Tetsuo Oka

  • 1882 Citations
  • 22 h-Index
1990 …2019
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Research Output 1990 2019

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2005
19 Citations (Scopus)

Generated heat during pulse field magnetizing for REBaCuO (RE = Gd, Sm, Y) bulk superconductors with different pinning abilities

Fujishiro, H., Kaneyama, M., Yokoyama, K., Oka, T. & Noto, K., 2005 Jan 1, In : Superconductor Science and Technology. 18, 1, p. 158-165 8 p.

Research output: Contribution to journalArticle

Magnetic flux
Superconducting materials
heat
Heat generation
Viscous flow
37 Citations (Scopus)

Pulsed field magnetization of a 36 mm diameter single-domain Sm-Ba-Cu-O bulk superconductor at 30, 35 and 77 K

Yanagi, Y., Itoh, Y., Yoshikawa, M., Oka, T., Ikuta, H. & Mizutani, U., 2005 Jun 1, In : Superconductor Science and Technology. 18, 6, p. 839-849 11 p.

Research output: Contribution to journalArticle

Superconducting materials
Magnetization
magnetization
Fluxes
Magnetic fields
37 Citations (Scopus)

Record-high trapped magnetic field by pulse field magnetization using GdBaCuO bulk superconductor

Fuhishiro, H., Kaneyama, M., Tateiwa, T. & Oka, T., 2005 Sep 30, In : Japanese Journal of Applied Physics, Part 2: Letters. 44, 37-41

Research output: Contribution to journalArticle

trapped magnetic fields
Superconducting materials
Magnetization
Magnetic fields
magnetization
15 Citations (Scopus)
elongation
Elongation
Magnetization
magnetization
pulses
2004
1 Citation (Scopus)

Construction of a strong magnetic field generator with wide magnetic poles by bulk superconductors

Oka, T., Yokoyama, K. & Noto, K., 2004 Oct 1, In : Physica C: Superconductivity and its Applications. 412-414, SPEC. ISS., p. 761-765 5 p.

Research output: Contribution to journalArticle

magnetic poles
Superconducting materials
Magnets
Poles
magnets
12 Citations (Scopus)

Construction of strong magnetic field generators by high Tc bulk superconductors and its applications

Oka, T., Yokoyama, K. & Noto, K., 2004 Jun 1, In : IEEE Transactions on Applied Superconductivity. 14, 2, p. 1058-1061 4 p.

Research output: Contribution to journalArticle

magnetic poles
Superconducting materials
Poles
generators
Magnetic fields
20 Citations (Scopus)

Estimation of generated heat in pulse field magnetizing for SmBaCuO bulk superconductor

Fujishiro, H., Yokoyama, K., Kaneyama, M., Oka, T. & Noto, K., 2004 Oct 1, In : Physica C: Superconductivity and its Applications. 412-414, SPEC. ISS., p. 646-650 5 p.

Research output: Contribution to journalArticle

Superconducting materials
heat
pulses
Specific heat
Temperature
13 Citations (Scopus)

Flux motion studies by means of temperature measurement in magnetizing processes for HTSC bulks

Fujishiro, H., Oka, T., Yokoyama, K., Kaneyama, M. & Noto, K., 2004 Jun 1, In : IEEE Transactions on Applied Superconductivity. 14, 2, p. 1054-1057 4 p.

Research output: Contribution to journalArticle

Temperature measurement
high temperature superconductors
temperature measurement
Fluxes
trapped magnetic fields
15 Citations (Scopus)

Generation of extremely strong magnetic fields in open space by using metal-ring-reinforced 60 mm ∅ Sm-Ba-Cu-O superconducting bulk

Yanagi, Y., Yoshikawa, M., Itoh, Y., Oka, T., Ikuta, H. & Mizutani, U., 2004 Oct 1, In : Physica C: Superconductivity and its Applications. 412-414, SPEC. ISS., p. 744-749 6 p.

Research output: Contribution to journalArticle

Superconducting materials
Metals
Stainless Steel
Magnetic fields
reinforcement rings
10 Citations (Scopus)

Temperature measurement of RE123 bulk superconductors on magnetizing process

Yokoyama, K., Kaneyama, M., Oka, T., Fujishiro, H. & Noto, K., 2004 Oct 1, In : Physica C: Superconductivity and its Applications. 412-414, SPEC. ISS., p. 688-694 7 p.

