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Solar parabolic trough thermal energy output forecasting based on K-Nearest Neighbors approach

IOP Conference Series: Earth and Environmental Science 2019年第1期342卷

作者： Jafferi Jamaludin' Hiromitsu Ohmori Higher Institution's Center of Excellence (HICoE) University of Malaya Power Energy Dedicated Advanced Center (UMPEDAC) Level 4 Wisma R & D University of Malaya Jalan Pantai Baharu 59990 Kuala Lumpur Malaysia Department of System Design Engineering Faculty of Science and Technology Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan

Solar thermal output forecasting that is derived from the solar irradiance forecasting, is very much exposed to high forecasting error. This is because of the heavy dependence on the solar irradiance prediction accuracy that could be very low in certain situations owing to the high uncertainty in weather conditions. By considering this fact, this paper proposes to develop a solar thermal output forecasting model using measured solar irradiance data, instead of the predicted data. The proposed model applies K-Nearest Neighbors (K-NN) algorithm to generate 24-hour ahead forecasting data on solar thermal output from a solar parabolic trough system For the purpose of illustrating the forecasting model performance, Kuala Lumpur, Malaysia is used as a case study, with PolyTrough 1800 model is selected as the solar parabolic trough collector under investigation. Simulation has been carried out using Matlab software to verify the effectiveness of the proposed K-NN-based forecasting model. The results show that the model is able to produce acceptable results in certain conditions.

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Enhanced strength and ductility in a high-entropy alloy via ordered oxygen complexes

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Nature 2018年第7732期563卷 546-550页

作者： Zhifeng Lei Xiongjun Liu Yuan Wu Hui Wang Suihe Jiang Shudao Wang Xidong Hui Yidong Wu Baptiste Gault Paraskevas Kontis dierk raabe Lin Gu Qinghua Zhang Houwen Chen Hongtao Wang Jiabin Liu Ke An Qiaoshi Zeng Tai-Gang Nieh Zhaoping Lu Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing China. Department of Microstructure Physics and Alloy Design Max-Planck-Institut für Eisenforschung Düsseldorf Germany. Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing China. College of Materials Science and Engineering Chongqing University Chongqing China. Institute of Applied Mechanics Zhejiang University Hangzhou China. School of Materials Science and Engineering Zhejiang University Hangzhou China. Spallation Neutron Source Oak Ridge National Laboratory Oak Ridge TN USA. Center for High Pressure Science and Technology Advanced Research Pudong Shanghai China. Department of Materials Science and Engineering University of Tennessee Oak Ridge TN USA. Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing China. luzp@***.

Oxygen, one of the most abundant elements on Earth, often forms an undesired interstitial impurity or ceramic phase (such as an oxide particle) in metallic materials. Even when it adds strength, oxygen doping renders metals brittle. Here we show that oxygen can take the form of ordered oxygen complexes, a state in between oxide particles and frequently occurring random interstitials. Unlike traditional interstitial strengthening, such ordered interstitial complexes lead to unprecedented enhancement in both strength and ductility in compositionally complex solid solutions, the so-called high-entropy alloys (HEAs). The tensile strength is enhanced (by 48.5 ± 1.8 per cent) and ductility is substantially improved (by 95.2 ± 8.1 per cent) when doping a model TiZrHfNb HEA with 2.0 atomic per cent oxygen, thus breaking the long-standing strength-ductility trade-off. The oxygen complexes are ordered nanoscale regions within the HEA characterized by (O, Zr, Ti)-rich atomic complexes whose formation is promoted by the existence of chemical short-range ordering among some of the substitutional matrix elements in the HEAs. Carbon has been reported to improve strength and ductility simultaneously in face-centred cubic HEAs, by lowering the stacking fault energy and increasing the lattice friction stress. By contrast, the ordered interstitial complexes described here change the dislocation shear mode from planar slip to wavy slip, and promote double cross-slip and thus dislocation multiplication through the formation of Frank-read sources (a mechanism explaining the generation of multiple dislocations) during deformation. This ordered interstitial complex-mediated strain-hardening mechanism should be particularly useful in Ti-, Zr- and Hf-containing alloys, in which interstitial elements are highly undesirable owing to their embrittlement effects, and in alloys where tuning the stacking fault energy and exploiting athermal transformations do not lead to property enhancement. Thes

