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Speaking of the physical property, the gallium nitride belongs to a direct bandgap material with an obviously super luminous efficiency; therefore, the gallium nitride has the dominate tendency than that of others materials.
Not only does GaN have the advantage of being a direct band gap material, it can be used with InN (2.0 eV) and AlN (6.2 eV) to form ternary and quaternary compounds and extend its direct band gap range to 1.95 - 6.2 eV with the corresponding wavelength extensions from the green frequency range to that of ultraviolet frequencies, allowing it to be used for expanded applications.
ESD Testing Results of GaN LEDs In terms of physical characteristics, GaN is classified as a direct band gap material that has a very advantageous edge in terms of luminous efficiency.
Gonda, Epitaxial growth of GaN/AlN heterostructures, Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures. 1 (1983) 250-253

The results indicated that when the torque is M1=100N·m, the maximum stress on the engagement pairs is 177.584MPa; when the torque is and M2=300N·m, the maximum stress on the engagement pairs is 329.607MPa, which were less than the yield limit of planetary gear materials, but it can meet the design and operation requirements of planetary gear of megawatt wind turbines yawing reducer.
The structure of gear and its material properties are shown in Tab.1.
[3] YANG Sheng-hua Applications of Substructuring and Submodeling in Calculations of the Gear Stress and Deformation [A].Engineering and Computational Mechanics in Science[C].
T., Mathis R., "An evaluation of stresses and deflection of spur gear teeth under strain,"ASME Journal of Engineering for Industry, vol.96(1), pp.85-93,1974
[11] LI Yong-xiang,BI Xiao-qin,ZHANG Jun-sun., "Loaded Contact Analysis of a StraightTeeth Face Gear by ANSYS,"Mechanical Science and Technology for Aerospace Engineering,vol.28(7),pp.931-937,2009.

Experiment Experimental Material and Experimental Scheme Taking Changguang coal as the experimental coal type, CaO and MgO as the chemical analytical reagents, the analyses on coal characteristics and ash composition of Changguang coal are shown in Table 1 and 2.Sieve the coal powder of Changguang coal pulverized in the ball mill by square-mesh screen with 250 meshes, keep the granularity of coal powder under 61µm; Sieve CaO and MgO through square-mesh screen with 300 meshes, respectively, and keep the granularity under 49µm.
Acknowledgements The authors would like to acknowledgements Science and Technology Foundation of Henan Province (102300410088).
Journal of Zhejiang University, Engineering Science, 2003, 37(2):225-230
[3] JIAO Youzhou，LUO Zhongyang，SHI Zhenglun，et al.Journal of Zhejiang University (Engineering Science) ,2008,42(6):977-983
Study on Q-phase cement and Preliminary Study on Symbiotic relationship between Q-phase and aluminates [D].Hangzhou: Department of materials science and engineering, Zhejiang University, 2000: 23-50.

The Lifecycle Growth Trend and Demand Prediction of China Copper Industry Cheng Ma1,a,Weixuan Fang2,b 1Department of Land Resources Engineering, Kunming University of Science and Technology,Kunming,China 2Sino - Tech Minerals Exploration Co.
At the beginning of the economic society industrialization, the demand for raw material and energy is increased rapidly and stimulates the fast growth of consumption intensity of mineral products.
Both non-ferrous metal industry and steel industry belong to raw material industry.
Modern enterprise product life-cycle curve prediction model and its application, Journal of Zhengzhou University, vol. 1 (1999), p. 43-49
China's important mineral resource demand forecasting, Journal of the earth, vol. 6(2002), p. 483-490.

Hydrological Science Journal 27, 4, 1982. 5.
Brownlie, K.A. (1967): Statistical Theory and Methodology in Science and Engineering 2 nd Edition, John Wiley and Sons, New York. 9.
Karim, F. (1998): Bed Material Discharge Prediction for Non Uniform Bed Sediments.
ASCE Journal of Hydr.
ASCE Journal of Hydraulic Div.

