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Migration of Thermal Vacancies in Quenched Pure AA1050 by Positron Annihilation Emad A.Badawi*, M.A.Abdel-Rahman, E.M.Hassen, M.Abdel-Rahman and M.O.Abdel-Hamed Physics Department, Faculty of Science, El-Minia University, El-Minia, Egypt *emadbadawi@yahoo.com Keywords: AA1050 Ingot, Lifetime, Migration Enthalpy, Thermal Vacancies Abstract A description of positron annihilation spectroscopy (PAS) in solids is given in terms of a trapping model.
References [1] D.Sampath et al.: Materials Science Forum, 1996, 217-222, 747 [2] B.T.A.Mckee, H.M.B.Bird and I.K.Mackenzie: Bulletin of the American Physical Society, 1967, 12, 687 [3] J.C.Grosskrentize and W.E.Millet: Physics Letters, 1969, 28A, 621 [4] M.A.Abdelrahman, E.Badawi, E.M.Hassan and G.Yahya: Turkish Journal of Physics, 2002, 26, 381 [5] W.Brandt: Proceedings of the International Conference on Positron Annihilation, Eds.

A small part of it is used for production of building materials or other new projects. [3] Emphasize much on wastewater treatment but neglect the sludge treatment, scarce capacity, ambiguous responsibility.
(In Chinese) [6] Wenping Huang: Environmental Science,Vol.24 No5 (2010), p67-69.
(In Chinese) [7] Jie Xu, Ningning Tian, Kaijun Wang, Yuan Ren: Journal of Environmental Sciences,Vol.1 No.1 (2007), p.82-86.

Optimal Design and Structural Precision Analysis for a Spherical Coordinate System 3D Scanner Guiding Device Sangwook Park1,a, Hee-young Maeng2,b,# and Juwook Park3,c 1Graduate School of Mechanical Design and Robot Engineering, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul, Korea 2, 3Department of Mechanical System and Design Engineering, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul, Korea adoolison@seoultech.ac.kr, bmaeng@seoultech.ac.kr, cjuwook89@naver.com Keywords: 3D scanning device, Optimal design, FEM analysis, NC rotary table Abstract.
The deformation characteristics of the arm structure depend on its geometrical factors and material properties.
Mechanical properties of tested model Material Condition SM45C Aluminium alloy Density [kg/m3] Young’s modulous [GPa] Possion’s ratio 7850 200 0.3 2770 71 0.33 (a) (b) (c) Fig. 5 The boundary conditions of the model (a), (b), The finite element model of this system (c) (a) (b) Fig. 6 The stress-strain curves of enhanced stiffness model, the initial position (a), the horizontal position (b) (a) (b) Fig. 7 The stress-strain curves of final model, the vertical position (a), the horizontal position (b) Table 2.
[2] Maeng, H., Sung B., Development of 3D Measuring System using Spherical Coordinate Mechanism by Point Laser Sensor, Journal of the KSMTE, Vol. 19, No. 4, pp. 427~433

Acknowledgement This study was supported by the Nation Nature Science Foundation of China (50276042, 50776062, 51276128), the National High Technology Research and Development Program of China (863 Program) (2008AA06Z322), and the Tianjin Research Program of Application Foundation and Advanced Technology (11JCZDJC23200).
[4] Aexl Koning,et al．Rearch Results on Processes and Catalyst Materials for Lean NOx Conversion[A].
,Recent progress in NOx-trap technology，[A]SAE Paper[C] 980933,1998 [8] Li Zhijun, Zhang Guangyu, Liu Shuliang et al:An Electronic Control System Development of Reducing NOx Emission in a Quasi_Homogeneous Lean Burn Gasoline Engine [J] JOURNAL OF COMBUSTION SCIENCE AND TECHNOLOGY,Vol.10 No.5,2004.

