CINXE.COM

<!DOCTYPE html><html lang="en-US"><head><title>Just a moment...</title><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><meta name="robots" content="noindex,nofollow"><meta name="viewport" content="width=device-width,initial-scale=1"><style>*{box-sizing:border-box;margin:0;padding:0}html{line-height:1.15;-webkit-text-size-adjust:100%;color:#313131;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji}body{display:flex;flex-direction:column;height:100vh;min-height:100vh}.main-content{margin:8rem auto;max-width:60rem;padding-left:1.5rem}@media (width <= 720px){.main-content{margin-top:4rem}}.h2{font-size:1.5rem;font-weight:500;line-height:2.25rem}@media (width <= 720px){.h2{font-size:1.25rem;line-height:1.5rem}}#challenge-error-text{background-image:url(data:image/svg+xml;base64,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);background-repeat:no-repeat;background-size:contain;padding-left:34px}@media (prefers-color-scheme:dark){body{background-color:#222;color:#d9d9d9}}</style><meta http-equiv="refresh" content="120"></head><body class="no-js"><div class="main-wrapper" role="main"><div class="main-content"><noscript><div class="h2"><span id="challenge-error-text">Enable JavaScript and cookies to continue</span></div></noscript></div></div><script>(function(){window._cf_chl_opt={cvId: '3',cZone: "publications.waset.org",cType: 'non-interactive',cRay: '917c06baccd481c2',cH: 'ZHoLb3B.AsoYBo4RDhJDTWIaGTtmeceHLq6uwiQRvlQ-1740531921-1.2.1.1-osPbMy8CxjyL5RecMvb9E7uOqM8ORLRxpck.HwXhfsewaJqolxElcvnSnUAlMZsh',cUPMDTk: "\/search?q=Boukraa%20Sebti&__cf_chl_tk=G5WXbthGiWUOA6lnpGRXjYIqK_B4bZuuiNPnzAgb7KU-1740531921-1.0.1.1-M9FpbubLWUP_2fFlGFHVqBVzHhPXeOVxSgA1oFoDTRY",cFPWv: 'b',cITimeS: '1740531921',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/search?q=Boukraa%20Sebti&__cf_chl_f_tk=G5WXbthGiWUOA6lnpGRXjYIqK_B4bZuuiNPnzAgb7KU-1740531921-1.0.1.1-M9FpbubLWUP_2fFlGFHVqBVzHhPXeOVxSgA1oFoDTRY",md: "7RoidyZ7K3GUuNmXadNotoosTwfG1gyNBYnnSWHjxBo-1740531921-1.2.1.1-tYCg55dv8WpdkXKYquWiA9bhShuQFlSFhaDSiX1BZ1nUW3_BA.DGUSkBsUiMhp1e57OxDs2K3lRxxINxrAP.B7ol6YF3cOE1H1Whr3fl0Jz.h.bUetFgqQeKDlEK3qbfwjBc_LKsQ7_fyYyM2FPywDUUatECO6g3APng9DSblnQbDsI6SYkA54CoCcQLrBAtPVItUjoj91UhuPbU77CHchtToWJ2g77b7stCuJ_AJloBhJcp9jFsU.YhNdFCw0z5dWLPnB4kopcpw_iZHGokcjyLBFFMICK4_TWJGAwf.sMuApx.HpiW1kVbJYhE.DDOzoOo0k_YzfOfCvw6kdZq8guhyRj4up2L1gFWtUGFE4Mg20y3WuWRqot7fsWgIMtk3msTedvggn2vk4EFm521YbXd4MGczmaX7enkj2JzNAg045AhY.JA4nrEIlKHreTi9bPOggkgTTdHMyKBexa8Ei_vmsa5NUq.UnSW4PzbzaxbEiegXpQ5M3y8eM0lVIYKMEj5E..Lhml.qX4u7t9mArTlYyTxSfAwCz1Z9Kv381cXEaqzLQOQp6nLyUT3gvh87he6uj6Esc7rXKZ.Yp.Z9cVq2wVuUyNk5CyGS3vOJpzr1s0dV4f8NT7bH98C3df4Yk_PRORCIm5F7w4NHMwAwmu.H4q2QcJwSb0OqS5kgVzUZtzVb4TylGDpINrm4kV8On3E6HyC6MXBiM6NITgwvmgsCppvJpnBCyOk.bd1sz5CqLA8TFdva0.blYi3hSW3Q3t1ahKfEOdMXJJDFzwfjo9sC7L2dzXIAyyK0r5mQmfmLRgctPUeIjZ7AsxGhFvxwqQJOoQuYB7BT2RBJ7L2xIkXgOxqKuP8D8JcK8mpeb2XvWoMkCqEmvJuawiHyshYoJNkDir7Z1u26M5NN09Mk_3xRzYXBuyJbPYWuIKFDWt0rp2zJ4cwh3VN2ZYLXnYhr8Y1_D6nW.2OQQUtq4znQYoc.SPO3Xh8B5phyfHnayX7IifVsi5tyVCbrogyna0x5w7pW7W0J1xyFhfunNLq0WoiAzzWlfRC1821TQ6TL9_0ONfSyBG1HW.QXObwxG55xjnsRyxRe2Pj_G_v2Q1Vr16.Tti6SS5ohzCzVneJMAtflA_TK6EmEiGnPwIhDag_jam8Kmfv7pvBSRcK2H.LdtzSfoPGof6zeF6TsHEibjaVlggDvk7zzNwJboK9hrT6O0q8EzVWvtM.NS_Cgl3XHYctZvcBTmg7Km5B2oXRcCABV_5VFyZ6iFpeFAl_WwyX.cCQ1AdiaR65WXNAORyhvLiYC_P7cR0MzlHlWl3y9vEkjDCz.L_WlCoDHPntVt41vHiorSa5y2cDKj81vT1lvC6Z8Q500lueY3PvV7cwlbOg4qXrCgUY8WA41hQPOatEebDQDE2WS_VMA.7LNkV2WoNrD8wxbR90aekrhUJ9hJZeH2NTWLUG_JgNzePBiCdPPFls9So_9z7UGIC64WPa_SPl5frxwIytmBQUbYUN78XFeFJSKjQadiTIzaXJu_5cY2vnsNTJ0v.5UbNs6nxhbJXF2GLBzFDqUBr2W7WIYj.sHFOl1bnFtOWulT7xJNIQS1b1b2QI3WzSsjugHbD7pnI5ExBvXvCfQwysaGZDbUG8tpiWrtv3AGfHBlo0Yfdl5tdysfAfsNNNTBAZn03jMKkrLkCdyEzlteoAsgEdBBlt7HwErdXgu8LmRt.u7sOk8Bd38VrZ6N2FrNe26atF4mtbhDAi7scmo_yvT9v5QjZTlg0IbE8z0VeXJj3wRqub6ecgiHaOsLOOtqA1N9EHkhu2btuiBvRJkRtc8niyPPi9O0rqqZLFM_kTYY54S9JnG6NUr3UvLPKMoBj1IETA52FAXS.4A7wg39x_2LjrZtQpvGLvdtMC_v.eTW5pxLy3",mdrd: "_NAxNTLpZOd.vlD6YCwtP1T0ZOMnIsbcPYVHbt1o9MA-1740531921-1.2.1.1-ax1.BU6C_5AaM19Ivm7lYw3VQm6XEQNdJ64ftS0ZmHjp7KZuZqhHqsi4Xv7szqqt0b85cUWi9mXrzMzPqUSeN1_sgayEcx6ZYQyGQTkJwUT0._bUA8vLwankLuzNrWxFPATiboeMbPNBlaKnZ4fahWTocL.eMWg8lfDU8ewt_p5W0_IMqRJ1wuUVdBrrcivyDk4RERtMrVGHlB7BoWCSzD0pzUhmGb.aBi1Ks0UDvOZMiw8.nD86TyhydBYME623uYgyUxDNtus7AIlKAuWDXs84eema24gKY1nep0dif.5dhHr.v_G3FLcYwOxwGp2UkBSlNnG5kum_tQyLomI62zjIVrRDwQgY3EWqYdlGrCDFyWGN3iU3EL6cqdm3Vug1bql9E9F2anCsYK0YCMEGFRGP2vFQzK.rlXo4kK.JV4xwFR_zzpn0OWVeL4hdI60._KKMFCr1_6wXS2_JKM9okvACL5mIUMgw8M7QicXqheQudmy7f4UYGFqrZuHeUmhygf4qzJO9Xb5Hx98u_1YzW25JD555XcHR8zuZDPBwG2r9fHCVIgmaTCiluPrnBQXBCpibkMgphizC7XDe4NY7MLwhrLKNviO80cizYsZF_vSJFLn3_IEdoeMj5zPvrGHR_5DD5SmsKaj14cf_T9mqC.qAKMRz.WPAEewYT6VbrwNya0pf8TJ_D5uuWhnZtJjqVuFgyFjfY04CaHsBlexxqY6P6Y8DspWHntrKdhB9rZSqNfZORtPb1ILeT0J2JUKS9FoX8of_lG4W0Q4vVnl6pkdmYRH_fy7D3mQcHYOZi95VLFi7boN2arkcmarO8Mn6rGPAr3M6PHtjRtyKGDOoMifYnDPqwTtFsXBL42_PNlhMYnAC5i_.BvLDNRr4pAnAWUnR_f08gk0CthefQOHf1XIgIdk_prW67o41dJMxNKFpMuYmTcdwVXaRsnuM31yIaOQapvvShofE2R1f3Z0XAmTtHt8GnoHPrVJMVWio1y.rb7H.01AJ_reAHCk.xndTpUN871wFvmqdYZEX5uEubiKTol6ukm0nrqkkBzwrnbmHoSy.vuKfVZcl33.tz7sqftt2.qVFTbW47RVI2zkKaWEIaicXzIPZTUj4sIWTHkqfruVyv53ZVQFjg3.lnNNT2F1JUBfGGwJCW3TA4TR83e7XoM75ThUmNPAGLrBuqYkiZNHf2aU77Dyw7fWc_pr2wKxoXE0lNsf3agqJm_chLNWPUCD4XHqVwVl94nK4r19RhzARz7YjBzhPsmhHC1z.sMgX.MSTUBMtxmM.Pa_pqioXxPwdGBBXHWRmb7rP0720HyRkHTClvQ6lbswFNYP0uVJU2LZVZrnMGDhYeQTizsoFO5q28bVsqEqTS4IemcK8NEIbjGo7IbmIAASPEpgrBsAwPWNFXNSf_tiKhIcVgPzWZ88U8UP8s9co_Zu0Bpal.t0TH64TM6dR5oGUGs4MJ0XfX_JGcoMGQ8zbTZsIAr_bdS4VkcPTCzPHI8Ve8Tz71ptQjhtJRyxTRnDMQPs1o4Q6qiUdV.xh7K8FcVydnsU82jCr_PjjlSIJATLrmhY4UjDQociTTXmErbPeUW.3tAeHBNFFg_TncPy7cEtyFUcF5ounXHrUhFtAc9C870DQVPhYHR4nlb2E6NnVdGS4PfvTzChD9qawjZqevDeueVpjVjVcxFs.ql6gFco4ERr056devFezMxk9nalbVgaN_Hzz6KiCmQbZOdjuFreIDGJHHE3fW7unvqO3hhfkmC_J35a2FeojuF1BTTwOXry1oHMNTcLTkeJXRstiOTvOUpflzHTkdUrBm1o.cnDP5EpFv_7BundDrkG3jLytJakqkz_g8jQWKc6g9RM5urw.tOqebUseAGzBcIhBLch_dJrVX8jfVCfOLIPGLDBPk4IrLrhXbA3aWFwsdsQusO6fd.fKd4Rv8VHkA2Kq_wVHqEoCa2T1vLG4Ol6fbpXCCULZ"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=917c06baccd481c2';window._cf_chl_opt.cOgUHash = location.hash === '' && location.href.indexOf('#') !== -1 ? '#' : location.hash;window._cf_chl_opt.cOgUQuery = location.search === '' && location.href.slice(0, location.href.length - window._cf_chl_opt.cOgUHash.length).indexOf('?') !== -1 ? '?' : location.search;if (window.history && window.history.replaceState) {var ogU = location.pathname + window._cf_chl_opt.cOgUQuery + window._cf_chl_opt.cOgUHash;history.replaceState(null, null, "\/search?q=Boukraa%20Sebti&__cf_chl_rt_tk=G5WXbthGiWUOA6lnpGRXjYIqK_B4bZuuiNPnzAgb7KU-1740531921-1.0.1.1-M9FpbubLWUP_2fFlGFHVqBVzHhPXeOVxSgA1oFoDTRY" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>