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The effect of Nd-doping on polymorphic behavior and dielectric properties of HfO2: An experimental study and DFT calculation

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Journal of Alloys and Compounds 2025年 1029卷

作者： Banerjee, D. Hazra, Snehamoyee Datta, Subarna Peter, Jipin Biswas, Raju K. Ghosh, Barnali Variable Energy Cyclotron Centre Kolkata700064 India Homi Bhabha National Institute Anushaktinagar Mumbai400094 India Department of Physics Indian Institute of Science Bangalore560012 India Institute of Engineering & Management Sector-V Salt Lake Kolkata700091 India University of Engineering and Management New Town Kolkata700160 India Department of Physics Faculty of Natural Sciences M S Ramaiah University of Applied Sciences Bengaluru560058 India Department of Physics North Eastern Regional Institute of Science and Technology Arunanchal Pradesh Nirjuli791109 India Department of Condensed Matter and Materials Physics S. N. Bose National Centre for Basic Sciences JD Block Sector-III Salt Lake City Kolkata700106 India

A recent observation of ferroelectricity (FE) in thin film of HfO2 has opened up a new possibility of HfO2-based ferroelectric devices. In the present work, the effect of dopant on the phase transformation and dielectric property has been investigated in Neodymium (Nd)-doped HfO2 with various Nd-content. A Density Functional Theory (DFT) based calculation was performed to explain the experimentally observed dielectric properties of different Nd-doped HfO2 compounds. The orthorhombic (o) phase of HfO2 was increasingly stabilized with Nd-content and crystallite size was observed to decrease gradually with increasing dopant. The long-range and short-range ordering in different doped oxide samples were investigated by Rietveld analysis of powder X-ray Diffraction (XRD) pattern and nuclear probe based Time Differential Perturbed γ-γ Angular Correlation (TDPAC) Spectroscopy. Variation of crystallite size with Nd-dopant was followed by Field Emission Scanning Electron Microscopy (FESEM) and Transmission Electron Microscopy (TEM) measurements. The presence of oxygen vacancy was observed by Positron Annihilation Spectroscopy. A gradual enhancement of dielectric constant with increasing Nd-dopant offers significant insights for the future use of HfO2 as ferroelectric devices. © 2025 Elsevier B.V.

关键词： Ferroelectricity

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Accuracy of the TOPSIS Method with Different Input Data 26

Accuracy of the TOPSIS Method with Different Input Data

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26th International Conference on Knowledge-Based and Intelligent Information and Engineering Systems, KES 2022

作者： Król, Robert Wieckowski, Jakub Watróbski, Jaroslaw Doctoral School of University of Szczecin ul. Mickiewicza 16 Szczecin70-383 Poland Research Team on Intelligent Decision Support Systems Department of Artificial Intelligence Methods and Applied Mathematics Faculty of Computer Science and Information Technology West Pomeranian University of Technology Szczecin ul. Zolnierska 49 Szczecin71-210 Poland Institute of Management University of Szczecin ul. Cukrowa 8 Szczecin71-004 Poland

Using fuzzy logic in multi-criteria problems allows real-world problems to be modeled with greater accuracy. In addition, it is possible to solve problems in which all data are incomplete. The difficulty may be the choice of an appropriate technique leading to a ranking calculation. Methods fully integrated with fuzzy logic can be used. It is also possible to convert fuzzy data to crisp values and then apply traditional MCDA methods. In this paper, the performance of the TOPSIS method in a crisp and fuzzy environment was analyzed. The approaches of operating fully on uncertain data when calculating preference values were compared with converting data to crisp values using selected membership functions. The research has shown that significant differences and discrepancies in how the alternatives are classified are noticeable in the rankings. © 2022 The Authors. Published by Elsevier B.V.

