Výsledky vyhledávání - "Takaya Nagai"

Direct Two-Dimensional Time Series Observation of pH Distribution around Dissolving Calcium Carbonate Crystals in Aqueous Solution

Autor: Takaya Nagai, Yukiko Nagai, Sachiko Kawada, Henry Teng, Jun Kawano, Takashi Toyofuku, Kaede Nishimura, Akiyuki Ueda

Publikováno v: Crystal Growth & Design. 19:4212-4217

Monitoring in situ local pH changes to dissolving/growing crystal surfaces is critical to decipher the related mechanisms. To date, however, reliable techniques to acquire such measurements remain ...

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b52c2b0e623524ade6dd8424435839c2
https://doi.org/10.1021/acs.cgd.9b00045

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Direct observation of symmetrization of hydrogen bond in δ-AlOOH under mantle conditions using neutron diffraction

Autor: Takaya Nagai, Antonio M. dos Santos, Asami Sano-Furukawa, Hiroyuki Kagi, Jamie J. Molaison, Christopher A. Tulk, Takanori Hattori, Kazuki Komatsu

Publikováno v: Scientific Reports, Vol 8, Iss 1, Pp 1-9 (2018)
Scientific Reports

At ambient pressure, the hydrogen bond in materials such as ice, hydrates, and hydrous minerals that compose the Earth and icy planets generally takes an asymmetric O-H···O configuration. Pressure significantly affects this configuration, and it i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6f12ba355494fe940690959ee036ea4c
http://link.springer.com/article/10.1038/s41598-018-33598-2

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Structural variations accompanied by thermal expansion of diaspore: in-situ single-crystal and powder X-ray diffraction study

Autor: Teruki Sugiura, Takaya Nagai, Kazumasa Sugiyama, Hiroshi Arima

Publikováno v: Physics and Chemistry of Minerals. 45:1003-1010

In-situ single-crystal and powder X-ray diffraction (XRD) experiments were performed on diaspore at high temperatures. The powder XRD experiments showed that the dehydration reaction from diaspore to corundum occurs between 703 and 733 K. The in-situ

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::abbd398bd83d603c39cb086902c98993
https://doi.org/10.1007/s00269-018-0981-y

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Temporary restoration project of BRT instead of restoring railways on Tsunami-hit regions by the Great East Japan Earthquake

Autor: Yasushi Sumita, Yutaka Ooguchi, Takaya Nagai, Yasuyuki Yamaguchi, Yoshihiro Kumamoto

Publikováno v: Transportation Research Procedia. 25:3826-3839

BRT(Bus Rapid Transit) has been provided as a temporary transport restoration project in the wake of the damage by tsunami accompanying the Great East Japan Earthquake, as much time would be required to restore lines to their original state. Issues i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cb6b41a806fe6998f1d86b7bde68bd8e
https://doi.org/10.1016/j.trpro.2017.05.276

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Precipitation of halite during calcification of the massive reef-building coral Porites lobata

Autor: Tsuyoshi Watanabe, Takaya Nagai, Satoko Motai, Kohki Sowa, Jun Kawano

Publikováno v: European Journal of Mineralogy. 28:265-271

Detailed observations of mineral phases in the skeleton of a massive reef-building coral were performed at nano- to micrometer scales using an analytical transmission electron microscope. The most notable result is the discovery of a nanosized halite

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cc907e7475d4f28f6f66197444583004
https://doi.org/10.1127/ejm/2016/0028-2521

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The effect of Mg2+ incorporation on the structure of calcium carbonate clusters: investigation by the anharmonic downward distortion following method

Autor: Takaya Nagai, Satoshi Maeda, Jun Kawano

Publikováno v: Physical Chemistry Chemical Physics. 18:2690-2698

Mg(2+) is considered to play an important role in the formation of calcium carbonate polymorphs; however, how it affects polymorph selection during the early stages of CaCO3 formation is not yet well understood. In the present study, in order to clar

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9b8b0bf2a62020c3bbf3f390c122b2a5
https://doi.org/10.1039/c5cp05139h

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Pressure-induced irreversible amorphization of naphthalene and nitrogen-containing heteroaromatic compounds at room temperature

Autor: Hiroyuki Kagi, Takaya Nagai, Ayako Shinozaki, Satoshi Nakano

Publikováno v: Chemical Physics Letters. 739:136921

Pressure-induced irreversible chemical reactions of naphthalene, 2,3-naphthyridine (2,3-Nap), and 1,5-naphthyridine (1,5-Nap) were observed after compression (>16–18 GPa) at room temperature. Regardless of the initial materials, amorphous products

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::961fd60b3d72a5ec10fe2ea0e453dbf2
https://doi.org/10.1016/j.cplett.2019.136921

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