CiteSeerX — Search Results — long-term correlation

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long-term correlations

by Anna Szostek, Andrzej A. Zdziarski, Michael L. Mccollough , 2008

"... Cyg X-3 is the brightest radio source among X-ray binaries (Mc-Collough et al. 1999). It is a high-mass system with a Wolf-Rayet companion (van Kerkwijk et al. 1996), but with an unusually short orbital period, P=4.8 h. It is located at a distance of d≃9 kpc ..."

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Cyg X-3 is the brightest radio source among X-ray binaries (Mc-Collough et al. 1999). It is a high-mass system with a Wolf-Rayet companion (van Kerkwijk et al. 1996), but with an unusually short orbital period, P=4.8 h. It is located at a distance of d≃9 kpc

On the Occurence of Extreme Events in Long-term Correlated and Multifractal Data Sets

by Mikhail I. Bogachev, Jan F. Eichner, Armin Bunde

"... Abstract—We review recent studies of the statistics of return intervals (i) in long-term correlated monofractal records and (ii) in multifractal records in the absence (or presence) of linear long-term correlations. We show that for the monofractal records which are long-term power-law correlated wi ..."

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Abstract—We review recent studies of the statistics of return intervals (i) in long-term correlated monofractal records and (ii) in multifractal records in the absence (or presence) of linear long-term correlations. We show that for the monofractal records which are long-term power-law correlated

AN AVERAGING PRINCIPLE FOR FAST DEGREES OF FREEDOM EXHIBITING LONG-TERM CORRELATIONS

by Christof Schütte, Jessika Walter, Carsten Hartmann, Wilhelm Huisinga , 2004

"... This article is concerned with the averaging principle and its extensions for stochastic dynamical systems with fast and slow degrees of freedom. It is demonstrated how the “conventional” averaging principle results from asymptotic multiscale analysis, how one can construct an indicator for its (in ..."

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(in-)appropriateness, and how, if inappropriate, it may be extended into an improved approximation. The conventional scheme contains averages over the entire accessible state space of the fast degrees of freedom and may thus fail if these fast degrees of freedom exhibit long-term (auto-)correlations

Statistical Analysis for Long Term Correlations in the Stress Time Series of Jerky Flow

by D. Kugiumtzis, E. C. Aifantis , 2004

"... Stress time series from the PLC effect typically exhibit stick-slips of upload and download type. These data contain strong short-term correlations of a nonlinear type. We investigate whether there are also long term correlations, i.e. the successive updown patterns are generated by a deterministic ..."

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Stress time series from the PLC effect typically exhibit stick-slips of upload and download type. These data contain strong short-term correlations of a nonlinear type. We investigate whether there are also long term correlations, i.e. the successive updown patterns are generated by a deterministic

SINGLE-MICROPHONE LATE-REVERBERATION SUPPRESSION IN NOISY SPEECH BY EXPLOITING LONG-TERM CORRELATION IN THE DFT DOMAIN

by Jan S. Erkelens, Richard Heusdens

"... We consider blind late-reverberation suppression in speech signals measured with a single microphone in noisy environments. We exploit that reverberant speech shows correlation over longer time spans than clean speech by predicting the contribution of reverberant energy to the current observed spect ..."

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noise reduction algorithm. The algorithm is shown to decrease the long-term correlation. It achieves significant improve-ments in segmental speech-to-interference ratio and Bark spectral distortion for typical reverberation times and noise levels, while almost no distortions are introduced in clean

On the long-term correlation between the flux in the Ca ii H & K and Hα lines for FGK stars

by J. Gomes Da Silva, N. C. Santos, I. Boisse, X. Dumusque, C. Lovis , 2013

"... Received date / Accepted date The re-emission in the cores of the Ca ii H & K and Hα lines, are well known proxies of stellar activity. However, these activity indices probe different activity phenomena, the first being more sensitive to plage variation, while the other one being more sensitive ..."

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to filaments. In this paper we study the long-term correlation between logR′HK and log IHα, two indices based on the Ca ii H & K and Hα lines respectively, for a sample of 271 FGK stars using measurements obtained over a ∼9 year time span. Because stellar activity is one of the main obstacles

A classification of the X-ray and radio states of Cyg X-3 and their long-term correlations

by Anna Szostek, Andrzej A. Zdziarski, Michael L. Mccollough - MNRAS

"... We present a detailed classification of the X-ray states of Cyg X-3 based on the spectral shape and a new classification of the radio states based on the long-term correlated behaviour of the radio and soft X-ray light curves. We find a sequence of correlations, starting with a positive correlation ..."

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We present a detailed classification of the X-ray states of Cyg X-3 based on the spectral shape and a new classification of the radio states based on the long-term correlated behaviour of the radio and soft X-ray light curves. We find a sequence of correlations, starting with a positive correlation