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Titanium thin film is widely developed and used in micro-electromechanical systems (MEMS), medical implantation, and the potential applications of smart materials[8].
This paper pioneers to utilize titanium thin film material to be the main material of the pressure compensator.
Y, DSV-specific tool-box for the deep-sea resources exploitation, Chinese Journal of Mechanical Engineering, 2003,39(11), pp. 38~42.
W, Direct pH measurement of NaCl-bearing fluid with an in situs sensor at 400℃ and 400 megapascals．Science, 1996, 272(6):l634～1636
Ying Study of the sealing characteristic of polytetrafluoroethylene-coated O-ring applied in gas-tight deep-sea water sampler Source: Advanced Materials Research, v 295-297, p 3-10, 2011, Manufacturing Science and Technology

Three, combined practice with projects of science research.
The students were divided into four groups: Quality and Safety, Material Experiment, Project Measurement, and Steel Bar Handling and Installment & Concrete Casting.
References [1] Qi Wen-chun and WANG Yun, “Research on and practice of the mode of graduate exercitation and project of engineering students”, Journal of Nanchang Institute of Aeronautical Technology (Social Science), Vol.5 No.1(2004),p. 8-11
[2] Zheng Fa-ping,Qian Po and Li Peng, “Practice and Discussion of Graduation Field Work of Water Conservancy and Hydroelectric Engineering Major”, Journal of Xichang College(Natural Science Edition), Vol.21 No.2(2007),p.139-141
[4] Lei Deng-Feng, “A Combination on Production, Graduation Practice and Fieldwork”, Journal of Xi'an Aerotechnical College, Vol.22 No.5(2005),p.63-64

Acknowledgements This work is financially supported by the National Natural Science Foundation of China (50774032), the Key Program of National Natural Science Foundation of China (50934006) and Hunan Natural Science Foundation (11JJ6057).
Sundin: Journal of Sound and Vibration Vol. 137(1990), p. 483-493
Lundberg: International Journal of Rock Mechanics Mining Science & Geomech Vol. 27(1990), p. 553-558
Wu: Engineering Journal of Wuhan University Vol. 36(2003), p. 22-25.
Collet: International Journal of Impact Engineering Vol. 37(2010), p. 901-906

