Details of the Researcher

PHOTO

Yuichi Niibori
Section
Job title
Specially Appointed Professor(Research)
Degree
  • 博士(工学)(東北大学)

Profile

Yuichi Niibori received his B. Eng. (1983) and M. Eng. (1985) in Mineral and Energy Resources Engineering from Tohoku University, Japan. In 1985, he joined its Faculty of Engineering as a Research Associate. He received a Dr. Eng. from Tohoku University in 1993, and served as an Associate Professor at Department of Quantum Science & Energy Engineering from 1996 to 2012, Tohoku University. Within this period, he stayed temporarily at Eidgenössische Technische Hochschule (ETH) Zürich (1999) and University of California Berkeley (2006) as a visiting scholar. He has served as a Professor since April 2012 at Department of Quantum Science & Energy Engineering, Tohoku University. Based on geosphere transport phenomena, chemical reaction engineering and radiochemistry, he is carrying out the fundamental studies on the safety assessment of radioactive waste disposal system. His current research interests include dynamic behavior of radionuclides sorption onto rock surface altered by cementitious materials for the underground repository construction.

Besides, he served also as department chair of Quantum Science & Energy Engineering, Tohoku University from April 2013 to March 2017 and April 2023 to March 2024, as department head of the mechanical & aerospace engineering, the undergraduate school of engineering, Tohoku University from April 2014 to March 2015, and as the director of Division of Nuclear Fuel Cycle and Environment (NUCE), Atomic Energy Society of Japan (AESJ) from April 2014 to March 2015. Moreover, he served as the AESJ vice president from June 2021 to June 2023 and the AESJ president from June 2023 to June 2024. He is now serving as a Special Advisor to Dean of Graduate School of Engineering, Tohoku University, from Aug. 2021 to present.

Research History 13

  • 2025/04 - Present
    Photon Science Innovation Center Vice President

  • 2025/04 - Present
    Tohoku University NanoTerasu Co-Creation Promotion Division, Research Promotion Department Specially Appointed Professor (Research)

  • 2021/08 - 2025/03
    Special Advisor to Dean of Graduate School of Engineering, Tohoku University

  • 2012/04 - 2025/03
    Graduate School of Engineering, Tohoku University Dept. of Quantum Science & Energy Engnieering Professor

  • 2023/04 - 2024/03
    Tohoku University

  • 2013/04 - 2017/03
    Department chair of Quantum Science & Energy Engineering, Tohoku University

  • 2014/04 - 2015/03
    Department head of the mechanical & aerospace engineering, the undergraduate school of engineering, Tohoku University

  • 2007/04 - 2012/03
    Graduate School of Engineering, Tohoku University Dept. of Quantum Science & Energy Engnieering Associate Professor

  • 1997/04 - 2007/03
    Graduate School of Engineering, Tohoku University Dept. of Quantum Science & Energy Engnieering Associate Professor

  • 2006/07 - 2006/10
    University of California, Berkeley Department of Nuclear Engineering Visiting Scholar

  • 1999/10 - 1999/11
    Institute of Geophysics, ETH Zurich Visiting Researcher

  • 1996/04 - 1997/03
    Faculty of Engineering, Tohoku University Dept. of Quantum Science & Energy Engnieering, Associate Professor

  • 1985/04 - 1996/03
    Faculty of Engineering, Tohoku University Dept. of Mineral Resources & Energy Engnieering, Reaearch Associate

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Education 2

  • Tohoku University Graduate School of Engineering Department of Mineral and Energy Resources Engineering

    - 1985/03

  • Tohoku University Faculty of Engineering Department of Mineral and Energy Resources Engineering

    - 1983/03

Committee Memberships 81

  • 文部科学省 国立研究開発法人審議会 委員

    2025/04 - Present

  • 経済産業省 総合資源エネルギー調査会臨時委員(地層処分技術WG)

    2022/11 - Present

  • 環境省 除去土壌の処分に関する検討チーム委員

    2017/09 - Present

  • 原子力規制委員会 バックエンド技術評価検討会委員

    2016/04 - Present

  • 原子力損害賠償・廃炉等支援機構 廃棄物対策専門委員会 主査

    2022/10 - 2025/03

  • Atomic Energy Society of Japan President

    2023/06 - 2024/06

  • 経済産業省 資源エネルギー庁 地層処分研究開発調整会議 外部有識者 主査

    2022/06 - 2023/03

  • 日本原子力学会 標準委員会原子燃料サイクル専門部会 部会長

    2016/06 - 2019/05

  • 内閣府 原子力委員会専門委員

    2016/05 - 2018/05

  • Editorial Board of Journal of Waste Management Editorial Board Member

    2012/10 - 2016/09

  • Division of Nuclear Fuel Cycle and Environment (NUCE), Japan Atomic Energy Society Director

    2015/04 - 2016/03

  • 福島県 廃炉安全確保県民会議 構成員

    2023/06 - Present

  • Japan Atomic Energy Society Fellow

    2020/03 - Present

  • 日本原子力学会 廃炉検討委員会 廃棄物検討分科会 副主査

    2016/06 - Present

  • 文部科学省 国立研究開発法人審議会臨時委員

    2023/04 - 2025/03

  • Japan Atomic Energy Society Board member

    2020/06 - 2024/06

  • Atomic Energy Society of Japan Vice President

    2021/06 - 2023/06

  • 日本原子力学会 経営改善小委員会 副査(2021-2022), 主査(2022-2023)

    2021/06 - 2023/05

  • 日本原子力学会 東北支部 支部長

    2020/05 - 2023/05

  • 日本原子力学会 企画委員会 委員 /委員長(2021)

    2019/06 - 2023/05

  • 日本原子力学会 国際活動委員会 委員長

    2021/06 - 2022/05

  • 日本原子力研究開発機構 安全研究・評価委員会 委員

    2021/10 - 2022/03

  • 日本原子力研究開発機構 地層処分研究開発・評価委員会 委員

    2021/03 - 2022/03

  • 日本原子力学会 NUMO包括的技術報告書レビュー特別専門委員会

    2018/12 - 2020/03

  • 日本原子力学会標準委員会 委員

    2016/06 - 2019/05

  • 日本原子力学会 標準委員会 原子燃料サイクル専門部会 委員

    2007/06 - 2019/05

  • The Geothermal Reserach Society of Japan Councilor

    2002/10 - 2018/09

  • 日本原子力学会標準委員会 原子燃料サイクル部会 副部会長

    2014/08 - 2016/05

  • 日本原子力学会核燃料サイクル専門部会 LLW処分安全評価分科会 副主査

    2010/05 - 2016/05

  • 日本原子力学会 標準委員会原子燃料サイクル専門部会 低レベル放射性廃棄物埋設後管理分科会 主査

    2007/05 - 2016/05

  • Division of Nuclear Fuel Cycle and Environment, Japan Atomic Energy Society Vice Director

    2014/04 - 2015/03

  • 日本原子力学会 福島第一原子力発電所事故により発生する放射性廃棄物の処理・処分 検討委員会 幹事

    2012/04 - 2015/03

  • 日本原子力学会東京電力福島第一原子力発電所に関する調査委員会 委員

    2012/08 - 2014/03

  • 土木学会 特別委員会 放射能汚染廃棄物対策土木技術特定テーマ委員会 委員

    2012/04 - 2012/06

  • 日本原子力学会NUMO2010年技術レポートレビュー特別専門委員会 委員・予算管理者

    2009/12 - 2011/03

  • 日本原子力学会NUMO2010年技術レポートレビュー特別専門委員会 委員・予算管理者

    2009/12 - 2011/03

  • 日本地熱学会 編集委員長

    2006/10 - 2010/09

  • 日本原子力学会 標準委員会原子燃料サイクル専門部会 余裕深度処分安全評価分科会 副主査

    2005/01 - 2010/04

  • 日本原子力学会 標準委員会原子燃料サイクル専門部会 余裕深度処分安全評価分科会 副主査

    2005/01 - 2010/04

  • 日本原子力学会50周年ビジョンマップ検討WG 委員

    2008/06 - 2010/03

  • 日本原子力学会標準委員会核燃料サイクル専門部会 低レベル放射性廃棄物埋設施設検査方法分科会 副主査

    2007/10 - 2010/03

  • 日本原子力学会標準委員会核燃料サイクル専門部会 低レベル放射性廃棄物埋設施設検査方法分科会 副主査

    2007/10 - 2010/03

  • 経済産業省 総合資源エネルギー調査会臨時委員 (原子力部会核燃料サイクル技術検討小委員会)

    2001/04 - 2008/12

  • 日本原子力学会バックエンド部会 運営委員

    2006/04 - 2008/03

  • 日本原子力学会バックエンド部会 運営委員

    2006/04 - 2008/03

  • The Geothermal Reserach Society of Japan 地中熱利用技術専門部会長

    2004/10 - 2006/09

  • 日本地熱学会 地中熱利用技術専門部会長

    2004/10 - 2006/09

  • 日本原子力学会 核燃料サイクルの安全に関するニーズ調査 特別専門委員会 委員

    2005/09 - 2006/03

  • 日本原子力学会 核燃料サイクルの安全に関するニーズ調査 特別専門委員会 委員

    2005/09 - 2006/03

  • Atomic Energy Society of Japan Editor

    2002/04 - 2005/03

  • 日本原子力学会 編集委員・分野責任者

    2002/04 - 2005/03

  • The Mining and Materials Processing Institute of Japan The organizer of Recycle Energy & Resources committee of Tohoku Branch

    1997/04 - 2005/03

  • 資源・素材学会 東北支部リサイクルエネルギー資源専門委員会幹事

    1997/04 - 2005/03

  • The Geothermal Reserach Society of Japan Planning Chair

    2002/10 - 2004/09

  • 日本地熱学会 企画委員長

    2002/10 - 2004/09

  • Atomic Energy Society of Japan Councilor

    2000/11 - 2004/06

  • 日本原子力学会 評議員

    2000/11 - 2004/06

  • Atomic Energy Society of Japan Open School Committee

    2003/04 - 2004/03

  • 日本原子力学会 オープンスクール委員会委員

    2003/04 - 2004/03

  • Atomic Energy Society of Japan Tohoku Branch Organizer

    2000/04 - 2004/03

  • 日本原子力学会 東北支部幹事

    2000/04 - 2004/03

  • The Geothermal Reserach Society of Japan Editor

    1999/10 - 2001/09

  • 日本地熱学会 編集委員

    1999/10 - 2001/09

  • Atomic Energy Society of Japan Reviewer(1999-2001)

    1999/04 - 2001/03

  • 日本原子力学会 査読委員(1999-2001)

    1999/04 - 2001/03

  • The Mining and Materials Processing Institute of Japan Tohoku Branch Organizor

    1998/04 - 1999/03

  • 資源・素材学会 東北支部常議員

    1998/04 - 1999/03

  • The Mining and Materials Processing Institute of Japan Planning board of Tohoku Branch

    1997/04 - 1998/03

  • 資源・素材学会 東北支部企画委員

    1997/04 - 1998/03

  • MIGRATION'97(Sixth International Conference on the CHEMISTRY AND MIGRATION BEHAVIOR OF ACTINIDES AND FISSION PRODUCTS IN THE GEOSPHERE) Conference Organizing Committee

    1997/05 - 1997/10

  • MIGRATION'97(Sixth International Conference on the CHEMISTRY AND MIGRATION BEHAVIOR OF ACTINIDES AND FISSION PRODUCTS IN THE GEOSPHERE) Conference Organizing Committee

    1997/05 - 1997/10

  • 資源・素材'96実行委員会 委員・「地下流動と環境」セッションオーガナイザー

    1996/04 - 1996/10

  • 資源・素材'96実行委員会 委員・「地下流動と環境」セッションオーガナイザー

    1996/04 - 1996/10

  • 平成8年度資源・素材関係学協会合同秋季大会準備委員会 委員

    1995/07 - 1996/03

  • 平成8年度資源・素材関係学協会合同秋季大会準備委員会 委員

    1995/07 - 1996/03

  • 日本地熱学会仙台大会実行委員会 幹事

    1990/04 - 1990/10

  • 日本地熱学会仙台大会実行委員会 幹事

    1990/04 - 1990/10

  • 第3回地下のAE国内コンファレンス現地実行委員会 委員

    1988/04 - 1988/05

  • 第3回地下のAE国内コンファレンス現地実行委員会 委員

    1988/04 - 1988/05

  • The Geothermal Reserach Society of Japan Editor

    1985/10 - 1987/09

  • 日本地熱学会 編集委員会委員

    1985/10 - 1987/09

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Professional Memberships 1

  • Atomic Energy Society of Japan

Research Interests 4

  • 数理解析学

  • Chemical Reaction Engineering

  • Geosphere Transport Phenomena

  • Radioactive Waste

Research Areas 1

  • Energy / Nuclear engineering / Nuclear Geotechnical Engineering

Awards 16

  1. 日本原子力学会バックエンド部会 功績賞

    2022/03

  2. America Nuclear Society(ANS) Best Poster/Paper Awards in 2020 Waste Management Conference

    2020/10 America Nuclear Society Influence of Borate on Sorption of Strontium and Barium to Calcium Silicate Hydrate,

  3. WM 2020 Conference Best Poster Presentation in Track # 4.0- Nuclear Power Plant Waste Management and On-Site SNF/UNF storage (NPP)

    2020/03 WM Symposia Influence of Borate on Sorption of Strontium and Barium to Calcium Silicate Hydrate

  4. Award to Review Committee Member of Research Fellowship of Young Scientists

    2018/07 Japan Society for the Promotion of Science

  5. WM 2018 Conference Best Poster Presentation in Track # 4.0 - Nuclear Power Plant (NPP)

    2018/03 WM Symposia Fundamental Study on Effects of Borate on the Sorption of Cesium ions to Calcium Silicate Hydrate

  6. Best Presentation Award of Division of Nuclear Fuel Cycle and Environment (NUCE), AESJ

    2017/03 日本原子力学会バックエンド部会 地下冠水環境におけるカルシウムシリケート水和物によるバリア機能の評価手法

  7. Best Paper Award of Division of Nuclear Fuel Cycle and Environment (NUCE), AESJ

    2017/03 日本原子力学会バックエンド部会 高塩濃度冠水環境におけるカルシウムシリケート水和物の安定性に関する研究

  8. WM 2013 conference Best Poster Presentation in TRACK 9: SAFETY, SAFEGUARDS & SECURITY

    2013/03 WM Symposia Estimation of Sorption Behavior of Europium(III) Using Biotite Flakes

  9. 日本原子力学会再処理・リサイクル部会セミナー優秀賞

    2012/08/24 日本原子力学会再処理・リサイクル部会 第8回再処理・リサイクル部会セミナー ポスターセッション 優秀賞

  10. NUCE AWARD (by Atomic Energy Soc. Japan, Nuclear Fuel Cycle and Environment)

    2012/03/21 日本原子力学会バックエンド部会 原子力教科書シリーズ「放射性廃棄物の工学」(オーム社)の執筆

  11. 日本原子力研究開発機構 大学との研究協力実施委員会 表彰

    2010/07 日本原子力研究開発機構(JAEA) 大学との研究協力実施委員会 アルカリフロントにおけるコロイド状ケイ酸の動的挙動と核種移行との関係

  12. 日本地熱学会 論文賞

    2008/10 日本地熱学会 地下水流動を考慮した地中熱利用ヒートポンプの実証試験

  13. NUCE AWARD (by Atomic Energy Soc. Japan, Nuclear Fuel Cycle and Environment)

    2008/03 日本原子力学会バックエンド部会 溶解過程を伴う浸透性変化の数学モデルの提案(2007年10月発表)

  14. 日本原子力学会再処理・リサイクル部会セミナーポスター優秀賞

    2007/06/21 日本原子力学会再処理・リサイクル部会 ハイブリッド・ナノ吸着剤による発熱元素(Cs,Sr)の選択的分離・回収

  15. Educational Award, Graduate School Dean of Engineering, Tohoku University

    2007/03 Graduate School of Engineering, Tohoku University Contribution to Creative Engineering Center, Graduate School of Engineering, Tohoku University

  16. The Award of Geothermal Research Society of Japan

    1988/11/10 日本地熱学会 浸透率の分布を考慮した地熱貯留層のシミュレーションに関する研究

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Papers 249

  1. Evaluation of retardation effect for the migration of cesium under unsaturated conditions

    Taiji Chida, Hirotaka Kawakami, Tsugumi Seki, Noriaki Watanabe, Yuichi Niibori

    MRS Advances 2025/01/21

    Publisher: Springer Science and Business Media LLC

    DOI: 10.1557/s43580-025-01132-y  

    ISSN: 2731-5894

    eISSN: 2059-8521

    More details Close

    Abstract This study discussed the migration of cesium (Cs) ions through porous media under unsaturated conditions in the shallow subsurface for the disposal of low-level radioactive waste. In the flow experiments, the column was packed with sand particles and placed horizontally, considering that the water saturation was distributed as uniformly as possible in the flow direction. From X-ray computed tomography observation, assuming that the unsaturated column had two kinds of flow paths, one of which easily flowed (saturated parts) and the other did not (unsaturated parts), this study combined the numerical solutions of two advection–diffusion equations and estimated the retardation coefficient for Cs ions in the column. The retardation coefficients were estimated to be smaller than those obtained in the conventional evaluation. To correct such differences, this study presented an approximate equation between the retardation coefficient and water saturation. Graphical abstract

  2. Reduction in Apparent Permeability Owing to Surface Precipitation of Solutes by Drying Process and Its Effect on Geological Disposal Peer-reviewed

    Tsugumi Seki, Kanta Hongo, Taiji Chida, Yuichi Niibori

    Minerals 14 (4) 428-428 2024/04/20

    Publisher: MDPI AG

    DOI: 10.3390/min14040428  

    eISSN: 2075-163X

    More details Close

    Disposal tunnels in geological repositories are ventilated continuously for over 50 years until their closure. Under these conditions, an unsaturated zone of mixed liquid and gas phases forms around the tunnels. Moreover, drying is assumed to progress from the host rock to the tunnels. To understand these drying processes, this study investigated the migration and precipitation of solutes via capillary forces during drying in packed columns using silica sand or glass beads as packed layers and X-ray CT analysis. In addition, the apparent permeability of a column packed with silica sand containing precipitation was examined using a flow experiment. The results indicate that the precipitation and accumulation of solutes were significant near the drying surfaces of the columns. The apparent mass transfer coefficient at a relatively early stage of the drying process indicates that the migration rate of solutes depends strongly on the capillary forces during the drying process. Furthermore, the apparent permeability of the columns with precipitation decreased significantly. These indicate that the precipitation and accumulation of solutes with drying in the groundwater reduce the porosity and permeability, and the advection of groundwater around the repository may be suppressed.

  3. Evaluation of the Changes in Effective Fracture Aperture with Deposition of Calcium Silicate Hydrate on Granite Surface Under Highly Alkaline Saline Conditions Using a Microflow Cell Peer-reviewed

    Tsugumi Seki, Kazuki Furiya, Taiji Chida, Yuichi Niibori

    ACS ES&T Water 4 (4) 1864-1873 2024/03/28

    Publisher: American Chemical Society (ACS)

    DOI: 10.1021/acsestwater.3c00822  

    ISSN: 2690-0637

    eISSN: 2690-0637

  4. Interaction of europium with calcium silicate hydrate under conditions saturated with groundwater Peer-reviewed

    Taiji Chida, Kengo Suto, Tsugumi Seki, Yuichi Niibori

    Journal of Nuclear Science and Technology 1-10 2024/01/30

    Publisher: Informa UK Limited

    DOI: 10.1080/00223131.2024.2307437  

    ISSN: 0022-3131

    eISSN: 1881-1248

  5. Dynamic behavior of sorption of europium onto biotite flakes under the condition of saline groundwater Peer-reviewed

    Taiji Chida, Tsugumi Seki, Yuto Watanabe, Yuichi Niibori

    MRS Advances 9 462-466 2024/01/22

    Publisher: Springer Science and Business Media LLC

    DOI: 10.1557/s43580-024-00770-y  

    eISSN: 2059-8521

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    Abstract This study discussed the interaction between Eu and biotite in flakes under the coexistence of Na ions, considering saline groundwater. The sorption experiments were conducted by mixing an Eu solution with Na or K ions and biotite flakes at pH 5. Resultantly, the sorption of Eu gradually increased because of the diffusion into the layered structure of biotite flakes. Thereafter, the sorption amount of Eu with Na ions was less than that without Na ions, and Eu was hardly sorbed with K ions. Additionally, the apparent diffusion coefficients were estimated to be in the order of 10−13 m2/s based on a two-dimensional diffusion model. These values were lower than the effective diffusion coefficients in plutonic rock, which are employed to assess the performance of geological disposal systems. This indicates that the sorption of Eu in plutonic rock is restricted by the diffusion process in biotite flakes. Graphical abstract

  6. Sorption behavior of cesium ions to Mg-containing calcium silicate hydrate in a co-precipitation process Peer-reviewed

    Tsugumi Seki, Ryota Oasa, Taiji Chida, Yuichi Niibori

    MRS Advances 9 456-461 2024/01/05

    Publisher: Springer Science and Business Media LLC

    DOI: 10.1557/s43580-023-00757-1  

    eISSN: 2059-8521

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    Abstract The sorption behavior of Cs to Mg-containing calcium silicate hydrate (C–S–H) was examined to consider C–S–H formation under the water-saturated conditions around a radioactive waste repository. The amount of Cs sorption was slightly lower for Mg-containing C–S–H than for C–S–H, because Mg leads to a decrease in sorption sites by facilitating the polymerization of silicate chains. However, the apparent sorption distribution coefficient Kd of Cs on C–S–H with a Ca/Si molar ratio of 0.8 and Mg contents up to 20% was estimated to be 3.4–6.1 mL/g. Furthermore, the amount of Cs sorption was not decreased by the presence of Ba. The apparent Kd obtained in this study was about 10 times higher than that conventionally estimated for host rocks in the plutonic repository, indicating that C–S–H retains the effect of Cs immobilization even when it contains Mg. Graphical abstract

  7. Leaching behavior of arsenic and selenium in coal fly ash by aging treatment and cement mixing Peer-reviewed

    Tsugumi Seki, Yasumasa Ogawa, Koki Ibi, Taiji Chida, Chihiro Inoue, Yuichi Niibori

    Journal of Nuclear Science and Technology 2023

    DOI: 10.1080/00223131.2023.2176378  

    ISSN: 0022-3131

  8. Sorption behavior of cesium and strontium during the formation process of calcium silicate hydrate as a secondary mineral under the condition saturated with groundwater Peer-reviewed

    Tsugumi Seki, Reo Tamura, Taiji Chida, Yuichi Niibori

    MRS Advances 8 224-230 2023/01

    DOI: 10.1557/s43580-022-00488-9  

    eISSN: 2059-8521

  9. Temperature dependencies of deposition behavior of supersaturated Silicic acid in the presence of Magnesium ions Peer-reviewed

    Masahide Izumiura, Taiji Chida, Tsugumi Seki, Yuichi Niibori

    IYNC2022 Conference Proceedings (Paper No. 448) 1-4 2022/11

  10. Influence of Temperature on Sorption Behavior of Europium on Biotite Flakes Peer-reviewed

    Rintaro Kobayashi, Taiji Chida, Tsugumi Seki, Yuichi Niibori

    IYNC2022 Conference Proceedings (Paper No. 441) 1-4 2022/11

  11. Leaching behavior of adsorbed Sr from granular potassium dititanate and its inhibition effect by heat treatment Peer-reviewed

    Koichi Mori, Takaaki Shinohara, Hitoshi Mimura, Taiji Chida, Yuichi Niibori

    Journal of Ion Exchange 33 (2) 17-26 2022/06

    Publisher: Japan Association of Ion Exchange

    DOI: 10.5182/jaie.33.17  

    ISSN: 0915-860X

    eISSN: 1884-3360

  12. Leaching behavior of adsorbed Sr from granular potassium dititanate and its inhibition effect by heat treatment Peer-reviewed

    森浩一, 森浩一, 篠原隆明, 三村均, 千田太詩, 新堀雄一

    日本イオン交換学会誌(Web) 33 (2) 2022

    ISSN: 1884-3360

  13. Sorption Behavior of Cesium on Calcium Silicate Hydrate Gel Formed as Secondary Mineral under the Coexistence Condition of Sulfate Ions Peer-reviewed

    Naoyuki TAMURA, Taiji CHIDA, Seong-Yun KIM, Yuichi NIIBORI

    Transactions of the Atomic Energy Society of Japan 20 (3) 83-99 2021/09

    Publisher: Atomic Energy Society of Japan

    DOI: 10.3327/taesj.j20.017  

    ISSN: 1347-2879

    eISSN: 2186-2931

  14. Sr Adsorption Behavior of Potassium Dititanate in Contaminated Water with Salinity Peer-reviewed

    森浩一, 森浩一, 篠原隆明, 三村均, 千田太詩, 新堀雄一

    日本イオン交換学会誌(Web) 32 (1) 2021

    ISSN: 1884-3360

  15. Sr Adsorption Behavior of Potassium Dititanate in Contaminated Water with Salinity Peer-reviewed

    Koichi Mori, Takaaki Shinohara, Hitoshi Mimura, Taiji Chida, Yuichi Niibori

    Journal of Ion Exchange 32 (1) 15-24 2021/01

    Publisher: Japan Association of Ion Exchange

    DOI: 10.5182/jaie.32.15  

    ISSN: 0915-860X

    eISSN: 1884-3360

  16. EXPERIMENTAL APPROACH FOR UNDERSTANDING THE DYNAMIC BEHAVIORS OF BENTONITE BUFFER PIPING EROSION Peer-reviewed

    Tomoko Ishii, Masahiro Kawakubo, Ichizo Kobayashi, Yuichi Niibori

    Mechanical Engineering Journal 7 (3) 1-11 2020/04

  17. Fundamental Study of Migration Behavior of Cesium under the Unsaturated Condition through One-dimensional Column Simulating Soil around the Disposal Site International-journal Peer-reviewed

    Masayuki Kogure, Takenori Ozutsumi, Yuichi Niibori, Taiji Chida

    Proceedings of WM2020 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) Paper No. 20262 1-8 2020/03

  18. Influences of Mg Ions and Al Ions on Deposition Behavior of Supersaturated Silicic Acid International-journal Peer-reviewed

    Atsushi Ohmukai, Taiji Chida, Yuichi Niibori

    Proceedings of WM2020 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) Paper No. 20261 1-8 2020/03

  19. Estimation of Sorption Behavior of Europium to Calcium Silicate Hydrate by Thermal Analysis– Peer-reviewed

    Kengo Suto, Taiji Chida, Yuichi Niibori

    Proceedings of WM2020 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) Paper No. 20172 1-9 2020/03

  20. Influence of Borate on Sorption of Strontium and Barium to Calcium Silicate Hydrate Peer-reviewed

    Taiji Chida, Naoya Hara, Yuichi Niibori

    Proceedings of WM2020 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) Paper No. 20148 1-8 2020/03

  21. Deposition Behavior of Supersaturated Silicic Acid on the Surfaces of Chlorite and Sericite Around Geological Repository Peer-reviewed

    Tkafumi Saito, Taiji Chida, Yuichi Niibori

    Proceedings of WM2020 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) Papaer No. 20138 1-8 2020/03

  22. Fundamental Study on Transport Model for Radionuclides Under Unsaturated Condition around Near-Surface Underground Peer-reviewed

    Takenori OZUTSUMI, Masayuki KOGURE, Yuichi NIIBORI, Taiji CHIDA

    MRS Advances 5-6 223-232 2020/01

    DOI: 10.1557/adv.2020.54  

  23. Preliminary Study on Sorption Behavior of Iodine on Ca-Al-Si Hydrate Peer-reviewed

    Rintaro Nagahora, Yuichi Niibori, Taiji Chida

    Proceedings of WM2019 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper ID. 19310) 1-9 2019/03

  24. Estimation of Sorption Behavior of Europium onto Ca-Al-Si Hydrate by Fluorescence Analysis Peer-reviewed

    Yayoi Taneichi, Taiji Chida, Yuichi Niibori

    Proceedings of WM2019 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper ID. 19222) 1-10 2019/03

  25. Alteration of Granite Surface with the Formation of Calcium-Silicate-Hydrate by Alkaline Groundwater Peer-reviewed

    Taiji Chida, Masayuki Hayashi, Yuichi Niibori

    Proceedings of WM2019 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper ID. 19165) 1-9 2019/03

  26. Estimation of Deposition Behavior of Supersaturated Silicic Acid around Geological Disposal Facility Peer-reviewed

    Shogo Tanaka, Yuichi Niibori, Taiji Chida

    Proceedings of WM2019 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper ID. 19137) 1-6 2019/03

  27. Fundamental Study on Sorption Behavior of Europium to Mica Flakes Peer-reviewed

    Masaya Ishijima, Taiji Chida, Yuichi Niibori

    Proceedings of WM2019 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper ID. 19116) 1-9 2019/03

  28. Dependencies of flow velocity on migration behavior of radionuclides in an unsaturated zone around near-surface underground

    Takenori Ozutsumi, Yuichi Niibori, Taiji Chida

    PBNC 2018 - Pacific Basin Nuclear Conference 353-359 2019

    Publisher: American Nuclear Society

  29. Deposition rate of supersaturated silicic acid on Na-type bentonite as a tunnel backfill material Peer-reviewed

    Tsuyoshi Sasagawa, Taiji Chida, Yuichi Niibori

    Applied Geochemistry 98 377-382 2018/10

    DOI: 10.1016/j.apgeochem.2018.08.007  

    ISSN: 0883-2927

  30. High burn-up operation and MOX burning in LWR; Effects of burn-up and extended cooling period of spent fuel on vitrification and disposal Peer-reviewed

    Kota Kawai, Hiroshi Sagara, Kenji Takeshita, Masahiro Kawakubo, Hidekazu, Asano, Yaohiro Inagaki, Yuichi Niibori, Seichi Sato

    Journal of Nuclear Science and Technology 55 (10) 1130-1140 2018/10

    DOI: 10.1080/00223131.2018.1480427  

    ISSN: 0022-3131

  31. Dependencies of flow velocity on migration behavior of radionuclides in an unsaturated zone around near-surface Peer-reviewed

    Takenori Ozutsumi, Yuichi Niibori, Taiji Chida

    Proceedings of 2018 Pacific Basin Nuclear Conference (Paper No. 25877) 1-7 2018/09

  32. Fundamental Study on Effects of Borate on the Sorption of Cesium ions to Calcium Silicate Hydrate Peer-reviewed

    Naoya Hara, Taiji Chida, Yuichi Niibori

    Proceedings of WM2018 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper ID. 18068) 1-9 2018/03

  33. Deposition Behavior of Supersaturated Silicic Acid onto Illite as an Altered Backfilling Material Peer-reviewed

    Shinya Oyama, Tsuyoshi Sasagawa, Taiji Chida, Yuichi Niibori

    Proceedings of WM2018 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper ID. 18114) 1-8 2018/03

  34. Sorption Behavior of Iodate Ions on Calcium Silicate Hydrate under a High Saline Condition Peer-reviewed

    Hayato Onodera, Taiji Chida, Yuichi Niibori

    Proceedings of WM2018 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper ID. 18176) 1-12 2018/03

  35. Sorption of Cationic Radionuclides on Chlorite and Sericite formed by the Hydrothermal Alteration Peer-reviewed

    Taiji Chida, Tomoyuki Toyota, Yuichi Niibori

    Proceedings of WM2018 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper ID. 18180) 1-9 2018/03

  36. Effects of Supersaturated Silicic Acid Concentration on Deposition Rate Around Geological Disposal System Peer-reviewed

    Tsuyoshi Sasagawa, Taiji Chida, Yuichi Niibori

    Journal of Nuclear Engineering and Radiation Science 3 (4) , 041010, 1-6 2017/10/01

    Publisher: American Society of Mechanical Engineers (ASME)

    DOI: 10.1115/1.4037163  

    ISSN: 2332-8975 2332-8983

    eISSN: 2332-8975

  37. Effects of high burn-up operation and extended cooling period of spent fuel on vitrification and storage period Peer-reviewed

    Kota KAWAI, Hiroshi SAGARA, Kenji TAKESHITA, Masahiro KAWAKUBO, Hidekazu ASANO, Yaohiro INAGAKI, Yuichi NIIBORI, Seichi SATO

    Proceedings of ICAPP 2017 (2017 International Congress on Advances in Nuclear Power Plants) (Paper ID 17749) 1-9 2017/04

  38. Flow Rate Dependency of Permeability Changes with the Deposition of CSH under the Highly Alkaline Ca-rich Condition Peer-reviewed

    Daiki Kurata, Taiji Chida, Yuichi Niibori

    Proceedings of WM2017 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper ID. 17175) 1-9 2017/03/05

  39. Estimation of Cs Migration under an Unsaturated Condition by Parallel-plate Experiments and 2D Advection- dispersion Model Peer-reviewed

    Takumi Nemoto, Takenori Ozutsumi, Taiji Chida, Yuichi Niibori

    Proceedings of WM2017 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper ID. 17188) 1-10 2017/03/05

  40. Sorption Behavior of Iodide Ions on Calcium Silicate Hydrate Formed under the Condition saturated with Saline Water Peer-reviewed

    Hirotaka Tago, Yuichi Niibori, Taiji Chida

    Proceedings of WM2017 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper ID. 17069) 1-10 2017/03/05

  41. Sorption Behavior of Cesium Ions on Calcium Aluminosilicate Hydrate under the Condition Saturated with Saline Water Peer-reviewed

    Hisatoshi Kasahara, Taiji Chida, Yuichi Niibori

    Proceedings of WM2017 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper ID. 17096) 1-10 2017/03/05

  42. Influence of Calcium Concentration on Permeability Changes in Flow-paths Altered by Highly Alkaline Groundwater Peer-reviewed

    Ryo Tashiro, Daiki Kurata, Yuichi Niibori, Taiji Chida

    Proceedings of WM2017 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper ID. 17129) 1-10 2017/03/05

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    Superior paper at the WM2017 Conference, Paper # 17129 “Influence of Calcium Concentration on Permeability Changes in Flow-paths Altered by Highly Alkaline Groundwater” presented in Session # 032D Deep Geological Disposal For Radioactive Waste/ Used Fuel.

