{"id":33218,"date":"1997-06-11T00:00:00","date_gmt":"1997-06-11T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/dinamica-microscopica-de-un-vidrio-fuerte\/"},"modified":"1997-06-11T00:00:00","modified_gmt":"1997-06-11T00:00:00","slug":"dinamica-microscopica-de-un-vidrio-fuerte","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/dinamica-microscopica-de-un-vidrio-fuerte\/","title":{"rendered":"Dinamica microscopica de un vidrio fuerte."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Ricardo Fernandez Perea <\/strong><\/h2>\n<p>La comprensi\u00f3n de los mecanismos microsc\u00f3picos que gobiernan tanto las propiedades estructurales y din\u00e1micas del estado v\u00edtreo es una de las asignaturas pendientes de la f\u00edsica de la materia condensada.  para intentar contribuir al conocimiento de este tipo de materiales, realizamos un estudio con el m\u00e1ximo grado de detalle microsc\u00f3pico posible de un vidrio (el b2o3) arquet\u00edpico, mediante la combinaci\u00f3n de medidas de dispersi\u00f3n de neutrones y simulaciones de din\u00e1mica molecular.  como resultado de este estudio se pudo confirmar:  el claro origen colectivo de la se\u00f1al inelastica conocida como pico \u00abbos\u00f3nico\u00bb.  que la mayor parte del desplazamiento cuadr\u00e1tico medio en estos materiales tiene su origen en inestabilidades estructurales de agrupaciones de unos pocos \u00e1tomos.  la necesidad de tener en cuenta t\u00e9rminos anarm\u00f3nicos al analizar estos materiales debiendo siempre considerar la aproximaci\u00f3n arm\u00f3nica como una primera aproximaci\u00f3n, teniendo siempre que comprobar su validez.  la presencia de ensanchamiento cuasiel\u00e1stico bien por debajo de la transici\u00f3n v\u00edtrea.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Dinamica microscopica de un vidrio fuerte.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Dinamica microscopica de un vidrio fuerte. <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Ricardo Fernandez Perea <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Aut\u00f3noma de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 06\/11\/1997<\/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>Francisco Javier Bermejo Barrera<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: sebasti\u00e1n Vieira d\u00edaz <\/li>\n<li>gabriel Cuello zabala (vocal)<\/li>\n<li>elvira Guardia manuel (vocal)<\/li>\n<li>Alberto Criado vega (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Ricardo Fernandez Perea La comprensi\u00f3n de los mecanismos microsc\u00f3picos que gobiernan tanto las propiedades estructurales y din\u00e1micas [&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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