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Material and Methods Materials.
Smulski: Wood and Fiber Science Vol.23 No.1 (1991), p. 44-57
Ross: Forest Products Journal Vol.50 No.2 (2000), p.35-40
Samali, K: Journal of Wood Science Vol.53 (2007), p.394-400
Guitard.: Wood Science and Technology Vol.36 No.3 (2002), p. 367-383

The size of the beam is 710mm × 20mm × 3mm and the material is 45#.
The material properties of the beam are listed in Table 1.
Table 1 Cantilever beam material properties Material Modulus of elasticity Poisson's ratio Mass density 45# 2.1e11Pa 0.3 7800Kg/m3 Fig.4 Mode shapes using FEM: (a) X axis first bending mode; (b) X axis fourth bending mode.
Ribeiro, Cancelation of mass-loading effects of transducers and evaluation of unmeasured frequency response functions, Journal of Sound and Vibration 236 (5) (2000), 761-779
[7] Author: Debao Li Title: "Experimental Modal Analysis and Applications," Publisher: Science Press Publication date: January 6, 2001.

Materials and methods Materials and Reagents.
Ding: Journal of Environmental Engineering Vol. 2 (2008), p. 1483 [2] U.
Fang: Journal of Cellulose Science and Technology Vol. 16 (2008), p. 9 [5] Y.P.
Fang: Journal of Cellulose Science and Technology Vol. 18 (2010), p. 1 [6] Y.
Wang: Journal of Environmental Sciences Vol. 29 (2008), p.1029“In Chinese” [12] Y.C.

Because the rocks is complex internal structure and belongs to the hard brittle materials, rock deformation of the first is physical.
Sandstone physical property parameter table Name Density g/mm3 Compressive strength MPa Tensile strength MPa Elastic modulus GPa Poisson's ratio Sandstone 2.4 45 12.9 8.396 0.23 Today's machine main manufacture material is for 6 cr4mo2w2v, this material has great toughness, easy workability.
Numerical simulation of rock cutting using the discrete element method[J].International Journal of Rock Mechanics and Mining Sciences, 2011,48(3):434-442 [4] Zhang Ke, Wang He, Wu Yuhou, Zhao Kaijun Analysis on Key Wear Technology of the TBM Disc Cutter, Journal of Shenyang Jianzhu University (Natural Science), 2009,25(2);351-354 [5] Zhang Ke, Wang Tengyue, Sun Hong, Wang He, Zhao Kaijun:‘Simulation Study on Disc Cutter of Full Face Rock Tunnel Boring Machine’, [J].Journal of Shenyang Jianzhu University (Natural Science),2010,26,(6),1209-1213
Journal of Shenyang Jianzhu University (Natural Science),2012, 28,(1),156-161
[7] Wu Yuhou, Wang Chao, Sun Hong, Zhou Peng:‘Ansys-based finite element analysis on cutter-plate of rock excavators’, [J].Chinese Journal of Construction Machinery, 2010,10,(2),171-176.

Therefore, the use of external physical fields for the creation of nanocomposite materials and the establishment of regularities of the influence of these fields on the processes of structuring during the formation of materials is an urgent task of material science.
[2] Buketov А.V., Sapronov О.О., Brailo М.V., Aleksenko V.L., Influence of the ultrasonic treatment on the mechanical and thermal properties of epoxy nanocomposites, Materials Science. – Vol. 49, Number 5, 2014, рр. 696-702
An International Journal, 2017, Vol. 8(1), рр. 47-65
[9] Hydrogen materials science and chemistry of carbon nanomaterials: ICHMS'2007, ed. by Schur D.V., Zaginaichenko S.Yu., Veziroglu T.N., Skorokhod V.V., Kiev: AHEU, 2007, 1150
I., Testing of paintwork materials and coatings, M .: Chemistry, 1988, 272

Ti based biomaterials, the ultimate choice for orthopaedic implants–a review.Progress in Materials Science, 54(3), (2009) 397-425
Journal of Applied Sciences, 9(19), (2009) 3581-3586
Journal of Materials Processing Technology, 169(1), (2005) 54-61
Three-body abrasive wear testing of soft materials. 
Indian Journal of Science and Technology, 6(1), (2013) 3951-3956.

Journal of Magnetism and Magnetic Materials, 537 (2021), 168222
International Journal of Thermal Sciences 184 (2023) 108014
Journal of Magnetism and Magnetic Materials 567 (2023) 170329
Materials Today: Proceedings, 46 (2021) 2240-2248
Journal of Magnetism and Magnetic Materials, 201(1-3) (1999) 252-255

Table.2 Thermal physical parameters of materials Material Thermal conductivity [] Aluminum structure 121.4 FPGA 33.7 PCB Results and Discussion Through the finite element analysis temperature distributing of the PCB and the temperature of FPGA were gotten (shown in Fig.4 and Fig.5).
Acknowledgements This paper is supported by the Knowledge Innovation Program of the Chinese Academy of Sciences.
The help about analysis model from Li Kai in Academy of Opto-electronics Chinese Academy of Sciences is gratefully acknowledged.
Li: Journal of Zhengzhou University of Light Industry (Natural Science), Vol. 22(2007), p.75 (In Chinese) [4]G.C.
Wang, Tongmin Jiang: Journal of Beijing University of Aeronautics and Astronautics, Vol. 32(2006), p.716 (In Chinese) [5]Q.

Introduction Fiber suspension is attracted increasingly in many science and engineering fields, such materials science, paper-making industry, composites material production and so on.
Journal of Hydrodynamics, Ser.
International Journal of Multiphase Flow, 2006, 32(12): 1354-1369
Polymer Engineering & Science, 2012, 52(10): 2147-2156
Journal of Mathematical Biology, 1998, 36(3):269-298.

Experimental materials and method Experimental materials composition Table 1 Physical properties of cement Fineness (80μm, %) Water content for standard consistency /% Time of setting/h Compressive strength/MPa Flexural strength/MPa Initial Final 7d 28d 7d 28d 3.2 26.2 3.38 4.57 25.98 42.7 6.35 9.42 An ordinary Portland cement (42.5﹟) and common sand were used.
Science and Technology of Overseas Building Materials.Vol. 26(2005), p.38（In Chinese） [2]Chuntao Ma, Jianxia Song, Caibo Wang, Feng Zhang.Ningxia Engineering Technology.Vol.8(2009),p.56（In Chinese） [3] Shuguang Hu, Yongjia He.
Journal of wuhan university of technology.
Journal of China Coal Society.
Journal of railway science and engineering.Vol.5(2008), p.7（In Chinese）