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Faculty

Guilin Piao Professor

Academic Area: 
Energy and Environment System Engineering
Research Interests: 
Gasification of coal with high ash fusion temperature; Co-gasification of coal and biomass; Simultaneous removal of SO2 and NOx in flue gas with activated coke; Preparation of carbon nanotube from bio-gas; H2S removel with activated carbon
Bio: 

Educational Background

  • PhD, School of internal combustion engine, Inner Mongolia University of Technology (2000)
  • MA, Chemical Engineering Degrees, Graduate School of Engineering Nagoya University(1997)
  • BA, School of internal combustion engine, Inner Mongolia University of Technology (1984)

Employment Record

  • 1984.8-1994.9 Harbin Power Plant System Design and Research Institute, The Ministry of machinery industry, P.R. China
  • 2000.4-2004.9, Japan Science and Technology Corporation, The Ministry of science and technology, Post-doctoral research fellow
  • 2004.10-2006.3 Nagoya Industrial Revitalization Corporation, Senior research fellow
  • 2006.4-2007.6 Engineering Department, Nagoya University, Research fellow
  • 2007.6-2009.9 School of Energy & Environment Engineering, Southeast University, Professor
  • 2009.10-- School of energy and mechanical engineering, Nanjing Normal University, Professor (Distinguished Professor)
  • 2003.6- Xi'an University of Architecture and Technology, Visiting professor
  • 2005.7- Shanghai University of Technology, Visiting professor
  • 2009.8- Biosphere Science Center in northern region, Hokkaido University, Visiting researcher
  • 2014.10-Plasma Research Center, Nagoya University, Visiting professor
  • 2014.10-2015.4 Gifu University, Visiting professor

Research
Research  Projects

  • Numerical Simulation of Coal Gasification with Advanced Fluidized Bed
  • Development of Urban Waste RDF Combustion technologies in the Fluidized Bed
  • Research on the Development of High Temperature Entrained Flow Gasification of Organic Waste for Fuel Cell Power Generation (Development of Key Technology in Constructing Circular Environment of Urban, 2005 Aichi World Expo Designated Project)
  • Development of Biomass Liquefaction Technology (Economic Industry Province Central Bureau of Economy)
  • Development of Biomass Entrained Flow Gasification in Air (NEDO Japanese Institutions and Development of New Energy Project)
  • Development of Biomass Combustion Stirling Power Generation Technology (NEDO Japanese Institutions and Development of New Energy Project).
  • Exploratory Research on High Ash Melting Point Coal with Dry Slag in Entrained Flow Gasification Bed. (NEDO Japanese Institutions and Development of New Energy Project)
  • Development of Combustion of Low Volatile Coal process (by National Project)
  • Experimental Research on Heat and Mass Transfer Characteristics of Air Pipes in Fluidized Bed (Sub-project of National Major Issue PFBC Power Generation Technology and Equipment, Project Leader)
  • Development of 410T/h(100MW)for the Burner of Natural Gas Boiler (Ministry of machine building project, Project Leader)
  • Development of 300MW and 600MW Combustion Boiler Technology (Major National Issue, Imported Technology of 300MW and 600MW Subcritical Large Capacity Power Generation Equipment Digestion, Project Leader)
  • Development of Gas-Solid Mixed Phase Flow and Separation Technology in Powder Carbon Supply System. (Major National Issue, Imported Technology of 300MW and 600MW Subcritical Large Capacity Power Generation Equipment Digestion, Project Leader)
  • Experimental Study on Shade Separation of Coal Pulverizing System-Distributor. (Major National Issue, Imported Technology of 300MW and 600MW Subcritical Large Capacity Power Generation Equipment Digestion, Project Leader)
  • Investigation Study on Large Capacity Domestic and the Introduction of Power Generation Technology (Original Electric Power Industry, Large-Scale Joint Investigation Project)
  • Research on combustion of Low Inferior Lignite Coal in Fluidized Bed. (Project Leader)
  • Development of Co-Gasification of Coal and Biomass Process. (Natural Science Foundation Project in Jiangsu, China , 2012-2015)

