Hiroyuki Kogawa

Profile Information

Affiliation: Neutron Source Section, Materials and Life Science Division, J-PARC center, Japan Atomic Energy Agency

Degree: 博士(工学)(筑波大学)

J-GLOBAL ID: 200901003648012311
researchmap Member ID: 5000058675

Research Areas

Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Machine materials and mechanics /

Papers

Effect of inner wall cracking on the cavitation bubble formation in the mercury spallation target at J-PARC

Ariyoshi Gen, Saruta Koichi, Kogawa Hiroyuki, Futakawa Masatoshi, Maeno Koki*, Li Y.*, Tsutsui Kihei*

Proceedings of 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-20) (Internet), 1407-1420, Aug, 2023 Peer-reviewed
Development of the high-power spallation neutron target of J-PARC

Haga Katsuhiro, Kogawa Hiroyuki, Naoe Takashi, Wakui Takashi, Wakai Eiichi, Futakawa Masatoshi

Proceedings of 19th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-19) (Internet), 13, Mar, 2022 Peer-reviewed
New design of high power mercury target vessel of J-PARC

Wakui Takashi, Wakai Eiichi, Kogawa Hiroyuki, Naoe Takashi, Hanano Kohei*, Haga Katsuhiro, Shimada Tsubasa*, Kanomata Kenichi*

Materials Science Forum, 1024 145-150, Mar, 2021 Peer-reviewed
Effect of gas microbubble injection and narrow channel structure on cavitation damage in mercury target vessel

Naoe Takashi, Kinoshita Hidetaka, Kogawa Hiroyuki, Wakui Takashi, Wakai Eiichi, Haga Katsuhiro, Takada Hiroshi

Materials Science Forum, 1024 111-120, Mar, 2021 Peer-reviewed
Pressure wave induced sound measurement for diagnosing the operation status of the J-PARC pulsed spallation neutron source

Naoe Takashi, Kogawa Hiroyuki, Wakui Takashi, Teshigawara Makoto, Haga Katsuhiro, Futakawa Masatoshi

Nuclear Instruments and Methods in Physics Research A, 982 164566\_1-164566\_6, Dec, 2020 Peer-reviewed
New Design and Fabrication Technology Applied in Mercury Target Vessel #8 of J-PARC

Takashi Wakui, Eiichi Wakai, Hiroyuki Kogawa, Takashi Naoe, Kohei Hanano, Katsuhiro Haga, Hiroshi Takada, Tsubasa Shimada, Kenichi Kanomata

JPS Conference Proceedings, 28 081002-1-081002-6, Mar, 2020 Peer-reviewed
Mitigation of Cavitation Damage in J-PARC Mercury Target Vessel

Takashi Naoe, Hidetaka Kinoshita, Hiroyiki Kogawa, Takashi Wakui, Eiichi Wakai, Katsuhiro Haga, Hiroshi Takada

JPS Conference Proceedings, 28 081004-1-081004-6, Feb, 2020 Peer-reviewed
Water leakage due to the welding defect and improvement to reach 1-MW beam operation in the mercury target of J-PARC

H. Kogawa, T. Wakui, T. Naoe, K. Haga, H. Takada, M. Futakawa

Journal of Nuclear Science and Technology, Jan, 2020 Peer-reviewed
Pulsed Pressure Induced Cavitation Erosion in Mercury Narrow Channel Under Flowing Conditions

Takashi Naoe, Hiroyuki Kogawa, Nobuatsu Tanaka, Masatoshi Futakawa

Advanced Experimental Mechanics, 4 17-21, Aug, 2019 Peer-reviewed
Optimum Temperature for HIP Bonding Invar Alloy and Stainless Steel

Takashi Wakui, Hideaki Ishii, Takashi Naoe, Hiroyuki Kogawa, Katsuhiro Haga, Eiichi Wakai, Hiroshi Takada, Masatoshi Futakawa

MATERIALS TRANSACTIONS, 60(6) 1026-1033, Apr, 2019 Peer-reviewed
Numerical Study on the Potential of Cavitation Damage in a Lead–Bismuth Eutectic Spallation Target

Tao Wan, Takashi Naoe, Hiroyuki Kogawa, Masatoshi Futakawa, Hironari Obayashi, Toshinobu Sasa

