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Semiconductor Behavior of Passive Films Formed on Cr with Various Additive Elements
Tsuchiya, Hiroaki,Fujimoto, Shinji,Shibata, Toshio 한국부식방식학회 2003 Corrosion Science and Technology Vol.2 No.1
Photoelectrochemical response and electrochemical impedance behavior was investigated for passive film formed on sputter-deposited Cr alloy in 0.1 kmol·m^(-3). Photoelectrochemical action spectrum could be separated into two components, which were considered to be derived from Cr₂O₃ (E_g ∼ 3.6 eV) and Cr(OH)₃, (E_g ∼ 2.5 eV). The band gap energy, E_g, of each component was almost constant for various applied potentials, polarization periods and alloying additives. The photoelectrochemical response showed negative photo current for most potentials In the passive region. Therefore, the photo current apparently exhibited p-type semiconductor behavior. On the other hand, Mott-Schottky plot of the capacitance showed positive slope, which means that passive film formed on Cr alloy has n-type semiconductor property. These apparently conflicting results are rationally explained assuming that the passive film on Cr alloy formed in the acid solution has n-type semiconductor property with a fairly deep donor level in the band gap and forms an accumulation layer in the most of potential region in the passive state.
Koinuma, Shoichi,Fujimoto, Yu,Hayashi, Yasuhiro,Shinji, Takao,Watanabe, Yosuke,Tadokoro, Masayuki The Korean Institute of Electrical Engineers 2014 The Journal of International Council on Electrical Vol.4 No.2
The installation of residential fuel cell systems (FCs) with photovoltaic generation systems (PVs) in residences has begun in Japan. Because of the reverse power flow from PVs, the line voltage may exceed the proper range during daytime operation. In addition, because residential PVs are connected to a single-phase distribution system, the voltage imbalance rate may increase. Here, we focus on an FC with a large available capacity during the daytime, so as to adjust the voltage by reactive power control with the available capacity of the FC. We propose a method of reactive power control that uses the available capacity of FCs to improve the voltage magnitude and voltage imbalance rate in a distribution network.
Spin-wave eigenmodes in single disk-shaped FeB nanomagnet
Cho, Jaehun,Miwa, Shinji,Yakushiji, Kay,Tamaru, Shingo,Kubota, Hitoshi,Fukushima, Akio,Fujimoto, Satoshi,Tamura, Eiiti,You, Chun-Yeol,Yuasa, Shinji,Suzuki, Yoshishige American Physical Society 2016 Physical Review B Vol.94 No.18
<P>Spin-wave eigenmodes in a disk-shaped FeB nanomagnet were investigated using magnetic tunnel junctions with a FeB magnetic layer and MgO barrier. Noise spectrum measurements for a perpendicularly magnetized junction of 120 nm in diameter showed thermal excitation of distinct spin-wave modes. The measured spectra were compared with analytical calculations and numerical simulations. As a result, the observed modes were classified as spin-wave eigenmodes with various nodal circles and nodal diameter modes by taking into account splitting between directional spin-wave modes originating from dynamic dipolar interaction instead of Dzyaloshinskii-Moriya interaction. These results provide a fundamental understanding of spin dynamics in nanosize spintronic devices.</P>
Novel Hybrid Hydroxyapatite Spacers Ensure Sufficient Bone Bonding in Cervical Laminoplasty
Nobuhiro Tanaka,Kazuyoshi Nakanishi,Naosuke Kamei,Toshio Nakamae,Shinji Kotaka,Yoshinori Fujimoto,Mitsuo Ochi,Nobuo Adachi 대한척추외과학회 2018 Asian Spine Journal Vol.12 No.6
Study Design: Prospective observational study. Purpose: This prospective analysis aimed to evaluate the efficacy and bone-bonding rate of hybrid hydroxyapatite (HA) spacers in expansive laminoplasty. Overview of Literature: Various types of spacers or plates have been developed for expansive laminoplasty. Methods: Expansive open-door laminoplasty was performed in 146 patients with cervical myelopathy; 450 hybrid HA spacers and 41 autogenous bone spacers harvested from the spinous processes were grafted into the opened side of each lamina. The patients were followed up using computed tomography (CT), and their bone-bonding rates for hybrid HA and autogenous spacers, bone-fusion rates of the hinges of the laminae, and complications associated with the implants were then examined. Results: Clinical symptoms significantly improved in all patients, and no major complications related to the procedure were noted. The hybrid HA spacers exhibited sufficient bone bonding on postoperative CT. The hinges completely fused in over 95% patients within 1 year of the procedure. Only 4 spacers (0.9%) developed lamina sinking, and most expanded laminae maintained their positions without sinking or floating throughout the follow-up period. Conclusions: Hybrid HA spacers contributed to high bone-fusion rates of the spacers and hinges of the laminae, and no complications were associated with their use. Cervical laminoplasty with these spacers is safe and simple, and it yields sufficient fixation strength while ensuring sufficient bone bonding during the immediate postoperative period.