hatakeyama masahiko 畠山賢彦

… Alternative Names

HATAKEYAMA Masahiko 畠山賢彦

Less

Researcher Number	30375109
Other IDs	https://orcid.org/0000-0003-4823-4466
Affiliation (Current)	2023: 富山大学, 学術研究部都市デザイン学系, 准教授
Affiliation (based on the past Project Information) *help	2019 – 2022: 富山大学, 学術研究部都市デザイン学系, 准教授 2018: 富山大学, 大学院理工学研究部(都市デザイン学), 准教授 2014 – 2017: 富山大学, 大学院理工学研究部(工学), 准教授 2007 – 2013: Tohoku University, Institute for Materials Research, Research Associate 2004 – 2006: Tohoku University, IMR, International research center for nuclear materials science, Research associate, 金属材料研究所, 助手
Review Section/Research Field	Principal Investigator Nuclear fusion studies / Basic Section 26050:Material processing and microstructure control-related / Nuclear engineering Except Principal Investigator Nuclear engineering / Basic Section 14020:Nuclear fusion-related / Science and Engineering / Engineering / Nuclear fusion studies / Metal making engineering / Nuclear fusion studies … More / Physical properties of metals / Condensed matter physics I / Basic Section 32010:Fundamental physical chemistry-related / Basic Section 26050:Material processing and microstructure control-related Less
Keywords	Principal Investigator 照射 / ステンレス鋼 / 転位 / 偏析 / マグネシウム合金 / 腐食 / 応力腐食割れ / 原子炉 / 原子炉シュラウド / 照射誘起偏析 … More / 析出物 / 照射損傷 / 界面 / シンク / 銅合金 / ボイド / 転位ループ / 鈴木偏析 / 3DAP / 格子欠陥 / 腐食特性 / 防食技術 / 電気化学 / 防食 / 金属間化合物 / マグネシウム … More Except Principal Investigator 陽電子消滅 / 3次元アトムプローブ / 照射脆化 / タングステン / 原子炉圧力容器鋼 / アトムプローブ / ナノクラスター / 粒界偏析 / 格子欠陥 / 室温延性 / 機械的性質 / 水素 / 照射脆化機構 / 照射促進ナノ析出物 / 照射誘起ナノ析出物 / 原子炉圧力容器 / 高経年化原子炉 / 粒界・界面偏析 / 照射欠陥 / 照射脆脆化 / ナノ析出物 / 局所電極型アトムプローブ / シュラウド応力腐食割れ / 炭化チタン / 再結晶・粒成長組織 / 結晶粒界 / 塑性加工 / 超塑性 / 微細結晶粒 / 再結晶.粒成長組織 / 靭性 / 超微細粒 / 音響キャビテーション / 音響毛管現象 / 転写性 / 超音波振動 / 鋳造工学 / 炭化物 / 原子力エネルギー / 集束イオンビーム / 粒界脆化 / 原子炉高経年化 / 応力腐食割れ / 真空破面蒸着 / レーザー / 電子炉高経年化 / 照射誘起粒界析出 / 照射誘起マルテンサイト変態 / 超微細結晶粒 / 分散粒子 / 高エネルギー粒子照射 / 照射損傷 / 照射硬化 / 結晶粒 / メカニカルアロイング / 中性子照射 / 組織制御 / シンク密度 / 再結晶温度 / 微細結晶粒・粒子分散 / Mo_2C / WC / 析出 / 燒結 / 脆化 / radiation-induced precipitation / radiation-induced martensitic transformation / ultra-fine grain / dispersoids / high energetic perticle irradiation / radiation damage / radiation embrittlement / radiation hardening / 空孔-溶質複合体 / 3次元アトムプロープ / Positron Annhilation / 3D Atom Probe / Nano Cluster / Vacancy-Solute Complex / ポジトロニウム / ガラス / ナノボイド / 第一原理計算 / positronium / glass / Nanovoids / first-principles calculation / 金属材料 / 核融合 / 水素脆化 / 金属 / 水膜試験法 / 防錆油 / 電位自励発振 / マグネシウム合金 / 水膜試験 / 焼結材料 / 某製油 / 腐食 / 機械的特性 / 微小試験 / 粒子線照射 / ナノコンポジット膜 / 窒化物膜 / PVD法 / 高温酸化 / 微細組織 / ナノ複相構造膜 / 拡散 Less

β相およびAl-rich-α相の形態制御による高耐食性Mg-Al-X合金の開発Principal Investigator
- Principal Investigator
  
  畠山賢彦
- Project Period (FY)
  2022 – 2024
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Review Section
  
  Basic Section 26050:Material processing and microstructure control-related
- Research Institution
  University of Toyama
粒子線照射したタングステンの水素添加による機械的特性変化の評価とメカニズム解明
- Principal Investigator
  
  佐藤紘一
- Project Period (FY)
  2021 – 2023
- Research Category
  
  Grant-in-Aid for Scientific Research (B)
- Review Section
  
  Basic Section 14020:Nuclear fusion-related
- Research Institution
  Kagoshima University
Creation of super heat-resisting hard coatings by elucidation of mechanisms of detarioration at high temperature for nanocomposite coatings
- Principal Investigator
  
  野瀬正照
- Project Period (FY)
  2021 – 2023
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Review Section
  
  Basic Section 26050:Material processing and microstructure control-related
- Research Institution
  University of Toyama
Study of corrosion protection mechanism using electrical potential oscillation on interface between oil and water
- Principal Investigator
  
  砂田聡
- Project Period (FY)
  2019 – 2022
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Review Section
  
  Basic Section 32010:Fundamental physical chemistry-related
- Research Institution
  University of Toyama
Non-destructive quantitative estimation of hydrogen trapped at lattice defects in metals using positron annihilation spectroscopy
- Principal Investigator
  
  Sato Koichi
- Project Period (FY)
  2018 – 2020
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Review Section
  
  Basic Section 14020:Nuclear fusion-related
- Research Institution
  Kagoshima University
Search for novel highly corrosion-resistant Mg-Al-X alloy by suppressing Al-rich alpha phasePrincipal Investigator
- Principal Investigator
  
  Hatakeyama Masahiko
- Project Period (FY)
  2018 – 2021
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Review Section
  
  Basic Section 26050:Material processing and microstructure control-related
- Research Institution
  University of Toyama
TEM and 3DAP characterization of solute-dislocation interactionsPrincipal Investigator
- Principal Investigator
  
  Hatakeyama Masahiko
- Project Period (FY)
  2014 – 2017
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Nuclear fusion studies
- Research Institution
  University of Toyama
Investigation of mechanism for enhancement on recombination of point deffects at controlled precipitate/matrix interfacePrincipal Investigator
- Principal Investigator
  
  MASAHIKO HATAKEYAMA
- Project Period (FY)
  2011 – 2012
- Research Category
  
  Grant-in-Aid for Young Scientists (B)
- Research Field
  
  Nuclear fusion studies
- Research Institution
  Tohoku University
Atomic scale observation of grain boundary segregation in nuclear materials by atom probe tomography and study on mechanism of grain boundary degradation
- Principal Investigator
  
  NAGAI Yasuyoshi
- Project Period (FY)
  2009 – 2011
- Research Category
  
  Grant-in-Aid for Scientific Research (A)
- Research Field
  
  Nuclear engineering
- Research Institution
  Tohoku University
Nano-carbides and carbide-matrix interfaces in nuclear reactor pressure vessel steel studied by 3D-AP
- Principal Investigator
  
  TOYAMA Takeshi
- Project Period (FY)
  2008 – 2009
- Research Category
  
  Grant-in-Aid for Young Scientists (Start-up)
- Research Field
  
  Nuclear engineering
- Research Institution
  Tohoku University
Toughness enhancement of ultra-fine grained W-TiC for fusion divertor applications
- Principal Investigator
  
  KURISHITA Hiroaki
- Project Period (FY)
  2007 – 2008
- Research Category
  
  Grant-in-Aid for Scientific Research (B)
- Research Field
  
  Nuclear fusion studies
- Research Institution
  Tohoku University
Fundamental study on solidification behaviors of molten alloy under ultrasonic field for fine precision casting.
- Principal Investigator
  
  TAMURA Satoshi
- Project Period (FY)
  2007 – 2008
- Research Category
  
  Grant-in-Aid for Young Scientists (B)
- Research Field
  
  Metal making engineering
- Research Institution
  National Fisheries University
  The University of Tokyo
Positronium Study of Structural Nanovoids in Model Glasses
- Principal Investigator
  
