目的比较问题式学习(problem based learning,PBL)教学法与讲授式学习(lecture based learning,LBL)教学法在全科医学超声临床技能培训中的教学效果。方法将在本院进行超声临床技能培训的59名全科医学学生,随机分成2组,LBL组29名,PBL组3...目的比较问题式学习(problem based learning,PBL)教学法与讲授式学习(lecture based learning,LBL)教学法在全科医学超声临床技能培训中的教学效果。方法将在本院进行超声临床技能培训的59名全科医学学生,随机分成2组,LBL组29名,PBL组30名。比较两种教学方法的课堂测试成绩、以及教学满意度。结果PBL组的课堂测试成绩优于LBL组,两组间差异性比较有统计学意义(P<0.05)。PBL教学效果的满意度高于LBL组,但两者间差异性比较无统计学意义(P>0.05)。结论PBL教学法在全科医学临床技能培训中的教学满意度较高,PBL组的课堂测试成绩优于LBL组,运用PBL教学法可以明显提高全科医学超声技能培训的教学效果。展开更多
Laszlo and Olsson constructed Grothendieck＇s six operations for constructible complexes on Artin stacks in etale cohomology under an assumption of finite cohomological dimension, with base change established on the l...Laszlo and Olsson constructed Grothendieck＇s six operations for constructible complexes on Artin stacks in etale cohomology under an assumption of finite cohomological dimension, with base change established on the level of sheaves. We give a more direct construction of the six operations for complexes on Deligne- Mumford stacks without the finiteness assumption and establish base change theorems in derived categories. One key tool in our construction is the theory of gluing finitely many pseudofunctors developed by Zheng （2014）. As an application, we prove a Lefschetz-Verdier formula for Deligne-Mumford stacks. We include both torsion and l-adic coefficients.展开更多
文摘目的比较问题式学习(problem based learning,PBL)教学法与讲授式学习(lecture based learning,LBL)教学法在全科医学超声临床技能培训中的教学效果。方法将在本院进行超声临床技能培训的59名全科医学学生,随机分成2组,LBL组29名,PBL组30名。比较两种教学方法的课堂测试成绩、以及教学满意度。结果PBL组的课堂测试成绩优于LBL组,两组间差异性比较有统计学意义(P<0.05)。PBL教学效果的满意度高于LBL组,但两者间差异性比较无统计学意义(P>0.05)。结论PBL教学法在全科医学临床技能培训中的教学满意度较高,PBL组的课堂测试成绩优于LBL组,运用PBL教学法可以明显提高全科医学超声技能培训的教学效果。
基金supported by China’s Recruitment Program of Global Experts,National Natural Science Foundation of China(Grant No.11321101)Hua Loo-Keng Key Laboratory of Mathematics,Chinese Academy of Sciences,National Center for Mathematics and Interdisciplinary Sciences and Chinese Academy of Sciences
文摘Laszlo and Olsson constructed Grothendieck＇s six operations for constructible complexes on Artin stacks in etale cohomology under an assumption of finite cohomological dimension, with base change established on the level of sheaves. We give a more direct construction of the six operations for complexes on Deligne- Mumford stacks without the finiteness assumption and establish base change theorems in derived categories. One key tool in our construction is the theory of gluing finitely many pseudofunctors developed by Zheng （2014）. As an application, we prove a Lefschetz-Verdier formula for Deligne-Mumford stacks. We include both torsion and l-adic coefficients.
