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Wei, D.*; Gong, W.; Tsuru, Tomohito; Lobzenko, I.; Li, X.*; Harjo, S.; Kawasaki, Takuro; Do, H.-S.*; Bae, J. W.*; Wagner, C.*; et al.
International Journal of Plasticity, 159, p.103443_1 - 103443_18, 2022/12
Times Cited Count：27 Percentile：98.49(Engineering, Mechanical)Yamanaka, Kenta*; Kuroda, Asumi*; Ito, Miyu*; Mori, Manami*; Bian, H.*; Shobu, Takahisa; Sato, Shigeo*; Chiba, Akihiko*
Additive Manufacturing, 37, p.101678_1 - 101678_12, 2021/01
Times Cited Count：23 Percentile：86.72(Engineering, Manufacturing)
-to-
martensitic transformation of biomedical Co-Cr-Mo alloys by introducing parent phase lattice defectsMori, Manami*; Yamanaka, Kenta*; Sato, Shigeo*; Tsubaki, Shinki*; Sato, Kozue*; Kumagai, Masayoshi*; Imafuku, Muneyuki*; Shobu, Takahisa; Chiba, Akihiko*
Journal of the Mechanical Behavior of Biomedical Materials, 90, p.523 - 529, 2019/02
Times Cited Count：19 Percentile：71.16(Engineering, Biomedical)Yamamoto, Masato*; Kimura, Akihiko*; Onizawa, Kunio; Yoshimoto, Kentaro*; Ogawa, Takuya*; Chiba, Atsushi*; Hirano, Takashi*; Sugihara, Takuji*; Sugiyama, Masanari*; Miura, Naoki*; et al.
Proceedings of 2012 ASME Pressure Vessels and Piping Conference (PVP 2012) (DVD-ROM), 7 Pages, 2012/07
Master curve (MC) approach for the fracture toughness evaluation is expected to be a powerful tool to assess the structural integrity of reactor pressure vessels (RPVs). In order to get sufficient number of reliable data for the MC approach from broken halves of surveillance test specimens for RPVs, the use of miniature specimens is necessary. For this purpose, a round robin test program on the miniature compact tension specimens (Mini-CT) of 4 mm thick for the MC approach of a Japanese RPV steel has been launched with the participation of academia, industries and a research institute in Japan. The program aims to verify the reliability of experimental data from Mini-CT, and to pick out further investigation items to be solved. As the first step of this program, four institutes carried out MC testing and evaluation using common test procedure and specimens. Valid reference temperature T
was successfully obtained in each institute. However, the T values showed large differences with maximum of 34
C. It was indicated on the reason of difference that there is a strong correlation between the T values and loading rate, which was selected by each institute per test standard.
Tanase, Atsushi*; Chiba, Akihiko*; Takeda, Masahiro*
JNC TJ7420 2005-014, 210 Pages, 2004/03
JNC-TJ7420-2005-014.PDF:80.52MB
no abstracts in English
Tanase, Atsushi*; Chiba, Akihiko*; Takeda, Masahiro*
JNC TJ7420 2005-025, 316 Pages, 2003/03
no abstracts in English
Sugie, Tatsuo; Hatae, Takaki; Koide, Yoshihiko; Fujita, Takaaki; Kusama, Yoshinori; Nishitani, Takeo; Isayama, Akihiko; Sato, Masayasu; Shinohara, Koji; Asakura, Nobuyuki; et al.
Fusion Science and Technology (JT-60 Special Issue), 42(2-3), p.482 - 511, 2002/09
Times Cited Count：6 Percentile：3.03(Nuclear Science & Technology)The diagnostic system of JT-60U (JT-60upgrade) is composed of about 50 individual diagnostic devices. Recently, the detailed radial profile measurements of plasma parameters have been improved, so that the internal structure of plasmas has been explored. The understanding of plasma confinement has been enhanced by density and temperature fluctuation measurements using a mm-wave reflectometer and electron cyclotron emission measurements respectively. In addition, the real-time control experiments of electron density, neutron yield, radiated power and electron temperature gradient have been carried out successfully by corresponding diagnostic devices. These measurements and the real time control contribute to improving plasma performance. Diagnostic devices for next generation fusion devices such as a CO2 laser interferometer/polarimeter and a CO2 laser collective Thomson scattering system have been developed.
Chiba, Akihiko*; Baba, Hideto*; Uegomori, Hiroaki*
JNC TJ7440 2005-062, 59 Pages, 1998/03
Investigation techniques to characterize geological disposal sites of radioactive wastes have been developed focusing mainly on disposal sites under fresh water environment. It will, however, be necessary to develop techniques applicable to characterization of disposal sites in saline water environment, where the sites have to be selected in a coastal region. This literature research has been carried out in order to collect and compile basic data relevant to the captioned subject. A number of cases that include investigations on drill holes filled or contaminated by sea water are collected from papers and articles in various scientific journals published in the period between 1977 and 1997. The collected data are so classified and arranged to extract the point of issue. Generally, the investigation under saline water environment should take account of higher concentration of ions, dissolved substances and, accordingly higher conductivity than under fresh water environment. The difference of the environment will influence investigation techniques such as drilling, geophysical logging in drill holes, on-site hydraulic and water quality testing and so forth. Corrosion of equipment should also be taken into condition. These point of issue, however, are not specifically discussed in most of literatures collected during this study and remain as subjects for further research.
Yasue, Kenichi; Niizato, Tadafumi; Chiba, Akihiko*
no journal, ,
Information about shallow subsurface geological structures, about 10m in depth, is useful for the estimation of a detailed position and an activity of fault, and discovery of concealed fault, and so on. We carried out the GPR (ground penetration radar) exploration to clarify the subsurface geological structure around the area where the Omagari-Toyotomi Fault was estimated. In addition, we carried out an interpretation of aerial photograph, topographical and geological investigations, and drawing up of detail counter maps. Study sites are Kaishin and Hokushin districts in the Horonobe Town, northern Hokkaido. We used the GPR with antennas of 25 MHz and 100 MHz frequencies on the alluvial surface and the lower river terrace surface. GPR profiles show the thickness of the alluvium and the terrace deposit, the distribution of the basement rock, and the structure in the alluvium. The results of this study show that GPR exploration is an effective tool to investigate the shallow subsurface geological structure in the area where the fault topography would be altered by periglacial phenomena and man-caused effects.
Yasue, Kenichi; Niizato, Tadafumi; Chiba, Akihiko*
no journal, ,
no abstracts in English
Oka, Kiyoshi; Nakamura, Tetsuya*; Ueda, Hirohisa*; Toriya, Tomoaki*; Tsumanuma, Koji*; Naganawa, Akihiro*; Watanabe, Shinsuke*; Ishiyama, Akihiko*; Yamashita, Hiromasa*; Chiba, Toshio*
no journal, ,
no abstracts in English
Kubo, Hirotaka; Itami, Kiyoshi; Chiba, Shinichi; Fukumoto, Masakatsu; Hamano, Takashi; Hatae, Takaki; Isayama, Akihiko; Imazawa, Ryota; Kamiya, Kensaku; Kawano, Yasunori; et al.
no journal, ,
no abstracts in English
