Results 61 to 70 of about 18,751 (162)

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
doaj   +1 more source

Effect of coarse-graining on detrended fluctuation analysis

, 2005
Several studies have investigated the scaling behavior in naturally occurring biological and physical processes using techniques such as detrended fluctuation analysis (DFA).
Ashkenazy, Ashkenazy, Chen, Hao, Hu, Kantelhardt, Linde, Makhoul, Peng, Peng, Podobnik, Proakis, Radhakrishnan Nagarajan, Tavare, Tou   +14 more
core   +1 more source

Analysis of the structural complexity of Crab Nebula observed at radio frequency using a multifractal approach

Journal of Physics: Complexity
The Crab Nebula is an astrophysical system that exhibits complex morphological patterns at different observing frequencies. We carry out a systematic investigation of the structural complexity of the nebula using publicly available imaging data at radio ...
Athokpam Langlen Chanu, Pravabati Chingangbam, Fazlu Rahman, R K Brojen Singh, Preeti Kharb   +4 more
doaj   +1 more source

Detection of Pipeline Leaks Using Fractal Analysis of Acoustic Signals

Fractal and Fractional
In this paper, the possibility of using monofractal and multifractal analysis of acoustic signals of pipelines to detect leaks is considered. An experimental stand has been created to study the fractal characteristics of acoustic signals of pipelines ...
Ayrat Zagretdinov, Shamil Ziganshin, Eugenia Izmailova, Yuri Vankov, Ilya Klyukin, Roman Alexandrov   +5 more
doaj   +1 more source

Are Pound and Euro the Same Currency? - Updated [PDF]

Based on long range dependence, some analysts claim that the exchange rate time series of the pound sterling and of an artificially extended euro have been locked together for years despite daily changes [1, 9].
Da Silva, Sergio, Figueiredo, Annibal, Gleria, Iram, Matsushita, Raul   +3 more
core   +1 more source

Critical Transitions In a Model of a Genetic Regulatory System

, 2014
We consider a model for substrate-depletion oscillations in genetic systems, based on a stochastic differential equation with a slowly evolving external signal. We show the existence of critical transitions in the system.
Berwald, Jesse, Gidea, Marian
core   +1 more source

Microstructure identification via detrended fluctuation analysis of ultrasound signals

, 2012
We describe an algorithm for simulating ultrasound propagation in random one-dimensional media, mimicking different microstructures by choosing physical properties such as domain sizes and mass densities from probability distributions.
A. R. Webb, André P. Vieira, D. Rumelhart, Elineudo P. Moura, H. E. Hurst, J. M. Hausdorff, P. S. Addison, Paulo G. Normando, R. O. Duda, Romão S. Nascimento, S. Haykin   +10 more
core   +1 more source

Investigating Stress During a Virtual Reality Game Through Fractal and Multifractal Analysis of Heart Rate Variability

Applied System Innovation
This article presents the process of creating a virtual reality (VR) game designed to assess the impact of stress on heart rate variability (HRV). The game features dynamic and challenging scenarios to induce stress responses, incorporating advanced 3D ...
Penio Lebamovski, Evgeniya Gospodinova
doaj   +1 more source

Impact of Tandem Repeats on the Scaling of Nucleotide Sequences

, 2005
Techniques such as detrended fluctuation analysis (DFA) and its extensions have been widely used to determine the nature of scaling in nucleotide sequences.
Bashir R., Doggett N. A., MEENAKSHI UPRETI, RADHAKRISHNAN NAGARAJAN, Tavare S.   +4 more
core   +1 more source

Spring onset forecast using harmonic analysis on daily mean temperature in Germany

Environmental Research Letters, 2020
The onset of spring is crucial for planning agricultural practices and has influences on animal activities as well. It is no doubt beneficial to properly forecast spring onset in advance.
Qimin Deng, Philipp G Meyer, Zuntao Fu, Holger Kantz   +3 more
doaj   +1 more source