关键词： High-entropy Alloys (HEA) Interstitial Strengthening Wavy Slip Chemical Short-range Order double Cross Slip

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Linear-scaling electronic structure theory: Electronic temperature in the kernel polynomial method

arXiv

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arXiv 2017年

作者： McEniry, Eunan J. drautz, ralf Department of Computational Materials Design Max-Planck-Institut für Eisenforschung GmbH Düsseldorf Germany Interdiscplinary Centre for Advanced Materials Simulation Ruhr-Universität Bochum Germany

Linear-scaling electronic structure methods based on the calculation of moments of the underlying electronic Hamiltonian offer a computationally efficient and numerically robust scheme to drive large-scale atomistic simulations, in which the quantum-mechanical nature of the electrons is explicitly taken into account. We compare the kernel polynomial method to the Fermi operator expansion method and establish a formal connection between the two approaches. We show that the convolution of the kernel polynomial method may be understood as an effective electron temperature. The results of a number of possible kernels are formally examined, and then applied to a representative tight-binding model. Copyright © 2017, The Authors. All rights reserved.

关键词： Quantum theory

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Subaru narrow-band imaging search for Lyman continuum from galaxies at z > 3 in the GOOdS-N field ?

arXiv

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arXiv 2019年

作者： Iwata, Ikuru Inoue, Akio K. Micheva, Genoveva Matsuda, Yuichi Yamada, Toru Subaru Telescope National Astronomical Observatory of Japan 650 North A’ohoku Place HiloHI96720 United States 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Department of Astronomy and Physics Institute for Computational Astrophysics Saint Mary’s University 923 Robie Street HalifaxNSB3H 3C3 Canada Department of Environmental Science Faculty of Design Technology Osaka Sangyo University 3-1-1 Nakagaito Daito Osaka574-8530 Japan Department of Physics School of Advanced Science and Engineering Waseda University 3-4-1 Okubo Shinjuku Tokyo169-8555 Japan Waseda Research Institute for Science and Engineering 3-4-1 Okubo Shinjuku Tokyo169-8555 Japan Leibniz Institut für Astrophysik An der Sternwarte 16 PotsdamD-14482 Germany National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Institute of Space and Astronautical Science Japan Aerospace Exploration Agency 3-1-1 Yoshinodai Chuo-ku Sagamihara City Kanagawa252-5210 Japan

We report results of a search for galaxies at z > 3 with Lyman continuum (LyC) emission using a narrow-band filter NB359 with Subaru / Suprime-Cam in a ∼800 arcmin2 blank field around the GOOdS-N. We use 103 star-forming galaxies (SFGs) and 8 AGNs with spectroscopic redshifts in a range between 3.06 and 3.5, and 157 photometrically selected z = 3.1 Lyman α emitter (LAE) candidates as the targets. After removing galaxies spectroscopically confirmed to be contaminated by foreground sources, we found two SFGs and one AGN as candidate LyC emitting sources among the targets with spectroscopic redshifts. Among LAE candidates, five sources are detected in the NB359 image, and three among them may be contaminated by foreground sources. We compare the sample galaxies in the GOOdS-N with those in the SSA22, where a prominent protocluster at z = 3.1 is known and the LyC search using the same NB359 filter has been made. Frequency of galaxies with LyC leakage in the SSA22 field may be about two times higher than the galaxies in the GOOdS-N with the sample UV magnitude range, although the numbers of LyC detections in these fields are too small to make a statistically significant conclusion. By combining the sample galaxies in these fields, we place the 3σ upper limits of the observed LyC-to-UV flux density ratio and LyC escape fraction for galaxies at z = 3.1 with absolute UV magnitude MUV LyC/fUV)obs escabs Copyright © 2019, The Authors. All rights reserved.

