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Chung, Ee-Yung,Lee, Chang-Hoon,Park, Young-Je,Choi, Moon-Sul,Lee, Ki-Young,Ryu, Dong-Ki The Malacological Society of Korea 2011 The Korean Journal of Malacology Vol.27 No.1
The gametogenic cycle and the spawning season in female and male Cyclina sinensis were investigated by quantitative statistical analysis using an image analyzer system, and the biological minimum size (the size at 50% of sexual maturity) was calculated by combination of quantitative data by size and von Bertalanffy's equation. Compared the gametogenic cycle by quantitative statistical analysis with the previous qualitative results in female and male C. sinensis, monthly changes in female and male gametogenic cycles calculated by quantitative statistical analysis showed similar patterns to the gonadal stages in female and male reproductive cycles by qualitative histological analysis. Comparisons of monthly changes in the portions (%) of each area to eight kinds of areas by quantitative statistical analysis in the gonads in female and male C. sinensis are as follows. Monthly changes in the portions (%) of the ovary areas to total tissue areas in females and also monthly changes in the portions of the testis areas to total tissue areas in males increased in March and reached the maximum in May, and then showed a rapid decrease from June to October. Monthly changes in the portions (%) of oocyte areas to ovarian tissue areas in females and also monthly changes in the portions of the areas of the spermatogenic stages to testis areas in males began to increase in March and reached the maximum in June in females and males, and then rapidly dropped from July to October in females and males when spawnig occurred. From these data, it is apparent that the number of spawning seasons in female and male C. sinensis occurred once per year, from July to October. Monthly changes in the number of the oocytes per mm2 and in the mean diameter of the oocyte in captured image which were calculated for each female slide showed a maximum in May and reached the minimum from December to February. Therefore, C. sinensis in both sexes showed a unimodal gametogenic cycle during the year. The percentage of sexual maturity of female and male clams ranging from 25.1 to 30.0 mm in length was over 50% and 100% for clams over 40.1 mm length. In this study, the biological minimum size (sexually mature shell lengths at 50% of sexual maturity) in females and males were 26.85 and 26.28 mm, respectively.
A fundamental study for the crack healing of SiC ceramics and SiCf/SiC composite ceramics
Ki Woo Nam,Chang-Kwon Moon,Im Sul Seo 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.6
After sintering SiCf/SiC composite ceramics as a material applied to the blanket structure of a fusion reactor, micro-cracks are created by conducting a Vickers test. The presence of a crack was observed using a SEM and the relation between the bending strength and the orientation of the reinforcing fibers were analyzed. There is no relation between the bending strength of SiCf/SiC composite ceramics and the size of a pre-crack until a limited crack size. The crack healing behavior was investigated on SiCf/SiC composite ceramics with a coating of SiO2 nano-colloid on the surface using various methods, such as dipping and a hydrostatic pressure. Although the coating treatment with SiO2 nano-colloid is conducted according to the hydrostatic pressure method, SiO2 oxide is only created at the base of a crack. As a result, the recovery of bending strength cannot be anticipated.