Pr Bornia Tighiouart, Badji Mokhtar university, Annaba , Algeria , Email : b.tighiouart@gmail.com Phone : (213)556962555
Dr Abbas Cheddad, Blekinge Institute of Technology, Karlskrona, Sweden, Email:abbas.cheddad@bth.se
Dr Mohmed elbachir Menai, king saoud university, saoudi arabi , Email: menai@ksu.edu.sa , Phone : 966(11)4670687
Dr youcefi elkettani, Ibn toufail universiti, kenitra , Morocco, Email : kettani.y@gmail.com , Phone : (212) 661 198 993 '
