WANG Daohong

J-GLOBAL         Last updated: Dec 18, 2019 at 11:21
 
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Name
WANG Daohong
Affiliation
Gifu University
Section
Faculty of Engineering

Research Areas

 

Academic & Professional Experience

 
Oct 2015
 - 
Today
Gifu University
 

Published Papers

 
Temporal and Spatial Characteristics of Preliminary Breakdown Pulses in Intracloud Lightning Flashes
Shi, D., Wang, D., Wu, T., & Takagi, N.
Journal of Geophysical Research:Atmospheres      Dec 2019   [Refereed]
Haitao Huang, Daohong Wang, Ting Wu, Nobuyuki Takagi
Journal of Geophysical Research: Atmospheres   124 11143-11154   Nov 2019   [Refereed]
© 2019. American Geophysical Union. All Rights Reserved. We have analyzed the propagation process of nine dart leaders in four natural negative lightning flashes observed by a high speed optical system LAPOS 5. The propagation speeds range from 0....
Panliang Gao, Daohong Wang, Dongdong Shi, Ting Wu, Nobuyuki Takagi
Atmosphere   10    Oct 2019   [Refereed]
© 2019 by the authors. We characterized 205 multiple-termination negative cloud-to-ground (CG) lightning flashes that were imaged by the Fast Antenna Lightning Mapping Array (FALMA) in Japan during the summer of 2017. The parameters we used includ...
Ting Wu, Daohong Wang, Nobuyuki Takagi
Journal of Geophysical Research: Atmospheres   124 9983-9995   Sep 2019   [Refereed]
©2019. American Geophysical Union. All Rights Reserved. We have performed a statistical study on velocities of positive leaders in 553 intracloud (IC) and 220 negative cloud-to-ground (−CG) flashes. It is found that velocities of positive leaders ...
Dong Zheng, Daohong Wang, Yijun Zhang, Ting Wu, Nobuyuki Takagi
Journal of Geophysical Research: Atmospheres   124 7179-7206   Jul 2019   [Refereed]
©2019. American Geophysical Union. All Rights Reserved. The charge distribution of some cells in three winter thunderstorms in the Hokuriku region of Japan is investigated based on Lightning Mapping Array (LMA) flash data. The vertical arrangement...
Ting Wu, Daohong Wang, Nobuyuki Takagi
Journal of Geophysical Research: Atmospheres   124 6982-6998   Jul 2019   [Refereed]
©2019. American Geophysical Union. All Rights Reserved. Intracloud (IC) lightning flashes are normally initiated below 10 km and start with upward negative leaders. In this paper, we report a special type of IC flash called “downward positive IC (...
Mi Zhou, Xiaowei Su, Jianguo Wang, Yongyin Lu, Daohong Wang, Yabei Fan, Li Cai, Yadong Fan
IEEE Transactions on Electromagnetic Compatibility   61 766-777   Jun 2019   [Refereed]
© 1964-2012 IEEE. In cloud-to-ground lightning flash, a varying return stroke speed during the propagation process along the lightning channel has been extensively reported. It is also reported that as the return stroke propagates upward, the wave...
Daohong Wang, Ting Wu, Nobuyuki Takagi
2019 11th Asia-Pacific International Conference on Lightning, APL 2019      Jun 2019   [Refereed]
© 2019 IEEE. we have examined the accuracy of locating return strokes with Fast Antenna Lightning Mapping Array (FALMA) after excluding CG flashes that may have multiple striking points with different locations. The mean and median errors are 27.4...
Dongdong Shi, Daohong Wang, Ting Wu, Nobuyuki Takagi
Journal of Geophysical Research: Atmospheres   124 8501-8510   Jan 2019   [Refereed]
©2019. American Geophysical Union. All Rights Reserved. Using the negative cloud-to-ground lightning cases well located by the Fast Antenna Lightning Mapping Array, we have examined the general characteristics of the preliminary breakdown (PB) and...
Haitao Huang, Daohong Wang, Ting Wu, Nobuyuki Takagi
Journal of Geophysical Research: Atmospheres   123 12597-12605   Nov 2018   [Refereed]
©2018. American Geophysical Union. All Rights Reserved. We have analyzed the high-speed video of an upward negative leader that exhibited multiple branches. From the video, which was recorded at a frame rate of 300 kiloframes per second (3.3 μs pe...
D. M. Smith, G. S. Bowers, M. Kamogawa, D. Wang, T. Ushio, J. Ortberg, J. R. Dwyer, M. Stock
Journal of Geophysical Research: Atmospheres   123    Oct 2018   [Refereed]
©2018. American Geophysical Union. All Rights Reserved. We compare two observations of gamma rays before, during, and after lightning flashes initiated by upward leaders from a tower during low-altitude winter thunderstorms on the western coast of...
