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That has caused much inconvenience to many people who use electric bicycles, and it is also a waste of raw materials and energy [1][2].
The chargers of fine performance are good for saving energy and raw materials, and it’s of great significance in promoting positive and healthy development of the battery industry.
Acknowledgments This work has been supported partly by Natural Science Foundation of Weifang University (2008K17) and Shandong Provincial Natural Science Foundation (Z2007F08).
Journal of Beijing Polytechnic Wniversity.2000,26(2):59-63

Experimental Materials and methods Experimental Materials.
Henan Science and Technology. 200, 6: 31-32 [4] Xianping Luo, Minghui Xie, Yangkun.
Jiangsu Environmental Science and Technology .2006,2 (19) :14-16.
Journal of East China Jiaotong University. 2008, 25 (6): 6-10

China, 030003 3 Division of Structure Materials, Central Iron & Steel Research Institute, Xue Yuan Nan Lu 76, Beijing, P.
Materials Science and Engineering, A271(1999),14-21 ,[] L.
Metal Science, 8(1977),208 ,[] J.
Journal of Iron and Steel Research, International, 14(2007), Supplement 1, 335-338 ].

Introduction With the rapid development of modern science and technology, the pressure leak detection technology has been widely used in various fields, including aerospace, aviation, refrigeration, automotive industry, etc[1, 2].
American Society for Testing and Materials had researched the standard pressure leak [7].
J.Vac.Sci.Technol, 1996,A14(3):1247-1251 [7] American Society for Testing and Materials.
Chinese journal of vacuum science and technology. 2004,24(6).439-441 [10] Chen Xu, Zhang Qiliang, Liu Qingmin，the development of pressure leak calibration device. the 10th mass spectrum analysis and leak detection in China,2003:28-33

Study on the Isolation and Purification of Proanthocyanidins from Rhodiola rose by Macroporous Adsorbent Resin Wen Zhao1,a , Yucai Meng1,2,b, Zhiping Yin1,c, Weihua Liu1 and Cuijiao Niu1 1Department of Food Science and Technology, Agricultural University of Hebei, Baoding, Hebei, 071000, China 2 Disease Control Center of Renxian, Xintai, Hebei 055150, China azwgyf@yahoo.com.cn ，b mengyucaiaaa@126.com, cliulang2886367@163.com Keywords: Rhodiola rose; Proanthocyanidins; Macroporous resin Abstract: Five different macroreticular resins (S-8, HPD750, AB-8, HPD100 and D101) were evaluated for the adsorption properties of the proanthocyanidins extracted from Rhodiola rose.
Experimental Materials and chemicals.
Food Science, Vol. 23(2002), p108-110
Journal of Hazardous Materials, Vol. 137(2006), p157-164.

Fig. 1 Dimension of the grooved edger roll Fig. 2 Longitudinal crack size The rigid material model is used for rolls whose elastic deformations are neglected.
The bilinear isotropic hardening material model is adopted for the slab.
The main material parameters and rolling conditions are shown in Table 1. 5 50 Slab side surface Slab top surface 340 240 160 R50 R20 0.5 2.2 FE models Table1 Material parameters and rolling conditions Parameter Value Young's modulus, GPa 210 Poisson's ratio 0.3 Rolls Density, kg.m -3 7 850 Young's modulus, GPa 117 Poisson's ratio 0.3 Slab Density, kg.m -3 7 850 Draft in vertical rolling, mm 50 Draft in horizontal rolling, mm 10 Friction coefficient 0.35 Rolling conditions Rolling speed, m.s -1 4 Owing to the symmetry distribution of the rolls and the slab, a quarter of rolling parts is employed in simulation.
Acknowledgement This work was supported by the National Natural Science Foundation of China(No.50534020).
Li: Journal of Northeastern University (Nature science), Vol.26 (2005), p. 982

China 2Chendu Institute of Organic Chemistry, Chinese Academy of Science, P.R.
Metal-organic frameworks (MOFs) are a new class of crystalline microporous materials.
Acknowledgements This work was financially supported by the Key Projects in the National Science & Technology Pillar Program during the Twelfth Five-Year Plan Period (20116BAZ03281) and the Key Research Program of Qujing Normal University (2011ZD004), China.
Polymeric Materials Encyclopedia (ed.
Qiu: Chemical Journal of Chinese Universities Vol. 25 (2004), p.1016

The Research of Rockburst Hazards of Linglong Gold Mine Base on The Relationship of Impact Energy and Confining Pressure Zijian Zhang1,a, Hongguang Ji1 , Weibin Wu1,b, Yuezheng Zhang1, Shanbo Jiang2.c 1 School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2Shandong Gold Group CO.
Strength criterion contains vertical stress ratio （ the ratio of vertical stress on the plane to the uniaxial compression strength of the material）[5]maximum principal stress（the ratio of maximum principal stress on the plane to the uniaxial compression strength of the material） maximum shear stress (the ratio of maximum shear stress on the plane to the uniaxial compression strength of the material).
The rock burst happens in changing stress state field, so the rock burst should not be a static material parameter, it should be related with stress state.
Chinese Journal of Geotechnical Engineering.
Engineering Science.J.Vol.2002 (7): pp.51-55.

The uncertainty of the supply process is mainly related to the supply of raw materials, transportation process, production process, such as suppliers of raw materials at the out of stock or of substandard quality, the opportunistic behavior of suppliers for their own interests, breach of contract, during transportation delays, machinery and equipment failure led to the interruption of the production process, these uncertainties will cause unable to meet customer demand, market share fell even lose market due to product obsolescence, thus causing huge losses to the supply chain enterprises.
evolution of complex systems and complexity science,2008 (3 ): 34-37
Journal of Chongqing Normal University, 2005,22 (4 ): 1-5
Management Science, 2000, 46 ( 3 ): 436 - 443.

Materials and Methods Materials Kerosene is chosen as continuous phase of dispersion which is purchased from Shenyang Reagent Factory in China.
Acknowledgment The work was supported by Ministry of Education (210047), the Educational office of Liaoning Province in China (2008499), and China Postdoctoral Science Foundation (20090451262).
References [1] X L Wang, GJ Chen and LY Yang, “Study on the recovery of hydrogen from refinery (hydrogen plus methane) gas mixtures using hydrate technology”, Science in China series B-Chemistry, vol.51, pp.171-178, February 2008
[2] A.Fouda, Y Chen and J Bai, “Wheatstone bridge model for the laminated poly- dimethylsiloxane polyethersulfone membrane for gas separation”, Journal of Membrane Seienee, vol.64, pp.263-271, February 1991