提取

In this work, three certified milk powder materials with different PCDD/Fs levels were Soxhlet-extracted and then cleaned up using Power-Prep system automatically. PCDD/Fs and planar PCBs were determined using isotope dilution and high resolution gas chromatography-high resolution mass spectrometry.

自动样品前处理在乳品中二恶英和共平面多氯联苯同时测定中的应用张磊，李敬光，吴永宁，赵云峰(中国疾病预防控制中心营养与食品安全所，北京 100050)摘要：采用索氏提取及自动净化处理系统对乳品进行提取和净化，在高分辨气相色谱-高分辨双聚焦质谱仪上进行定性和定量检测。

How to obtain effective, reliable characteristic parameter from the limited measured data is a question of great importance in feature extraction.

特征提取是目标识别的关键，如何从有限的测量数据中获取有效、可靠的特征参数，是特征提取中重点考虑的问题。

The bactericidal characters of anise,Chinese cinnamon,lilac,dark plum,semen myristieae and wrinkled giant hyssop were compared by the filter paper method,and the MIC of their extract were tested by culture plate dilute method.

用滤纸片法比较了八角、肉桂、丁香、乌梅、肉豆蔻、霍香等中药材提取液的抑菌性能，用平板稀释法进行了各提取液的最低抑菌浓度测定等试验。

DNA quantity extracted by the two methods was similar to that by phenol/chloroform methods.

两种方法提取的DNA量与用苯酚/氯仿提取DNA的量相似。

The honey samples were dissolved in water and acetone and then extracted with hexane- chloromethane, cleaned by C18 SPE cartridge, determined by gas chromatographic electronic capture detector.

蜂蜜样品用水溶解后，经正己烷-二氯甲烷提取，提取液经C18固相萃取小柱净化，采用气相色谱仪电子捕获检测器定量测定。

Using fresh chlorophyll distilled from fresh leaves of yulan as experimental material, this research analyses the change of the absorption spectra of chlorophyl under light of different wave length, different illuminating time, different temperature by means of using the WGS-9 chroma analysing instrument.

以从新鲜玉兰叶片中提取出的新鲜叶绿素为原料，用WGS-9型色度仪分别测出叶绿素提取液在不同波长的光和不同照射时间以及不同温度下的吸收光谱，通过对吸收光谱的分析得出不同光照和温度对叶绿素的影响及对叶绿素中成分的破坏情况。

Results: It was indicated that alcohol chroma and solid-liquidratio significantly affected the extraction percentage of the soluble polysaccharides.

结果 结果表明乙醇浓度显著影响可溶性多糖的提取率。其次是料液比对提取率的影响。

According to the basic principles of information theory, computer graph processing and the chromatics, this thesis mainly researches on the theory and applications of the color images watermark using the characteristics of the human visual system.

本文首先根据信息论、计算机图形处理和色彩学中的基本原理，结合人眼的视觉系统特性，对彩色图像水印的理论与应用进行了研究，然后讨论了如何对水印图像进行反色和置乱预处理，尤其是对水印嵌入过程、水印提取过程和水印攻击方法等进行了深入探讨，并最终设计实现了1套完整的具有水印嵌入与提取功能的实验软件。

According to the basic principles of information theory, computer graph processing and the chromatics, this thesis mainly researches on the theory and applications of the color images watermark using the characteristics of the human visual system. And then it discusses the preprocessing method such as Image color inversing and image disordering, especially the method of watermark embedding, watermark extracting and watermark attacking etc. At last, an experimental system about watermark embedding and extracting are accomplished.

本文首先根据信息论、计算机图形处理和色彩学中的基本原理，结合人眼的视觉系统特性，对彩色图像水印的理论与应用进行了研究，然后讨论了如何对水印图像进行反色和置乱预处理，尤其是对水印嵌入过程、水印提取过程和水印攻击方法等进行了深入探讨，并最终设计实现了一套完整的具有水印嵌入与提取功能的实验软件。

Results The optimum condition for the extraction of P.notoginseng was to circumfuse the herb in 70% alcohol for 1.5h twice,then collect an amount corresponding to 4 times of the quantity of P.notoginseng.

目的 优选三七的最佳提取工艺方法以三七皂苷R1和人参皂苷Rg1 指标进行正交试验，采用胶束毛细管电色谱法测定含量，优化影响三七提取工艺的条件。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。