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Estudo comparativo de técnicas de cascateamento de superfícies seletivas em frequência
(Universidade Federal do Rio Grande do NorteBRUFRNPrograma de Pós-Graduação em Engenharia ElétricaAutomação e Sistemas; Engenharia de Computação; Telecomunicações, 2009-08-12)
This work presents a theoretical and numerical analysis for the cascading of frequency selective surfaces, which uses rectangular patches and triangular Koch fractals as elements.
Two cascading techniques are used to ...
Floquet stroboscopic divisibility in non-Markovian dynamics
(2018)
We provide a general description of a time-local master equation for a system coupled to a non-Markovian reservoir based on Floquet theory. This allows us to have a divisible dynamical map at discrete times, which we refer ...
Harmonic distortion analysis based on Hopf bifurcation theorem and fast fourier transform
(World Scientific, 2007-12)
A frequency domain method is used to estimate the harmonic contents of a smooth oscillation arising from the Hopf bifurcation mechanism. The harmonic contents up to the eighth-order are well estimated, which agree with the ...
On period doubling bifurcations of cycles and the harmonic balance method
(Pergamon-Elsevier Science Ltd, 2006-02)
This works attempts to give quasi-analytical expressions for subharmonic solutions appearing in the vicinity of a Hopf bifurcation. Starting with well-known tools as the graphical Hopf method for recovering the periodic ...
Low-amplitude variations detected by CoRoT in the B8IIIe star HD 175869
(EDP SCIENCES S A, 2009)
Context. The origin of the short-term variability in Be stars remains a matter of controversy. Pulsations and rotational modulation are the components of the favored hypothesis. Aims. We present our analysis of CoRoT data ...
Non-resonant double Hopf bifurcations: The complex case
(Academic Press Ltd - Elsevier Science Ltd, 2009-04-24)
The analysis of the unfolding of a non-resonant double Hopf singularity is considered using the frequency domain and the normal form methodologies. A higher-order harmonic balance and the evaluation of Floquet multipliers ...