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20 results on '"Itoh, Kikuo"'

1. Hoop stress tests of Bi-2223 coils

Author

Matsumoto, Shinji, Seyong Choi, Kiyoshi, Tsukasa, Otsuka, Akihiro, Itoh, Kikuo, and Asano, Toshihisa

Subjects
Electric coils -- Design and construction, Electric coils -- Mechanical properties, Electric currents -- Evaluation, Stress analysis (Engineering), Business, Electronics, Electronics and electrical industries
Abstract

Double pancake test coils are fabricated in order to examine the mechanical properties of Bi-2223 conductors under high hoop stress. The critical current of the high-[I.sub.c] test coil is shown to be 164 A, where the hoop stress is estimated at 323 MPa and the high-strength test coil has burst at a hoop stress of approximately 200 MPa.

Published
2008

2. The characteristics of Bi-2223/Ag conductor for high field application

Author

Seyong Choi, Kiyoshi, Tsukasa, Matsumoto, Shinji, Itoh, Kikuo, Hase, Takashi, Zaitsu, Kyoji, Hamada, Mamoru, and Sugano, Michinaka

Subjects
Bismuth -- Electric properties, Bismuth -- Magnetic properties, Magnetic fields -- Analysis, Nuclear magnetic resonance spectroscopy -- Analysis, Business, Electronics, Electronics and electrical industries
Abstract

The critical current and index value of Bi-2223/Ag superconductor is evaluated in high magnetic field. The Bi-2223/Ag conductor has reached enough potential to realize high field applications over 1 GHz NMR spectrometer.

Published
2008

3. Operation of a 920-MHz high-resolution NMR magnet at TML

Author

Kiyoshi, Tsukasa, Yoshikawa, Masatoshi, Sato, Akio, Itoh, Kikuo, Matsumoto, Shinji, Wada, Hitoshi, Ito, Satoshi, Miki, Takashi, Miyazaki, Takayoshi, Kamikado, Takeshi, Ozaki, Osamu, Hase, Takashi, Hamada, Mamoru, Hayashi, Seiji, Kawate, Yoshio, and Hirose, Ryoichi

Subjects
Nuclear magnetic resonance -- Research, Superconducting magnets -- Research, Business, Electronics, Electronics and electrical industries
Abstract

Operation of a 920-MHz high-resolution nuclear magnetic resonance (NMR) magnet at Tsukuba Magnet Laboratory (TML) is described and discussed.

Published
2003

4. Effect of Pd Seed Layer on Magnetic Anisotropy in Co Films Evaporated at Oblique Incidence

Author

Itoh, Kikuo, Tomita, Mitsutoshi, Takahashi, Shuhei, Akasaki, Keita, Ichikawa, Fusao, and Noguchi, Yoshie

Subjects
Condensed Matter::Materials Science, 563.6
Abstract

The effect of Pd seed layer on the magnetic anisotropy in Co films evaporated at oblique incidence was investigated. The thickness of Pd was 500Å and that of Co was varied from 100 to 600Å. The substrate temperatures were -60, -30 and 20℃. Negatively large anisotropy of the squareness ratio appeared in the films prepared at low substrate temperatures -60 and -30℃ thought the anisotropy of the reflection coefficient and the magnetic anisotropy field were positive. The degree of the c-axis orientation perpendicular to the incidence plane seems to be a little large than that of parallel one. From these results, it is considered that the positive in-plane magnetic anisotropy may originate from the shape anisotropy of the columnar grains and/or magnetocrystalline anisotropy, and the anisotropy of the squareness ratio does not reflect the in-place magnetic anisotropy. In the films with negatively large anisotropy of the squareness ratio, large coercive force perpendicular to the film plane appeared. The MH loop in those films can be explained to be superposition of two loops with small and large coercive forces. We consider that the coercive force of under Co layer is small and that of over Co layer large.

