{"id":98388,"date":"2025-06-22T22:21:39","date_gmt":"2025-06-22T19:21:39","guid":{"rendered":"https:\/\/www.lovendal.ro\/wp52\/?p=98388"},"modified":"2025-06-22T22:21:39","modified_gmt":"2025-06-22T19:21:39","slug":"oamenii-de-stiinta-redefinesc-timpul-insusi-incepand-cu-secunda-totul-cu-ajutorul-ceasurilor-optice-incredibil-de-precise","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/oamenii-de-stiinta-redefinesc-timpul-insusi-incepand-cu-secunda-totul-cu-ajutorul-ceasurilor-optice-incredibil-de-precise\/","title":{"rendered":"Oamenii de \u0219tiin\u021b\u0103 redefinesc timpul \u00eensu\u0219i, \u00eencep\u00e2nd cu secunda. Totul cu ajutorul ceasurilor optice, incredibil de precise&#8230;"},"content":{"rendered":"<figure id=\"attachment_98389\" aria-describedby=\"caption-attachment-98389\" style=\"width: 351px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/06\/ceas.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-98389\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/06\/ceas.jpg\" alt=\"\" width=\"361\" height=\"240\" srcset=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/06\/ceas.jpg 541w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/06\/ceas-300x200.jpg 300w\" sizes=\"auto, (max-width: 361px) 100vw, 361px\" \/><\/a><figcaption id=\"caption-attachment-98389\" class=\"wp-caption-text\"><strong>Imagine<\/strong>: <a href=\"https:\/\/pixabay.com\/illustrations\/time-clock-head-woman-face-view-1739629\/\" target=\"_blank\" rel=\"noopener\"><strong>pixabay.com<\/strong><\/a> (Commons Creative &#8211; free)<\/figcaption><\/figure>\n<p>Oamenii de \u0219tiin\u021b\u0103 au f\u0103cut un pas important c\u0103tre obiectivul global ambi\u021bios de &#8222;redefinire a secundei&#8221; p\u00e2n\u0103 la sf\u00e2r\u0219itul acestui deceniu (2029). Un studiu publicat recent detaliaz\u0103 modul \u00een care cercet\u0103tori din 6 \u021b\u0103ri diferite au comparat simultan m\u0103sur\u0103torile de la 10 ceasuri optice &#8211; o form\u0103 avansat\u0103 de m\u0103surare a timpului care este de p\u00e2n\u0103 la 100 de ori mai precis\u0103 dec\u00e2t cele mai bune ceasuri de cesiu &#8211; care sunt utilizate \u00een prezent ca standard global.<\/p>\n<p>M\u0103sur\u0103torile reprezint\u0103 cea mai mare compara\u021bie coordonat\u0103 a ceasurilor optice de p\u00e2n\u0103 acum \u0219i au redus semnificativ incertitudinea dintre m\u0103sur\u0103torile raportate \u00een studiile anterioare. Aceasta \u00eenseamn\u0103, de asemenea, c\u0103 ceasurile optice sunt mai aproape ca niciodat\u0103 de a deveni noul standard pentru m\u0103surarea timpului, o schimbare care ar putea avea un efect de domino masiv asupra tuturor lucrurilor, de la meteorologie la \u00een\u021belegerea noastr\u0103 a fizicii fundamentale. Cercet\u0103torii spun c\u0103 descoperirile sus\u021bin progresul c\u0103tre o redefinire a secundei \u0219i utilizarea standardelor optice pentru scalele de timp interna\u021bionale.<\/p>\n<p>Dar, ce sunt ceasurile optice? Pe scurt, ceasurile optice sunt instrumente incredibil de precise care m\u0103soar\u0103 frecven\u021ba atomilor dup\u0103 ce au fost excita\u021bi de lasere. Atomii sunt mai \u00eent\u00e2i r\u0103ci\u021bi aproape de zero absolut, apoi laserele sunt folosite pentru a le detecta vibra\u021biile. Aceste vibra\u021bii se numesc raporturi de frecven\u021b\u0103. Aceast\u0103 frecven\u021b\u0103 precis\u0103 corespunde apoi &#8222;tic\u0103itului&#8221; unei secunde. Oamenii de \u0219tiin\u021b\u0103 cred c\u0103 aceast\u0103 metod\u0103 produce rezultate mult mai precise dec\u00e2t ceasurile atomice cu cesiu, care au fost standardul global \u00een ultimele 5 decenii. Pentru context, cercet\u0103torii spun c\u0103 un ceas optic nu ar c\u00e2\u0219tiga sau pierde o secund\u0103 timp de miliarde de ani.