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International Conference on Nanomaterials: Application & Properties (NAP)

作者： Julia Mazurenko Larysa Kaykan Mariia Moklyak Khrystyna Bandura Lukasz Gondek Antoni Żywczak Department of Medical Informatics Medical and Biological Physics Ivano Frankivsk National Medical University Ivano Frankivsk Ukraine Laboratory for Physics of Magnetic Films №23 G. V. Kurdyumov Institute for Metal Physics of the National Academy of Sciences of Ukraine Kyiv Ukraine Department of Materials Science and New Technologies Vasyl Stefanyk Precarpathian National University Ivano Frankivsk Ukraine Faculty of Physics and Applied Computer Science AGH University of Krakow Cracow Poland Academic Centre for Materials and Nanotechnology AGH University of Krakow Cracow Poland

ISBN: (数字)9798350380125

ISBN: (纸本)9798350380132

In this study, a series of magnesium-substituted spinels with general compositions of $\mathbf{M g}_{x} \mathrm{Cu}_{1-\mathrm{x}} \mathrm{Fe}_{2} \mathrm{O}_{4}$, where x varies from 0.0 to 1.0 a step of 0.2, was synthesize via the solgel autocombustion method. Citric acid is used as the chelating agent. The phase composition, particle size, and morphology of the materials were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray dispersion analysis. The effects of magnesium substitution on the magnetic properties of the samples were evaluated using a vibrating sample magnetometer (VSM). Additionally, degradation tests were conducted using spectrophotometer, with methylene blue (MB) selected as the model pollutant. The study demonstrates alterations in the structure and magnetic properties of the synthesized material. The spinel produced via self-combustion was found to be a mesoporous material with strong magnetic properties and significant sensitivity to visible light. Degradation tests using methylene blue as a pollutant showed effective dye removal, achieving 95% efficiency within 160 minutes. The copper spinel modified with magnesium ions proved to be an environmentally safe, stable, and effective photo-Fenton catalyst that is simple to synthesize and suitable for practical applications.

关键词： Ferrites Degradation X-ray scattering X-ray diffraction Ions Magnesium Copper Photocatalysts Saturation magnetization Magnetic properties

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Theoretical and Numerical Investigation of Acoustic Cavitation Bubble Based on the Impact of Ultrasound Frequency

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Bulletin of the Russian Academy of sciences: physics 2023年第Suppl 3期87卷 S341-S347页

作者： Ahmed K. Abu-Nab Abu-Bakr, Ali F. Zain Abu Shaeer Department of Mathematics and Computer Science Faculty of Science Menoufia University Shebin El-Koom32511 Egypt Phystech School of Applied Mathematics and Informatics Moscow Institute of Physics and Technology Moscow oblast Dolgoprudny141700 Russia Department of Basic Science Higher Institute of Engineering and Technology Kafr El Sheikh33511 Egypt

Abstract: Acoustic cavitation is the expansion and contraction of existing microbubbles in liquids brought on by an ultrasonic field. The dynamics of oscillations at higher pressures and temperatures when the cavitation bubbles collapse can be used to characterize cavitation dynamical behavior. This work deals with the theoretical and numerical investigation of acoustic cavitation in viscoelastic media considering the influence of ultrasound frequency. An acoustic pressure equation combined with a modified Rayleigh–Plesset equation forms the theoretical framework for ultrasound cavitation dynamics. The numerical solutions of the given cavitation bubble model were obtained taking into account the effect of acoustic pressure, using the exponential B-Spline collection method. The dynamics of the cavitation bubbles’ radius and the internal pressure of acoustic cavitation were examined at different values of viscosity and the impact of physical parameters on the monatomic, diatomic, and adiabatic gas-filled spherical bubble’s collapse dynamics for (k = 7/5, 5/3, 1) respectively. © Pleiades Publishing, Ltd. 2023. ISSN 1062-8738, Bulletin of the Russian Academy of sciences: physics, 2023, Vol. 87, Suppl. 3, pp. S341–S347. Pleiades Publishing, Ltd., 2023. ISSN 1062-8738, Bulletin of the Russian Academy of sciences: physics, 2023. Pleiades Publishing, Ltd., 2023.

