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Yao: Chinese Journal of Catalysis, Vol. 25(2004), No. 6, p. 434.

Due to use different materials, the results of different studies are quite different, even contradictory.
Experimental work Characterization of the raw materials.
Wu, etc: materials review Vol.23, No.3 (2009), p. 30-33 [6] Santosl.C, Goncalves.A and ANTOS.C.S: Hydrometallurgy Vol.23 (l990), p. 237-246 [7] ZH.L.
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College of Materials and metallurgy, Guizhou University, Guiyang 550003, Guiyang, Guizhou 2.
College of Chemistry and Materials Science，Guiyang University, 550003, Guiyang, Guizhou arose8239@163.com, b370013137@qq.com, ccaishaohan15061013@126.com, d410526416@qq.com Corresponding author: OU Meigui, Ph.D., Vice-Professor, Tel: 18984584582, E-mail: rose8239@163.com Keywords: Core-shell structure; Gd2O3:Tb3+/SiOx; NaOH; Bu4NOH Abstract: Core-shell nanoparticles Gd2O3:Tb3+/SiOx were obtained by encapsulating Gd2O3:Tb3+ in a polysiloxane shell.
Recently, core-shell nanoparticles are gradually attracting more and more attention, due to their abilities to increase the functionality, stability,and dispersibilityof the core, reduction in consumption of precious materials, and so on[] Rajib Ghosh Chaudhuri and Santanu Paria, Chem.Rev. 112(2012)2373–2433. .
In this paper, Tb3+-doped Gd2O3 nanoparticles were prepared by a polyol method previously metioned.[]Meigui Ou, Brice Mutelet, Rana Bazzi et al.Journal of Colloid And Interface Science .333(2009)684-689.
Experimental 2.1 Materials Di-ethylene glycol(DEG), GdCl3·6H2O, TbCl3·6H2O, NaOH，Bu4NOH,3-aminopropyl -triethoxysilane (APTES) tetraethylorthosilicate (TEOS), trithylamine (TEA). 2.2 Gd203: Tb3+ core synthesis Rare-earth chlorides GdCl3 and TbCl3 (99.9%) were added in 250ml diethylene glycol (99%) to obtain a precursor solution at a total lanthanide ions concentration of 150 mM in the stoichiometric Tb/Gd ratio of 5/95.

Now as a kind of intelligent material the optical fiber strain sensor has been used in state monitoring of bridges and other civil engineering basic facility by many countries.
The optical fiber strain sensor can be embedded in concrete, carbon fiber reinforced plastic and other complex material, it also can be bended on the steel surface.
It can delivery accurate and reliable test data for each stage in bridge construction, correctly appraise the stress and structure performance in construction stage, and then it can assure the construction quality and the construction safety. 2) Supplying complete and reliable science foundation for long-term health monitoring and state evaluating in service stage, for perfecting the design theory and construction technology of bridge structure, and for certifying the rationality and science of the basic assumption in analysis calculation. 3) Proceeding some favorable research for promoting the application and development of Optical fiber strain sensor in bridge(including various civil engineering structure) health monitoring, and for accelerating the structure test technique of large-scale bridge structure in our country.
References [1] Guanyong Zhang: World Bridge, Vol.3, p27-31, (2002), In Chinese [2] Shuli Chen, Su Mubiao, Zhang Wenxue: Journal of Shijiazhuang Railway Institute, Vol.3, (2004), p38-42,, In Chinese [3] Xiaodong Wang, Mubiao Su, Shuli Chen, Quanxian Sha: Highway，Vol.8, (2003), p134-138, In Chinese [4] Fawei Qiu, Wenbo Du, Jianru Qian, Guixin Zhu, Xiaohui Xu:.Bridge Construction， Vol.2, (2002), p66-69, In Chinese [5] Dansheng Wang, Hongping Zhu: Journal of China Foreign Highway ，Vol.6, (2002), p31-35, In Chinese [6] Dansheng Wang, Ning Wu, Hongping Zhu: Journal of Highway and Transportation and Development，Vol.2, (2004), p57-61, In Chinese

The first scheme is focused on the same mining rate with different sizes of coal pillars, which is mining rate of 50% as well as 30 meters, 40 meters and 50 meters sizes of coal pillar; the second one is on the basis of the first, analyzing different replacement plans in failure area of coal pillar after selecting a mining plan, for example, if the size of coal pillar is set 40 meters, the replacement analysis is made to different width of concrete materials in plastically area of coal pillar, including three schemes of 5 meters, 10 meters and 15 meters in width.
Acknowledgements This work was supported in part by the Shandong University of Science and Technology and Key Laboratory of Mine Disaster Prevention and Control.
Chinese Journal of Rock Mechanics and Engineering, 1990, 9(2):147-153
Journal of China University of Mining & Technology, 2004, 33(2):150-153
Journal of China Coal Society, 2002, 27(6):604-608

For the high tensile strength of the steel was made most use of, so, these bridges had the following characteristics: long span; material savings; light self-weight.
Acknowledgement This work was supported by the National Natural Science Foundation of China (No.50978105) References [1] Steinmain D B.
Shanhai Journal of Mechamics, 1999, 10(1): 89-94.
Journal of Kunming University of Science and Technology, 2000, 25(2): 72-74.
Journal of Building Structures, 2005, 26(2): 46-51.

Materials and Methods This test device use the same small-scale biological nitrogen reactor with the A (Fig.1) and B, which are made by the organic glass, height is 50cm, width is 60cm and length is 65cm.It is consist of air push flow aera, aeration area and clarify area, volume is 156L, aeration area volume is 75L.Raw water flow into the reactors by gravity; implement of air push flow makes water and mud backflow and mix; DO is supplied by microporous diffusers, the rotor flow adjust the amount of aeration. 1. biological nitrogen reactor 2.water tank 3. balanced reservoir 4. fluid flowmeter 5.gas flowmeter 6. air compressor 7.
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ANALASIS IN WATER AND WASTEWATER (the fourth)[M].Beijing: China Environmental Science Press,2002.

Through these steps, bridge engineers may accomplish a true integration of experiment and analysis, as well as information technology and decision sciences.
Project supported by Hunan Provincial Natural Science Foundation of China No: 12JJ4053.
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However, as a limit, that’s no building products used materials, processing, installation methods.
Xiao: Journal of Chongqing Institute of Technology.
Yang: Science and Technology Management Research.
Peng: Journal of Hunan University of technology.
Peng: Journal of Hunan University of technology.

Vladimirou, What is organizational knowledge, Journal of Management Studies, 38 (2001) 973-994
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