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Graphene is a material with a very high intrinsic strength.
High surface hardness materials are necessary in many applications such as cam or ring gears, bearings or shafts, turbine applications, and automotive components [2].
The surface hardness was measured using a Micro Materials nanoindentation tester under load control to 200 mN.
Howe, Characterization of Phases Formed in the Iron Carbide Process by X-Ray Diffraction, Mossbauer, X-Ray Photoelectron Spectroscopy, and Raman Spectroscopy Analyses, Metallurgical and materials transactions B, 32B (2001) 7
Holm, Elimination of oxide films on ferrous materials by heating in vacuum, Part of Journal of Research of the National Bureau of Standards, 28 (1942) 11.

CInstitute of clinical medical science, China-Japan friendship hospital, Beijing 100029, China.
Corresponding author: Xiaowen Wang; Email: wxw3001@126.com; Address: Rm B117, Medical School Building Tsinghua University, Haidian district, Beijing; Fax: 86-10-62796784; Telephone Number: 86-10-62796784 Keywords: Polymethylmethacrylate; Nanoparticles; Ferroelectrics; Magnetic materials; Abstract.
SM, Buggy, M, Bone cements and fillers: A review, Journal of Materials Science-Materials in Medicine. (11)2003:923-938. ].
Materials and Methods Synthesis of Fe3O4 particles.
PMMA powders and Methacrylate (MMA) monomer were supplied by Tianjin institute of synthesis materials industry, China, and the average particle size of the PMMA was measured by a scanning electron microscope (SEM: FEI, QUANTA 200, Brookhaven Instrument Corporation.

The main reason is that the mechanical properties of these materials are comparable with those of glass fiber reinforced composites.
In case of opaque polymer matrix materials the acoustic emission can complete the investigation of the debonding mechanism [11,12].
Experimental Materials.
Number of AE events in different kinds of materials In comparison to the matrix material it can be assessed that the presence of fiber reinforcement generates lots of acoustic events.
Journal of Composite Materials 38 (2004) 769-778 [16] Romhány G., Karger-Kocsis J., Czigány T.: Tensile fracture and failure behavior of thermoplastic starch with unidirectional and cross-ply flax fiber reinforcements Macromolecular Materials Engineering 288 (2003) 699-707

Materials and Methods We chose minjiang river (Wenchuan water source), jiangyou station and beichuan station to investigate the water quality, and select ammonia nitrogen, total hardness, fluoride,total iron, these four indicators to analyze the change trend of the water quality before and after the earthquake.
Research of Environmental Sciences,2008,21(5):110-116.
Influence of Wenchuan Earthquake on Water Resources and Water Environment in the Upper Reaches of the Minjiang River [J].Journal of Sichuan Normal University (Nature Science), 2009:01:0134
[8] ZHAO Qin,LUO Mao-sheng,CAO Shu-you,et al.Research on the recovering measures and economic loss evaluation of soil erosion and water loss in Wenchuan-Earthquake-hit are-as of Sichuan Province[J].Journal of Sichuan university(Engineering Science Edition), 2009, 41(3): 289—293.
Chinese Journal of Disinfection 2008:25(6).

Materials and methods Plant materials The dried samples of Amomum villosum (Spring No.1) were collected in 2008 from the nursery of Amomum villosum testing field, Yangchun City (Guangdong, China).
The identification of the plant materials was confirmed by Prof.
Wei: Chinese Pharmaceutical Journal Vol. 36 (2001), p. 235 [6] X.
Xiao: Journal of Chinese Medicinal Materials Vol. 27 (2004), p. 438-439 [7] C.
Guan: Chinese Science Bulletin Vol. 49 (2004), p. 2372-2374 [8] Z.

Journal of Materials Research and Technology, 17, 3361-3370
Case Studies in Construction Materials (2022): e01109
Materials 14.15 (2021): 4222
Environmental Science and Pollution Research, 28(46), 65935-65944
Applied Sciences 10.20 (2020): 7330.

Materials and Methods.
This might be due to the week bond between waste glass powder and white cement as waste glass powder has a smooth and flat surface resulted in week anchor between both two materials.
Nummesri: Utilization of solid waste by transforming into raw materials in ceramic works: report submitted to Chiang Mai Rajabhat University (2008) [12] A.
Al-Tabbakh: Recycling Glass Powder and its use as Cement Mortar applications: International Journal of Science and Engineering Research Vol. 7 (2016), p. 555-564 [13] A.
Aboshama: Utilization of waste glass powder in the production of cement and concrete: Construction and Building Materials Vol. 124 (2016), p. 866-877 [14] W.P.

The use of advanced materials for remanufacturing increases the life extension efficiency.
The properties of the constituent materials of the weldment at 640 oC are taken from the previous literature[9, 10].
The results may give us several hints: (1) For cylinders of different materials the surface coating or repair should be applied in different surfaces; (2) For the materials controlled by the maximal principal stress, the inspections by replica, MT and so on could be done on the outer surface.
Willams: Materials at High Temperatures Vol. 16 (1999), p. 107 [11] S.
Tu: High Temperature Structural Integrity, Beijing: Science Publisher, (2003)(in Chinese)

Ren, Material removal mechanisms of cemented carbides machined by ultrasonic vibration assisted EDM in gas medium, journal of materials processing technology 209, 1742–1746, (2009) [6] M.
Machining and Machinability of Materials, Vol. 19, No. 1, (2017)
Puertas, Grain Refinement Of Pure Copper By Ecap, Materials Science Forum Vols. 584-586 , Pp 393-398, (2008)
Fundamentals of superior sproperties in bulk nanoSPD materials.
Materials Research Letters. 2015:1-21.

Reactive powder concrete (RPC) can be produced from ordinary materials (cement, very fine aggregate "0.15-0.6" mm, low water-cement ratio), in addition to other materials (Silica Fume, Superplasticiser, steel fibers) [2, 7].
Material Properties The materials in present study are reactive powder concrete and smeared reinforcement which is represented by steel fibers.
The reactive powder concret is produced from ordinary materials (cement, very fine aggregate, low water-cement ratio) , as well as to additional materials (Silica Fume, Superplasticiser) to be the maximum particle size of materials is 0.6 mm.
Qasim, Behavior of reinforced reactive powder concrete two-way slabs with openings, Journal of IOP Conference Series: Materials Science and Engineering, 518 (2019)
Mustapha, Low velocity and high velocity impact test on composite materials, The International Journal of Engineering and Science (IJES). 3(9) (2014) 50-60