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Global scaling of the heat transport in fusion plasmas

Physical Review Research 2020年第1期2卷 013027-013027页

作者： Sara Moradi Johan Anderson Michele Romanelli Hyun-Tae Kim JET contributors X. Litaudon S. Abduallev M. Abhangi P. Abreu M. Afzal K. M. Aggarwal T. Ahlgren J. H. Ahn L. Aho-Mantila N. Aiba M. Airila R. Albanese V. Aldred D. Alegre E. Alessi P. Aleynikov A. Alfier A. Alkseev M. Allinson B. Alper E. Alves G. Ambrosino R. Ambrosino L. Amicucci V. Amosov E. Andersson Sundén M. Angelone M. Anghel C. Angioni L. Appel C. Appelbee P. Arena M. Ariola H. Arnichand S. Arshad A. Ash N. Ashikawa V. Aslanyan O. Asunta F. Auriemma Y. Austin L. Avotina M. D. Axton C. Ayres M. Bacharis A. Baciero D. Baião S. Bailey A. Baker I. Balboa M. Balden N. Balshaw R. Bament J. W. Banks Y. F. Baranov M. A. Barnard D. Barnes M. Barnes R. Barnsley A. Baron Wiechec L. Barrera Orte M. Baruzzo V. Basiuk M. Bassan R. Bastow A. Batista P. Batistoni R. Baughan B. Bauvir L. Baylor B. Bazylev J. Beal P. S. Beaumont M. Beckers B. Beckett A. Becoulet N. Bekris M. Beldishevski K. Bell F. Belli M. Bellinger É. Belonohy N. Ben Ayed N. A. Benterman H. Bergsȧker J. Bernardo M. Bernert M. Berry L. Bertalot C. Besliu M. Beurskens B. Bieg J. Bielecki T. Biewer M. Bigi P. Bìlkovà F. Binda A. Bisoffi J. P. S. Bizarro C. Björkas J. Blackburn K. Blackman T. R. Blackman P. Blanchard P. Blatchford V. Bobkov A. Boboc G. Bodnàr O. Bogar I. Bolshakova T. Bolzonella N. Bonanomi F. Bonelli J. Boom J. Booth D. Borba D. Borodin I. Borodkina A. Botrugno C. Bottereau P. Boulting C. Bourdelle M. Bowden C. Bower C. Bowman T. Boyce C. Boyd H. J. Boyer J. M. A. Bradshaw V. Braic R. Bravanec B. Breizman S. Bremond P. D. Brennan S. Breton A. Brett S. Brezinsek M. D. J. Bright M. Brix W. Broeckx M. Brombin A. Brosawski D. P. D. Brown M. Brown E. Bruno J. Bucalossi J. Buch J. Buchanan M. A. Buckley R. Budny H. Bufferand M. Bulman N. Bulmer P. Bunting P. Buratti A. Burckhart A. Buscarino A. Busse N. K. Butler I. Bykov J. Byrne P. Cahyna G. Calabrò I. Calvo Y. Camenen P. Camp D. C. Campling J. Cane B. Cannas A. J. Capel P. J. Card A. Cardinali P. Carman M. Carr D. Carralero L. Carraro EUROfusion Consortium JET Culham Science Centre Abingdon OX14 3DB United Kingdom EUROfusion Programme Management Unit Culham Science Centre Culham OX14 3DB United Kingdom Forschungszentrum Jülich GmbH Institut für Energie- und Klimaforschung Plasmaphysik 52425 Jülich Germany Institute for Plasma Research Bhat Gandhinagar-382 428 Gujarat State India Instituto de Plasmas e Fusão Nuclear Instituto Superior Técnico Universidade de Lisboa Lisboa Portugal CCFE Culham Science Centre Abingdon Oxon OX14 3DB United Kingdom Department of Pure and Applied Physics Queens University Belfast BT7 1NN United Kingdom University of Helsinki P.O. Box 43 FI-00014 University of Helsinki Finland CEA IRFM F-13108 Saint Paul Lez Durance France VTT Technical Research Centre of Finland P.O. Box 1000 FIN-02044 VTT Finland National Institutes for Quantum and Radiological Science and Technology Naka Ibaraki 311-0193 Japan University of Napoli ‘Federico II’ Consorzio CREATE Via Claudio 21 80125 Napoli Italy Universidad Nacional de Educaciòn a Distancia Madrid Spain IFP-CNR via R. Cozzi 53 20125 Milano Italy ITER Organization Route de Vinon CS 90 046 13067 Saint Paul Lez Durance France Consorzio RFX corso Stati Uniti 4 35127 Padova Italy NRC Kurchatov Institute 1 Kurchatov Square Moscow 123182 Russian Federation University of Napoli Parthenope Consorzio CREATE Via Claudio 21 80125 Napoli Italy Unità Tecnica Fusione ENEA C. R. Frascati via E. Fermi 45 00044 Frascati (Roma) Italy Troitsk Insitute of Innovating and Thermonuclear Research (TRINITI) Troitsk 142190 Moscow Region Russian Federation Department of Physics and Astronomy Uppsala University SE-75120 Uppsala Sweden The National Institute for Cryogenics and Isotopic Technology Ramnicu Valcea Romania Max-Planck-Institut für Plasmaphysik D-85748 Garching Germany Dipartimento di Ingegneria Elettrica Elettronica e Informatica Universit degli Studi di Catania 95125 Catania Italy Fusion for Energy Joint Undertaking J