Research output: Contribution to journalArticle

Temperature measurement
Superconducting materials
temperature measurement
Magnetic fields
sectors
26 Citations (Scopus)

Temperature rise in an Sm-based bulk superconductor after applying iterative pulse fields

Fujishiro, H., Yokoyama, K., Oka, T. & Noto, K., 2004 Jan 1, In : Superconductor Science and Technology. 17, 1, p. 51-57 7 p.

Research output: Contribution to journalArticle

Superconducting materials
Heat generation
Magnetic flux
pulses
Spatial distribution
2003
15 Citations (Scopus)

Thermal and mechanical properties of high Tc bulk superconductors and their applications

Noto, K., Oka, T., Yokoyama, K., Katagiri, K., Fujishiro, H., Okada, H., Nakazawa, H., Miryala, M. & Murakami, M., 2003 Oct, In : Physica C: Superconductivity and its Applications. 392-396, PART 1, p. 677-683 7 p.

Research output: Contribution to journalArticle

Superconducting materials
Thermodynamic properties
thermodynamic properties
mechanical properties
Magnetic fields
34 Citations (Scopus)

Time evolution and spatial distribution of temperature in YBCO bulk superconductor after pulse field magnetizing

Fujishiro, H., Oka, T., Yokoyama, K. & Noto, K., 2003 Jul 1, In : Superconductor Science and Technology. 16, 7, p. 809-814 6 p.

Research output: Contribution to journalArticle

Spatial distribution
Superconducting materials
spatial distribution
Magnetic flux
pulses
2002
3 Citations (Scopus)

Oxygen diffusivity in melt-processed SmBCO and YBCO bulk-superconductors

Yamada, T., Ikuta, H., Yoshikawa, M., Yanagi, Y., Itoh, Y., Oka, T. & Mizutani, U., 2002 Oct 1, In : Physica C: Superconductivity and its Applications. 378-381, PART 1, p. 713-717 5 p.

Research output: Contribution to journalArticle

Superconducting materials
diffusivity
Oxygen
oxygen
diffusion coefficient
33 Citations (Scopus)

Present status of R & D on superconducting magnetic bearing technologies for flywheel energy storage system

Koshizuka, N., Ishikawa, F., Nasu, H., Murakami, M., Matsunaga, K., Saito, S., Saito, O., Nakamura, Y., Yamamoto, H., Takahata, R., Oka, T., Ikezawa, H. & Tomita, M., 2002 Oct 1, In : Physica C: Superconductivity and its Applications. 378-381, PART 1, p. 11-17 7 p.

Research output: Contribution to journalArticle

flywheels
magnetic bearings
Magnetic bearings
Flywheels
energy storage
2001
13 Citations (Scopus)

Improvement of the microstructure of melt-processed Sm-based superconductors

Tazoe, K., Ikuta, H., Yoshikawa, M., Yanagi, Y., Itoh, Y., Oka, T. & Mizutani, U., 2001 Jan 1, In : Physica C: Superconductivity and its Applications. 357-360, p. 807-810 4 p.

Research output: Contribution to journalArticle

Superconducting materials
Gases
atmospheres
microstructure
Microstructure
15 Citations (Scopus)

Melt processing and the performance as a superconducting permanent magnet of RE-Ba-Cu-O/Ag (RE = Sm, Nd)

Ikuta, H., Yanagi, Y., Yoshikawa, M., Itoh, Y., Oka, T. & Mizutani, U., 2001 Jan 1, In : Physica C: Superconductivity and its Applications. 357-360, p. 837-842 6 p.

Research output: Contribution to journalArticle

Superconducting magnets
superconducting magnets
permanent magnets
Permanent magnets
Superconducting materials
16 Citations (Scopus)

Pulsed field magnetization of melt-processed Sm-Ba-Cu-O

Ishihara, H., Ikuta, H., Itoh, Y., Yanagi, Y., Yoshikawa, M., Oka, T. & Mizutani, U., 2001 Jan 1, In : Physica C: Superconductivity and its Applications. 357-360, p. 763-766 4 p.

Research output: Contribution to journalArticle

Magnetic flux
flat surfaces
Magnetization
Fluxes
magnetization
2 Citations (Scopus)

Synthesis and magnetization of high-Tc bulk superconductors and their application as superconducting permanent magnets

Mizutani, U., Ikuta, H., Oka, T., Itoh, Y., Yanagi, Y. & Yoshikawa, M., 2001 Dec 1, In : International Journal of Applied Electromagnetics and Mechanics. 14, 1-4 SPEC., p. 57-63 7 p.

