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: '913664a2f94940aa',cH: 'DjmjYA6ePVmosYenE4hYrhCl.JCuERIyr3G.EgXGiYo-1739801764-1.2.1.1-CjLHVzPR_QaSqcvZwH1zB4fIojD5maNbwibbcEow4.baneahskfYUZnCd0E0vT_D',cUPMDTk: "\/5238.pdf?__cf_chl_tk=7zcTN3T3AMgnkc3GfCMSHEp6ukYEPwzcVp0rSLEAh5A-1739801764-1.0.1.1-dTfse8Zj1D9UbxJMugowjb57c84BsJXm5C2pcbx7upY",cFPWv: 'g',cITimeS: '1739801764',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/5238.pdf?__cf_chl_f_tk=7zcTN3T3AMgnkc3GfCMSHEp6ukYEPwzcVp0rSLEAh5A-1739801764-1.0.1.1-dTfse8Zj1D9UbxJMugowjb57c84BsJXm5C2pcbx7upY",md: "VqdITLh.1OMJRu8Wo9Mmp5jryfD_cVC10tKihHeT_2s-1739801764-1.2.1.1-tqWU27hUIZgAUWOK5gOgMWZdSu8lAL93HiIFgxjePfQyEY6jRxPJvSDmrGkrDSj8R0qP45qjaDRGMOvyJYoIzfAlacbLwJWEVFAmWl37m451BHIpL8Z.gdIROT_5.CxnEy1_rJ7YjEON_tXqSAtfvqYUiFetaUzwkmIYsDdZV7kYomfVrX11AYZUpc9rXPIEAK3M5qBdCmBgrcguIQjcvtWmamczVk3u3H4bEohQvg9pywrmxa.dWe3ugJPnxIptU0mpvt8GaQttg9JHXEsmGlJsNOla8RkzEkWjEuBGJ4sFN0VJ9YA60cJwP0akejVHDZkeFQamgHVwbA5IIGLxljFj5Dddu.h3EMZZn4sAahwP6GsZZa4ocskVNCTYwxQlNuq8n1DCUkCk5xVC.HHykNr56QL4n5as5KO3NEbuSGL4mWGL7re_J4GT78d8P42MH4BCXpQZCuDxXO74fUK_B0w1soCe6NvcF9lMER._eAOmrSD57rwWrH6iQYyx8OHMDykdulqmV7I0fUJ8e_9sHBOclSjziyWHhxJK75ffFzIOjx3q_kC8gOKNf2aTnCeV2VSsrtqFUyzxKhI8LCYe0elZN4Ycp6JFdnFQAHtKKGUndvKfo.hSVHJYDQrPVENpMRVrfEomxBQvDf8gxg6mp1W7xUmF0rTqAY86plJ.zU0CIKnYDk.al1yy0_9pyfNq5VE1.9sEiUR9TH4uBkDgaHfqzAq9UnbHBX1EMhUJJTAKuOgBomPVFIKENt9advrnrR9hYN16WWyOEdQYdBTPfX2jwuRIIrLSrieD4AXA12.QNAJDA1Y1Rd3cnhdNhsm9dRzFTXvByKD7n3ZCPdi8ri_j06D41xE7G3FZ7NA_pSaiZ47bXVoBHs0xtT49a1DSAlPgyXPAGgUVIKTr5oD2ZXsMbqKUFRRylXT7xOpronGfVSyUf7JEu3soBrvWyFJix3KTHsdsSINh_DOYwlAE_jjck4I3REE8BDOShjK.A3iKHGPOdwPU4wPM_WAQ2kUZYQYBob3dvdnQQptfaOTX0EKrbJb3HxUTbpLZ.ttP2raUQsM8Ujt3Pzy.oUQV8XHSfhGRD9_pFzuGebdlxgNX8Nr1ugfoQmlnz5zy.ZBmxljuufaGoY7uSqfUeJV85AFJU11M4lu_BrHYq0XPUYpPXboBwXCVkK5BGMFIMBq_R8teEp3wjIlvsAkYBMI3.Vkqvc.pDPN_HeZC1WVQT5CLLAdj1vfrLXHvzcbrRScCsnu3Qb9uqXpged_26feaiQloHxh5dR.Opul1hAK_nlGukRh.RwME6doMaWrFh0ks71TsbmyLSKyclUV_EbnHQRmbMe4KDBoHlBosccTAes0fU_IHBadqVQbtTE3C0j4o6N35rNT7MYfoJx8qUTKJq1lHaZ0d3ly9W._M9TwCferBc7YgN9iFNKMEv_xsKJXlcakVXHPqhGxbhL6q7EJwLO3Cl3546aHBVxkSzNRQLYIP6uSlcDkuWLozcJzZUsF.n0oW3_krZendKBHFTAiRbjf4YlIkBEuwYqkmWSD77qRhYjnOiZTq8ELzDzKxumiLGzYrhJY3WWvEdNNuGOimS9R5FarOtVADfvZCg_2auClPkTutn9E1sbiTMsaKBmVik85H1pcLqNmIVpZr9qeTdk7l.JbKcV2rzTOtt9rYF.Zl9obAya0VRTOmPcPGF1LsNFUSNSUzUWRVHdaKfpSLdBItk1V_.hjUcKJUPHZY46s.xW46b.ZPlIWuUQIX679VFZY45UQ1KIo__AH0HLaD7mKKwSI8KhA9i5DXvHaBDu95wM1neq7AR27w89HAJb54QtiLEO1o.4I5BKCCil.rw0GMPOGrS9ckDnf7Lai.OqS75Q",mdrd: "e7lIM78N.Fug8j6f.fVfZ5LzoWgP0cN_FD.60_IrT6A-1739801764-1.2.1.1-0YI7CfDHH0vGfgFts2Gd6sdi8qe9iyBJ7aRXsFbxa7Ac7b8sXyEd0t_AYeeFCRTfL9kZwMni8SYxQM4MSMFlPEF2B1xAviadjDZSuWXDalVjvYLBgYVfv1khQ6zxuateLso3ZOmlJh1bVPvMKC.OM7MlqjzV2AUF3SsaYMvstS4URiNkBwu1Ik2dwIR9_b7NaID_WZoKGPZUpXWs0u6alnWJxQR5jeW0ZJin7GRFtBRgWjC83rpjpfbVHC07T77XeEhhdJcsjLbjzW0TYjRN7xVk3a3iID0_tLBaWHRjEvjUV8JxBh.ASz0IV.Z2tUI0YRw9WVfFHE1ByOD8iqWiW.JJzSvGWuNWneeKW0AaTkunubR47w5QIC2W_mtiy36usHriYflbu0z8TFbOIkQQymU5aekWH21LTYZwXnzM3bPJo35znMlSGazjOf6TECz1tHQfCOU4dHD6Gr0QR.lOfHs.sVSyNboOsywgUelbYpvWpBHw1eGASXI8fMVpRVU2aSZ.k5YBHohTjuTzF26snFqlhHpx3SIoc7.RMGR0U3zb1sqn8UmUyiibxCSmRrHAsHj_Z7ZaL_q0ATaqSX5cH3Lq8fW6MkRh3cD0Y55pshKigXib9vh_fPppROH0sJxNVN9IJ7gBKYt8I.k_i2oIzCdN3GCtr9MX28MQiVfFICVpOala.Xu5CxAn1rSM0_kfOSNTmtPB2KPvGHJJVZCmH9oZc5V9o9wVyv0bcsMSmd7zdf0oCGyCg2CBaIDblSS1i7_eLJ5iyiIb9Cz9GZkRU8hnC.TRFmRQP01BlhhJ4.QMUBIjp.09YPDCEAmVor7PMDuYdhTTY5.d0ww224jNM6S1cV_aTlNEioLfKUFVOaL8n1fiANHj7im5vb3di1kbe3WKtnFB0DLEquzfmnnmauhKViuIFea0Cmsn8lfx6V_O73ePKzG1J9085KnpREHCWP93uc_W3csxh9oScb2XSkdxWv5hDAkJ0EIcs.cRK5umcKOhCy.1QJv_o6t2p34mRWIQJJLnQ9n4ge7C8JLK8rdsMs.9LaVk4kBduqPqgD.GbeXBpnE9.dWgOrdhGiog.YFxtWk9RysECaVUbAAL2JuFFSUqyGNKdXOnoIuw6h2_hCI2WlYaPGps6rP1_omU1wdwYdKE14VG.z.zyJTIl2O8EmuazaVFUnQIMiQ369vbcAUo0AyECRuiUedsRuF0HY3vhuKLU6GVrgc_wXwL77fnjO2Cq.6G.GVR9Mwme0aTRB3_4CcWHByOtOjDvPSe9okca6ebnXUnuXY.vjo0oxXXsW.sTK3DkDznlbEjtiMjOVKY4LCR6xHTzMP23OQDt0D_NCUmggXv4Sd.iDKY2Ovr1lnwF0Ble4S2XKFXPgA_edfLQ0vpMUZwz_Fgfm5ht7GQU9_AEFxf4jUE5GR4xZRfGsIPbinza01dxmwL.IRrGSmHBIJuGp9PtZC5joJzqK7xD6EjTm.lmm1GXz6Z6nxXkdCpa4z1bBci0GgTfh6jSTlfHcTn6DOOiZH1EZY9IcYKiVJJ.hWpyXY.7ruPk14oMjF62eYE6AU7rhgges_16wnzbOIJwGouNBQEGyzhmG_GROvCxbroI2dwTLI105qXCxj6Ez_iWYMfHaTZVOdih9.fmQbZFF.WSVG7MYf1YL6p4hrtS4krimoxUNtTWA9BEAEZESyxIC69F6mWgfWA8NAyTvRyFkcP7zs60R_6pmk4.flzzn65OpvGNtTYvt2Gt2Hx8yppny2cDKZe4cTbMno13O7Z_I_zVkqY5keblaHS6s4lW9abc7NsWivO0aFGwO4gGkngTyM7v_rr7.chvSJ4harqQ3W5bVCpDu2EfuxE1.2mZV.Wkxzlu4nQjrcjW4wsDsn6yTD04w7QNEZtTLCruZCfFN_AgM0Ve5w4d7yJCoKMgoU5KzSMgEXvisFxKc7kqqD97y02neH5px07cQCBmutNWfn9K7c9g4X2Em21ykD1ZBIwBDGfHdpfgw"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=913664a2f94940aa';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, "\/5238.pdf?__cf_chl_rt_tk=7zcTN3T3AMgnkc3GfCMSHEp6ukYEPwzcVp0rSLEAh5A-1739801764-1.0.1.1-dTfse8Zj1D9UbxJMugowjb57c84BsJXm5C2pcbx7upY" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>