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arXiv 2023年

作者： Koziol-Rachwal, A. Kwiatek, N. Skowroński, W. Grochot, K. Kanak, J. Madej, E. Freindl, K. Korecki, J. Spiridis, N. Faculty of Physics and Applied Computer Science AGH University of Science and Technology al. Mickiewicza 30 Kraków30-059 Poland Jerzy Haber Institute of Catalysis and Surface Chemistry Polish Academy of Sciences Kraków30-239 Poland Institute of Electronics AGH University of Science and Technology Al. Mickiewicza 30 Kraków30-059 Poland

We report on the chemical structure and spin Hall magnetoresistance (SMR) in epitaxial αFe2O3(hematite)(0001)/Pt(111) bilayers with hematite thicknesses of 6 nm 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 hematite increased from 6 nm to 15 nm. For αFe2O3(15 nm)/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. © 2023, CC BY.

关键词： Hematite

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Exploring nonstandard Hbb¯ interactions at future electron-proton colliders

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Physical Review D 2024年第9期109卷 095023-095023页

作者： Gholamhossein Haghighat Reza Jafari Hamzeh Khanpour Mojtaba Mohammadi Najafabadi School of Particles and Accelerators Institute for Research in Fundamental Sciences (IPM) P.O. Box 19395-5531 Tehran Iran Department of Physics University of Tehran North Karegar Avenue Tehran 14395-547 Iran AGH University Faculty of Physics and Applied Computer Science Al. Mickiewicza 30 30-055 Kraków Poland Department of Physics University of Science and Technology of Mazandaran P.O. Box 48518-78195 Behshahr Iran

In this paper, we use the charged-current Higgs boson production process at future electron-proton colliders, e−p→Hjνe, with the subsequent decay of the Higgs boson into a bb¯ pair, to probe the Standard Model effective field theory with dimension-six operators involving the Higgs boson and the bottom quark. The study is performed for two proposed future high-energy electron-proton colliders, the Large Hadron Electron Collider (LHeC) and the Future Circular Collider (FCC-he) at the center-of-mass energies of 1.3 TeV and 3.46 TeV, respectively. Constraints on the CP-even and CP-odd Hbb¯ couplings are derived by analyzing the simulated signal and background samples. A realistic detector simulation is performed and a multivariate technique using the gradient boosted decision trees algorithm is employed to discriminate the signal from background. Expected limits are obtained at 95% confidence level for the LHeC and FCC-he assuming the integrated luminosities of 1, 2 and 10 ab−1. We find that using 1 ab−1 of data, the CP-even and CP-odd Hbb¯ couplings can be constrained with accuracies of the order of 10−3 and 10−2, respectively, and a significant region of the unprobed parameter space becomes accessible.

关键词： Effective field theory Higgs bosons Lepton-hadron colliders

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Socio-cognitive Optimization of Time-delay Control Problems using Agent-based Metaheuristics

Socio-cognitive Optimization of Time-delay Control Problems ...

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International IEEE Conference on Intelligent Systems, IS

作者： Mateusz Nabywaniec Hubert Guzowski Aleksandra Urbańczyk Maciej Smolka Marek Kisiel-Dorohinicki Aleksander Byrski Zuzana Kominkova Oplatkova Roman Senkerik Libor Pekar Radek Matusu Frantisek Gazdos Institute of Computer Science AGH University of Science and Technology Krakow Poland Faculty of Applied Informatics Tomas Bata University in Zlín Czech Republic

ISBN: (纸本)9781665492768

Following the introduction of the socio-cognitive caste-based algorithms into the classic evolutionary metaheuristics, in this paper we focus on similar task regarding agent-based universal optimization methods. We tackle EMAS and DE algorithms and enrich them also with TOPSIS-inspired mechanism. Besides giving the details of the methods and the background, we present preliminary results after applying those techniques to solving the problem of optimization of time-delay system model.

关键词： Metaheuristics Optimization methods Task analysis Intelligent systems

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Global existence and mean-field limit for a stochastic interacting particle system of signed Coulomb charges

arXiv

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arXiv 2024年

作者： van Meurs, Patrick Peletier, Mark A. Slangen, Thomas Faculty of Mathematics and Physics Institute of Science and Engineering Kanazawa University Kakuma Kanazawa920-1192 Japan Department of Mathematics and Computer Science Eindhoven University of Technology Netherlands

We study a system of stochastic differential equations with singular drift which describes the dynamics of signed particles in two dimensions interacting by the Coulomb potential. In contrast to the well-studied cases of identical particles that either all repel each other or all attract each other, this system contains both 'positive' and 'negative' particles. Equal signs repel and opposite signs attract each other;apart from the sign, the potential is the same. We derive results on well-posedness of the system, on the type of collisions that can occur, and on the mean-field limit as the number of particles tends to infinity. Our results demonstrate that the signed system shares features of both the fully repulsive and the fully attractive cases. Our proof method is inspired by the work of Fournier and Jourdain (The Annals of applied Probability, 27, pp. 2807-2861, 2017) on the fully attractive case;we construct an approximate system of equations, establish uniform estimates, and use tightness to pass to *** Codes 65C35, 35K55, 60H10 Copyright © 2024, The Authors. All rights reserved.

