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simulation, Geers and Hunter [4] has obtained the good estimate formula, under the given: In the (phase of shock wave), shock wave pressure: (1) Where: In the (phase of bubble pulsation), the bubble pulsation pressure: (2) Where: a can be obtained by Eq. 3-7: (3) (4) (5) (6) (7) Where: Where, and are the weight of the explosive package and the initial radius respectively, ,,,, and are the material
Wang: Modern Ship Anti-shock Theory and Applications (Science Press, China 2005)
Hunter: Journal of the Acoustical Society of America, Forum Vol.111(2002), p. 1584–1601

Under the condition of satisfying the structure stiffness, reducing material away from the constraint surface, or increasing the area of constraint surface, it can improve the stability of the mechanical structure.
JOURNAL OF SHANGDONG UNIVERSITY OF TECHNOLOGY(Natural Science Edition).2012,26(5):80-83

In order to achieve unidirectional radiation, commonly a metallic back cavity structures loaded with absorbing material is added to one side of the antenna, which will eliminates the radiation energy of the antenna in this side [3].
CHINESE JOURNAL OF RADIO SCIENCE. 2012, 06: 1204-1212

（2）Material data: elastic modulus, Poisson ratio, mass density
Engineering Journal of Wuhan University. 2007,40(1):74-7 [5] Xing Jingzhong.
Beijing: Science Press. 2006 [6] Du Yongfeng, Li Chunfeng.

The material of bearing elements is galvanized steel.
Stroiprofil journal. 2007. № 6(60), № 7(61).
Substantiation of expediency of application of technology of light steel thin-walled structures in cottage construction // XXXVIII science week SPbGPU: Proceedings of the international scientific-practical conference. 2009.

Recently, most of the plastic materials used are made from petrochemicals.
In addition to environmental pollution, the use of synthetic plastic as food packaging is also toxic, due to the migration of the plastic monomers into the food materials.
Plastics made from natural materials are also known as bioplastic.
Experimental Procedure Materials.
Castano, Purification of polluted waters by functionalized membranes, Reviews on Advanced Materials Science Vol. 21 (2009) 211-216

Materials and methods Components and Medium Formulation.
Before being charred, materials were cut into 1.0 to 2.0-cm particles and air-dried.
After charring, all materials were dipped in room-temperature water for 2 h with a ratio (by volume) of materials to water of 1:2.
The charred materials were then air-dried and passed through a 2-cm screen.
Root mass of compost-mixed materials (C, C+CHG) were lower than those in charred materials and peat (Fig. 1).

Li, Ultra-strength materials, Progress in Materials Science. 55 (2010) 710-757
Maier, Shape memory behavior of FeNiCoTi single and polycrystals, Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science. 33 (2002) 3661-3672
In Progress in Materials Science, edited by B.
Roytburd, Intrinsic Hysteresis of Superelastic Deformation, Materials Science Forum. 327-328 (2000) 389-392
Ishida, Phase transformations in Ni–Ga–Fe ferromagnetic shape memory alloys, Materials Science and Engineering A. 378 (2004) 403-408

Vikhareva, Controlling behavior of δ-ferrite in nitrogen-containing chromium–nickel–manganese steels, Inorganic Materials: Applied Research, 8 (2017) 817-826
Saveliev, Computational thermodynamics in materials science, Saint-Petersburg, Russia, Publishing house, Polytechnic University, 2010
Dobosh, Computational materials science of structural - phase transformations in casting aluminum alloys, Int.
"Structural and Phase Transformations in Materials: Theory, Computer Modelling and Experiment", 23–27 March 2017, Ekaterinburg, Russia.
IOP Conference Series: Materials Science and Engineering, 192 (2017), 012027

Research of Color And Discoloration Resistance of 18K Rosy Gold for Ornaments Yuan Junping1,2,a, Li Wei1,b, Guo Wenxian2,c 1Department of Materials Science and Engineering, Jinan University, Guangzhou, 510632, China 2Jewelry Institute of Guangzhou Panyu Polytechinc, Guangzhou, 511483, China ayuanjp@pyp.edu.cn, bliweijn@yahoo.com.cn, cguowx@pyp.edu.cn Key words: ornament 18K rosy gold color discoloration resistance Abstract. 75Au25Cu was the basic rosy gold alloy for jewelry, but it had no good brightness and was prone to tarnish and darken.
As materials for ornaments, they should have good color & brightness and better preferable discoloration resistance, and will not easily tarnish or darken when they are worn or in storage.
Pure gold, pure copper, pure zinc, pure silver, pure silicon and pure cerium were used as raw materials.
Journal of Alloys and Compounds, 1997(257): 306-312
Quantitative investigation on color characteristics of metallic materials and its application to development of nickel-free white copper alloys [D].