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The Growth Charactersitics Study of Introduction Fast-growing Poplar at the Initial Stage of Afforestation Peiyong Lian1, a, Jinye Liu1, b, Liankuan Wang2, c 1Daxing’anling Academy of Forestry Science of Inner Mongolia, Yakeshi, PR China, 022150 2 Dayangshu Forestry Bureau of Inner Mongolia Dayangshu, PR China, 165456 akeyansuolpy@163.com, bye0607@163.com, cdyslyjwlk@163.com Keywords: Fast-growing poplar, Introduction, The initial stage of afforestation, Growth characteristics Abstract.
In poplar cultivation process, stand density is one of the important factors that affect the growth of trees; its size is directly related to the forest stand growth, yield and quality, there are varying difference degrees of wood quality and fiber yield in different density level, directly affects the forest industrial raw material utilization value.
Zhang: Journal of Northeast Forestry University.
Vol.25 (5) (1997), p.53-56(in Chinese) [6] W.S.Cao, S.M.Zhao, S.R.Jiao: Protection Forest Science and Technology.

Material and methods Mice Use SPF healthy males wildtype BDF1 mice(WT) and body HO-1 genetically modified mice(GM) ,the average weight is 18.9 + 1.5 g.
References [1] Feng Chang,Yan Long Li,De Ming Chen,et al.The influence research on skeletal muscle HO-1mRNA expression and serum CK, BUN of different exercise in mice.Journal of Nanjing institute of Physical Education (natural science edition).2012,11(1):14-17
Heme oxygenase system and oxidative stress.Foreign medical·physiological,pathological science and clinical pathol,2002,22(4):371-373

Figure 2 The elements and nodes of section W400 The M-C model is selected as the constructive model of computational material.
Acknowledgements This work was financially supported by National Key Basic Research Development Plan (2012CB026104), and the National Natural Science Foundation of China (51174261, 51078111).
Dynamic Analysis of Large-scale Toppling Deformation Slope and the Problem of Trends Prediction, Coal Science and Technology, Vol. 25, (1997), p38-40
Ling, The Study on the Underground Deformation under the Effect of Excavation Opencast Coal Mine, Journal of Northeastern University, Vol.33(s2), 2012, p226-230

CI belongs to knowledge-intensive industry, and one of the key differences between the knowledge-intensive industry and traditional industry is the use of resources mainly focusing on human resources, rather than the traditional material resources, financial resources, which will lead to knowledge-intensive industry needing in the region of the abundant human resources in order to have a more lasting development.
[7] Alan·Scott, 2004, Culture Industry: The geographical distribution and creative fields[M], Beijing: Social Science Document Publishing House, 121~133 [8] Molotch H.
[12] Saskin Sassen, Zhou Zhenhua(Translator), 2005, Global Cities——New York London, Tokyo, Shanghai[M], Shanghai; Shanghai Social Science Publishing House
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Materials and Methods Research Objects.
Gulemova, Bioplastics as Replacement of Standard Polymer materials, in Materials and methods of innovative scientific and practical research and development.
Popov, Biodegradable Composite Polymer Materials, in Biotechnology: State and prospects of development materials of the IX international congress, Moscow, Russia, 2017, pp. 50-51
Willett, Mechanical Properties of LDPE/Granular Starch Composites, Journal of Applied Polymer Science. 54(11) (1994) 1685-1695. https://doi.org/10.1002/app.1994.070541112 [10] S.
Sokolov., Recycling and Recycling of Polymer Materials, Publishing house Tamb. gos. tech., Tambov, 2005

Materials and Methods Elemental copper powder (particle size: 200 microns), ternary Ti3AlC2 (particle size: 350 microns) and graphene (particle size: 5-10 microns) were used as the starting material and a compositional ratio of Cu-10 vol% Ti3AlC2-0.3 wt% Gr was taken.
Hardened Stainless steel discs (Material: EN-31 Steel with hardness of 60HRC) were used and the cylindrical samples were used as pins.
Archakov, Synthesis, structure and mechanical properties of bulk “copper-graphene” composites, Reviews on Advanced Materials Science, 57(2018), pp 151-157
[8] Jian Wang, Li-na Guo, Wan-ming Lin, Jin Chen, Shuai Zhang, Shao-da Chen, Tian-tian Zhen, Yu-yang Zhang, The effects of graphene content on the corrosion resistance, and electrical, thermal and mechanical properties of graphene/ copper composites, New Carbon Materials, (34)2019, pp161-169
[12] Huang Xiao Chen, Feng Yi, Qian Gang, Zhao Hao, Song Zhao Kun, Zhang Jing Cheng, Zhang Xue Bin, Arc corrosion behavior of Cu-Ti3AlC2 composites in air atmosphere, Science China Technological Sciences, 61(2018), pp551–557

Because Hertz contact area of contact vice material low damping characteristics, and it’s damping negligible; Export area oil film air-pocket form of negative pressure characteristics of contact less effect, can be neglected [7].
[3] WANG Yan, JIA Chang-zhi, HAN Xiao-ping,et al.Virtual prototyping and simulation on multi rotor-bear-ing system [J].Journal of Ordnance Engineering Col-lege, 2007,19(3):50-53
[4] YAO Ting-qiang, CHI Yi-lin, HUANG Ya-yu,et al.Contact dynamics simulation of rigid and flexible cou-pled spindle system [J].Mechanical Science and Tech-nology for Aerospace Engineering,2007,26(11):1507-1510
Gear system dynamic vibration and impact, noise [M].Beijing: Science Press, 1996

Table 1 Structure size and material parameters of pavement Structural layer Elastic modulus E/MPa Poisson ratioμ Coefficient of thermal conductivity /w/m℃ Temperature contraction coefficient /1/℃ Asphalt overlay 1200（800-2400） 0.25 1.2 2.1×10-5 Stress absorption interlayer 800（400-1600） 0.25 1.2 2.1×10-5 Old cement concrete slab 30000 0.15 1.5 1.0×10-5 base 100 0.3 1.0 0.5×10-5 The Determination of the Most Unfavorable Load Position Fig.3 shows the change law of stress intensity factor K and J-integral of crack tip when it is under different wheel load.
The Key Project of Guangxi Science and Technology Lab Center(LGZX201107).
[M].Beijing: Science Press, 2009, 22-58
Analytical prediction of short to long fatigue crack growth rate using small-and large-scale yielding fracture mechanics.International Journal of Fatigue, Volume 25, Issues 9-11, September-November 2003, Pages 923-933.

A Novel Design in Micro-Air-Vehicle: Flapping Rotary Wings WU Jianghaoa,ZHOU Chaob and ZHANG Yanlaic School of Transportation Science and Engineering, Beihang University, Beijing, PR China a buaawjh@buaa.edu.cn, b zcqh821@163.com, c zhangyanlai@buaa.edu.cn Keywords: MAV; flapping rotary wings; lift force; aircraft design Abstract.
To lessen the model’s weight, the shaft and sleeve all use carbon fiber material.
Acknowledgements This research was primarily supported by the National Natural Science Foundation of China (10902009 and 11172029).
International Journal of Micro Air Vehicles, Volume 1, Number 4, pp. 255 - 262

The material of structures is steel, which is modeled by DAMTEP and YLDVM.
The stiffening should be thicker than outer bottom and thinner than inner bottom Acknowledgements This work was financially supported by the China Postdoctoral Science Foundation (20100471794).
Ship Science and Technology. 29(1) (2007) 91-94
Journal of Harbin Engineering University. 29(4) 2008. 326-331