{"id":7888,"date":"2024-11-12T00:51:17","date_gmt":"2024-11-12T00:51:17","guid":{"rendered":"https:\/\/masacousticspro.com\/?p=7888"},"modified":"2025-11-27T14:17:26","modified_gmt":"2025-11-27T14:17:26","slug":"per-a-que-serveixen-les-barreres-acustiques-i-on-sapliquen","status":"publish","type":"post","link":"https:\/\/masacousticspro.com\/ca\/per-a-que-serveixen-les-barreres-acustiques-i-on-sapliquen\/","title":{"rendered":"Per a qu\u00e8 serveixen les barreres ac\u00fastiques i on s\u2019apliquen?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"7888\" class=\"elementor elementor-7888 elementor-7858\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-14d45f8 elementor-section-boxed elementor-section-height-default elementor-section-height-default gs-locked-section-no\" data-id=\"14d45f8\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-0aded4e\" data-id=\"0aded4e\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-7221ad4 elementor-widget elementor-widget-text-editor\" data-id=\"7221ad4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p dir=\"ltr\" style=\"line-height: 1.2; margin-top: 0pt; margin-bottom: 0pt;\"><span style=\"font-weight: 400;\">Les barreres ac\u00fastiques s\u00f3n elements essencials en la mitigaci\u00f3 del soroll ambiental i protegir, tant la salut p\u00fablica com el benestar general. A continuaci\u00f3, explorarem en detall qu\u00e8 s\u00f3n aquestes barreres ac\u00fastiques, els tipus disponibles, els seus avantatges i les principals aplicacions en diversos contextos. A llegir!<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-e12c945 elementor-section-boxed elementor-section-height-default elementor-section-height-default gs-locked-section-no\" data-id=\"e12c945\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-837c232\" data-id=\"837c232\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-ee2dbaf elementor-widget elementor-widget-text-editor\" data-id=\"ee2dbaf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p dir=\"ltr\" style=\"line-height: 1.2; text-align: center; margin-top: 0pt; margin-bottom: 0pt;\"><span style=\"font-size: 12pt; font-family: Arial,sans-serif; color: #000000; background-color: transparent; font-weight: 400; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;\"><span style=\"border: none; display: inline-block; overflow: hidden; width: 541px; height: 344px;\"><img fetchpriority=\"high\" decoding=\"async\" style=\"margin-left: 0px; margin-top: 0px;\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXeJ_CjhvnoigyvarWdjm-VsiSd-Oy8l5pfRyAVbJS-e9kxIzXx4PxrPtL8fcVZQAPIIS2Bf2wbi85foGjXRMKN1CQ2CwAPKXlS9j0JVFRMAoGXi31WkaN916CuZIqIrGRnGECGB2YOmDveOSemQIQfgdbRE?key=XvL5of36ZiqfXQKui7qDsA\" width=\"541\" height=\"344\" \/><\/span><\/span><\/p><p dir=\"ltr\" style=\"line-height: 1.2; text-align: center; margin-top: 0pt; margin-bottom: 0pt;\"><span style=\"font-size: 9pt; font-family: Arial,sans-serif; color: #434343; background-color: transparent; font-weight: bold; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;\">Exemple de barrera ac\u00fastica amb <\/span><a style=\"text-decoration: none;\" href=\"https:\/\/masacoustics.com\/193-panel-absorbente-stratocell-whisper-fr.html\"><span style=\"font-size: 9pt; font-family: Arial,sans-serif; color: #1155cc; background-color: transparent; font-weight: bold; font-style: normal; font-variant: normal; text-decoration: underline; -webkit-text-decoration-skip: none; text-decoration-skip-ink: none; vertical-align: baseline; white-space: pre-wrap;\">panell absorbent Stratocell Whisper<\/span><\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-d401fc5 elementor-section-boxed elementor-section-height-default elementor-section-height-default gs-locked-section-no\" data-id=\"d401fc5\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-73f26e9\" data-id=\"73f26e9\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-70ca317 elementor-widget elementor-widget-text-editor\" data-id=\"70ca317\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2><span style=\"font-weight: 400;\">Qu\u00e8 s\u00f3n les barreres ac\u00fastiques?<\/span><\/h2><p><span style=\"font-weight: 400;\">Les <\/span><b>barreres<\/b><span style=\"font-weight: 400;\"> o <\/span><b>pantalles ac\u00fastiques<\/b><span style=\"font-weight: 400;\"> s\u00f3n dispositius dissenyats per a interrompre la propagaci\u00f3 de les ones sonores entre una font de so i un receptor. Com que estan convenientment dimensionades i ubicades, aquestes barreres creen una \u201c<\/span><b>ombra ac\u00fastica<\/b><span style=\"font-weight: 400;\">\u201d, que redueix significativament el nivell de so percebut. Aquest efecte s\u2019aconsegueix mitjan\u00e7ant la <\/span><b>difracci\u00f3 de les ones sonores<\/b><span style=\"font-weight: 400;\"> als costats de la barrera, segons el <\/span><a href=\"https:\/\/es.wikipedia.org\/wiki\/Principio_de_Fresnel_-_Huygens\"><span style=\"font-weight: 400;\">principi de Fresnel-Huygens<\/span><\/a><span style=\"font-weight: 400;\">, segons el qual la magnitud de l\u2019efecte dep\u00e8n de la relaci\u00f3 entre la longitud d&#8217;ona i la grand\u00e0ria de l\u2019obstacle.