{"id":15360,"date":"2023-07-15T15:34:04","date_gmt":"2023-07-15T15:34:04","guid":{"rendered":"https:\/\/www.africa-press.net\/djibouti\/politique\/de-lair-ionise-comme-barriere-antibruit"},"modified":"2023-07-25T16:44:22","modified_gmt":"2023-07-25T16:44:22","slug":"de-lair-ionise-comme-barriere-antibruit","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/de-lair-ionise-comme-barriere-antibruit","title":{"rendered":"De l&rsquo;air ionis\u00e9 comme barri\u00e8re antibruit"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Djibouti. <\/strong><\/span>Cet article est extrait du mensuel Sciences et Avenir &#8211; La Recherche n\u00b0917-918, date\u0301 juillet-aou\u0302t 2023.<\/p>\n<p>Simple, efficace et surtout tre\u0300s compacte, une technologie de\u0301veloppe\u0301e a\u0300 l&rsquo;E\u0301cole polytechnique fe\u0301de\u0301rale de Lausanne (Suisse) apparai\u0302t tre\u0300s prometteuse pour supprimer activement les sons.<\/p>\n<p><b>Ioniser l&rsquo;air pour cre\u0301er une fine couche de plasma antibruit<\/b><\/p>\n<p>Elle consiste a\u0300 ioniser l&rsquo;air pour cre\u0301er une fine couche de plasma antibruit. Concre\u0300tement, entre deux e\u0301lectrodes se\u0301pare\u0301es par une fine couche d&rsquo;air, les particules atmosphe\u0301riques se retrouvent e\u0301lectriquement charge\u0301es, a\u0300 l&rsquo;e\u0301tat de plasma et interagissent avec les ondes acoustiques jusqu&rsquo;a\u0300 les annihiler.<\/p>\n<p><b> Une couche de plasma qui absorbe aussi bien les sons qu&rsquo;un mur antibruit<\/b><\/p>\n<p>Contrairement aux autres dispositifs de re\u0301duction active des bruits, celui-ci ne comporte pas de membranes vibrantes, inefficaces pour les hautes fre\u0301quences (kilohertz). Et pour les basses fre\u0301quences (d&rsquo;une vingtaine de hertz, par exemple), une couche de plasma de 17 millime\u0300tres absorbe aussi bien les sons qu&rsquo;un mur antibruit de 4 me\u0300tres d&rsquo;e\u0301paisseur.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/djibouti\">Djibouti<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Djibouti. Cet article est extrait du mensuel Sciences et Avenir &#8211; La Recherche n\u00b0917-918, date\u0301 juillet-aou\u0302t 2023. Simple, efficace et surtout tre\u0300s compacte, une technologie de\u0301veloppe\u0301e a\u0300 l&rsquo;E\u0301cole polytechnique fe\u0301de\u0301rale de Lausanne (Suisse) apparai\u0302t tre\u0300s prometteuse pour supprimer activement les sons. Ioniser l&rsquo;air pour cre\u0301er une fine couche de plasma antibruit Elle consiste [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":15359,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,49,50],"class_list":["post-15360","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-djibouti","tag-djibouti"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>De l&#039;air ionis\u00e9 comme barri\u00e8re antibruit - Djibouti<\/title>\n<meta name=\"description\" content=\"Cet article est extrait du mensuel Sciences et Avenir - La Recherche n\u00b0917-918, date\u0301 juillet-aou\u0302t 2023. 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