Sliding mode control for active magnetic bearing system with flexible rotor

This paper presents the analysis and control of active magnetic bearing (AMB) systems with a flexible rotor. A sliding mode controller design scheme is proposed to compensate for the nonlinear effects of the AMB system. A nonlinear model of the AMB system with an electromagnetic actuator and a flexible rotor is proposed to facilitate the present system analysis and controller design. This nonlinear model takes into account the dynamics of the flexible rotor, the characteristics of the nonlinear electromagnetic suspended system, and the contact force between the auxiliary bearing and the shaft. This study also considers the auto-centering control of the AMB system when subjected to disturbances and variations in the system parameters. The numerical results show that the system exhibits a periodic motion and demonstrates high accuracy and robustness when operating under sliding mode control.     

物理实验课中如何加强学生的实验操作能力

新课改中加强了对物理实验操作能力的要求,文章就规范演示实验、重视基本操作和基本技能训练、扎扎实实上好实验课、积极开展课外科技活动并开放实验室,弥补实验课的不足几方面与大家进行探讨。     

基于教师职业能力的《中学物理教学法》课程教学探索

《中学物理教学法》课程作为高等师范院校学生的一门重要课程,担负着向学生传授教学理论、训练教学技能的重要任务.如何把该课程的教学与中学物理教师职业能力的培养结合起来,是摆在高等师范教育工作者面前的重要课题.针对中学物理教学实际,通过对中学物理教师的职业能力进行结构分析,提出了课程的＂知能结构＂教学方法.     

大学物理教学培养学生工程意识的思考

随着科技的发展和社会的进步,对大学物理的教学提出了更高要求。针对目前大学物理教学的现状,从教师的认识、教学方式、学生的学习方法等方面进行分析,提出在教学中应通过对教学内容和教学方法的改革,培养学生的工程意识。     

FísicActiva: applying active learning strategies to a large engineering lecture

This paper presents and analyses the results obtained by applying Active Learning techniques in overcrowded Physics lectures at the University of the Republic, Uruguay. The course referred to is Physics 1, the first Physics course that all students of the Faculty of Engineering take in their first semester for all the Engineering-related careers. Qualitative and quantitative data corresponding to three semesters are shown and discussed, indicating that the students that attended these lectures outperformed the students that followed the course in the traditional way: the pass rates increased, whereas the failure rates decreased. The students highly valued this methodology, in particular, the interactive and relaxed dynamics, highlighting the concern of professors to answer questions by means of new questions so as to promote reasoning. The results obtained point to a work path that deserves to be deepened and extended to other Engineering courses.     

王易修辞学的科学性诉求

王易是中国现代修辞学的奠基者 ,其修辞学著作的出版”标志着修辞学独立而完整的体系的正式出现”。王氏修辞研究的最鲜明特色就是注重科学性。王著运用科学的方法 ,将所研究的对象划分出层次 ,揭示了修辞活动的实践性特点 ,揭示了修辞对语言交际的扩张功能 ,揭示了修辞活动中的辩证规律。     

Students’ ideas about prismatic images: teaching experiments for an image-based approach

ABSTRACT

Prismatic refraction is a classic topic in science education. To investigate how undergraduate students think about prismatic dispersion, and to see how they change their thinking when observing dispersed images, five teaching experiments were done and analysed according to the Model of Educational Reconstruction. For projection through a prism, the students used a ‘split image projection’ conceptualisation. For the view through a prism, this conceptualisation was not fruitful. Based on the observed images, six of seven students changed to a ‘diverted image projection’ conceptualisation. From a comparison between students’ and scientists’ ideas, teaching implications are derived for an image-based approach.     

浅析《大学物理实验》课程的教学改革与实践

针对大学物理实验课程的特点,结合合肥师范学院物理与电子工程系多年的办学经验和教学科研条件,本文系统研究了大学物理实验课程教学手段、教学内容、教学方法等方面的改革,总结了技术应用型人才培养模式的创新经验与特色,旨在深化教学改革,努力培养有特色的高素质应用型人才。改革后的实践表明,大学物理实验教学质量有了明显的提高,学生的创造性思维能力和实际动手能力得到了加强,学生的综合素质也有了很大的提高。     

应用型高校大学物理教学改革过程中开放性调研项目库建设

在建设应用型高校背景下,为了培养优秀的应用型人才,大学物理课程教学在不断尝试改革。本文针对大学物理课程现状和存在的问题,探索出了一条“开放性调研项目”驱动式学习。以学生调研开放性工程实例项目为切入点,在加强物理知识与专业知识融合,在教学思想、教学方法革新、完善考核评价体系方面进行了探索。阐述了调研项目的具体实施过程,存在的问题及解决办法,并在工程实例调研的过程中不断加强开放性调研项目库的建设,丰富学生的调研主题。与此同时,培养学生的调研能力、自主学习能力、团队合作精神,以及发现、分析和解决问题的能力。