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KNOWM Memristors in a Bridge Synapse delay-based Reservoir Computing system for detection of epileptic seizures

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arXiv 2025年

作者： Przyczyna, Dawid Hess, Grzegorz Szacilowski, Konrad AGH University of Science and Technology Academic Centre for Materials and Nanotechnology al. Mickiewicza 30 Kraków30-059 Poland AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. Mickiewicza 30 Kraków30-059 Poland Jagiellonian University Department of Neurophysiology and Chronobiology Institute of Zoology and Biomedical Research ul. Gronostajowa 9 Kraków30-387 Poland

Nanodevices that show the potential for non-linear transformation of electrical signals and various forms of memory can be successfully used in new computational paradigms, such as neuromorphic or reservoir computing (RC). Dedicated hardware implementations based on functional neuromorphic structures significantly reduce energy consumption and/or increase computational capabilities of a given artificial neural network system. Concepts of RC, which as a flexible computational paradigm can be highly inclusive, are often used as a model to describe computations performed in materia. With mostly fixed internal structure, solid-state devices, especially memristors, are studied as computational substrates in various RC systems. In this work, we present single-node Echo State Machine (SNESM) RC system based on bridge synapse as a computational substrate (consisting of 4 memristors and a differential amplifier) used for epileptic seizure detection. KNOWM memristors were posed as ideal candidates because of their easy prototyping and reliability of operation. In this account, we present an application of commercially available KNOWM memristors in various neuromorphic applications, from simple analysis of switching and internal dynamics (elucidated form noise spectroscopy and total harmonic distortion analysis) to the classification and recognition of complex time series: epilepsy seizure recognition using a wrist-worn triaxial accelerometer. The results show that the evolution of the signal in a feedback loop helps improve the classification accuracy of the system for that task. The transformation in SNESM changes the correlation and distribution of the complexity parameters of the input signal. In general, there are more differences in the correlation of complexity parameters between the transformed signal and the input signal, which may explain the improvement in the classification scores. SNESM could prove to be a useful time series signal processing system designed to im

关键词： Differential amplifiers

Mixed state entanglement from symmetric matrix inequalities

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arXiv 2025年

作者： Rico, Albert Physics department Universitat Autònoma de Barcelona Bellaterra BarcelonaES-08193 Spain Faculty of Physics Astronomy and Applied Computer Science Institute of Theoretical Physics Jagiellonian University Kraków30-348 Poland

Recently, a toolkit of highly symmetric techniques employing matrix inequalities has been developed to detect entanglement in various ways. Here we concisely review these methods providing a unified framework, and expand them to a new family of positive maps with further detection capabilities. In the simplest case, we generalize the reduction map to detect more generic states using both multiple copies and local filters. Through the Choi-Jamiolkowski isomorphism, this family of maps leads to a construction of multipartite entanglement witnesses. Discussions and examples are provided regarding the detection of states with local positive partial transposition and the use of multiple copies. Copyright © 2025, The Authors. All rights reserved.

关键词： Quantum entanglement

Random model of flow decorrelation

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arXiv 2023年

作者： Bożek, Piotr Mehrabpour, Hadi AGH University of Krakow Faculty of Physics and Applied Computer Science al. Mickiewicza 30 Cracow30-059 Poland PRISMA+ Cluster of Excellence & Mainz Institute for Theoretical Physics Johannes Gutenberg-Universität Mainz Mainz55099 Germany

The collective flow generated in relativistic heavy-ion collisions fluctuates from event to event. The fluctuations lead to a decorrelation of flow vectors measured in separate bins in phase space. These effects have been measured in experiments and observed in numerical simulations in hydrodynamic models. We present a simple random model of flow decorrelation in pseudorapidity. Analytical expressions for the flow factorization breaking coefficients for flow vectors, flow vector magnitudes, and flow angles are derived. The model explains the relations between different factorization breaking coefficients found in experimental data and model simulations. In particular, it is found that the flow angle decorrelation constitutes about one half of the total flow vector decorrelation. © 2023, CC BY.

关键词： Factorization

Lévy flights and Lévy walks under stochastic resetting

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arXiv 2023年

作者： Zbik, Bartosz Dybiec, Bartlomiej 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

Stochastic resetting is a protocol of starting anew, which can be used to facilitate the escape kinetics. We demonstrate that restarting can accelerate the escape kinetics from a finite interval restricted by two absorbing boundaries also in the presence of heavy-tailed, Lévy type, α-stable noise. However, the width of the domain where resetting is beneficial depends on the value of the stability index α determining power-law decay of jump length distribution. For heavier (smaller α) distributions the domain becomes narrower in comparison to lighter tails. Additionally, we explore connections between Lévy flights and Lévy walks in presence of stochastic resetting. First of all, we show that for Lévy walks, the stochastic resetting can be beneficial also in the domain where coefficient of variation is smaller than 1. Moreover, we demonstrate that in the domain where LW are characterized by a finite mean jump duration/length, with the increasing width of the interval LW start to share similarities with LF under stochastic resetting. Copyright © 2023, The Authors. All rights reserved.

