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: '9136b50d5d74fcff',cH: 'UeQ8jK5gkLY8AV3WDhLrkxUmcLzIqiz9sUAlpUluEPI-1739805058-1.2.1.1-POfqCspOMlJ.s8tLBJe67D5hH8I.nRkzM3q_0CRmo_CorMqP5fYy.F_dAp.sjbDv',cUPMDTk: "\/8921\/bibtex?__cf_chl_tk=kd2SoWYxeDsjG2jlK5fpK_6oj1S0e.RRrHL5.oRsPGM-1739805058-1.0.1.1-0kam5sOGgCg4CnDETQQWI3mfG2EOzdBh5Ubw2uwkIEI",cFPWv: 'g',cITimeS: '1739805058',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/8921\/bibtex?__cf_chl_f_tk=kd2SoWYxeDsjG2jlK5fpK_6oj1S0e.RRrHL5.oRsPGM-1739805058-1.0.1.1-0kam5sOGgCg4CnDETQQWI3mfG2EOzdBh5Ubw2uwkIEI",md: "0Ry2B2O_QLFFbDWWHgHneZ4OcGdElz1Kh51qb1JvQ3I-1739805058-1.2.1.1-fPAT8VZZneR4EkBLWiuBGwmW0cbn4I2FkGn7iwUqv9D78ixgB65dWYS2k8xETsZnC8igksOUEZ4MlR4hL048y5F_lvgVjgcCbaMpsOQ3ErTqKwFrzsIXZpamd4TMRPqOnL6lTW6nVVZkgKSFIA8JUJtmv46rCoRCD0GBwOkOgX0__3NBavW9Wlyb6lC_9lUNHK6AAOjpqioyvLNXvRV_cMtuGG8mZqiziWxjnGO7zWMj.GfxZ2xNca1rj7L8NBSOTRhUGI5TqD2YT3y6CDxDtf2wfSrdPwYmiwt7HJgfId04pLteL8ysCLgsTfOTrw6x.9vKEY9wKMrqMWqnWT6BRM4ZW.3QQHKj0vVKDBcnKFiDkvdYtc4ZYj1UoLTPeZyPa9yRhIkjnzt2HPIAQAP63sxtOGda0TLT6AYMWgcV52DtmPIeWUBr.JR.TEdJx8cqZpmNtfrDj4x8jgL6pw9_IK5l.f3qwGGkCFGNPfdjYEKTBO4XiQwMQ9acPUPZMaIfrvtnEmOteV_b7j_dWZZ9HYri4l6zNu.To3jtwauj8K0bUB3kDU5SRSWu.hBhoC1NU65mNbYWzYnoUcJhHcLnbmpII.NLKCMKVoL8s5QmZnwCL_UFdFeB7XkvDd1aiDOmDT1bX58wz1SJJ7T1gsVmfgDDcCrNaTgi9jIFCHvPYUhZNaIvioy6z0ESqW67EB7i7irWb_NMlrXYF_b1XzPNn3kfTKyRthqPWv_9a4MCWEhoHA.3S9u_kSafwNjhniQjlE1B6X2qHuVRma3Fnq_3.HXwo4sRt1AJzXrnmYRXripRZjB1tCMwA254JOX9yZIDg_cz_bdyKzNeGY7F56e60ripPv3jtHkV5dNkkj3cul_DEuarDk0yEwiZzTqhvqf9YJncwhzwxwrzbuJdU0iLo5R6vqPN8uq3krEMaYtB9aWVxe9OgSZ3oPZ7NZ77hqdntnel.MnbAce1gGjGUXuyy1LDkaggA4OF_GTREduuu7V3LQBPAO373uvPokHpcGcQ9XDr1M_Tt6J3Kdbw9oTCy6tVv2_LckTkzqrsnaxtB9tnGKG.cu2tm2wtSY97BJyJZEX8DiojWH8.KSK3uVODUu.pJhY3MII8gi8aNljsqAAXWl7HZJgTvkTfxfIfBLoSOf4AiJaAEFjwejI7dgzcYd01CrNbLw9LHcyUR2Ddp4nvHebsyzgW_DLWd0.DEFeeN.xFGHGsrZLya_dXfyrMfkXtwITmcV3viLfWq1MiuNwRJ2g26pUhqbWQRE_A.BY2kRcI9XYZZesNWv6QSpCKlyJDiAYFbVckU6DIY9YSJrwL5UmYHcKg_Pk3cOBGEoWllbMD5DDdP.LV5gxPpnb5UfyhF1_2rig2VLZiQJ8QxYFvHN5cDIx5IYQ5fZnlCyiDgwxpmJgSDf03Kegg0ftgBof3cYDs6C6WHWhr5KByQLwOUhCoDmSsqjVbMW.WXG9lPafYR2LxDhhku5nDRIAuuUxCuyDCIsX.6XBTISgnx19AoZOYX5vRgfi84TM37NFi8771DyNOWpP1YctokXYv3Yj8xEKLnpwd9pTBnRK10BqEACakVOXTJZwIC2A8ImQvtRMNf5BbL20k._GVMRzHZXhdL0dUE5ZQW9t6ay0jQVJek.6q4A86i62wWxH3dQkudy7f4HWwjaSEuUvuN.4t9DHocA1hnhLe64_t2I5rs0gGCPljG6KMO1lCiR2vCo704nRfojALk4nz_9.rvmVqCdXIXoLmRIwQwEyuNZ7umivNq5d3zQcb0qsFQEw72zkWsiHTHVi2sO4vfxMy39mMeKMf_oimuvZDBvI.roEchKm8QaaaQ4NAxrvOD.RdhYQJHgXq7BmLRrscGydRp05twvd.t25HqCeRk0audZve3IM",mdrd: "wzurzPbhliO0CI_Gi0DFenHRQCMxNwqe8pMlXdHikaU-1739805058-1.2.1.1-ZldWWxNHPFnzpR5m_JScRwqKcHe2vS2XOVG9AuyZZDJ.ZyRNyM65F4nNunhhG6RBCaD2VH4af_oelkNpCEu7QkP_3PZT_FY5j68NsT48riPebdLO8GMFMKBdblq9kqUZlL44zPVQN73Fh5OifDvh8U6pF7fBGdGpYyOHUm74pkK6e9GEdfRFzFMaMFXi7ZGn36CCCD39tWXKr8iJoqavhqwXQHp3JwrncDTfgRUysAQolkmuf8nqpAgSzkqBT.C58azPWxvtft4VMb39RhAOmP9yywGdbJDTpp.CVikqBlLa3UrDmV7XqKhK96dAoYHKTFNgMR2d0WI_CiaiHi_v1nUOSMSJYnRoNTtItsQ8bRgdQyItDRJVtkyhLKBn9CkKwo5ARcYtE8R4hhgEbYSs77jfJADA5q_9A34XubCAx62_Q8HxjhjS7TgKXxP1lX8wcsBanKlEC1f858K950tG_lq_4XWeK3oQqR2XhtxiPbTtoNOhAK378FltTtMGcbi5q_mY_k0mVqx0_x0K5kYiOwejIQAQcgYdRxSu3i6431XnUSvFf.tQs74TC00S75ze.yhfNj091tAf5p.TWjuEMgyEa1xTbaTwWJ0qFHwABLWQS80Ad6293CzL9afCYM1IBRR8PXeRAskxoaXO.YCFju1Kzu2jmRBlxTVzDaxQVIZwDnqCITUiBc7GKFahWFRzbp_aPMF0spHythNGLNy2RpmhPHG3tBS1v_OKnOzPP4CBR_OSqs1BEwTkCnzs1eKMaeKSQzXD96lUoj7Doq2F.6cFEXej21JwWyTMFkRBz21D0JAhZkT_vjChNwUFqVxcqxgK6Ml596v8Sd6yuVVJL0ezbsQzqw5c15TBJokQf8c_.JkCl865KGT7BQk0a2wlCWOX42v71BRoZSSfaSfyR.QRVnr.prGmUjxpcMQM.5VZ.ai6iHhx_a3qsZ7RS0FoDCqaDc4OGRY9R3G1TCdW2.y1o8hNI48UpBPnogu.hOXT2M_5W6sJgwDbRoZNAEMZqycvWVIl.jBJNyRwgDwEa4_mXVrtGZMusst33fGZ82BGb9FX68hoMZ1u9VC_NNoZCCvz6GsTsTSK1hP8X7wPNXzb0Og7AoZDlOQhtO9J_yekIBiX1gL6WLhE4C6pCxbR5weqgGLHIojBIuEZh1WDq46jQDwZ9Rd8wp1Va_CwpCn7bP3MHzAQ8LcOzd0D2twdQ40GlLo7o28AxfeqQ592ipPaP.DTrAy_dFuDlbBpy8R4kFSrk205bb88B8tIZPwy3ycadnYvl72JVhw2HuS_nn7gmBvKElxcFBWzi7neJWgSJz6GcncWb3BhGKLVki7cqAyhj2VTZ.v1XIcAgt1SA9OLUvp0vOXnujK231bZTBn7puDXhemyDQ5UVe_ZBnXpVbNe1SVQ_ECJi9hcx3Ji4WWOjm6YMJPW01.NXwWohsKlinZQAPg.HW0chSIIrXe0CmEWXYgrMN6tX13mWi_t6YGR25ajNXqjPChDMaWI2GXSse4KvGxGArrUvB_X0ZEBJzctdZJZ6ud149yxDrgnKzST3hfedIiifVClo6svcKDav25t7cneglWVPyK2fTMk98tQ_wc.12d2h_8N37yivwHf06mMkorAyx_uQhBuXEJzr0SdiAI6jxuqqyyK0eWNiYPotNBNqaP6dq2U7wxXQJGRt8yDLheUBkufPbuuDxbhO4dIc4SNFJiMTb4B9.KlIUplsvQv_UbmOuQ0rb5QFvEuYzlTiK3lkkMLx8FsF5ruhXWfqLp2LWBfv4NgveHmoac52vp.lxUiAASm_y7LpdRFvvimQcN1FSVXg5Iy0Qg6O_X6vLWkZjbXi7Au6wytlTWms3H3TEmODhiDPetMI8UMDa9yOATc0XJtswga5n6zJGzwXTXFURD.g0Q3vH8ELbi8sEDacy_2pCH6hYZJqZ9qmdie2HLTYq9SFYJlIstgrGwl0sV_bxI7iN47WsisKF9UF2aV9q1yAVK.JyYyYw"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/g/orchestrate/chl_page/v1?ray=9136b50d5d74fcff';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, "\/8921\/bibtex?__cf_chl_rt_tk=kd2SoWYxeDsjG2jlK5fpK_6oj1S0e.RRrHL5.oRsPGM-1739805058-1.0.1.1-0kam5sOGgCg4CnDETQQWI3mfG2EOzdBh5Ubw2uwkIEI" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>