Shi Dongdong, Wang Daohong, Wu Ting, Thomas Ronald J., Edens Harald E., Rison William, Takagi Nobuyuki, Krehbiel Paul R.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES   123(17) 9430-9442   Sep 2018   [Refereed]
Wu Ting, Wang Daohong, Takagi Nobuyuki
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES   123(15) 7989-7998   Aug 2018   [Refereed]
Daohong Wang, Ting Wu, Nobuyuki Takagi
IEEJ. B      May 2018   [Refereed]
Wu Ting, Wang Daohong, Takagi Nobuyuki
GEOPHYSICAL RESEARCH LETTERS   45(8) 3698-3705   Apr 2018   [Refereed]
Zhou Mi, Wang Jianguo, Wang Daohong, Su Rui, Lu Yongyin
IEEE TRANSACTIONS ON MAGNETICS   54(3)    Mar 2018   [Refereed]
G. S. Bowers, D. M. Smith, G. F. Martinez-McKinney, M. Kamogawa, S. A. Cummer, J. R. Dwyer, D. Wang, M. Stock, Z. Kawasaki
Geophysical Research Letters   44    Oct 2017   [Refereed]
©2017. American Geophysical Union. All Rights Reserved. Following a lightning strike to a wind turbine in Japan, we have observed a large burst of neutrons lasting 100 ms with a ground fluence of ~1,000 n cm−2, thousands of times greater than the ...
Wu Ting, Wang Daohong, Rison William, Thomas Ronald J., Edens Harald E., Takagi Nobuyuki, Krehbiel Paul R.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES   122(9) 4849-4865   May 2017   [Refereed]
Weitao Lu, Yang Zhang, Luwen Chen, Enwei Zhou, Dong Zheng, Yijun Zhang, Daohong Wang
2010 30th International Conference on Lightning Protection, ICLP 2010      Feb 2017   [Refereed]
© 2010 University of Cagliari. A field observation experiment of lightning flashes occurring on high structures was conducted in the summer of 2009, at Guangzhou, Guangdong Province, China. Two downward negative lightning flashes, which stroke on...
Hazmi Ariadi, Emeraldi Primas, Hamid Muhammad Imran, Takagi Nobuyuki, Wang Daohong
ATMOSPHERE   8(1)    Jan 2017   [Refereed]
Light Intensity Profiles of Return Strokes at the Bottom of Rocket-triggered and Natural Lightning Channels
Naoki Tsukamoto, Ting Wu, Daohong Wang, Nobuyuki Takagi
37(1) 1-9   2017   [Refereed]
Lu Weitao, Qi Qi, Ma Ying, Chen Luwen, Yan Xu, Rakov Vladimir A., Wang Daohong, Zhang Yijun
HIGH VOLTAGE   1(1) 11-17   Apr 2016   [Refereed]
Ting Wu, Satoru Yoshida, Tomoo Ushio, Zen Kawasaki, Daohong Wang
Journal of Geophysical Research: Atmospheres   119(12) 7425-7438   Mar 2016   [Refereed]
Previous observations show that some narrow bipolar events (NBEs) can initiate intracloud discharges, but the role of NBE as lightning initiation is still unclear. During the summer of 2013, 827 NBEs were detected with a 3-D LF lightning location ...
Lightning Attachment Process Parameters Measured by Using LAPOS
2016 33RD INTERNATIONAL CONFERENCE ON LIGHTNING PROTECTION (ICLP)      2016   [Refereed]
Daohong Wang, Nobuyuki Takagi
2016 33RD INTERNATIONAL CONFERENCE ON LIGHTNING PROTECTION (ICLP)      2016   [Refereed]
Wang, D., N. Takagi, M. A. Uman, and D. M. Jordan
J. Geophys. Res. Atmos.   121 14612-14620   2016   [Refereed]
TAKAMATSU Kaneyoshi, TAKAGI Nobuyuki, WANG Daohong
J Atmos Electr   35(1) 17-30   Feb 2015   [Refereed]
Luwen Chen, Weitao Lu, Yijun Zhang, Daohong Wang
Journal of Geophysical Research Atmospheres   120(2) 708-715   Jan 2015   [Refereed]
©2015. American Geophysical Union. All Rights Reserved. Using high-speed cameras, Lightning Attachment Process Observation Systems, and fast and slow electrical antennas, we documented a downward bipolar lightning flash that contained one first po...
