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: '913577329d8af8fa',cH: 'FPnxCrbgGP_VFfpe6R4hUaY4WlhO8VPGqZnM.OAAkn0-1739792038-1.2.1.1-rBe2cFlUcyrjXm3nF01K2RW57icXWpJKKM5986kPXGO7gb3ASe6fGihq9CxF1BNt',cUPMDTk: "\/abstracts\/search?q=point%20queries&__cf_chl_tk=gKeSKEjQoDI5pz3Go4_M2idYBedCqJ8OIHCHU4Yho9Y-1739792038-1.0.1.1-4JVG9RqFtS3zbaza646Co3EriUhUXTkmPsieS7c1V2s",cFPWv: 'b',cITimeS: '1739792038',cTTimeMs: '1000',cMTimeMs: '120000',cTplC: 0,cTplV: 5,cTplB: 'cf',cK: "",fa: "\/abstracts\/search?q=point%20queries&__cf_chl_f_tk=gKeSKEjQoDI5pz3Go4_M2idYBedCqJ8OIHCHU4Yho9Y-1739792038-1.0.1.1-4JVG9RqFtS3zbaza646Co3EriUhUXTkmPsieS7c1V2s",md: "BYzw8yNNuRWaDDJlik_1O6XVm_qBDM.Na4okWK1HwlY-1739792038-1.2.1.1-QInLJMBlwPm_TzNDhXAqIlQhvA0cNoLER0FpADxmg3X8MoyfP2uGSEasBizaAN1nkT4LWA6MOz.hm.J_X4KyfmYW4PPvM0QP5ivx4DYu1VcQdXF6rDhVQgxLW0zDDX9jo3Evfy_yJZ0TSD07lVDDy720EhNjztHqfPgceRqgR46u.rvkMW8ZW1k1yeufh_j2IhhTpUTWkfVpbVxJjSWIiLcUi4fB95MHCLq.dvcN5inisI2W.T1QieggiyixP2geOkXtFEAuTWgwF0zBU2XpfXM_myh1SZqvQtgtiZZ58PWv.cEE0NYy_eIuLeupSsyZKK9Mj9wVR5ha4n3GTJnwKv_7OpKoZ98jRFm_QNy.0eYVEG1KFHN57._G1p3k0U26kHm_7H5Mcd6xF_08NuOfFGjuqYysVbxCDtLepN6YaBMLO0cpllzIl4MKXMPEtNZpDwm14sIw3dGIU8XQSu3xWlCkkfYbysSaf.Q9musgbVsWh4IECXFzRxVtKKCGQwDxuzDLsmAv5qkYPKZTRzyAYdB8SzKzGBuSWHG.1flhic5QZ1d3YyAHXNALrXUY72B9TSYRtBk6NJqJeTe0fuCvwa.wkvWez2oyLt0JZp4oMirF6scA4geZHOQjcxW5MebhXjJMdnjAVHxWOOeVa3dKuPbq65Mhu1LTduBofeXwaO546r4Pu53u6nNSzUYgHPXGJD2NMeX.hIny41uXl9T6yGlK6DVfxsCj4NHa7Vq4aOBNKGWQ2ZHMvMosoL1XtAJnNivKbi9enNLxG5EKj9HxavmNBMmUmV5QrrWGsGKhgo3SCnARuHl7VPADUI7V4Sn4AycevfB_rc6tVcuK8SoRH.x.DXzj8o8hGdgS.5mv0pyoGwWZHXlKuPYv.o.V.x1mA9fg65OVXNlMmTkS0sc4Z9cdY0hevZ6nkdPT9sPJGYtF2wDAff1LIAdRiXEe5tr3O9ybVvId54aXvrWERZWMv2Cbyad01mu.3Dq6xKIcXiFId3z3JPIwryfT3izMEv4n0J4CPxMsMqKMflR_aawtDjy204NAnq.PKk3_rO9remKwct6r5_SVqcM.sG_eh5O3GIqq5htD1NnXIJQ2.lEqkZzhFjwkDPi3fQSKC1Z4jbgTV3xiYJGb4.eEoRhdpQ2QDJlcYP7PWAEkV6ENN7V16tAdCwSiQWH8MikM58hvk0GcTB0j2VnUQcbOpuF1FR3_Lm2tb617OuCMeNsov6MSmZIKrbmt.1NIt_rkAX58cQaBWvf8FGFf6nOQ_mJ6x9NgvPvmszRYn3Qpq3fNOXj6RVuaNWjQ7YVnwYlX3nSlE312S6eNXJwVPUewpZTV2_VBcTw12VaBMyt1nngU7FDuW0iXLhhUmm0fvFBkforBnSc0yTcl4_M57vXtttCGC9w5PD4Y_c2WkYyJCON0I7FtgGZHsCjjjV3_ndHK9_WocE4D3uvpjJSvjw6QV4N5N0iV2c.wH6DCES4QZYDF1Kjt9X5e7Rk_lXz.jfIXmXrqqkSduEGLX7B.qthCJS_1hRIL1e_vzkfrf6DqD7YYXSNhC_MxjPbCC6cj4F9QNLK0leBbQmU5gZl7IbOlG1lZudsV2.ZyMwP8HoNMHVh06w.Mhb9X3jUWK5KNdgNg1XFK1E_uDhjj.hyD7ooXY22x83WIm6zK2mF5y.djwWKi0ERRDmzpKlRzt7Tk5W9stbr.mzsUW13lE2HaPmXv8PH.LC_E6DxEvgC8NqkF78fxJ_gYG.OrZoauX2.L7w3.XvneAji.Mg8sIA5xqCreglBbaV9DYrKsjWrkU3ckMh1oaWC1vLlcOjS4VuUo9rgJw_hX3yjWTYG3TkfXTatXv9WHYxZp8hbUhLJbMTwyhK4VNwa4bKlJitYMOxJOLjeYCEvuYW_VWUFDLilsymvUsEpfpSoPNOsf9AuQSwxG2eKxixFSnf_8U57LXbIY7heZngAHQ1M",mdrd: "SlvOqDKDAg7AdZ5CH0DSBvgzdglAMTqmrznwyNh3i.s-1739792038-1.2.1.1-jHhA.dCz0EQcPH8zuFPoqLzS1Ddo6_hH0cBxtT4Etmkw46W8HXXSNFQr77Mc6cehwO2H08xdXdEpD1XzEZ4Sr9gRI8yKcqXO3siRXjrftfyJgMIzR_gSvngiVPmUF.dpV75Fhmfm7YpcPnO3opsSDBStcbRE63sawJImh5oHIIzk4QgTb_A158pOsP9IkYYNQ8qjo.3h10CLqxeuKBjufEb9x7SnXdk3hmGrHLoSoC.fJbppTX06mgNkL35gC3MiXSPItzzvoT7JzJtKVoz1_64hEeG.31ShgNNrQPEvzXaTtPgmtlu6KqLjRGZsVUNorV36zbfiEPi9i0439hSLj7ymfUtRp5imub2KnWnYM1wwATAg0kGeinfDW_uFM._vTQD2cMkFbBmy3W2yLBCfjTdf.BwaDMbF.mqkIOQAFxWgg0rW5kUBa2aaRCOP_7SF.VYcmZu6pDVMISMD5PWlSPuMjIsl3zBq3lfBlQKUR.Q4qOo_9FBBLPWcE.L3iUOh_Tysm0fnZkkDw3Kz0SQOOO6LMINvWa4xGUirceAD_BKdCsz9kYpnXjVVcW9WCXproZUzRI_KuAJHrurrAxlw9iyQt0QGKo.2aIt7vFQ.W.99VqbuV223NBW96j8n7tdrrybq6elji3g3eTs0LYIR8cchELmcM0xibZlA2G35S..4LvFe2JaG6O1TmGFUsCYzSc1dfPlk7utaqF1UyyNcg.tiAVX20lAbxpscUvoVwLyeMvDuJrx1nhxJMGwItFAow15OFUzuAABiSO4dwpg5g6sWn4XTh8hwunYBU81flEInLG1yDLdTbJBwcu.p2PJVc_Wc24ETqXffPNTyNvlx2.u5dne.eNYO7zpGLF3EoaG4FqOM_Yd1eRtBQDsXkAlyfHWE07AgVhb8Rsz4FdKoqTYDJEGNB1wE7d0feTlVEllPEeE_TOmtx8DaCyUBdqvDo_ZAsU.DQ2SZHTpaPoHNa8AUHo.wFHHHKurWzuI3koHKr2501pdtzifS4EjS1gZIEdTjPB9OXvtzOvNUKi48yimhWik4nzy9V_jTHuNHB6QNXp_9zei.8ez7_yDU73Y16mPQyWxGkMtvkimkB8kLdbvcA6VkQVOaVyRqJ1PUVKglrKSfgyPnQt3.QkTgdMcERoicV4eggwgVeuuxnLPVpbyy.Kn5BqugxjW745u2SI9LMzImlUcOfzlkbJBRCFGi_EYbBOlag54S29ZbYpgFI9Msd0HNfdLjGHEvt9mzch9zeCmIEqXhUKNZzC4graoe0dcvfnuRDVyJkF__PIU62WGUuRuSjkWK0kRJHrM.jLns1ys81iz_a2_KlGvccsJlK7sW1u7ysWHt.eex5Yp6W7_lMWBKX2SKL4fApUyStY1AZEKrvWXlrbc0h1WBjdwknRhXNcWoqzDej3jeDTTnjz5ECXA9glwRU59C1ZLex4D_fTtLFEZwheHjclbbxCfrjC5_Lvv4RafAuSoVIne3jCpDl1wjXWMEc0u2Du1AkTiiYWhUAq6OcVNDzF1jS.aSVUNe_20QI16vpBB5AsNRJg8X1iUnIdTyUz5fXnmnjXX9wZWW5SLrqFxqRXGM51lXWQOqYy23Nj3ky0yYVW86SrMIIN.jqO8d.fuQhzy.Mx1jHBH2mgyAM7sKv53Lb8wBt0VgxCoTT8fT1oOW1iSEK6NIOK1l3jdGcnr8y1dyhHd9hXKMFbeOMt8B4cDwlHFdpiaFSXajMf48KrfyT8CdPGWQ01FSTDMXCUXs4Ho_hCIkU3QpX7INbLtkH7YoN.Am6_euopkNj8_lj1ajbKPCE1YZyKl2vPa7i13bmyrUxo7hMG.CFGxVd.1.OuDgwkok5.qufg4wptb6CX3LODNtEtbpfO6_TJwpHzlVgytGPvKHRZGK0Rs.GtgGAWz8px7bl1zCBWx3FTcgrWElTO_WD4E3RByOlAcbnHrV6yTPD2L9HMwHORxVcytc2iTQ0r3kPTysUaL1XJ8JBSN1VOaMJg"};var cpo = document.createElement('script');cpo.src = '/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=913577329d8af8fa';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=point%20queries&__cf_chl_rt_tk=gKeSKEjQoDI5pz3Go4_M2idYBedCqJ8OIHCHU4Yho9Y-1739792038-1.0.1.1-4JVG9RqFtS3zbaza646Co3EriUhUXTkmPsieS7c1V2s" + window._cf_chl_opt.cOgUHash);cpo.onload = function() {history.replaceState(null, null, ogU);}}document.getElementsByTagName('head')[0].appendChild(cpo);}());</script></body></html>