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SSrN 2022年

作者： Yao, Kai Huang, Xiao dong, Wenyi Wang, Fupeng Liu, Xueyong Yan, Yu Qu, Yanhui Fu, Yicheng Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control School of Environmental Science and Engineering Nanjing University of Information Science & Technology Nanjing210044 China Shenzhen518055 China Northeast China Municipal Engineering Design and Research Institute Co Ltd Jilin130021 China Urban and Rural Water Environment Technology R&D Center China Communications Construction Co Ltd Jilin130021 China China Urban and Rural Holdings Group Co Ltd Beijing100029 China State Key Laboratory of Simulation and Regulation of River Basin Water Cycle China Institute of Water Resources and Hydropower Research Beijing100038 China

To investigate the effect of alternating aerobic/anoxic (A/O) on pollutant removal performance and microbial community structure, three sequencing batch reactors (SBr) processes with different alternating A/O times were set up. The results showed that alternating A/O was beneficial for organic matter degradation and promote nitrogen (N) and phosphorus (P) removal performance, and the removal efficiencies of chemical oxygen demand (COd), ammonia nitrogen (NH4+-N), total nitrogen (TN), and total phosphorus (TP) increased 3.41%, 4.76%, 3.51%, and 6.27%, respectively. Besides, alternating A/O affected the dominant microbial community relative abundance (Proteobacteria and Bacteroidetes) and increased microbial richness and diversity. It also increased the relative abundance of aerobic denitrifying, heterotrophic nitrifying, and denitrifying phosphorus removal bacteria to change N and P removal patterns. Furthermore, the abundance of carbohydrate metabolism and amino acid metabolism were improved by alternating A/O to improve organic matter and TN removal. © 2022, The Authors. All rights reserved.

关键词： Chemical oxygen demand

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Economic optimisation of range-extended electric bus based on AMGA algorithm

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International Journal of Vehicle Systems Modelling and Testing 2020年第1期14卷 83-95页

作者： Zha, Yunfei Guo, ronghui Ma, Fangwu Song, Jinlong School of Mechanical and Automotive Engineering Fujian University of Technology Fuzhou350118 China Collaborative Innovation Center for R&D of Coach and Special Vehicle Xiamen University of Technology Xiamen361024 China State Key Laboratory of Automotive Simulation and Control Jilin University Changchun130022 China School of Mechanical and Electrical Engineering Tan Kah Kee College Xiamen University Xiamen363105 China

The power of a range-extended electric bus comes from its battery and range-extender. How to design the range-extender working point for the vehicle in the process of running is the key factor to achieve energy conservation and emission reduction. To solve this problem, a vehicle model was built by using AVL Cruise simulation software. Through Cruise and Isight co-simulation optimisation, a multi-objective optimisation model for per-100km fuel consumption and pollutant emission is established. Optimal variables include upper and lower limits of the power unit and working point of the range-extender. Adaptive mutation genetic algorithm (AMGA) was used as optimisation algorithm. results showed that fuel consumption and pollutant emissions were effectively reduced. The per 100-km fuel consumption decreased by 48.0%, carbon monoxide emission decreased by 49.6%, hydrocarbon emission decreased by 47.28%, and nitrogen oxide emission decreased by 51.1%. The economics of range-extended electric bus have been greatly improved. Copyright © 2020 Inderscience Enterprises Ltd.

关键词： Electric buses

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Author Correction: Stabilization of layered lithium-rich manganese oxide for anion exchange membrane fuel cells and water electrolysers

