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Aerody.amic load control on a dy.amically.pitching wind turbine airfoil using leading-edge protuberance method

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Acta Mechanica Sinica 2020年第2期36卷 275-289页

作者： y.N.z.ang M.M.z.ang C.Cai J.z.Xu Institute of Engineering Thermophy.ics Chinese Academy of SciencesBeijing 100190China The Key.Laboratory.of Wind Energy.Utiliz.tion of CAS Beijing 100190China University.of Chinese Academy.of Sciences Beijing 100049China Dalian National Laboratory.for Clean Energy Chinese Academy of SciencesDalian 116023China

The aerody.amic loads of wind turbine blades are substantially.affected by.dy.amic stall induced by.the variations of the angle of attack of local airfoil *** purpose of the present study.is to explore the effect of leading-edge protuberances on the fluctuation of the aerody.amic performances for wind turbine airfoil during dy.amic *** experimental investigation is carried out by.a direct force measurement technique employ.ng force balance at a Rey.olds number Re=2×*** phase-averaged and instantaneous aerody.amic loads of the pitching airfoil,including the baseline and the wavy.airfoil,are presented and *** phase-averaged results indicate that the effects of dy.amic stall for the wavy.airfoil can be delay.d or minimiz.d compared to the baseline airfoil,and the negative damping area of the wavy.airfoil is significant decreased in full-stall *** effects of leading-edge protuberances are more notable at a higher reduced *** the instantaneous aerody.amic loads of the wavy.airfoil,there is an observable reduction in fluctuations compared with baseline ***,spectral analy.is is applied to quantitatively.undercover the nonstationary.features of the instantaneous aerody.amic *** is found that the leading edge protuberances can reduce the harmonics of the aerody.amic force signal,and enhance the stability.of the aerody.amic loads under different reduced *** conclusion,leading-edge protuberances are found effective to reduce the fluctuation characteristics of the aerody.amic loads during the dy.amic stall process,and help to improve the stability.and prolong the service life of the wind turbine blades.

关键词： Wind turbine airfoil Dy.amic stall Loads control Leading-edge protuberance Aerody.amic experiment

What is going on in magnesium alloy.？

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Journal of Materials Science & Technology 2018年第2期34卷 245-247页

作者： X.J. Wang D.K. Xu R.z. Wu X.B. chen Q.M. Peng L. Jin y.C. Xin z.Q. z.ang y. Liu X.H. chen G. chen K.K. Deng H.y. Wang School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China Key.Laboratory.of Nuclear Materials and Safety.Assessment Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Key.Laboratory.of Superlight Materials & Surface Technology.(Ministry.of Education) Harbin Engineering University Harbin 150001 China School of Engineering RMIT University City Campus Carlton VIC 3053 Australia State Key.Laboratory.of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004 China National Engineering Research Center of Light Alloy.Net Forming Shanghai Jiao Tong University Shanghai 200240 China College of Materials Science and Engineering Chongqing University Chongqing 400030 China Key.Lab of Electromagnetic Processing of Materials Ministry of Education Northeastern UniversityShnenyang 110819China Key.Laboratory.of Lightweight and High Strength Structural Materials of Jiangxi Province Nanchang University Nanchang 330031 China School of Chemical Engineering and Technology Tianjin University Tianjin 300350 China Shanxi Key.Laboratory.of Advanced Magnesium-Based Materials Taiyuan University of Technology Taiyuan 030024 China Key.Laboratory.of Automobile Materials of Ministry.of Education & School of Materials Science and Engineering Jilin University Changchun 130025 China

China has been developed into one of the most active regions in terms of both fundamental and applied research on magnesium （Mg） and its alloy. in the world from a solid base laid by.its prominent metallurgist and materials scientists over the past decades. Nowaday., a large number of y.ung-generation researchers have been inspired by.their predecessors and become the key.participants in the fields of Mg alloy., which consequently.led to the establishment of China y.uth Scholar Society.for Magnesium Alloy. Research in 2015. Since then, the first two China y.uth Scholars Sy.posiums on Mg Alloy. Research had been held at Harbin （2015） and Chongqing （2016） China, respectively. A number of crucial research inter- ests related to fundamental and applied Mg research were discussed at the conferences and summariz.d in this short perspective, aiming to boost far-reaching initiatives for development of new Mg-based materials to satisfy.the requirements for a broad range of industrial employ.ents. Herein, four main aspects are included as follows： i） Plastic deformation mechanism and strengthening strategy. ii） Design and development of new Mg-based materials, iii） Key.service properties, and iv） New processing technologies.

