Basic
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Research
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Recent
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Industrial
Technology
嶄猟井
 
      Ting-Jie Wang  Professor

Deparment of Chemical Engineering
Tsinghua University
Beijing 100084, China

Tel: +86-10-62788993
Fax: +86-10-62772051
Email: wangtj@tsinghua.edu.cn

   

 

Recent Publications:

International Journals:

  1. Yong Liang, Keyi Yu, Qinzhong Zheng, Jiuren Xie, Ting-Jie Wang*. Thermal treatment to improve the hydrophobicity of ground CaCO3 particles modified with sodium stearate. Applied Surface Science, 436 (2018): 832C838.
  2. Di An, Ling Yang, Boyang Liu, Ting-Jie Wang*,Chengyou Kan. The diffusion performance of fertilizer nutrient through polymer latex film. Journal of Agricultural and Food Chemistry, 2017, 65(50): 10868-10874.
  3. Ling Yang, Di An, Ting-Jie Wang*, Chengyou Kan and Yong Jin. Photodegradation of polymer materials used for film coatings of controlled-release fertilizers. Chemical Engineering & Technology, 2017, 40(SI): 1611-1618.
  4. Chang Zhang, Yingzhen Li, Ting-Jie Wang*, Yanping Jiang, Jason Fok. Synthesis and properties of a high-capacity iron oxide adsorbent for fluoride removal from drinking water. Applied Surface Science, 425(2017): 272-281.
  5. Chang Zhang, Yingzhen Li, Yanping Jiang, Ting-Jie Wang*. Size-dependent fluoride removal performance of a magnetic Fe3O4@Fe-Ti adsorbent and its defluoridation in a fluidized bed. Industrial & Engineering Chemistry Research, 2017, 56 (9): 2425-2432.
  6. Di An, Boyang Liu, Ling Yang, Ting-Jie Wang*, Chengyou Kan. Fabrication of graphene oxide/polymer latex composite film coated on KNO3 fertilizer to extend its release duration. Chemical Engineering Journal, 311(2017): 318-325.
  7. Yong Liang, Keyi Yu, Jiuren Xie, Qinzhong Zheng, Ting-Jie Wang*. High hiding power and weather durability of film-coated titanium dioxide particles with a yolk-shell structure. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2017, 520(1): 736-742.
  8. Ling Yang, Di An, Ting-Jie Wang*, Chengyou Kan, Yong Jin. Swelling and diffusion model of a hydrophilic film coating on controlled-release urea particles. Particuology, 30(2017): 73-82.
  9. Yingzhen Li, Yanping Jiang, Ting-Jie Wang*, Chang Zhang, Haifeng Wang. Performance of fluoride electrosorption using micropore-dominant activated carbon as an electrode. Separation and Purification Technology, 172(2017): 415-421.
  10. Yingzhen Li, Chang Zhang, Yanping Jiang, Ting-Jie Wang*, Haifeng Wang. Effects of the hydration ratio on the electrosorption selectivity of ions during capacitive deionization. Desalination, 399(2016): 171-177.
  11. Yong Liang; Bing Qiao; Ting-Jie Wang*, Han Gao; Keyi Yu. Effects of porous films on the hiding power of pigmentary titanium dioxide particles. Applied Surface Science, 2016, 387: 581-587.
  12. Di An, Ling Yang, Ting-Jie Wang*, Boyang Liu.  Separation performance of graphene oxide membrane in aqueous solution. Industrial & Engineering Chemistry Research. 2016, 55(17): 4803-4810.
  13. Bing Qiao, Yong Liang, Ting-Jie Wang*, Yanping Jiang.. Surface modification to produce hydrophobic nano-silica particles using sodium dodecyl sulfate as a modifier. Applied Surface Science, 2016, 364: 103-109.
  14.  Chang Zhang, Yingzhen Li, Ting-Jie Wang*, Yanping Jiang, Haifeng Wang. Adsorption of drinking water fluoride on a micron-sized magnetic Fe3O4@Fe-Ti composite adsorbent. Applied Surface Science, 2016, 363: 507-515.
  15. Bing Qiao, Ting-Jie Wang*, Han Gao, Yong Jin.High density silanization of nano-silica particles using γ-aminopropyltriethoxysilane (APTES). Applied Surface Science, 2015, 351: 646-654.
