Papers - UMEZU Ikurou
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Study on Collision Process of Opposing Unsteady Supersonic Jets and Shock Waves Reviewed
Sakira Uno, Hiroshi Fukuoka, Atsushi Suda, Ikurou Umezu
Open Journal of Fluid Dynamics 13 ( 2 ) 104 - 112 2023.5
Authorship:Last author
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Mixing of laser‐induced plumes colliding in a background gas Reviewed
Keita Katayama,Toshiki Kinoshita,Ren Okada,Hiroshi Fukuoka,Takehito Yoshida,Minoru Yaga,Tamao Aoki‐Matsumoto, Ikurou Umezu
Applied Physics A 128 2022.10
Authorship:Last author, Corresponding author
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リアルタイムオンライン指導により学生自身が自宅で行う実験・実習 Reviewed
市田 正夫, 青木 珠緖, 秋宗 秀俊, 梅津 郁朗
物理教育 69 ( 4 ) 257 - 264 2021
Authorship:Last author
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学生実験の作業化への懸念と対応 Reviewed
梅津郁朗、青木珠緖、市田正夫、山﨑篤志、山本常夏
物理教育 68 268 - 272 2020.12
Joint Work
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Expansion of laser-induced plume after the passage of a counter shock wave through a background gas Reviewed
Akira Higo, Keita Katayama, Hiroshi Fukuoka, Takehito Yoshida, Tamao Aoki, Minoru Yaga, Ikurou Umezu
Applied Physics A 126 ( 4 ) 2020.3
Joint Work
Authorship:Last author, Corresponding author Publisher:Springer Science and Business Media LLC
DOI: 10.1007/s00339-020-03476-8
Other Link: http://link.springer.com/article/10.1007/s00339-020-03476-8/fulltext.html
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Effect of counter shock wave on the expanding plume Reviewed
Katayama Keita, Horai Yuki, Fukuoka Hiroshi, Kinoshita Toshiki, Yoshida Takehito, Aoki Tamao, Umezu Ikurou
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 124 ( 2 ) 2018.2
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Numerical Analysis of Behavior on Opposing Unsteady Supersonic Jets in a Flow Field with Shields Reviewed
Toshiki Kinoshita, Hiroshi Fukuoka, Ikurou Umezu
Materials Science Forum 910 96 - 101 2018.1
Joint Work
Authorship:Last author Publisher:Trans Tech Publications, Ltd.
Collision dynamics of opposing unsteady supersonic jets injected in background gas with shock waves were calculated to simulate double pulsed laser ablation. Since the jets are deflected by collision and the motion of debris is ballistic. This characteristic can be used to reduce the number of debris when shields are mounted in front of substrate. The flow of jets through installed shields is complicated by the interaction between shields and jets, and between shields and shock waves. We investigate influence of shield position on the shock waves and the jets by numerical calculations. Axisymmetric two-dimensional compressible Euler equations were solved using the finite volume method by using ANSYS Fluent 14.0.0 code. The shields with slit was mounted parallel to the direction of initially injected jets. In order to investigate the influence of shield position on the shock waves and the jets, the shield position and background gas pressure were adopted as parameters. The jets and shock wave are deflected by collision and they can pass through the slit of shields. The passed shock wave reflects at the substrate mounted behind the slits and it forces back the jet to decrease the jet velocity. The shield position governs the velocity and amount of the jet that reach the substrate.
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Lasing in organic mixed-crystal thin films with cavities composed of naturally formed cracks Reviewed
Mantoku Masaaki, Ichida Masao, Umezu Ikurou, Sugimura Akira, Aoki-Matsumoto Tamao
OPTICS LETTERS 42 ( 8 ) 1528 - 1531 2017.4
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e-beam irradiation effects on IR absorption bands in single-walled carbon nanotubes Reviewed
Ichida Masao, Nagao Katsunori, Ikemoto Yuka, Okazaki Toshiya, Miyata Yasumitsu, Kawakami Akira, Kataura Hiromichi, Umezu Ikurou, Ando Hiroaki
SOLID STATE COMMUNICATIONS 250 119 - 122 2017.1
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Hierarchical Structure of TiO2 Nano-Aggregates Prepared by Pulsed Laser Ablation in Background Gas Reviewed
Umezu Ikurou, Yoshida Takehito
ELECTRONICS AND COMMUNICATIONS IN JAPAN 99 ( 10 ) 40 - 45 2016.10
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Pulsed-laser-deposited TiO2 nanocrystalline films supporting Au nanoparticles for visible-light-operating plasmonic photocatalysts
Yoshida Takehito, Watanabe Tei, Kikuchi Fumito, Tabuchi Takeru, Umezu Ikurou, Haraguchi Masanobu
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 122 ( 5 ) 2016.5
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Dynamics of colliding laser ablation plumes in background gas Reviewed
Umezu Ikurou, Hashiguchi Yusuke, Fukuoka Hiroshi, Sakamoto Naomichi, Aoki Tamao, Sugimura Akira
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 122 ( 4 ) 2016.4
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Pulsed-laser-deposited TiO2 nanocrystalline films supporting Au nanoparticles for visible-light-operating plasmonic photocatalysts Reviewed
Yoshida, T., Watanabe, T., Kikuchi, F., Tabuchi, T., Haraguchi, M.
Applied Physics A 122 ( 5 ) 37 2016
Joint Work
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Pulsed laser irradiation-induced microstructures in the Mn ion implanted Si Reviewed
Naito Muneyuki, Yamada Ryo, Machida Nobuya, Koshiba Yusuke, Sugimura Akira, Aoki Tamao, Umezu Ikurou
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 365 110 - 113 2015.12
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Crossover from Efros-Shklovskii variable range hopping to nearest-neighbor hopping in silicon nanocrystal random network Reviewed
Inada Mitsuru, Yamamoto Hiroshi, Gibo Manabu, Ueda Rieko, Umezu Ikurou, Tanaka Shukichi, Saitoh Tadashi, Sugimura Akira
APPLIED PHYSICS EXPRESS 8 ( 10 ) 2015.10
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Correlation between crystallinity and mid-infrared optical absorption spectra of silicon supersaturated with sulfur Reviewed
Katsuki Nagao, Tatsuya Nakai, Muneyuki Naito, Mitsuru Inada, Tadashi Saitoh, Tamao Aoki and Akira Sugimura
MRS Proceedings 1738 mrsf14–1738–v14–05 2015
Joint Work
Authorship:Lead author
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ガス中パルスレーザアブレーションで作製された TiO2 ナノ粒子凝集体の階層構造 Reviewed
吉田 岳人
電気学会論文誌 C(電子・情報・システム部門誌) 135 ( 9 ) 1055 2015
Joint Work
Authorship:Lead author
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Hyperdoping of silicon with deep-level impurities by pulsed YAG laser melting
Umezu Ikurou, Naito Muneyuki, Kawabe Daisuke, Koshiba Yusuke, Nagao Katsuki, Sugimura Akira, Aoki Tamao, Inada Mitsuru, Saitoh Tadashi, Kohno Atsushi
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 117 ( 1 ) 155 - 159 2014.10
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Structural properties of TiO2 nanocrystallites condensed in vapor-phase for photocatalyst applications
Yoshida Takehito, Yagi Nobuyasu, Nakagou Riki, Sugimura Akira, Umezu Ikurou
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 117 ( 1 ) 223 - 227 2014.10
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Structural properties of TiO2 nanocrystallites condensed in vapor-phase for photocatalyst applications. Reviewed
Yoshida, T., Yagi, N., Nakagou, R., Sugimura, A.
Applied Physics A 117 223 - 227 2014
Single Work