A global heat flux model based on a fractional derivative of plasma pressure is proposed for the heat transport in fusion plasmas. The degree of the fractional derivative of the heat flux, α, is defined through the power balance analysis of the steady state. The model was used to obtain the experimental values of α for a large database of the Joint European Torus (JET) carbon-wall as well as ITER like-wall plasmas. The fractional degrees of the electron heat flux are found to be α<2, for all the selected pulses in the database, suggesting a deviation from the diffusive paradigm. Moreover, the results show that as the volume integrated input power is increased, the fractional degree of the electron heat flux converges to α∼0.8, indicating a global scaling between the net heating and the pressure profile in the high-power JET plasmas. The model is expected to provide insight into the proper kinetic description for the fusion plasmas and improve the accuracy of the heat transport predictions.

关键词： Magnetic confinement fusion Plasma stability Plasma transport

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Numerical Analysis of Dispersion Compensation Schemes for Pseudo-linear Transmission System

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Journal of Optical Communications 2016年第1期37卷 81-85页

作者： Chen, Xu Zhao, Yajing Zhang, Lu Cai, Ju Zhou, Wei Liu, Lichuan Department of Electrical Engineering Northern Illinois University DeKalbIL60115 United States Institute of Nuclear Science and Technology Sichuan University Chengdu610064 China Key Laboratory of Radioactive Physics and Technology Ministry of Education of P.R.China Chengdu610064 China College of Communication Engineering Chengdu University of Information Technology Chengdu610225 China Education Department Key Laboratory of Radioactive Physics and Technology Sichuan University Chengdu610064 China

A pseudo-linear optical transmission system analytical model is built for the numerical analysis of dispersion compensation schemes. The system performance under the influence of intra-channel nonlinear effects and the initial pulse power is discussed for the data rates of 10, 40, 100 and 160 Gbit/s, respectively. We get the conclusion for the first time as we know the optimal dispersion compensation scheme for the optimal system performance is closely related to the system data rate and the proportion of the pre-dispersion compensation should be decreased while that of the post-dispersion compensation be increased with the increasing of system data rate. When the system data rate is higher than 160 Gbit/s, we can use the post-dispersion compensation scheme directly. © 2016 by De Gruyter.