关键词： Stochastic systems

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Exploring CST Simulation Techniques for TEM Mode and Unit Cell Analysis to Determine Refractive Index 12

Exploring CST Simulation Techniques for TEM Mode and Unit Ce...

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12th International Electrical Engineering Congress, iEECON 2024

作者： Malathong, Kritthanit Konpang, Jessada Kongjareansuk, Sayree Akkaraekthalin, Prayoot Chudpooti, Nonchanutt Thitimahatthanakusol, Phatsakul Rajamangala University Of Technology Krungthep Faculty Of Engineering Department Of Electrical And Telecommunication Engineering 2 Nanglingee Rd. Sathorn Thungmahamek Bangkok10120 Thailand Rajamangala University Of Technology Krungthep Faculty Of Engineering Department Of Electrical And Telecommunication Engineering Bangkok Sathorn10120 Thailand King Mongkut's University Of Technology North Bangkok Faculty Of Engineering Department Of Electrical And Computer Engineering 1518 Pracharat 1 Road Bangsue Bangkok10800 Thailand King Mongkut's University Of Technology North Bangkok Faculty Of Applied Science Department Of Industrial Physics And Medical Instrumentation Bangkok10800 Thailand Rajamangala University Of Technology Isan Faculty Of Engineering And Technology Department Of Telecommunication Engineering 744 Sura Narai Rd Nai-muang Mueang Nakhon Ratchasima Nakorn Ratchasima30000 Thailand

ISBN: (纸本)9798350383591

The study investigates the accuracy of CST simulations in TEM mode and unit cell simulations for determining the refractive index (n) of materials. The results in TEM mode align with the expected properties of air, affirming the correctness of settings. However, when using unit cell simulations, the materials properties template inaccurately calculates n values, deviating from reality. Further examination reveals that unit cell simulations emit waves of different modes (TE, TM, or CP) instead of TEM, leading to inconsistencies. A revised equation is introduced to address this discrepancy, yielding results closer to actual n values. The importance of parameters like D and m is emphasized, as variations significantly impact the n values obtained. The introduced equation provides more accurate n cal-culations in unit cell simulations than the default CST template. © 2024 IEEE.

关键词： Refractive index

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Socio-cognitive Optimization of Time-delay Control Problems using Evolutionary Metaheuristics

Socio-cognitive Optimization of Time-delay Control Problems ...

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International IEEE Conference on Intelligent Systems, IS

作者： Piotr Kipiński Hubert Guzowski Aleksandra Urbańczyk Maciej Smołka Marek Kisiel-Dorohinicki Aleksander Byrski Zuzana Kominkova Oplatkova Roman Senkerik Libor Pekar Radek Matusu Frantisek Gazdos Institute of Computer Science AGH University of Science and Technology Krakow Poland Faculty of Applied Informatics Tomas Bata University in Zlín Czech Republic

ISBN: (纸本)9781665492768

Metaheuristics are universal optimization algorithms which should be used for solving difficult problems, unsolvable by classic approaches. In this paper we aim at constructing novel socio-cognitive metaheuristic based on castes, and apply several versions of this algorithm to optimization of time-delay system model. Besides giving the background and the details of the proposed algorithms we apply them to optimization of selected variants of the problem and discuss the results.

关键词： Computational modeling Metaheuristics Evolutionary computation Intelligent systems Genetic algorithms

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Effective Parametric Optimization of Heating-Cooling Process with Optimum near the Domain Border

Effective Parametric Optimization of Heating-Cooling Process...

