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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.

Field emmission scanning electron microscopy (FESEM) will be used for study of the surface morphology of materials synthesized in thin film form.
Before deposition process, cleaning of substrate plays important role, which prevents contamination of the sample allow for correct deposition of materials.
Elsaeedy, A low temperature synthesis of Ag2S nanostructures and their structural, morphological, optical, dielectric and electrical studies: An effect of SDS surfactant concentration, Materials Science in Semiconductor Processing, 93 (2019) 360-365
Lokhande, Photoelectrochemical investigation of Ag2S thin films deposited by SILAR method, Materials Chemistry and Physics, 72 (2001) 105-108
[16] Faisal Baig, Yousaf Hameed Khattak, Bernabé Marí Soucase, Saira Beg, Shafi Ullah, Effect of anionic bath temperature on morphology and photo electrochemical properties of Cu2O deposited by SILAR Materials Science in Semiconductor Processing, 88 (2018) 35-39

International Journal of Production Research ,Vol.3(1982) ,p.319-337 [3] Lunlai Wan, Daqin Li, Flexible nature of its construction strategy.
Journal of Management Sciences.
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Chaotic characteristic analysis of concrete fracture system Based on Lyapunov Exponent Stability Criterion Junwei Song School of Civil Engineering, Jiangxi university of technology, China okby@sina.com Keywords: Lyapunov exponent; concrete materials; features of stages; chaos; dynamics; stability criterion Abstract.
According to the research on whole curves of strain-stress of concrete materials, the paper illustrates in evidence features of stages and shows that the discrete feature of curve often occurs in strain-softening stage.
It is significant to understand and master the concrete stage characteristics further and chaotic forecast in properties of concrete materials through several researches on typical concrete’s chaotic features in different stress stages.
Journal of the American Water Re-sources Association,1998:301~310 [3]Song Yu, Chen Jia-jun, Sun Xiong.
Beijing: Science Press,2000

Introduction Laminated plate shell structures have been widely used in aerospace, construction, machinery, the National Defense Science and other fields, and the analysis of design has also been concerned by people [1,2].
Other material parameters, poisson’s ratio Fig.3 1/4 Cylindrical shell , density; cylindrical shell subjects to weight, curved boundaries are supported by horizontal diaphragm, straight edges are free.
References [1] S.Jayasankar, S.Mahesh, S.Narayanan and Chandramouli Padmanabhan: Journal of Sound and Vibration Vol. 299(2007), P.1-11
[4] Xu Yanhai, Jia Liping, ZhangJianwu: Chinese Journal of Applied Mechanics Vol. 20(2003),P.110-113, in Chinese
[5] Shen Xiaoqin, Li Kaita: Journal of Xi an Jiaotong University Vol.41(2007), P.1483-1486,in Chinese

Research on the Methods of Determination of Characteristic Strength of Brittle Rock materials in Compression Test Bin WANG 1, a, Jie-bing ZHU 1,b , Ai-qing WU 1,c 1 Changjiang River Scientific Research Institute，Wuhan, 430010，China acugwangbin@163.com, bzhujb@vip.163.com, cwuaiqing@vip.sina.com Keywords: Brittle rock; crack closure; crack initiation; crack damage strength; damage threshold Abstract: The failure of rock materials in compression test suffers three characteristic stages: crack initiation, crack damage threshold, and macro-failure.
The AE monitoring method and the lateral P-wave or the axial S-wave test is an effective indicative of identifying the damage threshold when subject an axial compression failure. 1 Introduction Due to the long-term effects of various external loading and environmental actions, Rock materials internally exist a variety of defects such as micro-cracks, cavities, joints and so on.
Acknowledgements This work was financially Supported by National Natural Science Foundation of China (50909007), Public Welfare Industry Projects of Ministry of Water Resources(201001009)，Basic Foundation of Changjiang River Scientific Research Institute(CKSF2012002/YT).
International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 2004,41(2004):1221-1227 [4] Martin CD.
International Journal of Rock Mechanics and Mining Sciences, 2004,41(5):833-847

Kimpara, A study of crack suppression mechanism of thin-ply carbon-fiber-reinforced polymer laminate with mesoscopic numerical simulation, Journal of Composite Materials. 48(17) (2014) 2085-2096
Xu, Predicting the delamination factor in carbon fibre reinforced plastic composites during drilling through the Gaussian process regression, Journal of Composite Materials. 55(15) (2021)
Nawab, Effect of weave architecture and glass microspheres percentage on the low velocity impact response of hemp/green epoxy composites, Journal of Composite Materials. 55(16) (2021)
Asmatulu, Mitigations of machine-damaged free-edge effects on fiber-reinforced composites, Journal of Composite Materials. 55(12) (2021)
Tatus, Reducing of holes effect on composite elements strength, IOP Conference Series: Materials Science and Engineering. 848 (1) (2020) 012088

Gu: Journal of Materials Science and Technology, Vol. 24 (2008) No.6, p.899
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The 3Cr-1Mo-1/4V steel is the material of the canister of the heat-wall-hydrogen-reactor, it is the anti-heat and anti-desquamation steel, and is a special difficult-to-machine material whose adhering is serious.
Acknowledgements The research were supported by National Natural Science Foundation (51075108), China Postdoctoral Science Foundation (20090451013), Natural Science Foundation of Heilongjiang Province (E200919), Key Project of Chinese Ministry of Education (209034), Support Program for Key Youth (1154G39), Foundation of Heilongjiang Educational Committee (11551079) and Youth Foundation of Harbin University of Science and Technology (2009YF005).
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Wang, Key Engineering Materials, 329 (2007) 669-667.

Nano-materials and technology increasingly come under emphasis on application in biomedical treatment and pharmaceutical field.
Recently, application of nanoporous alumina membranes in medical science has becoming public concerned in present biomedical material field.
Luminance materials are restricted in the pore, which maybe arouse quanta size restrict effect, made some quanta point and quanta line with different materials, and develop novel photoelectron devices or device original shape.
Materials and Methods Preparation.
Lin (Eds) Journal of Membrane Science, 158, 235-241 (1999)