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: '917731284da237b5',cH: 'S6U_MLl8GwUpHmeSb4JHc1bs4YNGdsFxvqaRuXlVst4-1740481230-1.2.1.1-Xd0NEZeXkvxSQJoq.Ipu7b5mj98C2tRx.W5Igor.hNL4kTU.XyEwmEDysY.SGjEw',cUPMDTk: "\/abstracts\/search?q=counterfeit%20coins&__cf_chl_tk=Ui4ovPOm88rt2JGY49gAyZl3SoU3MLHnzcRqnL3vG_c-1740481230-1.0.1.1-sKQGg4pQdZzahcffLnJlmb0XmfngjXICo2V39l1yJAM",cFPWv: 'b',cITimeS: '1740481230',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/abstracts\/search?q=counterfeit%20coins&__cf_chl_f_tk=Ui4ovPOm88rt2JGY49gAyZl3SoU3MLHnzcRqnL3vG_c-1740481230-1.0.1.1-sKQGg4pQdZzahcffLnJlmb0XmfngjXICo2V39l1yJAM",md: "k1jfsLz8gR_TFpp4CRJn7UbTZtzleWO6ac9EN.9.6hs-1740481230-1.2.1.1-uF19kxd1EBQVPavK0KA6uCUmdJ12TEvKzH0Qrv9LlIqv3pVcijgbdG0hGKBZ8rQiNQGVgNRQMd_GfzxIZEfpygKjZju6AwGZJX3KH5AqOkWRNPHaOWidAiv7HxQteotsW0DGw6HJZltypEVPN2kOfTTVo.tUxSFqVFOS9qLFCwF8nLZZ2.QHkdNA1qv96VHaw0F6BmOwnpvUo2c7z6yb5ir10nazJA1HLAonlAYewCH3c9WUpwmPo74n3JPuEuJBE1qo1Ppb0.eE_fJDplnWS9MFCaDn5hxXUSFuTt530MUVCqgv0Hdhau9q0NUVRjOc0bZ8JgoToWvRJkYygAYgoWCb2CHotZBMrJqx2hwh6XwG5bfHxCx5eXV21.VJqGAXthdDTVsnUbqd589WVjllOLH8YQrRYW4edJxxCKWURSrHOlvpk6Ai2CcLRz9JUFD9xwS541W0MHmwr7ms6Gu.r_i7NiTNaIfRVn89g2A.Nc2WCsJMVU7KJVueBx_cm2dWChdy4YCvTe1lML44oFrmiNPcVW4jpiPmw9VLe8nszIFCT7znfaq.XmW.Lw7XqYsBSWtTMnkdHAJCh.N3KYj_Sb9gv8HxjS3WkE880CYchaTlT4A2o3NsTdPhKIR8Wr2FK.be45TwulZBWPAAUzfga8pTGKHDXGQOu07539cJ2cuqnVY96SD8uv5ypRwURfrSbs22CFxyjoCuFC9_d7DPB98QINpUjs2PovgaHZcBOVALcOIf5QeLCYvXGdm3ZFnWg8mNEtX1Gz8roGeBNhLHRq.L72Ch8NUTyeP_4.p5b4ubbgfZifgHA9Zv.4vrl6.i8EPgYL5TI7d9dGW42I3Iec6v_wf5qN6tVs3Fk8D08X3eL3iC3xmxoDP3gLCBawgXr5jR0ZYeH8aBaZn4g54g_EhOlht0BCJMWvTiy19UcsP4Mc2Sg_TGvveUiM7WaoqR_Qb.gnoZeRYK1UR8i5xXuMNy6_vxNCFnXEWHh71s.HbadiDg5oEVp8zqy3Ok5.uf06NUFyL1mjTUmgcfQodrutUuktj6h6txCYzlqw2ZYTPU6tKoZILifYRKzePcfQiQ3SlLucZgC6POuyOWNcUEocq3HeEcP3WLO6jGbVyUmSYOa5DUCs615WPXBQI3X7hqFHFsyPrnQsfX.tExu_IQmKme5vS0Nlp1Djsb7.VqZcKhNA6poP91AbqJXTdYIHChtkfWczqLFjufIysuhZFk52tCJ9zrqUofHihFs6FNm.YB9hexV6i_VZSAuyKT.YgjmIJctFc3wnxMhBzNoHwLtczhkj7eHJ012nwm3yoM94yTvzjTYkV94PvQxXulY5_ZwiH3UFiJjjqFiykkiZrU58LJI65jYJqBL.Nt5n.X7fDvA7P9SPhf97PyLMKUvp04l.Cd5sdb3bXCyNWHFwnaGNm0t2pG_1mw5EOFR5GjC3ZUY6WiYYFwHu3q9Ds6xA8PMMhTD9kBBpPNpB4eJuCqD37zGqwWKZbkbipVRlG3XpijIG1o1ecghSkMvlEcAFIHhhgrhrJhFABqyWf8p3rmRFkfVFKmsVOgu.Sc.7AugngNN_22Da17YLE9.sNUF6QEDFRf.KTuTnV3QnCpVeM6V2AY.1IbhtFp.13O2k0fHrDZSCedG9IFNRflnsND4riFgh6SJawaH5OXFkMobSE3enZUIX3AEiEvsfLJB1n8MWEEs6U61ESwY_tKgHW9foWOn8HzsbMFbZdfL8GwmUhPQoueWuqUzOyNLLmaVfRwWq4Gyp2udqtP_SY28f1SF2B5urXdeHvAJS4uudxokqfps1sSQ1FYfnTv_NQAtbRUlu5LpHXQxGOGYoqvlEuUj3z.nQJwt26H.t_OTPP2guQB44hst.DD32N5vpzZcouBp6n7geih8R_qIuWKN8SwR.6c6In9biQ5IsTPRakRemetx0ydPklRIYmf5KXAIwNW0Z4",mdrd: "ywfT4TpvGsPWbVojV6ZZPEWQWP28pClH8lNsE_4e8gY-1740481230-1.2.1.1-62StCMtj.Kx4OO.NjkaWcQQTQDbj9U6F59Dv9_RPZkTxCKNpLx2BWb7n4K1pQXNNI2Zs3ZWYjhXZo5RCZM0DYIGvX90aGXWBtw4Rz8VRUpevPiGGI2fSpukJXUrdzVuNdG5NK3t9YI8rDxqfD_Ab.xvY3hrARHal8g1ESBVqwSvdNgpwfImmBFbX.Cxtze.h5Pc8P_eKJrLNvrGg6dw.tT8mrW7__C4irLFJY7GyloAZ0kd8pPltC0GalZScbcv0hR41_1C0yuk5Ud8logKFhz9BCXsW3Rhi8mGg1.wDa6ZTgd_uRz68G6u29bkgZV_309wumz3iQlIjqLdKxRKaQ4_nlGq6XU8cyjgwf4HRLvma57ZNbDDOd5RrU.sknOyxps_WaATFD8rqJ9.I7HYCWV02t9VQToD0kWQ07M5NV0LULyhfkq.hBQeNUZxbu97YrCMqenQw8Tot0eomqNXqRnU1k83xTUDJGtI6pEXBwab2Ku75ak_nW99pX4MeauoAUvx.TdKXAB3wbFJu2uBU7665M30pz7K9Psp6KRMAQO4SA_wWEzPNyUvK.bQmfdP3n1qD65swLgaBshAEyZzhmrT52WPtqfOOzHNnEGzEqDO4BFHOMg_9odJrmaQHHq_ooMHPZ9AluvcwndY9DhNb4DyW2VQw8qEkOleSasDMRMyQjdBMGkUMfX.G.nN8AteBcpvlAJ_WuMBkjGvZlJ0j8rzsszd3Hfl6lB.ENK_je1WgGBzbizvWFrIaHZT7_J2yu4xuP3YibYu8dt4qNaIJiQkm_NYnaGoEEL7DlEn_pfCjhDi7aUsARPfZaPn_biWr4.soNS_u_Rruof7zn5yJHKf1884adq0dpalGppfkCFZHn3sD0O3raD1BMAFtAK5MSsLej9eNAqa_NkSlaGwbTJM4iJP6WGinNMytWfiJiCqNTi6cxxRXksoDeqhDWYNQtrrrfBrYWBfVYxB.Yis5jsWgGAxeF7BELfT6BjUkfiLBvCBDFzuYSjxzb5or.WsiWr5VpRyIj4miZVNBgRlgLSP4.y24XW2dH.UvZyJ1cxCbyW0gpeh0u5krq5x8_7kLnF2rdBSFdWgbdxnqBs7fQzOfKNTZM7dICIuYHTUGYNa6j.p0NtaODZWsdRc3u2BsgxJqMX_DfjsW7rv6MGL4bVZo8Ru69JCLo.ZvEiD5R9Ch0QQ3eBg9QrkDdO4KF8jjc2b4pJfFhaO5oLCN1jevQxzJO1lddJDJLHvvSFbJcNuL4NAf5BA3YRT2FIxswumL4nAjyBe3QnDirU7TqC1IaF09P7BXKFONXsUe4AKFvLaOpEpwb.gCp43EEgMof9xdT7gSGvGFhZVx11Ubx_BvH8_TSz9BdHqk8kvD9QTm.kslqcG3ZarsJojw8NLwxrN78sYsEczcwoyrPWLqeHVmcBExtt4bYJf1kUjYG1MDumUhPNCN7fRbsGhRYEld3eHLSOAwTRLWCa31bi5pMqdQrwkyQDrtJh1hiRKbsqpCD4Jy3TO43KGU7aSzHXfFwCHGpyVEhz8JiJKQz8anhowq.u8DJwMPaGkhv00UI49bIoMpd9T7CyCjkSN1hQnoUXAZH7bUGMwTY.nqCbaVbhMQTF29UTGL0dry2AGWV.JY1xmy63Jrmhz3QXg4DjgR4ysjT4PpE6tKNRFtoYOQ4DhsWlHRTUlU.K8hfwXtlYYmhdzKayxiWvcKsIsDkf6SPcCyPGUcE37ITTR601F5wBeQKnLfb051nV3e8b9.PwhG.kWwrZiwKU7zvYri0nCA1dWu1zSZodWk3DfhhpnVzYWcKn.DVZudD770mLX_ZLBrSVOzy8lW5w1vIgP8.5IKYDXazg2_Wotojmh8jV1tDd79Z4An3cOYrX2NpSdUAqO74ImETcP4UtPT_lDoAZovV9L_pzzXipDG5lDcFse1DlJF127qUOn3dWv2DbbGYEuwWB80kRBZwDmpIjbmCISNPxnKSv_6K9WbZdUwYkOheynKHg"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=917731284da237b5';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=counterfeit%20coins&__cf_chl_rt_tk=Ui4ovPOm88rt2JGY49gAyZl3SoU3MLHnzcRqnL3vG_c-1740481230-1.0.1.1-sKQGg4pQdZzahcffLnJlmb0XmfngjXICo2V39l1yJAM" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>