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The article aims to discuss the dilemma of controlled use and ban asbestos, and present the progress of the search for alternative materials to asbestos in Brazil.
Introduction This article aims to present the development of studies on alternative materials to asbestos, financed by Brazilian funding agencies for science, technology and innovation.
Although asbestos be listed among the materials that may pose risks to human health, it is handled in different ways, both legally and economically in many different countries.
The Search for Alternative Materials in Brazil The agencies that support research in Brazil funded several projects of construction materials, especially for replacing asbestos.
White, Asbestos and the Future of Mass Torts, Journal of Economic Perspectives, vol. 18 (2), pp 183–204 (2004) [9] H.

But if nitrizing is carried under normal pressure, reduction process using tubular furnace, and materials putting on ceramic plate, the raw material layer cannot be thicker (less than 5 millimeter), otherwise the temperature cannot be lowered, time cannot be shorten, the nitrizing will be incomplete, and the grain sizes can be larger.
It saves energy, reduces reaction time, increases layer thickness of loaded materials.
Acknowledgements Foundation item: National High-Tech Research and Development Program of China (863 Program)（2003AA302130); National Natural Science Foundation of China （Grant No50272002）(Grant No50372001); References [1] Da-Yung Wang ,Ko-Wei Weng: Surface and Coatings Technology, Volume 156, Issues 1–3, 1 July 2002, P. 195-200 [2] M．D．Aguas, A．M．Nartowski, I．P．Parkin, et a1: Journal of Materials Chemistry, 1998, 8(8): 1875-1880
T.: Materials Research Bulletin,1999,34(3):p.433一436 [6] K.Hirota,Y.Takano,M.Yoshinaka,etal: Joumal of the Alneriean Ceramic Soeiety,2001,84(9):p.2120一2122 [7] Yiaogang Li, Qian Gao, : Journal of Inorganic Materials, 2003, 18(1): p.233-237
[8] Atsumi N, Yoshioka K, et al.: Materials Transactions,1993,34(12):p.1212一1216 [9] Ren R M, Yang Z.G, Shaw L.L : Nanostructured Materials,1999,11(l):p.25一35 [10] Guo Li , Preperation and Study of high purity chromium nitride powder, (MS: University of South Central, china, 2007.): p13, 46 [11] Yingran Zhou, Shoushan Gao, Kaiming Wang, Chuangeng Wen, Xiaoqi Li etc., China, Patent number: ZL 01 1 27978.8 : （2004） [12] J.Szekely et.al.Gas-Solid Reations Academic.Press(1976).P.41-45 [13] Qingyin Ge, reaction dynamics of gas-solid reaction, Atomic Energy Press, 1991.6 .P.31-35

Morin: Material Science and Engineering A358 (2003), p. 350-355 [6] E.
Morin: Material Science and Engineering A378 (2004), p. 115-118 [7] Y.
Materials Research Society of Japan, Vol. 31(2006), p. 295-298 Variation Variation On time Off time Time [ms] Resistance [W] 0 200 400 600 800 1000 18.5 19.0 19.5 18.5 19.0 19.5 Off-time : 0.12 sec.
Materials Research Society of Japan, Vol. 32 (2007), p. 635-638 [13] Y.
Materials Research Society of Japan, (in print).

Therefore, heavy metal pollution of soil is now a major issue in the study of environmental science.
Material and Methodology 1.1 Experimental Samples Samples for experiment are taken from Huanggua Mountain in Yongchuan District of Chongqing City.
Acknowledgment Foundation Item: Supported by Natural Science Foundation of Chongqing (cstc2011jjA1236); Key Laboratory of Water Environmental  Restoration ,Chongqing University of Arts and Sciences References [1] Ye Chen,Li SiYue,Zhang QuanFa.Sources and assessment of heavy metal contamination in water-level fluctuation zone of the Three Gorges Reservoir,China[J].Chinese Journal of Eco-Agriculture, 2011,19(1):146~149(In Chinese) [2] Li Hongxia,Lin Wenbo,Li Yuqing,etal.Simulation and Verification for Model of Phytoremediation on Heavy Metal Contaminated Sediment[J].Environmental Science, 2011, 32(7): 2119～2124(In Chinese) [3] Jiang Bin.Hyperaccumulator and Its Application in the Control of the Soil Polluted by Heavy Metals[J].Journal of Zhaotong Teacher s College,2002,24(5):32～34(In Chinese) [4] An ZhiZhuang,Chen TongBin,Lei Mei,etal.Tolerance of Pteris vittata L.to Pb,Cu and Zn[J].Acta Ecologica Sinica,2003,23(12):72594～2598(In Chinese) [5] Wu Guirong.The Ecophysiological and Soil
[8] Zhang Yinqiu,Tai Peidong,Li Peijun,etal.Effects of cadmium stress on the growth and physiological characteristics of Tagetes erecta L[J].Chinese Journal of Environmental Engineering, 2011,5(1):195~199(In Chinese) [9] Xu Qinsong,Shi Guoxin,Wang Xue,etal.Generation of Active Oxygen and Change of Antioxidant Enzyme Activity in Hydrilla Verticillata Under Cd,Cu and Zn Stress[J].Acta Hydrobiologica Sinica, 2006,30(1):107~112(In Chinese) [10] Liu Jianxin.The Influence of Hg2+ on Seedlings Growth and Physiological Metabolism of Pea[J].Journal of Ningxia University(Natural Science Edition),2005,26(1):67~70(In Chinese) [11] Yuan Min,Tie Boqing,Tang Meizhen.Effects of Cd,Pb,Cu,Zn and As single pollution on Chlorophyll Content and Antioxidant Enzyme Systems of Eulaliopsis binata[J].Chinese Journal of Soil Science,2005,36(6):929~932(In Chinese) [12] Yang Dan-hui.The Effects of Heavy Metals on the Structure and Function of Photosynthetic Membraned in Higher Plants[J].Chinese Bulletin of Botany
Druce Seedlings[J].Chinese Journal of Applied & Environmental Biology,2009 ,15(3):308~312(In Chinese) [19] Ma Haitao,Li Xiaocen,Guo Zhiyong,etal.Effect of the Toxicity of Zn,Pb and Cd on Wheat Seedling Growth[J].Journal of Anhui Agricultural Sciences,2007,35(3):647~648(In Chinese) [20] Zhu Yunji, Wang Chenyang, Ma Yuanxi,etal.Effect of arsenic stress on the growth and metabolism of the wheat root system[J].

