摘要：Percussive-rotary drilling technology was considered many years ago as one of the best approaches for hard rock drilling. It is a key for popularizing this technology on a large scale to design and make an impactor with excellent performance. This paper presents a suit of method to design the percussive parameters for the oil or gas field by introducing the working principle of back-pressurod impactor, dividing the working periods of impaetor into three phases and establishing the computer emuiational model of percussive parameters. It draws a comparison between the results of model calenlation and experiment on the basis of analyzing the experiment results of impactor. The conclude provides credible foundation for designing and further ameliorating the impactor.

摘要：通过结合'链行走'聚合和开环聚合,合成了一系列含聚酯臂的超支化聚乙烯(HBPE-PCLs).首先使用α-二亚胺钯催化剂催化乙烯与极性单体HEA进行'链行走'共聚合,经脱保护得到结构明确的末端羟基超支化聚乙烯(HBPE-OH),然后以HBPE-OH为大分子引发剂,引发己内酯(ε-CL)单体开环聚合,合成了一系列含聚酯臂超支化聚乙烯(HBPE-PCLs).通过观察该聚合在正己烷中的自组装行为,发现其可以形成典型的囊泡结构,这种油中形成的囊泡在油溶性药物的运输与释放中存在着潜在的应用.