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Introduction In recent years, investigating geotechnical materials with CT technique is the hot topic.
For the cone beam with certain width, each image is derived from scanning a certain thickness, and each image reflects the average linear attenuation coefficient of a certain thickness materials.
Since the linear attenuation coefficient of materials correspond to the density, the CT images reflect the changes of material density .
The materials with known density, such as ABS, POM, PTFE, polyethylene, polypropylene, and nylon, were selected, which are made into Φ25 × 30mm cylinder.
Chinese Journal of Geotechnical Engineering, 2000, 22(1),p.49-54.

Compression Deformation Behavior of AZ91D Magnesium Alloy at Elevated Temperature CHAI Yuesheng1,2* CHEN Yong-zhe1,2 LIU Wen-feng1,2 SUN Gang1,2 1 Shanxi Magnesium and Magnesium alloy Engineer Technology Research Center 2 School of Materials Scienceand Engineering, Taiyuan university of science and technology Taiyuan Shanxi China 030024 Cys5912@126.com, chenyz126@163.com, lwfyx@163.com, sxmagnesium@163.com Keywords: Magnesium alloy; Hot compression deformation; Deformation activation energy Abstract: Hot compression tests of AZ91D magnesium alloy were performed on Gleeble1500 ranging from 0.001 to 1 s-1 and deformation temperature ranging from 200 to 400℃.
Thus, it is viewed as the “one of the most promising structural engineering materials in the 21th century”[1-4].
(2) Through the analysis and calculation, some basic material factors can be established.
Material Science forum,2000,350/351:159-170
The Chinese Journal of Nonferrous Metals, 2009,19(10):1720-1724.

The material is 2024-T3 aluminum alloy, of which yield strength is 374 MPa and fracture toughness [5] is 3004.1.
Supported by the Nation Nature Science Foundation (No.10577015) REFERENCES [1] Fang Wang, Wei Cheng Cui, Jeom Kee Paik.
Tu, Effect of residual stresses on the strength and fracture energy of the brittle film: Multiple cracking analysis[J], Computational Materials Science, Volume 50, Issue 1, November 2010, P 246-252 [3] T.
Swift,Damage Tolerance Capability, International Journal of Fatigue[J].1994,Vol. 16, No. 1, 75-94
Fatigue&Fracture of Engineering Materials&Structures, 1998, Vol. 21, 1147-1156 [8] Xiangyang Deng, John W.

Experiments Test Materials and Samples.
The test materials was super 13Cr tubing steel which Chemical compositions are elements (wt.%): C 0.029,Si 0.21,Mn 0.45,P 0.0016,S 0.0012,Cr 13.3,Mo 1.92,Ni 4.85,V 0.025,Ti 0.036,Cu 1.59. the size and specification of specimen was shown in fig.1, which surface should polished to 800# with sand paper, using acetone altrasonic cleanout, then alcohol cleanout, electric blower drying.
The SSRT fracture macro morphologies of super 13Cr tubing steel in different pH values 3.5% NaCl solution is shown in fig.6, the super 13Cr tubing steel specimens fracture were obvious necking phenomenon, there were obvious plastic deformation, with pH value decreased, the specimens fracture area increased, the brittleness of materials increased, plasticity debased.
References [1] Zhang Yaming:Corrosion Science and Protection Technology,vol.21(2009),P.499.In Chinese [2] Liu Kebin:Chemical Engineering of Oil and Gas,vol.36(2007),P.222.
In Chinese [3] Lu Xianghong:Journal of University of Science and Technology Beijing,vol.32(2010),P.207.

Pasta.[5] studied fatigue cracks growth through particulate clusters in polycarbonate materials.
Therefore shocks to PC materials and workpieces should be avoided.
Ranganathaiah, Influence of gamma irradiation on the formation of methanol induced micro-cracks in polycarbonate, Journal of Materials Science, 2003, 38, 1431- 1438
Pasta, Fatigue crack growth through particulate clusters in polycarbonate materials, Engineering Fracture Mechanics, 2011, 78, 397-411
Ding et al., The laminated cracking mechanism for polycarbonate thin-wall part, Polymer Materials Science and Engineering, 2008, 24(11), 115-118

