Research Output 1983 2019

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Conference article
2019

Numerical analysis on the influence of armature winding configuration on AC loss of 10 MW fully superconducting generators of electric aircrafts

Komiya, M., Aikawa, T., Yoshida, K., Miura, S., Iwakuma, M., Yoshida, T., Sasayama, T., Tomioka, A., Konno, M. & Izumi, T., Oct 15 2019, In : Journal of Physics: Conference Series. 1293, 1, 012074.

Research output: Contribution to journalConference article

Open Access
fly by wire control
armatures
numerical analysis
alternating current
generators
2018
1 Citation (Scopus)

AC Loss Property of Stacked REBCO Superconducting Multifilamentary Tapes under Perpendicular Magnetic Field

Sasa, H., Ito, T., Iwakuma, M., Miura, S., Izumi, T., MacHi, T. & Ibi, A., Jul 26 2018, In : Journal of Physics: Conference Series. 1054, 1, 012037.

Research output: Contribution to journalConference article

tapes
alternating current
magnetic fields
filaments
scoring

Development of Tri-axial superconducting cable system for type test

Kitamura, T., Adachi, K., Sugane, H., Nakanishi, T., Aoki, Y., Mido, N., Iwakuma, M. & Hasegawa, T., Jul 26 2018, In : Journal of Physics: Conference Series. 1054, 1, 012075.

Research output: Contribution to journalConference article

cables
liquid nitrogen
breakdown
insulation
electric potential
1 Citation (Scopus)

Magnetometer based on transfer and modulation of magnetic flux using high-critical-temperature superconductor coils

Enpuku, K., Matsuo, M., Yoshida, Y., Yamashita, S., Sasayama, T. & Yoshida, T., Jul 26 2018, In : Journal of Physics: Conference Series. 1054, 1, 012058.

Research output: Contribution to journalConference article

magnetometers
magnetic flux
critical temperature
coils
modulation
2017
2 Citations (Scopus)

Characterization of Si thin films doped by wet-chemical laser processing

Suwa, A., Tanaka, N., Sadoh, T., Nakamura, D. & Ikenoue, H., Jan 1 2017, In : Digest of Technical Papers - SID International Symposium. 48, 1, p. 430-432 3 p.

Research output: Contribution to journalConference article

Chemical lasers
Doping (additives)
Thin films
Processing
Ion implantation
2016
1 Citation (Scopus)

Design of passive interconnections in tall buildings subject to earthquake disturbances to suppress inter-storey drifts

Yamamoto, K. & Smith, M. C., Oct 3 2016, In : Journal of Physics: Conference Series. 744, 1, 012063.

Research output: Contribution to journalConference article

disturbances
earthquakes
transfer functions
dampers
resonant frequencies
1 Citation (Scopus)

Parametric investigation of substrate temperatures on the properties of Zinc oxide deposited over a flexible polymeric substrate via spray technique

Rajagopalan, P., Gagrani, R., Nakamura, D., Okada, T., Singh, V. & Palani, I. A., Oct 11 2016, In : IOP Conference Series: Materials Science and Engineering. 149, 1, 012069.

Research output: Contribution to journalConference article

Zinc Oxide
Zinc oxide
Substrates
Spray pyrolysis
Spraying

Super low temperature doping of phosphorus to Poly-Si thin films using XeF excimer laser irradiation in phosphoric acid solution

Suwa, A., Ikenoue, H., Oizumi, H., Nakamura, D. & Okada, T., Jan 1 2016, In : Digest of Technical Papers - SID International Symposium. 47, 1, p. 1206-1209 4 p.

Research output: Contribution to journalConference article

Phosphoric acid
Excimer lasers
Laser beam effects
Polysilicon
Phosphorus
2015

Development of cooling system for 66/6.9kV-20MVA REBCO superconducting transformers with Ne turbo-Brayton refrigerator and subcooled liquid nitrogen

Iwakuma, M., Adachi, K., Yun, K., Yoshida, K., Sato, S., Suzuki, Y., Umeno, T., Konno, M., Hayashi, H., Eguchi, T., Izumi, T. & Shiohara, Y., Dec 18 2015, In : IOP Conference Series: Materials Science and Engineering. 101, 1, 012026.

