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Then take full consideration into material availability and research scale size and research scope and size accuracy requirement.
Journal of natural disasters. 1993, 2(2):1-7
Survey of the science and technology, 2004(6):38- 40
Journal of Mountain Science, 2007, 25(2):197-201
Journal of Hebei normal university. 1997, (3):329-333

(5) = the unit weight of the material.
Acknowledgements This work was financially supported by the National Natural Science Foundation of China (Grant No.50968007) ,the Cultivation Plan of Young Scientists (Star of Jing gang) in Jiangxi Province (Grant No. 2010DQ01800) and the Science and Technology Research Project of Jiangxi Provincial Department of Education(Grant No.
Journal of Earthquake Engineering 2000; 4(3):227-301
Journal of Structural Engineering (ASCE) 1975; 101(1):109-129 [4] Bielak J.
Journal of Geotechnical and Geoenvironmental Engineering (ASCE) 1999; 125(1):38-48

The fishery resources are also the early development of human marine resources, marine fishing industry has been as one of the important material basis for human survival and development.
An overview of the development of fishery equipment and engineering science and technology in China[J].
Proceedings of the Institution of Mechanical Engineers Part M-Journal of Engineering for the Maritime Environment, 2019, 233(1): 108-123
Journal of Zhejiang Ocean University (Natural Science Edition), 2020, 39(04): 353-357
Journal of Agricultural Engineering, 2017, 33(01): 90-94

Its main task is to analyze the dynamic changes of water quality status according to the main material composition of the main water source in arid areas and a given water quality standards, thus make a quantitative description which will provide a scientific basis for the development and utilization,and for the protection and planning management of water resources in arid areas.
Materials and methods This study mainly uses fuzzy set theory and composite fuzzy matter-element theory to conduct a comprehensive evaluation, through the establishment of mathematical model of urban surface water quality in arid areas.
Journal of shandong university (engineering science), 2007, 37(6):91-94

Meanwhile, the traditional soldering equipment, PCB materials and electronic chips have to be changed because they are not suitable to these lead-free solders.
The material of Printed Circuit Board (PCB) is N4000-13Si of Nelco, 20 layer board, hole diameter 1.5mm and component lead diameter 0.9mm, traditional iron and flux.
Bergman, NCMS Lead-Free Solder Project, Journal of SMT. (2000) [3] Soldertec at Tin Technology Ltd, Second European Lead-free Soldering Technology Roadmap, February 2003.
Download at http://www.nepss.org/presentations/SEMI_Europ/leadfreesolderingjapan.pdf [5] Katsuaki Suganuma, Technology of Lead Free Soldering [M] (In Chinese), Science Publishing Company, Beijing, 2004, pp. 26-56.

Washington, “Modeling and reduction of centrifuging in magnetorheological(MR) transmission clutches for automotive applications,” Journal of Intelligent Material Systems and Structures, vol.16, no. 9, 2005, pp. 703-711
A., Cobanoglu, N. , Liu Y. and Fuchs A.,”A high-torque magneto-rheological fluid clutch”, Proceedings of SPIE Conference on Smart Materials and Structures, San Diego, March 2002
[3] Won, Y.D., Su, S.Y., Chang, P.H., Kyu, C.S. and Hun, P.C., “Design of a novel MR rotary brake”, 2009 World Congress on Computer Science and Information Engineering

Dynamics of a Radial Active Magnetic Bearing System during Maneuvering Flight Kai Zheng Aviation Key Laboratory of Science and Technology on Power Transmission of Aeroengine, AVIC Shenyang Aeroengine Research Institute, Shengyang 110015, China Zhengkai_xjtu@126.com Keywords: magnetic bearing, maneuvering flight, Stability Abstract.
At present the implementation of AMB in jet engines is hindered by several problems like enormous thermal and mechanical load[9], limited performance of magnetic material, severe working condition, etc.
Rubertus, "Application of high temperature magnetic materials," Magnetics, IEEE Transactions on, vol. 36, pp. 3373-3375, 2000
Zhu, "Active vibration control based on linear matrix inequality for rotor system under seismic excitation," Journal of Sound and Vibration, vol. 314, pp. 53-69, 2008

Ink connection material, additives, developer are the liquid material [2].
At present the highest accuracy of filter market can reach 5 u m, which can eliminate impurities including some protein, bacterial microorganisms and talcum powder and fine material.
Acknowledgement This study is supported by National Science and Technology Support Program (2012BAF13B05) and Printing Equipment Inspection and Innovation Design Team of Beijing Institute of Graphic Communication (23190112094) and Institute Level Key Projects Funded by Beijing Institute of Graphic Communication (No. 23190112029).
References [1] KONG Ling: Journal of Shandong University of Technology Vol. 17 (2003), p. 80-84 [2] WANG Ai-wei: Development and the ore search of suction filter (MS, Beijing University of Chemical Technology, China 2008) [3] LIU Ning: The plate washer sewage treatment (MS, Beijing Institute of Graphic Communication, China 2012) [4] CHEN Hong.

Resistance temperature sensor is a wide range of temperature measurement devices, and any other temperature sensor unparalleled advantage in the range of -50 to 600 degrees, high accuracy, good stability, resistance to environmental interference [3].The two conductors of different materials, the thermocouple temperature sensor is interconnected at some point, this connection point heating potential difference appears in the unheated parts.
In fact, allowable working pressure not only with the protection of the diameter of the tube material, wall thickness, its structure, installation method, into the depth of the measured medium flow rate and the kind.
[2] M.J.Tang .ARM-based programmable logic controller design,Nanjing University of Information Science, 2007
S.X.Fang.The industrial network topology and its protocol analysis ,Journal of Computer Applications, 2002 (4):

(1) Where P, V,T represent the pressure, volume and absolute temperature of gas in balance; n, r represent the amount of gas material and the gas constant; a, b are the Vander Waals' constant; k is the polytropic index.
Put the above formula into (2), then the simple formula is: (3) The amount of gas material is: put it into (3), getting the following formula: (4) The resilience of the air spring is: (5) Where Pat is the atmosphere pressure.
The main and attach chamber could be got from the formula (1): (7) (8) The volumetric changes of the main or attach chamber are:,, the amount of gas material of the auxiliary is: , (9) take the gas in the pipe as object of study: (10) In the formulas from (7) to (10):where q is the gas flow, P0 is the initial gas density, Rβ, is the flow resistance coefficient, β is the damping characteristics, in the formula: Ap is the area of surge pipe.
Journal of Liaocheng Teachers University, 2003, 16(3): 25-26
University of Science & Technology China press, 2005, 8(1): 208-210.