  43. Sorption Behavior of Cationic Radionuclides on Biotite Flakes at pH 5 Peer-reviewed

    Taiji Chida, Tomoyuki Toyota, Yuichi Niibori

    Proceedings of WM2017 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper ID 17326) 1-9 2017/03

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    Superior paper at the WM2017 Conference, Deep Geological Disposal For Radioactive Waste/ Used Fuel

  44. Development of a method of safety assessment for geological disposal considering long-term evolution of geological and topographical environment by uplift and erosion Peer-reviewed

    Keiichiro Wakasugi, Masaaki Yamaguchi, Shigeru Koo, Fumiya Nagao, Tomoko Kato, Yuji Suzuki, Takeshi Ebashi, Hiroyuki Umeki, Yuichi Nii Bori

    Transactions of the Atomic Energy Society of Japan 16 (1) 15-33 2017

    Publisher: Atomic Energy Society of Japan

    DOI: 10.3327/taesj.J16.010  

    ISSN: 2186-2931 1347-2879

  45. Sorption Behavior of Cesium on Calcium Silicate Hydrate under High Carbonate Ion Concentration Conditions Peer-reviewed

    Naoyuki Tamura, Taiji Chida, Yuichi Niibori, Seong-Yun Kim

    Energy Procedia 131 203-207 2017

    Publisher: Elsevier Ltd

    DOI: 10.1016/j.egypro.2017.09.428  

    ISSN: 1876-6102

  46. Fractional diffusion modeling of heat transfer in porous and fractured media Peer-reviewed

    Anna Suzuki, Sergei A. Fomin, Vladimir A. Chugunov, Yuichi Niibori, Toshiyuki Hashida

    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 103 611-618 2016/12

    DOI: 10.1016/j.ijheatmasstransfer.2016.08.002  

    ISSN: 0017-9310

    eISSN: 1879-2189

  47. Overview of the Fundamental Research and Human Resource Development for the Decommissioning of Fukushima Daiichi Nuclear Power Station in Japan Peer-reviewed

    Yutaka Watanabe, Takayuki Aoki, Yuichi Niibori, Toru Obara, Isamu Sato, Saishun Yamazaki, Koji Okamoto, Shunichi Suzuki, Yusuke Tamura

    Proceedings of the 206 International Conference on Maintenance Science and Technology FC1-1 2016/11

  48. Deposition Behavior of Supersaturated Silicic Acid on Ca-type Bentonite in Geological Disposal System Peer-reviewed

    Tsuyoshi Sasagawa, Taiji Chida, Yuichi Niibori

    Proceedings of WM2016 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper ID 16033) 1-8 2016/03/07

  49. Migration Rates of Some Cations in Unsaturated Layer around the Near-Surface Disposal Facilities of Radioactive Wastes Peer-reviewed

    Takenori Ozutsumi, Yuichi Niibori, Taiji Chida

    Proceedings of WM2016 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper ID 16116) 1-8 2016/03/07

  50. Alteration Behavior of Granite Minerals Forming Calcium Silicate Hydrate under a Ca-Rich Highly Akaline Condition Peer-reviewed

    Hiten Fujita, Ryo Tashiro, Taiji Chida, Yuichi Niibori

    Proceedings of WM2016 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper ID 16160) 1-8 2016/03/07

  51. Interaction of Cesium and Barium Ions with Calcium Silicate Hydrate under a Geological Temperature Condition Peer-reviewed

    Taiji Chida, Yuta Saito, Yuichi Niibori

    Proceedings of WM2016 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper ID 16239) 1-9 2016/03/07

  52. EVALUATION OF RETARDATION EFFECT OF CESIUM IONS THROUGH GROUNDWATER UNSATURATED ZONE Peer-reviewed

    Takenori Ozutsumi, Yuichi Niibori, Taiji Chida

    PROCEEDINGS OF THE 24TH INTERNATIONAL CONFERENCE ON NUCLEAR ENGINEERING, 2016, VOL 4 (Paper ID 60979) 1-8 2016

    DOI: 10.1115/ICONE24-60979  

  53. EFFECTS OF TEMPERATURE ON DEPOSITION RATE OF SUPERSATURATED SILICIC ACID ON CA-TYPE BENTONITE Peer-reviewed

    Tsuyoshi Sasagawa, Taiji Chida, Yuichi Niibori

    PROCEEDINGS OF THE 24TH INTERNATIONAL CONFERENCE ON NUCLEAR ENGINEERING, 2016, VOL 5 11 559-568 2016

    DOI: 10.17265/1934-8975/2017.09.001  

  54. Stability of calcium-silicate-hydrate in the condition saturated highly saline water Peer-reviewed

    Taiji CHIDA, Taihei FUNABASHI, Yuta SAITO, Yuichi NIIBORI

    Journal of Nuclear Fuel Cycle and Environent 22 (2) 29-36 2015/09/14

    Publisher: Division of Nuclear Fuel Cycle and Environment, Atomic Energy Society of Japan

    DOI: 10.3327/jnuce.22.2_29  

    ISSN: 1884-7579

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    http://nuce.aesj.or.jp/jnuce/In-Press/Jnuce-In-Press-150114.pdf<br /> ISSN 1884-7579

  55. Prediction of reinjection effects in fault-related subsidiary structures by using fractional derivative-based mathematical models for sustainable design of geothermal reservoirs Peer-reviewed

    Anna Suzuki, Yuichi Niibori, Sergei Fomin, Vladimir Chugunov, Toshiyuki Hashida

    GEOTHERMICS 57 196-204 2015/09

    DOI: 10.1016/j.geothermics.2015.04.001  

    ISSN: 0375-6505

    eISSN: 1879-3576

  56. ICONE23-1223 EFFECTS OF SUPERSATURATED SILICIC ACID CONCENTRATION ON DEPOSITION RATE AROUND GEOLOGICAL DISPOSAL SYSTEM Peer-reviewed

    Sasagawa Tsuyoshi, Chida Taiji, Niibori Yuichi, Mimura Hitoshi

    Proceedings of the ... International Conference on Nuclear Engineering. Book of abstracts : ICONE 2015 (23) "ICONE23-1223-1"-"ICONE23-1223-8" 2015/05/17

    Publisher: The Japan Society of Mechanical Engineers

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    Cementitious materials for the construction of the geological repository of radioactive wastes alter the pH of groundwater to the highly alkaline condition (pH&ap;13). While this alkaline groundwater dissolves silicate minerals, the soluble silicic acid polymerizes or deposits on the surface of rock with the decrease in pH by mixing with the surrounding groundwater (pH=8). Especially, the deposition of silicic acid leads a clogging effect in flow-paths, which retards the migration of radionuclide. This study estimated the clogging of silicic acid in flow-paths with one-dimensional advection-dispersion model considering the deposition rate constants evaluated in the authors' previous study. In these estimations, the initial supersaturated concentration of silicic acid and the density of deposited minerals were focused as some of the most important parameters. As a result, the aperture of flow-paths (initial width: 0.1 mm, flow-rate: 5 m/year, initial supersaturated concentration: 0.01, 0.1 and 1.0 mM) was clogged within about 200 years by the deposition of silicic acid. The period for the clogging became shorter under the conditions of higher initial supersaturated concentration and lower density of deposited minerals. In other words, the use of cementitious materials for constructing the repository might bring a retardation effect of radionuclide migration by the deposition/clogging processes of the supersaturated silicic acid.

  57. Characterization of Mass/Heat Transfer in Fractured Geothermal Reservoirs by Means of Mathematical Model for Complex Systems Peer-reviewed

    Anna SUZUKI, Yuichi NIIBORI, Sergei A. FOMIN, Vladimir A. CHUGUNOV, Toshiyuki HASHIDA

    Proceedings World Geothermal Congress 2015 (No.22074) 1-10 2015/04

  58. Interactions of Cesium and Barium Ions with Calcium Silicate Hydrate under the Condition Saturated with Saline Water Peer-reviewed

    Yuta Saito, Taiji Chida, Yuichi Niibori, Hitoshi Mimura

    Proceedings of WM2015 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper No. 15247) 1-10 2015/03

  59. Influences of Temperature on Permeability Changes of Flow-paths Altered by Highly Alkaline Ca-rich Groundwater Peer-reviewed

    Taiji Chida, Daiki Kurata, Yuichi Niibori, Hitoshi Mimura

    Proceedings of WM2015 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper No. 15192) 1-7 2015/03

  60. Effects of pH on Deposition Rate of Supersaturated Silicic Acid around Geological Disposal System Peer-reviewed

    Tsuyoshi Sasagawa, Taiji Chida, Yuichi Niibori, Hitoshi Mimura

    Proceedings of WM2015 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper No. 15245) 1-9 2015/03

  61. Selective Separation of Sr by Potassium Titanates from Solution of Nitrate Peer-reviewed

    Hitoshi Kanda, Hitoshi Mimura, Yuichi Niibori, Mamoru Iwasaki, Koichi Mori

    Proceedings of WM2015 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper No. 15248) 1-9 2015/03

  62. Separation of Am and Cm by using TODGA and DOODA(C8) adsorbents with hydrophilic ligand-nitric acid solution Peer-reviewed

    Shigekazu Usuda, Kei Yamanishi, Hitoshi Mimura, Yuji Sasaki, Akira Kirishima, Nobuaki Sato, Yuichi Niibori

    JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY 303 (2) 1351-1355 2015/02

    DOI: 10.1007/s10967-014-3481-7  

    ISSN: 0236-5731

    eISSN: 1588-2780

  63. Characterization of Tracer Responses in Fractured Geothermal Reservoirs Based on Fractional Derivative Mathematical Model for Estimation of Fracture Distribution in Geothermal Reservoirs Peer-reviewed

    Hiroshi MAKITA, Anna SUZUKI, Takumi IWAGAKI, Yuichi NIIBORI, Toshiyuki HASHIDA

    Journal of the Mining and Materials Processing Insttute of Japan 131 (1) 1-8 2015/01

    DOI: 10.2473/journalofmmij.131.1  

  64. Analysis of Water Injection in Fractured Reservoirs Using a Fractional-Derivative-Based Mass and Heat Transfer Model Peer-reviewed

    Anna Suzuki, Yuichi Niibori, Sergei A. Fomin, Vladimir A. Chugunov, Toshiyuki Hashida

    MATHEMATICAL GEOSCIENCES 47 (1) 31-49 2015/01

    DOI: 10.1007/s11004-014-9522-5  

    ISSN: 1874-8961

    eISSN: 1874-8953

  65. Fractional derivative-based tracer analysis method for the characterization of mass transport in fractured geothermal reservoirs Peer-reviewed

    Anna Suzuki, Yuichi Niibori, Sergei A. Fomin, Vladimir A. Chugunov, Toshiyuki Hashida

    GEOTHERMICS 53 125-132 2015/01

    DOI: 10.1016/j.geothermics.2014.05.003  

    ISSN: 0375-6505

    eISSN: 1879-3576

  66. Evaluation of sorption behavior of iodide ions on calcium sificate hydrate and hydrotalcite Peer-reviewed

    Taiji Chida, Jun Furuya, Yuichi Niibori, Hitoshi Mimura

    Materials Research Society Symposium Proceedings 1744 (mrsf14-1744-ee08-09) 29-34 2015

    Publisher: Materials Research Society

    DOI: 10.1557/opl.2015.336  

    ISSN: 0272-9172

  67. Selective adsorption and stable solidification of radioactive cesium ions by porous silica gels loaded with insoluble ferrocyanides Peer-reviewed

    Yin XiangBiao, Wu Yan, Hitoshi Mimura, Yuichi Niibori, Wei YueZhou

    SCIENCE CHINA-CHEMISTRY 57 (11) 1470-1476 2014/11

    DOI: 10.1007/s11426-014-5211-y  

    ISSN: 1674-7291

    eISSN: 1869-1870

  68. Development of mathematical heat transfer model toward design of reinjection for sustainable geothermal extraction Peer-reviewed

    Suzuki Anna, Niibori Yuichi, Fomin Sergei A, Chugunov Vladimir A, Hashida Toshiyuki

    Proceedings of Grand Renewable Energy 2014 International Conference and Exhibition 2014/08

  69. Chromatographic Separation of Nuclear Rare Metals by Highly Functional Xerogels Peer-reviewed

    Takashi ONISHI, Shin-ichi KOYAMA, Rana Syed MASUD, Takuya KAWAMURA, Hitoshi MIMURA, Yuichi NIIBORI

    J. ION EXCHANGE 25 (4) 220-227 2014/08/01

    DOI: 10.5182/jaie.25.220  

  70. Estimation of Permeability Changes due to Contact with Highly Alkaline Ca-rich Solution by Micro Flow-Cell of Granite Chip Peer-reviewed

    Daiki Kurata, Taiji Chida, Yuichi Niibori, Hitoshi Mimura

    Proceedings of WM2014 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper No. 14094) 1-9 2014/03

  71. Raman Spectra of Calcium Silicate Hydrates Sorbing Iodine Ions in Saline Groundwater Peer-reviewed

    Jun Furuya, Taiji Chida, Yuichi Niibori, Hitoshi Mimura

    Proceedings of WM2014 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper No. 14077) 1-14 2014/03

  72. The Influence of Calcium Ions on Migration of Colloidal Silicic Acid in the Presence of Solid phase Peer-reviewed

    Taiji Chida, Yuichi Niibori, Hitoshi Mimura

    Proceedings of WM2014 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper No. 14123) 1-10 2014/03

  73. Characterization of Mass/Heat Transfer in Fractured Geothermal Reservoirs Using Mathematical Model of Complex Dynamical System Peer-reviewed

    Anna. Suzuki, Yuichi. NIIBORI, Sergei. A. FOMIN, Vladimir. A. CHUGUNOV, Toshiyuki. HASHIDA

    Proceedings of Stanford Geothermal Reservoir Engineering Workshop 39 1-9 2014/02

  74. Deposition behavior of supersaturated silicic acid in the condition of relatively high Ca or Na concentration Peer-reviewed

    Taiji Chida, Yuichi Niibori, Hayata Shinmura, Hitoshi Mimura

    Materials Research Society Symposium Proceedings 1665 55-60 2014

    Publisher: Materials Research Society

    DOI: 10.1557/opl.2014.628  

    ISSN: 0272-9172

  75. SELECTIVE UPTAKE OF SR AND STABLE SOLIDIFICATION USING POTASSIUM TITANATES Peer-reviewed

    Hitoshi Kanda, Hitoshi Mimura, Yuichi Niibori, Mamoru Iwasaki, Koichi Mori, Nobuki Itoi, Toshiki Goto

    PROCEEDINGS OF THE 22ND INTERNATIONAL CONFERENCE ON NUCLEAR ENGINEERING - 2014, VOL 5 ICONE22-30289 1-6 2014

    DOI: 10.1115/ICONE22-30289  

  76. FLUORESCENCE EMISSION BEHAVIOR OF Eu(III) SORBED ON CALCIUM SILICATE HYDRATES FORMED WITH NO DRIED PROCESS Peer-reviewed

    Yuichi Niibori, Masayuki Narita, Akira Kirishima, Taiji Chida, Hitoshi Mimura

    PROCEEDINGS OF THE 21ST INTERNATIONAL CONFERENCE ON NUCLEAR ENGINEERING - 2013, VOL 5 1 (4) 1-7 2014

    DOI: 10.1299/mej.2014tep0027  

  77. A DOUBLE POROSITY MODEL TO DESCRIBE BOTH PERMEABILITY CHANGE AND DISSOLUTION PROCESSES Peer-reviewed

    Yuichi Niibori, Hideo Usui, Taiji Chida, Hitoshi Mimura

    PROCEEDINGS OF THE 22ND INTERNATIONAL CONFERENCE ON NUCLEAR ENGINEERING - 2014, VOL 4 2 (5) 1-11 2014

    DOI: 10.1299/mej.15-00210  

  78. Modeling mass and heat transfer in geothermal reservoirs using fractional differential equations

    Suzuki Anna, Horne Ronald N, Makita Hiroshi, Niibori Yuichi, Fomin Sergei, Chugunov Vladimir, Hashida Toshiyuki

    Proceedings of the 10th International Conference on Flow Dynamics 2013/11

  79. A Study of Prediction of Tracer Response at Different Inter-well Distances Using Fractional Advection-Dispersion Equation Peer-reviewed

    Anna SUZUKI, Hiroshi MAKITA, Yuichi NIIBORI, Toshiyuki HASHIDA

    J. Geothermal Res. Soc. Japan 35 (4) 149-161 2013/10

    Publisher: THE GEOTHERMAL RESEARCH SOCIETY OF JAPAN

    DOI: 10.11367/grsj.35.149  

    ISSN: 0388-6735

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    Use of fractional Advection-Dispersion Equation (fADE) has been proposed to describe mass transport in a fractured reservoir. In this study, a finite discrete method to solve the fADE is developed and its accuracy is tested against analytical solutions.<br>Tracer simulation is carried out using a 3D simulation code for flow analysis (FRACSIM-3D). The fADE mathematical model is applied to fit the numerical tracer results, which show highly anomalous behaviors such as a long tail. The solution to the fADE including a spatial fractional derivative is shown to be in reasonable agreement with the tracer response produced by FRACSIM-3D. The fitting parameters of the fADE equation obtained for well interval of 50 m are used to make predictions of tracer responses for well intervals of 100 m - 500 m. It has been shown that the tracer responses predicted by the fADE model are reasonable close to those obtained by FRACSIM-3D irrespective of the different well intervals. This study demonstrates that the fADE offers a method for predicting tracer responses in a fractured reservoir.

  80. Chromatographic Separation Behaviors of Am, Cm, and Eu onto TODGA and DOODA(C8) Adsorbents with Hydrophilic Ligand-Nitric Acid Eluents Peer-reviewed

    Shigekazu Usuda, Kei Yamanishi, Hitoshi Mimura, Yuji Sasaki, Akira Kirishima, Nobuaki Sato, Yuichi Niibori

    CHEMISTRY LETTERS 42 (10) 1220-1222 2013/10

    DOI: 10.1246/cl.130476  

    ISSN: 0366-7022

    eISSN: 1348-0715

  81. Selective Adsorption and Stable Solidification of Radioactive Cesium Ions Peer-reviewed

    Hitoshi Mimura, Pham Luong Thi Quynh, Yuichi Niibori, Yuki Ikarashi, Yan Wu, Yue-Zhou Wei

    Proceedings of THE 15th INTERNATIONAL CONFERENCE ON ENVIRONMENTAL REMEDIATION AND RADIOACTIVE WASTE MANAGEMENT ICEM2013-96130 1-8 2013/09/12

  82. The present situation and future prospects of groundwater colloids studies on the performance assessment of geological disposal of radioactive wastes in Japan Peer-reviewed

    Seiya NAGAO, Yuichi NIIBORI, Tadao TANAKA, Takayuki SASAKI, Takumi SAITO, Akira KIRISHIMA, Hideki YOSHIKAWA, Kazuki IIJIMA, Katsuhiro HAMA, Teruki IWATSUKI, Yoshio TAKAHASHI, Yasuhisa ADACHI, Yohey SUZUKI, Yoshio WATANABE

    原子力バックエンド研究 20 (1) 3-14 2013/06/15

    Publisher: Division of Nuclear Fuel Cycle and Environment, Atomic Energy Society of Japan

    DOI: 10.3327/jnuce.20.3  

    ISSN: 1884-7579

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    &nbsp;&nbsp;This paper shows a current status of groundwater colloids studies on the performance assessment of geological disposal of radioactive wastes in Japan, and summaries realistic approach of the colloids studies at a substantial research network for Japanese universities and institutes.

  83. Fundamental Study on Temperature Dependence of Deposition Rate of Silicic Acid Peer-reviewed

    Hayata Shinmura, Yuichi Niibori, Hitoshi Mimura

    Proceedings of WM2013 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper No. 13270) 1-13 2013/03

  84. Estimation of Sorption Behavior of Europium(III) Using Biotite Flakes Peer-reviewed

    Go Sasaki, Yuichi Niibori, Akira Kirishima, Hitoshi Mimura

    Proceedings of WM2013 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper No. 13272) 1-11 2013/03

  85. Evaluation of Adsorption Properties for Cs and Sr Selective Adsorbents Peer-reviewed

    Tomonori Nakai, Hitoshi Mimura, Syunya Wakabayashi, Yuichi Niibori, Hiroshi Tanigawa, Eiji Ishizaki, Fumio Kurosaki, Minoru Matsukura

    Proceedings of WM2013 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) (Paper No. 13171) 1-8 2013/02/28

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    WM2013 Conference, February 24-28, 2013, Phoenix, Arizona, USA

  86. Some experiments on sorption behavior of iodide ions into CSH gel under the condition saturated with saline groundwater Peer-reviewed

    Yuichi Niibori, Taihei Funabashi, Hitoshi Mimura

    Materials Research Society Symposium Proceedings 1518 (mrsf12-1518-ll13-04) 225-230 2013

    DOI: 10.1557/opl.2012.1715  

    ISSN: 0272-9172

  87. Development of Fractional Derivative-Based Mass and Heat Transport Model

    A. Suzuki, R. Horne, H. Makita, Y. Niibori, S. Fomin, V. Chugunov, T. Hashida

    Proceedings of Thirty-Eighth Workshop on Geothermal Reservoir Engineering (Stanford University) 38 343-348 2013/01

  88. Chromatographic separation of Cs in simulated high-level liquid wastes Peer-reviewed

    Takuya Kawamura, Takashi Ohnishi, Rana Syed Masud, Yan Wu, Hitoshi Mimura, Yuichi Niibori

    Energy Procedia 39 328-336 2013

    Publisher: Elsevier Ltd

    DOI: 10.1016/j.egypro.2013.07.220  

    ISSN: 1876-6102

  89. Characterization of Tracer Responses Using Fractional Derivative-Based Mathematical Model and Its Application to Prediction of Mass Transport in Fractured Reservoirs Peer-reviewed

    Anna Suzuki, Hiroshi Makita, Yuichi Niibori, Sergei A. Fomin, Vladimir A. Chugunov, Toshiyuki Hashida

    GRC Transactions 36 1391-1396 2012/12

  90. Separation of Re(VII) and Tc(VII) in simulated HLLW using a column packed with xerogel microcapsules enclosing MIDOA extractants Peer-reviewed

    Rana Syed Masud, H. Mimura, T. Sugimori, Y. Niibori, Y. Sasaki

    Fuelling the Future: Advances in Science and Technologies for Energy Generation Transmission and Storage, edited by A. Mendez-Vilas 440-444 2012/12/01

  91. Uptake properties of Re(VII) and Tc(VII) for xerogel microcapsules enclosing MIDOA extractants Peer-reviewed

    H. Mimura, T. Sugumori, Rana Syed Masud, Y. Niibori, Y. Sasaki

    Fuelling the Future: Advances in Science and Technologies for Energy Generation Transmission and Storage, edited by A. Mendez-Vilas 452-456 2012/12/01

  92. Selective Adsorption of Palladium by Norvel Xerogels Enclosing Insoluble Copper Ferrocyanides Peer-reviewed

    Hitoshi Mimura, Takenori Kuzumaki, Yuichi Niibori

    Proceedings of International Confference on Ion Exchange (IEX2012) 1-12 2012/09/21

  93. Characterization of Fluid Flow in Fractured Geothermal Reservoirs based on Fractional Derivative Mathematical Model Peer-reviewed

    Hiroshi Makita, Anna Suzuki, Yuichi Niibori, Toshiyuki Hashida

    Proceedings of Ninth International Conference on Flow Dynamics, September 19-21, 2012, Sendai, Miyagi, Japan, (2012), 664-665 664-665 2012/09/19

  94. Study on adsorption behavior of cesium using ammonium tungstophosphate (AWP)-calcium alginate microcapsules Peer-reviewed

    Wu Yan, Hitoshi Mimura, Yuichi Niibori, Takashi Ohnishi, Shinichi Koyama, Wei YueZhou

    SCIENCE CHINA-CHEMISTRY 55 (9) 1719-1725 2012/09

    DOI: 10.1007/s11426-012-4696-5  

    ISSN: 1674-7291

  95. Selective Separation of Molybdenum by Highly Functional Xerogels Enclosing LIX63 Extractant Peer-reviewed

    Shunsuke Susa, Toshiaki Sugimori, Syed Masud Rana, Hiroshi Mimura, Yuichi Niibori

    Proceedings of International Conference of Ion Exchange (IEX2012) 1-9 2012/09

  96. Selective Adsorption and Recovery of Au(III) by Alginate Gel Polymer Microcapsules Enclosing TOA Extractant Peer-reviewed

    Syed Masud Rana, Hitoshi Mimura, Yuichi Niibori

    Proceedings of International Confference on Ion Exchange (IEX2012) 1-10 2012/09

  97. Some Fundamental Experiments on Apparent Dissolution Rate of Gas Phase in the Groundwater Recovery Processes of the Geological Disposal System Peer-reviewed

    Taiki Yoshii, Yuichi Niibori, Hitoshi Mimura

    Proceedings of WM2012 Conference (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management), February 26- March 1 2012 Phoenix, USA (CD-ROM) (Paper ID. 12146) 1-9 2012/06/30

  98. Sorption Behavior of Eu(III) into CSH Gel in Imitated Saline Groundwater Peer-reviewed

    Taihei Funabashi, Yuichi Niibori, Hitoshi Mimura

    Proceedings of WM2012 Conference (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management), February 26- March 1 2012 Phoenix, USA (CD-ROM) (Paper No. 12145) 1-11 2012/06/30

  99. Selective uptake of caesium by mordenite enclosing AMP microcapsules Peer-reviewed

    Shun Kanome, Hiroshi Mimura, Yuichi Niibori

    Eleventh Information Exchange Meeting on ACTINIDE AND FISSION PRODUCT PARTITIONING AND TRANSMUTATION 1-9 2012/06

  100. Immobilisation of caesium by zeolites and characterisation of ceramic solid forms Peer-reviewed

    Shin Tomiyama, Hitoshi Mimura, Yuichi Niibori, Isao Yamagishi, Yasuji Morita

    Eleventh Information Exchange Meeting on ACTINIDE AND FISSION PRODUCT PARTITIONING AND TRANSMUTATION 1-10 2012/06

  101. Selective Separation of Au(III) by the Column of Alginate Xerogel Microcapsules Enclosing TOA Extractant Peer-reviewed

    Rana Syed Masud, Hitoshi Mimura, Yuichi Niibori

    Journal of Chemistry and Chemical Engineering 6 (2) 462-469 2012/06

  102. A Calculation of Spatial Range of Colloidal Silicic Acid Deposited Downstream from the Alkali Front Peer-reviewed

    Yuichi Niibori, Kazuki Iijima, Naoyuki Tamura, Hitoshi Mimura

    Jonrnal of Power and Energy Systems 6 (2) 140-150 2012/06

    Publisher: The Japan Society of Mechanical Engineers

    DOI: 10.1299/jpes.6.140  

    ISSN: 1881-3062

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    A high alkali domain spreads out due to the use of cement materials for the construction of the repository of radioactive wastes. Sudden change of pH at this alkali front produces colloidal silicic acid (polymeric silicic acid) in addition to the deposition of supersaturated monomeric silicic acid onto the fracture surface of flow-pathway. The colloidal silicic acid also deposits with relatively small rate-constant in the co-presence of solid phase. Once the flow-path surface is covered with the amorphous silica, the surface seriously degrades the sorption behavior of radionuclides (RNs). Therefore, so far, the authors have examined the deposition rates of supersaturated silicic acid. This study summarized the deposition rate-constants defined by the first-order reaction equation under various conditions of co-presence of amorphous silica powder. Then, using the smallest rate-constant (1.0×10-12 m/s in the co-presence of calcium ions of 1 mM) and a simulation code, COLFRAC-MRL, the spatial range of colloidal silicic acid deposited downstream from the alkali front was estimated. The results suggested the clogging caused by the deposition of colloidal silicic acid in flow-path. The altered spatial range in the flow-path was limited to around 30 m in fracture and to several centimeters in rock matrix.

  103. Burning of MOX fuels in LWRs; fuel history effects on thermal properties of hull and end piece wastes and the repository performance Peer-reviewed

    Fumio Hirano, Seichi Sato, Tamotsu Kozaki, Yaohiro Inagaki, Tomohiko Iwasaki, Toshiaki Ohe, Kazuyuki Kato, Kazumi Kitayama, Shinya Nagasaki, Yuichi Niibori

    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY 49 (3) 310-319 2012/03

    DOI: 10.1080/00223131.2012.660021  

    ISSN: 0022-3131

    eISSN: 1881-1248

  104. Fractional derivative–based mass and heat transport model for evaluation of the effect of water injection in geothermal reservoirs

    Suzuki Anna, Makita Hiroshi, Niibori Yuichi, Hashida Toshiyuki

    Proceedings of the 13th Korea-Japan Students Symposium 2012

  105. Deposition of calcium-silicate-hydrate gel on rough surface of granite from calcium-rich highly alkaline plume Peer-reviewed

    Yuichi Niibori, Kyo Komatsu, Hitoshi Mimura

    Materials Research Society Symposium Proceedings 1475 349-354 2012

    DOI: 10.1557/opl.2012.598  

    ISSN: 0272-9172

  106. Selective separation of Re(VII) and Tc(VII) by xerogel microcapsules enclosing TOA extractant Peer-reviewed

    Rana Syed Masud, Yan Wu, Hitoshi Mimura, Yuichi Niibori, Takasi Onishi, Sin-ichi Koyama

    ATALANTE 2012 INTERNATIONAL CONFERENCE ON NUCLEAR CHEMISTRY FOR SUSTAINABLE FUEL CYCLES 7 258-267 2012

    DOI: 10.1016/j.proche.2012.10.042  

    ISSN: 1876-6196

  107. Selective separation and recovery of cesium by ammonium tungstophosphate-alginate microcapsules Peer-reviewed

    Hitoshi Mimura, Yan Wu, Wang Yufei, Yuichi Niibori, Isao Yamagishi, Masaki Ozawa, Takashi Ohnishi, Shinichi Koyama

    NUCLEAR ENGINEERING AND DESIGN 241 (12) 4750-4757 2011/12

    DOI: 10.1016/j.nucengdes.2011.03.031  

    ISSN: 0029-5493

  108. Identification of Eu(III) Sorption into CSH Gel by the Changes of Fluorescence Emission Spectrum and BET Surface Area Peer-reviewed

    Yuichi Niibori, Keisuke Shirai, Hiroaki Yoshikawa, Hitoshi Mimura

    Proceedings of WM2011 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management), February 27 - March 3, 2011, Phoenix, USA CD-ROM (Paper No. 11192) 1-8 2011/02

  109. Deposition Rates of Polymeric Silicic Acid onto the Surface of Silicate Minerals in the Co-presence of Ca Ions Peer-reviewed

    Naoyuki Tamura, Yuichi Niibori, Hitoshi Mimura

    Proceedings of WM2011 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management), February 27 - March 3, 2011, Phoenix, USA CD-ROM (Paper No. 11378) 1-9 2011/02

  110. SELECTIVE SEPARATION AND RECOVERY OF CESIUM BY AMMONIUM TUNGSTOPHOSPHATE-ALGINATE MICROCAPSULES Peer-reviewed

    Hitoshi Mimura, Yan Wu, Wang Yufei, Yuichi Niibori, Isao Yamagishi, Masaki Ozawa, Takashi Ohnishi, Shinichi Koyama

    PROCEEDINGS OF THE 18TH INTERNATIONAL CONFERENCE ON NUCLEAR ENGINEERING 2010, VOL 1 CD-ROM (Paper No. ICONE18-29091) 419-+ 2011

    DOI: 10.1115/ICONE18-29091  

  111. Sorption Behavior of Iodine on Calcium Silicate Hydrates Formed as a Secondary Mineral Peer-reviewed

    Keisuke Shirai, Yuichi Niibori, Akira Kirishima, Hitoshi Mimura

    PROCEEDINGS OF THE 13TH INTERNATIONAL CONFERENCE ON ENVIRONMENTAL REMEDIATION AND RADIOACTIVE WASTE MANAGEMENT, 2010, VOL 2 CD-ROM (Paper No. ICEM2010-40089) 237-242 2011

  112. Selective Uptake of Palladium from High-Level Liquid Wastes by Hybrid Microcapsules Enclosed with Insoluble Ferrocyanides Peer-reviewed

    Hitoshi Mimura, Takashi Sakakibara, Wu Yan, Yuichi Niibori, Shin-ichi Koyama, Takashi Ohnishi

    PROCEEDINGS OF THE 13TH INTERNATIONAL CONFERENCE ON ENVIRONMENTAL REMEDIATION AND RADIOACTIVE WASTE MANAGEMENT, 2010, VOL 2 CD-ROM (Paper No. ICEM2010-40103) 265-272 2011

    DOI: 10.1115/ICEM2010-40103  

  113. SELECTIVE SEPARATION AND RECOVERY OF CESIUM BY AMMONIUM TUNGSTOPHOSPHATE-ALGINATE MICROCAPSULES Peer-reviewed

    Hitoshi Mimura, Yan Wu, Wang Yufei, Yuichi Niibori, Isao Yamagishi, Masaki Ozawa, Takashi Ohnishi, Shinichi Koyama

    PROCEEDINGS OF THE 18TH INTERNATIONAL CONFERENCE ON NUCLEAR ENGINEERING 2010, VOL 1 (241) 419-+ 2011

    DOI: 10.1016/j.nucengdes.2011.03.031  

  114. Uncertainty of relative permeability to describe Two-Phase flow in geological disposal system Peer-reviewed

    Yuichi Niibori, A. H.N. Joonhong, Hitosht Mimura

    Nuclear Technology 175 (3) 641-651 2011

    Publisher: American Nuclear Society

    DOI: 10.13182/NT11-A12512  

    ISSN: 0029-5450

  115. Characterizing Non-Fickian Transport in Fractured Rock Masses Using Fractional Derivative-Based Mathematical Model Peer-reviewed

    Anna Suzuki, Ryuichi Chiba, Takashi Okaze, Yuichi Niibori, Sergei Fomin, Vladimir Chugnov, Toshiyuki Hashida

    Geothermal Resources Council Transactions 34 1179-1184 2010/10/24

  116. Adsorption Properties of Technetium and Rhenium for Hybrid Microcapsules Enclosing TOA Extractant Peer-reviewed

    Yan Wu, Hitoshi Mimura, Yuichi Niibori, Shinichi Koyama, Takashi Ohnishi

    Proceedings of 17th Pacific Basin Nuclear Conference (17PBNC) CD-ROM 1-13 2010/10

  117. Selective Separation of Re(VII) by Hybrid Microcapsules Enclosing Amines Peer-reviewed

    Hitoshi Mimura, Yan Wu, Yuichi Niibori

    Journal of Ion Exchange 21 (3) 344-349 2010/07

  118. Adsorption Properties of Nuclear Rare Metals for Hybrid Microcapsules Enclosing MIDOA Extractant Peer-reviewed

    Toshiaki Sugimori, Yan Wu, Hitoshi Mimura, Yuichi Niibori

    Journal of Ion Exchange 21 (3) 350-355 2010/07

  119. Sorption Behavior of Eu(III) Into Calcium Silicate Hydrate (CSH) Gel With Relatively Low Ca/Si Ratio <1.0 Peer-reviewed

    Masayuki Narita, Yuichi Niibori, Hitoshi Mimura, Akira Kirishima, Joonhong Ahn

    Proceedings of WM2010 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management), March7-11, 2010, Phoenix, USA (Paper No.10096) 1-9 2010/03/08

  120. Dynamic behavior of silicic acid in the co-presence of the solid phase and Ca ions Peer-reviewed

    Naoyuki Tamura, Yuichi Niibori, Kazuki Iijima, Hitoshi Mimura

    Proceedings of WM2010 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management), March7-11, 2010, Phoenix, USA (Paper No. 10179) 1-11 2010/03/08

  121. Selective separation and recovery of Mo(VI) by hybrid microcapsules containing organic extractant Peer-reviewed

    Kaoru Ikeda, Yan Wu, Hitoshi Mimura, Yuichi Niibori, Yoshito Wakui, Masahiko Osaka, Shinichi Koyama, Takashi Ohnis

    Proceedings of WM2010 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management), March7-11, 2010, Phoenix, USA (Paper No. 10179) 1-11 2010/03/08

  122. Evaluation of Solute Transport through a Fracture by Considering the Spatial Distributions of Retardation Effect in Grain Scale Peer-reviewed

    Yuichi Niibori, Ryohei Nakata, Osamu Tochiyama, Hitoshi Mimura

    JOURNAL OF HYDROLOGIC ENGINEERING 14 (11) 1214-1220 2009/11

    DOI: 10.1061/(ASCE)1084-0699(2009)14:11(1214)  