Research output: Contribution to journalConference article

Cryostats
Refrigerators
Liquid nitrogen
Cooling systems
Natural convection
2014
1 Citation (Scopus)

A unified model for the multi-level virtual conductor

Ramadan, H. A. & Shoyama, M., Jan 1 2014, In : INTELEC, International Telecommunications Energy Conference (Proceedings). 2014-January, January, 6972202.

Research output: Contribution to journalConference article

Controllers
Electric potential
DC-DC converters
Transient analysis
Frequency response
3 Citations (Scopus)

DNA Detection using Microbeads-based Dielectrophoretic Impedance Measurement

Nakano, M., Ding, Z., Kasahara, H. & Suehiro, J., Dec 12 2014, In : Proceedings of IEEE Sensors. 2014-December, December, p. 1010-1013 4 p., 6985174.

Research output: Contribution to journalConference article

Electrophoresis
DNA
immobilization
polymerase chain reaction
Microelectrodes
2012

Development of REBCO superconducting transformers with current limiting function

Tsutsumi, T., Tomioka, A., Iwakuma, M., Okamoto, H., Gosho, Y., Hayashi, H., Iijima, Y., Saito, T., Ohkuma, T., Tagomori, A., Izumi, T. & Shiohara, Y., Jan 1 2012, In : Physics Procedia. 36, p. 1115-1120 6 p.

Research output: Contribution to journalConference article

transformers
tapes
critical current
flow resistance
scoring
1 Citation (Scopus)

Improved poynting's vector method: Ac loss measurement of HTS tapes formed into a short straight or a solenoidal coil

Sumiyoshi, F., Kawagoe, A., Haeyama, Y., Sakuda, H., Mukai, M., Iwakuma, M., Izumi, T. & Shiohara, Y., Jan 1 2012, In : Physics Procedia. 36, p. 1534-1539 6 p.

Research output: Contribution to journalConference article

tapes
coils
sensors
liquid nitrogen
data acquisition
2 Citations (Scopus)

Performance of pickup coil made of Litz wire and coupled to HTS SQUID

Enpuku, K., Momotomi, R., Mihaya, T., Matsuo, M., Yoshida, T., Kandori, A., Tanabe, K., Adachi, S. & Tsukamoto, A., Jan 1 2012, In : Physics Procedia. 36, p. 400-404 5 p.

Research output: Contribution to journalConference article

coils
wire
sensors
thermal noise
ramps
2011
6 Citations (Scopus)

Improvement of dielectrophoretic impedance measurement method by bacterial concentration utilizing negative dielectrophoresis

Hamada, R., Takayama, H., Shonishi, Y., Hisajima, T., Mao, L., Nakano, M. & Suehiro, J., Jan 1 2011, In : Journal of Physics: Conference Series. 307, 1, 012031.

Research output: Contribution to journalConference article

impedance measurement
electrical impedance
cells
chambers
simulation
2009
3 Citations (Scopus)

Automated spectroscopic imaging of oxygen saturation in human retinal vessels

Nakamura, D., Sueda, S., Matsuoka, N., Yoshinaga, Y., Enaida, H., Okada, T. & Ishibashi, T., May 13 2009, In : Progress in Biomedical Optics and Imaging - Proceedings of SPIE. 7163, 71631N.

Research output: Contribution to journalConference article

Retinal Vessels
vessels
Oxygen
saturation
Imaging techniques
4 Citations (Scopus)

Dynamics of debris from laser-irradiated Sn droplet for EUV lithography light source

Okazaki, K., Nakamura, D., Akiyama, T., Toya, K., Takahashi, A. & Okada, T., May 25 2009, In : Proceedings of SPIE - The International Society for Optical Engineering. 7201, 72010T.

