Search results

The extrusion tools was made up of the hardness materials, in the processing, the tools vibrating on the workpiece surface and rolling the workpiece materials, it made the metal materials to generate perpetual deformation and enhance the hardness of the workpiece surface[1].
The resemblance of the ultrasonic rolling processing and extrusion processing was the plasticity deformation of the metal; the contact stress must greater than yield strength of the workpiece materials [3].
The workpiece materials were 27SiMn,φ97×980mm，27~31HRC.
Journal of Zhejiang University, Vol. 6 (2008), p. 1042-1045 [8] F.
Yuan: Chinese Journal of Mechanical Engineering, Vol. 2 (2002), p. 98-102

ADC12 (AlSi9Cu3) was used for the cast material and SKD 61 was for the die material.
[2] Hongkyu Kwon: Materials Science Forum, Vol.761 (2013), p.79
[4] Jin-Young Park: Korean Journal of Materials Research, Vol.16 (2006), p.668
[8] In-Sung Cho: Journal of The Korea Foundry Society, Vol.12 (1992), p.378
Fu: International Journal of Production Research, Vol.47 (2009), p.5203.

Segal: Materials Science and Engineering A.
Langdon: Progress in Materials Science.
Lefebvre: International Journal of Mechanical Sciences.
Langdon: Materials Science and Engineering A.
Kim: Materials Science and Engineering A.

With the possibility to read the surface temperature of specimen during tests by infrared image processing, many authors worked to use the thermoplastic effect to define mechanical characteristics of materials.
Louche, in: An infrared image processing to analyse the calorific effects accompanying strain localisation, International Journal of Engineering Science 38 (2000), pp. 1759-1788
Uranov and Naimark, in: Theoretical analysis, infrared and structural investigations of energy dissipation in metals under cyclic loading, Material Science and Engineering Vol. 462, Issues 1-2, 25 (2007), pp. 367-369
[11]ASTM E 466-72, Standard practice for conducting constant amplitude axial test of metallic materials
Risitano, in: Thermographic methodology for rapid determination of the fatigue limit of materials and mechanical components, Int.

Materials and Methods Simulator tested component.
J. of Biomedical Materials Research Part B: Applied Biomaterials, Volume 67A Issue 1 (2003), p. 312-327 [7] J.J.
J. of the Mechanical Behavior of Biomedical Materials Vol. 2 Issue 2 (2009), p. 186-191 [13] R.
Materials Science and Engineering 93 (1987) 107 [16] D.
Materials Science and Engineering 93 (1987) 119 [17] D.

When these solicitations exceed locally the tensile strength of the material, crack will be generated and subsequently affect the transport properties of concrete.
Acknowledgements This work was supported by Sustainable Building Research Center of Hanyang University which was supported by ERC program of Ministry of Education, Science Technology (#R11-2005-056-04003-0) and Standard Technology Improvement Project supported by Ministry of Knowledge Economy(#2007-000-0000-6365).
References [1]Kejin Wang, Daniel C.Jansen, Surendra P.Shah, permeability study of cracked concrete, cement and concrete research, Vol.27, 1997, pp.381-393 [2]Corina-Maria Aldea, Surendra P.Shah, Alan Karr, effect of cracking on water and chloride permeability of conrete, journal of materials in civil engineering, vol.11,1999,pp.181-186 [3]Olga Garces Rodriguez, R.Doug Hooton, influence of cracks on chloride ingress into concrete, ACI materials journal, vol.100, 2003, pp.120-126 [4]B.Gerard, J.Marchand, influence of cracking on the diffusion properties of cement-based materials Part І: influence of continuous cracks on the steady-state regime, cement and concrete research, vol.30, 2000, pp.37-43 [5] influence of traversing crack on chloride diffusion into concrete, A.Djerbi, S.Bonnet, A.Khelidj, V.Baroghel-bouny, cement and concrete research, doi:10.1016/j.cemconres,2007.10.007 [6] Xiaoyong Wang, Hanseung Lee, Kibong Park, Numerical simulation of heat evolution of
eco-friendly blended portland cements using a multi-component hydration model, Materials Science Forum Vol. 569(2008)pp.257-260 [7] Xiao-Yong Wang, Han-Seung Lee, Seung-Min Lim.
Numerical Simulation of Autogenous Shrinkage of Eco-friendly Blended Portland Cements Using A Multi-Component Hydration Model Materials Science Forum Vol. 569 (2008) pp. 261-264 [8] Ki-Bong Park, Takafumi Noguchib, Joel Plawsky.Cem Concr Res 2005;35(9):1676- 1684 [9]Byung Hwan Oh, Seung Yup Jang, cement and concrete research, 2000, Vol.34, 2004, 463-480 [10]Sang-Hun Han, construction and building materials, 2007, Vol.21, 370-378 [11]G.De Schutter, magazine of concrete research, 1999, pp.427-435

