12 Pd - 3 Effect of Apply Frequency on Performance of Flange - Type Electrostatic

Atmospheric pressure discharge plasma has been studied and applied to environmental purification in recent years. We have been trying to purify diesel exhaust gas and we have verified that the combination of discharge plasma and honeycomb catalyst is quite effective for the exhaust treatment. However, complicated setup of high voltage power supplies and electrodes is required to generate stable discharge plasma inside the narrow capillaries of the honeycomb catalyst. Therefore, discharge formation inside a ceramic honeycomb using a single high voltage power supply was carried out in this study. As a result, primary discharge was generated by using surface discharge electrodes installed at both ends of the glass capillaries and the discharge successfully expanded into the capillaries from both sides. In this study, NO oxidation using this type of discharge was also investigated. As a result, the oxidation efficiency was improved by the combination of the honeycomb discharge compared to that of surface discharge alone. Therefore, it was suggested that the discharge was formed inside the honeycomb 12aA-2 Control of Electrical Tree in Nano-Composite LDPE Added with Azobenzoic Compound Polymer nano-composite was prepared by mixed addition of azobenzoic compound and Al2O3 nano-particle into LDPE to improve the electrical treeing resistance under ac voltage application. Three kinds of azobenzoic compound were tested: azobenzen (Az), nitro-azobenzen (Ni_Az) and amino-azobenzen (Am_Az). The average diameter of the particles was in a range 22.2-47.7 nm. The maximum concentrations of the azobenzoic compound and the particle in LDPE were 2.5 wt% and 5 wt%, respectively. The test materials of the mixed addition were processed in our laboratory by the solution casting method. The experimental results showed that tree initiation voltages for the mixed addition (2wt% of Az and 3wt% of the particle) were 2 times higher than those for LDPE with single addition of Al2O3 particle. The mixed addition was also effective to control tree development. The development for the material of mixed addition for above concentrations was estimated to be more than 100 times slower than that for LDPE. In the case of the material of mixed addition, it was found that azobenzoic compounds prevent the cohesion of Al2O3 nano-particles in the LDPE, 12aA-3 Measurement of Atmospheric Ionic Current and Possible relation with Earthquake Atmospheric ionic current has been continuously measured in this study. Daily time evolution of the potential normally showed a very small value after sunset until sunrise. It then gradually increased with …