D. Wang, N. Takagi, W. R. Gamerota, M. A. Uman, D.M. Jordan
J. Geophys. Res. Atmos.   120    2015   [Refereed]
M. Zhou, D. Wang, J. Wang, N. Takagi, W. R. Gamerota, M. A. Uman, D. M. Jordan, J. T. Pilkey, T. Ngin
Journal of Geophysical Research   119    Dec 2014   [Refereed]
© 2014. American Geophysical Union. All rights reserved. The correlations between channel-bottom light intensity and channel-base current of all discharge processes of a rocket-and-wire-triggered lightning flash, including initial continuous curre...
Ting Wu, Satoru Yoshida, Tomoo Ushio, Zen Kawasaki, Daohong Wang
Journal of Geophysical Research   119 7425-7438   Jun 2014   [Refereed]
© 2014. American Geophysical Union. All Rights Reserved. Previous observations show that some narrow bipolar events (NBEs) can initiate intracloud discharges, but the role of NBE as lightning initiation is still unclear. During the summer of 2013,...
Ting Wu, Satoru Yoshida, Tomoo Ushio, Zen Kawasaki, Yuji Takayanagi, Daohong Wang
Journal of Geophysical Research   119 555-566   Jan 2014   [Refereed]
© 2014. American Geophysical Union. All Rights Reserved. Using a low-frequency lightning location system comprising nine stations, we have observed and analyzed 374 large and bipolar electric field change waveforms that occurred during the winter ...
D. Wang, N. Takagi, W. R. Gamerota, M. A. Uman, D. M. Jordan
2014 International Conference on Lightning Protection, ICLP 2014   112-115   Jan 2014   [Refereed]
© 2014 IEEE. We have studied the height-dependent attenuation characteristics of return stroke peak light intensities within the lowest tens of meters of the lightning channel. It was found that all return strokes follow a similar height-dependent...
D. Wang, W. R. Gamerota, M. A. Uman, N. Takagi, J. D. Hill, J. Pilkey, T. Ngin, D. M. Jordan, S. Mallick, and V. A. Rakov
J. Geophys. Res. Atmos.   119 1-10   2014   [Refereed]
Yuji Takayanagi, Manabu Akita, Yoshitaka Nakamura, Satoru Yoshida, Takeshi Morimoto, Tomoo Ushio, Zen Ichiro Kawasaki, Daohong Wang, Nobuyuki Takagi, Hitoshi Sakurano, Yoshiyuki Kubouchi
IEEJ Transactions on Fundamentals and Materials   133(3) 132-141   May 2013   [Refereed]
We have been designing and developing a 3-D lightning location system based on the broadband digital interferometry technique in LF bands. The LF broadband digital interferometer (LF DITF) consists of four or more LF receivers which detect electro...
Ariadi Hazmi, Zulka Hendri, Syaifa Mulyadi, Dasrinal Tesal, Daohong Wang, Nobuyuki Takagi
Proceedings - 2013 International Conference on Information Technology and Electrical Engineering: "Intelligent and Green Technologies for Sustainable Development", ICITEE 2013   322-325   Jan 2013   [Refereed]
Understanding the initiation process of preliminary breakdown during negative CG lightning discharges to the ground is important to design a lightning protection system. We observed electric field change preceding negative cloud to ground lightnin...
D. Wang, N. Takagi, W. R. Gamerota, M. A. Uman, J.D. Hill, D.M. Jordan,
Journal of Geophysical Research: Atmospheres   118(17) 9880-9888   2013   [Refereed]
Yajun Li, Guangshu Zhang, Jun Wen, Daohong Wang, Yanhui Wang, Tong Zhang, Xiangpeng Fan, Bin Wu
Atmospheric Research   134 137-149   2013   [Refereed]
An isolated thunderstorm that occurred on August 6, 2009, in Datong, Qinghai province, China, was studied using a three-dimensional (3D) lightning mapping system distributed at seven stations. This thunderstorm exhibited a dominant positive electr...
Daohong Wang, Nobuyuki Takagi
IEEJ Transactions on Power and Energy   132 568-572   Oct 2012   [Refereed]
We have observed lightning that struck a wind turbine and its neighboring lightning-protection tower during the past six winter seasons (2005 to 2010) using various lightning observation instruments. Our results show that the upward lightning from...
Yanhui Wang, Guangshu Zhang, Xiushu Qie, Daohong Wang, Tong Zhang, Yuxiang Zhao, Yajun Li, Tinglong Zhang
Journal of Atmospheric and Solar-Terrestrial Physics   84-85 7-14   Aug 2012   [Refereed]
A total of 236 Compact intracloud discharges (CIDs) are documented in this paper. Of between, 32 occurred in isolation and 204 occurred in association with either IC or CG lightning discharges. Among the latter, 130 appeared to initiate lightning ...
