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The design requirement: type--compression spring; free height--approx. 15. 1. valve housing 2.weight valve 3.spring 4.spring guide 5.adjusting nut Fig. 1 Profile of WTD valve assembly of X engine (a) WTD valve at the topmost of the engine; (b) WTD valve at the bottom of the engine Fig. 2 Illustration of operating principle of WTD valve According to the material property of the spring and the associated requirements about type, working load and height in position etc., combining the influencing factors to be considered in spring design, using spring design formulas introduced by Carlson [15], the anticipated height of spring was given an initial calculation and the result is to be 15.34-15.89.
Weiss: Journal of Industrial and Engineering Chemistry Vol. 47(8) (1955), p.1634-1643 [7] O.
Nishimoto: Combustion Science and Technology Vol.6 (1972), p.1-10 [12] D.R.

Grey prediction model for forecasting the planning material ofequipment spare parts in navy of Taiwan.
European Journal of Operational Research, 173: 801-814
Operations Research and Management Science.

Luo Yun etc. [3] proposed that effective enterprise security management is the use of human and material resources with wisdom of all staff, and through the joint efforts to achieve harmony between human and machine, equipment, technology, environmental condition during production process, finally to achieve the goal of security production.
China Safety Science Journal,2012,08:22-28

There is a 10cm deformation joint between adjacent lining structure sects with 10m length, and it is filled with flexible sealed impermeable material (Fig.1).
[4] Jingming Wang: Theory of ground fissures hazards and application(Shaanxi Science and Technology Press,Xi′an,2000),in Chinese
[5] Qiangbing Huang, Jianbing Peng, Wen Fan, et al: Journal of Engineering Geology Vol.4,(2007),p. 469–474,in Chinese

An Experimental Study of Low-frequency Vibration-based Electromagnetic Energy Harvesters Used While Walking Min-Chie Chiu1, a, Ying-Chun Chang*2,b, Long-Jyi Yeh*2,c, and Chiu-Hung Chung2,d and Chen-Hsin Chu 2,e 1 Department of Mechanical and Automation Engineering, Chung Chou University of Science and Technology, 6, Lane 2, Sec.3, Shanchiao Rd., Yuanlin, Changhua 51003, Taiwan, R.O.C. 2 Department of Mechanical Engineering, Tatung University, No.40, Sec. 3,Zhongshan N.
Moreover, the adjustable inertia counterweight (a copper material with weighing 43 grams) which can change the system’s resonant frequency is added along the linkage bar (300 grams).
Holmes: Journal of Microelectromechanical Systems Vol.13 (2004), p. 429 [4] P.D.

Material forming technology[M].
Journal of Anhui metallurgy science and technology vocational college, 2005,S2:30-34

Wendell, Assessing attribute weights by rations, The International Journal of Management Science. 2-1 (1983) 9-13
Rosová, The system of indicators of distribution logistics, transport logistics and material flow as a controlling tool in the company logistics, Acta Montanistica Slovaca. 15-1 (2010) 67-72

Compared with tooth cutting, fine forged gears have many advantages in life, energy and material saving, etc.
According to the modified gear configuration, mathematical model is built to calculate the demolding check at any modification points on the fine forged spur bevel gear profile.A corresponding program is developed, and practical calculation has carried out.It is proved that the method accompanied the program can be used as the main tool for the bevel gear tooth profile modification design. 2.5 3 3.5 4 4.5 5 24.9448 26.1947 27.4447 28.6947 29.9447 31.2447 32.4946 Value of Rk Chordal tooth thickness Z value of protection point Z value of affected demolding point when the modification depth is 0.03 Z value of affected demolding point when the modification depth is 0.05 Acknowledgement The authors would like to acknowledge the financial support by Shandong Provincial Excellent Young Scientist Prize Fund (2007BS0516),Shandong Provincial Nature Science Fund (Y2008F21)and Shandong Provincial S&T Developing Program(2009GG10004003).
[3] Y.Y.Tang:Journal of Harbin Institute of Technology Vol.(1)(1983),p.20 [4] State-operated Diesel Factory of Weiyang: Spur Bevel Gear (National Defense Industry Publications, China 1978).

The chronoamperometric technique is an effective method to evaluate the electrocatalytic activity and stability of electrode material.
Acknowledgements The authors wish to thank the following project for financial support:(1) Natural Science major basic research projects of Jiangsu Higher Education Institutions (08KJA480001); (2)Applied Research Plan Projects of Nantong City (No.K2009007); Nantong City Key Laboratory of Fuel Cell (No.
Vol.9 (2007),p.2654 [6] A.Varesano,A.Montarsolo and C.Tonin:European Polymer Journal Vol.43 (2007),p.2792 [7] H.Tao,A.L.Yarin and D.H.Reneker:Polymer Vol.49(2008),p.1651 [8] F.P.Hu and P.K.Shen: J.

It has a unique advantage in its research on the motion and interaction of loose bulk material through the simulation analysis of the clearing procedure in precision metering device with combination inner-cell, the waterproof pillar to coal seam mining goaf beside large fault and jacked piles during installation in sand.
[2] Xiaojing Feng, Xin Yang, Yongying Sang, etc., Situation of corn precision seeding machine [J], Jiangsu Agricultural Sciences 4 (2010) 422-424
Forssberg, Computer simulation for particle packing phenomena [J], Journal of The Chinese Ceramic Society 31(2) (2003) 169-178