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Journal Articles

Effect of re-oxidation rate of additive cations on corrosion rate of stainless steel in boiling nitric acid solution

Irisawa, Eriko; Yamamoto, Masahiro; Kato, Chiaki; Motooka, Takafumi; Ban, Yasutoshi

Journal of Nuclear Science and Technology, 56(4), p.337 - 344, 2019/04

 Times Cited Count:0 Percentile:100(Nuclear Science & Technology)

Journal Articles

Upgrade in catalytic activity of hydrophobic platinum catalysts by irradiation with electron beams

Iwai, Yasunori

Fusion Engineering and Design, 98-99, p.1796 - 1799, 2015/10

 Times Cited Count:4 Percentile:54.36(Nuclear Science & Technology)

Hydrophobic platinum catalysts have been widely applied in the field of nuclear fusion for the exchange reactions of hydrogen isotopes between hydrogen and vapor in the water detritiation system, and for the oxidation of tritium on the atmospheric detritiation system. Hydrophobic platinum catalysts are hardly susceptible to water mist and water vapor. Hydrophobic platinum catalysts are produced by supporting platinum directly on hydrophobic polymer beads. For the hydrophobic polymer, styrene - divinyl benzene (SDB) has been applied in Japan. It can be pointed out that the upgrade in catalytic activity of hydrophobic catalyst is expected to downsize the catalytic reactor based on a hard look at a large increase in flow rate in future. The upgrade in catalytic activity of two types of commercial Pt/SDB catalysts was found when they were irradiated with electron beams. After irradiation with electron beams, the catalytic activity was evaluated by means of overall reaction rate constant for the oxidation of tritium. The overall reaction rate constant increased as increase in dose. The constant showed the peak value in the dose between 500 to 1000 kGy. After the peak, the constant decreased as increase in dose. The overall reaction rate constant at the peak was 6 times larger than that evaluated with unirradiated. The mechanical strength of irradiated Pt/SDB kept sound until 1500 kGy. The irradiation is a promising method to the upgrading in catalytic activity of Pt/SDB catalyst.

Journal Articles

Electron-beam-induced fries rearrangement and oxidation reactions of sulfonic acid esters in crystalline state

Yuasa, Kanako; Enomoto, Kazuyuki*; Maekawa, Yasunari; Kato, Jun*; Yamashita, Takashi*; Yoshida, Masaru

Journal of Photopolymer Science and Technology, 17(1), p.21 - 28, 2004/07

 Times Cited Count:9 Percentile:66.33(Polymer Science)

The electron beam (EB)-induced reactions of arylsulfonic acid esters, phenyl p-toluenesulfonate (1a), phenyl benzenesulfonate (1b), and phenyl 1-naphthalenesulfonate (1c), were examined in the balk state. The EB irradiation of 1a afforded the Fries rearrangement products, o- and p-hydroxyphenyl p-tolylsulfones (2a and 3a), phenol (5), and the oxidation product of 2a, o,p-dihydroxyphenyl p-tolylsulfone (4a), which has not been observed in photolysis. The irradiation of 1b, which is liquid at room temperature, gave Fries products, 5, and the oxidation product, o,p-dihydroxyphenyl phenylsulfone. On the other hand, the EB-induced reaction of 1c proceeded with the lowest reactivity through crystal to crystal transformation to afford Fries products and 5, but not oxidation product. The mechanistic study reveals that oxidation product 4a generated by the oxidation reaction of ortho-Fries product 2a but not para-isomer 3a with an active oxidant, which should result from the decomposition of 1a.

