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2nd International Conference on Space Weather and Satellite Application, ICeSSAT 2020

作者： Rosli, N.I.M. Hamid, N.S.A. Abdullah, M. Yoshikawa, A. Department of Applied Physics Faculty of Science and Technology Universiti Kebangsaan Malaysia UKM Bangi Selangor43600 Malaysia Institute of Climate Change Universiti Kebangsaan Malaysia UKM Bangi Selangor43600 Malaysia Department of Electrical Electronics and Systems Engineering Universiti Kebangsaan Malaysia UKM Bangi Selangor43600 Malaysia International Center for Space Weather Science and Education Kyushu University Fukuoka812-8581 Japan

A negative decrement in geomagnetic data in equatorial region is not necessarily cause by the well-known counter electrojet, CEJ but it is also can be affected by solar activity such as a solar flare. Relying on this matter, we did a comparison between CEJ and unusual solar flare effect called as SFE∗ on geomagnetic data before introducing several types of CEJ that can be extracted from EUEL index. This study used ground data from MAGDAS network located in Langkawi (LKW) with 1-minutes resolution during solar cycle 24 and applied EUEL index. From the results, it is crucial to ensure the minimum duration of EUEL depletion is within an hour because less than an hour depletion could be possibly cause by solar activity. Four interval of time that has been introduced in our study composed of several types of CEJ which are morning CEJ, afternoon CEJ and evening CEJ, with additional the controversial CEJ occurrence which is night CEJ. We also successfully demonstrated a rare CEJ occurrence that associated with solar flare effect using EUEL index. © 2021 Published under licence by IOP Publishing Ltd.

关键词： Solar energy

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How the Apriori Algorithm Can Help to Find Semantic Duplicates in Ontology 1

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作者： Astrova, Irina Koschel, Arne Lee, Su Ling Department of Software Science School of IT Tallinn University of Technology Akadeemia tee 21 Tallinn12618 Estonia Faculty IV Department of Computer Science University of Applied Sciences and Arts Hannover Ricklinger Stadtweg 120 Hannover30459 Germany

ISBN: (数字)9783030539498

ISBN: (纸本)9783030539481;9783030539511

Ontology-based data integration attempts to overcome the semantic heterogeneity problem in data integration. Semantic heterogeneity refers to an ambiguous interpretation of terms that describes the meaning of data in heterogeneous resources. However, the presence of semantic duplicates such as similar attributes in the integrated ontologies can lead to incomplete query results. This paper proposes to use the Apriori algorithm from market basket analysis to find similar attributes in an ontology. © 2020, Springer Nature Switzerland AG.

关键词： Data integration

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Fuzzy sets complement-based Gated Recurrent Unit 13

Fuzzy sets complement-based Gated Recurrent Unit

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13th International Workshop on Fuzzy Logic and Applications, WILF 2021

作者： Ferrero-Jaurrieta, Mikel Dimuro, Graçaliz Pereira Takáč, Zdenko Santiago, Regivan H.N. Fernández, Javier Bustince, Humberto Department of Statistics Computer Science and Mathematics Public University of Navarre Campus Arrosadía s/n Pamplona31006 Spain Centro de Ciências Computacionais Universidade Federal do Rio Grande Rio Grande 96044540 Brazil Institute of Information Engineering Automation and Mathematics Faculty of Chemical and Food Technology Slovak University of Technology in Bratislava Radlinského 9 Bratislava812 37 Slovakia Department of Computer Science and Applied Mathematics Universidade Federal do Rio Grande do Norte Natal1524 Brazil

Gated Recurrent Units (GRU) are neural network gated architectures that simplify other ones (such as, LSTM) by joining gates mainly. For this, instead of using two gates, if x is the first gate, standard operation 1 − x is used to generate the second one, optimizing the number of parameters. In this work, we interpret this information as a fuzzy set, and we generalize the standard operation using fuzzy negations, and improving the accuracy obtained with the standard one. © 2021 Copyright for this paper by its authors. Use permitted under Creative Commons License Attribution 4.0 International (CC BY 4.0). CEUR Workshop Proceedings (***)

关键词： Fuzzy sets

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Quartic multifractality and finite-size corrections at the spin quantum Hall transition

