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arXiv 2024年

作者： Jakubowski, Jakub Wojak-Strzelecka, Natalia Ribeiro, Rita P. Pashami, Sepideh Bobek, Szymon Gama, João Nalepa, Grzegorz J. Department of Applied Computer Science AGH University of Science and Technology al. Adama Mickiewicza 30 Kraków30-059 Poland ArcelorMittal Poland al. Józefa Pilsudskiego 92 Dabrowa Gornicza41-308 Poland Mark Kac Center for Complex Systems Research ul. prof. Stanislawa Lojasiewicza 11 Kraków30-348 Poland RISE Research Institutes of Sweden Sweden Center for Applied Intelligent Systems Research Halmstad University Halmstad Sweden INESC TEC. Porto4200-465 Portugal Faculty of Sciences University of Porto Porto4200-465 Portugal Faculty of Economics University of Porto Porto4200-465 Portugal

Predictive Maintenance (PdM) emerged as one of the pillars of Industry 4.0, and became crucial for enhancing operational efficiency, allowing to minimize downtime, extend lifespan of equipment, and prevent failures. A wide range of PdM tasks can be performed using Artificial Intelligence (AI) methods, which often use data generated from industrial sensors. The steel industry, which is an important branch of the global economy, is one of the potential beneficiaries of this trend, given its large environmental footprint, the globalized nature of the market, and the demanding working conditions. This survey synthesizes the current state of knowledge in the field of AI-based PdM within the steel industry and is addressed to researchers and practitioners. We identified 219 articles related to this topic and formulated five research questions, allowing us to gain a global perspective on current trends and the main research gaps. We examined equipment and facilities subjected to PdM, determined common PdM approaches, and identified trends in the AI methods used to develop these solutions. We explored the characteristics of the data used in the surveyed articles and assessed the practical implications of the research presented there. Most of the research focuses on the blast furnace or hot rolling, using data from industrial sensors. Current trends show increasing interest in the domain, especially in the use of deep learning. The main challenges include implementing the proposed methods in a production environment, incorporating them into maintenance plans, and enhancing the accessibility and reproducibility of the research. Copyright © 2024, The Authors. All rights reserved.

关键词： Hot rolling

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Formation of grid patterns in an ac-driven electroconvection system

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Physical Review E 2020年第6期101卷 062701-062701页

作者： Jong-Hoon Huh Haruki Osoguchi Department of Physics and Information Technology Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Fukuoka 820-8502 Japan

We report the formation mechanism of a unique pattern observed in ac-driven electroconvection of nematic liquid crystals (NLCs), in which many well-organized grid cells are very regularly aggregated in a two-dimensional plane, globally forming a nearly perfect grid pattern (GP). Intuitively, the formation of such a pattern is unpredictable; usually, the perfectly regular normal roll (NR) showing a preferred roll direction is observed in this system by imposing a fixed initial direction of an NLC. The GP was investigated by varying the ac voltage and frequency. To characterize the GP, the density ρGP, the width a and length b of the grids, and the oscillation period TGP of an inner optical pattern of the grids were measured; moreover, the lengths L¯x and L¯y characterizing phase-jump lines (PJLs) in the GP were examined. By taking into account the process of evolution from a fluctuating NR with defects to the GP, the velocity and director fields of the GP are estimated. Furthermore, in comparison with the bimodal mechanism proposed in the earlier study, a possible mechanism for the GP formed by the PJLs is discussed; various routes to GPs depending on the ac frequency are proposed.

关键词： Convection Dissipative dynamics Pattern formation Phase diagrams Liquid crystals

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Josephson junction based on high critical-temperature superconductors: analysis, microcontroller implementation, and suppression of coexisting and chaotic attractors

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The European Physical Journal B 2022年第9期95卷 1-13页

作者： Ngongiah, Isidore Komofor Ramakrishnan, Balamurali Natiq, Hayder Pone, Justin Roger Mboupda Kuiate, Gaetan Fautso Department of Physics Faculty of Science University of Bamenda Bamenda Cameroon Center for Nonlinear Systems Chennai Institute of Technology Chennai India Information Technology College Imam Ja’afar Al-Sadiq University Baghdad Iraq Research Unit of Automation and Applied Computer (RUAIA) Electrical Engineering Department of IUT-FV University of Dschang Bandjoun Cameroon Department of Physics Higher Teacher Training College University of Bamenda Bamenda Cameroon Department of Mechanical and Industrial Engineering National Higher Polytechnic Institute University of Bamenda Bamenda Cameroon

