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Biomaterials derived from natural sources can be categorized into four main groups: protein-based materials, polysaccharide-based materials, glycosaminoglycan-based materials, and extracellular matrix materials.
Liebold–Ribeiro, “A systematic approach to identify cellular auxetic materials,” Smart Materials and Structures, vol. 24, Feb. 2015.
Chen, “3d–printed biomaterials with regional auxetic properties,” Journal of the Mechanical Behavior of Biomedical Materials, vol. 76, May 2017.
Ren, “Auxetic cellular materials - a review,” Strojniški vestnik – Journal of Mechanical Engineering, vol. 62, pp. 485–493, Sep. 2016.
Langer, “Transport rates of proteins in porous materials with known microgeometry,” Biophysical Journal, vol. 55, no. 1, pp. 163–171, 1989, ISSN: 0006-3495.

SLS’s appearance provide a new direction for the research in many fields like medicine, nano-materials, new materials, and so on[8,9].
However, the most of the researches are aimed at organic, non-metallic materials.
Experiment Materials The experimental material is the powder mixed metal with organic resin.
The chemical composition and properties of the materials was shown in Table 1 and Table 2 below.
European Polymer Journal (2012) 1~11 [3]B.

In the development process of nano-silicon film solar cell, whether to control the conductivity type and conductivity through doping is one of the crucial factors that determine the practicality of nanocrystalline silicon film materials.
References [1] Zhou Ruifa, Han Yafang and Chen Xiangbao: Nanometer Functional Composite Materials and Applications [M].
Journal of Functional Materials and Devices , Vol. 9, p. 25 [8] Guo Qunchao, Geng Xinhua and Zhang Jianxin: Influence of Doping on Growth of Silicon Window Layers [J].
Journal of Functional Materials Vol. 25 (1994), p.525 [12] Hu Zhihua, Liao Xianbo and Diao Hongwei: NIP a-Si∶H Solar Cells on Stainless Steel with p-type nc-Si:H Window Layer [J].Acta Physica Sinica Vol. 54 (2005), p.2945 [13] Wan Mingfang, Wei Xiwen and He Yuliang: Study of Preparation Technology of Nano-crystalline Silicon [J].
Journal of Dalian University of Technology Vol. 35 (1995), p.801

Students of science and technology competition designed selection and elimination mechanism.
To further encourage the enthusiasm of the students participating in order to encourage the spirit of encouragement and material combination.
Science and Technology Competition for College Students study the impact of culture [J].
[3] Gu Hongxin. to science and technology as the Carrier of Innovative Students [J].
Journal of Education, 2009 (3) :108-113.

Generally, sheet metals are hardening materials, thus, considering influence of hardening rule is necessary in the calculation of springback compensation.
International Journal of Pressure Vessels and Piping, Vol.79, (2002), p.289 [2]T.
Materials Processing Technology, Vol.209, (2009), p.4062 [4]M.C.
International Journal of Plasticity, Vol.23, (2007), p.516 [5] D.J.
Journal of Shanghai Jiaotong University, Vol.40, (2006), p.1671

Nevertheless, this materials present some drawbacks related to delivery time and cost.
Consequently such materials seem adequate for the manufacturing of Ti-SPF dies, and preliminary industrial trials have confirmed the potential of such materials.
Lours: Materials Science Forum Vol.447-448 (2004), p.123
Bernhart: Mechanics of Materials, Volume 37, Issue 4, (2005) , p.427
Gurusamy: Journal of Material Science Vol.22 (1987), p.3103

Study on the Explosion Characteristic Parameters of Gasoline Vapor Inerted by CO2 Yang Du1,a, Jianjun Liang1,b, Shu Liu2,c, Xinsheng Jiang1,d, Haibing Qian1,e 1Department of Military Oil Supply, Logistical Engineering University, Chongqing, China 2School of Foreign Languages, Chongqing University of Arts and Sciences, Chongqing, China aduyang58@163.com, bcomet613@163.com, cliushu613@163.com, djxs_dy@163.com , eqhb309@163.com Keywords: gasoline vapor, explosion, Inerting, CO2 Abstract: This paper studied the characteristics parameters of gasoline vapor explosion through experiments in a φ0.48m * 28.69m long straight pipeline inerted by CO2.
Acknowledgments This work was supported by the National Natural Science Foundation of China (51276195), the Chongqing Key Laboratory of Fire and Explosion Safety (CSTC2010CA0005), and the Chongqing natural science fund (CSTC2011JJA00017).
References [1] Jianjun Liang, Xinsheng Jiang, Jianzhong Zhou. et al: Journal of Logistical Engineering University, Vol. 26(2010),p.33,(In Chinese) [2] Xinsheng Jiang, Yang Du, Jianjun Liang. et al: Journal of Northeastern University(Natural science), Vol.32(2011), p.19(In Chinese) [3] Jianjun Liang, Yang Du, Yihong Ou, et al: Advanced Materials Research, Vol. 724-725(2013), p.1192 [4].
Kosinski Pawel: Journal Of Hazardous Materials, Vol. 154(2008), p.981

Experimental analysis scheme[3] Escaping gas Waste sulfuric acid Washing liquid Washing slag Fig. 1 Abridged general view of scheme about analysis wasted sulfuric acid Materials and Methods[4,5,6,7,8] Materials.
Journal of polyvinyl chloride (PVC).11(2010)
China environmental science press, (2002)
Journal of chemical industry environmental protection. 3 (1999)
Journal of sulphuric acid industry. 5 (2008).

Ignjatović1,c 1 Institute of Technical Sciences of the Serbian Academy of Sciences and Arts, Belgrade, Serbia 2 Faculty of Technical Sciences, Čačak, Serbia a ivanajov@gmail.com, bmagir@eunet.yu, cadvamat@itn.sanu.ac.yu Keywords: Drug delivery, Microspheres, PLLA, Precipitation.
Albertsson: Advances in Polymer Science Vol. 157 (2002), p.67
Gander: Journal of Controlled Release Vol. 102 (2005), p. 313
Burt: International Journal of Pharmaceutics Vol. 222 (2001), p. 19
Uskoković: Journal of Material Sciences: Materials in Medicine, (2006 accepted)

The geometrical and material data were as follows: the strip half-width B =0.5m, E =2.1× 5 10 MPa, ν=0.3, thick=0.3mm.
References [1] F.D.Fischer, F.G.Rammerstorfer: International Journal of Mechanical Sciences, Vol.42(2000) No.1, p.1887
[2] N.Jacques, A.Elias, M.Potier-Ferry, and H.Zahrouni: Journal of Materials Processing Technology, Vol.190(2007) No.3, p.33
Leissa: International Journal of Solids and Structures, Vol.42(2005), p. 4220
[9] K.Komori: International Journal of Mechanical Sciences, Vol.40(1998), p.1235 [10] de Boor C: A practical guide of splines (Springer, U.S.A 2001)