JOPSS - Search Results

By using the six sets of interatomic potentials for face-centredcubic metals that differ in the stacking fault energy (SFE) while most of the other material parameters are kept almost identical, we conducted molecular dynamics simulations to evaluate the effects of SFE on the defect formation process through collision cascades. The ratio of glissile SIA clusters tends to decrease with increasing SFE. This is because perfect loops, the edges of which split into two partial dislocations with stacking fault structures between them in most cases, prefer to form at lower SFEs. The enhanced formation of glissile SIA clusters at lower SFEs can also be observed even at increased temperature.

Journal Articles

Interactions between clusters of self-interstitial atoms via a conservative climb in BCC-Fe

Hayakawa, Sho*; Okita, Taira*; Itakura, Mitsuhiro; Aichi, Masaatsu*; Suzuki, Katsuyuki*

Philosophical Magazine, 98(25), p.2311 - 2325, 2018/06

https://doi.org/10.1080/14786435.2018.1486047

Times Cited Count：8 Percentile：40.32(Materials Science, Multidisciplinary)

We conduct kinetic Monte Carlo simulations for the conservative climb motion of a cluster of self-interstitial atoms towards another SIA cluster in BCC Fe; the conservative climb velocity is inversely proportional to the fourth power of the distance between them, as per the prediction based on Einstein's equation. The size of the climbing cluster significantly affects its conservative climb velocity, while the size of the cluster that originates the stress field does not. The activation energy for the conservative climb is considerably greater than that derived in previous studies and strongly dependent on the climbing cluster size.

Journal Articles

Atomic simulations to evaluate effects of stacking fault energy on interactions between edge dislocation and spherical void in face-centred cubic metals

Doihara, Kohei*; Okita, Taira*; Itakura, Mitsuhiro; Aichi, Masaatsu*; Suzuki, Katsuyuki*

Philosophical Magazine, 98(22), p.2061 - 2076, 2018/05

https://doi.org/10.1080/14786435.2018.1472401

Times Cited Count：20 Percentile：70.88(Materials Science, Multidisciplinary)

In this study, molecular dynamics simulations were performed to elucidate the effects of stacking fault energy (SFE) on the physical interactions between an edge dislocation and a spherical void in the crystal structure of face-centred cubic metals at various temperatures and for different void sizes. Four different types of interaction morphologies were observed, in which (1) two partial dislocations detached from the void separately, and the maximum stress corresponded to the detachment of the trailing partial; (2) two partial dislocations detached from the void separately, and the maximum stress corresponded to the detachment of the leading partial; (3) the partial dislocations detached from the void almost simultaneously without jog formation; and (4) the partial dislocations detached from the void almost simultaneously with jog formation. With an increase in void size or SFE, the interaction morphology changed in the above-mentioned order. It was observed that the magnitude of the critical resolved shear stress (CRSS) and its dependence on the SFE were determined by these interaction morphologies. The value of the CRSS in the case of interaction morphology (1) is almost equal to an analytical one based on the linear elasticity by employing the Burgers vector of a single partial dislocation. The maximum value of the CRSS is also obtained by the analytical model with the Burgers vector of the two partial dislocations.

Journal Articles

Evaluation of the relative biological effectiveness of carbon ion beams in the cerebellum using the rat organotypic slice culture system

Yoshida, Yukari*; Suzuki, Yoshiyuki*; Al-Jahdari, W. S.*; Hamada, Nobuyuki*; Funayama, Tomoo; Shirai, Katsuyuki*; Kato, Hiroyuki*; Sakashita, Tetsuya; Kobayashi, Yasuhiko; Nakano, Takashi*

Journal of Radiation Research, 53(1), p.87 - 92, 2012/02

https://doi.org/10.1269/jrr.11139A

Times Cited Count：8 Percentile：41.78(Biology)

Journal Articles

Effectiveness of carbon-ion beams for apoptosis induction in rat primary immature hippocampal neurons

Kaminuma, Takuya*; Suzuki, Yoshiyuki*; Shirai, Katsuyuki*; Mizui, Toshiyuki*; Noda, Shinei*; Yoshida, Yukari*; Funayama, Tomoo; Takahashi, Takeo*; Kobayashi, Yasuhiko; Shirao, Tomoaki*; et al.

Journal of Radiation Research, 51(6), p.627 - 631, 2010/11

https://doi.org/10.1269/jrr.10050

Times Cited Count：9 Percentile：33.81(Biology)

Journal Articles

Simple orchestration application framework to control "Burning Plasma Integrated Code"

Tatekawa, Takayuki; Nakajima, Kohei*; Teshima, Naoya; Kim, G.; Suzuki, Yoshio; Takemiya, Hiroshi; Hayashi, Nobuhiko; Iba, Katsuyuki*

Proceedings of 3rd International Joint Conference on Computational Sciences and Optimization (CSO 2010), p.322 - 326, 2010/05

Journal Articles

Web-based Java application to advanced JT-60 Man-Machine interfacing system for remote experiments

Totsuka, Toshiyuki; Suzuki, Yoshio; Sakata, Shinya; Oshima, Takayuki; Iba, Katsuyuki*

Fusion Engineering and Design, 83(2-3), p.287 - 290, 2008/04

https://doi.org/10.1016/j.fusengdes.2008.02.003

Times Cited Count：1 Percentile：10.01(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Research and development of fusion grid infrastructure based on Atomic Energy Grid InfraStructure (AEGIS)

Suzuki, Yoshio; Nakajima, Kohei; Kushida, Noriyuki; Kino, Chiaki; Aoyagi, Tetsuo; Nakajima, Norihiro; Iba, Katsuyuki*; Hayashi, Nobuhiko; Ozeki, Takahisa; Totsuka, Toshiyuki; et al.

