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Safety Science. 48(10) (2010) 1361 – 1368
Yeo, K.G Neo, Inclusion of environmental performance for decision making of welding processes, Journal of Materials Processing Technology. 82(1-3) (1998) 78–88
Rodriguez, Using penalty functions to evaluate aggregation models for environmental indices, Journal of Environmental Management. 91 (2010) 706-716
Leman, Sub-index derivation of Welding Health-Hazard Index (WHI) for Small and Medium Enterprises (SMEs) in Malaysia: accepted for publishing Applied Mechanics and Materials Journal (2012)
Ott, (Ed.), Environmental Indices Theory and Practise, Ann Arbor Science Publisher Inc., Michigan, 1978

Materials and Methods Wood samples of 10 year-old Acacia mangium plantation trees were obtained from two compartments with different sit indices located in Sabah, Malaysia.
Fratzl, Wood Science and Technology, (1998).
Walker, Forest Product Journal (1994), Vol. 44 (5), p. 43-48
Shahidan Radiman, Journal Fizik Malaysia, (2008).
Forest Product Journal, (1967).

The requirements for structures vibration control can be divided into two categories, one is control the structure’s maxim displacement based on the available space and permitted maxim displacement, the other is control the structure’s maxim acceleration based on the serviceability of the structures and the strength of the materials.
Acknowledgement The work was supported by the National Science Foundation of China (51179026).
Journal of Guangxi University, Natural Science Edition, 34(5)：595-598
Journal of the Structural Division. (5): 1059-1075
Journal of Building Structures, 31(2)：55-60.

References [1] L.H Han, in: Concrete Filled Steel Tube Structure, edited by Science Press Publishing, BeiJing (2004).
In Chinese [2] L.G Jia, Li Zhang, Na Li: Journal of Shenyang Jianzhu University.
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Introduction Conjugated polymers are a class of materials with unique properties.
Acknowledgement The authors would like to thank members of the Faculty of Applied Sciences, UiTM Shah Alam for their guidance and advices in completing this project.
Schwartz, Conjugated polymer aggregates in solution: Control of interchain interactions, The Journal of Chemical Physics 110 (1999) 4068-4078
Kim, Hybrid solar cells with ordered TiO2 nanostructures and MEH-PPV, Journal of Photochemistry and Photobiology A: Chemistry 188 (2007) 364-370
Nguyen, Blue shift in the luminescence spectra of MEH-PPV films containing ZnO nanoparticles, Journal of Luminescence 128 (2008) 2031-2034

Effect of Trace Cerium on Microstructures and Mechanical Properties of 690Mega Pascal Steel Ruifeng Dong1,a, Ze-tian Liu2 and Jun Gao2 1School of Materials and Science & Engineering，Inner Mongolia University of Technology, Hohhot ,010051,China 2Compact Strip Production Plant, Baotou Iron & Steel (Group) Co.
Materials and methods Materials.
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Relevant investigate data enunciation, because of structure material failing to result in of majior accident, caused by the flaw leaking to check above 80%.In the last years, though the nondestructive test technique had a very big development, but the results still existence bigger difference when dissimilarity examination personnel carry on examination to same crack, and can't examine out the flaw bigger than provision size in structure material.
（3） In the formula as hurtfactor， as material factor， as load factor， as environment factor.
Journal of NDT,2005,27(2):57～61(In Chinese) [2] Hu HuiMin, Ma XueRong.
Journal of Mechanical Strength,2004,26(5):506～509(In Chinese) [3] Hu HuiMin, Qian RuoLi.
Journal of Aerospace Power,1994,9(3):227～232(In Chinese) [4] Gao Qing.Engineering fracture mechanics, Chongqing: Chongqing University Press,1986(In Chinese) [5] Huo LiXing.

Joint Characteristics of Spot Friction Stir Welded 5052 Al Alloy Sheet Chang-Yong Lee1,a, Won-Bae Lee 2,b, Yun-Mo Yeon 3,c, Keun Song 3,d, Jeong-Hoon Moon3,e, Jung-Gu Kim 1,f, Seung-Boo Jung1,g* 1School of Advanced Materials Science and Engineering, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, Gyounggi-do, 440-746, South Korea 2 Joining Research Group, Technical Research Laboratories, POSCO, Geodong-dong, Nam-gu, Pohang, 790-895, South Korea 3 Suwon Science College, Hwasung, Gyounggi-do, 445-742, Korea a lcy011@skku.edu, b saba38@skku.edu, c ymyeon@ssc.ac.kr, dksong@ssc.ac.kr, e jhmoon@ssc.ac.kr, fkimjg@skku.ac.kr, gsbjung@skku.ac.kr *Corresponding author Keywords: Spot Friction Stir Welding, 5052 Al alloy, Microstructure, Mechanical properties Abstract.
Then, heated and softened material adjacent to the tool deforms plastically, and a solid state bond is made between upper and lower sheets.[3-5] The melting of the material does not occurred in the spot friction stir weld zone similar to friction stir welding(FSW), therefore SFSW has many advantages such as superior mechanical properties, no shielding gas or filler wire, etc., specially, SFSW has low energy consumption compared to electrical resistance welding.
Kato : Welding Technology Vol. 52 (2004) p. 99-103 [6] Y.M.Yeon, C.Y.Lee, W.B.Lee, S.B.Jung, W.S.Chang : Journal of KWS, Vol. 23 (2005) p. 228-232 [7] H.J.Cho, H.J.Kim, J.S.No, W.S.Chang, G.S.Bang : Proceedings of the 2005 Spring Annual Meeting of KWS Vo. 44 (2005) p. 177-179 [8] M.Fujimoto, M.Inuzuka, M.Nishio, Y.Nakashima : Proceedings of the 2004 Spring Annual Meeting of JWS Vol. 74 (2004) p. 6-7 [9] Y.S.Sato, S.H.C.
Kokawa : Metallurgical and Materials Transaction A Vo. 32A (2001) P. 3033-3042
Chang, C.C.Shur, S.B.Jung : Journal of KWS Vol. 22 (2004) p. 265-272

The raw materials included the commercially pure Al (Fe: 0.04 wt. %; Si: 0.03 wt. %) and three master alloys (Al-6Er, Al-4Zr, Al-4Hf (wt. %)).
Wang, Study on the erbium strengthened aluminum alloy, Materials Science Forum. 546/549 (2007) 623-628
Huang, Precipitation evolution in Al-Er-Zr alloys during aging at elevated temperature, Journal of Alloys and Compounds. 574 (2013) 92-97
Wu, A study of precipitation strengthening and recrystallization behavior in dilute Al-Er-Hf-Zr alloys, Materials Science and Engineering A. 639 (2015) 307-313
Forbord, Precipitation kinetic of Al3(Sc,Zr) dispersoids in aluminium, Journal of Alloys and Compounds. 470 (2009) 107-110

Acta Material, 2008, 56(9): 1909–1918
Materials Science and Engineering, 2010,527(20): 531 [4] Schneider W, Kesrns MA, Mcgarry MJ.
Journal of Alloys and composites, 2011, 509: 57 [8] Nayak SS, Pabi SK, Murty BS.
Journal of Materials Science, 2004, 39(8): 2861 [10] Lee HM, Lee J, Lee ZH.
The Chinese Journal of Nonferrous Metals, 2004, 14(2): 250