Deletion of Zhou Chaochen

Comment: Duration calculus is certainly notable (over 1600 hits in Google scholar) and Zhou is an author of four of the top five and seven of the top ten hits in Google scholar, with citation counts 850, 204, 189, 181, etc. To me that is clearly enough for #C1, and he has done enough other work in this area to distinguish himself from his most frequent co-author, M. R. Hansen. The 70th-birthday festschrift, though perhaps not enough by itself, is also evidence of notability. He's also a member in the Chinese Academy of Sciences; this is a high honor (different from his earlier employment in the academy which is just a job) and enough to pass #C3
Stance: keep
Cited policy: Wikipedia:Notability (WP:PROF||WP:PROF)