    ISSN: 1084-0699

  123. Developnebt of Simulator for Geothermal Heat Pump System Considering Groundwater Flow Peer-reviewed

    Hirokazu MORIYA, Takahiro YAMADA, Yuichi NIIBORI, Hiroshi ASANUMA, Hiroaki NIITSUMA

    J. Geotherm, Res. Soc. Japan 31 (4) 203-212 2009/10/01

    DOI: 10.11367/grsj.31.203  

  124. Selective Separation of Heat-Generation Nuclide by Silica gels Loading with Ammonium Molybdophosphate - Adv.-ORIENT Cycle Development Peer-reviewed

    Yusuke Endo, Yan Wu, Hitoshi Mimura, Yuichi Niibori, Shinichi Koyama, Takashi Ohnishi, Hiroshi Obayashi, Isao Yamagishi, Masaki Ozawa

    Proceedings of GlOBAL 2009 1007-1015 2009/09/06

  125. Selective uptake of plutonium (IV) on calcium alginate gel polymer and TBP microcapsule Peer-reviewed

    Yan Wu, Hitoshi Mimura, Yuichi Niibori

    JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY 281 (3) 513-520 2009/09

    DOI: 10.1007/s10967-009-0022-x  

    ISSN: 0236-5731

  126. LWR High Burn-Up Operation and MOX Introduction; Fuel Cycle Performance from the Viewpoint of Waste Management Peer-reviewed

    Yaohiro Inagaki, Tomohiko Iwasaki, Seichi Sato, Toshiaki Ohe, Kazuyuki Kato, Seishi Torikai, Yuichi Niibori, Shinya Nagasaki, Kazumi Kitayama

    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY 46 (7) 677-689 2009/07

    DOI: 10.1080/18811248.2007.9711575  

    ISSN: 0022-3131

    eISSN: 1881-1248

  127. Thermal Impact on Geological Disposal of Hull and End Piece Wastes Resulting from High-Burn-up Operation of LWR and Introduction of MOX Fuels into LWR Peer-reviewed

    Fumio Hirano, Seichi Sato, Tamotsu Kozaki, Yaohiro Inagaki, Tomohiko Iwasaki, Toshiaki Ohe, Kazuyuki Kato, Kazumi Kitayama, Seishi Torikai, Yuichi Niibori, Shinya Nagasaki

    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY 46 (5) 443-452 2009/05

    DOI: 10.1080/18811248.2007.9711551  

    ISSN: 0022-3131

    eISSN: 1881-1248

  128. Adsorption and Elution Behavior of Cesium and Rubidium on Ammonium Tungstophosphate (AWP)-CaALG Alginate Microcapsules Peer-reviewed

    Yan Wu, Chuanpin Lee, Hitoshi Mimura, Yuichi Niibori, Isao Yamagishi, Shinichi Koyama, Masaki Ozawa

    Proceedings of HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management 2009 (CD-ROM) 1-8 2009/03/01

  129. 3D Random Walk Simulation of Migration Behavior of Radionuclide in a Granite Core Peer-reviewed

    Yoshimi Seida, Hiroyasu Takase, Hiroaki Takahashi, Yuichi Niibori

    SCIENTIFIC BASIS FOR NUCLEAR WASTE MANAGEMENT XXXII 1124 543-548 2009

    ISSN: 0272-9172

  130. Dependence of the Dynamic Behavior of Supersaturated Silicic Acid on the Surface Area of the Solid Phase Peer-reviewed

    Yuichi Niibori, Yasunori Kasuga, Hiroshi Kokubun, Kazuki Iijima, Hitoshi Mimura

    SCIENTIFIC BASIS FOR NUCLEAR WASTE MANAGEMENT XXXII 1124 319-324 2009

    ISSN: 0272-9172

  131. Preparation of Ferrocyanide Molybdate and Their Selective Uptake Properties for Palladium and Cesium Ions Peer-reviewed

    Ayumi ASAKURA, Yusuke ENDO, Yan WU, Kaoru IKEDA, Hitoshi MIMURA, Yuichi NIIBORI, Shin-ichi KOYAMA, Masaki OZAWA

    Proceedings of 16th Pacific Basin Nuclear Conference (16PBNC) P16P1056, 1-6 2008/10/13

  132. Selective Uptake of Re(VII) by Amine Microcapsules Peer-reviewed

    Yan WU, Hitoshi MIMURA, Yuichi NIIBORI

    Proceedings of 16th Pacific Basin Nuclear Conference (16PBNC) P16P1071, 1-6 2008/10/13

  133. Selective Uptake of Manganese in Seawater by Hybrid Microcapsules Peer-reviewed

    Takenori KUZUMAKI, Wu YAN, Hitoshi MIMURA, Yuichi NIIBORI

    Proceedings of 16th Pacific Basin Nuclear Conference (16PBNC) P16P1076, 1-6 2008/10/13

  134. Deposition Rates of Colloidal Silicic Acid onto the Surface of Silicate Mineral Peer-reviewed

    Hiroshi Kokubun, Yuichi Niibori, Kazuki Iijima, Hitoshi Mimura

    Proceedings of 16th Pacific Basin Nuclear Conference (16PBNC) P16P1154, 1-6 2008/10/13

  135. Permeability Change with Dissolution and Precipitation Reaction induced by Highly Alkaline Plume in Packed Bed with Amorphous Silica Particles Peer-reviewed

    Kyo Komatsu, Hideo Usui, Junichi Kadowaki, Yuichi Niibori, Hitoshi Mimura

    Proceedings of 16th Pacific Basin Nuclear Conference (16PBNC) P16P1167, 1-6 2008/10/13

  136. The educational activities of atomic partnership in Tohoku University since 2005 Peer-reviewed

    Mitsuhiro Fujiwara, Tadao Mogami, Yuichi Niibori, Akira Hasegawa, Hiromichi Yamazaki, Keizo Ishii

    Proceedings of 16th Pacific Basin Nuclear Conference (16PBNC) P16P1377, 1-5 2008/10/13

  137. Evaluation of Radionuclide Transport in Rock Matrix with Heterogeneous Distribution of Retardation Coefficient Peer-reviewed

    Yuichi NIIBORI, Hirofumi FUTAMATA, Hitoshi MIMURA

    Proceedings of 16th Pacific Basin Nuclear Conference (16PBNC) P16P1074, 1-6 2008/10/12

  138. Sorption Behavior of Europium on Calcium Silicate Hydrates Peer-reviewed

    Yuichi NIIBORI, Masayuki NARITA, Junichi KADOWAKI, Hiroaki YOSHIKAWA, Akira KIRISHIMA, Hitoshi MIMURA

    Proceedings of 16th Pacific Basin Nuclear Conference (16PBNC) P16P1075, 1-6 2008/10/12

  139. Numerical Simulations of the Anomalous Solute Transport in a Fractured Porous Aquifer Peer-reviewed

    Ryuichi Chiba, Takashi Okaze, Sergei Fomin, Vladimir Chugunov, Yuichi Niibori, Hisao Fukunaga, Toshiyuki Hashida

    GRC (Geothermal Resources Council) Transactions 32 441-443 2008/10

  140. Selective separation of nuclides by hybrid microcapsules: (1) Separation of heat-generating nuclides (Cs,Sr) Peer-reviewed

    Y.Endo, T.Tachibana, W.Yan, L.Chuanpin, H.Mimura, Y.Niibori, M.Ozawa, S.Koyama, M.Kamiya

    Proceedings of 10th OECD NEA Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation 1-10 2008/10

  141. Selective separation of nuclides by hybrid microcapsules: (2) Separation of rear metals (Re,Mo) Peer-reviewed

    W.Yan, K.Ikeda, L.Chuanpin, H.Mimura, Y.Niibori, M.Osaka, S.Koyama, Y.Wakui

    Proceedings of 10th OECD NEA Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation 1-10 2008/10

  142. Uptake of Strontium (II) in Concentrated Nitric Acid by Microcapsules Enclosed with Decyl-18-Crown-6 Peer-reviewed

    Takahiro TACHIBANA, Yan WU, Chuan-Pin LEE, Hitoshi MIMURA, Yuichi NIIBORI, Yoshito WAKUI, Masayoshi KAMIYA

    Proceedings of 16th Pacific Basin Nuclear Conference (16PBNC) P16P1073, 1-6 2008/10

  143. Comparison of the batch and breakthrough properties of stable and plain alginate microcapsules with a chelating resin and an ion exchanger in Ag+ adsorption Peer-reviewed

    Mohammad Outokesh, Yuichi Niibori, Hitoshi Mimura, Seyed Javad Ahmadi

    INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 47 (17) 6742-6752 2008/09

    DOI: 10.1021/ie071200n  

    ISSN: 0888-5885

  144. Numerical simulation of supercritical CO2 injection into subsurface rock masses Peer-reviewed

    Kenta Sasaki, Takashi Fujii, Yuichi Niibori, Takatoshi Ito, Toshiyuki Hashida

    ENERGY CONVERSION AND MANAGEMENT 49 (1) 54-61 2008/01

    DOI: 10.1016/j.enconman.2007.05.015  

    ISSN: 0196-8904

  145. Selective uptake properties of metal ions by hybrid microcapsules enclosed with TBP Peer-reviewed

    Y. Wu, M. Outokesh, H. Mimura, Y. Niibori

    PROGRESS IN NUCLEAR ENERGY 50 (2-6) 487-493 2008

    DOI: 10.1016/j.pnucene.2007.11.062  

    ISSN: 0149-1970

  146. Deposition rates of polysilicic acid with up to 10(-3) M calcium ions Peer-reviewed

    Taiji Chida, Yulchi Niibori, Osamu Tochiyama, Hitoshi Mimura, Koichi Tanaka

    APPLIED GEOCHEMISTRY 22 (12) 2810-2816 2007/12

    DOI: 10.1016/j.apgeochem.2007.06.018  

    ISSN: 0883-2927

  147. Uptake Properties of Radioactive Nuclides on Microcapsules Encapsulatng DEHPA Extractant Peer-reviewed

    Yan Wu, Hitoshi Mimura, Yuichi Niibori

    Journal of Ion Exchange 18 (4) 396-401 2007/10

    DOI: 10.5182/jaie.18.396  

  148. Selective Separation of Strontium(II) in Concentrated Nitric Acid Solution by Hybrid Microcapsules Enclosing Crown Ether(D18C6) Compounds Peer-reviewed

    Takahiro Tachibana, Yan Wu, Hitoshi Mimura, Yuichi Niibori, Yoshito Wakui, Masayoshi Kamiya

    J. ION EXCHANGE 18 (4) 384-389 2007/10

    DOI: 10.5182/jaie.18.384  

  149. Selective Uptake of Cesium Ions on AMP-loaded Silica Gels. Peer-reviewed

    Yusuke ENDO, Yan WU, Hitoshi MIMURA, Yuichi NIIBORI, M. Ozawa

    J. Ion Exchange 18 (4) 444-449 2007/10

    DOI: 10.5182/jaie.18.444  

  150. Simplified analytical shrinking core breakthrough model for the design of a packed column of lewatite TP 214 chelating resin Peer-reviewed

    Mohammad Outokesh, Hitoshi Mimura, Houshyar Noshad, Yuichi Niibori

    INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 46 (16) 5412-5419 2007/08

    DOI: 10.1021/ie061177q  

    ISSN: 0888-5885

  151. Renewable Geo-energy Development at Practical Srage Invited Peer-reviewed

    Takatoshi ITO, Yuichi NIIBORI

    Journal of the Heat Transfer Society of Japan 46 (196) 28-37 2007/07

  152. Numerical Solutions of the Anomalous Contaminant Transport in a Heterogeneous Aquifer Peer-reviewed

    Ryuichi Chiba, Sergei Fomin, Vladimir Chugunov, Yuichi Niibori, Toshiyuki Hashida

    Proc. of 1st Int. Sympo. on Aqua Science, Water Resource and Innovation Development of Countryside, (Sakawa, Kochi, Japan, November 26-30, 2007) 349-352 2007

  153. Numerical simulation of injection for CO2 geological sequestration with a treatment of CO2 dissolution into water Peer-reviewed

    K. Sasaki, T. Fujii, Y. Niibori, T. Ito, T. Hashida

    WATER DYNAMICS 898 45-+ 2007

    DOI: 10.1063/1.2721247  

    ISSN: 0094-243X

  154. Numerical simulation of non-fickian diffusion and advection in a fractured porous aquifer Peer-reviewed

    R. Chiba, S. Fomin, V. Chugunov, Y. Niibori, T. Hashida

    WATER DYNAMICS 898 75-+ 2007

    DOI: 10.1063/1.2721253  

    ISSN: 0094-243X

  155. Numerical model of fluid flow through heterogeneous rock for high level radioactive waste disposal Peer-reviewed

    M. Shirai, R. Chiba, S. Fomin, V. Chugunov, T. Takahashi, Y. Niibori, T. Hashida

    WATER DYNAMICS 898 57-+ 2007

    DOI: 10.1063/1.2721249  

    ISSN: 0094-243X

  156. Permeability change of crystalline silicate mineral-packed bed column by highly alkaline plume Peer-reviewed

    Hideo Usui, Yuichi Niibori, Osamu Tochiyama, Hitoshi Mimura

    SCIENTIFIC BASIS FOR NUCLEAR WASTE MANAGEMENT XXX 985 581-+ 2007

    ISSN: 0272-9172

  157. Chemical interaction between amorphous silica mineral and highly alkaline plume with Ca ion Peer-reviewed

    H. Usui, Y.Niibori, J. Kadowaki, K. Tanaka, O. Tochiyama, H. Mimura

    Proceedings of 15th Pacific Basin Nuclear Conference (CD-ROM) Paper No.24 1-6 2006/10

  158. Preparation of Biopolymer Microcapsules and Their Uptake properties for the Heavy Ions Peer-reviewed

    Mohammad OUTOKESH, Hitoshi MIMURA, Yuichi NIIBORI, Kouichi TANAKA

    Japan Association of Ion Exchange 17 (2) 67-74 2006/10

    DOI: 10.5182/jaie.17.67  

  159. Preparation of stable alginate microcapsules coated with chitosan or polyethyleneimine for extraction of heavy metal ions Peer-reviewed

    M Outokesh, H Mimura, Y Niibori, K Tanaka

    JOURNAL OF MICROENCAPSULATION 23 (3) 291-301 2006/05

    DOI: 10.1080/02652040500435188  

    ISSN: 0265-2048

  160. Equilibrium and kinetics of silver uptake by multinuclear alginate microcapsules comprising an ion exchanger matrix and Cyanex 302 organophosphinic acid extractant Peer-reviewed

    M Outokesh, H Mimura, Y Niibori, K Tanaka

    INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 45 (10) 3633-3643 2006/05

    DOI: 10.1021/ie051109o  

    ISSN: 0888-5885

  161. Preliminary study on selective separation of soft metal ions from HLLW by using alginate microcapsules enclosing Cyanex 302 extractant

    Mohammad Otokesh, Yan Wu, Hitoshi Mimura, Yuichi Niibori, Kouichi Tanaka

    The 15th Pacific Basin Nuclear Conference (PBNC 2006) 2006

  162. Effects of calcium ion in highly alkaline plume on permeability change of flow-path Peer-reviewed

    Hideo Usui, Yuichi Niibori, Koichi Tanaka, Osamu Tochiyama, Hitoshi Mimura

    SCIENTIFIC BASIS FOR NUCLEAR WASTE MANAGEMENT XXIX 932 167-+ 2006

    ISSN: 0272-9172

  163. An experimental approach on the effect of rock alteration on sorption behavior Peer-reviewed

    Yuichi Niibori, Yasunori Kasuga, Hiroaki Yoshikawa, Kouichi Tanaka, Osamu Tochiyama, Hiroshi Mimura

    SCIENTIFIC BASIS FOR NUCLEAR WASTE MANAGEMENT XXIX 932 951-+ 2006

    ISSN: 0272-9172

  164. Numerical simulation for non-Fickian diffusion into fractured porous rock Peer-reviewed

    Ryuichi Chiba, Sergei Fomin, Vladimir Chugunov, Toru Takahashi, Yuichi Niibori, Toshiyuki Hashida

    WATER DYNAMICS 833 133-+ 2006

    DOI: 10.1063/1.2207091  

    ISSN: 0094-243X

  165. Key Issues in Nuclear Fuel Cycle Concerning High Burn-up Strategy Peer-reviewed

    Seichi SATO, Yaohiro INAGAKI, Tomohiko IWASAKI, Toshiaki OHE, Kazuyuki KATO, Seishi TORIKAI, Yuichi NIIBORI

    Proceedings of GLOBAL 2005 Paper No.547, 1-6 2005/10/09

  166. Selective Uptake of Palladium by Biopolymer Microcapsules Enclosing Insoluble Ferrocyanides Peer-reviewed

    Takashi SAKAKIBARA, Hitoshi MIMURA, Yuichi NIIBORI, Kouichi TANAKA

    Proceedings of GLOBAL2005 Paper No.090, 1-6 2005/10/09

  167. Permeability Change of Packed Bed with an Amorphous Silicate Mineral by Highly Alkaline Plume Peer-reviewed

    Hideo USUI, Yuichi NIIBORI, Koichi TANAKA, Osamu TOCHIYAMA, Hitoshi MIMURA

    Proceedings of GLOBAL 2005 Paper No.095, 1-6 2005/10/09

  168. The Influence of Calcium Ion on Dynamic Behavior of Colloidal-Silicic Acid in the Presence of Solid Phase Peer-reviewed

    Taiji CHIDA, Yuichi NIIBORI, Osamu Tochiyama, Hitoshi MIMURA, Koichi TANAKA

    Proceedings of GLOBAL 2005 Paper No.154, 1-6 2005/10/09

  169. Dissolution Behavior of Amorphous Silica Altered in Highly Alkaline Solution Peer-reviewed

    Taiji CHIDA, Yuichi NIIBORI, Osamu Tochiyama, Hitoshi MIMURA, Koichi TANAKA

    Proceedings of GLOBAL 2005 Paper No. 244, 1-6 2005/10/09

  170. Selective Removal of Ag+ Ions from Nitric Acid Medium by Alginate Microcapsules, Lewatite TP 214 Chelating Resin, and 200 CT Strongly Acidic Ion Exchanger Peer-reviewed

    Mohammad OUTOKESH, Hitoshi MIMURA, Yuichi NIIBORI, Kouichi TANAKA

    Proceedings of GLOBAL 2005 Paper No.410, 1-6 2005/10/09

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    2005-10-9 to 2005-10-13

  171. Preface for a Lecture Note on Geothermal Heat Pump Systme Invited

    Yuichi NIIBORI

    J. Geotherm. Res. Soc. Japan 27 (4) 259-262 2005/10/01

    Publisher:

    DOI: 10.11367/grsj1979.27.259  

    ISSN: 0388-6735

  172. Influence of Colloidal Silicic Acid on the Sorption behavior on Europium Invited

    Yuichi NIIBORI

    Extend Abstracts of “Interface Mineralogy 05”, edited by A.Putnis and K.Tsukamoto 58-59 2005/09/28

  173. Preparation of stable alginate microcapsules with different coatings for extraction of heavy metal ions. Peer-reviewed

    Mohammad Outokesh, Hitoshi Mimura, Yuichi Niibori, Kouichi Tanaka

    Proc. of International Solvent Extraction Conference 2005 CD-ROM 1530-1535 2005/09/20

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    2005-09-19 to 2005-09-23

  174. Uptake of silver by new developed stable alginate microcapsules enclosing CYANEX 302 Invited Peer-reviewed

    Hitoshi Mimura, Mohammad Outokesh, Yuichi Niibori, Kouichi Tanaka

    Proc. of International Solvent Extraction Conference 2005 1536-1542 2005/09/20

  175. A fundamental study of microbial attachment and transportin porous media for the design of MEOR Peer-reviewed

    Yan-Guo Yang, Yuichi Niibori, Chihiro Inoue, Tadashi Chida

    JOURNAL OF THE JAPANESE ASSOCIATION FOR PETROLEUM TECHNOLOGY 70 (5) 459-468 2005/09

    Publisher: The Japanese Association for Petroleum Technology

    DOI: 10.3720/japt.70.459  

    ISSN: 0370-9868

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    Generally, the cell number of the microbes attaching to the solid phase is large rather than that of microbes floating in the pores. For more reliable MEOR (Microbial Enhanced Oil Recovery), such attachment microbes should be distributed efficiently in the target zone of reservoir. In order to understand the attachment behavior of microbes in the flow system of porous media, in this study the relation of the attachment amount and the fluid flow velocity has been examined using a vertical, two-dimensional packed bed (plate-type packed bed).<br>Lactobacillus casei (IFO 15883) was used as the test microbe in this study. The microbe exhibits no motility or chemotaxis and does not produce gas. In the experiments, the growth rate of the microbe was negligible small by controlling the nutrients. The concentration of the cell suspension out of the bed was traced by the turbidity of the suspension. Then, the change of the concentration was analyzed by two-dimensional, advection-dispersion model with the attachment/detachment rate of microbes.<br>For the experimental results, this study evaluated Wout/Win as the cell recovery, where Wout is the cell number flowed out of the packed bed, and Win is the total cell number inputted into the packed bed. Also the maximum attachment amount based on the Langmuir type equation was estimated through the analysis by the two-dimensional mathematical model. The cell recovery and the maximum attachment amount strongly depended on both the injection concentration of the cell suspension, cbin, and the injection flow velocity into the packed bed, vin. The experimental results showed an optimal value of the ratio of cbin to vin, for both the maximum attachment amount and the cell recovery. The optimal value does not always agree with that obtained from one-dimensional packed bed.

  176. Geophysical Impacts of Alkaline Groundwater : Rock Alteration Induced Variations in Permeability Invited

    Yuichi NIIBORI, Hideo USUI, Kouichi TANAKA, Osamu TOCHIYAMA, Hitoshi MIMURA

    Proceedings of the International Symposium NUCEF 2005 JAERI-Conf 2005-007 111-116 2005/08

  177. Design of the BHP System Considering the Heat Transport of Groundwater Flow Peer-reviewed

    Yuichi Niibori, Yoshimi Iwata, Shigehiro Ichinose, Genzaburou Fukaya

    Proceedings of World Geothermal Congress 2005 (CD-ROM) Paper No. 1422 1-6 2005/04

  178. The Role of Geothermal Energy in the Locally Distributed Renewable Energy Sytem (EIMY: Energy In My Yard) Peer-reviewed

    H. Asanuma, H. Niitsuma, T. Nakata, Y. Niibori, H. Moriya, Y. Komaniwa

    Proceedings of World Geothermal Congress 2005 (CD-ROM) Paper No. 1504 1-3 2005/04

  179. Selective Uptake of Palladium by Insoluble Ferrocyanides Peer-reviewed

    Hitoshi Mimura, Takashi SAKAKIBARA, Yuichi NIIBORI, Kouichi TANAKA

    Japan Association of Ion Exchange 16 (1) 29-33 2005/01

    Publisher:

    DOI: 10.5182/jaie.16.29  

    ISSN: 0915-860X

  180. In Situ Experiments of Geothermal Heat Pump System Considering: Groundwater Flow Peer-reviewed

    Yoshimi Iwata, Toshifumi Kobayashi, Genzaburou Fukaya, Keiichi Yokohara, Yuichi Niibori

    Journal of the Geothermal Research Society of Japan 27 (4) 307-320 2005

    DOI: 10.11367/grsj1979.27.307  

    ISSN: 1883-5775 0388-6735

  181. Alkali Hydrothermal Synthesis of K-H Zeolites from Coal Fly Ash and Their Uptake Properties of Heavy Metal Ions Peer-reviewed

    Hitoshi, Mimura, Takaaki Sakai, Yuichi Niibori, Kouichi Tanaka

    Proc. of The Cairo 9th International Conference on Energy & Environment EE9 2004/03

  182. Understanding the influence of spatially varying retardation effect on the solute transport Peer-reviewed

    Y Niibori, S Shimoda, K Tanaka, O Tochiyama

    SCIENTIFIC BASIS FOR NUCLEAR WASTE MANAGEMENT XXVII 807 645-650 2004

    ISSN: 0272-9172

  183. Dissolution rate of colloidal silica in highly alkaline solution Peer-reviewed

    T Chida, Y Niibori, O Tochiyama, H Mimura, K Tanaka

    SCIENTIFIC BASIS FOR NUCLEAR WASTE MANAGEMENT XXVIII 824 467-472 2004

    ISSN: 0272-9172

  184. Fundamental experiments on permeability change of flow-path by highly alkaline plume Peer-reviewed

    H Usui, Y Niibori, K Tanaka, O Tochiyama, H Mimura

    SCIENTIFIC BASIS FOR NUCLEAR WASTE MANAGEMENT XXVIII 824 449-454 2004

    ISSN: 0272-9172

  185. Preparation of biopolymer microcapsules and their uptake properties for Cd2+ ions Peer-reviewed

    H Mimura, M Outokesh, Y Niibori, K Tanaka

    WASTE MANAGEMENT IN JAPAN 99-108 2004

  186. Modeling of the complex formation of metal ions with humic acids Peer-reviewed

    O Tochiyama, Y Niibori, K Tanaka, T Kubota, H Yoshino, A Kirishima, B Setiawan

    RADIOCHIMICA ACTA 92 (9-11) 559-565 2004

    DOI: 10.1524/ract.92.9.559.54996  

    ISSN: 0033-8230

  187. 放射性廃棄物の発生予測と準備状況, 問題点 Invited

    Yuichi NIIBORI

    (社)日本原子力学会再処理・リサイクル部会 第3回再処理リサイクルセミナーテキスト 56-80 2003/10

  188. 地下水の熱移動を考慮した地中熱利用ヒートポンプの設計とその実践 Invited

    Yuichi NIIBORI

    日本学術会議主催 水循環シンポジウム -21世紀の研究課題と展望 講演論文集 25-28」 2003/08

  189. Redox speciation method for neptunium in a wide range of concentrations Peer-reviewed

    A Kirishima, O Tochiyama, K Tanaka, Y Niibori, T Mitsugashira

    RADIOCHIMICA ACTA 91 (4) 191-196 2003

    DOI: 10.1524/ract.91.4.191.19969  

    ISSN: 0033-8230

  190. Dynamic behavior of colloidal silica in the presence of solid phase Peer-reviewed

    T Chida, Y Niibori, O Tochiyama, K Tanaka

    SCIENTIFIC BASIS FOR NUCLEAR WASTE MANAGEMENT XXVI 757 497-502 2003

    ISSN: 0272-9172

  191. Complex Formation of Fe(II) wtih Humic Acid and Polyacrylic Acid Peer-reviewed

    Budi Setiawan, Kouichi Tanaka, Yuichi Niibori, Osamu Tochiyama

    J. Nuclear Fuel Cycle and Environment 9 (1) 21-28 2002/09

    Publisher: Division of Nuclear Fuel Cycle and Environment, Atomic Energy Society of Japan

    DOI: 10.3327/jnuce.9.21  

    ISSN: 1884-7579

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    Humic substances in groundwater are expected to affect the migration behavior of radionuclides by forming soluble colloid complexes with radionuclides. In order to understand the interaction between radionuclides and humic substances, it is also important to estimate the effect of the competing cations originally present in the groundwater. In this connection, the complex formation of Fe(II) with Aldrich humic acid has been investigated by ion exchange method. To evaluate the effect of heterogeneous composition and of polyelectrolyte nature of humic acid, the complex formation of Fe(II) with homogeneous polymeric weak acid, polyacrylic acid (MW = 90000 Dalton) has been also examined to compare the effect of pH, ionic strength and metal-ion concentration on the complex formation. By defining the apparent formation constant as βα = [ML]/([M][R]), where [M] and [ML] are the concentrations of free and bound Fe2+ ion, and [R] = CRα (CR is the total concentration of proton exchange sites and α is the degree of dissociation of humic or polyacrylic acid), the values of logβα have been obtained at pcH 4.6 to 5.5 in 0.1 and 1.0 M NaCl at the concentration of Fe(II) from ~10-8 to ~10-4 M. For both humate and polyacrylate complexes, logβα increased with the degree of dissociation and decreased with ionic strength (at I = 0.1 M NaCl, from 2.26 (α = 0.32) to 2.59 (α = 0.47) for Fe(II)-polyacrylate and from 4.66 (α = 0.58) to 4.83 (α = 0.70) for Fe(II)-humate, and at I = 1.0 M NaCl, from 0.53 (α = 0.49) to 0.98 (α = 0.71) for Fe(II)-polyacrylate and from 3.31 (α = 0.59) to 3.62 (α = 0.71) for Fe(II)-humate). The dependence of logβα of humate on logα was similar to that of polyacrylate and that of humate on ionic strength was slightly less than that of polyacrylate. While the variation of Fe(II) concentration had no appreciable influence on logβα of Fe(II)-polyacrylate, logβα of Fe(II)-humate appreciably increased at lower Fe(II) concentrations due to the heterogeneous composition of the humic acid (at I = 0.1 M NaCl, α = 0.68, from 3.21 (CFe = 4×10−4 M) to 4.79 (CFe = 6×10−8 M) and at I = 1.0 M NaCl, α = 0.68, from 2.35 (CFe = 4×10−4 M) to 3.58 (CFe = 6×10−8 M)).

  192. 固体-水相互作用の下での金属含水酸化物の沈殿・結晶化の速度機構

    杤山 修, 新堀雄一, 田中紘一, 守屋由介, 油井三和, 柴田雅博, 鐵 剛志

    サイクル機構技術資料(共同研究報告書;東北大学),JNC TY8400 2002-014. 1-119 2002/05

  193. Complex formation of Eu(111) with humic acid and polyacrylic acid Peer-reviewed

    T Kubota, O Tochiyama, K Tanaka, Y Niibori

    RADIOCHIMICA ACTA 90 (9-11) 569-574 2002

    DOI: 10.1524/ract.2002.90.9-11_2002.569  

    ISSN: 0033-8230

  194. Complex formation of calcium with humic acid and polyacrylic acid Peer-reviewed

    A Kirishima, K Tanaka, Y Niibori, O Tochiyama

    RADIOCHIMICA ACTA 90 (9-11) 555-561 2002

    DOI: 10.1524/ract.2002.90.9-11_2002.555  

    ISSN: 0033-8230

  195. A Study on Relation between Groundwater Flow and the Design of Ground-Coupled HP System with Borehole Peer-reviewed

    Yuichi Niibori, Yoshimi Iwata, Fukashi Mori, Genzaburou Fukaya

    Journal of the Geothermal Research Society of Japan 24 (4) 339-348 2002

    DOI: 10.11367/grsj1979.24.339  

    ISSN: 1883-5775 0388-6735

  196. Heterogeneity of the Retardation Effect and Mass Transport in Geological Disposal System of Radioactive Wastes Peer-reviewed

    Yuichi NIIBORI, Osamu TOCHIYAMA, Tadashi CHIDA

    J. Mining and Materials Processing Institute of Japan 117 (10) 822-828 2001/10

    Publisher: The Mining and Materials Processing Institute of Japan

    DOI: 10.2473/shigentosozai.117.822  

    ISSN: 0916-1740

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    The relation between the mass transport rate and the spatial distribution of retardation coefficient, Rd, has been examined by using two-dimensional (2-D), advection-dispersion model. In the calculated breakthrough curves, this study focused on the peak height and its arrival time. To compare them easily, the dimensionless mean residence time was always set at unity. In the results, as the Rd values were distributed perpendicular to the flow direction, the peak height and its arrival time strongly depended on the Rd distribution. This study, for simplicity, considered two kinds of Rd layers and assumed that the small Rd and the large were arranged parallel to one another. The smaller the alternation frequency of the layers became, the higher peak and the shorter arrival-time the breakthrough curve showed. In contrast, when the frequency was large enough, the peak-arrival time almost agreed with the homogeneous case. Further, this study confirmed that the variation of the skewness of Rd had no appreciable influence on the whole mass transport rate. When the 2-D distribution of Rd was described by, e.g., log-normal distribution, the average mass transport rates showed agreement with those on the other probability density functions defined by the same set of the arithmetic mean and the standard deviation of Rd. These tendencies mentioned above were confirmed in the range of Peclet number from 10 to 102 for the dimensionless standard deviation at least up to around 1.

  197. Analysis of Tracer Test and Its Development into Reservoir Model (Geochemistry for Geothermal Development) Invited

    Yuichi NIIBORI

    CHINETSU 38 (3) 250-270 2001/09

    Publisher:

    ISSN: 0385-7034

  198. LCA for ground-source heat pump system with underground fracture

    Yuichi NIIBORI, Tatsuo INOUE, Hiroaki NIITSUMA

    Proc. of the 20th annual meeting of Japan Society of Energy and Resources 20 323-328 2001/06

    ISSN: 0914-112X

  199. 米国における高レベル放射性廃棄物処分についての調査報告

    新堀雄一

    財団法人 原子力安全研究協会 地層処分の安全規制等に係る基本的考え方に関する調査研究 255-266 2001/03

  200. Study on Tracer Responses in Heterogeneous Porous Media: Network Model and Invasion Percolation Approaches Peer-reviewed

    Daisuke HAGA, Yuichi NIIBORI, Tadashi CHIDA

    Proceeding of the JSST 2000 International Conference on Modeling, Control and Computation in Simulation 189-195 2000/10

  201. Investigation of the Growth of Bacteria in Porous Materials Peer-reviewed

    Yan-Gou Yang, Chihiro Inoue, Yuichi Niibori, Tadashi Chida

    Proceedings of the Fifth international Symposium on Environmental Biotechnology(CD-ROM) 683-686 2000/07

  202. TRACER RESPONSES IN GAS-LIQUID, TWO-PHASE FLOW THROUGH POROUS MEDIA Peer-reviewed

    D.Haga, Y.Niibori, T.Chida

    Proc. World Geothermal Congress 2000 (CD-ROM) 2591-2596 2000/05

  203. NUMERICAL STUDY ON HEAT EXTRACTION FROM SUPERCRITICAL GEOTHERMAL RESERVOIR Peer-reviewed

    Kimio Watanabe, Yuichi Niibori, Toshiyuki Hashida

    Proc. World Geothermal Congress 2000 (CD-ROM) 3957-3961 2000/05

  204. Dissolution rates of amorphous silica in highly alkaline solution Peer-reviewed

    Y Niibori, M Kunita, O Tochiyama, T Chida

    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY 37 (4) 349-357 2000/04

    DOI: 10.1080/18811248.2000.9714905  

    ISSN: 0022-3131

    eISSN: 1881-1248

  205. Complex formation of Np(V) with humic acid and polyacrylic acid Peer-reviewed

    O Tochiyama, H Yoshino, T Kubota, M Sato, K Tanaka, Y Niibori, T Mitsugashira

    RADIOCHIMICA ACTA 88 (9-11) 547-552 2000

    DOI: 10.1524/ract.2000.88.9-11.547  

    ISSN: 0033-8230

  206. Complex formation of Eu(III) with polyacrylic acid Peer-reviewed

    T Kubota, O Tochiyana, K Tanaka, Y Niibori

    RADIOCHIMICA ACTA 88 (9-11) 579-582 2000

    DOI: 10.1524/ract.2000.88.9-11.579  

    ISSN: 0033-8230

  207. Modeling of Growth and Transport of Bacteria in Porous Media Peer-reviewed

    Yan-Guo Yang, Yuichi Niibori, Chihiro Inoue, Tadashi Chida

    Proceedings on Applied Modeling and Simulation, IASTED International Conference AMS'99 589-594 1999/09

  208. Numerical models of HDR geothermal reservoirs - a review of current thinking and progress Peer-reviewed

    K Hayashi, J Willis-Richards, RJ Hopkirk, Y Niibori

    GEOTHERMICS 28 (4-5) 507-518 1999/08

    DOI: 10.1016/S0375-6505(99)00026-7  

    ISSN: 0375-6505

  209. Hydrodynamic dispersion and mass transfer in unsaturated flow Peer-reviewed

    D Haga, Y Niibori, T Chida

    WATER RESOURCES RESEARCH 35 (4) 1065-1077 1999/04

    DOI: 10.1029/1998WR900111  

    ISSN: 0043-1397

  210. Hydrodynamic dispersion and mass transfer in unsaturated flow

    D. Haga, Y. Niibori, T. Chida

    Polygraph International (1) 1065-1077 1999

    Publisher: Druckmaschinen Gmbh Leipzig

    ISSN: 0943-0083

  211. Understanding of relationship between the average mass transport rate and the moments of permeability Peer-reviewed

    Y Niibori, O Tochiyama, T Chida

    SCIENTIFIC BASIS FOR NUCLEAR WASTE MANAGEMENT XXII 556 751-758 1999

    ISSN: 0272-9172

  212. Concept and Applicability of Sorption Distribution Coefficient in Radionuclide Transport Model Peer-reviewed

    Osamu Tochiyama, Aki Takasu, Takao Ikeda, Hideo Kimura, Seichi Sato, Shinya Nagasaki, Shinichi Nakayama, Yuichi Niibori, Hirotaka Huruya, Tochiaki Mitsugashira, Tetsuji Yamaguchi

    Journal of Nuclear Fuel Cycle and Environment 5 (1) 3-19 1998/09

    Publisher:

    ISSN: 1343-4446

  213. Laboratory experiments and numerical analyses on nutrients transport for MEOR Peer-reviewed

    Yanguo Yang, Yuichi Niibori, Tadashi Chida

    Journal of the Japanese Association for Petroleum Technology 63 (3) 229-238 1998/03

    Publisher: The Japanese Association for Petroleum Technology

    DOI: 10.3720/japt.63.229  

    ISSN: 0370-9868

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    This study focuses on the efficient spread of nutrients for microbial enhanced oil recovery (MEOR), which in turn controls the growth rates of bacteria. By using a two-dimensional packed-bed with glass-beads, flooding and huff&puff experiments with and without a shut-in process were carried out in order to examine distribution of nutrients. KCl solution was applied to replicate nutrients. The experimental results by the solution injections into the horizontal bed or the vertical one, showed good agreements with the calculations of the two-dimensional mathematical model considering the convection, the mixing diffusion and the buoyancy force due to differences of the solution concentration. Effects of the shut-in period on distribution of nutrients were also investigated by using the mathematical model. The results displayed that the transport of the nutrient and its distribution depended clearly on the starting time of shut-in and the injection concentration of the nutrient.