  INOUE Koji
- Project Period (FY)
  2006 – 2007
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Condensed matter physics I
- Research Institution
  Tohoku University
Clarification of Embrittlement and Degradation Mechanisms of NuclearSteel Materials by Advanced Nano-Materials Science for Control and Prediction of theMaterials Integrity
- Principal Investigator
  
  HASEGAWA Masayuki
- Project Period (FY)
  2005 – 2009
- Research Category
  
  Grant-in-Aid for Specially Promoted Research
- Review Section
  
  Science and Engineering
  Engineering
- Research Institution
  Tohoku University
原子炉ステンレス鋼の応力腐食割れにおける照射欠陥・超微小析出物偏析の効果Principal Investigator
- Principal Investigator
  
  畠山賢彦
- Project Period (FY)
  2005 – 2006
- Research Category
  
  Grant-in-Aid for Young Scientists (B)
- Research Field
  
  Nuclear engineering
- Research Institution
  Tohoku University
原子炉圧力容器鋼中の照射誘起ナノ析出物および欠陥の形成・発達過程の解明と制御
- Principal Investigator
  
  HASEGAWA Masayuki
- Project Period (FY)
  2003 – 2007
- Research Category
  
  Grant-in-Aid for Scientific Research (S)
- Research Field
  
  Nuclear engineering
- Research Institution
  Tohoku University
Study of Nano-Clustering Mechanism by Positron Annihilation and 3D Atom Probe
- Principal Investigator
  
  NAGAI Yasuyoshi
- Project Period (FY)
  2003 – 2005
- Research Category
  
  Grant-in-Aid for Scientific Research (B)
- Research Field
  
  Physical properties of metals
- Research Institution
  Tohoku University
Improvement in radiation resistance in refractory transition metals such as tungsten by radiation induced ductilization
- Principal Investigator
  
  KURISHITA Hiroaki
- Project Period (FY)
  2001 – 2004
- Research Category
  
  Grant-in-Aid for Scientific Research (A)
- Research Field
  
  Nuclear fusion studies
- Research Institution
  Tohoku University

[Journal Article] In-situ observation of damage structure in Cu-Cr-Zr and Cu-Cr alloy during 1.25?MeV electron irradiation2022
- Author(s)
  Hatakeyama M.、Yamamoto T.、Yasuda K.、Matsumura S.、Yasunaga K.、Sato K.
- Journal Title
  
  Nuclear Materials and Energy
  
  Volume: 30 Pages: 101144-101144
- DOI
  10.1016/j.nme.2022.101144
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-18K04774
[Journal Article] Change in nanoindentation hardness of polycrystalline tungsten irradiated with Fe ions or electrons by hydrogen gas charging2022
- Author(s)
  Koichi Sato, Ryuta Kasada, Atsushi Kiyohara, Masashi Hirabaru, Kenichi Nakano, Kiyohiro Yabuuchi, Masahiko Hatakeyama, Qiu Xu
- Journal Title
  
  Journal of Nuclear Materials
  
  Volume: 560 Pages: 153483-153483
- DOI
  10.1016/j.jnucmat.2021.153483
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-21H01068, KAKENHI-PROJECT-20K03900
[Journal Article] The Effect of Base Oil Viscosity on the Corrosion Preventive Properties of the Rust Preventive Oils2022
- Author(s)
  Kume Mochisuke、Iwashima Daisuke、Hatakeyama Masahiko、Sunada Satoshi
- Journal Title
  
  MATERIALS TRANSACTIONS
  
  Volume: 63 Issue: 5 Pages: 716-719
- DOI
  10.2320/matertrans.mt-ma2022001
  10.2320/matertrans.MT-MA2022001
- ISSN
  1345-9678, 1347-5320
- Language
  English
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-18K04774, KAKENHI-PROJECT-19K05370
[Journal Article] Corrosion Properties of the β-Mg<sub>17</sub>Al<sub>12</sub> Phase in NaCl Solutions2022
- Author(s)
  Sarayama Kaede、Nakano Kenichi、Shimada Yusuke、Morihiro Ami、Hatakeyama Masahiko、Sunada Satoshi、Sato Koichi
- Journal Title
  
  MATERIALS TRANSACTIONS
  
  Volume: 63 Issue: 6 Pages: 911-917
- DOI
  10.2320/matertrans.mt-ma2022023
  10.2320/matertrans.MT-MA2022023
- ISSN
  1345-9678, 1347-5320
- Language
  English
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-18K04774
[Journal Article] Influence of Iron Diffusion on the Oxidation Resistance of CrSiCN Hard Coatings2022
- Author(s)
  Hatakeyama Masahiko、Tsuchiya Taiki、Lee Seung-won、Matsuda Kenji、Aoi Yoshifumi、Nose Masateru
- Journal Title
  
  MATERIALS TRANSACTIONS
  
  Volume: 63 Issue: 4 Pages: 422-429
- DOI
  10.2320/matertrans.mt-ma2022014
  10.2320/matertrans.MT-MA2022014
- NAID
  130008164776
- ISSN
  1345-9678, 1347-5320
- Language
  English
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-18K04774, KAKENHI-PROJECT-21K04720
[Journal Article] Effect of Sigma Phase on Corrosion Behavior of Duplex Stainless Steel2022
- Author(s)
  Nagae Koichiro、Ejiri Kento、Hirabayashi Jyunichi、Yamamoto Yuichi、Hatakeyama Masahiko、Sunada Satoshi
- Journal Title
  
  MATERIALS TRANSACTIONS
  
  Volume: 63 Issue: 5 Pages: 726-729
- DOI
  10.2320/matertrans.mt-ma2022002
  10.2320/matertrans.MT-MA2022002
- ISSN
  1345-9678, 1347-5320
- Language
  English
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-18K04774
[Journal Article] Effect of dispersion particles and precipitates on the corrosion properties of ODS-Cu, Cu-Cr-Zr and Cu-Cr alloys in Na2SO4 solutions2022
- Author(s)
  Hatakeyama Masahiko、Okada Kai、Sunada Satoshi、Sato Koichi
- Journal Title
  
  Nuclear Materials and Energy
  
  Volume: 31 Pages: 101159-101159
- DOI
  10.1016/j.nme.2022.101159
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-18K04774
[Journal Article] The role of β(Al12Mg17) phase on corrosion behavior of the AM90 alloy in NaCl aqueous solution2022
- Author(s)
  Hatakeyama M.、Shimada Y.、Kawate N.、Sarayama K.、Sunada S.
- Journal Title
  
  Archives of Metallurgy and Materials
  
  Volume: 67 Pages: 759-766
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-18K04774
[Journal Article] The role of β(Al12Mg17) phase on corrosion behavior of the AM90 alloy in NaCl aqueous solution2021
- Author(s)
  M. Hatakeyama, Y. Shimada, N. Kawate, K. Sarayama and S. Sunada
- Journal Title
  
  Archives of Metallurgy and Materials
  
  Volume: in press
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-18K04774
[Journal Article] Change in the positron annihilation lifetime of vacancy clusters containing hydrogen atoms in electron-irradiated F82H2021
- Author(s)
  Sato Koichi, Kondo Yohei, Ohta Masakiyo, Xu Qiu, Yabuuchi Atsushi, Kinomura Atsushi, Onoue Masahira, Onitsuka Takash,i Hatakeyama Masahiko, Iwakiri Hirotomo, Kato Daiji, Watanabe Yoshiyuki, Tanigawa Hiroyasu
- Journal Title
  
  Materials Science Forum
  
  Volume: 1024 Pages: 71-78
- DOI
  10.4028/www.scientific.net/msf.1024.71
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18K04774, KAKENHI-PROJECT-20K03902, KAKENHI-PROJECT-18K03584
[Journal Article] Corrosion Resistance of the Sintered Fe-Cu-C, Fe-Cu-Ni-Mo-C and Fe-Cr-Mo-C Alloys Coated with a Rust Preventive Oil2020
- Author(s)
  S. Sunada, M. Hatakeyama, K. Hibino, K. Tagishi, Y. Mizukoshi, S. Takeuchi, Y. Maekawa and N. Nagase
- Journal Title
  
  Materials Science Forum
  
  Volume: 985 Pages: 54-63
- DOI
  10.4028/www.scientific.net/msf.985.54
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18K04774
[Journal Article] Change in the Positron Annihilation Lifetime of Vacancies Containing Hydrogen Atoms in Electron-irradiated Tungsten2020
- Author(s)
  K. Sato, Y. Kondo, M. Ohta, A. Hirosako, M. Onoue, M. Hatakeyama, S. Sunada, Q. Xu
- Journal Title
  
