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arXiv 2021年

作者： Bac, S.-K. Koller, K. Lux, F. Wang, J. Riney, L. Borisiak, K. Powers, W. Zhukovskyi, M. Orlova, T. Dobrowolska, M. Furdyna, J.K. Dilley, N.R. Rokhinson, L.P. Mokrousov, Y. McQueeney, R.J. Heinonen, O. Liu, X. Assaf, Badih A. Department of Physics University of Notre Dame Notre DameIN46556 United States Institute of Physics Johannes Gutenberg University Mainz Mainz55099 Germany Notre Dame Integrated Imaging Facility University of Notre Dame Notre DameIN46556 United States Peter Grünberg Institut Institute for Advanced Simulation Forschungszentrum Jülich and JARA Jülich52425 Germany Ames Laboratory AmesIA50011 United States Materials Science Division Argonne National Laboratory LemontIL60439 United States Birck Nanotechnology Center Purdue University West LafayetteIN47907 United States Department of Physics and Astronomy Purdue University West LafayetteIN47907 United States Department of Electrical and Computer Engineering Purdue University West LafayetteIN47907 United States

Three-dimensional (3D) compensated MnBi2Te4 is antiferromagnetic, but undergoes a spin-flop transition at intermediate fields, resulting in a canted phase before saturation. In this work, we experimentally show that the anomalous Hall effect (AHE) in MnBi2Te4 originates from a topological response that is sensitive to the perpendicular magnetic moment and to its canting angle. Synthesis by molecular beam epitaxy allows us to obtain a large-area quasi-3D 24-layer MnBi2Te4 with near-perfect compensation that hosts the phase diagram observed in bulk which we utilize to probe the AHE. This AHE is seen to exhibit an antiferromagnetic response at low magnetic fields, and a clear evolution at intermediate fields through surface and bulk spin-flop transitions into saturation. Throughout this evolution, the AHE is super-linear versus magnetization rather than the expected linear relationship. We reveal that this discrepancy is related to the canting angle, consistent with the symmetry of the crystal. Our findings bring to light a topological anomalous Hall response that can be found in non-collinear ferromagnetic, and antiferromagnetic phases. Copyright © 2021, The Authors. All rights reserved.

关键词： Magnetic moments

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A Grid based Approach for Handwritten Text Segmentation

A Grid based Approach for Handwritten Text Segmentation

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IEEE Southeastcon

作者： Soumalya Ghosh Umesh Kumar Gupta Uttam Ghosh Sachin Shetty School of Computing Science and Engineering Galgotias University Greater Noida Uttar Pradesh India Department of Electrical Engineering & Computer Science Vanderbilt University Nashville TN USA Virginia Modeling Analysis and Simulation Center Old Dominion University Norfolk VA USA

ISBN: (数字)9781728101378

ISBN: (纸本)9781728101385

The hand-written text is subject to inconsistency and variability. To achieve the accuracy and consistency in recognizing handwritten characters, the present work discusses an efficient approach to segment the handwritten text into individual characters. In order to achieve this, the writing space is divided into three different zones and then the zones are subdivided tiny square shape grids, which are distributed evenly. After this, we analyze to find the presence of handwritten character in a selected grid by performing horizontal scanning method. Moreover, we propose an approach of segmenting the character set of a single line text by vertical scanning and curve pattern analysis on the touching zones of the selective grids. The efficacy of the approach has proven through rigorous testing on hand-written texts of both professional as well as non-professional users. The testing set consists of 106 text samples including both single line text phrases and short sentences. The proposed approach achieves around 100% accuracy for word level text segmentation on the handwritten texts of both professional and non-professional users. In addition, the average character level segmentation accuracy on texts written by professional and non-professional users are found to be 98.4% and 96.2% respectively. Thus, the average character level segmentation accuracy is improved by 97.3%.

关键词： Writing Connectors Pattern analysis Image segmentation Computational modeling Analytical models Shape

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Study on Subsynchronous Resonance Damping Control for Series-Compensated DFIG-Based Wind Farm

Study on Subsynchronous Resonance Damping Control for Series...

