In this work we analyzed experimental chaotic time series data from three known chaotic systems using the orthogonal wavelet transform. The experimental electronic implementation of the chaotic systems was used to analyze them. The wavelet analysis of the experimental chaotic…

Approximated analytic solutions for wave propagation in graded-index optical fiber have been found in the case of a parabolic profile. Approximants with high accuracy are presented that are much better than those found by other authors. A two-point quasi-rational method…

In this paper we compare operator splitting methods of first, second, third and fourth orders that are applied to problems with stiff matrices. In order to efficiently solve the resultant subproblems is necessary to use implicit Runge-Kutta methods. It is…

Photoinduced refractive index and absorption anisotropies in thin films of an azo dye polymer have been carried out by pump-probe experiments. A refractive index change of Δn=-0.04 was obtained by independently measuring the two indices, parallel and perpendicular to pump…

An unphysical result for the Landau-Lifshitz equation of motion for a charged particle is presented. The similarity with the Lorentz-Dirac equation is discussed. Indeed the reaction force obtained for the uniform electric field vanishes when the motion is parallel to…

Copper atoms have been introduced by diffusion in NaCl, KCl and KBr crystals at 500°C. The crystals have been optically analyzed with photoluminescence measurements and by scanning electron microscopy. The emission and excitation spectra measured at low temperatures show the…

The bulk atomic equations of motion are revisited in order to show explicitly, for high symmetry directions, the transformation of this three-dimensional problem into decoupled one-dimensional problems. The force constants of the corresponding one-dimensional equations are related to a larger…

Diffusion of different fluids was studied in disordered pore matrices by computer simulations. The matrices were formed using zeolite parameters with two distinct methods. In the first method, the matrix was prepared from a set of particles with a fixed…

Behavior of the Dynamic Stress Intensity Factor (DSIF) in cracked plates and tubular elements is analyzed. The finite Element Method was used to validate the procedure used by Chen to determine DSIF in a centrally cracked plate loaded with a…

In this work the numerical results of the heat transfer by natural convection in a tilted open cubic cavity are presented. The most important assumptions in the mathematical formulation are two: the flow is laminar, and the Boussinesq approximation is…