A5045124545- Physics of Superconductivity and Magnetism
- Superconducting Materials and Applications
- Superconductivity in MgB2 and Alloys
- ZnO doping and properties
- Magnetic properties of thin films
- Semiconductor materials and devices
- Magnetic and transport properties of perovskites and related materials
- Particle physics theoretical and experimental studies
- Advanced Condensed Matter Physics
- Liver Disease Diagnosis and Treatment
- Metallurgical and Alloy Processes
- Quantum Chromodynamics and Particle Interactions
- Nuclear physics research studies
- Rare-earth and actinide compounds
- Iron-based superconductors research
- Inorganic Fluorides and Related Compounds
- Amino Acid Enzymes and Metabolism
- Magnetic Properties of Alloys
- Metallurgy and Material Forming
- High-Energy Particle Collisions Research
- Renal function and acid-base balance
- Education and Learning Interventions
- Metal and Thin Film Mechanics
- Drug Transport and Resistance Mechanisms
- Diet, Metabolism, and Disease
Aoyama Gakuin University
2016-2025
Kyushu University
1994-2025
Jikei University School of Medicine
2011-2017
The Jikei University Hospital
2016
The University of Tokyo
1968-2015
Nagoya University
2011
Tohoku University
2006
Kyushu Institute of Information Sciences
1994
Carnegie Mellon University
1994
German Research Centre for Artificial Intelligence
1994
There are some biomarkers for asthma diagnosis but they often difficult in clinical use, particularly pediatric cases. Periostin is an extracellular matrix protein, upregulated response to IL-4 or IL-13. Serum periostin expected be used as a non-invasive biomarker and management.Twenty-eight children with (BA) 27 without (patients pectus excavatum, etc. control group) aged 6-16 years were included. Bronchial was diagnosed according International Study of Asthma Allergies Childhood (ISAAC)...
The performance of REBCO melt-textured bulks at middle temperatures, 20–60 K is becoming more important for their high field applications, while most evaluations have focused on trapped properties under liquid nitrogen immersion, 77.3 K, due to the ease measurement. In this study, YBCO and DyBCO disk-shaped were fabricated using Single-Direction Melt Growth (SDMG) method, trapping temperatures evaluated first time. SDMG exhibited excellent as well compared those conventional top-seeded...
Transient coaxial helicity injection (CHI) current start-up in a spherical tokamak (ST) has been demonstrated for the first time using reactor-relevant floating single biased (FSB) electrode configuration on QUEST. Unlike previous applications of CHI HIT-II and NSTX which entire ST vessel was split two toroidal ceramic rings as vacuum breaks, FSB QUEST, only lower outer divertor plate is electrically insulated from rest vessel. This injector region. A discharge generated by driving current,...
For realizing high-Tc cuprate superconductors (HTS) magnets equipped with a persistent current circuit, superconducting joints between HTS tapes are indispensable. In the present study, development of high Ic and Tc Ag-sheathed multi-filamentary Bi2223 commercial were attempted using polycrystalline intermediate joint layers. High above 400 A at 4.2 K in self-field was successfully achieved by formation grain connection layer filaments tape an increase number joined filaments.
Formation of $_{\ensuremath{\Lambda}}^{4}\mathrm{H}$ hypernuclei from ${K}^{\ensuremath{-}}$ absorption at rest on light nuclear targets was studied by measuring monochromatic ${\ensuremath{\pi}}^{\ensuremath{-}}'\mathrm{s}$ the two-body decay, $_{\ensuremath{\Lambda}}^{4}\mathrm{H}\ensuremath{\rightarrow}^{4}\mathrm{He}+{\ensuremath{\pi}}^{\ensuremath{-}}$. The formation probabilities $^{4}\mathrm{He}$, $^{7}\mathrm{Li}$, $^{9}\mathrm{Be}$, $^{12}\mathrm{C}$, and $^{16}\mathrm{O}$ were...
We have developed a single-direction melt growth method in which REBCO melt-textured bulks grow only vertically from seed plate utilizing the difference peritectic temperatures of REBCO. Entirely c-grown YBCO, DyBCO and GdBCO with various sizes shapes were successfully fabricated high reproducibility. Disk-shaped showed trapped fields almost concentric field distributions, reflecting homogeneous boundaryless bulky crystal. In particular, YBCO bulk 32 mm diameter more than 1 T at 77 K....
This paper presents a nanoindentation instrument for 3D micro/nano-structured surfaces made of soft metals such as LSI circuit patterns. The can carry out indentations with high resolution in both the vertical direction (Z) and lateral directions (XY). An electro-polished tungsten probe tip diameter 100 nm is used indenter. indentation motion along Z-direction generated by PZT actuator. sample mounted on free-end steel cantilever. depth load be accurately obtained from displacement,...
We developed and operated a persistent current (PC) mode 9.39 T (400 MHz for <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sup> H NMR) LTS/Bi-2223 NMR magnet using Bi-2223 insert coil with superconducting joint. Firstly, we basic joining procedure to achieve the joint high-strength tape used coil. applied this Secondly, stand-alone PC operation test at 4.2 K was performed. No apparent field decay observed owing Finally, installed inside LTS...
