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Thus the contact heat transfer coefficient between materials and kiln wall is: (10) Convective heat transfer coefficient between covered wall and materials  In the completely mixed case, the thermal convection among particles caused by relative motion can be ignored.
(12) Where, ，τc is the contact time of materials and kiln wall, which is equal to the time particle passes the plug layer.
For it is quiet for materials relative to kiln wall, so τc=2φ/ω, φ is half of the filled angle of materials, ω is the rotating speed of kiln.
International Journal of Heat and Mass Transfer，39(1996) 2131-2147 [4] Schlunder E U.
Chemical Engineering Science, 51(1996) 1-26 [6] Tscheng S H, Watkinson A P.

Material nonlinearity, especially in hyperelastic materials, amplifies frictional sliding and hysteresis.
Cell Reports Physical Science, 4(3)
International Journal of Mechanical Sciences, 267, 108982
Materials & Design, 121, 414-420
"Adhesive contact mechanics of viscoelastic materials." 

Research on Ultrasonic Vibration Combined with Grinding Machining and its Application in Processing Brittle Hard Materials Yongjun Zhang 1,a , Yongjun Tang1,b and Xiaokang Liu2,c 1 Faculty of Electromechanical Engineering, Guangdong University of Technology, China 2 School of Mechanical & Automotive Engineering, South China University of Technology, China a yjzhang@gdut.edu.cn, b yjtang@gdut.edu.cn, cliuxk58@scut.edu.cn Keywords: Ultrasonic vibration, grinding machining, brittle hard materials, high removal rate Abstract.
Introduction Brittle hard materials of optical glass, function ceramics, hard alloy and so on have been applied in wide fields of modern industrial, but their process-ability are poor owing to high temperature resistant, good resistance to abrasion and chemical stability[1-5].
Acknowledgements This research was funded by Guangdong-Hong Kong's Key Areas Important Breakthrough Project (2006A15101004), Guangdong Key Project of Science and Technology (2007B010400051), Guangzhou Key Project of Science and Technology (2009Z2-D611), Panyu Key Project of Science and Technology (2008-Z-43-1).
Materials Science Forum, 2007,v.532-533:361-4 [6] Hocheng H, Kuo K L.
International Journal of Machine Tools & Manufacture, 2002,42:7-13 [7] Rajurkar K P, Wang Z Y, Kuppattan A.

Effects of surface density on the material It can be seen from Figure 2, in the case of the same thickness, in a low-frequency sound, the absorption curves of the three materials are almost coincidence, indicating that the absorption capacity of the three kinds of materials to low-frequency sound waves is basically the same and in the low-frequency sound absorption sequel is poorer, which is consistent with the law that the absorption of porous materials to low-frequency sound is poor, and justify the effect of changing the size of material surface bulk density on low-frequency sound absorption performance is not obvious.
From the above analysis we can see, increase in material density can increase the absorption properties of materials, but its effect on low frequency sound absorption is not obvious, it can primarily improve the absorption capacity of materials in the section of high-frequency sound.
Such as: this article only conducts three kinds of combinations of different density material, in the future we can combine with more different materials of different density in different ways, in order to identify the best combination ratio.
References [1] Pele C E, Nonwovens Make Themselves at Home, NonwovensIndustry,2000,(2),3 [2] Youn Eung Lee and Chang Whan Joo, Sound Absorption Properties Of Recycled Polyester Fibrous Assembly Absorbers, AUTEX Research Journal,3(2), 2003 [3] T.
Adachi, The Development Of Sound Absorbing Materials Using Natural Bamboo Fibers, High Performance Structure And Composites Book, WIT Press 2002 [4] Kannan Allampalayam Jayaraman，Acoustical Absorptive Properties of Nonwovens，A thesis submitted to The Graduate Faculty of North Carolina State University in partial fulfillment of the requirements for the Degree of Master of Science，2005 [5] Kyoichi Watanabe, Yoshiaki Minemura, Kouichi Nemoto and Hiroshi Sugawara, Development Of High Performance All Polyester Sound Absorbing Materials, JSAE Review 20, 1999, 357--362显示对应的拉丁字符的拼音   字典 1.

Summary Composite material pressure vessels are the important application of composite materials in pressure vessels, and it will be developed with the improved of composite materials.
The break through of pressure vessel materials will have a significance to the entire pressure vessel technology[13].
Meng: Journal of Chiferg College.
Tian: The boundary element method of composite materials.
(Science Press, Beijing 1996)

Material value conservation as an effort to maintain the residual value of plastic materials.
Due to the increasing number of recycled plastic materials and the long plastic materials life cycle, the continuous use of recycled plastic materials can minimize the need for virgin plastic materials [24] and further reduce the problem of environmental from plastic waste.
Iacovidou, An overview of the challenges and trade-offs in closing the loop of post-consumer plastic waste (PCPW): Focus on recycling, Journal of Hazardous Materials, Vol. 344 (2018) 179-199
Kamaruddin, Optimization of Mechanical Properties of Recycled Plastic Products via Optimal Processing Parameters Using the Taguchi Method, Journal of Materials Processing Technology, Vol. 12 (2011) 211 [14] S.
Textbook of Polymer Science.

Unqualified Materials.
Statistics suggested the cost of materials accounts for 70% or more in the total investment [3].
Guarantee the Quality of Building Materials.
It is an effective measure conducting necessary tests for materials to guarantee the quality of building materials.
Causes and control strategies of engineering quality accident, Journal of Yangzte University (Natural Science Edition), 3 (2006) 100-101.

However, just as material engineering science has been possessed of the vast advancements, such as anti- wearing and anti-stress and heat-resisting for material properties and their preparation technology levels were substantially raised up, thus, today material life was also substantially extended[3].
Furthermore，it was indeed pointed that these basic statistical analysis combined closely with surface analysis on the friction materials is the better mode, thus, the more profound analysis might be achieved especially in the effects of the accelerated life testing.
Moreover, in fact, the forthright and functional judging method was given in certain extent for the accelerated testing designed by this paper; (2) Through the life curve analysis, it was showed under three kinds of stresses that life law of the testing materials was primarily consistent according to life distribution.
Journal of Mechanical Engineering ,,2009,45(8): 130~136
Chinese Journal of Simiconductors, 2006,27(3):560~563

Dynamic Triaxial Test Tested Materials and Apparatus The rock-fill materials were furnished by construction organization from a face rock-fill dam in West China.
Table 1 Physical properties of rock-fill materials Sample type(NO.)
One thing to be mentioned is that rock-fill materials are seen as granular materials, and the structure and characteristics are different from those solid materials in Mechanics of Materials.
Different from solid materials, the properties of granular materials are studied under confining pressure, and the properties of the materials are affected by confining pressure.
International Journal of Rock Mechanics & Mining Sciences, 2007(44): p. 1-13

The thickness of the mixed layer of Al and Mg alloy was 15μm, and how the materials were connected was clarified.
Connection between the three materials was insufficient in this case.
Davey, Feasibility study of twin roll casting process for magnesium alloys, Journal of Materials Processing Technology, Vol. 192-193(2007), pp.300-305
Koga, Development of manufacturing process of wrought magnesium alloy sheets by twin roll casting, Journal of Achievements in Materials and Manufacturing Engineering, Vol. 20, Issues 1-2(2007), pp.515-518
Randle, Formation of intermetallic phases in diffusion-welded joints of aluminium and magnesium alloys, Journal of Materials Science, Volume 46(2011), Issue 2, pp 357-364.