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1. Newly constructed compact accelerator-based neutron facility at AIST

Author

Kino Koichi, Fujiwara Takeshi, Furusaka Michihiro, Hayashizaki Noriyosu, Kato Hidetoshi, Kuroda Ryunosuke, Michishio Koji, Muroga Takemi, Ogawa Hiroshi, O'Rourke Brian E., Oshima Nagayasu, Satoh Daisuke, Sei Norihiro, Shishido Tamao, Suzuki Ryoichi, Tanaka Masahito, Tomota Yo, Toyokawa Hiroyuki, Watazu Akira, Furukawa Kazuro, Nigorikawa Kazuyuki, and Obina Takashi

Subjects
Physics, QC1-999
Abstract

We have constructed a compact accelerator-based neutron facility at the National Institute of Advanced Industrial Science and Technology (AIST) in Japan aiming at development of structural materials of transportation vehicles for weight reduction. The facility consists of electron linear accelerator, neutron source, and a neutron beamline with a measurement hutch. Currently we are commissioning the accelerator and expecting a first neutron beam in 2019.

Published
2020
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8. Design and construction of an electron accelerator for a pulsed neutron facility at AIST

Author

O'Rourke, Brian E., Fujiwara, Takeshi, Furukawa, Kazuro, Furusaka, Michihiro, Hayashizaki, Noriyosu, Kato, Hidetoshi, Kino, Koichi, Kuroda, Ryunosuke, Michishio, Koji, Muroga, Takemi, Nigorikawa, Kazuyuki, Obina, Takashi, Ogawa, Hiroshi, Oshima, Nagayasu, Satoh, Daisuke, Sei, Norihiro, Shishido, Tamao, Suzuki, Ryoichi, Tanaka, Masahito, Tomota, Yo, Toyokawa, Hiroyuki, and Watazu, Akira

Published
2020
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10. Scintillation Properties of Tb-doped SrLu2O4 Single Crystals

Author

Kimura, Hiromi, primary, Fukushima, Hiroyuki, additional, Watanabe, Kenichi, additional, Fujiwara, Takeshi, additional, Kato, Hidetoshi, additional, Tanaka, Masahito, additional, Kato, Takumi, additional, Nakauchi, Daisuke, additional, Kawaguchi, Noriaki, additional, and Yanagida, Takayuki, additional

Published
2024
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13. Development of Oxyfluoride Glasses for X-ray Imaging Applications

Author

Kimura, Hiromi, primary, Shinozaki, Kenji, additional, Sakaeda, Kento, additional, Watanabe, Kenichi, additional, Fujiwara, Takeshi, additional, Tanaka, Masahito, additional, Nakauchi, Daisuke, additional, Kato, Takumi, additional, Kawaguchi, Noriaki, additional, and Yanagida, Takayuki, additional

Published
2023
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19. Transition to the structurally vulnerable nuclear state is an integral part of mouse embryonic development

Author

Tanaka Masahito, Rin Sakanoue, Atsushi Takasu, Naoko Watanabe, Yuta Shimamoto, and Kei Miyamoto

Abstract

Upon fertilization, germ cells are reprogrammed to acquire the ability to develop into an entire organism. Whereas extensive studies have focused on epigenetic reprogramming of chromatin states during development, changes of the nucleus that surrounds chromatin are ill-defined. Here, we show that nuclei become structurally and mechanically vulnerable at the 2-cell stage during mouse embryonic development. The 2-cell stage nuclei are extraordinarily plastic and deformable in contrast to those of 1-cell and 4-cell stages. The mechanically vulnerable nuclear state is attained by autophagy-mediated loss of lamin B1 from the nuclear membrane. This developmentally programmed lamin B1 dynamics is required for chromatin organization and major zygotic genome activation. We thus demonstrate that structural reprogramming of nuclei is a major determinant of embryonic gene expression and acquisition of totipotency.

Published
2023
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21. Imaging Performance of Neutron Flat-Panel-Detector using IGZO-TFT

Author

Fujiwara, Takeshi, primary, Miyoshi, Hiroaki, additional, Mitsuya, Yuki, additional, Wakabayashi, Yasuo, additional, Otake, Yoshie, additional, Kino, Koichi, additional, Tanaka, Masahito, additional, Oshima, Nagayasu, additional, Kimura, Hiromi, additional, and Takahashi, Hiroyuki, additional

Published
2022
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28. Circular dichroism in the vacuum UV region as a nondestructive analysis method for chirality of organic molecules in meteorites

Author

Tanaka, Masahito

Subjects
不斉光反応, 非破壊分析, Nondestructive analysis, キラリティ, Optical rotatory dispersion, 光学活性, Circular dichroism, Chirality, 円二色性, Asymmetric photoreaction
Abstract

隕石中のアミノ酸のキラリティの偏りの検出や宇宙空間での円偏光の観測などの報告から，生体分 子のホモキラリティは宇宙を起源とするという仮説の重要性が高まっている．キラリティの偏りを直 接的かつ非破壊に分析する手法として，円二色性や光学活性などの円偏光を用いた分光手法は有用と 考えられる．本稿では，アミノ酸などが特徴的なスペクトルを示す真空紫外線領域等における円二色 性計測に関する筆者のこれまでの取り組みを紹介するとともに，マイクロビームによる円二色性マッ ピングや光学活性などの分光手法の隕石中のキラリティ分析法としての有効性などに関して報告する．, Spectroscopic techniques using circularly polarized light, such as circular dichroism and optical rotatory dispersion, are considered to be useful as a nondestructive analysis method for the chirality of organic molecules in meteorites. In this paper,wereviewourdevelopmentofacirculardichroismmeasurementsysteminthevacuumUV region using a polarizing undulator, as well as its application to chiral organic molecules, such as amino acids. Moreover, various spectroscopic techniques, such as circular dichroism mapping with a micrometer-scale beam, optical rotatory dispersion, and circular intensity differential scattering, were evaluated as potential nondestructive analysis methods.

