查询词典 separation

By using two-stage separations indicates that, the content of total ketones compound by one stage separation is 12.14%, far lower than 54.95% by two-stage separations, and the content of pulegone and menthone increases from 3.37% and 3.46% by one-stage separation to 19.34% and 22.95% by two-stage separations respectively. But the content of the long chain unsaturated fatty acid and its ester ingredient reduces from 41.58% and 18.88% by one stage separation method to 29.06% and 9.86% by two-stage separations method respectively, also the phenol compound by two-stage separations method can been separated completely.

对荆芥挥发油采用两级分离的研究表明：酮类化合物的总含量由二级分离的54.95%远高于一级分离的12.14%，其中胡薄荷酮和薄荷酮的含量分别由一级分离的3.37%和3.46%增加到二级分离的19.34%和22.95%，而长链不饱和脂肪酸及其酯类成分含量分别从一级分离法的41.58%和18.88%降低到二级分离法的29.06%和9.86%，且二级分离法已完全除去酚类化合物。

The literature about the synthesis of the ion exchange and chelating adsorbents used in the off-line separation and preconcentration of the noble metals and the development of the on-line microcolumn separation and preconcentration of the noble metals were reviewed. Four silica gel-based adsorbents with rhodanine, 2-mercaptopyrimidine, 2-mercaptothiazoline and isophenylthiourea as the functional groups were first synthesized and applied to the on-line separation and preconcentration of silver, gold, palladium and platinum for their FAAS determination.

本论文在回顾螯合吸附材料的合成及其在贵金属的离线和流动注射在线预浓集分离发展状况的基础上，首次合成了含罗丹宁、2-巯基嘧啶、2-巯基噻唑啉和异二苯基硫脲等四种以硅胶为载体的螯合吸附剂，并用于银、金、钯和铂的流动注射微填充柱在线预浓集分离、火焰原子吸收光谱分析。

The laboratory test on two-stage low-intensity magnetic separation and "medium- and low-intensity magnetic separation" technologies for the titanomagnetite was performed through selecting two-stage grinding-beneficiation technology based on -1.7mm coarse tailings abandoning. The results indicate that the technico-economic indexes of the two-stage beneficiation process based on "medium- and low-intensity magnetic separation" are better.

选择-1.7mm粗粒抛尾的两段磨选工艺对钛磁铁矿进行了二段弱磁和&中磁—弱磁&选别工艺的实验室试验，结果表明，&中磁—弱磁&二段选别工艺具有较好的技术经济指标。

With the higher requirement of the low energy lost of hydrocyclone, especially single-level hydrocyclone inaccessible separation standard, industrialization requirements are carried out by series-parallel connection of multilevel hydrocyclone. Thus, the utilization of uniflow hydrocyclone becomes more and more abroad when the hydrocyclone changes its role from primary ultimate separation equipment to advance separation equipment.

随着对水力旋流器低能耗提出更高的要求，特别是单靠一级水力旋流器很难达到分离标准，需要通过多级水力旋流器串并联来实现工业化要求，水力旋流器从原来的终极分离设备变为预分离设备，这种角色的转变是直流式水力旋流器的应用日渐增多的重要原因。

Results show this new-inlet hydrocyclone has original sides on liquid spin-making and stabilize its flow field. Moreover this gradual contraction inlet may translate some pressure energy of liquid into kinetic energy and increase circumrotate speed. These play active actions on improving separation efficiency. Moreover, the uniflow hydrocyclone has the traits of big capacity, low pressure drop and a little low separation efficiency in contrast to the returned flow hydrocyclone. This hydrocyclone system has the higher separation property in contrast to the single-level hydrocyclone.

实验结果表明：这种新型入口结构水力旋流器在流体的导旋方面具有独到之处，能很好的形成稳定的流场；同时这种渐缩式入口方式，可将来液的一部分压能逐渐转化为动能，提高了旋流速度，对提高分离效率起到积极作用；采用新型入口的直流式水力旋流器比返流式水力旋流器压降低，处理量大且分离效率略低；组成返流式水力旋流器串联系统相对于单级水力旋流器具有更高的分离性能。

From now on, in china, air-float separation technology and water- float separation technology mainly are applied for the separation between metal and nonmetal basing on recycling Fragmentized waste PCBs, but there exists low efficiency and second pollution for the tow recycle methods.