  JPS Conference Proceeding
  
  Volume: 28 Pages: 061001-061001
- DOI
  10.7566/jpscp.28.061001
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-18K03584, KAKENHI-PROJECT-18K04774
[Journal Article] Effects of Sigma Phase on the Embrittlement Behavior of Super Duplex Stainless Steel F55 under SSRT with a Cathodic Charge2019
- Author(s)
  Yusuke Shimada, Masahiko Hatakeyama, Jyunichi Hirabayashi, Yuichi Yamamoto, Koichi Sato, Satoshi Sunada
- Journal Title
  
  MATERIALS TRANSACTIONS
  
  Volume: 60 Issue: 11 Pages: 2378-2386
- DOI
  10.2320/matertrans.mt-maw2019006
  10.2320/matertrans.MT-MAW2019006
- NAID
  130007733047
- ISSN
  1345-9678, 1347-5320
- Language
  English
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-18K04774
[Journal Article] Corrosion behaviors of the iron-based and Ni-based brazing filler metals brazed on the stainless steels in a solution of 3.5MASS% NaCl2018
- Author(s)
  Sunada Satoshi、Hataheyama Masahiko、Motoya Haruna、Nunomura Norio
- Journal Title
  
  Acta Metallurgica Slovaca
  
  Volume: 24 Pages: 88-99
- DOI
  10.12776/ams.v24i1.1025
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-26420850
[Journal Article] Effect of Sn, Zn and Bi Addition on Corrosion Characteristics of Magnesium Alloys Sintered by Spark Plasma Sintering2018
- Author(s)
  Satoshi Sunada, Yoshitaka Matsui, Syogo Takeuchi, Taku Iwaoka, Koichi Sato, Masahiko Hatakeyama
- Journal Title
  
  Materials Science Forum
  
  Volume: 941 Pages: 1760-1765
- DOI
  10.4028/www.scientific.net/msf.941.1760
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18K04774
[Journal Article] Quantitative evaluation of hydrogen atoms trapped at single vacancies in tungsten using positron annihilation lifetime measurements: Experiments and theoretical calculations2017
- Author(s)
  K .Sato, A. Hirosako, K. Ishibashi, Y. Miura, Q. Xu, M. Onoue, Y. Fukutoku, T. Onitsuka, M. Hatakeyama, S. Sunada, T. Yoshiie
- Journal Title
  
  Journal of Nuclear Materials
  
  Volume: 496 Pages: 9-17
- DOI
  10.1016/j.jnucmat.2017.09.002
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-15K06423, KAKENHI-PROJECT-26420850
[Journal Article] The Role of β(Al12Mg17) Phase on Corrosion Behavior of the AZ91 Alloy in NaCl Aqueous Solution2016
- Author(s)
  M. Hatakeyama, K. Shimono, D. Iwashima, S. Saikawa, S. Sunada
- Journal Title
  
  Archives of Metallurgy and Materials
  
  Volume: 62 Pages: 155-158
- DOI
  10.1515/amm-2017-0021
- Peer Reviewed / Acknowledgement Compliant / Open Access
- Data Source
  KAKENHI-PROJECT-26420850
[Journal Article] Effect of Heat-treatment on the Corrosion Resistance of AZ91 Coated with Aluminum Sputtering Film2016
- Author(s)
  Ryosuke Yoshita, Yosuke Ishibashi, Masahiko Hatakeyama, Masateru Nose, Satoshi Sunada
- Journal Title
  
  Chiang Mai Journal of Science
  
  Volume: 43 Pages: 420-424
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-26420850
[Journal Article] nfluence of β-Mg17Al12 Phase on Initial Pitting Process of AZ91D Magnesium Alloy2016
- Author(s)
  Masahiro Kaido, Kenta Imai, Masahiko Hatakeyama, Satoshi Sunada
- Journal Title
  
  Materials Science Forum
  
  Volume: 879 Pages: 1895-1898
- DOI
  10.4028/www.scientific.net/msf.879.1895
- Peer Reviewed / Acknowledgement Compliant
- Data Source
  KAKENHI-PROJECT-26420850
[Journal Article] Corrosion Properties of the Fe-Cr-Based Soft Magnetic Alloys Fabricated by Metal Injection Molding2016
- Author(s)
  Y. Hamataka, M. Hatakeyama, T. Osada, H. Miura, O. Iwatsu, S. Tanaka and S. Sunada
- Journal Title
  
  MATERIALS TRANSACTIONS
  
  Volume: 57 Issue: 12 Pages: 2110-2115
- DOI
  10.2320/matertrans.y-m2016833
  10.2320/matertrans.Y-M2016833
- NAID
  130005284501
- ISSN
  1345-9678, 1347-5320
- Language
  English
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-26420850
[Journal Article] Effects of Aluminum Sputtering on the Corrosion resistance of AZ91 Alloy2015
- Author(s)
  Y. Ishibashi, M. Nose, M. Hatakeyama, S. Sunada
- Journal Title
  
  Archives of Metallurgy and Materials
  
  Volume: 60 Pages: 953-955
- DOI
  10.1515/amm-2015-0237
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-26420850
[Journal Article] Study of Rust Preventive Characteristics of Rust Preventive Oil from Polarization Curve Measurement2015
- Author(s)
  D. Iwashima, K. Ejiri, N. Nagase, M. Hatakeyama, S. Sunada
- Journal Title
  
  Archives of Metallurgy and Materials
  
  Volume: 60 Pages: 915-917
- DOI
  10.1515/amm-2015-0229
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-26420850
[Journal Article] Rust Preventive Properties by Using Polarization Curve Measurement on the Metal Coated with the Rust Preventive Oil2014
- Author(s)
  Daisuke Iwashima, Sayaka Hirata, Naoki Nagase, Masahiko Hatakeyama and Satoshi Sunada
- Journal Title
  
  MATERIALS TRANSACTIONS
  
  Volume: 55 Issue: 11 Pages: 1762-1764
- DOI
  10.2320/matertrans.maw201417
  10.2320/matertrans.MAW201417
- NAID
  130004699245
- ISSN
  1345-9678, 1347-5320
- Language
  English
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-26420850
[Journal Article] Direct observation of solute-dislocation interaction on screw dislocation in a neutron irradiated modified 316 stainless steel2014
- Author(s)
  M.Hatakeyama, S. Tamura, I. Yamagata
- Journal Title
  
  Materials Letters
  
  Volume: 122 Pages: 301-305
- DOI
  10.1016/j.matlet.2014.01.109
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-23760804
[Journal Article] Direct Observation of Solute-dislocation Interaction on Extended Edge Dislocation in Irradiated austenitic stainless steel2014
- Author(s)
  M.Hatakeyama, I.Yamagata, Y.Matsukawa, S.Tamura
- Journal Title
  
  Philosophical Magazine Letters
  
  Volume: 94 Pages: 18-24
- DOI
  10.1080/09500839.2013.853135
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-22686058, KAKENHI-PROJECT-23760804
[Journal Article] Irradation-induced precipitates in V–4Cr–4Ti alloys studied using three-dimensional atom probe2013
- Author(s)
  M. Hatakeyama, T. Nagasaka, T. Muroga, T. Toyama and I. Yamagata
- Journal Title
  
  Journal of Nuclear Materials
  
  Volume: 442
- DOI
  10.1016/j.jnucmat.2013.01.320
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-23760804
[Journal Article] Irradiation-induced precipitation in a SUS316 stainless steel using three-dimensional atom probe2013
- Author(s)
  M. Hatakeyama, I. Yamagata
- Journal Title
  
  Journal of Nuclear Materials
  
  Volume: 422
- DOI
  10.1016/j.jnucmat.2012.11.048
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-23760804
[Journal Article] Grain boundary segregation in neutron-irradiated 304 stainless steel studied by atom probe tomography2012
- Author(s)
  T.Toyama, Y.Nozawa, W.Van Renterghem, Y.Matsukawa, M.Hatakeyama, Y.Nagai, A.Al Mazouzi, S.Van Dyck
- Journal Title
  
  J.Nucl.Mater.
  
