Ogawa, Kuniyasu

写真a

Affiliation

Faculty of Science and Technology, Department of Mechanical Engineering (Yagami)

Position

Associate Professor

External Links

Profile 【 Display / hide

  • 熱・物質移動現象の計測と現象の解明を目指して研究を実施しています。 NMR・MRI(核磁気共鳴法、核磁気共鳴画像)を主な計測手法として用います。NMR/MRIは光では計測が困難な現象を見ることができ、水の空間分布や移動速度を計測できる特異性があります。 計測対象として、固体高分子形燃料電池(PEFC)の高分子膜内の含水量や、PEFC内での発電電流の空間分布があります。

Career 【 Display / hide

  • 1995.04
    -
    Present

    東京工業大学大学院総合理工学研究科(環境物理工学専攻) ,助手

  • 1998.04
    -
    Present

    東京工業大学工学部(機械科学科) ,助手

  • 2000.04
    -
    Present

    慶應義塾大学理工学部(機械工学科) ,専任講師

  • 2006.04
    -
    Present

    慶應義塾大学理工学部(機械工学科) ,助教授

  • 2007.04
    -
    Present

    慶應義塾大学理工学部(機械工学科) ,准教授

Academic Background 【 Display / hide

  • 1990.03

    Fukui University, Faculty of Engineering, 産業機械工学科

    University, Graduated

  • 1992.03

    Tokyo Institute of Technology, Graduate School, Division of Science and Engineeri, 機械物理工学

    Graduate School, Completed, Master's course

  • 1995.03

    Tokyo Institute of Technology, Graduate School, Division of Science and Engineeri, 機械物理工学

    Graduate School, Withdrawal after completion of doctoral course requirements, Doctoral course

Academic Degrees 【 Display / hide

  • 博士(工学), Tokyo Institute of Technology, Coursework, 1996.03

 

Research Areas 【 Display / hide

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Thermal engineering

Research Keywords 【 Display / hide

  • Measurement technique for observing heat and mass transfer phenomena

Research Themes 【 Display / hide

  • Measurement for observing heat and mass transfer phenomena using NMR/MRI technique, 

    1997.04
    -
    Present

 

Books 【 Display / hide

  • PEFCの内部現象・反応機構と評価・解析技術

    OGAWA KUNIYASU, S&T出版, 2015.08

    Scope: 第5章8節の「小型NMRコイルを用いたPEFCのPEM内含水量のNMR計測」

     View Summary

    「小型NMRコイルを用いたPEFCのPEM内含水量のNMR計測」に関して計測法の原理、装置、計測事例について記した。

  • ナノ・マイクロスケール熱物性ハンドブック

    日本熱物性学会編, 養賢堂, 2014.06

    Scope: 237-240

     View Summary

    NMR法を用いた溶液中の分子の拡散係数を計測する手法について解説し、計測事例を紹介した。

  • 見える伝熱工学

    OGAWA KUNIYASU, コロナ社, 2011.10

     View Summary

    伝熱工学の教科書。本書では,熱の移動や起きている現象を図によってイメージとしてつかみ,読者自身が熱の移動を見えるようになることを目指して編集した。このほか,数式の各項の意味を平易に示し,身近な伝熱現象の多くを例題として取り上げた。

  • 非侵襲・可視化技術ハンドブック

    OGAWA KUNIYASU, エヌ・ティー・エス, 2007.06

    Scope: 934-943

  • コンパクトMRI

    OGAWA KUNIYASU, 共立出版, 2004.11

    Scope: 61-102

     View Summary

    第4章 プロセス計測用MRI
    4.1 はじめに
    4.2 永久磁石を利用したMRI計測システムの利点と欠点
    4.3 クラスレート水和物内のガス貯蔵密度分布計測への適用
    4.4 航空機搭載用コンパクトMRI計測システム

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Papers 【 Display / hide

  • Enhanced water uptake in the longitudinal direction by shiitake mycelium in shiitake cultivation logs: water content distribution in logs measured by magnetic resonance imaging

    Ogawa K., Yashima T.

