Self diffusion constants definition

The purpose of this introduction, other than definition of terms, has been to summarize the key aspects of Tn in a manner slightly different than that employed in ref 1. A further purpose was to update certain topics of particular importance to understanding the structural implications of Ty, as with NMR. In some instances a full section has been prepared, as with zero shear melt viscosity, %, and self diffusion constant, Dq (Section V). New smdies of early Ueberreiter papers have also been included. In other instances, specific subject areas treated briefly in ref 1 are the topic of individual papers in this Symposium. 

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