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Murata, Yoshinori*; Watanabe, Naoya*; Nagae, Yuji
Advances in Materials Technology for Fossil Power Plants; Proceedings from the 8th International Conference (EPRI 2016), p.487 - 494, 2016/00
P
Araki, Shingo*; Hayashida, Minami*; Nishiumi, Naoto*; Manabe, Hiroki*; Ikeda, Yoichi*; Kobayashi, Tatsuo*; Murata, Keizo*; Inada, Yoshihiko*; Wi
niewski, P.*; Aoki, Dai*; et al.
Journal of the Physical Society of Japan, 84(2), p.024705_1 - 024705_8, 2015/02
Times Cited Count：9 Percentile：55.91(Physics, Multidisciplinary)P under high pressureAraki, Shingo*; Hayashida, Minami*; Nishiumi, Naoto*; Manabe, Hiroki*; Ikeda, Yoichi*; Kobayashi, Tatsuo*; Murata, Keizo*; Inada, Yoshihiko*; Winiewski, P.*; Aoki, Dai*; et al.
JPS Conference Proceedings (Internet), 3, p.011081_1 - 011081_6, 2014/06
Iwata, Mitsunao*; Sugiyama, Yuichi*; Murata, Yoshinori*; Takaya, Shigeru
Defect and Diffusion Forum, 326-328, p.578 - 582, 2012/04
Times Cited Count：0 Percentile：0.01(Nanoscience & Nanotechnology)no abstracts in English
collisions at 
= 200 and 62.4 GeVAdare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Armendariz, R.*; et al.
Physical Review C, 83(6), p.064903_1 - 064903_29, 2011/06
Times Cited Count：184 Percentile：99.44(Physics, Nuclear)Transverse momentum distributions and yields for 
, and 
in collisions at = 200 and 62.4 GeV at midrapidity are measured by the PHENIX experiment at the RHIC. We present the inverse slope parameter, mean transverse momentum, and yield per unit rapidity at each energy, and compare them to other measurements at different collisions. We also present the scaling properties such as 
and 
scaling and discuss the mechanism of the particle production in collisions. The measured spectra are compared to next-to-leading order perturbative QCD calculations.
and Au+Au collisions at 
= 200 GeVAdare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Aramaki, Y.*; et al.
Physical Review C, 83(4), p.044912_1 - 044912_16, 2011/04
Times Cited Count：8 Percentile：49.7(Physics, Nuclear)Measurements of electrons from the decay of open-heavy-flavor mesons have shown that the yields are suppressed in Au+Au collisions compared to expectations from binary-scaled collisions. Here we extend these studies to two particle correlations where one particle is an electron from the decay of a heavy flavor meson and the other is a charged hadron from either the decay of the heavy meson or from jet fragmentation. These measurements provide more detailed information about the interaction between heavy quarks and the quark-gluon matter. We find the away-side-jet shape and yield to be modified in Au+Au collisions compared to collisions.
Tsukada, Yuki*; Shiraki, Atsuhiro*; Murata, Yoshinori*; Takaya, Shigeru; Koyama, Toshiyuki*; Morinaga, Masahiko*
Journal of Nuclear Materials, 401(1-3), p.13 - 16, 2010/06
Times Cited Count：4 Percentile：30.63(Materials Science, Multidisciplinary)The correlation of defect energies with precipitation of the ferromagnetic phase near M
C
carbide during creep tests at high temperature in Type 304 austenitic steel was examined by estimating the defect energies near the carbide, based on micromechanics. As one of the defect energies, the precipitation energy was calculated by assuming MC carbide to be a spherical inclusion. The other defect energy, creep dislocation energy, was calculated based on dislocation density data obtained from transmission electron microscopy observations of the creep samples. The dislocation energy density was much higher than the precipitation energy density in the initial stage of the creep process, when the ferromagnetic phase started to increase. Creep dislocation energy could be the main driving force for precipitation of the ferromagnetic phase.
C carbide and ferromagnetic phases during creep deformation in Type 304 steelTsukada, Yuki*; Shiraki, Atsuhiro*; Murata, Yoshinori*; Takaya, Shigeru; Koyama, Toshiyuki*; Morinaga, Masahiko*
Journal of Nuclear Materials, 401(1-3), p.154 - 158, 2010/06
Times Cited Count：6 Percentile：40.28(Materials Science, Multidisciplinary)A phase-field method was applied to the simulation of simultaneous nucleation and growth of both MC carbide and ferromagnetic 
phases during the creep process in Type 304 steel. The defect energy of the creep dislocations near the carbides, which increases during creep, was integrated into the nucleation driving force for the phase. The simulation used in this study accurately reproduced changes in the amounts of the precipitated phases as a function of creep time. Furthermore, we examine the effect of the dislocation density on precipitation of the phase, and show that the phase-field method is useful for examining the stochastic and kinetic phenomenon of phase transformation.
Wada, Atsushi*; Watanabe, Masayuki; Yamanoi, Yoshinori*; Nankawa, Takuya; Namiki, Kosuke*; Yamasaki, Mikio*; Murata, Masaki*; Nishihara, Hiroshi*
Bulletin of the Chemical Society of Japan, 80(2), p.335 - 345, 2007/02
Times Cited Count：22 Percentile：57.38(Chemistry, Multidisciplinary)Lanthanide complexes with linear and cyclic octadentate oligopyridine-amine ligands were synthesized, and their molecular structures were determined by single-crystal X-ray crystallography. All of the complexes had a distorted capped square antiprism (CSAP) geometry, and the coordination environments of lanthanide complexes were more distortedfor the complexes with the linear ligand than those with the cyclic ligand. The Eu
complexes with the linear ligand showed more intense emissions, which were attributed to the 
D
F
transition, than the complex withthe cyclic ligand in acetonitrile, which can be attributed to the distortion in the coordination environments. These results indicate that the coordination environments of lanthanide complexes, and thus the luminescence properties, can be controlled by tuning the geometrical structures of polydentate ligands.