Fusion Engineering and Design, 83(2-3), p.511 - 515, 2008/04

https://doi.org/10.1016/j.fusengdes.2007.09.017

Times Cited Count：3 Percentile：23.51(Nuclear Science & Technology)

In collaboration with the Naka Fusion Institute of Japan Atomic Energy Agency (NFI/JAEA) and the National Institute for Fusion Science of National Institute of Natural Science (NIFS/NINS), Center for Computational Science and E-systems of Japan Atomic Energy Agency (CCSE/JAEA) aims at establishing an integrated framework for experiments and analyses in nuclear fusion research based on the Atomic Energy Grid InfraStructure (AEGIS). AEGIS has been being developed by CCSE/JAEA aiming at providing the infrastructure that enables atomic energy researchers in remote locations to carry out R&D efficiently and collaboratively through the Internet. Toward establishing the integrated framework, we have been applying AEGIS to pre-existing three systems.

Journal Articles

Development and verification of remote research environment based on "Fusion research grid"

Iba, Katsuyuki*; Ozeki, Takahisa; Totsuka, Toshiyuki; Suzuki, Yoshio; Oshima, Takayuki; Sakata, Shinya; Sato, Minoru; Suzuki, Mitsuhiro; Hamamatsu, Kiyotaka; Kiyono, Kimihiro

Fusion Engineering and Design, 83(2-3), p.495 - 497, 2008/04

https://doi.org/10.1016/j.fusengdes.2007.11.001

Times Cited Count：4 Percentile：29.44(Nuclear Science & Technology)

Fusion research grid is an environment of collaborative researches using a network that connects scientists far apart and let them collaborate effectively over the difference in time and distance in a nuclear fusion research. Fundamental technology of Fusion research grid has been developed at JAEA in the VizGrid project under the e-Japan project at Ministry of Education, Culture, Sports, Science and Technology (MEXT). Remote research environments of experiments, diagnostics, analyses and communications were developed on Fusion research grid. We have developed prototype systems that include a remote experiment system, a remote diagnostics system, and a remote analysis system. All users can access these systems from anywhere because Fusion research grid does not required closed network like Super SINet to maintain security. The prototype systems were verified in experiments at JT-60U and their availability was confirmed.

Journal Articles

Research into the radiosensitivity of normal brain tissue

Suzuki, Yoshiyuki*; Yoshida, Yukari*; Shirai, Katsuyuki*; Hamada, Nobuyuki*; Mizui, Toshiyuki*; Noda, Shinei*; Funayama, Tomoo; Sakashita, Tetsuya; Kobayashi, Yasuhiko; Shirao, Tomoaki*; et al.

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 107, 2007/02

https://jopss.jaea.go.jp/pdfdata/JAEA-Review-2006-042.pdf

Journal Articles

Differential effects of X-irradiation on immature and mature hippocampal neurons in vitro

Shirai, Katsuyuki*; Mizui, Toshiyuki*; Suzuki, Yoshiyuki*; Kobayashi, Yasuhiko; Nakano, Takashi*; Shirao, Tomoaki*

Neuroscience Letters, 399(1-2), p.57 - 60, 2006/05

https://doi.org/10.1016/j.neulet.2006.01.048

Times Cited Count：22 Percentile：34.89(Neurosciences)

no abstracts in English

JAEA Reports

Evaluation of radioactive corrosion products behaviour in primary systems of experimental fast reactor JOYO

; Chatani, Keiji; ; ; ;

PNC TN9410 92-345, 166 Pages, 1992/10

PNC-TN9410-92-345.pdf:3.92MB

An evaluation about the radioactive corrosion product (CP) behaviour in sodium cooling systems of a fast reactor is presented in this report, based on the obtained measurement results in the operating experience of JOYO. The objective of this work is to update the calculational model for predicting the release and deposition behaviour of CP in primary sodium cooling systems of a fast reactor. The evaluation results are as follows; (1)The main radionuclides of CPs transported to the out-of-reactor primary sodium loop are $^{54}$ Mn and $^{60}$ Co, and $^{54}$ Mn is the most dominant. On the other hand, $^{60}$ Co is the most dominant nuclide found in the liquid waste from spent fuel cleaning, which is produced by removal of activated CP deposits from surfaces of core sub-assemblies in sodium cleaning. (2)The deposition rate of $^{54}$ Mn onto the hot-leg (HL) piping walls corresponds fairly with the saturation of radioactivity induced in core materials by activation, on the other hand, that onto the cold-leg (CL) piping walls has been being accelerated. The deposition rate of $^{60}$ Co, due to the dependency of activation and release in a core, is strongly affected by the re-fuelling pattern and the oxygen concentration in sodium, and suggests the detouching process of deposits from wall surfaces. (3)Although $^{54}$ Mn was transported and deposited preferentially in the HL of the primary cooling system in an early stage, the transport and deposition in the CL regions has overcomed that in the HL along operating time. $^{60}$ Co was transported and deposited preferentially in the HL and the similar distribution pattern has been maintained thoroughout the operating periods. (4)The solution - precipitation model for CP behaviour in flowing sodium system was verified via the sensitivity test of model parameters and optimizing them on the above mentioned results, giving the measured to caluculated values of 1.36 or 1.03 for $^{54}$ Mn or $^{60}$ Co buildup, and 1.61 ...