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Ultrasonic Bulk Waves Measurements for Defect Detection of Composite Materials Nurul Wahida Zainal Abidin Sham1,a, Md Supar Rohani1,b* 1Advanced Optical Material Research Group, Department Of Physics, Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia awahida.nurul89@yahoo.com, bmdsupar@utm.my Keywords: Longitudinal wave, Shear wave, Pulse echo method, Angle beam transducer Abstract.
Composite materials have been widely used in many high performance structures due to their high specific strength and stiffness coupled with cost effectiveness over other materials.
Journal of Strain 37(4) (2001) 167-172
Pawlak, A Comparison Study of the Pulse-Echo and Through-Transmission Ultrasonics in Glass/Epoxy Composites, Journal of Achievements in Materials andManufacturing Engineering 22(2) (2007) 51-54
Akkus, The Ultrasonic Testing of The Spot Welded Different Steel Sheets,Journal of Achievements in Materials and Manufacturing Engineering 18(1-2) (2006) 247-250

The supply for key materials are normally much more variable than that of the products to which they belong, since the key material supply depends on customer configuration choices, supplier sourcing arrangements, technological changes, the availability of substitutes, and so on.
Acknowledgment The work is supported by Science Foundation of Zhejiang Sci-Tech University（ZSTU）under Grant No. 0803815-Y.
International Journal of Production Economics Vol. 70(2001), p. 163-174 [3] E.S.
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Journal of Business and Economic Statistics Vol. 25(2008), p. 78-89

The main aims and the objectives of the study focused on solving current problems of nanomaterial science of new materials – creating the scientific basis for competitive methods of obtaining and controlling new composite materials having improved strength properties based on carbon-containing polymer matrices with nanotubes stabilized in them.
Eletskii, Nanocarbon materials.
Materials Science in Semiconductor Processing. 41 (2016) 26-31
Advanced Science.
Journal of Wuhan University of Technology, Materials Science Edition. 31(2) (2016) 481-486

However, this method is enabled by many affordable materials and machines, making it optimal for cheap and fast prototyping [1, 7].
One of the most important differences between SLS and FDM or SLA is the ability of SLS to use metallic and non-metallic materials as the base material.
In addition to these, the properties of the materials used also play a prominent role.
Liu, “Rapid prototyping of continuous carbon fiber reinforced polylactic acid composites by 3D printing,” Journal of Materials Processing Technology, vol. 238, pp. 218-225, 2016/12/01/, 2016
Patterson, “Perspective on 3D printing of separation membranes and comparison to related unconventional fabrication techniques,” Journal of Membrane Science, vol. 523, pp. 596-613, 2017

Oceanic Engineering, IEEE Journal of, 2004. 29(3): p. 706-728. 4.
Smart Materials and Structures, 1998. 7(6): p.
Melton, K.N., General Applications of SMA's and Smart Materials, in Shape memory Materials, K.
Materials & Design, 2000. 21(6): p. 525- 528. 11.
AIAA Journal, 2002. 40(11): p. 42. 17.

There have been many growing learning materials in Internet.
Introduction There have been many growing learning materials in Internet (Forsyth, 1998).
The teachers can put the learning materials and connect the library resources.
Second, the resources nodes can includes teaching materials, e-books, e-journals and web pages.
Teaching and learning materials and the Internet, Routledge

Evaluation of the Surface Roughness of Wood-based Environmental Materials and its Impact on Human Psychology and Physiology Xiurong Li1, a , Yixing Liu1,b*, Haipeng Yu1,c* and Jian Li1,d 1 Key laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin 150040, China email arongrong1994@163.com; b* yxl200488@sina.com; c* yuhaipeng20000@yahoo.com.cn;d nefulijian@163.com Keywords: Environmental Materials; Surface Roughness; Psycho-physiological Analysis; Tactile Properties.
The human psychological variations of nine wooden materials were presented in Fig. 5.
The MHR of P. jezoensis is 75.2, which is the smallest compared to that of the other materials.
References [1] J Li: Wood Science (High Education Press, Beijing 2002)
Zhao: Wooden environment science (Science Press, Beijing 2007)

Study on Carbon Fiber Composite Materials in Sports Equipment Jiangzhi Zhang Shandong Sport University, Jinan, Shandong, China 250102 Keywords: Carbon Fiber Composite Materials; Sports Equipment; Use Abstract.
Compared to these materials, fiber-reinforced composite materials have obvious advantages in the following areas.
Composite material during use does not emit harmful gases, and thermoplastic composite materials can be recovered using the same time, the prices of raw materials for production of composite materials is generally low, low processing costs, conducive to the popularity of the product and promotion.
Application Examples of Carbon Fiber Composite Materials in Sports Equipment Golf clubs.
surface quality assessment of carbon fiber composite materials technology [A]; composites - based on innovation, efficiency: The 14th National Composites Conference Proceedings [8] Hu Zhigang; Dongshao Wei; of automatically reset Hurdle research and development; Journal of Beijing Sport University; 2010 06 [9] Du Xiyan, Li Wei; fiber reinforced composites in sports equipment; the Shandong Textile Technology; 2007 01 [10] Jia Wentong; Hao Junlong; Hao Shiru; Yang Lei; Wu Haiyan; industry cluster distance to the industrial base - from Cangzhou sports equipment hometown of research thinking [J]; Nanjing Institute of Physical Education (Social Sciences); 2010 03

a) titanium alloy b) mild shell c) Cu Fig.12 Perforated holes in multi-layer by the different liner materials Table 1 presents the sizes of perforated hole in experiment and numerical simulation.
Ordnance Material Science and Engineering. 30(5).2007,82-86
Progress in Materials and Processing Technology of Powder Liners[J].
Chinese Journal of Energetic Material.15(5)2007.556-559 [3] Baker E.L, Barnie.
International Journal of Impact Engineering (2008).2007.12.010 [7] Luccioni B et al.

Silberschmidt: Computational Materials Science Vol. 50 (4) (2010), p. 1286 [2] S.
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