    Wood Science and Technology (Wood Science and Technology)  56 ( 1 ) 25 - 62 2022.01

    ISSN  00437719

     View Summary

    In the cultivation of shiitake mushrooms (Lentinula edodes), the farmer needs to know the time needed to water in order to adjust the water content of the logs. To study the enhanced water uptake in the longitudinal direction by shiitake mycelium in shiitake cultivation logs, six dried test logs (Quercus serrata, diameter of 38 to 48 mm, length of 110 to 118 mm) were used. Three test logs had shiitake mycelium grown on them, and the remaining three test logs had mold generated on them. Liquid water was supplied to the bottom surface of the test log which had its longitudinal direction along the line of gravity. Water content distribution in the logs was measured in chronological order using magnetic resonance imaging (MRI) with 1 Tesla. The calibration curve for converting the signal intensity of the MR image into the water content in the test log was determined by cutting the test log at 5-mm intervals and measuring the water content distribution using the mass method. Spatial distribution of the water content of the test log without shiitake mycelium depending on the cumulative water supply time was obtained, and the distribution shape was always concave corresponding to the exact solution of an unsteady one-dimensional diffusion equation with one diffusion coefficient. In the case of the test log in which shiitake mycelium grew, within a few hours after liquid water supply the water content increased in the whole region where shiitake mycelium grew, and the shape of the water content distribution in the longitudinal direction became convex. Based on observation of water penetration into logs by MRI and an optical microscope, it is believed that the driving force behind increased rise in liquid water in the longitudinal direction in the test log is the capillary force acting in vessels.

  • Enhanced water uptake in the longitudinal direction by shiitake mycelium in shiitake cultivation logs: increase in effective diffusion coefficient based on mass of liquid water uptake

    Ogawa K., Yashima T.

    Wood Science and Technology (Wood Science and Technology)  55 ( 5 ) 1237 - 1267 2021.09

    ISSN  00437719

     View Summary

    In the cultivation of shiitake mushrooms (Lentinula edodes), the farmer needs to know the time needed to water in order to adjust the water content of the logs. In this study, six test logs (Quercus serrata, diameter of 38–48 mm, length of 110–118 mm) were used, of which some were dried, some had shiitake mycelia grown on them, and some had mold generated on them. Liquid water was supplied to the test logs by placing the longitudinal direction of the test logs along the line of gravity and immersing the bottom of the test logs in water. Water uptake mass of the test logs was measured for 20 h. The effective diffusion coefficient, Deff, was calculated from the change in time of the water uptake mass using Fick's diffusion law. The Deff of test logs in which shiitake mycelium grew were 1.5–3.4 × 10–8 m2/s, and the values were 2.4–4.7 times higher than that for the dried log. On the other hand, the Deff of the moldy logs were 6.7–9.7 × 10–10 m2/s, which was 0.058–0.081 times that of dry test logs. Based on observation of water penetration into logs by magnetic resonance imaging (MRI) and an optical microscope, it is believed that the driving force behind liquid water rising in the longitudinal direction in the test log is the capillary force acting on a three-phase interface consisting of the inner wall surface of the vessel, liquid water and air.

  • MRI visualization of shiitake mycelium growing in logs in order to support shiitake mushroom log cultivation

    Ogawa K., Yashima T.

    Cellulose (Cellulose)  27 ( 16 ) 9605 - 9621 2020.11

    ISSN  09690239

     View Summary

    In order to correlate the yield and quality of shiitake mushrooms with the growth process of shiitake mycelium in logs over several years, a non-invasive visualization method using a magnetic resonance imaging (MRI) measurement system was developed. The MRI measurement system had a permanent magnet of 1.0 T magnetic field strength and a 110 mm air gap. The test logs in which grew the shiitake mycelium had a diameter of 43–48 mm, a length of 110–118 mm and a dried mass of 125–135 g. The log was inoculated on one cutting surface after being supplied water, and was placed in a thermostatic chamber (21 °C, about 75% humidity) for 69 days. The test log was observed by MRI, and MR images and T maps of shiitake mycelium growing over time were obtained. It was found that the shiitake mycelium has a T relaxation time constant longer than 150–200 ms, and its signal intensity in the MR images is smaller than that of water penetrated into a log. When making the MRI measurements, it is necessary to dry a log to water content of about 20% or less. In addition, a control log with mold was also observed by MRI. The shiitake mycelium can be distinguished from water penetrated into log and mold occurring in the log by combining the T —signal intensity map and clear recognition of a low-intensity region in MR images acquired at longer echo times. 1 1 1

  • Two-dimensional spatial distributions of the water content of the membrane electrode assembly and the electric current generated in a polymer electrolyte fuel cell measured by 49 nuclear magnetic resonance surface coils: Dependence on gas flow rate and relative humidity of supplied gases

    Ogawa K., Sasaki T., Yoneda S., Tsujinaka K., Asai R.