A single-station-based 3D lightning channel location system by using differential arrival time of thunder
H. Zhang,D.Wang, W.Lu, Y. Zhang, Q.Meng
Plateau Meteorology   31(1) 209-217   2012   [Refereed]
Daohong Wang, Tomohumi Watanabe, Nobuyuki Takagi
2011 7th Asia-Pacific International Conference on Lightning, APL2011   937-940   Dec 2011   [Refereed]
We have developed a high speed optical imaging system for studying lightning attachment process. The system has the feature of wide dynamic range, long recording length, high time resolution and data collection efficiency. We have installed three ...
Daohong Wang, Yashuhiro Inoue
PEAM 2011 - Proceedings: 2011 IEEE Power Engineering and Automation Conference   1 283-285   Dec 2011   [Refereed]
This paper has reported a system developed for continuously measuring PV maximum power point (MPP) at high speed. The preliminary results obtained with the system show that MPP power is directly proportional to the insolation, while MPP voltage do...
Nobuyuki Takagi, Daohong Wang
IEEJ Transactions on Power and Energy   131 532-535   Sep 2011   [Refereed]
We have obtained the electric current, electric field change, and optical image data or several tens of lightning that hit on a wind turbine and its lightning-protection tower during the past6 non-stop winter seasons from 2005 to 2010. By analyzin...
Manabu Akita, Manabu Akita, Satoru Yoshida, Yoshitaka Nakamura, Yoshitaka Nakamura, Takeshi Morimoto, Tomoo Ushio, Zen Kawasaki, Zen Kawasaki, Daohong Wang
Journal of the Atmospheric Sciences   68 719-726   Apr 2011   [Refereed]
The charge distributions in a thundercloud play an important role in the initiation and propagation of lightning discharges. To further understand the effects of charge distributions on lightning discharge, the authors conducted a very high-freque...
D. Wang, N. Takagi
Journal of Geophysical Research Atmospheres   116    Jan 2011   [Refereed]
Using a high-speed optical imaging system (Automatic Lightning Progressing Feature Observation System (ALPS)) operated at a time resolution of 100 ns, we recorded a downward positive leader that radiated more than 20 optical pulses during its down...
Daohong Wang, Nobuyuki Takagi, Yoshiki Takaki
2010 30th International Conference on Lightning Protection, ICLP 2010   1-4   Sep 2010   [Refereed]
© 2010 University of Cagliari. We have performed a detailed comparison between the self-triggered and the other-triggered upward lightning discharges in terms of their preceding electric fields, electric currents and charges transferred to the gro...
Daohong Wang, Weitao Lu, Yijun Zhang, Qing Meng, Yimin Chen, Yuchun Chang
2010 30th International Conference on Lightning Protection, ICLP 2010      Sep 2010   [Refereed]
© 2010 University of Cagliari. Two new methods for artificially triggering lightning discharges have been proposed. In the methods, a certain length of thin wire is extended by using relative motion of a parachute and a flying object at a timing c...
Daohong Wang
35TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE   2904-2907   2010   [Refereed]
A method for instantaneous measurement of PV V-I characteristic has been proposed. In the method, the PV electric load is instantaneously switched from open-circuit into short-circuit and then back into open-circuit with a semiconductor switch, an...
Manabu Akita, Yoshitaka Nakamura, Satoru Yoshida, Takeshi Morimoto, Tomoo Ushio, Zen Kawasaki, Daohong Wang
Journal of Geophysical Research Atmospheres   115    2010   [Refereed]
The Lightning Research Group of Osaka University has been developing and improving the VHF broadband digital interferometer, which locates the impulsive VHF radiation sources caused by lightning discharges with extremely high time resolution in th...
Manabu Akita, Satoru Yoshida, Yoshitaka Nakamura, Takeshi Morimoto, Tomoo Ushio, Zen Ichiro Kawasaki, Daohong Wang
IEEJ Transactions on Fundamentals and Materials   130 467-472   2010   [Refereed]
Lightning Research Group of Osaka University (LRG-OU) has been developing and improving the VHF broadband digital interferometer (DITF) for thunderstorm observations. It enables us to locate the impulsive VHF radiation sources caused by lightning ...
Evidence of negative leaders prior to fast rise ICC pulses of upward lightning
S. Yoshida, M. Akita, Y. Nakamura, T. Morimoto, T. Ushio, Z-I. Kawasaki, T. Torii, D. Wang, N. Takagi
J. Atmos. Electr.   13-21   2009   [Refereed]
W. Lu, W. Lu, D. Wang, D. Wang, Y. Zhang, Y. Zhang, N. Takagi, N. Takagi
Geophysical Research Letters   36    2009   [Refereed]
We have performed a study of two associated upward lightning flashes that involved two adjoining tall grounded objects with a time difference of about 45.8 ms. These two associated lightning are found to have opposite polarity, the first one being...
