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2 results on '"Yoshinori Miwa"'

1. Hyper Suprime-Cam: System design and verification of image quality

Author

Masashi Chiba, Craig P. Loomis, Yoshihiko Yamada, Fumiaki Nakata, Yousuke Utsumi, Yutaka Komiyama, Toshifumi Futamase, Yao Cheng Lee, Yoshinori Miwa, Fumihiro Uraguchi, Paul T. P. Ho, Kyoji Nariai, Tomio Kurakami, Takashi Hamana, Yutaka Ezaki, Yoshiyuki Obuchi, Michael A. Strauss, Hideo Yokota, Dun Zen Jeng, Yukiko Kamata, Kazuyuki Kasumi, Satoru Iwamura, Eric J.-Y. Liaw, Naoki Yasuda, Hiroki Fujimori, Satoshi Kawanomoto, Hisanori Furusawa, Noboru Ito, Tadafumi Takata, Hisanori Suzuki, Atsushi J. Nishizawa, Chi Fang Chiu, Yusuke Hayashi, Robert Armstrong, Tomonori Usuda, Makoto Endo, Masamune Oguri, Hitomi Yamanoi, Hiroaki Aihara, Hitoshi Murayama, Robert H. Lupton, Kohei Imoto, Masaharu Muramatsu, Naoto Dojo, Michitaro Koike, Hiroyuki Ikeda, Kotaro Akutsu, Satoshi Miyazaki, Tomohisa Uchida, Satoshi Sofuku, James E. Gunn, Hiroshi Karoji, Masayuki Tanaka, Toru Matsuda, Masayuki Suzuki, Koei Yamamoto, Tomoaki Taniike, Daigo Tomono, Masahiro Takada, Edwin L. Turner, Kunio Takeshi, Yukie Oishi, Hironao Miyatake, Kazuhito Namikawa, H. Nakaya, Shoken Miyama, Tsang Chih Lai, Sogo Mineo, Norio Okada, Manobu M. Tanaka, Naoshi Sugiyama, Tsuyoshi Terai, James Bosch, Paul A. Price, Philip J. Tait, Shiang-Yu Wang, Yuki Okura, Yoshiyuki Doi, Hsin Yo Chen, Yoko Tanaka, Noboru Kawaguchi, Steve Bickerton, Tomoki Morokuma, Steward Smith, Cheng Lin Ho, and Yasuhito Miyazaki

Subjects
Physics, 010308 nuclear & particles physics, Space and Planetary Science, Image quality, business.industry, 0103 physical sciences, Systems design, Astronomy and Astrophysics, Instrumentation (computer programming), business, 010303 astronomy & astrophysics, 01 natural sciences, Computer hardware
Published
2017
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2. Long-term immobilization of strontium ions using zeolite A / calcium phosphate nanocomposites

Author

Yujiro Watanabe, Yasushi Suetsugu, Yoshinori Miwa, Toshiyuki Ikoma, Yu Komatsu, Junzo Tanaka, Yusuke Moriyoshi, and Hirohisa Yamada

Subjects
Strontium, Nanocomposite, Materials science, Ion exchange, Elution, Inorganic chemistry, chemistry.chemical_element, General Chemistry, Calcium, Condensed Matter Physics, Adsorption, Nanocrystal, Chemical engineering, chemistry, Materials Chemistry, Ceramics and Composites, Zeolite
Abstract

Zeolite A whose surface was evenly covered with tiny scaly calcium deficient hydroxyapatite (Ca-def HA) nanocrystals was prepared through the ion exchange reaction of ammonium and calcium ions as a novel encapsulation material for the long-term immobilization of radioactive Sr-90. The maximum capacity for Sr ion uptake in the zeolite A/Ca-def HA nanocomposite was determined to be 0.40 mmol g−1, which was comparable to the value for zeolite A alone; this was because of the loose arrangement of Ca-def HA nanocrystals on the surfaces. The nanocomposite obtained was heated at 800 to 1200°C to improve the solution stability of adsorbed Sr ions. The low crystalline Ca-def HA became tricalcium phosphate (TCP) after heating at over 850°C. A phase change from zeolite A to an amorphous phase was observed at 850°C and to feldspar at 1000°C. The elution of Sr ions from the nanocomposites heated was compared to those from the heated zeolite A, under alkaline conditions (pH 10.2) similar to those found in geological layers deeper than 300 m. The elution amounts of Sr ions from the nanocomposites decreased with heating temperatures over 950°C compared with those of zeolite A, due to the complete coverage of TCP crystals. These results indicate that calcium phosphate nano-layers on the zeolite A surfaces play an important role for the long-term encapsulation of Sr ions in the nanocomposites.

Published
2010

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