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Journal Articles

Machine learning molecular dynamics simulations toward exploration of high-temperature properties of nuclear fuel materials; Case study of thorium dioxide

Kobayashi, Keita; Okumura, Masahiko; Nakamura, Hiroki; Itakura, Mitsuhiro; Machida, Masahiko; Cooper, M. W. D.*

Scientific Reports (Internet), 12(1), p.9808_1 - 9808_11, 2022/06

no abstracts in English

Journal Articles

Construction of machine-learning Zr interatomic potentials for identifying the formation process of c-type dislocation loops

Okita, Taira*; Terayama, Satoshi*; Tsugawa, Kiyoto*; Kobayashi, Keita; Okumura, Masahiko; Itakura, Mitsuhiro; Suzuki, Katsuyuki*

Computational Materials Science, 202, p.110865_1 - 110865_9, 2022/02

Journal Articles

Autoradiography system with phosphor powder (ZnS:Ag) for imaging radioisotope dynamics in a living plant

Kurita, Keisuke; Sakai, Takuro; Suzui, Nobuo*; Yin, Y.-G.*; Sugita, Ryohei*; Kobayashi, Natsuko*; Tanoi, Keitaro*; Kawachi, Naoki*

Japanese Journal of Applied Physics, 60(11), p.116501_1 - 116501_4, 2021/11

Radioisotope tracer imaging is useful for studying plant physiological phenomena. In this study, we developed an autoradiography system with phosphor powder (ZnS:Ag), "Live-autoradiography", for imaging radioisotope dynamics in a living plant. This system visualizes the element migration and accumulation in intact plants continuously under a light environment. An imaging test was performed on point sources of $$^{137}$$Cs, with a radioactivity of 10-100 kBq of being observed; this indicates satisfactory system linearity between the image intensity and the radioactivity of $$^{137}$$Cs. Moreover, dynamics imaging of $$^{137}$$Cs was performed on an intact soybean plant for four days. The serial images indicated $$^{137}$$Cs accumulation in the node, vein, and growing point of the plant. The developed system can be used for studying plant physiological phenomena and can be employed for quantitative measurement of radionuclides.

Journal Articles

Hydration structures of barium ions; ${it Ab initio}$ molecular dynamics simulations using the SCAN meta-GGA density functional and EXAFS spectroscopy studies

Yamaguchi, Akiko; Kobayashi, Keita; Takahashi, Yoshio*; Machida, Masahiko; Okumura, Masahiko

Chemical Physics Letters, 780, p.138945_1 - 138945_5, 2021/10

 Times Cited Count:0 Percentile:0.01(Chemistry, Physical)

no abstracts in English

Journal Articles

Self-learning hybrid Monte Carlo method for isothermal-isobaric ensemble; Application to liquid silica

Kobayashi, Keita; Nagai, Yuki; Itakura, Mitsuhiro; Shiga, Motoyuki

Journal of Chemical Physics, 155(3), p.034106_1 - 034106_9, 2021/07

 Times Cited Count:0 Percentile:0.01(Chemistry, Physical)

no abstracts in English

Journal Articles

Machine learning potentials for tobermorite minerals

Kobayashi, Keita; Nakamura, Hiroki; Yamaguchi, Akiko; Itakura, Mitsuhiro; Machida, Masahiko; Okumura, Masahiko

Computational Materials Science, 188, p.110173_1 - 110173_14, 2021/02

 Times Cited Count:0 Percentile:0(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Self-learning hybrid Monte Carlo; A First-principles approach

Nagai, Yuki; Okumura, Masahiko; Kobayashi, Keita*; Shiga, Motoyuki

Physical Review B, 102(4), p.041124_1 - 041124_6, 2020/07

 Times Cited Count:2 Percentile:44.66(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Superconductivity in repulsively interacting fermions on a diamond chain; Flat-band-induced pairing

Kobayashi, Keita*; Okumura, Masahiko; Yamada, Susumu; Machida, Masahiko; Aoki, Hideo*

Physical Review B, 94(21), p.214501_1 - 214501_7, 2016/12

 Times Cited Count:38 Percentile:88.59(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Development of a high power wideband polarizer for electron cyclotron current drive system in JT-60SA

Saigusa, Mikio*; Oyama, Gaku*; Matsubara, Fumiaki*; Takii, Keita*; Sai, Takuma*; Kobayashi, Takayuki; Moriyama, Shinichi

Fusion Engineering and Design, 96-97, p.577 - 582, 2015/10

 Times Cited Count:4 Percentile:32.14(Nuclear Science & Technology)

A wideband polarizer has been developed for an ECCD system in JT-60SA. The groove depth of the mirrors installed in miter bends were optimized for two frequencies (110 GHz and 138 GHz) by numerical simulations. All surfaces of Poincare spheres were covered at both of the frequencies in low power test. The thermal stress of polarizer were estimated by the numerical simulations. The twister polarizer has been tested up to 0.24 MW during 3 s at 110 GHz.

