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Hirata, Yoshinobu*; Nakagawa, Hiroshi; Yamauchi, Hiroki; Kaneko, Koji; Hagihara, Masato; Yamaguchi, Hideyuki*; Imaizumi, Teppei*; Nishizu, Takahisa*
International Journal of Biological Macromolecules, 306, p.141668_1 - 141668_7, 2025/03
Times Cited Count：0 Percentile：0.00(Biochemistry & Molecular Biology)We used quasi-elastic neutron scattering (QENS) to investigate the effect of the ratio of water to rice on the molecular dynamics of cooked rice starch during retrogradation. X-ray diffraction and differential scanning calorimetric measurements revealed that the degree of recrystallization and change in enthalpy were smaller with an increase in the amount of water added for cooking rice, whereas little difference in the crystallinity of the gelatinized rice starch was detected. The QENS measurements determined that the elastic incoherent structure factor (EISF) values of gelatinized samples were smaller with an increase in the amount of water added for cooking rice, indicating that the molecular dynamics of gelatinized rice starch with higher added water content were spatially more extended.
Hirata, Yoshinobu*; Kaneko, Fumitoshi*; Radulescu, A.*; Nishizu, Takahisa*; Katsuno, Nakako*; Imaizumi, Teppei*; Motokawa, Ryuhei; Kumada, Takayuki; Nakagawa, Hiroshi
Journal of Applied Glycoscience, 72(1), p.7201102_1 - 7201102_9, 2025/02
A simultaneous measurement system of SANS/FTIR-ATR was applied to record multiple structural changes in potato starch during retrogradation. In the SANS patterns, the shoulder-like peak becomes more pronounced with time. The peak intensity, Imax, which represents the amount of orderly arranged double helical structures, increased over time, showing that starch reassembled orderly on the nanoscale upon retrogradation. In the FTIR-ATR spectra, the increase of the ratio of absorptions at 1042 cm
and 1016 cm, indicating the amount of short-range ordered structure in starch increased during retrogradation. The time to obtain half of the equilibrium value for 
was larger than that for Imax. Changes in the short-range ordered structure of starch were observed to converge prior to changes in the nanostructure. These results indicate that the double-helix structures are initially formed by amylopectin side chains, and then these double-helical structures are arranged orderly.
Nakagawa, Hiroshi; Hirata, Yoshinobu*; Nishizu, Takahisa*
Teion Seibutsu Kogakkai-Shi, 70(1), p.17 - 24, 2024/06
Inelastic neutron scattering can measure the atomic thermal fluctuations in pico- to nano-second time scales, and is the powerful method to observe the low-energy dynamics in THz region and to characterize the motional geometry of bio-molecules. It is widely used in material science research, such as the study of the molecular motion of water using the strong scattering from hydrogen atoms and the molecular motion of glass materials, but it is also effective as a probe to directly observe the molecular motion of various biomolecules such as proteins and starch, and food molecules. Here, the characteristics of neutron beams and the fundamentals of inelastic neutron scattering spectra will be explained. Then, three typical examples of studies on the obtained molecular motions will be presented. These research examples may be applicable to various issues in cryo-biology.
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
Times Cited Count：11 Percentile：81.30(Chemistry, Applied)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.
Ito, Masayasu; Kawamata, Kazuo; Tayama, Yoshinobu; Kanazawa, Yoshiharu; Yonekawa, Minoru; Nakagawa, Tetsuya; Omi, Masao; Iwamatsu, Shigemi
JAEA-Technology 2011-022, 44 Pages, 2011/07
JAEA-Technology-2011-022.pdf:3.29MB
Hot laboratory are facilities that execute the post irradiation examination of sample irradiated in material testing reactors etc. The handling of high burn-up fuel is scheduled in the JMTR (Japan Materials Testing Reactor) Hot Laboratory with JMTR re-operate in FY 2011. This report describes evaluation, production and installation of shielding of the hot cells in the JMTR Hot Laboratory.
Sozawa, Shizuo; Nakagawa, Tetsuya; Iwamatsu, Shigemi; Hayashi, Koji; Tayama, Yoshinobu; Kawamata, Kazuo; Yonekawa, Minoru; Taguchi, Taketoshi; Kanazawa, Yoshiharu; Omi, Masao
JAEA-Technology 2009-070, 27 Pages, 2010/03
JAEA-Technology-2009-070.pdf:7.46MB
Refurbishment of the Japan Materials Testing Reactor (JMTR), which is recognized as one of important facilities in Japan for safety research, is in progress by the JAEA. In Extensive safety research of light-water reactor (LWR) fuels and materials under a contract with the Nuclear and Industrial Safety Agency of Ministry of Economy, Trade and Industry of Japan, the irradiation tests are planned in order to examine integrity of the LWR fuels and structure materials. For the irradiation tests of high burnup fuels and irradiated materials in the JMTR, modification of the hot laboratory facilities are needed, which are (1) making of application books for strengthening JMTR hot-lab. cell-shielding, (2) the capsule assembling device of detailed design, (3) safety analysis for domestic transportation cask and (4) confirmatory testing of diamond drill of fuel-rod center-hole processing device.
