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Waste plastics derived nickel-palladium alloy filled carbon nanotubes for hydrogen evolution reaction

Chemosphere 2023年 341卷 139982页

作者： Nangan, Senthilkumar Natesan, Thirumalaivasan Sukmas, Wiwittawin Okhawilai, Manunya Justice Babu, Kaliyamoorthy Tsuppayakorn-aek, Prutthipong Bovornratanaraks, Thiti Wongsalam, Tawan Vimal, Vrince Uyama, Hiroshi Al-Enizi, Abdullah M. Kansal, Lavish Sehgal, Satbir S. Metallurgy and Materials Science Research Institute Chulalongkorn University Bangkok10330 Thailand Saveetha University Tamilnadu Chennai600077 India Center of Excellence in Polymeric Materials for Medical Practice Devices Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok10330 Thailand Institute of Nano Science and Technology Punjab Mohali140306 India Department of Physics Faculty of Science Chulalongkorn University Bangkok10330 Thailand Computer Science and Engineering Graphic Era Deemed to be University Dehradun248002 India Department of Applied Chemistry Graduate School of Engineering Osaka University Osaka565-0871 Japan Department of Chemistry College of Science King Saud University Riyadh11451 Saudi Arabia School Electronics and Electrical Engineering Lovely Professional University Punjab Phagwara144411 India Division of Research Innovation Uttaranchal University Dehradun India

Carbon nanotubes (CNTs) composed of bimetallic nickel-palladium (NiPd) nanoparticles encapsulated in graphitic carbon shells (NdPd@CNT) are prepared by the chemical vapour deposition method using waste polyethylene terephthalate (PET) plastic carbon sources and NiPd-decorated carbon sheets (NiPd@C) catalyst. The characterization results reveal that the face-centered cubic crystalline (fcc)-structured NiPd bimetallic alloy nanoparticles are encased by thin carbon nanotubes. The bimetallic synergism of NiPd nanoparticles actuates the outer CNT layers and accelerates the electrical conductivity, stimulating the electrochemical activity toward an effective hydrogen evolution reaction (HER). By virtue of the collective individualities of highly conductive aligned carbon walls and bimetallic active sites, the NiPd@CNT-equipped HER delivers a minimum overpotential of 87 mV and a Tafel slope value of 95 mV dec−1. The existing intact contact between NiPd and CNT facilitates continuous electron and ion transportation and firm stability toward long-term hydrogen production in HER. Notably, the NiPd@CNT reported here produces excellent electrochemical activity with minimal charge transference resistance, substantiating the efficacy of NiPd@CNT for futuristic green hydrogen production. © 2023 Elsevier Ltd

关键词： Carbon nanotubes

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Gravitational waves from high-power twisted light

arXiv

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arXiv 2023年

作者： Atonga, Eduard Martineau, Killian Aboushelbaya, Ramy Barrau, Aurélien von der Leyen, Marko Howard, Sunny James, Abigail Lee, Jordan Lin, Chunshan Martin, Heath Ouatu, Iustin Paddock, Robert Ruskov, Rusko Timmis, Robin Norreys, Peter Department of Physics Atomic and Laser Physics sub-Department Clarendon Laboratory University of Oxford Parks Road OxfordOX1 3PU United Kingdom Laboratoire de Physique Subatomique et de Cosmologie Université Grenoble-Alpes CNRS-IN2P3 53 avenue des Martyrs Grenoble38026 cedex France John Adams Institute for Accelerator Science University of Oxford Denys Wilkinson Building Keble Road OxfordOX1 3RH United Kingdom Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Krakow30-348 Poland

Recent advances in high-energy and high-peak-power laser systems have opened up new possibilities for fundamental physics research. In this work, the potential of twisted light for the generation of gravitational waves in the high frequency regime is explored for the first time. Focusing on Bessel beams, novel analytic expressions and numerical computations for the generated metric perturbations and associated powers are presented. The gravitational peak intensity is shown to reach 1.44 × 10−5 W.m−2 close to the source, and 1.01 × 10−19 W.m−2 ten meters away. Compelling evidence is provided that the properties of the generated gravitational waves, such as frequency, polarisation states and direction of emission, are controllable by the laser pulse parameters and optical arrangements. Copyright © 2023, The Authors. All rights reserved.

