查询词典 acetic ether

Our results showed that the mortality from petroleum ether extract of Inula britanica; Ricinus communis methanol ether extract; Photinia serrulate petroleum ether extract after treatment, which showed significantly higher acaricidal activities than the other ones in the concentration of 2 mg/ml.

结果表明：当提取物浓度达到2mg/ml时，旋覆花石油醚提取物，蓖麻子甲醇提取物，石楠叶石油醚提取物的杀螨活性较高。

The exact of petroleum ether was the acaricidal active site of Eungenia caryophyllata. 3.Isolation, purification and identification of compounds with acaricidal activity in Eugenia Caryphyllata: The exact of petroleum ether was separated into 6 parts by silica gel column chromatography with gradually increasing polarity of petroleum ether: ethyl acetate. The part C was demonstrated to be the most effective part by acaricidal activity test in vitro,and the time for it to kill all experimental mites was about 20 min.

丁香杀螨活性成分的追踪分离、纯化与结构鉴定：采用硅胶柱层析法，以石油醚：乙酸乙酯溶剂系统梯度洗脱，对丁香石油醚提取物进行分离，得到A~F 等6 段混合物，离体杀螨试验发现，C 段混合物具有突出的杀螨活性，50%浓度平均15min可杀死全部供试螨虫。

The azacrown ether complexes are formed by coordination of azacrown ether and metal ion, the azacrown ether is 1,12-diaza-3,4,9,10-dibenzo-5,8-diazacyclopentadecane-N,N'-diacetic acid, the metal ion can be any one of Cu2 , Ni2 , Co2 or Zn2 and so on.

所述氮杂冠醚配合物为氮杂冠醚与金属离子配位而成，氮杂冠醚为1，12-二氮杂-3，4，9，10-二苯并-5，8-二氮杂环十五烷-N，N'-二乙酸，所述金属离子可以为Cu 2 、Ni 2 、Co 2 或Zn 2 等中任一种。

But, at present, the production of a soil displacement agent from heavy alkylbenzene sulfonate and petroleum sulfonate as oil displacement agent, there were still some problems as the instable quality, produce scale. It is necessary to develop a feasible production process of arylalkyl sulfonate, alkylated diphenyl ether sulfonate and fatty alcohol ether sulfonate as they can be used as oil displacement assistant in some special oil reservoir. In which Because their abundant raw material, big changeability of structure, high electrolyte tolerance, especial strong calcium tolerance, fatty alcohol ether sulfonate has huge industrialized value.

指出重烷基苯磺酸盐和石油磺酸盐作为三次采油的主表面活性剂，目前在工业化生产中仍存在一些问题，产品质量不太稳定，需进一步改进生产工艺技术，提高产品质量，扩大生产规模；芳基烷基磺酸盐和烷基二苯醚磺酸盐可作为助表面活性剂用于特殊的油藏条件，有必要尽快开发可行的工业化生产工艺；脂肪醇醚磺酸盐类表面活性剂的原料来源丰富，分子结构可变性强，耐电解质能力强，尤其是耐钙能力强，应用领域广，极具工业化价值。

The liberated freebase methamphetamine which seperates is solvent extrated with two, 75-100 ml ether portions and the ether/amine solution is first washed with 50 mls of distilled water and the ether/amine solution dried with anhydrous sodium carbonate.

The yield is 80 - 88%解放freebase分隔甲基安非溶剂extrated是两个， 75-100毫升醚部分和乙醚/胺的解决办法是第一次洗了50英里的蒸馏水和乙醚/胺溶液干燥无水碳酸钠。

With a twin-screw extruder to prepare polypropylene / 8 ether bromide pellet, and injection molding into sheet samples, quantitative analysis of different PP / 8 the sample surface, eight bromine bromine ether ether precipitation changes with time, Using X-ray photoelectron spectroscopy on the sample surface concentrations of bromine atoms ...

用双螺杆挤出机制备了聚丙烯/八溴醚粒料，并注塑成片状样品，定量测定了不同PP/八溴醚样品表面上八溴醚析出量随时间的变化，用X-射线电子能谱对样品表面溴的原子浓度。。。

This step is irreversible.(3) Phenyl isopropyl ether is very difficult to oxidize in dark, exhibiting different behavior from isopropyl ether and benzyl isopropyl ether.

3发现苯基异丙醚难以进行暗氧化，与异丙醚和苄基异丙醚醚表现出不同的暗氧化行为。

Whole series of organic compounds, among them acetaldehyde, acetic acid, and acetic

对于整个系列的有机化合物，包括乙醛、乙酸

CHEMICAL ANALYSIS OF ACETIC ACID AND ACETIC ANHYDRIDE.

NF T20-625-1965 醋酸和醋酸酐的化学分析。

This paper summarized preparation technology and the production application at home and abroad for acetic anhydride ,and suggestions of production and development for acetic anhydride in our country was put forward.

综述了醋酐的生产技术及国内外的生产应用状况，并对国内外醋酐的生产发展提出建议。

This paper designs the communication system of radio telescope FAST.

针对500m口径球面射电望远镜FAST分布式控制系统的特点完成了其通信系统的设计。

Political sheep's step-by-step a large number of fossils unearthed in the county soil Ma Ali after rural village in the middle of sallow pelitic siltstone.

步氏和政羊化石大量出土于广河县阿力麻土乡后山村，产于灰黄色泥质粉砂岩中。