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Materials and Analysis Materials and their preparation for analysis. 
Raw rice husks were used as comparison materials; both originated in Thailand.
The importance of the obtained materials lies in the biogenic nature of silica nanoparticles, which are very well absorbed by the human body, for which the presence of silicon as a trace element is essential [10, 11].
Liou, Preparation and characterization of nano-structured silica from rice-husk, Materials Science and Engineering A 364 (2004) 313-323
Jugdaohsingh, Silicon and bone health, The Journal of Nutrition, Health and Aging, 11 (2007) 99-110

Design of WLAN anti - interference λ / 4 -absorber's parameters in 4G era ZHAO Hui-chao 1 HAO Wan-jun2* YI Ying-ying 3 DONG Yi-feng 4 WU Fan 5 WANG Ming-ming 6 CHEN dong-wei 7 (College of Materials Science and Chemical Engineering Hainan University, Ministry of Education Key of Laboratory of Application Technology of Hainan Superior Resources Chemical Materials, Haikou, 570228 P.R.China ) Email : hwj8899@163.com; (* corresponding author) Keywords : WLAN anti -interference; λ/ 4 type dielectric absorber; parameters ; Design Abstract : The problem of WLAN anti -interference has become an important issue that affects the application.
As WLAN generally is used in indoor construction, the protective material is best to use ordinary building materials with easy preparation and low cost [10,11].
Refernces [1] SM.Xue,　WLAN and implementation technique Journal of Northwest University for Nationalities(Natural Science), Vol.24 No.3（2003） P:50-56 [2] O.Hashimoto　《Technologies and Applications of Wave Absorber》CMC ,2004.
“Electromagnetism Pollution and Protection Materials for Electromagnetic Radiation,” Environmental Science and Technology, 12(29): P: 96—98 [7] Lin Hui, Liu Siyang， LTE spectrum analysis [J].
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Introduction Addictive manufacturing technology isbased on digital model files, which uses layer by layer printing of bondable materials such as powder metal or plastic to build objects[1].
This makes it an ideal tool for processing high-temperature materials[13].
[2] Blackwell P L: Journal of Materials Processing Technology. 170 (2005), p. 240
[12] Kanagarajah P, Brenne F, Niendorf T, et al: Materials Science and Engineering. 588(2013), p. 188-195
[13] Zhao Chong, Ma Chaoyang, Wen Zicheng, et al: Metal Materials and Engineering. 48(2019), p. 446-451.

In the past ten years, Beijing University of Technology was cooperation with BGRIMM Advanced Materials Science & Technology Co., Ltd.
Research progress of tungsten electrode materials[J].
Material Science and Technology DIV, 2010, 19(3): 7-9
Rare metal materials and Engineering, 2012, 41(8): 1431-1434
Chinese Journal of Rare Metals, 2012, 36(2): 260-260

Introduction In the response study of underground structures due to blast over a long distance under elastic range, stiffness of the constituent materials is the governing factor.
The two elastic constant are enough to study the behaviour of such materials [2].
Soil-pipe interaction due to blast depends mainly on stiffness of materials of the components.
This situation may be overcome by using softer material like tire-chip for backfilling.
Mannan: Behaviors of Buried Pipes due to Internal Explosion, Malaysian Construction Research Journal, Vol. 9/2 (2011), 31-48

It reveals the generation mechanism of individual innovation behavior (IIB) such as to develop new materials and new energy in manufacturing enterprises.
It has come up with the manufacturing system and manufacturing science.
It is very important to inspire employees to develop new materials and new energy according to the psychological characteristics of the production staffs of manufacturing industries.
Most people work in the organization is due to material factors.
Journal of Vocational Behavior Vol. 61 (2002), p. 20-52

Acknowledgement We would like to express our appreciation to Chinese National Natural Science Foundation (51005228).
Engrs, Part E, Journal of Process Mechanical Engineering, Vol. 219 (2005) No.11, p.275
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Zhang, C.M Lv, et al: Journal of Vibration and Shock, Vol.28 (2009) No.1, p.56 (In Chinese)