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Experimental Procedure The purity of material was all 99.99%.
Acknowledgment This work was supported by natural science foundation of China under contract 61076004 and natural science foundation of Hebei province under contract E2009000050.
Hageman, “Thick GaN layers grown by HVPE: Influence of the templates”, Journal of Crystal Growth, vol.310, pp. 3957-3963, August 2008
Morkoc, “Comprehensive characterization of hydride VPE grown GaN layers and templates”, Materials Science and Engineering: R: Reports, vol.33, pp.135-207, June 2001
Cherenkov, et al., “High quality GaN layers grown by hydride vapor phase epitaxy — a high resolution X-ray diffractometry and synchrotron X-ray topography study”, Materials Science and Engineering B, vol. 78, pp. 22-27, October 2000.

Therefore, the cross wedge rolling is an advanced forming technology for an energy-efficient and materials of the shaft parts, the intersection and the extension and development of metallurgical technology rolling and machining technology, Comparing traditional cutting, forging shaft parts forming, can 3-7 times increase productivity, improving material utilization of 20-40%, reducing the advantage of about 30% of the cost of production, etc. [4] - [8].
The project was supported by the National Natural Science Foundation of China (Grant No. 51075216), the Science Foundation for Distinguished Young Scholars of Zhejiang (Grant No.
(Ph.D., School of Mechanical Engineering University of Science and Technology Beijing 2011), pp.28-32.
Hu: Journal of Plasticity Engineering, Vol. 17 (2010) No.2, pp.79-84.
(In Chinese) [9] Y Li Q: Lovell Michael R, Slaughter William and Tagavi Kaveh: Journal of Materials Processing Technology, Vol.(2002),pp.125-126:248-257

Lovell, Investigation of springback in high strength anisotropic steels, Journal of Materials Processing Technology 159 (2005) 91–98
Yoshida, Air bending and springback of stainless steel clad aluminum sheet, Journal of Materials Processing Technology 210 (2010) 272–278
Li, An analytical model for predicting springback and side wall curl of sheet after U-bending, Computational Materials Science 38(4) (2007) 707–715
Li, Effect of the material hardening mode on the springback simulation accuracy of V-free bending, Journal of Materials Processing Technology 123 (2002) 209–211
Lihong, Springback control of sheet metal forming based on the response-surface method and multi-objective genetic algorithm, Materials Science and Engineering A 499 (2009) 325–328

Example 1 For graphite / epoxy materials , we set The restrict condition is four simply supported edges, laying angles are respectively a/h=10, introducing dimensionless inherent frequency, calculation results see Table 1 .
The material density is 1600kg/m3, ply angle are .
[2]Jones R M.Mechanics of composite materials[M].
Journal of composite materials,1990,7(2):99-109
Journal of composite materials,1986.3(2):64-73 [18] Reddy J .

A sample of Ti6Al4V alloy was employed as the experimental material.
The shock-induced deformation was considered to be un-axial and planar, the pressure pulse was considered to be uniform in space, and the materials obeyed Von Misses yield criterion.
References [1] Charles.Montross, TaoWei, Lin Ye, et al., International Journal of Fatigue Vol.24 (2002), p. 1021-1036 [2] G.
Merrien: Materials Science and Engineering A Vol.A210 (1996), p.102-113 [8] J.N.
Rhode: Journal of Applied Physics Vol. 42(1971), p.71-82

Journal of Wood Science. 2019;65(1):25
Advances in Materials Science and Engineering. 2021;2021:1-9
Construction and Building Materials. 2018;165:241-6
Journal of Renewable Materials. 2019; 7(7):583-600
Materials Today Communications. 2020;25:101392.

High nitrogen austenitic stainless steel is a developing new engineering material.
Experimental Materials and Procedure High nitrogen austenitic stainless steel (HNS) was used in the experiment and its chemical compositions (mass fraction in percent) and welding wire ER309L with the diameter of 1.2mm was used to hybrid laser-Arc welding was shown in Tab.1.
[4] Zhao Pu:Journal of Iron and Steel Research Vol.15(2003),p.21-24,in Chinese
[5]Bagger C．Olsen F O:Journal of Laser Applications Vol.17(2005),p.2-14
[6] Li Zhi,Gao Qian:Journal of Iron and Steel Research Vol.17(2005),p.68-72,in Chinese

It often occur that the actual stress area is reduced and the decrease of strength of materials due to wood truss structure easily be affected by insect erosion.
Experimental models and apparatus Material and size of truss models.
Journal of Huangshan college, 2011, Vol. 13, NO. 3:61-63
Journal of Fujian construction ,2005, Vol. 95, 96, NO. 5, 6:196-196
Journal of building structure ,2012 ,Vo.

Preparation of nanosized materials.
In order to study the efficiency of different sensing materials in the catalytic oxidation of acetone, a great deal of nanosized materials and their compound bodies were prepared.
The CTL spectrums of acetone on various sensing materials were different.
References [1] H.J.Kim, H.S.Shin: Journal of Separation Science 34( 2011), 693-699
Fu: Materials Science Forum 694 (2011) 184-188

The basic material used for advancement in concrete is often composed of essential limiting materials such as concrete, fine aggregate, coarse aggregate, and water.
These issues with cementitious materials can be avoided by using a self-recuperating component.
Sodium silicate has a wide range of applications in cementitious materials.
[7] Jinxi Zhang, Jiangang Wang, Xinghai Li, Tongju Zhou and Yangyang Guo (2018), Rapid Hardening controlled low strength materials made of recycled fine aggregate from Construction and Demolition waste”, Construction and Building Materials, Elsevier, 81-89
Swaminathen, Akoju Ramu, Bypaneni Krishna Chaitanya (2021), “Assessment of strength and durability parameters for concrete with partial replacement of coarse aggregates by iron slag and glass powder as an additive”, 3rd International Conference on trends in Material Science and Inventive Materials (ICTMIM 2021) 12th-13th March 2021, Coimbatore, India.