A5101614804- Particle accelerators and beam dynamics
- Welding Techniques and Residual Stresses
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Semiconductor materials and devices
- GaN-based semiconductor devices and materials
- Silicon Carbide Semiconductor Technologies
- Structural Engineering and Vibration Analysis
- Metal and Thin Film Mechanics
- Microstructure and Mechanical Properties of Steels
- Vibration Control and Rheological Fluids
- Advanced Welding Techniques Analysis
- Metal Alloys Wear and Properties
- Hydrogen embrittlement and corrosion behaviors in metals
- Astrophysics and Cosmic Phenomena
- Advanced Chemical Physics Studies
- Gamma-ray bursts and supernovae
- Advancements in Semiconductor Devices and Circuit Design
- Atomic and Molecular Physics
- Corrosion Behavior and Inhibition
- Mass Spectrometry Techniques and Applications
- Polymer Nanocomposites and Properties
- Pulsars and Gravitational Waves Research
- Ga2O3 and related materials
- Particle physics theoretical and experimental studies
Aoyama Gakuin University
2023
Japan Proton Accelerator Research Complex
2021
NSK (United States)
2003-2020
Hitachi (Japan)
1998-2019
Japan Aerospace Exploration Agency
2016-2019
High Energy Accelerator Research Organization
2004-2018
Kyoto University
2018
Chulalongkorn University
2018
Osaka City University
2004-2017
Tohoku University
1995-2017
We have studied stars in nuclear emulsion due to the capture at rest of Ξ- hyperons produced (K-, K+) reaction. The sequential weak decay a double hypernucleus (nucleus with S = -2) has been directly observed. is assigned as either 10ΛΛBe or 13ΛΛB. This assignment excludes existence H dibaryon lighter than 2203.7 ±0.7 MeV/c2.
In this paper, we successfully demonstrate an AlGaN HFET with a high breakdown voltage of over 1.8 kV on 4 inch Si substrates. order to obtain the and improve crystalline quality GaN layers, thick epitaxial layer including buffer total thickness 6 mum was grown. The maximum drain current were achieved be 120 A, respectively. Furthermore, suppression collapse phenomenon is examined. on-resistance not so significantly increased up off-bias-stress 1.0 kV.
The absorption spectra of atomic Xe, Cs and Ba have been determined at the 3d threshold. broad to epsilon f bands Xe change into sharp 4f lines for Ba, clearly manifesting collapse f-symmetric final-state wavefunction excited Ba.
The 2pπ*–3dπ interaction in the excited state of aromatic silanes has been studied by means absorption and emission spectroscopy. Broad structureless fluorescence spectra phenyldisilanes naphthyldisilanes with large Stokes shifts have observed they attributed to emissions from intramolecular charge-transfer (c.t.) states dipole moments. Evidence that c.t. originates 1(2pπ, 3dπ) produced 2pπ*(aromatic ring)→ 3dπ(Si—Si bond) charge transfer is given effect steric twisting on emission. It shown...
A double-$\Lambda$ hypernucleus, ${}_{\Lambda\Lambda}\mathrm{Be}$, was observed by the J-PARC E07 collaboration in nuclear emulsions tagged $(K^{-},K^{+})$ reaction. This event interpreted as a production and decay of $ {}_{\Lambda\Lambda}^{\;10}\mathrm{Be}$, ${}_{\Lambda\Lambda}^{\;11}\mathrm{Be}$, or ${}_{\Lambda\Lambda}^{\;12}\mathrm{Be}^{*}$ via $\Xi^{-}$ capture ${}^{16}\mathrm{O}$. By assuming atomic 3D state, binding energy two $\Lambda$ hyperons$\,$($B_{\Lambda\Lambda}$) these...
