Model of Precipitation Kinetics Induced by Strain for Microalloyed Steels

In microalloyed steels, static recrystallisation is temporarily inhibited by precipitation which is occurring at the same time. A high number of microalloyed steels containing various combinations of carbon, nitrogen and precipitate forming elements like V, Nb and Ti were recrystallised at different temperatures and strain rates. From these results recrystallisation‐precipitation–time‐temperature (RPTT) diagrams were established. The influence of grain size and strain rate on the RPTT diagrams was studied. The precipitation kinetics were mathematically described for isothermal conditions and converted to cooling conditions, which enables an application to hot rolling. Under cooling conditions, completion of recrystallisation is prevented, especially for Nb alloyed steels.     

棉/Sorona混纺织物一浴一步法染色

通过分析棉/Sorona混纺织物一浴一步法染色中各因素对织物得色及色差的影响,优化了染色工艺,即pH值7.5,分散匀染剂1.5 g/L,元明粉50 g/L,染色温度110℃,保温时间50 min,浴比1∶15。结果表明,该染色方法可获得色光稳定、同色性好、各项色牢度高的产品,且工艺简捷、时间短,生产成本低。     

涤/Sorona纤维交织物分散染料一浴染色

采用分散染料对涤/Sorona纤维交织物进行一浴染色,分析染色中各工艺因素对涤/Sorona纤维交织物得色的影响,确定了涤/Sorona纤维交织物的优化染色工艺:染料用量≥2%(omf),pH值为5.5,染色温度110℃,染色时间50 min,载体用量1.5 g/L。染色织物具有色光稳定、同色性好和各项色牢度高等优点。     

Testosterone production and spermatogenic damage induced by organophosphorate pesticides.

Parathion is an organophosphorate pesticide amply used in agriculture. Many alterations induced by organophosphorate pesticides have been described, such as: cytogenetic alterations in germinal cells, oligozoospermia and teratozoospermia in the mouse. The effect of Parathion, both pure (PP) and commercial (PC), on mouse interstitial cell testosterone production was evaluated in vivo and in vitro. Male mice were intraperitoneally injected with a single dose of 1/3 LD50 of Parathion, both PP and PC. The animals were sacrificed at 1, 8 and 40 days post injection to evaluate the impact of disrupting testosterone production on spermatogonia, spermatocytes and elongated spermatids. The plasma testosterone was assayed by standard radioimmunoanalysis. The same method was used to assay testosterone in the culture medium of interstitial cells obtained from the control and Parathion treated animals at the same time intervals. Sperm count, sperm teratozoospermia and tubular blockage were analyzed for an appraisal of spermatogenesis. Increase in the teratozoospermia and tubular blockage was detected in the PP and PC group at 8 and 40 days post injection. Plasma testosterone levels drop significantly at 8 days and recovered slowly at 40 days only in PP animals as detected in vivo, implying interference of testicular steroidogenesis due to the toxicant. Recuperation of normality occurs at long time intervals. In conclusion, Parathion disturbs the synthesis of testosterone in mice affecting qualitatively the spermatogenesis