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arXiv 2023年

作者： Pogorzelec, Przemyslaw Dybiec, Bartlomiej Doctoral School of Exact and Natural Sciences Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Lojasiewicza 11 Kraków30-348 Poland Institute of Theoretical Physics Mark Kac Center for Complex Systems Research Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Lojasiewicza 11 Kraków30-348 Poland

Properties of stochastic systems are defined by the noise type and deterministic forces acting on the system. In out-of-equilibrium setups, e.g., for motions under action of Lévy noises, the existence of the stationary state is not only determined by the potential but also by the noise. Potential wells need to be steeper than parabolic in order to assure existence of stationary states. The existence of stationary states, in sub-harmonic potential wells, can be restored by stochastic resetting, which is the protocol of starting over at random times. Herein we demonstrate that the combined action of Lévy noise and Poissonian stochastic resetting can result in the phase transition between non-equilibrium stationary states of various multimodality in the overdamped system in super-harmonic potentials. Fine-tuned resetting rates can increase the modality of stationary states, while for high resetting rates the multimodality is destroyed as the stochastic resetting limits the spread of particles. © 2023, CC BY.

关键词： Stochastic systems

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Deep-learning-based identification of individual motion characteristics from upper-limb trajectories towards disorder stage evaluation

arXiv

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arXiv 2024年

作者： Sziburis, Tim Blex, Susanne Glasmachers, Tobias Iossifidis, Ioannis Ruhr University Bochum Bochum Germany Institute of Computer Science Ruhr West University of Applied Sciences Mülheim an der Ruhr Germany Faculty of Physics and Astronomy Ruhr University Bochum Germany

The identification of individual movement characteristics sets the foundation for the assessment of personal rehabilitation progress and can provide diagnostic information on levels and stages of movement disorders. This work presents a preliminary study for differentiating individual motion patterns using a dataset of 3D upper-limb transport trajectories measured in task-space. Identifying individuals by deep time series learning can be a key step to abstracting individual motion properties. In this study, a classification accuracy of about 95 % is reached for a subset of nine, and about 78 % for the full set of 31 individuals. This provides insights into the separability of patient attributes by exerting a simple standardized task to be transferred to portable systems. Copyright © 2024, The Authors. All rights reserved.

关键词： Deep learning

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Miniaturization of Dimensions Based on Square Loop Resonator with NP Fractal Model for Sensor Applications

Miniaturization of Dimensions Based on Square Loop Resonator...

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13th International Electrical Engineering Congress, iEECON 2025

作者： Nantapanich, Nutyada Wongsin, Norakamon Tangthong, Nipont Rakluea, Chawalit Rakluea, Paitoon Chanwattanapong, Wanchalerm Chudpooti, Nonchanutt Mahatthanajatuphat, Chatree Rajamangala University of Technology Faculty of Engineering Department of Electronics and Telecommunication Engineering Thanyaburi12110 Thailand King Mongkut's University of Technology North Bangkok Faculty of Applied Science Department of Industrial Physics and Medical Instrumentation Bangkok10800 Thailand King Mongkut's University of Technology North Bangkok Faculty of Engineering Department of Electrical and Computer Engineering Bangkok10800 Thailand

ISBN: (纸本)9798331543952

This paper proposes a reduction in the dimensions of a square loop resonator via the utilization of fractal techniques. The 2nd order NP fractal model is investigated to minimize the dimensions of the square loop resonator. The suggested fractal resonator is indirectly fed via the coupling line encircling the resonator to enhance impedance matching. The suggested fractal resonator has a frequency response of 2.936 GHz, with |S11| and |S21| evaluated at -16.17 dB and -2.09 dB, respectively. The dimensions of the suggested fractal resonator are 10.5×10.5 mm2, representing a reduction of roughly 56.9% compared to the square loop resonator. Consequently, the suggested fractal resonator may serve as a sensor for the measuring instrument. © 2025 IEEE.

关键词： Fractal dimension

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Digital Twin Data Management: A Comprehensive Review

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IEEE Transactions on Big Data 2025年

作者： Ouedraogo, Ezekiel B. Hawbani, Ammar Wang, Xingfu Liu, Zhi Zhao, Liang Al-Qaness, Mohammed A. A. Alsamhi, Saeed Hamood University of Science and Technology of China School of Computer Science and Technology Hefei230027 China Shenyang Aerospace University School of Computer Science Shenyang110136 China The University of Electro-Communications Tokyo Japan Zhejiang Normal University College of Physics and Electronic Information Engineering Jinhua321004 China Zhejiang Institute of Optoelectronics Jinhua321004 China University of Galway Insight centre for data analytics Ireland IBB University Ibb Faculty of Engineering Yemen Yemen

Digital Twins are virtual representations of physical assets and systems that rely on effective Data Management to integrate, process, and analyze diverse data sources. This article comprehensively examines Data Management challenges, architectures, techniques, and applications in the context of Digital Twins. It explores key issues such as data heterogeneity, quality assurance, scalability, security, and interoperability. The paper outlines architectural approaches like centralized, distributed, cloud-based, and blockchain solutions and Data Management techniques for modeling, integration, fusion, quality management, and visualization. Domain-specific considerations across manufacturing, smart cities, healthcare, and other sectors are discussed. Finally, open research challenges related to standards, real-time data processing, intelligent Data Management, and ethical aspects are highlighted. By synthesizing the state-of-the-art, this review serves as a valuable reference for developing robust Data Management strategies that enable Digital Twin deployments. © 2015 IEEE.

