Purpose:This study aimed to identify the potential attributes of teacher leadership among preservice teachers with higher levels of reflection,especially in the Chinese context.Design/Approach/Methods:A mixed research...Purpose:This study aimed to identify the potential attributes of teacher leadership among preservice teachers with higher levels of reflection,especially in the Chinese context.Design/Approach/Methods:A mixed research method was adopted in this study.First,a quantitative research method was conducted to examine preservice teachers'reflection depth.The top I0%of the preservice teachers with higher levels of reflection were selected as the target respondents for comparison.Second,qualitative data analysis was conducted to identify potential attributes of emergent teacher leadership in these preservice teachers.Findings:This study identified five potential attributes of emergent teacher leadership among preservice teachers who showed deeper reflection depth.Additionally,this study identified how the unique attributes fit into preservice teachers'professional development in the Chinese context.Originality/Value:This study proposes a new development model to develop preservice teachers that emphasizes the role of continuous reflections in context for professional growth.This study holds implications for understanding the potential attributes of emergent teacher leadership among Chinese preservice teachers.Additionally,this study appeals to the importance of cultivating preservice teachers to practice teacher leadership during the teacher training stage to support them to become outstanding future teachers.展开更多
We build an experiment system based on total reflection(TR) method to observe the evolution of real contact area of polymethyl methacrylate(PMMA) in the continual stick-slip movement. The bilateral friction is adopted...We build an experiment system based on total reflection(TR) method to observe the evolution of real contact area of polymethyl methacrylate(PMMA) in the continual stick-slip movement. The bilateral friction is adopted to overcome the bending moment in the lateral friction movement. Besides some classical phenomena of stick-slip movement such as periodical slow increase of frictional force in sticking phase and a sudden drop when slipping, a special phenomenon that the contact area increases with the tangential force is observed, which was called junction growth by Tabor in 1959.Image processing methods are developed to observe the variation of the junction area. The results show that the center of the strongest contact region will keep sticking under the tangential force until the whole slipping, the strongest point undergoes three stages in one cycle, which are named as sticking stage, fretting stage, and cracking stage, respectively. The combined analysis reveals a physical process of stick-slip movement: the tangential force causes the increase of the real contact area, which reduces the pressure between the contact spots and finally leads to the slipping. Once slipping occurs,the real contact area drops to the original level resulting in the pressure increase to the original level, which makes the sticking happen again.展开更多
文摘Purpose:This study aimed to identify the potential attributes of teacher leadership among preservice teachers with higher levels of reflection,especially in the Chinese context.Design/Approach/Methods:A mixed research method was adopted in this study.First,a quantitative research method was conducted to examine preservice teachers'reflection depth.The top I0%of the preservice teachers with higher levels of reflection were selected as the target respondents for comparison.Second,qualitative data analysis was conducted to identify potential attributes of emergent teacher leadership in these preservice teachers.Findings:This study identified five potential attributes of emergent teacher leadership among preservice teachers who showed deeper reflection depth.Additionally,this study identified how the unique attributes fit into preservice teachers'professional development in the Chinese context.Originality/Value:This study proposes a new development model to develop preservice teachers that emphasizes the role of continuous reflections in context for professional growth.This study holds implications for understanding the potential attributes of emergent teacher leadership among Chinese preservice teachers.Additionally,this study appeals to the importance of cultivating preservice teachers to practice teacher leadership during the teacher training stage to support them to become outstanding future teachers.
基金Project supported by the National Natural Science Foundation of China(Grant No.11872033)the Beijing Natural Science Foundation,China(Grant No.3172017)
文摘We build an experiment system based on total reflection(TR) method to observe the evolution of real contact area of polymethyl methacrylate(PMMA) in the continual stick-slip movement. The bilateral friction is adopted to overcome the bending moment in the lateral friction movement. Besides some classical phenomena of stick-slip movement such as periodical slow increase of frictional force in sticking phase and a sudden drop when slipping, a special phenomenon that the contact area increases with the tangential force is observed, which was called junction growth by Tabor in 1959.Image processing methods are developed to observe the variation of the junction area. The results show that the center of the strongest contact region will keep sticking under the tangential force until the whole slipping, the strongest point undergoes three stages in one cycle, which are named as sticking stage, fretting stage, and cracking stage, respectively. The combined analysis reveals a physical process of stick-slip movement: the tangential force causes the increase of the real contact area, which reduces the pressure between the contact spots and finally leads to the slipping. Once slipping occurs,the real contact area drops to the original level resulting in the pressure increase to the original level, which makes the sticking happen again.
