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Yamashita, Takuya
Fukushima Daiichi Nuclear Power Station Accident Information Collection and Evaluation (FACE) Project Annual Report 2023, p.55 - 62, 2024/11
Suzuki, Masaaki*; Ito, Mari*; Hashidate, Ryuta; Takahashi, Keita; Yada, Hiroki; Takaya, Shigeru
2020 9th International Congress on Advanced Applied Informatics (IIAI-AAI 2020), p.797 - 801, 2021/07
Ishiyama, Shintaro; Minami, Mamoru*
Journal of Bioinformatics and Biological Engineering (Internet), 2(1), p.63 - 74, 2014/11
New control scheme Move on Sensing (MOS) technology was proposed and demonstrated its great potential as autonomous control system to be able to respond to interaction with growing simulation environment of differentiated iPS cells and the following results are derived; (1) Remove of the targeted cell models is completed by 20 times selection process from original cell group model composed of 20 red and 20 blue colored beads within 16 sec per cell. (2) High-accuracy sorting operation of iPS cell model was achieved within 16 sec per cell. (3) Retrievability of the discrete cell models isolated from group model is ensured by use of the MOS control.
Ishida, Hisashi
Proteins; Structure, Function, and Bioinformatics, 82(9), p.1985 - 1999, 2014/09
Times Cited Count：10 Percentile：30.17(Biochemistry & Molecular Biology)Li, H.*; Sakuraba, Shun; Chandrasekaran, A.*; Yang, L.-W.*
Journal of Chemical Information and Modeling, 54(8), p.2275 - 2285, 2014/08
Times Cited Count：17 Percentile：69.13(Chemistry, Medicinal)We provide evidence supporting that protein-protein and protein-ligand docking poses are functions of protein shape and intrinsic dynamics. Over sets of 68 protein-protein complexes and 240 non-homologous enzymes, we recognize common predispositions for binding sites to have minimal vibrations and angular momenta while two interacting proteins orient so as to maximize the angle between their rotation/bending axes (
). The findings are then used to define quantitative criteria to filter out docking decoys less likely to be the near-native poses, hence the chances to find near-native hits can be doubled. With the novel approach to partition a protein into "domains" of robust but disparate intrinsic dynamics, 90% of catalytic residues in enzymes can be found within the first 50% of the residues closest to the interface of these dynamics domains. The results suggest an anisotropic rather than isotropic distribution of catalytic residues near the mass centers of enzymes.
Koide, Kaoru; Koike, Katsuaki*
International Journal of Applied Earth Observation and Geoinformation, 19, p.88 - 103, 2012/10
Times Cited Count：7 Percentile：25.89(Remote Sensing)This paper presents a method for detecting high water-table areas based on vegetation information in a humid warm-temperate forest area using remotely sensed data (SPOT). The purpose is to develop methodologies for characterizing hydrogeological structures at a regional scale. To detect differences in vegetation conditions due to groundwater supply, a new vegetation index (AgbNDVI) and a segmentation analysis based on geographical characteristics were proposed. A study area was selected in the Tono region of central Japan. As a result, most of the high-VI points are located on the concave/convex slopes, in the vicinity of geologic boundaries, around groundwater seeps and in high water-table areas. Therefore, high-VI points can be a crucial marker for estimating hydraulic properties of geologic structures and groundwater flow regime. Consequently, the proposed method can be an useful tool to detect high water-table areas in humid warm-temperate forest areas.
Hoshiya, Taiji; Nishimura, Akihiko; Nishikawa, Masahiro*
Literacy Information and Computer Education Journal (Internet), 3(2), p.694 - 706, 2012/06
The Kids' Science Museum of Photons, which is attached to the Kansai Photon Science Institute of the JAEA and is managed as an unique and experienced study type of museum with the theme of the photon science, provides us with the mystery of light through various exhibits, theater, and experimental events. In this research, the outline of science communication activities of energy and environmental education such as recent coordinated course, the experiment booth village and the science-walker is discussed in the degree of understanding, inquiring mind and its effects.
Sato, Takumi; Nishihara, Kenji; Hayashi, Hirokazu; Kurata, Masaki*; Arai, Yasuo
Proceedings of 11th OECD/NEA Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation (Internet), 9 Pages, 2012/00
Nitride fuel cycle for transmutation of long-lived minor actinides (MAs) has been developed in Japan Atomic Energy Agency (JAEA) under the double-strata nuclear fuel cycle concept. This study aims at developing the process flow diagram with the material balance sheet of the pyrochemical reprocessing of spent nitride fuel for ADS to evaluate the technological feasibility of the fuel cycle. Three process flow diagrams were proposed in this work: (1) the currently-proposed process with the molten salt electrorefining of spent nitride fuel, (2) the process with the molten salt electrorefining of the actinide-cadmium alloy after the chemical dissolution of spent nitride fuel, and, (3) the process combining the chemical dissolution of spent nitride fuel and the multi-stage counter current extraction. Moreover, the material balance was evaluated for the process (1) by use of the calculated and experimental data of the nitride fuel for ADS.