    Journal of Power Sources (Journal of Power Sources)  444 2019.12

    ISSN  03787753

     View Summary

    A PEFC (polymer electrolyte fuel cell) with a large power generation area of 140 mm × 160 mm has spatial distributions of the water content of the MEA (membrane electrode assembly) and the electric current produced that depend on the flow rate and relative humidity of the supplied gas. When 49 NMR (nuclear magnetic resonance) surface coils arranged in 7 rows × 7 columns were inserted into the PEFC, two-dimensional spatial distributions of the water content of the MEA and the electric current could be measured from the acquired NMR signals. The water content of the MEA was calculated from the intensity of the NMR signal, and the electric current distribution was determined by an inverse analysis that reproduces the spatial distribution of the resonance frequency of the NMR signals. The PEFC, which was supplied with hydrogen and oxygen at a high humidity of 80 %RH, generated electric power at 130 A over the whole area of the MEA. On the other hand, under a low humidity of 40 %RH and low flow rate conditions, the water content of the MEA became high in the midstream and downstream regions, and a high electric current was generated in these regions.

  • MRI visualization of shiitake mycelium growing in woodchip blocks used for shiitake mushroom cultivation

    Ogawa K., Yashima T.

    Magnetic Resonance Imaging (Magnetic Resonance Imaging)  58   90 - 96 2019.05

    ISSN  0730725X

     View Summary

    In order to eliminate woodchip blocks where unwanted fungi have grown and select only blocks where shiitake mycelium are growing well, there is a need to develop a visualization technique for shiitake mycelium growing in woodchip blocks, and MRI is an obvious candidate technique. From the results of measurements of the woodchip bed in a small bottle (26 mm inside diameter) where shiitake mycelium was growing, the T relaxation time constant immediately after inoculation was 77.9 ± 5.5 ms, and the value after about 10 to 20 days increased to 135.0 ± 9.8 ms (the increase rate was 73%). The T maps of the wood-chip block (130 mm length, 75 mm height and 55 mm thickness) in which shiitake mycelium grew were calculated from T weighted images measured by changing TR from 28 to 400 ms. From the T maps of time series, it was found that the shiitake mycelium extended from the right-hand side to the left-hand side of the woodchip block in a planar manner. Furthermore, in a woodchip block in which penicillium was generated, since the T relaxation time constant of only the shiitake mycelium became longer, it was possible to visualize the shiitake mycelium distinctly from penicillium. 1 1 1 1 1

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Papers, etc., Registered in KOARA 【 Display / hide

