Listar Ciencias Exactas y Naturales por título
Mostrando ítems 3838-3857 de 5964
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Parametric estimation and spectral analysis of chaotic time series
(1995) [Artículo de periódico] -
Parâmetros no GeoGebra : um estudo sobre a circunferência
(2016) [Artículo de periódico]Este artigo apresenta uma pesquisa realizada com alunos do 3º ano do Ensino Médio de uma escola da rede privada da grande Porto Alegre, na qual o objetivo foi analisar as contribuições do software GeoGebra no estudo da ... -
Parâmetros técnicos para o aproveitamento ornamental dos granitóides Jaguari e Santa Rita, Região de Ibaré, Oeste do Escudo Sul-Rio-Grandense
(2005) [Artículo de periódico]The Jaguari and Santa Rita Intrusive suites crop out in the Ibaré region, Southwestern of Sul-rio-grandense Shield, around 340 km from Porto Alegre, Rio Grande do Sul State. These stratigraphic units contain granites of ... -
Para suas aulas de cinemática : o volante, um móvel bem comportado
(2004) [Artículo de periódico]Em cinemática são escassos os experimentos que permitem realizar medidas de tempo e distância com facilidade. Uma alternativa que tem sido bem aceita pelos professores de ensino médio é o "volante" (ou “rotor”). Trata-se ... -
Partial characterization of graphs having a single large Laplacian eigenvalue
(2018) [Artículo de periódico]The parameter (G) of a graph G stands for the number of Laplacian eigenvalues greater than or equal to the average degree of G. In this work, we address the problem of characterizing those graphs G having (G) = 1. Our ... -
Partial synchronization and spontaneous spatial ordering in coupled chaotic systems
(2001) [Artículo de periódico]A model of many symmetrically and locally coupled chaotic oscillators is studied. Partial chaotic synchronizations associated with spontaneous spatial ordering are demonstrated. Very rich patterns of the system are revealed, ... -
Partial synchronization on a network with different classes of oscillators
(2007) [Artículo de periódico]Complete and partial synchronization have been largely studied on networks of identical coupled oscillators. However, we study a network in which not all oscillators when uncoupled show the same dynamics and nonetheless ... -
A participação de Fletcher no experimento da gota de óleo de Millikan
(1995) [Artículo de periódico]O famoso experimento da gota de óleo, com o qual Millikan obteve valores altamente precisos para a carga do elétron, desempenhou papel importante para a concessão do seu Prêmio Nobel. O primeiro trabalho referente a essa ... -
Participação, identidade e autonomia.
(2001) [Artículo de periódico] -
Particle acceleration by large-amplitude waves revisited
(1997) [Artículo de periódico]We reconsider the problem of particle acceleration by large-amplitude electromagnetic waves. We make use of a fully relativistic Hamiltonian formalism to show that, as opposed to nonelativistic results obtained by Kuo and ... -
Particle-in-cell and weak turbulence simulations of plasma emission
(2019) [Artículo de periódico]The plasma emission process, which is the mechanism for solar type II and type III radio burst phenomena, is studied by means of particle-in-cell (PIC) and weak turbulence (WT) simulation methods. “Plasma emission” is meant ... -
Particle-in-cell simulations on spontaneous thermal magnetic field fluctuations
(2013) [Artículo de periódico]In this paper an electromagnetic particle code is used to investigate the spontaneous thermal emission. Specifically we perform particle-in-cell simulations employing a non-relativistic isotropic Maxwellian particle ... -
Partículas e interações
(2004) [Artículo de periódico] -
Parton saturation scaling function for exclusive production of vector mesons and deeply virtual Compton scattering
(2017) [Artículo de periódico]We provide a universal expression of cross sections for the exclusive vector meson production and deeply virtual Compton scattering (DVCS) in photon-proton and photon-nucleus interactions based on the geometric scaling ... -
Passivation of iron in solutions containing borate using rotating ring-disc measurements
(1999) [Artículo de periódico]Investigou-se o comportamento eletroquímico do ferro em soluções neutras de perclorato de sódio contendo pequenas concentrações de borato de sódio, através da técnica de voltametria cíclica e empregando-se eletrodo rotatório ... -
Passivation of n and p dopants in ion-implanted gaas by a 2D+ plasma
(1991) [Artículo de periódico]Strong n but weak p-carrier passivation was observed when Si- and Mg-implanted/annealed GaAs samples were exposed to a *D plasma under identical conditions. Even though a discrete band of dislocation loops was present in ... -
Pattern formation in diffusive-advective coupled map lattices
(2004) [Artículo de periódico]We investigate pattern formation and evolution in coupled map lattices when advection is incorporated, in addition to the usual diffusive term. All patterns may be suitably grouped into five classes: three periodic, ... -
Patternig method for silicides based on local oxidation
(1995) [Artículo de periódico]Oxidation of CoSi2 layers on Si~100! using oxidation masks has been investigated. It is shown that local oxidation can be used to pattern the silicide layer. This method allows the formation of buried interconnects and ... -
Pattern reconstruction and sequence processing in feed-forward layered neural networks near saturation
(2005) [Artículo de periódico]The dynamics and the stationary states for the competition between pattern reconstruction and asymmetric sequence processing are studied here in an exactly solvable feed-forward layered neural network model of binary units ... -
Patterns of accumulation and baseline values for metals in agricultural soils from a copper mining region in southern Peru
(2023) [Artículo de periódico]As global copper demand surges, it’s vital to conduct a thorough analysis of metal concentrations in the agricultural soils of mining districts. This is especially pertinent for the Andean region, where, in the face of ...