  Volume: (未定)(In Press)
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-21246142
[Journal Article] Grain boundary segregation in neutron-irradiated 304 stainless steel studied by atom probe tomography2012
- Author(s)
  T. Toyama, Y. Nozawa, W. Van Renterghem, Y. Matsukawa, M. Hatakeyama, Y. Nagai, A. Al Mazouzi, S. Van Dyck
- Journal Title
  
  J. Nucl. Mater
  
  Volume: 425 Pages: 71-75
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-21246142
[Journal Article] Irradiation-induced Precipitates in a Neutron Irradiated 304 Stainless Steel Studied by Three-dimensional Atom Probe2011
- Author(s)
  T.Toyama, Y.Nozawa, W.Van Renterghem, Y.Matsukawa, M.Hatakeyama, Y.Nagai, A.Al Mazouzi, S.Van Dyck
- Journal Title
  
  Journal of Nuclear Materials
  
  Volume: 418 Pages: 62-68
- DOI
  10.1016/j.jnucmat.2011.07.027
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-21246142, KAKENHI-PROJECT-22686058, KAKENHI-PROJECT-23760822
[Journal Article] Positron Annihilation in Cr, Cu, and Au Layers Embedded in Al and Quantum Confinement of Positrons in Au Clusters2011
- Author(s)
  P.Pikart, C.Hugenschmidt, M.Horisberger, Y.Matsukawa, M.Hatakeyama, T.Toyama, Y.Nagai
- Journal Title
  
  Physical Review B
  
  Volume: 84 Pages: 14106-14106
- DOI
  10.1103/physrevb.84.014106
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-21246142, KAKENHI-PROJECT-22686058
[Journal Article] Nanostructural evolution of Ti(O, N, C) precipitates in V-4Cr-4Ti alloys studied by 3 dimensional atom probe2011
- Author(s)
  M. Hatakeyama, T. Muroga, S. Tamura and I. Yamagata
- Journal Title
  
  Journal of Nuclear Materials
  
  Volume: VOL. 412 Pages: 303-305
- DOI
  10.1016/j.jnucmat.2011.02.034
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-23760804
[Journal Article] Irradiation-induced precipitates in a neutron irradiated 304 stainless steel studied by three-dimensional atom probe2011
- Author(s)
  T. Toyama, Y. Nozawa, W. Van Renterghem, Y. Matsukawa, M. Hatakeyama, Y. Nagai, A. Al Mazouzi, S. Van Dyck
- Journal Title
  
  J. Nucl. Mater
  
  Volume: 418 Pages: 62-68
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-21246142
[Journal Article] Irradiation-induced changes of the atomic distributions around the interfaces of carbides in a nuclear reactor pressure vessel steel2010
- Author(s)
  T.Toyama, N.Tsuchiya, Y.Nagai, A.Almazouzi, M.Hatakeyama, M.Hasegawa, T.Ohkubo, E.van Walle, R.Gerard
- Journal Title
  
  J.Nucl.Mater.
  
  Volume: 405 Pages: 177-180
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-21246142
[Journal Article] Irradiation-induced changes of the atomic distributions around the interfaces of carbides in a nuclear reactor pressure vessel steel2010
- Author(s)
  T. Toyama, N. Tsuchiya, Y. Nagai, A. Almazouzi, M. Hatakeyama, M. Hasegawa, T. Ohkubo, E. van Walle, R. Gerard
- Journal Title
  
  J. Nucl. Mater
  
  Volume: 405 Pages: 177-180
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-21246142
[Journal Article] 3D-AP and positron annihilation study of precipitation behavior in Cu-Ct-Zr alloy2009
- Author(s)
  M.Hatakeyama, T.Toyama, J.Yang, Y.Nagai, M.Hasegawa, T.Ohkubo, M.Eldrup, B.N.Singh
- Journal Title
  
  J.Nucl.Mater. 386-388
  
  Pages: 852-855
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17002009
[Journal Article] 3D-AP and positron annihilation study of precipitation behavior in Cu-Cr-Zr alloy2009
- Author(s)
  M. Hatakeyama, T. Toyama, J. Yang , Y. Nagai, M. Hasegawa, T. Ohkubo, M. Eldruo and B.N. Singh
- Journal Title
  
  J. Nucl. Mater. (印刷中)
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17002009
[Journal Article] 3D-AP and positron annihilation study of precipitation behavior in Cu-Ct-Zr alloy2009
- Author(s)
  M.Hatakeyama, T.Toyama, J.Yang, Y.Nagai, M.Hasegawa, T.Ohkubo, M.Eldrup, B.N.Singh
- Journal Title
  
  J.Nucl.Mater. 386-388
  
  Pages: 852-855
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-21246142
[Journal Article] 原子炉圧力容器鋼中ナノ炭化物の三次元アトムプローブ観察2008
- Author(s)
  外山健、土屋直柔、畠山賢彦、永井康介、長谷川雅幸、A.Almazouzi、E.vanWalle、R.Gerard、大久保忠勝
- Journal Title
  
  まてりあ 47
  
  Pages: 610-610
- NAID
  10024404485
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17002009
[Journal Article] 原子炉圧力容器鋼中ナノ炭化物の三次元アトムプローブ観察2008
- Author(s)
  外山健、土屋直柔、畠山賢彦、永井康介、長谷川雅幸、A. Almazouzi. E. van Walle, R. Gerard、大久保忠勝
- Journal Title
  
  まてりあ 47
  
  Pages: 610-610
- NAID
  10024404485
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-20860018
[Journal Article] Ultrasonic cavitation treatment for soldering on Zr-based bulk metallic glass2008
- Author(s)
  Tamura, Y. Tsunekawa, M. Okumiya, M. Hatakeyama,
- Journal Title
  
  Journal of Materials Processing Technology 206
  
  Pages: 322-327
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19760517
[Journal Article] 原子炉圧力容器鋼中微小炭化物の3次元アトムプローブ観察2008
- Author(s)
  外山健, 土屋直柔, 畠山賢彦, 永井康介, 長谷川雅幸, A. Almazouzi, E. van Walle, R. Gerard, 大久保忠勝
- Journal Title
  
  まてりあ 47
  
  Pages: 610-610
- Data Source
  KAKENHI-PROJECT-20860018
[Journal Article] Nanostructural evolution of Cr-rich precipitates in a Cu-Cr-Zr alloy during heat treatment studied by 3 dimensional atom probe2008
- Author(s)
  M. Hatakeyama, T. Toyama, Y. Nagai, M. Hasegawa, T. Ohokubo, M. Eldrup and B.N. Singh
- Journal Title
  
  Mater. Trans. (JIM) 49
  
  Pages: 518-521
- NAID
  10021144925
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17002009
[Journal Article] The diffusion behaviors of interstitial impurities in V-4Cr-4Ti alloys under ion irradiation2007
- Author(s)
  M. Hatakeyama, S. Tamura, T. Muroga, N. Yoshida, M. Hasegawa, H. Matsui
- Journal Title
  
  J. Nucl. Mater. 367-370
  
  Pages: 882-886
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17002009
[Journal Article] Ultrasonic cavitation treatment for soldering on Zr-based bulk metallic glass2007
- Author(s)
  S. Tamura, Y. Tsunekawa, M. Okumiya, M. Hatakeyama
- Journal Title
  