  214. A study of the interaction of neptunium(V) with polyacrylic acid by solvent extraction Peer-reviewed

    T Kubota, O Tochiyama, H Yoshino, K Tanaka, Y Niibori

    RADIOCHIMICA ACTA 83 (1) 15-20 1998

    ISSN: 0033-8230

  215. A Fundamental Study on the Response Analysis of Liquid Tracer in Gas-Liquid, Two-Phase Steady Flow in Porous Media Peer-reviewed

    Daisuke Haga, Tadashi Chida, Yuichi Niibori

    Journal of the Geothermal Research Society of Japan 20 (4) 263-274 1998

    DOI: 10.11367/grsj1979.20.263  

    ISSN: 1883-5775 0388-6735

  216. Dissolution rates of silica scale and silica gel at the low temperature up to 340K Peer-reviewed

    Yuichi Niibori, Masashi Kunita, Osamu Tochiyama, Tadashi Chida

    Proceedings of the 33rd Conference of Societe Internationale des Techniques Hydrothermales (SITH) 122-125 1997/12

  217. The Formation Rate of Carbon Filaments on Transition Metals from CO-H2 Gas Mixtures Peer-reviewed

    Noboru Yamashita, Yuichi Niibori, Noriyoshi Tsuchiya, Tadashi Chida

    Journal of the Mining and Materials Processing Institute of Japan 113 (3) 199-204 1997/03

    Publisher:

    DOI: 10.2473/shigentosozai.113.199  

    ISSN: 0916-1740

  218. HDR academic review: Modeling/Numerical Analysis Peer-reviewed

    K.Hayashi, J.Willis-Richards, R.J.Hopkirk, Y.Niibori, G.Zyvoloski, B.Robinson, D.Swenson

    Proceedings of STRUCTURED ACADEMIC REVIEW of HDR/HWR C5-1-C5-21 1997/03

  219. Estimation of the radionuclide transport by applying the mean, the standard deviation and the skewness of permeability

    Y. Niibori, O. Tochiyama, T. Chida

    Materials Research Society Symposium - Proceedings 465 917-924 1997

    Publisher: Materials Research Society

    ISSN: 0272-9172

  220. Estimation of the radionuclide transport by applying the mean, the standard deviation and the skewness of permeability Peer-reviewed

    Y Niibori, O Tochiyama, T Chida

    SCIENTIFIC BASIS FOR NUCLEAR WASTE MANAGEMENT XX 465 917-924 1997

    ISSN: 0886-7860

  221. A Study of Effects of Topography and Dip on Groundwater Flow Peer-reviewed

    Yuichi Niibori, Shinichi Hagihara, Tadashi Chida

    Journal of the Geothermal Research Society of Japan 18 (4) 263-271 1996/10

    DOI: 10.11367/grsj1979.18.263  

  222. Estimation of heat discharge rate at the permeable surface of a geothermal reservoir Peer-reviewed

    Yuichi NIIBORI, Tadashi CHIDA

    Proceedings of the World Geothermal Congress, 1995 3 1619-1624 1995/05

  223. IDENTIFICATION OF GEOTHERMAL RESERVOIR STRUCTURE ANALYZING TRACER RESPONSES USING THE 2-FRACTURED-LAYER MODEL Peer-reviewed

    Y NIIBORI, H OGURA, T CHIDA

    GEOTHERMICS 24 (1) 49-60 1995/02

    DOI: 10.1016/0375-6505(94)00021-4  

    ISSN: 0375-6505

  224. Effects of phosphate ions on dissolution rate of calcite Peer-reviewed

    Hiroyuki Kamimura, Yuichi Niibori, Tadashi Chida

    Mining Geology 44 (5) 331-337 1994/10

    Publisher: The Society of Resource Geology

    DOI: 10.11456/shigenchishitsu1992.44.331  

    ISSN: 0918-2454

    More details Close

    Dissolution of calcite at pH5 is investigated over a wide range of phosphate concentration(1.0×10-6-5.0×10-1mole/dm3). The experimental result indicates that the phosphate ions at low concentration(0-10-5mole/dm3) act as an inhibitor on the dissolution rate of calcite, but at high concentration(10-3-10-1mole/dm3), the calcite dissolution rate increases as phosphate ions increasing. From these data, and SEM photomicrographs of the calcite surface under high concentration of phosphate, it was concluded: (1) for low concentration of phosphate ion, its chemical adsorption, which can be described by a Langmuir isotherm equation, to the calcite surface makes the reaction area smaller and the dissolution rate of calcite slower, (2) phosphate ions at the calcite surface act as a buffer of the hydrogen ion concentration and its effect appears as the increment of the calcite dissolution rate.

  225. A Numerical Model of Mass Transfer in Water-Steam Flow through a Porous Medium Peer-reviewed

    Yuichi NIIBORI, Tadashi CHIDA

    Extended Abstracts of Third World Congress on Computational Mechanics 2 1442-1443 1994/08

  226. A Study of Tracer Injection Method into an Aquifer

    M.Gonaikawa, M.Shimada, Y.Niibori, H.Cheng-Xie, T.Chida

    Proc. of 3rd Sympo. on Groundwater/Soil Pollutions and Their Management 3 93-98 1994/06

  227. Tracer Response in a Vertical, Two-dimensional Porous Medium Accompanied by Heat Transfer: Comparison of the Laboratory Experiments with the Numerical Model Peer-reviewed

    Yuichi NIIBORI, Hong Cheng-Xie, Tadashi CHIDA

    Journal of GROUNDWATER HYDROLOGY 36 (2) 123-132 1994/05

    Publisher: Japanese Association of Groundwater Hydrology

    DOI: 10.5917/jagh1987.36.123  

    ISSN: 0913-4182

    More details Close

    This paper describes tracer response in a vertical, two-dimensional, porous medium accompanied by heat transfer. The experiments are carried out using the packed bed (150mm×150mm×12mm) with glass beads, of which average diameter is1 mm or 0.3 mm. The bed is vertically submerged into the thermostat at a temperature of about 340 K. Distilled water with room temperature is injected locally and continuously into the bed under a constant pressure gradient, also is produced out of the outlet. When the temperature in the bed attains to be steady, KC1 solution of 0.1 mol / l is injected as a tracer for several minutes. The concentration is measured every a few minutes by an electrode set at the outlet. The experimental results of the tracer response and the temperature distribution are analyzed by the numerical model already proposed by the authors. The mathematical model is based on mass and heat transfer in a vertical, two-dimensional, permeable medium. This paper indicates that the calculated values of the tracer response and that of the temperature agree well with the experimental results. Some of the results indicated that the tracer response is quite different from that under the isothermal condition.

  228. THE USE OF STANDARD-DEVIATION AND SKEWNESS FOR ESTIMATING APPARENT PERMEABILITY IN 2-DIMENSIONAL, HETEROGENEOUS MEDIUM Peer-reviewed

    Y NIIBORI, T CHIDA

    TRANSPORT IN POROUS MEDIA 15 (1) 1-14 1994/04

    DOI: 10.1007/BF01046155  

    ISSN: 0169-3913

  229. A Model of Local Distribution of Saturation in a Fractured Layer, and Its Application Peer-reviewed

    Yuichi NIIBORI, Tadashi CHIDA

    Proceedings of Stanford Geothermal Reservoir Engineering Workshop 19 91-98 1994/01

  230. Estimation Equations of Relative Permeabilities Considered Saturation Distribution Peer-reviewed

    Yuichi Niibori, Tadashi Chida

    journal of the geothermal research society of japan 16 (4) 455-471 1994

    DOI: 10.11367/grsj1979.16.455  

    ISSN: 1883-5775 0388-6735

  231. Modeling of Mass Transfer in Water-Steam Two-phase Flow through a Porous Medium

    Yuichi NIIBORI, Tadashi CHIDA

    Proc.Conf.on Simulation Technology 12 95-98 1993/06

  232. pH-Control by Self-organizing Fuzzy Control System Peer-reviewed

    Y.Niibori, Y.Kobayashi, T.Chida

    Metallurgical Review of MMIJ 9 (2) 18-34 1992/12

  233. Stochastic Approach on Water-Steam Flow Model in a Geothermal Reservoir

    Y.Niibori, T.Chida

    Proc.Conf.on Simulation Technology 11 27-30 1992/06

  234. pH-control by Self-Organizing Fuzzy Controller System Peer-reviewed

    Y.Kobayashi, Y.Niibori, T.Chida

    Journal of the MMIJ 108 (1) 7-12 1992

    Publisher:

    DOI: 10.2473/shigentosozai.108.7  

    ISSN: 0916-1740

  235. Dissolution Rate of Calcite in Weak Acid Region Peer-reviewed

    T.Shibuya, Y.Niibori, N.Tsuchiya, T.Chida

    Mining Geology 42 (4) 241-247 1992

    Publisher:

    DOI: 10.11456/shigenchishitsu1992.42.241  

    ISSN: 0918-2454

  236. Fundamental Study on Tracer Response Analysis for Water-Steam Flow Accompanied by Boiling in a Porous Medium Peer-reviewed

    Yuichi Niibori, Akira Kounosu, Tadashi Chida

    journal of the geothermal research society of japan 14 (2) 129-144 1992

    DOI: 10.11367/grsj1979.14.129  

    ISSN: 1883-5775 0388-6735

  237. Consideration on correlation equation between average saturaion and relative permeabilities Peer-reviewed

    Yuichi Niibori, Tadashi Chida

    journal of the geothermal research society of japan 14 (4) 323-339 1992

    DOI: 10.11367/grsj1979.14.323  

    ISSN: 1883-5775 0388-6735

  238. A Consideration on Interaction between Sulfur-oxidizing Bacteria and Protozoa - Behaviors of a group of microorganism in a long time enrichment batch culture - Peer-reviewed

    K.Suto, Y.Niibori, A.Kounosu, T.Chida

    Journal of the MMIJ 107 (11) 789-794 1991/11

    DOI: 10.2473/shigentosozai.107.789  

  239. Tracer response analysis through a fractured geothermal reservoir Peer-reviewed

    Hiroaki Ogura, Yuichi Niibori, Tadashi Chida

    Journal of the Geothermal Research Society of Japan 13 (2) 95-105 1991

    DOI: 10.11367/grsj1979.13.95  

    ISSN: 1883-5775 0388-6735

  240. Effects of Heat Transfer on Water-Steam Flow Accompanied by Boiling in a Porous Medium Peer-reviewed

    Yuichi Niibori, Tadashi Chida

    Journal of the Geothermal Research Society of Japan 13 (3) 157-166 1991

    DOI: 10.11367/grsj1979.13.157  

    ISSN: 1883-5775 0388-6735

  241. Model-Dependence of Size and Position of Heat Source in a Geothermal Reservoir Peer-reviewed

    Yuichi Niibori, Akira Yamanouchi, Akira Yamanouchi, Tadashi Chida

    Journal of the Geothermal Research Society of Japan 12 (2) 145-157 1990

    DOI: 10.11367/grsj1979.12.145  

    ISSN: 1883-5775 0388-6735

  242. Application of BEM to Underground Thermal Structure Analysis Peer-reviewed

    Yuichi NIIBORI, Tadashi CHIDA

    Distributed Parameter Systems:Modelling and Simulation (Proc.of IMACS/IFAC Int.Sympo.,'87), eds.,T. Futagami,S.G.Tzafestas & Y.Sunahara,North-Holland 287-293 1989

  243. Estimations of apparent relative permeabilities considered distribution of saturation Peer-reviewed

    Yuichi Niibori, Tadashi Chida

    Journal of the Geothermal Research Society of Japan 11 (4) 251-268 1989

    DOI: 10.11367/grsj1979.11.251  

    ISSN: 1883-5775 0388-6735

  244. Effects of Heat Transfer on Water-Steam Flow through a Porous Medium Peer-reviewed

    Y.Niibori, T.Chida

    Proceedings of International Symposium on Geothermal Energy, 1988 572-575 1988

  245. Effects of Phase-Change on Water-Steam Flow through a Porous Medium Peer-reviewed

    Yuuichi Nibori, Youichi Ogiwara, Tadashi Chida

    Journal of the Geothermal Research Society of Japan 9 (4) 271-283 1987

    DOI: 10.11367/grsj1979.9.271  

    ISSN: 1883-5775 0388-6735

  246. Effects of Heat Transfer on Tracer Response in a Geothermal Reservoir —A Theoretical Study— Peer-reviewed

    Yuuichi Niibori, Nobutoshi Wajima, Tadashi Chida, Shozo Tanaka

    Journal of the Geothermal Research Society of Japan 8 (3) 261-276 1986

    DOI: 10.11367/grsj1979.8.261  

    ISSN: 1883-5775 0388-6735

  247. A Proposal of Boundary Condition at a Permeable Surface with Heat Discharge — Its Application to Takenoyu Geothermal Area, Kumamoto, Japan — Peer-reviewed

    Tadashi Chida, Yuuichi Niibori

    Journal of the Geothermal Research Society of Japan 8 (3) 243-259 1986

    DOI: 10.11367/grsj1979.8.243  

    ISSN: 1883-5775 0388-6735

  248. A Calculation Method of Apparent Permeabilty and Its Application to a Geothermal Reservoir Model Peer-reviewed

    Yuuichi Niibori, Tadashi Chida, Shozo Tanaka

    Journal of the Geothermal Research Society of Japan 7 (4) 345-358 1985

    DOI: 10.11367/grsj1979.7.345  

    ISSN: 1883-5775 0388-6735

  249. Effects of Permeability Distribution on Flow and Heat Transfer in a Geothermal Reservoir Peer-reviewed

    Yuuichi Niibori, Tadashi Chida, Shozo Tanaka

    Journal of the Geothermal Research Society of Japan 6 (4) 263-277 1984

    DOI: 10.11367/grsj1979.6.263  

    ISSN: 1883-5775 0388-6735

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Misc. 20

  1. 原子力総合シンポジウム2022開催

    新堀 雄一

    日本原子力学会誌ATOMOΣ 65 (5) 338-338 2023

    Publisher: 一般社団法人 日本原子力学会

    DOI: 10.3327/jaesjb.65.5_338  

    ISSN: 1882-2606

    eISSN: 2433-7285

  2. 専門知とその基盤を育む日本原子力学会の役割の大きさを改めて考える

    新堀 雄一

    日本原子力学会誌ATOMOΣ 65 (9) 527-527 2023

    Publisher: 一般社団法人 日本原子力学会

    DOI: 10.3327/jaesjb.65.9_527  

    ISSN: 1882-2606

    eISSN: 2433-7285

  3. 経営改善への継続的取り組みとその方向性

    新堀 雄一

    日本原子力学会誌ATOMOΣ 64 (10) 591-591 2022

    Publisher: 一般社団法人 日本原子力学会

    DOI: 10.3327/jaesjb.64.10_591  

    ISSN: 1882-2606

    eISSN: 2433-7285

  4. 秋の大会理事会セッション報告

    新堀 雄一

    日本原子力学会誌ATOMOΣ 64 (1) 60-60 2022

    Publisher: 一般社団法人 日本原子力学会

    DOI: 10.3327/jaesjb.64.1_60  

    ISSN: 1882-2606

    eISSN: 2433-7285

  5. 放射性廃棄物処分の現状—特集 福島第一原子力発電所事故から10年 : 廃炉への化学のかかわり ; 放射性廃棄物の処理はどうなるのか?

    新堀 雄一

    化学 = Chemistry 76 (3) 32-34 2021/03

    Publisher: 京都 : 化学同人

    ISSN: 0451-1964

  6. 福島第一原子力発電所事故から10 年ー廃炉への化学のかかわり: 放射性廃棄物処分の現状 Invited

    新堀 雄一

    化学 76 (3) 18-20 2021/03

    ISSN: 0451-1964

  7. Present Status on the waste in the AESJ Review Committee on Decommissioning of the Fukushima Daiichi NPS Invited

    Yuichi Niibori

    Journal of the Atomic Energy Society of Japan 63 (3) 263-266 2021/03

    Publisher: Atomic Energy Society of Japan

    DOI: 10.3327/jaesjb.63.3_263  

    ISSN: 1882-2606

    eISSN: 2433-7285

  8. 秋の大会理事会セッション報告

    新堀 雄一

    日本原子力学会誌ATOMOΣ 63 (1) 85-85 2021

    Publisher: 一般社団法人 日本原子力学会

    DOI: 10.3327/jaesjb.63.1_85  

    ISSN: 1882-2606

    eISSN: 2433-7285

  9. 放射性廃棄物処分場周辺の亀裂流動場において生成する自己修復性バリアとその核種閉じ込め性—Nuclide Confinement Self-healing Barrier Formed in Crack Flow Field around Radioactive Waste Repository—特集 ポーラス体内における伝熱・流動・物質輸送現象と応用の最前線

    新堀 雄一

    伝熱 = Journal of the Heat Transfer Society of Japan 59 (248) 図巻頭1p,40-45 2020/07

    Publisher: 東京 : 日本伝熱学会

    ISSN: 1344-8692

  10. Introduction to Radioactive Waste -Management of Radioactive Waste from Operation and Decommissioning of Nuclear and Other Facilities (8): View of the Future Peer-reviewed

    Toshiaki OHE, Yuichi NIIBORI

    Journal of the Atomic Energy Society of Japan 57 (5) 356-361 2015/04

  11. 安全評価におけるバリア性能研究

    新堀 雄一

    JAERI-Conf (第7回NUSEFセミナー講演報文集) (011) 2004/02

  12. 1-4. 出前授業「放射線の検出・霧箱の製作」((第1分科会)これからの理科教育(特に物理教育)の果たす役割,分科会,第18回物理教育研究大会(仙台大会)の報告)

    新堀 雄一

    物理教育 49 (6) 581 2001

    Publisher: 日本物理教育学会

    DOI: 10.20653/pesj.49.6_581_2  

    ISSN: 0385-6992

    eISSN: 2432-1028

  13. 地中熱利用ヒ-トポンプ(GHP)の普及促進に関する国際共同研究

    新堀雄一

    新エネルギー・産業技術総合開発機構 平成11年度地球環境技術国際共同研究事業報告書 230-255 2000/03

  14. Subsurface Flow and Geological Disposal of High Level Radioactive Waste

    Yuichi Niibori, Osamu Tochiyama, Tadashi Chida

    Proceeding of Fall Meeting on Mining and Materials Processing 4 (4) 146-149 1996/10

    ISSN: 0919-7915

  15. WGC'95 スロバキア/ポーランド巡見 (5/16-5/20)

    新堀 雄一

    日本地熱学会誌 18 (1) 57-58 1996/01/25

    ISSN: 0388-6735

  16. Review of 19th Stanford (Univ.) Geothermal Reservoir Engineering Workshop

    Y.Niibori, T.Chida

    Journal of the Geothermal Energy Research & Development Co.,Ltd.(GERD) 19 (3&4) 19-24 1994/10

  17. Oil industries in China and waterflooding technique

    H.Cheng-Xie, H.Enomoto, Y.Niibori, T.Chida

    Journal of the Japanese Association For Petroleum Technology 59 (2) 136-141 1994/03

    Publisher: 石油技術協会

    DOI: 10.3720/japt.59.136  

    ISSN: 0370-9868

  18. Geothermal Reservoir Model Peer-reviewed

    T.Chida, Y.Niibori

    Journal of the Mining and Materials Processing Institute of Japan 106 (12) 705-712 1990/11

    DOI: 10.2473/shigentosozai.106.705  

  19. Two-Phase Flow through a Porous Medium :Effects of Phase-Change on Water-Steam Flow

    T.Chida, Y.Niibori

    旭硝子工業技術奨励会研究報告 52 (52) 185-191 1988

    Publisher: 旭硝子工業技術奨励会

    ISSN: 0365-2599

  20. Tracer Response Analysis in a Geothermal Reservoir

    T.Chida, Y.Niibori

    Geothermal Energy 11 (2) 146-157 1986/04

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Books and Other Publications 8

  1. Introduction of Dismantling and Decommissioning Chemistry

    Nobuaki Sato, Yutaka Kameo, Soichi Sato, Yuta Kumagai, Tomonori Sato, Masahiro Yamamoto, Yutaka Watanabe, Takayuki Nagai, Yuichi Niibori, Masayuki Watanabe, Takayuki Aoki, Masahiko Osaka, Shinichi Koyama

    Tohoku University Press, Sendai 2024/09/20

    ISBN: 9784861634024

  2. Chapter 6: Radioactive Waste Disposal in Engineering of Radioactive Wastes (edited by S.Nagasaki & S.Nakayama) (2nd Edition)

    Yuichi Niibori

    Ohmsha 2024/03

    ISBN: 9784274231766

  3. Chapter 6 Radioactive Waste Disposal in Radioactive Waste Engineering and Management edited by S. Nagasaki and S. Nakayama

    Yuichi Niibori

    Springer 2015/04

    ISBN: 9784431554165

    More details Close

    DoI 10.1007/978-4-431-55417-2

  4. Encyclopedia of Nuclear Engineering, Quantum Beam Science &Nuclear Fusion Science, III Nuclear Chemistry and Fuel Cycle

    Yuichi Niibori

    Maruzen Publishing Co., Ltd. 2014/12

  5. 原子力がひらく世紀(第3版) (第8章 放射性廃棄物の処理処分(改訂部))

    Yuichi Niibori

    Atomic Energy Society of Japan 2011/03/10

    ISBN: 9784890470969

  6. Engineering of Radioactive Wastes

    Niibori, Yuichi

    Ohmsha 2011/01/20

    ISBN: 9784274209697

    More details Close

    長﨑晋也・中山真一 共編 原子力教科書 「放射性廃棄物の工学」第6章 放射性廃棄物の処分(121頁~138頁)

  7. 社団法人 日本エネルギー学会編集 エネルギーの辞典(第4章 エネルギーの変換・利用, p.328-331)

    Yuichi Niibori

    朝倉書店 2009/10/25

    ISBN: 9784254201253

  8. 原子力がひらく世紀(第8章 放射性廃棄物の処理処分(改訂部))

    Yuichi NIIBORI

    Atomic Energy Society of Japan 2004/03

    ISBN: 4890470964

Show all Show first 5

Presentations 258

  1. Effect of Magnesium on the Interaction between Europium and Calcium-Silicate-Hydrate under the Condition Saturated with Saline Groundwater

    太原亮, 関亜美, 千田太詩, 新堀雄一

    日本原子力学会春の年会予稿集(CD-ROM) 2023

  2. Porosity and Permeability Changes with Solute Deposition Caused a Drying Processes around the Repository

    本郷幹太, 関亜美, 千田太詩, 新堀雄一

    日本原子力学会春の年会予稿集(CD-ROM) 2023

  3. Temperature dependencies of sorption behavior of cations onto biotite flakes

    小林凜太朗, 千田太詩, 関亜美, 新堀雄一

    日本原子力学会春の年会予稿集(CD-ROM) 2023

  4. Estimation of Deposition Behavior of Supersaturated Silicic Acid in the Presence of Magnesium Ions with Considering Temperature of Disposal Environment

    泉浦匡秀, 千田太詩, 関亜美, 新堀雄一

    日本原子力学会春の年会予稿集(CD-ROM) 2023

  5. Sorption Behaviors of Europium onto Calcium Silicate Hydrate in the Coexistence of Boric Acid under the Disposal Environment Temperature

    業天智貴, 関亜美, 千田太詩, 新堀雄一

    日本原子力学会春の年会予稿集(CD-ROM) 2022

  6. Evaluation of Retardation Effect of Cesium under Unsaturated Conditions Considering Channel Formation

    河上大昂, 関亜美, 千田太詩, 新堀雄一

    日本原子力学会春の年会予稿集(CD-ROM) 2022

  7. Evaluation of Sorption Characteristics of Selenate Ions onto Calcium Silicate Hydrate

    関亜美, 千田太詩, 新堀雄一

    日本原子力学会春の年会予稿集(CD-ROM) 2022

  8. Effects of Ca and Mg Ions on Deposition Behavior of Supersaturated Silicic Acid under the Condition of Saline Water

    白沢暢, 泉浦匡秀, 千田太詩, 関亜美, 新堀雄一

    日本原子力学会春の年会予稿集(CD-ROM) 2022

  9. Permeability Changes of Granite Flow-paths with Na-rich Highly Alkaline Groundwater using Micro-flow Cell and its Simple Evaluation Model

    降矢一輝, 関亜美, 千田太詩, 新堀雄一

    日本原子力学会春の年会予稿集(CD-ROM) 2022

  10. Experimental Study on Sorption Behavior of Cs and Sr onto Calcium Silicate Hydrate under the Formation Processes

    田村怜於, 関亜美, 千田太詩, 新堀雄一

    日本原子力学会春の年会予稿集(CD-ROM) 2022

  11. Evaluation of the Sorption Behavior of Europium onto Calcium-silicate-hydrate with Magnesium under the Condition Saturated with Saline Groundwater

    太原亮, 関亜美, 千田太詩, 新堀雄一

    日本原子力学会秋の大会予稿集(CD-ROM) 2022

  12. Sorption Behaviors for Selenate and Selenite Ions onto Calcium Silicate Hydrate

    関亜美, 前田一樹, 千田太詩, 新堀雄一

    日本原子力学会秋の大会予稿集(CD-ROM) 2022

  13. Estimation of the interaction of Europium and Ca-Al-Si Hydrates in the co-presence condition of Cesium and Barium

    天川仁誠, 千田太詩, 新堀雄一

    日本原子力学会春の年会予稿集(CD-ROM) 2021

  14. Some experimental trials on changes of mass transfer and hydraulic conductivity in porous media, considering a drying process before the closure of repository

    林光一, 新堀雄一, 千田太詩

    日本原子力学会春の年会予稿集(CD-ROM) 2021

  15. Evaluation of Channel Formation and Migration Behavior of Cesium under an Unsaturated Condition

    河上大昂, 新堀雄一, 関亜美, 千田太詩

    日本原子力学会秋の大会予稿集(CD-ROM) 2021

  16. Evaluation of Deposition Behavior of Supersaturated Silicic Acid in the Presence of Ca and Mg Ions

    白沢暢, 千田太詩, 関亜美, 新堀雄一

    日本原子力学会秋の大会予稿集(CD-ROM) 2021

  17. Evaluations of the Interaction between Europium and Calcium Silicate Hydrate with Magnesium as a Secondary Mineral

    太原亮, 千田太詩, 関亜美, 新堀雄一

    日本原子力学会秋の大会予稿集(CD-ROM) 2021

  18. 二チタン酸カリウムを用いたストロンチウム吸着材に関する基礎的研究

    森浩一, 篠原隆明, 三村均, 千田太詩, 新堀雄一

    化学工学会秋季大会研究発表講演要旨集(CD-ROM) 2021

  19. Changes of mass transfer and porosity distribution in porous media, considering a drying process before the closure of repository

    鹿野悟史, 新堀雄一, 千田太詩

    日本原子力学会春の年会予稿集(CD-ROM) 2020

  20. Technical options of radioactive waste management for the second half of the 21st Century, in consideration of Pu utilization and less environmentally impacted geological disposal (13) Waste management issues arising from Pu burning in LWR

    桜木智史, 朝野英一, 朝野英一, 岡村知拓, 三成映理子, 中瀬正彦, 竹下健二, 稲垣八穂広, 新堀雄一, 佐藤正知

    日本原子力学会春の年会予稿集(CD-ROM) 2020

  21. Technical options of radioactive waste management for the second half of the 21st Century, in consideration of Pu utilization and less environmentally impacted geological disposal, (16) Load evaluation of geological disposal for MOX fuel-derived wastes

    朝野英一, 朝野英一, 桜木智史, 三成映理子, 岡村知拓, 中瀬正彦, 竹下健二, 稲垣八穂広, 新堀雄一, 佐藤正知

    日本原子力学会春の年会予稿集(CD-ROM) 2020

  22. Track 5: Waste Management

    Journal of the Society of Mechanical Engineers 2019/10/05

  23. 質、量ともに未知なる廃棄物への取り組み Invited

    駒 義和, 新堀 雄一

    日本機械学会誌 2019/10

  24. 「NUMO包括的技術報告書レビュー特別専門委員会」活動状況 Invited

    2019/09/12

  25. 高硫酸イオン濃度条件におけるCSHゲルに対するCsの収着挙動評価

    田村直之, 千田太詩, 新堀雄一, KIM Seong-Yun

    日本原子力学会春の年会予稿集(CD-ROM) 2019

  26. 放射性廃棄物の処分環境を考慮したCa-Al-Si系水和物へのユウロピウムの収着挙動に関する基礎的研究

    種市やよい, 千田太詩, 新堀雄一

    日本原子力学会春の年会予稿集(CD-ROM) 2019

  27. 地下冠水環境におけるCa-Al-Si系水和物へのヨウ素の収着挙動の評価

    長洞麟太郎, 千田太詩, 新堀雄一

    日本原子力学会春の年会予稿集(CD-ROM) 2019

  28. 処分場周辺流動場を想定した過飽和ケイ酸の析出による透水性変化に関する基礎的研究

    田中翔悟, 小堤健紀, 千田太詩, 新堀雄一

    日本原子力学会春の年会予稿集(CD-ROM) 2019

  29. 不飽和な一次元カラム充填層を用いたセシウム移行挙動に関する基礎的研究

    小暮将之, 小堤健紀, 新堀雄一, 千田太詩

    日本原子力学会秋の大会予稿集(CD-ROM) 2019

  30. 緑泥石および絹雲母への過飽和ケイ酸の析出挙動に及ぼす共存イオンの影響

    齋藤聖史, 千田太詩, 新堀雄一

    日本原子力学会秋の大会予稿集(CD-ROM) 2019

  31. 不飽和層の迂回流路を考慮した核種移行挙動のモデル化に関する基礎的検討

    小堤健紀, 小暮將之, 新堀雄一, 千田太詩

    日本原子力学会秋の大会予稿集(CD-ROM) 2019

  32. MgイオンおよびAlイオン共存下における過飽和ケイ酸の析出挙動評価

    大向諄, 千田太詩, 新堀雄一

    日本原子力学会秋の大会予稿集(CD-ROM) 2019

  33. Multi-Path Modelによる不飽和層の核種移行挙動に関する基礎的検討

    小堤健紀, 小暮將之, 新堀雄一, 千田太詩

    日本原子力学会東北支部研究交流会講演要旨集 2019

  34. ドラッグデリバリーシステムと荷電粒子線併用治療のためのカプセルにおける薬剤担持および放出特性の評価

    長尾理那, 寺川貴樹, 藤原充啓, 松山成男, KIM Seong-Yun, 伊藤辰也, 新堀雄一, 千田太詩, 佐藤和宏

    日本原子力学会春の年会予稿集(CD-ROM) 2019

  35. 21世紀後半に向けた廃棄物管理の選択肢:Pu利用推進と環境負荷低減型地層処分に関する研究(9)ガラス固化プロセスにおける廃棄物含有率と処分場の負荷低減

    朝野英一, 朝野英一, 川久保政洋, 岡村知拓, 三成映理子, 中瀬正彦, 竹下健二, 稲垣八穂広, 新堀雄一, 佐藤正知

    日本原子力学会春の年会予稿集(CD-ROM) 2019

  36. Our Efforts on Research and Human Resource Development for Nuclear Decommissioning in Tohoku University Invited

    Takayuki Aoki, Yuichi Niibori, Yutaka Watanabe, Nobuyoshi Hara

    Journal of Nuclear Fuel Cycle and Environment 2018/12

  37. Self-healing function expressed in underground flooding environment Aiming at the development of nuclide confinement cement barrier

    NIIBORI Yuichi

    Kakenhi NEWS 2018/02

  38. Ca-Al-Si系水和物に対するヨウ素の収着挙動の評価

    長洞麟太郎, 小野寺駿, 千田太詩, 新堀雄一

    日本原子力学会春の年会予稿集(CD-ROM) 2018

  39. 蛍光発光スペクトルを用いたCa-Al-Si系水和物へのユウロピウムの収着挙動の評価

    種市やよい, 千田太詩, 新堀雄一

    日本原子力学会春の年会予稿集(CD-ROM) 2018

  40. 薄片試料による黒雲母および金雲母,白雲母へのユウロピウムの収着挙動評価

    石島雅也, 千田太詩, 新堀雄一

    日本原子力学会秋の大会予稿集(CD-ROM) 2018

  41. Mg共存下における過飽和ケイ酸の析出挙動の評価

    大向諄, 千田太詩, 新堀雄一

    日本原子力学会東北支部研究交流会講演要旨集 2018

  42. ドラッグデリバリーシステムと荷電粒子線の併用治療のためのマイクロカプセル開発

    長尾理那, 寺川貴樹, 藤原充啓, 金聖潤, 伊藤辰也, 佐藤和宏, 新堀雄一, 千田太詩, 鳴海慶一郎, 渡會穂玖斗

    日本原子力学会東北支部研究交流会講演要旨集 2018

  43. 21世紀後半に向けた廃棄物管理の選択肢:Pu利用推進と環境負荷低減型地層処分に関する研究(6)処分場負荷低減を目指したバックエンドシステム研究開発への提言

