A5067535580- Rare-earth and actinide compounds
- Catalytic Processes in Materials Science
- Iron-based superconductors research
- Organic and Molecular Conductors Research
- X-ray Diffraction in Crystallography
- Magnetism in coordination complexes
- Catalysis and Oxidation Reactions
- Physics of Superconductivity and Magnetism
- Inorganic Chemistry and Materials
- Boron and Carbon Nanomaterials Research
- Zeolite Catalysis and Synthesis
- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Stellar, planetary, and galactic studies
- Graphene research and applications
- Crystallization and Solubility Studies
- Magnetic Properties of Alloys
- Quasicrystal Structures and Properties
- Magnetic properties of thin films
- Astronomy and Astrophysical Research
- Advancements in Battery Materials
- Solid-state spectroscopy and crystallography
- Chalcogenide Semiconductor Thin Films
- Chemical Synthesis and Reactions
- Astrophysics and Star Formation Studies
Aichi Medical University
2023
Kyoto College of Graduate Studies for Informatics
2021
Kyoto University
1985-2021
Saitama University
2021
Yokohama National University
2006-2020
The University of Tokyo
1993-2020
Hiroshima University
2008-2020
Nagoya University
2002-2019
Shimane University
2001-2019
University of Shimane
2019
Based on high-resolution spectra obtained during gravitational microlensing events we present a detailed elemental abundance analysis of 32 dwarf and subgiant stars in the Galactic bulge. [ABRIDGED], now have 58 microlensed bulge dwarfs subgiants that been homogeneously analysed. The main characteristics sample findings can be drawn are: (i) metallicity distribution (MDF) is wide spans all metallicities between [Fe/H]=-1.9 to +0.6; (ii) dip MDF around solar was apparent our previous smaller...
Systematic X-ray photoelectron spectroscopy (XPS), induced Auger electron (AES), absorption near edge structure (XANES) and extended fine (EXAFS) studies were undertaken to investigate the electronic structure, chemical states local geometry of active species in CuO/ZnO/Al2O3/ZrO2 multicomponent mixed oxide catalysts employed oxidative steam reforming methanol (OSRM) reaction for H2 production. The core level XPS AES indicated existence CuO ZnO-like species. Two kinds zirconium species, one...
Abstract Transmission electron microscopic studies have been performed on lattice defects in 6H silicon carbide single crystals; the crystals were subjected to microhardness indentation tests between room temperature and 1200°C then uniaxial compression at temperatures from 1100 1650°C. It was observed that their basal dislocations, main introduced by deformation, dissociated into Shockley partials separated very wide stacking faults, energy of which evaluated be 2.5 ± 0·9 mJ m−2. The...
Because of the development large-format, wide-field cameras, microlensing surveys are now able to monitor millions stars with sufficient cadence detect planets. These new discoveries will span full range significance levels including planetary signals too small be distinguished from noise. At present, we do not understand where threshold is for detecting MOA-2011-BLG-293Lb first planet published surveys, and it also has substantial follow-up observations. This robustly detected in...
Abstract Stacking-fault energies on the {111} plane in ZnTe (zinc blende structure) and (0001) ZnO (wurtzite have been estimated to be 16 ± 4 greater than 43 mJ m−2, respectively, by weak-beam electron microscopy of dislocations. The stacking-fault above crystals previously obtained ones other II-VI compounds, CdTe, CdS, CdSe, ZnSe ZnS, are correlated with material parameters such as ionicity crystal. It is found that together those six III-V compounds so far reported, show a strong...
Abstract A new type of decagonal phase having superlattice order has been found in an AI70Ni15Co15 alloy by means the electron diffraction technique. Most grains Al70Ni15Co15 sample heat treated at 600°C for 216h exhibit order. In contrast, not seen Al65Cu20Co15 phase. The relation between structures with and without is discussed using a four-dimensional description quasicrystalline structure.
Physical properties of DyB 4 have been studied by magnetization, specific heat, and ultrasonic measurements. The magnetic entropy change in intermediate phase II indicate that the degeneracy internal degrees freedom is not fully lifted spite formation order. attenuation huge softening C 44 suggest existence electric-quadrupolar (orbital) fluctuations f -electrons. These unusual originate from a geometrical quadrupolar frustration.
Although many models have been proposed, the physical mechanisms responsible for formation of low-mass brown dwarfs are poorly understood. The multiplicity properties and minimum mass brown-dwarf function provide critical empirical diagnostics these mechanisms. We present discovery via gravitational microlensing two very low-mass, tight binary systems. These binaries directly precisely measured total system masses 0.025 Msun 0.034 Msun, projected separations 0.31 AU 0.19 AU, making them...
The energies of the intrinsic stacking fault in 20 tetrahedrally coordinated crystals, determined by electron microscopy from widths extended dislocations, range a few mJ/m2 to 300 mJ/m2. reduced energy (RSFE: per bond perpendicular plane) has been found have correlations with effective charge, charge redistribution index crystals and c/ aratio wurtzite structure (for many diamond zincblende also reported exist as metastable phase). implication discussed point relative stability between...
Our recent study on the incorporation of Sn in lattice MgAl-layered double hydroxides (LDHs) indicated that about 30 atom % Al3+ could be isomorphously substituted by Sn4+ to form a new MgAlSn ternary LDH. In present study, similar NiAlSn- and CoAlSn-LDHs were synthesized coprecipitation method. The influence thermal transformation redox properties NiAl- CoAl-LDHs their thermally derived products investigated X-ray powder diffraction (XRD), thermogravimetry/differential analyses (TG/DTA),...
A new series of MgIIAlIIISnIV hydrotalcite (HT)-like layered double hydroxides (LDHs) with Mg:Al:Sn = 3:1:0 to 3:0:1 were synthesized for the first time by a simple coprecipitation method at room temperature. The physicochemical properties both as-synthesized and their thermally decomposed products investigated in detail various analytical spectroscopic methods such as powder X-ray diffraction (PXRD), chemical analysis, scanning electron microscopy (SEM), FT-IR spectroscopy, 119Sn 27Al MAS...
A new series of CuCoZnAl layered double hydroxides (LDHs) with various Cu/Co atomic ratios were synthesized by a coprecipitation method at constant pH ≈ 9. The effects Co on the structural properties and reducibility both as-synthesized calcined materials investigated thoroughly employing powder X-ray diffraction (XRD), ultraviolet–visible diffuse-reflectance spectroscopy (UV–Vis DRS), thermogravimetry–differential thermal analysis (TG–DTA), temperature programmed reduction (TPR) methods....
We report analysis of high microlensing event MOA-2008-BLG-379, which has a strong anomaly at its peak, due to massive planet with mass ratio q = 6.9 x 10^{-3}. Because the faint source star crosses large resonant caustic, planetary signal dominates light curve. This is unusual for events, and as result, nature this curve was not immediately noticed. The found when MOA Collaboration conducted systematic study binary events previously identified by alert system. have Bayesian based on...
The magnetic properties of $R{\mathrm{Te}}_{3}$ $(R=\mathrm{Ce},$ Pr, Nd, Gd, Dy), which has a structure consisting the alternate stacking one $R\mathrm{Te}$ layer and two Te layers, were investigated using magnetization electrical resistivity measurements. transition temperatures found at 3.0 K for $R=\mathrm{Ce},$ 3.2 11.5 4.5 Dy, respectively, Pr compound showed van Vleck paramagnetism. ordered moment lies within layer. In contrast, moments $R{\mathrm{Te}}_{2},$ having layer, point to...