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: '9135aa172f96ff93',cH: 'Tk477Bkw3RcfjwUtusByg2I1ulXBM4s2bkYmq.PgUdI-1739794123-1.2.1.1-tqru01.OF3i19SCBUKoYTvi7XkML.c1TMhVHlIR93_jxR61jqAgFz0DXNp7WCptX',cUPMDTk: "\/abstracts\/search?q=Ayman%20El-Hag&__cf_chl_tk=YSKKnt7tlOJmHTgIzNxSEougtFHVSO6rGgL8b2KRvD4-1739794123-1.0.1.1-B4AT81xXBprSgiY13nX4W9slpywRBJB6BU16rTN8yBU",cFPWv: 'b',cITimeS: '1739794123',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/abstracts\/search?q=Ayman%20El-Hag&__cf_chl_f_tk=YSKKnt7tlOJmHTgIzNxSEougtFHVSO6rGgL8b2KRvD4-1739794123-1.0.1.1-B4AT81xXBprSgiY13nX4W9slpywRBJB6BU16rTN8yBU",md: "CuqoDCvkNEOnq4RGKJVeeajmJOCO1nLcVVZP9.PPNLY-1739794123-1.2.1.1-9gqPpZQSvZ4OAlB_UdTTyWQMZZjuUePeoGYuD0_sZx4AEr9M1KVj1p1eoZ6S.94.xgZUMSlVX3hP5l2iZtuufzK5zPXifpHS9k_Qvzri0kzXjKZ67fe3WEU7ZrsCnYi7gndFlKj4j6GnSAfUHDrSDhR_0sOlbiLPRSWsVIox4ebVf1zIKBeYUSyM9iEJVsGLmoxkUDww7EKV4tRoRpKs3FXxwEJU79otAEKOeROs.NsMT6VgCqCi1IZ0yW6eV268o_Qj26rdYMlx6saD2Z7mEVz6wJ9GsRrVb4G8DA_DenQIkFcV.Cvjm_JF7sGlaCb916.4GVLplTQxTJnnIG9xgxF9_6eKPAEq3tSIFXNESrfY7x.0yMPS8xgBn3iNO9zl1bS65szouTJT2Qr4UAUQwX9k4QAchjqDgHATCRvLCRV3l9QEsE6nWGW7DPuiUjd3tgQAHufMFWrD2PCipJTiZeFu3d7Mw.hHupnJNvWNWpeRGaq83GUKVE3xYJixhuFf_4y1GfLXVUhQgkK1ksGnJoVTH.AxbbxHiaY52Rov3YHhj6a4c3Q2wdgmtCx9L_DIPgDP6VlRuNhWorooitGGZe86K0pvs8LaD0HJ_zEyG3.aIkDE_62qBpMn_srid_7kB4NU1Po8hGS38Kp_j9Stc5hhmo6g8P3fwBVUFy9UkYFMJzLD6hFLSB7DZji6fG50NUmQSGDD62SDrsAlqYJkT5dmZigk_kRCSXPDuDjM6nWmJNaO0sgta1OTTv.3Cd5MT.L.svZTRsXqggorGDkfNrWXFi44RfiCjMhS_zdEG3fcW_9wdSPUFunjcjnEUIKpAE9YIsl91hB0rSElhOEN534g4zbSHbHdfClYZjJSxPtwlLT822fMr0.LFP5Md3his3.w8lpNSAWV72FKFYyUnINYGwzVTfnWNZV8nKAIq9i_sNInlcEcu2FX1fxbwSptX3_neLdYWxpqgEniifYxkGcBXT7akAW9vw_DzX.YnIXe7AB1HivdeNe6dPoNAKdOMnNPLQelx7uFKAM1XaZfYd0vFqU7pcmsCXvx6itvbWnVrlDmB8dZft6VYjuOHpwvffh9TiFyFyjVojeBUYCtSB_4qOk6QZkFwPTSLzjYrXz7ZWSMRRsQ2Cy1UVi_5hn_13lWjhhbluBybxZZzTG8pMoOsT57b.tRMWQl.nFSEkNGtie5SHejFm9xMUFiOc6B0XzxDnNQ3T16TrTSlOMBykK1mXC6UaS.9YgEPCBjb74hKytkPkaTPlA42ghtqfxi2xRJQ9FHIvynfSQDHO2HJQ9fuBJjotlm.S37GDErN8CNBbxF3Z3LMBa94oiRD5FFmUCDkkbwyG5vmo8JZpXxcVR0cuHhvvq6XkYVQZ0knmFYrryuk0eNR3cCXeyC69WOQYUKAfDZ_piKs6UXS0XdLghPuWTUJQ54GjD2BOTnFFds7pBbDiabe2CTK3y9_U6oMfhCK.8NB.QIwBtkWnbE_F8rS0Dd8KwHVOCQ0X4xBEdQ2MD.BNmbjVEv5XiKgo9hieMbptK_Kb6UfspQ_w5vMrr06S0mYwAsooVQyI0J1uqmQV4tnHQW.iValC.OULwPB0ufTC1vEHBxhb.YtzAezxNelsq9cMWKCqHcmLjr0rexJBCFKpR4TNO8PZQEJiCsenQikettf9gGEjD2GG0Lu_w.P6EwI9dMVc4hJimLgsgZ8qBtCLxAsbgTRD_dSFmh_r6NDnam2LymO2N1.oUgrt31qnDFWuc5usJisinQulmgomajYKHjMnIxuMaL47gdHC.AHvpzvPpAdzjMhb.ZeKHyfsZJZvWnvH_6pySa_Swtl7l.LRRNSMlMzaGkwxCKJvZrRghl3Tef.ZjkB0z9XFzCSKhfWfuIhrhCUYK5tN6OlZ_zGJhcGtZ.JL2HpVHAlSkxu8hHvvSFJcYwXEXsPbQ8lYJEc_UNvuQrLDzzdmg",mdrd: "zp0WgaWpOmX1mLVbx8Q1W_8He9qkLAnvOYrl3Hkvs.A-1739794123-1.2.1.1-rJ54FKY5mC13rtqkmXbaEBoSbKde3Ho6HG4RzTCfvGFsOAyOvCr0XY0y.kq0_N8K2SlC2VQxsn1nf8TmmdeEtBKgKWBMgowXyJFJdrSz9GZpc5HTe84LODBqj4ebAaVrmSQVvjSVflXSqUdULK5Qg8NFCyWewG7GgRoU4KcE8HTTGtHaeYEdq2hwzBZ92sU5tg9pz5JO8daRXdCSZcfl2.O66BHUobMAOK8I77orQ_ehtIJXzPR9pb67DzAA68pwq97IxaHQK9Vmi96B_.OemgSyEz46mo1WyPnEhxUeVIXeb6L1TDOLHGgAK4JEoXXR06AJzxFdXnw.WSxj6RjYmavgVVh8uZdBmaVENybHYVljxEW7zmZ0RF9QSGnYLNuCt5nXvzk9M8HRen3dq5BIwWsd0YJaPd0POmi1yw5VOVeQfbNRnNKvV7JyRYst6qbnrIYFwnClf_yiMceZ4JNqNHIh81G5R9endQ82fDiUwjeoSdvhH1DUdgQ0o.AsLd9fTs6erncCtSRCo3JzL0OmJDsaB775o4qKBK3nhktH__eYee3oBZ1ylkuxXv0klutPSEwkiFaDSxMdVuDtYKR4uKK_HzCJFcxRWtOEc.1QI9HyrPT7G4J.ifyPyCXDnWjyO6qRBQSBt6T74WskD5epnLBdqRw43hEwgXsZGg4X3VfZOWQ0cX4tfyFTtpHOg0z1cEzTJIYwzfZJ4C0a6.1X5Wa_.pEFwb1OFnCk4DloCn7KUnUlubot.21D9HehKeLM_Q2uUL3tPbYlbuXyNDrM1.DDLvxLa0CgGMGelr2DHVq9Lutmxo4vYBfST4yTAqS3AYokjMPKqQ5_t_8psafY6nc9WrdbAY2VrdPsi28bb09XBbpICwuCO0U9MVKzcBuHlEsP0kcuJQH8XTH88Nzl.pEF8ukdfzrylpiGw1XaYbjwtjDSDz9998ngrLPtlSQ56IFdPTjBABFvzgzKeWXFDf5gfOMnmR4APaFYbib28zWSdmaWG67G1xRm07NYwW5vdS8dIt_HJ84X4gL0A3P3tJXfRieh.JUxCXSOc2CeUUctDk3vjOhY0fT6r4QAb5dlIHqKaOt7uVmDfdRaeer82C28bRF8nsrW2xwbvhIANDXe6Ccc6_rgWb3L4hk8tyQmzPE8A7el7lG7Fjs6VxzhpDMVTj1kLj1LDy.EMh57KYQsJ4ERXJGJ7pPXVNqHS6hYX8x.533kZ4J_kFwd1IxoRFDAEoUxPvyOF7YB1bxavA4U5dP89llo7HTU0aqPW_toxd1TLNZ9hnHmu59iY39qXUfbCuBbQ_ewkpjR0aZJyewl3hDVANliifqRLN6Qh7GMOSY62AIP6qNns1S9sX3NuXfuzylwc4Em6V1TXTXNQXPKAA_Y.GU1Bzz4R.eJhpFV1vhafx7kPwGG6jw9zezXAXnc6TOBJcJSsekinxsU1txs9EjzVKwPdtWd0tDnc99ichFV6dHJQ9ArOYSau7fFnNG0P7N5kuM78IUGpQv6SZLZ85LNm2EV84W0B5ryeGCYWacl9xvKBIoWSVm8PYxDfRSw_11UrCrVcuaUxaElYEQpfvh9gVe_JbZJaQodcjL8Xd5pSj2ZdV0RJV3bOD9kmCaZFGBYVOqaQKKvGs.s9rxStoubntx9oDAQOx4LcAc5_XF_m_lLwO91Wf9FwpBWP3G5_m9sUAjGdtPFeqKH5EqvLT3eJEpENO4j8iNYgiaXcTixkp_u3Gxdaor4ZBpxLXER8LBidKp0lArEU9dxUceCZmkeedkwLH1Boi_1XqjGZW0yek2Z1cs4hjX1PiG2faguFmx8kUPv.yhg_fnF9jBAAVuHerJdTSuFnklzXlF7ZGgGEt6880hjgIkpn.wj4Q0CIUedyVCKVyVx4Mqfj6Fd_HRGLrQ1g9b4ZK1Qjx5l924weQ4Ni117TJ1xfMDNPS838cr_T8as9_XjtAhG_eYkSZTUSmxaJLhEBglj1_BU"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=9135aa172f96ff93';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, "\/abstracts\/search?q=Ayman%20El-Hag&__cf_chl_rt_tk=YSKKnt7tlOJmHTgIzNxSEougtFHVSO6rGgL8b2KRvD4-1739794123-1.0.1.1-B4AT81xXBprSgiY13nX4W9slpywRBJB6BU16rTN8yBU" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>