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arXiv 2022年

作者： Sun, Zhonghua Ding, Cunsheng Wang, Xiaoqiang School of Mathematics Hefei University of Technology Anhui Hefei230601 China Department of Computer Science and Engineering The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Hubei Key Laboratory of Applied Mathematics Faculty of Mathematics and Statistics Hubei University Wuhan430062 China

Constacyclic codes over finite fields are a family of linear codes and contain cyclic codes as a subclass. Constacyclic codes are related to many areas of mathematics and outperform cyclic codes in several aspects. Hence, constacyclic codes are of theoretical importance. On the other hand, constacyclic codes are important in practice, as they have rich algebraic structures and may have efficient decoding algorithms. In this paper, two classes of constacyclic codes are constructed using a general construction of constacyclic codes with cyclic codes. The first class of constacyclic codes is motivated by the punctured Dilix cyclic codes and the second class is motivated by the punctured generalised Reed-Muller codes. The two classes of constacyclic codes contain optimal linear codes. The parameters of the two classes of constacyclic codes are analysed and some open problems are presented in this paper. Copyright © 2022, The Authors. All rights reserved.

关键词： Forward error correction

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Insights on copper,manganese,and Nickel/ZSM-5 catalytic mechanisms for nitric oxides selective reduction with ammonia

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Carbon Resources Conversion 2022年第1期5卷 15-25页

作者： Cheng Liu Running Kang Feng Bin Xiaolin Wei Kwun Nam Hui Saravanan Kasipandi Kwan San Hui State Key Laboratory of High-Temperature Gas Dynamics Institute of MechanicsChinese Academy of SciencesBeijing 100190PR China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049PR China School of Automobile Engineering Wuhan University of TechnologyWuhan 430070PR China Department of Chemical and Metallurgical Engineering School of Chemical EngineeringAalto UniversityKemistintie 1 P.O.Box 16100Espoo FI-00076Finland Institute of Applied Physics and Materials Engineering University of MacaoAvenida da UniversidadeTaipaMacaoPR China School of Engineering Faculty of ScienceUniversity of East AngliaNorwich Research Park NR47TJUnited Kingdom

The elucidation of the selective catalytic reduction mechanisms over state-of-the-art metal-promoted zeolites is essential for nitric oxides removal in automobile and stationary source *** this work,H/ZSM-5 catalysts modified with transition metals,including copper,manganese,and nickel,were prepared by using an incipient wetness impregnation method and were evaluated for the selective reduction of nitric oxides with *** indicate that copper/ZSM-5 exhibits the highest catalytic activity,with>90%nitric oxide conversion at a broad operation temperature window(221–445◦C).The nitric oxide conversion profiles of nickel/ZSM-5 shows two peaks that correspond to weak activity among the catalysts;the low-temperature peak(290◦C)was induced by nickel clusters dispersed on the ZSM-5 surface,while the high-temperature peak(460◦C)was assigned to the bulk nickel *** size of granular nickel monoxide crystallites with an exposed(202)plane is 2–30 nm,as confirmed by Scanning electron microscopy,X-ray diffraction,and Transmission electron microscope ***-programmed reductions with hydrogen results testified that the copper and nickel cations,as the main species contributing to selective catalytic reduction,were reduced via Cu^(2+)/Cu^(+)→Cu^(0) and Ni^(2+)→Ni^(0) for copper/ZSM-5 and nickel/ZSM-5,respectively,while for the manganese/ZSM5,the Mn3+species in manganese clusters were reduced to Mn^(2+) by ***,temperatureprogrammed desorption coupled with mass spectrometer(TPD-MS)and in situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)were comprehensively used to reveal the relationship between zeolite structure and catalysts’properties for improving selective catalytic *** results confirm that the ammonia is adsorbed and activated on both Brønsted and Lewis acid *** nitrous oxide desorbs in two stages during nitric oxide-TPD-MS measurements,corresponding to the desorption of nitric

关键词： Selective catalytic reduction Transition metals ZSM-5 Reaction mechanism Kinetics

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Status of the operations of CALET for 7.5 years on the International Space Station 38

Status of the operations of CALET for 7.5 years on the Inter...