Research output: Contribution to journalConference article

Extreme ultraviolet lithography
Extreme Ultraviolet Lithography
debris
Debris
Droplet
2008
5 Citations (Scopus)

Comparative study on EUV and debris emission from CO 2 and Nd: YAG laser-produced tin plasmas

Takahashi, A., Nakamura, D., Tamaru, K., Akiyama, T. & Okada, T., Jun 12 2008, In : Journal of Physics: Conference Series. 112, Part 4, 042059.

Research output: Contribution to journalConference article

debris
YAG lasers
tin
lithography
lasers
2005
4 Citations (Scopus)

Ac loss characteristics of YBCO superconducting tapes fabricated by TFA-MOD technique

Iwakuma, M., Nigo, M., Inoue, D., Miyamoto, N., Kiss, T., Funaki, K., Iijima, Y., Saitoh, T., Izumi, T., Yamada, Y. & Shiohara, Y., Oct 7 2005, In : Physica C: Superconductivity and its applications. 426-431, II, p. 1276-1283 8 p.

Research output: Contribution to journalConference article

Superconducting tapes
tapes
Tapes
Magnetic fields
magnetic fields

ECH plasma experiments on an internal coil device with a high temperature superconductor coil

Ogawa, Y., Morikawa, J., Ohkuni, K., Yamakoshi, S., Goto, T., Mito, T., Yanagi, N. & Iwakuma, M., Jan 1 2005, In : Fusion Science and Technology. 47, p. 63-70 8 p.

Research output: Contribution to journalConference article

High temperature superconductors
high temperature superconductors
coils
Plasma flow
Plasmas

Initiation of thermal runaway in a 1 T cryocooler-cooled oxide superconducting pulsed coil in AC operation

Miyazaki, H., Harada, S., Iwakuma, M., Funaki, K., Hayashi, H. & Tomioka, A., Oct 6 2005, In : Physica C: Superconductivity and its applications. 426-431, II, p. 1397-1401 5 p.

Research output: Contribution to journalConference article

Oxides
alternating current
coils
oxides
heat generation
4 Citations (Scopus)

Magnetization loss properties of thin superconducting tapes with field-dependent critical current

Kajikawa, K., Hayashi, T., Nakamura, D. & Funaki, K., Oct 7 2005, In : Physica C: Superconductivity and its applications. 426-431, II, p. 1295-1301 7 p.

Research output: Contribution to journalConference article

Superconducting tapes
Critical currents
Tapes
tapes
Magnetization
4 Citations (Scopus)

Numerical calculations of AC losses in parallel tape conductors with fixed share of transport current in external magnetic field

Hayashi, T., Kajikawa, K., Iwakuma, M. & Funaki, K., Oct 7 2005, In : Physica C: Superconductivity and its applications. 426-431, II, p. 1328-1332 5 p.

Research output: Contribution to journalConference article

strands
Tapes
tapes
alternating current
conductors
2004
12 Citations (Scopus)

Mchanism of common-mode noise reduction in balanced boost switching converter

Shoyama, M., Tsumura, T. & Ninomiya, T., Nov 29 2004, In : PESC Record - IEEE Annual Power Electronics Specialists Conference. 2, p. 1115-1120 6 p.

Research output: Contribution to journalConference article

Noise abatement
Capacitance
Electric network topology
Networks (circuits)
Heat sinks
2003
10 Citations (Scopus)

Ac loss properties of a 4 kJ conduction-cooled pulse coil wound with a Bi2223 6-strand parallel conductor for SMES

Iwakuma, M., Miyazaki, H., Fukuda, Y., Kajikawa, K., Funaki, K., Tsutsumi, K., Hayashi, H., Kimura, H., Tomioka, A., Bohno, T. & Yagi, Y., Jun 1 2003, In : IEEE Transactions on Applied Superconductivity. 13, 2 II, p. 1882-1885 4 p.