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Nature Catalysis 2024年 604页

作者： Xuepeng Zhong Lijun Sui Menghao Yang Jiwei Ma Toshinari Koketsu Malte Klingenhof Peter Strasser Sören Selve Kyle G. reeves Chuangxin Ge Lin Zhuang Wang Hay Kan Maxim Avdeev Miao Shu Nicolas Alonso-Vante Jin-Ming Chen Shu-Chih Haw Chih-Wen Pao Yu-Chung Chang Yunhui Huang Zhiwei Hu Shanghai Key Laboratory for R&D and Application of Metallic Functional Materials Institute of New Energy for Vehicles School of Materials Science and Engineering Tongji University Shanghai China Department of Chemistry Technical University Berlin Berlin Germany Battery Materials Development Section Business Creation Sector R&D Center Mitsui Mining and Smelting Company Limited Saitama Japan Center for Electron Microscopy (ZELMI) Technical University Berlin Berlin Germany Maison de la Simulation CEA CNRS Université Paris-Sud UVSQ Université Paris-Saclay Gif-sur-Yvette France The Institute for Advanced Studies Wuhan University Wuhan China Spallation Neutron Source Science Center Dongguan China Institute of High Energy Physics Chinese Academy of Sciences Beijing China Australian Nuclear Science and Technology Organisation Kirrawee DC New South Wales Australia School of Chemistry The University of Sydney Sydney Australia Institute of Advanced Science Facilities Shenzhen China IC2MP UMR-CNRS 7285 University of Poitiers Poitiers France National Synchrotron Radiation Research Center Hsinchu Taiwan State Key Laboratory of Material Processing and Die and Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan China Max Planck Institute for Chemical Physics of Solids Dresden Germany

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Coupled Pacific rim megadroughts contributed to the fall of the Mingdynasty’s capital in 1644 CE

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Science Bulletin 2024年第19期69卷 3106-3114页

作者： Feng Chen Tao Wang Xiaoen Zhao Jan Esper Fredrik Charpentier Ljungqvist Ulf Büntgen Hans W.Linderholm david Meko Hongna Xu Weipeng Yue Shijie Wang Yujiang Yuan Jingyun Zheng Wei Pan Fidel roig Martín Hadad Mao Hu Jiachang Wei Fahu Chen Yunnan Key Laboratory of International Rivers and Transboundary Eco-Security Institute of International Rivers and Eco-SecurityYunnan UniversityKunming 650504China Southwest United Graduate School Kunming 650504China Climate Change Research Center and Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Department of Geography Johannes Gutenberg UniversityMainz 55099Germany Global Change Research Institute(CzechGlobe) Czech Academy of SciencesBrno 60300Czech Republic Department of History Stockholm UniversityStockholm 10691Sweden Bolin Centre for Climate Research Stockholm UniversityStockholm 10691Sweden Swedish Collegium for Advanced Study LinneanumUppsala 75238Sweden Department of Geography University of CambridgeCambridge CB23ENUK Department of Geography Faculty of ScienceMasaryk UniversityBrno 61137Czech Republic Swiss Federal Research Institute(WSL) Birmensdorf 8903Switzerland Regional Climate Group Department of Earth SciencesUniversity of GothenburgGothenburg 40530Sweden Laboratory of Tree-Ring Research University of ArizonaTucson AZ 85721USA Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC FEMD) Nanjing University of Information Science and TechnologyNanjing 210044China Key Laboratory of Tree-ring Physical and Chemical Research Institute of Desert MeteorologyChina Meteorological AdministrationUrumqi 830002China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographical Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Key Laboratory of Digital Human Technology R&D and Application of Yunnan Provincial Department of Education Yunnan UniversityKunming 650504China Laboratorio de Dendrocronología e Historia Ambiental IANIGLA-CCT CONICET-Universidad Nacional de CuyoMendoza 5500Argentina Hémera Centro de Observación de La Tierra Escuela de Ingeniería ForestalFacultad de CienciasUniversidad MayorHuechuraba 85

Historical documents provide evidence for regional droughts preceding the political turmoil and fall of Beijing in 1644 CE,when more than 20 million people died in northern China during the late Ming famine ***,the role climate and environmental changes may have played in this pivotal event in Chinese history remains ***,we provide tree-ring evidence of persistent megadroughts from1576 to 1593 CE and from 1628 to 1644 CE in northern China,which coincided with exceptionally cold summers just before the fall of *** analysis reveals that these regional hydroclimatic extremes are part of a series of megadroughts along the Pacific rim,which not only impacted the ecology and society of monsoonal northern China,but likely also exacerbated external geopolitical and economic *** finding is corroborated by last millennium reanalysis data and numerical climate model simulations revealing internally driven Pacific sea surface temperature variations and the predominance of decadal scale La Ni?a-like conditions to be responsible for precipitation decreases over northern China,as well as extensive monsoon regions in the *** teleconnection patterns provide a mechanistic explanation for reoccurring drought spells during the late Ming dynasty and the environmental framework fostering the fall of Beijing in 1644 CE,and the subsequent demise of the Ming dynasty.

