The assembled domain structure model (ADSM) is a multiscale magnetization model to simulate the magnetic properties of a core material. To physically represent the pinning type hysteresis using the ADSM, this paper develops a pinning field model formulated from on the microscopic distribution of pinning strength. Two methods are presented to implement the derived pinning field model in the ADSM. One represents the vector pinning field using the vector stop model, which depend on the magnetization vector. The other directly relates the domain-wall motion to the pinning field. The magnetization curves and hysteresis losses of a non-oriented (NO) silicon steel sheet are accurately reconstructed by these models.

In this paper, we aim to build wireless temperature measurement induction heating system for hyperthermia using “Au-coated Ferromagnetic Implant with Low Curie Temperature (Au-FILCT)”. Using this system we clarified the distance-dependent characteristic of voltage used for detecting temperature in heating process of Au-FILCT under high-frequency magnetic field applied. The tumor temperature is measurable utilizing the property in which the magnetism of Au-FILCT changes depending on its temperature. We measured the voltage and temperature of Au-FILCT, while placed at distances of 1.0, 2.0, 3.0 and 4.0 cm from the top surface of the drive coil. We confirmed that the Au-FILCT was heated above the treatable temperature of 45℃ within 145.0 seconds up to the distance of 3.0 cm and the accuracy of voltage was improved with the S/N ratio 18.3 dB at 3.0 cm. In addition, the correlation of the voltage with either the temperature or distance was high. All the contribution ratios of their approximate expressions were above 0.97. We propose a method of estimating the temperature from the voltage measured even if the distance to the Au-FILCT is unknown, assuming the core body temperature is stable at about 37℃.

Energy efficiency for radical production in a coaxial type corona discharge reactor driven by an inductive energy storage pulsed power generator using a semiconductor opening switch with an arrester was studied. The experiment on ozone generation and NO removal were conducted to estimate the O and N radical densities in the corona reactor, respectively. The coaxial reactor consisted of a center rod wound with a spirally-twisted tungsten wire and an outer electrode. O₂ and N₂/NO mixed gases were injected to the reactor for ozone generation and NO removal, respectively. The O and N radical densities in the plasma ranged from 0.2 to 1.1×10²⁰ m^-3 and 1.8 to 8.0×10¹⁸ m^-3 with the arrester, respectively. The energy efficiency for O radical production with the arrester ranged from 84 to 88 g/kWh, approximately 1.6 times higher than that without the arrester. The energy efficiency for N radical production with the arrester is 33 g/kWh, approximately 9 times higher than that without the arrester.

Insulating performance of DC high voltage instruments are affected due to contamination of floating particles with its instruments or systems. Especially, the effect of charging floating particles are serious because insulation performance of high voltage instruments decreased. This is because neighborhood floating particle which is charged enhanced the electric field. The charging phenomenon of floating particle have numerous possible causes. For example, contact charging, ion stream which are caused by partial discharge and natural radiation. In this work, we researched the laser charging effect of a metallic particle, which are made of steel and φ = 2.0 mm in diameter, in DC high voltage quasi-uniform field gap at atmospheric pressure. As a result, the polarity and the charge amount of a metallic particle were controlled by YAG-laser. In addition, breakdown voltage and corona discharge voltage were measured and compared to simulation value in this configuration.

Thermoelectric power generation can effectively utilize waste heat. ZT representing the performance of thermoelectric materials is required to have a value of 2 or more for the applications. SnSe with a high ZT of 2.6 has an anisotropy of thermoelectric properties due to the crystal structure. Since heat exists in various places, many SnSe single crystals are considered to be necessary. Here we attempted to grow single crystals of SnSe by a temperature gradient method as a simple technique. Also we prevented evaporation of SnSe with double tubes seal. We fabricated SnSe crystals at the cooling rates of 5, 10 and 50℃/hour using MgO (100) single crystalline substrate as seed crystal. The SnSe crystal fabricated at a cooling rate of 50℃/hour was shown to be polycrystal. On the other hand, the SnSe crystal fabricated at a slower cooling rate of 10℃/hour was shown to be pseudo-single crystal with stoichiometric composition. The temperature dependence of the electric conductivity and the Seebeck coefficient of the SnSe crystals was the same tendency as that of SnSe single crystal.

For size reduction of gas insulated switchgears (GIS), application of permittivity-graded material to insulating spacer has been studied. The electric-field-enhancement close to the lamination interface of the permittivity-graded material obtained by laminating epoxy composites with different permittivities was investigated. The FEM simulation revealed that the increase of the layer number of the permittivity-graded material could reduce the field enhancement close by the lamination interface, even when considering electric field distortion near the individual high permittivity particles filled in each layer.

This paper describes an effect of transient electromagnetic fields on bioelectric-potential responses of bulbs (tulip and gladiolus). In our experiment, two kinds of transient electromagnetic fields by spark discharges of were applied to bulbs. In applying transient electromagnetic fields, the pulse widths of discharge current (800 A) were set to 3 µs and 20 µs, respectively. After field applications, we measured bioelectric-potential of target bulbs for 12 hours. As a result, we found that the energy level of measured bioelectric-potentials was greater when the pulse width was set to 3 µs.

To evaluate the long-term reliability of polymeric material used for electric power apparatus in the coastal area and to establish its insulation diagnosis technique, we evaluated recovery characteristics of hydrophobicity and electrical property of silicone rubber (SiR) by performing a salt fog aging test. As the result, the required times for recovery between the hydrophobicity and the electrical property are different. The time when the leakage current begins to be detectable might be a good index of the deterioration diagnosis.

In this study, activated carbons were made from shochu waste for electrode materials of electric double-layer capacitor (EDLC). This study data indicated that the specific capacitance of the shochu waste-derived activated carbon used in the EDLC was increased by partial temperature-elevation activation.