目前国内处理废弃电路板主要采用破碎后利用密度差的气流风选和水选进行金属与非金属的分选，存在效率低和二次污染等问题。

In the separation of saponification resultants, the sodium soap of lanolin acid was converted to the calcium soap by Ca-C, which avoided emulsification in extraction and made separation easy, the complexing of cholesterol was limited through controlling the Ca-C dosage, which made subsequence separation simple.

对皂化产物分离过程，将皂化产物中的钠皂转化为钙皂，避免了萃取分离过程中的乳化现象，使分离更易操作；在钙皂转化过程中，通过控制钙盐C的加入量控制胆甾醇的配合，简化了后续的分离工艺。

The technology of separation and purification of the interesting protein was studied, centrifuge the sample and get the clear supernatant, remove protein by 50％ ethanol, concentrate by drying with freezing way, remove salt and pigment by dialysing, separation with G-50 and CM-cellulose52 column, concentrate by PEG6000, The purified sample was a single band after separation by SDS-PAGE.

研究了目的阿片肽的分离纯化工艺。发酵混合物经过离心取上清，乙醇沉淀去蛋白，冷冻干燥浓缩，透析除盐脱色，聚乙二醇6000反渗透浓缩，G-50柱分离，CM-cellulose52阳离子交换层析，聚乙二醇6000浓缩等步骤后得到了较纯的目的产物，目的产物在SDS-PAGE上呈现单一条带。

On the basis of summarizing separation method of acetic acid-water system, we studied the azeotropic distillation process of acetic acid-water system, selecting butyl acetate, isobutyl acetate and isopropyl acetate as entrainers. The influence of packing height, ratio of water to entrainer and acetic acid initial concentration to separation effect of azeotropic distillation was studied in detail. Simulation calculations of general distillation and azeotropic distillation were carried out. The influence of reflux ratio, theoretical plate, feed position, feed temperature and feed concentration to distillation process were discussed. Preferred process operation parameter, which had guiding meaning to practical production of distillation process were obtained. Basic data for the process amplifying design of azeotropic distillation tower were provided. Invest and operation energy consumption of two distillation methods were compared. The elementary technical design of azeotropic distillation tower was carried out on the basis of result of simulation calculation. The type of major auxiliary equipments and inner parts of packed tower were selected.The research results are as follows:(1) Butyl acetate, isobutyl acetate and isopropyl acetate could be selected as entrainer, and separation effect was near.

本文在综述醋酸-水体系分离方法的基础上，以醋酸丁酯、醋酸异丁酯、醋酸异丙酯为挟带剂，对醋酸水溶液进行共沸精馏过程研究，详细研究了填料高度、水与挟带剂的配比、醋酸初始浓度等对共沸精馏分离效果的影响；对醋酸-水体系进行普通精馏和共沸精馏过程模拟计算，讨论了回流比、理论板、进料位置、进料温度和浓度对精馏过程的影响，获得了对醋酸-水体系精馏过程实际生产具有指导意义的较佳的工艺操作参数、共沸精馏塔的工艺设计放大的基础数据，并对两种精馏方法的投资、操作能耗进行了比较；同时在共沸精馏模拟计算的基础上进行了共沸精馏塔的初步工艺设计计算，并对填料塔的主要辅助设备及塔内件进行了初步选型。

Isotope separation ; stable isotope ; multi-component mixture separation ; cascade theory ; matched abundance ratio cascade

同位素分离；稳定同位素；多组分分离；级联理论；相对丰度匹配级联

Objective To study the effect of chitosan in the prevention of fibrous scar formation in the epidural space after laminectomy.

目的 观察选择性脊神经后根切除术椎板切除后硬膜外几种防瘢痕粘连物质的作用并探讨其机制。

On his way to the lift, he looked back to us or was it me his eyes pointing?

当他要进电梯时，他回头看我们（或者说是我，他的眼光？