Materials, 12(4) 681, Feb, 2019 Peer-reviewed
Ultrasonic inspection technique for weld part of mercury target vessel for spallation neutron source

Wakui Takashi, Wakai Eiichi, Naoe Takashi, Kogawa Hiroyuki, Haga Katsuhiro, Takada Hiroshi, Shintaku Yohei*, Li T.*, Kanomata Kenichi*

Choompa Techno, 30(5) 16-20, Oct, 2018
Study of elemental tests for gas trap and treatment system of spallation mercury target system of J-PARC

Eiichi WAKAI, Hidetaka Kinoshita, Takashi Wakui, Takashi Naoe, Kouhei Hanano, Hideyuki Nemoto, Katsuhiro Haga, Hiroyuki Kogawa, Hiroshi Takada, Hiroki Shiraishi …

Proceedings of 15th Annual Meeting of Particle Accelerator Societ of Japan (PASJ2018), THP044 900-903, Oct, 2018
Improvement of Fabrication Technologies and the Design of Spallation Mercury Target Vessel for Higher Power Operation

E. Wakai, T. Wakui, H. Kogawa, T. Naoe, W.H. Guan, H. Kinoshita, K. Hanano, K. Haga, H. Takada, M. Futakawa …

Proceedings of the 15th Annual Meeting of Particle Accelerator Society of Japan, 181-184, Aug, 2018 Peer-reviewed
Effect of welding on gigacycle fatigue strength of austenitic stainless steels

T. Naoe, T. Wakui, H. Kogawa, E. Wakai, Katsuhiro Haga, H. Takada

Advanced Experimental Mechanics, 3 123-128, Aug, 2018 Peer-reviewed
Recent Studied for Structural Integrity Evaluation and Defect inspection of J-PARC Spallation Neutron Source Target Vessel

Takashi Wakui, Eiichi Wakai, Takashi Naoe, Yohei Shintaku, Taiyu Li, Kazuya Murakami, Kenichi Kanomata, Hiroyuki Kogawa, Katsuhiro Haga, Hiroshi Takada …

Journal of Nuclear Materials, 506 3-11, Aug, 2018 Peer-reviewed
Cavitation damage in double-walled mercury target vessel

Takashi Naoe, Takashi Wakui, Hidetaka Kinoshita, Hiroyuki Kogawa, Katsuhiro Haga, Masahide Harada, Hiroshi Takada, Masatoshi Futakawa

Journal of Nuclear Materials, 506 35-42, Aug, 2018 Peer-reviewed
Optimization study on structural analyses for the J-PARC mercury target vessel

Wenhai Guan, Eiichi Wakai, Takashi Naoe, Hiroyuki Kogawa, Takashi Wakui, Katsuhiro Haga, Hiroshi Takada, Masatoshi Futakawa

Nuclear Instruments and Methods in Physics Research Section A, 894(21) 8-19, Jun, 2018 Peer-reviewed
Technical investigation on small water leakage incident occurrence in mercury target of J-PARC

Haga Katsuhiro, Kogawa Hiroyuki, Wakui Takashi, Naoe Takashi, Takada Hiroshi

Journal of Nuclear Science and Technology, 55(2) 160-168, Feb, 2018 Peer-reviewed
Materials and Life Science Experimental Facility at the Japan Proton Accelerator Research Complex I: Pulsed Spallation Neutron Source

Hiroshi Takada, Katsuhiro Haga, Makoto Teshigawara, Tomokazu Aso, Shin-Ichiro Meigo, Hiroyuki Kogawa, Takashi Naoe, Takashi Wakui, Motoki Ooi, Masahide Harada …

QUANTUM BEAM SCIENCE, 1(2) 8-1-8-26, Sep, 2017 Peer-reviewed

Misc.