Journal Articles

Actively controlled oxidation of Cu{001} with hyperthermal O$$_{2}$$ molecular beam

Okada, Michio*; Moritani, Kosuke; Goto, Seishiro*; Kasai, Toshio*; Yoshigoe, Akitaka; Teraoka, Yuden

Journal of Chemical Physics, 119(14), p.6994 - 6997, 2003/10

 Times Cited Count:40 Percentile:20.56(Chemistry, Physical)

The oxidation of Cu(001) with hyperthermal O$$_{2}$$ molecular beams was investigated using X-ray photoemission spectroscopy in conjunction with a synchrotron light source. The efficiency of oxidation is higher than that with ambient thermal O$$_{2}$$. Further oxidation under oxygen coverage larger than 0.5 ML occurs rather inefficiently even for the 2.3 eV beam irradiation. We found such slow oxidation of Cu corresponding to the initial stage of the Cu$$_{2}$$O formation can be interpreted in terms of a collision-induced-adsorption mechanism. The kinetics of the dissociative adsorption is well described using the first order kinetics in a simple Langmuir-type adsorption model.

Journal Articles

SiO mass spectrometry and Si-2p photoemission spectroscopy for the study of oxidation reaction dynamics of Si(001) surface by supersonic O$$_{2}$$ molecular beams under 1000 K

Teraoka, Yuden; Yoshigoe, Akitaka; Moritani, Kosuke

Japanese Journal of Applied Physics, Part 1, 42(7B), p.4671 - 4675, 2003/07

 Times Cited Count:4 Percentile:78.68(Physics, Applied)

The oxidation reaction mechanisms for Si(001) by O$$_{2}$$ molecules have been investigated in a surface temperature region from 860 K to 1300 K and in an incident energy region from 0.6 eV to 3.0 eV. Synchrotron Radiation photoemission spectroscopy was used for surface analysis. Si-2p photoemission spectra were measured during molecular beam irradiation so that their dependences on surface temperature and incident energy were clarified. SiO molecules, desorbed from the surface at high temperature region, were also detected by a quadrupole mass analyzer using $$^{18}$$O$$_{2}$$ molecular beams to measure SiO desorption yield depending on surface temperature and incident energy. Consequently, a reaction scheme, oxide layers formation, etching, and coexistence of both reactions, is determined by the incident energy under 1000 K.

JAEA Reports

Development of simulation code for MOX dissolution using silver-mediated electrochemical method (Contract research)

Kida, Takashi; Umeda, Miki; Sugikawa, Susumu

JAERI-Data/Code 2003-001, 29 Pages, 2003/03

JAERI-Data-Code-2003-001.pdf:6.34MB

MOX dissolution using silver-mediated electrochemical method will be employed for the preparation of plutonium nitrate solution in the criticality safety experiments in NUCEF. A simulation code for the MOX dissolution has been developed for the operating support. In this report an outline of the simulation code is proposed and a comparison with the experimental data and a parameter study on the MOX dissolution rate are described.The principle of this code is based on Zundelevich's model for PuO$$_{2}$$ dissolution using Ag$$^{2+}$$. The influence of nitrous acid on the material balance of Ag$$^{2+}$$ and the surface area of MOX powder on the basis of particle size distribution are taken into consideration in this model. A comparison with experimental data was carried out to confirm a validity of this model. It was confirmed that the behavior of MOX dissolution could adequately be simulated using the appropriate MOX dissolution rate constant. The parameters affecting the dissolution rate were studied, it was found that MOX particle size was major governing factor on the dissolution rate.

Journal Articles

Reaction dynamics of Si(001) oxidation at room temperature induced by supersonic O$$_{2}$$ molecular beams

Teraoka, Yuden; Yoshigoe, Akitaka

Hyomen Kagaku, 23(9), p.553 - 561, 2002/09

no abstracts in English

Journal Articles

${it In situ}$ analysis using high resolution synchrotron radiation photoemission spectroscopy for initial oxidation of H$$_{2}$$O pre-adsorbed Si(001) surfaces induced by supersonic O$$_{2}$$ molecular beams at room temperature

Yoshigoe, Akitaka; Teraoka, Yuden

Atomic Collision Research in Japan, No.28, p.105 - 107, 2002/00

The oxidation states up to Si$$^{4+}$$ states were formed when the translational kinetic energy of O$$_{2}$$ was 3.0 eV. The time evolustions of each Si oxidation states were in situ measured by using the high resolution photoemission spectroscopy.The translational kinetic energy of 3.0eV randomly enhanced the oxidation on Si(001) surface up to the second layer Si backbonds. It was found that the Si$$^{4+}$$ was not observed, thus the dimer Si atoms at the top layer was not surrounded by four oxygen atoms at the initial oxidation stage.

