Research Output 1983 2020

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2003
36 Citations (Scopus)

Theoretical investigation on the detection ratio of the magnetization in superconducting wires by a saddle-shaped pick-up coil

Iwakuma, M., Nanri, M., Fukui, M., Fukuda, Y., Kajikawa, K. & Funaki, K., May 1 2003, In : Superconductor Science and Technology. 16, 5, p. 545-556 12 p.

Research output: Contribution to journalArticle

Superconducting wire
saddles
Magnetization
coils
wire
9 Citations (Scopus)

Wire Particle Motion Behavior and Breakdown Characteristics around Different Shaped Spacers within Diverging Air Gap

Khan, Y., Oda, A., Suehiro, J., Hara, M. & Okabe, S., Jan 1 2003, In : IEEJ Transactions on Power and Energy. 123, 11, p. 1288-1295 8 p.

Research output: Contribution to journalArticle

Wire
Air
Electric potential
Flashover
Adhesion
2002

Ac losses in superconducting parallel conductors in saturation case

Tanaka, H., Iwakuma, M. & Funaki, K., Mar 1 2002, In : Research Reports on Information Science and Electrical Engineering of Kyushu University. 7, 1, p. 13-18 6 p.

Research output: Contribution to journalArticle

Shielding
Critical currents
Induced currents
Magnetic flux
Experiments
Current voltage characteristics
alternating current
slabs
electric potential
Magnetic fields
12 Citations (Scopus)

Balanced buck-boost switching converter to reduce common-mode conducted noise

Shoyama, M., Ohba, M. & Ninomiya, T., 2002, In : Unknown Journal. 4, p. 2056-2062 7 p.

Research output: Contribution to journalArticle

Noise abatement
Equivalent circuits
Electric network topology
Heat sinks
Field effect transistors
25 Citations (Scopus)
Electrodes
Air
Electric fields
Voltage measurement
Partial discharges
19 Citations (Scopus)

DC pre-breakdown phenomena and breakdown characteristics in the presence of conducting particles in liquid nitrogen

Hara, M., Suehiro, J., Maeda, H. & Nakashima, H., Feb 1 2002, In : IEEE Transactions on Dielectrics and Electrical Insulation. 9, 1, p. 23-30 8 p.

Research output: Contribution to journalArticle

Liquid nitrogen
Electric breakdown
Powders
Charged particles
Contamination
7 Citations (Scopus)

Experimental study on the ac loss properties of two-strand parallel conductors composed of superconducting multifilamentary strands

Iwakuma, M., Tanaka, H. & Funaki, K., Nov 1 2002, In : Superconductor Science and Technology. 15, 11, p. 1537-1546 10 p.

Research output: Contribution to journalArticle

strands
coils
conductors
Critical currents
Shielding
2 Citations (Scopus)

Experimental study on the dependence of ac losses in superconducting parallel conductors on the distance between strands

Tanaka, H., Matsuda, K., Iwakuma, M., Kajikawa, K., Funaki, K., Konno, M., Nose, S., Ueyama, M., Hayashi, K. & Sato, K., Aug 1 2002, In : Physica C: Superconductivity and its applications. 372-376, PART 3, p. 1810-1813 4 p.

Research output: Contribution to journalArticle

strands
conductors
Aspect ratio
deviation
transformers
5 Citations (Scopus)

Fabrication of 1 kA class oxide superconducting transformer cooled by cryocooler for AC transport measurement

Otabe, E. S., Yasuda, T., Matsushita, T., Iwakuma, M. & Bohno, T., Aug 1 2002, In : Physica C: Superconductivity and its applications. 372-376, PART 3, p. 1711-1714 4 p.

Research output: Contribution to journalArticle

transformers
Oxides
alternating current
holders
Fabrication
6 Citations (Scopus)

Frequency dependence of AC magnetization in stacked Bi-2223 Ag-sheathed tapes

Kajikawa, K., Fukuda, Y., Moriyama, H., Hayashi, T., Iwakuma, M. & Funaki, K., Oct 15 2002, In : Physica C: Superconductivity and its applications. 382, 1, p. 122-126 5 p.