关键词： Fuzzy logic

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Comparative analysis of radiation dose distribution in multi-phase tomography angiography procedures

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Radiation physics and Chemistry 2025年 236卷

作者： Elzaki, Maisa Kamal, Eiman Gareeballah, Awadia Alrehily, Faisal A. Osman, Hamid Hamd, Zuhal Y. Khandaker, Mayeen Uddin Department of Diagnostic Radiology College of Applied Medical Sciences Taibah University Madinah Saudi Arabia Faculty of Radiological Sciences and Medical Imaging Alzaiem Alazhari University Khartoum Sudan Department of Radiological Sciences College of Applied Medical Sciences Taif University Taif21944 Saudi Arabia Department of Radiological Sciences College of Health and Rehabilitation Sciences Princess Nourah bint Abdulrahman University P.O. Box 84428 Riyadh11671 Saudi Arabia Applied Physics and Radiation Technologies Group CCDCU Faculty of Engineering and Technology Sunway University 47500 Bandar Sunway Selangor Malaysia Department of Physics College of Science Korea University 145 Anam-ro Seongbuk-gu Seoul02841 Korea Republic of Faculty of Graduate Studies Daffodil International University Daffodil Smart City Birulia Savar Dhaka1216 Bangladesh

Computed tomography angiography (CTA) multi-scan protocols significantly increase radiation exposure due to repeated imaging phases, resulting in higher cumulative doses. This study evaluated radiation dose parameters across three CTA protocols to identify variations and potential optimization strategies. A retrospective analysis was conducted in Khartoum, Sudan, involving 119 adult patients who underwent renal, liver, and lower limb CTA. Radiation dose metrics, including the dose-length product (DLP) and volume CT dose index (CTDIvol), were recorded, and effective dose estimations were performed. The mean CTDI ranged from 5.3 to 8.8 mGy, while the effective dose (ED) spanned from 16.3 to 32.0 mSv, with a mean of 20.9 ± 4.1 mSv. For renal CTA examinations, the total DLP ranged from 809.4 to 2687.9 mGy cm, and the corresponding ED ranged from 12.1 to 40.3 mSv. The findings demonstrate that CTA procedures result in variable radiation exposure depending on the anatomical region scanned and the scanning protocol used, with observed doses often exceeding those reported in previous studies. Continued efforts are needed to refine scanning protocols and minimize unnecessary radiation exposure. © 2025 Elsevier Ltd

关键词： Dosimetry

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Cryptocurrencies Are Becoming Part of the World Global Financial Market

arXiv

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arXiv 2023年

作者： Watorek, Marcin Kwapien, Jaroslaw Drozdz, Stanislaw Faculty of Computer Science and Telecommunications Cracow University of Technology ul. Warszawska 24 Kraków31-155 Poland Complex Systems Theory Department Institute of Nuclear Physics Polish Academy of Sciences Radzikowskiego 152 Kraków31-342 Poland

In this study the cross-correlations between the cryptocurrency market represented by the two most liquid and highest-capitalized cryptocurrencies: bitcoin and ethereum, on the one side, and the instruments representing the traditional financial markets: stock indices, Forex, commodities, on the other side, are measured in the period: January 2020-October 2022. Our purpose is to address the question whether the cryptocurrency market still preserves its autonomy with respect to the traditional financial markets or it has already aligned with them in expense of its independence. We are motivated by the fact that some previous related studies gave mixed results. By calculating the q-dependent detrended cross-correlation coefficient based on the high frequency 10 s data in the rolling window, the dependence on various time scales, different fluctuation magnitudes, and different market periods are examined. There is a strong indication that the dynamics of the bitcoin and ethereum price changes since the March 2020 Covid-19 panic is no longer independent. Instead, it is related to the dynamics of the traditional financial markets, which is especially evident now in 2022, when the bitcoin and ethereum coupling to the US tech stocks is observed during the market bear phase. It is also worth emphasizing that the cryptocurrencies have begun to react to the economic data such as the Consumer Price Index readings in a similar way as traditional instruments. Such a spontaneous coupling of the so far independent degrees of freedom can be interpreted as a kind of phase transition that resembles the collective phenomena typical for the complex systems. Our results indicate that the cryptocurrencies cannot be considered as a safe haven for the financial investments. © 2023, CC BY.

