Updated on 2025/03/29

写真a

 
TERASAKI Hidenori
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Professor
Position
Professor
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Degree

  • 理学博士 ( 筑波大学 )

Research Interests

  • Iron alloy

  • Core

  • Physical properties of liquids

  • High Pressure Experiments

  • Planetary interior structure

  • Differentiation of planetary interiors

Research Areas

  • Natural Science / Solid earth sciences

Education

  • University of Tsukuba   大学院地球科学研究科  

    1997.4 - 2002.3

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  • University of Tsukuba   第一学群自然学類  

    1993.4 - 1997.3

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Research History

  • Okayama University   The Graduate School of Natural Science and Technology   Professor

    2020.4

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    Country:Japan

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  • Osaka University   Graduate school of Science, Department of Earth and Space Science   Associate Professor

    2011.4 - 2020.3

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  • Tohoku University   Graduate school of Science, Department of Earth and Planetary Materials Science   Assistant Professor

    2004.4 - 2011.3

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  • University of Bayreuth   Bayerisches Geoinstitut   Postdoctoral fellow

    2002.4 - 2004.3

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Professional Memberships

  • THE JAPAN SOCIETY OF HIGH PRESSURE SCIENCE AND TECHNOLOGY

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  • American Geophysical Union

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  • THE IRON AND STEEL INSTITUTE OF JAPAN

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  • THE JAPANESE SOCIETY FOR PLANETARY SCIENCES

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  • Japan Association of Mineralogical Sciences

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Committee Memberships

  • 日本鉱物科学会   Elements委員会副委員長  

    2024.9   

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    Committee type:Academic society

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  • 日本高圧力学会   会計幹事・評議員  

    2023.9   

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  • 日本高圧力学会   渉外幹事・評議員  

    2014.9 - 2016.8   

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    Committee type:Academic society

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  • 日本高圧力学会   高圧討論会実行委員  

    2011.11 - 2012.11   

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    Committee type:Academic society

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  • 日本鉱物科学会   行事委員  

    2011.10   

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    Committee type:Academic society

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Papers

  • Development of density measurement at high pressure and high temperature using the x-ray absorption method combined with laser-heated diamond anvil cell Reviewed

    Hidenori Terasaki, Hiroyuki Kamina, Saori I. Kawaguchi, Tadashi Kondo, Ko Morioka, Ryo Tsuruoka, Moe Sakurai, Akira Yoneda, Seiji Kamada, Naohisa Hirao

    Review of Scientific Instruments   96 ( 3 )   033907   2025.3

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:AIP Publishing  

    The densities of liquid materials at high pressures and high temperatures are important information to understand the elastic behavior of liquids at extreme conditions, which is closely related to the formation and evolution processes of the Earth and planetary interiors. The x-ray absorption method is an effective method to measure the density of non-crystalline materials at high pressures. However, the temperature condition of the x-ray absorption method using a diamond anvil cell (DAC) has been limited to 720 K to date. To significantly expand the measurable temperature condition of this method, in this study, we developed a density measurement technique using the x-ray absorption method in combination with a laser-heated DAC. The density of solid Ni was measured up to 26 GPa and 1800 K using the x-ray absorption method and evaluated by comparison with the density obtained from the x-ray diffraction. The density of solid Ni with a thickness >17 μm was determined with an accuracy of 0.01%–2.2% (0.001–0.20 g/cm3) and a precision of 0.8%–1.8% (0.07–0.16 g/cm3) in the x-ray absorption method. The density of liquid Ni was also determined to be 8.70 ± 0.15–8.98 ± 0.38 g/cm3 at 16–23 GPa and 2230–2480 K. Consequently, the temperature limit of the x-ray absorption method can be expanded from 720 to 2480 K by combining it with a laser-heated DAC in this study.

    DOI: 10.1063/5.0223133

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  • The extent of liquid immiscibility in planetesimal cores Reviewed

    G.D. Bromiley, M. Varnam, H. Terasaki, T. Komabayashi, J. Barosch

    Geochemical Perspectives Letters   33   7 - 12   2024.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:European Association of Geochemistry  

    DOI: 10.7185/geochemlet.2445

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  • Wetting property of Fe–S melt in solid core: Implication for the core crystallization process in planetesimals Reviewed International journal

    Shiori Matsubara, Hidenori Terasaki, Takashi Yoshino, Satoru Urakawa, Daisuke Yumitori

    Meteoritics and Planetary Science   2024.3

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Wiley  

    DOI: 10.1111/maps.14149

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  • Deuterium Content and Site Occupancy in Iron Sulfide at High Pressure and Temperature Determined Using In Situ Neutron Diffraction Measurements Reviewed International coauthorship International journal

