Tetsuo Oka

  • 1864 Citations
  • 22 h-Index
1990 …2019
If you made any changes in Pure these will be visible here soon.

Research Output 1990 2019

Filter
Article
2019
trapped magnetic fields
Refrigerators
refrigerators
Magnetic flux
Magnets
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
1 Citation (Scopus)
Refrigerators
refrigerators
Magnets
Magnetization
magnets
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
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
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
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)

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
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

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
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

Learn-by-doing engineering education programs driven by the engineers of private companies and societies

Oka, T., Harada, S., Tanabe, Y., Narumi, T., Kaneko, F., Sugawara, A., Ishii, N., Nishimura, S., Maruyama, T., Sengoku, M., Ohkawa, H. & Tsubokawa, N., 2013 May 10, In : IEEJ Transactions on Fundamentals and Materials. 133, 4

Research output: Contribution to journalArticle

Engineering education
Engineers
Industry
Students
5 Citations (Scopus)

Magnetic and thermal properties of HTS bulk magnet in the pulsed-field magnetizing process

Oka, T., Ishiduka, D., Ogawa, J., Fukui, S., Sato, T., Yokoyama, K. & Murakami, A., 2013 Apr 1, In : Journal of Superconductivity and Novel Magnetism. 26, 4, p. 1301-1306 6 p.

Research output: Contribution to journalArticle

Magnets
Magnetic properties
magnets
Thermodynamic properties
thermodynamic properties
3 Citations (Scopus)

Magnetic precipitate separation for Ni plating waste liquid using HTS bulk magnets

Oka, T., Kimura, T., Mimura, D., Fukazawa, H., Fukui, S., Ogawa, J., Sato, T., Ooizumi, M., Yokoyama, K., Tsujimura, M. & Terasawa, T., 2013 Jan 15, In : Physica C: Superconductivity and its Applications. 484, p. 325-328 4 p.

Research output: Contribution to journalArticle

liquid wastes
Magnetic separation
Bearings (structural)
plating
Plating
4 Citations (Scopus)

Measurement and numerical analysis of dependence of ac loss in polygonal conductor assembled by YBCO tapes on gap length between neighboring tapes

Fukui, S., Hatakeyama, S., Nanayama, J., Maruko, A., Ogawa, J., Sato, T., Oka, T. & Tsukamoto, O., 2013 Feb 12, In : IEEE Transactions on Applied Superconductivity. 23, 3, 6407801.

Research output: Contribution to journalArticle

Tapes
tapes
numerical analysis
Numerical analysis
conductors
5 Citations (Scopus)

Pulsed-field magnetization of a bulk superconductor with small holes

Yokoyama, K., Oka, T., Kondo, N. & Hosaka, S., 2013 Jan 15, In : Physica C: Superconductivity and its Applications. 484, p. 343-347 5 p.

Research output: Contribution to journalArticle

Magnetic flux
Superconducting materials
magnetic flux
Magnetization
Fluxes
2012
7 Citations (Scopus)

Experimental investigation of loss characteristics with AC and DC offset transport current in HTS double pancake coil

Ogawa, J., Fukui, S., Oka, T., Sato, T., Shibayama, M., Egawa, M. & Sato, A., 2012 Jun 25, In : IEEE Transactions on Applied Superconductivity. 22, 3, 4705004.

Research output: Contribution to journalArticle

alternating current
coils
direct current
Tapes
tapes
2 Citations (Scopus)

Influence of AC transport current balance on AC loss in a two layered polygonal YBCO assembled conductor

Ogawa, J., Fukui, S., Oka, T., Sato, T., Tamura, A., Kasuga, E. & Ryu, K. W., 2012 Jun 25, In : IEEE Transactions on Applied Superconductivity. 22, 3, 4704804.

Research output: Contribution to journalArticle

alternating current
conductors
Superconducting tapes
High temperature applications
tapes
5 Citations (Scopus)

Magnetic field distribution of permanent magnet magnetized by static magnetic field generated by HTS bulk magnet

Oka, T., Kawasaki, N., Fukui, S., Ogawa, J., Sato, T., Terasawa, T., Itoh, Y. & Yabuno, R., 2012 Jun 25, In : IEEE Transactions on Applied Superconductivity. 22, 3, 6101562.