关键词： Degrees of freedom (mechanics)

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Scheduling algorithms in cellular MIMO systems

Scheduling algorithms in cellular MIMO systems

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2021 International Conference Engineering and Telecommunication, En and T 2021

作者： Chernov, Alexey Matyukhin, Vladislav Zherebyatew, Maksim Teleluhin, Artem Bogdanov, Yaroslav Chernova, Julia MIPT-School of Applied Mathematics and Computer Science Moscow Institute of Physics and Technology Moscow Russia MAOU Lyceum 14 Named. Honored Teacher of the Russian Federation A.M. Kuzmina Tambow Russia Gymnasium 69 Named after Sergei Yesenin Lipetsk Russia Moscow State University Faculty of Mechanics and Mathematics Moscow Russia

ISBN: (纸本)9781728183909

In this work, we study the resource allocation problem for downlink in 5G New Radio (NR) mobile networks in the case of orthogonal frequency-division multiple access (OFDMA). One of the key features of 5G mobile networks is the usage of antenna arrays that allows them to form beams in a specific direction and send data to several users at the same transmission time interval (TTI) via the same carrier or resource block (RB). Antenna arrays usually contain up to 64 single antennas. We have been modeled the process of the data transmission from the cell to the user device or user equipment (UE), have been formulated mathematical abstraction of the resource allocation problem, and have been proposed a lightweight algorithm that uses a proportional fair metric. © 2021 IEEE.

关键词： Beamforming

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Zinc allocation to and within Arabidopsis halleri seeds: Different strategies of metal homeostasis in accessions under divergent selection pressure

Plant-Environment Interactions

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Plant-Environment Interactions 2020年第3期1卷 207-220页

作者： Babst-Kostecka, Alicja Przybyłowicz, Wojciech J. Seget, Barbara Mesjasz-Przybyłowicz, Jolanta Department of Environmental Science The University of Arizona Tucson AZ United States Department of Ecology W. Szafer Institute of Botany Polish Academy of Sciences Krakow Poland Faculty of Physics & Applied Computer Science AGH University of Science and Technology Kraków Poland Department of Botany and Zoology Stellenbosch University Matieland South Africa

Vegetative tissues of metal(loid)-hyperaccumulating plants are widely used to study plant metal homeostasis and adaptation to metalliferous soils, but little is known about these mechanisms in their seeds. We explored essential element allocation to Arabidopsis halleri seeds, a species that faces a particular trade-off between meeting nutrient requirements and minimizing toxicity risks. Combining advanced elemental mapping (micro-particle induced X-ray emission) with chemical analyses of plant and soil material, we investigated natural variation in Zn allocation to A. halleri seeds from non-metalliferous and metalliferous locations. We also assessed the tissue-level distribution and concentration of other nutrients to identify possible disorders in seed homeostasis. Unexpectedly, the highest Zn concentration was found in seeds of a non-metalliferous lowland location, whereas concentrations were relatively low in all other seed samples—including metallicolous ones. The abundance of other nutrients in seeds was unaffected by metalliferous site conditions. Our findings depict contrasting strategies of Zn allocation to A. halleri seeds: increased delivery at lowland non-metalliferous locations (a likely natural selection toward enhanced Zn-hyperaccumulation in vegetative tissues) versus limited translocation at metalliferous sites where external Zn concentrations are toxic for non-tolerant plants. Both strategies are worth exploring further to resolve metal homeostasis mechanisms and their effects on seed development and nutrition. © 2020 The Authors. Plant-Environment Interactions published by New Phytologist and John Wiley & Sons Ltd.

