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A Numerical Simulation of Surface Deformation Due to Ore Drawing Perturbation Hongshuang Li1,a, Jianhua Du2,b and Cuifeng Du3,c 1 School of Civil and Environment Engineering ,University of Science and Technology Beijing, Beijing 100083，P.R.CHINA 2 School of Civil and Environment Engineering ,University of Science and Technology Beijing, Beijing 100083，P.R.CHINA 3 School of Civil and Environment Engineering ,University of Science and Technology Beijing, Beijing 100083，P.R.CHINA a li_hongshuang@126.com, b magicdna@126.com,cducuifeng@126.com Keywords: covering layer；loess；PFC；ore drawing Abstract.
Correctly select the material parameters in PFC2D model is the key to simulate mining process of natural caving.
Reseach on the Mechanism and Controlling Method of the Underground Debris Flow in Jinshandian Iron Mine，Beijing：University of Science and Technology Beijing(2010) [4].
PFC and Application Case of Caving Study，Chinese Journal of Rock Mechanics and Engineering，vol.25, pp.1927-1931(2006) [5].
Wang Lianqing；Gao Qian；Wang Jianguo；Numerical simulation of natural caving method based on particle flow code in two dimensions，Journal of University of Science and Technology Beijing，vol.29, pp.557-561(2007) [6].

The material is much different from homogeneous and continuous soil [1-3], and poses difficulties in situ sample acquisition and laboratory geomaterial tests.
Alternatively, the assembly can be assumed that represents a material of low initial porosity.
Acknowledgements The research work is supported by the china postdoctoral science foundation (20090461003), the natural science foundation of Hubei province (2008CDB052), the science research project of the educational commission of Hubei province (Q20081302) and the director foundation of the key laboratory of geological hazards on three gorges reservoir area of ministry of education (2008ZRJ03).
International Journal of Rock Mechanics and Mining Sciences, 2004, 41 (3): 494-499 [2] Xinhua YOU.
International Journal of Rock Mechanics and Mining Sciences, 2008, 45(5): 749-762 [4] PFC2D (Particle Flow Code in 2 Dimensions).

The regularity of symptoms of “Mesophyll collapse” as well as the difference of metabolic enzymes (Being related to the chilling injury) between healthy fruits and diseased fruits in storage is being analyzed in this paper so as to provide preliminary basis for clearly regulating the relevant metabolic pathway of “Mesophyll collapse”. 2 Materal and Method 2.1 Plant Materials and Sample Preparation.
One activity unit is defined as: Under the measured conditions, 1g fresh weight of test materials causes the absorbance value changes of 0.001 in 1min. 3 Results and discussion 3.1 Symptoms and disease regularity of “Mesophyll collapse” of Lingwu Long Jujube There are no symptoms of disease to Lingwu Long Jujube under the normal temperature conditions, while the symptoms begin to occur in 7~10 days after the low temperature pre-cooling or storage.
Ningxia Journal of Agriculture and Forestry Science, 2002, (3): 33-34
Journal of Shanxi Agricultural Sciences, 2000,28 (3):75-79
Hubei Agricultural Sciences, 2009,48 (2): 338-340.

EPD is a technologically facile and largely scalable technique, which allows for the deposition of materials onto semiconductor wafers whose diameter (several inches) is broadly used by industry.
ACS Applied Materials & Interfaces 3 (2011) 3611-3615
Semiconductor Science and Technology 28 (2013) 045006
Journal of Colloid and Interface Science 215 (1999) 159-166
Journal of the American Ceramic Society 83 (2000) 1399-1401.

Applied Mechanics and Materials(2014), 526 (2014) pp 222-229 [3] A.
Science(2005)., 308(29), pp 639-641 [4] M E J Newman.
Modeling strategic alliances in the wide-body long-range aircraft market, Journal of Air Transport Management(2007), 13(3): 139-148
Journal of Operations Management (2001),19: 351-366
A Network Approach to Define Modularity of Components in Complex Products, Journal of Mechanical Design (2007), 129: 1118

Acknowledgement This study is supported by the Key Self-Service Subject of the Twelfth Five-Year Plan of Educational Science of Jilin Province under the grant No.
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Effects of Cr3+ on COD Changes of SBR Activated Sludge System with Different Chromium Loads and Different Initial SVIs Dong Guori1,2,a , Liu Jianshe2,b 1Department of Environmental Science and Engineering , Northeastern University at Qinhuangdao , Qinhuangdao 066004,　Hebei , China 2School of Resources Processing and Bioengineering , Central South University, Changsha 410083 , Hunan, China a dgrcsu@163.com, b ljscsu@263.net Keywords: chromium, SBR, tolerance range, non-tolerance range, chromium load, initial SVI Abstract.
Materials and Methods Source and Quality of Experimental Water.
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Materials Letters, Vol. 51 (1) (2001), p. 7 [2].
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All kinds of material physical parameters are shown in Table 1.
Table 1 Materials physical parameters Material Elastic modulus (MPa) Density (kN/m3) Poisson's ratio Concrete 3.25×104 24.5 0.167 Granite body 3.0×104 25.0 0.3 Backfill stone 1.2×104 18.0 0.27 Figure 1 The calculation model of whole wharf Figure 2 The calculation model of slab High Pile Wharf Slab Dynamic Calculation Calculation Groups.
Acknowledgements This work was financially supported by the National Natural Science Foundation of China (Grant No. 40776053) and the Fundamental Research Funds for the Central Universities (Grant No. 2010B02714).
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