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Kuroda, Rikuto*; Matsumoto, Ryosuke*; Oda, Yutaka*; Fukai, Ao*; Kida, Kenta*; Iikura, Hiroshi; Kurita, Keisuke
2022-Nendo Nihon Reito Kucho Gakkai Nenji Taikai Koen Rombunshu, 6 Pages, 2022/09
Frost formation causes the thermal resistance for the heat transfer performance on the heat exchanger. In this study, the frost distribution on the heat exchanger used in the automobile air conditioning system was evaluated by neutron radiography imaging. At the initial stage of the frost formation, the frost formed in the upstream side of the heat exchanger. The frost deposited in the downstream region of the heat exchanger as time proceeds.
Takizawa, Kentaro*; Kakehashi, Kazuyuki*; Fukuda, Toshiaki*; Kida, Toru*; Sawa, Kazuhiro; Sumita, Junya; Kato, Yutai*; Snead, L. L.*
Ceramic Materials for Energy Applications; Ceramic Engineering and Science Proceedings, Vol.32, No.9, p.13 - 19, 2011/11
Fine-grained isotropic graphite shows high strength making it a promising material for the graphite component of High Temperature Gas-cooled Reactor (HTGR) and Very High Temperature Reactor (VHTR). Service life of the graphite component is determined primarily by the residual strength after neutron irradiation in the reactor core. It is expected that development of a new nuclear grade graphite possessing higher strength will contribute toward added design margins and an extension of the service life of components, which likely improve the reactor economy very significantly. Tokai Carbon Co. LTD. has started the development of nuclear grade graphite for the graphite component of VHTR. G347S and G458S grades are fine-grained isotropic graphites having high tensile strength greater than 30 MPa. It is planned to carry out the neutron irradiation tests using High Flux Isotope Reactor at Oak Ridge National Laboratory up to the neutron fluence of 30 dpa and the irradiation temperatures of 300-900C. The dimensional changes, elastic modulus, coefficient of thermal expansion, etc., will be studied. It is also planned to evaluate the non-irradiated mechanical/thermal properties and the irradiation effects in collaboration with Japan Atomic Energy Agency. This paper introduces our technical R&D plan for G347S and G458S. The initial results of the properties and the irradiation test plan are also shown.
Sugiyama, Kiyohiro*; Hirose, Yusuke*; Enoki, Kentaro*; Ikeda, Shugo*; Yamamoto, Etsuji; Tateiwa, Naoyuki; Haga, Yoshinori; Kida, Takanori*; Hagiwara, Masayuki*; Kindo, Koichi*; et al.
Journal of the Physical Society of Japan, 80(Suppl.A), p.SA104_1 - SA104_3, 2011/07
Times Cited Count:3 Percentile:26.89(Physics, Multidisciplinary)Hayashi, Kentaro*; Hasegawa, Toshihiro*; Tokida, Takeshi*; Ono, Keisuke*; Matsuda, Kazuhide*; Toyoda, Sakae*; Yano, Midori*; Sudo, Shigeto*; Wagai, Rota*; Matsushima, Miwa*; et al.
no journal, ,
National Institute for Agro-Environmental Sciences, Japan, established new Free-Air CO Enrichment (FACE) facilities for paddy rice in central Japan (Tsukuba FACE) in April, 2010. Early FACE studies were originally designed to investigate changes in plant growth, crop yield, and carbon cycle under elevated CO
and temperature. In addition to these research agenda, a three-year project at Tsukuba FACE that assesses the changes in nitrogen cycle due to climate manipulation (FACE-N) started in April, 2010. The FACE-N project has the following themes: (1) atmosphere-paddy exchange of nitrogen; (2) nitrogen-related processes in a soil-rice system; and (3) development of the sophisticated nitrogen cycling model at a plot scale and of the regional nitrogen assessment system using remote-sensing technique and geographic information system (GIS).
Ishizawa, Kenta*; Akuzawa, Tadashi*; Kida, Fukuka*; Arai, Tsuyoshi*; Watanabe, So; Sano, Yuichi; Takeuchi, Masayuki
no journal, ,
no abstracts in English