OKUBO Masaaki

J-GLOBAL         Last updated: Nov 28, 2019 at 01:09
 
Avatar
Name
OKUBO Masaaki
Nickname
handle0180704
E-mail
mokubome.osakafu-u.ac.jp
Affiliation
Osaka Prefecture University
Section
Graduate School of Engineering, Division of Mechanical Engineering
Job title
Professor,Professor
Degree
Dr. Eng.(Tokyo Institute of Technology)
Research funding number
40223763
ORCID ID
0000-0003-1321-916X

Profile

My research field is plasma application to industries, especially applications to global environmental protection. In my research field, recently we write a book entitled "New Technologies for Emission Control in Marine Diesel Engines" which was published by Elsevier. Please read or introduce this book to students who are studying marine engineering as well as mechanical and electrical engineering.

Research Areas

 

Academic & Professional Experience

 
Apr 2007
 - 
Today
Professor, Department of Mechanical Engineering, Osaka Prefecture University
 
Oct 1998
 - 
Mar 2006
Associate Professor, Department of Mechanical Engineering, Osaka Prefecture University
 
Apr 1994
 - 
Oct 1998
Assistant Professor, Research Laboratory for Nuclear Reactor, Tokyo Institute of Technology
 
Apr 1990
 - 
Mar 1993
Assistant Professor Institute of Fluid Science, Tohoku University
 

Education

 
Apr 1987
 - 
Mar 1990
Ph.D. Course, Department of Mechanical Engineering, Graduate School of Science and Engineering, Tokyo Institute of Technology
 
 
 - 
1990
Graduate School, Division of Science and Engineering, Tokyo Institute of Technology
 
Apr 1985
 - 
Mar 1987
Master Course, Department of Mechanical Engineering, Graduate School of Science and Engineering, Tokyo Institute of Technology
 
Apr 1981
 - 
Mar 1985
Undergraduate Course, Department of Mechanical Engineering, Faculty of Engineering, Tokyo Institute of Technology
 

