Open Access Collection of International and Scholarly Papers
Open Access Collection of International and Scholarly PapersNot a member yet
3077 research outputs found
Sort by
高周波通電加熱による南極オキアミ Euphausia superba ブロックのテンパリングに関する研究
Full text link東京海洋大学博士(海洋科学)東京海洋大学博士学位論文 2024年度(2025年3月) 応用生命科学 課程博士 甲722号指導教員: 福岡美香doctoral thesi
沖縄本島定置網漁場における漁獲傾向に関する研究
Full text link東京海洋大学博士(海洋科学)東京海洋大学博士学位論文 2024年度(2025年3月) 応用環境システム学 課程博士 甲725号指導教員: 根本雅生doctoral thesi
Relationship between the Particle Size and the Oxidative Stability of Aqueous Emulsion Prepared from Triacylglycerol Rich in Docosahexaenoic Acid
No full textThe oxidative stability of polyunsaturated fatty acid (PUFA) generally decreases with increasing unsaturation, however, the opposite results have been reported for aqueous emulsions prepared from PUFA. One study showed that among PUFA (fish oil) emulsions with varying μm-sized particles, the smaller emulsions had better oxidation stability. Thus, particle size may be involved in the mechanism behind the improved oxidative stability of PUFA by emulsification, and PUFA emulsions with even smaller particle sizes (i.e., nm-sized) may exhibit higher stability. To evaluate these hypotheses, once optimizing conditions under which emulsions with different sizes (100-250 nm) can be prepared using docosahexaenoic acid (DHA)-rich algal oil (DAO), these emulsions were subjected to thermal oxidation (40°C, 5 days under light shielding). Based on peroxide value (POV) data, it is apparent that even DHA, which is particularly prone to oxidation, becomes less susceptible to thermal oxidation when emulsified, and that smaller emulsions lead to greater oxidative stability. The high oxidation stability in the smallest emulsion remained high after removal of the antioxidants (tocopherols) from this emulsion. Considering these results together with preliminary data on triacylglycerol (TG) mono-hydroperoxides measured by high performance liquid chromatography-tandem mass spectrometry (LC-MS/MS), the physical properties of the emulsion might account for the greater oxidative stability in smaller emulsions, probably due to the rapid termination of the oxidation reaction within the smaller particle in a more substrate-dense environment, rather than to the action of antioxidant tocopherols. Further research will hopefully lead to a solution to the longstanding problem of oxidation of PUFA such as DHA, which has a variety of benefits.公開日: 2025-08-01journal articl
3次元加工管外におけるR1234ze（E）の流下液膜蒸発に及ぼす蒸発温度の影響
No full textThe present study experimentally investigated the effects of evaporation temperature on falling liquid-film evaporation heat transfer coefficients and flow pattern using R1234ze(E) on a horizontal microscopic-grooved copper tube. The experiments were carried out at evaporation temperatures of 15°C and 25°C, heat flux range of 5-40 kWm-2, and film Reynolds number range of 100-900. As film Reynolds number increased, the flow pattern shifted from droplets-columns mode, columns mode, columns-sheet mode, and sheet mode. The effect of evaporation temperature on the film Reynolds number at which the flow pattern transitions were small. The evaporation heat transfer coefficient at 25°C was higher than that at 15°C for all film Reynolds numbers. At q=10 kWm-2, the evaporation heat transfer coefficients at 25°C were higher than those at 15°C, especially in the low film Reynolds number range. For both evaporation temperature conditions, the heat transfer coefficient increased with increasing heat flux. The heat transfer coefficients obtained in this study were 4 to 7 times higher than the predicted values calculated by existing correlations for pool boiling heat transfer on horizontal smooth tubes. The effect of differences in evaporation temperature on the heat transfer coefficient of the microscopic-grooved copper was similar to that of pool boiling in a smooth tube.公開日: 2023-11-08journal articl
中高速域で航走する小型船舶における燃料消費特性の推定手法
Full text link東京海洋大学修士(工学)東京海洋大学修士学位論文 2025年度(2025年9月) 海洋システム工学 修士 第4658号指導教員: 木船弘康全文公表年月日: 2025-12-18master thesi
2023/2024 Annual Cruise Report of the T/V Shinyo Maru Voyage : Fiscal Year 2023 Cruise Report
Full text linkdepartmental bulletin pape
2023/2024 Annual Cruise Report of the T/V Shioji maru Voyage : Fiscal Year 2023 Cruise Report
Full text linkdepartmental bulletin pape
補正情報のアベイラビリティ及び精度から鑑みたPPPの将来性について
Full text link東京海洋大学博士(工学)東京海洋大学博士学位論文 2024年度(2025年3月) 応用環境システム学 課程博士 甲第729号指導教員: 久保信明全文公表年月日: 2025-05-21doctoral thesi
日本におけるコンテナ共同利用による国際物流の効率化に関する研究
Full text link東京海洋大学博士(工学)東京海洋大学博士学位論文 2024年度(2025年3月) 応用環境システム学 課程博士 甲第731号指導教員: 渡部大輔全文公表年月日: 2025-05-21doctoral thesi
貨物地域流動調査を用いたトラック輸送の効率化及びCO2排出量の削減に関する研究
Full text link東京海洋大学修士(海洋科学)東京海洋大学修士学位論文 2024年度(2025年3月) 食品流通安全管理 修士 第4638号指導教員: 黒川久幸全文公表年月日: 2025-06-16master thesi