关键词： Light transmission

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New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the European Spallation Source

arXiv

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arXiv 2020年

作者： Addazi, A. Anderson, K. Ansell, S. Babu, K.S. Barrow, J. Baxter, D.V. Bentley, P.M. Berezhiani, Z. Bevilacqua, R. Biondi, R. Bohm, C. Brooijmans, G. Broussard, L.J. Dev, B. Crawford, C. Dolgov, A.D. Dunne, K. Fierlinger, P. Fitzsimmons, M.R. Fomin, A. Frost, M. Gardiner, S. Gardner, S. Galindo-Uribarri, A. Geltenbort, P. Girmohanta, S. Golubeva, E. Greene, G.L. Greenshaw, T. Gudkov, V. Hall-Wilton, R. Heilbronn, L. Herrero-Garcia, J. Ichikawa, G. Ito, T.M. Iverson, E. Johansson, T. Jönsson, L. Jwa, Y.-J. Kamyshkov, Y. Kanaki, K. Kearns, E. Kerbikov, B. Kitaguchi, M. Kittelmann, T. Klinkby, E. Kobakhidze, A. Koerner, L.W. Kopeliovich, B. Kozela, A. Kudryavtsev, V. Kupsc, A. Lee, Y. Lindroos, M. Makkinje, J. Marquez, J.I. Meirose, B. Miller, T.M. Milstead, D. Mohapatra, R.N. Morishima, T. Muhrer, G. Mumm, H.P. Nagamoto, K. Nesti, F. Nesvizhevsky, V.V. Nilsson, T. Oskarsson, A. Paryev, E. Pattie, R.W. Penttilä, S. Pokotilovski, Y.N. Potashnikova, I. Redding, C. Richard, J.-M. Ries, D. Rinaldi, E. Rossi, N. Ruggles, A. Rybolt, B. Santoro, V. Sarkar, U. Saunders, A. Senjanovic, G. Serebrov, A.P. Shimizu, H.M. Shrock, R. Silverstein, S. Silvermyr, D. Snow, W.M. Takibayev, A. Tkachev, I. Townsend, L. Tureanu, A. Varriano, L. Vainshtein, A. de Vries, J. Woracek, R. Yamagata, Y. Young, A.R. Zanini, L. Zhang, Z. Zimmer, O. Amherst Center for Fundamental Interactions Department of Physics University of Massachusetts AmherstMA United States INFN Laboratori Nazionali del Gran Sasso Assergi AQ67010 Italy Fermi National Accelerator Laboratory BataviaIL60510-5011 United States Department of Physics Indiana University 727 E. Third St. BloomingtonIN47405 United States Indiana University Center for Exploration of Energy & Matter BloomingtonIN47408 United States Indiana University Quantum Science and Engineering Center BloomingtonIN47408 United States Department of Physics Boston University BostonMA02215 United States Center for Theoretical Physics College of Physics Science and Technology Sichuan University Chengdu610065 China Department of Physics University of Chicago ChicagoIL60637 United States Department of Physics University of Maryland College ParkMD20742-4111 United States Department of Physics and Astronomy University of South Carolina ColumbiaSC29208 United States Dipartimento di Scienze Fisiche e Chimiche Università di L’Aquila Coppito AQ67100 Italy National Institute of Standards and Technology GaithersburgMD20899 United States NRC "Kurchatov Institute" - PNPI Gatchina Russia Physics Department Technical University Munich Garching85748 Germany Institut Laue-Langevin Grenoble38042 France Department of Physics University of Helsinki P.O.Box 64 HelsinkiFIN-00014 Finland Institutionen för Fysik Chalmers Tekniska Högskola Sweden Department of Physics University of Houston HoustonTX77204-5008 United States Department of Physics and Astronomy East Tennessee State University Johnson CityTN37614 United States Department of Physics Kennesaw State University KennesawGA30144 United States Physics Department Indian Institute of Technology Kharagpur721302 India Department of Physics and Astronomy University of Tennessee KnoxvilleTN37996 United States Department of Nuclear Engineering University of Tennessee KnoxvilleTN37996 United States H