关键词： Data quality

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Accumulation of selected heavy metals in a sediment sample on the example of Lake Bagry (Poland): Modelling studies

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science of the Total Environment 2025年 983卷 179650页

作者： Bielski, Andrzej Prus, Zuzanna Faculty of Environmental Engineering and Energy Cracow University of Technology Warszawska St. 24 Cracow31-155 Poland Faculty of Metals Engineering and Industrial Computer Science AGH University of Krakow Mickiewicza Av. 30 Cracow30-059 Poland

The presence of heavy metals (HMs) in aquatic environments poses significant environmental risks due to their persistence, toxic properties, and potential for bioaccumulation in organisms. Their increased concentrations are found in many water bodies, especially post-mining lakes such as Bagry Lake in Cracow. This paper presents the modelling study on the adsorption of Cu, Pb, Zn, Cd, and Co in the bottom sediment of Bagry Lake, considering the temperature effect and the type of fraction (mineral and volatile). The HM concentrations from the clay-silty fraction ( © 2025 Elsevier B.V.

关键词： Inductively coupled plasma mass spectrometry

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Dynamical Dark Energy in Minimally Modified Gravity

arXiv

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arXiv 2022年

作者： Ganz, Alexander Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Krakow30-348 Poland

Minimally modified gravity is a class of models with only the two tensor degrees of freedom as in general relativity. Using the framework with auxiliary constraints these models can maintain a dynamical cosmological background. The form of the constraints is thereby restricted by the requirement of dynamical dark energy and the avoidance of a breakdown of perturbation theory. Studying the linear perturbations around the FLRW background the results are, however, quite insensitive to the details of the constraints leading to a modified effective gravitational constant or a non-vanishing sound speed for dust. Copyright © 2022, The Authors. All rights reserved.

关键词： Degrees of freedom (mechanics)

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A Reliable Method to Estimate the Bispectral Index Value Using a Single Frontal EEG Channel for Intra and Inter Subject Variability

A Reliable Method to Estimate the Bispectral Index Value Usi...

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2023 IEEE International Symposium on Medical Measurements and Applications, MeMeA 2023

作者： Shahbakhti, Mohammad Beiramvand, Matin Krycinska, Roza Nasiri, Erfan Chen, Wei Sole-Casals, Jordi Wierzchon, Michal Broniec-Wojcik, Anna Augustyniak, Piotr Marozas, Vaidotas Biomedical Engineering Institute Kaunas University of Technology Kaunas Lithuania Tampere University Faculty of Information Technology and Communication Tempere Finland Jagiellonian University Medical College Doctoral School in Medical and Health Sciences Krakow Poland Jagiellonian University Collegium Medicum Department of Interdisciplinary Intensive Care Krakow Poland Allameh Tabataba'i University Faculty of Statistics Mathematics and Computer Tehran Iran Fudan University Center for Intelligent Medical Electronics School of Information Science and Technology Shanghai China University of Vic-Central University of Catalonia Data and Signal Processing Research Group Vic Spain Institute of Psychology Jagiellonian University Krakow Poland Agh University of Science and Technology Department of Biocybernetics and Biomedical Engineering Krakow Poland

ISBN: (纸本)9781665493840

Objective: Monitoring the depth of anesthesia (DoA) plays an important role for administering the drug injection during a surgery, i.e., preventing undesired awareness and inordinate anesthetic depth. Although the bispectral index (BIS) monitor is the golden standard system for the DoA monitoring, it is still not affordable for the developing countries. Alternatively, a low-cost electroencephalogram (EEG) headband can be used. The objective of this paper is to present a new algorithm for estimating the BIS values using a single frontal EEG channel. Method: In the first step, the EEG signal is filtered for the elimination of artifacts and is split into its sub-bands. In the second step, several linear and nonlinear features are extracted from each sub-band and fed to a random forest regression model in order to estimate the BIS. The performance of the proposed algorithm is assessed using EEG data recorded from twenty-four subjects during the general anesthesia and is validated in terms of correlation coefficient (CC) and absolute error (AE) between the reference and estimated BIS values. Results: The proposed algorithm achieved the mean CC of 0.83 and AE of 6.5 for intra subject variability and mean CC of 0.87 and AE of 5.5 for inter subject variability. Significance: Given the similar results for both intra and inter subject variability, the proposed algorithm has the potential to be used in the real-world scenario. © 2023 IEEE.