D.Wang, N.Takagi, T.Watanebe, H. Sakurano, M. Hashimoto
Geophysical Research Letters   35 1-5   Aug 2008   [Refereed]
We have analyzed the electric field changes of 14 upward leaders that were initiated from a windmill and its lightning protection tower. We found that these upward leaders can be sub-classified into two types according to whether they are triggere...
Lu Weitao(Gifu University),Wang Daohong(Gifu University)
Journal of Geophysical Research Atmospheres   113 1-8   Aug 2008   [Refereed]
A stepped leader that preceded a natural first return stroke was recorded using a high-speed optical imaging system with a time resolution of 0.1 μs and a spatial resolution of about 40 m. Within the view of the imaging system, 440 m × 480 m just ...
Satoru Yoshida, T. Morimoto, T. Ushio, Z. I. Kawasaki, T. Torii, D. Wang, N. Takagi, T. Watanabe
Geophysical Research Letters   35    May 2008   [Refereed]
We conducted a field campaign during the Japanese winter thunderstorm season to observe radiation bursts associated with lightning discharges using a NaI scintillator and a thin plastic scintillator (PS), which primarily detects high energy electr...
A discussion of traveling waves involved in the lightning return stroke process
D. Wang, V. Rakov, N. Takagi, T. Watanabe
J. Atmos. Electr.   28(2) 71-77   2008   [Refereed]
Discharge characteristics obtained with an impulse voltage simulating the lightning stepped leader
D. Matsui, A. Hazmi, T. Watanabe, N. Takagi, D. Wang
J. Atmos. Electr.   28(2) 63-69   2008   [Refereed]
Ariadi Hazmi, Nobuyuki Takagi, Daohong Wang, Teiji Watanabe
Sensors   7 3058-3070   Jan 2007   [Refereed]
A system for remotely measuring the distribution of air space charge in real time is developed. The system consists of a loudspeaker and an electric field antenna. By propagating a burst of directional sound wave from the speaker, a modulation in ...
Observed characteristics of luminous variation events during the initial stage of upward positive leaders
D. Wang, N. Takagi, T. Watanabe
J. Atmos. Electr.   27(1) 61-68   2007   [Refereed]
Observed characteristics of lightning occurred in Lhasa city, Tibet plateau region of China,
D. Wang, N. Takagi, T. Watanabe, Y. Tie, X. Qie, Y. Zhang
J. Atmos. Electr.   27(1) 61-68   2007   [Refereed]
A study of upward positive leaders based on simultaneous observation of E-fields and high-speed images
Takagi Nobuyuki(Gifu University),Wang Daohong(Gifu University),Watanabe Teiji(Gifu University)
256-259   Apr 2006
Wang Daohong(Gifu University),N. Takagi and T. Watanabe
Atmospheric Research   76 412-422   Jul 2005   [Refereed]
A comparative analysis has been performed of the channel-base current and light waveforms for four rocket-triggered lightning strokes. It has been found that the current and light signals at the bottom of the channel exhibit a linear relationship ...
RECENT PROGRESS IN THE STUDY OF LIGHTNING PROPAGATION CHARACTERISTICS BY USING ALPS
Wang Daohong(Gifu University)、N. Takagi and T. Watanabe
69-77   Jul 2005   [Refereed]
Miki M.(CRIPE),V. A. Rakov, T. Shindo, G. Diendorfer, M. Mair, F. Heidler, W. Zischank, M. A. Uman, R. Thottappillil,,Wang Daohong(Gifu University)
Journal of Geophysical Research D: Atmospheres   110 doi:10.1029-doi:10.1029   Jan 2005   [Refereed]
We examine the characteristics of the initial stage (IS) in object-initiated lightning derived from current measurements on the Gaisberg tower (100 m, Austria), the Peissenberg tower (160 m, Germany), and the Fukui chimney (200 m, Japan) and their...
D. Wang, N. Takagi, X. Liu, T. Watanabe, A. Chihara
Geophysical Research Letters   31(L02111) doi:10.1029-4ページ   Jan 2004   [Refereed]
Using a newly-developed high-speed digital optical system, we measured the luminosity profiles of four leader/return stroke sequences within a flash occurred on a high tower. By analyzing those profiles, we obtained two simple expressions to chara...
