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There have been several reports on RE-doped oxide transparent ceramic [4, 5] materials, however, there are rather few reports on RE-doped CaF2 transparent ceramic materials.
Table2 Judd-Ofelt parameters and 4I13/2 →4I15/2decay time in different host materials host material Ω2 (10-20cm2) Ω4 (10-20cm2) Ω6 (10-20cm2) τrad(ms) Ref.
Acknowledgement This work was financially supported by the National Natural Science Foundation of China (No. 51072144) and the Project for Science and Technology Plan of Wuhan City (No.201210231092).
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It is widely used as reinforcement phase for the preparation of high-performance composite materials, and has a great development value and a good application prospect [2, 3].
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Bobrovskiy Influence of Material Structure Crystallography on its Formability in Sheet Metal Forming Processes,  IOP Conference Series-Materials Science and Engineering. 286(1) (2018) 1-7.

[4] Gupta A., Tripathi G., Lahiri D., Balani K., Journal of Materials Science & Technology, 6 (29),2013, p.514
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Series: Materials Science and Engineering 302 (2018) 012041
Series: Materials Science and Engineering 302 (2018) 012066
Grechnikov, Effect of the yield criterion of matrix on the brittle fracture of fibres in uniaxial tension of composites, Advances in Materials Science and Engineering (2016) 3746161
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The materials of the tower is Q345C, Material properties are shown in table 1.Wind wheel diameter is 52meters.
Table 1 Physical properties of the tower material Material Modulus[GPa] Density[kg·m-3] Poisson's ratio Q345C 206 7850 0.3 Table 2 Tower size parameters No.
References [1] LI Ren-nian, TONG Yue, YANG Rui, Finite Element Analysis of Natural Frequency and Vibration Mode, Journal of Gansu Sciences.2011
[2] ZHU Xing-hua1, 2, HUANG Fang-lin1, ZHANG Liu-gang1, Modal and buckling analysis for the tower of large wind turbine, Journal of Railway Science and Engineering, 2010
[5] WANG Hui-hui, HUANG Fang-lin, WU He-liang, DENG Shi-hai, finite element analysis of Wind turbine tower, Journal of Shandong Jiaotong University, 2009.

Materials and methods Materials The collected Gynostemma from different origins was purchased in the local, and all products are grown in the year.
References [1] Xin Liu, Wencai Ye, Wenluan Xiao, et al: Journal of China Pharmaceutical University, Vol. 34 (2003) No.1, p. 21-23.
(In Chinese) [8] Iyer M, Morris H R, Drennen J K: Journal of Near Infrared Spectroscopy, Vol.10 (2002) No.4, p.233-245
[9] Ning Zhang, Quande Zhang, Shurong Li, et al: Food Science and Technology, (2008) No.8, p.218-221.
(In Chinese) [10] Lu Xu: Chemometric methods (Science Press, China 1995).

Granite is chosen as test materials in this paper.
Sample preparation and experimental equipment The granite, whose main components are quarts and feldspars, is chosen as parent materials, and is processed into the specification of Φ 50 × 125mm as rock samples.
Granite is brittle material.
[4] Yingsong Lin, Hongkui Ge, Shunchang Wang: Chinese Journal of Rock Mechanics and Engineering.
Li: International Journal of Rock Mechanics and Mining Sciences.

Each of the model elements is assigned physical attributes to them, such as materials, sections, modulus, and damping.
Applied Mechanics and Materials, 103 (2012) 285-291
Journal of Central South University: Science and Technology, 39 (2008)1267-1272
Journal of Central South University of Technology, 21(2014) 2494-2500
Journal of Traffic and Transportation Engineering, 8(2008): 10-14.