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| 1 | Influence of Non-smooth Surface on Tribological Properties of Glass Fiber-epoxy Resin Composite Sliding against Stainless Steel under Natural Seawater Lubrication显示文摘With the development of bionics, the bionic non-smooth surfaces are introduced to the field of tribology. Although non-smooth surface has been studied widely, the studies of non-smooth surface under the natural seawater lubrication are still very fewer, especially experimental research. The influences of smooth and non-smooth surface on the frictional properties of the glass fiber-epoxy resin composite(GF/EPR) coupled with stainless steel 316 L are investigated under natural seawater lubrication in this paper. The tested non-smooth surfaces include the surfaces with semi-spherical pits, the conical pits, the cone-cylinder combined pits, the cylindrical pits and through holes. The friction and wear tests are performed using a ring-on-disc test rig under 60 N load and 1000 r/min rotational speed. The tests results show that GF/EPR with bionic non-smooth surface has quite lower friction coefficient and better wear resistance than GF/EPR with smooth surface without pits. The average friction coefficient of GF/EPR with semi-spherical pits is 0.088, which shows the largest reduction is approximately 63.18% of GF/EPR with smooth surface. In addition, the wear debris on the worn surfaces of GF/EPR are observed by a confocal scanning laser microscope. It is shown that the primary wear mechanism is the abrasive wear. The research results provide some design parameters for non-smooth surface, and the experiment results can serve as a beneficial supplement to non-smooth surface study. | WU Shaofeng GAO Dianrong LIANG Yingna CHEN Bo | 2015 | Chinese Journal of Mechanical Engineering2015，28，6： | 7 |
| 2 | Experimental Study on Influence of Dimples on Lubrication Performance of Glass Fiber-epoxy Resin Composite under Natural Seawater Lubrication显示文摘Bionic non-smooth surface is widely applied in metal and ceramics materials. In order to introduce this technology to high pressure seawater pump, the influence of bionic non-smooth surface on the engineering plastics used in pump should be investigated. The comparative tests are carried out with a ring-on-disc configuration under 800, 1000, 1200 and 1400 r/min in order to research the influence of the bionic non-smooth surface on glass fiber-epoxy resin composite(GF/EPR) under natural seawater lubrication. The disc surfaces are textured with five kinds of pits, which are semi-spherical, conical, cone-cylinder combined, cylindrical pits and through holes, respectively. A smooth surface is tested as reference. The results show that the lubrication performance of dimpled GF/EPR sample is much better than that of the smooth sample under all rotational speeds. The semi-spherical pits surface has more obvious friction reduction than the others, which shows that the least reduction is approximately 43.29% of smooth surface under 1200 r/min. However, the wear level is only marginally influenced by dimples. The surface morphology investigations disclose severe modifications caused by abrasive wear primarily. The results are helpful to vary friction properties of GF/EPR by non-smooth surface, or provide references to the design of non-smooth surfaces under certain condition. | WU Shaofeng GAO Dianrong LIANG Yingna CHEN Bo | 2017 | Chinese Journal of Mechanical Engineering2017，30，1： | 6 |
| 3 | Laser Remelting of Plasma Sprayed NiCrAlY and NiCrAlY-Al_2O_3 Coatings显示文摘Two types of plasma sprayed coatings (NiCrAlY and NiCrAlY-A12O3) were remelted by a 5 kW cw CO2 laser. With increasing laser power and decreasing traverse speed in the ranges of 200-700 W and 5-30 mm/s respectively, the melted track grew in width and depth. In the optimum range of laser parameters, a homogeneous remelted layer without voids, cavities, unmelted particles and microcracks was formed. On the surface of remelted layers, Al203 and YAIO3 were detected. As a result of isothermal oxidation tests, weight gains of laser remelted coatings were obviously lower than that only plasma sprayed, especially laser remelted NiCrAlY-Al2O3 coatings. The effects of laser remelting and incorporation of A12O3 second phase in N1CrAlY matrix on high temperature oxidation resistance were discussed. | Yingna WU, Gang ZHA NC, Bingchun ZHANG, Zhongchao FENG and Yong LIANG Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China Fangjun LIU Key Laboratory for High Energy Density Beam Processing Technology, Beijing Aeronautical Manu | 2001 | Journal of Materials Science & Technology2001，17，5： | 3 |
| 4 | Flying with the Dragon:Estimating Developing Countries’Gains from China’s Imports显示文摘As a large trading nation,China competes with importing countries'domestic and thirdcountry markets but also creates growth opportunities fo r exporters.Most studies on China trade shocks or 'China shocks'focuse on the impacts of import competition on developed economies.The present paper complements research on China shocks by exploring the other side of the trade exposure to China-China as the largest importer,rather than as an exporter.We analyze the effects of export expansion into China on the local labor markets of the exporting developing countries for the years 1992 to 2018.Using detailed export and employment data,we estimate employment pattern variations in manufacturing industries with exports from other developing countries as instruments for export exposure.We find that the increase in trade exposure to China in the world economy has caused extensive job gains in manufacturing industries in developing countries that were exporters.On average,our estimations show that this trade exposure created approximately 1.5 million additional jobs from 1992 to 2018,which made an important contribution to manufacturing industries in developing countries.Our empirical analysis also shows that trade had stabilizing effects on employment in the countries in our sample generally. | Xuefeng Qian Kalsoom Rafique Yingna Wu | 2020 | China & World Economy2020，28，5： | 2 |
| 5 | 有效使用小组活动的建议(英文)显示文摘为了突破以往传统语言教学中的哑巴英语的瓶颈,在当今的中国语言教学课堂中,交际能力受到越来越多的重视。交际能力的核心是相互交流,而小组活动则是进行相互交流的一种有效方式。这也是越来越多的教师在他们的语言课堂中开展小组活动的原因。在本文中作者将就教师和学生在小组活动中所碰到的问题进行讨论,并提出一些解决和避免这些问题的建议。 | Wu Yingna Zhongnan University of Economics and Law | 2002 | Chinese Journal of Applied Linguistics2002，25，1： | 2 |
| 6 | Laser remelting of plasma sprayed thermal barrier coatings 显示文摘 | Gang Zhang Yong Liang Yingna Wu | 2001 | Journal of Material Science & Technology2001，17，1： | 1 |
| 7 | Using Group Work Effectively:Suggestions on Using Group work in ELT Classroom显示文摘 | Yingna Wu | | 0，，01： | 1 |
| 8 | Subject Choosing in China's Transnational Investment显示文摘 | Weiliang Song Yingna Wu | 2004 | China-USA Business Review2004，3，10： | 0 |
| 9 | Surface Modification of Ceramic Materials Using Excimer Laser显示文摘Changes of surface morphology following XeCl excimer laser irradiation were investigated for three engineering ceramic materials (Al2O3, Al2O3-SiC nanocomposite and Si3N4). Al2O3 and Al2O3-SiC nanocomposite samples exhibit a smooth rapid melt layer on the surface, and the formation of the metastable γ-Al2O3 was observed. A silicon-rich layer on the surface was formed after laser irradiation of Si3N4. The toughness K1c of the materials was measured by the indentation fracture method. After laser irradiation, the toughness of Al2O3, Al2O3-SiC nanocomposite and Si3N4 was improved to various degrees:Al2O3-SiC nanocomposite, 60% (max), Al2O3, 40% (max), Si3N4, 12% (max). | Yingna WU, Zhongchao FENG and Jing LIANG (Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China) | 2000 | Journal of Materials Science & Technology2000，16，4： | 0 |
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