Article
Automation & Control Systems
Magdi S. Mahmoud, Muhammad Maaruf
Summary: This study proposes an output feedback synchronisation control method for uncertain bilateral teleoperation systems, addressing control issues through output error transformation, prescribed-performance functions, neural networks, etc., and verifies the effectiveness of the method through simulation results.
INTERNATIONAL JOURNAL OF SYSTEMS SCIENCE
(2021)
Article
Engineering, Mechanical
Aabhas Singh, Matthew S. Allen, Robert J. Kuether
Summary: This study explores the use of quasi-static analysis to model and predict the behavior of nonlinear joints and the frequency and damping of modes in structures. By applying quasi-static forces to multiple modes simultaneously and analyzing the load-displacement curves, the effect of other modes on the frequency and damping of the mode in question can be deduced. The results show that the quasi-static approach produces reasonable predictions of the nonlinear behavior, although they are conservative.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Mathematics, Interdisciplinary Applications
Kenshi Sakai, Patrick H. Brown, Todd S. Rosenstock, Shrinivasa K. Upadhyaya, Alan Hastings
Summary: The collective dynamics of chaotic oscillators in various fields, including agriculture and forestry, have attracted significant attention. The strong synchronization among trees in an orchard, which is a major problem in fruit growing, has been investigated in this study. Through the analysis of yield data and the establishment of a network model for pistachio population, this study reveals the phase transitions, mode-locking, and spatial correlation in the orchard, and elucidates the mechanisms of synchronization. The proposed methodology based on nonlinear dynamics is of great importance in the fields of pomology, forestry, and ecosystem management.
CHAOS SOLITONS & FRACTALS
(2022)
Article
Optics
Shifei Zhang, Lingling Huang, Guangzhou Geng, Junjie Li, Xiaowei Li, Yongtian Wang
Summary: This article introduces the technology of using dielectric metasurfaces for polarization multiplexing, which can achieve flexible polarization transformation and complex optical encryption, and is expected to be widely used in smart compact devices.
PHOTONICS RESEARCH
(2022)
Article
Green & Sustainable Science & Technology
Lu Liu, Xuelai Zhang, Xiangwei Lin
Summary: This study addresses the issue of phase change hysteresis (PCH) by preparing a nanocomposite phase change material (NCPCM) based on paraffin (PA), which utilizes multi-walled carbon nanotubes (MWCNTs) and sodium dodecylbenzene sulfonate (SDBS) to enhance thermal conductivity and suspension stability. The results show that the thermal conductivity of NCPCM with 1.0 wt% MWCNTs and a 2:1 mass ratio of MWCNTs and SDBS increased by 1.86 times. Moreover, the NCPCM exhibits high thermal charging-discharging efficiency, thermal stability, and cyclic stability. The study also investigates the effects of temperature range, temperature changing rate, and sample mass on the hysteresis degree of PCH.
Article
Automation & Control Systems
Marco Augusto Vasquez-Beltran, Bayu Jayawardhana, Reynier F. Peletier
Summary: In this work, we studied a class of Duhem hysteresis operators that can exhibit butterfly loops. We first investigated the consistency property of such operators, which corresponds to the existence of an attractive periodic solution under a periodic input signal. We then studied the two defining functions of the Duhem operator to allow corresponding periodic solutions to have a butterfly input-output phase plot. Several examples were presented where Duhem butterfly hysteresis operators were constructed using two zero-level set curves that satisfy certain mild conditions.
IEEE TRANSACTIONS ON AUTOMATIC CONTROL
(2023)
Article
Optics
Aun Zaidi, Noah A. Rubin, Ahmed H. Dorrah, Joon-Suh Park, Federico Capasso
Summary: Metasurfaces were used to design a novel polarization transformation device without relying on traditional polarization components, showing promising applications in various fields.
Article
Computer Science, Cybernetics
Takashi G. Sato, Yuuki Ooishi, Masahiro Fujino, Takehiro Moriya
Summary: This study investigated the phasic relationship between melodic sound and respiration (PRSR) and successfully controlled the PRSR using a device. By setting the template of the respiration pattern, researchers were able to coordinate the phase relationship between music and respiration. The experiment showed that different phasic relationships significantly affected the respiration rate, indicating the researchers' effective control of PRSR. These findings are important for future digital emotion regulation.
BEHAVIOUR & INFORMATION TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Ivan Dario Gomez Araujo
Summary: Transmissibility-based operational modal analysis (TOMA) is a rapidly developing research area that utilizes response transmissibility and power spectrum density transmissibility functions to estimate modal parameters of structures. This study proposes a unified concept that relates scalar response transmissibility and power spectrum density transmissibility functions, enabling modal parameter identification under different load conditions.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Chemistry, Multidisciplinary
Paolo Casini, Fabrizio Vestroni
Summary: This paper investigates the nonlinear modal interactions in the dynamic response of a two-degree-of-freedom system with hysteretic elements. The results show that under internal resonance conditions, these nonlinear phenomena can significantly reduce the response amplitude and achieve vibration mitigation.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Multidisciplinary
Shunsuke Nakamura, Momoka Yamanaka, Yushi Oishi, Takayuki Narita
Summary: This study demonstrates the achievement of light-driven self-oscillation by utilizing the thermosensitive properties of hydrogels, providing a potential solution for the development of carbon-emission-free autonomous transmission pumps and self-swimming micromotors.
