Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Ge studied by soft X-ray angle-resolved photoemission spectroscopyYasui, Akira; Fujimori, Shinichi; Kawasaki, Ikuto; Okane, Tetsuo; Takeda, Yukiharu; Saito, Yuji; Yamagami, Hiroshi; Sekiyama, Akira*; Settai, Rikio*; Matsuda, Tatsuma; et al.
Physical Review B, 84(19), p.195121_1 - 195121_6, 2011/11
Times Cited Count：7 Percentile：32.89(Materials Science, Multidisciplinary)We have measured three-dimensional band structure and Fermi surfaces (FSs) of YbCuGe, which has recently become recognized as a nearly divalent Yb-based compound, by using soft X-ray angle-resolved photoemission spectroscopy. We clarified that the bands with finite Yb 4
contribution cross the Fermi level and are slightly involved in the formation of the FSs, in line with the valence-fluctuating state of YbCuGe. The obtained valence-band dispersions and the FSs are well explained by a relativistic band-structure calculation based on a local-density-approximation (LDA). These results suggest that the LDA calculation is a good starting point for understanding of the electronic state of YbCuGe as well as nearly divalent Yb-based compounds.
form on the basis of the 2-dimensional wide-angle synchrotron X-ray and neutron diffraction measurementsWasanasuk, K.*; Tashiro, Koji*; Hanesaka, Makoto*; Ohara, Takashi*; Kurihara, Kazuo; Kuroki, Ryota; Tamada, Taro; Ozeki, Tomoji*; Kanamoto, Tetsuo*
Macromolecules, 44(16), p.6441 - 6452, 2011/07
Times Cited Count：186 Percentile：98.62(Polymer Science)The crystal structure of poly(L-lactic acid) (PLLA) 
form has been analyzed in detail by utilizing the 2-dimensional wideangle X-ray (WAXD) and neutron diffraction (WAND) data measured for the ultradrawn sample. The WAXD data were collected using a synchrotron-sourced high-energy X-ray beam of wavelength 0.328
at SPring-8 and the WAND data were measured using a neutron beam of wavelength 1.510 with a BIX-3 detector at JRR-3, JAEA. The initial crystal structure model was extracted successfully by a direct method under the assumption of the space group 
2
22 using about 700 X-ray reflections observed at -150
C. The crystal structure model obtained by the direct method was refined so that the best agreement between the observed and calculated integrated intensities was obtained or the reliability factor (
) became minimal: was 18.2% at -150C and 23.2% at 25C. The obtained chain conformation took the distorted (10/3) helical form with 2 helical symmetry along the chain axis. However, the symmetrically forbidden reflections were detected in a series of the 00l reflections, requiring us to erase the 2 screw symmetry along the molecular chain. By assuming the space group symmetry 2, the structural refinement was made furthermore and the finally obtained R factor was 19.3% at -150C and 19.4% at 25C. This refined model was found to reproduce the observed reflection profiles well for all the layer lines. The X-ray-analyzed crystal structure was transferred to the WAND data analysis to determine the hydrogen atomic positions. The factor was 23.0% for the 92 observed reflections at 25C. The agreement between the observed and calculated layer line profiles was good.
GeYasui, Akira; Fujimori, Shinichi; Kawasaki, Ikuto; Okane, Tetsuo; Takeda, Yukiharu; Saito, Yuji; Yamagami, Hiroshi; Sekiyama, Akira*; Settai, Rikio*; Matsuda, Tatsuma; et al.
Journal of Physics; Conference Series, 273, p.012067_1 - 012067_4, 2011/02
Times Cited Count：3 Percentile：62.76(Physics, Condensed Matter)Soft X-ray photoemission spectroscopies have been performed on YbCuGe, which is thought to be a Yb divalent system, to investigate its bulk electronic structure including Yb 4 electrons. Small but finite Yb
multiplet peaks were found at 6
12 eV in the angle-integrated spectrum, suggesting that it is a valence fluctuation compound. An "anti-crossing" Yb 4 bands with conduction bands were observed in the angle-resolved spectrum. This is the evidence that the Yb 4 electrons form a band state through the hybridization with Ge 4
and Cu 3
electrons.
Tochio, Daisuke; Hamamoto, Shimpei; Inoi, Hiroyuki; Shimazaki, Yosuke; Sekita, Kenji; Kondo, Masaaki; Saikusa, Akio; Kameyama, Yasuhiko; Saito, Kenji; Emori, Koichi; et al.
