Výsledky vyhledávání - "Koichi KITAHARA"

Akademický článek

Comprehensive experimental datasets of quasicrystals and their approximants

Autor: Erina Fujita, Chang Liu, Asuka Ishikawa, Tomoya Mato, Koichi Kitahara, Ryuji Tamura, Kaoru Kimura, Ryo Yoshida, Yukari Katsura

Publikováno v: Scientific Data, Vol 11, Iss 1, Pp 1-9 (2024)

Abstract Quasicrystals are solid-state materials that typically exhibit unique symmetries, such as icosahedral or decagonal diffraction symmetry. They were first discovered in 1984. Over the past four decades of quasicrystal research, around 100 stab

Externí odkaz: https://doaj.org/article/8278ca6e838d4caaaec04e5182598643

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Akademický článek

Crystal structures of five compounds in the aluminium–ruthenium–silicon system

Autor: Koichi Kitahara, Hiroyuki Takakura, Yutaka Iwasaki, Kaoru Kimura

Publikováno v: Acta Crystallographica Section E: Crystallographic Communications, Vol 79, Iss 10, Pp 946-951 (2023)

Single crystals of five compounds with approximate compositions ∼Ru16(Al0.78Si0.22)47, (I), ∼Ru9(Al0.70Si0.30)32, (II), ∼Ru10(Al0.67Si0.33)41, (III), ∼Ru(Al0.57Si0.43)5, (IV), and ∼Ru2(Al0.46Si0.54)9, (V), were obtained from polycrystalline

Externí odkaz: https://doaj.org/article/51751eec0aec4e55ace11a278b7d9a0d

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Akademický článek

Deep Learning Enables Rapid Identification of a New Quasicrystal from Multiphase Powder Diffraction Patterns

Autor: Hirotaka Uryu, Tsunetomo Yamada, Koichi Kitahara, Alok Singh, Yutaka Iwasaki, Kaoru Kimura, Kanta Hiroki, Naoya Miyao, Asuka Ishikawa, Ryuji Tamura, Satoshi Ohhashi, Chang Liu, Ryo Yoshida

Publikováno v: Advanced Science, Vol 11, Iss 1, Pp n/a-n/a (2024)

Abstract Since the discovery of the quasicrystal, approximately 100 stable quasicrystals are identified. To date, the existence of quasicrystals is verified using transmission electron microscopy; however, this technique requires significantly more e

Externí odkaz: https://doaj.org/article/fb5ad7241ef54a9d8f6fe4fef0ac9c3e

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Akademický článek

A Temperature Stable Amplifier Characteristics of AlGaN/GaN HEMTs on 3C-SiC/Si

Autor: Arijit Bose, Debaleen Biswas, Shigeomi Hishiki, Sumito Ouchi, Koichi Kitahara, Keisuke Kawamura, Akio Wakejima

Publikováno v: IEEE Access, Vol 9, Pp 57046-57053 (2021)

A high temperature stable amplifier characteristics for L-band or 2 GHz was studied using AlGaN/GaN high electron mobility transistors (HEMTs) on 3C-SiC/Si substrate. A crack free, high quality AlGaN/GaN heterostructure on a 6-inch Czochralski (Cz)-S

Externí odkaz: https://doaj.org/article/649396b6e8854d82826cdc8242c7e3f0

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Akademický článek

Phase stability and thermoelectric properties of semiconductor-like tetragonal FeAl2

Autor: Kazuki Tobita, Koichi Kitahara, Yukari Katsura, Naoki Sato, Daisuke Nishio-Hamane, Hirotada Gotou, Kaoru Kimura

Publikováno v: Science and Technology of Advanced Materials, Vol 20, Iss 1, Pp 937-948 (2019)

Tetragonal FeAl2 is a high-pressure phase and is predicted to exhibit semiconductor-like behavior. We investigated the pressure and temperature synthesizing conditions of tetragonal FeAl2, supported by in situ X-ray diffractions, using synchrotron ra

Externí odkaz: https://doaj.org/article/6d0b8d81905f4f10b375ac05ad105812

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