    竹下健二, 川合康太, 岡村知拓, 三成映理子, 川久保政洋, 坪能和宏, 朝野英一, 朝野英一, 千葉豪, 稲垣八穂広, 新堀雄一, 佐藤正知

    日本原子力学会春の年会予稿集(CD-ROM) 2018

  44. 21世紀後半に向けた廃棄物管理の選択肢:Pu利用推進と環境負荷低減型地層処分に関する研究(1)経緯,視点,研究展開

    佐藤正知, 新堀雄一, 稲垣八穂広, 千葉豪, 竹下健二, 川久保政洋, 坪能和宏, 朝野英一, 朝野英一

    日本原子力学会春の年会予稿集(CD-ROM) 2018

  45. Interaction of Radionuclide with Calcium Silicate Hydrate formed as a Secondary Mineral under a Condition without Drying Processes

    Yuichi Niibori

    JAEA-Review: Proceedings of the Research Conference on Cementitious Composites in Decommissioning and Waste Management (RCWM2017) 2017/11

  46. Concept of ensuring safety concerning burial disposal of low-level radioactive waste generated by operation and decommissioning of nuclear power plants

    Koichi YOSHIHARA, Takashi SEKIGUCHI, Kunihiro NAKAI, Yuichi NIIBORI

    Journal of RANDEC 2017/09/20

  47. Interaction of radionuclide with calcium silicate hydrate formed as a secondary mineral under a condition without drying processes International-presentation Invited

    Yuichi Niibori

    Research Conference on Cementitious Composites in Decommissioning and Waste Management (RCWM2017) 2017/06/21

    More details Close

    Session 4: Utilization of several materials

  48. Effects of high burn-up operation and extended cooling period of spent fuel on vitrification and storage period International-presentation

    Kota KAWAI, Hiroshi SAGARA, Kenji TAKESHITA, Masahiro KAWAKUBO, Hidekazu ASANO, Yaohiro INAGAKI, Yuichi NIIBORI, Seichi SATO

    ICAPP 2017 (2017 International Congress on Advances in Nuclear Power Plants) 2017/04/24

  49. 東北大学の取組紹介:廃止措置のための格納容器・建屋等信頼性維持と廃棄物処理・処分に関する基盤研究及び中核人材育成プログラム-特に化学工学と廃棄物処理・処分との関連- Invited

    Yuich Niibori

    化学工学会(芝浦工業大学豊洲キャンパス) 2017/03/07

  50. Sorption Behavior of Cationic Radionuclides on Biotite Flakes at pH 5 International-presentation

    Taiji Chida, Tomoyuki Toyota, Yuichi Niibori

    WM2017 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management 2017/03/02

  51. Flow Rate Dependency of Permeability Changes with the Deposition of CSH under the Highly Alkaline Ca-rich Condition International-presentation

    Daiki Kurata, Taiji Chida, Yuichi Niibori

    WM2017 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management 2017/03/02

  52. Estimation of Cs Migration under an Unsaturated Condition by Parallel-plate Experiments and 2D Advection- dispersion Model International-presentation

    Takumi Nemoto, Takenori Ozutsumi, Taiji Chida, Yuichi Niibori

    WM2017 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management 2017/03/02

  53. Influence of Calcium Concentration on Permeability Changes in Flow-paths Altered by Highly Alkaline Groundwater International-presentation

    Ryo Tashiro, Daiki Kurata, Taiji Chida, Yuichi Niibori

    WM2017 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management 2017/03/02

  54. Sorption Behavior of Iodide Ions on Calcium Silicate Hydrate Formed under the Condition saturated with Saline Water International-presentation

    Hirotaka Tago, Taiji Chida, Yuichi Niibori

    WM2017 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management 2017/03/02

  55. Sorption Behavior of Cesium Ions on Calcium Aluminosilicate Hydrate under the Condition Saturated with Saline Water. International-presentation

    Hisatoshi Kasahara, Taiji Chida, Yuichi Niibori

    WM2017 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management 2017/03/02

  56. カルシウムシリケート水和物の形成およびセシウム収着挙動に及ぼすホウ酸塩の影響

    原直哉, 千田太詩, 新堀雄一

    日本原子力学会春の年会予稿集(CD-ROM) 2017

  57. 埋め戻し材の変質を考慮したイライトへの過飽和ケイ酸の析出挙動の評価

    小山伸也, 笹川剛, 千田太詩, 新堀雄一

    日本原子力学会春の年会予稿集(CD-ROM) 2017

  58. 塩水環境における薄片状黒雲母へのユウロピウムの収着挙動

    豊田丈通, 千田太詩, 新堀雄一

    日本原子力学会秋の大会予稿集(CD-ROM) 2017

  59. セメント間隙水による花崗岩中の流路変化に関する基礎的研究

    倉田大輝, 千田太詩, 新堀雄一

    日本原子力研究開発機構JAEA-Review(Web) 2017

  60. 深地下環境を考慮した薄片状雲母鉱物へのユウロピウムの収着挙動

    石島雅也, 豊田丈通, 千田太詩, 新堀雄一

    日本原子力学会東北支部研究交流会講演要旨集 2017

  61. 地層処分場周辺環境における過飽和ケイ酸の析出挙動の評価

    田中翔悟, 笹川剛, 千田太詩, 新堀雄一

    日本原子力学会東北支部研究交流会講演要旨集 2017

  62. カルシウムシリケート水和物へのヨウ素収着に及ぼす塩化物イオンの影響

    長洞麟太郎, 小野寺駿斗, 千田太詩, 新堀雄一

    日本原子力学会東北支部研究交流会講演要旨集 2017

  63. 埋め戻し材の変質を考慮したイライトへの過飽和ケイ酸析出挙動の温度依存性

    小山伸也, 笹川剛, 千田太詩, 新堀雄一

    日本原子力学会秋の大会予稿集(CD-ROM) 2017

  64. 地層処分場周辺におけるコロイド状ケイ酸の解重合を伴う析出過程に関する基礎的研究

    笹川剛, 照井雄大, 千田太詩, 新堀雄一

    日本応用地質学会研究発表会講演論文集 2017

  65. 東北大学における原子炉廃止措置基盤研究と人材育成への取り組み状況

    青木孝行, 渡邉 豊, 新堀雄一, 原 信義

    Maintenokogy 2017/01/01

  66. 地層処分における安全評価の現状と課題 Invited

    Yuichi Niibori

    高レベル放射性廃棄物処分研究連絡会(第3回) 2016/12/10

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    名古屋大学, 平成28年12月10日 (2016)

  67. Revision draft of Standard for Safety Assessment Method for Near Surface Disposal

    Kunihiro NAKAI, Yutaka KAWAKAMI, Yuichi NIIBORI, Masafumi YAMAMOTO, Koichi YOSHIHARA, Mitsuru KUROSAWA

    Journal of Nuclear Fuel Cycle and Environment 2016/12/01

  68. Revision of Standard for Post-closure Controls of Disposal Facilities for Low Level Radioactive Waste

    Takashi SEKIGUCHI, Yuichi NIIBORI, Masafumi YAMAMOTO, Koichi YOSHIHARA, Takahito MIKI

    Journal of Nuclear Fuel Cycle and Environment 2016/12/01

  69. Several Analysis Cases of Dosage Evaluation at the Restoration place model in Fukushima by utilizing the Standard of Safety Evaluation Method for Shallow Land Disposal

    Koichi YOSHIHARA, Yuichi NIIBORI, Mitsuru KUROSAWA

    Journal of Nuclear Fuel Cycle and Environment 2016/12/01

  70. Sorption Behavior of Cesium on Calcium Silicate Hydrate under High Carbonate Ion Concentration Conditions International-presentation

    Naoyuki TAMURA, Taiji CHIDA, Yuichi NIIBORI, Seong-Yun KIM

    5th International Symposium on Innovative Nuclear Energy Systems, INES-5 2016/10/31

    More details Close

    Ookayama Campus, Tokyo Institute of Technology

  71. Effects of Temperature on Deposition Rate of Supersaturated Silicic Acid on Ca-type Bentonite International-presentation

    Tsuyoshi Sasagawa, Taiji Chida, Yuichi Niibori

    The 2016 24th International Conference on Nuclear Engineering 2016/06/26

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    10.1115/ICONE24-60979

  72. 大学におけるバックエンド分野の人材育成について -東北大学量子エネルギー工学専攻の事例を参考にして- Invited

    Yuichi Niibori

    「核燃料サイクル・バックエンドの科学 ―その研究教育の在り方」シンポジウム 2016/06/25

  73. Evaluation of Retardation Effect of Cesium Ions through Groundwater Unsaturated Zone International-presentation

    Takenori Ozutsumi, Yuichi Niibori, Taiji Chida

    The 2016 24th International Conference on Nuclear Engineering 2016/06/23

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    10.1115/ICONE24-60979

  74. 地層処分の新たな展開に向けて:場の「変動と安定」とそのスケール感の重要性

    Yuichi Niibori

    Journal of Nuclear Fuel Cycle and Environment 2016/06/15

  75. 廃棄物処分研究の成果―高塩濃度及び従来と異なる廃棄物が処分に与える影響評価―

    出光一哉, 小崎完, 佐藤努, 新堀雄一

    日本原子力学会春の年会予稿集(CD-ROM) 2016/03/16

  76. Deposition Behavior of Supersaturated Silicic Acid on Ca-type Bentonite in Geological Disposal System International-presentation

    Tsuyoshi Sasagawa, Taiji Chida, Yuichi Niibori

    WM2016(HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) Conference 2016/03/07

  77. Migration Rates of Some Cations in Unsaturated Layer around the Near-Surface Disposal Facilities of Radioactive Wastes International-presentation

    Takenori Ozutsumi, Yuichi Niibori, Taiji Chida

    WM2016(HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) Conference 2016/03/07

  78. Alteration Behavior of Granite Minerals Forming Calcium Silicate Hydrate under a Ca-Rich Highly Akaline Condition International-presentation

    Hiten Fujita, Ryo Tashiro, Taiji Chida, Yuichi Niibori

    WM2016(HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) Conference 2016/03/07

  79. Interaction of Cesium and Barium Ions with Calcium Silicate Hydrate under a Geological Temperature Condition International-presentation

    Taiji Chida, Yuta Saito, Yuichi Niibori

    WM2016(HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) Conference 2016/03/07

  80. 福島原発事故で発生した廃棄物の合理的な処理・処分システム構築に向けた基盤研究(57)塩水環境におけるアルミニウム含有カルシウムシリケート水和物へのセシウムの収着挙動

    笠原久稔, 千田太詩, 新堀雄一

    日本原子力学会春の年会予稿集(CD-ROM) 2016

  81. 地下冠水環境におけるカルシウムシリケート水和物によるバリア機能の評価手法

    新堀雄一, 千田太詩, 桐島陽

    日本原子力学会秋の大会予稿集(CD-ROM) 2016

  82. 環境水中のウラン化学種安定性の評価によるセメント系材料閉込効果の定量化検討

    山村朝雄, 高橋晃, 白崎謙次, 永井満家, 新堀雄一, 千田太詩

    日本原子力学会春の年会予稿集(CD-ROM) 2016

  83. セシウムおよびストロンチウムの移行挙動に及ぼす液相飽和率変化の影響

    小堤健紀, 新堀雄一, 千田太詩

    日本原子力学会秋の大会予稿集(CD-ROM) 2016

  84. 塩化物イオン共存下におけるカルシウムシリケート水和物へのヨウ化物イオンの収着挙動

    小野寺駿斗, 田児啓貴, 千田太詩, 新堀雄一

    日本原子力学会秋の大会予稿集(CD-ROM) 2016

  85. マイクロフローセルを用いたCa含有高アルカリ性地下水と花崗岩表面の相互作用の評価

    林真行, 田代龍, 倉田大輝, 新堀雄一, 千田太詩

    日本原子力学会秋の大会予稿集(CD-ROM) 2016

  86. 薄片状黒雲母へのユウロピウムの収着におけるpH依存性

    豊田丈通, 千田太詩, 新堀雄一

    日本原子力学会秋の大会予稿集(CD-ROM) 2016

  87. 地層処分場近傍高アルカリ領域における亀裂変質と核種移行との関係

    倉田大輝, 田代龍, 新堀雄一, 千田太詩

    日本原子力学会東北支部研究交流会講演要旨集 2016

  88. Na型ベントナイトへの過飽和ケイ酸の析出挙動

    笹川剛, 千田太詩, 新堀雄一

    日本原子力学会秋の大会予稿集(CD-ROM) 2016

  89. 地層処分場周辺の温度条件におけるCa型ベントナイトに対する過飽和ケイ酸析出挙動の評価

    笹川剛, 千田太詩, 新堀雄一

    日本原子力学会春の年会予稿集(CD-ROM) 2016

  90. 165 Estimation of Permeability Distribution Based on Temperature and Pressure Well-Logging Data for Geothermal Energy Development

    ASAKI Miho, NIIBORI Yuichi, HASHIDA Toshiyuki

    2016

  91. Performance and safety assessment: Design and safety functions International-presentation

    2015 Technical Workshop for The High Level Radioactive Final Disposal Program 2015/10/20

  92. 東北大学量子エネルギー工学専攻におけるバックエンドに関連するカリキュラム事例 Invited

    Yuichi Niibori

    日本原子力学会 2015/09/09

    More details Close

    総合講演・報告4 「東京電力福島第一原子力発電所以降の低レベル放射性廃棄物処理処分の在り方」特別専門委員会報告

  93. バックエンド技術分野の大学における人材育成について

    井口哲夫, 小崎完, 新堀雄一, 柳原敏

    日本原子力学会秋の大会予稿集(CD-ROM) 2015/08/21

  94. EFFECTS OF SUPERSATURATED SILICIC ACID CONCENTRATION ON DEPOSITION RATE AROUND GEOLOGICAL DISPOSAL SYSTEM International-presentation

    Tsuyoshi Sasagawa, Taiji Chida, Yuichi Niibori, Hitoshi Mimura

    23rd International Conference on Nuclear Engineering 2015/05/17

  95. Interactions of Cesium and Barium Ions with Calcium Silicate Hydrate under the Condition Saturated with Saline Water International-presentation

    Yuta Saito, Taiji Chida, Yuichi Niibori, Hitoshi Mimura

    WM2015(HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) Conference 2015/03/03

  96. Influences of Temperature on Permeability Changes of Flow-paths Altered by Highly Alkaline Ca-rich Groundwater International-presentation

    Taiji Chida, Daiki Kurata, Yuichi Niibori, Hitoshi Mimura

    WM2015(HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) Conference 2015/03/03

  97. Effects of pH on Deposition Rate of Supersaturated Silicic Acid around Geological Disposal System International-presentation

    Tsuyoshi Sasagawa, Taiji Chida, Yuichi Niibori, Hitoshi Mimura

    WM2015(HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) Conference 2015/03/03

  98. Selective Separation of Sr by Potassium Titanates from Solution of Nitrate International-presentation

    Hitoshi Kanda, Hitoshi Mimura, Yuichi Niibori, Mamoru Iwasaki, Koichi Mori

    WM2015(HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) Conference 2015/03/03

  99. 福島原発事故で発生した廃棄物の合理的な処理・処分システム構築に向けた基盤研究(41)高塩分冠水環境におけるCSHへのCsおよびBaの収着挙動の比較

    千田太詩, 斎藤雄太, 新堀雄一, 三村均

    日本原子力学会春の年会予稿集(CD-ROM) 2015

  100. 高塩水環境下におけるヨウ化物イオンのカルシウムシリケート水和物への収着挙動

    田児啓貴, 千田太詩, 新堀雄一

    日本原子力学会秋の大会予稿集(CD-ROM) 2015

  101. カラム充填層を用いた地下水不飽和帯における核種遅延効果の評価

    小堤健紀, 新堀雄一, 千田太詩

    日本原子力学会秋の大会予稿集(CD-ROM) 2015

  102. 福島原発事故で発生した廃棄物の合理的な処理・処分システム構築に向けた基盤研究(49)乾燥過程を経ないアルミニウム含有カルシウムシリケート水和物へのセシウムの収着挙動

    笠原久稔, 千田太詩, 新堀雄一

    日本原子力学会秋の大会予稿集(CD-ROM) 2015

  103. マイクロフローセルを用いた高アルカリ地下水による透水性変化の評価

    田代龍, 新堀雄一, 千田太詩

    日本原子力学会秋の大会予稿集(CD-ROM) 2015

  104. カラム充填層を用いた再冠水に伴う不飽和条件変動場における物質移行の評価

    根本匠, 小堤健紀, 千田太詩, 新堀雄一

    日本原子力学会秋の大会予稿集(CD-ROM) 2015

  105. 多孔質層における核種移行挙動へ及ぼす不飽和形成領域の影響

    小堤健紀, 新堀雄一, 千田太詩

    日本原子力学会東北支部研究交流会講演要旨集 2015

  106. 埋め戻しによって形成されるCa型ベントナイトへの過飽和ケイ酸の析出挙動

    笹川剛, 千田太詩, 新堀雄一

    日本原子力学会秋の大会予稿集(CD-ROM) 2015

  107. セメント利用に起因する処分場近傍のケイ素の空間的再分配とそのバリア性能

    笹川剛, 千田太詩, 新堀雄一

    日本原子力学会東北支部研究交流会講演要旨集 2015

  108. 地熱開発のための温度・圧力検層データを用いた地下浸透率分布の推定

    近藤早紀, 鈴木杏奈, 岩垣巧, 朝木美帆, 新堀雄一, 橋田俊之

    日本機械学会東北支部総会・講演会講演論文集(CD-ROM) 2015

  109. A DOUBLE POROSITY MODEL TO DESCRIBE BOTH PERMEABILITY CHANGE AND DISSOLUTION PROCESSES International-presentation

    Yuichi Niibori, Hideo Usui, Taiji Chida, Hitoshi Mimura

    The 2014 22nd International Conference on Nuclear Engineering 2014/05/01

  110. Selective Uptake of Sr and Stable Solidification Using Potassium Titanates International-presentation

    Hitoshi Kanda, Hitoshi Mimura, Kouichi Mori, Mamoru Iwasaki, Toshiki Goto, Yuichi Niibori, Nobuki Itoi

    The 2014 22nd International Conference on Nuclear Engineering 2014/05/01

  111. Estimation of Permeability Changes due to Contact with Highly Alkaline Ca-rich Solution by Micro Flow-Cell of Granite Chip International-presentation

    Daiki Kurata, Taiji Chida, Yuichi Niibori, Hitoshi Mimura

    WM2014 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) Conference 2014/03/02

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    Paper No. 14094

  112. Raman Spectra of Calcium Silicate Hydrates Sorbing Iodine Ions in Saline Groundwater International-presentation

    Jun Furuya, Taiji Chida, Yuichi Niibori, Hitoshi Mimura

    WM2014 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) Conference 2014/03/02

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    Paper No. 14077

  113. The Influence of Calcium Ions on Migration of Colloidal Silicic Acid in the Presence of Solid phase International-presentation

    Taiji Chida, Yuichi Niibori, Hitoshi Mimura

    WM2014 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) Conference 2014/03/02

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    Paper No. 14123

  114. ラマン分光分析法を用いたCSHゲル及びハイドロタルサイトへのヨウ素の収着挙動の評価

    古谷純, 千田太詩, 新堀雄一, 三村均, 桐島陽

    日本原子力学会春の年会予稿集(CD-ROM) 2014

  115. 地下水によって飽和されていない条件における遅延効果の変化

    小堤健紀, 新堀雄一, 千田太詩, 三村均

    日本原子力学会秋の大会予稿集(CD-ROM) 2014

  116. 福島原発事故で発生した廃棄物の合理的な処理・処分システム構築に向けた基盤研究(20)高塩分冠水環境におけるカルシウムシリケート水和物へのセシウムの収着挙動に関する実験的検討

    斎藤雄太, 岩井郁実, 千田太詩, 新堀雄一, 三村均

    日本原子力学会春の年会予稿集(CD-ROM) 2014

  117. 福島原発事故で発生した廃棄物の合理的な処理・処分システム構築に向けた基盤研究(30)高塩分冠水環境におけるCSHへのセシウムの表面収着挙動

    斎藤雄太, 千田太詩, 岩井郁実, 新堀雄一, 三村均

    日本原子力学会秋の大会予稿集(CD-ROM) 2014

  118. Caイオン含有高アルカリ地下水による花崗岩変質に伴うCSHの生成挙動

    藤田飛天, 新堀雄一, 三村均, 千田太詩, 倉田大輝

    日本原子力学会秋の大会予稿集(CD-ROM) 2014

  119. 蛍光スペクトルおよびTOF-SIMSによる薄片状黒雲母に対するユウロピウム(III)の収着および拡散挙動

    杉山翔一, 佐々木剛, 千田太詩, 新堀雄一, 三村均

    日本原子力学会秋の大会予稿集(CD-ROM) 2014

  120. 処分場近傍におけるケイ酸析出挙動による流路閉塞効果の評価

    笹川剛, 千田太詩, 新堀雄一, 三村均

    日本原子力学会東北支部研究交流会講演要旨集 2014

  121. 温度検層データを用いた地下浸透率分布推定法に関する基礎的研究

    近藤早紀, 岩垣巧, 朝木美帆, 鈴木杏奈, 新堀雄一, 橋田俊之

    日本地熱学会学術講演会講演要旨集 2014

  122. Deposition Behavior of Supersaturated Silicic Acid in the Condition of Relatively High Ca or Na Concentration International-presentation

    Taiji Chida, Yuichi Niibori, Hayata Shinmura, Hitoshi Mimura

    Scientific Basis for Nuclear Waste Management XXXVII (Materials Research Society Symo.) 2013/09/29

  123. Selective Adsorption and Stable Solidification of Radioactive Cesium Ions International-presentation

    Hitoshi Mimura, Pham Luong Thi Quynh, Yuichi Niibori, Yuki Ikarashi, Yan Wu, Yue-Zhou Wei

    THE 15th INTERNATIONAL CONFERENCE ON ENVIRONMENTAL REMEDIATION AND RADIOACTIVE WASTE MANAGEMENT 2013/09/08

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    Paper No. ICEM2013-96130 p.1-8

  124. 「福島第一原子力発電所事故により発生する放射性廃棄物の処理・処分」特別専門委員会報告 ~研究開発課題の抽出と解決に向けた考え方~ (1) 全体概要

    日本原子力学会 2013/09/03

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    2013年日本原子力学会秋の大会 企画セッション

  125. 福島原発事故で発生した廃棄物の合理的な処理・処分システム構築に向けた基盤研究(1)全体概要とトピックス

    池田泰久, 竹下健二, 小崎完, 佐藤努, 佐藤修彰, 桐島陽, 三村均, 新堀雄一, 佐々木隆之, 鈴木達也, 稲垣八穂広, 出光一哉

    日本原子力学会秋の大会予稿集(CD-ROM) 2013/08/20

  126. FLUORESCENCE EMISSION BEHAVIOR OF Eu(III) SORBED ON CALCIUM SILICATE HYDRATES FORMED WITH NO DRIED PROCESS International-presentation

    Yuichi Niibori, Masayuki Narita, Akira Kirishima, Taiji Chida, Hitoshi Mimura

    The 21th International Conference on Nuclear Engineering 2013/07/29

  127. 地中熱利用に関する熱交換技術の現状と今後の見通し

    第13回埼玉大学産学交流会テクノカフェ(埼玉県産学連携支援ネットワーク会議セミナー) 2013/03/07

  128. トレーサー応答および地下温度分布を用いた地熱貯留層内き裂分布の推定に関する研究

    蒔田浩士, 近藤早希, 鈴木杏奈, 新堀雄一, 橋田俊之

    日本機械学会東北支部総会・講演会講演論文集 2013/03

  129. Fundamental Study on Temperature Dependence of Deposition Rate of Silicic Acid International-presentation

    Hayata Shinmura, Yuichi Niibori, Hitoshi Mimura

    WM2013 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) Conference 2013/02/24

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    Paper No. 13270

  130. Evaluation of Adsorption Properties for Cs and Sr Selective Adsorbents International-presentation

    Tomonori Nakai, Syunya Wakabayashi, Hitoshi Mimura, Yuichi Niibori, Hiroshi Tanigawa, Eiji Ishizaki, Fumio Kurosaki, Minoru Matsukura

    WM2013 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) Conference 2013/02/24

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    Paper No. 13171

  131. Estimation of Sorption Behavior of Europium(III) Using Biotite Flakes International-presentation

    Go Sasaki, Yuichi Niibori, Akira Kirishima, Hitoshi Mimura

    WM2013 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) Conference 2013/02/24

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    Paper No. 13272 WM2013 Best Poster Award

  132. 福島原発事故で発生した廃棄物の合理的な処理・処分システム構築に向けた基盤研究(8)高塩分冠水環境におけるカルシウムシリケート水和物の安定性に関する検討

    新堀雄一, 古谷純, 船橋泰平, 千田太詩, 桐島陽, 三村均

    日本原子力学会秋の大会予稿集(CD-ROM) 2013

  133. 吸着剤を用いたホウ酸環境下における各種放射性核種の除去

    藤田夏輝, 三村均, 新堀雄一, 千田太詩, 小林高陽, 関野幸一, 長嶺邦孝

    日本イオン交換研究発表会講演要旨集 2013

  134. 処分場周辺におけるケイ酸の析出挙動に及ぼす過飽和濃度の影響

    笹川剛, 千田太詩, 新堀雄一, 三村均

    日本原子力学会秋の大会予稿集(CD-ROM) 2013

  135. 温度検層データに基づく貯留層浸透率分布の推定法に関する基礎的研究

    近藤早紀, 鈴木杏奈, 蒔田浩士, 新堀雄一, 橋田俊之

    日本地熱学会学術講演会講演要旨集 2013

  136. 断裂型貯留層における還元に伴う物質移動予測

    鈴木杏奈, 近藤早紀, 新堀雄一, 橋田俊之

    日本地熱学会学術講演会講演要旨集 2013

  137. Some Experiments on Sorption Behavior of Iodide ions into CSH Gel under the Condition Saturated with Saline Groundwater International-presentation

    Yuichi Niibori, Taihei Funabashi, Hitoshi Mimura

    Scientific Basis for Nuclear Waste Management XXXVI (Material Research Society Symp.) 2012/11/26

  138. 断裂型地熱貯留層におけるき裂構造推定のためのトレーサー挙動のキャラクタリゼーション

    鈴木杏奈, 蒔田浩士, 新堀雄一, 橋田俊之

    日本機械学会東北支部総会・講演会講演論文集 2012/03

  139. Sorption Behavior of Eu(III) into CSH Gel in Imitated Saline Groundwater International-presentation

    Taihei Funabashi, Yuichi Niibori, Hitoshi Mimura

    WM2012 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) Conference 2012/02/26

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    Paper No. 12145

  140. Some Fundamental Experiments on Apparent Dissolution Rate of Gas Phase in the Groundwater Recovery Processes of the Geological Disposal System International-presentation

    Taiki Yoshii, Yuichi Niibori, Hitoshi Mimura

    WM2012 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) Conference 2012/02/26

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    Paper No. 12146

  141. Development of Stable solidification Method for Insoluble Ferrocyanide (1)

    Ikarashi Yuki, Rana Syed Masud, Mimura Hitoshi, Niibori Yuichi, Ishizaki Eiji, Matukura Minoru

    Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan 2012

  142. Evaluation of adsorption properties of Cs and Sr selective adsorbents

    Nakai Tomonori, Wakabayashi Shunya, Mimura Hitoshi, Niibori Yuuichi, Tanikawa Hiroshi, Ishizaki Eiji, Kurosaki Humio, Matsukura Minoru

    Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan 2012

  143. Mutual separation of minor actinides by the novel hydrophilic and lipophilic diamide compounds:(10) Separation of Ln by SiO2-P adsorbents impregnated with extractants in the presence of hydrophilic complexing agents

    YAMANISHI Kei, USUDA Shigekazu, MIMURA Hitoshi, NIIBORI Yuichi, SASAKI Yuji

    Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan 2012

  144. Micro flow-cell testing of the permeability change with high alkalization around the geological repository

    Kurata Daiki, Niibori Yuichi, Mimura Hitoshi

    Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan 2012

  145. SELECTIVE UPTAKE OF PALLADIUM BY NOVEL HYBRID MICROCAPSULES ENCLOSING INSOLUBLE COPPER FERROCYANIDES

    Hitoshi Mimura, Takenori Kuzumaki, Yuichi Niibori, Takashi Ohnishi, Shin-ichi Koyama

    The Ion Exchange Conference (IEX 2012) 2012

  146. トレーサー応答・温度データに基づく貯留層内き裂分布の推定に関する研究

    蒔田浩士, 鈴木杏奈, 新堀雄一, 橋田俊之

    日本地熱学会学術講演会講演要旨集 2012

  147. 非整数階微分を用いたトレーサー解析による貯留層挙動評価

    鈴木杏奈, 蒔田浩士, 新堀雄一, 橋田俊之

    日本地熱学会学術講演会講演要旨集 2012

  148. 土壌へのセシウムの収着に関連して

    第5回東北原子力シンポジウム 2011/10/28

  149. A calculation of spatial range of colloidal silicic acid deposited downstream from the alkali front International-presentation

    Yuichi Niibori, Kazuki Iijima, Naoyuki Tamura, Hitoshi Mimura

    19th International Conference on Nuclear Engineering 2011/10/24

  150. Deposition of Calcium-Silicate-Hydrate Gel on Rough Surface of Granite from Calcium-rich Highly Alkaline Plume International-presentation

    Yuichi Niibori, Kyo Komatsu, Hitoshi Mimura

    Scientific Basis for Nuclear Waste Management XXXV (Materials Research Society Symo.) 2011/10/02

  151. 地熱貯留層涵養を目的とした複雑き裂システムにおける物質移動モデルに関する研究

    鈴木杏奈, 千葉隆一, 蒔田浩士, 新堀雄一, 橋田俊之

    日本機械学会東北支部総会・講演会講演論文集 2011/03

  152. Deposition Rates of Polymeric Silicic Acid onto the Surface of Silicate Minerals in theCo-presence of Ca Ions International-presentation

    Naoyuki Tamura, Yuichi Niibori, Hitoshi Mimura

    WM2011 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) 2011/02/27

  153. Identification of Eu(III) Sorption into CSH Gel by the Changes of Fluorescence Emission Spectrum and BET Surface Area International-presentation

    Yuichi Niibori, Keisuke Shirai, Hiroaki Yoshikawa, Hitoshi Mimura

    WM2011 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) 2011/02/27

  154. 複雑系物質移動モデルに基づくトレーサー解析手法の開発

    蒔田浩士, 鈴木杏奈, 新堀雄一, 橋田俊之

    日本地熱学会学術講演会講演要旨集 2011

  155. 断裂型貯留層における注水涵養に向けたトレーサー挙動予測

    鈴木杏奈, 蒔田浩士, 新堀雄一, 橋田俊之

    日本地熱学会学術講演会講演要旨集 2011

  156. Selective uptake of cesium by mordenite enclosing AMP microcapsules International-presentation

    S. Kanome, H. Mimura, Y. Niibori

    OECD Nuclear Energy Agency 11th Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation 2010/11/01

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    Session II: Waste forms and geological disposal, II-3

  157. Selectve adsoption of cesium by hybrid microcapsules enclosing AWP International-presentation

    A. Murao, H. Mimura, Y. Niibori

    OECD Nuclear Energy Agency 11th Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation 2010/11/01

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    Session II: Waste forms and geological disposal, II-4

  158. Immobilization of cesium by zeolites and characterization of ceramic solid forms International-presentation

    S. Tomiyama, H. Mimura, Y. Niibori, U. Tohoku, Ja, I. Yamagishi, Y. Morita, JAEA, Ja

    OECD Nuclear Energy Agency 11th Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation 2010/11/01

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    Session II: Waste forms and geological disposal, II-7

  159. 東北大学における原子力人材育成の現状(原子力人材育成プログラムの取り組み)

    日本原子力学会東北支部第4回東北原子力シンポジウム 2010/10/19

  160. Sorption Behavior of Iodine on Calcium Silicate Hydrates Formed as a Secondary Mineral International-presentation

    Keisuke Shirai, Yuichi Niibori, Akira Kirishima, Hitoshi Mimura

    13th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM2010) 2010/10/03

  161. Selective Uptake of Palladium from High-Level Liquid Wastes by Hybrid Microcapsules Enclosed with Insoluble Ferrocyanides International-presentation

    Hitoshi Mimura, Takashi Sakakibara, Wu Yan, Yuichi Niibori, Shin-ichi Koyama, Takashi Ohnishi

    13th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM2010) 2010/10/03

  162. 8-221 Human Resources Development Program for Nuclear Engineering in Tohoku University

    HASHIZUME Hidetoshi, NIIBORI Yuichi, TAKAHASHI Makoto

    2010/08/19

  163. 標準委員会セッション 2 低レベル放射性廃棄物に係る埋設施設の検査方法及び埋設後の管理方法

    東北大院, 工 新堀雄一, 原子力安全研究協会, 川上 泰, 日本原子力技術協会, 吉原恒一

    日本原子力学会 2010/03/28

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    2010年3月28日13:00-14:30 M会場 日本原子力学会標準委員会 LLW施設検査方法分科会, LLW埋設後管理方法分科会

  164. 「地層処分の実力を示す」ネットワーク コロイドWGの活動

    連携重点 「地層処分の実力を示す」ネットワーク 第2回情報交換会 2010/03/18

  165. Sorption Behavior of Eu(III) Into Calcium Silicate Hydrate (CSH) Gel With Relatively Low Ca/Si Ratio <1.0 International-presentation

    Masayuki Narita, Yuichi Niibori, Hitoshi Mimura, Akira Kirishima, Joonhong Ahn

    WM2010 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) 2010/03/07

  166. Dynamic behavior of silicic acid in the co-presence of the solid phase and Ca ions International-presentation

    Naoyuki Tamura, Yuichi Niibori, Kazuki Iijima, Hitoshi Mimura

    WM2010 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) 2010/03/07

  167. Selective separation and recovery of Mo(VI) by hybrid microcapsules containing organic extractants International-presentation

    Kaoru Ikeda, Yan Wu, Hitoshi Mimura, Yuichi Niibori, Yoshito Wakui, Masahiko Osaka, Shinichi Koyama, Takashi Ohnis

    WM2010 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) 2010/03/07

  168. SELECTVE ADSOPTION OF CESIUM BY HYBRID MICROCAPSULES ENCLOSING AWP

    Ayako Murao, Hitoshi Mimura, Yuichi Niibori, Isao Yamagishi, Masaki OZAWA

    The 11th OECD/NEA Information Meeting 2010

  169. 断裂型貯留層を対象とした物質移動におけるNon‐Fickian挙動のキャラクタリゼーション

    鈴木杏奈, 千葉隆一, 蒔田浩士, 新堀雄一, 橋田俊之

    日本地熱学会学術講演会講演要旨集 2010

  170. 東北大学量子エネルギー工学専攻の文部科学省・経済産業省 原子力人材育成プログラムの取り組み

    橋爪秀利, 新堀雄一, 高橋 信, 渡辺 豊, 伊藤 悟

    日本原子力学会東北支部第3回東北原子力シンポジウム 2009/10/20

  171. Uncertainty of Relative-permeability to Describe Two-phase Flow in Geological Disposal System International-presentation

