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Tang, J.*; Seo, O.*; Rivera Rocabado, D. S.*; Koitaya, Takanori*; Yamamoto, Susumu*; Namba, Yusuke*; Song, C.*; Kim, J.*; Yoshigoe, Akitaka; Koyama, Michihisa*; et al.
Applied Surface Science, 587, p.152797_1 - 152797_8, 2022/06
Times Cited Count：7 Percentile：77.62(Chemistry, Physical)The hydrogen absorption and diffusion mechanisms on cube-shaped Pd nanoparticles (NPs) which are important hydrogen-storage materials were studied using X-ray photoelectron spectroscopy and DFT calculations. In the surface region, hydrogen absorption showed almost similar behavior regardless of the NPs size. It was found that the octahedral sites are more favorable than the tetrahedral sites for hydrogen occupation. We also clarified that the hydrogen atoms absorbing on the smaller-sized Pd NPs diffuse to the subsurface more actively because of the weakened Pd-H bond by the surface disordering, which plays an important role in hydrogen adsorption at a low H
pressure.
Zhao, Y.*; Suzuki, T.*; Iimori, T.*; Kim, H.-W.*; Ahn, J. R.*; Horio, Masafumi*; Sato, Yusuke*; Fukaya, Yuki; Kanai, T.*; Okazaki, K.*; et al.
Physical Review B, 105(11), p.115304_1 - 115304_8, 2022/03
Times Cited Count：1 Percentile：17.38(Materials Science, Multidisciplinary)no abstracts in English
Fukaya, Yuki; Zhao, Y.*; Kim, H.-W.*; Ahn, J.-R.*; Fukidome, Hirokazu*; Matsuda, Iwao*
Physical Review B, 104(18), p.L180202_1 - L180202_5, 2021/11
Times Cited Count：10 Percentile：69.8(Materials Science, Multidisciplinary)no abstracts in English
Suzuki, Satoshi; Enoeda, Mikio; Matsuda, Hirokazu*; Hiramatsu, Hideki*; Kuroda, Toshimasa*
Nihon Genshiryoku Gakkai Wabun Rombunshi, 6(3), p.365 - 369, 2007/09
The first wall of ITER will be fabricated by means of HIP method for the bonding of cooling tubes and a copper alloy heat sink. A ultrasonic testing (UT) is adopted as a non-destructive inspection method for the bonding interface as one of acceptance tests of the first wall components. Therefore, clarification of defect size criteria is one of critical issues for the soundness of the first wall. Thermo-mechanical behavior of an initial defect at the bonded interface of the first wall was numerically analyzed. J-integral was calculated to evaluate the propagation behavior of the interfacial defects under thermal loading. As a result, it was found that the initial defect size of 10mm 
20mm in semi-elliptic shape was unlikely to propagate. This defect size is more than ten times larger than a detection limit of present UT techniques, and it can be resulted that the UT method presently available is sufficient to detect such harmful initial defects of the ITER first wall.
Kurata, Masaki*; Ota, Hirokazu*; Inagaki, Kenta*; Shirasu, Noriko; Nomoto, Sukeharu*; Shibuta, Yasushi*; Matsuda, Tetsushi*
no journal, ,
no abstracts in English
Fukaya, Yuki; Zhao, Y.*; Kim, H.-W.*; Ahn, J.-R.*; Fukidome, Hirokazu*; Matsuda, Iwao*
no journal, ,
no abstracts in English
