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93 results on '"Hamada, Mamoru"'

5. 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

6. Fabrication test of YBCO coil and multi-tape conductor

Author

Hase, Takashi, Hamada, Mamoru, Hirose, Ryoichi, Nagahama, Yasuhide, Shikimachi, Koji, and Nagaya, Shigeo

Subjects
Yttrium barium copper oxides -- Electric properties, Magnetic fields -- Measurement, Electric coils -- Magnetic properties, Business, Electronics, Electronics and electrical industries
Abstract

The fabrication and properties of a testing coil composed of six pancake-coils with a YBCO coated conductor are discussed. Findings reveal that the coil generates magnetic field up to 0.65 T at 65 K in zero external magnetic field.

Published
2007

7. High field and high temperature characteristics of small test coil using CVD-YBCO tape for SMES

Author

Shikimachi, Koji, Hirano, Naoki, Nagaya, Shigeo, Matsuo, Hiroyuki, Nishijima, Gen, Awaji, Satoshi, Watanabe, Kazuo, Ishizuka, Masayuki, and Hamada, Mamoru

Subjects
Magnetic fields -- Measurement, Yttrium barium copper oxides -- Electric properties, Yttrium barium copper oxides -- Magnetic properties, Electric coils -- Magnetic properties, Business, Electronics, Electronics and electrical industries
Abstract

The article examines the high magnetic field and high temperature characteristics of YBCO coils. Results suggest that the YBCO coil has high potential in short-time over-current operations at high temperatures.

Published
2007

8. Present status of 920 MHz high-resolution NMR spectrometers

Author

Kiyoshi, Tsukasa, Ito, Yutaka, Ito, Satoshi, Hayashi, Noriaki, Matsumoto, Shinji, Wada, Hitoshi, Kikuchi, Jun, Maeda, Hideaki, Yokoyama, Shigeyuki, Hirota, Hiroshi, Ozaki, Osamu, Hamada, Mamoru, Miki, Takashi, Yoshikawa, Masatoshi, Suematsu, Hiroto, and Sato, Akio

Subjects
Superconducting magnets -- Electric properties, Superconducting magnets -- Testing, Nuclear magnetic resonance -- Installation, Technology installation instructions, Business, Electronics, Electronics and electrical industries
Abstract

The first 920 MHz high-resolution Nuclear Magnetic Resonance (NMR) magnets are installed at the Tsukuba Magnet Laboratory of the National Institute for Material Science. The signal-to-nose ratio of 0.1 percent ethylbenzene using a proton-selective probe is high as 2981.

Published
2004

9. Improved fabrication process for Nb(sub 3)Sn superconductors with Ta-Sn powder core

Author

Kato, Hiroyuki, Miyazaki, Takayoshi, Hase, Takashi, Hamada, Mamoru, and Tachikawa, Kyoji

Subjects
Superconducting magnets -- Electric properties, Superconductors -- Electric properties, Business, Electronics, Electronics and electrical industries
Abstract

A study is conducted to develop Nb3Sn superconductors made by the powder-in-tube (PIT) process for application to particular accelerator magnets, high field magnets and many other fields. The composition and the microstructure of Nb(sub 3)Sn layer in the wires with Nb and Ta sheath are examined.

Published
2004

10. 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

12. 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
Japan. National Institute for Materials Science -- Research, Superconducting magnets -- Research, Electrical equipment and supplies industry -- Research, Nuclear magnetic resonance -- Research, Electrical engineering, Business, Electronics, Electronics and electrical industries, European Organization for Nuclear Research -- Conferences, meetings and seminars
Abstract

Research involving a high-field nuclear magnetic resonance (NMR) magnet is reported. The work was accomplished at the Tsukuba Magnet Laboratory at the National Institute for Materials ScienceTsukuba, Ibaraki, Japan.

Published
2002

13. Development and operation of superconducting NMR magnet beyond 900 MHz

Author

Kiyoshi, Tsukas, 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 -- Design and construction, Business, Electronics, Electronics and electrical industries
Abstract

A superconducting NMR 900 MHz magnet was developed and its operation is described.

