JOPSS - Search Results

Journal Articles

A Raman spectroscopy study of bicarbonate effects on UO $_{2+x}$

McGrady, J.; Kumagai, Yuta; Watanabe, Masayuki; Kirishima, Akira*; Akiyama, Daisuke*; Kimuro, Shingo; Ishidera, Takamitsu

Journal of Nuclear Science and Technology, 60(12), p.1586 - 1594, 2023/12

https://doi.org/10.1080/00223131.2023.2236104

Times Cited Count：2 Percentile：27.37(Nuclear Science & Technology)

Journal Articles

Stoichiometry between humate unit molecules and metal ions in supramolecular assembly induced by Cu $^{2+}$ and Tb $^{3+}$ measured by gel electrophoresis techniques

Nakano, Sumika*; Marumo, Kazuki*; Kazami, Rintaro*; Saito, Takumi*; Haraga, Tomoko; Tasaki-Handa, Yuiko*; Saito, Shingo*

Environmental Science & Technology, 55(22), p.15172 - 15180, 2021/11

https://doi.org/10.1021/acs.est.1c03993

Times Cited Count：7 Percentile：23.80(Engineering, Environmental)

Humic acid (HA) can strongly complex with metal ions to form a supramolecular assembly via coordination binding. However, determining the supramolecular size distribution and stoichiometry between small HA unit molecules constituting HA supramolecule and metal ions has proven to be challenging. Here, we investigated the changes in the size distributions of HAs induced by Cu $^{2+}$ and Tb $^{3+}$ ions using a unique polyacrylamide gel electrophoresis (PAGE) for the separation and quantification of HA complexes and metal ions bound, followed by UV-Vis spectroscopy and EEM-PARAFAC. It was found that the supramolecular behaviors of Cu $^{2+}$ and Tb $^{3+}$ complexes with HA collected from peat and deep groundwater (HHA) differed. Our results suggest that this supramolecular stoichiometry is related to the abundance of sulfur atoms in the elemental composition of HHA. Our results provide new insights into HA supramolecules formed via metal complexation.

Journal Articles

Release of ion-implanted Kr from (Th,U)O $_{2}$ ; Effect of matrix oxidation

Ogawa, Toru; Verrall, R. A.*; Hj.Matzke*; P.G.Lucata*

Solid State Ionics, 49, p.211 - 216, 1991/00

https://doi.org/10.1016/0167-2738(91)90088-S

Times Cited Count：5 Percentile：38.20(Chemistry, Physical)

no abstracts in English

Journal Articles

Thermodynamic study of UO $_{2}$ $_{+}$ $_{x}$ by solid state EMF technique

Nakamura, Akio; Fujino, Takeo

J. Nucl. Mater., 149(1), p.80 - 100, 1987/01

https://doi.org/10.1016/0022-3115(87)90501-0

Times Cited Count：44 Percentile：95.19(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Thermodynamic analysis on point defects of UO $_{2}$ $_{+}$ $_{x}$ at relatively small deviation from stoichiometry between 600 and 1400 $^{circ}$ C

Nakamura, Akio; Fujino, Takeo

J. Nucl. Mater., 140, p.113 - 130, 1986/09

https://doi.org/10.1016/0022-3115(86)90239-4

Times Cited Count：17 Percentile：83.26(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Measurements of O/U ratio and oxygen potential for UO $_{2}$ $_{+}$ $_{chi}$ (0≦x≦0.1)

Ugajin, Mitsuhiro

Journal of Nuclear Science and Technology, 20(3), p.228 - 236, 1983/00

https://doi.org/10.3327/jnst.20.228

Times Cited Count：22 Percentile：85.98(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Oxygen potentials of(Th,U)O $_{2}$ $_{+}$ $_{x}$ solid solutions

Ugajin, Mitsuhiro

J. Nucl. Mater., 110, p.140 - 146, 1982/00

https://doi.org/10.1016/0022-3115(82)90138-6

Times Cited Count：25 Percentile：88.90(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Stoichiometry of fully oxidized PuO $_{2}$ -NdO $_{1}$ $_{.}$ $_{5}$ and PuO $_{2}$ -YO $_{1}$ $_{.}$ $_{5}$ solid solutions

; ; ;

Journal of Nuclear Science and Technology, 19(8), p.681 - 683, 1982/00

https://doi.org/10.3327/jnst.19.681

Times Cited Count：2 Percentile：43.07(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Fission xenon release from lightly irradiated(Th,U)O $_{2}$ powders

Shiba, Koreyuki; ; Ugajin, Mitsuhiro

J. Nucl. Mater., 96(3), p.255 - 260, 1981/00

https://doi.org/10.1016/0022-3115(81)90569-9

Times Cited Count：6 Percentile：62.26(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Non-stoichiometry in uranium sesquinitride

Fujino, Takeo; Tagawa, Hiroaki

Journal of Physics and Chemistry of Solids, 34(10), p.1611 - 1626, 1973/10

https://doi.org/10.1016/S0022-3697(73)80127-1

Times Cited Count：11

no abstracts in English

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 -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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A Raman spectroscopy study of bicarbonate effects on UO $_{2+x}$

Stoichiometry between humate unit molecules and metal ions in supramolecular assembly induced by Cu $^{2+}$ and Tb $^{3+}$ measured by gel electrophoresis techniques

Release of ion-implanted Kr from (Th,U)O $_{2}$ ; Effect of matrix oxidation

Thermodynamic study of UO $_{2}$ $_{+}$ $_{x}$ by solid state EMF technique

Thermodynamic analysis on point defects of UO $_{2}$ $_{+}$ $_{x}$ at relatively small deviation from stoichiometry between 600 and 1400 $^{circ}$ C

Measurements of O/U ratio and oxygen potential for UO $_{2}$ $_{+}$ $_{chi}$ (0≦x≦0.1)

Oxygen potentials of(Th,U)O $_{2}$ $_{+}$ $_{x}$ solid solutions

Stoichiometry of fully oxidized PuO $_{2}$ -NdO $_{1}$ $_{.}$ $_{5}$ and PuO $_{2}$ -YO $_{1}$ $_{.}$ $_{5}$ solid solutions

Fission xenon release from lightly irradiated(Th,U)O $_{2}$ powders

Non-stoichiometry in uranium sesquinitride

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