Takashi Yamada, Daiki Tokushima, Hiroki Ishikawa, Daohong Wang, Haruo Naitoh
IEEJ Transactions on Power and Energy   124 1087-1092   Jan 2004   [Refereed]
Generally, home PV systems use single-inverter systems as their power conditioners. However, single-inverter systems suffer limitations in terms of efficiency for the following two reasons: (1) PV arrays can not be operated simultaneously at maxim...
First report on the characteristics of lightning discharges occurred at Pampa La Bola with an altitude of 5000 m in Chile
T. Watanabe, N. Takagi, D. Wang, X. Liu, M.Kamata and S. Sakamoto
J. Atmos. Electr.   23(2) 69-75   2003   [Refereed]
Soft-switched Convertor
123(3) 881-882   2003   [Refereed]
Mingli Chen, Teiji Watanabe, Nobuyuki Takagi, Yaping Du, Daohong Wang, Xinsheng Liu
Journal of Geophysical Research D: Atmospheres   108    2003   [Refereed]
This paper presents an analysis of the experimental data on five negative lightning flashes initiated using the altitude-triggering technique in China. The data include highly time-resolved optical images and electric fields measured 60 m and 1300...
Xiushu Qie, Ye Yu, Daohong Wang, Huibin Wang, Rongzhong Chu
Journal of the Meteorological Society of Japan   80 745-754   2002   [Refereed]
Characteristics of cloud-to-ground (CG) lightning flashes in the Chinese inland plateau have been analyzed by using the data obtained from a broadband slow antenna system, with a time resolution of 1 microsecond in 1996, and a CG lightning locatio...
Xiushu Qie, Ye Yu, Xinsheng Liu, Guangshu Zhang, Daohong Wang, Teiji Watanabe, Nobuyuki Takagi, Tomo O. Ushio
Progress in Natural Science   10 610-611   Dec 2000
Some special features of lightning discharges in the eastern area of Qinghai-Tibetan Plateau have been investigated through multi-station measurements of wide-band slow antenna systems synchronized by Global Positioning System (GPS) with a time re...
H. Ishikawa, K. Atachi, D. Wang, M. Yoshida, T. Watanabe, S. Sugimoto
Proceedings - IPEMC 2000: 3rd International Power Electronics and Motion Control Conference   2 628-632   Jan 2000
© 2000 Int. Acad. Publ., World Publ. Corp. when a conventional high frequency IGBT-switched PWM inverter is used to drive motors with a long lead, one big concern is the voltage stress due to the surge voltage which may occur at motor terminal. Th...
X. Qie, Y. Yu, X. Liu, C. Guo, D. Wang, T. Watanabe, T. Ushio
Annales Geophysicae   18 1340-1348   Jan 2000   [Refereed]
Since the summer of 1996, scientists from China and Japan have conducted a joint observation of natural cloud-to-ground lightning discharges in the Zhongchuan area that is located close to Qinghai-Xizang (Tibet) Plateau, China. It has been found t...
Luminosity waves in branched channels of two negative lightning flashes
D.Wang, N.Takagi, T.Watanabe, V. Rakov, M. Uman
J. Atmos. Electr.   20(2) 91-97   2000   [Refereed]
Mingli Chen, Mingli Chen, Mingli Chen, Nobuyuki Takagi, Nobuyuki Takagi, Teiji Watanabe, Teiji Watanabe, Daohong Wang, Daohong Wang, Zen Ichiro Kawasaki, Zen Ichiro Kawasaki, Xinsheng Liu, Xinsheng Liu
Journal of Geophysical Research Atmospheres   104 27573-27584   Nov 1999   [Refereed]
The relative light intensities as a function of height and time for two negative downward stepped leaders, A and B, recorded by a high-speed digital 16 x 16 photodiode array photographic system, are studied. For leader A it is found that the light...
D. Wang, N. Takagi, T. Watanabe, V. A. Rakov, M. A. Uman
Journal of Geophysical Research Atmospheres   104 14369-14376   Jun 1999   [Refereed]
Using a high-speed digital optical system, we determined the propagation characteristics of two leader/return-stroke sequences in the bottom 400 m of the channel of two lightning flashes triggered at Camp Blanding, Florida. One sequence involved a...
D. Wang, D. Wang, V. A. Rakov, V. A. Rakov, M. A. Uman, M. A. Uman, N. Takagi, T. Watanabe, D. E. Crawford, D. E. Crawford, K. J. Rambo, K. J. Rambo, G. H. Schnetzer, G. H. Schnetzer, G. H. Schnetzer, R. J. Fisher, R. J. Fisher, R. J. Fisher, Z. I. Kawasaki
Journal of Geophysical Research Atmospheres   104 2143-2150   Jan 1999   [Refereed]
In order to study the lightning attachment process, we have obtained highly resolved (about 100 ns time resolution and about 3.6 m spatial resolution) optical images, electric field measurements, and channel-base current recordings for two dart le...
