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Kumagai, Masayoshi*; Uchida, Tomohiro*; Murasawa, Kodai*; Takamura, Masato*; Ikeda, Yoshimasa*; Suzuki, Hiroshi; Otake, Yoshie*; Hama, Takayuki*; Suzuki, Shinsuke*
Materials Research Proceedings, Vol.6, p.57 - 62, 2018/10
Times Cited Count：0 Percentile：0.18(Metallurgy & Metallurgical Engineering)Murasawa, Kodai*; Takamura, Masato*; Kumagai, Masayoshi*; Ikeda, Yoshimasa*; Suzuki, Hiroshi; Otake, Yoshie*; Hama, Takayuki*; Suzuki, Shinsuke*
Materials Transactions, 59(7), p.1135 - 1141, 2018/07
Times Cited Count：7 Percentile：36.72(Materials Science, Multidisciplinary)Sunaga, Hideyuki*; Takamura, Masato*; Ikeda, Yoshimasa*; Otake, Yoshie*; Hama, Takayuki*; Kumagai, Masayoshi*; Suzuki, Hiroshi; Suzuki, Shinsuke*
Journal of Physics; Conference Series, 734(Part B), p.032027_1 - 032027_4, 2016/09
Times Cited Count：0 Percentile：0.03(Physics, Applied)A neutron diffraction measurement was performed to reveal microstructural aspects of the ductile fracture in ferritic steel. The diffraction patterns were continuously measured at the center of the reduced area while a tensile specimen was loaded under tension until the end of the fracture process. The measurement results showed that the volume fraction of (110)-oriented grains increased when the texture evolved as a result of plastic deformation. But the mechanism of texture evolution may be changed during necking, decreasing an increase rate of the volume fraction.
Takamura, Masato*; Ikeda, Yoshimasa*; Sunaga, Hideyuki*; Taketani, Atsushi*; Otake, Yoshie*; Suzuki, Hiroshi; Kumagai, Masayoshi*; Hama, Takayuki*; Oba, Yojiro*
Journal of Physics; Conference Series, 734(Part B), p.032047_1 - 032047_4, 2016/08
Times Cited Count：5 Percentile：86.44(Physics, Applied)Neutron diffraction is well known to be a useful technique for measuring a bulk texture of metallic materials taking advantage of a large penetration depth of the neutron beam. However, this technique has not been widely utilized for the texture measurement because large facilities like a reactor or a large accelerator are required in general. In contrast, RANS (Riken Accelerator-driven Compact Neutron Source) has been developed as a neutron source which can be used easily in laboratories. In this study, texture evolution in steel sheets with plastic deformation was successfully measured using RANS. The results show the capability of the compact neutron source for the analysis of the crystal structure of metallic materials, which leads us to a better understanding of plastic deformation behavior.
Shiraki, Fumiya*; Yoshikawa, Taeko*; Oshima, Akihiro*; Oshima, Yuji*; Takasawa, Yuya*; Fukutake, Naoyuki*; Oyama, Tomoko*; Urakawa, Tatsuya*; Fujita, Hajime*; Takahashi, Tomohiro*; et al.
Nuclear Instruments and Methods in Physics Research B, 269(15), p.1777 - 1781, 2011/08
Times Cited Count：8 Percentile：53.37(Instruments & Instrumentation)The graded energy deposition of heavy ion beam irradiation to polymeric materials was utilized to synthesize a novel proton exchange membrane (PEM) with the graded density of sulfonic acid groups toward the thickness direction. Stacked Poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) films were irradiated by Xe
ion beam with the energy of 6 MeV/u under a vacuum condition. Irradiated films were grafted with styrene monomer and then sulfonated. The membrane electrode assembly (MEA) fabricated by the function graded PEM showed improved fuel cell performance in terms of voltage stability. It was expected that the function-graded PEM could control the graded concentration of sulfonic acid groups in PEM.
Gowa, Tomoko*; Shiotsu, Tomoyuki*; Urakawa, Tatsuya*; Oka, Toshitaka; Murakami, Takeshi*; Oshima, Akihiro*; Hama, Yoshimasa*; Washio, Masakazu*
Radiation Physics and Chemistry, 80(2), p.264 - 267, 2011/02
Times Cited Count：8 Percentile：53.37(Chemistry, Physical)High linear energy transfer (LET) heavy ion beams were irradiated to poly(tetrafluoroethylene-co-ethylene) (ETFE) under vacuum and in air. The irradiation effects in ETFE as a function of the depth was precisely evaluated by analyzing each one of the films of the irradiation samples which were made of stacked ETFE films. It was indicated that conjugated double bonds would be generated by heavy ion beam irradiation, and their amounts should show the Bragg-curve-like distributions. Also, it was suggested that higher LET beams would induce radical formation in high density and longer conjugated C=C double bonds could be generated by the second-order reactions. Moreover, for irradiation samples in air, C=O was produced correlating to the yield of oxygen molecules diffusing from the sample surface.
