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Therefore, through the system environment, the materials cycle, energy flow, money flow, information dissemination, knowledge exchange, technology diffusion and other activities happen among enterprises, enterprises and consumers, forming a self-organizing and self-regulatory ecological functional unit.
Journal of Cleaner Production.
Studies in Science of Science, Vol.24(Z2), (2006), p.431-437 [6] Hu Bin, Zhang Renjun: Dynamic evolutionary mechanism of business ecosystem.
Journal of China Agricultural University (Social Sciences Edition), Vol.1, (2004), p.50-55 [8] KongWen: Evolution of the Ecosystem of Mobile Communication, World Telecom, Vol. 15(1), (2002), p.25-29 [9] Li Dianwei, Zhao Liming: Development Strategy of Chinese Telecommunication Industry, Science &Technology Progress and Policy, Vol.24(3), (2007), p.75-78 [10] GUO Ning, LIANG Xiong-jia: An analysis of the industrial structure of communications based on the ecosystem.
Journal of Beijing University of Posts Telecom，Vol.4(2), (2005), p.39- 43 [11] Ma Ling, Pan Weijing: A study on the stability of telecom industry ecosystem, Science and Technology Management Research，Vol.29(9), (2009), p. 261-263.

XRD pattern of gel fibers heat treated at 80℃ for 24 h shows the materials have an amorphous Al13 structure, which is decomposed completely at 350℃.
Journal of Inorganic Materials, 19(2004, 2) 361-366.
Materials Letter, 3(2002) 189-195
Journal of Materials Processing Technology, 3(2006) 275-280
Journal of Materials Science，24(1989,3) 892-898

It was thought that a reduction of these problems could be achieved by improving the tool wear resistance such as using new tool materials, adapting tool geometries, and application of coating tool [4-6].
Acknowledgements This work was supported by “the National Natural Science Foundation of China (51075237)”, “the National Basic Research Program of China (2009CB724402)”, “the Taishan Scholar Program of Shandong Province”, “the Outstanding Young Scholar Science Foundation of Shandong (JQ200917)”, and “the National Natural Science Foundation of Shandong (ZR2010EZ002)”.
Ngoi: Journal of Materials Processing Technology Vol. 101 (2000), p. 287-291
Feng: Chinese Journal of Mechanical Engineering Vol. 38 (2002), p. 40-45
Shi, Solid lubricating materials (China Chemical Industry Press, China 2000)

Preparation of high-molecular-weight poly(glycolic acid) by direct melt polycondensation from glycolic acid Kai Shen1,a, Shenglin Yang2,b aState Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Shanghai 201620,China bCollege of Material Science and Engineering, Donghua University, Shanghai 201620,China aKay217@163.com, bslyang@dhu.edu.cn Keywords: Poly(glycolic acid); Melt Polycondensation; Characterization Abstract.
The structure and properties of PGA were also characterized by means of intrinsic viscosity, FTIR, NMR and DSC testing. 2 Experimental 2.1 Materials Monomer was purchased from Xinmao Chemical Co.
Journal of Polymer Science: Part A: Polymer Chemistry11(2008). p.3802–3812
Journal of Polymer Science: Part A: Polymer Chemistry. 14(2008), p.4704–4711
Journal of Beijing Institute of Technology. 4(2001),p.518-523.

They are frequently utilized as complex structural materials for submarines as a class of lightweight materials, including the torpedo's pressure shell and the bathyscaphe's pressure shell.
Prado, “Mechanical Properties of Glass Microspheres,” Procedia Materials Science, vol. 8, no.
Cheeseman, “A Comparative Study of Production of Glass Microspheres by using Thermal Process,” IOP Conference Series: Materials Science and Engineering, vol. 205, no. 1, 2017, doi: 10.1088/1757-899X/205/1/012022
Wang, “Surface Modification of Hollow Glass Microspheres,” Materials Sciences and Applications, vol. 03, no. 12, pp. 856–860, 2012, doi: 10.4236/msa.2012.312125
Wang et al., “Effect of sintering on porosity, phase, and surface morphology of spray dried hydroxyapatite microspheres,” Journal of Biomedical Materials Research - Part A, vol. 87, no. 2, pp. 557–562, 2008, doi: 10.1002/jbm.a.31895