关键词： adaptation facultative metallophyte homeostasis metal hyperaccumulation micro-PIXE pseudometallophyte seed Zn allocation

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Investigation of the effectiveness of applying ChatGPT in Dialogic Teaching Using Electroencephalography

arXiv

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arXiv 2024年

作者： Zhang, Jiayue Liu, Yiheng Cai, Wenqi Wu, Lanlan Peng, Yali Yu, Jingjing Qi, Senqing Long, Taotao Ge, Bao School of Physics and Information Technology Shaanxi Normal University Xi’an China School of Psychology Shaanxi Normal University Xi’an China School of Computer Science Shaanxi Normal University Xi’an China Key Laboratory of Modern Teaching Technology Ministry of Education Shaanxi Normal University Xi’an China Faculty of Artificial Intelligence in Education Central China Normal University Wuhan China Key Laboratory of Modern Teaching Technology Ministry of Education School of Physics and Information Technology Shaanxi Normal University Xi’an China

In recent years, the rapid development of artificial intelligence technology, especially the emergence of large language models (LLMs) such as ChatGPT, has presented significant prospects for application in the field of education. LLMs possess the capability to interpret knowledge, answer questions, and consider context, thus providing support for dialogic teaching to students. Therefore, an examination of the capacity of LLMs to effectively fulfill instructional roles, thereby facilitating student learning akin to human educators within dialogic teaching scenarios, is an exceptionally valuable research topic. This research recruited 34 undergraduate students as participants, who were randomly divided into two groups. The experimental group engaged in dialogic teaching using ChatGPT, while the control group interacted with human teachers. Both groups learned the histogram equalization unit in the information-related course "Digital Image Processing". The research findings show comparable scores between the two groups on the retention test. However, students who engaged in dialogue with ChatGPT exhibited lower performance on the transfer test. Electroencephalography data revealed that students who interacted with ChatGPT exhibited higher levels of cognitive activity, suggesting that ChatGPT could help students establish a knowledge foundation and stimulate cognitive activity. However, its strengths on promoting students' knowledge application and creativity were insignificant. Based upon the research findings, it is evident that ChatGPT cannot fully excel in fulfilling teaching tasks in the dialogue teaching in information related courses. Combining ChatGPT with traditional human teachers might be a more ideal approach. The synergistic use of both can provide students with more comprehensive learning support, thus contributing to enhancing the quality of teaching. © 2024, CC BY.

关键词： Students

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Design and implementation of a novel approach for long-lived particle reconstruction in LHCb experiment at CERN

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computer physics Communications 2025年

作者： Piotr Kulczycki Grzegorz Gołaszewski Tomasz Szumlak Szymon Łukasik AGH University of Krakow Faculty of Physics and Applied Computer Science Division for Information Technology and Systems Research Polish Academy of Sciences Systems Research Institute Centre of Information Technology for Data Analysis Methods

The subject of this paper is the improvement of the procedure to reconstruct long-lived particles in the LHCb (Large Hadron Collider beauty) experiment, one of the main experiments conducted by the European Organization for Nuclear Research CERN in Geneva. The goal of this procedure is to detect or, in other words, reconstruct long-lived particle tracks, based on observations obtained from measurement modules placed far apart, with a primary focus of eliminating erroneously created tracks, the so-called ghost-tracks. The investigated method is carried out by pairing proper trajectories and two autonomous filtering algorithms that are based on the nonparametric estimation of a distribution density as well as an autoencoder, a neural network designated for unsupervised learning. The values obtained from these two algorithms founded on complementary methodologies, mathematical statistics and computational intelligence, are combined with the t-norm. As a result, the number of ghost-tracks is reduced threefold when compared with the method primarily used. To evaluate the results of the designed procedure, a measure of the reconstruction quality, without the information whether a given track is real or only a ghost, is additionally created and effectively applied. Illustrative interpretations make it easier to potentially employ the method elaborated here to research tasks of similar conditions.