Shibata, Akira; Kawamata, Kazuo; Taguchi, Taketoshi; Kaji, Yoshiyuki; Shimizu, Michio*; Kanazawa, Yoshiharu; Matsui, Yoshinori; Iwamatsu, Shigemi; Sozawa, Shizuo; Tayama, Yoshinobu; et al.
JAEA-Technology 2008-029, 40 Pages, 2008/03
JAEA-Technology-2008-029.pdf:25.78MB
Irradiation assisted stress corrosion cracking (IASCC) is considered to be one of the key issues from a viewpoint of the life management of core components in the aged Light Water Reactors. The in-situ crack extension examination and the in-situ constant load tensile test in the reactor are required for the study of IASCC. There are, however, some technical hurdles to be overcome for the experiments. For this in-situ IASCC test, techniques for assembling pre-irradiated specimens into an capsule in a hot cell by remote handling are necessary. In this report, I describe the establishment of those remote assembling techniques and development of new welding apparatus and the TIG upset welding for stainless tube of 3 mm in thickness. Already IASCC capsules having pre-irradiated CT specimens were remotely assembled using these techniques in the hot cell for performing crack growth tests under irradiation in JMTR. And eight in-situ IASCC capsules have been finished successfully in JMTR.
Kumada, Hiroaki; Yamamoto, Kazuyoshi; Matsumura, Akira*; Yamamoto, Tetsuya*; Nakagawa, Yoshinobu*
Journal of Physics; Conference Series, 74, p.021010_1 - 021010_7, 2007/00
no abstracts in English
Kageji, Teruyoshi*; Mizobuchi, Keiji*; Nagahiro, Shinji*; Nakagawa, Yoshinobu*; Kumada, Hiroaki
Proceedings of 12th International Congress on Neutron Capture Therapy (ICNCT-12), p.35 - 36, 2006/10
We analyzed the correlation between boron neutron capture therapy (BNCT) radiation dose and histopathological findings of autopsy or salvage surgery. For the complete remission of glioblastoma (GBM) after BNCT, minimum gross tumor volume (GTV) and clinical target volume (CTV) dose should be 65 and 45 Gy-Eq as a JAERI Computational Dosimetry System (JCDS) dose.
Kageji, Teruyoshi*; Mizobuchi, Keiji*; Nagahiro, Shinji*; Nakagawa, Yoshinobu*; Kumada, Hiroaki
Proceedings of 12th International Congress on Neutron Capture Therapy (ICNCT-12), p.60 - 61, 2006/10
We compared and evaluated boron neutron capture therapy (BNCT) radiation dose between gold wire measurement and JAERI Computational Dosimetry System (JCDS). Gold wire analysis demonstrates the actual BNCT dose though it dose not reflect the real the maximum and minimum dose in tumor tissue. We can conclude that JCDS is precise and high-reliable dose planning system for BNCT.
Kageji, Teruyoshi*; Mizobuchi, Keiji*; Nagahiro, Shinji*; Nakagawa, Yoshinobu*; Kumada, Hiroaki
Proceedings of 12th International Congress on Neutron Capture Therapy (ICNCT-12), p.62 - 63, 2006/10
We compared and evaluated BNCT radiation dose using JAERI Computational Dosimetry System (JCDS) between BSH-base intra-operative BNCT and BSH, BPA-based non-operative BNCT. In comparison of BNCT radiation dose, BSH-based intra-operative BNCT was 1.4-2.1 times higher than BSH, BPA-basednon-operative BNCT.
Z-type hexaferrite (Ba, Sr)
CoFe
O
by high-temperature neutron diffractionTakada, Yukio*; Nakagawa, Takashi*; Tokunaga, Masatoshi*; Fukuta, Yasunari*; Tanaka, Takayoshi*; Yamamoto, Takao*; Tachibana, Takeshi*; Kawano, Shinji*; Ishii, Yoshinobu; Igawa, Naoki
Journal of Applied Physics, 100(4), p.043904_1 - 043904_7, 2006/08
Times Cited Count：73 Percentile：89.11(Physics, Applied)no abstracts in English
Kumada, Hiroaki; Yamamoto, Kazuyoshi; Matsumura, Akira*; Nakagawa, Yoshinobu*
Hoshasen, 31(4), p.287 - 297, 2005/10
no abstracts in English
Z-type hexaferrite estimated by high-temperature neutron diffractionTakada, Yukio*; Nakagawa, Takashi*; Fukuta, Yasunari*; Tokunaga, Masatoshi*; Yamamoto, Takao*; Tachibana, Takeshi*; Kawano, Shinji*; Igawa, Naoki; Ishii, Yoshinobu
Japanese Journal of Applied Physics, 44(5A), p.3151 - 3156, 2005/05
Times Cited Count：4 Percentile：17.53(Physics, Applied)We investigated the correlation between the thremomagnetic curve of CoZ-Type hexagonal barium ferrite, BaCo
Fe
O and its magnetic moment direction. The thermomagnetic curve shows two significant magnetization slumps at 540K and 680K. High-temperature neutron diffraction experiment and Rietveld analyses indicate that temperature rise from 523 to 573K makes the magnetic moments turn to the c-axis from a direction parallel to the c-plane most significantly.The change in average orientation of the magnetic moments must be induced by the disappearence of the contribution of cobalt to magnetism in this temperature.