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Physical Review B 2021年第23期103卷 235167-235167页

作者： Martin Puschmann Daniel Hernangómez-Pérez Bruno Lang Soumya Bera Ferdinand Evers Institute of Theoretical Physics University of Regensburg D-93053 Regensburg Germany Department of Molecular Chemistry and Material Science Weizmann Institute of Science Rehovot 7610001 Israel IMACM and Institute of Applied Computer Science Bergische Universität Wuppertal D-42119 Wuppertal Germany Department of Physics Indian Institute of Technology Bombay Mumbai 400076 India

The spin quantum Hall transition (or class C transition in two dimensions) represents one of the few localization-delocalization transitions for which some of the critical exponents are known exactly. Not known, however, is the multifractal spectrum τq, which describes the system-size scaling of inverse participation ratios Pq, i.e., the q moments of critical wave-function amplitudes. We here report simulations based on the class C Chalker-Coddington network and demonstrate that τq is (essentially) a quartic polynomial in q. Analytical results fix all prefactors except the quartic curvature that we obtain as γ=(2.22±0.15)×10−3. In order to achieve the necessary accuracy in the presence of sizable corrections to scaling, we have analyzed the evolution with system size of the entire Pq-distribution function. As it turns out, in a sizable window of q values this distribution function exhibits a (single-parameter) scaling collapse already in the preasymptotic regime, where finite-size corrections are not negligible. This observation motivates us to propose new, original approach for extracting τq based on concepts borrowed from the Kolmogorov-Smirnov test of mathematical statistics. We believe that our work provides the conceptual means for high-precision investigations of multifractal spectra also near other localization-delocalization transitions of current interest, especially the integer (class A) quantum Hall effect.

关键词： Anderson localization Quantum criticality Quantum phase transitions Spin Hall effect Topological phases of matter Critical exponents Finite-size scaling Network Models Numerical techniques

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Natural formation of protective film for mild steel corrosion in sodium chloride containing saturated carbon dioxide medium using lanthanum (III) chloride

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Colloids and Surfaces A: Physicochemical and Engineering Aspects 2025年 721卷

作者： Dao, Thi-Bich-Ngoc Duong-Ngo, Kim-Long Huynh, Thanh Liem Tran, Thanh-Nha Pham, Thanh Trung Kim, Minji Nguyen, Thi Nhung Nguyen Dang, Nam Future Materials & Devices Lab. Institute of Fundamental and Applied Sciences Duy Tan University Ho Chi Minh City70000 Viet Nam Faculty of Civil Engineering Duy Tan University Danang55000 Viet Nam Graduate University of Science and Technology Vietnam Academy of Science and Technology Hanoi10000 Viet Nam Thu Dau Mot University 6 Tran Van On Street Phu Hoa Ward Binh Duong Thu Dau Mot820000 Viet Nam Department of Physics University of Namur 61 Rue de Bruxelles NamurB-5000 Belgium Department of Semiconductor Process Korea Polytechnic University 56 Munemi-ro 448beon-gil Bupyeong-gu Incheon21417 Korea Republic of Department of Physics School of Applied Sciences REVA University Bangalore560064 India

Carbon dioxide (CO2) corrosion on metallic materials, especially mild steel, is the major concern to various industrial sectors as continuously exposed to different environmental conditions, which causes damages related to loss of materials, environment and finance. Finding an effective method to improve corrosion resistance, enhance durability, and even reduce maintenance costs for mild steel-based components is always an urgent requirement. Beyond increased applicability and extended lifespan of steel-based infrastructures, maintaining sustainability and environmental friendliness of the methods used is relatively important. Motivated by this direction, this work uses lanthanum (III) chloride (LaCl3) as a corrosion inhibitor on mild steel in the 0.01 M NaCl solution saturated with CO2. By combining surface characterizations and electrochemical measurements, electrochemical behaviors of mild steel and the effects of the inhibitor on electrochemical activities of steel are clearly demonstrated. Surface characterizations including scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS) are applied to observe and analyze the steel surface after immersion in the prepared solution without and with varying concentrations of the inhibitor for 72 hours. The results show the film formation of lanthanum-based compounds on the steel surface probably reduces localized corrosion and minimizes porous flakes on the steel surface. Additionally, the electrochemical measurements, including potentiodynamic polarization (PD) and electrochemical impedance spectroscopy (EIS), indicate that LaCl3 acts a mixed-type inhibitor that prevents both anodic and cathodic reactions on the metal surface in the electrolyte, with the highest inhibition efficiency achieving 95.97 ± 0.41% at 2.4 mM LaCl3. The film formation of the inhibitor based on the heterogenous monolayer adsorption is demonstrated by isotherm adsorption. Moreover, the wi

