著者

市川 宏 武田 道夫 瀬口 忠男 岡村 清人

出版者

公益社団法人 日本金属学会

雑誌

まてりあ (ISSN:13402625)

巻号頁・発行日

vol.39, no.2, pp.190-192, 2000-02-20 (Released:2011-08-11)

参考文献数

4

被引用文献数

3

著者

上田 正 武田 道夫

出版者

公益社団法人 日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.43, no.9, pp.1115-1121, 1977-09-25 (Released:2008-02-29)

参考文献数

5

被引用文献数

3 4

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The results of methyl mercury (MeHg) analyses of the muscle tissues and the livers of 39 specimens of yellowfin tuna, Thunnus albacares, from the Middle Pacific, the West pacific, and the East Indian Oceans are presented.The correlations between the levels of MeHg and total mercury (T-Hg) were signiflcant (at 0.01 level) in both muscle tissues and liver. The difference between the MeHg and the T-Hg levels was insignificant (at 0.01 level) by t-test in both dark muscle and liver. On the other hand, the MeHg levels of dorsal muscle were significantly lower than the corresponding T-Hg levels, the difference being approximately 0.04μg/g. The level of MeHg in dark muscle and liver, respechively, correlated significantly with that of dorsal muscle (at 0.01 level). The dark muscle contained a higher level of MeHg than the dorsal muscle, the difference being about 0.03μg/g, while the liver contained less than either (about 0.07μg/g). On the basis of the statistical evaluation described above, the order of mercury levels among the muscles and the liver was estimated as follows; T-Hg of dorsal muscle≈T-Hg of dark muscle≈MeHg of dark muscle>MeHg of dorsal muscle>MeHg of liver≈T-Hg of liver.

著者

下尾 聰夫 早津 俊秀 成澤 雅紀 武田 道夫 市川 宏 瀬口 忠男 岡村 清人

出版者

公益社団法人日本セラミックス協会

雑誌

日本セラミックス協会学術論文誌 : Nippon Seramikkusu Kyokai gakujutsu ronbunshi (ISSN:18821022)

巻号頁・発行日

vol.101, no.1180, pp.1379-1383, 1993-12-01

被引用文献数

10 10

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The pyrolysis of the low oxygen (1.7% O) SiC fiber prepared by the electron-irradiation curing method has been investigated. The pyrolytic rate was measured with a thermobalance in Ar at temperatures from 1673 to 1973K. The pyrolyzed fiber was examined by X-ray diffraction, SEM observation, specific resistance measurement and tensile test. Lowering of oxygen content in the fiber was found to be effective for the suppression of pyrolysis. The pyrolyzed fiber was composed of β-SiC and amorphous carbon. The growth and coarsening of SiC crystals were observed on the skin of the fiber, while the core was smooth and remained in the microcrystalline state. The tensile strength of the fiber, which was heated at 1973K for 3.6ks, retained 34% of that of the original fiber. The strength was correlated closely with the size of the β-SiC crystal in the fiber.