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Nagao, Seiya*; Aoyama, Masakazu*; Watanabe, Akira*; Tanaka, Tadao
Colloids and Surfaces A; Physicochemical and Engineering Aspects, 347(1-3), p.239 - 244, 2009/09
Times Cited Count：6 Percentile：14.14(Chemistry, Physical)Humic substances play important role in geochemical behavior of trace elements such as actinides in aquatic environments. The association properties of Am with humic substances were studied on the basis of structural feature of humic substances. Humic acids prepared from three types of soils, and separated two humic acids with different structural features: fluorescence-poor and higher molecular size fraction, HA and fluorescence-rich and lower molecular size fraction, FL. The association experiments were carried out in a medium of 0.01M NaClO
solution at a humus concentration of 10 mg/l and pH 6-8. The dominant size fractions of Am in the presence of the HA were 450nm - 100k Daltons and 100k - 30k Daltons. On the other hand, Am was presented in the size of 30k - 10k Daltons in the FL. These results indicate that characteristics of size-fractionated humic acids are related association properties with Am.
Kobayashi, Akira*; Yamamoto, Kiyohito*; Aoyama, Shigeyasu*; Chijimatsu, Masakazu*; Fujita, Tomoo
Proceedings of 2nd International Conference on Coupled T-H-M-C Processes in Geo-systems; Fundamentals, Modeling, Experiments and Applications (GeoProc 2006), p.281 - 286, 2006/05
To investigate the effect of the chemical degradation on the mechanical behavior, the rock samples preserved in the 10 % salt water and distilled water for 90 days are subjected to the unconfined compression test. The rock samples were obtained from 
sp
HRL in Sweden. The damage parameters were identified from the unconfined compression tests for two types of rock samples. Beforehand, the characteristics of the effect of each damage parameter on the mechanical behavior were investigated by numerical simulation. By investigating the change in the damage parameters of the chemically degraded rock, the effect of the chemical degradation was tried to infer through the results of parametric study. Moreover, the 3-D finite element simulation was carried out to examine the effect of change in the damage parameters due to chemical effect in detail.
Izawa, Kazuhiko; Seki, Masakazu; Hirose, Hideyuki; Kaminaga, Jota; Aoyama, Yasuo; Yoshida, Hiroshi; Sono, Hiroki; Ogawa, Kazuhiko; Sakuraba, Koichi
UTNL-R-0453, p.9_1 - 9_10, 2006/03
no abstracts in English
Takai, Masakazu; Aoyama, Makoto; Nakazawa, Osamu; Suto, Osamu
Proceedings of 11th International IUPAC Conference on High Temperature Materials Chemistry (HTMC-11), P. 215, 2003/00
None
Nagao, Seiya; Aoyama, Masakazu*; Watanabe, Akira*; Nakaguchi, Yuzuru*; Ogawa, Hiromichi
Analytical Sciences (CD-ROM), 17(Suppl.), p.1585 - 1588, 2002/03
no abstracts in English
Aoyama, Yasuo; Komuro, Michiyasu; Seki, Masakazu; Izawa, Kazuhiko; Sono, Hiroki; Ogawa, Kazuhiko; Yanagisawa, Hiroshi; Miyoshi, Yoshinori
no journal, ,
no abstracts in English
ray analysis softwares using reference spectraAoyama, Michio*; Akiyama, Masakazu*; Asai, Masato; Abe, Takaaki*; Sato, Yasushi*; Takano, Naoto*; Takamiya, Koichi*; Hamajima, Yasunori*; Muto, Giichi*; Yamada, Takashi*; et al.
no journal, ,
Performance of -ray spectrum analysis softwares is significantly important because it directly affects the results of nuclide identification and radioactivity measurement. The Expert Committee on Next-generation Gamma-ray Spectrometry, Science and Engineering Committee, Japan Radioisotope Association, performed intercomparison of -ray analysis software by analyzing the same reference spectra with several softwares used in Japan, to know and to improve their performance. It was found that the number of peaks detected by the peak search analysis and deduced peak areas were different among each of the softwares. The reasons why such differences occur are investigated in detail.
