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Improvement of consumer properties of materials and development of new advanced metals and alloys stimulate the development of analytical instruments to provide the technological process, decrease the detection limits, improving the accuracy and rapidity.
In addition, the output of the secondary ions strongly depends on the nature of chemical bonding in materials (ionic, covalent and metallic), and this can lead to ambiguity in the depth profiles at the junction of dissimilar materials [10].
Carter, First principles assessment of ideal fracture energies of materials with mobile impurities: implications for hydrogen embrittlement of metals, Acta Materialla. 52 (2004) 4801-4807
Azkarate, Compatibility of materials with hydrogen.
Shvachko, Studies using negative secondary ion mass-spectrometry: hydrogen on iron surface, Surface Science. 411 (1998) 882-887

And according to the mechanics of materials, the formula of stress distribution in the roof is corrected.
Then according to the material mechanics knowledge, the bending moment distribution function of the roof beam can be obtained by solving differential equation.
References [1] Panfeng Gou , Sijiang Wei, Sheng Zhang．Numerical Simulation of Effect of Horizontal Stresses at Different Levels onStability of Roadways [J]．Journal of Mining & Safety Engineering, 2010(2)：143-148（In Chinese） [2] Xiaojun Li , Ruifu Yuan , Xingdong Zhao .
Chinese Journal of Rock Mechanics and Engineering , 2005, 24( 16) ： 2803- 2813（In Chinese） [5] Minggao Qian, Pingwu Shi.
The determination and control of the loose ring thickness of mining roadway [J]．HeNan：Coal science and technology, 2003（In Chinese） [10] Hui Zhang.

They can be fabricated ​​from various types of materials.
Cosmeleata, Biomaterials and shape memory alloys, in Materials Science and Engineering Handbook (in romanian), Ed.
[10] Reclaru L; Unger RE; Kirkpatrick CJ; Susz C; Eschler PY; Zuercher MH; Antoniac I; Lüthy H; Ni-Cr based dental alloys; Ni release, corrosion and biological evaluation, Materials Science and Engineering C-Materials for Biological Application 32 (2012) 1452-1460,
[12] Miculescu F; Bojin D; Ciocan LT; Antoniac I; Miculescu M; Miculescu N; Experimental researches on biomaterial-tissue interface interactions, Journal of Optoelectronics and Advanced Materials, 9 (2007), 3303-3306
[14] Antoniac I; Vranceanu MD; Antoniac A; The influence of the magnesium powder used as reinforcement material on the properties of some collagen based composite biomaterials, Journal of Optoelectronics and Advanced Materials 15 (2013) 667-672

Materials and methods Vanadium bearing solutions with iron ions were prepared by dissolving NaVO3·2H2O, FeCl2·4H2O and hydrochloric acid to be feed solutions for solvent extraction.
Acknowledgments This work was financially supported by the National Science Foundation for Distinguished Young Scholars of China (Grant No. 51125018), National Basic Research Program of China(973 Program, 2013CB632601）, the National Natural Science Foundation of China (Grant No. 51004091, 21106167, 21006115, 51104139) References [1] X.J.
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Journal of rare metals in Chinese, Vol. 34(3) (2010), p. 400-405 [10] X.Y.

The jet system provides a fluid seal against heat, moisture and mass transfers between the separated areas without holding up traffic of people, materials, vehicles, or objects.
Safety Science Technology, 2006, 27(4):13-16
China Safety Science Journal, 2008, 18 (5) :55-60
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International Journal of Refrigeration, 2006(692-699).

Materials and methods BPNN.
Fan: Lecture Notes in Computer Science, Vol.3173 (2004), p. 323-331
Luo: Journal of northern jiaotong university, Vol.19 (1995), p. 541-543 (In Chinese)
Luo: Journal of northern jiaotong university, Vol.19 (1995), p.528-532 (In Chinese)
Yuan: Journal of Jilin University of Technology (Natural Science Edition), Vol.33 (2003), p. 45-50 (In Chinese)

Journal of Membrane Science 309(2008)73–81
Journal of the Mechanical Behavior of Biomedical Materials 4(2011)1228–1233
Journal of Biomedical Materials Research A 94(2010)1321-1331
Materials Today 13(2010)14–22
Materials Science and Engineering: C 2012; 32:222-227

With the help of a water-knife or a hydro-abrasive ray – paser, it is possible to cut all possible materials, such as metals, alloys, plastic materials, laminates, porous materials, resin battened with fibers, wooden material, glass, ceramics, stone, textile, leather, felt, organic food.
Materials Science Forum, Vol. 713, 2012, p. 61-66
Applied Mechanics and Materials, Vol. 308, 2013, pp. 111-114, ISSN 1660-9336
Janak, Visual reconstruction and optimization of real workplace on the base of spatial digitisation, Applied Mechanics and Materials, Vol. 308, 2013 p. 175-178, ISSN 1660-9336
International Journal of Advanced Manufacturing Technology, Vol. 41.

Introduction Recently Natural fibres, as reinforcement material, have attracted researchers because of their advantages over other familiar materials.
Materials and Method 2.1.
Casting of the composite materials is done in this mould by hand layup process.
Journal of Materials and Design, volume 31, (2010), 508–513
Sapuan, “Mechanical properties study of pseudo-stem banana fibre reinforced epoxy composite”, The Arabian Journal for Science and Engineering, Volume 32, Number 2B, 2007

Effects of Slag Refining and Vacuum Treatment on De-phosphorus from MG-Si Using CaO-SiO2-CaCl2 Slag Liu-qing HUANG1,a, Hui-xian LAI1,b, Ming FANG1,c, Cheng-hao LU1,d, Juan CHEN1,e, Yan-xu LIN1,f, De-qin YU1,g, Jin-tang LI1,h, Wen-hui MA2,i, Jian-ning SHEN3,j and Xue-tao LUO1,k 1Department of Materials Science and Engineering, Xiamen University, Xiamen 361005, P R China 2National Engineering Laboratory for Vacuum Metallurgy, Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology, Kunming 650093, P R China 3Ningxia Electrical Power Ltd.
Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material.15 (2008)671-677
EPD Congress 2013 TMS (The Minerals, Metals & Materials Society), (2013) 229-236
Lupis, Chemical Thermodynamics of Materials, Elsevier Science Press, New York, 1993
Metallurgical and Materials Transactions B.19(1988)433-439