Journal Articles

Photoemission study on the surface reaction dynamics of Si(001) oxidation by supersonic O$$_{2}$$ molecular beams

Teraoka, Yuden; Yoshigoe, Akitaka

SPring-8 Research Frontiers 2000/2001, p.48 - 50, 2001/00

no abstracts in English

Journal Articles

Interlaboratory modeling for performance assessment of engineered barriers in high-level radioactive waste disposal

; *; *; *; *; *; Kimura, Hideo; Munakata, Masahiro

Nippon Genshiryoku Gakkai-Shi, 34(4), p.342 - 364, 1992/04

 Times Cited Count:2 Percentile:71.72(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Radiation Chemical Studies on the Treatment of Water

; ; ;

JAERI 1281, 36 Pages, 1982/10

JAERI-1281.pdf:0.97MB

no abstracts in English

Journal Articles

Zircaloy-UO$$_{2}$$ and -water reactions and cladding temperature estimation for rapidly-heated fuel rods under an RIA condition

; ;

Journal of Nuclear Science and Technology, 19(5), p.368 - 383, 1982/05

 Times Cited Count:9 Percentile:30.1(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Extent of Oxide Layer at the Inner Surface of Burst Cladding

; ; ; ;

JAERI-M 9475, 22 Pages, 1981/05

JAERI-M-9475.pdf:0.99MB

no abstracts in English

Journal Articles

Radiation chemical reactions in carbon dioxide-propane system, 3; Formation of oxygen containing products

Ikezoe, Yasumasa;

Bulletin of the Chemical Society of Japan, 51(4), p.1016 - 1019, 1978/04

 Times Cited Count:5

no abstracts in English

Journal Articles

Determination of enthalpy change oxidation reaction of uranium dioxide by D.T.A.

; Naito, Keiji; *

Nippon Genshiryoku Gakkai-Shi, 4(2), p.111 - 117, 1962/00

no abstracts in English

Oral presentation

Application of thermodynamics for oxidation of Fe-Cr alloy in humid environment at a high temperature

Serizawa, Hiroyuki; Osawa, Takahito; Oishi, Yuji*; Nemoto, Yoshiyuki; Kondo, Keietsu; Shohoji, Nobumitsu*; Kaji, Yoshiyuki

no journal, , 

A new reaction model for evaluating the activity of oxygen and hydrogen atoms of H$$_{2}$$O molecules is proposed. The surprisingly high value of the activity implies that the production process of volatile metal hydroxides might be reconsidered.

Oral presentation

Effects of hyperstoichiometry and adsorption of phthalic acid on oxidative dissolution of uranium oxide

Kumagai, Yuta; Fidalgo, A. B.*; Jonsson, M.*

no journal, , 

Radiation-induced oxidative dissolution of nuclear fuel is anticipated in the geological repository of spent fuel and after severe accidents, where the fuel would be in direct contact with water. Therefore, understanding of the oxidative dissolution of UO$$_{2}$$ is indispensable to estimate radioactive release. This study has addressed effects of hyperstoichiometry of UO$$_{2}$$ and adsorption of organic compounds on the process. Comparison between hyperstoichiometric UO$$_{2.3}$$ and stoichiometric UO$$_{2.0}$$ demonstrated that the reactivity of UO$$_{2.0}$$ approaches that of UO$$_{2.3}$$ by the H$$_{2}$$O$$_{2}$$ reaction. The result indicates formation of hyperstoichiometric surface layer during the oxidative dissolution. Phthalic acid, which was used as a model compound, suppressed the U dissolution by $$gamma$$-ray irradiation but had little involvement in the H$$_{2}$$O$$_{2}$$ reaction, in spite of adsorption exceeding 1 molecule/nm$$^{2}$$. The results suggest an involvement of radical intermediate derived from phthalic acid in the surface reaction.

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