关键词： Gravitational effects

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Positronium and Quantum Entanglement Imaging: A New Trend in Positron Emission Tomography

Positronium and Quantum Entanglement Imaging: A New Trend in...

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IEEE Symposium on Nuclear science (NSS/MIC)

作者： Pawel Moskal Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Cracow Poland Total-Body Jagiellonian-PET Laboratory Jagiellonian University Cracow Poland Theranostics Center Jagiellonian University Cracow Poland

ISBN: (数字)9781665421133

ISBN: (纸本)9781665421140

We report on the progress in the development of positronium imaging and quantum entanglement imaging achieved thus far by the J-PET collaboration. Positronium (a bound state of electron and positron) is copiously produced in the human body during positron emission tomography. Its properties depend on the size of the intra-molecular voids and concentration in them of molecules as e.g. molecular oxygen. Therefore, positronium may serve as a biomarker of tissue pathology and hypoxia. Recently, the positronium imaging method was developed and the first positronium images of phantoms comprised of tumor cardiac myxoma and healthy adipose tissues were created by means of the J-PET tomograph. A significant difference in mean positronium lifetime in cardiac myxoma and adipose tissues opens promising perspectives for the application of positronium as a cancer diagnostic indicator. It is also important to note that photons originating from the decay of positronium are quantum entangled in polarisation. Thus, it can be hypothesized that by measuring the degree of entanglement of photons from positronium annihilation, additional information can be obtained about the molecular environment in which the positronium is formed. J-PET is the first PET system enabling the determination of linear polarisation of annihilation photons. The measurements performed with the J-PET detector confirm that the distribution of relative angle between the polarization of 511 keV back-to-back photons is consistent with the assumption that these photons are quantum entangled. These results open up prospects for the study of quantum entanglement of photons from positronium annihilation in living organisms.

关键词： Pathology Quantum entanglement Positrons Market research Imaging phantoms Organisms Positron emission tomography

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Optical Spectra Analysis for Transformer Insulation Exposed to Thermal and Electrical Stresses

Optical Spectra Analysis for Transformer Insulation Exposed ...

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2022 9th International Conference on Condition Monitoring and Diagnosis (CMD)

作者： Eman G. Atiya Ahmed E. Elesawy Diaa-Eldin A. Mansour Mohsen Ghali Department of Electrical Power and Machines Engineering Faculty of Engineering Tanta University Tanta Egypt Department of Electrical Power Engineering School of Electronics Communications and Computer Engineering Egypt-Japan University of Science and Technology (E-JUST) New Borg El-Arab City Alexandria Egypt Department of Energy Materials Institute of Basic and Applied Science Egypt-Japan University of Science and Technology (E-JUST) New Borg El-Arab City Alexandria Egypt Physics Department Faculty of Science Kafrelsheikh University Kafrelsheikh Egypt

ISBN: (数字)9784886864314

ISBN: (纸本)9781665470155

Assessment of transformer oil condition reflects its aging extent, which is crucial for their reliable long-term operation. Several techniques have been proposed to assess the condition of transformer oil. Among these techniques, optical spectroscopy proved to be an effective and reliable technique. Herein both Photoluminescence (PL) and Ultraviolet-visible (UV-Vis) spectroscopies were applied to assess the condition of transformer oil exposed to both electrical and thermal stresses with a prim focus on electrical stresses. The accelerated electrical aging system was designed and built to generate arcing faults. Then, an operating voltage was selected to be 70 kV based on withstanding voltage measurements of the fresh oil sample. The investigated electrically and thermally aged oil samples were prepared with different aging levels. After that, both PL and UV-Vis spectra were obtained for electrically and thermally aged samples. It was found that electrical aging caused a shift in the intensity of PL spectra. While the thermally aged ones broaden the PL spectra to longer wavelengths. Regarding UV-Vis spectra, thermal aging affects both the absorbance and wavelength as the maximum absorbance level was increased, and the spectra were shifted to a longer wavelength with aging. Concerning electrical aging, arcing stresses caused a significant change in the absorption level with the aging extent.