Reviews, Commentaries, etc. 【 Display / hide

  • NMRセンサーによるPEFCの含水量・発電電流の空間分布計測法

    小川 邦康、横内康夫

    燃料電池 9 ( 2 ) 43 - 50 2009.10

    Article, review, commentary, editorial, etc. (scientific journal), Joint Work

     View Summary

    固体高分子形燃料電池内にNMRセンサーを挿入して、高分子電解質膜内のの含水量と発電電流の空間分布を計測する方法を解説した。

  • NMR・MRI 計測 -計測原理と燃料電池,ハイドレート水和物の内部計測事例-

    OGAWA KUNIYASU

    J.HTSJ (日本伝熱学会)  47 ( 200 ) 27 - 39 2008.08

    Article, review, commentary, editorial, etc. (scientific journal), Single Work

     View Summary

    NMR/MRI計測技術の解説と、燃料電池、ハイドレートの内部計測結果の事例を示した。

  • 氷晶成長過程のMRI観察

    OGAWA KUNIYASU

    日本冷凍空調学会 83 ( 965 ) 149 - 155 2008.03

    Article, review, commentary, editorial, etc. (scientific journal), Single Work

     View Summary

    MRIの計測法および計測の特徴を解説し、、MRIによって凍結挙動を計測した場合の計測事例を示した。

  • NMR法による複雑体内部のマイクロスケール物質移動計測技術-燃料電池用高分子電解質膜への適用-

    OGAWA KUNIYASU

    日本機械学会誌 (日本機械学会)  111 ( 1071 ) 96 - 99 2008.02

    Article, review, commentary, editorial, etc. (scientific journal), Single Work

     View Summary

    NMRによって計測される緩和時定数と、ミクロスケールの分子運動との関係を用いて、高分子内の分子運動性を計測できることを解説し、計測事例を示した。

  • MRIによる伝熱計測

    OGAWA KUNIYASU

    計測と制御 45 ( 4 ) 370 - 375 2006.04

    Article, review, commentary, editorial, etc. (scientific journal), Single Work

     View Summary

    NMR・MRI計測法の解説と、伝熱工学の分野でのNMR/MRIの適用事例を示し、その計測法の特徴を示した。

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Presentations 【 Display / hide

  • 小型NMR コイルを用いた小型酸素濃縮器用ゼオライト充填層内の吸着水分量計測

    OGAWA KUNIYASU

    第19 回NMRマイクロイメージング研究会講演要旨集 (横浜) , 

    2016.08

    Oral presentation (general), NMRマイクロイメージング研究会

     View Summary

    小型NMR コイルを用いた小型酸素濃縮器用ゼオライト充填層内の吸着水分量を計測した。

  • 吸着式酸素濃縮器用ゼオライト充填層内の酸素・窒素濃度および温度分布の解析

    OGAWA KUNIYASU

    第52回日本伝熱シンポジウム講演論文集 (福岡) , 

    2016.06

    Oral presentation (general), 日本伝熱学会

     View Summary

    吸着式酸素濃縮器用ゼオライト充填層内の酸素・窒素濃度および温度分布の解析を行った。

  • 吸着式酸素濃縮器用ゼオライト充填層の酸素濃度と温度分布の数値解析

    OGAWA KUNIYASU

    日本機械学会熱工学コンファレンス2014 (東京) , 

    2014.11

    Oral presentation (general), 日本機械学会熱工学部門

  • 吸着式酸素濃縮器で用いられるゼオライト充填層内の水分吸着量の推算 熱電対で計測した層内温度分布から推算する方法

    小川邦康、稲垣洋介

    第51回日本伝熱シンポジウム講演論文集, 

    2014.05

    Oral presentation (general)

  • 燃料電池内高分子膜を小型表面コイルでNMR計測する際のSNR向上法

    小川邦康、拝師智之、青木勝

    第17回NMRマイクロイメージング研究会講演要旨集, 

    2013.08

    Oral presentation (general)

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Research Projects of Competitive Funds, etc. 【 Display / hide

  • ガス濃縮用吸着筒内の水分吸着量を小型NMRコイルで計測する装置と解析モデルの開発

    2013.04
    -
    2016.03

    日本学術振興会, Grant-in-Aid for Scientific Research, Research grant, Principal investigator

     View Summary

    小型酸素濃縮器の濃縮用吸着筒内の水分吸着量を小型NMRコイルで計測する装置の開発と解析モデルを開発する。

  • 燃料電池内の水生成・移動現象のNMR計測技術の開発

    2012.10
    -
    2015.03

    独立行政法人科学技術振興機構(JST), 研究成果展開事業(先端計測分析技術・機器開発プログラム), Commissioned research, Principal investigator

     View Summary

    128個の小型NMRセンサーを燃料電池内に挿入し、燃料電池内での水生成・移動現象を計測する技術を開発する。

  • MRI用小型永久磁石のための相変化蓄熱材を用いた±0.01℃温調システムの開発

    2012.04
    -
    2015.03

    慶應義塾大学 理工学部, Grant-in-Aid for Scientific Research, Research grant, No Setting

  • 燃料電池用電解質膜のメタノール透過性評価センサーの高スペクトル分離

    2011.08
    -
    2012.03

    慶應義塾大学 理工学部 小川 邦康, 科学技術振興機構研究成果展開事業 研究成果最適展開支援プログラムフィージビリティスタディ【FS】ステージ, Research grant, No Setting

     View Summary

    直接メタノール燃料電池(DMFC)では、燃料のメタノールが電解質膜を透過して、発電に寄与しないまま消費されてしまうという問題がある。本課題ではスペクトル分離性を高くしたNMRセンサー(核磁気共鳴法を利用したセンサー)を開発し、電解質膜のメタノール透過性を高い精度で評価できるシステムを試作した。

