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The effects of different catalysts, mole ratio of glyoxalic acid and urea on yield of allantoin are investigated.

以乙二醛、硝酸、尿素为原料，通过二步合成得到尿囊素，主要考察了缩合反应中，使用不同催化剂催化缩合尿囊素的收率对比及影响因素。

The acid value of pyrolysate oil is 0. 69-0.75 mg/g and its yield is 60%-63%.

裂解油酸值稳定在0.69~0.75 mg/g，得率稳定在60%~63%。

We have used GC to follow up the formation of epoxy acid and established the acidify condition; we have done series of parallel experiments to better the pivotal condensation reaction between acid and amine; In the cyclization step, we use cheap and available reagent-Lithium amide , rather than expensive LiHMDS, to proceed the reaction; and at last, we introduced green reagent-ozone to clear the phenyl group of nitrogen to avoid using heavy metal reagent-CAN. The total yield for this method is 29.8%.

通过GC监测，确定环氧酸的最佳酸化条件；对关键的酸和胺的缩合步骤，平行试验了多种条件；在环合一步，用价廉易得的氨基锂及催化量的HMDS代替昂贵的LiHMDS进行反应；氮上苯基的脱除采用臭氧，避免了重金属试剂-硝酸铈铵的使用，总收率为29.8％。

A poisonous herb native to northern Europe having hooded blue-purple flowers; the dried leaves and roots yield aconite .

原产于北欧的一种有毒草本植物，具有兜状蓝紫色花；干燥的叶子和块根产生强心止痛剂。

The catalyst of the present invention is especially suitable for use in the conditions of low reaction temperature, high reaction pressure and high propylene load, may result in high yield of acrylonitrile, and may be used in industrial production.

本发明催化剂特别适用于在较低反应温度、较高的反应压力和高丙烯负荷条件下使用，且可保持高的丙烯腈单收，可用于工业生产中。

Actinolite and pyroxene phenocrysts separated respectively, from chlorite-actinolite schist and altered pillow basalt in the E'rou area of the eastern part of the Shuanghu-Longmuco suture zone, yield well-defined 40Ar/39Ar plateau ages of 235.9±2.6 Ma and 232.5±2.4 Ma. These nearly identical ages are interpreted as defining the age of the tectonothermal event of subduction-related collision along the Shuanghu-Longmuco suture zone.

在藏北龙木错－双湖缝合带东段双湖鄂柔地区，获得绿泥阳起石片岩中阳起石矿物的40Ar/39Ar坪年龄为(235.9±2.6)Ma和枕状玄武岩中蚀变辉石斑晶的40Ar/39Ar坪年龄为(232.5±2.4)Ma，两个年龄具有极好的一致性，记录了中三叠世晚期－晚三叠世早期沿龙木错－双湖缝合带发生俯冲碰撞作用的构造－热事件。

In the next chapter, you'll see the code in action, learning the simple mechanisms that yield all these benefits.

在下一章，你将看到实际的代码，学习产生这些优点的简单机制。

Results show that the yield of activated carbon is about 40%.

结果表明，7种生物质的活性炭产率在40%左右。

The reaction mixture was cooled to 10 °C and excess liquid ammonia added to form the acyclic carbamate 13 in 95% yield.

在反应混合物冷却到10 ° C和过剩的液氨补充，形成环氨基甲酸酯类13 95 ％的产量。

Using immobilized yeast cells to yield adenosine tripHospHate from adenosine monopHospHate is one of the most interesting techniques in ATP industry.

利用固定化酵母催化一磷酸腺苷磷酸化生成三磷酸腺苷是最有工业前景的ATP生产方法之一。

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。