    Sumith Abeykoon, Christopher Howard, Serena Dominijanni, Lisa Eberhard, Alexander Kurnosov, Daniel J. Frost, Tiziana Boffa Ballaran, Hidenori Terasaki, Tatsuya Sakamaki, Akio Suzuki, Eiji Ohtani, Asami Sano‐Furukawa, Jun Abe

    Journal of Geophysical Research: Solid Earth   128 ( 9 )   2023.9

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Geophysical Union (AGU)  

    Abstract

    We have performed in situ time‐of‐flight neutron diffraction experiments to examine the uptake of deuterium in iron monosulfide at pressures up to 11.4 GPa and temperatures to 1300 K. A D2 fluid was formed in the experiments through the decomposition of ND3BD3, resulting in an oxygen fugacity of approximately 1.2 log units below the iron‐wüstite buffer. Deuterium positions and site occupancies were determined in FeS V, using Rietveld refinements of the powder neutron diffraction patterns. Our structural model indicates that two normally unoccupied sites in the P63/mmc FeS V structure, at Wyckoff positions 6h and 4f, are partially occupied by D atoms, with the latter being more dominant. The deuterium content Dx in FeSDX increases with both pressure and temperature over the experimental conditions explored, from 0.126 (14) at 2.3 GPa and 787 K to 1.20 (16) at 9.7 GPa and 1300 K. The unit‐cell volume expansion per deuterium atom is 1.53 ± 0.16 Å3 at 6.9 GPa and 960 K, which is smaller than that determined for metallic iron phases at similar conditions. The variation in unit‐cell volume indicates that most deuterium is lost from FeS V upon temperature quenching at high‐pressures. By fitting the obtained FeS V deuterium site occupancies to a thermodynamic model, estimates for the hydrogen contents of iron monosulfide at conditions and oxygen fugacities consistent with the base of the cratonic lithosphere can be made. This results in values in the range of 1,700–2,700 ppm, which contribute to approximately 2–3 ppm hydrogen in the bulk mantle.

    DOI: 10.1029/2023jb026710

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  • Density Measurements of Fe-Ni-S Liquids at High Pressure Reviewed

    Satoru Urakawa, Hidenori Terasaki, Syun-pachi Kishimoto, Naonori Inoue, Yuta Shimoyama, Yusaku Takubo, Akihiko Machida

    SPring-8/SACLA Research Report   11   218 - 220   2023.8

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    Language:English  

    DOI: 10.18957/rr.11.4.218

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Books

  • 高圧力の科学・技術事典

    入舩 徹男, 舟越 賢一, 近藤 忠, 関根 利守, 清水 克哉, 長谷川 正, 保科 貴亮, 木村 佳文, 加藤 稔, 松木 均( Role: Contributor ,  94-95;172-173)

    朝倉書店  2022.11  ( ISBN:9784254102970

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    Total pages:17,458p   Language:Japanese Book type:Dictionary, encyclopedia

    CiNii Books

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  • 基礎地学実験

    廣野哲郎, 佐伯和人, 寺崎英紀, 境家達弘, 横田勝一郎, 松尾太郎, 芝井広( Role: Contributor ,  11-18)

    学術図書出版社  2020.3  ( ISBN:9784780608236

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    Total pages:i, 42p   Language:Japanese Book type:Textbook, survey, introduction

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  • Magmas Under Pressure: Advances in High-Pressure Experiments on Structure and Properties of Melts

    Terasaki, H, K. Nishida( Role: Contributor ,  pp237–260)

    Elsevier  2018.6 

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  • Deep Earth: Physics and Chemistry of the Lower Mantle and Core

    H. Terasaki, R.A. Fischer( Role: Edit)

    AGU/Wiley  2016.4 

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Presentations

  • 寺崎英紀、森岡康、河口沙織、近藤忠、櫻井萌、黒阪紘志、米田明、紙名宏幸

    レーザー加熱式DACを用い, 線吸収法によるNi固体, 液体の密度測定

    日本高圧力学会  2024.11.14 

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    Event date: 2024.11.13 - 2024.11.15

    Language:Japanese   Presentation type:Poster presentation  

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  • Experimental study on trapped melt in iron meteorite: Implication for the planetesimal core solidification

    H. Terasaki, S. Matsubara, T. Yoshino, G. D. Bromiley, I. Butler

    Japan Geoscience Union meeting 2024  2024.5.27 

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    Event date: 2024.5.26 - 2024.5.31

    Language:English   Presentation type:Oral presentation (general)  

