Tetsuo Oka

  • 1864 Citations
  • 22 h-Index
1990 …2019
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Research Output 1990 2019

2019
trapped magnetic fields
Refrigerators
refrigerators
Magnetic flux
Magnets

Infiltration growth processing of bulk mixed REBa 2 Cu 3 O 7-x superconductors: Nano-metal oxides and rare earth elements effects on micro-structural properties

Pavan Kumar Naik, S., Nagaveni, K., Swarup Raju, P. M., Miryala, M., Koblischka, M. R., Koblischka-Veneva, A. D., Oka, T., Iwasa, Y., Ogino, H., Eisaki, H. & Murakami, M., 2019 Jan 1, Superconductivity and Particle Accelerators 2018. Bocian, D. & Romaniuk, R. S. (eds.). SPIE, 110540H. (Proceedings of SPIE - The International Society for Optical Engineering; vol. 11054).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

infiltration
Rare earth elements
Infiltration
Oxides
Superconducting materials

International individual internship based on research collaboration on engineering education and academic science

Oka, T., Murakami, M., Sengoku, M., Sato, T., Ogawa, J., Yamagiwa, K., Suzuki, T., Nishimura, S. Y. & Kaneko, F., 2019 Jan 29, 2018 World Engineering Education Forum - Global Engineering Deans Council, WEEF-GEDC 2018. Institute of Electrical and Electronics Engineers Inc., 8629681. (2018 World Engineering Education Forum - Global Engineering Deans Council, WEEF-GEDC 2018).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

internship
Engineering education
Students
engineering
science
Processing
1 Citation (Scopus)
Open Access
Grain refinement
Rare earth elements
Infiltration
Superconducting materials
Tuning

Study on Magnetic Flux Dissipation and Field-Trapping Performance of HTS Bulk-Shaped Magnesium Diboride in Pulse-Field Magnetizing Processes

Oka, T., Takeda, A., Oki, H., Ogawa, J., Fukui, S., Scheiter, J., Häßler, W., Yokoyama, K., Yamanaka, K., Dadiel, L., Miryala, M., Sakai, N., Murakami, M. & Noudem, J., 2019 Aug 1, In : IEEE Transactions on Applied Superconductivity. 29, 5, 8678817.

Research output: Contribution to journalArticle

Magnetic flux
Magnesium
magnetic flux
magnesium
dissipation
2018
1 Citation (Scopus)

AC loss distribution in two-layer HTS cable

Ogawa, J., Fukui, S., Oka, T., Ogawa, T. & Sugai, M., 2018 Apr 1, In : IEEE Transactions on Applied Superconductivity. 28, 3, 5900104.

Research output: Contribution to journalArticle

Superconducting cables
cables
alternating current
Magnetic fields
Temperature

A review article: Compact magnetic field generators containing HTS bulk magnets cooled by refrigerators and their feasible applications

Oka, T., Ogawa, J., Fukui, S., Sato, T., Nakano, T., Yokoyama, K., Nakamura, T., Fujishiro, H. & Noto, K., 2018 Jan 1, High-Temperature Superconductors: Occurrence, Synthesis and Applications. Nova Science Publishers, Inc., p. 291-306 16 p.

Research output: Chapter in Book/Report/Conference proceedingChapter

Refrigerators
Magnets
Magnetic fields
Poles
Electromagnets

Collecting Ni-Sulfate Compound from Electroless Plating Waste by Magnetic Separation Technique with Use of HTS Bulk Magnets

Oka, T., Sasaki, S., Sasaki, H., Fukui, S., Ogawa, J., Sato, T., Nakano, T., Ooizumi, M., Tsujimura, M. & Yokoyama, K., 2018 Jul 26, In : Journal of Physics: Conference Series. 1054, 1, 012047.

Research output: Contribution to journalConference article

plating
sulfates
magnets
fluids
crystals
1 Citation (Scopus)
Refrigerators
refrigerators
Magnets
Magnetization
magnets

Comparison of Trapped Field Characteristic of Bulk Magnet System Using Various Type Refrigerators

Yokoyama, K., Katsuki, A., Miura, A. & Oka, T., 2018 Jul 26, In : Journal of Physics: Conference Series. 1054, 1, 012072.