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2019 IEEE Sustainable Power and Energy Conference, iSPEC 2019

作者： Luo, Chao Guo, Qi Xiao, Xiangning Gole, A.M. Liao, Mengjun Electric Power Research Institute State Key Laboratory of HVDC China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China North China Electric Power University State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources Beijing China University of Manitoba Electrical and Computer Engineering Department Winnipeg Canada

ISBN: (纸本)9781728149301

Subsynchronous Resonance (SSR) is a potential threat for long distance power transmission from doubly fed induction generator (DFIG) based wind farms with fixed series compensation (FSC). In this paper, subsynchronous resonance damping control (SSRDC) strategy based on shunt voltage source converter is proposed. Taking account of different series compensation levels and wind speeds, several potential inputs to the SSRDC are investigated. SSRDC control parameters are determined via root locus techniques to ensure the system stability of subsynchronous modes. Considering implementation feasibility in practical project and stability of supersynchronous modes, an enhanced SSRDC is proposed. Impact of transmission line and DFIG parameters and the reactive power compensation to the mitigation effect is investigated. Time domain simulation using PSCAD/EMTDC are carried out to validate the effectiveness of the SSRDC. © 2019 IEEE.

关键词： Wind farm

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Modeling and Operation of the Power-to-Gas System for Renewables Integration: A Review

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CSEE Journal of Power and Energy Systems 2018年第2期4卷 168-178页

作者： Xuetao Xing Jin Lin Yonghua Song You Zhou Shujun Mu Qiang Hu State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical EngineeringTsinghua UniversityBeijing 100084China Department of Electrical and Computer Engineering University of MacaoMacaoChina Department of Electrical Engineering Tsinghua UniversityBeijing 100084China National Institute of Clean and Low Carbon Energy Beijing 102211China Tsinghua-Sichuan Energy Internet Research Institute Chengdu 610213China

Power-to-Gas(P2G)plays an important role in enhancing large-scale renewable energy integration in power *** an emerging inter-disciplinary subject,P2G technology requires knowledge in electrochemistry,electrical engineering,thermodynamic engineering,chemical engineering and system *** at P2G modeling and operational problems concerning the research field of power systems and the energy internet,this paper briefly reviews the main technologies and application potentials of the P2G system,and makes systematic summaries of major progresses related to P2G’s integration into the power grid in a bottom-top manner,including the modeling of high/room-temperature electrolysis cells,steady-state/dynamic optimization control of the P2G system,P2G’s integrated model and operational strategies at the grid *** the final part of this paper,suggestions are put forward on future research directions of P2G systems from the aspects of modeling and operational optimization.

关键词： Electrolysis cell multi-energy network modeling and operation power-to-gas

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Maximum Lifetime Optimized Collaboration of Data and Energy Routing in VANET

Maximum Lifetime Optimized Collaboration of Data and Energy ...

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2019虚拟现实与智能系统国际会议

作者： Ming Hu Hanlin Chen Jiejun Hu Hui Yan Ping Yu Platform of Jilin Province Science and Technology (S&T) Department "Jilin Province S&T Innovation Center for Physical Simulation and Security of Water resources and Electric Power Engineering" Changchun Institute of Technology College of Computer Science and Technology Changchun University of Technology School of Computer Sciences and Electrical Engineering University of Essex

The roadside units(RSUs) based on traditional grid has high carbon footprint and high deployment cost in vehicle dedicated *** ideal green alternative has become an important issue in Vehicular Ad-Hoc Networks(VANETs).In this paper,we propose a novel framework of energy harvesting and cooperation to maximize the life cycle in *** this VANET scenario,the RSU node can harvest energy from the nature and also receive down steam vehicle energy dispatch to maintain the energy needed for data transmission,may transfers a portion of obtained energies by RSU nodes to the neighboring RSU nodes through energy *** vehicle can access the RSU in two ways:1) direct delivery when the vehicle is within the transmission range of the RSU;2) multihop relay when the vehicle is not within the transmission range of the *** analysing the data rate,transmission power and energy transmission,we solve the problem of maximum network life cycle in the conservation law of energy and *** consider involving energy constraints and data transmission joint problem,we optimize each RUS nodes energy management over vehicular outgoing data links and its energy transfers to neighboring RSU *** this case,with no energy cooperation,we show that each RSU node should allocate more power to links with more noise and/or more data *** addition,when there is energy cooperation,our numerical results indicate that the energy is routed from nodes with higher energy to nodes with lower *** results show that energy and data routing cooperation in VANET strategy can effectively improve the network life cycle.