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38th International Cosmic Ray Conference, ICRC 2023

作者： Tamura, T. Akaike, Y. Kobayashi, K. Adriani, O. Asano, K. Asaoka, Y. Berti, E. Bigongiari, G. Binns, W.R. Bongi, M. Brogi, P. Bruno, A. Cannady, N. Castellini, G. Checchia, C. Cherry, M.L. Collazuol, G. de Nolfo, G.A. Ebisawa, K. Ficklin, A.W. Fuke, H. Gonzi, S. Guzik, T.G. Hams, T. Hibino, K. Ichimura, M. Ioka, K. Ishizaki, W. Israel, M.H. Kasahara, K. Kataoka, J. Kataoka, R. Katayose, Y. Kato, C. Kawanaka, N. Kawakubo, Y. Kohri, K. Krawczynski, H.S. Krizmanic, J.F. Maestro, P. Marrocchesi, P.S. Messineo, A.M. Mitchell, J.W. Miyake, S. Moiseev, A.A. Mori, M. Mori, N. Motz, H.M. Munakata, K. Nakahira, S. Nishimura, J. Okuno, S. Ormes, J.F. Ozawa, S. Pacini, L. Papini, P. Rauch, B.F. Ricciarini, S.B. Sakai, K. Sakamoto, T. Sasaki, M. Shimizu, Y. Shiomi, A. Spillantini, P. Stolzi, F. Sugita, S. Sulaj, A. Takita, M. Tamura, T. Terasawa, T. Torii, S. Tsunesada, Y. Uchihori, Y. Vannuccini, E. Wefel, J.P. Yamaoka, K. Yanagita, S. Yoshida, A. Yoshida, K. Zober, W.V. Kanagawa University Faculty of Engineering Department of Applied Physics 3-27-1 Rokkakubashi Kanagawa-ku Yokohama Japan Department of Physics University of Florence Via Sansone 1 Sesto Fiorentino50019 Italy INFN Sezione di Firenze Via Sansone 1 Sesto Fiorentino50019 Italy Waseda Research Institute for Science and Engineering Waseda University 17 Kikuicho Shinjuku Tokyo162-0044 Japan JEM Utilization Center Human Spaceflight Technology Directorate Japan Aerospace Exploration Agency 2-1-1 Sengen Ibaraki Tsukuba305-8505 Japan Institute for Cosmic Ray Research The University of Tokyo 5-1-5 Kashiwa-no-Ha Kashiwa Chiba277-8582 Japan Via Madonna del Piano 10 Sesto Fiorentino50019 Italy Department of Physical Sciences Earth and Environment University of Siena via Roma 56 Siena53100 Italy INFN Sezione di Pisa Polo Fibonacci Largo B. Pontecorvo 3 Pisa56127 Italy Department of Physics McDonnell Center for the Space Sciences Washington University One Brookings Drive St. LouisMO63130-4899 United States Heliospheric Physics Laboratory NASA GSFC GreenbeltMD20771 United States Center for Space Sciences and Technology University of Maryland Baltimore County 1000 Hilltop Circle BaltimoreMD21250 United States Astroparticle Physics Laboratory NASA GSFC GreenbeltMD20771 United States Center for Research and Exploration in Space Sciences and Technology NASA GSFC GreenbeltMD20771 United States Department of Physics and Astronomy Louisiana State University 202 Nicholson Hall Baton RougeLA70803 United States Department of Physics and Astronomy University of Padova Via Marzolo 8 Padova35131 Italy INFN Sezione di Padova Via Marzolo 8 Padova35131 Italy Institute of Space and Astronautical Science Japan Aerospace Exploration Agency 3-1-1 Yoshinodai Chuo Kanagawa Sagamihara252-5210 Japan Kanagawa University 3-27-1 Rokkakubashi Kanagawa Kanagawa Yokohama221-8686 Japan Faculty of Science and Technology Graduate School of Science a

The CALorimetric Electron Telescope (CALET) has successfully been carrying out cosmic-ray observations on the International Space Station since October, 2015. CALET directly measures the cosmic-ray electron spectrum in the energy range of 1 GeV to 20 TeV with a 2 % energy resolution above 30 GeV. In addition, the instrument can measure the spectrum of gamma rays well into the TeV range, and the spectra of protons and nuclei up to a PeV. The scientific operations are implemented by taking into account orbital variations of geomagnetic rigidity cutoff. Scheduled command sequences are used to control the CALET observation modes on orbit. The high-energy (>10 GeV) trigger mode is always active for maintaining maximum exposure to high-energy electrons and other high-energy shower events. Also, around the ISS orbit, calibration data acquisition by, for example, recording pedestal and penetrating particle events, a low-energy electron trigger mode operating at high geomagnetic latitude, a low-energy gamma-ray trigger mode operating at low geomagnetic latitude, and an ultra-heavy trigger mode, are scheduled. As of June 30, 2023, the total observation time is 2818 days with a live time fraction of the total time around 86 %. Nearly 1.86 billion events are collected with the high-energy trigger. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Cosmology

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Placement Effect of Motion Sensors for Human Activity Recognition using LSTM Network 6

Placement Effect of Motion Sensors for Human Activity Recogn...