<\/p>\n<p>Ceasurile optice sunt incredibil de precise, dar sunt \u0219i extrem de complexe. Exist\u0103 doar aproximativ 100 de exemplare \u00een \u00eentreaga lume, \u00een mare parte pentru c\u0103 sunt dificil de construit, operat \u0219i \u00eentre\u021binut &#8211; sunt, de asemenea, susceptibile la defectare. Compararea lor \u00eentre ele este notoriu de dificil\u0103. Diferite ceasuri m\u0103soar\u0103 frecven\u021bele diferitelor tipuri de atomi, fiecare cu propria sa frecven\u021b\u0103 unic\u0103. Aceasta \u00eenseamn\u0103 c\u0103 singura modalitate de a stabili un standard consistent \u0219i extrem de precis este de a compara direct ceasurile \u00eentre ele.<\/p>\n<p>Cercet\u0103tori din Finlanda, Fran\u021ba, Germania, Italia, Marea Britanie \u0219i Japonia au colaborat la un proiect condus de o comunitate european\u0103, numit <strong>ROCIT<\/strong>, pentru a compara 10 ceasuri diferite. M\u0103sur\u0103torile au fost efectuate pe o perioad\u0103 de 45 de zile \u00een 2022. \u00cen trecut, compara\u021biile de ceasuri optice la scar\u0103 mai mic\u0103 se bazau pe leg\u0103turi prin satelit pentru a m\u0103sura diferen\u021bele, dar acest studiu a folosit at\u00e2t leg\u0103turi prin satelit, c\u00e2t \u0219i cabluri cu fibr\u0103 optic\u0103. Acest lucru este important deoarece permite m\u0103sur\u0103tori mai precise.<\/p>\n<p>Cercet\u0103torii au efectuat o compara\u021bie coordonat\u0103 extins\u0103 a ceasurilor optice, inclusiv a acestui ceas optic cu ioni de yterbiu de la NPL. Experimentul este un pas c\u0103tre utilizarea ceasurilor optice pentru m\u0103surarea timpului la nivel interna\u021bional.<\/p>\n<p>De\u0219i sunt necesare mai multe compara\u021bii \u00eenainte ca ceasurile optice s\u0103 poat\u0103 deveni oficial standardul global, cercet\u0103torii sunt optimi\u0219ti \u00een ceea ce prive\u0219te viitorul. Beneficiile merg dincolo de simpla \u00eembun\u0103t\u0103\u021bire a m\u0103sur\u0103rii timpului. M\u0103sur\u0103tori mai precise ar putea ajuta oamenii de \u0219tiin\u021b\u0103 s\u0103 testeze teoria relativit\u0103\u021bii a lui Albert Einstein cu o acurate\u021be mai mare \u0219i s\u0103 ofere noi perspective asupra conceptului \u00eenc\u0103 misterios al materiei \u00eentunecate.<\/p>\n<p><strong>Sursa<\/strong>: studiul \u015ftiin\u0163ific <a href=\"https:\/\/opg.optica.org\/optica\/fulltext.cfm?uri=optica-12-6-843&amp;id=572911\" target=\"_blank\" rel=\"noopener\"><strong>&#8222;Coordinated international comparisons between optical clocks connected via fiber and satellite links&#8221; \/ optica.org<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Oamenii de \u0219tiin\u021b\u0103 au f\u0103cut un pas important c\u0103tre obiectivul global ambi\u021bios de &#8222;redefinire a secundei&#8221; p\u00e2n\u0103 la sf\u00e2r\u0219itul acestui deceniu (2029). Un studiu publicat recent detaliaz\u0103 modul \u00een care cercet\u0103tori din 6 \u021b\u0103ri diferite au comparat simultan m\u0103sur\u0103torile de &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Oamenii de \u0219tiin\u021b\u0103 redefinesc timpul \u00eensu\u0219i, \u00eencep\u00e2nd cu secunda. Totul cu ajutorul ceasurilor optice, incredibil de precise&#8230;\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/oamenii-de-stiinta-redefinesc-timpul-insusi-incepand-cu-secunda-totul-cu-ajutorul-ceasurilor-optice-incredibil-de-precise\/#more-98388\" aria-label=\"Cite\u0219te mai multe despre Oamenii de \u0219tiin\u021b\u0103 redefinesc timpul \u00eensu\u0219i, \u00eencep\u00e2nd cu secunda. Totul cu ajutorul ceasurilor optice, incredibil de precise&#8230;\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":98389,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[106],"tags":[346,1213,19983,12344,610,7110,1304,202,203,86,128,2634,392,1809,600,16356,9803,789,9486],"class_list":["post-98388","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-stiinta","tag-atomi","tag-ceas","tag-ceas-optic","tag-cesiu","tag-einstein","tag-fibra-optica","tag-finlanda","tag-franta","tag-germania","tag-italia","tag-japonia","tag-laser","tag-marea-britanie","tag-materie-intunecata","tag-satelit","tag-secunde","tag-stiinta","tag-timp","tag-vibratii","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Oamenii de \u0219tiin\u021b\u0103 redefinesc timpul \u00eensu\u0219i, \u00eencep\u00e2nd cu secunda. 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