A Josephson junction (JJ) based on high critical-temperature superconductors described by a linear resistive–capacitive–inductance shunted junction (LRCLSJ) model with unharmonic current-phase relation (UCPR) is theoretically and experimentally investigated in this paper. The numerical simulations indicate that JJ based on high critical-temperature superconductors exhibits excitable mode, regular spiking, periodic bursting, relaxation oscillations, chaotic attractors, and coexisting attractors. The theoretical investigations are verified experimentally through the microcontroller implementation. In addition, the coexistence between chaotic and limit cycle attractors found in JJ based on high critical-temperature superconductors is controlled to the desired trajectory using the linear augmentation control method. Finally, analytical calculations and numerical simulations are carried out to show the serviceableness of the two designed single controllers in suppressing chaos in JJ based on high critical-temperature superconductors.

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Fabrication and characterization of heavily doped n-type GaAs for mid-infrared plasmonics

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Journal of applied physics 2023年第9期134卷

作者： Duan, Juanmei Liedke, Maciej O. Dawidowski, Wojciech Li, Rang Butterling, Maik Hirschmann, Eric Wagner, Andreas Wang, Mao Young, Lawrence Boyu Lin, Yen-Hsun Glen Hong, Minghwei Helm, Manfred Zhou, Shengqiang Prucnal, Slawomir Helmholtz-Zentrum Dresden-Rossendorf Institute of Ion Beam Physics and Materials Research Bautzner Landstrasse 400 DresdenD-01328 Germany TU Dresden Dresden01062 Germany Helmholtz-Zentrum Dresden-Rossendorf Institute of Radiation Physics Bautzner Landstrasse 400 DresdenD-01328 Germany Wroclaw University of Science and Technology Faculty of Electronics Photonics and Microsystems Janiszewskiego 11/17 Wroclaw50-372 Poland Graduate Institute of Applied Physics Department of Physics National Taiwan University Taipei10617 Taiwan

N-type doping in GaAs is a self-limited process, rarely exceeding a carrier concentration level of 1019 cm−3. Here, we investigated the effect of intense pulsed light melting on defect distribution and activation efficiency in chalcogenide-implanted GaAs by means of positron annihilation spectroscopy and electrochemical capacitance-voltage techniques. In chalcogenide-doped GaAs, donor-vacancy clusters are mainly responsible for donor deactivation. Using positrons as a probe of atomic scale open volumes and DFT calculations, we have shown that after nanosecond pulsed light melting the main defects in heavily doped GaAs are gallium vacancies decorated with chalcogenide atoms substituting As, like VGa-nTeAs or VGa-nSAs. The distribution of defects and carriers in annealed GaAs follows the depth distribution of implanted elements before annealing and depends on the change in the solidification velocity during recrystallization. © 2023 Author(s).

关键词： Gallium arsenide

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Tailoring the energy landscape of a Bloch point singularity with curvature

arXiv

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arXiv 2024年

作者： Ruiz-Gomez, Sandra Abert, Claas Morales-Fernández, Pamela Fernandez-Gonzalez, Claudia Koraltan, Sabri Danesi, Lukas Suess, Dieter Foerster, Michael Nino, Miguel Ángel Mandziak, Anna Wilgocka-Ślęzak, Dorota Nita, Pawel Koenig, Markus Seifert, Sebastian Rodríguez, Aurelio Hierro Fernández-Pacheco, Amalio Donnelly, Claire Max Planck Institute for Chemical Physics of Solids Dresden01187 Germany Faculty of Physics University of Vienna Vienna1010 Austria Research Platform MMM Mathematics-Magnetism-Materials University of Vienna Vienna1010 Austria ALBA Synchrotron Light Source CELLS Cerdanyola del Valles Barcelona08290 Spain Vienna Doctoral School in Physics University of Vienna Vienna Austria SOLARIS Synchrotron light Sources Crakow30-392 Poland Jerzy Haber Institute of Catalysis and Surface Chemistry PAC Krakow30-239 Poland Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Crakow30-348 Poland Depto. Física Universidad de Oviedo Oviedo33007 Spain Institute of Applied Physics TU Wien Wiedner Hauptstr. 8-10/134 Vienna1040 Austria Hiroshima University Hiroshima739-8526 Japan

