Results 31 to 40 of about 37,065 (229)

The Cardiodynamicsgram Based Early Detection of Myocardial Ischemia Using the Lempel-Ziv Complexity

IEEE Access, 2020
Background: Electrocardiogram (ECG) is a routine method for detecting myocardial ischemia in clinical practice, but more than half of ECGs are without specific ischemic changes.
Qinghua Sun, Qian Wang, Bing Ji, Weiming Wu, Weiyi Huang, Cong Wang   +5 more
doaj   +1 more source

On Gait Stability: Correlations between Lyapunov Exponent and Stride Time Variability

Current Directions in Biomedical Engineering, 2022
Lyapunov exponent is a promising parameter to ascertain the stability of the human gait. In this work, we use a time-series model based on a second-order delay-system with inertial measurement units placed on the foot and wrist.
Chandrasekaran Sanjay, Ngo Chuong, Lueken Markus, Bollheimer Cornelius, Wolf Alon, Leonhardt Steffen   +5 more
doaj   +1 more source

Generalized Lyapunov exponent as a unified characterization of dynamical instabilities

, 2014
The Lyapunov exponent characterizes an exponential growth rate of the difference of nearby orbits. A positive Lyapunov exponent is a manifestation of chaos.
Aizawa, Yoji, Akimoto, Takuma, Nakagawa, Masaki, Shinkai, Soya   +3 more
core   +1 more source

Probing phase transitions of regular black holes in anti-de Sitter space with Lyapunov exponent

European Physical Journal C: Particles and Fields
We investigate the relationship between thermodynamic phase transitions and the Lyapunov exponent of charged regular anti-de Sitter black holes in quasi-topological gravity. Our results show that the Lyapunov exponent displays multivalued behavior during
Hao Xie, Si-Jiang Yang
doaj   +1 more source

Probing thermodynamic phase transitions of 4D R-charged black holes via lyapunov exponent

Nuclear Physics B
We investigate the thermodynamic phase structure of four-dimensional R-charged black holes–characterized by four independent U(1) charges–through the lens of Lyapunov exponents associated with unstable circular orbits of both massless and massive ...
Mozib Bin Awal, Prabwal Phukon
doaj   +1 more source

Hamiltonian structure of Hamiltonian chaos [PDF]

, 1997
From a kinematical point of view, the geometrical information of hamiltonian chaos is given by the (un)stable directions, while the dynamical information is given by the Lyapunov exponents.
A.M. Boozer, Aizawa, Arnold, Arnold, Boozer, Boozer, Cary, Eckmann, Habib, Kolmogorov, Meiss, Moser, Oseledec, Pöschel, Ruelle, Schutz, Smith, Tang, Tang, X.Z. Tang   +19 more
core   +2 more sources

Scalable Platform Enabling Reservoir Computing With Nanoporous Oxide Memristors for Image Recognition and Time Series Prediction

Advanced Intelligent Systems, EarlyView.
The approach of physical in materia computing incorporates parallel computing within the medium itself. A scalable and energy‐efficient, oxide‐based computational platform is realized in form of a nanoporous network of volatile niobium oxide memristors sandwiched between top and bottom metallic electrodes, and then tested for prediction and ...
Joshua Donald, Ben A. Johnson, Amir Mehrnejat, Alex Gabbitas, Arthur G. T. Coveney, Alexander G. Balanov, Sergey Savel’ev, Pavel Borisov   +7 more
wiley   +1 more source

Probing the thermodynamics of charged Gauss Bonnet AdS black holes with the Lyapunov exponent

European Physical Journal C: Particles and Fields
In this paper, we investigate the thermodynamic properties of the charged AdS Gauss–Bonnet black holes and their associations with the Lyapunov exponent. The chaotic features of the black holes and the isobaric heat capacity characterized by the Lyapunov
Xin Lyu, Jun Tao, Peng Wang
doaj   +1 more source

Moment Lyapunov exponent of delay differential equations

International Journal of Mathematics and Mathematical Sciences, 2002
The aim of this paper is to establish a connecting thread through the probabilistic concepts of pth-moment Lyapunov exponents, the integral averaging method, and Hale's reduction approach for delay dynamical systems.
M. S. Fofana
doaj   +1 more source

Critical exponent for the quantum spin Hall transition in Z_2 network model

, 2011
We have estimated the critical exponent describing the divergence of the localization length at the metal-quantum spin Hall insulator transition. The critical exponent for the metal-ordinary insulator transition in quantum spin Hall systems is known to ...
Kobayashi, K., Ohtsuki, T., Slevin, K.
core   +1 more source