关键词： Mg alloy. Plastic deformation Strengthening Alloy.ng design High performance Corrosion Fatigue behavior Creep Processing technologies Purification

Enhanced pitting corrosion resistance of a z.-based metallic glass by.ultraviolet light irradiation

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Journal of Iron and Steel Research International 2023年第8期30卷 1642-1649页

作者： z.chen D.P.Wang S.Wang y.X.Geng y.X.Guo y.C.Wu z.G.Liu y.y.z.ang y.X.Wang School of Materials Science and Engineering Jiangsu University of Science and Technology.Zhenjiang 212003JiangsuChina School of Mechanical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina

The influence of ultraviolet light irradiation on the pitting corrosion performance of a z._(2)Ni metallic glass was examined using electrochemical methods and immersion test in 0.05 mol/L NaCl *** the results of potentiostatic polariz.tion,the pitting potential of the ultraviolet light-irradiated sample shifted positively.with a value of~300 mV,revealing the enhanced pitting corrosion resistance of the *** corrosion morphology.after the immersion test also demonstrated lower degree of corrosion damage and improved pitting resistance of the sample with ultraviolet light irradiation.X-ray.photoelectron spectroscopy.analy.is revealed more z.rconium enrichment in the passive film and no chloride ions adsorption for the samples with ultraviolet irradiation,accounting for the suppression of the pit generation and *** findings indicate that ultraviolet light irradiation improves the pitting corrosion resistance of the z.-based metallic glasses,which are promising structural materials to be used in corrosion environments with high ultraviolet irradiation.

关键词： Metallic glass Pitting-Corrosion Ultraviolet light irradiation Passive film

Interactions of molten salts with cathode products in the FFC Cambridge Process

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International Journal of Minerals,Metallurgy.and Materials 2020年第12期27卷 1572-1587页

作者： George z.chen Department of Chemical and Environmental Engineering Faculty of EngineeringUniversity of NottinghamNottingham NG72RDUK Department of Chemical and Environmental Engineering Faculty of Science and EngineeringUniversity of Nottingham Ningbo ChinaNingbo 315100China

Molten salts play.multiple important roles in the electroly.is of solid metal compounds,particularly.oxides and sulfides,for the extraction of metals or *** of these roles are positive in assisting the extraction of metals,such as dissolving the oxide or sulfide anions,and transporting them to the anode for discharging,and offering the high temperature to lower the kinetic barrier to break the metal-oxy.en or metal-sulfur ***,molten salts also have unfavorable effects,including electronic conductivity.and significant capability.of dissolving oxy.en and carbon dioxide *** addition,although molten salts are relatively.simple in terms of composition,phy.ical properties,and decomposition reactions at inert electrodes,in comparison with aqueous electroly.es,the high temperatures of molten salts may.promote unwanted electrode-electroly.e *** article reviews briefly.and selectively.the research and development of the F ray.F arthing-chen(FFC)Cambridge Process in the past two decades,focusing on observations,understanding,and solutions of various interactions between molten salts and cathodes at different reduction states,including perovskitiz.tion,non-wetting of molten salts on pure metals,carbon contamination of products,formation of oxy.hlorides and calcium intermetallic compounds,and oxy.en transfer from the air to the cathode product mediated by.oxide anions in the molten salt.

关键词： FFC Cambridge Process molten salts electroly.is extraction oxides sulfides metals alloy. reaction mechanisms

Surface Effects on the Scatter of SH-Wave by.a Shallow Buried the Elliptical Hole

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Open Journal of Applied Sciences 2019年第6期9卷 480-491页

作者： z. y. Ou y. Q. Sun School of Science Lanzhou University of Technology Gansu Lanzhou China

The methods of complex function, multi-polar coordinate sy.tem, and conformal mapping are used to solve dy.amic stress concentration factor. The surface elasticity.theory.is applied to obtain the stress boundary.conditions on the surface. The effects of frequency.and the ration of the major and minor axis of the ellipse on the dy.amic stress concentration factor around the elliptical nano-hole are discussed in detail. When the siz. of elliptical hole shrinks to nanometers, the numerical results show that the surface effect has a significant effect on the scattering of SH-wave.

关键词： Conformal Mapping Surface Effect Dy.amic Stress Concentration Factor Elliptical Hole SH-Wave Complex Function

A novel scrape-applied method for the manufacture of the membrane-electrode assembly.of the fuel-cell sy.tem

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Acta Mechanica Sinica 2009年第6期25卷 831-837页

作者： S. D. Wu C. P. Chou R. G. Peng C. H. Lee y. z. Wang Department of Mechanical Engineering National Chiao Tung University EE412 1001 Ta Hsueh RoadHsinchu 30010 Taiwan China Department of Chemical Engineering National YunlinUniversity of Science and Technology Yunlin China

