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| 1 | Air pollution characteristics and their relationship with emissions and meteorology in the Yangtze River Delta region during 2014–2016显示文摘With rapid economic growth and urbanization, the Yangtze River Delta(YRD) region in China has experienced serious air pollution challenges. In this study, we analyzed the air pollution characteristics and their relationship with emissions and meteorology in the YRD region during 2014–2016. In recent years, the concentrations of all air pollutants, except O3,decreased. Spatially, the PM2.5, PM10, SO2, and CO concentrations were higher in the northern YRD region, and NO2 and O3 were higher in the central YRD region. Based on the number of non-attainment days(i.e., days with air quality index greater than 100), PM2.5 was the largest contributor to air pollution in the YRD region, followed by O3, PM10, and NO2.However, particulate matter pollution has declined gradually, while O3 pollution worsened.Meteorological conditions mainly influenced day-to-day variations in pollutant concentrations. PM2.5 concentration was inversely related to wind speed, while O3 concentration was positively correlated with temperature and negatively correlated with relative humidity.The air quality improvement in recent years was mainly attributed to emission reductions.During 2014–2016, PM2.5, PM10, SO2, NOx, CO, NH3, and volatile organic compound(VOC)emissions in the YRD region were reduced by 26.3%, 29.2%, 32.4%, 8.1%, 15.9%, 4.5%, and0.3%, respectively. Regional transport also contributed to the air pollution. During regional haze periods, pollutants from North China and East China aggravated the pollution in the YRD region. Our findings suggest that emission reduction and regional joint prevention and control helped to improve the air quality in the YRD region. | Tao Ma Fengkui Duan Kebin He Yu Qin Dan Tong Guannan Geng Xuyan Liu Hui Li Shuo Yang Siqi Ye Beiyao Xu Qiang Zhang Yongliang Ma | 2019 | Journal of Environmental Sciences2019，31，9： | 26 |
| 2 | Metal Flowing of Involute Spline Cold Roll-beating Forming显示文摘The present research on involute spline cold roll-beating forming is mainly about the principles and motion relations of cold roll-beating,the theory of roller design,and the stress and strain field analysis of cold roll-beating,etc.However,the research on law of metal flow in the forming process of involute spline cold roll-beating is rare.According to the principle of involute spline cold roll-beating,the contact model between the rollers and the spline shaft blank in the process of cold roll-beating forming is established,and the theoretical analysis of metal flow in the cold roll-beating deforming region is proceeded.A finite element model of the spline cold roll-beating process is established,the formation mechanism of the involute spline tooth profile in cold roll-beating forming process is studied,and the node flow tracks of the deformation area are analyzed.The experimental research on the metal flow of cold roll-beating spline is conducted,and the metallographic structure variation,grain characteristics and metal flow line of the different tooth profile area are analyzed.The experimental results show that the particle flow directions of the deformable bodies in cold roll-beating deformation area are determined by the minimum moving resistance.There are five types of metal flow rules of the deforming region in the process of cold roll-beating forming.The characteristics of involute spline cold roll-beating forming are given,and the forming mechanism of involute spline cold roll-beating is revealed.This paper researches the law of metal flow in the forming process of involute spline cold roll-beating,which provides theoretical supports for solving the tooth profile forming quality problem. | CUI Fengkui WANG Xiaoqiang ZHANG Fengshou XU Hongyu QUAN Jianhui LI Yan | 2013 | Chinese Journal of Mechanical Engineering2013，26，5： | 19 |
| 3 | Physicochemical analysis of individual atmospheric fine particles based on effective surface-enhanced Raman spectroscopy显示文摘Fine particles associated with haze pollution threaten the health of more than 400 million people in China. It is therefore of great importance to thoroughly investigate and understand their composition. To determine the physicochemical properties in atmospheric fine particles at the micrometer level, we described a sensitive and feasible surface-enhanced Raman scattering(SERS) method using Ag foil as a substrate. This novel method enhanced the Raman signal intensities up to 10,000 a.u. for ν(NO_3^-) in fine particles.The SERS effect of Ag foil was further studied experimentally and theoretically and found to have an enhancement factor of the order of ~10~4. Size-fractionated real particle samples with aerodynamic diameters of 0.4–2.5 μm were successfully collected on a heavy haze day,allowing ready observation of morphology and identification of chemical components, such as soot, nitrates, and sulfates. These results suggest that the Ag-foil-based SERS technique can be effectively used to determine the microscopic characteristics of individual fine particles, which will help to understand haze formation mechanisms and formulate governance policies. | Zhenli Sun Fengkui Duan Kebin He Jingjing Du Liu Yang Hui Li Tao Ma Shuo Yang | 2019 | Journal of Environmental Sciences2019，31，1： | 9 |