Published Papers

 
Tomoyuki Kuroki, Kiyoyuki Hirai, Shigeru Matsuoka, Jong Youl Kim, Masaaki Okubo
IEEE Transactions on Industry Applications   55 3122-3128   May 2019
© 1972-2012 IEEE. Toluene decomposition is performed using an adsorbent and a nonthermal plasma (NTP) induced radical flow system that consists of a surface discharge and circulation flow. The liquid toluene is vaporized in the circulation channel...
Keita Hori, Syunsuke Fujimoto, Yudai Togashi, Tomoyuki Kuroki, Masaaki Okubo
IEEE Transactions on Industry Applications   55 825-832   Jan 2019
© 1972-2012 IEEE. Atmospheric pressure plasma graft polymerization-treated fluorocarbon plastics are bonded with a metal, to evaluate adhesiveness. In this research, the atmospheric nonthermal plasma graft polymerization technique is used in treat...
Haruhiko Yamasaki, Yuki Koizumi, Tomoyuki Kuroki, Masaaki Okubo
Energies   12    Jan 2019
© 2019 by the authors. NOx is emitted in the flue gas from semiconductor manufacturing plants as a byproduct of combustion for abatement of perfluorinated compounds. In order to treat NOx emission, a combined process consisting of a dry plasma pro...
Masaaki Okubo, Kazuya Takahashi, Shuhei Kamiya, Tomoyuki Kuroki
IEEE Transactions on Industry Applications   54 6422-6429   Nov 2018
© 1972-2012 IEEE. We present a highly efficient carbon dioxide (CO2) reduction treatment technique using an adsorbent and nonthermal plasma flow at the laboratory scale. The plasma reactor consists of twelve surface discharge elements, which are e...
Kotaro Takehana, Tomoyuki Kuroki, Masaaki Okubo
Journal of Physics D: Applied Physics   51    Apr 2018
© 2018 IOP Publishing Ltd. Nitrogen oxides (NOx) emitted from power plants and combustion sources cause air pollution problems. Selective catalytic reduction technology is remarkably useful for NOx removal. However, there are several drawbacks suc...
Tomoyuki Kuroki, Toshiaki Yamamoto, Shunsuke Nishii, Masayuki Akita, Masaaki Okubo
IEEE Transactions on Industry Applications   53 5852-5858   Nov 2017
© 1972-2012 IEEE. Nitrous oxide (N2O) is commonly used as an anesthetic gas in hospitals. It is a greenhouse gas and should therefore be removed to limit pollution. As nonthermal plasma has low electron density, it has been considered effective fo...
Masaaki Okubo, Hideaki Yamada, Keiichiro Yoshida, Tomoyuki Kuroki
IEEE Transactions on Industry Applications   53 5875-5882   Nov 2017
© 2017 IEEE. Particulate matter (PM) and NOx emitted from diesel engines is simultaneously reduced by a barrier-type catalyst-packed nonthermal plasma (NTP) application, driven by a pulse high-voltage power supply under oxygen-lean conditions. Cat...
Tomoyuki Kuroki, Shunsuke Nishii, Takuya Kuwahara, Masaaki Okubo
Journal of Electrostatics   87 86-92   Jun 2017
© 2017 Elsevier B.V. We investigate the removal of air pollutants containing nanoparticles with a wet-type plasma reactor that generates a gas-liquid interfacial nonthermal plasma. To evaluate the performance of this reactor, we prepare a simulate...
Masaaki Okubo, Tomoyuki Kuroki, Hideaki Yamada, Keiichiro Yoshida, Takuya Kuwahara
IEEE Transactions on Industry Applications   53 2432-2439   May 2017
© 2017 IEEE. Air-pollutant and greenhouse gas emissions typically have high gas flow rates and low concentrations (in ppm ∼ % levels, 1% = 10 000 ppm). The bulky equipment required for direct treatment of high-flow-rate low-concentration exhaust g...
Hashira Yamamoto, Tomoyuki Kuroki, Hidekatsu Fujishima, Yuri Yamamoto, Kouta Yoshida, Masaaki Okubo
IEEE Transactions on Industry Applications   53 1416-1423   Mar 2017
© 1972-2012 IEEE. A pilot-scale simultaneous removal of NOx and SOx, as a nonthermal plasma and chemical hybrid process (PCHP), is carried out on combustion exhaust gas in a glass manufacturing system. The PCHP is implemented in an actual semi-dry...
T. Kuroki, M. Tanaka, M. Okubo
International Journal of Plasma Environmental Science and Technology   11 92-97   Jan 2017
The effect of water spray on the oxidative decomposition of adsorbed toluene by nonthermal plasma flow is investigated. By spraying water upstream of the adsorbent, OH radicals are generated around the adsorbent, and the decomposition of adsorbed ...
Masaaki Okubo, Takeshi Onji, Tomoyuki Kuroki, Hiroaki Nakano, Eiji Yao, Mitsuru Tahara
Plasma Chemistry and Plasma Processing   36 1431-1448   Nov 2016
© 2016, Springer Science+Business Media New York. Extremely strong reinforced adhesion between a polytetrafluoroethylene (PTFE) film and butyl rubber is achieved using an atmospheric pressure plasma graft polymerization, involving argon and acryli...
Takuya Kuwahara, Harunobu Nakaguchi, Tomoyuki Kuroki, Masaaki Okubo
Journal of Hazardous Materials   308 216-224   May 2016
© 2016. Considering the recent stringent regulations governing diesel NOx emission, an aftertreatment system for the reduction of NOx in the exhaust gas has been proposed and studied. The proposed system is a hybrid method combining nonthermal pla...
Yuri Yamamoto, Hashira Yamamoto, Daichi Takada, Tomoyuki Kuroki, Hidekatsu Fujishima, Masaaki Okubo
Ozone: Science and Engineering   38 211-218   May 2016
© 2016 International Ozone Association. In this study, we propose a plasma-chemical hybrid NOx removal process using nonthermal plasma for the treatment of flue gases emitted from glass melting furnaces; the process is demonstrated through a labor...
Tomoyuki Kuroki, Toshiaki Yamamoto, Shunsuke Nishii, Masayuki Akita, Masaaki Okubo
IEEE Industry Application Society - 51st Annual Meeting, IAS 2015, Conference Record      Dec 2015
© 2015 IEEE. Nitrous oxide (N2O), which has been used as an anesthetic gas in hospitals, is one of greenhouse gases and it should be removed. Nonthermal plasma is considered to be useful for low concentration gas treatment due to low electron dens...
M. Okubo
Physics of Plasmas   22    Dec 2015
© 2015 AIP Publishing LLC. Nonthermal plasmas (NTPs) induced by atmospheric nanosecond pulsed corona discharge have been studied for controlling pollution from combustors, such as boilers, incinerators, and diesel engines. In high-speed short-widt...
Tomoyuki Kuroki, Ken Nakayama, Daisuke Nakamura, Takeshi Onji, Masaaki Okubo
IEEE Transactions on Industry Applications   51 2497-2503   May 2015
© 1972-2012 IEEE. In this paper, organic electroluminescence fluoropolymer film devices, i.e., organic light-emitting diodes (OLEDs) comprising polychlorotrifluoroethylene (PCTFE) films treated by an atmospheric-pressure nonthermal plasma (NTP) gr...
Takuya Kuwahara, Keiichiro Yoshida, Kenichi Hanamoto, Kazutoshi Sato, Tomoyuki Kuroki, Masaaki Okubo
IEEE Transactions on Industry Applications   51 1168-1178   Mar 2015
© 1972-2012 IEEE. Due to the fact that it is difficult to fulfill the recent stringent regulations governing marine diesel engine emission by means of combustion improvement alone, an effective aftertreatment technology is required to achieve the ...
Takuya Kuwahara, Keiichiro Yoshida, Kenichi Hanamoto, Kazutoshi Sato, Tomoyuki Kuroki, Masaaki Okubo
Ozone: Science and Engineering   37 518-526   Jan 2015
© 2015 International Ozone Association. Because the regulations governing diesel engine emissions are becoming more stringent, effective aftertreatment is needed for particulate matter. Although diesel particulate filters (DPFs) are a leading tech...
Takuya Kuwahara, Keiichiro Yoshida, Tomoyuki Kuroki, Kenichi Hanamoto, Kazutoshi Sato, Masaaki Okubo
Plasma Chemistry and Plasma Processing   34 65-81   Jan 2014
Regulations governing marine diesel engine NOx emissions have recently become more stringent. As it is difficult to fulfill these requirements by combustion improvements alone, effective aftertreatment technologies are needed to achieve efficient ...
Tomoyuki Kuroki, Mitsuru Tahara, Takuya Kuwahara, Masaaki Okubo
IEEE Transactions on Industry Applications   50 45-50   Jan 2014
Microfabrication by photolithography and nickel plating of fluoropolymer film, exposed to atmospheric-pressure nonthermal-plasma (NTP) graft polymerization, are investigated. Electroless nickel plating on the NTP-graft-polymerizationtreated polyte...
Mitsuru Tahara, Masaaki Okubo
Journal of Electrostatics   72 222-227   Jan 2014
The detection of free radicals such as hydroxyl radical and hydrogen radical for plasma in solution induced by a pulsed electrohydraulic discharge are successfully performed using electron spin resonance measurement. The plasma reactor is a barrie...
Hidekatsu Fujishima, Y. Fukumoto, T. Kuroki, A. Tanaka, K. Otsuka, M. Okubo
International Journal of Plasma Environmental Science and Technology   8 45-51   Jan 2014
A low-emission boiler system that consists of a multi-fuel boiler for hot water or steam supply and a plasma-chemical hybrid NOx removal apparatus is demonstrated. The boiler has a 2.5 t/h steam generation rate. Many experiments are conducted usin...
大久保 雅章, 桑原 拓也, 黒木 智之
静電気学会誌   37(6) 256-261   Nov 2013
Keiichiro Yoshida, Takuya Kuwahara, Tomoyuki Kuroki, Masaaki Okubo
Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   79(801) 786-790   Jul 2013
Nitrogen monoxide (NO) was injected into a stationary diesel engine generator (rating load: 2 kW) at high flow rates much larger than those achieved in the exhaust gas recirculation (EGR), and the influence of the injection was investigated with a...
Takuya Kuwahara, Masafumi Nishimoto, Keiichiro Yoshida, Tomoyuki Kuroki, Masaaki Okubo
Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   79(800) 723-727   May 2013
Regulations governing diesel engine emissions have become more stringent from the viewpoint of environmental considerations and cannot be fulfilled simply by improving combustion efficiency. For removing diesel particulate matter (PM) from diesel ...
OKUBO Masaaki, FUJISHIMA Hidekatsu, OTSUKA Keiichi
プラズマ・核融合学会誌 = Journal of plasma and fusion research   89(3) 152-157   Mar 2013
燃焼機器排ガスの大気圧プラズマによる後処理に関しては,これまで多くの研究がなされてきたが,後処理にプラズマを単独で使用することは,大量の電力を要し実用的でなく,他の技術を組み合わせた複合的処理が必須である.一方,火力発電所や産業用燃焼機器に対し後処理装置の完備していない新興国では,先進国のそれら施設で通常使用されているSCR(選択触媒還元法)や湿式石灰石膏法の代替となる低コストなプラズマ複合処理が注目を集めている.さらにはハイブリッドエンジンに代表される電気エネルギーの利用性向上や燃焼効率...
OKUBO Masaaki
プラズマ・核融合学会誌 = Journal of plasma and fusion research   89(3) 137-138   Mar 2013
Keiichiro Yoshida, Takuya Kuwahara, Tomoyuki Kuroki, Masaaki Okubo
Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)   182 39-47   Feb 2013
The effect of injecting NO (major content of NOx in diesel exhaust gas) into a diesel engine intake, on the reduction of NOx generation at the combustion chamber was investigated. The results demonstrate that 20 to 30% of the injected NO [0.225 to...
Tomoyuki Kuroki, Tuyoshi Oishi, Toshiaki Yamamoto, Masaaki Okubo
IEEE Transactions on Industry Applications   49 293-297   Jan 2013
The decomposition of bromomethane (\hbox{CH}-{3}\hbox{Br}) , which is an ozone-depleting substance, is carried out using a pulsed dielectric barrier discharge. To accomplish this, a plasma reactor comprising a stainless discharge wire electrode an...
Hideki Kido, Tomoyuki Kuroki, Masaaki Okubo, Yuichi Utsumi
Microsystem Technologies   19 301-307   Jan 2013
Polytetrafluoroethylene (PTFE) microstructures' processing characteristics using X-ray photo decomposition and desorption are studied in the highest energy region (2-12 keV). While the exposed surface states are seen melting and boiling from the r...
Hidekatsu Fujishima, Kenichi Takekoshi, Tomoyuki Kuroki, Atsushi Tanaka, Keiichi Otsuka, Masaaki Okubo
Applied Energy   111 394-400   Jan 2013
A super-clean boiler system comprising a multi-fuel boiler and a reactor for plasma-chemical hybrid NOx aftertreatment is developed, and its industrial applications are examined. The purpose of this research is to optimally reduce NOx emission and...
T. Kuwahara, S. Nishii, T. Kuroki, M. Okubo
