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="390"></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: 'managed',cRay: '919a8d35fb77498b',cH: '7s82cMl5tRStL9qHt8Ynmqjesd7EQSgOW8XxpoGIbuo-1740852002-1.2.1.1-P1zNx5FVw1cpLPzXkihs4M3FYIjarDwGxkcckIiXqDFDkmPcPvXMEMTrFVCOz5rO',cUPMDTk: "\/abstracts\/search?q=shell%20nouns&__cf_chl_tk=qnb6zAthUX87ANTkxHFoFeXD6wxyhaKGXX7Dl07HbA0-1740852002-1.0.1.1-5sO1zyvfPkd9XuByJAJdyj0oXKHz5lmijsMCbUEbegY",cFPWv: 'b',cITimeS: '1740852002',cTTimeMs: '1000',cMTimeMs: '390000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/abstracts\/search?q=shell%20nouns&__cf_chl_f_tk=qnb6zAthUX87ANTkxHFoFeXD6wxyhaKGXX7Dl07HbA0-1740852002-1.0.1.1-5sO1zyvfPkd9XuByJAJdyj0oXKHz5lmijsMCbUEbegY",md: "p.ynAo3KgkFxD8bmSmUr2HsW54IJiA23NqxsIa3mxHQ-1740852002-1.2.1.1-c.BI2DBFvF0rmeN8LmWEjPj2KIcIU3x6dDy7opYVRJZP9LzuF3cLmm1.4z7Bdk7EA5MzSnn3FNiyZh1HmEQg5kbZTyIu5OyDv5e.31qRanTrQdN5JnNy_LCVyiWRcrWdgT9BvN6clG9jE2heFsA3VUeNcF.K6bp16lu5UlMCTvl9WAdIxW2eJAnbs262PegHzhfhe0KSIAnZtlcoVICdAVw7_0RQZruglORJToyNZqq3Ddsway.fLO1fk9e3ZdsBbIUXyw.8O0tvUi31FZoDLOxezVlrzC6WiF0mAGBo9.Z5XxS7eWZZmc98ZEJQoTDNX8pXGAn71r3Z6BjjnivKKWeeSL819jW6G1CTXQX32MRn5mIKrFe0HRCGxUB_2KNrhmiab3LEiAucXOAEcv9phSFHG_2pVJcS5Hiz8lWi_fHugbIPUMwnlX_ZUIe3WPpZjvD8zBZDdDsLxmMZrnj2GtPBSCtn3kWb2xm9qw7yGzGN4bQXtVgftVeB_zLvq3cMyDjyknSjl3zBSAVlKnG0L87ParyBbL6f3SyOEHxMT2wmKaDSMQ9YZ6eYM_OrjWjewPG9ErMW9TIyGUmLspU0PKHv4lfCI2R7JJkwjUiu.gWjijQEf_nw3BJxD2Nk_RDcJ7YyvsOeztYccr8cDG4qQw24pAeLmeV0lWab6ijOKj7ZfdmnHVX8BpWtF7ZmZQMSEV3aewExK41u1WiF0JyXWAnHx8iB_MWmUNtFr1BIaGfbmzRqqhi9FuZaOUuk59cHIdBp8H8I5p2GFe_0fgxCARA11ZwXzzCALWJEjtKnhfikepYsNk92Z2MuCkdCzUZgxcNDOPAs7vYTceo3qwE9fqHfploO5cogEuyveoNr9fq8.51oR8HRuPiLFe9i1WPbHo_raYqYTb8M3hzq.pmKA8o6oFyeQvOXckgf79RTCJOYgi0M91RDpJyERiL5erRiPx_.ReDXxzTxyVD37LKhm4OOEkGwjkJBpdd2Fh0y4tLxXQXepwRPQ2LuoWYXGSzc2Va8zlCa8sYK7BrJkuwbHAovfJrQOazpovXxwKz8d7289Ul.RDNuwZRBigLrE6Ytiw2QhEejdId66eAMzlvmGUSIGuBizoYZszwOFj0f6h_thhg6Lm5K2MhI3Fq.tU7ORIVmMVLkHfYo1aIZ1Kv1sZfUF5hDMP07dmbhNA0LYgO3QzXeA8vwAT9GJRLMDKsU1.vTyHS2EIs.QiL41G5UFVoJyRRxx1eBIuhaPw3kkMUsYbI3CtXQpgyVErYR0TPpYLstqIZsGqQn5IrPZPuAZQ",mdrd: "tlxv4Ivq.tsRK5Z6xeqeVkY6.XrT5y3GFWzmeSUTU_M-1740852002-1.2.1.1-PhxxgaVO9acN8bRwk220OHNQa70r4qBnzm0jGrUmSw1gG9v7Y6xzm_AazF.EGr4AuDFRrDh5aUwGgsBtAdkSu9ozNK2QfKEH3HNhDk0SlbFhz7X8yR7CTDh.7FQ4HBIq2lruCf_le7gY2oe8xMzp.tcisCbj8pEDA98mWiHjTMocxIa_Gveyr7nDCmCJclo2dLxEG3hZ6zvOpJwAMRrKokSF_jShV2WOmCtRI6yyxbNM7HsEfBFW0wk8nG0q1JiN6RF0NnJGTwcRwdrK5r_eyAPdCQLzwrlXB7ghwpK3OrI5ESeBbERyalMvnqNVZ.y_tPrKwWlPhCnZy8HgCP0SYD_BA.xVKP17X3AV3Xp_fwAAZZfkuVyIlRgT7BiIKem3WkluwFAh.xH6gLfFE.TRoKpctODEncOAHaoXeeJdwRj3TfaCQMLu4FizntFMeRLhg_n3R8K4HhQBPlO5awWGsaevxzlMggH26bFsM6aqTp.8giGrKqgMI7Qyao8q5m6xrpf3pwO8lmK6nsglStn5BI_8Lcg.gll78Z1ThU7s7PzdlYivfb29fLS_596exZlsB9nZob8O_zWOyFeejO1mvbFQZI3HwCfXGNsO9wUbqpKabyKSML2u7Nq8YH_tXt9uZfP9JbYS6cSqTSRbAAbRAvIqExqKSNZRH0IEPmjjQZAKSxF3qSTOFkxoZKL5ieF6833sYuUnXwQdGdSV1wn6kQZswHoXTEdf3hBlCHqviNmhfxnYuATq1WmWzJrg5gRxxkuZVXIk7tALD5ZYZeC5x.DTNud7n8mk6YNIEwtPXhCciC66YhnizBZ_548QdZP2s_xUwcQRr43HarbPJzMol5zz8ogUXUImMnYDXGbkiCfOgM7TIScWr2yvQTbcACmD0VlhdDiwNQ.b0b0tv8VyHpD2mIfkjIugiUzjKMo_WYTrrb3lEo_cvo6wD3QfVsQm_zxB_lOoNtF5nXxdYlJVhHJkKlNrzvPuDoTsq39h3uasxR5bQ3ZhneeM_W3SC_EmiXyc4SkIWVroOwspUCwPGZybiyH596jm35onV5JNM1NAjQeGGltTTWuLDX8ryOt545Td8RB9EyAkX5X_68O31wMUKVuDe0Wo9tl8B2FuM6kYPruYkQ3s89RuGKOQWHl0PNdHwLAXaBQqZGuAPfHwjU8yS6WBDqNzUfJygBc5YH4JKp8KrySD7FeAlr2Ltm47RbDnqh1spdnmrxcyw670fdc0JSEF8R4INp3W6m.LoBRfLz.U7JYs3N2VJiWEgVl_2chHXOJSvzsLGV_P3KeNISIj2xCJzIeWHngznUN4b6bfpEQCW258drib2faOSs7Sm4FXTUyEws6IBC75lc_95woHMzw_8XYJ1e04VtTgiDag1TC8UCXkYzOJiP5ommc7ji0I6BJGpZykl9AmFDoJFutMlshxHvaw2OMNH8eGIkHYZ7GlcQXmrUeOXjemTt6Cd31.DVmaxjuoRtm9ukk2U0OT_XhdBz9QFUXBmvyIz__V53CLabqRHeHJi56jCVlue6178OhFMfhV7SZmFgXCLrCn_iPmi2MQsw6d0Xzx7tLGlVY1BK1dkbf6l_3zveaNMHXUmIqRpZItVQV18zTl0EW4WrJeL3iKYLB0U2xlnFxTnv182JBRrYurWAX2qZQynt5.NVTX8mo8rY.4GHvcnEUefu9sQj7bpziTkx_cPmMVGlDSUy1RPDZufv19Bv9LSR5Ijm4aBJPlsZvStX4QZzd__EMfMr9u7uQtqVIyxjErINljMsx03q4LEQQ.WWOQ70TH6Qo71sChrLFYtAN8lLOLrOMaD5qw_ywjn6ezRO_Yc7L_2z9wcWlG6Tm70_Dj5NLENSVrDLK4YZf3lSV38DM7Qz7New577qwnzKP1_mwsDBiAHdFZAlYi7Fo.fGk1WbwyKZin0hVfJm1SIDz7a7AKNbCfL35_mZhiH8kve8maifa5pU4LAKtxwt.1nQ_C"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=919a8d35fb77498b';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, "\/abstracts\/search?q=shell%20nouns&__cf_chl_rt_tk=qnb6zAthUX87ANTkxHFoFeXD6wxyhaKGXX7Dl07HbA0-1740852002-1.0.1.1-5sO1zyvfPkd9XuByJAJdyj0oXKHz5lmijsMCbUEbegY" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>