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Journal Articles

A Proposed method to discriminate a gas derived from deep underground by focusing on the relationship between changes in methane and carbon dioxide concentrations in the atmosphere

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

Journal Articles

Improvements in drill-core headspace gas analysis for samples from microbially active depths

Miyakawa, Kazuya; Okumura, Fumiaki*

Geofluids, 2018, p.2436814_1 - 2436814_11, 2018/10

 Times Cited Count:1 Percentile:12.62(Geochemistry & Geophysics)

no abstracts in English

Journal Articles

The Role of low-temperature organic matter diagenesis in carbonate precipitation within a marine deposit

Miyakawa, Kazuya; Ishii, Eiichi; Hirota, Akinari*; Komatsu, Daisuke*; Ikeya, Kosuke*; Tsunogai, Urumu*

Applied Geochemistry, 76, p.218 - 231, 2017/01

 Times Cited Count:10 Percentile:51.41(Geochemistry & Geophysics)

no abstracts in English

Journal Articles

The Oxidation performance test of detritiation system under existence of CO and CO$$_{2}$$

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:58.29(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.

Journal Articles

Lattice dynamics of methane hydrate

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.

Journal Articles

Study on explosion characteristics of natural gas and methane in semi-open space for the HTTR hydrogen production system

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:84.1(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.

Journal Articles

Structural transformation of methane hydrate from cage clathrate to filled ice

Ikeda, Takashi; Terakura, Kiyoyuki*

Journal of Chemical Physics, 119(13), p.6784 - 6788, 2003/10

 Times Cited Count:24 Percentile:62.19(Chemistry, Physical)

The structural, dynamical, and electronic properties of methane hydrate under pressure and at room temperature are investigated using the $textit{ab initio}$ 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 $textquotedblleft filled icetextquotedblright proposed by Loveday textit{et al.}$ [Phys. Rev. Lett. $textbf{87}$, 215501 (2001).]

Journal Articles

Hydrogen production from methane using nuclear energy

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

Journal Articles

Enhanced decomposition of dichloromethane in air by multi-pass electron beam irradiation

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:17.11(Chemistry, Multidisciplinary)

no abstracts in English

JAEA Reports

Thermal and chemical analysis of carbon dioxide reforming of methane using the out-of-pile test facility

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

Journal Articles

Screening effect of metal,semiconductor and insulator surfaces on photo-fragmentation of physisorbed molecules

Baba, Yuji; Sekiguchi, Tetsuhiro

Surface Science, 433-435, p.843 - 848, 1999/00

 Times Cited Count:6 Percentile:38.65(Chemistry, Physical)

no abstracts in English

Journal Articles

Development of methane conversion improvement method by recycling of residual Methane for steam reforming as a part of R&D of HTGR-hydrogen production system

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

JAEA Reports

Study on methane separation from steam reforming product gas with polyimide membrane

*; 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

Journal Articles

Desorption of atomic and molecular fragment ions from solid CCl$$_{4}$$ by core excitation around the K-edge

Baba, Yuji; Yoshii, Kenji; Sasaki, Teikichi

Photon Factory Activity Report, (13), P. 353, 1995/00

no abstracts in English

JAEA Reports

Thermal property correlation package of hydrogen, carbon monoxide, carbon dioxide and methane

Hada, Kazuhiko

JAERI-M 93-029, 99 Pages, 1993/03

JAERI-M-93-029.pdf:2.39MB

no abstracts in English

Journal Articles

Effects of water vapor on the radiolysis of methane over molecular sieve 5A

;

Radiation Physics and Chemistry, 33(6), p.567 - 572, 1989/00

no abstracts in English

Journal Articles

Laboratory scale demonstration of CIS process

Shimizu, Saburo; ; Nakajima, Hayato; Ikezoe, Yasumasa;

Int.J.Hydrogen Energy, 12(10), p.687 - 691, 1987/10

 Times Cited Count:2 Percentile:47.1(Chemistry, Physical)

no abstracts in English

Journal Articles

Study of catalytic reduction of methanol for methane-methanol thermochemical hydrogen production cycles

; Shimizu, Saburo; Nakajima, Hayato; Ikezoe, Yasumasa;

Int.J.Hydrogen Energy, 12(8), p.555 - 559, 1987/08

 Times Cited Count:4 Percentile:58.79(Chemistry, Physical)

no abstracts in English

Journal Articles

Carbon coating by glow discharge

Abe, Tetsuya; Hiroki, Seiji; Murakami, Yoshio; Kato, Yoshinao*

Shinku, 30(5), p.382 - 386, 1987/05

no abstracts in English

49 (Records 1-20 displayed on this page)