Research output: Contribution to journalConference article

refrigerators
magnets
cooling
trapped magnetic fields
magnetic fields

Development of Engineering Education Program for Students before Starting Graduation Researches on Forefront Technologies

Oka, T., Suzuki, T., Abe, K., Yamauchi, T., Yamagiwa, K., Sato, T., Tanabe, Y. & Narumi, T., 2018 Sep 17, Proceedings - 2017 7th World Engineering Education Forum, WEEF 2017- In Conjunction with: 7th Regional Conference on Engineering Education and Research in Higher Education 2017, RCEE and RHEd 2017, 1st International STEAM Education Conference, STEAMEC 2017 and 4th Innovative Practices in Higher Education Expo 2017, I-PHEX 2017. Institute of Electrical and Electronics Engineers Inc., p. 136-139 4 p. 8467132

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Engineering education
Students
engineering
education
student
1 Citation (Scopus)

Enhancement of Trapped Magnetic Field Using a Large-Size REBCO Bulk in a Desktop Type Superconducting Bulk Magnet

Yokoyama, K., Katsuki, A., Miura, A. & Oka, T., 2018 Apr 1, In : IEEE Transactions on Applied Superconductivity. 28, 3, 8187669.

Research output: Contribution to journalArticle

trapped magnetic fields
Magnets
magnetic flux
magnets
Magnetic fields

Feasible Applications of Bulk HTS Magnets and Magnetic Field-Capturing Characteristics in Their Activation Processes

Oka, T., Takeda, A., Shimizu, K., Higa, K., Tsunoda, S., Ogawa, J., Fukui, S., Sato, T., Yokoyama, K. & Nakamura, T., 2018 Aug 28, (Accepted/In press) In : IEEE Transactions on Applied Superconductivity.

Research output: Contribution to journalArticle

Magnets
magnets
Chemical activation
activation
Magnetic fields

Magnetic Flux Invasion and Field-Capturing in Pulsed-Field Magnetization for Layered MgB<formula><tex>$_2$</tex></formula> Bulk Magnets

Oka, T., Takeda, A., Sasaki, S., Ogawa, J., Fukui, S., Sato, T., Haessler, W. & Yokoyama, K., 2018 Jan 11, (Accepted/In press) In : IEEE Transactions on Applied Superconductivity.

Research output: Contribution to journalArticle

Magnetic flux
Magnets
magnetic flux
Magnetization
magnets
1 Citation (Scopus)

Magnetic Flux Invasion and Field-Capturing in Pulsed-Field Magnetization for Layered MgB2 Bulk Magnets

Oka, T., Takeda, A., Sasaki, S., Ogawa, J., Fukui, S., Sato, T., Scheiter, J., Häßler, W., Katsuki, J., Miura, A. & Yokoyama, K., 2018 Jun 1, In : IEEE Transactions on Applied Superconductivity. 28, 4, 8255574.

Research output: Contribution to journalArticle

Magnetic flux
Magnets
magnetic flux
Magnetization
magnets

Magnetizing performance evaluation of HTS bulk magnet using a 12 K refrigerator with high cooling capacity

Yokoyama, K., Katsuki, A., Miura, A. & Oka, T., 2018 Aug 13, (Accepted/In press) In : IEEE Transactions on Applied Superconductivity.

Research output: Contribution to journalArticle

Refrigerators
refrigerators
Magnets
magnets
Cooling
1 Citation (Scopus)

Modeling of Magnetization Loss in HTS Tape Exposed to All Magnetic Field Directions

Ogawa, J., Fukui, S., Oka, T., Panpan, Y. & Kanamori, K., 2018 Apr 1, In : IEEE Transactions on Applied Superconductivity. 28, 3, 8239653.

Research output: Contribution to journalArticle

Tapes
tapes
Magnetization
Magnetic fields
magnetization

Strong magnetic field generation by superconducting bulk magnets using various types of refrigerators and considering an efficient magnetization

Yokoyama, K. & Oka, T., 2018 Jan 1, High-Temperature Superconductors: Occurrence, Synthesis and Applications. Nova Science Publishers, Inc., p. 369-385 17 p.

Research output: Chapter in Book/Report/Conference proceedingChapter

Refrigerators
Magnets
Magnetization
Magnetic fields
Magnetic flux
2017
4 Citations (Scopus)

Experimental and theoretical study of AC losses in variable asymmetrical magnetic environments

Ranecky, S. T., Watanabe, H., Ogawa, J., Oka, T., Gölden, D., Alff, L. & Genenko, Y. A., 2017 Jul 6, In : Superconductor Science and Technology. 30, 8, 085005.

Research output: Contribution to journalArticle

Tapes
tapes
alternating current
Shielding
shielding
2 Citations (Scopus)

Experimental investigation of AC loss characteristics in HTS tape with rotating magnetic field

Ogawa, J., Fukui, S., Oka, T., Sano, Y., Ogawa, M. & Ranecky, S. T., 2017 Jun 1, In : IEEE Transactions on Applied Superconductivity. 27, 4, 7812682.

