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At present, there are many in-depth researches done on the material properties of the RAC by many scholars.
Acknowledgements This work was financially supported by the Natural Science Foundation of China (51178388510824); the Scientific Research Project of key laboratory in Shaanxi province department of education (11JS059, 12JS055); the Project of visiting scholar of key laboratory in Shaanxi province (12 JS055) ; the Innovation Fund Project of science and technology in China coal geological bureau of aerial remote sensing.
Journal of southeast university，Vol.40, Issue.6(2010), p. 1247-1251
Conference on the Use of Recycled Materials in Building and Structures, November 2004 Barcelona, Spain

Biodiesel production through direct transesterification of microalgae with alcohol via ultrasonic wave Yongfeng KANGa, Huajin SHIb, Linge Yangc,Junxia KANGd,Ziqi ZHAOe College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China a yfkang@shou.edu.cn, b 1070468843@qq.com, cleyang@shou.edu.cn, dkangkang245683396@126.com, e275417273@qq.com Keywords: biodiesel; microalgae; ultrasonic-assisted; transesterification Abstract: A one-step extraction/transesterification process was developed to directly convert microalgae into biodiesel in the presence of catalyst, KOH using ultrasonic irradiation.
In recent years, the raw material for biodiesel preparation is mainly focused on oil crops such as soybean, sunflower, palm and rapeseed.
Materials and methods 2.1 Reagents.
The modelXH-2008D ultrasound reactor from Beijing Xiang Hu Science and Technology Development Co., Ltd (China).A model RE-52 Rotary evaporator from Qing Pu Hu Xi Instrument factory Shanghai China.
Journal of the Taiwan Institute of Chemical Engineers, 42(2011)640–644

Materials and instruments 78% (w/w) methamidophos emulsifiable concentrates was purchased from Jiahua Company in Zhejiang; AgBr/TiO2 was made by labs;Fenton Reagent was propared by labs; Probing type ultrasonic generator was purchased from Tianhong testing equipment company in Siping ;500W high-voltage mercury lamp were supplied by Shanghai Ouwei Lighting Equipment company.; high performance liquid chromatography (Dionex UltiMate 3000 HPLC)was purchased from USA. 2 .Degradation experiment and analysis method (1) degradation experiment：At first, A certain concentration of Methamidophos solution 400ml and certain quality of AgBr/TiO2 powder were added to the 500ml beaker, then the AgBr/TiO2 power was uniformly dispersed in solution by entering air and stiring for 30 minutes.
hydroxy is the main reason of photocatalytic degradation, however, ultrasonic wave can induce the formation of these perssad in water[7]. 2) Photochemical catalyst's particle fragmentation can increase surfacel area of fixed particles, and provide more efficient activity to increase hydroxy and the other oxidation perssad. 3) Ultrasonic wave's surface cleaning function can get rid of absorbing material on the surface of catalyst to prevent it inactivation. 2. the influence of initial concentration on the degradation rate Preparing respectively methamidophos waste solution with concentration of 100 mg/L, 300 mg/L and 600mg/L, adding 0.6g anatase AgBr/TiO2 powder, entering air and stirring for 30 minutes ,then the wastewater was degradated by sonophotocatalytic oxidation technology .
Environmental Science Journal.
Environ-mental Science & Technology, vol40, (2006).p.3775–3781.

Research of residential area ecological green roof for reduce the heat efficiency in Taichung Chen Chiou-Chuan1a, Lee Soen-Han2b 1Assistant Professor, Chung Chou University of Science and Technology, Department of Landscape Architecture,No.6,Lane2,Sec.3,Shanjiao Rd.
Materials and Methods (1)Empirical location: Taichung Shenkang (Taiwan), a residential area second floor roof of a building on the top floor. (2)Empirical facilities: September 2011 facility complete, monitoring from January 2012 to May 2012.
Plate-green pad (20x30x8cm) Schematic diagram cultivation medium (3) Planting material: a perennial evergreen plants, Alternanthera payonychioides St., Rhoeo spathacea (Sw.), Angelonia salicariifolia Humb. & Bonpl.
&Lee,S.H., Research of green roof and facade vegetation reduce the heat efficiency (I) Journal of Health and Care Science Vol.1 N0.2 p88-103., (2012),Taiwan(R.O.C

