NAKAO Wataru

Affiliation

Faculty of Engineering, Division of Systems Research

Job Title

Professor

Date of Birth

1974

Research Fields, Keywords

Mechanics of fracture, Intelligent material, Ceramic matrix ceramics, structual ceramics, Self-crack-healing

Mail Address

E-mail address

Web Site

http://www.nakaolab712.blogspot.com

Related SDGs




写真a

Education 【 display / non-display

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    2003

    Tokyo Institute of Technology   Department of Chemistry and Materials Science   Doctor Course   Completed

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    2000

    Tokyo Institute of Technology   Department of Chemistry and Materials Science   Master Course   Completed

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    1998

    Tokyo Institute of Technology   Department of metallgy   Graduated

Degree 【 display / non-display

  • Doctor of Engineering - Tokyo Institute of Technology

Campus Career 【 display / non-display

  • 2017.4
     
     

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Systems Research   Professor  

  • 2017.1
    -
    2017.3

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Materials Science and Chemical Engineering   Professor  

  • 2011.4
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    2016.12

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Materials Science and Chemical Engineering   Associate Professor  

  • 2007.12
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    2011.3

    Duty   Yokohama National UniversityInterdisciplinary Research Center   Specially Appointed Assistant Professor  

  • 2007.4
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    2007.11

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Materials Science and Chemical Engineering   Research Fellow  

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Academic Society Affiliations 【 display / non-display

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    The Japan Institute of Metals

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    The Society of Materials Science, Japan

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    American Ceramics Society

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    日本機械学会

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    日本ばね学会

Research Areas 【 display / non-display

  • Nanotechnology/Materials / Structural materials and functional materials

  • Nanotechnology/Materials / Inorganic materials and properties

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Mechanics of materials and materials

 

Research Career 【 display / non-display

  • 自己治癒機能を有する革新的セラミックスタービン材料の開発

    Project Year:

  • スペースデブリ捕獲・回収システムを実現するカプセル型マイクロアクチュエータ

    The Other Research Programs  

    Project Year:

  • ばね鋼の浸炭,脱炭および窒化に関する調査

    The Other Research Programs  

    Project Year:

  • セラミックス基自己治癒材料における新規治癒物質の探索

    The Other Research Programs  

    Project Year:

  • 構造・機械部材の構造健全性を向上する表面改質技術の開発

    JST Target Oriented Research for Embryonic Science and Technology (TOREST)  

    Project Year:

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Books 【 display / non-display

  • スマートマテリアル総覧~自己修復材料編

    中尾 航( Role: Sole author ,  第1章 概論)

    日経BP社  ( ISBN:978-4-296-10026-2

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    Total pages:324   Responsible for pages:15-25   Language:Japanese Book type:Scholarly book

  • Advances in ceramics matrix composite

    T. Osada, W. Nakao, K. Takahashi, K. Ando( Role: Joint author ,  Chapter 17 Self Crack-Healing Behavior in Ceramic-Matrix Composites)

    Woodhead Publisher  ( ISBN:9780857091208

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    Language:English Book type:Scholarly book

  • ENCYCLOPEDIA OF COMPOSITES

    Wataru Nakao( Role: Sole author ,  one chapter; SiC whisker compsite)

    Wiley-VCH 

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    Language:English Book type:Scholarly book

  • Advanced Ceramics-Charactorization, Raw Materials, Processing, Properties Degradation and healing

    K. Takahashi, K. Ando, W. Nakao( Role: Joint author ,  Chapter 18 Crack-Healing Ability of Structural Ceramics and Methodology to Guarantee the Reliability of Ceramic Components)

    INTECH  ( ISBN:9789533075044

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    Language:English Book type:Scholarly book

  • Properties and Applications of Silicon Carbide

    Wataru Nakao( Role: Joint author ,  Chapter 11 Effect of Self-healing on Fatigue Behaviour of Structural Ceramics and Influence Factors on Fatigue Strength of Healed Ceramics)

    INTECH  ( ISBN:9789533072012

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    Language:English Book type:Scholarly book

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Thesis for a degree 【 display / non-display

