頁籤選單縮合
題名 | 缺株及補植對落花生產量及其構成性狀之影響=Effects of Missing Plants and Resowing on the Yield and its Components of Peanut |
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作者 | 侯金日; 李瑞興; | 書刊名 | 嘉義技術學院學報 |
卷期 | 57 1998.04[民87.04] |
頁次 | 頁1-12 |
分類號 | 434.256 |
關鍵詞 | 落花生; 缺株; 補植; 產量; 產量組成性狀; Peanut; Arachis hypogaea L; Missing plants; Resowing; Yield; Yield component characters; |
語文 | 中文(Chinese) |
英文摘要 | Medical ultrasounds use the classic Doppler principle to estimate the blood flow velocity parallel to the ultrasound beam axis. The knowing of Doppler angle is required to correctly calculate the flow velocity. However, the Doppler angle is hard to be measured correctly with the current manually assisted method. In this paper, we presents an automatic Doppler angle measurement method for continuous flows using the classic and the transverse Doppler principles. This method uses the energy peak frequency and maximum frequency of the Doppler shift spectrum. The Doppler angle can be measured over a wide range from 45 to 85 degrees in flow phantom system. |
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