![fig1](https://downloads.hindawi.org/books/html/57957960/Images/figure1.png)
شكل ١
![fig2](https://downloads.hindawi.org/books/html/57957960/Images/figure2.png)
شكل ٢
![fig3](https://downloads.hindawi.org/books/html/57957960/Images/figure3.png)
شكل ٣
![fig4](https://downloads.hindawi.org/books/html/57957960/Images/figure4.png)
شكل ٤
![fig5](https://downloads.hindawi.org/books/html/57957960/Images/figure5.png)
شكل ٥
![fig6](https://downloads.hindawi.org/books/html/57957960/Images/figure6.png)
شكل ٦
![fig7](https://downloads.hindawi.org/books/html/57957960/Images/figure7.png)
شكل ٧
![fig8](https://downloads.hindawi.org/books/html/57957960/Images/figure8.png)
شكل ٨