关键词： Dynamics

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Comparison of the Heat Transfer Efficiency of Selected Water Cooling Systems

SSRN

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SSRN 2023年

作者： Jasiewicz, Elżbieta Hadala, Beata Cebo-Rudnicka, Agnieszka Malinowski, Zbigniew Jasiewicz, Kamil AGH University of Science and Technology Faculty of Metals Engineering and Industrial Computer Science Department of Heat Engineering and Environment Protection al. Mickiewicza 30 Kraków30-059 Poland Faculty of Energy and Fuels

The main purpose of the paper was to determine and compare the boundary conditions of heat transfer on the cooled surface of a cylindrical sensor made of Inconel 600 alloy during cooling with a water jet, water spray and air-assisted water spray under high-temperature conditions. The inverse method for the heat conduction equation was used to determine the boundary conditions. Experimental tests were carried out including temperature measurements at several points inside the cylinder during cooling with all tested systems from a temperature of 900℃ for three values of water pressure: 0.05 MPa, 0.1 MPa and 0.2 MPa. Temperature measurements were used as the input data to identify heat transfer boundary conditions. The temperature field of the axially symmetric sensor was determined using the Finite Element Method. The boundary conditions were determined as average values of heat transfer coefficient and heat flux and local values of heat transfer coefficient. A comparison of the amount of thermal energy dissipated from the sensor surface as a result of boiling and a forced single-phase convection were also presented in the paper. The highest uniformity of cooling was obtained during the air-assisted water spray cooling. © 2023, The Authors. All rights reserved.

关键词： Boundary conditions

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Mn2+ Pre-Intercalated Hydrated Vanadium Oxide as an Improved Cathode Material for Aqueous Zn-Ion Batteries

SSRN

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SSRN 2024年

作者： Nguyen-Ba, Kien Vo, Anh Tran Nguyen, Trang Thi Thu Van, Hieu-Nguyen Nguyen, Tan Ngoc Fung, Kuan-Zong Le-Quoc, Huy Ngoc, Dat-Trinh Le Vu, Truong Son Doan, Duong-Van Van, Man-Tran Luu, Binh-Duc Faculty of Advanced Science and Technology The University of Danang University of Science and Technology Da Nang Viet Nam Faculty of Mechanical Engineering The University of Danang University of Science and Technology Da Nang Viet Nam Faculty of Physics The University of Danang University of Science and Education Da Nang Viet Nam Advanced Materials and Process Engineering Laboratory Electrical and Computer Engineering University of British Columbia University of British Columbia Canada Department of Materials Science and Engineering National Cheng Kung University Tainan Taiwan Faculty of Chemistry The University of Danang University of Science and Education Da Nang Viet Nam Faculty of Chemistry VNUHCM University of Science Viet Nam

Hydrated vanadium oxide is a promising cathode material for aqueous Zn-ion batteries due to its tunable open frameworks and intrinsic multivalent states of vanadium. However, its cycling performance is hindered by structural instability and sluggish diffusion kinetics. In this study, we prepared a series of Mn2+ pre-intercalated hydrated vanadium oxide (MnVOH) using a hydrothermal method. By adjusting the synthesis temperature, the pre-intercalated Mn2+ expanded the interlayer spacing, improving the diffusion kinetics of Zn2+ and reducing structural degradation during the intercalation/(de)intercalation process. Consequently, MnVOH-140 exhibited a high specific capacity of 440 mAh/g at the discharge rate of 50 mA/g, superior to VOH-140 (247.5 mAh/g at 50 mA/g), and good cycling stability with 82.1% (113.1 mAh/g) capacity retention after 900 cycles at a high rate of 5A/g, compared to VOH-140 (74.5 mAh/g). The synthesis temperature directly affects the specific capacity and cycling stability of MnVOH. © 2024, The Authors. All rights reserved.