Published
2001

17. Design and Development of a Compact 1 GHz (23.5 T)-Class NMR Magnet With Bi-2223 Inner Coils

Author

Piao, Renzhong, primary, Miyoshi, Yasuyuki, additional, Yoshikawa, Masatoshi, additional, Saito, Kazuyoshi, additional, Hamada, Mamoru, additional, Matsumoto, Shinji, additional, Suematsu, Hiroto, additional, Mochida, Hiroki, additional, Takao, Tomoaki, additional, Suetomi, Yu, additional, Takahashi, Masato, additional, Maeda, Hideaki, additional, and Yanagisawa, Yoshinori, additional

Published
2019
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20. The measurement and control system for 920 MHz NMR magnet

Author

Miki, Takashi, Ito, Satoshi, Hamada, Mamoru, Yoshikawa, Masatoshi, Sato, Akio, Kiyoshi, Tsukasa, Wada, Hitoshi, Matsumoto, Fumiaki, Nagai, Hideo, Fukui, Shigeo, and Noguchi, Takashi

Subjects
Cryostat -- Electric properties, Nuclear magnetic resonance -- Analysis, Business, Electronics, Electronics and electrical industries
Abstract

An automated control and monitoring system is developed for a 920 MHz NMR magnet that is installed at Tsukuba Magnet Laboratory (TML) in April 2002. The cryostat is equipped with an automated control and monitoring system in order to achieve a quick energization and long-term operation with a minimum number of operators.

Published
2004

21. Superconducting joint of REBCO wires for MRI magnet

Author

Mukoyama, Shinichi, primary, Nakai, Akinobu, additional, Sakamoto, Hisaki, additional, Matsumoto, Shinji, additional, Nishijima, Gen, additional, Hamada, Mamoru, additional, Saito, Kazuyoshi, additional, and Miyoshi, Yasuyuki, additional

Published
2018
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23. Experimental Evaluation Of The Frost Formation

Author

Tashiro, Yusuke and Hamada, Mamoru

Subjects
frost.evaporator.heat pump.low-temperature.frost formation, eye diseases
Abstract

Frost formation on an evaporator causes a significant problem increasing thermal resistance, resulting in a decrease in system performance. It is important for an improvement in system performance under low-temperature to?predict the frost formation. We measured the weight and height of frost layer on a cold surface in different inlet air conditions, cold surface temperatures, inlet air velocities. We derived the frost density and demonstrated the dominant factors of the frost density.

Published
2014

29. Development of Next-generation NMR Technology using HTS Materials

Author

SUEMATSU, Hiroto, primary, TANAKA, Ryoji, additional, TAKAHASHI, Masato, additional, MAEDA, Hideaki, additional, OHSHIMA, Shigetoshi, additional, YANAGISAWA, Yoshinori, additional, NAKAGOME, Hideki, additional, HAMADA, Mamoru, additional, MATSUMOTO, Shinji, additional, and KIYOSHI, Tsukasa, additional

Published
2013
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30. Bi-2223 Innermost Coil for 1.03 GHz NMR Magnet

Author

Kiyoshi, Tsukasa, primary, Choi, Seyong, additional, Matsumoto, Shinji, additional, Zaitsu, Kyoji, additional, Hase, Takashi, additional, Miyazaki, Takayoshi, additional, Hamada, Mamoru, additional, Hosono, Masami, additional, and Maeda, Hideaki, additional

Published
2011
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35. Overview of the development of high-resolution NMR in NIMS

Author

Shimizu, Tadashi, primary, Hashi, Kenjiro, additional, Goto, Atsushi, additional, Tansyo, Masataka, additional, Kiyoshi, Tsukasa, additional, Matsumoto, Shinji, additional, Wada, Hitoshi, additional, Fujito, Teruaki, additional, Hasegawa, Ken-ichi, additional, Kirihara, Noriaki, additional, Suematsu, Hiroto, additional, Kida, Yoshiki, additional, Yoshikawa, Masatoshi, additional, Miki, Takashi, additional, Ito, Satoshi, additional, Hamada, Mamoru, additional, and Hayashi, Seiji, additional