  • Al-O-N系の熱力学的相安定性とγ-ALON緩衝層を用いた単結晶AlNの作製

    中尾 航

    2003.3

    Doctoral Thesis   Single Work  

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    東京工業大学大学院理工学研究科物質科学専攻
    Al-O-N-C系の高温化学平衡を実験的に測定する手法を確立し,γ-酸窒化アルミニウムの熱力学相安定性を実験的に決定した.これらの相安定図を基に,グラファイト飽和の窒素/一酸化炭素混合ガスによりサファイア基板を窒化し,酸窒化アルミニウムを緩衝層として持つ転位密度の小さい高品位単結晶窒化アルミニウム膜を得る新製造方法を開発した.

  • 熱炭素還元窒化法によるalon合成反応の標準Gibbsエネルギー変化

    中尾 航

    2000.3

    Master Thesis   Single Work  

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    東京工業大学大学院理工学研究科物質科学専攻
    Al-O-N-C系の高温化学平衡を実験的に測定する手法を確立し,γ-酸窒化アルミニウムの熱力学安定性を実験的に決定したγ酸窒化アルミニウムもしくは窒化アルミニウムとアルミナおよびグラファイトが共存する窒素/一酸化炭素の平衡ガス組成を測定した.得られた結果から,アルミナの炭素還元窒化反応の標準Gibbsエネルギー変化を決定した.また,酸窒化アルミニウムの共析分解温度を1903 Kと決定し,2000 KにおけるAl-O-N-C系の化学ポテンシャル図を作成した

Papers 【 display / non-display

  • Stress-Driven Magnetic Barkhausen Noise Generation in FeCo Magnetostrictive Alloy

    Yamazaki Takahiro, Furuya Yasubumi, Hata Seiichi, Nakao Wataru

    IEEE TRANSACTIONS ON MAGNETICS   58 ( 1 )   2022.1

    DOI Web of Science

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Joint Work  

  • Focus on self-healing materials: recent challenges and innovations

    Nakao Wataru, Osada Toshio, Nishiwaki Tomoya, Otsuka Hideyuki

    SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS   22 ( 1 )   234 - 234   2021.12  [Reviewed]

    DOI Web of Science

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Joint Work  

  • Kinetic Analysis on decarburizing of Spring Steel

    NAKAO Wataru, MIYATA Masaharu, SHIBUYA Nobuhiro, KAI Morimichi, ISHIBASHI Fumiya, NEISHI Yutaka, SU … Show more authors

    Transactions of Japan Society of Spring Engineers   2021 ( 66 )   97 - 106   2021.3  [Reviewed]

    DOI

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Spring Engineers   Joint Work  

    <p>The guideline as kinetic equation of decarburizing to prevent excess decrease in fatigue strength, which is expressed as temperature the quenching starts, has been proposed from the systematic investigation on decarburizing spring steels;</p><p><i>T</i><sub>Q</sub> = 910 + 44.7<sup>%</sup>Si - 30<sup>%</sup>Mn - 11<sup>%</sup>Cr - 15.2<sup>%</sup>Ni + 31.5<sup>%</sup>Mo - 203√<sup>%</sup>C - (<sup>%</sup>C - <i>C<sub>S</sub></i>) {1 - exp (-(3.29 × 10<sup>8</sup><i>t</i>) / 2<i>d</i> exp (-(3.61 × 10<sup>4</sup>) / (<i>T</i><sub>h</sub>' + 273)))}</p><p>where <sup>%</sup>M[mass%] indicates content of element M in steel, <i>d</i>[m] initial particle size of austenite. Referring the guideline, quenching from above the evaluated temperature, <i>T</i><sub>Q</sub> can prevent excess decrease in fatigue strength the spring steel exposed to high temperature decarburizing atmosphere, whose temperature is <i>T</i><sub>h</sub>'[°C] and decarburizing time is <i>t</i>[s], because the quenching leads to form the quench microstructure without surface ferrite layer. In the case that the exposed atmosphere is excess CO<sub>2</sub> content, as same as the atmosphere of gas combustion furnace, the value of surface carbon content, <i>C</i><sub>S</sub>[mass%] can be employed to be 0.2. Moreover, if the cooling rate is grater than 80 °C/s corresponding to the cooling rate of oil quenching, the guideline can be used to every spring steels. Similarly if temperature rise is slow, the guideline can be acceptable with modification of the term of decarburizing time to <i>t</i> + 0.03<i>t</i><sub>r</sub>, where <i>t</i><sub>r</sub>[s] is the time period of temperature rise.</p>

