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9th Asia Conference on Power and Electrical engineering, ACPEE 2024

作者： Cheng, Hu Zhequan, Wu dejun, Yin rubing, Liu Nanjing University of Science and Technology School of Mechanical Engineering Nanjing China Jiaxipera Technology R&D Co. Ltd Motor R&D Department Hangzhou China

ISBN: (纸本)9798350309638

Aiming at the cogging torque of permanent magnet synchronous motor (PMSM), a method for expressing the cogging torque under the condition of rotor skewed pole of PMSM based on energy method and Fourier series analysis is proposed. The mathematical model between the cogging torque and the rotor skewed pole angle is established. Based on this, the optimal skew pole angle corresponding to the minimum cogging torque under continuous skewed pole and segmented skewed pole is derived. Based on this mathematical model, the output torque expression of PMSM under segmented skewed pole is further obtained. The simulation results prove that the cogging torque is weakened by 63.7 %, the cogging torque is weakened by 81.6 %, the waveform of the back-EMF is optimized and improved, and the high-order harmonic amplitude is effectively weakened, and the THd of back-EMF is reduced by 66.3 %. © 2024 IEEE.

关键词： Fourier series

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development of Intrinsic room-Temperature 2d Ferromagnetic Crystals for 2d Spintronics

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Chinese Physics Letters 2023年第5期40卷 71-77页

作者：靳雯张高节武浩杨丽张文峰常海欣 Center for Joining and Electronic Packaging State Key Laboratory of Material Processing and Die&Mold TechnologySchool of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Shenzhen R&D Center of Huazhong University of Science and Technology Shenzhen 518000China Institute for Quantum Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhan 430074China

Two-dimensional(2d)ferromagnetic crystals with fascinating optical and electrical properties are crucial for nanotechnology and have a wide variety of applications in ***,low Curie temperatures of most 2d ferromagnetic crystals seriously hinder their practical applications,thus searching for intrinsic roomtemperature 2d ferromagnetic crystals is of great importance for development of information ***,progresses have been achieved in the last few *** we review recent advances in the field of intrinsic room-temperature 2d ferromagnetic crystals and introduce their applications in spintronic devices based on van der Waals ***,the remaining challenge and future perspective on the development direction of intrinsic room-temperature 2d ferromagnetic crystals for 2d spintronics and van der Waals spintronics are briefly summarized.

关键词： ferromagnetic summarized searching

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Crystallographically vacancy‐induced MOF nanosheet as rational single‐atom support for accelerating CO_(2) electroreduction to CO

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Carbon Energy 2024年第8期6卷 49-62页

作者： Jin Hyuk Cho Joonhee Ma Chaehyeon Lee Jin Wook Lim Youngho Kim Ho Yeon Jang Jaehyun Kim Myung‐gi Seo Youngheon Choi Youn Jeong Jang Sang Hyun Ahn Ho Won Jang Seoin Back Jong‐Lam Lee Soo Young Kim Department of Materials Science and Engineering Korea UniversitySeoulRepublic of Korea Department of Chemical and Biomolecular Engineering Sogang UniversitySeoulRepublic of Korea Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH)PohangRepublic of Korea Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoulRepublic of Korea Lotte Chemical R&D Center DaejeonRepublic of Korea Department of Chemical Engineering Hanyang UniversitySeoulRepublic of Korea School of Chemical Engineering and Material Science Chung‐Ang UniversitySeoulRepublic of Korea

To attain a circular carbon economy and resolve CO_(2) electroreduction technology obstacles,single‐atom catalysts(SACs)have emerged as a logical option for electrocatalysis because of their extraordinary catalytic *** SACs,metal–organic frameworks(MOFs)have been recognized as promising support materials because of their exceptional ability to prevent metal *** study shows that atomically dispersed Ni single atoms on a precisely engineered MOF nanosheet display a high Faradaic efficiency of approximately 100% for CO formation in H‐cell and three‐compartment microfluidic flow‐cell reactors and an excellent turnover frequency of 23,699 h^(−1),validating their intrinsic catalytic *** results suggest that crystallographic variations affect the abundant vacancy sites on the MOF nanosheets,which are linked to the evaporation of Zn‐containing organic linkers during ***,using X‐ray absorption spectroscopy and density functional theory calculations,a comprehensive investigation of the unsaturated atomic coordination environments and the underlying mechanism involving CO^(*) preadsorbed sites as initial states was possible and provided valuable insights.

