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: '9136ba2b28c181c2',cH: 'esl2OFOF3d8LGgE4o4U2ymD_nxCaEl0rzvEotC0AOvE-1739805267-1.2.1.1-fT0bjmf21zCduL8jDr9Wp2QYWX63zjupow6lkjS2Thoc4dEqiCkG8Pf7eH3tLR4Q',cUPMDTk: "\/4098\/bibtex?__cf_chl_tk=8BpFV3zE2kyM.F6jX2Q3R7bF97H0_WW25hzD3EFhziw-1739805267-1.0.1.1-HhRdXjLy8PhR7PPs7JKgjdYatW5ppm1PE9IKMaP1M8E",cFPWv: 'g',cITimeS: '1739805267',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/4098\/bibtex?__cf_chl_f_tk=8BpFV3zE2kyM.F6jX2Q3R7bF97H0_WW25hzD3EFhziw-1739805267-1.0.1.1-HhRdXjLy8PhR7PPs7JKgjdYatW5ppm1PE9IKMaP1M8E",md: "zoifDmcNjn5gXwTC0ygc.9G.NzRfwzX..zxdU1YRc18-1739805267-1.2.1.1-60cu0PYHWAS3eXRY7kUxAx0OyZOIVWEbZ9lmiZEXzuCyZ910wbsyehP8H0vemnaWqR3Jd4Cf89_YHG7rq9g0996tWwB.EfO1xviPJkTuBhct2EGbocmbPQqJoJjVVjO8F.S0L7CZ2EXNkqO5dwL3ZTCrrx03hByVy3AI7QIqjQ57gM8C13PWQTsSJNP2My3WYIYNBo8_gD80jvuTUndEirnD8ThmpjkTtR1p8Iz_iJFuelOG0driA8IIrcN2sCpv.CGmUXiYGX9ad_Cd7dSYx_cogfhdROVQhcpUQTlDe.mpaE8NimwFb0v0WAehrEaC00Z4_yLRQoHILrLOhs9dztwFnW_3eZ4Jf7IkoEvNui4firsuq72p6Sprm9V.e5PnTHgwqp3GQXCv.4ZGiXvu3Op3EwKZL36gG33ZiU4UFGL3GcR2dxWJHiMJ8xC7u9JbStEPUhpkzuHL3Rs2LzGINUCh42ihdAFSEHtpD21VGuAyx6YkAaiAQDVNTxqixoqkSWMf1pg1ovlduPOq_i_1Z85SdHx0b.hxfgmsllTnUm9NDd5W7hYkDdpOjSOlOYsdqodYzXP3cMe_wwHjbJ3Wq8myhB6TYn3m15oCrHO8UuRsxL5GMjzA_dDMEb3K1Yk85vtF0ngIVThotfey0bjciesyIn3C.tYoP_Q9fb_6EyCdAeJIlia8cdFpJNSQK2Ng4C20j8HpBgPDqcUdyjf.JV_JsdA.J20th0tHZR6F6DiRjaV9ZXtVyl9EywrvjsVWTs9nnZuGGL54Q.UL82lakl0oXeze5uwYk1KBc7egDLN9fE.nhGWGFaXrh_qSQxayDNz7BAdMupR_FZZIg6T4NXHt5GO1FOnCOiVL6yQKhBQ1tNquWVWK684NOzEqWd54CBqMl.Eh1SmVyvfDq4Qnj4OIjHIJSzJ.2_yBYILr5pfabTEj5q2D092XJwhhi.o9Nc14hNxY_3OJe8YXmXf9kg0wMTKgOIeXfXAhRc_.dudUp291l2wzEYTxHr3XwxZxOoMZQRex0T8IzfpukEjrYsbd2wsZcK1Rs5Rh4nVYHEjkqB9g5fo6PXZx2rmUTLobQ08Br4XqpLfEink9QjuVPg2mxF4S3Rf2I_scNVnLqchZpBREPsvGTYCPY7Diio6H3pHdGK.vQjRE_a_ajJdZl9J5EX1MkVI02eVw17M4688WHa2g6KVFrEaiFh9xLIZbuPloGVj5kYU6mG6E4gaHldSv6mOlsaR94NrBpZ12k1R.BHoZWBv0fX4K5LBE11_rKD9Evlc3MDhXTeJA85UpmkEnWb.lSS2Jq6V0S389w8QJOCmVjpSLRcfzj8kxK3JIkVIGu1gXQNe8h3YDfOcyYG31ryXpyqQqDxlJd.d5I8JO7tCjD8xiZtTY3NH6cytQXOZ2V9k7oV2Cq2mQRDZYHMr5SjE3tsVRrfhKehiIcfGPdqh9NnYlPAHPZcUVoDORlD67D1GjSLwD7QKn2kQHTgc1ijFS6K_Z4x9BNXq_D6R06xOkZWb0fHmGicH1Z1NorKpxIeh0MUYOkOV38EhHFqk01xerLCGdv6zCciRFqHPLFSudXoDIwBFECc3aypdUH1gjUC1yDWOd7KFl15bU9e3m7FwufLTD2v4G4pp63I5ZHRaXLitKqO4ZsAbA9.Ggf9ug6q3jvbxj_kUNM6y79FIf4nQD8JBKuJDc2e4Vr69VB7psNDXLTTVYmY3Cbzch2C0MExA5RDBe8tCC4JK3v5kFxWkr6P5H345FR9HlK.XP6ApHX7gd6y4_atgn3SLZINlnAdrwTPO6RNY.B8rEXKQuoJkzrMkLax5x9cU5Bg0HyVFFvAThAFdAxq1myQszYFRJ6mH2AXcIbQDJm0q1kjnPTBF4GRpBpfL966wWhlA",mdrd: "QcmFP7helnEKhwzJbTtBl8hbLKMebgIiMDei.Yw94Nk-1739805267-1.2.1.1-hwN3RwdydabFMDFImtqBOQEscWmg0tGjSu_W1FHTd.jO4MZqUD7HMZP.UGLnLmBpx82dU6ILG1rpfQ6Cw5sCGlS8NOnnajyfkn8rFXVBvX8ImbywBOGxGNiQhpBk9xGlgCQSBXD9tX5BDb_oxrIHFSxJkewLRGXOv91pmYN7A1IZQlm24tcf3WFrae0Nk0fq645ibeafkQL4IgQmZFHhYqRDOKR93iM1nf0tvV7v2XPaf5YfnicgSH0vqptnqtNmBWmGSqmxWHlULVEUGLJnsktJqsl8gO6rKc19kHk3qAxKs87TSrihsWLf_I0kxRoAOgFFyU7ruBk8j13_HuGYRBLx8gVlXQOaf7VAAD0hykg6vX11Dr9.PvGmhzgzOCZEifUn0bLqgs7ve4i7j0BpelWh6bJ3G.Tl7FDGIqBXKPDS1AJaz1EfD7ol_wT.DEBMJRpMplG0rZbKbbYgwdUvU1h_SChBFFbDc4fWR25gQ8KtgE6ki0_KTqAfRxXsKzXsEXdsBuKVqzwUhN2B2_GWbH7tEMr5dboamz7LEhSIVHDNFB3.OuCyrZbVsW3oEZI4M6e.g4FRFKj0xk.Ruj8BgyHf28_vYR7_KTGan8ORHnPYA9QfwFddmSl_SsgPB_vvyyM_ZAX7hxJVmo9.7FJxT8UoRvqgt.I4b.vUTUWeEG_Oi443ZJ83SyFMg5c9xUAVk4NWxa2avqXmFSnbBhTPxW6dhLj.IhPgbk0J1hTCbD0sy_Ue2aCTkdiz06GNHzbLy6hGgDqUK5.CukAjisPx7CV_D593Qoq8.E8TKlahlIaVE08fmE.VyRH5xnTOTo0yhxvUtJ8vzEJZJpoOFllkMtttFuXmdXQ7cA0BgUsyDAw1_pQocOqtrgZzgUd1y9iivNZ1UIT0K_AZqfh_xoVy8ttD45hF8KkT1qGYBGIn_CX_MgxuClzaplsjlxyJ0X8O6IZZidj0NgElCnABUWcg8h6iF1M2VjcMB1zF54XKKGQ4hxhHvQy7XIK_9xgMGVWt6PxMDruiDVCZQH0ewTpJa4pPihAUvlzBTzER4.NXsbYjWNursAHLLGkCP00fm13wZpogA7w4I9uZlvon5.LC.3oZYcBpUw1VsUP2wTYaMY4tR.F_K_VpvxkQGkLpPdZ1PK0wnmB1JjzCxf7FxjVKVgyKhjgZdaxGoiFfrYdZTICj087i1ohhl01QwhkD1cF3WNbd562VVNQV9t3dItbazEnUqiBRE5JmGKQHLkkaPD.6INhOxIBybWxVRs2aG2VldbvWoYaLiPXrlv6jjU1gwn9qmfT09NzM8XxdLLDNzfAS5F9PGBLWlhw8Xk5QnJsuYUyy_YEj1hAOzq9uTVX9TYOmDX.1hyzLuvNYSL9AqkZNUWpD5g6b7NHwzTmiP.xsDM863JzopGQ36zbGfM9e.eBLupfwpTZ0k_4kVASR7rcgIR23s3k9.hBIRF6HIlg.oZCKoTCtBFDEtbeJYlOBPF7Okc26nojJpsSnojlGglWURLGMdLsvUgOJBMH4FkcJ9lTGlYvoTFiDTXjFZoI1d0gN6K96tYSpjMObYJevmkrKBwjlsdAJjSgq3n2cUcaTUDYPovaNNf2rnorDKzul_baIA.k.4S7ZRhLaIQRutmqwt1QJrGgTIpLZIAZuJ75ttE8L8IXcDgkyWHit4dYb8sSgoXbthgwwUmogaFcPg21_o4SRRwC6gsrEGvqgLnPo_kmQgOVRz3xOa3safnssRgV4zBtseV9FwVbBlgbUmijH4OQ2rOeKFJioVIm1HCK1dO4mO0Ytk867LT97T247ZpQEhZ5wAh_bCrb2pGLGGfonavovZjOrUteqHNYuSIAL2Unrym8mDIrpRY235UWnz8N8lviZ08KXWT4UKSyT1IJ6_utM1ZXqcxXNs4tvUWvBvxA0VQ04FZyYBgkg6LzR03W.8Vl4VVGFY7bHpa.v3T6_8XW1GZAIHwqLp_cfhcIcih3lnDOe_mkS_x9fJSqx7A"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=9136ba2b28c181c2';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, "\/4098\/bibtex?__cf_chl_rt_tk=8BpFV3zE2kyM.F6jX2Q3R7bF97H0_WW25hzD3EFhziw-1739805267-1.0.1.1-HhRdXjLy8PhR7PPs7JKgjdYatW5ppm1PE9IKMaP1M8E" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>