A5056169566- Shape Memory Alloy Transformations
- Magnetic and transport properties of perovskites and related materials
- Magnetic Properties and Applications
- Metal and Thin Film Mechanics
- GaN-based semiconductor devices and materials
- ZnO doping and properties
- Intermetallics and Advanced Alloy Properties
- Magnetic Properties of Alloys
- Acoustic Wave Resonator Technologies
- advanced mathematical theories
- Transition Metal Oxide Nanomaterials
- Gas Sensing Nanomaterials and Sensors
- Algebraic and Geometric Analysis
- Heusler alloys: electronic and magnetic properties
- Thin-Film Transistor Technologies
- Creativity in Education and Neuroscience
- Microstructure and Mechanical Properties of Steels
- Meromorphic and Entire Functions
- Analytic and geometric function theory
- Rare-earth and actinide compounds
- High Entropy Alloys Studies
- Holomorphic and Operator Theory
- Metallurgical and Alloy Processes
- Hydrogen Storage and Materials
- Advanced Thermoelectric Materials and Devices
Tohoku University
2016-2025
Hokkaido University
1994-2019
Material (Belgium)
2010-2015
Bandung Institute of Technology
2011
College of Industrial Technology
2005
Nihon University
2005
FZI Research Center for Information Technology
2004
Yokohama National University
2003
Advanced Institute of Materials Science
2001
Fukui University of Technology
1998-2000
Ferromagnetic shape memory alloys Ni$_{2+x}$Mn$_{1-x}$Ga were studied in the range of compositions $0.16 \le x 0.36$. Experimental phase diagram, constructed from differential scanning calorimetry, transport and magnetic measurements, exhibits distinctive feature a compositional interval $0.18 0.27$, where martensitic transitions merge first-order magnetostructural transition ferromagnetic martensite $\leftrightarrow$ paramagnetic austenite. Observed this non-monotonous behavior temperature...
Recent developments on Heusler alloys including Ni–Mn–X and Ni–Co–Mn–X (X = Ga, In, Sn,…) demonstrate multiferroic phase transformations with large abrupt changes in lattice parameters of several percent corresponding ferromagnetic ordering near the transition temperatures. These materials enable a new generation thermomagnetic generators that convert heat to electricity within small temperature difference below 5 K. While thermodynamic calculations this energy conversion method predict...
A new method for thermal energy harvesting at small temperature difference and high cycling frequency is presented that exploits the unique magnetic properties actuation capability of shape memory alloy (MSMA) films. Polycrystalline films Ni 50.4 Co 3.7 Mn 32.8 In 13.1 are tailored, showing a large abrupt change magnetization low hysteresis well above room temperature. Based on this material, free‐standing film device designed exhibits thermomagnetically induced between heat source sink with...
The solution growth method is an economical and environmentally friendly approach to producing aluminum nitride (AlN) single crystals. However, the fluxes used in have low nitrogen solubility, which limits rate of AlN. In this study, as part development a for AlN using Fe–Cr with high experiments were conducted type 430 ferritic stainless steel, composed mainly Fe–Cr, flux. Through series experiments, we report results optimization various experimental parameters (AlN polarity, cooling rate,...
The transformation behavior of Ni–Mn–Ga submicron polycrystalline thin films was investigated with respect to target composition, different substrates, annealing temperature and film thickness. Two series (A B) thicknesses ranging from 0.1 5 µm were deposited onto alumina ceramic, poly-vinyl alcohol (PVA), quartz glass by the RF magnetron sputtering technique. use targets Ni49.5Mn28.0Ga22.5 Ni52Mn24Ga24 facilitated formation 10M 14M martensitic structures for heat treated A B, respectively....
In this letter, the analysis of magnetocaloric effect (MCE) in a thin film Ni–Mn–Ga alloy sputter deposited on alumina substrate is reported. This has 0.4 μm thickness and exhibits merged martensitic ferromagnetic transitions. The temperature dependence dc magnetization under different constant applied magnetic fields been measured. calculated MCE up to 60 kOe shows feasibility these materials be implemented refrigeration system for functional microsystems. addition, shift transformation...
Abstract Polyunsaturated fatty acids (PUFAs) such as docosahexaenoic acid (DHA) and eicosapentaenoic (EPA) are essential acids. PUFA synthases composed of three to four subunits each create a specific without undesirable byproducts. However, detailed biosynthetic mechanisms for controlling final product profiles have been obscure. Here, the bacterial DHA EPA were carefully dissected by in vivo vitro experiments. In analysis with two KS domains (KS A C ) acyl‐acyl carrier protein (ACP)...
Differential scanning calorimetry (DSC) and magnetic measurements were performed to study the influence of ferromagnetic 3-d transition elements Fe Co on structural properties shape memory alloys Ni2MnGa. Addition or Ni sites decreases temperature martensitic phase Tm, whereas addition Mn results in a considerable increase Tm. Magnetic measurement revealed that Curie TC increases upon substitution for Ni. This observation is importance design high alloys.
Aluminum nitride (AlN) is a promising material for use in applications such as ultraviolet light-emitting diodes and surface acoustic wave devices. In this study, AlN layers were fabricated on nitrided sapphire substrates using radio-frequency (RF) reactive magnetron sputtering. An layer sputtered 50 vol% N2 with sputter power of 900 W at 823 K exhibited X-ray rocking curves (0002) (10-12) the best full width half-maximum 61 864 arcsec, respectively. The c-axis lattice constant expanded...
The object of this paper is an investigation existence problems and Dirichlet on abstract Riemann surface in the sense Weyl-Radó or a covering over it, boundary correspondence conformal mapping surface.
Abstract Aluminum nitride (AlN) is a promising material for use in applications such as deep-ultraviolet light-emitting diodes (UV-LEDs) and surface acoustic wave (SAW) devices. In the present study, effect of sputtering pressure on morphology, crystalline quality, residual stress AlN films deposited at 823 K nitrided -plane sapphire substrates, which have high-crystalline-quality c thin layers, by pulsed DC reactive was investigated. The -axis-oriented were homoepitaxially grown substrates...
Abstract MoSiBTiC alloys are promising candidates for next-generation ultrahigh-temperature materials. However, the phase diagram of these has been unknown. We have developed an thermal analyser based on blackbody radiation that can be used to analyse melting and solidification alloy 67.5Mo–5Si–10B–8.75Ti–8.75 C (mol%). Furthermore, electromagnetic levitation (EML) was in-situ observation microstructural study alloy. On basis results, following pathway is proposed: Mo solid solution (Mo ss )...
The present work focuses on gaining a systematic understanding of the microstructure variation and solidification reactions alloys in Mo-rich portion Mo–Mo5SiB2(T2)–TiC pseudo-ternary system. A series MoSiBTiC with 9 mol% T2 were selected from vicinity Mo–TiC binary ternary eutectic point to carefully examine pathway phase diagram. reaction temperature was detected via an ultra-high-temperature thermal analysis method using blackbody radiation. Solidification observed situ electromagnetic...
Ni–Al alloys are good candidates for the fabrication high-efficiency gas turbine blades. The system is also important as a solution AlN crystal growth. To accurately model casting process blade and design growth techniques AlN, thermophysical properties of liquid alloy required. In this study, normal spectral emissivity was measured using electromagnetic levitation technique under static magnetic field. Both melting temperature Cu eutectic Ni–C were used fixed points spectrometer calibration...