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Besides, the characteristics of materials themselves also have a considerable influence on screening efficiency.
The significant influencing factors of the materials are the relatively geometric dimension of the particles and of the hole of the screen.
Yunnan Agricultural Science and Technology, 2002,02:13-16.
Journal of Agricultural Mechanization Research, 2009,09:117-119.
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Methods and materials.
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Wong: Materials Research Bulletin, Vol.35(2000),P.1555 [8] J.L.
Hu:Journal of Materials Processing Technology, Vol.187–188 (2007),P.614 [9] H.H.

There are always some micro-defects such as micro-cracks in tap materials, and furthermore, the tap bears impact load in vibration tapping.
Ai: Journal of Shandong University (Engineering Science), Vol. 20 (1984), pp. 1-7.
Ai: Journal of Shandong University (Engineering Science), Vol. 19 (1983), pp. 77-8.
Xiao: Journal of Shandong University (Engineering Science), Vol. 20 (1984), pp. 9-17.
Lin: Journal of Materials Processing Technology, Vol. 108 (2000), pp. 12-20

It has been applied to a number of processes from turning, drilling to grinding and polishing, which has shown the advantage of machining some hard and crisp materials [1, 2].
According the recent study, the assisted ultrasonic vibration in the abrasive polishing processes has been developed from one direction vibration to two-axis flexural vibration, which can improve the MRR of many hard and brittle materials like sapphire, silicon and micro-aspheric molds.
Journal of Refractory Metals and Hard Materials, 29 (2011), p. 68 [5] Saeed Mirian, Mohsen Safavi, Alireza Fadaei, Mahmoud Salimi and Mahmoud Farzin: International Journal of Precision Engineering and Manufacturing, Vol. 12(2011) No.2 , p. 275 [6] Shaohui Yin, Takeo Shinmura: International Journal of Machine Tools & Manufacture, 44 (2004), p. 383 [7] Shaohui Yin, Takeo Shinmura: International Journal of Machine Tools & Manufacture, 44 (2004), p. 1297 [8] Wenhu Xu, Xinchun Lu, Guoshun Pan, Yuanzhong Lei and Jianbin Luo: Applied Surface Science, 256 (2010), p. 3936–3940 [9] Wenhu Xu, Xinchun Lu, Guoshun Pan, Yuanzhong Lei and Jianbin Luo: Applied Surface Science, 257 (2011), p. 2905–2911 [10] H.
Sato: Journal of materials processing technology, 201(2008), p. 531 [13] Javad Akbari, Hassan Borzoie and Mohammad Hossein Mamduhi: World Academy of Science, Engineering and Technology, (41) 2008, p.785 [14] Yan Yanyan, Zhao Bo and Liu Junli: Int J Adv Manuf Technol, (43) 2009, p.462 [15] G.F.
Kong: Journal of materials processing technology, 209(2009), p. 32 [16] Y.

Silty clay was used as sub grade material.
Materials which are used to make fibers for reinforcement may be obtained from paper, metal, nylon, polyester and other materials having widely varied physical properties.
MATERIAL Composite materials consist of two parts.
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[5] Chegenizadeh, A. and Prof.Hamid Nikraz ,”Composite Soil: Fibre Inclusion and Strength”, Journal of Advanced Materials Research,1646, 2011, Journal in press [6] Chegenizadeh, A. and Hamid Nikraz ,Interaction of soil and short fibre, , ASTM digital library,2011,In press [7] Chegenizadeh, A. and Hamid Nikraz, Composite Clayey Sand and Short Fibre, Advanced Materials Research Journal, In press [8] Freitag, D.R. (1986) Soil randomly reinforced with fibers, Journal of Geotechnical Engineering ASCE 112 (8), pp. 823–826

So, in larger sense, WPC essentially has become a new class of composite materials with different types of plant fiber materials as the reinforced materials, and different kinds of plastics as the matrix material.
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Acknowledgements This work was financially supported in part by the Natural Science Foundation of China (51278373), and the Natural Science Foundation of Liaoning Province (201202180), as well as the Science Foundation of Liaoning Education Department (L2012214).
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Kaczmarek: Journal of Composite Materials, Vol.37-3 (2003), p.987.

Several studies have been performed for machining of hard and brittle materials using ultrasonic vibration, which applied on either work material or cutting spindle2,6,7.
Ho11 Journal of Materials Processing Technology Vol. 62 (1996) pp.287-293
Kim, Journal of Materials Processing Technology Vol. 191 (2007) pp.153-156
Kong, Journal of materials processing technology Vol. 209 (2009) pp.32-37
Khamba, Materials Science and Engineering A460-461 (2007) pp.365-369

To reduce this impact, materials that are more environmentally friendly are used.
Several types of substitute materials have been offered.
Among these materials are silica fume and liquid carbon dioxide.
However, literature comparing the two materials is not available.
Simulations were carried out on two different types of concrete mix materials to see the effectiveness and the best materials for high-rise building structures.

Construction of sports facilities in one hand to adopt environmentally beneficial new technologies and take full advantage of renewable materials.
Such as construction of stadiums location problem, the use of building materials and deal with the problem, urban environmental problems, including air pollution, water pollution, noise pollution.
Acknowledgements This work was financially supported by the National Social Sciences Funding of China(14CTY010), China Postdoctoral Science Foundation (2014M552060) and The Research Center of Hubei Province Sports Industry (Csir2013-004).
Journal of Physical Education, 2014, 21（1）:57-60
Journal of Tianjin Sport University, 2005, 5: 1-4.