Oka, Toshitaka; Oshima, Akihiro*; Motohashi, Ryota*; Seto, Naoto*; Watanabe, Yuji*; Kobayashi, Ryoji*; Saito, Koki*; Kudo, Hisaaki*; Murakami, Takeshi*; Washio, Masakazu*; et al.
Radiation Physics and Chemistry, 80(2), p.278 - 280, 2011/02
Times Cited Count：7 Percentile：48.91(Chemistry, Physical)The chemical structures of various ion-beam irradiated isotactic-polypropylene samples were studied. Results of micro-Fourier transform infrared spectroscopy and ultraviolet-visible spectroscopy suggest not only the linear energy transfer, but also the fluence is effective in local transformation of the isotactic-polypropylene.
Sugimoto, Masaki; Kudo, Hisaaki; Sasuga, Tsuneo; Seguchi, Tadao; Hama, Yoshimasa*; Hamanaka, Kenichi*; Matsumoto, Hideya*
JAERI-Conf 97-003, p.269 - 272, 1997/03
no abstracts in English
Hama, Yoshimasa*; *; Matsumoto, Hideya*; *; Kudo, Hisaaki; Sugimoto, Masaki; Seguchi, Tadao
Radiation Physics and Chemistry, 48(5), p.549 - 554, 1996/00
Times Cited Count：18 Percentile：80.29(Chemistry, Physical)no abstracts in English
11, 1994, Waseda University, Tokyo, JapanHama, Yoshimasa*; Katsumura, Yosuke*; *; Makuuchi, Keizo
JAERI-Conf 95-003, 630 Pages, 1995/03
no abstracts in English
Hama, Yoshimasa*; *; Hamanaka, Kenichi*; Matsumoto, Hideya*; Kudo, Hisaaki; Sasuga, Tsuneo; Seguchi, Tadao; *
Proceedings of of the Yayoi Symposium on Ion-Beam Radiation Chemistry; NIRS-M-101, HIMAC-007, 0, p.9 - 12, 1994/00
no abstracts in English
Matsumoto, Hideya*; *; Hama, Yoshimasa*; Kudo, Hisaaki; Sasuga, Tsuneo; Seguchi, Tadao
DEI-93-153, 0(0), p.1 - 8, 1993/12
no abstracts in English
*; *; Udagawa, Akira; Sasuga, Tsuneo; Seguchi, Tadao; Hama, Yoshimasa*
Advanced Composite Materials, 1(4), p.321 - 331, 1991/00
no abstracts in English
*; Hama, Yoshimasa*; Sasuga, Tsuneo; Seguchi, Tadao
Polymer, 32(14), p.2499 - 2504, 1991/00
Times Cited Count：19 Percentile：67.41(Polymer Science)no abstracts in English
*; Udagawa, Akira; *; Hama, Yoshimasa*; Seguchi, Tadao
EIM-90-126, p.11 - 18, 1990/12
no abstracts in English
Hama, Yoshimasa*; *; Kusama, Yasuo
EIM-90-44, p.75 - 82, 1990/04
no abstracts in English
*; *; Udagawa, Akira; Sasuga, Tsuneo; Seguchi, Tadao; Hama, Yoshimasa*
EIM-89-120, p.61 - 69, 1989/12
no abstracts in English
*; Sasuga, Tsuneo; Seguchi, Tadao; Hama, Yoshimasa*
EIM-88-132, p.11 - 18, 1988/12
no abstracts in English
Oka, Toshitaka; Oshima, Akihiro*; Motohashi, Ryota*; Seto, Naoto*; Watanabe, Yuji*; Kobayashi, Ryoji*; Kudo, Hisaaki*; Murakami, Takeshi*; Washio, Masakazu*; Hama, Yoshimasa*
no journal, ,
Gowa, Tomoko*; Shiotsu, Tomoyuki*; Urakawa, Tatsuya*; Oka, Toshitaka; Murakami, Takeshi*; Oshima, Akihiro*; Hama, Yoshimasa*; Washio, Masakazu*
no journal, ,