| 4 | Work Hardening Behavior of 1020 Steel During Cold-Beating Simulation显示文摘The present research of cold-beating formation mainly focused on roller design and manufacture, kinematics, constitutive relation, metal flow law, thermo-mechanical coupling, surface micro-topography and microstructure evolution. However, the research on surface quality and performance of workpieces in the process of cold-beating is rare. Cold-beating simulation experiment of 1020 steel is conducted at room temperature and strain rates ranging from 2000 to 4000 s^(-1) base on the law of plastic forming. According to the experimental data, the model of strain hardening of 1020 steel is established,Scanning Electron Microscopy(SEM) is conducted, the mechanism of the work hardening of 1020 steel is clarified by analyzing microstructure variation of 1020 steel. It is found that the strain rate hardening effect of 1020 steel is stronger than the softening effect induced by increasing temperatures, the process of simulation cold-beating cause the grain shape of 1020 steel significant change and microstructure elongate significantly to form a fibrous tissue parallel to the direction of deformation, the higher strain rate, the more obvious grain refinement and the more hardening effect. Additionally, the change law of the work hardening rate is investigated, the relationship between dislocation density and strain, the relationship between work hardening rate and dislocation density is obtained.Results show that the change trend of the work hardening rate of 1020 steel is divided into two stages, the work hardening rate decreases dramatically in the first stage and slowly decreases in the second stage, finally tending toward zero. Dislocation density increases with increasing strain and strain rate, work hardening rate decreases with increasing dislocation density. The research results provide the basis for solving the problem of improving the surface quality and performance of workpieces under cold-beating formation of 1020 steel. | Fengkui CUI Yuanfei LING Jinxue XUE Jia LIU Yuhui LIU Yan LI | 2017 | Chinese Journal of Mechanical Engineering2017，30，2： | 2 |
| 5 | 显示文摘 | Li Fengkui Zhu Wei Zhang Xian | 1999 | Journal of Applied Polymer Science1999，71，： | 2 |
| 6 | A review on water in low rank coals: The existence, interaction with coal structure and effects on coal utilization显示文摘 | Jianglong Yu Arash Tahmasebi Yanna Han Fengkui Yin Xianchun Li | 2013 | Fuel Processing Technology2013，，： | 2 |
| 7 | Thermosetting polymers from cationic copolymerization of tung oil: Synthesis and charac- terization显示文摘 | Li Fengkui Richard C Larock | 2000 | J Appl Polym Sci2000，78，5： | 1 |
| 8 | Studies on thermally stimulated shape memory effect of segmented polyurethanes显示文摘 | Li Fengkui Zhang Xian Hou Jianan | 1997 | Journal of Applied Polymer Science1997，64，： | 1 |
| 9 | Research on VSR Process for Large Machine Tool Body显示文摘 | Li Chunmei Cui Fengkui | 2011 | Applied Mechanics and Materials2011，455，： | 1 |
| 10 | Thermosetting polymers from cationic copolymerization of tung oil:Synthesis and characterization显示文摘 | Fengkui Li Richard C Larock | 2000 | Journal of Applied Polymer Science2000，78，5： | 1 |
| 11 | Thermophysical and mechanical properties of novel polymers prepared by the cationic copolymerization of fish oils, styrene and diviylbenzene 显示文摘 | Fengkui Li Annik Perrenoud Richard C Larock | 2001 | Polymer2001，42，10： | 1 |
| 12 | Synthesis, structure, and thermophysical and mechanical properties of new polymers prepared by the cationic copolymerization of corn oil, styrene, and divinylbenzene 显示文摘 | Fengkui Li Jovin Hasjim Richard C Larock | 2003 | Journal of Applied Polymer Science2003，90，7： | 1 |
| 13 | Shape Memory Effect of Polyethylene/Nylon6 Graft Copolymers显示文摘 | Li Fengkui Chen Yan Zhu Wei | 1998 | Polymer1998，39，26： | 1 |
| 14 | Polyurethane/conducting carbon black composites: structure, electric conductivity,strain recovery behavior, and their relationships显示文摘 | Li Fengkui Qi Lanying Yang Jiping | 2000 | Journal of Applied Polymer Science2000，75，： | 1 |
| 15 | Soybean oil-divinylbenzene thermosetting polymers: synthesis, structure, properties and their relationships 显示文摘 | Li Fengkui Hanson M V Larock R C | 2001 | Polymer2001，42，： | 1 |
| 16 | New soybean oil-styrene-divinylbenzene thermosetting copolymers Ⅰ: Synthesis and characterization显示文摘 | Li Fengkui Larock R C | 2001 | Journal of Applied Polymer Science2001，80，： | 1 |
| 17 | New soybean oil-styrene-divinylbenzene thermosetting copolymers Ⅱ : Dynamic mechanical properties显示文摘 | Li Fengkui Larock R C | 2000 | Journal of Polym of Science: Part B: Polymer Physics2000，38，： | 1 |
| 18 | New soybean oil-styrene-divinylbenzene thermosetting copolymers Ⅲ : Tensile stress-strain behavior 显示文摘 | Li Fengkui Larock R C | 2001 | Journal of Polymer Science: Part B: Polymer Physics2001，39，： | 1 |
| 19 | 显示文摘 | Li Fengkui Chen Yan Zhu Wei | 1998 | Polymer1998，39，26： | 1 |
| 20 | New soybean oil-styrene-divinylbenzene thermosetting eopolymers Ⅳ : Good damping properties显示文摘 | Li Fengkui Larock R C | 2002 | Polymers for Advanced Technologies2002，13，： | 1 |
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