  Journal of Materials Processing Technology (In Press)(In press)(掲載確定)
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-19760517
[Presentation] The effect of σ phase on corrosion behavior of duplex stainless steels2021
- Author(s)
  Koichiro Nagae, Kento Ejiri, Jyunichi Hirabayashi, Yuichi Yamamoto, Masahiko Hatakeyama, Satoshi Sunada
- Organizer
  15th International Conference on the Physical Properties and Application of Advanced Materials
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K04774
[Presentation] Effect of Carbon on Quantitative Evaluation of Hydrogen Atoms Trapped at Vacancy-type Defects Using Positron Annihilation Spectroscopy in Tungsten2021
- Author(s)
  K. Sato, M. Hirabaru, M. Onoue, M. Hatakeyama, Q. Xu, Y. Watanabe, T. Nozawa
- Organizer
  20th International Conference on Fusion Reactor Materials (ICFRM-20)
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-21H01068
[Presentation] Accuracy Improvement of Electrochemical Measurements in Magnesium Alloys2021
- Author(s)
  Kenichi Nakano, Masaki Naganawa, Ami Morihiro, Satoshi Sunada, Masahiko Hatakeyama
- Organizer
  15th International Conference on the Physical Properties and Application of Advanced Materials
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K04774
[Presentation] In-situ Observation of Damage Structure in Cu-Cr-Zr and Cu-Cr Alloy During 1.25 MeV Electron Irradiation2021
- Author(s)
  M.Hatakeyama, T.Yamamoto, K.Yasuda, S.Matsumura, K.Yasunaga, K.Sato
- Organizer
  20th International Conference of Fusion Reactor Materials
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K04774
[Presentation] Corrosion properties of the β-Mg17A12 phase in NaCl solutions2021
- Author(s)
  Kaede Sarayama, Kenichi Nakano, Ami Morihiro, Masahiko Hatakeyama, Satoshi sunada and Koichi Sato
- Organizer
  15th International Conference on the Physical Properties and Application of Advanced Materials
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K04774
[Presentation] The effect of base oil viscosity on the corrosion preventive properties of the rust preventive oils2021
- Author(s)
  Mochisuke Kume, Daisuke Iwashima, Masahiko Hatakeyama, Satoshi Sunada
- Organizer
  15th International Conference on the Physical Properties and Application of Advanced Materials
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K04774
[Presentation] Quantitative estimation of hydrogen atoms trapped at vacancy-type defects in electron-irradiated metals: PAS experiments and simulations2021
- Author(s)
  K. Sato, Y. Kondo, M. Ohta, A. Hirosako, M. Onoue, M. Hatakeyama, S. Sunada, Q. Xu
- Organizer
  11th International Conference on the advanced materials (THERMEC'2021)
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K03584
[Presentation] Mg-Al系合金の腐食特性に及ぼすAg添加の影響2021
- Author(s)
  森廣あみ, 更山楓, 中野健一, 佐藤紘一, 砂田聡, 畠山賢彦
- Organizer
  日本金属学会北陸信越支部・日本鉄鋼協会北陸信越支部令和3年度連合講演会
- Data Source
  KAKENHI-PROJECT-18K04774
[Presentation] Improvement of corrosion resistance of the AZ91 magnesium alloys with sputtered aluminum film using heat treatment, anodic oxidation treatment, and sealing process2021
- Author(s)
  Masahiko Hatakeyama, Kenichi Nakano, Ryosuke Yoshita, Satoshi Sunada, Masateru Nose
- Organizer
  15th International Conference on the Physical Properties and Application of Advanced Materials
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K04774
[Presentation] Evaluation of the Corrosion Resistance of ODS-Cu, Cu-Cr-Zr and Cu-Cr Alloys by Electrochemical Methods2021
- Author(s)
  Masahiko Hatakeyama, Kai Okada, Satoshi Sunada, Koichi Sato
- Organizer
  20th International Conference of Fusion Reactor Materials
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K04774
[Presentation] Mg-Al系合金の腐食挙動に及ぼす第三元素添加の影響2020
- Author(s)
  更山　楓、島田　裕介、川手　直樹、中野　健一、安永　和史、畠山　賢彦、砂田　聡
- Organizer
  令和二年度日本金属学会・日本鉄鋼協会北陸信越支部連合講演会
- Data Source
  KAKENHI-PROJECT-18K04774
[Presentation] β-Mg17Al12化合物単相の作製および腐食特性評価2020
- Author(s)
  島田　裕介、更山　楓、川手　直樹、中野　健一、佐藤　紘一、畠山　賢彦、砂田　聡
- Organizer
  令和二年度日本金属学会・日本鉄鋼協会北陸信越支部連合講演会
- Data Source
  KAKENHI-PROJECT-18K04774
[Presentation] 耐食性向上を目的としたMg-Al合金のAl-rich-α相とβ相の第一原理計算による構造解析2019
- Author(s)
  江藤　大樹、佐藤　紘一、畠山　賢彦、砂田　聡
- Organizer
  日本金属学会2019年春期講演大会
- Data Source
  KAKENHI-PROJECT-18K04774
[Presentation] 電子線照射した F82H 鋼における水素を捕獲した原子空孔の陽電子寿命値の変化2019
- Author(s)
  大田真聖、近藤耀平、駒崎慎一、徐虫L、薮内敦、木野村淳、畠山賢彦、岩切宏友、加藤太治、渡辺淑之、谷川博康、佐藤紘一
- Organizer
  日本金属学会九州支部　学術講演会
- Data Source
  KAKENHI-PROJECT-18K03584
[Presentation] AM系マグネシウム合金の腐食挙動に及ぼすアルミニウム含有量の影響2019
- Author(s)
  中田　晴子、竹内　彰吾、佐藤　紘一、川手　直樹、島田　裕介、畠山　賢彦、砂田　聡
- Organizer
  日本金属学会2019年春期講演大会
- Data Source
  KAKENHI-PROJECT-18K04774
[Presentation] Mg-Al 系合金の腐食特性に及ぼすアルミニウム含有量の影響2019
- Author(s)
  島田　裕介、中田　晴子、佐藤　紘一、川手　直樹、畠山　賢彦、砂田聡
- Organizer
  腐食防食学会第66回材料と環境討論会
- Data Source
  KAKENHI-PROJECT-18K04774
[Presentation] Dependence of positron annihilation lifetime of vacancy-type defects on hydrogen atoms2019
- Author(s)
  K. Sato, Y. Kondo, M. Ota, M. Onoue, M. Hatakeyama, S. Sunada, Q. Xu, Y. Watanabe, D. Hamaguchi, H. Tanigawa
- Organizer
  19th International Conference on Fusion Reactor Materials (ICFRM-19)
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K03584
[Presentation] AM系マグネシウム合金の腐食挙動に及ぼすAl-rich-α相の影響2018
- Author(s)
  中田　晴子、竹内　彰吾、畠山　賢彦、砂田　聡
- Organizer
  日本金属学会北陸信越支部・日本鉄鋼協会北陸信越支部平成30年度総会・連合講演会
- Data Source
  KAKENHI-PROJECT-18K04774
[Presentation] Experimentally Obtained Change in Positron Annihilation Lifetime of Vacancies containing Hydrogen Atoms in Tungsten2018
- Author(s)
  K. Sato, Y. Kondo, M. Ohta, A. Hirosako, M. Onoue, M. Hatakeyama, S. Sunada, Q. Xu
- Organizer
  14th International Workshop on Spallation Materials Technology
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K03584
[Presentation] Change in Positron Annihilation Lifetime of Vacancy Clusters Containing Hydrogen Atoms in F82H2018
- Author(s)
  Y. Kondo, M. Ohta, K. Ohyama, S. Komazaki, Q. Xu, A. Yabuuchi, A. Kinomura, M. Hatakeyama, H. Iwakiri, D. Kato, Y. Watanabe, H. Tanigawa, K. Sato
- Organizer
  14th International Workshop on Spallation Materials Technology
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K03584
[Presentation] H2SO4 -NaCl 水溶液におけるスーパー二相ステンレス鋼 F55 の腐食挙動の観察2017
- Author(s)
  辻康広、平林純一、山本有一、畠山賢彦、砂田聡
- Organizer
  日本金属学会春季講演大会
- Place of Presentation
  首都大学東京南大沢キャンパス
- Year and Date
  2017-03-15
- Data Source
  KAKENHI-PROJECT-26420850
[Presentation] SSRT条件下におけるスーパー二相ステンレス鋼の応力腐食割れに及ぼすσ相の影響2016
- Author(s)
  有山　綾佳、平林　純一、山本　有一、畠山　賢彦、砂田　聡
- Organizer
  日本金属学会
- Place of Presentation
  東京理科大学葛飾キャンパス
- Year and Date
  2016-03-23
- Data Source
  KAKENHI-PROJECT-26420850
[Presentation] マグネシウム合金用切削油の防錆特性評価2016
- Author(s)
  日比野　圭祐、長瀬　直樹、畠山　賢彦、砂田　聡
- Organizer
  日本金属学会
- Place of Presentation
  東京理科大学葛飾キャンパス
- Year and Date
  2016-03-23
- Data Source
  KAKENHI-PROJECT-26420850
[Presentation] Influence of β-Mg17Al12 Phase on Initial Pitting Process of AZ91D Magnesium Alloy2016
- Author(s)
  Masahiro Kaido, Kenta Imai, Masahiko Hatakeyama, Satoshi Sunada
- Organizer
  THERMEC’2016
- Place of Presentation
  オーストリア
- Year and Date
  2016-05-29
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26420850
[Presentation] 粗悪燃料中におけるCu-Ni-Sn-C-P系合金焼結材料に及ぼすNi含有量の影響2015
- Author(s)
  坂上　陸、竹添　真一、石井　義成、畠山　賢彦、砂田
- Organizer
  粉体粉末冶金協会
- Place of Presentation
  早稲田大学
- Year and Date
  2015-05-26
- Data Source
  KAKENHI-PROJECT-26420850
[Presentation] Corrosion Resistant Evaluation of Oxygen Solid-Solution Strengthened Pure Titanium2015
- Author(s)
  Satoshi Sunada, Akihiro Takagi, Masahiko Hatakeyama, Junko Umeda, Katsuyoshi Kondoh