Published
2010

5. Magnetic Anisotropy in Pd/Co Films Evaporated at Oblique Incidence

Author

Itoh, Kikuo, Ichikawa, Fusao, Teshima, Daisukea, Tazoe, Mitsuru, Furukawa, Taketomo, Akasaki, Keita, Noguchi, Yoshiko, Kawahara, Saori, and Okamoto, Kunito

Subjects
563.6
Abstract

The effect of Pd seed layer on the magnetic anisotropy in Cobalt films evaporated at oblique incidence was investigated. The deposition rate of Pd layer R(Pd) was varied from 0.1 to 1.7Å/s and that of Co layers R(Co) was from 0.1 to 4.5Å/s. The incidence angle of Pd vapor beam was 30° and that of Co 60°. Negatively large magnetic anisotropy and large coercive force parallel to the incidence plane appeared in Pd/Co films evaporated at low deposition rates of Pd (0.1Å/s) and Co (0.2Å/s) and small thicknesses of Pd (100Å) and Co (about 140Å) layers. In these films the anisotropy of the reflection coefficient was positive though the magnetic anisotropy was negative. Therefore, it is considered that the negative magnetic anisotropy does not originate from the shape anisotropy of the columnar grains but the magnetocrystalline anisotropy through the textural structure.

Published
2008

7. Superconducting Properties and Strain Effects in High Fields for Bronze-Processed Multifilamentary (Nb, Ti)_3Sn Wires and Composite-Processed Ultrafine Filament Nb_3Al Wires(Low-T_c Superconducting Materials Research)

Author

Kamata, Kunihisa, Suzuki, Yoichi, Moriai, Hidezumi, Inoue, Kiyoshi, Itoh, Kikuo, Takeuchi, Takao, Tachikawa, Kyoji, Watanabe, Kazuo, Muto, Yoshio, Katagiri, Kazumune, Noto, Koshichi, and Okada, Toichi

Abstract

Multifilamentary (Nb, Ti)_3Sn wires supplied for Japan VAMAS standard samples showed non Cu Jc's over 350 A/mm^2 at 15 T, after optimum heat treatments at temperatures from 650℃ to 700℃. The upper critical field Hc2 is extrapolated to about 25 T, for these wires. The uniaxial strain dependence of Ic at 14 T for the (Nb, Ti)_3Sn wire was observed to be greatly reduced, due to the enhancement of Hc2 resulting from the incorporation of Ti into the Nb_3Sn layer. The Nb_3Al wire shows substantially smaller strain sensitivity of Ic as compared to that for the (Nb, Ti)_3 Sn wire.

Published
1992

8. Enhanced Concentration of the Magnetic Flux in a Superconducting Cylinder.

Author

Asano, Toshihisa, Itoh, Kikuo, Matsumoto, Shinji, Kiyoshi, Tsukasa, Wada, Hitoshi, and Kido, Giyuu

Subjects
*HIGH temperature superconductors, *MAGNETIC flux, *MAGNETIC fields, *SUPERCONDUCTORS, *ELECTRIC power, *ELECTRIC currents
Abstract

The performance of a flux concentrator using an YBCO oxide superconductor was tested to raise the steady state magnetic field generated by the existing magnet. This concentrator was composed of an outside hollow cylinder and a pair of half cylinders that goes in and out in the outside cylinder. This flux concentrator generated additional magnetic field more than 1.6 T for an applied magnetic field 28 T. [ABSTRACT FROM AUTHOR]

Published
2005
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9. Effects of Strain on the Critical Current of Bi-2223/Ag Tapes.

Author

Kitaguchi, Hitoshi, Nishioka, Jun-ichi, Hasegawa, Takayo, Itoh, Kikuo, Kumakura, Hiroaki, Togano, Kazumasa, and Wada, Hitoshi

Subjects
SUPERCONDUCTORS, CRITICAL currents, STRAINS & stresses (Mechanics)
Abstract

Examines the influence of tensile strain on the critical current of superconducting tapes. Bending deformation; Strain tolerance; Durability of the tapes against deformation.

Published
2002
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10. Persistent-Mode Operation of a 920 MHz High-Resolution NMR Magnet.

