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: '9136a058ac2f3e14',cH: 'iK5dm6DlWaBX7hhfbtxAiE3CHvcZga_74J_ZnIMYoro-1739804210-1.2.1.1-W64QX8s6eX3rauZGytCLeXrTdYPbA2vRWsku.Ap4BfvIkGm0za16rGvpkqNzhIbY',cUPMDTk: "\/search?q=time%20constraints&__cf_chl_tk=IurJaO4JvyPJfyYws8iaoFPQAxgLJhoFJNF4ENEuDvg-1739804210-1.0.1.1-fO1_GpAaS2N3CxAeJUEuGbNOTclLaXciDOMSwz0Ptio",cFPWv: 'b',cITimeS: '1739804210',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/search?q=time%20constraints&__cf_chl_f_tk=IurJaO4JvyPJfyYws8iaoFPQAxgLJhoFJNF4ENEuDvg-1739804210-1.0.1.1-fO1_GpAaS2N3CxAeJUEuGbNOTclLaXciDOMSwz0Ptio",md: "nqnpPfaR1Fxr3MaaospQII2uY.NzvC57MV5OPT_8aMY-1739804210-1.2.1.1-V76svHZXrUh5ZBtAOcWubJYVlfuz7KJg4nKEPTXlsQTmvgRfWDKHoy0XhliriHH7NccPj6HrmiPUgidxXCJYTZkLGcKU_JODXbaFCat9LrUC630T4dtGoFnfLRiOHikTUQ_BlPi.o4nVut7tkU0WazbzjRR9jHKxUvwkmzWio1XlWgZkC8qLI47Y1zk7IEOtbppTy_3xFYoEdujMZx0mmhe4RgCjnTIMadqScp4X1rcKw9qUW5raKIrEk6iEeCGdBhr5ffk5qvbRW2Cf3h33o4vHak2_BmYSkW5VYTp6ud6aZaD23BlZ7KE0Q8lIPEYcNCzawYJWiMTRykNjI51AzFu4LJfBcvimVzu2Ofa2GdxltT2wDLVy7eW6fmvCguB.4a.E_EF2JCuOl3PvwDBaxSMdCXy42pzeSIY3JvdBbl6zSlCV6QxasBePnTLpScfcZt23ZJr0zHp8sVsQkaPZYwAjFKM.uUB8JGKFYAkjlO0._I9X2WgTQWaAisToktKpscnpt4lGjde4Rmtm_nirkjcpkiM.5sNGfMP.yB0HoF9BbgdlwR9Cs6WbKXfXkJxpvPR1UdZ.R20lw19bVHFFvmxPSX9D1PPLaQKz14AtVfTQvd3DqP73oUrDMShg7ruBmPjgQX8o3HzAU7oLiZMxkM5YsdbX6c.PTg9eWiYEHlByLCImS3HUlYLYOUQumbWjIT6uMlj8UDlBraPlnSh97tPkhlgpcBMw1eFZe23yG98E3eqcBNOem59ajyTvLSnexQKvYp2u9EZlPqKw9W.IN964c7Qant9kPHZMSfkOqLXv9f7tGobwlqpJbbDhNGV1PPq8DR7P9WKf5w2p4JHp8lkUqT9LTy46L0_DFitAIj5n_LmnEWEnzKKCSqmy7sOWQJXLbNlOslrgLY07wv3nEqYC6tw.84wjalrb7AUnFnnhg2yuzsMiWVsucOz_GLdm7CoZdjl0SVA1Ye.xwUN7Isu_i2U2JzDgBiesu6qPXaXZrHTq0aqDJK0rUkCAtbb1Cl7TJI5Nye.0jOARTuMSL7lYrP6rJVDRxN66R1BdgET4SzpN35b167z6MO4XXgE1CbA4Y_xfE19aePooZAZRg.bqHkTcg4ULYTJW3cBAhm1yogq13CXwjmdmrknA_jccyaotAkFUbw98nBHoJ7irE9vdJp8pDh0GOoZjbHoyIdG6OhqhlUCw04DxDJf_uUi8.iaTVjvVdTOJI4uYfxGaCMWv_5PgjO3guIwRytbWsndo3bZi_v_uSbZJVBSJn2fGJ3bLwjhD3wVfp02YhXCP8_AQFw_bkWJCWKLC_RcBSgJBZuI4ab0KHzkgRbt6hrvuPtyFnCW6FIoMtMmlqt8faMu5kpaK06QLklkHu6KfKRQ1KNhHeoDzu6ddRSTaMEClsgRqqQ.7uEFieZsT1H6TSe3Sti_VBO0MhxeFi2oKDpz_UZ4zIx3QAEmB0ClvYdYNg4iB5KRpWyKV7CazLQgeqaU26iVYU4eR3Thl1B_z7qPGwDStHdE1sNk3S64e8AQ.Hh5xzyVP46jcZ49MNMx3FjAswvuFDoRdE5icEaTMFusPGzHKFrrzz40jJSSi3Na3GOs.CTY7crccC.2k3XmcI0RCL3W3ve5Nv9rSoJhoTEG5QKJQUCqhaDJHsVBYxXBVin7roq4P2PiOCWtFiXwkxBO0s4kaf4wWWVmoW1NlSEdpLoAfJzcEmDamNqmDDKN_241PRuWOrKeSaNhbs4iWF1H08blpHZGdCqbNNUYz2flNQDu6OjsgeRorZgYfJGK1j7AmlbCOTyMGfKCK1I8364O3VjK9w5h6JhgdIl3LoxCGANidOdQbPp5zoK30won6fHu.fXVPVvT_VKLFbSJnNYewmdb_2CkSR1my_l4M8QhLqkoFhOj4X52ZsPhvfLj_NN88V042C94vlYyRYcvWEA",mdrd: "zZUD4fln7_T2i2xb.dItZaVFgbyUxTr4te2rM1AXFjg-1739804210-1.2.1.1-Z5VJSy6wCU7U9ZilnrtkTGVo3FQKY7tv44jDHWPSa7_66.eriXu6OPXpVtilN7SesbsmFiWxdqGeI.mophyAd6UG.BxzMAkiKg5_s4NIpao2s3J99PHEyGAXW6H4VOi2akB765H12772yE7Ei2zO4Y.1hnLrwcgcHnB5K648Jj5YW8.sA9eNL6GmKTGwGNvZ60ySSBC1h.FdMvyR_5WAnHZFMqkcI2mHYoYLsvlOb5lM5gKb9SiUoJn1m9RgXESws3nQgg7SUdHnfq7rCnAkGfp6rhiewynI7Z0_bOv7Gg5MfwYQ7oXGYT4iVWExENYYv37jizrd0VElmWIZkLTFDI5wLHYQCs85sN9nKM.txjV8_4DOSv9ei3ZjVjnVrDYZHyhWha84js7ceQZ69z5hq.JEp8sSTFCUNlVv21ziZnCEqrfBG8V95d6G0JSF0pnzHb7hjyWhJ3YzZAGY47yTnCI1Y7_phu0GV8LwR3YKNpgary20pZjsMInV_9CQl07rfJ..g5C.C8n98ta99XSbv5IR3xVwXJzmfamZd9i3J3q17MkuMel9JJL3QUYEFFQxqyUdd0xol8r38Uts9AlXocpd56Zg2RpSPCsJQ7D9eyStIUWTJDQOCeKpmkdvHqfTx_IWWtU7CAxL_YJPD8Lmo7Ju6_gZ0.NIFQxyOJf1yCbpdcC1STPmryTphESdP17KnwV2VJZMZ7_iAxpMInLjrFjYjQGc.ObTuKMroXH.GcH.NWPAzGs2J3hd.OIISXMcFwqShmI7GxQXlI90Ko4R6Lf27WS5b6uEOSpHlBLBZ7ZpLSBHU8WyESWxdY_V6yMqUil.5vN0sXkIedLUJ8wYp1e8xoHh2Corg_1NqxbKuaUlon0efTaEXMg4kZfk.fsyOUJRFcphOkdU_zw6Jj9Ckqse3cQQxXD7_v8TXxHyJQlsXayONh9IU63qHYSJCE62MdEH2zvvuexByQ2uyqnDm79YnYT3j5i_xanuOHCvNW8w3wFLxFYm1STEf5EkfuJ9GYB7cDBaadlfU76y_xJl7ZX1aGd22dLjcyol94W12S4poVivMYjdwwJqXv84CFR8NHj8YtFrZRs6z.S2EceaE11XPpcm53H2lKRQYr2BJxNbzH_1bejRAdChSeAvGGoKZO9gkuVYeMNxmliwcBpwI8_0ZfjVNS7lFQuo1xFlXdFEh1hEGWOUshOz86NQttlSKlk03Pr2i5.1sLNPdBOzH5aWPyjfaVdYx6XJ_gkqDkAv2c8CTE5CwPpmXLBSuFIFhQzS78mdSmIXUkF1zqNRWcx92J7H1urEEkGWBsoBvRxofwXCuhNnt8l3xSP0hJYfGaNVA73rCBcsXA1ukLALmHNhLyA_l2y2eiHxJBnBhQiNClo4g8MWIZerdJjxI67W5Bn1b64ZkQNeONzWpIYanOxKc4QOP.XJnZI2T2fqJ52XJ4ynrdir0PyuTrt6_kBRR2x5BkJeL6Sditev89cpvo4W1YeY5bHH.TH7DutqSmCy2UQTuT0p_GFE..L4AqPmCqxpuXadfrmxlvHRNipokfhcg5qdfDiONH4PC.BPc3d3IhbS6zQlCvNAL12zBjkJ7rFAaJXRdFoKTSEllhYLK7N8uAW_YQHwpGjHnmp3HIroJ1AgtdjjSzvMmIgAArJfbhHIQEDmYDEbtoZs6IWK4VJMKigWetQziOWUO8KNeuJZim63w0lCKVB2d.fKLsS8Kf5FjBsQciaYCre9Nz4XE2lV3ccp5eEmvl1V0KWZSRvs1bc4DAGD.Oq8hFEt3ffqcQo5nJ973tBPyZdpyYEmbts5keYO6I60Rp6UmPLxIwMqvGFzF8hDxWDsiPgbwplehXkC6VgXE.SDRvtzzCFastNyTBSD2gkYG1_aAYd77gKbUzC1f4aAf0Nf0Tk7jcyUYKYis37l5tOUgydbkuxwptfsbJzOO7lKw5Q5uQ9kf8_JiSqiNFgmIWQ45hRYqtXI"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=9136a058ac2f3e14';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, "\/search?q=time%20constraints&__cf_chl_rt_tk=IurJaO4JvyPJfyYws8iaoFPQAxgLJhoFJNF4ENEuDvg-1739804210-1.0.1.1-fO1_GpAaS2N3CxAeJUEuGbNOTclLaXciDOMSwz0Ptio" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>