Characterization of the initial stage of negative rocket-triggered lightning
D.Wang, V.A.Rakov, M.A.Uman, M.I.Fernandez, K.J.Rambo, G.H.Schnetzer, R.J.Fisher
J. Geophys. Res.   4213-4222   1999   [Refereed]
N. Takagi, N. Takagi, D. Wang, D. Wang, T. Watanabe, T. Watanabe, I. Arima, T. Takeuchi, M. Simizu, Y. Katuragi, M. Yokoya, Y. Kawashima
Journal of Geophysical Research Atmospheres   103 14131-14134   Jan 1998
We developed a high-speed line-scanning camera (HSLSC) for measuring the radial variation of optical intensity of lightning channels. With this system we succeeded in obtaining a few examples of data for natural lightning. From these data we found...
Tomo O. Ushio, Tomo O. Ushio, Zen Ichiro Kawasaki, Zen Ichiro Kawasaki, Kenji Matsu-ura, Kenji Matsu-ura, Daohong Wang, Daohong Wang
Journal of Geophysical Research Atmospheres   103 14135-14139   Jan 1998   [Refereed]
Pulse trains superimposed on the initial part of the electric field change of positive ground flashes are investigated. The characteristics of these pulse trains are found to be different from those of negative ground flashes and cloud flashes. Ea...
Some results of investigation on slow front of return stroke electric waveform
M.Takeda, D.Wang, N.Takagi, T.Watanabe, M.Chen, T.Ushio, Z-I.Kawasaki, M.Nakano, N.Nakamura, X.Liu, X.Qie, C.Guo
J. Atmos. Electr.   118(1) 31-39   1998   [Refereed]
Initial process during one negative ground lightning discharge in Zhongchuan area
X.Qie, Y.Yu, G.Zhang, X.Liu, C.Guo, T.Watanabe, Z-I.Kawasaki, M.Nagano, K.Nakamura, D.Wang, T.Ushio
Plateau Meteorology   17(1) 34-43   1998   [Refereed]
Radiation electric field of return stroke and attachment process near the ground
X.Qie, C.Guo, G.Zhang, X.Liu, T.Watanabe, D.Wang, Z-I.Kawasaki, M.Nagano, K.Nakamura, T.Ushio
Plateau Meteorology   17(1) 44-54   1998   [Refereed]
A preliminary study on triggering lightning with transient flames
I.Yuge, T.Watanabe, N.Takagi, D.Wang, M.Chen, Z-I. Kawasaki, M.Oda,H.Takuma, Y.Minowa, J. Mitsutuji, T.Abe, T.Sato, Y.Sonoi
J. Atmos. Electr.   18(2) 125-130   1998   [Refereed]
Observation on Chinese Plateau Lightning
J. Atmos. Electr.   18(2) 139-154   1998   [Refereed]
UHF
J. Atmos. Electr.   18(2) 113-128   1997   [Refereed]
D. Wang, T. Ushio, Z. I. Kawasaki, K. Matsuura, Y. Shimada, S. Uchida, C. Yamanaka, Y. Izawa, Y. Sonoi, N. Simokura
Journal of Atmospheric and Terrestrial Physics   57 459-466   Jan 1995   [Refereed]
To study the possibility of triggering lightning with a laser plasma, laboratory laser-induced discharge experiments have been carried out and the following results were obtained. Both long straight and zigzag laser induced discharges between rod-...
