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Li, W.*; Yamada, Shinya*; Hashimoto, Tadashi; Okumura, Takuma*; Hayakawa, Ryota*; Nitta, Kiyofumi*; Sekizawa, Oki*; Suga, Hiroki*; Uruga, Tomoya*; Ichinohe, Yuto*; et al.
Analytica Chimica Acta, 1240, p.340755_1 - 340755_9, 2023/02
Times Cited Count:1 Percentile:34.31(Chemistry, Analytical)no abstracts in English
Arai, Yosuke*; Kuroda, Kenta*; Nomoto, Takuya*; Tin, Z. H.*; Sakuragi, Shunsuke*; Bareille, C.*; Akebi, Shuntaro*; Kurokawa, Kifu*; Kinoshita, Yuto*; Zhang, W.-L.*; et al.
Nature Materials, 21(4), p.410 - 415, 2022/04
Times Cited Count:4 Percentile:75.25(Chemistry, Physical)Okumura, Takuma*; Azuma, Toshiyuki*; Bennet, D. A.*; Caradonna, P.*; Chiu, I.-H.*; Doriese, W. B.*; Durkin, M. S.*; Fowler, J. W.*; Gard, J. D.*; Hashimoto, Tadashi; et al.
IEEE Transactions on Applied Superconductivity, 31(5), p.2101704_1 - 2101704_4, 2021/08
Times Cited Count:1 Percentile:11.71(Engineering, Electrical & Electronic)A superconducting transition-edge sensor (TES) microcalorimeter is an ideal X-ray detector for experiments at accelerator facilities because of good energy resolution and high efficiency. To study the performance of the TES detector with a high-intensity pulsed charged-particle beam, we measured X-ray spectra with a pulsed muon beam at the Japan Proton Accelerator Research Complex (J-PARC) in Japan. We found substantial temporal shifts of the X-ray energy correlated with the arrival time of the pulsed muon beam, which was reasonably explained by pulse pileup due to the incidence of energetic particles from the initial pulsed beam.
Okumura, Takuma*; Azuma, Toshiyuki*; Bennet, D. A.*; Caradonna, P.*; Chiu, I. H.*; Doriese, W. B.*; Durkin, M. S.*; Fowler, J. W.*; Gard, J. D.*; Hashimoto, Tadashi; et al.
Physical Review Letters, 127(5), p.053001_1 - 053001_7, 2021/07
Times Cited Count:9 Percentile:78.48(Physics, Multidisciplinary)We observed electronic X rays emitted from muonic iron atoms using a superconducting transition-edge-type sensor microcalorimeter. The energy resolution of 5.2 eV in FWHM allowed us to observe the asymmetric broad profile of the electronic characteristic and X rays together with the hypersatellite X rays around 6 keV. This signature reflects the time-dependent screening of the nuclear charge by the negative muon and the -shell electrons, accompanied by electron side-feeding. Assisted by a simulation, this data clearly reveals the electronic - and -shell hole production and their temporal evolution during the muon cascade process.
Kitazato, Kohei*; Milliken, R. E.*; Iwata, Takahiro*; Abe, Masanao*; Otake, Makiko*; Matsuura, Shuji*; Takagi, Yasuhiko*; Nakamura, Tomoki*; Hiroi, Takahiro*; Matsuoka, Moe*; et al.
Nature Astronomy (Internet), 5(3), p.246 - 250, 2021/03
Times Cited Count:30 Percentile:96.87(Astronomy & Astrophysics)Here we report observations of Ryugu's subsurface material by the Near-Infrared Spectrometer (NIRS3) on the Hayabusa2 spacecraft. Reflectance spectra of excavated material exhibit a hydroxyl (OH) absorption feature that is slightly stronger and peak-shifted compared with that observed for the surface, indicating that space weathering and/or radiative heating have caused subtle spectral changes in the uppermost surface. However, the strength and shape of the OH feature still suggests that the subsurface material experienced heating above 300 C, similar to the surface. In contrast, thermophysical modeling indicates that radiative heating does not increase the temperature above 200 C at the estimated excavation depth of 1 m, even if the semimajor axis is reduced to 0.344 au. This supports the hypothesis that primary thermal alteration occurred due to radiogenic and/or impact heating on Ryugu's parent body.