关键词： Spectroscopy Oils Aging Oil insulation Optical saturation Optical reflection Circuit faults

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Twin-Array Quasi FSS Reflector with Dual Band Cross-Dipole for 5G Base Station Antenna Application

Twin-Array Quasi FSS Reflector with Dual Band Cross-Dipole f...

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Conference on Power, Energy and Innovations (ICPEI)

作者： Ian Jerome Q. Santos Maleeya Tangjitjetsada Paitoon Rakluea Norakamon Wongsin Chawalit Rakluea Chatree Mahatthanajatuphat Nonchanutt Chudpooti Tawan Thianthong Department of Electronics and Telecommunication Engineering Faculty of Engineering Rajamangala University of Technology Thanyaburi Thanyaburi Pathum Thani Thailand Department of Electronics and Telecommunication Engineering Faculty of Engineering and Architecture Rajamangala University of Technology Suvarnabhumi Nonthaburi Thailand Department of Electrical and Computer Engineering Faculty of Engineering King Mongkut’s University of Technology North Bangkok Wongsawang Bangsue Bangkok Thailand Department of Industrial Physics and Medical Instrumentation Faculty of Applied Science King Mongkut’s University of Technology North Bnagkok Wongsawang Bangsue Bangkok Thailand Siam Airport Ground Service Co. Ltd. Don Mueang Bangkok Thailand

This article provides an explanation of the use of a Twin-Array Quasi Frequency Selective Surface (FSS) Reflector with Dual Band Cross-Dipole for antenna applications in 5G base stations. The base material employed in this study is FR4 sheet, which has a dielectric constant (ε r ) of 4.3. The antenna obtained has dimensions of 100x100 mm 2 and functions throughout the frequency spectrum spanning from 730 to 860 MHz, 1700 to 2130 MHz. The primary benefits of this antenna design are its lightweight structural composition, compatibility with the frequency range of 730–860 MHz, and discernible performance attributes. The CST Studio Suite software was used to conduct a simulation of the antenna’s performance. The antenna has an operating frequency range of 730–860 MHz and 1700–2130 MHz, enabling it to support a unidirectional wave propagation pattern that is suitable for the implementation of a 5G mobile communication base station.

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Antiferromagnetic Hysteresis above the Spin Flop Field

arXiv

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arXiv 2021年

作者： Grzybowski, M.J. Schippers, C.F. Gomonay, O. Rubi, K. Bal, M.E. Zeitler, U. Koziol-Rachwal, A. Szpytma, M. Janus, W. Kurowska, B. Kret, S. Gryglas-Borysiewicz, M. Koopmans, B. Swagten, H.J.M. Department of Applied Physics Eindhoven University of Technology PO Box 513 Eindhoven5600 MB Netherlands Faculty of Physics University of Warsaw Pasteura 5 Warsaw Poland Institute of Physics Johannes Gutenberg-University Mainz Mainz55128 Germany Radboud University Nijmegen6525 ED Netherlands Faculty of Physics and Applied Computer Science AGH University of Science and Technology Kraków30-059 Poland Institute of Physics Polish Academy of Sciences Lotników 32/46 Warsaw Poland

Magnetocrystalline anisotropy is essential in the physics of antiferromagnets and commonly treated as a constant, not depending on an external magnetic field. However, we demonstrate that in CoO the anisotropy should necessarily depend on the magnetic field, which is shown by the spin Hall magnetoresistance of the CoO | Pt device. Below the Néel temperature CoO reveals a spin-flop transition at 240 K at 7.0 T, above which a hysteresis in the angular dependence of magnetoresistance unexpectedly persists up to 30 T. This behavior is shown to agree with the presence of the unquenched orbital momentum, which can play an important role in antiferromagnetic spintronics. © 2021, CC BY.