Author

Kiyoshi, Tsukasa, Sato, Akio, Takeuchi, Takao, Itoh, Kikuo, Matsumoto, Shinji, Ozaki, Osamu, Fukushima, Keiji, Wada, Hitoshi, Yoshikawa, Masatoshi, Kamikado, Takeshi, Ito, Satoshi, Miki, Takashi, Hase, Takashi, Hamada, Mamoru, Hayashi, Seiji, Kawate, Yoshio, and Hirose, Ryoichi

Subjects
SUPERCONDUCTING magnets, NUCLEAR magnetic resonance, MAGNETIC fields
Abstract

Examines the field performance of a high-resolution nuclear magnetic resonance superconducting magnet. Persistent-mode operation of the magnet; Field decay; Field homogeneity.

Published
2002
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13. Strain Effect in Bi-based Oxide/Ag Superconducting Tapes.

Author

Kitaguchi, Hitoshi, Itoh, Kikuo, Kumakura, Hiroaki, Takeuchi, Takao, Togano, Kazumasa, and Wada, Hitoshi

Subjects
*SUPERCONDUCTORS, *STRAINS & stresses (Mechanics)
Abstract

Examines strain effect in Bi-based oxide/silver superconducting tapes. Principle of strain generation; Thermal expansion of materials; Variation in steep degradation depending on the holding material.

Published
2001
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14. Current-Voltage Characteristics in a Superconducting Bi-2223 Tape in the Range of Very Low...

Author

Otabe, Edmund Soji, Kodama, Takeshi, Fukuda, Mitsuhiro, Matsushita, Teruo, and Itoh, Kikuo

Subjects
SUPERCONDUCTORS, ELECTRIC fields, ELECTRONICS
Abstract

Studies the current-voltage characteristics in a superconducting Bi-2223 tape in the range of very low electric field. Analysis by the flux creep-flow model; Flux pinning as the mechanism which governs the transport property in the superconducting tape; Critical current density measurements.

Published
2001
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15. Pinning Characteristics of (Nb,Ta)[sub 3]Sn Superconductors Produced by Nb/Ta-Sn Composite Process.

Author

Banno, Nobuya, Takeuchi, Takao, Itoh, Kikuo, Wada, Hitoshi, Matsumoto, Hidehiro, and Tachikawa, Kyoji

Subjects
MAGNETIC properties of superconductors, FLUX pinning
Abstract

Studies the flux pinning characteristics of (Nb, Ta)[sub 3]Sn superconductors produced by Nb/Ta-Sn composite process. Pinning force density measurements; Grain boundary distribution; Peak effect at high reduced magnetic field.

Published
2001
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16. Development and Operation of Superconducting NMR Magnet beyond 900 MHz.

Author

Kiyoshi, Tsukasa, Sato, Akio, Takeuchi, Takao, Itoh, Kikuo, Matsumoto, Shinji, Ozaki, Osamu, Wada, Hitoshi, Yoshikawa, Masatoshi, Kamikado, Takeshi, Ito, Satoshi, Miki, Takashi, Hase, Takashi, Hamada, Mamoru, Hayashi, Seiji, Kawate, Yoshio, and Hirose, Ryoichi

Subjects
SUPERCONDUCTING magnets, LABORATORIES
Abstract

Describes the superconducting NMR magnet developed at the Tsukuba Magnet Laboratory in Japan in 1999. Manufacture of the magnet with 15-percent tin-bronze-processed (Nb,Ti)[sub 3]Sn, Tantalum-reinforced (Nb,Ti)[sub 3]Sn and NbTi conductors; Cooling of coils used with pressurized superfluid helium.

Published
2001
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17. Effects of high magnetic field on the morphology of carbon nanotubes and selective synthesis of...

Author

Yokomichi, Haruo, Sakima, Hiroyuki, Ichihara, Masaki, Sakai, Fumiko, Itoh, Kikuo, and Kishimoto, Naoki

Subjects
FULLERENES, CARBON, BIOSYNTHESIS
Abstract

Studies the effects of high magnetic field on the morphology of carbon nanotubes and selective synthesis of fullerenes. Synthesis of carbon nanotubes and fullerenes by arc discharge in a He gas atmosphere under a high magnetic field; Morphology and yield of the nanotubes.

Published
1999
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