- Organizer
  10th International Conference on the Physical Properties and Application of Advanced Materials
- Place of Presentation
  タイ
- Year and Date
  2015-11-17
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26420850
[Presentation] 種々の防錆油を塗布したFe-Cu-C焼結鋼の分極曲線(第三報)2015
- Author(s)
  岩嶋　大輔、長瀬　直樹、畠山　賢彦、砂田　聡
- Organizer
  腐食防食学会
- Place of Presentation
  東京電機大学
- Year and Date
  2015-05-18
- Data Source
  KAKENHI-PROJECT-26420850
[Presentation] β相を含むマグネシウム合金の孔食発生に及ぼす金属組織の影響2015
- Author(s)
  海藤　雅裕、畠山　賢彦、砂田　聡
- Organizer
  日本金属学会
- Place of Presentation
  九州大学伊都キャンパス
- Year and Date
  2015-09-16
- Data Source
  KAKENHI-PROJECT-26420850
[Presentation] MIMにより製造されたFe-Cr系軟磁性材料の腐食特性2015
- Author(s)
  浜髙　祐樹、畠山　賢彦、長田　稔子、三浦　秀士、岩津　修、田中　茂雄、砂田　聡
- Organizer
  粉体粉末冶金協会
- Place of Presentation
  京都大学
- Year and Date
  2015-11-11
- Data Source
  KAKENHI-PROJECT-26420850
[Presentation] MIMにより製造されたFe-Cr系軟磁性材料の力学特性および電気化学特性2015
- Author(s)
  浜髙　祐樹、畠山　賢彦、長田　稔子、三浦　秀士、岩津　修、田中　茂雄、砂田　聡
- Organizer
  粉体粉末冶金協会
- Place of Presentation
  早稲田大学
- Year and Date
  2015-05-26
- Data Source
  KAKENHI-PROJECT-26420850
[Presentation] AZ91Dマグネシウム合金の孔食底部に及ぼすミクロ組織の影響2015
- Author(s)
  海藤　雅裕、今井　健太、畠山　賢彦、砂田　聡
- Organizer
  腐食防食学会
- Place of Presentation
  東京電機大学
- Year and Date
  2015-05-18
- Data Source
  KAKENHI-PROJECT-26420850
[Presentation] 定電位下におけるマグネシウム合金の孔食発生過程に及ぼす金属組織の影響2015
- Author(s)
  海藤　雅裕、長縄　昌樹、畠山賢彦、砂田　聡
- Organizer
  腐食防食学会
- Place of Presentation
  福岡工業大学
- Year and Date
  2015-11-04
- Data Source
  KAKENHI-PROJECT-26420850
[Presentation] Mechanical and electrochemical properties of the Fe-Cr-Based soft magnetic alloys fabricated by metal injection molding2015
- Author(s)
  Yuki Hamataka, Toshiko Osada, Hideshi Miura, Osamu Iwatsu, Sigeo Tanaka, Masahiko Hatakeyama, Satoshi Sunada
- Organizer
  10th International Conference on the Physical Properties and Application of Advanced Materials
- Place of Presentation
  タイ
- Year and Date
  2015-11-17
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26420850
[Presentation] Effect of Heat-treatment on the Corrosion Resistance of AZ91 Coated with Aluminum Sputtering Film2015
- Author(s)
  Ryosuke Yoshita, Yosuke Ishibashi, Masahiko Hatakeyama, Masateru Nose, Satoshi Sunada
- Organizer
  10th International Conference on the Physical Properties and Application of Advanced Materials
- Place of Presentation
  タイ
- Year and Date
  2015-11-17
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-26420850
[Presentation] Dislocation loop nucleation and growth in Cu–Cr–Zr alloy during 1.25 MeV electron irradiation2013
- Author(s)
  M. Hatakeyama
- Organizer
  16th International Conference on Fusion Reactor Materials
- Place of Presentation
  北京,中国
- Data Source
  KAKENHI-PROJECT-23760804
[Presentation] Cu-Cr-ZrおよびCu-Cr合金における電子線照射その場観察2013
- Author(s)
  畠山賢彦
- Organizer
  日本金属学会秋季講演会
- Place of Presentation
  金沢大学
- Year and Date
  2013-09-13
- Data Source
  KAKENHI-PROJECT-23760804
[Presentation] オーステナイトステンレス鋼における転位―溶質原子相互作用の直接観察2013
- Author(s)
  畠山賢彦、山県一郎、松川義孝、田村賢
- Organizer
  KUR研究会
- Place of Presentation
  京都大学原子炉実験所
- Year and Date
  2013-12-13
- Data Source
  KAKENHI-PROJECT-23760804
[Presentation] Dislocation loop nucleation and growth in Cu-Cr-Zr alloy during 1.25 MeV electron irradiation2013
- Author(s)
  M. Hatakeyama
- Organizer
  16th International Conference on Fusion Reactor Materials
- Place of Presentation
  北京、中国
- Data Source
  KAKENHI-PROJECT-23760804
[Presentation] Irradiation-induced complex precipitates in a modified 316 stainless steel studied with three-dimensional atom probe2012
- Author(s)
  M. Hatakeyama, I. Yamagata
- Organizer
  Nuclear Materials conference
- Place of Presentation
  大阪国際会議場
- Data Source
  KAKENHI-PROJECT-23760804
[Presentation] Irradiation-induced complex precipitates in a modified 316 stainless steel studied with three-dimensional atom probe2012
- Author(s)
  M. Hatakeyama and I. Yamagata
- Organizer
  The Nuclear Materials Conference
- Place of Presentation
  大阪国際交流センター
- Data Source
  KAKENHI-PROJECT-23760804
[Presentation] 中性子照射された改良型316ステンレス鋼における転位の3次元アトムプローブ解析2012
- Author(s)
  畠山賢彦、山県一郎
- Organizer
  日本金属学会秋季講演会
- Place of Presentation
  愛媛大学
- Data Source
  KAKENHI-PROJECT-23760804
[Presentation] 中性子照射された改良型316ステンレス鋼における転位の3次元アトムプローブ解析2012
- Author(s)
  畠山賢彦、山県一郎
- Organizer
  日本金属学会
- Place of Presentation
  愛媛大学
- Data Source
  KAKENHI-PROJECT-23760804
[Presentation] Microstructural analysis just below intergranularfractured surfaces in RPV steels and their model alloys using atom probe tomography2011
- Author(s)
  T.Toyama, Y.Nozawa, Y.Matsukawa, M.Hatakeyama, Y.Nishiyama, M.Hasegawa, Y.Nagai
- Organizer
  IGRDM-16
- Place of Presentation
  Santa Barbara, USA
- Year and Date
  2011-12-05
- Data Source
  KAKENHI-PROJECT-21246142
[Presentation] Irradiation-induced precipitates and grain boundary segregation in 304 stainless steel neutron-irradiated to 24 dpa studied by atom probe tomography2011
- Author(s)
  T.Toyama, Y.Nozawa, Y.Matsukawa, M.Hatakeyama, Y.Nagai, W.Van Renterghem, S.Van Dyck, A.Al Mmazouzi
- Organizer
  IGRDM-16
- Place of Presentation
  Santa Barbara, USA
- Year and Date
  2011-12-09
- Data Source
  KAKENHI-PROJECT-21246142
[Presentation] Irradiation-induced precipitation in a SUS316 stainless steel using three-dimensional atom probe2011
- Author(s)
  M. Hatakeyama, I. Yamagata
- Organizer
  15th International Conference on Fusion Reactor Materials
- Place of Presentation
  チャールストン,米国
- Data Source
  KAKENHI-PROJECT-23760804
[Presentation] 原子力機構西山裕孝3次元アトムプローブによるA533B鋼の粒界破面直下からの粒界偏析観察2011
- Author(s)
  外山健、野沢康子、松川義孝、畠山賢彦、永井康介
- Organizer
  日本金属学会2011年秋期大会
- Place of Presentation
  沖縄コンベンションセンター
- Year and Date
  2011-11-08
- Data Source
  KAKENHI-PROJECT-21246142
[Presentation] Irradiation-Induced Precipitation in a SUS316 Stainless Steel　Studied with Three-Dimensional Atom Probe2011
- Author(s)
  M. Hatakeyama and I. Yamagata
- Organizer
  15th International Conference on Fusion Reactor Materials
- Place of Presentation
  Charleston Marriott、米国
- Data Source
  KAKENHI-PROJECT-23760804
[Presentation] Microstructural analysis just below intergranular fractured surfaces in RPV steels and their model alloys using atom probe tomography2011
- Author(s)
  T. Toyama, Y. Nozawa, Y. Matsukawa, M. Hatakeyama, Y. Nishiyama, M. Hasegawa, Y. Nagai
- Organizer
  IGRDM-16
- Place of Presentation
  Santa Barbara, USA
- Year and Date
  2011-12-05
- Data Source
  KAKENHI-PROJECT-21246142
[Presentation] リン添加オーステナイトステンレス鋼における照射誘起析出物の3次元アトムプローブ解析2011
- Author(s)
  畠山賢彦、山県一郎
- Organizer
  日本金属学会秋季講演会
- Place of Presentation
  沖縄コンベンションセンター
- Data Source
  KAKENHI-PROJECT-23760804
[Presentation] A533B鋼粒界破面直下からの3次元アトムプローブ観察2011
- Author(s)
  外山健、野沢康子、松川義孝、畠山賢彦、永井康介、西山裕孝
- Organizer
  金研ワークショップ「鉄鋼材料照射影響機構研究の最近の進展～ナノ組織から機械的特性へいかにつなげるか? 」
- Place of Presentation
  東北大学金属材料研究所
- Data Source
  KAKENHI-PROJECT-21246142
[Presentation] A533B鋼粒界破面直下からの3次元アトムプローブ観察2011
- Author(s)
  外山健、野沢康子、松川義孝、畠山賢彦、永井康介、西山裕孝
- Organizer
  金研ワークショップ「鉄鋼材料照射影響機構研究の最近の進展～ナノ組織から機械的特性へいかにつなげるか?」
- Place of Presentation
  東北大学
- Data Source
  KAKENHI-PROJECT-21246142
[Presentation] リン添加オーステナイトステンレス鋼における照射誘起析出物の3次元アトムプローブ解析2011
- Author(s)
  畠山賢彦、山県一郎
- Organizer
  日本金属学会
- Place of Presentation
  沖縄コンベンションセンター
- Data Source
  KAKENHI-PROJECT-23760804
[Presentation] Irradation-induced precipitates in V–4Cr–4Ti alloys studied using three-dimensional atom probe2011
- Author(s)
  M. Hatakeyama, T. Nagasaka, T. Muroga, T. Toyama and I. Yamagata
