Yoji Miyata

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High-resolution mapping along the coast and time-series measurements of the radon-222 (Rn) concentrations in the shallow zone in a semi-enclosed sea, Obama Bay, Japan, were undertaken in 2013. The temporal and spatial variations in the Rn concentrations were analyzed in parallel with meteorological conditions, physical–biogeochemical characteristics, and(More)
Insulation failure in telecommunications cables after extended use in aerial terminal closures has been examined. Extensive cracking and sea salt deposition were observed on the polyethylene (PE) insulation of wires in a terminal closure recovered from the field after 27 years of service. The insulation failure mechanism appears to be the formation, by bulk(More)
Introduction Wave absorbers for the bands below quasi-microwave are considerably thick (6-8 mm) due to being made of a soft magnetic substance whose relative permeability decreases with frequency. The relative permittivity of them are between 10 to 30. The theoretical equation for return loss predicts that the absorber should become thinner as the total(More)
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