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For some type of rolling element bearings such as cylindrical roller bearings, tapered roller bearings, needle bearings and so on. m, J and even the included angle β between the rotation axis which was named as u axis and the axis in orthogonal coordinate system such as Oxyz and O 'x -'y 'z' coordinate systems can be calculated according to methods in mechanics of materials.
Acknowledgments The research in this paper is supported by National Natural Science Fund (50705096) .
[4] C E Sunnersjo: submitted to Journal of Sound and Vibration(1978)
[6] J Perret-liaudet, E Rigaud: submitted to Journal of Sound and Vibration (2003)
[8] M Tiwari, K Gupta, O Prakash: submitted to Journal of Sound and Vibration(2000).

Moreover, pH-responsive materials could, in principle, be used to selectively release their contents in regions of the body where the pH is lower than physiological due to pathological conditions (e.g. tumours, inflammation or infection sites)[20].
Experimental Materials.
Science 1980, 210, (4475), 1253-1254
Chemistry-a European Journal 2002, 8, (13), 2838-2846
Science 1995, 269, (5227), 1080-1083

Asphalt mixture is one of the most extensively applied and most dosage road materials.
The complexity of its composing materials ,the universality of projects usage and the particularity of macroscopic and microscopic structures, determined that research on asphalt mixture should improve itself with the help of the cross of the latest research results .Fractal theory is a newly arisen boundary science ,which gives quantitative description of the complex degree of geometric figure and the ability of space filling[4].To many concave convex, crushing and rough shapes which usually appearred in material science experiment, traditional geometric language has much difficult, but fractal theory makes up for its deficiency by revealing scale-free nature(self-similarity),and offers a quantitative description of the complex geometric shapes in nature[5].
As a nonlinear science on the rise, fractal theory and its application are continuously improved.
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Vol.15(1987), p.218 [2] Sunxia ,Wu ziqin and Huangyun., Principe and Application of Fractal Hefei fromUniversity of Science and Technology of China Press,2003 (In Chinese) [3]Fengrui , Shi Changxu, Liu Zhiguo : Introduction to Material Science,Beijing, from,Chemistry Industry Press,2002.4-6 (In Chinese) [4]Ideal fractal : physical ,from Long Qiyi ,Long Qiwei ,Mu Zaiqin,(1994), p.158-164 [5]Evaluation of topologic and fractal characteristics of concrete[J] from Tangming, Ba Hengjing,Journal of HarbinUniversity of Civil Engineering and Architecture(2002),p.86-89 (In Chinese) [6] Fractal Zeng Wenqu :Theory and Fractal Computer Simulation.

[6] Duaa muthana, Alaa Nazar Abd Algaffar, Abdullah Ibrahim Abbo Al-Numan, Design and Evaluation of a Polarizer Filter, Baghdad Science Journal, 2018, (15), 287-291
Journal of the Physical Society of Japan 86.12 (2017): 124721
In EPJ Web of Conferences, EDP Sciences, 162 (2017) 01008
EDP Sciences, 2017
EDP Sciences, 2017

New Trends in Materials Science Experimental researches have been done to determine the optimal volume content of fibers ‘μ’ for fine-grained reinforced concrete.
Advanced Materials Research: International Conference on Manufacturing Science and Technology (ICMST 2011), 383–390(2012), 4560–4567
ASCE Journal of Materials in Civil Engineering. 12 4 (2000), 314–319
Advanced Materials Research.
Materials Science Forum.

The use of edible food materials brings about a food-fuel crises and ethical issues about food security [17].
There are great concerns that the use of edible vegetable oils and animal fats for biodiesel production is not feasible because they are more expensive and compete with food materials in the long-term.
In light of this, research focus must be intensified to seek oil bearing plants that can be used as raw materials for biodiesel production.
The Journal of Agricultural Science. doi:10.1017/s0021859609008624
Journal of Agricultural Engineering Technology (JAET) 23 (2): 26–36

The equipment has three driving units, fitted with electric motors: the driving unit no.1 (0.75 kW), provides a vertical movement of the FSW tool, the penetration speed of the pin tool in the materials, and the pressure of the tool shoulder on materials, after the following operating procedure: - descending of welding tool – contact between the pin tool and welding materials; - penetration of the pin tool on welding materials; - pressing of tool shoulder on the welding material surfaces; - the welding process ( the driving unit no. 1 is not working);- removal of the welding tool form the weld material.
In this point the tool shoulder is in contact with materials which need to be welded.
The result of FSW welded of AA2124/SiC/25%p-T4 metal matrix composite plates have shown that these materials can be welded by this process even at high tool transverse speed.
Yigit, Influence of Welding Parameters on the Fatique Behaviours of Friction Stir Welds of 3003-O Aluminium Alloys, Material Science, 16 (2010) 311-319
Bozkurt, Weldability of Metal Matrix Composite Plates by Friction Stir Welding at Low welding parameters, Materials and Technology, 45 (2011) 407-412

These materials are known as the nano-composites.
Electromagnetic processing of materials applies electromagnetic field into materials fabrication and processing to control materials structure and properties.
Sajjadi, Materials and Design 28 (7) (2007) 2113–2120
Li, Journal of Manufacturing Science and Engineering, Vol.129,(2007).497-501 [26] Y.
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Materials and methods Study area Mengcha village is located between 110°6′E–110°9′E and 37°45′–37°47′N.
Acknowledgments This work was supported by the National Natural Science Foundation of China (41271103) and Doctor Degree Foundation of Xi’an University of Science and Technology (2012QDJ029).
Ren: Agricultural Sciences in China Vol. 8 (2009), p. 91-97
Gao, et al.: Journal of Natural Resources Vol. 23 (2008), p. 345-352 (in Chinese with English abstract)
Angel: The Journal of Socio-Economics Vol. 36 (2007), p. 311-329

It is very important to understand the process mechanism and its compatibility with various dissimilar materials joining.
Different filler materials were applied for the dissimilar joints between ferrous and non-ferrous materials.
(eds) Advanced Materials.
Materials Science and Engineering A 509 (2009) 31–40
The Minerals, Metals & Materials Series.