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All the particles whose nominal diameters are larger than 74μm are classified as sand by API drilling fluid material standardization committee; nevertheless, it is sweeping and not precise.
Acknowledgement This research is partially supported by National Nature Science Foundation of China (No. 51174035, 50974023 and 50874019), National Science and Technology Major Project (No. 2011ZX05009-005), and, by Science and Technology Research Program of Hubei Provincial Department of Education (No.
[6] Weibing Zhu, Jingjiang Yan, Kinetical law of solids particles on a shale shaker, Chinese Journal of Mechanical Engineering. 2005, 41 (10): 231~234.IN Chinese
Journal of Machine Design, 2005, 22 (1): 50~52.IN Chinese

Analysis on vibration modal and noise radiation of cutter-workpiece for heavy milling processing Yanan Gonga, Yaonan Chengb, Xiaochun Aoc, Yizhi Liud, Fugang Yane Mechanical & Power Engineering, Harbin University of Science and Technology, Harbin, 150080 agynhaoren@126.com, byaonancheng@163.com, caxch@21cn.com, dlyz701119@tom.com, Keywords: vibration modal; noise radiation; noise field distribution; heavy milling Abstract: For improving heavy milling machining environment, take the vibration modal and noise radiation distribution of milling cutter-workpiece as the research object, according to the characteristics of milling, consider vibration and noise generation in the milling process comprehensively, first establish the geometry model of cutter-workpiece, and then conduct finite element modal simulation and calculate the vibration response, so as to predict the distribution of noise field, and analyze the noise radiation, finally verify the vibration noise distribution of cutter-workpiece
According to subsequent experimental conditions, the machine model selects vertical knee and column milling machine X5030A, the cutting tool selects Φ160mm milling cutter, the blade selects ISCAR- LNAW 1506PN-R-S blade, workpiece material selects steel 45, using the symmetrical milling mode, establish geometric model of the tool and the workpiece system.
Acknowledgements This research is supported by the national natural science Foundation of china (Project approval number: 51205095).
Journal of Mechanical Science and Technology. 2008, 22(4):708-713
Control the cutting noise [J]. journal of industrial technological economics, 1995

Supporting Complex Access Control Policy in PDM System Chunxiao Ye1,a, Yunqing Fu2,b and Hong Xiang2,c 1 College of Computer Science, Chongqing University, Chongqing, China, 400044 2 College of Software Engineering, Chongqing University, Chongqing, China, 400044 a yecx@cqu.edu.cn, byqfu@cqu.edu.cn, cxianghong@cqu.edu.cn Keywords: PDM, Security, Access control, Complex access Control policy Abstract.
Acknowledgements This research is supported by the National High Technology Research and Development Program of China (Project No. 2007AA01Z445) and the Natural Science Foundation of Chongqing, China (Project No.CSTC,2008BB2320) References [1] D.F.
Yu: Journal of Computer in Industry, Vol. 50 (2003) No.2, pp.179-193
Dong: Journal of Computer Aided Design & Computer Graphics, Vol. 13 (2001) No.11, pp.971-976.
Fu: Material Science Forum (to Be Appeared).

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

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

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 geopolymer concrete material is mainly formed by two constituents the source materials and the alkaline liquids.
An alumina-silicate material as the main materials for geopolymers should be dominated in silicon (Si) and aluminum (Al).
Otherwise, by-product materials such as fly ash, silica fume, slag, rice-husk ash, or red mud could be used as the source materials.
The concrete mixing procedure for this project was adjusted to obtain the proper homogeneity of dry materials and wet materials.
G.,, "Effect of types of curing on strength of geopolymer concrete," International Journal of the Physical Sciences vol.

Experimental Materials and Methods.
All reagents were commercial grade materials and were used without further purification.
Pure silicon carbide powder (an average of 10 mm grain size) were used as main Microwave heater material.
Hassan , Growth of nanostructured CdO by solid-vapor deposition, International Journal of the Physical Sciences, Vol. 6, No.17 (2011), 4176-4180 [4].
J.G.Lu, P.Ch.Zh.Fan, Quasi-one-dimensional metal oxide materials-Synthesis , properties and applications”, Mater.

EXPERIMENTAL MATERIAL AND METHODS Material.
According fatigue theory, the fatigue life of metal materials and structure take on logarithmic normal distribution.
The fatigue test results were statistical analyzed in normal distribution and according to GJB/Z 18A-2005 ‘Data reduction and presentation of mechanical property for metallic materials’.
Chinese Journal of Rare Metals,2008 ,32 (3) : 2742278
Computational Materials Science, 2009, 45: 1134-1141.

Many studies [9, 10] demonstrated that pervious concrete performance is highly dependent both on materials used and construction techniques adopted.
Materials characterization A standard CEM II 42.5R cement was used in the mixtures.
Jiang, Experimental study on properties of pervious concrete pavement materials.
Wang, Effects of some factors on properties of porous pervious concrete, Journal of Building Materials 8 (2005) 513-519
Neptune, Comparison of test specimen preparation techniques for pervious concrete pavements, Construction and Buildings Materials 25 (2011), 3480-3485