Applied Energy   111 652-656   Jan 2013
The regeneration of diesel particulate filters (DPFs) is a subject that has attracted considerable interest. Although the ozone injection method is effective, it is unclear whether it can be used to achieve complete DPF regeneration. From the appl...
OKUBO Masaaki
Journal of The Surface Finishing Society of Japan   63(12) 759-763   Dec 2012
Takuya Kuwahara, Tomoyuki Kuroki, Keiichiro Yoshida, Noboru Saeki, Masaaki Okubo
Thin Solid Films   523 2-5   Nov 2012
An innovative sterilization system that uses an air plasma jet induced by an atmospheric pressure corona discharge is developed. Because the sterilization is performed by the plasma reactions of air, the system does not require any preparation of ...
Takuya Kuwahara, Keiichiro Yoshida, Kenichi Hanamoto, Kazutoshi Sato, Tomoyuki Kuroki, Toshiaki Yamamoto, Masaaki Okubo
IEEE Transactions on Industry Applications   48 1649-1656   Sep 2012
As the regulations governing diesel engine emissions have become more stringent, it has become difficult to fulfill these new requirements by only using techniques that improve combustion. Therefore, more effective aftertreatment technology is nee...
Keiichiro Yoshida, Takuya Kuwahara, Tomoyuki Kuroki, Masaaki Okubo
Journal of Hazardous Materials   231-232 18-25   Sep 2012
NOx emitted from a stationary diesel engine generator was treated with a hybrid system comprising NOx reduction by nonthermal plasma (NTP) and temperature swing adsorption (TSA) driven by engine waste heat. TSA produces a low-volume gas mixture of...
Zongbao Feng, Noboru Saeki, Tomoyuki Kuroki, Mitsuru Tahara, Masaaki Okubo
Applied Physics Letters   101    Jul 2012
The authors report on the introduction of a magnetic field to gliding arc discharge (GD) in order to enhance surface modification by nonthermal plasma at atmospheric-pressure. The GD is induced between two wire electrodes by using a pulse high-vol...
大久保 雅章, 桑原 拓也, 吉田 恵一郎
伝熱   51(216) 55-63   Jul 2012
KUWAHARA Takuya, NISHIMOTO Masafumi, YOSHIDA Keiichiro, KUROKI Tomoyuki, OKUBO Masaaki
日本AEM学会誌 = Journal of the Japan Society of Applied Electromagnetics   20(1) 21-27   Mar 2012
KUWAHARA Takuya, KUROKI Tomoyuki
TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B   78(789) 1029-1033   2012
The authors realize a new prototype of plasma-assisted environmental protection aftertreatment system using atmospheric-pressure nonthermal plasma combine processes for super clean diesel engines. This system does not use any rare or precious meta...
KUROKI Tomoyuki, FUJISHIMA Hidekatsu, OKUBO Masaaki, OTSUKA Keiichi
ボイラ研究   (370) 21-27   Dec 2011
YOSHIDA Keiichiro, KUWAHARA Takuya, KUROKI Tomoyuki, OKUBO Masaaki
IEEJ Transactions on Electronics, Information and Systems   131(11) 1933-1939   Nov 2011
The authors inject NO into a diesel engine intake and investigate the reduction of NOx generation at the combustion chamber at first. The result shows that 20 - 30% of the injected NO (0.225 ∼ 0.72 slm) is reduced. Discussion through the calcu...
Zongbao Feng, Noboru Saeki, Tomoyuki Kuroki, Mitsuru Tahara, Masaaki Okubo
IEEE Transactions on Plasma Science   39 2846-2847   Nov 2011
This paper presents a novel design for a gliding arc plasma generator assisted by a magnetic field for surface modification. The introduction of the magnetic field enhances the motion and reach of the gliding arc discharge. As a result, a 19-cm-lo...
Takuya Kuwahara, Keiichiro Yoshida, Youhei Kannaka, Tomoyuki Kuroki, Masaaki Okubo
IEEE Transactions on Industry Applications   47 2359-2366   Nov 2011
Atmospheric-pressure nonequilibrium nonthermal plasma hybrid exhaust gas aftertreatment systems that do not utilize precious metal catalysts, harmful ammonia, etc., have been developed by the authors. Two types of new environmental protection syst...
Tatsuji Aoi, Tomoyuki Kuroki, Mitsuru Tahara, Masaaki Okubo
IEEJ Transactions on Fundamentals and Materials   131 412-413   Sep 2011
The atmospheric pressure nonthermal plasma-graft polymerization treatment is applied for the surface modification of the organic fibers in order to enhance the strength of the aerospace structural composite material consisting of the laminated tex...
Hidekatsu Fujishima, Yusuke Yoshioka, Tomoyuki Kuroki, Atsushi Tanaka, Keiichi Otsuka, Masaaki Okubo
IEEE Transactions on Industry Applications   47 2210-2217   Sep 2011
A pilot-scale low-emission boiler system consisting of a bio-fuel boiler and a plasma-chemical hybrid NOx removal system is investigated. This system can achieve carbon neutrality because the bio-fuel boiler uses waste vegetable oil (WVO) as one o...
Masaaki Okubo, Tomoyuki Kuroki, Noboru Saeki
Thin Solid Films   519 6994-6998   Aug 2011
Polymer filters treated by plasma-assisted graft polymerization (PG), nonthermal plasma (NTP) and PG followed by NTP treatment are developed for use as multifunctional filters that can simultaneously remove odor and particulate. A NTP-treated filt...
Tomoyuki Kuroki, Kiyoyuki Hirai, Shigeru Matsuoka, Jong Youl Kim, Masaaki Okubo
IEEE Transactions on Industry Applications   47 1916-1921   Jul 2011
A toluene oxidation system is developed using an adsorbent and a nonthermal plasma (NTP) flow that consists of a surface discharge and a circulation flow. The liquid toluene is vaporized in the circulation line connected with a blower, the adsorbe...
Takuya Kuwahara, Masaaki Okubo, Tomoyuki Kuroki, Hideya Kametaka, Toshiaki Yamamoto
Sensors   11 5529-5542   Jun 2011
Odor control has gained importance for ensuring a comfortable living environment. In this paper, the authors report the experimental results of a study on the detailed characteristics of a laminated film-electrode and a laminated film-electrode pa...
AOI Tatsuji, KUROKI Tomoyuki, TAHARA Mitsuru, OKUBO Masaaki
IEEJ Transactions on Fundamentals and Materials   131(5) 412-413   May 2011
The atmospheric pressure nonthermal plasma-graft polymerization treatment is applied for the surface modification of the organic fibers in order to enhance the strength of the aerospace structural composite material consisting of the laminated tex...
Keiichiro Yoshida, Takuya Kuwahara, Tomoyuki Kuroki, Masaaki Okubo
IEEJ Transactions on Electronics, Information and Systems   131 1933-1939   Jan 2011
The authors inject NO into a diesel engine intake and investigate the reduction of NOx generation at the combustion chamber at first. The result shows that 20-30% of the injected NO (0.225 ∼ 0.72 slm) is reduced. Discussion through the calculation...
Adrian Mihalcioiu, Keiichiro Yoshida, Masaaki Okubo, Tomoyuki Kuroki, Toshiaki Yamamoto
IEEE Transactions on Industry Applications   46 2151-2156   Nov 2010
The aim of this paper is to analyze the influence of plasma discharge reactor unit geometries on the efficiency of dry NOx reduction process in nitrogen plasma environments. The experimental setup consists of the versatile plasma discharge reactor...
Masaaki Okubo, Tomoyuki Kuroki, Keiichiro Yoshida, Toshiaki Yamamoto
IEEE Transactions on Industry Applications   46 2143-2150   Nov 2010
A simultaneous reduction of particulate matter (PM) and NOx emitted from diesel engines has been realized by means of a barrier-type packed-bed nonthermal plasma (NTP) application driven by a pulse high-voltage power supply under oxygen-lean condi...
KUROKI Tomoyuki, FUJISHIMA Hidekatsu, OKUBO Masaaki
IEEJ Transactions on Fundamentals and Materials   130(10) 885-891   Oct 2010
Operation tests of the smoke-tube boiler emission NOx treatment plant which consists of a plasma ozonizer using a pressure swing adsorption (PSA) oxygen generator and silent discharge for indirect NO oxidation and a Na2SO3 ch...
Hidekatsu Fujishima, Atsuyoshi Tatsumi, Tomoyuki Kuroki, Atsushi Tanaka, Keiichi Otsuka, Toshiaki Yamamoto, Masaaki Okubo
IEEE Transactions on Industry Applications   46 1722-1729   Sep 2010
NOx removal from the flue gas of a smoke tube boiler using an ozonizer for NO oxidation and a Na2SO3 aqueous solution scrubber (diameter: 0.6 m; height: 3.7 m) was investigated. In this paper, in order to determine the correlation NOx removal perf...
Masaaki Okubo, Mitsuru Tahara, Yasushi Aburatani, Tomoyuki Kuroki, Toshitomo Hibino
IEEE Transactions on Industry Applications   46 1715-1721   Sep 2010
A surface modification technique that improves the adhesion of fluorocarbon polymer films such as polytetrafluoroethylene (PTFE), perfluoroalkoxy fluoroplastics, and polychlorotrifluoroethylene is developed using argon at atmospheric pressure and ...
Hidekatsu Fujishima, Tomoyuki Kuroki, Tomohiro Ito, Keiichi Otsuka, Toshiaki Yamamoto, Keiichiro Yoshida, Masaaki Okubo
IEEE Transactions on Industry Applications   46 1707-1714   Sep 2010
The process of removing NOx from the flue gas emitted from a smoke-tube boiler was investigated using an ozonizer, which is used for carrying out the indirect oxidation of NO, and a Na2SO3 chemical scrubber. The flow rate of the flue gas was in th...
Yuichi Utsumi, Shigeaki Yamamoto, Tomoyuki Kuroki, Masaaki Okubo
Microsystem Technologies   16 1495-1500   Aug 2010
Characteristics of the microfabrication and modification of polytetrafluoroethylene (PTFE) using X-ray photo decomposition desorption and ablation are studied in the highest energy region (2 keV to over 12 keV). We have discussed that the PTFE pol...
OKUBO Masaaki, TAHARA Mitsuru
Journal of The Adhesion Society of Japan   46(3) 116-121   Mar 2010
Tomoyuki Kuroki, Kiyoyuki Hirai, Ryouhei Kawabata, Masaaki Okubo, Toshiaki Yamamoto
IEEE Transactions on Industry Applications   46 672-679   Mar 2010
A xylene decomposition system that combines a process of adsorption with a process of decomposition by nonthermal plasma with gas circulation is investigated for treating volatile organic compounds exhaust from indoor small-scale sources. An ac 60...
Tomoyuki Kuroki, Motoki Ishidate, Masaaki Okubo, Toshiaki Yamamoto
Carbon   48 184-190   Jan 2010
The electric charge of diesel particulate matter (DPM) from a corona discharge device is measured for understanding the electrical characteristics of the DPM; an electrostatic precipitator (ESP) is employed for trapping DPM. Exhaust gas from a die...
Toshiaki Yamamoto, Hidekatsu Fujishima, Masaaki Okubo, Tomoyuki Kuroki
IEEE Transactions on Industry Applications   46 29-37   Jan 2010
Pilot-scale simultaneous NOx and SOx removal from boiler emission was performed using an indirect-plasma and chemical hybrid process. The flue-gas flow rate was in the range of 450-1470 Nm3/h, the gas temperature was 280°C, the NOx concentration w...
Tomoyuki Kuroki, Hidekatsu Fujishima, Masaaki Okubo
IEEJ Transactions on Fundamentals and Materials   130 885-891   Jan 2010
Operation tests of the smoke-tube boiler emission NOx treatment plant which consists of a plasma ozonizer using a pressure swing adsorption (PSA) oxygen generator and silent discharge for indirect NO oxidation and a Na 2SO3 chemical scrubber are c...
Keiichiro Yoshida, Tomoyuki Kuroki, Masaaki Okubo
Thin Solid Films   518 987-992   Dec 2009
A NOx aftertreatment system, using nonthermal plasma (NTP) reduction and exhaust gas components' recirculation, is investigated. A pilot-scale system is applied to a stationary diesel engine. In this system, NOx is first removed by adsorption, and...
Masaaki Okubo, Tomoyuki Kuroki, Shenpei Kawasaki, Keiichiro Yoshida, Toshiaki Yamamoto
IEEE Transactions on Industry Applications   45 1568-1574   Oct 2009
Every year, stricter regulations are imposed on diesel engine emissions. It is difficult to satisfy these regulations only by improving the combustion improvement techniques in the near future. We require highly effective postprocessing technology...
Keiichiro Yoshida, Toshiaki Yamamoto, Tomoyuki Kuroki, Masaaki Okubo
Plasma Chemistry and Plasma Processing   29 373-386   Oct 2009
