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: '91350ec23c7b9e41',cH: 'khKm4ZggJWjR9tKG8qT8jSBC8t7FvyjPKvc61VlEEdU-1739787760-1.2.1.1-_ZM3xQ0HrL1nRAPtPry_gHffLe5avxlAzFqbOwr9MOLozoEONLnftxZYbwiV0wIW',cUPMDTk: "\/9997440\/mla?__cf_chl_tk=hS9oAhWukNdgacMM_KGBQzUwTbsQtooE.9YFym_hoi0-1739787760-1.0.1.1-hyLaPLjtBbpqU5jI.RtHOZ_kI.qbUal47TqHxLctz7A",cFPWv: 'b',cITimeS: '1739787760',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/9997440\/mla?__cf_chl_f_tk=hS9oAhWukNdgacMM_KGBQzUwTbsQtooE.9YFym_hoi0-1739787760-1.0.1.1-hyLaPLjtBbpqU5jI.RtHOZ_kI.qbUal47TqHxLctz7A",md: "62AHe5hmzDD6OU89QA1_XCN0czNkxOAYXHZyAYoX83Q-1739787760-1.2.1.1-HfhLzMd7249wguDopJDYWX25rBfweODEWdBWa7anGG2gFctSOvqQALmBheWjBLpLItpQ3ZN5Yd1PUyS4QiZuMWIMz7Ep0vf.PwcZDeqyFfHCuD9SnmOIehzgE9r8tVB6oZDAG3jwBhhNALNjMqvqOk2akAPulJasf4Ud8J4JAsYUbt2Usfteez1_jMd3zwuO_28ynw_6pyVdLDDywNVWgMs50dvKIltnzjINxjKPIxIY9MlKpunnbKK6p_559wJVkCzt0mlILrYqvbLjYRg2vUa9zJXuSJEyNGKInJi.2nM0dOHA0O65RU0zgOsxfpEfJlllXZAAsLYqZTyWiQ4OTJsmDYY554II3js27XuQBWF8e1ol6.arsYF0mp1B4kjTgUIs9zuHA93bEZIJpkU8Sdgp2rqgHEEcRYdMDGJqSovxhC4ynf_wpdXnjSJg1df500tT_HP8mjQELSMspnbBX9Rx3QbOmsd2EvWuFH6uAvaC5vNxaKi_JL29svO8RmB3lD.Sqdjv2WFVuR4Uvsc70ZTBu7vbb36He5dOyHLKKi9HNcVsDE8IjpEXccr0ImrcFmBXzoOnaYzw0A5Pw2xuHzYr7YfX0b7pUBWDzchFyAA957AQ27wu4r25dgs21XXPeUN0z4GaLvfiYHOqrF2VOoohq0Ta_yd_rkbiGom3RqUebwtVFW4Tz.CEOjU.cbnyyY6GJHZ1GBALpkmGERiDejJvYKShviIBlsiMLx90K_ooYGK0krEFqjYCPPedjxs.GbxvqnH8QLCI0BSLihxaEeuomUvVLgaI3PnduShM9SPY3aHTAiZG92Mm1lie2ZWlLIYTxDDaIWhgDR1hvxH7GK.BW881rM7tAqMhPDY_gO2konSkq.dfeBoufli7xsOogFxfOtFND3D7xJV9yulQCUESm.p82jk3cu_aeY3mnluH0FoIzzXWRBffXh7ankS8YabFRBB3VX605m1FiracDDmXQOZlRrNY96PFMf4JCZ_2k_BAbfnbr.wTUaucn0gdwrEI5sgBN4NsFzuGWgryq01m99vgSwpy7tLjeL9762MpEeFe9kHH81eJOX8IDNQFkzZZT2yul1i.21YVIsuoFc2FU5HTh4XNJydq8gpg_WZ5HcDDG_oq6xUbJhO4mmEZiNNxz63S8C54jBwLNSA76KmieluOZFzY_YK9I.Bqr4ztCn5LNNeRRCS2c.tJkCRUrbbTkEDMV7kTUa7918HArDHAM5o6C5pv3GO779aBh41dIlxXsVX4J6RQcSx66BYqa8jmSUuGNTn5vXCn4HRmh8D9Z19rzneDHVKGLpnAUi.ZcX0DdDxRq_mrDIF9qFi3BtIodoi8DXthd10enFm4fdqLZKV54ayfQeHl_OFs33p9HSN_eqRzSSI.A2FEZUX_EK2HDSw6YuEtKdNJ5JXDnQs2ukHyjJ5xqCWMHST9dgTQxP4FezseJyXnerVHZVm3BVGypBp561P15nVcn9kOALcZIRZNnzHtaf6lzlspry4MPy10PXTTq3Tn9qNfBVphxiBm9Ax7Smit3VmaNynVyubOANszPO8ApFabZqGGTTATfGHZc.spNJDp7u93LC6iroub6.mBiunKzZEUNVTDwI6Jcbf8omNPqFwp.bQedcEZ2k198pod2LMAXQOdmDMuHPonOuFS1AqyLVSTHyuDFmu3B63Z.sSpCIdcVVgwkqscJGBJt.SySPV03isXDrP43KLA2LBbmwRZQ6wkmZvOgJGPtLQVWdj4iGwjTJO8WAMd.e_gZcYj3z3h.lsWmxgWMYR8wvZJPX72l6AhdcOlvNApGHwci7yZ_biNwNRT1O6Ee_ba6D_LyPogEUwU120xtrjQy_vQNHloKQUHyFT2cJ5M2gP7biEEMP3ES0DmREQ",mdrd: "93Qedm7VerQE1xYrPhew5ruDl5NSRA7Fw2KWPFBK1fA-1739787760-1.2.1.1-X.Dq8Zh1WtEbolrZmnjtuge0ErFh5ZpQDFDxw1QIGgGb0u2uPjRIIoSthPVvU8mo6FxsMggTIkAvIEjyMne0p2eexyiR18us_JHcafq9x6cV5.Aa1m3N5i..kFVDHZDpnsedbXv_5rkPHITzn6ZIRHDtih6guKaY1e.ElRrwc.wrLpzGkuS8nbywtXHs1xau4VQX0mLoAhxuRU0svymi89wtdNhYa9ngbWitng8aT7DCQsavWIyuTgc6N6p7CGSCNIo0W4SgVSuPZuDwFsDLT7wImSjPMcMvOv7Fd4agNk6SKymnkPWw55vuxKJwSYimgw6bEYCxDmXZ1Lhbdgt6YC41R8UiV7m.bRcBugeeTj0lb_R8dPMAVVJAeFyVopPh_G1KP75m6JZ.dXDk8WQeHmbDpolN.eH16Tv_1XShpaXW4e32rDuVcoMJ0Zfn8qt4YqI_Fyz0MHKxTtuKVz2DzB81u1X3pe9NnwusHNlbj05W8dOB5vy6QKcGF7liV5butHkALZzxr3LXNLfO4KV1HSMKh32WMweK2Jtt1zmTp8DJnozYBl8PGQWTUY9oU.gWzhK87VsiVf3c6qVRBfZEY2t_EtNaUXTPf_tlFMkWtkxUWRg8hKfIz_lhxJnP0lg45Jhj53Aze9mU4e85LhNTAQvLhp5grO5Y811leseCmhLGL6Xh01m4EkqoKZm.4yZahZrlADxFJdygPRb97eza6KUiliDAc5YTCsW_jifISWBC2xPjcnsw1wr0L7qZ1c5IQeKNXVEP0AR5WS6WPYwdWfY5WBYiQT8AVm3JqvxMSgUF0pDyIKeYA_iClQzPwvFCYFR7EyLyTp4m.geg.2dgvbaouI1H.47FGBLpFSQNI021ZWdTz3WoXw3SJLrU.NLOS500DQn5xZjBqRUgOCGc3U93C.x0iyZWqoinbmGpJ2eIFgf9TAwFkpadD.WIFL40KPz001UtV4W0qHQmFXt8kVJ2FSs5vSWTd6abBoCbPX5gI0KfptsPOPYipGbZLcV6FURedGj6l9O6IgyQw1K1rNyE2xDOLIpP1CD1vk42T201ZCtdL0b.Bbc9DD3Op1GZbkk4B0yf6sfmI_Evvpb.cXp02iWly4bZV3dboRU2rqSV_4SsyYNQZ9symmJAWDh5VTGErBIgi8I5AIVU9OkMQIdx6bu10RyHvtJmY5wqimdtWUMVmJKoAlNnky1lzsQz5OMghC.tNtfpM.lRHH.8FUU4IKP5ZZepv3krcHPEXTSf4GAZZxh0M5xZFCiGs.68XC7iaGLCuU66HD2ty1NOZptbaMc6YVYYQJjUPtuwpK.v46wIp900Q6NuDQRMtyEz_h3QZJmrlDL1snxxz10elhoqbrjfdrvx23zWMH4tHCGLiJij89EtbvZpch1MS1lG5yUpDA6cQOmAmjmPrb18CD0inn8TMq9fSwRLoxcZOuSRLpgg5ROF_Ohsg0ifd63zcx.K7jm1TbjtidyR3TtKoZ35Wn0EvcG230si6gK7tIzh3Y3rQa8Af0iWT_ENF2flEwtzgP4QtUOTlg4PzAounJNSzOJyL6tjukgrdWj7w2ZyiL.JcL3lZrVgFHMcPko_BwMW5WMJfeXxUjKZY.Flb0pMa1iIri.SJwCDFGGfyRrdVDDLF6xWZN3k73nCgBWAcfCT8dJLCpTGnGjPhEfazYMif1D_o3_uAUPWTZa2C4fFVAOrhfvLRXwUgT3RpsZAk4RBkailQMIG2G4Qu4qK6MAXL2cg.U6fcC4zf.h1nvemWHAPe3tqK18JZjaE5firAq7oc8riyHbj2XbirrDEprlSQ_tdUCjoA0.xsqUmjh3tepquRgxsGKtqIgZTVLx6JL7iIOSx.0aNGTuynEfDiI8.cvSioAZ_rw7200MTfbc4x76t9mlB_KXgY0QUN8r8ZeF5VAFNhCTznCYFHlgryyqyUHBa_1tXME2Y42gH_s5xX8KjylzkkFssprshmJMf"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=91350ec23c7b9e41';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, "\/9997440\/mla?__cf_chl_rt_tk=hS9oAhWukNdgacMM_KGBQzUwTbsQtooE.9YFym_hoi0-1739787760-1.0.1.1-hyLaPLjtBbpqU5jI.RtHOZ_kI.qbUal47TqHxLctz7A" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>