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arXiv 2022年

作者： Gawronski, Przemyslaw Borzì, Alfio Kulakowski, Krzysztof Faculty of Physics and Applied Computer Science AGH University of Science and Technology al. Mickiewicza 30 KrakówPL-30059 Poland Institut für Mathematik Universität Würzburg Emil-Fischer-Strasse 30 Würzburg97074 Germany

The system of two resources R1, R2 and one consumer C is investigated within the Rosenzweig-MacArthur model with Holling type II functional response. The rates βi of consumption of resources i = 1, 2 are coupled by the condition β1 + β2 = 1. The dynamic switching is introduced by a maximization of C: dβ1/dt = (1/τ)dC/dβ1, where the characteristic time τ is large but finite. The space of parameters where both resources coexist is explored numerically. The results indicate that oscillations of C and mutually synchronized Ri which appear at βi = 0.5 are destabilized for βi larger or smaller. Then, the system is driven to one of fixed points where either β1 > 0.5 and R1 © 2022, CC BY.

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A VNS Approach for Batch Sequencing and Route Planning in Manual Picking System with Time Windows 1

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7th International Conference on Variable Neighborhood Search, ICVNS 2019

作者： Duda, Jerzy Stawowy, Adam Department of Applied Computer Science Faculty of Management AGH University of Science and Technology Gramatyka St. 10 Krakow30-067 Poland

ISBN: (数字)9783030449322

ISBN: (纸本)9783030449315

In this paper an order picking and route planning problem is studied. The main objective is to minimize the number of pickers involved in collecting the order pool and the total distance covered by the pickers. Since the problem under study is NP-hard, a variable neighborhood search (VNS) is proposed as a heuristic solution approach. Neighborhood is changed according to VNS scheme employing four tailored structures. Finally, computational tests demonstrate that the proposed VNS algorithm can find good quality solutions for all practical problems examined. The objective values, regarding both the number of pickers employed and the total distance covered by them, are better than the results of genetic algorithm and close to the ones obtained by CPLEX Solver, if it was able to provide a feasible solution. © 2020, Springer Nature Switzerland AG.

关键词： Genetic algorithms

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Cross-linked chitosan/H-ZSM-5 zeolite composite film for chromium removal from aqueous solutions: optimization using response surface methodology and adsorption mechanism assessment

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Environmental science and Pollution Research 2025年 1-23页

作者： Slamani, Imene Bengharez, Zohra Boudouaia, Nacer Bendaoudi, Amine Ahmed Jellali, Salah Benhafsa, Fouad Mekhalef Mahmoudi, Hacene Benhadria, Naceur Guemra, Kaddour Jeguirim, Mejdi Laboratory of Advanced Materials and Physico-Chemistry for Environment and Health Faculty of Exact Sciences Djillali Liabes University Sidi Bel Abbes22000 Algeria Center for Environmental Studies and Research Sultan Qaboos University Muscat Oman Scientific and Technical Research Center in Physico-Chemical Analysis CRAPC Tipaza Algeria Faculty of Exact Sciences and Computer Science Abdelhamid Benbadis University Mostaganem Algeria National Higher School of Nanosciences and Nanotechnologies Algiers Sidi Abdellah Algeria University of Oran 1 Ahmed Ben Bella Oran Algeria Higher School of Applied Sciences P.O. Box 165 RP Tlemcen13000 Algeria Laboratory of Organic Chemistry Physics and Macromolecules Faculty of Exact Sciences Djillali Liabes University Sidi Bel Abbes22000 Algeria University of Haute Alsace University of Strasbourg CNRS UMR 7361 MulhouseF-68100 France

The present work investigates, for the first time, the synthesis of a composite film based on glutaraldehyde-cross-linked chitosan (GA-CS) and a natural zeolite (H-ZSM-5) and its application for the removal of hexavalent chromium (Cr(VI)) from aqueous solutions under wide experimental conditions. The composite film (GA-CS-ZEO) characterization by using various analytical techniques confirms its successful production with promising physical, chemical, and thermal properties. The use of the response surface methodology (RSM) for the optimization of the Cr(VI) adsorption by this composite shows that that the maximum removal efficiency (82.39%) was achieved for a Cr(VI) concentration of 50 mg L−1, an initial pH of 2.0, a contact time of 100 min, and a temperature of 20 °C. Moreover, the analysis of variance (ANOVA) and 3D graphs indicated that the pH and initial Cr(VI) concentration were the main factors that influence the Cr(VI) uptake efficiency. Besides that, the Cr(VI) removal by the GA-CS-ZEO was found to be spontaneous and endothermic and occurs mainly via physical mechanisms involving electrostatic interactions and hydrogen bonding. Regeneration study of the Cr(VI)-loaded composite showed that Cr(VI) can be rapidly and efficiently desorbed by 0.1 M sulfuric acid. The results of the current research work highlight the important adsorption potential of Cr(VI) by the GA-CS-ZEO composite film and underscore its attractiveness and suitability for water treatment applications. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.