Materials and methods Seed and Anaerobic Inoculum.
The digesters were kept in the thermostat water bath with a constant temperature of (55±1) ℃ to maintain constant reaction temperature, and the reactors were shaken manually once a day to get the materials fully mixed.
It need not add additional material to adjust the pH.
Journal of Environmental Sciences. 23(2011) 1257-1265
Chemical Engineering Journal. 133(2007) 335-342

Based on the build time, material consumption and part quality obtained, thebest support structure of any given model is experimentally found.
RP part without raft layer Table 3 Conclusion SL No Factors Support Materials SP SH SR 1 Part Accuracy High High High 2 Raft Layer Yes No No 3 Material Low High High 4 Build Time Low High High 5 Post Process Easy Difficult Moderate 6 Wastage Low High High 7 Feasibility Yes Yes Yes Conclusion In this work, samples of bridges and overhangs were printed with different support structure to study the quality and effects of individual structure to overall part quality and RP performance.
International Journal of Machine Tools and Manufacture 2004;44:585–94
On the integration of layered manufacturing and material removal processes.
[9] Chandru, V and Manohar, S ‘G-WORP: a geometric workbenchfor rapid prototyping’ PED-Vol 68-2 Manufacturing Science andEngineering Vol2 ASME (1994) pp 569-574

Materials and Methods Experimental device and raw materials The experimental device used in this study is a closed composting reactor as shown in Fig. 1.
The daily loss of mixture by sampling was accounted in material balance calculation in this study.
IRT0853), Baoji University of Arts & Sciences (ZK2559, YK1030).
Chinese Journal of Environmental Engineering ,Iss. 01(2008), p. 97-100 [8].
Journal of Safety and Environmental Iss. 02(2008), p. 43-46 [18].WANG H.

Struthers: Journal of Sound and Vibration Vol. 281(2005), pp. 357-373
Genin: Journal of Mechanical Engineering Science Vol. 218(2004), pp. 1091-1101
Ji: Journal of Vibration and Engineering Vol. 5 (1992), pp. 78-83
Wang: Journal of Sound and Vibration Vol. 307(2007), pp. 250-64
Zhou: Journal of Applied Mechanical Vol. 75(2008), pp.0610181-12

The processing of ultrasonic-assisted laser machining with water could be extended in more materials and fields.
Matovic, Mechanical properties of silicon nitride-based ceramics and its use in structural applications at high temperatures, Materials Science and Engineering: A .527 (6) (2010)1314-1338
Chen, Experimental studies on quality of material surface applied laser-chemical combined etching, Chinese Journal of Laser. (1) (2010) 281-283
Chen, Study on Ultrasonic Assisted Laser under Liquid Processing Platform, Advanced Materials Research. 765 (2013) 3090-3093
Yu, Oxidation Mechanism Study of Silicon Nitride, Aerospace Materials & Technology. (1) (2010) 28-31

Materials The ores used for the experiment were obtained from the dump of Dexing Copper Mine, in Jiangxi province of China.
Acknowledgments The authors would like to acknowledge the financial support for this work provided by the National Natural Science Foundation of China (50934002, 51074013, 51104100), the Program for Changjiang Scholars and Innovative Research Team in Universities (IRT0950), and the project supported by China Postdoctoral Science Foundation (2012M510007).
Chemical Engineering Journal, 80 (2000) 221-231
Journal of Petroleum Science and Engineering, 42 (2004) 15-28
Journal of Contaminant Hydrology, 77 (2005) 67-89.