It can be found that there existed three types of acid sites.
studies revealed three does exist two types of reactions during curing of nylon with DGEBA.
There exist two types of multiuser coordination: spectrum level coordination[4 12] and signal level coordination[13 16].
Typically there exist two types of structures on the stoichiometric mixture-fraction isosurface: flame patches and extinction holes.
There exist two types of cooperative communication pattern: amplify-and-forward (AF) and decode-and-forward (DF) [2].
There exist two types of feature-based methods in the literature: filter-based and BA-based methods.
It is found that there exist two types of limit cycle behaviors rather than only one type in a boost converter.
It is shown that, in pure materials and alloys, there exist two types of solutions with two convex and with two concave parabolas, respectively.
There exist two types of MFD: one has at most a linear convergence rate and the other has a superlinear convergence rate.
In the framework of 1, there co-exist two types of 1D channels with different pore size (15 Å and 4.5 Å).
