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Hirata, Yoshinobu*; Nakagawa, Hiroshi; Yamauchi, Hiroki; Kaneko, Koji; Hagihara, Masato; Yamaguchi, Hideyuki*; Omoto, Chie*; Katsuno, Nakako*; Imaizumi, Teppei*; Nishizu, Takahisa*
Food Hydrocolloids, 141, p.108728_1 - 108728_7, 2023/08
Crystallinity is reflected in the mechanical properties of foods and materials. Crystallinity should be related to the structural dynamics of starch. In this study, we used quasi-elastic neutron scattering (QENS) to investigate changes in the molecular dynamics of cooked rice starch during retrogradation. The width of the measured QENS narrowed with retrogradation. The elastic incoherent structure factor (EISF) increased, which indicated that the molecular dynamics are spatially suppressed upon retrogradation. Analysis of EISF with a bimodal continuous diffusion model, where low and high mobilities are assumed to correspond to crystalline and amorphous phases, respectively, showed that the fraction of the low-mobility component increases with retrogradation.
Takeda, Tetsuaki*; Inagaki, Yoshiyuki; Aihara, Jun; Aoki, Takeshi; Fujiwara, Yusuke; Fukaya, Yuji; Goto, Minoru; Ho, H. Q.; Iigaki, Kazuhiko; Imai, Yoshiyuki; et al.
High Temperature Gas-Cooled Reactors; JSME Series in Thermal and Nuclear Power Generation, Vol.5, 464 Pages, 2021/02
As a general overview of the research and development of a High Temperature Gas-cooled Reactor (HTGR) in JAEA, this book describes the achievements by the High Temperature Engineering Test Reactor (HTTR) on the designs, key component technologies such as fuel, reactor internals, high temperature components, etc., and operational experience such as rise-to-power tests, high temperature operation at 950
C, safety demonstration tests, etc. In addition, based on the knowledge of the HTTR, the development of designs and component technologies such as high performance fuel, helium gas turbine and hydrogen production by IS process for commercial HTGRs are described. These results are very useful for the future development of HTGRs. This book is published as one of a series of technical books on fossil fuel and nuclear energy systems by the Power Energy Systems Division of the Japan Society of Mechanical Engineers.
Katayama, Kazunari*; Ushida, Hiroki*; Matsuura, Hideaki*; Fukada, Satoshi*; Goto, Minoru; Nakagawa, Shigeaki
Fusion Science and Technology, 68(3), p.662 - 668, 2015/10
Times Cited Count：14 Percentile：76.58(Nuclear Science & Technology)Tritium production utilizing nuclear reactions by neutron and lithium in a high-temperature gas-cooled reactor is attractive for development of a fusion reactor. From viewpoints of tritium safety and production efficiency, tritium confinement technique is an important issue. It is known that alumina has high resistance for gas permeation. In this study, hydrogen permeation experiments in commercial alumina tubes were conducted and hydrogen permeability, diffusivity and solubility was evaluated. By using obtained data, tritium permeation behavior from an Al
O
-coated Li-compound particle was simulated. Additionally, by using literature data for hydrogen behavior in zirconium, an effect of Zr incorporation into an AlO coating on tritium permeation was discussed. It was indicated that the majority of produced tritium was released through the AlO coating above 500C. However, it is expected that total tritium leak is suppressed to below 0.67% of total tritium produced at 500C by incorporating Zr fine particles into the inside of AlO coating.
Nakagawa, Seiko*; Taguchi, Mitsumasa; Kimura, Atsushi; Nagasawa, Naotsugu; Hiroki, Akihiro
Nuclear Instruments and Methods in Physics Research B, 334, p.64 - 68, 2014/09
Times Cited Count：2 Percentile：19.65(Instruments & Instrumentation)N-saturated 2-propanol solutions containing styrene and maleimide were gelled by the addition of hydroxypropylcellulose and irradiated by proton, He and C-ion beams. The trend in the dose rate and LET effects on the yield and molecular weight distribution of the polymer produced in the gel was almost the same in the solution. On the contrary, the dose rate effect in the gel was higher than that in the solution. This effect was accelerated for irradiations by proton as well as heavier ion with a higher LET value.
Jo, Takahisa; Goto, Takehiro; Yabuki, Kentaro; Ikegami, Kazunori; Miyagawa, Takayuki; Mori, Tetsuya; Kubo, Atsuhiko; Kitano, Akihiro; Nakagawa, Hiroki; Kawamura, Yoshiaki; et al.