  16. Chang Zhang, Lin Chen, Ting-Jie Wang*, Chaoli Su, Yong Jin. Synthesis and properties of a magnetic core-shell composite nano-adsorbent for fluoride removal from drinking water. Applied Surface Science, 2014, 317: 552-559.
  17. Han Gao, Bing Qiao, Ting-Jie Wang*, Dezheng Wang, Yong Jin.Cerium oxide coating of titanium dioxide pigment to decrease its photocatalytic activity. Industrial & Engineering Chemistry Research, 2014, 53(1): 189-197.
  18. Chaoli Su, Lin Chen, Ting-Jie Wang*, Lixin Yu, Yong Jin. Granulation of Fe-Al-Ce nano-adsorbent for fluoride removal from drinking water using inorganic binder. Water Science & Technology: Water Supply, 2013, 13(5): 1309-1316.
  19. Guanda Wang, Ling Yang, Rui Lan, Ting-Jie Wang*, Yong Jin. Granulation by spray coating aqueous solution of ammonium sulfate to produce large spherical granules in a fluidized bed. Particuology, 2013, 11(8): 483-489.
  20. Bingxin Wei, Lin Zhao, Ting-Jie Wang*, Han Gao, Haixia Wu, Yong Jin. Photo-stability of TiO2 particles coated with several transition metal oxides and its measurement by rhodamine-B degradation. Advanced Powder Technology, 2013, 24(3): 708-713.
  21. Rui Lan, Guanda Wang, Ling Yang, Ting-Jie Wang*, Chengyou Kan, Yong Jin. Prediction of release characteristics of film coated urea from structure characterization data of the film. Chemical Engineering & Technology, 2013, 36(2): 347-354.
  22. Lin Chen, Shuai He, Boyang He, Ting-Jie Wang*, Chaoli Su, Chang Zhang, Yong Jin. Synthesis of iron-doped titanium oxide nanoadsorbent and its adsorption characteristics for fluoride in drinking water. Industrial & Engineering Chemistry Research, 2012, 51(40): 13150-13156.
  23. Lin Chen, Boyang He, Shuai He, Ting-Jie Wang*, Chaoli Su, Yong Jin. Fe-Ti oxide nano-adsorbent synthesized by co-precipitation for fluoride removal from drinking water and its adsorption mechanism. Powder Technology, 2012, 227(1): 3-8.
  24. Bingxin Wei, Lin Zhao, Ting-Jie Wang*, Yong Jin. Detrimental thixotropic thinning of filter cake of SiO2-Al2O3 composite coated TiO2 particles and its control. Industrial & Engineering Chemistry Research, 2011, 50(24): 13799-13804.
  25. Rui Lan, Yonghui Liu, Guanda Wang, Ting-Jie Wang*, Chengyou Kan, Yong Jin. Experimental modeling of polymer latex spray coating for producing controlled-release urea. Particuology, 2011, 9(5): 510-516.
  26. Haixia Wu, Ting-Jie Wang*, Lin Chen, Yong Jin, Yu Zhang, Xiaomin Dou. Granulation of Fe-Al-Ce hydroxide nano-adsorbent by immobilization in porous polyvinyl alcohol for fluoride removal in drinking water. Powder Technology, 2011, 209(1): 92-97.
  27. Lin Chen, Ting-Jie Wang*, Haixia Wu, Yong Jin, Yu Zhang, Xiaomin Dou. Optimization of a Fe–Al–Ce nano-adsorbent granulation process that used spray coating in a fluidized bed for fluoride removal from drinking water. Powder Technology, 2011, 206(3): 291-296.
  28. Haixia Wu, Ting-Jie Wang*, Lin Chen, Yong Jin, Yu Zhang, Xiaomin Dou. The roles of the surface charge and hydroxyl group on a Fe-Al-Ce adsorbent in fluoride adsorption. Industrial & Engineering Chemistry Research, 2009, 48 (9): 4530-4534.
  29. Lin Chen, Haixia Wu, Ting-Jie Wang*, Yong Jin, Yu Zhang, Xiaomin Dou. Granulation of Fe-Al-Ce nano-adsorbent for fluoride removal from drinking water by spray coating on sand in a fluidized bed. Powder Technology, 2009, 193(1): 59-64.
