YAMAMOTO Akiyasu

J-GLOBAL         Last updated: Oct 14, 2018 at 00:08
 
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Name
YAMAMOTO Akiyasu
Affiliation
Tokyo University of Agriculture and Technology
Section
The Graduate School of Engineering, Department of Applied Physics
Job title
Associate Professor

Research Areas

 
 

Awards & Honors

 
Jan 2011
Limiting factors of normal-state conductivity in superconducting MgB2: an application of mean-field theory for a site percolation problem, Collection of 100 highlights in superconductivity – Celebrating 100 years of Superconductivity, Institute of Physics(英国物理学会) Superconductor Science & Technology誌
 

Published Papers

 
Y. Setoyama, J. Shimoyama, S. Yamaki, A. Yamamoto, H. Ogino, K. Kishio, and S. Awaji
Superconductor Science & Technology   28(1) 015014   2015
A. G. Bhagurkar, A. Yamamoto, N. Hari Babu, J. H. Durrell, A. R. Dennis, and D. A. Cardwell
Superconductor Science & Technology   28(1) 015012   2015
H. Sugawara, T. Tsuneki, D. Watanabe, A. Yamamoto, M. Sakoda, and M. Naito
Superconductor Science & Technology   28(1) 015005   2015
A. A. Polyanskii, F. Kametani, D. Abraimov, A. Gurevich, A. Yamamoto, I. Pallecchi, M. Putti, C. Zhuang, T. Tan, and X. X. Xi
Physical Review B   90 214509   2014
S. Mizutani, A. Yamamoto, J. Shimoyama, H. Ogino, and K. Kishio
Superconductor Science & Technology   27 114001   2014
T. Motoki, J. Shimoyama, A. Yamamoto, H. Ogino, K. Kishio, G. Honda, and T. Nagaishi
Superconductor Science and Technology   27 095017   2014
T. Okada, H. Ogino, H. Yakita, A. Yamamoto, K. Kishio, and J. Shimoyama
Physica C   505 1   2014
Y. Hayashi, A. Yamamoto, H. Ogino, J. Shimoyama, and K. Kishio
Physica C   504 28   2014
S. J. Singh, J. Shimoyama, A. Yamamoto, H. Ogino, and K. Kishio
Physica C   504 19   2014
A. Yamamoto, A. Ishihara, M. Tomita, and K. Kishio
Applied Physics Letters   105(3) 032601   2014

Misc

 
Ashutosh G. Bhagurkar, Akiyasu Yamamoto, Anthony R. Dennis, John H. Durrell, Talal A. Aljohani, Hari B. Nadendla, David A. Cardwell
Journal of the American Ceramic Society   100 2451-2460   Jun 2017
© 2017 The Authors. Journal of the American Ceramic Society published by Wiley Periodicals, Inc. on behalf of American Ceramic Society (ACERS) The study reports phase and microstructural evolution in MgB 2 bulk superconductors fabricated by an in...
Motomune Kodama, Motomune Kodama, Takaaki Suzuki, Hideki Tanaka, Kenji Okishiro, Kazutaka Okamoto, Gen Nishijima, Akiyoshi Matsumoto, Akiyasu Yamamoto, Jun Ichi Shimoyama, Kohji Kishio
Superconductor Science and Technology   30    Mar 2017
© 2017 IOP Publishing Ltd. Owing to the relatively high critical temperature and the low manufacturing cost, MgB 2 superconducting wires are promising for liquid helium-free superconducting applications. Today, commercially available MgB 2 wires...
Motomune Kodama, Motomune Kodama, Hiroshi Kotaki, Hiroyuki Yamamoto, Tomohiro Iwane, Kazuhide Tanaka, Hideki Tanaka, Kenji Okishiro, Kazutaka Okamoto, Gen Nishijima, Akiyoshi Matsumoto, Hiroaki Kumakura, Akiyasu Yamamoto, Jun Ichi Shimoyama, Kohji Kishio
Superconductor Science and Technology   29    Sep 2016
© 2016 IOP Publishing Ltd. In powder-in-tube processed MgB 2 wires, the choice of boron powder as a starting material crucially affects their performance. In this paper, we prepared in situ MgB 2 wires from three types of boron powders in variou...
D. Gajda, A. Morawski, A. Zaleski, A. Yamamoto, T. Cetner
Applied Physics Letters   108    Apr 2016
© 2016 Author(s). In this article, a method allowing for the detection of damage in iron-based superconducting bulks and MgB 2 wires is presented. MgB 2 wires were made of in situ material with ex situ MgB 2 barrier. The iron superconductor stu...
Yusuke Shimada, Satoshi Hata, Ken Ichi Ikeda, Hideharu Nakashima, Syo Matsumura, Hiroya Tanaka, Akiyasu Yamamoto, Akiyasu Yamamoto, Jun Ichi Shimoyama, Kohji Kishio
Journal of Alloys and Compounds   656 172-180   Jan 2016
© 2015 Elsevier B.V. All rights reserved. We have performed combined high-resolution microstructural and grain orientation analyses to understand the key microstructural factors associated with high intergranular transport current in polycrystalli...