Introduction Nano-materials have special properties,such as small size effect,surface effect,quantum size effect and macroscopic quantum tunneling effect [1]and so on, and show a series of unique physical and chemical properties,as a result a great deal of attention is paid on the nano-materials[2].
Nano-silver materials have excellent electric and optical properties, and have already been used in the fields of catalysis, antimicrobial, printing ink, bio-label[3,4].
The article uses three different ways to concentrate the lower density of silver solution prepared in the lab,and then make comparison and characterization among the three methods through particle size distribution ,UV-vis and SEM. 1 Experiment 1.1 Experimental materials and instruments Main materials: silver nitrate(AgNO3),AR; hydrazine hydrate,AR; PVP(K-30),AR; deionized water Main instruments: Zetasizer nano,Marvern Instruments Ltd; UV-vis spectrophotometer,Japan Shimadzu; SEM,American FEI co. 1.2 Experimental process The prepation of nano-silver: Take quantitative amount of deionized water with some PVP added ,then adjust the PH,and mix using blender; stir the hydrazine hydrate solution,AgNO3 solution,adding them to the reaction solution,observe the color change of the solution,continue stirring 30 mins and then remove the solution.
Acknowledgement The study is financially supported by Key Project Funding of Beijing Municipal Education & Beijing natural science foundation Committee (KZ200910015001) and Funding Project for Academic Human Resources Development in Institutions of Higher learning under the jurisdiction of Beijing Municipality PHR(IHLB) (PXM2009-014223-077341);(PHR200909124);Opening investigation subject of Beijing area key lab of pringting & packaging material and technology (OISBKPP)(KF201010).
References [1] Wenwen Gao et al: Research and Development in Preparation of Shape-controlled Silver Nanoparticles by Chemical Methods, Precious Metal, 2009.2 [2] Bingdu Xu,et al: Nano-materials and application technology, Chemical Industry Press, 2004,pp.14-16 [3] Taiwei Zhang et al: Shape-Controlled Synthesis and Applications of Silver Nano-Particles, RARE METAL MATERIALS AND ENGINEERING, 2007.8 [4] Xuelin Tian et al: Growth and Stabilization of Silver Nanoplates in Aqueous Solvent Monitored Trough UV-Vis Spectra, Chinese Journal of Chemical Physics,2006.8.27 [5] Xiaoyan He and Mei Yu: Chemical Preparation and Characteristic of Silver Nanoparticles, Lanzhou Jiaotong University, 2005.3 [6] Zongtao Zhang et al: Preparation of Nanometer--sized Silver Powder by Polymer Proteetion Method, Journal of East Chlna University of Science and Technology, 1995.8 [7] Rongchao Jin et al: Photoinduced conversion of silver nanospheres to nanoprisms, Science 294,1901(2001)

Materials and equipments Materials.
Journal of Central South University of Forestry & Technology, 2010, 30(7): 1-8
Hunan Forestry Science & Technology, 2008, 35(6):34-37
Journal of China Agricultural University, 2012, 17(6):165-170
Journal of Jilin Institute of Chemical Technology, 2011, 28(11):39-41

Preparation of Polymer Capsules for Solid Hydrogen Storage Guofeng Gaoa, Lianyong Yub, Bin Yaoc and Yingbo Chend,* School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China.
Introduction Hydrogen, as a clean secondary energy, has the highest combustion intensity among all combustible materials [1].
Experimental Materials.
Yao, Progress in sodium borohydride as a hydrogen storage material: Development of hydrolysis catalysts and reaction systems, International Journal of Hydrogen Energy, 36 (2011) 5983- 5997
Zenhausern, Room temperaturemicro-hydrogen-generator, Journal of Power Sources, 149 (2005) 15-21

properties uses 28 days’ standard material properties stipulated by specification when calculating, but when measuring, the age of concrete is 4 days. 2) Theoretical analysis contains modeling errors, in which, concrete is assumed to be homogeneous and elastic material.
In fact , concrete is composed of sand, stone, cement and other materials which are all non-homogeneous combination materials.
References [1] Weifeng Wang, Quansheng Yan, Yiping Tan and Jing Li: Journal of Zhengzhou University (Engineering Science) .Vol.27(3) (2006), p. 43(In Chinese) [2] Jiqian Luo, Lijing xiao, Weifeng Wang, Quansheng Yan and Yiping Tan: Journal of China & Foreign Highway .Vol.23(6) (2003), p. 48(In Chinese) [3] Dajian Han, Linong Liang and Yufeng Xu: Bridge Construction .Vol.155(3) (2004), p. 34(In Chinese) [4] Chunyang Lu, Chong Wu: Dep.of Bridge Engineering, Tongji University, Shanghai 200092(2007),accepted.
(In Chinese) [5] Qifeng Chen, Aiquan Li, Daliang Zhao and Hao Wang: Journal of southeast (Natural Science Edition).
Vol.21(6)(2004),p.84(In Chinese) [7] Hai Yan, Lichu Fan: China Journal of Highway and Transport.Vol.17(2)(2004),p.46 (In Chinese)