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Fluorinated Metal Hydrides for the Catalytic Hydrolysis of Metal - Hydrogen Complexes
Suda, S,Zhou, Y,Sun, Y M,Uchida, M,Liu, B H,Mormitu, S,Arai, K,Tsukamoto, N,Candra, Y,LI, Z P 대한금속재료학회(대한금속학회) 2001 METALS AND MATERIALS International Vol.7 No.1
This paper is related to the hydrogen storage (H-storage) system composed of an alkaline solution that contains metal-hydrogen complex ions. The BH₄^--complex ions stabilized when it is dissolved in aqueous KOH or NaOH to form homogeneous solutions. However, it is necessary to apply an appropriate catalyst for a high rate generation of hydrogen under atmospheric pressure and temperature conditions. The authors intended to develop catalysts suitable for the hydrolysis of BH₄^--complex ion solutions and found that Mg₂Ni exhibits excellent catalytic functions in the hydrolysis, in particular, after the fluorination treatment (F-treatment). In this work, the effects of F-treatment on the rates of hydrolysis were evaluated between the hydrided and unhydrided Mg₂Ni. No hydrogenation in addition to F-treatment is required in view of hydrolysis kinetics and cost-effectiveness.
H. Uchida,K. Tanizaki,A. B. Khanikaev,A. A. Fedyanin,P. B. Lim,M. Inoue 한국자기학회 2006 Journal of Magnetics Vol.11 No.3
We fabricated new one-dimensional magnetophotonic crystal (1D-MPC) utilizing the second and third photonic band gaps where localized modes existed. Structure of the 1D-MPC was (Ta₂O?/SiO₂)?/Bi:YIG/(SiO₂/Ta₂O?)? with optical thicknesses of 3 λ/4 for Ta₂O? and SiO₂ dielectric layers and λ/2 for Bi:YIG defect layer, where λ is a wavelength of a localized mode in the second photonic band gap. Faraday rotation at the localized mode in the second photonic band gap was enhanced, which was confirmed by calculation using 4×4 matrix method.
Tanaka, H.,Uchida, M.,Maekawa, T.,Bae, Y.-S.,Joung, M.,Jeong, J.H. IOP 2016 Nuclear fusion Vol.56 No.4
<P>An experiment on non-inductive plasma current start-up by electron cyclotron (EC) heating and current drive (ECH/ECCD) has been carried out on KSTAR by injecting the fundamental O-mode wave from the low-field side obliquely to the toroidal magnetic field. A plasma current up to 14.5 kA is generated by 180 kW of 84 GHz microwave power and the magnetic measurement shows the formation of a large last-closed flux surface with a diameter of 0.4 m. The soft x-ray emission profile and fast CCD images also support the existence of closed flux surfaces. The current of the cross-field-passing electrons (CFPEs) is calculated according to the paper <I>Nucl. Fusion</I> <B>52</B> 083008 in these experimental conditions, and it is shown that a CFPE current can produce the initial closed flux surfaces. The observed large increase of EC emission supports the generation of energetic electrons, like CFPEs. After the formation of the closed flux surfaces, the pressure-driven current and CFPE current do not flow in the closed flux surfaces. EC-driven current should flow in these surfaces and ramp up the plasma current. It is estimated that an EC-driven current of about one third of the total plasma current flows in the closed flux surface at the last stage.</P>