Selecting Key Village by Quantitative and Qualitative Methods

The scientific and rational choice of key village is key to the new rural construction, mutual promotion and co-ordination between the urban and the rural in the transition period. The artificial extent of existing qualitative methods is great. Based on the space interaction principle, by introduction of quantitative methods and combination of quantitative method and qualitative method, four types of key villages are selected: the developing type, the connecting type, the trending type and the new constructing type. From the editors′ practice of new rural planning and construction in Xiaogan, they are made four typical illustrations and statistical analyses for 98 administrative villages.

ON BIFURCATIONS OF SEPARATRIX CONTOURS WITH TWO SADDLES

Bifurcations in two-parameter families containing a dynamical system having a heteroclinic orbit connecting type-a saddle equilibrium points are investigated. The existence of a countable set of bifurcation curves corresponding to saddle connections is discussed.