Research output: Contribution to journalConference article

Helium
strands
coils
conductors
Gases
13 Citations (Scopus)

Application of common-soure active-clamp cincuit to various DC-DC converter topologies

Shoyama, M., Li, G. & Ninomiya, T., Aug 22 2003, In : PESC Record - IEEE Annual Power Electronics Specialists Conference. 3, p. 1321-1326 6 p.

Research output: Contribution to journalConference article

Clamping devices
DC-DC converters
topology
Topology
Networks (circuits)
11 Citations (Scopus)

Engineering design of the Mini-RT device

Mito, T., Yanagi, N., Hishinuma, Y., Ogawa, Y., Morikawa, J., Ohkuni, K., Iwakuma, M., Uede, T., Nose, S., Itoh, I. & Fukui, S., Jun 1 2003, In : IEEE Transactions on Applied Superconductivity. 13, 2 II, p. 1500-1503 4 p.

Research output: Contribution to journalConference article

coils
engineering
Plasmas
levitation
Experiments
6 Citations (Scopus)

Excitation test results of the HTS floating coil for the mini-RT project

Yanagi, N., Mito, T., Hishinuma, Y., Ogawa, Y., Morikawa, J., Ohkuni, K., Iwakuma, M., Uede, T., Nose, S. & Itoh, I., Jun 1 2003, In : IEEE Transactions on Applied Superconductivity. 13, 2 II, p. 1504-1507 4 p.

Research output: Contribution to journalConference article

Plasma confinement
Helium
Cryostats
High temperature superconductors
Tapes
6 Citations (Scopus)

Fabrication and test of a 4 kJ Bi-2223 pulse coil for SMES

Hayashi, H., Kimura, H., Hatabe, Y., Tsutsumi, K., Tomioka, A., Bohno, T., Nose, S., Yagi, Y., Ishii, T., Iwakuma, M. & Funaki, K., Jun 1 2003, In : IEEE Transactions on Applied Superconductivity. 13, 2 II, p. 1867-1870 4 p.

Research output: Contribution to journalConference article

coils
Fabrication
fabrication
pulses
power lines
5 Citations (Scopus)

Fabrication of winding model of high-Tc superconducting transformer for railway rolling stock

Kamijo, H., Hata, H., Fujimoto, H., Bohno, T., Sakaki, K., Yamada, H., Iwakuma, M. & Funaki, K., Jun 1 2003, In : IEEE Transactions on Applied Superconductivity. 13, 2 II, p. 2337-2340 4 p.

Research output: Contribution to journalConference article

transformers
Solenoids
coils
solenoids
Fabrication
4 Citations (Scopus)

Influence of vacuum region on AC losses in superconducting wires with 2D FEM formulated by self-magnetic field

Kajikawa, K., Hayashi, T., Yoshida, R., Iwakuma, M. & Funaki, K., Oct 1 2003, In : Physica C: Superconductivity and its applications. 392-396, PART 2, p. 1113-1117 5 p.

Research output: Contribution to journalConference article

Superconducting wire
alternating current
wire
Vacuum
Magnetic fields
5 Citations (Scopus)

Magnetic field angular dependence of AC losses in Bi-2223 superconducting wires

Iwakuma, M., Fukuda, Y., Fukui, M., Kajikawa, K. & Funaki, K., Oct 1 2003, In : Physica C: Superconductivity and its Applications. 392-396, PART 2, p. 1096-1101 6 p.

Research output: Contribution to journalConference article

Superconducting wire
tapes
Superconducting tapes
alternating current
wire

Nanoscale and femtogram trace element analysis using soft laser ablation fluorescence spectroscopy

Oki, Y., Takao, T., Higotani, T., Nakamura, D. & Maeda, M., Jan 1 2003, In : OSA Trends in Optics and Photonics Series. 88, p. 1854-1855 2 p.

Research output: Contribution to journalConference article

fluorescence spectroscopy
Surface analysis
Fluorescence spectroscopy
Excimer lasers
Laser ablation
45 Citations (Scopus)

Numerical evaluation of AC losses in HTS wires with 2D FEM formulated by self magnetic field

Kajikawa, K., Hayashi, T., Yoshida, R., Iwakuma, M. & Funaki, K., Jun 1 2003, In : IEEE Transactions on Applied Superconductivity. 13, 2 III, p. 3630-3633 4 p.

