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In this article, the characteristics, theories and classification of the threshold de-noising method are introduced in detail. According to the study, when wavelet threshold de-noising method is compared with the wavelet packet threshold de-noising method, the first method is suitable for dealing with the low frequency information, but the second method is available to deal with the information with...
According to similarity theory, with gypsum, cement, blanc fixe and water as similar material, a study on the relationship of physical and mechanic property and match ratio by orthogonal test. Effect disciplines of elastic modulus and ultimate compressive strength imposed by Content of various materials are worked out. Similar material of this experiment satisfies the requirements of selecting materials...
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