摘要：“三教改革”是提高高职院校教育教学质量的重要突破口,在此背景下设计构建翻转教学实践将有助于全面提高学习者的职业知识、职业技能、职业素养和职业道德,实现人才培养目标。本次翻转教学实践基于学银在线平台,以企业真实测试案例为依托,通过对“软件测试”课程实施重构课程教学内容、翻转教学、改革考核评价体系等创新举措,大大提高了教学过程中学生的自主学习能力,提高了该课程的实际教学成效,具有较强的示范推广效应。

摘要：Carbon-fiber reinforced polymer composites have been widely used to achieve the light-weighted design and high performance due to superior performance. Internal defects in the composite materials are the main factors that determine their performance,which makes reliable and effective detection methods of internal defects essential. Nondestructive testing(NDT)methods are the most widely-used way due to their tremendous advantages. Though the theoretical background is found,experimental results could be quite complicated and confusing,especially for composite materials with complex defects characteristics. In this paper,experimental study on internal defects in composite materials based on the time of flight(ToF)are investigated. The Gaussian echo model and the parameter estimation methods are established to build a theoretical model for measurements. Then,the distance amplitude correction(DAC)method is proposed to effectively improve the signal-to-noise ratio(SNR)and to reduce distortion of the signal during measurements. Finally,the ToF is adopted to determine depth of internal defects. Experiment study is conducted to investigate the porosity defects and the anti-impact performance of composite materials,as well as defects in objects with various thicknesses. Experimental results show that the proposed method is quite helpful for obtaining the intuition and deep understanding of internal defects,thus contributing to the determination of product performance and its improvement.