Photoionisation of Ca atoms has been investigated by means a time-of-flight mass spectrometer coupled with source monochromatised synchrotron radiation and an atomic beam. Relative photoionisation cross sections (q+ for single q2+ double photoionisation, as well the ratio R=q2+/q+) have measured in wavelength range 35-42 nm 0.15 bandwidth. Comparison photoabsorption data Mansfield Newsom (1977) shows good correspondence peak structure between absorption resonance Ca2+ yield proton energies...
Antibacterial properties of 21 metallic elements used as alloying (Al, Si, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Zr, Nb, Mo, Pd, Ag, Sn, Ta, W, Pb, Au, Pt) was studied. Escherichia coli (Gram-negative bacteria) and Staphylococcus aureus subsp. (Gram-positive were model bacteria. The film attachment method adopted for evaluation antibacterial activity, Japan industrial standard Z 2801:2000 applied the criterion evaluate antimicrobial abilities samples. Silver Cu showed strong bactericidal effects...
We have demonstrated n-channel gallium nitride (GaN) MOSFETs using a selective area growth (SAG) technique and ion implantation on silicon substrate. Both realized good normally off operations. The MOSFET the SAG showed large drain current of 112 mA/mm, lower leakage current, high field mobility 113 cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> /V . s, which is, to our knowledge, best for GaN
Microbiologically Influenced Corrosion (MIC), otherwise coined as biocorrosion, is the influence of microorganisms on kinetics corrosion processes metals, minerals and synthetic materials caused by their adhesion growth. A closer observation MIC failure case analyses engineering components showed that occurs at or near welds. Preferential bacterial attack austenite phase leaving a skeleton like appearance commonly reported The initial step this phenomenon attachment bacteria, which, over...
The slow cycling main ring synchrotron (MR) is located the furthest downstream in J-PARC accelerator cascade. It became available for user operation 2009 and provides high-intensity 30 GeV proton beams various experiments on particle nuclear physics. MR has two beam extraction systems: a fast system delivery to neutrino line of Tokai-to-Kamioka (T2K) experiment hadron experimental hall. After nine-month shutdown during recovery from Great East Japan Earthquake, facility resumed December...
We have developed a capacitive fingerprint sensor chip using low-temperature poly-Si thin film transistors (TFTs). obtained good images which sufficient contrast for certification. The comprises circuits, drive and signal processing circuit. new cell employs only one transistor plate within cell. There is no leakage current to other cells by unique sensing method. output of this an analog wave the designed maximum level almost equal TFT's threshold voltage, 2-3 V TFTs. used glass substrate...
This paper reports on the optical properties, outgassing rate, and cryogenic performance of surface finishing we have adopted for large baffles absorbing stray light in KAGRA, an advanced interferometer detecting gravitational waves. The is based electroless nickel-phosphorus-tungsten (NiPW) plating, applicable to area up ~ 800 mm diameter, achieves less than 3% total reflectance against a beam at 1064 nm with reasonable scattering distribution 0.05/sr. rate from black coating meets our...
In this work, the microstructural changes occurring during cooling of friction-stir welded aluminum alloy AA1100 were evaluated. To end, welding (FSW) was performed in a wide range rates 20–62 K/s and evolved microstructures studied by using electron backscatter diffraction. Below 0.6 Tm (Tm being melting point), stir zone material found to experience no significant cooling. At higher FSW temperatures, however, notable occurred material, including grain growth, sharpening texture, reduction...
H. Shizuka, Y. Sato, M. Ishikawa and Kumada, J. Chem. Soc., Commun., 1982, 439 DOI: 10.1039/C39820000439
Nuclear interactions at a mean energy of about 20 TeV are studied by means nuclear emulsion chamber with jet producer. In the present analysis, particular emphasis is placed on experimental condition. The transverse momentum spectrum secondary γ rays approximated single exponential in range 0.3< p tγ <1.2 GeV/c. π 0 mesons estimated to be 0.44±0.02 fractional rays, E / Σ , 0.003< <0.7, not represented exponential, but expected assumption that parent mesons, f = becomes (d N /d )∝exp (- )....