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MethanoperedenaceaeNishimura, Hiroki*; Kozuka, Mariko*; Fukuda, Akari*; Ishimura, Toyoho*; Amano, Yuki; Beppu, Hikari*; Miyakawa, Kazuya; Suzuki, Yohei*
Environmental Microbiology Reports (Internet), 15(3), p.197 - 205, 2023/06
Times Cited Count：0 Percentile：0(Environmental Sciences)The family Methanoperedenaceae archaea mediate anaerobic oxidation of methane (AOM). We newly developed a high-pressure laboratory incubation system and investigated groundwater from 214- and 249-m deep boreholes at Horonobe Underground Research Laboratory, Japan, where the high and low abundances of Methanoperedenaceae archaea have been revealed, respectively. We incubated the samples amended with or without amorphous Fe(III) and 
C-labelled methane at an in-situ pressure of 1.6 MPa. After three to seven-day incubation, AOM activities were not detected from the 249-m sample but from the 214-m sample. The AOM rates were 93.7
40.6 and 27.737.5 nM/day with and without Fe(III) amendment. Suspended particulates were not visible in the 249-m sample on the filter, while they were abundant and contained amorphous Fe(III) and Fe(III)-bearing phyllosilicates in the 214-m sample. This supports the in-situ activity of Fe(III)-dependent AOM in the deep subsurface borehole.
Eljamal, R.*; Maamoun, I.; Bensaida, K.*; Yilmaz, G.*; Sugihara, Yuji*; Eljamal, O.*
Renewable and Sustainable Energy Reviews, 158, p.112192_1 - 112192_13, 2022/04
Times Cited Count：16 Percentile：96.04(Green & Sustainable Science & Technology)Shimo, Michito*; Niwa, Masakazu; Miyakawa, Kazuya; Yasue, Kenichi*; Tonokura, Kenichi*; Tokunaga, Tomochika*
Fukada Chishitsu Kenkyujo Nempo, (23), p.21 - 34, 2022/00
no abstracts in English
Miyakawa, Kazuya; Shimo, Michito*; Niwa, Masakazu; Amano, Kenji; Tokunaga, Tomochika*; Tonokura, Kenichi*
Fukada Chishitsu Kenkyujo Nempo, (22), p.139 - 153, 2021/00
no abstracts in English
Miyakawa, Kazuya; Okumura, Fumiaki*
Geofluids, 2018, p.2436814_1 - 2436814_11, 2018/10
Times Cited Count：3 Percentile：25.31(Geochemistry & Geophysics)no abstracts in English
Miyakawa, Kazuya; Ishii, Eiichi; Hirota, Akinari*; Komatsu, Daisuke*; Ikeya, Kosuke*; Tsunogai, Urumu*
Applied Geochemistry, 76, p.218 - 231, 2017/01
Times Cited Count：14 Percentile：54.87(Geochemistry & Geophysics)no abstracts in English
Kobayashi, Kazuhiro; Terada, Osamu*; Miura, Hidenori*; Hayashi, Takumi; Nishi, Masataka
Fusion Science and Technology, 48(1), p.476 - 479, 2005/07
Times Cited Count：10 Percentile：56.94(Nuclear Science & Technology)To construct the ITER with high safety and acceptability, it is necessary to establish and to ensure the tritium safe handling technology. The performance of the detritiation system at the off-normal events has not been confirmed well. To obtain performance data of detritiation system at the off normal events, the detritiation experiment was performed at TPL/JAERI using a scaled detritiation system for the oxidation performance test. The detritiation system consists of two oxidation catalyst beds (473K and 773K) and a molecular sieve drying absorber. Basic performance of the detritiation system for hydrogen and methane in air was evaluated under maximum ventilation flow rate. Obtained oxidation efficiency was more than 99.99% for hydrogen in the catalyst bed of 473K and more than 99.9% for methane in the 773K one, respectively. It was confirmed that these performances were maintained even under carbon dioxide , carbon monoxide if oxygen remained in the process gas.
