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Your search keyword '"Kubo, Kohei"' showing total 19 results
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19 results on '"Kubo, Kohei"'

1. Continuous Similarity Search for Text Sets

Author

Tsuchida, Yuma, Kubo, Kohei, Koga, Hisashi, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Strauss, Christine, editor, Cuzzocrea, Alfredo, editor, Kotsis, Gabriele, editor, Tjoa, A Min, editor, and Khalil, Ismail, editor

Published
2022
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6. Space Charge Accumulation Characteristics on Fluorine-based Insulating Material of Electron beam Irradiated

Author

Kubo, Kohei, Endo, Kazuki, Enoki, Kaisei, Miyake, Hiroaki, and Tanaka, Yasuhiro

Subjects
宇宙機用絶縁材料, Insulating material, パルス静電応力法, used for spacecraft Ethylene-tetrafluoroethylene, エチレン四フッ化エチレン共重合体, 電子線, Electron-beam, 空間電荷, Space charge pulsed electroacoustic method
Abstract

第16回宇宙環境シンポジウム (2019年11月12日-13日. 東京都市大学横浜キャンパス), 横浜市, 神奈川県, The 16th Spacecraft Environment Symposium (November 12-13, 2019. Yokohama Campus, Tokyo City University), Yokohama, Kanagawa, Japan, Spacecraft are covered with MLI and OSR for protecting from the hard temperature differential in space environment and keeping the temperature inside of spacecraft. As the satellite are operated in the Van-Allen belt, those insulating materials are exposed by radio-active rays, such as electron and proton. Those charged particles are injected and accumulate in the bulk of materials. And it will be origin of electric static discharge (ESD). There phenomenon may lead to the satellite operation anomaly. Therefore, it is necessary to understand charging phenomena in the bulks of materials for spacecraft based on electronic physics, for reliabilities of long-life operation. In this research, we try to understand the charging phenomena on fluorinated polymer which are used for wire harness. Space charge accumulations in the bulk of the sample irradiated by an electron under DC application were studied using the pulsed electroacoustic (PEA) method., 形態: カラー図版あり, Physical characteristics: Original contains color illustrations, 資料番号: AA1930014002, レポート番号: JAXA-SP-19-009

Published
2020

8. Space Charge Accumulation Characteristics in Fluorine-based Insulating Material Irradiated By E-Beam

Author

Kubo, Kohei, Yoshida, Shugo, Miyake, Hiroaki, and Tanaka, Yasuhiro

Subjects
Space charge distribution, 電子線, 電子・正孔対, electron-hole pairs, 空間電荷分布, FEP, E-beam
Abstract

第15回宇宙環境シンポジウム (2018年10月30日-31日. 東北大学青葉サイエンスホール), 仙台市, 宮城県, We observed electron hole pairs inside the sample by irradiating the insulating materials by e-beam. However, it is not clears detailed characteristics of electron hole pairs. So we try to elucidate the relationship between the amount of electron hole pair and the condition of electron irradiation., 形態: カラー図版あり, Physical characteristics: Original contains color illustrations, 資料番号: AA1830019025, レポート番号: JAXA-SP-18-009

Published
2019

12. Platinum Nanosheets Intercalated into Natural and Artificial Graphite Powders.

Author

Shirai, Masayuki, Kubo, Kohei, Sodeno, Mika, and Nanao, Hidetaka

Subjects
*NANOSTRUCTURED materials, *SUPERCRITICAL carbon dioxide, *GRAPHITE, *PLATINUM, *CINNAMON, *CHLOROPLATINIC acid, *POWDERS
Abstract

Insertion of sheet‐type platinum particles (platinum nanosheets) between graphite layers was achieved by a thermal treatment of a mixture of platinum chloride (IV) and graphite powder (natural graphite or artificial graphite) under 0.3 MPa of chlorine at 723 K, followed by the treatment under 40 kPa of hydrogen pressure. Similar platinum nanosheets, which were 1–3 nm in thickness and 100–500 nm in width and had a number of hexagonal holes and edges with 120° angle, were formed between the layers of both natural graphite or artificial graphite; however, their location in the graphite layers depended on the type of graphite used. A number of platinum nanosheets were observed in the edge region of natural graphite particles which have flat surface. On the other hand, a number of platinum nanosheets were found inside and away from the edge of the artificial graphite particles especially in the vicinity of the cracks. Both the platinum nanosheet‐containing artificial and natural graphite samples showed high selectivity to cinnamyl alcohol in cinnamaldehyde hydrogenation under supercritical carbon dioxide conditions, while spherical platinum particles, which were located on the surface of natural and artificial graphite, showed lower selectivity. [ABSTRACT FROM AUTHOR]

Published
2021
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19. Front Cover: Platinum Nanosheets Intercalated into Natural and Artificial Graphite Powders (15/2021).

Author

Shirai, Masayuki, Kubo, Kohei, Sodeno, Mika, and Nanao, Hidetaka

Subjects
*NANOSTRUCTURED materials, *PLATINUM, *PLATINUM nanoparticles, *SUPERCRITICAL carbon dioxide, *GRAPHITE, *POWDERS
Abstract

The platinum nanosheets between graphite layers were highly selective to cinnamyl alcohol as compared to platinum particles on the graphite surface for cinnamaldehyde hydrogenation in supercritical carbon dioxide solvent. Graphite intercalated compounds, Platinum nanosheet, Cinnamaldehyde hydrogenation, Graphite, Supercritical carbon dioxide Keywords: Graphite intercalated compounds; Platinum nanosheet; Cinnamaldehyde hydrogenation; Graphite; Supercritical carbon dioxide EN Graphite intercalated compounds Platinum nanosheet Cinnamaldehyde hydrogenation Graphite Supercritical carbon dioxide 2002 2002 1 08/09/21 20210802 NES 210802 B Two-dimensional platinum nanoparticles (platinum nanosheets) b were prepared between artificial and natural graphite layers by the insertion of platinum chloride and reduction with hydrogen. [Extracted from the article]

Published
2021
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