Research output: Contribution to journalArticle

Tapes
tapes
Magnetization
alternating current
magnetization
6 Citations (Scopus)

Generation, growth and collapse of bubbles on collision of particle with electrode in Dc electrically stressed liquid helium

Hara, M., Nakagawa, H., Shinohara, T. & Suehiro, J., Dec 1 2002, In : IEEE Transactions on Dielectrics and Electrical Insulation. 9, 6, p. 910-921 12 p.

Research output: Contribution to journalArticle

Helium
Bubbles (in fluids)
Kinetic energy
Electrodes
Liquids
4 Citations (Scopus)

Quantitative evaluation of perpendicular-field losses in stacked high-Tc superconducting tapes

Kajikawa, K., Nishimura, M., Moriyama, H., Iwakuma, M. & Funaki, K., Nov 30 2002, In : Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi). 141, 3, p. 50-57 8 p.

Research output: Contribution to journalArticle

Superconducting tapes
Wire
Tapes
Magnetic fields
Demagnetization
10 Citations (Scopus)

Test results of a HTS power transformer connected to a power grid

Kimura, H., Honda, K., Hayashi, H., Tsutsumi, K., Iwakuma, M., Funaki, K., Bohno, T., Tomioka, A., Yagi, Y., Maruyama, H. & Ohashi, K., Aug 1 2002, In : Physica C: Superconductivity and its applications. 372-376, PART 3, p. 1694-1697 4 p.

Research output: Contribution to journalArticle

Power transformers
transformers
grids
Electric substations
prototypes
9 Citations (Scopus)

Theoretical analysis on ac loss properties of two-strand parallel conductors composed of superconducting multifilamentary strands

Iwakuma, M., Tanaka, H. & Funaki, K., Nov 1 2002, In : Superconductor Science and Technology. 15, 11, p. 1525-1536 12 p.

Research output: Contribution to journalArticle

strands
conductors
Magnetic fields
Shielding
shielding

Theoretical evaluation of perpendicular-field losses in stacked high-Tc superconducting tapes

Kajikawa, K., Nishimura, M., Moriyama, H., Iwakuma, M. & Funaki, K., Oct 1 2002, In : Physica C: Superconductivity and its applications. 378-381, PART 2, p. 1122-1127 6 p.

Research output: Contribution to journalArticle

Superconducting tapes
Tapes
tapes
evaluation
Demagnetization
2001
1 Citation (Scopus)

AC loss properties of Bi-2212 Rutherford-type cables

Fukuda, Y., Matsumura, M., Kajikawa, K., Iwakuma, M., Funaki, K., Hasegawa, T., Kasahara, H., Akita, S. & Sakaguchi, H., Sep 1 2001, In : Physica C: Superconductivity and its applications. 357-360, SUPPL. 1, p. 1263-1266 4 p.

Research output: Contribution to journalArticle

cables
alternating current
Cables
strands
filaments
1 Citation (Scopus)

A new experimental technique to evaluate perpendicular-field losses of superconducting tape wires with meter-class length

Kajikawa, K., Nishimura, M., Moriyama, H., Iwakuma, M. & Funaki, K., Sep 1 2001, In : Physica C: Superconductivity and its applications. 357-360, SUPPL. 1, p. 1201-1204 4 p.

Research output: Contribution to journalArticle

Superconducting tapes
tapes
wire
Wire
coils
17 Citations (Scopus)

Balanced switching converter to reduce common-mode conducted noise

Shoyama, M., Okunaga, T., Li, G. & Ninomiya, T., 2001, In : Unknown Journal. 1, p. 451-456 6 p.