  30. Haixia Wu, Ting-Jie Wang*, Xiaomin Dou, Bei Zhao, Lin Chen, Yong Jin. Spray coating of adsorbent with polymer latex on sand particles for fluoride removal in drinking water. Industrial & Engineering Chemistry Research, 2008, 47(14): 4697-4702.
  31. Xiaoyong Fang, Ting-Jie Wang*, Haixia Wu, Yong Jin. Surface chemical modification of nanosized oxide particles with a titanate coupling reagent in isopropanol. Industrial & Engineering Chemistry Research, 2008, 47(5): 1513-1517.
  32. Yonghui Liu, Ting-Jie Wang*, Liang Qin, Yong Jin. Urea particle coating for controlled release by using DCPD modified sulfur. Powder Technology, 2008, 183(1): 88-93.
  33. Haixia Wu, Ting-Jie Wang*, Junling Duan, Yong Jin. Effects of -COOH groups on organic particle surface on hydrous alumina heterogeneous coating. Industrial & Engineering Chemistry Research, 2007, 46(26): 4363-4367.
  34. Haixia Wu, Ting-Jie Wang*, Junling Duan, Yong Jin. Effects of SO42-on the heterogeneous precipitation coating of hydrous alumina on TiO2 particles in an aqueous process. Industrial & Engineering Chemistry Research, 2007, 46(11): 3590-3594.
  35. Haixia Wu, Ting-Jie Wang*, Yong Jin. Effects of -OH groups on Fe3O4 particles on the heterogeneous coating in a hydrous alumina coating process. Industrial & Engineering Chemistry Research, 2007, 46(3): 761-766.
  36. Liang Guo, Guangling Pei, Ting-Jie Wang*, Zhanwen Wang, Yong Jin. Polystyrene coating of Fe3O4 particles using dispersion polymerization. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2007, 293(1-3): 58-62.
  37. Zhiwen Wang, Ting-Jie Wang*, Zhanwen Wang, Yong Jin. The adsorption and reaction of a titanate coupling reagent on the surfaces of different nano-particles in supercritical CO2. Journal of Colloid and Interface Science, 2006, 304(1): 152-159.
  38. Xin Li, Ting-Jie Wang*, Yong Jin. A granulation process for producing spherical particles of a rubber antioxidant in a water cooling tower. Chemical Engineering & Technology , 2006, 29(10): 1273-1280.
  39. Haixia Wu, Ting-Jie Wang*, Yong Jin. Morphology ^phase diagram ̄ of the hydrous alumina coating on TiO2 particles during aqueous precipitation. Industrial & Engineering Chemistry Research. 2006, 45(15): 5274-5278.
  40. Haixia Wu, Ting-Jie Wang*, Yong Jin. Film coating process of hydrated alumina on TiO2 particles. Industrial & Engineering Chemistry Research. 2006, 45(4): 1337-1342.
  41. Jianping Pan, Ting-Jie Wang*, Junjie Yao, Yong Jin. Granule transport and mean residence time in horizontal drum with inclined flights. Powder Technology. 2006, 162(1): 50-58.
  42. Zhiwen Wang, Ting-Jie Wang*, Zhanwen Wang, Yong Jin. Organic modification of nano-SiO2 particles in supercritical CO2. The Journal of Supercritical Fluids. 2006, 37(1): 125-130.
  43. Yuanzhou Xi, Ting-Jie Wang*, Xin Li, Yong Jin. Cooling and solidification process of melted drops in an immiscible cooling medium. Chemical Engineering & Technology. 2005, 28(6): 712-719.
  44. Jiuyang Fang, Yuanzhou Xi, Ting-Jie Wang*, Yong Jin. A novel granulation technology for producing spherical wax particles. Chemical Engineering & Technology. 2004, 27(9): 1039-1047.
  45. Zhiwen Wang, Ting-Jie Wang*, Zhanwen Wang, Yong Jin. Organic modification of ultra-fine particles using carbon dioxide as the solvent. Powder Technology. 2004, 139(2): 148-155.
  46. Jun Yang, Ting-Jie Wang*, Hong He, Fei Wei, Yong Jin. Particle size distribution and morphology of in situ suspension polymerized toner. Industrial & Engineering Chemistry Research. 2003, 42 (22): 5568-5575.
