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Author Allagui, Anis ♦ Abdelkareem, Mohammad Ali ♦ Rojas, Andrea Espinel ♦ Bonny, Talal ♦ Elwakil, Ahmed S.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ♦ CHAOS THEORY ♦ DATASETS ♦ ELECTRIC POTENTIAL ♦ ELECTRODES ♦ ELECTROLYSIS ♦ ENTROPY ♦ FILTERS ♦ FLUCTUATIONS ♦ GLOW DISCHARGES ♦ LIQUIDS ♦ LYAPUNOV METHOD ♦ NONLINEAR PROBLEMS ♦ PERIODICITY ♦ PLASMA ♦ POTASSIUM HYDROXIDES ♦ SIGNALS ♦ TIME-SERIES ANALYSIS
Abstract In the standard two-electrode configuration employed in electrolytic process, when the control dc voltage is brought to a critical value, the system undergoes a transition from conventional electrolysis to contact glow discharge electrolysis (CGDE), which has also been referred to as liquid-submerged micro-plasma, glow discharge plasma electrolysis, electrode effect, electrolytic plasma, etc. The light-emitting process is associated with the development of an irregular and erratic current time-series which has been arbitrarily labelled as “random,” and thus dissuaded further research in this direction. Here, we examine the current time-series signals measured in cathodic CGDE configuration in a concentrated KOH solution at different dc bias voltages greater than the critical voltage. We show that the signals are, in fact, not random according to the NIST SP. 800-22 test suite definition. We also demonstrate that post-processing low-pass filtered sequences requires less time than the native as-measured sequences, suggesting a superposition of low frequency chaotic fluctuations and high frequency behaviors (which may be produced by more than one possible source of entropy). Using an array of nonlinear time-series analyses for dynamical systems, i.e., the computation of largest Lyapunov exponents and correlation dimensions, and re-construction of phase portraits, we found that low-pass filtered datasets undergo a transition from quasi-periodic to chaotic to quasi-hyper-chaotic behavior, and back again to chaos when the voltage controlling-parameter is increased. The high frequency part of the signals is discussed in terms of highly nonlinear turbulent motion developed around the working electrode.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-05-28
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 119
Issue Number 20


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