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  • Wetting property of Fe–S melt in solid core: Implication to core crystallization process in planetesimals

    S. Matsubara, H. Terasaki, T. Yoshino, S. Urakawa, D. Yumitori

    Workshop on Interiors of planetesimals and terrestrial planets 

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    Event date: 2023.11.28

    Language:English   Presentation type:Oral presentation (general)  

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  • Possibility of percolative core formation in planetesimals

    H. Terasaki, T. Yoshino, G. D. Bromiley, I. Butler, K. Kobayashi, S. Matsubara, T. Miura

    Workshop on Interiors of planetesimals and terrestrial planets 

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    Event date: 2023.11.28

    Language:English   Presentation type:Oral presentation (general)  

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  • レーザー加熱式ダイヤモンドアンビルセルを用いたX線吸収法によるFeSの密度測定

    森岡康, 寺崎英紀, 紙名宏幸, 鶴岡椋, 近藤忠, 米田明, 櫻井萌, 河口沙織

    日本鉱物科学会2023年年会 

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    Event date: 2023.9.14 - 2023.9.16

    Language:Japanese   Presentation type:Poster presentation  

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Awards

  • Fellow

    2023.10   Mineralogical Society of America  

    Hidenori Terasaki

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  • 総長顕彰(研究部門)

    2015.7   大阪大学  

    寺崎 英紀

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  • Excellence in Peer Review

    2014.6   Physics and Earth Planetary Interiors, Elsevier  

    Hidenori Terasaki

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  • young scientist award

    2008.11   The Japan Society of High Pressure Science and Technology  

    Hidenori Terasaki

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  • young scientist award

    2008.9   Japan Association of Mineralogical Sciences  

    Hidenori Terasaki

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Research Projects

  • Elasticity associated with the iron spin transition by means of GHz ultrasonics

    Grant number:21H01179  2021.04 - 2025.03

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

    米田 明, 近藤 忠, 寺崎 英紀, 山崎 大輔

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    Grant amount:\17160000 ( Direct expense: \13200000 、 Indirect expense:\3960000 )

    本研究経費を得て、以下に示す投資を行うことができた。
    ①本年度に岡山大学からGHz測定装置を大阪大学に移設し、大阪大学で大学院生と共同して研究を進める体制を整えた。②金属製の中型キャビネットを購入しGHz音速測定部を内部に置くことで外来ノイズの遮蔽を行った。この結果、従前に見られたスパイク状のノイズがほとんど観測されなくなった。③低ノイズのプレアンプを導入し、さらに、④高速電子スイッチをファンクション発振器で制御するシステムを構築し、シグナルのSN比の向上を実現した。
    この他にも、⑤ZnO圧電素子に対するインジウム電極の形状の改善と圧着状態の解明、⑥バッファロッド用基板結晶と白金電極の間に接着性改善のためのクロムのプレスパッタリング導入、など研究を安定的に進展させるための技術開発を行った。
    このような技術開発をもとにMgOの測定を行った。MgOは先行研究が多く、GHz測定の信頼性確認に最適の物質である。同一セルで初めてP波とS波の測定に成功した。圧力はSPring-8でのX線格子定数の測定から0.6GPaと決定された。試料の厚さは、回収後のガスケットの厚さから見積もった。最終的に得られたP波速度とS波速度比は1.63と先行研究と調和的結果が得られた。
    これらの成果を踏まえて、フェロペリクレースを合成しスピン転移での音速測定実施の機運が熟したといえる。そのために向けて大阪大学大学院生と協力し本研究課題達成のために邁進する。一方、前年度から継続中の鉄の音速測定も上記技術開発の結果を経て進展中である。これらの結果を含めてこれまで独自開発を行ってきたGHzーDAC音速法の技術論文を早期投稿する。

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  • Study of Martian core structure based on density and sound velocity measurements

    Grant number:20H02008  2020.04 - 2024.03

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

    寺崎 英紀, 米田 明, 鎌田 誠司

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    Grant amount:\18070000 ( Direct expense: \13900000 、 Indirect expense:\4170000 )

