H
Hiroyuki Fujimoto
Researcher at National Institute of Advanced Industrial Science and Technology
Publications - 203
Citations - 3935
Hiroyuki Fujimoto is an academic researcher from National Institute of Advanced Industrial Science and Technology. The author has contributed to research in topics: Superconductivity & Magnetic field. The author has an hindex of 33, co-authored 202 publications receiving 3787 citations. Previous affiliations of Hiroyuki Fujimoto include Tokyo Medical and Dental University & Shimadzu Corp..
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Journal ArticleDOI
Flux pinning and critical currents in melt processed YBaCuO superconductors
TL;DR: In this article, the flux pinning behavior of melt processed Y2BaCuO5(211) inclusions was investigated and the mechanism for pinning due to large normal precipitates was presented.
Journal ArticleDOI
Counting the atoms in a 28Si crystal for a new kilogram definition
Birk Andreas,Yasushi Azuma,Guido Bartl,Peter Becker,Horst Bettin,Michael Borys,I. Busch,P Fuchs,Kenichi Fujii,Hiroyuki Fujimoto,Ernest G. Kessler,Michael Krumrey,Ulrich Kuetgens,Naoki Kuramoto,Giovanni Mana,Enrico Massa,Shigeki Mizushima,Arnold Nicolaus,A. Picard,Axel Pramann,Olaf Rienitz,Detlef Schiel,S. Valkiers,A. Waseda,Sabine Zakel +24 more
TL;DR: In this article, the Avogadro constant was determined by counting the atoms in an isotopically enriched silicon crystal using isotope dilution mass spectrometry (ISMS).
Journal ArticleDOI
Large Levitation Force due to Flux Pinning in YBaCuO Superconductors Fabricated by Melt-Powder-Melt-Growth Process
Masato Murakami,Terutugu Oyama,Hiroyuki Fujimoto,Takahiro Taguchi,Satoshi Gotoh,Yuh Shiohara,Naoki Koshizuka,Shoji Tanaka +7 more
TL;DR: An extremely large levitation force of as high as 30 N at a height of 1 mm was achieved in Ag-doped YBaCuO fabricated by the Melt-Powder-Melt-Growth process using a repulsive force against a 0.4 T rare-earth magnet at 77 K as discussed by the authors.
Journal ArticleDOI
Improved measurement results for the Avogadro constant using a 28Si-enriched crystal
Yasushi Azuma,Pauline Barat,Guido Bartl,Horst Bettin,Michael Borys,I. Busch,L. Cibik,Giancarlo D'Agostino,Kenichi Fujii,Hiroyuki Fujimoto,Akiharu Hioki,Michael Krumrey,Ulrich Kuetgens,Naoki Kuramoto,Giovanni Mana,Enrico Massa,Rudolf Meeß,Shigeki Mizushima,Tomohiro Narukawa,Arnold Nicolaus,Axel Pramann,Savelas A. Rabb,Olaf Rienitz,Carlo Paolo Sasso,Michael Stock,Robert D. Vocke,A Waseda,Stefan Wundrack,Sabine Zakel +28 more
TL;DR: In this paper, the Avogadro constant was determined by counting the atoms in an isotopically enriched silicon crystal, which achieved the target relative standard uncertainty of $2.0 \times 10^{-8}$ necessary for the realization of the new kilogram.
Journal ArticleDOI
Improved measurement results for the Avogadro constant using a 28Si-enriched crystal
Yasushi Azuma,Pauline Barat,Guido Bartl,Horst Bettin,Michael Borys,I. Busch,L. Cibik,Giancarlo D'Agostino,Kenichi Fujii,Hiroyuki Fujimoto,Akiharu Hioki,Michael Krumrey,Ulrich Kuetgens,Naoki Kuramoto,Giovanni Mana,Enrico Massa,Rudolf Meeß,Shigeki Mizushima,Tomohiro Narukawa,Arnold Nicolaus,Axel Pramann,Savelas A. Rabb,Olaf Rienitz,Carlo Paolo Sasso,Michael Stock,Robert D. Vocke,A Waseda,Stefan Wundrack,Sabine Zakel +28 more
TL;DR: The x-ray crystal density method has achieved the target relative standard uncertainty of 2.0 × 10−8 necessary for the realization of the definition of the new kilogram.