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Material less than 2kg (1% of the total input materials) were omitted in this study.
The main reason was that the process of Sc2O3 production had more complicated separation and purification processes and higher materials and energy consumption.
Materials Today: Proceedings. 532 (2018) 9440-9446
Adibi, Introducing a multi-criteria indicator to better evaluate impacts of rare earth materials production and consumption in life cycle assessment, JOURNAL OF RARE EARTHS. 32 (2014) 288-295
Journal of Green Science and Technology. 03 (2012) 1674-9944

COMPARISON OF FRICTION STIR AND TUNGSTEN INERT GAS WELDMENTS OF AA6061-T6 Mohd Rafiza Shaari1, Zuhailawati Hussain1*, Indra Putra Almanar2, Nguyen Van Thuong1,3, , 1School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia 2Faculty of Mechanical Engineering Universiti Teknologi MARA 13500 Permatang Pauh, Penang, Malaysia 3School of Materials Science and Engineering, Hanoi University of Science and Technology, No. 1 Dai Co Viet street, Ha Noi, Viet Nam *zuhaila@eng.usm.my Keywords: Friction stir welding, tungsten inert gas welding, aluminum alloy, hardness Abstract In this research, 6061-T6 aluminum alloys were welded using friction stir welding and tungsten inert as techniques in order to investigate the microstructure and mechanical properties.
Friction stir welding and processing, A Review Journal, page 1-27
Materials Science Engineering: A 498(1-2): 308-313
Comparative study of friction stir welding and tungsten inert gas welding process, Indian Journal of Science and Technology, Vol. 3, June 2010
International Journal of Engineering Research & Technology (IJERT) Vol. 1 Issue 10, December- 2012.

The Cp1 of electrode materials was calculated according to literature[8].
The P of symmetric supercapacitors with low composite ratios is high because much REG exists in the materials.
Generally, the high-frequency region represents the sum of the internal resistance of the materials, electrolyte resistance, and contact resistance between the working electrode and the current collector.
[2] WEI Sun, CHEN Xu-yuan: Journal of Power Sources Vol.193(2009), p. 924-929
[9] Chung DDL: Journal of Materials Science Vol.37(2002), p.1475-1489

In conventional machining of Ti6Al4V materials, it is recommended to use a low cutting speed and high feed rate along with a generous amount of cutting fluid and high performance tools.
These include the material type, the depth of cut, cutting velocity, tool geometry and the position of the nozzle outlet.
Collings, Materials Properties Handbook: Titanium Alloys. 1994, Materials Park, Ohio: American Society for Metals
Wang, Titanium alloys and their machinability a review, Journal of Material Processing Technology, 68 (1997) 262-274
Pashby, Tool performance and chip control when machining Ti-6Al-4V and Inconel 901 using high pressure coolant supply, Machining Science and Technology, 2 (1998) 1-12

Domistic resource, purchased energy, materials input and outputs in environment and human society were identified.
In general, most of the import emergy consists of resources and raw materials; the amount of finished industrial products is limited.
This implies China imports raw materials, creates finished products, and then exports finished industrial products.
Export materials consist of agricultural and industrial finished products.
Two village Ecosystems in the Upper Minjiang River, China: A comparison of Emergy flow[J], Wuhan University Journal natural science,8(3B):935-939 9.

Xi’ an University of Science and Technology, Xi’ an 710054, Shaanxi, China 2.
Constitutive relation of materials The Von-Mises constitutive model in MIDAS/FEA was adopted for steel material, and the material plastic deformation abided by the Von-Mises yield criterion and related flow rules.
Journal of Chang’an University: Natural Science, 2008, 28(5): 48-52.
Journal of Building Structures, 2006, 28(3): 31-36.
Beijing: science press,2004.

Materials and methods 2.1 Materials Phragmites communis, Arundo donax, Typha oriental and Canna generalis are selected as the research objects in the experiment. 2.2 Experimental method The experiment is made through three repeated randomized block field experimental designs, by adopting the surface flow wetland wastewater treatment method (See: Table 2) and without plants as a control.
Journal of Agro-environmental Science, 4 (2003) 454-457
Materials Transactions, 2(2003) 305-312
Journal of Lake Science, 2 (2002) 179-184
Journal of Lake Sciences, 6 (2008) 741-747.

The results reveal the process in which the materials crack, expand and break under the impact loading [2].
The material models in LS-DYNA describe the changes in the relationship between the strength, the pressure and the damage of the material [4].
Before they reach the fracture strength, the glass material can be taken as elastic material as well as intact material, whose strength changes with cumulative damage [5].The strength of the glass material includes two kinds, the strength of the intact material and the strength of the crushed material.
References [1] Zuo Yujun, Tang Chun’an and Gong Fengqiang :Journal of Jishou University(Natural Science Edition) Vol.27(6) (2006), p.80 [2] Yang Yunchuan and Dong Jianghai :Journal of Wuhan University of Technology Vol.29(10) (2007), p. 73 [3] Kang Jie and Yang Yunchuan : China Powder Science And Technology Vol. 16(2) (2010),p.68 [4] Wu Kegang, in: Experiment and Numerical Simulation of Anti-penetration Effect to Long-rod Projectiles of Steel Fiber Reinforced Concrete Targets within The A97-ceramic–plate or The Armor Plate, M.S.
Holmquist and Dr.G.R.Johnson,in: 14th International Symposium on Ballistics (1995),p. 591 [6] Guo Yanshuang, in: The Study on Experiment, Theory and Numerical Simulation of Fracture of Three-dimensional Flaws in Brittle Materials, M.S.

The material of rough surface is low-carbon steel Q245, and its material attribute is given in Table 1.
E2012203097), the National Natural Science Foundation of China (NSFC, Grant NO. 50675050) and National science and technology major projects of "high-end CNC machine tools and basic manufacturing equipment"( Grant NO. 2011ZX04002-111).
Hertz: Journal für die reine und angewandte Mathematik.
McCool: Journal of Tribology, Vol. 122 (2000) No.3, pp. 496
Etsion: Journal of Tribology, Vol.121 (1999) No.2, pp. 234

Xu: Materials Science and Engineering, Vol.
Zhu: Materials Science and Engineering, Vol.
Cong: Materials Science and Engineering, Vol.
Zhou: Journal of Materials Research, Vol. 14 (1999), p. 68 [10] H.C.
Chandrashekar: Bulletin of Materials Science, Vol. 24 (2001) No. 4, p. 345 [14] O.