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Betulin can be used to produce polymer materials [3], as a building block for biologically active compounds.
Materials and Methods Obtaining BOB Extract.
Sofić, Identification and Isolation of Pharmacologically Active Triterpenes in Betuale Cortex, Betula Pendula Roth., Betulaceae, Bosnian Journal of Basic Medical Sciences. 9 (1) (2009)
Falev, Determination of Triterpenoids From Birch Bark by Liquid Chromatography-Tandem Mass Spectrometry, Journal of Analytical Chemistry. 69 (13) (2014) 1264-1269
Moilanen, Betulin Derivatives Effectively Suppress Inflammation in Vitro and in Vivo, Journal of Natural Products. 79 (2) (2016) 274-280

Material resources sharing could fully use depletable resource and maximize effectiveness.
Strategic Management Journal, 2000,21(3):387-404
[4] Luo Y D.Contract, cooperation and performance in international joint ventures[J].Strategic Management Journal,2002,23(10): 903-919
Symbiosis Theory[M].Beijing: Economic Science Press,1998
Journal of Economic Behavior and Organization, 1992,18(1): 1-25.

Study on Thermal Deformation Behavior of Cu-P Weathering Steel Xin Zhang 1, a, Yi Xiong 2, b 1College of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, Henan, china 2Henan key laboratory of advanced non-ferrous metals, Luoyang 471003, Henan, china azhangxin_sdtj@126.com, bxy_hbdy@163.com Keywords:Weathering steel, Deformation temperature, Strain rate, Thermal deformation equation, Recrystallization Abstract.Using thermal simulator (Gleeble 1500D), the thermal deformation behavior of Cu-P weathering steel containing Cr, Ni, Mo under the conditions of various deformation temperatures and strain rates was studied.
The thermal deformation testing of the materials was achieved using the Gleeble 1500D-type thermal simulator.
This is because enhancing deformation temperature can make the materials generate new slip system and cause the stress decrease.
Materials Review (in Chinese),2000,14(7):12-13 [2] Ding Yuan Fa, Fan G S.
Microstructure of 18-8 austenite stainless steel after dynamic strain aging.Transactions of Materials and Heat Treatment (in Chinese), 2005,36(5):41-46

Introduction Ceramic materials such as bricks are made essentially of clay along with other materials.
However, it is also known, [4], that Washburn's law can be generalized for water absorption in porous materials to Eq. 9
Dreyer: Journal of Colloid and Interface Science Vol. 327 (2008), p.125
Mazzanti: Construction and Building Materials Vol. 23 (2009), p. 2623
Asterios: Building Materials Capillary Rise Coefficient: Concepts, Determination and Parameters Involved.

The figure shows the influence of alloying elements on the fatigue life of the materials.
In this report they have analyzed a large number of materials used in the aircraft industry usually for the shell elements.
As for the tested materials the aluminium 24S T-3 and 75S-T6 have been used.
,Seeger T.: Materials data for cyclic loading, Materials science monographs 61, Elsevier Amsterdam, 1990
N., Watson P., Topper T.H., A stress strain function for the fatigue of metals, J. of Materials, ASTM Vol. 5, No. 4 (1970), pp. 767-778

Mixed-mode Ion-exchange Polymeric Sorbents: Dual-phase Materials that Improve Selectivity and Capacity [J].
Fractionation Analysis of Oxyanion-forming Metals and Metalloids in Leachates of Cement-based Materials Using Ion Exchange Solid Phase Extraction[J].
Food Science, 2005, 26(1):176-179 [20] Ren Jin, Jiang Ke, Xu Xiaobai, Determination of Trace Atrazine and Its Environmental Degradation Products by Solid Phase Extraction and Liquid Chromatography/Mass Spectrometry [J].
Journal of Instrumental Analysis, 2007, 26(5):682-685 [22] Liu Xinyan, Pan Canping, Liu Su, Determination of Cyromazine Residue in Vegetables by Strong Cation Exchange-Solid Phase Extraction and High Performance Liquid Chromatography [J].
Chinese Journal of Pesticide Science, 2008, l0 (2): 166-17 [23] George Stubbings, Jonathan Tarbin, Andrew Cooper, et al.

Journal of Alloys and Compounds. 487 (2009) 445 - 449
Zha, Mechanical properties and microstructure of aluminum alloy 2618 with Al3(Sc, Zr) phases, Materials Science and Engineering. 368 (2004) 88 - 93
Sinning, Internal Friction in Metallic Materials, A Handbook, Springer, Berlin, Heidelberg, 2007
Jian, Role of stacking fault energy in strengthening due to cryo-deformation of FCC metals, Materials Science and Engineering. 527 (2010) 7624–7630
Man, Effect of heating rate on the microstructure and texture of continuous cast AA 3105 aluminum alloy, Materials Science and Engineering. 478 (2008) 173–180

In the key Journal of Communications of ACM, she gives her definition of thinking[1] .
The theory of Science (Theoretical thinking).
The experimental sciences (experimental thinking).
Computing Science (Computational Thinking).
At present, 450 teaching materials of VB program design course have been uploaded.

Available at: Science direct [cit. 2015-1-25]
Available at: Science direct [cit. 2015-1-25]
Available at: Science direct [cit. 2015-2-1]
Available at: Science direct [cit. 2015-2-10]
Available at: Science direct [cit. 2015-2-15]

Product value chain is a collection of chains with customer demand oriented, relying on certain core technologies or products, with many types of agriculture-related enterprises, farmers' cooperative organizations and farmers and so on as the leading entities, which organically links up agricultural materials production, agricultural products production, processing, warehousing, logistics, marketing and so on to achieve the value-added of agricultural products (Wang Kai, etc., 2003).
The construction of agricultural science theory and model to explore [M].
Journal of Henan Agricultural Sciences , 2011, 40(8): 5-9 [7] YuHongBin, HanShouxin, AnFang.
Journal of Binzhou University ,2010,26(6):26-31 [10] ZhangHong, HeXiDe, ZhengLinYong, GongWanzhuo, RenGuangJun.
Guangdong Agricultural Sciences ,2010,(9):271-273 [15] XueXiaoYan.