"High-Temperature Superconductors: Occurrence, Synthesis and Applications," Nova science publisher, 2018.4, "Chapter 17. Strong Magnetic Field Generation by Superconducting Bulk Magnets Using Various Types of Refrigerators and Considering an Efficient Magnetization (pp.369-386)"を担当
K. Yokoyama, T. Oka, "A Numerical Analysis of Pulsed-Field Magnetization Characteristics of REBCO Bulk Magnets When Using Various Soft-Iron Yokes," IEEE Transactions on Applied Superconductivity, Vol.33, No.5, Art.No. 6800705, 2023.8
K. Takemura, K. Sudo, R. Dorget, J. L. Dadiel, M. Sakafuji, K. Yokoyama, T. Oka, M. Murakami, N. Sakai, "Pulsed Field Magnetizing Behavior of Gd-Ba-Cu-O Bulk Superconductor With a Superconducting Joint," IEEE Transactions on Applied Superconductivity, Vol.33, No.5, Art.No. 6800305, 2023.8
K. Yokoyama, T. Oka, "A Numerical Evaluation of Magnetizing Characteristic of Bulk Magnet Excited by Pulsed-Field Magnetization With Different Shaped Soft-Iron Yokes," IEEE Transactions on Applied Superconductivity, Vol.32, No.6, Art.No. 6801205, 2022.9
M. Takahashi, S. Kikuchi, N. Inoue, N. Sakai, M. Murakami, K. Yokoyama, T. Oka, T. Nakamura, "NMR Relaxometry Using Outer Field of Single-Sided HTS Bulk Magnet Activated by Pulsed Field," IEEE Transactions on Applied Superconductivity, Vol.32, No.6, Art.No. 4602404, 2022.9
K. Yokoyama, T. Oka, "Influence of Soft-Iron Yoke Thickness on the Magnetizing Characteristics of a Bulk Magnet Excited by Pulsed-Field Magnetization," IEEE Transactions on Applied Superconductivity, Vol.32, No.4, Art.No. 4600105, 2022.6
J. L. DadielK, N. Sakai. K. Yokoyama, K. Takemura, T. Oka, J. Noudem, M. Muralidhar, M. Murakami, "Field-Trapping Performance of Drilled MgB2 Bulk Superconductor Embedded With Bi-In-Sn Alloy and Al-Rod Using Pulse-Field Magnetization Processes," IEEE Transactions on Applied Superconductivity, Vol.32, No.4, Art.No. 3800106, 2022.6
M. Takahashi, S. Kikuchi, N. Inoue, N. Sakai, M. Murakami, K. Yokoyama, T. Oka, T. Nakamura, "NMR Relaxometry Using Outer Field of Single-Sided HTS Bulk Magnet Activated by Pulsed Field," IEEE Transactions on Applied Superconductivity, Vol.32, No.6, Art.No. 4602404, 2022.6
K. Yokoyama, T. Oka, "Investigation of the Magnetizing Performance of a REBCO Bulk Magnet Excited by Pulsed Field Magnetization Using Cross-Shaped Iron Yokes," IEEE Transactions on Applied Superconductivity, Vol.31, No.5, Art.No. 4900505, 2021.8
K. Yokoyama, T. Oka, "Influence of the Shape of Soft-iron Yoke on Trapped Field Performance of HTS Bulk," IEEE Transactions on Applied Superconductivity, Vol.30, No.4, Art.No. 6800105, 2020.6
K. Yokoyama, T. Oka, "Enhancement of trapped field of REBCO bulk in a desktop-type magnet system," Engineering Research Express, Vol. 1, Art.No. 025053, 2019.12
K. Yokoyama, T. Oka, "Improvement of Trapped Magnetic Field of a REBCO Bulk Magnet Activated by Pulsed Field Magnetization in a High-Cooling Power Two-Stage GM-Type Refrigerator," IEEE Transactions on Applied Superconductivity, Vol.29, No.5, Art.No. 6801305, 2019.8
T. Oka, A. Takeda, H. Oki, J. Ogawa, S. Fukui, J. Scheiter, W. Hasler, K. Yokoyama, K. Yamanaka, L. Dadiel, M. Miryala. N. Sakai, M. Murakami, J. Noudem,"Study on Magnetic Flux Dissipation and Field-Trapping Performance of HTS Bulk-Shaped Magnesium Diboride in Pulse-Field Magnetizing Processes," IEEE Transactions on Applied Superconductivity, Vol. 29, No.5, Art.No. 6802606, 2019.8
K. Yokoyama, A. Katsuki, A. Miura, T. Oka, "Magnetizing Performance Evaluation of HTS Bulk Magnet Using a 12 K Refrigerator With High Cooling Capacity," IEEE Transactions on Applied Superconductivity, Vol.29, No.3, Art.No. 8800506, 2019.4
T. Oka, A. Takeda, K. Shimizu, K. Higa, S. Tsunoda, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, T. Nakamura, "Feasible Applications of Bulk HTS Magnets and Magnetic Field-Capturing Characteristics in Their Activation Processes," IEEE Transactions on Applied Superconductivity, Vol.29, No.3, Art.No. 6800706, 2019.4
