住院医师规范化培训(住培)是医学生毕业后成为合格医师的必由之路。核医学是医学影像学的重要组成部分,目前已成为住培轮转的科室之一,但其功能成像、教学方法及临床思维有其特殊性。本研究分析探讨核医学科住培的现状及面临的问题,参...住院医师规范化培训(住培)是医学生毕业后成为合格医师的必由之路。核医学是医学影像学的重要组成部分,目前已成为住培轮转的科室之一,但其功能成像、教学方法及临床思维有其特殊性。本研究分析探讨核医学科住培的现状及面临的问题,参照放射科及其他医院的成熟经验,依据核医学的实际情况,强化入科教育,提高对核医学专业的认识程度,消除住培学员对辐射的恐惧;针对不同专业、不同基础的住培学员,制定个体化的带教方案;通过一对一带教,定期理论授课,开展医学影像信息系统(Picture Archiving and Communication Systems,PACS)教学,开展病例讨论,实施个性化考核,充分调动住培学员学习的积极性,才能培养其独立思考问题、分析问题并解决问题的能力,提高核医学科住培的效率。展开更多
In order to solve the problem of the high surface longitudinal crack ratio of heavy peritectic steel slabs produced by the No. 3 continuous caster at Baosteel,the physical properties of the original mold flux and the ...In order to solve the problem of the high surface longitudinal crack ratio of heavy peritectic steel slabs produced by the No. 3 continuous caster at Baosteel,the physical properties of the original mold flux and the optimized mold flux were compared in a comprehensive way by using analytical measures, such as a slag film heat-flow simulator, a thermowire molten flux crystallization tester and an X-ray diffractometer in the laboratory. The results reveal that one of the major reasons for the cracks is the poor heat transfer ability of the original mold flux. However, the optimized mold flux with a high basicity features a high crystallizing rate,low crystallization temperature and low heat-flow density. Therefore, the optimized mold flux is more suitable for casting peritectic steel by the heavy slab continuous caster. The test results show that the slabs produced by using the optimized mold flux had no surface longitudinal crack in four test casts, while the surface longitudinal crack ratio of the slabs produced by using the original mold flux was 5%. The optimized mold flux can effectively prevent slab surface longitudinal cracks from occurring.展开更多
The No. 3 slab caster,which mainly provides slabs to the 5000 mm plate mill at Baosteel, was put into production in December,2004. The size of the biggest slab produced by this caster is 2300 mm in width and 300 mm in...The No. 3 slab caster,which mainly provides slabs to the 5000 mm plate mill at Baosteel, was put into production in December,2004. The size of the biggest slab produced by this caster is 2300 mm in width and 300 mm in thickness. The designed output of the caster is 2.3 Mt/a. Slab surface longitudinal crack defects,which were related to the heat flux of the mold, frequently occurred in the early stage of the startup of the caster. As mild cooling powder is beneficial to the uniformity of the shell of initial slabs ,the concentration of stress is reduced, and the longitudinal cracking on the surface is avoided. This study evaluates the performance of several kinds of powder, and the results show that mold powder of high basicity, high crystallization proportion and low heat flux is to the benefit of the reduction of the longitudinal cracks on the surface and the defects of slabs.展开更多
文摘住院医师规范化培训(住培)是医学生毕业后成为合格医师的必由之路。核医学是医学影像学的重要组成部分,目前已成为住培轮转的科室之一,但其功能成像、教学方法及临床思维有其特殊性。本研究分析探讨核医学科住培的现状及面临的问题,参照放射科及其他医院的成熟经验,依据核医学的实际情况,强化入科教育,提高对核医学专业的认识程度,消除住培学员对辐射的恐惧;针对不同专业、不同基础的住培学员,制定个体化的带教方案;通过一对一带教,定期理论授课,开展医学影像信息系统(Picture Archiving and Communication Systems,PACS)教学,开展病例讨论,实施个性化考核,充分调动住培学员学习的积极性,才能培养其独立思考问题、分析问题并解决问题的能力,提高核医学科住培的效率。
文摘In order to solve the problem of the high surface longitudinal crack ratio of heavy peritectic steel slabs produced by the No. 3 continuous caster at Baosteel,the physical properties of the original mold flux and the optimized mold flux were compared in a comprehensive way by using analytical measures, such as a slag film heat-flow simulator, a thermowire molten flux crystallization tester and an X-ray diffractometer in the laboratory. The results reveal that one of the major reasons for the cracks is the poor heat transfer ability of the original mold flux. However, the optimized mold flux with a high basicity features a high crystallizing rate,low crystallization temperature and low heat-flow density. Therefore, the optimized mold flux is more suitable for casting peritectic steel by the heavy slab continuous caster. The test results show that the slabs produced by using the optimized mold flux had no surface longitudinal crack in four test casts, while the surface longitudinal crack ratio of the slabs produced by using the original mold flux was 5%. The optimized mold flux can effectively prevent slab surface longitudinal cracks from occurring.
文摘The No. 3 slab caster,which mainly provides slabs to the 5000 mm plate mill at Baosteel, was put into production in December,2004. The size of the biggest slab produced by this caster is 2300 mm in width and 300 mm in thickness. The designed output of the caster is 2.3 Mt/a. Slab surface longitudinal crack defects,which were related to the heat flux of the mold, frequently occurred in the early stage of the startup of the caster. As mild cooling powder is beneficial to the uniformity of the shell of initial slabs ,the concentration of stress is reduced, and the longitudinal cracking on the surface is avoided. This study evaluates the performance of several kinds of powder, and the results show that mold powder of high basicity, high crystallization proportion and low heat flux is to the benefit of the reduction of the longitudinal cracks on the surface and the defects of slabs.
