著者
兒玉 昂幸 白石 日出人 渕上 哲
出版者
福岡県水産海洋技術センター
雑誌
福岡県水産海洋技術センター研究報告 Bulletin of Fukuoka Fisheries and Marine Technology Research Center (ISSN:09192468)
巻号頁・発行日
no.24, pp.13-23, 2014-06

福岡県有明海区の河口域漁場では,ノリ網に付着したノリ葉体が数日で消失する現象が以前から発生しており、生産性の低い漁場となっている。しかし、河口域漁場は栄養塩が豊富にあり、ノリの色落ちが起きにくいため、原因を特定し有効な対策を講ずれば,ノリの生産性を向上させることができると考えられた。そこで,ノリ葉体消失の原因と考えられる低塩分海水による影響と藻食性動物の食害について検討を行ったところ,現場においてカモの摂食を確認し,消化管からもノリが見られた。また,カモの侵入を防ぐための囲い網を設置したノリ網では,消失は発生しないことが確認された。以上のことから,ノリ葉体消失はカモ類による食害が原因であり,カモ類のうち特にオナガガモとヒドリガモによる影響が大きいことが明らかとなった。
著者
菅原 啓 高橋 節子
出版者
THE TOHOKU GEOGRAPHICAL ASSOCIATION
雑誌
東北地理 (ISSN:03872777)
巻号頁・発行日
vol.26, no.1, pp.11-21, 1974 (Released:2010-04-30)
参考文献数
24
被引用文献数
1

Geomorphic surfaces in Tôno Basin are composed of Tôno gentle slope-I (Tg-I), Tôno gentle-slope-II (Tg-II), Tôno terrace (Tt) and alluvial plain.The highest surface, Tg-I, is the oldest and erosional one shaved the deep-weathered granitic rocks, which is covered with thin fragmentary deposits red-weathered in their lower part. Denudation of base rocks have brought talus-like or fan-like deposits consist of gravel and sand at the foot of Tg-I. Perhaps it occurred in a stage of slope-instability before the Würm maximum, and then chemical weathering of gravel bed, or red-weathering of slope deposits on Tg-I, followed under the warmer climatic condition.The terrace (Tt), the lowest surface, was continually formed under periglacial condition through the Würm maximum to the next warmer period (the Alleröd Stage?). The terrace deposits consist of solifluction products along the Sarugaishi River in the west, of fluvial products like fan deposits on the right of the Hayase River in the south, and of intermingled deposits of solifluction and fluvial products along the Ogarase River in the north, as well as on the left of the Hayase and the Rainai in the south-west.Thereafter, Tg-II was formed under the cold climate probably of the last substage in the Würm, as depositional gentle slope with solifluction products, overlying the Tt surface.Alluvial plain has been developed since the Holocene, resulted from the swinging and shifting of river channels.There are some regional patterns in distribution and materials of these geomorphic surfaces, especially of Tg-II and Tt. The area along the Sarugaishi River is colluvial in character, the area on the right of the Hayase River is fluvial, and the area along the Ogarase River, on the left of the Hayase and the Rainai River, is colluvio-fluvial.

1 0 0 0 法学と憲法

著者
末川博, 天野和夫 共著
出版者
大明堂
巻号頁・発行日
1966
著者
福島 正己 吉田 滋
出版者
一般社団法人 日本物理学会
雑誌
日本物理学会誌 (ISSN:00290181)
巻号頁・発行日
vol.55, no.12, pp.924-932, 2000-12-05 (Released:2008-04-14)
参考文献数
21

地球に降り注ぐ宇宙線には極めてエネルギーの高いものがあって,1020電子ボルトを超えるものが,これまでに8例発見されている.超高エネルギーの宇宙線は,3Kの背景放射に遮蔽されて3億光年より長い距離を伝播することはできないから,これらの宇宙線は銀河系近傍の天体で加速されたと考えるのが自然であるが,その到来方向には加速源となる高エネルギーの天体が見つからない.この矛盾を説明するために,宇宙紐,磁気単極子,寿命の長い超重粒子などの崩壊による2次粒子起源説,あるいは特殊相対論の破れなど,宇宙論や素粒子論に関連した仮説が提案されている.宇宙線望遠鏡(Te1escope Array)計画は,米国ユタ州の砂漠に空気シャワーの発生する大気蛍光を検出する反射望遠鏡群を設置し,数万平方キロの領域に到来する超高エネルギーの宇宙線を観測する.これによって宇宙線のエネルギー・到来方向・粒子種を精密に決定し,超高エネルギー宇宙線の発生起源解明を目指す.
著者
鳥居 祥二 槙野 文命
出版者
一般社団法人 日本物理学会
雑誌
日本物理学会誌 (ISSN:00290181)
巻号頁・発行日
vol.56, no.1, pp.8-16, 2001-01-05 (Released:2008-04-14)
参考文献数
20