Yamauchi, Hiroki; Igawa, Naoki; Ishii, Yoshinobu
Proceedings of 5th International Conference on Gas Hydrates (ICGH-5), Volume 5, p.1615 - 1618, 2005/06
Inelastic neutron scattering experiments were carried out on powdered methane hydrate. In order to observe the precise spectra inelastic neutron scattering without the influence of incoherent contribution, the fully deuterated sample was used for the measurements. The relatively clear excitation peaks were observed at about 6.5 meV and 10 meV mainly corresponding to the transverse acoustic modes and exhibited only very little temperature dependence at 10 K and 100 K. On the other hand, the small shoulder found around 4 meV at 10 K showed apparent temperature dependence. The scattering intensity of this shoulder appeared to broaden and decrease at 100 K, which can be attributed to the increasing anharmonic contribution to the translational motion of the methane molecules encaged in the large cages.
Inaba, Yoshitomo; Nishihara, Tetsuo; Groethe, M. A.*; Nitta, Yoshikazu*
Nuclear Engineering and Design, 232(1), p.111 - 119, 2004/07
Times Cited Count：26 Percentile：82.98(Nuclear Science & Technology)It is important to grasp the explosion characteristics of object gases: natural gas and methane, in order to evaluate the influence of a gas explosion accident in the HTTR hydrogen production system on the reactor. Thus, we carried out explosion experiments of the object gases in semi-open space, and verified a numerical analysis code for the simulation of the explosion accident. It was confirmed that NG-air mixture or methane-air mixture in semi-open space didn't result in DDT although 10 g of C-4 explosive was used as an ignition source, and the numerical results agreed relatively with the experimental results. As a result, we could have the prospects for predicting the influence of the explosion accident on the reactor.
Ikeda, Takashi; Terakura, Kiyoyuki*
Journal of Chemical Physics, 119(13), p.6784 - 6788, 2003/10
Times Cited Count：26 Percentile：63.9(Chemistry, Physical)The structural, dynamical, and electronic properties of methane hydrate under pressure and at room temperature are investigated using the 
constant pressure molecular dynamics method. Cage structures in cubic structure I are destroyed at 4.5GPa. After the breakdown of cage structures water molecules form a channel surrounding a chain of methane molecules prominent in MH-III. In our MH-III there exists a single peak of C-D stretching mode showing blueshift in agreement with experiment. Our study supports the existence of 
[Phys. Rev. Lett. 
, 215501 (2001).]
Ohashi, Hirofumi; Inagaki, Yoshiyuki; Ogawa, Masuro; Onuki, Kaoru; Takeda, Tetsuaki; Nishihara, Tetsuo; Hayashi, Koji; Inaba, Yoshitomo; Shiozawa, Shusaku
Suiso Enerugi Shisutemu, 26(2), p.23 - 28, 2001/12
no abstracts in English
Wahyuni, S.*; Hirota, Koichi; Hakoda, Teruyuki; Arai, Hidehiko; Hashimoto, Shoji; Kawamoto, Fumio*; Mukunoki, Yasuo*
Bulletin of the Chemical Society of Japan, 73(8), p.1939 - 1943, 2000/08
Times Cited Count：2 Percentile：17.04(Chemistry, Multidisciplinary)no abstracts in English
Huang, Z.*; Ohashi, Hirofumi; Inagaki, Yoshiyuki
JAERI-Tech 2000-022, p.30 - 0, 2000/03
JAERI-Tech-2000-022.pdf:1.24MB
no abstracts in English
Baba, Yuji; Sekiguchi, Tetsuhiro
Surface Science, 433-435, p.843 - 848, 1999/00
Times Cited Count：6 Percentile：38.17(Chemistry, Physical)no abstracts in English
JAERI-Tech 98-014, 106 Pages, 1998/05
no abstracts in English
Inagaki, Yoshiyuki; Haga, Katsuhiro; ; Sekita, Kenji; *; Hino, Ryutaro
Nihon Genshiryoku Gakkai-Shi, 40(1), p.59 - 64, 1998/00
Times Cited Count：0 Percentile：0.01(Nuclear Science & Technology)no abstracts in English
*; Inagaki, Yoshiyuki; ; Sekita, Kenji; Haga, Katsuhiro; Hino, Ryutaro
JAERI-Research 97-076, 33 Pages, 1997/10
JAERI-Research-97-076.pdf:1.3MB
no abstracts in English
by core excitation around the K-edgeBaba, Yuji; Yoshii, Kenji; Sasaki, Teikichi
Photon Factory Activity Report, (13), P. 353, 1995/00
no abstracts in English
Hada, Kazuhiko
JAERI-M 93-029, 99 Pages, 1993/03
no abstracts in English
;
Radiation Physics and Chemistry, 33(6), p.567 - 572, 1989/00
no abstracts in English