Journal Articles

  1. Pang Li-jun, Yuan Gen-jian, Piao Gui-lin. Experimental study on heat transfer of air tube immersed in fluidized bed [J]. Energy Conservation Technology, 1987, 4: 16-18.
  2. Piao Gui-lin. Fluidized bed boiler water circulation system and combustion chamber structure transformation [J]. Energy Conservation Technology, 1991, 6: 33-34.
  3. Cheng Qing-gang, Piao Gui-lin. To improve the output of coal mill pulverizing system and economic problems of the steel ball [J]. Power System Engineering, 1992, 8(3): 16-22.
  4. Piao Gui-lin. 300t/h (MSFB) a variety of bed material of circulating fluidized bed boiler[J]. Power System Engineering, 1992, 8(2): 21-27.
  5. Piao Gui-lin, CHENG Qing-gang, JIANG Jian-qiang, et al. Model tests of pulverized coal concentrator [J]. Power System Engineering, 1993, 9(2): 53-56.
  6. Piao G L, Yamazaki R, Mori S, et al. Simulation modeling of fluidized bed coal gasifier for new topping cycle system[C]. 14th International Conference on Fluidized Bed Combustion, Canada, 1997(14):579-583.
  7. Piao G L, Yamazaki R, Mori S, et al. Simulation modeling of fluidized bed coal gasifier for new topping cycle system[J]. KAGAKU KOGAKU RONBUNSHU, 1998, 24(1): 42-45.
  8. Piao G, Aono S, Mori S, et al. Combustion of refuse derived fuel in a fluidized bed[J]. Waste Management, 1998, 18(6): 509-512.
  9. Piao G, Aono S, Mori S, et al. Combustion of refuse derived fuel in a fluidized bed[C]. International Conference on Incineration and Thermal Technologies, Solt Lake City, U.S.A., 1998(17):301-304.
  10. Piao G, Aono S, Kondoh M, et al. Combustion of refuse derived fuel in a fluidized bed[C]. The 2nd International Symposium on Advanced Energy Conversion Systems and Related Technologies, Nagoya, Japan, 1998(2):118-119.
  11. Piao G. Combustion Characteristic of RDF in Fluidized-bed[J]. Chemical Engineering Papers, 1999, 25(4): 624-628.
  12. Piao G, Aono S, Yamazaki R, et al. Combustion test of refuse derived fuel in fluidized bed[C]. International Conference on Incineration and Thermal Technologies, Orlando, U.S.A., 1999(18):49-52.
  13. Piao G, Kondo M, Yamaguchi M, et al. The behavior of chlorine compound with combustion of RDF in a fluidized bed[C]. The Asian Symposium on Multiphase Flow, Osaka, Japan, 1999:83-88.
  14. Piao G, Aono S, Kondoh M, et al. Combustion test of refuse derived fuel in a fluidized bed[J]. Waste Management, 2000, 20(5): 443-447.
  15. Piao G L, et al. The Behavior of Chlorine in RDF combustion in a bubbling Fluidized-bed Incinerator [J]. Chemical Engineering Papers, 2000, 26(4): 551-556.
  16. Piao G L, et al. Desorption Characteristics of Hydrochloric Acid in Combustion of RDF in Fluidized-bed Reactor [J]. Chemical Engineering Papers, 2000, 26(4): 609-613.
  17. Piao G L, Kondo M, Hamai M, et al. Gasification of organic waste materials (OWM) for generation using fuel cell[C]. 6th World Congress of Chemical Engineering, Melbourne 2001(6):23-27.
  18. Piao G L, et al. Research and Development of High Temperature Gas Conversion Technology of Organic Waste in Spouted Bed[J]. Journal of Japanese Society of energy, 2003, 82(9): 671-678.
  19. Piao G, Kondo M, Hamai M, et al. Gasification behavior of woody biomass entrained in down-flow furnace with auxiliary fuel burner[C]. 22nd International Conference on Incineration and Thermal Treatment Technologies 2003 (IT3-2003), May 12-16, Orlando, Florida, U.S.A. (2003).
  20. Piao G, Hamai M, Kondo M, et al. Research and Development on Gasification Technology of Organic Waste Material (OWM) by Using Entrained-Flow[C]. Proceedings of the Asia-Pacific Conference on Sustainable Energy and Environmental Technologies, (Macro Review Special Issue, The review of Japan Macro-Engineers Society, 2003, 16(1): 67-72), May 8-10, Yokkaichi, Mie, Japan, 2003.
  21. Piao G, Hamai M, Kondo M, et al. Research and development on gasification technology of organic waste material (OWM) by using entrained-flow [J]. JOURNAL-JAPAN INSTITUTE OF ENERGY, 2003, 82(9): 671-678.
  22. Piao G, Kondo M, Hamai M, et al. Research and development on gasification technology of organic waste material (OWM) by using entrained-flow [C]. Eighth China Japan Symposium on Fluidization, Gifu, Japan, 2003(8):219-226.
  23. Piao G L, et al. New Technology of Using Waste [J], Chemical Engineering of Japan, 2003, 37(5):262-264.
  24. Mori S, Kobyashi N, Itaya Y, Piao G, Kondo M, Hamai M, Yamaguchi M. Research and Development on Gasification Technology of Organic Waste Material (OWM) by Using Entrained-Flow[C], Proceeding of 2003 AIChE Annual meeting, San Francisco, USA (2003).
