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Koma, Yoshikazu; Ogino, Hideki; Sakamoto, Atsushi; Nakabayashi, Hiroki; Shibata, Atsuhiro; Nakahara, Masaumi; Washiya, Tadahiro
Proceedings of International Conference on Toward and Over the Fukushima Daiichi Accident (GLOBAL 2011) (CD-ROM), 6 Pages, 2011/12
Tonegawa, Toru*; Ikoma, Toshiyuki*; Suetsugu, Yasushi*; Igawa, Naoki; Matsushita, Yoshitaka*; Yoshioka, Tomohiko*; Hanagata, Nobutaka*; Tanaka, Junzo*
Materials Science & Engineering B, 173(1-3), p.171 - 175, 2010/10
Times Cited Count：11 Percentile：46(Materials Science, Multidisciplinary)The thermal expansion and crystal structure of A-type carbonate apatite with the monoclinic symmetry was investigated using the neutron powder diffraction at room temperature, 200, 300, 400 and 500
C. The 
-axis and 
-axis lattice parameters were 0.9568 and 0.6868 nm at room temperature, and those were linearly increased with the increase of temperature. It was found that the linear thermal expansion coefficient of -axis was 1.31
10
/C and -axis 8.0710
/C.
Tonegawa, Toru*; Ikoma, Toshiyuki*; Suetsugu, Yasushi*; Igawa, Naoki; Matsushita, Yoshitaka*; Yoshioka, Tomohiko*; Hanagata, Nobutaka*; Tanaka, Junzo*
Proceedings of 22nd International Symposium on Ceramics in Medicine (BIOCERAMICS-22), p.93 - 96, 2009/12
Hydroxyapatite is the main inorganic component of bone and tooth minerals, in which CO
ions partially substitute for OH and/or PO
ions. In this study, high purity type A carbonate apatite, Ca
(PO)
(CO)
powder completely substituted by carbonate ions were synthesized by a treatment of low crystalline hydroxyapatite powder, Ca(PO)(OH)
) in a dry CO
flow at 1000 C. The crystal structure of the sample was the monoclinic symmetry with space group of 
and the lattice parameters, = 0.9566 (1), 
= 1.9063 (2), = 0.6867 (1) nm and 
=119.84 (1), which was refined by a Rietveld method with neutron diffraction data.
Funasaka, Hideyuki; Koma, Yoshikazu; Sato, Koji; Nakajima, Yasuo; Shiotani, Hiroki; Kato, Atsushi; Higuchi, Tatsuya; Namba, Takashi
Proceedings of International Waste Management Symposium 2006 (WM '06) (CD-ROM), 13 Pages, 2006/02
Feasibility Study on commercialized FR cycle systems has been carried out by a Japanese joint team with the participation of all parties concerned in Japan since 1999. The result of the PhaseII (JFY 2001-2005) will work out until March 2006, and then the prospective of the promising concepts and the key issues for the commercialization will be summarized. In this paper, the candidate reprocessing systems studied in the Phase II are reviewed from the view point of compatibility with the reduction of environmental burden.
Asaoka, Hidehito; Machida, Yusuto; Yamamoto, Hiroyuki; Hojo, Kiichi; Saiki, Koichiro*; Koma, Atsushi*
Thin Solid Films, 433(1-2), p.140 - 143, 2003/06
Times Cited Count：2 Percentile：15.13(Materials Science, Multidisciplinary)no abstracts in English
Asaoka, Hidehito; Machida, Yusuto; Yamamoto, Hiroyuki; Hojo, Kiichi; Saiki, Koichiro*; Koma, Atsushi*
Solid State Communications, 124(7), p.239 - 242, 2002/11
Times Cited Count：7 Percentile：38.72(Physics, Condensed Matter)no abstracts in English
Morita, Yasuji; Tachimori, Shoichi; Koma, Yoshikazu*; Aoshima, Atsushi*
JAERI-Research 2002-017, 20 Pages, 2002/08
JAERI-Research-2002-017.pdf:1.32MB
The present report describes the results of a joint study between Japan Nuclear Cycle Development Institute (JNC) and Japan Atomic Energy Research Institute (JAERI) on actinide separation process from high-level liquid waste. The purpose of the joint study is to point out common subjects in process development by an overall evaluation of each actinide separation process: TRUEX/SETFICS Process studied in JNC and DIDPA Extraction Process studied in JAERI. The result of the evaluation showed that both processes have common subjects to be studied in sub-processes such as treatment step for spent solvent or DTPA waste solution and solvent washing step for recycling, although the main process is different from each other. It is necessary to develop the sub-processes and to test the whole process including the sub-processes. Two essential requirements: the cost reduction and the minimization of secondary wastes, are very important in future research and development for more rational and effective actinide separation process.
Asaoka, Hidehito; Saiki, Koichiro*; Koma, Atsushi*; Yamamoto, Hiroyuki
Physica B; Condensed Matter, 284-288, p.2101 - 2102, 2000/07
Times Cited Count：0 Percentile：0(Physics, Condensed Matter)no abstracts in English
Asaoka, Hidehito; Saiki, Koichiro*; Koma, Atsushi*; Yamamoto, Hiroyuki
Thin Solid Films, 369(1-2), p.273 - 276, 2000/07
Times Cited Count：14 Percentile：59.79(Materials Science, Multidisciplinary)no abstracts in English
Yoshii, Kenji; *; Saiki, Koichiro*; Koma, Atsushi*
Physical Review B, 52(18), p.13570 - 13575, 1995/11
Times Cited Count：26 Percentile：79.66(Materials Science, Multidisciplinary)no abstracts in English
