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717 results on '"Takahashi, Kuniaki"'

204. None

Author

Kato, Masato, Sugata, Hiromasa, Takahashi, Kuniaki, and Kamimura, Katsuichiro

Abstract

プルトニウム酸化物燃料に関する物性研究は、広範囲のPu富化度のMOX燃料について行われている。さらに、NpまたはGdを含有した燃料についても実施する計画があり、研究対象となる物質の系は複雑となっている。このようなプルトニウム酸化物燃料の物性研究を進める上で、試料のO/Mをコントロールすることは、得られた物性データの信頼性を高め、物性を正しく理解する上で重要である。本試験は、高温X線回折の測定及び酸素ポテンシャルをコントロールする技術を習得することを目的とし、30\%Pu富化度のMOXを用いて酸素ポテンシャルをコントロールし、高温X線回折による格子定数の測定を行った。また、高温X線回折装置による熱膨張率測定、変態速度の測定をも試みた。さらに、今回の試験により得られたデータをもとに、O/Mをコントロールするアニーリングの手法についての検討を行うとともに、既知の状態図の検討を行った。本試験により酸素ポテンシャルをコントロールした雰囲気下で高温X線回折測定を行うための実験手順について確立するとともに、Pu0.28U0.72O2$\pm$xについて以下のことがわかった。(1)800$^{\circ}C$以下の酸素ポテンシャルと相状態の関係について明らかにすることができ、雰囲気の酸素ポテンシャルをコントロールすることによって、MO2、MO2+x、MO2+x+M4O9、M4O9相の各相を得ることができるようになった。また、O/Mを2.00にコントロールするためのアニーリング方法を確立した。(2)MO2とM4O9相の熱膨張率を求め、それぞれ熱膨張係数を9.5$\times$10-6/$^{\circ}C$及び10.8$\times$10-6/$^{\circ}C$を得た。(3)MO2からM4O9相へ酸化するときの活性化エネルギを求め、78KJ/molを得た。(4)ハイパーストイキオメトリーの領域においてMO2+xとM4O9相の2相領域が従来報告されている状態図に比べ広い範囲である可能性を示唆した。, None

Published
1997

236. THORACOLUMBAR INTRADURAL DISC HERNIATION IN EIGHT DOGS: CLINICAL, LOW-FIELD MAGNETIC RESONANCE IMAGING, AND COMPUTED TOMOGRAPHIC MYELOGRAPHY FINDINGS.

Author

Tamura, Shinji, Doi, Shoko, Tamura, Yumiko, Takahashi, Kuniaki, Enomoto, Hirokazu, Ozawa, Tsuyoshi, and Uchida, Kazuyuki

Abstract

Intradural disc herniation is a rarely reported cause of neurologic deficits in dogs and few published studies have described comparative imaging characteristics. The purpose of this retrospective cross sectional study was to describe clinical and imaging findings in a group of dogs with confirmed thoracolumbar intradural disc herniation. Included dogs were referred to one of four clinics, had acute mono/paraparesis or paraplegia, had low field magnetic resonance imaging (MRI) and/or computed tomographic myelography, and were diagnosed with thoracolumbar intradural disc herniation during surgery. Eight dogs met inclusion criteria. The prevalence of thoracolumbar intradural disc herniation amongst the total population of dogs that developed a thoracolumbar intervertebral disc herniation and that were treated with a surgical procedure was 0.5%. Five dogs were examined using low-field MRI. Lesions that were suspected to be intervertebral disc herniations were observed; however, there were no specific findings indicating that the nucleus pulposus had penetrated into the subarachnoid space or into the spinal cord parenchyma. Thus, the dogs were misdiagnosed as having a conventional intervertebral disc herniation. An intradural extramedullary disc herniation (three cases) or intramedullary disc herniation (two cases) was confirmed during surgery. By using computed tomographic myelography (CTM) for the remaining three dogs, an intradural extramedullary mass surrounded by an accumulation of contrast medium was observed and confirmed during surgery. Findings from this small sample of eight dogs indicated that CTM may be more sensitive for diagnosing canine thoracolumbar intradural disc herniation than low-field MRI. [ABSTRACT FROM AUTHOR]

Published
2015
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237. Determination of I in the accumulated radioactive water and processed water of the Fukushima Daiichi Nuclear Power Plant.

Author

Shimada, Asako, Sakatani, Keiichi, Kameo, Yutaka, and Takahashi, Kuniaki

Subjects
FUKUSHIMA Nuclear Accident, Fukushima, Japan, 2011, RADIOACTIVE wastes, IODIDES, CHEMICAL sample preparation, INDUCTIVELY coupled plasma mass spectrometry
Abstract

Accumulated radioactive water (AW) and processed water (PW) were sampled from certain locations of the accumulated radioactive water processing facility at the Fukushima Daiichi Nuclear Power Plants, in order to estimate the radioactivity of the secondary waste such as zeolite and sludge, which adsorbed radioactive material. The method to separate iodide ion (I) from other radionuclides using the solid phase extraction sorbent, Anion SR, was optimized to measure the concentration of I in the AW and PW samples. After the chemical separation, the concentration of I in the sampled water was determined by inductively coupled plasma mass spectrometry with a dynamic reaction cell (DRC-ICP-MS). [ABSTRACT FROM AUTHOR]

Published
2015
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241. Enterolithiasis in a cat

Author

Yuki, Masashi, primary, Sugimoto, Noriko, additional, Takahashi, Kuniaki, additional, Ohtsuka, Hiromi, additional, Nishii, Naohito, additional, and Suzuki, Kiyomi, additional

Published
2006
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242. Differential microarray analysis of Drosophila mushroom body transcripts using chemical ablation

Author

Kobayashi, Masatomo, primary, Michaut, Lydia, additional, Ino, Ayako, additional, Honjo, Ken, additional, Nakajima, Taiki, additional, Maruyama, Yasushi, additional, Mochizuki, Hiroaki, additional, Ando, Mai, additional, Ghangrekar, Indrayani, additional, Takahashi, Kuniaki, additional, Saigo, Kaoru, additional, Ueda, Ryu, additional, Gehring, Walter J., additional, and Furukubo-Tokunaga, Katsuo, additional

Published
2006
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