Three strategies (additive, chiral auxiliary or chiral reagent) were developed to improve the diastereoselectivity or enantioselectivity of the ylide cyclopropanation reactions.
The methods of chrome tannage technology and the application of studing on auxiliary agent were summarized, there were 60 pieces of refe rence documents.
The semiactive variable stiffness and damping control device outperforms the semiactive variable stiffness control as the result of the presence of auxiliary damping in this device.
A process for decolourization of anionic dye containing wastewater by using waste plastics in the presence of cationic auxiliary and sodium dodecylbenzene sulfonate has been studied.
This paper introduces the method of simple conversion measuring and calculation for gear rack thickness with depthometer as prime measuring tool and Measuring Pin,measuring ball as auxiliary tool.
Screw ash remover is main auxiliary equipment in ash handling system of coal combustion boiler in power plant.It can discharge coal ash into the ashpit continuously and evenly.
Until was ratified by JiangSu province's control center, project company may not retreat from and may not invest to auxiliary equipment and automechanism which will influence power of generator group.