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The electric power is indispensable and its stable supply is always expected. A stable supply needs the real-time observation of load conditions by measurement of power factor. In addition, the various faults have been caused from the harmonic voltage and current. In the authors' laboratory, the sensor, which simultaneously measures both the waveforms of the voltage and current without contacting...
The flux density distributions in sintered Bi2Sr2CaCu2Ox high-Tc superconducting specimens were observed by means of a magnetooptic method using iron garnet films. The samples were formed into discs with thicknesses of 60 to 600 ??m and a diameter of 1.5 mm. SEM images showed that specimens consisted of grains with diameters of order 300 ??m. Flux penetrated inhomogeneously into specimens of thickness...
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