关键词： Magnetocrystalline anisotropy

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Magnetization reversal driven by electron localization-delocalization crossover in the inverse spinel Co2VO4

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Physical Review B 2022年第9期105卷 094408-094408页

作者： Abhijit Bhat Kademane Churna Bhandari Durga Paudyal Stephen Cottrell Pinaki Das Yong Liu Yuen Yiu C. M. Naveen Kumar Konrad Siemensmeyer Andreas Hoser Diana Lucia Quintero-Castro David Vaknin Rasmus Toft-Petersen Department of Mathematics and Physics Universitetet i Stavanger 4036 Stavanger Norway Ames Laboratory Iowa State University Ames Iowa 50011 USA Department of Electrical and Computer Engineering Iowa State University Ames Iowa 50011 USA ISIS Facility STFC Rutherford Appleton Laboratory Harwell Science and Innovation Campus Chilton Didcot Oxon OX11 0QX United Kingdom Institute of Solid State Physics Vienna University of Technology Wiedner Hauptstrae 810 1040 Vienna Austria AGH University of Science and Technology Faculty of Physics and Applied Computer Science 30-059 Kraków Poland Helmholtz Zentrum Berlin für Materialien und Energie D-14109 Berlin Germany Department of Physics and Astronomy Iowa State University Ames Iowa 50011 USA Department of Physics Technical University of Denmark DK-2800 Kongens Lyngby Denmark European Spallation Source Partikelgatan 2 224 84 Lund Sweden

Neutron diffraction, magnetization, and muon spin relaxation measurements, supplemented by density functional theory (DFT) calculations are employed to unravel temperature-driven magnetization reversal in inverse spinel Co2VO4. All measurements show a second-order magnetic phase transition at TC=168K to a collinear ferrimagnetic phase. Neutron diffraction measurements reveal two antiparallel ferromagnetic (FM) sublattices, belonging to magnetic ions on two distinct crystal lattice sites, where the relative balance between the two sublattices determine the net FM moment in the unit cell. As the evolution of the ordered moment with temperature differs between the two sublattices, the net magnetic moment reaches a maximum at TNC=138K and reverses its sign at TMR=65K. The DFT results suggest that the underlying microscopic mechanism for the reversal is a delocalization of the unfilled 3d-shell electrons on one sublattice just below TC, followed by a gradual localization as the temperature is lowered. This delocalized-localized crossover is supported by muon spectroscopy results, as strong T1 relaxation observed below TC indicates fluctuating internal fields.

关键词： Density of states Ferrimagnetism Metal-insulator transition Oxides Spinels Density functional calculations Magnetization measurements Muon spin relaxation & rotation Neutron scattering

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Financial Fraud Detection using Quantum Graph Neural Networks

arXiv

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arXiv 2023年

作者： Innan, Nouhaila Sawaika, Abhishek Dhor, Ashim Dutta, Siddhant Thota, Sairupa Gokal, Husayn Patel, Nandan Khan, Muhammad Al-Zafar Theodonis, Ioannis Bennai, Mohamed Quantum Physics and Magnetism Team LPMC Faculty of Sciences Ben M’sick Hassan II University of Casablanca Morocco Quantum Formalism Fellow Zaiku Group Ltd Liverpool United Kingdom Indian Institute of Technology Bombay India Department of Data Science and Engineering Indian Institute of Science Education and Research Bhopal India Dwarkadas J. Sanghvi College of Engineering India Guru Nanak Institutions Technical Campus Hyderabad India ASTI Academy Dubai United Arab Emirates Vellore Institute of Technology Chennai India School of Computer Science and Applied Mathematics University of the Witwatersrand 1 Jan Smuts Ave Braamfontein Johannesburg Gauteng2000 South Africa Department of Physics School of Applied Mathematical and Physical Sciences National Technical University of Athens Greece

Financial fraud detection is essential for preventing significant financial losses and maintaining the reputation of financial institutions. However, conventional methods of detecting financial fraud have limited effectiveness, necessitating the need for new approaches to improve detection rates. In this paper, we propose a novel approach for detecting financial fraud using Quantum Graph Neural Networks (QGNNs). QGNNs are a type of neural network that can process graph-structured data and leverage the power of Quantum Computing (QC) to perform computations more efficiently than classical neural networks. Our approach uses Variational Quantum Circuits (VQC) to enhance the performance of the QGNN. In order to evaluate the efficiency of our proposed method, we compared the performance of QGNNs to Classical Graph Neural Networks using a real-world financial fraud detection dataset. The results of our experiments showed that QGNNs achieved an AUC of 0.85, which outperformed classical GNNs. Our research highlights the potential of QGNNs and suggests that QGNNs are a promising new approach for improving financial fraud detection. © 2023, CC BY.

