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Lee, S.; Yoshikawa, Hideki; Matsui, Toshiya*
Materials Research Society Symposium Proceedings, Vol.1265, p.209 - 214, 2010/11
A corrosion experiment were performed for carbon steel contacted with iron reducing bacteria. After incubation for 41 days, biofilm and some corrosion products were observed and determined by SEM analysis. It is clear that Vivianite, which is considered as a protect material for iron corrosion, has been generated as an iron corrosion product with contribution of iron reducing bacteria from this experiment.
Sugita, Yutaka; Nakamura, Takahiro; Sanada, Hiroyuki; Aizawa, Takao*; Ito, Shunichiro*
Materials Research Society Symposium Proceedings, Vol.1265, p.39 - 44, 2010/11
The creation of an excavation disturbed zone (EDZ) is expected around the gallery when the gallery is excavated in the underground to dispose the radioactive waste. In-situ EDZ experiment has been performed to determine the rock properties and width of the EDZ in 140m gallery at a depth of 140m below the surface at Horonobe URL. In the experiment, seismic tomography measurement was performed by using seismic source to observe width of the EDZ. Observation area is 3m square horizontal plane along the sidewall of the 140m gallery. During excavation of the 140m gallery, seismic tomography measurement was performed repeatedly with processing of excavation of the gallery, and the change of velocity distribution of the rock around the gallery was observed. Seismic tomography investigation caught the EDZ developed around the excavated gallery.
Si
)
Kamakura, Nozomu; Okane, Tetsuo; Takeda, Yukiharu; Fujimori, Shinichi; Saito, Yuji; Yamagami, Hiroshi; Fujimori, Atsushi; Fujita, Asaya*; Fujieda, Shun*; Fukamichi, Kazuaki*
Materials Research Society Symposium Proceedings, Vol.1262, 6 Pages, 2010/10
In
and PuGa (=Co, Rh)Sakai, Hironori; Kambe, Shinsaku; Tokunaga, Yo; Haga, Yoshinori; Baek, S.-H.*; Ronning, F.*; Bauer, E. D.*; Thompson, J. D.*
Materials Research Society Symposium Proceedings, Vol.1264, p.69 - 79, 2010/10
The anisotropy of antiferromagnetic spin fluctuations has been investigated microscopically in the heavy fermion systems of CeIn and PuGa (=Co, Rh) by means of nuclear magnetic resonance (NMR). Both systems are known to be relatively high-
superconductors among the heavy fermion systems, especially PuCoGa, which has a =18.5 K almost one order of magnitude larger than for CeCoIn (=2.3 K). Analysis of the Knight shift and spin-lattice relaxation rates suggests XY-type anisotropy in the antiferromagnetic spin fluctuations in the normal states of these unconventional superconductors. Moreover, the 115 superconductors with larger XY-type fluctuations have a higher , compared with the anisotropy of spin fluctuations in the related paramagnetic system UFeGa and antiferromagnets UPtGa, NpCoGa, NpFeGa.
Ishii, Yasuo; Seida, Yoshimi; Tachi, Yukio; Yoshikawa, Hideki
Materials Research Society Symposium Proceedings, Vol.1265, p.233 - 238, 2010/09
Influence of stagnation of the test tracer solution and diffusion resistance in the filters on data acquisition were measured by Cs
and I
diffusion experiments and the range of uncertainties of these effects was estimated by calculation of the simulated experimental component. From the ID experiment and the model analysis, it was found that the simultaneous data acquisition of RD and ID methods decreased the residue of retardation parameters effectively.
Matsumura, Daiju; Okajima, Yuka; Nishihata, Yasuo; Mizuki, Junichiro
Materials Research Society Symposium Proceedings, Vol.1262, 6 Pages, 2010/05
Dynamic local structural change of Pd nanoparticles on alumina surface during hydrogen absorption process was directly observed by X-ray absorption fine structure spectroscopy with dispersive mode. Main four parameters of X-ray absorption spectroscopy were determined even in the case of 50 Hz observation. It is clearly revealed that Pd nanoparticles directly change to the hydride phase in 50 ms at 200 kPa of hydrogen pressure. Significant structural distortion was not investigated in the results of the Debye-Waller factor.
Sasaki, Takuo*; Suzuki, Hidetoshi*; Sai, Akihisa*; Takahashi, Masamitsu; Fujikawa, Seiji; Oshita, Yoshio*; Yamaguchi, Masafumi*
Materials Research Society Symposium Proceedings, Vol.1268, 6 Pages, 2010/05
Times Cited Count：0 Percentile：0.01(Materials Science, Multidisciplinary)Hatanaka, Koichiro; Lim, D.-H.*; Ishii, Eiichi
Materials Research Society Symposium Proceedings, Vol.1265, 6 Pages, 2010/00
A three-dimensional DFN geo-descriptive model is developed for WCFs in the sedimentary formations of Horonobe URL in Japan. Fracturing and faulting system in/around the URL area, which is the main investigation area of the Horonobe URL project, is characterized by taking into account borehole geophysical logging data, regional geologic/structural data, and fracture/fault data (orientation, intensity, size) obtained from the surface-based investigations. Volumetric fracture intensity potential is estimated by the correlation and the multi-linear regression analysis of observed data, and is used as one of controls for 3-D DFN model. A regional scale 3-D geo-descriptive DFN model is constructed based on the analyzed fracturing system identified for the WCFs. The current 3-D geo-descriptive model could be utilized explicitly to derive PA parameters for the hypothetical repository of the high-level radioactive wastes in Japan, and to assist optimization of the safe repository design.
Fe M
ssbauer spectrometer using synchrotron radiation and its application to ultrahigh-pressure study on metal hydridesMitsui, Takaya; Hirao, Naohisa*
no journal, ,
no abstracts in English
using soft X-ray emission and absorption spectroscopyTakeda, Yukiharu; Saito, Yuji; Yamagami, Hiroshi; Saito, Hiroyuki; Machida, Akihiko; Aoki, Katsutoshi; Muro, Takayuki*; Kato, Yukako*; Kinoshita, Toyohiko*
no journal, ,
no abstracts in English
Fukidome, Hirokazu*; Takahashi, Ryota*; Imaizumi, Kei*; Handa, Hiroyuki*; Suemitsu, Maki*; Yoshigoe, Akitaka; Teraoka, Yuden
no journal, ,
Graphene layers could be formed firstly on an SiC thin film, which is fabricated on an Si substrate by a gas-source MBE method, by thermal annealing in vacuum (GOS structure). It should be controlled the interface between the SiC film and the graphene layers. In this study, relationships between chrystallographic symmetries of the Si substrate and the interface in the GOS structure were investigated. After an SiC(110), SiC(100), and SiC(111) surface is formed on the Si(110), Si(100), and Si(111) substrate, respectively, graphene layers were formed by thermal annealing of these SiC thin films up to 1523 K in vacuum. Photoemission spectroscopy of C1s core level with synchrotron radiation revealed that no interfacial layers are formed between the graphene and the SiC(110) and SiC(100) films while an interfacial layer is formed on the SiC(111) film.
