Evidence for chiral -wave superconductivity in URuSi from the field-angle variation of its specific heat

Kittaka, Shunichiro*; Shimizu, Yusei*; Sakakibara, Toshiro*; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika; Tsutsumi, Yasumasa*; Nomoto, Takuya*; Ikeda, Hiroaki*; Machida, Kazushige*

Journal of the Physical Society of Japan, 85(3), p.033704_1 - 033704_4, 2016/03

https://doi.org/10.7566/JPSJ.85.033704

Local area distribution of fallout radionuclides from Fukushima Daiichi Nuclear Power Plant determined by autoradiography analysis

Sakamoto, Fuminori; Onuki, Toshihiko; Kozai, Naofumi; Igarashi, Shosuke*; Yamasaki, Shinya; Yoshida, Zenko; Tanaka, Shunichi*

Nihon Genshiryoku Gakkai Wabun Rombunshi, 11(1), p.1 - 7, 2012/01

https://doi.org/10.3327/taesj.J11.027

The autoradiography analyses of plants and soils collected in Fukushima showed radioactive Cs was distributed on the branch and leaves of trees that were present at the accident and that only small fraction may be transported to new branch and leaves grown after the accident. Radioactive Cs was present on the grass and rice stubble on the soils, but not in the soils beneath the grass and rice stubble, indicating that the radioactive Cs was deposited on the grass and the rice plant. In addition the ratio of the radioactive Cs penetrated into soil layer by weathering was very small for two months after the accident. These results indicate that trees and plant would be the reservoir of the fallout Cs and function for retardation of the fallout Cs migration with rain water.

The Formation of autunite (Ca(UO)(PO).HO) within the leached layer of dissolving apatite; Incorporation mechanism of uranium by apatite

Onuki, Toshihiko; Kozai, Naofumi; Samadfam, M.; Yasuda, Ryo; Yamamoto, Shunya; Narumi, Kazumasa; Naramoto, Hiroshi; Murakami, Takashi*

Chemical Geology, 211(1-2), p.1 - 14, 2004/11

https://doi.org/10.1016/j.chemgeo.2004.03.004

no abstracts in English

Effects of triple ion beams in ferritic/martensitic steel on swelling behavior

Wakai, Eiichi; Sawai, Tomotsugu; Furuya, Kazuyuki; Naito, Akira; Aruga, Takeo; Kikuchi, Kenji; Yamashita, Shinichiro*; Onuki, Somei*; Yamamoto, Shunya; Naramoto, Hiroshi; et al.

Journal of Nuclear Materials, 307-311(Part.1), p.278 - 282, 2002/12

https://doi.org/10.1016/S0022-3115(02)01076-0

no abstracts in English

Safety considerations for continuous hydrogen production test apparatus wtih capacity of 50 N-litter hydrogen per hour

Onuki, Kaoru; Akino, Norio; Shimizu, Saburo; Nakajima, Hayato; Higashi, Shunichi; Kubo, Shinji

JAERI-Tech 2001-032, 63 Pages, 2001/03

JAERI-Tech-2001-032.pdf:4.63MB

no abstracts in English

Sorption behavior of europium during alteration of albite

Onuki, Toshihiko; Kozai, Naofumi; Isobe, Hiroshi; Murakami, Takashi*; Yamamoto, Shunya; Narumi, Kazumasa; Naramoto, Hiroshi

Radiochimica Acta, 86(3-4), p.161 - 165, 1999/00

https://doi.org/10.1524/ract.1999.86.34.161

no abstracts in English

Irradiation effects on hydriding characteristics of metal hydride

Onuki, Shun*; Abe, Hiroshi; Matsumura, Yoshihito*; Uchida, Hirohisa*

no journal, , 

Hydrogen storage alloys are applied to the negative electrodes of the Ni-MH batteries. In such metal alloys high hydrogen absorption rate is required for the practical use. The electron/ion beam modifications are of effective methods to improve the hydrogen absorption rate in metal. In the present study, we have carried out the irradiation of electron beam and charged ion to La-Ni based hydrogen storage alloy. We measured the hydrogen absorption rates in irradiated/un-irradiated La-Ni based alloys. The samples used in this study were LaNiAl alloys. An electron beam or several ion irradiations used the 2 MV Cockcroft-Walton electron accelerator or the TIARA(Takasaki Ion Accelerators for Advanced Radiation Application) 400 kV ion implanter in JAEA. The hydrogen absorption rate measurements were also performed for the irradiated and un-irradiated La-Ni based alloy samples using the Severs equipment. The chemical compositions in the surface of the irradiated La-Ni bossed alloys were analyzed by scanning electron microscopy equipped with energy dispersive spectroscopy. The crystal structure and phase of the bulk into the irradiated La-Ni based alloys were determined by X-ray diffraction.

Irradiation effects on hydrogen absorption rate of metal hydride

Onuki, Shun*; Abe, Hiroshi; Matsumura, Yoshihito*; Uchida, Hirohisa*

no journal, , 

Hydrogen storage alloys are required high hydrogen absorption rate for the negative electrodes of the Ni-MH batteries applications. Surface modifications are crucial to improve the reactivity of hydrogen with metals because the dissociation of the H molecules in the gas phase or the dissociation of the HO molecules in an electrochemical process is the first step of the overall reaction of hydrogen absorption by metals. In the present study, irradiation effects on electron beam and charged ions on hydriding characteristics of LaNiAl alloy were studied. The hydrogen absorption rare measurements were also performed for the irradiated and un-irradiated samples using an electrochemical method. The crystal structure and phase of the bulk of the irradiated alloys were determined by X-ray diffraction. We will discus the effects of irradiation fo electron beam and ions on the improvement of the rate of hydrogen absorption by the LaNiAl alloys.

Functional change of the hydrogen absorption for hydrogen absorbing alloy by electron/ion irradiation effects

Abe, Hiroshi; Onuki, Shun*; Matsumura, Yoshihito*; Oshima, Takeshi

no journal, , 

no abstracts in English

Irradiation treatment effects on hydrogen storage alloy

Onuki, Shun*; Shinohara, Yoshiaki*; Sutrisna, F.*; Utsumi, Michiaki*; Uchida, Hirohisa*; Matsumura, Yoshihito*; Abe, Hiroshi

no journal, , 

The ion irradiation treatment improved the hydrogen absorption rate. The irradiation of electron beam to the LaNiAl hydrogen storage alloy surface was performed bye the dose of 1 10 e/cm, at 1 MeV and 2 MeV of acceleration energy, in vacuum at 2 Pa and atmospheric pressure in air. Electron beam irradiated sample was found to induce a higher absorption rate than that of the un-irradiated one. The maximum value of the hydrogen absorption rate was obtained in the sample irradiated by 2 MeV electron beam in the vacuum condition. X-ray Photoelectron Spectra (XPS) of the samples indicate that composition of oxide layer by electron beam irradiation. The electron beam irradiation was found as an effective way to enhance the rate of the initial activation of the hydrogen absorption of La-Ni alloy.