结果醛的催化不对称烷基化反应中，1-苯基丙醇的光学产率达74.1% ，化学产率达93.8% ；
RESULTS Under suitable conditions the highest optical yield was 74.1% whereas the chemical yield was 93.8% for the alkylation of aldehydes;
最近的研究表明，超声波不仅可以改善反应条件，还可以加快反应速度和提高反应产率，这已引起广大化学工作者的极大关注。
Many chemical workers were interested in the newly research approved that ultrasound could not only improve reaction conditions, but also could speed-up reaction and increase chemical yield.
减小水泥浆密度或增加水泥浆产率所用的化学添加剂或惰性材料。
A chemical additive or inert material used to decrease the density or increase the yield of a cement slurry.
煤岩学标志、有机地球化学参数和热模拟实验产烃率数据为FMT 值定量评价煤生烃排烃潜力的适用性和有效性提供了佐证。
Marks of coal petrology, parameters of organic geochemistry and yield-oil of thermal simulated experiment are provided evidence for availability of"FMT"evaluation method.
与传统的化学合成法相比，脂肪酶催化合成内酯具有方法简单、反应条件温和和产率高等特点。
Compared to conventional chemical synthesis, lipases catalyzed synthesis of lactones is simple, mild and highly productive.
超声波化学又称声化学，是利用超声波加速化学反应、提高反应产率的一门新兴的交叉学科。
Ultrasonics sonochemistry is also called sound chemistry, it is a newly cross chemistry about speed-up chemical reaction, increasing reaction yield under ultrasound.
捕收剂用量的加大，可使电化学浮选精煤的产率增加，降硫率减小。
The more collecting agent, the higher flotation concentration recovery of coal electrochemical flotation, the lower percentage of desulfurization.
研究结果表明化学结构适易的烷氧基苯甲醛氧化产率大于90 %。
The experimental results indi- cate that oxidation yields of some alkyloxybenzaldehydes are above 90 % .
产率可达90%以上，接枝效率80%以上，高沸醇木质素和丙烯酰胺的接枝效果良好，进一步证明高沸醇木质素具有较高的化学活性。
The yield and graft efficiency were respectively obtained more than 90% and 80%. The fact verified that HBS lignin has better chemical activity.
该工艺技术流程简单，生产方案灵活，化学耗氢低；加氢尾油产率高、质量好。
This technology is simple in processing scheme, flexible in production option, with low chemical hydrogen consumption and high yields of unconverted oils of superior quality.
该工艺技术流程简单，生产方案灵活，化学耗氢低；加氢尾油产率高、质量好。
This technology is simple in processing scheme, flexible in production option, with low chemical hydrogen consumption and high yields of unconverted oils of superior quality.
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