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: '91347461aac0fd96',cH: 'LXd571YtcusLpiH.Yd8tQeYH3D9tSYnFxYpLb6Ee2W4-1739781437-1.2.1.1-Ix5h7LJ7i3Yh5XJiL5Gke1L2sDiZHeJeX_QW7njZ.ZYi6q.kCHFI8TpT5V8hXDid',cUPMDTk: "\/10001640\/iso690?__cf_chl_tk=UOMv5Q.0kZjzkp03FwP5u5qmxiJ8uGNAG_HysQQJIqY-1739781437-1.0.1.1-gzYD2ICfWf9oZJBpQdmwW_8VpKEJPcc1_nG.K95nAeY",cFPWv: 'b',cITimeS: '1739781437',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/10001640\/iso690?__cf_chl_f_tk=UOMv5Q.0kZjzkp03FwP5u5qmxiJ8uGNAG_HysQQJIqY-1739781437-1.0.1.1-gzYD2ICfWf9oZJBpQdmwW_8VpKEJPcc1_nG.K95nAeY",md: "2DTlbul.gHoUxBmEBCosEfI.8N4rxvKn6bBhBYLQ.MM-1739781437-1.2.1.1-uSIbgn_EMP_W1ozfVvq_LkftecDl9FbpWNt.2P_CEVSezJTJtHftqKdAtVsh6Ow4BoI8gaYSPt56hDOqOBuXrU77j8LvVFaL8Fz67iFBBP5Q63dkJcfsRa2fDHhsh2tNi9xkd7eYTjuvy0wGhVcaOvnNAO9DQXy8Cxs5JXDolJAigf1MSTE.33sEOzV3lhuTFbPPH0Dyaw_P1dlyIkGfilIkY7BCfx7eC9fR9upPmn1qGjXE6.jLmC7GpyffS2xAFu2pNHWn7PfFgYZebW0BYpSIAXONAcloZg8Za6GhsvMijSo4M_qtELrJOx1ksiZtSCKYLAqdd7YaFUO1LoXZXTvoTphvC0k0mtPWx0DL1S9qZlg_cKCRf_.S4S4sYtVFfdRKyta4KXp3uBXyGTPx5HRCQxwYI6AFuQ0uWi7LVPk8GQ94_Lwtbq2ZABGqhOh.dOxYqMF6QPMxxVyTGv6BxMlQe8hXtv_24SqFz1kq0UAmB5y0JEdSwHE8XWSHc4V_YA0t7ywiUl5qSVW0enR7M8PKsb5GQH.z1AF7rbMkJAiQ8_RbIw9PyLm0RI2Yxq0HJgj1Xe72ASgNhk8oysjaPhlg6tR0xgdnAGAS4VAi6yxaeDeIUNvtycCwm86RD_HiYz1.gIEQpUx3aryTz4l5oGj8ZYU9aA2ia4rCaBM2AabCGBcvNjj.n4_.4vXcbjbB6ZFuqdOj8c24SDUDi6q99v3Zk0MSOywvU.8AvMh95_NaLmu8g_eVRTqepL7RI7jAGlatXn4uLD2RNKXDOIDuypl656R.uR1kj22zPI4ypRDXTzjzZK5WS26eGd2Fx8YwY0w2U.fdjXQXBJGSd.XLdiwB_RwOSYg3werFoA335O3VaZyCzOuN.Cw6j6Zw5ASevkeUGJ4l4izC0U.GeTTq1VEbe18lYKp8FFn.I5eEcDSf4fQttZMflawJdyCzYtJ2Xx2lWTPNwYGmMwgt4qQ8u8nfc1hJF94Oleg.z6wgdp2fn1srQNBkbg5xQuwb4GMd5i2CAjggFEVxC.jYAhnyFy1R6j9oQimlBNoCyvSF19_8Fr5Wc5dSm7vhdEdRXiDFXZDw0MvGhzWtgU7fUvnUkrjeBJRQF9LUHpbwgXV4xs1nQhF5WQ2RnwafOZ.djgVmesY0pNyuwCv23mCLYMTNvrnZtp6lXT1UzO77R5TRZHjkJ4_eB3xvJll5qu.ppYaGbFCkN8I1W.QT6Me6ogqxZdux5UEu.u2iLob_qn3U6qY7k3AfqhfDUTo86fkhT9xg00d4awuzcaZBGO_3UYeL_YlgfvkG_5Ga79tPW11Hx1AWcxmAHQ1sd4eUJzStQ7MnoApHdJkitdRlMP2diFI4F0zdjuIdSfGQ7HjXNgv48pu9Akzg1xoOuH12veXSPYXDCESx889_NLnwo9FKQvivco22OGUF46p1cHYVt4Lyw5R2hSIukQilz8p_0TqedxgJlmpc8w5F5L763YFOhpx.gkyNK_G2lQ5Q8rgByC88_sNgdEoplPmksRQvqWXWRYnLfJ9DrfOB2PCPx5elQmsltejxkUizMZqEJYgqljMjZSXEwzmDT9kYMJacWZKjFwxFMrx8oDOmFh3arKk7oaVJBw472QRt9qj544U.0Arwa89a8BekGXEyVKySJvuMWOJt0jkewv2Cp_e.5sPo1v7hLchwVr4UbuiDtA4hF79hsKzz9K84_HzOqp8zTuwrpG3NbHRZ9H6UCze8E7g8MYrhlJ.tsDOlqo3GR6aowXVpCGFLKSoCAvQVaxSD6p9e.HuclmgwyEV2Xszq4Nev7L1WQSBzdSmj3Ium1tnZRMGWasQJdkeEmlPbb5YmO_uveixK3KW0ac1weob8k0HgftGXXmaUQISw3CxH46f._N5vSjw",mdrd: "EbXbOxwGEWITb3y4IcS4eTfFdIyepELqTE0sa7_znI4-1739781437-1.2.1.1-te99W4moG1otFufGHXnw9T5SNzEqv6h1DqAS5MNPx9QNaoG1gSpfZ1QUZTuuuF6gWiZyWBn470KlLI2fzr6Z_OewqeqeQYgi_Ws_PN1z.VafYtCx7uc_Llrs7PkfQLVk14m7lBnmdWDPLCl1_kTz4TOgrRtfatzif1EIrEwZaqYlp8Q7O5.r8BohyBgcex8IcempejR8rT9YfLUQW2ieu91tNoIgToHuBYrEw_G5AWzd.BzWePGpAAHBKC0PF1FxNW3m8jGKFVkcCP4RywwYPPOORr7vKYMAW8Jys63a7NLiClvt4bfvh9wuEbAyYfo.VWjnuvLafyC.8aBkfeDwtdJtiHHMyMhJ.C3K8HqvTUXBlN5mSus5nHMWUBaRqowG1CPxhslClhrlOXTlM23Bi4dMHJ_Dsz857cUJk9Dcpe4b7MmJlgx14fA23n.fHx12yysH8gB9Q3NXTQTQS1IJsFXvYO2hhpyiEO8qgKJBjfZc0wo4iejkstqD8f20FYKtGibM5O5qvxpRrKkXZF9bHeukNxzShARlja9lXYFKLEvSJWd8ricMvO5AVzgsWQkX3bNmCd0NdbF6QQ._NeRdIvKfnmV_d86gT5w2PPeDS4MHT_gPg8_8jxl_lZ203Qe4BXRR339TFMJR1DCjp3msFTH0OYl9y9zwbyFJETEZiJrkBs7oKw.7q6mvKciNT1bFyf7YFtrIsFFaNJl2_k3WQejRdnlCEjNO3RBvvaD9U9_sxaalVBlp5XNt7tnwNOjTCpo3EOGeGRkKV7cn5wlFkTTCQvHN1OrqRk4ApK7WOP_CxHV8NvvOSa.Ad5x.Lz.LA5kNM_F748zBLiMzb4Zo5pOOkBQXDpbdUr9sjlKsnTLnFPjMaBKFSOK2JnFrrR6uPksroBBxY.B6tWH7zjE0SERNoUKt2ZArCwUx66FBXaTC05ZcFdPyjhFcb_nQ3VIe9bexQPnUOzM5khKd4UO3CmTTn8O7aJZuaiFsN9lgtBGHt_tISICceRaOx3CVCcdML._Slhr9gORwraMW9H8Mx1NhfmT_Aw5zhwZhLKfb6Spo3mJN4wWg.O6ndpDZ6FxklPUC.X_8Lh1JwMePUmWMXRpJo9SVFA9VEob0KTS5MaEEjY_Xt4g9X0NBQs8LikvjdY5ScbCqO.J7y2VE6lWy6MU2qPK8cAzu8j5h9bwUH_WCgACCBpZH52alqcEN6LVRyDmgGHIPL37wjBQAqqChrhIeoBYIpU34r18ckUpP0DyM1Uc07wzVG5NbXbuRK_JHBgC76J.PFbmbSpjgjWzYJQwJKFIJUKpwds80iMjGCALyTQrKL1tZHZ3sNbFTQN2utAMEjib7RlBl4phisj_bQEhY9sdKQ88xqs3F9xEKKpLYPTN_Q2EnzQoHB_QWx67Av0IJ6WELQaRlsdPGvYQzKmGTmoGNXgJ_502mYgU1BeOWSZ.7km8ijSqGQTlyD4Movwc4.8DEqbs.leAA3nKbv72eBpxvMAPZFFbMK3WsPZ6TqHkosi9kpSLjSwcJJhY8kg0k1wD5M14SkojEwBMNzU3zrjginWDai8TkTUI2P1zHRZLQsxgV4lPNs.NObb.n6sOEhwtk10FM16mC38_ypanU.z29I80An2SZZbmaNIW.tphVP1UnElUr9CK_byi6l.lkmLCe9q2F_kiGmhF9vT.HZOncXZUPZeFmE1yXU.T0ykHrm5RDIPvu1_w_1mGrrSkQJNeMbtexcvMnRr83LvG9X24lUl2OQG88p8.ShsTKeIQdC17EuYe_OWQ13mF5FG5YPjRjyPB7V_CfGwkN_CsJQwuW0cShp3yR2JG7KiQOAWfJrY_UiLFoHe3GrTJxtO5T71z9Bh.RRj8rw2JOWXrABiOIsiM8SHLvF8Ab84XCFFX7g273jU8NM4u7MkVRxjHmsgUdOFNEPIGW56U6EWj6Z2mq0qKq.R_60WTbBt.7lFIh2JqZQVgXQN9D4bbE"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=91347461aac0fd96';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, "\/10001640\/iso690?__cf_chl_rt_tk=UOMv5Q.0kZjzkp03FwP5u5qmxiJ8uGNAG_HysQQJIqY-1739781437-1.0.1.1-gzYD2ICfWf9oZJBpQdmwW_8VpKEJPcc1_nG.K95nAeY" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>