  25. Piao G L, et al. Research and development of High Temperature Gas Conversion Lignocellulosic Biomass of a Fuel Cell Power Generation Process. [J]. Chemical Engineering Papers, 2004, 30(4): 385-390.
  26. Piao G L, et al. Research and Development of High Temperature Gas Conversion Process of Waste Power Generation Fuel Cell[C]. Development of Fundamental Technology for the City as a Study of the "Environment-friendly Project Research Report of Aichi Prefecture, Nagoya regional 2004.
  27. Piao G L, et al. Research and Development of Production Process of Activated Coke[C]. Development of Fundamental Technology for the City as a Study of the "Environment-friendly Project Research Report of Aichi Prefecture, Nagoya regional 2004.
  28. Piao G L, et al. Research and Development of High Temperature Coal Gas Shift Fuel Cell Power Generation Technology for Organic Waste[C]. Development of Fundamental Technology for the City as a Study of the "Environment-friendly Project Research Report of Aichi Prefecture, Nagoya regional 2004, 35-64.
  29. Piao G L, et al. Research and Development the Manufacturing Process of Dry off Hydrogen Sulfide Using Activated Coke [C]. Development of Fundamental Technology for the City as a Study of the "Environment-friendly Project Research Report of Aichi Prefecture, Nagoya regional 2004.
  30. Piao G L, et al. Research and Development of High Temperature Gas Conversion Technology of Wood Flour (Research and Development of the Issue with Great Potential) [J]. ケミカルエンジニヤリング, 2004, 49(4): 281-285.
  31. AdachiY, Kobayashi N, Piao G, et al. Research and development on gasification technology of organic waste material by using entrained-flow[C]. 10th Congress of Asian Pacific Confederation of Chemical Engineers, Kitakyushu, October 2004.
  32. Kanagawa K, Kobayashi N, Kobayashi J, Piao G, et al. Manufacturing of activated coke from ligneous biomass in a fluidized bed[C]. 10th Congress of Asian Pacific Confederation of Chemical Engineers, Kitakyushu, October 2004.
  33. Hendarsa A S, Kobayashi N, Piao G, et al. Simulation and scale-up study of gasification of organic waste materials in entrained flow down flow gasifier[C]. 6th Asian Symposium on Academic Activity for waste management, September, Padang, Indonesia, 2004.
  34. Piao G, KOBAYASHI N, TANAKA M, et al. Reformation of brown coal by hydro-thermal treatment[J]. Nippon Enerugi Gakkai Sekitan Kagaku Kaigi Happyo Ronbunshu, 2005, 42: 69-70.
  35. Kobyashi N, Itaya Y, Piao G, et al. The behavior of flue gas from RDF combustion in a fluidized bed[J]. Powder technology, 2005, 151(1): 87-95.
  36. Kobayashi N, Piao G, Itaya Y, Mori S. The de-hydrogen sulfide characteristic by the activated coke produced from ligneous waste[C]. ISETS05 (International Symposium on Eco Topia Science 2005), Nagoya, Japan, 2005:353-356.
  37. Sakabe M, Kanagawa K, Kobayashi N, Kobayashi J, Piao G, Hatano S, Itaya Y and Mori S. The de-hydrogen sulfide characteristic by the activated coke produced from ligneous waste[C]. International Symposium on EcoTopia Science 2005, Extended Abstracts, Nagoya, Japan, 2005:353-356.
  38. Okada N, Kobayashi N, Kobayashi J, Piao G, Hatano S, Itaya Y and Mori S. Liquefaction of pulverized ligneous biomass powder in hot compressed water by using microwave heating[C]//AIChE Annual Meeting. 2005.
  39. Kobayashi N, Piao G, Adachi Y, Itaya Y and Mori S. Gasification of wood powder in entrained down-flow furnace with auxiliary fuel burner[C]. 6th International Symposium on High Temperature Air Combustion and Gasification, Essen (Germany), October 17-19, (2005).
  40. Piao G, Kobayashi N, Adachi Y, et al. Gasification of wood powder in entrained down--flow furnace with auxiliary fuel burner[C]. The Development of Renewable Energy International Symposium and the 3rd Pan Yangtze River Delta Energy Science and Technology Forum, 2006.
  41. Kobayashi N, Tanaka M, Piao G, et al. High temperature wood biomass gasification process with air in a down draft furnace [J]. Chemical Industry, 2006, 57(4): 322-325.
  42. Piao G L, et al. The Process of High Temperature Gas Entrained Flow Type Air Blowing of Woody Biomass [J]. Chemical Industry, 2006, 57(4):322-325.
  43. Wu X, Kobayashi N, Piao G L, et al. Study on Coal Gas Gasification Technology of Coal Resources and High Ash Melting Point in China[C]. Coal science papers at the conference of the Japan Society of, Energy Association, 2006 (43): 53-54.