A pilot-scale pulse corona induced plasma chemical process (PPCP) reactor for controlling gas-phase dioxins and NO x simultaneously is installed in a garbage incineration plant. The flow rate of the sampled flue gas is 5,000 Nm 3/h (N: standard st...
Keiichiro Yoshida, Masaaki Okubo, Tomoyuki Kuroki, Toshiaki Yamamoto
International Journal of Emerging Multidisciplinary Fluid Sciences   1 201-211   Sep 2009
The NOx reduction performance of three types of nonthermal plasma (NTP) reactors is compared. An experiment using simulated gas is first conducted. Subsequently, those reactors are applied to a NOx aftertreatment system for a stationary diesel eng...
YAMAMOTO Toshiaki, OKUBO Masaaki, KUROKI Tomoyuki
Journal of the Institute of Electrostatics Japan   33(1) 51-55   Feb 2009
Tomoyuki Kuroki, Takeshi Fujioka, Ryouhei Kawabata, Masaaki Okubo, Toshiaki Yamamoto
IEEE Transactions on Industry Applications   45(1) 10-15   Feb 2009
In order to develop an economical volatile organic compound (VOC) removal process, a concentration technique using nonthermal plasma combined with an adsorption process is investigated. Toluene-one of the most commonly used VOCs-is used, and the o...
Toshiaki Yamamoto, Akinori Kajimoto, Masaaki Okubo, Tomoyuki Kuroki, Keiichiro Yoshida
IEEE Transactions on Industry Applications   44(5) 1431-1435   Oct 2008
Over the years, we have investigated particulate matter (PM) and NOx reduction using nonthermal plasma-chemical hybrid processes without using catalysts. Among nonthermal plasma hybrid processes, the ozonizer combined with the chemical hybrid reac...
Keiichiro Yoshida, Masaaki Okubo, Tomoyuki Kuroki, Toshiaki Yamamoto
IEEE Transactions on Industry Applications   44(5) 1403-1409   Oct 2008
In this paper, the results of two experiments are reported. First, the performances of various types of nonthermal plasma reactors for NOx reduction were compared. It was shown that the surface-discharge reactors have as high NOx reduction capabil...
Masaaki Okubo, Keiichiro Yoshida, Toshiaki Yamamoto
IEEE Transactions on Industry Applications   44(5) 1410-1417   Oct 2008
Numerical and experimental analyses are conducted on a nanosecond pulse dielectric barrier discharge-induced nonthermal plasma (NTP) for pollution control. In the numerical analysis, a commercial simulation software, CFD-ACE+ solver, is used. The ...
Masaaki Okubo, Mitsuru Tahara, Tomoyuki Kuroki, Toshitomo Hibimo, Noboru Saeki
Journal of Photopolymer Science and Technology   21(2) 219-224   Aug 2008
A low-environmental load surface modification technique for plating the fluorocarbon polymers films is developed using an atmospheric-pressure argon and acrylic acid vapor nonthermal plasma graft polymerization. The results of the T-type peeling t...
Masaaki Okubo, Mitsuru Tahara, Noboru Saeki, Toshiaki Yamamoto
Thin Solid Films   516(19) 6592-6597   Aug 2008
Flexible thin solid films made of fluorocarbon polymers such as PFA (perfluoroalkoxy fluoroplastics), PTFE (polytetrafluoroethylene), and PCTFE (polychlorotrifluoroethylene) have excellent properties in terms of flexibility, gas and moisture barri...
Tomoyuki Kuroki, Hidekatsu Fujishima, Keiichi Otsuka, Tomohiro Ito, Masaaki Okubo, Toshiaki Yamamoto, Keiichiro Yoshida
Thin Solid Films   516(19) 6704-6709   Aug 2008
NOx removal from an actual boiler flue gas is investigated using an indirect plasma and chemical hybrid system comprising a commercial ozonizer and an Na2SO3 chemical scrubber. A high NOx removal efficiency in the continuous operation of a commerc...
Masaaki Okubo, Noboru Saeki, Toshiaki Yamamoto
Journal of Electrostatics   66(7-8) 381-387   Jul 2008
When atmospheric pressure nonthermal plasma (APNTP) is first applied followed by graft polymerization of hydrophilic monomers on the surface of cloth, the cross-section of the cloth acquires functionally graded hydrophilicity and controls moisture...
YOSHIDA Keiichiro, HIBINO Toshitomo, SAEKI Noboru, OKUBO Masaaki
静電気学会誌 = Journal of the Institute of Electrostatics Japan   32(2) 90-91   Apr 2008
Masaaki Okubo, Naoki Arita, Tomoyuki Kuroki, Keiichiro Yoshida, Toshiaki Yamamoto
Plasma Chemistry and Plasma Processing   28(2) 173-187   Apr 2008
An innovative total diesel emission control system for diesel particulate and NOx simultaneous reduction is proposed. In this system, the plasma reactor is located outside the emission exhaust pipe and activated gas induced from ozone activated by...
OKUBO Masaaki
Journal of plasma and fusion research   84(2) 121-134   Feb 2008
化石燃料エネルギ機器の効率向上に伴い,排ガス温度は低下の一途をたどり,原料貴金属の価格高騰とも相まって触媒法による排ガス浄化は限界に近づいている.そのため,大気圧低温プラズマを排ガスに印加して,低温かつ無触媒または少量の触媒でNOxや微粒子の浄化を行う試みは必然的であり,研究が活発化してきている.しかし排ガス浄化にプラズマを単独で使用することは,大量の電力を要し燃焼機器への適用は難しいことが判明しており,他の技術を組み合わせた複合処理が必要となる.本稿では著者らが提案するプラズマ複合排ガス...
Masaaki Okubo, Hidetaka Kametaka, Keiichiro Yoshida, Toshiaki Yamamoto
Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers   46(8A) 5288-5293   Aug 2007
Odor control has gained importance for ensuring a comfortable living environment. In this paper, the authors report the experimental results of a study of the detailed characteristics of a barrier-type packed-bed nonthermal plasma reactor used for...
Tomoyuki Kuroki, Shingo Tanaka, Masaaki Okubo, Toshiaki Yamamoto
IEEE Transactions on Industry Applications   43(4) 1075-1083   Jul 2007
Among perfluorocompounds, CF4 is considered to be one of the most stable and difficult-to-decompose gases. We investigated the decomposition of CF4 using the inductively coupled plasma (ICP) reactor with radio frequency (RF) power supply, which wa...
Keiichiro Yoshida, Masaaki Okubo, Toshiaki Yamamoto
Applied Physics Letters   90(131501) 1-3   Apr 2007
Nonthermal plasma (NTP) desorption is used in NOx aftertreatment systems for diesel engine exhaust gas. The authors conducted desorption experiments for both NTP and thermal desorptions under similar conditions and electric power levels. The resul...
Toshiaki Yamamoto, Goichi Tanioka, Masaaki Okubo, Tomoyuki Kuroki
Journal of Electrostatics   65(4) 221-227   Apr 2007
The dehumidifying action of a dehumidifier or air conditioner was employed to achieve a comfortable and desirable indoor comfort. Water vapor adsorbed on an adsorbent substance needs to be regenerated when the water vapor exceeds the adsorption ca...
Masaaki Okubo, Naoki Arita, Tomoyuki Kuroki, Toshiaki Yamamoto
Thin Solid Films   515(9) 4289-4295   Mar 2007
One of the promising applications of nonthermal plasma (NTP) for environmental cleanup technology is low-temperature oxidation or incineration of carbon particulate matter (PM) in diesel engine emissions. In this process, NO2 and activated radical...
Tomoyuki Kuroki, Takeshi Fujioka, Masaaki Okubo, Toshiaki Yamamoto
Thin Solid Films   515(9) 4272-4277   Mar 2007
In general, the gas concentration of volatile organic compounds (VOCs) is low (in ppm levels) and the gas volume is large, for example, the indoor exhaust gas flow rate and VOCs concentration from a certain printing factory are 800 Nm3/min and 17 ...
YOSHIDA Keiichiro, OKUBO Masaaki, KUROKI Tomoyuki, YAMAMOTO Toshiaki
Transactions of the Japan Society of Mechanical Engineers B   73(725) 372-379   Jan 2007
The NO_x desorption performances by the nonthermal plasma (NTP) desorption and the thermal desorption were compared for regeneration of NO adsorbent zeolite, 13X. The results show that the most effective NO_x desorption was the thermal desorption ...
Toshiaki Yamamoto, Masaaki Okubo, Tomoyuki Kuroki, Keiichiro Yoshida
Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   73(732) 1767-1774   Jan 2007
A pilot-scale PPCP (Pulse corona induced Plasma Chemical Process) system for controlling gas-phase dioxins and NOx was installed in the incineration plant. The gas flow rate was varied up to 5 000 Nm3/h, branched out from the existing duct. The PP...
Keiichiro Yoshida, Masaaki Okubo, Tomoyuki Kuroki, Toshiaki Yamamoto
SAE Technical Papers      Jan 2007
In our previous studies, a novel NOx aftertreatment system using adsorption and reduction by nonthermal plasma desorption is proposed. In the present study, application of the system to a real stationary diesel engine generator is investigated. Th...
YOSHIDA Keiichiro, OKUBO Masaaki, KUROKI Tomoyuki, YAMAMOTO Toshiaki
Journal of the Institute of Electrostatics Japan   30(6) 284-290   Dec 2006
OKUBO Masaaki, YAMAMOTO Toshiaki
Earozoru Kenkyu   21(3) 220-225   Sep 2006
New atmospheric-pressure nonequilibrium plasma combined exhaust gas aftertreatment technologies are developed without using precious metal catalysts and harmful ammonia etc. Two types of innovative environmental protection systems (a dry system an...
Toshiaki Yamamoto, Yoshifumi Morita, Hidekatsu Fujishima, Masaaki Okubo
Journal of Electrostatics   64(7-9) 628-633   Jul 2006
The three-dimensional flow interaction for tuft or point corona for industrial electrostatic precipitators was investigated using both laminar and turbulent flow models. The secondary flow distribution based on laminar flow model forms a pair of o...
Tomoyuki Kuroki, Keiichiro Yoshida, Hirotoshi Watanabe, Masaaki Okubo, Toshiaki Yamamoto
Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers   45(5A) 4296-4300   May 2006
Many researchers have investigated the decomposition of trace phenol in solution using liquid-phase discharge. However, liquid-phase discharge has a problem of consuming an extremely high energy. We have investigated phenol decomposition using a g...
Tomoyuki Kuroki, Hirotoshi Watanabe, Masaaki Okubo, Toshiaki Yamamoto
IEEJ Transactions on Industry Applications   126    Mar 2006
The used cutting oil contains not only fine metals but also sludge and other compounds which cause the source of odors as time elapses. In the present study, the two types of electrolytic bubble flotation reactors, such as the flow type reactor an...
KUROKI Tomoyuki, WATANABE Hirotoshi, OKUBO Masaaki, YAMAMOTO Toshiaki
IEEJ Transactions on Industry Applications   126(3) 330-336   Mar 2006
The used cutting oil contains not only fine metals but also sludge and other compounds which cause the source of odors as time elapses. In the present study, the two types of electrolytic bubble flotation reactors, such as the flow type reactor an...
OKUBO Masaaki, SAEKI Noboru, TAGUCHI Takahisa, YAMAMOTO Toshiaki
TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A   72(714) 263-268   Feb 2006
When the plasma is first applied and hydrophilic monomers are next graft-polymerized to the surface of cloth, the cloth comes to breathe moisture and control offensive odor simultaneously. The objectives of the present study are to manufacture an ...
Hidekatsu Fujishima, Yoshifumi Morita, Masaaki Okubo, Toshiaki Yamamoto
IEEE Transactions on Dielectrics and Electrical Insulation   13(1) 160-167   Feb 2006
The three-dimensional flow interaction between the primary flow and the secondary flow (often called an electric wind or ionic wind) for tuft/point corona in the wire-duct type electrostatic precipitators (ESPs) has been investigated in the past. ...
Masaaki Okubo, Masaki Inoue, Tomoyuki Kuroki, Toshiaki Yamamoto
IEEE Transactions on Industry Applications   41(4) 891-899   Jul 2005
In the flue emission from an internal combustion system using diffusing combustion such as coal or oil fuel boiler, incinerator, or diesel engine, around 10% oxygen is usually included. It is difficult to reduce the NOx in the emission completely ...
Hidekatsu Fujishima, Shunji Haruna, Tomoyuki Kuroki, Masaaki Okubo, Toshiaki Yamamoto
Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   71(711) 2816-2822   Jan 2005
Previous results have shown that the plasma-chemical hybrid process was effective for simultaneous removal of NOx, SOx and diesel particulate. In the present study, two types of plasma supplies, the direct oxidation method and the indirect plasma ...

