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Materials and methods Study site This study area was located in Tumenling Railway Forest Farm (44°06′N, 126°02′E), Jiutai District, Changchun City, Jilin Province, China.
Journal of Beijing Forestry University, 22(3): 33~36 (in Chinese with English abstract) [4] Bai Shangbin, Zhang Yandong, Wang Zhengquan. 2001.
Beijing: Science Press (in Chinese) [10] Yu Tianren. 1987.
Beijing: Science Press (in Chinese) [11] Wright R J. 1989.
Plant Nutrition and Fertilizer Science, 5(1): 50~55 (in Chinese with English abstract)

Although it comes from the summary and ascension of natural sciences research, the formed thinking modes and methodology also produces a great impact on politics, economy, culture and other fields of social sciences.
It is called “dissipative structure”, because this system needs to dissipate certain energy and material to maintain its own stability and order.
Therefore, in order to keep orderly, the system will have to be open and exchange material, energy and information with the outside world.
[2] Macintosh R, Maclean D: Strategic Management Journal, 1999(20): 297- 316
[6] Hengxin HE, Yongcheng Wang: Science Economy Society, 1995(1)：53-55, in Chinese

Study on method of knowledge acquisition and its application in the design of vehicle clutch XU Yuan-hao College of Engineering and Technology,SouthWest University, Chongqing 400716,China xuyuanhao@guigu.org Keywords: Knowledge management;Knowledge acquisition;Ontology;Clutch Abstract.Facing a great deal of materials and data in the process of design and manufacturing of clutch product, Quick and accurate knowledge extraction from the literature resources and web pages is a key to the design of vehicle clutch.
Journal of Sichuan University (Engineering Science) ,2006 ,38(5):38-47

This materials presents excellent adsorption capacity on Pb2+. the absorption type on Pb2+ of this modified fibers was monomolecular.
Acknowledgment We thank the financial support of the National Natural Science Funds of China (Grant No.21302001).
Journal of Fisheries of China，2011，35(3):410~416(In Chinese)

Achary, Journal of materials Engineering and Performance 9, 56-61 (2000). 2.
Shy, Materials Science and Engineering A347, 123-129 (2003). 7.
Feng, Metallurgical and Materials Transaction A 29A, 2511-2521 (1998). 8.
Shy, Metallurgical and Materials Transaction A 32A, 295-303 (2001). 9.
Wang et al., Diamond and Related Materials 9, 831-837 (2000). 11.

Consequently, "the world of science" and "the world of industry" cooperate in achieving the goal of initiating and manufacturing new technological processes and creating new ultra/multi-functional engineering materials and unconventional structural materials subjected to cyclic-fatigue operation in highly invasive and wearable working environments [1-4].
Materials and Design Two structural steels were selected as the substrate/core for deposition of low-friction and anti-wear CrN+WC/C composite coating in order to carry out the author's own research under real cavitation wear conditions.
Borek: Numerical analysis of the cavitation effect occurring on the surface of steel constructional elements, Archives of Materials Science and Engineering. 85(1) (2017) 24-34
Pancielejko: Mechanical and Functional Properties of Cavitation Generators with PVD Functional Coatings Intended for Use in the Cavitation Environment, July 2019, KEY Engineering Materials 813, 234-240
Tański, W Borek, Influence of Applied CrN+ WC/C and WC/C Coatings on the Cavitation Wear Processes of Constructional Elements, Key Engineering Materials 813, 62-67.

Key Engineering Materials Vol. 925 1827[5] F.
In: Journal of Materials Science 42-16 (2017), pp. 6854-6861
"Electrostatic and magnetostatic properties of random materials".
In: Mechanics of Materials 137 (2019), p. 103098
Key Engineering Materials Vol. 925 1829

One of the methods to reduce the amount of synthetic plastics is to add natural material into plastic.
Natural fibers are one of natural materials which have been increasingly used as alternative fillers in polymer composites.
Experimental Materials A commercial grade of isotactic PP (700J) was supplied by Thai Polypropylene Co., Ltd.
Thomthong, Composites Part A: Applied Science and Manufacturing, 38, 590-601, 2007
Edyham, European Polymer Journal, 38, 39-47, 2002

The material gravity may be obtained according to the bucket capacity of hydraulic excavator, the bucket capacity is , the density of general soil (III level soil) is , so the material mass of excavator is , its material gravity is .
Parameters of excavating resistance and material gravity can be set as follows: STEP function of tangential excavating resistance : step(time,0.2,0,1,-22)+step(time,1,0,1.2,22) STEP function of normal excavating resistance : step(time,0.2,0,1,-9.24)+step(time,1,0,1.2,9.24) STEP function of material gravity : step(time,0.2,0,1.2,-11.466)+step(time,1.2,0,3,0)+step(time,3,0,3.5,11.466) During simulation hydraulic excavator finishes dropping arm, the bucket enters excavating place, the boom hydraulic cylinder, the bucket arm hydraulic cylinder and the bucket hydraulic cylinder move together, therefore, and the change of force curve of the hinged joint at this time is siderable.
Trampczyński: Journal of Terramechanics, Vol. 40(4) (2003), p.221-233
[5] Lei Yulong, Li Xingzhong, Liang Weipeng, Hanyong: Procedia Environmental Sciences.

Fig.1 Geometry model of continuous extrusion Material model.
The H13 tool steel was used as the material for all extrusion tooling (coining roller, extrusion wheel, die, chamber).
The tooling material of these regions should have high strength.
Acknowledgements This work was financially supported by the National Natural Science Foundation (50635020).
[3] T.Katajarinne, T.Manninen, P.Ramsay: Journal of Material Processing Technology, Vol. 177 (2006), p600-603