关键词： Galaxies

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Wearable Electronics: Biocompatible Cost‐Effective Electrophysiological Monitoring with Oxidation‐Free Cu–Au Core–Shell Nanowire (Adv. Mater. Technol. 12/2020)

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advanced Materials Technologies 2020年第12期5卷 2070073-2070073页

作者： dongkwan Kim Junhyuk Bang Phillip Won Youngtaek Kim Jinwook Jung Jinwoo Lee Jinhyeong Kwon Habeom Lee Sukjoon Hong Noo Li Jeon Seungyong Han Seung Hwan Ko Department of Mechanical Engineering Seoul National University 1 Gwanak‐ro Gwanak‐gu Seoul 08826 Republic of Korea Manufacturing System R&D Group Korea Institute of Industrial Technology 89 Yangdaegiro‐gil Ipjang‐myon Seobuk‐gu Cheonan Chungcheongnam‐do 31056 Republic of Korea School of Mechanical Engineering Pusan National University 2 Busandaehak‐ro 63beon‐gil Geumjeong‐gu Busan 46241 Republic of Korea Department of Mechanical Engineering Hanyang University 55 Hanyangdaehak‐ro Sangnok‐gu Ansan Gyeonggi‐do 15588 Republic of Korea Institute of Advanced Machinery and Design (SNU‐IAMD) Seoul National University 1 Gwanak‐ro Gwanak‐gu Seoul 08826 Republic of Korea Department of Mechanical Engineering Ajou University 206 Worldcupro Yeongtong‐gu Suwon Gyeonggi‐do 16499 Republic of Korea Institute of Engineering Research Seoul National University 1 Gwanak‐ro Gwanak‐gu Seoul 08826 Republic of Korea

In article number 2000661, Seungyong Han, Seung Hwan Ko, and co‐workers address the oxidation and biocompatibility issues of Cu nanowires by developing a novel wet chemical synthesis method for the oxidation‐free Cu‐Au core‐shell nanowire based on the prepared Cu nanowire with alkylamine‐mediated synthesis and ligand exchange. Furthermore, high performance wearable electrophysiological monitoring sensors with the Cu‐Au core‐shell nanowire electrode are demonstrated with superior oxidation‐resistance and biocompatibility.

关键词： copper nanowires core–shell nanowires Cu–Au nanowires electrocardiography sensors electromyogram sensors ligand exchange wearable electronics

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The onset of star formation 250 million years after the Big Bang

