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Until now, all acoustical diffraction reconstruction algorithms are in infinite forms. All of these algorithms have disadvantages: severe limitations on scatterers or tedious calculations. In this paper, we present a new reconstruction algorithm in a finite form using the method of formal parameter, which is very simple. This new algorithm gives an exact(More)
AIM To study the chemical components from the dried roots of Zanthoxylum dimorphophyllum Hemsl. var spinifolium Rhed. et Wils. METHODS Modern chromatography was used to isolate chemical components and the compounds isolated from Zanthoxylum dimorphophyllum Hems1. var spinifolium Rhed. et Wils were identified by various spectral methods. RESULTS Five(More)
AIM To research the chemical constituents from dried roots of Uncaria yunanensis Hsia. C. C. METHODS Modern chromatography was used to isolate chemical components. Their structure were identified by spectral analysis. RESULTS Seven compounds were isolated and identified as 3 beta, 6 beta, 19 alpha-trihydroxyurs-12-en-28 oic acid (I),(More)
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