关键词： Road side units Energy harvesting data and energy routing cooperation life cycle

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First Search for Axion-Like Particles in a Storage Ring Using a Polarized Deuteron Beam

arXiv

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arXiv 2022年

作者： Karanth, S. Stephenson, E.J. Chang, S.P. Hejny, V. Pretz, J. Semertzidis, Y.K. Wirzba, A. Wrońska, A. Abusaif, F. Aksentev, A. Alberdi, B. Aggarwal, A. Andres, A. Barion, L. Bekman, I. Beyß, M. Böhme, C. Breitkreutz, B. von Byern, C. Canale, N. Ciullo, G. Dymov, S. Fröhlich, N.-O. Gebel, R. Grigoryev, K. Grzonka, D. Hetzel, J. Javakhishvili, O. Jeong, H. Kacharava, A. Kamerdzhiev, V. Keshelashvili, I. Kononov, A. Laihem, K. Lehrach, A. Lenisa, P. Lomidze, N. Lorentz, B. Magiera, A. McHedlishvili, D. Müller, F. Nass, A. Nikolaev, N.N. Park, S. Pesce, A. Poncza, V. Prasuhn, D. Rathmann, F. Siddique, S. Saleev, A. Shurkhno, N. Shergelashvili, D. Shmakova, V. Slim, J. Soltner, H. Stassen, R. Ströher, H. Tabidze, M. Tagliente, G. Valdau, Y. Vitz, M. Wagner, T. Wüstner, P. JEDI Collaboration Marian Smoluchowski Institute of Physics Jagiellonian University Cracow30348 Poland Indiana University Department of Physics BloomingtonIN47405 United States Department of Physics KAIST Daejon34141 Korea Republic of Center for Axion and Precision Physics Research IBS Daejon34051 Korea Republic of Institut für Kernphysik Forschungszentrum Jülich Jülich52425 Germany III. Physikalisches Institut B RWTH Aachen University Aachen52056 Germany Forschungszentrum Jülich and RWTH Aachen University Germany Institute for Advanced Simulation Forschungszentrum Jülich Jülich52425 Germany Institute for Nuclear Research Russian Academy of Sciences Moscow117312 Russia University of Ferrara Istituto Nazionale di Fisica Nucleare Ferrara44100 Italy GSI Helmholtzzentrum für Schwerionenforschung Darmstadt64291 Germany Department of Electrical and Computer Engineering Agricultural University of Georgia Tbilisi0159 Georgia Department of Physics Korea University Seoul02841 Korea Republic of High Energy Physics Institute Tbilisi State University Tbilisi0186 Georgia L.D. Landau Institute for Theoretical Physics Chernogolovka142432 Russia Moscow Institute of Physics and Technology School of Physics Moscow region Dolgoprudny141707 Russia Zentralinstitut für Engineering Elektronik und Analytik Forschungszentrum Jülich Jülich52425 Germany Istituto Nazionale di Fisica Nucleare sez. Bari Bari70125 Italy