Technical note for the cavitation damage inspection for interior surface of the mercury target vessel, 2; Damage depth measurement for cavitation erosion

Naoe Takashi, Wakui Takashi, Kinoshita Hidetaka, Kogawa Hiroyuki, Teshigawara Makoto, Haga Katsuhiro

JAEA-Technology 2023-022, 81, Jan, 2024
Optimization of mercury flow with microbubbles in the target-vessel design by means of machine learning

Kogawa Hiroyuki, Futakawa Masatoshi, Haga Katsuhiro, Tsuzuki Takayuki*, Murai Tetsuro*

JAEA-Technology 2022-023, 128, Nov, 2022
Technical note for the cavitation damage inspection for interior surface of the mercury target vessel, 1; Development of specimen cutting machine for remote handling

Naoe Takashi, Kinoshita Hidetaka, Wakui Takashi, Kogawa Hiroyuki, Haga Katsuhiro

JAEA-Technology 2022-018, 43, Aug, 2022
R&D on Mercury Target for Spallation Neutron Source to Improve the Durability under High Power Operation (1) Mechanism of Damage Mitigation Effects by Gas Bubbles and Damage Observation Results

粉川広行, 川島広之, 有吉玄, 涌井隆, 猿田晃一, 直江崇, 羽賀勝洋, 二川正敏, 祖山均, 久慈千栄子 …

日本原子力学会秋の大会予稿集(CD-ROM), 2022, 2022
J‐PARC核破砕中性子源における陽子ビームの形状及び入射位置の変化が水銀ターゲットの核特性及び構造強度に及ぼす影響(2)水銀ターゲットにおける核発熱及び中性子実験装置へ供給する冷熱中性子強度

原田正英, 粉川広行, 直江崇, 涌井隆, 羽賀勝洋, 明午伸一郎, 大井元貴, 高田弘

日本原子力学会秋の大会予稿集(CD-ROM), 2018 ROMBUNNO.2A19, Aug 20, 2018
Status of design and fabrication of mercury target vessel (module) with partial constraint free for power uprates of pulsed spallation neutron source of J-PARC

若井栄一, 粉川広行, 涌井隆, 直江崇, 管文海, 花野耕平, 木下秀孝, 成井紀男, 羽賀勝洋, 勅使河原誠 …

量子ビームサイエンスフェスタ(Web), 2017, 2018
大強度化運転に向けた水銀ターゲット容器の製作技術に関するR&Dの最近の状況

若井栄一, 涌井隆, 粉川広行, 直江崇, GUAN Wenhai, 羽賀勝洋, 芹澤久, 森裕章, 堀口克彦, 高田弘 …

日本加速器学会年会(Web), 14th, 2017
J‐PARC核破砕中性子源ターゲット機器類の損傷挙動予測

若井栄一, 直江崇, 勅使河原誠, 涌井隆, 粉川広行, 羽賀勝洋, 高田弘

日本中性子科学会年会講演概要集, 17th 56, 2017
大強度化のためのJ‐PARC水銀ターゲット容器の製作技術の現状

涌井隆, 若井栄一, 粉川広行, 直江崇, 羽賀勝洋, 高田弘

日本中性子科学会年会講演概要集, 17th 56, 2017
J‐PARC核破砕中性子源の水銀標的容器に対するフェーズドアレイ超音波探傷器などの非破壊検査による欠陥調査研究

若井栄一, 涌井隆, 粉川広行, 直江崇, 荘司政行, 石川和義, 安一三, 勅使河原誠, 花野耕平, 成井紀男 …

日本非破壊検査協会秋季講演大会講演概要集, 2016 187‐188, Oct 6, 2016
In-situ structural integrity evaluation for high-power pulsed spallation neutron source by using a laser Doppler method

Wan T., Naoe Takashi, Wakui Takashi, Haga Katsuhiro, Kogawa Hiroyuki, Futakawa Masatoshi

JAEA-Conf 2015-002, 76-87, Feb, 2016
Progress of target system operation at the pulsed spallation neutron source in J-PARC

Takada Hiroshi, Naoe Takashi, Kai Tetsuya, Kogawa Hiroyuki, Haga Katsuhiro

Proceedings of 12th International Topical Meeting on Nuclear Applications of Accelerators (AccApp '15), 297-304, Jan, 2016
(4)高強度パルス中性子源実現のためのマイクロバブルを利用した液体金属中の圧力波抑制技術の開発(技術,日本機械学会賞〔2014年度(平成26年度)審査経過報告〕)

二川正敏, 羽賀勝洋, 粉川広行, 涌井隆, 直江崇

日本機械学会誌, 118(1158) 266-266, 2015
Study on the structural integrity of beam window for TEF target