Research output: Contribution to journalArticle

Superconducting tapes
tapes
alternating current
Magnetic fields
magnetic fields
1 Citation (Scopus)

Influence of Artificial Defects on Trapped Field Performance in a Superconducting Bulk Magnet

Yokoyama, K., Eranda, K., Zhao, Y., Katsuki, A., Miura, A. & Oka, T., 2017 Jul 26, In : Journal of Physics: Conference Series. 871, 1, 012050.

Research output: Contribution to journalConference article

magnets
sectors
defects
magnetic flux
trapped magnetic fields

Magnetic flux invasion in REBCO bulk magnets with varying pre-magnetized flux distributions in multiple-PFM processes

Oka, T., Hara, K., Takeda, A., Ogawa, J., Fukui, S., Sato, T., Yokoyama, K. & Murakami, A., 2017 Jul 26, In : Journal of Physics: Conference Series. 871, 1, 012049.

Research output: Contribution to journalConference article

pulse frequency modulation
magnetic flux
magnets
heat generation
promotion
1 Citation (Scopus)

Magnetic Separation Using HTS Bulk Magnet for Cs-Bearing Fe precipitates

Oka, T., Ichiju, K., Sasaki, S., Ogawa, J., Fukui, S., Sato, T., Ooizumi, M., Yokoyama, K., Aoki, S. & Ohnishi, N., 2017 Sep 21, In : Journal of Physics: Conference Series. 897, 1, 012024.

Research output: Contribution to journalConference article

precipitates
magnets
incinerators
ashes
magnetic fields
2 Citations (Scopus)

Pulse-Field Magnetization for Disc-Shaped MgB2 Bulk Magnets

Miyazaki, T., Fukui, S., Ogawa, J., Sato, T., Oka, T., Scheiter, J., Hasler, W., Kulawansha, E., Yuanding, Z. & Yokoyama, K., 2017 Jun 1, In : IEEE Transactions on Applied Superconductivity. 27, 4, 7782353.

Research output: Contribution to journalArticle

Magnets
Magnetization
magnets
magnetization
heat generation
2016
7 Citations (Scopus)

Development of a Desktop-Type Superconducting Bulk Magnet

Yokoyama, K., Kulawansha, E., Yuanding, Z. & Oka, T., 2016 Jun 1, In : IEEE Transactions on Applied Superconductivity. 26, 4, 7386635.

Research output: Contribution to journalArticle

Refrigerators
refrigerators
Magnets
Magnetization
magnets
7 Citations (Scopus)

Experimental Investigation of AC Loss Characteristics of Stacked HTS Tapes in an Iron Core

Ogawa, J., Fukui, S., Oka, T., Sakurai, T., Sano, Y., Tada, H. & Yoshii, Y., 2016 Jun 1, In : IEEE Transactions on Applied Superconductivity. 26, 4, 7435291.

Research output: Contribution to journalArticle

Tapes
tapes
alternating current
Iron
iron
3 Citations (Scopus)

Influence of the Position of a Small Hole on the Trapped Field Performance in a Holed Superconducting Bulk Magnet

Yokoyama, K., Kulawansha, M. P. E. S., Yuanding, Z. & Oka, T., 2016 Apr 1, In : IEEE Transactions on Applied Superconductivity. 26, 3, 7416160.

Research output: Contribution to journalArticle

Magnets
magnets
sectors
Magnetic flux
magnetic flux

Magnetic Field Direction Dependence of AC Losses in Bi2223/Ag Tape

Ogawa, J., Fukui, S., Oka, T., Shidara, N., Iwashita, R. & Ohya, M., 2016 Jun 1, In : IEEE Transactions on Applied Superconductivity. 26, 4, 7377072.

Research output: Contribution to journalArticle

Tapes
tapes
alternating current
Magnetic fields
magnetic fields
8 Citations (Scopus)

Magnetic Separation for Recovering Ni Compounds from Plating Waste with Use of HTS Bulk Magnets

Oka, T., Takayanagi, Y., Machida, S., Ichiju, K., Fukui, S., Ogawa, J., Sato, T., Ooizumi, M., Tsujimura, M. & Yokoyama, K., 2016 Jun 1, In : IEEE Transactions on Applied Superconductivity. 26, 4, 7383257.

Research output: Contribution to journalArticle

Magnetic separation
plating
Plating
Magnets
Precipitates
3 Citations (Scopus)

Selective Magnetic Field Invasion into HTS Bulk Magnets in Pulse Field Magnetizing Processes

Oka, T., Hara, K., Ogawa, J., Fukui, S., Sato, T., Yokoyama, K., Murakami, A. & Langer, M., 2016 Apr 1, In : IEEE Transactions on Applied Superconductivity. 26, 3, 7405303.

