提取

The frequency band energy method based on the wavelet packets analysis is used for the feature extraction of signal.

同时，运用基于改进的小波包的频带能量法提取变频调速系统的故障特征，分析了小波包分解层次对特征量提取的影响。

In this paper, a new algorithm based on wavelet transform and Teager energy operator is presented to detect voiced regions.

常用的浊音段提取方法多采用语音信号的短时能量、短时平均过零率及线性预测编码参数等来提取浊音段。

This article studied on the extraction and enzymology character of the crude protease from the body of Holothurian .

研究了海参体壁粗蛋白酶的提取方法和酶学性质，最佳提取条件为紫外线下照射30min，硫酸铵饱和度梯度为40%￣60%。

The present invention relates to an equisetum pratense total alkaloid and its application in preparation of medicine with sedation and stabilization.

本发明为一种植物中提取的成分对中枢神经系统的抑制作用及作用机制，这种成分为从草问荆中提取的草问荆总碱，这种作用表现为镇静、安定作用。

A new technology, Supercritical Fluid CO_2 Extraction, was also supplied to study the plant. The technological parameter was optimal. Total extract of SFE-CO_2 were 4.86 times of the essential oil extracted by SDE, main active extracted constituents were 1.36% high than SDE. The chemical constituents of SFE-CO_2 were also analyzed by GC-MS. 57 constituents were identified, 29 constituents of them were first discovered. 24 constituents were discovered in two extract. Fingerprint is a good technology to elevate the quality of herb medicine. The main active fraction can be extracted by SDE and SFE, Fingerprint was studied respective, chromatographic parameter was acquired. 22 peaks were assigned common peaks in the spectrum of essential oil, 17 peaks were assigned to common peaks in the spectrum of SFE extract.

采用现代共性关键技术超临界CO_2萃取技术，通过正交试验，优选了超临界CO_2提取牛至挥发油的工艺，并与传统的水蒸气蒸馏法进行了比较研究，结果显示：前者提取有效部位的收率为后者的4.87倍，主要有效成分的转移率是后者的1.36倍；采用GC-MS分析方法和NIST质谱库检索，对SFE和SDE所提化学成分进行比较，SFE分离鉴定了57种化合物，占提取物总含量的86.96％，其中29种化合物为首次从该植物中鉴定；后者分离鉴定了69个化合物，占提取物总量的98.28％，其中27种化合物为首次从该植物中鉴定；两种方法的提取物中共有成分25种，包括主要有效成分麝香草酚、香荆芥酚、对聚伞花素等。

The hydrolysis was extracted with ethyl ether and concentrated, analyzed and determined with GC/MS.

为了研究不同的加工工艺对茶鲜叶香气和糖苷类香气前体的的影响，利用槠叶种群体的一芽二、三叶鲜叶为原料，按照传统的加工工艺分别制成红茶、绿茶，应用SDE提取、GC/MS对香气组成进行分析，同时应用溶剂提取、双相酶解和GC/MS对糖苷类香气前体物质进行系统分析。

There are two main types of Evening Primrose oil, one is extracted using chemical solvents, whilst the other is extracted by mechanically pressing the oil from the seeds.

主要有两种类型的月见草油，是使用化学溶剂提取，而另一种是提取石油机械紧迫的种子。

In this study, a gear fault diagnosis method is investigated based on wavelet analysis and modified exponential distribution technique.

齿轮故障诊断的关键是从齿轮故障振动信号中提取故障特征，信号分析和处理是特征提取最常用的方法。

The accumulation factors of heavy metal in different kinds of leafy vegetables decreased with the increase of the extractable heavy metal concentration, which can be described best by the exponential equation y=ax(superscript b.

不同品种蔬菜对各重金属的富集系数随可提取态重金属含量增加呈幂函数形式递减，且递减趋势与土壤中可提取态重金属含量范围密切相关。

In order to avoid the singularity in the integration, the integrand was expressed to be sum of complex exponential terms by using discrete complex image method. With generalized pencil of function method introduced, the number, location and intensity of images were obtained without extracting the quasi-static and surface wave terms in the integrand, which makes DCIM more efficient for multi-layered media.

为了避免积分中的奇异性，利用离散复镜像法将积分核用复镜像的指数求和式表示，引入广义函数束方法，可以在不提取积分核中表面波项的条件下，采用数值方法提取准静态项，给出复镜像点的数目、位置和强度，使得该方法在多层介质情况下对格林函数的计算更为有效。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。