Results 41 to 50 of about 5,580 (241)
Complexity signatures in the geomagnetic H component recorded by the Tromsø magnetometer (70° N, 19° E) over the last quarter of a century [PDF]
Nonlinear Processes in Geophysics, 2014 Solar disturbances, depending on the orientation of the interplanetary magnetic field, typically result in perturbations of the geomagnetic field as observed by magnetometers on the ground.
C. M. Hall
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INTERPRETATION OF VIBRATION SIGNALS OF COMPLEX ROTOR SYSTEM BASED ON FRACTAL ANALYSIS
Авіаційно-космічна техніка та технологія, 2019 The work analyzes vibration signals obtained by simulating a turbine of a complex rotor system, for example, an aviation gas turbine engine, under conditions of stationary and non-stationary excitations. Four modes of vibration excitation are considered:
Надія Іванівна Бурау +1 more
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Temporal Interference Stimulation Enhances Neural Regeneration
Advanced Science, EarlyView.Temporal interference (TI) stimulation is proposed as a non‐invasive approach to enhance neural regeneration in the deep brain. Theta‐band TI modulation selectively promotes neural progenitor cell differentiation in vitro and augments hippocampal neurogenesis in amouse model of Alzheimer's disease‐like amyloidosis.
Sofia Peressotti +15 more
wiley +1 more source
Monitoring Pipeline Leaks Using Fractal Analysis of Acoustic Signals
Fractal and FractionalThis paper proposes a method for searching for pipeline leaks by analyzing the Hurst exponent of acoustic signals. The investigations conducted on the laboratory setup and the current pipelines of the water supply system.
Ayrat Zagretdinov +5 more
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HURST EXPONENTS AND DELAMPERTIZED FRACTIONAL BROWNIAN MOTIONS [PDF]
International Journal of Theoretical and Applied Finance, 2019 The inverse Lamperti transform of a fractional Brownian motion (fBm) is a stationary process. We determine the empirical Hurst exponent of such a composite process with the help of a regression of the log absolute moments of its increments, at various scales, on the corresponding log scales.
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Monitoring the depth of anaesthesia using Hurst exponent and Bayesian methods
, 2014 This study proposes a novel index MLDoA to identify different anaesthetic states of a patient during surgery. Based on the new index MLDoA, the assessment of depth of anaesthesia (DoA) for a patient can be clearly monitored.
Nguyen-Ky, Tai, Wen, Peng, Li, Yan
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Earth and Space ScienceThe radar surface echo can be separated into coherent and incoherent components by statistical approaches, and the coherent component can be described by a backscattering model related to the RMS height.
Tiansheng Hong +9 more
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A self-organized critical model and multifractal analysis for earthquakes in Central Alborz, Iran
Scientific Reports, 2022 This paper is devoted to a phenomenological study of the earthquakes in central Alborz, Iran. Using three observational quantities, namely the weight function, the quality factor, and the velocity model in this region, we develop a modified dissipative ...
M. Rahimi-Majd, T. Shirzad, M. N. Najafi
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Estimation of the Hurst Parameter in Spot Volatility
Mathematics, 2022 This paper contributes in three stages in a logic of the cognitive process: we firstly propose a new estimation of Hurst exponent by changing frequency method which is purely mathematical.
Yicun Li, Yuanyang Teng
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Geophysical Research Letters, 2001 Analysis of the Nile river level height time series enabled Harold Edwin Hurst to derive an empirical tH (H > 0.5) law. Reanalysis of the data shows that the result may cause some misunderstanding in using the terms persistence and antipersistence to characterize the series' governing process.
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