K. Yokoyama, A. Katsuki, A. Miura, T. Oka, "Comparison of Magnetizing Characteristics of Superconducting Bulk Magnet Cooled by Stirling and GM Refrigerators During Pulsed Field Magnetization," IEEE Transactions on Applied Superconductivity, Vol.28, No.2, Art.No. 6800404, 2018.6
K. Yokoyama, A. Katsuki, A. Miura, T. Oka, "Enhancement of Trapped Magnetic Field Using a Large-Size REBCO Bulk in a Desktop Type Superconducting Bulk Magnet," IEEE Transactions on Applied Superconductivity, Vol.28, No.2, Art.No. 6800304, 2018.4
T. Oka, K. Ichiju, S. Sasaki, J. Ogawa, S. Fukui, T. Sato, M. Ooizumi, K. Yokoyama, S. Aoki, N. Ohnishi, "Magnetic Separation Using HTS Bulk Magnet for Cs-Bearing Fe precipitates," J. Phys.: Conf. Ser., Vol. 897, Art.No. 012024, 2017.9
T. Oka, K. Ichiju, S. Sasaki, J. Ogawa, S. Fukui, T. Sato, M. Ooizumi, K. Yokoyama, S. Aoki, N. Ohnishi, "Magnetic Separation Using HTS Bulk Magnet for Cs-Bearing Fe precipitates," J. Phys.: Conf. Ser., Vol. 897, Art.No. 012024, 2017.9
T. Oka, K. Hara, A. Takeda, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, A. Murakami, "Magnetic flux invasion in REBCO bulk magnets with varying pre-magnetized flux distributions in multiple-PFM processes," J. Phys.: Conf. Ser., Vol. 871, Art.No. 012049, 2017.7
K. Yokoyama, K. Eranda, Y. Zhao, A. Katsuki, A. Miura, T. Oka, "Influence of Artificial Defects on Trapped Field Performance in a Superconducting Bulk Magnet," J. Phys.: Conf. Ser., Vol. 871, Art.No. 012050, 2017.7
T. Miyazaki, S. Fukui, J. Ogawa, T. Sato, T. Oka, J. Scheiter, W. Hasler, E. Kulawansha, Z. Yuanding, K. Yokoyama, "Pulse-Field Magnetization for Disc-Shaped MgB2 Bulk Magnets," IEEE Transactions on Applied Superconductivity, Vol.27, No.2, Art.No. 6800504, 2017.6
T. Oka, Y. Takahashi, S. Yaginuma, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, T. Nakamura,"Uniform magnetic field between face-to-face settled HTS bulk magnets combining concave and convex magnetic field distributions," Physics Procedia, Vol.81, pp.45-48, 2016.5
K. Yokoyama, E. Kulawansha, Z. Yuanding, T. Oka,"Influence of the position of a small hole on the trapped field performance in a holed superconducting bulk magnet," IEEE Transactions on Applied Superconductivity, Vol.26, No.3, Art.No. 8201704, 2016.2
T. Oka, K. Hara, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, A. Murakami, M. Langer,"Selective magnetic field invasion into HTS bulk magnets in pulse field magnetizing processes," IEEE Transactions on Applied Superconductivity, Vol.26, No.3, Art.No. 6800504, 2016.2
K. Yokoyama, E. Kulawansha, Z. Yuanding, T. Oka,"Development of a desktop type superconducting bulk magnet," IEEE Transactions on Applied Superconductivity, Vol.26, No.4, pp.1-4, 2016.1
T. Oka, Y. Takayanagi, S. Machida, K. Ichiju, S. Fukui, J. Ogawa, T. Sato, M. Ooizumi, M. Tsujimura, K. Yokoyama,"Magnetic Separation for Recovering Ni-Compounds from Plating Waste with Use of HTS Bulk Magnets," IEEE Transactions on Applied Superconductivity, Vol.26, No.4, Art.No. 3700204, 2016.1
T. Oka, T. Miyazaki, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, M. Langer, "Magnetization Behavior of RE123 Bulk Magnets Bearing Twin Seed-Crystals in Pulsed Field Magnetization Processes," Superconductor Science and Technology, Vol. 29, No. 2, pp. 50-53, 2015.12
K. Yokoyama, R. Igarashi, R. Togasaki, T. Oka, "Pulsed field magnetization characteristics of a holed superconducting bulk magnet," Physica C, Vol. 518,pp.117-121, 2015.11
T. Oka, H. Ota, T. Shimoda, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, A. Murakami, M. Langer, "Preferential Magnetic Flux Invasion and Heat Generation Owing to Macrostructure in HTS Bulk Magnets in Pulse Field Magnetization Processes," IEEE Transactions on Applied Superconductivity, Vol. 25, No. 3, Art.No. 6800904, 2015.6
