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However, the thickness and density of non-woven materials are the two most important factors.
In our study, three samples of the same thickness, different density materials are studied.
Meanwhile, the sound can be reduced by propagating in the materials.
So the corresponding acoustic absorption materials required for the performance are weakened.
Besides, due to limited experimental conditions, this article only conducts some superimposed contrast experiments on bulk density ratios of two different materials, and in the future we can combine with three or more different materials of different density, and compare with single-layer materials, in order to identify the best ratio.

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Furthermore, the frictional heat causes the materials to deform plastically [2].
Shrivastava, “Ductile fracture based joint formation mechanism during friction stir welding,” International Journal of Mechanical Sciences, 168, Nov. 2019
Dhindaw, “Numerical simulation of temperature distribution using finite difference equations and estimation of the grain size during friction stir processing,” Materials Science and Engineering A, 543, 231-242, Mar. 2012
Rynkovskaya, “Development of a Finite Element Model for Thermal Analysis of Friction Stir Welding (FSW),” IOP Conference Series: Materials Science and Engineering, 495, 2019
Bauri, “Effect of friction stir processing on microstructure and mechanical properties of aluminium,” Materials Science and Engineering: A, 539, 85-92, Jan. 2012

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Introduction In constructions, the cement-based concrete is one of the most often used materials.
This material is one from group which is generally called cement composite materials.
Seitl: Experimental study of the influence… Key Engineering Materials, Vols. 525–526 (2013), ISSN: 1662-9795
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Winkler, Solution-processed all-oxide solar cell based on electrodeposited Cu 2 O and ZnMgO by spray pyrolysis, Journal of materials science 53.17 (2018) 12231-12243
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Al-Hadethy, Transparent and conducting ZnO films prepared by reactive pulsed laser deposition, Journal of Materials Science: Materials in Electronics 18(4) (2007) 397-400
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Salim, Optical investigations and optical constant of nano lithium niobate deposited by spray pyrolysis technique with injection of Li2CO3and Nb2O5 as raw materials, Journal of Materials Science: Materials in Electronics 29(11) (2018) 9200-9208

Both materials are combination of Al2O3 and Zr02 and their material properties are summarized in Table 1.
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The quasi-experimental design is utilized for the learning assessment, where the experimental group applies MMBCLS, while the control group uses general instruction for the teaching materials.
Aiming at teaching media, a lot of teachers do not use interesting digital materials, as such digital games do not conform to their demands [11].
Association for the Advancement of Computing in Education Journal,13 (3), 233–250
School Science and Mathematics, 101(2), 91-101
International Journal of Computing and Information Sciences, 5(2), 63–73.

Criteria measurement values for candidate materials Material No.
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A target-based normalization technique for materials selection.
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