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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：44 Percentile：96.93(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.
Yokota, Wataru; Sato, Takahiro; Kamiya, Tomihiro; Okumura, Susumu; Kurashima, Satoshi; Miyawaki, Nobumasa; Kashiwagi, Hirotsugu; Yoshida, Kenichi; Funayama, Tomoo; Sakashita, Tetsuya; et al.
JAEA-Technology 2014-018, 103 Pages, 2014/09
JAEA-Technology-2014-018.pdf:123.66MB
The world's first microbeam focusing technology for heavy ions of hundreds MeV accelerated by a cyclotron has been developed at the TIARA facility in the Takasaki Advanced Radiation Research Institute of the Japan Atomic Energy Agency. The technology enables us to form a microbeam of less than 1 
m in diameter and to shoot a specified point on a target by one ion (single-ion hit) with spatial accuracy of microbeam size. In the course of the development, a cyclotron technology to accelerate a small energy-spread beam of hundres MeV, which is necessary for focusing to 1 m, has been developed as well as a beam focusing apparatus, beam size measurement and so forth based on the several-MeV microbeam/single-ion hit system of the TIARA electrostatic accelerators. Applicability of the technologies was examined by actual use in irradiation experiment and the result were fed back to them. This paper reports the process and the results of the development over ten years.
-ray irradiated organic thin film transistors based on perfluoropentacene with polyimide gate insulatorTakayanagi, Yutaro*; Ouchi, Hirokuni*; Duan, Z.*; Okukawa, Takanori*; Yanagi, Yuichiro*; Yoshida, Akira*; Taguchi, Mitsumasa; Hirao, Toshio; Nishioka, Yasushiro*
Journal of Photopolymer Science and Technology, 25(4), p.493 - 496, 2012/08
Times Cited Count：0 Percentile：0.01(Polymer Science)Organic thin film fields effect transistors are expected to be used in spacecrafts/satellites because they can realize large-size, mechanical flexibility, light weight and low-cost devices. N-channel field effect transistors with a Si/polyimide(PI)/perfluoropentacene/Au structure were fabricated, and irradiated with -ray from Co source. The changes of the drain current vs. source/drain voltage characteristics were measured after every 200 Gy in silicon Gy(Si) irradiations up to the total dose of 1200 Gy(Si). The drain current gradually increased up to the total dose of 1200 Gy(Si). The threshold voltage decreased up to 400 Gy(Si), and gradually recovered above 600 Gy(Si). The mobility was almost unchanged up to 1200 Gy(Si). Those behaviors were explained by accumulation of positive trapped charge within the gate insulator PI near the interface. Evidence for the accumulation of interface traps was hardly observed.
N NMR relaxation measurementsYoshida, Yuichiro*; Okuri, Takatoshi*; Takeda, Chika*; Kuroki, Ryota; Izuhara, Kenji*; Imoto, Taiji*; Ueda, Tadashi*
Biochemical and Biophysical Research Communications, 358(1), p.292 - 297, 2007/06
Times Cited Count：4 Percentile：9.9(Biochemistry & Molecular Biology)The single nucleotide polymorphism interleukin-13 (IL-13) R110Q is associated with severe bronchial asthma because its lower affinity leads to the augmentation of local IL-13 concentration, resulting in an increase in the signal transduction via IL-13R. Since the mutation site does not directly bind to IL-13 R
2, we carried out NMR relaxation analyses of the wild-type IL-13 and IL-13 R110Q in order to examine whether the R110Q mutation affects the internal motions in IL-13 molecules. The results showed that the internal motion in the micro- to millisecond time scale on helix D, which is suggested to be important for the interaction between IL-13 and IL-13R2, is increased in IL-13-R110Q compared with that in the wild-type IL-13. It therefore appears that the difference in the internal motions on helix D between the wild-type IL-13 and IL-13-R110Q may be involved in their affinity differences with IL-13R2.
Katakabe, Yoichi*; Sugano, Ryuichiro*; Iwakiri, Hirotomo*; Hamaguchi, Dai; Iwai, Takeo*; Yoshida, Naoaki*
no journal, ,
no abstracts in English
Katakabe, Yoichi*; Sugano, Ryuichiro*; Iwakiri, Hirotomo*; Hamaguchi, Dai; Iwai, Takeo*; Yoshida, Naoaki*
no journal, ,
no abstracts in English
Ouchi, Yuichiro; Tadokoro, Noboru; Kitamura, Takafumi; Yoshida, Sachimasa; Kurita, Ichiro
no journal, ,
The Japan Atomic Energy Agency (JAEA) is planning to procure uranium and plutonium mixed oxide (MOX) powder necessary for the prototype fast breeder reactor MONJU and experimental reactor JOYO from Rokkasho Reprocessing Plant (RRP), which is operated by the Japan Nuclear Fuel Limited (JNFL). When both reactors operate as planned, an annual quantity of MOX is estimated at two tons (600 kg of fissile Pu). JAEA has developed a sea transport system including a transport package, shipping containers, vehicles, a ship, and ports, etc., to safely and securely transport large amounts of MOX powder compliant with physical protection measures for Category I materials. This paper describes development of the transport package and shipping container, and will outline the sea transport plan.