- Organizer
  15th International Conference on Fusion Reactor Materials
- Place of Presentation
  チャールストン,米国
- Data Source
  KAKENHI-PROJECT-23760804
[Presentation] Irradiation-Induced Precipitation of Ti(O, N, C) in V-4Cr-4Ti　Alloys Studied with Three-Dimensional Atom Probe2011
- Author(s)
  M. Hatakeyama, T. Nagasaka, T. Muroga, T. Toyama and I. Yamagata
- Organizer
  15th International Conference on Fusion Reactor Materials
- Place of Presentation
  Charleston Marriott、米国
- Data Source
  KAKENHI-PROJECT-23760804
[Presentation] Temperature dependency of positron trapping at Irradiation-induced defects in Fe-Cu(-Mn)model alloys2010
- Author(s)
  T.Toyama, M.Hatakeyama, K.Inoue, Y.Nagai, M.Hasegawa
- Organizer
  IGRDM-15
- Place of Presentation
  Budapest, Hungary
- Data Source
  KAKENHI-PROJECT-17002009
[Presentation] 3次元アトムプローブで調べた中性子照射304ステンレス鋼中のNi-Si析出物の照射後焼鈍回復2010
- Author(s)
  外山健、野沢康子、松川義孝、畠山賢彦、W.van Renterghem、S.van Dyck、A.Almazouzi
- Organizer
  日本金属学会2010年秋期大会(第147回)
- Place of Presentation
  北海道大学
- Year and Date
  2010-09-26
- Data Source
  KAKENHI-PROJECT-21246142
[Presentation] 3次元アトムプローブで調べた中性子照射304ステンレス鋼中のNi-Si析出物の照射後焼鈍回復2010
- Author(s)
  外山健、野沢康子、松川義孝、畠山賢彦、W. van Renterghem、S. van Dyck、A. Almazouzi
- Organizer
  日本金属学会2010年秋期大会
- Place of Presentation
  北海道大学
- Year and Date
  2010-09-26
- Data Source
  KAKENHI-PROJECT-21246142
[Presentation] 第2世代の原子炉圧力容器鋼監視試験片(ベルギーDoel-4炉)の照射後焼鈍2009
- Author(s)
  外山健、土屋直柔、畠山賢彦、永井康介、長谷川雅幸、A.Almazouzi、E.van Walle、R.Gerard
- Organizer
  日本金属学会2009年度秋期講演大会
- Place of Presentation
  京都大学
- Data Source
  KAKENHI-PROJECT-21246142
[Presentation] Temperature dependency of positron trapping at Irradiation-induced defects in Fe-Cu(-Mn)model alloys2009
- Author(s)
  T.Toyama, M.Hatakeyama, K.Inoue, Y.Nagai, M.Hasegawa
- Organizer
  IGRDM-15
- Place of Presentation
  Budapest, Hungary
- Data Source
  KAKENHI-PROJECT-21246142
[Presentation] 原子炉圧力容器鋼の中性子照射によるナノ組織変化と照射硬化2009
- Author(s)
  外山健、畠山賢彦、永井康介、長谷川雅幸、A.Almazouzi、E.van Walle、R.Gerard
- Organizer
  日本物理学会2009年秋季大会
- Place of Presentation
  熊本大学
- Data Source
  KAKENHI-PROJECT-21246142
[Presentation] 第2世代の原子炉圧力容器鋼監視試験片(ベルギーDoel-4炉)の照射後焼鈍2009
- Author(s)
  外山健、土屋直柔、畠山賢彦、永井康介、長谷川雅幸、A.Almazouzi、E.van Walle、R.Gerard
- Organizer
  日本金属学会2009年度秋期講演大会
- Place of Presentation
  京都大学
- Year and Date
  2009-09-16
- Data Source
  KAKENHI-PROJECT-20860018
[Presentation] 原子炉圧力容器鋼の中性子照射によるナノ組織変化と照射硬化2009
- Author(s)
  外山健、畠山賢彦、永井康介、長谷川雅幸、A.Almazouzi、E.van Walle, R.Gerard
- Organizer
  日本物理学会2009年秋季大会
- Place of Presentation
  熊本市
- Data Source
  KAKENHI-PROJECT-17002009
[Presentation] 第2世代の原子炉圧力容器鋼監視試験片 (ベルギーDoel-4炉) の照射後焼鈍2009
- Author(s)
  外山健, 土屋直柔, 畠山賢彦, 永井康介, 長谷川雅幸, A. Almazouzi, E. van Walle, R. Gerard
- Organizer
  日本金属学会
- Place of Presentation
  京都大学
- Data Source
  KAKENHI-PROJECT-20860018
[Presentation] 低Cu原子炉圧力容器鋼監視試験片のナノ組織と照射硬化2009
- Author(s)
  外山健、土屋直柔、畠山賢彦、永井康介、長谷川雅幸、A. Almazouzi, E. van Walle, R. Gerard
- Organizer
  日本金属学会
- Place of Presentation
  東京工業大学
- Year and Date
  2009-03-30
- Data Source
  KAKENHI-PROJECT-20860018
[Presentation] 原子炉圧力容器鋼の中性子照射によるナノ組織変化と照射硬化2009
- Author(s)
  外山健, 土屋直柔, 畠山賢彦, 永井康介, 長谷川雅幸, A. Almazouzi, E. van Walle, R. Gerard
- Organizer
  日本物理学会
- Place of Presentation
  熊本大学
- Data Source
  KAKENHI-PROJECT-20860018
[Presentation] 第2世代の原子炉圧力容器鋼監視試験片(ベルギーDoel-4炉)の照射後焼鈍2009
- Author(s)
  外山健、土屋直柔、畠山賢彦、永井康介、長谷川雅幸、A.Almazouzi、E.van Walle、R.Gerard
- Organizer
  日本金属学会2009年度秋期講演大会
- Place of Presentation
  京都市
- Data Source
  KAKENHI-PROJECT-17002009
[Presentation] 原子炉圧力容器鋼の中性子照射によるナノ組織変化と照射硬化2009
- Author(s)
  外山健、畠山賢彦、永井康介、長谷川雅幸、A.Almazouzi、E.van Walle、R.Gerard
- Organizer
  日本物理学会2009年秋季大会
- Place of Presentation
  熊本大学
- Year and Date
  2009-09-26
- Data Source
  KAKENHI-PROJECT-20860018
[Presentation] 中性子照射したFe-Cu、Fe-Cu-Mnモデル合金中陽電子消滅の温度依存性2009
- Author(s)
  外山健、畠山賢彦、井上耕治、永井康介、長谷川雅幸
- Organizer
  第46回アイソトープ・放射線研究発表会
- Place of Presentation
  東京都
- Data Source
  KAKENHI-PROJECT-17002009
[Presentation] 中性子照射したFe-Cu、Fe-Cu-Mnモデル合金中陽電子消滅の温度依存性2009
- Author(s)
  外山健、畠山賢彦、井上耕治、永井康介、長谷川雅幸
- Organizer
  第46回アイソトープ・放射線研究発表会
- Place of Presentation
  東京・日本科学未来館
- Data Source
  KAKENHI-PROJECT-21246142
[Presentation] 低Cu原子炉圧力容器鋼監視試験片 (ベルギーDoel-4炉) のナノ組織と照射硬化2009
- Author(s)
  外山健, 土屋直柔, 畠山賢彦, 永井康介, 長谷川雅幸
- Organizer
  日本金属学会(A. Almazouzi, E. van Walle, R. Gerard)
- Place of Presentation
  東京工業大学
- Data Source
  KAKENHI-PROJECT-20860018
[Presentation] Temperature Dependence of Strengthening by Nano Cu Precipitates in a Thermally Aged Fe-Cu Alloy2006
- Author(s)
  M. Hasegawa, Y. Ito, M. Hatakeyama, Y. Nagai, Z. Tang, Y. N. Osetskiy
- Organizer
  Plasticity 2006
- Place of Presentation
  Halifax, Canada
- Year and Date
  2006-07-19
- Data Source
  KAKENHI-PROJECT-17002009
[Presentation] AZ91Dマグネシウム合金の腐食形態に及ぼすβ相の影響
- Author(s)
  海藤雅裕、今井　健太、畠山　賢彦、砂田　聡
- Organizer
  日本金属学会
- Place of Presentation
  東京大学駒場キャンパス
- Year and Date
  2015-03-18 – 2015-03-20
- Data Source
  KAKENHI-PROJECT-26420850
[Presentation] Na2SO4およびNaCl水溶液に浸漬したMg-3%Al-1%Si合金の腐食特性に及ぼすアニオン種の影響
- Author(s)
  姉川雅樹、才川　清二、池野　進、畠山　賢彦、砂田　聡
- Organizer
  軽金属学会
- Place of Presentation
  東京工業大学
- Year and Date
  2014-11-15 – 2014-11-16
- Data Source
  KAKENHI-PROJECT-26420850
[Presentation] The Effect of σ Phase on Corrosion Behavior of Duplex Stainless Steel F55
- Author(s)
  Kento Ejiri, Jyunichi Hirabayashi, Satoshi Matuoka, Yuichi Yamamoto, Masahiko Hatakeyama, Satoshi Sunada
- Organizer
  19th International Forgemaster Meeting
- Place of Presentation
  東京
- Year and Date
  2014-09-29 – 2014-10-03
- Data Source
  KAKENHI-PROJECT-26420850
[Presentation] SPSによって作製されたマグネシウム焼結材の力学特性および腐食特性に及ぼすSnの影響
- Author(s)
  石橋　陽亮、村田　穂高、松井　良剛、岩岡　拓、畠山　賢彦、砂田　聡
- Organizer
  粉末冶金協会
- Place of Presentation
  大阪コンベンションセンター
- Year and Date
  2014-10-29 – 2014-10-31
- Data Source
  KAKENHI-PROJECT-26420850
[Presentation] The Effect of σ Phase on Corrosion Behavior of Duplex Stainless Steel F55
- Author(s)
  Kento Ejiri, Jyunichi Hirabayashi, Satoshi Matuoka, Yuichi Yamamoto, Masahiko Hatakeyama, Satoshi Sunada
- Organizer
  9th International Conference on the Physical Properties and Application of Advanced Materials
- Place of Presentation
  ポーランド
- Year and Date
  2014-09-14 – 2014-09-18
- Data Source
  KAKENHI-PROJECT-26420850
[Presentation] Effects of Aluminum Sputtering on the Corrosion Resistance of AZ91 Alloy
- Author(s)
  Yosuke Ishibashi, Masateru Nose, Masahiko Hatakeyama, Satoshi Sunada
- Organizer
  9th International Conference on the Physical Properties and Application of Advanced Materials
- Place of Presentation
  ポーランド
- Year and Date
  2014-09-14 – 2014-09-18
- Data Source
  KAKENHI-PROJECT-26420850
[Presentation] Study of Rust Preventive Characteristics of Rust Preventive Oil from Polarization
- Author(s)
  Daisuke Iwashima, Sayaka Hirata, Naoki Nagase, Masahiko Hatakeyama, Satoshi Sunada
- Organizer
  9th International Conference on the Physical Properties and Application of Advanced Materials
- Place of Presentation
  ポーランド
- Year and Date
  2014-09-14 – 2014-09-18
- Data Source
  KAKENHI-PROJECT-26420850
[Presentation] 金属材料に塗布する防錆油の分極曲線測定による防錆特性評価(第二報)
- Author(s)
  岩嶋大輔、平田さやか、長瀬　直樹、畠山　賢彦、砂田　聡
- Organizer
  日本金属学会
- Place of Presentation
  名古屋大学
- Year and Date
  2014-09-24 – 2014-09-26
- Data Source
  KAKENHI-PROJECT-26420850
[Presentation] スーパー二相ステンレス鋼F55材の溶接部の腐食特性
- Author(s)
  江尻健人、平林純一、松岡聡、山本　有一、畠山　賢彦、砂田　聡
- Organizer
  日本金属学会
- Place of Presentation
  名古屋大学
- Year and Date
  2014-09-24 – 2014-09-26
- Data Source
  KAKENHI-PROJECT-26420850