关键词： Paleoclimate Beijing Precipitation reconstruction Climate-society interactions Tree rings Ming dynasty

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Hybrid pervaporation and salting-out for effective acetone-butanol-ethanol separation from fermentation broth

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Bioresource Technology reports 2018年 2卷 45-52页

作者： Wen, Hao Gao, Heting Zhang, Tao Wu, Zhichao Gong, Peiwen Li, Zhuangzhuang Chen, Huidong Cai, di Qin, Peiyong Tan, Tianwei National Energy R&D Center for Biorefinery Beijing University of Chemical Technology Beijing100029 China College of Life Science and Technology Beijing University of Chemical Technology Beijing100029 China College of Chemical Engineering Beijing University of Chemical Technology Beijing100029 China Center for Process Simulation & Optimization Beijing University of Chemical Technology Beijing100029 China

In this study, hybrid pervaporation/salting-out process was coupled with fed-batch acetone-butanol-ethanol (ABE) fermentation for high-titer solvents production. At the first-stage separation, 18.8 g/L of ethanol, 125.9 g/L of acetone and 199.5 g/L of butanol were obtained in the permeate of pervaporation. Model solution with similar solvents content to the permeate condensate was used for the second-stage salting-out process based on K3PO4 and KH2PO4, respectively. The effect of salting-out factor on ABE concentrations and recoveries in the aqueous and organic phase was compared and optimized. results indicated that K3PO4 showed better salting-out performance. At the salting-out factor of 1.0, 99.01% of ABE was recovered. Correspondingly, 486.74 g/kg of butanol (805.52 g/kg of total ABE) could be tested in the organic phase. This novel hybrid process was a promising method for biobutanol production and separation. © 2018 Elsevier Ltd

关键词： Pervaporation

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How to verify the precision of density-functional-theory implementations via reproducible and universal workflows

arXiv

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arXiv 2023年

作者： Bosoni, Emanuele Beal, Louis Bercx, Marnik Blaha, Peter Blügel, Stefan Bröder, Jens Callsen, Martin Cottenier, Stefaan degomme, Augustin dikan, Vladimir Eimre, Kristjan Flage-Larsen, Espen Fornari, Marco Garcia, Alberto Genovese, Luigi Giantomassi, Matteo Huber, Sebastiaan P. Janssen, Henning Kastlunger, Georg Krack, Matthias Kresse, Georg Kühne, Thomas d. Lejaeghere, Kurt Madsen, Georg K.H. Marsman, Martijn Marzari, Nicola Michalicek, Gregor Mirhosseini, Hossein Müller, Tiziano M.A. Petretto, Guido Pickard, Chris J. Poncé, Samuel rignanese, Gian-Marco rubel, Oleg ruh, Thomas Sluydts, Michael Vanpoucke, danny E.P. Vijay, Sudarshan Wolloch, Michael Wortmann, daniel Yakutovich, Aliaksandr V. Yu, Jusong Zadoks, Austin Zhu, Bonan Pizzi, Giovanni Institut de Ciència de Materials de Barcelona ICMAB-CSIC Campus UAB Bellaterra08193 Spain Univ. Grenoble-Alpes CEA IRIG-MEM-L Sim Grenoble38000 France LausanneCH-1015 Switzerland Institute for Materials Chemistry Technical University of Vienna Getreidemarkt 9/165-TC ViennaA-1060 Austria Peter Grünberg Institut Institute for Advanced Simulation Forschungszentrum Jülich JARA JülichD-52425 Germany Forschungszentrum Jülich JülichD-52425 Germany Department of Electromechanical Systems and Metal Engineering Ghent University Belgium Ghent University Belgium Institute of Atomic and Molecular Sciences Academia Sinica Taipei10617 Taiwan Norwegian EuroHPC Competence Center Sigma2 AS Norway SINTEF Industry Materials Physics Oslo Norway Department of Physics Science of Advanced Materials Program Central Michigan University Mount PleasantMI48859 United States Université catholique de Louvain Chemin des Étoiles 8 Louvain-la-Neuve1348 Belgium LausanneCH-1015 Switzerland Kongens Lyngby2800 Denmark VilligenCH-5232 Switzerland University of Vienna Faculty of Physics Center for Computational Materials Science Kolingasse 14-16 ViennaA-1090 Austria VASP Software GmbH Sensengasse 8 ViennaA-1090 Austria Helmholtz-Zentrum Dresden-Rossendorf GörlitzD-02826 Germany Center for Sustainable Systems Design University of Paderborn PaderbornD-33098 Germany OCAS NV ArcelorMittal Global R&D Gent Pres. J. F. Kennedylaan 3 ZelzateB-9060 Belgium Dynamics of Condensed Matter Theoretical Chemistry University of Paderborn PaderbornD-33098 Germany HPE HPC EMEA Research Lab BaselCH-4051 Switzerland Department of Materials Science & Metallurgy University of Cambridge 27 Charles Babbage Road CambridgeCB3 0FS United Kingdom Advanced Institute for Materials Research Tohoku University 2-1-1 Katahira Aoba Sendai980-8577 Japan Department of Materials Science and Engineering McMaster University 1280 Main Street West HamiltonONL8S 4L8 Canada ePot

