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We usually use the active control method to restrain its vibration .Piezoelectric materials with the advantages of wide working frequency, fast response, stable performance and strong electro-mechanical coupling effect, are widely used in flexible structure vibration control [1].
Closed-loop control equation of Piezoelectric laminated structures To achieve the active vibration control of flexible structure, we usually paste piezoelectric materials on the surface of the body structure as sensor and actuator.
Acknowledgements Supported by the National Natural Science Foundation of China (51109034).
(In Chinese) [3] Feng Qian: Journal of Vibration and Shock.2013,22（11）:161-166.
Dhuri, P.Seshu: Journal of Sound and Vibration. 2009, 323(3-5):495-514.

Hot Deformation Behavior during the Hot Compression of AZ31 Alloy Shuli SUN a, Mingang ZHANGb, Wenwu HEb, Junqi ZHOU b, Gang SUN b School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi, China a sun-shuli@163.com, bmgzhang@163.com Keywords: AZ31 magnesium alloy, Activation energy, Dynamic recrystallization, Hot processing Map Abstract.
Chen: Material Processing Technology, Vol. 208 (2008), pp. 29-34
Cheng: Materials Science & Engineering, Vol. 26 (2008), pp. 406-410 (in Chinese)
Li: Computational Materials Science, Vol. 41 (2008), pp. 375-382
Chen: Chinese Journal of Nonferrous Metals, Vol. 15 (2008), pp. 900-906(in Chinese).

By using different materials with higher GF; ultra-sensitive strain gauges could be produced.
Among these materials are graphene and carbon nanotubes (CNTs) with their attractive piezoresistive properties [1].
Offeman: Journal of the American Chemical Society Vol. 80 (1958), p. 1339 [7] J.
Li: Journal of Micro/Nanolithography MEMS and MOEMS Vol. 12 (2013), id.013009 [18] X.W.
Zhang and et al.: Applied Physics Letters Vol. 99 (2011), id. 213107 [19] Gamil et al.: Key Engineering Materials Vol. 605 (2014), p. 207 [20] V.

Research on Inverse Extrusion Process of High-tin Wear-resisting Cu-Sn-Pb-Ni Alloy Yanjun Zhou 1, 2, a, Kexing Song 1, 2, b, Yuanjing Cai3, c,Jun Wei3, d， Guanfeng Zhai3, e， Yanmin Zhang 1, 2, f and Peifeng Zhao1, 2, g 1School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China 2Henan Key Laboratory of Advanced Non-ferrous Metals, Luoyang 471003, China 3Henan Jianghe Machinery Co, Ltd., Pingdingshan 467337, China adazhou456@163.com,bkxsong@mail.haust.edu.cn, cjhcaiyuanjing@163.com, djhweijun@163.com, ezhgf49@163.com, fzhangmin70@163.com, gzpf_1972@163.com Keywords: tin bronze; extrusion process; dentity; microstructure Abstract.
Acknowledgements We are grateful to the National Natural Science Foundation of China (51075122); The State Key Program of National Natural Science of China (U1034002); National Natural Science Foundation of China (50871085); Henan Science and Technology Innovation Fund for Distinguished Young Scholars (094100510005).
Lee: Materials Characterization Vol. 60 (2009), p. 1268-1275 [2] Q.S.
Duo, M.X: Foundry Vol. 9 (2005), p. 75-76, In Chinese [4] X.P.Fan, C.S.Wang, P.J.Jin: Journal of Chinese Society for Corrosion and Protection Vol. 28 (2008), p. 113-115, In Chinese [5] J.W.Chen, Z.P.Ye, Y.W.Zeng, etc: Journal of Materials Science and Engineering Vol. 18 (2000), p. 69-73, In Chinese [6] Y.H.Hong, X.J.Yao: Machinery Design & Manufacture Vol. 2 (2010), p. 135-136, In Chinese [7] Y.A.Xiao, Y.J.Zhang, F.M.Shi: Special Casting & Nonferrous Alloys Vol. 3 (1981), p. 27-31, In Chinese [8] M.Aksoy, V.Kuzucu, H.Turhan: Materials Processing Technology, Vol 124 (2002), p.113-115 [9] Z.X.Wang, F.S.Yuan, J.Wang, etc: Mining and Metallurgical Engineering Vol. 3 (2010), p. 203-206, In Chinese

This bonding character helps to explain the extreme hardness of this kind of materials.
Solar Energy Materials, 1990, 20 (5 - 6: 455- 465)
Materials Letters, 2005, 59: 3929-3932
Materials Science and Engineering,2003,342:58-79
CHINESE JOURNAL OF HIGH PRESSURE PHYSICS.

Materials and Methods The specimens used in this research were Ti-6Al-4V plates (15.5 mm x 4 mm x 0.6 mm).
Macaluso, Titanium dental implants hydrophilicity promotes preferential serum fibronectin over albumin competitive adsorption modulating early cell response, Materials Science and Engineering: C (2020) 111307
Kalbacova, Biological evaluation of ultra-fine titanium with improved mechanical strength for dental implant engineering, Journal of materials science 51 (2016) 3097-3110
Sidhu, Evolution of surface modification trends in bone related biomaterials: A review, Materials Chemistry and Physics 233 (2019) 68-78
Hüttig, Surface characteristics of dental implants: A review, Dental Materials 34 (2018) 40-57.

Synthesis or preparation is the foundation of the research and application for all the materials.
At present, there are two main approaches to synthesize nc-materials.
Thermal stability is an important character for nc-materials because the nc-materials may lose its unique properties when the average grain size exceeds 100 nm.
Nc-materials with good thermal stability could be applied at relative high temperatures.
[6]W.Liu, Y.J.Tang, and G.Chu, Materials Science and Technology, 14(2006)127-130

We consider a situation where manufacturing a remanufactured product by reusing a waste product is less expensive than producing a new product from raw material, i.e., cr +A< cn..
Roth, Competitive advantages through take-back of used products, European Journal of Operational Research. 164 (2005) 143-157
Savaskan, L.N.Van Wassenhove, Reverse channel design: The case of competing retailers, Management Science. 52 (2006) 1-14
Swaminathan, Managing new and remanufactured products, Management Science. 52 (2006) 15-26
Swaminathan, Managing new and differentiated remanufactured products, European Journal of Operational Research. 203 (2010) 370-379

Firstly, we used to define the counterforce of materials of blade.
The friction force of materials of blade is proportional toshown in Eq. 2
We can refer the allowable stress of material of propeller =[4] from Mechanical Engineering Materials Manual.
Journal of Chang an University: Natural Science Edition,2006,26(5):99- 102, in Chinese [3] Hui-zhu SAN.Mechanics of Meterials.
Mechanical Engineering Materials Manual (Ferrous Material).

Materials and Methods Experimental animal.
References [1] Jun He, Zhiqing Ma, Xing Zhang: Journal of Northwest Sci-Tech University of Agriculture and Forestry (Natural Science Edition) Vol. 34(2006), p. 79-85, in Chinese
[2] Ling Qin, Feng Tang: Journal of Anhui Agricultural Sciences Vol. 38(2010), p.15690-15691, in Chinese
[7] Wenqiao Wang, Jinduo Liu, Wenyuan Zhang et.al: Journal of Hebei Agricultural Sciences，Vol. 9(2005), p. 74-79, in Chinese
[10]Hairong Wu, Sheng Qiang, Hui Duan et.al: Weed Science, (2004), p.50-52, in Chinese [11]Guocai Zhang, Yang Zhao, Li Ma et.al: Journal of Northeast Forestry University Vol. 38(2010), p. 94-96, in Chinese