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Effect of Zener-Hollomon Parameter on Microstructure and Mechanical Properties of Copper Subjected to Friction Stir Welding

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Acta Metallurgica Sinica(English Letters) 2020年第2期33卷 319-326页

作者： nan Xu Ruo-nan feng Wen-feng Guo Qi-Ning Song Ye-feng Bao College of Mechanical and Electrical Engineering Hohai UniversityChangzhou 213022China

In this work,the influence of the Zener-Hollomon(Z)parameter on the microstructure and mechanical properties of copper subjected to friction stir welding(FSW)was *** N2 cooling was conducted to control the cooling rate after the *** obtained results demonstrate that the Z parameter was dependent on the tool rotation rate during the FSW,i.e.,a higher tool rotating rate resulted in a lower Z *** grain size in the stir zone decreased with the increase in the Z *** relationship between the yield strength and the Z parameter is established asσ0.2=σ0+*** relationship exhibited two different plots under the conditions of air cooling and liquid N2 *** at a similar Z parameter,a significant yield strength difference occurred because massive dislocations,which were caused by the prevention of the post-annealing effect,were maintained in the stir *** study suggests that the influence of the post-annealing effect should not be neglected when analyzing the relationship between the Z parameter,micro structure,and mechanical properties.

关键词： Copper Friction stir welding Microstructure Mechanical properties

A MALDI-MS sensing chip prepared by non-covalent assembly for quantitation of acid phosphatase

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Science China Chemistry 2021年第1期64卷 151-156页

作者： Qiulin Ma Yunlong Chen nan feng feng Yan Huangxian Ju State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Department Clinical Laboratory Affiliated Cancer Hospital of Nanjing Medical UniversityJiangsu Cancer HospitalJiangsu Institute of Cancer ResearchNanjing 210009China

A novel sensing chip was designed for MALDI-MS quantitation of acid phosphatase(ACP).The ACP sensing chip was constructed through non-covalent interaction of streptavidin and biotin for the assembly of biotinylated peptide substrate on biotinylated polyethylene-glycol(PEG)modified indium-tin oxide(ITO)*** the presence of ACP,the peptide substrate was dephosphorylated under acidic condition to generate a new mass *** quantitative assay of ACP was achieved with the mass signal ratio of product to the sum of product and left peptide *** optimal detection conditions,the ratio was linearly correlated with the concentration of ACP in the range of 0.05–12 g/L with a detection limit(LOD)of 0.04 g/*** designed ACP sensing chip has been used to analyze ACP in complex clinical samples,which exhibited high selectivity,good repeatability,and admirably anti-interference *** work further demonstrates the concept of MS sensing and the application of MALDI-MS in quantitative analysis,and provides a convenient method for the quantitation of proteases in clinical diagnosis.

关键词： acid phosphatase sensing chip MALDI-MS quantitation proteases mass signal

Characteristics of subsurface mesoscale eddies in the northwestern tropical Pacifi c Ocean from an eddy-resolving model

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Journal of Oceanology and Limnology 2020年第5期38卷 1421-1434页

作者： XU Anqi YU Fei nan feng REN Qiang Institute of Oceanology Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Ocean Circulation and Waves Chinese Academy of SciencesQingdao 266071China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Marine Dynamic Process and Climate Function Laboratory Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China

Subsurface eddies(SSEs)are common features of the ocean *** are particularly abundant in oceanic basins and the vicinity of major intermediate water outfl *** are responsible for subsurface transport of mass,heat,and *** of high-resolution general circulation model data has revealed the existence of subsurface anticyclonic eddies(SSAEs)and subsurface cyclonic eddies(SSCEs)in the northwestern tropical Pacifi c *** are abundant east of the Philippines(0°–22°N,120°E–140°E)and in latitude bands between 9°N–17°N east of 140°*** composite structure of SSEs was *** had a core at about 400-m water depth and their maximum meridional velocity exceeded 10 cm/*** exhibited two cores with diff erent salinity polarities in the surface and ***,spatial distributions of heat transport induced by SSEs in the northwestern tropical Pacifi c were presented for the fi rst time.A net equatorward heat fl ux toward a temperature up-gradient was *** analysis of eddy-mean fl ow interactions revealed that the circulation is baroclinically and barotropically unstable at diff erent depths and to diff ering *** energy conversions suggest that both barotropic and baroclinic instabilities are responsible for SSE generation east of the Philippines,whereas baroclinic instability caused by a horizontal density gradient and vertical eddy heat fl ux are important between 9°N and 17°N east of 140°*** movement of the north equatorial current and the north equatorial undercurrent can contribute to SSE generation in our study region.