关键词： Stochastic systems

Magnetocaloric performance of RE5Pd2In4 (RE = Tb-Tm) compounds

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arXiv 2024年

作者： Hayyu, Altifani Rizky Baran, Stanislaw Szytula, Andrzej Jagiellonian University Doctoral School of Exact and Natural Sciences Faculty of Physics Astronomy and Applied Computer Science prof. Stanislawa Lojasiewicza 11 KrakówPL-30-348 Poland Jagiellonian University Faculty of Physics Astronomy and Applied Computer Science M. Smoluchowski Institute of Physics prof. Stanislawa Lojasiewicza 11 KrakówPL-30-348 Poland

Magnetocaloric performance of the RE5Pd2In4 (RE = Tb-Tm) rare earth compounds has been investigated using measurements of magnetization in the function of temperature and applied magnetic field. The maximum magnetic entropy change (−∆SMmax) at magnetic flux density change (∆µ0H) of 0-9 T has been determined to be 3.3 J·kg−1·K−1 at 62 K for Tb5Pd2In4, 7.0 J·kg−1·K−1 at 22 K for Dy5Pd2In4, 12.6 J·kg−1·K−1 at 22 K for Ho5Pd2In4, 12.1 J·kg−1·K−1 at 17 K for Er5Pd2In4 and 11.9 J·kg−1·K−1 at 9.0 K for Tm5Pd2In4. The temperature averaged entropy change (TEC) with 3 K span equals 3.2, 7.0, 12.6, 12.2 and 11.8 J·kg−1·K−1 for RE = Tb-Tm, respectively. The relative cooling power (RCP) and refrigerant capacity (RC) are equal to respectively 258 and 215 J·kg−1 in Tb5Pd2In4, 498 and 325 J·kg−1 in Dy5Pd2In4, 489 and 403 J·kg−1 in Ho5Pd2In4, 403 and 314 J·kg−1 in Er5Pd2In4 and 234 and 184 J·kg−1 in Tm5Pd2In4. The magnetocaloric properties of RE5Pd2In4 are comparable to those of other known magnetocaloric materials, which show good magnetocaloric performance at low temperatures. Among RE5Pd2In4, the highest values of parameters characterizing the magnetocaloric effect are found for RE = Ho and Er. Furthermore, for fixed RE element, the RE5Pd2In4 compound displays the highest RCP and RC values when compared to those of its isostructural RE5T2In4 (T = Ni, Pt) analogues. © 2024, CC BY.

关键词： Magnetocaloric effects

Models of Battle Dynamics in Strategic computer Games 16

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Models of Battle Dynamics in Strategic Computer Games

16th International Conference Management of Large-Scale System Development, MLSD 2023

作者： Laryushin, Ivan Dmitrievich Pashin, Dmitrii Sergeevich Koltochenko, Yaroslav Alekseevich Ereshko, Felix Ivanovich Gaponov-Grekhov Institute of Applied Physics Ras Plasma Physics Department Nizhny Novgorod Russia State University of Nizhny Novgorod Faculty of Physics National Research Lobachevsky Nizhny Novgorod Russia Moscow Institute of Physics and Technology Department of Mathematical Modeling of Complex Systems and Optimization Moscow Russia Federal Research Center 'Computer Science and Control' of the Ras Department of Information and Computing Systems Moscow Russia

ISBN: (纸本)9798350337907

A set of new models that describe the dynamics of battles in strategic computer games is presented. These models not only have descriptive functions, but also allow solving problems of optimizing army control under given conditions, as well as calculating the most efficient composition of the army for the planned operation within a computer game. © 2023 IEEE.

