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Katata, Genki*; Yamaguchi, Takashi*; Watanabe, Makoto*; Fukushima, Keitaro*; Nakayama, Masataka*; Nagano, Hirohiko*; Koarashi, Jun; Tateno, Ryunosuke*; Kubota, Tomohiro
Atmospheric Environment, 298, p.119640_1 - 119640_12, 2023/04
Times Cited Count：1 Percentile：52.84(Environmental Sciences)Nagano, Hirohiko; Nakayama, Masataka*; Katata, Genki*; Fukushima, Keitaro*; Yamaguchi, Takashi*; Watanabe, Makoto*; Kondo, Toshiaki*; Atarashi-Andoh, Mariko; Kubota, Tomohiro*; Tateno, Ryunosuke*; et al.
Soil Science and Plant Nutrition, 67(5), p.606 - 616, 2021/10
Times Cited Count：2 Percentile：18.84(Plant Sciences)We analyzed the relationships between nitrogen deposition (deposition of nitrate and ammonium ions) and soil microbial properties in a cool temperate forest surrounded by normally fertilized pasture grasslands in northern Japan. The aim of the present study was to gain the primary information on soil microbial response to moderately elevated nitrogen deposition (
10 kg N ha
y). We established three experimental plots in the forest edge adjacent to grasslands and other three plots in the forest interior at least 700 m away from the grasslands. During May to November 2018, nitrogen deposition in each plot was measured. In August 2018, litter and soil (0-5 cm depth) samples were collected from all plots to measure net nitrogen mineralization and nitrification rates as indicators of microbial activity, and microbial biomass carbon and nitrogen and various gene abundances (i.e. bacterial 16S rRNA, fungal ITS, bacterial amoA, and archaeal amoA genes) as indicators of microbial abundance and structure. Nitrogen deposition in the forest edge was 1.4-fold greater than that in the forest interior, even while the maximum deposition was 3.7 kg N ha. Nitrogen deposition was significantly correlated to the net nitrogen mineralization and nitrification rates and the 16S rRNA and bacterial amoA gene abundances. Microbial community structures were different between litter and soil samples but were similar between the forest edge and interior. Significant correlations of nitrogen deposition to the soil carbon to nitrogen ratio, and the nitrate and ammonium contents were also observed. Thus, our results show that moderately elevated nitrogen deposition in nitrogen-limited forest edges can stimulate microbial activities and abundances in soils.
Yamagishi, Isao; Nagaishi, Ryuji; Kato, Chiaki; Morita, Keisuke; Terada, Atsuhiko; Kamiji, Yu; Hino, Ryutaro; Sato, Hiroyuki; Nishihara, Kenji; Tsubata, Yasuhiro; et al.
Journal of Nuclear Science and Technology, 51(7-8), p.1044 - 1053, 2014/07
Times Cited Count：19 Percentile：81.41(Nuclear Science & Technology)For safe storage of zeolite wastes generated by treatment of radioactive saline water at the Fukushima Daiichi Nuclear Power Station, properties of the Herschelite adsorbent were studied and its adsorption vessel was evaluated for hydrogen production and corrosion. Hydrogen production depends on its water level and dissolved species because hydrogen is oxidized by radicals in water. It is possible to evaluate hydrogen production rate in Herschelite submerged in seawater or pure water by taking into account of the depth effect of the water. The reference vessel of decay heat 504 W with or without residual pure water was evaluated for the hydrogen concentration by thermal hydraulic analysis using obtained fundamental properties. Maximum hydrogen concentration was below the lower explosive limit (4 %). The steady-state corrosion potential of a stainless steel 316L increased with absorbed dose rate but its increase was repressed by the presence of Herschelite. At 750 Gy/h and 60
C which were values evaluated at the bottom of the vessel of 504 W, the localized corrosion of SUS316L contacted with Herschelite would not immediately occur under 20,000 ppm of Cl
concentration.
Kudo, Kenji; Kawatsuma, Shinji; Rindo, Hiroshi; Watabe, Kozo; Tomii, Hiroyuki; Shiraishi, Kunio; Yagi, Naoto; Fukushima, Tadashi; Zaitsu, Tomohisa
Proceedings of 14th International Conference on Nuclear Engineering (ICONE-14) (CD-ROM), 8 Pages, 2006/07
Japan Atomic Energy Research Institute (JAERI) played a leading role in basic research in the field of atomic energy research and development, while Japan Nuclear Cycle Development Institute (JNC) did a major role in FBR cycle development and high level waste disposal. Following the Government's decision in December 2001, JAERI and JNC was merged as of October 1st, 2005. The new organization, Japan Atomic Energy Agency (JAEA), is an institute for comprehensive R&D for atomic energy, and is the largest research and development institute among Governmental R&D organizations. Its missions are basic research on atomic energy, R&D for nuclear fuel cycle, decommissioning of own facilities and disposal of waste, contribution to safety and non-proliferation, etc. The JAEA owns a number of nuclear facilities: research reactors such as JRR-2 and Joyo, prototype reactors such as ATR "Fugen" and FBR "Monju", fuel cycle plants such as Uranium Enrichment Demonstration Plant at Ningyo-Toge, MOX fuel plants at Tokai, Reprocessing Plant at Tokai, and Hot Laboratories such as JRTF and FMF. As a part of preparation of the mergence, JNC and JAERI have jointly developed a comprehensive cost estimation method for decommissioning, based on decommissioning and refurbishing experiences of JAERI and JNC. This method involves more estimation parameters from typical decommissioning activities than before, so as to make it more reliable. JAERI and JNC have estimated the total cost for decommissioning by using this method, and concluded that the cost would be 600 billion yen (approx. 5 billion USD).
p diodes using transient ion beam-induced currentOshima, Takeshi; Sato, Takahiro; Oikawa, Masakazu*; Yamakawa, Takeshi; Onoda, Shinobu; Wakasa, Takeshi; Laird, J. S.; Hirao, Toshio; Kamiya, Tomihiro; Ito, Hisayoshi; et al.
