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: '91356c5baf6c585b',cH: 'o6wPVDzCXiKVWfu0c0bj9iZiWcbuG.Ef_NpfHlTggz0-1739791594-1.2.1.1-JLMQjJuUSbKWf_NnNdOpydxdH4JM8PlaSBgXMDl2pWnwosB1_hhLmg8AZABmxPNR',cUPMDTk: "\/search?q=D.%20Stewart&__cf_chl_tk=im0W6YJKh7QQKSHvVWuAtzazWL4bmVEniUlZBZEc8.Q-1739791594-1.0.1.1-X.RdV9H.bIWwnxaxVXaplyhmtCSjrla0rXkA4UATNe4",cFPWv: 'b',cITimeS: '1739791594',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/search?q=D.%20Stewart&__cf_chl_f_tk=im0W6YJKh7QQKSHvVWuAtzazWL4bmVEniUlZBZEc8.Q-1739791594-1.0.1.1-X.RdV9H.bIWwnxaxVXaplyhmtCSjrla0rXkA4UATNe4",md: "L0KMFeneFsa_IvWADoF74MXSDGney7v3AroNEAxly8c-1739791594-1.2.1.1-Uouf.B5dNDz9NrXhCdq4ueKYyvM89tN.aJL1VFFUj.N33IoeYeLSF3oFbe0IXGta5hoXhMslEQgkjTcx9m3qR6Dgyt1dBqqA7lTfj8nO5ROwy0qW8Vsky68Hu_NbrpmJb3xreJ13y6WYXSyCj5W6OQA0Q8QzllMiU7sV2FCTlOZykeJ_Z0wyG0ybZvw2T2NqsFBpA5.zNy91nXuzd_pBmBh9xPcX4oN_b7pey_.hfbfiYfB.cocoiEfYayC_wg8MDtHY2zlAMl9ZHVxb3kAH9u1ka2zjODKRnQGmR5QekxvpEEk2gHKOJknG89utuUqQ2d1JDekx2b8kWZJNM_bmCJIa6fs0JvFgVJUfLyM_Qu1q0.HIrj7Y.rCHRaKPDiQ96sycCDPMFfAh4Jw3tWys6_H4XWhH1ibibJ3JSHFgXTzbatG.j12NzhXroUnpnXiIMkUiKQOhKXYWwsPAJ86CP1VQtrD3inrOBF6LlfZzYf4E70zKVdMnw9qlFeK5MXz693NyFxPWN2Knz10FK7INdUkRV2p7q8xS6rwk5DmKo5xi.v.rgHt6L10jE7fboL1qHIHmoRqkZ0QDjOQSxV6jDu4bR19qPx5d2GI2IXUgsXJMmt7O0vWvt0MM_s0SOc871v8Eb0i3_r_N3pA6Si_y6EKb9KDDLJRLvWlok71E45ShDtDJ_ZHoGajca7rWnN7gwJwgJZHdNTBJNENWkolAwVr8mvXrxTh8Qo7xWf.aqTJFYDEYJNbKXzzJToSx_lzye2jyxvihY5Fxg_RUN4LO88zGoHkk0.gLv5kpdJ8GMVN4GMSu3t8hyra6hvEU7TIcf02Oi5stJ7CmAn.UcWiIOBmZ9GAdTBhaOA1w8WC0KyGYO9GT9iKksb9CftOmVHEaqLzesoGkq9MRLx6f3_iqo6TXIzisSHhd.Kc4DNJLfm6KPUr3AyQkCMdgBZ1rPjL6gwOlmHRw4exkpwdhpqVW68wB1dZNzsMDVwBL9.AmsoJUVOuvgjfQrVuLfFwaqK4gDxNPYLsNSWmbsAdkCya9oCtrd27jQNMzUVgI.XncctFpZOaQtipwbbbAR41gWkvhz6jSWrjRgqDR4B9olCuQ2_QZswyNkz5MaTOdZhkjWGrlyDECrcrN6KY4GvCgRN0YQ9NYp9p1HQuzsA77HJaHp9azZpM9OOdGgEr7OmIAVz5yCNhGmmEv2QeEmMyh0YPpDAES7vOpkUcnTk9KsWLKpND0qfQX.auQyiZpbSMbD40DX8bcZaYYvwYN6v6qWfrxch0CLqjzeJvPsAvjFyt7uCkXUcvzWNeGjuej3lLuvIZDMk7Rz_BrBQ1G0gbOOx9wrYnwSUAsnaF_g9qhqtvlLVcVrGw2jLY8FCpsNbKaayHxVA6wHaeGc6YzYHkcXRdgLAj5eOvA0kLTizVQ02THNvDY_Av7kPaQudubSjxu6qqXueZmzPPaAxn0Sw8YSJjLt70Z.UAzJoxP1w26FD5_KDBDwuvzReF0qCyArSmHmDyVk7.wgEhSA9cgho1Yeg7AeFLoGSM9xLQiAh5A2XXuYomnvXLrm3Pfme6QDF2ssT9VLxvLex66P.XDdGG9cAS34HaJkBxRyELoPsKygIAD1BqydHFmzTCKmTNPKOn0WhNvw4LNJ.7S2NmEW7lkvZxvlRrFTICdxNsRQZjuXASkvsJ0x1LMaxc2OriRZENzkmvtRotWpSe8FHkirIAus1OqOO6aluLfoG36pligCqG7bFJ02vFnRyNZZyFHKzl7NQscQkDstYou.x.EVGt2A.5XEM.DadqkK8Gwfkz6WiCR0JzGTM1S7cTRtUBpbBDq11e.759ppvuLL7_TWLmXZG0r4gMo94l0yGc3Yu5gTvHoOG5rHpC0C4LpVXD2phWVHG6Es.0MKVB5DjhOKz4bllnz",mdrd: "Fgr1edYVxWYIZHGT7Bno8vln0I5mbF9Qado0.ByoXq4-1739791594-1.2.1.1-6ef.smKG.knj9mT_ookYertlq7.uoQffehrRVQW_SEPDEbo5trsOEkgnlR4oHdo1x8sUiwaJnXw8RbxrIeJ2QjViaHfmracBCi90vNco0dgOh1T9mZP.MrFO41qlPsE8B6d6vSv2WDsX4PX5x.kIDykL_5GyG2YMdXaGHEKmkIpKPeX6wSkepJwSAAAMXj4t4ThS7.5ZNi_JK9YkfG2tdDvpJn.I33mq1OsTNfroKkWH8F2iGy3W9N7WnQKcQFoV5PStw.8DGUCF9ej99yt36SWvIXajEH7npuHszXkilKAoAfF1Cs8967z8ThUGOzZlo23yuhZ.T3vXiZY0HEL718PXVgHpz.5o1PesSiA9JsCuaRbbvbM8As7B5E7dUK2Kh430XRD7xSwPJb.hpZdVRWnMs56xA7Z8ObfK2vb5CkKowtLgX0RhvA1i5dxMYGiQJW8HRoCt0biza2ptKZXL_PrJxGYx33YY0dfGBE5pM41yYJqOyAa7V2ZVTczBTebnAJyJ3xXwlA_QhqumjVm5Oi4d6b9taKQwbi2sMAzaYitwE5EaHaaFFd3oyoQP3a8h07nk.KZjk7DqZcN98HIImOF_crAaPhasSa3ypT5tTbHW31JhLUkGcV7Sv0UXP_RRzY3W0uoIp7cU24cKvdozYpFfUaVAbHjUryUMzxNIJyOeNLaEHQTjIScq9kfpTZkNYo.l7EX356mlGRQW_gp_ts3.vcit7ipQJ3GlayiTiguPb0Pnppexos6RbNfalLHvqef9xAVvjVuuxomiodCf9U2raGWO_V28bp6YoggRjJLfH.NqBtv6RywEbBNHZwTfNfWzr5no0hsjhyRdJvJ83INF1EpOfl01LTaqT1TZy9ewJWJh2CKIMQLAoI8mYu9E4CYgfe.vCiN8sJyokJMEhFmpICcZXg6rBvtCkRDKRsh8jsT6feT3mAuubhL4AZoAYCp91iNTCor7HlfIuXXruyEknHFCaXUJNYZdthch1GIWywztEjQklKJhNHCqJKMjRBpgSURGy0if6OJpCReTlTMKfJ3MEr.smx44.xmq8YYi5vWsIz2HOApbCC3mpLxqJJhMiiP66nOB0cgUuKqBeiTRnfCM5313J5dAZ0iOM4t5IdsSv0PAg_ENCRcz15xR_pxQDbZWKAv8KS5wAOlQImJzW0LK.n_u1.PW3vosZs0Y4UyQiMk0U5jQTvGYkO6YUjSqrisrewu86pmFlatSJjuiX99eUwEw3qVpd6Nviz5Rm801MsmwxhAS0Tf65gCat5oJM77yG6iiqX7QVM8nnki0mIKcMzb86tbGfW8.TWPbRB86pcOPRV2nBSixgQkW.uzhebpThqhMDgNpVMp1M6zV50sX4_Hkccoh7veF5TUHPfcG_upsx2he98YSBtJTDLErerXYAXqvwgbD6LR6dGnsSzNSYdaL3TR71NcGi2eyGe5Bp6cyG9ODYA.h9flgLaxpSpdZzm23YN3DhPlig0W1Q13k4GYRpPKeI7Lwv.EkfW437aZ6V6BJBHfe8LmE8.X1pDw7JYEPOP3FkqxHr1_hkx0sWOjuEN7TNpS63Quq5UCBx7E6nWo1OLRsMn1edZIwqZEBZkHPxvVRbe0xN5xLdvgG14uGLv9dNWKSZAZto.ezB02izCPqGfMgxn8geYlBrb5gkWGyb1l0a6Qv4tQqMbgEzs_3LNZdOXcvFanif0lZ8JbhbO8k6tlNH.8dd55U8wq0qD2OjBDtPQsYINa9O4VcXEIesu1nGhcCGzbzDsKnYs7hNVFt1PFQ.MNRzKs3OJwO.eZWI68Ccdx3tH2yAOMEST3ehkYkV33tazUXSnfSZwlkhjDpXHCYUEgUVrFJHkD9S6Y8NIb4TbVayhkPPk4.LRZhq4SFC2A7aPKj0XvCVfkQp0s2Z4ZOz8wb19LT62OFbxOK5Jwf8rAjZzBGc_Ix5LFixxWu5WF0NGiZ8enuHZ4wFXp8zn_hLFqt"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=91356c5baf6c585b';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=D.%20Stewart&__cf_chl_rt_tk=im0W6YJKh7QQKSHvVWuAtzazWL4bmVEniUlZBZEc8.Q-1739791594-1.0.1.1-X.RdV9H.bIWwnxaxVXaplyhmtCSjrla0rXkA4UATNe4" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>