Research output: Contribution to journalArticle

topology
drain
Electric network topology
Heat sinks
Noise abatement
6 Citations (Scopus)

Common-mode noise reduction in DC-DC converters by common-source type active-clamp technique

Li, G., Shoyama, M., Ninomiya, T. & Inoue, T., Jan 1 2001, In : PESC Record - IEEE Annual Power Electronics Specialists Conference. 4, p. 1773-1778 6 p.

Research output: Contribution to journalArticle

Pulse transformers
clamps
DC-DC Converter
Noise Reduction
Clamping devices
8 Citations (Scopus)

Design study of a 1 GJ class HTS-SMES (1): Conceptual design of a magnet system

Hayashi, H., Tsutsumi, K., Funaki, K., Iwakuma, M., Tasaki, K., Sumiyoshi, Y. & Tezuka, M., Sep 2001, In : Physica C: Superconductivity and its applications. 357-360, p. 1327-1331 5 p.

Research output: Contribution to journalArticle

Conceptual design
Magnets
magnets
Magnetic fields
power lines
9 Citations (Scopus)

Design study of a 3.6 MJ HTS-SMES: Compact magnet design

Tasaki, K., Sumiyoshi, Y., Tezuka, M., Hayashi, H., Tsutsumi, K., Funaki, K. & Iwakuma, M., Sep 2001, In : Physica C: Superconductivity and its applications. 357-360, p. 1332-1335 4 p.

Research output: Contribution to journalArticle

Magnets
magnets
coils
Superconducting magnets
superconducting magnets
14 Citations (Scopus)

PD characteristics in an air-filled void at room temperature under superimposed sinusoidal voltages

Kurihara, T., Tsuru, S., Imasaka, K., Suehiro, J. & Hara, M., Apr 1 2001, In : IEEE Transactions on Dielectrics and Electrical Insulation. 8, 2, p. 269-275 7 p.

Research output: Contribution to journalArticle

Electric potential
Air
Temperature
Partial discharges
Surface charge
10 Citations (Scopus)

Pressurizing and sub-cooling effects on electrical breakdown of LN2 in modeled HTS coils

Seok, B. Y., Komatsu, H., Kushinaga, M., Suehiro, J. & Hara, M., Dec 1 2001, In : IEEE Transactions on Dielectrics and Electrical Insulation. 8, 6, p. 1016-1024 9 p.

Research output: Contribution to journalArticle

Pressurization
Liquid nitrogen
Insulation
Cooling
Partial discharges
Static analysis
Dynamic analysis
Controllers
Experiments
1 Citation (Scopus)

The effective resistance between twisted superconducting filaments in tapes

Takács, S., Iwakuma, M. & Funaki, K., May 1 2001, In : Physica C: Superconductivity and its applications. 354, 1-4, p. 265-269 5 p.

Research output: Contribution to journalArticle

Tapes
tapes
filaments
Silver
Superconducting materials
12 Citations (Scopus)
alternating current
coils
Magnetic fields
magnetic fields
Phase shift
2000
10 Citations (Scopus)

Analysis of abnormal phenomena caused by synchronous rectifiers in a paralleled converter system

Kohama, T., Ninomiya, T., Tymerski, R. & Shoyama, M., Jul 1 2000, In : IEEE Transactions on Power Electronics. 15, 4, p. 670-680 11 p.

Research output: Contribution to journalArticle

Energy dissipation
Electric potential
Experiments

Analysis of a series-resonant converter with ZVS-PWM control

Tanaka, H., Yamane, T., Ninomiya, T., Shoyama, M. & Zaitsu, T., Jan 1 2000, In : Electronics and Communications in Japan, Part II: Electronics (English translation of Denshi Tsushin Gakkai Ronbunshi). 83, 1, p. 59-65 7 p.

Research output: Contribution to journalArticle

Zero voltage switching
pulse duration modulation
Pulse width modulation
converters
Switching frequency
Magnetic levitation vehicles
Linear motors
Induction motors
Propulsion
Water
4 Citations (Scopus)

Energy efficiency improvement of electrical sterilization using oscillatory waveforms from a RLC discharging circuit

Lee, H. K., Suehiro, J., Hara, M., Lee, D. C. & So, M. H., Dec 1 2000, In : IEEE Transactions on Dielectrics and Electrical Insulation. 7, 6, p. 872-874 3 p.