Kuroda, Kenta*; Arai, Yosuke*; Rezaei, N.*; Kunisada, So*; Sakuragi, Shunsuke*; Alaei, M.*; Kinoshita, Yuto*; Bareille, C.*; Noguchi, Ryo*; Nakayama, Mitsuhiro*; et al.
Nature Communications (Internet), 11, p.2888_1 - 2888_9, 2020/06
Times Cited Count:14 Percentile:74.84(Multidisciplinary Sciences)Iida, Kazuki*; Yoshida, Hiroyuki*; Okabe, Hirotaka*; Katayama, Naoyuki*; Ishii, Yuto*; Koda, Akihiro*; Inamura, Yasuhiro; Murai, Naoki; Ishikado, Motoyuki*; Kadono, Ryosuke*; et al.
Scientific Reports (Internet), 9(1), p.1826_1 - 1826_9, 2019/02
Times Cited Count:8 Percentile:59.99(Multidisciplinary Sciences)Kanzaki, Norie; Kataoka, Takahiro*; Kobashi, Yusuke*; Yunoki, Yuto*; Ishida, Tsuyoshi*; Sakoda, Akihiro; Ishimori, Yuu; Yamaoka, Kiyonori*
Radioisotopes, 67(2), p.43 - 57, 2018/02
We previously reported that low-dose radiation induces the anti-oxidative function in many organ systems of mice. This results in the suppression of several kinds of oxidative stress-induced damage. This study was conducted with the objective of revealing the health effects of low-dose radiation obtained from our previous reports and searching for a new treatment based on low-dose radiation, such as radon therapy. We extracted the characteristics of the effects of low dose radiation suppressing diseases and enhancing the anti-oxidative function using fuzzy answer by self-organizing map (SOM) based on mutual knowledge. The relationship between the suppressive effect and increased antioxidative function was shown in our result, and the concentration dependence of the effect against pain was shown on the output map. Although the effect against other organs depending on concentration was unpredictable, our results indicate that low-dose radiation may also be suitable for treatment of liver disease and brain disease.
Kashiwagi, Mieko; Watanabe, Kazuhiro; Yamanaka, Haruhiko; Maejima, Tetsuya; Terunuma, Yuto*; Oda, Yuki; Tobari, Hiroyuki; Dairaku, Masayuki; Hanada, Masaya
no journal, ,
Toward the neutral beam (NB) system of ITER, the prototype of the ITER NB is under construction in the NB test facility (NBTF), Padova, Italy. For the NBTF, Japan Atomic Energy Agency manufactures, transports and constructs the 1MV high voltage power supply components to generate 1 MV, 60 A for 3600 s, which consist of fourteen components such as five DC generators and transmission lines with 100 m in a length. The manufacturing of the power supply components is in progress as scheduled. Three of five DCGs and 80% of the transmission lines have been completed. In the factory, the voltage holding test including the margin of 20% were successfully demonstrated. Then, these are under transportation to the NBTF. The construction work is started from Dec/2015 as scheduled. As the one of R&Ds results, the development of the water choke made of fiber reinforced plastic (FRP) is reported, which is the alternative of the conventional ceramic.
Kanzaki, Norie; Kataoka, Takahiro*; Kobashi, Yusuke*; Ishida, Tsuyoshi*; Yunoki, Yuto*; Sakoda, Akihiro; Ishimori, Yuu; Yamaoka, Kiyonori*
no journal, ,
We have suggested that low-dose radiation increases anti-oxidative function and inhibits various oxidative stress-related diseases. On the other hand, there are some reports about the extraction of some plants which inhibit similar diseases. In this research, we collected and analyzed the reports for comprehensive comparison. For example, we found that the effects of radon 2000 Bq/m inhalation for 24 hours (low-dose irradiation) or taraxeren-3-one (the extraction from diospyros maritima) 20 mg/kg bodyweight administration were similar with the effects of indomethacin 10 mg/kg bodyweight administration regarding carrageenan-induced paw edema. Our results have a limitation of small dataset but are useful for future research about oxidative stress.