arXiv

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arXiv 2018年

作者： Hashimoto, Takuya Laporte, Nicolas Mawatari, Ken Ellis, richard S. Inoue, Akio K. Zackrisson, Erik roberts-Borsani, Guido Zheng, Wei Tamura, Yoichi Bauer, Franz E. Fletcher, Thomas Harikane, Yuichi Hatsukade, Bunyo Hayatsu, Natsuki H. Matsuda, Yuichi Matsuo, Hiroshi Okamoto, Takashi Ouchi, Masami Pelló, roser rydberg, Claes-Erik Shimizu, Ikkoh Taniguchi, Yoshiaki Umehata, Hideki Yoshida, Naoki Department of Environmental Science and Technology Faculty of Design Technology Osaka Sangyo University 3-1-1 Nagaito Daito Osaka574-8530 Japan National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Department of Physics & Astronomy University College London Gower Street LondonWC1E 6BT United Kingdom IRAP Université de Toulouse CNRS UPS CNES 14 avenue Edouard Belin ToulouseF-31400 France Department of Physics and Astronomy Uppsala University Box 516 UppsalaSE-751 20 Sweden Department of Physics & Astronomy Johns Hopkins University 3400 N Charles St BaltimoreMD21218 United States Division of Particle and Astrophysical Science Graduate School of Science Nagoya University Furo-cho Chikusa-ku Nagoya464-8602 Japan Instituto de Astrofísica and Centro de Astroingeniería Facultad de Física Pontificia Universidad Católica de Chile Casilla 306 Santiago 22 Chile Nuncio Monseñor Sótero Sanz 100 Providencia Santiago Chile Space Science Institute 4750 Walnut Street Suite 205 BoulderCO80301 United States Institute for Cosmic Ray Research University of Tokyo 5-1-5 Kashiwanoha Kashiwa Chiba277-8582 Japan Department of Physics Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo113-0033 Japan Institute of Astronomy University of Tokyo 2-21-1 Osawa Mitaka Tokyo181-0015 Japan European Southern Observatory Karl-Schwarzschild-Str. 2 Garching bei München85748 Germany 2-21-1 Osawa Mitaka Tokyo181-8588 Japan Department of Cosmosciences Graduates School of Science Hokakido University N10 W8 Kitaku Sapporo060-0810 Japan Todai Institutes for Advanced Study University of Tokyo 5-1-5 Kashiwanoha Kashiwa Chiba277-8583 Japan Universität Heidelberg Zentrum für Astronomie Institut für Theoretische Astrophysik Albert-Ueberly-Str. 2 HeidelbergD-69120 Germany Theoretical Astrophysics Department of Earth & Space Science Osaka University 1-1 Machikaneyama Toyonaka Osaka560-0043 Japan Open

A fundamental quest of modern astronomy is to locate the earliest galaxies and study how they influenced the intergalactic medium a few hundred million years after the Big Bang1–3. The abundance of star-forming galaxies is known to decline4, 5 from redshifts of about 6 to 10, but a key question is the extent of star formation at even earlier times, corresponding to the period when the first galaxies might have emerged. Here we present spectroscopic observations of MACS1149-Jd16, a gravitationally lensed galaxy observed when the Universe was less than four per cent of its present age. We detect an emission line of doubly ionized oxygen at a redshift of 9.1096±0.0006, with an uncertainty of one standard deviation. This precisely determined redshift indicates that the red rest-frame optical colour arises from a dominant stellar component that formed about 250 million years after the Big Bang, corresponding to a redshift of about 15. Our results indicate the it may be possible to detect such early episodes of star formation in similar galaxies with future telescopes. Copyright © 2018, The Authors. All rights reserved.

关键词： Galaxies

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ErrATUM: “Versailles project on advanced materials and standards interlaboratory study on intensity calibration for x-ray photoelectron spectroscopy instruments using low-density polyethylene” [J. Vac. Sci. Technol. A 38, 063208 (2020)]

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Journal of Vacuum Science & Technology A 2021年第2期39卷