关键词： Vanadium compounds

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Cleaning large-dimensional covariance matrices for correlated samples

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Physical Review E 2022年第3期105卷 034136-034136页

作者： Zdzislaw Burda Andrzej Jarosz AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. Mickiewicza 30 30-059 Kraków Poland CRISIL Irevna Poland Sp z o.o. ul. Świętego Mikołaja 7 50-529 Wrocław Poland

We elucidate the problem of estimating large-dimensional covariance matrices in the presence of correlations between samples. To this end, we generalize the Marčenko-Pastur equation and the Ledoit-Péché shrinkage estimator using methods of random matrix theory and free probability. We develop an efficient algorithm that implements the corresponding analytic formulas based on the Ledoit-Wolf kernel estimation technique. We also provide an associated open-source Python library, called shrinkage, with a user-friendly API to assist in practical tasks of estimation of large covariance matrices. We present an example of its usage for synthetic data generated according to exponentially decaying autocorrelations.

关键词： Random matrix theory

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Developing tumor microenvironment in rotating human melanoma cell cultures: study of novel preclinical model

Research Square

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Research Square 2024年

作者： Wawrowicz, Kamil Durak-Kozica, Martyna Wierzbicki, Mateusz Stępień, Ewa L. Department of Medical Physics M. Smoluchowski Institute of Physics Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Kraków Poland Department of Nanobiotechnology Institute of Biology Warsaw University of Life Sciences Warsaw Poland

More than 97% of anticancer drugs under investigation fail in vitro evaluation, while only 0.4% of drug candidates that pass this stage proceed to the clinical trials. The differences between cell morphology and physiology observed in vitro and in vivo make the selection of a drug candidate problematic: traditional in vitro cultures do not reflect tissue-like conditions. Here we aimed for developing and characterizing human melanoma tumorspheres cultured in rotating bioreactors as an alternative for in vitro modeling. Tumorspheres were characterized by in-depth confocal imaging and image cytometry, followed by quantitative analysis that was used for whole tumorspheres characterization. Cell viability and changes in proteins expression were investigated in single-cell analysis through the spectral flow cytometry followed by STRING interaction networks assessment. The tumorspheres showed the ability to grow for at least one month to reach millimeter sizes. In this way, it was possible to improve the morphology of tumorspheres and to observe changes in tumor microenvironment (TME) and the expression of key proteins. The advantage of the described models is the creation of perspectives for further development of maintaining cellular models that are hybrid systems combining the features of spheroids and organoids for preclinical and translational research. © 2024, CC BY.

关键词： Cell culture

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Exploring non-standard Hbb interactions at future electron-proton colliders

arXiv

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arXiv 2023年

作者： Haghighat, Gholamhossein Jafari, Reza Khanpour, Hamzeh Najafabadi, Mojtaba Mohammadi P.O. Box 19395-5531 Tehran Iran Department of Physics University of Tehran North Karegar Avenue Tehran14395-547 Iran AGH University Faculty of Physics and Applied Computer Science Al. Mickiewicza 30 Kraków30-055 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 electronproton colliders, e-p → Hjve, 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 highenergy 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. Copyright © 2023, The Authors. All rights reserved.

关键词： Electrons

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Performance Evaluation and Proposed Enhancement of Latest Image Watermarking Schemes Against Specific Forgery Attacks

Performance Evaluation and Proposed Enhancement of Latest Im...

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International Conference on Network Applications Protocols and Services (NETAPPS)

作者： Adnan Nadeem AlHassan Muhammad Ashraf Amir Mehmood Hani Almoamari Saad Said Alqahtany Muhammad Sarim Qammer H. Abbasi Faculty of Computer and Information Systems Islamic University of Madinah Madinah Kingdom of Saudi Arabia Department of Physics Federal Urdu University of Arts Science and Technology Karachi Pakistan Department of Computer Science Al-Kawthar University Karachi Pakistan Department of Computer Science Federal Urdu University of Arts Science and Technology Karachi Pakistan James Watt School of Engineering (of Affiliation) University of Glasgow Glasgow United Kingdom