Kang* School of Materials Science and Engineering, Chonnam National University, Gwangju, 500-757,Korea ( E-mail : skhong@chonnam.ac.kr) * Materials & Components R & D Team, Korea Institute of Industrial Technology, Gwangju, 500-460, Korea Abstract It has been well known the effect of ion-bombardment is controlled by self-bias voltage around a substrate, and it is increased by high RF power and vacuum, but decreased with a substrate size.
Introduction Physical vapour deposition(PVD) there are two fundamental transfer processes of the coating material into the vapour phase: evaporation and sputtering.
Metal oxide like as TiO2, SiO2, Al2O3 ZrO2, Ta2O5 etc. films are generally evaporated with suboxide TiO, SiO…by electron beam heating and then the dissociated materials are partly recombined during codensation.
Rahman, et al.: Journal of physics and chemistry of solids 60(1999), pp. 201 [6] S.
Moon, etc al., "Optical and Microstructural properties of TiO2, Al2O3 and SiO2 single layers deposited by plasma assisted E-beam evaporation" Materials Science Forum, Vol. 449-452, (2004) pp. 961-964,

Materials used and experimental procedure 316L stainless steel is one of the promising structural materials for micro chemo-mechanical systems working at high-temperature and high-pressure environment, because of its excellent mechanical properties, corrosion and oxidation resistance at high temperature.
The materials testing machine (EHF-EG250-40L) equipped with a temperature- controlled furnace for high temperature tests at a crosshead speed of 0.2mm/min was used to perform the tensile tests at two temperature levels: ambient and 550°C.
Increasing the bonding temperature allows the growth of grains of the base material resulting in the reduction of the strength and toughness of the base material.
Acknowledgements This project is supported by the National Natural Science Foundation under contract Nos. 50225517 and 50475068.
Lechler: Journal of Nuclear Materials Vol. 283-287 (2000), pp. 1196-1200 [6] S.T.

References [1] Otsuka, Wayman: Shape memory materials (Cambridge Univ.
Miller, et.al.: Materials Science and Engineering Vol.
Liu: Journal of Alloys and Compounds 297 (2000), p. 114
Uchil , et.al.: Materials Science and Engineering A251 (1998), p. 58
Wu, et.al.: Materials Letters Vol. 46 (2000), p. 175.

Citation & Copyright (to be inserted by the publisher ) Hydrophilicity and Bactericidal Effects of TiO2 Thin Films Prepared by RF Sputtering Yo-Seung Song 1, Seon-Hwa Kim 2, Bae-Yeon Kim3 and Deuk Yong Lee 4� 1 Department of Materials Engineering, Hankuk Aviation University, Koyang 412-791, Korea 2 Division of Materials and Chemical Engineering, Soonchunhyang University, Asan 336-745, Korea 3 Department of Materials Science and Engineering, University of Incheon, Incheon 402-749, Korea 4 Department of Materials Engineering, Daelim College of Technology, Anyang 431-715, Korea Keywords: TiO2 thin film, Sputtering, Bactericidal effect, E. coli, Hydrophilicity, Roughness Abstract.
Wang et al. [8] reported that the UV illuminated TiO2 thin film can be used as the self-cleaning construction material because the contact angle of the water decreased gradually and finally became almost zero, so called super-hydrophilicity.
Survival ratio of E. coli, hydrophilic properties, phase analysis, surface roughness and morphology were experimentally examined to elucidate the feasibility of TiO2 on the antibiotic materials
Morphology, thickness, phase and microstructure of the films were measured by using AFM (M5, PSI, Japan) and XRD (MX-18HF, MAC Science, Japan).
No Ti peak was observed at an Process variable Values Background pressure [torr] 6×10-5 Working pressure [torr] 3.3×10-3�1.2×10-2 Target Ti Substrate Si O2 gas flow rate [sccm] 1�10 Ar gas flow rate [sccm] 20 DC power [W] 300�400 Source to substrate distance [cm] 5 Time [min] 30 Journal Title and Volume Number (to be inserted by the publisher) oxygen partial pressure of 40%.

A New Buck/Boost Bidirectional DC/DC Converter Base on Soft Change Current Network Dianlong Wanga, Dongjie Shenb School of Material Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China auc3875@163.com, b694174280@qq.com Key words: Buck/Boost; soft change current; Saber; bidirectional DC/DC converter Abstract:There is a problem about high current and voltage spikes in Buck and Boost converters,it will damage main power devices .Therefore, a novel Buck/Boost bidirectional DC/DC converter based on soft change current (SCC) network was given, and Buck and Boost modes ware particularly analyzed.Groups parameters of L/C/D are selected and simulated with Saber software.
Acknowledgments This work was financially supported by the National Natural Science Foundation (51205106), the Hebei Natural Science Foundation (E2010000879) and the Hebei Science and the Technology Research and Development Program (12213910D).
Social Sciences in China.2010, 2:91-110."
Journal of Hebei University of Science and Technology, 2009,30 (4):323-327."