关键词： computer games

Insight into the structural and magnetotransport properties of epitaxial α−Fe2O3/Pt(111) heterostructures: Role of the reversed layer sequence

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Physical Review B 2022年第10期106卷 104419-104419页

作者： A. Kozioł-Rachwał N. Kwiatek W. Skowroński K. Grochot J. Kanak E. Madej K. Freindl J. Korecki N. Spiridis Faculty of Physics and Applied Computer Science AGH University of Science and Technology Mickiewicza 30 30-059 Kraków Poland Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences 30-239 Kraków Poland Institute of Electronics AGH University of Science and Technology Mickiewicza 30 30-059 Kraków Poland

We report on the chemical structure and spin Hall magnetoresistance (SMR) in epitaxial α−Fe2O3(hematite)(0001)/Pt(111) bilayers with hematite thicknesses of 6 and 15 nm grown by molecular beam epitaxy on a MgO(111) substrate. Unlike previous studies that involved Pt overlayers on hematite, the present hematite films were grown on a stable Pt buffer layer and displayed structural changes as a function of thickness. These structural differences (the presence of a ferrimagnetic phase in the thinner film) significantly affected the magnetotransport properties of the bilayers. We observed a sign change of the SMR from positive to negative when the thickness of the hematite increased from 6 to 15 nm. For α−Fe2O3(15nm)/Pt, we demonstrated room-temperature switching of the Néel order with rectangular, nondecaying switching characteristics. Such structures open the way to extending magnetotransport studies to more complex systems with double asymmetric metal/hematite/Pt interfaces.

关键词： Magnetic order Magnetotransport Spin Hall magnetoresistance Spintronics Antiferromagnets Epitaxy

EBSD and TKD analyses using inverted contrast Kikuchi diffraction patterns and alternative measurement geometries

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arXiv 2024年

作者： Cios, Grzegorz Winkelmann, Aimo Nolze, Gert Tokarski, Tomasz Jany, Benedykt R. Bala, Piotr Academic Centre for Materials and Nanotechnology AGH University of Krakow al. A. Mickiewicza 30 Krakow30-059 Poland Unter den Eichen 87 Berlin12205 Germany TU Bergakademie Freiberg Institute for Mineralogy Brennhausgasse 14 Freiberg09596 Germany Marian Smoluchowski Institute of Physics Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Krakow30348 Poland Faculty of Metals and Industrial Computer Science AGH University of Krakow al. A. Mickiewicza 30 Krakow30-059 Poland

Electron backscatter diffraction (EBSD) patterns can exhibit Kikuchi bands with inverted contrast due to anomalous absorption. This can be observed, for example, on samples with nanoscale topography, in case of a low tilt backscattering geometry, or for transmission Kikuchi diffraction (TKD) on thicker samples. Three examples are discussed where contrast-inverted physics-based simulated master patterns have been applied to find the correct crystal orientation. As first EBSD example, self-assembled gold nanostructures made of Au fcc and Au hcp phases on single-crystal germanium were investigated. Gold covered about 12% of the mapped area, with only two thirds being successfully interpreted using standard Hough-based indexing. The remaining third was solved by brute force indexing using a contrast-inverted master pattern. The second EBSD example deals with maps collected at a non-tilted surface instead of the commonly used 70◦ tilted one. As TKD example, a jet-polished foil made of duplex stainless steel 2205 was examined. The thin part close to the hole edge producing normal-contrast patterns were standard indexed. The areas of the foil that become thicker with increasing distance from the edge of the hole produce contrast-inverted patterns. They covered three times the evaluable area and were successfully processed using the contrast-inverted master pattern. In the last example, inverted patterns collected at a non-tiled sample were mathematically inverted to normal contrast, and Hough/Radon-based indexing was successfully applied. Copyright © 2024, The Authors. All rights reserved.

关键词： Single crystals

Advancing Manuscript Metadata: Work in Progress at the Jagiellonian University

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arXiv 2024年

作者： do Valle Miranda, Luiz Kutt, Krzysztof Nalepa, Grzegorz J. Jagiellonian Human-Centered AI Lab Mark Kac Center for Complex Systems Research Institute of Applied Computer Science Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University prof. Stanislawa Lojasiewicza 11 Kraków30-348 Poland

As part of ongoing research projects, three Jagiellonian University units—the Jagiellonian University Museum, the Jagiellonian University Archives, and the Jagiellonian Library—are collaborating to digitize cultural heritage documents, describe them in detail, and then integrate these descriptions into a linked data cloud. Achieving this goal requires, as a first step, the development of a metadata model that, on the one hand, complies with existing standards, on the other hand, allows interoperability with other systems, and on the third, captures all the elements of description established by the curators of the collections. In this paper, we present a report on the current status of the work, in which we outline the most important requirements for the data model under development and then make a detailed comparison with the two standards that are the most relevant from the point of view of collections: Europeana Data Model used in Europeana and Encoded Archival Description used in Kalliope. Copyright © 2024, The Authors. All rights reserved.

关键词： Metadata