  47. Yi Wang, Ting-Jie Wang*, Yi Yang, Yong Jin. Resonance characteristics of a vibrated fluidized bed with a high bed hold-up. Powder Technology. 2002, 127 (3): 196-202.
  48. Yulan Lin, Ting-Jie Wang*, Yong Jin. Surface characteristics of hydrous silica coated TiO2 particles. Powder Technology. 2002, 123(3): 196-200.
  49. Xiaoyu Sun, Ting-Jie Wang*, Zhiwen Wang, Yong Jin. The characteristics of coherent structures in the rapid expansion flow of the supercritical carbon dioxide. The Journal of Supercritical Fluids. 2002, 24(3): 231-237.
  50. Ting-Jie Wang*, A Tsutsumi, H Hasegawa et al. Mechanism of particle coating granulation with RESS process in a fluidized bed. Powder Technology. 2001, 118(3): 229-235.
  51. Ting-Jie Wang*, Yong Jin, A Tsutsumi. Energy transfer mechanism in a vibrating fluidized bed . Chemical Engineering Journal. 2000, 78(2): 115-123.
  52. Ting-Jie Wang*, Yong Jin, Zhanwen Wang, Zhiqing Yu. A study of the morphology of the goethite crystallization process. Chemical Engineering Journal. 1998, 69(1): 1-5.
  53. Ting-Jie Wang*, Yong Jin, Zhanwen Wang and Zhiqing Yu. Characteristics of wave propagation in a vibrating fluidized bed. Chemical Engineering & Technology. 1997, 20(9): 606-611.

Chinese Journals:

  1. ZHANG Yong-hua, YANG Ling, WANG Ting-jie, Characteristics of overcapacity and strategy to face in nitrogen fertilizer industry, Modern Chemical Industry. 2015,35(6): 7-12
  2. An DiWang TingjieJin Yong, Using drip irrigation of water and fertilizer for synergic development of industry and agriculture, Engineering Science. 2015, 17(5): 120-125
  3. QIAO Bing, GAO Han, WANG Tingjie, JIN Yong,Process and mechanism of surface modification of silica with silane coupling agent APTS, CIESC Journal. 2014,65(7): 2629-2637
  4. Aosiman TuerdiYang LingAn DiWang Tingjie, Progresses in Air Stripping for Treatment of Ammonia Wastewater, Petrochemical Technolog. 2014,43(11): 1348-1353
  5. AN Di, YANG Lin, WANG Guanda, LAN Rui, WANG Tingjie, JIN Yong, Mechanisms of phosphorus fixation in soils and efficient utilization of phosphate fertilizer, Chemical Industry and Engineering Progress. 2013,32(8): 1967-1973
  6. ZHAO Lin, GAO Han, WEI Bingxin, WANG Tingjie, JIN Yong, Evaluation of photocatalytic activity of pogmentary titania, CIESC Journal, 2013,64(7):2453-2461
  7. WEI Bingxin, WANG Tingjie, ZHAO lin, CHEN Lin, JIN Yong, Protocatalytic Reaction Process on Titania Particle Surface, Petrochemical Technology, 2013, 41(2):219-223
  8. WANG Zhaongxiao, WANG Tingjie, GUO Fen, JIN Yong, Water removal from wax particle surface by gas shear flow, Journal of Beijing University of Chemical Technology(Nature Science), 2011,38(5):1-5
  9. CHEN Lin, WANG Ting-Jie, JIN Yong, ZHANG Yu, Absorption Charateristics of Fluoride with Granulated Fe-Al-Ce Nano-adsorbent, The Chinese Journal of Process Engineering, 2010,10(6):1200-1205
  10. LI Bei, WANG TingJie, GUO Fen, WU HaiXia, pH Control of suspensions of titania coated with silica and alumina, Journal of Beijing University of Chemical Technology(Natural Science Edition), 2010,37(6):41-45
  11. YANG Xiangdong,CHANG Jingtao,LAN Rui,WANG Tingjie,JIN Yong, Crop nitrogen uptake and its requirement on film coated controlled-release fertilizer, Chemical Industry and ENgineering Progress, 2010,29(8):1530-1540
  12. Chun-lan, WANG Ting-jie, WU Hai-xia, DUAN Jun-ling, JIN Yong, Preparation of Magnetophoresis Microcapsules and Displaying Properties of Their Coating Film, The Chinese Journal of Process Engineering, 2010,10(3):619-624
  13. WU Hai-xia,LI Bei,WANG Ting-jie,JIN Yong, Silicon and Alumina Coating of TiO2 Particles and Scaling of Photo-catalysis,The Chinese Journal of Process Engineering, 2009,9(S 2):39-44
  14. QIN Liang,WANG Ting-Jie,LIU Yong-Hui,JIN Yong, Characteristics of Melted Sulphur Granulation Process in a Water Cooling Tower for Spherical Particles, The Chinese Journal of Process Engineering, 2009,9( S 2):12-16
  15. LIU Yonghui,WANG Tingjie,KAN Chengyou,WANG Minghao,JIN Yong, Development in polymer latex coated fertilizer for controlled release,Chemical Industry and Engineering Progress, 2009,28(9):1589-1595
  16. TJ Wang. Vibration fluidized bed, Handbook of Fluidization, 709-718. Ed. by Mooson Kwauk, Hongzhong Li. Chemical Industry Press, 2008.01, Beijing, China.