  • 繰返し荷重を受ける軟骨組織内での水分移動現象の動的 NMR・MRI併用計測

    2009.04
    -
    2012.03

    Grant-in-Aid for Scientific Research, Research grant, No Setting

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Intellectual Property Rights, etc. 【 Display / hide

  • 核磁気共鳴法を用いた培地内の菌糸計測装置

    Date applied: 2018-152288  2018.08 

    Patent, Single

  • 測定解析装置、燃料電池システム及び測定解析方法

    Date applied: 2017-177216  2017.09 

    Patent, Joint

  • セルモデル、計測システム及び同時計測方法

    Date applied: 2015-022129  2015.02 

    Patent, Joint

  • 核磁気共鳴法を用いた燃料電池用信号検出装置

    Date applied: 特願2014-25860  2014.01 

    Patent, Single

Awards 【 Display / hide

  • 日本機械学会賞(論文)

    小川 邦康, 2001.04, 磁気共鳴イメージングによる温度・流れ場の同時計測法の開発

  • 日本伝熱学会学術賞

    小川 邦康, 1999.05, 極短パルスプラズマによるメタン・水からのメタノール直接合成

  • 日本伝熱学会奨励賞

    小川 邦康, 1998.05, 放電によるメタン改質の研究

 

Courses Taught 【 Display / hide

  • PROJECT LABORATORY IN MECHANICAL ENGINEERING

    2022

  • INTRODUCTION TO THERMODYNAMICS

    2022

  • INDEPENDENT STUDY ON SCIENCE FOR OPEN AND ENVIRONMENTAL SYSTEMS

    2022

  • GRADUATE RESEARCH ON SCIENCE FOR OPEN AND ENVIRONMENTAL SYSTEMS 2

    2022

  • GRADUATE RESEARCH ON SCIENCE FOR OPEN AND ENVIRONMENTAL SYSTEMS 1

    2022

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Courses Previously Taught 【 Display / hide

  • 機械系のための電気・電子回路

    Keio University

    2014.04
    -
    2015.03

    Autumn Semester, Lecture, Within own faculty, 2h, 50people

    アナログ回路、デジタル回路

  • 熱・物質移動論

    Keio University

    2014.04
    -
    2015.03

    Autumn Semester, Lecture, Within own faculty, 2h, 100people

    伝熱工学、熱工学

  • 理工学基礎実験

    Keio University

    2014.04
    -
    2015.03

    Spring Semester, Laboratory work/practical work/exercise, Within own faculty, 3h, 120people

    実験

  • プロダクション・エンジニアリング

    Keio University

    2014.04
    -
    2015.03

    Spring Semester, Laboratory work/practical work/exercise, Within own faculty, 3h, 40people

    アームロボット、H8マイコン、プログラミング

  • エネルギー変換工学

    Keio University

    2014.04
    -
    2015.03

    Spring Semester, Lecture, Within own faculty, 3h, 140people

    熱力学、サイクル、仕事、熱効率

Educational Activities and Special Notes 【 Display / hide

  • 見える伝熱工学

    2011.10

    , Development of Textbook and Teaching Material

     View Details

    熱の移動や起きている現象を図によってイメージとしてつかみ,学生自身が熱の移動を見えるようになることを目指して編集した。このほか,数式の各項の意味を平易に示し,身近な伝熱現象の多くを例題として取り上げた。

 

Memberships in Academic Societies 【 Display / hide

  • 社団法人日本設計工学会, 

    2002.06
    -
    2006.05
  • 日本熱物性学会, 

    2002.05
    -
    Present
  • 社団法人 日本伝熱学会, 

    1996.05
    -
    Present
  • 社団法人 日本機械学会, 

    1992.04
    -
    Present

Committee Experiences 【 Display / hide

  • 2013.04
    -
    2014.11

    熱工学部門熱工学コンファレンス 委員, 社団法人日本機械学会

  • 2010.09
    -
    2011.11

    シンポジウム実行委員会 委員, 日本熱物性学会

  • 2009.05
    -
    2016.04

    燃料電池部門委員会 委員, 社団法人 自動車技術会

  • 2008.09
    -
    2009.11

    シンポジウム実行委員会 委員, 日本熱物性学会

  • 2007.05
    -
    2009.05

    評議員, 社団法人 日本伝熱学会

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