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This is because these materials are abundant in nature, can serve as a raw material source at a reasonable price, and also exhibit high mineral purity naturally.
Materials and Methods Preparation of Cockle Shell as Calcium Precursor.
Cree, Progress of bio-calcium carbonate waste eggshell and seashell fillers in polymer composites: a review, Journal of Composites Science, 4(2) (2020) p.70
Li, Synthesis and characterization of calcium hydroxide nanoparticles by hydrogen plasma-metal reaction method, Materials Letters, 64(23) (2010) pp.2575-2577
Sri, Synthesis of hydroxyapatite nanoparticles from egg shells by sol-gel method, Conference Series: Materials Science and Engineering 345(1) (2018) p. 012040

Comparing to macro mechanical machining process, micro mechanical machining such as micro milling can create complicated micro structures on various materials using miniature tools with high material removal rates.
Acknowledgement This project is supported by the National Natural Science Foundation of China and Jiangsu Natural Science Foundation and the Innovation Foundation of Nanjing University of Aeronautics and Astronautics.
[2] S.Gordon,M.T.Hillery:Journal of Materials Processing Technology,Vol.166(2005), pp.321-329
[5] M.Rahman, A.Senthil Kumar and J.R.S.Prakash: Journal of Materials Processing Technology, Vol.116(2001), pp.39-43
Kapoor: Journal of Manufacturing Science and Engineering, Vol. 126 (2004), pp. 695-705

Remarkable is the nearly equal Oi concentration after the process for the two materials.
Takenaka: Materials Science Forum, 196(201) (1995), p.1865 [3] H.
Yasuda: VLSI Science and Technology, ed.
Lin: Journal of Crystal Growth, 89 (1988), p.117 [7] Qi-Yuan Wang, Zhen-Yu Ma, Tian-Hai Cai, Yuan-Huan Yu, Lan-Ying Lin: Semiconductor Science Technology Vol. 14 (1999), p.74 [8] H.
Roberts: Journal of Applied Physics Vol. 84 (1998), p. 2476

Materials and Methods Materials.
Moisture and ash contents are determined according to the American Society for Testing and Materials methods (ASTM-D2974-87) and AOAC Official Method 923.03, respectively.
Journal of pharmaceutical sciences Vol. 100 (2011), pp. 3260-3267 [8] A.B.
Sittikijyothin: Advanced Materials Research Vol. 239-242 (2011), pp. 477-480 [10] P.
Rhim: Journal of Food Science Vol. 67 (2002), pp. 194-197

Progress in Materials Science, 50 (2005): 511-678
Materials Letters, 57 (2002): 452-456
Materials Science and Engineering.A, (2006): 666–670
Journal of Engineering Materials & Technology, 55 (2010): 257-315
Materials Science & Technology, 30 (2014): 1530-1544

Introduction With the improvement of the fabrication process and the level technology of the high temperature superconducting (HTS) materials, HTS electrical equipment which is especially the research of HTS generator has opened up a new way for the safe and economic operation of the power system.
The selection of HTS material.
Currently, the main HTS materials for mature application are Bi-2223 and YBCO, especially YBCO bulk which has many advantages such as higher critical temperature, high critical current, high remanence, more mature process and more reasonable price [4].
:Development and Applications of High Temperature Superconducting Material, Journal of University of Electronic Science and Technology of China,2006,35(14):612-627 [5] Ma Yanwei, Xiao Liye.
:Development and Application of the 2 Generation HTS Coating Conductor YBCO, Chinese Science Bullentin. 2005,50(1),1-5 [6] S.

The researches on nano/micro-structured material, including inorganic materials [1-10], organic materials [11-17] and organic-inorganic hybrid materials [18-28], reveals that inorganic nano/micro-structured materials are promising for near future applications due to their excellent properties and preparation simple.
Y2008F24), Science Fundation of State Key Lab of Silicon Materials (project No.
Sberveglieri: Progress in Materials Science, Vol.54(2009), p. 1 [8] X.
Fan: Materials Science and Engineering, Vol.R52(2006), p.49 [11] J.
Zaki: Journal of Colloid and Interface Science, Vol.308(2007), p. 385 [27] E.

The glass fiber reinforced thermosetting composite material with high specific strength has become the main current blade manufacturing materials.
Wind turbine blade materials require high fatigue life, impact resistance, and can withstand the harsh environment field.
Journal of Solar Energy Engineering, 2005,127: 570-580 [5] First recyclable wind blade to be developed.
Proceedings of the 27th Risø International Symposium on Materials Science: Polymer Composite Materials for Wind Power Turbines.
Journal of Beijing University of Aeronautics and Astronautics, 2012,3

The friction heat caused at the grain-workpiece interface has attracted a lot of research in the field of grinding hard and brittle materials[2,3].
This might be attributed to the different material removal mechanisms for the two kinds of materials.
In grinding of brittle materials, material removal mechanisms are classified as brittle fracture (brittle mode grinding) and/or plastic flow (ductile mode grinding)[15].
Xu: Key Engineering Materials Vol. 416 (2009), pp 198-204
Malkin: ASME Journal of Manufacturing Science & Engineering Vol. 123 (2001) No.1, pp: 13-22

Application of a Ternary Zn-based Solder Alloy for Joining of AZ31B Magnesium Alloy with Ultrasonic Support Miroslav Jáňa1, a, Milan Turňa2, b, Milan Marônek3, c, Marcel Kuruc4, d, Pavel Bílek5, e 1, 2, 3, 4Slovak University of Technology in Bratislava, Faculty of Materials Science and Technology in Trnava, Institute of Production Technologies, Paulínska 16, 917 24 Trnava, Slovak Republic. 5Slovak University of Technology in Bratislava, Faculty of Materials Science and Technology in Trnava, Institute of Material Science, Paulínska 16, 917 24 Trnava, Slovak Republic.
In: Journal of Materials Engineering and Performance, Vol. 20, pp. 219-222 [11] MA, L., QIAO, P., LONG, W., HE, D., LI, X., 2012.
In: Journal of Materials Engineering and Performance, Vol. 22, pp. 118-122 [13] CZERWINSKI, F., 2011.
Journal of Materials Science, Vol. 42 Issue 10, p. 3552  [16] SATO, Y.
Journal of Materials Science, Vol. 40 Issue 3, p. 637  [17] SPIGARELLI, S., EVANGELISTA, E., El MEHTEDI, M., BALLONI, L., 2007.