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Valvular leaflets made with polymer materials of porcine or bovine pericardial can be opened or closed by ejected blood.
The properties of hyperelastic material is similar to rubber.
Acknowledgment This work was supported by grants from Natural Science Foundation of State (No: 31170906) and Key Laboratory of High Efficiency and Clean Mechanical Manufacture (Shandong University)Ministry of Education.
References [1] Zhao Shixiong, Luo Zhengxiang.The statue of arificial heart valve [J], Journal of Biomechnical Engineering, vol.8, pp.277-286, 1991
[6] G.Arcidiacono;A.Corvi;T.Severi;Journal of Biomechanics;38(2005)

(3) The erosion rate is the material quality or volume loss caused by unit mass of particle impact on material surface.
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Sample and Tensile Testing Material and Sample Geometry.
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Zhang: Microporous and Mesoporous Materials, (2015), p.130–136
Aller: Chemistry of Materials, Vol. 22 (2010), No. 20, p.5667-5671
Wang: Materials Letters, (2014), p.107–110
Zhang: New Carbon Materials, (2014) No.29, p.426–431
Ji: Materials Letters, (2014) No.122, p.273–276

In this paper, a non-contact material removal technique based on the electrokinetic phenomenon is proposed for precise material removal at rates in the order of nanometers/min.
A schematic on the experimental setup for electrokinetic material removal.
Thus the material removal mechanism can be considered to be a mechanical one.
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Jimenez: Measurement and interpretation of the electrical conductivity of 1-alcohols from 273 K to 333 K (Journal of Molecular Liquids, Vol. 89 (2000), pp. 233-238

Therefore, the research and development of thermal insulation materials has recently become a hot topic in the field of building materials.
Materials and Methods Black scoria.
Materials Today: Proceedings, 26 (2020): 1964-1966
Journal of Physics Communications, 4.10 (2020): 105002
Journal of King Saud University-Science, 32.7 (2020): 2969-2975

From the viewpoint of the materials and technology, it is necessary to operate the SOFC at lower temperature (600-800℃) [3].
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Lalanne: Journal of Power Sources Vol. 171 (2007), p. 783-788

At first, we supposed that[14]： (a) The properties of materials are isotropy during analysis.
Swain: Structure and Properties of Ceramics-volume 11 of Materials Science and Technology.
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(In Chinese) [7] Xiaochi Li, Xiaogang Wang and Xiaobin Guo: submitted to Journal of Inorganic Materials (2003).
(In Chinese) [9] Yuxian Tian, Xiaogang Wang and Yaping Zhang: submitted to Journal of Hunan University of Science & Technology (Natural Science Edition) (2009).

Empirical method is the first one to be used , but with the emergence of new materials, new technology, empirical method is not applicable in many ways; Analytical method mainly uses the space expansion theory and the theory of differential surface force source; numerical method is with the aid of computer technology, by finite element method or finite difference method to numerically simulate the problem of penetration, this method is of high speed, low cost, and can simulate the operation of the projectile trajectory.Thus,more direct, more used.
Five groups of tests were conducted, the object is ultra high performance cement-based composite materials Experiment, when the bullet into vertical target, first with the positive impact of concrete, and hardness, compressive strength of concrete itself, can have high stress zone around the spot for the impact of the child, while the concrete around the bullet in the head will produce radial compression stress wave, the bullet further into the target material, is a phenomenon of shear, extrusion, and the effect of free surface of the target for make the concrete material around the bullet point from the medium particles, eventually forming a kind of like a funnel pits and radial crack, formation of the pit area should be greater than the cross-sectional area of the bullet.
Journal of explosion and shock, 2002, 22 (4) : 368-371 [3] Kenedy R P.
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The influence of SiO2 on properties of cellulose aerogel Heng Mao, Xiaoyu Huang, Chong Lin, Lingbin Lu*,Yang Cao Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, College of Materials and Chemical Engineering, Hainan University, Haikou 570228 China *lulingbin@126.com Keywords: Cellulose; Silica; Aerogel.
Experiments Materials.
Microporous and Mesoporous Materials,Vol 181 (2012), p. 254
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Progress in Polymer Science, Vol 26 (2001), p. 1605