Methods: Ethanol as solvent, using ultrasonic extraction method of total flavonoids in propolis extracted using ultraviolet-visible spectrophotometry of total flavonoids were determined.
方法：以乙醇为溶剂，采用超声提取的方法对蜂胶中的总黄酮进行提取，利用紫外-可见分光光度法对总黄酮的含量进行测定。
Abstract: in this study, the reflux extraction and ultrasonic extraction processes of total flavonoids from Podocarpus nagi leaves were optimized using orthogonal experiments.
摘要：本研究采用正交试验设计分别优选回流提取和超声波提取竹柏叶总黄酮的最佳工艺条件。
The ultrasonic echoes of welding flaws for three types of pressure vessel are analyzed for feature extraction of signal processing using higher-order spectrum method.
针对焊接缺陷超声检测中信号处理的特征提取问题，应用高阶谱方法对三类压力容器焊接缺陷的超声回波信号进行了分析。
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