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Materials and methods Materials Phragmites communis, Arundo donax, Typha oriental and Canna generalis are selected as the research objects in the experiment.
Wu: Chinese Journal of Applied Ecology, 5(2008), p.1131-1137
[3] Sasaki K, Ogino T, HodO, et al.: Materials Transactions, 2(2003), p.305-312
Li: Journal of Shandong Jianzhu University, 1(2011), p.55-60
Kuang: Journal of Lake Science, 2(2002), p.179-184.

Introduction Magnesium alloys are the most promising biodegradable materials and have recently attracted much attention [1].
Wang: Applied Surface Science.
Chen: Journal of Alloys and Compounds.
Han: Materials Letters.
Wen: Journal of materials science: Materials in medicine Vol. 18 (2007), p. 2275.

Nanoparticles are sized between 1 and 100nm and it may or may not exhibit size related properties that differ significantly from those observed in fine particles or bulk materials.
Hybrid materials are combined of two constituents at the nano meter or molecular level of inorganic and organic in nature.
X- Ray Diffraction Analysis: X-ray diffraction relies on the dual wave particles nature of X-rays to obtain information about the structure of crystalline materials.
Journal of Electro chemical Science, Vol. 7, (2012), pp. 10965 - 10975 [5] Asama.
Journal of Innovative Research in Science, Engg. and Tech., Vol. 2, Issue 12, (2013), pp. 7068-7072 [6] N.

The addition of many different materials on the thermal conductivity of cement based materials have been reported, including cellulose and glass fibre, mineral wool, polystyrene, urethane foam and vermiculite[4-8].
Björk, Construction and Building Materials. 23(5) (2009) 1775-1787
Materials and Design. 29(2) (2008) 344-352
[9] GÜL, O.G.R., Internatıonal Journal of Natural and Engineering Sciences. 4(1): p. 61-67
[12] Yuan, J., et al., Journal of Materials Science. 40(15) (2005) 3927-3932.

Therefore the materials around the tunnel such as soil, rocks and building materials mostly are complicated porous medium.
The chemical combination which is presented in the materials in molecular crystal type is strong.
American Society of Agronomy and Soil Science Society of American. 1972, 220
Journal of Water Resource & Water Engineering. 2006, Vol.6, pp:24-26
Study on Characteristics of Coupled Heat and Moisture in Porous Building Materials[D].

Zou, Theorical Model of Axial Force of 4-H Strip Mill — Study on the Axial Mechanical Behavior of 4-H Strip Mills (I), Journal of University of Science and Technology Beijing, Vol.15 (1993), No. 2, p176~182.
JIANG, A Design of a Third-order CVC Roll Profile, Journal of Material Processing Technology, Vol. 125-126 (2002), p645~648
Chen, et al., Research on CVC roll contour in 1700 mm tandem cold mill, Journal of University of Science and Technology Beijing, Vol. 25, S6 (2003), p1~3.
Li, et al., Comparative Analysis of Some Typical Roll Shapes with Roll Gap Variable through Roll Shifting, Journal of Northeastern University (Natural Science), Vol. 29, No. 6 (2008), p830~833.
Gere, Mechanics of Materials, Van Nostrand Reinhold Company, New York, 1973

Journal of Environmental Sciences(2010)P.225-229
Journal of Environmental Sciences(2007)P.652-656
Journal of Environmental Sciences(2011)P.1095-1103
Chinese Science Bulletin(2012)P.3218-3225
Nano-Materials and Technology[A].

Journal of Materials Processing Technology. 195 (2008) 171–177
Materials Charcacterization. 62 (2011) 1000 – 1006 [4] Dong Dong, Xiaobo Liu, Haixin Yu, Wencheng Hu.
Materials Chemistry and Physics. 88(2004) 27–31 [6] Yankun Liu, Yujie Feng, XiaoweiWu, Xiaguang Han.
RARE METAL MATERIALS AND ENGINEERING. 37(2008) 343-346 [8] Yang Peng fe,i Zhou Jicheng.
Ultrafine Particles preparation science and technology.

NOx reduction review on fuel alternative in cement kiln LIU HaiBing 1, a, Chen XiaoDong1, b and Gu Jun 1, c 1 Beijing Building Materials Academy of Science Research/State Key Laboratory of Solid Waste Reuse for Building Material, Beijing 100041, China alhblff@126.com, bcxd666@263.com, cgujun@bbma.com.
The use of MSW implies a reduction of the use of fossil fuels in cement kilns (Heidelberg,2007b; Heidelberg, 2007d; Hashimoto et al., 2010). [7] [8] In 2013, Beijing Building Materials Academy of Science Research conducted a test on RDF-5 in Tai Hang Qian Jing 3200t/d clinker.
Guidelines on Co-Processing Waste Materials in Cement Production. 2006
Sustainable Cement Production: Co-processing of Alternative Fuels and Raw Materials in the European Cement Industry
Water Science and Technology,46 (10).2002.p.255–258 [13] D.

Rotors are made of different materials, at the beginning by steel, cast-iron, composite materials and newly from ceramics that are machined to very close tolerances.
Both metallic materials were mechanically prepared, fig. 4, with dimensions necessary for the Amsler wear equipment.
Optical image of the experimental material with identification of four stains The friction is not an intrinsic property of materials; it depends generally on the tribological system which includes materials, but also the environmental conditions.
Prasad, Sliding wear response of cast iron as influenced by microstructural features and test condition, Materials Science and Engineering A. 456 (2007) 373-385
Ioniţǎ, Obtaining shape memory alloy thin layer using PLD technique, Journal of Mining and Metallurgy.