Based on the notion that the local dark-matter field of axions or axion-like particles (ALPs) in our Galaxy induces oscillating couplings to the spins of nucleons and nuclei (via the electric dipole moment of the latter and/or the paramagnetic axion-wind effect), we establish the feasibility of a new method to search for ALPs in storage rings. Based on previous work that allows us to maintain the in-plane polarization of a stored deuteron beam for a few hundred seconds, we performed a first proof-of-principle experiment at the Cooler Synchrotron COSY to scan momenta near 970 MeV/c. This entailed a scan of the spin precession frequency. At resonance between the spin precession frequency of deuterons and the ALP-induced EDM oscillation frequency there will be an accumulation of the polarization component out of the ring plane. Since the axion frequency is unknown, the momentum of the beam and consequently the spin precession frequency were ramped to search for a vertical polarization change that would occur when the resonance is crossed. At COSY, four beam bunches with different polarization directions were used to make sure that no resonance was missed because of the unknown relative phase between the polarization precession and the axion/ALP field. A frequency window of 1.5–kHz width around the spin precession frequency of 121 kHz was scanned. We describe the experimental procedure and a test of the methodology with the help of a radiofrequency Wien filter located on the COSY ring. No ALP resonance was observed. As a consequence an upper limit of the oscillating EDM component of the deuteron as well as its axion coupling constants are provided. © 2022, CC BY.

关键词： Storage rings

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Oscillation Detection and Diagnosis in Process Industries by Pattern Recognition Technique

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IFAC-PapersOnLine 2019年第1期52卷 299-304页

作者： Jônathan W.V. Dambros Marcelo Farenzena Jorge O. Trierweiler Group of Intensification Modeling Simulation Control and Optimization of Processes (GIMSCOP) Chemical Engineering Department Federal University of Rio Grande do Sul (UFRGS) R. Eng. Luiz Englert s/n Campus Central Porto Alegre RS Brazil Department of Computer Science University of Kaiserslautern 67663 Kaiserslautern Deutschland

Oscillation in control loops is a frequent problem faced in process industries. It deviates the process variables from their desired condition, affecting negatively plant productivity. To guarantee profitability, oscillation must be detected, diagnosed, and, finally, eliminated. Dozens of automatic detection and diagnosis techniques have been proposed over the last years. However, the application to real industrial data reveals low efficiencies, which indicates that the techniques require improvement. This work presents a new method for oscillation detection and diagnosis. The technique classifies the loops based on the shape of the PV(OP) diagram by a pattern recognition approach, where the model is trained with simulated examples that cover a large range of processes and different conditions found in industrial data, such as noise and disturbance presence. The performance of the proposed technique is compared to well-established oscillation detection and diagnosis methods, returning better results.

关键词： Oscillation detection diagnosis process control fault detection diagnosis pattern recognition process monitoring

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CenterNet3D: An anchor free object detector for point cloud

arXiv

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arXiv 2020年

作者： Wang, Guojun Wu, Jian Tian, Bin Teng, Siyu Chen, Long Cao, Dongpu The State Key Laboratory of Automotive Simulation and Control Jilin University Changchun130022 China The State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of Sciences Beijing100190 China The School of Artificial Intelligence University of Chinese Academy of Sciences Beijing100190 China The Department of Computer Science Hong Kong Baptist University Hong Kong The School of Data and Computer Science Sun Yat-Sen University Guangdong Guangzhou510275 China The Department of Mechanical and Mechatronics Engineering University of Waterloo WaterlooONN2L 3G1 Canada

Accurate and fast 3D object detection from point clouds is a key task in autonomous driving. Existing one-stage 3D object detection methods can achieve real-time performance, however, they are dominated by anchor-based detectors which are inefficient and require additional post-processing. In this paper, we eliminate anchors and model an object as a single point-the center point of its bounding box. Based on the center point, we propose an anchor-free CenterNet3D network that performs 3D object detection without anchors. Our CenterNet3D uses keypoint estimation to find center points and directly regresses 3D bounding boxes. However, because inherent sparsity of point clouds, 3D object center points are likely to be in empty space which makes it difficult to estimate accurate boundaries. To solve this issue, we propose an extra corner attention module to enforce the CNN backbone to pay more attention to object boundaries. Besides, considering that one-stage detectors suffer from the discordance between the predicted bounding boxes and corresponding classification confidences, we develop an efficient keypoint-sensitive warping operation to align the confidences to the predicted bounding boxes. Our proposed CenterNet3D is non-maximum suppression free which makes it more efficient and simpler. We evaluate CenterNet3D on the widely used KITTI dataset and more challenging nuScenes dataset. Our method outperforms all state-of-the-art anchor-based one-stage methods and has comparable performance to two-stage methods as well. It has an inference speed of 20 FPS and achieves the best speed and accuracy trade-off. Our source code will be released at https://***/wangguojun2018/CenterNet3d. Copyright © 2020, The Authors. All rights reserved.

