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The Crystal and Electronic Structure of Re23co7in20 (Re = Gd–Tm, Lu): A New Structure Type Based on Intergrowth of Alb2- and Cscl-Type Related Slabs

SSRN

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SSRN 2023年

作者： Tyvanchuk, Yuriy Babizhetskyy, Volodymyr Baran, Stanislaw Szytula, Andrzej Smetana, Volodymyr Lee, Sangjoon Oliynyk, Anton O. Mudring, Anja-Verena Department of Inorganic Chemistry Ivan Franko National University of Lviv Kyryla and Mefodiya 6 Lviv79005 Ukraine Jagiellonian University Doctoral School of Exact and Natural Sciences Faculty of Physics Astronomy and Applied Computer Science Prof. Stanislawa Lojasiewicza 11 KrakówPL-30-348 Poland Stockholm University Sweden Department of Biological and Chemical Engineering and iNANO Aarhus University Åbogade 40 Aarhus N8200 Denmark Department of Applied Physics and Applied Mathematics Columbia University New YorkNY10027 United States Department of Chemistry Hunter College City University of New York New YorkNY10065 United States

New ternary rare-earth indides RE23Co7In20 (RE = Gd–Tm, Lu) have been synthesized by arc-melting the elements under argon and subsequent annealing at 870 K for 1200 h. Single-crystal X-ray diffraction revealed Er23Co7In20 to crystallize in a new structure type in oP100, space group Pbam and Wyckoff sequence h11g13da with a = 23.203(5), b = 28.399(5), c = 3.5306(6) Å. The crystal structures of RE23Co7In20 (RE = Tb, Ho, Er and Tm) were determined from single crystal and powder X-ray diffraction data and further investigated by DFT methods. The compounds belong to a large family of ternary rare-earth indides with intergrowth of the AlB2- and CsCl-type related slabs. In the Er23Co7In20 structure, four types of fragments REIn and RET of CsCl-type, as well as RET2 and REIn2 of AlB2- type, are present simultaneously. A simple Python tool was developed to determine the coordination number for each crystallographic site with various methods and tested on the complex structure of RE23Co7In20 © 2023, The Authors. All rights reserved.

关键词： Electronic structure

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Non-homotopic loops with a bounded number of pairwise intersections

arXiv

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arXiv 2021年

作者： Blažej, Václav Opler, Michal Šileikis, Matas Valtr, Pavel Faculty of Information Technology Czech Technical University in Prague Prague Czech Republic Computer Science Institute Charles University Prague Czech Republic The Czech Academy of Sciences Institute of Computer Science Prague Czech Republic Dept. of Applied Mathematics Faculty of Mathematics and Physics Charles University Prague Czech Republic

Let Vn be a set of n points in the plane and let x ∈/ Vn. An x-loop is a continuous closed curve not containing any point of Vn. We say that two x-loops are non-homotopic if they cannot be transformed continuously into each other without passing through a point of Vn. For n = 2, we give an upper bound eO(√k) on the maximum size of a family of pairwise non-homotopic x-loops such that every loop has fewer than k self-intersections and any two loops have fewer than k intersections. The exponent O(√k) is asymptotically tight. The previous upper bound bound 2(2k)4 was proved by Pach, Tardos, and Tóth [Graph Drawing 2020]. We prove the above result by proving the asymptotic upper bound eO(√k) for a similar problem when x ∈ Vn, and by proving a close relation between the two *** Codes 05C62, 05C10 Copyright © 2021, The Authors. All rights reserved.

关键词： Drawing (graphics)

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Exploring the integration of multi criteria decision analysis in the clean energy biodiesels applications: A systematic review and gap analysis

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Engineering Applications of Artificial Intelligence 2024年 133卷

