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When it comes to the materials, there were 2 main development directions.
Fuel cell is very complicated, which is related to theories of chemical thermodynamics, electrochemistry, electrocatalysis, material science, power system and automatic control.
The area of material: find more economic raw materials to produce chemistry batteries; find electrode materials with better stability and absorbability. 2.
Power Journal Vol 6 ( 2012) ,p.1-7 In Chinese [2] S.P.Jiang.
Science and Technology Progress countermeasure Vol5 (2013),p.74-77 In Chinese [4] Z.H.Wang,Y.H.Wang.

Effect of Shape Parameters on the Modal Properties of Stepped Ultrasonic Concentrator Milan Nad1,a, Lenka Cicmancova1,b 1Slovak University of Technology in Bratislava, Faculty of Materials Science and Technology, Department of Applied Mechanics, Paulinska 16, 917 24 Trnava, Slovak Republic amilan.nad@stuba.sk, blenka.cicmancova@stuba.sk Keywords: vibration, ultrasonic assisted machining, waveguide, modal properties.
Positive results [1,2] in machining processes of hardly machinable materials (hard, soft, brittle, ductile materials) are obtained by using ultrasonic assisted machining.
Acknowledgments This work was supported by the project of VEGA-1/0389/11 provided by the VEGA Commission of Ministry of Education, Science, Research and Sport of Slovak Republic.
Ultrasonically assisted turning of aviation materials.
Journal of Materials Process.

Fig.1 The reconstruction of physical product’s model 1.2 The experiment of materials and equipments Molding materials (ABS B601) and support materials (ABS S301) are two kinds of materials applied to rapid prototyping.
Preheat the rapid prototyping machine, wait for the temperature of forming chamber, molding materials and the support material reached to the machine acquiescent temperature (Molding chamber was 90℃, the molding material was 260℃, the support material was 240℃)
(9) Update material.
Select "File--3D printer--update material/nozzle", the material was updated to 1 kg
Journal of Manufacturing Systems, 2011, 30(4): 214-222

In addition to the main silicon carbide raw material, other materials have been used in the mixture.
Pernicova: Possibility of using recycled raw materials (Corundum and silicon carbide) in cementitious mixtures, Proceedings of 7th International Conference on Mechanics and Materials in Design (M2D), Portugal, p. 679-680, (2017) [4] J.J.
Construction and building materials, Vol (45), Issue 6, p. 324-331, (2013) [6] H.Y.
Materials letters, Vol (62), Issue 19, p. 3441-3443, (2008) [7] J.
KCCE Journal of civil Engineering, Vol (21), Issue 6, p. 2252-2258, (2017) [9] R.Pernicova, T.

Applying an improving measurement of cutting force to study machinability of gray cast iron Rui Wu 1, a, Danwen Zhang 1,b , Juan Sun 1,c , Fengzhang Ren 2,d, Yufei Wang 2,e and Lili Xiao 2,f 1 Department of Mechanical and Electrical Engineering, Luoyang Institute of Science and Technology, Luoyang, Henan, China, 471023 2 School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang Henan, China, 471003 awurui_ly@126.com, blylgzdw@sina.com, csj1962@126.com, drenfz@mail.haust.edu.cn, ewangyf@mail.haust.edu.cn, fxiaolili375@163.com Keywords: machinability, cutting force measuring, dynamometer calibration, gray cast iron Abstract.
Acknowledgements This study was supported by the Henan Province Program for Science and Technology Innovation Talents (104100510005 and 2009HASTIT023), by the Henan Province Key Problem Project (092102210012) and by the Luoyang Applied Technology Study and Development Foundation (0901011A).
Study on the cutting character and the materials for cylinder block (master thesis).
Journal of rare earths.

Study on Initial States of Steel Balls in Mill by Discrete Element Method Ping Zhou1,a , Jinghong Du2,b, Xixiang Duan1 1Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming, 650093, P R China 2Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, P R China a xkzp@sina.com; b2506990447@qq.com Keywords: DEM; steel balls; initial states; PFC3D Abstract.
[3]H.Y.Yang.H.Yang.The first national technology symposium of grinding medium and wear-resistant materials ,1996, p69
International Journal of Rock Mechanics & Mining Sciences, 46(2009) pp983-999 [7]K.

Materials and methods 1.
The fact that water and solar radiational energy are two primary materials of photosynthesis is likely an important mechanism behind the climatic influences on biomass [16].
Wu: Vegetation of China (Science Press, Beijing, 1980) (in Chinese) [2] J.Y.
Ci: Science Vol. 292 (2001), p. 2320-2322 [5] J.M.
Hashen: HeBei Journal of Forestry and Orchard Research Vol. 20 (2005), p. 309-313 (in Chinese)

It has become more and more perfect on operation and management, being accumulated sewage reuse for many practical experience and a more perfect science research result but also achieved complete sets of technology achievements.
Shaoxing building materials City owner who knows the customer psychology, in a warm and introduced a variety of faucet, valve at the same time, always does not forget to pick up a sentence: " there is a water saving function. " A stall to the author said: " since the water fee increases, five hundred or six hundred yuan a water-saving toilet one day to sell five or six, water-saving faucet, valve to sell more. " A good set of equipment for saving water resource to produce very big effect.
Acknowledgment This research is partly supported by Science Technology Department of Zhejiang Province (NO. 2012C23063).
Water Science & technology( In Chinese ). vol.09 (2011), p.122-125
Journal of Nanjing Normal University( In Chinese ). vol.10 (2010), p.105-108

In some cases where the application of traditional concrete structures is restricted, such as structures that require the environment without magnetic and electric interferences, the best way is to use nonmetallic materials.
FRP reinforcements is a kind of linear elastic material and exhibit several properties such as high tensile strength, light weight, noncorrosive and nonmagnetic, which make them suitable for use as structural reinforcement in marine engineering, road engineering, bridge engineering, hydraulic engineering, geotechnical engineering and some special engineering[1-3].
Materials Figure 1 shows continuous FRP rectangular spirals used in the tests.
Acknowledgements This work was financially supported by Key Project of Chongqing Science and Technology Research (CSTC, 2011AB0043).
[7] Ahmed K.El-Sayed, Ehab El-Salakawy, B.Benmokrane: Journal of Composites for Constructure.

They have proposed in the report the concept of applying nano modifying technology into asphalt cementing materials [1].
Eidt in the US is the first to apply Nano composite technology in polymer / phyllosilicate nano composite materials into modified asphalt [2].
Perspective on nanotechnology in construction materials with a focus on asphaltic materials.
Florida：NSF Workshop on Nano modifications of Cementitious Materials rR]. 2006 [2] Gao Qibiao, Shentu Baoqing, Weng Zhixue.
Journal of Shandong Jiaotong University, 2004(4): p10.