CINXE.COM
Just a moment...
<!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: '91358bb15aaca042',cH: 'IKqcDJz2nlqZ6r7xlzFgIQvfl6qwaQc2TEGib1CwAvU-1739792878-1.2.1.1-pH1mHz6MrEAvs4T7DO.GwyydiA9LOmDZrECUBpmaOdjlGynRzPWDyYIunhK7KEIx',cUPMDTk: "\/abstracts\/search?q=Gona%20Ayuba&__cf_chl_tk=G8qMQvka_0B1gbNIfo7QQPYSGBSyeRZO8Lkdz.y_7Nc-1739792878-1.0.1.1-AWVPrREDJK9srgpia7CTcZSeFkEiJ13BvmRvlM3cKFM",cFPWv: 'g',cITimeS: '1739792878',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/abstracts\/search?q=Gona%20Ayuba&__cf_chl_f_tk=G8qMQvka_0B1gbNIfo7QQPYSGBSyeRZO8Lkdz.y_7Nc-1739792878-1.0.1.1-AWVPrREDJK9srgpia7CTcZSeFkEiJ13BvmRvlM3cKFM",md: "52prSYxHHq8MXN26EjOY6iyEWiYr.1Y_pc_PkSyFZb0-1739792878-1.2.1.1-UrIWx0aMPMTHKTNF9cPMj26KkMiDWeVuOPIFJ_UPabdYj4QFxqdaCObARwotsPx_.BRbCd9XPTClsmF1Rf0HhQvAwhd3WlCfR2mPrmCn.UD292b2LPUvoGQfoy_y8HUOKG_CdGS9PaBrLRVbyIbPYp_NenczheVSnQE2NC74nx6q3hRIvlM_DJrbd0b8HgXDebyxEL3HXD7uM7LSQXWg6ReYGriGZ.aapQhWg09MriZqBBMKUH0Tip7C5WT9C1Rz_MHds8gWjNd6eMc2uZCF_G7cHdp4yYxWq.hWpshNkEsG9n4xPi3e1lp1Unvz0aR2Bl.wRqGG_PqwKLvmB0cnbsoz_zi5sUIIUmVkbVojFy7zO0.tBepxQ8abt4VrLATDDrcd1rJrKKBdWoS7av8UQ0YxnHwN7kKcbReCiqApqVRs7xvqegMboO2z2_9GwXK4.AsjeI1UkWslVdVAGK8djSt2o_saZdorrXPXfYYpG7CdJ.3OCQ5DSuGg0kU3EdrCnoltmP0A8U0mdMFLCnmgmeYJC2MOTRgDK2juSC90R.FyBPdyZ1YhUKnpwNDJEurgtALUZPcYoz5NunGDyUfdhM7gWe_RmThhWQgA3BYc1AMTBr51ZfppiIDuM3ZcGgo2LjfnxqngxheotS3dn1STlHdDfv8qeNnty2bN8kIkqFwTwCAg8WN1B_pXvWDAEEFebWmDpopWzi34qA81brrjYMDGovwibtyMPgt2cQ7DNEoZp9wSdJQ6ngFco.K6SAKjHWYskdYmg_ckkLedChWHsEbNykVederHDWpVJb1sT7Qz4UZZZpDQeDvYmftvE8UkLMonNv5zW3v1LSuFH.ATRIEp5MvvfvacFYz9Kjzv3qHOyrG.XaIjCZyHvDfl21cftS5gQR5gDECzPINukkEKSBfn5jX8uaW4J0pg1qMKwhQPydZlpS1GIvbFmgClGNM6YXOto7bc4k_T_XSh16NSWTN0R4SV8IgInKIZX63G.hgGxn5LtlU0GtU6iqLzxtHsXWW.7mRM6pZkgQY2gSPwK3qaVHUaGZ0Ucs8QHNKC.hrMvBKvcFdh3TNrW9Z4.9YtZGH93cHneUMhQs_cgrIdHaZy3Ww.on6SKdND.4qYexzRTjsNva7KzUnt7cdNrVG8n9s611LZdyv_y7joQO2V7zhk2Wj_ruy1mNSh73RFZmipsRkSefoigni_6LeIFw98VKcX9s4FCl7ZcE1j97ZWIJgBU9VqAejgyYHWG5kXPUur7bRmKx5fjc3QJF9N23CVw96P6lBcFmOIbBTCZJnkrwJafDxAbvrb9SUhXco3BmUIOqdWgGHmAtAsqzL7gnj0aIKEg9B63xrnmmecsQzI_a_hzjquO6m.8X1B3IsdpiwlfHVDj1bsBaPC7U64CmDtdq_Nwv0YzzrwxIef_zEQcV.s1U5at9CiMdT1ZUQRhzK7Cv045PDikeulc9pqICQERT25dTb3q0miDkutTJ82ISrSmFPSU_b8bDT_3hU_OGm0XsRw6a1ESBdqTAIAmC9Z9XNhd_FBZGye5F3R6dV0JzWdvYdRJGHxAX4wksWQ.8HlIb.VoSOb7DpnGMugpfqm39gFc1GkAMswOrk8i8Tnnxv0hcWhVKXLCYkQJUWZ_RbU.k0VciDbqJJNrKHspVynDgS4jfp.IAWp49qQunC2llV_D_8oUTekOeWmLf4chqU7WNuc.mNifP7PzIaH7wKhIPjM_vV2lCQQaaL4pIEUIR2k6VfOT8_q7gPV.d7epqyp8uYksi2UwrKRoNvIouxqv8OihIrZlcNsXBm761IO4.X0Xw307VCHMWaGiCIszUyQE0BMDf_YI7lCF1vuLc_hmCmW7jGxEiqrz_Yo4YdzF2XMomwMFQY5PWcQlgaMS6zO8rL.bU9DFGh.ISnO0ULejIvGOfHMv5GbziRLLLvQgQ",mdrd: "jGitrg391j0yRfLyM22FdigJL1734Jfk2qX5jD1hR8I-1739792878-1.2.1.1-l8ujn6Q5V7kQTZzpmbIn2TkF02xDWgMv5ObWaxqEAQrwd9mogkVAB3C8xi9vlcuq13DD48C6FxyVG_xWBWFeg8iY1Xl3DQYthjMpgXhx4XV8KaOo3wfNGVEUPsj9deFvc4Xi.X_nRdPWe39kcQuOK9b6SganzEMPq4oSAxCxeZc5WGyzp10bwyFgo.Y9Mz86Z9JZG13FUNKbqzOJJqWiYGTQZhD3ugFk43fGKEBR1k2czyYc2jKyevIt0VaKcCv2422HQIibnsXbR8ImzyqbZ0psVqnJ5iXlGkjPJnt8ojkDKgOlJ20eGmG1HA4TzXWQTLdv5L8662h7ee2INHOziZQ95cIScUKN6wq6Uth4phQ9xViY6QihXKfbf.4v7gtmFBRGHOLN_vpb67zWSMVevMJGxRVuSTMpDZsXzqLWVhMcjKoLYCSBmdPfy6KqajbCh.gd9jWpkdKsSC.tlKtK_qLWh49cjld1l4KwgdCawwWbzrZH1anrxfEmCWSdU95Ix1ThiGyAQkd009ZT8EY62Q2x_4KioahSgCKc4b3Xhl8d1KSyT71cQlSAqtaEdzZ7WBZHd5hgpylaW5Mnq1X9TlqblCOW4KiJkUDpmV4MJpZKMEDGiJj2c5c0EQs7__RamqFneBFeaJD3SzVZRzEZX3RKZzgRXYIPy1WfDcZ0mzXBzk8QPVcyWR7CEnDulBoOhFabXtp29ONGrt_HB8OQNfCIa4l9i6.Ah7aJCiN.Y2SeiEWxRx8gpBcnpreCrv4WWe9QI.spALqbI5P.rKgFch1C8dbWTP1Roue7w9i12wsRtDT38FugsLUKKLDE9xWS954.edYOzJe.DDzgheWFZ.ZkmO_richgtLosoKUsfyyio_ImW2W52vjpi5pqOSsMZEundkYAcUrGAttm13ZIhe620uWIFKfruAP3ADijGqrU4ZCYuN3GaqnxsxkVsb43OH0OiX.HJwEbNXvu6not2.90N1Wrbc35XU.ty_Zamy07uGd6C_JUwRm9MSzVqv2WObz5SddLK0zDsoNyyKuKNBZTgfM6.FFwDw8DdZhKxyrqRMcOM.nJ4OTu0CyZa4K4za9w9ytHu0.inNWNNOCvW.47r18svgTpKczjkIStHOVBObCKEAzEDs9fRvt9UksesBiUZB5Rbpy6jY0kOUkyaMFBqXCtQIw6a_lNDiAgGkTICaRLUmQiW5LaAsuY.YQ8H2LeY9RPgSsMADkURI24QIXlVnQ04wdHU84ncJMKo5dfPeEwIhnZUPARHxQfF._LMuPBBnbE5KRSIXUvsUeiubjot0tgV.og7_JopS8LmSFDcxhlSgkeO9pUdERTA4Tch9Zuk8y9aGmI_bO71K8T2ivt7NKvOC9zihsuMJHFa9Y6LhKzuFzLmyjyYCrmozuwFhC6_fNRaTYzC8O_mfnSgpAUasu8PijDDxCj_5i6WTQXWX4ruh5yEkHpbF44xbBzqUkEjRLUInEKsGlQOWHWGaYh5Numg9PNypxwbnew_od7qTdT4d1DgF3s2t_aGtAmaEMCZ8dt67pBy.KW_uOGL1DVTTsQXW_ya7c9Xqjy6Ab3Ym7N6apzjgEwVHrrqRoEe5.THQv_dHrgz8k4vxFQ_5YnJdcX_XUPyPUkutMHdEL3AvWSb8PDGfHPLmb57RBFltndvmaxoRMGStDMVQJSbjuY9k1RHJxJHc.YOD7pZ4XzIO1tq8Nyzyi81alr_y03_J._Ww3qyf5u_xUh9924pumonhJBTolQXOofdTHMTfY8m05OrTopwPKCXQQXnPYqry4WBIVH7pbu_lRFqfoK5JkI1UFjbhzRKZGckjQYXote51EF7Nlrx1QxFlPHb95RmNgCfiS5Aus4ooxRmOUERnTN8_DYYWZliKMHPM8YmVBLHrcORk5z90foy_R5RhPDIXQODoWQw0oLdbx45VIrzNYBIBh8RE2SNVtw860Qb7ujAc9xLPlOqlMylI.8DjUn"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=91358bb15aaca042';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=Gona%20Ayuba&__cf_chl_rt_tk=G8qMQvka_0B1gbNIfo7QQPYSGBSyeRZO8Lkdz.y_7Nc-1739792878-1.0.1.1-AWVPrREDJK9srgpia7CTcZSeFkEiJ13BvmRvlM3cKFM" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>