Results 21 to 30 of about 4,815 (160)

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

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

dynoGP: Deep Gaussian Processes for Dynamic System Identification

International Journal of Adaptive Control and Signal Processing, EarlyView.
This work introduces a novel class of deep models for system identification, dynamical deep Gaussian processes, which combine the strengths of data‐driven methods, such as those based on neural network architectures, with the ability to output a probability distribution for uncertainty representation.
Alessio Benavoli, Marco Forgione, Dario Piga, Marco Zaffalon   +3 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

Descriptors to Dynamics: A Materials and Device Perspective on in‐Materio Physical Reservoir Computing for Neuromorphic Edge Intelligence

Advanced Materials, EarlyView.
Intrinsic material dynamics are harnessed as computational resources for neuromorphic in‐materio physical reservoir computing. Defects, ionic motion, interfaces, percolation, geometry, and biasing shape transient states that provide fading memory, nonlinearity, and high‐dimensional projection for simple readout. A descriptor‐to‐dynamics framework links
Kshitij RB Singh, Alif Syafiq Kamarol Zaman, Muzhen Xu, Yuki Usami, Saptarshi Das, Hirofumi Tanaka   +5 more
wiley   +1 more source

Lyapunov Exponent Enhancement in Chaotic Maps with Uniform Distribution Modulo One Transformation

Chaos Theory and Applications, 2022
Most of the chaotic maps are not suitable for chaos-based cryptosystems due to their narrow chaotic parameter range and lacking of strong unpredictability.
Günyaz Ablay
doaj   +1 more source

From Flow to Function: Using Different Static Mixers to Fabricate Microarchitected Materials Via Chaotic Printing

Advanced Science, EarlyView.
Complex microarchitectures emerge from simple flow‐driven transformations as static mixers iteratively reorient and split material domains. Coupled with diverse deposition strategies, chaotic printing provides an accessible platform for fabricating architected materials that support biologically and chemically relevant processes. ABSTRACT Nature builds
Edna Johana Bolívar‐Monsalve, Carlos Fernando Ceballos‐González, Diego Alonso Quevedo‐Moreno, Irving Isaí Rendón‐Moreno, Ariel Cantoral‐Sánchez, Héctor Ambriz‐González, Mario Moisés Alvarez, Grissel Trujillo‐de Santiago   +7 more
wiley   +1 more source

Beyond the largest Lyapunov exponent: Entropy-based diagnostics of chaos in Hénon-Heiles and N-body dynamics

Astronomy & Astrophysics
Context. The largest Lyapunov exponent is widely used to diagnose chaos in gravitational dynamics; however, in mixed phase spaces and finite-N systems, it does not always provide a complete description of the orbital complexity and phase-space transport.
Trani Alessandro Alberto, Di Cintio Pierfrancesco, Ginolfi Michele   +2 more
doaj   +1 more source