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Joint 6th International Conference on Digital Arts, Media and technology with 4th ECTI Northern Section Conference on Electrical, Electronics, computer and Telecommunication Engineering, ECTI DAMT and NCON 2021

作者： Mekruksavanich, Sakorn Jitpattanakul, Anuchit Thongkum, Patcharapan University of Phayao School of Information and Communication Technology Department of Computer Engineering Phayao Thailand King Mongkut's University of Technology North Bangkok Intelligent and Nonlinear Dynamic Innovations Research Center Department of Mathematics Faculty of Applied Science Bangkok Thailand University of Phayao School of Dentistry Phayao Thailand

ISBN: (纸本)9781665415699

There are various possibilities for wearable sensors to determine the recognition of human condition. In order to theoretically drive with wearable sensor technology, several difficult issues have been studied and solved. We currently succeeded in computing the efficient high performance deep learning model for the sensor-based human activity recognition (HAR) there is, however, an influence study challenge regarding the impact of the body-mounted sensor position on the Long Short-Term Memory (LSTM) network. In this work, we propose to conduct several experiments in order to discover the optimal placement for each physical activity the experimental results show that by using heterogeneous sensor data fusion, the chest position is ideal for physical activity identification with a maximum accuracy of 94.18%. © 2021 IEEE.

关键词： Wearable sensors

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Next Generation Image Watermarking via Combined DWT-SVD Technique

Next Generation Image Watermarking via Combined DWT-SVD Tech...

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Cyber Resilience (ICCR), International Conference on

作者： Qais Al-Na'amneh Ammar Almomani Ahmad Nasayreh Khalid M.O. Nahar Hasan Gharaibeh Rabia Emhamed Al Mamlook Mohammad Alauthman Department of Cyber Security Applied Science Private University Amman Jordan School of Computing Skyline University College Sharjah United Arab Emirates I. T. department AlHuson University College AlBalqa Applied University Irbid Jordan Department of Computer Sciences Yarmouk University Irbid Jordan Faculty of Information Technology Computer Sciences Yarmouk University Irbid Jordan Dep. of Business Administration Trine University Indiana USA Dep.of Mechanical and Industrial Engineering University of Zawia Tripoli Libya Department of Information Security Faculty of Information Technology University of Petra Amman Jordan

ISBN: (数字)9798350394962

ISBN: (纸本)9798350394979

Personal computers and the Internet are used in different areas and are easier to use. Most data is easy to transmit and duplicate in digital format, and being tampered with and stolen easily leads to issues for content owners and service providers. The Paper describes a secure (tampering-resistant) method for watermarking images for protection and authentication and digital media like audio, video, and multimedia data, and a combination of singular value decomposition (SVD) and Discrete wavelet transform (DWT) for insertion watermark by MATLAB to increase accuracy, simplicity, and flexibility Readability, secure robustness, and imperceptibility the visibility of the image. The proposed algorithm consists of three main steps: Firstly, we decomposed the original image into four sub-bands and the original watermark. Secondly, embed the watermark in the LL sub-band by replacing the singular value for the watermark. Finally, embed a watermark in the other three sub-bands by adding LL values for a watermark in each sub-band in the original image.

