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But because the critical speed is relevant with rotor’s materials, geometric shape, size, structure, supporting and working environment, and many other factors, calculation value and the actual value often exist certain error, thus increasing critical speed calculation accuracy is the emphasis of research [4].
Dou: Journal of Vibration and Shock, Vol. 28 (2009) No.5, p.87
Ai: Journal of Vibration and Shock, Vol.29 (2010) No.11, p.245
Zhang: Journal of Shenyang Institute of Chemical Technology, Vol.21 (2009) No.1, p.74
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Materials and methods The research site is in the upper reaches of the Minjiang River between the Tibetan plateau and Sichuan Basin, situated at latitude 103°10' N and 103°54'N and longitude 31°15'E andl32°32' E.
Journal of Liaocheng University (Nat.
Journal of Henan Normal University (Natural Science), 2009, 37(2): 120-124.
Journal of Jilin Agricultural Sciences, 2011, 36(4):61-64.
Southwest China Journal of Agricultural Sciences, 1996, 9(Special Issue on C.R.): 147-153.

Raman spectra were a useful tool to observe the stress of semiconductor materials without damaging the sample.
There existed big mismatch of lattice between AlGaN and GaN materials.
Raman spectra were a useful tool to observe the stress of semiconductor materials without damaging the sample.
Elastic deformation in strained nitride semiconductor materials can change states of binding atom and the frequencies of the phonon modes.
While the excited laser was switched to 325nm, Raman peaks related GaN and AlGaN materials were observed.

Klepaczko, Crack Dynamics in Metallic Materials, 1990
Kron, Theory of hot crack formation, Materials Science and Technology. 21(5) (2005) 521-530
Tubol'tseva, Calculation of Impeded Shrinkage Casting Processes in Sand Layer, Materials Science Forum, 870 (2016) 516-522
Olusegun, Measuring the stress, strain and strain-rate in heat treated medium carbon steel samples and finding the constituted material related properties, African Journal of Mathematics and Computer Science Research, 3 (2010) 038-048
Fedik, Thermal stress resistance of materials, 2008

Journal of Applied Engineering Science, Vol. 12 (1) (2014), pp 1-10 [9] N.
Applied Mechanics and Materials.
Applied Mechanics and Materials.
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Journal of Applied Engineering Science, Vol. 12 (1), (2014), pp 37-44 [15] N.

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[7] American Welding Society.Test Methods for Evaluating the Resistance Spot Welding Behavior of Automotive Sheet Steel Materials.2012;AWS D8.9M: 2012
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However, because of their hardness and chemical inertness, polishing of these materials is difficult.
The transformed materials are then removed mechanically by the rubbing between the disk and PCDC.
Rabinowicz, Friction and wear of materials, 2nd ed., John Wiley & Sons, 1995
Murty, et al.: Journal of materials Science 8 (1973) 437-442
Kosaca, et al.: Diamond and Related Materials 7(8) (1998) 1108-1117

The critical load is related to occurrence state of rock stratum , rock mass material and breaking span of key roof stratum.
Acknowledgments Financial support for this work was provided by the National Natural Science Foundation of China (No. 40572155).
Chinese Journal of Rock Mechanics and Engineering 2002; 21(8): 1174－1177 [in Chinese]
Journal of China Coal Society 2007; 32(4): 337-340 [in Chinese]
Chinese Journal of Geotechnical Engineering 2007; 29(12): 1763-1766 [in Chinese]

Sun and X.S Li: Advanced Materials Research.
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Fenton Degradation of Methylene Blue by CuFeS2 Ultrafine Powders Daxin Liang1, a *, Jian Li1,b, Lu Li2,c and Guangsheng Pang2,d 1 Key Laboratory of Bio-based Material Science and Technology, Ministry of Education, Northeast Forestry University , Harbin 150040, China 2 State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, China aliangdaxin@yahoo.com, b nefulijian@163.com, clilu.2428@163.com, dpangs@jlu.edu.cn Keywords: Fenton, degradation, CuFeS2, chalcopyrite, methylene blue Abstract.
Experimental Details Materials Chalcopyrite is purchased from ALFA AESAR, methylene blue and peroxide (30%) are purchased from Sinoreagent.
The materials are used without further treatment.
[8] Ulson De Souza Selene Maria Arruda Guelli, Forgiarini Eliane, and Ulson De Souza Antonio Augusto, Toxicity of textile dyes and their degradation by the enzyme horseradish peroxidase (HRP), Journal of Hazardous Materials, 2007. 147(3): 1073-1078
[20] Muruganandham M. and Swaminathan M., TiO2 - UV photocatalytic oxidation of Reactive Yellow 14: Effect of operational parameters, Journal of Hazardous Materials, 2006. 135(1-3): 78-86