Results 11 to 20 of about 3,813 (146)
Multifractal analysis of solar flare indices and their horizontal visibility graphs [PDF]
Nonlinear Processes in Geophysics, 2012 The multifractal properties of the daily solar X-ray brightness, X<sub><i>l</i></sub> and X<sub><i>s</i></sub>, during the period from 1 January 1986 to 31 December 2007 which includes two solar cycles are ...
Z. G. Yu, V. Anh, R. Eastes, D.-L. Wang
doaj +1 more source
Brain and Behavior, Volume 13, Issue 11, November 2023., 2023 Post‐acute COVID syndrome is often associated with debilitating headache, but the neural mechanisms are understudied. In this study, the resting brain activity of individuals with post‐COVID headache showed suppression of scaling properties relative to COVID and non‐COVID groups without headache, providing novel insights into this highly prevalent ...
Nathan W. Churchill +18 more
wiley +1 more source
Research on Multifractal Characteristics of Vehicle Driving Cycles
Machines, 2023 Vehicle driving cycles have complex characteristics, but there are few publicly reported methods for their quantitative characterization. This paper innovatively investigates their multifractal characteristics using the fractal theory to characterize ...
Mengting Yuan +3 more
doaj +1 more source
The Different Types of Noise and How They Effect Data Analysis
Chemie Ingenieur Technik, Volume 95, Issue 11, Page 1758-1767, November 2023., 2023 Many noisy data in our daily life are not independent but exhibit short or long range correlations. The different kinds of correlations can considerably inuence the structure of a record and thus need to be considered in data analysis, in particular in the analysis of climate records that are known to exhibit long‐range correlations.
Armin Bunde
wiley +1 more source
Biotechnology Journal, Volume 18, Issue 8, August 2023., 2023 Graphical Abstract and Lay Summary The SPAD value is directly proportional to the nitrogen nutrition of crops. By analyzing the SPAD value, the growth status of plants can be understood, agricultural production management measures can be adjusted in a timely manner, and crop growth and development can be optimized.
Liang Li, Fei Li, Aiyu Liu, Xiaoyu Wang
wiley +1 more source
Journal of Geophysical Research: Planets, Volume 128, Issue 7, July 2023., 2023 Abstract We study the diurnal cycle of rapid thermal fluctuations observed by the Mars Environmental Dynamics Analyzer, onboard the Perseverance rover at Jezero Crater, as a function of local time and season. In this context, rapid refers to periods between 15 min and half a second. Some insight is also provided into wind fluctuations that are the base
M. de la Torre Juárez +14 more
wiley +1 more source
Activity‐related multifractal properties of Wi‐Fi signals
Electronics Letters, Volume 59, Issue 9, May 2023., 2023 Structural properties of IEEE 802.11n Wi‐Fi signals were examined by applying detrended fluctuation analysis to the channel state information traces. The outputs proved to be dependent on both human presence and activity in the room, which enabled to formulate highly distinctive classification criteria.
Milan Bjelica, Nikola Slavković
wiley +1 more source
Fractional Dynamics Foster Deep Learning of COPD Stage Prediction
Advanced Science, Volume 10, Issue 12, April 26, 2023., 2023 Chronic obstructive pulmonary disease (COPD) is one of the leading causes of death worldwide, usually associated with smoking and environmental occupational exposures. The COPD detection problem is addressed by constructing two novel COPD physiological signals datasets, demonstrating their complex coupled fractal dynamical characteristics, and ...
Chenzhong Yin +8 more
wiley +1 more source
Fractal Analysis of River Flow Fluctuations (with Erratum) [PDF]
, 2006 We use some fractal analysis methods to study river flow fluctuations. The result of the Multifractal Detrended Fluctuation Analysis (MF-DFA) shows that there are two crossover timescales at $s_{1\times}\sim12$ and $s_{2\times}\sim130$ months in the ...
Alados +72 more
core +2 more sources
Multi-fractal detrended fluctuation half-spectrum analysis of HRV
The Journal of Engineering, 2019 Electrocardiogram is a comprehensive reflection of cardiac electrical activity on the surface of the body. It is of great research value to analyse ECG signals and diagnose heart diseases.
Daoming Zhang +3 more
doaj +1 more source