{"id":110902,"date":"2018-03-11T10:37:09","date_gmt":"2018-03-11T10:37:09","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/modelizacion-de-la-transicion-va%c2%adtrea-con-relajacion-entalpica-a-partir-de-datos-termicos\/"},"modified":"2018-03-11T10:37:09","modified_gmt":"2018-03-11T10:37:09","slug":"modelizacion-de-la-transicion-va%c2%adtrea-con-relajacion-entalpica-a-partir-de-datos-termicos","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/estados-no-cristalinos\/modelizacion-de-la-transicion-va%c2%adtrea-con-relajacion-entalpica-a-partir-de-datos-termicos\/","title":{"rendered":"Modelizaci\u00f3n de la transici\u00f3n v\u00edtrea con relajaci\u00f3n ent\u00e1lpica a partir de datos t\u00e9rmicos"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Jorge  Jos\u00e9 L\u00f3pez Beceiro <\/strong><\/h2>\n<p>El objetivo de este trabajo es modelizar la curva de flujo de calor total que se obtiene a partir de ensayos de calorimetr\u00eda diferencial de barrido (dsc) est\u00e1ndar en el rango de temperaturas de la transici\u00f3n v\u00edtrea y la recuperaci\u00f3n ent\u00e1lpica. Para ello se propone un modelo matem\u00e1tico que permite la estimaci\u00f3n de las curvas de flujo de calor reversing y nonreversing (se utiliza la denominaci\u00f3n inglesa para evitar la confusi\u00f3n con procesos termodin\u00e1micamente reversibles o irreversibles) a partir de la curva de flujo de calor total obtenida en un ensayo de calorimetr\u00eda diferencial de barrido. El modelo se ajusta de forma \u00f3ptima a la curva de flujo de calor total mediante t\u00e9cnicas de regresi\u00f3n no lineal. An\u00e1logamente al mtdsc, el modelo propuesto permite separar los procesos reversing y nonreversing, pero con la diferencia importante de que al trabajar con datos de flujo de calor total, las se\u00f1ales separadas no se ver\u00e1n afectadas por la frecuencia de modulaci\u00f3n. Teniendo en cuenta estas diferencias, la separaci\u00f3n obtenida con el modelo se compara con la obtenida mediante mtdsc y se obtiene una estimaci\u00f3n del efecto de la frecuencia. La posibilidad de aplicar este modelo resulta de especial inter\u00e9s en el estudio del envejecimiento f\u00edsico de materiales amorfos o parcialmente amorfos, los cuales al ser almacenados a temperaturas inferiores a su temperatura de transici\u00f3n v\u00edtrea, evolucionan espont\u00e1neamente hacia un estado de equilibrio experimentando lo que se conoce como relajaci\u00f3n ent\u00e1lpica. En esas situaciones, el estudio de la transici\u00f3n v\u00edtrea mediante dsc est\u00e1ndar es muy complicado, a no ser que se borre previamente la historia t\u00e9rmica, lo cual alterar\u00eda el material. Conviene destacar que la importancia del modelo no radica en poder obtener mediante dsc est\u00e1ndar algo similar a lo que se obtiene mediante mtdsc, sino en que la estimaci\u00f3n de la temperatura de transici\u00f3n v\u00edtrea obtenida est\u00e1 libre, a diferencia del caso mtdsc, del efecto de la frecuencia.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Modelizaci\u00f3n de la transici\u00f3n v\u00edtrea con relajaci\u00f3n ent\u00e1lpica a partir de datos t\u00e9rmicos<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Modelizaci\u00f3n de la transici\u00f3n v\u00edtrea con relajaci\u00f3n ent\u00e1lpica a partir de datos t\u00e9rmicos <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Jorge  Jos\u00e9 L\u00f3pez Beceiro <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 A coru\u00f1a<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 16\/09\/2011<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Ramon Pedro Artiaga Diaz<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Jos\u00e9 Mar\u00eda Gomez de salazar caso de los cobos <\/li>\n<li>Juan Baselga llido (vocal)<\/li>\n<li>Jos\u00e9 Pascual cosp (vocal)<\/li>\n<li>Carlos Alberto Gracia fern\u00e1ndez (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Jorge Jos\u00e9 L\u00f3pez Beceiro El objetivo de este trabajo es modelizar la curva de flujo de calor [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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