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Domestic and foreign experts in the field of bionic non smooth surface drag reduction technology has made significant achievements, such as Bearman, Yang Hongwei and Ren Luquan respectively proposed that the concave surface can reduce the resistance of cylinder[1-4], Lim found that the convex ring on the cylinder can reduce 9% of the resistance[5].
[2] Yang H W, Gao G.
(In Chinese) [3] Ren L Q, Zhang C C, Tian L M.

[4] ZHAO Yang-feng,ZHANG Hua-xing,PAN Yi-shan.
[6]LIU Tian-quan.
[7]YANG Ming,MENG Xiang-rui,GAO Zhao-ning.

Qingxing Yang [3] designed a device used to dredging the tube’s inner wall.
References [1] TIAN Jie,DENG Hui-hua,ZHANG Ping,ZHAO Han.
May, 2007, pp.791-799 [3] YANG Xin-qing,YAN Hang-zhi,FU Wei-hua.

[2]YANG Cong-feng, YAO Xin-gen, Exploration of the Ways of Tourist Souvenir Development[J].
[5] LUO Shi-jian, ZHU Shang-shang, YING Fang-tian, HE Ji.
Computer Integrated Manufacturing Systems. 2009, 15(12) [6]CAO Xu-yang, TENG Ru-ming, WANG Xin, GAO Shun-de. 

[4] Feng Xu, Maijiu Tian.
[8] Huiling Yang, Huiwei Yang, Jun Wang.

[2] MA Ling-ling, YANG Jun, FU Cong, et al.
[5] TIAN Wen-qi, HE Jing-han,JIANG Jiu-chun,et al.
[7] YANG Bing, WANG Li-fang, LIAO Cheng-lin.

[3] Ling Tian.
[4] Zhibing Yang, Yuwen Zhang, Yunyan Zhang.
[8] Lihong Gong, Xueqing Sha, Yang Gao, [J] Natural Science Journal of Harbin Normal University, 2002, 18 (3): 57-59.

Yang: MEMS and Relative Technology (Shanghai Jiaotong University Press, China 1999) [2] S.Y.
Yang and C.L.
Tian: High speed Grinding Technology (National Defense Industry Press, China 2003) [5] F.G.

Yang, H.
Tian, Y.
Yang, K.

Reference [1] Guangwei Zhu,Yingxu Chen, Guangming Tian.
(In Chinese) [2] Wenxia Li, Haiyan Feng, Zhongfang Yang,ect.
(In Chinese) [3] Kai Luo, Lieshan Wu, Xi Yang, ect.