K. Yokoyama, R. Igarashi, R. Togasaki, T. Oka, "Improvement of the trapped field performance of a holed superconducting bulk magnet," IEEE Transactions on Applied Superconductivity, Vol. 25, No. 3, Art.No. 6800804, 2015.6
K. Yokoyama, T. Tsukui, H. Mita, N. Tsubonoya, T. Oka, "Investigation of the Flux Flow-inhibiting Effect of a Hole-opened Superconducting Bulk Magnet," Physics Procedia, Vol.58, pp.302-305, 2014.10
T. Oka, Y. Yamada, T. Horiuchi, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, M. Langer, "Pulsed-field Invasion to HTS Bulk Magnets Grown from Two Seeds with Varied Seed-crystal Positions and Numbers," Physics Procedia, Vol.58, pp.74-77, 2014.10
T. Oka, H. Fukazawa, N. Yoshizawa, Y. Takayanagi, J. Ogawa, S. Fukui, T. Sato, M. Ooizumi, M. Tsujimura, K. Yokoyama, "Magnetic separation technique using high temperature superconducting bulk magnets and application to plating liquid waste treatment",J. Jpn. Soc. Powder Powder Metallurgy, Vol.61, No. S1, pp.S164-S166,2014.5
T. Oka, H. Fukazawa, S. Fukui, J. Ogawa, T. Sato, M. Ooizumi, M. Tsujimura, K. Yokoyama, "Collection of Ni-Bearing Materal from Electroless Plating Waste by Magnetic Separation with HTS Bulk Magnet",Physica C: Superconductivity and its applications, Vol.496, pp.58-62,2014.1
T. Oka, Y. Yamada, D. Ishiduka, J. Ogawa, S. Fukui,T. Sato, K. Yokoyama, M. Langer, "Magnetic Field-Trapping Properties of Melt-Processed Y123 Bulk Superconductors Activated by Pulsed-Field Magnetizing Method", Transactions of the Materials Research Society of Japan, Vol.38, No.2, pp.273-277, 2013.12
T. Oka, E. Hirayama, T. Kanai, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, "Strong Magnetic Field Generators Containing HTS Bulk magnets and Compact Refrigerators and Their Field-Trapping Performances", IEEE Transactions on Applied Superconductivity, Vol.24, No.3, 2013.10
K. Yokoyama, T. Tsukui, H. Mita, N. Tsubonoya, T. Oka, "Experimental Verification of the Magnetic Flux Penetration Property and a Flux Flow Inhibition Effect of a Superconducting Bulk Magnet with Small Holes", Physics Procedia, Vol.45, pp.261-264, 2013.5
T. Oka, D. Ishiduka, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, A. Murakami, H. Stopfel, "Flux-Invading Behaviors and Temperature Changes in Dy123 Bulk Magnet in Iterative Pulse Field Magnetization Process", Physica C, Vol. 494, pp.46-49, 2013.4
K. Yokoyama, T. Oka, N. Kondo, S. Hosaka, "Pulsed-field magnetization of a bulk superconductor with small holes", Physica C, Vol. 484, pp.343-347, 2013.1
T. Oka, T. Kimura, D. Mimura, H. Fukazawa, S. Fukui, J. Ogawa, T. Sato, M. Ooizumi, K. Yokoyama, M. Tsujimura, T. Terasawa, "Magnetic precipitate separation for Ni plating waste liquid using HTS bulk magnets", Physica C, Vol. 484, pp.325-328, 2013.1
K. Yokoyama, T. Oka, K. Noto, "Pulsed-Field Magnetization of a Superconducting Bulk Magnet After Field Cooling Using a Permanent Magnet", IEEE Trans. on Applied Superconductivity, Vol. 22, No.3, pp.4700104(4pages) , 2012.6
K. Yokoyama, T. Oka, K. Noto, "Improvement of a magnetization method on a small-size superconducting bulk magnet system", Physica C, Vol. 471, No.21-22, pp.901-904, 2011.11
T. Oka, H. Seki, T. Kimura, D. Mimura, S. Fukui, J. Ogawa, T. Sato, M. Ooizumi, H. Fujishiro, H. Hayashi, K. Yokoyama, C. Stiehler, "Magnetic separation technique for groundwater by five HTS melt-processed bulk magnets arranged in a line", Physica C, Vol. 471, No.21-22, pp.1506-1510, 2011.11
K. Yokoyama, T. Oka, K. Noto, "Performance of Trapped Magnetic Field in Superconducting Bulk Magnets Activated by Pulsed Field Magnetization", IEEE Trans. on Applied Superconductivity, Vol. 21, No.3, pp.1657-1660, 2011.6
T. Oka, H. Seki, S. Fukui, J. Ogawa, T. Sato, K. Yokoyama,"Evaluation of Pulsed-Field Magnetization on a Superconducting Bulk Magnet System Using a 13 K Refrigerator", IEEE/CSC & ESAS European Superconductivity News Forum (ESNF), No.15, pp.1-4, 2011.1
K. Yokoyama, T. Oka, K. Noto, "Development of a Small-Size Superconducting Bulk Magnet System Using a 13 K Refrigerator", IEEE Trans. Appl. Superconduct., vol.20, pp.973-976, 2010.6
