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Calcination of natural materials (which posses calcium phosphates) at high temperatures (850°C) [3-4] is another interesting method.
Materials and Methods The shells of Zebra Nerite Snail were used (Fig. 1).
Processed HA materials were sintered at 865 and 885 0C in air around 4 hours.
This process can be simple and economical in producing biomedical scaffold materials.
Palti, ß-Tricalcium Phosphate as Bone Substitute Material: Properties and Clinical Applications, The International Journal of Dental Implants & Biomaterials, 2-11, Titanium, 2009 1(2): 0-0.

The former one uses time-of-flight (TOF) of plane wave propagating in bolt, while the latter uses surface acoustic wave (SAW) traveling on the material surface.
The mode-converted ultrasound has abundant information about the bulky material property, even though it is not well known yet in quantitative way.
In the table, experimental results are listed together with bulk elastic constants from material database for comparison.
Hing : Journal of Materials Science, Vol. 32(1997), pp. 6633-6638
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Sharma: Materials Science and Engineering A Vol. 420(2006) ,p.228 [2] Z.
Liu: Rare Metal Materials and Engineering Vol.37(2008) ,p.1898 [3] Z.
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Thus, the investigation on lightweight materials aimed at the knowledge acquisition becomes of dramatic importance.
Gupta: Material science and engineering A Vol. 425 (2006), p. 22-27
Gabrielli : Key Engineering Materials Vol. 344 (2007), p. 55-62
Fatehi-Sichani: Journal of Materials Processing Technology Vol. 177 (2006), p. 478–482 [11] C.M.
Chen: Materials letters Vol. 62 (2008), p. 1129-1131

Materials and Methods Materials.
Forest Products Journal, 2010, 60(7): 668-678.
Construction and Building Materials, 2012,27: 60-65
Development of Fire-Retarded Materials—Interpretation of Cone Calorimeter Data [J].
Fire and Materials, 2007, 31: 327–354.

Su: Materials Letters Vol. 56 (2002), p. 763
Naz: Journal Of Materials Engineering and Performance Vol. 19 (2) (2010), p. 264
Sitarama: Materials Science and Technology Vol. 26 (12) (2010), p. 1459
Kong: Materials & Design Vol. 28 (4) (2007), p. 1231
Kaluc: Materials Characterization Vol. 59 (2008), p. 351

Acknowledgement This work was supported by Humanistic and Social Science Foundation Funded Project from Ministry of Education of the People’s Republic of China (10YJA630032) References [1]　X.
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Table3 The velocity and the effect range for different section shape Analysis case Deep(D)or shallow (S) tunnel Ratio (height/ span) The maximum velocity (unit: m/s) The effect range along longitude axis (unit: m) Vault Wall Foot Case 1 D 0.54 0.16 1.51 0.82 18 Case 2 D 0.74 0.23 0.98 0.56 14 Case 3 D 1.00 0.90 1.82 0.80 18 Case 4 D 1.30 0.36 2.47 0.97 18 Case 5 S 0.54 0.16 1.55 0.80 18 Because the vibration velocity in the material determines the stress value, it can be seen from Table3 that the larger the ratio of the height to span of the tunnel, the more sensitive the response of the vicinal tunnel lining to the blasting load; the curvilinear wall is favorable to resist the dynamic wave caused by blasting load; the deep tunnel and the small span tunnel will be more stability than the shallow tunnel and the large span tunnel.
[14] Li, F., Chen, W., Li, S., Li, T.: Chinese Journal of Rock Mechanics and Engineering, Volume 23, Issue SUPPL. 2, July 2004, pp. 4744-4748
-L., Tong, P.: Journal of PLA University of Science and Technology (Natural Science Edition), Volume 8, Issue 6, December 2007, pp. 702-708
[17] Gong, J., Xia, C., Zheng, Z., Tang, Y.: Chinese Journal of Rock Mechanics and Engineering Volume 26, Issue 9, September 2007, pp. 1882-1887

In this study, the cover and core concrete material were defined separately using the model concrete01 based on modified Kent-park stress-strain relationships [3] as shown in Fig 2,where fcc and fc0 are compressive strength of confined and unconfined concrete, and ecc and e0 are corresponding strain for confined and unconfined concrete, respectively.
Acknowledgements The authors appreciate the support of Science and Technology Planning Project (K1109018-11) of Changsha City and Science and Technology Planning Project (S2012F1023) of Hunan Province, China.
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Participants involving athletes, spectators and media have paid large attention to the problem for small work suits accompanied with the rising level of the clothes rejection number and increase of material consumption.
Computer and Information Science.
Vol. 37, Iss. 3; p. 48-54 [3]Lee M KO,Turban E,A Trust Model for Consumer Internet Shopping.International Journal of Electronic Commerce.2001(6),p.33-35 [4]Characteristics of Effective Simulated Clinical Experience Instructors: Interviews with Undergraduate Nursing Students Bridget Parsh.
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Vafeiadis, Thanasis,International Journal of Business & Social Science, 2011, Vol. 2 Issue 8, p.226-233 [8]A Retrieve Space Principal Component Analysis Based on the Image Retrieve Principle.Zhi-bo Guo; Yun-yang Yan; Pattern Recognition, 2009.