In the past decades many density-functional theory methods and codes adopting periodic boundary conditions have been developed and are now extensively used in condensed matter physics and materials science research. Only in 2016, however, their precision (i.e., to which extent properties computed with different codes agree among each other) was systematically assessed on elemental crystals: a first crucial step to evaluate the reliability of such computations. We discuss here general recommendations for verification studies aiming at further testing precision and transferability of density-functional-theory computational approaches and codes. We illustrate such recommendations using a greatly expanded protocol covering the whole periodic table from Z=1 to 96 and characterizing 10 prototypical cubic compounds for each element: 4 unaries and 6 oxides, spanning a wide range of coordination numbers and oxidation states. The primary outcome is a reference dataset of 960 equations of state cross-checked between two all-electron codes, then used to verify and improve nine pseudopotential-based approaches. Such effort is facilitated by deploying AiidA common workflows that perform automatic input parameter selection, provide identical input/output interfaces across codes, and ensure full reproducibility. Finally, we discuss the extent to which the current results for total energies can be reused for different goals (e.g., obtaining formation energies). © 2023, CC BY.

关键词： density functional theory

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Scale setting the Möbius domain wall fermion on gradient-flowed HISQ action using the omega baryon mass and the gradient-flow scales t0 and w0

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Physical review d 2021年第5期103卷 054511-054511页

作者： Nolan Miller Logan Carpenter Evan Berkowitz Chia Cheng Chang (張家丞) Ben Hörz dean Howarth Henry Monge-Camacho Enrico rinaldi david A. Brantley Christopher Körber Chris Bouchard M. A. Clark Arjun Singh Gambhir Christopher J. Monahan Amy Nicholson Pavlos Vranas André Walker-Loud Department of Physics and Astronomy University of North Carolina Chapel Hill North Carolina 27516-3255 USA Department of Physics Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA Department of Physics University of Maryland College Park Maryland 20742 USA Institut für Kernphysik and Institute for Advanced Simulation Forschungszentrum Jülich 54245 Jülich Germany Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS) RIKEN 2-1 Hirosawa Wako Saitama 351-0198 Japan Nuclear Science Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics University of California Berkeley California 94720 USA Physics Division Lawrence Livermore National Laboratory Livermore California 94550 USA Escuela de Físca Universidad de Costa Rica 11501 San José Costa Rica Arithmer Inc. R&D Headquarters Minato Tokyo 106-6040 Japan School of Physics and Astronomy University of Glasgow Glasgow G12 8QQ United Kingdom NVIDIA Corporation 2701 San Tomas Expressway Santa Clara California 95050 USA Design Physics Division Lawrence Livermore National Laboratory Livermore California 94550 USA Department of Physics The College of William & Mary Williamsburg Virginia 23187 USA Theory Center Thomas Jefferson National Accelerator Facility Newport News Virginia 23606 USA