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-bdd4aa7 elementor-section-boxed elementor-section-height-default elementor-section-height-default gs-locked-section-no\" data-id=\"bdd4aa7\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-923629c\" data-id=\"923629c\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-f8d1c62 elementor-widget elementor-widget-text-editor\" data-id=\"f8d1c62\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2><span style=\"font-weight: 400;\">Tipus de barreres ac\u00fastiques<\/span><\/h2><p><span style=\"font-weight: 400;\">Existeixen diversos tipus de barreres ac\u00fastiques, cadascuna amb caracter\u00edstiques i aplicacions espec\u00edfiques.<\/span><\/p><h3><span style=\"font-weight: 400;\">Barreres ac\u00fastiques reflectants o difractives<\/span><\/h3><p><span style=\"font-weight: 400;\">Poden ser rectes o inclinades, depenent de la dist\u00e0ncia i l\u2019al\u00e7ada de les zones a protegir. Aquestes barreres estan dissenyades per a protegir \u00e0rees sensibles al so general del tr\u00e0nsit de carreteres, autopistes o ferrocarrils. Funcionen canalitzant el so cap a un o ambd\u00f3s costats, i poden ser opaques, transl\u00facides o transparents<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-e0ea04c elementor-section-boxed elementor-section-height-default elementor-section-height-default gs-locked-section-no\" data-id=\"e0ea04c\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-fb280cb\" data-id=\"fb280cb\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-4f319bf elementor-widget elementor-widget-image\" data-id=\"4f319bf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"522\" height=\"560\" src=\"https:\/\/masacousticspro.com\/wp-content\/uploads\/2024\/11\/6-imatges.jpg\" class=\"attachment-large size-large wp-image-7860\" alt=\"\" srcset=\"https:\/\/masacousticspro.com\/wp-content\/uploads\/2024\/11\/6-imatges.jpg 522w, https:\/\/masacousticspro.com\/wp-content\/uploads\/2024\/11\/6-imatges-280x300.jpg 280w\" sizes=\"(max-width: 522px) 100vw, 522px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Imatges de \u201cPag 30-Pic2-Manual_Barrera_Acustica_Final-Pinedo Rodr\u00edguez\u201d<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-647a0f9 elementor-widget elementor-widget-text-editor\" data-id=\"647a0f9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3><span style=\"font-weight: 400;\"><br \/>Barreres ac\u00fastiques absorbents<\/span><\/h3><p><span style=\"font-weight: 400;\">Utilitzades principalment per a la ind\u00fastria, aquestes barreres ajuden a reduir el nivell de so, tant dins com fora de les instal\u00b7lacions. Generalment combinen materials absorbents i xapes perforades. S\u00f3n comuns en motors, torres d\u2019aire condicionat i estructures industrials, i poden ser instal\u00b7lades en interiors o exteriors, fixes o m\u00f2bils.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e665691 elementor-widget elementor-widget-image\" data-id=\"e665691\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"514\" height=\"417\" src=\"https:\/\/masacousticspro.com\/wp-content\/uploads\/2024\/11\/4-imatges.jpg\" class=\"attachment-large size-large wp-image-7864\" alt=\"\" srcset=\"https:\/\/masacousticspro.com\/wp-content\/uploads\/2024\/11\/4-imatges.jpg 514w, https:\/\/masacousticspro.com\/wp-content\/uploads\/2024\/11\/4-imatges-300x243.jpg 300w\" sizes=\"(max-width: 514px) 100vw, 514px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-45bb2a1 elementor-widget elementor-widget-text-editor\" data-id=\"45bb2a1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3><br \/><span style=\"font-weight: 400;\">Materials comuns<\/span><\/h3><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Met\u00e0l\u00b7liques:<\/b><span style=\"font-weight: 400;\"> Ofereixen durabilitat i efectivitat en la reflexi\u00f3 del so.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Transparents (pl\u00e0stic o vidre):<\/b><span style=\"font-weight: 400;\"> Permeten la visibilitat mentre bloquegen el so.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Formig\u00f3<\/b><span style=\"font-weight: 400;\">: Molt efectives en l\u2019absorci\u00f3 i la difracci\u00f3 del so.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Fusta<\/b><span style=\"font-weight: 400;\">: Utilitzades en aplicacions est\u00e8tiques i ambientals.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Vegetals<\/b><span style=\"font-weight: 400;\">: Integren solucions ecol\u00f2giques amb paisatgisme.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Combinacions<\/b><span style=\"font-weight: 400;\">: Sovint s\u2019utilitzen combinacions d\u2019aquests materials per a optimitzar caracter\u00edstiques ac\u00fastiques i est\u00e8tiques.