Abstract. Chemical castration by a single intratesticular injection of lactic acid, which is used for cattle, was studied in rats and dogs. The injection caused necrosis of the testicular tissue in both species. Lesions in the testes were observed as early as 24 h after the injection. Plasma testosterone levels declined rapidly after treatment and remained low thereafter. The results showed that a long-lasting and probably irreversible suppression of spermatogenesis can be brought about easily and immediately by an injection of lactic acid into the testes, and that the procedure could be used for the castration of dogs.
The number of aged power equipment increases and it is important to clarify the characteristics of deteriorated insulating oil. This paper describes the basic study on transmittance spectra of oxidized insulating oils by terahertz spectroscopy. First, the mineral and mixture insulating oils heated in oxygen were measured and observed spectra change. Second, the oxidation process of insulating oil was modeled by using various compositions of dodecane and 2-octanol. The absorption related to hydroxyl groups (-OH) was significantly observed between 6 and 7 THz. And hydrogen bonds were observed from vibration change of OH. The absorption band was also observed in accelerated aging insulating oils used in power equipments as insulating oil.
The number of aged power equipment increases and it is important to clarify the characteristics of deteriorated insulating oil.This paper describes the basic study on molecular behavior in oxidation process of insulating oil by terahertz spectroscopy. The oxidation process of insulating oil was modeled by using various compositions of dodecane and 2-octanol. From the terahertz measurements, the absorption related to hydroxyl groups (-OH) was significantly observed between 6 and 7 THz. The absorption band was also observed in accelerated aging alkylbenzene used in power equipments as insulating oil, and sensitive to hydrogen bonds.
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