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The main conclusion is that when the thickness of micro-beam is close to the characteristics size of the materials, the natural frequency will show a significant scale effect phenomenon.
Then considering the characteristic length of the selected materials, it goes on to explore the relationship between the micro-beam thickness and natural frequency and analyze the remarkable scale effect of the natural frequency embodied in the micro-dimension.
In particular, the quantitative analysis model between the natural frequency and the intrinsic characteristic length of micro-beam materials is established.
A microbend test method for measuring the plasticity length scale :Acta Mater Vol.46(1998),p. 5109 Acknowledgement This work is supported by National Nature Science Foundation of China under Grant No. 10972056 and Natural Science Foundation of Fujian Province under Grant No. 2008J0141 Author Biographies Meiqin Chen(1984-),female, a master of machine design and theory.
The main study field is mechanics of MEMS and micromechanics of materials.

Smart concrete is a branch of smart materials; its origin can be traced to the cement-based electric materials obtained by combining carbon with cement by soviet scholars in the 1960s.
A factory relative to the smart materials and structures in civil engineering was built on the sustentation of National Nature Science Foundation of USA in 1993.
However, it is difficult for fabricating intact smart concrete materials with various functions according to the present science level.
[13] Fu XuLi, XiaoHuiLi and Chung D.D.L.: Improving the vibration damping capacity of cement, Journal of materials science, 33(1998), pp. 3601-3605
[35] Dry Carolyn: Passive smart materials for sensing and actuation, Journal of Intelligent Material Systems and Structures, 1993, 4(3), pp. 420-425

Lieurade, Materials Science and Engineering A 210 (1996) 102
Hill, Materials Science and Engineering: A 477 (2008) 208
Chengye, Materials Science and Engineering: A 257 (1998) 322
Edwards, Computational Materials Science 49 (2010) 751
Edwards, Materials Science and Engineering: A 527 (2009) 297.

Isa3,c 3Advanced Material Research Group; Renewable Energy Research Interest Group 1,2 Department of Physical Sciences, Faculty of Science & Technology, University Malaysia Terengganu, 21030 Kuala Terengganu, Terengganu, Malaysia a wfei_1017922@hotmail.com, bpcmn_1211@hotmail.com, cikmar_isa@umt.edu.my Keywords: Carboxy methylcellulose, citric acid, conductivity, proton conductor.
HATTORI: MATERIALS LETTERS.
ISA: JOURNAL OF CURRENT ENGINEERING RESEARCH.
ROTH: JOURNAL OF SOLID STATE CHEMISTRY VOL. 4(1971), P. 294-310
ISA: INTERNATIONAL JOURNAL OF THE PHYSICAL SCIENCES.

Lignin is one of the main chemical components of fibrous materials.
Acknowledgement: The project was funded by Jinan Youth Star Science and Technology Program (2011-2-0312).
Wang, Research Progress of Preparation of Activated Carbons from Plant Biomass Journal of Anhui Agri.
Zhou, Preparation of Lignin Activated Carbon with High Decolorization Power, Natural Science Journal of Xiangtan University, 6(1991), p13 [5] T.
Luo, Study on Preparation of Lignin Activated Carbon with Zinc Chloride，Journal of Anhui Argi.

Effect of the Er on resistivity and spreading properties of Bi5Sb8Sn solder alloy Shuai Li 1,a, YanFu Yan 1, b, LiFang Feng 1,c, HongNa Wang 1,d 1College of Material Science and Engineering, He Nan University of Science and Technology, Luoyang,China 471003 aemail: lyctlishuai@163.com ,bemail: yanyanfu@mail.haust.edu.cn, cemail: fenglifang198306@126.com, demail: xiaona1986107@126.com Keywords: quaternary alloy;rare earth Er; resistivity;spreading area Abstract: In this paper a novel quaternary alloy is formed by adding a small amount of rare earth Er(RE) into Bi5Sb8Sn solder alloy to improve its technological properties.
In this paper, a new Bi5Sb8SnRE quaternary alloy was formed by adding different contents of Er which could alternate high-lead solders and the high-cost Au-based solders to speed up China’s lead-free process. 2 Experiment procedure 2.1 Solder preparation The pure Bi, Sb, Sn and Er with purity of 99.95% were used as raw materials.
References [1] Z T Hu, D R Xu: Electronics Process Technology Vol. 26(2005), P. 125-128 [2] J Glazer: Journal of Eletronic Materials Vol, 23 (1994), P. 693-697 [3] Y C Liu, J W R Teo, S K Tung and K H Lam: Journal of Alloys and Compounds Vol. 448(2008), P.340–343 [4] C H Du,F Chen and Y F Du: Electronic Components and Materials Vol. 123(2004), P. 34~36 [5] J Glazer: Journal of Eletronic Materials Vol,23 (1994), P. 693-697 [6] L F Feng, Y F Yan and X X Guo: Materials Science Froum Vol. 610-613(2009), P. 537-541
[8] B Li, Y W Shi and Y P Lei: Journal of Electronic Materials Vol. 34(2005), P. 217

Materials and Method Synthesis of nitrogen coated on carbon 2g of urea and 1g of PVP were dissolved in 50 mL of ultra-pure water.
For nitrogen-doped carbon, Fe-N/Gt catalyst has the smallest particle size thus increase the electrocatalytic activity of materials.
Zelenay, Synthesis-structure-performance correlation for polyaniline-Me-C non-precious metal cathode catalysts for oxygen reduction in fuel cells, Journal of Materials Chemistry, 21 (2011) 11392-11405
Bao, Synthesis of M (Fe3C, Co, Ni)-porous carbon frameworks as high-efficient ORR catalysts, Energy Storage Materials, 11 (2018) 112-117
Sulaiman, Investigation of Carbon Composition for Electrochemical Properties as PEMFC Cathode Catalyst, Materials Science Forum, 964 (2019) 13-18

Repair materials for patch repair systems for deteriorated reinforced concrete structures include impregnants for concrete quality modification and improvement, corrosion-inhibiting coating materials for reinforcing bars, patch materials, surface preparation materials and coating materials for finish and protection.
Intelligent Repair Materials.
The polymer-modified mortars using the redispersible polymer powders are used in the fields of coating materials for textured finishes, surface preparation materials for finishing, self-leveling materials, tile adhesives and repair materials.
Kodama, Study on peeling behavior of bond interface of concrete members retrofitted by surface overlaying with polymer cement mortar (in Japanese), Journal of Materials, Concrete Structures and Pavements, JSCE. (732/V-59) (2003) 77-87
Fujita, Study on the durability improvement of concrete surface covering materials (in Japanese), Concrete Journal. 47(2009) 30-36

However, components made with these materials usually work under harsh conditions such as high-temperature, high-speed and high-pressure, so the surface quality requires high performance.
AE is commonly defined as transient elastic waves within a material caused by the release of localized stress energy.
Acknowledgements This study is supported by National Science Foundation of China (50805100) and Natural Science Foundation of Tianjin (08JCYBJC01300).
Journal of Tsinghua University (Science and Technology) Vol.48 (2008), p. 812-815
Journal of Detection & Control Vol.32 (2010), p.43-47

Curtis (1996): Composites Science and Technology, vol.56, p.677 – 84
Yang (2002): Journal of Composite Materials, vol.36, p.851 – 71
Haritos (2013): Key Engineering Materials, vol.525-26, p.521 – 4
Chrysanthou (2014), Key Engineering Materials, vols.577-578, p.545 – 8
Shen (2008): Mechanics of Materials, vol.40, p.183 – 94