关键词： Autonomous vehicles

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simulation for Cyber Risk Management – Where are we, and Where do we Want to Go?

Simulation for Cyber Risk Management – Where are we, and Wh...

引用

simulation Winter Conference

作者： Sachin Shetty Indrajit Ray Nurcin Ceilk Michael Mesham Nathaniel Bastian Quanyan Zhu Virginia Modeling Analysis and Simulation Center Old Dominion University Suffolk VA USA Department of Computer Science Colorado State University Fort Collins CO USA Department of Industrial Engineering University of Miami Coral Gables FL USA Army Cyber Institute Unidted States Military Academy West Point NY USA Department of Electrical and Computer Engineering New York University New York NY USA

ISBN: (数字)9781728132839

ISBN: (纸本)9781728120522

There is a dearth of simulation environments that conduct a comprehensive cyber risk assessment and provide insights that are accessible for decision makers and operational folks. During the Winter simulation Conference 2019, a group of experts will discuss the challenges and opportunities for developing simulation platforms for cyber risk management. The panel will focus on issues with integrating technologies into simulation platforms, loss of fidelity due to lack of access to cyber datasets and complexity involved in representing cyber-physical systems. This paper is a collection of position papers of the participating experts supporting their viewpoints that will be captured in the panel discussion.

关键词： Hafnium

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Investigation of electron beam effects on L-shell Mo plasma produced by a compact LC generator using pattern recognition

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Matter and Radiation at Extremes 2019年第2期4卷 52-58页

作者： M.F.Yilmaz Y.Danisman M.Ozdemir B.Karlık J.Larour Basic Sciences Engineering DepartmentImam Abdulrahman Bin Faisal UniversityDammamSaudi Arabia Department of Mathematics and Computer Sciences Queensborough Community CollegeCUNYBaysideNew York 11364USA Neurosurgical Simulation Research and Training Centre Department of NeurosurgeryMontreal Neurological Institute and HospitalMcGill UniversityMontrealQuebec H3A 2B4Canada Laboratoire de Physique des Plasmas(LPP) Ecole PolytechniqueUPMCCNRSPalaiseauFrance

In this paper,the effects of an electron beam on X-pinch-produced spectra of L-shellMoplasma are investigated for the first time by principal component analysis(PCA);this analysis is compared with that of line ratio diagnostics.A spectral database for PCA extraction is arranged using a non-Local Thermodynamic Equilibrium(non-LTE)collisional radiative L-shell Mo *** vector spectra of L-shell Mo,including F,Ne,Na and Mg-like transitions are studied to investigate the polarization types of these ***1 vector spectra of F,Ne,Na and Mg-like transitions result in linear polarization of Stokes Q ***,PC2 vector spectra show linear polarization of Stokes U profiles of 2p^(5)3s of Ne-like transitions which are known as responsive to a magnetic field[Trabert,Beiersdorfer,and Crespo Lo´pez-Urrutia,*** ***.,Sect.B 408,107–109(2017)].A 3D representation of PCA coefficients demonstrates that addition of an electron beam to the non-LTE model generates quantized,collective clusters which are translations of each other that follow V-shaped cascade trajectories,except for the case f=*** extracted principal coefficients are used as a database for an Artificial Neural Network(ANN)to estimate the plasma electron temperature,density and beam fractions of the time-integrated,spatially resolved L-shellMoX-pinch plasma ***-based ANNs provide an advantage in reducing the network topology,with a more efficient backpropagation supervised learning *** modeled plasma electron temperature is about Te;660 eV and density n_(e)=1×10^(20) cm^(-3),in the presence of the fraction of the beams with f-0.1 and centered energy of 5 keV.

关键词： spectrum. beam transitions

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