Scientific paper format / layout If you were to write a scientific paper which must include a section on 'Basic definitions', would you put this section after the Abstract and the Introduction, or before the Introduction?

What do you think about this layout?


Abstract
Introduction
Basic Definitions 
Some chapters on the work / Methods used
Review of the literature
Results
Conclusion
Now about "introduction and definitions".

Unless you really cannot do this, the introduction should in the ideal case be more accessible (say, understandable not only to an absolute specialist in your subfield). Even more importantly, the introduction should motivate the problem and present an informal overview.

This is introduction:


  The order of the sepulation of sepulka is a well-known and important problem in Sepulka Sciences. We suggest an ordering of sepulation that increases the performance of almost each sepulka bundle.


This is main paper text:


  Let ∆ be the main sepulation index of the current sepulka bundle, orderded lexicographically [Lem, 1957]. We denote with ∂µ the difference of sepulation gradient for...