JAEA-Technology 2010-038, 57 Pages, 2010/12
JAEA-Technology-2010-038.pdf:2.36MB
In HTTR, in-service operation is conducted through the rise-to power operation with rated operation or high-temperature test operation from achievement of first criticality at 1998. To make practical use HTGR system, it must be demonstrated to supply stable heat to heat utilization system for long-term. In HTTR, high-temperature/parallel-loaded long-term operation had been performed from January 2010. As the result, it was demonstrated to supply stable heat to heat utilization system for 50 days with HTTR, moreover, various long-term operation data were gained. This paper reports the characteristics of the high-temperature long-term operation for HTTR obtained from the operation.
O
thin films exhibiting photoinduced magnetizationKobayashi, Masaki*; Oki, Yasuhiro*; Takizawa, Masaru*; Song, G. S.*; Fujimori, Atsushi; Takeda, Yukiharu; Terai, Kota*; Okane, Tetsuo; Fujimori, Shinichi; Saito, Yuji; et al.
Applied Physics Letters, 92(8), p.082502_1 - 082502_3, 2008/02
Times Cited Count：12 Percentile：44.62(Physics, Applied)Motojima, Osamu*; Yamada, Hiroshi*; Komori, Akio*; Oyabu, Nobuyoshi*; Muto, Takashi*; Kaneko, Osamu*; Kawahata, Kazuo*; Mito, Toshiyuki*; Ida, Katsumi*; Imagawa, Shinsaku*; et al.
Nuclear Fusion, 47(10), p.S668 - S676, 2007/10
Times Cited Count：34 Percentile：73.71(Physics, Fluids & Plasmas)The performance of net-current free heliotron plasmas has been developed by findings of innovative operational scenarios in conjunction with an upgrade of the heating power and the pumping/fuelling capability in the Large Helical Device (LHD). Consequently, the operational regime has been extended, in particular, with regard to high density, long pulse length and high beta. Diversified studies in LHD have elucidated the advantages of net-current free heliotron plasmas. In particular, an internal diffusion barrier (IDB) by a combination of efficient pumping of the local island divertor function and core fuelling by pellet injection has realized a super dense core as high as 5
10
m
, which stimulates an attractive super dense core reactor. Achievements of a volume averaged beta of 4.5% and a discharge duration of 54 min with a total input energy of 1.6 GJ (490 kW on average) are also highlighted. The progress of LHD experiments in these two years is overviewed by highlighting IDB, high-beta and long pulse.
Motojima, Osamu*; Yamada, Hiroshi*; Komori, Akio*; Oyabu, Nobuyoshi*; Kaneko, Osamu*; Kawahata, Kazuo*; Mito, Toshiyuki*; Muto, Takashi*; Ida, Katsumi*; Imagawa, Shinsaku*; et al.
Proceedings of 21st IAEA Fusion Energy Conference (FEC 2006) (CD-ROM), 12 Pages, 2007/03
The performance of net-current free Heliotron plasmas has been developed by findings of innovative operational scenarios in conjunction with an upgrade of the heating power and the pumping/fueling capability in the Large Helical Device (LHD). Consequently, the operational regime has been extended, in particular, with regard to high density, long pulse length and high beta. Diversified studies in LHD have elucidated the advantages of net-current free heliotron plasmas. In particular, an Internal Diffusion Barrier (IDB) by combination of efficient pumping of the local island divertor function and core fueling by pellet injection has realized a super dense core as high as 510m, which stimulates an attractive super dense core reactor. Achievements of a volume averaged beta of 4.5 % and a discharge duration of 54-min. with a total input energy of 1.6 GJ (490 kW in average) are also highlighted. The progress of LHD experiments in these two years is overviewed with highlighting IDB, high 
and long pulse.