We report on a subpercent scale determination using the omega baryon mass and gradient-flow methods. The calculations are performed on 22 ensembles of Nf=2+1+1 highly improved, rooted staggered sea-quark configurations generated by the MILC and CalLat Collaborations. The valence quark action used is Möbius domain wall fermions solved on these configurations after a gradient-flow smearing is applied with a flowtime of tgf=1 in lattice units. The ensembles span four lattice spacings in the range 0.06≲a≲0.15 fm, six pion masses in the range 130≲mπ≲400 MeV and multiple lattice volumes. On each ensemble, the gradient-flow scales t0/a2 and w0/a and the omega baryon mass amΩ are computed. The dimensionless product of these quantities is then extrapolated to the continuum and infinite volume limits and interpolated to the physical light, strange and charm quark mass point in the isospin limit, resulting in the determination of t0=0.1422(14) fm and w0=0.1709(11) fm with all sources of statistical and systematic uncertainty accounted for. The dominant uncertainty in both results is the stochastic uncertainty, though for t0 there are comparable continuum extrapolation uncertainties. For w0, there is a clear path for a few-per-mille uncertainty just through improved stochastic precision, as recently obtained by the Budapest-Marseille-Wuppertal Collaboration.

关键词： Chiral perturbation theory Lattice QCd Quantum chromodynamics

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development and case study of a new-generation model-VAT for analyzing the boundary conditions influence on atmospheric mercury simulation

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Frontiers of Environmental Science & Engineering 2018年第1期12卷 149-158页

作者： Wenwei Yang Yun Zhu Carey Jang Shicheng Long Che-Jen Lin Bin Yu Zachariah Adelman Shuxiao Wang Jia Xing Long Wang Jiabin Li Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control College of Environment and Energy South China University of Technology Guangzhou Higher Education Mega Center Guangzhou 510006 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China USEPA/Office of Air Quality Planning ＆ Standards RTP NC 27711 USA Guangzhou Urban Environmental Cloud Information Technology R＆D Co. Ltd Guangzhou 510006 China 5 Department of Civil Engineering Lamar University Beaumont TX 77710-0024 USA 6 Guangzhou Environmental Monitoring Center Station Guangzhou 510030 China 7 Institute for the Environment The University of North Carolina at Chapel Hill Chapel Hill NC 27517 USA

Atmospheric models are essential tools to study the behavior of air pollutants. To interpret the complicated atmospheric model simulations, a new-generation Model Visualization and Analysis Tool （Model-VAT） has been developed for scientists to analyze the model data and visualize the simulation results. The Model-VAT incorporates analytic functions of conventional tools and enhanced capabilities in flexibly accessing, analyzing, and comparing simulated results from multi-scale models with diflbrent map projections and grid resolutions. The performance of the Model-VAT is demonstrated by a case study of investigating the influence of boundary conditions （BCs） on the ambient Hg formation and transport simulated by the CMAQ model over the Pearl river delta （Prd） region. The alternative BC options are taken from （1） default time-independent profiles, （2） outputs from a CMAQ simulation of a larger nesting domain, and （3） concentration files from GEOS-Chem （re-gridded and re-projected using the Model-VAT）. The three BC inputs and simulated ambient concentrations and deposition were compared using the Model-VAT. The results show that the model simulations based on the static BCs （default profile） underestimates the Hg concentrations by --6.5%, dry depositions by -9.4%, and wet depositions by --43.2% compared to those of the model-derived （e. g. GEOS-Chem or nesting CMAQ） BCs. This study highlights the importance of model nesting approach and demonstrates that the innovative functions of Model-VAT enhances the efficiency of analyzing and comparing the model results from various atmospheric model simulations.

关键词： Model and data wsuahzatlonModel and data analysisCMAQBoundary conditionsMercury

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FK/Fπ from Möbius domain-wall fermions solved on gradient-flowed HISQ ensembles

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Physical review d 2020年第3期102卷 034507-034507页