作者： Alamoodi, A.H. Garfan, Salem Al-Zuhairi, Omar Zaidan, B.B. Zaidan, A.A. Albahri, O.S. Y.Y. Ahmaro, Ibraheem Albahri, A.S. Yussof, Salman Magableh, Aws A. Institute of Informatics and Computing in Energy Universiti Tenaga Nasional Malaysia Hourani Center for Applied Scientific Research Al-Ahliyya Amman University Amman19328 Jordan Perak Malaysia Applied Science Research Center Applied Science Private University Amman Jordan Low Dimensional Materials Research Centre Department of Physics Faculty of Science Universiti Malaya Kuala Lumpur50603 Malaysia SP Jain School of Global Management Lidcombe SydneyNSW2141 Australia International Graduate School of Artificial Intelligence National Yunlin University of Science and Technology Douliu Taiwan Victorian Institute of Technology Australia Computer Techniques Engineering Department Mazaya University College Nasiriyah Iraq Computer Science Department College of Information Technology Hebron University Hebron Palestine Technical College Imam Ja'afar Al-Sadiq University Baghdad Iraq Department of Information Systems Yarmouk University Irbid Jordan Baghdad Iraq Department of Computing College of Computing and Informatics Universiti Tenaga Nasional Malaysia Departments of Software Engineering Prince Sultan University Riyad Saudi Arabia

Biodiesel has gained tremendous attention from researchers due to its environmentally friendly and renewable fuel manufactured domestically from vegetable oils or animal fats. Multiple factors, including emission and fuel efficiency, measure the performance of biodiesel. These characteristics make the process of evaluation and benchmarking a multi-criteria decision-making (MCDM) problem. This research attempts to survey the literature for multi-criteria decision-making applications on biodiesel. This systematic review was carried out on four scientific databases: PubMed, scienceDirect, IEEE Xplore, and WoS. The collected articles were summarized and mapped into a coherent taxonomy, while the main challenges, motivations, and recommendations were collected and categorized for better understanding and finding out essential characteristics. The final set of included articles was 33, and they were categorized into six different categories. Most articles (n=15/33) investigated the evaluation and selection of biodiesel alternatives using MCDM. Furthermore, a state-of-art bibliometric analysis is provided. The analysis demonstrates several challenges in this area, such as source selection, optimum fuel blending, and uncertainty. This article is expected to assist future researchers in addressing the current gaps and contribute to advancing this area. © 2024 Elsevier Ltd

关键词： Biodiesel

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Quantum Corrections to the Decay Law in Flight

arXiv

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arXiv 2024年

作者： Ramírez Jiménez, D.F. Guerrero Parra, A.F. Kelkar, Neelima G. Nowakowski, M. M. Smoluchowski Institute of Physics Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University KrakówPL-30348 Poland Departamento de Física Universidad de los Andes Cra. 1E No. 18A-10 Bogotá Colombia IFT-UNESP Rua Bento Teobaldo Ferraz 271 Bloco 2 SP São Paulo01140-070 Brazil Universidade Federal de São Paulo São PauloC.P. 01302-907 Brazil

The deviation of the decay law from the exponential is a well known effect of quantum mechanics. Here we analyze the relativistic survival probabilities, S(t, p), where p is the momentum of the decaying particle and provide analytical expressions for S(t, p) in the exponential (E) as well as the nonexponential (NE) regions at small and large times. Under minimal assumptions on the spectral density function, analytical expressions for the critical times of transition from the NE to the E at small times and the E to NE at large times are derived. The dependence of the decay law on the relativistic Lorentz factor, γ = 1/p1 − v2/c2, reveals several interesting features. In the short time regime of the decay law, the critical time, τst, shows a steady increase with γ, thus implying a larger NE region for particles decaying in flight. Comparing S(t, p) with the well known time dilation formula, e−Γt/γ, in the exponential region, an expression for the critical γ where S(t, p) deviates most from e−Γt/γ is presented. This is a purely quantum correction. Under particular conditions on the resonance parameters, there also exists a critical γ at large times which decides if the NE region shifts backward or forward in time as compared to that for a particle at rest. All the above analytical results are supported by calculations involving realistic decays of hadrons and leptons. Copyright © 2024, The Authors. All rights reserved.

关键词： Relativity

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Non-invasive brain stimulation-based sleep stage classification using transcranial infrared based electrocardiogram

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Neuroscience Informatics 2025年第2期5卷 100197-100197页

作者： Ramesh, Janjhyam Venkata Naga Quraishi, Aadam Aoudni, Yassine Mudhafar, Mustafa Nimma, Divya Bansal, Monika Department of Computer Science and Engineering Koneru Lakshmaiah Education Foundation Vaddeswaram Guntur Andhra Pradesh 522302 India M.D. Research Intervention Treatment Institute Houston TX United States Computer & Embedded Systems Laboratory National School of Engineers of Sfax (ENIS) University of Sfax BP 1173 Sfax 3038 Tunisia Department of Medical Physics Faculty of Medical Applied Sciences University of Kerbala Karbala 56001 Iraq Department of Anesthesia Techniques and Intensive Care Al-Taff university college Kerbala 56001 Iraq Data Analyst in UMMC United States Department of Computer Science SSD Women's Institute of Technology Bathinda India

