988 resultados para stoneware tiles
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Se hace un repaso de las características fundamentales de la sociedad de la segunda mitad del siglo XVIII español, momento en el que se producen una serie de innovaciones educativas, y que inciden en la cuestión de cuáles fueron las políticas educativas que los ilustrados forjaron para los hijos de las clases populares. También se realiza un estudio sobre el lugar que ocupa la educación popular en el interior de proyectos representativos de las Luces. Y por último, se hace una aproximación a las diferentes prácticas de la instrucción elemental.
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El tutor o tutora es la persona encargada de: conocer al grupo del que es tutor; conocer individualmente a cada alumno que forma parte del grupo; coordinar las evaluaciones; hablar con los padres y madres de la evolución del alumno; mantener contacto con el resto de los profesores; actuar como profesor de diversas materias. Se analizan los diversos aspectos que debe contener un Programa de Acción Tutorial, estos deben ser: conocimiento del grupo y de los miembros que lo formen; educación moral; técnicas de trabajo intelectual; orientación; participación del alumnado; vida en la escuela.
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Serie documental en la que se analizan plantas, fundamentalmente situadas en zonas del Tercer Mundo, su valor y utilidad para los seres humanos, por ejemplo, el arroz, o la soja, y la moderna tecnología que debería ser transferida a estos países para un mayor aprovechamiento de la tierra.
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Programa emitido el 13 de octubre de 1995
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Programa emitido el 27 de octubre de 1995
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Se trata de una guía ilustrada de los principales útiles prehistóricos, considerada imprescindible para todo aquel que quiera aproximarse al estudio de esta etapa. Pretende servir de apoyo al profesorado de Enseñanza Secundaria, así como al alumno universitario, que en los estudios de Geografía e Historia se acerca al estudio más en profundidad de una disciplina como la prehistoria. En los Ciclos de Enseñanza Secundaria Obligatoria, de 12 a 14 años y de 14 a 16 años, se incluye el área de Ciencias Sociales, Geografía e Historia y dentro de ésta se incluye el concepto de las sociedades prehistóricas uno de cuyos bloques de contenidos es el de: Sociedades Históricas..
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Resumen tomado de la publicación. - El artículo pertenece a una sección monográfica de la revista dedicada a Patrimonio y educación
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El artículo forma parte de un monográfico dedicado a Internet en la enseñanza de la Historia
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El artículo forma parte de un monográfico de la revista dedicado a orientación y medios de comunicación
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Resumen tomado de la publicaci??n
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The objective of the present work was to evaluate the effects of 14 years of weathering exposition on the microstructure and mineral composition of cementitious roofing tiles, still in service, reinforced with fique fibres (Furcrae gender). The results show that tiles under weathering exposition presented higher water absorption and apparent void volume than tiles under laboratory exposition. The continuous hydration of cement and natural carbonation filled the smaller pores but contrarily the large pores remained in the porous fibre to matrix interface in the samples exposed to weathering. On the other hand, their microstructure presented lower air permeability than samples aged in the internal environment of the laboratory. Besides, in the weathering aged tiles takes place a more intensive hydration process as it was identified greater amount of hydrated phases than in the laboratory aged specimens. The present results contribute to understanding the consequences of tropical weathering on the fibre-cement degradation. (C) 2010 Elsevier Ltd. All rights reserved.
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The present work evaluated the effects of accelerated carbonation on mechanical and physical characteristics of cementitious roofing tiles reinforced with vegetable fibre. The maximum load and toughness of the tiles have increased approximately 25% and 80% respectively as a consequence of the accelerated carbonation. Water absorption and apparent porosity decreased with carbonation while bulk density increased as a clear indication of the densification of the composite. The improvement on the mechanical performance suggests that the fibres retained their tensile strength in the inorganic matrix. Results of specimens extracted from the tested tiles after approximately 480 days in laboratory environment and further aged indicate that soak and dry cycles promoted some leaching of hydration products and more voids and lower density when performed before carbonation. The results indicate the utilization of accelerated carbonation as an effective procedure to mitigate the degradation suffered by the cellulose fibres in the less aggressive medium. (C) 2009 Elsevier Ltd. All rights reserved.
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This study aimed at evaluating the thermal performance of a modular ceiling system for poultry houses. The reduced- and distorted-scale prototypes used ceiling modules made of reforested wood and were covered with recycled long-life package tiles. The following parameters were measured for 21 days: the internal surface temperature (ST), globe temperature and humidity index (WBGT), and radiant heat load (RHL). Measurements were made at times of highest heat load (11:00 am, 13:00 pm, and 03:00 pm). Collected data were analyzed by ""R"" statistics software. Means were compared by multiple comparison test (Tukey) and linear regression was performed, both at 5% significance level. The results showed that the prototype with the ceiling was more efficient to reduce internal tile surface temperature; however, this was not sufficient to provide a comfortable environment for broilers during the growout. Therefore, other techniques to provide proper cooling are required in addition to the ceiling
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The objective of this work was to analyze mechanical, physical and thermal performance of roofing tiles produced with several formulations of cement-based matrices reinforced with sisal and eucalyptus fibers. The physical properties of the tiles were more influenced by the fiber content of the composite than by the type of reinforcement. The type of the fiber was the main variable for the achievement of the best results of mechanical properties. Exposure to tropical climate has caused a severe reduction in the mechanical properties of the composites. After approximately four months of age under external weathering the toughness of the vegetable fiber-cement fell to 53-68% of the initial toughness at 28 days of age. The thermal performance showed that roofing tiles reinforced with vegetable fiber are acceptable as substitutes of asbestos-cement sheets. (c) 2006 Elsevier Ltd. All rights reserved.