We investigated the effects of high-temperature post-annealing on magnetic field-trapping properties REBa <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Cu xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> O <italic xmlns:xlink="http://www.w3.org/1999/xlink"><sub>y</sub></i> melt-grown bulks composed a single xmlns:xlink="http://www.w3.org/1999/xlink">c</i> -growth domain prepared by single-direction melt growth (SDMG) method....
We investigated ${\ensuremath{\pi}}^{0}$ decay branching ratios $\frac{{\ensuremath{\Gamma}}_{{\ensuremath{\pi}}^{0}}}{\ensuremath{\Gamma}}$ in the weak of $_{\ensuremath{\Lambda}}^{12}\mathrm{C}$ and $_{\ensuremath{\Lambda}}^{11}\mathrm{B}$ hypernuclei using (stopped ${K}^{\ensuremath{-}}$, ${\ensuremath{\pi}}^{\ensuremath{-}}$) reaction. The were estimated to be 0.174\ifmmode\pm\else\textpm\fi{}0.057(stat)\ifmmode\pm\else\textpm\fi{}0.008(syst)...
Undoped, Cl-doped, (Cl, Hf) co-doped and Sn) YBa2Cu3Oy (YBCO) thin films have been prepared by the fluorine-free metal–organic decomposition (FF-MOD) method on SrTiO3(100) single-crystalline substrates. Cross-sectional microstructures of these were investigated in detail using scanning transmission electron microscopy (STEM). Rectangular-shaped oxychloride precipitates (Ba2Cu3O4Cl2) fine particles (BaSnO3) clearly observed films. The magnetic angular dependence critical current density...
Abstract We improved the critical current ( I c ) of superconducting joint between Bi2223 tapes by introducing two-step sintering process. The in-field transport ∼300 A at 4.2 K and 1 T under a 10 −9 Ω criterion was successfully demonstrated. improvement can probably be attributed to enhancement intergrain density for intermediate layer. Ultra-low resistance below −14 also demonstrated using decay measurement. To best our knowledge, this study is first demonstrate practical level ultra-low...
In general, a dense and c-axis grain-oriented microstructure is desirable in order to achieve the high critical current properties of Bi2223 polycrystalline materials. On other hand, our recent studies have shown that precise control chemical compositions also effective for enhancement intergrain Jc. this study, development thick film materials with was attempted by controlling both compositions. A Jc ∼8 kA cm−2 at 77 K ∼40 μmt achieved increasing Pb substitution level Bi site...
Chlorine doped Y123 thin films have been successfully prepared by the fluorine-free metal organic decomposition (FF-MOD) method on SrTiO3(100) single crystal substrates. The rectangular Ba2Cu3O4Cl2 (Ba2342) columns were epitaxially grown in film without degrading crystallinity and transition temperature (Tc) of Y123. Cl-doped maintained high Tc 90.5–91.5 K they showed higher critical current density (Jc) than Cl-free particularly magnetic fields. Jc feature was observed thick up to ~0.93 μm...
Abstract The synthesis conditions of fluorine-free metal–organic decomposition (FF-MOD)-processed YBa 2 Cu 3 O y (YBCO) films on buffered metallic substrates have been systematically investigated. Chlorine addition to the starting solution was found be quite effective for expanding highly c -axis-oriented YBCO films. showing a high critical current, ∼100 A/cm (77 K, ∼0 T), were successfully obtained by sintering at 740 °C, which is ∼50 °C lower than typical temperature FF-MOD-processed This...
Optimizations of sintering conditions, such as <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$P\hbox{O}_{2}$</tex> </formula> , temperature and time, the introduction effective pinning centers were systematically studied to improve critical current properties RE123 thin films prepared by fluorine-free (FF) metal organic decomposition (MOD) method. We found that epitaxial growth Y123 in FF-MOD is...
Since REBCO melt-textured bulks are produced in an extremely carrier underdoped state after melt-growth, oxygen-annealing is required for a few hundred hours to control the oxygen composition throughout due their slow oxygen-diffusivity. In this study, we discovered that time can be largely reduced with introduction of water vapor process Ag-added YBCO without any degradation superconducting properties. It was revealed highly dense stacking faults were induced matrix during wet...
Abstract We developed a simple single-direction melt growth for the fabrication of high-performance REBa 2 Cu 3 O y (RE: rare earth element) melt-textured bulks with selective grain growth. In this method, were epitaxially melt-grown from large plate cut commercial by utilizing different peritectic temperatures . Ag-added YBa three crystallographic orientations ([100], [110], and [001]) successfully prepared. The whole c -grown bulk showed higher trapped field (∼0.39 T) more circular...
Abstract Ring-shaped REBa 2 Cu 3 O y melt-textured bulks have been successfully grown by the single-direction melt growth (SDMG) method. Three homogeneous DyBa ring-bulks were directly in this study, which exhibited concentrically cone-shaped trapped field distribution on surface and a high of 1.84 T at 77 K inside ring, highest ever value among reported ring-shaped to date. Furthermore, superconducting properties such as transitions critical current densities are highly uniform throughout...