    Yuichi NIIBORI, Joonhong AHN, Hitoshi MIMURA

    13th International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2009/09/27

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    発表日 2009年9月30日

  172. 様々なプルトニウム同位体組成比を持つMOX燃料の利用がハル・エンドピース圧縮廃棄体の地層処分に与える影響

    平野史生, 佐藤正知, 小崎完, 稲垣八穂広, 岩崎智彦, 新堀雄一, 大江俊昭, 加藤和之, 北山一美, 鳥飼誠之, 長崎晋也

    日本原子力学会秋の大会予稿集(CD-ROM) 2009/08/28

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    軽水炉での使用が予定されているMOX燃料の初期組成は、使用済みUO&lt;SUB&gt;2&lt;/SUB&gt;燃料の燃焼度や冷却期間、あるいはMOX燃料の貯蔵期間によって様々である。こうしたパラメーターがハル・エンドピース圧縮廃棄体の地層処分システムに及ぼす熱影響を評価した。

  173. 処分場近傍開放系におけるき裂内の流体流動とコロイド挙動の精緻化 -水溶性ケイ酸およびコロイド状ケイ酸の挙動 と き裂内の流動 -

    連携重点 放射性廃棄物処分安全研究のためのネットワーク第6回情報交換会 2009/03/17

  174. Adsorption and Elution Behavior of Cesium and Rubidium on Ammonium Tungstophosphate (AWP)-CaALG Alginate Microcapsules International-presentation

    Yan Wu, Chuanpin Lee, Hitoshi Mimura, Yuichi Niibori, Isao Yamagishi, Shinichi Koyama, Masaki Ozawa

    Waste Management 2009 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management 2009) 2009/03/01

  175. Selective separation of Cs by ammonium molybdophosphate-loaded silica gels International-presentation

    Yusuke Endo, Wu Yan, Hitoshi Mimura, Yuichi Niibori, Isao Yamagishi, Shinichi Koyama, Masaki Ozawa

    Waste Management 2009 (HLW, TRU, LLW/ILW, Mixed, Hazardous Wastes & Environmental Management) 2009/03/01

  176. Dependence of the Dynamic Behavior of Supersaturated Silicic Acid on the Surface Area of the Solid Phase International-presentation

    Yuichi Niibori, Yasunori Kasuga, Hiroshi Kokubun, Kazuki Iijima, Hitoshi Mimura

    Scientific Basis for Nuclear Waste Management XXXII 2008/12/01

  177. 3D Random Walk Simulation of Magration Behavior of Radionuclide in a Granite Core International-presentation

    Yoshimi Seida, Hiroyasu Takase, Hiroaki Takahashi, Yuichi Niibori

    Scientific Basis for Nuclear Waste Management XXXII 2008/12/01

  178. Evaluation of Radionuclide Transport in Rock Matrix with Heterogeneous Distribution of Retardation Coefficient International-presentation

    Yuichi NIIBORI, Hirofumi FUTAMATA, Hitoshi MIMURA

    16th Pacific Basin Nuclear Conference (16PBNC 2008/10/13

  179. Sorption Behavior of Europium on Calcium Silicate Hydrates International-presentation

    Yuichi NIIBORI, Masayuki NARITA, Junichi KADOWAKI, Hiroaki YOSHIKAWA, Akira KIRISHIMA, Hitoshi MIMURA

    16th Pacific Basin Nuclear Conference 2008/10/13

  180. Deposition Rates of Colloidal Silicic Acid onto the Surface of Silicate Mineral International-presentation

    Hiroshi Kokubun, Yuichi Niibori, Kazuki Iijima, Hitoshi Mimura

    16th Pacific Basin Nuclear Conference (16PBNC) 2008/10/13

  181. Preparation of Ferrocyanide Molybdate and Their Selective Uptake Properties for Palladium and Cesium Ions International-presentation

    Ayumi ASAKURA, Yusuke ENDO, Yan WU, Kaoru IKEDA, Hitoshi MIMURA, Yuichi NIIBORI, Shin-ichi KOYAMA, Masaki OZAWA

    16th Pacific Basin Nuclear Conference (16PBNC) 2008/10/13

  182. Uptake of Strontium (II) in Concentrated Nitric Acid by Microcapsules Enclosed with Decyl-18-Crown-6 International-presentation

    Takahiro TACHIBANA, Yan WU, Chuan-Pin LEE, Hitoshi MIMURA, Yuichi NIIBORI, Yoshito WAKUI, Masayoshi KAMIYA

    16th Pacific Basin Nuclear Conference (16PBNC) 2008/10/13

  183. Selective Uptake of Manganese in Seawater by Hybrid Microcapsules International-presentation

    Takenori KUZUMAKI, Wu YAN, Hitoshi MIMURA, Yuichi NIIBORI

    16th Pacific Basin Nuclear Conference 2008/10/13

  184. Permeability Change with Dissolution and Precipitation Reaction induced by Highly Alkaline Plume in Packed Bed with Amorphous Silica Particles International-presentation

    Kyo Komatsu, Hideo Usui, Junichi Kadowaki, Yuichi Niibori, Hitoshi Mimura

    16th Pacific Basin Nuclear Conference (16PBNC) 2008/10/13

  185. Selective Uptake of Re(VII) by Amine Microcapsules International-presentation

    Yan WU, Hitoshi MIMURA, Yuichi NIIBORI

    16th Pacific Basin Nuclear Conference (16PBNC) 2008/10/13

  186. The educational activities of atomic partnership in Tohoku University since 2005 International-presentation

    Mitsuhiro Fujiwara, Tadao Mogami, Yuichi Niibori, Akira Hasegawa, Hiromichi Yamazaki, Keizo Ishii

    16th Pacific Basin Nuclear Conference (16PBNC) 2008/10/13

  187. Selective Separation of Nuclide by Hybrid Microcapsules(1) Separation of Rear Metals(Re, Mo) International-presentation

    Yan Wu, Ikeda Kaoru, Chuanpin Lee, Hitoshi Mimura, Yuichi Niibori

    OECD/NEA Tenth information exchange meeting on actinide and fission product partitioning and transmutation 2008/10/06

  188. Selective Separation of Nuclide by Hybrid Microcapsules(2) Separation of Heat-generation nuclids (Cs, Sr) International-presentation

    Yusuke Endo, Takahiro Tachibana, Wu Yan, Lee Chuanpin, Hitoshi Mimura

    OECD/NEA Tenth information exchange meeting on actinide and fission product partitioning and transmutation 2008/10/06

  189. 地下水が流動する地層における地中熱利用システムのシミュレータ-地下水流動と温度応答,見かけ熱伝導率との関係-

    森谷祐一, 山田貴大, 浅沼宏, 新妻弘明, 新堀雄一

    日本地熱学会学術講演会講演要旨集 2008

  190. Thermal effect of high burn-up of UO2 and MOX fuels on the disposal system of hulls and end pieces waste

    Hirano Fumio, Nagasaki Shinya, Niibori Yuichi, Sato Seichi, Kozaki Tamotsu, Inagaki Yaohiro, Iwasaki Tomohiko, Ohe Toshiaki, Kato Kazuyuki, Kitayama Kazumi, Torikai Seishi

    Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan 2008

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    高燃焼度UO&lt;SUB&gt;2&lt;/SUB&gt;燃料とMOX燃料の再処理により発生するハル・エンドピース廃棄体を地層処分した後の坑道と周辺岩盤の温度分布を二次元熱伝導解析により計算し、現状の処分システムに及ぼす熱影響を評価した。

  191. Tohoku University’s Activities on Nuclear Engineering and the Related Researches International-presentation

    Keizo Ishii, Akira Hasegawa

    East-South Asia-Japan Symposium of Nuclear Energy Industry and the Related Researches 2007/11/19

  192. 放射性廃棄物処分の概要と処分研究の取り組み

    東北原子力シンポジウム 2007/10/23

  193. 地熱型再生可能エネルギー利用の実用化研究

    伊藤高敏, 新堀雄一

    伝熱 2007/07

  194. Identification of the water-conducting features using Fluid Electric Conductivity Logging

    MATSUOKA Kiyoyuki, TAKEUCHI Shinji, NIIBORI Yuichi

    2007/05/28

  195. ICONE15-10458 UPTAKE BEHAVIOR OF PLUTONIUM (IV) ON CALCIUM ALGINATE GEL POLYMER AND TBP MICROCAPSULE

    Wu Yan, Mimura Hitoshi, Niibori Yuichi

    Proceedings of the ... International Conference on Nuclear Engineering. Book of abstracts : ICONE 2007/04/22

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    The uptake behavior of Pu (IV) has been investigated by using calcium alginate gel polymer (CaALG) and TBP microcapsules (TBP-CaALG). The characterization of CaALG and TBP-CaALG was examined by SEM and IR, and the uptake properties and distribution of Pu(IV) ions were estimated by batch method. The uptake rate of Pu(IV) on CaALG and TBP-CaALG in the presence of 5 M HNO_3 was attained within 6 and 4 h, respectively, and K_d values for CaALG and TBP-CaALG after 7 h-shaking were 50.2 and 53.2 cm^3/g, respectively. Relatively large K_d values (90.3〜425 cm^3/g) were obtained for fresh CaALG and TBP-CaALG in the presence of 0.5〜2 M HNO_3. As for CaALG contacted with 3〜7 M HNO_3, the K_d value considerably decreased with increasing HNO_3 concentration, indicating the uptake of Pu(IV) was governed by ion-exchange reaction. In the presence of 5 M HNO_3, CaALG had relatively large K_d values around 50 cm^3/g up to 7 h, while the long time contact resulted in a considerable lowering of K_d. In contrast, large K_d values above 50 cm^3/g for TBP-CaALG were kept up to 233 h. Thus CaALG and TBP-CaALG are effective for the separation of Pu(IV) in the presence of highly concentrated HNO_3.

  196. 110 Numerical Simulation of non-Fickian Diffusion in a Fractured Porous Aquifer

    CHIBA Ryuichi, FOMIN Sergei, CHUGUNOV Vladimir, NIIBORI Yuichi, HASHIDA Toshiyuki

    2007/03/13

  197. 195 Numerical simulation of CO_2 injection for CO_2 geological sequestration

    Sasaki Kenta, Fujii Takashi, Niibori Yuichi, Ito Takatoshi, Hashida Toshiyuki

    2007/03/13

  198. Immmobilization of Cesium and Strontium by using inorganic materials

    H. Mimura, S. Iino, Y. Niibori, M. Ozawa

    Proc. of Engineering Conferences International,Alternative Materials for Radioactive Waste Stabilization 2007

  199. Dynamic Behavior of Colloidal Silicic Acid around the Geological Repository, and its Impacts on the Migration of Radionuclides International-presentation

    Cup Subgroup Meeting CR-06-4-4 at Tohoku University 2006/12/19

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    日韓セミナー

  200. Preparation of microcapsules enclosing TBP and their uptake properties of metal ions International-presentation

    Yan Wu, Mohammad Otokesh, Hitoshi Mimura, Yuichi Niibori, Kouichi Tanaka

    15th Pacific Basin Nuclear Conference 2006/10/15

  201. Preliminary study on selective separation of soft metal ions from HLLW by using alginate microcapsules enclosing Cyanex 302 extractant International-presentation

    Mohammad Otokesh, Yan Wu, Hitoshi Mimura, Yuichi Niibori, Kouichi Tanaka

    15th Pacific Basin Nuclear Conference 2006/10/15

  202. Chemical interaction between amorphous silica mineral and highly alkaline plume with Ca ion International-presentation

    H. USUI, Y. NIIBORI, J. KADOWAKI, K. TANAKA, O. TOCHIYAMA, H. MIMURA

    15th Pacific Basin Nuclear Conference 2006/10/15

  203. A model to describe permeability change with dissolution processes International-presentation

    Seminar of UCB Department of Nuclear Enegineering (NE298-2) 2006/10/11

  204. Fundamental Study on Fluid Flow and Mass Transport through Unsaturated Geologic Formation. International-presentation

    UCB Nuclear engineering Colloquium 2006/10/02

  205. 断裂型岩体を対象としたCO_2地中圧入の数値シミュレーションに関する研究

    佐々木 健太, 藤井 孝志, 新堀 雄一, 橋田 俊之

    春季大会講演集. I, 資源編 2006/03/27

  206. 121 Numerical Simulation of Flow Dynamics for CO_2 Injection into Rock Masses

    SASAKI Kenta, FUJII Takashi, NIIBORI Yuichi, HASHIDA Toshiyuki

    2006/03/14

  207. Detailed kinetics studies of heavy metal uptake by alginate microcapsules comprising ion exchange matrix and selective extractant

    Aghamohammad Outokesh, Hitoshi Mimura, Yuichi Niibori

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY 2006/03

  208. セメント系材料が及ぼす処分場岩盤への影響評価に関わる技術開発

    前川一彦, 塚本勝男, 新堀雄一, 佐藤努, 由井三和

    経済産業省 「革新的実用原子力技術開発費補助事業」 平成17年度成果報告書 2006

  209. 研究開発の現場から

    NPO法人地中熱利用促進協会主催 地中熱利用ヒートポンプシンポジウム 2005/12/20

  210. 固相存在下におけるポリケイ酸の挙動について

    新堀雄一

    セミナー アクチノイドの化学 ―基礎と応用― 2005/10/17

  211. Influence of colloidal silicic acid on the sorption behavior of europium International-presentation

    Yuichi NIIBORI

    Interface Mineralogy 2005/09/28

  212. 地中熱利用HPシステムの設計と地下水流動について -星野リゾートサイトにおける400m同軸管による採熱試験の解析を中心にして

    財団法人ヒートポンプ・蓄熱センター 地下熱利用とヒートポンプシステム研究会 2005/09/05

  213. 処分場周辺岩盤や人工バリア材の変質評価のための位相シフト干渉計の開発

    上田真三, 上田晃, 加藤耕一, 塚本勝男, 佐藤久夫, 新堀雄一, 佐藤努, 油井三和, 笹本広

    日本原子力学会春の年会要旨集 2005/03/11

  214. 国内での実践例、研究開発の現場から

    一般向けオープンシンポジウム「地中熱利用ヒートポンプシンポジウム-足元のエネルギーを上手に使って快適なくらし!-」 2005/02/21

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    場所 ソニックシティビル31Fテプコ館 主催 NPO法人 地中熱利用促進協会

  215. Geophysical Impacts of Alkaline Groundwater: Rock Alteration Induced Variations in Permeability International-presentation

    International Symposium NUCEF(Nuclear fuel Cycle safety Engineering research Facility) 2005 2005/02/09

  216. Utilization of Underground Heat and Water Flow International-presentation

    The 7th SEGJ (Society of Exploration Geophysicists of Japan) International Symposium 2004/11/24

  217. 安全評価におけるバリア性能研究 Invited

    日本原子力研究所主催 NUCEFセミナー 2004/02/20

  218. アクチノイドと自然界の錯生成物質との相互作用

    栃山修, 新堀雄一, 桐島陽, 千田太詩, 名後利英, 北野博之, 三頭聡明, 原光雄, 鈴木吉光

    東北大学金属材料研究所附属量子エネルギー材料科学国際研究センター共同利用研究経過報告書 2004

  219. Caイオン共存下におけるコロイド状ケイ酸および水溶性ケイ酸の動的挙動

    千田太詩, 新堀雄一, 栃山修, 三村均, 田中紘一

    日本原子力学会春の年会要旨集 2004

  220. 発電だけ?地下の熱の新たな使い方 Invited

    自然エネルギーフォーラムミニチュートリアル講演 2003/11/23

  221. 地熱の商品性 Invited

    日本地熱学会 2003/11/23

  222. 放射性廃棄物の発生予測と準備状況,問題点 Invited

    日本原子力学会 再処理・リサイクル部会 再処理リサイクルセミナー 2003/10/29

  223. 地下水の熱移動を考慮した地中熱利用ヒートポンプの設計と実践 Invited

    日本学術会議 水力学・水理学専門委員会,水資源学専門委員会主催 水環境シンポジウム -21世紀の研究課題と展望 2003/08/05

  224. 錯生成に及ぼすフミン酸の不均一性の影響

    TOCHIYAMA OSAMU, NIIBORI YUICHI, TANAKA KOICHI, KUBOTA TAKUMI, YOSHINO HIROFUMI, KIRISHIMA AKIRA, SETIAWAN B

    日本原子力学会春の年会要旨集 2003/03/05

  225. 固相共存下のコロイド状および水溶性のケイ酸の挙動

    千田太詩, 新堀雄一, とち山修, 田中紘一

    日本原子力学会春の年会要旨集 2003

  226. 水-水蒸気二相流におけるトレーサー応答の解析

    日本地熱学会(貯留層に関する小集会) 2002/11/20

  227. エネルギ-情勢とプルサ-マルについて

    新堀雄一

    コミュニケーションシリーズ ひろば 2002/08/20

  228. 浅部地熱利用の促進について:そのエネルギーフローにおける位置づけ

    地熱エネルギー講演会 2002/07/03

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    東北経済産業局内東北地熱資源開発促進連絡協議会主催

  229. Geothermal Heat Pump System Demonstration test considered underground water : Part1 Load experiment in winter

    IWATA Yoshimi, MORI Fukashi, FUKAYA Genzaburou, NIIBORI Yuichi

    Summaries of technical papers of Annual Meeting Architectural Institute of Japan. D-2, Environmental engineering II, Heat, moisture, thermal comfort, natural energy, air flow, ventilation, smoke exhaustion, computational fluid dynamics, indoor air quality heating, cooling and air-conditioning heat and cold sources, piping systems application of building services 2002/06/30

  230. エネルギー情勢とプルサーマルについて

    山形地区エネルギー懇談会記念講演会 2002/05/28

  231. 地下不均質媒体における移動現象について -高レベル放射性廃棄物地層処分の安全評価に関連して

    日本伝熱学会東北支部 2002/04/25

  232. 東北地方における浅部地熱利用の促進について

    東北地熱資源開発促進連絡協議会 2001/10/17

  233. 出前授業「放射線の検出・霧箱の製作」

    第18回物理教育研究大会(分科会 これからの理科教育の果たす役割) 2001/08/11

  234. 地中熱利用ヒートポンプ(GeoHP)の開発

    第17回産学官交流のつどい(分科会 環境問題への取り組み) 2001/07/05

  235. 米国おける高レベル廃棄物処分場設計概念の変化とニアフィールドバリアの性能評価研究

    産業創造研究所原子力高度技術研究会(バックエンド技術) 2001/02/16

  236. Understanding of subsurface heterogeneity using the moments of distribution International-presentation

    Seminar of UCB Department of Nuclear Enegineering (NE298-2) 2001/01/24

  237. 固相表面に析出したシリカのモノマー化速度

    千田太詩, 新堀雄一, 栃山修, 田中紘一

    日本原子力学会秋の大会予稿集 2001

  238. 1-4. 出前授業「放射線の検出・霧箱の製作」((第1分科会)これからの理科教育(特に物理教育)の果たす役割,分科会,第18回物理教育研究大会(仙台大会)の報告)

    新堀 雄一

    物理教育 2001

  239. スイスにおけるGeoHPの普及と今後の研究課題

    地中熱利用ヒートポンプ協会 2000/10/18

  240. Safty Assessment of Geological Disposal System International-presentation

    International Workshop - H12 reports to Establish the Scientific and Technical Basis for HLW Disposal in Japan - 2000/08/08

  241. カルシウム共存下におけるフミン酸とユウロピウムの相互作用

    KUBOTA TAKUMI, TOCHIYAMA OSAMU, TANAKA KOICHI, NIIBORI YUICHI

    日本原子力学会春の年会要旨集 2000/03/28

  242. Estimation of Mass Transport in Reservoir Using a Network Model

    HAGA D., NIIBORI Y., CHIDA T.

    1999/12/01

  243. A model of local distribution of liquid saturation in fractured rocks and its application International-presentation

    Institute fur Geophyski ETH Zurich Kolloquium 1999/11/05

  244. フミン酸とNp(V)の相互作用

    YOSHINO HIROFUMI, KUBOTA TAKUMI, TOCHIYAMA OSAMU, NIIBORI YUICHI, TANAKA KOICHI, MITSUGASHIRA TOSHIAKI

    日本原子力学会春の年会要旨集 1999/03/22

  245. ポリアクリル酸とユウロピウム(III)の相互作用

    KUBOTA TAKUMI, TOCHIYAMA OSAMU, TANAKA KOICHI, NIIBORI YUICHI

    日本原子力学会春の年会要旨集 1999/03/22

  246. Interaction of actinoids with geologic constituents and with components dissolved in groundwater.

    TOCHIYAMA OSAMU, NIIBORI YUICHI, SATO MITSUYOSHI, TANAKA KOICHI, KUBOTA TAKUMI, YOSHINO HIROFUMI, KASUGA YASUNOBU, SANTO TOSHIAKI, SUZUKI YOSHIMITSU

    共同利用研究経過報告書 1999/03

  247. Effects of Microscopic Heterogeneity of Saturation on Mass Transport in Liquid-Gas Steady Flow

    HAGA D., NIIBORI Y., CHIDA T.

    1999/01/25

  248. Identification of Mass Transport through Unsaturated Flow Using TFL Model

    HAGA D., NIIBORI Y., CHIDA T.

    1998/01/25

  249. Estimation of Dispersion Coefficient and Mass Transfer Rate in Unsaturated Flow

    HAGA D., NIIBORI Y., CHIDA T.

    1997/04/25

  250. 地下水流動と高レベル放射性廃棄物の処分について

    資源・素材関連学協会合同秋季大会 1996/10/22

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    資源・素材関係学協会合同秋季大会企画講演論文集(1996)146-149

  251. Acid-base character of organic decomposition products in the stratum.

    SATO NOBUHARU, KUBOTA TAKUMI, TANAKA KOICHI, NIIBORI YUICHI, TOCHIYAMA OSAMU

    資源・素材 1996/10/21

  252. MEORにおける栄養塩とバクテリアの移動現象についての検討

    楊 延国, 新堀 雄一, 井上 千弘, 千田 佶

    資源・素材 1996/10/01

  253. Study on Tracer Injection using a Solute Transport Model Considering Difference in Fluid Density.

    YANG Y., GONAIKAWA M., NIIBORI Y., HONG C., CHIDA T.

    1996/04/25

  254. 鉄酸化細菌の酸化挙動に及ぼす二酸化炭素の影響

    山根 均文, 新堀 雄一, 井上 千弘, 千田 佶

    一般発表(研究・業績発表)講演要旨集 1996/03/29

  255. Oxidating behavior of Thiobacillus ferrooxidans under the existence of solid.

    川辺能成, 井上千弘, 新堀雄一, 千田ただし

    資源・素材学会研究・業績発表講演会講演要旨集 1996/03

  256. WGC'95 スロバキア/ポーランド巡見 (5/16-5/20)

    新堀 雄一

    日本地熱学会誌 1996/01/25

  257. Groundwater Flow Analysis Considered a Topography in Detail.

    HAGIHARA S, NIIBORI Y, CHIDA T

    1995/04/25

  258. 鉄酸化細菌の酸化挙動に及ぼすFe^<3+>イオンの影響

    小野田 道広, 須藤 孝一, 新堀 雄一, 千田 佶

    一般発表(研究・業績発表)講演要旨集 1995/03/28

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Industrial Property Rights 1

  1. 地中熱利用ヒートポンプの構造

    森不可止, 岩田宜己, 馬場基次, 伊藤幸広, 殷耀晨, 新堀雄一

    Property Type: Patent

Research Projects 38

  1. 処分環境においてケイ酸の再分配による核種固定化機能を発現する長期安定バリアの開発

    千田 太詩, 新堀 雄一, 関 亜美

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(B)

    Institution: 東北大学

    2024/04/01 - 2028/03/31

  2. Development of sequential self-healing cement-based barrier for confining the nuclides in a groundwater saturated field

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Tohoku University

    2021/04 - 2025/03

  3. 放射性廃棄物のさらなる閉じ込めを狙う雲母鉱物の核種固定化メカニズムの新解釈

    千田 太詩, 新堀 雄一

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 挑戦的研究(萌芽)

    Institution: 東北大学

    2021/07 - 2024/03

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    放射性廃棄物処分において,核種を閉じ込めるバリア性能が期待される天然岩盤には,核種収着能に優れた雲母鉱物が含有される.従来,核種と鉱物の相互作用検討には鉱物を粉砕した粉末試料が用いられてきたが,岩盤中の雲母は層状構造を有し,数cm程度の薄片形状で存在する.本研究では,薄片状雲母を用いた実験検討により,粉末試料ではわからなかった核種収着メカニズムを解明し,天然岩盤にさらなる核種閉じ込め性能を見出すことを目指す. 本研究では,検討事項(1):薄片状雲母への陽イオン収着機構解明,および,検討事項(2):薄片状雲母への陽イオン収着に関する数値解析,の2つの検討事項を設定している.初年度は,計画に沿って検討課題(1)の実験体系の整備を進めた.実験では,3 gの薄片状黒雲母(5×6 mm大)とユウロピウム(Eu)溶液 30 mLをポリプロピレン容器に封入し,25℃の恒温振とう機にて振とうした.開始から7日に亘り,1日ごとに溶液を採取してEu濃度を測定し,同濃度および同量の溶液を容器に戻すことにより,溶液条件や液固比が変化しないようにした.さらに,収着実験7日後に固液分離し,固相を0.01 mM硝酸溶液で洗浄した後,0.6 M塩化ナトリウム溶液30 mL添加して脱着実験を行った.その結果,収着実験においてEu濃度が時間経過とともに緩やかに低下した.黒雲母を粉砕した粉末試料の場合には収着実験開始直後にほぼ全てのEuが収着しており,薄片状黒雲母を用いた本研究の結果からはEuが薄片内へ拡散浸入しながら収着すると考えられる.また,脱着実験においては,収着量の1割程度の脱着が実験開始直後に確認されたものの,その後2ヶ月に亘りEu脱着量は増加しなかった.このことから,薄片端部に収着したEuはNaと速やかにイオン交換して溶出するものの,薄片内部に拡散浸入したEuは脱着しづらい状態にあることが示唆される.

  4. Self-sealing Dynamics of Unsaturated Layer for Downsizing of Geological Disposal System

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory)

    Category: Grant-in-Aid for Challenging Research (Exploratory)

    Institution: Tohoku University

    2020/07/30 - 2023/03/31

  5. Self-restoration function of natural barrier confining radionuclides by clogging flow-paths with the redistribution of silicic acid

    Chida Taiji

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2018/04/01 - 2022/03/31

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    Spatial redistribution of silicic acid occurs around a radioactive waste repository, due to dissolution and deposition with the change of pH. This study focused on the self-restoration of the confinement for radionuclides in the host rock caused by the redistribution of silicic acid, especially deposition behavior. The experimental results showed that the deposition rates of silicic acid are on the same order of magnitude under all conditions in this study, i.e., the conditions using amorphous silica and hydrothermally-altered minerals as the solid phase for the deposition of silicic acid and coexisting various multivalent cations in groundwater. Furthermore, the analysis based on the estimated deposition rates suggests that the deposition of silicic acid in the groundwater flow-field can retard the migration of nuclides because of narrowing flow-paths in the host rock.

  6. Development of Cement System Barrier Generating Self-confinement Function of Nuclide in a Saturated Groundwater Flow Field

    Niibori Yuichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Tohoku University

    2017/04/01 - 2020/03/31

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    A cement-based barrier that retards the leakage of nuclides from the underground disposal facility for radioactive waste in a saturated flow-field with groundwater was developed in this study. The experimental data showed that calcium silicate hydrate (hereinafter referred to as the CSH gels) forms as a secondary mineral under a highly alkaline and flow condition, due to the elution of calcium ions from the cement necessary for the construction of the repository and the dissolution of silicic acid from the groundwater flow-paths. Besides it was figured out that the CSH gels lead a confinement function against iodide and iodate ions which is ten times or more than that conventionally assigned, because of both the decrease in the permeability of groundwater associated with the formation of the CSH gels and the chemical reactions. Moreover, the addition of hydrotalcite (HT) as a fine aggregate of cement can further improve their confinement effect under a freshwater groundwater condition.

  7. Proposal of compact geological disposal system utilizing alteration control function of engineered barrier in unsaturated zone

    Niibori Yuichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

    Category: Grant-in-Aid for Challenging Exploratory Research

    Institution: Tohoku University

    2016/04/01 - 2019/03/31

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    This study examined the compactification of the geological disposal system by considering the alteration behavior of the engineered barrier in the unsaturated underground space area not filled with groundwater. As a result, although the unsaturated zone cannot suppress the supply of potassium that causes the illiteration (alteration) of the engineered barrier, it raises the temperature of the backfill area and promotes silica deposition due to cement utilization, improving the water barrier property. This makes it possible to improve the water barrier properties of the engineered barrier and to remove the conventional restriction condition of 100 degrees Celsius or less as the suppression temperature for illitization. Therefore, for example, two waste materials can be stacked to reduce the required area of the disposal site to half of the conventional one.

  8. Challenging research in self-contained buffer-barrier stabilized in long term by expression of improvement functions at different time scale

    Chida Taiji, NIIBORI YUICHI

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

    Category: Grant-in-Aid for Young Scientists (B)

    Institution: Tohoku University

    2016/04/01 - 2018/03/31

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    For the new concept of the buffer-barrier which exhibits the higher performance of nuclide confinement at different time scale, this study examined the deposition behavior of supersaturated silicic acid on clay minerals (bentonite) used for the geological disposal system, and estimated the clogging effect of flow-paths with the deposition of silicic acid. The results of deposition experiments showed that the deposition of supersaturated slicic acid on Na-type bentonite, Ca-type bentonite and amorphous silica significantly progressed under some conditions (pH, temperature, salt concentration) of the underground environment. In the estimation of the clogging effect considering the apparent deposition rate constants, the calculation results suggested that flow-paths and porous media for the migration of radionuclides around the repository will be sufficiently clogged by the deposition of silicic acid within 1,000 years assuming as the period guaranteed the performance of waste container.

  9. Development of nuclide confinement cement barrier undergoing a self-repair function under a condition saturated with groundwater

    Niibori Yuichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Tohoku University

    2013/04/01 - 2017/03/31

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    In consideration of embedding radioactive waste in the subsurface where the liquid-solid ratio is small and saturated by groundwater, the confinement function of calcium silicate hydrate (hereinafter referred to as CSH) was examined by using mainly iodide ions. While CSH is the main component of cement, it is known that Ca gradually leaches due to alteration. However, even if the Ca/Si molar ratio 1.6 of ordinary cement decreases to 0.4, the results in this study showed that the CSH confines iodine undergoing a form dissolved in the hydration water. Furthermore, such a confinement function also appeared in the flow field of groundwater. This means that in a geological disposal system CSH itself repairs the barrier damaged by crustal deformation and so on.

  10. Compactification of geological disposal system based on dynamics of groundwater saturation processes

    Niibori Yuichi, CHIDA TAIJI

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

    Category: Grant-in-Aid for Challenging Exploratory Research

    Institution: Tohoku University

    2013/04/01 - 2016/03/31

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    This study examined the groundwater saturation processes,in order to compact the geological disposal system, by using the micro-flow cell and the packed bed. Here, high alkaline groundwater due to cement utilization was also considered. As the result, the saturation processes depended on not the mass transfer rate of gas component from gas phase to liquid phase but the diffusion of dissolved gas in groundwater and/or the mixing of the groundwater itself. Besides, considering the permeability distribution due to residual gas, this study calculated the underground area required for the disposal of vitrified radioactive waste, by using a numerical model. The results suggested a compacted case 10% smaller than the area of the present design. Furthermore, the future issues were also discussed.

  11. Basic Studies for Developing Rational Treatment and Disposal System of Radioactive Wastes Generated by Fukushima Dai-ichi Nuclear Reactor Accident

    Ikeda Yasuhisa, MIMURA Hitoshi, SATOH Nobuaki, NIIBORI Yuichi, KOZAKI Tamotsu, SATOH Tsutomu, SASAKI Takayuki, KIRISHIMA Akira, IDEMITSU Kazuya, INAGAKI Yaohiro, SUZUKI Tatsuya, TAKESHITA Kenji

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)

    Category: Grant-in-Aid for Scientific Research (S)

    Institution: Tokyo Institute of Technology

    2012/05/31 - 2016/03/31

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    Basic research for constructing rational treatment and disposal system of radioactive wastes generated by Fukushima Dai-ichi nuclear accident have been performed in three research fields of characteristic of solid and liquid contaminants, treatments of solid and liquid contaminants, and radioactive waste disposal. As a result, we have obtained many useful data on properties of fuel debris, leaching behavior of nuclides from debris, treatment methods of contaminated water, solidification method of wastes, novel decontamination methods, migration behavior of nuclides in the fields containing salts of high concentrations, and so on. These results are expected to contribute to the management plan of radioactive wastes generated under abnormal conditions in contact with water containing seawater in the Fukushima Dai-ichi nuclear accident, and to the progress of radioactive waste managements.

  12. Robust neutron source for resource exploration

    KITAJIMA Sumio, SASAO Mamiko, OKAMOTO Atsushi, WADA Motoi, NIIBORI Yuichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

    Category: Grant-in-Aid for Challenging Exploratory Research

    Institution: Tohoku University

    2011 - 2012

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    A robust electron stripper for H- to H+ using a metal surface was developed for a compact tandem-type DD or DT neutron generator of next generation. The experimental results showed that the conversion efficiency, H+ fraction in the reflected particles, improved by surface polish up to the maximum value of about 90%. Roughness parameters were measured for 2 samples of metal surface, polished and non-polished, using a 3D laser-scanning microscope. The surface measurement indicated that there was factor 4 improvement in the average roughness by polish.

  13. Maximum use of the radioactive waste disposal system based on the non-linear dynamics of unsaturated zone

    NIIBORI Yuichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

    Category: Grant-in-Aid for Challenging Exploratory Research

    Institution: Tohoku University

    2010 - 2012

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    The over-all mass transfer coefficients between liquid phase and gas phase in the presence of solid phase were evaluated in order to propose a more reliable space use for the geological disposal system of radioactive wastes. These mass transfer coefficients were consistent with Ranz-Marshall formula, describing the dynamic behavior of dissolved gases.

  14. Development of cementitious safety barrier inducing a self-feedback function of nuclide enclosure

    NIIBORI Yuichi, KIRISHIMA Akira, MIMURA Hitoshi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2009 - 2012

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    Interaction of iodine ions(I^-,IO_3^-) with altered Calcium Silicate Hydrate (CSH) was examined, by considering the condition saturated with groundwater. The results showed that CSH altered from 1.6 to at least 0.4 in Ca/Si molar ratio underwent the retardation effect for iodine ions, after backfilling the repository system of radioactive wastes.

  15. DEVELOPMENT OF PRECISE SEPARATION METHOD OF RADIOACTIVE NUCLIDES BY HYBRID MICROCAPSULES

    MIMURA Hitoshi, WAKUI Yoshito, HAYASHI Hiromichi, SATO Nobuaki, KOYAMA Shinichi, NIIBORI Yuichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2008 - 2012

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    Nuclide separation properties by highly functional microcapsules were evaluated and compact precise separation process was developed. Microcapsules enclosing AMP, crown compound, insoluble ferrocyanides and extractants (MIDOA, TOA and LIX) were effective for the separation of Cs, Sr, Pd,Tc, Re, and Mo, respectively, and applicability to simulated and real wastes was confirmed.