K. Yokoyama, T. Oka, K. Noto, "Evaluation of magnetic force distribution on a pair of superconducting bulk magnets", Physica C, vol.470, pp.1201-1206, 2010.5
T. Oka, K. Tanaka, T. Kimura, D. Mimura, S. Fukui, J. Ogawa, T. Sato, M. Ooizumi, K. Yokoyama, M. Yamaguchi, "Magnetic separation technique for environmental water purification by strong magnetic field generator loading HTS bulk magnets", Physica C, Vol.470, pp.1799-1803, 2010.5
K. Yokoyama, T. Oka, K. Noto, "Development of a small-size superconducting bulk magnet system especially designed for a pulsed-field magnetization", Physica C, vol.469, pp.1282-1285, 2009.10
K. Yokoyama and T. Oka, "Improvement of trapped field performance by combining a holed REBCO bulk with a cross-shaped soft-iron yoke," 36th International Symposium on Superconductivity (ISS2023), AP-4-1-INV, Takina Wellington Convention and Exhibition Centre, New Zealand, 2023.11
T. Oka, K. Takemura, M. Sakafuji, A. Nair, L. Dadiel, N. Sakai, M. Murakami, M. Takahashi, T. Nakamura, T. Nakano, K. Yokoyama, "HTS Bulk Magnet Systems Employing Cryocoolers and The Latest Application Candidates," 36th International Symposium on Superconductivity (ISS2023), WB-4-4, Takina Wellington Convention and Exhibition Centre, New Zealand, 2023.11
T. Oka, K. Takemura, M. Sakafuji, A. Nair, L. Dadiel, N. Sakai, M. Murakami, M. Takahashi, T. Nakamura, T. Nakano, K. Yokoyama, "HTS Bulk Magnets Cooled by a Refrigerator and Latest Efforts for Their Application Research," International workshop on processing and applications of superconducting bulk material (PASREG2023), B-IV, Carn, France, 2023.8-9
K. Yokoyama and T. Oka, "A numerical analysis of pulsed-field magnetization characteristic of REBCO bulk magnet when using various soft-iron yokes," 2022 Applied Superconductivity Conference (ASC2022), 3MPo1B-04, Honolulu HW, USA, 2022.10
K. Takemura, K. Sudo, R. Dorget, L. Dadiel, M. Sakafuji, K. Yokoyama, T. Oka, M. Murakami, N. Sakai, "Pulsed field Magnetizing behavior of Gd-Ba-Cu-O bulk superconductor with a superconducting joint," 2022 Applied Superconductivity Conference (ASC2022), 1MOr1B-06, Honolulu HW, USA, 2022.10
M. Asaad, C. YU, K. Yokoyama, T. Oka, "Magnetizing performance evaluation of bulk magnet activated by pulsed-field magnetization when using different soft-iron yokes," 34th International Symposium on Superconductivity (ISS2021), WB5-5, online, 2021.11-12
K. Yokoyama and T. Oka, "A numerical evaluation of magnetizing characteristic of bulk magnet excited by pulsed-field magnetization with different shaped soft-iron yokes," 27th International Conference on Magnet Technology (MT27), THU-PO3-612-01, Hybrid Conference: On-site (Fukuoka, Japan) and On-line, 2021.11
K. Yokoyama and T. Oka, "Numerical evaluation of magnetizing characteristics of REBCO bulk magnet excited by pulsed-field magnetization with various soft-iron yokes," International workshop on processing and applications of superconducting bulk material (PASREG2021), T-35, Hybrid event (Shanghai, China), 2021.11
K. Yokoyama and T. Oka, "Influence of soft-iron yoke thickness on the magnetizing characteristics of a bulk magnetexcited by pulsed-field magnetization," 15th European Conf. Appl. Supercond. (EUCAS2021), 160, online, 2021.9
K. Yokoyama and T. Oka, "Pulsed field magnetization of GdBCO bulk using various shaped soft-iron yokes," 2020 Applied Superconductivity Conference (ASC2020), Wk2LPo1E-06, online, 2020.10-11
K. Yokoyama and T. Oka, "Trapped field evaluation of ring-shaped GdBCO bulk magnetexcited by pulsed field magnetization," 10th ACASC / 2nd Asian-ICMC / CSSJ joint conference, 8P-10, Okinawa, 2020.1
C. CAO, K. Yokoyama and T. Oka, "Magnetizing performance evaluation of GdBCO bulkmagnetusingdifferent shapes of soft-iron yoke," 10th ACASC / 2nd Asian-ICMC / CSSJ joint conference, 8P-09, Okinawa, 2020.1