For the method of plating bath prepared by reaction between low carbon steel chips or iron plate with hydrochloric acids, materials are gotten easily, the expense is lower, but time for dissolving iron chips is longer, and in the plating bath, there are some impurities which are not easy to clean.
Table 4 The data of sliding friction experiment time/H material particle content/g/l wear pattern average /g Relative/% 2 45#steel quenching 0 0.0008 100 Fe- Al2O3 10 0.0004 200 Fe- Al2O3 20 0.0002 400 Fe- Al2O3 50 0 excellent 6 Fe- Al2O3 50 0 excellent Fe- Al2O3 60 0 excellent The experiment results show that the friction performance of plating coatings in good lubrication is excellent when the content of nano- Al2O3 is 50-60 g/l. 4.3The experiment of hardness.
RARE METAL MATERIALS AND ENGINEERING. 2010 39(2)
CHINESE JOURNAL OF LASERS. 2003 66(3) [6] Zhuo Cheng-Zhi, Lu Xiao-Lin, Han De-Zhong, etc.
JOURNAL OF NANJING UNIVERSITY(NATURAL SCIENCES) . 2009 45(2) [7] Xu Longtang, Xu Binshi, Zhou Merling.

Welding Materials, Equipment, and Test Methods Overview.
The chemical composition and mechanical properties of welding materials are shown in Table 2.
Chemical composition (mass fraction,%) and mechanical properties of welding materials.
Science of advanced materials, 2021(12): 13
Materials Science and Engineering A, 2017(703), 477-485

Introduction In the engineering construction,sand is the common material in construction which has been used in great amount, not only directly applied in buildings such as roadbeds, bridges and culverts, tunnels and buildings but used in masonry of structure[1].
In Table 4,is ultimate moment, based on material’s observed strength and calculated by the normal formula in code;is flexural ultimate moment of the test.
Journal of Building Structures (Supplementary Issue).s1(2008)161-166
,The research present condition of manufactured sand and manufactured sand concrete, J.Science and technology of overseas building materials. 25(2004)20-24
[4] Tien S Chang, Clyde E Kesler, Fatigue Behavior of Reinforced Concrete Beams, J.ACI Journal Proceedings. 55(1958) 245-254

Introduction In the normal course of product development, it often becomes necessary to change the design of products and systems consistent with shifts in demand and with changes in the availability of the materials and components from which they are manufactured.
Logistical – Loss of the ability to procure the parts, materials, manufacturing or software necessary to manufacture and/or support a product. 2.
[7] A., Levinthal, D., Purohit, Durable Goods and Product Obsolescence, Source: Marketing Science, Vol. 8, No. 1 (Winter, 1989); pp. 35-56, Published by: INFORMS
[8] N., Rosenberg, On Technological Expectations, Economic Journal, 86 (Sept., 1976); pp.523-535
[10] B.Y., Orbach, The Durapolist Puzzle: Monopoly Power in Durable-Goods Markets, Yale Journal on Regulation, no. 21, 2004; pp. 67-118

While involving the aspect of type in construct high or super high building, bundled tube structure obtained the good application in high and super high building due to the bundled tube structure's superiority in load transferring, earthquake-resistance, flexural rigidity and it could exert material characteristic properly, and it also could provide much larger available space, making the layout more flexible, as well as much higher[3,4].
umerical example and analysis of calculating results Example: the cross section of bundled tube structure for material of reinforced concrete is shown as Fig.3. the average thickness of equivalent thin-wall tube is 0.45m, the height is 12m and the altitude of the tube is 180m.
The elastic constants of structural materials to resist pull, push or shearing force are respectively 1 1 2 2 , , , E fE G fG E rE G rG = = = = , the elastic modulus of steel reinforced concrete is 7 2 3.25 10 / , 0.45 E k% m G E = × = .
Natural Science Journal of Hainan University, 1996, 14(2): 189～193.
Journal of Building Structures, v24(1), 54～58, 2003.

If the maximum stress in a gear tooth is less than the fatigue limit for the material, the tooth should not fail even after prolonged running.
The von mises stress is also known as the maximum distortion energy criterion, octahedral shear stress theory, which is used to estimate the yield of a ductile material.
Evaluation of Gear Tooth Stresses by Finite element method, ASME journal of Engineering for Industry, vol.117, p.232-239(1955) [12] Vijayarangan.S and Ganesan.N. : Static Contact stress analysis of composite spur gear tooth using the Finite Element Method, including frictional Effects, Computers and structures,vol 51,p.765-770(1994)
[14] J.D Andrews:A Finite Element Analysis of Bending Stresses induced in External and Internal Involute spur gears,”IMechE, Journal of strain analysis, vol26,no.3 [15] Buckingham.E:,”AnalyticalMechanicsofGears,Mcgrawhill, London(1949)
[24] Ali Raad Hassan, 2009: Contact Stress Analysis of Spur Gear Teeth Pair, World Academy of Science, Engineering and Technology 58 [25] Dr.