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纤维素水解反应是中学化学实验教学中的重要内容。针对纤维素水解时间长、实验效果不佳等问题,本文采用银镜反应结果作为实验指标,利用正交试验设计法实现对纤维素水解实验方案的优化设计,探讨纤维素水解的最佳实验方法。实验结果验证了该方法的有效性。 相似文献
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Traditional methods for detecting symmetry in image suffer greatly from the contrast of im-age and noise, and they all require some preprocessing. This paper presents a new method of im-age symmetry detection. This method detects symmetry with phase information utilizing logGabor wavelets,because phase information is stable and significant, while symmetric points produce pat-terns easy to be recognised and confirmable in local phase. Phase method does not require any preprocessing. and its result is accurate or invariant to contrast, rotation and illumination conditions. This method can detect mirror symmetry, rotating symmetry and curve symmetry at one time. Results of experiment show that, compared with pivotal element algorithm based on intensity information, phase method is more accurate and robust. 相似文献
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