K. Yokoyama and T. Oka, "Pulsed field magnetization of GdBCO bulk using a ring-shaped soft-iron yoke," 32th International Symposium on Superconductivity (ISS2019), WBP1-11, Kyoto, Japan, 2019.12
T. Oka, H. Oki, K. Yamanaka, Y. Hosaka, K. Shimizu, J. Ogawa, S. Fukui, K. Yokoyama, N. Sakai, M. Miryala, M. Murakami, "Magnetic Flux Trapping and Flux Jumps in Pulsed Field Magnetizing Processes in REBCO and Mg-B Bulk Magnets," 32th International Symposium on Superconductivity (ISS2019), WB6-3, Kyoto, Japan, 2019.12
K. Yokoyama and T. Oka, "Influence of the shape of soft-iron yoke on trapped field performance of HTS bulk," 65th International Conference of Magnet Technology (MT26), Wed-Mo-Po3.07-05, Vancouver, Canada, 2019.9
K. Yokoyama and T. Oka, "Magnetizing characteristic evaluation of REBCO bulk in PFM using different yokes," 14th European Conf. Appl. Supercond. (EUCAS2019), 1-MP-CU-S18, Glasgow, UK, 2019.9
K. Yokoyama and T. Oka, "Enhancement of trapped magnetic field using a large-size REBCO bulk in a desktop type superconducting bulk magnet," 11th International Workshop on Processing and Applications of Superconducting Bulk Materials (PASREG2019), P-05, Prague, Czech Republic, 2019.8
K. Yokoyama and T. Oka, "Improvement of trapped field of REBCO bulk activated by pulsed field magnetization with a large soft-iron yoke," 31th International Symposium on Superconductivity (ISS2018), WBP7-6, Tsukuba, Japan, 2018.12
T. Oka, K. Higa, S. Tsunoda, J. Ogawa, S. Fukui, N. Inoue, M. Miryala, M. Murakami, K. Yokoyama, T. Nakamura, "Generation of Uniform Magnetic Field between Face-to-Face HTS Bulk Magnets," 31th International Symposium on Superconductivity (ISS2018), WB5-3, Tsukuba, Japan, 2018.12
K. Yokoyama and T. Oka, "Improvement of trapped magnetic field of a REBCO bulk magnet activated by pulsed field magnetization in a high-cooling power dual-stage GM-type refrigerator," 2018 Applied Superconductivity Conference (ASC2018), 2MPo2A-02, Seattle WA, USA, 2018.10
T. Oka, J. Ogawa, S. Fukui, T. Sato, W. Hassler, H. Oki, A. takeda and K. Yokoyama, "Study on Magnetic Flux Dissipation and Field-Trapping Performance of HTS Bulk-Shaped Magnesium Diboride in Pulse-Field Magnetizing Processes," 2018 Applied Superconductivity Conference (ASC2018), 2MPo2D-09, Seattle WA, USA, 2018.10
K. Yokoyama and T. Oka, "Magnetic field generation by various types of HTS bulk magnet systems," The International Workshop on Material Analysis and Processing in Magnetic Fields (MAP8), Grenoble, France, 2018.6
K. Yokoyama, A. Katsuki, A. Miura, T. Oka, "Evaluation of trapped field characteristic of bulk magnet system using various type refrigerators," 30th International Symposium on Superconductivity (ISS2017), APP7-4, Tokyo, Japan, 2017.12
T. Oka, S. Sasaki, H. Sasaki, S. Fukui, J. Ogawa, T. Sato, T. Nakano, M. Ooizumi, M. Tsujimura, K. Yokoyama, "Collecting Ni-Sulfate Compound from Electroless Plating Waste by Magnetic Separation Technique with Use of HTS Bulk Magnets," 30th International Symposium on Superconductivity (ISS2017), WB7-2-INV, Tokyo, Japan, 2017.12
K. Yokoyama, A. Katsuki, A. Miura, T. Oka, "Magnetizing performance evaluation of HTS bulk magnet using a 12 K refrigerator with high cooling capacity," 10th International Workshop on Processing and Applications of Superconducting (RE)BCO Large Grain Materials (PASREG 2017), M11P, Tokyo, Japan, 2017.12
T. Oka, S. Sasaki, H. Sasaki, S. Fukui, J. Ogawa, T. Sato, T. Nakano, M. Ooizumi, M. Tsujimura, K. Yokoyama, "Feasible Applications of Bulk HTS magnets and Magnetic Field-Capturing Characteristics in Their Activation Processes," 10th International Workshop on Processing and Applications of Superconducting (RE)BCO Large Grain Materials (PASREG 2017), T34-I, Tokyo, Japan, 2017.12
K. Yokoyama, A. Katsuki, A. Miura, T. Oka, "Comparison of magnetizing characteristics of superconducting bulk magnet cooled by Stirling and GM refrigerators during pulsed field magnetization," 13th European Conference on Applied Superconductivity, 1MP3, Geneva, Swizterland, 2017.9
