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It is a decay product of 238U and has a half life of 3.82 days [4]. 238U has a strong association with phosphate ore, which is the major raw material for the production of phosphate fertilizers.
[2] Committee on Health Risks of Exposure to radon BEIR VI, Health Effects of Exposure to radon, Board on Radiation Effects Research, Commission on life Sciences.
Salih, Design and Fabrication of New Radon Chamber for Radon Calibration Factor of Measurement, International Journal of Scientific & Engineering Research 3(2012) 1-6
Chauhan, R.P Chauhan, Elemental analysis of fertilizers using -ray fluorescence and their impact on alpha radioactivity of plants, Journal of Radioanalytical and Nuclear Chemistry, 295 (2013) 1097-1105

Secondly, in the view of structural mechanics, cables can provide an explicit path of force transferring with light self-weight which also can make full use of the material property.
Journal of Building Structures,Vol22(2001),p.18
[4] DONG Shi-lin, ZHUO Xin.Journal of Zhejiang University(Engineering Science), Vol37(2003), p.629.

It 1is refers to the construction of the whole life cycle, utmost to save resources (energy-saving, land-saving, water-saving, material-saving), protect environment and reduce pollution, provide people with health, applicable and efficient use of space and the natural harmonious coexistence of architecture[4].
In Britain and the United States green (sustainable) building evaluation standard of comparison [D]. master's degree thesis of Beijing Jiaotong University, 2010 (In Chinese) [2] Yanan Li, Li Yang, Baojie He, Doudou Zhao: Sustainable Cities and Society Vol. 1-6 (2014), p.11 [3] Lei Wang, Anne Toppinen,Heikki Juslin: Journal of Cleaner Production Vol. 350-361 (2014), p.65 [4] Sen Ye.
A comparative study on green building assessment system to China -- ESGB and CASBEE Japan as an example [D]. master's degree thesis of Kunming University of Science and Technology, 2011(In Chinese) [5] Weiwei Yu.
Green building evaluation standard certification system comparative study of China and the United States [D]. master's degree thesis of Chongqing University, 2008(In Chinese) [6] Yingxin Zhu, Ling Song,Jérôme Damiens: International Journal of Sustainable Building Technology and Urban Development Vol. 178-184 (2013), p. 4 [7] Mi Jeong Kim,Myoung Won Oh,Jeong Tai Kim: Energy & Buildings Vol. 203-210 (2013), p. 66 [8] AmirHosein GhaffarianHoseini, Nur Dalilah Dahlan, Ali GhaffarianHoseini, NastaranMakaremi, Mahdiar GhaffarianHoseini: Renewable and Sustainable Energy Reviews Vol. 1-17 (2013), p. 25 [9] Wei Zhang.

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.

Acoustic Information Acquisition and Time Domain Analysis on Alternating Current Rail Flash Butt Welding Qibing Lv 1, Keli Tan 1, Xi Zhang 1, Jian Chen 2, Guoqing Liu 1 1 College of Material Science & Engineering, Southwest Jiaotong University, Chengdu 610031, China 2 Southern Railway Locomotive Vehicle Technology Institute Qi Shuyan Co., LTD, Changzhou 213011, China E-mail: xnjdlvqibing@163.com Keywords: AC Flash-Butt Welding, Acoustic Signal, Flash Stability, Labview Abstract.
Welding Journal, 2005, 26(5): 65-68
Welding Journal, 2008, 29(2): 93-96

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