A5024893666- Corrosion Behavior and Inhibition
- Terahertz technology and applications
- Physics of Superconductivity and Magnetism
- Semiconductor Quantum Structures and Devices
- Spectroscopy and Laser Applications
- Ship Hydrodynamics and Maneuverability
- Ga2O3 and related materials
- GaN-based semiconductor devices and materials
- ZnO doping and properties
- Material Dynamics and Properties
- Quantum and electron transport phenomena
- Magnetism in coordination complexes
- Fluid Dynamics Simulations and Interactions
- Concrete Corrosion and Durability
- Hydrogen embrittlement and corrosion behaviors in metals
- Magnetic and transport properties of perovskites and related materials
- Inorganic Fluorides and Related Compounds
- Electron and X-Ray Spectroscopy Techniques
- Magnetic properties of thin films
- Advanced Condensed Matter Physics
- Luminescence Properties of Advanced Materials
- Aluminum Alloys Composites Properties
- Semiconductor materials and devices
- Ocean Waves and Remote Sensing
- High-Temperature Coating Behaviors
Muroran Institute of Technology
2013-2025
The University of Tokyo
1991-2024
Osaka University
2013-2024
Institute for Molecular Science
2001-2022
Panasonic (Japan)
1996-2021
Niigata University
2019-2020
Institute of Refrigeration
2016
Ebara (Japan)
2016
Toho University
1994-2014
Regional Development Agency
2012
Carboxylic acids, particularly formic and acetic are linked to the premature failure of heating, ventilation, air conditioning systems due localised corrosion known as "ant-nest corrosion." This study examines oxygen-free copper tubes exposed acids (5, 10, 50, 100 ppm) for 20, 40, 60, 80 days. Results revealed that acid causes higher weight loss more aggressive than acid. Cross-sectional analysis showed deep corrosion" structures from acid, contrasting with shallow pits Cyclic voltammetry...
Abstract UVSOR is a Japanese low-energy synchrotron light source that has been operational since 1983. It 750 MeV electron beam energy and circumference of 53 m. The machine undergone two major upgrades now called UVSOR-III, with moderately small emittance 17 nm·rad operated in the top-up mode at 300 mA. six undulators. Three in-vacuum undulators provide high-brightness VUV-SX to beamlines BL3U, BL4U, BL6U. BL3U BL4U are actively used for chemistry life sciences using situ operando...
THz-radiation power from femtosecond-pulse-irradiated InAs is found to be saturated at the magnetic field around 3 T. Additionally, we find that this saturation strongly depends on geometrical layout. Interesting magnetic-field dependence of center frequency for THz radiation also observed.
A tetrahedrally distorted mononuclear copper(II) complex, [Cu(salabza)] 1, and two dinuclear CuLn complexes, [Cu(salabza)Ln(hfac)3] (Ln = Gd 2 or Lu 3), were synthesized their molecular structures determined, where H2salabza Hhfac denote N,N′-bis(salicylidene)-2-aminobenzylamine 1,1,1,5,5,5-hexafluoroacetylacetone, respectively. In complex 1 the deviations of four co-ordinating atoms (O(1), O(2), N(1) N(2)) salabza2− copper atom from least-squares equatorial plane O(1)O(2)N(1)N(2) indicate...
High-electron-mobility transistors (HEMTs) have been demonstrated on both AlN/sapphire templates and sapphire substrates, the dc characteristics of fabricated devices were examined at room temperature. Better with high extrinsic transconductances drain current densities observed in HEMTs grown when compared substrates. Extrinsic 214 137 mS/mm for Wg/Lg=15/2 μm substrates achieved, respectively. The enhancement small variations threshold voltage (⩽130 mV) is due to reduction dislocation...
Individual effective glass transitions of components in miscible blends polystyrene/poly(vinyl methyl ether), poly(o-chlorostyrene)/poly(vinyl and poly(styrene-block-n-butyl acrylate)/polystyrene were detected by temperature-modulated differential scanning calorimetry. These apparently showed broad single their heat capacity (Cp) curves. This result has been widely accepted as a criterion mixing both components. However, the derivative Cp curves some bimodal peaks. indicates coexistence two...
A novel variably polarized angle-resolved photoemission spectroscopy beamline in the vacuum-ultraviolet (VUV) region has been installed at UVSOR-II 750 MeV synchrotron light source. The is equipped with a 3 m long APPLE-II type undulator horizontally/vertically linear and right/left circular polarizations, 10 Wadsworth monochromator covering photon energy range of 6-43 eV, 200 mm radius hemispherical photoelectron analyzer an electron lens +/-18 degrees acceptance angle. Due to low emittance...
A new bending-magnet beamline with a 2.5 m normal-incidence monochromator has been constructed to serve light source in the visible-vacuum-ultraviolet region for photoluminescence, transmission and reflection spectroscopies of solids at UVSOR-III 750 MeV synchrotron radiation source. The aim is pave way establishing high photon flux, brilliance, energy-resolution, linear-polarization low higher-order light. To obtain flux acceptance angle was designed be 40 mrad (H) × 14 (V) post-mirror...
