Zobrazeno 1 - 10
of 30
pro vyhledávání: '"Hiroaki Ohfuji"'
Autor:
Hiroaki Kurishita, Hiroyuki Ishizaki, Hun Chea Jung, Koichi Niikura, Masahiro Onoi, Yutaka Nagasawa, Shunsuke Makimura, Tatsuaki Sakamoto, Hiroaki Ohfuji, Atsuro Kimura
Publikováno v:
Materials Science Forum. 1024:103-109
Tungsten (W) is a principal candidate as target material because of its high density and extremely high melting point. W inherently has a critical disadvantage of its brittleness at around room temperature (low temperature brittleness), recrystalliza
Autor:
Tatyana B. Bekker, Konstantin D. Litasov, Sergey V. Rashchenko, Hiroaki Ohfuji, Anton Shatskiy, Ivan V. Podborodnikov, A.V. Davydov, Nursultan Sagatov, S. P. Krasheninnikov, P. G. Krinitsin
Publikováno v:
Journal of the European Ceramic Society. 40:3663-3672
The Ti-Al-Zr-O system has received significant attention as it hosts a variety of phases of industrial interest. In this paper, new experiments on the Ti-Al-Zr-O system aimed at clarifying phase formation depending on the redox conditions with specia
Autor:
Hideaki Kawamura, Hiroaki Ohfuji
Publikováno v:
High Pressure Research. 40:162-174
Here we report a novel route for synthesizing nano-polycrystalline diamond (NPD) using stearic acid (C18H36O2) as a starting material under high pressure and high temperature. The obtained NPD show...
Publikováno v:
High Pressure Research. 40:96-106
Nano-polycrystalline diamond (NPD) with various grain sizes has been synthesized from glassy carbon at pressures 15–25 GPa and temperatures 1700–2300°C using multianvil apparatus. The minimum tempe...
Autor:
Tetsuo Irifune, Toru Shinmei, Fumitaro Ishikawa, Hiroaki Ohfuji, Mitsuru Funato, Rei Fukuta, Masafumi Matsushita, Yoichi Kawakami, Ryota Ishii
Publikováno v:
High Pressure Research. 40:140-147
Deep-ultraviolet continuous-wave photoluminescence spectroscopy is performed for nano-polycrystalline diamond (NPD) synthesized by a high pressure high-temperature technique. NPD exhibits clear dee...
Autor:
Norimasa Nishiyama, Timothy Officer, Tetsuo Irifune, Feng Shi, Yanbin Wang, Toru Shinmei, Tony Yu, Hiroaki Ohfuji, Julien Gasc
Publikováno v:
High Pressure Research. 40:35-53
The use of nanopolycrystalline diamond has allowed a systematic study on deformation of polycrystalline diamond composites (PCDCs). Bulk PCDCs samples containing either Co or SiC as a binding agent...
Autor:
Naohisa Hirao, Katsuya Shimizu, Toshiki Hamatani, Ryosuke Takeda, Takehiro Kunimoto, Naoki Ishimatsu, Takeshi Sakai, Keitaro Kuramochi, Hiroaki Ohfuji, Hirokazu Kadobayashi, Takehiko Yagi, Tetsuo Irifune, Yuki Nakamoto, Saori I. Kawaguchi, Hideto Mimori, Yasuo Ohishi
Publikováno v:
High Pressure Research. 40:12-21
Both micro-paired and conical support type double-stage diamond anvil cells (ds-DAC) were tested using a newly synthesized ultra-fine nano-polycrystalline diamond (NPD). Well-focused X-ray sub-micr...
Publikováno v:
High Pressure Research. 39:561-578
We present experimental results on melting and subsolidus phase relations in the Ni–Ni2P system at 6 GPa and 900–1600°C. The system has four stable phosphides: Ni3P nickelphosphide, Ni8P3/N...
Autor:
Hirokazu Kadobayashi, Yoshitaka Yamamoto, Satoka Ohnishi, Naohisa Hirao, Suguru Yoshida, Saori Kawaguchi-Imada, Hisako Hirai, Hiroaki Ohfuji, Michihiro Muraoka
Publikováno v:
Scientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
Scientific Reports
Scientific Reports
Hydrocarbon chemistry in the C–O–H system at high pressure and high temperature is important for modelling the internal structure and evolution of giant icy planets, such as Uranus and Neptune, as their interiors are thought to be mainly composed
Publikováno v:
Materials Science and Engineering: A. 748:428-433
Microstructure and yield strength at room temperature and 300 °C in Al-5 wt%Y2O3 and Al-5 wt%La2O3 fabricated by mechanical alloying (MA) have been investigated by transmission electron microscopy and compression test. Al-5 wt%Y2O3 and Al-5 wt%La2O3