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学习动机是在需要的基础上产生的 ,是能直接激起、调节、维持或停止学习活动的内部动力 ,常以愿望、兴趣、理想等形式表现 ,会影响学习的方向、进程和效果。学习动机可分为直接性动机和间接性动机。直接性动机与学习活动本身的内容及完成过程有密切的联系 ,由对学习的直接兴趣、对学习活动的直接结果的追求引起。间接性动机与社会意义相联系 ,是社会要求在学生学习上的反映。只有两种动机结合 ,才能成为推动学生努力学习的巨大动力。学习动机对学生的学习是非常重要的。它能有效地激发学生求知的需要 ,促进学生学习活动 ,同时 ,如果一个学生… 相似文献
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INTRODUCTIONRotatingmachinessuchaselectromotor,dy namotor,turbocompressor,etc .areimportantequipmentsinmanyindustryfields.Peoplehadbeenpayingconsiderableattentiontotheircon ditionmonitoringandfaultdiagnosis (Xu ,19 98) .Theoretically ,anyfluctuationofforc… 相似文献
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This paper proposes novel multi-layer neural networks based on Independent Component Analysis for feature extraction of fault
modes. By the use of ICA, invariable features embedded in multi-channel vibration measurements under different operating conditions
(rotating speed and/or load) can be captured together. Thus, stable MLP classifiers insensitive to the variation of operation
conditions are constructed. The successful results achieved by selected experiments indicate great potential of ICA in health
condition monitoring of rotating machines.
Project supported by the National Natural Science Foundation (No. 50205025) and the Natural Science Foundation of Zhejiang
Province (No. 5001004). 相似文献
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