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Sano, Asami; Ito, Shoichi*; Suzumura, Akimasa*; Ueno, Yuichiro*; Yagi, Hikaru*; Inoue, Toru*; Kawazoe, Takaaki*
Koatsuryoku No Kagaku To Gijutsu, 30(2), p.85 - 94, 2020/10
Minerals and rocks exhibit various isotope compositions depending on their origins and histories. In interpreting their isotopic variations, the equilibrium isotope fractionation factor is a key because it depends on the environment parameters such as temperature. Recent studies have shown that the effect of pressure on the isotope fractionation, which was considered negligible compared to temperature, is significant under the conditions of the Earth's interior. In this article we review recent advances in experimental studies to determine the isotope fractionation of iron and hydrogen at high pressure over several GPa, discussing their issues and future perspectives.
Idomura, Yasuhiro; Nakata, Motoki; Yamada, Susumu; Machida, Masahiko; Imamura, Toshiyuki*; Watanabe, Tomohiko*; Nunami, Masanori*; Inoue, Hikaru*; Tsutsumi, Shigenobu*; Miyoshi, Ikuo*; et al.
International Journal of High Performance Computing Applications, 28(1), p.73 - 86, 2014/02
Times Cited Count：17 Percentile：76.04(Computer Science, Hardware & Architecture)Idomura, Yasuhiro; Nakata, Motoki; Yamada, Susumu; Machida, Masahiko; Imamura, Toshiyuki*; Watanabe, Tomohiko*; Nunami, Masanori*; Inoue, Hikaru*; Tsutsumi, Shigenobu*; Miyoshi, Ikuo*; et al.
Proceedings of 31st JSST Annual Conference; International Conference on Simulation Technology (JSST 2012) (USB Flash Drive), p.234 - 242, 2012/09
GdSugawara, Masahiko*; Kusakari, Hideshige*; Yoshizawa, Hirokazu*; Inoue, Hikaru*; Morikawa, Tsuneyasu*; Shizuma, Toshiyuki; Srebrny, J.*
Physical Review C, 83(6), p.064308_1 - 064308_13, 2011/06
Times Cited Count：6 Percentile：42(Physics, Nuclear)Multiple Coulomb-excitation experiments for Gd were made with a 118 MeV 
S beam and a 225 MeV 
Ni beam. The ground-state band, the 
band (
=0
), and the 
band (=2) were observed up to the 18
, 14, and 12 states, respectively, while the octupole band (=1
) was observed up to the 15
state, through the analysis of particle-- data. The intrinsic matrix elements entering the generalized intensity relations were obtained so as to reproduce the spin dependence of the 
2 matrix elements extracted from the experimental results of particle- angular correlation for the transitions within each band and between each band and the ground-state band by the least-squares search code gosia. The change of characters in the and bands is discussed as a possible cause for the variation of the 2 matrix elements in the higher-spin region.
Idomura, Yasuhiro; Nakata, Motoki; Yamada, Susumu; Machida, Masahiko; Imamura, Toshiyuki*; Watanabe, Tomohiko*; Nunami, Masanori*; Inoue, Hikaru*; Tsutsumi, Shigenobu*; Miyoshi, Ikuo*; et al.
no journal, ,
Idomura, Yasuhiro; Nakata, Motoki; Yamada, Susumu; Machida, Masahiko; Imamura, Toshiyuki*; Watanabe, Tomohiko*; Nunami, Masanori*; Inoue, Hikaru*; Tsutsumi, Shigenobu*; Miyoshi, Ikuo*; et al.
no journal, ,
Five dimensional gyrokinetic simulations are standard approaches in analyzing turbulent transport phenomena in fusion plasmas. For the purpose of analyzing fusture large devices such as the ITER, an extention of simulation capabilities, in particular, in the device size, is important, and larger computational resources are needed. However, a severe technical requirement on extreme parallelizm beyond 100k cores is required to extract computing power from present Peta-scale and future Exa-scale machines. In this work, we develop novel communication overlap techniques on finite difference plasma turbulence code GT5D, and achieve a good strong scaling up to 
200k cores with an order of magnitude higher parallel efficiency of 99.9998% on the K computer.