Non-invasive brain stimulation (NIBS) techniques, such as transcranial infrared (tNIR) stimulation, offer promising advancements in sleep monitoring and regulation. To enhance sleep stage classification without relying on traditional polysomnography (PSG) systems, we propose a novel approach integrating single-channel electrocardiogram (ECG) signals, heart rate variability (HRV) features, and tNIR stimulation. The maximal overlap discrete wavelet transform (MODWT) is applied for multi-resolution analysis of ECG signals, followed by peak information extraction. Based on the first-order deviation of peak positions, multi-dimensional HRV features are extracted. To identify HRV features strongly associated with different sleep stages, we introduce a feature selection method combining the ReliefF algorithm and Gini index. The selected features are then processed using the INFO-ABC Logit Boost method to establish correlations between HRV dynamics and sleep stages. Experimental results on publicly available datasets demonstrate that the proposed model achieves an overall accuracy of 83.67%, a precision of 82.59%, a Kappa coefficient of 77.94%, and an F1-score of 82.97%. Compared with conventional sleep staging methods, our approach enhances sleep quality assessment and facilitates real-time, non-invasive monitoring in home and mobile healthcare settings, leveraging the potential of tNIR-based NIBS for sleep modulation. © 2025 The Author(s)

关键词： ECG Healthcare HRV Non-invasive brain stimulation tNIR

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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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Length Scales in Brownian yet Non-Gaussian Dynamics

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Physical Review X 2021年第3期11卷 031002-031002页

作者： José M. Miotto Simone Pigolotti Aleksei V. Chechkin Sándalo Roldán-Vargas Leiden Institute of Advanced Computer Science 2333 CA Leiden Netherlands Biological Complexity Unit Okinawa Institute for Science and Technology and Graduate University Onna Okinawa 904-0495 Japan Institute for Physics and Astronomy University of Potsdam 14476 Potsdam-Golm Germany Akhiezer Institute for Theoretical Physics Kharkov 61108 Ukraine Max Planck Institute for the Physics of Complex Systems 01187 Dresden Germany Department of Applied Physics Faculty of Sciences University of Granada 18071 Granada Spain

According to the classical theory of Brownian motion, the mean-squared displacement of diffusing particles evolves linearly with time, whereas the distribution of their displacements is Gaussian. However, recent experiments on mesoscopic particle systems have discovered Brownian yet non-Gaussian regimes where diffusion coexists with an exponential tail in the distribution of displacements. Here we show that, contrary to the present theoretical understanding, the length scale λ associated with this exponential distribution does not necessarily scale in a diffusive way. Simulations of Lennard-Jones systems reveal a behavior λ∼t1/3 in three dimensions and λ∼t1/2 in two dimensions. We propose a scaling theory based on the idea of hopping motion to explain this result. In contrast, simulations of a tetrahedral gelling system, where particles interact by a nonisotropic potential, yield a temperature-dependent scaling of λ. We interpret this behavior in terms of an intermittent hopping motion. Our findings link the Brownian yet non-Gaussian phenomenon with generic features of glassy dynamics and open new experimental perspectives on the class of molecular and supramolecular systems whose dynamics is ruled by rare events.

关键词： Brownian motion Collective behavior Diffusion Gels Glassy systems Liquids Extreme event statistics Molecular dynamics

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Magnon interactions in a moderately correlated Mott insulator