关键词： Hydrogen bonds

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RerrFact: Reduced Evidence Retrieval Representations for Scientific Claim Verification

RerrFact: Reduced Evidence Retrieval Representations for Sci...

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2022 Workshop on Scientific Document Understanding, SDU 2022

作者： Rana, Ashish Khanna, Deepanshu Ghosal, Tirthankar Singh, Muskaan Singh, Harpreet Rana, Prashant Singh School of Business Informatics and Mathematics University of Mannheim Germany Department of Electronics & Communication Engineering Thapar Institute of Engineering & Technology India Institute of Formal and Applied Linguistics Faculty of Mathematics and Physics Charles University Czech Republic Department of Computer Science & Engineering Thapar Institute of Engineering & Technology India

Exponential growth in digital information outlets and the race to publish has made scientific misinformation more prevalent than ever. However, the task to fact-verify a given scientific claim is not straightforward even for researchers. Scientific claim verification requires in-depth knowledge and great labor from domain experts to substantiate supporting and refuting evidence from credible scientific sources. The SciFact dataset and corresponding task provide a benchmarking leaderboard to the community to develop automatic scientific claim verification systems via extracting and assimilating relevant evidence rationales from source abstracts. In this work, we propose a modular approach that sequentially carries out binary classification for every prediction subtask as in the SciFact leaderboard. Our simple classifier-based approach uses reduced abstract representations to retrieve relevant abstracts. These are further used to train the relevant rationale-selection model. Finally, we carry out two-step stance predictions that first differentiate non-relevant rationales and then identify supporting or refuting rationales for a given claim. Experimentally, our system RerrFact with no fine-tuning, simple design, and a fraction of model parameters fairs competitively on the leaderboard against large-scale, modular, and joint modeling approaches. © 2022 Copyright for this paper by its authors.

关键词： Abstracting

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Spin-orbit torque induced magnetization dynamics and switching in a CoFeB/Ta/CoFeB system with mixed magnetic anisotropy

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Physical Review B 2021年第13期103卷 134421-134421页

作者： Stanisław Łazarski Witold Skowroński Krzysztof Grochot Wiesław Powroźnik Jarosław Kanak Marek Schmidt Tomasz Stobiecki Institute of Electronics AGH University of Science and Technology Al. Mickiewicza 30 30-059 Kraków Poland Faculty of Physics and Applied Computer Science AGH University of Science and Technology Al. Mickiewicza 30 30-059 Kraków Poland Institute of Molecular Physics Polish Academy of Sciences ul. Smoluchowskiego 17 60-179 Poznań Poland

Spin-orbit torque (SOT) induced magnetization switching in CoFeB/Ta/CoFeB trilayer with two ferromagnetic CoFeB layers exhibiting in-plane and perpendicular magnetic anisotropy (PMA), respectively, is investigated. Interlayer exchange coupling (IEC), measured using the ferromagnetic resonance technique is modified by varying thickness of the heavy metal Ta spacer (tTa). The evolution of the IEC with tTa leads to different orientations of the magnetic anisotropy axes of two CoFeB layers: for tTa>1.3nm, magnetization prefers antiferromagnetic alignment, whereas for tTa<1.3nm, ferromagnetic coupling is measured. The magnetization state of the CoFeB layer exhibiting PMA is controlled by the spin-polarized current originating from the Ta layer in micrometer sized Hall bars. The SOT induced critical current density with Ta spacer thickness is presented, showing an increase with decreasing tTa, which coincides with the CoFeB coercive field dependence. In a narrow range of tTa corresponding to the ferromagnetic IEC, the field-free SOT induced magnetization switching is achieved.

关键词： Magnetic anisotropy Magnetization switching Spin Hall effect Spin accumulation Spin torque Spin-orbit coupling Spintronics Magnetic multilayers Ferromagnetic resonance Resistivity measurements X-ray diffraction X-ray reflectivity

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Sawtooth lattice multiferroic BeCr2O4: Noncollinear magnetic structure and multiple magnetic transitions

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Physical Review Materials 2023年第2期7卷 024422-024422页

