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Is Blockchain for Internet of Medical Things a Panacea for COVID-19 Pandemic?

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arXiv 2022年

作者： Li, Xuran Tao, Bishenghui Dai, Hong-Ning Imran, Muhammad Wan, Dehuan Li, Dengwang Shandong Key Laboratory of Medical Physics and Image Processing School of Physics and Electronics Shandong Normal University Shandong Jinan China Faculty of Information Technology Macau University of Science and Technology Macau China College of Applied Computer Science King Saud University Riyadh Saudi Arabia Guangdong University of Finance Guangzhou China

The outbreak of the COVID-19 pandemic has deeply influenced the lifestyle of the general public and the healthcare system of the society. As a promising approach to address the emerging challenges caused by the epidemic of infectious diseases like COVID-19, Internet of Medical Things (IoMT) deployed in hospitals, clinics, and healthcare centers can save the diagnosis time and improve the efficiency of medical resources though privacy and security concerns of IoMT stall the wide adoption. In order to tackle the privacy, security, and interoperability issues of IoMT, we propose a framework of blockchain-enabled IoMT by introducing blockchain to incumbent IoMT systems. In this paper, we review the benefits of this architecture and illustrate the opportunities brought by blockchain-enabled IoMT. We also provide use cases of blockchain-enabled IoMT on fighting against the COVID-19 pandemic, including the prevention of infectious diseases, location sharing and contact tracing, and the supply chain of injectable medicines. We also outline future work in this area. © 2022, CC BY-NC-SA.

关键词： Blockchain

Improved Maximum Angle Estimate for Longest-Edge Bisection

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International Journal of Computational Geometry and Applications 2021年第4期31卷 183-192页

作者： Korotov, Sergey Lund, Lars Fredrik Vatne, Jon Eivind Division of Mathematics and Physics Ukk Mälardalen University Box 883 Västerås 721 23 Sweden Department of Computer Science Electrical Engineering and Mathematical Sciences Faculty of Engineering and Science Western Norway University of Applied Sciences Postbox 7030 Bergen 5020 Norway Department of Economics Norwegian Business School (BI) Kong Christian Frederiks plass 5 Bergen 5006 Norway

In this note we construct an upper estimate on the maximum angles of triangles generated by the longest-edge bisection algorithms applied to a triangle. This upper bound considerably improves upon one inherited from the well-known minimum angle estimation, thus providing tighter two-sided estimation of the angles generated by bisections. This estimate also guarantees the validity of the maximum angle condition, widely used in finite element analysis and computer graphics. © 2021 World Scientific Publishing Company.

关键词： Finite element method Longest-edge bisection Maximum angle condition Mesh refinement

Non-Gaussian transverse momentum fluctuations from impact parameter fluctuations

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Physical Review C 2023年第2期108卷 024908-024908页

作者： Rupam Samanta João Paulo Picchetti Matthew Luzum Jean-Yves Ollitrault AGH University of Science and Technology Faculty of Physics and Applied Computer Science aleja Mickiewicza 30 30-059 Cracow Poland Université Paris Saclay CNRS CEA Institut de Physique Théorique 91191 Gif-sur-Yvette France Instituto de Física Universidade de São Paulo Rua do Matão 1371 Butantã 05508-090 São Paulo Brazil

The transverse momentum per particle, [pt], fluctuates event by event in ultrarelativistic nucleus-nucleus collisions, for a given multiplicity. These fluctuations are small and approximately Gaussian, but a nonzero skewness has been predicted on the basis of hydrodynamic calculations, and seen experimentally. We argue that the mechanism driving the skewness is that, if the system thermalizes, the mean transverse momentum increases with impact parameter for a fixed collision multiplicity. We postulate that fluctuations are Gaussian at fixed impact parameter, and that non-Gaussianities solely result from impact parameter fluctuations. Using recent data on the variance of [pt] fluctuations, we make quantitative predictions for their skewness and kurtosis as a function of the collision multiplicity. We predict, in particular, a spectacular increase of the skewness below the knee of the multiplicity distribution, followed by a fast decrease.

关键词： Particle correlations & fluctuations Relativistic heavy-ion collisions

Kinetics of transformation, border of metastable miscibility gap in Fe-Cr alloy and limit of Cr solubility in iron at 858 K

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arXiv 2022年

作者： Dubiel, Stanislaw M. Żukrowski, Jan AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. A. Mickiewicza 30 Kraków30-059 Poland AGH University of Science and Technology Academic Center for Materials and Nanotechnology al. A. Mickiewicza 30 Kraków30-059 Poland