Okubo, Tadatsune*; Tsukuda, Yoshiaki*; Kamimura, Katsuichiro*; Murai, Kenji*; Goto, Ken*; Doi, Soichi*; Senda, Yasuhide*; Kosaka, Yuji*; Kido, Toshiya*; Murata, Tamotsu*; et al.
Nihon Genshiryoku Gakkai-Shi, 43(9), p.906 - 915, 2001/09
Times Cited Count：0 Percentile：0.01(Nuclear Science & Technology)no abstracts in English
Morinaga, Masahiko*; Saito, Junichi*; Murata, Yoshinori*; Kano, Shigeki; *; Tachi, Yoshiaki; Inoue, Satoshi*
PNC TY9623 95-001, 165 Pages, 1995/03
None
Wada, Atsushi; Watanabe, Masayuki; Yamanoi, Yoshinori*; Murata, Masaki*; Nishihara, Hiroshi*
no journal, ,
Lanthanide complexes with linear and cyclic octadentate oligopyridine-amine ligands were newly synthesized, and their molecular structures were determined by single-crystal X-ray crystallography. All of the complexes formed with the distorted CSAP geometry, the symmetry of which was higher for the complexes with the cyclic ligand than those with the linear ligand. The Eu and Tb complexes showed intense luminescence due to energy transfer from the ligand to the metal center (antenna effect). The Eu complexes with the linear ligand showed more intense emissions attributed to the 5D07F2 transition than the complex with the cyclic ligand, which can be explained by the decrease in symmetry around the lanthanide ion. The coordination of water molecules to Eu and Tb ions was strongly inhibited by surrounding the metal ions with the cyclic ligand, resulting in an appearance of intense luminescence in water. These results indicate that the symmetry and stability of lanthanide complexes, and thus the luminescence properties, can be successfully controlled by tuning the geometrical structures of multi-dentate ligands.
Murata, Yoshinori*; Kunieda, Tomonori*; Nakaya, Ippei*; Morinaga, Masahiko*; Takaya, Shigeru
no journal, ,
no abstracts in English
Shiraki, Atsuhiro*; Wada, Takumi*; Murata, Yoshinori*; Morinaga, Masahiko*; Takaya, Shigeru; Koyama, Toshiyuki*
no journal, ,
no abstracts in English
Tsukada, Yuki*; Shiraki, Atsuhiro*; Murata, Yoshinori*; Morinaga, Masahiko*; Takaya, Shigeru; Koyama, Toshiyuki*
no journal, ,
no abstracts in English
Shiraki, Atsuhiro*; Tsukada, Yuki*; Murata, Yoshinori*; Morinaga, Masahiko*; Takaya, Shigeru; Koyama, Toshiyuki*
no journal, ,
This study demonstrates the mechanism of 
transformation in creep test on the basis of the energy of the system. The experimental result shows that the strain energy around MC carbide becomes very high due to dislocations stored during creep. As a result, the system free energy in the local region near the carbide increases with increasing creep time but it decreases by the formation of ferromagnetic phase.
Shiraki, Atsuhiro*; Tsukada, Yuki*; Murata, Yoshinori*; Morinaga, Masahiko*; Takaya, Shigeru; Koyama, Toshiyuki*
no journal, ,
We evaluated the system free energy of SUS304 for understanding the phenomenon that ferromagnetic phase is formed in austenitic stainless steel during creep test. As result, it was thought that there are regions with high system free energy due to increase in strain energy locally, where ferromagnetic phase may be formed.
Murata, Yoshinori*; Shiraki, Atsuhiro*; Takeda, Kotaro*; Tsukada, Yuki*; Saito, Yoshihiro*; Morinaga, Masahiko*; Koyama, Toshiyuki*; Takaya, Shigeru
no journal, ,
no abstracts in English
carbide in SUS304 austenitic steelShiraki, Atsuhiro*; Tsukada, Yuki*; Murata, Yoshinori*; Morinaga, Masahiko*; Takaya, Shigeru; Koyama, Toshiyuki*
no journal, ,
Authors have shown that ferromagnetic phases are induced in SUS304 by strain concentration during creep test. In this paper, we simulate the formation of 
carbide which is important as trapping site of dislocation by using the phase-field method.
Tsukada, Yuki*; Shiraki, Atsuhiro*; Murata, Yoshinori*; Morinaga, Masahiko*; Takaya, Shigeru; Koyama, Toshiyuki*
no journal, ,
The formation of the ferromagnetic phase during creep deformation in SUS304 steel was simulated by aphase-field method. In order to consider the precipitation and growth of the phase simultaneously, we haveconstructed a model based on experimental results. In this model, strain energy stored near carbideduring creep deformation increases the driving force for precipitation of the phase. This strain energy isestimated on the basis of distribution function of dislocation density in space near the carbide and is used inthe calculation of the activation energy for nucleation of the phase. Changes in mole fraction of both carbide and the phase are reproduced well in this simulation. Furthermore, it is found that theincrease rate of dislocation density during creep process affects the manner of the change in mole fraction ofthe phase.