The violation of Baryon Number, B, is an essential ingredient for the preferential creation of matter over antimatter needed to account for the observed baryon asymmetry in the universe. However, such a process has yet to be experimentally observed. The HIBEAM/NNBAR program is a proposed two-stage experiment at the European Spallation Source (ESS) to search for baryon number violation. The program will include high-sensitivity searches for processes that violate baryon number by one or two units: free neutron-antineutron oscillation (n → n¯) via mixing, neutron-antineutron oscillation via regeneration from a sterile neutron state (n → [n', n¯'] → n¯), and neutron disappearance (n → n');the effective ∆B = 0 process of neutron regeneration (n → [n', n¯'] → n) is also possible. The program can be used to discover and characterise mixing in the neutron, antineutron, and sterile neutron sectors. The experiment addresses topical open questions such as the origins of baryogenesis, the nature of dark matter, and is sensitive to scales of new physics substantially in excess of those available at colliders. A goal of the program is to open a discovery window to neutron conversion probabilities (sensitivities) by up to three orders of magnitude compared with previous searches. The opportunity to make such a leap in sensitivity tests should not be squandered. The experiment pulls together a diverse international team of physicists from the particle (collider and low energy) and nuclear physics communities, while also including specialists in neutronics and magnetics. Copyright © 2020, The Authors. All rights reserved.

关键词： Neutrons

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The evolution behavior of defects in the nanofilms of W/Cu and W probed by Doppler broadening positron annihilation spectroscopy 17th

The evolution behavior of defects in the nanofilms of W/Cu a...

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17th International Conference onPositron Annihilation, ICPA-17

作者： Wang, Ling Deng, Ai-Hong Wang, Kang Wang, Yong Lu, Xiao-Bo Wang, Yuan Li, Ran Institute of Nuclear Science and Technology Sichuan University Chengdu610064 China College of Physical Science and Technology Sichuan University Chengdu610064 China School of Nuclear Science and Engineering East China Institute of Technology Nanchang330013 China

ISBN: (纸本)9783038356059

W/Cu multilayer nanofilms and pure W nanofilms were prepared in pure Ar and He/Ar mixing atmosphere by radio frequency magnetron sputtering method. The defect evolution of the samples was characterized by Doppler broadening positron annihilation spectroscopy (DB-PAS). The results show that plenty of defects can be produced by introducing helium (He) into W/Cu multilayer nanofilms. With the natural storage time increasing, the helium located in the near surface of W/Cu multilayer nanofilm would be released gradually and induce the coalescence of the helium related defects due to the diffusion of the helium and defects. In addition, the pure W nanofilms were irradiated by 30 keV helium ions and 40 keV hydrogen (H) ions in sequence at room temperature. From the DB-PAS analysis, it can be shown that a large number of vacancy-type defects are produced due to the He and/or H irradiation. H ions would be trapped by He related defects and produced He-H-V complexes. © 2016 Trans Tech Publications, Switzerland.

关键词： Doppler effect

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Scaling analysis and SE simulation of the tilted cylinder-interface capillary interaction

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IOP Conference Series: Materials Science and engineering 2018年第1期372卷

作者： S Q Gao X Y Zhang Y H Zhou National Key Laboratory of Science and Technology on Reactor System Design Technology Nuclear Power Institute of China Chengdu 610041 China Department of Mechanics and Engineering Sciences College of Civil Engineering and Mechanics Lanzhou University Lanzhou 730000 China

The capillary interaction induced by a tilted cylinder and interface is the basic configuration of many complex systems, such as micro-pillar arrays clustering, super-hydrophobicity of hairy surface, water-walking insects, and fiber aggregation. We systematically analyzed the scaling laws of tilt angle, contact angle, and cylinder radius on the contact line shape by SE simulation and experiment. The following in-depth analysis of the characteristic parameters (shift, stretch and distortion) of the deformed contact lines reveals the self-similar shape of contact line. Then a general capillary force scaling law is proposed to incredibly grasp all the simulated and experimental data by a quite straightforward ellipse approximation approach.

