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Kazuhisa A. Chikita, Hideo Oyagi and Kazuhiro Amita
A thermal system in the very deep Lake Tazawa (maximum depth, 423 m) was investigated by estimating the heat budget. In the heat budget estimate, the net heat input at the lake?s surface and the heat input by river inflow and groundwater inflow were cons...
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Kazuhisa A. Chikita, Akio Goto, Jun Okada, Takashi Yamaguchi and Hideo Oyagi
Exploring how the hydrological and thermal conditions of a volcanic lake change in response to volcanic activity is important to identify the signs of a volcanic eruption. A water cycle system and a geothermal process in a crater lake, Okama, in the acti...
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Kazuhisa A. Chikita, Akio Goto, Jun Okada, Takashi Yamaguchi, Satoshi Miura and Mare Yamamoto
The Okama Crater Lake is located in the highly active Zao Volcano on the boundary of Miyagi and Yamagata Prefectures, Japan. At present, the lake stays relatively calm with neither bubbling, steaming nor gas smell at a pH of 3.2?3.4, though the lake did ...
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Kazuhisa A. Chikita, Tomoyuki Wada, Isao Kudo, Sei-Ichi Saitoh and Mitsuhiro Toratani
In the Bering Sea around and off the Yukon River delta, surface sediment plumes are markedly formed by glacier-melt and rainfall sediment runoffs of the Yukon River, Alaska, in June? September. The discharge and sediment load time series of the Yukon Riv...
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Ken Wakimoto, Kazuhisa Chiba, Hiroyuki Kato and Kazuyuki Nakakita
This study conducted wind tunnel tests with consecutive deflection angle changes on a three-dimensional (3D) wing with a control surface to procure aerodynamic data by sweeping the deflection angle. Configuration changes of a wind tunnel test model, such...
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Kazuhisa Chiba, Tatsuro Komatsu, Hiroyuki Kato and Kazuyuki Nakakita
We have developed a remote and precise feedback control system using optical measurement technology to alter the angle of a flap, which is part of a wind tunnel test model, automatically and to earn the aerodynamic data efficiently. To rectify the wastef...
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Kazuhisa Chikita, Yasuhiro Ochiai, Hideo Oyagi and Yoshitaka Sakata
Kuttara Volcano, Hokkaido, Japan, consists of temperate Lake Kuttara and the western Noboribetsu geothermal area. In order to explore geothermal relations between Lake Kuttara and the geothermal area, the heat budget of a hydrothermal pond, Okunoyu, was ...
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Ryunosuke Ogawa, Masahiro Hirata, Birhane Gebreanenia Gebremedhin, Satoshi Uchida, Toru Sakai, Kazuhisa Koda and Koichi Takenaka
The search for a sustainable land management has become a universal issue. It is especially necessary to discuss sustainable land management and to secure a site with enough feed supply to improve the lives of the farmers in the Ethiopian Highlands. This...
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Kazuhisa A. Chikita, Hideo Oyagi, Tadao Aiyama, Misao Okada, Hideyuki Sakamoto and Toshihisa Itaya
A deep temperate lake, Lake Kuttara, Hokkaido, Japan (148 m deep at maximum) was completely ice-covered every winter in the 20th century. However, ice-free conditions of the lake over winter occurred three times in the 21st century, which is probably due...
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Yu Zou, Da-Hong Wang, Noriko Sakano, Yoshie Sato, Suketaka Iwanaga, Kazuhisa Taketa, Masayuki Kubo, Kei Takemoto, Chie Masatomi, Kiyomi Inoue and Keiki Ogino
Retinol, a-tocopherol, and ?-tocopherol are fat-soluble vitamins acting as antioxidants via the prevention of lipid oxidation. Little is known about circulatory levels in healthy individuals. The present cross-sectional study aimed at elucidating the rel...
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