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| 1 | Effect of microstructure on the mechanical and corrosion behaviors of a hot-extruded nickel aluminum bronze显示文摘In this paper,the influence of microstructure on the corrosion behavior of a hotextruded nickel aluminum bronze was studied.Three kinds of samples subjected to the hot-extrusion,annealing and quenching conditions were prepared and immersion tests in 3.5% NaCl solution were carried out.Microstructures and corrosion surface morphologies of the samples were observed by SEM.It was found that the retained β martensite and(α+κⅢ) lamella eutectoid in the as hot-extruded material were eliminated after annealing,and corrosion resistance of the alloy was improved.As to the as-quenched material,its corrosion rate was higher than that of the as hotextruded material since the volume fraction of β phase which was anodic to α phase increased after quenching.As regards the mechanical properties,the as-quenched sample possesses the highest hardness and tensile strength among the three kinds of samples,while the as-annealed sample possesses the highest elongation.That is to say,heat treatment plays different roles in the mechanical properties and corrosion resistance of the experimental alloy. | Datong ZHANG Ruiping CHEN Weiwen ZHANG Zongqiang LUO Yuanyuan LI | 2010 | Acta Metallurgica Sinica(English Letters)2010，23，2： | 5 |
| 2 | Photochemical properties and source of pollutants during continuous pollution episodes in Beijing, October, 2011显示文摘Beijing sufered from serious air pollution in October, 2011 with the occurrence of three continuous episodes. Here we analyze the pollution status of particulate matter, the relationship between the gaseous pollutants, physical and chemical properties of single particles, and the profile of watersoluble ions in PM2.5during the three episodes. Regional and photochemically aged air masses, which were characterized as having high values of O3and SO2, were hypothesized to have played a dominant role in the first episode. After mixing local air masses with freshly-emitted primary pollutants, the concentration of NOx continued to increase and the size of SO4 2, NO3 and NH4 +in the particle population continued to become smaller. The amount of elemental carbon-rich and organic carbonrich particles in the scaled single particles(0.2–2 μm) and water-soluble K+in PM2.5also increased in the episodes. All the available information suggests that the biomass or fuel burning sources in or around Beijing may have had a huge impact on the last two episodes. | Jian Gao Yuechong Zhang Meng Zhang Jingqiao Zhang Shulan Wang Jun Tao Han Wang Datong Luo Fahe Chai Chun Ren | 2014 | Journal of Environmental Sciences2014，26，1： | 4 |
| 3 | ABOUT THE BASIC INTEGRAL VARIANTS OF HOLONOMIC NONCONSERVATIVE DYNAMICAL SYSTEMS显示文摘In this paper,we prove that for holonomic nonconservative dynamical system the Poincareand Poincaré-Cartan integral invariants do not exist.Instead of them,we introduce the integral variants ofPoincaré Cartan’s type and of Poincaré’s type for holonomie noneonservative dynamical systems,and usethese variants to solve the problem of nonlinear vibration.We also prove that the integral invariants intro-duced in references[1]and[2]are merely the basic integral variants given by this paper. | Liu Duan Luo Yong (Beijing Institute of Technology)Xin Shenyu (P.O.Box 22,Datong,Shanxi) | 1991 | Acta Mechanica Sinica1991，7，2： | 3 |
| 4 | Integrated Control Strategy for CVT Powertrains with Consideration of Vehicle Drivability显示文摘During shift,power flow is not interrupted in powertrains equipped with continuously variable transmission(CVT).When hard acceleration is commanded,engine speed will flare and corresponding torque will be consumed,which leads to a drop in vehicle drive torque and also the vehicle acceleration.This is the reason why CVT vehicles have poor drivability during hard acceleration maneuver.Conventional method such as torque compensation doesn't always work due to the limited backup torque of engine.According to this,means to evaluate the drivability of CVT vehicles are studied,affect factors of drivability are analyzed in detail.Hard acceleration process of CVT vehicle is studied by theoretical analysis,based on which engine torque and ratio change rate of CVT are identified as two key control parameters that decide the drivability of CVT vehicles during hard acceleration maneuver.Therefore,a control strategy based on restricting the change rate of CVT ratio together with torque compensation is proposed,and two different algorithms to establish the limitation of ratio change rate are proposed.These two algorithms are simulated and compared with each other,results indicate that drop of vehicle acceleration is eliminated evidently by limit the change rate of CVT ratio,but small ratio change rate also results in a longer time to finish the accelerate process,an algorithm to decide a proper ratio change rate is needed in order to tune these different characteristics.In order to get better control effects,a new fuzzy logic based algorithm is proposed to decide a proper ratio change rate during kick down conditions,simulation and experiment results indicate that,the amount of vehicle acceleration decrease is reduced from about 1 m/s2 to almost 0,in the mean time the accelerate process only delayed for about 0.3 s.The proposed control strategy and algorithm can effectively tune the characteristics of CVT equipped vehicle during kick down conditions. | SUN Dongye LUO Yong QIN Datong | 2012 | Chinese Journal of Mechanical Engineering2012，25，3： | 3 |
| 5 | Downregulation of galectin-3 by EGF mediates the apoptosis of HepG2 cells显示文摘 | Zhenzhen Hu Xiuqin Jiang Ying Xu Nan Lu Weizhi Wang Jie Luo Han Zou Datong Zheng Xing Feng | 2012 | Molecular and Cellular Biochemistry2012，，1： | 1 |
| 6 | Achieving Superior Superplasticity in a Mg-6Al-Zn Plate via Multi-pass Submerged Friction Stir Processing显示文摘A large-scale Mg-6Al-Zn plate was prepared by multi-pass submerged friction stir processing(M-SFSP)and its superplastic deformation behavior was investigated.The maximum elongation of 467%,332%and 421%was attained for the samples oriented in the processing direction(PD),45°tilted toward the PD,and transverse direction(TD),respectively,when deformed at 623 K and a strain rate of 1×10^(−3) s^(−1).This was attributed to the homogeneous and fine-grained structure with mostly high-angle grain boundaries facilitating the prevalent deformation mechanism of grain boundary sliding,along with the weakened texture and dynamic recrystallization during hot deformation. | Xicai Luo Haolin Liu Limei Kang Jielin Lin Datong Zhang Dongyang Li Daolun Chen | 2022 | Acta Metallurgica Sinica(English Letters)2022，35，5： | 0 |
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