关键词： 2‐dimensional material carbon dioxide reduction metal-organic frameworks single‐atom catalysts vacancy sites

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deep Cryogenic Temperature CMOS Circuit and System design for Quantum Computing Applications

EAI Endorsed Transactions on Energy Web

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EAI Endorsed Transactions on Energy Web 2024年 11卷 1-8页

作者： rubia, Jency J. Shibi, Sherin C. rosi, A. Lincy, Babitha r. Nithila, Ezhil E. Vel Tech Rangarajan Sagunthala R&D Institute of Science and Technology Avadi India SRM Institute of Science and Technology Tamil Nadu Kattankulathur India Sri Eshwar College of Engineering Coimbatore India

Quantum computing is a fascinating and rapidly evolving field of technology that promises to revolutionize many areas of science, engineering, and society. The fundamental unit of quantum computing is the quantum bit that can exist in two or more states concurrently, as opposed to a classical bit that can only be either 0 or 1. Any subatomic element, including atoms, electrons, and photons, can be used to implement qubits. The chosen sub-atomic elements should have quantum mechanical properties. Most commonly, photons have been used to implement qubits. Qubits can be manipulated and read by applying external fields or pulses, such as lasers, magnets, or microwaves. Quantum computers are currently suffering from various complications such as size, operating temperature, coherence problems, entanglement, etc. The realization of quantum computing, a novel paradigm that uses quantum mechanical phenomena to do computations that are not possible with classical computers, is made possible, most crucially, by the need for a quantum processor and a quantum SOC. As a result, Cryo-CMOS technology can make it possible to integrate a Quantum system on a chip. Cryo-CMOS devices are electronic circuits that operate at cryogenic temperatures, usually below 77 K (−196 °C). Copyright © 2024 Jency rubia J et al., licensed to EAI. This is an open access article distributed under the terms of the CC BY-NC-SA 4.0, which permits copying, redistributing, remixing, transformation, and building upon the material in any medium so long as the original work is properly cited.

关键词： Integrated circuit design

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Halophobic Prussian blue analogue electrodes for saturated saline water electrolysis

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Nano research 2025年第3期18卷 90-97页

作者： Wei Liu Jiage Yu Boyu ding Tianshui Li Shihang Li Xinlong Guo Linlin Zhou Benqiang Tian Yixin Zhang Yizhe Li Mengze Ma Kairui Wang Huijun Xin daojin Zhou Yun Kuang Xiaoming Sun State Key Laboratory of Chemical Resource Engineering College of ChemistryBeijing University of Chemical TechnologyBeijing 100029China Ocean Hydrogen Energy R&D Center Research Institute of Tsinghua University in ShenzhenShenzhen 518057China

Continuous seawater electrolysis is efficient for green hydrogen production,but some key issues have been *** example,the accumulated to saturated NaCl in electrolyte is poison to cathode by covering its surface and available active *** we demonstrate Pt/NiFe Prussian blue analogue(Pt/NiFePBA)electrode can continuously catalyze hydrogen evolution effectively at−500 mA·cm^(−2)in a 6 M NaOH electrolyte containing saturated NaCl,without being impeded by the formation of NaCl crystals on the electrode surface,which is in distinct contrast to commercial *** results indicate that Fe(CN)_(6)^(4−)spontaneously released by Pt/NiFePBA blocks the traditionally preferred basal plane growth of NaCl along{100}facets,but favors its growth along{110}basal *** alteration leads to an increased crystallization difficulty of NaCl near the electrode,rendering it halophobic(anti-NaCl precipitation)*** investigation should shed light on general salt involving process besides the practical implementation of seawater electrolysis.

关键词： seawater electrolysis saturate saline water hydrogen evolution reaction halophobic electrode Prussian blue analogue

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Cyberspace Endogenous Safety and Security

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engineering 2022年第8期8卷 179-185页

作者： Jiangxing Wu National Digital Switching System Engineering&Technological R&D Center Zhengzhou 450002China

Uncertain security threats caused by vulnerabilities and backdoors are the most serious and difficult problem in *** paper analyzes the philosophical and technical causes of the existence of so-called"dark functions"such as system vulnerabilities and backdoors,and points out that endogenous security problems cannot be completely eliminated at the theoretical and engineering levels;rather,it is necessary to develop or utilize the endogenous security functions of the system architecture *** addition,this paper gives a definition for and lists the main technical characteristics of endogenous safety and security in cyberspace,introduces endogenous safety and security mechanisms and characteristics based on dynamic heterogeneous redundancy(dHr)architecture,and describes the theoretical implications of a coding channel based on dHr.

关键词： Cyberspace endogenous security problem Uncertain threat Cyberspace endogenous safety and security relative right axiom dynamic heterogeneous redundant architecture

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Atrous Convolution-Based residual deep CNN for Image dehazing with Spider Monkey-Particle Swarm Optimization

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Intelligent Automation & Soft Computing 2023年第8期37卷 1711-1728页

作者： CH.Mohan Sai Kumar r.S.Valarmathi Department of Electronics and Communication Engineering VelTech Rangarajan Dr.Sagunthala R&D Institute of Science and TechnologyChennai600062India

Image dehazing is a rapidly progressing research concept to enhance image contrast and resolution in computer vision *** to severe air dispersion,fog,and haze over the environment,hazy images pose specific challenges during information *** the advances in the learning theory,most of the learning-based techniques,in particular,deep neural networks are used for single-image *** existing approaches are extremely computationally complex,and the dehazed images are suffered from color distortion caused by the over-saturation and pseudo-shadow ***,the slow convergence rate during training and haze residual is the two demerits in the conventional image dehazing *** article proposes a new architecture“Atrous Convolution-based residual deep Convolutional Neural Network(CNN)”method with hybrid Spider Monkey-Particle Swarm Optimization for image *** large receptive field of atrous convolution extracts the global contextual *** swarm based hybrid optimization is designed for tuning the neural network parameters during *** experiments over the standard synthetic dataset images used in the proposed network recover clear output images free from distortion and halo *** is observed from the statistical analysis that Mean Square Error(MSE)decreases from 74.42 to 62.03 and Peak Signal to Noise ratio(PSNr)increases from 22.53 to *** proposed method with hybrid optimization algorithm demonstrates a superior convergence rate and is a more robust than the current state-of-the-art techniques.