作者： Benjamen P. reed david J. H. Cant Steve J. Spencer Abraham Jorge Carmona-Carmona Adam Bushell Alberto Herrera-Gómez Akira Kurokawa Andreas Thissen Andrew G. Thomas Andrew J. Britton Andrzej Bernasik Anne Fuchs Arthur P. Baddorf Bernd Bock Bill Theilacker Bin Cheng david G. Castner david J. Morgan david Valley Elizabeth A. Willneff Emily F. Smith Emmanuel Nolot Fangyan Xie Gilad Zorn Graham C. Smith Hideyuki Yasufuku Jeffrey L. Fenton Jian Chen Jonathan d. P. Counsell Jörg radnik Karen J. Gaskell Kateryna Artyushkova Li Yang Lulu Zhang Makiho Eguchi Marc Walker Mariusz Hajdyła Mateusz M. Marzec Matthew r. Linford Naoyoshi Kubota Orlando Cortazar-Martínez Paul dietrich riki Satoh Sven L. M. Schroeder Tahereh G. Avval Takaharu Nagatomi Vincent Fernandez Wayne Lake Yasushi Azuma Yusuke Yoshikawa Claudia L. Compean-Gonzalez Giacomo Ceccone Alexander G. Shard 1National Physical Laboratory Hampton Road Teddington TW11 0LW United Kingdom 2CINVESTAV-Unidad Queretaro Queretaro 76230 Mexico 3Thermo Fisher Scientific (Surface Analysis) East Grinstead RH19 1XZ United Kingdom 4National Metrology Institute of Japan (NMIJ) National Institute of Advanced Industrial Science and Technology (AIST) 1-1-1 Higashi Tsukuba Ibaraki 305-8565 Japan 5SPECS Surface Nano Analysis GmbH Voltastraße 5 13355 Berlin Germany 6School of Materials Photon Science Institute and Sir Henry Royce Institute Alan Turing Building University of Manchester Oxford Road Manchester M13 9PL United Kingdom 7Versatile X-ray Spectroscopy Facility School of Chemical and Process Engineering University of Leeds Leeds LS2 9JT United Kingdom 8Academic Centre for Materials and Nanotechnology AGH University of Science and Technology 30-059 Kraków Poland 9Robert Bosch GmbH Robert-Bosch-Campus 71272 Renningen Germany 10Center for Nanophase Materials Sciences Oak Ridge National Laboratory 1 Bethel Valley Road Oak Ridge Tennessee 37830 11Tascon GmbH Mendelstr. 17 D-48149 Münster Germany 12Medtronic 710 Medtronic Parkway LT240 Fridley Minnesota 55432 13Analysis and Testing Center Beijing University of Chemical Technology Beijing 100029 People’s Republic of China 14National ESCA and Surface Analysis Center for Biomedical Problems Department of Bioengineering and Chemical Engineering University of Washington Seattle Washington 98195 15Cardiff Catalysis Institute School of Chemistry Cardiff University Main Building Cardiff CF10 3AT United Kingdom 16Physical Electronics Inc. East Chanhassen Minnesota 55317 17Versatile X-ray Spectroscopy Facility School of Design University of Leeds Leeds LS2 9JT United Kingdom 18Nanoscale and Microscale Research Centre University of Nottingham Nottingham NG7 2RD United Kingdom 19CEA-LETI 17 rue des Martyrs 38054 Grenoble France 20Instrumental Analysis & Research Center Sun Yat-sen University Guangzhou 510275 People’s Republic of C

The lead authors failed to name two collaborators as co-authors. The authors listed should include:

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26th Annual Computational Neuroscience Meeting (CNS*2017) of the Organization for Computational Neuroscience Antwerp, Belgium, July 15-20, 2017

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BMC NEUrOSCIENCE 2017年第SUPPL 1期18卷 59-59页

作者： [Anonymous] Indiana University Purdue University Indianapolis Indianapolis IN 46032 USA Stark Neurosciences Research Institute Indiana University School of Medicine Indianapolis IN 46032 USA Department of Mathematics East Carolina University Greenville NC 27858 USA Jülich Supercomputing Centre Forschungszentrum Jülich 52425 Jülich Germany Future Systems Swiss National Supercomputing Centre 8092 Zurich Switzerland User Engagement and Support Swiss National Supercomputing Centre 6900 Lugano Switzerland Institut de Neurosciences des Systèmes Aix Marseille Univ 13005 Marseille France Simulation Lab Neuroscience Forschungszentrum Jülich Jülich Germany Department of Experimental Psychology Ghent University 9000 Ghent Belgium Donders Center for Cognitive Neuroimaging Radboud University 6525HR Nijmegen The Netherlands Department of Electrical Computer and Energy Engineering University of Colorado Boulder CO 80309 USA Department of Neurosurgery Johns Hopkins School of Medicine Baltimore MD 21287 USA Department of Neurology Johns Hopkins School of Medicine Baltimore MD 21287 USA Department of Otolaryngology Johns Hopkins School of Medicine Baltimore MD 21287 USA INSERM U968 Paris France Sorbonne Universités UPMC University Paris 06 UMR_S 968 Institut de la Vision Paris France CNRS UMR_7210 Paris France Department of Computer Architecture and Technology University of Granada (CITIC) Granada Spain Sorbonne Universités UPMC Univ Paris 06 INSERM CNRS Institut de la Vision Paris France Department of Adaptive Machine Systems Osaka University Osaka Japan Department of Computer Science University of Cergy-Pontoise Cergy-Pontoise France Department of Physics and Astronomy College of Charleston Charleston SC 29424 USA School of Physics Faculty of Science University of Sydney Sydney NSW 2006 Australia Center of Excellence for Integrative Brain Function Australian Research Council Sydney Australia Max Planck Institute for Human Cognitive and Brain Sciences Saxony Lei