  16. AMPマイクロカプセル内包モルデナイトによるCsの選択的分離・固化

    三村 均, 新堀 雄一, 林 拓道, 和久井 善人, 小山 真一

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 挑戦的萌芽研究

    Category: 挑戦的萌芽研究

    Institution: 東北大学

    2008 - 2010

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    モルデナイトにAMPを担持するため、リンモリブデン酸と硝酸アンモニウム溶液を減圧下でモルデナイトのマクロポアに含浸させ、AMPをモルデナイト内部で合成析出させた。溶液の含浸工程を1~3回繰り返して、AMP-M1およびAMP-M2,AMP-M3を得た。 HLLWを模擬した模擬高レベル放射性廃液(SW-11)を用いた実験を行ったところ、AMP-M3へのCs^+の吸着率が80%に達成した。硝酸濃度が約2M、ナトリウム濃度が約1Mである上に、種々の元素を多量に含む模擬高レベル放射性廃液から、高いCs^+の吸着率を示したことにより、AMP-M3の高いCs^+選択性が実証された。 バッチ実験によってAMP-M吸着剤の基礎的なCs^+の吸着特性を調べたが、AMP-M吸着剤をより現実的な処理方法であるカラム法に適用した際の性能を評価するためにカラム実験を実施した。カラム(f5mm×20mm)に2.0gのAMP-M3吸着剤を充填したAMP-M3カラムの破過実験を行い、その破過特性を調べた。破過曲線はなだらかなS字曲線となり、破過容量が0.081mmol/g、全交換容量が0.22mmol/gであると算出された。AMP-M3カラムの全交換容量はバッチ実験によって求められたAMP-M3のCs^+飽和吸着量の40%程であり、この吸着量の差は、二つの実験系における固相と液相の接触時間の違いであると考えられることからフィード溶液の流速の最適化を行うことにより、より高い全交換容量を得られると考えられる。吸着実験後のAMP-M3カラムに溶離剤として高濃度の硝酸アンモニウム溶液を通液することにより、カラムに吸着されたCs^+の95.4%を溶離することができた。

  17. Selective separation and recovery of palladium by hybrid microcapsules

    MIMURA Hitoshi, NIIBORI Yuichi, SATO Nobuaki, HAYASHI Hiromichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2005 - 2007

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    In the high-level liquid wastes (HLLWs) generated from reprocessing process of spent nuclear, various useful elements are contained. At present, HLLWs were mixed with glass granules and melted by Joule heating. The glass products are covered with multi-barrier and then disposed in a deep geological site. Palladium tends to precipitate during melting process and to hinder the vitrification. The separation and recovery of Pd, a kind of rear metals, are thus effective for the advancement of waste treatment and enables its utilization. Further, the development of separation and recovery method becomes very important from the standpoint of "element strategy". The present paper deals with the preparation of insoluble ferrocyanides with high selectivity towards Pd^<2+> and the advancement of separation and recovery methods. The results of this study are as follows: (1) KCuFC shows relatively high uptake kinetics (uptake equilibrium within 10 min and 99.9% uptake), and the order of Pd^<2+> uptake is KCuFC > KNiFC > KCoFC. The adsorption of Pd^<2+> on ferrocyanides is very specific due to ion-exchange/oxidation and reduction. The uptake of Pd^<2+> is over 90% in the presence of 0.3-7 M HNO_3. After adsorption, the ferrocyanide was thermally decomposed and treated with acid, and then PdO with high purity was recovered as insoluble residue. (2) The fine ferrocyanides were granulated by the microencapsulation with alginate gel matrices for the column adsorption. The breakthrough capacity of Pd^<2+> ions was estimated to be 0.031 mmol/g and 92% of Pd can be eluted with thiourea. (3) The alginate films with different thicknesses enclosing KZnFC were prepared by supporting with filter paper. The Pd^<2+> ions were selectively adsorbed on the alginate film. Thus the alginate film enclosing insoluble ferrocyanides are expected for the selective separation and concentration of Pd^<2+> as an ion-exchange filter and a liquid membrane.

  18. 高レベル廃棄物の高機能性ナノ吸着剤への変換

    三村 均, 新堀 雄一

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 萌芽研究

    Category: 萌芽研究

    Institution: 東北大学

    2005 - 2006

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    本研究では、Mo、Cs^+およびPd^<2+>に注目し、MoをCs^+およびPd^<2+>に対する高吸着性・高選択性吸着剤に変換し、資源の有効利用を図るための基礎研究を行った。吸着剤として、容易に調製でき、Cs^+およびPd^<2+>に対して高吸着性・高選択性を示す不溶性フェロシアン化物を選択し、Cs^+およびPd^<2+>に対する吸着特性を評価するとともに、28成分系の模擬高レベル廃液からのCs^+およびPd^<2+>に対する高吸着性・高選択性を確認した。また今後のカラム実験に際して取り扱いを容易にするために、アルギネートマイクロカプセル(ALG-MC)による賦形化を行い、Cs^+およびPd^<2+>に対する吸着特性を評価した。以下にその成果の概要を記す。 (1)前年度の成果でCsとPdに吸着性の高いフェロシアン化物FeMo-3を用いて、模擬高レベル廃液(SW-11)からのCs^+およびPd^<2+>に対する吸着速度を調べた。SW-11には硝酸濃度が2.5M、Na^+が約1Mと高濃度で含まれ、さらに様々な核種が含まれているが、FeMo-3はCs^+およびPd^<2+>に対して高い吸着率(90-100%)を示した。このことから、実廃液からもCs^+およびPd^<2+>に対する高吸着性を期待できる。 (2)調製したFeMoとアルギン酸ナトリウム溶液を混練し、硝酸カルシウム溶液中に滴下することで容易にALG-MCを調製した。SEM観察によりFeMo-MCの直径は約1mmで、表面に数多くの皴が確認できた。内部のSEM観察やEPMA分析によって吸着されたCs^+およびPd^<2+>の分布を調べ、均一に包括固定されていること、1時間程度で吸着平衡に達すること、粉末状フェロシアン化物と同程度の吸着率が得られることを確認した。 (3)アルギネートゲルによる粉末状のFeMoのマイクロカプセル化を図ったが、高硝酸濃度下でのFeMoの溶出を抑制するという付随効果が得られた。

  19. Establishment of design methodology of integrated renewable energy systems and its demonstrative test.

    NIITSUMA Hiroaki, ASANUMA Hiroshi, NAKATA Toshihiko, NIIBORI Yuichi, TSUCHIYA Noriyoshi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Tohoku University

    2003 - 2005

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    This research was carried out to establish a design methodology of integrated renewable energy systems and to demonstrate/evaluate its performance throughout experimental study. Major results from this project are as follows : 1. Medeling (1), We have coded integrated RE systems which include Geo-HP, PV, wind turbine and made it possible to evaluate its transient performance and cost/environmental effect. 2. Evaluation of response of the Geo-HP system (1), The performance of Geo-HP system with water storage was evaluated by a simulation code. (2), The flow of water and heat in the permeable formation was modeled by means of FEM. 3. Investigation of the model (1), Optimum system and its performance was evaluated to some model field in Tohoku area. (2), Predictive model using previous information on demand/supply. 4. Data collection and simulation at model fields. (1), Three model fields were selected in Tohoku area and renewable energy systems were designed to each site. (2), Historical change of the energy systems were made at a village. (3), FS on introduction of the RE systems to a new campus of Tohoku University was made. 5. Demonstrative study (1), A model system of PV, wind turbine and Geo-HP was build in Tohoku University and its performance and operating style was experimentally investigated. (2), A system with a micro-hydro and Geo-HP at Higashi-Hachimantai field was designed and its performance was evaluated by simulation.

  20. Determination of thermodynamic quantities of the complex formation of actinoids by microcalorimetry

    TOCHIYAMA Osamu, NIIBORI Yuichi, TANAKA Koichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Tohoku University

    2002 - 2005

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    Potentiometric and microcalorimetric titration techniques were applied to determine the Gibbs free energies and enthalpies of the protonation and Eu(III), U(VI) complexation of formic, acetic, glycolic, oxalic, malonic and malic acids in 1.0 M NaClO_4 solution at 25℃, where Eu(III) was used as a chemical analog of radiologically important Am(III). By using the values of ΔG determined by potentiometric titrations, the results of calorimetric titrations were analyzed to give the values of ΔH and ΔS. To support the discussion on the obtained thermodynamic quantities, the hydration numbers of Eu(III) in the complexes were obtained by TRLFS measurement, where the luminescence lifetime of Eu(III) excited by 394nm laser was measured. In the reaction with these carboxylates, proton, Eu^<3+> and UO_2^<2+> showed the typical hard Lewis acid character, and the enthalpies of the reactions were very small or slightly positive, indicating that the protonation or the complexation of these carboxylates were entropy-driven, that is, |-TΔS|>>|ΔH| in ΔG=ΔH-TΔS. The result of TRLFS measurement revealed that the dehydration occurred not only in the cation but also in the ligand anion. The numbers of hydrated water liberated in complexation were found to be controlled by the geometrical conditions such as denticity (mono- or bidentate coordination of the ligand), bulkiness or hydrophilicity/hydrophobicity of the ligand, dioxo-structure of UO_2^<2+>, and congestion of the ligands around the cation (stepwise complex formation).

  21. 多元機能マイクロカプセルの合成と放射性核種の一括除去

    三村 均, 新堀 雄一, 佐藤 修彰

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 萌芽研究

    Category: 萌芽研究

    Institution: 東北大学

    2003 - 2004

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    事故廃液からの迅速な核種除染のために、多元機能を有するマイクロカプセルの合成と放射性核種の一括除去に関する基礎研究を実施し以下の成果を得た。 1 核種選択性を有する微小な無機イオン交換体粉末および油状の抽出剤は,積層重合したポーラスなCaALGゲルポリマー内に包括固定でき,種々の形態(粒状,柱状,繊維状および膜状)のマイクロカプセルが調製可能であった。 2 吸着速度および分配係数(K_d)を測定した結果,Cs,Y,EuおよびAmの吸着は速く,1日で平衡に達し,90%以上の高い吸着率が得られた。SrおよびCo吸着率は40および10%であった。CuFC/clinoptilolite/DEHPA/CaALGマイクロカプセルを用いた場合,10^<-2>MHNO_3共存下でのK_d値は,Cs:1.1x10^4,Sr:7.5x10,Co:1.1x10,Y:1.0x10^4,Eu:1.4x10^4およびAm:3.4x10^3cm^3/gであった。 3 マイクロカプセル断面のEDSスペクトル分析から,CuFCおよびclinoptiloliteにCs^+,DEHPAにY^<3+>およびEu^<3+>,CaALGにSr^<2+>,Y^<3+>およびEu^<3+>が取り込まれていることが確認された。 4 耐放射線性は,188kGyまでの照射線量では吸着能の変化は認められなかった。 5 今後の課題としては,吸着速度の向上,SrおよびCoの吸着率の向上およびアニオンの吸着に関して検討する必要がある。

  22. Formation of Superaitical Geothermal Resevoirs by Means of Supercritical Water-Induced Cracking

    HASHIDA Toshiyuki, HAYASHI Kazuo, TSUCHIDA Noriyuki, NIIBORI Yuichi, TAKAHASHI Toru

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: Tohoku University

    2002 - 2004

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    The research project determined the feasibility of utilizing the interactions between supercritical water and rock-forming minerals in the creation of an artificial subsurface geothermal reservoir in a deep-seated rock mass, in which temperature and pressure conditions exceed the critical point for water. The main results obtained in this study are summarized below. 1.Application of confining pressures in high temperature testing was shown tot be effective in order to mitigate the thermal stress induced micro-cracking due to thermal expansion mismatch of the rock-forming minerals by conducting ultrasonic wave velocity measurements. 2.Permeability measurements were made for several types of granitic rocks using thick-walled cylindrical specimens. The rock specimens included cores taken from the deep-seated high temperature rock mass at an actual geothermal field site. It has been shown that the permeability measured jumped significantly when the condition of water exceeded the critical point for water regardless of the rock types used in this study. The significant increase in permeability was shown to be due to grain-scale microcracking induced from the interaction between the supercritical water and rock-forming minerals. The extent of the permeability increase was less for the rock specimens taken from the deep-seated rock masses than that for the rock types obtained from outcrops. 3.Tri-axial compression tests were conducted in order to examine the effect of stress on the above-mentioned supercritical water induced cracking phenomenon. It has been demonstrated that the microcrack density at the vicinity of the final fracture plane was signifcantly larger than that at the far-field when the temperature was greater than the critical temperature. The increase in the microcrack density points out that the supercritical water induced cracking was accelerated by the effect of stress. The accelerated cracking is newty named as supercritical water enhanced stress corrosion cracking. The experimental observation may suggest the potential use of the supercritical water enhanced stress corrosion cracking the expansion of hydraulically-induced geothermal reservoirs. 4.We undertook long-term thermal extraction numerical modeling analysis, for a supercritical rock mass, which incorporated fluid flow characteristics (i. e. circulating water) and thermal transfer in the surrounding rock mass. We considered the effects of temperacure and pressure in the supercritical fluid regime, as well as fluid density, viscosity etc. Based on the numerical results, it has been shown that there is an optimum injection rate to extract the heat energy from the supercritical reservoir combined with subcritical temperacure rock mass.

  23. Hybrid System for in-situ Remediation of Contaminated Soil by Chlorinated Organic Compounds

    CHIDA Tadashi, INOUE Chihiro, NIIBORI Yuichi, SUTO Koichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: TOHOKU UNIVERSITY

    2002 - 2004

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    The purpose of this study was to establish the hybrid system combined reductive dechlorination by iron powder and biodegradation with anaerobic microorganisms for the remediation of the soil contaminated with chlorinated organic compounds. Main research results are as follows. 1.On the reductive dechlorination of the chlorinated organic compounds such as TCE by the metallic iron powder, the details of the reaction palhway was clarified by the kinetic analysis. The mixing method of iron powder to the soil to treat the contaminant efficient was developed. 2.The concentration of chlorinated organic compounds in the groundwater drastically decreased in the downstream of the reactive permeable wall, when the wall was installed in the contaminant source area. 3.As a reducing agent except for iron powder, it was detected that thiophene derivatives and elemental sulfur had been formed as reaction product in the pyrite surface, when the utilization of sulfide mineral such as the pyrite was examined. At the same time, no product detected in the vapor phase, though chloride ion was detected in liquid phase. 4.The batch treatment at the anaerobic condition using the enrichment culture system for decomposing TCE was carried out. The dechlorination of TCE to the ethene was observed, when methanol or the EDC was added to culture solution. 5.Iron powder was mixed and filled in the contaminant source area of chlorinated organic compounds, and microbial treatment was applied around the source area where the concentration of the contaminant was relatively lower level. The contaminant was very efficiently removed by this hybrid system in comparison with the case in which each process was independently carried out.

  24. Development of a borehole temperature simulator to optimize operation of high-temperature well drilling

    TAKAHASHI Hiroshi, HATAKEYAMA Nobuo, SUTO Yuko, NIIBORI Yuichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2002 - 2003

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    In this research, a useful borehole simulator was developed to know borehole temperature and to select an optimum drilling condition while, drilling high-temperature formation. In addition, the adaptability of the simulator to high-temperature formation drilling was discussed, compared with field data. A special borehole simulator was developed. Using the simulator, you can simulate borehole condition corresponding to a series of work at drilling site. You can input various drilling parameters to the simulator, and can get the returned mud temperature, the bottomhole temperature, and so on. Some field data were selected to compare with simulated data. The field data were mud logging data, mud circulation test data and temperature recovery test data from a high-temperature oil well and a geothermal well. Results showed that simulated values relatively agreed with measured value from these test. This indicates that you can estimate borehole temperature to a certain extent while high temperature drilling. It was also suggested that properties of non-Newtonian fluid at high temperature was needed to be more clear in order to much accurate the simulator.

  25. 地球環境適応型地熱開発戦略に関する企画調査

    新妻 弘明, 正路 徹也, 松永 烈, 笹田 正克, 新堀 雄一, 高嶋 勲

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 基盤研究(C)

    Category: 基盤研究(C)

    Institution: 東北大学

    2001 - 2001

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    本研究では,エネルギーの供給量のみならず,その質と特性,環境メリット,環境負荷,市場と経済性,地域適応性など多面的観点から21世紀の環境適応型自然エネルギーとしての地熱利用形態のあり方,開発のあり方を調査検討し,今後の学術研究,産官学における研究開発・共同研究,および国際協力のあり方を提言することを目的として実施した。 本研究は研究代表者,分担者ならびに研究協力者からなる計8回の調査検討会(仙台1回(H14年2月)東京7回(H13年,6月,7月,8月,9月,11月,12月およびH14年3月)を中心に行なった。この調査検討会の初めの3回では,1回に2名ほどが各自の調査結果,知見等をとりまとめて報告し,それを中心に討議を行った。その後,以下の点について,各自が意見を持ち寄り,重点的に討議を行った。1) 環境適応型自然エネルギーとしての地熱エネルギーの供給量,質および特性,2) 環境メリットと環境負荷,3) 市場と経済性,4) 地域適応性,5) 国際協力のあり方,6) これまでの研究・開発・調査の実績,データベース等,我が国の知的資産の活用方法,7) これからの地熱利用形態のあり方,開発のあり方,8) 今後の学術研究,産官学における研究開発・共同研究のあり方。 また,本調査会に国内の有識者を招き,情報交換ならびに意見交換を行った。 さらに本研究の中間成果を国内の学識者および施策者に説明し,討論を行うとともに本研究の方針について意見を得た。 本研究の成果は学術誌に公開するとともに,電子ファイルおよび印刷物として国内外の地熱関係者および政府関係者へ配布する予定である。

  26. Optimization of Heat Extraction Performance from Multiple Borehole Reservoir Systems-Towards the Enlargement of Geothermal Reservoirs and Enhancement of Heat Extraction-

    HASHIDA Toshiyuki, NIIBORI Yuichi, MATSUKI Koji, HAYASHI Kazuo

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2000 - 2001

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    An improved three-dimensional simulation model (FRACSIM-3D) for the fractured hot-dry-rock (HDR) geothermal reservoir is developed. It incorporates the mechanical rock-fluid interaction during hydraulic stimulation and quantitatively predicts the 3D reservoir growth behavior. In this model the pre-existing fractures are generated stochastically. The fractal size distribution of the penny-shaped fractures with random orientation is assumed. The fluid flow through the discrete fracture network is simulated by mapping the connectivity of the fractured rock to a regular cubic grid under condition of constant injection pressure. The fluid flow is approximated by the Darcy law equation. The fluid pressure from the injection well induces the growth of the fractures' apertures due to the fracture shear offset. Computation of the fracture dilation requires several iterations: solving the complete flow model simulating the fracture system anew each time and recalculating the shear displacement using the inner fracture pressure from the previous iteration. The numerical model is calibrated on the basis of the field data available for the Hijiori HDR reservoir. For instance, the series of numerical computations was carried for the different randomly seeded initial distributions of fractures and their apertures within the reservoir. The distribution, which leads to a good agreement of the numerically obtained and experimentally detected Hijiori reservoir's volume and growth direction, was chosen as an appropriate one for simulating the natural fractured media. The model was used for the assessment of the adequate stress regime of the Hijiory reservoir since the related field data obtained by the different experimental technique are not very reliable. The latest version of FRACSIM-3D incorporates the multi-borehole system of injection and production wells. This improvement of the model makes possible to analyze the effect of different borehole system arrangement on the reservoir productivity. A number of numerical experiments for the different geometrical boreholes configurations have been conducted. As a result, the optimal arrangements of the production and injection wells, which provide the relevant reservoir recovery rate with lesser amount of active boreholes, are proposed.

  27. Estimation method for Heterogeneous Retardation Effects in Geological Disposal of Radioactive Waste

    NIIBORI Yuicih

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: TOHOKU UNIVERSITY

    1999 - 2000

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    The relation between the mass transport rate and the spatial distribution of retardation coefficient, R_d, has been examined. To express the distribution of retardation effects, this study used the two-dimensional packed bed with two kinds of silica, i.e., silica sand and silica gel particles. The solution of Eu(III) as a tracer was injected into the packed bed. Based on the experiment results of the breakthrough curve, this study proposed two-dimensional mathematical model to explain the retardation effects with two-dimensional advection-dispersion. Using the calculated breakthrough curves, next, we focused on the peak height and its arrival time. To compare them easily, the dimensionless mean residence time was always set at unity. In the results, when the R_d values were distributed perpendicular to the flow direction, the peak height and its arrival time strongly depended on the R_d distribution. This study, for simplicity, considered two kinds of R_d layers, assuming that the small R_d and the large were arranged parallel to one another. The smaller the alternation frequency of the layers became, the higher peak and the shorter arrival-time the breakthrough curve showed. In contrast, as the frequency was large enough, the peak-arrival time almost agreed with the homogeneous case. Further, this study confirmed that the variation of the skewness of R_d had no appreciable influence on the whole mass transport rate. When the 2-D distribution of R_d was described by, e.g., log-normal distribution, the average mass transport rates showed agreement with those on the other probability density functions defined by the same set of the arithmetic mean and the standard deviation of R_d. These tendencies mentioned above were confirmed in the range of Peclet number from 10 to 10^2 for the dimensionless standard deviation at least up to around 1.

  28. 固体-水相互作用の下での金属含水酸化物の沈殿・結晶化の速度機構

    杤山 修, 新堀 雄一

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 萌芽的研究

    Category: 萌芽的研究

    Institution: 東北大学

    1999 - 2000

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    金属含水酸化物の非晶質から結晶への熟成、結晶化の速度機構を解明するために、Fe(III)およびSi(IV)の含水酸化物について以下の実験を行い、それぞれに述べるような知見を得た。 (1)熱重量分析による結晶化速度の評価 非晶質水酸化鉄のゲータイト(α-FeOOH)への転移速度(ここでは結晶化速度と呼称する)の検討のため、固体中の非晶質水酸化物とゲータイトの分率を熱重量分析曲線より評価する方法を提案した。この方法は、非晶質水酸化物とゲータイトの熱重量曲線の違いに着目し、微分熱重量曲線を用いて結晶化度(固相全体に占めるゲータイトの分率)を求めるもので、FT-IRによる方法に比較して再現性を得やすい。 (2)非晶質水酸化鉄からゲータイトへの結晶化速度 上記熱重量分析曲線による方法を用いて、溶液条件(pHおよび温度)を変えて含水酸化物を調製し、非晶質水酸化鉄からゲータイトへの結晶化速度を求めた。その結果、結晶化速度は、固体中の非晶質水酸化鉄の分率に1次、pHに約0.5次の依存性を示し、その活性化エネルギーは約57kJ/molであることを見出した。生成する溶液条件を把握した。 (3)Si(IV)の沈殿生成 Si(IV)の析出についての検討を行い、Fe(III)の沈殿の形態との比較を行った。過飽和となったSi(IV)について、溶液中に予め固相がある場合とない場合の析出形態の比較により、沈殿生成時の過飽和度と沈殿微粒子の界面過剰エネルギーのバランスに依存することが示唆された。このことは、Fe(III)の含水酸化物が、大略として、NH_4OH溶液から沈殿を得る場合には非晶質水酸化鉄が生じ、NaOH溶液より沈殿を得る場合にはゲータイトが生成するという結果に調和的である。

  29. Development of an cultivation in oil reservoir for microbial enhanved oil recovery

    CHIDA Tadashi, SUTO Koichi, NIIBORI Yuichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    1997 - 1998

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    This study, which purpose is establishment of an culture method in oil reservoir for microbial enhanced oil recovery (MEOR), focused on transport phenomena of nutrients and bacteria in porous media. In this study, to investigate these phenomena, there were carried out some experiments and mathematical analyses. A two-dimensional packed-bed with glass beads was made for laboratory experiments of nutrients and bacteria transport phenomena. KC1 solution and lactic acid bacteria (Lactobacillus casei, ATCC15883) were applied to replicate nutrients and useful bacteria for MEOR, The experimental results by KCl solution injections into the bed showed good agreements with the calculations of the two-dimensional mathematical model considering the conversion, the mixing diffusion and the buoyancy force due to differences of the solution concentration. At the case of the results by the bacteria solution, which grew until static phase, into the bed, it was confirmed the clog phenomena which pores in the bed were plugged by bacteria. So, at the mathematical model, there were considered more parameters that indicated clog and declog phenomena in addition to the parameters of the conversion, the mixing diffusion and the buoyancy force. The calculation results showed good agreements with the experimental results. Using the mathematical model, the cases studies were carried out that the distributions of permeability were changed in oil reservoir. At the calculations the permeability was given by Kozeny-Carman's equation. The results of simulation showed that the transport phenomena of nutrients and bacteria were very different with the little change of permeability distributions.

  30. 高濃度二酸化炭素雰囲気における鉄酸化細菌の育成

    新堀 雄一

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 奨励研究(A)

    Category: 奨励研究(A)

    Institution: 東北大学

    1994 - 1994

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    鉄酸化細菌は菌体を構成するすべての炭素を大気中の二酸化炭素から同化している独立栄養細菌である。本研究の代表者はこの細菌の固体への付着と酸化挙動との関係、pH値1以下における育成、集積培養における共生系の解明およびその工学的利用についての検討を進めてきた。一方、近年、二酸化炭素などのグリーンハウスガスの大気中の増加が叫ばれるようになり、排ガスにおける二酸化炭素の吸収源を如何に多様化させるかが問題になっている。そこで、本研究では独立栄養細菌である鉄酸化細菌を、より高濃度のCO_2雰囲気において培養、育成し、細菌による炭素同化速度を評価することを目的とした。 本研究において使用した菌は旧松尾鉱山排水処理場酸化槽の処理水中から採取したものを、長期間連続集積培養を行ったものを用いた。この菌を9K培地とエネルギー源を加え、酸素、二酸化炭素を所定の溶存濃度に設定しながら恒温にて培養した。その間、菌体数を生物顕微鏡にて測定し、菌体数の経時変化を得た。また、第一鉄イオン濃度を過マンガン酸カリウムの滴定によって測り、Fe^<2+>の経時変化を得るとともに、pH値を電極により測定した。 本研究では溶存酸素が不足しないよう、全実験において吹き込みガスの25%を酸素とした。そして、吹き込みガスにおける二酸化炭素濃度を0.03%,0.1%,0.3%,1%,3%,6%,9%および15%とし、その他を窒素とした。なお、溶存ガスや基質などが反応容器中において一様によるよう500rpmで攪拌を行った。また、CO_2濃度の設定順序はランダムに行った。得られた知見を要約して以下に示す。 (1)本実験範囲において最大酸化速度およびその際の1cell当りの酸化速度は高濃度二酸化炭素雰囲気においてもCO_2を0.03%とした場合とほぼ同じであり、細菌は高濃度二酸化炭素雰囲気でも活性を維持できる。 (2)二酸化炭素の影響は細菌の増殖における誘導期の時間に顕著に現れ、CO_2濃度が9%までは濃度を大きくするにつれて誘導期が短くなり、その後は長くなる。その傾向は実験を行った順序に依存しない。 (3)誘導期の時間は9%の場合0.03%の約3分の1になった。また、誘導期から対数増殖期に移行する期間の増殖速度は9%の場合、0.03%の5培以上になった。

  31. Control of producting sulfuric acid in drain by protozoa preying on Thiobacillus thiooxidans

    KOUNOSU Akira, NIIBORI Yuichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for General Scientific Research (C)

    Category: Grant-in-Aid for General Scientific Research (C)

    Institution: TOHOKU UNIVERSITY

    1991 - 1992

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    Sulfur-oxidizing bacteria,collected from a neutralization plant of the abandoned Matuo mine,has been cultured in an enrichment with elemental sulfur.In the culture,we have confirmed protozoa which belongs to Bodo edax without sulfur-oxidizing bacteria and fungus.This study describes interaction between bacteria and protozoa in an enrichment culture.To investigate the interaction,sulfur oxidation experiments are performed under the various conditions.The results obtained are summarized as follows: (1)The elemantal sulfur oxidaition by the bacteria in pure culture is faster than in enrichment.In the case,the yield factor of sulfur-oxidizing bacteria growth in pure culture is about 3 times as large as that in enrichment culture. (2)The ratio of protozoa to sulfur-oxidizing bacteria is nearly constant.At pH value above 0.6,protozoa can increase,but decrease at pH value than 0.6. (3)In pure culture,sulfur-oxidizing bacteria is inhibited at the concentration of Cu^<2+> above lmgdm^<-3> .In enrichiment cultre,the bactreia is in the same as the case of pure culture.Protozoa increases at the concentration of Cu^<2+> ,1,10mgdm^<-3>,but the amount of growth decreases.At 100mgdm^<-3>,protozoa can not increase,and at 1000mgdm^<-3>it can not be confirmed at all after about 200 hours. (4)In the case of subculture with Cu^<2+>, sulfur-oxidizing bacteria is accompanied with Cu^<2+>-resistant ,but protozoa can not do. (5)The yield factor of sulfur-oxidizing bacteria growth in enrichment culture depends on protozoa existence.The value in the protozoa-free case is about 7 times as large as when there exists protozoa. (6)The oxidation rate by the bacteria rises at pH value less than 0.6.This phenomenon may be due to a cycle of nutritive salts through the decomposition of protozoa death cells.

  32. Kinetics of Calcite Dissolution in pH-region of Acid Rain.

    CHIDA Tadashi, NIIBORI Yuichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for General Scientific Research (C)

    Category: Grant-in-Aid for General Scientific Research (C)

    Institution: Tohoku University

    1990 - 1991

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    The dissolution of limestone collected from Akiyoshidai, Yamaguchi Pref., Japan, In dilute hydrochloric acid solution has been followed by measurement both calcium concentration and pH as a function of time, under various conditions of Initial pH, temperature and stirring rate. The initial dissolution rate increases as the stirring rate increasing. The Arrhenius plot shows that apparent activation energy at 7OOrpm of stirring rate is 15kJ/mol for Initial pH4 and 25kJ/mol for Initial pH5. The viscosity of water depends on temperature and differs about two times within the range from 5゚C to 40゚C in this experimental conditions, so stirring rate cannot express the real conditions of bulk fluid. In spite of stirring rate, Stirring Reynolds Number Re_s, which is one of non-dimension numbers possible to express fluid condition, defined as pd^2n/mu, where rho is the density of water, d characteristic length of stirring rate, n the revolutions per second, mu the viscosity of water, is proposed. The initial dissolution rate at initial pH4 is almost proportional to Re_s and is independent from temperature. These facts suggest that the dissolution reaction process of calcite is much faster than the mass transport process of species. In the case of Initial pH5, the initial dissolution rate increases as Re_s Increasing and as temperature raising. The apparent activation energy of initial dissolution rate at Re_s = 7X10^4 for initial pH4 is lkj/mol and for initial pH5 is 12kJ/mol. These values are smaller than those obtained from stirring rate, because the previous studies have not considered fluid condition in estimation of the activation energy. The facts mentioned above suggest that dissolution of calcite in weak acid region Is mass transport controlled reaction.

  33. On Plant Test of Oxidation Reaction by Chemoautorophic Bacteria under the low-pH. unsteady state condition

    KOUNOSU AKira, INOUE Chihiro, NIIBORI Yuichi, ENOMOTO Heizi, NAKAZAWA Hiroshi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Developmental Scientific Research

    Category: Grant-in-Aid for Developmental Scientific Research

    Institution: Tohoku Univ.

    1989 - 1991

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    The authors carried out some experiments for plant test of oxidation reaction, using Thiobacillus ferrooxidans. The conclusions are as follows : (1) A new approximation equation proposed by this research stands for the reaction rate. The equation (a) is available in the technical point of view, and is a function accompanied by some factors which are compatible for the known, fundamental data. (2) The equation is applied into the laboratory experiment data obtained from Tohoku Univ., Iwate Univ. and Dowa mining Co. (3) Also, values in the initial Iron-oxidizing activity are measured from the oxidation experiment data under the various conditions. The equation is derived, assuming a control mechanism of Thiobacillus ferrooxidans in low pH region : ((1+alpha)beta)t=1n((alpha+1-R_t)/(alphaR_t)) (a) Symbols alpha parameter of the rate equation, alpha=X_0/(Ys_0) [-] beta Parameter of the rate equation, beta=kY [h^<-1>] k reaction rate constant [mol cell^<-1> h^<-1>] R_t control function at time t (R_t=[Fe^2]/([Fe^<3+>]+[Fe^<2+>])) s substrate density at time t [mol m^<-3>] s_0 initial substrate density [mol m^<-3>] : t reaction time [h] Y yield factor [cell mol^<-1>] X apparent cell density in the uncontrolled steady state (when R^t=1) [cell m^<-3>] x_0 initial apparent cell density in the uncontrolled steady state [cell m^<-3>] X'_0 initial cell density measured [cell mol^<-1>] A_c A_c=1, Iron -oxidizing activity, when Fe^<2+> 100% [-] A_0 A_0=X_0/X'_0, Iron-oxidizing activity of inoculum, when t=0 [-]

  34. 溶解を伴う多孔質体内の流体流動に関する基礎的研究

    新堀 雄一

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 奨励研究(A)

    Category: 奨励研究(A)

    Institution: 東北大学

    1988 - 1988

  35. Effects of Silica Polymization on Apparent Viscosity of Geothermal Water - Fundamental Study on Precipitation of Silica Scale -

    CHIDA Tadashi, NIIBORI Yuuichi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for General Scientific Research (C)

    Category: Grant-in-Aid for General Scientific Research (C)

    Institution: TOHOKU UNIVERSITY

    1987 - 1988

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    This study discussed on (1) the rate of silica polymerization, (2) the relation between the apparent viscosity and the deposition to carbon steel and (3) the decrease of permeability caused by the precipitaion of silica. The conclusions are as follow: (1) The rate of decrease in soluble silica concentration is proportional to the surface area of polysilicic acid and the twice power of the oversatulated soluble silica concentration, when the experimental conditions are under pH8-9, temperature 30-50゜C, NaCl concentration 0 mol dm^<-3>, initial soluble silica conc. about 520ppm and total silica conc. about 570ppm. (2) As the apparent viscosity of solution increases, the quantity of silica deposition to carbon steel increases. Also as the precipitation is generated, the apparent viscosity of solution increaes rapidly. Then, the experiments conditions are; ph8-9, temp. 30゜C, NaCl conc. 0-1mol dmD1-3@>D1, initial soluble 250-1500ppm. (3) The effects of silica precipitation to the decrease of permeability depend on the particle diameter, when the experiments are carried out by using packed bed with glass beads. In the case of 0.3mm diameter beads, the permeability decreases generally. On the other hand, in the use of 1mm diameter beads, recovery of the permeability after the rapid decrease.

  36. 流れ場における溶解物質の析出及び堆積

    新堀 雄一

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 奨励研究(A)

    Category: 奨励研究(A)

    Institution: 東北大学

    1987 - 1987

  37. Flotation Process Control by Adaptive Control Method

    CHIDA Tadashi, NIIBORI Yuichi, SAKAI Noboru

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Developmental Scientific Research

    Category: Grant-in-Aid for Developmental Scientific Research

    Institution: TOHOKU UNIVERSITY

    1986 - 1987

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    This paper presents a fundamental sudy on the application of the model refernce adaptive control system (MRACS) to a mineral plant. The PID regulator is frewuently used in the plant. However, if is not available on the time-varying plant. because the PID parameters are usually necessary to be readjusted. Then, the MRACS is trid to apply in the plant. it automatically readjusts its parameters, but it is not robust to the randow noise. A mineral processing plant is usually time-varying, and theid input/output signals contain random noises. Therefore, it is necessary to improve the robustness to the noise on the application of the MRACS. Peterson et. al. (1982) presented a robust MRACS with a dead zone to the adaptation algorithm. However, this system can not be used without knowledge for the noise. This paper describes a method which corrects this defect and its application to the PH-conditioned process in a mineral processing plant. Some simulation results are illustrated to show the effectiveness of the presented control method. And next, PHconditioned process was set up and connected with a flotation tester. Then, the PH value was actually measured at the tester. The results show that this control method is available on the time-verying plant, and robust to the random noise.