关键词： data analysis LHCb experiment long-lived particle ghost-track elimination computational intelligence numerical algorithm

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Constrained discounted stochastic games

arXiv

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arXiv 2021年

作者： Jaskiewicz, Anna Nowak, Andrzej S. Faculty of Pure and Applied Mathematics Wroclaw University of Science and Technology Wroclaw Poland Faculty of Mathematics Computer Science and Econometrics University of Zielona Góra Zielona Góra Poland

In this paper, we consider a large class of constrained non-cooperative stochastic Markov games with countable state spaces and discounted cost criteria. In one-player case, i.e., constrained discounted Markov decision models, it is possible to formulate a static optimisation problem whose solution determines a stationary optimal strategy (alias control or policy) in the dynamical infinite horizon model. This solution lies in the compact convex set of all occupation measures induced by strategies, defined on the set of state-action pairs. In case of n-person discounted games the occupation measures are induced by strategies of all players. Therefore, it is difficult to generalise the approach for constrained discounted Markov decision processes directly. It is not clear how to define the domain for the best-response correspondence whose fixed point induces a stationary equilibrium in the Markov game. This domain should be the Cartesian product of compact convex sets in locally convex topological vector spaces. One of our main results shows how to overcome this difficulty and define a constrained non-cooperative static game whose Nash equilibrium induces by a stationary Nash equilibrium in the Markov game. This is done for games with bounded cost functions and positive initial state distribution. An extension to a class of Markov games with unbounded costs and arbitrary initial state distribution relies on approximation of the unbounded game by bounded ones with positive initial state distributions. In the unbounded case, we assume the uniform integrability of the discounted costs with respect to all probability measures induced by strategies of the players, defined on the space of plays (histories) of the game. Our assumptions are weaker than those applied in earlier works on discounted dynamic programming or stochastic games using so-called weighted norm approaches. Copyright © 2021, The Authors. All rights reserved.

关键词： Game theory

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Nontrivial coupling of light into a defect:the interplay of nonlinearity and topology

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Light(science & Applications) 2020年第1期9卷 646-655页

作者： Shiqi Xia Dario Jukic Nan Wang Daria Smirnova Lev Smirnov Liqin Tang Daohong Song Alexander Szameit Daniel Leykam Jingjun Xu Zhigang Chen Hrvoje Buljan The MOE Key Laboratory of Weak-Light Nonlinear Photonics TEDA Applied Physics Institute and School of PhysicsNankai UniversityTianjin 300457China Faculty of Civil Engineering University of ZagrebA.Kacica Miosica 2610000 ZagrebCroatia Nonlinear Physics Centre Research School of PhysicsAustralian National UniversityCanberraACT 2601Australia Institute of Applied Physics Russian Academy of ScienceNizhny Novgorod 603950Russia Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006 ShanxiPR China Institut für Physik Universitat RostockAlbert-Einstein-Strasse 2318059 RostockGermany Center for Theoretical Physics of Complex Systems Institute for Basic Science(IBS)Daejeon 34126Republic of Korea Basic Science Program Korea University of Science and TechnologyDaejeon 34113Republic of Korea Department of Physics and Astronomy San Francisco State UniversitySan FranciscoCA 94132USA Department of Physics Faculty of ScienceUniversity of ZagrebBijenička c.3210000 ZagrebCroatia

The flourishing of topological photonics in the last decade was achieved mainly due to developments in linear topological photonic ***,when nonlinearity is introduced,many intriguing questions *** example,are there universal fingerprints of the underlying topology when modes are coupled by nonlinearity,and what can happen to topological invariants during nonlinear propagation?To explore these questions,we experimentally demonstrate nonlinearity-induced coupling of light into topologically protected edge states using a photonic platform and develop a general theoretical framework for interpreting the mode-coupling dynamics in nonlinear topological *** on laser-written photonic Su-Schrieffer-Heeger lattices,our experiments show the nonlinear coupling of light into a nontrivial edge or interface defect channel that is otherwise not permissible due to topological *** theory explains all the observations ***,we introduce the concepts of inherited and emergent nonlinear topological phenomena as well as a protocol capable of revealing the interplay of nonlinearity and *** concepts are applicable to other nonlinear topological systems,both in higher dimensions and beyond our photonic platform.

关键词： nonlinearity topological coupling

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