  44. Wu Xiao-jiang, Zhang Zhong-xiao, Piao Gui-lin, et al. Analysis of coal ash fusion characteristics of high fusibility coal blending with low’s with ternary phase diagram [J]. Clean Coal Technology, 2007, 13(3): 64-67.
  45. Wu Xiao-jiang, Zhang Zhong-xiao, Piao Gui-lin, et al. Experimental study on biomass gasification characteristics in high-temperature pressurized entrained flow gasifiers [J]. Journal of Power Engineering, 2007, 27(4): 629-634.
  46. Wu Xiao-jiang, Zhang Zhong-xiao, Piao Gui-lin, et al. Experimental study on gasification reaction characteristics of Chinese high ash fusion temperature coal with CO2 and steam at elevated temperature [J]. Proceeding of the CSEE, 2007, 27(32): 24-28.
  47. Wu X, Zhang Z, Piao G, et al. Experimental study on gasification characteristics of coal with high ash fusion temperature in lab-scale down-flow gasifier[C]. The 6th International Symposium on Coal Combustion Conference. 2007, WU Han, China.
  48. Wu X, Zhang Z, Piao G, et al. Experimental study on coal gasification characteristics in pressurized entrained flow gasifier[C]. Symposium of the Chinese society of Engineering Thermophysics.2007, Tianjin.
  49. Wang J, Zhang Z, Piao G, et al. Study on characteristics of coal gasification reaction with high ash melting coal[C]. Symposium of the Chinese society of Engineering Thermophysics.2007, Tianjin.
  50. Guoyan Chen, Zhongxiao Zhang, Xiaojiang Wu,Guilin Piao. Effect of O2/CO2 concentration on characteristic of coal char gasification reaction[C]. The 6th International Symposium on Coal Combustion Conference. 2007, WU Han, China.
  51. Xie Hao, Zhang Zhong-xiao, Wu Xiao-jiang, Piao Gui-lin. Numerical simulation of a lab-Scale pressured down-flow coal gasifier[C]. The 6th International Symposium on Coal Combustion Conference. 2007, WU Han, China.
  52. Kobayashi N, Guilin P, Kobayashi J, et al. A new pulverized biomass utilization technology[J]. Powder Technology, 2008, 180(3): 272-283.
  53. Wu Xiao-jiang, Zhang Zhong-xiao, Piao Gui-lin, et al. Experimental study on gasification characteristics of coal in lab-Scale down flow gasifier [J]. Journal of Engineering Thermophysics, 2008, 29(8):1431-1434.
  54. Piao G L, et al. Residue Gasification Characteristics of Woody Biomass Gasification in High Temperature Process [J]. Journal of Japanese Society of energy, 2009, 88(1): 50-57.
  55. Wu X, Zhang Z, Piao G, et al. Behavior of mineral matters in Chinese coal ash melting during char-CO2/H2O gasification reaction[J]. Energy & Fuels, 2009, 23(5): 2420-2428.
  56. Wu Xiao-jiang, Zhang Zhong-xiao, Piao Gui-lin, et al. Gasification characteristics of coal with high ash fusion temperature in lab-scale down-flow gasifier [J]. Journal of Combustion Science and Technology, 2009, 15(2): 182-186.
  57. Tao He, Jin Bao-sheng, Piao Gui-lin, et al. Static experiment and technology parameter study of flue gas desulphurization and denitrification by active coke [J]. Journal of Southeast University (Natural Science Edition), 2009, 39(3): 635-640. (in Chinese)
  58. Wang Xiao-lei, Piao Gui-lin, Xie Hao, et al. Study on selective catalytic reduction of NOx by activated carbon [C]. 2010 Chinese Society for Environmental Sciences Academic Conference, Shanghai, China, 2010. (in Chinese)
  59. Xie Hao, Piao Gui-lin. Application of denitrification process in the thermal power and steel industry in the removal of activated coke flue gas desulphurization [C]. 2010 Chinese Society for Environmental Sciences Academic Conference, Shanghai, China, 2010. (in Chinese)
  60. Zhao Xiao-yuan, Piao Gui-lin, Xie Hao, et al. Analysis of high performance activated bamboo carbon preparation method [C]. 2010 Chinese Society for Environmental Sciences Academic Conference, Shanghai, China, 2010. (in Chinese)
  61. Wu X, Zhang Z, Chen Y, Zhou T, Fan J, Piao G, Kobayashi N, Mori S and Itaya Y. Main mineral melting behavior and mineral reaction mechanism at molecular level of blended coal ash under gasification condition[J]. Fuel Processing Technology, 2010, 91(11): 1591-1600.
  62. Wu X, Zhou T, Chen Y, Zhang Z, Piao G, Kobayashi N, Mori S and Itaya Y. Mineral melting behavior of chinese blended coal ash under gasification condition[J]. Asia‐Pacific Journal of Chemical Engineering, 2011, 6(2): 220-230.    
  63. Zhang Z, Wu X, Zhou T, Chen Y, Hou N, Piao G, Kobayashi N, Itaya Y and Mori S. The effect of iron-bearing mineral melting behavior on ash deposition during coal combustion[J]. Proceedings of the Combustion Institute, 2011, 33(2): 2853-2861.