Limited Irrigation System of Spring Maize in a Semi-arid Area of Northeast China Guanghua YIN1,a*, Wenhui LI1,2,b, Jian GU1,c, Liang HAO1,2,d, Zuoxin LIU1,e 1Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 2University of Chinese Academy of Sciences, Beijing 100049, China aygh006@163.com, b972074157@qq.com, csygj981@163.com,dhaoliang10@mails.gucas.ac.cn, eliuzuoxin@iae.ac.cn Keyword: spring maize; limited supplementary irrigation; production; water consumption; water use efficiency.
Materials and Methods 1.1 General situation of study test area The experiment was conducted in the Fuxin Mongolian Autonomous County of northeast semi-arid regions from April to October 2009.
Agronomy Journal, 1998, 90:672-681.

Acknowledgments The authors would like to thank the support of National Social Science Foundation of China (12CJY033); Youth Project of Humanities and Social Sciences, Chinese Ministry of Education (11YJC790191).
Chinese Journal of Mechanical Engineering Vol. 31(2011), p.1-8.
Advanced Materials Research Vol. 518-523(2012), p.1117-1122

Particle Swarm Optimization for Cylinder Helical Gear Multi-objective Design problems Mo Yuanbin College of Mathematics and Computer Science, Guangxi University for Nationalities, Nanning, China moyuanbing@263.net, Keywords: Multi-objective design, Particle swarm optimization, Cylinder helical Hgear Abstract.
The parameters of the cylindrical gear paradigm are as follows: Torque: ; Gear ratio: ; Material of small gear: ; Hardness: ; Material of big gear: ; Hardness: ; ; ; ; ; ; ; ; ; ; ; ; ; .
The work is supported by the Natural Science Foundation of Guangxi University for Nationalities under the Grant No. 200702YJ14.
Journal of shanghai jitong university, 2003, 37(8):1193-1197 [4] J D Schaffer.

Journal Citation (to be inserted by the publisher) Copyright by Trans Tech Publications Positron beam study of defects induced in Ar-implanted Si T.
Akahane3 1 Department of Advanced Materials Science, The University of Tokyo 5-1-5 Kashiwanoha, Kashiwa 277-8561 Japan, fujinami@k.u-tokyo.ac.jp 2 AIST, 1-1-1 Umezono,Tsukuba 305-8568, Japan 3 NIMS, 1-1 Namiki, Tsukuba 305-0044, Japan Keywords: Ar, Si, Ion implantation, Coincidence Doppler broadening, V-Ar complexes Abstract.
The positron lifetime spectra for the samples were taken using the pulsed positron beam at the National Institute of Advanced Industrial Science and Technology (AIST) in Tsukuba, Japan [6].

Li1,e 1 Department of Mechanical Engineering, Baoji University of arts and science, Baoji 710016, China 2 China Aviation Group I Qing AN Group Company Institute 106, Xi’an, 710077, China agguo2006@126.com, bhanyuqiang62@163.com, cq_cao_2001@21cn.com， dcdnkwhb@163.com, elfz1010@sohu.com Keywords: Aided design, entity modeling, finite element analysis, hybird bearing, contact Abstract.
The material of inner and outer ring is GCr15.
The material of rolling elements is ceramic, with modulus of elasticity, E 3.2×105 MPa and Poisson's ratio, m1 0.26.
Acknowledgements This research is supported by scientific research plan project of the science and technique station of Baoji, China References [1] D.S.
Chinese Journal of Mechanical Engineering, No. 3(1984) , p.26-30

Next, this paper will combine relevant survey materials, literature, industry research reports, statistics data, policies and regulations, and use qualitative methods to identify and analyze the SWOT factors that affect the sustainable development of the wind power industry in China.
In the same year, The Eleventh Five-Year Plan for National Economic and Social Development of the People’s Republic of China and National Guideline on Medium and Long-Term Plan for Science and Technology Development (2006-2020) both put forward that “strive to develop wind energy“ and “low-cost and large-scale development and utilization of renewable energy”.
Li: Geo-Information Science, Vol. 10(2008), p. 551~556 [4] C.M.
Chen, etc: Journal of Mechanical & Electrical Engineering, Vol.27 (2010), p. 1~3,14 [6] G.H.