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Materials and equipment A total of 129 pieces of 32×120×3900mm Larix gmelinii form IKEA Wood in Mohe County, Hei Longjiang province, which contain the diameter class of 22cm and 26cm.
Larch timber is used as structural material which often bears side pressure, and there is some relation between side flexural and other strength.
Wood Science, 1979, 12(2):73-79
Size Effect of Length on Tensile Strength of Visually-Graded Chinese Fir Dimension Lumber [J] Journal of building materials 2010, 13(5):646-649.
ASTM D4761-05 Standard test methods for mechanical properties of lumber and wood-base structural material [S].

Removal of chemical oxygen demand in tannery effluent by flocculant Qinhuan Yang 1, Changqing Zhao 2 1 College of Material and Chemical Engineering, Sichuan University of Science and Engineering, Zigong 643000, China 2 College of Bioengineering, Sichuan University of Science and Engineering, Zigong 643000, China Key words: tannery effluent; chemical oxygen demand; flocculant Abstract.
Acknowledgements This work was financially supported by the Key Project of Chinese Ministry of Education (Item No. 211161), the Startup Project of Scientific Research for Sichuan University of Science & Engineering (Item No. 2011RC09) and the Self-financing Project for the Department of Education of Sichuan Province in 2012 (Item name: Exploitation of key technology for treatment of ammonia-nitrogen and chroma in tannery wastewater).
Teng, et al.: Advanced Materials Research, Vol. 424-425(2012), p. 824-827
Wang, et al.: Journal of Sichuan University (Engineering Science Edition, Vol. 40(2008), p. 94-98.

Last, make sure the shell can be made and installed, and as much as possible to save material. 
The design requirement of rack Rack rails are multi-stage installation and its material is wear-resistant material to ensure the smooth operation of machine head on the rail.
Hunan Agricultural Sciences, 2011,23: 32-35
Journal of Hebei Agricultural Sciences, 2009,13(5): 148-149
Chinese Tobacco Science, 2010,31(5): 72-75

In conclusion, the adhesion phenomenon is interpreted via hydrophobic contact angles showing that hydrophobic contact angle of Ni-P-PTFE surfaces is smaller when compared to Ni-P surfaces which infers the anti-adhesion properties of Ni-P-PTFE materials.
It is well known that micro impacts are expected to occur during ultra-precision machining of amorphous materials because imperfections in the material structure.
Therefore, machining of electroless Ni-P material with less phosphorus content will lead to higher abrasive wear.
Acknowledgments: The authors would like to thank the National Science Council in Taiwan, ROC for the financial support during the research period under the Project No.
Meada, Cutting performance of diamond tools during ultra-precision turning of electroless nickel plated die materials, Journal of Materials Processing Technology, 140 (2003) 308-313

American has designed and produced high density fuels with adamantane as raw materials.
References [1] Yan Jiao, Lili Feng, Yuelin Zhu, Changjian Xiong: Review of American military jet fuels development [J], JOURNAL OF ROCKET PROPUSI0N, 2008,1, p. 30, In Chinese
[2] Jijun Zou, Xiangwen Zhang, Li Wang, Zhentao Mi: Progress on the Synthesis and Application of High-density Liquid Hydrocarbon Fuels, Chinese Journal of Energetic Materials, 2007, 4, p. 411, In Chinese
[4] Yinchao Ju, Guoqiang Xu: Effects of pressure on the coking characteristic of jet fuel RP-3 [J], Journal of Beijing University of Aeronautics and Astronautics, 2010, 3, p. 257, In Chinese
[6] Yan Xue, Shulei Wang, Jie Liu: Development Trend of Aviation Fuel in the Future Space Age, The Paper Collection of Chinese Chemical Society 5~(th) Academic Conference of Chemical Propellant (2011), p. 51, In Chinese [7] Guangyuan Ren: Military Aviation Power of the 21th Century [J], National Defense Science & Technology, 2007, 7, p. 32-35, In Chinese [8] Jie Liu, Wenjie Cao, Yan Xue, Shulei Wang, Zechen He: Development Trends of Coal-Based Jet Fuels, Chemical Propellants & Polymeric Materials, 2008, 2, p. 24, In Chinese.

Introduction Nitride semiconductor materials are widely used in display, data storage, high frequency and high-power devices, ultraviolet photodetectors, and other related devices due to their excellent characteristics.
The poor quality and lack large size of gallium nitride (GaN) single crystal substrate materials has made technologies widely using sapphire and SiC as substrate for hetero-epitaxial GaN materials.
Silicon (Si) substrate has some excellent characteristics: cheap, good heat and electrical conductivity, low hardness, made out of large high-quality single crystal materials, and easy to process due to a mature processing device technology.
Furthermore, Si used as substrates may achieve optoelectronic integration of silica-based material, causing Si to become one of the most attractive substrate materials for GaN epitaxy [1-3].
Interference microscope (Olympus BX51) and AFM (Chinese Academy of Sciences Chemistry Division CSPM3100) were used to analyze the macro- and micro-surface appearance.

