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Abstract: Reinforced natural fibre composite materials are attracting greater attention in the area of material engineering due to their low density, low cost and higher mechanical strength.
The results showed that surface modification of AHF can enhance the impact strength of the composite materials but not the hardness of the composites.
Materials and Method Materials.
Basavaraju, “A review on the mechanical properties of areca fiber reinforced composites,” Science and Technology of Materials, 2018, doi: 10.1016/j.stmat.2018.05.004
VENKATESHAPPA, “Effect of Esterification on Moisture Absorption of Single Areca Fiber,” International Journal of Agriculture Sciences, vol. 4, no. 4, pp. 227–229, 2012, doi: 10.9735/0975-3710.4.4.227-229

The materials are mixed in the using place , but it should be not concreted before mixture by 24 hours , and after 24 hours it results in quick-concreting .
The main materials consist of sulphur aluminate cement , retarder and suspend agent .
The prepared materials consist mainly of gypsum , lime , suspend agent , quick-hardening early strength agent and so on .
After the main materials and the prepared materials are mixed by water separately , hydration reaction would create a great amount of ettringite (3CaO·Al2O3·3CaSO4·32H2O) in crystal cell of ettringite , the cubage of water molecule is greater than 80% , thereby , the high water cement ratio is realized [1~5] .
[6] Yi Hongwei , Zhou Huaqing and Zhang Lianxin : Research on basis performance of high-moisture ash filling material [J] , Underground Pressure and Roof Control , 1991 , 9(4): 13 ~ 17 [7] Liu Changwu , Lu Shiliang : Impact and effect of grouting reinforcement of cement on engineering rocks [J] , Journal of China University of Mining and Technology , 2000 , 29 (5) : 454 ~ 458 [8] Wang Jinhua , Wei Jingyun and Ning Yu : Practice and theory of chemical reinforcement for surrounding rock of roadway [J] , Coal Journal , 1996 , 21 (5) : 481 ~ 486

Similarly, the elastic wave propagates in the periodic composite materials so-called phononic crystal can also have bandgap.
Figure 1 shows the sketch of one dimensional phononic crystal that two materials alternate periodic in x direction and exhibit infinitely in both y and z directions.
The physical parameters of the two materials are list in table 1.
Two materials arranged as Al/epoxy is studied.
Wang, Science China Vol. 37 (2007), p. 544 [11] Y.

A Fast Subdividing Circuit Design for Moire Frenge Grating with Smart Materials and Structures Nuan Song1, a, Yi Wu2,b , Wei Quan3,c , Wei Zheng4,d 1,2,3Air Force Aviation University, ChangChun,China abluebirdsong@163.com Keywords: CPLD grating sensor subdivision technolgy ,smart materials and structure Abstract.
In addition, we have introduction of the exterior synchronous clock .The technology not only overcome the instable situation but also improve anti-jamming of circuit system .It has been proved that the method get the better effort in practice. Ⅰ Introduction Along with the development of science and technology, all kinds of precision detection techniques of precision also put forward higher request.
The PLA university of science and technology journal (natural science edition). 2003, (4) : 74 ~ 76

Study on synergistic scale inhibition performance of the rare-earth permanent magnetic material and polyaspartic acid Zhenfa Liu1, a, Hanshuo Liu2,b, Lihui Zhang1,c and Meifang Yan1,d 1Institute of Energy Resources, Heibei Academy of sciences, China 2Heibei University of Technology, China alzf63@sohu.com,beffie87.student@sina.com, czlhkxy@sohu.com, dyanmeifang525@sina.com Keywords: rare-earth permanent magnetic material, polyaspartic acid, scale inhibition, water treatment Abstract.
Materials and Methods Synthesis of PASP.
The production technique of PASP is simple and innoxious.The static and dynamic experimental results show that the synergistic scale inhibition effect of rare-earth permanent magnetic material and PASP is good and adapts to high hardness and rate of concentration circulating cooling water system Acknowledgements This work was supported by the Science Foundation of Hebei Province(B2007000956).
Journal of Materials Science Letters, Vol.15(1996),P. 613 [7] K W Busch, M A Busch.
Materials Performance, Vol.2(1997),P. 53

