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Research on properties of low grade cement-based composite materials modified by silica fume XU Zi-fang*, ZHANG Ming-xu, Li Jin-hua Department of Material Science and Engineering, Anhui University of Science and Technology, Huainan china 232001 [Corresponding author]:XU Zifang,PhD, associate professor,Tel:18855406089; E-mail: zhfxu@aust.edu.cn Key words: silica fume; cement-based material; hydration products ; durability Abstract: In order to notably improve the mechanical properties and durability of low-grade cement-based material, superfine silica fume was used to modify the cement-based composite based on special perfomance and effects of nano powder.
Experimental 2.1 Main raw materials (1) cement: composite portland cement of 32.5, the chemical composition and mineral composition of cement shown in tab.1.
[5]Mo Liwu,Deng Min.Cement and Concrete Research, 2006,36（3）：1992-1998(in chinese) [6]DU Ying-ji,HAN Su-jian,YAO Ru-fang.Journal of Northwest Sci-tech University of Agriculture and Forestry ( Natural science edition ), 2004,7(7)：107-110.
New Building Materials, 2001(11):4-7.
(in chinese) [11]SHAOHui-fang,LIUChang-sheng,HUANGYue.Journal of Inorganic Materials, 2001,16（5）:933-938.

The article deals with testing materials for using in enthalpy exchangers.
Zhang, Membrane-based Enthalpy Exchanger: material considerations and clarification of moisture resistance, Journal of Membrane Science 189 (2001) 179–191 [5] E.
Zhang, Evaluation of moisture diffusivity in hydrophilic polymer membranes: A new approach, Journal of Membrane Science 269 (2006) 75–83 [9] L.Z.
Pei, Heat and moisture transfer in application scale parallel-plates enthalpy exchangers with novel membrane materials, Journal of Membrane Science 325 (2008) 672–682 [10] ASTM: E96. 2000.
American Standard Test Methods for Water Vapor Transmission of Materials, American Society for Testing and Materials, 842-849 [11] P.

The simulation results based on the different rubber materials reveal that the selection of the shape of the cavity depends on the material characteristic.
The materials include the Chlorosulfonated polyethylene rubber and steel, and the perforation coefficient is 0.2 , 0.3 , 0.4 respectively.
As shown in Fig.7, the difference between materials leads directly the difference between the cavity structures.
Tab.1 Optimized result of different materials in the same request materials Maximum of reflection coefficient Mean of reflection coefficient Average deviation of reflection coefficient nitrile-butadiene rubber 0.0600 0.0514 0.0045 Butyl rubber 0.0625 0.0512 0.0048 Chlorosulfonated polyethylene rubber 0.0600 0.0516 0.0048 Fig.6 Reflection coefficient curves of different materials in the same request Fig.7 Perforation coefficient curves of different materials in the same request Conclusion Through the above simulation analysis, we will draw the following conclusion: 1.
Journal of Marine Science and Technology, 2007, 15(4)：351-359

Effects of Carbon Fiber Dispersion on Bending Property of Cf/SiC Brake Materials Bolin He1,a, Yingxia Yu1,b, Jia Sun1,c, Jing Liu1,d and Jianping Shi2,e 1School of Mechanical & Electrical Engineering, East China Jiaotong University, Nanchang 330013, China 2China academy of railway sciences, Beijing 100081, China ahebolin@163.com, byyxhbl@163.com, cjiasun1985@163.com, dliujing072321@163.com, etkysjp@163.commail Keywords: Cf/SiC brake materials; sintering; carbon fiber dispersion; bending property.
It is urgent to find new braking materials to satisfy the rigorous using environment.
This method dose not introduce new materials, and easy to operate.
Fig.5(b) shows the disperse fiber strength composite materials.
Huang, Progress in the resaerch of train brake friction materials, Materials Science and Engineering, 17 (1999) 91-93(In Chinese)

Acknowledgements This paper is supported by the Soft Science Research Project of Henan Province (092400440088) and the Major Special Project of Xuchang University (2010ZD007).
References [1] George,G.．Slack resources and the performance of privately held firms．Academy of Management Journal, 2005,48(4):661-676
Journal of Business Research, 2004,57:565-574
Strategy Management Journal, 2003, 24(13): 1249-1263
The 4th International Conference on Management and Service Science,2010.

