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: '91341d99cf00fd9a',cH: 'm31MQ4e.D3vnLPQjhE4DMSZall10eZJgyl0kNRibypQ-1739777883-1.2.1.1-jne7mrhQT3Uh8CUL.k18EP_kd0aklczgGAX5xupL.rmsvEqsIXD1c4ixu3t90ryV',cUPMDTk: "\/12305\/ris?__cf_chl_tk=P9BpZNzxNsecXmwR_hs_vG1HiDqQ4N5TEXtUS.3sNHk-1739777883-1.0.1.1-iIQIF_aS5_t_uCwtbeMzSCx.RXwIs.HXvl8HSPFyA4Y",cFPWv: 'b',cITimeS: '1739777883',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/12305\/ris?__cf_chl_f_tk=P9BpZNzxNsecXmwR_hs_vG1HiDqQ4N5TEXtUS.3sNHk-1739777883-1.0.1.1-iIQIF_aS5_t_uCwtbeMzSCx.RXwIs.HXvl8HSPFyA4Y",md: "cz9_FD5hj3uHiXOyprDTlt7ciqGcAChIEUOdtc091xc-1739777883-1.2.1.1-yLLkEQwuVNUyowYP2xMvx3f3Hp.BZ0LVM39F_84rPcxPzPNPQzsQs3e6amYiJkteNlf2n1GeoSNlexJEIq1zBjOWMgj7.NFmG9pPqYWY95kYkjKGnI86TM3Qk2v_B2xNMUna4h2OyWn1xF5WS7wokLDFcwMJcrUnT6egmRMcl3g40BRflpaecTYfzQRelvL6LEsTizZLw2o9UF1X5zEShyWdi0UR25nW7xTjKQ.va.kNOQlW231qXdh8MCrqp9RTMqIBjzb3.RviUZQH2h8vCI2mXJS.o71NklwAcJNzWUEozRIOOGgyLsz8mKmlXUioX2BtPfFCfnqlUzFyV35F_aHHIjIxbfH6CqdON9DL2b4Q6mc1nhX74Jl5Jor77f2h4lRzdZ1mGPHoAcUvAYhMdT0E4gi8W5JOx_Bkky3Uq9L6oFOkEXyBEADCacPi6IlBOj4IL1yn3Wu9MqCf2Rvj161CGV9I_uiEHX5safLjctxnJnC8G1PXY06DA5N0FNvSus_G_On5f7Up.Kwifw8R_6bOEbENpMhRq9Ip7r6yNgSWGtA58GDTVbN93c0c2_jKn0w_2DBXw.2dQF4VSELxJ4N3L7m8h9upWbQpzN3BWst8nh1PNtcKXyJ1sVeCVS9E0anabt4bMMk2PLH0A2Ztl_tSGKk0j05wvT0vJfltyv582VWzgXP9CExf60sZekCpw7DalmUDY6t6CQe5pX05tylCL9HzjlDkfgBy5WJwj6xiwQmP17sPh8bmTv5RXgV2Fmr5sQwMYcWLHrf4EIiy4jZ7V8iMVeuL6EJJviza3KAGvJw18tbLt0izPnP5fzJA57Fb6ibGVuNUNQB2g3eE0d7SBhRDEkBJdKwp_gs1lSF9m.ln8iLQWkxc3DUCmoqTnzIsv6yYw1J9dLNUYfGNkm7keC0YW2UMEsNAoLvBT0JxfxWDCLwybHuSNIntKMz87B0_jrSUD3dkVF732QY1zFJhFgx0lvJr6JklYFdRhBGqRZiD_bzRvVPKo4V2lxEL0siDWwJBn9LOHUPwDi7nwECw7UXpZd.e8KyhUvGmkF5N95k.DtgAWLunAqwhKdiTbKRzdQT_f4.fMahZYGQ3lb0MslOPYGx9AfJXtQT68YIqYGepCotxo4Hx5BB1yZJ.Mi3DwjJTOrDWgx1HNoJ66T.Jjb8aUqFwTlblZ6gTTWcCFMYM5JDljHEBBEXx79q3Zbye76GFGxKXItgk.oTuwN.uPnKKiXTN8ff2SNSsgacJOXhxbydw3D3QCanvy.VFg7xb0HquR2kadoQdO14IA7wGPOaXNxLSaWEnILsb66hwfFkM3Fe7HM9W6TQjHtLq8hnthw7Upum7b1GKUfxtvcoY4FsmyJ65yUxjbwetvGLogrBFpszN4VfH8NhGc5r7CLPM3lc574ESi6n5Y6YazgtTnAb_C_5pAERG001zu4w1w523_jsd3ihxGEJp7I6Zfz2IpN0FfPy1uet9eJD9HOqR63YmrZuqWYbbNvKpSuuXBxRz1QWgDMeRI..BnAiHn0bd6kv.Hi2NmD2_lbyQItp9DGSTOK06.1ilNeccfIWHA6tpNpEWXxZK0wp3lSfbld1BJ8gH9Y65CVBePplEgCoeZBXOoCqD2vXq_HdFCJO_xCcN7J4BNnZzueHa.L9cVRIBlO1zQLkY5sSLLRGLeOuLrns8UXwSKXeAnbs41ghwgaPyK7HTT8.0zpdz_r1EmYG.38mb4B_tm9h3VngfF2dVTGZ5_mZAgWaFWmbQ4Ok7QSh4ESu8qB06rW2buUqbew5.17VSxTiijHaM..GYNfa7Wram8mfEtBHF1ZCwYflZ7.mlgpj2Hbh7Z.aAtMrqPPqCDko0saQ7g5BNcSDo0txnyTNvFw7iupdsOyq78.g",mdrd: "jjZgCJ6yQ849Ca9eghMAvcYFeI5f.vOTw1cH8.pkt.Y-1739777883-1.2.1.1-N3ogiOrFaL_MiRDP_IimYck9.5ErIAj9USD7eWR1.IFDe8tiApjXHzi.VmZogPuFbnQV1EUYMSvPyHrltI.6QYs9K6ObjPBThoT8GMvqFS81tJCmUHvJmwLrPOyjD.62BrTbipUFgEgSG9vPLeKv_ghGU2CsHbcBXD.5RzVXnOiN2AiVCIRsSbd6RmrWszIVuzxpc_F.FNyzQ_SzuZjGyFdlOVzAc9KK34ApdSlqMUByNV7uYVUH7u5IkuP0FhnRILtU7NO5nDFmbotmMmBhQNuzM_dcxP1y9bsf3ksyLnvehiEuteGzdt1mn_VbjcUwlY.IaRqEFikOu7mUSbFBqn9sCj3GEPcA9Di2B5U9m.0gG7eGhZebDJGrYY7.jV.wFrLeIgKS8yNavWhU8I9ZhKMl_ik1JPmQiWMtFR9pEdZ1fXFisePDmBFK95QOIUizncXFXVh9wlXZD5LeOyjJrxSJa2i2qlx9RBfhj8p4OcHW7garSWM3mFExYmdSal7dvXVW6.3gqQ0RUxUSyyd8to3no_h_KTUFhV.uQfZ0tq4ZL0JMyKezy.CrC8x46k5mcgiGku1490lSFv1iEeYoM7XQDqrZbMRe2AqYIDQMI1HazU5KNdJdYObQkE9MGBFDt_Pg0whRcYex_hJ5uPQs5fg1p5LsUwahFrZUV2UFUFFaRbt8yQ5D2tF1RVqXecTXnpEdLiotl3Gub_50qjDQ6iOGe8H7b6c2pXnJvtzUPViCz1yaM39X.nQBAnEE6ypiRckF325kVhHM_dQHuG2o_t7BCM8EU3Soq65JhVfIVopTv3AHiWjhM6XtpxVV8jL9tvEuTXF4pYPqmv4_cRBFBZE3fTKe0HHwc2Y.eNqCdbSu1XWSGD5dbcTzEZh437pk66CdeuGsQ7P8zPWjnHFxzlnftuobhMoFw7uscinEoNiw0vJOL6Qlf1oOV6ssYtnukGneNNQESLYDR4Z3Xurum8IR0s6dXQlwPPiaqC3CRtf4fNmSA8HVy2KTwlNOcO82p5c_LSYqSCSc7_.RHNdsBufXK3.ZtgA4ZZLBJo_FPqe8MTsG.joISZtGukx2KX8kuyCWkfuVI3EpsfmVPhZ_OF95iunS2y4Vn.GGcN3fPrjfzlUTEl1w8je0md9XETs2aSH3zYdxo89o1Gb6OD2P4L2rn0JdIEXdNpA8wZoEUrMc_oPFdnM5ZPqPSKVJ9d67P075JH.O4dODnQkrFLCTzATFyK2g36O2d8QhR69c4l.N4tGKSvEdaqijMXzziSBW1_nbi.fFq5EfJMX.gVpayh5TG.IMeGs_LBgQofev_GgCZUj2Ewh6z4kGeSxggoqDAuJ3_H0tqgzCcrctxMgChFth_TSIofXI6vS89YLjVxuLI3tt4KIn1jcNoxQy1dLr.5FTb.6lTXc73WAB0n3lfnJOrxoRE2nc5CIwk6NUle7ibbC9DlpJ0RN76nqk1jOcN3fPRdMUSqGJqqORRmcH6UPmXsntqhN2VDZU4pwyZDyKpIuKlkHYLTP9.L3j5t3jvKRrTpnTLorI.eGnBsFtQVp2E85mRypNsuiqTh52pbSNdHlwl2bqoM7Ijj9Lb64kOoKwkn7N2vuMKZxgoSUza96zm2AA7qGZvx74jOgx5xihT._cIBPxvBbpkePBOzzUCGaVHBSWvNuf_TTVDAemjXSEZgqw5a6VLLIQjbrlPo3yUsO3nXYZM8hVQhKbz7umSv1BpwfKL7BE.oMko9cp.6gXUJgZQlxlUB8eJC_iJ8TcXHuFudJvp9iLYoXK7xYDzEGsWF5SG0RQtn452WlAbyLFRqvz5yKer7gwstaEcl5cmxnY0FgRzFZgOvNEo8dDZci9SPgzrAHSANDt1aWMgLHj.Wvqp.Z40k8J54Oh1Zpd2n2L8uIg0OpCusLdHwyBapUAFf3Nqcky72k3UhzUu4mLP1KgFvv7kJulaYQmjk0aJS3gaNJj_.tI9Tvqlm6A"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=91341d99cf00fd9a';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, "\/12305\/ris?__cf_chl_rt_tk=P9BpZNzxNsecXmwR_hs_vG1HiDqQ4N5TEXtUS.3sNHk-1739777883-1.0.1.1-iIQIF_aS5_t_uCwtbeMzSCx.RXwIs.HXvl8HSPFyA4Y" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>