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Search Results: Records 1-20 displayed on this page of 25

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Journal Articles

Large trigonal-field effect on spin-orbit coupled states in a pyrochlore iridate

Uematsu, Daisuke*; Sagayama, Hajime*; Arima, Takahisa*; Ishikawa, Jun*; Nakatsuji, Satoru*; Takagi, Hidenori*; Yoshida, Masahiro*; Mizuki, Junichiro; Ishii, Kenji

Physical Review B, 92(9), p.094405_1 - 094405_6, 2015/09

https://doi.org/10.1103/PhysRevB.92.094405

Times Cited Count：22 Percentile：66.77(Materials Science, Multidisciplinary)

Journal Articles

Spin-orbit coupling induced semi-metallic state in the 1/3 hole-doped hyper-kagome NaIrO

Takayama, Tomohiro*; Yaresko, A.*; Matsumoto, Akiyo*; Nuss, J.*; Ishii, Kenji; Yoshida, Masahiro*; Mizuki, Junichiro; Takagi, Hidenori*

Scientific Reports (Internet), 4, p.6818_1 - 6818_6, 2014/10

https://doi.org/10.1038/srep06818

Times Cited Count：31 Percentile：81.59(Multidisciplinary Sciences)

Journal Articles

Verification and validation procedures of calculation codes for determining corrosive conditions in the BWR primary cooling system based on water radiolysis and mixed potential models

Uchida, Shunsuke*; Wada, Yoichi*; Yamamoto, Seiji*; Takagi, Junichi*; Hisamune, Kenji*

Journal of Nuclear Science and Technology, 51(1), p.24 - 36, 2014/01

https://doi.org/10.1080/00223131.2013.842945

Times Cited Count：9 Percentile：57.19(Nuclear Science & Technology)

ECP in the BWR primary cooling system can be measured only in the restricted region. In order to determine ECP at any location, ECP should be evaluated by computer simulation codes consisting of water radiolysis models to determine the concentrations of corrosive radiolytic species and mixed potential models to determine ECP based on corrosive species. Mitigation of SCC crack growth rate due to decreasing ECP can be authorized by the JSME Standards, while mitigation of ECP due to hydrogen addition has not been authorized yet. In the paper, standard procedures to authorize the computer simulation codes based on the verification and validation method are proposed. The numerical justification of every code applied as a standard code should be verified and its accuracy and applicability for plant analysis should be validated. Benchmark problems for verification processes are proposed and comparison of the calculated results with the measured ones for the plant of evaluation is required.

Journal Articles

Momentum-resolved electronic excitations in the Mott insulator SrIrO studied by resonant inelastic X-ray scattering

Ishii, Kenji; Jarrige, I.; Yoshida, Masahiro; Ikeuchi, Kazuhiko*; Mizuki, Junichiro; Ohashi, Kei*; Takayama, Tomohiro*; Matsuno, Jobu*; Takagi, Hidenori*

Physical Review B, 83(11), p.115121_1 - 115121_5, 2011/03

https://doi.org/10.1103/PhysRevB.83.115121

Times Cited Count：71 Percentile：90.97(Materials Science, Multidisciplinary)

Journal Articles

Anomalous metallic state in the vicinity of metal to valence-bond solid insulator transition in LiVS $_{2}$

Katayama, Naoyuki*; Uchida, Masaya*; Hashizume, Daisuke*; Niitaka, Seiji*; Matsuno, Jobu*; Matsumura, Daiju; Nishihata, Yasuo; Mizuki, Junichiro; Takeshita, Nao*; Gauzzi, A.*; et al.

