A5029470947- Nonlinear Dynamics and Pattern Formation
- Chaos control and synchronization
- Quantum chaos and dynamical systems
- Climate variability and models
- Geomagnetism and Paleomagnetism Studies
- Meteorological Phenomena and Simulations
- Fluid Dynamics and Turbulent Flows
- stochastic dynamics and bifurcation
- Neural dynamics and brain function
- Oceanographic and Atmospheric Processes
- Magnetic and Electromagnetic Effects
- Advanced Differential Equations and Dynamical Systems
- Solar and Space Plasma Dynamics
- Chaos-based Image/Signal Encryption
- Planetary Science and Exploration
- Marine and coastal ecosystems
- Target Tracking and Data Fusion in Sensor Networks
- Nonlinear Photonic Systems
- Ocean Waves and Remote Sensing
- Speech and Audio Processing
- Fluid Dynamics and Thin Films
- Advanced Thermodynamics and Statistical Mechanics
- Nonlinear Waves and Solitons
- Scientific Research and Discoveries
- Complex Systems and Time Series Analysis
University of Oxford
2015-2024
Mathematical Institute of the Slovak Academy of Sciences
2002-2024
Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology
2024
Sultan Zainal Abidin University
2024
Université Larbi Tébessi
2024
Sakarya University
2017-2019
Sakarya Uygulamalı Bilimler Üniversitesi
2019
Ankara University
2019
University of Wisconsin–Madison
2017
China University of Geosciences
2017
Voice disorders affect patients profoundly, and acoustic tools can potentially measure voice function objectively. Nonetheless, existing are limited to analysing voices displaying near periodicity, do not account for inherent biophysical nonlinearity non-Gaussian randomness. They directly complex nonlinear aperiodicity, turbulent, aeroacoustic, Often these have clinical usefulness. This paper introduces two new speech analysis: recurrence fractal scaling, which overcome the range limitations...
As part of a programme in which quantum state reduction is understood as gravitational phenomenon, we consider the Schrödinger-Newton equations. For single particle, this coupled system consisting Schrödinger equation for particle moving its own field, where generated by probability density via Poisson equation. Restricting to spherically-symmetric case, find numerical evidence discrete family solutions, everywhere regular, and with normalizable wavefunctions. The solutions are labelled...
We report on the finding of hidden hyperchaos in a 5D extension to known 3D self-exciting homopolar disc dynamo. The is identified through three positive Lyapunov exponents under condition that proposed model has just two stable equilibrium states certain regions parameter space. new hyperchaotic dynamo multiple attractors including point attractors, limit cycles, quasi-periodic dynamics, chaos or hyperchaos, as well coexisting attractors. use numerical integrations create phase plane...
Simple chaotic systems are useful tools for testing methods use in numerical weather simulations owing to their transparency and computational cheapness. The Lorenz system was used here; the full defined as ‘truth’, whereas a truncated version testbed parametrization schemes. Several stochastic schemes were investigated, including additive multiplicative noise. forecasts started from perfect initial conditions, eliminating condition uncertainty. stochastically generated ensembles compared...
In this paper we present the second part of a study spherically-symmetric solutions Schrödinger-Newton equations for single particle (Penrose R 1998 Quantum computation, entanglement and state reduction Phil. Trans. R. Soc. 356 1-13). We show that there exists an infinite family normalizable, finite energy which are characterized by being smooth bounded all values radial coordinate. therefore provide analytical support our earlier numerical integrations (Moroz I M et al Spherically-symmetric...
Abstract Background: Voice disorders affect patients profoundly, and acoustic tools can potentially measure voice function objectively. Disordered sustained vowels exhibit wide-ranging phenomena, from nearly periodic to highly complex, aperiodic vibrations, increased "breathiness". Modelling surrogate data studies have shown significant nonlinear non-Gaussian random properties in these sounds. Nonetheless, existing are limited analysing voices displaying near periodicity, do not account for...
In 1979, Moffatt pointed out that the conventional treatment of simplest self-exciting homopolar disc dynamo has inconsistencies because neglect induced azimuthal eddy currents, which can be resolved by introducing a segmented dynamo. Here we return to simple system proposed Moffatt, and demonstrate previously unknown hidden chaotic attractors. Then study multistability coexistence three types attractors in autonomous dimensions: equilibrium points, limit cycles addition, existence two...
Abstract It is now acknowledged that representing model uncertainty in atmospheric simulators essential for the production of reliable probabilistic forecasts, and a number different techniques have been proposed this purpose. This paper presents new perturbed parameter schemes use European Centre Medium-Range Weather Forecasts (ECMWF) convection scheme. Two types scheme are developed implemented. Both represent joint four parameters parameterization scheme, which was estimated using...
In this paper we present a numerical study of the Schrödinger–Newton (SN) equations. We begin by considering linear stability spherically symmetric stationary solutions found numerically Moroz et al (1998 Class. Quantum Grav. 15 2733–42) and Bernstein Mod. Phys. Lett. A13 2327–36). The ground state, characterized as state lowest energy, turns out to be linearly stable, with only imaginary eigenvalues. (n+1)th is unstable having n quadruples complex eigenvalues (as well eigenvalues), where...
This paper reports a simple nonlinear approach to online acoustic speech pathology detection for automatic screening purposes. Straightforward linear preprocessing followed by two measures, based parsimoniously upon the biophysics of production, combined with subsequent classification, achieves an overall normal/pathological performance 91.4%, and over 99% rejection 15% ambiguous cases. compares favourably more complex, computationally intensive methods on large number other measures....
In this paper, we introduce an extended Sprott E system by a general quadratic control scheme with 3 arbitrary parameters for the new system. The resulting can exhibit codimension-one Hopf bifurcations as vary. strategy used be applied to create degenerate at desired locations preferred stability. A complex chaotic attractor only one stable equilibrium is derived in sense of having positive largest Lyapunov exponent. generated via period-doubling bifurcation. To further suppress chaos...
To understand the complex dynamics of Kingni–Jafari system with hidden attractors, first objective this paper is to study global dynamics, and give a complete description at infinity by using Poincaré compactification polynomial vector field in [Formula: see text]. The second prove existence periodic solutions classical Hopf bifurcation degenerate bifurcation. Moreover, based on averaging theory, small amplitude solution that bifurcates from zero-Hopf equilibrium was derived system....
The Stochastically Perturbed Parametrization Tendencies (SPPT) scheme is used at weather and climate forecasting centres worldwide to represent model uncertainty that arises from simplifications involved in the parametrization process. It uses spatio‐temporally correlated multiplicative noise perturb sum of parametrized tendencies. However, SPPT does not distinguish between different schemes, which do necessarily have same error characteristics. A generalization proposed, whereby tendency...
This paper proposes a novel neural adaptive fixed-time control approach for the attitude stabilization and vibration suppression of flexible spacecraft. First, network (NN) was introduced to identify lumped unknown term involving uncertain inertia, external disturbance, torque saturation, elastic vibrations. Then, proposed controller synthesized by embedding NN compensation into backstepping framework. Lyapunov analysis showed that guaranteed angular velocity adjustable small neighborhoods...