الفهرس 
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Abstract
This thesis consists of five chapter as follows:
Chapter (J):
This chapter is devoted to introduce the introduction which
shows the various types of grinding processes and importance of these
processes. Also, the main factors affecting these proc~sses, advantages
and the disadvantages of every type will be introduced in this chapter.
Chapter (2):
This chapter contains a review of the grinding theories and
pervious mathematical models that manipulate grinding process. Then
the Axial Dispersion Model was recommended to be used in this work.
Chapter (3):
This chapter is devoted to mathematical analysis and applied by
the computer program, That describes the transporting of material
•••
through the mill. This analysis is based on Crank - Necolson technique
and the program is written in Fortran language.
Chapter (4):
This chapter contains the munerical results and tracer
distribution curves which show the relationships between the tracer
concentration with respect to the position on the mill. Also, this chapter