The study was aimed at determination of the position of the Fe-rich border of the metastable miscibility gap (MMG) and of the solubility limit of Cr in iron at 858 K. Towards this end a Fe73.7Cr26.3 alloy was isothermally annealed at 858 K in vacuum up to 8144 hours and Mössbauer spectra were recorded at room temperature after every step of the annealing. Three spectral parameters viz. the average hyperfine field, , the average isomer shift, , and the probability of the atomic configuration with no Cr atoms in the two-shell vicinity of the probe Fe atoms, P(0,0), gave evidence that the transformation process takes place in two stages. All three parameters could have been well described in terms of the Johnson-Mehl-Avrami-Kolmogorov equation, yielding kinetics parameters. The first stage, associated with the phase decomposition, proceeded much faster than the second stage, associated with the alpha-to-sigma phase transformation. The most reliable estimation of the position of the MMG and that of the value of the Cr solubility limit was obtained from the annealing time dependence of , namely 24.5 at.% Cr for the former and 20.3 at.% Cr for the latter. A comparison of these figures with the recent phase diagrams pertinent to Fe-Cr system was done. © 2022, CC BY-NC-ND.

关键词： Binary alloys

Interplay between the extended s-wave symmetry of the gap and the spin-orbit coupling in the low-electron concentration regime of quasi-two-dimensional superconductors

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arXiv 2022年

作者： Zegrodnik, Michal Wójcik, P. Academic Centre for Materials and Nanotechnology AGH University of Science and Technology Al. Mickiewicza 30 Krakow30-059 Poland AGH University of Science and Technology Faculty of Physics and Applied Computer Science Krakow30-059 Poland Al. Mickiewicza 30 Krakow30-059 Poland

We analyze the real-space paired state with the k-dependent superconducting gap in the presence of Rashba type spin-orbit coupling and external magnetic field. We show that the extended s-wave pairing symmetry is the most probable scenario to appear in the low-electron concentration regime. According to our study, the van Hove singularity induced by the spin-orbit coupling may lead to a significant enhancement of the superconducting gap, critical temperature and critical magnetic field. Moreover, the combined effect of the spin-orbit coupling and the external magnetic field results in a non-zero total momentum of the Cooper pairs, which is a characteristic feature of the so-called helical state. In such situation, due to the C4 symmetry breaking, a small d-wave and p-wave contributions to the pairing appear, which significantly change the character of the helical state. The obtained results are discussed in the context of the experimental data related with the unconventional superconducting features of the transition metal oxide interfaces as well as the recently reported supercurrent diode effect. Copyright © 2022, The Authors. All rights reserved.

关键词： Transition metals

Light transport in 3-dimensional hyperuniform dielectric networks

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Light transport in 3-dimensional hyperuniform dielectric net...

Frontiers in Optics, FIO 2019 - Part of Frontiers in Optics + Laser science APS/DLS

作者： Haberko, Jakub Froufe-Pérez, Luis S. Scheffold, Frank Faculty of Physics and Applied Computer Science AGH University of Science and Technology al. Mickiewicza 30 Krakow30-059 Poland Department of Physics University of Fribourg Chemin du Musée 3 Fribourg1700 Switzerland

Hyperuniform structures are characterized by a specific type of short-range order. This results in the emergence of a photonic band gap for sufficiently large refractive index. Here we study light transport properties... 详细信息

ISBN: (纸本)9781943580675

关键词： Photonic band gap

Comparative studies of plastic scintillator strips with high technical attenuation length for the total-body J-PET scanner

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arXiv 2024年

作者： Kaplon, L. Baran, J. Chug, N. Coussat, A. Curceanu, C. Czerwiński, E. Dadgar, M. Dulski, K. Gajewski, J. Gajos, A. Hiesmayr, B. Valsan, E. Kavya Klimaszewski, K. Korcyl, G. Kozik, T. Krzemień, W. Kumar, D. Moskal, G. Niedźwiecki, S. Panek, D. Parzych, S. del Rio, E. Pérez Raczyński, L. Ruciński, A. Sharma, S. Shivani, S. Shopa, R. Silarski, M. Skurzok, M. Stępień, E. Ardebili, F. Tayefi Ardebili, K. Tayefi Wiślicki, W. Moskal, P. Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Lojasiewicza 11 Krakow30-348 Poland Total-Body Jagiellonian-PET Laboratory Jagiellonian University Lojasiewicza 11 Krakow30-348 Poland Center for Theranostics Jagiellonian University Krakow Poland INFN Laboratori Nazionali di Frascati Frascati00044 Italy Institute of Nuclear Physics Polish Academy of Sciences Radzikowskiego 152 Krakow31-342 Poland Faculty of Physics University of Vienna Vienna1090 Austria Department of Complex Systems National Centre for Nuclear Research Otwock-Swierk05-400 Poland High Energy Physics Division National Centre for Nuclear Research Otwock-Swierk05-400 Poland Faculty of Chemistry The Jagiellonian University Gronostajowa 2 Krakow30-387 Poland

