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Introduction Magnesium alloys are more and more widely used as structural materials since the 1990s.
In the process, the value metal extracted from the source material is dissolved in the excess molten metallic solvent and is subsequently extracted as a vapour by vacuum distillation.
Acknowledgements The present work was supported by the National Natural Science Funds of China (No.50725413), the Major State Basic Research Development Program of China (973)(No.2007CB613704), the Chongqing Science and Technology Commission in China (CSTC, 2010AC4085, 2009AB4134 and 2006AA4012-9-6), the Chongqing Education Commission in China (KJ090628) and the Program for Hundreds of Distinguished Leading Scientists of CQ CSTC (2010CSTC-HDLS).
Xie: Chinese Journal of Rare Metals (in chinese) Vol.28 (2004), p.750
Wei: Materials for Mechanical Engineering (in chinese) Vol.33 (2009), p. 83

In some cases where the application of traditional concrete structures is restricted, such as structures that require the environment without magnetic and electric interferences, the best way is to use nonmetallic materials.
FRP reinforcements is a kind of linear elastic material and exhibit several properties such as high tensile strength, light weight, noncorrosive and nonmagnetic, which make them suitable for use as structural reinforcement in marine engineering, road engineering, bridge engineering, hydraulic engineering, geotechnical engineering and some special engineering[1-3].
Materials Figure 1 shows continuous FRP rectangular spirals used in the tests.
Acknowledgements This work was financially supported by Key Project of Chongqing Science and Technology Research (CSTC, 2011AB0043).
[7] Ahmed K.El-Sayed, Ehab El-Salakawy, B.Benmokrane: Journal of Composites for Constructure.

This forced citizens to start making protective masks from various improvised materials.
However, again the properties of the materials are not disclosed, which does not guarantee a similar result when using similar fabrics.
Peltier, Evaluating the efficacy of cloth facemasks in reducing particulate matter exposure, Journal of Exposure Science and Environmental Epidemiology. 27 (2017) 352-357
Robertson, What Are the Best Materials for Making DIY Masks?
Borrmann, Aerosol filtration efficiency of household materials for homemade face masks: Influence of material properties, particle size, particle electrical charge, face velocity, and leaks, Aerosol Science and Technology. 55 (1) (2021) 63-79

Test materials and methods Reagents and equipment.
Environmental Science, Vol. 19(1998), p.47-50
(China Environmental Science Press, Beijing 1989)
Environmental Science, Vol. 21(2000), p. 93-96
Journal of Shenyang Jianzhu University (Natural Science), Vol. 22(2006), p. 604-608.

The target index in this aspect chiefly involves C41 material safety and C42 staff responsibility
The weight ranking shows that the most influential factors are material safety, managerial risks, staff responsibility, force majeure and capital risks.
Kunming: Yunnan Science and Technology Press, 2002.7.
Journal of the Eastern Asia Society for Transportation Studies,  5  (2003), p. 2920–2931 [3] C.
Analytic Hierarchy Process [M] the 4th Edition, Science Press,1986.7.

Design and Implementation of Valve Failure Signal Multi-channel Acquisition System Based on Acoustic Emission and Pipeline Ting Feng1,a, Jiande Wu*,1,2,b, Xuyi Yuan1, Yugang Fan1,2, Xiaodong Wang1,2 1Kunming University of Science and Technology, Kunming 650093 2 Engineering Research Center for Mineral Pipeline Transportation Yunnan, Kunming 650500 akingft@126.com, bwjiande@gmail.com Keywords: Acoustic emission; Multi-channel acquisition; Valve failure Abstract.
And because the vast majority of materials have characteristics of acoustic emission, acoustic emission is not so limited by the material[1].
This paper is supported by the foundation items: Project supported by Natural Science Foundation of China (Grant No. 51169007), Science & Research Program of Yunnan province (No. 2010DH004 & No. 2011CI017), Foundation of Kunming University of Science and Technology (No.
Journal of Nanjing Forestry University (Natural Sciences Edition), 29(6):91-94.(2005) [2] PROAKIS John, MANOLAKIS Dimitris G.Digital signal processing (4th Ed.)

Material and Methods Sample collection.
The monthly change of concentration was very obvious in PM2.5 and OC was mainly from fuel combustion including primary organic carbon (POC) from direct emission of combustion source and secondary organic carbon (SOC) from photochemical reactions of organic materials in the air.
Journal of Air & Waste Management Association, 53, 946-956
The Science of the Total Environment, 298, 65-79
Environmental Science and Technology, 40, 3148–3155

China 2 Shandong Institute and Laboratory of Geological Sciences, Shandong,Jinan, 250013, Shandong, P.
Materials and methods Site location and sample collection The locations of sampling sites are shown in Fig.1.
[6]J.Liu, Z.J.Cui, X.J.Song, S,F.Chen, N.Xu and F.Lu, Ecology and Environmental Sciences, 19(1),(2010) 86-91.
[8]D.M.Ge, B.P.Han and X.Zheng, Journal of Anhui Agri,Sci, 38(22),(2010) 11987一11989.In Chinese
[13]Y.Yang, M.Liu and L.J.Hou, Shanghai environmental sciences,21(9),(2002)530-532.

The indicators of time performance include the cycle of raw material purchase（A）, average manufacturing cycle（B）, average distribution time（C）, financial decision time (D), time of purchase plan formation （E）and time of production schedule formation （F）.
Acknowledgement The paper is supported by the National Natural Science Foundation of China (No.71171145), the National Natural Science Youth Foundation of China (No. 51005162) and the National 863 Plan Project of China((No.2012AA040910).
Technical Report, Nanjing: AI Lab., Department of Computer Science & Technology, Nanjing University, 2002
Journal of shanghai university(natural science ), 2007,13(5):598-604, (in Chinese)
Mechanical science and technology, 2001, 20(3):331-333, (in Chinese)

Research on Inspection System Formation of Cells in Gravure Cylinder base on Machine Vision He Zifen1,a, Zhan Zhaolin2,b, Zhang Yinhui1,c 1 Faculty of mechanical and electrical engineering, Kunming University of Science and Technology, China. 2 Faculty of materials science and engineering, Kunming University of Science and Technology, China.
[3] Chen Jinxi: Journal of Quanzhou Normal University, Vol. 6 (2009), p.38-41