1. NAGAI Yasuyoshi (10302209)

# of Collaborated Projects: 6 results

# of Collaborated Products: 35 results
2. INOUE Koji (50344718)

# of Collaborated Projects: 4 results

# of Collaborated Products: 2 results
3. Sato Koichi (30378971)

# of Collaborated Projects: 4 results

# of Collaborated Products: 28 results
4. HASEGAWA Masayuki (80005975)

# of Collaborated Projects: 3 results

# of Collaborated Products: 10 results
5. TANG Zheng (80271972)

# of Collaborated Projects: 3 results

# of Collaborated Products: 1 results
6. 湯葢邦夫 (00302208)

# of Collaborated Projects: 3 results

# of Collaborated Products: 0 results
7. TOYAMA Takeshi (50510129)

# of Collaborated Projects: 3 results

# of Collaborated Products: 36 results
8. 徐ぎゅう (90273531)

# of Collaborated Projects: 3 results

# of Collaborated Products: 0 results
9. MATSUKAWA Yoshitaka (70566356)

# of Collaborated Projects: 2 results

# of Collaborated Products: 14 results
10. KURISHITA Hiroaki (50112298)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
11. 砂田聡 (00206575)

# of Collaborated Projects: 2 results

# of Collaborated Products: 23 results
12. NAKAI Kiyomichi (60038114)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
13. KOBAYASHI Sengo (10304651)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
14. SAKAMOTO Tatsuaki (80403848)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
15. TAMURA Satoshi (20367832)

# of Collaborated Projects: 1 results

# of Collaborated Products: 2 results
16. TSUNEKAWA Yoshiki (50148350)

# of Collaborated Projects: 1 results

# of Collaborated Products: 2 results
17. OKUMIYA Masahiro (20177182)

# of Collaborated Projects: 1 results

# of Collaborated Products: 2 results
18. SHIMIZU Yasuo (40581963)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
19. NISHIYAMA Yutaka (60414596)

# of Collaborated Projects: 1 results

# of Collaborated Products: 4 results
20. YAMAGUCHI Masatake (50360417)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
21. HIRAOKA Yutaka (70228774)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
22. HONO Kazuhiro (60229151)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
23. 笠田竜太 (20335227)

# of Collaborated Projects: 1 results

# of Collaborated Products: 1 results
24. 安永和史 (20404064)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
25. 野瀬正照 (70269570)

# of Collaborated Projects: 1 results

# of Collaborated Products: 1 results
26. 松田健二 (00209553)

# of Collaborated Projects: 1 results

# of Collaborated Products: 1 results
27. 青井芳史 (70298735)

# of Collaborated Projects: 1 results

# of Collaborated Products: 1 results
28. TAKIDA Tomohiro

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
29. 大窪秀明

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
30. 徐ぎょう

# of Collaborated Projects: 0 results

# of Collaborated Products: 10 results
31. 薮内敦

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results

hatakeyama masahiko 畠山 賢彦

HATAKEYAMA Masahiko 畠山 賢彦

Research Projects

Research Products

Co-Researchers

β相およびAl-rich-α相の形態制御による高耐食性Mg-Al-X合金の開発Principal Investigator

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

Search for novel highly corrosion-resistant Mg-Al-X alloy by suppressing Al-rich alpha phasePrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

TEM and 3DAP characterization of solute-dislocation interactionsPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Investigation of mechanism for enhancement on recombination of point deffects at controlled precipitate/matrix interfacePrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Research Field

Research Institution

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

原子炉ステンレス鋼の応力腐食割れにおける照射欠陥・超微小析出物偏析の効果Principal Investigator

hatakeyama masahiko 畠山賢彦

HATAKEYAMA Masahiko 畠山賢彦