Log Periodic
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. Semi-analytical formulation for a Unified Time and Frequency Antenna Characterization
AbstractThe definition of parameters that characterize the radiation of electric and magnetic fields for antennas in the time and frequency domain on an unified representation is proposed. The formulation uses a straightforward semi-analytical formulation that can be subsequently applied on the analysis of excited antennas for an arbitrary source with tempor
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2015-06
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2. Effect of contrast and gaps between Vernier stimulus elements on sweep visual evoked potential measurements of human cortical Vernier responses
The present paper focuses on a classic hyperacuity, Vernier acuity-the ability to discriminate breaks in the collinearity of lines or edges on the order of only arcseconds of visual angle. We measured steady-state sweep visual evoked potentials (sVEPs) in response to 6 Hz periodic breaks in collinearity (Vernier offsets) in horizontal squarewave gratings. Ve
Psychol. Neurosci.. Publicado em: 2013
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3. Arranjos Log-Periódicos Compactos em Microfita com Elementos Fractais de Koch / Arranjos Log-Periódicos Compactos em Microfita com Elementos Fractais de Koch
This work aims to present how the application of fractal geometry to the elements of a log-periodic array can become a good alternative when one wants to reduce the size of the array. Two types of log-periodic arrays were proposed: one with fed by microstrip line and other fed by electromagnetic coupling. To the elements of these arrays were applied fractal
Publicado em: 2010
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4. Dynamics towards the Feigenbaum attractor
As an essential component in the demonstration of an atypical, q-deformed, statistical mechanical structure in the dynamics of the Feigenbaum attractor we expose, at a previously unknown level of detail, the features of the dynamics of trajectories that either evolve towards the Feigenbaum attractor or are captured by its matching repellor. Amongst these fea
Brazilian Journal of Physics. Publicado em: 2009-08
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5. Expoente de Hurst e diagrama de fase para persistência induzida amnesticamente em processos não-markovianos. / Hurst exponent and the phase diagram for persistence induced amnestic on a non-Markovian
Nowadays there has been a growing interest in anomalous diffusion: the super difusive and sub-difusive processes. The problem about normal diffusion already well established whereas many problems still exist in anomalous diffusion. Several mathematical models and computational techniques have been developed to model such processes. In this work we studied a
Publicado em: 2009
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6. Transição entre os comportamentos estendido e localizado em caminhadas estocásticas parcialmente auto-repulsivas em sistemas desordenados unidimensionais / Transition between the extended and localized regimes in stochastic partially self-avoiding walks in one-dimensional disordered systems
Consider $N$ sites randomly and uniformly distributed in a $d$-dimensional hypercube. A walker explores this disordered medium going to the nearest site, which has not been visited in the last $\mu$ (memory) steps. The walker trajectory is composed of a transient part and a periodic part (cycles). In this case, travelers can or cannot explore all available s
Publicado em: 2009
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7. The log-periodic function and its application in the forecast of the reversion of trends by means of the graphical analysis of the Brazilian shareholding market / A função log-periódica e sua aplicação na previsão da reversão de tendências por meio da análise gráfica do mercado acionário brasileiro
The purpose of present work is to show that the log-periodic function can be used in Technical Analysis as an oscillator, which anticipates trend reversions. The tests show its usefulness and the advantages of its utilization, once meaningful differences appear when its results are compared with those of moving averages, RSI , MACD and trend reversals.
Publicado em: 2008
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8. UMA INVESTIGAÇÃO ECONOMÉTRICA DO MODELO LOG-PERIÓDICO PARA PREVISÃO DE CRASHES FINANCEIROS / THE LOG PERIODIC MODEL FOR FINANCIAL CRASHES FORECASTING: AN ECONOMETRICINVESTIGATION
In this work we employ a model based on the critical phenomena theory to explain the asset price formation associated to the pre- crash period. The evolution of the price is given by an over-all power law acceleration decorated by oscillations called log-periodic model. This growth is likely to be interrupted by a crash of prices that happen in a short and c
Publicado em: 2006
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9. Emergence of log-periodic oscillations in periodic and aperiodic Ising models
This work analyzes the emergence of log-periodic oscillations in thermodynamic functions of Ising models on hierarchical lattices. Several situations, where the exchange interactions are periodic or aperiodic, are taken into account. High precision values for the thermodynamic functions are numerically obtained with the method of transfer matrices. Fitting t
Brazilian Journal of Physics. Publicado em: 2000-12
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10. Antimicrobial Action of Carvacrol at Different Stages of Dual-Species Biofilm Development by Staphylococcus aureus and Salmonella enterica Serovar Typhimurium
The effects of carvacrol, a natural biocide, on dual-species biofilms formed by Staphylococcus aureus and Salmonella enterica serovar Typhimurium were investigated with a constant-depth film fermentor. Biofilm development reached a quasi-steady state in 12 days at 25°C with S. aureus predominance (≈99%). Cryosectional analysis detected viable S. aureus an
American Society for Microbiology.
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11. Enhanced Reduction of Helicobacter pylori Load in Precolonized Mice Treated with Combined Famotidine and Urease-Binding Polysaccharides
The present study investigated the effect of a model urease-binding polysaccharide in combination with a histamine H2 receptor antagonist on Helicobacter pylori colonization in vivo. Euthymic hairless mice were treated daily with dextran sulfate via drinking water and/or famotidine via intragastric gavage starting at 1 week postchallenge with a CagA+ VacA+ (
American Society for Microbiology.
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12. Sporadicity: Between periodic and chaotic dynamical behaviors
We define the class of sporadic dynamical systems as the systems where the algorithmic complexity of Kolmogorov [Kolmogorov, A. N. (1983) Russ. Math. Surv. 38, 29-40] and Chaitin [Chaitin, G. J. (1987) Algorithmic Information Theory (Cambridge Univ. Press, Cambridge, U.K.)] as well as the logarithm of separation of initially nearby trajectories grow as nv0(l