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Extracting of Weak Periodic Impact Feature Based on Mean Filtering and Wavelet Transform Du Feia and Ma Tian-bingb School of Mechanical Engineering, Anhui university of science and technology Huainan, China adfmtb@163.com, btbma@aust.edu.cn Keywords: Weak periodic impact; mean filtering; wavelet transform; feature extracting.
YANG Fu-chun[3] proposed a new method for extracting weak impulse characteristic based on the sliding kurtosis algorithm.
References [1] LU Yong, LI Yourong, and WANG Zhigan,“Research on a extraction method for weak fault signal and its applicatio,” Journal of Vibration Engineerin, Vol. 20, Feb. 2007,pp. 24-28 [2] LU Yong and XU Jinwu,“Weak Feature Signals Identification Method Based on Local Projective and wavelet Transform,” Journal of University of Science and Technology Beijing,Vol. 26, Jun. 2004,pp.319-321 [3] YANG Fuchun, ZHOU Xiaojun and ZHANG Zhigang,“A new m ethod for extracting weak impulse characteristic based on a sliding kurtosis algorithm,” Jounal of vibration and shock, Vol 28 ,Apr. 2009,pp.103-109　 [4] SHAO Yimin and ZHOU Xiaojun,“Extracting Impact Feature of Machine Fault by Using Enhanced Filtering,”.Jounal of mechanical engineering, Vol.45, No.4 ,Apr. 2009,pp.166-171 [5] Fan Shengbo and WANG Taiyon,“Detection of Weak Periodic Impact Signals Based on Scale Transformation Stochastic Resonance,”China mechanical engineering .vol17,No.4,Feb. 2006,pp.387-390 [6] SU Yongsheng, WANG Yongsheng
“Feature Extraction Method for Impulse Signal Based on Time- Frequency Transform and Resonance Demodulation,” Noise and vibration control, No. 3, Jun,2009,pp.19-21 [7] WU Fang and YANG Rijie, “Weak Signal Detection Based on Correlation and Wavelet Transform,” Journal of Naval Aeronautical and Astronautical University, Vol. 23, No.1,Jan.2008,pp.26-28 [8] ZHENG Zhizhen,“Wavelet transform and MATLAB tool applications,” Earthquake press,Oct,2001 [9] TANG Jinyuan,CHEN Weitao and CHEN Siyu, “Wavelt-based vibration signal denoising with a new adaptive thresholding function,”Vol.28,July,2009,pp.118-121

Visualization experimental study on Organic-Inorganic Crosslinked Plugging System plugging YANG Jianping1a 1SAGD Development Project Management Department of Liaohe Oilfield Company, PetroChina, Panjin 124010, P.
Meanwhile, it exhibits excellent thermostability, good shear properties, good plugging performance and washable characteristic, it improves on sweep efficiency in low-permeability layer, as well as plugging water effectively and displacement of reservoir oil(Yang et al, 2012; Dong, 2009; Zhao, 2013).
After the organic-inorganic crosslinked plugging system injected in layer, because of the difference of permeability and the existence of microfracture, it entrances in most permeable zone and crack layer, forming low permeability protective screen under layer temperature conditions(Liu et al, 2001; Li et al, 2010; Tian et al, 2007).
[3] YANG JianQing, LI Liang and LIU XueZhe, et al.
[8] TIAN shizhang, WANG yongzhi and YAN wanhong.

Yang, B.
Yang, Y.L.
Tian: Tetrahedron.
Yang: Dyes and Pigments Vol. 90 (2011), p. 71 [7] S.Z.

He Yang, Northwestern Polytechnical University, China Prof.
Tian Huang, Tianjin University, China Prof.
Daoguo Yang, Guilin University of Electronic Technology, China Prof.
Junhe Yang, University of Shanghai for Science and Technology, China Prof.

Tian and Y.L.
Yang and J.K.
Yang and G.Z.
Yang, J.K.

Numerical simulation of dual-support leg fluidized bed Qinliang Tan2, Tian Liu1,a, Dalong Jiang1, Xiaoying Hu1 and Changqing Dong*1,b 1National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing, China, 102206 2North China Electric Power University, Beijing, China, 102206 aliutian0128@hotmail.com, bcqdong1@163.com *Corresponding Author, Tel & Fax: 86-10-61772031, E-mail: cqdong1@163.com Keywords: Dual-support leg fluidized bed, MFIX, Multiphase flow, Two-dimensional.
Yang, J.F.
Yang, Y.H.

Tian Yuan et al. [2] introduced the basic performance of meshy aluminum alloy material and analyzed the factors affect the performance of meshy aluminum alloy material according to the experiment of EXess Company of Switzerland.
References [1] Lifeng Xie; Jinghong Wang; Lifang Rao and Bin Li: Petroleum chemical safety and environmental protection technology. 2010,26(1):34-37（published in Chinese) [2] Yuan Tian; Weifang Gu and Hong Tian: Industrial Safety and Environmental Protection. 2007,33(3):38-40（published in Chinese) [3] Xujie Lu and Bangqin Ding: The journal of the Institute of project of Shen Yang (natural science edition) .2006,2(2):176-178（published in Chinese) [4] Shuyou Wang; Yingmin Zheng and Xiaohui Gu: Explosive Materials. 2005,34(3): 36-38（published in Chinese) [5] Zijiang Nan; Ai-ying Shong; Fa Cao and Bingyuan Fan: Ordnance Material Science and Engineering. 2001,24(4):19-22（published in Chinese) [6] Hongwen He and Jinyuan Cheng: Electric Explosion Protection. 2005:35,36（published in Chinese)

In the literatures, there’re no uniform in the test methods, for example, literature [[] YANG Cheng-qiu.
Jun-tao TIAN [[] TIAN Jun-tao, JIANG Fu-tian.

Tian et al in [9] construct a neural network and the mean square error is selected to estimate the performance of network so as to achieve the goal of prediction error minimum.
Yang, T.
Tian, An artificial neural network method for remaining useful life prediction of equipment subject to condition monitoring, Journal of Intelligent Manufacturing, 23 (2012) 227-237
Tian, L.

Experimental section Materials Aniline monomer (Tian Jin GuangFu Chemical Co., China) was distilled under reduced pressure.
VCF (Tian Jin Institute of Functional Fibers, China).
Ammonium persulfate (APS, Tian Jin GuangFu Chemical Co., China) were used as received.
Yang, L.T.