Koichi Hirooka

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A number of standards have been established on the gas analysis of SF6 gas equipment. Throughout the past 15 year record of manufacturing SF6 gas equipment, gas analysis has been made by the authors on a number of apparatus in operation, as well as on simulation tests of various conditions. The results showed that gas analysis is effective in the diagnosis(More)
The factors controlling the length of the human umbilical cord are uncertain. In the generally accepted 'tension theory', the length of the umbilical cord is proposed to increase the tensile force on it in the uterus. The greatest tensile force is supposed to be fetal movement. If this is so, the length of the umbilical cord should be shorter in multiple(More)
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