Takei Hayanori, Obayashi Hironari, Iwamoto Hiroki, Kogawa Hiroyuki, Sasa Toshinobu

Proceedings of 11th International Topical Meeting on Nuclear Applications of Accelerators (AccApp '13), 311-316, May, 2014
133 Structure analysis of LBE spallation target for accelerator driven system in JAEA : Effects of pressure waves on the structural integrity of target vessel

Wan Tao, Kogawa Hiroyuki, Iwamoto Hiroki, Takei Hayanori, Obayashi Hironari, Sasa Toshinobu, Naoe Takashi, Futakawa Masatoshi

The Proceedings of Autumn Conference of Tohoku Branch, 2014 27-28, 2014
Study on numerical simulation of bubble and dissolved gas behavior in liquid metal flow

Ito Kei, Ohno Shuji, Kamide Hideki, Kogawa Hiroyuki, Futakawa Masatoshi, Kawamura Takumi*, Imai Yasutomo*

JAEA-Research 2013-008, 2013(8) 117-2,1-117, Oct, 2013
Effects of gas bubbles in a liquid on negative pressure and cavitation inception

Ida Masato, Kogawa Hiroyuki, Naoe Takashi, Haga Katsuhiro, Wakui Takashi

NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan, 62, 2013
Techniques on cavitation damage mitigation and diagnostics for the JSNS mercury target vessel:(3) Effects of microbubbles on dynamic behavior of the target vessel

Naoe Takashi, Wakui Takashi, Kogawa Hiroyuki, Haga Katsuhiro, Meigo Shinichiro, Teshigawara Makoto, Futakawa Masatoshi, Takada Hiroshi

Proceedings of AESJ, 2013, 2013
Development of the high power mercury target and the bubbler installation

Haga Katsuhiro, Kogawa Hiroyuki, Wakui Takashi, Naoe Takashi, Futakawa Masatoshi

Proceedings of 20th Meeting of the International Collaboration on Advanced Neutron Sources (ICANS-20) (USB Flash Drive), 6, Mar, 2012
Impact pressure mitigation in mercury target for pulsed spallation neutron sources

Futakawa Masatoshi, Naoe Takashi, Kogawa Hiroyuki

Proceedings of 7th International Symposium on Impact Engineering (ISIE 2010) (CD-ROM), 246-255, Jul, 2010

Presentations

Effect of inner wall penetration on the flow field in double-walled structure channel

Maeno Koki*, Ariyoshi Gen, Saruta Koichi, Murata Atsushi*, Kogawa Hiroyuki, Li Y.*, Tsutsui Kihei*, Futakawa Masatoshi

International Workshop on Advanced Experimental Mechanics for Students and Young Researchers 2023 (IWAEM'23)
Updates on the operation of the MLF neutron target at J-PARC and perspectives for future operation

Haga Katsuhiro, Naoe Takashi, Wakui Takashi, Kogawa Hiroyuki, Saruta Koichi, Kinoshita Hidetaka, Teshigawara Makoto, Harada Masahide, Sakai Kenji

8th High Power Targetry Workshop (HPTW2023)
Present status of cavitaion damage mitigation techiques for the mercury target veesel of J-PARC pulsed spallation neutron source

Naoe Takashi, Kogawa Hiroyuki, Wakui Takashi, Saruta Koichi, Teshigawara Makoto, Kinoshita Hidetaka, Haga Katsuhiro

8th High Power Targetry Workshop (HPTW2023)
Effect of the inner wall damage on a flow field in a double-walled structure mercury target

Maeno Koki*, Ariyoshi Gen, Saruta Koichi, Murata Atsushi*, Kogawa Hiroyuki, Tsutsui Kihei*, Li Y.*, Futakawa Masatoshi

日本機械学会関東支部茨城ブロック2022年茨城講演会
Development of numerical prediction method for bubble coalescence phenomenon under the mercury flows

Ariyoshi Gen, Ito Kei*, Kogawa Hiroyuki, Futakawa Masatoshi

11th International Conference on Multiphase Flow (ICMF 2023)
Lifetime prediction of the neutron target vessel