关键词： Timing circuits

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Deep Generative Models for Fast Photon Shower Simulation in ATLAS

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Computing and Software for Big science 2024年第1期8卷 1-40页

作者： Aad, G. Abbott, B. Abbott, D.C. Abud, A. Abed Abeling, K. Abhayasinghe, D.K. Abidi, S.H. Aboulhorma, A. Abramowicz, H. Abreu, H. Abulaiti, Y. Hoffman, A. C. Abusleme Acharya, B.S. Achkar, B. Adam, L. Bourdarios, C. Adam Adamczyk, L. Adamek, L. Addepalli, S.V. Adelman, J. Adiguzel, A. Adorni, S. Adye, T. Affolder, A.A. Afik, Y. Agaras, M.N. Agarwala, J. Aggarwal, A. Agheorghiesei, C. Aguilar-Saavedra, J.A. Ahmad, A. Ahmadov, F. Ahmed, W.S. Ai, X. Aielli, G. Aizenberg, I. Akbiyik, M. Åkesson, T.P.A. Akimov, A.V. Khoury, K. Al Alberghi, G.L. Albert, J. Albicocco, P. Verzini, M. J. Alconada Alderweireldt, S. Aleksa, M. Aleksandrov, I.N. Alexa, C. Alexopoulos, T. Alfonsi, A. Alfonsi, F. Alhroob, M. Ali, B. Ali, S. Aliev, M. Alimonti, G. Allaire, C. Allbrooke, B.M.M. Allport, P.P. Aloisio, A. Alonso, F. Alpigiani, C. Camelia, E. Alunno Estevez, M. Alvarez Alviggi, M.G. Coutinho, Y. Amaral Ambler, A. Ambroz, L. Amelung, C. Amidei, D. Santos, S. P. Amor Dos Amoroso, S. Amos, K.R. Amrouche, C.S. Ananiev, V. Anastopoulos, C. Andari, N. Andeen, T. Anders, J.K. Andrean, S.Y. Andreazza, A. Angelidakis, S. Angerami, A. Anisenkov, A.V. Annovi, A. Antel, C. Anthony, M.T. Antipov, E. Antonelli, M. Antrim, D.J.A. Anulli, F. Aoki, M. Pozo, J. A. Aparisi Aparo, M.A. Bella, L. Aperio Appelt, C. Aranzabal, N. Ferraz, V. Araujo Arcangeletti, C. Arce, A.T.H. Arena, E. Arguin, J.-F. Argyropoulos, S. Arling, J.-H. Armbruster, A.J. Arnaez, O. Arnold, H. Tame, Z. P. Arrubarrena Artoni, G. Asada, H. Asai, K. Asai, S. Asbah, N.A. Asimakopoulou, E.M. Assahsah, J. Assamagan, K. Astalos, R. Atkin, R.J. Atkinson, M. Atlay, N.B. Atmani, H. Atmasiddha, P.A. Augsten, K. Auricchio, S. Austrup, V.A. Avner, G. Avolio, G. Ayoub, M.K. Azuelos, G. Babal, D. Bachacou, H. Bachas, K. Bachiu, A. Backman, F. Badea, A. Bagnaia, P. Bahmani, M. Bailey, A.J. Bailey, V.R. Baines, J.T. Bakalis, C. Baker, O.K. Bakker, P.J. Bakos, E. Gupta, D. Bakshi Balaji, S. Balasubramanian, R. Baldin, E.M. Balek, P. Ballabene, E. Balli, F. Baltes, L.M. Balunas, W.K. Balz, J. Banas Department of Physics University of Adelaide Adelaide Australia Department of Physics University of Alberta Edmonton AB Canada Department of Physics Ankara University Ankara Turkey Division of Physics TOBB University of Economics and Technology Ankara Turkey LAPP Université Savoie Mont Blanc CNRS/IN2P3 Annecy France APC Université Paris Cité CNRS/IN2P3 Paris France High Energy Physics Division Argonne National Laboratory Argonne IL United States Department of Physics University of Arizona Tucson AZ United States Department of Physics University of Texas at Arlington Arlington TX United States Physics Department National and Kapodistrian University of Athens Athens Greece Physics Department National Technical University of Athens Zografou Greece Department of Physics University of Texas at Austin Austin TX United States Institute of Physics Azerbaijan Academy of Sciences Baku Azerbaijan Institut de Física d’Altes Energies (IFAE) Barcelona Institute of Science and Technology Barcelona Spain Institute of High Energy Physics Chinese Academy of Sciences Beijing China Physics Department Tsinghua University Beijing China Department of Physics Nanjing University Nanjing China University of Chinese Academy of Science (UCAS) Beijing China Institute of Physics University of Belgrade Belgrade Serbia Department for Physics and Technology University of Bergen Bergen Norway Physics Division Lawrence Berkeley National Laboratory Berkeley CA United States Institut für Physik Humboldt Universität zu Berlin Berlin Germany Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics University of Bern Bern Switzerland School of Physics and Astronomy University of Birmingham Birmingham United Kingdom Department of Physics Bogazici University Istanbul Turkey Department of Physics Engineering Gaziantep University Gaziantep Turkey Department of Physics Istanbul University Istanbul Turkey Istinye University Sariyer Istanbul

