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And its expression [10] is (1) Suppose that the coal is isotropic material and only carries the gravity stress, so its primary stress σ1 is vertical stress, and σ2, σ3 are horizontal stress and σ2=σ3.
Acknowledgements This work was financially supported by the National Eleventh Five-year Key Science & Technology Project of China (No. 2009BAK54B03), National Natural Science Foundation of China(No. 50834005) and The basic research universities special fund operations(No. 2010YZ05) References [1] Wang K, Zhou A T, Zhang J F and Zhang P: Safety Science Vol. 50(2011), P. 835 [2] FRID V: Journal of Applied Geophysics Vol. 38(1997), P. 97 [3] Pan Y, Li A W and Qi Y S: Journal of China University of Mining & Technology Vol. 19 (2009), P. 49
[4] LI S G and ZHANG T J: Mining Science and Technology Vol. 20(2010), P. 209 [5] JIANG C L: China University of Mining Journal Vol. 23 (1994), P. 1.
[7] CHENG W Y, LIU X Y and WANG K J: Journal of China Coal Society Vol. 29(2004), P. 57 [8] ZHANG Q, SUN Y R and WANG X Y: Mining Safety & Environmental Protection Vol. 34(2007), P. 21 (In Chinese) [9] CHENG W M, WANG G and ZHOU G: Journal of Chongqing University Vol. 32(2009), P. 314 [10] YU Q X: Mine gas prevention and control (China University of Mining and Technology Press, Xuzhou 1992)
[12] SUN S Z: The characteristics of crustal stress and its application in coal mining (Shandong University of Science and Technology, Qingdao 2003)

The property indicates a perfect potential application in drug delivery materials.
Introduction Block copolymers constituting physicochemically dissimilar polymer chains have great application potential in a variety of fields such as targeting drug carrier[1], nanofabrication[2], polymer surfactant[3] and medical macromolecular materials[4].
The property can be applied in drug delivery materials.
Science, 300(2003): 615-618
Euopean Polymer Journal. 46(2010): 1932-1939 [7] J.K.

Materials and Methods Fabrication of β-tricalcium phosphate foam granules.
Deba, Tailoring brushite for in situ setting bone cements, Materials Chemistry and Physics 130 (2011) 1139–1145
A Comparison Between Porous Materials and Flat Materials, Journal of Functional Biomaterials 2 (2011) 308–337
Ishikawa, Fabrication of self-setting β-tricalcium phosphate granular cement, Journal of Biomedical Materials Research - Part B Applied Biomaterial 106 (2018) 800–807
Tsuru, Fabrication of interconnected porous β-tricalcium phosphate (β-TCP) based on a setting reaction of β-TCP granules with HNO3 followed by heat treatment, Journal of Biomedical Materials Research Part A (2017) 1–8

Introduction Today's manufacturing industry is facing the challenge of difficult-to-cut materials and difficult-to-cut materials in modern manufacturing industry is increasingly important, especially in the aerospace, automotive, tooling and other manufacturing fields, its outstanding material properties, such as high strength, heat resistance, wear resistance, corrosion resistance, etc. to improve product performance has made great economic benefits.
Faced with high hardness materials and the complexity of the molded parts, special processing to become a hot research issue processing field [1-3].
The materials of parts which maybe touch the electrolyte are stainless steel.
Journal of Materials Processing Technology，2007（189）: 466-472
Journal of Materials Processing Technology 192–193 (2007) 470–477

Ballester1, g 1Department of Materials Science and Metallurgical Engineering, Complutense University of Madrid, Av.
Conductive pili could possibly play a role in bacterial interactions and in inter/intra species signalling, and could lead to biotechnological approaches for novel materials.
Materials and methods Bacterial strain and culture conditions.
In order to better understand how A. hydrophila developed the filaments on solid surfaces, cell attachment on different materials was tested: highly ordered pyrolytic graphite (HOPG), pyrite coupons and glass slices.
Ramsay, Review: microbial mechanisms of accessing insoluble Fe(III) as an energy source, World Journal of Microbiology and Biotechnology. 19 (2003) 215-225

Zharikova4,d 1,2,4Federal State-Financed Educational Institution of Higher Learning «Komsomolsk-na-Amure State University», Russia 3Federal state budgetary institution of science Institute of applied mathematics of the far Eastern branch of the Russian Academy of Sciences, Vladivostok, Russia anaj198282@mail.ru, bjan198282@mail.ru, ckhromovai@list.ru, devgenia131094@mail.ru Keywords: Rigid plastic body, finite strain tensor, strain rate tensor.
Analytical solutions were obtained for the fields of strain tensors observed in shells of various materials during their deformation.
We assume that below the break line L [5] the material is undeformed: xi,j0-=δi,j
Therefore, a model with a continuous field of displacement velocities is more preferable for real materials, and the analysis of the dependences, in contrast to the plane deformation of the sample, is made taking into account the geometry (change in thickness and width of the sample).
Khromov, Strain and destruction of a rigid plastic strip under the tension, Journal of the Russian Academy of Sciences, Mechanic of a solid body. 1 (2002) 136-142

The pump wear and tear has relation to the velocity, mass concentration, grain size and flowage of the materials it pump, and the materials of rotor and other factors.
In practical application, we choose rotational speed and pressure according to the abrasion resistance of materials it pump.
Journal of China coal. 2004, (12) : 36 to 38.
JOURNAL of COAL SCIENCE & ENGINEERING, 2006, 12 (2) : 75 ~ 79
Journal of instrument and meter. 2009 (8).

Referencing [5, 6], the used materials are elastic materials, such as: Aluminum foam, Quartz sand, Felt, Rubber and so on.
According to use Isight and Ls-Dyna, not only for the critical geometry is optimized, but also some Properties of materials are optimized.
Ma: Journal of Test and Measurement Technology, Vol. 19(2005) No.3, p.249 (In Chinese)
Yan: Mechanical Vibration Isolation Technology (Shanghai Science and Technology Literature Press, China 1985)
Zhang: Journal of Projectiles, Rockets, Missiles and Guidance, Vol. 30(2010) No.3, p.223 (In Chinese).

This material has low heat conductivity and large coefficient of linear expansion, so it is the typical difficult-to-cut material.
The material of work piece was 3Cr1Mo1/4V and dimension was 110×90×70.
The material of cutter was YT535 and structure was wave edge.
Journal of harbin university of science and technology 10(6): 88-91 (2005).
Journal of harbin university of science and technology 2(5): 1-3 (1997).

Visible-Light-Induced Photocatalytic Activity of boron-doped BiVO4 LI Dan, SHAN Lian-weia, WANG Gui-lin, DONG Li-min, LI Wei, HAN Zhi-dong College of Material Science and Engineering, Harbin University of Science and Technology, Key Laboratory of Materials Research and Application of Heilongjiang Province, Harbin, 150040, China aShlw0531@163.com(*Corresponding author) Keywords:BiVO4; Sol-Gel; Boron doping.
Advanced materials 2012, 24(15):2014-2018
In: Applied Mechanics and Materials: 2013; 2013: 654-660
Journal of Alloys and Compounds 2013, 548:70-76
Journal of Hazardous Materials 2009, 167(1–3):911-914.