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The O/C ratio of GO and rGO materials (from graphite) are 0.687 and 0.05 [14].
The characteristics of rGO materials are observed in both H-CS3.1 and H-CS3.2 materials, consistent with research on producing rGO from graphite materials [14].
Effect of Carbonization Temperature on Properties of Char and Activated Carbon from Coconut Shell, Suranaree Journal of Science and Technology. 20 (2013) 269–278
Removal of Methylene Blue by Adsorption onto Activated Carbon from Coconut Shell (Cocous Nucifera L.), Indonesian Journal of Science & Technology. 4 (2019) 229–240
How to Read and Interpret FTIR Spectroscope of Organic Material, Indonesian Journal of Science and Technology. 4 (2019) 97–118

Ren:Polymeric Materials Science & Engineering, 2005,21(1): 276 [6] H.
Fang: Journal of Materials Science& Engineering, 2003, 21(6):842 [7] D.
Aspects 301 (2007) 41 [11] Ahmet Sarı, Ali Karaipekli: Materials Letters 62 (2008) 903 [12] C.
Zhang: Polymer Materials Science & Engineering, 2001, 17(5): 137 [13] Y.
Gao: Journal of Tongji University(NaturalScience), 1993, 21(2)555

Based on the gradient source representation of functionally gradient materials Qiang Li1,2, a , Mingqing Wu1,b 1Shandong Transport Vocational College, Shandong Weifang, 261206, China; 2School of Transportation Science and Engineering, Beihang University, Beijing, 100191, China; aljzylq@126.com; bwmq1977@qq.com  Keywords: functionally gradient material (FGM), grading source,function image Abstract.
Therefore, in the course of modeling, functional gradient materials are generally a one-dimensional entity model.
The information mathematical description of functionally gradient materials The material composition array: Define an array of for functionally gradient materials entity within the material composition of each.
References [1] CHENG Xiao-nong,DAI Qi-xun,ZHAO Yu-tao.et a1．Developmem of materials calculation design.journal of Jiangsu university,2003,24 (1): 15-18(in chinese) [2] Siu.Y K,Tan.S.T.”Source based” hererogeneous solid modeling.Computer Aided Design, 2002, 34 (1);41-55 [3] WU Xiao-jun,LIU Wei-jun,WANG Tian-ran.Heterogeneous material objects modeling for 3D CAD part.Chinese Journal of Mechanical Engineering,2004,40 (5):111-117.
(in chinese) [5] Zhou Manyuan,Xi Juntong,Yan Junqi.Modeling and processing of functionally graded materials for rapid prototyping.Jourmal of Materials Processing Thecnology,2004,146(3):396-402.

The Research on Material Balance Considering In-Seam and Intrabed Water Xinan Yu1,a, Hong Liu 2,b, Jihua Cao3,c and Jin Pang4,d 1,2,4Chongqing University of Science and Technology,China 3The geological institute of natural gas developing company in QingHai oil field,China ayxndavid@163.com,bliubrett@vip.sina.com,ccjhqh@petrochina.com,d3880896@qq.com Key words: in-seam water,intrabed water,material balance equation,dynamic reserve Abstract.
References [1] Yu Jin,Li Yun.The study process of gas and water two phases flowing through porous medium about water-driving gas reservoir.The journal of Southwest Petroluem University,2003.6,25 (3)
[2] Zhu HuaYin,FuDaQi.The expenrimental research about mechanism of fluid flowing through porous medium in low permeable gas reservoir.The journal of natural gas exploration and developmeng,32 (3)
[3] Qiu ZhongXian,Liu Yue Tian,Tu Bing.The mechanism of Non-Darcy flowing through low permeable porous medium.The journal of special oil and gas reservoir,2009.2,16 (1)
[4] Ashford F E.An evaluation of criticalmultiphase flow per-formance through wellhead chokes[J].Journal of Petroleum Technology,1974,8: 843-850

Particular focus has been given to fracturing heterogeneous materials.
Feyel, Multiscale FE2 elastoviscoplastic analysis of composite structures, Computational Materials Science, 16: 344–354, 1999
Brekelmans, Multi-scale constitutive modelling of heterogeneous materials with a gradient-enhanced computational homogenization scheme, International Journal for Numerical Methods in Engineering, 54: 1235–1260, 2002
Song, Multiscale aggregating discontinuities: A method for circumventing loss of material stability, International Journal for Numerical Methods in Engineering, 73: 869–894, 2008
Sluys, Coupled-volume multi-scale modelling of quasi brittle material, European Journal of Mechanics A/Solids, 27: 302–327, 2008

Functionally graded materials (FGMs) are advanced composites composed of different phases of constituents generally hybrid material ceramic and metal used in structures where high temperature and high strength materials are desired.
Introduction In the field of materials science, functionally graded materials (FGMs) are a relatively recent trend.
The FGMs are advanced composite materials with a progressive and continuous variation in the volume fractions of each ingredient, resulting in changes in the materials' properties and removing discontinuities at interfaces while preserving the constituent materials' characteristics.
[4] Niino, M., Maeda, S., Recent development status of functionally gradient materials.
[28] Merdaci, S., Hadj Mostefa, A., Belghoul, H., Rossana, D., and Francesco, T., Higher-Order Free Vibration Analysis of Porous Functionally Graded Plates, Journal of Composites Science (J.

There are a lot of teaching materials of present digitization, some teaching materials can only attract student's transient interest.
Journal of Management Information Systems, 19(1), 99-127
Australian Journal of Educational Technology, 2002, 16(2), 161-172
International Journal of Instructional Media, 27(2), 199-207
Journal of the American Society for Information Science, 45(7), 515-528

The microhardness test offers a simple and nondestructive tool for investigating the mechanical behavior of polymer materials.
The microhardness testing offers a simple and nondestructive tool for investigating the mechanical behavior of polymer materials [7, 8].
Journal of Materials Science, 24 (1989) 173-82
Journal of Materials Science and Engineering, 5 (2011) 26-31 [11] E.H.Lee, G.R.Rao, L.K.Mansur, LET Effect on cross-linking and scission mechanisms of PMMA during irradiation, Radiation Physics and Chemistry, 55 (1999) 293-305
Materials Science Forum, 363-365 (2001) 652- 4

It consumes more than 25 % of the raw materials consumed in the EU [1].
Materials and Methods Three different materials are going to be analyzed for their use as aggregate in mortars: a natural aggregate, a ceramic waste and a concrete waste.
The chemical composition by XRF of the materials is shown in the next table.
It is proposed to carry out mortar mixes to compare the behavior of natural materials with the behavior of aggregate substitutions by recycled materials.
On the other hand, the ceramic materials are more brittle than concrete materials so ceramic aggregates waste will reduce the mortar strength.

Experimental Procedures Materials Preparation.
Machado: Journal of the Brazilian Society of Mechanical Sciences and Engineering Vol. 26 (2004), p. 12 [3] B.
Mill: Journal of Materials Processing Technology Vol. 56 (1996), p. 16 [4] X.
Lü: Materials Letters Vol. 60 (2006), p. 2810 [8] B.
Lauwers: Materials Science Forum Vol. 492-493 (2005), p. 27 [11] F.