Laser machines are fast, no contact points with materials and they can be worked without producing crust.
References [1] Sahin A.Z., Ayar T., Yilbas, B.S., Efficiency analysis of laser hole cutting, International Journal of Exergy, (2009), 6:592-604
[3] Ahn D.G., Jung G.W., Influence of process parameters on drilling characteristics of Al 1050 sheet with thickness of 0.2 mm using pulsed Nd:YAG laser. 1st International Symposium on Hybrid Materials and Processing, Busan, South Korea, Oct 27-29, (2009), 19:157-163
[6] Bruneau S., Hermann J., Dumitru G., Sentis M., Axente E., Ultra-fast laser ablation applied to deep-drilling of metals, Applied Surface Science, (2005), 248:299-303
[10] Yilbas B.S., Parametric study to improve laser hole drilling process, Journal of Materials Processing Technology, (1997), 70:264-273.

Materials and Method Materials Mud is taken from Sidoarjo Mud located in Porong District, Sidoarjo Regency, East Java Province at points -7.531453o and 112.70843o.
In Journal of American Science. 2010; 6 (11) [3] Todkar, B.
The Canadian Journal of Chemical Engineering. 2019 [15] G Zadora, Brozek M Z.
Materials Chemistry and Physics 81. 2003; 345 - 348 [16] Sulistiyono Eka, S.
Advanced Materials Research. 2012; 382; 379-383

An algorithm was developed to reconstruct velocity tomographs of the interior of the material.
Tomography has been effectively adopted for various rock-like materials in laboratory.
The small level of anisotropy, 5%, was ignored and the material was treated as isotropic.
Acoustic emission source location and velocity measurements," International Journal of Rock Mechanics and Mining Science & Geomechanics Abstracts, Vol. 32 (1995), p. 741
Hazzard: Imaging and visualization of fractures in rock engineering(Millpress Science Publishers, Rotterdam 2004)

Anhui University of Architecture 2.Anhui Jiachen Science and technology Co., LTD Keywords: red laser positioning,cutting machine,computer,domestic initiative Abstract.This paper introduces the development of red laser positioning computer-aided-signage system.
Digital products have been cutting in overseas markets for their products, design and adopted CCD imaging system, positioning accuracy is susceptible to light, materials, environmental factors, and red laser positioning can adapt to the environment, the positioning precision 0.1 mm.
The traditional technique of cutting tools, and control, cutting process will produce with the noise impact materials, tools work this way, service life greatly will decline.
[3] THE OPTICAL SCANNING TECHNOLOGY IN AN AIRBORNE SCANNING LASER RANGING-IMAGER SENSOR SHU Rong; HU Yihua; XUE YongqiShanghai Institute of Technical Physics; Chinese Academy of Sciences (CAS) Shanghai Senstron Institute of Information Technology 2000 25～(th) International Conference on Infrared and Millimeter Waves Conference Digest [4] Quality control of laser tailor welded blanks Qi Yan* Baoshan Iron and Steel Corporation; Shanghai; China Proceedings of Lasers in Material Processing and Manufacturing III [5] Lanzhangli Yanguo Yangxiaofan Zhoujianting, Based on the dynamic gradient algorithm of laser spot centerComputer Science,2008 Vo1．35N0．8 [6] Zhangjinlong Yulingling Liujingnan, Precision detection and localization technology research.
Chinese Journal of Scientific Instrument , Volume 25, Number 6/2004 [7] Design of an advanced incremental fuzzy logic controller for laser surface heat treatments José Antonio Pérez, José Luis Ocaña, Carlos Molpeceres,The International Journal of Advanced Manufacturing Technology, Volume 36, Numbers 7-8 / 2008 [8] Motion planning for mobile robots using a laser range finder,Jr-Hung Guo, Kuo-Lan Su, Chia-Ju Wu, Sheng-Ven Shiau,Artificial Life and Robotics, Volume 14, Number 2 / 2009 [9] Development of a Unique, High Precision Linear Motor Integrated Air Slide Table, and Its Application to Laser Beam Writers ,Hajime Onda,Optical Review, Volume 6, Number 1 / 1999.1 [10] Highly efficient high-power quasi-continuous diode laser bars for pumping solid-state lasers based on Yb-containing active media ,N.