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오늘 본 자료
Development of a Plasma Control System for Steady-state Operation on QUEST
Makoto Hasegwa,Kazuo Nakamura,Hideki Zushi,Kazuaki Hanada,Akihide Fujisawa,Keisuke Matsuoka,Hiroshi Idei,Yoshihiko Nagashima,Kazutoshi Tokunaga,Shoji Kawasaki,Hisatoshi Nakashima,Aki Higashijima 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.8
A drift error correction technique with machine vision and a real-time equilibrium calculation codehave been developed on the QUEST (Q-shu university experiment with the steady-state sphericaltokamak) for steady-state operation. The drift error caused by the long time-integration of magneticraw signals has to be removed. With a captured image of the plasma’s cross section, the plasma’sposition is identified by use of image filters. The measured magnetic flux values are corrected to thecalculated flux values estimated by using this plasma position. The correction with the capturedimage work as expected in the preliminary result using a flashlight instead of a plasma.
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.