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Acknowlegement This work is supported by the National Natural Science Foundation of P.
Xu, Giant magnetostrictive actuators for active vibration control, Smart Materials and Structures, 2004, 13(3):473-447
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Pottmann, Gray-box identification of block-oriented nonlinear models, Journal of Process Control, 2000, 10(4):301–315.

The eventual size of about 100nm granular cementite and ferrite grain size on average of about 0.3 μm of fine grained materials had got.
Ma: Journal of Anhui Institute of Mechanical and Electrical Engineering, Vol. 14 (1999) No.4, p.10.
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Test materials are shown in the following table1.
When did not add the solid lubricant BaF2-CaF2, Ti-Al matrix materials average friction factor is 0.44; Adding mass fraction respectively, 5, 8, 10, 12, 15%, the order of materials and the average friction coefficient is 0.40, 0.37, 0.36, 0.37, 0.36.
Materials & Design, 2014, (54): 814-819
Journal of the European Ceramic Society, 2013, 33(1): 51-59
Powder Metallurgy Friction Materials [M].

Koerner presented a method based on the friction forces transmitted between the materials.
Fig.1 Configuration of model waste landfill Materials and Testing Procedure Materials.
The interfaces between different materials are modeled by joint element to simulate the transfer of frictional stresses through them.
The HDPE geomembrane and non-woven geotextile are treated as a linear elastic materials and secant modulus at a strain of 1% (Table 1) is applied in the analysis.
· The relative displacement value between materials must be considered when calculating the tensile forces of geotextile and geomembrane used on the slope of a waste landfill

Also, the cost of the products is lower in mass production due to the lower cost of the raw materials and higher production rates of the casting process.
References [1] Charchi, A., Rezaei, M., Hossainpour, S., Shayegh, J., Falak, S., Journal of Materials Processing Technology, 210(2010), pp: 2071-2080
Taghaddos, Materials and Design 30(2009),pp:1085-1092
Key Engineering Materials, 416 (2009), pp:455-460
[8] Yichao, S., Yibo, L., Qinsheng, W., DiamondTools and Metallography Basis, Building Materials Industry Press, China, Beijing ,1999.

The bonding material can hold the abrasive particles.
The main bonding materials are vitrified bond, synthetic resin and rubber bond [2].
The practical theorem is soft material has to be manufactured by much harder grinding wheel than tough material [1-4].
The section of the separated material is Aw=ap∙ae
Kala: Sustainable techniques in grinding: State of the art review, Journal of Cleaner Production, Volume 269, 2020, https://doi.org/10.1016/j.jclepro.2020.121876

Material parameters and calculation schemes In the paper, the spiral case structure of the hydropower station is seen as research background.
The steel liner thickness values of different schemes are listed in table 1 and material parameters are provided in table 2.
Table 1 Thickness values of steel liner in different schemes (mm) Scheme Section Numbers 1-3 4 5 6 7 8-9 10 11 12 13 14 15 16-22 Scheme 1 50 48 46 44 42 40 38 36 34 32 30 28 26 Scheme 2 48 46 44 42 40 38 36 34 32 30 29 27 25 Scheme 3 45 44 42 40 38 36 35 33 31 29 27 26 24 Scheme 4 40 39 37 36 34 32 31 29 28 26 24 23 21 Scheme 5 35 34 33 31 30 28 27 26 24 23 21 20 19 Table 2 Material parameters Material Unit weight （KN/m3） Elastic modulus (N/mm2) Poisson's ratio Designed tensile strength（MPa） Concrete 25 2.90e4 0.167 1.3 Steel liner 78.5 2.10e5 0.3 310 Reinforcement 78.5 2.00e5 0.3 310 3-D finite element model In combination with the practice of the spiral case structure, the three-dimensional finite element integral model is established including the spiral case, the surrounding concrete, stay ring and machine pier and so on.
Acknowledgements The research presented above is supported by the Outstanding Youth Talent Project of Education Department of Hubei Province (No.Q20101208) and the Science Funds of Three Gorges University (No.0620070006).
References [1] Qiling Zhang, Hegao Wu: Journal of basic science and engineering, Vol. 17(4) (2009), p. 536 (In Chinese) [2] Hegao Wu, Shanding Ma, Jizhang Qin: Design theory and engineering practice on spiral case of large hydropower station (Science Press, Beijing 2009) (In Chinese) [3] Hailin Wu, Hegao Wu, Congbao Wang: Journal of Huazhong university of science and technology (Nature Science Edition), Vol. 34(4) (2006), p. 99 (In Chinese) [4] SL/T 191-96, Design Specification for Hydraulic Concrete Structures.

Volz1,c 1Department of Civil, Architectural & Environmental Engineering, Missouri University of Science and Technology, Rolla, Missouri, USA 2U.S.
The first method is material-based and relies on higher paste contents, higher fines contents, and the use of smaller, rounded aggregates.
B. et al, “Shear Strength of a Lightweight Self-Consolidating Concrete Bridge Girder,” ASCE Journal of Bridge Engineering, V. 15, No. 5, September 1, 2010, pp. 615-618
[13] Taylor, H.P.J., “Shear Strength of Large Beams,” ASCE Journal of the Structural Division, V. 98, No.
S., and Marx, S., “Shear Database for Reinforced Concrete Members without Shear Reinforcement,” ACI Structural Journal, V. 100, No. 2, March-April 2003, pp. 240-249.

Materials and Methods Sampling Method.
Various studies [17,18] showed that natural bentonite had a higher adsorption capacity than that of different materials, such as kaolinite or lignite.
However, the study gives hope for the use of low-cost, locally available material for removing excess fluoride from drinking water, especially in arid areas of developing countries.
Arab: Journal of Nuclear and Radiochemical Sciences, Vol.8, No.1 (2007), p.31
Journal Env.

This issue is widespread and affects production technology, materials science and more.
It depends on the specific materials and on the design of the motor.
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