Tomiyama, Shin*; Mimura, Hitoshi*; Niibori, Yuichi*; Yamagishi, Isao; Morita, Yasuji
Proceedings of 11th OECD/NEA Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation (Internet), 10 Pages, 2012/00
The immobilization of Cs has been studied by the calcination of the Cs-form of various kinds of mordenites. In this study, the effect of various parameters such as calcining temperature and time, components in mordenites, conditions for cold and hot pressing, on the immobilization of Cs in ceramic products are evaluated by using X-ray diffractometry (XRD), density balance (Archimedes' method), scanning electron microscopy (SEM) and electron probe microanalysis (EPMA). Results showed that recrystallization to the stable ceramic solid forms of CsAlSi
O
was achieved only in calcination of Synthetic Mordenite-C which contains Ti and Fe as binder. The Cs-form mordenites were pelletized into a disk by cold isostatic pressing and the density of the solid forms increased with calcining temperature and time.
Morita, Yasuji; Kimura, Takaumi
Proceedings of 11th OECD/NEA Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation (Internet), p.235 - 244, 2012/00
Separation process for transuranium elements (TRU = Am, Cm, Np and Pu) and some fission products (Sr, Cs and Mo) has been developed at Japan Atomic Energy Agency using new innovative extractants and adsorbents to improve the partitioning process from viewpoints of the economy and the reduction of secondary wastes. Phosphorus-free compounds consisting of carbon, hydrogen, oxygen and nitrogen (CHON principle) were applied to the separation steps for TRU, Cs and Sr by using solvent extraction or extraction chromatography. Mo is separated by adsorption with an iron oxide adsorbent. This paper gives results of the research and development of the separation process.
Matsumura, Tatsuro; Morita, Yasuji; Matsumura, Kazumi; Sano, Yuichi; Koma, Yoshikazu; Nomura, Kazunori
Proceedings of 11th OECD/NEA Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation (Internet), 8 Pages, 2012/00
no abstracts in English
Minato, Kazuo; Morita, Yasuji; Tsujimoto, Kazufumi; Koyama, Shinichi; Kurata, Masaki*; Inoue, Tadashi*; Ikeda, Kazumi*
Proceedings of 11th OECD/NEA Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation (Internet), p.341 - 349, 2012/00
In order to provide a quantitative assessment for the maturity of the partitioning and transmutation technology relative to its full-scale deployment, a technology readiness level (TRL) process was used. The definitions of TRL used in this study were based on those used in the Global Nuclear Energy Partnership (GNEP). The TRL was evaluated and the technology pathway was discussed for the systems of FBR and ADS for the minor actinides (MA) transmutation, MA partitioning processes, and MA-bearing fuels. Through the evaluation, it was recognized that hard requirements to be satisfied were present at TRL 5 for each technology development. The introduction of lab-scale tests with actual spent fuel for MA partitioning process and with actual separated materials for MA-bearing fuels fabrication and irradiation before the engineering scale tests may be effective and efficient solution.
Nishihara, Kenji; Sugawara, Takanori; Iwamoto, Hiroki; Alvarez Velarde, F.*; Rineiski, A.*
Proceedings of 11th OECD/NEA Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation (Internet), p.315 - 327, 2012/00
Accuracy of nuclear data, especially for minor actinides (MAs), is important in neutronics design of advanced reactors for MA transmutation such as an Accelerator-Driven System (ADS). Authors introduce the results of a benchmark activity in the IAEA CRP that revealed a discrepancy among k-effectives by different nuclear data libraries is as large as 3% even for an initial criticality before burn-up. In order to reduce this uncertainty, Transmutation Physics Experimental Facility (TEF-P) with a significant amount of MA is being proposed in the J-PARC project. An expected reduction of the uncertainty of criticality, void reactivity and Doppler coefficient by the TEF-P was numerically evaluated using the cross-section adjustment procedure based on the JENDL3.3. The uncertainty would be reduced from 1.3% to 0.6% if experimental results of the TEF-P and other past critical experiments were utilized to adjust nuclear data.
Oigawa, Hiroyuki; Minato, Kazuo; Morita, Yasuji; Kimura, Takaumi; Arai, Yasuo; Tsujimoto, Kazufumi; Nishihara, Kenji
Proceedings of 11th OECD/NEA Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation (Internet), p.123 - 132, 2010/11
After the first check and review on the partitioning and transmutation (PT) technology by the Japan Atomic Energy Commission (JAEC) in 2000, significant progress was made in respective research areas of the partitioning, fuel fabrication, transmutation and fuel recycling in Japan. The second check and review on the PT technology was made by the JAEC in 2008-2009. The final report issued in April, 2009, mentions that the significance of the PT technology is in three points: reduction of the potential hazard, mitigation of the requirement for geological repository site, and enhancement of the options in the design of the whole system of waste disposal. The current technology levels of the PT for both FBR and ADS were evaluated. The PT technology in general is still in the basic research because of the lack of experimental data for minor actinides (MA). It was, therefore, strongly recommended to accumulate the experimental data for MA as a common basis for both FBR and ADS.
