Tomoka Koyama

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Using a high temperature superconductor, we have constructed and tested a prototype of superconducting fault current limiter (SFCL). As a requirement for high speed reclosing after interrupting the fault current in the electric power system, when the fault current is interrupted, the back-up breaker is re-closed within 0.3 seconds. Accordingly, the(More)
In this study, Listeria monocytogenes contamination in a cold-smoked fish processing plant in Osaka, Japan, was examined from 2002 to 2004. A total of 430 samples were collected and divided into five categories: raw fish, materials during processing, processing equipment, environment, and finished products. A total of 59 finished products were examined(More)
Many of natural energy power generations create electricity of DC current. On the other hand, many of load sides consume DC converted from AC. Therefore, conversion loss and CO<sub>2</sub> emission may be able to reduce by adopting DC distribution. However, the interruption on DC current becomes difficult because zero point which exists in alternate current(More)
Using a high temperature superconductor, we proposed a model superconducting fault current limiter (SCFCL) with the high-speed commutation switch. The high-speed commutation switch consists of the parallel coil, the electromagnetic repulsion plate and the vacuum interrupter. In this SCFCL, the current in the superconductor is interrupted within 0.5 cycles.(More)
Marine fishes and squids caught in the Gulf of Tongking, the East China Sea and the Yellow Sea were dissected, and many Anisakidae larvae were found in them. The larvae of Anisakis simplex (Anisakis Type I larvae), the most important causative agent of anisakiasis, was found in about 30% of fishes and squids caught in the Gulf of Tongking and in about 60%(More)
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