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当前进行的新课程改革工作为基层学校教育改革提出了新的更高的要求和期望,为学生创新精神与实践能力的培养引导了正确的方向。新一轮基础教育课程改革的实质是基础教育的全面创新,其最为深刻的意义在于促使我们去重新认识和重新发现,并逐步改变我们的课程观、教学观、学习观、评价观、发展观。 相似文献
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当21世纪的中国教育问题面临诸多挑战与质疑的时候,当应试教育及孩子成长成为新的焦点话题的时候,如何走出教育教学的创新之路,自然成了当务之急。作为一校之长,可能有两种截然不同的选择:一种是游弋于平静的湖面,按部就班,怡然自得;一种是搏击于急流险滩,虽风高浪急,险象环生,却能勇立潮头,一路高歌猛进。杨振永校长就是这样一位把"创新"二字融进了思想和血液中的改革的实践者。 相似文献
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当21世纪的中国教育问题面临诸多挑战与质疑的时候，当应试教育及孩子成长成为新的焦点话题的时候，如何走出教育教学的创新之路，自然成了当务之急。作为一校之长，可能有两种截然不同的选择：一种是游弋于平静的湖面，按部就班，怡然自得；一种是搏击于急流险滩，虽风高浪急，险象环生，却能勇立潮头，一路高歌猛进。 相似文献
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Broadband ultrasound signals will produce distortion in viscoacoustic medium, which may influence the accuracy of time-of-flight (TOF) measurement. Under the condition of single-frequency acoustic source, the wave propagation process in viscoacoustic medium was analyzed and an approximate solution of the wave propagation was given. Instances of broadband ultrasound were analyzed and simulated based on the single-frequency results. A single-frequency matching pursuits (SFMP) algorithm was then introduced to solve the waveform distortion problem. Time-frequency decomposition was applied to extracting the single-frequency compositions from broadband ultrasound signals, and then these compositions were sent to the matching pursuits (MP) algorithm for calculating the TOF parameters. Compared with the broadband signals, the shapes of extracted single-frequency signals change more slightly as distance and attenuation coefficient increase. The residuals of SFMP were far less than those of MP algorithm. Experimental results show that the SFMP algorithm is able to eliminate waveform distortion of broadband ultrasound in viscoacoustic medium, which helps improve the accuracy of TOF measurement. 相似文献
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