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BEGINNING OF SUPERCONDUCTING POWER ELECTRONICS DEVICES(S-PED)
Tsutomu Hoshino,Hnoshi Tsukiji,Masahiro Tsukiyanma,Itsuya Muta,Morio Suzuki 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
The superconducting permanent current switch (PCS) is an important component to build MRI system. This switch uses a thermal and / or magnetic super-to-normal phase transition of the superconductor Unfortunately, it was not designed using with line frequency We made some superconducting power electronics devices operating up to 100 Hz. The results of development and preliminary studying of the heat controlled S-PED up to line frequency are presented. The circuit including these devices have to be designed as current source oriented.
Pumping-up Current Characteristics of Linear Type Magnetic Flux Pump
Chung, Yoondo,Muta, Itsuya,Hoshino, Tsutomu,Nakamura, Taketsune,Ko, Taekuk The Korea Institute of Applied Superconductivity a 2004 한국초전도저온공학회논문지 Vol.6 No.2
The linear type flux pump aims to compensate a little bit decremental persistent current of the HTS magnet in NMR and MRI spectrometers. The flux pump mainly consists of DC bias coil, 3-phase AC coil and Nb foil. The persistent current in closed superconductive circuit can be easily adjusted by the 3-phase AC current, its frequency and the DC bias current. In the experiment, it has been investigated that the flux pump can effectively charge the current in the load coil of 543 mH for various frequencies in 18 minutes under the DC bias of 10 A and the AC of 5 $A_{rms}$. The maximum magnitudes of pumping current and load magnet voltage are 0.72 A/min and 20 ㎷, respectively. Based on simulation results by the FEM are proved to nearly agree with experimental ones.
Tetsuo Gotoh,Tomoko Korenaga,Satomi Ikejima,Tsutomu Hoshino 한국응용곤충학회 2008 한국응용곤충학회 학술대회논문집 Vol.2008 No.10
Population density of the citrus red mite, Panonychus citri (McGregor), in Japanese pear orchards remained low until mid-August, even after inoculation of pear leaves with a considerable number of adult female P. citri from May onwards. This raised the possibility that pear leaves contain a natural compound that suppresses an increase of P. citri populations. The rate of development from larva to adult was significantly lower on leaves collected in July than on leaves collected earlier or later, in several years. The population suppression was caused by molting inhibition and ovicidal activity, according to our close observation in the laboratory [Gotoh and Kubota (1997) Exp. Appl. Acarol. 21: 343-356]. To clarify whether a natural pear compound caused this molting inhibition, a methanol crude extract of pear leaves was isolated and added to a newly developed artificial diet, consisting of sodium caseinate, sucrose, levulose, glucose and inositol. The compound extracted from pear leaves resulted in the molting inhibition as observed on pear leaves. Based on infrared and NMR spectral analysis, the compound extracted from pear leaves closely resembled the synthetic acaricide hexythiazox. Furthermore, the LC50-values of the compound extracted from pear leaves for ovicidal activity of P. citri eggs and for inhibition of molting to protonymphs were similar to those of hexythiazox. These results strongly suggest that the molting deterrent extracted from pear leaves was in fact hexythiazox, an acaricide in use on pear trees, rather than a natural product. This suggestion becomes even stronger, considering that the molting inhibition was observed in a hexythiazox-spray year, but not in a non-spray year.