    本課題では、ダイヤモンドアンビルセル(DAC)を用いた密度と弾性波速度の複合測定により、Fe-Ni合金融体の密度と弾性特性を決定し、火星コア条件でのコア物質の圧縮曲線、状態方程式の決定を目指している。最近、InSight探査機による火星地震データから火星の内部構造が報告された。この最新の内部構造モデルから火星コア組成を制約するには、コア条件でのFe-S融体の状態方程式決定が不可欠となる。
    本研究では、密度測定に試料のX線透過率から密度を導出するX線吸収法を用い、弾性波速度測定にGHz超音波パルス干渉法を用いている。
    2021年度の密度測定では、両面レーザー斜入射加熱による高温高圧下の測定を本格的に実施した。Ni試料では、24 GPaまでの1600-1750 Kでの圧縮曲線を得ることができた。同時にX線回折からNiの密度を決定し、吸収法による密度と比較し整合的な結果が得られた(高圧討論会で発表)。次にFe-SとFe3C試料について測定をおこなった。液体での測定を目指すため、鉄合金試料はアルミナ単結晶圧媒体を用いて、10 GPa, 1750 KまでのX線透過率測定を行った。またX線吸収法と外熱式DACを用いた10 GPaまでの液体Gaの密度結果をHigh Pressure Research誌に発表した(Tsuruoka, Terasaki et al. 2021)。
    2021年度の弾性波速度測定では、共同研究者の米田博士によりDACを用いGHz超音波法の技術開発およびFe試料の測定を実施した。技術開発としては、低ノイズプレアンプと高速スイッチを用いることで、シグナルのSN比を向上させることができた。Fe試料の弾性波速度測定は、X線吸収測定で試料厚みを求め、6 GPaまでの圧力条件で弾性波速度を決定した。また抵抗ヒーターを用いた外熱法を採用し、高温高圧下での弾性波速度測定を開始した。

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  • Density measurements and structure of Fe and Fe-light elements alloy liquid

    Grant number:16K13902  2016.04 - 2019.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    Kamada Seiji, TERASAKI Hidenori

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    Grant amount:\3640000 ( Direct expense: \2800000 、 Indirect expense:\840000 )

    The Earth core is divided into liquid and solid cores. Densities of the cores were estimated seismologically and they are smaller than those of pure Fe, suggesting light elements exist in the cores. Therefore, it is very important to investigate densities of core materials. However, it is difficult to measure densities of liquid phases. In this study, I have measured densities of crystalline Fe under high pressures based on an X-ray absorption method in order to establish the method. The densities of Fe were obtained based on the X-ray absorption method and XRD. The densities of Fe based on the X-ray absorption method were consistent with those based on XRD. The difference were less than 2%. This suggests that the X-ray absorption method is a strong method to measure densities, especially liquid and amorphous.

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  • Structure and properties of the core-mantle materials

    Grant number:15H05828  2015.06 - 2020.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

    Suzuki Akio

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    Grant amount:\186550000 ( Direct expense: \143500000 、 Indirect expense:\43050000 )

    We investigated the structure and properties of deep-Earth materials. We developed experimental techniques in collaboration with the A01-3 Group, using high pressure-temperature ultrasonic methods to measure the elastic wave velocities of hydrous and non-hydrous phases in the Earth's mantle. Moreover, we measured the velocities of silicate glasses, magmas, and metallic liquids under high pressure and temperature to study the heterogeneous structure of the Earth's deep interior. We conducted melting experiments on mantle materials under high pressure, and developed a model that attribute the chemical heterogeneity of the mantle to the transportation of ultrabasic magmas. Through the investigation of the solubility of nitrogen in silicate minerals at high pressure, we revealed that stishovite contains higher amounts of nitrogen compared to other minerals. Based on these experimental results, we proposed a new model for stishovite-transported nitrogen in the Earth's mantle and core.

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  • Composition and dynamics of Mercury and Mars cores approached from physical properties under high pressures

    Grant number:26247089  2014.04 - 2018.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    Terasaki Hidenori, NISHIDA Keisuke, KONDO Tadashi, SUZUKI Akio, SASAKI Sho

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    Grant amount:\39520000 ( Direct expense: \30400000 、 Indirect expense:\9120000 )

    To clarify the core compositions of Mercury and Mars, elastic properties of liquid and solid Fe-alloys were investigated up to the planetary core conditions. We developed simultaneous sound velocity and density measurement system under high pressure and obtained relationship between sound velocity and density. It is found that the effect of alloying elements (C, S, Si, Ni) on the elastic properties of iron shows significantly different trend depending on alloying elements. Based on these results, we estimated the composition and conditions of the planetary cores.

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Class subject in charge

  • Physics of the Solid Earth (2024academic year) Second semester  - 木7~8

  • Physics of the Solid Earth Laboratory (2024academic year) Fourth semester  - 木5~8

  • Formation of the Earth (2024academic year) 1st semester  - 金5~6

  • Internal constitution of the Earth and planets 3 (2024academic year) Third semester  - 木3~4

  • Internal constitution of the Earth and planets 4 (2024academic year) Fourth semester  - 木3~4

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