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.
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