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Introduction As the exploitable utilizable forest stock is lessen, there is great change in the forest resource structure of our country, and the situation so-called “ three more three less ” is happened: less Virgin forest, more plantation; Less big diameter grade timber, more small diameter grade timbers; less precious, high quality and rigid materials, but more fast-growing, inferiority, soft materials.
Test materials are Poplar LVL (Hebei SANLI Wood Products), whose thickness of veneer is about 1.6mm, 21 layers.
Wood Science and Technology,2001(35): 852961 [3] Robrt J, Ross, Brian K.etal.
Nondestructive Evaluation of Wood[J]．Forest Product Journal,1998, 48(4):14-19 [4] Brent A.Richburg, Donald A.
Wood and Fiber Science[J].1992,24(2):225-232 [5] Olivito.R Ultrasonic measurements in wood[J].

China 2 Key Laboratory of Display Materials & Photoelectric Devices, Ministry of Education, School of Materials Science and Engineering, Tianjin University of Technology, South Hongqi Road Extended Line, Nankai District, Tianjin 300384, P.
* Corresponding Author: Xiao Yu Zhou, Key Laboratory of Display Materials & Photoelectric Devices (Tianjin University of Technology), Ministry of Education, School of Materials Science and Engineering, Tianjin University of Technology, South Hongqi Road Extended Line, Nankai District, Tianjin 300384, P.
For the reason of small size and thin material, diskspring manufacturers might not make any prestressing treatment.
[2] Stress Relaxation and Prevention of Springs (Materials), edited by Deda Su, Tianjin University Press publishes, Tianjin, china (2002), in Chinese
[5] Bohua zhao: Conversion Relations Between relaxation and Creep, Journal of Experimental Mechanics vol. 10, No. 2 (1995), p. 140, in Chinese

Among the various composite nanomaterials, ZnTiO3 doped with some transition metal ions has been widely researched as one of the most promising luminescent materials as a result of its environmental friendliness and low cost [2,3].
In the present paper, we attempt to prepare Pb2+ ions-doped ZnTiO3 nanofibers by using sol– gel processing and electrospinning method, and want to gain a kind of materials with improved photoluminescence properties due to one-dimensional nanostructural properties and high specific surface area.
Shepilov, Structural states of Ni(II) in glasses and glass-ceramic materials of the lithium-aluminium-silicate system, J.
T, Infrared-Absorption Studies on Barium Titanate and Related Materials, Phys.
Yang, Nanofibers of LiMn2O4 by electrospinning, Journal of Colloid and Interface Science 285 (2005) 163–166

Kukureka et al. [14] investigated the friction test between two same nonmetal materials.
Chandramohan and Siddaramaiah et al: Materials Science and Engineering A Vol. 443 (2007), p. 285 [9] N.
KumareshBabu: Materials and Design Vol. 32(2010), p. 1704 [10] N.
Rao et al: Tribology International Vol. 32(1999), p. 107 [15] Seong Jin Kim and Ho Jang: Tribology International Vol. 33(2000), p. 477 [16] Fang Guo, Zhaozhu Zhang and Huijuan Zhang et al: Journal of Applied Polymer Science, Vol. 111(2009), p. 2419 [17] B.
Wong: Materials and Design Vol. 31(2010), p. 4514 [18] B.

The distant between the diamond pipes must guarantee the materials free flowing from top to bottom by itself gravity.
According the theory and simulation computation, the distant between the diamond pipes should be bigger than 4d, where d is the max material diameter [3].
Zhang Z.J., Xu C.H., Zhang S.W., Tang X.J. and Zhao X.T.: Journal of Northeastern University (Natural Science) Vol. 29 (S2)(2008), p. 42 [4].

Materials for SC-1 are 304 stainless steel.
And the properties of the material are: E=1.97×105MPa, ν=0.3,ρ=7.85g/cm3.
Chinese Journal of Computational Mechanics, Vol.15, No.1, pp58-68, 1998 (In Chinese) [3] Dongxian Zhao, Wei Wang: Edge Stress Analysis Between Cylinder and Ellipsoid Head.
Ship Science and Technology, vol.33, No.9, pp7-10, 2011(In Chinese) [6] J.R.

There are many theoretical advantages in modifying biomaterial surfaces with the stepwise SSP including: modification of the oxide properties to investigate the relative influence of various physico-chemical features such as surface topography, composition, wettability and thickness; nanostructured multilayer organization of the oxide with biologically relevant molecules; and enhanced bioreactivity of the material.
Acknowledgements This work was supported by Korea Science and Engineering Foundation (KOSEF R01-2005-000-10617-0).
Matthew Donachie : Advanced Materials and Processes, (1998) [3].
B Byeon, Journal of Korean Ceramic Society, Vol. 34, No.1, pp 42. (1997) [5].

These fillers likewise diminish from the capacity to reuse scrap materials, expanding squander transfer costs.
ii) CNT-based films and strands For some applications, stringy materials are more appropriate than mass materials.
Kostopoulos (Eds.), Carbon Nanotube Enhanced Aerospace Composite Materials: A New Generation of Multifunctional Hybrid Structural Composites, Springer, Dordrecht, 2013
Sheldon, Fracture toughness of highly ordered carbon nanotube/alumina nanocomposites, Journal of Engineering Materials and Technology. 126(3) (2000) 238–244
Current Opinion in Colloid and Interface Science. 14 (2009) 364–371

Kumar: Nanoparticles in Cancer Imaging and Therapy, Journal of Nano Materials (2012) doi:10.1155/2012/891318 [198] M.
Patrick, Encyclopedia of Materials: Science and Technology, Elsevier, Oxford, 2001, pp. 6595-6601
Lemons, Biomaterials Science: An Introduction to Materials in Medicine, Academic Press, San Diego, 1996
Suryanarayanan (Eds.), Surface Engineering in Materials Science-II, TMS, Warrendale, PA, 2003
Li, Toxic potential of materials at the nanolevel, Science 311 (2006) 622-627

Titanium dioxide also known as titania is a ceramic material.
Introduction There is a growing interest in the application of nano materials with an average grain size (1-50 nm) since their physical, chemical, magnetic, electronic and optoelectronic properties are quite unique and different from their bulk micron sized structures.
For instance, TiO2 is a semiconductor material with a wide variety of applications ranging from catalysis, sensors, memory devices and solar cells to cosmetics [1-4].
Ismat, Journal of Nanoscience and Nanotechnology, Volume 8, Number 5, (2008), p. 2410 [3] Z.Ding, X.Hu, G.Q.Lu, P.L.Yue, P.F.Greenfield, Langmuir 16, (2000),p.6216 [4] A.
Ismat Shah, Materials Science and Engineering B MSB 9793(2004), p.1 [8] M.