Physical Review Letters, 103(14), p.146405_1 - 146405_4, 2009/10

https://doi.org/10.1103/PhysRevLett.103.146405

Times Cited Count：59 Percentile：88.48(Physics, Multidisciplinary)

We investigate LiVS $_{2}$ and LiVSe $_{2}$ with a triangular lattice as itinerant analogues of LiVO $_{2}$ known for the formation of a valence-bond solid (VBS) state out of an S = 1 frustrated magnet. LiVS $_{2}$ , which is located at the border between a metal and a correlated insulator, shows a first order transition from a paramagnetic metal to a VBS insulator at T $_{c}$ 305 K upon cooling. The presence of a VBS state in the close vicinity of insulator-metal transition may suggest the importance of itinerancy in the formation of a VBS state. We argue that the high temperature metallic phase of LiVS $_{2}$ has a pseudogap, likely originating from the VBS fluctuation. LiVSe $_{2}$ was found to be a paramagnetic metal down to 2 K.

Journal Articles

Local structure anomaly around Ge dopants in Mn $_{3}$ Cu $_{0.7}$ Ge $_{0.3}$ N with negative thermal expansion

Matsuno, Jobu*; Takenaka, Koshi*; Takagi, Hidenori*; Matsumura, Daiju; Nishihata, Yasuo; Mizuki, Junichiro

Applied Physics Letters, 94(18), p.181904_1 - 181904_3, 2009/05

https://doi.org/10.1063/1.3129169

Times Cited Count：45 Percentile：82.5(Physics, Applied)

Local structure analysis of Cu and Ge atoms in the negative thermal expansion material Mn $_{3}$ Cu $_{0.7}$ Ge $_{0.3}$ N was conducted using X-ray absorption fine structure measurements. The temperature dependence of the interatomic distance was found to reflect the macroscopic negative thermal expansion both for Cu-Mn and Ge-Mn shells, although the magnitude of the relative change was much larger for Ge-Mn than Cu-Mn. An enhanced anomaly of the Debye-Waller factor was observed for the Ge-Mn shell in the temperature region of the negative expansion, indicating the presence of static local disorder around Ge impurities. These local structure anomalies strongly suggest that the local and inhomogeneous strain around Ge is essential in broadening the discontinuous volume contraction.

Journal Articles

Key interactions in integrin ectodomain responsible for global conformational change detected by elastic network normal-mode analysis

Matsumoto, Atsushi; Kamata, Tetsuji*; Takagi, Junichi*; Iwasaki, Kenji*; Yura, Kei

Biophysical Journal, 95(6), p.2895 - 2908, 2008/09

https://doi.org/10.1529/biophysj.108.131045

Times Cited Count：19 Percentile：44.72(Biophysics)

Protein is activated, but the activation mechanism and generality of the conformational change remain to be elucidated. We performed normal mode analysis of the elastic network model on integrin $_{V}$ $_{3}$ ectodomain in the bent form and identified key residues which were influential on molecular motions. Iterative normal mode calculations demonstrated that the specific non-bonded interactions involving the key residues work as a snap to keep integrin in the bent form. The importance of the key residues for the conformational change was further verified by mutation experiments. Conservation pattern of amino acid residues among integrin family showed that the characteristic pattern of residues seen around these key residues is found in the limited groups of integrin chains.

Journal Articles

Current status of the control system for J-PARC accelerator complex

Yoshikawa, Hiroshi; Sakaki, Hironao; Sako, Hiroyuki; Takahashi, Hiroki; Shen, G.; Kato, Yuko; Ito, Yuichi; Ikeda, Hiroshi*; Ishiyama, Tatsuya*; Tsuchiya, Hitoshi*; et al.

Proceedings of International Conference on Accelerator and Large Experimental Physics Control Systems (ICALEPCS '07) (CD-ROM), p.62 - 64, 2007/10

J-PARC is a large scale facility of the proton accelerators for the multi-purpose of scientific researches in Japan. This facility consists of three accelerators and three experimental stations. Now, J-PARC is under construction, and LINAC is operated for one year, 3GeV synchrotron has just started the commissioning in this October the 1st. The completion of this facility will be next summer. The control system of accelerators established fundamental performance for the initial commissioning. The most important requirement to the control system of this facility is to minimize the activation of accelerator devices. In this paper, we show that the performances of each layer of this control system have been achieved in the initial stage.