Research output: Contribution to journalArticle

Superconducting magnets
superconducting magnets
permanent magnets
Permanent magnets
Superconducting materials
1999

Recent development in superconducting permanent magnets

Mizutani, U., Oka, T., Itoh, Y. & Ikuta, H., 1999 Jan 1, In : Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy. 46, 12, p. 1241-1248 8 p.

Research output: Contribution to journalArticle

Superconducting magnets
Permanent magnets
Superconducting materials
Magnetization
Fluxes
18 Citations (Scopus)

Synthesis of c-axis oriented single-domain Sm123 superconductors capable of trapping 9 Tesla at 25 K and its application to a strong magnetic field generator

Mizutani, U., Mase, A., Ikuta, H., Yanagi, Y., Yoshikawa, M., Itoh, Y. & Oka, T., 1999 Oct 29, In : Materials Science and Engineering B: Solid-State Materials for Advanced Technology. 65, 1, p. 66-68 3 p.

Research output: Contribution to journalArticle

Superconducting materials
generators
flux density
trapping
Magnetic fields
1998
144 Citations (Scopus)

Melt-processed Sm-Ba-Cu-O superconductors trapping strong magnetic field

Ikuta, H., Mase, A., Yanagi, Y., Yoshikawa, M., Itoh, Y., Oka, T. & Mizutani, U., 1998 Nov 1, In : Superconductor Science and Technology. 11, 11, p. 1345-1347 3 p.

Research output: Contribution to journalArticle

Superconducting materials
trapping
Magnetic fields
Oxygen
magnetic fields
34 Citations (Scopus)

Melt-processing of Ag-added LRE-Ba-Cu-O (LRE = Nd, Sm)

Ikuta, H., Ikeda, S., Mase, A., Yoshikawa, M., Yanagi, Y., Itoh, Y., Oka, T. & Mizutani, U., 1998 Jan 1, In : Applied Superconductivity. 6, 2-5, p. 109-117 9 p.

Research output: Contribution to journalArticle

Magnetic fields
Oxygen
Processing
trapped magnetic fields
atmospheres
100 Citations (Scopus)

Pulsed-field magnetization applied to high-Tc superconductors

Mizutani, U., Oka, T., Itoh, Y., Yanagi, Y., Yoshikawa, M. & Ikuta, H., 1998 Jan 1, In : Applied Superconductivity. 6, 2-5, p. 235-246 12 p.

Research output: Contribution to journalArticle

Superconducting materials
Magnetization
magnetization
YBCO superconductors
Fluxes
1997
14 Citations (Scopus)

Effect of Nd422 addition on Jc in Nd123 melt-textured bulk superconductor

Ikeda, S., Oka, T., Yamada, Y., Yoshikawa, M., Yanagi, Y., Itoh, Y. & Mizutani, U., 1997 Jan 1, In : Japanese Journal of Applied Physics, Part 2: Letters. 36, 3 B

Research output: Contribution to journalArticle

Superconducting materials
Powders
Magnetic fields
atmospheres
heat
3 Citations (Scopus)

High temperature superconducting quasi-permanent magnets and their application to superconducting motor

Oka, T., Itoh, Y., Yanagi, Y., Yoshikawa, M., Sakakibara, T., Harada, S., Yamada, Y. & Mizutani, U., 1997 Jan 1, In : Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals. 61, 9, p. 931-936 6 p.

Research output: Contribution to journalArticle

high field magnets
Superconducting magnets
permanent magnets
Permanent magnets
Magnetization
15 Citations (Scopus)

Numerical evaluation of pulsed field magnetization of a bulk high Tc superconductor

Tsuchimoto, M., Waki, H., Itoh, Y., Yanagi, Y., Yoshikawa, M., Oka, T., Yamada, Y. & Mizutani, U., 1997 Jan 1, In : Cryogenics. 37, 1, p. 43-47 5 p.

