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5 results on '"Yuuji Onda"'

1. Abstracts from the Japanese Journal of Limnology

Author

Yuuji Onda, Shinji Ohsawa, Nobuki Takamatsu, Takeshi Sonoda, Shigeru Nakao, Satoru Kiyoshige, Susumu Chiba, Yoko Yamamoto, Toko Yamamoto, Hiroko Toda, Kazuko Morikawa, Yasuaki Okumura, Shuichi Endoh, Mikiya Hiroki, Toru Yabe, Seiichi Nohara, Hirokatsu Utagawa, Kiyoshi Satake, Tsunenori Koga, Ryuhei Ueno, Masanobu Kawachi, Makoto M. Watanabe, Yukimi Katagami, Keisuke Nakayama, Ho-Sub Kim, Sayoko Yonedzuka, Ho-Dong Park, Hiroki Haga, Taisuke Ohtsuka, Kanako Ishikawa, Shigeo Tsujimura, Hiroyuki Nakahara, Michio Kumagai, Kana Hanabishi, and Tohru Yabe

Subjects
Ecology, Aquatic Science, Water Science and Technology
Published
2004
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2. A colorimetric and geochemical study of the coloration factor of hyper-acid active crater lakes

Author

Nobuki Takamatsu, Yuuji Onda, and Shinji Ohsawa

Subjects
Ecology, Impact crater, Chemistry, Mineralogy, Aquatic Science, Water Science and Technology
Abstract

本研究では,白濁したエメラルドグリーンを呈する日本の代表的な活動的強酸性火口湖である阿蘇山中岳の湯だまり,草津白根山の湯釜において,色彩測定,水質分析,浮遊物質(単体硫黄)の粒度分布測定を行い,それらの結果に基づいて呈色因子および呈色機構について考察した。火口湖水に浮遊する単体イオウの粒度分布は,青白色を呈する合成イオウコロイド溶液のそれと類似し,レイリー散乱(青色)とミー散乱(乳白色)に関与するイオウコロイドの存在を確認した。色彩計を用いた色の測定結果は,火口湖の呈色がイオウコロイドによる入射太陽光の散乱によるものだけではなく,溶存するFe2+の太陽光の吸収による呈色が合わさっていることを示した。

Published
2003
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3. Erratum to: Abstracts from the Japanese Journal of Limnology

Author

Kana Hanabishi, Susumu Chiba, Mikiya Hiroki, Kanako Ishikawa, Kiyoshi Satake, Makoto M. Watanabe, Yuuji Onda, Shuichi Endoh, Masanobu Kawachi, Sayoko Yonedzuka, Yasuaki Okumura, Satoru Kiyoshige, Tsunenori Koga, Ho-Sub Kim, Toko Yamamoto, Takeshi Sonoda, Tohru Yabe, Toru Yabe, Shinji Ohsawa, Ho-Dong Park, Seiichi Nohara, Hirokatsu Utagawa, Taisuke Ohtsuka, Kazuko Morikawa, Hiroko Toda, Nobuki Takamatsu, Keisuke Nakayama, Yoko Yamamoto, Yukimi Katagami, Ryuhei Ueno, Hiroki Haga, Michio Kumagai, Shigeru Nakao, Shigeo Tsujimura, and Hiroyuki Nakahara

Subjects
History, Ecology, Limnology, Ecology (disciplines), Library science, Environmental ethics, Aquatic Science, Water Science and Technology
Abstract

The Japanese Journal of Limnology is another official publication of the Japanese Society of Limnology. The original papers in the journal were peer-reviewed by a few authorized referees, and appeared in Japanese with English abstracts.

Published
2004
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4. A colorimetric and geochemical study of the coloration factor of hyper-acid active crater lakes.

Author

Yuuji Onda, Shinji Ohsawa, Nobuki Takamatsu, Takeshi Sonoda, Shigeru Nakao, Satoru Kiyoshige, Susumu Chiba, Yoko Yamamoto, Toko Yamamoto, Hiroko Toda, Kazuko Morikawa, Yasuaki Okumura, Shuichi Endoh, Mikiya Hiroki, Toru Yabe, Seiichi Nohara, Hirokatsu Utagawa, Kiyoshi Satake, Tsunenori Koga, and Ryuhei Ueno

Subjects
ANALYTICAL geochemistry, RAMAN spectroscopy, MIE scattering, ELECTROMAGNETIC wave scattering
Abstract

Coloration factor and coloration mechanism of the Yudamari crater lake on Mt. Aso and the Yugama crater lake on Mt. Shirane, which are typical hyper-acid crater lakes in Japan and that were observed to be cloudy emerald green in color, are discussed using data from color measurements, chemical analyses of lake waters and the grain-size distribution of suspended elemental sulfur. The grain-size distribution of elemental sulfur in the crater lakes, which is formed by the reaction of SO 2(aq) and H 2S (aq) originating from the bottom fumaroles, was seen to agree with that of a synthetic colloidal sulfur solution when it turned bluish white. The existence of colloidal sulfur particles involved in Rayleigh scattering and Mie scattering was confirmed. Color measurements using a colorimeter showed that the coloration of the crater lakes is not only caused by the scattering of sunlight by colloidal sulfur particles, but also by the absorption of sunlight by dissolved ferrous ion. [ABSTRACT FROM AUTHOR]

Published
2004

5. Axial vibration of metal flexible couplings

Author

Shigeo Yanabe, Toshiharu Okazaki, and Yuuji Onda

Subjects
Metal, Materials science, Mechanics of Materials, Mechanical Engineering, Axial vibration, visual_art, visual_art.visual_art_medium, Composite material, Industrial and Manufacturing Engineering
Published
1987
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