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With the devices miniaturization, the properties of materials at the micro/nano scale were much different from what at Macro-scale because of the scale effect.
The properties of materials at the micro/nano scale were much different from what at macro-scale because of the scale effect, when the thickness of the material was small to nanometers, and it was very difficult to measure the thermophysical properties of material by using experiment method [1].
[5] Ping Yang, and Ningbo Liao: Applied Physics A, materials science & processing, vol.92(2008), p. 329-335
[7] Hua-wei Yin, Wei-jian Yi, and Yan Liu: Journal of Hunan University of Science & Technology(Natural Science Edition), vol. 21(2006), p. 41-46
[8] Qing Zhang, Zi-bin Zhou, and Jia-shou Zhuo: Chinese Journal of Computational Mechanics, vol. 11(2005), p. 8–11

Xu, Casting of SiC Reinforced Metal Matrix Composites, Journal of Materials Processing and Technology, 63 (1997) 358-363
Mark, Hot Cracking in Tungsten Inert Gas Welding of Magnesium Alloy AZ91D, Materials Science and Technology, 23 (2007) 1294-1299
Zhou, Calorimetric Analysis of AZ91D Magnesium Alloy, Materials Letters, 62 (2008) 4494-4496
Li, Solidification Microstructure of AZ91D Mg Alloy after Laser Surface Melting, Applied Physics A: Materials Science & Processing, 101 (2010) 339-344
Zhou, Tensile and Fatigue Behaviour of AZ91D Magnesium Alloy, Journal of Materials Science Letters, 21 (2001) 457-459.

In general, PCMs are environment-friendly, and considered as non-hazardous energy storing materials.
Ramadan, Material Based Fault Detection Methods for PV Systems, Key Engineering Materials. 856 (2020) 111-115. [14] T.
Zhao, Photovoltaic panel integrated with phase change materials (PV-PCM): technology overview and materials selection, Renewable and Sustainable Energy Reviews. 116 (2019) Article ID: 109406. [15] K.
Wongwuttanasatian, Reducing PV module temperature with radiation based PV module incorporating composite phase change material, Journal of Energy Storage. 29 (2020) Article ID: 101346. [17] M.F.
Hassan, Impact of graphene nanofluid and phase change material on hybrid photovoltaic thermal system: Exergy analysis, Journal of Cleaner Production. 277 (2020) Article ID: 123370. [20] M.

Efforts are made to improve the efficiency and searches for cheaper materials are in progress [1].
Bulk samples of materials have constant optical band gap energies but for thin films band gap could be varied with grain size.
Aida, Journal of King Saud University-Science(2015) 27, 356-360
Barote, Journal of Chemical Biological and Physical Sciences 3 (2013) 525-533
[19] Min Su Kim,Soaram Kim,Giwoong Nam,Dong-Yul Lee, Jac-Young Leem, Optical materials 34 (2012),1543-1548

Jawaid: Journal of Materials Processing Technology, Vol. 166 (2005) No. 2, pp. 188–192
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Nieslony: Journal of Materials Processing Technology, Vol.164-165 (2005), pp. 1204-1211

To be specific, such materials as wet lightweight aggregate, sand, cement and fiber are put into a mixer and mixed for 2 to 3 minutes.
Materials Applications. 2005.06.（50-54） [5] Zhang Huili.
Journal of Jiaozuo Institute of Technology (Natural Science).2003.01.(15-20) [7] Sun Yanqiu.
Study on Performance of PVA-Fiber-Reinforced Cement-based Composite Materials[D].Chongqing: Chongqing University,2005
Journal of Shenyang Jianzhu University (Natural Science).2007.01.(77-81) [10] Zielinski, Krzysztof, Olszewski, Prcemyslaw.

Improved Fracture Strength of 5YSZ/Al2O3 Composite Matrix by Addition of SiO2 for Planar Automotive Oxygen Sensor Lei Wu1,a, Ben Ma2,b*, Jian Pu1,c, Bo Chi1,d, Jian Li1,e 1Center for Fuel Cell Innovation, School of Materials Science and Engineering, Huazhong University of Science and Technology, 1037 Luo Yu Road, Wuhan, Hubei 430074, China 2College of Science, Wuhan University of Science and Technology, 947 He Ping Avenue, Wuhan, Hubei 430080, China aM201570738@hust.edu.cn, bmaben@wust.edu.cn, cpujian@hust.edu.cn, dchibo@hust.edu.cn, elijian@hust.edu.cn Keywords: 5YSZ/Al2O3; Composite ceramic; Fracture strength; Ring-on-ring method; Planar automotive oxygen sensor Abstract: As the ceramic substrate materials in automobile oxygen sensor, 5YSZ/Al2O3 matrix composite ceramic with different amount of silica are prepared by ball milling, tape casting, and sintering.
Table 1 The composite ceramic formulas [g] Sample 0S 1S 2S 5YSZ 280.5 277.5 274.5 Al2O3 19.5 19.5 19.5 SiO2 0 3 6 Total 300 300 300 The England Melvin mastersizer 3000 was used to analysis the compatibility among 5YSZ powders (Guangdong Huawang Zirconium Materials Co.
Fig.5 Element mapping of different composite ceramics Summary To improve the fracture strength of 5YSZ/Al2O3 substrate materials in automobile oxygen sensor, SiO2 was added into the matrix of 5YSZ/Al2O3 to form SiO2/5YSZ/Al2O3 ceramic composites with various SiO2 contents between 0 and 2 wt. %.
[6] Jinfeng Xia, Hongqiang Nian, Wei Liu, et al., Synthesis, Sintering Behavior, Structure, and Electrical Properties of 5YSZ Electrolyte, Journal of Materials Engineering and Performance, 2015. 24: 2191-3299
[10] American Society for Testing and Materials.Standard Test Method for Monotonic Equibiaxial Flexural Strength of Advanced Ceramics at Ambient Temperature.2009

In recent years, due to advances in science technology, space satellites have made progress.
It is because that some materials on the surface of the rotor and stator are vapored out and the frictional force increased.
Fig. 5 Lining materials.
Fig. 6 Durability of motor with lining materials.
Table 2 Rotation speed in vacuum each lining materials [rpm] Table 3 Torque in vacuum each lining materials [mNm]. 　

Admixtures Cement concrete is the largest man-made contemporary engineering materials.
Application of Coal gangue In recent years, development of building materials of coal gangue is quite rapid.
(In Chinese) [3] H.B.FU: submitted to Construction Equipment and Construction Materials (2010).
(In Chinese) [12]B.JIA, R.H.ZHANG: submitted to Fujian Building Materials (2010).
Bui: submitted to Construction and Building Materials (2011) [15]P.K.Mehta: submitted to Advances in Concrete Technology.

Gadolinium (III) oxide and iron (III) oxide, αFe2O3 were used as the starting materials.
Materials and Methods Preparation of sample.
Journal of Magnetism and Magnetic Materials, 321, 2883-2889 (2009) [8] Information on https://www.liverpool.ac.uk/~mimi/Chapter3.pdf [9] Chen, Y., Sakai, T., Chen, T., Yoon, S.
Journal of Materials Science: Materials in Electronics, 20(9), 784-834 (2009) [12] Roschmann, P. and Winkler, G.
Journal of Magnetism and Magnetic Materials, 4, 105-115 (1977)