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Introduction Composite products are being increasingly used and are becoming an important class of engineering materials for a wide range of applications, such as the aerospace, athletic and recreational equipment, transportation, infrastructure structures, military, electronic and chemical industry.
Verdière :Composite Science and Technology, Vol. 59(1999), p.1439-1449 [2] Takashi Ishikawa, Tsu-Wei Chou: AIAA Journal, Vol. 21(1983), p.1714-1721

Preparation and Retarding Characteristics of Coal/Mg,Al-hydrotalcite Composites Xiubin Ren1,a, Anning Zhou1,b, Bo Liu1,c,Long Lei1,d 1College of chemistry and chemical engineering, Xi'an University of Science and Technology, Xi’an Shannxi, 710054, P.R.
In addition, MgO and Al2O3 from the Mg,Al-hydrotalcite can serve as a fire retardant filling to support the carbonaceous layer formed by the burning of the materials, which can effectively block the thermal transmission and oxygen exchange, and restrain the fire[4,12].
Wang: Journal of Wuhan University of Technology-Mater.

A Combined Beneficiation Process to Recover Iron Minerals from a Finely Disseminated Low-Grade Iron Ore Siqing Liu1, a, Min Zhang1, b, Wanping Wang1, c, Xiujuan Li1, d 1 Department of Mineral Processing Engineering, Kunming University of Science and Technology, Kunming 650093, China a647647@163.com,b282179895@qq.com,c578607690@qq.com, d497522449@qq.com Keywords: Magnetite; Hematite; Magnetic separation; Gravity concentration Abstract: In this research, a refractory iron ore is processed, according to the basic facts of mineralogical study.
Materials and methods The finely-disseminated iron ores were originated from Yunnan Ming Huiyuan Mining Co., Ltd, Yunnan China.
[4] Fuji Yu, Zehong Wang: submitted to Journal of Mining and Metallurgical Engineering (2009)

Model is shown in figure1: Figure.1 Three-dimensional solid model 2.2 To establish the model The material of Fresnel lens mold machine tool bed of large diameter is HT250, elastic modulus E=66178MPa, the Poisson's ratio =0.27, the density of =7200kg/m3.
The local vibration mode shows that the bed local stiffness is low, there is the phenomenon of uneven stiffness composed of body parts of the structure, the main reason may be the different parts of the material distribution is not reasonable, uneven wall thickness, the section shape not specification and so on.
Journal of Northeastern University (Natural Science), 2011 Jul [2].Liang Jun, Zhao Deng-feng.Summary of the model analysis method.moder manufacturing engineering, 2006 08 [3].Wang Yan-hui,Wu Jian-guo,Miao Jian-chen.Modal analysis and structure optimization for precision machine tool bed.Machinery Design &Manufacture,2005 03 [4] He Jun,Lai Yu-huo,Tang Qing-chun,Fang Xue-ming,Shen Ling-ling.Research on the modal analysis of the bed based on the ANSYS Workbench12.China New Technologies and Products,2011 NO.14

Applied Mechanics and Materials.2013,427-429,pp1128-1131
Turkish Journal of Electrical Engineering and Computer Sciences. 2006, 15(4)

[2] Haoxue Liu: Academic Exchange Conference Symposium of "Digital Imaging Technology and Image Materials Science" (2006), P.188
[3] Haoxue Liu: Journal of Beijing Institute of Graphic Communication Vol.16 No.6 (2008), P27

The samples and solid residues of pyrrhotite were analyzed by XRD and SEM to determine the changes of components after bioleaching. 2 Materials and methods 2.1 Microorganisms and culture media L. ferriphilum (DQ343299) and A. manzaensis (YN25) used in the experiments were provided by the Key Laboratory of Biometallurgy in Central South University.
Nardini, Bioleaching of a pyrrhot ite ore by a sulfooxidans strain: kinetic analysis, Chemical Engineering Science, 55 (2000) 783-795
[13] Nelson Belzile, Yuwei Chen, Meifang Cai, Yuerong Li, A review on pyrrhotite oxidation, Journal of Geochemical Exploration, 84 (2004) 65–76.

The magnetization process with this type of materials is generally dominated by nucleation [2].
Acknowledgments This work was supported by National Natural Science Foundation for Young Scholars of China (Grant No. 51104188).
Landgraf, Journal of Phase Equilibria, Vol. 21 (2000) , P. 443

Simulation and Test of Seperated and Manually Adjustable Shock Absorber Zhenping Zhou 1, a, Jing Tong2,b, Zhiyuan Gu 3,c ,Gongke Yang2,d and Dafeng Song 4,e 1 College of Mechanical Science and Engineering，Jilin University, Changchun，130022，China 2 College of Automotive Engineering, Jilin University,Changchun, 130022, China 3 Beijing Hengyuntong Machinery co.ltd, Beijing, 101102, China 4 State Key Laboratory of Automotive Simulation and Control, Jilin University,Changchun, 130022, China a zhouzp@jlu.edu.cn, b tongj@jlu.edu.cn, c gzyyuan@sohu.com, d ygk2014@163.com, e songdf@126.com Keywords: Seperated and air-charged adjustable damping shock absorber, Damping characteristic, Damping matching, Simulation and test.
Advanced Materials Research Vols. 694-697 (2013)
International Journal of Non-Linear Mechanics 38(2003)161-171.

IEEE Journal of the Electron Devices Society 10 (2022), pp. 989-995
[5] Masuda, T. et al. 2020 Materials Science Forum. vol. 1004, pp. 758-763 [6] Chen, C. et al.