Zobrazeno 1 - 10 of 91 pro vyhledávání: '"Maki Okube"'
1
Titanium local coordination environments in Cretaceous–Paleogene and Devonian–Carboniferous boundary sediments as a possible marker for large meteorite impact
Autor: Akira Yoshiasa, Takumi Maekawa, Tsubasa Tobase, Hidetomo Hongu, Toshifumi Komatsu, Maki Okube, Kazumasa Sugiyama, Hiroshi Arima
Publikováno v: Physics and Chemistry of Minerals. 46:675-685
The local coordination environments of Ti in Cretaceous–Paleogene (K–Pg) from Stevns Klint and Devonian–Carboniferous (D–C) boundary from western part of Cat Co Beach on Cat Ba Island sediments are studied by K-edge X-ray absorption fine stru
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fceb1a3989f9981b626ebad9f19e6525
https://doi.org/10.1007/s00269-019-01030-4
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2
XAFS study of Sb and As in Cretaceous–Tertiary boundary sediments: an index of soiling of the global environment with dust and ashes from impact ejecta falls
Autor: Maki Okube, Kazumasa Sugiyama, Tsubasa Tobase, Akira Yoshiasa, Hidetomo Hongu, Tsutomu Sato
Publikováno v: Journal of Mineralogical and Petrological Sciences. 114:224-230
The local structure around antimony (Sb) atoms in Cretaceous-Tertiary (K-T) boundary sediments from Stevns Klint in Denmark was studied using Sb K-edge X-ray absorption fine structure (XAFS) spectroscopy to obtain information about the chemical state
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a1474aadea47b8bb4cac2ef45f37ad36
https://doi.org/10.2465/jmps.180927
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3
Site occupancy of Fe2+, Fe3+and Ti4+in titanomagnetite determined by valence-difference contrast in synchrotron X-ray resonant scattering
Autor: Taro Oshiumi, Maki Okube, Kazumasa Sugiyama, Akira Yoshiasa, Ritsuro Miyawaki, Toshiro Nagase, Satoshi Sasaki
Publikováno v: Journal of Synchrotron Radiation. 25:1694-1702
A synchrotron X-ray diffraction study of a single crystal of titanomagnetite shows that the cation distribution of Fe2+, Fe3+and Ti4+is of the inverse-spinel type. The valence-difference contrast (VDC) method of resonant scattering was applied at a w
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::29a92290d8df49bfc3709c8a18f1b079
https://doi.org/10.1107/s1600577518013954
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4
Structure of Single-Crystal Rutile (TiO2) Prepared by High-Temperature Ultracentrifugation
Autor: Maki Okube, Yoshiaki Kinemuchi, Makoto Tokuda, Kazumasa Sugiyama, Hiroshi Isobe, Rabaya Bagum, Yudai Ogata, Tsutomu Mashimo, Akira Yoshiasa
Publikováno v: Crystal Growth & Design. 17:1460-1464
We report the preparation of single-crystal rutile (TiO2) with a unique structure prepared by ultracentrifugation at high temperature (strong gravitational field). Single-crystal rutile was subjected along the c-axis direction to a gravitational fiel
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ad35fc61d3d09c8980d63160d1bf7984
https://doi.org/10.1021/acs.cgd.6b01818
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6
Selective Chlorine Evolution Catalysts Based on Mg-Doped Nanoparticulate Ruthenium Dioxide
Autor: Maki Okube, Petr Krtil, Zdenk Bastl, Daniel F. Abbott, Valery Petrykin, Sanjeev Mukerjee
Publikováno v: Journal of The Electrochemical Society. 162:H23-H31
Nanocrystalline Mg-doped ruthenium dioxide catalysts with the formula Ru1-xMgxO2 (0 ≤ x ≤ 20) were synthesized by the spray-freezing freeze-drying technique. Synthesized materials are of nanoparticulate nature and show a single phase diffraction
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e942e484d08b006d32b750071e1b73d6
https://doi.org/10.1149/2.0541501jes
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8
Topologically Sensitive Surface Segregations of Au-Pd Alloys in Electrocatalytic Hydrogen Evolution
Autor: Valery Petrykin, Jonathan E. Mueller, Timo Jacob, Maki Okube, Petr Krtil, Donato Fantauzzi
Publikováno v: ChemElectroChem. 1:207-212
Density functional calculations along with in situ X-ray absorption spectroscopy data show that AuPd alloys form unique potential-controlled surface structures during the hydrogen evolution. We find evidence for surface segregations preferring a gold
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3cfa23fa7e94711a2ac7967a8a862a4e
https://doi.org/10.1002/celc.201300112
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10
Resonant and non-resonant magnetic scatterings with circularly polarized X-rays: magnetic scattering factor and electron density of gadolinium iron garnet
Autor: Maki Okube, Yo Sasaki, Satoshi Sasaki
Publikováno v: Acta crystallographica. Section A, Foundations and advances. 73(Pt 3)
Theoretical and experimental studies on resonant magnetic scattering have been carried out using circularly polarized X-rays. Polarization dependence of the asymmetric ratio between right- and left-handed polarized scattering amplitudes has revealed
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e7047eae5f432e72e251fdeb18b6d8b1
https://pubmed.ncbi.nlm.nih.gov/28447597
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