著者

玉城 敦子 中山 良朗 益崎 裕章 久高 将太 照屋 理子 本間 健一郎 屋比久 賢光 照屋 太輝 吉村 蘭 上原 盛幸 山城 清人

出版者

一般社団法人 日本内分泌学会

雑誌

日本内分泌学会雑誌 (ISSN:00290661)

巻号頁・発行日

vol.97, pp.56-58, 2021

著者

土井 宣夫 越谷 信 本間 健一郎

出版者

一般社団法人 日本活断層学会

雑誌

活断層研究 (ISSN:09181024)

巻号頁・発行日

vol.1998, no.17, pp.31-42, 1998-12-29 (Released:2012-11-13)

参考文献数

40

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The geology at the northern and western margin of the Shizukuishi basin is composed of upper Miocene Yamatsuda Formation, Pliocene Masuzawa Formation, Plio-Pleistocene Tamagawa Welded Tuffs and units from Takakura and Iwate volcanoes, in ascending order. The geological structure of the margin is characterized by the Nishine fault system, which displaces these formations and units. The fault system, a set of west-dipping reverse faults, forms the topographic and geologic boundary between the Ou Backbone Range and the Shizukuishi basin, and it controls the vertical position of underlying units as well as Takakura and Iwate volcanic products. The vertical displacement of the Shibutami Welded Tuff, which is included in the Tamagawa Welded Tuffs and erupted between 0.7and 1.0 Ma, decreases to the north and south from an area where the tuff has been vertically offset some 300-400 m, for an average displacement of about 0.4 mm/yr. Slip occurred on the northern part of the fault system during the Iwate-ken Nairiku-hokubu earthquake of September 3,1998. The tuff is also displaced at least 250 m along the Matsuo fault for an average displacement of about 0.25mm/yr at the north of the Nishine fault system. This reverse fault strikes nearly parallel to the Nishine fault system and can be traced for 5 km.

著者

山田 一夫 羽原 俊祐 本間 健一

出版者

公益社団法人 日本コンクリート工学会

雑誌

コンクリート工学論文集 (ISSN:13404733)

巻号頁・発行日

vol.9, no.2, pp.91-99, 1998-07-17 (Released:2012-11-13)

参考文献数

11

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The false setting of cement caused by the aeration was studied from the analysis of the cement characters, its hydraulic reactivity, its hydration reaction, the paste rheological properties and the relationship among them. The aeration of cement was simulated by the treatment of cement exposing under an environment of temperature, 20°C and relative humidity, 80%. With a longer treatment, cement showed larger amounts of ignition loss. Hydration products with particle sizes under 0.3 μ m were formed on cement particles and the amount was increased with the increase of treatment time. Although the treatment did not change the Blaine specific surface area, it changed the BET specific surface area as much as 1.4 times higher during seven days of treatment. The treatment significantly decreased the hydration reactivity of interstitial phases of cements. The treatment longer than certain period of time brought a false setting in cements, which was not occurred in fresh cement paste. When aerated cements was mixed with water, sulfate ion was supplied to liquid phase from alkaline sulfates or calcium sulfate hemihydrate. However, the sulfate ion was not consumed by the ettringite formation reaction because of the low reactivity of interstitial phases. As the results of poor consumption of sulfate ion, gypsum crystals deposited from liquid phase to form large automorphic plate crystals and finally cement paste was thought to show the false setting, i.e. plaster set.