关键词： Resistance PSNR Watermarking Transforms Streaming media Robustness Real-time systems

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Topological Flat-Band-Driven Metallic Thermoelectricity

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Physical Review X 2025年第2期15卷 021054-021054页

作者： Fabian Garmroudi Jennifer Coulter Illia Serhiienko Simone Di Cataldo Michael Parzer Alexander Riss Matthias Grasser Simon Stockinger Sergii Khmelevskyi Kacper Pryga Bartlomiej Wiendlocha Karsten Held Takao Mori Ernst Bauer Antoine Georges Andrej Pustogow Institute of Solid State Physics TU Wien 1040 Vienna Austria Materials Physics Applications—Quantum Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Center for Computational Quantum Physics Flatiron Institute New York 10010 USA International Center for Materials Nanoarchitectonics (WPI-MANA) National Institute for Materials Science Tsukuba 305-0044 Japan University of Tsukuba Tsukuba 305-8577 Japan Dipartimento di Fisica Sapienza University of Rome Piazzale Aldo Moro 5 00185 Roma Italy Vienna Scientific Cluster Research Center TU Wien 1040 Vienna Austria AGH University of Krakow Faculty of Physics and Applied Computer Science Aleja Mickiewicza 30 30-059 Krakow Poland Collège de France PSL University 75005 Paris France Department of Quantum Matter Physics University of Geneva 1211 Geneva Switzerland Centre de Physique Théorique Ecole Polytechnique 91128 Palaiseau France

Materials where flattened electronic dispersions arise from destructive phase interference, rather than localized orbitals, have emerged as promising platforms for studying emergent quantum phenomena. Crucial next steps involve tuning such flat bands to the Fermi level, where they can be studied at low energy scales, and assessing their potential for practical applications. Here, we show that the interplay of highly dispersive and ultraflat bands inherent to these systems can lead to extreme interband scattering-induced electron-hole asymmetry, which can be harnessed in thermoelectrics. Our comprehensive theoretical and experimental investigation of Ni3In1−xSnx kagome metals supports this concept, showing that it could lead to thermoelectric performance on par with state-of-the-art semiconductors such as Bi2Te3. In Ni3In, scattering-induced electron-hole asymmetry is, however, subdued by an exotic conduction mechanism arising from quantum tunneling of charge carriers between Dirac bands, unrelated to the flat band itself. We outline strategies to selectively switch off this tunneling transport through negative chemical pressure or strain. Our study proposes a new direction to explore in topological flat-band systems and vice versa introduces a novel tuning knob for thermoelectric materials.

关键词： Resonant tunneling

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Generation of circularly polarized THz dual pulses

Generation of circularly polarized THz dual pulses

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Conference on Lasers and Electro-Optics (CLEO)

作者： Hao-Keng Wei Hironori Ito Wei-Hong Huang Zai-Wen Chen Ying-Kuan Ko Chien-Ming Tu Atsushi Yabushita Kazuhiko Misawa Chih-Wei Luo Department of Electrophysics National Yang Ming Chiao Tung University Hsinchu Taiwan Graduate Faculty of Interdisciplinary Research Faculty of Engineering University of Yamanashi Yamanashi Japan Department of Applied Physics Tokyo University of Agriculture and Technology Tokyo Japan Department of Biomedical Engineering Tokyo University of Agriculture and Technology Tokyo Japan National Science and Technology Council Taiwan Consortium of Emergent Crystalline Materials (TCECM) Taiwan Institute of Physics and Center for Emergent Functional Matter Science National Yang Ming Chiao Tung University Hsinchu Taiwan National Synchrotron Radiation Research Center Hsinchu Taiwan Department of Physics University of Washington Seattle Washington USA

Circularly polarized THz dual pulses were generated by polarization-twisting optical dual pulses via a modified Michelson interferometer with the turnability of frequency, helicity, and time interval between two pulses.

ISBN: (纸本)9781957171258

关键词： Circular polarization Michelson interferometers Parabolic mirrors Pulse generation Spatial light modulators Wire grid polarizers

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Grain Stresses and Critical Resolved Shear Stresses in Duplex Steel Studied Using Neutron Diffraction and Crystallite Group Method

SSRN

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SSRN 2024年

作者： Baczmański, Andrzej Wroński, Sebastian François, Manuel Le Joncour, Léa Panicaud, Benoit Braham, Chedly Ludwik, Aleksandra Wierzbanowski, Krzysztof Klosek, Vincent AGH University of Kraków Faculty of Physics and Applied Computer Science al. Mickiewicza 30 Kraków30-059 Poland 12 rue Marie Curie Troyes10010 France PIMM 151 Bd de l’Hôpital 75013 Paris France CEA Laboratoire Léon Brillouin Gif-sur-Yvette91191 Cedex France