Conference Activities & Talks

 
Development of MgB2 Superconducting Bulk Permanent Magnet [Invited]
A. Yamamoto, S. Sugino, J. Shimoyama, K. Kishio, A. Ishihara, T. Akasaka, M. Tomita
2015 MRS Spring Meeting & Exhibit   2015   
Development of MgB2 superconducting bulk permanent magnet [Invited]
A. Yamamoto, S. Sugino, J. Shimoyama, K. Kishio, A. Ishihara, T. Akasaka, M. Tomita
International Conference on Superconductivity and Magnetism 2014   2014   
Microstructural transition and intergranular current transport properties of polycrystalline Ba122 bulks synthesized at varied temperature
A. Yamamoto, Y. Hayashi, S. Tsujitake, H. Ogino, J. Shimoyama, K. Kishio
International Conference on Superconductivity and Magnetism 2014   2014   
Can we realize self-assembled, strongly connected grain-boundaries in high performance MgB2 bulks and wires? [Invited]
A. Yamamoto
International Conference "Superconductivity for Energy 2014"   2014   
Development of high connectivity ex-situ MgB2 wires by self-sintering process
A. Yamamoto, S. Mizutani, T. Kuro, J. Shimoyama, H. Ogino, K. Kishio, M. Kodama, Y. Ichiki, K. Tanaka
Applied Superconductivity Conference 2014   2014   
Doping level dependence of intergranular current density in polycrystalline Co-doped and P-doped Ba122 bulks
A. Yamamoto, Y. Hayashi, S. Tsujitake, K. Matsumoto, H. Ogino, J. Shimoyama, K. Kishio
27th International Symposium on Superconductivity   2014   
Intergranular Current Transport Property of Polycrystalline Co Doped Ba122 Bulks with Improved Phase Purity
A. Yamamoto, Y. Hayashi, H. Ogino, J. Shimoyama, K. Kishio
2013 MRS Spring Meeting & Exhibit   2013   
Very high, uniform and stable field in MgB2 bulk superconducting magnet
A. Yamamoto, K. Iwase, J. Shimoyama, K. Kishio, A. Ishihara, T. Akasaka, M. Muralidhar, M. Tomita
2013 Cryogenic Engineering Conference and International Cryogenic Materials Conference   2013   
Understanding the route from solid-state reaction to fully-connected MgB2 wires [Invited]
A. Yamamoto, S. Mizutani, A. Ito, T. Kuro, J. Shimoyama, H. Ogino, K. Kishio, M. Kodama, Y. Ichiki and K. Tanaka
The 16th Japan-US Workshop Advanced Superconductors   2013   
Magnet creep in MgB2 superconducting bulk permanent magnet
A. Yamamoto, K. Iwase, K. Kishio, A. Ishihara, T. Akasaka, M. Tomita
23rd Magnet Technology Conference   2013   
MgB2 superconducting bulk for novel permanent magnet applications
A. Yamamoto, K. Iwase, J. Shimoyama, K. Kishio, A. Ishihara, T. Akasaka, M. Muralidhar, M. Tomita
23rd Magnet Technology Conference   2013   
Self-sintering assisted development of high connectivity ex-situ MgB2 wires
A. Yamamoto, S. Mizutani, A. Ito, J. Shimoyama, H. Ogino, K. Kishio, M. Kodama, K. Tanaka
11th European Conference on Applied Superconductivity   2013   
Evaluation of trapped field stability in MgB2 superconducting bulk magnet
A. Yamamoto, K. Kishio, A. Ishihara, T. Akasaka, M. Tomita
11th European Conference on Applied Superconductivity   2013   
Trapped field properties of MgB2 superconducting bulk magnet
A. Yamamoto, S. Sugino, K. Iwase, J. Shimoyama, K. Kishio, A. Ishihara, T. Akasaka, M. Tomita
26th International Symposium on Superconductivity   2013   
Intergranular current transport properties of Ba122 polycrystalline bulks
A. Yamamoto, Y. Hayashi, H. Ogino, J. Shimoyama, K. Kishio
International Workshop on Novel Superconductors and Super Materials 2013   2013   
Development of large size MgB2 bulk magnet
A. Yamamoto, A. Ishihara, M. Tomita, J. Shimoyama, K. Kishio
2012 MRS Spring Meeting & Exhibit   2012   
Spatial Homogeneity of Superconducting Properties in MgB2 Bulk Magnets
A. Yamamoto, T. Hirota, J. Shimoyama, K. Kishio, A. Ishihara, M. Tomita,
24th International Cryogenic Engineering Conference-International Cryogenic Materials Conference 2012   2012   
Improved connectivity and critical current density of ex-situ MgB2 bulks by solid-state self-sintering
A. Yamamoto, H. Tanaka, A. Ito, J. Shimoyama, H. Ogino, K. Kishio
24th International Cryogenic Engineering Conference-International Cryogenic Materials Conference 2012   2012   
Development of high critical current density MgB2 conductors by pressure-less densification
A. Yamamoto, H. Tanaka, A. Ito, J. Shimoyama, H. Ogino, K. Kishio
Materials&Mechanisms of Superconductivity Conference 2012   2012   
Understanding The Routes to Superior Intergrain Connectivity and Critical Current Density in MgB2 Superconductor [Invited]
A. Yamamoto, A. Ito, H. Tanaka, J. Shimoyama, H. Ogino, K. Kishio
International Union of Materials Societies Int'l Conf. on Electronic Materials   2012   

Research Grants & Projects

 
Evaluation of grain-boundaries and critical current properties in MgB2 superconductors
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(研究活動スタート支援)
Project Year: 2010 - 2011    Investigator(s): Akiyasu YAMAMOTO