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: '9134bec98f0da042',cH: 'mVN30DGqIy7fh7qP8F_bQGctiDJDC2VJGSudQnwExTE-1739784485-1.2.1.1-AKXfIWqr3T6WPshdBbB1IlfTAQmewIWok2ezmCPaRWGAJhY.34MpgjhjBS08KCN_',cUPMDTk: "\/14112\/mla?__cf_chl_tk=dmBf63M.zjA.omRLLuyoWulMIsGxHTqq8CawE1CowDM-1739784485-1.0.1.1-4O.2n3JrVk7BIy8PAtDwCoj0jwUXV5TNzlUtTQy3NBY",cFPWv: 'b',cITimeS: '1739784485',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/14112\/mla?__cf_chl_f_tk=dmBf63M.zjA.omRLLuyoWulMIsGxHTqq8CawE1CowDM-1739784485-1.0.1.1-4O.2n3JrVk7BIy8PAtDwCoj0jwUXV5TNzlUtTQy3NBY",md: "tTqq3YH9zeY0nsz0r63j13sg7rvriJEUcvgLLWJt87A-1739784485-1.2.1.1-zsAB3FBHbnWdrxEI4hWsfqu.j9ZQGeaAQXuNKMC4UUeKL_yrAgEwn0bxGcdLM69tuKSJJwvL_hLvYbAy3uD07OfSBENU3qfVl0OsAPY0Y7j4b3cuU4HcYEY8R0aYugC1CGFu0MQRNUy4CHcggghAlYTlGYFyPQbGH301xGIPkBXe0BFErgmglMV3v_u4VLsnFaB6qMWTnqjgx6xMrJaN4SifyhtwW9PaP5fyBsEFvO.8uoIKvb4vQuhX6SLa4_uONNJn3RMtdcTmy_VheGMbfj8qt4KXjk0I0nZAoLhb00xJL4EcNIQfJz0AyJUvLF52XXMPFsx9NVmLyfmDe1j1GlLPsjKpx6fsFfVUoWICmNo1ZvBNxRcN_RxixdhsXUhAtyCkn5Ra25bC3ZPYwsndGifrb0xAlojOV6nAN0ZiHapgZO60B2_hZhh8ERCQfc2OjvTiYW.yUur6_XYLC1dBXPA4jwyAZifuzUwWSQTvP9Zn7Jh3SX9ckyqFOFo6Nihr.XimAP8te_QBA6etv6JVpL9ux6PIjORa_hIP6shM2LbhgHqmr6cVXyR27xxMdTI0K0MwZmOzMIPVgRT70Sph_O15SYmufJVcGiTioIP5PAmyLDsquJC400iqnqRRLkMUHaf9DGBspENOvCxZn4.nMMkFuua76P_XXtcH4ozmZ4QRnTuE6rUmq8QZ.oH8t_4q51utYZ7UlQtC_LyAux3YZmzbpnMjUpzMV0FpWUc105zjANSPaZOrf0jjQp_ZAg_ZCKPoOa1y5FzvQhUC5xGjQ3Naz_7tgcoKnjZOo24N4fSnmFQ6LF1xUtYVMuAeis.Y7r6g7hWWQQS.PCbo6nELYyVsgtWFSRtjwFMftL6yEKGpLT.xxcv_ZO9VHNWm6TYAly3arNXr1SVFqGIKbqxiz2oi0yTQDOHOpxvmIbGXZQnMOk4ISztUM9WOKSqS2mjqR16QT.KlFjDBuU4bgrK8DnNhqQAFy6W7koHpPjoo9j2hqLoY8Sle5VJOjuGSXX8PclRQd959URXYmSv1254DLj717i_IJkwiurM6haw1fL14Y2D_QDAnSh_15.a0QOop2LjdM72cItO3QFYmLbGlJdjZcwxHy1sHhPeFo5HGAtev9rXwpGxyT9Qduth8hhLlAm7knbWy0Sp4Py_9CXlxU0pNUZNhRbG3EGGVTzgEr7wesfZNC_BK7gmLACKUZf2CtMYx4Hw7mUTO9iHhkJMn3iVJVcaDSGfhJaJ2ZNGdrP3rPztmwKv1mXfsy.6yfBrz2.l56QA9WJ8EREeJXAH1x01.jNQlrPnXPPlYmdYPISWiE1k0XOdcjVZJTy7b6VZUgyh9pW2X_Do9DqOOKHhuPyd8rICyY4CkXBjRDeHlQocHzRPLXGOpy5RlehyxsBXzVC2NV50LBboekKY4hBvapJ4mKOvTtuMxBWsdHSnrPOiZgaTcTTQeqYCCkGHezWxC2lCdZnO3VwtEcIIO4kVQKAOJ9KwxiN0PmlEmCDmZmfWqzyS2Ho8BWgl_dpXtpVkrsd2mS1TA7hRE3th7URYWsrTPjZ0ycae3HUheuOYWLPv5AjEMerZY82tFZOnbbZ82y493NRir85DI55eJCjcutwFYXXnfMozlcujWipCVpMVy7fTqFZBJE7jlzN4O6Ll94dwT39eD0xDZbxjTKJZLRrQOiBTmBlZT0RjLtvqnSI2idLMPHlenxV_9FOGv2jkzslkbIaNdwT0FnYrehB5JojtdCyfXvhxbdD9K8IikbXhC.jcrtEoSRizsg1AABE4Ge7Hx5b6KoheeOTpqWP9yEY6CA0Ubm54WkyJt0bw5WafvVH2KUtEXfuzSX_NA5dkSdBM_t1I_yp70sBnRv_IExYaM5ZfBcYFB3cxzX7sMzi4",mdrd: "ZS1uG_XCetBfjIx5cZRt5472bbE.4EGU1BzzpYAj5tM-1739784485-1.2.1.1-SJufwP4AgsRr7LqbkIAm4vH7yBOz4vXs2XcE_ujZGDP_ls01tZnOIO.DjgY27Gf1FS7sh3rHQnHF8wUS7XUT0O4lvTWAYtcZAIhrttbXUJpJEC2xZc9eyYi65.m6VBGoa6g5KGcIOXFbNl16.8CuxBqRT4wqR6xKjDIlIHG9XHGwZ2_b8lttDpcNw32M33RDnEmAlZ8F8onA_O9gBtlOVX4gDFoKZJx1vmfqMpYaAxCUotnNWGfDz5NZAKkz6oRVkbZTdic3fxIX3XZmyZoqR3ZKzziYOGFzVSvBmlZMsMRP0x_aqXUVfWxdTIfd_EY7SDGZAbvVqbd_7l1EcYveoHVyVVtHswiZm99hgeexoHBYKPWbt6sKyyov78_8jXxrtX7QrrSEVbbVQQPutWpvpH515jfKiOLBf7lgKoGqwlNzbYaJ6JULJIVkYD_2B.t8FkrDUo4yAVcI40Lg4a5YfGvimTq8ZG_zh2VsIbF_YZmTLHUOnV8Jj90B57d8wzBpxbUM0u3lql03aUhtOP2ur15Oh_UC_HLf66r8CjzKVG.5mkaKz.._Ng5Xs6ovPBjyc8XAL0MAO3bNXJ3rwGg6xVTf.tXE9hevvDthzsl_8EkiJO_iHQAunTRpU7j35yTQCoDzZokKblMDU3LUXRrSy0MrSj098cwiSNKo1Ysjmx0MW5nkyDRHcnR5.4WUAyjVHY8gGwhDrk6Gy6v7Zz.5O0769AOtm87canyHu1DuDrsXRVpN4fFqlWEAmSXvBj452Ztc12EQxpRCoNkXd6ET_6XNbtfVLfZq9VfxtC9bk1G5aTRtRwf5ftDM_s_71vpsIB9p_HkX5sNjUtvmvpZ82lnjiLeY3uNLCX_vVB7TrlB2B8EG88FFMsNZLMC6ou4gO4x8tCArGLxJ1WLhr7ARy8zcQ_Mnq778kok9JVvlNwMbORyos59KPC_0jjaXE8U6dVIrLh68b2dJ5eJCbMoewqEzLTXlJpXCuaulErDhj2OIbnGFtxZqlqh7s5JuAp742varplw6Wy0ZdfjhBncVLE.QAT4Auv9TKfMoK0y5BmJHJAK.2AQxmKR_zICHFMh9lyETNqOzU1qQfT2qBO8feVBKtCqC6Xqzaj9D50y2S3cYsvEwB4SF8reX1CPgN1uwTzcB7DVDfAIxY1TLRK8r5fz9vTeyLzKsMf9CNzS3lQqIyn6eJPVU9bNPv.FuvMaW_tHuHg8OcLQVr68m2YCnOAg7YsGNk.seelAroVb0lVL0EBp3ov2jclDKIbEC_Smgju.omOTA2ahLPg0pE8ewHjFJnMGYPevgNujW9AhNdtoi__38IatsZ8RTa6r3MbCRPU_eHuaLH30Ahxa9DgkOGa_SpkB8tONeZCHYITQLbxy1TBph_D0WK0bxUATGZBKrLDRxRqHkw.zQl3AT7i0VYLiA7hOB5dIDwAC.NmrsjjwCG3lj1gEPrA4YSPji11XilFzDCZ5LrvAhIMq3WDw7ec9beOZitcVuzYqrjKbq0l5wokKqSBzNHT8xctc3qRI9x_1ZudHCKH_t8QSrJc7l02yVZ6MhWYIS0yvjYu.hyJX4fJv38jFPprxGcAziu14a4HOnhb6UyCJlb_.pox899BVJvNKa_PLZBEqGjpr3h4spFBpd8tZSk4Fs.oaJU61Lgbv4Zli4tQYJSsyMHxt3ScOgEy2sQ7EL7gdyZ8kVKbok4rdo6TnD.7da789lcKHndq8wLDObRRSe8xOdRDdvwxNOQzp_OAaFKgwl89P8dGKwuymACVzuD66d1Cvcy9amErUAsJRmtL9RVl_5j4HrOR0FRDqVRgY8nyAjlLpjPy01gAQqnAjCRi5a278PKj38rcYNsj2ut87pvVbP2t5pVq_q6h2AnIKJPvNX4NoYp9WPlBJkS5hFLTuOuw0Ns.Bieon7QB6AiEYTnJaZt8jsw1G1yd3.0.iu5SYCyTHrTXSj6jF0p5PerUc1pvjYVzg499wyvYArhexbqaZGLNIjIg"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=9134bec98f0da042';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, "\/14112\/mla?__cf_chl_rt_tk=dmBf63M.zjA.omRLLuyoWulMIsGxHTqq8CawE1CowDM-1739784485-1.0.1.1-4O.2n3JrVk7BIy8PAtDwCoj0jwUXV5TNzlUtTQy3NBY" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>