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Nishida, Akemi
no journal, ,
Accidents such as oil-tank fires and breakage of members of civil structures caused by the earthquakes have occurred during the past several years. Reliability is expected to maintain the safety of infrastructures like nuclear plants. We have been focused on the construction of an analysis system called the "three-dimensional virtual plant vibration simulator," which is a numerical simulation system for a nuclear plant which considers the interconnection of machines, pipes, buildings, and their foundations under real operating conditions. In this presentation, the system configurations in a parallel distribution environment of the "assembled structural analysis" proposed for one of main technology components of three-dimensional virtual plant vibration simulator is shown. An example of the application of this system to a real nuclear-plant cooling system that has about two hundreds of millions of degrees of freedom is also shown.
Hara, Masato
no journal, ,
no abstracts in English
Miwa, Yukio
no journal, ,
no abstracts in English
Hashiba, Kimihiro; Matsui, Hiroya; Sato, Toshinori; Seno, Yasuhiro
no journal, ,
In this study, multi-stage creep tests were conducted with tuff and siliceous rock. The creep stresses of each stage and the duration of the first stage were variable, and the effect of the stress history on creep behavior was examined. It was found that the primary creep strain rate might be decreased by the stress history. In particular, the effect of the stress history was notable after the first stage with the large creep stress and the long duration. It was also found that the effect of the stress history of siliceous rock was larger than that of tuff.
Tamada, Masao
no journal, ,
In the radiation processing of polymer, graft polymerization and crosslinking induced by high energy radiation can lead the modification of polymer materials. Metal adsorbent synthesized by graft polymerization was applied to the removal of cadmium from scallop processing and the recovery of uranium from seawater. Crosslinking was available to improve the thermal properties of biodegradable polymer such as poly-lactic acid.
Matsuhashi, Shimpei
no journal, ,
no abstracts in English
Kobayashi, Yasuhiko
no journal, ,
no abstracts in English
Hada, Kazuhiko; Nishi, Hiroshi; Hirose, Takanori; Mori, Kensuke; Aoki, Shoji*; Wada, Masahiko*; Yamamichi, Tetsuo*
no journal, ,
Chromium-zirconium copper as precipitation hardened copper alloy is examined as one of the structural materials used for the ITER in vacuum vessel components. The process that consists of a thermomechanical treatments series of the solution treatment with rapid cooling to obtain the supersaturated solid solution and the aging treatment etc., is adopted in order to obtain the demanded high strength in manufacturing of this alloy material. However, as this alloy is precipitation hardened copper alloy, it is concerned that the great change in the strength characteristic is caused by the thermomechanical treatments conditions, especially the difference of the quenching cooling rate after the solution treatment in manufacturing. In this research, the influence of the quenching cooling rate condition after the solution treatment and the other conditions on this copper alloy was investigated by measuring the tensile test properties of the specimens that are prepared by treatments with some quenching cooling rate conditions after the solution treatment and aging treatment. One of the typical results from this study is that, for the quenching cooling rate after the solution treatment, it was understood that the cooling rate change from 1 to 10
C/s causes the great growth in the tensile strength. Therefore, when this alloy component is manufactured by heat history process like HIP process and needed to be treated solution treatment to be use for the structural component, it is important to guarantee the strength of the product by checking the quenching cooling rate after the solution treatment.
/U
in molten NaCl-2CsClNagai, Takayuki; Uehara, Akihiro*; Shirai, Osamu*; Yamana, Hajimu*
no journal, ,
no abstracts in English
Adachi, Motoyasu; Tamada, Taro; Sato, Katsuya*; Narumi, Issei; Kuroki, Ryota
no journal, ,
The resistance of Deinococcus radiodurans to 
-ray is 1000 times higher than that of human cells. PprA is the novel protein which promotes repairing DNA, and play a key role in the ability to resist to the radiation. The characterization of PprA have showed: (1) that the expression of PprA is controlled under another novel protein of PprI (2) that PprA promotes ligase reaction: (3) that pprA exhibits the ability to bind on DNA. In this study, our objective is the crystal structure analysis of PprA to reveal its structure-function relationships and for application as genetic and clinical tools. Here, we constructed the E. coli expression and purification system of PprA. Using the purified PprA, some small crystals in size were obtained after screening of conditions for crystalization. Beased on the analyses of DNA-PprA interaction, we showed that 280 molecules of PprA at least can bind on a DNA molecule of pUC19 plasmid (2686bp). In addition, we indicated that several DNA-PprA complexes may form higher complex, when DNA includes terminal end or nick (the cleaved part on a DNA strand). These results are important knowledge in molecular assembly and function of PprA.