关键词： the northwestern tropical Pacifi c Ocean subsurface eddies composite structures heat transport energy source

Evaluation of optimal UPFC allocation for improving transmission capacity

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Global Energy Interconnection 2020年第3期3卷 217-226页

作者： Xuhui Shen Hongmei Luo Wenman Gao Yuyao feng nan feng China Electric Power Research Institute Haidian DistrictBeijing 100192P.R.China State Grid Shanghai Municipal Electric Power Company Yangpu DistrictShanghai 200437P.R.China

A unified power flow controller(UPFC)combines the advantages of various flexible alternating current transmission system(FACTS)devices into a powerful *** a 500 kV power grid,this study evaluates the selection and use of a UPFC to improve transmission ***"UPFC unit capacity control proportionality coefficient"is introduced to quantify the control effect of the UPFC,and an optimal calculation method for the UPFC capacity is *** the proposal of a UPFC site selection process,the data of an existing power grid is used to conduct *** simulation results show that the UPFC has a strong ability to improve transmission capacity,and its use is greatly ***,by applying the proposed selection method,the control effect and economic benefits of the UPFC can be comprehensively considered during project site *** findings have a guiding significance for UPFC site selection in ultra-high voltage power grids.

关键词： Unified power flow controller UPFC unit capacity control proportionality coefficient UHV power grid Transmission capability Optimal capacity calculation UPFC site selection

Fault diagnosis and isolation of the componentand sensor for aircraft engine

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航空动力学报 2012年第6期27卷 1432-1440页

作者： QIU Xiao-jie HUANG Jin-quan LU feng LIU nan College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

Aircraft engine component and sensor fault detection and isolation approach was proposed,which included fault type detection module and component-sensor simultaneous fault isolation *** approach can not only distinguish among sensor fault,component fault and component-sensor simultaneous fault,but also isolate and locate sensor fault and the type of engine component fault when the engine component fault and the sensor faults occur *** double-threshold mechanism has been proposed,in which the fault diagnostic threshold changed with the sensor type and the engine condition,and it greatly improved the accuracy and robustness of sensor fault diagnosis *** results show that the approach proposed can diagnose and isolate the sensor and engine component fault with improved *** effectively improves the fault diagnosis ability of aircraft engine.

关键词： aircraft engine sensor fault engine component fault simultaneous fault diagnosis isolation double-threshold mechanism

A New Pyridine-substituted Azadithiolate 2Fe2S Complex Related to the Active Site of[FeFe]-hydrogenase

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Chinese Journal of Structural Chemistry 2016年第2期35卷 237-245页

作者： XU Fen-Fen feng Ya-nan DU Shao-Wu CHEN Yi-feng No.2 Middle School of nanchang Jiangxi 330006China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

A new 2Fe2 S complex[（2-C5H4N）N（μ-CH2S）2Fe2（CO）6]（1） related to the active site of[FeFe]-hydrogenase was obtained by treating（HS）2Fe2（CO）6 with（pyridin-2-ylazanediyl）*** occurred at the pyridine nitrogen atom when two equivalents of HBF4·OEt2acid were added to the toluene solution of 1,leading to the formation of[（2-C5H4NH）N（μ-CH2S）2Fe2（CO）6]·BF4·OEt2（1H~＋）,whose molecular structure was further established by singlecrystal X-ray *** 1 crystallizes in the monoclinic system,space group P21/n with α=7.728（3）,b = 11.825（4）,c = 17.888（6） A,β= 92.968（5）°,while complex 1H~＋ crystallizes in the triclinic system,space group P1 with a = 7.672（4）,b = 10.382（5）,c = 16.480（10） A,α=106.575（13）,β= 93.18（3）,γ=104.262（17）°.