In Britain more than 30% of the gas station and almost all of the chemical plant, refinery, chemical material depots were serious polluted.
will more effectively.Through the continuous extraction of groundwater pollution, pollution plume range and pollution level decrease gradually, and pollutants in aquifer medium transformed to water and then to be cleared[32].Sometimes we can pass into the surface active agent to enhance pump-treat effect.There are a lot of methods to treat the pollution of groundwater, such as adsorption, filtration, membrane separation and gravity separation, ion exchange, biological contact oxidation and biological filter, REDOX, coagulation precipitation, etc. 2.Permeable reaction barrier technology Permeable reactive barrier (PRB) also called permeable reaction wall technology, is the groundwater in-situ treatment method which treating groundwater in the 1990s in Europe, the United States and other countries[9].It is a kind of technology, which can replace the traditional pump-treat system and land biological treatment.A permeable reactive barrier (PRB) is an engineered, subsurface zone of reactive material
It includes the downstream of the sources excavates groove, and then pack reaction medium, and the pollution of groundwater reacts with reaction medium, last make the pollutant dealt with.Reaction filling medium can include zero-valent iron, activated carbon, peat, montmorillonite, lime, sawdust or other materials[34-35].
[12] Xiuming Wang :Safety and Environmental Engineering.Vol.15 (2008),p.40(in Chinese) [13] Jing Guo,Lin Zhao and Nianlei Liu:Environmental Pollution &Control.Vol.33 (2011),p.52(in Chinese) [14] R.C.Gogu,A.Dassargues:Environmental Geology.Vol.39 (2000), p.549 [15] D.Daly,A.Dassargues and D.Drew:Hydrogeology Journal.Vol.10 (2002), p.340 [16] P.M.Santos,M.R.Llamas and P.E Alfaro:Environmental Modelling &Software.Vol.23 (2008), p.1145 [17] M.G.Rupert:Ground Water.Vol.39 (2001), p.625 [18] L.T.Aller,J.H.Bennett:DRASTIC: A Standardized System for Evaluating Ground Water Pollution Using Hydrogeologic Settings EPA(Environmental Research Laboratory,US EPA 1985) [19] Qing Yang,Jiti Zhou:Journal of Dalian University of Technology(Social Sciences).Vol.39 (1999), p.684(in Chinese) [20] Surong Fu,Yangxin Wang and Hesheng Cai.Earth Science-Journal of China University of Geosciences.Vol.25 (2000), p.477(in Chinese) [21] Jing Lei, Sicong Zhang:Acta Scientiae Circumstantiae.Vol.23 (2003), p.94
(in Chinese) [22] Bo Zhang,Hong Mei and Yongsheng Zhao:Global Geology.Vol.20 (2001), p.175(in Chinese) [23] R.V.Erik,Richard L.S and M.C.Andre:Environ.Sci.Technol.(2013)p.1 [24] Chunsheng Fang:Journal of Jilin University(Earth Science Edition).Vol.41 (2011), p.293(in Chinese) [25] Huili Gong,Wenji Zhao and Xiaojuan Li:Groundwater in the geographic information system-design, development and application.Science Press,Beijing(2006) (in Chinese) [26] B.Dixon:Applied Geography.Vol.25 (2005), p.327 [27] G.Alexandra,P.Christos:Environmental Geology.Vol.49 (2006), p.653 [28] V.Uddameri,V.Honnungar:Environmental Geology.Vol.51 (2007), p.931 [29] M.M.Thomson.Remediation Technology Overview,Second Workshop on the Remediation and Management Policies for Contaminated Sites (2011) [30] S.S.Suthersan,F.C.Payne.In Situ Remediation Engineering.CRC Press,Boca Raton (2005) [31] W.C.Anderson: Remediation Technologies Screening Matrix and Reference Guide, Md: American Academy of Environmental Engineers

Introduction Geosynthetic materials are new types of geotechnical engineering materials.
Various types of synthetic polymers are made from chemical fibers, plastics, synthetic rubber and other raw materials.
The development of modern geosynthetics is based on synthetic materials—plastics, synthetic fibers, and synthetic rubber.
The sources of synthetic materials are abundant and the weight of synthetic materials Light weight, small size, easy construction and installation.
Journal of Beijing Institute of Clothing Technology (Natural Science Edition) 38(4) (2018) 45-51

The white color indicates high-density material and the black indicates low-density material, which serves as the basic principle to analyze the rock meso-damage by CT images.
Journal of Geophysical Research, 85(1980): 7072-7090 [5] Kranz R L.
Journal of Geophysical Research, 73(4), (1968) 1417-1432 [8] Scholz C H.
Journal of Geophysical Research, 98, B2 (1993) 1889-1900
Sci., 34(3),(1997) 4-375 [19] Wu Yanqing et al.Progress in Natural Science, 10(9) (2000) 830-835 (In Chinese)

Materials and Method 2.1.
Raw materials and chemicals Purple garlic ingredients were purchased at the Hoc Mon wholesale market, Ho Chi Minh City, Viet Nam in October 2020.
The efficiency of extracting polyphenols from plant materials depends on the type of solvent used, especially. the polarity of the solvent.
The solvent/material ratio is the factor affecting the extraction ability.
Chin Tea Polyphenols and Alkaloids Content Using Soxhlet and Direct Extraction Methods World Journal of Agricultural Sciences 9 (2013) 1737

The monographs run chronologically; it is a complete list of the books published in this field including selected applications to physics and materials science.
[21] Mechanical Spectroscopy of Metallic Materials.
Published in: Internal Friction in Metallic Materials.
Materials Science.
Materials Science, 5, 15 (2005).