*; Owada, Hitoshi*; Fujita, Hideki*; *; *; Yokozeki, Kosuke*; *
JNC TJ8400 2002-029, 79 Pages, 2002/02
JNC-TJ8400-2002-029.pdf:1.58MB
We acquired the water permeation properties and also mechanical characteristics of the altered specimen that produced by permeation or leaching as the fundamental data for the evaluation in "Study on the system development for evaluating long-term alteration of hydraulic field in Near Field" that had been carried out separately. The results in this year are shown below. (1)Hardened cement paste specimens with W/C=85% and 105% were altered and characterized after permeation. Permeability of altered part was increased, as permeated water increased. Porosity was increased at the upper part of altered specimens, and compressive strength that means the properties from altered part of specimens were decreased after water-permeation. Adequate correlations are estimated between compressive strength and porosity, permeability, Vickers hardness. From the chemical properties, it is presumed these physical changes were caused by dissolution of portlandite. (2)Hardened cement paste specimens with W/C=40 to 105% were immersed into deionized water and alteration behavior under diffusion condition was investigated. As a result, after 12 weeks, porosity was increasing and Vickers hardness was decreasing at the altered area. And the water permeability and the compressive strength at the deteriorated area were simulated from relations between water permeability, compressive strength, porosity, Vickers hardness and leaching ratio of calcium. These results suggest that two methods (permeation and leaching) make up for fault of each other. It is necessary to prepare additional data, to clarify the relations between each alteration factor.
*; Owada, Hitoshi*; Fujita, Hideki*; *; *; Yokozeki, Kosuke*; *
JNC TJ8400 2002-028, 218 Pages, 2002/02
We acquired the water permeation properties and also mechanical characteristics of the altered specimen that produced by permeation or leaching as the fundamental data for the evaluation in "Study on the system development for evaluating long-term alteration of hydraulic field in Near Field" that had been carried out separately. The results in this year are shown below. (1)Hardened cement paste specimens with W/C=85% and 105% were altered and characterized after permeation. Permeability of altered part was increased, as permeated water increased. Porosity was increased at the upper part of altered specimens, and compressive strength that means the properties from altered part of specimens were decreased after water-permeation. Adequate correlations are estimated between compressive strength and porosity, permeability, Vickers hardness. From the chemical properties, it is presumed these physical changes were caused by dissolution of portlandite. (2)Hardened cement paste specimens with W/C=40 to 105% were immersed into deionized water and alteration behavior under diffusion condition was investigated. As a result, after 12 weeks, porosity was increasing and Vickers hardness was decreasing at the altered area. And the water permeability and the compressive strength at the deteriorated area were simulated from relations between water permeability, compressive strength, porosity, Vickers hardness and leaching ratio of calcium. These results suggest that two methods (permeation and leaching) make up for fault of each other. It is necessary to prepare additional data, to clarify the relations between each alteration factor.
ions in the region of the 1
2
autoionizing resonanceOura, Masaki*; Yamaoka, Hitoshi*; Kawatsura, Kiyoshi*; Kimata, Junichi*; Hayaishi, T.*; Takahashi, Takehisa*; Koizumi, Tetsuo*; Sekioka, T.*; Terasawa, Michitaka*; Ito, Yo*; et al.
Physical Review A, 63(1), p.014704_1 - 014704_4, 2001/01
Times Cited Count：15 Percentile：59.79(Optics)no abstracts in English
Al
, studied by resonant and X-ray photoelectron spectroscopyFujimori, Shinichi; *; *; *; *; *; *; Okane, Tetsuo; *; *; et al.
Journal of Electron Spectroscopy and Related Phenomena, 101-103, p.439 - 442, 1999/00
Times Cited Count：4 Percentile：22.57(Spectroscopy)no abstracts in English
Yokoya, Akinari; Sekiguchi, Tetsuhiro; Saito, Yuji; Okane, Tetsuo*; Nakatani, Takeshi; Shimada, Taihei; Kobayashi, Hideki*; Takao, Masaru*; Teraoka, Yuden; Hayashi, Yukio; et al.
Journal of Synchrotron Radiation, 5, p.10 - 16, 1998/00
Times Cited Count：87 Percentile：96.77(Instruments & Instrumentation)no abstracts in English
Haga, Katsuhiro; Hino, Ryutaro; Inagaki, Yoshiyuki; Hada, Kazuhiko; ; ; Nishihara, Tetsuo; Yamada, Seiya*; Sudo, Yukio
JAERI-Tech 96-053, 71 Pages, 1996/11
no abstracts in English
; ; Nakazawa, Masaharu*; *; *; ; ;
JAERI-M 84-010, 426 Pages, 1984/03
no abstracts in English
; ; *; ; ; ; ;
JAERI-M 83-196, 15 Pages, 1983/09
no abstracts in English
Sasaki, Makoto; *; Miyakawa, Shunichi; *; Sekiguchi, Yoshiyuki*; *; *
PNC TN941 80-116, 84 Pages, 1980/07
This report contains papers on planning of the Dosimetry Experiment (measurement and analysis) in Exparimental Fast Reactor "JOYO". These papers were distributed for announcement to Dep. of Fast Breeder Reactor, OEC. The preparation of the dosimetry experiment was almost complitely done in 1979. The dosimetry experiment will be excuted in 1980.
