{"id":260740,"date":"2019-12-03T11:21:16","date_gmt":"2019-12-03T10:21:16","guid":{"rendered":"http:\/\/kapitalis.com\/tunisie\/?p=260740"},"modified":"2019-12-03T12:02:45","modified_gmt":"2019-12-03T11:02:45","slug":"le-tunisien-wassim-dhaouadi-diplome-de-lecole-polytechnique-federale-de-lausanne-resout-une-enigme-vieille-de-100-ans","status":"publish","type":"post","link":"https:\/\/kapitalis.com\/tunisie\/2019\/12\/03\/le-tunisien-wassim-dhaouadi-diplome-de-lecole-polytechnique-federale-de-lausanne-resout-une-enigme-vieille-de-100-ans\/","title":{"rendered":"Le Tunisien Wassim Dhaouadi, dipl\u00f4m\u00e9 de l\u2019Ecole polytechnique f\u00e9d\u00e9rale de Lausanne, r\u00e9sout une \u00e9nigme vieille de 100 ans !"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"http:\/\/kapitalis.com\/tunisie\/wp-content\/uploads\/2019\/12\/Wassim-Dhaouadi-EPFL.jpg\" alt=\"\" class=\"wp-image-260755\"\/><\/figure>\n\n\n\n<p><em><strong>Une \u00e9nigme de physique, vieille de 100 ans, a \u00e9t\u00e9 r\u00e9solue par le Tunisien Wassim Dhaouadi, \u00e9tudiant en Bachelor au sein du Laboratoire de m\u00e9canique des interfaces souples (EMSI), dipl\u00f4m\u00e9 de l\u2019Ecole polytechnique f\u00e9d\u00e9rale de Lausanne (EPFL).<\/strong><\/em><\/p>\n\n\n\n<!--more-->\n\n\n\n<p>C&rsquo;est ce qu&rsquo;a annonc\u00e9 aujourd&rsquo;hui, mardi 3 d\u00e9cembre 2019, l&rsquo;ambassade de Suisse en Tunisie, citant un article de <a href=\"https:\/\/actu.epfl.ch\/news\/un-etudiant-de-l-epfl-resout-une-enigme-physique-v\/?fbclid=IwAR18nRmlf_jWT9GRT6DIGmeohBGQ-n5rCdn8YEs0rtVhP53m5WEe0YkyNps\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"l'Ecole polytechnique (s\u2019ouvre dans un nouvel onglet)\">l&rsquo;Ecole polytechnique<\/a>, qui se f\u00e9licite du succ\u00e8s de son \u00e9tudiant, qui avait, en 2018, re\u00e7u le Prix de la meilleure moyenne toutes sections confondues pour son Bachelor en G\u00e9nie M\u00e9canique au sein de l\u2019EPFL.<\/p>\n\n\n\n<p>\u00ab<em>Il est courant d\u2019observer, dans un verre d\u2019eau, les bulles d\u2019air se diriger naturellement vers la surface du liquide. Ce ph\u00e9nom\u00e8ne est facile \u00e0 expliquer avec les lois de la physique classique. Cependant, ces m\u00eames lois n\u2019expliquent pas pourquoi une bulle plac\u00e9e dans un tube \u00e9troit de quelques millim\u00e8tres de diam\u00e8tre ne parvient plus \u00e0 monter, mais reste coinc\u00e9e et immobile<\/em>\u00bb, explique l&rsquo;EPFL, en ajoutant que le scientifique Francis Bretherton et autres th\u00e9oriciens ont tent\u00e9 d\u2019expliquer ce ph\u00e9nom\u00e8ne, mais en vain : \u00ab<em>aucune de ces th\u00e9ories n\u2019expliquait les m\u00e9canismes en jeu de fa\u00e7on compl\u00e8te<\/em>\u00bb.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/kapitalis.com\/tunisie\/wp-content\/uploads\/2019\/12\/John-Kolinski-Wassim-Dhaouadi.jpg\" alt=\"\" class=\"wp-image-260756\" width=\"500\" height=\"352\"\/><figcaption><em>John Kolinski et Wassim Dhaouadi <\/em>.<\/figcaption><\/figure><\/div>\n\n\n\n<p>Mais apr\u00e8s un si\u00e8cle, le jeune Tunisien Wassim l&rsquo;a fait via son \u00e9tude supervis\u00e9e par John Kolinski,<em> <\/em>charg\u00e9 du laboratoire de m\u00e9canique des interfaces souples EMSI : \u00ab<em>Sa recherche d\u00e9voile les m\u00e9canismes \u00e0 l\u2019\u0153uvre lorsqu\u2019une bulle de gaz reste coll\u00e9e aux parois d\u2019un tube vertical \u00e9troit. Le chercheur a pu mesurer exp\u00e9rimentalement la pr\u00e9sence d\u2019un film de liquide ultra-fin entre la bulle et le bord du tube. L\u2019\u00e9tude montre par ailleurs que la bulle n\u2019est pas coinc\u00e9e, mais qu\u2019elle \u00e9volue de mani\u00e8re extraordinairement lente<\/em>\u00bb.<\/p>\n\n\n\n<p>L&rsquo;EPFL a \u00e9galement annonc\u00e9 que cette d\u00e9couverte a \u00e9t\u00e9 publi\u00e9e dans le <em>\u00ab\u00a0Physical Review Fluids\u00a0\u00bb<\/em> : \u00ab<em>Un joli succ\u00e8s pour Wassim, qui avait rejoint le laboratoire en tant qu\u2019assistant de recherche, puis a continu\u00e9 sa recherche sur une base purement volontaire. Bien que fondamentale, la recherche pourrait se r\u00e9v\u00e9ler int\u00e9ressante pour \u00e9tudier les ph\u00e9nom\u00e8nes des fluides \u00e0 l\u2019\u00e9chelle nanom\u00e9trique, dans des syst\u00e8mes biologiques, notamment<\/em>\u00bb.<\/p>\n\n\n\n<p class=\"has-text-align-right\"><strong>Y. N.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Une \u00e9nigme de physique, vieille de 100 ans, a \u00e9t\u00e9 r\u00e9solue par le Tunisien Wassim Dhaouadi, \u00e9tudiant en Bachelor au sein du Laboratoire de m\u00e9canique des interfaces souples (EMSI), dipl\u00f4m\u00e9 de l\u2019Ecole polytechnique f\u00e9d\u00e9rale de Lausanne (EPFL).<\/p>\n","protected":false},"author":6,"featured_media":260755,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[998,2433],"tags":[1469,931],"class_list":["post-260740","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-societe","category-tunisie","tag-etudiant","tag-tunisien"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Le Tunisien Wassim Dhaouadi, dipl\u00f4m\u00e9 de l\u2019Ecole polytechnique f\u00e9d\u00e9rale de Lausanne, r\u00e9sout une \u00e9nigme vieille de 100 ans ! 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