  17. PAN Jian-Ping, WANG Ting-Jie, YAO Jun-Jie, JIN Yong. Improvement on method for determination of nitrogen concentration during release from controlled- and slow-release nitrogenous fertilizers. Chemical Fertilizer Industry. 2006, 33(3): 24-27
  18. YANG Yi, WANG Ting-Jie, JIN Yong. The application of polymer materials in microencapsulated electrophoretic display. Polymer Materials Science & Technology. 2005, 21(5): 1-4, 9.
  19. PEI Guang-Ling, WANG Ting-Jie, YANG Yi, JIN Yong. Preparation and properties of microcapsules for electrophoretic display. Acta Physico-Chimica Sinica . 2005, 21(4): 430-434.
  20. YANG Yi, WANG Ting-Jie, PEI Guang-Ling, JIN Yong. Direct preparation process of microcapsules by in situ polymerization of urea-formaldehyde. Journal of Chemical Engineering of Chinese Universities. 2005, 19(3): 338-343.
  21. Y ao Jun-Jie, W ang Ting-Jie, Pan Jian-Ping, Kan Cheng-You, Jin Yong. Slow-release urea preparation by film coating with polymer latex. Chemical Industry and Engineering Progress . 2005, 24(6): 666-670.
  22. Wang Yi, Wang Ting-Jie, Jin Yong. Characteristics of flow regimes in a vibrated fluidized bed using chaotic analysis. Journal of Chemical Industry and Engineering (China) . 2003, 54 (12): 1696-1701.
  23. Chen De-Ming, Wang Ting-Jie, Yu Shan-Jiang, Jin Yong. The properties, applications and preparations of nano-scale TiO2 particles. Journal of Materials Engineering. 2002, (11): 42-47.
  24. Qin Cao, Wang Ting-Jie, Jin Yong. The coating process of nano-scale hydrous silica film on TiO2 particles by chemical deposition in aqueous solution*. Acta Physico-Chimica Sinica . 2002, 18(10): 884-889.
  25. Chen De-Ming, Wang Ting-Jie, Yu Shan-Jiang, Jin Yong. Review on the research and development of control-release urea and slow-release urea. Chemical Industry and Engineering Progress . 2002, 21(7): 457-463.
  26. QIN Cao, WANG Ting-Jie, JIN Yong. Nano-scale film coating of alumina on TiO2 particles. The Chinese Journal of Process Engineering. 2002, 2(S): 87-93.
  27. WANG Yi, WANG Ting-Jie, YANG Yi, JIN Yong. Improvement of fluidization behavior by the introduction of interior vibration into a fluidized bed with a high bed hold-up. The Chinese Journal of Process Engineering. 2002, 2(S): 416-421.
  28. SUN Xiao-Yu, WANG Ting-Jie, JIN Yong. Review on the research of RESS process and its application for fine particle preparation. Chemical Industry and Engineering Progress . 2002, 21(1): 29-33.
  29. CUI Ai-Li, WANG Ting-Jie, JIN Yong. Thermodynamic research on the coating process of silica on titanate particles. Chemical Journal of Chinese Universities. 2001, 22(9): 1543-1545.