  38. 砕屑鉱床の生成及び分布解析の基礎的研究-流れ場における砕屑物の挙動解析-

    新堀 雄一

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 奨励研究(A)

    Category: 奨励研究(A)

    Institution: 東北大学

    1986 - 1986

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Teaching Experience 15

  1. プロセス計画・設計論 東京工業大学

  2. エンタルピーと環境問題 岩手大学

  3. 地圏移動現象論 東北大学

  4. 原子炉安全・設計学 東北大学

  5. 化学反応工学 東北大学

  6. 貯留層工学 東北大学

  7. 原子力安全セミナー 東北大学

  8. システム工学 東北大学, 宮城高専

  9. バックエンド基礎実験 東北大学

  10. バックエンド基礎 東北大学

  11. 科学技術とエネルギー 東北大学

  12. 量子サイエンスコース入門 東北大学

  13. 核環境工学 東北大学

  14. エネルギーフロー環境工学 東北大学

  15. 数理解析学 東北大学

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Social Activities 32

  1. 軽水炉高経年化対応セミナー

    2007/08/01 - Present

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    「放射性廃棄物の処分」と題して、放射性廃棄物の処分について整理するとともに処分システムの性能評価の基礎について解説した。講義の中では、現在、日本原子力学会の標準委員会の分科会において取り上げている管理型処分の閉鎖についての標準化の動きにも触れながら、不確実性を含む処分場システムの性能評価についての議論やそれを理解するための基礎事項を解説した

  2. 東北放射線科学センター主催 原子力技術者教育(原子炉物理基礎教育) 講師

    2005/12/05 - Present

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    原子力技術者教育として原子炉物理基礎教育の一環として基礎数学を講義する。

  3. アトムクラブ(女川町)

    2011/08/08 - 2011/08/09

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    女川第一小学校および女川第二小学校を対象にした出前実験「人工いくらをつくろ!」(女川町における原子力教育活動の一環)

  4. 環境教育コロキウム エネルギー先端研究 ヒートポンプと地中熱利用

    2006/02/06 - 2006/02/07

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    エネルギー環境教育研究会主催、宮城教育大学環境教育実践研究センター共催の環境教育コロキウムを開催し、講演を行った。

  5. 高校理科-理科教育の新しい取り組み(講演)自然エネルギーの未来:足下の熱を使った冷暖房・給湯システム

    2005/12/01 - 2005/12/05

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    宮城県教育研修センター

  6. 実態論ベースの原子力安全学に向けて

    2005/08/03 - 2005/08/05

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    地層処分に関する実体論

  7. 東北大学原子力安全セミナー

    2004/08/04 - 2004/08/06

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    放射性廃棄物の処分

  8. 東京工業大学(資源化学研究所)非常勤講師

    2003/12 - 2004/03

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    地下の移動現象論について、特に、不飽和帯における流体流動、物質移動および熱移動について講義を行った。

  9. 地殻熱抽出工学と地殻応力計測法

    2003/08/04 - 2003/08/06

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    地下水流動と地中熱利用ヒートポンプ

  10. アトムクラブ(女川町)

    2010/10/15 -

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    小学生を対象にした出前実験「人工いくらをつくろ!」(女川町における原子力教育活動の一環)

  11. 財団法人仙台市産業振興事業団主催 「寺小屋せんだい」 講演

    2009/10/16 -

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    第50回「寺子屋せんだい」において地中熱利用の取り組みについて講演を行った。

  12. アトムクラブ(女川町)

    2009/09/20 -

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    人工いくら作りの出前実験を行った。

  13. 杜の都まちづくり広場ワークショップ 講演

    2009/02/25 -

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    杜の都まちづくり広場ワークショップにて東北大における地中熱利用について講演を行なった。

  14. 秋田県湯沢市立三関小学校向け「科学教室」(机の上で飛行機雲を作ろう!)

    2008/11/14 -

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    ことも科学キャンパスは仙台市内の小学校を対象にしているため、当小学校より創造工学センターへ依頼があり、実施したものである。

  15. ウイークエンドサークル「まなびっこ」(女川町)

    2008/06/14 -

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    小学生を対象にした出前実験(「人工いくらをつくろ!」) (女川町における原子力教育活動の一環)

  16. 原子力委員会 政策評価部会 ご意見を聴く会 シンポジウムパネリスト

    2008/03/31 -

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    原子力委員会における放射性廃棄物の処理・処分政策に対する意見を専門家の立場からシンポジウムパネリストとして述べる。

  17. 潮活動(女川町)

    2007/10/24 -

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    中学生を対象にした出前実験「人工いくらをつくろ!」(女川町における原子力教育活動の一環)

  18. バックエンド週末基礎講座オーガナイザー・座長

    2007/10/20 -

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    日本原子力学会バックエンド部会が主催するバックエンド週末基礎講座の一部を一般公開とすることを企画し、その座長を務めた。

  19. 日本原子力学会バックエンド部会週末基礎講座(核燃料サイクルとバックエンドについての概要と基礎)

    2006/10/28 -

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    放射性廃棄物処理処分の分野に入って来られた若い方々を対象に、週末の時間を利用して、広範な処理処分の分野に関する基礎的な知識を身につけていただくとともに、参加者相互の交流の機会を提供することを目的とする。特に、実験の具体的手順や必要な道具立て、具体的な解析法など、実践的な知識を身につけていただけるような講義を行う。

  20. 地下利用の工学なくして、人類に未来なし

    2005/12 -

  21. 東北大学原子力安全セミナー

    2005/08/03 -

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    放射性廃棄物の処分

  22. 中学生のための放射線教室(青森県五所川原第三中学校)

    2004/09 -

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    霧箱を参加者全員に作成してもらい、身の回りの放射線を実感する。

  23. 出前授業 (宮城県 第一女子高等学校) 霧箱の製作と身のまわりの放射線

    2004/03 -

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    霧箱を参加者全員に作成してもらい、身の回りの放射線を実感する。

  24. 出前授業 (宮城県 鼎ガ浦高等学校) 原子力エネルギーと環境問題

    2003/12 -

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    エネルギーの中での原子力の利用について説明するとともに、環境問題について解説を行った。

  25. 地下水利用で化石燃料削減

    2003/10/24 -

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    星野リゾート(北佐久郡軽井沢町)は、東北大学工学研究科の新堀助教授と共同で、地下水の熱を利用した独自の熱供給システムを開発した。

  26. 大学等地域開放特別事業『大学Jr.サイエンス&ものづくり』:机の上で飛行機雲を作ってみよう!(対象:小学生、中学生および父兄)

    2003/08 -

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    霧箱の作成を通じて、身の回りの放射線についての教育を行った。

  27. 中学生のための放射線教室(福島県郡山市立第二中学校)

    2003/07 -

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    霧箱を紹介し、身の回りの放射線を実感して頂くとともに、その原理を説明した。

  28. 出前授業 (宮城県 泉館山高等学校 ) 霧箱の製作と身のまわりの放射線

    2003/07 -

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    霧箱を参加者全員に作成してもらい、身の回りの放射線を実感する。

  29. 出前授業の紹介 (宮城県高等学校理科研究会仙塩支部物理部会) 霧箱の製作と放射線の計測

    2002/08 -

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    霧箱を参加者(理科教員)全員に作成してもらい、身の回りの放射線を実感する。

  30. 原安協だより 185号 プロフィール

    2002/01/01 -

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    当協会「地層処分の安全性に関する調査検討専門委員会」の委員として,当人のプロフィールの取材を受け,それが記事になったもの。

  31. 出前授業(宮城県立仙台第二高等学校)霧箱を使って放射線をつかまえる

    2001/07 -

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    霧箱を参加者全員に作成してもらい、身の回りの放射線を実感する。

  32. 出前授業(宮城県立仙台第二高等学校)霧箱を使って放射線をつかまえる

    2000/07 -

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    霧箱を参加者全員に作成してもらい、身の回りの放射線を実感する。

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Media Coverage 4

  1. 地中の”複雑系”を分析

    電気新聞

    2015/06/16

    Type: Newspaper, magazine

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    東北大学大学院原子力地質工学分野の紹介(全国理系学び舎紀行)

  2. 原子力eye 「六ヶ所村大学院出前講義 奮闘記 ②」

    日刊工業出版プロダクション

    2009/11/01

    Type: Newspaper, magazine

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    東北大学大学院工学研究科量子エネルギー工学専攻の社会人院生の中で,青森県六ヶ所村およびその近隣に在住する院生への六ヶ所村での出前講義について紹介している。

  3. Air Mail カルフォルニアバークリーでの3.5か月の生活

    原子力安全研究協会

    2006/10/25

    Type: Other

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    平成18年7月1日から10月15日までのカルフォルニア大学バークリー校原子力工学科(以下UCB-NEと略記)での生活を取りまとめたもの。 (原安協だより 第214号 13-17

  4. 未来のテクノロジーを学びたい

    リクルートムック

    1998/09/24

    Type: Newspaper, magazine

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    リクルートムック'98秋号:「自分にいい大学がわかる本」において 資源・エネルギー問題をシステムとして捉えた研究を紹介した。

Other 36

  1. 冠水埋設環境における劣化したセメント系材料とセシウムとの化学的相互作用に関する実験研究

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    低レベル放射性廃棄物の埋設システムの構築には、ピット本体や廃棄物の充填材のみならず、中深度処分における地下坑道の建設にも多くのセメントが用いられる。地下埋設環境では、セメント系材料は、その主成分であるカルシウムシリケート水和物のカルシウム成分が次第に地下水に溶脱することにより、劣化する。また、セメントの間隙水はKイオンやNaイオンも含み、その溶脱により周辺地下水のpHを10以上に変質することが懸念されている。本研究では、この劣化したセメント系材料の核種閉じ込め性について、セシウムを用いて実験的に明らかにすることを目的とする。

  2. 過飽和ケイ酸塩の緩衝材中での析出速度の評価

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    超長期にわたるニアフィールド変遷について,担当者らは地層処分場の建設に大量に必要となるセメント系材料と処分場との関連について着目している。セメント系材料の使用は、処分場周辺の地下水を高アルカリ化し、セメント間隙水から供給されるCaイオンと岩盤からのSiの溶出によってカルシウムシリケート水和物(CSH: Calcium Silicate Hydrate)などの二次鉱物を生成させることが知られている。CSHは高pH(>9.5)において安定であり,セメント間隙水に含まれる0.1 MのNaイオンやKイオン、0.01 MのCaイオンの長期に亘る溶出により処分場周辺を高pHに維持する。さらに、それらの下流では高アルカリから地下水の元のpH(8程度)に戻る領域、すなわちアルカリフロント領域が形成される。この領域では過飽和ケイ酸の析出など、ケイ酸の再分配に係る反応が生じる。これらの化学反応は、岩盤亀裂のみならず、処分坑道内の埋戻し材内などpH勾配や温度勾配が生じる場所においても起こる。他方、処分坑道の埋戻し材に粘土系材料を用いることにより処分坑道内は、低透水性が維持されるように設計される一方で、処分坑道内に湧水量の多い亀裂から水みちが進展する可能性も指摘されている。 そこで、本予察試験は、緩衝材や埋戻し材において主要となるベントナイトへの過飽和ケイ酸の析出挙動について検討し,アルカリフロントにおけるケイ酸の析出が地下水流路の閉塞を通じて核種の遅延効果に寄与するか否かについて、基礎となる予察試験を行う。

  3. 地下埋設環境におけるセメント系材料による放射性廃棄物閉じ込めバリアの形成に関する実験研究

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    放射性廃棄物の埋設システムの構築には,ピット本体やTRU廃棄物等の充填材のみならず,余裕深度処分や地層処分における地下坑道の建設にも多くのセメントが用いられる。セメントの間隙水はpH13以上であり,セメントの劣化は周囲の地下水を高pH化し,履土や岩盤の変質されることが懸念されている。本研究では,地下水に冠水している状態において,劣化したセメント系材料と核種との相互作用に着目し,その作用がむしろ放射性廃棄物を閉じ込める一種のバリアになることを実験的に明らかにする。

  4. 過飽和ケイ酸塩の緩衝材中での析出速度に関する予察的試験

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    地層処分システムの構築にはセメント系材料の利用が不可欠である。担当者らは、これまで、埋め戻し後においてセメント系材料の変質が、化学的なバリアを形成することに着目してきた。これらのバリアは、高アルカリ化した流路におけるカルシウムシリケート水和物(CSH)の析出、さらにその周囲のアルカリフロント(高pHから地下水の本来のpHに戻る領域)の流路における過飽和ケイ酸の析出など、複数の過程により形成される。そこで、本予察試験では、緩衝材であるベントナイトがセメント間隙水や地下水に含まれるKイオンおよびCaイオンにより変質することに着目し、K型ベントナイトおよびCa型ベントナイトを固相とした過飽和ケイ酸の析出速度について実験的な検討を試みる。実験では、室温・窒素雰囲気下において、初期ケイ酸過飽和濃度および固相添加量を実験パラメータとする。また、圧密ベントナイト上への過飽和ケイ酸の析出挙動についても析出実験を試み、圧密ベントナイト表面近傍の変質や析出物のSEMやXRDによる観察を行う。さらに、埋め戻し材中の変質したベントナイトへのケイ酸の析出による流路の閉塞挙動について、実験から得たみかけの析出速度定数を用いて数値計算により整理する。

  5. 放射性廃棄物の埋設環境におけるセメント利用に起因したケイ酸析出反応とその止水性に関する実験研究

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    コンクリートピット処分や余裕深度処分などの低レベル放射性廃棄物の処分場や事故廃棄物の中間貯蔵施設では,ピットや廃棄物の充填材,地下坑道の建設に多くのセメントが用いられる。セメントの間隙水はpH13以上であり,セメントの劣化は周囲の地下水を高pH化し,履土や岩盤の変質されることが懸念されている。本研究では,その変質現象が地下水流路の閉塞(バリア形成)につながる条件を明らかにすることを目的とする。 地下水が高pH化すると履土等のケイ酸塩鉱物からケイ酸が溶出する。これは,ケイ酸の溶解度はpH9.5以上になると急激に上昇するためである。しかし,処分システム等の周囲の地下水(pH8程度)と混合すると,pHは減少し,ケイ酸が過飽和となり,コロイドの生成や流路への析出反応を示す。本研究では,このケイ酸の挙動を活用して,核種と錯体を形成し易いコロイドの生成を抑え,析出反応が支配的となる条件を明らかにする。このことにより,地下水の流路の閉塞によるバリア形成条件を予め考慮した処分システムの設計を目指す。

  6. 廃止措置のための格納容器・建屋等信頼性維持と廃棄物処理・処分に関する基盤研究及び中核人材育成プログラム

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    東北大学は「東日本大震災からの復興・新生の先導」を全学ビジョンとして掲げ、その実現のために「福島第一原子力発電所の廃止措置への貢献」を最重要課題の一つとしている。本プログラムでは、東北大学の伝統的な強みである材料分野のポテンシャルを活用すべく広範な分野が連携した全学横断組織を形成し、さらに福島大学及び福島高専の専門家の協力を得て基盤研究を加速する。また、専用の学生教育カリキュラムを整備して、安全な廃止措置をリードできる中核人材の育成を図る。このプロジェクトを実施する過程で、長期にわたる研究及び人材育成体制を構築することをプログラム全体の目標とする。 廃止措置の現場のニーズを踏まえた優先研究課題として、『(1)格納容器・建屋等の健全性確保のための基礎・基盤研究』と『(2)燃料デブリの処理と放射性廃棄物の処分に関する基礎・基盤研究』の2つの課題に取り組む。各研究課題には具体的目標を設けて現場で役立つ成果の創出を目指す。人材育成面では、「廃止措置工学コース」を設け、基盤研究への学生の主体的な参画を図るとともに、専用カリキュラムを整備して、状況が複雑に変化する可能性がある廃止措置工程において異分野専門家との連携を図り、的確かつ重層的な対応を取ることができる中核人材を育成する。

  7. 原子力関連施設建設のセメント利用により発現するケイ酸塩析出反応に伴う破砕帯等地下水流路の閉塞効果に関する実験研究

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    原子力プラントや低レベル放射性廃棄物の処分システムでは、多くのセメントが用いられる。セメントの間隙水はカルシウムイオンを多く含み、周囲の地下水と接触することにより次第にカルシウム分が溶出する。その場合、溶出したカルシウムは周囲の覆土や岩盤のケイ酸成分と反応し、ケイ酸カルシウムなどのケイ酸塩を析出する。すなわち、地下水は比較的流れ易い流路を選んで流れることから、析出するケイ酸塩により破砕帯等の流路を閉塞させる効果が期待される。そこで、本研究では、セメントからのカルシウム分の溶脱が破砕帯等の地下水流路の閉塞につながる条件を、地下水流速や析出反応速度とのバランスの観点から明らかにすることを目的とする。なお、地すべり等の地盤の変形は主に地下水の存在に起因して発生することから、地下水流路の閉塞効果は、その発生を低下させることに寄与する。本研究は、原子力関連施設とその周辺環境との関係について着目し、セメント利用による当該施設の更なる頑健性を検討するもので、新たな視点を含んでいる。

  8. 使用済燃料の直接処分における人工バリア材料に関する研究

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    独立行政法人日本原子力研究開発機構(以下、原子力機構)が経済産業省資源エネルギー庁から受託した「平成25年度地層処分技術調査等事業 使用済燃料直接処分技術開発」(平成25年度受託)においては、わが国の原子力政策の策定や核燃料サイクルのシナリオの選択に柔軟に対応できるように、使用済燃料の直接処分に係る処分施設及び人工バリアの設計・施工に関する技術開発を実施することにより、使用済燃料の直接処分の技術的可能性/信頼性を提示する技術的取りまとめに資することを目的としている。 本研究では、上記目的を踏まえ、使用済燃料の直接処分に必要な基盤整備の一環として、人工バリアの長期健全性の観点から金属製処分容器の候補となる材料に関する調査研究を実施した。

  9. ラマン分光法等に基づく泥岩中の核種移行挙動研究

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    泥岩中の核種移行メカニズムを明らかにすることを目的とし、泥岩の分析及び泥岩中の核種移行挙動に関する考察を実施する。 粘土成分を比較的多く含む泥岩を試料としてラマン分光法等を用いた分析調査を実施し、泥岩の性状を把握する。また、調査結果から泥岩中の核種移行挙動に関する理論的考察を行う。

  10. 処分場再冠水に伴うニアフィールドの変質過程に関する予察的試験

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    地層処分システムの構築にはセメント系材料の利用が不可欠である。これまで、本試験実施者らは、埋め戻し後の再冠水においてセメント系材料の変質が、化学的なバリアを形成することに着目してきた。これらのバリアは、高アルカリ化した流路におけるカルシウムシリケート水和物(CSH)の析出、さらにその周囲のアルカリフロント(高pHから地下水の本来のpHに戻る領域)の流路における過飽和ケイ酸の析出など、複数の過程により形成される。そこで、本予察試験では、これら過程の時系列を整理することを目的に、流動場におけるCSHの形成過程の追跡を行い、そのみかけの析出速度定数を得るとともに、アルカリフロントにおけるケイ酸の析出挙動に及ぼす過飽和濃度の影響についての実験を行い、そこから得られる析出速度定数との比較検討を行った。また、これまで、処分場周辺の変質過程については、一定の地下水流速を仮定したものが多く、本来の圧力勾配を一定にした場合についての検討が十分なされていない。そこで、本予察試験では、圧力勾配一定の条件下での析出と流路の閉塞との関係を、実験から得られたみかけの析出速度定数を用いて整理することも試みた。

  11. 地下冠水状態における核種とセメント系材料との相互作用に関する実験研究

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    研究目的 放射性廃棄物の処分システムでは、多くのセメント系材料が用いられ、これまで、乾燥過程を経たセメントと核種との相互作用が調べられてきた。しかし、それらの相互作用は地下水によって冠水された状態において生じ、また、セメント系材料は地下水との接触により劣化していく。そこで本研究では、冠水状態およびカルシウムの溶脱による劣化を考慮して、核種とセメント系材料との相互作用を定量化し、セメント系材料が構造物としての役目を終えた後も、核種を固定化する化学的なバリアとして機能することを明らかにすることを目的とする。 研究概要 セメント系材料の主成分であるカルシウムシリケート水和物(以下, CSHと呼称)を、乾燥過程を経ることなく、調製し、その放射性核種との相互作用を核種の蛍光寿命から調べる。蛍光は、所定の核種が一旦レーザにより励起され、安定な準位に戻ることにより発生する。その寿命は、核種周囲の水分子数に依存し、周囲に水分子が多いと短くなり、セメント系材料に固定化されるなど、核種周囲の水分子数が減少すると長くなる。CSHは冠水状態にあると構造を変化させ、核種を固定化しながらより安定になろうとすると期待されるが、従来この効果を定量化した例はない。本研究では冠水・劣化した状態においてもセメント系材料が核種を固定化する化学的なバリアとして機能することを明らかにする。

  12. 天水涵養による垂直地下水流を利用した場合の地中採熱量の予測手法

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    天水涵養による垂直地下水流を利用した場合の地中採熱量の予測手法を開発とその妥当性を実証試験を行うことにより示した。

  13. 人工バリアシステムの長期的な挙動の把握に関する技術課題の検討

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    淡水系の溶媒を用いてCSHを合成し、CSHと核種との相互作用を、主としてレーザラマン分光法により検討する。そこでは、これまでの純水系を溶媒とした知見との比較、核種濃度の依存性、さらに、蛍光寿命の結果との整合性を含め、CSHと核種との相互作用についての考察を加える。本実験では、核種としてAm(III)の代替としてEu(III)を主に用いるが、ラマン分光法を用いたCSHとヨウ素(ヨウ素酸イオン)との相互作用との比較検討も行う予定である。本実験の特徴は、処分システムの冠水後のセメント系材料の劣化に伴い生成する比較的Ca/Si比の低い二次鉱物としてのCSHについて着目している点にある。これらの核種取り込み性を調べるため、本実験では、CSH試料を乾燥させることなく利用し、処分場周辺の化学バリアとしてのセメント系材料の利点を明らかにする。

  14. 不均質系現象ホリスティック評価(放射性廃棄物処分システムに対する確率論的安全評価)

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    本研究では、放射性廃棄物の地層処分システムの安全確保の基本的な考え方を整理し、原子炉の安全評価に用いられる確率論的安全評価の手法を処分システムに適用する際の課題を検討するとともに、関連する一つの例として、パラメータの不確実性についての具体例を提示する。

  15. 電気伝導度検層解析の最適化手法の研究

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    廃棄物の地下処分における岩盤亀裂の水理特性を把握するために、電気伝導度検層データを高効率/高精度で解析するためのソフトウエァの開発する

  16. 原子力研究基盤整備プログラム

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    長期的視点に基づき,核燃料サイクル関連技術,特にバックエンド技術(放射性廃棄物の処理・処分技術)の人材育成を強化する.そのために,既存施設である本学工学研究科RI施設において計測・分析装置を飛躍的に強化充実させ,関連する学生実験を強化するとともに,六ヶ所サイトのニーズに応える戦略的な教育研究活動を一層強化する.この取り組みにより原子力特有の基礎分野の研究教育基盤の整備し,本学の特色の一つとして世界をリードする先進バックエンド研究の展開を図る.

  17. アルカリフロントにおけるコロイド状ケイ酸の動的挙動と核種移行との関係

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    地層処分環境下において,人工バリア領域で支保工あるいは廃棄体にセメントが用いられる場合,セメント/母岩境界付近のミキシング・ゾーン*1)でpHの高いセメント間隙水によって母岩からケイ酸が溶出し,アルカリフロント*2)近傍でコロイド状ケイ酸の析出による母岩の変質(非晶質化)が起こることにより,核種移行挙動に影響を及ぼす可能性がある。本研究では,セメント/母岩境界付近のミキシング・ゾーンで生成するコロイド状ケイ酸について,ミクロ的・マクロ的諸特性に基づき,アルカリフロント近傍における固相存在下での動的挙動及び核種移行挙動に及ぼす影響を評価するとともに,JAEAのコロイド影響評価コードCOLFRAC-MRLへ導入可能な形でデータを整理し,このコードを用いて様々な地下水条件において核種移行に及ぼす影響を定量的に予測する。 *1)ミキシング・ゾーン:人工バリアと天然バリアの境界付近で,地下水の化学的特性が連続的に変化する領域 *2) アルカリフロント:セメント/母岩境界付近のミキシング・ゾーンのうち,セメント間隙水(pH13程度)が周囲地下水と混合され,pHが低下する場所

  18. 国際コンピテンシー人材育成教育プログラム(海外大学(UCB)との交流会)

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    カリフォルニア大学バークレー校原子力工学科(以下UCB-NEと略記)とはこれまで当学科との共同研究が進められており、受け入れ担当となって頂いたJ.Ahn教授との相談により、交流会を平成18年9月20日から9月25日に実施することとなった。参加学生(4名)は、学科(量子)内の所定の選考方法(成績を基本にする)により選抜されたものであり、結果として、すべて異なる研究室に所属している。 なお、実施担当教員は、平成18年7月1日から10月15日の間、文部科学省大学教育の国際化推進プログラム(海外先進研究実践支援)をUCB-NEにおいて進めており、学生の引率を本学科の藤原充啓助手に依頼し、UCBにて合流して当交流会を実施している。 具体的実施内容(概要)は次の通りである。 本交流会の内容は次の通り。 9月20日 米国サンフランシスコ空港到着、バークリーに移動 9月21日 J.Ahn教授(UCB-NE)の研究室を訪問し、次の2つの授業を体験した。 授業コード授業名担当の先生時間帯教室建物 NE 255Numerical Simulation in Radiation TransportProf. Vujic11:00-12:30237Cory Hall NE 124Radioactive Waste ManagementProf. Ahn12:30-14:00237Cory Hall さらに、原子力共生関係の会合および懇親会を開催しUCB-NEの先生方や学生との意見交換を行った。 9月22日 UCB-NEの協力研究室(協力講座)であるローレンスバークリー国立研究所 Dr. Karasaki研究室およびProf. Leung研究室を訪問し、研究所の全体の説明、放射性廃棄物の処分関係の研究および加速器関係の研究の紹介を受けるとともに、各自の研究を紹介して、コメントを受けた。 9月23日 UCBキャンパス見学、国際会館見学し、UCBの学生生活の紹介を受けた。 9月24日 バークリーからサンフランシスコ空港に移動し、成田へ移動。 9月25日 成田着、帰仙。 参加学生は、当交流会を通じて、米国の文化に触れ、UCBの講義や同世代のUCB学生との討議を体験することができた。参加した学生は今後の東北大学における勉学、研究に、この貴重な体験を活かし、さらに励みたいと感じている。特にUCB学生の授業の受け方は、講義の途中に積極的に質問をするもので、参加学生に大きな刺激を与えた。(参加学生の1名は、UCB-NEの講義の中で、現在取り組んでいる研究紹介を急遽許可されて、UCB-NEの学生と他の参加者が一緒になって当該研究について考える場面もあった。)さらに、先生方を交えた学生間の懇親会では、UCB-NEの学生と原子力の地域共生について議論し、その重要性や文化の違いについて具体的な事例

  19. 量子サイエンスと地下利用工学の先端融合

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    本研究は,本学新融合領域創成研究会において生体・エネルギー・物質材料研究班に所属し,世界的にも喫緊の課題である放射性廃棄物の地層処分研究において,量子サイエンスと地下利用工学の新融合に取組んだものである. 地層処分の健全な実施は,軽水炉をはじめとした原子力エネルギーの利用を円滑化する一方で,放射線毒性など生体に影響を及ぼす可能性を,人工のバリア材,天然のバリア材を組み合わせて如何に抑え,透明性を持って評価できるかが重要であり,従来の単一の研究分野では到底解決できないものである.本取組みは,その新融合における大学院教育システムの確立基盤を,常に世界の最先端の水準で確認し,研究課題および手法について検討・提案を図ることを目的とした。 具体的には、取組み担当者がこれまで進めてきた地下環境を想定した実験的,理論的な研究の中で,特に地下の持つ不均一性に着目した評価解析手法に関する研究を,派遣先の受入教員である米国カルフォルニア大学バークレー校(以下, UCBと略記)原子力工学科Joonhong Ahn準教授とともに共同で進め,今後の当該分野の教育研究をより一層の高度化・国際化させた. さらに、近年,米国では,原子力工学が改めて注目されつつあり,地下を利用した廃棄物の処分といった観点を含めた原子力利用の高度利用についての教育機関としての機能を、教員そしてそれを受ける院生と交流しながらわが国における当該分野の教育研究にこれまで以上に円滑に活かすことが可能となった.

  20. 人工バリアの設計・製作に関する技術課題検討

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    高レベル放射性廃棄物人工バリアの設計・製作に関する技術課題検討についてケイ酸の挙動に関する実験的検討を行う。

  21. 瑞浪DH-15号孔電気伝導度検層解析

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    核燃料サイクル開発機構による瑞浪地科学センターにて実施された電気伝導度検層の解析を行い、29の亀裂の透水係数および周囲圧力を決定した。

  22. セメント利用によるニアフィールド母岩透水性変化の評価 -強アルカリ地下水の地球化学的影響評価に資する基礎技術の構築

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    地層処分システムの構築にはセメントの利用が必須であるが、セメントと地下水が接触すると、地下水のpHは13程度まで上昇する。このことは、母岩を変質させ、処分場近傍(ニアフィールド)の透水性の大きな変化を起こす可能性がある。そこで、本研究では、溶解を伴う固相表面キャラクタゼーション(ミクロな視点)と浸透性の変化(マクロな視点)を定量的に関連付ける検討を行っている。

  23. 核燃料関連施設の品質保証(量子エネルギー工学研究助成)

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    日本原燃株式会社の品質保証活動について専門的立場から助言を行った。

  24. 平成15年度大学等地域開放特別事業(机の上で飛行機雲を作ってみよう!)

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    小中学生およびその父兄を対象に、霧箱による放射線の観察実験を行った。

  25. 平成15年度 革新的実用原子力技術開発提案公募事業:セメント系材料が及ぼす処分場岩盤への影響評価に関わる技術開発

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    セメント系材料が及ぼす処分場岩盤への影響評価に関わる技術開発を行った。

  26. スパ・リゾートにおける熱供給システムの設計

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    軽井沢にあるホテルリゾートの改修に伴う熱供給システムについて地中熱利用ヒートポンプの有用性を示し、実証試験の解析を行った。

  27. 地層処分システムにおけるニアフィールド要素長期相互作用の検討

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    セメント構造物と地下水との化学的相互作用に関連する高レベル放射性廃棄物処分場近傍(ニアフィールド)における変質の空間的領域の予測のために、固相存在下でのポリケイ酸の動的挙動を実験的に整理した。

  28. GeoHP熱供給システムの設計

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    星野リゾートにおける地中熱利用ヒートポンプの導入を提案するとともに、実証試験の方法について検討した。

  29. 地中採熱技術に関する基礎研究

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    地中熱利用ヒートポンプの実証試験の解析において特に地下水流動を考慮した当該システムの設計指針について基礎的研究を進めた。

  30. NEDO地球環境技術国際共同研究事業(GHPの普及促進に関する国際共同研究)

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    スイス連邦チューリッヒ工科大学に客員研究員として2ヵ月滞在し(1999.10.7-1999.11.30)、地中熱利用についてのスイスでの状況を把握するとともに、その設計技術手法を検討した。

  31. 固体-水相互作用の下での金属含水酸化物の沈殿・結晶化の速度機構

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    一般受託研究 固体-水相互作用の下での金属含水酸化物の沈殿・結晶化の速度機構について実験的な検討を行い、これらのメカニズムを速度論的に明らかにした。

  32. World Geothermal Congress '95 における口頭発表

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    World Geothermal Congress '95 において、熊本県の地熱地域の地表放熱量について詳細解析した結果を口頭発表を行うとともに、関係の先端情報を収集した。

  33. 地下亀裂層における沸騰および析出を伴う熱水流動のシミュレーションの国際会議での口頭発表

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    地下亀裂層における沸騰および析出を伴う熱水流動のシミュレーションの国際会議での口頭発表をWGC'95(イタリア、フィレンツェ)にて行った。また、WGC前後に地質巡検(ポーランド、スロバキア、ハンガリーおよびルーマニア)に参加した。 なお、本国際会議の渡航にあったては、東北開発記念財団からの補助金の不足分を申請し、採択されたものである。

  34. 金属鉱床等地下における熱水、特に水-水蒸気ニ相流の物質輸送モデルに関する調査(スタンフォード大学)

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    スタンフォード大学における石油工学科でのワークショップに参加、口頭発表を行いとともに、金属鉱床等地下における熱水、特に水-水蒸気ニ相流の物質輸送モデルに関する調査した。

  35. 地下亀裂層における沸騰および析出を伴う熱水流動のシミュレーション

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    鉱床形成過程における熱水の役割について定量的な解析を行なった。提案した数学モデルを用いて、既に報告されている地熱地帯における観測値(温度分布、地表における放熱量およびその分布と比較し、数学モデルの妥当性を示した。また、析出を考慮すると、考慮しない場合に比較して蒸気比が大きくなる傾向を示し、このことが閉塞の前兆として表れることが分かった。

  36. 多孔質体における二相流れ -水-水蒸気流れに及ぼす相変化の影響-

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    本報告は多孔質体における二相流れに関する基礎的研究として水-水蒸気流れに及ぼす相変化について述べたものである。実験はガラスビーズ充填層を373K以上の恒温槽に水平に浸すことにより行われる。実験結果は,非濡れ相の相対浸透率と飽和率の関係式において新たなフィッテングパラメータCを有する一次元二相モデルの計算結果と比較される。パラメータCは,気泡が多孔質体における支配的な流路を流れる際,水と気泡の界面が変形を始める臨界点である。本研究から次の結論が得られる。(1)多孔質内における相変化を伴う水-水蒸気流れにおいて,水と気泡の流れに及ぼす気泡の阻害効果であるいわゆるJamin effectが存在する。(2)パラメータCを含んでいる非濡れ相の相対浸透率曲線はWyckoffら^<1)>によって実験的に示された水飽和率とガスの相対浸透率の関係とおおよそ一致する。(3)提出された数学モデルは少なくとも蒸気比が0.6より小さい範囲において,相変化を伴う水-水蒸気流れを表す。 This paper describes a study on effects of phase-change on water-steam flow, as one of fundamental studies for two-phase flow through a porous medium. The experiments are carried out, using a packed bed submerged horizontally in a thermostat kept the temperature higher than 373K. The experimental results are compared with the calculations based on a one-dimensional two-phase model which has a new fitting parameter C in the empirical equation relating the relative permeability for a non-wetting phase to the saturation. The parameter C indicates a critical point at which a wetting phase starts to obstruct a non-wetting phase flow through dominative paths in a porous medium.<BR>The conclusions are as follows :<BR>(1)There exists "Jamin effect" in

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