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Micro relative motion amplitude is small, its cause material injury usually appeared in two forms: Micro lead to wear: micro between the surfaces can cause surface wear, produce the material loss and component size change, cause member bite, loose, power loss and noise increase or formation pollution sources.
Various kinds of applied alternating load produce micro, can cause material wear and fatigue crack formation, resulting in the thread loosening, bite dead, fracture or fittings fatigue life down.
In view of the above factors, in order to improve pipe thread sealing performance, the actual should be paid attention to in the application from three ways: enhance the internal and external thread type and size of the processing requirements, make its as far as possible consistent, but there are certain limit, namely in the economic and the possible conditions guarantee in a certain tolerance range; inside and outside threaded and after, through some tightening torque make internal and external thread itself materials produce certain deformation to fill a part of the clearance; between the inner and outer thread has plasticity to join the packing.
Acknowledgements This work was financially supported by the Science Foundation of Huuaihai Institute of Technology, (Grant No,Z2009007).
References [1]X.C.Li,Y.Z.Hao: MACHINERY MANUFACTURING ENGINEER, 3(2000),p.32-33 [2] X.C.Li: OIL-GASFIELD SURFACE ENGINEERING,9(1999),p.58-60 [3]J.B.Liu,E.Zhang,S.Y.Wang: Journal of Daqing Petroleum Institute,2(2006),p.51-53 [4] D.Y.Ying: PROCESS EQUIPMENT & PIPING, 3(1999),p.44-49 [5] D.Y.Ying: PROCESS EQUIPMENT & PIPING, 4(1999),p.43-48 [6] L.X.Gao,Y.Jin: Journal of Shanghai Jiaotong University,10(2004),p.129-132

Zaikov, Complex aerohydrodynamic research and the effectiveness or arresting dispersed particles for barbotage-rotation, Journal of Applied Polymer Science. 104 (4) (2007) 2088-2091
Khalatov, Theory and practice of swirling flows, AS USSR, Institute of Engineering Thermophysics. - Kiev: Science.
The Russian Journal of applied physics. 54 (7) (2009) 1063-1065
Tropea, Modeling rotating and swirling turbulent flows: a perpetual challenge, AIAA Journal, 40 (10) (2002) 1984-1996
Ganesan, Study on the effect of various parameters on flow development behind vane swirlers, International journal of thermal sciences, 47 (9) (2008) 1204-1225

Various defects on welded metal can lead to failure of material, so that it needs some routine examination to maintain the material quality.
MIT generates an image based on electrical conductivity or magnetic permeability of material without causing material damage.
Chinese Journal of Chemical Engineering. 20, No. 2 (2012) 406-410
International Journal of Information and Systems Sciences. 2, No.4 (2006) 607-609
IEEE Sensors Journal. 2 (2010) 1-4.

According to the results of thermal properties measurements by laser flash technique, the carbon nanofiber mats possess great potentials in applications for thermal management materials.
Carbon nanofibers with high thermal stability and high specific extinction coefficient have long been widely applied as functional materials or reinforcement materials in all kinds of composites [1-3].
Therefore, carbon nanofiber mats possess great potentials in applications for thermal management materials.
Acknowledgement This work was financially supported by China Aerospace Science and Technology Corperation.
Sun: Journal of Inorganic Materials Vol. 24 (2009), p. 310, In Chinese [4] Nayandeep K.

The results suggest that the adsorption on CTMAB zeolite involves adsorption process and distribution role and zeolites performs well as reusable materials for adsorption.
Materials and Methods 2.1 Preparation of CTMAB zeolite The surface modification of zeolite with cationic surfactant was done by adopting previous technique [7,8].
These results indicate that the zeolites performs well as reusable materials for adsorption.
The results suggest that the adsorption on CTMAB zeolite involves adsorption process and distribution role and zeolites performs well as reusable materials for adsorption.
Journal of Solid State Chemistry, 2005, 178(1): 142–152

GRACoL7 breaks with tradition by raising gray balance to a more important status to realize the different printing materials with the same appearance.
The purpose of the G7 is in the printing process to realize "shared appearance" between the different printing methods or different materials [2].A good method to define print 'appearance' is with a characterization data set containing colorimetric (CIE or spectral reflectance) values from a standard characterization target like the IT8 is shown fig1.
NPDC ensures a density match and better contrast between multiple devices and materials.
Owing to the gravure printing, the plate-making is engraving, the materials are newsprint paper and Kraft paper which basis weigh is 35~70g/m2.The ink viscosity is low.
We also thank the ShaanXi University of Science & Technology and JiNan University for their experimental equipments.

Journal of Tsinghua University (Science and Technology), 2000,40 (10) :120-124
Journal of Nanjing University of Science and Tecknology, 2001, 25(1):71-74
JOURNAL OF SHANGHAI JIAOTONG UNIVERSITY, 2002, 36(9):1351-1354
Journal of Computer Research and Development, 2002,39(6):696-700
Journal of Computer Integrated Manufacturing System, 2001,7(4): 58-61

Materials and methods Materials The bentonite used in this study was obtained from WeiFang, ShanDong.
[5] SUN Hongjuan, Peng Tongjiang, Liu Fusheng: Journal of SWUST Vol. 17(3), 2002, p. 74-78
A.: Environmental science & technology Vol. 29(1995), p. 3022-3028
[14] Seung Yeop Lee, Won Jin Cho, Kang Joo Kim, et, al.: Journal of Colloid and Interface Science Vol. 284(2005), p. 667-673
N.: Applied Clay Science Vol. 19(2001), p. 11–26

The strength response of rings materials under high strain rate deformation was described by using the well-known Johnson–Cook constitutive relationship.
Introduction An electromagnetic expanding ring technique is one of the methods for determining mechanical properties of materials under high-strain-rate loading conditions [1].
This work was supported by the Ministry of Science and Higher Education, Poland (Grant No. 0025/R/T/00/2009/09).
Materials Park, OH: ASM International; (2000), p. 939¸1270
Baker, Ring fragmentation predictions using the Gurson model with material stability conditions as failure criteria, International Journal of Solids and Structures, 39, (2002), p. 3555¸3580

When conducting numerical analysis in this paper, Both the 6m high embankment fill and the 25m thick soft soils as well as 3m thick hard clay were considered as Mohr-Coulomb materials, while the horizontal reinforcement, pile and pile-cap were considered as Linear-Elastic materials.
All of the material parameters are listed in Table 1.
Fig.1 Numerical model Fig. 2 Variations of the soil pressures with time Table 1 The physical and mechanical parameters of the materials Materials [m] [kN/m3] [kN/m3] [m/d] [Mpa] [kPa] [°] Embankment 6 20 - - 30 0.25 0 30 Soft soils 20 12.5 17.5 0.00124 3 0.35 1.5 9 Hard soils 3 12.5 17.5 0.00124 25 0.25 18 22 Pile 21/25 25 - - 30000 0.167 - - Pile-cap 0.35 25 - - 30000 0.167 - - Results and Analyses Fig. 2 shows the variations of the soil pressures with time.
Chen and N.Jia: Chinese Journal of Transportation, Vol. 18(2005) No.3, p.7 (In Chinese)
Gabr: Journal of Geotechnical and Geoenvironmental Engineering, Vol. 128 (2002) No.1, p.44