GeYasui, Akira; Fujimori, Shinichi; Kawasaki, Ikuto; Okane, Tetsuo; Takeda, Yukiharu; Saito, Yuji; Yamagami, Hiroshi; Sekiyama, Akira*; Settai, Rikio*; Matsuda, Tatsuma; et al.
no journal, ,
YbCuGe has a divalent state and a Pauli paramagnetic behavior. However, from those previous experiments, it has been not yet known the information of Yb4 electrons, for example, where 4 bands are located and whether the 4 electrons hybridize with the conduction electrons (c- hybridization) or not. In order to clarify those kind of the information, we have performed bulk-sensitive soft X-ray ARPES measurements at BL23SU in SPring-8. As a result, we found small but clear Yb multiplet peaks in the angle-integrated spectra, suggesting that it is a valence fluctuation compound. An "anti-crossing" Yb 4 bands with conduction bands were observed in the angle-resolved spectrum. This is the evidence that the Yb 4 electrons form a band state through the c- hybridization.
SiYasui, Akira; Fujimori, Shinichi; Kawasaki, Ikuto; Okane, Tetsuo; Takeda, Yukiharu; Saito, Yuji; Yamagami, Hiroshi; Sekiyama, Akira*; Settai, Rikio*; Matsuda, Tatsuma; et al.
no journal, ,
YbCuSi is one of valence fluctuating compounds. Though there are a few temperature (
)-dependent photoemission spectroscopy (PES) measurements for YbCuSi, there are different interpretations of the obtained spectra with each other. The previous studies were performed by using the vacuum ultraviolet (VUV) radiation. The VUV-PES spectra have considerably large contribution of the surface state. In order to examine the bulk electronic state in detail, it is needed to suppress the surface contribution. The soft X-ray PES (SX-PES) is a powerful tool to investigate the bulk electronic state. The SX-PES measurements were performed at BL23SU in SPring-8. In our SX-PES spectra, the surface Yb
4 contribution is very small. With increasing , the bulk Yb 4 peaks shift toward the higher energy side, while the Yb multiplets do not move. Since the energy shift cannot be explained in the single impurity Anderson model, the experimental results indicate the Kondo lattice effects play important roles for YbCuSi.
SiYasui, Akira; Fujimori, Shinichi; Kawasaki, Ikuto; Okane, Tetsuo; Takeda, Yukiharu; Saito, Yuji; Yamagami, Hiroshi; Sekiyama, Akira*; Settai, Rikio*; Matsuda, Tatsuma; et al.
no journal, ,
YbCuSi is a valence fluctuating compounds. Though there are a few temperature-dependent photoemission spectroscopy (PES) measurements, it has been not yet known whether the peak position of the Yb 4 state show the temperature dependence, that relates to the formation of the heavy fermion state. The previous studies were performed by using the vacuum ultraviolet (VUV) radiation. The VUV-PES spectra have considerably large contribution of the surface state. In order to examine the temperature dependence of the bulk electronic state in detail, we have performed the soft X-ray PES (SX-PES) for YbCuSi at BL23SU in SPring-8. With increasing temperatures, the bulk Yb 4 peaks shift toward the higher energy side, while the Yb multiplets do not move. Since the energy shift cannot be explained in the single impurity Anderson model, the experimental results indicate the Kondo lattice effects play important roles for YbCuSi.
Si using soft X-ray angle-resolved photoemission spectroscopyYasui, Akira; Fujimori, Shinichi; Kawasaki, Ikuto; Okane, Tetsuo; Takeda, Yukiharu; Saito, Yuji; Yamagami, Hiroshi; Sekiyama, Akira*; Settai, Rikio*; Matsuda, Tatsuma; et al.
no journal, ,
no abstracts in English