作者： Hector Cein Mandujano Alejandro Metta Neven Barišić Qiang Zhang Wojciech Tabiś Naveen Kumar Chogondahalli Muniraju Harikrishnan S. Nair Department of Physics 500 West University Avenue University of Texas at El Paso El Paso Texas 79968 USA Department of Chemistry 500 West University Avenue University of Texas at El Paso El Paso Texas 79968 USA Institute of Solid State Physics Vienna University of Technology Wiedner Hauptstrße 8–10 1040 Vienna Austria Department of Physics Faculty of Science University of Zagreb Bijenička cesta 32 10000 Zagreb Croatia Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge Tennessee 37830 USA AGH University of Science and Technology Faculty of Physics and Applied Computer Science 30-059 Krakow Poland The Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences 152 Radzikowskiego Strasse 31-342 Krakow Poland Institute of Physics Bijenička cesta 46 HR-10000 Zagreb Croatia

Noncollinear magnetic structures and multiple magnetic phase transitions in a sawtooth lattice antiferromagnet consisting of Cr3+ are experimentally identified in this work, thereby proposing the scenario of magnetism-driven ferroelectricity in a sawtooth lattice. The title compound, BeCr2O4, displays three magnetic phase transitions at low temperatures—at TN1≈7.5 K, at TN2≈25 K, and at TN3≈26 K—revealed through magnetic susceptibility, specific heat, and neutron diffraction in this work. These magnetic phase transitions are found to be influenced by externally applied magnetic fields. Isothermal magnetization curves at low temperatures below the magnetic transitions indicate the antiferromagnetic nature of BeCr2O4 with two spin-flop-like transitions occurring at Hc1≈29 kOe and Hc2≈47 kOe. Our high-resolution x-ray and neutron diffraction studies, performed on single crystal and powder samples, unambiguously determined the crystal structure as orthorhombic Pbnm. By performing the magnetic superspace group analysis of the neutron diffraction data at low temperatures, the magnetic structure in the temperature range TN3,N2

关键词： Multiferroics Neutron diffraction X-ray diffraction

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Integrability of polynomial vector fields and a dual problem

arXiv

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arXiv 2024年

作者： Petek, Tatjana Romanovski, Valery G. Faculty of Electrical Engineering and Computer Science University of Maribor Koroska cesta 46 MariborSI-2000 Slovenia Institute of Mathematics Physics and Mechanics Jadranska 19 LjubljanaSI-1000 Slovenia Faculty of Natural Science and Mathematics University of Maribor Koroska cesta 160 MariborSI-2000 Slovenia Center for Applied Mathematics and Theoretical Physics Mladinska 3 MariborSI-2000 Slovenia

We investigate the integrability of polynomial vector fields through the lens of duality in parameter spaces. We examine formal power series solutions annihilated by differential operators and explore the properties of the integrability variety in relation to the invariants of the associated Lie group. Our study extends to differential operators on affine algebraic varieties, highlighting the intrinsic connection between these operators and local analytic first integrals. To illustrate the duality the case of quadratic vector fields is considered in detail. © 2024, CC BY.

关键词： Choquet integral

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Direct Optical Probing of the Magnetic Properties of the Layered Antiferromagnet CrPS4

arXiv

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arXiv 2024年

作者： Fąs, Tomasz Wlazlo, Mateusz Birowska, Magdalena Rybak, Milosz Zinkiewicz, Malgorzata Oleschko, Leon Goryca, Mateusz Gondek, Lukasz Camargo, Bruno Szczytko, Jacek Budniak, Adam K. Amouyal, Yaron Lifshitz, Efrat Suffczyński, Jan Institute of Experimental Physics Faculty of Physics University of Warsaw Pasteura St. 5 Warsaw02-093 Poland Chemical and Biological Systems Simulation Lab Centre of New Technologies University of Warsaw Warsaw02-097 Poland Institute of Theoretical Physics Faculty of Physics University of Warsaw Pasteura St. 5 Warsaw02-093 Poland Department of Semiconductor Materials Engineering Faculty of Fundamental Problems of Technology Wroclaw University of Science and Technology Wybrzeże Wyspiańskiego 27 Wroclaw50-370 Poland Department of Physics University of Konstanz Universitätsstraße 10 KonstanzD-78457 Germany Faculty of Physics and Applied Computer Science AGH University of Kraków Mickiewicza 30 Kraków30-059 Poland Schulich Faculty of Chemistry Technion – Israel Institute of Technology Haifa3200003 Israel Department of Materials Science and Engineering Technion – Israel Institute of Technology Haifa3200003 Israel