Arai, Yasuo; Akabori, Mitsuo; Minato, Kazuo; Uno, Masayoshi*
Proceedings of 10th OECD/NEA Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation (CD-ROM), p.189 - 197, 2010/00
The progress of R&D on nitride fuel and pyrochemical process for transmutation of minor actinides are described. Nitride fuel was prepared by carbothermic reduction and characterized by X-ray diffraction and chemical analyses. In addition to minor actinide nitrides, burnup simulated nitrides and nitrides with inert diluent materials were prepared, and the thermal properties such as thermal conductivity were obtained. With regard to pyrochemical process, the electrode behavior of the above nitrides in the molten salt was clarified, and nitride power synthesized from actinides recovered in liquid cadmium cathode was used for nitride pellet preparation. Further, the irradiation tests of nitride fuel carried out in JAEA are introduced.
Nishi, Tsuyoshi; Takano, Masahide; Ito, Akinori; Akabori, Mitsuo; Arai, Yasuo; Minato, Kazuo
Proceedings of 10th OECD/NEA Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation (CD-ROM), 8 Pages, 2010/00
Neptunium nitride (NpN) and americium nitride (AmN) were prepared by carbothermic reduction of the respective dioxides. The thermal diffusivities of NpN and AmN were measured by using a laser flash method. The heat capacities of NpN and AmN were determined with the drop calorimetry. The thermal diffusivity of NpN tends to remain unchanged with increasing temperature in the temperature range from 473 to 1473 K, and that of AmN tends to slightly decrease with increasing temperature in the same temperature range. The heat capacity of NpN obtained was close to those of UN and PuN, while that of AmN was slightly smaller than those of UN, NpN and PuN. The thermal conductivities of NpN and AmN were determined from the measured thermal diffusivities, heat capacities and bulk densities. It was found that the thermal conductivities of NpN and AmN slightly increased with temperature in the temperature range investigated.
Kikuchi, Kenji; Saito, Shigeru; Hamaguchi, Dai; Tezuka, Masao; Obayashi, Hironari
Proceedings of 10th OECD/NEA Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation (CD-ROM), p.315 - 320, 2010/00
R&Ds to know materials performance and its limit for usage applying to the beam window of ADS are conducted by irradiation material test and lead bismuth flowing loop tests. Proton irradiation experiment showed ductility reduction and off-set stress increase in austenitic steels. Fracture mode change in ferritic-martensitic steels, 8-9 Cr steels. Fatigue test is under way in the hot cell. Microstructure analyses found that many bubbles exist in the materials. The relation between mechanical strength and nano-scale observation results is studied now. Corrosion of the materials under the lead bismuth flows showed local erosion-corrosion. A visualization technique has developed by using ultrasonic Doppler method and surface vitalizing techniques to inspect a local flow condition. Thermal fluid experiment was conducted to know heat transfer performance at the beam window, which will affect thermal loading magnitude. Experimental formula was established for design work.
Matsumura, Tatsuro; Takeshita, Kenji*; Inaba, Yusuke*; Mori, Atsunori*
Proceedings of 10th OECD/NEA Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation (CD-ROM), 6 Pages, 2010/00
no abstracts in English
Kimura, Takaumi; Morita, Yasuji; Koma, Yoshikazu
Proceedings of 10th OECD/NEA Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation (CD-ROM), p.243 - 249, 2010/00
no abstracts in English
Hayashi, Hirokazu; Akabori, Mitsuo; Arai, Yasuo; Minato, Kazuo
Proceedings of 10th OECD/NEA Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation (CD-ROM), 9 Pages, 2010/00
R&D on the transmutation of long-lived minor actinides (MA) by the accelerator-driven system (ADS) using nitride fuels is underway at JAEA. In regard to reprocessing technology, pyrochemical process has several advantages in case of treating spent fuel with large decay heat and fast neutron emission, and recovering highly enriched 
N. In the pyrochemical reprocessing, plutonium and MA are dissolved in LiCl-KCl eutectic melts and selectively recovered into liquid cadmium cathode by molten salt electrorefining. The electrochemical behavior in LiCl-KCl eutectic melts and the subsequent nitride formation behavior of plutonium and MA recovered in liquid Cd cathode are investigated. Recent results on the behavior of americium (Am) in the pyrochemical process for the treatment of spent nitride fuel, which include preparation of AmCl
and electrochemical behavior of Am in LiCl-KCl eutectic melts, are presented.
