5 0 0 0 OA オオベソオウムガイの筋肉部構造とその観察に基づく沈降機構に関する仮説
- 著者
- 川本 信之 三上 進
- 出版者
- 日本貝類学会
- 雑誌
- 貝類学雑誌 (ISSN:00423580)
- 巻号頁・発行日
- vol.37, no.4, pp.230-239, 1978-11-30 (Released:2018-01-31)
It is reported that the Nautilus makes a diel vertical migration from a depth of about 500 m up to the near-surface of the sea. However, it is axiomatic that such a long-ranged migration within a short period of the time cannot be managed by only water-jet propulsion through the hyponome. There has been a number of early works for elucidating how the animal is possible to make this migration, but no satisfactory solution has been obtained so far. Through an anatomical observation on muscle part of Nautilus macromphalus, we could speculate that two major retractors, namely, funnel and cephalic, may be involved in downward migration. Our hypothesis is that the contraction of these two retracting muscle will create a pressure in a sea water intaken in the mantle cavity and this pressure may be transmitted (through unknown mechanism) to the siphuncle. If so, the gas contained in other chamber could be compressed and makes the specific gravity of animal increased.
1 0 0 0 もえる聖火
- 著者
- 川本信正 多田信作執筆
- 出版者
- 黎明書房
- 巻号頁・発行日
- 1965
1 0 0 0 みんなの力で
- 著者
- 川本信正 黒崎貞治郎 多田信作執筆
- 出版者
- 黎明書房
- 巻号頁・発行日
- 1965
1 0 0 0 オリンピック史
- 著者
- 鈴木良徳川本信正共著
- 出版者
- 日本出版協同
- 巻号頁・発行日
- 1952
1 0 0 0 人はなぜ走るのか : 絵で見るランニング史
1 0 0 0 スポーツ賛歌 : 平和な世界をめざして
1 0 0 0 日本におけるオウムガイ類飼育研究の進展
- 著者
- 浜田 隆士 奥谷 喬司 棚部 一成 出口 吉昭 福田 芳生 波部 忠重 平野 弘道 蟹江 康光 川本 信之 三上 進 小畠 郁生
- 出版者
- 日本貝類学会
- 雑誌
- 貝類学雑誌 (ISSN:00423580)
- 巻号頁・発行日
- vol.37, no.3, pp.131-136, 1978
Progress and some results of the second rearing experiment of Nautilus macromphalus in Tokyo are described. The temperature controlling experiment is still applying to three extant individuals, that were supplied from New Caledonia last year through the courtesy of the ORSTOM in Noumea, and they are surviving for 222 days in captivity (May 14, 1978). Copulating behaviors are observed mostly in the waters of 17-19℃ in temperature but not in the cooler conditions. Shell growth at the apertural periphery was first measured to find that some individuals probably in a gerontic stage show no remarkable increment on one hand, the young specimens show 10-12 mm elongation per 100 days on the other. Recently the JECOLN also takes care of a living Nautilus pompilius that had been floated possibly from the Philippines along the Kuroshio Current over 2, 000 km and was captured by a fishing net set off Kawajiri, Kagoshima Prefecture in Kyushu, Southwest Japan.
1 0 0 0 OA アルミニウム溶湯中へのシリカ粒子添加によって引き起こされる諸現象
- 著者
- 辻川 正人 橋本 哲 川本 信
- 出版者
- 公益社団法人 日本鋳造工学会
- 雑誌
- 鋳物 (ISSN:00214396)
- 巻号頁・発行日
- vol.64, no.8, pp.526-530, 1992-08-25 (Released:2011-06-25)
- 参考文献数
- 7
- 被引用文献数
- 6
Thermit reaction was induced in molten aluminium silicon alloy by addition of coarse silica particles with stirring. Exothermic reaction commenced in the Al-Si eutectic melt at 1023 K. All silica particles were reduced into silicon in a brief period. Reduced silicon resolved into matrix melt. This thermit reaction produced α-alumina particles. These oxides were as large as added silica particles. After solidification, microstructures of specimens exhibited eutectic matrix, large primary silicon crystals and the oxide particles. A series of experiments were executed with magnesium addition before silica particles mixing. Magnesium quickened the dispersion of silica particles into matrix melt. So the thermit reaction occurred more rapidly and the highest temperature attained by the reaction was higher than those attained by the experiments without magnesium addition. The oxide particles resulted by experiments with magnesium showed a proof that the thermit reaction took place from outside to inside of silica particles gradually under high temperature.