Zobrazeno 1 - 10
of 44
pro vyhledávání: '"Hirotomo Iwakiri"'
Publikováno v:
Nuclear Materials and Energy, Vol 31, Iss , Pp 101157- (2022)
To understand the interaction of hydrogen isotopes with VC and Cr23C6 precipitates, in reduced-activation ferritic/martensitic steel (F82H), we have performed first-principles calculations based on density functional theory. Energy calculations and e
Externí odkaz:
https://doaj.org/article/bd41463349e94bb0a7395fe33475d4ee
Autor:
Shintaro Hirayama, Koichi Sato, Daiji Kato, Hirotomo Iwakiri, Masatake Yamaguchi, Yoshiyuki Watanabe, Takashi Nozawa
Publikováno v:
Nuclear Materials and Energy, Vol 31, Iss , Pp 101179- (2022)
The hydrogen binding energy to vacancies or vacancy-carbon complexes in α-Fe under uniaxial tensile strain was calculated using the density functional theory. The solution energies of hydrogen and carbon decreased with an increase in the uniaxial te
Externí odkaz:
https://doaj.org/article/779440730fe143e79e635e5a66bad78e
Autor:
Masahira Onoue, Hiroyasu Tanigawa, Masakiyo Ohta, Yoshiyuki Watanabe, Daiji Kato, Atsushi Kinomura, Hirotomo Iwakiri, Qiu Xu, Koichi Sato, Takashi Onitsuka, Yohei Kondo, Atsushi Yabuuchi, Masahiko Hatakeyama
Publikováno v:
Materials Science Forum (Volume 1024),71-78,https://doi.org/10.4028/www.scientific.net/MSF.1024.71
The change in the positron annihilation lifetime (PAL) of vacancy clusters before and after electrolysis hydrogen charging was determined using PAL measurements in electron-irradiated F82H. The experimental change indicated 8 hydrogen atoms were trap
Autor:
Tamaki Shibayama, Teruya Tanaka, Takehiko Yokomine, Akira Kohyama, Tatsuya Hinoki, Kazumi Ozawa, Chang Ho Park, Tomitsugu Taguchi, Yasushi Yamamoto, Akira Hasegawa, Shuhei Nogami, Sosuke Kondo, Ryuta Kasada, Hirotomo Iwakiri, Masatoshi Kondo, Tomoaki Kunugi, Tatsuo Shikama, Nariaki Okubo, Hiroyasu Tanigawa, Satoshi Konishi, Joon-Soo Park, Toyohiko Yano, Bun Tsuchiya, Shinji Nagata, Takashi Nozawa, Yoshitaka Ueki
Publikováno v:
Journal of Nuclear Materials. 511:582-590
The R&D on SiC/SiC composites under the broader approach (BA) activities between Japan and the EU for fusion DEMO developed a fundamental database of mechanical (Task-1) and physical/chemical (Task-2) properties, with a primary target of the applicat
Autor:
Mitsutaka Miyamoto, Masaru Nakamichi, Jae-Hwan Kim, Taehyun Hwang, Hirotomo Iwakiri, Suguru Nakano
Publikováno v:
Journal of Nuclear Materials. 550:152936
Beryllium intermetallic compounds (beryllides) such as Be12Ti and Be12V are the most promising advanced neutron multipliers in demonstration (DEMO) power reactors because of their low swelling and high stability at high temperatures. In this work, be
Publikováno v:
Nuclear Materials and Energy, Vol 9, Iss C, Pp 233-236 (2016)
Beryllium intermetallic compounds (beryllides) are the most promising candidate materials for use as advanced neutron multipliers in future fusion reactors because of their low swelling and high stability at high temperatures. Recently, beryllium–t
Publikováno v:
International Journal of Hydrogen Energy. 41(21):8893-8899
Beryllium intermetallic compounds show a variety of excellent properties such as neutron multiplication, refractory function, hydrogen storage, and superconductivity. Be 12 M compounds (M = Ti, V, and Zr) have been investigated as neutron multipliers
Publikováno v:
Fusion Engineering and Design. 102:44-49
To investigate feasibility for application of Be17Ti2 as a neutron multiplier as well as a refractory material, single-phase Be17Ti2 intermetallic compounds were synthesized using an annealing heat treatment of the starting powder and a plasma sinter
Autor:
Daiji Kato, Hirotomo Iwakiri, Yoshiyuki Watanabe, Koichi Sato, Norihiko Murayoshi, Hiroyasu Tanigawa
Publikováno v:
Fusion Engineering and Design. 159:111788
In order to understand hydrogen behavior in the primary precipitates of F82H, hydrogen trapping state in Cr23C6 and TaC crystals has been theoretically investigated by atomistic calculation based on the density functional theory, focusing on the ener
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 303:42-45
First principles calculations were performed to evaluate the effect of stress on the diffusion process of oxygen atoms in monoclinic and tetragonal ZrO 2 . The formation and migration energies of an oxygen vacancy were obtained as a function of appli