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Matsuda, Yasuhiro*; Her, J. L.*; Inami, Toshiya; Owada, Kenji; Ouyang, Z. W.*; Okada, Kyoko*; Nojiri, Hiroyuki*; Mitsuda, Akihiro*; Wada, Hirofumi*; Yoshimura, Kazuyoshi*; et al.
Journal of Physics; Conference Series, 190, p.012019_1 - 012019_6, 2009/11
Times Cited Count：7 Percentile：85.12(Physics, Condensed Matter)Go, Yasuhiro*; Yoshida, Hiromi*; Jo, Akinori*; Tamada, Masao; Katakai, Akio
Proceedings of 2008 Conference on Ion Exchange Technology (IEX 2008), p.353 - 361, 2008/07
Although granular anion exchange resins are useful for column-mode removal of nitrate in water, sizes of granular resins used in industrial scale columns are ca. 0.5 mm to reduce pressure loss in column operations. Since large granular resins bring down adsorption kinetics, it is difficult to supply water polluted with nitrate to granular resin packed columns at extremely high flow rates more than 1000 h
in space velocity (SV). In this work, we have prepared an anion exchange fiber named FBDA, which rapidly takes up nitrate in column-mode even at the flow rate of feed of 3000 h in SV. FBDA was prepared by electron beam irradiation induced liquid phase graft polymerization of chloromethylstyrene (CMS) onto polyethylene-coated polypropylene fiber (PPPE; 1.5 denier) and the subsequent quaternization of the CMS-grafted fiber with n-butyldimethylamine (BDA). The resulting BDA-fixed fiber (FBDA) has anion exchange capacity of 2.2 meq/g. To the column (i.d. 1.3 cm) containing 2.0 mL wet FBDA, 1 mM nitrate feeding solutions in the absence and presence of a competing anion was fed to the column at given flow rates. In the absence of a competing anion, shapes of breakthrough profiles of nitrate are independent of the flow rates from 1000 to 3000 h in SV, giving the constant breakthrough capacity for nitrate as high as 1.1 mmol/g. Effect of chloride and sulfate was tested at the flow rate of 1000 h. In the presence of 1 mM and 5 mM chloride, breakthrough capacities for nitrate were reduced to 0.83 and 0.48 mmol/g, respectively. However, equimolar sulfate reduced the breakthrough capacity down to 0.43 mmol/g. Thus, the presented FBDA is useful for rapid purification of water contaminated with low concentration levels of nitrate, so long as concentrations of chloride and sulfate are nearly equal orders as those in most river waters. Almost the same results were also obtained in case of the triethylamine-fixed fiber named FTEA.
Seno, Yasuhiro; Nakama, Shigeo; Sato, Toshinori*; Goke, Mitsuo*; Tada, Hiroyuki*; Sakurai, Hideyuki*
JAEA-Research 2007-081, 120 Pages, 2008/01
JAEA-Research-2007-081.pdf:13.48MB
A 3D Crack Tensor Model analysis was carried out to predict the rock mass behavior of the complex (articulated) section at -500 m. Properties were chosen based on the Rock Mechanics Model constructed in the Surface-based Investigation Phase (Phase I). The Virtual Fracture Model was applied to analyze the change the hydraulic conductivity.
