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Fig.1 Schematic diagram of numerical model SOIL-CONTRETE materials are used as medium of rock mass.
G and K are shear modulus and volume modulus of the model materials respectively.
E and μ respectively represent the elastic modulus and Poisson's ratio of the bolt materials.
International Journal of Rock Mechanics and Mining Sciences, 2006, 43(4):634-639
Journal of PLA University of Science and Technology，2007，8(6)：582–588.

Service based E-Learning System Model using IRT Hae-Gill Choi1, Hwa-Young Jeong2 1 Dept. of Information and Communication, Kyung Hee Cyber University, Hoegi-dong, Seoul, 130-701, Korea 2 Humanitas College, Kyung Hee University, 1 Hoegi-dong, Dongdaemun-gu, Seoul, 130-701, Republic of Korea ahgchoi@khcu.ac.kr, bhyjeong@khu.ac.kr (Corresponding author) Keywords: Learning materials, E-learning system, Learning system model, IRT, Web service.
This work is to support learning materials to user who is students or learner by service based learning process on the internet.
And all of learning process logic from the learning provider can support their material using the internet as WSDL and SOAP forms.
, British Journal of Educational Technology 36(3) (2005), p.501-512 [2] M.
El-Seoud, Web Services Based Authentication System for E-Learning, International Journal of Computing & Information Sciences Vol.5, No.2, August (2007) [10] Kelly Wauters, Piet Desmet, Wim Van Den Noortgate, Item difficulty estimation: An auspicious collaboration between data and judgment, Computers & Education 58 (2012), p.1183-1193

Construction materials using of earth building.
Modifications of raw-soil materials.Most of raw-soil materials’ strength is relatively low and earthquake resistant capacity is rather inferior.
Binder materials should be colligated at intersections.
Journal of Anhui Agricultural Sciences, 2010,38(8):4327-4329.
Journal of Anhui Agricultural Sciences, 2010,38(32):18451-18452.

Citric acid is one of high-efficient retardants usually used in gypsum-based materials due to its outstanding retarding effect even at a low dosage.
Experiment Materials.
Brockner: Zement-Kalk-Gips, 1990, (9): 219~220 [2] Dirk Bosbach, Michael F.Hochella Jr.: Chemical Geology, 1996, (132):227-236 [3] Manjit Singh and Mridul Garg: Cement and Concrete Research, 1997, (6): 947~950 [4] K.A.Pavlov, B.A.Dmitrevskii: Russian Journal of Applied Chemistry, 2003, 76(9): 1408-1413 [5] A.J.LEWRY: Journal of materials science, 1994, (29): 6085-6090
The science of binding materials [P].
[9] Weizhuo Zhong：Journal of inorganic materials, 1997, (1):11-16.

Fig.1 PBT nonwoven fabrics with melt-blown (diameter<5μm) Experimental Materials The trade model of the PBT chips is Celanex PBT 2008.Its [ŋ] value is about 0.57dl/g.
Journal of polymer science.
Journal of applied polymer science.
Journal of biomaterial science-polymer edition.
Journal of east china unversity of science and technology.

Materials and experimental procedures Experimental material Test material came from 4.55 mm hot-rolled plate based on CSP technology by one domestic plant.
References [1] C.P.Reip, S.Shanmugam, R.D.K.Misra, Materials Science and Engineering, A, Vol. 307 (2006), p. 424 [2] G.Erdem, Y.Taptik, Journal of Materials Processing Technology, Vol. 17 (2005), p. 170
Journal of Materials Science & Technology, Vol. 7 (2002), p. 18 [8] Y.L.Kang, H.Yu, J.Fu, et al.
Materials Science and Engineering A, Vol. 265 (2003), p. 351 [9] SUN Hao, REN Hui-ping, JIN-Zili, et al.
Transactions of Materials and Heat treatment, Vol. 30 (2009), p. 54

Journal of Materials Research, 2002, 17(2): 291-301
Journal of Materials Science: Materials in Electronics, 2000, 11: 33-43
Materials Science and Engineering A, 574, 60–67
Journal of Electronic Materials, 39(11), 2382–2386
Journal of Materials Science & Technology, 31(2015), 252–256

Raw materials were mixed into the mortar grinding, after weighing, fit it into the crucible.
With containing a small amount of phase of FeSi2 in raw materials, phase of FeSi2 diffraction peak enhanced after the reaction, and after the reaction there is some phase of FeSi, which is indicating that the silicon in the raw materials did not react with B2O3, only the phase transition occurred after melt.
Journal of Iron and Steel Research, 2011, 18(6): 17~22
Journal of Iron and Steel Research, H1991, (2H): 7
Journal of University of Science and Technology Beijing, 2002, 9(3): 170~174.

Materials and Methods Main Materials.
Park: Journal of Food Science Vol.173 (2008), p.
Zhang: Journal of Plant Resources and Environment, Vol. 9(2000), p. 5-8 (in Chinese)
Agboola: Journal of Food Science, Vol.76(2011), p.
Wang: Chinese Agricultural Science Bulletin, Vol.24(2008), p. 124-127

Experimental 2.1 Materials and the preparation process The filler used in this study was Kevlar pulp (Type 1F538, density, 1.41 g/mm3, diameter, 14 um, average length, 1.7 mm, manufactured by DuPont Inc., Brownslane, KY, USA).
The applied load was mainly borne by Kevlar fiber and the wear resistance of the materials has been greatly improved by incorporating Kevlar pulp. 4.
Conclusion The incorporation of Kevlar pulp into PEI can increase the tensile properties of the composite but either increase or decrease friction and wear properties of the materials, depending on the volume fraction of Kevlar.
Shanghai Municipal Natural Science Foundation：11ZR1413600.
Narayanan, Viscoelastic properties of Kevlar-29 fabric tape strength member , Mechanics of Materials, Volume 40, Issue 11, November 2008, Pages 949-960 [3] Li-Qiang Shen, Zhi-Kang Xu, Zhen-Mei Liu, You-Yi Xu, Ultrafiltration hollow fiber membranes of sulfonated polyetherimide/polyetherimide blends: preparation, morphologies and anti-fouling properties, Journal of Membrane Science, Volume 218, Issues 1-2, 1 July 2003, Pages 279-293 [4] Guijun Xian, Zhong Zhang, Sliding wear of polyetherimide matrix composites: I.