Research output: Contribution to journalArticle

Inductance
Energy efficiency
Networks (circuits)
Escherichia coli
Capacitors
5 Citations (Scopus)

Partial and complete electrical breakdown in simulated high temperature superconducting coils

Seok, B. Y., Komatsu, H., Suehiro, J., Hara, M. & Okamoto, H., Jan 1 2000, In : IEEE Transactions on Dielectrics and Electrical Insulation. 7, 1, p. 78-86 9 p.

Research output: Contribution to journalArticle

Insulation
Liquid nitrogen
Electrodes
Cooling
Glass fiber reinforced plastics
16 Citations (Scopus)

Recent activities for applications to HTS transformers in Japan

Funaki, K. & Iwakuma, M., Jan 1 2000, In : Superconductor Science and Technology. 13, 1, p. 60-67 8 p.

Research output: Contribution to journalArticle

Liquid nitrogen
transformers
Japan
liquid nitrogen
Conceptual design
5 Citations (Scopus)

Reduction of the source size of gas-puff z-pinch plasmas using an inductive pulsed power system

Imasaka, K., Kawazoe, K., Kawauchi, K., Hara, S., Suehiro, J. & Hara, M., Jan 1 2000, In : Review of Scientific Instruments. 71, 12, p. 4438-4444 7 p.

Research output: Contribution to journalArticle

plasma pinch
fuses
electric generators
Plasmas
Electric fuses
1 Citation (Scopus)

Some factors determining the effective resistance between strands in flat cables (or superconducting filaments in tapes)

Takács, S., Iwakuma, M. & Funaki, K., Apr 1 2000, In : Superconductor Science and Technology. 13, 4, p. 405-411 7 p.

Research output: Contribution to journalArticle

Flat cables
strands
Tapes
cables
tapes
1999
33 Citations (Scopus)

Development of a IT cryocooler-cooled pulse coil with a Bi2223 superconducting parallel conductor for SMES

Iwakuma, M., Funaki, K., Kajikawa, K., Kanetaka, H., Hayashi, H., Tsutsumi, K., Tomioka, A., Konno, M. & Nose, S., Dec 1 1999, In : IEEE Transactions on Applied Superconductivity. 9, 2 PART 1, p. 928-931 4 p.

Research output: Contribution to journalArticle

coils
conductors
strands
pulses
heat
1 Citation (Scopus)

Effect of a thin insulation film on thermal bubble-triggered breakdown phenomena in liquid nitrogen

Takano, K., Matsuura, S., Jiang, Y., Suehiro, J. & Hara, M., Jun 1 1999, In : Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi). 127, 4, p. 18-28 11 p.

Research output: Contribution to journalArticle

Liquid nitrogen
Electric breakdown
Insulation
Boiling liquids
Electrodes
6 Citations (Scopus)

Experimental results of the model coil for cooling design of a 1T cryocooler-cooled pulse coil for SMES

Tomioka, A., Bohno, T., Nose, S., Konno, M., Iwakuma, M., Funaki, K., Kajikawa, K., Kanetaka, H., Hayashi, H. & Tsutsumi, K., Dec 1 1999, In : IEEE Transactions on Applied Superconductivity. 9, 2 PART 1, p. 932-935 4 p.

Research output: Contribution to journalArticle

coils
Cooling
cooling
pulses
Epoxy Resins
Superfluid helium
Helium
Electrodes
Weibull distribution
Liquids
14 Citations (Scopus)

Influences of geometrical configuration on AC loss measurement with pickup-coil method

Kajikawa, K., Iwakuma, M., Funaki, K., Wada, M. & Takenaka, A., Dec 1 1999, In : IEEE Transactions on Applied Superconductivity. 9, 2 PART 1, p. 746-749 4 p.

