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                                                                                  LES PORTIQUES                                                                     411

20                                                             L = H =10                    20                                                 L =10; H = 5
       W                                                       h1 h2                               W                                           h1 h2

18                 Hα                                               α Hα     α              18                     Hα                          α Hα              α

16                                  bLb                                      bLb            16                                bLb                            bLb

14                                                                                          14

12 12

10                                                                                          10

                                                          k=1                                                            k=1

                                                  2                                         8                         2
                                                                                                            86 4
                                      8 64                                                                  10
                                       10
                                                                                                               ∞
 8∞

                                                                                  Z =0.75                                                                           Z =0.75

6                                                                                           6                   k=1
          ∞
                                 k=1                                                                     62
                                                                                                          84
                           2                                                                          ∞

               6   4                                                                                     10
             10 8

4            ∞ 10 8 6 4 2                                                                   4            ∞ 10 8 6 4 2

                                      k=1                                         Z =0.375                                    k=1                                   Z =0.375

                                                                                  Z =0.25                                                                           Z =0.25

22

                                                                                  LL

                                                                                                                       HH
00

    0 1 2 3 4 5 6 7 8 9 10                                                                      0 1 2 3 4 5 6 7 8 9 10

20                                    Figure 2.20.3.                                        20                                            Figure 2.20.4.
       W                                                                                           W
                                                L = H =10                                                                                          L =10; H = 5
18                                              h1 h2                                       18                                                     h1 h2

                                      Hα                                  α                                                               Hα       α

16                                                                                          16

                                         bL b                                                                                                  bL            b

14                                                                                          14

12 12

10 k=1                                                                                      10 k=1

                                 2                                                                                                     2
                                                                                                                          864
             8 64
              10                                                                                                            10

8∞                                                                                           8∞

6                                k=1                                               Z =0.75  6 k=1                                                                    Z =0.75
          ∞                                                                       Z =0.375                                                                          Z =0.375
                                                                                                         6      2
                                                                                                         8
                              2                                                                       ∞      4

               64                                                                                        10
             10 8

4 ∞ 10 8 6 4 2                                                 k=1                          4 ∞ 10 8 6 4 2                                k=1

                                                                                  Z =0.25                                                                           Z =0.25

22

                                                                                  LL

                                                                                                                       HH
00

    0 1 2 3 4 5 6 7 8 9 10                                                                      0 1 2 3 4 5 6 7 8 9 10

                                      Figure 2.20.5.                                                                                      Figure 2.20.6.
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