Article
Engineering, Electrical & Electronic
Xicong Li, Zabih Ghassemlooy, Stanislav Zvanovec, Luis Nero Alves, Monica Figueiredo, Min Zhang, Sreelal Maravanchery Mana, Volker Jungnickel, Petr Chvojka
Summary: This paper proposes a full-digital architecture for a practical carrier-less amplitude and phase (CAP) receiver for visible light communication (VLC). The proposed receiver utilizes two digital phase-locked loops (DPLL) for symbol timing and carrier synchronisation, and employs the constant-modulus algorithm (CMA) for blind equalisation. Simulation results show that the receiver architecture can successfully solve signal distortion and inter-symbol interference problems.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Astronomy & Astrophysics
Jose R. Espinosa, Ryusuke Jinno, Thomas Konstandin
Summary: A new formulation for obtaining the tunneling action for vacuum decay based on the tunneling potential was recently developed. The new action was derived by requiring its variation to lead to the correct equations of motion and the same value for the action as evaluated on the Euclidean bounce. An alternative derivation of the tunneling potential action via canonical transformations is presented, discussing single-field, multi-field, and gravity cases. The possible application of the new approach to the calculation of the functional determinant prefactor in the tunneling rate is also commented on.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Mahendaran Uchimali
Summary: The study utilizes the CPD model to examine the effect of stress on the thermal hysteresis of SMA, showing a decrease in hysteresis with increased stress due to the force required to propagate the ledges along the twin or phase boundary.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2021)
Article
Chemistry, Physical
Mingxuan Lin, Carina Zimmermann, Kai Wang, Martin Hunkel, Ulrich Prahl, Robert Spatschek
Summary: The study focused on the kinetics of bainitic transformations in 22MnB5 under different stresses, analyzing the variant selection effect and developing autocatalytic transformation and phase field models to describe the coupling processes during bainitic transformations.
Article
Physics, Multidisciplinary
Diego Pazo, Ernest Montbrio, Rafael Gallego
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2019)
Article
Mathematics, Applied
Diego Pazo, Rafael Gallego
Article
Multidisciplinary Sciences
Catharina E. Graafland, Jose M. Gutierrez, Juan M. Lopez, Diego Pazo, Miguel A. Rodriguez
SCIENTIFIC REPORTS
(2020)
Editorial Material
Mathematics, Applied
Diego Pazo, Rafael Gallego
Summary: In this study, an extension of the Winfree model with nonlinear interactions was analyzed. The nonlinear coupling function Q was mistakenly identified with the non-infinitesimal phase-response curve (PRC). Numerical simulations were used to compute the PRCs corresponding to the Q functions, confirming a qualitative similarity between PRC and the coupling function Q in all cases.
Article
Physics, Multidisciplinary
Ernest Montbrio, Diego Pazo
PHYSICAL REVIEW LETTERS
(2020)
Article
Mathematics, Applied
Pau Clusella, Bastian Pietras, Ernest Montbrio
Summary: Researchers derive a Kuramoto model corresponding to a weakly coupled population of nearly identical quadratic integrate-and-fire neurons with both electrical and chemical coupling. They find that the ratio of chemical to electrical coupling critically determines the synchronization properties of the network. They also demonstrate that the presence of both electrical and chemical coupling is necessary for chimera states to exist.
Article
Mathematics, Applied
Ivan Leon, Diego Pazo
Summary: This study demonstrates the usefulness of a moment-based scheme in reproducing the dynamics of infinitely many oscillators. It analyzes Gaussian heterogeneities and tests the effects of truncating the moment system and implementing different closures in the Kuramoto model. The moment-based approach proves to be more efficient than direct simulation of a large oscillator ensemble.
Article
Neurosciences
Yonatan Sanz Perl, Gorka Zamora-Lopez, Ernest Montbrio, Marti Monge-Asensio, Jakub Vohryzek, Sol Fittipaldi, Cecilia Gonzalez Campo, Sebastian Moguilner, Agustin Ibanez, Enzo Tagliazucchi, B. T. Thomas Yeo, Morten L. Kringelbach, Gustavo Deco
Summary: The role of heterogeneities in brain dynamics, specifically in synchronous behavior, is explored using computational models. Models with oscillations better reproduce empirical properties when considering both structural and functional regional heterogeneities.
NETWORK NEUROSCIENCE
(2023)
Article
Physics, Fluids & Plasmas
Ivan Leon, Diego Pazo
Summary: The emergence of collective synchrony from an incoherent state is described by the Kuramoto model, which needs to be extended to quadratic order for comprehensive analysis. The extended model exhibits complex phenomena, such as secondary instability and collective chaos, at certain parameter values.
Article
Physics, Fluids & Plasmas
David Velasco, Juan M. Lopez, Diego Pazo
Summary: Globally coupled maps (GCMs) are prototypical examples of high-dimensional dynamical systems where an ensemble of weakly coupled identical chaotic units form GCMs typically exhibit hyperchaotic turbulent state. Recent study shows that in turbulent GCMs with positive multipliers, the largest Lyapunov exponent (LE) does not follow the logarithmic relationship as previously predicted, but follows a power-law scaling instead.
Article
Physics, Fluids & Plasmas
Ivan Leon, Diego Pazo
Article
Physics, Fluids & Plasmas
Bastian Pietras, Federico Devalle, Alex Roxin, Andreas Daffertshofer, Ernest Montbrio
Article
Physics, Fluids & Plasmas
Ivan Leon, Diego Pazo
