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: '913511dad99d4481',cH: '.mRdKY7WwCjI.KiAwt6GAy01KF3wWOBpb1FRryg8lrw-1739787887-1.2.1.1-QQw3.Ngv5KO9bxI1xLTo2zki37wbqD5o1zfNlT7woYWbZCpILbHXHt7UBVVfN2Ij',cUPMDTk: "\/search?q=positive%20solutions&__cf_chl_tk=TULXOHd0yEjLzV5.LwZvjumGC1HTRDI0fOqD4xOWUQE-1739787887-1.0.1.1-dG36EZw20V_urAIlv._mUSU5PGSKbmuHANv4YDIOSU8",cFPWv: 'b',cITimeS: '1739787887',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/search?q=positive%20solutions&__cf_chl_f_tk=TULXOHd0yEjLzV5.LwZvjumGC1HTRDI0fOqD4xOWUQE-1739787887-1.0.1.1-dG36EZw20V_urAIlv._mUSU5PGSKbmuHANv4YDIOSU8",md: "yZPfFpoPZDtv5HJRUF9K2lfR5v8EJX.y6EFrhi.kuyk-1739787887-1.2.1.1-WUSpyGwqSGO8eyGJV2Z1udChDdG.mBx2_EdsGluFRo62QeE_OT1MUSJphbVHx3pOaCwaFVNjOCP07FPiRsrLBL7_qxIx.AIyTjkKXaNGtKZzp..Wm2Z6yRnZNxmrIkM_HzY5YL7TaLMjZarqHPfRITnjbv_3m6Zrgv1j8QJYY5.aDqwEffoavseMwsD4UptG4Agh5qqKbL0XsPqYar7vPCnP4p96Nwj06cCHdMNYUpNOHNQNUR_M30Movj3RvvWyOnH4ThA.jT8kCul2poMJIVTgiftfv97ccOQydeJPrKZ_.K1fh3gMmyIZ0l1DY4UGS.cBn5PxVvCUi1yCyOU7NqR_ioGmTjAyyNqOddc_aH_g.nMhyDOCEimO6FiBzlnG6sFFLbeeCWF7k7lgKG_WSqzb2y.7HwNIoNTBaPuM0JjpUM44T4TtwS4qFT.xjzQ2i74ODFtop4GPQc.i2LXihwghngZKyeknCWCf.XrlfIAzfBsaLxekSRXoztEwPeWP6L7Dqod_Cy77bRkHOnpeM6YrK6UaPydmjFqAb53v1kM59rZmtc3YnSPXooMMuIT52w3kd12cvy2qeD0x0.jHXqFSqa89i_9b3nIjb287c0kw.NNx1kDm1jv38gi_IAyPp4SCitkEIXkQEoqI3ZLfqLau0R6yeomgJ38lCNJ0KQChH2P13lJhh058Hn5saWVuhed0SUnVnNSzKCt53SXHrG9QzeJKKmE1r2bZ2lFBzCXqKIYTp9GUGM8blKZoYPEF1PiCMdrR.pUboaYFK0O0jChe0zAMAwiJcm.KaiFvtiQDgN.QRKM0pAZZm0uGM6RlYngwdHcyvBntF12JrPiHabdG6J2pfMHPtkyw_M5gh7mAD0w7upR.NzxD3c.UR7OL7qCE2NXcFhtfVdwL6uyVh.cIedHjVItIJKVhR6rMOLE2mQ.91kPd311Fi1F2WtvNpYqTCcNmC8jitHqkpVYJmsAa1KahdIF96mEYc5oUql8Js_vKrhS21duhSzsQ9g.Q58L0hpKrRpZFE.VtALvk8oGalzAR6H9MH9wCMJTpRwDcMRPvJdJXsUZE1wr8OZZGFA8gBf2fqVFuzVNGhluBxTT73tdw6hU_uRmuauJ4ouUPhSa6etU8fnnyKbJWai01pPyBzVoIxWhChoQVoqHEgtz9s3xBrWrNP7ygH.Dxz6xd0lBBuFiEJLM1zGnLgcCGfhmz0IQhVj3HAHsehyhjNSja5yH33rmf3R7Z5B_YgtZWhqe6vzM6TBDeQnMGzicScwGwzjvqenta_4k0e1bvG3T66sTlAt_lGPG87k2ixROkhLrK6FqTzKN58lM4sbT89wQFEIjhS5VP.aEurQ5eVVbmj7GO85ZpdwkU6CcrZG_VIh93Cy61WOCfK8SIbcYnnr9uTc2b3mRlsKBlnU3tw_T0XnWDVAvQhorfc2eDCd9KCMnu4mfpArjA8pPHuhAXypbIKbNAfeMCcebKQJu76XZooKMaAfoqPVH2UCGG_.lz1XGPvrc8qkzKBrdB4rOCtCx5mNwzeHpcQ_53fB4fzTK04zwGC6uOPX.LNeXse8d6Pg1o7x1l3epL3sXd.B.a.SpoVxAmzFTxoMgHuN_SXdu.Ao_k6BYo8Sf1YtlZ6jnu_6mjPgPvN0tv74ofBYkhcyLyz0lca3kZY.WFuTRM1eYRgVmxcUe4InYQ_gB6gmGsdDc9bnGjZB4ZKuZXzBaRi_wcq.kxCwg74dzhSxBp2EeIHTe3xLxO0zjxypyjHGCXCWB.NJVrgRUPUVClBz28wOxTlp3_bSH71Zpy.PG_48O5PbWoeA5q34hrL7RclzUsfpTZUc_oUDxU579ogXpLBMOc6SWWaRimSuUGmeoQqHIiTVpd8zqxdCv8pXPScPiX0fnLZATvfs4MwlY4GRt.6bBKlSoR30bBfRib98Le8Q",mdrd: "39KRYgHPOyx2kpR4SprNTjYd1q2J0oY3ykngweYPnFo-1739787887-1.2.1.1-NLMUok5iYw7SRr7QGPAU3YIawnxcRrBh_DT9A2Je0.NUYB9vzjv6_jqMIFRE31iNdh9kJp_Y8k5U6Z0xtISV7DpcvUCamj8rxBv7k6p2Y8rsSBIpRh7C1FQdCVKOs20qQuASx3S7gfoTMADncHUu8rdywaWhSZ2p6D4BEqjyOlmUiFqdW4bby0fdXVO8j.Xanx8XxqyQ2837yjLF7rjFlbxs_5Md7k6mwba3p3YlVrOdPoano38KRAS6Aabkr_.cHmPUUCB1pomYFrB79NSoc1iloMbwlaG6jEysjXO72ai43GOma4KerdGeClag.PuYHrCWgF2Wy8xTDaC4xU3rtCB7JXQgv6af6FHXwjYLnpFq6Sobkt3VaENakStDLG3bGANybRVFrs5YhEzhkM9dMSBETVP5G4OSq9ZyBkbinvPJBZ7RMEBDZlH1BeXxxaxjohYTECZTf88CqpKeIyTg_JxwlmZcOYubKHa2B6zcTvbmQyeUT91OgkY6JOt9lrVXlB5rM1QY4p1nMGDT5wOVHgfB6sEZ67nLEcR_mbyVeWK_0wYORSfCkOo.qcKOo4eKrwnkpRh_bqi9nVyrhOnWMtqbWOdibuOxUnnvuS1rJF3eoUiGV0qVnV7ZaC7TmtuAhtDnofRJJqnkMgXCJWZX7E4v0pqWRlQ_MbFlF_JQFoLRgnwDfxPUkbr5m34xNV7cFTUxzU7DtZgwcf5I.58fv6xpZUe9tb3K6pceT0vkDgVVSqZqk9eoHGs6W71PhMgRhbwTzkMxRJhH.bnL6.CdU77xZ4Gq81sMnNIip89dH6t0QXBx8VKq6rACHrjOweyXB_yRzxr7B04msIw6w199bV5UyvGRE_GH1tK_B9yRktZaR0WJBQB8tzYi.d4yIA.qDjh3QosSnh3kiQT6_t4V0CR8txqFZFXjRTsN338U8MtO66XKwgPBvSsys4vnyr3uzmWnoCh41swf2Urrev_McPwtCYQdk9NFsW9tqFMv9CQswTG2kfCK0.zREZMr3u4UnCgcsS3gauQDZefU3DfXl2t55AvRu6Q0ADK5opeHeSGvkoXumBjggXJQVmld6qBzc9JijHcGom7uLtuv38Xhbxn6pmAn2Pz4Ot11hxtMj_57XecUpHld9ggOcABVWz42N4RCN5XRILlAcD5hvnM7fdmMJufdwV2Sfg9wO2nyQHJ6Ssv5cjvOwQRLuR.wcFG2Unm2vVmg4DS3avzW6oNz9kqcqBCzjs7.xQTH0l_iTfFfpXnNXW0.H8ec5mlmpSS2Ycf5OgTIdZ9zxFJqmVM1254c5XXE.37iIxHxRNtMzRvRZK8z6HaP2TSFOdy7WjiYR0jagIWOwhvtLvkfPYDonOXHiDydsNewEZgbsLlrRXWAJqcRgtPYh.HoePkKWEMPat8frEVlpnWuaxHG4RX7gD8MhFdpH.2Eyf12w_lRgfeh1mvRNwKFviGC7vyTpUJsCQD1D1.nHlrlMe6w8B_YIGIMu7RcHLyeVuYporXjhs9uUiy2JLAFgCjNdAD72lWtK17bJdcRO3kZyeruRPkK0wbtKRJ.z0kzU.sNFTjtJ76xJQlgPSYxJ1t3eDTHrb2wJjiNdlV.mQv31hd48ynkZqkAV1tnv2JzAP508AtQqcR31I2mXePEDpyGASIkxkNEbrYLRW6uBRpPbzU3_zOGjoQ3An7xD4BJph2sPFw.Ugv1XHgeSZHee1VeIuiLzJeubogLuzKeQevMSP0FYfWZXscPVWnXIG_2w2HtktCEyDDSr82prtx4bgvXGlpCmbrdqoUssPQkZcU9WEpBgcTS9MxNLLNtbUZ3kcIOo9JR1gwiRWNr6E5kh.vXj_35sxVWDqducA8wkda6F1AjW1mNwYwxhZEbHOvURWhbAan1U1oo9Z3NQTA7yFA4HCoCX0gix6HitBBv65TvwdzsYShsuaeam2P3w84mxMhThd2m_Re8Yrfm6oO5Q_IFD99A.qfd_TDKQTof_z.eWVj4wKwpkA"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=913511dad99d4481';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=positive%20solutions&__cf_chl_rt_tk=TULXOHd0yEjLzV5.LwZvjumGC1HTRDI0fOqD4xOWUQE-1739787887-1.0.1.1-dG36EZw20V_urAIlv._mUSU5PGSKbmuHANv4YDIOSU8" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>