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Material and methods Isolation and selection of microorganism.
Acknowledgements This work was financially supported by the Science and Technology Research Project of Heilongjiang Provincial Education Department.
Ghaemi: SPE 80529 [6] Ruixia Hao, Anhuai Lu and Yishan Zeng: Journal of Petroleum Science and Engineering, Vol. 43 (2004), p. 247 [7] Pål V.
Hemmingsen, Anne Silset and Andreas Hannisdal: Journal of Dispersion Science and Technology, Vol. 26 (2005), p. 615 [8] Asma Etoumi: Journal of Petroleum Science and Engineering, Vol. 55 (2007), p. 111 [9] Wang, B., Dong, L.: SPE 29954 [10] Santamaria, M.
M.: SPE 22851 [11] Zhengguo He and Bowen Mei: Petroleum Science and Technology, Vol. 21 (2003), p. 201

Study on exit flow rate of an one-exit room Xiaoge Wei 1, a, Weiguo Song 1,b and Wei Lv 1,c 1 State Key Laboratory of Fire Science, University of Science and Technology of China, Jinzhai 96, Hefei 230026, Anhui, P.
A cellular automata evacuation model considering , friction and repulsion, Science in China ser.E Engineering & Materìals Science 48, p.403-413
EVACNET: a computer program to determine optimal building evacuation plans, Fire Safety Journal 9, p.11-20
The study on the network evacuation model for pedestrians evacuation in building., Fire Safety Journal 13, p.90-94
Application of Discrete Time Evacuation Model into Design of Building Egress, Journal of Tianjin University 41, p.65-71

Synthesis and Characterization of Amphiphilic Copolymer poly [2-(dimethylamino)ethyl methacrylate-Co-methyl Methacrylate] FangPing Wanga, Ting Yuanb, Wanxia Lic, Junying Zhangd, Qi zhao Wange Key Laboratory of Bioelectrochemistry & Environmental Analysis of Gansu Province, Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education of China, College of Chemistry and Chemical Engineering, Northwest Normal University, Anning Road 967,Lanzhou 730070, China a wangfp@nwnu.edu.cn, b yuanting@163.com , c liwx@126.com d zhangjunying@126.com , e wangqizhao@163.com Keywords: Amphiphilic copolymer, RAFT, Polymerization, Methyl methacrylate Abstract： A novel, well-defined, amphiphilic block copolymer was synthesized by RAFT copolymerization of 2-(dimethylamino) ethyl methacrylate (DMAEMA) and methyl methacrylate (MMA).
Experimental Materials Trithiocarbonate RAFT agent had been synthesized in our laboratory according to the literature [15].
Acknowledgements This work was financially supported by the National Natural Science Foundation of China (21065010, 51262028), the Key Laboratory of Eco-Environment-Related Polymer Materials Ministry of Education and the Key Laboratory of Polymer Materials of Gansu Province of China.
Takeshi: Journal of Polymer Science: Part A: Polymer Chemistry, 47(2009), p.3702

[3]Lu J X, Wang L, Production and Application of High Strength Automotive Steel[J ],Automotive Technology and Materials, 2004, (2):1~6
Characteristics and Application of High Strength Automotive Steel[J ],Automotive Technology and Materials, 2004, (6):13~15
[8]R.O.Rocha, T.M.F.Melo, E.V.Pereloma, D.B.Santos, “Microstructure evolution at the initial stages of continuous annealing of cold rolled dual phase steel”, Materials Science and Engineering A, Vol.391, 2005, p.296~304
[10]M.ERDOGAN, “The effect of new ferrite content on the tensile fracture behaviour of dual phase steels”, Journal of Materials Science, Vol.37, 2002, p.3623~3630

Wang, Application of IOT Technologies in Campus Security System, Advanced Materials Research. 964 (2011) 401-403
Wang, Architecture of Campus Security Management System Based on WCF and RFID Technology, Applied Mechanics and Materials. 462 (2013) 411-414
Gao, Study on IOT based architecture of logistics service supply chain, International Journal of Grid and Distributed Computing. (2014) 169-178
Guo, Application models of IOT, Applied Mechanics and Materials. 1983 (2013) 416-417
Liu, A RFID controller with contactless cards for internet of things, Applied Mechanics and Materials. 2521 (2013) 336-2521

