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Moreover, rubber is a kind of elastic material with internal friction damping characteristic, which causes the strain hysteresis[4].
Acknowledgements The authors would like to thank the financial supports of Anhui Provincial Education Department Natural Science Foundation (Grant No.
(In Chinese) [3] Shangguan Wenbin,Lu Zhenhua: Journal of Vibration Engineering,2003,16(4),pp.393-398.
Peng: Journal of Sound and Vibration,318 (2008),pp.313–328

Material and Methods Three lakes in UPM known as Lake IT, Lake ENG and Lake PK are chosen in order to investigate the level of contaminant (Phosphorus, Lead and Copper) which are suspected presents in lake sediment (Fig. 1).
European Journal of Scientific Research 26(3): 437 - 442(2009) [2] I.
Journal Environmental Quality, 7: 301–305 (1977)
Environmental Science & Technology.

Introduction The prosthetic screws for dental implants are parts which meet shape and material special conditions, adapted to the purposes of their utilization [1].
Nowzari, Clinical Evaluation of Dental Implants with Surfaces Roughened by Anodic Oxidation, Dual Acid Etched Implants and Machiden Implants, The International Journal of Oral & Maxilofacial Implants, (2005), pp. 793-798
Oancea, 3D Graphical Method for Profiling Tools that Generate Helical Surfaces, The International Journal of Advanced Manufacturing Technology, DOI: 10.1007/s00170-011-3637-3
Ivanov, CAD Oriented Mathematical Model for Profiling of Tools For Machining of Helical Surfaces, International Science Conf.

Because material of drive port is same, we can merge primary function, and obtain two port networks admittance matrices.
Acknowledgements The China Guangdong Natural Science Foundation (S2011010004487) financially supports this work.
[4] Hu M.Z., Yin C.Y., Xiong J.Q., Song Z., Zhang Y.Y., Full wave analysis for cylindrical microstrip dipole antenna based on RWG-MoM, Journal of Microwaves, 26-6 (2010) 7-12
[5] Song Z., Hu M.Z., A current efficient full wave analysis method for the impedance of microstrip antennas, Journal of Microwaves, 23-6 (2007) 32-35

The Failure Finite Element Analysis of Pump Collision with Valve in the Oil Well Pump Suling Wang1, a, Ying Zhang1, b, Nanyang Bai1, c and Yumiao Cai1, d 1College of Mechanical Science and Engineering, Northeast Petroleum University, Daqing, Heilongjiang, 163318, China awsl19751028@163.com, bzhangyingandlilili@163.com, cbbb727601507@163.com, dcymiao@126.com Keywords: Pump, Valve ball, Valve housing, Impact, Failure.
The stress of the extended grooved valve is 232.7MPa, the material for the valve cover 9Cr18Mo quenched, according to the theoretical calculation of the fatigue life.
[5] Shimin Dong, Chundong Yao: Journal of System Simulation.
[6] Zhanyu Ge, Yanfeng Lu: Journal of university of petroleum.

Differential Drive Servo Valve based on MSMA YU Chao1, a, CHEN Kuisheng1,b and FU Shuguang1,c 1Wuhan University of Science and Technology, Wuhan, 430081, China aforeveryuchao0913@163.com, bwustyy6@126.com, cwustfu@gmail.com Keywords: MSMA, Differential drive, 2D servo-valve, Simulation Abstract.
The material of the permanent magnet is Nd-Fe-B N35, its residual magnetic flux density is.
Journal of Zhejiang University of Technology Vol.4(2011), p.429, in Chinese
Journal of Liaoning Technical University Vol.05(2007), p.723, in Chinese

Study on Bridges’ Global Flexibility Index for Ambient Vibration Qing Du1, 2, a, Hongyu Jiang1, b ,and Xiaohui Li3,c 1College of Civil Engineering, Hebei University of Technology, Beichen District, Tianjin, China, 300401 2Engineering Technology Research Center of Hebei Province, Beichen District, Tianjin, China, 300401 3College of Science, Hebei University of Technology, Beichen District, Tianjin, China, 300401 ahebutdq@sina.com, bhongyujiemei@163.com, clixiaohui@hebut.edu.cn Keywords: Global Flexibility Index, Flexibility Matrix, Ambient Vibration.
The finite element model calibrate the material characteristics and geometrical features consist of mass density of the concrete(ρ), modulus of elasticity(modulus of elasticity) and thickness of deck paving(h) as parameters.
References [1] Anun Patjawit and Worsak Kanok-Nukulchai: submitted to Journal of Structural Engineering.
[2] Raghavendrachar and M, Aktan AE: submitted to Journal of Structural Engineering (1995)

So, the stress-strain formula of concrete under long-term loading is (1) Age adjusted effective modulus is (2) Aging coefficient is (3) Creep analysis models Supposing concrete is elastic material, and deformation of beam is accordance with plane section assumption, as well as the interface of steel and concrete keep well bonding and has no slip.
Building Science, Vol.2(1991), P. 3-8.
ACI Journal, Vol.69(1972), P. 212-217 [6] Baojun Sun.
China Civil Engineering Journal, Vol.3(1993), P. 66-68.

The use of plate thickness 4mm plexiglass plate design 8 perforated plate, orifice with area staggered hole arrangement, in order to observe the cavitation state, perforated plate and the occurrence of cavitation section with see-through plexiglass material.
,Pandit A.B, Water disinfection acoustic and hydrodynamic Eng.Journal 2001,7:201-212
[7] Chen Lijun,Wu Chunde,Zhang Jiexin, Hydraulic cavitation applications in water treatment research progress [J].Ecological science,2006,25(5):476-479.
(In Chinese) [8] Xu Meijuan,Wang Qishan, Characteristics of perforated plate on hydraulic cavitation - Fenton reaction processing effect of wastewater[J].Journal of Tianjin University, 2012,45(7):615-620.

The material of the girder/double thin-wall piers of the bridge is C50 concrete, of which density is 2500 kN/m3, the elastic modulus 35000 MPa and poisson's ratio 0.167; the diameter of the 1860 prestressed steel strand is 15. 24 mm, density 7710 kN/m3, elastic modulus 190. 0 GPa and poisson's ratio 0.3.
References [1]Maeda K, A, Takano H:Tokyo: Elsevier Science Publisher (1991) p.377
[3]Mari AntonioR, Valdes Manuel:Journal of Bridge Engineering Vol.5 (2000) p22
[8] M.Z.Cohn, Z.Louis: Journal of Structural Engineering Vol.120 ASCE(1994) p.474