665 resultados para Cono de escoria


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[EN]Due to the limitations associated with fossil fuels it is necessary to promote energy sources that are renewable as well as eco-friendly, such as biogas generated in anaerobic digesters. The biogas, composed principally of methane and CO2, is the result of the biodegradation of organic matter under anaerobic conditions. Its use as fuel is limited by the presence of minority compounds such as hydrogen sulphide (H2S); therefore, its pre-treatment is necessary. Currently there are various technologies for the removal of H2S from a gas stream, but most of them are based on physic-chemical treatments which have a number of drawbacks as reactive consumption, generation of secondary flows, etc. Biofiltration has been used as an efficient and low cost alternative to conventional purification processes, and excellent results for the degradation of H2S have been obtained. However process can be limited due to the progressive ageing of the support material, along with the loss of nutrients and other specific characteristics necessary for the good development of biomass. The purpose of this project is to develop a mixed support consisting of a mixture of an organic material and an inorganic support for its application in the removal of the H2S from biogas. This support material helps to optimize the characteristics of the bed and extend its lifespan. The development of such material will contribute to the implementation of biofiltration for treating biogas from anaerobic digesters for its use as biofuel. The inorganic material used is electric arc furnace (EAF) black slag, a by-product generated in large quantities in the production of steel in the Basque Country. Although traditionally the slag has been used in civil engineering, its physicochemical characteristics make it suitable for reuse as a filter medium in biofiltration. The main conclusion drawn from the experimental results is that EAF black slag is a suitable co-packing material in organic biofilters treating H2S-polluted gaseous streams. High pollutant removal rates have been achieved during the whole experimental period. The removal capacity recorded in biofilters with less inorganic material was higher than in those with higher slag portion. Nevertheless, all the biofilters have shown a satisfactory response even at high inlet loads (48 g·m-3·h-1), where the RE has not decreased over 82%.

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5 hojas.

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A menudo se piensa que en las Matemáticas no 69 hay lugar para el ensayo y el error, propagando la idea de que gran parte de la labor del matemático es tener la ocurrencia apropiada. En este artículo mostramos dos problemas que, aunque aparentemente deberían resolverse usando la misma idea, son resueltos sin justificación alguna en los libros de texto utilizando ideas diferentes. Además, presentamos otra situación mucho más próxima al estudiante con la misma dificultad subyacente y que sirve para explicar dicha dificultad de un modo más adecuado al nivel del alumno.

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Tesis (Maestría en Ciencias de la Ingeniería Mecánica con Orientación en Procesos Sustentables) UANL, 2011.

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Tesis (Maestría en Ciencias de la Ingeniería Mecánica con Especialidad en Materiales) UANL, 2012.

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Tesis (Maestría en Ciencias de la Ingeniería Mecánica con Especialidad en Materiales) UANL, 2011.

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Tesis (Maestría en Ciencias con orientación en Ingeniería Ambiental) UANL, 2014.

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El Tratado de Asunción influye sobre las dinámicas migratorias del Cono Sur, y en especial de Argentina. Pues genera unas condiciones económicas especiales en el Cono Sur, que sumadas a los instrumentos institucionales, influyen a su vez jurídicamente, lo que refuerza la migración interregional al País Austral.

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El objetivo principal de esta monografía es responder a las razones por las cuales la Iglesia católica1 y, en general, su Cristianismo de abolengo grecorromano, aún frente a la acerba crítica protestante por el culto a las imágenes -particularmente al ícono-, continuó conservando en sus prácticas religiosas este objeto de culto. En un plano particular, intenta aclarar los acontecimientos históricos que evidencian desde los primeros siglos de la historia cristiana una tendencia general a la representación pictórica de Dios. Asimismo, es una aguda búsqueda de las razones que integran las manifestaciones tangibles de tal concepto.

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El artículo pertenece al monográfico de la revista dedicado a: La televisión y sus nuevas expresiones