Research output: Contribution to journalArticle

Magnets
Magnetic flux
magnets
sectors
magnetic flux
1 Citation (Scopus)

Uniform Magnetic Field between Face-to-Face HTS Bulk Magnets Combining Concave and Convex Magnetic Field Distributions

Oka, T., Takahashi, Y., Yaginuma, S., Ogawa, J., Fukui, S., Sato, T., Yokoyama, K. & Nakamura, T., 2016 Jan 1, In : Physics Procedia. 81, p. 45-48 4 p.

Research output: Contribution to journalConference article

magnets
magnetic fields
poles
magnetic poles
nonuniform magnetic fields
2015

A Numerical Proposal of an After Heating Method for Pulse Field Magnetization for HTS Bulk Magnets

Ogawa, J., Oka, T., Fukui, S., Sato, T. & Watanabe, N., 2015 Jun 1, In : IEEE Transactions on Applied Superconductivity. 25, 3, 6945334.

Research output: Contribution to journalArticle

Magnets
proposals
Magnetization
magnets
Magnetic fields
2 Citations (Scopus)

Attempt to generate a strong and uniform magnetic field by face-to-face HTS bulk elements in a magnet system

Oka, T., Hirayama, E., Takahashi, Y., Kanai, T., Ogawa, J., Fukui, S., Sato, T., Yokoyama, K. & Nakamura, T., 2015 Jan 1, In : Physics Procedia. 67, p. 1005-1009 5 p.

Research output: Contribution to journalConference article

magnets
magnetic poles
magnetic fields
iron
nuclear magnetic resonance

Educational programs for freshmen based on forefront scientific researches on the environmental purification project with intense magnetic fields

Oka, T., Yamauchi, T., Abe, K., Narumi, T. & Tanabe, Y., 2015 Jan 1, Proceedings of 2014 International Conference on Interactive Collaborative Learning, ICL 2014. Institute of Electrical and Electronics Engineers Inc., p. 1068-1072 5 p. 7017931

Research output: Chapter in Book/Report/Conference proceedingConference contribution

educational program
Purification
Students
Magnetic fields
university
2 Citations (Scopus)

Improvement of the trapped field performance of a holed superconducting bulk magnet

Yokoyama, K., Igarashi, R., Togasaki, R. & Oka, T., 2015 Jun 1, In : IEEE Transactions on Applied Superconductivity. 25, 3, 7006763.

Research output: Contribution to journalArticle

Magnets
Magnetization
magnets
Magnetic flux
Magnetic fields
5 Citations (Scopus)

Magnetization behavior of RE123 bulk magnets bearing twin seed-crystals in pulsed field magnetization processes

Oka, T., Miyazaki, T., Ogawa, J., Fukui, S., Sato, T., Yokoyama, K. & Langer, M., 2015 Dec 17, In : Superconductor Science and Technology. 29, 2, 024003.

Research output: Contribution to journalArticle

Bearings (structural)
Magnetic flux
Magnets
magnetic flux
Seed
2 Citations (Scopus)

Preferential magnetic flux invasion and heat generation owing to macrostructure in HTS bulk magnets in pulse field magnetization processes

Oka, T., Ota, H., Shimoda, T., Ogawa, J., Fukui, S., Sato, T., Yokoyama, K., Murakami, A. & Langer, M., 2015 Jun 1, In : IEEE Transactions on Applied Superconductivity. 25, 3, 6980106.

Research output: Contribution to journalArticle

heat generation
Heat generation
Magnetic flux
Magnets
magnetic flux
2 Citations (Scopus)

Pulsed field magnetization characteristics of a holed superconducting bulk magnet

Yokoyama, K., Igarashi, R., Togasaki, R. & Oka, T., 2015 Jun 25, In : Physica C: Superconductivity and its Applications. 518, p. 117-121 5 p.

Research output: Contribution to journalArticle

Magnets
Magnetization
magnets
magnetization
Magnetic fields

Roles and effects of human network of supporting experts out of Niigata University to practical engineering education

Oka, T., Abe, K., Yamauchi, T., Narumi, T., Ishii, N., Nishimura, S., Sato, T., Tanabe, Y. & Sengoku, M., 2015 Nov 4, Proceedings of 2015 International Conference on Interactive Collaborative Learning, ICL 2015. Institute of Electrical and Electronics Engineers Inc., p. 150-154 5 p. 7318017

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Engineering education
expert
engineering
education
Students
2014
11 Citations (Scopus)

Collection of Ni-bearing material from electroless plating waste by magnetic separation with HTS bulk magnet

Oka, T., Fukazawa, H., Fukui, S., Ogawa, J., Sato, T., Ooizumi, M., Tsujimura, M. & Yokoyama, K., 2014 Jan 15, In : Physica C: Superconductivity and its Applications. 496, C, p. 58-62 5 p.