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Constraining Dark Matter Models with a Light Mediator at the PandaX-II Experiment

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Physical Review Letters 2018年第2期121卷 021304-021304页

作者： Xiangxiang Ren Li Zhao Abdusalam Abdukerim Xun Chen Yunhua Chen Xiangyi Cui Deqing Fang Changbo Fu Karl Giboni Franco Giuliani Linhui Gu Xuyuan Guo Ke Han Changda He Di Huang Shengming He Xingtao Huang Zhou Huang Xiangdong Ji Yonglin Ju Yao Li Heng Lin Huaxuan Liu Jianglai Liu Yugang Ma Yajun Mao Kaixiang Ni Jinhua Ning Andi Tan Hongwei Wang Meng Wang Qiuhong Wang Siguang Wang Xiuli Wang Shiyong Wu Jingkai Xia Mengjiao Xiao Pengwei Xie Binbin Yan Jijun Yang Yong Yang Hai-Bo Yu Jianfeng Yue Tao Zhang Jifang Zhou Ning Zhou Qibin Zheng Xiaopeng Zhou INPAC and School of Physics and Astronomy Shanghai Jiao Tong University Shanghai Laboratory for Particle Physics and Cosmology Shanghai 200240 China School of Physics and Technology Xinjiang University Ürümqi 830046 China Yalong River Hydropower Development Company Ltd. 288 Shuanglin Road Chengdu 610051 China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China School of Physics and Key Laboratory of Particle Physics and Particle Irradiation (MOE) Shandong University Jinan 250100 China Department of Physics University of Maryland College Park Maryland 20742 USA Tsung-Dao Lee Institute Shanghai 200240 China School of Mechanical Engineering Shanghai Jiao Tong University Shanghai 200240 China School of Physics Peking University Beijing 100871 China Center of High Energy Physics Peking University Beijing 100871 China Department of Physics and Astronomy University of California Riverside California 92521 USA School of Medical Instrument and Food Engineering University of Shanghai for Science and Technology Shanghai 200093 China

We search for nuclear recoil signals of dark matter models with a light mediator in PandaX-II, a direct detection experiment in the China Jinping underground laboratory. Using data collected in 2016 and 2017 runs, corresponding to a total exposure of 54 ton day, we set upper limits on the zero-momentum dark matter-nucleon cross section. These limits have a strong dependence on the mediator mass when it is comparable to or below the typical momentum transfer. We apply our results to constrain self-interacting dark matter models with a light mediator mixing with standard model particles, and set strong limits on the model parameter space for the dark matter mass ranging from 5 GeV to 10 TeV.

关键词： Extensions of gauge sector Particle dark matter Dark matter detectors

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Simulation study on characteristics of long-range interaction in randomly asymmetric exclusion process

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Chinese Physics B 2015年第4期24卷 106-110页

作者：赵仕波刘明哲杨兰英 State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology) College of Nuclear Technology and Automation Engineering Chengdu University of Technology

In this paper we investigate the dynamics of an asymmetric exclusion process on a one-dimensional lattice with long- range hopping and random update via Monte Carlo simulations theoretically. Particles in the model will firstly try to hop over successive unoccupied sites with a probability q, which is different from previous exclusion process models. The probability q may represent the random access of particles. Numerical simulations for stationary particle currents, density profiles, and phase diagrams are obtained. There are three possible stationary phases： the low density （LD） phase, high density （HD） phase, and maximal current （MC） in the system, respectively. Interestingly, bulk density in the LD phase tends to zero, while the MC phase is governed by α,β, and q. The HD phase is nearly the same as the normal TASEP, determined by exit rate β. Theoretical analysis is in good agreement with simulation results. The proposed model may provide a better understanding of random interaction dynamics in complex systems.

关键词： exclusion process Monte Carlo simulation random update long-range hopping

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A Node Division Location Detection Scheme for Chain-Type Wireless Sensor Networks

A Node Division Location Detection Scheme for Chain-Type Wir...

