Search Results - "TSUCHIYAMA, Akira"

Low Core-Mantle Boundary Temperature Inferred from the Solidus of Pyrolite by Nomura, Ryuichi, Hirose, Kei, Uesugi, Kentaro, Ohishi, Yasuo, Tsuchiyama, Akira, Miyake, Akira, Ueno, Yuichiro

“…The melting temperature of Earth's mantle provides key constraints on the thermal structures of both the mantle and the core. Through high-pressure experiments…”
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Three-dimensional microstructure and mineralogy of a cosmic symplectite in the Acfer 094 carbonaceous chondrite: Implication for its origin by Matsumoto, Megumi, Tsuchiyama, Akira, Miyake, Akira, Ito, Motoo, Matsuno, Junya, Uesugi, Kentaro, Takeuchi, Akihisa, Kodama, Yu, Yasutake, Masahiro, Vaccaro, Epifanio

“…Cosmic symplectites (COSes), consisting mainly of nanoscaled symplectic intergrowths of magnetite and Fe-Ni sulfides, have extremely heavy oxygen isotopic…”
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Three-dimensional shape distribution of lunar regolith particles collected by the Apollo and Luna programs by Tsuchiyama, Akira, Sakurama, Takashi, Nakano, Tsukasa, Uesugi, Kentaro, Ohtake, Makiko, Matsushima, Takashi, Terakado, Kazuo, Galimov, Erik M.

“…The shapes of regolith particles on airless bodies, such as the Moon and asteroids, are important to understand their formation and evolution on surfaces…”
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Structural and chemical modifications of oxides and OH generation by space weathering: Electron microscopic/spectroscopic study of hydrogen-ion-irradiated Al2O3 by Igami, Yohei, Muto, Shunsuke, Takigawa, Aki, Ohtsuka, Masahiro, Miyake, Akira, Suzuki, Kohtaku, Yasuda, Keisuke, Tsuchiyama, Akira

“…Minerals on airless bodies exhibit characteristic spectral features such as darkening and reddening. Such space weathering is mainly due to hydrogen-ion…”
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Association of silica phases as geothermobarometer for eucrites: Implication for two‐stage thermal metamorphism in the eucritic crust by Ono, Haruka, Takenouchi, Atsushi, Mikouchi, Takashi, Yamaguchi, Akira, Yasutake, Masahiro, Miyake, Akira, Tsuchiyama, Akira, Righter, Kevin

“…Silica mineral is present in different stable polymorphs depending on the temperature and pressure conditions of crystallization. We suggest using silica…”
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Three-dimensional imaging of high-velocity-impact induced crack growth in carbonaceous meteorites by Michikami, Tatsuhiro, Tsuchiyama, Akira, Hagermann, Axel, Takeda, Akio, Shishido, Katsuki, Otsuka, Yushi, Sasaki, Osamu, Nakamura, Michihiko, Okumura, Satoshi, Kano, Harumasa, Hasegawa, Sunao

“…The material strength of meteorites provides useful information on the make-up and history of asteroids. However, the unique determination of the material…”
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Three-Dimensional Structure of Hayabusa Samples: Origin and Evolution of Itokawa Regolith by Tsuchiyama, Akira, Uesugi, Masayuki, Matsushima, Takashi, Michikami, Tatsuhiro, Kadono, Toshihiko, Nakamura, Tomoki, Uesugi, Kentaro, Nakano, Tsukasa, Sandford, Scott A., Noguchi, Ryo, Matsumoto, Toru, Matsuno, Junya, Nagano, Takashi, Imai, Yuta, Takeuchi, Akihisa, Suzuki, Yoshio, Ogami, Toshihiro, Katagiri, Jun, Ebihara, Mitsuru, Ireland, Trevor R., Kitajima, Fumio, Nagao, Keisuke, Naraoka, Hiroshi, Noguchi, Takaaki, Okazaki, Ryuji, Yurimoto, Hisayoshi, Zolensky, Michael E., Mukai, Toshifumi, Abe, Masanao, Yada, Toru, Fujimura, Akio, Yoshikawa, Makoto, Kawaguchi, Junichiro