The need for large-scale production of highly accurate simulated event samples for the extensive physics programme of the ATLAS experiment at the Large Hadron Collider motivates the development of new simulation techniques. Building on the recent success of deep learning algorithms, variational autoencoders and generative adversarial networks are investigated for modelling the response of the central region of the ATLAS electromagnetic calorimeter to photons of various energies. The properties of synthesised showers are compared with showers from a full detector simulation using geant4. Both variational autoencoders and generative adversarial networks are capable of quickly simulating electromagnetic showers with correct total energies and stochasticity, though the modelling of some shower shape distributions requires more refinement. This feasibility study demonstrates the potential of using such algorithms for ATLAS fast calorimeter simulation in the future and shows a possible way to complement current simulation techniques. © The Author(s) 2024.

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Design of Monopole Transparent Antenna for Satellite Internet Aboard Aircraft

Design of Monopole Transparent Antenna for Satellite Interne...

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13th International Electrical Engineering Congress, iEECON 2025

作者： Thianthong, Tawan Sangpet, Patchadaporn Mahatthanajatuphat, Chatree Tangthong, Nipont Rakluea, Chawalit Chudpooti, Nonchanutt Jangjing, Thinnawat Khongchon, Supphakon Siam Airport Ground Services Co. Ltd. 431/57 Song Prapha Rd. Don Mueang Bangkok10210 Thailand Thanyaburi Pathum Thani 12110 Thailand King Mongkut's University of Technology North Bangkok Faculty of Engineering Department of Electrical and Computer Engineering 1518 Pracharat 1 Rd.Wongsawang Bangsue Bangkok10800 Thailand King Mongkut's University of Technology North Bangkok Faculty of Applied Science Department of Industrial Physics and Medical Instrumentation 1518 Pracharat 1 Rd.Wongsawang Bangsue Bangkok10800 Thailand

ISBN: (纸本)9798331543952

This research presents the design of a transparent antenna for satellite internet aboard aircraft. The presented antenna comprises a triangular arrow monopole antenna fed by a tapered microstrip transmission line. It employs a polycarbonate composite substrate with a dielectric constant (ϵr) of 2.8 and a thickness (h) of 1 mm. The proposed transparent antenna achieves a bandwidth in the frequency range of 10.42-22.70 GHz, with an omnidirectional radiation pattern and an average gain of 2.57 dBi, effectively covering the Ku band for satellite internet applications. The antenna design was simulated using electromagnetic wave CST simulation software, and a prototype antenna was fabricated. The designed antenna exhibits a reflection coefficient of less than -10 dB throughout the 10.7-12.7 GHz frequency range, which is the operational frequency range for satellite internet and is an acceptable value in research terms. Moreover, a conductor with a thickness of 0.035 mm sits on a composite substrate material to form the antenna structure for satellite internet aboard aircraft. We need to study and apply various techniques to further enhance the antenna's performance in future designs. © 2025 IEEE.

关键词： Monopole antennas

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