Komuro, Yo; Hirade, Tetsuya; Suzuki, Ryoichi*; Odaira, Toshiyuki*; Muramatsu, Makoto*
no journal, ,
The annihilation rays from the para-pojitoronium (p-Ps) state gives narrower Doppler broadening. The broader Doppler broadening was observed at very young age region that is mainly from the annihilation process of p-Ps. It was explained by the delayed Ps slowing down and the delayed Ps formation. We have successfully obtained the experimental evidence of the delayed Ps formation.
Miyauchi, Toru; Koarashi, Jun; Mikami, Satoshi; Kozawa, Tomoyasu*; Yokota, Tomokazu*; Isaka, Keisuke*; Akiyama, Kiyomitsu
no journal, ,
no abstracts in English
Taguchi, Mitsumasa; Baldacchino, G.*; Pin, S.*; Vigneron, G.*; Hichel, B.*; Kojima, Takuji
no journal, ,
no abstracts in English
Mikami, Satoshi; Miyauchi, Toru; Koarashi, Jun; Kozawa, Tomoyasu*; Yokota, Tomokazu*; Isaka, Keisuke*; Akiyama, Kiyomitsu
no journal, ,
no abstracts in English
Koike, Masato; Sano, Kazuo*; Sasai, Hiroyuki*
no journal, ,
The flat field spectrographs are coming into the limelight once again taking the advantages of the rapid progress of the solid state imaging devices, and the needs of the ultra-high speed simultaneous measurements reaching to femto- or atto- seconds. A typical soft X-ray spectrograph employs a mechanically ruled varied-line-spacing spherical grating. We have also developed a holographic grating for this spectrograph,and spectrographs of this type are used in a variety of research areas. However it utilizes a pseudo-flat image plane near the point of inflection of the focal curve called lemniscates. Therefore the obtainable resolving power is limited and it is difficult to reach to several thousands. Also it is still a challenging subject to extend to the multi-keV region due to the degradation of the diffraction efficiency. We describe the recent progress of the soft X-ray flat field holographic grating spectrographs, a design study of a high resolution spectrograph using a varied-line-spacing plane grating, and the possible options to extend them to the multi-keV region.
Fukaya, Yuki; Kawasuso, Atsuo; Ichimiya, Ayahiko
no journal, ,
no abstracts in English
Asano, Masaharu; Chen, J.; Yamaki, Tetsuya; Yoshida, Masaru
no journal, ,
To prepare proton-conducting membranes with an excellent mechanical characteristic, a mixture of styrene and divinylbenzene was grafted into various base materials such as CF2-derivatives (PTFE, PFA and FEP) and CF2/CH2-derivatives (ETFE and PVDF). It was found that the introduction of graft-chains into CF2/CH2-derivatives was easier compared with that of CF2-derivatives. These derivatives that introduced the graft-chains were then sulfoanted, in order to determine the tensile strength, as a resulting of higher tensile strength for sulfonated CF2/CH2-derivatives
Seki, Takayoshi; Hanada, Masaya; Tobari, Hiroyuki; Inoue, Takashi; Takado, Naoyuki*; Mizuno, Takatoshi*; Hatayama, Akiyoshi*; Kashiwagi, Mieko; Taniguchi, Masaki; Watanabe, Kazuhiro; et al.
no journal, ,
no abstracts in English