Kumada, Hiroaki; Yamamoto, Kazuyoshi; Murayama, Yoji; Matsumura, Akira*; Nakagawa, Yoshinobu*
Monte Karuro Keisanho Kodoka No Genjo; Dai-3-Kai Monte Karuro Shimyureshon Kenkyukai Hobunshu, p.185 - 194, 2004/12
no abstracts in English
Kageji, Teruyoshi*; Nagahiro, Shinji*; Mizobuchi, Keiji*; Toi, Hiroyuki*; Nakagawa, Yoshinobu*; Kumada, Hiroaki
Applied Radiation and Isotopes, 61(5), p.1063 - 1067, 2004/11
Times Cited Count：9 Percentile：51.61(Chemistry, Inorganic & Nuclear)no abstracts in English
Kumada, Hiroaki; Yamamoto, Kazuyoshi; Yamamoto, Tetsuya*; Nakai, Kei*; Nakagawa, Yoshinobu*; Kageji, Teruyoshi*; Matsumura, Akira*
Applied Radiation and Isotopes, 61(5), p.1045 - 1050, 2004/11
Times Cited Count：13 Percentile：62.79(Chemistry, Inorganic & Nuclear)To carry out the BNCT clinical trials based on accurate dosimetry of several absorbed doses given to a patient, we have developed JCDS which can determine the absorbed doses by numerical simulation. The aim of this study is to improve the accuracy of the BNCT dosimetry efficiently. We have developed the multi-voxel calculation method reconstructing the original voxel model by combining of several voxel cell sizes such as in 5mm, 10mm and 20mm voxel cell. To verify the accuracy of the multi-voxel method, the calculation results were compared with the phantom experimental data. These results proved that the multi-voxel calculation enables JCDS to more accurately estimate the absorbed doses to a patient by efficient calculations.
Takamatsu, Kuniyoshi; Nakagawa, Shigeaki; Sakaba, Nariaki; Takada, Eiji*; Tochio, Daisuke; Shimakawa, Satoshi; Nojiri, Naoki; Goto, Minoru; Shibata, Taiju; Ueta, Shohei; et al.
JAERI-Tech 2004-063, 61 Pages, 2004/10
JAERI-Tech-2004-063.pdf:3.14MB
The High Temperature engineering Test Reactor (HTTR) is a graphite moderated and gas cooled reactor with the thermal power of 30MW and the reactor outlet coolant temperature of 850
C/950C. Rise-to-power test in the HTTR was performed from March 31th to May 1st in 2004 as phase 5 test up to 30MW in the high temperature test operation mode. It was confirmed that the thermal reactor power and the reactor outlet coolant temperature reached to 30MW and 950C respectively on April 19th in the single operation mode using only the primary pressurized water cooler. The parallel loaded operation mode using the intermediate heat exchanger and the primary pressurized water cooler was performed from June 2nd and JAERI (Japan Atomic Energy Research Institute) obtained the certificate of the pre-operation test on June 24th from MEXT (Ministry of Education Culture Sports Science and Technology) after all the pre-operation tests were passed successfully in the high temperature test operation mode. Achievement of the reactor-outlet coolant temperature of 950C is the first time in the world. It is possible to extend highly effective power generation with a high-temperature gas turbine and produce hydrogen from water with a high-temperature. This report describes the results of the high-temperature test operation of the HTTR.
Kumada, Hiroaki; Yamamoto, Kazuyoshi; Torii, Yoshiya; Matsumura, Akira*; Nakagawa, Yoshinobu*
Japanese Journal of Medical Physics, Vol.23, Supplement 3, p.292 - 295, 2003/09
no abstracts in English
Nakagawa, Yoshinobu*; Pooh, K. H.*; Kobayashi, Toru*; Kageji, Teruyoshi*; Uyama, Shinichi*; Matsumura, Akira*; Kumada, Hiroaki
Journal of Neuro-Oncology, 62(1), p.87 - 99, 2003/04
Times Cited Count：135 Percentile：83.59(Oncology)Our concept of boron neutron capture therapy (BNCT) is selective destruction of tumor cells using the heavy-charged particles Yielded through 10B(n, alpha)7 Li reactions. In the analysis of side effects due to radiation, we included all the 159 patients treated between 1977 and 2001. With respect to the radiation dose (i.e. physical dose of boron n-alpha reaction), the new protocol prescribes a minimum tumor volume dose of 15Gy or, alternatively, a minimum target volume dose of 18Gy. The maximum vascular dose should not exceed 15Gy (physical dose of boron n-alpha reaction) and the total amount of gamma rays should remain below 10Gy, including core gamma rays from the reactor and capture gamma in brain tissue. The outcomes for 10 patients who were treated by the new protocol using a new mode composed of thermal and epithermal neutrons are reported.