JAEA-Technology 2010-052, 84 Pages, 2011/03
JAEA-Technology-2010-052.pdf:17.14MB
The prototype fast breeder reactor MONJU resumed the System Startup Test (SST) on May 6th 2010 after five months and fourteen years shutdown since the sodium leakage of the secondary heat transport system on December 1995. Core Confirmation Test (CCT) is the first step of SST, which consists of three steps. CCT was finished on July 22nd after 78 days tests. CCT is composed 20 test items including control rods' worth evaluation, radiation dose measurement etc..
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.
-raysUechi, Hiroki*; Hakura, Yoshihiko*; Nakagawa, Takaharu*; Matsuda, Satoshi*; Kishi, Hajime*; Idesaki, Akira; Oshima, Takeshi
no journal, ,
Cyanate/epoxy resins are expected to use as insulating material of a superconducting magnet system in a proton accelerator. However, there are little reports on the radiation resistance of the resins. In this work, -ray irradiation effect on the cyanate/epoxy resins in which molecular structures of cyanate and epoxy were varied was investigated by gas analysis, dymanic visco-erastic test, and so on. It was found that glass transition temperature (Tg) of all resins dicreased and that the behavior of Tg was different among the resins. This suggests that there is a relationship between the molecular structure and radiation resistance of the cyanate/epoxy resins.
Shibata, Kaoru*; Takahashi, Nobuaki; Kawakita, Yukinobu; Kamazawa, Kazuya*; Yamada, Takeshi*; Ueno, Hiroki; Shimakura, Hironori; Nakajima, Kenji; Kambara, Wataru; Inamura, Yasuhiro; et al.
no journal, ,
no abstracts in English
Shibata, Kaoru*; Takahashi, Nobuaki; Kawakita, Yukinobu; Kamazawa, Kazuya*; Yamada, Takeshi*; Ueno, Hiroki; Shimakura, Hironori; Nakajima, Kenji; Kambara, Wataru; Inamura, Yasuhiro; et al.
no journal, ,
no abstracts in English
Nakagawa, Shigeaki; Kunitomi, Kazuhiko; Tachibana, Yukio; Terada, Atsuhiko; Minatsuki, Isao*; Oyama, Sunao*; Tsukamoto, Hiroki*
no journal, ,
no abstracts in English
Nakagawa, Hiroshi; Inoue, Rintaro*; Oda, Takashi*; Yagi, Maho*; Saio, Tomohide*; Oroguchi, Tomotaka*; Nagata, Yuya*; Sugiyama, Masaaki*; Sato, Mamoru*; Kawakita, Yukinobu; et al.
no journal, ,
Proteins have hierarchical structures and hierarchical dynamics. The importance of analyzing the structural dynamics of proteins in solution has been increasing in recent years, and neutron scattering is expected to be an experimental method to study the hierarchical structures on the nanometer order and the dynamics on the pico- to nanosecond time scales, which are relevant to biological functions. In this study, we used the quasi-elastic neutron scattering and small-angle neutron scattering instruments installed at MLF to elucidate the dynamics of these structures in space and time. We aim to establish a new generation of neutron structural biology that will lead protein science in Japan.
Nakagawa, Hiroshi; Inoue, Rintaro*; Oda, Takashi*; Yagi-Utsumi, Maho*; Saio, Tomohide*; Oroguchi, Tomotaka*; Nagata, Yuya*; Sugiyama, Masaaki*; Sato, Mamoru*; Kawakita, Yukinobu; et al.
no journal, ,
Proteins have hierarchical structures and hierarchical dynamics. Neutron scattering is expected to be a promising experimental technique to study the hierarchical structure on the nanometer order related to biological functions and the structure and dynamics on the pico- to nanosecond time scale. The research was initiated with the aim of elucidating the structure and dynamics of these spatiotemporal scales (MLF Long-term Proposal 2019L0300). In this proposal, we used samples of characterized functional multidomain proteins, including folded proteins and naturally denatured proteins, to promote our research. Researchers in a wide range of specialized fields collaborated to develop "a protein partial deuteration method utilizing the features of neutron scattering", "a wide spatio-temporal seamless analysis method by linking various neutron spectrometers", "a method for visualizing protein dynamics by linking neutron and computational science," and "a neutron quasi-elastic scattering measurement method for dilute protein solutions" and to We have pioneered a new generation of neutron structural biology that will lead protein science in Japan.