关键词： Pitting

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NEAR-IR SPECTRAL OBSERVATIONS OF THE DIDYMOS SYSTEM - DAILY EVOLUTION BEFORE AND AFTER THE DART IMPACT, INDICATES DIMORPHOS ORIGINATED FROM DIDYMOS

arXiv

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arXiv 2023年

作者： Polishook, David DeMeo, Francesca E. Burt, Brian J. Thomas, Cristina A. Rivkin, Andrew S. Sanchez, Juan A. Reddy, Vishnu Faculty of Physics Weizmann Institute of Science Rehovot0076100 Israel Department of Earth Atmospheric and Planetary Sciences Massachusetts Institute of Technology 77 Massachusetts Avenue CambridgeMA02139 United States Lowell Observatory 1400 West Mars Hill Road FlagstaffAZ86001 United States Northern Arizona University Department of Astronomy and Planetary Science PO Box 6010 FlagstaffAZ86011 United States The Johns Hopkins University Applied Physics Laboratory LaurelMD United States Planetary Science Institute TucsonAZ United States University of Arizona TucsonAZ United States

Ejecta from Dimorphos following the DART mission impact, significantly increased the brightness of the Didymos-Dimorphos system, allowing us to examine sub-surface material. We report daily near-IR spectroscopic observations of the Didymos system using NASA’s IRTF, that follow the evolution of the spectral signature of the ejecta cloud over one week, from one day before the impact. Overall, the spectral features remained fixed (S-type classification) while the ejecta dissipated, confirming both Didymos and Dimorphos are constructed from the same silicate material. This novel result strongly supports binary asteroid formation models that include breaking up of a single body, due to rotational breakup of km-wide bodies. At impact time +14 and +38 hours, the spectral slope decreased, but following nights presented increasing spectral slope that almost returned to the pre-impact slope. However, the parameters of the 1 µm band remained fixed, and no"fresh" / Q-type-like spectrum was measured. We interpret these as follow: 1. The ejecta cloud is the main contributor (60 - 70%) to the overall light during the ∼ 40 hours after impact. 2. Coarser debris (≥ 100 µm) dominated the ejecta cloud, decreasing the spectral slope (after radiation pressure removed the fine grains at ≤ 10 hours after impact);3. after approximately one week, the ejecta cloud dispersed enough to make the fine grains on Didymos surface the dominating part of the light, increasing the spectral slope to pre-impact level. 4. a negligible amount of non-weathered material was ejected from Dimorphos’ sub-surface, suggesting Dimorphos was accumulated from weathered material, ejected from Didymos surface. © 2023, CC BY.

关键词： Asteroids

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Corrigendum: Conductance response of graphene nanoribbons and quantum point contacts in scanning gate measurements (2015 Semicond. Sci. Technol. 30 085003)

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Semiconductor science and technology 2022年第4期37卷 049501-049501页

作者： Alina Mreńca-Kolasińska Krzysztof Kolasiński Bartłomiej Szafran AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. Mickiewicza 30 30-059 Kraków Poland

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Preoperative Personalized Vascular 3D Simulator of the Intelligent Robotic Ecosystem LevshAI for Endovascular Neurosurgery

Preoperative Personalized Vascular 3D Simulator of the Intel...

