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The smoother surfaces, the lower friction coefficients and higher hardness make nanocrystalline diamonds better candidates as coatings materials for mechanical tools.
Acknowledgements This work is supported by Nanometer special Foundation in the field of advanced materials of National High Technology Research and Development Program (863 Program) of P.R.
Zhang, et al: Diamond and Related Materials Vol. 11 (2002), p. 228 [3] Z.
Shi, et al: Diamond and Related Materials Vol. 9 (2000), p. 1979 [4] N.
Caledge, Paul Baker, et al: Diamond and Related Materials Vol. 9 (2000), p. 1512 [7] Hironmichi Yoshikawa, Cedric Moral, et al: Diamond and Related Materials Vol. 10 (2001), p. 1588

Risks were originating from problems in the implementation of construction work, including resources including labour resources, materials, and equipment that can pose risks if not properly managed.
Husin, Mubarak, Fachrurrazi, The Significance Risk for Factors of Labour, Material, and Equipment on Construction Project Quality, Aceh International Journal of Science and Technology (2019) 8(2): 106-113
Procedia-Social and Behavioral Sciences (2014)
Series: Materials Science and Engineering (2019)
International Journal of Foresight and Innovation Policy (2016) 167-183

Most cold forging die insert materials are powder sintered tungsten steel materials, which can hardly bear the circumferential tension and stress that the die insert longitudinal fracture is easily caused.
Vazquez et al. [1,2] compared cold forging dies between tungsten steel inserting the die and separating the inserted die with the finite element software DEFORM and the effects of materials on the die service life in 2000, intending to look for the best approach to enhance the die service life.
Fig. 1 shows the 6 stages for hexagon flange nuts, including the working of die, punch, and forging workpiece and the relative positions (Fig. 2); and, the materials and characteristics are described as below (Table 1).
Altan, Tool life in cold forging–example of design improvement to increase service life, Journal of Materials Processing Technology. 98 (2000) 90-96
Shih, Wear Analysis of Forging Die for Long Hex Flange Nuts, Advances in Materials Science and Engineering.

The city ecological system includes not only biological factors (plants, animal, bacillus, epiphyte, and virus) and non-biological factors (light, heat, water, and atmosphere), but also human factor, and social and economical factor, and these factors form an interior associated whole by the energy flow, chemical circulation of biological earth, and materials supply and waste disposal system.
Journal of Guangzhou Landscape Architecture, No.4
Science & Technology Information, No.35
Journal of Kaifeng University, No.3
Zhejiang Academic Journal, No.4.

Buenfeld: Corrosion Science, 2000: 42(11): 2013-2021 [2] ACI committee 222 (1985): Journal Proceedings, 82 (1), pp.3-32 [3] RILEM technical committee 124-SRC (1994): Materials and Structures, vol.27, 415-436 [4] G.K.
Buenfeld: Corrosion Science, 1997: 39(5): 1001-1013 [5] A.
Arliguie: ACI Materials Journal 97 (4) (2000) 454–464 [6] T.
Hisada: ACI Materials Journal 96 (2) (1999) 154–159 [8] D.W.

There have been achievements using this type of method to solve plane elasticity issues with complex defects, namely, articles [1-6] which applied such method to address crack problems of elliptical holes, double-crack problems of elliptical holes, four-edge crack problems of round holes, periodic radial cracks of circular holes, star-crack problems, circular holes with k radial edge cracks, and so on; but achievements that used this method to solve complex defect problems in quasicrystal materials are still relatively scarce.
The quasicrystal is a condensed matter newly discovered in 1984.[7] As a new functional material, and structural material, the quasicrystal has extensive application aspects; its mathematical elastic mechanics as well as defect mechanics has been the research objective of many mathematicians.
(In Chinese) [10] Jiandong Pi, Guanting Liu, Huaimin Guo: Journal o f Inner Mongolia Normal University Vol. 35(2006), p. 391-396 (In Chinese) [11] Xianfang Li, Tianyou Fan: Phys.
Sinica, overseas Edition Vol. 8(1999), p. 288-295 [13] Guanting Liu, Ruiping Guo, Tianyou Fan: Chinese.Physics Vol. 2(2003), p. 1149-1155 [14] Lu Guan, Zhu Chen: Advanced Materials Research.
Vol. 219 (2013), p. 7445-7449 [20] Tianyou Fan: Mathematical Theory of Elasticity of Quasicrystals and Its Applications ( Science Press, Beijing 2010)

Introduction Brick is one kind of building materials with long history.
Set type of all material for isotropic.
Acknowledgements Thanks for the support of national natural science funds project (50978177) and Shanxi Province science research project (20110313026-3).
Journal of Building Structures.
China Civil Engineering Journal, Vol. 43 (2010) p.42-47.

In this paper, the method is optimized and improved, high-quality graphene is obtained, the dispersion stability and antifriction performance of graphene in water are investigated, and lubrication mechanism is preliminary studied. 2 Experimental 2.1 Materials and Prepatation (1) Materials and equipment Expand graphite with an average particle size of industrial-grade 300 mesh was purchased from Qingdao Ouer Company (Qingdao, China).
Ultrasonic cell grinder HN-1000Y and Ultrasonic emulsifying materials disperser HN-1000 were purchased from Shanghai Hannuo instrument Company (Shanghai, China).
Science. 320 (2008) 1308
Journal of Materials Science. 37 (2002) 5283-5290
Frontier Science. 5 (2011) 40-47

Jones, Materials Science and Engineering A61 (2003), 213-224
Kirkwood, Materials Science Forum, 396-402 (2002), 131-136
Oh, Journal of Materials Processing Technology, 130-131 (2002), 587-593
Bryant, Materials Science Forum, 331-337 (2000), 247- 252
Kapranos, Journal of Materials Processing Technology, 130-131 (2002), 594- 598

Journal of Materials Processing Technology. 142(2003)493-507
Materials and Design. 34(2012)90-97
Materials Science and Engineering A. 528(2011)5649-5655
Materials Science and Engineering A. 489(2008) 220-226
Materials and Design. 36(2012)590-596