Misc

 
Coherent Structure in the Turbulent Wake behind a Circular Cylinder(3. Flow Visualization and Hot Wire Measurements)(共著)
Fluid Dynamics Research   4,47    1988
Coherent Structure in the Turbulent Wake behind a Circular Cylinder(2. Numerical Simulation Using the Vortex Filament Model)(共著)
Fluid Dynamics Research   4,39    1988
JSME International Journal(Series 2)   32(1) 39   1989
Interfacial Waves of the Magnetic Fluid in Vertical Alternating Magnetic Fields(共著)
Journal of Magnetisum and Magnetic Materials   85(1-3) 163   1990
Visualization and Analysis of Gas bubbles' Motion in a Two-phase Flow of Magnetic Fluid
Preprint of the Japan Society of Magnetic Fluid Research   31    1991
Magnetic Fluid Flows in a Traveling Magnetic Field with Higher Components
Preprint of the Japan Society of Magnetic Fluid Research   4    1991
Analytical Study on Two-phase MHD Flow of Electrically Conducting Magnetic Fluid(共著)
Proceedings on the International Conference on Energy Transfer in Magnetohydrodymamic Flows   323    1991
Gas-Liquid Two-phase Flow of Magnetic Fluids(共著)
Proceedings of the International Conference on Multiphase Flows,   3,77    1991
Stochastic Numerical Analysis on Particle-laden Pipe Flow
Proceedings of the Sixth Symposium on Numerical Fluid Mechanics   151    1992
Study on Boiling Two-phase Flows of Magnetic Fluid(Analysis on Thermal Non-equilibrium Gas-liquid Two-phase Flow)
Preprint of the Japan Society of Magnetic Fluid Research   10    1993
Theoretical Analysis on Two-phase Flow Characteristics of Temperature-sensitive Electrically Conducting Magnetic Fluid in MHD Power Generation System
Preprint of the Japan Society of Mechanical Engineers   931(2) 120   1993
Numerical Simulation of a Low Pressure Plasma Jet in the Applied Magnetic Field(共著)
Proceedings of the 11th International Symposium on Plasma Chemistry   284    1993
Basic Study of Non-contacting Support of Thin Plate by Fluid Cushion Force(共著)
Proceedings of the Second International Conference on Fluid Mechanics   1072    1993
Intefacial Parametric Instability of Magnetic Fluid Induced by a Horizontal AC Magnetic Field(共著)
Proceedings of the Second International Conference on Fluid Mechanics   156    1993
Analytical Study on Two-phase MHD Flow of Electrically Conducting Magnetic Fluid(共著)
Magnethydrodynamics   29(3) 291   1994
Hydrogen Nonequilibrium Disk MHD Generator for Space Power System (共著)
Proc. the 16th Symp. Efficient Use Energy and Direct Electrical Power Generation   11,1   1994
Nonequilibrium Disk MHD Generation Performances Operating with and without Full Seed Ionization (共著)
Proc. the 16th Symp. Efficient Use of Energy and Direct Electrical Power Generation   (3.2.1)    1994
Bubble Behavior in a Magnetic Fluid in a Nonuniform Magnetic Field(共著)
Proceeding of the 2nd International Symp. Cavitation   350   1994
Basic Study on an Energy Conversion System Gas-Liquid Two-Phase Flows of Magnetic Fluid (共著)
Proceedings of the 1994 ASME Fluids Engineering Division Summer Meeting   FED194 105   1994
Study on Non-contacting Support of Strip by Fluid Cushon Force (共著)
Proceeding of the 1994 ASME Fluids Engineering Division Summer Meeting   FED186 113   1994
Numerical Simulation on Flows in Disk Channel
Report on the meeting of IEE of Japan   ESC94(34-38) 31   1994
Pressure Loss and Boundary Layer Control of Supersonic Radial Flow in Disk Channel (共著)
Proc. the 16th Symp. Efficient Use of Energy and Direct Electrical Power Generation.   91   1994
Yasuo Shimokawa, Masaaki Okubo, Shinichi Kamiyama
American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED   186 113-118   Jan 1994
In the surface finishing line of cold steel, many surface defects are caused by contact between a roller support and strip. An optimal surface finishing process should support the strip without contact by a roller in order to get high quality stee...
Masaaki Okubo, Jun Ishimoto, Shinichi Kamiyama
American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED   194 105-110   Jan 1994
The mechanism of the pressure rise in a gas-liquid two-phase pipe flow of magnetic fluid under a nonuniform magnetic field is investigated in detail both theoretically and experimentally. First, governing equations of one-dimensional gas-liquid tw...
Visualization Analysis on the Boiling Two-phase Flow Characteristics of Magnetic Fluid in Nonuniform Magnetic Field(共著)
Flow Visualization and Image Processing of Multipahse Systems   209 179   1995
Effect of Magnetic Field on the Stability of Boiling Two-Phase Flows of Magnetic Fluid(共著)
Proc. 2nd Int. Conf. Multiphase Flow   4 FC17   1995
Numerical Simulation of Pressure Loss Mechanizm in Disk Channel(共著)
Proc. 33rd Symp. on Engineering Aspects of MHD   VII4-1   1995
Numerical Simulation and Experimental Studies on Supersonic Flow in Disk Channel(共著)
Proc. 17th Symp. on Efficient Use of Energy and Direct Electrical Power Generation   171   1995
Jun Ishimoto, Masaaki Okubo, Shinichi Kamiyama, Masaru Higashitani
JSME Int. Journal   38(3) 382-387   1995
Jun Ishimoto, Masaaki Okubo, Shinichi Kamiyama
American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED   209 179-186   Dec 1995
The flow visualization and image processing is made to clarify the effects of nonuniform magnetic field on the characteristics of boiling two-phase pipe flow of temperature sensitive magnetic fluid. The aspect of the two-phase flow is visualized w...
Three-Dimensional Numerical Simulation of Pressure Loss Mechanism in Supersonic Radial Flow(共著)
Proc. 12th Int. Conf. MHD Electrical Power Generation   2 914   1996
Stagnation Pressure Loss Mechanism of Supersonic Flow in Disk MHD Generator(共著)
Proc. 12th Int. Conf. MHD Electrical Power Generation   2 762   1996
Experimental Studies on Enthalpy Extraction and Adiabatic Efficiency of Disk CCMHD Generator with Ar/Cs(共著)
Proc. 12th Int. Conf. MHD Electrical Power Generation   1 212   1996
Effect of Segmental Load Resistances on Performance of Disk MHD Generator(共著)
Proc. 12th Int. Conf. MHD Electrical Power Generation   1 196   1996
Discharge Structure of Nonequilibrium Plasma in Disk MHD Generator with Ar/Cs(共著)
Proc. 12th Int. Conf. MHD Electrical Power Generation   1 176   1996
Numerical Prediction on Performance of Closed Cycle Disk MHD Generator(共著)
Proc. 12th Int. Conf. MHD Electrical Power Generation   1 148   1996
Effect of Stagnation Gas Pressure on Performances of Disk MHD Generator(共著)
Proc. 12th Int. Conf. MHD Electrical Power Generation   1 83   1996
Performances of Closed Cycle Disk MHD Generator with Ar/Cs(共著)
Proc. 31st Intersociety Energy Conversion Eng. Conf.   2 854   1996
Numerical Prediction on Performance of Closed Cycle Disk MHD Generator(共著)
Proc. 31st Intersociety Energy Conversion Eng. Conf.   2 842   1996
Experimental Studies on Performances of Disk MHD Generator(共著)
Proc. '96 Symp. Advanced Res. Energy Tech.   A5.3   1996
Mechanism of Pressure Loss in Disk MHD Generator(共著)
Proc. 96 Symp. Advanced Res. Energy Tech.   9   1996
Numerical Analysis of Disk MHD Generators with Different Area Ratios(共著)
Proc. 12th Int. Conf. MHD Electrical Power Generation   2 953   1996
Masaaki Okubo, Hiroyuki Yamasaki
Proceedings of the Intersociety Energy Conversion Engineering Conference   2 842-847   Dec 1996
Numerical calculations were made on nonequilibrium MHD flows in a disk MHD generator in a strong magnetic field. Main objectives of the present study are to develop a numerical simulator for our present closed cycle disk MHD generator and to obtai...
Hiroyuki Yamasaki, Kazuhiko Hayakawa, Yoshiki Nagasaki, Masafumi Suzuki, Ryo Hanaoka, Masaaki Takata, Masaaki Okubo
Proceedings of the Intersociety Energy Conversion Engineering Conference   2 854-859   Dec 1996
Recent experimental results of shock-tube driven disk MHD generator with Ar/Cs are reported. Experiments were carried out at various load conditions, two different stagnation pressures and various seed fractions. Under the present experimental con...
Recent Experimental Results of Disk MHD Generator(共著)
Proc. of 1997 Symp. on Advanced Research of Energy Technology   156-165   1997
Study on Fluctuation of Plasma in CCMHD Generator(共著)
Proc. of 1997 Symp. on Advanced Research of Energy Technology   443-450   1997
Numerical Analysis on Performance of Disk Plasma MHD Generator (Effects of Stagnation Pressures on Performances in Numerical and Experimental Results)(共著)
Proc. of 1997 Symp. on Advanced Research of Energy Technology   431-442   1997
The Transactions of The Instiute of Electrical Engineers of Japan   117B(1) 122   1997
Effect of Nonthermal Plasma on NOx Control(共著)
Proc. Asia-Pacific Workshop on Water and Air Treatment by Advanced Oxidation Technologies   50-56   1998
Numerical Studies on Improvement of Disk MHD Generator Performance(共著)
Proc. 33rd Intersociety Energy Conversion Eng. Conf.   CD-ROM    1998
Numerical simulation of Dischrage Structures in Ar/Cs Nonequilibrium Plasma MHD Generator(共著)
Proc. 33rd Intersociety Energy Conversion Eng. Conf.   CD-ROM    1998
Numerical Simulation of Dischrage Structures in Ar/Cs Nonequilibrium Plasma Disk MHD Generator(共著)
Proc. Int. Symp. on Computational Technologies for Fluid/Thermal/ChemicalSystems with Industrial Applications   1 167-173   1998
Fluctuations of Electron Density in Disk MHD Generator(共著)
Proc. of 1998 Int. Symp. on Advanced Energy Technology   409-414   1998
Effect of Stagnation Pressure on Performances of Disk MHD Generator(共著)
Proc. of 1998 Int. Symp. on Advanced Energy Technology   369-376   1998
Performances of Disk CCMHD Generator with Small Area Ratio(共著)
Proc. of 1998 Int. Symp. on Advanced Energy Technology   351-360   1998
Studies on MHD Flow in A Disk Generator with FUJI-1 Facility(共著)
Proc. of 1998 Int. Symp. on Advanced Energy Technology   293-300   1998