Hence, it is a key physical property of all materials.
Balasubramanian and D.S.Sarma, Journal of Materials Science, 34 (1999) 2929 [11] Fazio, M.
O’Brien ,Standard test method for resistivity of electrical conductor materials, ASTM: 1990; B193-89, Vol. 02.01
[19] Walkerm P.M.B., Materials Science and Technology Dictionary, 1999; Chambers Harrap Publisher, ISBN 0 550 13249 x
Aly, Australian Journal of Basic and Applied Sciences, 5[7] (2011) 27 [21] L.W.Kempf, C.S.Smith, Members A.I.M.E., and C.S.Taylor, Thermal and Electrical Conductivities of Aluminum Alloys, New York Meeting.

Machinability for C/SiC Composite Material by Electrical Discharge Machining Yongfu Zhang1,a, Weiwei Chen2,b,*, Huanwu Cheng3,c and Yuping Zhang4,d Department of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China agyshuishangpiao@163.com, bwwchen@bit.edu.cn, cchenghuanwu@bit.edu.cn dstu_zhangyuping@126.com Keywords: C/SiC composite material; Electrical Discharge Machining; Machinability Abstract.
Therefore, it could not be better if this kind of material is applied in the high temperature structural materials and space structural materials.
So it is proper to machine hard and brittle materials.
Therefore, materials like Cu-W alloy are recommended strongly to process these hard and brittle materials.
[6] Yunzhou Zhu, Zhengren Huang, Shaoming Dong, Ming Yu, Dongliang Jiang, Pressureless preparation and properties of C/SiC composites, Journal of Inorganic Materials. 22 (2007) 685-689

At present, the research of cold-recycled base material for fracture toughness also less, the same reference to fracture toughness of concrete material relevant material for cold fracture toughness of recycled materials.
Journal of Central South Highway Engineering Vol.3(2007),p.124-126
Journal of Hebei University of Technology Vol.3(2004),p.108-112
[8] Jia Kan.Study on the Fatigue Performance of Semi-rigid Base Course Materials.XiAn: Changan University.2008
Science press,1981

Influences of Reaction Temperature on Structure and Performances of SnO2 Nanocrystals Prepared by Microwave Hydrothermal Method Li-xiong Yina, Fei-fei Wangb,Jian-feng Huang, Dan Wang, Jia-yin Li School of Materials Science and Engineering, Shaanxi University of Science & Technology, Xi' an 710021, Shanxi, China Email: ayinlx@sust.edu.cn，bWangFeifei03@126.com * Corresponding author: Dr.
Hu: Journal of Functional Materials, Vol. 4 (2003) No.34, p.375
Yu: Materials Letters, Vol. 40 (1999)No.1, p.23
Parthibavarman: Materials Letters, Vol. 63 (2009), p.896
Cornet: Materials Science and Engineering C, Vol. 15 (2001), p.203.

The use of the paraffin waxes to improve thermal performance of textile materials became possible only by entrapping them in microcapsules with the diameter of 5-60mm[3].
[4] Nuckols, M.L. (1999), “Analytical modeling of a diver dry suit enhanced with microencapsulated phase change materials”, Ocean Engineering, Vol. 26, pp. 547-64
[5] Pause, B. (2000), “Textiles with improved thermal capacities through the application of phase change materials (PCM) microcapsules”, Melliand Textilberichte, Vol. 81, pp.
E179-8 [6] Shim, H. et al. (2001), “Using phase change materials in clothing”, Textile Research Journal, Vol. 71, pp. 495-502
[9] Kehrer, M., Kunzel, H. and Sedlbauer, K. (2003), Ecological insulation materials: does sorption moisture affect their insulation performance”, Journal of Thermal Envelope and Building Science, Vol. 26 No. 3, pp. 207-12