著者

三木 孝史 斉藤 一功 林 征治 梶川 弘 嶋田 雅生 小川 陸郎 川手 剛雄 池谷 大 木村 則幸 高畠 和男 西澤 節 杉浦 伸裕 鈴木 基文

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.31, no.5, pp.258-266, 1996-05-25 (Released:2010-02-26)

参考文献数

14

被引用文献数

1 4

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So far, the use of superconducting magnets has been limited to chemical analysis and medical inspection. To develop a new use, we have tried to apply common MRI devices as nondestructive sugar content detector of watermelon. To estimate the sugar content, a new technique using multiple regression analysis of two NMR relaxation times was developed. It was found that the coefficient of multiple regression at the center of the watermelon exceeded 0.9 and the standard error of prediction was around 0.5, and that the over-ripened part of flesh called ‘nieka’ in watermelon could be distinguished because its T2 was much longer than that of the oridinary part. An evaluation rate of sugar content could be below 6s per watermelon. It is concluded that multiple analysis of T1 and T2 on intact watermelon can be applied as a non-invasive, nondestructive indicator of sugar content.

著者

長谷川 亮 森谷 健二 喜多 幸次 柳谷 俊一 山田 一雅 小川 陸郎

出版者

函館工業高等専門学校

雑誌

函館工業高等専門学校紀要 (ISSN:02865491)

巻号頁・発行日

vol.37, pp.19-24, 2003

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Since 2000, we have attempted to improve a method of leading and experimental theme in the fundamentals of electrical and electronic engineering laboratory I accompanying with a reorganization from dept. of electrical eng. to dept. of electrical and electronic Eng.. In the second-year class, instructions of how to write a technical report were also included into contents of the electrical and electronic experiment. In the present report, we investigated such a method of leading, the experimental system and other problems based on previous enquetes. As a result, it was judging that current experimental system: members of groups, volume of contents, were adequate for students. Additionally, the instruction of technical report was meaningful for the students and we could confirm the necessity of continuing the efforts. On the other hand, some problems: 1) student's preparations to experiments are not sufficient 2) students frequently depend on teacher's advices 3) teachers are not enough to explain evaluation system to students 4) whether experimental themes are really proper or not, were revealed. These examinations and improvements should be needed continuously in the future.