Recent Power Generation Experiments with FUJI-1 CCMHD Blow-down Facility(共著)
Proc. of 1998 Int. Symp. on Advanced Energy Technology   277-284   1998
Numerical Studies on Improvement of Disk MHD Generator Performance(共著)
Proc. of 1998 Int. Symp. on Advanced Energy Technology   309-316   1998
Masaaki Okubo, Sigeharu Kabashima, Yoshihiro Okuno, Hiroyuki Yamasaki
American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP   377 167-173   Jan 1998
A two-dimensional (r-θ) numerical simulation to our disk MHD power generation experiment was carried out considering the transient ionization process in the nozzle. The objectives of this study were to explain discharge structures observed in the ...
Performance of Indoor Electric Air Cleaner Using Nonthermal Plasma
Proceedings of First Asia Aerosol Conference   111   1999
Towards Ideal NOx Control Technology Using Plasma-Chemical Hybrid Process(共著)
Proc. 1999 IEEE/IAS 34th Annual Meeting   1495-1504   1999
Electric Air Cleaner Composed of Non-Thermal Plasma Reactor and Electrostatic Precipitator(共著)
Conference Record of 1999 IEEE/IAS 34th Annual Meeting   3 1483-1488   1999
M. Okubo, T. Yamamoto, T. Kuroki, H. Fukumoto
Conference Record - IAS Annual Meeting (IEEE Industry Applications Society)   3 1483-1488   Dec 1999
Recent concerns of environmental protection encourage to use a compact indoor air cleaner and various types of electrostatic precipitators (ESPs) have been manufactured. Although a wide range of particles in the air such as airborne dusts can be c...
T. Yamamoto, M. Okubo, K. Hayakawa, K. Kitaura
Conference Record - IAS Annual Meeting (IEEE Industry Applications Society)   3 1495-1502   Dec 1999
The plasma-chemical hybrid process developed was extremely effective and economical in comparison with the conventional selective catalytic reduction (SCR) system and other technologies for NOx removal from the flue gas emissions. A series of expe...
Environmental Protection Engineering Laboratory, Osaka Prefecture University
Journal of the Institute of Electrostatics Japan   24(3) 165   2000
Control of Cigarette Smoke Using Non-Equilibrium Plasma
Proc.4th ESA/IEJ Joint Symposium in Electrostatics   164-173    2000
NOx Removal Characteristics in Diesel Engine Exhaust Using Plasma-Chemical Hybrid Process
Proc.4th ESA/IEJ Joint Symposium in Electrostatics   341-354    2000
Hydrophobic and Hydrophilic Properties of Glass Surface Using Nonthermal Plasma
Proc. 4th ESA/IEJ Joint Symposium in Electrostatics   314-323    2000
Desorption and Regeneration of NOx Using Non-Equilibrium Plasma
Proceedings of the First Polish-Japanese Hakone Group Symposium of Non-thermal Plasma Processing of Water and Air   19   2000
Masaaki Okubo, Tomoyuki Kuroki, Hideya Kametaka, Toshiaki Yamamoto
IEEE Transactions on Industry Applications   2(5) 868-875   Jan 2000
Odor control from living environment becomes the increased concern. In the previous study, we investigated the removal of acetaldehyde (CH3CHO) which is one of the main odor components in tobacco smoke using the barrier type packed-bed plasma reac...
T. Yamamoto, M. Okubo, T. Nagaoka, K. Hayakawa
Conference Record - IAS Annual Meeting (IEEE Industry Applications Society)   1 641-647   Dec 2000
In the previous studies, we confirmed that the plasma-chemical combined hybrid process for controlling NOx flue gas emission was extremely effective and economical in comparison with the conventional selective catalytic reduction (SCR) system and ...
Environmental Protection Technology Using Nonthermal Plasma
The 89th Meeting of JSME Kansai Branch Student Committee   Invited Lecture    2001
Diesel Engine Emission Control Using Plasma-Chemical Hybrid Process
Proc. of Second International Symposium on the Basic and Application of Plasma Technology   79-84    2001
NOx and SO2 Removal for Optimum Plasma Process
Proc. of 25th International Conferences on Phenomena in Ionized Gases   4, / 121-122    2001
Improvement of Energy Efficiency for Removal of Diesel Engine Emission NOx Using Pulsed Corona Plasma-Chemical Hybrid Process
Proc. of 25th International Conferences on Phenomena in Ionized Gases   4, / 113-114    2001
Adsorption and Nonthermal Plasma Desorption Process for Concentrating NOx in Flue Gas
Proceedings of the 2001 IEEE Industry Applications Conference   1, / 698-705    2001
Single-Stage Plasma-Chemical Process for Particulates, NOx and SOx Simultaneous Removal
Proceedings of the 2001 IEEE Industry Applications Conference   1, / 675-679    2001
Preparation of Functional Cloth with Moisture Breath and Odor Control Properties Using Atmospheric-Pressure Plasma-Graft Polymerization
The 2nd Asian Aerosol Conference   361-362    2001
Simultaneous Removal of NOx and SOx in Flue Gas Emission Using Plasma-Chemical Hybrid Process
IEEE Transactions on Industry Applications      2001
T. Yamamoto, B. S. Rajanikanth, M. Okubo, T. Kuroki, M. Nishino
Proceedings of the 2001 IEEE Industry Applications Conference   2 1092-1098   Jan 2001
The discharge plasma-chemical hybrid process for NOx removal from the flue gas emissions is an extremely effective and economical approach in comparison with the conventional selective catalytic reduction system. In this paper we bring out a relat...
T. Kuroki, M. Takahashi, M. Okubo, T. Yamamoto
Conference Record - IAS Annual Meeting (IEEE Industry Applications Society)   1 675-679   Jan 2001
In previous study, we investigated the simultaneous removal of NOx and SOx using plasma-chemical hybrid process and showed nearly 100% NOx and SOx removal. In this study, we investigated simultaneous removal of NOx, SOx and particulates using a si...
M. Okubo, G. Tanioka, T. Kuroki, T. Yamamoto
Conference Record - IAS Annual Meeting (IEEE Industry Applications Society)   1 698-705   Jan 2001
The gas flow rates for hazardous air pollutant (HAP) emissions are generally large and their concentrations are low (in ppm levels). When we try to treat directly the large flow rate and low concentration exhaust gas, the size of the equipment bec...
T. Yamamoto, M. Okubo, K. Kitaura, T. Miyashita
ACS National Meeting Book of Abstracts   41    Dec 2001
A series of experiments using the plasma-chemical hybrid system were performed to control NOx from the diesel engine emission. The operating characteristics and the optimum plasma reactor were studied in regard to reaction products, e.g., N2O, CO,...
CF4 Decomposition of Flue Gas from Semiconductor Process Using Inductively Coupled Plasma
Proceedings of the 2002 IEEE-IAS Meeting   1810-1815   2002
Simultaneous Removal of NOx, SOx and Soot Particles in Diesel Engine Exhaust Gas using Corona Plasma-Chemical Hybrid Process
Proceedings of the ESCAMPIG16/icrp5   363-364   2002
NOx Concentration Technique Using Pulsed Corona Plasma
Proceedings of the ESA-IEJ Joint Meeting   292-303   2002
M. Okubo, T. Miyashita, T. Kuroki, S. Miwa, T. Yamamoto
Proceedings of the 2002 IEEE-IAS Meeting   3 1833-1840   Jan 2002
The regulation for the automotive diesel engine emission becomes severe every year, and it is difficult to meet the requirement only by the combustion improvement techniques in the near future. More effective post-processing technology is desired ...
T. Kuroki, J. Mine, S. Odahara, M. Okubo, T. Yamamoto, N. Saeki
Conference Record - IAS Annual Meeting (IEEE Industry Applications Society)   3 1810-1815   Jan 2002
Flue gases from semiconductor process, per-fluorinated compounds (PFCs) and hydrofluorinated compounds (HFCs) such as NF3, CF4, C2F6, CHF3 and SF6, are being regulated internationally because their gases cause green effect and have more than 5,000...
Toshiaki Yamamoto, Miyuki Okuda, Masaaki Okubo
Proceedings of the 2002 IEEE-IAS Meeting   2 1397-1403   Jan 2002
The flow interaction between the primary flow and the secondary flow (often called as an electric wind or ionic wind) in the wire-duct electrostatic precipitator (ESP) has been investigated theoretically and experimentally. In the past, the analys...
Toshiaki Yamamoto, Miyuki Okuda, Masaaki Okubo
Proceedings of the 2002 IEEE Dielectrics and Electrical Insulation Society   228-231   Jan 2002
The flow interaction between the primary flow and the secondary flow (often called as an electric wind or ionic wind) for the tufts on the corona wire or the point coronas on the discharge wire requires three-dimensional analysis. Three-dimensiona...
Fundamentals and Applications of Nonthermal Plasma for Environmental Protection and Surface Modification ‘jointly worked’
Advanced Physicochemical Treatment Processes, Humana Press, Inc.   307 pages (double space)    2003
Odor Control ‘jointly worked’
Advanced Air and Noise Pollution and Control, the Handbook of Environmental Engineering Series, Humana Press, Inc.   117 pages (double space)    2003
CF4 Decomposition Using Inductivity Coupled Plasma, —Effect of Power Frequency—
IEEE Transactions on Industry Applications      2003
Low Temperature Soot Incineration of Diesel Particulate Filter Using Remote Nonthermal Plasma
IEEE Transactions on Industry Applications      2003
Aluminum Surface Treatment Using Plasma-Assisted Dry Chemical Process
IEEE Transactions on Industry Applications      2003
CF4Decomposition Using RF Plasma
Conference Record of 30th IEEE International Conference on Plasma Science   (total 1 pages)    2003
Aluminum Surface Treatment Using Plasma-Assisted Dry Chemical Process
Proceedings of the ESA-IEEE Joint Meeting on Electrostatics   846-524   2003
Effect of Frequency for Inductively Coupled Plasma on CF4 Decomposition
Proceedings of the ESA-IEEE Joint Meeting on Electrostatics   665-677   2003
Low Temperature Soot Incineration of DPF Using Nonthermal Plasma Induced Radical Injection
Proceedings of the ESA-IEEE Joint Meeting on Electrostatics   416-430   2003