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On the Mechanical Stresses of Cu Through-Silicon Via (TSV) Samples Fabricated by SK Hynix vs. SEMATECH – Enabling robust and reliable 3-d Interconnect/Integrated circuit (IC) Technology

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Procedia Engineering 2016年 139卷 101-111页

作者： Tian Tian r. Morusupalli H. Shin H.-Y. Son K.-Y. Byun Y.-C. Joo r. Caramto L. Smith Y-L. Shen M. Kunz N. Tamura A.S. Budiman Maxim Integrated San Jose CA Component Quality and Technology (CQT) Cisco Systems San Jose CA 95134 Department Of Materials Science & Engineering Seoul National University (SNU) Republic of Korea PKG Development Group R&D Division Hynix Semiconductor Inc. Republic of Korea SEMATECH Albany NY 12203 Department Of Mechanical Engineering University of New Mexico (UNM) Albuquerque NM 87131 Advanced Light Source (ALS) Lawrence Berkeley National Laboratory (LBNL)Berkeley CA 94720 Singapore University of Technology and Design (SUTD) Singapore 487372

One of the key enablers for the successful integration of 3-d interconnects using the Through-Silicon Via (TSV) schemes is the control of the mechanical stresses in the Cu TSV itself as well as in the surrounding silicon substrate. The synchrotron-sourced X-ray microdiffraction technique has been recognized to allow some important advantages compared to other techniques in characterization of the mechanical stresses in a TSV sample. This approach have been used to study Cu TSV samples from SK Hynix, Inc. earlier as well as more recently from SEMATECH, and we have found interesting differences in the stress states of the Cu TSV. We proposed a possible explanation of the observed differences. This fundamental understanding could lead to improved stress control and hence reliability in the Cu TSV samples, as well as to reduce its impact to the silicon electron mobility and hence to device performance in general.

关键词： 3-d interconnects Cu TSV X-ray microdiffraction

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Performance improvement of spring operating mechanism for gas insulated circuite breaker by optimizing latch mechanism

Performance improvement of spring operating mechanism for ga...

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International Conference on Electric Power Equipment - Switching Technology

作者： Hyun-Woo Kim Sung-Ho Lee Jae-Yeol Kim Byung-Tae Bae Jin-Ho Kim Jin-Seok Jang Wan-Suk Yoo H.V Switchgear Advanced R&D Team Hyosung Corporation Changwon Korea Circuit Breaker Design Team Hyosung Corporation Changwon Korea School of Mechanical Engineering Pusan National University Pusan Korea

ISBN: (纸本)9781467374156

A performance of circuit breaker is dependent on the dynamic behavior of spring operating mechanism (SOM) in terms of mechanical system. The response speed of the circuit breaker is one of important part in the performance of circuit breaker and the response speed of the circuit breaker was determined by latch mechanism. The latch mechanism consists of solenoid actuator and several linkages with joints and springs. In this paper, the design variables were selected by using sensitivity analysis and design of experiment (dOE). The optimum design was executed and the response time was reduced. To validate the optimum value, the simulation results were compared the experimental results which were measured using a high speed camera. The simulation and experimental results were similar in reduced time.

关键词： circuit breaker spring operating mechanism latch mechanism design of experiment

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