T. Oka, A. Takeda, S. Sasaki, J. Ogawa, S. Fukui, T. Sato, J. Scheiter, W. Haessler, A. Katsuki, A. Miura, K. Yokoyama, "Magnetic Flux Invasion and Field-Capturing in Pulsed-Field Magnetization for Layered MgB2 Bulk Magnets," 13th European Conference on Applied Superconductivity, 3MO2, Geneva, Swizterland, 2017.9
K. Yokoyama, A. Katsuki, A. Miura, T. Oka, "Enhancement of trapped magnetic field using a large-size REBCO bulk in a desktop type superconducting bulk magnet," 25th International Conference of Magnet Technology (MT25), Mon-Af-Po1.07, Amsterdam, The Netherlands, 2017.8
K. Yokoyama, K. Eranda, Y. Zhao, A. Katsuki, A. Miura, T. Oka, "Influence of Artificial Defects on Trapped Field Performance in a Superconducting Bulk Magnet," 29th International Symposium on Superconductivity (ISS2016), WBP7-2, Tokyo, Japan, 2016.12
T. Oka, K. Hara, A. Takeda, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, A. Nakamura, "Magnetic flux invasion in REBCO bulk magnets with varying pre-magnetized fluxdistributions in multi-PFM process," 29th International Symposium on Superconductivity (ISS2016), WBP7-1, Tokyo, Japan, 2016.12
K. Ichiju, S. Sasaki, J. Ogawa, S. Fukui, T. Sato, T. Oka, K. Yokoyama, S. Aoki, "Magnetic Separation for Recycling Ni Compounds from Processed Plating Waste with Use of HTS Bulk Magnets", 7th International Forum on Magnetic Force Control in Kanazawa (IFMFC7), Kanazawa, Japan, 2016.11
K. Yokoyama, K. Eranda, Y. Zhao, A. Katsuki, A. Miura, T. Oka, "Evaluation of trapped field characteristics in a desktop-type superconducting bulk magnet using a large bulk material," 1st Asian ICMC and CSSJ 50th Anniversary Conference, 2P-p17, Kanazawa, Japan, 2016.11
K. Eranda, Y. Zhao, A. Katsuki, A. Miura, K. Yokoyama, T. Oka, "Relationship between trapped field performance and the number of artificial defects in a holed superconducting bulk magnet," 1st Asian ICMC and CSSJ 50th Anniversary Conference, 2P-p18, Kanazawa, Japan, 2016.11
Y. Zhao, K. Eranda, A. Katsuki, A. Miura, K. Yokoyama, T. Oka, "Evaluation of trapped field performance by multi-pulsed field magnetization on a desktop type superconducting bulk magnet," 1st Asian ICMC and CSSJ 50th Anniversary Conference, 2P-p19, Kanazawa, Japan, 2016.11
A. Katsuki, K. Eranda, Y. Zhao, A. Miura, K. Yokoyama, T. Oka, "Magnetizing performance evaluation of a superconducting bulk magnet activated by an iterative pulsed field magnetization," 1st Asian ICMC and CSSJ 50th Anniversary Conference, 2P-p20, Kanazawa, Japan, 2016.11
T. Oka, K. Ichiju, S. Sasaki, J. Ogawa, S. Fukui, T. Sato, M. Ooizumi, K. Yokoyama, S. Aoki, N. Ohnishi, "Magnetic Separation Using HTS Bulk Magnet for Cs-Bearing Fe precipitates," 1st Asian ICMC and CSSJ 50th Anniversary Conference, 2P-p52, Kanazawa, Japan, 2016.11
A. Miura, S. Yamagata, A. Katsuki, K. Eranda, Y. Zhao, K. Yokoyama, "Fabrication of human levitation system - A.I.T. hoverboard -," 1st Asian ICMC and CSSJ 50th Anniversary Conference, 3P-p15, Kanazawa, Japan, 2016.11
K. Yokoyama, K. Eranda, Y. Zhao, A. Katsuki, A. Miura, T. Oka, "Improvement of trapped magnetic field in a desktop type superconducting bulk magnet," 2016 Applied Superconductivity Conference (ASC16), 2LPo2L-04, Denver Co, USA, 2016.9
T. Oka, K. Ichiju, S. Fukui, J. Ogawa, T. Sato, M. Ooizumi, M. Tsujimura, K. Yokoyama, "Novel Magnetic Separation Technique for Recycling Ni Compounds from Plating Waste with Use of HTS Bulk Magnets," 7th International Workshop on Materials Analysis and Processing in Magnetic Fields (MAP7)," Providence, RI, US, 2016.6
T. Oka, J. Ogawa, S. Fukui, T. Sato, T. Nakano, K. Yokoyama, "Melt-Processed high temperature superconducting bulk magnets and their magnetization behaviors," International Symposium on Fusion Tech 2016," Harbin, China, 2016.1