Goke, Mitsuo*; Tada, Hiroyuki*; Seno, Yasuhiro; Nakama, Shigeo; Sato, Toshinori
Tonneru Kogaku Rombunshu, 16, p.35 - 45, 2006/11
no abstracts in English
Sato, Toshinori; Mikake, Shinichiro; Nakama, Shigeo; Seno, Yasuhiro; Mori, Takayuki*; Iwano, Keita*; Goke, Mitsuo*; Tada, Hiroyuki*
Proceedings of 7th International Conference on Analysis of Discontinuous Deformations (ICADD-7) (CD-ROM), p.245 - 256, 2005/12
Two one-thousand meter deep shafts and research galleries at several levels will be excavated in granite for the Mizunami Underground Research Laboratory (MIU) project. Research on the deep geological environment in this project will provide the basis for Research and Development on geological disposal of high-level radioactive waste. The site of MIU project is located in Mizunami, Gifu, in the central part of the main island of Japan. By July 2003, entrances to the shafts were constructed, and excavation of lower part of shaft entrance was started in March 2004. Current status (September 2005) of construction is excavation of the shafts to a depth of 150 m has been done. Mechanical investigations including hydraulic fracturing test and laboratory tests on core samples were performed, and numerical analysis using continuous model and discontinuous model; MBC (Micro-mechanics based continuum model), Crack tensor model and FRACOD (fracture propagation code), were also performed to predict mechanical stability of openings and support systems, and rock mass behavior around openings. In this analysis EDZ (Excavation Damaged Zone) due to blasting and excavation step were considered in same cases. This paper describes the current status of Mizunami Underground Research Laboratory for crystalline rock and the results of prediction for rock mass behavior around the deep underground openings using some analytical methods. Measurements during shaft sinking and future plan of investigations in the URL are also describes in this paper.
Arai, K.*; Ninomiya, Akira*; Ishigooka, Takeshi*; Takano, Katsutoshi*; Nakajima, Hideo; Michael, P.*; Vieira, R.*; Martovetsky, N.*; Sborchia, C.*; Alekseev, A.*; et al.
Cryogenics, 44(1), p.15 - 27, 2004/01
Times Cited Count：3 Percentile：15.44(Thermodynamics)no abstracts in English
Kato, Takashi; Tsuji, Hiroshi; Ando, Toshinari; Takahashi, Yoshikazu; Nakajima, Hideo; Sugimoto, Makoto; Isono, Takaaki; Koizumi, Norikiyo; Kawano, Katsumi; Oshikiri, Masayuki*; et al.
Fusion Engineering and Design, 56-57, p.59 - 70, 2001/10
Times Cited Count：17 Percentile：74.75(Nuclear Science & Technology)no abstracts in English
Tsuji, Hiroshi; Okuno, Kiyoshi*; Thome, R.*; Salpietro, E.*; Egorov, S. A.*; Martovetsky, N.*; Ricci, M.*; Zanino, R.*; Zahn, G.*; Martinez, A.*; et al.
Nuclear Fusion, 41(5), p.645 - 651, 2001/05
Times Cited Count：57 Percentile：83.34(Physics, Fluids & Plasmas)no abstracts in English
Go, Yasuhiro*; Matsuura, Hirotaka*; Jo, Akinori*; Tamada, Masao; Katakai, Akio
no journal, ,
Chloromethyl styrene was grafted on polyolefin fibers. The obtained fibers were reacted with dimethylaminoethanol in ethanol. The resulting anion exchange fiber has 2.3 mmol/g of anion exchange capacity. After treatment with chlorine ion, the anion exchange fiber could adsorb the nitrate ion of 1.3 mmol/g-adsorbent at space velocity of 2000 h. This result implies that this anion exchange fiber can adsorb the nitrate ion rapidly.
Seno, Yasuhiro; Mori, Takayuki*; Goke, Mitsuo*; Nakama, Shigeo; Sato, Toshinori*
no journal, ,
The Excavation Disturbed Zone is defined as the zone host rock around an underground excavation whose characteristics are altered by excavation. This includes the Excavation Damaged Zone, Stress Redistribution Zone and Unsaturated Zone. It is assumed that such zone will become a selective pathway for the migration of groundwater and/or radioactive materials. Therefore, for the design of geological repository where low permeability is required, it is important to establish an accurate method for evaluating and predicting the rock mass behavior due to excavation. This paper describes the results of 3D FEM analysis results using two type continuous models that consider the reduction of stiffness of the Excavation Damaged Zone due to blasting.
Go, Yasuhiro*; Kosai, Hideyuki*; Jo, Akinori*; Katakai, Akio; Tamada, Masao
no journal, ,
no abstracts in English
Go, Yasuhiro*; Matsuura, Hirotaka*; Jo, Akinori*; Katakai, Akio; Tamada, Masao
no journal, ,
no abstracts in English
Go, Yasuhiro*; Yoshida, Hiromi*; Jo, Akinori*; Katakai, Akio; Tamada, Masao
no journal, ,
no abstracts in English
