本研究旨在探讨词汇网络教学策略对学生英语词汇复习的影响。通过对实验班与对照班的英语词汇测试成绩对比分析,发现实验后实验班的词汇成绩有所提升,说明词汇网络教学策略对提高学生词汇水平具有积极作用。同时,通过调查问卷结果分析,...本研究旨在探讨词汇网络教学策略对学生英语词汇复习的影响。通过对实验班与对照班的英语词汇测试成绩对比分析,发现实验后实验班的词汇成绩有所提升,说明词汇网络教学策略对提高学生词汇水平具有积极作用。同时,通过调查问卷结果分析,发现学生在实验前词汇复习中存在一定问题,如对词形变化掌握不够深入,缺乏有效的复习策略等。而实验后,学生对词汇网络的认知和使用意愿增强,复习策略也有所改善。这表明词汇网络教学策略不仅能提高学生的词汇成绩,还能改善学生的词汇复习方式和态度。因此,将词汇网络教学策略应用于英语词汇复习中,具有推广和应用的价值。This study aims to explore the effects of the Lexical Network Construction teaching strategies on students’ English vocabulary review. Through the comparative analysis of the English vocabulary test scores of the experimental class and the control class, it was found that the vocabulary scores of the experimental class improved after the experiment, indicating that the Lexical Network Construction teaching strategy has a positive effect on improving the vocabulary level of students. Meanwhile, through the analysis of the results of the questionnaire, it was found that students had certain problems in vocabulary revision before the experiment, such as insufficient in-depth mastery of word-formation changes and lack of effective revision strategies. And after the experiment, students’ knowledge and willingness to use vocabulary networks increased and their revision strategies improved. This shows that vocabulary network teaching strategy can not only improve students’ vocabulary achievement, but also improve students’ vocabulary revision style and attitude. Therefore, applying vocabulary network teaching strategies to English vocabulary revision has the value of promotion and application.展开更多
提出一种应用于单相有源滤波器(active power filter,APF)的SiC功率器件的开关损耗模型。该模型考虑了封装和印制电路板(printed circuit board,PCB)的寄生参数与器件结电容的非线性。详细阐述四种单相APF工作状态下的建模原理,并给出...提出一种应用于单相有源滤波器(active power filter,APF)的SiC功率器件的开关损耗模型。该模型考虑了封装和印制电路板(printed circuit board,PCB)的寄生参数与器件结电容的非线性。详细阐述四种单相APF工作状态下的建模原理,并给出了各工作状态下各时间段的开关过程分析与损耗计算方程。基于影响APF谐波补偿性能的关键因素的分析,结合APF的工作特点,提出SiC器件高开关频率兼容驱动方式与封装及电路布局优化方案。搭建基于单相APF的SiC功率器件测试实验样机,在不同电压点和电流点下进行测试,并将测试结果与估算结果进行比较。比较结果高度吻合,功率损耗误差在10%以内,验证了提出的开关损耗模型的准确性和有效性。展开更多
文摘本研究旨在探讨词汇网络教学策略对学生英语词汇复习的影响。通过对实验班与对照班的英语词汇测试成绩对比分析,发现实验后实验班的词汇成绩有所提升,说明词汇网络教学策略对提高学生词汇水平具有积极作用。同时,通过调查问卷结果分析,发现学生在实验前词汇复习中存在一定问题,如对词形变化掌握不够深入,缺乏有效的复习策略等。而实验后,学生对词汇网络的认知和使用意愿增强,复习策略也有所改善。这表明词汇网络教学策略不仅能提高学生的词汇成绩,还能改善学生的词汇复习方式和态度。因此,将词汇网络教学策略应用于英语词汇复习中,具有推广和应用的价值。This study aims to explore the effects of the Lexical Network Construction teaching strategies on students’ English vocabulary review. Through the comparative analysis of the English vocabulary test scores of the experimental class and the control class, it was found that the vocabulary scores of the experimental class improved after the experiment, indicating that the Lexical Network Construction teaching strategy has a positive effect on improving the vocabulary level of students. Meanwhile, through the analysis of the results of the questionnaire, it was found that students had certain problems in vocabulary revision before the experiment, such as insufficient in-depth mastery of word-formation changes and lack of effective revision strategies. And after the experiment, students’ knowledge and willingness to use vocabulary networks increased and their revision strategies improved. This shows that vocabulary network teaching strategy can not only improve students’ vocabulary achievement, but also improve students’ vocabulary revision style and attitude. Therefore, applying vocabulary network teaching strategies to English vocabulary revision has the value of promotion and application.
文摘提出一种应用于单相有源滤波器(active power filter,APF)的SiC功率器件的开关损耗模型。该模型考虑了封装和印制电路板(printed circuit board,PCB)的寄生参数与器件结电容的非线性。详细阐述四种单相APF工作状态下的建模原理,并给出了各工作状态下各时间段的开关过程分析与损耗计算方程。基于影响APF谐波补偿性能的关键因素的分析,结合APF的工作特点,提出SiC器件高开关频率兼容驱动方式与封装及电路布局优化方案。搭建基于单相APF的SiC功率器件测试实验样机,在不同电压点和电流点下进行测试,并将测试结果与估算结果进行比较。比较结果高度吻合,功率损耗误差在10%以内,验证了提出的开关损耗模型的准确性和有效性。
