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Effects of Modification on Structure and Properties of Ramie Fiber/Polypropylene Composites Wen Lei1, a and Xiao-ming Jin1,b College of Science,Nanjing Forestry University,nanjing210037,China aleiwen67@163.com,bleiwen@njfu.com.cn Keywords: ramie fiber,polypropylene,composite,modification,structure,property Abstract.
Ramie fiber and polypropylene were used as raw materials,ramie fiber/polypropylene composites were prepared by compression molding process,the effects of treating the ramie fiber with silane coupling agent and compatibilizing the composite with maleic anhydride gafted polypropylene(MAPP) on the structure, melting and mechanical properties of the composites were studied，the effects of immersion time in water on the mechanical properties of the composites were also investigated.The results show that,both the modification with coupling agent and by means of compatibilizing agent can strengthen the interfacial bonding between the fiber and matrix in the composite,and also improve its thermal stability.All the modified composites have greater strengths and moduli than the unmodified ones when immersed in water for any periods,especially the impact strength of the MAPP compatibilized composite not only increases with immersion time in water dramatically,but also is improved from that of the
different composites means the material is more difficult to melt.So,it can be concluded from the result that both CRPP and MRPP have better thermal properties than RPP.
The water uptake of a material has relationship with its structure and properties,some researches have focused on the water absorption of natural fiber/polymer composites[4-5].
References [1] C Arup: Materials Science and Engineering: Part A,491(2008),p.492 [2] C K Hong.I Hwang, N Kim, et al:Journal of Industrial and Engineering Chemistry,14(2008),p.71 [3] F Corrales,F Vilaseca,M Llop,et al:Journal of Hazardous Materials,144(2007),p.730 [4] H N Dhakal, Z Y Zhang, M O W Richardson:Composites Science and Technology,67(2007),p. 1674 [5] A Espert,F Vilaplana,S Karlsson:Composites,Part A,35(2004),p.1267 [6] A C Karmaker:Journal of Materials Science Letters,16(1997),p.462

The addition of both materials can improve concrete properties and reduce the cost of DSCC production.
The incorporations of both MIRHA and fly ash in DSCC as cement replacement materials are considered as a new type of concrete.
Both MIRHA and fly ash were used as cement replacement materials.
Lee, “Ultra High Strength Steel Fiber Reinforced Concrete For Strengthening of RC Frames”, Journal of Marine Science and Technology, Vol. 15, No. 3, pp. 210-218, 2007
Islam, “Strength Development of Mortar and Concrete Containing Fly Ash: A Review”, International Journal of the Physical Sciences, Vol. 6, No. 17, pp. 4137-4153, 2011

., Beijing, 100013, China 2 Tiandi Science&Technology Co.
Tooth body is 42CrMo steel,elastic modulus of 212 GPa, poisson's ratio of 0.28, the density of 7850 kg/m3; carbide-tipped materials are YG series carbide, elastic modulus of 600 GPa, poisson's ratio of 0.22, the density of 14600 kg/m3.
China Safety Science Journal,2006.16(11),14-17
Journal of Heilongjiang Institute of Science and Technology,2009,19(3):22 2-224
Journal of Liaoning Technical University: Natural Science Edition,1999,18(6):649-652

Introduction Industrial and mining enterprises need to produce and transport a large number of bulk materials, such as coal mine, coal washery and power plant, etc.
According to the relationship between volume and depth, the actual volume and weight of bulk materials with dynamic measurement system can be calculated.
According to the characteristics of measured material, and irregular shape of the materials’ contour, we need to calculate the parallax value of each pixel in the image in order to accurately calculate the volume, but it is high complexity to achieve for this dense matching algorithm and needs abundant calculation.
Acknowledgments This research was supported by Beijing Board of Education Science and Technology Innovation Platform Project (PXM2012_014225_000024) and subject funds of Beijing Polytechnic College (bgzyky2012114).
Chinese Journal of Computers, 2000,23(11): 1130-1139

Kokubo, Science Reports of the Tohuko Imperial University, Japan, 21 (1932), p. 256 [2] G.
Materials Research, 10 (1995) 1, p. 101 [7] S.
Materials Research, 16 (2001) 7, p. 2091 [9] J.
Scholtes, Materials Science Forum, 404-407 (2002), p. 349 [12] J.
Pharr, J. of Materials Research, 11 (1996) 3, p. 752

In recent years, researches on dewpoint corrosion mainly focus on materials in laboratory trial.
Test section is made of several different materials which were welded together.
Therefore, experiment did research on metal corrosion rate of different materials with temperature changing to identify materials' tempera-ture range in engineering application, as showed in Figure.3-5.
Anti-Corrosion Methods and Materials, 2004,51(3):173-188
Oil & Gas Journal,2010,108(7):44-48

Abstract.Reinforced soil has been among the most effective soil modification materials.
Clay was used as sub grade material.
The advances of these materials have usually been considered by an increase in their applications.
Material Composite materials consist of two parts.
References [1] Akbulut, S., Arasan, S. and Kalkan, E. (2007) Modification of clayey soils using scrap tire rubber and synthetic fibres, Journal of Applied Clay Science 38, 23-32

Compared with the traditional metal materials, SMA has many unique mechanics properties.
We consider the isotropic and rate-independent materials.
Mechanics of Materials.2004, 36:865-896 [2] Lagoudas DC，Entchev PB et al.
Journal of Engineering Materials and Technology.1999, 121: 44-45 [5] Moyne S，Boubakar ML，Lexcellent C.
Materials Science and Engineering A, 2008, 481-482:343-346 [15] Reese S, Christ D.

Geopolymer materials combined with a soil and a special agent can use fly ash, furnace slag or which are waste materials of industry. [1-5] Geopolymer is the mineral polymers resulting from geochemistry or geosynthesis.
The materials can be produced by nature stone, soil, aggregate and hardening agents.
MATERIALS AND METHODS Fly ash.
Journal of Materials Science, 42(9), (2007), p. 2917–2933
Mustafa Al Bakri. et al., The Effect Of Alkaline Activator Ratio On The Compressive Strength Of Fly Ash-Based Geopolymers, Australian Journal of Basic and Applied Sciences, 5(9), (2011), p.1916-1922.

Crankshaft rotates round its axes of main journal in opposite direction.
Relative Motion Analysis According to the characteristic and request of relative motion invariability, model diagram of motion analysis for arbitrary point M of connecting rod journal surface, shown as Fig.2, is set up, where O is rotary center of crankshaft (main journal), O1 is center of connecting rod journal, l is distance between center of main journal and connecting rod journal, r is radius of connecting rod journal, n is rotational speed of crankshaft, S and f are the reciprocating amplitude and frequency.
Acknowledgements This project is supported by technique innovation fund of third science and technology enterprise (2003) with ministry of science and technology and finance ministry(03C26211300493) and science and technology foundation of ShanXi(2007031158) References [1] S.C.
Yang: Key Engineering Materials， Vols. 359-360(2008), pp.394-398
Advanced Materials Research，Vols.53-54(2008), pp.15-19.