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In 1952 Drucker-Prager: (1) In the formula: —the average stress;—the first invariant of stress;—the second invariant of the stress; ,—material parameter.
Moreover, presents expanding angle which can be used to control the volume expansion, for compacted granular materials the granule will expand when the material is in shear, if, the material will expand seriously, is a conservative way generally[4].
Acknowledgements This work was financially supported by Innovation Program of Inner Mongolia University of Science & Technology in China (NO.2010NC050, 2011NCL033, 2009NC049).
[2] Xianrui Meng, Yongyong Xu, Huanyu Liu: Journal of China Coal Society, pp.58-62, 2000, in Chinese
[3] Shuren Wang: Journal of University of Science and Technology Beijing, vol.1, pp. 69-78, 2005, in Chinese

Introduction The nanometer particles Co3O4 is excellent as the material for making Li-ion battery[1], and has been widely used in many industrial fields such as ceramic[2] ,catalyst and the magnetic materials [3].
Experimentation CoCl2.6H2O and NH3.H2O were used as starting materials in this study, and all of them are analytical reagents.
Journal of Environmental Sciences.
Vol. 18(5) (1998), p. 457 [3] Jonas Jansson, Anders E C Palmqvist. etal, Journal of Catalysis .
Vol. 25(3) (2002), p.387 [4]Jin zhang Gao, etc Materilas Vol(10) (1),P.54 [5]Yang huaming, Li yunlong. etal, Transactions of Materials and Heat Treatment.

Materials and methods Study area The study area is the Zhejiang coastal water zone, which covers from 27°10′N to31°30′N, from 120°32′E to 123°28′E, as shown in Fig.1.
Journal of coastal research, Vol.
Science and Art.
Journal of Geographical Sciences, Vol.16 (2006), p. 447-457
Journal of natural disasters.

The calculated elastic properties are coherent with the elastic properties of the material.
Among these materials, Ti3Al presents an anomalous (positive) temperature dependence of yield and flow strength with a high ordering energy, and this is the basis for the mechanical properties of modern superalloys[1].
Elastic properties The elastic constant is correlated to the strength of materials.
The Young modulus, shear modulus, Zener modulus (anisotropy), and Poisson modulus are frequently measured for polycrystalline materials when investigating hardness in order to demonstrate the relationship between microscopic and macroscopic quantities.
,Varanda, C., Jafelicci Jr,M., Structural phase transition study of FePt alloys using ab initio calculation Materials Science and Engineering A, 521-522 (2009) 167-168 [7] Blöchl, P., Jespen, O., Andersen, O.K., Improved tetrahedron for Brillouin - zone integration Physical Review B, 49 (1994) 16223-16233 [8] Murnaghan,F.D., The compressibility of media under extreme pressure Proceeding of Natural Academic Science USA, 30 (1944)244-247 [9] Ashizuka,M., and Murkami,M., Elastic modulus, vicker hardness, and fracture toughness of MO.2Ba2O3 (M=Ca,Sr,Ba) and M2O.2Ba2O3(M=Li,Na,K) glasses Journal Japan Institute of Metals 53 (1989) 88-92 1989 [10] Sung, C., and Sung,M., Carbon nitride and other speculative superhard materials Material Chemistry and Physics 43 (1996) 1-18

Materials and methods 1.1 Materials Thirteen blueberry cultivars were obtained from blueberry farms of Institute of Botany, Jiangsu Province and the Chinese Academy of Sciences in Lishui, including 8 Rabbiteye such as Powder Blue, Garden Blue, Rifblue, Brightwell, Climax, Woodard, Blue Belle and Polific, and 5 Southern Highbush such as Sharpblue, ZX3, ZX4, ZX7 and ZX8.
Journal of Plant Resources and Environment. 10 (2001) 52-55.
Journal of Plant Resources and Environment. 7 (1998) 33-37.
Journal of Plant Resources and Environment. 7 (1998) 28-32.
American Journal of Enology and Viticulture. 16 (1965) 144-158

Smart Materials and Structures. 2012;21:105026
Composites Science and Technology. 2012;72:498–505
Advanced Composite Materials. 2012;21:357–369
Journal of Intelligent Material Systems and Structures. 2000;11:180–190
Journal of Intelligent Material Systems and Structures. 2013;24:559–573.

Raw Materials Kaolin which is the main ingredient was purchased from Associated Kaolin Industries Sdn.
Applied Clay Science, 43,218-223
Construction and Building Materials, 24, 1176-1183
[8] Duxson, Lukey and Van Deventer (2007).Physical evolution of Na-geopolymer derived from metakaolin up to 1000°C.Journal of Materials Science, 42,3044-3054
Materials de Construction, 57, 7-22

Lin and H Lin: Juncao Science (Agricultural Science and Technology Publications, Beijing 1986)
[2] C.C Okaraonye and J.C Ikewuchi: submitted to Pakistan Journal of Nutrition (2009) [3] A.E Majule, M.J Mbonile and D.J Campbell: submitted to African journal of ecology (2009) [4] X.S Lin, Lin Z.X, D.M Lin, H.
Yang: submitted to Journal of Agricultural Mechanization Research (2014) [6] Y.Q Gu, H.L Jia, H.
Guo and W.G Zhao, X.T Zhao: submitted to Transactions of the Chinese Society for Agricultural Machinery (2013) [7] S.H Zhao, Y.Q Yang and Y.X Yan, B.L Tian: submitted to Journal of Northeast Agricultural University (2013) [8] H.F An: submitted to Agricultural Science & Technology and Equipment (2013) [9] J.P Xu, Y.F Xie and T.
Xu: submitted to Journal of Agricultural Mechanization Research (2011) [10] Y.

Parallel systems belong to the systems science.
Repast (Recursive Porous Agent Simulation Toolkit) is a kind of Agent-based computer simulation architecture, developed by Social Science Computing Research Center, University of Chicago.
References [1] Wang Yue-fei; Artificial Societies, Computational Experiments, Parallel System—Discussion on Computation of Complex Social and Economic System [J]; Complex Systems and Complexity Science; 2004,1(4):25-35
[2] Wang Yue-fei; Computational Experiments for Behavior Analysis and Decision Evaluation of Complex Systems [J]; Journal of System Simulation; 2004,16(5):893-897
Applied Mechanics and Materials. 2013, Vols.380-384: 2387-2390

Recently, bone substitution materials provide new idea and methods for maxillofacial restoration and reconstruction.
We list the material elastic parameters of the soft tissue in Table 2.
International Journal of Oral & Maxillofacial Surgery, 2000, 29(1), pp. 2-10
International Journal of Oral and Maxillofacial Surgery, 2000, 29(1), pp. 11-17
Journal of Biomedical Engineering, 2008, 2, pp. 429-434