<\/span><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2eb5cc6 elementor-widget elementor-widget-image\" data-id=\"2eb5cc6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"524\" height=\"364\" src=\"https:\/\/masacousticspro.com\/wp-content\/uploads\/2024\/11\/4-imatges-2.jpg\" class=\"attachment-large size-large wp-image-7868\" alt=\"\" srcset=\"https:\/\/masacousticspro.com\/wp-content\/uploads\/2024\/11\/4-imatges-2.jpg 524w, https:\/\/masacousticspro.com\/wp-content\/uploads\/2024\/11\/4-imatges-2-300x208.jpg 300w\" sizes=\"(max-width: 524px) 100vw, 524px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Imatges de \u201cPag 30-Pic2-Manual_Barrera_Acustica_Final-Pinedo Rodr\u00edguez<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-79fb4c5 elementor-widget elementor-widget-text-editor\" data-id=\"79fb4c5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2>\u00a0<\/h2><h2><span style=\"font-weight: 400;\">Avantatges de les barreres ac\u00fastiques<\/span><\/h2><p><span style=\"font-weight: 400;\">Les barreres ac\u00fastiques ofereixen m\u00faltiples beneficis que contribueixen a la millora de l\u2019entorn sonor.<\/span><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Reducci\u00f3 del soroll ambiental:<\/b><span style=\"font-weight: 400;\"> Disminueixen el nivell de so produ\u00eft pel tr\u00e0nsit, els transports i la ind\u00fastria, protegint aix\u00ed vides i centres de treball, educatius i sanitaris.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Compliment normatiu:<\/b><span style=\"font-weight: 400;\"> Limiten l\u2019acc\u00e9s a \u00e0rees on el soroll supera els l\u00edmits establerts per normatives ambientals i de salut laboral.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Millora la qualitat de vida:<\/b><span style=\"font-weight: 400;\"> Redueixen la contaminaci\u00f3 ac\u00fastica, permetent aix\u00ed que les activitats quotidianes es duguin a terme sense afectacions a la salut.<\/span><\/li><\/ul><h2><span style=\"font-weight: 400;\">Principals aplicacions de les barreres ac\u00fastiques<\/span><\/h2><p><span style=\"font-weight: 400;\">Les barreres ac\u00fastiques s\u2019apliquen en diverses \u00e0rees per a controlar i mitigar el soroll.<\/span><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Infraestructures de transport:<\/b><span style=\"font-weight: 400;\"> Carreteres, autopistes i l\u00ednies ferrovi\u00e0ries utilitzen barreres ac\u00fastiques per a protegir les zones residencials i comercials properes.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Ind\u00fastria:<\/b><span style=\"font-weight: 400;\"> En instal\u00b7lacions industrials, aquestes barreres s\u00f3n crucials per a controlar el so de la maquin\u00e0ria pesada, motors i sistemes de ventilaci\u00f3.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Edificis i construccions:<\/b><span style=\"font-weight: 400;\"> S\u2019utilitzen per a protegir edificis sensibles, com hospitals, escoles i oficines de la contaminaci\u00f3 ac\u00fastica exterior.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Zones residencials i comercials:<\/b><span style=\"font-weight: 400;\"> Milloren la qualitat de vida en \u00e0rees urbanes densament poblades.<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">A Mas Acoustics som especialistes en condicionament ac\u00fastic i oferim assessorament personalitzat per a identificar i mitigar problemes d\u2019ac\u00fastica. Comptem amb un <\/span><a href=\"https:\/\/masacousticspro.com\/proyectos\/\"><span style=\"font-weight: 400;\">portafoli<\/span><\/a><span style=\"font-weight: 400;\"> divers que inclou barreres ac\u00fastiques d\u2019\u00faltima generaci\u00f3 i ens comprometem a millorar la qualitat del so dels nostres clients. <a href=\"https:\/\/masacousticspro.com\/contacto\/\">Contacta amb nosaltres<\/a> per a descobrir com podem ajudar-te.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Les barreres ac\u00fastiques s\u00f3n elements essencials en la mitigaci\u00f3 del soroll ambiental i protegir, tant la salut p\u00fablica com el benestar general. A&#8230;<\/p>\n","protected":false},"author":2,"featured_media":11573,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[110,116],"tags":[],"class_list":["post-7888","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-estrategias-de-acondicionamiento-acustico","category-estrategies-de-condicionament-acustic"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Per a qu\u00e8 serveixen les barreres ac\u00fastiques i on s\u2019apliquen? - Masacousticspro<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/masacousticspro.com\/ca\/per-a-que-serveixen-les-barreres-acustiques-i-on-sapliquen\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Per a qu\u00e8 serveixen les barreres ac\u00fastiques i on s\u2019apliquen? - Masacousticspro\" \/>\n<meta property=\"og:description\" content=\"Les barreres ac\u00fastiques s\u00f3n elements essencials en la mitigaci\u00f3 del soroll ambiental i protegir, tant la salut p\u00fablica com el benestar general. 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