醚

The crude PPG was purified with neutralization-absorption process and the experimental conditions of crystallization, decolor , dehydration and removement of metal irons were investigated respectively.

应用中和-吸附的工艺方法对聚醚进行精制，并且分别考察了结晶、脱色、脱水、脱金属离子等重要实验条件，讨论了使用不同的吸附剂，对聚醚精制效果产生的影响。

The result indicates that the best method for extracting β-carotene is to saponify the test specimen one hour with 4% NaOH methyl alcohol solution in 60-70'c and then to separate with 3:7 acetone-benzine component solvent as extraction solvent, MgO as the absorbent, the acetone-benzine as the eluent. Extracted solvent has been determined in the color dish condition (1cm) by ultraviolet spectrophotometer at 447 nm. The result shows that the β-carotene in carrotis 0.134 mgg^(-1), 0.0863mgg^(-1) in red pepper and 0.0426 mgg^(-1) in spinach.

结果表明，比较优先的β-胡萝卜素提取方法是：试样用4% NaOH甲醇溶液在60℃~70℃皂化1h，用3：7的丙酮－石油醚混合溶剂提取，以Mgo为吸附剂，丙酮－石油醚为洗脱剂分离，提取液用紫外分光光度计在波长447nm，1cm比色皿条件下测定，得出蔬菜中β-胡萝卜素含量：胡萝卜为0.134mgg^(-1)，红椒为0.0863mgg^(-1)，菠菜为0.426mgg^(-1)。

METHODS: We measured levels of blood hydroperoxides as an indexof oxidative injury of cellular components, as well as plasmaferric-reducing ability as an index of total antioxidant potential,during sigmoidectomy under four conditions: open sigmoidectomywith sevoflurane anesthesia, laparoscopic sigmoidectomy withsevoflurane anesthesia, open sigmoidectomy with propofol anesthesia,and laparoscopic sigmoidectomy with propofol anesthesia.

在四种不同麻醉方法下乙状结肠切除术中，测定血液中的过氧化氢水平作为细胞氧化损伤的指标，以及血浆铁还原能力作为总抗氧化潜力的指标：七氟醚麻醉开腹乙状结肠切除术，七氟醚麻醉腹腔镜下乙状结肠切除术，异丙酚麻醉开腹乙状结肠切除术，异丙酚麻醉腹腔镜下乙状结肠切除术。

STUDY ON THE APPROACH AND THE MEDCHINE FOR THE DEPROTECTION OF SILYL ETHER BY SODIUM PERIODATE Abstract Silyl ethers are the most widely used hydroxyl protecting groups in organic synthesis.

第二部分：过碘酸钠去硅醚保护基方法及机理的研究硅醚保护基种类多，稳定性较好，且反应简单，作为羟基的保护基在有机合成中得到广泛应用。

The result shows that: the extraction of petroleum ether, polysaccharide and sodium copper chlorophyllin from banana leaves perform higher spumescence ability and foam stability. The critical concentration form pastern namely CMC and the surface tension in this concentration are 1.0 g/l (34.295 mN/m), 1.0 g/l (42.398 mN/m), 3.0 g/l (40.123 mN/m) respectively, which the value is close or excess the reference samples. The emulsify capability of the extraction of petroleum ether is the best in these active ingredients, and close to the emulsify capability of Tween-80. The emulsify capability of polysaccharide and sodium copper chlorophyllin from banana leaves are follow then.

试验结果表明：香蕉叶石油醚抽出物、叶多糖和叶绿素铜钠盐具有良好的起泡性和稳泡性；其临界胶束浓度CMC值和其该浓度下的表面张力分别为：1.0g/l（34.295 mN/m），1.0g/l（42.398 mN/m），3.0g/l（40.123 mN/m），已经接近或超过参照物的表面活性；香蕉叶石油醚抽出物的乳化能力最强，乳化性能已接近乳化剂吐温-80，其次为叶多糖和叶绿素铜钠盐。

The result showed that the thermal decomposition temperature of chlorinated paraffin reached 133℃ by adding 0.3% composite stabilizer in which the weight percentages of ethylene glycol diglycidyl ether, methyl stannic, triphenyl phosphate, exoxidized soybean oil were 72%, 3%, 10%, 15%, respectively. It is 15℃ more than that of using pure ethylene glycol diglycidyl ether.

结果表明：当复合稳定剂中乙二醇二缩水甘油醚、甲基锡、亚磷酸三苯酯、环氧大豆油的质量分数分别为72%，3%，10%，15%，复合稳定剂的添加量为氯化石蜡的0.3%时，氯化石蜡的热分解温度为133℃，比单独使用乙二醇二缩水甘油醚提高了15℃，热稳定效果较好。

Ammonium tristyrylphenol polyoxyethylene ether sulfate was synthesized from tristyrylphenol polyoxyethy-lene ether and sulfamic acid using urea as catalyst.

以三苯乙烯基苯酚聚氧乙烯醚和氨基磺酸为原料，合成了三苯乙烯基苯酚聚氧乙烯醚硫酸酯铵盐。

In this paper, the emulsifier sodium polyether sulfovinate modified polysiloxane was synthesized by sulfuric acid esterification between chlorosulfonic acid and polyether modified polysiloxane, then alkali neutralization. It was a kind of nonionic and anionic composite emulsifier.

本论文以聚醚改性聚硅氧烷为原料，进行硫酸酯化反应，并进一步用碱中和，合成了聚醚改性聚硅氧烷硫酸酯钠乳化剂，该乳化剂属于非离子、阴离子复合型乳化剂。

A practical charged membrane which prepared from the blends of sulphonated polyphenylene sulfide/poly can be considered as a 3D lattices. The experimental conductivity was related with a 3D simulation and the result showed the membrane has a transition from insulator to conductor at the ratio of charged components SPPS about 0.144. Obviously, this value falls in the range of a theoretical simulation for a 3D lattices.

由於实际的荷电膜也可看作为三维格栅体系，因此，可用三维格栅体系程序对不同荷电分率膜的电导数据进行拟合，结果表明，对於实际的磺化聚苯硫醚／聚醚碸共混膜，当荷电组分SPPS的分率达到0.144时，共混膜即会从不良导体变为良导体，显然该值落在理论值0.1~0.2，因此，理论模拟结果与实际荷电膜传质的实验数据相吻合。

It indicated that the PES could be uniformly dispersed in melt ε-caprolactam with small domains depending on the strong interaction between the components, The hydrogen bonding was formed between the hydrogen atom on acid amide groups and the sulphone on PES resulting in the process of the dissolution of PES in melt ε-caprolactam being greatly accelerated.

结果表明，依靠其组分之间强烈的作用力，使PES能以较小的相畴均匀的分散在尼龙6基体中；酰胺基团上的氢原子能与聚醚砜中的砜基之间产生氢键作用，从而促进了聚醚砜在己内酰胺熔体中的溶解。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。