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: '9134b0134c936045',cH: 'F2rcRTh5ES.z4RhYpG5FUt8ks0hEEIrtLPQP7alKYXk-1739783882-1.2.1.1-gco99kAqMRQF1F3xY.KebFfPqdxSQAB9gJKxyObjvpm1RN3Jju2uv2_doa1mLw2l',cUPMDTk: "\/search?q=Feature%20Selection.&__cf_chl_tk=JX7OfdnFhq8Tmy7ktlW0ZHD7Lwm6jrWoqvgAioq_ljM-1739783882-1.0.1.1-BlDKqddThcDIUKR72XOCgM89D4dPK8YCsQJaVyIYhH0",cFPWv: 'b',cITimeS: '1739783882',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/search?q=Feature%20Selection.&__cf_chl_f_tk=JX7OfdnFhq8Tmy7ktlW0ZHD7Lwm6jrWoqvgAioq_ljM-1739783882-1.0.1.1-BlDKqddThcDIUKR72XOCgM89D4dPK8YCsQJaVyIYhH0",md: "vGSrTcjDn.J0dhjSHBIvIEm9USa8UP1qk.g7fX.ZSgQ-1739783882-1.2.1.1-_pWK8_iEj.fkBpzySJKWL6G_OznVecq.ISzHPoWKxXvoSSM9o3IfZZ.KtrD5ZMpRyLZfdnRGKV_dOxGbn3UAhpzbiuEmrbA5lB85Nyw5sXzSPzXuxyW_mwyLePTQqAfs0SZQmK__xqPbWAg6tvp380S3khUBqwxV7LlzEsRmu7JNFiqeam0G8o9DuJIS2BMrcq7yupEiiG00f2x_nMbdL3HFetRbBBGqAfRhHG1V1a9fxHqssDuNG_w4.6jOYtbHniGjj9u5JZPj8_Ee3.aS5O4CVEmimmsyLQyBtVU3z7cXOQ0S1gwzwADjzIFf95IwRpXr6LvVK7BDws3QpjJyIqV_Y4BND6Na6pi3iNbBKq4JwgkDo7Eg.czcFAU.bfC1x.36lpFx0FuP_ryXhM4cl8zXJnZBWI.Pf2Mr7_u4DdEruGdbvS5K8j.gEAAcPx4SJoCS_185xndfLDeRB7emFCIDdbPpcDVNEE7L3lvepKCgHfgbZnuajlO_Nb95K_tAkzFYn6CkV.L8QUgqTwlYk.71qzpAHYx31V.p3idbL4NCapDGTrLjsdpKAlqEMEt5qoM_79kOhwUBCh20wLLISNYP2QgsKxDYKf_9NcTQXeB9puacY3GQ1COp0t.7dVMqX1Md8AtpKVKfcXJv9B1TBkRiamq2OK2ZrSrrqVWu4kjQfqmlr4Lk0xg5kk4A.fM_sEl8Um2IRsDMhdaT3PM5yjBXM4cNz0Sojp9KB7SxUFKmnbntr6glyjjjpKyfn9avE.oAQSzdv.S3DrbSpFVJJIgYh2TrfZlIOnRz53GHOKT.HyLTj4u63cR8qs1eGRqqWw_VlJoHyG012UOoCr7vq2eu6wp2PBHBkTy7tOuuIJVM_CV2Xz4mmC4FH.DHSj5m1yM5LFNq8rx3nWEO2G2PQbCgHt4.fVrzP4NLHJGb6NB7kl47aLR4ZJ3vOIOgHQ8P9ulBabE2a8cx.LQPznNQtOsS6BTdT.WE.mujwkWl_5YXRRtRQGvtU9Rc_k9b8c5VHn6AII1YN67Qvd2KfcyNc8EvMXyKv.Va7KmafZLdOKq3H.2CUqfqRyaMFOk7ajJm_EgqsNSIU9nJZmjWCz.93p2ypTOv4SwlhdFqxFm4cGEK4oS6zciIQA6tWKbPlvRzo.HfuHfKFM0wb2fAH9.QHHfmDja1c4M9a7JppFXrQEfES_363Hc2OsC1ortiKLSuoAHTU89Z.DWMr6wB..lThYxCQ1CHUF_x4P0VzQn3ijXq_OGg07MqhTga6RH546MsLHTq0_m3_v4FCjwp5Vr9hj97g0ClDolTYZNURhzBpG7fy6yo9JWcMJycuSdcR7HT_Opr..irlM5pzKWgdxB2MuQT9_sdOgTOxKxL_HiZQndlWkb2VuLE5i399sGXJjvY6ppWtx0S8lPrf5Sa0RR9WwHLRvIBwS6odwyzmvgg6iopNneHvGQQuBquYVPYZk7BtegF24l_GWihqmJNemLvXL6h_l3Z1kw1Bzo_ud2WqL6a7EiIkl079HkiK1_EIzoEQuXfXMR9JefOuripnAsL._DQp.rdW7XuRd_vZ6UsEI4Z6GkTfpF8kGiQ1L8q6c9HIg7U0b7P6oLL8DRXcEdndlePb2B_RHhI2x7DyB6Exap3F2MXmMFwPdLuollqtKJ7lFYgkicZ9su5bW886_1uudxSVaBHyFl2qXBynMH0zlR6f4.HEvv3bLGRZgpkBj4DS3veb0p.EelZ6HumtXnf49vyj5QsHaic4SnlV_NXKjfHDV2_RkS2gK2i6lhT0E7DdGErs5WfB71t8IJkKAzk_DY9g5E17wLAsGuV5_7PB2xCqPGKEFu5AzZ3vAmQydBDI.63jVRI8b8rvppmf7bhFg1DfkkrBdHlKlrCZyUt2ZkAY5mqf8SjJPe3sS2v6YYggXTrxrG8tgPtbPSjrZOjbg",mdrd: "58mNzPuDx0mnwxjEFTDVeoyt.rls_JnYTkvB3TX4Htw-1739783882-1.2.1.1-ewTvd1XCFT1ssrmb26Fku0tQHI6MgisM1L0MzRzyzmSwoKw92a1pH1PykFvHHNitf_3gxzv955B5TAHxpZHBS9rMkJ0.jd1gAYBRkPmHYbmcWyrN84DBn9J6vUJ275oYi34MQt9db7jPvnbcie9XXlGW6HaNrzgRTuzB76Jvlpm4kDcrz46sNwr9aYNUB8sGDFJPo5roGhio2Os8Te4FqccIRXCUiFHdbREPuQ3LF3Vd7R2UJbnT9Wlimz.gER7nHAno6FJO5c4qKIKKqYuoBzC9xliz3KyBgAY119WWLMNh0HZj_A2.DtxdPQRUWiuxiQGMFIOQnFTDYARxXdj7mvjy92z7OBoXivDqVVuWH0bLNNozp0kUIDdLlC0RaJAFCtdx7fsHMc8.kuiHCVeGtQnwnweFIDumNoAmtAEpFsEVANeLr6nq3EjCg_OrspmRnF9RDuV57yohPp6O.14SLRWm9AC3KSaXPnpjzBCJrXjpeAT3fjmOXn.Apqaj7.NSwAzQ0s2YI5fN8KrVDkb7Cwi0EkwVDhL0FOgJ410YTQRPGaZHTsskLgMeHlkOpRBdtQyBpWgP0ihJe3ohZr.LrsQTdUlOmS.B0MImCZLsuQxIigK250A.vXKI_nXabRYkpv183w9CI9mCcaL0btM_Bvb2KpaYJ3.yHuXjcHcL5anGzWlCzzftWDqdEHI2Kprhbt3YErl50nWRDyP6m5bOdK1T6CP6cdSjT9XeJHfMi1PJI_5FoiIga0.bdkTDBlpw5jYuB9pn_69rqV_T9oTCGUgO0ojNojvAZujWI.E6r5FxMXARRdT7ww9GJa_urq3TuntS1pgYhI_94Z7KjqM_av4S87UY0aGw5D8xB6Ym0EIiKEAR9lPKHzFIhA3XDDyIY3j1VUy8U7F8h_ux3y8YvpVcdUbucm_B8I4JdBRw4c.cRqxrvUzt3h2ANIL.LFnzInLj1.zIxbHsXjPkTIgOv8QiFNCmDMDkQ99QI3JGDtUEWHw9.L93tMPvP8Rtbli1fOM9fLPnjv76HAQRvFGn6C2JNIQ6zNCqy7p6XtwzfExBa.eh7ek6or2sBQudLI6CmLL68UEebkx69xHPSfuXaNeqZwxn_sOu_xXODhh3mjiyT5fl4j6Yk0uMbeM.OtFV3wdlxRysExRehpjZZZ5HWKJF1wB4eGRrp_rAkuvRH6yyJHLLMo3YgWOITJah1a0kiNmFQhI3WUOMzT6b.v3lrkglHp7wqkAqkQM24iMldDTw0Tv8694pZbUmIpMoTh27NB_6ZIIkxmBLj8lww9.CVT_2YbZ7a4_u9KARoeGvZRAWfB.bORfhcWz6t6M1hHlfE6QKFMfhs2UPnQaxNjgVgfUtq94NzCjVKAwzObHWB02yHqMQuowVyqNYqTrI2f8qLLxME56lX5_65WvblHdCRwAbKpbhuyZyNY0pm1Y4GX_UY4OXB_bht6beN7eAikG0B32Ia_lzM.N5luINixJJ6G1mwPkS2VFjCMGFjax0QpEuNc843SbKqIvLa3LTHK9WoYev_wEGbMK.VqxNBT4yfwW2KGpUa4.g9ANPlXOkKwky2iElYlJVA2jahxLNR3gZ8HBqe6yczYY9aRd6h7Bk0CoFT55XbubmOe2U.WUod.jF1XzeJifwacj_J.47HcQY_GEKpvuFhJ15z.Z.26s6UiFBJ8.y5ydc44dfkG1Tocm9vCpbPsd6q5iLEsJega1ytxF3lAI5u.tGAy_I4Y172fbHnV1..HYCG48m9azck0GDaiwl.vvLmFTYZxwjdrVCkaNGf0Pw6vGgDpRUQPnrM5gBLNarJRDPRBCeEh2UtAg1SX5lzOFhBjRIeKhavNJmyOzUnSUC089DZtz97NEOQ_HM_fsvqwK07QUKDjBwhEEh_jxupvPWWepIQ_dy8jSOSsFq_NnH45T9nH2a8v8g0UO_JAXnIpum_30tZOYiL4Y6BvjYngpnEyt24Gopz4C_"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=9134b0134c936045';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=Feature%20Selection.&__cf_chl_rt_tk=JX7OfdnFhq8Tmy7ktlW0ZHD7Lwm6jrWoqvgAioq_ljM-1739783882-1.0.1.1-BlDKqddThcDIUKR72XOCgM89D4dPK8YCsQJaVyIYhH0" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>