Superparamagnetism was observed in antiferromagnetic MnO ultrafine-particles with the size range of 3.7∼5.4 nm. The decrease Néel temperature these finite systems confirmed by measuring dependence magnetic susceptibility. a moment per atom and particle estimated fitting susceptibility to Curie-Weiss law at higher lower than temperature, respectively. former increased decreasing due surface effect, latter proportion square root number spins as expected particles. coercive force blocking...
A local segmental mobility was determined by electron spin resonance (ESR) spin-label method for a series of polystyrene (PS) with various molecular weights. Each PS specimen selectively spin-labeled stable nitroxide radicals at chain end or inside sites. Molecular motion the compared that from temperature dependence ESR spectra radicals. The transition motion, T5.0mT, which extreme separation width due to 14N anisotropic hyperfine splitting is 5.0 mT, increased an increase in weight. WLF...
We have fabricated intrinsic Josephson junctions for (Bi,Pb) 2 Sr Ca Cu 3 O x thin films and investigated their electronic characteristics. Mesa structures with the are on surface of high-quality prepared by rf-sputtering subsequent heat treatment. The show distinct hysteresis a multiple branching structure periodic voltage jump at current-voltage response. These results demonstrate that mesas consist stacked series SIS junctions. From this structure, 26–28 mV is obtained 2223 phase 4.2 K.
A compact THz-radiation source using an InAs semiconductor is demonstrated with a turn-key femtosecond fiber laser as excitation and newly designed 2 T permanent magnet. By magnetic circuit, magnet which can exceed the remanence field was obtained. This sufficiently intense for absorption spectroscopy.
We investigated the magnetic-field dependence of terahertz (THz) radiation power from InSb. Significant enhancement THz-radiation is observed by using a compact fiber laser that delivered 100 fs optical pulses at center wavelength 1560 nm. Additionally, applying external magnetic fields dramatically enhanced power. reaches maximum value around 1.2 T, and its factor exceeds 100. From an applications viewpoint, this significant finding for practical light source design, since it easily...
Using magnetically enhanced terahertz radiation from InAs, various naphthols, which exhibits estrogenic like activity and are potentially mimic natural hormones, studied. The experimental results show that the depicted by position of hydroxyl (-OH) component at different carbon atom sites naphthalene compound, distinguishable based on absorption THz radiation. It is found strongly related to crystal symmetry dipole moment these isomers.
The design of fluoride-based optical devices for deep ultraviolet applications is discussed. Variations in the band-gap energy and band structure with respect to composition are investigated Li(1−x)KxBa(1−y)MgyF3 perovskites. energy, lattice constant, perovskitelike fluorides estimated based on ab initio calculations within local-density approximation. lattice-matched double heterostructure direct compounds (Li(1−x)KxBa(1−y)MgyF3 either LiBaF3 or KMgF3 substrates) promising fabrication.
Effects of chain ends on the dynamics atactic poly(methyl methacrylate) (PMMA) was studied by spin-label technique. PMMA's with well-defined molecular weights were synthesized atom transfer radical polymerization and selectively labeled at end or inside sites a stable nitroxide radical. The WLF treatment demonstrated that transition temperature, T5.0mT, which an extreme separation width 5.0 mT, reflected glass observed frequency electron spin resonance (ESR). T5.0mT PMMA (T5.0mT,e) ca. 8 K...
Molecular motion at the specific sites of polystyrene-block-poly(methyl acrylate) (PS-block-PMA) forming a lamellar morphology was studied by electron spin resonance (ESR). PS-block-PMA's having nearly same molecular weight and composition were selectively spin-labeled with stable nitroxide radicals different (each free end, inside segments each block, or chemical junction point between blocks). The analyzed from temperature-dependent ESR spectra spin-labels. Enhancement mobility chain end...
High-speed ship operations have a significant risk of the broaching phenomenon when navigating in following/quartering seas. The occurrence this can result violent yaw motion, regardless steering effort. Centrifugal forces due to motion could cause large roll and even capsizing some cases. A necessary condition for is surf-riding phenomenon. Therefore, International Maritime Organization (IMO) has set up criteria include theoretical formulas estimating phenomena. equation used IMO...
The effect of the decrease in coordination number atoms surface on magnetic transition temperature was investigated experimentally and theoretically for CoO ultrafine particles. decreasing tendency Néel T N with average size confirmed range from 2.0 to 3.0 nm through ESR measurement. similar gained calculation mean-field theory using prism model within Ising thin-film model.
Different-Al-content AlxGa1-xN/GaN (0.26≤x≤0.52) high-electron-mobility transistor (HEMT) structures were grown on large-area 100-mm-diameter sapphire substrates by metalorganic vapor phase epitaxy (MOVPE). A low sheet resistance of approximately 380 Ω/sq. and an in-wafer total variation 7.6% with a standard deviation 1.6% obtained for the sample highest Al content 0.52. The two-dimensional electron gas (2DEG) density room-temperature Hall mobility Al0.52Ga0.48N/GaN HEMT 1.76×1013/cm2 971...