Research output: Contribution to journalArticle

heat generation
Heat generation
Superconducting materials
Magnetization
Shielding
1996
7 Citations (Scopus)

Pulsed field magnetization of melt-processed Y-Ba-Cu-O bulk superconductor with no weak links

Itoh, Y., Yanagi, Y., Yoshikawa, M., Oka, T., Yamada, Y. & Mizutani, U., 1996 Dec 1, In : Japanese Journal of Applied Physics, Part 2: Letters. 35, 9 B

Research output: Contribution to journalArticle

Magnetic flux
Superconducting materials
Magnetization
magnetization
Heat generation
1995
65 Citations (Scopus)

High-temperature superconducting motor using y-ba-cu-0 bulk magnets

Itoh, Y., Yanagi, Y., Yoshikawa, M., Oka, T., Harada, S., Sakakibara, T., Yamada, Y. & Mizutani, U., 1995 Jan 1, In : Japanese Journal of Applied Physics. 34, 10, p. 5574-5578 5 p.

Research output: Contribution to journalArticle

Magnets
magnets
YBCO superconductors
armatures
magnetic fields
30 Citations (Scopus)

Preparation of melt-textured NdBa2Cu3Oy bulk with Nd4Ba2Cu2O10 addition

Takagi, A., Yamazaki, T., Oka, T., Yanagi, Y., Itoh, Y., Yoshikawa, M., Yamada, Y. & Mizutani, U., 1995 Aug 15, In : Physica C: Superconductivity and its Applications. 250, 3-4, p. 222-226 5 p.

Research output: Contribution to journalArticle

Superconducting materials
Single crystals
preparation
Superconducting transition temperature
atmospheres
1994
10 Citations (Scopus)

A construction of high temperature superconducting motor using YBCO bulk magnets

Itoh, Y., Yanagi, Y., Yoshikawa, M., Oka, T., Harada, S., Sakakibara, T., Yamada, Y. & Mizutani, U., 1994 Jan 1, In : Physica C: Superconductivity and its applications. 235-240, PART 5, p. 3445-3446 2 p.

Research output: Contribution to journalArticle

Liquid nitrogen
liquid nitrogen
Magnets
magnets
YBCO superconductors

The microstructure and superconducting properties of melt-processed YBCO samples containing RE-211 particles

Yanagi, Y., Itoh, Y., Yoshikawa, M., Oka, T., Sasaki, M., Yamada, Y. & Mizutani, U., 1994 Jan 1, In : Physica C: Superconductivity and its Applications. 235-240, PART 1, p. 445-446 2 p.

Research output: Contribution to journalArticle

solidification
Solidification
Doping (additives)
microstructure
Microstructure
1992
67 Citations (Scopus)

Critical current density and mechanical strength of YBa2Cu3O7-δ superconducting composites containing Zr, Ag and Y2BaCuO5 dispersions by melt-processing

Oka, T., Itoh, Y., Yanagi, Y., Tanaka, H., Takashima, S., Yamada, Y. & Mizutani, U., 1992 Sep 15, In : Physica C: Superconductivity and its Applications. 200, 1-2, p. 55-64 10 p.

Research output: Contribution to journalArticle

Dispersions
Strength of materials
critical current
inclusions
current density
5 Citations (Scopus)

Metallurgical Reactions and Their Relationships to Enhanced Mechanical Strength in Zr-Bearing YBCO Composite Superconductors

Oka, T., Itoh, Y., Yanagi, Y., Tanaka, H., Takashima, S. I. & Mizutani, U., 1992 Jan 1, In : Japanese Journal of Applied Physics. 31, 6 R, p. 1760-1764 5 p.

Research output: Contribution to journalArticle

Bearings (structural)
Superconducting materials
Strength of materials
Melting
composite materials
1991
2 Citations (Scopus)

Mechanical properties of Zr-YBCO/Ag sintered superconducting composites

Oka, T., Itoh, Y., Yanagi, Y., Tanaka, H. & Mizutani, U., 1991 Dec 1, In : Physica C: Superconductivity and its Applications. 185-189, PART 1, p. 507-508 2 p.

Research output: Contribution to journalArticle

Strength of materials
mechanical properties
Mechanical properties
composite materials
Composite materials
1990
21 Citations (Scopus)

Mechanical and superconducting properties of Ag/YBCO composite superconductors reinforced by the addition of Zr

Oka, T., Ogasawara, F., Itoh, Y., Suganuma, M. & Mizutani, U., 1990 Jan 1, In : Japanese Journal of Applied Physics. 29, 10, p. 1924-1931 8 p.

Research output: Contribution to journalArticle

flexural strength
Bending strength
Superconducting materials
Bearings (structural)
mechanical properties