Luminous propagation of lightning attachment to CN tower
D.Wang, Z-I.Kawasaki, K. Yamamoto, K.Matsuura, J.Chang, and W.Janischewskyj
J. Geophys. Res.      1995   [Refereed]
Progression of leader system in long gap laser triggered discharges
D.Wang, N.Takagi, T.Watanabe, T.Ushio, Z-I. Kawasaki, K. Matsuura, Y.Shimada, S.Uchida, C.Yamanaka
J. Atmos. Electr.      1995   [Refereed]
Experiment of artificially triggering lightning in China
X.Liu, C.Wang, Y.Zhang, Q.Xiao, D.Wang, C.Guo
J. Geophys. Res.   10727-10732   1994   [Refereed]
The study of the possibility of lightning triggered by means of a laser
D.Wang, T.Ushio, Z-I.Kawasaki, K.Matsuura, Y.Shimada, S.Uchida, C.Yamanaka, Y.Izawa, Y.Sonoi, N.Simokura
J. Atmos. Electr.      1994   [Refereed]
A preliminary study on laser triggered lightning
D.Wang, Z-I.Kawasaki, K.Matsuura, Y.Shimada, S.Uchida, C.Yamanaka, E.Fujiwara, Y.Izawa, Y.Sonoi, N.Simokura
J. Geophys. Res.      1994   [Refereed]
A preliminary analysis of the characteristics of ground discharges in thunderstorms near Zhongchuan, Gansu Province
D. Wang, X.Liu, C. Wang
Plateau Meteorology   9(4) 405-410   1990   [Refereed]
The criterion for propagation of the positive streamer and its application
D. Wang, C. Guo
J. Acta Meteorol. Sinica   3(1) 64-75   1989   [Refereed]

Misc

 
Jinliang He, Vladimir Rakov, Daohong Wang, Pao K. Wang
Atmospheric Research   129-130 33   Jul 2013
X. Qie, X. Liu, Y. Yu, C. Zhang, C. Guo, D. Wang, T. Watanabe, N. Takagi, Z. Kawasaki, T. Ushio, M. Nakano, K. Nakamura
SAE Technical Papers      Dec 1999
Some special features of cloud-to-ground (CG) lightning discharges in the verge of Qinghai-Tibetan Plateau have been found by using the data from wide-band slow antenna system with 1μs time resolution. It has been found that (CG) lightning usually...
Shigeaki Uchida, Yoshinori Shimada, Hirohiko Yasuda, Chiyoe Yamanaka, Zen ichiro Kawasaki, Hisanori Fujita, Tatsuhiko Yamanaka, Sadao Nakai, Daohong Wang, Kenshi Matsu-ura, Yuji Ishikubo, Mikio Adachi
Proceedings of SPIE - The International Society for Optical Engineering   2506 636-645   Dec 1995
A series of laboratory experiments has been conducted to investigate the initiating and guiding effects of laser plasma channel on electrical discharge. It was confirmed that the plasma channels have strong guiding effects and reduce the required ...
Y. Shimada, H. Yasuda, S. Uchida, C. Yamanaka, Y. Izawa, T. Yamanaka, S. Nakai, D. Wang, T. Ushio, Z. I. Kawasaki, K. Matsuura, N. Shimokura, Y. Sonoi, T. Nagai, T. Matsui
IEEE International Symposium on Electromagnetic Compatibility   72-75   Dec 1994
A focusing optics and critical conditions for artificially triggered lightning will be discussed. An Infinite-MACH (Multi Active CHannel) mirror (I-MACH) has been developed and shown to be effective to produce a long plasma channel. A Cassegrain t...
S. Uchida, Y. Shimada, H. Yasuda, C. Yamanaka, D. Wang, Z. I. Kawasaki, K. Matsu-ura, H. Fujita, Y. Izawa, T. Yamanaka, Y. Ishikubo, N. Shimokura
Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting   8 209-210   Jan 1994
Air breakdown plasma channel produced by focusing an intense laser light is used to trigger lightning. Presented is a laser-triggered lightning field experiment consisting of a CO2 laser system and a lightning tower. The laser system delivers ener...

Conference Activities & Talks

 
What have we learned about the lightning discharge in the last 100 years [Invited]
WANG Daohong
27th International Union of Geodesy and Geophysics General Assembly   Jul 2019   
Lightning Attachment Process [Invited]
WANG Daohong
22nd International Lightning Detection Conference   2014   
A review and an update on the winter lightning that occurred on a rotating windmill and its stand-alone lightning protection tower [Invited]
WANG Daohong
American Geophysical Union 2012 fall meeting   2012   
Novel methods for artificial triggering of lightning discharges and their possible applications [Invited]
WANG Daohong
China international forum on lightning protection and disaster mitigation   2009   

Research Grants & Projects

 
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(B))
Project Year: 2005 - 2007    Investigator(s): 渡邉 貞司, Daohong WANG
Lightning to a windmill and its lightning-protection tower was observed in 2005, 2006 and 2007 winter seasons. All lightning recorded are upward lightning and they can be sub-classified into two types according to whether or not their initial upwa...
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(B))
Project Year: 2005 - 2006    Investigator(s): Daohong WANG
We have performed a lightning observation campaign in Lhasa city, Tibet plateau region of China in the summers of 2005 and 2006. We found1. Almost all Tibetan lightning occurred from late after noon to mid night. Thunderstorms differ greatly in li...
Japan Society for the Promotion of Science: Grants-in-Aid for Scientific Research
Project Year: 2011 - 2014
Japan Society for the Promotion of Science: Grants-in-Aid for Scientific Research
Project Year: 2011 - 2014