K. Yokoyama, K. Eranda, Y. Zhao, T. Oka, "Position Dependence of a Small Hole for a Hole Processed Bulk Magnet Activated by Pulsed-Field Magnetization," 28th International Symposium on Superconductivity (ISS2015), SAP-33, Tokyo, Japan, 2015.11
T. Oka, Y. Takahashi, S. Yaginuma, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, T. Nakamura, "Uniform Magnetic Field between Face-To-Face Settled HTS Bulk Magnets Combining Concave and Convex Magnetic Field Distributions," 28th International Symposium on Superconductivity (ISS2015), PCP-45, Tokyo, Japan, 2015.11
K. Yokoyama, K. Eranda, Y. Zhao, T. Oka, "Development of a desktop type superconducting bulkmagnet," International Conference on Magnet Technology (MT24), 1PoBE_13, Seoul, Korea, 2015.10
T. Oka, Y. Takayanagi, S. Machida, K. Ichiju, S. Fukui, J. Ogawa, T. Sato, M. Ooizumi, M. Tsujimura, K. Yokoyama, "Magnetic Separation for Recovering Ni-Compounds fromPlating Waste with Use of HTS Bulk Magnets," International Conference on Magnet Technology (MT24), 2PoCJ_09, Seoul, Korea, 2015.10
K. Yokoyama, K. Eranda, Y. Zhao, T. Oka, "Influence of the position of a small hole on the trapped field performance in a holed superconducting bulk magnet," 12th European Conference on Applied Superconductivity (EUCAS2015), 3A-M-P-03, Lyon, France, 2015.9
T. Oka, K. Hara, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, A. Murakami, M. Langer, "Selective magnetic field invasion into HTS bulk magnets in pulse field magnetizing processes," 12th European Conference on Applied Superconductivity (EUCAS2015), 1A-M-P-01, Lyon, France, 2015.9
K. Yokoyama, R. Igarashi, T. Togasaki, T. Oka, "Pulsed Field Magnetization Characteristics of a Holed Superconducting Bulk Magnet", 27th International Symposium on Superconductivity (ISS2014), SAP-73, Tokyo, Japan, 2014.11
T. Oka, Y. Takahashi, T. Kanai, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, T. Nakamura, "Magnetic Field Uniformity in the Space between Face-to-Face HTS Bulk Magnets for NMR Application", 27th International Symposium on Superconductivity (ISS2014), PC-19, Tokyo, Japan, 2014.11
K. Yokoyama, R. Igarashi, R. Togasaki, T. Oka, "Improvement of the trapped field performance of a holed superconducting bulk magnet", Applied Superconductivity Conference (ASC2014), 3LPo1L-03, Charlotte NC, USA, 2014.8
T. Oka, T. Kibushi, H. Ota, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, A. Murakami, M. Langer, "Preferential Magnetic Flux Invasion and Heat Generation Owing to Macrostructure in HTS Bulk Magnets in Pulse Field Magnetization Processes", Applied Superconductivity Conference (ASC2014), 4MPo2B-06, Charlotte NC, USA, 2014.8
K. Yokoyama, T. Tsukui, H. Mita, N. Tsubonoya, T. Oka, "Investigation of the flux flow inhibiting effect of a hole-opened superconducting bulk magnet", 26th International Symposium on Superconductivity (ISS2013), SAP-104, Tokyo, Japan, 2013.11
T. Oka, Y. Yamada, T. Horiuchi, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, M. Langer, "Pulsed-field invasion to anisotropic-grown HTS bulk magnets with varied seed-crystal positions and numbers", 26th International Symposium on Superconductivity (ISS2013), PCP-49, Tokyo, Japan, 2013.11
K. Yokoyama, T. Tsukui, H. Mita, N. Tsubonoya, T. Oka, "Evaluation of the trapped field performance of a hole-opened superconducting bulk magnet", 23rd International Conference on Magnet Technology (MT23), 3PoAP-04, Boston MA, USA, 2013.7
T. Oka, E. Hirayama, T. Kanai, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, T. Nakamura, "Strong Magnetic Field Generators Containing HTS Bulk magnets and Compact Refrigerators, and Their Field-Trapping Performances", 23rd International Conference on Magnet Technology (MT23), 3PoAP-09, Boston MA, USA, 2013.7
K. Yokoyama, T. Oka, N. Kondo, S. Hosaka, "Experimental verification of the magnetic flux penetration property and a flux flow inhibition effect of a superconducting bulk magnet with small holes", 25th International Symposium on Superconductivity (ISS2012), SAP-75, Tokyo, Japan, 2012.12
