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Characteristics of a Pulse-link Inverter for Fuel Cells
Kentaro Fukushima,Tamotsu Ninomiya,Isami Norigoe,Yosuke Harada,Kenta Tsukakoshi,Zheng Dai 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
This paper proposes a novel DC-AC converter topology for fuel cells. This topology provides pulsed voltage to PWM inverter directly. As the results, it will be possible to reduce the size of this component because of no need for smoothing circuit between boost converter and PWM inverter. Furthermore, this topology is expected to achieve ZVS of the PWM switches because pulsed voltage has certainly zero voltage period in the switching period. This paper analyzes the novel topology called Pulse-link inverter. And it is shown the advantage the converter by the experimental results.
Quantitative Analysis of ″Polymer-Balls″ in Aqueous Solutions by Small-Angle Neutron Scattering
Shibayama, Mitsuhiro,Okabe, Satoshi,Nagao, Michihiro,Sugihara, Shinji,Aoshima, Sadahito,Harada, Tamotsu,Matsuoka, Hideki The Polymer Society of Korea 2002 Macromolecular Research Vol.10 No.6
The quantitative analysis of polymer micelles consisting of amphiphilic block copolymers was carried out by small-angle neutron scattering (SANS). The block copolymers, made of poly(2-ethoxyethyl vinyl ether-b-2-hydroxyethyl vinyl ether)(poly(EOVE-b-HOVE)), exhibited a sharp morphological transition from a homogeneous solution to a micelle structure with increasing temperature. This transition is accompanied by a formation of spherical domains of poly(EOVE) with a radius around 200 $\AA$. The variations of the size and its distribution of the domains were investigated as a function of polymer concentration and temperature. The validity of SANS analysis, including the wavelength- and incident-beam-smearing effects of the SANS instrument, was examined with a pre-calibrated polystyrene latex.