Application of Rough Set Feature Selection in the Hazard Assessment of Debris Flow LI Ju1, a, CHANG Jinyi1,b , WANG Xing2, WU Xiaobiao1 1 School of Computer Science and Engineering, Chang Shu Institute of Technology, Changshu, Jiangsu, China 2College of Atmospheric Sciences, Nanjing University of Information Science & Technology, Nanjing, Jiangsu, China aliju@284532@163.com, bchangjy@cslg.edu.cn Key words: rough set; debris flow,attribute reduction,value reduction Abstract.
The importance of property In decision-making system , is defined as In decision-making system , the attribute importance of is defined as Application of Rough Set Theory in Debris Flow Hazard Assessment The selection of data and discrete data This attributes were selected from a debris flow, a: The maximum amount out of; b: Drainage area;c: Main channel length;d:Watershed relative height; f: Cut density;g: Maximum rainfall; h: Loose solid material reserves; D: Risk Level Table 1 No. a b c d f g h D 1 8.99 50.0 9.00 2.82 15.61 100.41 7000 1 … … … … … … … … … 4 0.17 21 1.92 1.06 5.11 40.21 11.11 2 Table 2 No. a b c d f g h D 1 1 1 1 2 1 2 1 1 … … … … … … … … … 4 0 0 0 0 0 0 0 2 Calculate posC(D): U/{a}={{1,3},{2,4}},U/{D}={{1,3},{2,4}},U/{b}={{1},{2,3,4}},U/{c}={{1},{2,3,4}},U/{d}={{1},{2,3,4}},U/{f}={{1},{2,3,4}},U/{g}={{1,2},{3},{4}}U/{h}={{1,3},{2,4 }},U/{C-a}={{1},{2},{3,{4}},U/{C-b}={{1},{2},{3},{4}},U/{C-c}={{1},{2},{3},{4}},U/{C-d}={{1},{2},{3},{4}},U/{C-g}={{1},{3
The decreasing order of importance of attribute:a=g=h>b=c, the impact of the maximum amount out of, maximum rainfall, loose solid material reserves on decision outcomes is greater.
References [1] Major J J.and Iverson R M.Debris-flow deposition:effects of pore-fluid pressure and friction concentrated at flow margin[J].Geological Society of American Bulletin,1999.111(10): 1424-1434 [2] Hungr O.Analysis of debris flow surges using the theory of uniformly progressive flow[J].Earth Surface Processes and landforms,2000,25:483-495 [3] Gregoretti C.The initiation of debris flow at high slope:experimental results[J].Journal of Hvdraulic Research,2000,38(2):83-88 [4] Tamotsu Takahashi.Debris Flow.Published for International Association for Hydrautic Research by A.A.Balkma.Rotterdam Brookfield.1991 [5] Allen P A.Earth Surface Processes[M].Victoria:Blackwell Science Limited,1997.

Table 2 denotes the material parameters and elements of the cam and the pin gear.
Table 2 Material properties and elementof fe model Part Element Meterial EX(N/m2) DENS(kg/m3) PRXY Cam, Pin gear plane183 45# steel 2.09×1011 7.8×103 0.269 The contact pin number is variable when meshing, so that it is needed to refine the mesh in contact area.
Acknowledgment The authors thank National Natural Science Foundation of China (Grant No. 50905127), Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20091208120002) and Tianjin High School Science & Technology Fund Planning Project (Grant No. 20080405) for the financial supports that make this research possible.
Huang, and B.J.Lin．Geometric Design of Roller Gear Cam Reducers．Journal of Mechanical Design, ASME, 1999, 121(1):172-175 [2] Figliolini G., Rea P., Angeles J.
,Analysis of a spiral bevel gear’s tooth contact stress, Mechanical science and technology for aerospace engineering, 2007, 26(10): 1268-1272