ISBN: (数字)9798331519513

ISBN: (纸本)9798331519520

Detection. Watermarking techniques can be classified based on various criteria, such as visibility, fragility, application domain, and extraction methods. However, their performance degrades against certain forgery attacks due to specific algorithmic loopholes. To deal with this issue, an in-depth performance evaluation and gap analysis of the latest invisible image watermarking schemes is presented in this paper. Then we propose an enhancement in terms of defining and using secret keys for the process of watermarking to improve temper detection and its localization against forgery attacks. First comprehensive testing is conducted regarding the imperceptibility and temper detection capability of these watermarking schemes against copy-paste, object deletion, text addition, and collage attacks. This testing results in finding the security weaknesses against collage attacks. Finally, we implemented the proposed enhancement and illustrated improved results up-to 99% in terms of localizing forgery detection in certain scenarios of collage attacks enhancement.

关键词： Performance evaluation Location awareness Protocols Watermarking Forgery Internet Classification algorithms Testing

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Probing miniband structure and Hofstadter butterfly in gated graphene superlattices via magnetotransport

arXiv

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arXiv 2023年

作者： Mreńca-Kolasińska, Alina Chen, Szu-Chao Liu, Ming-Hao AGH University Faculty of Physics and Applied Computer Science al. Mickiewicza 30 Kraków30-059 Poland Department of Physics National Cheng Kung University Tainan70101 Taiwan Department of Electro-Optical Engineering National Formosa University Yunlin Taiwan

The presence of periodic modulation in graphene leads to a reconstruction of the band structure and formation of minibands. In an external uniform magnetic field, a fractal energy spectrum called Hofstadter butterfly is formed. Particularly interesting in this regard are superlattices with tunable modulation strength, such as electrostatically induced ones in graphene. We perform quantum transport modeling in gate-induced square two-dimensional superlattice in graphene and investigate the relation to the details of the band structure. At low magnetic field the dynamics of carriers reflects the semi-classical orbits which depend on the mini band structure. We theoretically model transverse magnetic focusing, a ballistic transport technique by means of which we investigate the minibands, their extent and carrier type. We find a good agreement between the focusing spectra and the mini band structures obtained from the continuum model, proving usefulness of this technique. At high magnetic field the calculated four-probe resistance fit the Hofstadter butterfly spectrum obtained for our superlattice. Our quantum transport modeling provides an insight into the mini band structures, and can be applied to other superlattice geometries. Copyright © 2023, The Authors. All rights reserved.

关键词： Graphene

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Prediction of energy resolution in the JUNO experiment

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Chinese physics C 2025年第1期49卷 35-59页

