著者
小出 貴宏 熊谷 直紀 佐藤 健輔 田村 宏司 河原 健太郎 播磨 賢司 福島 忠徳 橋本 英一 杉木 光輝 竹ヶ原 春貴
出版者
一般社団法人 日本機械学会
雑誌
スペース・エンジニアリング・コンファレンス講演論文集 2003.11 (ISSN:24243191)
巻号頁・発行日
pp.15-20, 2003-01-23 (Released:2017-06-19)

Pulsed Plasma Thrusters (PPT) using Teflon as solid propellant has characteristics of simplicity, lightweight, and high durability in recent years. Therefore, PPT propulsion system has the advantages for the small, micro-and nano-satellite attitude control. Tokyo Metropolitan Institute of Technology (TMIT) has started R & D on PPT system with the collaboration of NASDA. This paper describes its present status of the R & D. In the BBM phase, we tested that hood angle and electrode material was changed. In this result, we have researched optimum performance of TMIT-PPT. Now we have shifted from BBM-phase to EM-phase.
著者
山城 晶弘 神谷 直紀 大塚 薫 駒津 和浩 伊東 洋一 久保田 展聡 小林 正人
出版者
公益社団法人 日本放射線技術学会
雑誌
日本放射線技術学会雑誌 (ISSN:03694305)
巻号頁・発行日
vol.69, no.2, pp.163-169, 2013-02-20 (Released:2013-03-01)
参考文献数
13
被引用文献数
2

In magnetic resonance imaging (MRI), the ideal phantom should have similar T1 and T2 values to those of organs of interest for measuring the change in signal intensity, contrast ratio and contrast noise ratio. There have been several reports to develop such a phantom using materials with limited availability or complex methods. In this study, we have developed a simple phantom using indigestible dextrin and soluble calcium at 1.5-tesla MRI. The T1 and T2 values have been reduced by dissolving indigestible dextrin and soluble calcium in distilled water. The similar T1 and T2 values to those of organs (i.e., kidney cortex, kidney medulla, liver, spleen, pancreas, bone marrow, uterus myometrium, uterus endometrium, uterus cervix, prostate, brain white matter, and brain gray matter) have been obtained by varying the concentration of indigestible dextrin and soluble calcium. This phantom is easy to develop and has a potential to increase the accuracy of MRI phantom experiments.
著者
三谷 直紀 森本 敦志
出版者
神戸大学
雑誌
國民經濟雜誌 (ISSN:03873129)
巻号頁・発行日
vol.202, no.3, pp.33-50, 2010-09