    Other Link: https://ci.nii.ac.jp/naid/130008095293

  • Microstructure-Enhanced Inverse Magnetostrictive Effect in Fe-Co Alloy Wires

    Yamazaki Takahiro, Katabira Kenichi, Narita Fumio, Furuya Yasubumi, Nakao Wataru

    ADVANCED ENGINEERING MATERIALS   22 ( 10 )   2000026-1 - 2000026-9   2020.6  [Reviewed]

    DOI Web of Science

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Wiley   Joint Work  

  • Mechanism of stopping crack propagation in continuous fiber reinforced self-healing ceramic

    Lee Jang-Won, Nam Ki-woo, Nakao Wataru

    JOURNAL OF CERAMIC PROCESSING RESEARCH   21 ( 2 )   200 - 207   2020.4  [Reviewed]

    DOI Web of Science

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    Language:English   Publishing type:Research paper (scientific journal)   Joint Work  

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Review Papers 【 display / non-display

  • 自己治癒材料の基礎-機械・構造用途で損傷しても自ら強度を回復する材料

    中尾航

    型技術   35 ( 11 )   72 - 75   2020.11

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:日刊工業新聞   Single Work  

  • 自己治癒能力をもつセラミックスの開発

    中尾航

    トライボロジスト   63   812 - 817   2018.12

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Single Work  

    中尾航, “自己治癒能力をもつセラミックスの開発”, トライボロジスト,63 (2018) 812-817、http://www.tribology.jp/publication/journal/journal63.html

  • 巻頭言:自己治癒・自己修復材料の今後の展望と課題

    中尾 航

    日本機械学会機械材料・材料加工部門ニュースレター   56   1 - 2   2018.11

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    Language:Japanese   Publishing type:Other   Publisher:日本機械学会   Single Work  

  • 高速でき裂を治癒するファインセラミックスー治癒活性相3Dネットワークの設計ー

    長田俊郎, 三留正則, 原徹, 阿部太一, 中尾航, 大村孝仁

    FC Report   37   16 - 21   2018

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Joint Work  

    長田俊郎, 三留正則, 原徹, 阿部太一, 中尾航, 大村孝仁, “高速でき裂を治癒するファインセラミックスー治癒活性相3Dネットワークの設計ー”, FC Report, 37(2019)16-21.

  • セラミックスの破壊統計に関する有限要素解析

    尾崎伸吾、長田俊郎、中尾航

    FCレポート   36 ( 4 )   152 - 156   2018

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (bulletin of university, research institution)   Single Work  

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Industrial Property Rights 【 display / non-display

  • 応力センサー

    山崎貴大、中尾航、古屋泰文、座間誠一

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    Applicant:東北大学、横浜国立大学、フィンガルリンク株式会社

    Application no:2018-037072  Date applied:2018.3.30

    Country of applicant:Domestic  

  • 治癒活性剤を含む酸化誘起型自己治癒セラミックス組成物、その製法及びその用途、並びに酸化誘起型自己治癒セラミックス組成物の高機能化方法

    長田俊郎、鴨田紀一、原徹、三留正則、阿部太一、大村孝仁、中尾航

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    Applicant:物質・材料研究機構、横浜国立大学

    Application no:2017-525216  Date applied:2016.6.13

    Patent/Registration no:6436513  Date issued:2018.11.22

    Country of applicant:Domestic  

  • Oxidation-induced self-healing ceramic composition containing healing activator, method for producing same, use of same, and method for enhancing functionality of oxidation-induced self-healing ceramic composition (US, EU)

    Toshio Osada, Kiichi Kamoda, Masanori Mitome, Toru Hara, Taichi Abe, Yuki Tamagawa, Wataru Nakao, and Takahito Ohmura

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    Application no:PCT/2016/067513  Date applied:2016.6.13