作者： Angel Abusleme Thomas Adam Kai Adamowicz Shakeel Ahmad Rizwan Ahmed Sebastiano Aiello Fengpeng An Qi An Giuseppe Andronico Nikolay Anfimov Vito Antonelli Tatiana Antoshkina Joao Pedro Athayde Marcondes de André Didier Auguste Weidong Bai Nikita Balashov Wander Baldini Andrea Barresi Davide Basilico Eric Baussan Marco Bellato Marco Beretta Antonio Bergnoli Daniel Bick Lukas Bieger Svetlana Biktemerova Thilo Birkenfeld Iwan Blake David Blum Simon Blyth Anastasia Bolshakova Mathieu Bongrand Clément Bordereau Dominique Breton Augusto Brigatti Riccardo Brugnera Riccardo Bruno Antonio Budano Jose Busto Anatael Cabrera Barbara Caccianiga Hao Cai Xiao Cai Yanke Cai Zhiyan Cai Stéphane Callier Steven Calvez Antonio Cammi Agustin Campeny Chuanya Cao Guofu Cao Jun Cao Rossella Caruso Cédric Cerna Vanessa Cerrone Jinfan Chang Yun Chang Auttakit Chatrabhuti Chao Chen Guoming Chen Pingping Chen Shaomin Chen Xin Chen Yiming Chen Yixue Chen Yu Chen Zelin Chen Zhangming Chen Zhiyuan Chen Zikang Chen Jie Cheng Yaping Cheng YuChin Cheng Alexander Chepurnov Alexey Chetverikov Davide Chiesa Pietro Chimenti Yen-Ting Chin Po-Lin Chou Ziliang Chu Artem Chukanov Gérard Claverie Catia Clementi Barbara Clerbaux Marta Colomer Molla Selma Conforti Di Lorenzo Alberto Coppi Daniele Corti Simon Csakli Chenyang Cui Flavio Dal Corso Olivia Dalager Jaydeep Datta Christophe De La Taille Zhi Deng Ziyan Deng Xiaoyu Ding Xuefeng Ding Yayun Ding Bayu Dirgantara Carsten Dittrich Sergey Dmitrievsky Tadeas Dohnal Dmitry Dolzhikov Georgy Donchenko Jianmeng Dong Evgeny Doroshkevich Wei Dou Marcos Dracos Frédéric Druillole Ran Du Shuxian Du Katherine Dugas Stefano Dusini Hongyue Duyang Jessica Eck Timo Enqvist Andrea Fabbri Ulrike Fahrendholz Lei Fan Jian Fang Wenxing Fang Dmitry Fedoseev Li-Cheng Feng Qichun Feng Federico Ferraro Amélie Fournier Fritsch Fritsch Haonan Gan Feng Gao Feng Gao Alberto Garfagnini Arsenii Gavrikov Marco Giammarchi Nunzio Giudice Maxim Gonchar Guanghua Gong Hui Gong Yuri Gornushkin Marco Grassi Maxim Gromov Vasily Gromov Minghao G Yerevan Physics Institute YerevanArmenia Université Libre de Bruxelles BrusselsBelgium Universidade Estadual de Londrina LondrinaBrazil Pontificia Universidade Catolica do Rio de Janeiro Rio de JaneiroBrazil Millennium Institute for SubAtomic Physics at the High-energy Frontier(SAPHIR) ANIDChile Pontificia Universidad Católica de Chile SantiagoChile Beijing Institute of Spacecraft Environment Engineering BeijingChina Beijing Normal University BeijingChina China Institute of Atomic Energy BeijingChina Institute of High Energy Physics BeijingChina North China Electric Power University BeijingChina School of Physics Peking UniversityBeijingChina Tsinghua University BeijingChina University of Chinese Academy of Sciences BeijingChina Jilin University ChangchunChina College of Electronic Science and Engineering National University of Defense TechnologyChangshaChina Chongqing University ChongqingChina Dongguan University of Technology DongguanChina Jinan University GuangzhouChina Sun Yat-sen University GuangzhouChina Harbin Institute of Technology HarbinChina University of Science and Technology of China HefeiChina The Radiochemistry and Nuclear Chemistry Group in University of South China HengyangChina Wuyi University JiangmenChina Shandong University JinanChinaand Key Laboratory of Particle Physics and Particle Irradiation of Ministry of EducationShandong UniversityQingdaoChina Nanjing University NanjingChina Guangxi University NanningChina East China University of Science and Technology ShanghaiChina School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghaiChina Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghaiChina Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuangChina Nankai University TianjinChina Wuhan University WuhanChina Xi'an Jiaotong University Xi'anChina Xiamen University XiamenChina School of Physics and Microelectronics Zhengzhou UniversityZhengzhouChina Institute of Physics National

This paper presents an energy resolution study of the JUNO experiment,incorporating the latest knowledge acquired during the detector construction *** determination of neutrino mass ordering in JUNO requires an exceptional energy resolution better than 3% at 1 *** achieve this ambitious goal,significant efforts have been undertaken in the design and production of the key components of the JUNO *** factors affecting the detection of inverse beta decay signals have an impact on the energy resolution,extending beyond the statistical fluctuations of the detected number of photons,such as the properties of the liquid scintillator,performance of photomultiplier tubes,and the energy reconstruction *** account for these effects,a full JUNO simulation and reconstruction approach is *** enables the modeling of all relevant effects and the evaluation of associated inputs to accurately estimate the energy *** results of this study reveal an energy resolution of 2.95% at 1 ***,this study assesses the contribution of major effects to the overall energy resolution *** analysis serves as a reference for interpreting future measurements of energy resolution during JUNO data ***,it provides a guideline for comprehending the energy resolution characteristics of liquid scintillator-based detectors.

关键词： energy resolution liquid scintillator detector JUNO simulation reconstruction

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