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成都理工大学核技术与自动化工程学院六十周年校庆大会

作者： CHEN Guang-zhu BAO Jiu-sheng ZHANG Lei College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu School of Mechanical and Electric Engineering China University of Mining and Technology Xuzhou of

As a special type of wireless sensor network, the chain-type wireless sensor networks can be used to monitor narrow and long regions, such as roads, underground mine tunnels, rivers, bridges, *** this study, a perpendicular bisector division (PB) method was firstly presented, in which the location may be divided into more location sub-areas by a perpendicular bisector of each of two location *** with the triangulation division (TD) method in APIT, the computable complexity of PB is lower and the number of division areas is ***, in order to locate targets under rare location nodes, a virtual location node-perpendicular bisector division (VPB) was presented by a virtual location node based on the geographic shape of the monitored *** location nodes increase the density of location nodes, which can improve the accuracy of the location in the location ***, two range-free location algorithms were proposed: the location algorithm based on PB (LAPB) and the location algorithm based on VPB (LAVPB).In the end the location errors performance of APIT, LAPB and LAVPB for locating miners in an underground mine tunnel were *** results show that LAPB and LAVPB have higher location accuracy and are more robust than *** is more suitable for locating targets in harsh environments.

关键词： wireless sensor networks chain-type location perpendicular bisector virtual location node

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Trapezoidal pulse shaping for pile-up pulse identification in X-ray spectrometry

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Chinese Physics C 2015年第6期39卷 110-115页

作者：周建斌刘易洪旭周靖马英杰王敏胡云川陈宝岳爱忠 College of Nuclear Technology and Automation Engineering Chengdu University of Technology China National Petroleum Corporation Logging

Energy resolution is affected by the intrinsic energy resolution of the detector, ballistic deficit, pileup pulses and noise. Pile-up pulses become the dominant factor that degrades energy resolution after the system is established, so pile-up rejection is often applied to obtain good energy resolution by discarding pulses that are expected to be contaminated by pile-up. However, pile-up rejection can reduce count rates and thus lower the measurement precision. In order to improve count rates and maintain energy resolution, a new method of pile-up pulse identification based on trapezoidal pulse shaping is presented. Combined with pulse width discrimination, this method is implemented by recording pulses that are not seriously piled up. Some experimental tests with a Cu-Pb alloy sample are carried out to verify the performance of this method in X-ray spectrometry. The results show that the method can significantly improve count rates without degrading energy resolution.

关键词： shaping discrimination seriously rejection maintain verify deficit contaminated correction filtered

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High temperature formability of graphene nanoplatelets-AZ31 composites fabricated by stir-casting method

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Journal of Magnesium and Alloys 2016年第4期4卷 270-277页

作者： Muhammad Rashad Fusheng Pan Yanglu Liu Xianhua Chen Han Lin Rongjian Pan Muhammad Asif Jia She College of Materials Science and Engineering Chongqing UniversityChongqing 400044China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China Chongqing Academy of Science and Technology Chongqing 401123China School of Materials Science and Engineering Dalian University of TechnologyDalian 116024China Nuclear Power Institute of China Chengdu 610213China

Outstanding mechanical properties of graphene nanoplatelets(GNPs)make them ideal reinforcement for mass production of *** this research,the composites were fabricated by stir-casting *** were added in 1.5 and 3.0 wt.%into Mg–3wt.%Al–1wt.%Zn(AZ31)magnesium *** cast ingots were preheated for one hour and extruded at 350℃ with extrusion ratio of 5.2:*** extruded AZ31-GNPs composites were micro-structurally characterized with X-ray diffraction,optical microscopy and scanning electron *** microhardness of synthesized materials was investigated both in parallel and perpendicular to extrusion *** temperature mechanical testing revealed that with increasing GNP’s content,tensile fracture strain was remarkably increased without significant compromise in tensile ***,as extruded AZ31-3GNPs composites were subjected to tensile testing at temperatures ranging from 75℃ to 300℃ with initial strain rate of 2×10^(−3)s^(−1) to evaluate high temperature formability of *** was found that like CNTs,GNPs also have the potential to sustain tensile strength at high temperatures.

关键词： Metal matrix composites Mechanical properties Stir-casting method Elevated temperatures

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