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: '91351ea07edaf920',cH: 'NEYDXmisp8ZvxWjNNaFGSrr8mp5MKL07gx_CEEufKaM-1739788410-1.2.1.1-5DQ_zzkW53y.opcTTz.VtP0XGtc7Wipxuahv.vjkMYfXUYEetgHjFSfYIk2Npbv6',cUPMDTk: "\/abstracts\/search?q=Simon%20Mulugeta&__cf_chl_tk=VHVgtjARG7IM0UnwUMfIAEtrgM_jC1vHyzU3xyagRJQ-1739788410-1.0.1.1-YKHDMyFBfNXQXIH29gHVO6F1CSWw6wiB2nB7vVqYxig",cFPWv: 'b',cITimeS: '1739788410',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/abstracts\/search?q=Simon%20Mulugeta&__cf_chl_f_tk=VHVgtjARG7IM0UnwUMfIAEtrgM_jC1vHyzU3xyagRJQ-1739788410-1.0.1.1-YKHDMyFBfNXQXIH29gHVO6F1CSWw6wiB2nB7vVqYxig",md: "Cxt0fyOTAPMtAszdJq00r9LXCpDZPtkoi1wjJxax0iM-1739788410-1.2.1.1-PtlIcy8ld6OmBU7Ynzo7HUUPksoL5ohnFWYOI_hQRl4Ux.vlfMuvGOHTgh.MiBVy9STEV.rAEqD8rQCQxQWCKbxMZRemKZTOMGjoglbvsXHjAbCjc108PKrLd4lG6hlgZ8BlYAStJoas3eqiuRtIRx4F5A6mg5wFbQ8o3FBRV5jQVH.B_uWYv2dY.Q.FpA21Zro4NgGas4jq9y80qiqR4n8LMVs1S4g2rjg.jbVwag9IffNHzsBAQ008r8SXnUNJgqAoQ6dXXAMSN4FtSEw3w1.a61v1nV.SH2bDSjucGPQznLm7wlVLHNf4OVqLBSUra6NWCs0cq5MYH0YlbbdFaOxDZSNAtFmlGiuWwjwatoFfQ9OnhOUwF7e9r6.Oe2NT40L2BXsCd9f2h1s1ucuw.t2HTmVXo_L1N1wS3I283Lc.YDD1CI8GW3Yc4sXEzQ2rzE.5p.doy7HPmD1_4MRVj1nY.iRi6.eO14h.i80qdNBKNg6sbC0Dm1kU5zutSaLNHNxbKjj8Pq4s8T6oqJ6qNNcgJ95qBFhIrWexC9537HKia7WLjBtnUNylwOVWqZjGoDkkQ4hLu3gp95qb_FPxv3PT3fZkjkuyPhZf5mX5.H3CVtIq5tlV8cTyfeF72k0C9D_o.Xlpdg29Z8l6J_X7J369lln.0JoNQ6or9JfjL8X20VntVZyb7yOchkzivsfMjKMIPehyHWlark1QaTvTsiMpw8UmUyNvawajwPPop8WXd4IfV.fvKN4uGTR5S1GD8oVZTZgCgZpxJjkcpNeI6xek1jvCXtnZ3F.KswHwfUvVOZIQHM4.huWzOkH0_6Xg1y9BpKFix5xIJZTlK_cGw013soNfy2TZU7GDLMfGCkv4psbw_w79aYOnxzmKW.2C2RhVKl5SEcV4DYdHbNIqxI8AS6vLhlZclRpDt0i2rhPXpxAWltN9SlAMVeC9g1Yz9jDKOC5JQRRtnSYtBMvjB8.w2qltc73UOdd0DxOWmc8weL2zkW_kYFEf.tvX2I5CzrrCmMBkrqjlJAtZ5Oaml_ruVVuA49xE_Ec69Z.KaFVWyrBP2Ta6sPPzbEgtbqYfbPsaDilRmbloc97vQ9BsbXk2sQHsFT9XEwDkYV1UUpkmWis_WdmyXVaH4V.0Z4CHPC4H_2WNpmixjr9ZlzdGYwJKfi0JWBitZkBzntAZAf.ozXflOYnaJg.Fj08O2wDMoH3u19yl7Wnh4otVICfCFbFo8PiCGUGQxU9MprzkU3THpy3tlWoVICUOl.Ii5efS356FaWHILindGkyOUftbj2CKQoUx2dymDYIeeLtJJATJhZcYKz7Vr8RNIsDYMgoozfW_bW3QbxwHXKp8OIAj3Jwx0A82diVxwWHIgwoSDRrD1BdDFQa_oby9TVpZjFjvsn8QeDWLBi1SPpI4NRl1CRWjo_rVp0w_nOi4KNYQgkM6nD.TonAGe4D9a7YR49I7L0I0ZJPIdTARrWxzSKp5wa0vnEhUqRlha0Gg6PugO_5ReE0ZX6.m4cIaUD7zqJIDFPfKpRooRA189MDErMWPXHw07u4wdjZU6oRTtae53tbxk_WWOyF0a9Q_2q32UvifsbZdb0e3DRICDpsks8ltOFrbxXwytrUBCYXL2XVycNYbkvjL7YWYq5iWq5gkA4vlvUfmuVYSJNVA599SREs3WoY5uaSuyze2AkPvzXjBEJeWIwCNnzchu2zhVq1taKNkYjQcmFtoyxIs0ABOd1qo_CF6ZZYHiYQhnlAoy7hUYdDxoqD3EMQyan4pRfU638ahmq8ROaqX92NiDbuWZ7ehje4eLVgA7W3qneY67bplt9D7wRgosLQeYMTiqv1t5xLqts.iAGg8SXuoyLSlnjgvqmZ425M4gs9rHEBJ4e4Eqc5Kelx8kRUlXEKNbN9N3nBdVJfq9IBP84gGGIYbKb8SrcTigNHIedau9uxuKRiXVvw",mdrd: "jvARWbl1mVX_4Ct9g3ZYmVz39iF9FUCf2vskCuAsUl8-1739788410-1.2.1.1-Q6shbrtcx15wGGHuKP54heAz3glN1w0aXweBXiB6qxG7ZmyWygBXo5hkboQYEAQpxHYut0Dcfkvuauq38byq9LznWw9wRdwphAXowJ.2x7LPmfrCXJF8K51Fv7gUl_M9a9E__gZZ37ekF0NwCCuv4Mcrr582O1D80uBe0WotN8KpwFnVUcnYygZRanhhsWK0MPTOYZX6tnLVQJTjj._o.RpSzxxebEeGu2lVsuqopetcP0wpcApBvCx7cZKZxGHA5F3A0cAjFZQL3fRoQ.Z_QvBtNIeqOuctyBrN9_lR2JXOBwz.YsDnoUmGAt0FgDKny_hh00AT0z_9f0EmGSxhJGJ936pf8L0oJDYOID_zaqZYC_Q7z7LSMrL5ninPyNgF3DkqiYDc07uFwBfcThnU.6UXIk.dGIQxNQOEnK5YtKCcE6WGyKU14z0FBilUT5xwwB8nskOd6AyHwFd9z_5u5WFLCdXtkGNj_v2hRULW9Z.0YNuLakY5nD9iLsR2bdtX.HAFbpTu9CfTxWplCE7Ubd_D8Hotq2nSoJiZ_2XMBkqmJyPxQZXmcdwC182ftTC6j.BZ220hKwVyJbdccFRv0Zka9_6uCrqXV.Q7yOjg39gvVgiQFlB1gIcToTUEomCJebsnKwdscSUk0CtsgaoIpCo6c06TublBwgPoHzkhObh49bSLEES7sxXg7JvJD.JvNHURM4jC9ntklZmpUxo.KMCKgZjuxO1ag2rLPp9k1q.PxFkKen8u5wIz0.RSbiqq.JOpZmj7Z.GcXExkvncNch19Gl7tdcILcKm_VRkXaBGiYXHEnCW37Mn9KMI01SnobVJdsms3RgSlCXJWsV.bc4ZShCWypDuDnb7weZB2jnbrutQ7AtTNApVjDdhFfusNhxOsGHF6Ei8oXT8ictLZlwb0c62fdxvAI.d2P2GCA126F94GGpkF6gb7hkxCYWydxTS4GJDa1LnGXFwezWuDqMQO5nB8mCJ_sD4Fk9lUc4TLaMJEYLL8hz.Jb1jCVGKw_yawmMS8zorNzfJDr4iH2CSSvOCfxH5JZaL3lGIqTh4maG9tGtVmq1zKtoQ65bRh.acZzxsYmG2UvLPd5XN14yC_DMN3xGotdmzW_a82lNED_juHDVEMcIXe0HJpWhbQ_5_uG1oGw46kJRj27XWBBpiFitGn9LEgzk_K9uw8M4qpmSahjy7SWmUfJ9_CCjSgNsjeu4EeLfcr9oJqBSzx8gLd22oV1npXRjIMbHenC_01MFv3WiV94zeIifpntl19yEHUU.AtY0xWg_UkvY.uaErWhalbTgOAIyirZYxMYec3kmmo6qHznZU4rVMBPnkUw5BYFtUuERFSshaxPMO6ajVdGTe0MRKKbMVqQU113EITcja6spBp8IeZqtuFM6ZojPQ0t0irbztw1o5uwLdYITWFihUYlr2W9PlAMRHL8DfLNcd5rKo_6AR6Nv4Vcl6NE1HaYMut0o6D01r8pPTgGgMUqaU3DKB0Kg5W_YKg1Rf04vDWzVWYj7GlKLOUaTnpqcx3Bm3YEUt8P2g_88tMpr_4WVfxGZsQzi5B9CFN50BYL9I8aS0qdnevNFBGehOkQto.U1R3Ik4du4vZfGg1RbaPaH7lzXMfiZ51zEA1kxSutgCqRsXF6kOj9l4FMT.sj0gxC.bkRh_k4Xlkpo0kPe3uqApEhYvLN.nU1GmcpoIJYltx59dE6uB7zM28gzZTkQ4My0SulxNVnjz6dpwsflpkMHd8q6HldO28JrssHXW_WJTGQbMFCdcGkJpMR4445k_m7gghpxdSjW2ePirA1ss6rGM3pv_d9ysCgCGDWUppnCxzsueIr35C6JYKg.P8lnJG9OaCsrT4jp58txhKSAeO_FpowBSwkBO4g3p4AULLg6ylwmoRcph.YKpInFfvHQsOZUfaUX.8zvEcrl1UH90rNqjYOJgd.cbsCD3hD8KYzaRyuGBWK_3_xdo5Jw056WzRl.W2Y7JLRL11ox2kKw"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=91351ea07edaf920';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=Simon%20Mulugeta&__cf_chl_rt_tk=VHVgtjARG7IM0UnwUMfIAEtrgM_jC1vHyzU3xyagRJQ-1739788410-1.0.1.1-YKHDMyFBfNXQXIH29gHVO6F1CSWw6wiB2nB7vVqYxig" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>