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Takahashi, Hiroaki*; Tachi, Yukio
Applied Clay Science, 168, p.211 - 222, 2019/02
Times Cited Count：12 Percentile：50.84(Chemistry, Physical)Microstructural and mass transport properties of compacted Na- and Cs-montmorillonites with different swelling properties were investigated by combining 3D microstructure analysis using nanofocus X-ray CT and diffusion measurement of HDO. The X-ray CT observations indicated that macropores in the dry state of compacted Na-montmorillonite are filled with gel phases, and the grain sizes of clay particles shifted toward smaller values through the saturation and swelling processes. By contrast, no gel phase and no decrease in the grain and pore volumes were observed for saturated Cs-montmorillonite. The geometrical factors of the macropores including tortuosity and geometric constrictivity of saturated Cs-montmorillonite determined by the X-ray CT was consistent with the corresponding values derived in the HDO diffusion test. In the case of Na-montmorillonite, the larger differences between the geometric factors evaluated by the X-ray CT and the diffusion tests can be explained by the electrostatic constrictivity factor and the additional geometrical factors in gel phase and interlayer that are smaller than the detection limit of the X-ray CT.
Ichihara, Akira; Kunieda, Satoshi; Chiba, Satoshi; Iwamoto, Osamu; Shibata, Keiichi; Nakagawa, Tsuneo; Fukahori, Tokio; Katakura, Junichi
JAERI-Data/Code 2005-004, 54 Pages, 2005/07
JAERI-Data-Code-2005-004.pdf:1.63MB
The computer code, POD, was developed to calculate angle-differential cross sections and analyzing powers for shape-elastic scattering for collisions of neutron or light ions with target nucleus. The cross sections are computed with the optical model. Angle-differential cross sections for neutron inelastic scattering can also be calculated with the distorted-wave Born approximation. The optical model potential parameters are the most essential inputs for those model computations. The cross sections and analyzing powers are obtained by using the existing local or global parameters. The parameters can also be inputted by users. In this report, the theoretical formulas, the computational methods, and the input parameters are explained. The sample inputs and outputs are also presented.
Kishimoto, Katsumi; Arigane, Kenji*
JAERI-Tech 2005-016, 83 Pages, 2005/03
JAERI-Tech-2005-016.pdf:10.52MB
Revaluation to activation activity of reactor evaluated at the notification of dismantling submitted in 1997 was carried out in JRR-2 where decommissioning was advanced now. In the revaluation, estimation accuracy on neutron streaming at various horizontal experimental tubes was improved by applying 3 dimensional model to neutron transport calculation that had been carried out by 2 dimensional model, and calculating with TORT. As the result, excessive overestimations on horizontal experimental tubes and biological shield that had greatly contributed to total activation activity in evaluation at the notification of dismantling was revised, sum of their activation activities in the revaluation decreased to 1/18(case after 1 year from the permanent shutdown of reactor) of evaluation at the notification of dismantling, and the structural materials that had large activation activity were changed. By the above, it was shown that introducing 3 dimensional model was effective in evaluation on activation activity of the research reactor that had a lot of various experimental tubes.
Meigo, Shinichiro; Noda, Fumiaki*; Fujimori, Hiroshi*; Ikeda, Yujiro
Proceedings of ICANS-XVI, Volume 3, p.967 - 976, 2003/07
In J-PARC project, spallation target is irradiated by 3 GeV proton beam of 1 MW. Due to hands on maintenance for the proton beam lines, loss of proton beam is limited less than 1 W/m. Since it is difficult to predict the phase space distribution of the proton beam, we decided that the beam line have to be larger acceptance for 324 
mrad, which is determined by the collimator located in the synchrotron. Distortion of proton beam is caused by the by the instability of angle at the extraction of 3-GeV synchrotron, miss alignment of the magnet, and un-uniformity of the magnet field. In this study, the distortion is calculated. In order to fit the conditions, the stability of extraction angles should be kept smaller than 0.2 mrad. As for the magnetic field, it is found that the uniformity should be kept better 5x10
and 2x10
for bending and quadruple magnets, respectively. It is also found the error of alignments should be limited smaller than 1.0 mm and 1.0 mrad.