关键词： Image dehazing computer vision convolutional neural network color distortion over-saturation pseudo-shadow phenomenon convergence rate

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design and implementation of novel variants of multi-level inverters for traction and heavy vehicle applications

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International Journal of Powertrains 2023年第1期12卷 54-80页

作者： Kumar, S. Sri Krishna dhal, P.K. Department of Electrical and Electronics Engineering Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology Chennai India

In the advent of increased transportation systems, the importance and growth of heavy vehicle movements and their applications play a significant role. The transportation sector involving heavy vehicles needs appropriate components for systematic movements. With the prominence of components utilised in heavy vehicle systems and power train mechanism, this paper develops novel variants of multi-level inverters for effective functioning of the vehicular system. Along with the classic multi-level inverter (MLI), new variants – modified multi-level inverter and reduced switch multi-level inverter are designed with complete operation based on their switching states and are implemented for a nine level output voltage module. The proposed inverter models for the heavy vehicle system is tested and validated based on the total harmonic distortion (THd). For each level and their switching states, THd is evaluated and the inverter performance is proved for its superiority for heavy vehicle system and their applicability in power train applications. Copyright © 2023 Inderscience Enterprises Ltd.

关键词： Power quality

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VALIdATION OF A HEAdSPACE GAS CHrOMATOGrAPHY METHOd FOr VOLATILE rESIdUAL SOLVENTS IdENTIFICATION IN rAdIOPHArMACEUTICALS

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UPB Scientific Bulletin, Series B: Chemistry and Materials science 2024年第4期2024卷 119-130页

作者： Tudoroiu-Cornoiu, Maria-roxana Chilug, Elena Livia Ion, Ion Niculae, dana Doctoral School of Applied Chemistry and Materials Science Faculty of Chemical Engineering and Biotechnologies National University of Science and Technology POLITEHNICA Bucharest Romania Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering Măgurele Romania

The following study presents the development and validation of a headspace gas chromatography (HS-GC) analytical method for determining five residual solvents, frequently encountered in radioactive drugs. Measurement of residual solvents is a critical step in the testing and release of pharmaceutical products. The method demonstrated high accuracy and precision, being specific and fast, under the regulations of the European Pharmacopoeia. © 2024, Politechnica University of Bucharest. All rights reserved.

关键词： Gas chromatography

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Surface micromorphology and nanostructures evolution in hybrid laser processes of slicing and polishing single crystal 4H-SiC

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Journal of Materials science & Technology 2024年第17期184卷 235-244页

作者： Yuhang Li Zhe Zhang Qi Song Haiyan Shi Yu Hou Song Yue ran Wang Shunshuo Cai Zichen Zhang Microelectronics Instruments and Equipment R&D Center Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China International Research Centre for Nano Handling and Manufacturing of China Changchun University of Science and TechnologyChangchun 130022China

Slicing and post-treatment of SiC crystals have been a significant challenge in the integrated circuit and microelectronics *** compete with wire-sawing and mechanical grinding technology,a promis-ing approach combining laser slicing and laser polishing technologies has been innovatively applied to increase utilization and decrease damage defects for single crystal *** material utiliza-tion has been achieved in the hybrid laser processes,where material loss is reduced by 75%compared to that of conventional machining *** any special process control or additional treat-ment,an internally modified layer formed by laser slicing can easily separate the 4H-SiC crystals using an external force of about∼3.6 *** modified layer has been characterized using a micro-raman method to determine residual *** sliced surface exhibits a combination of smooth and coarse appearances around the fluvial morphology,with an average surface roughness of over S_(a) 0.89μ*** amorphous phase surrounds the SiC substrate,with two dimensions of lattice spacing,d=0.261 nm and d=0.265 nm,confirmed by high-resolution transmission electron microscopy(HrTEM).The creation of laser-induced periodic surface nanostructures in the laser-polished surface results in a flatter surface with an average roughness of less than S_(a) 0.22μ*** to the extreme cooling rates and multiple thermal cy-cles,dissociation of Si-C bonding,and phase separation are identified on the laser-polished surface,which is much better than that of the machining *** anticipate that this approach will be applicable to other high-value crystals and will have promising viability in the aerospace and semiconductor industries.

关键词： Laser polishing Silicon carbide Internal modification Laser slicing Surface quality Microstructure

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