Research output: Contribution to journalConference article

Superconducting wire
alternating current
critical temperature
finite element method
wire
7 Citations (Scopus)

Thermal stability of a cryocooler-cooled HTS pancake coil wound with Bi2223 tape

Tasaki, K., Kuriyama, T., Nomura, S., Sumiyoshi, Y., Hayashi, H., Kimura, H., Tsutsumi, K., Iwakuma, M. & Funaki, K., Oct 1 2003, In : Physica C: Superconductivity and its applications. 392-396, PART 2, p. 1210-1213 4 p.

Research output: Contribution to journalConference article

Tapes
tapes
Thermodynamic stability
thermal stability
coils
2002
17 Citations (Scopus)

A dielectrophoretic filter for separation and collection of fine particles suspended in liquid

Zhou, G., Imamura, M., Suehiro, J. & Hara, M., Jan 1 2002, In : Conference Record - IAS Annual Meeting (IEEE Industry Applications Society). 2, p. 1404-1411 8 p.

Research output: Contribution to journalConference article

Electrophoresis
Liquids
Yeast
Electrodes
Cells
4 Citations (Scopus)

Application of high temperature superconductor in National Institute for Fusion Science

Mito, T., Chikaraishi, H., Hamaguchi, S., Heller, R., Imagawa, S., Ishibashi, K., Iwakuma, M., Iwamoto, A., Maehata, K., Maekawa, R., Morikawa, J., Motojima, O., Nishimura, A., Ogawa, Y., Satow, T., Shintomi, T., Tachikawa, K., Takahata, K., Tamura, H., Yamada, S. & 2 others, Yamada, Y. & Yanagi, N., Mar 1 2002, In : IEEE Transactions on Applied Superconductivity. 12, 1, p. 606-610 5 p.

Research output: Contribution to journalConference article

High temperature superconductors
high temperature superconductors
Fusion reactions
fusion
Magnetic levitation
6 Citations (Scopus)

Engineering research and development of magnetically levitated high-temperature superconducting coil system for mini-RT project

Yanagi, N., Morikawa, J., Mito, T., Ogawa, Y., Hamaguchi, S., Chikaraishi, H., Iwakuma, M., Uede, T., Itoh, I., Nose, S. & Fukui, S., Mar 1 2002, In : IEEE Transactions on Applied Superconductivity. 12, 1, p. 948-951 4 p.

Research output: Contribution to journalConference article

Engineering research
research and development
Tapes
coils
engineering
3 Citations (Scopus)

Feasibility study of oxide superconducting transformers for Shinkansen rolling stock

Iwakuma, M., Matsumura, K., Miyazaki, H., Kajikawa, K., Funaki, K., Hata, H., Fujimoto, H. & Kamijo, H., Mar 1 2002, In : IEEE Transactions on Applied Superconductivity. 12, 1, p. 828-832 5 p.

Research output: Contribution to journalConference article

Superconducting wire
transformers
Oxides
oxides
Critical currents
2001
64 Citations (Scopus)

Ac loss properties of a 1MVA single-phase HTS power transformer

Iwakuma, M., Funaki, K., Kajikawa, K., Tanaka, H., Bohno, T., Tomioka, A., Yamada, H., Nose, S., Konno, M., Yagi, Y., Maruyama, H., Ogata, T., Yoshida, S., Ohashi, K., Tsutsumi, K. & Honda, K., Mar 1 2001, In : IEEE Transactions on Applied Superconductivity. 11, 1 II, p. 1482-1485 4 p.