Unusual magnetic properties of Van der Waals type antiferromagnetic semiconductors make them highly attractive for spintronics and optoelectronics. A link between the magnetic and optical properties of those materials, required for practical applications, has not been, however, established so far. Here, we report on a combined experimental and theoretical study of magnetic, optical, and structural properties of bulk CrPS4 samples. We find that the magnetic-field-dependent circular polarization degree of the photoluminescence is a direct measure of the net magnetization of CrPS4. Complementary, Raman scattering measured as a function of magnetic field and temperature enables the determination of the magnetic susceptibility curve of the material. Our experimental results are backed by Our experimental results are supported by density functional theory calculations that take as input the lattice parameters determined from temperature-dependent X-ray diffraction measurements. This allows us to explain the impact of spin ordering on the spectral position of Raman transitions in CrPS4, as well as anomalous temperature shifts of selected of them. The presented method for all-optical determination of the magnetic properties is highly promising for studies of spin ordering and magnetic phase transitions in single- or a few-layer samples of magnetic layered materials, for which a poor signal-to-noise ratio precludes any reliable neutron scattering or magnetometry measurements. © 2024, CC BY.

关键词： Magnetic susceptibility

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Current-Induced Magnetization Switching of Exchange-Biased NiO Heterostructures Characterized by Spin-Orbit Torque

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Physical Review applied 2021年第1期15卷 014017-014017页

作者： Krzysztof Grochot Łukasz Karwacki Stanisław Łazarski Witold Skowroński Jarosław Kanak Wiesław Powroźnik Piotr Kuświk Mateusz Kowacz Feliks Stobiecki Tomasz Stobiecki Department of Electronics AGH University of Science and Technology Al. Mickiewicza 30 30-059 Kraków Poland Faculty of Physics and Applied Computer Science AGH University of Science and Technology Al. Mickiewicza 30 30-059 Kraków Poland Institute of Molecular Physics Polish Academy of Sciences ul. Smoluchowskiego 17 60-179 Poznań Poland

In this work, we study magnetization switching induced by spin-orbit torque in W (Pt)/Co/NiO heterostructures with variable thickness of W and Pt heavy-metal layers, a perpendicularly magnetized Co layer, and an antiferromagnetic NiO layer. Using current-driven switching and magnetoresistance and anomalous-Hall-effect measurements, we determine the perpendicular and in-plane exchange-bias field. Several Hall-bar devices possessing in-plane exchange bias from both systems are selected and analyzed in relation to our analytical switching model of the critical current density as a function of Pt and W thickness, resulting in estimation of the effective spin Hall angle and perpendicular effective magnetic anisotropy. We demonstrate in both the Pt/Co/NiO system and the W/Co/NiO system deterministic Co magnetization switching without an external magnetic field, which is replaced by an in-plane exchange-bias field. Moreover, we show that due to a higher effective spin Hall angle in the W-based system than in the Pt-based system, the relative difference between the resistance states in the magnetization current switching to the difference between the resistance states in magnetic field switching determined by the anomalous Hall effect (ΔR/ΔRAHE) is about twice as high in W-based devices than in Pt-based devices, while the critical switching-current density in W-based devices is 1 order lower than in Pt-based devices. The current-switching stability and the training process are discussed in detail.

关键词： Exchange bias Magnetization switching Spin torque Spin-orbit coupling Spintronics Antiferromagnets Magnetic multilayers Transition metal oxides

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Unmilled Rice Moisture Content Sensor for Rice Mill Factory Applications

Unmilled Rice Moisture Content Sensor for Rice Mill Factory ...

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International Electrical Engineering Congress (iEECON)

作者： Somporn Seewattanapon Nonchanutt Chudpooti Prayoot Akkaraekthalin Faculty of Engineering and Architecture Rajamangala University of Technology Suvarnabhumi Nonthaburi Thailand Department of Industrial Physics and Medical Instrumentation Faculty of Applied Science King Mongkut's University of Technology North Bangkok Bangkok Thailand Departmemnt of Electrical and Computer Engineering Faculty of Engineering King Mongkut's University of Technology North Bangkok Bangkok Thailand

ISBN: (数字)9798350383591

ISBN: (纸本)9798350383607

This research presents a novel electromagnetic-based sensor for inline measurement of unmilled rice paddy moisture content in the rice mill factory. The proposed sensor has been designed based on the modified planar dipole structure at the operating frequency of 440 MHz. The unmilled rice dielectric constant properties have been studied and applied for characterizing the moisture content. The unmilled rice moisture content sensor system then has been designed consisting of the proposed sensor, a microwave signal generator, a microwave signal detector, and a microcontroller. The moisture content sensor system has been implemented and used for measuring the unmilled rice paddy moisture content in a real rice mill factory in Udon Thani province, Thailand. When compared with the commercial rice moisture content tool based on a capacitance technique, the proposed rice moisture content sensor system gives almost same results, which only about 4% difference has been found.

关键词： Microwave measurement Moisture measurement Transmitting antennas Moisture Receiving antennas Microwave theory and techniques Signal generators

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