    Country of applicant:Domestic  

  • Carburizing device and carburization method (US, EP, KR, TH, IN, MX)

    Wataru Nakao, Akira Tange, Kouichi Tango, Morimichi Kai

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    Application no:PCT/JP2016/064183  Date applied:2016.5.12

    Country of applicant:Foreign country  

  • 浸炭装置と浸炭方法

    中尾航、丹下彰、丹後公一、甲斐盛通

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    Applicant:日本発条、横浜国立大学

    Application no:2015-101781  Date applied:2015.5.19

    Country of applicant:Domestic  

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Awards 【 display / non-display

  • 部門賞(業績賞)(日本機械学会 機械材料・材料加工部門 )

    2021.11   一般社団法人 日本機械学会 機械材料・材料加工部門  

    Individual or group name of awards:中尾航

  • 若林論文賞

    2019.1   耐火物技術協会  

    Individual or group name of awards:木村奈津子、中尾航

  • 功績賞

    2018.10   日本ばね学会  

    Individual or group name of awards:中尾航

  • 論文賞(日本ばね学会)

    2009.11   日本ばね学会  

    Individual or group name of awards:中尾航

  • 科学技術賞(文部科学大臣表彰)

    2009.4    

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Grant-in-Aid for Scientific Research 【 display / non-display

  • 長繊維強化自己治癒セラミックスにおける損傷成長と自己治癒の競合関係の解明

    2012.4

    科学研究費補助金  Grant-in-Aid for Young Scientists(B)

    Investigator(s):中尾航

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    Grant type:Competitive

  • き裂治癒によるセラミックスの耐熱衝撃性の改善

    2009.4 - 2011.3

    科学研究費補助金  Grant-in-Aid for Scientific Research(B)

    Investigator(s):中尾航

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    Grant type:Competitive

  • 水素貯蔵合金ケミカルアクチュエータの動的運動特性の評価

    2016.4 - 2019.3

    科学研究費補助金  Grant-in-Aid for Scientific Research(C)

    Investigator(s):中尾航

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    Grant type:Competitive

  • 長繊維強化自己治癒セラミックスにおける損傷成長と自己治癒の競合関係の解明

    2012.4 - 2015.3

    科学研究費補助金  Grant-in-Aid for Young Scientists(B)

    Investigator(s):中尾航

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    Grant type:Competitive

Other external funds procured 【 display / non-display

  • 自己治癒性を有する新規耐火物開発を可能とする熱衝撃微細損傷の評価技術

    2014.4 - 2015.3

    Local Government  耐火物技術協会 第9回(2014年度)耐火物研究助成金

    Investigator(s):中尾 航

  • Development of the novel ceramics having self-healing function for turbine blade

    2012.10 - 2020.3

    Japan Science and Technology Agency  Advanced Low Carbon Technology Research and Development Program

    Investigator(s):NAKAO Wataru

  • 中温度域作動を可能とする長繊維強化自己治癒セラミックスの開発

    2011.10 - 2012.9

    Local Government  研究助成

    Investigator(s):中尾航

Presentations 【 display / non-display

  • 無機材料系の自己治癒材料の現状と今後の展望

    中尾 航  [Invited]

    R&D懇話会213回  日本化学会

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    Event date: 2021.1

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:Online  

  • 自己治癒セラミックスの基礎と今後の展望

    中尾 航  [Invited]

    2020年度過熱水蒸気新技術研究会第2回研究会  一般財団法人大阪科学技術センター

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    Event date: 2020.12

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

    Venue:Online  

  • 夢の自己修復材料がものづくり・サービス・ビジネスを刷新する

    中尾航

    テクノロジーNEXT2019  テクノロジーNEXT2019

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    Event date: 2019.5

    Language:Japanese   Presentation type:Oral presentation (general)  

  • Room temperature self-healing function for ceramics using hydration reaction of cement

    SEKINE Nobuhide, NAKAO Wataru

    The Proceedings of the Materials and processing conference  The Japan Society of Mechanical Engineers

