The principles and methods of regional land consolidation in Yunnan Province are expounded. On the basis of differences in topography, climate, soil, hydrology and other natural conditions and the characteristics of spatial layout of land use, agricultural zoning, cropping system and land...

For critical Markov branching processes {Zt} with finite variance and with time to extinction T, we obtain the asymptotic behavior of the two processes {ZuT/T,0<=u<1} and {ZT-u,u>0} as Z0=x--[infinity]. These processes were called by Jagers and co-workers the "path to extinction" and the "verge of extinction"...</=u<1}>