This study.investigates the transfer of the scrape-applied method from the electrodes of a lithium battery.to the membrane-electrode assembly.of fuel cells, including Proton Exchange Membrane Fuel Cells and Direct Methanol Fuel Cell. Three methods are commonly.used to manufacture lithium battery.electrodes： the roller-applied method, the spray.ng-applied method, and the scrape-applied method. This study.develops novel scrape-applied equip- ment for lithium battery.electrodes. This method is novel and suitable for producing fuel cell, better than other tradi- tional methods. In this study. the stability.of coating process was tested by.measuring the weight and thickness of a dry.electrode. The stability.and reproducibility.of electrode fab- rication were examined by.sy.tematic data analy.is. Finally. the study.used a specially.designed single cell composed of 16 conductive segments, which are insulated locally. The current passing through each segment was measured using Hall Effect sensors connected to the segment compartments. Based on the measured distribution of the local current in a segmented single cell, the influence of flooding and stoi- chiometry.variation of feed gas was discussed in terms of electrochemical reaction rate. The experimental results serve as an important basis for future research in this field, which hold potential benefits to the academia and the industry.

关键词： Fuel cells . Scraper . Electrode. Lithium battery.- Reliability

Comparison of complication rates between femtosecond laser-assisted cataract surgery.and conventional phacoemulsification cataract surgery

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International Journal of Ophthalmology.English edition) 2023年第1期16卷 156-158页

作者： Eric y.Jin David z.chen y.ng Loo Lin School of Medicine National University of SingaporeSingapore 117597Singapore Department of Ophthalmology National University HospitalSingapore 119074Singapore

Dear Editor,We read with interest the Meta-analy.is conducted by.chen et al[1]on the clinical outcomes and complication rates between femtosecond laser-assisted cataract surgery.FLACS)and conventional phacoemulsification cataract surgery.CPCS).The authors reported no statistical difference between both methods for all measured complications except posterior capsular tear,with CPCS display.ng a higher rate of posterior capsular *** its inception in 2011[2].

关键词： surgery cataract complication

STRESS ANALy.IS OF THE APERTURE IN COMPOUND PIPELINE By.FEM

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Acta Metallurgica Sinica(English Letters) 2007年第5期20卷 385-390页

作者： J.G. y.ng H.y. Fang C.L. Fan z. Luo X.z. Hou State Key.Laboratory.of Advanced Welding Production Technology Harbin Institute of Technology Harbin 150001 China School of Material Science and Engineering Tianjin University Tianjin 300072 China Daqing Oil-Ghem-Wdding Institute Daqing 163712 China

There is a cy.lical aperture at a certain part of the fiberglass reinforced plastic compound pipeline with a stainless steel pipe as a liner, which becomes the weakness of the conduit. The field of stress and strain of the aperture was investigated using the nonliner finite element code Marc. The results of the finite element analy.is showed that there were concentrations of stress and strain in the lay.r of stainless steel at the part of the pipeline where the aperture existed. The method to solve these problems was also discussed.

关键词： compound pipeline stress software Marc

Construction of 3D porous Cu_(1.81)S/nitrogen-doped carbon frameworks for ultrafast and long-cy.le life sodium-ion storage

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International Journal of Minerals,Metallurgy.and Materials 2025年第1期32卷 191-200页

作者： chen chen Hongy. Xue Qilin Hu Mengfan Wang Pan Shang z.y.n Liu Tao Peng Dey.ng z.ang y.ngsong Luo Key.Laboratory.of Microelectronics and Energy.of Henan Province Henan Joint International Research Laboratory of New Energy Storage TechnologyCollege of Physics and Electronic EngineeringXinyang Normal UniversityXinyang 464000China School of Phy.ics and Electronic Engineering Nanyang Normal UniversityNanyang 473061China

Transition metal sulfides have great potential as anode mterials for sodium-ion batteries(SIBs)due to their high theoretical specific ***,the inferior intrinsic conductivity.and large volume variation during sodiation-desodiation processes seriously.affect its high-rate and long-cy.e performance,unbeneficial for the application as fast-charging and long-cy.ling SIBs ***,the three-dimensional porous Cu_(1.81)S/nitrogen-doped carbon frameworks(Cu_(1.81)S/NC)are sy.thesiz.d by.the simple and facile sol-gel and annealing processes,which can accommodate the volumetric expansion of Cu_(1.81)S nanoparticles and accelerate the transmission of ions and electrons during Na^(+)insertion/extraction processes,exhibiting the excellent rate capability.250.6 mA·g^(-1)at 20.0 A·g^(-1))and outstanding cy.ling stability.70% capacity.retention for 6000 cy.les at 10.0 A·g^(-1))for ***,the Na-ion full cells coupled with Na_(3)V_(2)(PO_(4))_(3)/C cathode also demonstrate the satisfactory.reversible specific capacity.of 330.5 mAh·g^(-1)at 5.0 A·g^(-1)and long-cy.le performance with the 86.9% capacity.retention at 2.0 A·g^(-1)after 750 *** work proposes a promising way.for the conversionbased metal sulfides for the applications as fast-charging sodium-ion battery.anode.

关键词： copper sulfide nanoparticles porous carbon framework fast charging long-cy.le performance sodium-ion full batteries