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Besides some harmful materials, there are lots of valuable materials in second-hand computers, most of them could be recycled and reused.
Fig.1 gives the proportion of main materials in second-hand computer.
Present state on the utilization of electronic waste materials and its development [J].
Journal of Tongji University (Social Science Section), 2002, 13 (1): 96-101 [13] WANG Geng.
Journal of social science of Jiamusi University, 2002, 20 (3): 41-42

Local heating inside the material is used to repair the binder and to improve the properties again.
The first prerequisite of induction heating is that the heated material must be conductive.
References [1] S. van der Zwaag, Self Healing Materials an Alternative Approach to 20 Centuries of Materials Science, Springer Series in Materials Science, 100, (2007), 205-218
Boonders, A laboratory investigation of the influence of rest periods on the fatigue characteristics of bituminous mixes, Journal of the Association of Asphalt Paving Technologists, 51, (1982), 104-128
Farrar, Electrically conductivity concrete, GEC Journal of Science and Technology, 45, No. 1, (1978), 45-48

Eriksen, Combined EBSD-investigations and in-situ tensile tests of a direct metal deposited Ti6Al4V-alloy, Materials Science and Engineering, 2013
Ramulu, Fatigue performance evaluation of selective laser melted Ti–6Al–4V, Materials Science and Engineering: A, 598 (2014), p. 327-337
Melz, Effect of surface roughness on fatigue performance of additive manufactured Ti-6Al-4V, in press, Materials Science and Technology, (2015)
Lee, High-cycle fatigue properties of investment cast Ti-6Al-4V alloy welds, Journal of materials science letters, 20 (2001), p. 2183-2187
Lütjering, Influence of processing on microstructure and mechanical properties of (α+β) titanium alloys, Materials Science and Engineering: A, 243 (1998), p. 32-45.

According to ASTM C 618 [2] pozzolanic materials can be described as materials containing siliceous and aluminous material by composition.
Materials and Methods Ordinary Portland cement (OPC) supplied by Cement Industries of Malaysia, Berhad was used as the main binder material.
Materials & Design, 59, 532-539
Australian Journal of Basic & Applied Sciences, 6
Journal of Materials in Civil Engineering, 16, 623-628

Introduction Nanotechnology is facilitating technology that allows us to develop materials with improved properties[1].
Advances in Materials Research. 7(3) (2018) 163-174
Mechanics of Composite Materials. 53(6) (2018) 827-836
Journal of Material Science and Technology. 23(7) (1988) 2379-2381
Materials Science-Poland. 25(4) (2007) 1143-1148

Active Vibration Control of Piezoelectric Material Using Fuzzy Logic Controller Tao Hu1,2,a, Qibai Huang1,2,b,Shande Li1,2,c 1School of Mechanical Science & Engineering, Huazhong University of Science & Technology, Wuhan, 430074, PR China 2Hubei Institute of Specialty Vehicle, Suizhou, 441300, PR China aemail: alvin.hutao@foxmail.com, bemail: qbhuang@mail.hust.edu.cn, cemail: lishande@foxmail.com, Keywords: active vibration control, fuzzy logic controller, PID control, piezoelectric actuator/sensor Abstract.
Piezoelectric actuators are being increasingly studied and used in different areas of science and technology due to their nanometer displacement resolution, wide bandwidth, fast response and high stiffness [2].
Consequently, the feasibility of adopting piezoelectric materials as actuators and sensors for controlling vibrations in flexible structures has received increasing attention.
Piezoelectric materials provide inexpensive, reliable, and non-intrusive means of actuating and sensing vibrations in flexible structures.
[2] Morteza Mohammadzaheri, Steven Grainger, Mohsen Bazghaleh, Fuzzy Modeling of a piezoelectric actuator, International Journal of Precision Engineering and Manufacturing, May 2012, Volume 13, Issue 5, pp 663-670 [3] D.

Si3N4-SiC composite ceramic, a type of radar wave-absorbing materials (RAW), was prepared by vacuum-sintering.
References [1] DDL Chung, Electromagnetic interference shielding effectiveness of carbon materials, Carbon. 39 (2001) 279-285
Li, et al., A Method to Adjust Dielectric Property of SiC Powder in the GHz Range, Journal of materials science &technology. 27(2011) 421-425
Wang, et al., Complex permittivity and microwave absorbing property of Si3N4-SiC composite ceramic, Journal of materials science &technology. 28(2012) 745-750
Krstic, Pressureless sintering of b- SiC with Al2O3 additions, Journal of Materials Science. 29 (1994) 934-938

Currently, silicon (Si) and wide band gap materials such as diamond and gallium nitride (GaN) have been used in the UV sensor applications.
However, the fabrication cost using these materials is very expensive due to device configuration and fabrication equipments.
The authors thank the Faculty of Applied Sciences at UiTM for the use of their FESEM facility.
Rusop, Novel synthesis of aligned Zinc oxide nanorods on a glass substrate by sonicated sol-gel immersion, Materials Letters (2010) 1211-1214
Rusop, Influence of doping concentrations on the aluminum doped zinc oxide thin films properties for ultraviolet photoconductive sensor applications, Optical Materials (2010) 696-699

Nanjing University of Science and Technology,2013
The performance of ruthenium oxide / graphene composite material supercapacitor [J].Materials and Structures，2013，50（6）：347-352
Materials Letters, 2012, 76: 127-130
Ordnance material science and Engineering, 2014, 37（3）
Journal of electrochemistry, 2013, 19(4):361-369

Materials Letters.
Journal of Materials Processing Technology Vol. 199(2008), p.10 [10] WANG LI-jiu, ZHAO Shan-yu, YANG Mei.
Materials Chemistry and Physics Vol. 113(2009), p.485
Materials Science and Engineering C Vol.27 (2007) , p.1291 [16] A.
Journal of Materials Processing Technology Vol.209 (2009) , p. 5601 [20] Emel I.