Research output: Contribution to journalArticle

Bearings (structural)
Magnetic separation
Electroless plating
plating
Sulfates
3 Citations (Scopus)

Influence of the arrangement of HTS tapes inserted in an iron core on AC loss characteristics

Ogawa, J., Fukui, S., Oka, T., Sato, T., Fushimi, A. & Shoda, T., 2014 Jan 1, In : IEEE Transactions on Applied Superconductivity. 24, 3, 6595123.

Research output: Contribution to journalArticle

High temperature superconductors
high temperature superconductors
Tapes
tapes
alternating current
4 Citations (Scopus)

Magnetic flux-trapping of anisotropic-grown Y-Ba-Cu-O bulk superconductors during and after pulsed-field magnetizing processes

Oka, T., Yamada, Y., Horiuchi, T., Ogawa, J., Fukui, S., Sato, T., Yokoyama, K. & Langer, M., 2014 Jan 1, In : Journal of Physics: Conference Series. 507, PART 1, 012039.

Research output: Contribution to journalConference article

magnetic flux
seeds
trapping
magnets
penetration

Magnetic separation technique using high temperature superconducting bulk magnets and application to plating liquid waste treatment

Oka, T., Fukazawa, H., Yoshizawa, N., Takayanagi, Y., Ogawa, J., Fukui, S., Sato, T., Ooizumi, M., Tsujimura, M. & Yokoyama, K., 2014 Jan 1, In : Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy. 61, SUPLL.1

Research output: Contribution to journalArticle

Magnetic separation
Waste treatment
Nickel
Plating
Magnets
3 Citations (Scopus)

Numerical study of the influence of material properties on pulsed-field magnetization for hts bulk magnets

Ogawa, J., Oka, T., Fukui, S., Sato, T., Watanabe, N. & Basir, Z. M., 2014 Jan 1, In : IEEE Transactions on Applied Superconductivity. 24, 3, 6600815.

Research output: Contribution to journalArticle

Magnets
Magnetization
Materials properties
magnets
magnetization
18 Citations (Scopus)

Strong magnetic field generator containing HTS bulk magnets and compact refrigerators

Oka, T., Hirayama, E., Kanai, T., Ogawa, J., Fukui, S., Sato, T., Yokoyama, K. & Nakamura, T., 2014 Jan 1, In : IEEE Transactions on Applied Superconductivity. 24, 3, 6626624.

Research output: Contribution to journalArticle

Refrigerators
refrigerators
Magnetic flux
Magnets
magnets
2013
2 Citations (Scopus)

Development and test of model apparatus of non-contact spin processor for photo mask production applying radial-type superconducting magnetic bearing

Saito, K., Fukui, S., Maezawa, M., Ogawa, J., Oka, T. & Sato, T., 2013 Jan 15, In : Physica C: Superconductivity and its Applications. 484, p. 321-324 4 p.

Research output: Contribution to journalArticle

magnetic bearings
Magnetic bearings
spinners
central processing units
Masks
3 Citations (Scopus)

Evaluation of pulsed-field magnetization of a bulk superconductor with small holes

Yokoyama, K., Oka, T., Kondo, N. & Hosaka, S., 2013 Feb 11, In : IEEE Transactions on Applied Superconductivity. 23, 3, 6403884.

Research output: Contribution to journalArticle

Superconducting materials
Magnetization
magnetization
evaluation
Magnetic flux
3 Citations (Scopus)

Experimental verification of the magnetic flux penetration property and flux flow inhibition effect of a superconducting bulk magnet with small holes

Yokoyama, K., Oka, T., Kondo, N. & Hosaka, S., 2013 Jan 1, In : Physics Procedia. 45, p. 261-264 4 p.

Research output: Contribution to journalConference article

magnetic flux
magnets
penetration
current density
retarding
5 Citations (Scopus)

Flux-invading behaviors and temperature changes in Dy123 bulk magnet in iterative pulse field magnetization process

Oka, T., Ishiduka, D., Ogawa, J., Fukui, S., Sato, T., Yokoyama, K., Murakami, A. & Stopfel, H., 2013 May 6, In : Physica C: Superconductivity and its Applications. 494, p. 46-49 4 p.

Research output: Contribution to journalArticle

Magnetic flux
Magnets
Magnetization
magnets
Fluxes