880 resultados para Pérez de Barcia, Domingo


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Sign.: [calderón]-[dos calderones]4,[ ]1, A-Z4, Aa-Zz4,Aaa-Zzz4, Aaaa-Zzzz4, Aaaaa-Ccccc4

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This paper shows the results of the study of physical, mechanic and chemical behaviour of some natural zeolite types sampled in different outcrops of the world, mainly from Mexico, Cuba and Spain, as well as their incidence in certain practical applications, by means of the utilization of its pozzuolanic properties. Results emphasize that every natural zeolite variety gives different answers in the assays, probably influenced by the subtle variability of their chemical composition. Key words: zeolites, pozzuolanic, density, geometric, strength

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Pérez Pita y Junquera, a la manera de Corrales y Molezún, es uno de los equipos más prestigiosos de su generación.

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In Spain, natural zeolites have been only found in the volcanic areas of Canary Islands (San Gil, M.M., 1959). However, several years ago the study of the South Eastern region of continental Spain (Cabo de Gata) revealed the presence of a deposit of mordenite being industrially commercialized as bentonite. The deposit San José-Los Escullos is located in the concession registered as Los Murcianos, managed by Bentonitas Especiales, S.A. (BENESA) who was extracting bentonite while ignoring the presence of the zeolite. The name San José-Los Escullos refers to the discovery of mordenite in this deposit. The deposit is located in a volcanic area, constituted by pyroxenic andesites, breccias, tuffs, pyroclasts with andesitic and dacitic composition, largely altered by the hydrothermal solutions. The recent discovery of this zeolite with mordenite content up to 97%, has changed the initial vision about that deposit, and new possible uses of this mineral in the pozzolanic cement industry are foreseen. This work intends to give preliminary data on the characterization of this zeolite according to X-ray diffraction (XRD), ICP analyses, and scanning electron microscopy (SEM), as well as to emphasize the pozzolanic properties of this material, using both chemical and mechanical tests.

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Alcance y contenido: El convento dominico de Castellón de Játiva, hace referencia al nombre por el que se conocía antíguamente a la población de Castellón de la Ribera (Villanueva de Castellón).

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En el verso de la h. aparece nota manuscrita del propio Manuel Peleguer acerca de la compra de acero para "hacer cuños o troqueles" para fabricar monedas y la búsqueda de obras impresas que traten sobre el modo de fabricar o grabar monedas

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Artículo de opinión sobre Tanis Pérez Pita, publicado en El País