4
Dedication
I dedicate this modest work accompanied by a deep love to her who watered me
with tenderness and hope, to the source of love, who taught me supported me
and guided me towards glory in my life my mother Mira
To my dear father Mohamed for his sacrifices and encouragement and to my
sisters Hiba, Maria, Sabrina, and my dear brother Adlane
To my loved ones they supported me, for their encouragement, they were also the
reason for my smiles throughout my academic career
“Akram, Malak, Yasmine”
To my dear partner «Lairedj Nawal El Batoul» who had the patience to work
with me and who supported and encouraged me during the difficult moments
during this memory
May this work be the fulfillment of your long held vows and flee it from your
unfailing support
“Thank you for always being there for me”
Rouabhia Hadjer