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Introduction Welded joints of various materials using different welded technologies are widely applied in industrial and agricultural engineering with the advantages of lightweight, fabricated production.
Fatigue & Fracture of Engineering Materials & Structures, 2010. 27(11): p. 1005-1024
International Journal of Fatigue, 2012. 40: p. 129-142
International Journal of Fatigue, 2005. 27(1): p. 85-100
Applied Sciences, 2020. 4(1): p. 1-16

Consider heavy metal pollution of topsoil in the city of world today is a hot science research project.
The soil is the important material base of the human survival and development, and also is the much more important part of the cycles of Urban environmental geochemistry[2,3], but the heavy metals in topsoil is an important pollution issue.
Acknowledgment The paper is financially supported by China national natural science foundation (No. 51139005 , No.51279149, No.61373041) and Discipline construction foundation of Wuhan University of Technology (No.2013-Ia-040) References [1] Karen Chen.
[4] Deng Qiujing, etc., Distribution and Evaluation of Heavy Metals in Cultivated Soil of Guiyang 2006,38 (1) : 53-60 [5] Xu Qing,Zhang Lixin, Liu Suhong, Zhang Linjin, Heavy metal pollution of topsoil and its evaluation of potential ecological risk：a case study of different functional areas in Baotou City JOURNAL OF NAtuRAL DISASTERS 2008(6),6-12 [6] Nymphodora Papassiopi，Athina Kontoyianni，Katerina Vaxevanidou．Assessment of chromium biostabilization in contaminated soils using extraction standard leaching and sequential techniques[J]．Science of Total Environment，2009. 407(2)：925-936．

Ma, Friction stir welding and processing, Materials Science & Engineering, 50 (2005) 1-78
Zaeh, Manufacturing of lightweight frame structures by innovative joining by forming processes, International Journal of Material Forming, 2(2009) 307-310
[4] LG Zhang, SD Ji, GH Luan, CL Dong, L Fu, Friction Stir Welding of Al Alloy Thin Plate by Rotational Tool without Pin, Journal of Materials Science & Technology, 27(2011) 647-652
V Kailas, The role of friction stir welding tool on material flow and weld formation, Materials Science & Engineering A, 485(2008) 367-374
[8] Carl D Sorensen, Aaron L Stahl, Experimental Measurements of Load Distributions on Friction Stir Weld Pin Tools, Process Metallurgy and Materials Processing Science, 38(2007), 451–459.

As the materials selected in this paper come from adult mandibular and dentition, the bone suture is mature, and the growth potential is small, the influence of suture doesn't need to be considered.
Material parameter.
CHINESE JOURNAL OF PROSTHODONTICS, 4(4), Dec., 2003
Development of the FEM Preprocessing and Postprocessing Assistant Software Applied to Dental Biomechanics, JOURNAL OF SICHUAN UNIVERSITY (ENGINEERING SCIENCE EDITION), 32 (5), Sep., 2000
Influence of force location in orthodontic shear bond strength testing, Dental Materials, 21(5), 2005, p.391-396

Materials and Methodology The starting material was p-type single crystalline silicon (p-SCS) wafer (<100> orientation; boron doping; 0.75~10 Ω cm-1).
Vial: Solar Energy Materials and Solar Cells Vol. 26 (1992), p. 277-283
Bucher: Solar Energy Materials and Solar Cells Vol. 26 (1992), p. 345-356
Collins: Journal of Electronic Materials Vol. 17 (1988), p. 533-541
Gosele: Advanced Materials Vol. 4 (1992), p. 114-116

On top of that, choosing the materials and determining the die fillets are other issues.
Journal of Materials Processing Technology, 2001. 109(3): p. 283-289
Journal of Materials Processing Technology, 2012. 212(4): p. 786-793
Materials & Design, 2007. 28(4): p. 1311-1320
Advanced Materials Research, 2014. 845: p. 803-808

So for smooth non-impregnable materials only ~ 0.1 kg/m2 of water is retained [19].
Materials.
Journal of Hazardous Materials. 133 (2006) 1–7
Journal of Achievements in Materials and Manufacturing Engineering. 91 (2018) 27–33
Open Journal of Safety Science and Technology. 5 (2015) 21-26

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China. 3.
REFERENCES [1] Siegert, K., Haussermann, M., Losch, B., Rieger, R., 2000, Recent developments in hydroforming technology, Journal of Materials Processing Technology, pp.251-258
Advanced Materials Research, 2013: 651-657 [5] R.
Journal of Materials Processing Technology, 2010: 1673-1679 [10] P.
Journal of Materials Engineering and Performance, 2007: 354-359

Correlation between Conversion Efficiency and Impedance Spectroscopy Parameters for Dye Sensitized Solar Cell with TiO2 Nanostructure Modification Prathan Prachopchok1,a*, Chanchana Thanachayanon2,b, and Tanakorn Osotchan1,c 1 Materials Science and Engineering Program and NANOTEC-MU Excellence Center on Intelligent Materials and System, Faculty of Science, Mahidol University, Thailand 2 National Science Technology Development Agency, Thailand aprathanscme@gmail.com, bchanchm@mtec.or.th, csctos@mahidol.ac.th Keywords: Impedance spectroscopy, dye sensitized solar cell.
Solar Energy Materials and Solar Cells, 2007. 91(15–16): p. 1416-1420
Solar Energy Materials and Solar Cells, 2003. 76(1): p. 57-64
Solar Energy Materials and Solar Cells, 2005. 87(1–4): p. 117-131
Materials Science and Engineering: B, 2002. 94(2–3): p. 136-140.

Therefore, the development of lightweight materials is extremely urgent.
Porous materials are widely used in sound absorption, heat insulation and catalysis.
Experimental Procedures Raw materials.
After mixing the raw materials, water and foams, the slurries were pouring into the mold.
Thermal conductivity of highly porous mullite materials, Int J Heat Mass Tran. 67(2013) 253-259