Kanzaki, Norie; Kataoka, Takahiro*; Kobashi, Yusuke*; Ishida, Tsuyoshi*; Yunoki, Yuto*; Sakoda, Akihiro; Ishimori, Yuu; Yamaoka, Kiyonori*
no journal, ,
We have reported that radon inhalation inhibits oxidative stress-related diseases. In our previous study, we comprehensively evaluated the results. The datasets were normalized in 0 as the control data and 1 as the disease data. However, the suppressive effects vary depending on the disease type. In the present study, we classified them and analyzed the data of each organ. Therefore, we could compare radon therapy with other treatments in detail.
Higemoto, Wataru; Okazawa, Takeshi; Ito, Takashi; Oda, Yuto*; Yoshida, Yoshiyuki*
no journal, ,
no abstracts in English
Ishida, Tsuyoshi; Sakoda, Akihiro; Kataoka, Takahiro*; Kanzaki, Norie; Tanaka, Hiroshi; Yunoki, Yuto*; Mitsunobu, Fumihiro*; Yamaoka, Kiyonori*
no journal, ,
We focused on the sebum layer and examined the solubility of radon in the components and its temperature dependence in order to clarify the effect of radon water on skin. As a result, the solubility of radon water by sebum component showed the maximum value for methyl myristate and squalene at each temperature, and the minimum value for triolein. In addition, it could also be suggested that triolein is greatly involved in the solubility of radon in sebum.
Higemoto, Wataru; Oda, Yuto; Miyazaki, Itsuki*; Ito, Takashi; Suzuki, Kohei*; Oshima, Yoshiki*; Yokoyama, Makoto*
no journal, ,
no abstracts in English
Miyazaki, Itsuki*; Higemoto, Wataru; Oda, Yuto; Ito, Takashi; Isobe, Masaaki*
no journal, ,
Higemoto, Wataru; Okazawa, Takeshi*; Oda, Yuto; Miyazaki, Itsuki*; Ito, Takashi; Yoshida, Yoshiyuki*
no journal, ,
Higemoto, Wataru; Miyazaki, Itsuki*; Oda, Yuto; Ito, Takashi; Suzuki, Kohei*; Oshima, Yoshiki*; Yokoyama, Makoto*
no journal, ,
no abstracts in English
Kuwabara, Yuto*; Demachi, Kazuyuki*; Chen, S.*; Nishino, Hiroyuki; Onoda, Yuichi
no journal, ,
no abstracts in English
Kuwabara, Yuto*; Demachi, Kazuyuki*; Kasahara, Naoto*; Chen, S.*; Nishino, Hiroyuki; Onoda, Yuichi; Kurisaka, Kenichi
no journal, ,
In order to quantitatively evaluate the ability of a nuclear plant to recover its safety functions, we are developing a method to simulate accident management in chronological order according to an accident scenario, rather than simply evaluating the probability, and to evaluate whether or not a major accident will eventually occur, i.e., whether or not the minimum necessary safety functions can be recovered within a time limit. In this presentation, we will discuss the development of a method to evaluate whether or not the minimum necessary safety functions can be recovered within the time limit. In this presentation, the specific procedure and management examples of the method will be explained.
Demachi, Kazuyuki*; Kuwabara, Yuto*; Kasahara, Naoto*; Nishino, Hiroyuki; Onoda, Yuichi; Kurisaka, Kenichi
no journal, ,
Our aim is to develop a technology to suppress the expansion of accident damage by improving the reactor structural resilience as a solution to the problem of restoring the safety function of structures after destruction, which has been an issue since the Fukushima Daiichi Nuclear Power Plant accident. In this research, the visualization method of resilience of nuclear structures was proposed in order to visualize the capacity to mitigate and to recover safety function loss by applying and improving the resilience index.