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Soil improvement of Pinus yunnanensis forest at different age in Central Yunnan Plateau Jinxia Wu1, a, Yanxia Wang1, b , Qibo Chen1, c and Zhilong Tong 1, d 1 Department of Environmental Science＆Engineering，Southwest Forestry University，Yunnan，China awjx19880819@163.com, b65653584@qq.com, cchengqb@swfu.edu.cn, d289694710@qq.com Keywords: forest age, Pinus yunnanensis, soil physical and chemical properties Abstract: Took the Pinus yunnanensis forest as the research object, and took planted forest for control, carried on a research in soil physicochemical properties of different forest ages of Pinus yunnanensis.
Introduction Vegetation and soil are important parts of ecological system, soil is the material basis in the occurrence and development of plant community.
References [1] Junyan Zhang, Yuanchang Lu, Kewu Cheng, Kaipeng Zhong and Yongxiang Huang: Journal Publishing Department of Agricultural University of Hebei, 72-77(2010), in chinese

Some factors such as stress-strain relation of nonlinear material, crack of concrete, tension strengthen, load and time history and nonlinear temperature grads are considered in the program.
[3] Wang Tiemeng, Crack Control of Building, Science and Technology Publishing House of ShangHai, 1987
[4] Hsuan-The Hu and William C.schnobrich, Nonlinear Analysis of Crack Reinforced Concrete [J], ACI Structural Journal / March-April , 1990.

It is a normal distribution, which is used to describe the pressure of the bulk material.
Eshra Numerical simulation of buffeting longitudinal wind forces on buildings, Alexandria Engineering Journal (2018). https://doi.org/10.1016/j.aej.2018.08.001 [9] DBN В.1.2-2:2006.
Rootzen, Springer Science & Business Media, 2012.

The geometric properties of the model, loads and material properties of sections are shown in Fig. 1.
Acknowledgment This work received financial support from Ministry of Science, Technology and Innovation of Malaysia under Research Project No. 5450366 and supported by Institute of Advance Technology of Universiti Putra Malaysia and gratefully acknowledged.
Soda, Journal of Wind Engineering and Industrial Aerodynamics Vol. 59 (1996) p. 247 [7] S.

Research on Identification Model of Stator Core Temperature Rise of a Generator Dong Xiang1, Hao Xiong1,2, a , Ningbo Liu1, Qiang Wu1 and Guangwei Meng1 1 Naval University of Engineering, Wuhan, 430033, China 2 Huazhong University of Science and Technology, Wuhan, 430074, China ahowell76@sina.com Keywords: Stator core, Temperature rise model, System identification, Generator.
In Fig. 4, the heat capacity is the product of the mass concentrated in the node and the mass specific heat of its material, and the copper loss of the stator windings is not a constant heat source but a dependent heat source controlled by the temperature.
Seetharamu: International Journal of Numerical Methods for Heat and Fluid Flow Vol. 9 (1999), p. 18-38

The material of steel plate is Q235, whose parameters are that Elastic modulus E=2.0e11Pa, Poisson ratio=0.266 and Density.
Jiangsu Phoenix Science Press, 1988, pp.219-223 [3] W.W.
Shen, Fuxiang Guo and Deguang Fang: Journal of Vibration and Shock, Vol.29 (10)(2010), p.244

Detection of infrared Changes: The pyroelectric material detects infrared radiation pattern variations when a heated object moves within the sensor’s field of view, generating an electrical signal in response due to its sensitivity. 1.3.
In 2016 International Conference on Emerging Trends in Engineering, Technology and Science (ICETETS) (pp. 1-6).
Turkish Online Journal of Qualitative Inquiry, 12(3)

Research on the migration of children’s experience from the virtual world to the real world Jinyan Hu1 , Hongyu Feng1, Jianheng Lu2 ,Yuanyuan Li2,b, Yancui Li1,Lili Zhang1,a 1College of Information Engineering, Henan Institute of Science and Technology Xinxiang Henan, China,453003 2No.2 Senior Middle School of PingdingshanPingdingshan Henan, China,467092 a hujinyan07@163.com, b iamlyy@126.com Key words: virtual world, real world, migration Abstract.
The objects in virtual world are no more than the “electronic” material in the real world, but the extension and expansion of the real world by using new technologies.
Journal of Huaiyin Teachers College, 2005, (3): p360(2005) [4] Xiaodong Xu.

With the development of modern science, new technologies have been widely used.
Due to high temperature alteration ratio, sealing material must be have the high thermal conductivity and heat resistance [3].
[7] Li Xiubao, Xu Rangshu: Journal of Shenyang Institute of Aeronautical Engineering, Vol. 26 (2009) No. 1, p.20-22.

The ship concealment is enhanced, and the ship survivability is advanced. 2 Ship Electric Field Generating Energy Source Analysis 2.1 Energy source analysis Most modern ships are made of different metallic material.
Journal of naval university of engineering, 2008, 20(2): 1-4
China National Defense Science and Technology Report. 2011.11