The theory using the unified mechanical model, concise mathematical expressions, flexible and applicable to various features of material, its mathematical expression is: 　 　when (1a) when (1b) ,, as the material of the principal stress; as the material of tension and compression ratio; as the shear yield limit; as the compression of material yield limit; as the tensile yield limit of materials; Ductile metal materials Generally is 0.77 ~ 1.0, brittle metal material is 0.33 ~ 0.77, geotechnical materials Generally is less than 0.5, concrete is generally 0.065 ~ 0.100. b(0 ≤ b ≤1) is reflecting intermediate principal shear stress and normal stress on the material damage on the surface of the impact of material strength parameters.
Most metal materials have obvious yield point, and the tensile strength and compressive strength are equal.
England: Elsevier Science LTD, 2005: 701- 706 in Chinese [5] ZHAO Junhai.
Beijing :Science Press，2003.87~91. in Chinese [6] Qingli Wang, Wei Gu, Yinghua Zhao.
China Civil Engineering Journal, 2005, 38( 10) : 44- 48 in Chinese

This method is much more viable due to the availability of equipment and materials such as an Electron Beam Evaporation machine.
View inside the chamber and adjust the electron beam so that it hits the middle of the deposition material. 8.
Due to the elasticity of the gold material, the gold is still connected together without major micro cracks.
Longaker, Histologic study of artificial skin used in the treatment of full-thickness thermal injury, Journal of Burn Care & Rehabilitation, 11(1), p. 7-13 (1990)
Wagner, Sensitive skins: electronics on flexible substrates', IEEE Sensors Journal, 1(1), (June 2001)

Therefore it has been always tried to compensate this disadvantage with different procedures in order to utilize the material strength reserves especially in higher strength materials.
The principles of x-ray analysis of residual stresses and materials are explicitly covered by Hauk [12].
In the concept local fatigue strength [17], the influence of residual stress on fatigue of materials in general has been taken into consideration.
Klaus, Residual Stress Field Measurements in Welds by Means of X-ray, Synchrotron and Neutron Diffraction, Journal of Materials Science and Engineering Technology 42(11) (2011) 996-1001
Barsoum, Fatigue design of welded structures-some aspects of weld quality and residual stresses, International Journal of Materials Joining, Welding in the World, No. 11/12, Vol. 55, 2011

Construction and Building Materials, 25: (2011) ,785-790
Silva, “Statistical modelling of the resistance to chloride penetration in concrete with recycled aggregates”, Construction and Building Materials, Volume 182, (2018), Pages 550-560,ISSN 0950-0618, [4] G.
International Journal of Electrochemical Science, Vol.9, No.1, pp. 282 – 291 [5] P.
Ramachandra Murthy “Tensile behavior and durability aspects of sustainable ultra-high performance concrete incorporated with GGBS as cementitious material”, Construction and Building Materials, Volume 197, (2019), Pages 667-680,ISSN 0950-0618 [6] G.
Madhavi etal Chloride Penetration in Fly Ash Concrete IJRET: International Journal of Research in Engineering and Technology Vol 4 ,2015 4 February (2015)

Introduction Engine valve is one of the key parts of the engine, its umbrella head and guide rod parts of the size difference is very big, umbrella head is to use hot forging process manufacturing, because umbrella head for high temperature resistance and corrosion resistance, its material generally uses 5Cr21Mn9Ni4N etc austenitic heat resistant steel manufacturing, these materials alloy content is very high.
The hot forging die be used to forge valve umbrella head, the austenitic steel materials manufacturing, monolithic hot die with life short.
At present domestic materials ability high temperature fatigue at the same time and under high temperature to maintain high hardness material basically has two kinds: one kind is hard alloy steel; Another kind is high speed steel.
Valve material 5Cr21Mn9Ni4N contained in the alloy element is mainly Cr, Mn, Ni, N, the Cr content as high as 21%, mould materials used in the W6Cr5Mo4V2, When not to when nitrogen treatment, the alloy elements as the main for W, Cr, Mo, V, and 5Cr21Mn9Ni4N compared with only a kind of alloy element Cr the same, and When containing Cr quantity and large difference (in 6Cr5Mo4V2, Cr content is about 5%) and not to the nitrogen treatment , so the two kinds of material performance is large.
Journal of south China university of technology: natural science edition, 2001, 29 (4) : 95-96.