Use of Algerian Natural Mineral Deposit as Supplementary Cementitious Materials Karima ARROUDJ1,a*, Saida DORBANI1,b, Mohamed Nadjib OUDJIT1,c and Arezki TAGNIT-HAMOU2,d 1Building in Environment Laboratory, Faculty of Civil Engineering, University of Sciences and Technology Houari Boumediene (USTHB), BP 32 EL Alia, Bba Ezzouar, Algiers, Algeria 2Cementitious Materials Laboratory, Department of Civil Engineering, Faculty of Engineering, 2500 Boul.
This means increasing research on new materials, that are sustainable, economic and ecologic, in other words eco-materials [1-4].
The aim of this study is to valorize two very abundant natural deposits in Algeria: ground natural pozzolan “PZ” and dune sand “SD” and to evaluate the effect of these powdered materials in cement-based materials.
[8] K.Al-Jabri, H.Shoukry, Use of nano-structured waste materials for improving mechanical, physical and structural properties of cement mortar, Construction and Building Materials, 73 (2014) 636–644
[20] K.Arroudj, M.Lanez, M.N.Oudjit & A.Tagnit-Hamou, Comparative Study of Chemical Activity of Different Ultrafine Cementitious Additions, International Journal of Advanced Materials Research, 01,N° 2 (2015) 45-52.

These active materials were then subjected to calcinations at various temperatures (100 – 400 oC) for 6 h in air.
Chin, Synthesis and Characterization of Magnetite/Carbon Nanocomposite Thin Films for Electrochemical Applications, Journal of Materials Science Technology 27 (2011) 873-878
Wu, Nanocrystalline oxide sueprcaapcitors, Materials Chemistry and Physics 75 (2002) 6-11
Grant, A novel hybrid supercapacitor with a carbon nanotube cathode and an iron oxide/carbon nanotube composite anode, Journal of Materials Chemistry 19 (46) (2009) 8755
Chen, Manganese oxide based materials for supercapacitors, Energy Materials: Materials Science and Engineering for Energy Systems 3 (3) (2008) 186-200

Experimental Procedure The purity of material was all 99.99%.
Acknowledgments This work was supported by natural science foundation of China under contract 61076004 and natural science foundation of Hebei province under contract E2009000050.
Hageman, “Thick GaN layers grown by HVPE: Influence of the templates”, Journal of Crystal Growth, vol.310, pp. 3957-3963, August 2008
Morkoc, “Comprehensive characterization of hydride VPE grown GaN layers and templates”, Materials Science and Engineering: R: Reports, vol.33, pp.135-207, June 2001
Cherenkov, et al., “High quality GaN layers grown by hydride vapor phase epitaxy — a high resolution X-ray diffractometry and synchrotron X-ray topography study”, Materials Science and Engineering B, vol. 78, pp. 22-27, October 2000.

Durability of FRP composite bridge deck materials under freeze-thaw and low temperature conditions [J].
Journal of Bridge Engineering, ASCE, 2006, 11(4): 443-451
Applied Composite Materials, 2003, 10(1): 19-48
KSCE, Journal of Civil Engineering, 2007, 11(5): 261-267
Department of Building Materials, Chalmers University of Technology.

Just as Wu [5] pointed out, “the soul of living environment is due to it can arouse people's soul, in the objective material world to create a more profound inner world."
Systematic analysis of GBE is to reveal the whole process of construction material basis and the technical means is taken as an organic whole, to study the realization of engineering overall practice method.
Journal of Chongqing University Social Science Edition (Chinese), 2010, 16(4):109~ 113 [3] Yin Ruiyu, Wang Yingluo, Li Bocong et al.
Journal of architecture, 2001-10 [5] Hao Liang Yong.
Chinese Journal of Environmental Science [J].