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International Conference on Autonomous Robots and Agents, ICARA

作者： Ivan Menshikov Kirill Orlov Vadim Berestov Alexandra Bernadotte Neurosputnik LLC Moscow Institute of Physics and Technology (MIPT) Moscow Russia Russia Endovascular Neuro Society (RENS) Research Center of Endovascular Neurosurgery Federal State Budgetary Institution “Federal Center of Brain Research and Neurotechnologies” of the Federal Medical Biological Agency Moscow Russia Faculty of Mechanics and Mathematics Faculty of Computer Sciences Moscow State University The National University of Science and Technology MISIS Higher School of Economics * - Major contribution Russia

The paper presented a Personalized Intelligent Vascular 3D Simulator as an essential part of the Intelligent Robotic Ecosystem LevshAI for remote endovascular neurosurgery. The training LevshAI is equipped with intelligent haptic feedback and Personalized 3D Simulator. The simulator creates a unique personal vascular architecture according to the individual patient parameters obtained from the medical images. The Personalized 3D Simulator allows surgeons to practice on the simulator and choose the best tactics before the operation - personalized surgery. The feedback and simulator of the LevshAI system provide a training environment identical to what a surgeon would experience in an operating room. The simulator is based on proposed segmentation and reconstruction algorithms. The presented algorithms are fully automated and can be applied to any imaging modality. The simulator has passed a preclinical study on both Computed Tomography Angiography and Magnetic Resonance Angiography data. The Personalized Intelligent Vascular 3D Simulator can be applied to (1) personalized surgery; (2) automated screening for cerebrovascular risks in healthy people.

关键词： Training Three-dimensional displays Angiography Ecosystems Phantoms Magnetic resonance Reconstruction algorithms

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Symmetries and integrals of motion of a superintegrable deformed oscillator

arXiv

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arXiv 2020年

作者： Gonera, Joanna Jasiński, Artur Kosiński, Piotr Department of Computer Science Faculty of Physics and Applied Informatics University of Lodz Poland

The symmetry structure of twodimensional nonlinear isotropic oscillator, introduced in Physica D237 (2008) 505, is discussed. It is shown that it possesses three independent integrals of motion which can be chosen in such a way that they span SU(2), E(2) or SU(1,1) algebras, depending on the value of total energy. They generate the infinitesimal canonical symmetry transformations;integrability of the latter is analyzed. The results are then generalized to the case of arbitrary number of degrees of freedom. Copyright © 2020, The Authors. All rights reserved.

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Temperature Dependence of the Anisotropy of the Infrared Dielectric Properties and Phonon-Plasmon Coupling in N-Doped 4h-Sic

SSRN

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SSRN 2023年

作者： Kazan, Michel Zgheib, C. Bruyant, A. Wu, K.-T. El-Helou, Y. Rahbany, N. Chahal, J. Department of Physics American University of Beirut PO Box 11-0236 Riad El-Solh Beirut1107-2020 Lebanon Light Nanomaterials and Nanotechnology University of Technology of Troyes CNRS ERL 7004 Troyes10004 France Department of Physics National Central University Taoyuan32001 Taiwan Molecular Science and Technology Program Taiwan International Graduate Program Institute of Atomic and Molecular Science Academia Sinica Taipei10617 Taiwan Faculty of Natural Sciences & Applied Sciences Notre Dame University-Louaize PO Box 72 Zouk Mosbeh Lebanon

Polarized infrared reflectivity spectroscopy was used to measure the temperature dependence of the anisotropy of the infrared dielectric properties and coupling between phonon and plasmon modes in n-doped 4H-SiC. The advantage of polarized infrared spectroscopy over the commonly used Raman spectroscopy is that it enables dielectric, plasmonic, and transport properties to be probed along and perpendicular to the c-axis, which is impossible with Raman spectroscopy because of its selection rules. In addition, the infrared spectrum, comparatively rare in Raman spectroscopy, can be described at high temperatures using simple classical theory, providing more precise information on the material’s properties. Analysis of the s- and p-polarized infrared reflectivity spectra of an n-doped 4H-SiC substrate shows that the strength and damping of the oscillators, the response of the bound electrons to infrared excitation, the effective ion mass, and the transverse frequency and anharmonicity of the phonons of n-doped 4H-SiC are temperature-sensitive and strongly anisotropic. It also shows that the plasmonic properties of n-doped 4H-SiC, namely the relaxation time and collective oscillation frequency of free electrons, are also highly anisotropic and, owing to the long relaxation time of free electrons in the direction parallel to the c-axis, only the axial longitudinal phonon-plasmon modes split into low-frequency and high-frequency modes at temperatures above 700 K. © 2023, The Authors. All rights reserved.

关键词： Anisotropy

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