Navegação Ciências Exatas e da Terra por Assunto "Física"
Resultados 1-20 de 98
-
Algunas consideraciones históricas, epistemológicas y didácticas para el abordaje de la teoría de la relatividad especial en el nivel medio y polimodal
(2002) [Artigo de periódico]En este trabajo se presentan una serie de consideraciones, emergentes de aportes recientes de la Historia de la Ciencia, la Filosofía de la Ciencia y la Didáctica de las Ciencias, relevantes para la introducción de la ... -
Análise descritiva e crítica dos trabalhos de pesquisa submetidos ao III ENPEC
(2002) [Artigo de periódico]São apresentados e, em alguns casos, comentados criticamente, dados estatísticos descritivos dos trabalhos de pesquisa em educação em ciências submetidos ao III Encontro Nacional de Pesquisa em Educação de Ciências, promovido ... -
Atomic transport and chemical stability during annealing of ultrathin Al/sub 2/O/sub 3/ films on Si
(2000) [Artigo de periódico]Ultrathin films of Al₂O₃ deposited on Si were submitted to rapid thermal annealing in vacuum or in oxygen atmosphere, in the temperature range from 600 to 800 °C. Nuclear reaction profiling with subnanometric depth resolution ... -
BK equation and traveling wave solutions
(2007) [Artigo de periódico]It has been shown that the transition to the saturation regime of high energy QCD is similar to the formation of the front of a traveling wave. In particular, it can be verified that Balitsky-Kovchegov (BK) evolution ... -
Chaos and coherence in the conservative three-mode decay interaction
(2000) [Artigo de periódico]In this work we analyze the influence of chaos on the coherence of the mismatched three-wave interaction. Chaos starts to play a decisive role in the problem when adiabatic approximations leading to an integrable model for ... -
Classical and quantum dynamics of a model for atomic-molecular Bose-Einstein condensates
(2006) [Artigo de periódico]We study a model for a two-mode atomic-molecular Bose-Einstein condensate. Starting with a classical analysis we determine the phase space fixed points of the system. It is found that bifurcations of the fixed points ... -
Coherence in scale-free networks of chaotic maps
(2004) [Artigo de periódico]We study fully synchronized states in scale-free networks of chaotic logistic maps as a function of both dynamical and topological parameters. Three different network topologies are considered: (i) a random scalefree ... -
Cold-fluid equilibrium for a corkscrewing elliptic beam in a variably focusing channel
(2000) [Artigo de periódico]It is shown that there exists a new class of cold-fluid corkscrewing elliptic beam equilibria for ultrahigh-brightness, space-charge-dominated beam propagation through a linear focusing channel consisting of uniform ... -
Computer simulation of the stochastic dynamics of super-paramagnetic particles in ferrofluids
(2006) [Artigo de periódico]Several papers have been written on the complex problem of the stochastic dynamics of the magnetic moments of super-paramagnetic particles, simultaneously with the stochastic rotation of these colloidal particles in a ... -
Coulomb heating of channeled H/sup + sub 2/ and H/sup + sub 3/ molecules in Si
(2004) [Artigo de periódico]Si-K x-ray and backscattering yields have been measured as a function of the projectile entrance angle for atomic and molecular (H2 + and H3 +) hydrogen ions channeling at kinetic energies of 150 keV per proton along the ... -
Cratering and plastic deformation in polystyrene induced by MeV heavy ions : dependence on the molecular weight
(2001) [Artigo de periódico]Cratering and plastic deformation induced by individual MeV ions on the surface of polystyrene thin films of different molecular weights (Mw) (from 3250 to 2 X 10⁷u) are investigated using scanning force microscopy. 20 ... -
Criticality in confined ionic fluids
(2001) [Artigo de periódico]A theory of a confined two-dimensional electrolyte is presented. The positive and negative ions, interacting by a 1/r potential, are constrained to move on an interface separating two solvents with dielectric constants e1 ... -
Crystal chemistry and structure of the orthorhombic (Fe, Mn)(Ta, Nb)/sub 2/O/sub 6/ family of compounds
(2001) [Artigo de periódico]In this paper we review the crystal chemistry and structure data from the literature and our results reported in the last decade for natural and synthetic samples of the tantalite-columbite series. Orderdisorder transitions ... -
Damage accumulation in neon implanted silicon
(2006) [Artigo de periódico]Damage accumulation in neon-implanted silicon with fluences ranging from 5x1014 to 5x1016 Ne cm-² has been studied in detail. As-implanted and annealed samples were investigated by Rutherford backscattering spectrometry ... -
Descrição da magnetoresistência faz 15 anos
(2003) [Artigo de periódico] -
Diffractive hadroproduction of W/sup +-/ and Z /sub 0/ bosons at high energies
(2007) [Artigo de periódico]Results from a phenomenological analysis of W and Z hard diffractive hadroproduction at high energies are reported. Using the Regge factorization approach, we consider the recent diffractive parton density functions extracted ... -
Disordered environments in spatial games
(2001) [Artigo de periódico]The Prisoner’s dilemma is the main game theoretical framework in which the onset and maintainance of cooperation in biological populations is studied. In the spatial version of the model, we study the robustness of cooperation ... -
D-meson production in d + Au process using a perturbative approach
(2005) [Artigo de periódico]The D-meson production at forward rapidities in d + Au processes is calculated using a pQCD based model, assuming that this treatment could be used as a baseline for distinct dynamical and medium effects. It is analysed ... -
Domain growth morphology in curvature-driven two-dimensional coarsening
(2007) [Artigo de periódico]We study the distribution of domain areas, areas enclosed by domain boundaries ("hulls”), and perimeters for curvature-driven two-dimensional coarsening, employing a combination of exact analysis and numerical studies, for ... -
Double meson production in ultraperipherical heavy-ion collisions
(2003) [Artigo de periódico]The double-meson production in ultraperipheral heavy-ions collisions is addressed, focusing on the particular case of ρJ/Ψ from two-photon reactions. The cross section at photon level is obtained using distinct parameterizations ...