Books etc

 
New Technologies for Emission Control in Marine Diesel Engines
Masaaki Okubo and Takuya Kuwahara (Part:Joint Work)
Elsevier   Aug 2019   

Conference Activities & Talks

 
正川 浩貴, 山本 雄理, 山本 翔也, 藤島 英勝, 黒木 智之, 大久保 雅章, 山本 柱
電気学会研究会資料. PST   9 Aug 2016   
小林 祐樹, 藤原 雄輝, 大久保 雅章, 黒木 智之
電気学会研究会資料. PST   9 Aug 2016   
IKEDA Naoki, KATAOKA Yousuke, KUROKI Tomoyuki, OKUBO Masaaki
The Proceedings of the Symposium on Environmental Engineering   2015   
This paper describes NO_X reduction for a diesel engine using exhaust gas component recirculation (EGCR). EGCR is the aftertreatment technology for NO_X reduction by intake of NO_X extracted from exhaust gas to diesel engine. In this experiment, N...
OKUBO Masaaki, TANAKA Masanari, TAKAHASHI Kazuya, NAKAJIMA Kenji, KUROKI Tomoyuki
The Proceedings of the Symposium on Environmental Engineering   2015   
Carbon dioxide (CO_2) is one of the main substances linked to greenhouse effect, and its emission should be reduced. In this study, a CO_2 reduction treatment using an adsorbent and a nonthermal plasma flow is investigated. This treatment comprise...
FUJISHIMA Hidekatsu, KUROKI Tomoyuki, TANAKA Atsushi, OTSUKA Keiichi, OKUBO Masaaki
The Proceedings of the Symposium on Environmental Engineering   2014   
A low emission hot water or steam supplying system (2.5 t/h) which consisted of a multi-fuel boiler and a plasma-chemical hybrid NO_x removal was demonstrated Bio-oils or waste oil with city gas or heavy oil (A type) could be fired satisfactorily ...
YAMAMOTO Hashira, KUROKI Tomoyuki, FUJISHIMA Hidekatsu, OKUBO Masaaki
The Proceedings of the Symposium on Environmental Engineering   2014   
The plasma and chemical hybrid process (PCHP) is an innovative technology for simultaneous removal of NO_x (NO and NO_2) and SO_x (SO_2 and SO_3). PCHP is demonstrated for an exhaust gas in glass melting furnaces. NO which compose 90% of the NO_x ...
KUWAHARA Takuya, YOSHIDA Keiichiro, HANAMOTO Kenichi, SATO Kazutoshi, KUROKI Tomoyuki, OKUBO Masaaki
The Proceedings of the Symposium on Environmental Engineering   2013   
As the regulations governing diesel engine emissions become more stringent, an effective aftertreatment technology is thu s needed for, particularly with regard to particulate matter. Although the use of ceramic diesel particulate filters (DPF) is...
OKUBO Masaaki, KUWAHARA Takuya, YOSHIDA Keiichiro, KUROKI Tomoyuki
The Proceedings of the Symposium on Environmental Engineering   2013   
The regulations governing marine diesel engine NO_x emission in the International Maritime Organization (IMO) emission standards have become more stringent. Because it is difficult to fulfill these requirements by means of combustion improvement a...
KUWAHARA Takuya, SHINOHARA Taiki, KAWAI Masashi, YOSHIDA Keiichiro, HANAMOTO Kenichi, SATO Kazutoshi, KUROKI Tomoyuki, OKUBO Masaaki
The Proceedings of Mechanical Engineering Congress, Japan   2012   
As the regulations governing diesel engine emissions such as particulate matter (PM) and NOx become more stringent, it is difficult to fulfill these new requirements using only techniques that improve combustion. More effective aftertreatment tech...
Kuwahara Takuya, Kuroki Tomoyuki, Okubo Masaaki, Nishimoto Masahumi, Yoshida Keiichirou
The Proceedings of the Symposium on Environmental Engineering   2012   
Every year, stricter regulations are imposed on diesel engine emissions. It is difficult to satisfy these regulations only by improving the combustion improvement techniques in the near future. To overcome the problem, a treatment method of diesel...
Okubo Masaaki, Kuwahara Takuya, Yoshida Keiichirou, Hujisima Hidekatsu, Kuroki Tomoyuki
The Proceedings of the Symposium on Environmental Engineering   2012   
Catalytic aflertreatment technology for exhaust gas emitted from fossil fuel combustor or combustion engines is now approaching to a practical limit because the temperature of exhaust gases decreases with increase in the fuel combustion efficiency...
Huruta Keiichirou, Kuwahara Tkuya, Kuroki Tomoyuki, Okubo Masaaki
The Proceedings of the Symposium on Environmental Engineering   2012   
NOx emitted from a stationary diesel engine generator was treated wdth a hybrid system comprising NOx reduction by nonthermal plasma (NTP) and NOx adsorption-desorption. Adsorption-desorption system produces highly concentrated NOx, which is effec...
OKUBO Masaaki, KUROKI Tomoyuki, TAHARA Mitsuru
電気学会研究会資料. PST, プラズマ研究会   7 Aug 2011   
OKUBO Masaaki, KUWAHARA Takuya, NISHIMOTO Masafumi, KUROKI Tomoyuki, YOSHIDA Keiichiro
The Proceedings of the Symposium on Environmental Engineering   2011   
The authors realize a new prototype of plasma-assisted environmental protection aftertreatment system using atmospheric-pressure nonthermal plasma combine processes for super clean diesel engines. This system does not use any rare or precious meta...
KUROKI Tomoyuki, OKUBO Masaaki, MATSUOKA Shigeru, KIM Jong Youl
電気学会研究会資料. PPT, パルスパワー研究会   16 Dec 2010   
KUROKI Tomoyuki, OKUBO Masaaki, MATSUOKA Shigeru, KIM Jong Youl
電気学会研究会資料. PST, プラズマ研究会   16 Dec 2010   
OKUBO Masaaki, YOSHIDA Keiichiro, KUWAHARA Takuya, NISHIMOTO Masafumi, KUROKI Tomoyuki
The Proceedings of the Symposium on Environmental Engineering   2010   
Recently, the authors realized a new prototype of plasma-assisted environmental protection aftertreatment system using atmospheric-pressure nonthermal plasma combine processes for super clean diesel engines. This systems do not use any rare or pre...
FUJISHIMA Hidekatsu, KUROKI Tomoyuki, TANAKA Atsushi, OTSUKA Keiichi, OKUBO Masaaki
The Proceedings of the Symposium on Environmental Engineering   2010   
The newly installed pilot-scale NO_x removal from boiler emission of various fuels, such as city gas, heavy oil, and biofuel, was performed using an indirect plasma and chemical hybrid process. The flue gas flow rate was in the range of 675〜2250 N...
TAHARA Mitsuru, OKUBO Masaaki, KUROKI Tomoyuki
電気学会研究会資料. PST, プラズマ研究会   4 Sep 2009   
OKUBO Masaaki, FUJISHIMA Hidekatsu, KUROKI Tomoyuki, TATSUMI Atsuyoshi, OTSUKA Keiichi
電気学会研究会資料. PST, プラズマ研究会   8 Aug 2009   
OKUBO Masaaki, YOSHIDA Keiichiro, KAWASAKI Shinpei, KUROKI Tomoyuki
The Proceedings of the Symposium on Environmental Engineering   2009   
Recently, the authors realized a new prototype of plasma-assisted environmental protection aftertreatment system using atmospheric-pressure nonthermal plasma combine processes for super clean diesel engines. This systems do not use any rare or pre...
KUROKI Tomoyuki, HIRAI Kiyoyuki, MATUOKA Shigeru, KIM Jong Youl, OKUBO Masaaki
The Proceedings of the Symposium on Environmental Engineering   2009   
The bench-scale test of toluene removal is carried out using the surface discharge and an adsorbent with gas circulation. The liquid toluene is vaporized in the circulation line, and the toluene gas is adsorbed by the adsorbent. The hydrophobic ze...
FUJISHIMA Hidekatsu, TATSUMI Atsuyoshi, KUROKI Tomoyuki, TANAKA Atsushi, OTSUKA Keiichi, YAMAMOTO Toshiaki, OKUBO Masaaki
The Proceedings of the Symposium on Environmental Engineering   2009   
The pilot-scale NO_x removal from boiler emission of city gas and heavy oil fuels was performed using indirect plasma and a chemical hybrid process. The flue gas flow rate was in the range of 455〜1,440 Nm^3/h, and NO_x concentration of 40 ppm in c...
KAWASAKI Shinpei, YOSHIDA Keiichiro, KUROKI Tomoyuki, OKUBO Masaaki
The Proceedings of Conference of Kansai Branch   2009   
KANNAKA Yohei, YOSHIDA Keiichiro, KUROKI Tomoyuki, OKUBO Masaaki
The Proceedings of Conference of Kansai Branch   2009   
YOSHIOKA Yusuke, KUROKI Tomoyuki, FUJISHIMA Hidekatsu, OKUBO Masaaki
The Proceedings of Conference of Kansai Branch   2009   
ONO Shinichiro, TAHARA Mitsuru, SAEKI Noboru, KUROKI Tomoyuki, OKUBO Masaaki
The Proceedings of Conference of Kansai Branch   2009   
OKUBO Masaaki, TAHARA Mitsuru, KUROKI Tomoyuki, HIBINO Toshitomo
The Proceedings of the Symposium on Environmental Engineering   2008   
A low-environmental load surface modification technique for plating the fluorocarbon polymers films is developed using an atmospheric-pressure argon and acrylic acid vapor nonthermal plasma graft polymerization. The results of the T-type peeling t...
KUROKI Tomoyuki, FUJISHIMA Hidekatsu, OTSUKA Keiichi, ITO Tomohito, TATSUMI Atsumi, OKUBO Masaaki, YAMAMOTO Toshiaki, YOSHIDA Keiichiro
The Proceedings of the Symposium on Environmental Engineering   2008   
Continuous operation tests of the boiler emission treatment plant which consists of a commercial ozonizer for indirect NO oxidation and a Na_2SO_3 chemical scrubber are carried out for gas firing and heavy oil boilers. For gas firing boiler emissi...
YOSHIDA Keiichiro, MIHALCIOIU Adrian, KUROKI Tomoyuki, OKUBO Masaaki
The Proceedings of the Symposium on Environmental Engineering   2008   
The NO_x aftertreatment system, using nonthermal plasma (NTP) reduction and NO_x recirculation, is investigated. A pilot-scale system is applied to a stationary diesel engine generator. In this system, NO_x is first removed by adsorption, and subs...
KUROKI Tomoyuki, OKUBO Masaaki
大会講演概要   11 Apr 2007   
OKUBO Masaaki
The Proceedings of the Fluids engineering conference   2007   
Numerical analyses are conducted on a nanosecond positive pulse dielectric barrier discharge-induced nonthermal plasma (NTP) for pollution control. In the numerical analysis, commercial simulation software, CFD-ACE+ solver, is used. In the one-dim...
HIRAI Kiyoyuki, KAWABATA Ryouhei, KUROKI Tomoyuki, OKUBO Masaaki, YAMAMOTO Toshiaki
The Proceedings of Conference of Kansai Branch   2007   
YAMADA Hideaki, YOSHIDA Keiichiro, OKUBO Masaaki, KUROKI Tomoyuki, YAMAMOTO Toshiaki
The Proceedings of Conference of Kansai Branch   2007   
ITO Tomohiro, FUKUMOTO Yuji, FUJISHIMA Hidekatsu, KUROKI Tomoyuki, OKUBO Masaaki, YAMAMOTO Toshiaki
The Proceedings of Conference of Kansai Branch   2007   
HIBINO Toshitomo, OKUBO Masaaki, TAHARA Mitsuru, SAEKI Noboru, KUROKI Tomoyuki, YAMAMOTO Toshiaki
The Proceedings of Conference of Kansai Branch   2007   
HIBINO Toshitomo, OKUBO Masaaki, TAHARA Mitsuru, SAEKI Noboru, KUROKI Tomoyuki, YAMAMOTO Toshiaki
The Proceedings of the Symposium on Environmental Engineering   2007   
Flexible thin solid films made of fluorocarbon polymers such as PTFE, PFA and PCTFE. have excellent properties on flexibility, gas and moisture barriers, etc. Many electrical devise applications on such as multi-layer flexible electric circuit and...
TAHARA Mitsuru, OKUBO Masaaki
The Proceedings of the Symposium on Environmental Engineering   2007   
In recent years, the new technology on pulse power has been developed. It is based on the method to generate a very high voltage easily by impressing the voltage of the pulse in ultra short time. As a result, the pulse power can induce the plasma ...
YOSHIDA Keiichiro, OKUBO Masaaki, KUROKI Tomoyuki, YAMAMOTO Toshiaki
The Proceedings of the Symposium on Environmental Engineering   2007   
In our previous studies, a novel NO_x aftertreatment system using adsorption and reduction by nonthermal plasma desorption is proposed. In the present study, application of the system to a real stationary diesel engine generator is investigated. T...
FUJISHIMA Hidekatsu, KUROKI Tomoyuki, OTSUKA Keiichi, OKUBO Masaaki, YAMAMOTO Toshiaki
The Proceedings of the Symposium on Environmental Engineering   2007   
The pilot-scale NO_x removal from boiler emission was performed using indirect plasma and a chemical hybrid process. The flue gas flow rate was in the range of 460〜1,430m^3_N/hr, and the gas temperature of 335℃, and NO_x concentration of approxima...
SHIMAZAKI Yasuhiro, OKUBO Masaaki, YAMAMOTO Toshiaki
The Proceedings of the Symposium on Environmental Engineering   2007   
There is increasing concern about health effects of particulate pollutants such as SARS, avian influenza (also human influenza), diesel emission particles, and their restrictions are becoming tight. These are contributor to infectious diseases. Be...
KUROKI Tomoyuki, KAWABATA Ryohei, OKUBOI Masaaki, YAMAMOTO Toshiaki
The Proceedings of the Symposium on Environmental Engineering   2007   
p-Xylene removal is carried out using nonthermal plasma combined with adsorbent. The zeolite molecular sieve pellets are used as adsorbent. After p-Xylene is adsorbed by adsorbent for 130min, regeneration of adsorbent is performed using nonthermal...
OKUBO Masaaki, YOSHIDA Keiichiro, YAMAMOTO Toshiaki, KAMETAKA Hideya
The Proceedings of the Symposium on Environmental Engineering   2007   
Odor control has gained increased importance for ensuring a comfortable living environment. In this paper, the authors report the experimental results of a study of the detailed characteristics of a barrier-type packed-bed nonthermal plasma reacto...
FUKUDA Naohiro, OKUBO Masaaki, KUROKI Tomoyuki, YAMAMOTO Toshiaki
The Proceedings of Conference of Kansai Branch   2006   
KAWABATA Ryouhei, FUZIOKA Takeshi, KUROKI Tomoyuki, OKUBO Masaaki, YAMAMOTO Toshiaki
The Proceedings of Conference of Kansai Branch   2006   
YANO Hiroki, KAJIMOTO Akinori, OKUBO Masaaki, KUROKI Tomoyuki, YAMAMOTO Tosiaki
The Proceedings of Conference of Kansai Branch   2006   
YAMADA Hideaki, YOSHIDA Keiichiro, OKUBO Masaaki, KUROKI Tomoyuki, YAMAMOTO Toshiaki
The Proceedings of Conference of Kansai Branch   2006   