Nakatani, Takeshi; Tanaka, Hitoshi*; Takao, Masaru*; Agui, Akane; Yoshigoe, Akitaka; Takeuchi, Masao*; Aoyagi, Hideki*; Okuma, Haruo*
JAERI-Tech 2003-048, 29 Pages, 2003/05
JAERI-Tech-2003-048.pdf:1.14MB
no abstracts in English
CIgarashi, Junichi; Nagao, Tatsuya*
Journal of the Physical Society of Japan, 72(5), p.1279 - 1286, 2003/05
Times Cited Count：13 Percentile：60.61(Physics, Multidisciplinary)We study the resonant X-ray scattering (RXS) spectra at the Dy L_
absorption edge in the quadrupolar ordering phase of DyBC. Analyzing the buckling of sheets of B and C atoms, we construct an effective model that the crystal field is acting on the 5d and 4f states with the principal axes different for different sublattices. Treating the 5d states as a band and the 4f states as localized states, we calculate the spectra within the dipole transition. We take account of processes that (1) the lattice distorion directly modulates the 5d states and (2) the charge anisotropy of the quadrupole ordering 4f states modulates the 5d states through the 5d-4f Coulomb interaction. The former process is found to give dominant contribution to the spectra.
Takahashi, Manabu*; Igarashi, Junichi
Physica B; Condensed Matter, 329-333(Part2), p.870 - 871, 2003/05
Times Cited Count：2 Percentile：14.73(Physics, Condensed Matter)We study the resonant X-ray scattering (RXS) spectra around the Cu K edge in KCuF on the basis of the band structure calculation combined with the LDA+U approximation. The lattice distortion is introduced as inputs of the calculation. We reproduce well the experimental spectra as a function of photon energy around the main--K--edge (MKE). The spectral structure around the MKE is independent of the magnetic order (MO) and the orbital order (OO) but strongly dependent on the magnitude of the Jahn--Teller distortion (JTD).
Takahashi, Manabu*; Usuda, Manabu; Igarashi, Junichi
Physical Review B, 67(6), p.064425_1 - 064425_7, 2003/02
Times Cited Count：21 Percentile：67.60(Materials Science, Multidisciplinary)We study the magnetic resonant X-ray scattering (RXS) spectra around the K edge of Cu in KCuF on the basis of an ab initio calculation. We use the full-potential linearlized augumented plane wave method in the LDA+U scheme, and introduce the lattice distortion as inputs of the calculation. We obtain finite intensity on magnetic superlattice spots by taking account of the spin-orbit interaction. We also calculate the RXS intensity on orbital superlattice spots. It is found that the intensity increases with increasing Jahn-Teller distortion.
-MnPt alloysHori, Tomiei*; Tsuchiya, Yoshinori; Shiraishi, H.*; Ishii, Yoshinobu; Hojo, Kiichi
Applied Physics A, 74(Suppl.1), p.S743 - S745, 2002/12
Times Cited Count：3 Percentile：15.87(Materials Science, Multidisciplinary)no abstracts in English
Ueshima, Yutaka
Dai-8-Kai Bijuarizeshon, Kanfarensu Rombunshu (CD-ROM), 12 Pages, 2002/10
The theory of special relativity found by Einstein is famous. It is one of the most important theories for our research on interactions between ultra-intense lasers and matters. The Name of the theory is well-known, although the understanding of that world is quite difficult. Therefore, we developed software to experience the special relativistic world with OPENGL Scene Graph. The software has not only normal display mode but also a projection mode of a simple virtual reality apparatus using polarizing filters. With the software, the relativistic distortion of a visual field and the Doppler effect near light speed can be expressed. It is difficult for a teacher to teach these relativistic effects with graphs and formulae. This software and simple virtual reality apparatus have already been used in the Ishikawa-e-Science2002, JAERI-Kyoto-Science Camp2002 and a lot of visitor tours in JAERI(Kizu). A lot of people were interested in these relativistic effects after the demonstration.
Nakahira, Masataka; Shibanuma, Kiyoshi; Kajiura, Soji*; Shibui, Masanao*; Koizumi, Koichi; Takeda, Nobukazu; Kakudate, Satoshi; Taguchi, Ko*; Oka, Kiyoshi; Obara, Kenjiro; et al.