关键词： Electroencephalography

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Temperature-anisotropy conjugate magnon squeezing in antiferromagnets

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Physical Review B 2023年第14期108卷 144302-144302页

作者： Mahroo Shiranzaei Jonas Fransson Vahid Azimi Mousolou Division of Materials Theory Department of Physics and Astronomy Uppsala University Box 516 SE-75120 Uppsala Sweden Department of Applied Mathematics and Computer Science Faculty of Mathematics and Statistics University of Isfahan Isfahan 81746-73441 Iran

Quantum squeezing is an essential asset in the field of quantum science and technology. In this paper, we investigate the impact of temperature and anisotropy on squeezing of quantum fluctuations in two-mode magnon states within uniaxial antiferromagnetic materials. Through our analysis, we discover that the inherent nonlinearity in these bipartite magnon systems gives rise to a conjugate magnon squeezing effect across all energy eigenbasis states, driven by temperature and anisotropy. We show that temperature induces amplitude squeezing, whereas anisotropy leads to phase squeezing. In addition, we observe that the two-mode squeezing characteristic of magnon eigenenergy states is associated with amplitude squeezing. This highlights the constructive impact of temperature and the destructive impact of anisotropy on two-mode magnon squeezing. Nonetheless, our analysis shows that the destructive effect of anisotropy is bounded. We demonstrate this by showing that, at a given temperature, the squeezing of the momentum (phase) quadrature [or equivalently, the stretching of the position (amplitude) quadrature] approaches a constant function of anisotropy after a finite value of anisotropy. Moreover, our paper demonstrates that higher magnon squeeze factors can be achieved at higher temperatures, smaller levels of anisotropy, and closer to the Brillouin zone center. All these characteristics are specific to low-energy magnons in the uniaxial antiferromagnetic materials that we examine here.

关键词： Magnons Quantum correlations in quantum information Quantum information processing with continuous variables Quantum information theory Quantum metrology Spin dynamics Spintronics Temperature

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A Novel Electrospun Carbon Fiber Nanomats Modified with Co/Ni Phase for Highly-Efficient Electromagnetic Interference Shielding

SSRN

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SSRN 2024年

作者： Sokolowski, Krystian Lachowicz, Dorota Zambrzycki, Marcel Lapinska, Anna Sikora, Marcin Wielowski, Ryszard Jeleń, Piotr Bernasik, Andrzej Academic Centre for Materials and Nanotechnology AGH University of Krakow al. A. Mickiewicza 30 Krakow30-059 Poland Faculty of Materials Science and Ceramics AGH University of Krakow al. A. Mickiewicza 30 Krakow30-059 Poland Faculty of Physics Warsaw University of Technology Ul. Koszykowa 75 Warsaw00-662 Poland National Synchrotron Radiation Centre Solaris Jagiellonian University Ul. Czerwone Maki 98 Krakow30-392 Poland Faculty of Physics and Applied Science AGH University of Krakow al. A. Mickiewicza 30 Krakow30-059 Poland

This study aimed to produce a composite mat made of carbon nanofibers (CNFs) and CoNi-based nanofillers with the highest electromagnetic interference shielding efficiency (EMI SE) covering the 2-13.5 GHz range with controllable electrical and magnetic properties. The CoNi-phase fiber nanocomposite was formed by electrospinning and heat treatment of polyacrylonitrile fibers containing an organometallic precursor in the form of metallic acetylacetonates (Me(Acac)) up to 4.5 wt%. The best EMI properties of the mat were found through a comprehensive study of the correlation between metal precursor concentration and CoNi dispersion quality/composition, CNF structure, EMI SE, magnetization, and conductivity. It was found that even a small concentration of Me-based particles significantly improved the EMI SE from 25.3 dB to 56.7 dB in the 5 GHz band at a sample thickness of 50 µm. The highest EMI SE, conductivity and magnetization values were obtained for samples with 3 wt% Acac. At higher concentrations of Me(Acac), the saturation effect of EMI was inhibited due to the degradation of the integrity of the individual CNFs in the sample, the greater susceptibility of CoNi to oxidation and the loss of nanoparticles from the material. The shielding mechanism of the CNF/CoNi composites was mainly through absorption. © 2024, The Authors. All rights reserved.

关键词： Carbon nanofibers

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Dopant ions size impact on structural properties of ordered poly(3,4-ethylenedioxythiophene) systems

Dopant ions size impact on structural properties of ordered ...

引用

作者： Şniechowski, Maciej Kozik, Tomasz A. Luzny, Wojciech Faculty of Physics and Applied Computer Science AGH University of Science and Technology Al. Mickiewicza 30 Cracow30-059 Poland

The purpose of this work was to determine whether the structures of ordered part of novel poly(3,4-ethylenedioxythiophene) PEDOT : OTf (doped with trifluoromethanesulfonate anions) and PEDOT : HSulf (doped with hydrogensulfate anions) systems could really be simply the layered structure of PEDOT : Tos (doped with tosylate anions) with the counter ion changed to the appropriate one. Insight into this problem could be provided by molecular dynamics simulations but also by swarm intelligence optimization, developed earlier for the purpose of investigating the other structures. © 2020 Industrial Chemistry Research Institute. All rights reserved.

关键词： Sulfur compounds

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