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Core materials of medium opacity (MO) and high opacity (HO) are designed for discolored teeth.
Materials and Methods Preparation of specimens.
The relative translucency of core materials should be taken into consideration for choice of all ceramic materials.
Acknowledgements This work was supported by National Natural Science Foundation (50973045) and Natural Science Foundation of Guangdong Province (9151051501000072).
Wen, et al.: Chinese Journal of Prosthodontics.

Sixthly, we should encourage cooperation among raw materials suppliers, manufacturers, recyclers and processors, so that processed materials and components can be used reasonably.
Second, it can encourage manufacturers to use recoverable materials in electronic products, at the same time, strictly prohibit using poisonous or harmful materials.
For the manufacturers and raw materials suppliers, it can reduce their manufacturing cost and improve economic benefit.
Hultman, in: Journal of Organizational Change Management, Vol. 25(2012), p. 297 - 314 [2]L.
Revene, in: International Journal of Management Science, Vol. 35 (2007), p. 553-562 [6]H.

Kaczmar1,b and Jerzy Morgiel2,c 1Wrocław University of Technology, Łukasiewicza 3/5, 50-371 Wrocław, Poland 2Institute of Metallurgy and Materials Science, Polish Academy of Sciences, Reymonta 25, 30-059 Kraków, Poland akrzysztof.naplocha@pwr.edu.pl, bjacek.kaczmar@pwr.edu.pl, cnmmorgie@imim-pan.krakow.pl Keywords: ceramic preforms, aluminum alloys, squeeze casting, composite materials Abstract.
MgAl2O4 spinel b) a) Fig. 2 Composite materials based on EN AC-44200 Al alloy, (a) ultimate tensile strength of unreinforced aluminum alloy (0%) and of composite materials reinforced with 10 and 20 vol.% of Saffil fibers at 20-300oC, (b) Fracture of composite materials with cracked fibers partly covered by MgAl2O4 spinels –scale bar 5 mm Normally composite materials applied in the production of car engine parts are subjected to several thermal cycles.
Thus, coefficients for composite materials at higher temperatures of 300-400 oC were significantly smaller and decreases from 22 to 13x1/106 deg correspondingly for unreinforced Al alloy and composite materials with 20% of fibers.
Formanek, Structure and properties of aluminum cast composites strengthened by dispersion phases, Journal of Materials Processing Technology 175/1-3 (2006) 192-197
Pietrzak, W Włosiński, The production and application of metal matrix composite materials, Journal of Materials Processing Technology 106/1-3 (2000) 58-67

Experimental Methodology Materials.
In this work, the rigid material (PLA-based material) is first printed, followed by the soft materials (TPU-based material).
Yeong, "Process–structure–properties in polymer additive manufacturing via material extrusion: A review," Critical Reviews in Solid State and Materials Sciences, vol. 45, no. 2, pp. 113-133, 2020
Ferreira da Silva, "Interface geometries in 3D multi-material prints by fused filament fabrication," Rapid Prototyping Journal, vol. 25, no. 1, pp. 38-46, 2019
Vietor, "Determination of influencing factors on interface strength of additively manufactured multi-material parts by material extrusion," Applied Sciences, vol. 9, no. 9, p. 1782, 2019

Durable Carbon for Structure Applications, H2-Energy Carbon Building Materials (HECBM) Wen-Cheng J.
One method reported [7] utilizing catalytic decomposition with carbonate catalytic materials.
Low-graded coals (lignite, or peat) can be used as raw materials.
Halloran, International Journal of Hydrogen Energy 33, 2218‐2224 (2008) [6] T.
Polymer Science 83, 660-686

Analysis and Simulation of Sensor Structure Parameters and Filling Materials Characteristics for Electrical Capacitance Tomography System Deyun Chen1, a, Lili Wang1,b and Yu Chen1,c 1 Harbin University of Science and Technology, China a chendeyun@hrbust.edu.cn, bwanglili@hrbust.edu.cn, clg_chenyu@yahoo.com.cn Keywords: Electrical Capacitance Tomography, Finite Element Method, Filling Materials Characteristic, Parameter Optimizing, Computer Simulation Abstract.
In conclusion, the final parameters and materials adopted are proved better than those adopted before.
And it is better than any other insulated materials in dielectric loss, voltage withstand, volume resistivity and surface resistivity.
And in this way, the effect on EC that is caused by changes of dielectric constant of outside materials can be prevented.
Chinese Journal of scientific instrument.

Journal of Materials Processing Technology 58(1996) 109 – 113 [2] J.P.
Journal of Composite Materials, 45(24), 2579-2586, 2011
Indian Journal of Science and Technology.
Journal of Composite Materials, 46(18), 2227-2237, 2011
Journal of Composite Materials, 46(26), 3321-3324, 2012

Reflections on Technology Transfer Between University’s Schools of Engineering and Sciences and Industry in Nigeria A.I.
▪Lack of utilization of local raw materials and inappropriate government policies have resulted in making Nigerian industries to be import dependent.
On the contrary, the driving force for academics is towards publishing basic research findings in journals which is necessary for their academic career.
▪Multinational companies should be encouraged to establish research and development facilities locally and source for local raw materials for their production process.
Implications for organization Science, Vol.1, pp. 47-81

Guan: Journal of Alloys & Compounds, Vol. 709 (2017), p. 735
Jian: Journal of Magnetism and Magnetic Materials.
[4] Zhou, Y., Xie, H., Zhou, W., and Ren, Z.: Journal of Magnetism & Magnetic Materials.
Xu: Journal of Magnetism & Magnetic Materials, Vol. 451 (2018), p. 11
Zhang: Journal of Alloys and Compounds.

When, two different materials work together gives the composite unique properties.
The mechanical properties of e-glass fiber/epoxy resin with nano materials are given in Table 1.
§ The fabricated composite material cart spring system proved the better performance than the other conventional type steel materials
Nallusamy and Saurabh Kumar, (2016), “Efficiency and lifespan enhancement of product with dissimilar material using different techniques”, Indian Journal of Science and Technology, Vol. 9(16), pp. 1-5 [35] S.
Journal of Mech. and Material Sciences Research, Vol. 4(1), pp. 01-08 [39] S.