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Journal of Shanghai Jiaotong University.2002, 36(11): 1612-1615
Journal of Aerospace Power, 2004, 19(4):550-556
Journal of Aerospace Power, 2006, 21(5):930- 936
Journal of National University of Defense Technology, 1999, 21(2):14-16
Journal of Aerospace Power, 2009, 24(12):2649-2654

Manganites or manganese-based oxide materials have been known since the early 1950s [2].
The most fundamental properties of these materials are a strong correlation between its structure, transport, and magnetic properties.
Praseodymium (III, IV) Oxide (Pr6O11, 99.9 %), Strontium Carbonate (SrCO3, 99.9 %) and Manganese (IV) Oxide (MnO2, 99.9 %) were used as the starting materials.
Kurchania, Structural, magnetic and transport properties of the La0. 7Sr0. 3MnO3-ZnO nanocomposites, Journal of Magnetism and Magnetic Materials, 448 (2018) 228-235
Phuc, Magneto-transport and magnetic properties of (1–x)La0.7Ca0.3MnO3+xAl2O3 composites, Journal of Magnetism and Magnetic Materials, 323 (2011) 179-184

Introduction The fabrication of nanometer-sized materials has attracted considerable attention for their potential uses in both mesoscopic research and the development of nano-devices.
GaN materials with low-dimensional structures have been fabricated using various methods, such as laser-assisted catalyst, using carbon nano-tubes as templates, metal and metal-oxide nano sized particle catalysts (ex.
R01-2006-000-10352-0 from the Basic Research Program of the Korea Science & Engineering Foundation.
Journal of Crystal Growth 273 (2005) 375-380
Ohtani Optical Materials 27 (2005) 799-803

Ultrahigh strength steels are often regarded as difficult-to-machine materials because of their low thermal conductivity, high toughness, high hardness and strength and severe work hardening.
Krajnik: Journal of Materials Processing Technology 175 (2006) 278-284
Karabin, in: Proceedings of the Sixth European Conference on Residual Stresses, Materials Science Forum, 2002, pp. 61-68
[4] Jiang Hua, Domenico Umbrello, Rajiv Shivpuri: Journal of Materials Processing Technology 171 (2006) 180-187
M'Saoubi: International Journal of Machine Tools & Manufacture 46 (2006) 1786-1794

Materials and Methods Experimental object.
Journal of Sun Yatsen University (Science edition), 2007, 46(3): 134-136(In Chinese) [8] Y.
Journal of Soils and Sediments, 10(7): 1427-1433
Journal of Environmental Management, 92(6): 1577-1583
Journal of East China Normal Unversity(Science edition), 2011(1): 163-171.

Acknowledgements This work was financially supported by the Natural Science Research Projects of Hebei Institution of Higher Learning (Z2010107).
Journal of Hebei Normal University (Natural Science Edition), 2011, 35 (6):602-604.
Journal of Hebei Normal University (Natural Science Edition), 2002,22 (1):19-22.
Journal of Maoming University, 2008,18(6):28-29.
Journal of Foshan University (Natural Science Edition), 2000,18 (4):47-49.

Table 1 The physical and mechanical indices of surrounding and supporting material E [GPa] μ γ[KN/m3] [°] C[MPa] Grade IV rock 6 0.32 20 30 0.60 C25shotcrete 25 0.25 23 C25reinfoced concrete 30 0.20 25 Φ22 rock bolt 190 0.3 79 Finite element model shows in fig.6.
[3] Zhida,Li,Liu Jinyong, Reasearch on Stability for Surrounding Rock of the Tunnel Supported by Bolt-shotcrete, Nature Science journal of Xiangtan University,2005.9(In Chinese)
[4] Zhida Li, Qiang Huang: Field Monitor of Surrounding Stress and Rheological Analysis in Tunnel Construction, Journal of Wuhan university of technology (transportation science &engineering), (2010.3) p. 129–133, in Chinese
[5] Qiang Huang, Zhida Li, Yanzhen Wu: Analysis on Surrounding Rock Stress in shallow-buried bias Tunnel, Natural Science Journal of Xiangtan University, 2010(1);25-29(In Chinese)
[6] Tingqing Yang: Viscoelastic theory and application, Science Press, Beijing. (2004) (In Chinese).

Ishihihara3 1 Department of Materials and Foundry Technology, Hanoi University of Science and Technology, Vietnam.
Van de Voorde; Materials for High temperature engineering applications, Springer (2000), p25
Enayati; Synthesis and characterization of TiAl/Al2O3 nanocomposite by mechanical alloying, Journal of Alloys and Compound (2009) 257-259
Welham; Mechanical activation of the solid-state reaction between Al and TiO2, materials Science and Engineering, (1998), 81-89
[5] Carl Koch; Nanostructure Science and Technology, Kluwer Academic Publishers (1999) [6] Tran Duc Huy, Nurulakmal Mohd Sharif, Zuhailawati Hussain, Keiichi N.

Materials and methods Materials The hemp fabric was purchased from “Chanvre Naturel” (natural hemp), Europe.
Piorkowska : Composites science and technology Vol. 66(2006), p. 2218
[4] Hongchang HAN, X.Lu GONG: Applied mechanics and materials Vol. 470(2014), p. 23
[5] Moyeenuddin A Sawpan, Kim L Pickering and Alan Fernyhough: Journal of composite materials Vol.47(2012), p. 1513
Sadiku: Journal of Reinforced Plastics and Composites Vol. 27(2008), p. 1533

The stern shaft mechanical seal materials and boundary conditions setting The stern shaft mechanical seal materials.Floating ring (static ring and the bracket) using M106H graphite impregnated with epoxy resin embedding CESTIDUR (polyethylene, polyamide, poly synthetic materials formaldehyde resin), namely the friction face is CESTIDUR material; static ring bracket adopts M106H graphite; ring adopts 3Cr13 stainless steel.The structure parameters and property parameters of bracket and static, moving ring as listed in Table 1.
Acknowledgements This research is supported by the National Natural Science Foundation of China (No.51079119) , key National Natural Science Foundation (No.51139005)and Research on the key technology of ship repair integrated digital information platform system(2011B090400448) References [1] Xuefeng Ma.
Calculation of Mechanical Engineering Society of Heilongjiang province. 2002 journal, design of mechanical seal of Heilongjiang: Heilongjiang Institute of mechanical engineering, 2002:242-246
Khonsari.Numerical Simulations of the Flow Field Aroud the Rings of Mechanical Seals [J].Journal of Tribology;2006,128(7),559-565
Beijing University of Science and Technology,China,2001