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Ship-radiated noise recognition has always been a difficulty in naval warfare. The current recognition methods are applying power spectrum density estimation to underwater signal processing technology. But due to the complexity of the circumstances and disguiser's skillful designs, it usually fails to meet the need of mine warfare. Then we need to higher(More)
Modal interval-valued data is one of the most important types of symbolic data and each unit of its matrix contains a histogram or a distribution function. In this paper, a new method through Principal Component Analysis of modal interval-valued data is discussed. This Principal Component Analysis (PCA) method aims to reduce the dimensions of a large(More)
Shoot pruning could cause short-term damages to vines. In response to damage, tyloses develop in shoot xylem vessels interfering free water and mineral transportation. In this study, the tylosis development at different nodes of the current-year and perennial shoots of sixty three-year-old grapevines (Vitis vinifera L.) after pruning was investigated. The(More)
In order to solve the problem of underwater acoustic target detection and identification in the low-frequency, long-range, advantages of the vector hydrophone characteristics which measures three dimensional acoustic particle velocity vector, as well as the acoustic pressure at one location, are used to improved the acoustic pressure adaptive line spectrum(More)
Analysis the change rules and distribution of microclimate that in greenhouse such as temperature, humidity and earth temperature under different weather types in winter and spring, using the observed data in the cucumber greenhouse which seated in Shandong provincial Shouguang from 2007 to 2010. Using statistical method to choose the factors for forecast(More)
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