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There are many factors that influence the drill performance including the drill point geometry, and the drill and work piece materials, respectively.
Acknowledgement The project is sponsored by the Natural Science Foundation of Liaoning Province, P.
Oancea: Journal of Materials Processing Technology Vol. 209 (2009), p. 3460 [2] J.A.
Du: International Journal of Machine Tools & Manufacture, Vol. 42(2002), p. 299 [3] D.A.
Wu: ASME Journal of Engineering for Industry, Vol. 101 (1979), p. 205 [5] M.A.

SHUHAIMI2,d, AZLAN BAHRIN1,e 1Nano-optoelectronics Research and Technology, School of Physics, UniversitiSains Malaysia, 11800 Penang, Malaysia 2Low Dimensional Materials Research Centre (LDMRC), Department of Physics, Faculty of Science, University of Malaya, LembahPantai, 50603 Kuala Lumpur, Malaysia Email: aez.azimah@gmail.com, bnorzaini@usm.my, czai@usm.my, dshuhaimi@um.edu.my, eazlanbaharin@usm.my Keywords: Mg doped GaN, PL, I-V, annealing temperature.
Apossible evidence of Mg related emission in Mg doped GaN material is observed inoptical measurement, even without thermal annealing.
Materials and Method In this work, we used a commercial Mg doped GaN sample grown on sapphire substrate.
Sánchez: Material Science and Engineering B Vol. 174 (2010), p. 263 [6] J.O.
Kim: Journal of the Korean Physical Society Vol. 53 (2008), p. 3681 .

[3] McLelland ARA, Henderson NG, Atkinson HV, Kirkwood DH, Anomalous rheological behaviour of semi-solid alloy slurries at low shear rates, Materials Science and Engineering: A (1997) 232, 110-118
[5] Brabazon D, Browne DJ, Carr AJ, Mechanical stir casting of aluminium alloys from the mushy state: process, microstructure and mechanical properties, Materials Science and Engineering A (2002) A326, 370-381
[8] Chayong S, Atkinson HV, Kapranos P, Thixoforming 7075 aluminium alloys, Materials Science and Engineering A (2005) A390, 3-12
Ghomashchi, The implication of rheology in semi-solid metal processes: An overview, Journal of Materials Processing Technology (2007)182, 229-240
Key Engineering Materials (2013) 554-557, 582-595

Materials and Methods Materials and reagents.
Journal of Molecular Structure. 30(2001) 341-346
Journal of Polyhedron. 12(2006)1-9
Journal of Harbin University of Commerce (Natural Sciences Edition). 21(2005) 93-95(in Chinese) [6] Suyun Gao, Sitie Pan, Kangquan Guo.
Food Science. 24 (2003) 117-120(in Chinese) [7] Qingling Xu, Lei Yan.

Introduction With the in-depth research of biological materials, an increasing number of intelligent materials have been developed.
Currently, most water-sensitive materials are used as adhesives.
Zhang, Development of chitosan/glycerophosphate/collagen thermo-sensitive hydrogel for endoscopic treatment of mucosectomy-induced ulcer, Materials Science and Engineering, 103 (2019) 109870
Ahearne, Potential for combined delivery of riboflavin and all-trans retinoic acid, from silk fibroin for corneal bioengineering, Materials Science and Engineering: C, 105 (2019) 110093
Yang, SiO@CuS nanotubes for photo/chemodynamic and photo-thermal dual-mode synergistic therapy under 808 nm laser irradiation, Journal of materials chemistry.

The element constitutive law considers the fracture energy of the material and its spatial variation are used to take into account the heterogeneity of the simulated materials.
The softening law for quasi-brittle materials proposed by Hilleborg[3] was adopted to handle the behavior of quasi-brittle materials.
The shape of the failure surface presented in Fig. 6a is similar to that obtained for fragile materials.
This rate is similar to the values found in almost fragile real materials as concrete or rock [6, 7, 8, 9, 10].
Mansour, Biaxial strength and deformational behavior of plain and steel fiber concrete, ACI Material Journal, 354–362, 1991

For metallic materials, K is much larger than the value of 1, are strongly absorbing materials, other than much thin sheets, the laser penetration depth is much smaller than the thickness of material.
Absorption Characteristics of Nanometers Materials.
(In Chinese) [3] Run Wu, Chang sheng Xie andAihua Wang: Chinese Journal of Lasers Vol. 30 , No. 11 November , 2003 pp.1053-1056.
(In Chinese) [4] Xiaojuan Tao: Gansu Science and Technology Vol.25 No．9 May 2009 pp.1053-1056.
[6] Zhang Lide:Nano Materials Science( Liaoning Science and Technology Press, China 1994)

Study on the necessity for deironing from Al-Si alloys prepared by CFA via hydrometallurgy pretreatment Ziliang Liu1,b, Keqiang Xie*1,2,3,a, Wenhui Ma1,2,3,c, Yang Zhou1,2,3, Yi Wang1 1Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China 2State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization， Kunming University of Science and Technology, Kunming 650093, China 3National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China axkqzhh@sina.com,bLZL09137@163.com, cmwhsilicon@163.com Key words: CFA; comprehensive utilization; deironing; Al-Si alloys; hydrometallurgy Abstract: Coal fly ash (CFA), as a major solid waste of coal-fired power plants in China, is widely applied in building materials, pavement, and soil improvement.
Hu: Procedia Environmental Sciences, Vol. 16 (2013), p. 690. ].
Several methods for processing of the CFA have been suggested, including building materials production, roads construction, backfill and agriculture field application [[] F.
Moustafa: Journal of materials processing technology, Vol. 209 (2009), p. 605. ] and Chong LIN [[] C.
Taylor: Procedia Materials Science.

After the coating has been applied to the testing materials, the thickness and lightness are measured.
In the study on coating materials and base materials, Grozdits et al., used surfactant to process a particle board adhered by lignin, and then covered it with acrylic coating.
As environmental awareness has increased in recent years, in order to reduce environmental pollution, improve the quality of life, and remove pollutants, eco-materials are being actively developed, for example, photocatalyst materials such as TiO2, CdS, ZnO, and WO3.
The source of reaction energy for photocatalyst materials is natural sunlight, so these materials are considered to be eco-materials.
Yavuzcan: Journal of Applied Polymer Science Vol. 93 (2004), p. 498

Materials Used and Mix Proportion The binder materials were GGBFS classified as Type 3 in accordance with KS F 2563 and FA Type 2 (KS L 5405).
The chemical composition of the binder materials is summarized in Table 1.
Physical and chemical properties of binder materials Materials SiO2 Fe2O3 Al2O3 CaO MgO SO3 K2O GGBFS 33.7 0.11 13.8 44.04 5.20 1.23 0.48 FA 51.7 7.4 24.0 5.4 1.6 0.3 0.0 The mix proportion used in this study is summarized in Table 2.
[5] NK Lee, GH An, KT Koh, and GS Ryu, “Improved reactivity of fly ash-slag geopolymer by the addition of silica fume”, Advances in Materials Science and Engineering, Vol. 2016, Article ID 2192053, pp. 1~11, 2016 [6] Bernal, S.
About materials and binders manufacture”, Construction and Building Materials, Vol.22, 2008, pp.1315-1322.