Hitoshi Kishi

Diagnostic technology and an expert system for photovoltaic systems using the learning method

Abstract Diagnostic technology for photovoltaic (PV) systems was developed, using the learning method to take each site’s conditions into account. This technology employs diagnostic criteria databases to analyze data acquired from the PV systems. These criteria are updated monthly for each site using analyzed data. To check the shadows on the PV modules and pyranometer, the sophisticated verification method was also applied to this technology. After the diagnosis, a basket method provides maintenance advice for the PV systems. Based on the results of precise diagnoses, this expert system offers quick and proper maintenance advice within a few minutes. This technology is highly useful, because it greatly simplifies the servicing and maintenance of PV systems.

Polarized absorption edge and exciton-photon interaction in phenanthrene

Abstract The width at the half-maximum and the steep exponential absorption edge of the first exciton band of phenanthrene provide experimental evidences of a strong exciton-phonon interaction in phenanthrene. Shoulder bands which locate at the exciton absorption edge are interpreted as due to the existence of lattice defects.