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Cohesive bond strength of marine aggregates and its role in fragmentation
No full textMarine aggregates are one of the main contributors to carbon sequestration in the deep sea through the gravitational settling of biogenic particles formed from the photosynthetic products of phytoplankton. The formation of large particles due to aggregation processes has been the focus of studies in the past, but recent findings on the spatio-temporal distribution of particles suggests that the fragmentation of aggregates plays an important role in aggregate dynamics. Here, we assessed the yield strength of aggregates derived from natural planktonic communities in order to analyze the cohesive bond strength and further understand fragmentation. The experimental approach was designed around the use of a Couette device, which produces a constant laminar shear flow of water. Aggregates were found to have a higher yield strength (~289 ± 64 nN) during phases of nutrient depletion than those of mineral particles such as montmorillonite. Based on an estimated cohesive bond strength of 96 nN a numerical model to predict the temporal variation of aggregate size was created. The output of this model indicates that cohesive bond strength is a major determinant of the size of aggregates in motion. Our findings suggest that the dynamics of marine aggregates are greatly influenced by cohesive bond strength and the role in fragmentation.journal articl
Search for a long-lived spin-0 mediator in b → s transitions at the Belle II experiment
No full textjournal articl
【内容の要旨及び審査の結果の要旨】セリ科香辛植物に含まれる機能性成分の解明
Get PDF奈良女子大学博士(学術)博士論文本文はやむを得ない事由により非公開。【博士論文本文の要約】http://hdl.handle.net/10935/5962doctoral thesi
久保天随の中国「女流文学」史観:謝无量と梁乙真の女性文学史からの受容
Get PDF規定により本文ファイルは発行から6ヶ月後の2023年9月7日に公開departmental bulletin pape
内地雑居後における言語問題、あるいは明治二十年における未来語りの想像力
Get PDF規定により本文ファイルは発行から6ヶ月後の2023年9月7日に公開departmental bulletin pape
1950年代前半の保健教科書研究のための参考資料(5)-1:1953年の中学校保健学習内容案に準拠した教科書(1):1954年検定のもの
Get PDF日本保健科教育学会第8回研究大会(2023年12月17日, 鎌倉女子大学)講演用資料(功刀俊雄)conference objec