SHIMAZAKI Yasuhiro, OKUBO Masaaki, YAMAMOTO Toshiaki
The Proceedings of Conference of Kansai Branch   2006   
OKUBO Masaaki, KAJIMOTO Akinori, KUROKI Tomoyuki, YOSHIDA Keiichiro, YAMAMOTO Toshiaki
The Proceedings of the Symposium on Environmental Engineering   2006   
The ozonizer combined with the chemical hybrid reactor is investigated using a 479cc (5.5kW) power generation diesel engine. The PM deposited on the diesel particulate filter can be incinerated by ozone and NO_2 and evaluated for various gas tempe...
KUROKI Tomoyuki, YOSHIDA Keiichiro, OKUBO Masaaki, YAMAMOTO Toshiaki, WATANABE Hirotoshi
The Proceedings of the Symposium on Environmental Engineering   2006   
The decomposition of trace phenol in the solution, using a liquid-phase nonthermal plasma, which has been investigated by many researchers, results in extremely high power consumption. Therefore, we have investigated the phenol decomposition, usin...
OKUBO Masaaki, KUROKI Tomoyuki, FUJISHIMA Hidekatsu, YAMAMOTO Toshiaki
The Proceedings of the Symposium on Environmental Engineering   2005   
The pilot-scale NOx removal from boiler emission was performed using our proposed indirect plasma and a chemical hybrid process. The flue gas flow rate was in the range of 450〜1,470m^3_N/hr, the gas temperature of 280℃, and NOx concentration of 30...
Yamamoto Toshiaki, Okubo Masaaki, Kuroki Tomoyuki, Yoshida Keiichiro
The Proceedings of the Fluids engineering conference   2005   
KAJIMOTO Akinori, OKUBO Masaaki, KUROKI Tomoyuki, YAMAMOTO Toshiaki
The Proceedings of the Symposium on Environmental Engineering   2005   
In recent years, the air pollution problems and the influence to human which is caused by NOx and PM from diesel engine exhaust gas become severe social problems. More effective post-processing technology is desired. Although the use of DPF is now...
OKUBO Masaaki, Arita Naoki, KUROKI Tomoyuki, YAMAMOTO Toshiaki
The Proceedings of Conference of Kansai Branch   2005   
Our recent results on a new aftertreatment system of diesel emission using nonthermal plasma, especially on the removal of soot and NOx are reported. The nonthermal plasma regeneration of DPF is an important result in this paper. It was possible a...
HARUNA Shunji, FUJISHIMA Hidekatsu, KUROKI Tomoyuki, OKUBO Masaaki, YAMAMOTO Toshiaki
The Proceedings of Conference of Kansai Branch   2005   
In the present study, two types of plasma supplies, the direct plasma oxidation method and the indirect plasma oxidation (air radical injection) method, were evaluated with regard to NO oxidation rate, NOx removal efficiency and applied power. The...
OKUBO Masaaki, Arita Naoki, KUROKI Tomoyuki, YAMAMOTO Toshiaki
The Proceedings of Conference of Kansai Branch   2004   
Recent studies on the after treatment of diesel engine exhaust gas using nonequilibrium low temperature plasma, especially on the removal of soot and NO_X are reported. The nonthermal plasma regeneration of DPF is an important result in this paper...
FUJISHIMA Hidekatsu, MORITA Yoshifumi, KUROKI Tomoyuki, OKUBO Masaaki, YAMAMOTO Toshiaki
The Proceedings of Conference of Kansai Branch   2004   
The industrial electrostatic precipitators (ESPs) employ negative corona or point corona, which generates discrete discharge along the wire electrodes. Three-dimensional analysis of electrical characteristics and electrohydrodynamics is essential ...
Kuroki Tomoyuki, Tanaka Shingo, Okubo Masaaki, Saeki Noboru, Yamamoto Toshiaki
The Proceedings of Conference of Kansai Branch   2004   
We investigated the decomposition of CF_4 in an exhaust gas from semiconductor manufacturing equipment using the inductively coupled plasma (ICP) reactor with RF power supply. The purpose of this study is to develop the PFC_S removal system which ...
HARUNA Shunji, FUJISHIMA Hidekatsu, KUROKI Tomoyuki, OKUBO Masaaki, YAMAMOTO Toshiaki
The Proceedings of Conference of Kansai Branch   2004   
The purpose of this study is NO_X removal in the exhaust gas by using the nonthermal plasma process. We investigated two-type plasma method; one is the direct plasma method, the other is the remote plasma method. They were compared for the purpose...
Tanaka Shingo, Kuroki Tomoyuki, Okubo Masaaki, Yamamoto Toshiaki, Ikeda Kei
The Proceedings of Conference of Kanto Branch   2004   
We investigated the decomposition of CF_4 in an exhaust gas from semiconductor manufacturing equipment using the inductively coupled plasma (ICP) reactor with RF power supply. The purpose of this study is to develop the PFCs removal system which c...
ARITA Naoki, OKUBO Masaaki, KUROKI Tomoyuki, YAMAMOTO Toshiaki
The Proceedings of the Symposium on Environmental Engineering   2004   
In recent years, the air pollution problems and the influence to human which is caused by NOx and PM from diesel engine exhaust gas become severe social problems. More effective post-processing technology is desired on PM, such as carbon soots. Al...
MORITA Yoshifumi, KUROKI Tomoyuki, OKUBO Masaaki, Yamamoto Tosiaki
The Proceedings of Conference of Kansai Branch   2003   
The industrial electrostatic precipitatiors (ESPs) employ negative corona or point corona, which generates discrete discharge along the wire electrodes. Three-dimensional analysis of electrical characteristics and electrohydrodynamics is essential...
ODAHARA Satoshi, YASUDA Ryuusuke, OKUBO Msaaki, YAMAMOTO Toshiaki
The Proceedings of Conference of Kansai Branch   2003   
It is known that fine particles can penetrate into the alveolus of the human lung and influence human health. However, it is not well understood how close to the human face aerosols can reach the nose. In order to elucidate the aerosol behavior in...
Tsujimoto Shinya, Watanabe Hirotoshi, Kuroki Tomoyuki, Okubo Masaaki, Yamamoto Toshiaki
The Proceedings of Conference of Kansai Branch   2003   
The coolant oil, which was widely used for machining various metal pieces from various industries, neads to clean before reuse it. The present study focused on the coolant oil treatment for machining aluminum using electrochemical methods. More th...
TANAKA Shingo, MINE Junko, KUROKI Tomoyuki, OKUBO Masaaki, YAMAMOTO Toshiaki, SAEKI Noboru
The Proceedings of Conference of Kansai Branch   2003   
CF_4 is one of the most stable gases among semiconductor processing gases and their decomposition is extremely difficult. Influence of frequency of radio frequency (RF) power on decomposition of CF_4 using inductively coupled plasma (ICP) reactor ...
AKEI Masahiro, TAKAHASHI Masayoshi, KUROKI Tomoyuki, OKUBO Masaaki, YAMAMOTO Toshiaki
The Proceedings of Conference of Kansai Branch   2003   
Simultaneous removal of NOx, SOx and particulates using nonthermal plasma-chemical hybrid reactor has been studied. The nonthermal plasma is used to oxidize NO to NO_2. NO_2 is reduced to N_2 and Na_2SO_4 by using Na_2SO_3 solution and SO_2 combin...
ISHIDATE Motoki, UMEI Shinsuke, KUROKI Tomoyuki, OKUBO Masaaki, YAMAMOTO Toshiaki
The Proceedings of Conference of Kansai Branch   2003   
Hydrophilic monomers are graft-polymerized to the surface of cloth after the plasma application. The characteristics of cloth changes to breathe moisture and to increase the adsorption of offensive odor simultaneously. In the present study, odor c...
Watanabe Hirotoshi, Morita Shingo, Kuroki Tomoyuki, Okubo Masaaki, Yamamoto Toshiaki
The Proceedings of Conference of Kansai Branch   2002   
The electrode of the electric air cleaner used in smoking places, such as an airport, is periodically washed by the alkaline solvent. The waste fluid had become muddy black in nicotin of cigarette etc., and since it was not able to be drained as i...
Ryo Masahiro, Saito Tomonobu, Okubo Masaki, Yamamoto Toshiaki
The Proceedings of Conference of Kansai Branch   2002   
Particulate matters less than 2.5μm (PM_<2.5>) are lately focused attention for human health. Numerical simulations were carried out to investigate the two-dimensional, time-dependent air flow and the motion of particulate matters including human ...
Nishino Masaya, Kuroki Tomoyuki, Okubo Masaaki, Yamamoto Toshiaki
The Proceedings of Conference of Kansai Branch   2002   
The plasma reactor utilizing three different power supplies was investigated for their ability to control the NO_x emissions in the exhaust gas of a diesel engine. The reactors include AC energized pellet-bed reactor and two pulse (rotation spark ...
TAKAHASHI Masayoshi, NAKANO Nobuaki, KUROKI Tomoyuki, OKUBO Masaaki, YAMAMOTO Toshiaki
The Proceedings of Conference of Kansai Branch   2002   
Simultaneous removal of NO_x, SO_x and particles using a wet-type plasma-chemical hybrid reactor has been studied. NO is oxidized to NO_2 by the pulse corona plasma without producing reaction byproducts. NO_2 is effectively reduced to N_2 and Na_2...
Umei Shinsuke, Morita Yoshihumi, Saeki Noboru, Kuroki Tomoyuki, Okubo Masaaki, Yamamoto Toshiaki
The Proceedings of Conference of Kansai Branch   2002   
Hydrophilic monomers are graft-polymerized to the surface of cloth after the plasma application, the characteristics of cloth changes to breathe moisture and to increase the adsorption of offensive odor simultaneously. In the present study, an imp...
Nishino Masaya, Kitaura Kouichi, Kuroki Tomoyuki, Okubo Masaki, Yamamoto Toshiaki
The Proceedings of Conference of Kansai Branch   2001   
In this series of experiments a two-stage process utilising a plasma reactor and chemical scrubber were investigated for their ability to control the NOx emissions in the exhaust gas of a diesel engine.The first stage a non-thermal plasma reactor ...
TAKAHASHI Masayoshi, HAYAKAWA Kunihiro, KUROKI Tomoyuki, OKUBO Masaaki, YAMAMOTO Toshiaki
The Proceedings of Conference of Kansai Branch   2001   
The plasma-chemical hybrid process has been developed for complete NOx and SOx removal. In the plasma process, NOx is oxidized to NO_2 using nonthermal plasma. In the chemical process, NO_2 is reduced to N_2 and Na_2SO_4 using Na_2SO_3, and SO_2 i...
Tanioka Goichi, Kametaka Hideya, Okubo Masaaki, Kuroki Tomoyuki, Yamamoto Toshiaki
The Proceedings of Conference of Kansai Branch   2001   
The gas concentration for hazardous air pollutant emissions is generally low (in ppm levels) and the gas volume is large. When we try to treat low concentration gas, the size of the equipment becomes larger and the total operating cost becomes hig...
OKUBO Masaaki, MIYASHITA Takayuki, KITAURA Koichi, YAMAMOTO Toshiaki
The proceedings of the JSME annual meeting   2000   
Two-stage plasma and chemical reactors was tested for removal of NO_x in an exhaust gas of diesel engine. Previous experimental results shown that nonthermal plasma was able to oxidize NO to NO_2 with low power consumption but cannot convert NO_2 ...
Miyashita Takayuki, Kitaura Kouichi, Okubo Masaki, YAMAMOTO Toshiaki
The Proceedings of Conference of Kansai Branch   2000   
Two-stage plasma and chemical reactors was investigated for the control of NOx in an exhaust gas of diesel engine. Previous results was shown that nonthermal plasma was able to oxidize NO to NO_2 with low power consumption but cannot convert NO_2 ...
KUROKI Tomoyuki, MORITA Shingo, OKUBO Masaaki, YAMAMOTO Toshiaki
The Proceedings of Conference of Kansai Branch   2000   
The plasma combined electronic air cleaner which composed of collection of submicron particles and decomposition of acetaldehyde and ammonia was investigated, offensive odor of tobacco smoke. For acetaldehyde decomposition, about 90% of decomposit...
NAGAOKA Takao, HAYAKAWA Kunihiko, YAMAMOTO Tosiaki, OOKUBO Masaaki
The Proceedings of Conference of Kansai Branch   2000   
Two-stage plasma and chemical reactors have been developed for complete NOx and SOx removal. The nonthermal plasma is used to oxidize NO to NO_2 and NO_2 is reduced to N_2 and Na_2SO_4 using Na_2SO_3 or Na_2S scrubbing. And SO_2 is reduced to Na_2...
Yamamoto Yoshihiro, Kuroki Tomoyuki, Okubo Masaaki, Yamamoto Toshiaki
The Proceedings of Conference of Kansai Branch   2000   
The gas flow rate for hazardous air pollutant emissions is generally high and their concentrations are low (in ppm levels). When we try to treat the high-flow-rate and low concentration gas, the size of the equipment becomes large and the total op...
MATSUMOTO Yoshiyuki, OKUBO Masaaki, YAMAMOTO Toshiaki
The Proceedings of Conference of Kansai Branch   2000   
Lately, surface modification by plasma is one of the study which attracts a great deal of attention. It is known that surface energy of the glass or hydrophilic property on polymer increases with the application of plasma. We investigated the surf...
黒木 智之, 大久保 雅章, 山本 俊昭, 福元 英樹
エアロゾル科学・技術研究討論会 = Symposium on Aerosol Science & Technology   1 Jul 1999   
TAKAHASHI Hirokazu, OKUBO Masaaki, YAMASAKI Hiroyuki
電気学会研究会資料. FTE, 新エネルギー・環境研究会   4 Sep 1998   

Works

 
Environmental Protection Using Plasma
2000
MHD Fluid dynamics
1998

Research Grants & Projects

 
Decomposition of Hazardous Gases Using Nonequilibrium Plasm
0130 (Japanese Only)
Numerical Simulation on Flow and Power Generation Characteristics of Plasma MHD Power Generator
0028 (Japanese Only)
Study on Energy Conversion System Using Gas-liquid Two-phase Flow of Magnetic Fluid
0130 (Japanese Only)
Exhaust Gas Treatment using Plasma
0130 (Japanese Only)
Removal of PM, NOx Using Plasma
0130 (Japanese Only)