“…Regolith particles on the asteroid Itokawa were recovered by the Hayabusa mission. Their three-dimensional (3D) structure and other properties, revealed by…”
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Chondrulelike Objects in Short-Period Comet 81P/Wild 2 by Nakamura, Tomoki, Noguchi, Takaaki, Tsuchiyama, Akira, Ushikubo, Takayuki, Kita, Noriko T, Valley, John W, Zolensky, Michael E, Kakazu, Yuki, Sakamoto, Kanako, Mashio, Etsuko, Uesugi, Kentaro, Nakano, Tsukasa

“…The Stardust spacecraft returned cometary samples that contain crystalline material, but the origin of the material is not yet well understood. We found four…”
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Shear deformation experiments on vesicular rhyolite: Implications for brittle fracturing, degassing, and compaction of magmas in volcanic conduits by Okumura, Satoshi, Nakamura, Michihiko, Nakano, Tsukasa, Uesugi, Kentaro, Tsuchiyama, Akira

“…Shear‐induced brittle fractures in vesicular magmas are thought to be possible pathways for open‐system degassing that controls the explosivity of volcanic…”
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Evolution of bubble microstructure in sheared rhyolite: Formation of a channel-like bubble network by Okumura, Satoshi, Nakamura, Michihiko, Tsuchiyama, Akira, Nakano, Tsukasa, Uesugi, Kentaro

“…The microstructure of bubbles in magma controls the dynamics of magma flow in a volcanic conduit. To investigate the shear‐induced evolution of bubble…”
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The search for and analysis of direct samples of early Solar System aqueous fluids by Zolensky, Michael E., Bodnar, Robert J., Yurimoto, Hisayoshi, Itoh, Shoichi, Fries, Marc, Steele, Andrew, Chan, Queenie H.-S., Tsuchiyama, Akira, Kebukawa, Yoko, Ito, Motoo

“…We describe the current state of the search for direct, surviving samples of early, inner Solar System fluids-fluid inclusions in meteorites. Meteoritic…”
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3D Shape Characterization and Image-Based DEM Simulation of the Lunar Soil Simulant FJS-1 by Matsushima, Takashi, Katagiri, Jun, Uesugi, Kentaro, Tsuchiyama, Akira, Nakano, Tsukaka

“…This paper describes a procedure used to characterize the three-dimensional (3D) grain shape of lunar soil and undertake simulations of lunar soil by…”
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A newly revised estimation of bulk densities and examination of the shape of individual Ryugu grains by Miyazaki, Akiko, Yada, Toru, Yogata, Kasumi, Hatakeda, Kentaro, Nakato, Aiko, Nishimura, Masahiro, Nagashima, Kana, Kumagai, Kazuya, Hitomi, Yuya, Soejima, Hiromichi, Tahara, Rui, Kanemaru, Rei, Nakano, Arisa, Yoshitake, Miwa, Iwamae, Ayako, Furuya, Shizuho, Tsuchiyama, Akira, Tachibana, Shogo, Michikami, Tatsuhiro, Okada, Tatsuaki, Abe, Masanao, Usui, Tomohiro

“…The bulk density of grains from a celestial body is a fundamental property related to its composition and structure, contributing to the understanding of its…”
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Space weathered rims found on the surfaces of the Itokawa dust particles by Noguchi, Takaaki, Kimura, Makoto, Hashimoto, Takahito, Konno, Mitsuru, Nakamura, Tomoki, Zolensky, Michael E., Okazaki, Ryuji, Tanaka, Masahiko, Tsuchiyama, Akira, Nakato, Aiko, Ogami, Toshinori, Ishida, Hatsumi, Sagae, Ryosuke, Tsujimoto, Shinichi, Matsumoto, Toru, Matsuno, Junya, Fujimura, Akio, Abe, Masanao, Yada, Toru, Mukai, Toshifumi, Ueno, Munetaka, Okada, Tatsuaki, Shirai, Kei, Ishibashi, Yukihiro

“…On the basis of observations using Cs‐corrected STEM, we identified three types of surface modification probably formed by space weathering on the surfaces of…”
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Magma deformation may induce non-explosive volcanism via degassing through bubble networks by Okumura, Satoshi, Nakamura, Michihiko, Takeuchi, Shingo, Tsuchiyama, Akira, Nakano, Tsukasa, Uesugi, Kentaro

