提取

Some further approximations lead to a simple formula that expresses the barrier for nonidentity and identity hydrogen abstraction reactions as a function of the bond strengths of reactants and products.

第八章利用从头算价键计算方法结合价态相关图模型研究了卤族非等同氢提取反应，并对此类非等同氢提取反应做了归纳，推导出描述此类化学反应的能垒的普适半经验公式。

ResultsThe remarkable factors to affect the extraction of total phenolic acids in Nymphaea candida Presl.

结果乙醇浓度、料液比、超声提取时间对总酚酸的提取率有显著影响。

Combined with purifying using Spe-ed solid phase extraction Cartridges Octadecyl C18/18% and determining by reversed-phase high performance liquid chromatography, extraction effects by four kinds of extraction methods were studied.

结合固相萃取柱净化－HPLC测定技术比较了4种提取方法对土壤样品中吡虫啉的提取效果。

Based on single factor experiment, the extraction conditions were optimized by orthogonally rotational combination design.

从4种常用试剂中选出乙醇作为提取剂，并在单因素试验的基础上，通过二次回归旋转组合设计试验，优化白藜芦醇提取的工艺参数。

Ethanol was chosen as the extract solvent from four kinds of solvents. Based on single factor experiment, the extraction conditions were optimized by orthogonally rotational combination design.

从4种常用试剂中选出乙醇作为提取剂，并在单因素试验的基础上，通过二次回旋转组合设计试验，优化白藜芦醇提取的工艺参数。

By means of orthogonally rotational combination design,a four-factor(temperature,time,ratio of solvent to dry flower ,ethanol concentration) substrate cultivation experiment was conducted by using of Hibiscus sabdariffa L.

运用四因素二次回归正交旋转组合设计试验方案，研究了温度、时间、液料比、乙醇浓度对玫瑰茄干花萼花青素提取率的影响，确定了花青素的较优提取范围。

On the basis of it, a new way of getting the characteristics of oscillographic signal was put forward. Different characteristics we've got can provide reliable data for the setting up of calibration model.

在此基础上，提出了示波信号特征提取的概念，根据问题的需要可以提取不同的示波特征值，从而为校正模型的建立提供可靠的数据。

The basic principle is that basic geometry shape of openings in the photo is revised; the image can't be distortion by use of projection reconstruction; the corrected image is exerted by open operation and close operation of gray-image; the shape of openings is gained lastly. The perimeter borderline of openings shape is extracted. The quantity of overbreak as well as underbreak is gained by comparing to extracted perimeter and designed perimeter. The same method is applied to other opening sections. Evaluation of overbreak as well as underbreak in the openings can be easily solved in the way of quantitative.

其基本原理是：对野外摄取的洞室的基本剖面形状进行几何校正，然后应用图像学中的投影重建方法使图像不失真，对修正后的图像实行灰度图像的开操作和闭操作运算，得到洞室的基本形状，然后用图像学中的边界提取技术提取洞室的周边界，与洞室的设计形状对比分析，得到洞室在该断面上的超欠挖方量，然后对其它断面采用同样的技术就可评价某一段或整个洞室的超欠挖数量，从定量的角度解决了工程中的超欠挖评价问题。

ConclusionThis process is the best and it can be used for extraction of Panax japonicus protein.

结果氢氧化钠浓度为0.15 mol/L，用量为样品体积的20倍，提取时间1.5 h，提取 3 次为最佳工艺。

The samples of free amino acids were prepared from bee-collected pollens of codo-nopsis pilosula, brassica campestris, typha angustifilia and papaver, through extraction with ethanol-water solution and further purified by ion-exchange chromatographic columns.

本文以党参、油菜、水烛及罂粟等4种植物的蜂集花粉进行醇—水提取，经离子交换柱后得到游离氨基酸样品，提取后的花粉残渣以6ml/l盐酸封管水解制得结合氨基酸样品。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失