The chosen values of the Young’s modulus for the different materials are taken from reference [16], section II, Part D.
For relatively small plastic strains the assumed tangent modulus will be likely to underestimate the real stress levels in both materials.
[6] Smallman and Ngan, Physical metallurgy and advanced materials, 7td ed., Butterworth-Heinemann, 2007, p.323
[8] Fukuoka, Nomura and Nishikawa, Journal of pressure Technology, 2012, vol 134, p. 021202-1 to 021202-6
[12] Moverare J., Oden M, Deformation behaviour of a prestained duplex stainless steel, Material science and engineering: A, 337,( 2002),1-2, 25-38

First is the material of the paper, which adopts the material that specially used for producing money.
The main raw material is cotton linter which is much more precious than ordinary paper-making material.
However, under natural light, the golden yellow spot at the same position will not be seen, which means that the pattern is printed by at least two different kinds of colorless fluorescent materials.
References [1] Liao Xianbo,Research on Raman Spectrum of Genuine and Fake CNY100.00 Banknotes,South China Normal University, Chinese Journal of Lasers
[5]Jiang Yanfei,Picture Processing of Clearing System of Photoelectric Banknote,University of Electronic Science and Technology of China, 2006.

However, the yield strength of EMC is a little change with the increase of temperature which is ranging from 20℃ to 160℃. 1.Introduction Epoxy molding compound (EMC), one of the largest three kinds of raw materials in semiconductor industry, performs the significant functions on the capabilities of discrete and IC [1].
Three equations are required to calculate the true flow stress-true strain relationship of a test material from the experimental strain data [3]
The material constants in ZWT model were determined from experiments.
Acknowledgments This project was sponsored by the National Natural Science Foundation of People's Republic of China (10672113; 10772131), the Special PH.D Research Fund for Universities (20050112009), the Natural Science Foundation of Shanxi Province (2007011010) and the study abroad information of Shanxi Scholarship Council of China. (2008.30) References [1] Xie Zhao-wen.
International Journal of Impact Engineering 35 (2008) 895-904.

Uniformity of Nanofiber Alignment by Electrospinning Yi-Jun Pan1, a, Chien-Kuo Yen 1,b, Feng-Wei Cheng 2,c, Wen-Hao Hsing3,d, Wei-Sheng Chuang3,e 1 Dept. of Materials & Textiles, Oriental Institute of Technology, New Taipei City, Taiwan 2 Graduate Institute of Materials Science and Nanotechnology, Chinese Culture University, Taipei, Taiwa 3 Dept. of Textile Engineering, Chinese Culture University, Taipei, Taiwan afc003@mail.oit.edu.tw, b fc001@mail.oit.edu.tw, cd84044729@gmail.com, hsing@staff.pccu.edu.tw Keywords: Electrospinning, Nanofiber alignment, Parallel electrode, FIJI Abstract.
Given the non-conducting properties of PAN, this experiment uses PAN as its raw material.
Chronakis: Polymer nanofibers assembled by electrospinning, Colloid and Interface Science 8 (2003) 64–75 [2] D.
Chronakis: Novel nanocomposites and nanoceramics based on polymer nanofibers using electrospinning process—A review, Journal of Materials Processing Technology 167 (2005) 283
Chronakis: Polymer nanofibers assembled by electrospinning, Colloid and Interface Science, 8 (2003) 64–75 [6] Z.M.

Relationship Between Interfacial Shear Strength and Interfacial Tension of Silicone/quartz Glass Fiber Composites Chunping Hu1,2,a, Bo Jiang1,b, Baoli Shi2,c, Bing Wang2,d, Li Liu1,e and Yudong Huang1,f * 1Department of Polymer Science and Technology, School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, P.R.
China 2College of Science, Northeast Forestry University, Harbin, 150040, P.R.
Surface tension components (STC) theory is a semi-empirical theory describing the molecular forces in the surface of condensed materials [5].It was proposed by Fowkes and developed by Van Oss, Chaudhury, and Good (VOCG) in the 1980s.
Experimental Materials.
David: Journal of Science of Advanced Materials and Process Engineering Vol. 37 (2001), p. 53–69