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Comparative Analysis on Performance of Table Tennis Racket’s Bottom of Different Materials Mao Yu1,a 1Northwestern Polytechnical University, China a345729285@qq.com Keywords: Bottom of the racket, Table tennis, Composite material.
Analysis on Function and Physical Properties of Materials of Racket’s Bottom.
Modulus ratio is the ratio between the modulus and density, which can be used to weigh the contribution of unit weight of the material on the bottom plate of elastic modulus, high specific modulus is one of the important basis for the development of new materials for rackets.
At present, the composite materials used by the racket's bottom mainly are carbon fiber, aryl fiber, aromatic carbon, composite fiber and glass fiber, the performance of various materials are shown in Table 1.
Zhang, Journal of Shenyang Sports University, Vol.25(1992)No.4, p. 40.

However, there are no practical HAp materials for the treatment of tooth decay and hypersensitivity.
Moreover, the resin materials contain an ingredient that causes an allergic response.
The surface quality of tooth inhibits to unify the HAp materials into the enamel.
Sasaki, Effect of hydroxyapatite film formed by powder jet deposition on dentin permeability, European Journal of Oral Sciences. 120 (2012) 558-562
Palma-Dibb, Influence of energy and pulse repetition rate of Er:YAG laser on enamel ablation ability and morphological analysis of the laser-irradiated surface, Journal of Biomedical Materials Research.

These gases which do harm to human beings [4] at a low concentration can be released from decorative materials [5, 6], vehicle exhausts [7], industry manufacture [8] etc.
Grossi: Chemistry Central Journal Vol. 6(1) (2012), p.21
Kang, et al: Journal of Natural Gas Chemistry Vol. 20(5) (2011), p.515-519
Li: Journal of Materials Science-materials in Electronics Vol. 22(4) (2011), p.418-421
Khalid: Journal of Hazardous Materials Vol. 186 (2-3) (2011), p.2037-2042

These papers indicate that the bionic unit is the key to improve the materials.
Materials Science and Engineering A. 412 (2005) 323-327
Journal of Materials Processing Technology. 190 (2007) 211-216
Materials Science and Engineering A. 433 (2006) 144-148
Journal of materials processing technology. 206 (2008) 473-480

Preparation and characterization of rare earth composite catalytic materials for conversion of exhaust from natural gas automobiles YanKun Yuan, Gang Xue *, Saifei Wang and Xueliang Zhang Institute of Power Source and Ecomaterials Science, Hebei University of Technology, Tianjin 300130, China *xuegang@hebut.edu.cn Keywords: composite materials, rare earth, catalysis, natural gas Abstract.
In this paper, preparing a series of rare-earth composite catalytic materials that contains mixture of La0.9Sr0.1Co0.5Mn0.5O3 and Ce0.7Zr0.3O2 along sol-gel method, studying the structure and catalytic properties of the composite catalytic materials. 2.
Fig.1 XRD patterns obtained for rare earth composite catalytic materials LZ1, LZ2 and LZ3 Fig.2 TEM photographs of rare earth composite catalytic materials (a) LZ1, (b) LZ2 and (c) LZ3 3.3 Specific surface area of catalytic materials The specific surface area test of rare-earth composite catalytic materials is shown in Table 2.
Fan: Journal of the Chinese rare earth society, 22(4):522~526 (2004) [8] B.
Zhang: Journal of the Chinese rare earth society, 21:98-99. (2003) [9] P.

Introduction Left-hand materials (LHM) or negative refractive medium is a new type of artificial electromagnetic materials developed in recent years [1].
Because of the different dielectric constants and the permeability of left-hand materials(LHM) are related to the parameters of S11 and S21.
Hung: Submitted to Journal of MicroWaves (2004)
Wu: Submitted to Chinese Journal of Radio Science (2006)
Lv: Submitted to Journal of Micro Waves (2007)

Presently, the need to characterize the constitutive parameters of materials has increased due to the manufacture of new materials and development of computational analysis software intending to reproduce the real behavior which depends on the quality of the models implemented and their material parameters.
Introduction The characterization of materials is having an increasing attention due to the manufacturing of new materials and development of computational analysis software.
However different materials may have similar properties.
International journal for numerical methods in engineering. 74:1872-1895, 2007
Key Engineering Materials 554:2200-2211, 2013

The crystalline phase of raw materials was inspected.
Materials and Methods 2.1 Preparation of raw materials.
Crystalline phase within raw materials.
SRIROTH, Zero Waste Management to Increase Efficiency in Palm Oil Production and Processing for Food Security in Thailand, Walailak Journal of Science and Technology (WJST), 14 (2016) 589-596
Neamlut, Reutilizing Sediment Soil Wastes from Water Supply Treatment Process as Replacement Materials of Non-Fired Wall Tiles, in: Materials Science Forum, Trans Tech Publ, 2018, pp. 303-310

However, those materials are extremely difficult to machine with conventional machining methods.
Silberschmidt, Analysis of material response to ultrasonic vibration loading in turning Inconel 718, Materials Science and Engineering A. 424 (2006) 318-325
Dargusch, Thermally enhanced machining of hard-to-machine materials-A review, International Journal of Machine Tools and Manufacture. 50 (2010) 663-680
Ni, A model for predicting the heat flow into the workpiece in dry drilling, Journal of Manufacturing Science and Engineering. 124 (2002) 773-777
Elharif, Numerical simulation of orthogonal cutting by incremental elsto-plastic analysis and finite element methods, Journal of Materials Processing Technology. 141 (2003) 181-188

Recently, functionally graded materials (FGMs) have gained momentum as a new kind of advanced composite materials.
Unlike classical MMC, FGMs do not suffer from interrupt changes in constituent materials within the FG structural elements.
Bert, "The effect of bending–twisting coupling on the critical speed of a driveshafts," in US Conf on Compos Materials, Orlando, FL.
Metallic Functionally Graded Materials: A Specific Class of Advanced Composites, Journal of Materials Science & Technology, vol. 29, pp. 297-316, 4// 2013
Wave propagation characteristics of a twisted micro scale beam, International Journal of Engineering Science, vol. 53, pp. 46-57, 2012