In this work, a new method for determining the critical resolved shear stress (CRSS) and stress concentration in polycrystalline grains was tested and applied to study the elastic-plastic properties of textured duplex steel. The methodology is based on in situ neutron diffraction measurements of lattice strains during tensile loading. The lattice deformations are measured for several hkl reflections and for different sample orientations with respect to the scattering vector. As a result, the full stress tensor for preferred texture orientations in function of applied stress has been determined using the crystallite group method (CGM). Knowing the experimental values of stresses, the stress concentration tensor is determined. The experimental data are then compared with self-consistent model calculations performed for groups of grains corresponding to the measured hkl reflections. The important advance of the proposed methodology consists in the possibility of estimating the CRSSs directly from measurements, without the use of any elastic-plastic *** the research carried out, on the basis of diffraction measurements, the evolution of grain stresses in preferred orientations in the ferritic and austenitic phases of the tested duplex steel was determined. Using these data, the evolution of the resolved shear stress (RSS) was analysed and, for the first time, CRSS values in both duplex phases were obtained directly from the experimental data. The final results also took into account the influence of initial stresses in the obtained material on the determined CRSSs. © 2024, The Authors. All rights reserved.

关键词： Neutron diffraction

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Josephson effect in a fractal geometry

arXiv

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arXiv 2024年

作者： Amundsen, Morten Juričić, Vladimir Ouassou, Jabir Ali Center for Quantum Spintronics Department of Physics Norwegian University of Science and Technology TrondheimNO-7491 Norway Departamento de Física Universidad Técnica Federico Santa María Casilla 110 Valparaíso Chile Nordita KTH Royal Institute of Technology Stockholm University Hannes Alfvéns väg 12 StockholmSE-106 91 Sweden Department of Computer Science Electrical Engineering and Mathematical Sciences Western Norway University of Applied Sciences HaugesundNO-5528 Norway

The Josephson effect is a hallmark signature of the superconducting state, which, however, has been sparsely explored in non-crystalline superconducting materials. Motivated by this, we consider a Josephson junction consisting of two superconductors with a fractal metallic interlayer, which is patterned as a Sierpiński carpet by removing atomic sites in a self-similar and scale-invariant manner. We here show that the fractal geometry has direct observable consequences on the Josephson effect. In particular, we demonstrate that the form of the supercurrent-magnetic field relation as the fractal generation number increases can be directly related to the self-similar fractal geometry of the normal metallic layer. Furthermore, the maxima of the corresponding diffraction pattern directly encode the self-repeating fractal structure in the course of fractal generation, implying that the corresponding magnetic length directly probes the shortest length scale in the given fractal generation. Our results should motivate future experimental efforts to verify these predictions in designer quantum materials, and motivate future pursuits regarding fractal-based SQUID devices. © 2024, CC BY-NC-ND.

关键词： SQUIDs

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Routing Single Photons from a Trapped Ion Using a Photonic Integrated Circuit

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Physical Review applied 2023年第3期19卷 034001-034001页

作者： Uday Saha James D. Siverns John Hannegan Mihika Prabhu Qudsia Quraishi Dirk Englund Edo Waks Department of Electrical and Computer Engineering University of Maryland College Park Maryland 20742 USA Institute for Research in Electronics and Applied Physics (IREAP) University of Maryland College Park Maryland 20742 USA Department of Physics University of Maryland College Park Maryland 20742 USA Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA United States Army Research Laboratory Adelphi Maryland 20783 USA Joint Quantum Institute (JQI) University of Maryland College Park Maryland 20742 USA

Trapped ions are promising candidates for nodes of a scalable quantum network due to their long-lived qubit coherence times and high-fidelity single- and two-qubit gates. Future quantum networks based on trapped ions will require a scalable way to route photons between different nodes. Photonic integrated circuits from fabrication foundries provide a compact solution to this problem. However, these circuits typically operate at telecommunication wavelengths that are incompatible with the strong dipole emissions of trapped ions. In this work, we demonstrate the routing of single photons from a trapped ion using a photonic integrated circuit. We employ quantum frequency conversion to match the emission of the ion to the operating wavelength of a foundry-fabricated silicon nitride photonic integrated circuit, achieving a total transmission of 31.0% ± 0.9% through the device. Using programmable phase shifters, we switch the single photons between the output channels of the circuit and demonstrate a 50:50 beam splitting condition. These results constitute an important step towards programmable routing and entanglement distribution in large-scale quantum networks and distributed quantum computers.

关键词： Integrated optics Optical quantum information processing Quantum communication Quantum information with trapped ions Quantum interconnects Quantum networks Trapped ions

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