Naoe Takashi, Kogawa Hiroyuki, Wakui Takashi, Haga Katsuhiro

2022年度量子ビームサイエンスフェスタ; 第14回MLFシンポジウム/第40回PFシンポジウム
Effect of inner wall craking on the mercury flow induced vibration

Maeno Koki*, Ariyoshi Gen, Tsutsui Kihei*, Saruta Koichi, Kogawa Hiroyuki, Li Y.*, Futakawa Masatoshi

International Workshop on Advanced Experimental Mechanics for Students and Young Researchers 2022 (IWAEM' 22)
R\&D on mercury target for spallation neutron source to improve the durability under high power operation, 3; Experimental observation of bubble coalescence phenomenon and development of numerical prediction code

Ariyoshi Gen, Ito Kei*, Kogawa Hiroyuki, Futakawa Masatoshi

日本原子力学会2022年秋の大会
R\&D on mercury target for spallation neutron source to improve the durability under high power operation, 5; Application of anomaly detection and diagnosis for structural integrity evaluation of a mercury target vessel

Saruta Koichi, Murata Atsushi*, Maeno Koki*, Wakui Takashi, Naoe Takashi, Kogawa Hiroyuki, Li Y.*, Teshigawara Makoto, Haga Katsuhiro, Futakawa Masatoshi

日本原子力学会2022年秋の大会
R\&D on mercury target for spallation neutron source to improve the durability under high power operation, 2

Kawashima Hiroyuki, Kogawa Hiroyuki, Futakawa Masatoshi, Soyama Hitoshi*, Kuji Chieko*, Tanaka Nobuatsu*

日本原子力学会2022年秋の大会
R\&D on mercury target for spallation neutron source to improve the durability under high power operation, 1; Mechanism of damage mitigation effects by gas bubbles and damage observation results

Kogawa Hiroyuki, Kawashima Hiroyuki, Ariyoshi Gen, Wakui Takashi, Saruta Koichi, Naoe Takashi, Haga Katsuhiro, Futakawa Masatoshi, Soyama Hitoshi*, Kuji Chieko*, Ito Kei*, Tanaka Nobuatsu*

日本原子力学会2022年秋の大会
Feasibility study of applying phased array ultrasonic method to weld inspection of mercury target vessel for spallation neutron source

Wakui Takashi, Wakai Eiichi, Naoe Takashi, Kogawa Hiroyuki, Haga Katsuhiro, Zhou Y.*, Kobayashi Akihiko*

第26回超音波による非破壊評価シンポジウム
Nuclear heat and cold-thermal neutron intensity dependence on proton beam profile and incident position at the J-PARC spallation neutron source

Harada Masahide, Kogawa Hiroyuki, Naoe Takashi, Wakui Takashi, Haga Katsuhiro, Meigo Shinichiro, Oi Motoki, Takada Hiroshi

日本中性子科学会第18回年会(JSNS 2018)
Optimization of the swirl gas microbubble generator for a liquid mercury target vessel

Ikeda Tsubasa, Kogawa Hiroyuki, Naoe Takashi, Kawamura Shunsuke, Tanaka Nobuatsu*, Futakawa Masatoshi

13th International Symposium on Advanced Science and Technology in Experimental Mechanics (13th ISEM'18)
Effect of proton beam profile and incident position on neutronic performance and structural integrity of a mercury target of the spallation neutron source at J-PARC, 1; Structural integrity of mercury target vessel

Kogawa Hiroyuki, Naoe Takashi, Wakui Takashi, Haga Katsuhiro, Harada Masahide, Meigo Shinichiro, Oi Motoki, Takada Hiroshi

日本原子力学会2018年秋の大会
Effect of proton beam profile and incident position on neutronic performance and structural integrity of a mercury target of the spallation neutron source at J-PARC, 2; Nuclear heat of mercury target and cold-thermal neutron intensity provided to neutron instrument

Harada Masahide, Kogawa Hiroyuki, Naoe Takashi, Wakui Takashi, Haga Katsuhiro, Meigo Shinichiro, Oi Motoki, Takada Hiroshi

日本原子力学会2018年秋の大会
Experimental evaluation of characteristics of the microbubble generator using swirl flow

Ikeda Tsubasa, Kogawa Hiroyuki, Naoe Takashi, Kawamura Shunsuke, Tanaka Nobuatsu*, Futakawa Masatoshi