关键词： bioinorganic chemistry [FeFe]-hydrogenase protonation proton reduction

Should competing sellers adopt the data analytics service to enable product improvement in online marketplace

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Journal of Management Science and Engineering 2024年第3期9卷 390-418页

作者： Danyu Liang Minqiang Li Haiyang feng nan feng College of Management and Economics Tianjin UniversityTianjin300072China Laboratory of CACMS Tianjin UniversityTianjin300072China

More and more marketplace platforms choose to use the data gathered from consumers(e.g.,customer search terms,demographics)to provide a data analytics service for third-party sellers,both encouraging innovations and improving the operations of the *** adopting the data analytics service,a seller can enhance its competitiveness by improving the quality of its products when there is more than one seller offering *** study develops a game-theoretic model to characterize a scenario with a marketplace platform and two competing sellers that sell substitutable products and decide whether to adopt the data analytics service provided by the ***,we find that a seller's decision of whether or not to purchase the service depends on the competitor's decision and the two sellers'absorptive capacities of ***,a seller can benefit from adopting the data analytics service only if the seller has a high absorptive capacity,which can help increase product *** only one seller adopts,the platform and competing sellers can benefit from the adoption if this seller's absorptive capacity is high and the other's is *** sellers'interests and social welfare can be aligned unless both sellers'absorptive capacities are low or high.

关键词： Marketplace platform Data analytics Seller's adoption strategy Absorptive capacity Duopoly market

Intraseasonal variability of the Kuroshio east of Taiwan, China, observed by subsurface mooring during 2016–2017

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Journal of Oceanology and Limnology 2020年第5期38卷 1408-1420页

作者： REN Qiang YU Fei nan feng WANG Jianfeng XU Anqi CAS Key Laboratory of Ocean Circulation and Wave Studies Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Pilot National Laboratory for Marine Science and Technology(Qingdao) Qingdao 266071China

The mean velocity structure and variability of the Kuroshio east of Taiwan,China,were investigated using mooring observations acquired at 23°N/122°E between January 2016 and May *** spectrum analysis reveals marked intraseasonal variability in 70–95 days in the meridional Kuroshio velocity in the upper 800 *** Coordinate Ocean Model assimilation data adequately reproduce variations of the *** propagating mesoscale eddies that originated from the Subtropical Countercurrent play an important role in intraseasonal variability in the Kuroshio ***(anticyclonic)eddies are often associated with negative(positive)sea surface height anomaly,resulting in positive(negative)potential vorticity in the subsurface layer of the eddy center,which decreases(increases)isopycnal slope and then weakens(strengthens)the *** anticyclonic(cyclonic)eddies are active,the Kuroshio axis moves off shore(inshore).Corresponding to the Kuroshio intraseasonal variability(ISV),the variation of the intermediate water salinity also had a signifi cant ISV induced by the mesoscale eddies.

关键词： intraseasonal variability Kuroshio mesoscale eddy intermediate water

First Record of Soft-shelled Turtle(Testudines, Trionychidae) from the Late Pleistocene of Heilongjiang, Northeast China

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Acta Geologica Sinica(English Edition) 2021年第4期95卷 1409-1410页

作者： WU Wenhao DONG nan LI Xiaobo ZHOU Changfu feng nan Robert R.REISZ Research Center of Palaeontology&Stratigraphy College of Earth ScienceJilin UniversityChangchun 130026China College of Earth Science Jilin UniversityChangchun 130061China Dinosaur Evolution Research Centre College of Earth ScienceJilin UniversityChangchun 130061China College of Earth Science and Engineering Shandong University of Science and TechnologyQingdaoShandong 266590China Heilongjiang Institute of Geological Sciences Harbin 150080China Department of Biology University of Toronto MississaugaMississaugaON L5L 1C6Canada

Objective Numerous vertebrate fossils, dominated by the Mammuthus–Coelodonta fauna, have been found from many Late Pleistocene fossil sites in Heilongjiang,northeast China(Jin and Kawamura, 1996). However,fossil turtles have not yet been reported. Recently, two soft-shelled turtle(trionychid) costal plates have been discovered together with other typical Mammuthus–Coelodonta fauna fossils.

关键词： Pleistocene Northeast northeast