Topological defects, or singularities, play a key role in the statics and dynamics of complex systems. In magnetism, Bloch point singularities represent point defects that mediate the nucleation of textures such as skyrmions and hopfions. However, while the textures are typically stabilised in chiral magnets, the influence of chirality on the Bloch point singularities remains relatively unexplored. Here we harness advanced three-dimensional nanofabrication to explore the influence of chirality on Bloch point singularities by introducing curvature-induced symmetry breaking in a ferromagnetic nanowire. Combining X-ray magnetic microscopy with the application of in situ magnetic fields, we demonstrate that Bloch point singularity-containing domain walls are stabilised in straight regions of the sample, and determine that curvature can be used to tune the energy landscape of the Bloch points. Not only are we able to pattern pinning points but, by controlling the gradient of curvature, we define asymmetric potential wells to realise a robust Bloch point shift-register with non-reciprocal behaviour. These insights into the influence of symmetry and chirality on singularities offers a route to the controlled nucleation and propagation of topological textures, providing opportunities for logic and computing devices. Copyright © 2024, The Authors. All rights reserved.

关键词： Nucleation

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In vitro antimicrobial and anticancer potentials of green synthesized luminescent carbon quantum dots derived from artichoke leaves

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Scientific Reports 2025年第1期15卷 1-21页

作者： Diab, Eman Abo Ghali, M. Mosaad, M.M. Physics Department Faculty of Science Kafrelsheikh University Kafr El-Sheikh 33516 Egypt Institute of Basic and Applied Sciences Egypt-Japan University of Science and Technology New Borg Al-Arab Alexandria 21934 Egypt

Naturally derived carbon quantum dots (CQDs) are novel carbon-based nanomaterials with excellent traits. It is highly demanded to develop CQDs from biowaste that have excellent photostability, a simple synthesis approach, and an appealing output so that they can be used widely in various fields. Herein, highly fluorescent CQDs were synthesized hydrothermally using artichoke leaves. The CQDs were synthesized and analyzed for their structure, optical properties, antimicrobial, and anticancer activities. The CQDs exhibited antimicrobial action against a single fungus strain in addition to Gram-positive and Gram-negative cells;also, the cytotoxicity against the MCF-7 cell line was evaluated as 96.5 µg/mL. The findings indicated that the spherical dots have a semi-spherical shape with the smallest size of 2.88 nm, and a zeta potential value of 37.31 V, thus confirming that the synthetic CQDs are in an outstanding colloidal state. When photoexcited at 320 nm, the dots were found to show blue fluorescence at 398 nm with a fluorescence quantum yield of 3.32%, long fluorescence decay time, high photostability, and good sensing for hydrogen peroxide. Additionally, the effect of ionic strength was evaluated. © The Author(s) 2025.

关键词： Antimicrobial activity Artichoke Carbon quantum dots (CQDs) Green synthesis

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Paired electron motion in interacting chains of quantum dots

arXiv

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arXiv 2020年

作者： Szafran, Bartlomiej AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. Mickiewicza 30 Kraków30-059 Poland

We study the motion of a pair of electrons along two separate parallel chains of quantum dots. The electrons that are released from the central dot of each chain tend to accompany and not avoid each other. The correlated electron motion involves entanglement of the wave functions which is generated in time upon release of the initial confinement. Observation of the simultaneous presence of electrons at the same side of the chain can provide fingerprint of the paired electron motion. Copyright © 2020, The Authors. All rights reserved.