日本機械学会関東支部茨城ブロック2018年茨城講演会
Target system maintenance experience in hot cell at J-PARC

Kinoshita Hidetaka, Haga Katsuhiro, Kai Tetsuya, Wakui Takashi, Kogawa Hiroyuki, Teshigawara Makoto, Naoe Takashi, Takada Hiroshi

7th High Power Targetry Workshop
Progress of specimen cutout and damage inspection for used mercury target vessel at J-PARC

Naoe Takashi, Kinoshita Hidetaka, Wakui Takashi, Kogawa Hiroyuki, Haga Katsuhiro, Takada Hiroshi

7th High Power Targetry Workshop
Non-destructive inspection technique for weld part of mercury target vessel

Wakui Takashi, Wakai Eiichi, Naoe Takashi, Kogawa Hiroyuki, Haga Katsuhiro, Takada Hiroshi

2017年度量子ビームサイエンスフェスタ; 第9回MLFシンポジウム/第35回PFシンポジウム

Professional Memberships

Research Projects

Comprehensive study on mercury cavitation by proton beam-induced pressure waves and its mitigation techniques

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Japan Society for the Promotion of Science, Apr, 2011 - Mar, 2015

FUTAKAWA Masatoshi, KYOTOH Harumichi, OKITA Kohei, HAGA Katsuhiro, KOGAWA Hiroyuki, NAOE Takashi, WAKUI Takashi, HASEGAWA Shoichi, MATSUMOTO Yoichiro, KANEKO Akiko, TANAKA Nobuatsu, SATO Harumichi, WATANABE Masao
Elucidation on microbubble mitigation mechanism for pressure waves induced by proton beam bombardment

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Japan Society for the Promotion of Science, 2008 - 2010

FUTAKAWA Masatoshi, HASEGAWA Shoichi, KANEKO Akiko, HAGA Katsuhiro, KOGAWA Hiroyuki, IDA Masato, NAOE Takashi, MATSUMOTO Yoichiro, OKITA Kohei, TANAKA Nobuatsu, TAKEMURA Fumio, OKAMOTO Koji, MURAI Yuichi
Development of damage mitigation technique on liquid/solid interface by microbubble

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Japan Society for the Promotion of Science, 2005 - 2006

FUTAKAWA Masatoshi, MATSUMOTO Yoichiro, HASEGAWA Shoichi, KOGAWA Hiroyuki, OKITA Kohei, FUJIWARA Akiko

Industrial Property Rights

5594680 液体金属ターゲット用旋回流型マイクロバブル発生装置および流体装置

粉川広行, 二川正敏, 直江崇, 羽賀勝洋, 長谷川勝一, 阿部敏達*, 浦野裕太*
5257881 中空金属焼結体、それを利用した中性子源液体金属ターゲット用バブラー及びその製造方法

二川正敏, 粉川広行, 羽賀勝洋, 直江崇, 栗下裕明*, アハメドブチリ*, 前川克廣*, 加藤昌宏*
5245172 平準化磁界形成機構を有する磁場回転式電磁ポンプ

粉川広行, 二川正敏, 羽賀勝洋, 涌井隆, 三浦邦明*, 浅葉信*, 武野尚文*, 小笠原俊彦*, 萩谷和彦*
5105239 逆流防止機能を有する磁場回転式電磁ポンプ

粉川広行, 二川正敏, 羽賀勝洋, 涌井隆, 三浦邦明*, 浅葉信*, 武野尚文*, 小笠原俊彦*, 萩谷和彦*
2007-016273 オーステナイト系ステンレス鋼部品の階層表面改質法

粉川広行, 直江崇, 池田裕二郎, 二川正敏, 竹内博次*, 玉本圭司*, 永田浩*, 北田智也*
2006-084241 核破砕中性子源水銀ターゲット容器の診断方法及び装置

二川正敏, 勅使河原誠, 粉川広行, 池田裕二郎, not registered, not registered
H16-309410 電磁式衝撃加力によるキャビテーション発生装置、その装置による材料の損傷評価試験方法、及び材料の表面改質方法

粉川広行, 二川正敏, 池田裕二郎, not registered, not registered

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