solution is provided
Lat. Am. j. solids struct.. Publicado em: 2017-03
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2. Solid-liquid stable phase equilibria of the ternary systems MgCl2 + MgB6O10+ H2O AND MgSO4 + MgB6O10 + H2O at 308.15 K
The solubilities and the relevant physicochemical properties of the ternary systems MgCl2 + MgB6O10 + H2O and MgSO4 + MgB6O10 + H2O at 308.15 K were investigated using an isothermal dissolution method. It was found that there is one invariant point, two univariant curves, and two crystallization regions of the systems. The systems belong to a simple co-satur
Braz. J. Chem. Eng.. Publicado em: 2014-03
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3. Existência e estabilidade de órbitas periódicas da Equação de Van der Pol-Mathieu / Existence and stability of periodic orbits of van der Pol-Mathieu equation
Neste trabalho alguns resultados sobre existência e estabilidade de soluções periódicas da equação de van der Pol-Mathieu são estudados. Por meio do Teorema da Média é provado, sob condições adequadas, que esta equação possui duas órbitas periódicas assintóticamente estáveis. Além disso é obtida a existência de cônicas invariantes no pla
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2012
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4. Família de aplicações bilhares geradas pelo fluxo de curvatura / Family of billiards maps generated by curvature flow
Descrevemos algumas propriedades dinâmicas de uma família de aplicações bilhares sobre curvas convexas (ovais) as quais são deformadas pelo fluxo de curvatura. Quando a mesa se deforma, a razão entre as curvaturas mínima e máxima converge a 1 e por um resultado clássico de Gage e Hamilton, depois de uma normalização, as curvas tendem a um círculo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/12/2011
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5. Scaling to generalize a single solution of Richards' equation for soil water redistribution
Using scaling methods, a single solution of Richards' equation (RE) will suffice for numerous specific cases of water flow in unsaturated soils. In this study, a new method is developed to scale RE for the soil water redistribution process. Two similarity conditions are required: similarity in the shape of the soil water content profiles as well as of the wa
Scientia Agricola. Publicado em: 2011-10
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6. Sobre distribuição e folheações holomorfas de codimensão maior do que um
Let w be a holomorphic LDS r-form on a complex manifold M. In the case M = Cn, we show that if ker(w) admits a trivial subbundle of rank k, then there exists a holomrphic LDS (r - k)-form n on Cn such that ! is the exterior product of k with the product of k linearly independent global sections of ker(w). In the case that M is compact and connected we approa
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/10/2010
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7. Finding invariant tori in the problem of a periodically corrugated waveguide
Some dynamic properties for a light ray suffering specular reflections inside a periodically corrugated waveguide are studied. The dynamics of the model is described in terms of a two dimensional nonlinear area preserving map. We show that the phase space is mixed in the sense that there are KAM islands surrounded by a large chaotic sea that is confined by t
Brazilian Journal of Physics. Publicado em: 2008-03
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8. GENUS THREE CURVES IN CHARACTERISTIC TWO / CURVAS DE GENÊRO TRÊS EM CARACTERÍSTICA DOIS
We study the variety M3 of curves of genus three in characteristic two. For each of the curves we compute the possible number of Weierstrass points, their weights, normalizations of many loci in the moduli space, and so on. We also deal with the concept of a Galois point.
Publicado em: 2003
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9. Aplicações harmonicas, estruturas-f, toros e superficies de Riemann nas variedades homogeneas
In this work we study the geometry of invariant f-structures and f-holomorphic curves on flag manifolds, and the construction of the equiharmonic tori on full complex flag manifolds which are not f-holomophic for any invariant f-estructure. Moreover we relate the tournament theory with the almost-complex on a flag manifolds. We compute the second variation o
Publicado em: 2002
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10. Cordas cosmicas e vortices em relatividade geral : pertubações radiais de soluções estaticas e estacionarias
A linearized theory of the dynamics of small perturbations of certain cylindrically symmetric systems in general relativity is presented. Firstly, we deal with straight, static cosmic strings of finite thickness in the U(l) gauge theory coupled to the Einstein equations. Taking into account the asymptotic behavior of the solution and certain integral ide
Publicado em: 1994
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11. Temperature Characteristics of Photosynthetic and Heterotrophic Activities: Seasonal Variations in Temperate Microbial Plankton
The seasonal variation in temperature characteristics of photosynthetic and heterotrophic activities in the microbial plankton of Bedford Basin, Nova Scotia, was investigated. Measurements were made of the photosynthetic uptake of [14C]bicarbonate and its incorporation into cellular protein as well as the heterotrophic uptake of 3H-labeled amino acids and th
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12. Issues in cDNA microarray analysis: quality filtering, channel normalization, models of variations and assessment of gene effects
We consider the problem of comparing the gene expression levels of cells grown under two different conditions using cDNA microarray data. We use a quality index, computed from duplicate spots on the same slide, to filter out outlying spots, poor quality genes and problematical slides. We also perform calibration experiments to show that normalization bet
Oxford University Press.