T. Oka, D. Ishiduka, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, A. Murakami, H. Stopfel, "Flux-Invading Behaviors and Temperature Changes in Dy123 Bulk Magnet in Iterative Pulse Field Magnetization Process", 25th International Symposium on Superconductivity (ISS2012), PCP-9, Tokyo, Japan, 2012.12
K. Yokoyama, T. Oka, N. Kondo, S. Hosaka, "Evaluation of pulsed-field magnetization of a bulk superconductor with small holes", Applied Superconductivity Conference (ASC2012), 2MPN-01, Portland, USA, 2012.10
T. Oka, D. Mimura, H. Fukazawa, S. Fukui, J. Ogawa, T. Sato, M. Ooizumi, T. Terasazwa, M. Tsujimura, K. Yokoyama, "Recycling Ni-bearing Precipitates from Electroless Plating by Magnetic Separation Using HTS Bulk Magnet", Applied Superconductivity Conference (ASC2012), 2JPA-05, Portland, USA, 2012.10
T. Oka, Y. Yamada, D. Ishiduka, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, "Magnetic Field-Trapping Properties of Melt-Processed RE123 Bulk Superconductors Activated by Pulsed-Field Magnetizing Method", IUMRS-International Conference on Electronic Materials (IUMRS-ICEM 2012), Yokohama, Japan, 2012.9
T. Oka, K. Yokoyama, H. Nabana, Y. Yamada, J. Ogawa, S. Fukui, T. Sato, "Magnetic flux penetration behavior and its composition dependence of melt-processed HTS bulk magnets", 10th International Conference on Materials and Mechanisms of Superconductivity?High Temperature Superconductors M2S-HTSC(X), P3-117, Washington DC, US, 2012.7
T. Oka, H. Fukazawa, S. Fukui, J. Ogawa, T. Sato, M. Ooizumi, K. Yokoyama, M. Tsujimura, "High Magnetic Field Separation Technique by HTS Bulk Magnet for Ni Precipitates from Electroless Plating Waste", 1st China-Japan Symposium on Architectural Planning and Design Research, Harbin Institute of Technology, Harbin, China, 2012.7
N. Kawasaki, S. Uehara, S. Fukui, J. Ogawa, T. Sato, T. Terasawa, Y. Itoh, K. Yokoyama, T. Oka, "Experimental and numerical analysis of flux dynamics in a rare-earth permanent magnet magnetized by intense static fields generated by HTS bulk magnets", International Cryogenic Engineering Conference 24-International Cryogenic Materials Conference (ICEC 24 - ICMC 2012), 17P-P07-08, Fukuoka, 2012.5
T. Oka, D. Ishiduka, T. Otsuka, J. Ogawa, S. Fukui, T. Sato, K. Yokoyama, A. Murakami,"Magnetic and thermal properties of HTS bulk magnet with reduced voids in the pulsed-field magnetizing process", International Conference on Superconductivity and Magnetism (ICSM2012), S-I-288, Istanbul, Turkey, 2012.4
N.Kondo, K.Yokoyama, S.Hosaka, "Magnetic separation of organic dyes using superconducting bulk magnets and magnetic activated carbon", International Conference on Advanced Micro-Device Engineering (AMDE 2011), P37, Gunma, Japan, 2011.12
K.Yokoyama, T.Oka, N.Kondo, S.Hosaka, "Pulsed-field magnetization of a bulk superconductor with small holes", 24th International Symposium on Superconductivity (ISS2011), SAP-95, Tokyo, Japan, 2011.10
N.Kondo, S.Hosaka, K.Yokoyama, "Fundamental study on magnetic separation of organic dyes using superconducting bulk magnets", 24th International Symposium on Superconductivity (ISS2011), SAP-75, Tokyo, Japan, 2011.10
T.Oka, T.Kimura, D.Mimura, H.Fukazawa, S.Fukui, J.Ogawa, T.Sato, M.Ooizumi, K.Yokoyama, M.Tsujimura, T.Terasawa, "Magnetic Separation for Ni Precipitates from Plating Waste Solution Using HTS Bulk Magnet", 24th International Symposium on Superconductivity (ISS2011), SA-5, Tokyo, Japan, 2011.10
K.Yokoyama, T.Oka, K.Noto, "Pulsed-field magnetization of a superconducting bulk magnet after field-cooling using a permanent Magnet", 22nd International Conference on Magnet Technology (MT22), 4FP1-1, Marseille, France, 2011.9
T.Oka, H.Seki, D.Ishiduka, J.Ogawa, S.Fukui, T.Sato, K.Yokoyama, A.Murakami, "Field trapping property of HTS bulk magnet with reduced voids in pulsed", 26th International Conference on Low Temperature Physics (LT26), 16P-B094, Beijing, China, 2011.8