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There are some disadvantages of chemical synthesis and microbial fermentation such as it is difficult to obtain materials, difficult to purify, easy to lead into contamination, etc.8-10 Extraction L-theanine from the tea is the most direct, effective and safe process.
Integrating Eqs. (5)-(7), the molar fractions of theanine in the feed, membrane and receiving phase will be expressed as: (8) (9) （10） Where is defined as: (11) (12) Experimental Materials L-theanine was purchased from Xiyashiji Company, in China.
Rajput: JOURNAL OF RARE EARTHS, 2010 28( 1), 1 [4] Ma M, He D S, Liao S H, et al: Analytica Chimica Acta, 2002, 456: 157 [5] I.
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H, et al.: Journal of Tea Science, 2007, 27(2)：111 [13] Chen Y., Zhong JH., Tao WY.: AMINO ACIDS & BIOTIC RESOURCES. 1998, 2(10):34 [14] ZHU XL, CHEN B, LUO XB, et al.: Chinese Journal of Chromatography, 2003, 21(4): 400

Precision agriculture technology was considered to be the forefront of agricultural science and technology development in the 21st century, one of the modern agricultural production and management technology with the highest content of science and technology, the strongest integrated comprehensiveness.
References [1] Yu Lifeng, Xiao Xinmei, Lan Haijun, Present status and development tendency of agricultural mechanization at home and abroad, Journal of Hubei Agricultural Mechanization, 2007(5), p.36-37
[3] He Baojun, Enlightenment of Foreign Agricultural Mechanization Development Situation to Our Country, Journal of Commercial Economy, 2012(2), p.13-15 [4] Han Xiuhai,Wang Tao,Hou Guoqiang,Research on the Rice Seedlings and Planting Mechanization Technology, Journal of Agricultural Mechanization Research, Vol.31(11), 2009,p.250-252
[5] Yang Hongwei, Research and Application of Intelligent Consultation and Diagnosis Platform with Intelligent Materials for Rice Pests and Diseases, Advanced Materials Research,V644, P.8-11, 2013, Advanced Research on Intelligent System and Mechanical Engineering
[6] Cao Xingqi, Research on the Development in Overseas Agricultural Mechanization, Agricultural Science & Technology and Equipment, 2012(2), P.78-79

Materials and Experiment The chemical composition of 3003 Al-Mn alloy is shown in tab.1(mass fraction).
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Materials and methods Materials.
The study of mechanical properties is of primary importance for determining the performance of materials, especially that of film materials.
Photographs of the bone marrow mesenchymal stem cell cultured on the various materials were shown in Fig. 6.
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The absorption properties of the eosin dye to the nano materials TiO2 were examined.
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In 1976, Dougill first proposed the study of rock material damage mechanics, which introduced the concept of damage to the study of rock [1].
Acknowledgments Supported by the National Natural Science Foundation of China (11172232, 41272340), Natural Science Foundation of Shaanxi (2011JM1003), New Century Talent Support Program of Ministry of Education(ACET-12-1044) and the Special Foundation of Education Department of Shaanxi (11JK0525, 11JK0542).
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The material of two parts is mild steel with Young’s modulus and Poison’s ratio .
Acknowledgement This work was financially supported by the national natural science foundation of china (No. 51105241, 51175320), Shanghai natural science foundation (No. 11ZR1414700).
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In this study, corrosion property of both weld metal and base metal was investigated with some electrochemical methods in natural sea water solution, in case of being welded with some welding methods and welding materials to the exhaust valve specimen as the base metal.
In this study when repair welding with various welding methods and welding materials like foreign and domestic electrode was performed at the exhaust valve part as the base metal, corrosion property of both base and weld metal were investigated with some electrochemical methods such as corrosion potential, polarization curves, cyclic voltammogram etc.. 2.
Experimental procedure Ni-Cr steel(KS:STR-3) was used with base metal(BM) and stellite electrode was also used for repair welding materials with foreign and domestic electrode respectively.
Conclusions When repair weld was performed at the exhaust valve with some parameters such as welding methods, welding materials, corrosion resistance between base metal and weld metals was investigated with electrochemical view point.
Corrosion resistance of weld metal irrespective of welding methods and welding materials was clearly superior to the base metal.

Acknowledgements The work was financially supported by the Support Plan of Science and Technology Innovation Team in Henan University, China (13IRTSHN002), the Scientific and Technical Leader Raising Plan of Zhengzhou City, China (No. 096SYJH23105), and the Cultivating Base for Key Lab of Eco-building Materials in Henan University, China ( 2009-609).
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Zheng, Calculation of punching strength of lightweight aggregate concrete slab based on reliability analysis, Journal of Fuzhou University (Natural Science Ed.), Vol. 21 1 (1993) 63-69