A5071097249- Superconductivity in MgB2 and Alloys
- Physics of Superconductivity and Magnetism
- Iron-based superconductors research
- Fatigue and fracture mechanics
- Magnetic properties of thin films
- Microstructure and Mechanical Properties of Steels
- Laser-induced spectroscopy and plasma
- Magnetic Properties of Alloys
- Metallic Glasses and Amorphous Alloys
- Laser-Plasma Interactions and Diagnostics
- Advanced materials and composites
- Fusion materials and technologies
- Aluminum Alloys Composites Properties
- Atomic and Molecular Physics
- Rare-earth and actinide compounds
- Electromagnetic wave absorption materials
- Microstructure and mechanical properties
- Magnesium Alloys: Properties and Applications
- Magnetic Properties and Applications
- X-ray Diffraction in Crystallography
- Superconducting Materials and Applications
- Lightning and Electromagnetic Phenomena
- Laser Design and Applications
- Plasma Diagnostics and Applications
- Machine Learning in Materials Science
Kyushu University
2009-2025
Osaka University
2004-2025
Osaka University of Pharmaceutical Sciences
2025
Japan Science and Technology Agency
2024
Tohoku University
2013-2023
Nippon Steel (Japan)
2012-2023
Nihon University
2002-2022
Nitto (Japan)
2020
Japan Synchrotron Radiation Research Institute
2020
SPring-8
2020
Increasing dissipation-free supercurrent has been the primary issue for practical application of superconducting wires. For magnesium diboride, MgB2, carbon is known to be most effective dopant enhance high-field properties. However, critical role remains elusive, and also low-field current density not improved. Here, we have undertaken malic acid doping MgB2 find that microscopic origin enhancement properties due boron vacancies associated stacking faults, as observed by high-resolution...
Tetrataenite (L10-FeNi) is a promising candidate for use as permanent magnet free of rare-earth elements because its favorable properties. In this study, single-phase L10-FeNi powder with high degree order was synthesized through new method, nitrogen insertion and topotactic extraction (NITE). the FeNiN, which has same ordered arrangement L10-FeNi, formed by nitriding A1-FeNi ammonia gas. Subsequently, FeNiN denitrided reaction to derive an parameter 0.71. The transformation disordered-phase...
Controlling the feature sizes of 3D bicontinuous nanoporous (3DNP) materials is essential for their advanced applications in catalysis, sensing, energy systems, etc., requiring high specific surface area. However, intrinsic coarsening naturally reduces leading to deterioration physical properties over time, even at ambient temperatures. A novel 3DNP material beating universal relationship thermal reported via high-entropy alloy (HEA) design. In newly developed TiVNbMoTa HEAs, structure...
Abstract The microstructure is a critical factor governing the functionality of ceramic materials. Meanwhile, microstructural analysis electron microscopy images polycrystalline ceramics, which are geometrically complex and composed countless crystal grains with porosity secondary phases, has generally been performed manually by human experts. Objective pixel-based (semantic segmentation) high accuracy simple but step for quantifying microstructures. In this study, we apply neural...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Y. Shimada, H. Nishimura, M. Nakai, K. Hashimoto, Yamaura, Tao, Shigemori, T. Okuno, Nishihara, Kawamura, A. Sunahara, Nishikawa, Sasaki, Nagai, Norimatsu, S. Fujioka, Uchida, N. Miyanaga, Izawa, C. Yamanaka; Characterization of extreme ultraviolet emission from laser-produced spherical tin plasma generated...
Abstract During fast‐charging, uneven lithium plating on the surface of commercial graphite anode impedes electrochemical performance lithium‐ion batteries, causing a safety issue. The formation passivation layer, solid‐electrolyte interphase (SEI), due to side reactions with organic electrolyte, correlates long‐term cycling under fast‐charging conditions, necessitating comprehensive analysis. Herein, it is demonstrated that molybdenum disulfide (MoS 2 ) coating natural (NG) modulates...
Considering the demand for organosulfur materials and challenges associated with currently used oxidation processes, in this study, we evaluated counter-cation of sodium chlorite (Na+ClO2 -) tetrabutylammonium chloride (Bu4N+Cl-) to synthesise (Bu4N+ClO2 -). Bu4N+ClO2 - exhibited good solubility organic solvents like chloroform (5.2 mol L-1) ethyl acetate (2.8 L-1). The oxygenation reaction organosulfides was examined an HCl-acidic solution under ambient conditions, selectively forming...