Research output: Contribution to journalConference article

Power transformers
transformers
Liquid nitrogen
liquid nitrogen
Thermal load
73 Citations (Scopus)

Development of a 22kV/6.9kV single-phase model for a 3MVA HTS power transformer

Funaki, K., Iwakuma, M., Kajikawa, K., Hara, M., Suehiro, J., Ito, T., Takata, Y., Bohno, T., Nose, S. I., Konno, M., Yagi, Y., Maruyama, H., Ogata, T., Yoshida, S., Ohashi, K., Kimura, H. & Tsutsumi, K., Mar 1 2001, In : IEEE Transactions on Applied Superconductivity. 11, 1 II, p. 1578-1581 4 p.

Research output: Contribution to journalConference article

Power transformers
transformers
Liquid nitrogen
Tapes
field tests
15 Citations (Scopus)

Numerical simulation for AC losses of HTS tapes in combined alternating transport current and external AC magnetic field with phase shift

Kajikawa, K., Takenaka, A., Kawasaki, K., Iwakuma, M. & Funaki, K., Mar 1 2001, In : IEEE Transactions on Applied Superconductivity. 11, 1 II, p. 2240-2243 4 p.

Research output: Contribution to journalConference article

Phase shift
Tapes
tapes
alternating current
phase shift

Polarity effect on the behaviour of gas puff z-pinch plasma produced by IPP system

Imasaka, K., Takahashi, K., Suehiro, J. & Hara, M., Jan 1 2001, In : IEEE International Conference on Plasma Science.

Research output: Contribution to journalConference article

plasma pinch
polarity
plasma
gases
gas
4 Citations (Scopus)
Antigen-antibody reactions
Bacteria
Electrodes
Microelectrodes
Electrophoresis
2000
17 Citations (Scopus)

Current distribution in superconducting parallel conductors wound into pancake coils

Iwakuma, M., Nishimura, K., Kajikawa, K., Funaki, K., Hayashi, H., Tsutsumi, K., Tomioka, A., Konoo, M. & Nose, S., Jan 1 2000, In : IEEE Transactions on Applied Superconductivity. 10, 1, p. 861-864 4 p.

Research output: Contribution to journalConference article

current distribution
strands
coils
conductors
Fabrication
7 Citations (Scopus)

Mode of free-conducting particle motion and particle-triggered breakdown mechanism in non-uniform field gaps

Sakai, K. I., Abella, D. L., Suehiro, J., Hayashi, N. & Hara, M., Dec 1 2000, In : Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), Annual Report. 1, p. 389-392 4 p.

Research output: Contribution to journalConference article

Electric fields
Electrodes
Gases
1999
7 Citations (Scopus)

Magnetic-Field-Induced Transitions of Many-Electron States in Quantum Dots

Natori, A. & Nakamura, D., Jan 1 1999, In : Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers. 38, 1 B, p. 380-383 4 p.

Research output: Contribution to journalConference article

Electron transitions
electron states
Electron energy levels
Semiconductor quantum dots
quantum dots
1998
2 Citations (Scopus)

Abnormal phenomena caused by synchronous rectifiers in parallel-module DC-DC converter system

Kohama, T., Ninomiya, T. & Shoyama, M., Jan 1 1998, In : PESC Record - IEEE Annual Power Electronics Specialists Conference. 2, p. 1230-1236 7 p.

Research output: Contribution to journalConference article

DC-DC Converter
rectifiers
DC-DC converters
converters
modules
4 Citations (Scopus)

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

Kohama, T., Ninomiya, T., Shoyama, M. & Tymerski, R., Dec 1 1998, In : INTELEC, International Telecommunications Energy Conference (Proceedings). p. 404-411 8 p.

Research output: Contribution to journalConference article

DC-DC converters
Energy dissipation
oscillation
Electric potential
dissipation
4 Citations (Scopus)

Partial discharge inception characteristics in artificial air-filled voids at room and liquid nitrogen temperatures

Tsuru, S., Nakamura, M., Mine, T., Suehiro, J. & Hara, M., Jan 1 1998, In : Conference Record of IEEE International Symposium on Electrical Insulation. 1, p. 153-156 4 p.

Research output: Contribution to journalConference article

Partial discharges
Liquid nitrogen
Air
Temperature
Electric potential