Published
2020

30. Neutron flat-panel detector using In–Ga–Zn–O thin-film transistor

Author

Fujiwara, Takeshi, primary, Miyoshi, Hiroaki, additional, Mitsuya, Yuki, additional, Yamada, Norifumi L., additional, Wakabayashi, Yasuo, additional, Otake, Yoshie, additional, Hino, Masahiro, additional, Kino, Koichi, additional, Tanaka, Masahito, additional, Oshima, Nagayasu, additional, and Takahashi, Hiroyuki, additional

Published
2022
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35. Independent contribution of optical attenuation length in ultrafast laser-induced structural change

Author

Shibuya, Tatsunori, primary, Sakaue, Kazuyuki, additional, Ogawa, Hiroshi, additional, Satoh, Daisuke, additional, Dinh, Thanh-Hung, additional, Ishino, Masahiko, additional, Tanaka, Masahito, additional, Washio, Masakazu, additional, Higashiguchi, Takeshi, additional, Nishikino, Masaharu, additional, Kon, Akira, additional, Kubota, Yuya, additional, Inubushi, Yuichi, additional, Owada, Shigeki, additional, Kobayashi, Yohei, additional, and Kuroda, Ryunosuke, additional

Published
2021
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38. Behavior of sulfate ions during biogenic scorodite crystallization from dilute As(III)-bearing acidic waters

Author

Tanaka, Masahito, Sasaki, Keiko, Okibe, Naoko, Tanaka, Masahito, Sasaki, Keiko, and Okibe, Naoko

Abstract

This study revealed the importance of SO_4^ 2− ions during biogenic scorodite crystallization via a two-stage As-removal process, using a combination of liquid and solid analyses (chemical digestion, FT-IR, SEM, TG-DTA, particle distribution). The first-stage As-removal was induced by microbial oxidation of Fe^2+ and As(III), precipitating SO_4^ 2− -bearing amorphous precursors composed of basic ferric sulfate (MFe_x(SO_4)_y(OH)_z) and ferric arsenate (FeAsO_4·(2+n)H_2O). This was followed by an induction period (a period of constant concentration), where dissolution-recrystallization of unstable amorphous precursors proceeded: Re-dissolved metal ions became locally concentrated on the surface of precursors, which gave the driving force for the second-stage As-removal as secondary layers of crystalline biogenic scorodite (Fe(AsO_4)_0.94(SO4)_0.08·1.69H_2O) out of even more dilute and seeded solution. This phase transformation process was also accompanied by continuous dehydration. This two-stage As-removal via SO_4^ 2- -mediated phase transformation was shown to be key to promote biogenic scorodite formation with greater final As-removal from dilute As(III)-bearing solutions.

Published
2021

47. Ablation threshold and crater morphology of amorphous and crystalline SiO2 glass for extreme ultraviolet femtosecond pulses

Author

Shibuya, Tatsunori, Sakaue, Kazuyuki, Ogawa , Hiroshi, Dinh, Thanhhung, Satoh, Daisuke, Terasawa, Eichi, Washio, Masakazu, Tanaka, Masahito, Higashiguchi, Takeshi, Ishino, Masahiko, Kubota, Yuya, Inubushi, Yuichi, Owada, Shigeki, Nishikino, Masaharu, Kobayashi, Yohei, Kuroda, Ryunosuke, Masahiko, Ishino, Masaharu, Nishikino, Shibuya, Tatsunori, Sakaue, Kazuyuki, Ogawa , Hiroshi, Dinh, Thanhhung, Satoh, Daisuke, Terasawa, Eichi, Washio, Masakazu, Tanaka, Masahito, Higashiguchi, Takeshi, Ishino, Masahiko, Kubota, Yuya, Inubushi, Yuichi, Owada, Shigeki, Nishikino, Masaharu, Kobayashi, Yohei, Kuroda, Ryunosuke, Masahiko, Ishino, and Masaharu, Nishikino

Abstract

The ablation threshold fluence and crater morphology of amorphous and crystalline SiO2 glass were analyzed in the regime of an extreme ultraviolet femtosecond pulse. Despite the difference between the densities (or optical penetration depths) of amorphous and crystalline SiO2 glass, the ablation threshold fluences and crater morphologies were found to be comparable. In addition, we compared our experimental results at a 10.3 nm wavelength with those in a previous work at a 13.5 nm wavelength. We conclude that the impact of the difference in density or optical penetration depth of several tens of percent on the ablation process is limited.

Published
2020

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