    DOI

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    Event date: 2019

    Language:Japanese   Presentation type:Other  

    <p>In this research, a new type of self-healimg mechanism for ceramics is developed. This mechanism is using hydration reaction of cement as a self-healing mechanism and the effictivness of this mechanism is assessed. We developed advanced CMC(Ceramic Matrix Composites) which has self-healing ability. Ceramic matrix is mainly composed of SiO<sub>2</sub> and Al<sub>2</sub>O<sub>3</sub> and self-heling agent which causes chemical reaction is mainly composed of CaO and Al<sub>2</sub>O<sub>3</sub>. This self-healing agent is generally called calcium aluminate cement. When water comes into cracks and contact with the cement, hydration reaction occurs and hydrates fill up the cracks. Self-healing phenomenon can be divided into 3 stages. At the first stage, chemical reaction starts. At the second stage, cracks are filled with products. At the third stage, strength is recoverd. According to this devision, chemical reaction used in the self-healing mechanism can be divided into three elementary reaction. With this idea, a model of self-healing mechanism using hydration reaction is established. As a result, it is suggested that with some additional condition, strength recover is possible. Howevr, full sterength recover seems to be impossibe unless drying shrinkage of hydrates is supressed.</p>

  • Investigation on dynamic fracture behavior of ceramics using silicon nitride

    Sakata Anan, Nakao Wataru

    The Proceedings of the Materials and processing conference  The Japan Society of Mechanical Engineers

    DOI

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    Event date: 2019

    Language:Japanese   Presentation type:Other  

    <p>Foreign object damage(FOD) in ceramic materials is a complicated damage mode that occurs when a foreign object collides with a peripheral blade. In order to investigate this damage mode, an experiment was conducted in which a steel ball collides with fine ceramics silicon nitride using a light gas gun and a ring bending jig. An experiment was conducted to make it collide until it broke, and the condition and number of breaks were investigated. As a result, cracks were damaged at a rate of 55% to 71% of the rate of fracture due to a single impact. In addition, the conditions under which radial cracks were generated by changing the mass of the steel balls were investigated. As a result, it was found that the energy required for destruction increases as the projectile becomes smaller. In considering the resistance to FOD, it is necessary to evaluate ceramic materials not at the speed at which a single collision breaks but at the speed at which radial cracks on the lower speed are introduced.</p>

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Preferred joint research theme 【 display / non-display

  • R&D on novel self-healing ceramics used at high temperatrue

  • オールセラミックス軸受けの開発ーセラミックスの表面改質手法を用いた高機能セラミックス摺動部材の開発

  • Development of advance ceramics having self-crack-healing ability-development of ceramics spring for high temperature use

 

Charge of on-campus class subject 【 display / non-display

  • 2022   Physical Chemistry

    College of Engineering Science

  • 2022   Introduction of multi-functional composites

    Graduate school of Engineering Science

  • 2022   Advanced Materials Engineering

    Graduate school of Engineering Science

  • 2022   Leading-edge Materials Engineering

    Graduate school of Engineering Science

  • 2022   Materials Fabrication Studio

    Graduate school of Engineering Science

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Committee Memberships 【 display / non-display

  • ばね鋼の熱処理及び窒化処理に関する調査委員会

    2012.6 - 2014.3  委員長

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    Committee type:Other 

  • アクティブマテリアルシステム研究会

    2007.9  幹事

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    Committee type:Other 

Social Contribution(Extension lecture) 【 display / non-display

  • 4th International Conference on Self-healing Ceramics

    2013.6

  • 5th International Conference on Self-healing Ceramics

    2015.6

  • ICM&P2011

    2011.6

  • ICM&P2014

    2014.6

  • 論文特集号の巻頭言

    Role(s): Other

    Science and Technology of Advanced Materials  2021.3

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    Audience: University students, Graduate students, Teachers, Researchers, Scientific organization

    Type:Newspaper, magazine

    掲載:Volume 21, 2020 - Issue SHM: Self-Healing
    「Focus on self-healing materials: recent challenges and innovations
    Wataru Nakao, Toshio Osada, Tomoya Nishiwaki & Hideyuki Otsuka
    Originally published in Science and Technology of Advanced Materials, Volume: 22, Number: 1 (31 Dec 2021)
    Page: 234
    Published online: 15 Mar 2021」

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