作者： Nolan Miller Henry Monge-Camacho Chia Cheng Chang (張家丞) Ben Hörz Enrico rinaldi dean Howarth Evan Berkowitz david A. Brantley Arjun Singh Gambhir Christopher Körber Christopher J. Monahan M. A. Clark Bálint Joó Thorsten Kurth Amy Nicholson Kostas Orginos Pavlos Vranas André Walker-Loud Department of Physics and Astronomy University of North Carolina Chapel Hill North Carolina 27516-3255 USA Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS) RIKEN 2-1 Hirosawa Wako Saitama 351-0198 Japan Nuclear Science Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics University of California Berkeley California 94720 USA Arithmer Inc. R&D Headquarters Minato Tokyo 106-6040 Japan Physics Division Lawrence Livermore National Laboratory Livermore California 94550 USA Department of Physics University of Maryland College Park Maryland 20742 USA Institut für Kernphysik and Institute for Advanced Simulation Forschungszentrum Jülich 54245 Jülich Germany Design Physics Division Lawrence Livermore National Laboratory Livermore California 94550 USA Department of Physics The College of William & Mary Williamsburg Virginia 23187 USA Theory Center Thomas Jefferson National Accelerator Facility Newport News Virginia 23606 USA NVIDIA Corporation 2701 San Tomas Expressway Santa Clara California 95050 USA Scientific Computing Group Thomas Jefferson National Accelerator Facility Newport News Virginia 23606 USA

We report the results of a lattice quantum chromodynamics calculation of FK/Fπ using Möbius domain-wall fermions computed on gradient-flowed Nf=2+1+1 highly improved staggered quark (HISQ) ensembles. The calculation is performed with five values of the pion mass ranging from 130≲mπ≲400 MeV, four lattice spacings of a∼0.15, 0.12, 0.09 and 0.06 fm and multiple values of the lattice volume. The interpolation/extrapolation to the physical pion and kaon mass point, the continuum, and infinite volume limits are performed with a variety of different extrapolation functions utilizing both the relevant mixed-action effective field theory expressions as well as discretization-enhanced continuum chiral perturbation theory formulas. We find that the a∼0.06 fm ensemble is helpful, but not necessary to achieve a subpercent determination of FK/Fπ. We also include an estimate of the strong isospin breaking corrections and arrive at a final result of FK^+/Fπ^+=1.1942(45) with all sources of statistical and systematic uncertainty included. This is consistent with the Flavour Lattice Averaging Group average value, providing an important benchmark for our lattice action. Combining our result with experimental measurements of the pion and kaon leptonic decays leads to a determination of |Vus|/|Vud|=0.2311(10).

关键词： Lattice QCd Leptonic, semileptonic & radiative decays Particle decays Particle mixing & oscillations Quantum chromodynamics

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High-damping and conducting epoxy nanocomposite using both zinc oxide particles and carbon nanofibers

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Journal of Materiomics 2018年第3期4卷 187-193页

作者： Jae-Soon Jang Gyo Woo Lee Hyung-ick Kim Sung Yong Hong Lijie Ci Jae-do Nam Jonghwan Suhr Simulation Group Battery R&D CenterSAMSUNG SDI CO.LTDSamsung-RoYeongtong-GuSuwon-SiGyeonggi-DoSouth Korea Division of Mechanical Design Engineering Chonbuk National UniversityJeonju561-756South Korea Dongnam Regional Division Korea Institute of Industrial TechnologyJinju 52845South Korea Department of Polymer Science and Engineering Sungkyunkwan University2066SeoburoJangan-guGyeonggi-doSouth Korea School of Materials Science&Engineering Shandong UniversityChina School of Mechanical Engineering Sungkyunkwan University2066SeoburoJangan-guGyeonggi-doSouth Korea Department of Energy Science Sungkyunkwan University2066SeoburoJangan-guGyeonggi-doSouth Korea

In this study,high-damping and conducting epoxy nanocomposites were developed with carbon nanofibers as conducting materials,and zinc oxide particles as piezoelectric *** mechanical and electrical properties,electrical impedance,and loss factors were investigated by uniaxial tensile tests,voltage measurement,impedance measurement,and 3-point bending *** percolation thresholds were found:the percolation threshold of resistivity due to the carbon nanofibers forming conductive networks in the matrix;and the impedance threshold due to the zinc oxide particles acting like electric barriers.A poling treatment of the high-damping and conducting epoxy nanocomposite was considered,and we found that poling treatment helped to make the networks more conductive and to generate voltage from ZnO particles.A high-damping and conducting epoxy nanocomposite with 3 wt%CNF and 10 wt%ZnO exhibited higher loss factor than those of others tested.

关键词： damping Piezoelectric materials Impedance Poling treatment Loss factor

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