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Comprehensive study of the violin violin should include materials, structures, processes, and playing the violin sound pitch, duration, loudness, timbre impact, i.e., represented by physical quantities on frequency, a time, sound intensity, spectrum (Figure 1).
Also affected the nature of the strings themselves, materials and production processes, such as uniformity of the material and some other factors, the pronunciation will follow change significantly.
Different materials produced by the strings, the violin sounds different.
So, replace the strings of different materials, can change the violin tone.
Pepinsky: Contributions of science to an appreciation of music, Journal of the Franklin Institute, Vol.235 (1943), p.361-392

Experiments Materials.
Park: Journal of Colloid and Interface Science, Vol. 240 (2001), p.349
Ye: Journal of Magnetism and Magnetic Materials, Vol. 320 (2008), p.1499
Zhang: Journal of Magnetic Materials and Devices, Vol. 38 (2007), p.51
Sain: Journal of Smart Materials and Structures, Vol. 17 (1998), p.693

Experimental Material.
Table 5 Compressive strength comparison of different cementing materials net paste Cementing material compressive strength [MPa] R1 R3 R7 SL 0.98 10.65 17.10 SLC 2.08 10.72 18.32 OPC 1.09 9.85 15.89 Table 6 Compressive strength comparison of mortar with SL, SLC and OPC Cementing material compressive strength [MPa] R1 R3 R7 SL 0.22 1.30 3.13 SLC 0.36 1.54 3.43 OPC 0.24 0.76 1.53 Compressive strength of paste with SL is higher than OPC except R1, and compressive strength of paste with SLC is all higher than OPC showed in table 5.
Acknowledgements Financial support for this work was provided by Chinese National Natural Science Foundation (50974082) and by National Science and Technology Support Programme (2008BAB32B14).
Zhou: The Chinese Journal of Nonferrous Metals, Vol.12(1998), p.739-744
Wang: Journal of University of Jinan (Science and Technology), Vol.13(1999),p.6-8.

However, the collagen fibers as a natural biological polymer materials, has unique properties of surface reactivity that the other polymer materials are not available.
Surface reaction of collagen fibers is unique properties that the other polymer materials are not available.
This composite film can be used to prepare porous filter material, immobilized enzyme carrier material, heavy metal particle absorbing material, sound-absorbing composite materials, synthetic leather breathable coating materials [3-6].
Experimental Materials.
Materials Science and Engineering B, Forum Vol. 86, (2001), p. 210-218

In the field of industrial engineering and information science, optical science increasingly wide range of applications, optical measuring more important in engineering applications.
Introduction Integrating sphere is a hollow sphere , the inner wall is coated with a reflective material diffuse ideal sphere , the external material is generally a metal material , its wall has a plurality of ball apertures for placing a light receiving or light wells sphere.
[8]Han-ping Wu.The basis of photoelectric system disign[M].Bei Jing,Science Press. 2010
[10]Xiao-bing Zheng,Yin-lin Yuan,Qiu-yun Xu,et al.New reference sources for radio metric calibration[J].Journal of Applied OPtics,2012,33(1):101-108
[11]Hong-xing Liu,Jian-wei Ren,Xian-sheng Li,et al.Screening of LED for spectrumtunable light source[J].Journal of Applied Optics,2013,34(1):56-61

NUMERICAL SIMULATION OF BOREHOLE HEAT TRANSFER WITH PHASE CHANGE MATERIAL AS GROUT Jinlong Wang1, Jingde Zhao1*, Ni Liu2 1Donghua University, 2999, North People’s Road, Shanghai 201620, China 2University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China *corresponding author: zhaojingde@dhu.edu.cn Keywords: ground source heat pump, ground heat exchanger, phase change materials, thermal energy storage, numerical simulation.
In this paper, phase change materials (PCMs) are used as grout instead of common materials.
Three models employ soil, phase change materials, and heat transfer enhanced phase change materials as grout respectively.
Here, phase change material is the mixture of n-decanoic acid and lauric acid (DLC) as 7:3.
In this paper, the phase change materials are employed as grout.

Department of materials science and engineering, Faculty of Physical Science and Technology, Yunnan University, Kunming 650091,China 2.
It concludes that the synthesized materials could satisfy the desired value.
[5] Xueju MA and Xiuhua CHEN: Journal of Rare Earths.
Deevi: Materials Science and Engineering A.Vol. 348 (2003), p.227 [7] L.
Pederson: Materials Letters.Vol. 10 (1990), p.6 [8] L.

Boey School of Materials Science & Engineering Nanyang Technological University Nanyang Avenue Singapore 639798 a Corresponding Author, miytok@ntu.edu.sg Abstract Boron carbide is one of the hardest materials known.
Ribeiro, "High-energy ball milling of powder B-C mixtures," Materials Science and Engineering: A, vol. 422, pp. 184-188, 2006
Ding, "Plasma spray boron carbide coating," Journal of Inorganic Materials, vol. 13, pp. 918-922, 1998
Brand, "Chemical vapor deposition of boron carbide," Materials Science and Engineering B, vol. 79, pp. 191-202, 2001
Qiu, "Oxidation behaviour of boron carbide powder," Materials Science and Engineering: A, vol. 444, pp. 184-191, 2007

Journal of Composite Materials, 2020; 54(26):4011-4024
Journal of Composite Materials, 1973; 7(4):448-464
Journal of Composite Materials, 1991; 25(3):274-301
Journal of Composite Materials, 1991; 25(1):2-43
Journal of Composite Materials, 1999; 23:2248-2280.

Journal of Materials Processing Technology. 2004, 151:133–140
Journal of materials processing technology. 1997,63(1-3): 67-71
International Journal of Mechanic Sciences. 2001, 43 (10):2331–2347
Journal of Mechanical Sciences. 1998, 33 (1):91-97
Journal of material processing technology. 2003,139 (1):1-7