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The epoxidation of α-pinene and β-pinene by 50% hydrogen peroxide and a small amount of sodium tungstate, in the presence of quaternary ammonium salt A-1 as a phase transfer catalyst, is carried out.

摘 要：采用季铵盐A-1作相转移催化剂，质量分数为50%的H2O2作氧化剂，三氯甲烷作溶剂，在加入少量钨酸钠的条件下，实现了α-蒎烯和β-蒎烯的环氧化反应。

The efforts of different purification steps were checked by polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulphate.

各步分离提纯的效果用SDS-PAGE证实。过Sephadex G-75后的提纯物显示一条主区带，紧靠主区带有一条几乎可以忽略不计的次区带。

The most common method of producing biodiesel is to react animal fat or vegetable oil with methanol in the presence of sodium hydroxide (a base, known as lye or caustic soda).

生产生物柴油的最常用的方法是作出反应，动物脂肪或在氢氧化钠甲醇植物油（1基础，碱液或者烧碱已知）。

In the research of the Silver Carboxylate conductive ink, the silver citrate emulsion was synthesized through the reaction of silver nitrate with sodium citrate in the presence of Polyvinylpyrrolidone as a protected agent in water, then the silver citrate emulsion was deoxidized by aqueous ascorbic acid to get the nano-silver colloid.

在有机酸银导电油墨研究中，在高分子保护剂聚乙烯基吡咯烷酮存在的条件下，通过柠檬酸钠与硝酸银反应，合成了柠檬酸银乳液，并用抗坏血酸对柠檬酸银乳液进行还原，制得了纳米银胶导电油墨。

To investigate the applications of nano-silver colloid in conductive silver film,the nano-silver colloid was synthesized using ascorbic acid reduce silver citrate nano-emulsion in the presence of polyvinylpyrrolidone as a protected agent.

为了合成纳米银胶并考察其在制备导电银膜方面的应用性能，在聚乙烯吡咯烷酮保护下，利用抗坏血酸还原柠檬酸银纳米乳液，合成了纳米银胶，并将其用迈耶棒涂布在支持体上制备了纳米导电银膜。

It was observed that in the presence of nano-TiO2 the stability, antifouling properties and self-life of modified electrode were improved than poly/GC modified electrode.

观察含有奈米二氧化钛的存在其稳定性、染料性质和修饰电极自身对於聚合/GC修饰电极有何改进。

Any of various powdery or scaly reddish-brown or reddish-yellow hydrated ferric oxides formed on iron and iron-containing materials by low-temperature oxidation in the presence of water.

铁锈：粉末状或鳞状的红褐色或黄褐色的水气含铁化合物。由于遇水而在铁上或含铁材料上低温氧化而成

Seeing i was wearing a puzzled expression,Vera promptly explained that "brown bagging" had the meaning of providing lunch for oneself or taking one's lunch to eat in the presence of one's company.

维拉见我面带困惑，随即解释Brown bagging乃自备午餐之意，或携带午餐回公司用，因为食物多用咖啡色的纸袋装，因而得其名。

Seeing I was wearing a puzzled expression_r, Vera promptly explained that "Brown bagging" had the meaning of providing lunch for oneself or take one's lunch to eat in the presence of one's company.

薇拉见我面带困惑，随即解释Brown bagging有自备午餐之意，或携带午餐回公司用，因为食物多用咖啡色纸袋装，因而得其名，自备午餐者则为brow

Seeing I was wearing a puzzled expression, Vera promptly explained that "Brown bagging" had the meaning of providing lunch for oneself or take one's lunch to eat in the presence of one's company.

薇拉见我面带困惑，随即解释Brown bagging有自备午餐之意，或携带午餐回公司用，因为食物多用咖啡色纸袋装，因而得其名，自备午餐者则为brown baggers。

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。