Nuclear Instruments and Methods in Physics Research A, 541(1-2), p.236 - 240, 2005/04
Times Cited Count：9 Percentile：55.92(Instruments & Instrumentation)In order to develop particle detectors based on SiC semiconductor, SiC pn-diodes were irradiated with microbeam of 15MeV oxygen ions. The transient current was measured using the single ion hit transient ion beam induced current (TIBIC) system at TIARA. As the results, peak intensity of transient current induded by ion irradiation increased and falltime decreased with increasing applied bias. By the integration of transient current, the charge collection was estimated. It was found that charges generated in deeper region beyond the depletion layer can be collected by the funneling effect.
Oshima, Takeshi; Sato, Takahiro; Oikawa, Masakazu*; Yamakawa, Takeshi; Onoda, Shinobu; Wakasa, Takeshi; Laird, J. S.; Hirao, Toshio; Kamiya, Tomihiro; Ito, Hisayoshi; et al.
Proceedings of the 6th International Workshop on Radiation Effects on Semiconductor Devices for Space Application (RASEDA-6), p.177 - 180, 2004/10
no abstracts in English
Fukushima, Isao; Takeda, Seietsu; Yamazaki, Shinichi; Ishikawa, Hirohisa
JNC TN1400 2003-014, 65 Pages, 2004/02
JNC-TN1400-2003-014.pdf:47.43MB
none
; ; ; ; Ishikawa, Hirohisa; *
JNC TN1400 2002-019, 36 Pages, 2003/02
JNC-TN1400-2002-019.pdf:11.59MB
no abstracts in English
Fukushima, Masahiro; Ilgenfriz, E. -M.*; Toki, Hiroshi*
Physical Review D, 64(3), p.034503_1 - 034503_9, 2001/08
Times Cited Count：7 Percentile：39.31(Astronomy & Astrophysics)no abstracts in English
Hirata, Masaru; Ishikawa, Kazuya*; Kurosawa, Makoto; ; Hoshina, Hirofumi*
JAERI-M 92-206, 50 Pages, 1993/01
no abstracts in English
Katagiri, Masaki; Kishimoto, Maki; Ito, Hirokuni; ; Fukushima, Masao; Okawa, Hiroshi;
Nuclear Instruments and Methods in Physics Research A, 327, p.463 - 468, 1993/00
Times Cited Count：3 Percentile：43.05(Instruments & Instrumentation)no abstracts in English
Katagiri, Masaki; Kishimoto, Maki; Ito, Hirokuni; Fukushima, Masao; Okawa, Hiroshi; ; ; Tobita, Tsutomu
Journal of Nuclear Science and Technology, 29(10), p.957 - 965, 1992/10
no abstracts in English
; Uramoto, Toshimasa; Fukushima, Masao; ; ; ;
Proc. of the 3rd Asian Symp. on Research Reactor, p.285 - 292, 1991/00
no abstracts in English
-ray Irradiation on The Properties of Concrete; *; ; ; Araki, Kunio; ; ; ; *; *; et al.
JAERI-M 83-004, 38 Pages, 1983/02
no abstracts in English
; *; *; *
Japanese Journal of Applied Physics, 20(10), p.1799 - 1806, 1981/00
Times Cited Count：18 Percentile：65.55(Physics, Applied)no abstracts in English
*; *; Machida, Tadao*; Tomoda, Yoshio*; *; *; ; *; ; *; et al.
PNC TN251 75-01, 93 Pages, 1975/01
Recently, "acoustic emission(ae) analysis" calls attention as a dynamic and non-destructive material testing method. We can get information of material defects and cracks by catching acousticsignals from themselves, so it may be possible to know the propagation of latent cracks dynamically, to find the location of defects or to predict the failure. Therefore it may be said that this "acousticemission method" is one of the best methods of the inservice inspection of the primary coolant piping of liquid metal cooled fast breeder reactor(LMFBR). But for the application of this method, in addition to the fundamental tests, it is necessary to recognize AE characteristics of the piping by the experimental measurement of the AE signals in the cyclic loading test of the piping components. For this purpose, acontract of cooperative work was made between criepi who had much experience in AE measurement in the material tests and PNC who was doing cyclic fatigue test of the piping components. There it was agree
Kawatsuma, Shinji; Yagi, Naoto; Fukushima, Tadashi; Annen, Sotonori*; Sato, Hiroshi*; Murakami, Tsunekazu*; Hosaka, Katsumi*
no journal, ,
no abstracts in English
Kawatsuma, Shinji; Yagi, Naoto; Fukushima, Tadashi; Annen, Sotonori*; Sato, Hiroshi*; Murakami, Tsunekazu*; Hosaka, Katsumi*
no journal, ,
no abstracts in English
Yamagishi, Akihiko*; Yokobori, Shinichi*; Hashimoto, Hirofumi*; Yano, Hajime*; Imai, Eiichi*; Okudaira, Kyoko*; Kawai, Hideyuki*; Kobayashi, Kensei*; Tabata, Makoto*; Nakagawa, Kazumichi*; et al.
no journal, ,
no abstracts in English
Nakamura, Satoshi; Kimura, Takahiro; Ban, Yasutoshi; Matsumura, Tatsuro; Oizumi, Akito; Fukushima, Masahiro; Tsubata, Yasuhiro; Hayashi, Hirokazu
no journal, ,
no abstracts in English
