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Periodicity and mismatch of materials in PC results in the phononic band gaps, where the propagation of elastic waves and vibrations is forbidden.
The range of the mass density of solid materials is 1000 kg m-3≤ρ≤20000 kg m-3, so the range of the mass density ratio is 0.05≤ρ1/ρ2≤20.
Economou:Journal of Sound and Vibration Vol. 158(1992), p.377
Mao, et al.: Science Vol. 289(2000), p.1734
Qiu: Chinese Journal of Mechanical Engineering (in Chinese), Vol. 42(2006), p.150

The photo-curing properties of the new materials were tested.
So it become a focus in the field of materials science.
Yuan Jian [7] prepared polyvinyl acetate/silica hybrid materials.
European Polymer Journal, 2008, 44: 2162-2170
Journal of wuhan university of technology. 2001, 23 (2) : l-4

Electromagnetic Shielding Effectiveness of Carbon Black -carbon Fiber Cement Based Materials Shaowen Huang a, Guanghua Chen b, Qi Luo c, Yuhua Xud School of material science and engineering, Nanchang University, Nanchang , Jiangxi 330031, China ahuangsw@163.com, bchenjianhua8882002@yahoo.com.cn, cchinalodger1@163.com, dxuyuhua@ncu.edu.cn Keywords: shielding effectiveness; cement- based materials; carbon black; carbon fiber Abstract.
Carbon series materials as a shielding medium in cement based electromagnetic shielding materials have been reported in these years [3,4,5], but different conclusions were obtained.
Materials and Methods Materials.
The carbon fiber (PAN-based, 6-10μm diameter, 4-5 mm length) was from ShangHai Hongcheng Carbon Materials Corp.
Bulle Vol .31(1996),p.857 [10] Jingyao CAO,D.D.L.Chung: Cem and Con Res Vol.33 (2003),p.1739 [11] Jingyao Cao,D.D.L.Chung: Carbon Vol. 41 (2003),p.2434 [12] Yue Zhang, Rentao Zhi, Fengwu Zhu, Jimei XIAO,Runzhang Yuan and Shixi Ouyang: Chinese journal of materials research Vol .6(1992), p. 286, In Chinese

Computer Simulation of Horizontal VPE Grown AlN LIU Jiaqi1,2,a, XIE Xinjian2,b* and YANG Qinghao1,c* 1School of Materials Science and Engineering, Xi'an University of Science and Technology, Xian 710054, China 2School of Science, Hebei University of Technology, Tianjin 300401, China a13516107256@163.com, bxjxie@hebut.edu.cn, cyangxjtu@hotmail.com Keywords: vapor phase epitaxy, AlN, numerical simulation, FLUENT, film material Abstract.
Development status and trend of the third generation semiconductor materials of group Ⅲ nitride[J], Science and technology of China, 2018 (04): 15 - 18
Magnetic phase stability of transition metals doped (4,4) AlN nanosheet[J], Journal of Magnetism and Magnetic Materials, 2019
Research Progress on Preparation of AIN Powder by High energy Ball Milling[J], Materials Reports, 2014, 28 (S1): 403-405
Journal of Crystal Growth, 2019, 524

Sandstone and mudstone are major filling materials.
The compaction characteristic of rock fill materials has significant influence on dam deformation.
Vibration rolling on dam filling materials is in bound to cause surface settlement.
Journal of Tongji University (Natural Science), Vol. 40 (3), p: 397
Journal of Yangtze River Scientific Research Institute, Vol.16 (1), p: 42

Pore distribution was regular three-dimensional geometric figure when D≤3, but when D>3, pore distribution of materials have been rather complicated and irregular, three-dimensional figure of Euclidean geometry can't be used to characterize spatial distribution, we can only use D [7]. 3 Materials and test method 3.1 Materials 42.5 moderate heat Portland cement produced by Gezhouba cement mill in Guizhou, that specific surface area was 317m2/kg, chemical and mineral composition of cement clinker were shown in Table 1.
The fractal description of pore structure of porous CaO[J], Journal of Huazhong University of Science and Technology, 29(3)：82～ 84(2001); [3] Jiang Dong, Wang Jianhua, Zheng Shishu.
Study on composition、structure and properties of cement and concrete with steel-making slag powder mineral additive[D], China Building Materials Research Institute,6:111(2003); [7] Yu Lehua,Ou Hui, Duan Qingpu.
Research on pore volume fractal dimension and its relation to pore structure and strength in cement paste with perlite admixture[J], Journal of Materials Science and Engineering, (2) (2007); [8] A.Carpinteri.
Fractal nature of material microstructure and size effects on apparent mechanical properties[J], Mechanics of Materials,(18):89～101(1994).

Overview of EDM: Prior State of Art Basically Electric Discharge Machining (EDM) is a process for eroding and removing material by transient action of electric sparks on electrically conductive materials.
[4] Kumar, S., Singh, T.P. (2007), “A comparative study of the performance of different EDM electrode materials in two dielectric media”, (IE) (I) Journal-PR, Vol. 8, PP. 3-8
[10] Singh, H., Garg, R., (2009), “Effects of process parameters on material removal rate in WEDM”, Journal of Achievement in Materials and Manufacturing Engineering, Vol. 32, No. 1, pp. 70-74
[11] Pradhan, M.K., Biswas, C.K., (2009), “Modeling and analysis of process parameters on surface roughness in EDM of AISI D2 tool steel by RSM approach”, International Journal of Engineering and Applied Sciences, Vol. 5, No. 5, pp. 346-351
[12] Asif Iqbal, A.K.M., Ahsan Ali khan (2010), “Modeling and analysis of MRR, EWR and surface roughness in EDM milling through Response Surface Methodology”, American Journal of Engineering and Applied Science, Vol. 3,No. 4, pp. 611-619

High Strain Rate Tensile and Compressive Testing of Braided Composite Materials N.A.
Finite Element analysis of these materials has been undertaken and is reported in [10].
Joannic: Journal De Physique Vol.
Gilat: Journal of Composite Materials, Vol. 29/10 (1995), p.1308 [4] J.P.
Ruiz: Composites Science and Technology, Vol. 60/15 (2000), p. 2829 [5] D.M.

Carbini, An experimental study of the dissemination of Titanium and Zirconium in body, Journal of materials science: Materials in medicine, 13 (2002) 793-796
Kim, Correlation between microstructure and corrosion behavior of Zr–Nb binary alloy, Journal of Nuclear Materials, 302 (2002) 9-19
Alexandrov, Bulk nanostructured materials from severe plastic deformation, Progress in Materials Science, 45-2 (2000) 103-189
Zhu, Long-length Ultrafine-grained Titanium Rods produced by ECAP-Conform, Materials Science Forum, 584-586 (2008) 80-85
Langdon, Principles of equal-channel angular pressing as a processing tool for grain refinement, Progress in Materials Science, 51 (2006) 881–981

Journal of Materials Processing Technology 58(1996) 109 – 113 [2] J.P.
Journal of Composite Materials, 45(24), 2579-2586, 2011
Indian Journal of Science and Technology.
Journal of Composite Materials, 46(18), 2227-2237, 2011
Journal of Composite Materials, 46(26), 3321-3324, 2012