Research output: Contribution to journalArticle

magnetic poles
permanent magnets
Permanent magnets
Magnets
Poles
2 Citations (Scopus)

Magnetizing of permanent magnets using HTS bulk magnets

Oka, T., Muraya, T., Kawasaki, N., Fukui, S., Ogawa, J., Sato, T. & Terasawa, T., 2012 Jan 1, In : Cryogenics. 52, 1, p. 27-31 5 p.

Research output: Contribution to journalArticle

permanent magnets
Permanent magnets
Magnets
magnets
magnetic poles
3 Citations (Scopus)

Measurement and numerical analysis of AC loss in high temperature superconducting coil

Fukui, S., Shibayama, M., Ogawa, J., Oka, T., Sato, T., Takao, T. & Tsukamoto, O., 2012 Jun 25, In : IEEE Transactions on Applied Superconductivity. 22, 3, 4704904.

Research output: Contribution to journalArticle

numerical analysis
Numerical analysis
alternating current
coils
Tapes
12 Citations (Scopus)

Numerical study of optimization design of high temperature superconducting field winding in 20 MW synchronous motor for ship propulsion

Fukui, S., Kawai, T., Takahashi, M., Ogawa, J., Oka, T., Sato, T. & Tsukamoto, O., 2012 Jun 25, In : IEEE Transactions on Applied Superconductivity. 22, 3, 5200504.

Research output: Contribution to journalArticle

Ship propulsion
synchronous motors
design optimization
Synchronous motors
ships

Pulsed-field magnetization of a superconducting bulk magnet after field cooling using a permanent magnet

Yokoyama, K., Oka, T. & Noto, K., 2012 Jun 25, In : IEEE Transactions on Applied Superconductivity. 22, 3, 6094195.

Research output: Contribution to journalArticle

permanent magnets
Permanent magnets
Magnets
Magnetization
magnets
2011
2 Citations (Scopus)

Development and test of model apparatus utilizing HTS magnetic levitation for non-contact spinning clean-up processors of photo mask production

Saito, K., Fukui, S., Ogawa, J., Oka, T., Sato, T., Sorimachi, S. & Miyazaki, S., 2011 Jun 1, In : IEEE Transactions on Applied Superconductivity. 21, 3 PART 2, p. 2241-2244 4 p., 5617305.

Research output: Contribution to journalArticle

Magnetic levitation
levitation
metal spinning
central processing units
Masks
5 Citations (Scopus)

Evaluation of pulsed-field magnetization on a superconducting bulk magnet system using a 13 K refrigerator

Yokoyama, K., Oka, T. & Noto, K., 2011 Jun 1, In : IEEE Transactions on Applied Superconductivity. 21, 3 PART 2, p. 1657-1660 4 p., 5624613.

Research output: Contribution to journalArticle

Refrigerators
refrigerators
Magnets
Magnetization
magnets
4 Citations (Scopus)

Experimental evaluation of the effect on AC loss of a polygonal arrangement in YBCO assembled conductors

Ogawa, J., Fukui, S., Oka, T., Sato, T., Ito, T., Sugisawa, J. & Tamura, A., 2011 Jun 1, In : IEEE Transactions on Applied Superconductivity. 21, 3 PART 3, p. 3285-3288 4 p., 5613958.

Research output: Contribution to journalArticle

alternating current
conductors
evaluation
Tapes
tapes
5 Citations (Scopus)

Improvement of a magnetization method on a small-size superconducting bulk magnet system

Yokoyama, K., Oka, T. & Noto, K., 2011 Nov 1, In : Physica C: Superconductivity and its Applications. 471, 21-22, p. 901-904 4 p.

Research output: Contribution to journalArticle

Magnets
Magnetization
magnets
Magnetic flux
magnetization
6 Citations (Scopus)

Influence of DC offset transport current on AC loss characteristics in HTS tapes

Ogawa, J., Fukui, S., Oka, T., Sato, T., Kojima, H., Shibayama, M. & Egawa, M., 2011 Jun 1, In : IEEE Transactions on Applied Superconductivity. 21, 3 PART 3, p. 3325-3328 4 p., 5621862.

Research output: Contribution to journalArticle

Superconducting tapes
tapes
alternating current
direct current
critical current