Journal Articles

Ferromagnetism in multi-orbital Fermi gas loaded on a one-dimensional optical lattice

Kobayashi, Keita; Okumura, Masahiko; Ota, Yukihiro*; Yamada, Susumu; Machida, Masahiko

JPS Conference Proceedings (Internet), 3, p.016006_1 - 016006_6, 2014/06

no abstracts in English

Journal Articles

Quantum phases in degenerate-$$p$$-orbital attractive one-dimensional fermionic optical lattices

Kobayashi, Keita; Ota, Yukihiro; Okumura, Masahiko; Yamada, Susumu; Machida, Masahiko

Physical Review A, 89(2), p.023625_1 - 023625_6, 2014/02

 Times Cited Count:8 Percentile:47.84(Optics)

no abstracts in English

Journal Articles

Massless collective excitations in frustrated multiband superconductors

Kobayashi, Keita; Machida, Masahiko; Ota, Yukihiro*; Nori, F.*

Physical Review B, 88(22), p.224516_1 - 224516_5, 2013/12

 Times Cited Count:16 Percentile:62.34(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Analysis of collective excitation for multi band superconductor; Frustrated spin model approach

Kobayashi, Keita; Ota, Yukihiro*; Machida, Masahiko

Physica C, 494, p.13 - 16, 2013/11

 Times Cited Count:4 Percentile:23.31(Physics, Applied)

no abstracts in English

Journal Articles

Quantum phases in intrinsic Josephson junctions; Quantum magnetism analogy

Machida, Masahiko; Kobayashi, Keita; Koyama, Tomio*

Physica C, 491, p.44 - 46, 2013/08

 Times Cited Count:1 Percentile:5.74(Physics, Applied)

no abstracts in English

Journal Articles

Nontrivial Haldane phase of an atomic two-component Fermi gas trapped in a 1D optical lattice

Kobayashi, Keita; Okumura, Masahiko; Ota, Yukihiro*; Yamada, Susumu; Machida, Masahiko

Physical Review Letters, 109(23), p.235302_1 - 235302_5, 2012/12

 Times Cited Count:22 Percentile:75.43(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Effect of sweep gas species on tritium release behavior from lithium titanate packed bed during 14MeV neutron irradiation

Kawamura, Yoshinori; Ochiai, Kentaro; Hoshino, Tsuyoshi; Kondo, Keitaro*; Iwai, Yasunori; Kobayashi, Kazuhiro; Nakamichi, Masaru; Konno, Chikara; Yamanishi, Toshihiko; Hayashi, Takumi; et al.

Fusion Engineering and Design, 87(7-8), p.1253 - 1257, 2012/08

 Times Cited Count:15 Percentile:78.3(Nuclear Science & Technology)

Tritium generation and recovery study on lithium ceramic packed bed was started by use of FNS in JAEA. Lithium titanate was selected as tritium breeding material. In this work, the effect of sweep gas species on tritium release behavior was investigated. In case of sweep by helium with 1% of hydrogen, tritium in water form was released sensitively corresponding to the irradiation. This is due to existence of the water vapor in the sweep gas. On the other hand, in case of sweep by dry helium, tritium in gaseous form was released first, and release of tritium in water form was delayed and was gradually increased.

Journal Articles

Direct numerical simulation for non-equilibrium transport phenomena in superconducting detectors

Ota, Yukihiro*; Kobayashi, Keita; Machida, Masahiko; Koyama, Tomio*; Nori, F.*

Physics Procedia, 27, p.352 - 355, 2012/00

 Times Cited Count:2 Percentile:66.99

no abstracts in English

Journal Articles

Effects of locally targeted heavy-ion and laser microbeam on root hydrotropism in ${it Arabidopsis thaliana}$

Miyazawa, Yutaka*; Sakashita, Tetsuya; Funayama, Tomoo; Hamada, Nobuyuki*; Negishi, Hiroshi*; Kobayashi, Akie*; Kaneyasu, Tomoko*; Oba, Atsushi*; Morohashi, Keita*; Kakizaki, Takehiko*; et al.

Journal of Radiation Research, 49(4), p.373 - 379, 2008/07

 Times Cited Count:24 Percentile:62.01(Biology)

We examined the role of root cap and elongation zone cells in root hydrotropism using heavy-ion and laser microbeam. Heavy-ion microbeam irradiation of the elongation zone, but not that of the columella cells, significantly and temporary suppressed the development of hydrotropic curvature. However, laser ablation confirmed that columella cells are indispensable for hydrotropism. Systemic heavy-ion broad-beam irradiation suppressed ${it de novo}$ expression of ${it INDOLE ACETIC ACID 5}$ gene, but not ${it MIZU-KUSSEI1}$ gene. Our results indicate that both the root cap and elongation zone have indispensable and functionally distinct roles in root hydrotropism, and that ${it de novo}$ gene expression might be required for hydrotropism in the elongation zone, but not in columella cells.

Journal Articles

Quantum field theoretical analysis on dynamical instability of Bose-Einstein condensates in optical lattices

Kobayashi, Keita*; Mine, Makoto*; Okumura, Masahiko; Yamanaka, Yoshiya*

Soryushiron Kenkyu, 116(2), p.B64 - B66, 2008/06

no abstracts in English

Journal Articles

Functional analysis of root elongation zone in hydrotropism in ${it Arabidopsis}$ using heavy-ion microbeam

Miyazawa, Yutaka*; Sakashita, Tetsuya; Negishi, Hiroshi*; Kobayashi, Akie*; Kaneyasu, Tomoko*; Oba, Atsushi*; Morohashi, Keita*; Kakizaki, Takehiko*; Funayama, Tomoo; Hamada, Nobuyuki*; et al.

JAEA-Review 2007-060, JAEA Takasaki Annual Report 2006, P. 116, 2008/03

We examined the role of root cap and elongation zone cells in root hydrotropism of ${it Arabidopsis thaliana}$ using heavy ion and laser microbeam. Heavy ion microbeam irradiation of the elongation zone, but not that of the columella cells, significantly and temporarily suppressed the development of hydrotropic curvature. However, laser ablation confirmed that columella cells are indispensable for hydrotropism. Systemic heavy ion broad beam irradiation suppressed de novo expression of INDOLE ACETIC ACID 5 gene. Our results indicate that both the root cap and elongation zone have indispensable and functionally distinct roles in root hydrotropism, and that de novo gene expression might be required for hydrotropism in the elongation zone, but not in columella cells.

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