Damage Analysis for Quasi-Birttle Materials of CT Image under Uniaxial Compression Cheng Yi 1, a, Hongguang Zhu 2, b, Lizhen Liu 3, c 1, 2, 3 State Key Laboratory of Coal Resources and Safe Mining, CUMT, Beijing, China, 100083 ayicheng312@tom.com.cn, buu_gr@qq.com, c 360268617@qq.com Keywords: Damage ; CT(Computerized Tomography); Rd index; quasi-brittle; materials Abstract.
In the damage research before on the CT image of quasi-brittle materials such as concrete, the damage evolution is often described by the change of average CT values or image threshold segmentation method.
But for the brittle materials, it is difficulty to distinguish the internal damage from the CT information before macro-cracks appear.
Vol. 313 (1999),P.293 [4] Lawer J S, Keane D, Shah S P :ACI Materials Journal.
Vol.202(2006),P.21 (In Chinese) [12] Fen Li, Zhida Li, Junan Gong:Natural Science Journal Of Xiangtan University.

New materials in nuclear fusion reactor Fusion candidate structural materials mainly include the austenitic stainless steel (represented as the first candidate materials, e.g., PCA material), ferritic/martensitic steel (e.g., HT-9), vanadium alloy (e.g., VCrTi), and SiC/SiC composite materials.
Summary With the further development of materials science and nuclear technology, new material plays a more and more important role in the new nuclear reactor, the ultrahigh temperature, strong radiation, and strong corrosion service environments in new nuclear reactor require higher performance of the new material, now there is no material completely meet the requirements, the researchers need to do further work to solve some common problems in materials, such as the high temperature strength, creep resistance, irradiation damage resistance and corrosion resistance, etc., so as to develop new materials with excellent comprehensive properties.
Xu: Structural materials in fast reactor, J.
Chinese Journal of Nuclear Science and Engineering. 28 (2008), p. 129-133
Journal of Nuclear Materials. 371 (2007), p. 37-52

Materials like bamboos, leaves, and miscellaneous agricultural and industrial wastes [15].
Although comparatively, the cost of composite material was sometimes higher than solid materials, the same was offset by easy availability, longer durability and by better aesthetic appearances.
M: Development of Methods of Evaluating the Machining Qualities of Wood and Wood Based Materials.
News Line 6, 4(2007) [26] Rametsteiner, E: Gerhard Weiss: Forest Policy and Economics, (8), 691-703, (2006) [27] Marra, G: Overview of Wood as Material, Journal of Educational Modules for Material Science and Engineering, 1(4) 699-710, (1979) [28] Dinwoodie.
C: Expanding Horizons of Wood Science in India, Journal of Indian Academy of Wood Science, New Series, Vol. 2(1), (2005)

Regardless of the size of these flaws, they can reduce the strength of rock materials [1].
Transparent brittle materials are able to solve this problem.
Material selection This paper chooses PMMA and glass as the test materials.
This method applies to materials which can be liquefied such as glass and resin.
It must be cautious to generalize the result to rock materials.

The maximum stress points occur at the transition of the crank arm and main journal.
Analysis for Affecting Fatigue Strength of Diesel Engine in Science Edition of West China University Journals.
Influence of Crankshaft Strength Using the Boundary Conditions of Finite Element Method in Anqing Teachers College Journals (Natural Science) (2006) [5] Z.
Science Press (2006) [7] Editorial Board of Diesel Engine Design Manual.
Infinite Element Analysis of G170 Diesel Engine Crankshaft in Guangxi University (Natural Science), (2000), 25 (2): 101-104 [9] L.