Researcher

Name

Douyan Wang

Research field

Pulsed Power Science

王 斗艶

Research content

"Generation of sub-nanoseconds pulsed power and its applications for pollution control and bioelectrics"

Pulsed power is instantaneous ultra-high power with high energy density (10 -10J/m). By controlling and utilizing it in a narrow space and an instantaneous time, phenomena and reactions that are not attained by conventional and ordinary methods can be achieved. Pulsed power was first developed during World War II for use in radar, because radar requires short high power pulses. After the war, development continued in other applications especially for peaceful purposes. At the present time, the applications using pulsed power technologies are wide in varieties which cover the solids, liquids, super critical fluids, gases, and bioelectrics. Bioelectrics refers to the use of pulsed power, powerful pulsed electric or magnetic field for extremely short periods of time, non-thermal plasmas in gases or liquids and shock waves, to give novel physical stresses to biological cells, tissues and/or organisms as well as bacteria. Bioelectrics is an interdisciplinary academic field over physics, chemistry, biology, medical science, agriculture, environmental, mechanical and electrical engineering, and is expected to open up new science and technology. Non-thermal plasmas, in which the mean energy of the electrons is substantially higher than that of the ions and the neutrals, offer a major advantage in reducing the energy required to remove pollutants.



Dr. Wang works on the fields of air pollution control, ozone generation, nitric oxide generation, water processing, recycling of waste concrete scraps, transcriptional activation of plant cells, genetic transduction using plasmas, and applications for plant factories. For pollution control, the critical factor to enable this technique for industrial application is to improve the energy efficiency of the plasma processing. The answer coming from our previous studies shows the pulse duration of the applied voltage has a strong influence on obtaining higher energy efficiency, typically in nano-seconds or shorter time duration. Dr. Wang is recently developing a high-voltage pulsed power generator having a pulse duration of 5ns and voltage rise and fall time of 2ns each.

Education

  • 1998 Department of Electrical Engineering and Computer Science, Kumamoto University (Bachelor Degree)
  • 2000 Graduate School of Science and Technology, Kumamoto University (Master Degree in Electrical & Computer Engineering)
  • 2005 Graduate School of Science and Technology, Kumamoto University (Doctoral Degree in Electrical Engineering)

Professional Occupation

  • 2000-2002 Engineer, Hitachi, Ltd.
  • 2003-2005 Research Fellow, Japan Society for the Promotion of Science (JSPS) (DC)
  • 2003-2004 Visiting Researcher, Center for Pulsed Power & Power Electronics, Texas Tech University, USA
  • 2005-2007 Research Associate, Technical Staff, 21st Century Center of Excellence (COE) Program "Pulsed Power Science and Its Applications", Kumamoto University
  • 2007-present Assistant professor, Priority Organization for Innovation and Excellence, Kumamoto University

Links

Kumamoto University Global COE Program "Global Initiative Center for Pulsed Power Engineering"
This project runs on the commission of he Special Coordination Funds for Promoting Science and Technology "Promotion of Environmental Improvement to Enhance Young Researchers' Independence" project.

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