关键词： Electrons

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Cardano Shared Send Transactions Untangling in Numbers

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Blockchain: Research and Applications 2025年

作者： Mostafa Chegenizadeh Nickolay Larionov Sina Rafati Niya Yury Yanovich Claudio J. Tessone Department of Informatics University of Zurich Switzerland Moscow Institute of Physics and Technology Moscow Russia Skolkovo Institute of Science and Technology Moscow Russia Faculty of Computer Science HSE University Russia UZH Blockchain Center University of Zurich Switzerland

In this paper, we analyze Shared Send Mixers (SSMs) within Cardano's Extended Unspent Transaction Output (EUTXO) model, presenting significant contributions to the understanding of UTXO-based blockchains. Firstly, we define the EUTXO SSM untangling problem and propose an algorithm to address it, along with providing an open-source implementation of the solution. Utilizing real transaction examples, we formulate and solve this problem in a systematic manner, shedding light on the intricacies of coin circulation within the Cardano blockchain. Through our analysis, we reveal insights into the usage of SSMs, including statistics on their frequency and effectiveness in untangling transactions. With this method, our findings show that 11% of transactions—as per the method—seem to involve SSMs, 83% of which enable unique untangling. Moreover, we discuss the potential application of our algorithm in enhancing address clustering results of transaction-level heuristics. Overall, our work contributes to a deeper understanding of transactional dynamics within UTXO cryptocurrencies, particularly within the context of Cardano's EUTXO model.

关键词： Shared Send Mixer Extended UTXO Cardano Blockchain Analytics Transaction Analysis

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Laser ring structures in step-index fibers

Laser ring structures in step-index fibers

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International Conference on Electronics, Engineering physics and Earth science 2022, EEPES 2022

作者： Slavchev, V. Dakova, A. Gocheva, N. Bozhikoliev, I. Kovachev, K. Biswas, A. Nonlinear and Fiber Optics Institute of Electronics Bulgarian Academy of Science 72 Tzarigradcko shossee Sofia1784 Bulgaria Physics and Technology Faculty University of Plovdiv "paisii Hilendarski 24 Tsar Asen Str. Plovdiv4000 Bulgaria Department of Medical Physics and Biophysics Medical University-Plovdiv 15 Vasil Aprilov Bul. Plovdiv4002 Bulgaria Department of Applied Mathematics National Research Nuclear University 31 Kashirskoe Hwy Moscow115409 Russia Research Group Department of Mathematics King Abdulaziz University Jeddah21589 Saudi Arabia Department of Mathematics and Applied Mathematics Sefako Makgatho Health Sciences University Medunsa Pretoria0204 South Africa Department of Physics Chemistry and Mathematics Alabama Agricultural and Mechanical University NormalAL35762-4900 United States Department of Applied Sciences Cross-Border Faculty Dunarea de Jos University of Galati 111 Domneasca Street Galati800201 Romania

The formation and propagation of optical ring structures, given by a system of amplitude equations for the components of the electric field is investigated. The calculations are made in approximation of second-order linear dispersion and self-phase modulation. New class analytical solutions, characterizing the generation and evolution of laser ring structures in optical waveguides with step-index profile and anomalous dispersion, are described in the present work. The stability of these optical formations is a result of the specific combination of nonlinearity, diffraction and angular distribution. Laser vortices have an amplitude type of singularity which appears as depolarization of the vector field in the light radiation spot. © 2022 Published under licence by IOP Publishing Ltd.

关键词： Dispersion (waves)

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Superconducting dome in LaAlO3/SrTiO3 interfaces as a direct consequence of the extended s-wave symmetry of the gap

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Physical Review B 2020年第8期102卷 085420-085420页

作者： M. Zegrodnik P. Wójcik Academic Centre for Materials and Nanotechnology AGH University of Science and Technology Al. Mickiewicza 30 30-059 Krakow Poland AGH University of Science and Technology Faculty of Physics and Applied Computer Science Al. Mickiewicza 30 30-059 Krakow Poland

The two-dimensional electron gas (2DEG) at the LaAlO3/SrTiO3 interface exhibits gate-tunable superconductivity with a domelike shape of TC as a function of electron concentration. Here, we propose that the experimentally observed behavior can be explained as a direct effect of the dominant extended s−wave symmetry of the superconducting gap. Our results agree very well with the experimental data. As shown, neither the correlation effects nor the spin-orbit coupling significantly influence the physical picture of the paired state stemming from our analysis.

关键词： Multiband superconductivity Superconducting gap Superconducting order parameter Superconductivity Solid-solid interfaces Two-dimensional electron system Unconventional superconductors Bogoliubov-de Gennes equations Lattice models in condensed matter Many-body techniques

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