Journal Articles

Systematic calibration of beam position monitor at J-PARC LINAC

Sato, Susumu; Tomisawa, Tetsuo; Hiroki, Fumio; Lee, S.*; Igarashi, Zenei*; Ikegami, Masanori*; Ueno, Akira; Kondo, Yasuhiro; Hasegawa, Kazuo; Toyama, Takeshi*; et al.

Proceedings of 1st Annual Meeting of Particle Accelerator Society of Japan and 29th Linear Accelerator Meeting in Japan, p.467 - 469, 2004/08

As a joint project of KEK and JAERI, a MW class of high intensity proton accelerator (J-PARC), consisting of Linac, 3 GeV-RCS, 50 GeV-MR, is under construction. For this accelerator, it is required to minimize the beam loss (typically, lower than0.11 W/m at the linac). To achieve the requirement, beam trajectory needs to be controlled with accuracy of some 100 m. The first stage of the acceleration (up to 181 MeV during the first stage of construction) is done by linac. The beam position monitor (BPM) in the linac utilizes 4 stripline pickups (50 ohm) on the beam transportation chamber. In this paper, systematic calibration of the BPM is described.

Oral presentation

Snap residues for integrin activation identified by elastic network normal mode analysis

Matsumoto, Atsushi; Kamata, Tetsuji*; Iwasaki, Kenji*; Takagi, Junichi*; Yura, Kei

no journal, ,

Integrin, a membrane protein with a huge extracellular domain, participates in cell-cell and cell-extracellular matrix interactions for metazoan. A group of integrins are known to perform a large-scale structural change when they are activated, but their mechanism and generality of the conformational change in other integrins remain to be elucidated. We performed normal mode analysis based on the elastic network models of integrin in the bent form to identify key residues dominating the molecular motions toward activation. We simulated the large conformational change of integrin from the bent to the extended forms by iterative normal mode calculations and demonstrated that specific non-bonded interactions involving the key residues work as a snap to lock integrin in the bent form. The importance of the key residues for the conformational change was verified by mutation experiments.

Oral presentation

Deuterium retention in tungsten with radiation damage

Fukumoto, Masakatsu*; Yamawaki, Akifumi*; Soga, Yukihiro*; Otsuka, Yusuke*; Ueda, Yoshio*; Taniguchi, Masaki; Inoue, Takashi; Sakamoto, Keishi; Yagyu, Junichi; Arai, Takashi; et al.

no journal, ,

no abstracts in English

Oral presentation

Deuterium accumulations in damaged tungsten

Fukumoto, Masakatsu*; Yamawaki, Akifumi*; Otsuka, Yusuke*; Ueda, Yoshio*; Taniguchi, Masaki; Inoue, Takashi; Sakamoto, Keishi; Yagyu, Junichi; Arai, Takashi; Takagi, Ikuji*; et al.

no journal, ,

Tungsten is considered as a candidate material for first wall armor of DT fusion reactors. However, it is anticipated that tritium might accumulate in the damage defects that caused by neutron irradiation. The present study measured deuterim accumulation in tungsten specimen after high energy hydrogen ion beam irradiation for generation of irradiation damages and then low energy deuterium beams for their accumulation. As a result, the deuterium accumulation in irradiated tungsten was enhanced as high as six times than that of original specimen.

Oral presentation

Electronic excitations of SrIrO by RIXS

Ishii, Kenji; Jarrige, I.; Yoshida, Masahiro; Ikeuchi, Kazuhiko*; Mizuki, Junichiro; Ohashi, Kei*; Takayama, Tomohiro*; Matsuno, Jobu*; Takagi, Hidenori*

no journal, ,

no abstracts in English

Oral presentation