Plastic scintillator strips are considered as one of the promising solutions for the cost-effective construction of total-body positron emission tomography (PET) system. The purpose of the performed measurements is to compare the transparency of long plastic scintillators with dimensions 6 mm × 24 mm × 1000 mm and with all surfaces polished. Six different types of commercial, general purpose, blue-emitting plastic scintillators with low attenuation of visible light were tested, namely: polyvinyl toluene-based BC-408, EJ-200, RP-408, and polystyrene-based Epic, SP32 and UPS-923A. For determination of the best type of plastic scintillator for total-body Jagiellonian positron emission tomograph (TB-J-PET) construction, emission and transmission spectra, and technical attenuation length (TAL) of blue light-emitting by the scintillators were measured and compared. The TAL values were determined with the use of UV lamp as excitation source, and photodiode as light detector. Emission spectra of investigated scintillators have maxima in the range from 420 nm to 429 nm. The BC-408 and EJ-200 have the highest transmittance values of about 90% at the maximum emission wavelength measured through a 6 mm thick scintillator strip and the highest technical attenuation length reaching about 2000 mm, allowing assembly of long detection modules for time-of-flight (TOF) J-PET scanners. Influence of the 6 mm x 6 mm, 12 mm x 6 mm, 24 mm x 6 mm cross-sections of the 1000 mm long EJ-200 plastic scintillator on the TAL and signal intensity was measured. The highest TAL value was determined for samples with 24 mm x 6 mm cross-section. © 2024, CC BY.

关键词： Positrons

Instability of oscillations in the Rosenzweig-MacArthur model of one consumer and two resources

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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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Cosmic rays and the structure of the universe studied in Cosmic Ray Extremely Distributed Observatory with citizen science 37

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Cosmic rays and the structure of the universe studied in Cos...

37th International Cosmic Ray Conference, ICRC 2021

作者： Kamiński, Robert Firla, Janusz Stuglik, Slawomir Castillo, David Alvarez Budnev, Nikolay Bar, Olaf Bibrzycki, Lukasz Gupta, Alok Chandra Hnatyk, Bohdan Homola, Piotr Karbowiak, Michal Kasztelan, Marcin Kovacs, Peter Lozowski, Bartosz Medvedev, Mikhail Mozgova, Alona Niedźwiecki, Michal Piekarczyk, Marcin Rosas, Matias Rzecki, Krzysztof Smelcerz, Katarzyna Smolek, Karel Stasielak, Jaroslaw Sushchov, Oleksandr Svanidze, Manana Tursunov, Arman Verbetsky, Yuri Wibig, Tadeusz Zamora-Saa, Jilberto Institute of Nuclear Physics Polish Academy of Sciences Radzikowskiego 152 Kraków31-342 Poland CREDO Project Irkutsk State University Russia Pedagogical University of Cracow Podchorżych 2 Kraków30-084 Poland Manora Peak Nainital263001 India Astronomical Observatory of Taras Shevchenko National University of Kyiv Kyiv04053 Ukraine University of Lodz Faculty of Physics and Applied Informatics Pomorska 149/153 Lódź90-236 Poland National Centre for Nuclear Research Andrzeja Soltana 7Świerk Otwock05-400 Poland Wigner Research Centre for Physics Konkoly-Thege Miklós út 29-33. BudapestH-1121 Hungary Faculty of Natural Sciences University of Silesia in Katowice Bankowa 9 Katowice40-007 Poland Department of Physics and Astronomy University of Kansas LawrenceKS66045 United States Laboratory for Nuclear Science Massachusetts Institute of Technology CambridgeMA02139 United States Department of Computer Science Faculty of Computer Science and Telecommunications Cracow University of Technology Warszawska 24 Kraków31-155 Poland Liceo 6 Francisco Bauzá Montevideo Uruguay AGH University of Science and Technology Mickiewicz Ave. Kraków30-059 Poland Institute of Experimental and Applied Physics Czech Technical University Prague Czech Republic E. Andronikashvili Institute of Physics under Tbilisi State University Georgia Research Centre for Theoretical Physics and Astrophysics Institute of Physics Silesian University in Opava Bezručovo nám. 13 OpavaCZ-74601 Czech Republic Universidad Andres Bello Departamento de Ciencias Fisicas Facultad de Ciencias Exactas Avenida Republica 498 Santiago Chile

The CREDO project aims to observe sets of simultaneous global air showers, i.e. covering the entire hemisphere of the Earth. To do this, it is necessary to deploy detectors of various sizes as densely as possible across the globe. These observations are intended to help answer some basic questions of astrophysics, such as the occurrence and nature of dark matter, the sources of high-energy particles, and the structure of space-time. The method of work of the CREDO project is citizen science, i.e. participation in the project activities not only of scientists but also students, adults, organized groups of enthusiasts and individuals interested in the topic. This community also includes people with disabilities, e.g. visually impaired or blind. The synergy of these two tasks of CREDO - science and education of the society, results in an increasing and wider territorial participation of outsiders in the activities of the project and a very rapid scientific development of the project. The following text presents two aspects of the CREDO project - scientific and educational, and the state of art of the project for June 2021. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0)

关键词： Cosmic rays