  64. Wang Xiao-lei, Piao Gui-lin, Xie Hao, et al. Selective catalytic reduction of NOx by activated carbon [J]. Journal of Southeast University (Natural Science Edition), 2011, 41(001): 145-149. (in Chinese)
  65. Xie Hao, Zhang Zhong-xiao, Piao Gui-lin. Research on model of integrated biomass gasification and fuel cell cogeneration system [J]. Chinese Journal of Power Sources, 2012, 36(12): 1824-1826. (in Chinese)
  66. Chen Li-fang, Piao Gui-lin, Zhang Ju-bing, et al. Simulation modeling of coal gasification in pressurized fluidized bed [C]. The 6th Jiangsu Province Engineering Thermophysics Conference, Nanjing, China, 2012. (in Chinese)
  67. Pan Wei-lin, Piao Gui-lin, Xie Hao, et al. Experimental study on combustion characteristics of biomass char [J]. Clean Coal Technology, 2013, 19 (1): 83-86. (in Chinese)
  68. Wang Dong-dong,Xie Hao,Piao Gui-lin, et al. Experimental study on catalytic decomposition of simulated biogas for carbon nanotubes [J]. Clean Coal Technology, 2013, 19(2): 59-62. (in Chinese)
  69. Chen Ding-nan, Piao Gui-lin, Zhang Ju-bing, et al. Preparation of TiO2-AC composite material and experimental study on its photocatalysis property [J]. Clean Coal Technology, 2013, 19(3): 60-64. (in Chinese)
  70. Chen Li-fang, Piao Gui-lin, Xie Hao, et al. Removal of waste and combustion pollutants by activated carbon [C]. 2013 Chinese Society for Environmental Sciences Academic Conference, Kunming, China, 2013. (in Chinese)
  71. Chen Li-fang, Piao Gui-lin, Zhang Ju-bing, et al. Simulation modeling of coal gasification in pressurized fluidized bed [J]. Journal of Chinese Society of Power Engineering, 2013, 34(2): 134-139. (in Chinese)
  72. Zhang Bai-qiang, Piao Gui-lin, Wang Dong-dong, et al. Experimental study on carbon nannotube produced by simulated biogas catalytic cracking in a fluidized-bed reactor[C]. The 12th Japan-China Symposium on Coal an C1 Chemistry, Oct 28-Nov 1, 2013, Fukuoka, Japan, (C107).
  73. Nobusuke KOBAYASHI, Hirotaka IWATSU, Seinan SO, Naoto WATANABE, Toichiro SAKAKI, Yasuhiro TANABE, Yoshinori ITAYA and Guilin PIAO. High temperature gasification behavior of sludge in the entrained down flow gasifier[J]. Journal of the Japan Institute of Energy, 2013, 92:936-944.
  74. Zhang Ju-bing, Zhou Ying, Zhong Zhao-ping, Piao Gui-lin, et al. Experimental study on simultaneous desulfurization and denitrification with ammonia in WFGD system combined with plasma oxidation of NO[J]. Journal of Southeast University (Natural Science Edition), 2014, 44(6): 1194-1199. (in Chinese)
  75. Li Shuai, Zhang Ju-bing, Piao Gui-lin, et al. Study on characterization of woody biomass isothermal carbonization[J]. Journal of Chinese Society of Power Engineering, 2015, 35(6): 495-500. (in Chinese)
  76. Xia Guang-bi, Piao Gui-lin, Zhang Ju-bing, et al. Research on characteristics of co-gasification of biomass char and coal[J]. Journal of Chinese Society of Power Engineering, 2015, 35(8): 681-686. (in Chinese)
  77. Guest speaker at the international conference
  78. Development status RDF Technology in Japan, Korea Japan waste treatment technology international seminar, 2001, Korea Suwon.
  79. Development organic waste recycling technology -- organic waste high temperature gasification fuel cell power generation technology on "recycling oriented society to build international conference", Yokkaichi, In Japan in 2004 International Conference.
  80. Present situation and future development of energy and environment in China. The International Workshop on energy and environment, Saidama University, Japan, 2005.
  81. Biomass gasification technology, International Symposium on renewable energy, 2006, Nanjing, China.
  82. From China to see Japan - Common Development of the Scene through the Environment from Japan and China The Pace of Cooperation in the Energy Sector, the International Joint Conference on Industry University Government, Hokkaido University, 11. 2010.
  83. The comprehensive utilization of biomass, International Symposium on coal chemical industry, Anhui Fuyang, China, 2011.11.
  84. Waste disposal technology, Xi'an University of Architecture and Technology, 2004.
  85. Biomass gasification technology, Qingdao Biological Research Institute of Chinese Academy of Sciences, 2007.
  86. Development status RDF Technology in Japan, Southeast China University, 2004.
  87. Constructing the circular environmental protection city design, University Of Science and Technology of Hebei, 2006.