JAERI-Tech 2002-029, 27 Pages, 2002/03
JAERI-Tech-2002-029.pdf:2.04MB
The ITER vacuum vessel (VV) R&D has progressed with the international collaborative efforts by the Japan, Russia and US Parties during the Engineering Design Activities (EDA). Fabrication and testing of a full-scale VV sector model and a port extension have yielded critical information on the fabrication and assembly technologies of the vacuum vessel, magnitude of welding distortions, dimensional accuracy and achievable tolerances during sector fabrication and field assembly. In particular, the dimensional tolerances of 
3 mm for VV sector fabrication and 10 mm for VV sector field assembly have been achieved and satisfied the requirements of 5 mm and 20 mm, respectively. Also, the basic feasibility of the remote welding robot has been demonstrated. This report presents detailed fabrication and assembly technologies such as welding technology applicable to the thick wall without large distortion, field joint welding technology between sectors and remote welding technology through the VV R&D project.
Hotta, Takashi; Dagotto, E.*
Physica B; Condensed Matter, 312-313(1-4), p.700 - 702, 2002/03
Times Cited Count：2 Percentile：14.16(Physics, Condensed Matter)The crucial role of the orbital degree of freedom is here discussed in order to understand the complex spin and charge structures of transition metal oxides. For manganites, it is shown that diagonal charge stripes in the ferromagnetic phase are induced by the staggered orbital ordered pattern, while for ruthenates, a novel orbital ordering is found to exist in the G-type antiferromagnetic structure, with a hole arrangement as recently observed in X-ray experiments.
Konno, Chikara
Progress in Nuclear Energy, 39(2), p.167 - 179, 2001/08
Times Cited Count：11 Percentile：61.30(Nuclear Science & Technology)no abstracts in English
Kosako, Kazuaki*; Konno, Chikara
Journal of Nuclear Science and Technology, 37(Suppl.1), p.475 - 478, 2000/03
no abstracts in English
Konno, Chikara
Mathematics and Computation, Reactor Physics and Environmental Analysis in Nuclear Applications, p.1755 - 1764, 1999/09
no abstracts in English
Nakamura, Hisashi; Hirabayashi, Takakuni; Akimoto, Jun*; Takahashi, Kenji*; Shindo, Hideaki*; Sakurai, Daihachiro*; Almansour, A.*; Okane, Toshimitsu*; Umeda, Takateru*
Proceedings Modeling of Casting & Solidification Processes 4, 1999, p.437 - 445, 1999/09
no abstracts in English
Kubozono, Yoshihiro*; Mimura, Kazue*; Takabayashi, Yasuhiro*; Maeda, Hironobu*; Kashino, Setsuo*; Emura, Shuichi*; Nishihata, Yasuo; Uruga, Tomoya*; Tanaka, Tsunehiro*; Takahashi, Masao*
Journal of Synchrotron Radiation, 6(Part3), p.564 - 566, 1999/05
The Rb K-edge XAFS spectra for the stable phase of RbC60 which is a quasi one-dimensional polymer were measured in the temperature range from 14.6 to 210 K in order to clarify the origin of the metal-insulator transition around 50 K. The distances and mean-square relative displacements between the Rb atom and the neighboring C atoms determined by XAFS exhibited no change around 50 K, implying that the metal-insulator transition originates from the SDW instablity.
Nakamura, Hisashi; Hirabayashi, Takakuni; Akimoto, Jun*; Takahashi, Kenji*; Shindo, Hideaki*; Sakurai, Daihachiro*; Almansour, A.*; Okane, Toshimitsu*; Umeda, Takateru*
Int. J.Cast Metals Res., 11(5), p.339 - 343, 1999/00
Times Cited Count：0 Percentile：0.00(Metallurgy & Metallurgical Engineering)no abstracts in English
; ; ; ; ; ; Harada, Hiro; ; Kume, Etsuo;
JAERI-Data/Code 97-051, 142 Pages, 1997/12
JAERI-Data-Code-97-051.pdf:3.91MB
no abstracts in English
Shiwaku, Hideaki
Hoshako, 10(2), p.69 - 72, 1997/04
no abstracts in English