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International IEEE Conference on Intelligent Systems, IS

作者： Hubert Guzowski Maciej Smołka Aleksander Byrski Libor Pekar Zuzana Kominkova Oplatkova Roman Senkerik Radek Matusu Frantisek Gazdos Institute of Computer Science AGH University of Science and Technology Krakow Poland Faculty of Applied Informatics Tomas Bata University in Zlín Czech Republic

ISBN: (纸本)9781665492768

Heating-cooling processes are widely used in industry and are often subject to latencies and delays. Although the parameters of such processes can be identified using mathematical and physical modeling, this technique is highly demanding both when it comes to the amount of a priori knowledge required and the time it takes to find a solution. In this work, we provide a robust formulation of a time-delay control problem and propose a numerical approach to finding its parameters in a form of an optimization task. Consequently, we apply various techniques and metaheuristics to obtain a high quality solution and discuss key observations made in the process.

关键词： Heating systems Perturbation methods Process control Mathematical models Numerical models Delays Task analysis

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Ni-Co-Fe-Mn-Ti High Entropy Alloy Manufacturing Via Powder Bed Fusion Using Elemental Powders

SSRN

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SSRN 2023年

作者： Bardo, Radoslaw Dziurka, Rafal Fryzowicz, Krzysztof Cios, Grzegorz Marciszko-Wiąckowska, Marianna Gajewska, Marta Hain, Caroline Bala, Piotr AGH University of Science and Technology Faculty of Metals Engineering and Industrial Computer Science Krakow Poland Progresja Katowice Poland AGH University of Science and Technology Academic Centre for Materials and Nanotechnology Krakow Poland Institute for Applied Laser Photonics and Surface Technologies ALPS Bern University of Applied Sciences Biel/Bienne Switzerland Laboratory for Mechanics of Materials and Nanostructures Empa Swiss Federal Laboratories for Materials Science and Technology Thun Switzerland

This study aimed to fabricate Ni-Co-Fe-Mn-Ti high entropy alloys (HEA) via powder bed fusion method using elemental powders. Based on thermodynamic calculations, 3 alloys were designed with medium to high entropy (from 3 to 5 components) and printed out. Additive manufacturing (AM) was performed, while varying the laser power and exposure time (point-by-point exposure laser working mode). The obtained samples were characterised by means of macroscopic observations combined with porosity analysis, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), electron backscatter diffraction (EBSD), X-ray diffraction (XRD), as well as compression and hardness test. The varied process parameters and the content of individual alloying elements directly impacted alloy processability and sample properties. We proved that it is possible to produce HEAs (Ni-Co-Fe-Mn-Ti) with low porosity and good chemical homogeneity from elemental powders. By comparing the processes of producing 3-, 4-, and 5-component alloys, it was observed that it is not the quantity of the components but the melting temperatures of the individual elemental powders and their tendency to oxidize that condition obtaining good 3D prints. The most promising results for 5-component HEAs were obtained for 1.45 ms of laser exposure time combined with laser powers of 250 and 300 W. © 2023, The Authors. All rights reserved.

关键词： 3D printing

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A review of hydrogen production from bio-energy, technologies and assessments

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Energy Harvesting and Systems 2024年第1期11卷

作者： Hassan, Qusay Hafedh, Saadoon Abdul Mohammed, Hussein Burhan Abdulrahman, Imad Saeed Salman, Hayder M. Jaszczur, Marek Department of Mechanical Engineering University of Diyala Diyala Iraq Department of Computer Science Al-Turath University College Baghdad Iraq College of Technical Engineering Al-Farahidi University Baghdad Iraq Faculty of Energy and Fuels AGH University of Science and Technology Krakow Poland

The earth natural carrying capacity is being surpassed, and there is an urgent need to develop new alternatives, notably in regards to energy supplies, carbon dioxide emissions, and nitrogen supplies to the ecosystem. Hydrogen gas, produced from renewable energy by water electrolysis, may serve as a platform molecule for the 21st century low-carbon economy and electrification. The ability to utilise hydrogen metabolic processes is quite diverse, and this offers up a vast array of avenues for innovative biotechnological advancements and applications. A strategy focusing on the major role of hydrogen throughout the production of bio-based foundational element compounds through the hydrocarbon pathway would avoid the inherent low economic value of hydrocarbons in favour of products with greater value. Furthermore, hydrogen could serve as a crucial carbon-neutral source for the manufacture of third-generation proteins while allowing carbon capture and nutritional recovery immediately at the site of emission. Using these methods to deal with the seasonal changes in renewable energy sources makes the use of alternative energy as efficient as possible. The outcomes demonstrated the production technologies of bio-hydrogen is a good way to make renewable hydrogen that is both cost-effective and good for the environment compared to other ways of making hydrogen. © 2024 the author(s), published by De Gruyter.

关键词： Hydrogen production

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Models of Battle Dynamics in Strategic computer Games 16

Models of Battle Dynamics in Strategic Computer Games

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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

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