We study non-local operators for analyzing the Higgs-confinement phase transition in lattice gauge theory. Since nature of is topological, its order parameter expectation value operators, such as loop and surface operators. There exist several candidates Adopting charge-2 Abelian Higgs model, we test numerical simulation conventional ones, Polyakov 't Hooft loop, an unconventional one, Aharonov-Bohm defined by Wilson wrapping around a vortex line.
Abstract Characterizing molten corium–concrete interaction (MCCI) fuel debris in Fukushima reactors is essential to develop efficient methods for its removal. To enhance the accuracy of microscopic observation and focused ion beam (FIB) microsampling MCCI debris, we developed a three-dimentional FIB scanning electron microscopy (SEM) technique with multiphase positional misalignment (MPPM) correction method. This system automatically aligns voxel positions, corrects contrast, removes...
Abstract We study non-local operators for analyzing the Higgs-confinement phase transition in lattice gauge theory. Since nature of is topological, its order parameter expectation value operators, such as loop and surface operators. There exist several candidates Adopting charge-2 Abelian Higgs model, we test numerical simulation conventional ones, Polyakov ’t Hooft loop, an unconventional one, Aharonov-Bohm defined by Wilson wrapping around a vortex line.
Noise suppression in downsized circuits utilizing magnetic granular films is demonstrated. Films of Fe-Al-O with thickness 2 /spl mu/m which exhibit very high mu/" dispersion the quasimicrowave band were found to work as noise suppressors. The attached onto a micro-strip line and transmission characteristics compared. This first verify that only can play role frequency conduction band. results suggest possibility thin film suppressors be integrated into micron scale semiconductor circuits.
A step for “two-in-one”! steplike molecule (see picture) was synthesized as a carrier transport material layered OLED devices. This double-pillared combines the π system of aromatic hydrocarbons with σ silicon in single structure and transports both holes electrons device. Detailed facts importance to specialist readers are published ”Supporting Information”. Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted by authors. Please note: The publisher is...
Owing to high resistivity and inplane uniaxial anisotropy, granular films are known exhibit permeability at radio frequencies. But this is not enough suppress eddy current when they used gigahertz Recent developments solve problem described. One patterning the films. It effective control anisotropy current. Another deposition of by evaporation. A peculiar fiber structure formed for which very realized. Finally, a study using these as near-field electromagnetic noise absorbers described, it...
Iron-based superconductors are expected to be used in strong magnet applications owing their excellent superconducting properties. The process of sintering a mechanically alloyed precursor powder is effective achieving high upper critical field and current density BaFe2As2 (Ba122) polycrystalline bulk materials. However, when this applied K-doped Ba122, which shows the highest temperature Ba122 family, suppressing vaporization potassium challenging. In study, spark plasma (SPS) method was...
Abstract Iron-based high-temperature (high- T c ) superconductors have good potential to serve as materials in next-generation superstrength quasipermanent magnets owing their distinctive topological and superconducting properties. However, unconventional high- superconductivity paradoxically associates with anisotropic pairing short coherence lengths, causing challenges by inhibiting supercurrent transport at grain boundaries polycrystalline materials. In this study, we employ machine...
The deracemization of secondary benzylic alcohols proceeds successfully by a two-step process with the appropriate combination two different ruthenium complexes for catalysis in first oxidation and second reduction steps. sequential catalytic system provides novel approach to obtaining optically active alcohols, including diols, high yields excellent enantioselectivity (up 95% ee), contrast conventional kinetic resolution racemic alcohols.
In this study, the microstructure of polycrystalline Co-doped BaFe2As2 superconducting bulks was comprehensively analyzed. The synthesis process involved ball milling and subsequent spark plasma sintering (SPS). A strong correlation between conditions observed. Specifically, when mechanochemical raw metal powders carried out at a energy (EBM) 100 MJ/kg, resulting Co-BaFe2As2 bulk contained nanograins with high density planar defects exhibited critical current (Jc) under both magnetic...
Enhancing the mobility of lithium-ions (Li
Abstract Superconducting magnets based on high-temperature superconductors (HTSs) have become critical components in cutting-edge technologies such as advanced medical applications. In HTSs, weak links of superconductivity are inevitable at high-angle grain boundaries (GBs). Thus, two adjacent grains should be crystallographically aligned within the angle ( θ c ), for which intergrain current density J ) starts to decrease exponentially. The several iron-based (IBSs) is larger than that...