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: '91341a6a5ce5ce1e',cH: 'C8Vg348L2czlZ.utMX1_GZI2MSH_zWAVKDvDDUEpUdM-1739777752-1.2.1.1-Jj7_ADc6BzfV3N2Q4XDDKriNchl6_x3H2XWZwELo8rj6Ctre_5vQ5ouJx_0zyUKY',cUPMDTk: "\/10006405\/iso690?__cf_chl_tk=76WVJhbmPgR.qBySH653HTHN7_VHK0cweFLfCfkfLzc-1739777752-1.0.1.1-xpDiwqixLtYWCjSwRIpumfoB8CqI_abSp2P_hju.1L4",cFPWv: 'b',cITimeS: '1739777752',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/10006405\/iso690?__cf_chl_f_tk=76WVJhbmPgR.qBySH653HTHN7_VHK0cweFLfCfkfLzc-1739777752-1.0.1.1-xpDiwqixLtYWCjSwRIpumfoB8CqI_abSp2P_hju.1L4",md: "KnlqYgmYjpF6L2VPSc_g7N1XWhYPvPZIP7LfReBp.yQ-1739777752-1.2.1.1-QR3EuzEHtpAolsQo1iUJQer4EKLezmUGwzKmiY40RBPN1WyCmYikZyfFbtUlAmu_7wGE7HCyO4ROrbTaHZHpYMKKMTDUuHbdIrohIOFvY1sit2UmvDvIaihMbj3OXCYxSmnly6AANHI81kJj30k5Ga9_CwelE9n2v6iGKs_qUzOgBR4naFVzam3YS4RCbZXv10hbcJ6LxvnmF1veKjZRwW3z9uGf8XBgesakFBKoy5gmsQDBKK7azz4aYx7KoQHe8R6Nj17k_r5NutV2vfcrQAtG6wGUpdQIOeuGKlKhDVf0CyuM09F.XaxF5PWknJ2jLuQzJe1vxtDSnSyqd2GNkQvRmjD9QFI2Cm.oPQhPP7HVVP.mfTv3nKPTWknja2ZRya7Bvrd7xzNl6RVxAm2XWGX1706vkA_eZrGrm2d3HyDYftgHj0gsB1Ech7wHb4uo_ecqV73DLjNqFzJej2MxB7pJ17Em4xSoBRhkNFqdMeFW8oQMF6b.cqwKT1Yfw9CCrFL2iTSFos83q_ph.NgFAFKt4S9X3L4fGFUevsdM.Cc6v6ZDPzSK9z9CNeBUPPIgf5l21er0cTe_IuPbKn0fRKuObGi87B_FhF4c4yTjHjNSOKvItlTaalsOLmTQBpy9FXJJWtLIu2JslK9fV5tNLyauwEeqbZ4HxVrqy1NJhmkWZ02Gt_IZvz4t.tvjyjtPhmZ.5AO2.XDUPyMhYU5lv5xyiiNWsg23x4l1ZMWvzhmoFloentbek8qImZ1.dy.hgmw4EZ5s5XldcGBpDR5Ni67lKbf_AF28LjE9jZ.UIrHbwRlJROAPIkzY7or7t51ivDXy4BnDWz3..QMLYN_6AKaErezkcssIkPCfG1y8sSpDBoqTKAjE_dU3Ps6RqKXH5xPkFz395K8pQzRBPBsPloZAwRBgYdZVlrg_IGbHOPAT9_7qt282gx7ofWih4312gnn__eDkyj9SQwaxPuRGPJbEGQDa6zuSNw_tLICejDAKfZeQSucmxV5nlHBqkORORrDx8N8yar_OM_VM_HbZlrnXA.N1TefTd_K.7xrF7jEG5rOR2xWsHcbWyF.vKISmBWhpG06flz1kgVzXkz1PnpbmLaynxqkdXyyImK1duV4J76LFBYXUVA1Qzq5oPknhUX8ioM.s94K3T6FCE7EKGJYRr.XDPjVrpoIN6IZpzsJSJllJE3M2MZ4sfrC4PZA.a.N0jQGfv342h0a0nu3jooalCK9LVUjxDEsdW0VtvvMb1.BJIgsF1yDBPge_br69Qn4Ff9wxxBoKvrK5mhwziA2JrNrLeJ.Nbf411HjeOMXfB65WN92LqVJw9xgtsMS202rO2cuZKGYy9O9vBBwlcXmrGUNnYn.XVwrhFZ5ASsDgt6ap0fziSkggsNMA8eJ0J.vAoSYLDBQ0gkYPot1rqdhIYHsxJLeFQf_opNOWGmX3zQMB3bRLVa4DfYe52Kj85o._pL82wyqIbACyLzwEAJ.hyCKkUNR4UWrIPIXaQdxLvdE_X8WNJH7qKL6qdWyyYZx.t1GioPAKLe4gRSkRo.JoJ0bj87ulI4UfcSqxWggd4SobD11QyugKprz7kT8sfaFIGhfYoRLyVFG5Sxe5OTUfsav6K22Pv5NNKSj61Nl3j14YK37gN88sK_PqClY8my10Zr1r7fZKSEajx3mWRmmCCpVgwFfq_IHbAs9pJDS7FsVkjpsWaNZm6QGxM8XKx2qAt6n6K9LRLFA3v1KIYBbHNjGUaa_FNE7CQrX4XGn5Reb94xsII87eQ3O.OXDnbLItQWoTJBIfu6Br_IeLS.1esOHk9xt3cLJP2LZGFTH_WwYnEaOsZLXpXA1kqNYT8F2zpC9nUp0e0exDP8mhpCUQleljFfXV23SIpYiEupY",mdrd: "P.PX9hoZxwHpYjsxtY5WUw3sN6G.eCWSf.vWKb7EZmg-1739777752-1.2.1.1-BR1n3NEnFMCQd0wTIGMINarrnKcXzKN0H8_cDbQEHXuDeUvXa.oxAYaIhWfdedBfbOJojTIU8LLAecg9gWLUWuZLEQ2Aak0YQrOsSxDM07P9Ma5avKgKH7PQgcfQT5EElWWfcA0sb9SBPibDO9vspEz5gaFwIECQ1syX.IAtRQtfqnsT4hCKSrcruz775UPs9q.fEJTqq.S_ZKcMPOw0wvrEdJpIxszljklIzJ_w0ODHr3XtcxREt_FbbyOQ7kkmAFov63EmjhbbbWWkkfQ3qsRWkZo4n.AEpdBxytzWf5qMTBEk7n.GWoiG2BFFxtl3NNAv00L.xuitL6fydcLgABUy.S7BzWCs2k9AoPvgbK84wkQ9GLy61WmI415_WXTLpvDkRkbj9MC_hZxN7atpO99GADuwnLLIVCnFF.NbGo1M_4XNYD3rx8OmnltRts3V.l0uRVQgp9tcN3BmC6opPuv3kLXcyM2scjLLjiwIlSXAyKLBmjwzYER6GjV78yvxL8VBgJTKTH8fecyDf3Ka1SfAtIE2x7yUkxlWGK6H6WsJCZFcLOwVXVQXfASP6ji7QbXzv_rLPm4RCJQrM1p.91dS6gEDXE.7n6pQOgbOFcXQgxzC_iEUG5Lwv6zXA3i92LHbzHRyF5SXeg6c.Ra3gsPghmE2NH2Uv0QQNRyb.Lvu3LC5czIQSWfBdpDA0lWkdhNFkQR2vAYseiHJ5nOBYWXhYFuJW.UiGuIHvLoUocJqtZaBbwd6Bn3gHmM.IEJM3GE3BlwDOn0YXHjYGV2o.lVY.HPC3GugZEFrkCUVvUNL1f0vInTy7tDai6NrlU6FhMh9lJC8oboVu1IfT1N1GnPJhH.BcdfDz6rbxJiMT48KcDlQjsYayTIkNbgPb4zAQaAiOS0oqcVI2exVP37SdwJLRCOCFD_BsbeG1hyNfVhy9nEG6lqzUPY5jq6ii.Vi7LiqEKDpeqOD4hYO6ShL1zc2ktzrBfuf.7DaM6adh7CPyNsDM86AkdwRwq36ysYiKoDMhaZfidPl73OWCPYZ3WVyunW5FTDgZU2lYeLupBipaYl5g7sgBVdObXecFGiWVtwqYg.BZIuhGVORqPd_KdDuPRDVy27MH9lHg870mg.91HWe203xAeWAtaEOyBgITtQb2wrrn3Bl69zDAEHkONOAGbKP5VBvdiYtUwwrAfMoYmkRXO.hU3.nLuAiZ2Qzscj5qRwnbzYBF0griTVay4OfqjWAAmLMmebo3oTUoHZPfqKAiqPIzkuJVGawLoi8wLeLEk6qwU.9ac5lp74E02yBKUvE7yyWD2pufxNRrNOjKBhfyz5iSwzBQVdSlBzZNE8jBciLXd2l7fRqmjdCAtBRexTKPbjM_yL1rbsBwG0O5Ul4XcKrDofXadt4h0P8qJiG5A.aZ0Jm8_SX7UUgMgj6UsHEmVzZra0S8U.4qe1DHqBjz59EbubTTLaVVcZl7Ge5A9JpGDI2br9T.DIH_bghyENEYjaiDLrrd9JpyEyEab_dzlc3hB_Rp5jg6agVpJG7LFIE2F.xk39kfJqAsspAcdgukuZd6KuK1hISP9G3pos5LftuedFRnDUOvzW9Fkza4CDmNaGqvB0yfnAo.xbKaTR_JPtiHPP28iYxGZaeSb24jTP2OlVWfhqM0Z.GvC44.ZmMmh4VEqXH0KRFezUr4on2KrD_iLpBSdOfHNjDFHebI0GbExyy4FMZlFQxD5ifyBmfivicXM5Pufzyccp8fiss76B7wlBOh6RVk7T3fqa39ys6T3db41jkJSjFnsgaEmrQt85PZBk95CFYm5UsdlQ5mNkgmAIiVpsxZp2fZPtaKcpD1d3LRMKjWDmTGPCTlS6LB13wTUa9Ho0aYEjAAdmQFyPB4Fu3G8z0HzloQIRBxR45CHh_tAmmOtAjO0SldHYsxKveMi4sUfhg7Nmrva0oTWIEqGGMLvPXI3Q2bGb7VR3.BFETIYe1FfOY2jN0j6te3BvcvnXQ.Yr6pw"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=91341a6a5ce5ce1e';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, "\/10006405\/iso690?__cf_chl_rt_tk=76WVJhbmPgR.qBySH653HTHN7_VHK0cweFLfCfkfLzc-1739777752-1.0.1.1-xpDiwqixLtYWCjSwRIpumfoB8CqI_abSp2P_hju.1L4" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>