arXiv

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arXiv 2023年

作者： Wang, Qisi Mustafi, S. Fogh, E. Astrakhantsev, N. He, Z. Bialo, I. Chan, Ying Martinelli, L. Horio, M. Ivashko, O. Shaik, N.E. von Arx, K. Sassa, Y. Paris, E. Fischer, M.H. Tseng, Y. Christensen, N.B. Galdi, A. Schlom, D.G. Shen, K.M. Schmitt, T. Rønnow, H.M. Chang, J. Department of Physics The Chinese University of Hong Kong Shatin Hong Kong Physik-Institut Universität Zürich Winterthurerstrasse 190 ZürichCH-8057 Switzerland LausanneCH-1015 Switzerland Beijing100049 China Dongguan523803 China AGH University of Krakow Faculty of Physics and Applied Computer Science Krakow30-059 Poland Department of Applied Physics KTH Royal Institute of Technology StockholmSE-106 91 Sweden Swiss Light Source Paul Scherrer Institut PSI VilligenCH-5232 Switzerland Department of Physics Technical University of Denmark Kongens LyngbyDK-2800 Denmark Dipartimento di Ingegneria Industriale Universita' degli Studi di Salerno SA Fisciano84084 Italy Department of Materials Science and Engineering Cornell University IthacaNY14850 United States Kavli Institute Cornell for Nanoscale Science IthacaNY14853 United States Department of Physics Laboratory of Atomic and Solid State Physics Cornell University IthacaNY14853 United States

Quantum fluctuations in low-dimensional systems and near quantum phase transitions have significant influences on material properties. Yet, it is difficult to experimentally gauge the strength and importance of quantum fluctuations. Here we provide a resonant inelastic x-ray scattering study of magnon excitations in Mott insulating cuprates. From the thin film of SrCuO2, single- and bi-magnon dispersions are derived. Using an effective Heisenberg Hamiltonian generated from the Hubbard model, we show that the single-magnon dispersion is only described satisfactorily when including significant quantum corrections stemming from magnon-magnon interactions. Comparative results on La2CuO4 indicate that quantum fluctuations are much stronger in SrCuO2 suggesting closer proximity to a magnetic quantum critical point. Monte Carlo calculations reveal that other magnetic orders may compete with the antiferromagnetic Néel order as the ground state. Our results indicate that SrCuO2-due to strong quantum fluctuations-is a unique starting point for the exploration of novel magnetic ground states. Copyright © 2023, The Authors. All rights reserved.

关键词： Strontium compounds

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Non-relativistic Strings: Classical solutions and exactly solvable models

arXiv

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arXiv 2025年

作者： Banerjee, Aritra Chakraborty, Adrita Padhi, Nibedita Birla Institute of Technology and Science Pilani Campus Rajasthan Pilani333031 India Faculty of Physics and Applied Computer Science AGH University of Krakow al. A. Mickiewicza 30 Krakow30-059 Poland Department of Physics Indian Institute of Technology Kharagpur721302 India

We discuss classical closed string solutions in non-relativistic two-sphere target spaces. These classes of solutions closely relate to the GKP-type, spinning and pulsating strings for the relativistic case. We derive the string dynamics in each case and construct relevant dispersion relations, both from the string Newton-Cartan intrinsic sigma model and using a large speed of light expansion of relativistic Polyakov action. We further discuss construction and characteristics of exactly solvable Neumann-Rosochatius-like dynamical systems corresponding to strings in leading and subleading orders of the expanded Polyakov theory. Copyright © 2025, The Authors. All rights reserved.

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Cosmic superstrings revisited in light of NANOGrav 15-year data

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Physical Review D 2023年第10期108卷 103511-103511页

作者： John Ellis Marek Lewicki Chunshan Lin Ville Vaskonen Kings College London Strand London WC2R 2LS United Kingdom Theoretical Physics Department CERN CH-1211 Geneva 23 Switzerland Faculty of Physics University of Warsaw ul. Pasteura 5 02-093 Warsaw Poland Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University 30-348 Kraków Poland Keemilise ja Bioloogilise Füüsika Instituut Rävala pst. 10 10143 Tallinn Estonia Dipartimento di Fisica e Astronomia Università degli Studi di Padova Via Marzolo 8 35131 Padova Italy Istituto Nazionale di Fisica Nucleare Sezione di Padova Via Marzolo 8 35131 Padova Italy

We analyze cosmic superstring models in light of NANOGrav 15-year pulsar timing data. A good fit is found for a string tension Gμ∼10−12–10−11 and a string intercommutation probability p∼10−3–10−1. Extrapolation to higher frequencies assuming standard big bang cosmology is compatible at the 68% CL with the current LIGO/Virgo/KAGRA upper limit on a stochastic gravitational wave background in the 10 to 100 Hz range. The superstring interpretation of the NANOGrav data would be robustly testable by future experiments even in modified cosmological scenarios.

关键词： Cosmic strings & domain walls Gravitational waves

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