宇宙線の研究は,粒子の生成・消滅という素粒子物理学または原子核物理学と,粒子の加速・伝播という宇宙物理学の視点から行われている.観測される宇宙線の組成やスペクトルは両者が複雑に絡み合った現象である.広いエネルギー領域で多種類の粒子の識別とエネルギーの決定を行う必要があり,様々な検出器が考案されて,地上および気球,人工衛星による観測が実施されている.国際協力で建設が進められている宇宙ステーションは,各国が宇宙空間に露出した宇宙線観測に適したサイトを準備しており,特色ある観測装置の搭載が計画されている.本稿ではこれらの装置の概要とその観測計画について解説する.
著者
中川 理
出版者
日本建築学会
雑誌
日本建築学会計画系論文集 (ISSN:13404210)
巻号頁・発行日
vol.76, no.662, pp.859-868, 2011-04-30 (Released:2011-07-29)
被引用文献数
1

This paper clarifies the roles played by government officials specialized in civil engineering in urban reform during the Meiji era in Japan. This clarification was made by studying the process until the initiation of the urban reform projects titled the Three Major Projects in Kyoto city, which were completed in 1912, as a case example for analysis. In the process of analysis, I clarified the emergence of two types of engineers according to differences in the roles they played. One is the engineer who developed the mayor's urban reform concept into a specific design plan. Not having studied modern technology, the engineer made a mistake in the design of civil engineering projects that required advanced technology, and the person was held responsible for the mistake in the city council. This incidence led to the appearance of another type of engineer. This engineer graduated from the Department of Civil Engineering of Kyoto Imperial University and mastered modern civil engineering. He then attempted to take initiative in council reform using his advanced knowledge.
著者
覺本 真代 坂本 靖英 米田 純 片桐 淳 青木 一男 瀧口 晃 安井 彩 森 二郎
出版者
一般社団法人 資源・素材学会
雑誌
Journal of MMIJ (ISSN:18816118)
巻号頁・発行日
vol.134, no.1, pp.1-12, 2018-01-25 (Released:2018-01-24)
参考文献数
38
被引用文献数
1

Depressurization process is regarded as the most effective process for gas recovery method from the viewpoints of gas productivity and economic efficiency among in-situ dissociation processes of Methane Hydrate (MH) existing in marine sediments. However, it is supposed that consolidation and deformation of the stratum occurs due to MH dissociation and increase of effective stress in the stratum during operation of depressurization. Consolidation and deformation wreak negative friction on the production well. As a result, the production well may suffer large compressive or tensile stress. In the worst case, it may cause shear failure, tension failure and crushing. Therefore, for optimization of gas production process by depressurization, it is necessary to perform numerical simulation in consideration of a series of phenomenon during MH dissociation in porous media and evaluate the effect of consolidation deformation of the stratum on MH production well. In this study, using the geo-mechanical simulator named as COTHMA developed under MH21 research consortium, we carried out the field-scale numerical simulation for prediction of deformation and stress distribution around production well during depressurization. On the basis of field data for the Eastern Nankai Trough area and the structure of production well for the methane hydrate first offshore production test in 2013, the detailed model for reservoir and production well was constructed. In addition, we conducted push-out test to evaluate the frictional behavior at the interface between screen-gravel pack as the different materials constituting production well and introduced into numerical model for COTHMA. From calculation results, it was found that Mises stress occurring on base pipe installed into the interval of depressurization reached 420 MPa as yield point of steel due to the effect of friction. However, the original shape was maintained because the occurred equivalent plastic strain was about 2.95 % and this strain value was much smaller than 21 % as failure criterion. Furthermore, the effect of interface between casing and cementing was not large. This result suggested that the well structure above the interval of depressurization acted as unit and the interfacial frictional behavior between well and layer was the dominant factor on deformation behavior and stress distribution of casing and cementing.

1 0 0 0 OA 地下家伝

著者
[三上景文 著]
出版者
日本古典全集刊行会
巻号頁・発行日
vol.第27-33 附録1・目録1, 1938