  30. Shi Wei-Xian, Yang Jun, Wang Ting-Jie, Jin Yong. Surface organic modification of magnetic iron oxide black particles. Acta Physico-Chimica Sinica . 2001, 17(6): 507-510.
  31. HE Hong, YANG Jun, WANG Ting-Jie, JIN Yong. Experimental conditions and resin properties control in the toner preparation process by suspension polymerization. Journal of Chemical Engineering of Chinese Universities. 2001, 15(6): 538-545.
  32. Yu Shan-Jiang, Wang Ting-Jie, Jin Yong. Progress in manufacture of large granular urea-based phosphates. Journal of the Chemical Fertilizer Industry. 2001, 28(5): 34-35, 37.
  33. HE Hong, YANG Jun, WANG Ting-Jie, WANG Zhan-Wen, JIN Yong. The size distribution characteristics of magnetic particles prepared by suspension polymerization. Journal of Chemical Engineering of Chinese Universities. 2001, 15(3): 277-281.
  34. Lin Yu-Lan, Wang Ting-Jie, Qin Cao, Jin Yong. Surface organic modification of SiO2   & Al2O3 coated TiO2 particles with titanate coupling reagent. Acta Physico-Chimica Sinica . 2001, 17(2): 169-172.
  35. Wang Ting-Jie, Xiao Shuai-Gang, Cui Ai-Li, Lin Yu-Lan, Jin Yong. The characteristics of dynamic pressure in an impinging jet. Journal of Chemical Industry and Engineering (China) . 2001, 52(2): 153-157.
  36. XIAO Shuai-Gang, WANG Ting-Jie, WANG Zhan-Wen, JIN Yong. The elastic interaction between the bed and distributor in a vibrated fluidized bed. The Chinese Journal of Process Engineering. 2001, 22(2): 132-137.
  37. Wang Ting-Jie, Tsutsumi Atsushi, Jin Yong. Fine particle coating for release control by using RESS process in a fluidized bed. Journal of Chemical Industry and Engineering (China) . 2001, 52(1): 67-72. [5th CAST Excellent Academic Paper Publication Award]
  38. CUI Ai-Li, WANG Ting-Jie, HE Hong, JIN Yong. Dispersion behavior of ultrafine titanium dioxide particles in aqueous solution. The Chinese Journal of Process Engineering. 2001, 22(1): 99-101.
  39. LIN Yu-Lan, WANG Ting-Jie, QIN Cao, YANG Jun, JIN Yong. Organic modification on the sub-micron particles of  TiOpre-coated with SiO2 and Al2O3 . Chemical Journal of Chinese Universities. 2001, 22(1): 104-107.
  40. Liu Bing, Wang Ting-Jie, Qian Wei-Zhong, Jin Yong. Advances in technology for manufacture of large granular urea. Journal of the Chemical Fertilizer Industry. 2000(12): 28-30, 33.
  41. Wang Ting-Jie, Sun Xiao-Yu, Jin Yong. The temperature and turbulence characteristics in RESS process . Journal of Chemical Industry and Engineering (China) . 2000, 51(S): 79-83. (English)
  42. Cui Ai-Li, Wang Ting-Jie, Jin Yong. The dynamic model of the coating process of silicon dioxide on titanium dioxide particles. Chemical Journal of Chinese Universities. 2000, 21(10): 1560-1562.
  43. WANG Ting-Jie, TSUTSUMI Atsushi, JIN Yong. A novel technology for fine particle coating by using rapid expansion of supercritical fluid solution. Chemical Industry and Engineering Progress . 2000, 19(4): 42-47.
  44. CUI Ai-Li, Wang Ting-Jie, Jin Yong. TiO2 particle coating and structure analysis of surface coated with SiO2 and Al2O3 . Engineering Chemistry & Metallurgy. 1999, 20(2): 178-181.
  45. CUI Ai-Li, WANG Ting-Jie, LIN Yu-Lan, JIN Yong. Synthesis of ultrafine calcium carbonate with controlled shape. Engineering Chemistry & Metallurgy. 1998, 19(4): 293-297.
  46. WANG Ting-Jie, JIN Yong, Wang Zhan-Wen, YU Zhi-Qing. Nucleation and growth process of the needle-like goethite crystals. Journal of Chemical Industry and Engineering (China) . 1998, 49(2): 201-207.