“…The open-system degassing of magma controls the bifurcation of explosive and non-explosive volcanism. Permeable gas flow through connected bubbles is a…”
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Oxygen Isotopic Compositions of Asteroidal Materials Returned from Itokawa by the Hayabusa Mission by Yurimoto, Hisayoshi, Abe, Ken-ichi, Abe, Masanao, Ebihara, Mitsuru, Fujimura, Akio, Hashiguchi, Minako, Hashizume, Ko, Ireland, Trevor R., Itoh, Shoichi, Katayama, Juri, Kato, Chizu, Kawaguchi, Junichiro, Kawasaki, Noriyuki, Kitajima, Fumio, Kobayashi, Sachio, Meike, Tatsuji, Mukai, Toshifumi, Nagao, Keisuke, Nakamura, Tomoki, Naraoka, Hiroshi, Noguchi, Takaaki, Okazaki, Ryuji, Park, Changkun, Sakamoto, Naoya, Seto, Yusuke, Takei, Masashi, Tsuchiyama, Akira, Uesugi, Masayuki, Wakaki, Shigeyuki, Yada, Toru, Yamamoto, Kosuke, Yoshikawa, Makoto, Zolensky, Michael E.

“…Meteorite studies suggest that each solar system object has a unique oxygen isotopic composition. Chondrites, the most primitive of meteorites, have been…”
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Formation process of sub-micrometer-sized metasomatic platinum-group element-bearing sulfides in a Tahitian harzburgite xenolith by Akizawa, Norikatsu, Kogiso, Tetsu, Miyake, Akira, Tsuchiyama, Akira, Igami, Yohei, Uesugi, Masayuki

“…Base-metal sulfides (BMSs) are minerals that host platinum-group elements (PGE) in mantle peridotites and significantly control the bulk PGE content. They have…”
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Surface and internal structures of a space-weathered rim of an Itokawa regolith particle by Matsumoto, Toru, Tsuchiyama, Akira, Miyake, Akira, Noguchi, Takaaki, Nakamura, Michihiko, Uesugi, Kentaro, Takeuchi, Akihisa, Suzuki, Yoshio, Nakano, Tsukasa

“…•We observe surface morphologies of a regolith particle from asteroid Itokawa.•We compare the surface and internal structures of space-weathered rim.•We show…”
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Combining IR and X‐ray microtomography data sets: Application to Itokawa particles and to Paris meteorite by Dionnet, Zelia, Brunetto, Rosario, Aléon‐Toppani, Alice, Rubino, Stefano, Baklouti, Donia, Borondics, Ferenc, Buellet, Anne‐Cécile, Djouadi, Zahia, King, Andrew, Nakamura, Tomoki, Rotundi, Alessandra, Sandt, Christophe, Troadec, David, Tsuchiyama, Akira

“…In the near future, a new generation of sample return missions (Hayabusa2, OSIRIS‐REx, MMX, etc.) will collect samples from small solar system bodies. To…”
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Three-axial shape distributions of pebbles, cobbles and boulders smaller than a few meters on asteroid Ryugu by Michikami, Tatsuhiro, Hagermann, Axel, Morota, Tomokatsu, Yokota, Yasuhiro, Urakawa, Seitaro, Okamura, Hiroyuki, Tanabe, Naoya, Yumoto, Koki, Ebihara, Tatsuki, Cho, Yuichiro, Ernst, Carolyn M., Hayakawa, Masahiko, Hirabayashi, Masatoshi, Hirata, Naru, Honda, Chikatoshi, Honda, Rie, Kameda, Shingo, Kanamaru, Masanori, Kikuchi, Hiroshi, Kikuchi, Shota, Kouyama, Toru, Matsuoka, Moe, Miyamoto, Hideaki, Noguchi, Takaaki, Noguchi, Rina, Ogawa, Kazunori, Okada, Tatsuaki, Sakatani, Naoya, Sasaki, Sho, Sawada, Hirotaka, Sugimoto, Chiho, Suzuki, Hidehiko, Tanaka, Satoshi, Tatsumi, Eri, Tsuchiyama, Akira, Tsuda, Yuichi, Watanabe, Sei-ichiro, Yamada, Manabu, Yoshikawa, Makoto, Yoshioka, Kazuo, Sugita, Seiji

“…Over a broad size range, the shapes of impact fragments from catastrophic disruptions are distributed around the mean axial ratio 2: √2: 1, irrespective of…”
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