Research output: Contribution to journalArticle

Pickups
alternating current
coils
sensors
configurations
coils
wire
Wire
electromagnetism
configurations
7 Citations (Scopus)

PD characteristics and mechanisms in artificial air-filled voids at room and liquid nitrogen temperatures

Tsuru, S., Nakamura, M., Mine, T., Sakai, K., Suehiro, J. & Hara, M., Dec 1 1999, In : IEEE Transactions on Dielectrics and Electrical Insulation. 6, 1, p. 43-50 8 p.

Research output: Contribution to journalArticle

Partial discharges
Liquid nitrogen
Air
Temperature
Condensation

Possible solution of the "single strand stability" problem - special cable design

Vysotsky, V. S., Ilyin, Y. A., Kajikawa, K., Funaki, K., Iwakuma, M., Takeo, M. & Kumano, T., Dec 1 1999, In : IEEE Transactions on Applied Superconductivity. 9, 2 PART 1, p. 1121-1124 4 p.

Research output: Contribution to journalArticle

strands
cables
Superconducting cables
Cables
alternating current
128 Citations (Scopus)

Quantitative estimation of biological cell concentration suspended in aqueous medium by using dielectrophoretic impedance measurement method

Suehiro, J., Yatsunami, R., Hamada, R. & Hara, M., Nov 7 1999, In : Journal of Physics D: Applied Physics. 32, 21, p. 2814-2820 7 p.

Research output: Contribution to journalArticle

impedance measurement
Electrodes
electrodes
Acoustic impedance
Escherichia
1 Citation (Scopus)

Quench characteristics of parallel circuit of two mechanical PCS's

Ohtsuka, S., Nakamura, T., Tsuji, D., Suehiro, J. & Hara, M., Dec 1 1999, In : IEEE Transactions on Applied Superconductivity. 9, 2 PART 1, p. 1085-1088 4 p.

Research output: Contribution to journalArticle

switches
Switches
Networks (circuits)
Contact resistance
Numerical analysis
1 Citation (Scopus)

Quench time lag and its statistical characteristics of NbTi mechanical PCS measured with pulsed current

Suehiro, J., Tsuji, D., Tsutsumi, K., Ohtsuka, S. & Hara, M., Dec 1 1999, In : IEEE Transactions on Applied Superconductivity. 9, 2 PART 1, p. 1125-1128 4 p.

Research output: Contribution to journalArticle

Weibull distribution
Critical currents
Distribution functions
Time delay
time lag
5 Citations (Scopus)

Steady-state characteristics of the push-pull piezoelectric inverter

Shoyama, M., Horikoshi, K., Ninomiya, T., Zaitsu, T. & Sasaki, Y., 1999, In : IEICE Transactions on Communications. E82-B, 8, p. 1318-1324 7 p.

Research output: Contribution to journalArticle

Zero voltage switching
Fluorescent lamps
Electric current control
Equivalent circuits
Cathodes
1998
DC-DC converters
Electric potential
Experiments
1 Citation (Scopus)

Alteration of egg character in the wemi mutation of Bombyx mori by the application of 20-hydroxyecdysone

Kawaguchi, Y., Iwakuma, M., Banno, Y. & Koga, K., 1998, In : Journal of Sericultural Science of Japan. 67, 1, p. 31-35 5 p.

Research output: Contribution to journalArticle

Ecdysterone
Bombyx
ecdysterone
Hormones
Bombyx mori
2 Citations (Scopus)

A simple electromagnetic method of cyclic loss measurement for superconducting wires in a combined alternating transverse magnetic field and transport current

Funaki, K., Kajikawa, K., Shiraishi, H., Iwakuma, M., Miyake, S., Kumano, T. & Hasegawa, T., Jan 1 1998, In : Physica C: Superconductivity and its Applications. 310, 1-4, p. 132-136 5 p.

Research output: Contribution to journalArticle

Superconducting wire
coils
wire
Magnetic fields
electromagnetism