均匀电介质内球形空腔中的电场

运用静电学基本原理,分析了一道典型静电学习题的解答错误,通过讨论给出了正确结果。     

具有Ⅳ类功能反应的离散捕食系统周期解的存在性和稳定性

文章讨论了一类具有Ⅳ功能反应的离散捕食系统,获得了该系统的持久性,且当系统为周期系统时得到了其周期解的存在性,并且在适当的条件下该周期解是稳定的。     

基于Django的数据持久化研究

使用对象关系映射技术将面向对象技术和关系数据库相结合,以解决对象和关系模型之间的＂阻抗不匹配＂问题。本文分析了对象关系映射技术,并以毕业生论文（设计）管理系统为例,给出了Django的数据持久化解决方案,降低了系统的耦合度,保证了系统的可扩展性。     

关于数学分析中Dini定理教学的思考

Dini定理是判定函数列及函数项级数一致收敛的一个重要性质,因此,分析其条件的适用范围及将此定理加以推广和应用,有助于学生更好地掌握函数列及函数项级数一致收敛的判定。     

磁场中旋转圆柱导体内电场及电荷分布

金属圆柱导体在匀强磁场中分别绕对称轴和垂直于对称轴的轴转动时,推导出电场和电荷密度的表达式,研究表明电荷密度与角速度有关与旋转半径无关,电场的大小正比于旋转半径.     

Reflection on their first five years of teaching: understanding staying and impact power

Teacher turnover in urban schools is occurring at a breakneck pace; thus, it is important for us to understand the characteristics of teachers who stay and succeed in these settings. In order to address this need, this study examines the preparation and induction experiences of teachers who completed a Transition to Teaching – a funded urban apprenticeship program. Three research questions guided the study: (1) How do participants describe the characteristics that influence their five-year retention? (2) How do participants describe their success as teachers? and (3) How do participants describe the professional support they received in their preparation program and during the subsequent four years after completing the program? Quantitative and qualitative data via interviews, focus group, and an examination of teachers’ district performance scores were utilized, as a means of understanding teachers’ staying and impact power. Staying power refers to the ability to endure or last within challenging contexts by possessing strength enough to persevere. Impact power refers to their ability to influence student learning. Four assertions describe the factors influencing developing teachers who stay and have impact as they teach in challenging urban schools, suggesting that these teachers possess a strong work ethic, seek specific resources to improve pedagogy, have the knowledge and skills necessary to differentiate instruction, and seek teacher leadership opportunities in their schools. This study suggests several implications for teacher educators, educational leaders, administrators, and researchers working with new teachers in urban schools or with populations that are predominantly children of color.     

累次极限可交换的一个充分条件

研究二重极限与累次极限,一致收敛与累次极限的关系,把一致收敛的概念推广到弱一致收敛。进而给出累次极限可交换的一个充分条件。     

均匀收敛PNLMS自适应算法性能分析与应用

按照均匀收敛的总体要求,通过分析不同权值抽头的均方偏差收敛过程,得到一种均匀收敛比例归一化最小均方算法．对PNLMS算法比例系数进行改进得到另一种均匀收敛算法．仿真结果表明：所提算法保持了PNLMS类算法初始收敛速度快的特点,在整个过程中获得了均匀的速度,稳态误差与NLMS算法基本相同．     

长余辉发光材料的机理及应用

介绍了长余辉发光材料的原理及主要材料的性能特点,例举了长余辉发光材料的应用领域,探讨了长余辉发光材料的发展方向.     

关于均匀带电球面内的场强

解释了均匀带电球面内的场强为零的问题.