Zobrazeno 1 - 10
of 191
pro vyhledávání: '"Tomoyuki Johzaki"'
Publikováno v:
Journal of Thermal Science and Technology, Vol 18, Iss 1, Pp 23-00038-23-00038 (2023)
We experimentally investigated the influences of a small obstacle on the sidewall upon a detonation cellular structure using the smoked-foil technique for a stoichiometric hydrogen–oxygen mixture diluted with argon at pressures ranging from 15 to 6
Externí odkaz:
https://doaj.org/article/10b0fe3641824b19a7753cad2a8e0779
Autor:
Jiahao Wang, Maki Kishimoto, Tomoyuki Johzaki, Kairi Mizushima, Chihiro Kumeda, Takeshi Higashiguchi, Atsushi Sunahara, Hikari Ohiro, Kotaro Yamasaki, Shinichi Namba
Publikováno v:
Atoms, Vol 10, Iss 4, p 150 (2022)
Highly charged ions in the plasma produced by high-power laser can radiate bright and short-pulse X-rays. Owing to the unresolved transition array (UTA) from the high-Z elements, laser produced plasma has been applied for developing X-ray sources. In
Externí odkaz:
https://doaj.org/article/f5fb313f7cf64f4fb3744d0d75e60a74
Publikováno v:
Journal of Thermal Science and Technology, Vol 16, Iss 2, Pp JTST0018-JTST0018 (2021)
We experimentally investigated the promotion of deflagration-to-detonation transition (DDT) in hydrogen-air mixtures contained in a tube in which straight-shaped rods were installed as obstacles. In the experiments, the number of obstacle rods, their
Externí odkaz:
https://doaj.org/article/5ef1f08380da439181d5ecd73f9fc8c0
Publikováno v:
Journal of Thermal Science and Technology, Vol 15, Iss 3, Pp JTST0030-JTST0030 (2020)
The characteristics of the propagation of a detonation from a cylindrical tube of constant cross section into a diverging cone were experimentally investigated using the smoked-foil technique for three explosive gas mixtures: C2H2+2.5O2, 2H2+O2+4.5Ar
Externí odkaz:
https://doaj.org/article/8869275fd4694f83a23aab5c5d7423c9
Autor:
Shohei Sakata, Seungho Lee, Hiroki Morita, Tomoyuki Johzaki, Hiroshi Sawada, Yuki Iwasa, Kazuki Matsuo, King Fai Farley Law, Akira Yao, Masayasu Hata, Atsushi Sunahara, Sadaoki Kojima, Yuki Abe, Hidetaka Kishimoto, Aneez Syuhada, Takashi Shiroto, Alessio Morace, Akifumi Yogo, Natsumi Iwata, Mitsuo Nakai, Hitoshi Sakagami, Tetsuo Ozaki, Kohei Yamanoi, Takayoshi Norimatsu, Yoshiki Nakata, Shigeki Tokita, Noriaki Miyanaga, Junji Kawanaka, Hiroyuki Shiraga, Kunioki Mima, Hiroaki Nishimura, Mathieu Bailly-Grandvaux, João Jorge Santos, Hideo Nagatomo, Hiroshi Azechi, Ryosuke Kodama, Yasunobu Arikawa, Yasuhiko Sentoku, Shinsuke Fujioka
Publikováno v:
Nature Communications, Vol 9, Iss 1, Pp 1-9 (2018)
It is desirable to deposit more energy in the dense plasma core to trigger the fusion ignition. Here the authors demonstrate enhanced energy coupling from laser to plasma core by using solid targets and guiding the transport of relativistic electron
Externí odkaz:
https://doaj.org/article/1aebef0589a84791be1e4b43c25ee400
Autor:
Taichi Morita, Masafumi Edamoto, Satoshi Miura, Atsushi Sunahara, Naoya Saito, Yutaro Itadani, Tomihiko Kojima, Yoshitaka Mori, Tomoyuki Johzaki, Yoshihiro Kajimura, Shinsuke Fujioka, Akifumi Yogo, Hiroaki Nishimura, Hideki Nakashima, Naoji Yamamoto
Publikováno v:
Scientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
Abstract We report an experimental demonstration of controlling plasma flow direction with a magnetic nozzle consisting of multiple coils. Four coils are controlled separately to form an asymmetric magnetic field to change the direction of laser-prod
Externí odkaz:
https://doaj.org/article/95448502f1fe48988f19c339536dac6c
Autor:
Takuma ENDO, Keiji MASUDA, Wataru WATANABE, Takuya MUKAI, Hiroki NAGAI, Tomoyuki JOHZAKI, Ken MATSUOKA
Publikováno v:
Journal of Thermal Science and Technology, Vol 11, Iss 2, Pp JTST0022-JTST0022 (2016)
In this study, experiments on a pulse detonation turbine engine (PDTE) were conducted. The final goal of this work is the self-sustained operation of a PDTE system in which all of the air used for its operation is supplied by a turbine-compressor dri
Externí odkaz:
https://doaj.org/article/292e06e5bd434441bb54de0a57ed45ac
Autor:
Tomoyuki Johzaki, Hideo Nagatomo
Publikováno v:
The Journal of The Institute of Electrical Engineers of Japan. 141:555-558
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::649630390b468441afc7968325510194
https://doi.org/10.1541/ieejjournal.141.555
https://doi.org/10.1541/ieejjournal.141.555
Autor:
Binghe Shi, Akifumi Yogo, Kazuki Okamoto, Daniil Golovin, Seyed Reza Mirfayzi, Alessio Morace, Yasunobu Arikawa, Kohei Yamanoi, Yuki Abe, Masakatsu Murakami, Yanjun Gu, Kunioki Mima, Yasuhiko Sentoku, Mitsuo Nakai, Hiroyuki Nishimura, Hiroyuki Shiraga, Shinsuke Fujioka, Tomoyuki Johzaki, Akifumi Iwamoto, Hitoshi Sakagami, Ryosuke Kodama
Publikováno v:
Journal of Plasma Physics. 88
In this study, we experimentally evaluate the ion transportation through a cone guide target, which accelerates ions up to MeV energies via target normal sheath acceleration, and transports them onto the position of imploding fuel in the fast ignitio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::10d8ef654cb5a79075fd6d25dfcb3315
https://doi.org/10.1017/s0022377822000599
https://doi.org/10.1017/s0022377822000599
Deflagration-to-detonation transition in laser-ignited explosive gas contained in a smooth-wall tube
Autor:
Wookyung Kim, Takuma Endo, Tomoyuki Johzaki, Daisuke Shimokuri, Akira Miyoshi, Shinichi Namba, Shimon Kuwajima
Publikováno v:
Combustion and Flame. 219:275-282
The effect of laser ignition on the deflagration-to-detonation transition (DDT) was experimentally investigated. Explosive gas, which was 0.87[(1/4)C2H4+(3/4)O2]+0.13N2 contained in a smooth-wall tube at 100 kPa and approximately 20 °C, was ignited
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::05914b1b5e9405231117da44891fcd3c
https://doi.org/10.1016/j.combustflame.2020.06.005
https://doi.org/10.1016/j.combustflame.2020.06.005