Published
2004
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37. Development of a 930 MHz NMR Magnet

Author

YOSHIKAWA, Masatoshi, primary, KIYOSHI, Tsukasa, additional, MATSUMOTO, Shinji, additional, SATO, Akio, additional, WADA, Hitoshi, additional, ITO, Satoshi, additional, MIKI, Takashi, additional, OZAKI, Osamu, additional, MIYAZAKI, Takayoshi, additional, HAMADA, Mamoru, additional, MURAKAMI, Yukinobu, additional, HIROSE, Ryoichi, additional, and NOGUCHI, Takashi, additional

Published
2004
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38. Achievement of a 920-MHz High Resolution NMR

Author

Hashi, Kenjiro, primary, Shimizu, Tadashi, additional, Goto, Atsushi, additional, Kiyoshi, Tsukasa, additional, Matsumoto, Shinji, additional, Wada, Hitoshi, additional, Fujito, Teruaki, additional, Hasegawa, Ken-ichi, additional, Yoshikawa, Masatoshi, additional, Miki, Takashi, additional, Ito, Satoshi, additional, Hamada, Mamoru, additional, and Hayashi, Seiji, additional

Published
2002
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45. 2-(3-Pyridyl)thiazolidine-4-carboxamide Derivatives. II. Structure-Activity Relationships and Active Configuration of 2-(3-Pyridyl)thiazolidine-4-carboxamides as Platelet-Activating Factor Receptor Antagonists.

Author

SUZUKI, Takeshi, primary, NAGAOKA, Hitoshi, additional, KONDO, Yutaka, additional, TAKAHASHI, Takumi, additional, TAKEUCHI, Makoto, additional, HARA, Hiromu, additional, SAITO, Munetoshi, additional, YAMADA, Toshimitsu, additional, TOMIOKA, Kenichi, additional, HAMADA, Mamoru, additional, and MASE, Toshiyasu, additional

Published
1998
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47. REBCO Layer-Wound Coil Tests Under Electromagnetic Forces in an External Magnetic Field of up to 17.2 T.

Author

Matsumoto, Shinji, Choi, Seyong, Kiyoshi, Tsukasa, Otsuka, Akihiro, Hamada, Mamoru, Maeda, Hideaki, Yanagisawa, Yoshinori, Nakagome, Hideki, and Suematsu, Hiroto

Subjects
NUCLEAR magnetic resonance, COILS (Magnetism), HIGH-temperature superconducting filters, MAGNETIC fields, TENSILE strength, MAGNETIC superconductors, ELECTROMAGNETIC forces
Abstract

A nuclear magnetic resonance (NMR) system using a high-temperature superconducting (HTS) magnet and a probe with an HTS radio frequency coil is currently under development. The HTS NMR magnet is expected to reduce the volume occupied by the magnet and to encourage users to install higher field NMR systems. RE-Ba-Cu-O-coated (REBCO-coated) conductors offer the advantages of a higher critical current density than low-temperature superconductors in magnetic fields above 10 T as well as tolerance to high tensile stress. Both of these factors are expected to lead to a reduction in the volume of the magnet. Four REBCO layer-wound test coils were fabricated in order to investigate their properties under electromagnetic forces in an external magnetic field of up to 17. 2 T. The REBCO coils with a practical inner diameter were successfully operated under electromagnetic forces of over 200 MPa in high magnetic fields. [ABSTRACT FROM PUBLISHER]

Published
2012
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48. HTS-NMR: Present Status and Future Plan.

