Tokihiko Shimizu

Second harmonic generation in the binary system of π-conjugated compounds

A large second harmonic generation (SHG) intensity, which was 60 times as large as that of urea was observed in a p‐nitroaniline(PNA)/N‐(p‐nitrophenyl)ethylenediamine (NPEN) system. This SHG intensity was related to the cooling rate for solidification. The optimum cooling rate for SHG intensity was in the range of 2–10 °C/s. X‐ray and thermal analysis done for this new system show that the hydrogen bond and the unique nonplanar structure of NPEN play an important role for SHG and its stability.

Characteristics of Film and Oil for All-Polypropylene-Film Power Capacitors

This report describes about superior insulating oil for the all- polypropylene-film capacitor developed by the authors and being used commercially. The accumulated usage of this capacitor is more than 2,000,000 MVAR-hours.

Second harmonic generation in binary systems of pi-conjugated compounds

A large Second Harmonic Generation (SHG) intensity which was 60 times as large as that of urea was observed in p-nitroaniline (PNA) I N-(p--nitrophenyl)ethylenediamine (NPEN) system. Results of X-ray and Scanning Electron Microscopy (SEM) analysis showed the new crystal structure. And this SHG intensity was related to cooling rate for solidification. The optimum cooling rate was in the range of 2°C/sec to 10°C/sec. Moreover, results of X-ray analysis and SHG measurements of similar binary systems showed that hydrogen bond and unique non- planar structure of NPEN played an important role for SHG and its stability.

Development of oil-impregnated, all-polypropylene film power capacitor

A newly developed all-polypropylene-film power capacitor is described here. The size of the capacitor is about half that of the conventional types and its dielectric loss is less than one-seventh. We succeeded in this development by studying insulating fluids, films and several factors in the production of capacitors to yield good electrical insulation which is free from voids that occur due to swelling of the film and to imperfect impregnation of the all-film construction.