Notice of RetractionStudent-centered college classroom teaching mode based on network teaching platform
Based on the current problems analysis of college classroom courses, the students' knowledge, cognitive characteristics and background were analyzed according to the constructivist theory of knowledge. Under the guidance of the advanced concept of education, teaching theory and learning theory, Web-based teaching curriculum platform is founded with design of learner-adapted learning resources, learning strategies and cognitive tools. The establishment of reasonable and effective teaching assessment, communication and feedback mechanisms is also discussed. The novel student-centered college classroom teaching mode using network and multimedia technology is described through a case study about the Foreign Language Teaching network platform of Hebei University and the network teaching platform of North China Electric Power University.
A new modeling method based on sample data is described in this paper,through physics and sample date analysis on displacement vs.voltage characteristics of x-y plane of cylindrical piezoelectric scanner used in scanning probe microscope(SPM).Through sample data statistical analysis,and considering the error factors such as scan speed,scan angle,nonlinearity and coupling,a model represented by a binomial plus some error expressions is constructed.A nonlinearity correction expression based on the model is deduced.With the software Matlab this nonlinearity correction is simulated.The result of simulation indicates that it can eliminate the errors effectively.The ascendency of the method is that there are no polarization mechanism analysis and fewer number of model parameters.The method is practical applied to engineering.