Patents

  • Piao G L, et al. Method and Conversion Device of Organic Waste Gas, 2003.2, Japan, Japanese patent application: 2003-027012.
  • Piao G L, et al. Gasification Device for Solid Organic Waste, 2003.12, Japan, Japanese patent application: 2003-401356.
  • Piao G L, et al. Biomass fine particles supply apparatus, 2003.12, Japan, Japanese patent application: 2003-401340.
  • Jin B S, Piao G L, Xiao R, et al. Device for High Carbon Conversion of Coal Gasification, 2009.7, China, ZL200810155106.3.
  • Jin B S, Piao G L, Xiao R, et al. Device and Method for Coal Gasification in High Density Pressurized Fluidized Bed, 2011.7, China, ZL200810155106.3.
  • Piao G L, Xie H, Cai J, et al. Device for Activated Coke Desulfurization Regeneration, 2011.12, China, ZL201010117624.3.
  • Piao G L, Liang Z L, Liang C H, et al. Device and Method for Organic Solid Fuel Pyrolysis Gasification in Two-stage Tandem Fluidized Bed, 2013.11, China, ZL201210243751.7.

Contact

  • Add.: 78 Bancang St., Nanjing 210042, P. R. China
  • Tel: +86-25-85481105 (Office); Fax: +86-25-85481105
  • E-mail: piaoguilin@njnu.edu.cn