Author

Kiyoshi, Tsukasa, Seyong Choi, Matsumoto, Shinji, Zaitsu, Kyoji, Hase, Takashi, Miyazaki, Takayoshi, Otsuka, Akihiro, Yoshikawa, Masatoshi, Hamada, Mamoru, Hosono, Masami, Yanagisawa, Yoshinori, Nakagome, Hideki, Takahashi, Masato, Yamazaki, Toshio, and Maeda, Hideaki

Subjects
MAGNETIC fields, SUPERCONDUCTORS, NUCLEAR magnetic resonance, MAGNETIC resonance, SPECTROMETERS
Abstract

Using high-Tc superconductors (HTS) is considered to be the only solution to dramatically increase the highest fields of NMRmagnets because of their high critical fields. However, it is not easy to apply HTS to an NMR spectrometer (HTS-NMR) because a persistent-mode operation with HTS cannot satisfy the field stability of 0.01 ppm/h at present. To overcome this problem, we are now developing an HTS-NMR spectrometer in a driven-mode operation. As the first step, a layer-wound coil was fabricated with bronze-reinforced Bi-2223 conductors. Instead of the Nb3Sn coil, the Bi-2223 coil was installed as the innermost part of an existing NMR magnet. The magnet operated at a field of 11.7 T with a highly stabilized power supply. NMR measurements were carried out, and it was demonstrated that the quality of the multi-dimensional NMR spectra on the protein was equivalent to that obtained with a persistent-mode system. The next step will be to demonstrate its usefulness as a high-field NMR system. The upgrade of the 920 MHz NMR system installed at the Tsukuba Magnet Laboratory is underway. Its innermost coil is scheduled to be replaced by a Bi-2223 layer-wound coil for 2010. Its target field is 24.2 T (1.03 GHz). [ABSTRACT FROM AUTHOR]

Published
2010
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49. The Electrical and Mechanical Characterization of Metal-Reinforced Bi-2223/Ag Conductors for High Field Insert Coil.

Author

Choi, Seyong, Kiyoshi, Tsukasa, Matsumoto, Shinji, Uglietti, Davide, Zaitsu, Kyoji, Hase, Takashi, and Hamada, Mamoru

Subjects
HIGH temperature superconductors, CRITICAL currents, SUPERCONDUCTIVITY, MAGNETIC fields, STRAINS & stresses (Mechanics), MECHANICAL properties of metals
Abstract

In this study, we investigated in field properties of high-Tc superconductor (HTS) tapes electrically as well as mechanically. Metallic reinforced Bi-2223/Ag superconductor tapes were used in this work. The critical current (Ia), which is highly dependent on the magnetic field, was measured using fields applied parallel and perpendicular to the tape surface. The conductor was exposed to fields of up to 28 T at 4.2 K. In order to confirm the performance of tapes in practical NMR operation, Ic was also measured around 2 K. The conductor was wound on a large diameter bobbin and mechanical properties were then measured as the coil current was increased. Finally, we verified the conductor properties from coil Ic and maximum stress/strain of it. [ABSTRACT FROM AUTHOR]

Published
2009
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50. Nb3Sn Multi-Filamentary Superconducting Wires Prepared by Ta-Sn Powder in Tube Process.

Author

Miyazaki, Takayoshi, Kato, Hiroyuki, Zaitsu, Kyoji, Miyatake, Takayuki, Hamada, Mamoru, and Tachikawa, Kyoji

Subjects
SUPERCONDUCTIVITY, ELECTRIC currents, TANTALUM, MICROSCOPY, AURORAL electrojet, ELECTRIC wire, ELECTRICAL conductors
Abstract

Nb3Sn multi-filamentary superconducting wires prepared by Ta-Sn powder in tube (TS-PIT) process have been developed. To develop the TS-PIT wire with applicable scale, a two stage approach was examined. At the first stage, two kinds of test wires with single and 19 filaments were fabricated by using 10 kg class billets. The critical current density (Jc) of the single filament 2 wire was 167 A/mm² at 21 T and 4.2 K. Based on results of the first stage developments 50 kg class scale wire with 54 filaments was progressed in the following stage. This wire showed Jc of 136 A/mm² at 21 T, 4.2 K. Beside Jc, RRR and 0.2% yield strength were estimated. From these estimations, it was clear that the wire in the second stage has efficient applicable properties to the high field magnet. In both stage, microscopic analysis were followed for samples and found that over 50% in the sheath area reacted uniformly and the grain size was extremely fine. Through this development, TS-PIT processed multifilament Nb3Sn superconducting wire has been developed to applicable quality and scale. [ABSTRACT FROM AUTHOR]

Published
2005
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