Estimation of the thermal diffusivity in a large electroceramic body by an invere method

Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.We investigate the temperature dependence of the thermal diffusivity for a large ceramic body of a cylindrical shape during firing up to 900 °C. The body was made of a ceramic material used in the production of electroporcelain insulators. We describe the corresponding heat transfer by the standard heat equation and solve the inverse problem by the Levenberg-Marquardt method. The results show that the method allows one to detect the physical-chemical processes occurring in the material during firing, namely, the liberation of physically bound water in the range up to 250 °C, the phase transformation of kaolinite into metakaolinite (dehydroxyla-tion) in the range ~ 450 °C – 650 °C, and solid-state sintering starting at ~ 700 °C.cf201

Genetics THE SEX-DETECTION IN NEWBORN RABBITS BY X-CHROMATIN AND PCR-SRY

ABSTRACT The aim of the present study was gonosomal screening of newborn rabbits. The neutrophil leucocyte peripheral blood X-chromatins and SRY sequences were analysed in 16 newborn rabbits, native to two litters of female lines P91 and M91. The neutrophile X-chromatin was detected in 11 newborn rabbits, while X-chromatin was not detected in 5 young. SRY-PCR fragments (242 bp) were analysed in 5 newborn rabbits, while PCR fragments were missing in 11 young. All young were evaluated according to outer genitals at 3 weeks of age. By these 3 techniques were identically detected 5 males and 11 females. The appearance of the female X-chromatin frequency was within the range 6.66%-20%. Ranking of the neutrophile X-chromatin is exact, quick and relatively cheap detection system of the sex in newborn rabbits selected for tissue cultures. The authors emphasize the relevance of the cytological analysis (occurrence X chromatin in female neutrophils) as an additional screening for all SRY negative samples. This technology provides partly selective tool for categorization of the females and males in further reproductive process. Both sexes of newborn rabbits can be used for control of production of special enzymes under genetic control of the gonosomes