Attempt to distinguish electric signals of a dichotomous nature

被引:173
作者
Varotsos, PA [1 ]
Sarlis, NV
Skordas, ES
机构
[1] Univ Athens, Dept Phys, Solid State Sect, Athens 15784, Greece
[2] Univ Athens, Dept Phys, Solid Earth Phys Inst, Athens 15784, Greece
来源
PHYSICAL REVIEW E | 2003年 / 68卷 / 03期
关键词
D O I
10.1103/PhysRevE.68.031106
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
Three types of electric signals were analyzed: Ion current fluctuations in membrane channels (ICFMC), Seismic electric signals activities (SES), and "artificial" noises (AN). The wavelet transform, when applied to the conventional time domain, does not allow a classification of these signals, but does so in the "natural" time domain. A classification also becomes possible, if we study <chi(q)>-<chi>(q) versus q, where chi stands for the "natural" time. For q values approximately between 1 and 2 the signals are classified and ICFMC lies between the other two types. For q=1, the "entropy" Sequivalent to<chilnchi>-<chi>ln<chi> of ICFMC almost equals that of a "uniform" distribution, while the AN and SES have larger and smaller S values, respectively. The recent [P. Varotsos, N. Sarlis, and E. Skordas, Phys. Rev. E 67, 021109 (2003)] finding that, in short time scales, both SES and AN (which are shown to be non-Markovian) result in comparable detrended fluctuation analysis exponents alphais an element of(1.0,1.5) is revisited. Even a Markovian dichotomous time series, in short time scales, leads to similar alpha exponents.
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页数:7
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